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Патент USA US2409843

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ÜCÍ. 22, 1946. 4
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W1 A. EATON
1
2,409,842
FLUID PRESSURE CONTROL MECHANISM
Arrow/¿Vs
Oct. 22, 1946.
2,409,842
w. A. AEATQN
FLUID PRESSURE CONTROL MECHANISM
Filed July 5, 1944
3 Sheets-Sheet 2
l
INVENTQJR.
WiyîredÀEalbla.
BY
,gé/¿Mn ?
Oce. 22,` i946.
W. A. EATON
2,409,842
FLUID PRESVSURE CONTROL MECHANISM
Filed July 5, 1944
3 Sheets-Sheet 5
_ A Irak/vers
Patented Oct. 22, 1946
2,409,842
UNITED `STlòlTlîS PATENT -LOFF ICE
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.2,409,842
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v
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' FLUID PRESSURE CONT-RGL jMECHANISM
t‘Wilfred A. `~Eaton, gElyria, Ohio, assìgfnor Lto
Bendix-Westinghouse Automotive t
Brake
Company, Elyria, 0hîo, a .corporation QfDEla
Application suits, 1944, serial No. 543,564
>13 claims.
(ci.
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2
This invention .relates to, control `mechanism
and 4more particularly >to fluid Vpressure Aoperated
mechanism ¿for steering a vehicle.
it has previouslyV been proposed tto provide
power .operated mechanism for steering vehicles
and `.more particularly fluid pressure operated
mechanism wherein :the _energization of ia power
actuator lis ¿controlled ¿by means of .a >lost `motion
connection between the .steering Wheel oi v4the Avve
hicle‘and the road `,Wheels of the vehicle, but ¿dif
iiculty has been experienced on certain vehicles
equipped -with this type of mechanism due to the
fact that road shocks imparted to the road wheels
.of “the vehicle have tended to take up the .slack
in the )lost :motion connection with `-a resultant 15
energization of ,the :power ,actuator tending .to
_cause continuous or vauto-reciprocation of .the ac,
.tuator and of the road Wheels, more commonly
`theretoy;,Shellielec;tly„te prerent yor ¿minimize
auto-.reeiproeation er
-. i
erobieet ofthe :invention is te provide,
in »c
option with mechanism „of the above type,
means controlled »by pressure `»conditiQns »in _a 1re
eiproeating ilnidvmoter „ter control-lieg the :110W
of
pressure 'to r:the .control-valves of _the mo
ter and .for thus @govemíxrsihe speed of .recip
roeetionofçtheimoter.
,still durther ,object „Qi »the `,invention ¿is to epro
ride, Connection with .a `double acting vfluid ïme
tor tof the @above type, :means for, supplying suf
.ñcient fluid zfpressureitepermît :rapid operation of
the «device fender normal operating conditions,
and for `limiting .the supply ‘Lof Vfluid pressureldur
ine 'autofreçiproeationtorfmore rapid operation .to
substantial-ly Prevent «such «reciproeation _from
,Continuing
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known :as jshi-mmy, >and it is accordingly an object
i ,These @11d V„other Edesi-roble ohjectsandvieatures
of >the Vpresent ,invention to provide vmeans `for 20 of the invention will be @more lreadily `apparent
overcoming .this undesirable condition.
`when taken ¿in connection >-Wltli--the ,accompany
,It has :been .found ¿during experiments with
.ing»drawingswhereinztwo embodimentsoi the in
mechanisms of this type which ,employ a 4~double
ventionris illustrated. .It :is »te .fbe expressly un»
acting :iiuid :motor licor .turning the steering wheels
der_stood, however, that the drawings are em
in one `direction or "the other, that ¿during rapid 25 fnloyedwf rïpiiriloses .of ` ustratibn only, andere
reciprocation ¿of the piston of the fluid motor,
not designed las .a V_deñniti011 of »the limits -Of :the
invention, referer-lee :being -hadror this _pur-.pose to
the control vValves :for the motor ,are .unable .to
thetappendedaelaims.
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exhaust ñuid pressure ¿from the motor Awith suf
ñcient ¿rapidity to prevent „the >pressure from in.
i @In 4the :dra-wings, wherein :asimilar :reference
creasing `at 'the `same time on `both Lsides .fof the 30 characters -~denote ¿similar lparts throughout ,the
piston, <aridanother `object lof the :invention fis t0
utilize this -simultaneous increase .in »pressure on
vboth sides >`of :the piston ¿for .the purpose _of :QP
erating control Valve‘grmechanismito reduce ¿the
supplyof :fluid Apressure _to the ,control .valves of
the
Arrlotor to a ¿point `Where the ñuìdpres
Several views;
Y
Y
«Fia l, of `the »valve :mechanism l for
‘
pair fof control valves :for alternately «supplying
fluid :pressureitoonefend or `:the yother end of the
.fluid motor, ,a 'pair- of Yconnections each normally
operable tosupply huid-pressure from a lreservoir
toíboth of ‘the .control valves, together with >means 45
controlled Joy the spressure in‘lone end -or” the `>mo
tor :,for controlling 'the _flowvoof »íluid çpreS‘rSlll‘e
through. one of `theseconnections and the _pres
sure `in vthe :other fend >Vo_f the motor Á‘for controle
ling ¿the `>:flow ._of :fluid pressure ¿through-the `other 50
„
n
„hegsupplyfef ¿fluid pressure to "the
" `fendjfigxt ,of «fthe :mechanism :taken
vide, n in ¿a .mechanism ,of lthe ¿above type .having a
‘c
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ïFis.- .12 Vis te :partial »seccional view taken alone
`îlet.another .object :of the „inventionfis >to xpro
oftthesel-connections.
‘
lizin the presentfmventierl;
`sx1-.re'suimlytis insufficient to sustain the „reeiprwv
cation.
,
i rFîg. 1 :is :a :diagram-matie view. ¿partially in Sec
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of
er :operated »steering apparatus uti
n
s. and f
__ ..
diagrammatic Mew-.partially »insee
tíen, of ia .ower :steering mechanism »embodying
anctheríiorrnfef the-invention.
y
V,Refmins»toeFis- .ofthe dreWinsSas-Well as t0
Fig. .ill-fthe steering meehenismiillustrated Vthere
iniisfgerlerellygefwt txpeftdiselesedtintthe‘patent
to #Stephen `Yereelrl` ¿en__d t „Stephen Johnson, ,.Ir.,
No. Zzllilöl?tL-,defterl Qetober :22, 119,35, thecontrol
valve mechanism being substantially the samefas
thatishown int-Eig. 2 `el’ theîpatent‘andïthe,lever
age »mechanism i~f0r `operating»the .control valve
»Still ¿another -object »of the yinvention is ,to ` pro
vide, in a system of the above type having' `ation-
mechanism, although .differing in detail, Qbeing
adapteditoge?feet operation 4of l:the |control valve
ble :acting fluid .motor :and -a ¿pair .Loffcontrpl ~ valves
meohanismin ythe same Hrmanner as ythe leverage
mechanism ,ShOWlllìn "thegpatent ‘.AS shown .in
Eig.« f1` of the presentfapplication, ¿the v`power „op
erated mechanism „includes la v.steering «wheel .4
Afor,;alternately¿supplying fluid »pressure-to „one end
or :the ¿other _end of ìthe „fiiuid motor, mea-11S re
sponsive to ipressure conditions inthetwo endSuOf
the .zmotorgfor controlling thesupply -Qfflluid apres
mounted ¿on «the puppen end fof-a `rotatable ¿shaft ~ 5,
Surecfrom the msource to the >`:control valves ‘fior
the shaft Aloeinc)providerl atlits lower end :with 1 a
Worm@ adapted @te .engage a :Worm sector .1 hav
the; urpose :of fiimitìns :the supply tot íluid ipresfY
2,409,842
3
ing a lever 8 on its lower end and rotatably
mounted in any suitable manner on a` shaft Scar
»ried by the framework of 4the vehicle, not shown.
A tubular extension 39 serving to enclose the rod
36'is threadedly received Aby the piston and eX
tends to the left through a seal 40' provided in
4the Wall 4I of the cylinder, the right end of the
is such that on rota-tion of the steering wheel in' ~ >cylinder being closed by a cover plate 42. A con
a counterclockwise direction; as viewed bythe one; 's ;trol valverrrnechanism 43 comprising a pair of
identical control valves 44 and 45 is mounted on
crater, the sector and lever will be operated in a
clockwise direction about the shaft 9 to steer the «Y > the upper side of the fluid motor 33 as shown, the
The arrangement of the worm and worm sectorv
vehicle to the left, and will be'operated in the ¿op- `- f control valve ¿L44- being adapted to supply fluid
posite direction when the >steering‘wheel is ro l0' pressure tothe right end of the motor through
a passage 46, and the valve 45 being adapted to
tated in a clockwise direction for the purpose of
supply fluid pressure to the left end of the motor
steering the vehicle to the right. ï
f.
" ' `
The dirigible wheels of the vehicle, -notsl'1_0ïvvn,.
through ra passage 41. As shown in more detail
in Fig. 2, the control Valve is generally of the type
drag link lil having a pivotal connection II with 15 disclosed in the above referred to Vorech and
are connected in the conventional manne-rte a
vthe-lower endV of an'operating -lever I2, pivotally
mounted for rotation on >alsh'aftl I3 carriedon
Johnson patent. . Each of these :valves :isiad'apted
the framework of the vehicle, and a mechanical
arm 48 pivotally mounted on the valve mechanism
by means of a pivot pin 49, rotationtof the rocker
connection between the ïlever I2 and the l'ever 8
is eifected byl means of a connecting link I4 piv
otally connected to the lever I2- by means 'of a
pirr l5 and pivotally connected tov a valve operat
to` be selectively operated byïmeans 'offa .rocker
20 armnin a clockwise direction being ‘adapted vto
operate‘the valve 44:, 'and rotation' in the other
- Idirection being adapted to voperate the valve 45,
operation of the rocker arm by movement ofthe
ing lever I6 by means of a pin I1, the lower end
lever .I6 being accomplished by means >of a; lever
of the valve operating leverbeing connected with
thelever 8 by‘means of a connecting rod I8y having 25 50 formed on the Varm and connected withfthe
valve operating rod 32 byvmeans of a universal
a universal jointy connection I9 with the leverfIS
joint 5I. Each ofthe vvalve mechanisms44. >and
‘and a universal joint connection 20 vwith the lever
8. ’ The lever 1:6> Vis supported on afpivot pin `2|
'45 includes a normally open exhaust valve 52 ‘and
normally closed inlet valve 53. `Each ofthe latter
'carried by a lever 22 mounted for free rotating
movement onga shaft 23 rigidly mounted on the 30 valves is resiliently urged againstfa >seat 54 by
frame, the 'arrangement-of >the lever and shaft
being more fully illustrated in'lï‘ig.- 2. AAs shown in
Fig. 2, the upper end of the lever I6 is provided
with a hubiportion 24 having an 'l enlarged bore
25" in -'spaced relationship with the vsurface of a
portion 26 ofthe shaft> 23,'and the llevers 22 and
'I6 are maintained on lthe shaft "23V between a
shoulder 21 formed thereon and a washer 28
retained on" the end of the shaft by means of a
suitable nut- 29; vrll‘hus the lever I61is so supported
asto permit the enlargedbore 25 tonnormally as
sume a concentric relationship with >theshaft
portion 26, it thus being apparent that'on move
meansfof a spring 55.
The exhaustvvalves' are
adapted to cooperatefwith seats 56 ïformed-‘on
pistons 57 slidably received in cylinders 58 formed
yin the ‘control valves, the pistons being ‘normally
urged upward by means of springs 59. Valve ac- Y
tuating stems Eil are slidably mountedin cover
members 6l carried on the control valves andare
directly connected or integrally formed with the
pistons 51. Each of the valves 44 and 451s pro
vided with an inletl and supply'conne'ction 62,
the valve 44 being provided with van routlet cham
ber 63 and the valve 45 being provided withan
outlet 4 chamber 64.
With.V the ' exhaust valves
rnent'ofv the lever lßin' a clockwise direction about
inthe position shown, these chambers are con-f
the pivot pin I1, -the hub portion of theïlever- will
nected with atmosphere through" passages 65
tend toumoveto the right until the- leftside of
the enlarged bore engages the‘- left side of the
sage 66 provided with an exhaustport 6l'. » Thus
formed in the pistons and a common exhaust pas-l
shaft portion 26. n As soon- as this engagement oc-`-
onclockwise operation of the rockerarm to move
I'one ofthe plungers 60 downward,.the exhaust
50 valve ofthe valveV 44 is closed andthe inlet valve
'connecting rod '318 ' byjy the steering »mechanism
is opened to admit fluid pressure» to"-1the'fóutl‘et
described, Will canse`> >the lever to pivot’ïabout the
chamber 63, while on operation ofthe rocker arm
line of engagement between the surface ofthe
in the opposite direction, the plunger 6I) `of'the
curs, further movement ofv the lever~v I6» in »fthe
same direction fdueto' continued operation of the
enlarged bore and the surfaceï‘of the shaft por
valve 45 is moveddownward'to` closefthe exhaust
tion 28, and the movementíof I'the leverïwill ac’
valve and open theinlet valve to admit fluidpres-w
sure-"to the-outlet chamber` 64. As ’indicated in'
vcordingly be imparted to the» lever I2 through the
connecting rod I4,"`wit_h >-thelresu‘lt that'the’drag
FigfZ and alsoshown in"Fig.î 1, the 'outlet cham
link Ill will be moved tothe left to `steer the vehicle
bers 63 and 64 are connected respectively~ with
mechanically in that directiong'g--Thus the »lever
the pass'agesvMìA and ‘il-leading to the right and
I 6i is vpern'iitted Y -to' lrock "through" av -limited »arc 60 left ends of the cylinder,> the valvet44 thus serving
in either direction'about the pivot Vpin ¿I 1, and this
to control the pressure of fluid in'the right end
movement is utilized to operate control mecha
of the cylinden'while the valve 45 serves to con’
nism for a power actuator connected withï the
trol the pressure in the ‘otherend of the cylinder.
leve'r_I2.`
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The»V right and left inlet passages 62 of> thevalve
The hub '24- of thelever I6,~` as shown inAFig. 2, 65 mechanism are connected‘by means ‘of a vconduit
isprovided with aïportion 3U adapted to receive
68 which is adapted to receivefluid pressure‘from
a ring Imember 3l rotatably mounted thereon,- and
a supply reservoir l69 through means to be .herein-Y
the ring member is provided with a valve'operat-V
ing rod,32 for operating the valve mechanism;
_ `In steering mechanisms of this't'ypaïthé .reserä
after
- As shown in Fig. 1, a double acting ñuid motorl33
is provided having a cylinder 34ïand a piston
35 slidably mounted therein,"a connecting rod
3ägpivotally’connected withthe piston by means
described.
»
-Y
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»f
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«
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ÍS
voir is normally directly connected with the-inlet
ports of the control valves, but in the presentin
stance,v a control valve mechanism "I0 is inter'
posed-betweenthe reservoir and thefconduit` 6'8
of> a pivot pin‘31 being connectedï’at its leftend
leading to the valves 44 and 45, this valve mecha
with the lever l2 by 'means -of -a Vpivot pin Á38. 75 nism being provided with an inlet port ‘H y connect
5
2,409,842
ed with the reservoir 69 through a conduit 12, and
andfluid pressure is supplied to both of the cond~
an outlet port 13 connected with the conduit
68 by means of a conduit 14. A‘pair of iluid re
ceiving-passages 15 and 16 are formed in the
valve mechanism lilas shown and both connected
to the inlet port 1I by means of a passage 11,
trol Valves 44 and 45 from the reservoir through
conduit 12, inlet port 1I, passage 10, passage 16,
bore "i8, passage 19, outlet port 13', and conduits
14 and 68, it being apparent that in the event
both of the valves 80 and 8| are simultaneously
the‘ce'ntral portions of these passages being con
closed, or partially closed, the supply of fluid
nected by means of a bore 18 Which is connected
with the outlet port 13 by means of a passage 19,
pressure to the valves 44 and 45 will be substan
16 are connected by means of a common conduit
valves on the cylinder, to supply the power neces-‘
tially reduced, with the result that insuiîicient
it thus being apparent that both passages 15 and 10 iluid pressure may be supplied to the control
sary to` sustain auto-reciprocation.
12‘ with the reservoir 69, and are both connected
through passage 18, passage 19 and outlet port
Assuming for example that the lever 8 is
13 with the valve supply conduit 68 through a
moved in a counterclockwise direction to steer
conduit 14. A valve 8l) slidably mounted in the 15 the vehicle tothe right, the lever I6 will be ro
valve‘mechanism 1B is adapted on movement to
the left to close the right end of the bore 18, a
tated about the pivot I1 in a counterclockwise
direction by virtue of its connection with the
valve 8| similarly mounted .in the left end of the
lever 8 through the connecting rod I8, and the
mechanism 1€)Y being adapted on movement to the
hub portion 24 will be moved to the left until
right to close the left end of the bore 18. The 20 the right’wall of the enlarged bore 30 contacts
mechanism 'lil is provided-at the right end with
the surface of the shaft portion 26, thus serving
chambers 82 and 83 separated by means of a flex
to move thev valve operating rod 32‘ to the left
ible diaphragm 84, the central portion of the
to impart counterclockwise rotation to the rocker
diaphragm being suitably clamped to the valve
arm 48 as viewed in Fig. 2. When this occurs,
member 80 as shown, with a spring 85 interposed 25 the plunger 60 of the valve 45 will be moved
between a portion of the mechanism and the dia
downward to close the intake valve and open
phragm serving to normally maintain the Valve
the exhaust valve, whereupon fluid pressure will
in the open position shown. In like manner the
be supplied from the reservoir to the left end of
left end of the mechanism is provided with cham
the cylinder through conduit 12 inlet port 1|,
bers86 and 81 separated by means of a diaphragm 30 passage 11, passages 15 and 16, bore 18, passage
88` connected with valve 8 l, and a spring 89 serves
19, port 13, conduits 'i4> and B8, inlet port 62, open
tomaintain the valve 8| in open position under
inlet valve 53, outlet chamber 64, and passage A41,
normal operating conditions. Thus with the parts`
thus forcing the piston 45 to the right to impart
in--the position shown, the inlet and outlet ports
counterclockwise rotation to the lever I2 by vir
'il and 13 are connected through both of the pas 35 tue of its connection therewith through connect
ing rod 36, thus moving the drag link I0 to the
sages 15 and 16, and in the event one of the valves
88 and 8l is closed, the passage not closed by one
right to turn the dirigíble wheels of the vehicle
of the valves will serve to permit the continued
to steer the vehicle to the right. As the pressure
flow of fluid pressure- from the reservoir tothe
increases in the left end of the cylinder, the pres
control valves of- the fluid motor.
40 sure will likewise increase in the chamber 81- of
‘ As >heretofore stated, steering mechanism of
the above type have a tendency toward auto-re
ciprocation, the power necessary to maintain this
reciprocation being supplied from the iiuid pres
sure reservoir, and during such reciprocation, it 45
has been found that the valvesf44 and 45 are un
able to exhaust `iiuid pressure from the cylinder
34 with sufficient rapidity to alternately reduce
the valve mechanism 10, and when this pressure
is sufficient to overcome the tension of the spring'
89, the valve 8| Will be moved to the right to
close the left end of the bore 18 in order to pre
vent further communication between passage 11
and the bore 18 through the passage 16. The
passage 15will be still effective, however, to per
mit the flow of iluid pressure to the conduit 14
thefpressure in one end or the other of the cylin
and to theicontrol valves through the right end
der to that of the surrounding atmosphere, and 50 of the bore 18, andthe mechanism is so adjusted
that during normal operation of the steering
» as reciprocation continues, there is a tendency for
mechanism, one of the valves 80 and 8l will al->
ciable degree, due to the fact -that the valves
ways be in open position in order to insure a
have insuihcient capaci-ty to handle the large
supply of fluid pressure to the control valves 44
volume of fluid being utilized in sustaining the 55 and 45 suflicient to elîect eiìicient and satisfactory
operation of-i the steering mechanism. In the
reciprocation. As indicated hereinabove, this
event auto-reciprocation of the piston 35 oc
action is utilized to control ‘mechanism `for con
trolling the supply of ñuid pressure tothe con
curs, however, the valves 44 and 45 will be rapidly
trol valves-44 and 45, and to this end, the pas
operated alternately by movement of the rocker
sage 46 leading to the right end of the cylinderv 60 arm48? to rapidly supply iiuid pressure to the
is» connected tothe chamber 33 of the valve
cylinder and to exhaust fluid pressure therefrom,
mechanism 'I8 through a conduit 98, whîle-the
and `due to the rapidity of the reciprocation,
passage 47 leading from the control valve 45 to
neither end of the cylinder is completely eX
the left` end of the cylinder is connected with
hausted ofV ñuid pressure, with the result that
the chamber 81v through a >conduit 98a, it being 65 the pressure gradually increases in both ends of
noted iin this connection that the chambers 82
the cylinder to a value` sufficient to move the
and B5 are at all times Vented to atmosphere
diaphragms 84 and 88 against thetensionfof' the
through ports` 9i'. Thus when iluid pressure is
springs’ 85 and 89 to simultaneously close or par
supplied to the right end ofthe cylinder, this
tially close both of the valves 88 and 8|.` This
pressure is likewise conducted to the chamber 70 action occurs almost instantaneously when the
83 and serves to move the diaphragm 84 to the left
auto-reciprocationof the piston 35 is initiated,
tol move the valve 89 to closed position, but in
and as a result of the closing or partial. closing
view of the fact that the left end of the cylinder
ofthe valves in 'response to the simultaneous in-`
is at atmospheric pressureduring this ltype of op-crease of pressure in both ends of the cylinder,
eration, the valve 81 remains in open position, 75 the supply of fluid pressure-from the reservoir to `
this residual pressure to increase to an appre
'2,409,842
8
both of the control valves through the passages 15
conduit‘14 is governed by the choke. Thesize
and .16 and the bore i8 is either substantially
reduced or entirely cut olf until such time as the
pressures in the ends of the cylinder and in the
' of >fluid pressure to the control valves to a value
chambers 83 and 81 drop sufliciently to permit
»reciprocation ' In this connection, it is pointed
ofthis choke isk so vchosen as t0 limit the supply
slightly less than that required to sustain auto
out that chokes have previously been utilized for
by the operation of ythe springs 85 and 8D. Dur
this purpose, but that in most cases thesechokes
have been interposed in the passages 46'and 41
ing normal operation, however, operation of the
adjacent the cylinder. The use of chokes in this
valve44 to supply air to the right end of vthe
cylinder causes pressure to be „supplied to the 10 manner has been of material advantage in mini
mizing or eliminating auto-reciprocation, but at
right end of the valve mechanism 10 to close
the valves 80 and 8| to be moved to open position
the valve 80, but on operation of the rocker arm
to operate the valve 45, in‘response to reverse
operation of the rocker arm when the steering
the same time 'has so limited the supply of ñuid
pressure to the cylinder as to prevent the latter
fromv supplying the necessary amount of power
wheel 4l is turned Vin the opposite direction by
the vehicle operator, the speed of operation is
to insure suñlciently rapid operation of the steer
ing mechanism when the steering wheel is turned
suchas to permit the valve 44 to exhaust the
by the operator. Due to the location of the
right end of the cylinder sufficiently to permit
choke as shown between the main reservoir and
opening of the valve 89 in the valve mechanism
the auxiliary-reservoir, it will be readily appar
19 before the pressure of fluid in the left end of 20 ent that the relatively small `auxiliary reservoir
>the cylinder and in the chamberfß'l is sufficient
supplies suñîcient fluid pressure to permit the
toclose thevalve 8|, the result being that dur
cylinder to supply the necessary amount of pow
ing this type of operation, one or the other of
er t0 operate the steering mechanism when the
the valves 80 or 8| isalways open and iluid pres
steering wheel is turned Iby the operator of the
sure is supplied at all times to the inlet ports of 25 vehicle, but that during auto-reciprocation, when
both 'of the control valves44 and 45. When the
a continuous supply of fluid pressure is required
auto-reciprocation occurs, the operation is such
by the control valves and cylinder and the oper
that, as hereinabove described, both valves tend
to close or partially close at the same time, and
ation is much more rapid, the pressure in the res
ervoir 94 is rapidly depleted to a point Where the
the pressure at which such closing of both valves 30 flow of iluid pressure to the control valves is gov
occurs can be `readily adjusted by properly pro
ernedentirely by the choke 93, and it is thus pos
portioning the areas of the diaphragms and the
sible to choose a choke size and auxiliary res
characteristics of the springs 85 and 89, these
_ervoir size which will prevent auto-reciprocation
being preferably adjusted in such amanner that
and which at the same time will- supply sufficient
simultaneous closing of both valves will occur 35 -ñuid pressure to maintain a normal working
when vthe pressures on both sides of the piston
pressure in the auxiliary reservoir during opera
35 exceed atmospheric pressure at the same time
tionof the mechanism at normal speeds.
s
by a predetermined- value.
Y
'There has thus `been provided in the present
. Referring now to the embodiment of the in
invention, as illustrated in the embodiments
vention shown in Fig. 4, it will 4be seen that the 40 shown more particularly in Figs. 1 and 4, simple
and eincient means for normally supplying suf
mechanism for controlling the steering of the
licient ñuid pressure from the main reservoir to
vehicle is identical to that shown in Fig. 1, the
the steering mechanism to insure satisfactory
difference being in the means utilized for sup
and unrestricted operation, together with means
plying ñuid pressure from the reservoir 69 to the
for automatically limiting the supply of fluid
inlet ports of the control valves 44 and 45. In
view of the explanation given in the preceding
pressure to a value which is insuiiicient to sus-_
tain auto-reciprocation of the -mechanism when
paragraph, it will be readily understood that dur
such reciprocation occurs or tends to occur.
ing normal operation of the steering mecha
nismA by operation of the steering wheel 4, the
While two embodiments of the invention have
averagerate at which fluid pressure must be sup
been illustratedand described with considerable
detail, it will be readily understood by those v
plied to the control valves to insure satisfactory
operation of the ñuid motor is considerably less
skilled in theV art that various changes, sub
than that required to maintain auto-reciproca
stitutions, and rearrangements of the compo
nent parts may be resorted to without departing
tion, and that through the inclusion of means in
the fluid pressure supplyV system which4 is oper 55 from the spirit of theA invention. It is also to
ative to re-duce or Alimit the supply of fluid pres
be understood that the principles set forth may
sure Vto the control valves during auto-“recipro
be embodied in connection withV any suitable pow
cation, this reciprocation may be minimized or
er medium for effecting and controllingthe oper
substantially eliminated. Tothis end, fluid pres
ation of a fluid motor or power actuator. _Refer
sure is supplied rfrom the reservoir 69 to the con 60 ence will, therefore, be yhad to the appended
duit 14 leading to the control valves 44 and 454
claims for a definition of the limits of the inven
through a «conduit 92 provided with a choke or
restricted portion 93 and an auxiliary reservoir
What is claimed is:
i1. Mechanism for controlling the supply of
94, the capacity of the auxiliary reservoir being
tion.
'
'
'
suñîcient to insure satisfactory operation ofthe 65 fluid pressure from a source ,to a double acting
steering gear cylinder during a normal >steering
flui-d motor of the type having a pair of con
operation to the left or right of the straight ahead
trol valves and a control elementvfor operating
said valves to alternately supply iluid pressure
position, but being insuiñcient to sustain auto
to one end or the other end of said motor, said
reciprocation of the mechanism. In other words,
as'soon as auto-reciprocation starts, the pressure 70 mechanism including a pair of connections eachv
adapted to connect the source with both valves,
in the auxiliary reservoir is »materially'reduced
and means responsive to the pressure in one end
due to the additional fluid pressure required to
of the motor for closing one of said connectionsA
sustain this auto-reciprocation, andthe rate of
and responsive to the pressure in the other endl
feed of fluid pressure to the control valves 44 and
45 through conduit 92, choke `§33, reservoir 94 and 75 of the motor for closing the other'of said con--`
g,409,842
10
nections when said pressures reach predeter
mined values.
l
connect the source with both control valves, means
responsive'to thepressure in onefend of the motor
l
2.v Mecha-nism,- for controlling the supply of
for closing one of said connections when the pres
sure „in said one end exceeds va predetermined
value, andmeans `responsive to the pressure in
fluid pressure from a source to a double acting
fluid motor of `the type having a pairV of control
valves and a control elementfor operating said
valves to alternately supply fluid pressure to one
end or the other end of said motor, said mecha
other end exceeds ' a predetermined value.
nism including a pair of connections >each adapt
ed to connect the source with both valves, and
sure, a double acting fluid motor, ,valvel mecha
the `other end of the motorfor closing the other
of said connections when «the . pressure in said
7. rllhe combination with a source of fluid pres
means controlled by the pressure in the motor
nism operable‘to alternately `supply fluidpressure
for .controlling theflow of fluid pressure through
to one end or to the other end of said motor, `and
said connections including a valve forclosing one
„of the »connections when the pressure Íin ‘one end
meansforîconnecting_said sourceand valve mech
‘of `the motor reaches a .predetermined value and »
a valve for closing the other connection when
the pressure in the other end of `Athe motor
reaches a predetermined Value.
3. Mechanism for controlling the supply of
anism, of means associated with said connec
tion means` controlled by the; pressure ‘in said
motor for reducing the flow of fluid pressure‘be
tween the source and valve mechanism when the
pressures in both ends of said motor exceed a
predetermined value at the same time including -a
ñuid pressure from ‘a source to a double acting 20 valve controlled by the pressure in one end of the
fluid motor of the type having a pair of control
valves and a control element for operatingV said
valves to alternately supply fluid pressure to one
motor and another valve controlled by the pres
sure in the other end of the motor.
'
8. The combination with a source of 'll-uid pres
sure, a double acting-fluid motor, valve mecha
end or the other end of said motor, said mech
anism including a pair of connections each adapt 25 nism operable to alternately supply fluid pressure'
ed to connect the source with both valves,`and
to one end or to the other end of said moto-r, and
valve means controlled by the pressure in Vone
means for connecting .said source and valve mech
end of the motor for controlling the flow 'of fluid
anisrn, of vvalve means associated with said conpressure through one of said lc‘onnections and
necting means for controlling the flow of fluid
controlled by the pressure in the other end of
pressure therethrough between said source and
the motor for controlling the flow of fluid pres
motor, said valve means including a pair of pas
sure through the other of said connections.
sages having a `common connection with the valve
4. Mechanism for controlling the supply of
mechanism and a common connection with the
fluid pressure from a source to a double acting
source, a separate‘valvefor controlling the flow of
ñuid motor of the type having a pair of control
valves and a control element for operating said
valves to alternately supply fluid pressure to one
end or the other end of said motor, said mecha
nism including a pair of connections each adapted
to connect the source with both control valves,
a separate valve for controlling the flow of fluid
pressure through one of said connections, means
responsive to the pressure in one end of the motor
for closing said separate valve when the rpressure
in said one end of the motor reaches a predeter
mined value, a valve for controlling the llow of
fluid pressure through the other of said connec
tions, and means responsive to the pressure in
the other end of the motor for closing the last
named valve when the pressure in said other end
of the motor reaches a predetermined value.
5. Mechanism for controlling the supply of fluid
A35 fluid pressure in" each'of said‘p'a'ssages, means
controlled by variations in the pressure of fluid
in one end of the motor for opening and closing `
one of said separate Valves, and means controlled
by variations in the pressure of liuid in the other
40 end of the motor for opening and closing the
other of said separate valves.
9. The combination with a source of power, a
reversible power actuator, control mechanism
operable to alternately energize the actuator for
45 operation in one direction or the other, and means
for supplying power from said source to said con
trol mechanism, of control means associated with
said supplying means for controlling the degree of
power supplied to said control mechanism, said
50 control means including means forming a pair
of power supply paths having a common connec
tion with the source and a common connection
pressure from a source to a double acting fluid
with the control mechanism, a power controlling
motor of the type having va pair of control valves
element for controlling the degree of power sup
and a control element for operating said valves 55 plied to the control mechanism along each of said
to alternately supply fluid pressure to one end or
paths, means responsive to the power supplied
the other end of said motor, said mechanism in
to the actuator to operate it in one direction for
cluding a pair of connections each adapted to
controlling the operation of one of said elements,
connect the source with both control valves, a
and means responsive to the power supplied to
separate valve for controlling the flow of fluid 60 the actuator to operate it in the other direction for
pressure through each of said connections, means
controlling the operation of the other of said ele
for normally maintaining said separate valves in
ments.
open position, means responsive to the pressure in
10. Mechanism for controlling the supply of`
one end of the motor for moving one of said sepa
power to a power operated device of the type
rate valves to closed position, and means resp-on 65 having a reversible power actuator and control
sive to the pressure in the other end of the motor
means operable to alternately energize the actufor moving the other of said separate valves to
ator Afor operation in one direction or the other,
closed position.
said mechanism including means providing a pair
6. Mechanism for controlling the supply of fluid
of parallel power paths for supplying power to
pressure from a source to a double acting fluid 70 the control means, means responsive to the power
motor of the type having a pair of control valves
supplied to the actuator to operate it in one di
and a control element for operating said valves
rection for controlling the degree of power sup
to alternately supply fluid pressure to one end or
plied to the control means along one: of said
paths,A and means responsive to the power sup
cluding a pair of connections each adapted to 75 plied to the actuator to operate it in the opposite '
the other end of said motor, said mechanism in
2,409,842
11
12
direction for controlling thedegree of power suD- y
plied to the control means along the vother of
regardless of the speed of Voperation of said valve
mechanism including a connection between the
source vand valve mechanism,` and'm'e'ans includ
ing a. pair of valves controlled respectively by the
said paths.
'
1l. Control valve mechanism for controlling
the supply of fluid pressure to a double acting
fluid pressure motor of the type having a pair of
control valves and an element for operating said
valves to alternately supply fluid pressure to one
pressures of the >fluid -in opposite ends of the
motor for controlling the flow of fluid pressure
through’said connection.
'
ì
'
`
' 13. Control --valve mechanism for controlling
the supply of fluid pressure to a double acting
end or to the other end of said motor, said valve
mechanism including a casing having an inlet 10 fluid -motor of the type having a pair of control
valves and means for operating one ofsaid valves
port adapted to be connected toa source of fluid
to supply fluid pressure to one end ofthe motor
pressure', an- outlet port adapted to be connected
and for operating the other of said valves to sup
to each of said control valves, a pair of fluid pres
ply fluid pressure `to the other end of the motor,
sure passages both connected with the inlet port
and with the outlet port, separate valves for cen 15 said control valve mechanism including a casing
having an inlet port adapted to be connected to a
trolling the flow of fluid pressure through each
source of fluid pressure, an' outlet port lhaving a
of said passages, means for normally maintaining
connection With each of said control valves, a’ pair
said valves in open position, a chamber adapted to
of separate fluid passages each connected with
be connected to one end of the motor, a chamber
adapted to be connected to the other end of the 20 the inlet and outlet ports, separate valves for con- _
trolling thel flow of fluid pressure through each of
motor, a member subjected to the pressure of fluid
said passages, a pressure responsive member sub
in the first named chamber for operating one of
jected at `all times to the pressure of fluid in one
said separate valves, and a member subjected to
end of the motor for closing one of said separate
the pressure offluid in the other of said cham
bers for operating the other of vsaid separate 25 valves, a pressure responsive member subjected at
all times to the pressure of fluid in the other end
valves.
of the motor for closing» the `other of said sep
12. The combination with a double acting fluid
arate valves, and separatesprings for normally
motor of the type having control valve mech
maintaining each of said separate Valves in open
anism adapted to supply ñuid pressure alternately
to opposite ends of -the motor to effect reciproca 30 position until the pressure of the fluid to which
eachV of -the corresponding pressure responsive
tion thereof at different rates dependent on the
members is subjected reaches a predetermined
speed of operation of the valve mechanism and
a source of fluid pressure for said valve mech
anism, of means for limiting the speed of recip
rocation Iof said motor to a predetermined value 35
value.
‘
WILFRED A. EATON.
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