ESE cylindrical roller bearing
Cylindrical roller and the raceway is in line contact bearings. Load capacity, the main radial load. Rolling ring wall friction small, suitable for high-speed rotation. According to ring without ribs, it can be divided into NU, NJ, NUP, N, NF and other single row ESE cylindrical roller bearings, and NNU, NN and other double row cylindrical roller bearings. The bearing is the inner, outer separable structure.
Inner or outer wall of the ESE cylindrical roller bearings, the inner ring and outer ring can be relative to the axial movement, so it can be used as a free end bearings. On either side of the inner and outer double wall, rings the other side there is a single wall of ESE cylindrical roller bearings, can withstand a certain degree of axial load direction. General use of steel stamping cage, or copper alloy solid cage. But there are also part of the use of polyamide forming cage.
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 close to 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 detachable, easy installation and removal.
Cylindrical roller line contact with the raceway, large radial load capacity. Both to withstand heavy load and impact load, but also for high-speed rotation.
ESE cylindrical roller bearing raceways and rolling lanes geometry. After the improved design, with high load carrying capacity, the new design ribs and roller end, not only improves the axial bearing capacity, while improving the roller end wall contact areas and lubrication conditions, improved performance of the bearing.
Type of construction
Type 1 bearing structure. No outer wall and inner wall N0000 type NU0000 type, ESE cylindrical roller bearings acceptable such large radial load bearing, high speed limit, not bound by axial displacement of shaft or housing, can not accept the shaft to load.
2. ESE cylindrical inner and outer wall with roller bearings NJ0000 type, NF0000 bearing can be bound in one direction or the axial displacement of the housing, and can accept a smaller axial load. NU0000 + HJ0000 type, NJ0000 + HJ0000 type, NUP0000 bearings, axial displacement can be bound or two in the axial direction of the housing gap in the field of bearings, and can accept a smaller two-way axial load.
ESE four cylindrical roller bearings ESE cylindrical roller bearings are separable bearings, installation and removal is very convenient. ESE cylindrical roller bearings can withstand greater radial load and apply to the use of lead in high speed applications.
These bearings allow the axis of the inner ring and outer ring axis angle error (inclination) is very small, only 2 'to 4'. Therefore, the shaft and housing is relatively high machining accuracy otherwise, likely to occur in parts of the uneven loading raceway contact or stress concentration. But the pair of rollers or raceway contact correction buses can reduce stress concentration conditions.
ESE cylindrical roller bearings depending on the number of columns fitted with rolling elements can be divided into single row, double row and multi-row ESE cylindrical roller bearings and other different structures. Different bearing structure design is also reflected in the position of ribs. ESE which are commonly used cylindrical roller bearings have the following forms:
ESE single row cylindrical roller bearings: ESE single row cylindrical roller bearings are separable bearings, easy installation and removal, two rings may be a tight fit, the contact line corrected between rollers and raceways can reduce the stress concentration .
ESE double row cylindrical roller bearings: ESE double row cylindrical roller bearings are swimming bearings, the separability makes installation and removal easy. Two rings can be a tight fit. ESE double row cylindrical roller bearings almost not allowed to have an inclination angle.
ESE single row cylindrical roller bearings N, NU type
N-type bearing outer ring without ribs, on both sides of the inner ring has a rib. It can allow the shaft relative axial displacement in both directions between the housings. NU type bearings on both sides of the outer ring ribs, no inner wall. It can also allow the shaft relative displacement in both directions between the axial bearing. Therefore, the class structure is suitable for use as a swimming end bearings.
NJ, NF type
NJ-type bearing outer ring on both sides have ribs, the inner wall of unilateral there. It can withstand a certain amount of axial load. NF-type outer unilateral have ribs, on both sides of the inner ring has a wall. It can withstand a certain amount of axial load. Therefore, the class structure is suitable for use as a one-way axial positioning bearing.
NUP, NFP type
NUP type bearing wall on both sides of the outer ring, the inner side of the band (fixed) single-wall, while the other side is detachable flat rings. It can withstand a certain amount of axial load.
NFP type of bearing outer side of the belt (fixed) single-wall, while the other side is detachable flat ring, both sides of the inner ring wall. Also can withstand a certain amount of axial load. Class structure bearings can limit the shaft relative to the housing axial displacement in both directions. Thus, suitable as a fixed end bearings.
NH (NJ + HJ) type
NH-bearing structure bearing NJ with HJ thrust collar the combined type. Since NUP type bearing inner ring is shorter, plus the flat ring is not fixed, inconvenient to use, and can use NH-bearing NJ-type bearing the entire width of the inner ring, keeping a closer fit with the shaft. And NH-bearing during installation and removal easier.
NH-type bearings can limit the shaft relative to the housing axial displacement in both directions. Thus, suitable as a fixed end bearings.
Double row bearings
ESE double row cylindrical roller bearings double row cylindrical roller bearings ESE structure, there are two cylindrical bore and tapered bore (bearing post code plus K). This kind of bearing has a compact, rigid, large carrying capacity, deformation, etc. After that load, especially for machine tool spindle bearing. Tapered bore can also play the role of micro-adjusted clearance and positioning device can be simplified structure, easy installation and removal. ESE usual double row cylindrical roller bearings under the following forms: 
NN, NNU type
NN-bearing outer ring without ribs on both sides of the inner wall has a wall in the middle. It can allow the shaft between the bearing relative axial displacement produce two directions.
NNU type bearings on both sides of the outer ring has a wall in the middle ribs, no inner wall. It can allow the shaft between the bearing relative axial displacement produce two directions. Therefore, such a structure suitable for swimming end bearings. This type of bearing retainer multi-use vehicle solid cage.
NNF bearings are double row full ESE cylindrical roller bearings, the outer wall consists of a band, there are two types of double-wall inner ring structure. Roller guided by the inner ring wall, two inner fastening ring together. In addition to the structure can withstand large radial loads and axial loads, but also can withstand the overturning moment, therefore, often used as a fixed end bearings.
NNF bearing type contact seals on both sides. Bearing filled with grease, grease operating temperature of -50 ℃ to + 110 ℃, but due to restrictions by the sealing material, bearing operating temperature is limited to between -40 ℃ to + 80 ℃. In the case of the use of better working conditions, NNF bearings with sealed without the need for maintenance, if bearing a long period of moisture or pollution of the environment, and is in high-speed operation, through the oil tank and lubrication holes on the outer ring of the bearing relubrication.
ESE Four row cylindrical roller bearings Four-row cylindrical roller bearings ESE is mainly used for cold, the hot rolling mill, billet rolling mill and other machinery, bearings for the separation structure, bearing rings and rolling element can be easily separated, Therefore, the bearing of cleaning, inspection or disassembly are very easy to install.
FC bearing consists of two outer and an inner composition, both sides of each outer wall in the middle of the wall there, no inner wall.
FCD-bearing is actually a combination of two NN type bearings made.
FC type and FCD-bearing allows the shaft between the bearing relative axial displacement produce two directions. Therefore, such a structure suitable for swimming end bearings. This type of bearing retainer multi-use vehicle system entities 13:58.
Medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gear boxes, rolling mill, vibrating screen, and lifting transportation machinery.
ESE cylindrical roller bearings PO, P6, P5, P4, P2. Accuracy level from low to high in turn divided sorted accuracy class.
ESE cylindrical roller bearings Radial clearance adjustment:
ESE cylindrical roller bearings selection quick and easy selection Daquan provide superior automation, synthetic fixed radial load on the load of the load from the local ring raceway fixing ring exposed, and transferred to the corresponding shaft or bearing local. This load is characterized by a relatively static radial load vector synthesis and ring. Bear the load ring, you can use the relatively relaxed.
Rotating load is a synthetic radial load full complement cylindrical ESE acting on the circumferential direction of the rotation of the drum roller bearing rings, each part of the revolution, such as the burden of the rotation, which is made of a synthetic vector phase rotating ring radial load, commitment. In close cooperation with the rotating load ring, in exceptional circumstances, the load, if elected, is light or heavy loads at low speeds, only occasionally ring, bearing a hard material and high surface roughness, rotating load bearing ring can also be It used more loosely.
Third load oscillating load or non-directional load, load ring radial load of synthetic direction uncertain, it is characterized by a ring radial load vector raceway role, impact load in a certain area, vibration, load, and the direction is swing roller to bear a certain area, or acting on the bearing load, load values change frequently. To bear the load swing, outer ring and weeks, bearings, holes should work closely together to use.
Bearing radial clearance methods commonly used to adjust the full complement cylindrical roller ESE as follows:
1, cylindrical and oval bearing backlash, can be manually scrape or bearing equatorial plane after turning padded scratch repair method of adjusting.
2, cylindrical and oval bearing the headspace, can be hand-scrape method or circumstances permit bearing the equatorial plane padded adjustments.
3, for more oil wedge fixed bearing, in principle, allow repair scratch and adjust the bearing clearance, the gap should be replaced with new tile inappropriate.
4, for more oil wedge tilting bearing, does not allow repair scratch pad, the gap should be replaced due to inappropriate tile. The thickness of the adjustable tile, tile can be adjusted by the amount of the adjustment in the next block behind tile plus stainless steel pad, thickness or thinned adjustment block approach. Note for more oil wedge tilting bearing, among the same group of tile thickness error should be less than 0.01mm.
In normal use, the vibration of the bearing damage is very sensitive, peeling, indentation, corrosion, cracks, wear, etc. will be reflected in the bearing vibration measurement. So, through the use of special bearing vibration measurement device (frequency analyzer, etc.) to measure the size of the vibration, the frequency distribution can be inferred by abnormal circumstances. The measured values due to the use of conditions or bearing sensor installation location, etc., and thus requires prior to each machine measurements were determined after analysis and comparison criteria.
Terms of temperature
High temperature frequently expressed ESE cylindrical roller bearings are in an abnormal situation. High temperature is also harmful to the bearing lubricant. Sometimes bearing overheating can be attributed to the bearing lubricant. If the bearing temperature over 125 ℃ even move to reduce long-term bearing life. Causes high temperature bearings include: lack of lubrication or excessive lubrication, bearing raceways containing impurities, the speed limit is too high, bearing long-term overload and so on.