| 摘要 |
PROBLEM TO BE SOLVED: To adjust pressure of a high-pressure source by a simple structure, in a high-pressure fluid injection device having a structure for guiding a high- pressure fluid from the high-pressure source to an injector, for injection and control. SOLUTION: A plurality of injectors 11 are constituted so as to release high pressure of a control oil pressure chamber 204 to a low-pressure source through a spill valve 11b to lift a needle 3 for reducing the oil pressure acting on the needle 3 in the valve closing direction. In injecting, an electric load is supplied from a condenser 92 only to a piezostack 8 for operating the spill valve 11b of the injector 11, and the opening of the spill valve 11b is increased to open the spill valve 3. In excessive increasing of the high-pressure source, the electric load is distributed and supplied from the condenser 92 to the piezostack 8 of each injector 11, the spill valve 11b is opened with the small opening while the needle 3 is maintained in the closed state, and an excessive high-pressure fluid is released from the high-pressure source to the low-pressure source. |
