Metal-carbonaceous brush and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10199789-B2
Application number	US-201415026784-A
Country	US
Kind code	B2
Filing date	Oct 1, 2014
Priority date	Oct 2, 2013
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A carbonaceous material is fabricated by a mixture of carbon powder and a binder. 10% by weight or more and 60% by weight or less of metal powder to the fabricated carbonaceous material is mixed. The mixed carbonaceous material and metal powder are pressurized and formed. A brush base material is fabricated by burning of the pressurized and formed carbonaceous material and metal powder. The fabricated brush base material is impregnated with oil. An impregnation rate of the oil to the mixed carbonaceous material and metal powder may be 0.5% by weight or more, for example.

First claim

The invention claimed is:

1. A metal-carbonaceous brush including:
a carbonaceous material made of a plurality of carbonaceous particles;
metal mixed with the carbonaceous material; and
oil with which the carbonaceous material is impregnated, wherein
a ratio of the metal mixed with the carbonaceous material to the carbonaceous material is 10% by weight or more and 60% by weight or less and the oil is a mixed oil of 90% by weight or more and 99% by weight or less of a petroleum hydrocarbon oil and 1 by weight or more and 10% by weight or less of a silicone oil, or the oil is a mixed oil of 90% by weight or more and 99.5°/o by weight or less of the petroleum hydrocarbon oil and 0.5% by weight or more and 10% by weight or less of a dimethyl silicone oil.

2. The metal-carbonaceous brush according to claim 1 , wherein
an impregnation rate of the oil to the mixed carbonaceous material and metal is 0.5% by weight or more.

3. The metal-carbonaceous brush according to claim 1 , wherein
a decrease of an impregnation ratio of the oil is 1% or less in 400 hours in an atmosphere having a temperature of 120° C.

4. The metal-carbonaceous brush according to claim 1 , wherein
the oil includes a synthetic hydrocarbon oil, an ester oil, a mineral oil or a petroleum hydrocarbon oil, or a mixed oil of these.

5. The metal-carbonaceous brush according to claim 4 , wherein
the oil is a mixed oil of 90% by weight or more and 99% by weight or less of the synthetic hydrocarbon oil and 1% by weight or more and 10% by weight or less of a silicone oil.

6. The metal-carbonaceous brush according to claim 4 , wherein
the oil is a mixed oil of 90% by weight or more and 99.5% by weight or less of the synthetic hydrocarbon oil and 0.5% by weight or more and 10% by weight or less of a dimethyl silicone oil.

7. The metal-carbonaceous brush according to claim 1 , wherein
the metal includes electrolytic copper powder.

8. A method of manufacturing a metal-carbonaceous brush including the steps of:
fabricating a carbonaceous material by mixing carbon powder and a binder;
mixing 10% by weight or more and 60% by weight or less of metal to the fabricated carbonaceous material;
forming the mixed carbonaceous material and metal;
thermally processing the formed carbonaceous material and metal; and
impregnating the thermally processed carbonaceous material with oil.

9. The method of manufacturing the metal-carbonaceous brush according to claim 8 , wherein
the step of forming the carbonaceous material and metal includes pressurizing the carbonaceous material and metal such that the carbonaceous material and metal have a specific gravity of 2.26 g/cm 3 or less.

10. The method of manufacturing the metal-carbonaceous brush according to claim 8 , wherein
the step of impregnation with oil includes immersing the carbonaceous material and metal in oil having a temperature of 80° C. or more and 120° C. or less.

11. The method of manufacturing the metal-carbonaceous brush according to claim 10 , wherein
the step of impregnation with oil includes immersing the carbonaceous material and metal in oil having a temperature of 90° C. or more and 110° C. or less.

Assignees

• Toyo Tanso Co
• Totan Kako Co Ltd

Inventors

• Hozumi Fumihiro

Classifications

• H02K15/02

  of stator or rotor bodies · CPC title

• H02K13/00

  Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings (supporting or protecting brushes or brush holders in motor casings or enclosures H02K5/14); Disposition of current collectors in motors or generators; Arrangements for improving commutation · CPC title

• H01R39/20 Primary

  characterised by the material thereof · CPC title

• C04B2235/604

  Pressing at temperatures other than sintering temperatures · CPC title

• C04B2235/48

  Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins · CPC title