Domestic and foreign bearing test methods

At present, there are four main bearing test methods at home and abroad: 1. friction and wear test, second, test bench test, third, test room (test field) simulation test, and fourth, actual working condition operation test.

Foreign countries have used the above several test methods, but the application purpose is different. For example, to develop a brand new product, firstly, a friction and wear test must be performed. However, if there is not much change in the form of friction and wear, only the product size and load conditions change, only the bench, simulation or actual running test is needed. Foreign countries have very strict assessments of new products (such as car wheel bearings, etc.) in key parts, and must be tested in actual operation before they can be approved for use. Swedish SKF bearings, Japan NTN bearings, newly researched bearing simulation test technology, can only replace benches, simulations or experiments, to shorten the time of product design, speed up the progress of product development, but there is still a gap from the actual operation. At present, China's bearing industry has carried out friction and wear tests, only one of Luoyang Bearing Research Institute; has carried out bearing bench test, including Luoyang Bearing Research Institute, Shanghai Axis Research Institute, Hangzhou Bearing Test Center and Wafangdian, Harbin, etc. Yujiaguo has bearing enterprises; Luoyang Bearing Research Institute, Hangzhou Bearing Test Center, Luozhou, Xenxi and other enterprises can be launched for simulation test. In order to carry out the actual test, the bearing manufacturer will only carry out the requirements when the supporting mainframe enterprise puts forward this aspect, such as the wheel bearing of the railway passenger wheel to the bearing and the car. In short, the domestic implementation of simulation and actual operation test is not extensive, and should further expand the scope of the host or the actual working conditions, and prepare sufficient software and hardware for the simulation test to mention the schedule as soon as possible.

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Domestic and foreign bearing test methods

At present, there are four main bearing test methods at home and abroad: 1. friction and wear test, second, test bench test, third, test room (test field) simulation test, and fourth, actual working condition operation test.

Foreign countries have used the above several test methods, but the application purpose is different. For example, to develop a brand new product, firstly, a friction and wear test must be performed. However, if there is not much change in the form of friction and wear, only the product size and load conditions change, only the bench, simulation or actual running test is needed. Foreign countries have very strict assessments of new products (such as car wheel bearings, etc.) in key parts, and must be tested in actual operation before they can be approved for use. Swedish SKF bearings, Japan NTN bearings, newly researched bearing simulation test technology, can only replace benches, simulations or experiments, to shorten the time of product design, speed up the progress of product development, but there is still a gap from the actual operation. At present, China's bearing industry has carried out friction and wear tests, only one of Luoyang Bearing Research Institute; has carried out bearing bench test, including Luoyang Bearing Research Institute, Shanghai Axis Research Institute, Hangzhou Bearing Test Center and Wafangdian, Harbin, etc. Yujiaguo has bearing enterprises; Luoyang Bearing Research Institute, Hangzhou Bearing Test Center, Luozhou, Xenxi and other enterprises can be launched for simulation test. In order to carry out the actual test, the bearing manufacturer will only carry out the requirements when the supporting mainframe enterprise puts forward this aspect, such as the wheel bearing of the railway passenger wheel to the bearing and the car. In short, the domestic implementation of simulation and actual operation test is not extensive, and should further expand the scope of the host or the actual working conditions, and prepare sufficient software and hardware for the simulation test to mention the schedule as soon as possible.

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Introduction to common causes of damage to imported bearings

Most of the imported bearings are damaged for many reasons, such as excessively small bearing clearances caused by previously estimated loads, ineffective seals, and tight fits. Any of these factors have their particular type of damage and leave a special mark of damage. Therefore, inspecting the bearing of the damaged shaft, in most cases, its possible cause can be found.

In general, one-third of bearing damage is caused by fatigue damage, the other third is due to poor lubrication, and the other third is due to contaminants entering the bearing or improperly installed. However, these types of damage are also related to industry. For example, most of the pulp and paper industry is due to poor lubrication or contamination resulting in bearing damage rather than material fatigue.

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Application design considerations for variable speed bearings

Application design considerations for variable speed bearings
    1. Reference to the shape and connection dimensions of variable speed drive bearings
    2. The variable speed drive bearing can be placed horizontally or vertically or tilted. Can be rotated forward and backward. Positive and negative input and output power (ie deceleration or speed increase).
    3, variable speed drive bearing regardless of the installation method, and its couplings have size matching requirements.
    Recommended:
    The inner ring hole d and the shaft are matched by H7/h6;
    The pin hole do of the middle ring and the transmission are matched by H7/r6;
    The outer ring D and the housing are matched by H8/h7;
    The gear is matched with the hole on the output shaft by a clearance fit, and the gap is 0.2~0.5mm.
    4. Axial positioning of variable speed transmission bearings: After any three turns of the ring are axially positioned, the other two axes do not need to be axially positioned.
    5. Positioning in the direction of rotation; both the outer ring and the inner ring are flat key positions. The middle circle is using the drive positioning
    6. The variable speed drive bearing can bear a small external force in the radial direction, as shown in Figure 5, but it is not suitable for a large working load.
    7. Transmission ratio is the transmission ratio according to the first installation method. If other installation methods are used, the gear ratio should be calculated according to Table 1.
    8. At rated speed (1500 rpm), select the variable speed drive bearing model according to the transmission ratio and required power (Kw) according to Table 2.
    9. When based on the working torque, select the model according to Table 3.
    10. The selection of the reducer model is consistent with the model of the variable speed drive bearing.

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