Pressure control valve

Abstract

Disclosed is a pressure control valve used in a clutch of an automatic transmission. The pressure control valve includes a valve body having a supply port, a control port and a discharge port therein; a first insert disposed inside the valve body, the first insert being formed with an inlet connected to the supply port and an outlet for discharging fluid supplied through the inlet; a ball disposed inside the first insert to open / close the outlet; a second insert coupled to the outlet side of the first insert, the second insert being formed with a first discharge hole connected to the control port and a second discharge hole connected to the discharge port; a rod movably provided to the valve body, the rod having one end extending toward the ball, the rod having a poppet formed in the middle thereof to open / close the second discharge hole; and a solenoid moving the rod. With the above structure, according to a current value applied on the solenoid, the outlet of the first insert and a second discharge hole of the second insert are opened and closed by use of the ball and the poppet, or the opening degree is adjusted, thereby effectively adjusting the pressure of the fluid discharged through the control port, and preventing unnecessary waste of the fluid.

Description

technical field [0001] The invention relates to a pressure regulating valve for a clutch of an automatic transmission, in particular to a proportional regulating valve for regulating fluid pressure according to a current value. Background technique [0002] Generally, a transmission is a speed change device that converts the power generated by the engine into the required rotational force according to the speed and transmits it. This transmission is divided into: a manual transmission in which the speed change process is realized through the driver's manual conversion and an automatic transmission in which the speed change process is automatically realized according to a certain pattern. [0003] The above-mentioned automatic transmission includes: a torque converter, a rotating device, a planetary gear device, a multi-plate clutch, an oil pressure control device, and an electronic control device. Among them, the multi-plate clutch consists of a clutch cage, a plurality of ...

AI Technical Summary

Problems solved by technology

In particular, ball and cone (poppet) pressure regulating valves usually use a two-way (2-way) method. When the regulating pressure is zero, all the fluid supplied by the hydraulic pump is discharged, and the oil consumption increases. Therefore, Considering the efficiency of the driving force of the engine, it becomes the cause of redundant loss

Moreover, the two-way pressure regulating valve needs to have an orifice at the inflow port of the supply fluid, so it has the disadvantages of complicated structure and difficult manufacture.

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