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The service-friendly combination
The model 121 has an external clutch and brake. This facilitates the service friendliness of this unit. It has a separate shaft system combined in a lightweight aluminum housing. The input shaft rotates constantly, the output shaft can be clocked arbitrarily. This model is available as desired with a steel or cast plate as a mounting base. Further advantages are the ease of installation and long service life.
These share the same basic structure as the 121-[ ]-20 type clutch/brake units. They are double-clutch units that have a through-shaft structure and place clutches (101-[ ]-15 types) at both ends of the drum.The hub may be used as the input for two-stage speed-change/forward-reverse operation, or the shaft may be used as the input for power distribution or the like. Select the input method that works best for you. Just as with the 121-[ ]-20, the construction holds up well under radial loads due to a wide bearing span, so it can be used under high tension when mounted with V pulleys, spur gears or the like.