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Rolling contact bearing
The document provides an overview of rolling contact bearings, categorizing them into sliding contact and rolling contact bearings, with a focus on the latter which includes various types such as ball and roller bearings. It explains the structure and functionality of these bearings, including their applications based on load types and bearing designs. Various types of rolling contact bearings, such as cylindrical, spherical, and needle roller bearings, are detailed, highlighting their specific characteristics and uses.
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Rolling contact bearing
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- 2. BEARING DEFINATION Anycomponent which bears load. Any component which reduces friction between two moving parts. Any machine element which constrains relative motion to only the desired motion.
- 3. Bearing classification Mainlybearing is classified into two broad categories :- 1. Sliding contact bearing (no rolling elements are available and friction is high) 2. Rolling contact bearing/ Antifriction bearing (Rolling elements are available like ball, rollers and friction is less) Rolling contact bearing Sliding contact bearing
- 4. Types of RollingContact Bearing ACCORDING TO TYPE OS ROLLING ELEMENT :- 1. BALL BEARING 2. ROLLER BEARING I. CYLINDRICAL ROLLER BEARING II. SPHERICAL ROLLER BEARING III. NEEDLE ROLLER BEARING IV. TAPERED ROLLER BEARING
- 5. Ball androller bearing consist of an inner race which is mounted on the shaft or journal and an outer race which is carried by housing. In between inner and outer race there are balls and rollers. A number of balls or rollers are used and these are held at proper distances by retainers so that they do not touch each other. The retainers are thin strips and is usually in two parts which are assembled after the balls have been properly spaced. The ball bearings are used for light loads and the roller bearings are used for heavier loads.
- 6. Acc. To typesof load 1. Radial bearing :- in which load act in the perpendicular direction to the axis of rotation of shaft 2. Axial bearing / thrust bearing :- in which load act in the same direction to the axis of rotation of shaft
- 7. Types of BallBearing 1. Single row radial ball bearing 2. Single row radial ball bearing with tapered bore 3. Single row angular contact ball bearing 4. Single row externally aligned ball bearing 5. double row self aligned ball bearing 6. Thrust ball bearing
- 8. Types of rollerBearing CYLINDRICAL ROLLER BEARING They have greater radial load capacity Modified line contact between rollers and race ways Suitable for high speeds Due to detachable design character they have advantage of mounting inner ring and outer ring separately.
- 9. Taper roller bearing They support radial load and axial load from one direction only. The bearing are of separable type, enabling separation mounting of cups and cones. These bearings are available in various combinations as double row bearings, four row and with different cone angles for use with different relative magnitudes of radial and thrust loads.
- 10. SPHERICAL ROLLER BEARING These bearings are self-aligning bearings. The self-aligning feature is achieved by grinding one of the races in the form of sphere. These bearings can normally tolerate angular misalignment in the order of ± 2 ° and when used with a double row of rollers, these can carry thrust loads in either direction
- 11. Needle roller bearing A needle roller bearing is shown in Fig. 27.6 (c). These bearings are relatively slender and completely fill the space so that neither a cage nor a retainer is needed. These bearings are used when heavy loads are to be carried with an oscillatory motion, e.g. piston pin bearings in heavy duty diesel engines, where the reversal of motion tends to keep the rollers in correct alignment.
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