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.