A New Type of Pressure Stabilizing and Relief Valve

Abstract

The invention belongs to a hydraulic control technology, and particularly relates to a pressure stabilization overflow valve for a hydraulic control system of an automatic transmission. At present, the pressure stabilization function is achieved mainly through cooperation of multiple function valves, the overflow valve is liable to be affected by pressure fluctuation, the structure is complex, and the occupied mounting space is relatively large. The novel pressure stabilization overflow valve comprises a valve sleeve, a valve core, springs, a limiting plug, an oil return hole, a working hole and an oil inlet, wherein the limiting plug is in threaded connection with one opening end of the valve sleeve; the oil inlet is in the other end of the valve sleeve; the valve core is a cylindrical slide valve; the valve core has an annular bulge on the outer side; an axial oil hole and a radial overflow hole which communicates with the axial oil hole are formed in the side, near the oil inlet, of the valve core; and the limiting plug presses the valve core on the step surface of an inner hole of the valve sleeve through the springs. According to the novel pressure stabilization overflow valve, the problems that a pressure stabilization device in the hydraulic control system of the automatic transmission is affected by pressure fluctuation at the back end, the structure is complex, and the occupied mounting space is relatively large are solved.

Description

technical field

[0001] The invention belongs to hydraulic control technology, in particular to a pressure stabilizing overflow valve used in a hydraulic control system of an automatic transmission. Background technique

[0002] In the automatic transmission hydraulic control system, a constant pressure before the clutch control valve is realized through a pressure stabilizing device, and a large flow is distributed for the operation of the hydraulic torque converter at the same time. Since the pressure drop produced by the hydraulic torque converter is different at different flow rates and temperatures, it is necessary for the pressure stabilizing device to pass a large flow rate and keep the pressure before the valve from being affected by fluctuations at the rear end. At present, the voltage stabilization function is mainly realized through the combination of several functional valves, which is easily affected by pressure fluctuations, and has a complex structure and takes...

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