Title: Automatic transmission hydraulic control throttle valve

Abstract: A valve spool and a piston are disposed substantially parallel to each other and are pivotably connected with a lever which is movable by the accelerator pedal of a prime mover. The force differential biasing the valve spool to withstand the force of the lever tending to move the valve spool is approximately zero. The valve spool has a valve land with a width equal to that of a port connected with a throttle pressure passage, and a constant neutral position in which the valve land registers with the port and hydraulic pressure in the passageway is equal to a throttle pressure depending on the position of the accelerator pedal. The piston is biased by the hydraulic pressure in the passageway and a spring in opposite directions to cause the valve spool to occupy the netural position.

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Inventors: Iijima, Tetsuya (Tokyo, JA)

Application Number: 511689
Filing Date: 1974-10-03
Publication_date: 1976-03-02
Assignee: Nissan Motor Co., Ltd. (Yokohama, JA)
Primary Class(es): 137/102 137/115.16, 137/628, 477/156
Other Classes:
US Patent Ref:

1399774	Dec, 1941	Johnson	137/628.
2655907	Oct, 1953	Downing	137/87.

Other Refs:
Primary Examiner: Schwadron, Martin P.
Assistant Examiner: Miller, Robert J.
Attorney: