Motorcycle on the various parts of the use of many bearings, such as the direction column, before and after the hub, after the chain plate, the engine in the bearing, is precision parts. The bearings produced by regular manufacturers are generally tested as qualified products when they leave the factory, but the market is full of many inferior bearings, which leads to many motorcycles after replacing the bearings. It doesn't take long, the bearings are broken again, especially in the middle of the road, which brings great pain and inconvenience to the owners. So the bearing must use qualified products, but also to get the correct installation.
Commonly used cheating means of inferior bearings:
1 with iron, carbon steel production manufacturing bearings, or repair scrap bearings. The front one will bring the hardness of the bearing is not enough, and the back one will bring the accuracy of the bearing is insufficient.
2. The inferior bearings and bearings of small factories are marked with the trademarks of big factories, and the internal and external packaging boxes and certificates of the products of big brands are imitated.
3. Fake famous brand users, dealers, agents, and even counterfeiting manufacturers spot sales department.
4. Use defective bearings to pass off as official genuine bearings.
5. Use ordinary bearings as high precision bearings.
6. Official and fake products are mixed in for sale.
7. Fake goods sell at official price, official genuine goods sell at high price, apply fake price.
8. If you want a cheap one, give a fake one. If you want a good one, give a real one.
Six ways to distinguish true and false bearings:
1. Is the outer packing box clear? In general, the factory brand has its own special designers for external packaging box design, and arrange the production conditions pass the factory to complete the production, so the packaging from the line to the color block are particularly clear, no ambiguity.
2. See whether the certificate of qualification is standard. For example, there is a watermark in the tile certificate, and there is still "ZWZ" in the watermark; There are anti-counterfeiting mark number on the certificate of Luo axis.
3. Is the steel print clear? Brand words and labels will be printed on the bearing body. The font is very small, but most of the factory produced by the application of steel printing technology, and before the completion of the pressure without overheating treatment, so although the font is small, but deep concave, particularly clear. And the fake products of the font not only blurred, because the printing technology is rough, the font floating on the surface, some even easily can be erased by hand.
For example, the steel mark on the NSK bearing has no tactile feeling if it is touched by hand, but if it is scraped with a fingernail at once, it can feel the existence of the steel mark, and imitate the bearing, the steel mark is either protruding or concave.
4. Look at the overall condition of the bearing. First, look at the appearance of the quality, is there a processing quality is poor, round runout obvious; Whether there are muddy oil traces, domestic bearings have obvious oil traces and the taste of antirust oil, the original imported bearings are almost unable to see the traces of antirust oil; Is the product genuine? There are obvious specifications and models such as CAK's inner hole without cone shape and 2RS's only unilateral seal.
5. Look at the metallic sheen. Bearing chamfering will not be polished after heat treatment. The official chamfer is very smooth and has a gray metallic luster, while the fake one is either not smooth or the color is not gray metallic luster.
6. Listen for sounds. Hold the bearing body around the sleeve, the right hand toggle the coat to rotate it, listen to the sound is not noise. Fake and shoddy products are inevitably mixed with sand and other impurities in the production process, so the rotation will emit a noise, which is the biggest difference between the official products and strict compliance with production standards.
Of course, it is also important to install and use it correctly. In the process of motorcycle use, if the bearing ball cage falls off, the working face in the rolling groove appears unconventional wear, peeling and rotation stagnation phenomenon, more problems belong to the use and installation of bearings.
Motorcycle rear wheel bearing, the load is large, if often overloaded, coupled with the high salt content of rain road driving, easy to cause wear, affect the service life. Therefore, do not wait for the bearing to go out of the outer edge to replace, it will be too late. After replacing the hub bearing, do not force into it. If it is summer, the bearing can be placed in the refrigerator for a period of time, and then it will be better to install it. The upper and lower bearings of the directional column, due to the failure of the front shock absorption, insufficient lubrication or the upper and lower fastening strength is not suitable, cause the ball breaking or peeling off the ball working surface, forming the direction to turn astringent or deviation, affecting the safety of driving. When changing the direction bearing, be sure to check whether the front shock absorption is good. If it is broken, it is also necessary to repair or replace it, otherwise, the direction bearing is easy to break.
Bearing on the front and rear wheel and the chain plate, due to the owner in daily use, wading too deep or often wash the car, let the water enter the bearing, the grease in the bearing failure, gradually form rolling groove inside the bearing and ball bearing wear serious, clearance increases obviously, if the factory or sales before and after the wheel assembly too tight or too loose, over time, causing the instability of driving bearing binding or bearing displacement kuang, ball cage of damage or loss, the formation of clearance is too large, the brake discs and wheel friction increases the driving resistance, after the bearing on the sprocket rim, water or adjust too close too loose, easily cause damage, So the owners in the car wash or deep pit should pay special attention to timely inspection and maintenance. If the damaged replacement must be in place, adjust to the wheel rotation flexible, no obvious clearance shall prevail.
Through the above analysis: bearing damage is mainly caused by poor lubrication, installation is not in place, improper clearance fit and poor use environment and other factors, if not early detection or repair, it will cause great losses or affect driving safety. Therefore, manufacturers, dealers, maintenance industry and car owners should pay attention to avoid such accidents.