Multi-position Tailgate Hinge Assembly for Cargo Access
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Solution Overview
Problem
Conventional vehicle tailgates typically only open in a single trajectory, which limits access to the rear cargo area and protrudes rearward, obstructing the user's ability to stand closer to the bed.
Innovation Solution
A multi-position tailgate assembly with a hinge assembly and winch mechanism that allows the tailgate to achieve three positions: a vertical closed position, a horizontal open position at 90°, and a vertical open position at 180°, enabling increased access and workspace while minimizing obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tailgate opens in a single trajectory (dropped position), then access to the rear cargo area is provided, but the tailgate protrudes rearward blocking the user from standing closer to the vehicle bed
Solution Approach 1:
The tailgate is designed with multi-position capability, allowing it to dynamically change between different positions (closed, dropped at 90°, and fully open at 180°) rather than being fixed in a single trajectory. This dynamic positioning resolves the contradiction by providing access when needed while minimizing obstruction when the tailgate is in the dropped position.
Solution Approach 2:
The hinge assembly is segmented into multiple joints (first hinge and second hinge) that enable independent control of the tailgate's motion in different stages. This segmentation allows the tailgate to achieve discrete positions (90° dropped position and 180° fully open position) rather than continuous single-trajectory movement, resolving the obstruction issue while maintaining access functionality.
2Area of stationary object
If the tailgate is dropped to a horizontal position, then horizontal work space is increased, but the tailgate blocks the user from standing closer to the vehicle bed
Solution Approach 1:
The tailgate can dynamically switch between a dropped horizontal position (90°) for maximum workspace and a fully open vertical position (180°) that reduces rearward protrusion. This dynamic adaptability allows the system to optimize for either workspace or user positioning based on operational needs, resolving the contradiction between these two requirements.
Solution Approach 2:
The hinge assembly enables the tailgate to move not only in the vertical plane (dropped position) but also to rotate further into a fully open vertical position. This additional degree of freedom in another dimension of motion allows the tailgate to achieve the dropped position for workspace while also being able to return to a position that minimizes obstruction.
3Ease of operation
If the tailgate rotates 180° to a vertical open position, then access to the bed is increased, but the hinge assembly complexity increases
Solution Approach 1:
The hinge assembly is divided into two distinct hinge joints (first hinge and second hinge) that work in sequence. The first hinge enables the dropped position, and the second hinge enables the additional rotation to the fully open vertical position. This segmentation of the motion function into separate mechanical joints achieves the enhanced access while organizing the complexity into manageable, modular components.
Solution Approach 2:
The multi-position hinge assembly serves multiple functions: it provides the traditional dropped position for general access, enables the fully open vertical position for enhanced bed access, and can be integrated with existing tailgate structures. This multi-functionality justifies the increased complexity by delivering superior operational versatility.
Data Source
AI summary
A tailgate assembly of a vehicle includes a tailgate configured to provide a boundary of a cargo area, and a hinge assembly coupled to the tailgate and coupled to the vehicle. The hinge assembly is configured to control a trajectory of the tailgate. The tailgate is configured to achieve a vertical closed position, a horizontal open position, and a vertical open position rotated about 180° from the first position. The hinge assembly includes a hinge arm coupled to the vehicle at a first hinge and coupled to the tailgate at a second hinge. In some embodiments, a cable assembly is used to control the position of the tailgate. In the vertical closed position, the cable end is not engaged. In the horizontal open position, the cable end is engaged. In the vertical open position rotated about 180° from the closed position, the cable end is not engaged or under tension.