Booster Introduction-Jiaozuo Jianghe Brake Co., Ltd

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Booster Introduction

Release time:

2022-11-03 10:57

Source:

Keywords: brake, electric hydraulic block brake

Vacuum boosters are widely installed on cars as brake boosters, utilizing the vacuum at the engine throat to assist the driver in manipulating the brake pedal. According to the number of vacuum booster membranes, vacuum boosters are divided into two types: single diaphragm type and series diaphragm type.

Work process:

When the vacuum booster is not working (Figure a), spring 15 pushes the push rod and plunger 18 to the rear limit position (i.e. vacuum valve opens), and rubber valve 9 is pressed onto the air valve seat by the spring (i.e. air valve closes). The front and rear chambers of the servo chamber are connected to each other through channel A, control valve chamber, and channel B, and are isolated from the air. After the engine starts working and the vacuum check valve is opened, a certain degree of vacuum is generated in both the left and right chambers of the servo chamber.

When the brake pedal is pressed, the air chamber diaphragm seat 8 is initially fixed, and the control valve push rod 12 and control valve plunger 18 are pushed forward relative to the diaphragm seat 8 by the control force from the pedal mechanism. When the gap between the plunger and the rubber reaction disc 7 disappears, the control force is transmitted to the brake master cylinder push rod 2 through the reaction disc 7 (as shown in the following figure). At the same time, rubber valve 9 moves forward with the control valve plunger until it contacts the vacuum valve seat on diaphragm seat 8. At this point, the front and rear chambers of the servo chamber are isolated.

The control valve push rod 12 continues to push the control valve plunger forward until the air valve seat 10 on it leaves the rubber valve 9 at a certain distance. The external air is filled into the rear chamber of the servo chamber (as shown in the figure below), reducing its vacuum degree. During this process, diaphragm 20 and the valve seat continue to move forward until the valve comes into contact with the air valve seat again. Therefore, in any equilibrium state, the stable vacuum degree in the rear chamber of the servo chamber is an increasing function of the pedal stroke.

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