Philadelphia Gear

Ball Mill Drives

These large coal crushing drive systems are usually rotated by motor-driven gearing. A typical application consists of a motor-driven primary single-stage reducer that, through a flexible coupling, drives a large open pinion which in turn, meshes with a large ball mill ring (girth) gear that is attached directly to the ball mill.

For over 50 years, we have supplied both the primary reducer and the open gear-set required to drive ball mill coal pulverizers.

Primary features of the Philadelphia Gear design:

  • Horizontally offset parallel shaft configuration
  • Single reduction, single helical gearing, supported by rolling element bearings
  • Splash lubricated gearing with heaters for low temperature operation
  • Integrated system turning gear (optional) which is chain driven and used during maintenance procedures performed on the ball mill