Bearing type selection
Core Tip: With the development of the bearing industry, the bearing types are also increasing, so it is crucial for the customer to fully grasp the conditions of use of the bearing when selecting the bearing type. Next, China Bearing Network lists the main analysis items in the following table: Selection method
With the development of the bearing industry, there are more and more bearing types, so it is crucial for the customer to fully grasp the conditions of use of the bearing when selecting the bearing type. Next, China Bearing Network lists the main analysis items in the following table: Selection method
1) Bearing installation space Bearing type that can be accommodated in the bearing installation space Since the rigidity and strength of the shaft are important when designing the shaft system, the shaft diameter, that is, the inner diameter of the bearing, is generally determined first. However, rolling bearings are available in a variety of sizes and types, and the most suitable bearing type should be selected.
2) The size, direction and nature of the load bearing load [The bearing capacity of the bearing is expressed by the basic rated load, and its value is shown in the bearing size table] The bearing load is rich, such as the magnitude of the load, whether there is only radial load, axial load Whether it is one-way or two-way, the degree of vibration or shock, and so on. After considering these factors, choose the most suitable bearing type. In general, the radial load capacity of bearings of the same inner diameter is increased in the following order: deep groove ball bearings < angular contact ball bearings < cylindrical roller bearings < tapered roller bearings < spherical roller bearings
3) The bearing type whose speed can adapt to the mechanical speed [the limit value of the bearing speed is expressed by the limit speed, and its value is shown in the bearing size table] The limit speed of the bearing is not only determined by the bearing type but also the bearing size, cage type, and accuracy grade. , load conditions and lubrication methods, etc., therefore, these factors must be considered when selecting. Most of the following bearings are used for high speed rotation: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings
4) Rotational accuracy Bearing type with required rotation accuracy [The dimensional accuracy and rotation accuracy of bearings have been standardized by GB according to bearing type] Machine spindles, gas turbines and control machines require high rotational accuracy, high speed and low friction, respectively. Bearings with a precision of 5 or higher should be used. The following bearings are generally used: deep groove ball bearings, contact ball bearings, cylindrical roller bearings
5) Rigidity The bearing type that satisfies the rigidity required for the mechanical shafting [when the bearing is subjected to load, the contact portion between the rolling element and the raceway is elastically deformed. "High rigidity" means that the amount of deformation of the elastic deformation is small.] In the machine tool spindle and the final stage of the vehicle, the rigidity of the shaft must be increased, and the rigidity of the bearing must be increased. The roller bearing is subjected to load deformation smaller than the ball bearing. Applying a preload (negative clearance) to the bearing increases rigidity. This method is suitable for angular contact ball bearings and tapered roller bearings.
Common terms and definitions of rolling bearings (1)
Core tips: one. Bearings: (1) Rolling Bearings 1. Rolling Bearings Rolling bearings that support rolling loads between parts that support the load and move relative to each other, including raceways
One. Bearings: (1) Rolling Bearings General 1. Rolling bearing A bearing that rolls between a bearing and a moving part relative to each other. It includes a raceway part and a rolling element set with or without isolation or guide. Can be used to withstand radial, axial or radial and axial combined loads. 2. Single row bearing single row bearing Rolling bearing with a row of rolling elements. 3. Double row bearing double row bearing Rolling bearing with two rows of rolling elements. 4. Multi-row bearing Multi-row bearing Roller bearing with more than two rows of rolling bearings, bearing the same direction of load, it is best to indicate the number of columns and bearing type, for example: "four-row radial cylindrical roller bearing". 5. Full complement rolling bearing Full complement bearing Bearings without cage, the sum of the clearances in the circumferential direction of each row of rolling elements is smaller than the diameter of the rolling elements and as small as possible, so that the bearing has good performance. 6. Angular contact bearing An angular contact bearing with a nominal contact angle greater than 0° and less than 90°. 7. Self-aligning bearing A raceway is a spherical shape that can accommodate the angular deviation and angular motion between the two raceways. 8. Separable bearings separable bearing Rolling bearings with separable components. 9. Non-separable bearing Non-separable bearing After the final assembly, the bearing ring is not free to separate the rolling bearing. Note: Ball bearings with separate halves (02, 01, 08) for different methods of separation of parts do not require abbreviated terminology. 10. Inch bearing inch bearing Original design dimensions and tolerances in inch units of rolling bearings. 11. Open bearing open bearing Rolling bearing without dust cover and sealing ring. 12. Sealed bearing A rolling bearing with a sealing ring on one or both sides. 13. Dust cover bearing shielded bearing A rolling bearing with a dust cover on one or both sides. 14. Closed bearing Capped bearing A rolling bearing with one or two sealing rings, one or two dust caps and a sealing ring and a dust cap. 15. Lubricated bearings prelubricated bearing Rolling bearings that have been filled with lubricants. 16. Instrument precision bearing Instrument precision bearing Instrument-specific rolling bearing. 17. Assembled bearings The matched bearing is a pair of rolling bearings. (2) Radial bearing 1. Radial bearing is mainly used for bearing radial load. The nominal contact angle is between 0° and 45°. The basic parts are inner ring, outer ring and with or without holding. The rolling body of the frame. 2. Radial contact bearing radial contact bearing A radial bearing with a nominal contact angle of 0°. 3. Angular contact radial bearing angular contact radial bearing A radial contact bearing with a nominal contact angle greater than 0° to 45°. 4. Spherical bearing insert bearing A radial bearing with a spherical outer surface and a wide inner ring with locking elements. Mainly used for simple housings. 5. Tapered bore bearing A radial roller bearing with a tapered bore in the inner ring. 6. Flange bearing flanged bearing On one of its ferrules, it is generally a radial bearing with an outer radial flange on the outer ring or conical outer ring. 7. Roller (rolling bearing) A radial roller bearing with a thick-section outer ring that rolls as a wheel on a rail, such as a cam rail. 8. Retaining ring type roller (rolling bearing) yoke type track roller (rolling bearing) Roller bearing with a pair of flat retaining rings. 9. Universal matching bearing When one or more sets of the same radial rolling bearing are used together, the characteristics specified in the first pair or group installation (3) thrust bearing can be obtained. 1. Thrust bearing The thrust bearing is mainly used for bearing axial load. Its nominal contact angle is more than 45° to 90. The basic parts are shaft ring, race and rolling element with or without cage. 2. Axial contact bearing Axial contact bearing A thrust bearing with a nominal contact angle of 90°. 3. Angular contact thrust bearing An angular contact thrust bearing with a nominal contact angle greater than 45° but less than 90°. 4. One-way thrust bearing single direction thrust bearing A thrust rolling bearing that can only bear axial loads in one direction. 5. Double-direction thrust bearing A thrust roller bearing that can withstand axial loads in both directions. 6. Double row double-direction thrust bearing A two-way thrust rolling bearing with two rows of rolling elements, each column bearing an axial load in only one direction. 7. Linear (motion) bearing linear (motion) bearing A two-roller rolling bearing with a relatively linear motion in the rolling direction.
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