The bearing can be decomposed into such parts as the inner ring, the outer ring, the cage, the steel ball, and the dust-proof sheet. Bearings can also be used in these aspects. (Strictly speaking, bearings should be applied, not just good or bad). The inner and outer rings are generally made of carbon steel or bearing steel, and the holding frame is made of plastic or iron. The steel ball is divided into carbon steel, bearing steel, ceramic ball, and the dust-proof sheet has white iron or rubber. Another important concept of bearings is "play" - the gap between the ball and the channel. Below I explain from the various aspects mentioned above what kind of bearings are most suitable for use on skates.
1, from the perspective of the inner and outer ring, the use of bearing steel is better than the use of carbon steel, because one is the accuracy of carbon steel bearing steel is not good, there is a carbon steel is more brittle than the bearing steel, skate bearing The force is radial. Generally there is a radial force of 100--150 kilograms in the jumping process. It is easy to crack with carbon steel.
2. From the perspective of steel balls, bearing steel is better than carbon steel, and ceramic balls are better than bearing steel. The basis for this is carbon steel brittleness. In addition, when the bearing is subjected to force rotation, the channel will generate high heat, and the surface wear of the steel will be very severe. If ceramic balls are used, heat generation can be minimized. In addition, the ceramic ball bearing does not use grease lubrication, the surface smoothness is extremely high, most conducive to the rapid start.
3, from the perspective of the cage, plastic lubrication is better than iron, but the firmness of iron is better than that of plastic, but for skate bearings, plastic is generally better than iron because of the lightness of plastic. The ball bearings of the skates are also small, and the plastic cage is strong enough.
4. From the viewpoint of the dust-proof film, the tin-metal dust-proof sheet is divided into a live lid and a dead lid, which can be maintained by the user himself. The dead lid cannot be maintained, and the grease cannot be replaced.
In the end, the clearance, if the game of the skate bearing is too big, the smoothness of the bearing is poor. If it is too small, the starting torque should be increased, so this play should be just right.
In summary, there is a type of bearing that is most suitable for skate bearings: inner and outer rings are bearing steel, steel balls are ceramic balls, plastic cages, dust caps with dead lids, and bearings with proper clearance. However, the high price of such bearings is generally 18 to 25 yuan (ceramic balls are divided into white pottery and black pottery, white pottery is relatively cheaper). In the market, 150-200 yuan of ice-skating shoes are generally used between 0.5-1.5 yuan.
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