Patent US3643549A successfully refreshed from Google Patents.
US3643549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial piston pump or motor
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1970-07-27
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Granted: 1972-02-22
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Expires: 1990-07-27
Abstract
Abstract An axial piston pump or motor comprises a cylinder barrel fixedly mounted on a rotating shaft, a plurality of cylindrical bores formed axially in the cylinder barrel, piston slidably fitted in the associated bores, a swashplate adjustably arranged at a desired inclination angle with respect to the axis of the shaft, slipper pads each engaged with an end of each piston and a retainer ring for keeping the slipper pads in contact with the swashplate. A spherical pressure member which externally engages a corresponding central bore of the retainer ring is internally slidably mounted on a cylindrical portion of an annular pusher having a flange portion which is in turn slidably mounted on the shaft. Between the spherical pressure member and the pusher is disposed a first spring while a second spring is disposed between the pusher and the cylinder barrel. As inclination angles below a predetermined valve of the swashplate, the retainer ring is urged toward the swashplate through engagement of the flange of the annular pusher with the spherical pressure member under the force of the second spring. At an inclination angles above the predetermined valve, the retainer ring is urged through engagement of the flange of the pusher therewith at a point.
Inventors
- 👤 Kuniyasu Nagatomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:46
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/124; F04B1/126; F01; F01B; F01B3/00; F01B3/0082; F01B3/0085; F01B3/0088
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
216 words
A device for supporting the retainer ring of an axial piston pump or motor having a plurality of pistons slidably fitted in cylinders formed in a cylinder barrel fixedly mounted on a shaft, slipper pads engaged with the outer ends of the pistons, and a retainer ring for keeping the slipper pads in sliding contact with a swashplate disposed at a desired inclination angle with respect to the axis of the shaft, said pistons being adapted to reciprocate sequentially within the associated cylinders in the direction parallel to the axis of the shaft with rotation of the cylinder barrel, comprising an annular pusher axially slidably fitted on the shaft and pressed toward the swashplate by means of at least one elastic member, and a spherical pressure member axially slidably fitted on the pusher and engaged in a spherical seat in the center of the retainer ring by means of an auxiliary elastic member disposed between the spherical pressure member and the pusher, in such a manner that, when the angle of inclination of the swashplate has exceeded a certain value, the retainer ring comes into contact with the peripheral edges of the pusher at a point away from the center of rotation of the ring toward the slide where the pistons reach their top dead points.
Claim 2
Independent Claim
216 words
A device for supporting the retainer ring of an axial piston pump or motor having a plurality of pistons slidably fitted in cylinders formed in a cylinder barrel fixedly mounted on a shaft, slipper pads engaged with the outer ends of the pistons, and a retainer ring for keeping the slipper pads in sliding contact with a swashplate disposed at a desired inclination angle with respect to the axis of the shaft, said pistons being adapted to reciprocate sequentially within the associated cylinders in the direction parallel to the axis of the shaft with rotation of the cylinder barrel, comprising an annular pusher axially slidably fitted on the shaft and pressed toward the swashplate by means of at least one elastic member, and a spherical pressure member axially slidably fitted on the pusher and engaged in a spherical seat in the center of the retainer ring by means of an auxiliary elastic member disposed between the spherical pressure member and the pusher, in such a manner that, when the angle of inclination of the swashplate has exceeded a certain value, the retainer ring comes into contact with the peripheral edges of the pusher at a point away from the center of rotation of the ring toward the slide where the pistons reach their top dead points.
Claim 3
Dependent Claim
212 words
A fluid-operated pump or motor device, comprising a rotatable shaft, a cylinder barrel affixed to said shaft for rotation therewith, a swashplate mounted adjacent said cylinder barrel for positioning at a desired operationable angle in respect to the axis of said shaft, said cylinder barrel having a plurality of angularly spaced fluid-handling cylinders and a piston movable in each cylinder, slipper pad means engaged with the outer ends of each piston and bearing against said swashplate, a retainer ring carrying said slipper pad means and having a central at least partially spherical sprocket, a pusher axially movable on said shaft, a pressure member movable axially on saId pusher and having at least a partially spherical exterior surface arranged around said shaft engaged in said socket of said retainer ring to permit tilting of said retainer ring on said pressure member, first spring means between said pusher and said pressure member urging said pressure member in a direction toward said retainer ring and said swashplate and second spring means between said cylinder barrel and said pusher urging said pusher toward said pressure member, said first and second spring means being sized and arranged so that they become selectively effective in accordance with the angle of said retainer ring in respect to said shaft.
Claim 4
Dependent Claim
212 words
A fluid-operated pump or motor device, comprising a rotatable shaft, a cylinder barrel affixed to said shaft for rotation therewith, a swashplate mounted adjacent said cylinder barrel for positioning at a desired operationable angle in respect to the axis of said shaft, said cylinder barrel having a plurality of angularly spaced fluid-handling cylinders and a piston movable in each cylinder, slipper pad means engaged with the outer ends of each piston and bearing against said swashplate, a retainer ring carrying said slipper pad means and having a central at least partially spherical sprocket, a pusher axially movable on said shaft, a pressure member movable axially on saId pusher and having at least a partially spherical exterior surface arranged around said shaft engaged in said socket of said retainer ring to permit tilting of said retainer ring on said pressure member, first spring means between said pusher and said pressure member urging said pressure member in a direction toward said retainer ring and said swashplate and second spring means between said cylinder barrel and said pusher urging said pusher toward said pressure member, said first and second spring means being sized and arranged so that they become selectively effective in accordance with the angle of said retainer ring in respect to said shaft.
Claim 5
Dependent Claim
79 words
A fluid-operated pump or motor device according to claim 2, wherein there are 9 of said cylinders distributed around said cylinder barrel and wherein said second spring means includes an axially movable plunger member, said cylinder barrel having a plurality of plunger bores arranged in equally spaced relationship around said barrel, and one of said plunger members being movable in said bores, and a compression spring for each plunger member urging said plunger member toward engagement with said pusher.
Claim 6
Dependent Claim
32 words
A fluid-operated pump or motor device according to claim 3, wherein there are 3 plunger members arranged in equally angularly spaced relationship in said cylinder barrel between said cylinders and said shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |