Electromagnetic Fuel Injector and Method for Assembling the Same
AssigneeHitachi, Ltd.
InventorsMasahiko HAYATANI, Motoyuki Abe, Atsushi Sekine, Tohru Ishikawa
Life of this patent
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Abstract
An electromagnetic fuel injection valve comprising: a metallic cylindrical-shaped vessel provided at a tip end thereof with a fuel injection port, the other end thereof being closed by a stationary core provided centrally thereof with a through-hole; a movable member arranged between the stationary core and the fuel injection port and provided at a tip end thereof with a valve element, which opens and closes the fuel injection port, a maximum outside diameter of the movable member being smaller than a minimum inside diameter of the through-hole; and an electromagnetic drive mechanism that reciprocates the movable member.
Claims9
An electromagnetic fuel injection valve comprising:
- a movable member having a valve element arranged to come into contact with a valve seat at a tip end thereof;
- an anchor arranged for relative movement with respect to the movable member in a reciprocating direction;
- a stationary core and a yoke to form a magnetic circuit with the anchor;
- a coil configured to generate a magnetic flux in the magnetic circuit with the anchor;
- a first spring arranged to urge the movable member in a valve closing direction;
- a second spring arranged to urge the anchor in a valve opening direction with an urging force smaller than that of the first spring;
- a metallic cylindrical-shaped vessel including a large diameter portion and a small diameter portion which is formed integrally with the large diameter portion of the same material, with the coil and the yoke being arranged on an outer circumference surface of the large diameter portion and the stationary core being arranged on an inner circumference surface of the large diameter portion, and
- a spring seat member constituting a spring seat for the second spring arranged on an inner circumference surface of the metallic cylindrical-shaped vessel located on a side of the small diameter portion with respect to the stationary core, wherein
- the second spring and the anchor are accommodated within a space of the metallic cylindrical-shaped vessel partitioned by the spring seat member and the anchor.
Dependencies are inferred from the claim text.