Hydraulic device

Claim 2

In a hydraulic device having an internally toothed cylindrical stator, an externally toothed rotor disposed within the stator and movable orbitally and rotationally relatively thereto to provide pressurized fluid pockets between the teeth thereof and a casing surrounding the stator in radially spaced relation thereto to provide an annular chamber therebetween, the improvement of means forming a metal sleeve encircling the stator to place the stator under a mechanically imposed compressive hoop stress ad increase the high fluid pressure capabilites thereof.

Claim 3

The invention as defined in claim 1 wherein said stator comprises an annular ring made of sintered iron.

Claim 4

The invention as defined in claim 1 wherein said sleeve is made of steel.

Claim 5

The invention as defined in claim 1 wherein said sleeve is press fit on said stator.

Claim 6

The invention as defined in claim 1 and including means for hydraulically pressurizing said chamber between said sleeve and said casing.

Claim 7

A hydraulic device operable as a puMp and as a motor comprising a casing having a chamber formed therewithin, a gerotor mechanism in said chamber including a stationary internally toothed stator and an externally toothed rotor, said stator comprising a sintered iron annular ring disposed in spaced relation to said casing and having tubular vanes mounted on the inner periphery thereof to form the teeth of the stator, said rotor being disposed within said stator and in meshing engagement therewith for orbital and rotational movement relative to said stator during operation of said device to form expanding and contracting fluid pockets between the teeth of said stator, means forming a pair of pressurized fluid openings in said casing, means communicating said openings with said pockets in timed relation to the relative movement of said rotor and said stator and including means communicating one of said openings with the space between said casing and said stator to impose a hydraulic compressive hoop stress on said stator.

Claim 8

A hydraulic device operable as a puMp and as a motor comprising a casing having a chamber formed therewithin, a gerotor mechanism in said chamber including a stationary internally toothed stator and an externally toothed rotor, said stator comprising a sintered iron annular ring disposed in spaced relation to said casing and having tubular vanes mounted on the inner periphery thereof to form the teeth of the stator, said rotor being disposed within said stator and in meshing engagement therewith for orbital and rotational movement relative to said stator during operation of said device to form expanding and contracting fluid pockets between the teeth of said stator, means forming a pair of pressurized fluid openings in said casing, means communicating said openings with said pockets in timed relation to the relative movement of said rotor and said stator and including means communicating one of said openings with the space between said casing and said stator to impose a hydraulic compressive hoop stress on said stator.

Claim 9

A hydraulic motor-pump device comprising a casing having a fluid inlet opening, a fluid outlet opening and a chamber formed therein, a gerotor mechanism in said chamber including an internally toothed gear member having a peripheral wall and an externally toothed gear member within the internally toothed gear member and disposed in meshing engagement therewith to form alternately expanding and contracting pockets between the teeth of the internally toothed gear member upon operation of said gerotor mechanism, means for providing influx and efflux of fluid into and out of said pockets in timed relation to the relative movement of said internally and externally toothed gear members including a commutator valve plate operatively connected to said gerotor mechanism and fluid passage means communicating said commutator valve plate and said fluid inlet and outlet openings, said fluid passage means including the peripheral wall of said internally toothed gear member whereby a pressurized fluid chamber is provided about the periphery of said internally toothed gear member to impose a hydraulic compressive hoop stress thereon.

Claim 10

A hydraulic motor-pump device comprising a casing having a fluid inlet opening, a fluid outlet opening and a chamber formed therein, a gerotor mechanism in said chamber including an internally toothed gear member having a peripheral wall and an externally toothed gear member within the internally toothed gear member and disposed in meshing engagement therewith to form alternately expanding and contracting pockets between the teeth of the internally toothed gear member upon operation of said gerotor mechanism, means for providing influx and efflux of fluid into and out of said pockets in timed relation to the relative movement of said internally and externally toothed gear members including a commutator valve plate operatively connected to said gerotor mechanism and fluid passage means communicating said commutator valve plate and said fluid inlet and outlet openings, said fluid passage means including the peripheral wall of said internally toothed gear member whereby a pressurized fluid chamber is provided about the periphery of said internally toothed gear member to impose a hydraulic compressive hoop stress thereon.

Claim 11

The invention as defined in claim 7 wherein said internally toothed gear member is imposed stationarily within said chamber.

Claim 12

The invention as defined in claim 7 wherein said internally toothed gear member is formed of sintered iron.

Claim 13

In a hydraulic device including a gerotor mechanism having an internally toothed cylindrical gear and an externally toothed gear disposed within the internally toothed gear and movable orbitally and rotationally relatively thereto to provide pressurized fluid pockets between the teeth thereof, the improvement of means forming a metal sleeve encircling the internally toothed gear to place the same under a mechanically imposed compressive hoop stress and to increase the high-pressure capabilities thereof.

Claim 14

In a hydraulic device including a gerotor mechanism having an internally toothed cylindrical gear and an externally toothed gear disposed within the internally toothed gear and movable orbitally and rotationally relatively thereto to provide pressurized fluid pockets between the teeth thereof, the improvement of means forming a metal sleeve encircling the internally toothed gear to place the same under a mechanically imposed compressive hoop stress and to increase the high-pressure capabilities thereof.

Claim 15

The invention as defined in claim 10 wherein said internally toothed gear is made of sintered iron. 12 A hydraulic device operable as a pump and as a motor comprising a casing having a chamber formed therewithin, a gerotor mechanism in said chamber including a stationary internally toothed stator and an externally toothed rotor, said stator comprising a sintered iron annular ring disposed in spaced relation to said casing and having tubular vanes mounted on the inner periphery thereof to form the teeth of the stator, said rotor being disposed within said stator and in meshing engagement therewith for orbital and rotational movement relative to said stator during operation of said device to form expanding and contracting fluid pockets between the teeth of said stator, means forming a pair of pressurized fluid openings in said casing, means communicating said openings with said pockets in timed relation to the relative movement of said rotor and said stator and including means communicating one of said openings with the space betwEen said casing and said stator to impose a hydraulic compressive hoop stress on said stator, and means forming a metal sleeve strapped under tension around the periphery of said stator to impose a mechanical compressive stress of said stator.

Claim 16

A hydraulic motor-pump device comprising a casing having fluid inlet opening, a fluid outlet opening and a chamber formed therein, a gerotor mechanism in said chamber including an internally toothed gear member having a peripheral wall and an externally toothed gear member within the internally toothed gear member and disposed in meshing engagement therewith to form alternately expanding and contracting pockets between the teeth of the internally toothed gear member upon operation of said gerotor mechanism, means for providing influx and efflux of fluid into and out of said pockets in timed relation to the relative movement of said internally and externally toothed gear members including a commutator valve plate operatively connected to said gerotor mechanism and fluid passage means communicating said commutator valve plate and said fluid inlet and outlet openings, said fluid passage means including the peripheral wall of said internally toothed gear member whereby a pressurized fluid chamber is provided about the periphery of said internally toothed gear member to impose a hydraulic compressive hoop stress thereon, and a steel sleeve around the peripheral wall of the internally toothed gear member under tension to impose a mechanical compressive hoop stress on said internally toothed gear member.

Claim 17

A hydraulic motor-pump device comprising a casing having fluid inlet opening, a fluid outlet opening and a chamber formed therein, a gerotor mechanism in said chamber including an internally toothed gear member having a peripheral wall and an externally toothed gear member within the internally toothed gear member and disposed in meshing engagement therewith to form alternately expanding and contracting pockets between the teeth of the internally toothed gear member upon operation of said gerotor mechanism, means for providing influx and efflux of fluid into and out of said pockets in timed relation to the relative movement of said internally and externally toothed gear members including a commutator valve plate operatively connected to said gerotor mechanism and fluid passage means communicating said commutator valve plate and said fluid inlet and outlet openings, said fluid passage means including the peripheral wall of said internally toothed gear member whereby a pressurized fluid chamber is provided about the periphery of said internally toothed gear member to impose a hydraulic compressive hoop stress thereon, and a steel sleeve around the peripheral wall of the internally toothed gear member under tension to impose a mechanical compressive hoop stress on said internally toothed gear member.