The bearings how to match? A lot of people choose the wrong!

The bearings how to match? A lot of people choose the wrong! 2019 - 06 - 13 FAG bearing 7308 b is single row angular contact ball bearings, can take effect in one direction of axial load and radial load. Used usually in pairs installation configuration on the device. Carry axial load capacity size depends on the contact Angle, the contact Angle, the greater the bearings can withstand axial load. Models in the suffix B on behalf of the bearing contact Angle of 40 & deg; Can bear a large axial load. This kind of bearing is inseparable bearing, maintains frequently use the materials such as nylon, stamping steel or brass. FAG such angular contact ball bearing has universal modular design, the suffix with UA, UL or UO, can be used for X, O arrangement, or in the series arrangement with groups. These bearings can meet the needs of any installation form, but for the tandem arrangement, outer end face must ensure that there is enough support. UA - On behalf of small axial clearance UL - On behalf of the light preloading UO - bearing group On behalf of X, O arrangement zero clearance bearing group of this kind of bearing in the process of ordering, who ordered by a single set of bearing, bearing the total number must show, not only provide the order number of bearing or bearing group. Paired bearing are provided with no baffle type O arrangement ( The suffix for DB) , X ( The suffix for DF) Or (in the series arrangement The suffix for DT) The bearing group. When ordering bearings, must indicate the number of the bearing group, rather than the number of single bearing. Bearing suffix symbols that see table: O arrangement of bearing bearing universal modular design bearing of X type is decorated in addition to normal levels of suffix for UA, UL or UO angular contact ball bearings ( No said tolerance grade of the code in the suffix) 。 The protocol can also provide the tolerance level for P5 universal combination design of angular contact ball bearing ( The suffix for P5 - UL or P5 - UA) 。 Exceptions: all the tolerance grade of bearing inside diameter tolerance level for P5 precision ( No special suffix) , pairing of universal modular design of the bearing and bearing the width of the tolerance, please see the table below. Universal modular design USES X, O arrangement of 70 b, 72 b and 73 b series of angular contact ball bearing internal axial clearance or preload value, as shown in the table below. Internal axial clearance is zero or negative clearance of the product is not suitable for tight fit after installation of bearing group. Tight fit makes installation of bearing axial clearance in pairs decrease or increase pre-tightening force. Internal axial clearance and preloading see table: internal axial clearance or preload tolerance as shown in the table below: summary, FAG company 7308 b can realize bearing models have 7308 pairs using bua, UL, UO universal equipping design products ( Sure a good way of equipping and use requirement, a single purchase) ； You can also choose 7308 BDB, DF and DT group buy ( Equipping manner determined by the buyer) 。 Option in the user's hands, but must choose the right! ！ ！ When using matched bearing, bearing can install on tight to each other, do not need to adjust. Or by selecting the proper preload bearing clearance group, and between the shaft and bearing the appropriate tolerance matching, can be preloaded or required for clearance. To make bearing play its performance, and is capable of reliable operation, must be properly adjust or select the appropriate pre-tightening or clearance. If the bearing work clearance is too large, will not be able to make full use of bearing load capacity, but too much preload will lead to increased friction and working temperature rise, and thus shorten the working life of the bearing. Should pay special attention to in back to back and face-to-face bearing configuration, if the main effect of axial load in one direction, for in the absence of bear in the ball bearing, is a bad rolling conditions, and can lead to noise, and damage to oil film and increase cage under stress. Hk united bearing focus bearing industry informationization service nearly 20 years, with many excellent bearing enterprise grows together, also witnessed China's bearing production technology from low to high development process. We will adhere to continue, the steadfast work, don't, don't give up, for the benign development of Chinese bearing industry do render some. Hk united bearing network bearing engineers, 2018. 12. 12