Patent ID: 7556240

Claim:
A rig drawworks comprising a first drum, wherein said first drum comprises: a rotatable first drum shaft having a rotational axis that extends in a longitudinal dimension; first and second drum heads spaced along said first drum shaft to accommodate a wrapping of a rig line about said first drum shaft between said first and second drum heads; a drive hub disposed about, rotatable relative to, and selectively rotatable with said first drum shaft; a first drive hub bearing between said drive hub and said first drum shaft; and a lubricant flowpath, wherein said lubricant flowpath comprises said first drive hub bearing and a first lubricant flowpath section that is annular about said first drum shaft, wherein said lubricant flowpath further comprises an inlet where a lubricant may be introduced into said lubricant flowpath and which will flow through said first lubricant flowpath section and then to said first drive hub bearing.