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Патент USA US3036443

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May 29, 1962
R. L. I_OUP
3,036,433
HYDRAULIC POWER UNIT
Filed Aug. 3l, 1959
5 Sheets-Sheet 1 `
May 29, 1962
R. |_. LOUP
3,036,433
HYDRAULIC POWER UNIT
Filed Aug'. 5l. 1959
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May 29, 1962 '
R. |_. LOUP
3,036,433
HYDRAULIC POWER UNIT
Filed Aug. 3l. 1959
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May 29, 1962
R. L. I_oUP
3,036,433
HYDRAULIC POWER UNIT
Filed Aug. 3l. 1959
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INVENTOR.
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May 29, 1962
R. |_. LOUP
' 3,036,433
HYDRAULIC POWER UNIT
Filed Aug. 3l, 1959
5 Sheets-Sheet 5
...LL-C.
INVENTUR.
FÚWJZJ A ¿az/ff I
United States Patent O ice
1
3,936,433
HYDRAULIC PGWER UNIT
Ronald L. Loup, Manchester, Mich., assignor to Double A
Products Company, Manchester, Mich., a corporation
of Michigan
Filed Aug. 31, 1959, Ser. No. 837,079
9 Claims. (Cl. 60-52)
This invention relates to hydraulic power units and
particularly to a small compact hydraulic power unit that
can have a plurality of directional valves mounted di
rectlyithereon in a manner to eliminate the need for eX
ternal piping connections to the valves.
It is one object of the present invention to provide a
small compact hydraulic power unit having one or more
directional valves mounted directly thereon without any
external piping connections and wherein each valve is in
a series pressure supply connection which establishes a
3,036,433
Patented May 29, 1,962
2
a hydraulic press, the hydraulic power unit being greatly
enlarged relative to the size of the press for purposes of
clarity;
FIG. 2 is a perspective view of the hydraulic power
unit of FIG. 1 connected to a hydraulic jack, the hydraulic
power unit being enlarged relative to the hydraulic jack
and the truck on which the jack is being used as in FIG.
l for purposes of clarity;
FIG. 3 is a perspective view of a hydraulic power unit
embodying features of the present invention having four
directional valves mounted thereon for operating four sep
arate double-acting hydraulic cylinders;
FIG. 4 is a schematic circuit diagram of a hydraulic
power unit embodying features of the present invention
having two directional valves mounted directly thereon;
FIG. 5 is an elevational view, partially broken away, of
a hydraulic power unit embodying features of the pres
ent invention having one directional Valve mounted di
rectly thereon;
priority system of operation so that the supply of pres
FIG. 6 is a View similar to that of FIG. 5 illustrating a
surized fluid is blocked to all valves farther down the cir 20
hydraulic power unit having four directional valves
cuit when any valve in the series is shifted.
mounted directly thereon;
It is another object of the invention to provide a hy
FIG. 7 is a plan view of the hydraulic power unit illus
draulic power unit having directional valves mounted
trated in FIG. 6;
thereon in the above described manner wherein additional
valves may Ibe added directly to the power unit by the 25 FIG. 8 is an enlarged sectional view of the structure
illustrated in FIG. 5, taken along the line 8-8 Athereof
user without disturbing the piping connections to the hy
with a portion of the directional valve shown in section;
draulic device being controlled by each valve.
FIG. 9 is an enlarged sectional view of the structure il»
It is a further object of the invention to provide a hy
lustrated in FIG. 5, taken along the line 9_9 thereof;
draulic power unit having directional valves mounted di
FIG. 10 is an enlarged sectional view of the structure
rectly thereon in the above described manner and having 30
illustrated in FIG. 5, taken along the line 10-10 thereof;
a built-in relief valve that provides a safety factor in op
FIG. 11 is an enlarged sectional view of the structure
erating positions of the spools of the directional valves.
illustrated in FIG. 5, taken along the line 11--11 thereof;
It is a still further object of the invention to provide
FIG. 12 is an enlarged sectional view of the structure
a hydraulic power unit having directional valves mounted
directly thereon as described above wherein overheating 35 illustrated in FIG. 5, taken along the line 12-12 thereof;
FIG. 13 is an enlarged sectional view of the structure
is avoided by free bypass porting through the valve spools
illustrated in FIG. 6, taken along the line 13--13 thereof;
FIG. 14 is an enlarged sectional view of the structure
illustrated in FIG. 6, taken along the line 14-14 thereof;
hydraulic power unit having directional valves mounted
FIG. 15 is an enlarged sectional view of the structure
directly thereon as described above wherein the tank re 40
illustrated in FIG. 6, taken along the line 15-15 thereof;
turn line of each valve is internally ported directly to the
FIG. 16 is an enlarged sectional view of the structure
reservoir of the unit without passing through any other
illustrated in FIG. 5, taken along the line 16-16 thereof
valve to minimize back pressure.
with the pump shaft and oher elements mounted thereon
It is a still further object of the invention to provide
a hydraulic power unit having directional valves mounted
removed;
FIG. 17 is an enlarged sectional view of the structure
directly thereon as described above which is factory as
illustrated in FIG. 5, taken along the line 17-17 thereof
sembled to assure proper iield operation and provide for
with the pump shaft and other elements mounted thereon
lower overall cost as compared to prior art hydraulic
units requiring customized mounting and piping of the
removed;
FIG. 18 is an enlarged sectional view of the structure
valves either at the factory or by the purchaser in the field. 50
illustrated in FIG. 5, taken along'the line 18-18 thereof;
It is a still further object of the invention t0 provide
and
a hydraulic power unit of the type described above hav
FIG. 19 is a fragmentary sectional view of a portion of
ing a heat exchanger cast in the reservoir body thereof to
the manifold block of the hydraulic power unit illustrat
permit connection directly to a water source when it is
ing the built-in relief valve construction.
necessary to cool the hydraulic fluid.
Referring to FIG. l, a hydraulic power unit 24 illus
It is a still further object of the invention to provide a
trating one embodiment of the present invention is dis
compact, completely assembled hydraulic power unit hav
closed which comprises a reservoir body 26 having a
ing directional valves mounted directly thereon as de
cover plate 28 enclosing the open upper end thereof and
scribed above to provide a complete assembly ready to
connect directly to hydraulic cylinder lines of a user’s 60 a ported manifold 30 mounted directly on top of the
in their neutral positions.
It is a still further object of the invention to provide a
cover plate 28. An electric motor 32 is mounted on top
of the manifold block 30 with the output shaft thereof ex
tending through the manifold block to operate >a hydrau
lic pump 142 (FIG. 5) within the reservoir body 26 as
65 will be described in greater detail hereinafter. A direc
versatile, and trouble-free operation.
tional valve 34 operated by electric solenoids 36 and 38
Other objects and features of novelty of the invention
on either end thereof is mounted directly on one side
will be specifically pointed out or otherwise become ap
face of the manifold 30 with suitable internal porting pro
parent when referring, for a better understanding of the
equipment.
It is a still further object of the invention t0 provide a
hydraulic power unit of the type described which is eco
nomical to manufacture, easy to operate and disassemble,
vided therebetween to enable pressurized ñuid to Ypass
invention, to the following description taken in conjunc
70 from the reservoir, through ythe manifold 30», into' the di
tion with the accompanying drawings wherein:
FIG. l is a perspective view of a hydraulic power unit
embodying features of the present invention connected to
rectional valve 34, through the lines 44 and 46 to and
from the press cylinder 4u; back through the manifold
3
3,036,433
and into the reservoir body as will also be described in
greater detail hereinafter.
This construction provides one unitary assembly that
can be connected directly to a double acting hydraulic
cylinder 40 of a hydraulic press 42, for example, by hoses
44 and 46, the hose 44 communicating with one side of
the piston of the hydraulic cylinder 40 and the hose 46
communicating with the other side thereof. The other
ends of the hoses are connected directly to cylinder ports
4
60 is then shifted to operate the hydraulic cylinder '72
to locate the workpiece, the valve 62 shifted to actuate
the hydraulic cylinder 74 vto operate the clamping device,
and finally the valve 64- shifted to actuate the hydraulic
cylinder 76 to operate the welding device, each of the
valves being returned to their neutral position before
actuating the next valve.
Referring to FIG. 4, a schematic diagram of a hydrau
lic power unit having two directional valves mounted
in the manifold 30 as will be described. The directional 10 thereon is illustrated. This would be a unit similar to
valve 34 has no external piping connections and, there
that of FIG. l with the second directional valve mounted
fore, can be easily disassembled for repair or replace
on the opposite side of the manifold 30 from that on
ment. Thus, the user only need concern himself with
which the directional valve 34 is mounted. Such an ar
making the simple hose connections between the mani
rangement is shown in FIG. 5 wherein the valve 34 isv
fold 30 of the hydraulic power unit and the hydraulic cyl 15 illustrated on the left face of the manifold 30 and a
inder 40.
'
second valve is illustrated in phantom as being mounted
Referring to FIG. 2, the hydraulic power unit 24 is
on the right face of the manifold 30.
illustrated as connected to a hydraulic jack 48 by the
As illustrated schematically in FIG. 4 a motor 94 is
vhose 46 having the left end thereof connected to the mani
coupled to a hydraulic pump 96 which pressurizes a pas
fold 30 as previously described. Since the piston of the 20 sageway 98. Of course, the pump 96 obtains its supply
hydraulic jack 48 will automatically lower due to the
of fluid from the reservoir 26 of the hydraulic power
weight of the ramp 52 leading to the truck 54 which it is
supporting, a second hose connection to the upper side
unit which is indicated schematically by connecting the
pump to tank. It is also noted that in each instance
wherein a connection to tank is schematically illustrated
24 is designed to readily compensate for this by merely 25 in FlG. 4, it is to be understood that this is the schematic
connecting the cylinder port of the manifold 30 to which
representation for connection directly back to the reser
the hose 44 is connected to an auxiliary tank port on the
voir 26 of the hydraulic power unit. A relief valve 100
Yopposite side of the manifold block as will be described in
is connected to the passageway 98 to prevent the fluid
greater detail hereinafter.
pressure from exceeding a predetermined value before the
The hydraulic power unit 24 is also designed to have 30 passageway 98 communicates with a three-position direc
one, two, three of four separate directional valves mounted
tional valve 102. When the valve is in its neutral posi
thereon in a very simple building block fashion that en
tion, the pressurized fluid passes directly through the valve
ables individual valves tobe easily added or removed
102 and through a passageway 103 to the second direc
without disturbing any external piping connections from
tional valve 104. When the valve 104 is in its neutral
of the piston is not necessary. The hydraulic power unit
the power unit to the hydraulic device being operated 35 position, as illustrated, the pressurized fluid passes di
thereby. In FIG. 3 the unit 24 is illustrated with four
rectly therethrough and returns to tank through a passage
directional valves 58, 60, 62 and 64 mounted thereon. , way 105. Therefore, the pressurization is very low so as
When four valves are used, adaptor blocks 66 and 68
to require the expenditure of a minimum amount of power
are mounted on opposite side faces of the manifold block
and to generate a minimum amount of heating.
30 as will he described in greater detail hereinafter and
To enable the pressure within the passageway 98 to be
the directional valves are mounted directly on the side
gauged a passageway 106 is connected thereto which, in
and upper faces of the adaptor blocks as illustrated.
the actual hydraulic power unit, communicates with a
With this construction the hydraulic power unit 24 can
gauge port 248 on one of the faces of the manifold 30
operate any one of four separate hydraulic cylinders 70,
as illustrated in FIG. 5 to permit a pressure gauge to be
72, 74 and 76. The hydraulic cylinder 70 is connected 45 inserted therein. Similarly, a passageway 108 is con
directly to two cylinder ports in the manifold 30 by hoses
nected to the passageway 103 to enable the secondary
78 and 80, the hydraulic cylinder 72 is connected directly
pressure therein to he gauged, the passageway 108 corn
to cylinder ports in opposite ends of the adapter Iblockr66
municating with a gauge port 252 as illustrated in FIG. 5.
by hoses 82 and 84, the hydraulic cylinder 74 is connected
A passageway 110V connected to the passageway 98
directly to a second pair of cylinder ports in the manifold 50 provides a second pressure input to the valve '102 which
30 by hoses 90 and 92, and the hydraulic cylinder 76 is
is blocked off when the valve is in its neutral position.
connected directly to cylinder ports in opposite ends of the
Similarly, a passageway 112 provides a second pressure
adaptor block 68 by hoses 86 and 88.
input `for lthe valve 104 which is also blocked off when
As will -be seen from the following description, the in
the valve is in its neutral position. Each valve is provided
ternal porting of the hydraulic power unit 24 and the ele 55 with passageways 114 and 116, respectively, which com
ments mounted thereon connects each of the valves in a
municate the valves with tank and which are both blocked
series ksupply connection which establishes a priority sys
oifV in the neutral position. Passageways 118 and 120
tem of operation so that the pressurized liuid supply is
connect the valve 102 with one vertical pair of cylinder
blocked to all valves farther down the circuit when any
ports in the manifold 30, and passageways 122 and 124
.one valve in the series is shifted. In the typical automa 60 connect the valve 104 with the second pair of cylinder
tion arrangement illustrated in FIG. 3, the valve 58 is
ports in the manifold, `all of which are blockedotî when
the ñrst valve in the series, the valve 60 the second, the
the valves are in their neutral positions.
Valve 62 the third, and the valve 64 the fourth, and each
When the val-ve 102 is shifted to the right by energizing
valve controls the hydraulic cylinders '70, 72, 74 and 76,
respectively. .By way of example, each of the four hy
draulic cylinders illustrated can control separate devices
of an automatic welding machine which are operated in
sequence, such as,l for example, a loading and unloading
the solenoid 126, the `flow of pressurized ñuid through the
65 valve 102 into` the passageway 103 is blocked and the
flow of pressurized fluid from the passageway 110 is
directed into the cylinder passageway 118. At the same
time the cylinder passageway 120 is communicated di
device (hydraulic cylinder 70), a locating device (hy
rectly with tank by the passageway 114 so that the hy
draulic cylinder 72), a toggle or wedge clamping device 70 Vdraulic deviceto which the passageways 118 and 120 are
(hydraulic cylinder 74), and a welding device (hydraulic
connected will be shifted by pressurizing one side thereof
cylinder 76). To begin the operation, the valveV 58 is
with the passageway L18 and connecting the other side
shifted by one of the solenoids on either end thereof to
thereof to tank with the passageway 120.
actuate the hydraulic cylinder 70 to load the workpiece
With the valve 102 shifted in this direction, it is ap
and, thereafter, return to its neutral position. The valve
parent that shifting of the valve 104 can only connect
3,036,433
5
one or the other of passageways 122 and 124 with tank
and that no pressurized iluid could be introduced thereto
since the passageway 103 is blocked oif by the valve 102.
Similarly, shifting the valve 102 to the left by energizing
the electric solenoid 128 would also prevent the pressur
ized fluid 4from passing from the passageway 98 through
the valve and into the passageway 103. However, in this
extreme left hand position the passageway 110 is com
municated with the passageway 120 and the passageway
118 is communicated directly with tank through the pas
sageway 114. In this position, the hydraulic device con
trolled by passageways 118 and 120 would be reversed.
When both solenoids 126 and 128 are deenergized the
valve 102 is returned to its neutral position and again
seals off both of the passageways 118 and 120 and per
mits the pressurized ñuid to pass therethrough and
through the Valve 104 to tank through the passageway
6
side of the cover plate 28 by Ibolts i168 with an operating
shaft therefore extending upwardly through the central
apertures 166 and 164 to the connector 144 (FIG. 5).
Bolts 172 are also provided for bolting the cover plate 28
to the reservoir body 26, and apertures 174 and 176 are
provided at opposite ends of the cover plate 28. A ñller
cap 177 (illustrated in FIG. 5) is mounted on the cover
‘plate 28 and ñts within a notch 178 in the cover plate 30
to enable the reservoir to be iilled through the `aperture
10 174, and a breather filter 180 (illustrated in FIG. 6) is
mounted on the cover plate 28 above the aperture 176
and tits within a semicircular notch 182 of the mani
fold 30.
The port patterns of the mating faces of the manifold
15 30 and the directional valve 34 are illustrated in FIGS.
ll and l2.
The face 183 of the manifold 30, as illus
trated in FIG. l2, has a pressure port 184, tank port 186,
a drain port 188», a first cylinder port 190, a second cyl
10S.
inder port 192 and a secondary pressure port 194.
When the valve 102 is in its neutral position, the valve
104 can -be shifted to the right by a solenoid 130 to pres 20 Through various internally drilled passageways, the pres
sure port 184, tank port 186 and drain port 188 commu
surize the cylinder passageway 122 and connect the cylin
nicate with the pressure ports 152, tank ports 148 and
der passageway .124 with tank, or can be shifted to the
drain ports 150 in the bottom face of the manifold 30
left by a solenoid 132 to pressurize the cylinder passage
and in the cover plate 28 (FIGS. 16 and 17). Tile face
way 124 and communicate the cylinder passageway 122
183 of the manifold 30 is also provided with drilled pas
with tank.
sageways 196 and 198 which are sealed off by plugs
From the foregoing, it is apparent that a number of
disposed iiush with the face 183. The passageway 196
additional valves can easily be added between the valve
forms part of the internal passageway network for com
104 and its connection to tank by means of the passage
municating the pressure port 152 with a pressure port
way 105 to control additional cylinder passageways. In
all of these arrangements the connecting passageways are 30 on another face of the manifold and the passageway 198
forms part of the internal passageway network for corn
formed either in the manifold 30, the reservoir body 26,
municating the tank port 154 on the bottom face of the
the various valve bodies or the adaptor blocks 66 and 68
manifold with a bore 280 having a pressure relief valve
as will be described to provide a compact assembly which
disposed therein as will >be described hereinafter. .
does not require any external piping connections other
than the hose connections necessary for connecting the 35 As illustrated in FIG. l1, the face 202 of the direc
tional valve 34 which is bolted to the face 183 of the
hydraulic power unit to the various hydraulic devices
manifold has the following port pattern: A pressure port
which it is to control.> As illustrated schematically in
184, tank port 186, secondary pressure port 204, drain
FIG. 4, a passageway 134 is also provided which com
port 188, cylinder port 190', cylinder port 192 and sec
municates with tank to provide the auxiliary tank con
nection 250 (FIG. 5) to which the hose 46 of FIG. 2 is 40 ondary pressure port 194. As before, each of the ports
in the faces 183 and ‘202 which have been designated
connected when the power unit is arranged to control a
by the same number align with one another when the
one-way hydraulic cylinder such as the hydraulic jack 48.
faces 202 and 183 of the directional valve and manifold
Referring to FIGS. 5 and 8, the construction of the
are bolted together. However, the secondary pressure
hydraulic power unit 24 having a single directional valve
port 204 will be sealed off by the face 183 of the mani
34 mounted thereon is illustrated in greater detail. When
fold since there is no port on the face 183 that will align
only the directional valve 34 is used, a return plate 140
with the secondary pressure port 204.
is mounted on the right face of the manifold 30, and
Referring to FIG. 8, the directional valve 34 is basi
the ñow of pressurized fluid passes from a hydraulic
cally a conventional directional valve having a spool 206
pump 142 coupled to the electric motor 32 by a connec
' tor 144, through the manifold 30, into the directional 50 slidably sealed within a central bore 208 and spring cen
tered by springs 210 and 212 acting on each end thereof.
valve 34, across the spool thereof, back into and across
The spool 206 is shifted to the right (up, as viewed in
the manifold, into and out of the return plate 140, back
FIG. ~8) by a solenoid 214 and is shifted to the left (down,
into the manifold and thence back to the reservoir
as viewed in FIG. 8) by a solenoid 216, each of the
body 26.
Referring to FIGS. 16 and 17 as well as FIG. 5, the 55 solenoids having plungers 218l and 220 projecting there
from and engaging Vthe ends of the spools in a conven
port pattern in the cover plate 28 and the bottom face
tional manner. Each of the solenoids is also provided
c-f the manifold 30 is illustrated in detail, as well as bolts
with pins ‘221 and 222, respectively, which project from
146 which extend through the manifold and cover plate
the outer ends thereof and are connected to> members
for securing them together. It will be observed that the
cover plate is provided With a tank port 148, a drain port 60 224 for engaging their respective pins 218 and 220 to
enable the spool 206 to be manually shifted when neces
150, a pressure port 152, a tank port 154, a tank port sary.
v
156, a drain port 158, a tank port 160 and a tank port
As illustrated in FIG. 8, the `spool is in its neutral posi
162. The bottom face of the manifold is also 'provided
tion. The pressure port 184 is communicated through
with corresponding ports which have been designated by
identical numbers to identify the ports in the cover plate 65 suitable drilled passageways in the valve body with the
secondary pressure port 204, and also communicates with
which communicate with the ports in the manifold.
the secondary pressure port 194 across the spool 206.
This same system will be used throughout the following
The tank port 186- is sealed off by the spool, as is each
description wherever possible. Consequently, when the
of the cylinder ports 190‘ and 192.
bottom face of the manifold 30 is bolted against the
The secondary pressure port 194 on the face 183 of the
upper ‘face of the cover plate 28 by the bolts 146, each 70
manifold 30, communicates with a secondary pressure
of the ports having the same numbers will be aligned
port 194 on face 226 of the manifold as illustrated in
with one another. It will -also be observed in FIGS. 16
FIG. l() through suitable drilled passageways 228 and
and 17 that the manifold 30 has a central aperture 164
230 in the manifold. Referring particularly to FIG. 10
therein and that the cover plate 28 has a central aperture
' 166. The pump 142 can Ibe bolted directly to the under 75 the »face226 is also provided with a tank port 160, drain
`:3,036,433
' port 158 and a tank port 162, all of which communicate
with the ports in the bottom face of the manifold having
the same number. The face 226 is also provided with
a ñrst cylinder port 228 and a second cylinder port 230,
(down, as viewed in FIG. 8) in response to the energiza
tion of the solenoid 216, the cylinder port 192 is com
municated with tank and the cylinder port 190 is con1~
municated with the pressure port 184, the secondary
pressure ports 194 and 204 both being sealed off by the
the manifold 39.
spool 206. When both solenoids are deenergized, the
Referring particularly to FIG. 9, the return plate 140
spool returns to its neutral position and both cylinder ports
has blind end ports 162, 230, 42‘28- and 158, each of which,
190 and 192 'are again sealed off by the spool and the
as do many of the other ports on some of the other faces,
pressurized huid flow through the pressure port 184,
has grooves 234 thereabout for receiving O-rings, and 10 across the spool and out of the valve through the second
cach of which overlie the ports on the face 226 on the
ary pressure port 194 as previously described.
manifold having the corresponding number of seal off
If it is desired to add a second directional valve to the
these ports. The return plate 140 also has ports 194
`hydraulic power unit, the return plate 140 is merely re
'and 160 which align with the ports having corresponding
moved and another valve, identical to the valve 134, is
numbers on the face 226 and which are communicated
bolted to the face 226 of the manifold as indicated in
with one another by a drilled passageway 236 having a
phantom in FIG. 5. rIïhe second valve would have the
plug inserted in the right end thereof. A third port 238
same port pattern las the directional valve 34 as illustrated
is also provided in alignment with the ports 160 and 194
in FIG. l1, and when bolted to the face 226, the port 194
and in communication with the drilled passageway 236
of the second valve would be aligned with the tank port
for a purpose to be described hereinafter,- the port 238 20 162 on the face 226, the port 192 with the cylinder port
being sealed off by the face 226 of the manifold. Con
230, the port 186 with the »tank port 160, the port 204
sequently, with the return plate 140 in position, all of the
with the secondary pressure port 194, the port 188 with
ports on the face 226 of the manifold will be sealed off
the drain port 158, and the port 190 with the cylinder
except the ports 160l and 194 and, therefore, the pres
port 228. The remaining port 184 in the added 'valve
surized fluid passing into the lsecondary pressure port 194 25 would be sealed off by the face 226 of the manifold.
of the return plate will lbe returned to the manifold
When in its neutral position the added valve would
through the drilled passageway 236, and the tank port 160.
enable fluid from the secondary pressure port 194 on the
To summarize, the path of flow of pressurized fluid in
face 226 to pass directly across the spool and out of the
the single valve arrangement illustrated in FIGS. 5 and 8
valve into the tank port 160 on the face 226, and thence
is from the pump 142 through the pressure ports 152 30 to the reservoir body 26 1as previously described. When
in the cover plate 28 and the bottom of the manifold 30
the spool of the second valve is shifted in one direction it
(FIGS. 16 and 17), out of the pressure port 184 in the
Wil-l communicate one of the secondary pressure ports
face 183 FIGS. 8 and l2 of the manifold, into the pres
with the cylinder port 228 and the cylinder port 230 with
sure port 184 in the face 202 (FIG. ll) of the direc
' the tank port 160, and when shifted in «the opposite direc
tional valve 34, across the spool 206 (FIG. 8), through 35 tion will connect the cylinder port 228 with the tank port
the secondary pressure port 194, into the secondary pres
160 yand the cylinder port 230 with the other secondary
sure port 194 on the face 183, across the manifold through
pressure port. Of course, both cylinder ports 228 and
drilled passageways 228 and 230 and the secondary pres
Y 230 on the face 226 of the manifold are connected with
» sure port 194 on the face 226, into the secondary pres
corresponding ‘cylinder ports 228 'and 230 on the face 244
as Well as bolts 232 for bolting the return plate 140 on
sure’port 194 and drilled passageway 236 of the return 40 (FIG. 6) of the manifold by suitable drilled passageways
to enable two additional hydraulic hose connections to
plate 140 and out the tank port V160 thereof (FIG. 9),
into the tank port 160 on the face 226 of the manifold
(FIG. 10), and finally through the tank ports 160 in the
be made thereto for operating a second hydraulic cylin
der.
Referring to FIG. 5, face 246 of the manifold 30 is pro
the reservoir body 26. In this manner, a'continuous flow 45 vided with the ports 248 and 252 which are adapted to
of pressurized fluid passes from the pump in the reser
have'pressure gauges connected thereto to provide pres
voir through the manifold, through the directional valve
sure indications `as previously described with reference
34, back across the manifold, through the return plate
to FIG. 4. The port 248 communicates with the primary
140, back into the manifold, and thence to the reservoir.
pressure port 152 in the bottom face of the manifold 30
When the spool 206 is shifted to the right (up, as 50 to provide a means for obtaining an indication of the pri
bottom face of the manifold and the cover plate 28 into
Vviewed in FIG. 8) by the solenoid 214, Ithe secondary
pressure port 194 and the pressure port 184 are sealed olf
by the spool, the cylinder port 190 communicates with
mary pressure developed by the pump 142, and the port
252 communicates with the drilled passage 228 (FIG. 8)
> to provide means for obtaining an indication of the sec
the tank port 186, and the secondary pressure port 204
ondary pressure. The port 250 is an auxilliary tank port
communicates With the cylinder port 192. It is again 55 which communicates with the aligned tank .ports 156 in
noted that the secondary pressure port 204 is communi
the bottom face of the manifold and in the cover plate 28.
cated directly with the pressure port 184 by means of suit»
The auxiliary tank port 250 is provided for applications
able drilled passageways (not shown) in the valve body
such »as that illustrated in FIG. 2 wherein a single acting
so that it will be pressurized even though the spool pre
hydraulic jack 48 is Vemployed and one of the hoses com
vents communication of the port 184 with either »the cylin 60 ing from one of the cylinder ports is connected directly
der port 190 or the secondary pressure port 194. Suit
to the auxiliary tank port.
able drilled passageways a-re also formed in the manifold
As previously mentioned, the manifold 30 is also pro
e 30 for communicating the cylinder ports 190 and 192 in
the face 183 thereof (FIG. 12) with similar cylinder
vided with the built-in pressure relief valve 254 as illus
trated in FIG. 5'which extends Within the bore 200 ex
ports 190 and 192 in a face 244 on the right side of the 65 tending through the manifold as more clearly illustrated
manifold as viewed in FIG. 8. These latter ports are
more clearly illustrated in FIG. 6 wherein a front view
of the face 244 is illustrated. Of course, these latter
cylinder ports 190 and 192 would be connected directly
in FIG. 19. A drilled passageway 258 communicates the
lower end‘of the bore 200 with the pressure port 184 as
illustrated in dotted lines in FIG. l2. Another passage
way 198 is `drilled in the manifold to communicate the 1
to a Work device, such as la hydraulic cylinder, by suitable 70 bore 20G with the tank port 154 opening on the bottom
hoses in the manner illustrated in FIG. 1. Thus, with
face of the manifold and aligned with »the tank port 154
‘
the spool 206 shifted to the right, the cylinder 192 would
be pressurized and the cylinder 190 connected with tank
in the cover plate 128.
so as to shift the hydraulic cylinder in one direction.
tion 256 of the bore 20G to seal the tank passageway 198
Conversely, when the spool 206 is shifted to the left
.
A shouldered piston 262 is slidably disposed in a por
and a suitable spring 264 resiliently engages the shouldered
3,036,433
10
end of the piston to normally maintain it in the position
illustrated. A nut and cap lassembly 266 is screwed in the
upper end of the .bore 200 and engages the upper end of
the spring 264 in a manner to vary the compression thereof
to preset the fluid pressure that must «act on the lower end
of the piston to move it upwardly until it exposes a portion
of the tank passageway 198. The pressurized fluid is in
troduced below the lower end of the piston so as to act
The face 288 is also provided with a secondary pres
sure port 194 which communicates with a secondary
pressure port 194 on the face 284 of FIG. 15, and the
face 284 is provided with a iirst cylinder port 290 which
communicates with the cylinder port 298 on one end of
the adaptor, and a second cylinder port 292, which corn
municates -with the cylinder port 300 on the opposite
end of the adaptor block.
With this construction the pressurized fluid will flow
thereon through the drilled passageway 258 as previously
described. A small passageway 268 is .also provided to 10 from the pump 142 into the manifold 30 as previously
described, into the primary pressure port 184 on the face
communicate the space adjacent the .upper end of the
386 of the adaptor 280, out through the primary pres
piston 262 with the tank passageway 198 to drain any
sure port 184 on face 288 thereof, into the primary
ñuid that may work its way into this area.
pressure port 184 of the directional valve 286, and,
As will also be observed in FIG. 5, a heat exchanger
having a plurality of tubular convolutions 274 is cast 15 assuming the spool is in its neutral position, across the
spool, out the secondary pressure port 194 into the sec
directly in the wall of the reservoir body 226 with an
ondary pressure port 194 on the face 288 of the adaptor,
inlet 276 and an outlet 278 provided at the upper and
ont through the secondary pressure port 1914 on the face
lower ends thereof. This permits a water souroe to be
284 of the adaptor, into the pressure port 184 of the
directly connected to the inlet and outlet on the reservoir
body where it is desired to cool the hydraulic ñuid. The 20 directional valve 34, across the spool 206 (assuming it
is also in its neutral position), out the pressure port 194
inlet and outlet connection and the manner in which
of the valve, into the pressure port 184 on the face 284
they cooperate with the ends of the tubular convolutions
of the adaptor, completely across the adaptor and out
is more clearly illustrated in FIG. 18.
the secondary pressure port 194 on the face 306 of the
Referring to FIGS. 6 and 7 when it is desired to
mount four directional valves on the hydraulic power 25 adaptor, into the secondary pressure port 19‘4 on the
face 183 of the manifold 30, and completely through the
unit adaptor blocks 280 and 282 are secured directly to
manifold and out through the secondary pressure port
the faces 183 and 226, respectively, of the manifold 30.
194 on the face 226 thereof in the same manner that it
The directional valve 34 which was previously bolted on
previously traveled through the manifold to the return
the face 183 of the manifold is bolted on a face 284 of
the adaptor block 280 to control a cylinder port 290y on 30 plate 140.
Of course, with the adaptor block 282 mounted on
one end of the adaptor block and a cylinder port 292
the face 226 in place of the return plate 140, the pres
on the other end thereof. A second directional valve
surized fluid will flow through the adaptor block 282,
286 can then be mounted on a face 288 of the adaptor
into the valve 294 mounted thereon, back into the
280 to control the cylinder ports 190 and 192 as will
be described. In a similar manner, a directional valve 35 adaptor, into the valve 302, and back into the adaptor in
exactly the same manner as just `described with regard
294 can be mounted on a face 296 to control the cylin
to the .adaptor 290, and finally back into the manifold
der ports 228 and 330 on the manifold 30 and a fourth
38 through the tank port 162 of the face 226y thereof
directional valve 302 mounted on a face 304 of the
and thence to the reservoir body 26 as also previously
„ adaptor block 282 to control cylinder ports 298 and 300
described. When the directional valve 286, which is
40
opening on opposite ends of the adaptor block 282.
mounted on the face 288 of the adaptor block 280 is
Suitable layers of gasket material can be disposed be
shifted, it will seal off communication between the ports
tween the engaging faces to improve the seal there
184 and 194 on the face 288, and will connect the cylin
between.
der port 19t) ywith the pressure port 184 and the cylinder
Referring to FIGS. 6 and 14, face 306 of the adaptor
280 which engages the face 183 of the manifold 30 has 45 port 192 with the tank port 186. Conversely, when the
spool is shifted in the opposite direction it will connect
a plurality of bolts 388 extending therethrough for secur
the
cylinder port 192 With the secondary pressure port
ing the adaptor to the manifold. The face 306 also has
284 and the cylinder port 190 with the tank port 186.
aport pattern which is identical to the port pattern of
Of course, the cylinder ports 198 and 192 on the surface
vthe directional valve 34; namely, a primary pressure port
288 of the adaptor 280 communicate with the cylinder
50
184, a tank port 186, a. secondary pressure port 204
ports 198 and 192 on the face 306 of the adaptor which,
which is blocked oiî by the manifold, a drain port 188,
in turn, communicate with the cylinder ports 190 and
a first cylinder port v190, a second cylinder port 192, and
192 on the manifold 3€) to control the hydraulic devices
a second pressure port 194. Each of these ports with
connected thereto by the external hoses as previously
the exception of the port 204 align with ports having
corresponding numbers on the face 183 of the manifold 55 described.
When the directional valve 286 is in its neutral posi
as did the directional valve 34 when it was directly
tion, pressurized iiuid will flow therethrough to the direc
mounted on the face 183.
Referring to FIGS. 13 and 15 as well as FIG. 14, the
tional valve 34 which can then be shifted to seal olf the
pressure ports 184 and 194 on the face 284 of the adaptor
through the adaptor 280 and open on the face 284 there 60 from one another, communicate the cylinder port 292
with the secondary pressure port and communicate the
of in the positions indicated by the numerals ‘186 and
cylinder port 290 with the tank port 186. When the
188 in FIG. l5. The pressure port 184 communicates
spool is shifted in the opposite direction, it will com
with a pressure .port .184 on the face 284 by means of
tank port 186 and drain port 188 extend completely
municate the cylinder port 298 with the secondary pres
(which are sealed 01T at the face 288 by suitable plugs) 65 sure and the cylinder 292 with the tank port 186. The
cylinder ports 298 and 292 on the face 284 of the adaptor
and a drilled passageway 314 in the face 284 of FIG. 15
280 communicate with the cylinder port 290 on one end
(which is also sealed olf by a suitable plug). The cylin
of the adaptor and the cylinder port 292 on the other
der port 19t) on the face 306 (FIG. 14) communicates
end thereof, respectively, to enable external hose con
with a cylinder port 190 on the face 288 (FIG. 13), the
cylinder port 192 Vof the face 306 with a cylinder port 70 nections to be made to the adaptor as illustrated in
FIG. 2.
192 of face 288, the-tank port 186 of face 306 with a
Fromgthe foregoing, it will be apparent that the hy
tank port 186 of face 288, the tank port 188 of face 366
, suitable drilled lpassageways 310 and312 in -FIG. 13
. with a tank port 188 of the face 288, and the secondary
l pressure port v204 of face 306 with a secondary pressure
_port 284vof the face 288.
draulic power unit 24 can be assembled in any one of
the following combinations: The >single valve arrange
75 ment illustrated in FIGS. l and 5, the four-valve ar
3,036,433
ll
12
. rangement illustrated in FIG. 6, a two-valve arrangement
3. The invention as defined in claim 2 wherein said
port and passageway means also provides an auxiliary
tank connection communicating the exterior of said mani
Awherein the return plate 140 is replaced with a second
valve as illustrated in phantom in FIG. 5, a three-valve
arrangement wherein one of the adaptor blocks of FIG.
6 is removed and a single directional Valve is connected
fold with said reservoirbody.
4. A hydraulic power unit comprising a reservoir body,
. to the manifold 30 in its place, and ka two-valve arrange
a manifold mounted on said body, said manifold hav
ment wherein one of the adaptor blocks of FIG. 6 is re
ing port and passageway means therein communicating
moved and replaced with the return plate 140. Still fur
with said reservoir body and providing predetermined
ther, the hydraulic power unit of FIG. 6 may be initially
port patterns on a pair of opposite faces of the manifold,
assembled with the four directional valves thereon and 10 said port and passageway means also providing a first
pair of cylinder ports communicating with the port pat
if it becomes necessary subsequently to remove one of
the valves, such as the valve 294 for example, this can
tern on one 4face thereof and a second pair of cylinder
be readily accomplished by merely bolting the return
ports communicating with the port pattern on the other
face thereof, first and second directional valves respec
tively mounted directly on each of said faces, each of
said valves having a port pattern therein corresponding
to and aligned with the port pattern of the face engaged
plate 146 directly to the adaptor block 282 in place of the
directional valve 294 without going to the trouble of
removing the adaptor plate 282, and without disturbing
any external piping connections. The return plate 140
can be bolted to any one of the various -faces of the
adaptor blocks 280 and 282, or either of the faces 183
and 226 of the manifold 3d. The additional port 238 20
(FIG. 9) is provided in the return plate 140 in com
munication with the drilled passageways 236 to enable
the return plate to be bolted to the various faces wherein
the pressure port may be disposed on the other side of
the central tank port 160.
V25
While it will be apparent that the embodiments of the
invention herein disclosed are well calculated to fulfill
thereby, and pumping means for pumping hydraulic fluid
from said reservoir body into the port and passageway
means of said manifold, said port and passageway means
circulating the pressurized fluid from the reservoir body
through the manifold into said first directional valve,
across the spool thereof when the Valve is in its neutral
position, back into and across the manifold, into the
second directional valve and across the spool thereof
when it is in its neutral position, back into the manifold
and finally into the reservoir body, each of said direc
the objects of the invention, it will be appreciated that
the invention is susceptible to modification, variation and
tional valves blocking the flow of pressurized ñuid across
the spool thereof and back into the manifold when in one
change without departing from the proper scope or fair 30 or the other of their shifted positions, each of said direc
meaning of the subjoined claims.
What is claimed is:
tional valves controlling the pair of cylinder ports in the
manifold communicating with the port pattern of the
'
'
l; A hydraulic power unit comprising a reservoir body,
face of the manifold engaged by the valve so as to pres
surize one of the cylinder ports and communicate the
a manifold mounted on said reservoir body, said mani
fold having port and passageway means therein com
35 other directly with the reservoir body through the mani
municating with said reservoir body and providing a pre
fold when the valve is shifted to one position and when
determined port pattern on two separate faces of the
shifted to the other of its positions pressurizing the other
of the cylinder ports and communicating the one cylinder
manifold, each of said faces having a directional valve
mounted directly thereon with the port pattern of each
port directly with the reservoir body through the manifold.
valve corresponding to and aligned with the port pattern 40 5. In a hydraulic power unit adapted to have a plu
of the face upon which it is mounted, said port and pas
rality of directional valves mounted directly thereon for
sageway means also providing a iìrst pair of cylinder
controlling pairs of cylinder ports in the hydraulic power
ports communicating with the port pattern on one of
said faces and a second pair of cylinder ports communi
caring with the port pattern on the other of said faces,
said reservoir body into the port and passageway means
Vof said manifold whereby the directional valves are
mounted on their respective faces to control the pair of
unit, a directional valve adapted to be mounted on the
hydraulic power unit to control one of the pairs of cylin
der ports thereof, said directional Valve comprising a body
having a central bore extending therethrough and a spool
slidably sealed within said bore, means for shifting said
spool in one direction from said neutral position to a iirst
position and in another direction to a second position, a
cylinder ports associated therewith by controlling the
first pressure port in said body communicating with said
and pumping means for pumping hydraulic fluid from
ñow of pressurized fluid between the reservoir body and 50 central bore, a second pressureport in said body having
the port and passageway means.
one end thereof communicating with said íirst pressure
2. A hydraulic power unit comprising a reservoir body,
port and the other end thereof communicating with said
a manifold mounted on said reservoir body, a directional
central bore, first and second cylinder ports in said body
communicating with said central bore, a secondary pres
valve mounted directly on one face of said manifold,
said manifold having a port and passageway means 55 sure port Vin said body communicating with said central
therein communicating with said reservoir body and the
ports of said directional valve, said port and passageway
means also providing a port pattern on another face of
bore, a tank port in said body communicating with said
central bore, each of said ports in the valve body with the
exception of said second pressure port communicating
said manifold and a pair of cylinder ports in the mani-`
with one face of said body in a predetermined port pat
fold, return means on said other face for recirculating 60 tern, said first and secondary pressure ports communicat
pressurized fluid passing from one of the ports on said
other face back into another one of the ports on the
ing with one another across said spool and each of the
other ports being sealed off by said spool when the valve
is in its neutral position, said íirstpressure port commu
nicating with said first cylinder port and said second cyl
way means of said manifold, which circulates the ñuid 65 inder port communicating with said tank port across said
into the directional valve and across the spool thereof
spool and each of the other ports being sealed off by said
' when the valve is in its neutral position, back through
spool when the valve is in said first position, and said sec
other face, and pumping means for pumping hydraulic
fluid from said reservoir body into the port and passage
ond cylinder port communicating with said secondary
and across the manifold into said return means, back
pressure port and said first cylinder por-t communicating
into the manifold and then into the reservoir body, said
directional valve pressurizing one of said cylinder ports 70 with said tank port across said spool and each of the
other ports being sealed off by said spool when the valve
is in said second position.
6. A hydraulic power unit comprising a reservoir body,
- and communicating the other Vdirectly with the reservoir
body through the manifold when shifted to one position
and pressurizing the other of said cylinder ports and
, communicating said one cylinder port with the reservoir t,
body when shifted to the other of its positions.
' 75
a manifold mounted on said reservoir body, an adaptor
mounted directly on a first face of said manifold, a first di
3,036,433
13
14
rectional valve mounted directly on a first face of said
adaptor, a second directional valve mounted directly on
a second face of said adaptor, »return means mounted di
rectly on a second -face of said manifold, and pumping
means for pumping hydraulic iiuid from said reservoir
body into said manifold under ressure, said manifold and
adaptor having port and passageway means therein for
second adaptor including a fourth pair of cylinder ports
circulating the pressurized ñuid from the -reservoir body
trolling pairs of cylinder ports in the hydraulic power unit,
communicating with and controlled by said fourth direc
tional valve, said third pair of cylinder ports in the mani
fold communicating with and controlled by said fourth
directional valve.
9. In a hydraulic power unit adapted to have a plurality
of directional valves mounted directly thereon for con
a manifold mounted on the reservoir body of the power
through the manifold `and the adaptor, into and out of said
first valve across the spool thereof when it is in its neutral 10 unit, and an adaptor mounted directly on a first face of
said manifold, said manifold and adaptor having port and
position, through the adaptor into and out of said second ’
passageway means therein communicating with said res
directional valve across the spool thereof when it is in its
neutral position, back through the adaptor and the mani
ervoir body and providing a predetermined port pattern
fold, into and out of said return means and finally through
the manifold into the reservoir body, said port and pas
sageway means including a tirs-t pair of cylinder ports in
said manifold controlled by said ñrst directional valve and
a second pair of cylinder ports in said adaptor controlled
by said second directional valve.
on said íirst face and a second face of the manifold and
a third and fourth face of said adaptor, each of said sec
turn means comprises a third directional valve and where
in said port and passageway means of the manifold in
cludes a third pair of cylinder ports in said manifold con
of cylinder ports communicating with said íirst face of
said manifold and a second pair of cylinder ports in said
manifold communicating with said second face thereof
trolled by said third directional valve, said third valve re
and a third set of cylinder ports in said adaptor commu
ond third and fourth faces being adapted to have a direc
tional valve mounted directly thereon with the port pat
tern of the valve corresponding to and aligned with the
port pattern of the face upon which it is to be mounted,
7. The invention as »defined in claim 6 wherein said re 20 said port and passageway means also providing a first pair
circulating the pressurized fluid directly across the spool 25 nicating with said third face thereof, said first set of cyl
inder ports being adapted to be controlled by the direc
thereof and back into the manifold when in its neutral
position.
tional valve mounted on said fourth face of the adaptor,
said second pair of cylinder ports being adapted to be
8. The invention -as defined in claim 6 wherein said re
controlled by a directional valve mounted on said second
turn means comprises a second adaptor mounted on said
second face of the manifold, a third directional valve 30 face of the manifold and said third set of cylinder ports
mounted on a ñrst face of said second adaptor, and a sec
ond directional valve mounted on a second face of said
being adapted to be controlled by the third valve mounted
on said third face of the adaptor.
second adaptor, the second adaptor having port and pas
References Cited in the tile of this patent
sageway means therein for circulating the pressurized
fluid coming from the manifold into and through said sec 35
UNITED STATES PATENTS
ond adaptor into the said third directional valve, across
2,042,186
Peterson ____________ __ May 26,
the spool of the third directional valve when in its neutral
2,511,184
Walling ______________ __ June 13,
position, back into and through the second adaptor to
2,605,613
Grebe ______________ __ Aug. 5,
the fourth directional valve and across the spool thereof
2,635,586
Kuhn _______________ __ Apr. 21,
40
when in its neutral position back into said second adaptor,
2,679,727
McLeod ____________ __ June 1,
and finally through the second adaptor into the manifold
2,693,824
Harrington et al. ______ __ Nov. 9‘,
after which it is returned to the reservoir body as previ
2,781,879
Ebersold ____________ __ Feb. 19‘,
ously described, said port and passageway means of said
1936
1950
1952
1953
1954
1954
1957
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