Automatic brake adjustment arm (hereinafter referred to as automatic adjustment arm) is a key component in automobiles. In order to improve the safety of the use of vehicles, China released GB12676-1999 "Automobile Brake System Structure and Performance on January 8, 1999". And test method "national standards", which put forward perfect requirements for the performance and test of the automobile brake system, and stipulate that the manual mechanical adjustment arm be forcibly removed after 2002, and that the brake system of the running vehicle must be able to wear the brake. auto-adjust.
In the field of commercial vehicles, there are mainly two types of components that directly actuate brake shoes: one is a camshaft driven by pneumatic pressure, and the other is a hydraulically actuated reciprocating piston that is a brake cylinder. The former has a wide range of applications, especially medium and heavy vehicles, while the latter is used only in light vehicles and small vehicles due to limited driving power. The brake gap automatic adjustment arm is an automatic gap adjustment device for a drum brake driven by a camshaft.
The friction brake of a drum brake is a brake drum and a brake shoe (sheet), and the gap between them (ie brake clearance) reflects the time and effectiveness of the driver's manipulation of the brake pedal. As the brake shoe wears, the brake gap increases, resulting in increased braking time, increased braking distance, and increased risk; if the wheel brake gap on the same axis is not equal, it will also cause the car Brake deviation: Therefore, it is important to keep the braking gap stable while the vehicle is running. An effective way to achieve this goal is to constantly adjust it. Although the manual adjustment method is simple in structure and low in cost, it needs regular parking maintenance and adjustment, which is laborious, troublesome, and unreliable; therefore, an automatic brake adjusting device has been developed and utilized, and has gradually replaced manual adjustment. method. Some vehicles can still be manually checked and adjusted after the automatic adjustment device is installed.
The brake gap automatic adjustment arm only acts on the excess clearance that is increased by wear of the brake pads. This means that the elastic combination of brake drum, brake pad and S camshaft will not affect the automatic adjustment process. Therefore, the brake gap automatic adjustment arm provides a constant and reasonable between brake pad and brake drum. Clearance. The working principle of the automatic adjustment arm of the brake clearance, the automatic adjustment arm does not work in the elastic range of the brake, and is only automatically adjusted in the clearance area.
The biggest advantage of the automatic brake adjustment arm is that the clearance adjustment is performed at the end of the braking with the minimum torque, thus ensuring safety and long working life.
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