Patent ID: 8246005
Filing Date: 2012-08-21
Classification: F02M,Y10T

Abstract:
1. An electromagnetic fuel injection valve, in which a valve housing includes: a tubular valve seat member having a valve seat in a front end portion thereof; a magnetic cylindrical body coaxially connected to a rear end portion of the valve seat member; a nonmagnetic cylindrical body coaxially and liquid-tightly welded to a rear end of the magnetic cylindrical body; and a hollow cylindrical stationary core coaxially and liquid-tightly welded to a rear end of the nonmagnetic cylindrical body, a valve assembly is housed in the valve housing and includes: a valve body capable of being seated on the valve seat; and a movable core connected to a rear end of the valve body, a suction tubular part projecting toward an inside of the nonmagnetic cylindrical body is provided to a front end portion of the stationary core, and a front end of the suction tubular part and a rear end of the movable core are opposed to each other in the inside of the nonmagnetic cylindrical body, wherein an annular gap is defined between an outer peripheral surface of the suction tubular part and an inner peripheral surface of the nonmagnetic cylindrical body, the annular gap extending uninterrupted from a point where the stationary core contacts the nonmagnetic cylindrical body to the front end of the suction tubular part, the annular gap allowing influx of a pressure fluid used for a check of liquid-tightness between the nonmagnetic cylindrical body and the stationary core.