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. 27, 1990
Filed:
Oct. 31, 1988
Akihiro Ueki, Zama, JP;
Kazuhiko Sugano, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A second spool valve element which is engageable with the one which actually controls discharging of hydraulic fluid in a manner which controls the level of the line pressure, has first and second lands, the first and second lands defining a pressure differential area which can be exposed to a first control pressure indicative of the transmission being shifted out of D range into a lower one, in a manner to bias the second valve toward the first spool valve element; a chamber is defined in the valve bore to which the engageable ends of the first and second spools are exposed and which is supplied with a second control pressure indicative of the torque being applied to the tranmission, the second control pressure producing a bias which tends to move the the first and second spool valve elements apart.