Coil Spring Support Groove Layout for Lower-End Adhesive Strength
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Solution Overview
Problem
Conventional coil spring devices face challenges in reducing costs while maintaining adequate adhesive strength between the lower end of the main body spring and the inner surface of the support groove.
Innovation Solution
The coil spring device incorporates a support groove with spacer protrusions that occupy a larger volume at the center portion of the gap in the circumferential direction, reducing the adhesive layer volume at low load areas and increasing it at high load areas, ensuring strength at the end portions while minimizing adhesive usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform adhesive layer is applied around the entire support groove, then the adhesive strength is distributed evenly, but the adhesive cost increases and the adhesive layer at low-load areas becomes excessive
Solution Approach 1:
The patent applies local quality by creating non-uniform spacer protrusions that concentrate adhesive in specific high-load areas (end portions in circumferential direction) while reducing adhesive in low-load areas (center portion). This is achieved by making the spacer protrusions have different volumes at different locations, with the center portion having a larger volume to push back adhesive, thereby optimizing adhesive distribution according to local load requirements
Solution Approach 2:
The support groove's inner surface is segmented into multiple regions with different spacer protrusions. These protrusions divide the adhesive application area into zones with different adhesive volumes, allowing independent optimization of each zone based on its specific load characteristics, thus reducing overall adhesive usage while maintaining necessary strength
2Reliability
If the support groove extends 360° around the coil axis, then the support coverage is maximized, but the adhesive amount and cost increase
Solution Approach 1:
The patent reduces the support groove's circumferential extension from 360° to a specific angle range (180°-360°), applying local quality by concentrating support and adhesive only where needed. The non-uniform spacer protrusions further optimize this by placing more adhesive at critical end portions and less at the center, achieving adequate support coverage with reduced adhesive quantity
Data Source
AI summary
A coil spring includes a main body spring and an insulator, the insulator is provided with a support groove which extends around a coil axis and into which a lower end portion of the main body spring is fitted, a lower end portion of the main body spring adheres to an inner surface of the support groove, the inner surface of the support groove is provided with a plurality of spacer protrusions which support an outer peripheral surface of a wire rod, the support groove extends in an angle range of 180° or more and 360° or less around the coil axis, and a ratio of a volume of the spacer protrusions occupying a gap between the inner surface of the support groove and the outer peripheral surface of the wire rod at a center portion in the gap in a circumferential direction around the coil axis is larger than that at the other portions in the gap in the circumferential direction.