Patent ID: 7404388
Filing Date: 2008-07-29
Classification: F02M,Y10T

Abstract:
1. A system for automatically changing fuel passages for a diesel engine, the system comprising: a case including a pump port connected to an inlet of a high-pressure pump, a return line port provided with a fuel return line connected to a common rail and the high-pressure pump, a first variable port connected to a fuel filter, and a second variable port connected to a fuel tank; a rotary member including an initial supply passage that is rotatably provided in the case and connects the pump port to the first variable port before the rotation of the rotary member, an initial return passage that connects the return line port to the second variable port before the rotation of the rotary member, a final supply passage that connects the pump port to the second variable port after the rotation of the rotary member, and a final return passage that connects the return line port to the first variable port after the rotation of the rotary member; a pressure switching unit maintaining a pre-rotation state of the rotary member and allowing the rotary member to rotate with respect to the case when pressure in the fuel return line increases to a level higher than a predetermined pressure; and an elastic member rotating the rotary member with respect to the case when the rotary member is switched into a rotatable state by the pressure switching unit.