Everyone calls the bearings on bicycles Peilin. In fact, Peilin is also a foreign word. The professional name is deep groove ball bearing. Basically, deep groove ball bearing is the most commonly used one on bicycles now. I also saw that netizens mentioned a kind of thrust bearing, which is actually an angular contact bearing. At present, bicycles are rarely used, mainly because of the price.
At present, the following types of bearings are used on bicycles:
1: High grade: ceramic ball hybrid bearing. The steel ball is made of ceramic ball (Si3N4), but the inner and outer rings are made of stainless steel. The domestic brand is 9Cr18, and the international brand is SUS440C. Advantages: flexible rotation, high speed and durability; Disadvantages: The bearing groove is easy to scratch and expensive.
2: Medium and high-end: stainless steel bearings, stainless steel flange bearings. The difference between these bearings and the above is that the steel balls inside are made of stainless steel, and the material is the same as that of the rings. Advantages: durable, flexible rotation, much cheaper than ceramic ball bearings; Disadvantages: Not found yet, hehe.
3: Low end: bearing steel bearing, material GCr15, international brand 52100. Advantages: cheap; Disadvantages: Not durable.
4: Heavy load bearing: full ball bearing, that is, there is no bearing retainer inside the bearing, all of which are steel balls. Advantages: can be overloaded; Disadvantages: slow speed, unable to bear high speed.
In fact, the real high-end bicycles do not use bearings (of course, this is not absolute), because when starting or accelerating rapidly, once the bearing is subjected to a great force, the bearing will have a certain plastic deformation, which reflects that the driver's feeling is "cluck", and there will be a feeling of unsmooth. However, my customer told me what to use earlier and forgot. I hope that any driver will tell me when they know.
However, today's major bearing factories are all good imported grease, with the price of 6000 or 7000 yuan per barrel, such as Kyodo Yushi in Japan and Mobil in the United States (the price is cheaper). The high-end ones will use some DuPont grease or Krupp grease, with the price generally around 15000 yuan. In fact, it is difficult for ordinary people to distinguish between good and bad by oil. We common people have a misconception that high bearing accuracy is actually what we call basic accuracy, that is, bearing diameter, outer diameter and width. And the control of this size is generally good, because domestic factories are 100% tested, which is to say, picked out.
The quality of the real bearing depends on the design and processing technology of the bearing, and the standard to measure the quality depends on the five rotating precision of the bearing, which is very critical.