Patent ID: 9651011
Date: 2017-05-16
CPC Classifications: F02M

Claim:
1. A valve assembly for an injection valve, comprising: a valve body and comprising a cavity with a fluid inlet portion and a fluid outlet portion, a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions, an electro-magnetic actuator unit configured to actuate the valve needle, the electro-magnetic actuator unit comprising a cylindrical armature axially movable in the cavity, and a disc element arranged in the cavity and being fixedly coupled to the valve needle, the disc element comprising an L-shaped cross-section having an axially extending leg and a radially extending leg facing the cylindrical armature, the disc element extending radially to limit axial displacement of the cylindrical armature relative to the valve needle in an axial direction towards the fluid outlet portion, the cylindrical armature having a primary radius greater than a radius of the radially extending leg of the disc element and a stepdown to a secondary radius equal to the radius of the radially extending leg of the disc element, and an armature spring that biases the armature away from the disc element to thereby establish a fluid-filled gap between the armature and the radially extending leg of the disc element, wherein the armature is axially displaceable relative to the valve needle towards the disc element against the bias provided by the armature spring to reduce an axial size of the gap until the armature and the disc element are in direct contact.