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Texturing of the seal surface for a roller cone rock bit

A sealing surface and surface structure technology, which is applied to the sealing of drill bits, engines, earthwork drilling, etc., can solve the problems of journal bearing scratches, wear, and seizure, and achieve the effect of reducing friction and prolonging the life of drill bits

Inactive Publication Date: 2011-05-04
山特维克矿山机械工程工具股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to scuffing, scuffing and even serious failure of the journal bearings such as galling or seizure

Method used

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  • Texturing of the seal surface for a roller cone rock bit
  • Texturing of the seal surface for a roller cone rock bit
  • Texturing of the seal surface for a roller cone rock bit

Examples

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Embodiment Construction

[0044] Surface texturing is used to modify the topography of one or more surfaces (radial, conical or cylindrical or otherwise) of a sealing system and / or bearing system of a roller cone bit. The surface texture creates a dimpled surface that retains additional lubricant that is beneficial in reducing friction at the interface and in the region of mixed lubrication. At least for the bearing surface, the surface coverage of the dimpled formation should exceed a minimum of 60%, more preferably between 70-90%, and even more preferably approach or reach approximately 100%. For sealing surfaces, a lighter shot peening (5-60%) can be applied.

[0045] Refer to Figure 1 and figure 2 , the textured surface in a sealing system to which surface texture is applied preferably includes any surface that has sliding contact with the sealing ring 60 when the cone rotates. This will include one or more surfaces of the gland 64 . More specifically, it will include at least the sealing hub 62...

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Abstract

Surface texturing is employed to modify the topography of one or more surfaces (radial or cylindrical) of the sealing system for a roller cone rock bit. The surface texturing results in a dimpled surface which retains additional lubricant helpful in reducing friction in the boundary and mixed lubrication regimes. Shot peening is disclosed as one method for texturing the desired surface.

Description

[0001] priority claim [0002] This application claims the benefit of US Provisional Application Patent Serial No. 61 / 036,762, filed March 14, 2008, the disclosure of which is hereby incorporated by reference. technical field [0003] This invention relates generally to earth-boring bits and more particularly to roller cone bits. Background technique [0004] A roller cone bit is a cutting tool used in the oil, gas and mining fields to penetrate the earth's rock formations to form a wellbore. The load and motion of the drill bit is transferred to bearings in the triple head and cone assembly. For drill bits using journal bearings, the main journal bearings carry as much as 80% of the total radial load. A main journal bearing consists of a head (as a shaft), a bearing liner (bearing pad, bushing) and a cone (as a bearing housing). Lubricate and seal such bearings. The outer periphery of the seal is compressed by the gland of the cone, so the seal moves with the cone and s...

Claims

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Application Information

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IPC IPC(8): E21B10/22E21B10/25F16C33/10
CPCB24C1/10C21D7/06E21B10/25F16J15/162F16J15/324Y10T29/479
Inventor X·路
Owner 山特维克矿山机械工程工具股份有限公司
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