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. 13, 1987
Filed:
May. 12, 1986
Shoji Yokoyama, Aichi, JP;
Aisin-Warner K.K., Anjo, JP;
Abstract
A reduction ratio controlling mechanism provided within the hydraulic control system of a continuously variable automatic transmission of a vehicle including a V-belt type continuously variable transmission which comprises an input pulley and an output pulley, the effective diameter of each of said pulleys being variable by means of a corresponding hydraulic servomechanism, and a V-belt extending between said input and said output pulleys, for changing the reduction ratio of said continuously variable transmission by supplying a hydraulic fluid to and by draining same from the hydraulic servomechanism of said input pulley. The reduction ratio controlling mechanism comprises an electromagnetic up-shift valve and an electromagnetic down-shift valve each capable of producing a solenoid pressure corresponding to the running condition of the vehicle by regulating the line pressure applied thereto, and a reduction ratio control valve having a spool movable under the control of the spring force of a spring provided on one side of the spool and the solenoid pressure applied to the other side of the spool. The spring force of the spring works in the direction of movement of the spool during down-shift operation.