Packing Mounting Structure Axial Deviation Suppression
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Solution Overview
Problem
Conventional packing mounting structures fail to effectively suppress axial deviation between a passage part and a packing, which compromises the waterproof performance.
Innovation Solution
A packing mounting structure that includes a casing with a passage part, a packing with a seal part and a protruding shaft, a cover with a hole part that holds the packing, and a fastening member, where the hole part has a narrow part and a holding hole part to allow the shaft to move relative to the cover, preventing axial displacement and improving waterproof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cover structure is used to hold the packing, then the structure is simple, but axial deviation between the passage part and packing cannot be suppressed
Solution Approach 1:
The hole part is divided into three functional segments: insertion hole part (for initial insertion), narrow part (for positioning and preventing excessive insertion), and holding hole part ( for final positioning). This segmentation allows each part to perform its specific function, achieving precise axial positioning of the packing without requiring complex external fixtures or adjustment mechanisms.
Solution Approach 2:
The narrow part acts as an intermediary element between the insertion hole part and the holding hole part. It provides a transition zone that guides the shaft part into the correct position, preventing both insufficient insertion and excessive insertion, thereby achieving precise axial positioning through this intermediate structural element.
2Reliability
If the packing is rigidly fixed to prevent axial displacement, then waterproof performance improves, but the structure becomes more complex and harder to assemble
Solution Approach 1:
The hole part is designed with a tapered narrow part that allows dynamic adjustment during assembly. The shaft part can freely move during insertion, then becomes positioned and constrained after passing through the narrow part into the holding hole part. This dynamic approach simplifies assembly compared to rigid pre-positioning, while still achieving reliable waterproof sealing.
Solution Approach 2:
The narrow part is pre-configured with a specific taper angle and dimensions that automatically guide the shaft part into the correct axial position during insertion. This preliminary structural configuration eliminates the need for complex adjustment mechanisms or precision alignment procedures during assembly, making the manufacturing process easier while ensuring reliable waterproof performance.
Data Source
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AI summary
A packing mounting structure (100) includes a casing (20) having a passage part (23) on a wall part facing a power detection terminal; packing (7) including a seal part (80) and an portion to be held (70); and a cover (6) installed on the casing in a state in which the portion to be held is held by a hole part (65), and closing the passage part by the packing. The portion to be held includes a shaft part and a first flange part (72). The hole part includes a narrow part (68); an insertion hole part (66) through which the first flange part is capable of passing; and a holding hole part (67) configured to hold the shaft part in a state in which a gap is formed between the holding hole part and the shaft part.