Tris Inc.

Denso Corporation

Yuya Nishino

Makoto Nishio

Kenzo Kiyose

Shinya Nakagawa

Takashi Fukutsuka

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 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.

Growing community of inventors

Mie, Japan

Yuya Nishino