Abstract: A yoke bushing that reduces the cyclic movement between the main shaft of a ball-and-race type coal pulverizer, thereby resulting in longer shaft life and reduced incidences of shaft failure. The yoke bushing is comprised of a flexible structure that provides individual contact areas which will have, at the same locations, equal stress fields between the main shaft and the yoke bushing.

Abstract: A pulverizer mounted on a foundation and comprising a housing enclosing a pulverizing zone and a base plate attached to the housing. The pulverizing zone includes a horizontally disposed rotatable grinding ring, rolling grinding balls positioned on the grinding ring, and means for rotating the grinding ring including an upright main shaft. An annular yoke is attached to the main shaft, and has an outer peripheral portion which is disposed superjacent to the base plate and supports the grinding ring. A load carrying member or thrust bearing is sandwiched between the base plate and the outer peripheral portion of the yoke to minimize the impact, shock, and eccentric loads that are transmitted from the coal grinding process to the main shaft. The load carrying member or thrust bearing achieves this by transmitting the vertical loads directly through the base plate to the housing and therethrough to the pulverizer foundation.

Abstract: An improved main shaft and assembly for a coal pulverizer having a circumferential groove at a predetermined location on the main shaft and in the yoke bushing to provide improved fretting resistance to reduce the occurrence of main shaft failure.

Abstract: An apparatus for modifying a gear casing used in coal pulverizer mills prevents lubricating oil leaks through worn O-rings by redirecting the oil in a different path which does not come into contact with the O-ring seals. An internal hose connection provides oil directly to a bearing top chamber through a passage in the bearing cartridge. A special connector is used to connect the internal hose to the passage. Several connector embodiments are disclosed.

Abstract: Reinforcement sections are provided at an outer surface and at an inner surface of a tire for a roll wheel assembly used in a pulverizer for crushing a material such as coal. These reinforcing sections cause the tire to be asymmetrical and are located on the tire only at areas where the wearing of the tire is highly predictable. The reinforcing sections provided on the inner surfaces of the tire are provided directly opposite of the reinforcing sections on the outer surface for preventing the localized thinning of the tire and extending the time interval between rotation and/or replacement of the tires.

Abstract: A pulverizer roll wheel assembly comprises a bracket with an opening therein for fixing the outer end of a roller shaft. Bearings mount a roller wheel with pulverizing tire to the inner end of the shaft for rotation of the pulverizer. A lip seal assembly separates an oil space around the inner end of the shaft with an air space around the outer end of the shaft. A pop off relief valve normally positioned near the lip seal is repositioned to the outer face of the shaft for easier access. A cover extends over the relocated valve for extending the air space around the relocated valve.