Gearless Mechanical Transmissions (GMT)

Carlyle Johnson's patented Gearless Mechanical Transmission is a gear reduced without gears. The GMT reduces speed though a series of cam surfaces and balls, which form a nutating motion. The use of balls and cams eliminates all friction associated with gears sliding in and out of contact.

The end results is an extremely efficient speed reducer or speed increaser.

With extremely smooth operations, Gearless Mechanical Transmissions offer an array of features that make them well-suited for many applications including robotics, aerospace, power generation, military and transportation.

Carlyle Johnson Machine Company engineers can customize a gearless mechanical transmission to meet your exact operational requirements. From altering a standard design to producing a completely customize unit, we are ready for your toughest power transmission challenge.

Features of GMT Gearless Mechanical Transmission

CJM's GMT units are designed for industrial applications that require low backlash and high repeatability, replacing components that currently utilize gear reduction, or cam and cycloid/roller systems. Unlike many existing transmissions – even parts which have been designed as replacements - Carlyle Johnson's gearless transmissions feature a low starting torque and are extremely efficient.

By removing frictional sliding methods virtually all torque is utilized for powering, and there is virtually zero backlash, vibration or ball skidding.

The Gearless Mechanical Transmission also offers high torsional rigidity. Torque transmitting members are loaded in a compressive mode of operation – where the gear design places teeth in a cantilevered loaded mode. This allows for a significantly greater angular deflection, as a result of torsion loading on the system during operation.