tianjin huamei bearing co.,ltd.

☆ product features
Cylindrical roller and the raceway was contact line, radial load capacity, both under heavy load and impact load, but also to high-speed rotation.
Cylindrical roller bearing raceway and rolling geometry of the body of the improved design, high carrying capacity, ribs and roller end of the structure of the new design, not only to improve the bearing capacity of the axial and at the same time improve the end-roller Contact with the wall region of lubrication, bearings to increase the use of performance.
Such bearings for medium and large electric motors, generators, internal combustion engines, gas turbines, machine tool spindle, deceleration devices, loading and unloading handling machinery, all types of industrial machinery.
★ product categories
ZWZ production of cylindrical roller bearings can be divided into the following types:

Single row cylindrical roller bearings
Double row cylindrical roller bearings
4 cylindrical roller bearings
Single row cylindrical roller bearings

NU-, N-type:
NU-double outer wall, the outer ring, and roller cage with the inner separation. N-double inner wall, the inner ring, and roller cage can be separated from the outer ring.
NU and N-axis relative to the shell to allow a certain scope to do axial movement, be able to adapt as a result of thermal expansion or installation error caused by the shaft and the relative location of the shell changes the most suitable for free-end bearings. Can not limit the shaft and axial displacement of the shell, only radial load to bear.
NJ-and-NF:
NJ-double outer wall and inner wall are single. NF-double inner wall, the outer ring has a single wall.
NF-NJ and affordable way to a certain degree of axial load.
NUP type, NH Type:
NUP outer ring with double-wall, the inner wall and there is a single-band Dang Quan, NH-double with outer wall, inner wall with a single and with Dang Quan inclined, can be installed on the outer ring and inner ring (With a full set of rollers and cage), the axis of the shell and the two directions of axial displacement limited to the bearing axial clearance limits, with the exception of radial load to bear, the bear can also be a small amount of two-way axial load . Therefore suitable for fixed-end bearing
NCL ... V type:
However, no outer wall with double-locked loop cage-free cylindrical roller bearings.
Bearing this type of aircraft has not maintained, roller with a relatively large number of the same size and other cylindrical roller bearings can withstand the relatively large radial load, but the lower speed limit. Bearing this kind of inner and outer ring can not be separated, were not installed, or limit the axis of the shell in both directions in the axial displacement of the bearing axial clearance limits.
-NB:
No wall of the cylindrical roller bearings.
The kind of inside and outside the ring had no bearing wall, the outer ring lubrication hole there, inner, and outer ring with a full set of roller cage of the three can be installed and can not limit or bearing shell of axial displacement, can not afford Axial load.
NJ ... V -
There is no single inner wall of the cage cylindrical roller bearings
Since this type of bearing cage, roller relatively large number of the same size and other cylindrical roller bearings compared to a greater radial load capacity, but a lower speed limit does not restrict or axis of the shell axial Displacement, axial loading can not afford.
NCF ... V -
There are single-wall outer ring of the cage to the heart without a short cylindrical roller bearings
Bearing this type of aircraft has not maintained, full of roller, the same size and other cylindrical roller bearings, to be capable of sustaining large radial load, but the lower speed limit.
The species may limit the shaft bearings or shell of the two directions of axial displacement in the bearing axial clearance limits.
... N-type (with stop bearing groove)
A separate part of the cylindrical roller bearings with outer ring groove stop, post code with "N", said. Stop the use of bearings in the ring will be made bearing in axial position, bearing in the shell hole to simplify the axial fastening, the shell holes can be made through-hole, thereby reducing the size of the components of the axis.
Double row cylindrical roller bearings:
-NN:
With inner wall, the wall-free outer ring. Can be installed inside the outer ring and components, limiting the axis of the shell or axial displacement, axial loading can not afford, with the same size radial single row cylindrical roller bearings compared to the larger radial load to bear.
Compact, less deformation when the load to bear, especially suitable for machine tool spindle bearing.
NN ... K type:
NN-type structure and the same, only with holes for tapered bearings for micro-adjustment of the radial bearing clearance, and facilitate the Assembly and Disassembly. The use of machine tool spindle bearing of this type will be installed in the cone axis through the inner pressure to adjust the amount of radial clearance.
NNU type, NNU ... K type:
With the outer ring wall, no inner wall. A cylindrical hole, two holes cone. Without limiting the axis of the shell or axial displacement, axial loading can not afford, with the same size radial single row cylindrical roller bearings compared to the larger radial load to bear.
NNCF type:
With inner wall of the three, with an outer wall, on a direction for axial positioning. In the outer wall on the other side with a fixed ring, bearing in order to keep together.
NNCL type:
With the three inner wall, no wall outer ring, with a stop on both sides of the ring to become separated from the non-bearing.
NNCS type:
With inner wall of the three, with the outer ring wall in the middle of the outer ring with a lock in a circle and became separated from the non-bearing. And the bearing axis to allow a certain degree of axial displacement as a free end the use of bearings.
4 cylindrical roller bearings
4 cylindrical roller bearings can withstand a lot of radial load and impact load, high-precision processing for high-speed.
Can be pressed into inner diameter roll after roll inner ring road roller and the abrasive surface at the same time, help improve the accuracy of rolling, and the installation of the bearing clearance would be free to adjust.
Most used cold, hot-rolled, billet and other machinery to open the work of the roller or roller bearing, but can also be used on other occasions.
FC: two-outer ring, the inner one, no inner wall
FCD: two-outer, inner double, no inner wall
FCDP: two-outer ring, the outer wall, but only with Dang Quan-ping, both inner ring, no inner wall

Mid-size range
ZWZ cylindrical roller bearings of the basic dimensions are listed in size datasheets,
Diameter size range: 25mm ~ 1900mm
Outside diameter size range: 52mm ~ 2300mm
Size range width: 13mm ~ 400 mm

● Tolerance
ZWZ production tolerance level P4 single, double, 4 cylindrical roller bearings, as well as the production of machine tool spindle with special tolerance level of SP, UP-class double row cylindrical roller bearings.
◇ radial clearance
ZWZ single row cylindrical roller bearings have a basic standard products group radial clearance, may also be obtained from C3, C4 group clearance.
ZWZ double row cylindrical roller bearings with standard products group C1 clearance, the cylindrical hole can also provide C2, C3 Group clearance, the bearing cone hole C2 Group also provides clearance.
ZWZ 4 cylindrical roller bearings with standard products group C3 clearance, while at the same time to provide clearance of other products group.
See the ＆#118alue of standard clearance form the foreword. Radial clearance greater than or less than the ＆#118alue of the standard bearings can be manufactured in accordance with user requirements.
◆ Cage
Single row cylindrical roller bearings used-car entities Cage, Cage punching, nylon, and other aircraft. Double row cylindrical roller bearings used-car Brass Cage, in some cases may also be obtained from nylon cage.
4 cylindrical roller bearings of the main vehicles used brass cage system, suitable for larger-size car pillars of the system entities Cage.
Cage code signs are as follows:
Stamping using aircraft, Cage's post-sign code-named J, if a variety of stamping frame structure, followed by J, J1, J2 ... that
Groove using aircraft, the post-Cage signs code-named CJ;
Brass Cage entities to adopt and maintain the aircraft's rear sign code-named M;
When the bearing diameter D> 400mm, using a steel cage entity, the post-Cage did not sign the code, but for the inside and outside the guide, the signs should be maintained at the same time frame materials and the corresponding post code to guide the way (outside the guide For A, in order to guide B).
Double row cylindrical roller bearings used brass cage entity does not sign.

□ equivalent dynamic load
Only when the radial load to bear,

P = Fr
■ equivalent static load
P0r = Fr

Cylindrical roller bearings with both inner and outer wall or Dang Quan, the radial load to bear at the same time may also bear some degree of axial load. At this time of axial load capacity depends on the end of the roller, the wall bearing capacity, speed and lubrication conditions and so on