Oil pressure control valve assembly for hydrostatic transmission

Details Oil pressure control valve assembly for hydrostatic transmission Oil pressure control valve assembly for hydrostatic transmission

1993-03-31

1994-08-02

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60488, 137494, 251 50, 251285, F16D 3102, F16K 3112

Patent

active

053334515

ABSTRACT:
In a valve mechanism for controlling oil pressure in an oil path (13) connecting between a hydraulic pump (11) and motor (12) of a hydrostatic transmission (10), a differential piston (23) serving as a relief valve member for gradually increasing the oil pressure has a larger pressure-applied surface area at the side opposite to the oil path than at the side of this path. A throttled oil passage (24) is provided for conducting oil pressure in the path to the larger surface area. The piston is biased by a valve spring (25) through a control piston (26). A receiving member (27) for the spring and a stopper member (28) for the control piston are provided such that they are adjustable in position independently of each other. By this, the manner of increasing the oil pressure may be adjusted in a large variety. The valve mechanism also serves as a relief valve for excluding a possible, excessively high pressure.

REFERENCES:
patent: 1124203 (1915-01-01), Bingley
patent: 3583157 (1971-06-01), Adams et al.
patent: 3735590 (1973-05-01), Bobst
patent: 3770240 (1973-11-01), Mito et al.
patent: 3802460 (1974-04-01), Grosseau
patent: 4209988 (1980-07-01), Langworthy et al.
patent: 4223693 (1980-09-01), Kosarzecki
patent: 4494624 (1985-01-01), Scheuerle et al.
patent: 4520625 (1985-06-01), Sato et al.

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