因为大批量生产这种方式决定了球轴承和滚子轴承不但质量高，而且价格低，因

Because this method of mass production determines that ball bearings and roller bearings are not only of high quality, but also low in price, the task of machine designers is to select rather than design bearings. Rolling bearings are usually made of steel with a hardness of about 900 HV, which is integrally hardened. Rolling bearings will produce high stress during operation, and the main failure mode is metal fatigue. At present, people are carrying out a lot of research work in order to improve the reliability of this kind of bearing. Bearing design is based on the life value that can be accepted by people. In the bearing industry, the bearing capacity of the bearing is usually defined as such a value, that is, when the load is less than this value, 90% of the bearings in the batch will have a life of more than one million revolutions.

Because mass production determines that ball bearings and roller bearings are not only of high quality, but also of low price, the task of machine designers is to select rather than design bearings. Rolling bearings are usually made of integrally quenched steel with a hardness of about 900 HV. The main failure form of rolling bearing is metal fatigue because it will produce high stress in work. At present, a lot of research work is being carried out to improve the reliability of this bearing. Bearing design is based on the life value that can be accepted by people. In the bearing industry, the bearing capacity of bearings is usually defined as such a value, that is, when the load borne is less than this value, 90% of the bearings in the - batch will have a service life of more than one million revolutions.<br>

Because mass production determines that ball bearings and roller bearings are not only of high quality, but also of low price, the task of machine designers is to select rather than design bearings. Rolling bearings are usually made of steel with a hardness of about 900 HV and quenched as a whole. The main failure form of rolling bearing is metal fatigue because of the high stress in operation. At present, people are doing a lot of research work in order to improve the reliability of this kind of bearing. Bearing design is based on acceptable life value. In the bearing industry, the bearing capacity of bearings is usually defined as such a value, that is, when the load borne is less than this value, 90% of the bearings in a batch will have a life of over one million revolutions.