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Four-row cylindrical roller bearings are mainly used in cold rolling, hot rolling mills, billet rolling mills and other rolling mill machinery. The bearings have a separate structure. The bearing rings and rolling element components can be easily separated
Therefore, the bearing is easy to clean, inspect or install.
NN type bearings have no ribs on the outer ring, and there are ribs on both sides of the inner ring and a middle rib on the middle. It can allow two directions of displacement between the shaft and the bearing seat in the axial direction.
NNU bearings have ribs on both sides of the outer ring and middle ribs in the middle, and no ribs on the inner ring. It can allow two directions of displacement between the shaft and the bearing seat in the axial direction.
Therefore, this type of structure is suitable as a movable end bearing.
The cages of this type of bearings are mostly made of car-made solid cages.
NNF type bearings are double row full complement cylindrical roller bearings. The bearing consists of an outer ring with a middle rib and two inner rings with a double rib. The rollers are guided by the ribs of the inner ring, and the two inner rings are fixed together by a fastening ring. In addition to bearing large radial and axial loads, this structure can also bear overturning moments, so it is often used as a fixed-end bearing. NNF bearings adopt contact seals on both sides. The bearing is filled with grease. The working temperature of the grease is -50 ° C to + 110 ° C. However, due to the limitation of the sealing material, the working temperature of the bearing is limited to -40 ° C to + 80 ° C. Under good working conditions, NNF bearings with seals do not need to be maintained. If the bearings are exposed to water vapor or polluted the environment for a long time, and they are running at medium or high speed, they can be adjusted through the oil grooves and holes on the outer ring The bearings are relubricated.
The roller and the raceway are in line contact or repaired line contact, and the radial bearing capacity is large, which is suitable for bearing heavy and impact loads.
The friction coefficient is small, suitable for high speed, and the limiting speed is close to deep groove ball bearings.
N type and NU type can move axially, can adapt to the change of the relative position of the shaft and the housing caused by thermal expansion or installation error, and can be used as free end support.
The machining requirements of the shaft or seat hole are relatively high. The relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid causing contact stress concentration.
The inner or outer ring can be separated for easy installation and removal.
Large and medium-sized electric motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, reduction gearboxes, rolling mills, vibrating screens, and lifting and transportation machinery.
China's bearing industry strength brand, 5 major production bases, 5,000 R & D and production teams, annual output of 400 million sets
The introduction of foreign high-quality materials, automatic production equipment for bearing products; spectrum analysis, vibration testing, roughness and roundness testing of bearings
More than 100 patent certificates for materials, heat treatment, processing technology and bearing design
National Enterprise Technology Center, multiple provincial high-tech enterprises, post-doctoral research workstations
Raw material of die-casting bearing steel, 3 quality inspection standards, service life up to 7 years
The inner diameter of the product is minimum 5mm, maximum 12mm, low noise, good airtightness, suitable for high speed environment
Rolling technical support team provides one-on-one service to provide you with exclusive bearing solutions within 24 hours
4-year warranty, customer service team to solve customer problems in real time, to solve your worries