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Rolling bearing fit selection technique
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| Time：2016.09.01 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Bearings role is to make the static ring rolling bearing and rotating ring are stationary and part of the mount (usually bearing) and rotating part (usually axis) with consolidation, in order to achieve the load transfer and limited movement system relative to the stationary system of basic tasks in rotating state.
In the shaft and the bearing seat, the rolling bearing is required to fix its position in three directions, such as the radial, axial and tangential directions. The radial and tangential position through the tight fit of the IKO bearing mining, axial position only in a few cases the use of tight fit; general axial spacing parts, such as cover and ring to limit the axial position in the clearance range.
Choose to pay attention to the following four points:
(1) the circumferential surface of bearing rings should have good support and force uniform, in order to reduce the distortion, and give full play to the carrying capacity of the IKO bearing.
(2) rings in their mating surfaces cannot slide along the tangent, otherwise it will damage the mating surfaces.
(3) free end bearings must be able to adapt to changes in the length of the shaft and the hole of the bearing seat, which must have the ability to adapt to the axial position in a certain range.
(4) must pay attention to the IKO bearing installation and removal easy, saving time and labor costs.
Allow speed is based on the type of rolling bearing, size, precision, cage type, load, lubrication, and cooling methods, etc.. Bearing table lists the standard precision bearings in oil lubrication and grease lubrication under the allowable speed. Usually, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high speed operation.
Bearing size accuracy and rotation accuracy are based on ISO and JIS standards. For the requirements of high precision and high-speed operation of the machinery, it is recommended to use 5 or more precision bearings, deep groove ball bearings, thrust ball bearings or cylindrical roller bearings are suitable for high running precision machinery. The elastic deformation is generated when the rolling element of the IKO bearing and the contact surface of the rolling path are pressed. Some machines need to minimize elastic deformation. The roller bearing is smaller than the elastic shape of the ball bearing.
In addition, in some cases, the rolling bearing should be applied to increase the rigidity of the bearing. This procedure is usually used for deep groove ball bearings, thrust ball bearings and tapered roller bearing inner ring bias, shaft bending, shaft or bearing box varies, with errors will cause the eccentricity of inner and outer rings. In order to prevent the eccentric angle is too large, self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing is a better choice. Voice frequency and torque, rolling bearings are based on a high standard of precision manufacturing, so the noise and small torque. Deep groove ball bearings and cylindrical roller bearings used for low voice, low torque occasions with special requirements.
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