Can say, the most use of the machine, the bearings basic is to belong to the rolling bearing of this class, rolling bearing is widely used in all kinds of mechanical components of the important basis, international organization for standardization to the rolling bearing definition is: in the load bearing and each other relative motion between parts rolling (not sliding) movement of the bearing parts, it includes a groove parts and with or without isolation or guide a group of roller.
The rolling bearing general by inner circle and outer, rolling body and keep frame of thrust bearing, and outer shaft with rolling body circle rings called shaft circle, and housing or shell with rings called a circle. Because of the performance of the imported bearing grease has great influence in the industry experts also say so import bearings by including the five big grease composition. Inner circle are usually served in shaft and axis rotation together, usually in the bearing outer ring inside or mechanical parts casing up supporting role, but in some applications, there are also rotating outer, inner ring fixed or inner and outer are rotating. Roller, and outer circle between rolling, its type ball bearings, cylindrical roller bearings, needle bearing, tapered roller bearing and spherical roller bearing, rolling body size and quantity directly influence the bearing capacity of the import bearings. Keep frame will bearing, a group of roller isometric is separated, guide roller in the right orbit sport, improve import bearing load distribution and internal lubrication properties.
Bearing industry in the habit in production with "" has said," "said inner circle," the "said rolling elements," and "said the guide roller entity kept the frame," "said stamping keep frame. In order to adapt to some use requirement, some import bearings will increase or decrease some parts, such as no inner ring or; Neither inner ring and outer ring without (inner ring and outer ring the match host parts (shaft or base) instead of); No keep frame; Or take dust cover, seals and installation with tight set set of adjustment, etc.
With the development of science and technology, in order to save material and space, improving precision, lower the cost and reduce the design and production period, and meet the needs of the host, bearing is the combination and ChanYuanHua development. Bearing unit is will import bearings and bearing related parts made into an organic whole, such as car wheel bearing unit, machine tool spindle bearing unit, ball screw bearing unit, etc. Spindle bearing spindle bearing unit including, shell and some fasteners, can according to the type of machine tool, the size, the installation, precision, stiffness, rotary speed spindle bearing unit to choose and buy.