Learn the basic knowledge of bearing installation, again

A, clear bearing model of bearing model representation of the basic size of bearing, the original clearance, cage type, sealing, lubrication requirements, etc. , so before starting the installation must be explicitly bearing model is correct. B, bearing the positioning of a shaft in order to smooth running, generally there are at least two fulcrum for axial and radial support, each fulcrum of at least one or more bearings. In general, a bearing role positioning, another bearing can't afford to the location of role. Under special circumstances, the two bearing positioning role at the same time. Locating bearing radial support and axial orientation. Locating bearing, therefore, must be fixed on the shaft and the bearing chamber at the same time. Deep groove ball bearing, spherical roller bearing, double row angular contact ball bearings, single row angular contact ball bearing in pairs can be used as a locating bearing. Pairs of tapered roller bearings can also be used. Without flange cylindrical roller bearing and thrust bearing of the radial clearance is tie-in, can also be used as a locating bearing. The positioning bearing radial support only, its axial must be mobile. The axial movement can be generated by the bearing itself ( For example, a cylindrical roller bearing) , also can be bearing inner ring or outer ring and its relative motion between the support. Cross locating bearing can be in at least one direction at the same time carry axial load of ball bearings, or roller bearings. Note that only is insufficient in bearing radial orientation, the positioning bearing, shall be fixed in axial and size at the same time. A rolling bearing, bearing of tolerance matching all standards of inner hole and outer diameter tolerance have international standardization. In order to obtain appropriate installation with ( Interference, transition or clearance fit) , can be used in accordance with the ISO standard engineering or engineering table to select appropriate axis bearing of tolerance. For the use of bearing, people use only a small part of the tolerance level. For standard according to the difference of normal work of bearing, the precision of the corresponding bearing hole should be at least IT7 level, and should achieve IT6 level on the shaft. For the installation of set set of the occasion, or withdrawal of precision level can be low ( IT9 level or IT10 level) 。 Bearing inner hole and shaft and bearing outer ring and the composition of the bearing ( Coordinate value range), When the equipment is designed in general has been given, before installing the bearing general should according to standards of equipment use manual gives verification and confirmation, if is beyond the scope of design or tolerance, should stop work and corresponding equipment resume before they can continue to work. For the protection of the equipment did not give a tolerance should refer to the corresponding form. Bearing inner hole and shaft with see SKF bearing maintenance manual pages 284 and 285, with the bearing outer ring and bearing see SKF bearing maintenance manual pages 300 and 301. For the measurement of bearing, every part should choose three parts measurement, measurement (at four o 'clock See the attachment) record form 。 B, bearing the original clearance and the rest of the clearance of bearing itself in axial and radial clearance process has been determined ( With C1 / C2 / C0 / C3 / C4 / C5 / said) 。 Reduce the remaining gap bearings after installation, since we started running on the device, as temperatures rise, the gap will be further is less, but always maintaining a slight positive. The best remaining gap will ensure the longest bearing life. Gap is too big or too small will affect the bearing of life. For cylindrical bore bearing, the remaining gap is determined by the bearing and shaft dimension ( The greater the amount of interference, the smaller the remaining gap) 。 For tapered bore the bearing, the remaining gap is determined by installing the firmness of ( Install the tighter, the smaller the remaining gap) 。 For cylindrical bore bearing, the remaining gap mainly by bearing cooperate to guarantee its installation position, so before installation must be carefully measure the size of the installation position. For cone bearing, the remaining gap is dominated by installation of firmness, so during the installation process should strictly abide by the relevant gap control standard. C, bearing the clean bearing before installation must clean, carefully and use compressed air to blow dry dishcloth to ban the use of fluff. D, clean site and clean unclean will lead to a foreign body into the lubricating oil or grease bearing moving parts, thus resulting in abnormal bearing damage. Under normal circumstances, the oil film between the moving parts is only 0. 1 ~ 1 micron, and a dust particle size is 10 times as much as it is even greater. These particles cause stress concentration and bearing damage in advance. Jiaxing seiko co. , LTD. , professional motor bearing application solutions provider focused on miniature bearings, motor bearings, deep groove ball bearing telephone: fax: an article on the info @ : bearing failure analysis in the next article: cause of fever and treatment methods