TB-056 HELMET
Summary description:
1、 From the perspective of the cage, the lubrication of plastic is better than that of iron, but the firmness of iron is better than that of plastic. However, for roller skate bearings, plastic is generally better than iron because plastic is light and the steel balls of roller skate bearings are also small, making the plastic cage strong enough.
Detailed introduction
1、 From the perspective of the cage, the lubrication of plastic is better than that of iron, but the firmness of iron is better than that of plastic. However, for roller skate bearings, plastic is generally better than iron because plastic is light and the steel balls of roller skate bearings are also small, making the plastic cage strong enough.
2、 From the perspective of the inner and outer rings, those using bearing steel are better than those using carbon steel, because one is that the processing accuracy of carbon steel is not as good as that of bearing steel, and the other is that carbon steel is more brittle than bearing steel. The force on roller skate bearings is radial, and there is usually a radial force of 100-150 kilograms during the jumping process. Carbon steel is prone to cracking and damage.
3、 From the perspective of steel balls, bearing steel is better than carbon steel, and ceramic balls are better than bearing steel. The basis for saying this is that carbon steel is brittle, and in addition, during the process of bearing rotation under force, the groove will generate high heat, and the surface of the steel will wear severely. If ceramic balls are used, the generation of heat can be greatly reduced. In addition, ceramic ball bearings do not require grease lubrication, and their surface smoothness is extremely high, which is most conducive to rapid start-up.
4、 Skating shoe bearing clearance. If the skating shoe bearing is too large, the smoothness of the bearing will be poor. If it is too small, the starting torque will also increase, so this clearance should be just right.
5、 From the perspective of the dust cover, the white iron sheet dust cover can be divided into a movable cover and a dead cover. The movable cover can be maintained by users themselves, while the dead cover cannot be maintained. If the grease runs out, it needs to be replaced.
Key words:
TB-059 HELMET
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