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. 17, 2007
Filed:
Jun. 12, 2003
Masatoshi Fukuyama, Nagoya, JP;
Toshifumi Hibi, Kanagawa, JP;
Jun Sugihara, Kanagawa, JP;
Toshikazu Oshidari, Kanagawa, JP;
Masatoshi Fukuyama, Nagoya, JP;
Toshifumi Hibi, Kanagawa, JP;
Jun Sugihara, Kanagawa, JP;
Toshikazu Oshidari, Kanagawa, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Jatco Ltd, Fuji-shi, JP;
Abstract
When, with engine kept stopped, driven road wheels are turned, the toroidal type continuously variable transmission is suppressed from shifting toward a higher speed side. That is, when, with the engine kept stopped, the road wheels are turned in a reverse direction due to a traction of a motor vehicle with its front end facing backward, an extra oil pump driven by the road wheels produces an oil pressure which is applied to a hydraulic servo mechanism to keep a speed change ratio at a lower speed side. While, when, with the engine kept stopped, the road wheels are turned in a forward direction due to a traction of the motor vehicle with its front end facing forward, the oil pressure produced by the extra oil pump is not practically used. Under this condition, a biasing spring suppresses a servo piston from moving in a direction to bring about a speed change ratio for the higher speed side.