Continuously variable transmission

Abstract

The invention discloses a continuously variable transmission. The continuously variable transmission comprises a pump and a motor, the pump is a constant displacement pump or a variable displacement pump, the motor is a fixed displacement motor or a variable displacement motor, and at least one of the pump and the motor is a variable displacement structure; and a high-pressure input port of the motor communicates with a high-pressure output port of the pump, a low-pressure input port of the pump communicates with a low-pressure output port of the motor, an inner rotor of the pump is power input, an outer rotor of the pump is power output, and the outer rotor of the pump and an inner rotor of the motor are of a rigid connection structure or a rigid integrated structure. According to the continuously variable transmission, due to the fact that the rotating torque borne by the outer rotor of the pump and the output torque of the motor are output in an overlapping mode, the system efficiency and the output rotating speed are greatly improved, when the rotating torque required by the load is close to the rotating torque of the inner rotor of the pump, the output rotating speed of the continuously variable transmission is close to the input rotating speed, and the efficiency of the continuously variable transmission is close to 100%.

Description

technical field [0001] The invention relates to the field of mechanical variable speed transmission, in particular to a continuously variable transmission, especially to the field of vehicle continuously variable transmission. Background technique [0002] The vehicle transmission has been pursuing a more perfect continuously variable transmission. An ideal transmission can match the load of the vehicle and the dynamic characteristics of the engine continuously and in real time. The main forms of continuously variable transmissions equipped on vehicles are belt (or chain) continuously variable transmissions (CVT) and roller rotary disc type continuous infinite transmissions (IVT). Belt (or chain) continuously variable transmission CVT has the advantages of continuously adjustable speed ratio, good smoothness, small and simple structure, and the disadvantage is that it requires high manufacturing process and it is difficult to transmit large torque; the roller turntable conti...

AI Technical Summary

Problems solved by technology

Belt (or chain) continuously variable transmission CVT has the advantages of continuously adjustable speed ratio, good smoothness, small and simple structure, and the disadvantage is that it requires high manufacturing process and it is difficult to transmit large torque; the roller turntable continuous continuously variable transmission IVT, Composed of discs and rollers, the structure is simple, but the friction between the discs and rollers causes large energy loss, temperature rise, and low product reliability

[0003] In the field of engineering vehicles, for example, in the hydraulic drive travel system of excavators and forklifts, the travel system is composed of separate hydraulic pumps and hydraulic motors, the system structure is complicated, the cost is high, and the efficiency is low

[0004] In the field of high-speed engineering vehicles, the main reason for its high-speed limitation is that the separation and coordination of the hydraulic pump and hydraulic motor in the hydraulic drive travel system cannot meet the requirements of high-speed travel.

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