Sliding bearing features and performance
2018-03-22
Slide bearings run smoothly, reliably, with low noise or no noise. Under the conditions of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact with the oil-free bearing, and the friction loss can be reduced to a great extent. The oil film has a certain vibration-absorbing ability, but the friction resistance during starting operation is large. The part where the shaft is supported by the bearing is called the journal, and the part that matches the journal is called the bearing. The friction-reducing material layer cast on its inner surface to improve the frictional properties of the pad surface is called a bearing lining. Bearing pads and bearing lining materials are collectively referred to as plain bearing materials.
Sleeve bearing materials commonly used bushing babbitt (bearing alloy or white alloy), wear-resistant cast iron, copper-based and aluminum-based alloys, powder smelting self-lubricating bearing gold material, plastic, rubber, hardwood and carbon-graphite, poly four Vinyl fluoride (Teflon, PTFE), modified polyoxymethylene (POM), etc.
Coefficient of friction
It is the ratio of the frictional force between two surfaces and the vertical force (load) acting on one surface. It is related to the roughness of the surface, regardless of the size of the contact area.
Abrasion resistance: The wear resistance of bearing materials in friction systems is usually expressed in terms of thickness or weight loss (generally speaking, a hard shaft matches a soft sleeve and the sleeve wears first)
Friction temperature
When the shaft and the sleeve move, friction will occur, and the friction will generate heat. The heat will increase the temperature of the shaft and the sleeve, which will reduce the fit gap between the shaft and the sleeve. At the same time, the frictional heat will make the shaft and sleeve surface The increased molecular activity results in the adhesion of the shaft to the shaft sleeve, which eventually results in the biting of the shaft and prevents the system from operating.
Compliance
The bearing material compensates for the poor initial mating performance of the sliding surface by the elasto-plastic deformation of the surface layer (the compliance of soft elastic products is good, such as SF-1 compliance greater than JDB)
Wearability
Under the specified shaft material and specific lubricating oil conditions, after the initial running-in, a stable friction coefficient is ensured, and no seizure performance (good running-in of the product with short running-in period) (friction/wear curve) is ensured.
Embeddedness
The bearing material allows hard particles to be embedded, which reduces scratch or abrasive wear (soft material has better embedment than hard material, JF700 has better embedment than JF800). Shaft and bushing are in operation.
Under oil-lubricated conditions, the general shaft and bushings will operate in at least three states.
Dry friction
Friction between objects or between specimens without any lubricant.
Boundary lubrication
The critical state before the transition from liquid lubrication to dry friction (direct contact of friction pair surfaces).
Hydrodynamic lubrication
Two friction surfaces, which are relatively moving objects, completely separate the two friction surfaces with a viscous fluid film created by the relative velocity, and the external load is balanced by the pressure generated by the fluid film, which is called hydrodynamic lubrication.
Hunan Jintai Hardware and Machinery Co.,Ltd. is a professional manufacturer on various kind of bearings over 15 years China factory.
We are making all kinds of slide bearings including DU PTFE composit bushing, DX POM composite bushing,bimetal bushing,wrapped bronze bushing, cast sliding bushings and wear plate bearing pad, sintered bronze bushing and sintering parts, ball transfer bearings, etc.
The shapes of bearings can be in sleeve, flanged, spherical, plate, washer, pad, ring, square etc.
Base materials in carbon steel, harden steel, iron, stainless steel, bronze, brass, copper, bronze-steel alloy.Lubricant materials in PTFE, teflon, POM, nylon, plastic, oil, graphite, grease, MoS2, etc.
Export to America,Canada,Brazil,Peru,Argentina,Chile,Paraguay,Europe,Finland,France,Germany,Italy,Spain,Sweden,
Britain,Estonia,Ukraine,Turkey,Austrial,Russia,Korea,Malaysia,Singapore,Thailand,Egypt,Kenya,Somali,
Congo,Zimbabwe,South Africa,etc.
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