# US 10,309,360 B2 · Valve assembly for an injection valve and injection valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,360 B2 - Document ID: US10309360B2 - Status: Granted - Kind: B2 - Application number: 15/630,403 - Filed: 2017-06-22 - Published: 2017-12-28 - Granted: 2019-06-04 - Earliest claimed: 2016-06-24 - Assignees: CPT Group GmbH - Applicants: Continental Automotive GmbH - Inventors: Filippo Falaschi; Christoph Hamann; Luigi Marchi - Web page: https://patentgrep.com/patent/US10309360B2 ## CPC - F02M 61/20: Closing valves mechanically, e.g. arrangements of springs or weights {or permanent magnets; Damping of valve lift} - F02M 51/0625: {characterised by arrangement of mobile armatures} - F02M 51/066: {the armature and the valve being allowed to move relatively to each other or not being attached to each other} - F02M 2200/50: Arrangements of springs for valves used in fuel injectors or fuel injection pumps - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF ## Abstract A valve assembly for an injection valve is disclosed, including a valve body with a cavity, a valve needle axially moveable in the cavity, the valve needle being fixedly connected to a retaining element which extends in radial direction and is arranged in an axial region of the valve needle facing away from the fluid outlet portion, and an armature being able to slide on the valve needle and acting on the needle by way of the retaining element. A conical spring is arranged between the retaining element and a top side of the armature facing the retaining element, biasing the armature away from the retaining element. ## Claims ### Claim 1 A valve assembly for an injection valve, comprising: a valve body with a central longitudinal axis comprising a cavity with a fluid inlet portion and a fluid outlet portion, a retaining element, a valve needle axially moveable 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, the valve needle being fixedly connected to the retaining element which extends in a radial direction and is arranged in an axial region of the valve needle facing away from the fluid outlet portion, an armature for an electromagnetic actuator unit axially movable in the cavity, the armature comprising a central axial opening through which the valve needle extends, the armature being able to slide on the valve needle and acting on the needle by way of the retaining element, and a conical spring arranged around the central longitudinal axis between the retaining element and a top side of the armature facing the retaining element, biasing the armature away from the retaining element. ### Claim 2 (depends on 1) The valve assembly according to claim 1, wherein the armature has a flat surface which is operable to engage in form fit connection with the retaining element and which represents a seat for the conical spring. ### Claim 3 (depends on 1) The valve assembly according to claim 1, wherein the retaining element comprises a sleeve portion which axially overlaps the conical spring and a collar portion projecting in a radially outward direction beyond the sleeve portion and representing a seat for the conical spring. ### Claim 4 (depends on 1) The valve assembly according to claim 1, wherein the conical spring includes a plurality of spring wire windings, a diameter of the windings of the conical spring increases at least by 2d per turn, wherein d is the diameter of the spring wire. ### Claim 5 (depends on 1) The valve assembly according to claim 1, wherein the conical spring includes a plurality of windings, the diameter of the windings of the conical spring is minimal at a first end of the spring facing the retaining element and maximal at a second end facing the armature and increases in the direction towards the armature. ### Claim 6 (depends on 1) The valve assembly according to claim 1, wherein the armature comprises a number of through holes forming fluid passages between the fluid inlet portion and the fluid outlet portion, wherein first ends of the through holes are disposed on the top side of the armature radially outside of an area covered by the conical spring. ### Claim 7 (depends on 1) The valve assembly according to claim 1, wherein the valve assembly is part of and is disposed in an injection valve, the injection valve further comprising an electromagnetic actuator unit operatively coupled to the valve assembly, the electromagnetic actuator unit including the armature. ### Claim 8 An injection valve, comprising: an electromagnetic actuator unit including an armature; and a valve assembly operably coupled to the actuator unit, comprising: a valve body with a central longitudinal axis comprising a cavity with a fluid inlet portion and a fluid outlet portion, a retaining element disposed in the cavity, a valve needle axially moveable 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, the valve needle being fixedly connected to the retaining element which extends in a radial direction and is arranged in an axial region of the valve needle facing away from the fluid outlet portion, and a conical spring arranged around the central longitudinal axis between the retaining element and a top side of the armature facing the retaining element, biasing the armature away from the retaining element, wherein the armature of the electromagnetic actuator unit is axially movable in the cavity, the armature comprising a central axial opening through which the valve needle extends, the armature being able to slide on the valve needle and acting on the needle by way of the retaining element. ### Claim 9 (depends on 8) The injection valve of claim 8, wherein the armature has a flat surface which is operable to engage in form fit connection with the retaining element and which represents a seat for the conical spring. ### Claim 10 (depends on 8) The injection valve of claim 8, wherein the retaining element comprises a sleeve portion which axially overlaps the conical spring and a collar portion projecting in a radially outward direction beyond the sleeve portion and representing a seat for the conical spring. ### Claim 11 (depends on 8) The injection valve of claim 8, wherein the conical spring includes a plurality of spring wire windings, a diameter of the windings of the conical spring increases at least by 2d per turn, where d is the diameter of the spring wire. ### Claim 12 (depends on 8) The injection valve of claim 8, wherein the conical spring includes a plurality of windings, the diameter of the windings of the conical spring is at a smallest diameter at a first end of the spring facing the retaining element and at a largest diameter at a second end facing the armature and increases in the direction towards the armature. ### Claim 13 (depends on 8) The injection valve of claim 8, wherein the armature comprises a number of through holes forming fluid passages between the fluid inlet portion and the fluid outlet portion, wherein first ends of the through holes are located on the top side of the armature radially outside an area covered by the conical spring.