Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1982-12-01
1985-02-26
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74867, 74869, B60K 4106
Patent
active
045011737
ABSTRACT:
A control device for effecting variable hydraulic fluid delivery to a gearshift element of an automatic transmission and controlling actuation of the gearshift element. Such a control device includes a delivery line for supplying a pressurized fluid to the gearshift element, a throttle in the delivery line, a bypass line for bypassing the throttle and supplying the pressurized fluid to the gearshift element, and a valve arranged in the bypass line that has a piston that is moveable between an open position, which permits flow through the bypass line, and a closed position, which prevents flow. Pressure downstream of the throttle acts on the valve and urges the piston into the open position; a vehicle speed-dependent pressure acts on the valve and urges the piston into the closed position. The piston can be biased, for example, with a spring, such that the piston remains in the open position up to a predetermined vehicle speed. The vehicle speed-dependent pressure can act on an end face of the piston that has two surfaces, which are arranged in step form; this pressure acts on only one surface when the piston is in the open position and acts on both surfaces when the piston is in the closed position.
REFERENCES:
patent: 3800627 (1974-04-01), Oberpichler
patent: 3902380 (1975-09-01), Murakami
patent: 3949627 (1976-04-01), Murakami
patent: 4020718 (1977-05-01), Miyauchi et al.
patent: 4046033 (1977-09-01), Hashimoto et al.
patent: 4253553 (1981-03-01), Yamada et al.
patent: 4291596 (1981-09-01), Sakakibara
patent: 4296652 (1981-10-01), Oberpichler et al.
patent: 4331045 (1982-05-01), Diech et al.
Braun Leslie A.
Quiray Arthur T.
Volkswagenwerk Aktiengesellschaft
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