Vehicle Back Door Linkage to Reduce Rearward Overhang
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Solution Overview
Problem
Existing door opening and closing systems for vehicles suffer from increased rearward overhang during opening and closing movements, which can obstruct space and functionality.
Innovation Solution
A door opening and closing device featuring a slider and a main link mechanism, where the slider moves along the vehicle's roof in a direction intersecting with the door's width, and the main link mechanism adjusts the door's posture by changing the distance between coupling points, reducing overhang as the door opens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door is opened using a conventional hinge mechanism, then the door can rotate between fully closing and fully opening positions, but the rearward overhang of the door increases during opening and closing movements
Solution Approach 1:
The patent applies the dynamics principle by making the hinge mechanism movable along the roof in the front-rear direction. The hinge position is not fixed but dynamically adjusts during door operation, allowing the hinge to move to the front side as the door opens. This dynamic positioning reduces the rearward overhang of the door during opening and closing movements while maintaining smooth rotational motion.
Solution Approach 2:
The patent introduces a slider as an intermediary component between the hinge and the roof. The slider enables the hinge to move along the roof in the front-rear direction while supporting the door's rotational movement. This intermediary mechanism decouples the door's rotation from a fixed hinge position, allowing the hinge to dynamically adjust its position to minimize rearward overhang.
2Length of moving object
If the hinge is moved to the front side during door opening, then the rearward overhang is reduced, but the door posture stability may be compromised
Solution Approach 1:
The patent implements feedback through the main link mechanism, which automatically adjusts the door posture based on the door opening degree. As the door opens and the hinge moves forward, the main link mechanism detects the change in opening degree and相应ly adjusts the distance between coupling points to maintain optimal door posture. This feedback control ensures stability throughout the door's range of motion.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the distance between coupling points in the main link mechanism according to the door opening degree. As the door opens wider, the coupling points move closer together, changing the geometric parameters of the link mechanism. This parameter adjustment maintains door posture stability while accommodating the hinge's forward movement and reducing rearward overhang.
3Length of moving object
If a slider and main link mechanism are introduced to reduce overhang and stabilize posture, then door control is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated components. The slider not only enables the hinge to move along the roof but also supports the door's rotational movement. The main link mechanism combines posture adjustment and coupling functions in a single integrated system. This merging reduces the number of separate components and simplifies the overall mechanism despite the enhanced functionality.
Solution Approach 2:
The patent applies multi-functionality to the slider and main link mechanism. The slider serves both as a guide for hinge movement and as a support for door rotation. The main link mechanism simultaneously adjusts door posture and accommodates varying opening degrees. These multi-functional components reduce the need for additional specialized parts, thereby limiting the increase in device complexity.
Data Source
AI summary
A door opening and closing device includes a slider and a main link mechanism. The slider moves along a roof of the vehicle body in a front-rear direction, while supporting a proximal end portion of a back door in such a way as to be rotatable around an axis extending in a width direction. The main link mechanism includes one end and an opposite end rotatably coupled to the vehicle body and the back door, respectively. The main link mechanism adjusts a posture of the back door, depending on a door opening degree by changing a distance between a coupling point to the vehicle body and a coupling point to the back door. The main link mechanism decreases the distance as the door opening degree becomes larger.