ROLLER FOLLOWERS

bearings egypt, egypt bearings, ROLLER FOLLOWERS
Types
IKO ROLLER FOLLOWERS are available in the various types shown in the following tables.

Table 1.1 Bearing type

Series / Type Separable type
With Cage
Without inner ring with inner ring shielded seald
Crowned outer ring RNAST...RNAST...RNAST...ZZRNAST...ZZUUR
Cylindrical outer ring RNASTNASTNAST...ZZNAST...ZZUU
Table 1.2 Bearing type
Series / Type Non-neparable type
With Cage full
shielded seald shielded seald
Crowned outer ring NART...RNART...UURNART...UURNART...VUUR
Separable roller followers
These bearings consist of an IKO NEEDLE ROLLER CAGE combined with the inner and outer rings, and as they are separable, handling is simple. Also, as oil lubrication is easy, they are suited to high rotational speeds.
When using RNAST, it is necessary to use hardened and ground shaft shown in Article as outer ring and cage are guided axially by the side surface of adjacent machine parts,this surface should,ideally, be hardened and ground, or at must have a high grade turning finfsh.

Separable shielded roller followers
These bearings have side washers on both sides of the inner ring, the clearance between the washers and the outer ringis small, and they have labyrinth sealing performance. There is an oil hole in the inner ring for re-lubrication.

Separable sealed roller followers
These bearings have special synthetic rubber seals on the outer ring contacting with the side washers of the IKO SEPARABLE SHIELDED ROLLER FOLLOWERS,so the penetration of foeeign particles can be prevented.

Non-separable shielded roller followers
These bearings are non-separable and come in caged and full complement types. The outside surface of the outer ring is crowned and there are washers securely fastened on both sides of the inner ring . Caged bearings are suited to high rotational speeds and full complement bearings are suited to oscillating movements or low rotational speeds under heavy loads. The inner ring has on oil hole. In the case of full complement type, gease pocket are small so re-lubrication should be carried out more frequently.

Non-eparable sealed roller followers
These bearings have special synthetic rubber seals on the outer ring contacting with the side washers of the IKO NON-SEPARABLE SHIELDED ROLLER FOLLOWERS,so the penetration of foeeign particles can be prevented.

Grease
Good quality lithium sope base grease is packed in IKO SEALED ROLLER FOLLOWERS and can be used within a temperature range of -20 to +120°C.
Accuracy standard
The accuracey of all IKO ROLLER FOLLOWERS, with the execeptionof the dimensiomal tolerances shown below, are manufactured to JIS standard. The radail clearance is C2 clearance in the case of caged bearings and normal clearance in the case of full complement bearings.

Fit
IKO ROLLER FOLLOWERS are normally used in places of rotating outer ring load, and the recommended fit is shown in Table 2.

Table 2 Recommended shaft tolerance
Without
innerring
With
inner ring
k5, k6g6, h6
Track capacity
The track capacity shown in Table 3 is the value when the outer ring of the roller followers comes in contact with the steel companion parts having the hardness HRC40, (tensile strength 127 kgf / mm²). These values express the allowable load which can be continuously carried without deformation and brinelling on the track of the track of the companion parts. If the hardness of thr track of the companion parts is other thanHRC40, values can be attained by multiplying the track capacity factor shown Even when the track capacityis large than the basic static load rating Co, a load large than co should not be but on the bearing.

Mounting
When used with heavy loads, it is preferred that the inner ring oil hole does not enter the loaded zone. In the case of NAST...ZZ, NART and NART...V series, the shoulder diameter (clamping diameter)of the mounting part is the 'a' shown in the dimension table. When assembling the inner ring and side washers must be securely tightened in the axial direction, as shown.

Table 3 Track capacity
Bearing
with
cylindrical
outer ring

Track
capac-
ity
Bearing
with
cylindrical
outer ring
(1)
Track
capac-
ity
RNAST 5 240 - -
(R)RNAST 6 360 NAST 6ZZ 360
RNAST 8 410 NAST 8ZZ 460
(R)RNAST 10 570 NAST 10ZZ 700
RNAST 12 610 NAST 12ZZ 750
(R)RNAST 15 670 NAST 15ZZ 820
RNAST 17 1110 NAST 17ZZ 1200
(R)RNAST 20 1300 NAST 20ZZ 1410
RNAST 25 1440 NAST 25ZZ 1560
(R)RNAST 30 2260 NAST 30ZZ 2260
RNAST 35 2620 NAST 35ZZ 2620
(R)RNAST 40 2740 NAST 40ZZ 3090
RNAST 45 2910 NAST 35ZZ 3280
(R)RNAST 50 3080 NAST 50ZZ 3470

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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