Inversely-proportional pressure relief valve for vehicle integrated transmission box

Abstract

The invention provides an inversely-proportional pressure relief valve for a vehicle integrated transmission box. The inversely-proportional pressure relief valve comprises a valve body, a hydraulic pressure relief valve and an electro-hydraulic proportional pressure relief valve; the hydraulic pressure relief valve is connected with the electro-hydraulic proportional pressure relief valve and arranged in the valve body; the hydraulic pressure relief valve comprises an inversely-proportional valve element and a spring which are connected mutually, the valve body is connected with a fan clutch,the spring is used for enabling the output oil pressure of the hydraulic pressure relief valve and the pilot control oil pressure of the electro-hydraulic proportional pressure relief valve to be ininverse proportion under the effect of the spring. According to the inversely-proportional pressure relief valve, the function of the electro-hydraulic proportional pressure relief valve is achieved,namely, the output pressure and a control current are in inverse proportion, the inversely-proportional pressure relief valve has the characteristic of inverse proportion, the output pressure of the proportional valve is maximum under the deenergized situation, and the output pressure of the proportional valve is minimum when the control current is maximum.

Description

technical field [0001] The invention relates to a pressure reducing valve, in particular to an inverse proportional pressure reducing valve used in a vehicle integrated transmission box. Background technique [0002] Most of the integrated transmissions of special vehicles have the function of driving fans, and cool down the engine and transmission through the fan cooling system. Among them, using a fluid viscous clutch to drive and control the fan is a relatively common driving method. The fan speed can be controlled by controlling the pressure of the fan fluid-viscous clutch. The higher the clutch pressure, the faster the fan speed; the lower the clutch pressure, the slower the fan speed. Therefore, an electro-hydraulic proportional pressure reducing valve should be used to proportionally control the pressure of the fan fluid-viscous clutch. The electronic control system sends a continuously changing electrical signal to the electro-hydraulic proportional pressure reduci...

AI Technical Summary

Problems solved by technology

There are also some problems with the few inverse proportional pressure reducing valves, such as too few varieties to meet different pressure and flow requirements, long delivery cycle, etc.

Images