Valve assembly for an injection valve and injection valve

Patent metadata

Field	Value
Publication number	US-9376994-B2
Application number	US-201113876848-A
Country	US
Kind code	B2
Filing date	Sep 29, 2011
Priority date	Sep 30, 2010
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A valve assembly for an injection valve includes a valve body including 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 a further position, an upper retainer arranged in the cavity and fixed to the valve needle, and an electro-magnetic actuator unit configured to actuate the valve needle, the electro-magnetic actuator unit comprising an armature, arranged in the cavity and axially movable relative to the valve needle, the armature configured to be coupled to the upper retainer when the valve needle is actuated to leave the closing position, and a permanent magnet arranged in the cavity adjacent the position of the armature when the valve needle is in its closing position.

First claim

What is claimed is:

1. Valve assembly for an injection valve, comprising:
a valve body having a central longitudinal axis and 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 at least one further position,
an upper retainer arranged in the cavity and fixedly coupled to the valve needle,
an electro-magnetic actuator unit configured to actuate the valve needle, the electro-magnetic actuator unit comprising an armature, arranged in the cavity and axially movable relative to the valve needle, the armature configured to be coupled to the upper retainer to activate the valve needle to leave the closing position, and
a permanent magnet arranged in the cavity at a position adjacent to the position of the armature when the valve needle is in its closing position.

2. Valve assembly of claim 1 , wherein the permanent magnet is fixedly coupled to the valve body.

3. Valve assembly of claim 1 , wherein the permanent magnet is at least partially surrounded by a ring-like element fixedly coupled to the valve body.

4. Valve assembly of claim 3 , wherein the ring-like is formed from an elastic material.

5. Valve assembly of claim 4 , wherein the elastic material is a plastic or a metallic material.

6. Valve assembly of claim 3 , wherein the permanent magnet is formed from a plastic magnetic material.

7. Valve assembly of claim 3 , wherein the permanent magnet is overmoulded to the ring-like element.

8. Valve assembly of claim 3 , wherein the ring-like element comprises a side-cut in an axial and in a radial direction of the valve needle.

9. Valve assembly of claim 1 , wherein the valve body is formed from a magnetic material.

10. Valve assembly of claim 1 , wherein the valve body is formed from a non-magnetic material.

11. Valve assembly of claim 1 , wherein the cavity comprises a step.

12. Valve assembly of claim 11 , wherein a washer is arranged between the permanent magnet and the step.

13. Valve assembly of claim 11 , wherein a washer is arranged between the permanent magnet and the armature.

14. Valve assembly of claim 13 , wherein the washer is fixedly coupled to the valve needle.

15. An injection valve comprising:
a valve assembly comprising:
a valve body having a central longitudinal axis and 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 at least one further position,
an upper retainer arranged in the cavity and fixedly coupled to the valve needle,
an electro-magnetic actuator unit configured to actuate the valve needle, the electro-magnetic actuator unit comprising an armature, arranged in the cavity and axially movable relative to the valve needle, the armature configured to be coupled to the upper retainer to activate the valve needle to leave the closing position, and
a permanent magnet arranged in the cavity at a position adjacent to the position of the armature when the valve needle is in its closing position.

16. The injection valve of claim 15 , wherein the permanent magnet is fixedly coupled to the valve body.

17. The injection valve of claim 15 , wherein the permanent magnet is at least partially surrounded by a ring-like element fixedly coupled to the valve body.

18. The injection valve of claim 17 , wherein the permanent magnet is overmoulded to the ring-like element.

19. The injection valve of claim 17 , wherein the ring-like element comprises a side-cut in an axial and in a radial direction of the valve needle.

20. The injection valve of claim 15 , wherein the cavity comprises a step, and wherein a washer is arranged between the permanent magnet and the step.

Assignees

• Grandi Mauro
• Polidori Valerio
• Mannucci Cristiano
• Continental Automotive Gmbh

Inventors

• Grandi Mauro
• Polidori Valerio
• Mannucci Cristiano

Classifications

• F02M51/066 Primary

  the armature and the valve being allowed to move relatively to each other or not being attached to each other · CPC title

• F02M51/061 Primary

  using electromagnetic operating means · CPC title

• H01F7/1615

  Armatures or stationary parts of magnetic circuit having permanent magnet · CPC title

• F02M51/0689

  and permanent magnets (F02M51/0696 takes precedence) · CPC title

• F02M51/0653

  the valve being an elongated body, e.g. a needle valve · CPC title