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. 08, 1986
Filed:
Feb. 15, 1984
Kazuyoshi Iwanaga, Atsugi, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In order to ensure that an adequately high gear ratio (such as top gear) is engaged momentarily before the first gear ratio and thus reduce select shock when a manual selector valve is moved from neutral (N) to drive (D), while simultaneously enabling the provision of a flow restriction required to ensure smooth automatic upshifting into the high gear in question, a control valve is provided which, in response to the engine associated with the transmission being sensed in an idling condition and the manual selector valve being moved from (N) to (D), boosts the governor pressure up to line pressure level and therefore induces the shift valves of the transmission to assume their respective upshift positions. Further, a valve which by-passes the flow restriction is provided. This 'by-pass' valve assumes a position wherein it by-passes the flow restriction and unrestrictedly supplies the shift valve which controls the friction elements which produce the high gear ratio, with line pressure for a brief period prior the pressure fed to the friction units utilized to produce the second speed ratio biasing the by-pass valve to a position wherein the flow restriction is no longer by-passed and thus effective for shift shock suppression.