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Патент USA US2411705

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Patented Nov. 26,> 1946
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2,411,105
A 1.11,]v1r1va1),y STATES PATE-Nr orgies.
Walter EgBenjamîn, Anderson, Ind., assigner to _
Pierce Governor Company, Anderson, Ind.
Application oàtqbertai, 1942, seria1N0.4s3,1s9
'_ 3 claims. (01.121-41) ~
21
l f
.
This invention relates to a hydraulic booster of
the servo-motor type, thaty is. when 'actuatedy it'
ing and the following description and'claims:
In the drawing
multiplies the ractuatingV power tothe desired
amount.
f
,
The full nature of the invention will be more
fully understood from the accompanying draw
Fig. 1 is a central sectional view of a power
y
' Itis to be.k understood that servo-motors may
multiplying embodiment of the invention parts
be manually actuated. rIn conventional servo
being illustrated in the idle,A~ off throttle or non
motorsf associated with governors, commonly
power transmitting position.
called hydraulic, isochronous type governors, the
Fig. 2 is a transverse sectional view through the
governor weights, by reason of the parts vern
device approximately in the plane including the
10
ployed and their connections, always are in a
power transmitting rock-shaft.
partlyv exploded, that is partly expanded, posi
Fig. 3 is a view similar to Fig. 1, but with the
parts in the full throttle or full power transmit
tion when the valve of such structure responsive
to such weights is in neutral. position. It is cus
ting'position.
tomary to »compensate for this `inherent instabil
`
v
Fig. 4 is an end view of the embodiment shown
in Figs. 1 to 3 and corresponding to the section
power piston of the servo-motor to increase or
shown in Fig. 2, that is 'of that end of the device.
decrease the governor main spring force..
In the drawing, IG. indicates a main body cast
It is the object of this invention` to eliminate
ing having an anchoring flange II. The former
this hunting or surging common to conventional
servo-motorsespecially when same. are _applied to 20 includes cylinder forming bore I2 enlarged at
opposite ends to form chambers I3'and I4. These
such aforesaid governing structures.
f n.
are closed by gaskets .and cap plates or heads I5
The chief feature of. the. present invention is
and i6 respectively. The_se heads adjustably
the accomplishment of said objectA by utilizing a
ityby introducing. “speedfdroop” by causing the
'mount in apertures I'I Vand I8, respectively, the
adjustable stops I9 and 21B respectively.
balanced valve and` `Aassociating therewith. the
powerpiston so the latter merely follows the valve
such that as the valve, moved either manually or
The flange II herein is shown provided with a
pressure. ñuid supply passage 2| preferably, but
not necessarily, connected to the engine lubricat
ing system and to the pressure side thereof.
by governor means, comes; to, res,t„.the. ppwerlpis
'ton also comes to rests'o that. anyïsurge or hunt
ing in the system must. originate, inthe -governor,
-forî the power piston only duplicates valvemove
ment.
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30
Y
Theadvantages of this unit' are first,z the >power
to move the valve lever is substantially nil, hence
the governor has. extremely littleV iwork. .to do,
vmaking'it possible for a Veryïsrn'all governor.' to r‘
lcontrol a lot of'useful work.> Second, the use >of »
this unit> need not be >confined to. governors.. For
instance, two vof these units placedat righ-tangles
to each other,.and'by employing afpendulum to
' control the valves, wouldfmake Ía neryjeilîective', .
low priced automatic stabilizerfor a. smallair- "
plane.. Another useiwould> beto assist. in the op
eration of steering very heavy trucks,that is .mov
ing the front wheels particularly when the truck
is not moving for ythen it is Valmost impgssiblegto
turn the steering wheel as is wellv known,"
other use is to move'v severallevers. in conjunc
The body Iû at one end has a transverse shaft
22 and at the opposite end the master or power
control shaft 23. Tc the appropriately exposed
.ends of' said shafts are secured levers 24 and 25
respectively.
,
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u By comparing Figs. 2 and 4, and same are in
tentionally so illustrated, observe that lever 25
Vin Fig. 2 Ais dependingly positioned, while in Fig. 4
'fit extends upwardly. While in Figs. 2 and 4 lever
25 is at the same end of shaft 23, note thatY the
other Vend'îßa of the power shaft is long enough
to accommodate 'lever 25 whenever it is desired
to mount saine to this end.
In like manner,- lever ,24 may extend upwardly
from and/or maybe mounted in either position
on the other end of shaft 22. Accordingly, both
levers mayr dependA on the same _side or opposite
_sides of. the. body, >may project upwardly on the
tion with the gear shift lever ony a. vehicle. @All
same. 4sidevor opposite sides of the body, or may,
the engine oil pressure lubricating system to uti,
>lize that power instead ofthe controllingforce
which as stated, may be quite small;y
maybe
universallyv
upon
adaptability
opposite sides
to any
ofthebody.
engine and its
that is required in any of these several uses is to Y on the vsame side, have one. depend yand the other
hook up the herein disclosed hydraulic booster to .tu O >project upwardly, or the levers, as last'mentioned,
' - Otherobjects, features and uses lwill beset
fcn‘thy more »fullyïhereinaften
c_ontrolis provided for.
'
'
~
.Lever l2_4 may be manually controlled, or gov
55 ernor'- controlled, Ythe control end leading to the
3
2,411,705
4
accelerator, hand throttle or the governor con
trol rod or lever as the lock lever in a centrifugal
governor of conventional type.
Lever d5 is the main power lever and for en
to the engine lubricating system sump, or may
be wasted in other types of installations.
Now, when the engine fuel supply is to be re
duced, from say full throttle (Fig. 3), the valve
48 is moved to the right enough to bleed off the
pressure fluid in chamber I4, same reversing the
flow previously described up to bore 21. However,
gine control purposes it is connected to the fuel
supply control of the carburetor or the like, or
fuel pump rack shaft of a Diesel engine for re
ducing or increasing the fuel supply to the en
the reduced end of the valve now forms with the
gine, and in accordance with the control imposed
bore 21 at the other end of the piston a discharge
by the lever 2Q.
10 channel by which the relieved fluid wastes to
Mounted in bore l2 is power piston 25. It has
`chamber I 3 for return, if desired, to the sump side
a central bore 2? therethrough, which Aat the
of the pressure supply. Note that piston move
power end is threaded as at 28 to mount the
ment, etc., is obtained by spring 36 becoming ef
member 2S provided with parallel> ears 3E) that
carrie-s a bridging across member 3l, the latter in
the position shown in Fig. 1 contacting the ad- _
instable stop 2o, thereby limiting clockwise move
ment of main power shaft 23 in the off power or
initial position.
Arm member 32 is adjustably
fective for such purposes since pressure supply
has .been cut olf and the pressure in chamber
I 4 is released.
As 'shown in‘Figs. 1 and 3 the return of pressure
fluid from chamber I3 is eiîected at 6I and under
no pressure. Since chamber I ¿l is the pressure
secured in rock-shaft 23 as at 315 and is locked 20 chamber and since leakage along shaft 23 would
in adjusted position at 35.
result in erroneous operation pressure, seals are
When the piston 25 is pressure moved to the
employed where vsaid shaft 23 projects through
left from the position shown in Fig. 1 and to
. the body. Herein said shaft 23, see Fig. 2, is
ward the position shown in Fig. 3, cross member
mounted in metal sleeve bearings 62 and locked
3l rocks or tilts shaft 23 and lever 25 in accord 25 against axial displacement by spring- ring retain
ance therewith. Member SI, arm 32 and shaft
ers 63 seating in grooves 5e in said shaft. The
23 are constrained at all times toward the posi
body shaft opening 65 is enlarged at 55 and the
tion shown in Fig. l by load spring 36. This
fluid pressure seal, including the nested inter
spring has one >end seated about projection 31
ñtting metal members 6l and 66 with shaft en
and bears against lever 38 carrying same. Lever 30 veloping sleeve 69 and encircling spring 1G, is
38 is secured at 39 to shaft 23, see Fig. 2.
seated in said enlargement and prevents pressure
_ An ear ¿i8 on the body adjustably supports
leakage along the shaft.
It is to be observed that the spring 36, shown
member lil, having projection and seat 4Z that
nests in and supports the other end of load
spring 36.
An arm ¿i3 has a reduced portion Ml seated in
cross bore Q5 in shaft 22. The projecting end of
as a part of ystructure in Figs. 1 to 4 inclusive,
35 may be omitted,V provided the control member
(not shown) to be attached to lever 25 is itself
portion ¿lli is annularly grooved at 45 and seats
a split locking ring fil'.
spring loaded.
As stated, initially herein, hunting or surging,
inherent in a mechanically connected servo-mo
In the central bore 27 of piston 26 is a valve 40 tor system, is eliminated. The other advantages
$8. It is annularly channeled at 49. It has a
previously mentioned are again called to atten
central bore 'ed that communicates at one end
tion. Furthermore, the power applied to the pilot
with cross `bores 5I and is open at its opposite end
valve has been as stated substantially negligible,
adjacent member 29 which serves to seal piston
while as much as twenty inch pounds of torque
bore 2l from high pressure chamber M. The
has been taken from the booster and applied to
channel 49 provides spaced lands 52 and 53.
the carburetor valve shaft with no change what
The enlarged end 5s of the valve 43 is link con
ever in engine regulation, so load and friction
nected as at 55 to the pilot arm ¿53. A light spring
up to a certain point means nothing, that is,
56 maintains a taut, but automatically adjustable ì
may be disregarded, wherefore no accommoda
connection between the valve and its operating
tion or compensation therefor need be provided.
arm, the full throttle or power position of which
While the invention has been illustrated and
is limited by adjustable stop i 9 as shown in Fig. 3.
described in great detail in the drawing and fore
The power piston 245 is annularly grooved at
going description, the same is to be considered
El. and this groove, for all positions of said piston
as illustrative and not restrictive in character.
is in free communication with the fluid pressure
The modiñc‘ation'described herein as well as
supply passage 2l . A cross bore 5B equalizes pres
sures and communicates with channel 49 in the
valve for all positions of the valve and power
piston.
The piston 2d includes four parallel passages 60
ES that at one end open on the pressure face of
piston 2S and each at the inner end communi
cates with a cross passage 66, which is sealed when
others `which will readily suggest themselves to
persons skilled in this art, all are considered to
be within the broad scope of the invention, refer
ence being had to the appended claims.
The invention claimed is:
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1. A hydraulic booster structure including in
combination a cylinder, a power piston therein
and movable between the ends thereof and hav
land s3 close-s same and is open to pressure when
ing a combined intake and exhaust therein ter
bores d@ communicate with channel 4Q,
65 minating at the pressure end ofthe piston, a
d When the latter occurs, pressure fluid is sup
valve means controlling the combined intake and
plied to chamber I @t and becomes effective upon
exhaust and slidably supported in said piston,
piston 2S to move same in opposition to spring 35
a fluid pressure supply to the cylinder intermedi
and to rotate .the power control shaft 23 in ac
ate the ends-thereof and arranged to supply pres
cordance with valve movement, for when the 70 sure to that end confronting the piston pressure
valve and piston have a corresponding position
face and controlled> by said valve means, a dis
land 53 closes bores dii and _the piston ceases
charge from theother end. ofthe cylindena dis.
movement. Observe that any piston-valve leak
charge from the piston,- to the cylinder said other
age is relieved by bore 5i?. Such leakage> enters
chamber I3 and is discharged as at 6| to return 75 end, said valve means connecting said-piston dis
charge to the combined intake and exhaust and
~ 2,411,705
5
disconnecting same, actuating means for the
valve means, and power applying means opera
tively connected to the power piston and oper
able in accordance with valve means movement,
the sole power for moving said power piston to
ward the valvev actuating means being the pres
sure fluid from said supply, the actuating means
including a pivoted lever, linkage between the
valve means and lever and yielding means con
straining said linkage and valve means toward
pressure supplying position relative to the first
mentioned cylinder end.
'
the actuating means including a pivoted lever,
linkage between the valve means and lever and
yielding means constraining said linkage and
valve means toward pressure supplying position
relative to the ñrst mentioned cylinder end.
3. A hydraulic booster structure including in
combination a cylinder,l a power piston therein
and movable between the ends thereof and hav
ing a combined intake and exhaust therein ter
minating at theA pressure end of the piston, a
valve means controlling the combined intake and
exhaust and slidably supported in said piston,
a fluid pressure supply to the cylinder inter
mediate the ends thereof and arranged to sup
ply pressure to that end confronting the pis
2. A hydraulic booster structure including in
combination a cylinder, a power piston therein 15
ton pressure face and controlled by said Valve
and movable between the ends thereof and hav
means, a discharge Vfrom the- other end Y of
ing a combined intake and exhaust therein ter
the cylinder, a discharge fromV the piston to
minating at the pressure end of the piston, a
the cylinder said other end, said valve means
valve means controlling the combined intake and
connecting said piston discharge to the com
exhaust and slidably supported in said piston,
a fluid pressure supply to the cylinder inter 20 bined intake and exhaust and disconnect
ing same, actuating means for the valve means,
mediate the ends thereof and arranged to sup
and power applying means operatively con
ply pressure to that end confronting the piston
nected to the power piston and operable in
pressure face and controlled by said valve
means, a discharge from the other end of
accordance withvalve means movement, the sole
the cylinder, a discharge from the piston to 25 power for moving said power piston toward the
valve actuating means being the pressure fluid
the cylinder said other end, said valve means
from said supply, a load spring, means connect
connecting said piston discharge to the com
ing the power applying means thereto for oppos
bined intake and exhaust and disconnecting
ing power means movement in one direction of
and power applying means operatively con 30 said fluid pressure» supply when communicating
with the first mentioned end of the cylinder by
nected to the power piston and operable in
said valve means, said load spring moving the
accordance with valve means movement, the sole
power means toward non-controlling position,
power for moving said power piston toward the
and'means adjusting the force of said load spring
valve actuating means being the pressure .fluid
from said supply, a load spring, means connect 35 means, the actuating means including a pivoted
ing the power applying means thereto for oppos
lever, linkage between the valve means and lever
and yielding means constraining said linkage
ing power means movement in one direction of
said iiuid pressure supply when communicating
and valve means toward pressure supplying posi
tion relative to- the first mentioned cylinder end.
with the ñrst mentioned end of the cylinder by
40
WALTER E. BENJAMIN.
said valve means, said load spring moving the
power means toward non-controlling position,
same, actuating means for the valve means,
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