US3643550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
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Filing: 1970-02-16
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Granted: 1972-02-22
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Expires: 1990-02-16
Abstract
Abstract A variable displacement piston pump or motor unit has an oscillatable yoke controlled by double-acting preloaded spring centering mechanism. Abutments are provided in the casing and on the yoke between which a tool may be wedged to hold the yoke in neutral position while the centering springs are being adjusted. The housing has openings providing access for the tool, which openings may also serve as fluid connections.
Inventors
- 👤 Robert J Lease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:49
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/10; F01B3/103; F01B3/106
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
In an axial piston pump or motor unit having a cylinder barrel rotatable relative to a stationary commutating valve plate, a drive shaft in line with and drivingly connected to the cylinder barrel, a set of pistons reciprocable relative to the cylinder barrel, a tiltable swashplate yoke for causing reciprocation of the pistons through strokes of adjustable length, the combination therewith of a housing enclosure formed with journals for the shaft and journals for the yoke on an axis intersecting the shaft axis perpendicularly, at least one access hole in the housing spaced from the shaft and Yoke journal axes, fixed abutment means on the yoke presenting an alignment face in predetermined relation to the swashplate plane and further abutment means on the housing in predetermined relation to the valve plate plane, both said alignment faces being accessible to a tool inserted through the access hole.
Claim 2
Dependent Claim
146 words
In an axial piston pump or motor unit having a cylinder barrel rotatable relative to a stationary commutating valve plate, a drive shaft in line with and drivingly connected to the cylinder barrel, a set of pistons reciprocable relative to the cylinder barrel, a tiltable swashplate yoke for causing reciprocation of the pistons through strokes of adjustable length, the combination therewith of a housing enclosure formed with journals for the shaft and journals for the yoke on an axis intersecting the shaft axis perpendicularly, at least one access hole in the housing spaced from the shaft and Yoke journal axes, fixed abutment means on the yoke presenting an alignment face in predetermined relation to the swashplate plane and further abutment means on the housing in predetermined relation to the valve plate plane, both said alignment faces being accessible to a tool inserted through the access hole.
Claim 3
Dependent Claim
46 words
A unit as defined in claim 1 wherein a tool comprising a bar having camming surfaces is positioned between the alignment faces of the yoke to cam and hold the yoke with the swashplate parallel to the valve plate while the centering device is being adjusted.
Claim 4
Dependent Claim
51 words
A unit as defined in claim 1 wherein a tool comprising a straight bar of square cross section is positioned between the alignment faces, the side dimensions of the square being less than the spacing of the faces when parallel and the diagonal of the square being greater than that spacing.
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 |