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How to choose the type and type of bearing?

Update time:2018-08-13 Click:201

The first is the size limit. Usually the space in which the bearing can be installed is limited. In most cases, the shaft diameter (or bearing inner diameter) is limited by mechanical design or other design. Therefore, the choice of bearing type and size is determined by the inner diameter of the bearing. As a result, the main dimensions of standard bearings are based on the international standard internal diameter dimensions.

Standard bearings are available in a variety of sizes. It is best to use standard bearings when designing the mechanical device. (This design is easy to purchase from the bearing. Here is a question. Some models on the imported bearing catalogue are indeed Yes, but some non-standard bearings are not in stock in mainland China, and sometimes there will be long-term futures, so the cost of the bearing and the cost of later replacement should be considered when selecting the bearing.) The load of the bearing, the load applied to the bearing, Nature, size, and direction are changeable. Usually, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting suitable bearings. When the size of the ball and needle bearing is equivalent, the needle bearing usually has a high load capacity and withstands large vibration and shock loads.

Speed, the allowable speed is determined by factors such as bearing type, size, accuracy, cage type, load, lubrication method, and cooling method. The specified speed of the standard precision bearing under oil lubrication and grease lubrication is listed on the bearing table. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high speed operation.

Bearing tolerances, bearing dimensional accuracy and rotational accuracy are based on ISO and JIS standards. For machines requiring high precision and high speed operation, bearings with 5 or more precision are recommended. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machines with high running accuracy. Rigidity, when the bearing rolling element and the raceway contact surface are pressed, elastic deformation occurs. Some machines need to minimize elastic deformation. Roller bearings have less elastic deformation than ball bearings.

In addition, in some cases the bearing is preloaded to increase rigidity. This program is usually used for deep groove ball bearings, radial thrust ball bearings and tapered roller bearings. The shaft is bent, the shaft or bearing housing tolerance changes, and the misalignment will lead to the eccentricity of the inner and outer rings. In order to prevent the eccentric angle from being too large, automatic self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are preferred choices.嗓 Audio frequency and torque, rolling bearings are manufactured according to high-precision standards, so the sound and torque are small. Deep groove ball bearings and cylindrical roller bearings are suitable for occasions with low noise and low torque.

Installation and disassembly, some applications need to be removed and installed frequently to ensure regular inspection and inspection. Bearings that can be installed separately for the inner and outer rings, such as cylindrical bearings, needle bearings, and tapered bearings, are suitable for this application. The tapered self-aligning ball bearing and self-aligning roller bearing also simplify the installation procedure with the help of the bushing.