Патент USA US2409188код для вставки
' Oct. 15, 1946.‘ v, v, BLASUTTA I 2,409,185 HYDRAULI C APPARATUS Filed June 19, 1943 4 Sheets-Sheet 1 '74 37 22 21 36 \ 69 ‘ ' INVENTOR 4; WcmRVBLAsUTTA BY 769mm ' ATTORNEY 0d. 15, 1946. v_ vT BLASUTTA 2,409,185 HYDRAULIC )APPARATUS Filed June 19, 1945 @ - 4 Sheets-Sheet? 99 - INVENTOR VMJTQR V. BLASUT'EA ATTORNEY 0145,1946, v. v. BLASUTTA - ~ 2,409,185 HYDRAULIC APPARATUS Filed June 19, 1943 F1G.3. ’ | / 120 , 4 Sheets-Sheet 3 61 59., 60/‘. 6ZA66 57 646265 5 47 554%. . I 475 67 j 9 —~— J A ’36 31 ~38 w a?» l . g) 64 e3 e2 60 a7 91 90 Lag/Q 61/’ \ L62A FIG.4. /. 95' 4 / Y 7/ "-> 9i VICTORVBLAsUTTA 06L 15, 1946~ v. v. BLASUTTA ' 2,409,135 HYDRAULIC APPARATUS Filed June ‘19, 1943 4 Sheets-Sheet 4 INVENTOR ‘ VICTOR V BLASUTTA BY WM 7/3’ 41?“ TTORNEY 5/ Patented Oct. 15, 1946 2,409,185 UNITED STATES PATENT OFFICE 2,409,185 HYDRAULIC APPARATUS Victor V. Blasutta, Columbus, Ohio, assignor to The Deniscn Engineering Company, Columbus, Ghio, a corporation of. Ohio Application June 19, 1943, Serial No. 491,474 11 Claims. 1 This invention relates generally to hydraulic equipment and is particularly directed to ?uid pressure energy translating devices of the type having rotatable cylinder barrels with movable (Cl. 121-62) 2 - panying drawings wherein a preferred form of embodiment of the invention is clearly shown. In the drawings: Fig. 1 is a vertical longitudinal sectional view pistons and thrust means for imparting move taken through a hydraulic motor formed in ac-, ment to the pistons or cylinder barrels in the op» cordance with the present invention showing the eration of the devices. thrust means thereof in condition to prevent op An object of this invention resides in the pro eration of the motor; vision of a ?uid operated motor which will pro Fig. 2 is a similar view showing the thrust duce a substantially constant power but due to 10 means in condition to cause the motor to oper certain adjustable elements therein will be capa ate when ?uid under pressure is supplied there ble of developing a variable torque in response to changes in ?uid pressure caused by the applica tion to or removal of loads from the motor. Another object of this invention rests in pro to; . Fig. 3 is a horizontal sectional view taken on the plane indicated by the line 3-—3 of Fig. 1 15 showing the thrust means in condition to cause viding a ?uid motor of the type mentioned with operation of the motor; ‘ ?uid pressure operated mechanism which is con Fig. 4 is a detail sectional view taken through nected with the thrust means and is subjected to the means for automatically adjusting the thrust the pressure of the ?uid in the supply line to the member of the motor on the plane indicated by motor whereby an increase in pressure on the 20 the line 4-4 of Fig. 1; ?uid in the supply line, due to the imposition of a Fig. 5 is a vertical transverse sectional view load on the motor, will be transmitted to the pres taken on the plane indicated by the line 51-5 of sure operated mechanism and will cause it to Fig. 1; and change the position of the thrust means so that Fig. 6 is a similar view on the plane indicated the torque of the motor will be increased and by the line *6—6 of Fig. 1. 1 maintained until the load is relieved. Referring more particularly to- the drawings, A further object of the invention resides in the the numeral 20 designates the motor in its entire provision of a ?uid motor having a rotatable ty. In the embodiment of the invention illus cylinder barrel with a plurality of pistons and trated, the motor 20 includes a casing 2i which thrust means disposed at an angle to the longi may be formed from cast metal and is generally tudinal axes of the pistons so that when the lat circular when viewed from the front. This cas ter are forced by ?uid pressure toward the thrust ing has angularly related front and rear walls member the reaction produced by the angularity 22 and 23, the former of which is provided with of the thrust member will cause the cylinder bar an enlarged circular opening 24. This opening is rel to revolve, the motor having means for sup normally closed by a removable cover 25 which porting the thrust member for pivotal movement is suitably secured to the casing to permit ready and means actuated by ?uid pressure to move the removal, when necessary, to service the motor. thrust member whereby the angular relation thereof to the pistons will be changed to increase In axial registration with the opening 25, the rear wall of the casing is provided with an opening 25 which is smaller in diameter than the former opening and is closed by a port plate 27 secured to the rear wall of the casing by headed screws 23. Both the port plate 21 and the cover 25 are pro vided with ball bearings 29 and 30, respectively, or decrease the reaction according to variations in loads placed upon the motor. Another object is to provide the ?uid motor mentioned above with piston means for changing the angularity of the thrust member, means also being provided to balance the ?uid pressure on to rotatably receive the drive shaft 3! of the mo opposite sides of the piston, under normal condi tor. rThe bearing 29 is received in a central re tions of operation, but when abnormal conditions cess 32 formed in the port plate 21 and this bear obtain a differential in pressure on opposite sides ing is relatively small when compared to the of the piston will be created which will cause the bearing 30 in the cover 25. To hold the latter piston to move and change the angularity of the 50 bearing, the cover 25 is provided with a central thrust means thereby increasing the torque of the ' boss 33 in which an opening 34 is formed, the motor. bearing being inserted in the opening and held Further objects and advantages of the present against removal by a snap ring 35. The shaft invention will be apparent from the following is prevented from being withdrawn through the description, reference being had to the accom bearing 30 through the provision of a shoulder 2,409,185 3 assists in maintaining the relative positions of the shaft and the bearing. The opening 34 is closed at the outer end- by a packing gland 39 which is provided with sealing rings 40 for engagement 4 receive pivot pins 62 which project toward the 36 on the shaft which shoulder engages the inner race of the bearing 33 at the outer side of the bearing 30. The shaft 3| is provided with a groove 31 to receive a second snap ring 38 which interior of the casing. The pivot pins are pro vided with tapped holes at their outer ends to receive screws 62A Which extend into the boss 63 from the outer side of the plates 6| and serve to retain the pins in‘connection with the plates ‘6| to provide for the pivotal support of a cradle ‘63. The latter member consists of a ring-like body provided at opposite sides with apertured without the escape of ?uid therearound when the’ 10 ears 64 for the reception of the pins 62. When with the shaft 3| to permit rotation of the shaft thecradle is disposed in the casing with the pins 52 properly positioned in the openings in the casing is ?lled with hydraulic ?uid. The bearing 3|] will be constantly lubricated by the ?uid in the casing and the bearing 29 at the inner end of the shaft will be lubricated by the ?ow of ?uid through angularly related passages 4| which extend from the inner face of the port plate to the inner end of the-recess 32.‘ This ears 64, the cradle will be free to rock about axes of the aligned pins. In the present stance, the casing and the plates 6| with boss Bil are so formed and positioned that the in the the 7 axis formed by the pins 62 will extend at right angles to the shaft 3| and precisely through the longitudinal axis thereof. The cradle is pro ment of a cylinder barrel 42 with a circular raised 20 vided with anenlarged ball bearing 65, the outer race 66 of which is carried directly by the cradle pad on the inner face of the port plate. 63 and the inner race 61 is supported for rota The cylinder barrel consists of a cvlindrical tion' by a. plurality of balls 68, the inner race in block 43 having a central opening 44 extending turn supporting the thrust ring 58. Through the therethroug'h for the reception of a shaft 3|. At its outer end, the cylinder barrel has a splined 25 provision of the ‘pivoted cradle, the thrust ring may be adjusted relative to the axis of rotation connection with the shaft 3| in order that when of the cylinder barrel from a position substan the cylinder barrel revolves, similar movement tially at right angles thereto, as shown in Fig. 1, will be imparted to the shaft, the splines serving to inclined positions, as illustrated in Fig. 2. The to key these two elements to one another. ‘degree of adjustment of the cradle will depend Around the central opening 44, barrel 42 is 30 upon the clearance provided between the cradle provided with a circularly arranged row of cyl and the adjacent parts of the motor. When the inders 45 provided for the reception of elongated cradle is so positioned that the thrust ring is in pistons 46, the latter being closely ?ttedv to the clined relative to the cylinder barrel and fluid is cylinders to reduce the escape of ?uid between introduced into the cylinders communicating with 35 the walls thereof to a minimum but still permit the inlet port, the pistons in these cylinders will sliding movement of the pistons in the cylinders. be urged toward the thrust ring and due to the At its rear end, the barrel 43 has arcuate open inclination thereof, a reaction will be set up which ings 41 which establish communication between will cause the cylinder barrel to rotate in a di the cylinders 45 and inlet and outlet ports 48-and 49,-respectively, formed in the port plate 21. The 40 rection which will permit the pistons to move outwardly of the cylinders as far as possible. latter ports are also arcuate in shape and extend In so moving the cylinders will consequently slightly less than one-half the distance around reach the sealing surface 5| which will prevent the port plate, the ends of the inlet and outlet communication between the inlet port and the ports beingr spaced to provide sealing surfaces 50 respective cylinder, and after each cylinder has 45 and 5|. These sealing surfaces have a plurality _ passed the surface 5|, the cylinder will commu of shallow recesses 51A formed therein to entrap nicate with the outlet port 49 whereby the ?uid foreign material contained in the hydraulic ?uid will be permitted to escape and relieve the pres and prevent the same from injuring the sealing sure in the cylinder. As one cylinder moves be surfaces or other parts of the motor due to abrad yond the end of the inlet port 48, another cyl method of providing for lubrication of the hear ing 29 is essential because of the sealing engage ing action. The inlet and outlet ports 48 and 419 are con nected at their inner ends with chambers 52 and 53 formed in the port plate 2'! with which con 50 inder will be moved into communication there with and the cycle of operation will be repeated. During the time the cylinders are in communica tion with the port 49 while the cylinder barrel duits 54 and 55 communicate. These conduits is revolving, the ?uid previously introduced to 55 are threaded into a connector plate 56 which is the cylinders will be expelled because the pistons attached to the outer end of the port plate and are moved inwardly of the cylinders by the thrust sealing rings 51 are disposed around the cham ring. When the piston in any particular cylin bers 52 and 53 at the points where the openings der has been forced into the cylinder as far as in the connector plate meet the chambers. These possible by the thrust ring, the respective cyl sealing rings prevent the escape of ?uid at the 60 inderwill have reached the sealing surface 50 joint between the connector and port‘ plates. whichyseparates the rear end of the outlet port When ?uid under pressure from any suitable from the forward end of the inlet port and ?uid source is introduced into the chamber 52 through flow from the cylinder will be discontinued. the pipe 54, the ?uid will ?ow through the inlet the surface 50 is passed ?uid under pres port 48 and into the particular cylinders 45 which 65 After sure will again ?ow into the cylinder as before are connected to the inlet port by the openings described. Continued rotation of the cylinder 41. This ?uid will force the pistons 46 outwardly barrel causes repeated operations of the pistons of the cylinders causing the outer ends of the and the cylinder barrel will be caused to rotate pistons to exert pressure on a thrust ring 58 as long as ?uid under pressure is supplied to the 70 which is supported around the shaft 3| at the inlet port and the thrust ring is maintained in an outer end of the cylinder barrel. inclined position. To support the ring 58, the casing 2| is pro ' t is proposed to utilize this motor for effect vided at its sides with registering openings 59 ing the operation of any suitable machine such for the reception of bosses 60 provided on plates 6|. These bosses are formed with openings to 75 as‘ a lathe, and in some instances, loads applied 5 2,409,186 to the machine will increase the resistance to turning movement of the motor shaft. When these conditions obtain, it has been found de sirable to increase the inclination of the thrust 6 piston 13, tothe opposite end of the chamber 12. This end of the chamber is connected by a series of passages 95, 96 and 9‘! with the interior of the casing 2|. Under normal conditions, ?uid ?ow through this series of passages is precluded by a or if the load on the motor is decreased, the relief valve 98 disposed in a chamber 99 formed torque should be correspondingly decreased. in the body ‘I0 between the passages 95 and 96. The thrust ring has been supported within the Since ?uid is contained by the chamber ‘I2 on casing in the manner previously described to both sides of the piston 73 and the valve 98_ is permit these adjustments. To effect them auto 10 closed, pressure on opposite sides of the piston matically, however, additional mechanism has will be equalized and piston 13 will remain sta been provided as indicated generally at 69 in tionary. The valve 98 includes a seat I00 and a Figs. 1 and 2. This mechanism includes a body conical valve I 0|, the latter being carried by a ‘I0 which is secured to an inclined pad ‘(I on the head I02 disposed for sliding movement in the rear wall of the casing 2|. The body is provided 15 chamber 99. Valve seat I00 is arranged in the with an internal chamber 12 for the slidable chamber 99 between the points where passages reception of a piston ‘I3. This piston has a stem 95 and 96 communicate therewith and the valve i4 projecting therefrom through an opening in IOI is held in engagement with the seat I00 to the body into the interior of the casing 2I. At normally prevent communication between the its inner end, this stem engages a roller ‘I5 car 20 passages 95 and 96, by a coil spring I03 which ring and thereby increase the torque of the motor ried between bifurcated ears 15 on the cradle 63, the roller ‘I5 being rotatably mounted on a pin 'I'I supported by the ears ‘I6, to eliminate friction between the stem ‘M and the cradle during rela tive movement of these elements. The ears ‘I6 25 are disposed on the cradle at approximately 90° from the axis formed by the pins 62 and a sec engages the head I02 at one end and an adapter I04 at the other end. The degree of force ex: erted by the spring on the head and valve may be varied through the adjustment of screw I05 carried by a plug I09 which closes the outer end of the chamber 99. The inner end of the screw I05 has a conical point for engagement in a sim ilarly shaped recess in the adapter. When the screw I95 is adjusted inwardly, the force exerted ond set of ears ‘I8 are arranged on the cradle di ametrically opposite the ears ‘I5. Ears 79 are spaced to receive a second roller ‘I9 which is en 30 by the spring on the valve will be increased and, gaged by the inner end of a plunger 80 disposed for sliding movement in an opening formed in a body 8|. This body is secured to the upper conversely, if the screw is adjusted outwardly, the spring will exert less force on the valve. The screw is maintained in its positions of adjust— portion of the rear wall of the casing 2I and is ment by a jam nut I01. To prevent the escape provided with a chamber 82 in open communi 35 of ?uid around the screw, a ?exible seal ‘I08 is cation with the opening in which the plunger positioned between the inner end of the plug I06 80 slides. The outer end of the chamber 82 and the movable head I02. When the pressure is closed by a plug 93 which also serves as an on the ?uid in the chamber 12 increases suffi abutment for one end of spring 84, the opposite ciently to overcome the force exerted by the end of this member engaging the outer end of 40 spring I03, the ?uid will ?ow past the valve HH the plunger 89. Due to the resiliency of the and through ports 99 and 91 to the interior of spring 84, the plunger 80 will be urged into the casing 2|. This ?ow will permit ?uid to yieldable engagement with the roller ‘I9 and will escape from the inner end of the chamber ‘I2 and tend to maintain the cradle 93 in a position at if the rate of flow is greater than the rate at right angles to the axis of rotation of the shaft 45 which ?uid can ?ow through the ori?ce 94 the 3 I. To assist the spring 94 in moving the plunger piston will be moved inwardly or toward the cas 89 and the cradle 93, the body BI is provided with ing by the ?uid pressure on the outer side of the an opening 85 through which ?uid under pres piston. This movement will be transmitted to sure is supplied to the chamber 82. This ?uid the cradle by the stem ‘I4 and the cradle will be enters the chamber through an elbow 86 threaded 50 rocked about the pins 62 to an inclined position. into the opening 85 and connected to one end as shown in Fig. 2, and the torque of the motor of a tube M which receives hydraulic ?uid under will be increased. The movement of the cradle pressure from the inlet of the motor. will be discontinued when the piston 13 reaches To move the cradle against the force of the the limit of its travel or the ?uid pressures on spring 84 and the ?uid supplied to the chamber 55 opposite sides of the piston became balanced due 82, means are provided to supply ?uid under to the restriction of fluid flow through the pas pressure to one end of the chamber ‘I2. This sages 95, 9E and 91 by the valve IOI. When the means comprises an elbow 89 which is threaded latter condition occurs, the force exerted by into the body ‘It and communicates with a drilled spring 34 and the ?uid in chamber 82 will tend opening 89 extending from the opening for the to move the cradle towards its inactive position, elbow to the outer end of the chamber ‘I2. A shown in Fig. 1, and this movement will cause section of tubing 99 is connected at one end to the piston ‘I3 to move toward the outer end of the elbow 88 and at the other end to a ?tting 9I chamber 12. The rate of movement of the pis threaded into the port plate as at 92. A short ton in this direction will be controlled by the passage 93 leads from the inner end of the ?tting 65 speed at which ?uid can flow through the ori?ce 9! to the chamber 52 which is connected with 94. .‘ the inlet port 48 and the source of ?uid under In some instances, it may be desirable to limit pressure. Thus, when ?uid is initially supplied the degree of movement, of the cradle toward to the pump, some thereof will ?ow through the the position wherein the thrust ring will, be at passage 93 and tubing 99 to the elbow 88 and 70 right angles to the axis of the shaft 3|. To through the opening 99 to the chamber ‘I2. This accomplish this object, a stem I99 is provided ?uid will exert pressure on the outer side of the on the outer side of the piston 2'3. This stem piston 13 and tend to move the same toward the extends into an opening formed in the cap II 0 motor casing. Some of the ?uid will ?ow for the body ‘It and engages the inner end of a through a restricted ori?ce 94 provided in the threaded stop screw I I I, the head of which is also 8 disposed in theopening. The longitudinal posi tion of the stop screw in the opening may be changed by adjusting a hand wheel H2 which is rotatably supported at the outer end of the body 10. This hand wheel is keyed at H3 to a‘ sleeve H4 which is interiorly threaded for the recep tion‘of stop screw IH. One end of the sleeve is the ?uid supplied to chamber_8_2_ will moveinthve plunger 80 into the casing’ and transmit force to the cradle causing it to move in the opposite direction. This movement will be transmitted to the stem Y14 and piston 13. whereby the latter will move toward the outer end of the chamber 72. As the thrust ring approaches a position at right angles to the shaft 31, the resistance to provided with a ?ange H5 to form a shoulder the flow of ‘fluid through the motor will again H6 with which a complemental-shoulder pro vided in a retaining nut H1 is engaged.‘ The 10 increase ‘and the cycle of operation will be re peated. The apparatus will ?nally reach a bal nut H1 is interiorly threaded so that it may anced condition wherein the thrust ring is main be applied to the threaded reduced outer end tained at the properly inclined position to cause of the cap Hi]. When the nut H1 is so posi the motor to develop the required power‘ but tioned, the end of the sleeve H4 will be held in abutting relation with the end of the cap through 15 in the event an undue load is placed 'on the motor, the pressure of the incoming ?uid will the engagement of the shoulders on the sleeve and in the nut. As illustrated in Figs. 1 and 2, the opening for the stem I09 has a keyway for the reception of a key H8 carried by the head of the screw H i. This key prevents the screw 20 from rotating and when the hand wheel H2 is revolved, the reaction between the threads in the sleeve H4 and on the screw III will cause the latter to move into or out of the opening of the cap H0. The degree of movement may be determined by comparing the relative position of the annular marks on the outer end of the screw with the outer end of the sleeve. When it is again be increased-causing the automatic con trol mechanism to operate to again increase the angularity of the thrust ring. Thus the torque of'the motor will be increased as occasion de mands. When the relief valve 98 operates to permit ?uid to flow from the passage 95 to pas: sage 96,’this ?uid will ?ow through passage 91 into the motor casing. It will escape from this casing through a conduit I20 at the top of the motor to the outlet chamber 53 with which the conduit I 20 is connected. While the form of embodiment of the present desired to make this adjustment, the nut H1 is invention as herein disclosed constitutes a pre turned suf?ciently to free the ?ange I I5 and per mit the hand wheel and sleeve to rotate. After the screw has been placed in the desired posi tion, the nut H‘! is tightened to clamp the ?ange H5 and maintain the adjustment. Packing H9 scope of the claims which follow. is provided around the stem I09 to prevent the escape of ?uidfrom the chamber 12. , The operation of the device is as follows: As suming that the system in which the motor is connected is charged with hydraulic ?uid; upon ferred form, it is to be understood that other forms might be adopted, all coming within the I claim: _ _ ' 1. A ?uid motor actuated by ?uid pressure comprising a casing having inlet and outlet ports: shaft means journalled‘ in said casing; a barrel having a plurality of cylinders for imparting ro tation to said shaft means, said cylinders com municating alternately with said inlet and outlet the introduction of ?uid under pressure to the 4:0 ports upon rotation of said cylinder barrel; piston means disposed for movement in said cylinders; motor through the line 54, the ?uid will flow thrust means mounted in said casing in engage through the inlet port 48 into the cylinders com ment'with said pistonmean's, said thrust means municating therewith. The pressure of the ?uid being disposed at an anglewith respect to axis on the pistons will force the same outwardly of said shaft; and means. for varying the angle against the thrust ring. If the thrust ring is of said, thrust means including a body having a at right angles to the axis of the shaft iii,v the chamber, a piston disposed for movement in said cylinder barrel will not revolve and the motor chamber, means for transmitting movement from shaft will stand idle. The pressure will there said piston to said thrust means, ?uid conduct fore increase in the line 54 and chamber 52 as well as in tubing 90 and the outer end of chamber 59 ing means establishing communication between said inlet port and one end of said chamber and '12. The pressure on the ?uid will also be exerted the opposite end of the chamber and said outlet by'the piston 13 on the fluid in the inner end of port, said piston having a restricted ori?ce estab chamber v‘i2, and will be transmitted through the lishing communication between opposite ends of passage 95 to the inlet side of relief valve 98'. When this pressure is of sufficient intensity to 55 said chamber, and a pressure operated valve lo__ cated between said chamber and said outlet port, overcome the force of spring I03, the valve will said. valve being operative under predetermined open to permit ?uid to escape from the inner ?uid pressure to establish ?uid ?ow from said end of the chamber and a differential in pres chamber. sure will exist on opposite sides of piston 13, 2. A ?uid motor actuated by ?uid pressure the higher pressure being on the outer side there 60 comprising a casing having inlet and outlet ports; of. Due to this difference in pressure, the piston shaft means journalled in said casing; a barrel will move toward the motor casing 2| causing having a plurality of cylinders for imparting ro the stem 14 to impart movement to the cradle tation to said shaft means; said cylinders com and the thrust ring will then be inclined with respect to the cylinder barrel] When this con 65 municating alternately with said inlet and out let ports upon rotation of said cylinder barrel; dition obtains the force of the pistons against piston means disposed for movement in said cyl the thrust ring reacts to cause the cylinder barrel inders, a cradle mounted in said casing for piv to revolve. After the cylinder barrel gains some otal movement about an axis extending‘ at right momentum and the resistance to rotation has decreased, the pressure on the ?uid in the cham 70 angles to and through the axis of rotation of said shaft means, thrust means carried by said cradle ber 72 will be relieved and valve 98 will close in engagement with said pistons’; and means for to. such an extent that the ?ow of ?uid through moving said cradle about .the axis therefor, said the restricted ori?ce 94 will be sufficient to bal cradle moving means having a body with a cham ance the pressure on opposite sides of the piston ‘13. At this time, the force of the spring 84 and 75 berra piston mounted for movement in said 2,409,185 "9 chamber, means for transmitting movement from said piston to said cradle, ?uid conducting means establishing communication between the inlet to 10 means in said casing’ supporting said thrust means for movement to vary the angular rela tion thereof to said pistons, and means for auto matically controlling the angularity of said thrust said casing and one end of the chamber in said body, means for conducting ?uid from the op posite end of the chamber, said piston having an ori?ce to establish restricted communication be— means in response to pressure variations in said whereby pressure differentials will exist on op~ posite sides of said piston and the latter will move in response to the higher pressure. 3. A motor actuated by ?uid pressure co'm ?ow from the other of said chambers whereby inlet port, said control means having a body with a cylinder therein; control piston means dividing tween opposite ends of the chamber in said body said cylinder into a pair of chambers, said con and a spring-pressed valve in said latter ?uid trol piston being provided with a reduced ori?ce conducting means, said spring pressed valve be 10 to establish limited communication between said ing responsive to pressures in the chamber in said chambers; means for supplying fluid at the pres body to provide for fluid ?ow from said chamber sure in said inlet port to one of said chambers; prising a casing having inlet and outlet ports; a cylinder barrel supported for rotation in said casing with the cylinders thereof alternately com and pressure responsive means to control ?uid pressure differentials will occur on opposite sides of said control piston to cause movement thereof. 6. A motor actuated by fluid pressure compris~ ing a casing having inlet and outlet ports; a cylinder barrel supported ‘for rotation in said municating with said inlet and outlet ports; pis 20 casing with the cylinders thereof alternately com ton means disposed for movement in said cylin municating with said inlet and outlet ports, piston ders; thrust means engaging said pistons; means means disposed for movement in said cylinders; in said casing supporting said thrust means for thrust means engaging said pistons; means in movement to vary the angular relation thereof said casing supporting said thrust means for to said pistons; and means for automatically con 25 movement to vary the angular relation thereof trolling the angularity of said thrust means in to said pistons, and means for automatically con response to pressure variations in said inlet port, trolling the angularity of said thrust means in said control means having a body with a cylinder response to pressure variations in said inlet port, therein; control piston means dividing said cyl said control means having a body with a cylinder inder into a pair of chambers having limited com~ 30 therein; control piston means dividing said munication with one another; means transmit cylinder into a pair of chambers, said control ting movement from said piston means to said piston being provided with a reduced ori?ce to thrust means; means connecting one of said establish limited communication between said chambers with the port having the variable pres chambers; means for supplying ?uid at the pres sures; passage means connecting the other cham sure in said inlet port to one of said chambers; ber with a low pressure line; and means re pressure responsive means to control ?uid ?ow sponsive to the pressures in said inlet port to from the other of said chambers whereby pres control ?uid ?ow through said last mentioned sure differentials will occur on opposite sides of passage means. said control piston to cause movement thereof; 4. A motor actuated by ?uid pressure com 40 and means for varying the sensitivity of said pres sure responsive means. prising a casing having inlet and outlet ports; a cylinder barrel supported for rotation in said 7. A motor actuated by ?uid pressure com casing with the cylinders thereof alternately prising a casing having inlet and outlet ports; a communicating with said inlet and outlet ports, cylinder barrel supported for rotation in said piston means disposed for movement in said cyl 45 casing with the cylinders thereof alternately com inders; thrust means engaging said pistons; municating with said inlet and outlet ports, pis means in said casing supporting said thrust ton means disposed for movement in said cylin means for movement to vary the angular rela ders; thrust means engaging said pistons; means tion thereof to said pistons, and means for auto» in said casing supporting said thrust means for matically controlling the angularity of said thrust movement to vary the angular relation thereof to means in response to pressure variations in said said pistons, and means for ‘automatically con inlet port, said control means having a body with trolling the angularity of said thrust means in a cylinder therein; control piston means dividing response to pressure variations in said inlet port, said cylinder into a pair of chambers having said control means having a body with a cylinder limited communication with one another; means 55 therein; control piston means dividing said cyl transmitting movement from said piston means inder into a pair of chambers, said control piston to said thrust means; a ?uid passage connecting being provided with a reduced ori?ce to establish one of said chambers with the port having the limited communication between said chambers; variable pressures whereby increasing pressure means for supplying ?uid at the pressure in said will cause said piston to move said thrust means 60 inlet port to one of said chambers; pressure to vary the angularity thereof relative to the responsive means to control ?uid flow from the pistons in said cylinder barrel; a second ?uid other of said chambers whereby pressure differ passage connecting the other of said chambers entials will occur on opposite sides of said con with a low pressure line; and valve means for trol piston to cause movement thereof; and means controlling ?uid flow through the second ?uid 65 for limiting the range of operation of said con trol piston. passage, said valve being responsive to variations in pressure in the chamber connected with said 8. A motor actuated by ?uid pressure compris passage. ing a casing having inlet and outlet ports; a 5. A motor actuated by ?uid pressure com cylinder barrel supported for rotation in said prising a casing having inlet and outlet ports; 70 casing with the cylinders thereof alternately communicating with said inlet and outlet ports, casing with the cylinders thereof alternately piston means disposed for movement in said communicating with said inlet and outlet ports, cylinders; thrust means engaging said pistons; piston means disposed for movement in said cyl means in said casing supporting said thrust means inders; thrust means engaging said pistons; 75 for movement to vary the angular relation thereof a cylinder barrel supported for rotation in said £405,185 11 v to said pistons, and means for automatically con trolling the angularity of said thrust means in 12 to said pistons; and means for automatically cone trolling the angularity of said thrust means in response to pressure variations in said inlet port, response to pressure variations in said inlet port, said control means having a passage extending said control means having a body with a cylinder from the inlet port to an outlet; a cylinder in therein; control piston means dividing said cyl said passage; control piston means dividing said inder into a pair of chambers, said control pis cylinder into chambers, a passage of predeter ton being provided with a reduced ori?ce to estab mined size establishing limited communication lish limited communication between said cham between said chambers; said control piston being bers; means for supplying fluid at the pressure movable in response to pressure differentials in in said inlet port to one of said chambers; pres said chambers; means for transmitting movement sure responsive means to control ?uid ?ow from of said piston to said thrust means; valve means the other of said chambers whereby pressure in said passage between said cylinder and said differentials will occur on opposite sides of said outlet, said valve being responsive to pressures control piston to cause movement thereof; and means for varying the minimum torque developed 15 above apredetermined degree to increase ?uid flow from said cylinder; and means for varying by said motor at a particular ?uid pressure. the degree of pressure at which said valve becomes 9. A motor actuated by ?uid pressure com operative. -_ prising a casing having inlet and outlet ports; 11. A motor actuated by ?uid pressure com a cylinder barrel supported for rotation in said casing with the cylinders thereof alternately com 20 prising a casing having inlet and outlet ports; a cylinder barrel supported for rotation in said municating with said inlet and outlet ports, pis casing with the cylinders thereof alternately com ton means disposed for movement in said cyl municating with said inlet and outlet ports, pis~ inders; thrust means engaging said pistons; ton means disposed for movement in said cylin means in said casing supporting said thrust means ders; thrust means engaging said pistons; means for movement to vary the angular relation there in said casing supporting said thrust means for of to said pistons; and means for automatically movement to vary the angular relation thereof controlling the angularity of said thrust means to said pistons; resilient means tending to urge in response to pressure variations in said inlet said thrust means toward an inactive position; port, said control means having a passage ex tending from said inlet port to an outlet; 9. cyl 30 means for urging said thrust means toward active position in opposition to said resilient means, inder in said passage; control piston means divid said second urging means having a cylinder; a ing said cylinder into chambers, a passage estab piston disposed for movement in said cylinder lishing limited communication between said chambers; said control piston being ‘movable in response to pressure di?erentials in said cham bers; means for transmitting movement of said piston to said thrust means; and pressure respon sive means in said passage between said cylinder and said outlet to control ?uid flow from said cylinder, an increase in pressure in said cylinder in response to pressure differentials obtaining in opposite ends of said cylinder, said piston being returned to normal position by said resilient means when pressures are equalized in opposite ends of said cylinder; means for transmitting motion from said piston to said thrust means; and means for creating pressure differentials in opposite ends of said cylinder having a ?uid pas sage connecting one end of said cylinder and the inlet port of said motor; a second ?uid passage extending from the opposite end of said cylinder 10. A motor actuated by fluid pressure com- _ to the outlet port, the ends of said cylinder being prising a casing having inlet and outlet ports; a in limited communication; and pressure respon cylinder barrel supported for rotation in said sive valve means in said second ?uid passage, said casing with the cylinders thereof alternately com valve means regulating ?uid?ow through said municating with said inlet and outlet ports, second passage in proportion to the pressures piston means disposed for movement in said cyl inders; thrust means engaging said pistons; 50 existing in the end of said cylinder connected with said second passage, means in said casing supporting said thrust means VICTOR V. BLASUTTA. for movement to vary the angular relation thereof beyond a predetermined degree serving to in crease the ?ow of ?uid from said cylinder to create a differential in pressure in said chambers.