Full complement cylindrical roller bearings

Full complement cylindrical roller bearings

Full complement cylindrical roller bearings are designed to carry heavy load. Comparing with traditional bearings with cage, full complement cylindrical bearings have much higher loading capacity. The radial cross section of the type of bearings is very small. So it can be very space-saving. However the limiting speed of the bearings is relatively lower. All the multi-row cylindrical roller bearings are with a lubrication groove and one nipple on the outer ring.

A minimal load is required (C/P<25) for the bearings to run well in succession. Otherwise wear may happen when lubrication is running out or rotating speed is high.

NCF…V type full complement cylindrical roller bearings are with a single rib on one side of the outer ring. A snap ring is on the other side which makes the shaft be stationary in single direction. The axial gap “s” inside the bearings ensures the axial displacement of shaft to the bearing housing case. For this “s” value, please consult SBI technical service.

NJ…V type full complement cylindrical roller bearings is applied under very high loads and slow rotating speed conditions. The rollers are self-locked and will not fall apart even if the inner ring is removed. Therefore, the mounting and dismantling of the type of bearings are convenient. The bearings can carry axial load in one direction.

NNF…2LSNVY type double-row full complement cylindrical roller bearings are with two inseparable inner rings joined by a holding ring. There is a rib in middle of the outer ring. The bearings can carry axial load in both directions and be used as stationary bearings. As the distance between the two rows of rollers is big, the bearings can also take some overturning moment. On the outer ring there are two snap grooves for axial orientation. This type of bearings is with contact seals on both sides and with lithium based grease. The operating temperature limit for the bearings is from –40 to 80

℃ . The kind of bearings is generally free of maintenance under some certain conditions,. But in case that there is vapor or dust, and the bearings are running in medium or high speed, supplement lubricant is absolutely necessary. If using rare oil as lubricant, the seals should be removed and all the grease within the bearings be washed out. In that case, the limit rotating speed can be increased 30%.

The dimension tolerance and geometry deviation of the type of bearings are in accordance with Grade P0 of GB 307.1-1994(ISO 492-1994). And the normal radial clearance is with group C0. Bearings with normal radial clearance of Group C2 or C4 are also available. In that case some suffix should be added to the bearing code. For example, bearings with group C3 are generally selected for the plastic extruders.

If you have requirement for higher grade bearings, please contact SBI service.

For mounting tolerance, you can refer to the selection principle of housing tolerance and shaft tolerance limits. Some certain axial loads are allowed for the type of bearings. In that case, sufficient lubrication is a premise. In the single direction stationary

bearings and stationary bearings, the rib that carrying axial load must be fully supported.

Attention: when mounting and dismantling the cylindrical roller bearings, the force should not be transmitted directly through the cylindrical rollers and the rib of rings.

Selecting Principle of Housing Bore Tolerance

Operating condition			Tolerance	Examples
Integrated housing	Rotating load on outer ring	Heavy Shock Load	P7	Idler, Pulley
		Normal Load	N7	Rolling wheel, Crank mechanism
		Light and Variable Load	M7	Tension wheel
	Variable load	Heavy Shock Load	M7	Eccentric mechanism, Pump
Separable or    Integrated Housing		Normal Load	K7	Compressor
		Light Load	J7	Crank Shaft
	Point Load on Outer ring	Under heavy load and normal load, for needle bearing in solid housing	J7	General engineering machine, gearbox
		Under normal load, for Needle bearing and Cylindrical roller bearing in split housing	H7	General engineering machine
		Cylindrical roller bearing at normal conditions, Under Normal Load	H8	Common bearings unit
High accuracy device		Light load. High running accuracy	K6	Main spindle of Machine tools, fixing function centric shelf

Selecting principle of Shaft Tolerance Limits

Operating condition		Shaft diameter d(mm)		Tolerance	Examples
Point Load on Inner ring	Ease to mount	from	to		Rolling wheel on static shaft: adjusting pole, inner gear in gearbox, pulley, tension wheel for rolling wheel
	General application	All		G6
				H6
Rotating or Variable load on inner ring	Light and variable load	-------	50	J6	Gearbox, main working spindle, electric motor, spindle of grinding machine, compressor, pump, machine tool, general engineering machine
		50	100	K6
		100	200	M6
		200	------	N6
	Normal load	-------	50	K6
		50	150	M6
		150	200	N6
		200	500	P6
	In poor working conditions and with shock heavy load	------	150	N6
		150	-------	P6

Note: The housing bore tolerance indicated in the table only applies to steel or casting bearing housing. The shaft tolerance only applies to solid shaft. In case of light metal housing, tighter mounting tolerance should be selected. Because of the influence of various factors, it is impossible to find a selecting principle that can include all the factors and the proper mounting tolerance. Therefore, the values indicated in the table are only for reference.

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SKET^® BEARING is a professional manufacturer and supplier of tapered roller bearings in China.

We are a learning enterprise and we keep developing new products to meet market demands. Now our bearings are used by Germany instrument manufacturer, and are being exported to America, UK, Poland and Russia market etc.

We focus on supplying the right & suitable bearing products with competitive prices, and creating continued profit for you!

Competitive Advantage - Tapered Roller Bearing

• Our inch tapered roller bearings inner diameter d≥80mm are designed in strict accordance with the Timken design standard and single-row tapered roller bearings are completely interchangeable with Timken products

• OEM Services Provided, Experienced engineers in design, offering technical data sheets, bringing customized solutions

• Widely products range and huge stock holding as well as strong package to meet customer requirement

• Certification of ISO 19001-2008 and UKAS management system and TS16949.

• Main Export Markets: North America,  Europe, South America, Southeast Asia

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