Patent ID: 7520267
Filing Date: 2009-04-21
Classification: F02M

Abstract:
1. A fuel injection apparatus comprising: a high-pressure passage configured to be filled with high-pressure fuel; a low-pressure passage configured to be filled with low-pressure fuel; an actuator; a first piston configured to be displaced by the actuator; a second piston; a displacement amplifying chamber communicating with the low-pressure passage, the displacement amplifying chamber working to amplify and transmit to the second piston a displacement of the first piston by means of the low-pressure fuel therein; a fuel injection mechanism configured to inject the high-pressure fuel into a cylinder of an internal combustion engine in response to the displacement of the second piston; and a fuel supplier working to supply the high-pressure fuel from the high-pressure passage through pressure reduction directly to the low-pressure passage without any device interposed between the fuel supplier and the low-pressure pressure passage, thereby minimizing a time required to fill up the displacement amplifying chamber with the low-pressure fuel after start of the engine.