Vibration-Isolated Ignition Coil Housing Using Elastomeric Boot
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Solution Overview
Problem
Electrical components in engine ignition coil assemblies are sensitive to engine vibrations, leading to potential damage and instability.
Innovation Solution
The engine ignition coil assembly incorporates an elastomeric boot and isolator to isolate the ignition coil housing from engine vibrations, using a single fastener to secure the housing while allowing for relative movement, thus reducing vibration transmission and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the ignition coil housing is rigidly mounted to the engine block assembly, then structural stability is improved, but vibration transmission to electrical components increases
Solution Approach 1:
An elastomeric isolator is introduced as an intermediary component between the ignition coil housing and the engine block assembly. This elastomeric material serves as a mediator that mechanically connects the housing to the engine block while simultaneously isolating electrical components from vibration transmission through its damping properties.
Solution Approach 2:
The elastomeric isolator functions as a flexible element that replaces rigid mounting structures. This flexible component allows the ignition coil housing to maintain structural stability while accommodating vibrations through elastic deformation, thereby protecting sensitive electrical components from harmful vibration transmission.
2Stability of the object's composition
If multiple fasteners are used to secure the ignition coil housing, then mounting stability is improved, but component count and mass increase
Solution Approach 1:
Multiple fastening functions are merged into a single fastener that passes through the elastomeric isolator. This consolidated fastening approach maintains mounting stability by securing the housing at multiple points through one fastener while reducing the total component count and associated mass.
Solution Approach 2:
The single fastener performs multiple functions: it secures the ignition coil housing to the engine block assembly, compresses the elastomeric isolator to provide vibration isolation, and maintains proper positioning. This multi-functional fastener reduces component count while preserving mounting stability.
3Stability of the object's composition
If multiple fasteners are used to secure the ignition coil housing, then mounting stability is improved, but mass increases
Solution Approach 1:
Multiple fastening functions are merged into a single fastener that passes through the elastomeric isolator. This consolidated fastening approach maintains mounting stability by securing the housing at multiple points through one fastener while reducing the total component count and associated mass.
Solution Approach 2:
The single fastener performs multiple functions: it secures the ignition coil housing to the engine block assembly, compresses the elastomeric isolator to provide vibration isolation, and maintains proper positioning. This multi-functional fastener reduces component count while preserving mounting stability.
4Strength
If the fastener is fixed rigidly to the ignition coil housing, then connection strength is improved, but vibration-induced stress increases
Solution Approach 1:
The elastomeric isolator serves as an intermediary between the fastener and the ignition coil housing. This intermediary layer allows the fastener to maintain a strong connection to the engine block assembly while isolating the housing from vibration-induced stresses through the isolator's damping characteristics.
Solution Approach 2:
The elastomeric isolator acts as a flexible element that replaces rigid fastening interfaces. This flexible component allows the connection to maintain strength through elastic deformation while accommodating vibrations and reducing stress transmission to the ignition coil housing.
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
The solution effectively dampens engine vibrations, preventing excessive movement of electrical components and reducing the risk of damage, while conforming to packaging space limitations and minimizing mass.
Implementation Method 1
The elastomeric boot and the elastomeric isolator may be sufficiently resiliently deformable to dampen engine vibrations and prevent excessive vibration of the electrical connector and ignition coil apparatus
Implementation Method 2
An elastomeric boot supports the ignition coil housing... An elastomeric isolator is disposed on the ignition coil housing at the fastener opening around the single fastener
Data Source
AI summary
An engine ignition coil assembly disclosed herein provides an ignition coil housing that may be mounted on an engine block assembly and that is isolated from engine vibrations. The engine ignition coil assembly comprises an ignition coil housing. The ignition coil housing contains an ignition coil apparatus. An electrical connector for the ignition coil apparatus is mounted to the ignition coil housing. An elastomeric boot supports the ignition coil housing and may be disposed on an engine block assembly such that ignition coil housing is spaced apart from the engine block assembly by the elastomeric boot. A single fastener extends through a fastener opening in the ignition coil housing parallel with the elastomeric boot. An elastomeric isolator is disposed on the ignition coil housing at the fastener opening around the single fastener. A proximal end of the single fastener may be fixed to the engine block assembly.