Bearing early damage burned much more common than the bearing, so prevention is very important bearing early damage. Sliding bearing proper maintenance is an effective way to reduce early bearing damage, but also to extend the reliable guarantee bearing life. Thus, in the engine of routine maintenance and repairs, must pay attention alloy surface, the back, the appearance of the tip and edge shape of the bearing edges and corners, if more than half of abnormal wear or signs appear, we should seriously investigate the cause and take appropriate measures to improve the working conditions of the bearing, the importance of bearing early damage prevention.
(1) to improve the design and manufacturing process design or selection of bearings bearings, bearings to be considered in order 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 decreases, the gap change, make the bearing babbitt soften, serious when it has a "bush-burning axle" accident. Accordingly, in the structural design, from the bearing of the bush (non-bearing zone) moved into the top hole, the lubricating oil is introduced from the non-bearing zone; in the bearing surface into the hole as the center of the longitudinal or transverse open tank, conducive to the uniform distribution of the lubricating oil to control the temperature rise in the journal. According to the work of the bearing, require bearing materials must have the following properties: low coefficient of friction; good thermal conductivity, thermal expansion coefficient; wear and corrosion resistance and anti-bonding capability; have sufficient mechanical strength and plasticity. Therefore, babbitt bearing material may be selected. 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 ability to use the power of the engine better. In recent years, there have been foreign physical vapor deposition sputtering on the surface of nickel-copper-lead bearing gate plated aluminum alloy containing 20% tin or tin plated pure, very good. In addition, the whole circle bearing sump oil tank or in part to the semicircular bearing sump, so not only can improve the engine bearing lubrication state, but also to improve its carrying capacity.
(2) to improve the maintenance and improvement of the hinge bearing assembly quality with quality bearings ensure smooth without spots on the back bearing, 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; installed in each end of the bottom two bearing bush should be higher than the 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 bearing; bearing Faces can not reach 75% -85% by scraping contact patch with France as a measure, should not scrape When you make with the gap bearing and journal meet the requirements. Also, pay attention to the assembly to check the crankshaft bearing journal and processing quality, strict implementation of the repair process specifications, and prevent improper loading method and installation errors caused by torque and bearing bolts uneven or non-compliance, resulting in bending and stress centralized, leading to early bearing damage.
