Method for measuring negative clearance of hub bearing unit

Abstract

The invention provides a method for measuring the negative clearance of a hub bearing unit. The method comprises the following steps that S1, a workpiece small ring is fed upwards into a positive-clearance workpiece operation table; S2, an outer flange of the workpiece is clamped, the small ring is pushed by the lower-push spring, the workpiece is moved upwards away from the positive-clearance workpiece operation table, and a measured data is a0; S3, an inner flange is jacked to an appropriate position; S4, a rotating mechanism drives the inner flange and the outer flange of the workpiece to rotate for 1-3 cycles, a measured data is a1, and a1 minus a0 is a positive clearance value Ga; S5, the workpiece is conveyed to a negative-clearance workpiece operation table; S6, the workpiece is jacked till the upper surface of the workpiece is in contact with a negative-clearance upper tool, and a measured data is b0; and S7, the workpiece is continuously jacked upwards to the position b1, b0 minus b1 equals the axial displacement L of the small ring, the displacement L is Ga plus d, d is a negative-clearance value, if L is less than Ga, the small ring is replaced, and if L is larger than Ga, the workpiece is qualified and discharged, and the steps S1 to S7 are repeated. The method is high in automation degree and capable of accurately measuring the positive clearance value of the bearing.

Description

technical field [0001] The invention relates to a method for measuring the negative clearance of a hub bearing unit, belonging to the technical field of bearings. Background technique [0002] The detection of the assembly quality of the wheel hub bearing unit is an important link in the detection of the safety performance and stability of the motor vehicle. The press-fitting accuracy of the negative clearance of the wheel hub bearing balls will affect the assembly quality of the wheel hub bearing. Under the loaded state, it is easy to loose and form vibration, which will affect the performance of the hub unit; when the negative clearance value is too large, the friction between the ball and the raceway will be too large when the bearing rotates, which will easily cause early fatigue and affect the service life of the hub bearing. [0003] The existing technology usually uses manufacturing experience to apply axial pressure to the hub bearing unit for press fitting, but this...

AI Technical Summary

Problems solved by technology

[0002] The detection of the assembly quality of the wheel hub bearing unit is an important link in the detection of the safety performance and stability of the motor vehicle. The press-fitting accuracy of the negative clearance of the wheel hub bearing balls will affect the assembly quality of the wheel hub bearing. Under the loaded state, it is easy to loose and form vibration, which will affect the performance of the hub unit; when the negative clearance value is too large, the friction between the ball and the raceway will be too large when the bearing rotates, which will easily cause early fatigue and affect the service life of the hub bearing.

[0003] The existing technology usually uses manufacturing experience to apply axial pressure to the hub bearing unit for press fitting, but this method does not press the actual clearance of the hub bearing as the basis for press fitting, so that the negative clearance of the hub bearing produced may be too large or The negative clearance value is not enough, and the defective products in the production process cannot be screened out. Therefore, it is necessary to design a method that accurately measures the positive clearance value of the bearing and transmits it to the press-fitting mechanism in real time for press-fitting

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