TYW FOOT OPERATED HYDRULIC AND DRUM BRAKE

Drum brakes use the brake transmission mechanism to make the brake shoes press the brake friction plates against the inner side of the brake drum, thereby generating braking force, decelerating the wheels or stopping in the shortest distance according to needs, so as to ensure driving safety and guarantee The car is reliably parked and cannot slide automatically. This article focuses on the lower drum brakes, and then talks about the advantages and disadvantages of drum brakes. Drum brake introduction

Generally, there is only one wheel cylinder on the brake drum of a car. After the wheel cylinder is subjected to hydraulic force from the master cylinder during braking, the pistons at both ends of the wheel will simultaneously push toward the flow ends of the left and right brake flow. The left and right pressure of the drum action on the brake shoe is asymmetrical, resulting in a self-increasing or self-decelerating effect.

Therefore, in the industry, the brake shoe on the side of the self-increasing force is called the lead shoe, and the brake shoe on the side of the self-relieving force is called the follower shoe. The friction torque of the lead shoe is 2 to 2.5 times that of the follower shoe. The degree of wear of the lining is also different.

Cars use drum brakes. The advantage is that the price of this brake is relatively cheap, and it is built according to the traditional design. As a result, the working efficiency of this brake is not as high as that of disc brakes, and the brake response of the car is not fast. The parking brake is to give the car a resistance when the car is parked, that is, the car's hand brake or the parking gear in the automatic transmission, which locks the car's drive shaft or rear wheels. The braking system used by the car is an electronic braking system.

The electronic parking brake system refers to the combination of temporary braking during driving and long-term braking after parking. The parking brake is realized by electronic control. The electronic handbrake is realized by electronic control. The working principle of the brake is the same as that of the mechanical hand brake. Both brake pads and brake discs rub against each other to generate friction to achieve the purpose of parking brake. Generally, the brakes of cars can be divided into drum brakes and disc brakes. Small cars generally use drum brakes.

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