Spring Fixing Member Boss Step for Coil Spring Inspection
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Solution Overview
Problem
Existing spring fixing members for coil springs have difficulty ensuring secure fixation and visual inspection due to insufficient mounting, leading to potential disconnection under vibrations and challenging visual verification, especially when additional components are present.
Innovation Solution
A spring fixing member with a boss and protrusions arranged to ensure the coil spring is securely engaged between the arrangement surface and protrusions, featuring a first region with a larger diameter and a second region with a smaller diameter, and a step between, allowing for easy visual inspection by checking the positional relationship between the coil spring and boss axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protrusion intervenes between the first turn and second turn of the coil spring to prevent disconnection, then the reliability of fixation is improved, but the ease of visual inspection deteriorates when other members are arranged around the spring fixing member
Solution Approach 1:
The patent introduces a groove as an intermediary visual indicator that mediates between the protrusion (which ensures fixation reliability) and the inspection requirement. The groove is formed on the boss surface and allows visual confirmation of proper coil spring mounting without requiring direct observation of the protrusion engagement, thus resolving the contradiction between reliable fixation and ease of inspection
Solution Approach 2:
The groove serves as a visual copy or representation of the engagement state. Instead of requiring direct observation of the complex protrusion-coil spring interaction, the groove provides a simplified visual copy that indicates whether the coil spring is properly mounted, making inspection easier while maintaining fixation reliability
2Stability of the object's composition
If the boss diameter is substantially identical to the coil spring inner diameter to prevent inclination, then the stability of positioning is improved, but the ability to discriminate mounting state through inspection deteriorates
Solution Approach 1:
The groove acts as an intermediary indicator that translates the internal engagement state (which is difficult to observe due to the tight fit between boss and coil spring) into an externally visible feature. This allows inspectors to determine mounting state without needing to observe the direct contact between the boss surface and coil spring, resolving the detection difficulty while maintaining positioning stability
Data Source
AI summary
A coil spring fixing member includes: a mount member having an arrangement surface on which an end portion of the coil spring is disposed; a boss provided on the arrangement surface, on which boss the coil spring is fitted; and a protrusion provided at a site on a side surface of the boss, the site being apart from the arrangement surface by at least a wire diameter of the coil spring, wherein the protrusion is engaged with winding of the coil spring disposed between the arrangement surface and the protrusion, and a portion of the boss ranging includes a first region having a first diameter, and a second region which is nearer to the end portion than the first region and has a diameter smaller than the first diameter, and a step intervenes between the first region and the second region.