Companion Sheaves
Browning® 1022193 MVP® Type 15 Web Companion Sheave, 1-3/8 to 3-5/8 in Bushed Bore, 10.4 in OD, 5 Grooves, 10.4 in Dia Pitch, 7-7/8 in W Face
MVP® sheaves are a series of angular faced center flanges which are bolted to the fixed flange mounted on the barrel. They also contain another series of angular faced flanges which are bolted to the end flange and threaded locking collar. When the threaded locking collar is turned clockwise, it moves the angular flanges closer together increasing the pitch diameter. When the collar is moved counterclockwise, the flanges are moved apart, decreasing the pitch diameter. The pitch diameter is infinite. This means the collar adjustment can be turned and stopped at any time regardless of location between the minimum and the maximum setting. When the desired diameter is obtained, the locking collar is locked by tightening screws. In contrast VL, VP, and VM sheaves are limited by half- turn or 180 deg adjustment points.
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Browning® 3779949 VP Series Type 2 Variable Pitch Sheave, 1-3/8 in Finished Bore, 6.55 in OD, 1 Groove, 4.9 to 5.9 in (A/4L)/5.2 to 6.4 in (B/5L/5V) Dia Pitch, 7/8 to 1-1/4 in W Face
The principle of a variable pitch sheave is that the threaded angular faced discs forming the V-shaped groove in which the belt rides are movable. VP sheaves consist of a male with a threaded barrel, and a female with a threaded bore. The male section with threaded barrel has flat surfaces at 180 deg increments that allow a flat surface for the setscrew to mate with. When the discs are moved toward each other, the belt rides higher in the groove and the pitch diameter of the sheave is larger which increases the driven speed. When the discs are moved away from each other, the belt rides lower and the pitch diameter is smaller decreasing the driven speed. The common term for this speed adjustment is called number of turns open from closed position.
