Bearing standard specification and common problems

Bearing source of standard specification and common problems: bearing | last updated: - 2020 10 - 19 bearing standard specification and common problem 1, selection of bearings and shaft hole base system, non-standard bearings and the mutual cooperation choose basic shaft casing. Standard tolerance and rotation accuracy of bearing shall conform to the gb307 - The requirements of 84. 2, the motor shaft in conjunction with the bearing and bearing box hole by GB1031 - 83, motor shaft surface roughness Ra value is lower than 1. 6 microns, bearing box in the hole surface roughness Ra value is lower than 2. 5μm。 3. Made of gcr15 and zgcr15 steel bearing ring and roller bearing, the strength of the sprocket wheel and the roller bearing should be 61 - 65HRC； When using gcr15simn and zgcr15simn steel, strength should be 60 - 64hrc。 The strength of the inspection methods on the same part and shall comply with the requirements of JB1255 strength. 4. Check the axial clearance of bearing and the radial clearance in accordance with GB4604 - The requirements of 84. 5. Bearing inner and outer ring raceway can not fall off, relatively serious damage to the bearing outer ring may not be broken, bearing outer ring shall not be broken, and shall not destroy the steel ball, shall not damage more serious distortion of bearing, can not have ball bearings, can not have ball bearings, must not have abnormal noise and rotational vibration, and must be at the end stop slowly. 6. For size tolerance for class C of tapered roller bearings, to a certain load, under the action of using coloring method to examine the roller bearing with sling ring raceway contact between accuracy and contact tag should be continuous, contact length should not be less than 80% of roller bushing. Also browse reading this article: how to increase the service life of bearing life of bearing is related to manufacturing, installation and application are inseparable, at least do a good job in every stage, can make the bearing in the best operating condition, thus increase the bearing life. 1. The choice of shaft and bearing chamber size tolerance and operation: after the bearing pressure into the bearing, should be able to turn easily, without conduction block. If there is a obvious rotation is not convenient, the specifications of the shaft is too big, should reduce size tolerance. Such as bearing pressure into the shaft after his rotation has significant 'hissing' feeling, may be shaft dimension tolerance is large or shaft concentricity is not very good. As a result, the bearing and bearing housing size tolerance control, must have good concentricity, many Chinese manufacturers only at this stage of dimensional tolerance, not concentricity to operate. 2. Bearing installation method: because the bearing is high precision products, such as installing a bad easily damaged bearing section, damages to the bearings, the bearing damage. Bearing installed at special shells, not casually tapping. According to the last only circle stress, press circle only big circle stress. When installing a standard pneumatic or hydraulic press, when riveting around extroversion, if deflection can lead to bearing cross-section bearing damage, and bearing pad. 3. Prevent dirt installation: when the bearing is placed in the motor rotor on the rotor dynamic balance, it is easy to rotor dynamic balance caused by iron pin into the bearings, so it's best to ready before installation of bearing rotor dynamic balance. Some manufacturers in order to convenient installation, install or vegetable oils in bearing interior to wetting effect, but the actual operation personnel is difficult to control the number of bearing indoor or vegetable oils, if you have any more or vegetable oils, bearing the indoor bearing rotation is easy to follow the shaft into the bearing. The bearing chamber had better not oil or vegetable oil. If necessary, should operate, not accumulated in bearing chamber. 4, paint, rust preventing: rust paint is characterized by multiple in sealing type motor, motor noise when installation is very good, but put some time in the warehouse, motor noise is very big, tear open come down to the bearing has a serious corrosion condition. Many manufacturers think before is the bearing problem. After constant propaganda and planning, motor factory has realized mainly is a question of anti-corrosion paint. The key question is the acid in three anticorrosive coatings under certain temperature and humidity will produce corrosive chemicals. This problem at this stage only with good anti-corrosion coating, and install natural ventilation after a certain period of time after airing.