The cylindrical roller and raceway are linear contact bearings. The load capacity is large, mainly bearing radial load. The friction between the rolling body and the retaining edge of the ferrule is small, which is suitable for high-speed rotation. According to whether the ferrule has a flange, it can be divided into Nu, NJ, NUP, N, NF and other single row cylindrical roller bearings, NNU, NN and other double row cylindrical roler bearings. The bearing is a separable structure of inner ring and outer ring.
The inner ring and outer ring of cylindrical roller bearing without flange can move relative to the axial direction, so it can be used as free end bearing. A cylindrical roller bearing with double ribs on one side of the inner ring and outer ring and a single flange on the other side of the ferrule can bear a certain degree of axial load in one direction. Generally, steel plate stamping cage or copper alloy car solid cage is used. But some use polyamide shaped cages.
The roller of the cylindrical roller bearing is in line contact with the raceway, so the radial load capacity is large. It is not only suitable for bearing heavy load and impact load, but also suitable for high-speed rotation. At the same time, it improves the lubrication conditions of the contact area between the roller end face and the retaining edge, and improves the service performance of the bearing. Bearing wechat is very worthy of attention! Generally, it is suitable for large and medium-sized motors, locomotives, machine tool spindles, internal combustion engines, generators, gas turbines, reduction boxes, rolling mills, vibrating screens, hoisting and transportation machinery, etc.
Bearing characteristics
1. The roller and raceway are in line contact or repair line contact, with large radial bearing capacity, suitable for bearing heavy load and impact load.
2. Small friction coefficient, suitable for high-speed, limit speed close to deep groove ball bearing.
3. N-type and nu type can move axially, which can adapt to the change of relative position between shaft and shell caused by thermal expansion or installation error, and can be used as free end support.
4. The processing requirements for the shaft or seat hole are high. After the bearing is installed, the relative deflection of the outer ring axis shall be strictly controlled to avoid contact stress concentration.
5. The inner or outer ring can be separated for easy installation and removal.
Product characteristics
The cylindrical roller is in line contact with the raceway and has large radial load capacity. It is not only suitable for bearing heavy load and impact load, but also suitable for high-speed rotation.
The raceways and rolling bodies of cylindrical roller bearings are geometric. After the improved design, it has higher bearing capacity. The new structural design of the retaining edge and roller end face not only improves the axial bearing capacity of the bearing, but also improves the lubrication conditions of the contact area between the roller end face and the retaining edge, and improves the service performance of the bearing.
Accuracy grade
Cylindrical roller bearings can be divided into Po, P6, P5, P4, P2 according to the accuracy level. The accuracy level can be sorted from low to high.
Structural form
1. This kind of bearing can accept larger radial load, high limit speed, no binding axial displacement of shaft or shell, and can not accept axial load.
2. The cylindrical roller bearings nj0000 and nf0000 with both inner and outer ring ribs can restrain the axial displacement of the shaft or the shell in one direction, and can accept small unidirectional axial load. Nu0000 + hj0000, nj0000 + hj0000 and nup0000 bearings can restrain the axial displacement of shaft or shell in the axial clearance field of imported bearing. And it can accept small bidirectional axial load.
