NEEDLE ROLLER BEARINGS
bearings egypt, egypt bearings, NEEDLE ROLLER BEARINGS
Types
IKO NEEDLE ROLLER BEARINGS are available in the variouus types showen in the following tables.

Table 1.1 Bearing type
Series Type Caged needle roller
bearings 		Guide roller bearins
Without
inner ring 		with
inner ring 		Without
inner ring 		With
inner ring
Metric Dimension series 49
Dimension series 69
Dimension series 48
Heavy duty
Light duty 		RNA 49
RNA 69
RNA 48
TR
TAF 		NA 49
NA 69
NA 48
TRI
TAFI 		GTR GTRI
Inch BR BRI GBR GBRI

Table 1.2 Bearing type
Series Type Caged needle roller
bearings 		Guide roller bearins
Without
inner ring 		With
inner ring 		Without
inner ring 		With
inner ring
Metric Dimension
series 49		 Two seal
One seal 		RNA 49...UU
RNA 49...U 		NA 49...UU
NA 49...U 		- -
Dimension
series 69 		Two seal
One seal 		RNA 69...UU
RNA 69...U 		NA 69...UU
NA 69...U 		- -
Inch Two seal
One seal 		- - GBR...UU
GBR...U 		GBRI...UU
GBRI...U

Caged needle roller bearings

bearings egypt, egypt bearings, NEEDLE ROLLER BEARINGS
This bearing consist of a ribbed outer ring, a cage constructed ti IKO's unque light-weight and rigid standards, and needle rollers. When rotating,the cage guides the needle rollers accurately and gives the best load distribution.
In the metric series, there are ISO-specified NA 49 and NA 69 series, the NA 48 and TAFI series which corresponds to the international dimension series, as well as the heavy duty TRI series wich is used throughout Japan. The TAFI series is a light duty bearings. with a sectional hieght of the similar thinness as shell type needle roller bearings. The inch series BRI is a bearing which is equivalent to the American ANSI- standard specification, and there are oil grooves on the inner and outer rings.

(1)Caged needle roller bearings(without inner ring)
The dimensional tolerance of the bearing's inscribed circle diameter dr is, with the exception of BR series, manufactured to F6 tolerance. by combining a hardened and ground fhaft with the bearing, any desired radial clearance can be chosen. Also, the change of dimensional accuracy produced by combining it with the inner ring does not occur. Therefore, rotational accuacy is high and, at the same time, the shaft diameter is increased by the same amount as the thickness of the inner ring, which increases its rigidity.

(2)Caged needle roller bearings(with inner ring)
This bearing with inner ring is used when the shaft can not be hardened and ground. As the inner with inner ring and outer ring with cage and roller assembly can bothbe separated and furthermore, there are small chamfers at both ends of the raceway surface of the inner ring, mounting and assembling are easy. The width of the inner ring of TRI and BRI is a little wider than that of the outer rings.
Sometimes, due to thermal expansion during operation or misalignment on mounting, the inner or outer ring moves in the axail direction and the entire lenght of the roller does not make contact. Take note of the value of the maximum per missible axial displacement "S" in the dimension table.

Guide roller bearings
This is a full complement roller bearing. The roller are accurately guided by the guide rail at the center of the outer ring raceway surface and the guiding grooves of the grooved rollers. So roller skewing, which is considered a weak point of full complement bearings, is minimized and rotating accuracy is very high
Consequently, it is possible to achieve the proper rotation and load distribution, and they are ideal for heavy loads, shock loads, and oscillating movement
The width of this bearing's inner ring is a little wider than its outer ring.

Sealed needle roller bearings
This sealed bearings are available in caged bearing (NA 49, NA 69, series)and full complement roller bearing (GBRI series), and are provided with seals on one or two sides. The special synthetic rubber seal has excellent fealing against dust and grease leakage
The two-sealed type is packed with lubricating grease,while the one-sleade type is not, but will be supplied packed with grease upon request. Agood lithium soap base grease is usually used for lubrication and can be used in the -20 to + 120°C temperature range. When using two or more IKO ROLLER BEARINGS together on the same shaft, it is necessary to distribute the load evenly. Matched bearings can be supplied if specified.
Accuracy standard
IKO NEEDLE ROLLER BEARINGS, with the exeception of BR and BRI series inch dimensiins, are manufactured to JIS standards. The dimensional tolerance of the inscribed circle diameter dr of bearings without an inner rins is F6 tolerance. The accuracy of BR and BRI series is equivalent to ANSI standards. This accuracy is shown in Table 2. The dimensional tolerance of the inscribed circle diameter dr is shown in Table 3.

Table 2 Accuracy of the inner and outer ring of BR and BRI series
Nominal bore dia.d
or outside dia. D
mm 		bore dia. Outside dia. With tole-
ranceof inner
(or outer)ring 		Tolerance limit
of radial run-
out(max.)
Tolerance
of dm(1) 		Tolerance
of Dm(1)
over inch high low high low high low Inner
ring 		Outer
ring
- 19.050 0 -10 - - 0 -130 10 -
19.050 30.162 0 -13 0 -13 0 -130 13 15
30.126 50.800 0 -13 0 -13 0 -130 15 20
50.800 82.550 0 -15 0 -15 0 -130 20 25
32.550 120.650 0 -20 0 -20 0 -130 25 35
120.650 184.150 - - 0 -25 0 -130 30 45

Table 3 Dimensional tolerance of the inscribed circle diameter of BR series
Nominal inscribed
dr mm		Tolerance of inscrbed circle
diameter mm
Over Inch High Low
- 18.034 +43 +20
18.034 30.226 +46 +25
41.910 50.038 +51 +25
50.038 70.104 +53 +28
70.104 80.010 +58 +28
80.010 102.108 +61 +31

clearance

IKO NEEDLE ROLLER BEARINGS, with the exeception of BRI series, are manufactured with the normal clearance . BRI series are manufactured as shownin Table 4.

Table 4 Radial clearances of interchangeable inch
dimension needle roller bearing - BRI series
Nominal iniscribed circle dia.
dr mm		 Clerance
Over Inch Mim. Max.
- 18.034 33 66
18.034 25.908 41 76
25.908 30.226 46 82
30.226 35.052 48 86
35.052 41.910 50 89
41.910 50.038 50 92
50.038 70.104 56 99
70.104 80.010 56 104
80.010 100.076 63 117
100.076 102.108 68 127

Agent : RIV Company
6 Orabi Street,
P.O.Box 101, Cairo 11511, Egypt
Tel. : +202-5749921, +202-5759921
Fax. : +202-5776236, Tlx. : 92808 RIV UN
E-mail : iko@riv.org

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