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Is the Brake Booster Vacuum Pump always a vacuum when the engine is working?

Pulished on Nov. 21, 2019

Is the Brake Booster Vacuum Pump always a vacuum when the engine is working?

The Brake Booster Vacuum Pump uses the principle of inhaling air while the engine is operating, causing a vacuum on one side of the booster to create a pressure differential relative to the normal air pressure on the another side, which is used to increase the brake thrust. Even if there is only a small pressure difference on both sides of the diaphragm, due to the large area of the diaphragm, a large thrust can be generated to push the diaphragm to move toward the end of the pressure.

Brake Booster Vacuum Pump

Brake Booster Vacuum Pump

A vacuum pump is a device or device that uses a mechanical, physical, chemical, or physicochemical method to evacuate a pumped container to obtain a vacuum. In general, a vacuum pump is a device that uses various methods to improve, create, and maintain a vacuum in an enclosed space. According to the working principle of the Vacuum Brake Booster Kits, the vacuum pumps can basically be divided into two types, namely gas trapping pumps and gas transfer pumps. It is widely used in metallurgy, chemical, food, electronic coating and other industries.

In the working state, the pushrod return spring causes the brake pedal to be in the initial position. At this time, the check valve of the vacuum tube and the vacuum booster is in an open state, and inside the booster, the diaphragm divides it into a vacuum gas. The chamber and the application chamber are connected to each other, and most of the time they are isolated from the outside, and the chamber is connected to the atmosphere by means of two valve devices.

When the engine is running, the brake pedal is depressed, and under the action of the push rod, the vacuum valve is closed, and at the same time, the air valve at the other end of the push rod is opened and after the air enters (the reason for pressing the brake pedal to generate a gasping sound) ) will cause the air pressure in the cavity to be unbalanced. Under the action of the negative pressure, the diaphragm is pulled toward the end of the brake master cylinder, which in turn drives the push rod of the master cylinder, which further enlarges the leg strength. The function.

The vacuum of the brakes is generally from two places. One is to take the vacuum directly from the intake manifold (the air pressure of the intake manifold is smaller than the atmospheric pressure, especially in the process of high-speed pumping), and the vacuum pump of the vehicle itself is generally. For example, a supercharged engine must have a vacuum pump. Vehicle vacuum matching is generally designed with various extreme conditions in mind. So as long as the vehicle is normal, often braking on the brakes will not lose the vacuum. The vacuum pump found that the brake vacuum was not enough and it would work immediately to evacuate. The situation in which the vacuum is lost is that the vacuum system is not sealed and is directly connected to the atmosphere. The so-called fire and vacuum, I guess your understanding corresponds to the reality: the vehicle brake vacuum is insufficient, start the engine, the vehicle computer detects the lack of vacuum, will immediately drive the vacuum pump to vacuum, so the result is a dozen There is a vacuum in the fire. Our company is the Vacuum Brake Booster Kit Factory, welcome to come to us.