Needle bearing with fine and long roller (
For 3 ~ 10 times the diameter of the roller length, diameter, generally no more than 5 mm)
, so the radial structure is compact, its inner diameter size and load capacity at the same time, with other types of bearing outside diameter to a minimum, especially suitable for the limited size of the radial installation supporting results.
According to the use of different occasions, can be used without inner ring of the bearing or needle roller and cage components, at this time to suit the bearing surface of the surface of the shaft and the shell hole directly as inner and outer rolling bearing surface, in order to ensure the load capacity and operation performance and you have the same ring bearing, axis or shell hole hardness on the surface of the raceway, machining accuracy and surface quality should be as a bearing ring raceway.
These bearings can bear radial load only.
Investigate its role should be to support, but that is only part of its role in supporting the essence of which is to be able to bear radial load.
Can also be understood as it is used for a fixed axis.
Is make it can only achieve a fixed axis rotation, and to control the movement of the axial and radial.
Such as motor without bearing the consequences of is can't work at all.
Because axis movement in any direction, and when the motor work should make rotation shaft only.
Theoretically impossible transmission effect, not only that, the bearing can also affect the transmission, in order to reduce the impact on the high-speed spindle bearings must implement good lubrication, some have lubrication bearing itself, called pre lubricated bearing, and most of the bearings must be lubricating oil, or operate at a high speed, not only because of friction increases energy consumption, more terrible is easy to damage the bearings.