Tris Inc.

Denso Corporation

Other

Mitsuo Ikeda

Yoichi Sakaura

Youichi Murakami

Takayoshi Otani

Masami Niimi

Yasuyuki Wakahara

Kyoji Inukai

Naoki Morita

Takahiro Sakamoto

Toshio Ishikawa

Osamu Takada

Kenzo Kiyose

Makoto Nishio

Hirotake Hamamatsu

Shinya Nakagawa

Ryoichi Honbo

Hirotada Kanagawa

Ryochi Honbo

Mitsuhiro Hirota

Yoshihiro Nishimura

The metal graphite grounding brush including silver is made in slide contact with a peripheral surface of an axle and grounds the axle. The mass ratio between silver and carbonaceous components including a volatile component in the brush is silver above 30% and up to 90% and carbonaceous components less than 70% and down to 10%. When the total of silver and carbonaceous components is made 100%, the volatile component is down to 2.0% and up to 15%. The brush grounds the axle reliably so that noise from a car radio is reduced and has a long service life and mechanical strength.

Metal graphite grounding brush mainly composed of silver and method for producing same

In a commutator of a rotary electric machine, each of commutator segments has a low-resistive layer made of a low-resistive material and a high-resistive layer made of a high-resistive material having a specific resistance higher than that of the low-resistive material. The low-resistive material contains a carbonic material and a binder. The high-resistive material contains a carbonic material, a binder and an inorganic substance such as boron nitride. A mixing ratio of the inorganic material to the high-resistive material is more than 20 wt %. Alternatively, a brush, which makes contact with the commutator segments, can have the high-resistive layer and the low-resistive layer.

Brush, commutator, and commutator device

A brush bodyof a metal-graphite brushis composed of a commutator side portionwhich contains graphite, copper and a metal sulfide solid lubricant, and a lead side portionwhich contains graphite and copper but does not contain any metal sulfide solid lubricant. A lead wireis attached to the lead side portioncontaining no metal sulfide solid lubricant.

Metal-graphite brush

A metal-graphite brush comprises a brush body which is made by mixing and molding metal powder and graphite powder. 2 mg to 30 mg as amounts of phosphate ion of at least one of phosphoric acid and a phosphate compound is added to 1 g of the brush body of the metal-graphite brush.

Ag particles produced by chemical reduction and having a mean particle size of 5 &mgr;m are added by 0.05-3 wt % and Zn are added by 2-10 wt % to a Pb-less brush body containing graphite, Cu and a metal sulfide solid lubricant of a metal-graphite brush.

Metal-graphite brush and production method thereof

A brush body of a metal-graphite brush is composed of a Pb-less commutator side portion which contains graphite, copper and a metal sulfide solid lubricant, and a lead side portion which contains graphite, copper, the metal sulfide solid lubricant and Pb.

A metal-graphite brush has a copper-graphite brush body to which a metal sulfide solid lubricant is added and a lead embedded. Indium is at least added to an interface between the brush body and the lead in a concentration of 0.4-8 wt %.

Growing community of inventors

Matsusaka, Japan

Mitsuo Ikeda