Tris Inc.

Denso Corporation

Makoto Nishio

Shinya Nakagawa

Youichi Murakami

Kenzo Kiyose

Takashi Fukutsuka

Yuya Nishino

Kiyotoshi Oi

Yoichi Sakaura

Mitsuo Ikeda

Hirotake Hamamatsu

Ryoichi Honbo

Ryouichi Honbo

A laminated carbon brush for a liquid pump motor slides in a liquid fuel on a disk-like commutator. The laminated carbon brush includes two layers of a lower resistivity layer and a higher resistivity layer. In both the lower resistivity layer and the higher resistivity layer, circular directional resistivities of the brush along a circular direction in the rotation of the commutator are higher than non-circular directional resistivities of the brush along a radial direction of the commutator and a perpendicular direction to the sliding surface of the commutator. A non-circular directional resistivity of the higher resistivity layer are higher than or equal to 90,000 &#x3bc;&#x3a9;&#xb7;cm. No spark discharges occur if the fuel pump motor is operated to output a high power.

Laminate carbon brush for fuel pump motor

A carbon brush for a fuel pump includes a brush body and a lead wire connected to the brush body, and the brush body has carbon and polyether ether ketone as main components. Abnormal wear does not occur even if a fuel pump motor is operated at a high voltage.

Carbon brush for fuel pump and method for manufacturing same

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.

Carbon commutator and a method for production thereof

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

Growing community of inventors

Matsusaka, Japan

Makoto Nishio