NTN - Bearing units catalog a-21000-i

APPENDICES
INSTALLATION
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MOUNTING THE ECCENTRIC LOCKING
COLLAR SYSTEM UNIT
In this system, unlike the screw system, the shaft and
inner ring are fastened together by fastening the eccentric
collar in the direction of the rotation of the shaft. They
are fastened together securely, and deformation of the
inner ring seldom occurs. This system, however, is not
recommended for applications where the direction of
rotation is sometimes reversed.
Directions for mounting the unit are as follows :
1) Make certain that the frame in which the housing is to
be mounted is suitable to the operating conditions with
regard to rigidity, flatness, etc.
2) Make sure that the end of the shaft is not burred and
that the end of the set screw in the eccentric collar is
not protruding from the interior surface of the collar
(Fig. 19).
3) Mount the housing of the unit securely onto the frame.
4) Determine the relative position of the unit and the shaft
accurately so that the unit will not be subjected to any
thrust, and then insert the eccentric collar (Fig. 20).
5) Fit the eccentric circular ridge provided on the inner
ring into the eccentric circular groove of the eccentric
collar, and then tighten the collar by hand-turning in the
direction of the shaft (Fig. 21).
6) Insert a bar into the hole provided on the periphery
of the eccentric collar and tap the bar so that the
collar turns in the direction of rotation of the shaft
(Fig. 22).
7) Fasten the set screw of the eccentric collar onto the
shaft. Recommended tightening torques are given in
Tables 13 and 14.
Fig. 19 Fig. 21
Fig. 20
Fig. 22
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