Vehicle Tailgate Latch Assembly Self-Locking Mechanism
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Solution Overview
Problem
Existing latch assemblies for vehicle tailgates often require additional hardware to secure the latch in its engaged position, lacking a self-locking mechanism that prevents unintended disengagement.
Innovation Solution
A latch assembly with an actuator, latch, and stopper that moves between unlatched and latched positions, utilizing an overcenter linkage and motion imparting member to self-lock the latch in its engaged state, eliminating the need for external locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional hardware such as a locking pin is used to secure the latch assembly, then the reliability of the latch in its engaged position is improved, but the device complexity increases
Solution Approach 1:
The latch assembly is designed to be self-locking through the overcenter linkage mechanism. The stopper automatically engages with the actuator when the latch transitions to the closed position, securing itself without requiring external locking pins or additional hardware. This self-service mechanism maintains reliability while eliminating the need for extra components.
Solution Approach 2:
The stopper and actuator are integrated into a unified overcenter linkage system where the stopper is positioned to automatically interact with the actuator during latch operation. By merging these functions into a single integrated mechanism, the design achieves secure locking without adding separate locking pins or complex multi-component systems.
2Device complexity
If a simple latch mechanism is used, then the device complexity is reduced, but the latch cannot prevent unintended disengagement
Solution Approach 1:
The overcenter linkage creates a dynamic self-locking effect where the stopper's position relative to the actuator changes automatically with latch movement. When the latch closes, the linkage dynamically positions the stopper to engage with the actuator, creating a mechanical lock that prevents unintended disengagement without requiring complex static locking structures.
3Device complexity
If an overcenter linkage with stopper is used to self-lock the latch, then additional hardware is eliminated, but the manufacturing precision requirements increase
Solution Approach 1:
The overcenter linkage is designed with asymmetric geometry where the stopper and actuator have specific non-symmetric shapes that guide their interaction. This asymmetric design provides natural alignment cues during assembly, reducing the need for high-precision manufacturing tolerances while ensuring proper engagement of the self-locking mechanism.
Data Source
AI summary
A tailgate assembly includes a talegate and latch assembly. The tailgate is moveable between open and closed positions. The latch assembly includes an actuator, a latch, and a stopper. The actuator is operative to move the latch between an unlatched position where the latch allows movement of the tailgate from the closed position, and a latched position where the latch prevents movement of the tailgate from the closed position. The stopper is responsive to movement in the actuator to move between a nonstopping position and a stopping position. In the stopping position, the stopper prevents the latch from moving from the latched position to the unlatched position other than by the actuator.