Carbon commutator and a method for production thereof
AssigneesDenso Corporation, TRIS Inc.
InventorsMakoto Nishio, Shinya Nakagawa, Yuya Nishino, Kenzo Kiyose, Takashi Fukutsuka
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Abstract
A segment of a carbon commutator includes a carbon layer on a surface side and a metallic carbon layer on a bottom side, and the carbon layer and the metallic carbon layer both contain a thermoplastic resin binder.
Claims6
A carbon commutator comprising a plurality of segments including a carbon layer on a surface side of the segments and a metallic carbon layer on a bottom side of the segments, the metallic carbon layer of the segments being fixed to a riser piece,
- wherein the carbon layer and the metallic carbon layer both contain at least a thermoplastic resin binder and wherein the metallic carbon layer contains electrolytic copper powder which remains in powder form after the metallic carbon layer has been fixed to the riser piece,
- wherein the metallic carbon layer contains electrolytic copper powder, brass powder, and tin,
- wherein the thermoplastic resin binder has a melting point of 230° C. to 400° C., and
- wherein the metallic carbon layer contains 5 to 40 mass % of electrolytic copper powder, 2 to 30 mass % of tin and 20 to 83 mass % of brass powder, with a total of 90 mass % or more of metal components, and further contains 0.3 to 4 mass % of thermoplastic resin binder and the remaining mass % of carbon.
A method for production of a carbon commutator comprising a plurality of segments including a carbon layer on a surface side of the segments and a metallic carbon layer on a bottom side of the segments, the metallic carbon layer of the segments being fixed to a riser piece,
- wherein a compression-molded article made of two layer materials, comprising a metallic carbon layer material containing carbon, a thermoplastic resin binder and metal powder, and a carbon layer material containing carbon and a thermoplastic resin binder is baked at a temperature from 230° C. to 400° C. and wherein the metallic carbon layer contains electrolytic copper powder which remains in powder form after the metallic carbon layer has been fixed to the riser piece,
- wherein the metallic carbon layer material contains carbon, a thermoplastic resin binder, brass powder, electrolytic copper powder, and tin powder, and
- wherein the metallic carbon layer material contains 5 to 40 mass % of electrolytic copper powder, 2 to 30 mass % of tin powder and 20 to 83 mass % of brass powder, with a total of 90 mass % or more of metal components, and further contains 0.3 to 4 mass % of thermoplastic resin binder and the remaining mass % of carbon.
A carbon commutator comprising a plurality of segments including a carbon layer on a surface side of the segments and a metallic carbon layer on a bottom side of the segments, the metallic carbon layer of the segments being fixed to a riser piece,
- wherein the carbon layer and the metallic carbon layer both contain at least a thermoplastic resin binder having a melting point of 230° C. to 400° C.,
- wherein the metallic carbon layer contains copper alloy powder and tin, and
- wherein the metallic carbon layer contains a total of 90 mass % or more of metal components and 0.3 to 4 mass % of thermoplastic resin binder with the remaining mass % of carbon and the carbon layer further contains a thermoplastic resin binder of the same chemical formula as that of the metallic carbon layer in an amount of 3 to 15 mass % and the remaining mass % of carbon.
Dependencies are inferred from the claim text.