Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1989-12-26
1992-02-25
Diehl, Dwight
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
74606R, F16H 5702
Patent
active
050909509
ABSTRACT:
An automatic power transmission includes a primary transmission unit having plurality of gear elements for establishing predetermined speed ratios and a subsidiary transmission unit having an under-drive gear element for establishing at least one and a direct drive. Each gear element is associated with a friction element which controls associated one of the gear element for establishing one of a plurality of predetermined speed ratios. The friction element is connected to a hydraulic circuit which controls position of the friction element between engaged position and released position for establishing the one of speed ratios. The hydraulic circuit comprises a primary hydraulic unit mounted on a primary transmission casing and housing a plurality of control valves for variation pressure supply for respective friction elements, the primary hydraulic unit, and a subsidiary hydraulic unit mounted on a subsidiary transmission casing and including a pressure accumulator, a flow restriction orifice and an one-way check valve.
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Hattori Noboru
Iwanaga Kazuyoshi
Sugano Taku
Diehl Dwight
Jatco Corporation
Kananen Ronald P.
Nissan Motor Company Ltd.
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