What grade should the bearing size tolerance of full complement cylindrical roller bearings meet?

Time：2020.03.19  Source：Roller Bearings Suppliers

Full complement cylindrical roller bearings are designed to withstand heavy loads. At the same width, this type of bearing has a very high load carrying capacity compared with traditional caged bearings, with a small radial section, which can save space, but the speed is relatively low. In order for the bearing to work normally, the bearing must withstand a certain minimum load under continuous running conditions, that is, C / P<25. Otherwise, wear will be exacerbated due to insufficient lubrication and high-speed operation. All multi-row cylindrical roller bearings have a lubrication groove and a lubrication hole on the outer ring.

Classification of full complement roller bearings

Single row full complement roller bearings

Single-row full complement cylindrical roller bearings can withstand large radial loads and axial loads in one direction. Axial positioning can be ensured by a similarly arranged similar bearing. NCF 29V and NCF 30V series bearings have two fixed ribs on the inner ring and one rib on the outer ring. They can only bear axial loads in the direction of the fixed ribs on the outer ring. NJ23VH series bearings can withstand the axial load acting in the direction of the inner ring flange. Their rollers are fixed in the outer ring and will not come out even if the inner ring is removed. In this way, when the two ferrules are tightly fitted, they can be easily installed and removed separately.

Double-row full complement roller bearings

Double-row full complement cylindrical roller bearings can withstand large radial and axial loads as well as overturning moments. Therefore, they are long used as fixed bearings. The outer ring of the NNC 49V series bearing has a lubricating oil groove and several lubricating oil holes, which can also be lubricated in the shaft during work. NNF50B.2LS.V and NNF50C.2LS.V series bearings adopt contact seal at both ends, and the sealing ring is filled with grease. Under good conditions, grease can reach the working life of the bearing. Lubrication is provided through a grease groove and a grease hole on the outer ring. If the same bearings are installed on one shaft, the outer ring can have different speeds because the outer ring is narrower than the inner ring. This is a bit suitable for the pulley mechanism. In order to make the pulley easily fixed to the outer ring of the bearing, there are annular grooves at both ends of the outer ring of the bearing that can be fitted with elastic retaining rings.

Type of full complement roller bearing

NNF ... ADA2LSV / SL04

NNF… ADA2LSV / SL04 double-row full complement cylindrical roller bearing, with two inner rings, the two inner rings are connected by the clamping ring, can not be separated, the outer ring has a middle rib, can withstand the axial direction Load, used as a locating bearing. Due to the large distance between the two rows of rollers, it can also withstand overturning moments. The outer ring surface has two stop grooves that can be positioned axially. This type of bearing is equipped with contact seals on both sides, with lithium grease inside, and the operating temperature is limited to -40 ° C to + 80 ° C. Under certain conditions, this type of bearing does not require maintenance, but when it is running, there is water vapor or pollution, and it often runs at medium or high speed, it must be relubricated. In the case of oil lubrication, the seal ring needs to be removed, and the grease in the bearing should be cleaned. When the oil lubrication is used, the rotation speed is increased by 30%.

NNC / SL01

NNC / SL01 series full complement cylindrical roller bearings are non-sealed bearings. The outer ring is integrally split and is fixed by the connecting lock piece. Therefore, the outer ring cannot bear the axial load. The split outer ring is Exactly the same, each with a rib, can be used for axial positioning in two directions. The inner ring has three ribs. The outer ring has an oil groove and three lubrication holes. This series of bearings are usually oil lubricated.

NNCL / SL02

NNCL / SL02 series full complement cylindrical roller bearings are unsealed bearings, no ribs on the outer ring, with oil grooves and three lubrication holes. The inner ring has three ribs. A fixed ring is installed in the center of the outer ring between the two rows of rollers, which can prevent the rollers from falling out and keep the bearing as a whole. This series of bearings can allow a certain axial displacement between the shaft and the bearing seat to occur in the bearing. Because it can be used as a floating bearing

NCF ... V / SL18

NCF ... V / SL18 full complement cylindrical roller bearings, with a single rib on the outer ring and a lock ring on the side without ribs, can be used to position the shaft in one direction. The axial clearance "S" inside the bearing guarantees The axial positioning of the shaft relative to the bearing housing.

NJ ... V / SL19

NJ… V / SL19 full-load cylindrical roller bearings are used for extremely heavy loads and low-speed applications. They have self-locking roller sets. Even if the inner ring is removed, the rollers will not scatter. Therefore, this type of bearing is easy to install and remove. Can withstand unidirectional axial load for unidirectional positioning.

Bearing dimensional tolerances for full complement cylindrical roller bearings

The dimensional tolerance and geometric deviation of the full complement cylindrical roller bearing should conform to the GB / T307.1-94 (ISO492-1994) P0 tolerance level, and the normal original radial clearance CO can also be required to have C2 to C4 original radial Clearance bearing. However, the corresponding suffix should be added after the bearing code when ordering. Rubber and plastic screw extruder generally chooses C3 group clearance. Fitting tolerance can refer to the selection principle of bearing seat tolerance and the principle of shaft tolerance limit selection. The bearing allows a certain axial load. Sufficient lubrication is a prerequisite for bearing axial loads. The one-way locating bearing and the locating bearing's ribs bearing axial load must be fully supported.

For installation and removal, special attention must be paid when installing or removing cylindrical roller bearings. The installation or removal force cannot be transmitted directly through the cylindrical roller and the ring flange.