Page 302 - needle bearings

Linear Ball Bearings, Solid and Drawn Cup Types
NTN

Linear Ball Bearings, Solid and Drawn Cup Types

Four to nine rows of balls are configured equally in the
outer ring (outer cylinder). The ball rows circulate in axial Shaft and housing requirements
direction while being guided by the cage. Thus, these Any shaft /housing on/in which these bearing types are
bearing types move infinitely on a shaft in axial direction. fitted must meet the requirements specified in Table 2.
However, these bearing types can't rotate.
Table 2 Shaft and housing requirements

Outer ring Characteristics Shaft Housing
Ball row
Roundness (max) IT3 IT4
Cylindricality (max) IT2 IT4
Surface roughness (max.) 0.4a 1.6a
Surface hardness HRC58ʙ64 ʵ
Hardened layer depth (min) 0.4mm ʵ

Cage

How to mount
Fig. 1
The housing for Type KLM (solid type) canŻt be fixed
perfectly with interference only and, therefore, must be
fixed in axial direction using a snap ring.
On the other hand, Type KH (drawn cup type) needs
Dimensional accuracy
no axial fixing by a snap ring because it is press-fitted in a
The respective accuracy of the boundary dimensions , housing with interference. For press-fitting, press the
inscribed circle diameter (Fw) , outer diameter (D), and outer ring at its stamped mark side(hardened side) using
width (C) of Type KLM (solid type bearing) are as a mandrel illustrated in Fig.2.
described in applicable Dimensions Table. Same bearing
with higher dimensional accuracy is offerable on special
request. Feel free to contact NTN when such a bearing is
needed.
For Type KH (drawn cup type), its outer ring is so thin-
walled that it deforms inevitably to some extent in the 15˚
manufacturing processes, particularly heat-treating
process, but it is so designed as to be restored normally
from such deformation and fulfill its specific function with
the required accuracy by being press-fitted in a housing B
with the required dimensional accuracy.
Feel free to contact NTN for the method of measuring
the dimensional accurracy.
A
Bearing fit
AʹFwʵ(0.03ʙ0.04) mm
The use of a shaft or a housing with the dimensional BʹDʵ(0.2ʙ0.3) mm
tolerance shown in Table 1 would ensure proper radial
clearance. Where further small radial clearance is Fig. 2 Series KH
wanted or preload is applied, the radial clearance is
adjusted using a split housing or otherwise bearing fit
required for smaller clearance or preload is selected.

Accessories
Table 1 Bearing fit
Shafts, shaft support stands and housings exclusive for
Type Shaft Housing NTN linear ball bearings are also offerable. Feel free to
series KLM contact NTN for the detailed information.
Solid type g6 (g5) H7 (H6)
series HK H7 (H6) - steel series -
Drawn-cup type h6 (j5) K7 (K6) - light metal alloy series -
Note) The parenthesized data is applied to shaft/housing subjected to higher
accuracy or of vertical construction.

B-240