Steel ball special for third-age hub bearing for luxury cars

A wheel hub bearing and car technology, applied in the field of steel balls for bearings, to achieve the effect of large hardness drop, large material loss, and large ring belt

Active Publication Date: 2011-11-23
JIANGSU LIXING GENERAL STEEL BALL
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Problems solved by technology

Makes car maintenance easier

Method used

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Embodiment Construction

[0014] Car wheel hub unit bearing steel ball is an important part of the bearing. The quality of the steel ball is very important to the accuracy, dynamic performance and service life of the ball bearing. A large number of bearings are used. The test shows that the steel ball affects 70% of all factors of the bearing. %, the proportion of bearing failure due to steel ball rupture accounts for 58.8%, which shows the important position and importance of steel balls in bearings, so the quality of steel balls is an important indicator to measure the quality of ball bearings. Its performance index: the precision level must reach G5 level, and the most important thing is that it involves the reliability and safety of the whole vehicle. Therefore, the special steel ball for the third generation of car wheel has higher performance requirements. The raw material used for the "ball" must be GCr15 bearing steel with high life, high precision and high purity for automobiles. The oxygen con...

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Abstract

The invention discloses a steel ball special for a third-age hub bearing for luxury cars, which is characterized by having the roundness of 0.13mum, the hardness of 64-64.5HRC, the single-grain hardness grain difference of 0.5HRC, the group hardness difference of 0.8HRC, the residual austenite of 8-12%, the stress of 800-1200Mpa, the half amplitude of 75-200Mpa, the strengthening layer thickness of 0.8-1.2mm and the metallographic structure of 2-3 level; the steel ball of the bearing is quenched by using an incomplete quenching process, 99.5% N2 is necessarily used as the protective atmosphere of a quenching and tempering technology during controllable atmosphere heat quenching treatment, the cold treatment is carried out immediately after quenching: after the steel ball restores room temperature after cold treatment, immediately performing a first tempering phase; and additionally providing a second tempering process after a grinding process. The invention has the advantages that: steel balls made of new material is adopted to prolong the service life of the steel balls; and in the ball blank forming process, the material consumption and the production cost are reduced.

Description

technical field [0001] The invention relates to a steel ball for bearings, in particular to a special steel ball for third-generation hub bearings used in high-end cars. Background technique [0002] The hub bearing is a very important part in the car. The traditional car wheel bearing is composed of two sets of tapered roller bearings or ball bearings. It bears the important task of reducing the frictional resistance when the chassis is running and maintaining the normal driving of the car. If the wheel hub bearing fails, it may cause noise, bearing heating, etc., especially the front wheel is more obvious, which may easily lead to dangerous phenomena such as loss of direction control. Therefore, hub bearings must be maintained on schedule. [0003] With the continuous development and progress of the automobile industry, people have higher and higher requirements for the performance of automobiles, and higher and higher stability, safety and reliability of automobiles. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/32B23P15/00C21D1/18C21D1/74
CPCY02P10/20
Inventor 周勇马林沙小建卢卫金吴桂松苏银建
Owner JIANGSU LIXING GENERAL STEEL BALL
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