Bearing on the bearing, contact directly with the shaft parts, load bearing shaft and have relative motion.
In order to reduce friction and wear of bearing material put forward all kinds of requirements, in addition to the required friction pair between small friction coefficient, wear also should meet the following: 1.
Should have enough compressive strength, fatigue resistance and the ability to withstand impact.
The thickness of the bearing alloy for (
0.
013 -
0.
13)
mm。
2.
Good tackiness resistance.
When a large load, high speed, bearing gap is too small, surface finish is not high, poor lubrication, to pay attention to the matching of carefully selected materials, prevent friction pair a agglutination adhesive wear.
3.
Adaptive and the ability to accommodate foreign body.
Low coefficient of low hardness, good plasticity and elasticity material has good adaptability and the ability to accommodate foreign body.
4.
Good corrosion resistance, low prices, sources.
Generated by oxidation of colloidal sediment after corrosion to the bearing shell material.
A, commonly used material bearing and the bearing bush commonly used material divided into two categories: metal materials and nonmetal materials.
Metal materials: 1.
Ordinary grey cast iron, cast iron, nodular cast iron is suitable for low speed and light load, or open the bearing mechanism of transmission: the flake or spheroidal graphite composition in materials, covering the surface lubrication graphite layer.
2.
ZChSnSb10 - bearing alloy
6 good corrosion resistance, strong bonding capacity, combined with the steel back, the price is expensive, suitable for high speed overloading, such as rolling stock.
ZChPbSb16-
16 -
2 agglutination resistance is poor, poor thermal expansion, crisp is suitable for medium load.
The babbitt good abrasion resistance, resistance to glue, thermal conductivity, the most suitable for bearing shell material.
3.
Bronze ZCuPb30 with casting or sintering in steel bearing bush back to a pair of metal surface, good bonding resistance ZCuSn10 -
L antifriction and wear resistance are good, the best bearing shell material, high overloading this kind of material than pap and high hardness and strength, corrosion resistance, but poor running-in, matching the journal requires a higher hardness and roughness, is suitable for medium speed overloading.
4.
Aluminum alloy -
-
Bimetallic low tin alloy, including Sn0.
5% of high tin aluminum alloy, including Sn20 %, locomotive diesel engine with this kind of material high strength, corrosion resistance, good thermal conductivity.
5.
TaoCiZhi metallic iron powder, graphite powder, copper powder or ten graphite powder to suppress forming, sintering formation pore structure, porosity of 15-35% - oiled boiled - oil bearing.
The bearing shell due to poor toughness is only applicable to steady load and small and medium speed, poor lubrication condition for occasions.
Non-metallic materials: easy running-in wear debris soft, with little agglutination possibility 1 journal affinity.
Plastic, bakelite, acyl aldehyde (
Nylon)
And polytetrafluoroethylene have larger compressive strength, adhesion and abrasion resistance, good corrosion resistance, low friction coefficient, increasingly widely applied, but poor thermal conductivity, so the water lubrication, such as roller press, hydraulic press 2.
Rubber with hardening of the rubber, used for shaft vibration, inclination, more dirty, water lubrication integral whole casting split second, bearing structure
