Patent US3690789A successfully refreshed from Google Patents.
US3690789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic apparatus
Assignee: Dowty Technical Developments Ltd
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Filing: 1970-05-01
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Granted: 1972-09-12
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Expires: 1990-05-01
Abstract
Abstract A swash plate pump or motor comprising a rotary cylinder block having cylinders either parallel to or inclined to the rotation axis, a valve on which the block is arranged to rotate, an inclined or inclinable swash plate located adjacent to one end of the cylinder block engageable by cylinders either directly or through the medium of slippers whereby the pistons are reciprocated as the block rotates, a casing enclosing the valve cylinder block and swash plate, the end portion of the cylinder block adjacent to the swash plate having a cylindrical journal bearing surface engaging within a complementary cylindrical bearing surface within the casing to divide the casing into two chambers and passages extending through the cylinder block in close proximity to the cylindrical bearing surfaces and connecting the two chambers for the flow of liquid therethrough during operation of the pump or motor.
Inventors
- 👤 Peter Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:22
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0055; F01B3/0052; F01B3/0064; F01B3/0067; F04; F04B; F04B23/00; F04B23/04; F04B23/08; F04B23/10; F04B23/106
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A swash plate device comprising a rotary cylinder block having cylinders disposed parallel to or inclined to the rotation axis, valve means cooperating with the cylinder block during rotation to connect the cylinders to the fixed high pressure port cyclically during rotation of the cylinder block, a swash plate adjacent one end of the cylinder block, pistons in the cylinders cooperating with the swash plate whereby the pistons will reciprocate during cylinder block rotation, a casing enclosing the cylinder block and swash plate, the end portion of the cylinder block adjacent to the swash plate having a cylindrical journal bearing surface engaging within a complementary cylindrical bearing surface within the casing to divide the casing into two chambers, and passages extending through the cylinder block in close proximity to the cylindrical bearing surfaces whereby the flow of liquid through said passages cools said surfaces, said passages connecting the two chambers for the flow of liquid therethrough during operation of the device.
Claim 2
Dependent Claim
161 words
A swash plate device comprising a rotary cylinder block having cylinders disposed parallel to or inclined to the rotation axis, valve means cooperating with the cylinder block during rotation to connect the cylinders to the fixed high pressure port cyclically during rotation of the cylinder block, a swash plate adjacent one end of the cylinder block, pistons in the cylinders cooperating with the swash plate whereby the pistons will reciprocate during cylinder block rotation, a casing enclosing the cylinder block and swash plate, the end portion of the cylinder block adjacent to the swash plate having a cylindrical journal bearing surface engaging within a complementary cylindrical bearing surface within the casing to divide the casing into two chambers, and passages extending through the cylinder block in close proximity to the cylindrical bearing surfaces whereby the flow of liquid through said passages cools said surfaces, said passages connecting the two chambers for the flow of liquid therethrough during operation of the device.
Claim 3
Dependent Claim
83 words
A swash plate device as claimed in claim 1 including a liquid inlet connection into the chamber enclosing the swash plate, a fixed low pressure port within the valve means for connection cyclically to tHe cylinders during rotation of the cylinder block and a liquid flow connection from the chamber located between the cylindrical bearing surfaces and the valve means and the said fixed low pressure port whereby liquid flowing through the chambers and the passages may enter the said low pressure port.
Claim 4
Dependent Claim
27 words
A swash plate device as claimed in claim 2 wherein the said passages are arranged to provide a hydrokinetic pumping effect between one chamber and the other.
Claim 5
Dependent Claim
30 words
A swash plate device as claimed in claim 3 wherein a substantial part of each passage in the cylinder block extends parallel to the rotation axis of the cylinder block.
Claim 6
Dependent Claim
35 words
A swash plate device as claimed in claim 4 wherein the number of passages is equal to the number of cylinders in the block and a passage is located between each adjacent pair of cylinders.
References Cited (Backward Citations)
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |