Patent ID: 6935443
Filing Date: 2005-08-30
Classification: E21C,F16C

Abstract:
1. A disk bit arrangement comprising: a bit holder; a bearing journal, said bearing journal having a truncated cone shape on a fastening side and said bit holder having a conical hole complementary to said truncated cone shape, said bearing journal being fastened overhangingly and detachably in said bit holder by means of a fastening bolt, said bearing journal being connected by said fastening bolt to said bit holder; a combined radial and thrust bearing, wherein the bearings are in direct contact with one another; a disk body with an outer cutting edge of wedge-shaped cross section and an axial hole, said disk body axial hole being arranged freely rotatably and in an axially fixed manner on said bearing journal by means of said combined radial and thrust bearing, a circumference of said bearing journal forming a bearing inner part of said combined radial and thrust bearing, and said axial hole of said disk body forming a bearing outer part of said combined radial and thrust bearing, said disk body having a one-part design and being provided with said axial hole as a blind hole, the radial bearing component of said combined radial and thrust bearing being provided as one of a needle roller bearing, a cylindrical roller bearing and a slide bearing, and the thrust bearing component of said combined radial and thrust bearing mitigating axial forces and comprising at least one ball bearing ball, an inner cylindrical track or sliding track being defined on said bearing journal and an outer track or sliding track being defined in said blind hole of said disk body for said combined radial and thrust bearing with a ball groove forming a ball track for said at least one ball bearing ball, wherein a diameter of said at least one ball bearing ball is larger than a diameter of said needle rollers or said cylindrical rollers or larger than a thickness of a sliding bush of said slide bearing, and annular front sides of said disk body and of said bit holder pointing toward each other form a seal, and a closable filling hole is provided in one wedge flank of said disk body for said at least one ball bearing ball, said closable filling hole leading to said ball track.