Vehicle Door Trim Coupling Device Using Wire and Pulley
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Solution Overview
Problem
Conventional door trim coupling methods for vehicles require high insertion force and result in poor assemblability, with detachment forces being significantly greater, leading to deformation of the door internal panel and necessitating replacement or rework.
Innovation Solution
A door trim coupling device utilizing a wire in a closed loop form with a locking device that winds or unwinds to engage or disengage the mounting device from the door panel, featuring a pulley and clutch system to adjust the wire length and facilitate easy assembly and disassembly without panel deformation.
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 fastener is divided into a head portion and a needle portion that can be separated. The needle portion is inserted into the door internal panel first, then the head portion is attached to the door trim. This segmentation allows the sharp needle to penetrate the panel easily without requiring large insertion force, while the head provides sufficient coupling strength.
Solution Approach 2:
The needle portion acts as an intermediary element that is inserted into the door internal panel to create an insertion hole. This needle serves as a mediator between the fastener head and the door panel, enabling easy penetration while the head portion provides the coupling function.
2Strength
If a fastener is shrink-fitted into the insertion hole to secure the door trim, then the coupling strength is improved, but the detachment force becomes much greater and the detachability deteriorates
Solution Approach 1:
The fastener design allows dynamic behavior: the needle portion can be easily inserted and removed from the door internal panel, while the head portion remains attached to the door trim. This dynamic separation enables easy detachment without requiring large detachment forces, solving the contradiction between strong coupling and easy detachment.
Solution Approach 2:
By separating the fastener into removable needle and stationary head portions, the system allows the needle to be inserted and removed dynamically, while the head provides continuous coupling strength. This segmentation enables the door trim to be detached easily by removing the needle without compromising the coupling strength during assembly.
3Ease of operation
If a fastener is pulled out from the insertion hole to detach the door trim, then the detachability is improved, but deformation of the fastener and door internal panel occurs and rework is required
Solution Approach 1:
The needle portion is designed as a disposable or replaceable component that can be easily removed from the door internal panel without causing deformation. By using a dedicated needle element that can be inserted and removed multiple times, the door panel is protected from deformation, and the needle itself can be replaced if needed without requiring rework to the panel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly improves assemblability and detachability by reducing the forces required, preventing panel deformation and eliminating the need for rework during detachment.
Implementation Method 1
a clutch configured to allow the pulley to rotate in one direction and to prevent the pulley from rotating in the other direction opposite to the one direction
Implementation Method 2
the first clutch may allow the pulley to rotate in a first direction and prevent the pulley from rotating in a second direction opposite to the first direction
Data Source
AI summary
A door trim coupling device for a vehicle may include a wire provided in a closed loop form, a locking device disposed in a door trim of the vehicle and configured to selectively wind or unwind the wire, and a mounting device disposed in the door trim and configured to be engaged with or disengaged from a door panel of the vehicle by winding or unwinding of the wire, wherein the mounting device includes a pulley provided to be rotatable and configured to wind or unwind the wire according to a rotation direction of the pulley, and a clutch configured to allow the pulley to rotate in one direction and to prevent the pulley from rotating in the other direction opposite to the one direction.