A vacuum degree amplifying device for a vacuum booster in an automobile braking system

Abstract

The invention provides a vacuum degree amplifying device for an automobile braking system vacuum booster, and belongs to the technical field of automobile parts. The problem that an existing vacuum degree amplifying device is poor in vacuum degree amplifying effect is solved. The vacuum degree amplifying device for the automobile braking system vacuum booster comprises a main pipe body which is provided with an air inlet end and an air outlet end, and the side wall of the main pipe body is provided with an auxiliary pipe body; a convex portion is arranged in the main pipe body and provided with an air passing hole, the segment, facing to the air outlet end, of the air passing hole serves as an amplification segment, the hole diameter of the amplification segment is gradually decreased from the two ends to the middle, an adapting pipe is inserted into an air inlet segment, an air passing gap is formed between the outer edge of an end opening of the adapting pipe and the hole wall of the amplification segment, and the air passing area of the air passing gap is smaller than that of the adapting pipe. According to the vacuum degree amplifying device for the automobile braking system vacuum booster, the amplifying effect is better, and therefore the safety and comfortableness of automobile braking are improved.

Description

technical field [0001] The invention belongs to the technical field of auto parts, and relates to a vacuum degree amplifying device of a vacuum booster of an auto brake system. Background technique [0002] With the gradual tightening of domestic and foreign safety regulations on the braking performance of passenger cars, and the increasingly stringent requirements of customers on the braking performance of the vehicle, the traditional method of providing a vacuum source through the engine intake manifold is subject to the influence of the engine and the outside world. Due to the limitation of environmental conditions, it can no longer fully meet the customer's requirements for braking performance, especially in harsh working conditions such as plateaus and mountain roads with long slopes. The customer feels that the brake pedal is heavy and the car cannot be braked, which affects the safety and comfort of the braking system. The current automotive vacuum amplifying device c...

AI Technical Summary

Problems solved by technology

[0002] With the gradual tightening of domestic and foreign safety regulations on the braking performance of passenger cars, and the increasingly stringent requirements of customers on the braking performance of the vehicle, the traditional method of providing a vacuum source through the engine intake manifold is subject to the influence of the engine and the outside world. Due to the limitation of environmental conditions, it can no longer fully meet the customer's requirements for braking performance, especially in harsh working conditions such as plateaus and mountain roads with long slopes. The customer feels that the brake pedal is heavy and the car cannot be braked, which affects the safety and comfort of the braking system. The current automotive vacuum amplifying device can amplify the vacuum of the vacuum booster, especially in harsh environments. , significantly increase the pedal ratio of the brake pedal, ensure that customers can brake the car under the condition of small pedal force, and improve the safety and braking comfort of the vehicle braking system. At present, there are many ways to improve the vacuum degree of the vehicle vacuum booster , such as adding an electronic vacuum pump, adding a mechanical pump to the engine, etc., but these methods are costly and have low service life and stability

[0003] In view of the above problems, the Chinese invention patent application (application number: 201410491587.0) discloses a vacuum assisted check valve, which includes a first inlet port connected to a vacuum booster, an outlet port connected to an engine intake manifold and a The second air intake end connected to the air filter, the second air intake end communicates with the air outlet end through the air intake pipeline, and a first cavity vertically communicated with the air intake pipeline is provided at the smallest diameter of the air intake pipeline, and the air intake pipeline The pipe diameters in the direction from the first air intake end to the first cavity and from the air outlet end to the first cavity are gradually reduced; the end of the first air intake end away from the vacuum booster pump is provided with a first valve plate and a second valve plate , the first air inlet communicates with the first cavity through the first valve plate, and communicates with the second cavity connected with the air intake pipeline through the second valve plate, and the second cavity is closer to the air outlet; this one-way The valve utilizes the Venturi effect to expand the vacuum degree, but the formed vacuum area is located at the air filter connection end on the same flow channel line, and the vacuum degree is difficult to be given to the vacuum booster in time, resulting in poor vacuum degree amplification effect

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