| 摘要 |
A method of providing a selected bearing couple in a journal bearing of a rotary rock bit is described, wherein differential thermal expansion is used to mate a thin walled bushing of a chosen bearing alloy to one of the steel structural members. A pre-finished and pre-heat treated thin walled bushing is formed of the desired bearing alloy. Very little valuable space is required by the thin walled bushing. The use of arc-deposited metal, press fitting, or of loose parts is avoided, and many potential bearing alloys are adaptable as candidates for use in such a bushing.
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