Mechanism Of Lubrications (thick Film) Presentation

Lubrication is essential in reducing friction and wear between moving surfaces.

Thick Film Lubrication is a mechanism that involves the formation of a thick layer of lubricant between surfaces.

It provides superior load-carrying capacity and is commonly used in heavy-duty applications.

Types of Thick Film Lubrication
Hydrodynamic Lubrication: Occurs when a fluid film is formed due to the relative motion between surfaces.

Elastohydrodynamic Lubrication (EHL): Involves the deformation of lubricant and surfaces under high loads.

Squeeze Film Lubrication: Occurs when the lubricant is squeezed between surfaces due to external forces.

Mechanism of Hydrodynamic Lubrication
The relative motion between surfaces causes a pressure gradient in the lubricant.

This pressure gradient generates a hydrodynamic wedge, lifting the surfaces apart.

The lubricant film thickness should be greater than the surface roughness to prevent metal-to-metal contact.

Mechanism of Elastohydrodynamic Lubrication (EHL)
EHL occurs under high loads and high speeds where the lubricant experiences severe deformation.

The lubricant forms a pressurized film between the surfaces, preventing direct contact.

The lubricant viscosity and elasticity play a crucial role in sustaining the film.

Mechanism of Squeeze Film Lubrication
Squeeze film lubrication occurs when external forces compress the lubricant between surfaces.

The lubricant acts as a cushion, absorbing and distributing the load evenly.

It is commonly used in journal bearings and thrust bearings.

Benefits of Thick Film Lubrication
Reduction in friction and wear between moving surfaces.

Increased load-carrying capacity, allowing for higher load applications.

Improved protection against surface damage and corrosion.

Factors Affecting Thick Film Lubrication
Lubricant viscosity: Higher viscosity provides a thicker film for better lubrication.

Surface roughness: Smoother surfaces reduce the risk of metal-to-metal contact.

Operating temperature: Extreme temperatures can affect the lubricant's viscosity and performance.

Applications of Thick Film Lubrication
Heavy machinery and equipment, such as engines, turbines, and gearboxes.

Automotive industry for engine and transmission components.

Industrial applications, including steel mills, paper mills, and power plants.

Maintenance and Considerations
Regular lubricant analysis to ensure proper viscosity and contamination levels.

Periodic checks of lubricant film thickness and surface condition.

Adequate lubricant replenishment and filtration to maintain optimal performance.

Thick Film Lubrication is a crucial mechanism in reducing friction and wear between moving surfaces.

It provides superior load-carrying capacity and protection against surface damage.

Understanding the mechanism and factors influencing thick film lubrication is essential for proper maintenance and application.

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