Early damage to sliding SKF bearings is much more common than burning SKF bearings, so it is important to prevent early damage to sliding SKF bearings. The correct maintenance of sliding SKF bearings is an effective way to reduce the early damage of SKF bearings, and it is also a reliable guarantee for extending the life of SKF bearings. Therefore, in the daily maintenance and repair of the engine, attention must be paid to the appearance and shape of the alloy surface, back, end and edge corners of SKF bearings. If there is any abnormality or signs of excessive wear, it is necessary to carefully investigate the cause and take measures Corresponding measures have been taken to improve the working conditions of SKF bearings and pay attention to the prevention of early damage to sliding SKF bearings.

    (1) Improve the design and manufacturing process of SKF bearings

    When designing or selecting SKF bearings, the thermal balance of SKF bearings should be considered to control temperature rise.

    Because SKF bearings work under friction, power consumption is caused by the internal friction (viscosity) of the lubricating oil liquid. After being converted into heat, the SKF bearing temperature rises, the lubricating oil viscosity decreases, and the gap changes, which will cause the babbitt alloy of SKF bearings. Soften, in severe cases, "burning bushes and axis holding" accidents will occur.

    Therefore, in the structural design, the oil inlet hole should be opened from the top of the upper bearing shell (non-loading area) of the SKF bearing, so that the lubricating oil is introduced from the non-loading area; the inner surface of the bearing shell is longitudinally or horizontally opened with the oil inlet hole as the center. , Which is conducive to uniform distribution of lubricating oil on the journal to control the temperature rise.

    According to the working conditions of SKF bearings, SKF bearing materials are required to have the following properties: low friction coefficient; good thermal conductivity and low thermal expansion coefficient; strong wear resistance, corrosion resistance and anti-adhesive ability; sufficient mechanical strength and plasticity. Therefore, the bearing material can be babbitt alloy. Babbitt alloy can work well under stable load, but it is prone to cavitation under unstable load, so it is not suitable for use in high-power engines.

    The high-tin-lead-based alloy and low-tin-lead-based alloy have high strength and hardness, strong fatigue resistance and cavitation resistance, and have better effects in high-power engines.SKF Bearing 1310 ETN9 online, click here to contact us.

    (2) Improve the maintenance and assembly quality of SKF bearings

    Improve the hinge quality of SKF bearings, ensure that the back of SKF bearings is smooth and spotless, and the positioning bumps are intact and undamaged; the self-opening amount is 0.5-1.5mm, which can ensure that the bearing bushes closely fit the SKF bearing housing hole by virtue of their own elasticity after assembly ; Each end of the upper and lower bearing shells installed in the SKF bearing housing should be 30-501μm higher than the plane of the SKF bearing housing. The higher amount can ensure that the SKF bearing and the SKF bearing housing are tightly matched after the SKF bearing cap bolts are tightened according to the specified torque. Generate sufficient friction and self-locking force, SKF bearings will not loosen, have good heat dissipation effect, and prevent SKF bearings from ablation and wear; the working surface of SKF bearings cannot reach 75%-85% of contact marks by scraping and matching. When scraping, the clearance between the SKF bearing and the journal meets the requirements.

    In addition, pay attention to checking the processing quality of crankshaft journals and SKF bearings during assembly, and strictly implement the repair process specifications to prevent incorrect installation due to improper installation methods and uneven or non-compliant torque of SKF bearing bolts, resulting in bending deformation And stress concentration, leading to early damage to SKF bearings.

    (3) Reasonable selection and filling of lubricating oil

     In the process of use, lubricating oil with low oil film surface tension should be selected to reduce the impact of the oil flow when the formed bubbles collapse, which can effectively prevent SKF bearing cavitation; the viscosity level of the lubricating oil cannot be increased at will, so as not to increase The coking tendency of SKF bearings; the lubricating oil surface of the engine must be within the standard range, and the lubricating oil and refueling tools must be clean to prevent any dirt and water(4) Correct use and maintenance of the engine

    When installing SKF bearings, the moving surfaces of the shaft and SKF bearings should be coated with clean oil of the specified brand. After the engine SKF bearing is installed, turn off the fuel switch before starting for the first time, use the starter to drive the engine to idling several times, turn on and turn on the fuel switch after the engine oil pressure gauge shows, and set the throttle to the middle and low speed position to start The engine is operated and observed. The idle running time cannot exceed 5 minutes. Do a good job in the running-in operation of the engine during the running-in period of the new engine and after overhaul. During the running-in period, it is forbidden to work for a long time under the condition of rapid load increase and decrease and high speed; the engine cannot be stopped immediately after the long-time full-load work is over. It can be stopped after 15 minutes of running at medium and low speed, otherwise the internal heat will not be dissipated.

    Strengthen the cleaning and maintenance of the oil filter and crankcase ventilation device, and replace the filter element in time according to the instructions; ensure the normal operation of the engine cooling system, control the normal temperature of the engine, and prevent the radiator from boiling. It is strictly forbidden to do without cooling water. Car; choose fuel correctly, adjust gas phase and ignition timing accurately to prevent abnormal combustion of the engine; check and adjust the technical condition of the crankshaft and SKF bearings in time. from entering, while ensuring the sealing effect of all parts of the engine. Pay attention to regular inspection and replacement of lubricating oil; the place where lubricating oil is filled should be free of pollution and sand to prevent the intrusion of all pollutants; lubricating oils of different qualities, different viscosity grades and different types of use are prohibited from mixing. The precipitation time should generally not be less than 48h.

    (4) Correct use and maintenance of the engine

    When installing SKF bearings, the moving surfaces of the shaft and SKF bearings should be coated with clean oil of the specified brand. After the engine SKF bearing is installed, turn off the fuel switch before starting for the first time, use the starter to drive the engine to idling several times, turn on and turn on the fuel switch after the engine oil pressure gauge shows, and set the throttle to the middle and low speed position to start The engine is operated and observed. The idle running time cannot exceed 5 minutes. Do a good job in the running-in operation of the engine during the running-in period of the new engine and after overhaul. During the running-in period, it is forbidden to work for a long time under the condition of rapid load increase and decrease and high speed; the engine cannot be stopped immediately after the long-time full-load work is over. It can be stopped after 15 minutes of running at medium and low speed, otherwise the internal heat will not be dissipated.

    Strengthen the cleaning and maintenance of the oil filter and crankcase ventilation device, and replace the filter element in time according to the instructions; ensure the normal operation of the engine cooling system, control the normal temperature of the engine, and prevent the radiator from boiling. It is strictly forbidden to do without cooling water. Car; choose fuel correctly, adjust gas phase and ignition timing accurately to prevent abnormal combustion of the engine; check and adjust the technical condition of the crankshaft and SKF bearings in time.Eric Bearing Limited provides SKF Bearing 2206 E-2RS1TN9, contact us to buy it.

    Eric Bearing Limited provides high-quality SKF Beaings. Products are exported to more than 100 countries and regions in the world. Customers are willing to choose our products because they are of good quality and their prices are alse competitive in the market. We have established long-term cooperative relations with customers.