Forward/backward switching control apparatus for hydraulic...

Details Forward/backward switching control apparatus for hydraulic... Forward/backward switching control apparatus for hydraulic...

2005-07-12

2005-07-12

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Having apparatus control by timer or delay means

C060S399000, C060S423000, C060S465000, C060S490000

Reexamination Certificate

active

06915631

ABSTRACT:
A forward/backward switching control apparatus for a hydraulic drive vehicle that includes the following structures. A variable displacement type hydraulic pump driven by an engine for discharging pressure oil in both directions. An electromagnetic pump inclination angle control mechanism making the discharge displacement of the variable displacement type hydraulic pump variable and for causing the same to discharge in both directions. An electric control outputting signals to run the hydraulic drive vehicle forward, backward and forward/backward. A control device outputting, when the electric control is switched forward/backward to output the forward/backward signal and when the time for switching the forward/backward signal is not longer than a preset time, a first modulate signal for delaying the return times from the forward position to the neutral position and from the backward position to the neutral position to the electromagnetic pump inclination angle control mechanism.

REFERENCES:
patent: 4075841 (1978-02-01), Hamma et al.
patent: 4188789 (1980-02-01), Hamma
patent: 4355509 (1982-10-01), Fulkerson et al.
patent: 5184466 (1993-02-01), Schniederjan et al.
patent: 6385970 (2002-05-01), Kuras et al.
patent: 11182674 (1999-06-01), None

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