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Variable Speed Drive, Trisons
Variable Speed Drive, Trisons
N S Engineering, manufacturer and exporter of power transmission products, offers Trisons Variable Speed Drive. This is a planetary drive, where power and speed is transmitted by spring applied frictions forces. The input shaft drives the inner sun. The two halves of the inner suns are compressed together with cup springs creating force against the planets. The planets also contract the outer rings, which are fixed into slots in the planet carrier. When the input shaft turns the inner sun, the planets rotate against the outer rings, thereby causing the planet carrier and output shaft to rotate. How the speed changes: turning the hand wheel causes the movable outer ring (MOR) to turn. The MOR and the fixed cam ring are separated by the ball cage. The double cam action between the MOR and the fixed cam ring caused the MOR to shift axially as it rotates. The tapered planets are forced into the inner sun as the MOR shifts toward the stationary outer ring (SOR), or allows the spring action of the inner suns to force the planets away from the centre line as the MOR shifts away from the SOR. Slots in the planet carrier allow the planets to move radically close to or further from the centre line. This movement, relative to the centre line, alters the effective pitch diameter of the planets and the output speed. The drive may be shifted to low speed without shaft rotation but the drive must be rotating in order to shaft to a higher speed.