Eccentric Lid Locking Rod Mechanism for Reduced Closing Resistance
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Solution Overview
Problem
Conventional lid locking devices for vehicles experience increased linear motion resistance due to the axial force applied to the rod, making it difficult to close the lid efficiently.
Innovation Solution
A lid locking device with a supporting rod portion and an engagement rod portion, where the engagement rod is thinner and eccentrically located, reducing the resistance by aligning the axial force closer to the central axis, allowing for smoother operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking engaging portion presses the rod at an outer peripheral portion of the tip face, then the rod can be engaged with the locking engaging portion to lock the lid, but the axial force is applied at a position away from the central axis, increasing linear motion resistance and making it difficult to close the lid
Solution Approach 1:
The rod is designed with an asymmetric cross-section where the locking engaging portion is positioned at the center of one face, while the pressing surface is offset from the central axis. This asymmetric arrangement allows the axial force to be applied closer to the central axis of the rod, reducing linear motion resistance during lid closing while still maintaining proper engagement with the locking engaging portion.
Solution Approach 2:
The rod cross-section is designed as a quadrangle with specific dimensional relationships (where one side length is greater than the other), creating a multi-dimensional geometric configuration. This dimensional design allows the pressing surface to be positioned at a specific location that optimizes the force application point, reducing the moment arm and thereby decreasing linear motion resistance during operation.
2Reliability
If the rod receives axial force at a position away from the central axis, then engagement with the locking engaging portion is achieved, but linear motion resistance increases resulting in increased resistance on operation
Solution Approach 1:
The rod cross-section employs asymmetric dimensions where opposite sides have different lengths. The locking engaging portion is positioned at the center of one face, while the pressing surface is located on an adjacent face at a position that aligns closer to the rod's central axis. This asymmetric configuration reduces the perpendicular distance from the force application point to the central axis, thereby reducing the moment arm and linear motion resistance while preserving the locking function.
Solution Approach 2:
The rod's cross-sectional geometry is specifically designed with dimensional parameters where one side length exceeds the other by a defined amount. This parameter optimization positions the pressing surface at a specific location that minimizes the moment arm for the applied force, reducing linear motion resistance during lid closing operation while maintaining sufficient engagement capability with the locking engaging portion.
Data Source
AI summary
In a lid locking device of the present invention, a first rod constituting portion at the front end of a rod is eccentrically located on a side of the rod which is a side spaced away from the lid at a forward extending region of the second rod constituting portion linearly movably supported at the tip cylindrical portion. Therefore, even where an engagement protrusion piece presses a side close to the lid of a tip swelling face of the first rod constituting portion, the device of the present invention is able to receive an axial force F derived from pressing force at a position closer to the central axis of the second rod constituting portion and also decrease in resistance on operation of closing the lid compared to a conventionally structured device.