Vehicle Door Trim Wire Coupling Mechanism
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Solution Overview
Problem
Conventional door trim coupling methods for vehicles require high insertion force and result in poor assemblability, and high detachment force leading to deformation of the door internal panel, necessitating replacement or rework.
Innovation Solution
A door trim coupling device utilizing a closed-loop wire system with a locking device and mounting device that includes a guide lever and guide block, allowing for easy engagement and disengagement by winding or unwinding the wire, reducing the force required for assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a fastener is used to couple the door trim to the door internal panel, then the coupling strength is improved, but the insertion force required is large and the assemblability deteriorates
Solution Approach 1:
The patent replaces the conventional fastener insertion mechanism with a wire-based mounting device. The wire is wound around a guide lever to rotate it, which in turn moves the guide block along guide grooves to engage with the door panel. This substitution of direct mechanical insertion with a wire-driven rotational mechanism reduces insertion force and improves assemblability while maintaining coupling strength.
2Strength
If a fastener is shrink-fitted into the insertion hole, then the coupling strength is improved, but the detachment force required is much greater than the insertion force and the detachability deteriorates
Solution Approach 1:
The patent employs a dynamic wire-based mounting device where the guide lever can rotate freely in response to wire winding/unwinding operations. The guide block moves along guide grooves in a controlled manner, enabling easy detachment by simply unwinding the wire. This dynamic mechanism allows the coupling to be as strong during operation but easily detachable when needed, resolving the contradiction between coupling strength and detachability.
3Ease of operation
If a fastener is pulled out from the insertion hole by physical load, then the detachment is achieved, but the deformation of the fastener and door internal panel occurs
Solution Approach 1:
The patent introduces a wire-based mounting device as an intermediary between the door trim and door panel. The guide block, moved by wire-driven guide lever rotation, engages with the door panel through guide grooves. This intermediary mechanism distributes forces evenly during detachment, preventing the concentrated physical loads that cause deformation in conventional fastener systems, thus protecting the door panel while enabling easy detachment.
Data Source
AI summary
A door trim coupling device for a vehicle with improved assemblability and detachability may include a wire provided in a closed loop form, a locking device disposed in a door trim of the vehicle, the locking device being provided to selectively wind or unwind the wire and a mounting device disposed at the door trim and configured to be engaged or disengaged from the door panel of the vehicle by winding or unwinding of the wire. The mounting device includes a guide lever including an insertion hole and a guide groove extending radially from the insertion hole and a guide block slidably coupled to the guide groove and configured to be engaged with or disengaged from the door panel along a sliding direction.