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### Bearings Classification and Working

• 1. NASEEL IBNU AZEEZ.M.P Assistant Professor Department of Mechanical Engineering Email:naseel@live.com
• 2. Bearing is a machine component which supports another machine element (known as journal). It permits relative motion between the contact surfaces of the members, while carrying the load
• 3. • Based on the Direction of Load 1. Radial Bearing Load acting perpendicular to the direction of motion of moving element 2. Thrust Bearing Load acts along the axis of rotation
• 4. • Based on Nature of Contact 1. Sliding Contact Bearing Sliding takes place between the fixed and moving element of bearing and its also known as plain bearing
• 5. 2. Rolling Contact Bearings Balls or rollers introduced between moving and fixed elements and it is also known as anti-friction bearings
• 9. 9 Journal (Sleeve) Bearings Load is transferred through a lubricant in sliding contact
• 10. 10 Journal (Sleeve) Bearings Thick-film lubrication (hydrodynamic), pressure distribution, and film thickness. hmin = minimum film thickness, c = radial clearance, e = eccentricity
• 12. Rolling Contact Bearings Rolling contact bearings are also known as antifriction bearings. The load, speed, and operating viscosity of the lubricant affect the friction characteristics of a rolling bearing. These bearings provide coefficients of friction between 0.001 and 0.002. The designer must deal with such matters as fatigue, friction, heat, lubrication, kinematics problems, material properties, machining tolerances, assembly, use and cost
• 13. Rolling Contact Bearings Rolling contact bearings are also known as antifriction bearings. The load, speed, and operating viscosity of the lubricant affect the friction characteristics of a rolling bearing. These bearings provide coefficients of friction between 0.001 and 0.002. The designer must deal with such matters as fatigue, friction, heat, lubrication, kinematics problems, material properties, machining tolerances, assembly, use and cost
• 14. Constructionofbearing The rolling contact bearings are composed of four elements. i. Outer race ii. Inner race iii. Rolling element iv. Cage of retaining ring
• 15. Roller contact bearing With its parts i. Outer ring (or) Outer race ii. Inner ring (or) inner race iii. Rolling elements iv. Cage or retaining ring Construction Diagram :
• 16. Classification of rolling bearings i. Ball Bearing • Deep groove (Conrad) bearing • Filling notch ball bearing • Angular contact bearings (AC) ii. Roller Bearing • Cylindrical bearings • Needle bearings • Tapered bearings • Spherical bearings Classified into two types
• 17. Ball Bearings Deep groove bearing  Single row of deep groove ball bearing can combinational of radial and thrust load. Load capacity is limited by the number of balls Primarily designed to support radial loads, the thrust capacity is about 70% of radial load capacity