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Rock bit seal with multiple dynamic seal surface elements

  • US 6,536,542 B1
  • Filed: 10/28/1999
  • Issued: 03/25/2003
  • Est. Priority Date: 10/28/1999
  • Status: Expired due to Term
First Claim
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1. A rotary cone rock bit comprising;

  • a bit body;

    at least one journal extending inwardly and downwardly from a lower portion of the bit body;

    a cutter cone mounted for rotation on the journal; and

    an annular elastomeric seal forming a lubricant seal between the cone and journal, the seal having a substantially ring-shaped seal body comprising;

    a dynamic seal surface disposed along one seal body portion and including two surface elements projecting outwardly therefrom prior to placement within the rock bit against a rock bit rotary dynamic surface, the surface elements being separated by a recessed portion that extends circumferentially along the dynamic seal surface, wherein the surface elements are each formed from a common elastomeric material, and wherein one of the surface elements includes a wear layer disposed thereover that is formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material; and

    a static seal surface disposed along another seal body portion.

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