Vehicle 'burn' holding shaft

Vehicle 'burn' holding shaft factors - 2020 09 - 01 'tile burning holding shaft is the most of a serious breakdown of engine, generally refers to the engine crankshaft and support its big rotating sliding bearing of the tile, small tile due to long time between oil severe dry friction, the formation of a surface temperature, shaft neck and sintering killed each other, unable to turn the engine. Car causes of 'hold shaft tile burning more than 95% are mechanical failure, usually due to: 1, the crankshaft with the tile's quality is bad, journal and the tile surface finish is poor, especially the overhaul replacement vehicles bearing shell, overhaul of the grinding shaft tile work fine enough, tile on the rear axle, with bad cooperation, difficult to form the oil film interface is too small, and there is gap on the back, alloy and tile can't completely loose fit closely and cylindrical, covering oil hole wall form dry friction causes oil supply disruptions. 2, large and small tile installation is not correct, improper clearance adjustment, contact area is too big or too small, will make the contact surface of shaft and difficult to form the oil film. Sometimes bearing bolts fastening torque is too small, in the long run the bearing looseness, can also cause clearance changes affect the lubrication. 3, oil pump gear of the serious wear failure, oil supply pressure is reduced, the oil is difficult to supply to the specified lubrication, the four dry friction. 4, oil oil is not clean impurities clogging, made for the oil to the crankshaft is cut off, form the dry friction bearing shell. 5, the oil pipeline leak, the oil supply system pressure drop, the oil is difficult to supply to the specified lubricating location, form the dry friction bearing shell. 6, cold fierce detonation throttle when starting car, the oil in low temperature pump more viscous state has not yet to bearing, and has formed the instantaneous high temperature bearing surface, metal burning-out each other. 7, engine severely overstretched, a long time, the working condition of low speed and high torque due to low engine speed the timing pump speed is also low, oil shortage, but between shaft and tile forming temperature, causing death. The mechanical problem is the main cause of 'tile burning holding shaft, there are only two special circumstances may cause severe faults because of the oil factor: 1, due to the cooling water seeping into the oil, due to the oil emulsion, deterioration, viscosity loss completely, cannot form the oil film in the surface of shaft with tile, causing more severe dry friction. 2, winter engine temperature is too low, the fuel atomization is bad, make the oil cylinder wall incomplete combustion into the oil bottom dilute lubricating oil, also creates' tile burning holding shaft. Use 3, cold season, high pour point oil viscosity is too high, or some indiscriminate will contain much of viscous effect of additive mixed with oil, can cause the oil flow velocity in the oil way too slow, cannot pump to the bearing shell on time, the friction between the bearing shell. （ Source: web)