Fluid device

Claim 2

A fluid pressure energy translating device of the axial piston type comprising: a housing; a cylinder barrel rotatably mounted about its longitudinal axis within said housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaces, each of said yoke support pins having a radial thickness as measured from said piston engaging bearing surface to the periphery of the support pin arcuate bearing surface which is approximately 40 percent of the longitudinal thickness of said movable yoke as measured from said piston engaging bearing surface; means for varying the inclination of said piston engaging bearing surface, said last mentioned means cooperating with said movable yoke to pivot said movable yoke about an axis defined by said arcuately shaped bearing surfaces of said support pins, said means for varying the inclination of said piston engaging bearing surface comprising an arm member carried by and radially extending from one of said support pins and pivotable therewith about the axes of sAid support pins, and a displacement varying mechanism carried externally of said housing and operatively coupled to said arm member to pivot said arm and said movable member about the longitudinal axes of said support pins, said displacing varying mechanism comprising a second housing carried by said first housing, said second housing having a longitudinal bore with a sleeve member adapted to be selectively reciprocated therein, said sleeve member having an internal threaded surface, a threaded member rotatably mounted about an axis concentric with the longitudinal axis of said second housing bore and restrained against movement along said last mentioned longitudinal axis, said threaded member having a threaded portion engaging said sleeve threaded surface such that rotation of said threaded member in opposite directions causes relative reciprocal movement between said sleeve member and said second housing bore, said sleeve member being operatively coupled through an aperture in said housing arm member to pivot said arm member and said movable yoke about the axes of said support pins.

Claim 3

A fluid pressure energy translating device of the axial piston type comprising: a housing having a longitudinal bore; a cylinder barrel rotatably mounted about its longitudinal axis within said housing bore, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; thrust plate means having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said piston engaging bearing surface being constructed of a sintered metal; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft; bearing means carried at one end of said housing bore, said bearing means mounting said shaft for rotational movement, said thrust plate means being mounted in said housing bore and having a portion thereof in abutment with said last-mentioned bearing means to provide both proper radial alignment of said thrust plate means with said shaft and proper alignment of said thrust plate means with said cylinder barrel when said thrust plate means is mounted on said bearing means, and wherein said one end of said cylinder barrel has a plurality of elevated arcuately spaced bearing pads, said bearing pads being radially outwardly spaced from said cylinder ports, the inner cylinder port facing wall of each of said bearing pads having a concave contour.

Claim 4

A fluid pressure energy translating device of the axial piston type comprising: a housing having a longitudinal bore; a cylinder barrel rotatably mounted about its longitudinal axis within said housing bore, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; thrust plate means having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said piston engaging bearing surface being constructed of a sintered metal; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft; bearing means carried at one end of said housing bore, said bearing means mounting said shaft for rotational movement, said thrust plate means being mounted in said housing bore and having a portion thereof in abutment with said last-mentioned bearing means to provide both proper radial alignment of said thrust plate means with said shaft and proper alignment of said thrust plate means with said cylinder barrel when said thrust plate means is mounted on said bearing means, and wherein said one end of said cylinder barrel has a plurality of elevated arcuately spaced bearing pads, said bearing pads being radially outwardly spaced from said cylinder ports, the inner cylinder port facing wall of each of said bearing pads having a concave contour.

Claim 5

A fluid pressure energy translating device of the axial piston type comprising: a housing having a longitudinal bore; a cylinder barrel rotatably mounted about its longitudinal axis within said housing bore, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; thrust plate means having a piston engaging bearing surface on the side thereof facing the other eNds of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said piston engaging bearing surface being constructed of a sintered metal; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft; bearing means carried at one end of said housing bore, said bearing means mounting said shaft for rotational movement, said thrust plate means being mounted in said housing bore and having a portion thereof in abutment with said last-mentioned bearing means to provide both proper radial alignment of said thrust plate means with said shaft and proper alignment of said thrust plate means with said cylinder barrel when said thrust plate means is mounted on said bearing means, said thrust plate means comprises a support member carried in said housing bore and having a portion thereof in abutment with said bearing means to provide a proper radial alignment of said support member with said shaft, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having said piston engaging bearing surface formed on the said thereof facing said other ends of said pistons, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaces; means for varying the inclination of said piston engaging surface; bearing means having an outer race carried by said housing concentric with said housing bore, said outer race having a portion of one side supported by each said support member; an inner race carried around a portion of the peripheral surface of said cylinder barrel; a plurality of roller bearings disposed between said inner and outer races; and said means for varying the inclination of said movable yoke comprising a pair of spaced sleeve members each disposed along axes paralleling the axis of said shaft and radially spaced from the peripheral surface of said cylinder barrel, each of said sleeve members having one end of a piston member reciprocably mounted therein, the other ends of said piston members adapted to abut a portion of said movable yoke to pivot said movable yoke about the longitudinal axes of said support pins, said sleeves being radially spaced a distance from the centerline of said shaft axis to abut the outer race of said bearing means to maintain said outer race in a supporting abutment with said support member, said piston members being carried within said sleeves and so spaced from said longitudinal axis of said shaft as to freely reciprocate in a spaced relationship with respect to the outer periphery of said outer race.

Claim 6

A fluid pressure energy translating device of the axial piston type comprising: a housing having a longitudinal bore; a cylinder barrel rotatably mounted about its longitudinal axis within said housing bore, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; thrust plate means having a piston engaging bearing surface on the side thereof facing the other eNds of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said piston engaging bearing surface being constructed of a sintered metal; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft; bearing means carried at one end of said housing bore, said bearing means mounting said shaft for rotational movement, said thrust plate means being mounted in said housing bore and having a portion thereof in abutment with said last-mentioned bearing means to provide both proper radial alignment of said thrust plate means with said shaft and proper alignment of said thrust plate means with said cylinder barrel when said thrust plate means is mounted on said bearing means, said thrust plate means comprises a support member carried in said housing bore and having a portion thereof in abutment with said bearing means to provide a proper radial alignment of said support member with said shaft, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having said piston engaging bearing surface formed on the said thereof facing said other ends of said pistons, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaces; means for varying the inclination of said piston engaging surface; bearing means having an outer race carried by said housing concentric with said housing bore, said outer race having a portion of one side supported by each said support member; an inner race carried around a portion of the peripheral surface of said cylinder barrel; a plurality of roller bearings disposed between said inner and outer races; and said means for varying the inclination of said movable yoke comprising a pair of spaced sleeve members each disposed along axes paralleling the axis of said shaft and radially spaced from the peripheral surface of said cylinder barrel, each of said sleeve members having one end of a piston member reciprocably mounted therein, the other ends of said piston members adapted to abut a portion of said movable yoke to pivot said movable yoke about the longitudinal axes of said support pins, said sleeves being radially spaced a distance from the centerline of said shaft axis to abut the outer race of said bearing means to maintain said outer race in a supporting abutment with said support member, said piston members being carried within said sleeves and so spaced from said longitudinal axis of said shaft as to freely reciprocate in a spaced relationship with respect to the outer periphery of said outer race.

Claim 7

The fluid pressure energy translating device defined in claim 3 wherein the yoke facing ends of said roller bearings and said inner race are substantially flush; a portion of said inner race extending beyond said other end of said cylinder barrel and having an annular inclined inner surface flared upwardly from said other cylinder barrel end and toward said yoke facing end of said inner race.

Claim 8

A fluid pressure energy translating device of the axial piston type comprising: a housing constructed of a plastic material; a cylinder barrel rotatably mounted about its longitudinal axis within said plastic housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a pluRality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaces, each of said yoke support pins having a radial thickness as measured from said piston engaging bearing surface to the periphery of the support pin arcuate bearing surface which is approximately 40 percent of the longitudinal thickness of said movable yoke as measured from said piston engaging bearing surface; means for varying the inclination of said piston engaging bearing surface, said last mentioned means cooperating with said movable yoke to pivot said movable yoke about an axis defined by said arcuately shaped bearing surfaces of said support pins, said means for varying the inclination of said piston engaging bearing surface comprising an arm member carried by and radially extending from one of said support pins, and a displacement varying mechanism carried externally of said plastic housing and operatively coupled to said arm member to pivot said arm member about the axes of said support pins, said displacement varying mechanism comprising a second housing carried by said plastic housing, said second housing having a longitudinal bore with a sleeve member adapted to be reciprocated therein, said sleeve member having an internal threaded surface, a threaded member rotatably mounted in a fixed position in said housing and adapted to rotate about a longitudinal axis of said second housing bore, said threaded member having a portion thereof engaging said sleeve member such that rotation of said threaded member in opposite directions produces reciprocal moving between such sleeve member and said second housing bore, said sleeve member being operatively coupled through an aperture in said plastic housing to said arm member to pivot said arm member and said movable yoke about the axes of said support pins.

Claim 9

A fluid pressure energy translating device of the axial piston type comprising: a housing constructed of a plastic material; a cylinder barrel rotatably mounted about its longitudinal axis within said plastic housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a pluRality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaces, each of said yoke support pins having a radial thickness as measured from said piston engaging bearing surface to the periphery of the support pin arcuate bearing surface which is approximately 40 percent of the longitudinal thickness of said movable yoke as measured from said piston engaging bearing surface; means for varying the inclination of said piston engaging bearing surface, said last mentioned means cooperating with said movable yoke to pivot said movable yoke about an axis defined by said arcuately shaped bearing surfaces of said support pins, said means for varying the inclination of said piston engaging bearing surface comprising an arm member carried by and radially extending from one of said support pins, and a displacement varying mechanism carried externally of said plastic housing and operatively coupled to said arm member to pivot said arm member about the axes of said support pins, said displacement varying mechanism comprising a second housing carried by said plastic housing, said second housing having a longitudinal bore with a sleeve member adapted to be reciprocated therein, said sleeve member having an internal threaded surface, a threaded member rotatably mounted in a fixed position in said housing and adapted to rotate about a longitudinal axis of said second housing bore, said threaded member having a portion thereof engaging said sleeve member such that rotation of said threaded member in opposite directions produces reciprocal moving between such sleeve member and said second housing bore, said sleeve member being operatively coupled through an aperture in said plastic housing to said arm member to pivot said arm member and said movable yoke about the axes of said support pins.

Claim 10

A fluid pressure energy translating device the axial piston type comprising: a housing; a cylinder barrel rotatably mounted about its longitudinal axis within said housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaceS, each of said yoke support pins having a radial thickness as measured from said piston engaging bearing surface to the periphery of the support pin arcuate bearing surface which is approximately 40 percent of the longitudinal thickness of said movable yoke as measured from said piston engaging bearing surface; means for varying the inclination of said piston engaging bearing surface, said last mentioned means cooperating with said movable yoke to pivot said movable yoke about an axis defined by said arcuately shaped bearing surfaces of said support pins, said housing having a longitudinal bore; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft, and bearing means carried at one end of said housing mounting said shaft for rotational movement, said support member being mounted in said housing bore and having a portion thereof in abutment with said last mentioned bearing means to provide proper radial alignment of said support member with said shaft, said movable yoke being carried by said support member such that said movable yoke is properly aligned with said cylinder barrel when said yoke support is mounted on said bearing means.

Claim 11

A fluid pressure energy translating device the axial piston type comprising: a housing; a cylinder barrel rotatably mounted about its longitudinal axis within said housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke constructed of a sintered metal material and having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having laterally extending integral support pins with arcuately shaped bearing surfaces pivotably supported in said support member arcuately shaped bearing surfaceS, each of said yoke support pins having a radial thickness as measured from said piston engaging bearing surface to the periphery of the support pin arcuate bearing surface which is approximately 40 percent of the longitudinal thickness of said movable yoke as measured from said piston engaging bearing surface; means for varying the inclination of said piston engaging bearing surface, said last mentioned means cooperating with said movable yoke to pivot said movable yoke about an axis defined by said arcuately shaped bearing surfaces of said support pins, said housing having a longitudinal bore; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft, and bearing means carried at one end of said housing mounting said shaft for rotational movement, said support member being mounted in said housing bore and having a portion thereof in abutment with said last mentioned bearing means to provide proper radial alignment of said support member with said shaft, said movable yoke being carried by said support member such that said movable yoke is properly aligned with said cylinder barrel when said yoke support is mounted on said bearing means.

Claim 12

A fluid pressure energy translating device of the axial piston type comprising: a housing having a longitudinal bore; a cylinder barrel rotatably mounted about its longitudinal axis within said housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having complementary shaped bearing surfaces cooperating with said support member shaped bearing surfaces; means for varying the inclination of said piston engaging bearing surface, said last-mentioned means cooperating with said movable yoke to pivot said movable yoke with respect to said support member shaped bearing surfaces; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft, and bearing means carried at one end of said housing mounting said shaft for rotational movement, said support member being mounted in said housing bore and having a portion thereof in abutment with said last-mentioned bearing means to provide proper radial alignment of said support member with said shaft, said movable yoke being carried by said support member such that said movable yoke is properly aligned with said cylinder barrel when said yoke support is mounted on said bearing means.

Claim 13

A fluid pressure energy translating device of the axial piston type comprising: a housing having a longitudinal bore; a cylinder barrel rotatably mounted about its longitudinal axis within said housing, said cylinder barrel having a plurality of arcuately spaced cylinder bores communicating with both longitudinal ends of said cylinder barrel; a valve face having arcuate passages, said valve face and one end of said cylinder barrel being disposed for relative rotary movement, with said cylinder barrel bores communicating successively with said arcuate passages as said cylinder barrel rotates; a plurality of pistons with inner ends disposed for reciprocal movement within said cylinder bores at the other end of said cylinder barrel; a support member carried within said housing, said support member having shaped bearing surfaces facing toward said other end of said cylinder barrel; a movable yoke having a piston engaging bearing surface on the side thereof facing the other ends of said pistons and cooperating therewith for imparting said reciprocal movement to said pistons within said cylinder barrel bores as said cylinder barrel rotates relative to said valve face, said movable yoke having complementary shaped bearing surfaces cooperating with said support member shaped bearing surfaces; means for varying the inclination of said piston engaging bearing surface, said last-mentioned means cooperating with said movable yoke to pivot said movable yoke with respect to said support member shaped bearing surfaces; a shaft rotatably mounted in said housing along the longitudinal axis of said bore, said cylinder barrel being drivingly connected to and rotatable with said shaft, and bearing means carried at one end of said housing mounting said shaft for rotational movement, said support member being mounted in said housing bore and having a portion thereof in abutment with said last-mentioned bearing means to provide proper radial alignment of said support member with said shaft, said movable yoke being carried by said support member such that said movable yoke is properly aligned with said cylinder barrel when said yoke support is mounted on said bearing means.

Claim 14

The fluid pressure energy translating device defined in claim 7 wherein said housing is constructed of a plastic material.

Claim 15

The fluid pressure energy translating device defined in claim 8 wherein said plastic housing is longitudinally precompressed a predetermined amount which is a function of the force generated by the pressure of the fluid acting against the inner ends of said pistons, said force tending to longitudinally expand said plastic housing.

Claim 16

The fluid pressure energy translating device defined in claim 7 whereiN said shaped bearing surfaces on said support member are constructed of a plastic material.

Claim 17

The fluid pressure energy translating device defined in claim 7, further comprising: a bearing means having an outer race carried by said housing concentrically with said housing bore, an inner race carried around the peripheral surface of said cylinder barrel, and a plurality of roller bearings disposed between said inner and outer races, the yoke facing end of each of said roller bearings and said inner race being substantially flush, a portion of said inner race extending beyond the other end of said cylinder barrel and having an annular inclined inner surface flared upwardly from said other cylinder barrel end toward said yoke facing end of said inner race.

Claim 18

The fluid device defined in claim 7 wherein said support member is constructed from a sintered metal material.

Claim 19

The device defined in claim 7 further comprising an arcuately shaped member carried by said support member and defining said support member shaped bearing surface, said arcuately shaped bearing surfaces of said movable yoke support pins being received and supported by said bearing members, said bearing members being fabricated from a plastic material.

Claim 20

The device defined in claim 7 further comprising bearing means having an outer race carried within said housing; an inner race carried around a portion of the peripheral surface of said cylinder barrel; and a plurality of roller bearings disposed between said inner and outer races, said bearing means providing radial support for said cylinder barrel as said cylinder barrel rotates, said bearing means being properly axially positioned within said housing by the abutment of one side of one of said bearing races with a portion of said support member.

Claim 21

The fluid pressure energy translating device defined in claim 45, wherein said support member has a pair of transversely spaced arcuately shaped bearing surfaces facing toward said other end of said cylinder barrel; a said movable yoke having said piston engaging bearing surface formed on the side thereof facing said other ends of said pistons, said movable yoke having laterally extending integral support pins with said complementary shaped bearing surfaces being pivotably supported in said support member arcuately shaped bearing surfaces; and means for varying the inclination of said piston engaging surface.

Claim 22

The fluid pressure energy translating device defined in claim 15, wherein said means for varying the inclination of said piston engaging surface cooperates with said movable yoke to pivot said movable yoke about an axis defined by said arcuately shaped bearing surfaces of said support pins.

Claim 23

The fluid pressure energy translating device in claim 15 wherein said means for varying the inclination of said movable yoke comprises: an arm member carried at the end of one of said support pins and pivotable therewith about the axes of said support pins, and a displacement varying mechanism carried externally of said housing and operatively coupled to said arm member to pivot said arm member and said movable yoke about the axes of said support pins.

Claim 24

The fluid pressure energy translating device defined in claim 17 wherein said displacement varying mechanism comprises: a second housing carried by said first housing and having a bore disposed along an axis extending transversely of said longitudinal axis, a manually operated shaft rotatably mounted in said second housing bore, a second arm member radially extending from said manually operated shaft and operatively coupled through an aperture in said device housing to said first mentioned arm member to pivot said first mentioned arm and said movable yoke about the axes of said support pins as said manually operated shaft is rotated in said second housing bore.

Claim 25

The fluid pressure energy translating device defined in claim 17 wherein said displacement varying mechanism carried comprises: a second housing attached to said housinG, said second housing having a bore with a pressure responsive member slidably mounted therein and biased to a predetermined position, valve means responsive to a predetermined operating pressure of said fluid device to supply a second pressure of predetermined value to said pressure responsive member to move said pressure responsive member from said predetermined position, said pressure responsive member being operatively coupled to said arm member through an aperture in said device housing to pivot said arm member and said movable yoke about the axes of said support pins as said pressure responsive piston moves from said predetermined position.

Claim 26

The fluid pressure energy translating device defined in claim 15, wherein said housing is constructed of a plastic material.

Claim 27

The fluid pressure energy translating device defined in claim 20 wherein said means for varying the inclination of said movable yoke comprises: an arm member carried by and radially extending from one of said support pins and pivotable therewith about the axes of said support pins, and a displacement varying mechanism carried externally of said housing and operably coupled to said arm member to pivot said arm member about said axes of said support pins, said displacement varying mechanism comprising: a second housing having a bore disposed along on axis extending transversely of said shaft axis; a manually operated shaft rotatably mounted in said second housing bore, a second arm member radially extending from said second manually operated shaft and operatively coupled through an aperture in said plastic housing to said first mentioned arm member to pivot said first mentioned arm and said movable yoke about the axes of said support pins as said manually operated shaft is rotated in said second housing bore.

Claim 28

The fluid pressure energy translating device defined in claim 20 wherein said means for varying the inclination of said thrust plate movable yoke comprises: an arm member carried by and radially extending from one of said support pins and pivotable therewith along the axes of said support pins; and a displacement varying mechanism carried externally of said plastic housing and operatively coupled to through an aperture in said plastic housing said arm member to pivot said arm member about the longitudinal axes of said support pins, said displacement varying mechanism comprising: the second housing attached to said plastic housing and having a bore with the pressure responsive member slidably mounted therein and biased to a predetermined position; valve means responsive to a predetermined operating pressure of said fluid device to supply a second pressure of a predetermined value to said pressure response member to move said pressure responsive member from said predetermined position, said pressure responsive member being operatively coupled to said arm member to pivot said arm member and said movable yoke about the axes of said support pins as said pressure responsive member moves from said predetermined position.

Claim 29

The fluid pressure energy translating device defined in claim 20 wherein said plastic housing is longitudinally precompressed a predetermined amount which is a function of the longitudinal expansion forces exerted on said plastic housing by the pressure of the fluid acting against the inner ends of said pistons within said cylinder barrel bores.