Hub unit and assembling installation method thereof

Abstract

The invention discloses a hub unit and an assembling installation method thereof. The hub unit is rotationally installed on a steering knuckle or a vehicle axle tube. The steering knuckle or the vehicle axle tube is in clearance fit with inner rings of two bearings. A plastic deformation spacer bush is arranged in a hub body. The assembling installation method of the hub unit mainly includes the steps that the inner ring of the second bearing is supported on a carrying piece, a press machine is used for applying pressure T1 to the outer end face of the inner ring of the first bearing, the plastic deformation spacer bush generates plastic deformation, the pressure is reduced to T2, the initial rotation torque of the hub unit is detected, when the initial rotation torque is in a preset rangevalue, a product is qualified, and the set range of the initial rotation torque is matched with the set range of a bearing clearance of the hub unit; and the steering knuckle or the vehicle axle tubeis sleeved with the hub unit integrally, and a spindle nose nut is screwed tightly through set fastening torque corresponding to the pressure T2. The bearing clearance is in a reasonable range all the time, the service life of the hub unit is prolonged, and the manufacturing cost can be reduced as well.

Description

technical field [0001] The invention belongs to the technical field of auto parts, and in particular relates to a wheel hub unit and an assembly and installation method thereof. Background technique [0002] At present, trucks on the market have a high maintenance frequency, which needs to be maintained every 30,000 to 50,000 kilometers. The high maintenance frequency and the long stop time of the vehicle cause great economic pressure on the owner. With the development of the automobile manufacturing industry, the requirements for wheel end products are getting higher and higher. At present, many main engine manufacturers have put forward the goal of 500,000 kilometers of maintenance-free. Meet customer and market needs. [0003] The proper working clearance of the bearing during the driving of the car can improve the service life of the wheel end. The traditional way to adjust the bearing clearance of the wheel end is to first lock the axle nut to reach the rated pretighte...

AI Technical Summary

Problems solved by technology

This kind of bearing clearance adjustment method is complex in process, cumbersome in operation steps, prone to human error, difficult to guarantee the accuracy of bearing clearance, and reduces the service life of bearings, thereby shortening the service life of the wheel hub assembly

In addition, existing bearings have an interference fit with the steering knuckle or the axle tube of the vehicle. Under severe road conditions, the bearing rollers are often squeezed to death and unable to roll normally, and even the outer ring of the bearing will rotate, causing the bearing chamber to wear and the bearing It fails with the wheel hub; and the bearing has an interference fit with the steering knuckle or the vehicle axle tube. During the installation process, the customer needs to spend a lot of effort to install the wheel hub assembly on the steering knuckle or the vehicle axle tube. The installation is difficult and the installation cost is high. At the same time In terms of vehicle maintenance, it will also cause maintenance difficulties and high maintenance costs.

[0004] Some commercial vehicles set a rigid spacer between the two bearings of the hub unit, and use the high-precision rigid spacer to produce small elastic deformation to achieve the purpose of adjusting the bearing clearance of the hub unit. Therefore, the tolerance of the dimensional chain must be strictly controlled during the processing , high processing and manufacturing costs, one-to-one measurement and matching of the hub unit is required in product assembly, the process is complicated, and the assembly cost is high

While the hub unit is subjected to impact loads during vehicle operation, the two bearings and the rigid spacer will wear out as the running time increases. When a certain degree of wear is reached, the rigid spacer loses its function of adjusting the bearing clearance, shortening the service life of the hub unit

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