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:
Nov. 22, 1994
Filed:
Apr. 19, 1993
Applicant:
Inventors:
Minoru Kuriyama, Hiroshima, JP;
Shinya Kamada, Hiroshima, JP;
Shigeru Nagayama, Hiroshima, JP;
Takayuki Sumimoto, Hiroshima, JP;
Assignee:
Mazda Motor Corporation, Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60K / ; F16D / ;
U.S. Cl.
CPC ...
475129 ; 192 / ; 1921 / ;
Abstract
An automatic transmission has a hydraulic circuit which controls supply of engaging pressures to friction coupling elements. The hydraulic circuit has a first hydraulic passage having a hydraulic pressure control valve including an accumulator, a second hydraulic passage which is provided in parallel to the first hydraulic passage and is provided with an electrically controlled hydraulic pressure control valve, and a shift valve which selectively connects a predetermined friction coupling element to the first hydraulic passage or the second hydraulic passage.