Industrial sewing machine bearings are also lubricated with grease, and there are no special requirements for oil and water resistance. The axial size of the ring seal groove (the axial position of the seal groove) has a great influence. Comparing the groove contact seal structure in Fig.1. Therefore, the interference between the sealing ring lip and the inner ring sealing groove of this structure has a large dispersion. 2 for motorcycle engine case bearings. 1 to Fig. 1 is that the inner ring of the bearing does not have a seal groove and the sealing route is short, which is not conducive to sealing. Therefore, the requirements for the anti-leakage sealing performance of this type of bearing are very high, and the bearing must adopt a contact seal structure.

According to the different sealing materials, they are mainly divided into two types: rubber sealing ring and dust cover (standard iron cover): according to different seals, they can be divided into contact sealing and non-contacting seal. 4, the difference is that the structure of Fig. For sealed deep groove ball bearings such as motorcycles, home appliances motors, luxury ceiling fans, etc. Therefore, the sealing performance of the non-contact dust cover sealing structure of FIG. For example, the sealing grooves of precision low-pitched automotive bearings produced by some domestic bearing manufacturers are grinded with a shaped grinding wheel, which greatly improves the processing accuracy of the sealing groove and the accuracy of matching with the sealing ring, so that the sealing performance of the bearing

The quality of vibration and noise has been significantly improved. 5 uses a dust cover. At the same time, due to the better roughness of the outer diameter grinding of the inner ring, the friction torque of the bearing under the same sealing effect is smaller than that of the groove contact seal structure in Figure 1. For example, a single-sided sealed motorcycle engine case bearing is lubricated by splash lubrication by the engine oil in the engine when the engine is working. The sealing ring lip either has too little contact deformation, which affects the sealing effect, or the contact deformation is too large, increasing the contact surface The frictional torque and bearing rotating torque caused the vibration and noise to increase and the temperature rise too high and too fast when the bearing was working.

Since this structure requires high processing precision of the sealing ring and the sealing groove of the ferrule, and high production cost, it has not been widely adopted. 2 has the following four advantages: (1) The inner ring does not have a sealing Mechanical ball bearing manufacturers groove, so the processing cost is lower; (2) The sealing ring lip With the grinding inner and outer diameters, the interference is smaller; (3) The friction torque is smaller under the same sealing effect; (4) Under the same friction torque and the same oil pressure on the inner side of the sealing ring, the sealing ring lip The contact surface with the inner ring is not easy to separate, which is very advantageous for the sealing under pressure on the inside of the bearing seal ring.

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It can be used as a user to recheck the axial direction of double-row tapered roller bearings on site.” The foreign company’s “protrusion method” measuring instrument is equipped with a counterweight device to measure different sizes When double and four-row tapered roller bearings have axial clearance, the counterweight can be adjusted to meet the measurement requirements.

Fourth, the conclusion JB/T8236—2010 stipulates that “load blocks are added to the outer ring during measurement, and the load value should ensure that the rolling elements are in uniform contact with the raceway. Manufacturers and users of the main engine have explored various alternative measurement methods in practical applications. The users of the main engine often need to recheck the axial clearance and measure the double and four-row tapered rollers in accordance with the standard 'split method' When bearing axial clearance, a height gauge is used to determine the distance between the end face of the ring and the measurement platform.

The 'whole method' is currently an alternative measurement method widely used by users of the main engine. The manufacturing principle of the counterweight device is also very simple, and can be manufactured by ordinary bearing manufacturers.4 times that of the 'protrusion method'. This is due to the 'integral method' measurement, due to the self-locking problem of the next row of rolling elements, the gap measurement value is greater than its actual value, resulting in the actual clearance of the bearing when the clearance configuration is greater than the true value. The 'protrusion method' is a measurement method with accurate measurement and high measurement efficiency. The requirements for Wholesale Mechanical ball bearing manufacturers the bearing test platform are high, and it is difficult for users to achieve it on site.

Some foreign companies have adopted the 'projection method' when measuring the clearance of double and four-row tapered roller bearings without spacers, and have developed special measuring instruments, as shown in Figure 1. , Improve measurement accuracy, and then make beneficial improvements for bearing rotation accuracy increase, vibration reduction, and life extension.

The difference in the measured values ​​obtained by different measurement methods forces bearing manufacturers to increase the axial clearance value to 'match' the user's measurement method when configuring the clearance, causing the actual bearing clearance to be greater than the measured value, thereby reducing the rotation accuracy of the bearing and increasing the bearing Vibration and noise during operation will eventually reduce bearing life. Three, data analysis The measured data of the three measurement methods are shown in Figure 3. To sum up, learn from the principle of the foreign company's 'protrusion method' measuring instrument, make simple tooling to carry out double and four-row tapered roller bearing axial clearance test experiments, and compare and analyze the results obtained by different measurement methods.

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