Belt continuously variable transmission

Abstract

The invention discloses a speed ratio control device of a continuously variable transmission. The speed ratio control device comprises a direct-current motor, a controller of the direct-current motor, two groups of gear transmission mechanisms, two groups of spiral lead screw mechanisms, two groups of spring force-assisting mechanisms, a plurality of plane bearings and a plurality of needle bearings. The direct-current motor serves as a power source of the transmission for speed ratio control, motor turning angle is converted to axial displacement of a belt pulley moving disc of the belt continuously variable transmission by controlling motor turning directions and turning angles through the two groups of gear transmission mechanisms and the spiral lead screw mechanisms correspondingly connected with the gear transmission mechanisms under matching of springs, and further continuous change of speed ratio of the continuously variable transmission in different working conditions is achieved by changing the contact radiuses of a V-shaped transmission belt and a driving belt wheel disc and a driven belt wheel disc.

Description

[0001] This application is a divisional application, the application number of the original application: 201010538238.1, the application date: November 10, 2010, and the name of the invention: the speed ratio control device of the belt type continuously variable transmission. technical field [0002] The invention belongs to a speed ratio control device of a belt-type continuously variable transmission, which is mainly used for automobiles and motorcycles using the continuously variable transmission, and can also be applied to other occasions that need to transmit power in a belt-type continuously variable transmission. Background technique [0003] The automobile transmission must adapt to the different requirements of the vehicle on the driving wheel traction and vehicle speed under different driving conditions such as starting, accelerating, driving and overcoming various road obstacles. In order to make full use of the power of the engine, improve the fuel economy and im...

AI Technical Summary

Problems solved by technology

However, the efficiency of the hydraulic actuator is low. Research shows that the hydraulic system accounts for about 60% of the power loss of the metal belt continuously variable transmission, while the metal belt friction transmission only accounts for about 30%. At the same time, the hydraulic actuator requires high machining accuracy. This leads to higher cost; while using the torque cam mechanical adjustment method, the change of the speed ratio of the continuously variable transmission is generally accompanied by the change of the engine working condition, that is, the engine cannot be maintained in the optimal working area and only the speed of the continuously variable transmission needs to be adjusted. Ratio to meet the requirements of load changes, speed ratio adjustment accuracy can not be controlled

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