What is a brake drum?

The brake drum is a fragile gray cast iron material, similar to the iron casting of the tambourine, fixed to the tire and rotating at the same speed. When braking is required, the oil pressure pushes the brake shoe to contact the inner edge of the brake drum, and the friction generated by the contact rotates the tire to achieve the purpose of braking. The brake drum is not properly designed or easily deformed when heated, and the unbalanced force will also produce mechanical deformation, causing poor contact between the shoe and the drum, resulting in pedal force and stroke. Therefore, the brake drum should have sufficient wall thickness, and the outer surface near the opening of the cast circumferential or axial reinforcement to improve strength.

How much brake drum wear needs to be replaced

When the brake drum is worn to the limit value, it needs to be replaced. The specific limit value is φ180mm for the brake drum with a diameter of 180mm. However, the replacement cycle of the brake drum will be affected by many factors, including the operation of the vehicle, the type of vehicle, the weight of the vehicle, the type of brake pads, etc. Therefore, the replacement cycle of the brake drum may vary from vehicle to vehicle and needs to be determined according to the actual situation. In addition, the replacement of brake drums is usually based on the replacement of brake pads.

Wheel hub installation precautions

Regular inspection: No matter how old the car is, the wheel hub bearings should be inspected regularly to ensure safety and reliability. Pay attention to whether the bearing has early warning signs of wear, such as friction noise during rotation or abnormal deceleration of the suspension combination wheel when turning. For rear-wheel drive vehicles, it is recommended to lubricate the front wheel hub bearings when the vehicle has traveled to 38000 kilometers.

What material is the wheel hub made

The wheel hub is usually made of three materials: steel, aluminum alloy and magnesium alloy. Steel wheels have low cost, but poor heat dissipation and rust resistance; aluminum alloy wheels are light and can reduce fuel consumption, but the price is higher; magnesium alloy wheels are lighter, but the price is higher. [2]. Aluminum alloy wheel hub is one of the common hub materials, and magnesium alloy wheel hub is a new material. Steel wheels are cheaper but have a shorter service life, while magnesium alloy wheels are more expensive but have a longer service life. In addition, there are three manufacturing methods for wheels: gravity casting, forging and low pressure casting.

What is the hub

The wheel hub is an important part of auto parts. It connects the tire and the axle and plays a supporting and guiding role. The material and design of the wheel hub directly affect the driving performance and safety of the car. In order to reduce the mass of the wheel, a new type of lightweight alloy wheel with built-in air alloy wheel came into being, and the mass of the wheel was further reduced by cavity technology.