| 摘要 |
<P>PROBLEM TO BE SOLVED: To maintain fuel pressure in an accumulation chamber at predetermined pressure when a high pressure fuel pump is stopped. Ž<P>SOLUTION: A housing (cylinder 80) has a compression chamber 18, a discharge passage 83 for connecting the compression chamber 18 with the accumulation chamber (delivery pipe 4), and a return passage 85 for connecting the compression chamber side of the discharge passage with the accumulation chamber side. A discharge valve 20 is stored in the discharge passage, and is opened to supply compression chamber fuel to the accumulation chamber when the compression chamber pressure becomes predetermined pressure or more. A releaf valve 30 has a first valve element 32 stored in the return passage, and is closed until accumulation chamber internal pressure exceeds first pressure higher than pressure in ordinary operation, and is opened when the first pressure is exceeded. A pressure holding mechanism 40 has a fuel passage 41 formed inside the first valve element 32 and connecting a compression chamber side return passage with an accumulation chamber side return passage in a valve closing state of the releaf valve, and a second valve element (needle 47) stored in the fuel passage, and is closed when the accumulation chamber internal pressure reduces to second pressure lower than the pressure in the ordinary operation. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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