| 摘要 |
PROBLEM TO BE SOLVED: To add 5 to 30 wt.% of a fibriform potassium titanate or montmorillonite to a carbon brush so as to solve the problems of the unevenness and abrasion of the surface of a commutator due to commutation sparks, between the carbon and the commutator of a fuel ejection pump. SOLUTION: An abrasive having lower rigidity, which consists at least either a montmorillonite having an average second particle diameter of 0.1 to 1μm of the brush, comprising mainly of carbon or of potassium titanate, having an average value of a fiber width of 0.2 to 0.6μm, is added to the carbon brush, causing the surface of the commutator to be smoothed; while slightly suppressing the abrasion effect on the carbon commutator, thereby suppressing the occurrence of the commutation sparks. Accordingly, durability of the fuel ejection pump commutator is increased. COPYRIGHT: (C)2008,JPO&INPIT
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