Corona ignition device

Patent metadata

Field	Value
Publication number	US-9366221-B2
Application number	US-201414167641-A
Country	US
Kind code	B2
Filing date	Jan 29, 2014
Priority date	Feb 1, 2013
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

The invention relates to a corona ignition device for igniting fuel in a combustion chamber of an engine by means of a corona discharge, said corona ignition device comprising an insulator, a center electrode, which is held in the insulator, a housing, in which the insulator is held, and coil turns, which are disposed in a cylindrical main part of the housing and are connected to the center electrode. According to an aspect of this disclosure, the housing widens on the side of the main part remote from the insulator and further coil turns are disposed there, in a wider housing part.

First claim

What is claimed is:

1. A corona ignition device for igniting fuel in a combustion chamber of an engine by means of a corona discharge, said corona ignition device comprising:
an insulator;
a center electrode held in the insulator;
a housing in which the insulator is held; and
coil turns, which are disposed in a cylindrical main part of the housing and are connected to the center electrode;
wherein the housing widens on the side of the main part remote from the insulator to form a wider housing part, further coil turns being disposed in the wider housing part, wherein the further coil turns have a greater diameter than the coil turns in the main part and the coil turns and further coil turns are connected in series.

2. The corona ignition device according to claim 1 , wherein the further coil turns are wound onto a first coil form, which is plugged onto a second coil form onto which the coil turns in the main part are wound.

3. The corona ignition device according to claim 1 , wherein the number of coil turns in the wider housing part is between one-fourth and two-thirds the total number of coil turns.

4. The corona ignition device according to claim 1 , wherein the coil turns in the main part and in the wider housing part are wound with wire having a diameter of 0.3 mm to 0.6 mm.

5. The corona ignition device according to claim 1 , wherein most of the coil turns in the main part have an outer diameter that is between 0.55 and 0.57 times the inner diameter of the main part.

6. The corona ignition device according to claim 1 , wherein in the wider housing part, the ratio between the outer diameter of the turns and the inner diameter of the wider housing part is between 0.55 and 0.57.

7. The corona ignition device according to claim 1 , wherein in the main part, the diameter of the turns decreases toward the insulator.

8. The corona ignition device according to claim 1 , wherein the coil turns in the main part and the coil turns in the wider housing part form two coils, which are connected by a plug-in or screw-type contact.

9. The corona ignition device according to claim 8 , wherein the plug-in or screw-type contact is enclosed by a shield sleeve.

10. A corona ignition device for igniting fuel in a combustion chamber of an engine by means of a corona discharge, said corona ignition device comprising:
an insulator;
a center electrode held in the insulator; and
an elongated housing in which the insulator is arranged;
said housing having a first portion in which a first coil is arranged and a second portion in which a second coil is arranged that is connected in series with the first coil;
wherein, the first portion has a larger length than the second portion, the second portion is wider than the first portion, and the second coil comprises coil turns that have a larger diameter than all coil turns of the first coil.

Assignees

• Borgwarner Beru Systems Gmbh
• Borgwarner Ludwigsburg Gmbh

Inventors

• Stifel Timo
• Ehrhardt Andreas

Classifications

• F02P3/02

  having inductive energy storage, e.g. arrangements of induction coils {(ignition coils structurally combined with sparking plugs F02P13/00; constructional details of ignition coils H01F38/12)} · CPC title

• H01T13/54

  having electrodes arranged in a partly-enclosed ignition chamber · CPC title

• H01T13/44

  with transformers, e.g. for high-frequency ignition · CPC title

• F02P7/026

  Distributors combined with other ignition devices, e.g. coils, fuel-injectors · CPC title

• F02P23/04 Primary

  Other physical ignition means, e.g. using laser rays · CPC title