Proportional hydraulic control valve group and metal belt continuously variable transmission

Abstract

The invention discloses a proportional hydraulic control valve set and a metal-belt type stepless transmission. The proportional hydraulic control valve set used for the metal-belt type stepless transmission comprises an integrated oil tank, an output belt wheel cylinder, an input belt wheel cylinder, a clutch cylinder and an oil pump, the integrated oil tank is used for storing oil, the output belt wheel cylinder is used for delivering the oil in the integrated tank to the stepless transmission, the oil pump delivers the oil to a torque converter, the input end of the oil pump is communicated with the integrated oil tank, the oil input end of the output belt wheel cylinder is communicated with the output end of the oil pump, a passive slide valve used for controlling pressure of the oil pumped into the output belt wheel cylinder and a passive pilot solenoid valve used for outputting pilot pressure to the passive slide valve so as to control pressure of the oil delivered from the passive slide valve to the output belt wheel cylinder are arranged at the oil input end of the output belt wheel cylinder, and the oil output end of the oil pump is communicated with the inlet end of the passive slide valve; the maximum pressure outputted by the passive pilot solenoid valve is smaller than that controlled by the passive slide valve. The pressure of the output belt wheel cylinder is controlled.

Description

technical field [0001] The invention relates to the field of hydraulic control mechanisms of continuously variable transmissions, in particular to a proportional hydraulic control valve group for metal-belt continuously variable transmissions. In addition, the present invention also relates to a metal-belt continuously variable transmission comprising the above-mentioned proportional hydraulic control valve group for the metal-belt continuously variable transmission. Background technique [0002] As a kind of automatic transmission, the metal belt continuously variable transmission has been widely used in the market. As the key assembly connecting the TCU (transmission electronic control unit) and the mechanical actuators of the transmission—the hydraulic system assembly is constantly changing with the continuous development of solenoid valve technology. [0003] Existing hydraulic systems usually use high-power proportional solenoid valves to directly control the input pul...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a proportional hydraulic control valve group for a metal belt continuously variable transmission and the metal belt continuously variable transmission to solve the direct problem of the existing hydraulic system through the high power proportional solenoid valve integrated by the pilot valve and the slide valve. Control pulley, output pulley oil cylinder pressure, valve plate size requirements, high precision requirements, high processing cost, poor filtration accuracy and control pressure stability technical problems

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