US3828400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic motors and the like
Assignee: Chamberlain Industries Ltd
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Filing: 1972-01-27
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Granted: 1974-08-13
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Expires: 1992-01-27
Abstract
Abstract A radial-cylinder hydraulic motor in which a series of reciprocating pistons are arranged around an eccentric mounted on a drive shaft, has a novel eccentric construction, the eccentric comprising an annulus which is driven by the pistons, and opposed piston-and-cylinder devices which are based on said drive shaft carry the annulus towards and away from the axis of the drive shaft to vary the throw of the eccentric and thus the displacement of the motor. The piston-and-cylinder device which moves the annulus away from the shaft axis is preferred to have a larger effective working area than the piston-and-cylinder device which moves the annulus towards the shaft axis.
Inventors
- 👤 B Mason
- 👤 M Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:30
CPC Classifications
F; F03; F03C; F03C1/00; F03C1/02; F03C1/04; F03C1/0447; F03C1/0457; F03C1/046; F04; F04B; F04B49/00; F04B49/12; F04B49/123; F04B49/125; F03C1/053; F03C1/0538; F04B1/00; F04B1/04; F04B1/06; F04B1/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
A radial cylinder hydraulic motor comprising a casing, a drive shaft journalled in said casing; an eccentric within said casing and extending about said drive shaft; a drive from said shaft to said eccentric to drive said eccentric; said drive shaft having oppositely facing cylindrical recesses therein facing said ecentric; said casing having a series of radial cylinders therein opening towards said eccentric and a drive piston in eaCh radial cylinder to rotate said eccentric and thus said shaft, opposed control pistons in said cylindrical recesses having engagement with said eccentric; fluid pressure passageways to said cylindrical recesses; and valve means to admit fluid under pressure to said passageways and cylindrical recesses at variable pressures to vary the throw of said eccentric and thus the displacement of the motor, said control pistons and cylindrical recesses having different diameters, the control piston moving the eccentric towards the shaft axis to decrease the eccentricity being of smaller diameter than the control piston which moves the eccentric away from the shaft axis to increase the throw of the eccentric.
Claim 2
Dependent Claim
176 words
A radial cylinder hydraulic motor comprising a casing, a drive shaft journalled in said casing; an eccentric within said casing and extending about said drive shaft; a drive from said shaft to said eccentric to drive said eccentric; said drive shaft having oppositely facing cylindrical recesses therein facing said ecentric; said casing having a series of radial cylinders therein opening towards said eccentric and a drive piston in eaCh radial cylinder to rotate said eccentric and thus said shaft, opposed control pistons in said cylindrical recesses having engagement with said eccentric; fluid pressure passageways to said cylindrical recesses; and valve means to admit fluid under pressure to said passageways and cylindrical recesses at variable pressures to vary the throw of said eccentric and thus the displacement of the motor, said control pistons and cylindrical recesses having different diameters, the control piston moving the eccentric towards the shaft axis to decrease the eccentricity being of smaller diameter than the control piston which moves the eccentric away from the shaft axis to increase the throw of the eccentric.
Claim 3
Dependent Claim
46 words
The hydraulic motor of claim 1, in which the control pistons are effective to move the eccentric between drive and neutral positions and past a neutral position to a drive position, to enable the motor to reversely operate without altering the direction of supply fluid flow.
Claim 4
Dependent Claim
23 words
The hydraulic motor of claim 1 in which spring means cooperate with the control pistons to move the eccentric to various selected positions.
Claim 5
Dependent Claim
32 words
The hydraulic motor of claim 1 in which the means for driving the eccentric from the shaft comprise parallel plane inner surfaces on said eccentric cooperating with plane surfaces on said shaft.
Claim 6
Dependent Claim
33 words
The hydraulic motor of claim 1, wherein the fluid pressure passageways leading to said control pistons vary the eccentricity of said eccentric, and lead through said shaft and are sealed to said casing.
Claim 7
Dependent Claim
36 words
The hydraulic motor of claim 1, in which said valve means to admit fluid pressure to said passageways comprises a servo-control system providing infinte variation of the throw of said eccentric between zero and a maximum.
Claim 8
Dependent Claim
38 words
The hydraulic motor of claim 6, and further comprising a two-line pressure feed to said radial cylinders, and a shuttle valve selecting the higher pressure of the two-line feed and directing said higher pressure to said servo-control system.
Claim 9
Dependent Claim
23 words
The hydraulic motor of claim 7, in which a springloaded valve in said shaft relieves excess fluid from the pressure within said eccentric.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |