What is bearing clearance? From a professional point of view, the clearance is the total distance that a bearing ring can move in the radial (radial clearance) or axial (axial clearance) with respect to another bearing ring, that is, in bearings. Clearance between rotor and roller. To talk about people, well, from the driver's point of view, can be simply understood as the tightness of the bearing installation. The tighter the bearing installation is, the smaller the clearance is and the larger the clearance is, the larger the installation is. Tapered bearings can not be called clearance before they are assembled. They are usually called seat heights. What about the tightness of the installation? Knowledge points! The size of the clearance is directly related to the condition and life of the bearing. Xiao Bian understands that maintaining the clearance of the bearing within a reasonable range can bring about two benefits to the driver: first, it can extend the life of the bearing, and secondly, it can reduce or even avoid the number of times the driver usually maintains the bearing ( Maintenance-free) to reduce operating costs. How? Very practical! New skills get. That Xiao Bian will ask a very serious topic? If the bearing clearance of the truck is not kept within a reasonable range, it will have an impact on the operation of the vehicle. Is this also what you want to ask? Xiaobian understand! Look directly at the picture below! Case 1: Adjustment is too tight, that is, exceeds the prescribed negative clearance, reaching the left gray area, will lead to poor lubrication of the bearing, wear will be very serious, so that the hub bearing deformation is not smooth and the bearing life will be With a sharp drop, serious wheel locks or tires fall off; Knowledge points: too tight bearing life is short or wheel lock or tire off! Case 2: Adjustment is too loose, exceeds the limit value, reaches the right gray area, bearing life will also decline, in addition, the tire will appear swing phenomenon, in the process of transportation instability, abnormal wear and loose parts may also be possible Causes the tire to fall off. Knowledge points: too loose will tire swing or tire fall off The red area is the best range of bearing clearance Seeing this, we should know the importance of bearing clearance, let's not be a game! Another important thing is that even if you use a high-grade bearing when buying a car, you may have problems with the maintenance of the wheel! Most of our domestic hubs are forcibly disassembled due to product design during the maintenance process. The working condition of the hub largely depends on the assembly level of maintenance personnel. This will also directly affect the size of the bearing clearance, leaving us with security risks for the car's operation. Why is the swelling broken? Don't worry, Xiao Bian has heard a kind of "dark magic"! Kang Mai is possessing this kind of "dark magic"! How did Combe's "dark magic" show up? And look at the first step, and it is a very critical step: After the assembly of Conley's wheels on the production line, there will be a testing process before going offline, and the torque in the actual operation will be simulated through professional equipment. Then through the sensor, the actual clearance value of the product will be measured, and all the manufactured products will be guaranteed. The clearance value of 100% meets the design criteria. After these several processes, the product has realized Plug and Go. When the user is assembling, it is only necessary to tighten the nut to the torque specified by the manufacturer to ensure the safety of the operation. Let Xiao Bian say something else again: The machine can be made properly, and it will be handed over to the machine. Comtech engineers also made a sound! Conmax wheels are patented in terms of bearing clearance! This "black magic" should not be underestimated. Its products can significantly increase the life of the bearings, and can even increase the bearing life to the same as the entire vehicle life. In addition, on the maintenance that we mentioned just now, Convoy also thought of our truck driver. It is more convenient to use Conley wheels for maintenance and maintenance. It does not require special tools to install the wheels, and it can guarantee the clearance. It is in the correct range. Knowledge point: Special tools are not needed, SO EASY! Mom no longer has to worry I will not install the wheel! The second key step is coming! Pre-conditioning technology? What? Another "black magic"? In addition to achieving a 100% clearance standard on the production line, the bearing clearance of the Conley hub can also be guaranteed within a safe range in actual operation, relying on ConMet's unique pre-conditioning technology. This technology ensures that the life and working conditions of the components are optimal, while also avoiding the risk of excessive play or too small clearance. Kangmai's technical engineers told Xiaobian that Kangmai's pre-conditioning technology should be guaranteed in two aspects: first, the semi-tolerance bearings used, this bearing has higher precision than ordinary products; Patented spacer design. This spacer can connect the inner rings of the inner and outer bearings together, and at the same time, it can produce elastic deformation. This deformation can adjust the tolerance range on the dimensional chain and the tightening torque, in other words, through the spacer deformation. To ensure that the clearance of the inner and outer bearings is within the normal range, these two main parts and design concepts are also the core of the pre-conditioning technology of the Camby hub. This is the case! What is the situation of the domestic hub? At present, the domestic hub products are hard-wired with inner and outer bearings and the shaft heads or joined with gaskets. After tightening and adjusting to achieve the set clearance, this cannot fully guarantee the clearance of the two bearings inside and outside. Within a reasonable range, it may cause a bearing to loosen a bearing and does not fundamentally realize the pre-regulation technique. This is the most obvious difference from the Conley hub with a spacer. Xiao Bian said so much and his mouth was dry. The Xiaobian who can learn so much can not help but ask a second serious question: Since there are security risks, why do most of the domestic drivers also use this type of hub product? Cheap! Cheap! Cheap! Important things to say three times! Comtech engineers said that this product is relatively cheap, will not increase costs, axle factory does not need to make changes, and even manufacturers have changed the vest also played The long-life, maintenance-free banner is very confusing even before the user experiences it. Finally, I would like to tell you, fondly, the truck friends who are watching the small code word. When operating the truck, don't forget the safety first! Our safety is not a child's play! 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Bearing clearance diagram 
The red part in the figure is a patented spacer designed by Conmet
What is the ghost of bearing clearance? Even if you are an old truck driver, it may not be clear. Of course, the rookie like China Truck Network Xiaobian even more do not know, do not worry! Knocked on the blackboard, draw focus, Xiao Bian by Nu (physical) (mind) learning (憔) Xi (悴) for everyone to popularize.