Variable displacement radial piston pumps or motors

Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Motive fluid bypass to or from assembly

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Details

91494, 91497, 91498, 92 121, 417221, F01B 106

Patent

active

047778660

ABSTRACT:
This invention relates to a radial piston device with a rotatable casing useful as a pump or a motor. The device is highly efficient with an overall efficiency of 0.95 and a mechanical efficiency of 0.97, a wide rotational speed range of over 1000 rpm, and can be made with continuously variable or fixed displacement. The device is compact in size, light in weight and simple in structure making it easy to manufacture. Moreover, the device can be constructed from a variety of materials without restrictive material requirements, can operate with both filtered and non-filtered oil, and is not sensitive to environmental effects. When the device is mounted on a wheel to form a hydrostatic transmission system, the layout and performance of the vehicle are significantly improved. The displacement control means provided by the present invention is also applicable to other motors or pumps with eccentric shafts. This invention also provides a simple and reliable flat oil seal.

REFERENCES:
patent: 1906787 (1933-05-01), Cuttat
patent: 2473271 (1949-06-01), Benedek
patent: 2679210 (1954-05-01), Muller
patent: 3131604 (1964-05-01), Orshansky, Jr.
patent: 3511131 (1970-05-01), Kress
patent: 3610384 (1971-10-01), Borck
patent: 3771423 (1973-11-01), Culberson
patent: 3777624 (1973-12-01), Dixon
patent: 3943826 (1976-03-01), Kita
patent: 4362480 (1982-12-01), Suzuki et al.
patent: 4478132 (1984-10-01), Braddock
patent: 4503754 (1985-03-01), Irwin
patent: 4635535 (1987-01-01), Thoma et al.
Design and Development of a Low Speed High Torque Hydraulic Motor by R. J. Recker (Society of Automotive Engineers, Inc., Publication No. 810974, copyright 1/1981).
Wheel Motors for Hydrostatic Mobile Equipment by Siegfried Nembach Zahnradfabrik Friedrichshafen AG (Society of Automotive Engineers, Inc., Publication No. 810971, copyright 1/1981).
Hydrostatic Assisting Drive by Claude Pinson (Society of Automotive Engineers, Inc., Publication No. 780756), 1/1981.

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