Tsubaki: The solution for shaft locking devices
Technical Notes INSTALLATION AND REMOVAL
EL Installation and Removal
(7) Using a torque wrench or a hexagonal spanner wrench tighten the bolts to approximately quarter of the specified torque. (8) Using the wrench tighten the bolts to one-half the specified torque. (9) Bring up to full tightening torque M A until the bolts do not turn any further. Use the torque wrench to complete this final step and make sure that the space between the pressure flange and the hub or shaft end is uniform throughout the circumference. ■ Notes on AS and EL Series When using a POWER-LOCK that is not self-centering, mount a guiding unit to the hub. Do not center by tightening the bolts. Instead, center or align the hub and shaft by adjusting the guide portion itself. The alignment accuracy is determined by the length and tolerance of the guide portion.
A. Removal
(1) Verify that the shaft and the inner surface of the hub are clean, we recommend to lightly oil surfaces. Note: Do not use silicone or molybdenum lubricants. Otherwise, friction coefficient will reduce, and standard torque will not be achieved. (2) If an indentation in the inner hub corner or a large R is machined, a spacer sleeve must be used. (3) An EL POWER-LOCK can be installed in two ways, resulting in different transmissible torque: (a) Install by pressurizing the outer ring or (b) by pressurizing the inner ring. Pay close attention to the installation position during this procedure. (4) Mount the POWER-LOCK so that it slightly moves in parallel to the shaft.
B. Removal (1) Tighten the bolts in a crisscross sequence. Normally, when the bolts are loosened, the POWER-LOCK will remove itself.
(2) If it does not remove after loosening all the bolts, clean the surrounding surface and lightly hit the POWER-LOCK with a hammer. (3) If an EL POWER-LOCK does not remove by procedure (2), an increase in friction coefficient may have taken place due to damaged contact surfaces or a dislocation of the unit may have happened due to incorrect mounting or a plastic deformation may have occurred. In these cases, the unit must be disassembled and the problem investigated before reassembling. C. Reusability (1) An EL POWER-LOCK cannot be reused if the bolts or other parts are damaged. (2) Assembly and disassembly of the POWER-LOCKs may be repeated a few times. However, if the hub and shaft material yield stresses σ 0.2 cannot tolerate the contact pressure P and P', repeated assembly and disassembly may damage certain parts of the hub-shaft contact surfaces.
(5) Mount by tightening the bolts on the pressure flange evenly, in a crisscross sequence. Make sure that the amount of space between the pressure flange and the hub is uniform throughout the circumference. Note: If the pressure flange material strength is insufficient, adequate pressure cannot be achieved. Confirm the catalog rate for pressure flange material strength before installing and avoid damages to the POWER-LOCK and the bolt head bearing surfaces. (6) Hand-tighten the bolts until the pressure flange no longer moves in the shaft direction. Then, adjust the hub position and phase. Note: Do not use a spring washer or toothed washer with the pressure flange and bolts.
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