US3824899A - Hydraulic motor having a hydraulic lock control drive pin - Google Patents

Hydraulic motor having a hydraulic lock control drive pin Download PDF

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US3824899A
US3824899A US00390386A US39038673A US3824899A US 3824899 A US3824899 A US 3824899A US 00390386 A US00390386 A US 00390386A US 39038673 A US39038673 A US 39038673A US 3824899 A US3824899 A US 3824899A
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spindle
motor
passage
cylinder bores
hydraulic fluid
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US00390386A
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D Dzioba
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Motors Liquidation Co
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Motors Liquidation Co
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Priority to CA196,522A priority patent/CA993722A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0435—Particularities relating to the distribution members

Definitions

  • ABSTRACT A radial piston hydraulic motor in which a valve, ro- 52 11.5. c1. 91/491, 180/66 F, 91/180 tatably driven by the motor Output, through a drive [51 Int. Cl F0lb 13/06 P Provides timed fluid flow t0 and from the motor [58] Field of Search 417/319; 180/66 F; 91/180, cylinders relative to rotation of the motor output.
  • Radial piston hydraulic motors are generally of two basic types. One type using a stationary housing with a rotatable output shaft, and the other type using a stationary spindle with a rotatable housing. The present invention is concerned with the latter.
  • V 2 the spindle between lands 30 and 32. Fluid communication of the recesses and 28 with each other and with the motor drain cavity is prevented by seals 34.
  • the spindle 10 has a spline portion 36 on which is splined a cylinder housing 38 which is secured to the spindle 10 between a shoulder 40 and a locknut 42 which is threaded onto the spindle 10.
  • the cylinder housing 38 has formed therein a plurality of cylinder bores 44 which are closed at their radial inner surface by sleeve 46.
  • the sleeve 46 has formed therein a plurality of oval shaped ports 48 and a plurality of oval shaped ports 50.
  • the sleeve 46 is positioned in the cylinder housing 38 such that one each of the ports 48 and 50 are aligned with each cylinder bore 44.
  • a piston 52 is slidably disposed in each cylinder bore 44 and is adapted for reciprocation therein as will be described later.
  • Each piston 52 has a pin and roller assembly 54 operatively connected thereto to provide driving connection between the pistons 52 and a cam 56.
  • the cam 56 forms a portion of a motor housing, generally designated, 58 which also includes a pair of side portions 60 and62.
  • FIG. 1 is a sectionalelevational view of a hydraulic motor incorporating the present invention.
  • FIG. 2 is a sectional view taken along 22 of FIG. 1. 6
  • a hydraulic motor having a stationary spindle 10 having formed therein a pair of axial fluid passages 12 and 14 which are adapted to be connected to a hydraulic pump, not shown. Also formed in spindle 10 is an axial passage 16 which provides a drain connection for the fluid motor and is adapted to be connected to a reservoir not shown.
  • the passage 12 is connected to a cross passage 18 which is in fluid communication with a recess 20 formed between lands 22 and 24 on the spindle 10.
  • a passage 14 is connected with a cross passage 26 which is in fluid communication with a recess 28 formed on the cam 56 are secured together by a plurality'of threaded fasteners 64 and are aligned relative to each other by dowel pins 66.
  • the camportion 56 has a plurality of cam lobes 68 against which the pin and roller assemblies 54 are in abutting relationship during operation of the fluid motor.
  • the side portion 60 is rotatably supported on the spindle 10 by a tapered roller bearing 70 and is prevented from axial movement on the spindle by a threaded fastener 72 which secures the tapered bearing 70 between a washer 74 and a shoulder 76 formed in the side portion 60.
  • a plurality of fasteners 78 are secured in the side portion 60 and are adapted to permit a drive wheel, not shown, to be secured to the motor housing 58.
  • the side portion 62 is rotatably supported on the spindle 10 by a tapered roller bearing 80 which is located between a shoulder 82 on a spindle mounting member 84 and a shoulder 86 formed in the side portion 62.
  • the side portion 62 is-also prevented from axial movement by the threaded fastener 72.
  • the mounting member 84 is used to secure the motor to the machine or vehicle on which it is to be used.
  • An interior cavity 88 of the motor housing 58 is in fluid communication with the drain passage 16 through a plurality of passages 90 formed in the side portion 62 such that fluid leakage past the fluid pistons 52 to the cavity 88 can be returned to the reservoir.
  • a hub 92 is secured to the side portion 62 and is rotatably separated from the cylinder housing 38 by a roller bearing 94.
  • the hub 92 has formed therein a recess 96 in which is disposed an enlarged diameter end 98 of a pin 100.
  • the pin 100 has a smaller diameter portion 101 pressed into a valve spool 102 such that the enlarged end 98 abuts the radial face 104 of the valve 102.
  • a blind passage 106 is formed in the pin 100 to a depth which will locate the end of the blind passage 106 at a distance spaced outwardly from the face 104 when the pin is pressed in place.
  • the valve 102 has formed therein a plurality of oval ports 108 which are in fluid communication with the recess 20 on spindle 10. Also formed in the valve 102 are a plurality of oval ports 110 which are in fluid com munication with the recess 28 on the spindle 10. One of the ports 108, and therefore the recess 20, is in fluid communication with the blind passage 106 in the pin 3 100.
  • the ports 108 and 110 are circumferentially separated from each other to provide timed fluid flow to and from the cylinders 44 through ports 48 and 50, when the valve 102 is rotated with the motor housing 58.
  • the pin 100 will shear at the face 104.
  • recess 20 will be in fluid communication with the cavity 88, and therefore drain passage 16, to prevent pressurization of the cylinders 44.
  • the pressure in cavity 88 will increase due to the restricted nature of the drain passage 16, such that the increased pressure in cavity 88 will balance any fluid pressure on the pistons 52 so that the springs 112 will move the pistons inwardly thereby permitting free rotation of the housing 58.
  • a hydraulic motor comprising a spindle; a stator secured to said spindle and having a plurality of radially extending cylinder bores; port means secured to said stator for directing hydraulic fluid to and from said cylinder bores; passage means in said spindle for directing hydraulic fluid to and from said motor; piston means reciprocably disposed in said cylinder bores including roller means at the radially outer ends thereof; rotatablehousing means rotatably supported on said spindle and surrounding said stator and pistons and including an interin cavity and a cam portion adapted to be driven by said roller means upon reciprocation of said piston means; valve means'rotatably disposed between said port means and said spindle for directing timed hydraulic fluid interchange between said cylinder bores and said passage means; and drive connecting means drivingly connected between said valve means and said rotatable housing means for normally maintaining a timed relationship therebetween and including central passage means for permitting hydraulic fluid communication between said passage means directing hydraulic fluid to said motor and said interior cavity when said
  • a hydraulic motor comprising a spindle; a stator secured to said spindle and having a plurality of radially extending cylinder bores; sleeve means secured to said stator having a plurality of cylinder ports therein for directing hydraulic fluid to and from said cylinder bores;
  • passage means in said spindle for directing hydraulic fluid to and from said motor; piston means reciprocably disposed in said cylinder bores including roller means at the radially outer ends thereof; rotatable housing means rotatably supported on said spindle and surrounding said stator and pistons and including an interior cavity and a cam portion adapted to be driven by said roller.
  • valve means rotatably disposed between said sleeve means and said spindle and including a plurality of supply and exhaust ports for directing timed hydraulic fluid interchange between said cylinder ports and said passage means; and drive connecting means drivingly connected between said valve means and said rotatable housing means for normally maintaining a timed relationship therebetween and including pin means secured in said valve means having a portion drivingly connected with said rotatable housing means and a blind passage centrally located in said pin open at one end to one of said supply ports and closed at the other end to normally prevent fluid flow therethrough, said pin being shearable between the ends of said blind passage for providing fluid communication between said one supply port and said interior cavity when said valve means is prevented from rotating with said rotatable housing means.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)

Abstract

A radial piston hydraulic motor in which a valve, rotatably driven by the motor output, through a drive pin, provides timed fluid flow to and from the motor cylinders relative to rotation of the motor output. If the valve should seize in the cylinder housing, the pin will shear, opening a passage therein, to provide a fluid flow connection between the high pressure side of the motor and the motor case to prevent a hydraulic lock from forming in the cylinders.

Description

United States Patent Dzioba 1 July 23, 1974 [54] HYDRAULIC MOTOR HAVING A 3,730,054 5/1973 Dickinson 91 491 HYDRAULIC LOCK CONTROL DRIVE PIN FOREIGN PATENTS OR APPLICATIONS Inventor: Donald Dzioba, Bridgeport, Mich- 198,258 8/1967 U S.S.R 91/491 [73] Assignee: General Motors Corporation,
Detroit Mich. Primary ExammerW1l1|am L. Freeh Attorney, Agent, or FirmDonald F. Scherer [22] F11ed: Aug. 22, 1973' [21] Appl. No.: 390,386 [57] ABSTRACT A radial piston hydraulic motor in which a valve, ro- 52 11.5. c1. 91/491, 180/66 F, 91/180 tatably driven by the motor Output, through a drive [51 Int. Cl F0lb 13/06 P Provides timed fluid flow t0 and from the motor [58] Field of Search 417/319; 180/66 F; 91/180, cylinders relative to rotation of the motor output. If 9 49 1 5 the valve should seize in the cylinder housing, the pin will shear, opening a passage therein, to provide a 5 References Cited fluid flow connection between the high pressure side UNITED STATES PATENTS of the motor and the motor case to prevent a hydraulic lock from forming in the cylinders. 3,092,086 6/1963 Bata1lle 91/481 3,354,786 11/1967 Bedford 91/180 2 Claims, 2 Drawing Figures Radial piston hydraulic motors are generally of two basic types. One type using a stationary housing with a rotatable output shaft, and the other type using a stationary spindle with a rotatable housing. The present invention is concerned with the latter. ln radial piston motors having a stationary spindle and a rotatable housing, it is necessary to use arotatable timing valve disposed between the stationary spindle and the stationary cylinder block, which is secured to the spindle. The rotatable valve is driven by the housingto control the flow of fluid to and from the cylinders. When the hydraulic motor is used as a vehicle wheel drive, it is possible for solid particles to be mixed with the hydraulic fluid. The system filter will normally keep the particles from reaching the pump and motor. However, the,
will be broken to permit high pressure fluid deliveredto the motor to be exhausted. This will prevent high pressure fluid from entering the cylinders to cause a hydraulic lockup of the motor.
V 2 the spindle between lands 30 and 32. Fluid communication of the recesses and 28 with each other and with the motor drain cavity is prevented by seals 34.
The spindle 10 has a spline portion 36 on which is splined a cylinder housing 38 which is secured to the spindle 10 between a shoulder 40 and a locknut 42 which is threaded onto the spindle 10. The cylinder housing 38 has formed therein a plurality of cylinder bores 44 which are closed at their radial inner surface by sleeve 46. The sleeve 46 has formed therein a plurality of oval shaped ports 48 and a plurality of oval shaped ports 50. The sleeve 46 is positioned in the cylinder housing 38 such that one each of the ports 48 and 50 are aligned with each cylinder bore 44. A piston 52 is slidably disposed in each cylinder bore 44 and is adapted for reciprocation therein as will be described later. Each piston 52 has a pin and roller assembly 54 operatively connected thereto to provide driving connection between the pistons 52 and a cam 56.
The cam 56 forms a portion of a motor housing, generally designated, 58 which also includes a pair of side portions 60 and62. The side portions 60 and 62 and It is an object of this invention to provide in an improved radial piston hydraulic motor a drive connection between the motor housing and a distribution valve whereby the distribution valve is normally rotated with the housing to provide timed fluid flow to and from the motor cylinders, and which drive connection will provide an exhaust connection for the high pressure fluid if the valve should be prevented from rotation.
It is another object of this invention to provide in a radial piston hydraulic motor an improved drive connection between the rotatable housing and rotatable valve wherein the drive connection. comprises a pin adapted to be sheared when the valve is prevented from rotating sothat a fluid passage is opened through the pin between the high pressure side of the motor and the motor drain passage.
These and other objects and advantages of the present invention will be more apparent from the following description and drawing in which: i
FIG. 1 is a sectionalelevational view of a hydraulic motor incorporating the present invention; and
FIG. 2 is a sectional view taken along 22 of FIG. 1. 6
Referring to the drawings there is shown a hydraulic motor having a stationary spindle 10 having formed therein a pair of axial fluid passages 12 and 14 which are adapted to be connected to a hydraulic pump, not shown. Also formed in spindle 10 is an axial passage 16 which provides a drain connection for the fluid motor and is adapted to be connected to a reservoir not shown. The passage 12 is connected to a cross passage 18 which is in fluid communication with a recess 20 formed between lands 22 and 24 on the spindle 10. A passage 14 is connected with a cross passage 26 which is in fluid communication with a recess 28 formed on the cam 56 are secured together by a plurality'of threaded fasteners 64 and are aligned relative to each other by dowel pins 66. The camportion 56 has a plurality of cam lobes 68 against which the pin and roller assemblies 54 are in abutting relationship during operation of the fluid motor.
The side portion 60 is rotatably supported on the spindle 10 by a tapered roller bearing 70 and is prevented from axial movement on the spindle by a threaded fastener 72 which secures the tapered bearing 70 between a washer 74 and a shoulder 76 formed in the side portion 60. A plurality of fasteners 78 are secured in the side portion 60 and are adapted to permit a drive wheel, not shown, to be secured to the motor housing 58. The side portion 62 is rotatably supported on the spindle 10 by a tapered roller bearing 80 which is located between a shoulder 82 on a spindle mounting member 84 and a shoulder 86 formed in the side portion 62. The side portion 62 is-also prevented from axial movement by the threaded fastener 72. The mounting member 84 is used to secure the motor to the machine or vehicle on which it is to be used. An interior cavity 88 of the motor housing 58 is in fluid communication with the drain passage 16 through a plurality of passages 90 formed in the side portion 62 such that fluid leakage past the fluid pistons 52 to the cavity 88 can be returned to the reservoir.
A hub 92 is secured to the side portion 62 and is rotatably separated from the cylinder housing 38 by a roller bearing 94. The hub 92 has formed therein a recess 96 in which is disposed an enlarged diameter end 98 of a pin 100. The pin 100 has a smaller diameter portion 101 pressed into a valve spool 102 such that the enlarged end 98 abuts the radial face 104 of the valve 102. A blind passage 106 is formed in the pin 100 to a depth which will locate the end of the blind passage 106 at a distance spaced outwardly from the face 104 when the pin is pressed in place.
The valve 102 has formed therein a plurality of oval ports 108 which are in fluid communication with the recess 20 on spindle 10. Also formed in the valve 102 are a plurality of oval ports 110 which are in fluid com munication with the recess 28 on the spindle 10. One of the ports 108, and therefore the recess 20, is in fluid communication with the blind passage 106 in the pin 3 100. The ports 108 and 110 are circumferentially separated from each other to provide timed fluid flow to and from the cylinders 44 through ports 48 and 50, when the valve 102 is rotated with the motor housing 58.
During the operation of the fluid motor high pressure fluid is delivered via passages 12 and 18 to recess 20, while recess 28 and passages 26 and 14 are'connected toa fluid reservoir; The high pressure fluid, in recess 20, is delivered to the cylinders 44 when the ports 108 are registered with the ports 48. Fluid is expelled from the cylinders 44 through the ports 50 when they are registered with the ports 1 10. Fluid pressure in the cylinders 44 cause the pistons 52 to move radially outward such that the pin and roller assemblies 54 contact the cam lobes 68 to cause the motor housing 58 to rotate in the direction of arrow A. When the rollers 54 have reached the radial outermost point of cam 68, continued rotation of the motor housing 58 forces the rollers 54 and pistons 52 inwardly to expell fluid from the cylinders 44 through ports 50 and 110. When fluid pressure is not admitted to the motor, a pair of garter springs 112 acting on the pin and roller assemblies 54 urge all of the pistons 52 radially inwardly to prevent contact between the cam 56 and the roller and pin assemblies 54. Under this condition the motor housing 58 is free to rotate without the generation of pumping losses within the motor.
If the valve 102 should become seized with the spindle or the sleeve 46, such that rotation of the valve 102 is retarded or prevented, the pin 100 will shear at the face 104. When the pin has sheared the high pressure side of the motor, recess 20 will be in fluid communication with the cavity 88, and therefore drain passage 16, to prevent pressurization of the cylinders 44. If excess fluid is being delivered to the motor at the time of the valve seizure, the pressure in cavity 88 will increase due to the restricted nature of the drain passage 16, such that the increased pressure in cavity 88 will balance any fluid pressure on the pistons 52 so that the springs 112 will move the pistons inwardly thereby permitting free rotation of the housing 58.
From the above description it can be seen that hydraulic lock conditions in the cylinders 44 is prevented when the valve 102 is prevented from rotating. Thus, if the motor is used, for example, as an auxiliary vehicle drive, the wheel could continue to rotate even through the motor becomes inoperative.
Obviously, many modifications and variations of the present invention are possible in light of theabove teachings. It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
What is claimed is: l. A hydraulic motor comprising a spindle; a stator secured to said spindle and having a plurality of radially extending cylinder bores; port means secured to said stator for directing hydraulic fluid to and from said cylinder bores; passage means in said spindle for directing hydraulic fluid to and from said motor; piston means reciprocably disposed in said cylinder bores including roller means at the radially outer ends thereof; rotatablehousing means rotatably supported on said spindle and surrounding said stator and pistons and including an interin cavity and a cam portion adapted to be driven by said roller means upon reciprocation of said piston means; valve means'rotatably disposed between said port means and said spindle for directing timed hydraulic fluid interchange between said cylinder bores and said passage means; and drive connecting means drivingly connected between said valve means and said rotatable housing means for normally maintaining a timed relationship therebetween and including central passage means for permitting hydraulic fluid communication between said passage means directing hydraulic fluid to said motor and said interior cavity when said drive connecting means is brokenand; for preventing hydraulic locking of said piston means in said cylinder bores.
2. A hydraulic motor comprising a spindle; a stator secured to said spindle and having a plurality of radially extending cylinder bores; sleeve means secured to said stator having a plurality of cylinder ports therein for directing hydraulic fluid to and from said cylinder bores;
passage means in said spindle for directing hydraulic fluid to and from said motor; piston means reciprocably disposed in said cylinder bores including roller means at the radially outer ends thereof; rotatable housing means rotatably supported on said spindle and surrounding said stator and pistons and including an interior cavity and a cam portion adapted to be driven by said roller. means upon reciprocation of said piston means; valve means rotatably disposed between said sleeve means and said spindle and including a plurality of supply and exhaust ports for directing timed hydraulic fluid interchange between said cylinder ports and said passage means; and drive connecting means drivingly connected between said valve means and said rotatable housing means for normally maintaining a timed relationship therebetween and including pin means secured in said valve means having a portion drivingly connected with said rotatable housing means and a blind passage centrally located in said pin open at one end to one of said supply ports and closed at the other end to normally prevent fluid flow therethrough, said pin being shearable between the ends of said blind passage for providing fluid communication between said one supply port and said interior cavity when said valve means is prevented from rotating with said rotatable housing means.

Claims (2)

1. A hydraulic motor comprising a spindle; a stator secured to said spindle and having a plurality of radially extending cylinder bores; port means secured to said stator for directing hydraulic fluid to and from said cylinder bores; passage means in said spindle for directing hydraulic fluid to and from said motor; piston means reciprocably disposed in said cylinder bores including roller means at the radially outer ends thereof; rotatable housing means rotatably supported on said spindle and surrounding said stator and pistons and including an interin cavity and a cam portion adapted to be driven by said roller means upon reciprocation of said piston means; valve means rotatably disposed between said port means and said spindle for directing timed hydraulic fluid interchange between said cylinder bores and said passage means; and drive connecting means drivingly connected between said valve means and said rotatable housing means for normally maintaining a timed relationship therebetween and including central passage means for permitting hydraulic fluid communication between said passage means directing hydraulic fluid to said motor and said interior cavity when said drive connecting means is broken and; for preventing hydraulic locking of said piston means in said cylinder bores.
2. A hydraulic motor comprising a spindle; a stator secured to said spindle and hAving a plurality of radially extending cylinder bores; sleeve means secured to said stator having a plurality of cylinder ports therein for directing hydraulic fluid to and from said cylinder bores; passage means in said spindle for directing hydraulic fluid to and from said motor; piston means reciprocably disposed in said cylinder bores including roller means at the radially outer ends thereof; rotatable housing means rotatably supported on said spindle and surrounding said stator and pistons and including an interior cavity and a cam portion adapted to be driven by said roller means upon reciprocation of said piston means; valve means rotatably disposed between said sleeve means and said spindle and including a plurality of supply and exhaust ports for directing timed hydraulic fluid interchange between said cylinder ports and said passage means; and drive connecting means drivingly connected between said valve means and said rotatable housing means for normally maintaining a timed relationship therebetween and including pin means secured in said valve means having a portion drivingly connected with said rotatable housing means and a blind passage centrally located in said pin open at one end to one of said supply ports and closed at the other end to normally prevent fluid flow therethrough, said pin being shearable between the ends of said blind passage for providing fluid communication between said one supply port and said interior cavity when said valve means is prevented from rotating with said rotatable housing means.
US00390386A 1973-08-22 1973-08-22 Hydraulic motor having a hydraulic lock control drive pin Expired - Lifetime US3824899A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913455A (en) * 1973-04-09 1975-10-21 Newage Engineers Ltd Radial-piston rotary hydrostatic machines
US3978771A (en) * 1975-04-21 1976-09-07 Clark Equipment Company Mechanical piston retention for free wheeling
US3999465A (en) * 1974-11-01 1976-12-28 Clark Equipment Company Magnet piston retention for free wheeling
US4009643A (en) * 1975-02-26 1977-03-01 Heinz Thumm Hydraulic motor for rotating the bucket of an excavating machine
US4136602A (en) * 1976-05-24 1979-01-30 Lenz Leonard L Hydraulic motor
US6129169A (en) * 1997-06-06 2000-10-10 Sauer Inc. Mobile work vehicle with compact axle assembly
US20050076888A1 (en) * 2003-10-08 2005-04-14 Denso Corporation Safety fuel injection pump
US20100225157A1 (en) * 2009-03-05 2010-09-09 Tuthill Corporation Spindle with hydraulic passage arrangement and method of manufacture
US8276376B2 (en) 2009-05-06 2012-10-02 Terra Drive Systems, Inc. Hydraulic circuit with selectively actuated motor
US20210354511A1 (en) * 2018-10-23 2021-11-18 Poclain Hydraulics Industrie Hydraulic Motor for a Vehicle Steered Wheel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU198258A1 (en) * Ю. И. Ловцов , А. Я. Рогов RADIAL PISTON i IDROMOGOR
US3092086A (en) * 1958-07-18 1963-06-04 Sulzer Ag Feed-water control for forcedcirculation boilers
US3354786A (en) * 1960-12-21 1967-11-28 Chamberlain Ind Ltd Hydraulic motors
US3730054A (en) * 1971-06-02 1973-05-01 Fmc Corp Air motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU198258A1 (en) * Ю. И. Ловцов , А. Я. Рогов RADIAL PISTON i IDROMOGOR
US3092086A (en) * 1958-07-18 1963-06-04 Sulzer Ag Feed-water control for forcedcirculation boilers
US3354786A (en) * 1960-12-21 1967-11-28 Chamberlain Ind Ltd Hydraulic motors
US3730054A (en) * 1971-06-02 1973-05-01 Fmc Corp Air motor

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913455A (en) * 1973-04-09 1975-10-21 Newage Engineers Ltd Radial-piston rotary hydrostatic machines
US3999465A (en) * 1974-11-01 1976-12-28 Clark Equipment Company Magnet piston retention for free wheeling
US4009643A (en) * 1975-02-26 1977-03-01 Heinz Thumm Hydraulic motor for rotating the bucket of an excavating machine
US3978771A (en) * 1975-04-21 1976-09-07 Clark Equipment Company Mechanical piston retention for free wheeling
US4136602A (en) * 1976-05-24 1979-01-30 Lenz Leonard L Hydraulic motor
US6129169A (en) * 1997-06-06 2000-10-10 Sauer Inc. Mobile work vehicle with compact axle assembly
US20050076888A1 (en) * 2003-10-08 2005-04-14 Denso Corporation Safety fuel injection pump
US7080631B2 (en) * 2003-10-08 2006-07-25 Denso Corporation Safety fuel injection pump
US20100225157A1 (en) * 2009-03-05 2010-09-09 Tuthill Corporation Spindle with hydraulic passage arrangement and method of manufacture
US8230772B2 (en) 2009-03-05 2012-07-31 Terra Drive Systems, Inc. Spindle with hydraulic passage arrangement and method of manufacture
US8276376B2 (en) 2009-05-06 2012-10-02 Terra Drive Systems, Inc. Hydraulic circuit with selectively actuated motor
US8813487B1 (en) 2009-05-06 2014-08-26 Terra Drive Systems, Inc. Hydraulic wheel drive system with selectively actuated motor
US20210354511A1 (en) * 2018-10-23 2021-11-18 Poclain Hydraulics Industrie Hydraulic Motor for a Vehicle Steered Wheel
US12090787B2 (en) * 2018-10-23 2024-09-17 Poclain Hydraulics Industrie Hydraulic motor for a vehicle steered wheel

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