Cylindrical roller and the raceway is in line contact bearings large load capacity, mainly bear radial load. Rolling ring wall small friction, suitable for high-speed rotation. According to ring without ribs can be divided into NU, NJ , NUP, N, NF and other single row bearings, and NNU, NN and other double row bearings. the bearing inner ring, outer ring separable structure. no inner or outer wall of the cylindrical roller bearings, the inner and axially relative to the outer ring can move, it can be used as a free end bearings at one side of the inner and outer double wall, the other side of the ring has a single wall of the cylindrical roller bearings, can bear a certain degree of axial load direction. general use of steel stamping cage, or copper alloy machined cage. but there are also part of the use of polyamide forming cage.
Cylindrical roller bearings are usually guided by a wall of two bearing rings, cage, rollers and guide ring assembly consisting of a generally separable bearings. Bearing this installation and removal more convenient, especially more display when in the request, the outer ring and the shaft and the housing has an interference fit its advantages. such bearings are generally used only for radial load, only the inner, outer wall with a single row bearings can withstand relatively small axial load or intermittent larger axial load. compared with the same dimensions of the deep groove ball bearings, such bearings with greater radial load capacity, from a structural point of view, but also for high-speed rotation.
Cylindrical roller bearings Features:
1. roller and the raceway is in line contact or repair offline contacts, radial load capacity, suitable to withstand heavy load and shock load.
2. The friction coefficient is small, suitable for high speed, speed limit near the deep groove ball bearings.
3. N type and NU type can move axially, able to adapt due to thermal expansion or installation error of shaft and housing caused by the relative change in position can be used for supporting the free end.
4. shaft or housing bore machining are higher, install the rear bearing outer ring axis relative deflection should be strictly controlled to avoid contact stress concentration.
5. The inner or outer ring separable, easy installation and removal.
No outer wall or inner wall cylindrical roller bearings
NU-type cylindrical roller bearings, with two ribs on the outer ring, and the inner wall.
N-type cylindrical roller bearings, with two ribs on the inner ring, and outer ring without ribs.
NU type and N-type cylindrical roller bearings, within a certain range to allow shaft relative to the bearing housing for the bidirectional axial displacement, which can withstand the change in length caused by thermal expansion of the shaft, it is suitable as non-locating bearings which can withstand relatively large radial load, but can not bear the axial load.
Inner and outer wall with cylindrical roller bearings
NJ type cylindrical roller bearings, the outer ring of the double wall, inner single-wall.
NF type cylindrical roller bearings, the outer ring of single-wall, double inner wall.
NJ-type and NF type cylindrical roller bearings, limit the shaft or housing in one direction of the axial displacement of one-way axial positioning, and can withstand a small axial load.
NUP type cylindrical roller bearings, double-wall outer ring, the inner side wall there, the other side of the retaining ring. This kind of bearing shaft can be two-way axial positioning, can withstand two-way axial force. bearing structure type optional NUP... N. oblique collar HJ of NJ type cylindrical roller bearings as NUP type cylindrical roller bearings, can be used as a locating bearing.
No inner or outer cylindrical roller bearings without
RNU type, for the bearing without inner ring, an outer ring with a double wall, that is, without the inner NU-type cylindrical roller bearings.
RN type, as no bearing outer ring, the inner ring has a double wall.
RNU and RN-type cylindrical roller bearing type, for radial dimension restricted member, journal or housing bore surface directly as a raceway, raceway surface hardness, machining accuracy and surface quality should ferrule similar roller.
Full complement cylindrical roller bearings
Generally use double-wall outer ring, the inner single-block structure that NJ... V, NUP... V, RNU... V, etc., similar to the structure of the roller bearings with cage, compared with rated load, simple structure. in the speed and the operating temperature is not very high, better lubrication, cleanliness relatively high housing conditions, should give priority to full roller structure.
Enhanced cylindrical roller bearings
E Cylindrical roller bearings main dimensions consistent with the ordinary type, but the roller diameter, length, number has increased, so the carrying capacity will also increase accordingly.
The main purpose:
Medium-sized motors, locomotives, machine tool spindle, internal combustion engines, generators, gas turbines, gear boxes, rolling mill, vibrating screen and lifting transportation machinery.