VEHICULAR AUTOMATIC TRANSMISSION

Japanese Patent JP3523124

B2

PROBLEM TO BE SOLVED: To smoothly determine first speed hold transmission stage and especially improve responsiveness of disengagement of a first speed clutch under a low temperature, in an automatic transmission which has both first speed clutch and first speed hold clutch.
SOLUTION: A first speed clutch C1 and a first speed hold clutch CLH are arranged in parallel. A second clutch piston 44 to be engaged with the first speed hold clutch CLH is housed inside a first clutch piston 43 to be engaged with the first speed clutch C1 in a relatively movable manner. A check valve 48 is arranged on the first clutch piston 43. When a first speed hold transmission stage is determined, operation oil is supplied to a first clutch oil chamber 46 and the first speed clutch C1 is engaged. Afterward, operation oil is also supplied to a second clutch oil chamber 55, and the first speed hold clutch CLH is engaged. Oil discharging ports 53, 54 are formed on a clutch outer 31. The operation oil, flowed out from the check valve which is opened at the time of disengaging of the first speed clutch C1, is speedily discharged.

JPH0647137	[Name of invention] Bulldozer steering clutch structure
JP2571587	[Name of invention] Clutch device

Tanizawa, Shoichi
Hattori, Takafumi
Takashima, Taro

JP25683499A

April 26, 2004

September 10, 1999

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HONDA MOTOR CO LTD

F16D13/60; F16D25/0638; F16H61/00; F16H61/04; F16H61/08; F16H3/083; F16H63/30; F16H61/684; (IPC1-7): F16H61/08; F16D13/60; F16D25/0638; F16H3/083

落合 健 （外１名）

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