Ignition Coil Joint with Communicating Void for Spark Plug Installation
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Solution Overview
Problem
Existing ignition coils for internal combustion engines face difficulties in the ease of installation and removal of spark plugs due to negative pressure within the joint, which increases the force required for these operations, especially in curved or longer plug holes.
Innovation Solution
The design incorporates a communicating void between the high-voltage tower and the joint, allowing air pressure to remain consistent during spark plug attachment and detachment, reducing the force needed for installation and removal by facilitating air exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the joint is made of soft material to cover the high-voltage tower, then the joint can be securely fitted, but negative pressure increases during spark plug removal making it harder to extract
Solution Approach 1:
The joint is divided into two functional parts: an elastic sealing portion that maintains secure fitting and a rigid skeleton portion that provides structural stability. This segmentation allows the sealing portion to maintain negative pressure for security while the skeleton prevents excessive diameter reduction that would hinder spark plug removal.
Solution Approach 2:
The joint uses a composite structure combining elastic material (for sealing) with a rigid skeleton (for structural support). This composite design enables the joint to simultaneously achieve secure fitting through elastic deformation and ease of operation through skeletal rigidity that limits diameter changes.
2Adaptability or versatility
If the joint is made longer or curved to accommodate longer or curved plug holes, then adaptability increases, but the force required to install and remove spark plugs increases
Solution Approach 1:
By separating the joint into elastic sealing portion and rigid skeleton portion, the design allows the overall joint to be made longer or curved for adaptability while the rigid skeleton maintains structural integrity and limits resistance to spark plug operations.
Solution Approach 2:
The composite structure of elastic material combined with rigid skeleton enables the joint to achieve complex shapes for better adaptability while the skeleton provides structural support that prevents excessive force requirements during spark plug installation and removal.
3Ease of operation
If recesses are formed in the joint to facilitate spark plug installation, then ease of operation improves, but the contact area between joint and spark plug decreases
Solution Approach 1:
The joint structure separates the sealing function (elastic portion) from the structural function (skeleton), allowing recesses to be added for ease of operation without compromising the sealing contact area, as the elastic portion can deform to maintain contact.
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 installation and removal of spark plugs by maintaining equal air pressure within the joint, reducing the load on the user and shortening the time required for disassembly, while also providing improved air permeability and insulation.
Implementation Method 1
A communicating void is formed between the high-voltage tower and the joint to communicate between an inner space formed inside the high-voltage tower and the joint and an outer space located outside the high-voltage tower and the joint. This facilitates attachment or removal of the joint to or from the spark plug by minimizing pressure differential forces.
Data Source
AI summary
An ignition coil for an internal combustion engine includes a primary coil, a secondary coil, a case, and a joint. The primary and secondary coils are magnetically coupled with each other. The case includes a case body in which the primary and secondary coils are disposed and a cylindrical high-voltage tower which protrudes from a case bottom wall of the case body. The joint is fit on the high-voltage tower and a spark plug. The joint is of a cylindrical shape. A communicating void is formed between the high-voltage tower and the joint to communicate between an inner space of the high-voltage tower and the joint and an outer space disposed outside the high-voltage tower and the joint, thereby facilitating attachment or removal of the joint to or from the spark plug.