Hollow Protrusion Joining Structure for Vehicle Interior Parts
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Solution Overview
Problem
Existing joining structures for vehicle interior parts, such as console boxes and door linings, face issues with inefficiency, deformation, and cracking due to increased thickness for rigidity, requiring additional processing and two-step mounting processes, which complicates assembly and exposes defects.
Innovation Solution
A joining structure featuring a first component with a hollow protruding portion and a flange portion, and a second component with a connecting groove and strut portions, allowing for one-directional insertion and compression to clamp the parts together, preventing deformation and cracking, and enabling use without further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the junction between the head and leg portions of the hook is increased to enhance rigidity, then the coupling strength is improved, but defects such as sink, deformation, or crack are produced in the molded part
Solution Approach 1:
The invention transitions from a solid protruding portion to a hollow cylindrical protruding portion, changing the internal structure from solid to cavity-based. This dimensional change allows the junction thickness to be reduced while maintaining or enhancing coupling strength through the hollow structure's inherent rigidity and stress distribution properties, thereby preventing sink, deformation, and crack defects in the molded surface.
Solution Approach 2:
The hollow cylindrical protruding portion creates an internal cavity structure that functions similarly to porous material principles. This hollow structure provides sufficient structural strength and rigidity for coupling while reducing material concentration at the junction, preventing the formation of sink marks and deformations that occur with solid thick junctions during molding.
2Ease of manufacture
If a hole is put through the door trim board for the hook insertion, then the mounting process is enabled, but the hole remains open and the structure cannot be used when appearance is required
Solution Approach 1:
The hollow cylindrical protruding portion of the first component is inserted into the hollow cylindrical recess of the second component, creating a nested configuration. This nesting allows the protruding portion to pass through the second component without requiring an open hole, as the recess provides a receiving cavity that conceals the insertion path, maintaining surface completeness while enabling mounting.
3Reliability
If a two-step mounting process is used (inserting head portion into hole, then sliding hook toward protruding portions), then the coupling is achieved, but the assembly time is increased
Solution Approach 1:
The invention merges the two separate mounting steps into a single insertion action. The hollow cylindrical protruding portion is inserted directly into the hollow cylindrical recess in one motion, simultaneously achieving both the positioning and coupling functions that previously required separate insertion and sliding steps, thereby reducing assembly time while maintaining coupling reliability.
Solution Approach 2:
The hollow cylindrical recess is pre-formed in the second component with dimensions and positioning that guide the hollow cylindrical protruding portion during insertion. This preliminary preparation of the recess geometry ensures that the single insertion action automatically achieves proper alignment and coupling, eliminating the need for subsequent adjustment steps.
Data Source
AI summary
In a joining structure, a protruding portion on the side of a first component is a hollow body that prevents bringing about sinking, deforming, and cracking of the side surface of the first component part, even in the event that the protruding portion is enlarged in order to increase strength for connecting the first component part and a second component part. In addition, the connecting groove on the side of the second component part is also defined by a hollow body that includes a pair of supporting ribs and a supporting plate bridging the pair of supporting ribs. Consequently, the hollow body can prevent defects of sinking, deforming, and cracking in the side surface of the second component part, even in the event that the supporting ribs and the supporting plate are increased in thickness in order to enhance the rigidity of the coupling arrangement between the first and second component parts.