First-Generation Ball Bearing Hub Unit

Overview

First-generation ball bearing hub units are early designs in automotive wheel hub bearings, primarily using double-row angular contact ball bearings or double-row cone roller bearings. They support wheel rotation and transmit loads but have been phased out due to structural simplicity and assembly complexity.

Structural Composition

1. Key Components - Inner race: Press-fitted into the hub,承受 rotational loads. - Outer race: Press-fitted into the knuckle, fixing the bearing position. - Steel balls: Reduce friction (Subaru Impreza uses cone roller bearings for higher load capacity). - Cage: Guides steel balls evenly. - Seal: Partially integrated, with limited performance.
2. Assembly Method Inner race pressed into the hub, outer race into the knuckle, no integrated flange. Low assembly precision and time-consuming.

Typical Applications

• Suitable models: Santana 2000, Chery QQ, Jetta, Passat B5, Mazda, Renault, Peugeot, Volkswagen Golf, Toyota RAV4, etc.
• Limitations: - No ABS sensor integration. - No maintenance-free design, requiring regular adjustments.

Advantages and Disadvantages

Advantages	Disadvantages
Simple structure, low cost	Complex assembly, inconsistent performance
Suited for low-load scenarios	Poor sealing, dust/water susceptible
Widespread compatibility	High maintenance, short lifespan

Market Status and Trends

Current Situation

• Low market share, used in low-end vehicles or repairs.
• Domestic manufacturers transition to later generations; foreign suppliers phased them out.

Replacement Reasons

• Assembly efficiency: Second-generation bearings simplify installation with flanges.
• Performance: Third-generation integrates ABS sensors for智能化.
• Lightweighting: Later generations reduce weight by 180-300g for新能源 vehicles.

Case Studies

• Santana 2000: Double-row cone roller bearings with regular adjustments.
• Chery QQ: Upgraded from first- to second-generation bearings.