Denso Corporation

Hiroaki Kawamura

Masami Niimi

Yasuyuki Wakahara

Youichi Murakami

Kyoji Inukai

Teruo Kobayashi

Nobuyuki Yamashita

In a multilayer brush composed chiefly of copper and graphite and incorporated therein with a solid lubricant, which consists essentially of two types of brushes, a high-copper-content part brush containing the copper in a large quantity and a low-copper-content part brush containing the copper in a small quantity, at least the high-copper-content part brush contains zinc in an amount of from 0.1% by weight to 5% by weight, and the zinc and the copper form an alloy. This can provide a multilayer brush having a superior durability, which can prevent the performance of motors from lowering, without use of the harmful substance such as lead, and may less undergo any wear due to mechanical and electrical sparkling of the brush.

Growing community of inventors

Fukushima-ken, Japan

Hiroaki Kawamura