| 摘要 |
A seal structure (30) of a fuel injection valve, comprising an annular seal member (31) installed in a pressure lead-in chamber (21) to seal a high-pressure fuel in the pressure lead-in chamber (21) so that the fuel does not leak to a low pressure side through a clearance (28) formed between an injector housing (2) and a valve body (6) in which a valve piston (5) is slidably inserted. A rigid backup ring (32) is disposed between the clearance (28) and the seal member (31), and a recessed part (33) allowing the seal member (31) to be intruded therein by its elasticity is formed in the pressure lead- in chamber (21). In particular, when the seal member (31) is pressed against the backup ring (32) by the high-pressure fuel, the seal member (31) is deformed and a part thereof is firmly intruded into the recessed part (33). Thus, the seal member (31) can be prevented from being raised.
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