Rock bit seal with multiple dynamic seal surface elements
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
Seals of this invention comprise an annular elastomeric ring-shaped body having a dynamic surface disposed along a first body portion, the dynamic surface comprising at least two surface elements that project outwardly therefrom to provide multiple barriers to fluid and debris migration thereacross when placed into contact with a rock bit rotary dynamic surface. The seal dynamic surface includes a recessed portion disposed between the surface elements, and a static seal surface disposed along a second body portion. At least one of the surface elements includes a wear surface that is formed from a material that is more wear resistant than materials that are used to form a remaining portion of the seal. A preferred wear surface is one formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material. Seals of this invention provide improved properties of both wear resistance and sealability when compared to conventional seals having a single dynamic seal surface.
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Citations
67 Claims
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1. A rotary cone rock bit comprising;
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A rotary cone rock bit comprising:
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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 ring forming a lubricant seal between the cone and journal, the seal ring comprising;
a seal body having a dynamic seal surface at one body location and a static seal surface at another body location, wherein the dynamic seal surface comprises at least two surface elements that each project outwardly a distance away from the seal body for placement against a rock bit rotary dynamic surface, and wherein seal dynamic surface comprises a recessed portion prior to installation within the rock bit that extends circumferentially around the dynamic seal surface between the surface elements, wherein the dynamic surface elements are integral with one another and each formed from a common elastomeric material, and wherein the seal ring has an aspect ratio greater than one. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A rotary cone rock bit comprising:
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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 ring forming a lubricant seal between the cone and journal, the seal ring comprising;
a seal body having a dynamic seal surface at one body location and a static seal surface at another body location, wherein the dynamic seal surface comprises at least two surface elements that each project outwardly a distance away from the seal body for placement against a rock bit rotary dynamic surface, the seal dynamic surface comprising a recessed portion prior to installation within the rock bit that extends circumferentially around the dynamic seal surface between the surface elements, wherein the dynamic surface elements are integrally formed from a common elastomeric material that is different than a material that is used to form the seal body, and wherein at least one of the surface elements has a wear layer disposed thereover that is formed from a composite comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material. - View Dependent Claims (51, 52)
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53. A rotary cone rock bit comprising:
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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 ring forming a lubricant seal between the cone and journal, the seal-ring comprising;
a seal body having a dynamic seal surface at one body location and a static seal surface at an opposite body location, wherein the dynamic seal surface comprises at least two surface elements that project outwardly therefrom before being installed within the rock bit, the surface elements being separated by a recessed portion that extends circumferentially around the dynamic seal surface;
wherein one of the cutter cone or journal includes a rotary dynamic surface that is placed against the seal dynamic surface, the rotary dynamic surface having a raised portion that extends circumferentially therearound and that cooperates with the seal recessed portion. - View Dependent Claims (54, 55, 56, 57, 58)
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59. A rotary cone rock bit comprising;
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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 the same material, and wherein one of the surface elements includes a wear surface disposed thereon that is formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material, wherein the rock bit rotary dynamic surface comprises a raised portion that is positioned adjacent the seal recessed portion; and
a static seal surface disposed along another seal body portion. - View Dependent Claims (60, 61, 62)
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63. A rotary cone rock bit comprising:
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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 ring forming a lubricant seal between the cone and journal, the seal ring comprising;
a seal body having a dynamic seal surface at one body location and a static seal surface at another body location, wherein the dynamic seal surface comprises at least two surface elements that each project outwardly a distance away from the seal body for placement against a rock bit rotary dynamic surface, and wherein seal dynamic surface comprises a recessed portion prior to installation within the rock bit that extends circumferentially around the dynamic seal surface between the surface elements, wherein at least one of the surface elements is formed from the same material as the seal body or as another surface element, and wherein the seal ring has an aspect ratio greater than one;
wherein the rock bit rotary dynamic surface comprises a raised portion that is positioned adjacent the seal recessed portion. - View Dependent Claims (64, 65, 66)
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67. A rotary cone rock bit comprising:
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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 ring forming a lubricant seal between the cone and journal, the seal ring comprising;
a seal body having a dynamic seal surface at one body location and a static seal surface at another body location, wherein the dynamic seal surface comprises at least two surface elements that each project outwardly a distance away from the seal body for placement against a rock bit rotary dynamic surface, and wherein seal dynamic surface comprises a recessed portion prior to installation within the rock bit that extends circumferentially around the dynamic seal surface between the surface elements, wherein at least one of the surface elements is formed from the same material as the seal body or as another surface element, and wherein the seal ring has an aspect ratio greater than one;
wherein the seal dynamic surface is formed from a material that is different than that used to form the seal body, and wherein the seal dynamic surface is not vulcanized to the seal body.
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Specification