A Measuring Method of Negative Clearance of Hub Bearing Unit

Abstract

The invention provides a method for measuring the negative clearance of a hub bearing unit, which includes the following steps: S1: feeding the small circle of the workpiece upwards onto the operating platform of the positive clearance workpiece; S2: clamping the outer flange of the workpiece, and the small circle is subjected to the lower The top spring is pressed against, and the workpiece is moved upwards away from the work table with positive clearance, and the measurement data is a0; S3: the inner flange is lifted to a proper position; S4: the rotating mechanism drives the inner and outer flanges of the workpiece to rotate relative to each other for 1‑3 circles, and the measurement data is a0. The data is a1, and a1-a0 is the positive clearance value Ga; S5: Transfer the workpiece to the negative clearance workpiece operating platform; S6: Lift the workpiece to the upper surface of the workpiece and contact the negative clearance upper tooling, and measure the data is b0; S7: continue to lift the workpiece to b1, b0-b1 is the axial displacement L of the small circle, the displacement L is Ga+d, and d is the negative clearance value, if L <ga，则更换小圈，如果l>Ga, the workpiece is discharged as qualified, and the above steps S1-S7 are repeated. The invention provides a measuring method with high degree of automation and capable of accurately measuring the positive clearance value of the bearing.< / ga，则更换小圈，如果l>

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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