Patent US3739692A successfully refreshed from Google Patents.
US3739692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swashplate and like hydraulic machines
Assignee: Reyrolle Hydraulics Ltd
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Filing: 1968-09-06
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Granted: 1973-06-19
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Expires: 1988-09-06
Abstract
Abstract In a swashplate hydraulic machine each piston is connected by a ball joint to a slipper pad, and actuated by a swashplate assembly comprising a rotary slipper retaining plate rigidly connected to a rotary running plate between which the slipper pads are trapped and can slide, and which are backed up by and mounted to rotate in contact with a stationary cam plate.
Inventors
- 👤 G Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:12
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/26; F04B1/30; F04B1/32; F04B1/324
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
A swashplate hydraulic machine, comprising: a rotor including a ring of cylinders having axes substantially parallel to the axis of rotation of said rotor, each cylinder including a piston connected to a disc-shaped slipper pad by a ball joint, a swashplate assembly rotatable about a stationary swashplate axis inclined at an angle to the axis of rotation of said rotor and engaging with said slipper pads to impart cyclic movement to said pistons as said rotor rotates, said swashplate assembly including a running plate having front and rear surfaces and a slipper retaining plate mounted to rotate about said swashplate axis, means for rigidly securing said running plate to said slipper retaining plate to prevent relative axial and rotative movement between them both, each said slipper pad is slidably retained between said running plate front surface and an opposed surface of said slipper retaining plate to positively prevent each slipper pad from tilting with respect to said swashplate axis, and a stationary cam plate in contact with said running plate rear surface.
Claim 2
Dependent Claim
172 words
A swashplate hydraulic machine, comprising: a rotor including a ring of cylinders having axes substantially parallel to the axis of rotation of said rotor, each cylinder including a piston connected to a disc-shaped slipper pad by a ball joint, a swashplate assembly rotatable about a stationary swashplate axis inclined at an angle to the axis of rotation of said rotor and engaging with said slipper pads to impart cyclic movement to said pistons as said rotor rotates, said swashplate assembly including a running plate having front and rear surfaces and a slipper retaining plate mounted to rotate about said swashplate axis, means for rigidly securing said running plate to said slipper retaining plate to prevent relative axial and rotative movement between them both, each said slipper pad is slidably retained between said running plate front surface and an opposed surface of said slipper retaining plate to positively prevent each slipper pad from tilting with respect to said swashplate axis, and a stationary cam plate in contact with said running plate rear surface.
Claim 3
Dependent Claim
151 words
A swashplate hydraulic machine as in claim 1 wherein each of said slipper pads has a pressure balancing recess in its surface opposing said running plate front surface and a passage extending from the associated cylinder to said pressure balancing recess, said stationary cam plate has pairs of arcuate recesses in its surface contacting said running plate, said running plate has holes each interconnecting the respective one of said pressure balancing recesses with a respective one of said pairs of arcuate recesses to enable a liquid to be forced between said slipper pads and said retaining plate front surface, and wherein the alignment of said pressure balancing recesses and said holes is maintained by said means for rigidly securing said running plate to said slipper retaining plate, whereby the forces exerted by said pistons on said slipper pads and the front surface of said retaining plate are reduced by said liquid.
Claim 4
Dependent Claim
52 words
A machine as claimed in claim 1 wherein said machine further comprises a fixed surface and in which the face of the cam plate remote from the running plate includes a surface of revolution about A transverse axis engaging said fixed surface to permit adjustment of the inclination of the swashplate axis.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |