Vehicular Door Trim Pull Handle Overlap Structure for Joint Rigidity
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Solution Overview
Problem
Vehicular door trims with pull handles having a divided structure suffer from reduced rigidity due to separate members being joined, leading to potential deformation and gaps at connection points, especially when subjected to loads during door closure.
Innovation Solution
A vehicular door trim design featuring an inner and outer member with overlapping portions, including a stopper projection and hole configuration, which restricts movement in the interior-exterior direction, enhancing rigidity and minimizing gaps at connection points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pull handle is produced by joining multiple members separately molded, then complicated shapes can be produced according to various designs, but rigidity is likely to be lowered compared to an integrally molded pull handle
Solution Approach 1:
The inner member is nested within the outer member, with the inner extending portion inserted into the outer extending portion to form an overlapping portion. This nested configuration allows the divided structure to achieve rigidity comparable to an integral structure while maintaining design flexibility through separate molding of the inner and outer members.
Solution Approach 2:
The overlapping portion extends in a direction crossing the plate surface of the trim board, creating a three-dimensional interlocking structure. This dimensional approach strengthens the connection between members perpendicular to the trim board surface, preventing deformation and gap formation while allowing independent molding of each member.
2Reliability
If the pull handle is fixed to the door trim with bolts and nuts or thermal caulking, then the pull handle can be securely mounted, but the fixing portion must be far away from the connection portion, making gap formation more likely
Solution Approach 1:
The overlapping portion with stopper projection and stopper hole is formed in advance during molding, creating a pre-positioned connection structure. This preliminary action ensures that the inner and outer members are precisely positioned relative to each other before mounting, preventing gap formation even when the fixing portion is located far from the connection portion.
Solution Approach 2:
The overlapping portion acts as an intermediary structure between the inner member and outer member, providing a mechanical interlock that maintains their relative positions. This intermediary connection prevents deformation and gap formation at the connection portion, independent of the fixing portion location.
3Volume of moving object
If the inner member and outer member are fitted together with the overlapping portion extending in the interior-exterior direction, then the structure remains compact, but deformation and gaps may occur at the connection portion under load
Solution Approach 1:
The overlapping portion combines the inner extending portion and outer extending portion into a composite interlocking structure. This composite configuration distributes loads across both members and the trim board, preventing deformation and gap formation while maintaining a compact assembly that does not increase overall vehicle door volume.
Data Source
AI summary
A vehicular door trim includes a trim board and a pull handle that includes an inner member, an outer member, and an overlapping portion. The inner member includes an inner extending portion as a peripheral edge portion. The outer member includes an outer extending portion as a peripheral edge portion. The outer member and the inner member are fitted together and define a recess portion and having a connection portion therebetween. The overlapping portion includes the inner and outer extending portions that are overlapped and includes a first overlapping portion fixed to the trim board with a fixing portion in a fixing direction and a second overlapping portion adjacent to the connection portion and extending in a direction crossing a plate surface of the trim board. The second overlapping portion includes a stopper hole and a stopper projection that are fitted by relative movement along the fixing direction.