Hydrostatic continuously variable transmission

Details Hydrostatic continuously variable transmission Hydrostatic continuously variable transmission

1993-09-14

1995-05-09

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

137517, 137504, 1375395, 60489, F16D 3102

Patent

active

054129486

ABSTRACT:
A ball and piston valve for controlling the flow of hydraulic fluid to a motive means have the ball and piston spring biased in opposing directions and with both initially subject to a first hydraulic fluid pressure that allows the springs to cause the ball to be unseated from its seat whereby fluid is directed to a fluid tank and wherein the ball is of sufficiently larger diameter than the piston that upon an increase in fluid pressure the ball is seated and remains seated when the pressure drops to the first hydraulic fluid pressure whereby the motive means to which the fluid is directed when the ball is seated does not have a sudden lurch upon a subsequent increase in pressure.

REFERENCES:
patent: 3522999 (1970-08-01), Liles
patent: 4349043 (1982-09-01), Christensen
patent: 4589393 (1986-05-01), Jourde et al.
patent: 4704097 (1980-07-01), Dittrich
patent: 4765228 (1988-08-01), Wagenseil
patent: 4942786 (1987-11-01), Sakai
patent: 4973288 (1990-11-01), Sakakibara et al.
patent: 5125291 (1992-06-01), Makita et al.

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