Automatic Belt Tensioning


Automatic Belt Tensioning		sales@hi-lo.com --- 800-373-2279

THE SECRET TO A BETTER V-BELT DRIVE . . .

. . . AUTOMATIC BELT TENSIONING

cam mechanism

Exclusive Cam Mechanism Automatically
Adjusts Belt Tension
Ask any V-Belt drive engineer about the importance of belt tension in variable speed pulley drives. Too little tension and the belt slips. Too much tension and you waste energy and accellerate component wear. When a Hi-Lo Pulley is mounted on a motor shaft, the pulley shaft with the cam housing attached becomes integral with the motor shaft. The sliding pulley faces, however, are free to move axially and rotate until the cam followers, due to the effective belt tension, contact the cams. When the belt tension requirement increases, the cam followers rotate up the helical cam ramp causing additional axial pressure between the faces and the belt. The belt is consequently gripped tighter and the increased load can be transmitted without slippage or loss of pitch diameter setting. When the belt tension requirement decreases there is an opposite reaction and energy-wasting belt tension is reduced.

Only Hi-Lo Variable Speed Pulleys
have automatic belt tensioning!
AND MORE!

additional bearing support

The peripheral support of the cam followers reduce pressure and wear on the sliding face bearing surface.
The necessity of torque carrying keys in the pulley shaft and slide face are eliminated, resulting in full bearing surface contact.

maintenance
free
bushings Not merely oil impregnated, our precision-fit bronze bushings have an exclusively formulated impregnation which virtually eliminates most fretting and corrosion wear problems.

	THE SECRET TO A BETTER V-BELT DRIVE . . . . . . AUTOMATIC BELT TENSIONING
cam mechanism	Exclusive Cam Mechanism Automatically Adjusts Belt Tension Ask any V-Belt drive engineer about the importance of belt tension in variable speed pulley drives. Too little tension and the belt slips. Too much tension and you waste energy and accellerate component wear. When a Hi-Lo Pulley is mounted on a motor shaft, the pulley shaft with the cam housing attached becomes integral with the motor shaft. The sliding pulley faces, however, are free to move axially and rotate until the cam followers, due to the effective belt tension, contact the cams. When the belt tension requirement increases, the cam followers rotate up the helical cam ramp causing additional axial pressure between the faces and the belt. The belt is consequently gripped tighter and the increased load can be transmitted without slippage or loss of pitch diameter setting. When the belt tension requirement decreases there is an opposite reaction and energy-wasting belt tension is reduced. Only Hi-Lo Variable Speed Pulleys have automatic belt tensioning! AND MORE!
additional bearing support	The peripheral support of the cam followers reduce pressure and wear on the sliding face bearing surface. The necessity of torque carrying keys in the pulley shaft and slide face are eliminated, resulting in full bearing surface contact.
maintenance free bushings	Not merely oil impregnated, our precision-fit bronze bushings have an exclusively formulated impregnation which virtually eliminates most fretting and corrosion wear problems.