Ignition coil

• US 7,170,380 B2
• Filed: 02/09/2005
• Issued: 01/30/2007
• Est. Priority Date: 02/19/2004
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fischer, Bernd, Lindenthal, Konstantin, Skowronek, Tim, Weimert, Markus
• Primary Examiner(s): BAISA, JOSELITO SASIS
• Application Number:
  US11/055,437
• Publication Number:
  US 20050184846A1
• Time in Patent Office: 720 Days
• Field of Search: 336/90
• US Class Current: 336/90
• CPC Class Codes: H01F 27/288 Shielding
• CPC Class Codes: H01F 27/323 Insulation between winding turns, between winding layers
• CPC Class Codes: H01F 27/327 Encapsulating or impregnating encapsulating coil and core H01F27/022
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• CPC Class Codes: H01F 38/12 Ignition, e.g. for IC engines

Abstract

An ignition coil for an internal combustion engine, including a magnetically active core, a first coil shell which is used as a support for a first coil winding made of an electrically conductive wire, and a second coil shell which is positioned so as to be concentric to the first coil shell and is used as a support for a second coil winding made of an electrically conductive wire. Situated between the first coil winding and the second coil winding is a shielding layer, which is made of an electrically conductive material and provided with a grounding contact.

Claims

1. An ignition coil for an internal combustion engine, comprising:

a magnetically active core;

a first coil winding composed of an electrically conductive wire;

a first coil shell acting as a support for the first coil winding;

a second coil winding composed of an electrically conductive wire;

a second coil shell situated concentric to the first coil shell and acting as a support for the second coil winding; and

a shielding layer being composed of an electrically conductive material, having a grounding contact, and being situated between the first coil winding and the second coil winding;

wherein the shielding layer is formed by a coating of the second coil shell.

2. An ignition coil for an internal combustion engine, comprising:

a magnetically active core;

a first coil winding composed of an electrically conductive wire;

a first coil shell acting as a support for the first coil winding;

a second coil winding composed of an electrically conductive wire;

a second coil shell situated concentric to the first coil shell and acting as a support for the second coil winding; and

a shielding layer being composed of an electrically conductive material, having a grounding contact, and being situated between the first coil winding and the second coil winding;

wherein the shielding layer is formed by the second coil shell, and the second coil shell is composed of an electrically conductive plastic.