Wheel hub: Wheel hub is also called rim, tire bell, and wheel. It is a metal part that is barrel-shaped and the center is mounted on the shaft. The wheel hub is based on the length of the diameter, the width, and the difference in molding methods., Different materials used are divided into many different types.

In terms of classification, it can be roughly divided into two types: baking paint and electroplating. The main consideration in the selection of wheels for ordinary models is whether the heat dissipation is good. The appearance is not very important. The process is basically treated with baking paint, that is, spraying first and then electric Bake, the cost is more economical, the color is beautiful, and the retention time is long.

Brake drum: The brake drum is the friction couple of the drum brake in the drum brake system. It has a high and stable friction coefficient, proper wear resistance, heat resistance, heat dissipation and heat capacity, etc., and relatively high strength And stiffness, but it will become brittle after aging.

The brake drum is an important part of the drum brake, and the role of the brake disc in the disc brake is similar. When braking, the piston exerts pressure on two pairs of half-moon brake shoes to make them close to the inner wall of the drum, thereby generating friction to stop the rotation of the wheel.