improve the assembly quality.

Describes the back-paired single row tapered roller bearing clearance method for determining the zero introduced three kinds of zero-clearance under the inner spacer width measurement method and a comparison of their results show that: 7SN3 is an accurate measurement of the appropriate method, and the method of three errors in the measurement process were analyzed, and the corresponding solutions to improve the assembly quality.
Tapered roller bearing lubrication system design is unreasonable, or other causes may lead to insufficient lubrication of bearings early failure, presented by improving the bearing inner ring large rib structure to improve the bearing lubrication performance of specific methods.Crossed roller bearings by the Luoyang Bearing Co., Ltd. specializes in producing Bo Ying, cross roller bearing is characterized by two roller clutch bearing  two rows of staggered rollers. With conventional thrust bearing and radial bearing assembly compared to the centering, cross roller bearings, compact structure, small size, and simplifies the design of workstations, thereby reducing the cost of the turntable.
Further, the use of optimized preload, these bearings have a high rigidity, and therefore the rigidity and precision of the turntable are guaranteed. Thanks to two-row crossed roller design, the effective span of the bearing can be significantly improved, so these bearings have a high resistance to overturning moment. In cross roller bearings, is divided into two types: the first one is a cylindrical cross roller bearings, the second is tapered cross roller bearings. Typically, cylindrical cross-price ratio tapered roller bearings Crossed roller bearings is low, for a relatively low speed turntable applications; while tapered cross roller bearings tapered roller using a pure rolling design, with high running accuracy, speed capability strong, reducing the shaft length and processing costs and other advantages. Crossed roller bearings are suitable for all types of vertical or horizontal boring machine, as well as vertical mill, vertical lathe and large gear milling applications.