Rear Axle Housing Assembly for HOWO 8×4 Heavy-Duty Truck – A core component of the chassis transmission system, used to mount the rear axle reducer, differential, axle shafts, etc. It serves as the "skeleton" of the rear axle, supporting the axle and transmitting power.

Detailed Analysis:

1. Product Positioning & Application

• Applicable Models: Specifically designed for the Sinotruk HOWO 8×4 (front four rear eight) heavy-duty truck, matching its drive axle (rear axle). It bears the weight of the rear portion of the vehicle (including cargo and body) and transmits power from the transmission to the drive wheels.

• Function:

  • Structural Support: As the rear axle housing, it houses and protects internal components such as the reducer assembly (main reducer, differential), axle shafts, and bearings, preventing dust and mud ingress.

  • Load Bearing: Withstands vertical loads under full vehicle load (cargo, body, passengers) as well as impact loads during operation (e.g., bumps, lateral forces during cornering).

2. Appearance & Structural Features

• Material:

  • Axle Housing Body: Made of high-strength cast steel (e.g., ZG270-500) or welded steel plate (some lightweight designs). Processed via casting/welding and heat treatment, offering high rigidity, torsional strength, and wear resistance, suitable for heavy loads and complex road conditions.

  • Attachments (Flanges, Oil Seal Seats, Breathers): Flanges are forged or cast steel; oil seal seats are cast iron or steel, ensuring sealing and connection strength.

• Structure:

  • Axle Housing Body: Shaped as a "trapezoidal" or "U-shaped" cavity structure (appears as a split or integral housing in the image). Both ends feature axle shaft tubes (or flanges) for mounting the axle shafts, wheels, and connecting the brake drum (disc/drum brake).

  • Internal Cavity: Houses the main reducer and differential assembly. Gear oil is added through an oil sump (or fill port) to lubricate internal gears.

• Assembly Condition: The image shows a complete rear axle housing assembly (including housing body, axle shaft tubes, mounting brackets, oil seal seats, etc.). Some axle housings may include a breather valve (to equalize internal and external pressure) and a drain plug (for draining old oil).