| 摘要 |
PROBLEM TO BE SOLVED: To reduce a drive force of an actuator which is required for maintaining a closed state between a control chamber passage and a high-pressure passage by a valve body (that is, needle valve-closed state).SOLUTION: An annular high-pressure side valve part 521 which opens and closes a clearance between a control chamber communication passage 91 and a high-pressure passage 92, and an escape part 522 which is formed at an internal peripheral side of the high-pressure side valve part 521, and brought into a communication state communicating with the control chamber communication passage 91 at a needle valve-closed state are arranged at one end side of a first valve body 52. A valve body inner passage 523 which communicates with a low-pressure part via a discharge passage 84, and makes a second intermediate chamber 82 and the escape part 522 communicate with each other is arranged in the first valve body 52. By this constitution, since the pressure of a control chamber which is controlled to low pressure lower than that of high-pressure fuel acts on the escape part 522 at the needle valve-closed state, and a force energized to a direction in which the first valve body 52 withstands a drive force of an actuator by the pressure acting on the escape part 522 becomes small.SELECTED DRAWING: Figure 3 |
