| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a tip of a magnetostrictive element is chipped by repetition of highly-responsive operation, a magnetostriction amount is decreased by deteriorated fuel or the magnetostrictive element is broken at the worst, causing a very large drop in flow rate of a fuel injection valve. SOLUTION: Preload can be dispersed over an end of the magnetostrictive element by disposing a preload dispersion member, which is formed with a spherical surface on one side and with a flat surface on the other side, between the magnetostrictive element and a member applying the preload. The above problem is solved by avoiding stress concentration by the preload on a part of the magnetostrictive element. It is necessary to prevent the magnetostriction amount of the magnetostrictive element from being decreased by the deteriorated fuel and prevent the magnetostrictive element from being broken at the worst, and therefore, the deteriorated fuel is prevented from eroding a surface of the magnetostrictive element by coating the surface of the magnetostrictive element. COPYRIGHT: (C)2007,JPO&INPIT
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