Charge pump for a hydrostatic transmission

Details Charge pump for a hydrostatic transmission Charge pump for a hydrostatic transmission

1997-06-02

1999-09-28

Richter, Sheldon J.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60488, 91441, F16D 3102

Patent

active

059569522

ABSTRACT:
A charge pump for a hydrostatic transmission, having a self-charge relief function, in which a first toothed wheel, a second toothed wheel, and a pump casing, housing therein the first and second toothed wheels, are molded of heat resistant resin material, thereby reducing the weight of the charge pump, stabilizing its charge relief function and reducing the wear of the lower surface of a center section. Check valves are housed in the pump casing so that operating oil sealed between a hydraulic pump and a hydraulic motor can always be maintained at a proper level, regardless of whether the charge pump is driven or not.

REFERENCES:
patent: 4891944 (1990-01-01), Okuda et al.
patent: 5031403 (1991-07-01), Okada
patent: 5311740 (1994-05-01), Shiba et al.
patent: 5412948 (1995-05-01), Komura et al.
patent: 5546752 (1996-08-01), Horton et al.
patent: 5613409 (1997-03-01), Hauser
patent: 5701739 (1997-12-01), Ohashi et al.

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