Engineering of Variable Speed Pulley Drives

An introduction to Variable Speed Pulley Drives.

The Variable Speed Pulley Drives have been in production for over 50 Years. They hold a leading position in the field of steplessly variable speed drives.

Variable Speed Pulley Drives converts any standard constant speed motor to a Variable speed, that delivers infinite speed control for any desired speed within the speed range, instantly, accurately, smoothly and while the machine is in operation.

There are basically two types of systems

  • Adjustable Center Drive
  • Fixed Center Drive

Adjustable Center Drive.

This drive consists of :

  • The spring loaded variable speed pulley.
  • Variable speed belt.
  • Fixed diameter pulley (Fixed Pulley)
  • Motor sliding base.

The spring loaded pulley is mounted on the driving shaft (Motor) The motor is fixed on slide base.

Fixed diameter pulley (Fix Pulley) is mounted on machine / Gear reducer shaft and belt is inserted on both the pulleys.

The motor slide base is moved either towards or away from the fixed pulley while running. Through this change in center distance between driving and driven shaft, the belt is pulled in or out of the spring loaded pulley. This therefore changes the effective running diameter of the belt on the Variable Speed Pulley and in turn, speed variation of the driveN (Fixed pulley) is achieved. Apart from motor slide bases, motor pivoting arm or Jockey pulley can be used.

Fixed center drive

The fixed center drives consist of two Variable Speed Pulleys and a variable speed belt. One pulley is mechanically adjustable and the other is spring loaded. The mechanically adjustable pulley is mounted on the driving shaft (Motor) and spring loaded pulley on machine / gear reducer shaft.

Both the pulleys work together. The belt is pulled in or out between both pulleys, thus changing the effective running diameter of the pulleys and speed variation is achieved. The variation is obtained by means of the screw spindle provided on the mechanically adjusted pulley.


Manufacturer and Exporter of Mechanical Variable Speed Pulley Drives, Stepless Variable Speed Belt Drives, Variable Speed Belts, Variable Speed Drive for flameproof / explosive areas. We also design & manufacture custom built drives & pulleys as per customer's requirements, Adjustable Center Variable Speed Pulley Drives interchange to Lenze, Fixed Center Variable Speed Pulley Drives (FC Series) - Interchange to Lenze, Asymmetric Variable Speed Belt Drives Interchange to BECKER / BERGES, Adjustable Center Variable Speed Pulley Drives With Diaphragm Springs, Adjustable Motor Slide Base, Adjustable Center Variable Speed Drive For Standard 'V' Belts, Variable Speed Fixed Center Drive For Standard 'V' Section Belts, Variable Speed Pulley for Heidelberg Printing Machine, T.B. Woods Variable Speed Pulley, Berges Type RF b & Fsb, Variable Speed Pulley Drive for Tablet Compression Machine, Variable Speed Pulley drives for GTO / MO Printing machines, Variable Speed Pulley for MBO & Stahl Folding Machines, Mechanical Variator For AMADA Bandsaw Machine Interchange to MIKI, PIV Mechanical Variable speed gear box, PIV Mechanical Variable Speed Drive

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