Adjustable and variable speed pulleys

Adjustable pulleys

• Static adjustable pulleys “PR DV” and “PBR DV” are designed to allow adjustment of pitch diameters.  One flange is screwed on the threaded hub. The movable flange is provided with set screws for fixing into the required position.
• They are suitable for Z-SPZ-3V; a-SPA; b-SPB-5V; C-SPC section V-belts.

Variable speed drives

• The hub is made from induction hardened steel, hard chrome plated and ground to give uninterrupted slide fit with flanges. Keys are not used with this application. Moving flanges give a wide contact area therefore eliminating uneven belt pressure.
• The pulley flanges are coupled by means of nylon (6,6) sleeve couplings to the outside of the flanges and by two flats machined on each end of the pulley hub. Two springs situated inside the nylon coupling give the desired pressure.