Roller cutter drill bit having a texturized seal member
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United States of America Patent
Stats
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Oct 28, 1986
Grant Date -
N/A
app pub date -
Sep 12, 1984
filing date -
Sep 12, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary drill bit comprising a bit body having at least one depending leg at its lower end having a generally cylindrical bearing journal, a roller cutter of generally conical shape having a recess therein receiving the journal a bearing system for rotatably mounting the roller cutter on the journal, and a lubrication system for providing lubricant to the bearing system comprising a reservoir of lubricant, passaging in the bit body for fluid communication between the reservoir and the bearing system, and a seal member between the roller cutter and the journal blocking flow of lubricant out of the bit body. The seal member is of annular shape and is held in a seal cavity between the roller cutter or the journal, with an annular engagement face thereof in sealing, sliding frictional engagement with one of the bearing members. The engagement face of the seal member has a surface texture such that, with the seal member compressed against the stated one bearing member, pockets are formed in the face thereof for holding lubricant for lubricating the seal member, yet the face is effective to substantially block leakage past the seal member.
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