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:
Feb. 22, 1991
Tomoo Sawasaki, Hiroshima, JP;
Chitoshi Morishige, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A steplessly variable power transmission has a torque converter provided with an input member connected with an engine output member of an engine and an output member. A belt-pulley type of steplessly variable power transmitting mechanism is provided with primary pulley device, connected with the output member of the torque converter. A secondary pulley device, constituting an output member of the transmission, is also provided and a belt connects the primary pulley devices with the secondary pulley device for transmitting power between the primary and secondary pulley device with a predetermined pulley speed ratio. A hydraulic control system controls effetive diameters of the primary and secondary pulley devices to thereby change the speed ratio of the transmission steplessly. An output torque of the torque converter or a turbine torque of the torque converter, and the pulley speed ratio are calculated. A line pressure of the hydraulic control system is controlled in accordance with signals representing the output or turbine torque and pulley speed ratio to control the effective diameter so that a slippage of the belt can be effectively prevented.