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Common terms and definitions of rolling bearings 1. Bearing: (1) Overview of rolling bearings 1. Rolling bearing rolling bearing A bearing that performs rolling motion between parts that support loads and move relative to each other. It includes parts with raceways and rolling element groups with or without isolation or guides. Can be used to bear radial, axial or combined radial and axial loads. 2. Single row bearing is a rolling bearing with one row of rolling elements. 3. Double row bearing is a rolling bearing with two rows of rolling elements. 4. Multi-row bearing: A rolling bearing with more than two rows of rolling elements that bears loads in the same direction. It is best to indicate the number of rows and bearing type, such as: "Four row radial cylindrical roller bearings". 5. Full complement bearing: A bearing without a cage. The sum of the circumferential clearances between each row of rolling elements is less than the diameter of the rolling elements and is as small as possible, so that the bearing has good performance. 6. Angular contact bearing is a rolling bearing with a nominal contact angle greater than 0° and less than 90°. 7. Self-aligning bearing: One raceway is spherical and can adapt to the angular deviation and angular movement between the two raceway axis lines. 8. Separable bearing A rolling bearing with separable parts. 9. Non-separable bearing: A rolling bearing in which the bearing rings cannot be separated freely after final assembly. Note: No additional abbreviated terms are specified for bearings with different methods of separating parts, such as ball bearings with double half rings (02, 01, 08). 10. Inch bearing is a rolling bearing whose outer dimensions and tolerances were originally designed in imperial units. 11. Open bearing is a rolling bearing without dust cover and sealing ring. 12. Sealed bearing is a rolling bearing with sealing rings on one or both sides. 13. Shielded bearing is a rolling bearing with a dust cover on one or both sides. 14. Capped bearing: A rolling bearing with one or two sealing rings, one or two dust covers, a sealing ring and a dust cover. 15. prelubricated bearing: a rolling bearing that has been filled with lubricant by the manufacturer. 16. Instrument precision bearing is a special rolling bearing for instruments. 17. Matched bearing is a pair or group of rolling bearings. (2) Radial bearings 1. Radial bearings are mainly used for rolling bearings that bear radial loads. Their nominal contact angles are between 0° and 45°. The basic parts are inner rings, outer rings and rolling elements with or without cages. 2. Radial contact bearing radial contact bearing is a radial rolling bearing with a nominal contact angle of 0°. 3. Angular contact radial bearing angular contact radial bearing is a radial rolling bearing with a nominal contact angle greater than 0° to 45°. 4. Insert bearing is a radial rolling bearing with an outer spherical surface and a wide inner ring with a locking piece. Mainly intended for simple shell use. 5. Tapered bore bearing is a radial rolling bearing with a tapered bore in the inner ring. 6. Flanged bearing: A flanged bearing is a radial rolling bearing with an outer radial flange on one of its rings, usually an outer ring or a conical outer ring. 7. Track roller (rolling bearing) A radial rolling bearing with a thick-section outer ring that rolls on a guide rail as a wheel, such as a cam guide. 8. Back-up ring type track roller (rolling bearing) Yoke type track roller (rolling bearing) A roller rolling bearing equipped with a pair of flat back-up rings. 9. Universal matching bearing: When one or more sets of the same radial rolling bearings are selected and used together, the characteristics specified in advance for pair or group installation can be obtained. (3) Thrust bearing 1. Thrust bearing thrust bearing is mainly used for rolling bearings that bear axial load. Its nominal contact angle is greater than 45° to 90. The basic parts are shaft rings, seat rings and rolling elements with or without cages. 2. Axial contact bearing a * al contact bearing is a thrust bearing with a nominal contact angle of 90°. 3. Angular contact thrust bearing is a thrust rolling bearing with a nominal contact angle greater than 45° but less than 90°. 4. Single direction thrust bearing is a thrust rolling bearing that can only bear axial load in one direction. 5. Double-direction thrust bearing is a thrust rolling bearing that can bear axial load in two directions. 6. Double row double-direction thrust bearing