Rock bit having a mechanical seal with superior thermal performance
AssigneeVarel International Ind., L.P.
InventorXiaobin Lu
Life of this patent
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Abstract
A drill tool includes a bit body, at least one bearing shaft extending from the bit body and a cone mounted for rotation on the bearing shaft. A mechanical seal is disposed between the bearing shaft and the cone in a seal gland. The mechanical seal includes a rigid seal ring having a dynamic sealing surface with the cone and another non-sealing surface exposed to an aperture in the seal gland. The mechanical seal further includes at least one cooling channel formed in the another non-sealing surface of the rigid seal ring, the cooling channel having an open end in fluid communication with the aperture in the seal gland.
Claims20
A drill tool, comprising:
- a bit body;
- at least one bearing shaft extending from the bit body;
- a cone mounted for rotation on the bearing shaft;
- and
- a mechanical seal disposed between the bearing shaft and the cone in a seal gland, the mechanical seal including a metal seal ring with a full metal body having a metal dynamic sealing surface in sliding contact with a metal surface associated with the cone and a metal non-sealing surface exposed to an aperture in the seal gland, the mechanical seal further including at least one cooling channel formed in the metal non-sealing surface and extending into the metal body of the metal seal ring, the cooling channel having an open end in fluid communication with the aperture in the seal gland.
Dependencies are inferred from the claim text.