A vehicle hydraulic brake booster

Abstract

The invention provides a hydraulic braking pressurizer for a vehicle and belongs to the field of hydraulic braking parts and systems for vehicles. Due to the fact that communicating and blocking of a high-pressure cavity and an input opening of braking fluid are controlled though matching of a first leading-out hole and a second leading-out hole, an unloading spring (or a pressure spring) is omitted, the hidden danger that the pressurizing function disappears due to faults of the unloading spring in the using process of the pressurizer is fundamentally eliminated, and the safety and the reliability are improved.

Description

technical field [0001] The invention relates to a brake pressure distribution system of a vehicle hydraulic brake supercharger, which belongs to the field of vehicle hydraulic brake components and systems. Background technique [0002] At present, brake boosters, such as vacuum boosters and pneumatic boosters, are widely used in vehicle hydraulic braking systems at home and abroad. The power can reduce the driver's brake pedal force, and the effect is good, but the structure is complicated, the volume is large, the maintenance is difficult, and the power assist function will be lost after the engine is turned off. [0003] The existing hydraulic brake booster (or booster) uses the booster piston rod to make the output port output a higher pressure, avoiding the shortcomings of other boosters relying on the power source of the automobile engine; but when it is working, the booster Pressure control uses the unloading valve controlled by the unloading spring (or the slide valv...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of potential failure of the unloading spring, the present invention provides a hydraulic brake booster, including: a booster piston rod, a housing, a return spring and a sealing ring for the hole, and the booster piston rod is provided with a large end and the small end, the small end diameter is D 2 , the big end diameter is D 1 and D 1 >D 2 ; The housing is sequentially provided with a brake fluid input port, a low-pressure chamber, a high-pressure chamber, and a high-pressure brake fluid output port, and the brake fluid input port, low-pressure chamber, high-pressure chamber, and high-pressure brake fluid output port are sequentially arranged The low-pressure chamber and the high-pressure chamber are collectively called the inner chamber; the booster piston rod is axially slidably installed in the inner cavity of the housing, the large end of the booster piston rod matches the low-pressure chamber, and the small end of the piston rod matches the high-pressure chamber. Cooperate; the sealing ring for the hole is installed on the big end of the booster piston rod to seal the booster piston rod and the inner peripheral wall of the low-pressure chamber, the return spring is installed between the booster piston rod and the inner cavity of the housing, and the booster piston rod is in the position of the return spring Under the action of elastic force, it leans against the inner end wall of the low-pressure chamber of the housing; it is characterized in that: the booster piston rod is provided with a first through hole communicating with the high-pressure chamber, and the first through hole is connected to the side circumference of the booster piston rod. The first extraction hole on the surface is connected, and the second extraction hole is provided on the inner peripheral wall of the housing cavity. The housing or the booster piston rod is provided with a second through hole that communicates with the brake fluid input port. The second through hole The hole communicates with the second outlet hole; in the free state, the first outlet hole is in contact with the second outlet hole and communicates with the high-pressure chamber and the brake fluid input port, and the pressure boosting piston rod is subjected to the pressure difference between the low-pressure chamber and the high-pressure chamber. After the high-pressure chamber advances, the first lead-out hole and the second lead-out hole are staggered, and the inner peripheral wall of the housing cavity covers the first lead-out hole, cutting off the passage between the high-pressure chamber and the brake fluid input port

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