Patent ID: 7614604
Filing Date: 2009-11-10
Classification: F02M

Abstract:
1. An electromagnetic fuel injection valve including a valve assembly ( 20 ) in which a fixed core ( 28 ) is connectingly provided at a rear end of a valve housing ( 8 ) having a valve seat ( 13 ) in a front end part thereof, and a valve element ( 19 ) having a valve part ( 19 a ) capable of being seated on the valve seat ( 13 ) and a valve shaft part ( 19 b ) connecting to the valve part ( 19 a ) and a movable core ( 18 ) opposed to the fixed core ( 28 ) are integrally connected to each other, the valve assembly ( 20 ) being contained in the valve housing ( 8 ) by being urged by spring to the side on which the valve part ( 19 a ) is seated on the valve seat ( 13 ), a first journal part ( 21 ) close to the valve seat ( 13 ) and a second journal part ( 22 ) separated from the first journal part ( 21 ) to the rear side in the axial direction being provided in the valve assembly ( 20 ) so as to be slidably supported by guide holes ( 14 , 15 ) provided in the valve housing ( 8 ), characterized in that the outside surface of the first journal part ( 21 ) is formed by a sliding surface ( 45 ) slidable on the inside surface of the guide hole ( 14 ) and a pair of tapered tilt surfaces ( 46 , 47 ) connecting to both the front and rear sides of the sliding surface ( 45 ); at least the tilt surface ( 47 ) on the movable core ( 18 ) side, of the both tilt surfaces ( 46 , 47 ), is formed of a first tilt surface part ( 47 a ) connecting to an end part of the sliding surface ( 45 ) provided along the axis line of the valve shaft part ( 19 b ) and a second tilt surface part ( 47 b ) connecting to the first tilt surface part ( 47 a ); and an angle that the first tilt surface part ( 47 a ) makes with a plane perpendicular to the axis line of the valve shaft part ( 19 b ) is set larger than an angle that the second tilt surface part ( 47 b ) makes with said plane.