Reasons for the overheating of the motive bearing and its treatment

        1. Bearing damage. Should be replaced.

        2, rolling bearing grease is too little, too much or there are impurities such as iron filings. The capacity of the bearing grease should not exceed 70% of the total volume. Those with impurities should be replaced.

        3. The shaft and bearing are too tight or too loose. When it is too tight, it should be reground. If it is too loose, it should be set to the shaft.

        4. The bearing and the end cap are too tight or too loose. The bearing housing is machined when it is too tight, and the steel sleeve is placed inside the end cover when it is too loose.

        5. The motor ends or bearing caps are poorly assembled. Install or flatten the end cap or bearing cap stop and tighten the screws.

        6. The belt is too tight or the coupling is poorly assembled. Adjust the belt tension and correct the coupling.

        7, the sliding bearing lubricant is too little, there are impurities or oil ring stuck. Should be refueled, replaced with new oil, repaired or replaced oil ring

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Bearing speed and friction coefficient

      The speed of the bearing is mainly limited by the temperature rise caused by the frictional heat inside the bearing. When the speed exceeds a certain limit, the bearing cannot continue to rotate due to burns. The limit rotation speed of the bearing refers to a limit value that does not cause frictional heating that causes burns and can continuously rotate.
       Therefore, the ultimate speed of the bearing depends on the type, size and precision of the bearing as well as the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, and the load conditions. The limit speeds of various types of bearings using grease lubrication and oil lubrication (oil bath lubrication) are respectively included in the bearing size table. The values ​​indicate the standard design of the bearing under normal load conditions (C/P>=13, Fa/Fr<= 0.25 or so) The limit value of the rotation speed when rotating downward. In addition, depending on the type and grade of the lubricant, the lubricant may be superior to other properties but not suitable for high-speed rotation.
       The corrected load condition of the limit speed C/P<13 (that is, the equivalent dynamic load P exceeds 8% of the basic dynamic load C), or the axial load in the combined combined load exceeds 25% of the radial load. The following formula corrects the limit speed. Na=f1*f2*n where na: corrected limit speed, rpm f1: correction factor f2 related to load conditions: correction factor n related to combined load: limit speed under normal load conditions, rpm (refer to bearing size Table) C: Basic dynamic load rating, N{kgf} P : Equivalent dynamic load, N{kgf} Fr: Radial load, N{kgf} Fa: Axial load, N{kgf} Limit of ball bearing with seal ring Speed ​​limit with contact seal (RS type) Ball bearings are limited by the line speed of the seal contact surface, allowing the line speed to depend on the rubber material of the seal.

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How to choose sliding bearing oil

Core Tips: 1. Light and medium load sliding bearing lubricating oil selection working temperature 10-60 °C, journal pressure 3MPa or less: spindle journal speed 9m/s, lubricating oil 40°C viscosity 5-27mm2/s, suitable
1. Selection of lubricating oil for light and medium load sliding bearing The working temperature is 10-60 °C, and the journal pressure is below 3 MPa:
    Spindle journal speed > 9m / s, lubricating oil 40 ° C viscosity 5-27mm2 / s, suitable lubricants L-AN5, L-AN10, L-AN15 full loss system oil;
    Spindle journal speed 9-5m/s, lubricating oil 40°C viscosity 15-50mm2/s, suitable lubricating oil L-AN15, L-AN32 total loss system oil or L-TSA46 turbine oil;
    Spindle journal speed of 5-2.5m / s, lubricating oil 40 ° C viscosity 32-60mm2 / s, suitable lubricant L-AN32, L-AN46 full loss system oil or L-TSA46 turbine oil;
    Spindle journal speed: 2.5-1m/s, lubricating oil 40°C viscosity 42-70mm2/s, suitable lubricating oil L-AN46, L-AN68 total loss system oil or L-TSA46 turbine oil or No. 20 gasoline engine oil;
    Spindle journal speed of 1-0.3m/s, lubricating oil 40°C viscosity 42-80mm2/s, suitable lubricating oil L-AN46, L-AN68 total loss system oil or L-TSA46 turbine oil or No. 20 turbine oil ;
    Spindle journal speed of 0.3-0.1, oil 40 °C viscosity 70-150mm2 / s, suitable lubricating oil L-AN68, L-AN100, L-AN150 full loss system oil or 30# gasoline engine oil;
    Spindle journal speed <0.1m/s, oil 40°C viscosity 80-150mm2/s, suitable lubricating oil L-AN100, L-AN150 total loss system oil or 30#, 40# gasoline engine oil.
    2. The working temperature of medium and heavy load sliding bearing lubricating oil is 10-60°C, the journal pressure is below 3-7.5MPa: the spindle journal speed is 2-1.2m/s, the oil 40°C viscosity is 68-100mm2/s, suitable for Lubricating oil L-AN68, L-AN100 full loss system oil or No. 20 turbine oil;
    The spindle journal speed is 1.2-0.6m/s, the oil 40°C viscosity is 68-110mm2/s, and the applicable lubricating oil L-AN68, L-AN100 total loss system oil or No. 20 and No. 36 turbine oil;
    The spindle journal speed is 0.6-0.3m/s, the oil 40°C viscosity is 68-150mm2/s, and the applicable lubricating oil L-AN100, L-AN150 total loss system oil or No. 30 turbine oil or N100 compressor oil;
    The spindle journal speed is 0.3-0.1m/s, the oil 40°C viscosity is 100-220mm2/s, the applicable lubricating oil L-AN100, L-A150 full loss system oil or 40# turbine oil;
    Spindle journal speed <0.1m / s, oil 40 ° C viscosity 100-220mm2 / s, suitable lubricant L-AN150 full loss system oil or No. 40 turbine oil.

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Bearing damage and countermeasures

Core Tip: In general, if the bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, fatigue life
In general, if the bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, as opposed to fatigue life, is a quality use limit called a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.
    Regarding the damage state of the bearing, such as the ferrule of the roller bearing and the jam of the rib, it may be considered as a cause of insufficient lubricant, unsuitability, defects in the oil supply structure, intrusion of foreign matter, bearing installation error, shaft deflection If the song is too big, there will be coincidences of these reasons.
    Therefore, it is difficult to know the true cause of the damage by only investigating the bearing damage. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the bearing, and the situation before and after the accident, combined with the damage state of the bearing and several reasons, it can prevent similar accidents from happening again.

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