Since the popularization of mechanized production, most of the work will be done by machines, and many of these devices contain needle roller bearings, through which to ensure the operation of machinery and normal work. Fortunately, there are many kinds of needle roller bearings, so they can meet the different needs of various fields. What kind of structure does one-way needle roller bearings adopt?
One-way needle roller bearings are mainly composed of stamping outer ring and plastic cage, in which the cage can be equipped with plastic reeds or stainless steel reeds to guide the needle, while the inclined raceway and needle on the outer ring are used as locking devices. With its special structure, unidirectional needle roller bearings can be used as converters, check devices or overrunning clutches.
In the actual application process, in order to better meet our use requirements, the requirements of unidirectional needle roller bearings in the elasticity also put forward a certain standard. Because the contact area between rolling element and raceway of ring is very small, the contact pressure of needle roller bearing contact surface is very high when bearing is under load, especially when bearing is under large load.
In order to prevent excessive plastic deformation under high contact stress, loss of bearing accuracy or surface cracks, it is required that bearing steel for unidirectional needle roller bearings should have high elastic limit. It is understood that hardness is one of the important indicators of bearings, which is closely related to material contact fatigue strength, wear resistance and elastic limit, and directly affects the life of bearings.
Generally, the hardness of one-way needle roller bearings is usually determined by the way and size of bearing load, bearing size and wall thickness. Only when the needle roller bearings are machined to the appropriate size and shape accuracy, can the whole set of needle roller bearings have higher life and operation accuracy.
