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The Main Requirements of the Engine for Sliding Bearing Materials

     From the engine bearing the working conditions to consider the requirements of the bearing 

matreial is multifaceted, which mainly have the following few:

     1. Have a high enough fatigue strength. The load acting on the bearing has an alternating and

impact. The bearing friction-reducing alloy material should have the same fatigue strength as the 

load, so as to avoid cracking and peeling. It is required to have the bonding strength between the

steel back and alloy layer and sufficient bounding strength. The mechanical properties (strength 

and hardness ) of the bearing alloy should also vary with temperature to accommodate the

 bearing's performance requirements at high temperatures.

     In addition, the bearing capacity of bearing alloy and the bearing and bearing stiffness are 

related to the smaller deformation, alloy layer stress is smaller, the higher the carrying 

capacity. The bearing has a steel back and the thickness of the friction-reducing alloy layer is 

small (no more than 0.4 mm ) for the reason.

     2. Have good anti-friction properties, including anti-bite Taiwan, nestability and 

compliance. Anti-bite is the temporary interruption of the oil film, bearing and journal surface 

with local direct contact, high friction temperature ( start and stop process, suddenly off the 

oil, etc ), bearings and journals are not easy to bite each other and abrasions Nature,which is 

related to the lipophilicity of the bearing alloy. Lipoohilic good, to maintain the ability of

 the border oil film strong, oil film cut off  after the recovery is also fast, the bearing 

resistance to seizure like. Inclusion means that the bearing alloy allows a small amount of hard 

dust, debris and other fine particles embedded in the alloy layer and avoid scratching the indica 

and consequently the ability to hurt themselves. Compliance refers to the ability of the bearing 

alloy layer to accomodate journal geometry deviation of deformation to reduce adge loading and 

wear, uniforming load and wear. Bearing resistance to the occlusal, embedded and good 

adaptability, bearing alloy and matching journal is more wear-resistant, long life, but the 

bearing wear reistance and other factors, such as bearing hardness, journal material, hardness, 

surface roughness and lubrication.

     3.Corrosion resistance. In the use of crankcase oil constantly oxidized deterioration, the 

formation of organic acids and peroxy compounds, the bearing surface corrosion, so the bearing 

alloy has a good corrosion resistance.

     4. Anti-corrosion. Bear the bearing surface lubrication of the local pressure drop caused by 

the ability of bubble burst damage.

     5.The tile material should have sufficient compression yield limit. The tile material shall 

be of sufficient strength to bond directly or through the intermediate layer and the friction-

reducing alloy layer. On the other hand, the bearin pad shall be fitted in the bearing housing 

hole with sufficient interference and the tile material must have a sufficiently high yield limit.

Low carbon steel is in line with the above requirements of the material, commonly used in China 

08,10 and 15 high-quality carbon steel. Almost no bearing friction reduction alloy can meet the 

above requirements at the same time. In general, the harder material has a higher mechanical 

properties, the softer material has a better surface friction performance. The reason why widely

 used in the basic alloy layer plus soft alloy coating (thickness 0.013-0.03 dish) three-tier pad 

structure, is to improve the surface friction performance while maintaining the basic alloy layer 

of higher machinery performance.