Page 240 - needle bearings

Cam followers stud type truck rollers
NTN

Bearing accuracy Fitting relations
The dimensional accuracy and profile accuracy of (1) Make the face height at the cam follower mount
cylindrical roller outer diameter (D) and outer ring width greater than "e" dimension given in applicable
(C), and the running accuracy of bearing assy are as Dimension Table. (Fig.1)
shown in Tables 4.3 and 4.4 of Section 4 "Bearing Furthermore, chamfer the stud mounting hole at R as
Tolerances" (page A-26) and the accuracy class of each small as possible (around 0.5ʷ45˚) and bring the side
conforms to JIS Class-0. The dimensional accuracy of faces of side face in precise contact.
spherical outer diameter (D) and stud diameter (d1) are as
shown in applicable Dimensions Table.
Face height
Bearing fit and radial internal clearance
Table 1 shows the recommended fitting tolerance for
the stud mounting hole. e
And Table 2 shows the radial internal clearance.

Table 1 Recommended tolerance
Tolerance range class
Classification for mounting hole
Fig. 1
Metric series H7
Inch series F7
(2) Don't hammer directly the cam follower rib. Doing
Table 2 Radial internal clearance so would cause breakdown and rotation failure of
Unit : Жm
the rib.
Nominal roller Clearance
inscribed circle
diameter
Fwʢmmʣ C2 CN (ordinary) C3 C4
over incl. min max min max min max min max
3 6 0 10 3 17 15 30 20 40
6 10 0 12 5 20 15 30 25 45
10 18 0 15 5 25 15 35 30 55
18 30 0 20 10 30 20 40 40 65
30 50 0 25 10 40 25 55 50 80
50 80 0 30 15 50 30 65 60 100
80 100 0 35 20 55 35 75 70 115
Note) When shock load acts on, make the stud - hole
clearance as less as possible in assembling. Fig. 2

(3) The oil hole position on the stud raceway surface is
shown with NTN mark stamped on the stud rib
surface. Mount the stud so the oil hole locates within
the non-load area (non-load side). (Fig. 3) If the oil
hole locates within the load area, it would cause
shorter life of the follower.

Loading Loading

Fig. 3

B-178