The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2002
Filed:
Sep. 08, 2000
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
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 first speed clutch has been engaged by supplying hydraulic fluid to a fire 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.