Hydrostatic transmission

Details Hydrostatic transmission Hydrostatic transmission

1990-07-30

1992-03-17

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60487, F16D 3102

Patent

active

050956981

ABSTRACT:
A hydrostatic transmission in a closed circuit which includes a hydraulic engine having a stroke-volume control device and a hydraulic pump connected to said hydraulic engine by two pressure lines. The stroke volume of the pump and/or the engine is regulated by the stroke-volume control device. The closed circuit includes a reversing valve which is connected to both pressure lines and is controlled by the prevailing pressures in the pressure lines. The reversing valve connects the pressure line carrying the lower pressure to a delivery valve and connects the pressure line carrying the higher pressure to a pressure-reducing valve so that the level of the control pressure in the stroke-volume control device is determined. A pressure-reducing valve is located in each pressure line and the pressure-reducing valves and the reversing valve are combined as a single combination valve.

REFERENCES:
patent: 3591965 (1971-07-01), Bobst et al.
patent: 3823558 (1974-07-01), Tittmann et al.
patent: 3846982 (1974-11-01), Rometsch et al.
patent: 4341133 (1982-07-01), Sakamoto
patent: 4498847 (1985-02-01), Akiyama
patent: 4932208 (1990-06-01), Koyama et al.

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