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US 4,738,322 AGranted
Polycrystalline diamond bearing system for a roller cone rock bit
AssigneeSmith International, Inc.
InventorsDavid R. Hall, Donald G. Cross
Life of this patent
Estimating the term…
Abstract
A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a main journal bearing which is substantially frustoconically shaped and a main roller cone bearing which is reverse shaped to mate with the journal bearing. The journal and roller cone bearings comprise polycrystalline diamond. The invention also includes a means for retaining the roller cone on the journal.
Claims11
A roller cone rock bit comprising:
- a main bit body with at least one downwardly extending leg;
- a journal on each leg having a proximate portion which is adjacent to the leg and a distal portion which extends away from the leg;
- a roller cone rotatably mounted on each journal;
- a frusto-conically shaped main journal bearing surface on the distal portion of each journal;
- a main roller cone bearing surface on each roller cone adapted to mate with the main journal bearing surface;
- a cone retention bearing surface for each journal;
- and
- retention means for retaining the roller cone on each journal which means is attached to the cone and which has a bearing surface adapted to mate with the cone retention bearing surface on the journal;
- wherein the main journal bearing surface, the main roller cone bearing surface, the cone retention bearing surface, and the retention means bearing surface each comprise polycrystalline diamond.
6 more elements
A roller cone rock bit comprising:
- a main bit body with at least one downwardly extending leg;
- a journal on each leg having a proximate portion which is adjacent to the leg and a distal portion which extends away from the leg;
- a roller cone rotatably mounted on each journal;
- a frusto-conically shaped main journal bearing surface on the distal portion of each journal;
- a main roller cone bearing surface on each roller cone adapted to mate with the main journal bearing surface;
- a cone retention bearing surface on the proximate portion of each journal;
- and
- retention means for retaining the roller cone on each journal which means is attached to the cone and which has a bearing surface adapted to mate with the cone retention bearing surface on the journal;
- wherein the main journal bearing surface, the main roller cone bearing surface, the cone retention bearing surface, and the retention means bearing surface each comprise polycrystalline diamond.
6 more elements
A roller cone rock bit comprising:
- a main bit body with at least one downwardly extending leg;
- a journal mounted on each leg and having a proximate portion which is adjacent to the leg and a distal portion which extends away from the leg;
- a roller cone rotatably mounted on each journal;
- a frusto-conically shaped main journal bearing surface comprising inserts with polycrystalline diamond bearing surfaces inserted in holes in the distal portion of each journal;
- a main roller cone bearing surface on each roller cone adapted to mate with the main journal bearing surface and comprising inserts with polycrystalline diamond bearing surfaces;
- a frusto-conically shaped cone retention bearing surface on the proximate portion of each journal which is arranged such that the diameter of the cone retention bearing surface becomes smaller moving toward the leg, the cone retention bearing surface comprising inserts with polycrystalline diamond bearing surfaces;
- and
- a retention ring for retaining the roller cone on each journal which ring is threaded into each cone and which has a bearing surface adapted to mate with the cone retention bearing surface on the journal and which comprises inserts with polycrystalline diamond bearing surfaces.
5 more elements
Dependencies are inferred from the claim text.