Auxiliary braking device of vehicle

Abstract

An auxiliary braking device of a vehicle comprises braking mechanisms, a front wheel brake and a rear wheel brake. Each braking mechanism comprises an auxiliary valve, a braking valve, an oil cup, an oil supplementing one-way valve and a braking cylinder and further comprises an air bag, a double-cavity air braking valve, a first energy accumulator, a first air control hydraulic valve, a second energy accumulator and a second air control hydraulic valve. The braking mechanisms are mounted on the front wheel brake and the rear wheel brake respectively. The energy accumulators are adopted as a power source, and auxiliary braking can be carried out after stalling of an engine. An air channel is arranged between each double-cavity air braking valve and the corresponding air control hydraulic valve, the response speed of the brakes is increased, and no braking delaying phenomenon occurs. When the front wheel brake and the rear wheel brake are too far away from each other currently, the response time difference between the front wheel brake and the rear wheel brake is relatively short, rear wheel braking is not obviously delayed, the braking performance is not influenced, and no traffic accident is caused.

Description

technical field [0001] The invention relates to a vehicle, in particular to a vehicle booster braking device. Background technique [0002] As people pay more and more attention to the protection of the natural environment, pollution-free electric vehicles have become a popular direction. Due to the cancellation of the traditional fuel engine, the original vacuum booster loses vacuum and cannot assist braking. Chinese Patent Application No. 200810163260.5 discloses a hydraulic power-assisted braking device, which uses a hydraulic booster instead of a vacuum booster to solve the problem that the power-assisted braking cannot be performed due to the cancellation of the fuel engine, but the above-mentioned invention is driven by the engine. After the engine is turned off, the hydraulic pump will no longer work, so it will not be able to produce pressure oil. Therefore, when the engine is turned off, power-assisted braking cannot be achieved, which will cause traffic accidents. ...

AI Technical Summary

Problems solved by technology

[0002] As people pay more and more attention to the protection of the natural environment, pollution-free electric vehicles have become a popular direction. Due to the cancellation of the traditional fuel engine, the original vacuum booster loses vacuum and cannot assist braking.

Chinese Patent Application No. 200810163260.5 discloses a hydraulic power-assisted braking device, which uses a hydraulic booster instead of a vacuum booster to solve the problem that the power-assisted braking cannot be performed due to the cancellation of the fuel engine, but the above-mentioned invention is driven by the engine. After the engine is turned off, the hydraulic pump will no longer work, so it will not be able to produce pressure oil, so when the engine is turned off, the power-assisted braking cannot be realized, which will cause traffic accidents

The above invention uses hydraulic oil for braking. Since the maximum flow rate of hydraulic oil generally does not exceed 6m / s, when the brake pedal assembly is far away from the brake, the pressure oil acts on the braking force of the brake when the brake pedal assembly is stepped on. The slave cylinder takes a long time, so there will be braking hysteresis, and because the general front wheel brake is closer to the brake pedal assembly, the pressure oil will first enter the brake cylinder of the front wheel brake for braking, and the front wheel brake and When the distance between the rear wheel brakes is relatively long, the time difference between the pressure oil acting on the brake cylinders on the front wheel brakes and the rear wheel brakes is relatively long, and the rear wheel brakes will obviously lag behind, seriously affecting the braking performance and causing traffic accidents. ACCIDENT

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