Patent ID: 7566016
Filing Date: 2009-07-28
Classification: B02C,F16C

Abstract:
1. A main shaft for a pulverizer, comprising: a first threaded portion located at an axial end of the main shaft and having threads extending along at least a portion of the first threaded portion; a first tapered portion adjacent to the first threaded portion, the first tapered portion having a narrowest circumference closest to the first length and configured to accept a yoke; an intermediate portion adjacent to the first tapered portion, the intermediate portion having a circumference greater than a greatest circumference of the first tapered portion; a second threaded portion located adjacent to the intermediate portion, the second threaded portion having a circumference greater than the circumference of the intermediate portion and having threads extending along at least a portion of the second threaded portion; a second tapered portion adjacent to the second threaded portion, the second tapered portion having a narrowest circumference closest to the second threaded portion and configured to accept a bevel gear assembly; an end portion adjacent to the second tapered length, the end portion having a circumference less than a greatest circumference of the second tapered portion; an upper jackbolt nut adapted to thread onto the first threaded portion to secure the yoke to the main shaft; and a lower jackbolt nut adapted to thread onto the second threaded portion to secure the bevel gear assembly to the main shaft; wherein the main shaft excludes any keyway.