close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2411606

код для вставки
‘ Nov. 26, 1946.
'
2,41 1,606
.5. 4. WILSON '
POWER TRANSMISSION PUMP
Filed Sept. :5, 1942
2 Sheets-Sheet 1
-
INVENTOR.
BURTON‘ J. WlLSON
BY
ATTORNEY.
Nov. 26, 1946.
B, J, w‘LsoN
2,411,606
POWER TRANSMISSION PUMP
‘ Filed Sept. 3, 1942
2 Sheets-Sheet 2
v24 7
72
‘
/IIIIIIA '
5/
t 63
INVENTOR.
BY
vPatented :Nov. 26, 1946
I
- .
I
I
'
UNITED STATES PATENT‘ OFFICE}.
‘Burton vJ. Wilson,- Detroit, Mich., assignor to’
Vickers Incorporated, Detroit, Mich., a corpora
tion of Michigan
> Application September 3, 1942, Serial No. 457,163
'
l
' 6 Claims.
(Cl. 103-435)
1
'
This invention relates to power transmissions, '
ure
or more ?uid pressure energy translating de-
vices, one of which may function as a pump and
The invention is more particularly concerned
.
_
v_
_
g
'
Figure 8 1s a cross section on line 8-—8 of Fig
0f Figul‘q 1-
with a pumping unit of the rotary, type and with
control means for regulating the volumetric dis'
‘
_
.
.
5 ureFigure 9 is
a circuit
diagram of the pump unit
another as a, fluid motor,
'
_
Figure 7 is a cross section on line 1-1 of Fig
particularly to those of the type com-prising two ‘
charge-memos
‘
v
u
_ .
_
‘
Referring now to Figure 1: there is shown a,
mam body "1 havlngtwo cylindrical recesses l2
‘
and H in whichare mounted rotary pumping
A form of pump in common use in the hydraulic 1° umts '5 and '8- The latter 1119-2 be of any Sult
power transmission
?eld
utilizes
a rotor having
able
typerand as Shown are similar to the vane
'
'
‘
r ' described in the patent to Harry F. Vickers,
atherewith
plurality.and
of substantially
radial vanes rotatable
slida'ble relative thereto. The
_
I
t
-t
Dump
No- 1,989,900- A1‘- end cap 20 is mounted on the
Stato member
body I!) to retain the pump unit [8 inthe recess
léhambers
15 ' I4shaft
and carries
a bearing
22 in which
end 28
of
- fwo?gghagg?lageiggogsri’ngrzlglmi’lping
.
.
.
24 is rotatably
mounted.
An one
end cap
through
which
the
vanes
pass carryingSingle
?uid from
the inlet
port
to’ the
and
.
.
. outlet pom
t
an
t
-
'
1
I
ur
9'
_ the pump umt
_ l6 in
and
?ller block
the recess
It’, the28enretain
cap carrying
a bearing
38
ose
2°
-
lg‘fnglilzn‘i’gggtggr?szigggp $8223; 3116518 law
and
m
.
- ihait
.
“ is
arthritis:
mg the pump to permit it to circulate ?uid idly. 25 port
It is an‘ object’ of ‘the present give??? to plug;
w 10
I
pump units. A suitable mounting ?ange 38 is
We of WW‘
vide an improved pumping uni
.
harassing?
suitable ‘cap screws ‘or other fastening
means, not shown, are provided for holding the
may 7
end plates at 2°, 26 and 36 together.
unloaded without requiring an external bypass
The, um
from the discharge port to the suction port of the
unit '6 is
.
. .
rovid-ed with two dia_
metricagly cgposite denvegy ‘ports 38 and 40 (See
pump‘
30 Figure 5) and two diametrically opposite suction
A further °bi9°t is t° mimic‘? a uni‘ '°f this
ports 42 and 44. The body it is provided with a
character wherein the radial movement of the
cored passage ‘5 which has arcuate branches ‘8
vanes mauve -t° the TOW may be VaYFabIY‘ °‘_’“'
and so extending partially around the shaft 24150
trolled ‘to thereby reguiate the pumpmg ac'tlon
connect with the delivery ports 38 and 40. They
either inhibiting it altogether _or causing it to 35 passage 45 forms a delivery conduit for the pump
take Place in _a normal mannerFurther obJects and advantages of the present
invention will be apparent‘ir'om the following deSO?’PtiOIi» reference being had‘ 170 the accompany"
ins drawings wherein a Preferred form of the w
unit' l6 and extends to one sideJetoward the top
in Figure 1) of the pumping uhm
The suction ports 42 and 44 of the pump unit
l6 communicate with a cored passage 58 having
present invention is Clearly Shown.
around the shaft 24, the branch 62 being disposed
In the dr-aWmgSI'
_
'
;
Figure 1 is a- longitudinal cross section of a
Pumping uni-t Qmb?dying a preferred form of the
,
arouate branches so and 52 extending partially
radially outward of the branch 50 of the delivery
‘ passage 45,
I
A passage 63 has arcuate branches 64 and 85
present invention.
'
.
'45 ‘which connect with suction ports 88 and ‘In of the
Figure 2 is a cross section on line 2-2 of Fig-'
pump unit I8. The passage 63 has a threaded ‘
ure 1.
'
a
1
,
_.
opening 12 which forms an inlet connection for
Figure 3 is a cross section on line 3-3' of Figure 1'.
\
7
the pump unit asawwhole, A wall 14 which sepa
rates the passages 58 and 63 is formed with an
Figure 4 is a cross section» on line 4-} of Fig- 50 opening 16 which forms the seat for a check valve
ure 1.
18. The latter permits free ?ow from the inlet
Figure 5 is a cross section on line 5--5 of Figport 12 to the passage 58 but prevents return ?ow.
ure 1.
I
_
Figure 6 is a cross section on line 8-6 of Figure 1.
'
{,Apassage“ has branches 82 and 84 which con
, nect with outlet ports 88 and 88 of the pump unit
_ 55 I8. ._The passage 80 has a lateral branch 90
'
1
'
t
2,411,606
which opens into the passage 46 and an outward
ly extending branch 92 which is intersected by
a transverse bore 94. The branch 92 connects
with a pipe connection 96 forming the discharge
outlet of the pump unit as a whole.
.
The bore 94 has a reduced diameter seat por
tion 98 adjacent the lefthand wall of passage 92
in Figure 4' and extends beyond the seat portion
4
tion in Figure 9. Accordingly, the pump dis
charge pressure will be connected through duct
I20, enlargements II 2 and. H4, and duct I32 to
the circumferential grooves I30. Thus, ?uid
pressure is maintained beneath the vanes of the
unit I6 to keep them projected into tight contact
with the circumferential walls of the pump work
ing chamber. This operation of unit I6 is con
98 to connect with a pipe connection I00 forming
an over?ow port for the unit as a Whole. Slid 10 ventional and identical to that of the unit I8
under these conditions.
ably mounted in the bore 94 is a relief valve I02
having a conical valve portion I04 normally clos
ing the seat 98. The end of the bore 94 is closed
by a cap I06 having therein an adjustable pilot
relief valve I08 adapted to control the operation
of valve I02. The construction and operation
of the valve I 02 and its control by the pilot relief
As soon as the load device imposes additional
resistance so that the pressure in discharge con
duit 80 ‘builds up su?‘iciently to push valve spool
I24 to the left in Figure 9, ‘the circumferential
grooves I30 become connected to the exhaust
side of the pump through duct I 32, enlargements
H4 and H6, duct I22 and port I00. The pres
sure in passage 46, however, is applied adjacent
to Harry F. Vickers, No. 2,043,453, to which refer
ence is made for further detail. Brie?y, the valve 20 the discharge ports 38 and 40 to the radially outer
end of the vanes and, accordingly, causes them
I02 acts to maintain the passage 02 cut o? from
to retract inwardly, thus opening a free path
communication with the relief passage I00 until
valve I08 are described in detail in the patent
from the discharge ports 38 and 40 to the suc
tion ports 42 and 44. Accordingly, the vanes
around the entire circumference vof the rotor are
.to whatever degree may be required to prevent
25 subject to full pump pressure from the unit I8
the pressure from rising beyond that point. '
applied to their outer end, and they are thus
As seen particularly in Figure 3, there is
prevented from being projected by centrifugal
formed in the body a small bore H0 provided
force into contact with the walls of the pump
with three spaced enlargements II2, II 4 and H6.
chamber.
‘
The upper end of the bore I I0 communicates with
The discharge pressure, although it backs up
the extension 92 of passage 60 through a duct I I8. ‘30
into the suction ports 42 and 44 of pump unit I6,
A duct I20 connects extension 92 with the en
is prevented from bypassing to tank by the check
largement H2, A duct I22 connects the port I00
valve 78. In this way, a higher degree of pres
with the enlargement II6. Slidable in the bore
I I0 is'a valve spool I24 which is urged upwardly 35 sure may be built up in the discharge port oi.’
the pump by the small-volume pumping um't I8,
in Figure 3 by a spring I 26. The latter is ad
and the large-volume unit I6 is rendered inef
justable by means of a screw I v28. I It will be seen
fective as a pump. The valve I02 acts in the
that the spool I24 is shiftable in response to
manner of a conventional relief valve to limit
pressure variations in extension 92 and, when
the maximum pressure which can be applied to
shifted downwardly by a rise in pressure, con
40
a predetermined maximum pressure is reached in
t he passage 92, at which point the valve I02 opens
the pump as a whole.
nects the central enlargement H4 with the over
?ow port I00, while, when the valve is shifted up
wardly by a fall in pressure, the central enlarge
ment H4 is connected with the pump discharge
pressure at extension 92.
As seen in Figure 1, the pump unit I6 is pro
vided with a pair of circumferential grooves I30
which communicate with the inner end of the
slots in which the vanes of unit I6 slide. These I
circumferential grooves I30 connect by a duct
I32 with the central enlargement II 4 in valve
bore IIO. Similar circumferential grooves are
preferably provided in connection with the pump
unit I8 but are permanently connected with the
pump pressure supply in- a manner well known in
the small-volume pump alone, the large-volume
In operation, referring particularly to the cir
pump is not bypassed but is rendered entirely
non-operativetby the action of ?uid'pressure on
the art.
It will be seen that a two-volume pumping unit
of this character is particularly adapted to those
types of circuits wherein a large volume of ?uid
is required against a fairly low pressure and at
other times a smaller volume is required at a
much higher pressure. Circuits of this nature
are commonly found in machine tool drives
wherein the large volume is required for rapidly
advancing a machine part to its working posi
tion and wherein the smallvolume is required for
slowly feeding the part on its actual working
stroke.
It will be noted that, during the operation of
the radial vanes. In this way, the wear on the
cuit diagram of Figure 9, it will be seen that, with
ends of the vanes as well as the wear on the
both pump umts I6 and I8 being driven by the
peripheral face of the pumping chamber is ma
rotation of drive shaft 24, ?uid will be taken in
through the inlet port ‘I2, a minor fraction going 60 terially reduced as compared with previous meth
ods' of unloading a pump of this nature.
through passage 63 to the inlet ports 68 and "I0
of pump unit I 8 and a major portion passing
While the form of embodiment of the invention
through check valve 78 and passage 58 to the
as herein disclosed constitutes a preferred form,
inlet ports 42 and 44 of pump I6. The units
it is to be understood that other :forms might be
transfer the ?uid to their respective delivery, 65 adopted, all coming within the scope of the
claims which follow.
ports, such ?uid passing from the passages 46 and
vWhat is claimed is as follows:
80 past the relief valve I02 and out through the
discharge connection 96.
1. A pump unloading system for rotary vane
type pumps of the type having a vane-project
When the ?uid requirements of the device
which is being driven by the ?uid output of the 70 in'g pressure chamber effective when the pump
is in operation to project the vanes into opera
pump are such as to impose only light or medium
tive position, said pump having a suction inlet
resistance to the ?ow of ?uid, the pressure in
discharge conduit 80 will be low, and the spring
I26 will hold the valve I24 in its righthand posi~ 75 munication with said outlet for maintaining pres
the effective opera
2,411,606
5
6
fecting such inoperativeness or operation, an~
other of said pumps remaining in operation and
being connected to said pressure applying means
tion of the ?rst pump, a valve for selectively
causing ?uid pressure to build up or to fall off
in said chamber, and a check valve on the suc
during inoperativeness of the ?rst pump' whereby
tion side of said pump to prevent exhausting of
pressure is maintained available for said pressure
?uid from the discharge to the suction side when
applying means.
pressure falls off in said chamber and the vanes
5. A ‘multiple delivery rate pumping unit com
are consequently retracted from operative posi
prising a plurality of pumps driven from a com
tion.
mon drive shaft, one of said pumps being of the
2. A rotary vane type pump having an inlet
rotary type and having working elements. adapted
and an outlet and alternately retractable and 10 to be selectively rendered inoperative during ro
extendable vanes for sealing the passage of ?uid .
tation of the pump or placed into operation, ?uid
' between the pump inlet and the pump outlet, a
pressure applying means for selectively effecting
check valve at the pump inlet, means for selec
such inoperativeness or operation, another of
tively controlling the application or removal of
said pumps remaining in operation and being
15
pressure to said vanes to at times maintain the
connected to said pressure applying means dur
vanes continuously retracted whereby such seal
ing inoperativeness of the ?rst pump whereby
ing is prevented and the pump is rendered inop
pressure is maintained available for said pressure
erative while continuing to rotate, and means for
applying means, and a check valve connected
maintaining pressure in said outlet‘ during non
with the ?rst-mentioned pump for preventing
20
operation of said pump. '
back?ow therethrough while the pump is inoper
3. A rotary vane type pump having an inlet
ative.
'
and an outlet and alternately retractable and ex
6. A multiple delivery rate pumping unit com
' tendable vanes for sealing the passage of ?uid be
prising a plurality of pumps driven from a com
tween the pump inlet and the pump outlet, a
mon drive shaft, oneiof said pumps being of the
check valve at the pump inlet, means for selec 25 rotary type and having working elements adapted
tively controlling the application or removal of
to be selectively rendered inoperative during ro—
pressure to said vanes to at times maintain the
tation of the pump or placed into operation, ?uid
vanes continuously retracted whereby such seal
pressure applying means for selectively effecting
ing is prevented and the pump is rendered inop
such inoperativeness or operation, another of
erative while continuing to rotate, and a second 30 said pumps remaining in operation and being
pump having its outlet connected with that of the
connected to said pressure applying means during
?rst pump to maintain pressure therein during
inoperativeness of the ?rst pump whereby pres
nonoperation of the ?rst pump.
sure 'is maintained available for said pressure ap
4. A multiple delivery rate pumping unit com
plying‘ means, and a check valve located in the
35
prising a plurality of pumps driven from a com
inlet of the ?rst-mentioned pump for preventing
mon drive shaft, one of said pumps being of they
back?ow therethrough while the pump is inopera
rotary type and having working elements adapted
to be selectively rendered inoperative during ro
tation of the pump or placed into operation, and
v ?uid pressure applying means for selectively ef
tive.
'
BURTON J. WILSON.
40
e)
.
.
m
f
Документ
Категория
Без категории
Просмотров
0
Размер файла
549 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа