Laminate carbon brush for fuel pump motor
AssigneeTRIS Inc.
InventorsMakoto Nishio, Yuya Nishino
Life of this patent
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Abstract
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 μΩ·cm. No spark discharges occur if the fuel pump motor is operated to output a high power.
Claims12
A laminated carbon brush for a liquid pump motor sliding on a sliding surface of a disk-like commutator in a liquid fuel comprising:
- at least two layers of a lower resistivity layer and a higher resistivity layer,
- wherein regarding 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 along a perpendicular direction to the sliding surface of the commutator,
- and wherein a non-circular directional resistivity of the higher resistivity layer is higher than or equal to 90,000 μΩ·cm.
Dependencies are inferred from the claim text.