Electromagnetic injection valve and method for assembling an electromagnetic injection valve

• US 10,641,221 B2
• Filed: 10/10/2016
• Issued: 05/05/2020
• Est. Priority Date: 10/12/2015
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (Continental AG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Filippi, Stefano Carmela, Grandi, Mauro, Lenzi, Francesco, Polidori, Valerio
• Primary Examiner(s): Dallo, Joseph J
• Application Number:
  US15/767,431
• Publication Number:
  US 20180291849A1
• Time in Patent Office: 1,303 Days
• CPC Class Codes: F02M 2200/08 Fuel-injection apparatus having special means for influencing magnetic flux, e.g. for shielding or guiding magnetic flux
• CPC Class Codes: F02M 2200/8061 involving press-fit, i.e. interference or friction fit
• CPC Class Codes: F02M 2200/9061 Special treatments for modifying the properties of metals used for fuel injection apparatus, e.g. modifying mechanical or electromagnetic properties
• CPC Class Codes: F02M 51/0614 characterised by arrangement of electromagnets or fixed armature
• CPC Class Codes: F02M 51/0653 the valve being an elongated body, e.g. a needle valve
• CPC Class Codes: F02M 61/166 Selection of particular materials
• CPC Class Codes: F02M 61/168 Assembling; Disassembling; Manufacturing; Adjusting
• CPC Class Codes: F02M 63/0019 characterised by the arrangement of electromagnets or fixed armatures
• CPC Class Codes: H01F 2007/1676 Means for avoiding or reducing eddy currents in the magnetic circuit, e.g. radial slots

Abstract

The present disclosure relates to internal combustion engines. Various embodiments may include an electromagnetic injection valve, particularly a solenoid type fluid injection valve for automotive applications. For example, an electromagnetic injection valve may include: an inlet tube; a valve body having a longitudinal axis and a cavity in which a valve needle moves; an upper magnetic ring press-fitted with the inlet tube or the valve body; a lower magnetic ring press-fitted with the valve body; and a housing part surrounding an electromagnetic actuator unit for moving the valve needle. The lower magnetic ring is positioned on the valve body in such a way that an upper side of the lower magnetic ring is in close contact with an underside of the housing part. The electromagnetic actuator unit abuts the upper magnetic ring and the lower magnetic ring on opposite axial sides. The housing part and/or the lower magnetic ring comprises a cut extending along the axis.

Claims

1. An electromagnetic injection valve comprising:

an inlet tube;

a valve body having a longitudinal axis and a cavity in which a valve needle is axially moveable;

an upper magnetic ring press-fitted with the inlet tube or the valve body;

a lower magnetic ring press-fitted with the valve body; and

a housing part surrounding an electromagnetic actuator unit for moving the valve needle;

wherein the lower magnetic ring is positioned on the valve body in such a way that an upper side of the lower magnetic ring is in close contact with an underside of the housing part;

the electromagnetic actuator unit abuts the upper magnetic ring and the lower magnetic ring on opposite axial sides; and

at least one of the housing part and the lower magnetic ring comprises a cut extending along the axis.

2. An electromagnetic injection valve according to claim 1, wherein the upper magnetic ring is press-fit onto an external circumferential surface of the inlet tube or an external circumferential surface of the valve body.

3. An electromagnetic injection valve according to claim 1, wherein the housing part is positioned axially between the upper magnetic ring and the lower magnetic ring.

4. An electromagnetic injection valve according to claim 1, wherein the housing part comprises a magnetic material.

5. An electromagnetic injection valve according to claim 1, wherein the housing part comprises a hollow cylinder and the lower magnetic ring is separate from the housing part.

6. An electromagnetic injection valve according to claim 1, wherein the cut extends entirely through the housing part or the lower magnetic ring in a radial direction.

7. An electromagnetic injection valve according to claim 1, wherein the cut extends only partially through the housing part and/or the lower magnetic ring in a radial direction.

12. An electromagnetic injection valve according to claim 1, wherein the lower magnetic ring is press-fit onto an external circumferential surface of the valve body.

8. A method for assembling an electromagnetic injection valve comprising an inlet tube, a valve body comprising a cavity in which a valve needle is axially moveable, and an electromagnetic actuator unit for moving the valve needle, the method comprising:

press-fitting an upper magnetic ring onto the inlet tube or the valve body;

fitting a housing part surrounding the actuator unit;

overmolding the housing part; and

press-fitting a lower magnetic ring separately with the valve body in such a way that an upper side of the lower magnetic ring is in close contact with an underside of the housing part;

wherein the upper magnetic ring and the lower magnetic ring are disposed such that they abut opposite axial sides of the electromagnetic actuator unit to fix an axial position of the electromagnetic actuator unit.

9. A method according to claim 8, wherein the upper magnetic ring is press-fit onto an external circumferential surface of the inlet tube or an external circumferential surface of the valve body.

10. A method according to claim 8, wherein the upper magnetic ring is press-fit onto the valve body or the inlet tube in such a way that a lower side of the upper magnetic ring is in close contact with an upper side of the housing part, the upper side facing away from the lower magnetic ring.

11. A method according to claim 8, wherein at least one of the housing part and the lower magnetic ring comprises a cut extending in an axial direction.

13. A method according to claim 8, wherein the lower magnetic ring is press-fit onto an external circumferential surface of the valve body.