Belt type infinitely variable transmission speed ratio control device capable of improving speed ratio adjustment accuracy

Abstract

The invention discloses a speed ratio control device of a belt type infinitely variable transmission. The speed ratio control device of the belt type infinitely variable transmission 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 assistance mechanisms, a plurality of surface bearings and a plurality of needle bearings. The direct current motor servers as a power source for controlling speed ratio of the transmission, the turning angle of the motor is transformed into axial displacement of a belt pulley moving plate of the belt type infinitely variable transmission by controlling a steering and turning angle of the motor and through the two groups of gear transmission mechanisms, the spiral lead screw mechanisms respectively connected with the gear transmission mechanisms and the matching of springs, further contact radius of a V type transmission belt and a driven belt wheel plate is changed, and accordingly continuous change of speed ratio of the infinitely variable transmission under different working conditions can be achieved.

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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