Sliding bearing damage prevention measures

Bearing early damage than the bearing burned much more common, and therefore prevent early bearing damage is very important. Sliding bearing proper maintenance is an effective way to reduce early bearing damage, but also a reliable guarantee extended bearing life. Therefore, in the engine of routine maintenance and repairs, you must pay attention to the alloy surface, the back edge of the external shape of the tip and at the edges of the bearing, if any anomalies or signs of wear appear more than half, we must carefully identify the cause and take appropriate measures to improve the working conditions of the bearing, the importance of early bearing damage prevention.
(1) to improve the design and manufacturing process design bearings or bearing selection, bearing to be considered to control the temperature of the heat balance. Because the bearings in the friction state work, due to internal friction of a liquid lubricating oil (viscosity) and cause power into heat after the bearing temperature rise caused by lubricating oil viscosity reduce the gap change, make the bearing babbitt soften, serious generated when the "bush-burning axle" accident. Accordingly, in the structural design, from the bearing bush (non-bearing zone) moved into the top hole, the lubricating oil is introduced from the non-bearing area; in the surface of the pad into the hole as the center longitudinal or transverse open tank, conducive to the lubricating oil is evenly distributed over the journal to control the temperature rise. According to the work of bearing the required bearing material must have the following properties: low coefficient of friction; good thermal conductivity, thermal expansion coefficient; wear resistance, corrosion resistance and anti-bonding ability; have sufficient mechanical strength and plasticity. Therefore, bearing materials Optional babbitt. Babbit in a stable load can better work, but in the non-steady load prone to cavitation, so should not be used in high-power engine. High strength and high hardness and low tin-lead alloys of tin-lead alloys, strong anti-fatigue and anti-cavitation capabilities, the use of high-power engines better. In recent years, there have been foreign physical vapor deposition sputtering on the surface of nickel-copper-lead bearing grid plated aluminum alloy containing 20% ​​pure tin or tin-plated, with good results. In addition, the whole semi-circle to pad sump sump sump or part of the pad, so not only can improve the engine bearing lubrication state, but also increase its carrying capacity.
(2) improve the quality of maintenance and assembly bearing hinges with improving the quality of the bearing, bearing to ensure smooth without spots on the back, positioning bump intact; its bounce amount of 0.5-1.5mm, which can ensure the bush after assembly with its own stretch and the bearing bore fit tightly; each end mounted in the upper and lower bearing bush should be higher than the two bearing plane 30-501μm, higher than the amount guaranteed by the specified torque to tighten the bearing cap bolts after bearing and housing close cooperate to generate sufficient frictional self-locking force, bearing without loose, good cooling effect, prevent erosion and wear of bearings; bearings Faces not reach 75% -85% by scraping contact patch with France as the measure should not scrape when they make the bearing with the gap and meet the requirements of the journal. Also, pay attention when assembling and processing quality inspection crank journal bearing, strict implementation of the repair process specifications, and prevent improper loading method caused by installation errors and bearing bolt torque irregularity or non-compliance, resulting in bending deformation and stress concentrated, leading to early bearing damage.