Speed ratio control device for belt type continuously variable transmission of automobile and motorcycle

Abstract

The invention discloses a speed ratio control device for a belt type continuously variable transmission of an automobile and a motorcycle. The device comprises a direct current motor and a controller of the direct current motor, two groups of gear transmission mechanisms, two groups of spiral screw mechanisms, two groups of spring booster mechanisms and a plurality of plane bearings and needle bearings. The direct current motor serves as a speed ratio control power source of the transmission and converts motor rotation angles into axial displacement of a belt wheel movable disc of the belt type continuously variable transmission through the two groups of the gear transmission mechanisms and the spiral screw mechanisms connected with the gear transmission mechanisms respectively and under the cooperation of springs, contact radii of a V-shaped transmission belt with drive and driven belt wheel discs are changed, and accordingly, continuous speed ratio variations of the continuously variable transmission in different working conditions is achieved.

Description

[0001] This application is a sub -application application. The application number of the original application: 201010538238.1, application date: November 10, 2010, invention creation name: The speed -ratio control device of the bandless transmission. Technical field [0002] The present invention is a speed -ratio control device for the stepless transmissions. It is mainly used to use a automatic transmission car and motorcycle. It can also be applied to other occasions that need to transmit power in a bead -free transmission. Background technique [0003] The car transmission must adapt to different requirements for the degradation and speed of the driving wheels under the beginning of the start, acceleration, driving, and overcoming various road obstacles.In order to make full use of the power of the engine to improve the fuel economy and improve the discharge performance of the car, the ideal car transmission should have a variable -free transmission ratio and can perform speed...

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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