| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve achieving prevention of unintended lift of a needle valve caused by thermal expansion difference between a displacement element and a needle valve with receiving no restriction of material and dimension, increasing degree of freedom in design and reducing cost in the fuel injection valve lifting the needle valve by the displacement element such as a piezoelectric element. SOLUTION: This valve is provided with the displacement element 7 stored in an injector body 2 for lifting the needle valve 5 and extending in operation, and an intermediate body 8 put between the displacement element 7 and the needle valve 5 and not transmitting extension of the displacement element 7 to the needle valve 5 when the displacement element 7 slowly extends by thermal expansion. The intermediate body 8 consists of a drive member 9 moving the needle valve 5 in a slide direction S, a driven member 10 separated from the drive member 9 by a predetermined gap Tc, liquid filled in the predetermined gap Tc, and a restrictor 11 giving predetermined resistance on liquid leaving from the predetermined gap Tc when the drive member 9 gets close to the driven member 10. COPYRIGHT: (C)2007,JPO&INPIT
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