Lubrication, Friction And Wear

Lubrication is the process or technique of using a lubricant (liquids, gases, vapors, i.e., fluids, plastic substances and solids in powder form) to reduce friction and wear and tear in a contact between two moving surfaces.

General lubrication functions are

Power transmission, such as oil control valves in some classic engine.

Reduction of friction and wear, this is most common function of lubrication.

Damping of impact and vibration, such as hydraulic valve actuator application.

Reduction of noise, which is similar with damping function.

Cooling: Dissipation of friction heat, such as the piston jet.

Cleaning: Discharge of particles of all kinds.

Corrosion protection.

In engine system, friction and wear are two main topics related to lubrication.

Friction in engine systems is what we want to reduce or eliminate because part of the mechanical energy already "generated" with poor efficiency is converted again into thermodynamically "lower valency" heat. By reducing the viscosity and load-bearing strength of the lubricant, this heat impairs the function of components. In extreme cases, damage can occur because of the bearings running warm or hot. Friction can be classified as dry friction, fluid or viscous friction, gas friction and mixed friction.

Types of friction includes static, kinetic, rolling friction and etc.

Wear in engine is inevitable, but we can control the rate by lubrication and surface roughness, coating and etc. Wear can be classified as adhesive, abrasive, corrosive and fatigue wear, among them, adhesive and abrasive wear are the most common types in engine.

As a key domestic OE supplier, Wellfar is specialized in the R&D, manufacturing, supply of precision auto parts such as piston rings, piston, cylinder liner, engine bearings and also turbocharger components.??

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Cost control is ever-lasting theme, all of our associates from top management to on-sport workers are striving hard to save production cost through vave process, continuously creating productivity for our customers, especially in today increasingly cost concerned auto industry.???

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