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:
Oct. 09, 2001
Filed:
Mar. 02, 2000
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A vehicle automatic transmission selectively establishes a plurality of shift ranges through a simultaneous engagement of the two hydraulic coupling elements C,, C,of the first group and a simultaneous engagement of either one of the two hydraulic coupling elements of the first group and any one of the two or more hydraulic coupling elements C,, B,, B,of the second group. A fail-safe valve,is interposed between an oil passage L,communicating with the shift control valves,other than the shift control valves,corresponding to the hydraulic coupling elements C,, C,that are being intended to establish a predetermined single shift range and an oil supply passage L,. A resultant signal valve is provided that is adapted to output a signal pressure when hydraulic pressures of the two hydraulic coupling elements C,, C,of the first group are inputted into the resultant signal valve to be found that the hydraulic pressures of the two hydraulic coupling elements C,, C,increase. The fail-safe valve,is constructed so as to be switched over to the closed position when hydraulic pressures of the respective hydraulic coupling elements C,, B,, B,of the second group and the signal pressure are inputted into the fail-safe valve,to be found that any two or more of the hydraulic pressures and signal pressure increase at the same time.