Патент USA US2411119код для вставки
7 Nov. 12, 1946. w. T. STEPHENS 2,411,119 ' ~ STEERING MECHANISM Filed May 18, 1945‘ 4 sbeQts-“shégt 1 ‘RESERVOIR BCCUMULHT OR -.___ Nov. 12, 1946. ' 2,411,119 w. T. STEPHENS ‘ ' STEERING MECHANISM Filed May 18, 194,37 _ 4 Sheets-Sheet 2 HAN WILLIAM T. s'mpmzlis 3%” (,5! , EM. Nov. 12, 1946. w. T. ‘STEPHENS 2,411,119 STEERING MECHANISM Filed may 18, 1943 _ 1 ‘ 4 Sheets~5heet 4 715625.72. _ 1 . \ 242 I - . - ‘l '7 A’? \ II / . 244'. l 3 19 v , . 5 /' :00 |, ' I/ ' 1 ‘ '21 \\ I‘? v 4 ' 256 1A 7 1 221a _ 777252’. 7% 13> 2 ~ 1246 so ' 14 ' 1 5Q gvwwvbola 1 . 126° WILLI?M 'ISTEPHENS 7.3 . _ 3% l a‘ £21“I‘ 1 ,1 .W; Patented Nov. 12, 1946 ’ 2,411.119' r’. umrso srn'ras PATENT OFFICE STEEEBXG MECHANISM 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) i 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 type. ofFlg.3; 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 novel hydraulic 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; . 2,411,119 - 3 '4 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 means. i - 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. 2,411,119 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 movement. , . 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 2,411,119 , 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 ously. suitable bleed plug‘ 226 is provided extending motor shown in Fig. 6 and its operation is‘simi lar. , , » . ' _, 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 ,8 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 wheel. 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. transmitter. » » ?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 2,411,119 ~ 9 10 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 wheel. 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 ports. ' , 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 WILLIAM T. STEPHENS.