Fuel Injection Valve and Method for Manufacturing Fuel Injection Valve
AssigneeHitachi Automotive Systems, Ltd.
InventorsAkihiro YAMAZAKI, Takahiro SAITO, Nobuaki KOBAYASHI
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Abstract
This fuel injection valve is provided with a needle having a valve body (27c) and a rod part (27b) of which one end is bonded by welding to the valve body (27c). A contact portion (81) between the rod part (27b) and the valve body (27c) is disposed nearer to a valve shaft center (27x) than is a weld-penetration portion (80) created by the weld-bonding of the rod part (27b) and the valve body (27c), and a non-welded portion (82) is provided between the contact portion (81) and the weld-penetration portion (80).
Claims7
A fuel injection valve comprising a movable element, wherein:
- the movable element includes:
- a movable core;
- a valve element;
- and
- a rod part connected between the movable core and the valve element and including a first end welded to the valve element;
- the rod part and the valve element include an abutment portion at which the rod part abuts the valve element;
- the rod part and the valve element include a weld penetration portion produced by welding of the rod part and the valve element;
- the abutment portion is closer to a valve central axis than the weld penetration portion;
- and
- the rod part and the valve element include an unwelded portion between the abutment portion and the weld penetration portion.
A production process for a fuel injection valve including a movable element, wherein:
- the movable element includes:
- a movable core;
- a valve element;
- and
- a rod part connected between the movable core and the valve element and including a first end welded to the valve element;
- and
- the production process comprises welding the valve element to the first end of the rod part by:
- causing a rod part side facing surface to abut a valve element side facing surface at a radially intermediate place, wherein the rod part side facing surface is a surface of the rod part facing the valve element, and the valve element side facing surface is a surface of the valve element facing the rod part;
- and
- producing a weld penetration portion radially outside of an abutment portion at which the rod part side facing surface abuts the valve element side facing surface, for welding of the rod part and the valve element, while providing an unwelded portion between the abutment portion and the weld penetration portion.
Dependencies are inferred from the claim text.