In order to give full play to the function of bearings in the machine, besides choosing the type and model matching with the system, the correct combination structure design should also be carried out. This needle bearing is the same. What are the contents of needle bearing combination design?
The combined structure design of needle roller bearings includes the support end structure of shafting, the matching of bearings and related parts, the lubrication and sealing of bearings, and the improvement of the stiffness of bearing system, which are all the goals to be achieved, otherwise needle roller bearings will not work normally.
In addition, there is also about the fixed way of needle roller bearings. If the two ends are fixed, each bearing bears a bearing directional force in one direction, which allows a small amount of thermal expansion when the shaft works. In the formal installation of needle roller bearings, there should be 0.25mm-0.4mm axial clearance, which can be adjusted by gasket or screw.
But this kind of fixing method will restrict the two-way movement of needle roller bearings, so it is generally suitable for some axles whose working temperature does not change much. When applied, the heating elongation and the compensation gap between the bearing cover and the outer end face should also be considered.
If only one end of needle roller bearing is fixed bidirectionally and the other end is kept in a swimming state, it can ensure that the bearing can swim freely when it is expanding and contracting. The fixed end of needle roller bearings is mainly the bi-directional axial force borne by a single bearing or a group of bearings. In order to avoid loosening and falling off, the internal range and axis of the floating bearings are fixed in the direction.
In the whole structure, needle roller bearings are used as swimming fulcrum, the outer ring of the bearing needs to be fixed with the seat, and the free expansion of the bearing is ensured by the swimming between the roller and the ring, so that the bearing can run normally.
