Rating of basic P.I.V. Gears


Here is the P.I.V chain drive- positive power transmission yet infinitely variable – really stepless speed control.

The sprockets of the P.I.V chain drive are two pairs of the cone- shaped radically – grooved wheels mounted on splined shafts.

The chain is made from unique links which contain packes of self – tooth – forming hardened steel slats. Each slat is free to move sidewise and conform to the tooth shape of the paired sprockets. When the paired wheels are far apart the chain actually operates around a small diameter. When the wheels are close together the chain operates around a large diameter.

This principle – varying the driving and driven diameters – is the principle on which all variable speed control with positive power transmission.


PIV Cylinder Roller Chain

PIV Conical Disc

PIV Chains



Maximum speed setting – adjusts input shaft wheels close together to form a large driving diameter. This automatically separates output shaft wheels to form a small driven diameter. Minimum speed setting – Adjust input shaft wheels wide apart to form a small driving diameter.This automatically closes output shaft wheels to form a large driven diameter.

  Copyright Gayatri Gear Industries. Ahmedabad.