Igniter Collar Support Structure for Resin Crack Resistance
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Solution Overview
Problem
The igniter assembly's pressure resistance performance is compromised when the resin-integrated igniter collar and body experience cracks due to impacts, leading to potential disintegration and loss of resin components.
Innovation Solution
Incorporating a first support portion and a second support portion on the igniter collar's peripheral wall, both buried in the resin, to prevent resin fallout by distributing stress and maintaining assembly integrity even if cracks occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the igniter collar and igniter body are integrated by resin, then the assembly is simplified and widely used, but when a force acts on the resin portion it may produce cracks and cause part of the resin to fall out
Solution Approach 1:
The igniter collar is divided into multiple segments including a peripheral wall portion, a first support portion, and a second support portion. These segmented structures are embedded in the resin molded article to provide distributed support, preventing crack propagation and resin fallout while maintaining the integrated assembly design
Solution Approach 2:
The invention combines metal igniter collar components with resin molded article to create a composite structure. The metal support portions provide structural strength and crack resistance, while the resin provides integration and sealing, achieving both simplicity and reliability
2Weight of moving object
If the resin molded article is made thin to reduce weight, then the igniter assembly becomes lighter, but the resin portion becomes more susceptible to cracking under impact
Solution Approach 1:
The first support portion and second support portion are pre-positioned within the resin molded article at strategic locations where cracks are most likely to form. These support portions act as reinforcement elements that prevent crack propagation before they can cause resin fallout, allowing the use of thinner resin without compromising strength
Data Source
AI summary
A technique of improving pressure resistance performance of an igniter assembly is provided. The igniter assembly includes an igniter body including an ignition portion filled with an igniting charge and an electro-conductive portion extending from the ignition portion, an igniter collar including a tubular peripheral wall portion that surrounds at least the electro-conductive portion of the igniter body, and a resin molded article that is interposed between the igniter body and the igniter collar and integrates the igniter body and the igniter collar. The igniter collar includes a first support portion that is provided in an inner peripheral portion of the peripheral wall portion and is formed in a convex shape toward an inner side of the peripheral wall portion in a radial direction and thus buried in the resin molded article and a second support portion that is provided at a position in the inner peripheral portion proximal to the first support portion from the ignition portion in a direction along a center axis of the peripheral wall portion and is formed in a convex shape toward the inner side of the peripheral wall portion in the radial direction and thus buried in the resin molded article or formed in a concave shape toward an outer side of the peripheral wall portion in the radial direction and thus filled with the resin molded article.