| 主权项 |
1. A fuel injection valve comprising:
a body having a nozzle hole for injecting high-pressure fuel into a combustion chamber of an internal combustion engine; a nozzle needle movable back and forth in the body to open and close the nozzle hole; a control chamber configured to apply fuel pressure to the nozzle needle in a closing direction; a first intermediate chamber communicated with the control chamber through a control chamber communication passage and configured to receive high-pressure fuel through a high-pressure passage; a second intermediate chamber communicated with a low-pressure portion through an exhaust passage; a valve cylinder configured to partition the first intermediate chamber from the second intermediate chamber; a valve element movable in a cylinder hole, which is formed in the valve cylinder, to control communication between the control chamber communication passage and the high-pressure passage and to control communication between the exhaust passage and the second intermediate chamber; a valve element spring biasing the valve element in a direction to communicate the control chamber communication passage with the high-pressure passage and to block the exhaust passage from the second intermediate chamber; and an actuator configured to actuate the valve element in a direction to block the control chamber communication passage from the high-pressure passage and to communicate the exhaust passage with the second intermediate chamber, wherein the valve element includes: a high-pressure-side valve portion in an annular shape and configured to make contact with a high-pressure seat surface formed in the body and to move away from the high-pressure seat surface to control communication between the control chamber communication passage and the high-pressure passage; a low-pressure-side valve portion configured to make contact with a low-pressure seat surface formed in the body and to move away from the low-pressure seat surface to control communication between the exhaust passage and the second intermediate chamber; a releasing portion formed on a radially inside of the high-pressure-side valve portion and configured to communicate with the control chamber communication passage when the high-pressure seat surface is in contact with the high-pressure-side valve portion to block the control chamber communication passage from the high-pressure passage; and a valve element internal passage formed in the valve element and configured to communicate the releasing portion with the second intermediate chamber. |
