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:
Feb. 25, 1992
Filed:
Dec. 26, 1989
Nissan Motor Company, Ltd., both of, JP;
Jatco Corporation, both of, JP;
Abstract
An automatic power transmission includes a primary transmission unit having plurality of gear elements for establishing predetermined speed ratios and a subsidiary transmission unit having an under-drive gear element for establishing at least one and a direct drive. Each gear element is associated with a friction element which controls associated one of the gear element for establishing one of a plurality of predetermined speed ratios. The friction element is connected to a hydraulic circuit which controls position of the friction element between engaged position and released position for establishing the one of speed ratios. The hydraulic circuit comprises a primary hydraulic unit mounted on a primary transmission casing and housing a plurality of control valves for variation pressure supply for respective friction elements, the primary hydraulic unit, and a subsidiary hydraulic unit mounted on a subsidiary transmission casing and including a pressure accumulator, a flow restriction orifice and an one-way check valve.