User talk:Loranmziri

Lubrication
1. Introduction: Lubrication is the control of friction and wear by the introduction of a friction-reducing film between moving surfaces in contact. The lubricant used can be a fluid, solid, or plastic substance. Although this is a valid definition, it fails to realize all that lubrication actually achieves. Many different substances can be used to lubricate a surface. Oil and grease are the most common. Grease is composed of oil and a thickening agent to obtain its consistency, while the oil is what actually lubricates. Oils can be synthetic, vegetable or mineral-based as well as a combination of these.

Lubrication can be defined as the application of some materials between two objects moving relative to each other to allow smooth operation as much as necessary. Either oil or grease is used for rolling bearings to prevent noise, wear and tear, and heat from being generated from their rolling and sliding movements, and in some special cases, solid lubricants are occasionally used. The amounts and kinds of lubricants for rolling bearings are determined depending on operation speed, temperature, and surrounding condition, and so on. Because lubricants have spent their service-life or polluted with foreign materials, they cannot serve their function well hence they have to be periodically replaced or oiled. 2. Grease lubrication : Grease is a semi solid lubricant. It is a mixture consisting of natural or synthetic oil base combined with thickeners and additives. It generally consists of a soap emulsified with mineral or vegetable oil.The National Lubricating Grease Institute (NLGI) defines grease as ‘a solid to semi-solid product of dispersion of a thickening agent in a liquid lubricant. Additives imparting special properties may be included, Grease is a complex lubricant which consists of base oil (65-95%), additives (0-10%) and thickener (3-30%) ; the thickener forms a network that acts as a reservoir for the oil. The most widely used grease thickeners are lithium, calcium or aluminium soaps. The soap gives the grease a semi-solid appearance and enables lubrication in applications where a continuous supply of oil is not possible. 3. Lubrication Fundamentals: Lubrication is defined as the application of lubricants to minimize friction between moving contact surfaces. Friction is the force that acts at the contact surface between two bodies which causes resistance to their between two bodies which causes resistance to their relative motion. Forced movement of adjacent surfaces can wear away the surfaces and also create heat as illustrated in Figure .Third Edition, Revised and Expanded describes the need and design for the many specialized oils and greases used to lubricate machine elements and builds on the tribology and lubrication basics discussed in previous editions. 4. Pressure lubrication system. ➢ In this system, lubrication is done with the help of pressure pump which is submerged in the sump ➢ With the help of pressure pump after filtration, oil is forced under pressure to different parts of the engine through oil tubes ➢ From the bearing oil floats to connecting rod through oil holes between connecting rod and cam shaft ➢ Then this oil flows to piston pin through oil holes and sprayed over piston, piston rings ,cylinder valves and other parts Loranmziri (talk) 23:00, 4 February 2022 (UTC)