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Патент USA US2411119

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7 Nov. 12, 1946.
2,411,119 '
Filed May 18, 1945‘
4 sbeQts-“shégt 1
Nov. 12, 1946.
Filed May 18, 194,37
4 Sheets-Sheet 2
WILLIAM T. s'mpmzlis
3%” (,5! , EM.
Nov. 12, 1946.
Filed may 18, 1943
4 Sheets~5heet 4
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Patented Nov. 12, 1946
’ 2,411.119' r’.
umrso srn'ras PATENT OFFICE
William T. Stephens, Cleveland, Ohio, assignor
‘to Hydraulic Control Engineering Company,
Cleveland, Qhio, a corporation 0! Ohio
Application May 18, 1943-, Serial No. 487,518
163 Qiairns. } _(Cl. Mir-d1)
Fig. 3 is a side elevation partly in central lon
gitudinal section taken on line 3-—3 of Fig. 2, of
the steering mechanism as a whole showing the
This invention relates to a hydraulically oper-_
ated steering mechanism, and more particularly
to a hydraulic steering apparatus for use on auto
motive vehicles, aircraft and boats, wherein a
conventional steering wheel is turned and a hy
draulic motor energized by the wheel for moving
the steering apparatus. A modi?cation of the
invention includes a dual steering apparatus
whereby the vehicle may be additionally steered
from a remote point.
An object of the invention is to construct a
steering wheel, integral reservoir and associated
,l valves and steering motor;
Fig. 4 is a transverse section taken-on line 4-4
Fig. 5 is a transverse section taken on line 5-5
of Fig. 3;
Fig. 6 _is a transverse section of the steering
motor taken on line 6-6 of Fig. 3;
Fig. '7 is a partial longitudinal section taken on
line ‘|_1 of Fig. 10, of the modi?ed steering con
compact and easily manufactured steering appa
ratus in which the hydraulic motor circuit for
operating the steering arm is of the closed system
struction for use with a remote operator;
Fig. 8 is a transverse section taken on line 8-8
of Fig. '7;
Another object of the invention is the utiliza
Fig. 9 is a transverse section taken on line 9—9
tion of a. conventional steering wheel having a
steering column provided with hydraulic ?uid
of Fig- 7;
Fig. 10 is a transverse section taken on line
chamber rotary "piston motor directly coupled 20 Ill-I0 of Fig. 7 showing the remote controlled
passages and ports for operating an expansive
with the steering shaft whereby the steering
wheel .is turned to permit high pressure ?uid to
enter the valves and energize the steering motor.
A still further object of the invention is the
follow-up ‘ mechanism
Fig. 11 is a transverse section taken on line
ll-H of Fig. '7, illustrating the hydraulic steer- I
. lng motor for the dual steering mechanism;
used 25
whereby when the steering wheel is turned to in
itially register the power ports of the ?uid valve
the ?uid thereafter rotates the steering shaft
through a hydraulic motor to provide follow-up
and stop the ?ow of ?uid.
?uid motor;
Fig. 12 is a diagrammatic layout of the dual or
auxiliary steering system showing the auxiliary
wheel with its ?uid conduits leading to the main
steering apparatus;
Fig. 13 is a longitudinalcentral-section 0f the '
30 remotely operated ?uid valve, taken on broken
An additional object of the invention comprises
the unique arrangement of the valving means for
line Iii-l3 of Fig. 14; and
Fig. 14 is a transverse section of the remote -
operator taken on line l?-ll of Fig. ‘.3.
As shown in Fig. 1 of the drawings, the steering
whereby both return ports are normally slightly
open when-the wheel is in any released position 35 mechanism comprises a closed hydraulic system
joined by suitable piping and includes a ?uid
whereby the normal castering action of the steer
pressure power driven pump I connected to an
ing wheels will return then to the straight ahead
accumulator 3 and leading to the steering‘ appa
position in exactly the same manner as happens
ratus per se 5. The preferred embodiment of the
in straight mechanical steering when the steer
steering gear comprises a manually rotatable
ing wheel is released.
steering wheel 1 provided with spokes 8 attached
A further object is the combination with the
to a ?anged cylinder 4 I having an extended cylin
main steering apparatus of a remote control
drical skirt portion I3 surrounding the upper end
steering wheel whereby the vehicle may be guid
controlling the return ?uid from the - motor
of the centrally arranged steering shaft [5.
ed from'a remote point.
In the drawings Figs. 1 to 6, inclusive, illustrate I The outer end of the rotatable shaft i5 is bolted
to a radial arm it having a transverse extension
the‘ steering apparatus and steering wheel con
i9 secured to the outer end thereof. Spring re
trol, together ‘with the ?uid pressure system for
turn cylinders 2| are pivoted to the outer ends of
operating a steering apparatus. while Figs. 7 to
the transverse member H with each cylinder 2i
14, inclusive, illustrate the modi?ed form of ap
paratus where a duel control of the main steering. 50 provided with an outwardly extending piston rod
23 pivotally secured to an adjacent steering wheel
wheel is provided.
spoke 9. The inner ends of the piston rods 23
In the drawings:
are slidably recessed in close ?ttingiiores in bush
Fig. 1 is a diagrammatic layout of the closed
?uid system;
loss 25 of the same diameter as and slidable in
Fig. 2 is a plan view of the steering wheel with 55 the major portion of the bores of the cylinders 25
and the ends of the cylinders through which the
its associated return mechanism;
piston rods 23 pass are closed by screw blocks 21. ’
Lying between the inner faces of the screw blocks
21 and the bushings 25 are compression springs
29. Reduced bores at the inner ends of the cyl
inders provide accommodation for the ends of the
rods 23 when they slide through the bushings
The longitudinal bores 39 and 4| extend to
the mid portion of the hydraulic expansive cham
ber rotary piston motor 41 shown in detail in
Fig. 6. This motor comprises a sleeve 85 splined '
,to the shaft IS with a radial-piston 81 formed
on the sleeve for close working engagement with
the inner wall of the motor housing 41. The
sleeve 85 is of smaller diameterexcept through
which are stopped by shoulders at the junctions
of the cylinder bores. Snap rings on the inner
ends of the rods engage and move the bushings
the piston portion than the inner diameter of the
when the rods are withdrawn from the positions 10 motor casing and the space defined therebetween
forms ?uid chambers 89 and 9| on opposite sides
as shown. It will be obvious that when the ‘steer
ing wheel 1 is .turned one or the other of the
of the piston 81. The two chambers 9| and 89
springs 29 will be compressed and thereafter if
are separated by piston 81 and by land 93 ex
tending from housing 41. As shown, the longi~
the steering wheel is released the spring return
mechanism will rotate the steering wheel in the 15' tudinal bores 39 and 4| continue radially by
opposite direction to that which it has been
means of passages 95 and 91 respectively through
turned and thus return the steering wheel to a
shaft I5 and rotary sleeve 85 on oppositesides
neutral position where steering action ceases. .
of the piston 91 to communicate with chambers
The center steering shaft or column l5 extends
9| and 89.
throughout the length of the apparatus and ter 20 Similarly, radial ?uid passages 93 and 99 ex
minates in a suitable steering arm 3| vto which
"the device to be controlled may be suitably con
nected for imparting movement thereto.
Referring again to the shaft I5, it will be ob
. tend from bores 39 and 4| respectively in the
high pressure ?uid control valve section for con
trolling the ?ow of ?uid from ‘passages 'H'Llld‘
13 connected to the annular passage 89 while
served that the portion of the shaft adjacent the 25 in the low pressure exhaust section the bores 39
steering wheel is longitudinally bored to provide
and 4| are radially extended through passages
a pair of spaced parallel ?uid passages 39 and
I90 and |0| respectively whereby low pressure ‘
4|. These spaced ?uid bores 39 and 4| are con
?uid may be exhausted through passages 19 and
nected with a plurality of radial passages which
8| to annular passage 83 and thence through ex
form the ?uid control valve for this device, as will 30 haust port 15.
e -
be hereinafter described. As before stated, the
The system is ?lled with hydraulic ?uid by
control valve section of the steering shaft [5 is
encompassed within the cylindrical skirt l3 at
maintaining a supply of fluid in the enlarged
chamber 5| that encompasses the lower end of
' tached to the steering spokes 9 and surrounding
the steering shaft |5. The hydraulic ?uid may
the skirt I3 is a ?xed cylindrical sleeve 35 hav 35 be introduced into the reservoir 5| through open
ing an end ?ange 43 abutting a centrally aper
ing |83 while the ?uid passes into the, system
tured plate 45. " The plate 45 holds one end of
' through exit port I05 connected by pipe line I01
a hydraulic motor casing 41 within an annular
leading to the pump.
groove 49, while the opposite end of the motor
In operation, if the steering wheel 1 and its
casing 41 is similarly held by an apertured plate 40 associated skirt !3 are rotated clockwise. ?uid
58 and this whole assembly is bolted to the end
passages 13 and 19 will be brought ‘into com
. of a reservoir or tank 5|. The steering shaft I5
munication with passages 98 and IM and as a~
is suitably mounted in anti-friction bearings 53
result H. P. ?uid will ?ow from H. P. inlet 51
positioned in the plates 45 and 50 with the outer
through passages 59, 13,98, 39 and 95 to cham
end of the shaft passingvthrough the end of the 45 ber 9| where it acts to rotate steering motor
reservoir or casing 5| mounted in an antifric
members 85 and 81 in 'a clockwise direction.
tional bearing 55. The end projection or shoul
Since part 85 is securely fastened tosteering
der_51 holding the bearing 55 is provided with
shaft l5 this shaft and its associated arm 3|
suitable packing 59 to prevent the leakage of hy
will also be revolved in a clockwise direction to
draulic ?uid therefrom, and it will be understood 50 accomplish steering. ,Simultaneous with the
that all other joints subjected to fluid pressure
above, L. P. ?uid will be caused to exhaust from
are also furnished with conventional packing.
chamber 89 to L. 1?. exit port 15 by means of pas
sages 91, 4|, |9|, 19 and 83 while passages 99 and
High pressure ?uid from accumulator 3 flows
I09 are completely blocked by- skirt l3, tlus con
through piping 55 to the inlet port 61, Fig. 5, and 55 ?ning the movement of the ?uid to the above~
thence into the annular passage 69 formed in the
described circuits. In a like manner if the steer- .
inner face of cylindrical sleeve 35. This annular
ing wheel isv rotated counter-clockwise,‘passages
passage ‘69 communicates with oppositely posi
13 and 8| are brought into communication with
tioned radial passages 1| and 13 formed in skirt
passages 99 and H10 and H. P. ?uid will ?ow from
l3v with the inner ends of the passages enlarged
inlet port 61 through passages 99, 13, 99, 4| and
' to form arcuate chambers adjacent the periphery > 91 to chamber 89 where it will act to rotate parts .'
of the steering shaft I5. The normal or neutral
85, 81, I5 and 3| in a counter-clockwise direc
position of these connecting passages is shown
tion. L. P. ?uid from chamber 91 will be ex
in Fig. 5 of the drawings.
hausted back to L. P. outlet .15 via passages 95,
'Adjacentthe steering wheel end of sleeve 35 05 39, I98, 8| and 83. Skirt l3 now blocks passages
is the low pressure or discharge port 15, Fig. 4,}
98 and llll’to confine the ?uid ?ow to the cir
joined by piping 11 leading back'to the pump
cuits just described.
Passage 1i diametrically
| or tank 5|. Fluid pressure passing through
opposite to passage 13, while not having any part
longitudinal bores 39 and 4| from the high pres
in the hydraulic circuits just described, does have
sure valve section heretofore described will dis 70 a very definite‘ function in the assembly in that
charge into oppositely positioned discharge pas
_ it forms the balancing means between shaft I5
and sleeve Or skirt l3, thereby preventing bind
sages_19"'0r8| through radial passages |||0 orv
ing between these two parts.
I101‘ and ‘thence into annular passageway‘ 83
The enlarged portion of passage 13 does not
formedhihn" sleeve 35 whereby the fluid may flow
76 quite span the distance between passages 98 and
outwardly through outlet 15.
99, hence wheel ‘I and skirt l3 must be moved
a slight amount in either direction from the neu
_.tral position shown before the H. P. circuit to
accomplished, wheel 1 may be reversed in direc
tion with a resulting reversal of direction in
steering which results in bringing the vehicle
wheels back to their normalv position. In con
motor chambers 89 or 9| is opened. It will also be
noted that in the neutral position shown pas
ventional steering, if the operator lets go of the . _
sages 79 and 8| are‘in communication with pas
steering wheel the caster of the steered wheels
sages IM and Hill respectively. The slight rota
returns them to their normal straight-forward
tion required of wheel 1 before valving of the
position; This result is duplicated in the de
H. P. ?uid occurs provides the play ordinarily
scribed assembly in the following manner. If
found in a conventional type steering wheel and 10 the operator lets go of the steering wheel after
shaft. ‘One purpose of this play is to prevent
the ‘vehicle wheels have been turned, the de
slight movements of said steering wheel from
pressed spring 29 of one of the cylinders 2| acts
being transmitted to the vehicle wheels, thus pre
to return wheel ‘I to its neutral position in rela
venting wandering. Play in the steering wheel '
tion to shaft l5. This shuts on circulation of
also allows for slight movement of the vehicle
the H. P. ?uid to the steering motor and would
wheels without corresponding movement of the
result in the vehicle wheels remaining in their
steering wheel. Thus steering wheel ?utter as ‘ turned positions were it not for the caster which
a result of uneven terrain or road shock is elimi
acts to return these wheels to their normal posi
nated. The overlapping of passages 19 and illll
tion. When this occurs arm 3|, along with shaft
and 8| and H30, along with the overtravel of 20 i5, is‘ returned to its neutral position carrying
wheel 1 as made possible by the arrangement of
wheel 7 and skirt l3 along with it. This return
passages ‘l3,v 98 and, 99 accomplishes this latter
to neutral is possible because of the arrangement
purpose in this invention. Road shock which
of‘ passages 79, 8|, "l0 and NH which allows
would tend to cause movement of arm 3| and
transference of liquid from one of the chambers
shaft l5 would also tend to rotate parts 85 and
89 or 9| to the other when skirt I3 is in its neutral
81 of the steering motor. Such movement of parts
position in relation to shaft l5.
85 and 81 would cause ?uid to be expelled from
If the H. P. source of the hydraulic system
either chamber 89 or 9|, and since these cham
should fail, the vehicle could still be steered man
bers are in communication with each other by
ually, as noted previously.
This is possible be- _
means of passages 91, 4|, NH, ‘59, 83, 8|, Hill, 39 30 cause of the arrangement of passages 19, 8|, I00
and 95 fluid would be expelled from one or the
other of said chambers and allowed to pass to
the other. As a result, shaft l5 may rotate a
and ml, which allows exhausting of the ?uid in
chambers 89 or 9.! to LP. when wheel ‘I, skirt
i3, shaft I5 and motor parts 85 and B1 are ro
limitedamount without a?ecting the wheel '5.
tated manually as a unit.
Any tendency‘ of shaft IE to rotate more than a
Since the above arrangement oi.’ passages elimi
limited amount as a result of road shock is coun
nates the possibility of a hydraulic lock occur
ring in ‘the steering motor 'and the arrangement
teracted when the shaft has moved enough to
bring either passage 98 or 99 in communication
of spring cylinders 2|, steering wheel 1' and shaft
with passage 13 thereby allowing H. P. ?uid to
it allows for coordinated movement between
enter eitherv chamber 9| ortil and oppose such 40 wheel 7 and shaft l5, itshould be evident that
emergency manual steering can be accomplished
The amount of relatively free movement‘ of
with only minor inconveniences, namely, more
wheel ‘l is governed by the stroke of the spring
physical effort ‘on the part of the operator and .
cylinders 2|. This stroke is such that it only
slightly more play or free movement of wheel 1
allows for enough free movement of skirt i3 to
register passage 13 with either passage 98 or 99
to accomplish power steering. Further rotation
of wheel 1 beyond the free movement point is
possible but results in shaft i5 being moved by
the wheel to accomplish manual steering. Since
the physical effort required to steer the vehicle
manually is much greater than for power steer
ing, manual steering is reserved for emergency
only and will be discussed later. The arrange
ment of cylinders 2| makes possible the same
type of governed steering as would be had by
before actual steering is produced.
In the modi?ed form of the invention disclosed
‘in Figs. 7-14, inclusive-the apparatus as hereto
fore described is provided with an additional or
dual steering wheel 200 located at some distant
point. This remote operating wheel 200 is di
rectly connected to an auxiliary motor operator
illustrated in Figs. 13 and 14 of the drawings,
whereby ?uid is forced through a suitable piping
system to an auxiliary steering wheel motor
added to the master steering wheel control previ
ously described.
means of a conventional steering wheel arrange
Fig. 7 is an enlarged view of the modi?ed main
ment. Note that as soon as wheel ‘l and skirt
steering wheel which is identical to the form of ‘
l3 have been revolved sufficiently to take up the
. steering apparatus shown in Fig. 3, with the ex
overtravel or play, either passage 98 orv 99 is 60 ception that it is provided with an auxiliary or
brought into communication with passage ‘I3
secondary remotely operated ?uid motor 2|0.
with resulting power steering, which results in
This auxiliary operating or steering wheel mo
' rotation of shaft IS in a direction which tends to
tor is positioned between the ?anged cylinder
shut off communication between the passages just
53 and the side plate 45 and comprises a side
brought into register. It should be apparent then 65 plate 222 abutting the valve side plate 45, with a ~
cylindrical motor casing clamped between it and
that continued movementof wheel ‘I to keep pas-_
sage 13 in register with either passage 98 or 99
is required to maintain steering, for just as soon
as movement of wheel ‘I is stopped, shaft l5 will
catch up, passage 98 or 99 will‘be taken out of,
register with passage 13 and steering will be
stopped. This continued movement of wheel ‘I
to accomplish continued steering gives steering
control similar to the conventional type.
the ?ange 43 by the bolts which fasten the whole '
assembly to the fluid reservoir 5|. As seen in
Fig. 10 the cylindrical casing 2 In of the secondary
motor is provided with inlet‘ and outlet passages
ills and 2|B, respectively, with the inner ends
of these passages communicating with the two
arcuate chambers 2|8 separated by ‘the bottom
‘ abutment 220 integral with the casing interme
After the desired amount of steering has been 75 diate the inlet and outlet‘passages 2M andiltr
, 222 formed'on a cylindrical-member 224 which
true for either power steering or manual steer
is keyed to the inwardly extending sleeve l3. This
sleeve 13 while somewhat longer in length than
the form shown in Fig. 3 is provided with radial
ing, since steering wheel motor 2lll provides but
1 one of two ways of rotating wheel ‘I ‘and its asso
ciated skirt I3, the other means being the con
ventional one of hand rotation as noted previ
passages and bores in a similar manner to the
corresponding element of the preferred form of
the invention shown in Figs. 3 to 6 inclusive. A
suitable bleed plug‘ 226 is provided extending
motor shown in Fig. 6 and its operation is‘simi
v When this latter or remote control unit is pro
through the remote-motor casing 2“) whereby
the auxiliary system can be bled and maintained
full of ?uid. The steering wheel shaft operating
motor illustrated in Fig. lllis identical to the
ing piping remain operative, the vehicle may be'
steered by remote control wheel 286. This holds
The annular chamber is also divided by the piston
vided and steering is done ‘in the conventional
manner by using wheel ‘I, the steering wheel
motor 2Ill is naturally rotated as wheel ‘I is
. rotated and thus motor 2") becomes the opera
- tor unit of the independent hydraulic system and
15 is‘ the means of operating piston 254, which in
‘ Movement is imparted to movable abutment
222 of the auxiliary motor 2H! by turning the
I turn'rotates wheel 208. In a ‘vehicle of the type
using this remote control the idle rotation of the
remote wheel under normal steering‘ conditions
would not present any difficulties. Movement of
to spokes 230 carried by a hub232, which is keyed 20 the secondary motor abutment 222 rotates the .
shaft I5 and its associated valve skirt I3 to ac
to rotary shaft 234. This shaft extends through
complish steering as heretofore described.
a casing formed of a pair of spaced annular plates.
I claim:
238 and 240 bolted on opposite sides of a cylin
auxiliary wheel 208 which is preferably located
at some distant point. The wheel 2M is a?ixed
1. A hydraulic steering gear comprising a steer
drical housing member 236. v The construction of
this ?uid operator or compressor is shown in‘Fig. 25 ing shaft, a rotary piston hydraulic motor se
cured around said shaft, a hand wheel, said hand
14. Fluid from tank 242 and controlled by valve
244 is led to the annular chambers 258 and 258 ' wheel carrying a valve sleeve concentrically
mounted around one end of said shaft, resilient
.of the 'device through auxiliary operating device
means connecting said hand wheel and shaft, pas
through inlet 246 and is discharged therefrom
through ports 248 and 258. These inlet and out 30 sages leading to and from a source of hydraulic
?uid formed in said valve sleeve longitudinal
let ports are connected by suitable piping to the
inlet and outlet ports 2| 4 and N6 of auxiliary ‘
bores in said shaft in communication with said
steering wheel motor 218. A‘sleeve 252 is keyed
motor, radial ports extending fronf'said bores for
on shaft 234 for rotation in the apertured cen- '
communication with the passages leading from
tral'ohamber 236 and provided with a radial pis
the source of hydraulic ?uid and normally out
of communication therewith whereby movement
of said hand wheel and valve sleeve controls the
?ow of hydraulic ?uid to and from said motor
to move said steering shaft; an equivalent dis
ton 254 ‘thereon whereby ?uid in either of the
side chambers 256 or 258 which are separated
by abutment 260 will be forced through the in
' let and outlet ports 248 and 258 when the shaft
234 is rotated. It will be obvious that when the 40 tance and in the same direction as said hand
auxiliary hand wheel 28!] is rotated the ?uid lying
‘ 2. A hydraulic steering gear comprising a_
between the piston 254 and either outlet 248 or
steering shaft, a hydraulic motor of the rotary v_ I
250 will be forced to flow to the auxiliary steer
ing wheel operating motor 218 where the said
piston type secured to said shaft for turning thev
motor 2 l0 and thus move valve sleeve It for ad- ,
. mission of the main ?uid pressure into the steer
, ?uid for “the motor, an inner valve sleeve en- ‘
?uid will give a corresponding rotation to radial 45 same, hydraulic ?uid inlet and exhaust passages
abutment 222 of the auxiliary steering wheel
and ports in said shaft for the ?ow of hydraulic
compassing the portion of ‘said shaft‘ provided
ing apparatus to complete its normal operation.
with said ?uid ports, a hand wheel connected to 1
Fluid from the opposite side of the steering wheel 50 said, valve sleeve for rotating the same, a rigidly _
secured outer sleeve overlying said inner valve
motor is also retumed by the return line to the
opposite side of the ?uid operator or compressor
sleeve, a second rotary piston motor, means con-v
necting the rotary portion of said second motor
and any seepage in the auxiliary wheel motor‘
to said inner valve sleeve, a remotely positioned
will collect in groove 262 formed in the shaft
234 and flew back to the tank 242 through port 55 independent ?uid transmitter, means to manu
ally actuate said-transmitter and a separate hy
264 and its associated piping. Thus, when remote hand wheel 208 is turned _ a draulic ?uid system connecting the said second
rotary piston motor to the said- independent
in either direction the radial piston 254 will force
?uid in the segmental annular chambers 256 or
3. A hydraulic. steering gear comprising a
258 through the discharge passages 248 or 250 60
and thence by the communicating piping to the ‘ tubular ?uid reservoir, bearings ?xed in the ends
of said reservoir for supporting a rotary steering
secondary motor casing through ports 2" or 2l6.
shaft extending therethrough, a hand wheel con
and moves the piston 222- clockwise or counter
nected through a lost motionv connection to one
clockwise as the case may be. Simultaneously .
?uid is forced from the opposite side of piston 65 end of said shaft and a steering arm on the op
posite end thereof, a ?uid motor having a‘ ro
222 to the opposite side'of piston 254. It is thus
tary piston encompassingsaid shaft secured to
evident that any ‘movement of wheel 288 will
said reservoir adjacent the said hand wheel, a
cause vpiston 254 to move and produce a like
valved sleeve overlying the said shaft and rotat
movement of piston 222, which in turn, by means,
of its keyed association with sleeve l3, produces 70 able with the said hand wheel, cooperating ?uid
passages formed in said shaft and sleeve whereby
alike and- similar movement of wheel ‘I to ac
. complish power steering as previously noted. It
7 is also apparent that so long as the independent
hydraulic system consisting of the operator unit.
?uid under pressure is introduced into said mo- '
_ tor for positively rotating said motor piston when .
‘i said hand wheelie rotated.
wheelmotor unit 2" and thcir‘conncct 76
4.4 hydraulic steering aura-de?ned m
claim 3 wherein initial movement of said hand
wheel aligns the ?uid passages in said valved
sleeve and shaft whereby hydraulic ?uid is in
ble by said wheel and having a close Working fit
on ‘said shaft, a resilient coupling between said
wheel and said shaft, means to deliver high pres
troduced into said motor on one side of said r01
sure ?uid to and withdraw low pressure ?uid
from said sleeve, a radial passage in said sleeve
connected ‘to the. high pressure ?uid means, two
tary piston and exhausted from the opposite side
thereof and said piston is rotated a. degree cor
responding to the initial movement of said hand
5. A hydraulic steering gear comprising a ro
tatabiy mounted steering shaft, a rotary hy
. longitudinal bores in said shaft leading to said
motor, spaced radial ports connecting said bores
to the shaft surface and spanning but normally
10 out of cooperation with said passage, a second
draulic motor having a movable element secured
pair of spaced ports for said bores, said sleeve
to said shaft, a hand wheel, a valve sleeve mova
having two radial passages connected to the ?uid
ble by said wheel and having a closeworking fit
withdrawal means and each normally having a
on said shaft, a resilient coupling between said
slight overlap with one of said lastmentioned
wheel and said shaft, means to deliver high pres
sure ?uid to and withdraw low pressure ?uid
8. The hydraulic steering gear combination as
from said sleeve, radial passages in said sleeve
defined in claim 7 wherein the movement of the
separately connected to said means, two longi
wheel in either direction causes overlap of said
tudinal bores in said shaft leading to the said’
?rst mentioned radial passage with one of the
motor element, and two radial ports connected 20 ?rst mentioned radial ports, and the separation
to each bore, said sleeve passages each being po
of the corresponding one of the second-men
sitioned for selective cooperation with said ports.
tioned radial passages from its cooperating port.
6. A hydraulic steering gear comprising a ro
9. The hydraulic steering gear as de?ned in
tatably mounted steering shaft, a rotary, hy
claim 5, wherein a second hydraulic motor is pro
draulic motorhaving a movable element secured 25 vided having a ?xed housing and a rotor, said
to said shaft, a hand wheel, a valve sleeve mova
rotor surrounding and ?xed to said valve sleeve,
ble by said wheel and having a close working ?t
a remote hand wheel, a hydraulic transmitter
on said shaft, a resilient coupling between said
operable by said remote hand wheel and hy
wheel and said shaft, means to deliver high pres- .
draulic closed circuit connections between said I
sure ?uid to and withdraw low pressure ?uid 30 second motor and said transmitter.
~ ‘
from said sleeve, a radial passage in said sleeve
10. The hydraulic steering gear as de?ned in
connected to the high pressure ?uid means, two
claim 7 wherein a second or remote hand wheel
longitudinal bores in said shaft leading to said
is provided. a pair of similar pump-motors, a
motor, spaced radial ports connecting said bores
to the shaft surface and spanning but normally
out of cooperation with said passage and means
, to exhaust ?uid fromthe motor.
pair of pipes connecting said pump motors for
conducting hydraulic ?uid between them where
by either may act as a pump to actuate the other '
as a motor, each pump-motor having a rotor.
. one of. said rotors being secured to saidrsecond
7. A hydraulic steeringvgear comprising a ro
tatably mounted steering shaft, 9. . rotary hy
hand wheel and the other being secured to said
draulic motor having a movable element secured 40 valve sleeve.
to said shaft, 8, hand wheel, a valve sleeve mova
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