The rear axle of semi-trailer, also known as trailer axle or trailer axle, is mainly used to support all or part of the gravity of the trailer and transmit various external forces and reaction forces to ensure the vehicle's running.

The rear axle of semi-trailer is not equipped with drive and steering functions, and mainly consists of axle body assembly, brake device and hub assembly.

Next, we will learn about the rear axle of the trailer according to the product implementation standard JTT475-2020.

1. Rated axle load

The maximum allowable load that the axle can bear as specified by the manufacturer.

2. Axle track width

In design, the distance between the stress center points of the tires at both ends of the axle.

3. Suspension center distance

The distance between suspension support points.

4. Axle body

Components that can be equipped with relevant components and systems to support all or part of the gravity of the trailer and transmit various external forces and reaction forces to ensure the normal operation of the trailer.

5. Wheel mounting surface spacing

It is located at both ends of the axle body, and is used for the distance between the two ends in contact with the wheel mounting surface.

6. Shaft body assembly

An assembly equipped with relevant parts on the axle body for the installation, fixation and normal use of the brake device, including drum brake axle body assembly and disc brake axle body assembly.

(1) Drum brake shaft assembly

An assembly composed of shaft body, brake base plate, brake chamber bracket, camshaft bracket, etc.

(2) Disc brake shaft assembly

An assembly composed of shaft body, brake base plate, etc.

7. Braking device

A combination of parts and components that can slow down, stop or maintain the stop state of moving parts or moving machinery, commonly used are drum brakes and disc brakes.

(1) Drum brake

The brake with cylindrical surface as the contact surface of friction pair includes brake drum, brake shoe assembly, camshaft, adjusting arm, etc.

(2) Disc brake

The brake uses the end face of the disc as the contact surface of the friction pair, including the brake disc, brake caliper assembly, etc.

8. Hub assembly

The rotating components that connect the wheel and axle body and mainly bear the load between the wheel and axle body can be composed of hub, bearing, oil seal, axle head nut, end cap, etc.

9. Main assembly technical parameters of trailer axle