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US 6,637,528 B2Granted
Bit apparatus
AssigneeJapan National Oil Corporation
InventorsAkio Nishiyama, Osamu Nakamura, Kazutaka Kanda, Masahiro Arai, Kunio Komaki
Life of this patent
Estimating the term…
Abstract
A bit apparatus in which a cutter member having cutting teeth is axially supported on a shaft for rotation about the shaft, and a bearing mechanism is interposed between the cutter member and the shaft. The bearing mechanism includes at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load. The radial bearing has a shaft-side split bearing member and a cutter-side split bearing member that are opposed to or in sliding contact with each other and capable of rotating relative to each other.
Claims14
A bit apparatus including:
- a) a shaft having an engaging portion;
- b) a cutter member having cutting teeth axially supported on said shaft for rotation about said shaft;
- and
- c) a bearing mechanism interposed between said cutter member and said shaft;
- wherein:
- said bearing member comprises at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load;
- said radial bearing includes a shaft-side split bearing member and a cutter-side split bearing member;
- said shaft-side split bearing member has an engaged portion for engaging said engaging portion in such a manner that said shaft-side split bearing member co-rotates with said shaft;
- said shaft-side split bearing member and said cutter-side split bearing member are rotatable relative to each other;
- and
- a diamond film on at least one of said shaft-side split bearing member and cutter-side split bearing member and on mutually opposing surfaces of both said shaft-side split bearing member and said cutter-side split bearing member.
8 more elements
A bit apparatus including:
- a) a shaft having an engaging portion;
- b) a cutter member having cutting teeth axially supported on said shaft for rotation about said shaft;
- and
- c) a bearing mechanism interposed between said cutter member and said shaft;
- wherein:
- said bearing mechanism comprises at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load;
- said thrust bearing including a shaft-side split bearing member and a cutter-side split bearing member;
- said shaft-side split bearing member has an engaged portion for engaging said engaging portion in such a manner that said shaft-side split bearing member co-rotates with said shaft;
- said shaft-side split bearing member and said cutter-side split bearing member are in sliding contact and rotatable relative to each other;
- and
- a diamond film on at least one of said shaft-side split bearing member and cutter-side split bearing member and on sliding-contact surfaces thereof.
8 more elements
A bit apparatus including:
- a) a shaft;
- b) a cutter member having an engaging portion and cutting teeth axially supported on said shaft for rotation about said shaft;
- and
- c) a bearing mechanism interposed between said cutter member and said shaft;
- wherein:
- said bearing member comprises at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load;
- said radial bearing includes a shaft-side split bearing member and a cutter-side split bearing member;
- said cutter-side split bearing member has an engaged portion for engaging said engaging portion in such a manner that said cutter-side split bearing member co-rotates with said cutter member;
- said shaft-side split bearing member and said cutter-side split bearing member are rotatable relative to each other;
- and
- a diamond film on at least one of said shaft-side split bearing member and cutter-side split bearing member and on mutually opposing surfaces of both said shaft-side split bearing member and said cutter-side split bearing member.
8 more elements
A bit apparatus including:
- a) a shaft;
- b) a cutter member having an engaging portion and cutting teeth axially supported on said shaft for rotation about said shaft;
- and
- c) a bearing mechanism interposed between said cutter member and said shaft;
- wherein:
- said bearing mechanism comprises at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load;
- said thrust bearing including a shaft-side split bearing member and a cutter-side split bearing member;
- said cutter-side split bearing member has an engaged portion for engaging said engaging portion in such a manner that said cutter-side split bearing member co-rotates with said cutter member;
- said shaft-side split bearing member and said cutter-side split bearing member are in sliding contact and rotatable relative to each other;
- and
- a diamond film on at least one of said shaft-side split bearing member and cutter-side split bearing member and on sliding-contact surfaces thereof.
8 more elements
Dependencies are inferred from the claim text.