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Working Principle Of Brake Vacuum Pump Jan 09, 2020

The brake booster vacuum pump uses the principle of inhaling air when the engine is operating, causing a vacuum on one side of the booster to generate a pressure difference with respect to the normal air pressure on the other side. This pressure difference is used to strengthen the brake thrust. Even if there is only a small pressure difference between the two sides of the diaphragm, due to the large area of the diaphragm, a large thrust can still be generated to push the diaphragm to the side with the lower pressure.

In the working state, the push rod return spring makes the brake pedal in the initial position. At this time, the check valve at the connection position of the vacuum tube and the vacuum booster is open. Inside the booster, the diaphragm divides it into vacuum gas. Chamber and application air chamber, these two air chambers can communicate with each other, both of them are isolated from the outside world most of the time, the air chamber can be connected to the atmosphere through two valve devices.

When the engine is running, press the brake pedal. Under the action of the push rod, the vacuum valve is closed. At the same time, the air valve at the other end of the push rod is opened. ) Will cause a state of unbalanced air pressure in the cavity. Under the effect of negative pressure, the diaphragm is pulled towards one end of the master cylinder, and then the push rod of the master cylinder is driven, which further enlarges the leg force. Functions.