Patent ID: 7789322
Filing Date: 2010-09-07
Classification: F02M

Abstract:
1. A fuel injection valve comprising: a main body having a nozzle hole and a compression chamber, the compression chamber adapted to accumulating fuel; a compression unit for pressurizing fuel in the compression chamber; a valve element being axially movable in the main body, the valve element including a valve portion and a pressure-receiving portion, the valve portion being movable in an opening direction to open the nozzle hole in response to pressure of fuel being pressurized by the compression unit and applied to the pressure-receiving portion; and a regulating unit provided in the compression chamber for regulating movement of the valve element with respect to the opening direction, wherein the regulating unit includes a projection and a contact portion, the projection projects from a sidewall of the valve element to the compression chamber, the sidewall being exposed to the compression chamber, the contact portion is provided to an inner wall of the main body, the inner wall being exposed to the compression chamber, the contact portion is adapted to being in contact with the projection when the valve element moves in the opening direction by a predetermined distance, the compression unit includes a piston and a driving device, the driving device is adapted to biasing the piston to reduce a volume of the compression chamber for pressurizing fuel in the compression chamber, the main body includes a partition provided in the compression chamber to divide the compression chamber into a first chamber and a second chamber, the second chamber is located closer to the nozzle hole than the first chamber, the second chamber accommodating the pressure-receiving portion, the first chamber and the nozzle hole are located on opposite sides of the second chamber, the first chamber accommodating the piston, the partition has a communication passage, which communicates the first chamber with the second chamber, the communication passage has an opening on the side of the second chamber, and the opening is located closer to the nozzle hole than the pressure-receiving portion.