BALL BEARING HOUSED UNITS A-68 TIMKEN
BALL BEARING HOUSED UNIT CATALOG Download 3D Models and 2D Drawings at cad.timken.com
TIMKEN SELF-LOCKING COLLAR INSTALLATION
Most Timken housed units come equipped with the self-locking collar to facilitate the mounting of wide-inner-ring ball bearings. This self-locking collar eliminates the need for locknuts, washers, shoulders, sleeves and adapters. The locking collar has a counterbored recess made purposely eccentric to the bore. The collar recess and the end of the bearing inner ring with which it engages are both machined so that they act as mating cams when on the shaft. When the collar is engaged to the inner ring, it grips the shaft tightly with a positive binding action that increases with use. No adjustments of any kind are necessary.
For simplified installation of Timken housed units equipped with concentric-collar bearings, the collar is normally assembled to the wide inner ring for shipment. Slip the complete unit on the shaft following steps 1 and 2 (table A-22) described for the self-locking collar procedure, and tighten both set screws.
TIMKEN SET SCREW LOCKING BEARING
Steps 1 and 2 (table A-22) can be repeated from the self-locking collar installation above. To lock the set screw bearing, simply tighten each inner ring set screw to the suggested torque listed by shaft size. See table A-21.
TABlE A-21. sET sCREW lOCKiNg gUiDE.
in. mm Torque in. - lbs.
/16 17 35
/4 - 1 20 - 25 80 1
/16 - 1
/4 30 - 45 155 1
/16 - 2
/16 50 - 55 275
It may be necessary to rotate the shaft to provide an easy access of the set screw wrench to the set screws. To disassemble, loosen the set screws.
1. Slip the shaft through the pillow block or other Timken housed unit incorporating the wide-inner- ring ball bearing. Be certain the bearing is aligned in position along the shaft to eliminate any possibility of cramping loads. 2. Fasten the unit securely to the base using the proper bolt size. 3. Place the self-locking collar on the shaft with its cam adjacent to the cam on the end of the bear- ing's inner ring. The eccentric recessed cam will slide over and engage the corresponding cam on the bearing inner ring. Turn the collar in the direction of shaft rotation. 4. Using a lightweight hammer and a drift pin inserted in the drift-pin hole, tap lightly in the direction of shaft rotation to positively engage the collar. The wide inner ring is now locked to the shaft. 5. As a final step, fully tighten the set screw. It exerts a wedging action to hold the collar always in the engaged position, even under shock load. This design will operate effectively after the cams are tightly locked and in most cases, with no set screws at all.
TABlE A-22. sElf-lOCKiNg COllAR iNsTAllATiONPrevious Page