A metal belt type continuously variable transmission and method for controlling the speed of mechanical transmission by motor

Abstract

The invention discloses a metal belt type continuously variable transmission adopting motor-controlled mechanical transmission speed regulation. The transmission comprises a transmission shaft, a first lead screw, a second lead screw, a first speed regulation mechanism and a second speed regulation mechanism, wherein the transmission shaft comprises a driving shaft and a driven shaft arranged in parallel; the first lead screw is rotationally fixed to the driving shaft; the second lead screw is rotationally fixed to the driven shaft; the first speed regulation mechanism can drive a driving cone disc to move in the axial direction of the driving shaft; the second speed regulation mechanism is rotationally supported on a driven movable cone disc, is arranged on the second lead screw in a sleeving mode and is in threaded fit with the second lead screw; and the second speed regulation mechanism can drive the driven movable cone disc to move in the axial direction of the driven shaft. A pressurization speed regulation mechanism with a double-motor-controlled mechanical transmission mode is adopted, the number of hydraulic elements is reduced, the maintenance difficulty is lowered, and the transmission efficiency is improved. By means of the mechanical transmission speed regulation motor control method, the current of a rotor circuit of speed regulation motors is changed accurately, the rotation speed of the speed regulation motors can be adjusted, the service life of the motors is prolonged, the response time is shortened, and the endurance stability is improved.

Description

technical field [0001] The invention relates to the technical field of automobile transmission, in particular to a metal-belt continuously variable transmission that uses a motor to control the speed of mechanical transmission, and a method for controlling a speed-regulating motor of mechanical transmission. Background technique [0002] At present, the general CVT speed control and pressurization system is an electronically controlled hydraulic system. The characteristic of this type of system is that it can adjust the speed and apply pressure to the cone according to the requirements of the speed and torque according to the preset control strategy. The energy consumption and cost of the hydraulic system are high, and the reliability is low. The existing mechanical and electronically controlled continuously variable transmissions are mostly used in low-power conditions such as motorcycles or miniature cars, but because of their small power, it is not necessary to optimize t...

AI Technical Summary

Problems solved by technology

The characteristic of this type of system is that it can adjust the speed and apply pressure to the cone according to the requirements of the speed and torque according to the preset control strategy. , High installation accuracy and low reliability. The various hydraulic valves and pumps are the main energy-consuming components. According to relevant statistics, the pumps, hydraulic systems and torque converters in the continuously variable transmission consume the total input energy. 27% (calculated according to the Japanese 10-15 cycle conditions) or 16.7% (calculated according to the European NEDC cycle conditions), it is this energy loss that leads to the advantage of the continuously variable transmission to make the engine work in the best state and save fuel It has been weakened, and only achieves fuel consumption comparable to that of manual transmissions (MT). Although more efficient continuously variable transmissions have gradually come out, the efficiency loss caused by the hydraulic system cannot be ignored, and because the structure of continuously variable transmissions is often relatively Complicated, the hydraulic system requires high maintenance, and the damage to the continuously variable transmission cannot be repaired and can only be replaced as a whole

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