A drum brake automatic cooling system

Abstract

The invention relates to an automatic cooling system for a drum brake. The system comprises a thermistor, a comparator TL431, a PWM square-wave generator NE555, and a field-effect tube Q3, wherein the thermistor is used for probing the temperature of a brake block in the brake; the comparator TL431 is switched on when the temperature of the thermistor RV is higher than a predetermined value, and is switched off when the temperature of the thermistor RV is lower than a predetermined value; a turn-on signal output by the comparator TL431 triggers the PWM square-wave generator NE555 to work to output a square wave signal; the field-effect tube Q3 switches on or switches off a water pump according to the square wave signal of the PWM square-wave generator NE555; and the water outlet of a water storage tank is connected to the water inlet of the water pump, and the water outlet of the water pump is connected to the brake through a pipeline and a nozzle connected to the pipeline is arranged at the brake. The cooling system is started and regulated in speed by means of change of resistance value of the thermistor for automatically cooling, so that manual participation of a driver is reduced and the driving safety is improved.

Description

technical field [0001] The invention relates to the technical field of drum brake cooling, in particular to an automatic drum brake cooling system. Background technique [0002] In recent years, the number of automobiles in my country has increased rapidly, and the influx of a large amount of transportation resources into the market has provided comfort and convenience for production to a large extent. However, the incidence of traffic accidents in our country remains high, especially for those large passenger cars and large trucks that often drive in mountainous areas, most of their brakes are drum brakes, which are closed in structure and poor in heat dissipation. In the process of long and large downhill, the driver frequently uses the brakes, which causes the brakes to heat up rapidly, and the braking efficiency undergoes thermal decline, which is prone to major traffic accidents. The traditional cooling water spray system needs to rely on the driver to determine the in...

AI Technical Summary

Problems solved by technology

However, the incidence of traffic accidents in our country remains high, especially for those large passenger cars and large trucks that often drive in mountainous areas, most of their brakes are drum brakes, which have a closed structure and poor heat dissipation

In the process of long and large downhill, the driver frequently uses the brakes, causing the brakes to heat up rapidly, causing thermal decline of the braking efficiency, and causing major traffic accidents easily

The traditional cooling water spraying system needs to rely on the driver to determine the initial cooling time based on subjective experience, and needs to manually start the water spraying device. There are unsafe factors such as unscientific cooling time selection and driver's inattention.

Images