# US 5,343,614 A · Method for manufacturing coils

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- Number: US 5,343,614 A
- Document ID: US5343614A
- Status: Granted
- Kind: A
- Application number: 07/920,301
- Filed: 1992-08-10
- Granted: 1994-09-06
- Earliest claimed: 1990-12-19
- Assignees: Robert Bosch GmbH
- Inventors: Dieter Betz; Karl-Heinz Nuebel; Jose Luis Almendro; Fernando Garcia; Eduardo Ramirez
- Web page: https://patentgrep.com/patent/US5343614A

## CPC

- H01F 41/02: for manufacturing cores, coils, or magnets (H01F41/14 takes precedence; for dynamo-electric machines H02K15/00)
- Y10T 29/49071: by winding or coiling
- Y10T 29/49073: by assembling coil and core
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A coil is produced by wrapping a primary winding of the coil onto a core rod of a wrapping machine, arranging a secondary winding of the coil on a winding form and pushing it coaxially over the primary winding, pulling the core rod out of the primary winding, simultaneously inserting an iron core into the primary winding, and moving along a housing which accommodates the iron core onto the ignition coil, and filling the housing with casting resin to form a plastic block which surrounds at least the primary winding.

## Claims

### Claim 1

A method of manufacturing a coil having a housing accommodating an encapsulated electrically insulated iron core, primary and secondary windings arranged in the housing, and a plastic block enclosing at least the primary winding, the method comprising the steps of wrapping a primary winding onto a core rod of a wrapping machine; arranging a secondary winding on a winding form; pushing the secondary winding on the winding form coaxially over the primary winding; pushing the secondary winding with the primary winding onto the encapsulated iron core so that the core rod is withdrawn out of the primary winding and the encapsulated iron core is arranged coaxially with respect to the core rod directly in the primary winding without intermediate elements while the housing connected with the encapsulated iron core encloses the primary winding and the secondary winding; and filling the housing with casting resin to form the plastic block.