Injection valve and method of making orifice
AssigneeHitachi, Ltd.
InventorsKenichi Gunji, Keiji Kawahara, Shuichi Shimizu, Atsushi Sekine, Masafumi Nakano
Life of this patent
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Abstract
An injection valve has a nozzle body, a valve needle positioned in the nozzle body, an actuator for actuating the valve needle, and an orifice plate fixed at an end of the nozzle body. The orifice plate has a valve seat for cooperating with the valve needle and an orifice for injecting a fluid. The orifice plate is provided with a projection having a convex-curved surface on an orifice outlet side of the orifice plate. A flat surface portion is formed in the area of the convex-curved surface, and the outlet of the orifice is located in the flat surface portion.
Claims10
A method of making an orifice of an injection valve for injecting a fluid, the orifice being slanted with respect to an axis of the injection valve, comprising:
- a first press working process step of forming a flat surface portion by press working in an area of a convex-curved surface portion, which is formed on a blank to be worked, and
- a second press working process step of making the orifice at the flat surface portion after the first press working process step so that an axis of the orifice has an approximately right angle to the flat surface portion and an outlet of the orifice is formed, in an area of the flat surface portion, by press working the blank with a punch from the flat surface toward a side opposite to the convex-curved surface portion.
Dependencies are inferred from the claim text.