Fuel pump and manufacturing method thereof
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United States of America Patent
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Sep 3, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jan 15, 2016
filing date -
Jan 23, 2015
priority date (Note) -
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Abstract
A suction side end part of a suction guide passage and a discharge side end part of a discharge guide passage are opposed to each other with a gap therebetween. At a deviation angle at which contraction of a pump chamber starts, an outer peripheral part of the discharge side end part is formed along an inner tooth, and an inner peripheral part of the discharge side end part is formed along an outer tooth. A working tool that rotates and cuts circularly is moved around on a pump housing in a single continuous line to form an outline of the discharge guide passage, thereby forming the discharge guide passage. The working tool is moved around on the pump housing in a single continuous line to form an outline of the suction guide passage, thereby forming the suction guide passage.
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