US3693508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
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Filing: 1970-12-28
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Granted: 1972-09-26
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Expires: 1990-12-28
Abstract
Abstract A hydraulic pump or motor of the axial piston type having a cylinder barrel rotating against a fixed valve plate perpendicular to the shaft and free to find its own seat against the valve plate has an improved casing which restricts circulation of liquid tending to be carried around with the rotating cylinder barrel. This reduces the magnitude of the fluid pressure forces exerted on the cylinder barrel by the circulating fluid and which tend to tip the cylinder barrel away from full contact with the valve plate which consequently increases the maximum speed at which the unit can operate.
Inventors
- 👤 Edward J Chondzinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:48
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0064; F01B3/0067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
In a hydraulic pump or motor of the type having a swash plate, a revolving cylinder barrel carrying axial pistons which transmit the driving torque as cantilevers and having a drive shaft and a valve plate perpendicular thereto, with the cylinder barrel connected to the shaft with freedom to find its seat against the valve plate, that improvement which includes a casing having a non-concentric inner contour surrounding the cylinder barrel which is shaped to control the circulation of fluid carried around by the drag of the cylinder barrel for preventing the generation of laterally unbalanced pressure forces on the cylinder barrel.
Claim 2
Dependent Claim
102 words
In a hydraulic pump or motor of the type having a swash plate, a revolving cylinder barrel carrying axial pistons which transmit the driving torque as cantilevers and having a drive shaft and a valve plate perpendicular thereto, with the cylinder barrel connected to the shaft with freedom to find its seat against the valve plate, that improvement which includes a casing having a non-concentric inner contour surrounding the cylinder barrel which is shaped to control the circulation of fluid carried around by the drag of the cylinder barrel for preventing the generation of laterally unbalanced pressure forces on the cylinder barrel.
Claim 3
Dependent Claim
34 words
A pump or motor unit as defined in claim 1 wherein the shaped inner contour includes a plurality of flow restricting means for liquid which would otherwise tend to circulate with the cylinder barrel.
Claim 4
Dependent Claim
91 words
In a hydraulic pump or motor of the type having a swash plate, a revolving cylinder barrel carrying axial pistons which transmit the driving torque as cantilevers and having a drive shaft and a valve plate perpendicular thereto, with the cylinder barrel connected to the shaft with freedom to find its seat adjacent the valve plate, that improvement which includes a casing having an internal configuration adjacent the cylinder barrel which is baffled to interrupt the circulation of fluid around the cylinder barrel between the valve plate and the swash plate.
Claim 5
Dependent Claim
91 words
In a hydraulic pump or motor of the type having a swash plate, a revolving cylinder barrel carrying axial pistons which transmit the driving torque as cantilevers and having a drive shaft and a valve plate perpendicular thereto, with the cylinder barrel connected to the shaft with freedom to find its seat adjacent the valve plate, that improvement which includes a casing having an internal configuration adjacent the cylinder barrel which is baffled to interrupt the circulation of fluid around the cylinder barrel between the valve plate and the swash plate.
Claim 6
Dependent Claim
30 words
A pump or motor as defined in claim 3 wherein two baffles are provided which project inwardly to occupy most of the clearance between the cylinder barrel and the casing.
Claim 7
Dependent Claim
29 words
A pump or motor unit as defined in claim 4 wherein the baffles are located in a plane occupied by the pistons at the mid point of their stroke.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |