Electromagnetic fuel pump
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
Nov 27, 2006
filing date -
Aug 18, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention can secure an improved pump operation while minimizing a loss of a magnetomotive force generated by an electromagnetic coil and making it possible to achieve a compact structure and a weight saving of an apparatus, in a plunger type electromagnetic fuel pump. In an electromagnetic fuel pump (1) which pressure-feeds a fuel by controlling a current application to an electromagnetic coil (5) and repeating generation and elimination of a magnetic force so as to slidably reciprocate a plunger (3) arranged in a cylinder (4) and having a proximal end side urged by a return spring (41), an insertion hole (35) for inserting the return spring (41) is provided from the proximal end surface of the plunger (3) at a predetermined depth along the center axis of the plunger (3), and the inner peripheral surface of the insertion hole (3) is formed as a spring guide retaining the outer peripheral leading end side of the return spring (41).
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