INA bearing belongs to the schaeffler group's German bearing company, was founded in 1946, headquartered in nuremberg in Germany. German INA bearing company since its inception, has been dedicated to chong hing products, has been to meet customer needs, and provide the high quality guarantee, making it the world first rolling bearing suppliers. INA bearings products: INA bearings, INA sliding bearings, INA linear rolling guide bearings, INA high precision products, INA engine components and so on.
INA bearing quality TIMKEN Bearings http://www.bearing-sa.com/ .
Exquisite rolling bearing technology, the advanced technology of production factory, quality is the quality standard of INA bearings enjoys a high reputation around the world. INA bearing products are both costs and benefits of reliable mechanical parts, INA offers a variety of different size series, for all various specialized technology to provide a series of different size, design personnel to provide technical support for every profession and trade.
Use on the engine of the sliding bearing is usually divided into two kinds: one kind is a thin-walled bearing bushing type, shape of tiles commonly known as bearing shell; The other is a liner, is also called copper sets, for hollow cylinder shape. Bushing type is mainly used for thin wall bearing retainer engine crankshaft and connecting rod; Bushing is mainly used for bearing CAM shaft neck and piston pins. We mainly learn is below bushing type the form of early damage of the thin wall bearing (bearing) and preventive measures.
In the form of early damage
Bearing in the process of normal use, due to the gradual wear and tear until the end of the last loss of working ability, its service life, the natural damage is difficult to avoid. But if an engine assembly improper adjustment, lubricating oil quality is bad or use conditions and other factors caused the bearing wear or prematurely appear all sorts of injury, early damage is man-made. Early damage not only greatly reduce the service life of bearing, at the same time also can affect the normal work of the engine.
According to the maintenance experience of diesel engine is found for a long time, the common form of early damage of the sliding bearing has a mechanical damage, bearing hole corrosion, pitting corrosion fatigue, corrosion, etc.
(1) mechanical damage sliding bearing mechanical damage refers to bearing alloy surface appear different degree of the trench, serious when in contact surface metal strip and a large area of scratches; Under normal circumstances, the contact surface damage and ablation phenomenon exist at the same time. Bearing mechanical damage is the main reason of the difficult to form the oil film bearing surface or oil film were severely damaged.
(2) bearing cavitation sliding bearing in cylinder pressure under the action of repeated impact load), surface plastic deformation and cold work hardening, local loss of deformation ability, gradually formed and expanded, and then with the shedding of wear debris, formed in the surface layer loaded cavity. The cavitation, general bearing shell pits is first appeared, and then gradually expand the pits of the interface crack, and lead to an alloy layer along the interface crack parallel to the direction of extension, until it is peeling off. Sliding bearing is the main reason of the cavitation, due to structural elements such as oil groove and oil hole of the cross sectional sudden change flow caused by strong disturbance, in the vacuum area of the flow disorder form bubbles, then because of the pressure, generate cavitation bubble breaking. Cavitation occurs commonly in high load bearing, such as the crankshaft main bearing on the lower bearing.
(3) fatigue pitting bearing fatigue pitting refers to, because the engine to work overtime and make bearing overheating and bearing clearance is too large, central bearing fatigue damage and fatigue pitting or fall off. This kind of damage is mostly to overload, bearing clearance is too large, or lubricating oil is not clean, and mixed with caused by foreign bodies. Therefore, when using, should pay attention to avoid bearing overload work don't too low or too high speed operation; To adjust the engine to idle speed stable state; To ensure the normal bearing clearance, prevent engine speed too high or too low; Check, adjust the performance of the cooling system, to ensure that the engine working at a comfortable temperature.