How Does a Car Vacuum Booster Work?
1 Answers
The working principle of a car vacuum booster is as follows: during braking, when the brake pedal is depressed, the control force from the pedal mechanism pushes the control valve push rod 12 and the control valve plunger 18 forward. After eliminating the gap between the plunger and the rubber reaction disc 7, it continues to push the brake master cylinder push rod 2. The brake fluid in the master cylinder flows into the brake wheel cylinder at a certain pressure, and this force is provided by the brake pedal mechanism. At the same time, under the action of the valve spring 16, the vacuum valve 9 also moves forward until it presses against the valve seat of the diaphragm housing, thereby isolating channels A and B, i.e., separating the front and rear chambers of the servo chamber. Subsequently, the air valve opens away from the vacuum valve, allowing air to pass through the filter ring 11, the felt filter ring 14, the opening of the air valve, and channel B to fill the rear chamber of the servo chamber. As air fills in, a pressure difference occurs on both sides of the servo chamber diaphragm 20, generating a thrust. This thrust pushes the brake master cylinder push rod 2 forward through the diaphragm housing 8 and the rubber reaction disc 7, and this force is provided by the pressure difference. At this point, the force acting on the brake master cylinder push rod is the sum of the pedal force and the thrust from the servo chamber reaction disc, causing the output pressure of the brake master cylinder to multiply. Relevant information about the vacuum booster is as follows: 1. Introduction: The vacuum booster is generally located between the brake pedal and the brake master cylinder. For ease of installation, it is usually integrated with the master cylinder as a single unit, with part of the master cylinder extending into the vacuum booster housing. 2. Basic Structure: The vacuum booster mainly consists of a vacuum servo chamber and a control valve. The vacuum servo chamber is composed of front and rear housings 1 and 19, with a servo chamber diaphragm 20 sandwiched between them, dividing the servo chamber into front and rear chambers.
