Rear Axle Wheel Hub Assembly (or Hub Unit) for Heavy-Duty Trucks

1. Product Positioning & Application

• Applicable Models: Mainly matches heavy-duty trucks from Sinotruk (Howo, SITRAK), Shaanxi Automobile (Delong, Aolong), FAW Jiefang (J6, J7), Foton Auman, and other brands. Also compatible with the rear axle (drive axle or non-drive axle) systems of other domestic heavy-duty trucks.

2. Appearance & Structural Features

• Material: The hub body is typically made of high-strength cast iron (or cast steel). The flange and mounting surfaces may be made of alloy steel or heat-treated, offering high rigidity, impact resistance, and wear resistance, suitable for heavy loads and complex road conditions (e.g., rough terrain, mud, heavy-load climbing).

• Structure:

  • Hub Body: Disc-shaped, with a central bore (to mate with the axle shaft or axle tube) and an outer mounting surface (for wheel bolts; multiple bolt holes are visible in the image).

  • Flange: The raised circular disc on the outer side of the hub, with bolt holes (the gold bolts on the right are matching mounting bolts) for securing the wheel.

  • Bearing Housing / Oil Seal Cavity: The inner cavity of the hub (black area in the image) houses tapered roller bearings and an oil seal, enabling wheel rotation support and sealing.

  • Reinforcement Structure: Some hubs feature internal ribs (raised stripes in the black area) to increase strength and deformation resistance, reducing unbalanced vibration during high-speed rotation.

  • Mounting Bolts: The gold bolts on the right are hub mounting bolts, typically made of high-strength alloy steel with anti-loosening features (e.g., washers, thread-locking compound) to ensure reliable wheel-to-hub connection.

3. Usage & Maintenance Tips

• Replacement Interval: Affected by load, road conditions, and corrosion. Generally recommended to inspect every 100,000–150,000 km. Replacement is needed when cracks, deformation, or excessive bearing seat wear are found.

• Compatibility: Different truck models (e.g., Sinotruk Howo T7H, Shaanxi Automobile Delong X3000) have varying rear axle hub flange bolt patterns, axle tube inner diameters, and bearing specifications. Strict selection according to vehicle/axle model is required to avoid wheel looseness, oil leakage, or driveline failure.

• Maintenance Tips: Apply anti-rust grease during installation, use a torque wrench to tighten bolts to specified torque. Regularly check for oil seal leakage or bearing noise. Timely maintenance can extend hub service life.

Summary

This is a rear axle wheel hub assembly for heavy-duty trucks. It is a core component for carrying wheels, transmitting power (drive axle), or supporting wheels (non-drive axle). It must offer high strength, wear resistance, and impact resistance to ensure driving safety and reliability under heavy loads and complex road conditions. The product shown in the image is a hub assembly with mounting bolts, in storage or ready for shipment, with proper packaging, suitable for precise aftermarket replacement.