Braking unloading prefill valve group

Abstract

The invention discloses a braking unloading prefill valve group. A first pressure measuring connector, a second pressure measuring connector, a safety valve, a second one-way valve and a hydraulic control reversing valve are arranged on the surface of the upper portion of a valve body; a conversion shuttle valve and a first one-way valve are arranged on the first side face connected with the surface of the upper portion, and an unloading valve is arranged on the second side face opposite to the first side face; and an oil outlet A and an oil outlet B are formed in the third side face, the third side face is adjacent to the first side face and the second side face, and a pressure sensor, an oil return port T and an oil supply port P are formed in the fourth side face opposite to the third side face. According to the valve group, the safety valve, the hydraulic control reversing valve, the pressure sensor, the first one-way valve, a second one-way valve, the unloading valve, the conversion shuttle valve, the first pressure measuring connector, the second pressure measuring connector, a port P, a port T, a port A, a port B and other components are integrated on one base body, and the valve group is lighter in mass, more compact in structure, more rapid in response and higher in response precision; and the functions of automatic liquid filling of two oil ways and unloading after liquid filling are completed can be achieved.

Description

technical field [0001] The invention relates to the field of vehicle brake control, in particular to a brake unloading fluid filling valve group. Background technique [0002] At present, the liquid charging scheme of the hydraulic brake system of large engineering vehicles mainly uses the accumulator liquid charging valve to keep the pressure of the accumulator within a certain range, which meets the requirements of the relevant standards for the full power energy storage hydraulic brake system. Most of the existing liquid filling valves adopt the structural design of plate valves, and their materials are all made of cast iron, which has large dimensions, heavy weight, complex structure, difficult assembly of many parts, and high requirements for valve core processing technology. Consistency is bad. The unloading / loading ratio of existing filling valve products cannot be changed arbitrarily after factory setting, which limits the liquid storage capacity of the accumulator....

AI Technical Summary

Problems solved by technology

Most of the existing liquid filling valves adopt the structural design of plate valves, and their materials are all made of cast iron, which has large dimensions, heavy weight, complex structure, difficult assembly of many parts, and high requirements for valve core processing technology. poor consistency

The unloading / loading ratio of existing liquid charging valve products cannot be changed at will after factory setting, which limits the liquid storage capacity of the accumulator

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