Vehicle automatic transmission

Details Vehicle automatic transmission Vehicle automatic transmission

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 61/28 (2006.01) F16H 61/04 (2006.01) F16H 63/30 (2006.01) F16H 61/684 (2006.01)

Patent

CA 2317905

An automatic transmission includes a first speed clutch and a first speed hold clutch side by side, and a first speed hold gear shift stage is smoothly established and the responsiveness of disengagement of the first speed clutch is enhanced, particularly at low temperatures. The first speed clutch and the first speed hold clutch are provided side by side, a second clutch piston for engaging the first speed hold clutch, is installed in a relatively movable manner inside a first clutch piston for engaging the first speed clutch, and a check valve is provided on the first clutch piston. When a first speed hold gear shift stage is established, after the first speed clutch has been engaged by supplying hydraulic fluid to a first clutch oil chamber, the first speed hold clutch is engaged by supplying hydraulic fluid to a second clutch oil chamber. Oil outlets are formed in a clutch housing and the hydraulic oil which discharges from the opened check valve when the first speed clutch is disengaged is rapidly discharged outside the clutch outer.

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