Ignition Coil Winding Layout for Easier Coil-End Attachment
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Solution Overview
Problem
Existing ignition coils for internal combustion engines face difficulties in attaching the ends of the primary main coil and primary sub coil to the connection part of the primary bobbin, making it challenging to wind and fix the secondly-wound coil around the bobbin.
Innovation Solution
The ignition coil design includes a primary bobbin with a winding cylinder part and a connection part, where the primary main coil and primary sub coil are separately wound, with the firstly-wound ends having a shorter distance to the central axis than the secondly-wound ends, allowing for careful positioning and attachment to facilitate the winding and fixing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the primary main coil and primary sub coil are separately wound around the winding cylinder part, then the assembly efficiency is improved, but the attachment of coil ends to the connection part becomes difficult
Solution Approach 1:
The primary coil is divided into two separately wound coils (primary main coil and primary sub coil) that are wound in different directions. This segmentation allows each coil to be independently positioned and attached to the connection part, simplifying the attachment process while maintaining assembly efficiency
Solution Approach 2:
The two primary coils are designed with asymmetric winding directions (one clockwise, one counter-clockwise when viewed from the tower part side). This asymmetry creates distinct spatial arrangements of the coil ends, making it easier to distinguish and attach them to the connection part without interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the attachment of both coil ends to the connection part, preventing interference and ensuring proper handling and attachment, thereby improving the assembly efficiency of the ignition coil.
Implementation Method 1
an ignition coil for an internal combustion engine is provided... a primary coil including a primary main coil and a primary sub coil separately wound around the winding cylinder part; and a secondary coil that is concentric with the primary coil
Data Source
AI summary
An ignition coil for an internal combustion engine includes a primary bobbin including a winding cylinder part and a connection part between the winding cylinder part and a connector part, a primary coil including a primary main coil and a primary sub coil, and a secondary coil. When one of the primary main coil and the primary sub coil that includes an innermost coil part around the winding cylinder part is defined as a firstly-wound coil and the other is defined as a secondly-wound coil, firstly-wound ends, which are ends of the firstly-wound coil, and secondly-wound ends, which are ends of the secondly-wound coil, are attached to the connection part, and a shortest distance from a central axis of the winding cylinder part to each of the firstly-wound ends is smaller than a shortest distance from the central axis of the winding cylinder part to each of the secondly-wound ends.