Early bearing damage than the bearings burned much more common, so very important to the prevention of early bearing damage. The bearing proper maintenance is an effective way to reduce the damage of early bearing, but also a reliable guarantee for extended bearing life. Therefore, in the day-to-day maintenance and repair of the engine, must pay attention to the bearing surface of the alloy, the back end and the edge of the edges and corners of the appearance of the shape, if unusual or more than half wear a sign, it is necessary to carefully identify the reasons and take appropriate measures to improve the working conditions of the bearing, the emphasis on the prevention of early bearing damage.
Contact fatigue failure
Contact fatigue failure means the bearing surface by alternating stress failure. Contact fatigue spalling occurred in the bearing surface, often accompanied by fatigue crack, starting with the maximum alternating shear stress at the contact surfaces of the following, and then extended to the surface to form a different shape of spalling, such as point-like pitting or pitting peeling flaking into small pieces called shallow spalling. Due to the the flaking surface gradually expand, while often extended to the deep, forming deep peeling. The deep peel off contact fatigue failure fatigue source.
2. Wear failure
The wear failure refers relative due to friction between the surface of the constant wear and tear of its working surface metal VALID. Continuous wear will cause the bearing parts gradually corrupted and eventually lead to bearing loss of dimensional accuracy and other related issues. The abrasion may affect the shape change, with the gap increasing and work surface morphology changes may affect the lubricant or its pollution reaches a certain level and cause lubrication complete loss of function, thereby bearing the loss of rotation accuracy even can not operate normally. The Wear Failure is one of the common failure mode of all kinds of bearings, wear form usually can be divided into the most common abrasive wear and adhesive wear.
Refers to the work surface between the abrasive wear debris and contacts the surface of the squeeze inward hard particles or hard foreign or metal surfaces caused by the relative movement of the wear, and often in the bearing surface to cause galling of the furrow-shaped. Hard particles or foreign matter may come from the host internally or from other adjacent parts of the host system by feeding inside the bearing lubrication medium. Adhesive wear means uneven force are due to the microstructure of the friction surface of the friction surface bumps or foreign objects in the serious deterioration of the lubrication conditions, due to local friction and heat, could easily lead to local friction surface deformation and friction phenomenon of micro-welding, serious when the surface of metal may be partially melted, the force of the contact surface will be a point of local friction welding torn from the substrate increases the plastic deformation. Adhesive - adhesive wear and tear - adhesion cycle constitutes, in general, a slight adhesive wear is called abrasions, severe adhesive wear called the bite.
3. Fracture failure
The fracture failure mainly due to the defects and overload two factors. When the applied load exceeds the material strength limit, causing parts breakage called overload fracture. Overload Host sudden failure or improper installation. Bearing parts of the micro-cracks, shrinkage, bubbles, bulk foreign debris, overheating organizations and local burn defects in shock overload or excessive vibration will cause the defect at the fracture, fracture called defective. It should be noted that, bearing retest of the raw materials into the plant, forging and heat treatment in the manufacturing process, quality control, process control can be correctly analyzed by the instrument above defect exists, control must be strengthened in the future. But, in general, usually bearing fracture failure failure most of overload.
Strengthen the oil filter, crankcase ventilation cleaning and maintenance requirements in a timely manner in accordance with the instructions to replace the filter; ensure the normal work of the engine cooling system, control the normal temperature of a good engine, to prevent radiator "boil", is strictly prohibited without the cooling water on the carriageway ; the correct selection of the fuel, accurate adjustment of the valve timing and ignition timing to prevent abnormal combustion engine: a timely manner the technical condition of the crankshaft and the bearing checking and adjustment work. The regular oil Ferrography analysis, reduce the accident and combined oil Ferrography, early detection of abnormal wear, oil Ferrography pattern accurately determine the abrasive ingredients and possible location and take preventive measures to avoid the grind watts burning shaft accident.


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