Speed ratio control device with belt type continuously variable transmission

Abstract

The invention discloses a speed ratio control device with a belt type continuously variable transmission, comprising a DC motor and a controller thereof, two gear transmission mechanisms, two helical screw mechanisms, two spring assisting mechanisms, a plurality of plane bearings and a plurality of needle bearings, wherein the DC motor as a power source of the speed ratio control of the band-type continuously variable transmission converts the deflection angle of the DC motor into the axial displacement of a belt wheel moving disc of the belt type continuously variable transmission under the matching of a spring through the two gear transmission mechanisms and the helical screw mechanisms respectively connected with the gear transmission mechanisms by controlling the deflection and the deflection angle of the DC motor so as to realize the continuous change of the speed ratio of the belt type continuously variable transmission under different working conditions by changing the contact radii between a V-shaped transmission belt and a driving belt wheel disc and between the V-shaped transmission belt and a driven belt wheel disc.

Description

technical field [0001] 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 [0002] 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 improve the emission performance of the car, an ideal car transmission should have a continuously variable transmission ratio and be able to perform optimal control of the speed ratio. [0003] At present, most of the continuously variable transmissions used in automobiles and mot...

AI Technical Summary

Problems solved by technology

However, the efficiency of the hydraulic actuator is low. The 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 costs; 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 operating conditions, 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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