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. 15, 1991
Filed:
Dec. 18, 1989
Shiro Sakakibara, Aichi, JP;
Masahiro Hasebe, Aichi, JP;
Masashi Hattori, Aichi, JP;
Akihiro Kuroyanagi, Aichi, JP;
Aisin AW Kabushiki Kaisha, , JP;
Abstract
A continuously variable speed transmission having a belt drive continuously variable speed transmission in which a belt is wrapped around primary and secondary pulleys each supported on a shaft and each consisting of a pair of sheaves capable of relatively moving axially, and a forward/reverse rotation changeover mechanism. The belt drive continuously variable speed transmission is provided with a pressure adjusting cam mechanism for applying an axial force corresponding to a transmitted torque to at least one of the pulleys, ball screw mechanisms for axially moving the movable sheaves of the pulleys. A fluid torque converter is disposed on the transmission upstream side of the primary pulley. In the belt drive continuously variable speed transmission, the pressure adjusting cam mechanism produces and axial force corresponding to the transmitted torque to clamp the belt, and the power is transmitted by the effect of this clamping force without belt slip. If at the time of vehicle starting the torque of the fluid torque converter is increased, the pressure adjusting cam mechanism produces a larger axial force corresponding to the increased torque, thereby clamping the belt by a larger force to prevent the belt from slipping during transmission of power. This large belt clamping force is produced for only a short time for vehicle starting. As the torque of the fluid torque converter is reduced to a coupling range, the axial force produced by the pressure adjusting cam mechanism is correspondingly reduced automatically. The belt is clamped by a reduced axial force for a greater part of the operating time.