What is a piston pin boss?

What is a piston pin boss?

The piston pin is the link between the piston and the connecting rod. The rotary motion of the connecting rod relative to the piston must be compensated for at the bearing locations of the piston pin, in the pin boss, and the small end bore.

What is the piston skirt?

A thin cylinder of material fitted at the bottom end of a piston. It serves to close the ports in a two-stroke engine.

How are 4 stroke engines lubricated?

Four-stroke engines are lubricated by oil held in an oil sump. The oil is distributed through the engine by splash lubrication or a pressurized lubrication pump system; these systems may be used alone or together. Splash lubrication is achieved by partly submerging the crankshaft in the oil sump.

What are the types of lubrication?

There are 4 types of lubricants: Oil, Grease, Penetrating Lubricants, and Dry Lubricants. The 2 most common lubricants you’ll be dealing with daily are oil and grease, however, your facility will still be using dry and penetrating lubricants.

Where is hydrodynamic lubrication used?

Hydrodynamic lubrication is a term that defines a situation in which two rubbing surfaces are separated by a thin film of a lubricant. This situation is often beneficial and lubrication is used to reduce friction and/or wear of rubbing solids with the aid of liquid (or semi-solid) lubricant.

What are the 3 stages of hydrodynamic lubrication?

There are generally three lubrication regimes: full film lubrication in which the two surfaces are separated completely from each other by the fluid film resulting in lower friction coefficient; boundary lubrication in which surfaces are in contact directly leading to higher friction coefficient; and mixed lubrication.

What type of lubrication can be broken down into two forms?

Full-film lubrication can be broken down into two forms: hydrodynamic and elastohydrodynamic. Hydrodynamic lubrication occurs when two surfaces in sliding motion (relative to each other) are fully separated by a film of fluid.

What type of lubrication is best for the engine?

The most popular lubes are usually moly-based (Molybdenum Disulfide) and are designed to operate at high temperatures. Newer compounds are manufactured with additives that hold up better under extreme pressures and also act as rust inhibitors much like the compound Cosmoline.

What is lubricant example?

Common examples of internal lubricants include fatty alcohols, esters (low esterification), and EVA wax. External lubricants provide metal release and help reduce process temperature. Common examples of external lubricants include PE waxes, paraffin, metal soaps, esters (high esterification), amides, and fatty acids.

How do I lubricate my engine?

The process of lubrication in an internal combustion engine begins in the sump, commonly referred to as the oil pan. From here, the oil is pulled through a strainer, by the oil pump, removing larger contaminants from the mass of the fluid. The oil then goes through the oil filter.

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