Negative clearance rotation measurement method for third-generation hub bearing unit
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A rotary measurement and wheel bearing technology, applied in the field of bearings, can solve the problem of difficulty in directly measuring the negative clearance value of the third-generation wheel hub bearing unit, and achieve the effect of fast measurement speed, product quality assurance, and accurate measurement results.
Inactive Publication Date: 2017-03-15
CHONGQING CHANGJIANG BEARING
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Problems solved by technology
Since the third-generation hub bearing unit is integral, it is difficult to directly measure the negative clearance value of the third-generation hub bearing unit on the finished product
Method used
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Embodiment 1
[0018] Such as figure 1 , figure 2 As shown, after the components of the above-mentioned third-generation hub bearing unit are prepared, the negative clearance measurement method includes the following steps:
[0019] 1) First assemble the first inner ring 1, the second inner ring 2, the outer ring 3, the steel ball 4 and the cage together.
[0020] 2) Next, put the small end of the first inner ring 1 downward on the shaft at the upper end of the second inner ring 2, press the second inner ring 2 to fix it, and apply a downward force on the large end of the first inner ring 1. The pressure F1 is preloaded so that the small end surface of the first inner ring 1 and the shoulder of the second inner ring 2 maintain a distance a, and the value of a is 0.1-0.15mm.
[0021] 3) Control the first inner ring 1 and the second inner ring 2 to rotate synchronously, and the speed is not more than 150 rpm, and apply force sequentially on the upper and lower ends of the outer ring 3 flang...
Embodiment 2
[0026] Such as figure 1 , figure 2 As shown, after the components of the above-mentioned third-generation hub bearing unit are prepared, the negative clearance measurement method includes the following steps:
[0027] 1) First assemble the first inner ring 1, the second inner ring 2, the outer ring 3, the steel ball 4 and the cage together.
[0028] 2) Next, put the small end of the first inner ring 1 downward on the shaft at the upper end of the second inner ring 2, press the second inner ring 2 to fix it, and apply a downward force on the large end of the first inner ring 1. The pressure F1 is preloaded so that the small end surface of the first inner ring 1 and the shoulder of the second inner ring 2 maintain a distance a, and the value of a is 0.1-0.15mm.
[0029] 3) Control the first inner ring 1 and the second inner ring 2 to rotate synchronously, and the speed is not more than 150 rpm, and apply force sequentially on the upper and lower ends of the outer ring 3 flang...
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Abstract
The invention discloses a negative clearance rotation measurement method for a third-generation hub bearing unit. The method includes the following steps that: 1) various components are assembled; 2) a first inner ring is embedded into a shaft on the upper end of a second inner ring, a downward pressing force F1 is applied to the first inner ring so as to carry out pre-pressing, and a distance a is kept between the small end surface of the first inner ring and the shaft shoulder of the second inner ring; 3) the two inner rings are controlled to rotate, and a three-point measurement method is adopted to measure a positive clearance value Ga; 4) a downward pressing force F2 is applied to the first inner ring so as to make the small end surface of the first inner ring contact with the shaft shoulder of the second inner ring; and 5) the displacement L of the first inner ring along an axial direction is measured, and if Ga is smaller than L, a negative clearance value is equal to the result of subtracting L from Ga, if Ga is larger than L, the first inner ring is replaced, and the above 1) to 4) step are repeated. With the negative clearance rotation measurement method of the invention adopted, the negative clearance value of the third-generation hub bearing unit can be directly measured. The negative clearance rotation measurement method has the advantages of simple and convenient operation, high measurement speed, high efficiency and accurate and reliable measurement results, and can ensure product quality in subsequent press and can satisfy a requirement for consistent production.
Description
technical field [0001] The invention belongs to the technical field of bearings, and in particular relates to a third-generation wheel hub bearing unit negative clearance rotation measurement method. Background technique [0002] The third-generation hub bearing unit generally consists of an outer ring, a first inner ring, a second inner ring, a cage, steel balls, etc. There are two raceways on the inner wall of the outer ring, each raceway corresponds to an inner ring, and the two inner rings are separated, and a set of steel balls are installed between each inner ring and the outer ring, and the steel balls are held by the cage position. Theoretically, the axial clearance of the third-generation hub bearing is controlled at an appropriate negative value, which can maximize the fatigue life of the bearing, improve the rotation accuracy and positioning accuracy of the bearing, and suppress vibration and noise. Since the third-generation hub bearing unit is integral, it is ...
Claims
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