US3733970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial piston machine with adjustable swash plate
Assignee: Robert Bosch GmbH
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Filing: 1971-07-20
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Granted: 1973-05-22
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Expires: 1991-07-20
Abstract
Abstract An axial piston machine wherein the swash plate is held against rotation with the cylinder block and is tiltable to both sides of its neutral position by a mechanical, fluid-operated, electrical or electronic system. The swash plate is always tilted about an axis which intersects the axis of that piston in the cylinder block which is nearest to the valve plate to thus maintain the volumes of liquid-filled spaces between the pistons in their foremost positions and the valve plate at a minimum.
Inventors
- 👤 P Bosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:00
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/06; F01; F01B; F01B3/00; F01B3/10; F01B3/103; F01B3/106; F04B49/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
254 words
In an axial piston machine, a combination comprising a cylinder block rotatable about a predetermined axis and having a plurality of axially parallel open-ended bores; a valve plate adjacent to said block to seal the open ends of said bores; pistons reciprocably received in said bores; a swash plate tiltable with reference to said axis to both sides of a neutral position to thereby change the extent of movement of said pistons with reference to said block in a direction away from said valve plate and to maintain said pistons at a predetermined minimum distance from said valve plate in said neutral position thereof, one of said pistons being located at such minimum distance from said valve plate whenever said swash plate is tilted from said neutral position thereof; means for holding said swash plate against rotation with said cylinder block; and adjusting means for changing the inclination of said swash plate with reference to said axis, comprising a pair of movable tilting members operatively connected with said swash plate at points located diametrically opposite each other with reference to said axis, and means for moving at least one of said tilting members to thereby tilt said swash plate about a second axis which intersects the axis of said one piston to thus insure that the axial position of said one piston remains unchanged in spite of the tilting of said swash plate. 2. A combination as defined in claim 1, wherein said tilting members are movable in substantial parallelism with said predetermined axis.
Claim 2
Dependent Claim
21 words
A combination as defined in claim 2, wherein said means for moving said tilting members comprises a pair of differential pistons.
Claim 3
Dependent Claim
30 words
A combination as defined in claim 3, wherein said differential pistons are connected with said tilting members and said adjusting means further comprises control means for moving said differential pistons.
Claim 4
Dependent Claim
36 words
A combination as defined in claim 4, wherein said control means comprises a pair of movable cams and connecting means for synchronizing the movements of said cams, said differential pistons having follower means tracking said cams.
Claim 5
Dependent Claim
27 words
A combination as defined in claim 4, wherein said control means comprises a pair of control pistons which are axially movable with reference to said differential pistons.
Claim 6
Dependent Claim
47 words
A combination as defined in claim 4, further comprising means defining for said differential pistons cylinder chambers, said differential pistons being movable axially by a pressurized fluid and said control means comprising rotary valve members arranged to control the flow of fluid into and from said chambers.
Claim 7
Dependent Claim
45 words
A combination as defined in claim 7, wherein said valve members have peripheral fluid flow controlling grooves and are rotatable with reference to said differential pistons, said adjusting means further comprising connecting means coupling said valve members for angular movements in synchronism with each other.
Claim 8
Dependent Claim
51 words
A combination as defined in claim 1, wherein said tilting members have threaded portions and said means for moving said tilting members comprises complementary threaded elements meshing with said threaded portions and means for rotating said complementary elements to thereby move said tilting members in substantial parallelism with said predetermined axis.
Claim 9
Dependent Claim
18 words
A combination as defined in claim 9, wherein said means for rotating said complementary elements comprises electric motors.
Claim 10
Dependent Claim
33 words
A combination as defined in claim 10, wherein said portions of said tilting members are provided with external threads And said complementary elements constitute internally threaded nuts meshing with said externally threaded portions.
Claim 11
Dependent Claim
44 words
A combination as defined in claim 1, wherein said adjusting means further comprises signal generating detector means for scanning the position of said swash plate and for effecting the termination of movement of said tilting members when said swash plate assumes a preselected position.
Claim 12
Dependent Claim
25 words
A combination as defined in claim 12, wherein said means for moving said tilting members comprises an electronic circuit receiving signals from said detector means.
Claim 13
Dependent Claim
62 words
A combination as defined in claim 13, wherein said means for moving said tilting members further comprises means defining a pair of cylinder chambers, electromagnetic valve means for regulating the flow of a pressurized fluid into and from said chambers in response to signals from said control circuit, and differential pistons reciprocably received in said chambers and connected with said tilting members.
Claim 14
Dependent Claim
28 words
A combination as defined in claim 13, wherein said control circuit further comprises an input for signals indicating the desired extent of angular displacement of said swash plate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |