Three-point measurement method for negative clearance of third-generation hub bearing unit
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A three-point measurement and hub bearing technology, applied in the field of bearings, can solve problems such as the difficulty of directly measuring the negative clearance value of the third-generation hub bearing unit, and achieve the effects of fast measurement speed, accurate measurement results and high efficiency
Inactive Publication Date: 2017-03-22
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) Sequentially apply force to the upper and lower ends of the flange of the outer ring 3, so that the outer ring 3 can move up and down along the axial direction, install a displacement measuring instrument o...
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) Sequentially apply forces at the upper and lower ends of the flange of the outer ring 3, so that the outer ring 3 can move up and down along the axial direction, and three displacement measuring instruments...
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Abstract
The invention discloses a three-point measurement method for negative clearance of a third-generation hub bearing unit. The three-point measurement method comprises the steps of: 1) assembling; 2) sleeving a small end surface of a first inner ring on a shaft at the upper end of a second inner ring downwardly, carrying out pre-pressing by applying downward pressure F1 to a large end surface of the first inner ring, so that 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) applying a force to a flange plate of an outer ring in a sequence from the upper end to the lower end or from the lower end to the upper end, and measuring a positive clearance value Ga by adopting the three-point measurement method; 4) applying downward pressure F2 to the first inner ring, so that the small end surface of the first inner ring is in contact with the shaft shoulder of the second inner ring; 5) and measuring displacement L of the first inner ring moving along the axial direction, if Ga<L, indicating that a negative clearance value equals to Ga-L, and if Ga>L, replacing the first inner ring, and repeating the steps from 1) to 4). The three-point measurement method can be used for measuring the negative clearance value of the third-generation hub bearing unit directly, is simple and convenient in operation, fast in measuring speed, high in efficiency as well as precise and reliable in measurement results, can ensure the quality of subsequent press-fitting products, and satisfies requirement for consistency in production.
Description
technical field [0001] The invention belongs to the technical field of bearings, and in particular relates to a three-point measurement method for the negative clearance of a third-generation wheel hub bearing unit. 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 ...
Claims
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