Proximity Sensor Ring Sealing Assembly Workability
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Solution Overview
Problem
Conventional proximity sensors face challenges in assembly workability due to the need for precise positioning of the coil bobbin with respect to the housing, which is complicated by the use of liquid curable sealing materials that require solidification in a predetermined position, leading to poor assembly efficiency.
Innovation Solution
The proximity sensor design incorporates a ring-shaped sealing member between the housing's circular-cylinder portion and a cap, allowing for easier alignment and fixation of the coil bobbin, improving assembly workability and positional accuracy by using a sealing member like an O-ring that facilitates secure sealing and reduces the complexity of mechanical bonding between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid curable sealing materials are used to fix the cover and housing, then reliable sealing is achieved, but assembly workability deteriorates due to the need for precise positioning and solidification time
Solution Approach 1:
The patent introduces a ring-shaped sealing member as an intermediary component between the cover and housing. This sealing member can be pre-positioned and mechanically fixed, serving as a mediator that provides both sealing function and positioning reference, eliminating the need to rely on liquid sealing materials for positioning while maintaining sealing reliability
Solution Approach 2:
The patent divides the sealing function into separate components: the ring-shaped sealing member handles the sealing task, while the liquid curable sealing material is used only for final fixation. This segmentation allows the sealing member to provide positioning reference during assembly, improving workability while maintaining reliable sealing
2Strength
If liquid curable sealing materials are used for fixation, then strong bonding is achieved, but assembly efficiency deteriorates due to complex positioning requirements
Solution Approach 1:
The ring-shaped sealing member is pre-formed and can be pre-positioned on the cover or housing before final assembly. This preliminary action provides a ready-made positioning reference that simplifies the assembly process, allowing workers to quickly align components without complex positioning procedures while the liquid curable sealing material provides strong bonding strength
3Reliability
If the sealing member deforms, then sealing performance is compromised, but foreign matter intrusion is prevented
Solution Approach 1:
The ring-shaped sealing member acts as an intermediary barrier between the internal sensor components and the external environment. By providing a dedicated sealing interface, it prevents foreign matter intrusion while maintaining proper sealing performance through its structured design that resists deformation under normal operating conditions
Data Source
AI summary
A proximity sensor includes a body, a coil, a cap being cylindrical and having a bottom, a hollow housing, and a ring-shaped sealing member. The body includes the coil bobbin at a first end. The coil is wound around the coil bobbin. The cap is to be placed to a body so as to cover a coil bobbin. The housing includes, at a fist end, a circular-cylinder portion having an opening. The housing is to be placed to the body in such a manner that the cap protrudes from the opening. The sealing member is disposed between the outer peripheral surface of the cap and the inner peripheral surface of the circular-cylinder portion of the housing.