3D Intersecting Joint Structure for Liquid-Tight Surface Sealing
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Solution Overview
Problem
Existing joint structures fail to effectively transmit fastening force across three-dimensionally intersecting surfaces, making it difficult to enhance adhesion and achieve a liquid-tight seal between joint surfaces.
Innovation Solution
A joint structure featuring a guide that gradually shortens the distance between sub-joint surfaces as the main joint surfaces are joined, allowing for precise positioning and adhesion of three-dimensionally intersecting surfaces using a fastening member, such as screws, to ensure a secure and sealed connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If two members are fastened to each other such that a joint surface on one side of one member adheres to a joint surface on the one side of the other member, then the fastening force is transmitted on one joint surface, but the fastening force on the other joint surface acts along the surface direction and is not transmitted
Solution Approach 1:
The guide structure transforms the fastening force from a single-plane action to a multi-dimensional force transmission system. By incorporating the guide with an inclined surface, the fastening force is decomposed into components that act both perpendicular to the joint surface (for adhesion) and parallel to the guide's inclined surface (for positioning and sealing). This dimensional transformation enables effective force transmission on both main and sub joint surfaces simultaneously.
Solution Approach 2:
The guide acts as an intermediary element between the fastening member and the joint surfaces. It mediates the force transmission by converting the axial fastening force into directional components that simultaneously achieve adhesion on the main joint surface and sealing on the sub joint surface. The guide's inclined surface serves as the mediating interface that resolves the force distribution problem.
2Ease of manufacture
If conventional fastening methods are used on three-dimensionally intersecting surfaces, then assembly is simple, but it is difficult to enhance adhesion state and seal the joint surfaces in a liquid-tight manner
Solution Approach 1:
The joint structure is segmented into multiple functional surfaces: a main joint surface for adhesion and a sub joint surface for sealing. The guide is further segmented with an inclined surface that directs force specifically to the sub joint surface. This segmentation allows each surface to fulfill its specific function while maintaining overall assembly simplicity.
Solution Approach 2:
The solution introduces a third dimension through the guide's inclined surface, transforming a simple planar fastening problem into a three-dimensional force distribution system. This enables liquid-tight sealing on the sub joint surface without complicating the assembly process, as the guide integrates multiple functions into a single component.
3Ease of operation
If fastening force acts along the surface direction on the other joint surface, then assembly is straightforward, but the fastening force is not transmitted and adhesion cannot be enhanced
Solution Approach 1:
The guide's inclined surface changes the directional parameter of force transmission. Instead of the fastening force acting purely axially or purely parallel to the joint surface, the inclined surface transforms it into a composite force vector with both perpendicular (for adhesion) and parallel (for positioning) components. This parameter change enables effective force transmission while maintaining ease of operation.
Data Source
AI summary
This invention provides a joint structure in which three-dimensionally intersecting joint surfaces of two members can be brought into close contact with each other. The joint structure comprises: a casing 2 having a first main joint surface 24, and a first sub-joint surface 25 that three-dimensionally intersects the first main joint surface 24; a cover 3 having a second main joint surface 34 facing the first main joint surface 24 and a second sub-joint surface 35 facing the first sub-joint surface 25; a guide portion 4 that gradually reduces the facing distance between the first sub-joint surface 25 and the second sub-joint surface 35 as the facing distance between the first main joint surface 24 and the second main joint surface 34 is reduced, and when the second main joint surface 34 is joined to the first main joint surface 24, allows the second sub-joining surface 35 to be joined to the first sub-joining surface 25, and positions the cover 3 with respect to the casing 2; and a screw 5 that fastens the joined first main joint surface 24 and second main joint surface 34 to each other.