Page 241 - needle bearings

Cam followers stud type truck rollers
NTN

(4) Particularly where loose of the mounting screw is
forecast due to wide amplitude vibration during Lubrication and how to feed and replenish
running, the mounting methods as illustrated in Fig. 4 grease into the follower
are available. Lubrication
The cam follower type with synthetic rubber seal (with
tail code LL) and the full-complement roller type are pre-
filled up with lithium soap base grease so they can be
used in the operating temperature range of -25 to
+100˚C.
The type with cage and with no seal is not filled up with
grease. If a grease pre-filled type is needed, feel free to
contact NTN.
Further, NTN Bearings with Solid Drease using solid
lubricant of less leakage is also available on request. Feel
[a] Use JIS B 1181 Class-3 [b] Use a specific washer
thin type nut as double with standard nut. free to contact NTN for the detailed information.
nut for tightening.
Fig. 4 The outer ring outer surface of bearing and the
track surface must both be lubricated. Failure to
lubricate could result earlier in damage of bearing.
(5) The stud is subjected to bending stress and tensile
force arising from bearing load. Tighten the stud screws
with tightening torque which does not exceed the
torque value specified in applicable Dimension Table. How to feed and replenish grease
Too tight tightening torque could result in rupture Feed and replenish grease through a grease nipple
of the threaded portion. provided on the flange end face or threaded-side end
(6) A hole is provided on the stud center at right angle to face of the stud. In this case, plug the grease-feed hole
the shaft axial center, as illustrated in Fig. 5. Use this or the tapped hole at non-greasing side (with a special-
hole for locking or grease replenishment. purposed plug or a threaded plug with hexagon socket.)
These grease nipple and plug are enclosed in each
cam follower package. Screw-in them in specific position
before mounting the cam follower.
Special grease nipple and that specified in JIS
Standard as applicable are available for use. The
dimensions thereof and the applicable bearing types are
as specified in Tables 3 and 4 respectively.
Furthermore, special press-fit type plug and threaded
plug with hexagon socket are available for use. The
dimensions thereof and the applicable bearing types are
Fig. 5
as specified in Tables 5-1, -2 and Table 6 respectively.
When using the special-purposed press-fit plug, press-
(7) For mounting and adjusting the eccentric stud type fit it in the grease feed hole using a mandrel of applicable
cam follower, follow the sequence given hereunder. dimension shown in Table 7.
1. Insert the stud in the mounting hole so that the NTN
Table 3 Grease nipple dimension
mark (showing oil hole position) locates in relative to
load acting direction as illustrated in Fig. 3. Nominal Dimension
2. Turn the stud using the recessed slot for screwdriver L nipple mm
on the stud head or the accessory threaded plug with L1 number d D L L1
hexagon socket, to adjust a clearance from the mating NIP-B3 3 7.5 9 5.5
contact surface. d D NIP-B4 4 7.5 10 5.5
3. After adjustment, tighten the stud nut with specific NIP-B6 6 8 13 6
tightening torque described in applicable Dimensions NIP-B8 8 10 16 7
Table.
NTN cam follower is generally stud-mounted so Nominal Dimension
that non-uniform load (bias load) could act on the (Hexagon nipple mm
width across number
bearing, inversely affected by fitting loose arising flats) d H R L B
from continuous running. H NIP-X30 M4ʷ0.7 13.9 4 5 7
B r L
So, good care must be exercised of fitting loose d JIS A-M6F M6ʷ0.75 13.5 4 5.4 7
for stable running of an equipment. JIS A-PT1/8 PT1/8 20 8 9.5 10

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