Luggage Door Hinge Resonance Frequency Reduction
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Solution Overview
Problem
Conventional luggage door hinges face a challenge in reducing the resonance frequency of the luggage door while maintaining fitting rigidity and avoiding a reduction in luggage compartment capacity, especially during engine lock-up in automatic vehicles, where noise occurs due to matching resonance frequencies.
Innovation Solution
A luggage door hinge design that enlarges the curved section to reduce rigidity, coupled with a coupling member that improves the rear side attachment section's rigidity using an 'L' shaped cross-section profile and a beveled portion to minimize height increase, allowing for a lower resonance frequency without compromising fitting rigidity or compartment capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the shape of the curved section of the luggage door hinge is enlarged to reduce rigidity, then the resonance frequency of the luggage door is lowered, but the fitting rigidity of the luggage door is reduced
Solution Approach 1:
The curved section is divided into a front side attachment section, a rear side attachment section, and an intermediate portion. The intermediate portion is further segmented by adding a coupling member that couples it to the rear side attachment section. This segmentation allows different parts to have different rigidity characteristics, enabling the overall curved section to be enlarged for lower resonance frequency while the coupled rear side attachment section maintains fitting rigidity.
Solution Approach 2:
The coupling member is specifically positioned to couple the intermediate portion to the rear side attachment section, creating a localized reinforcement zone. This local quality approach ensures that rigidity is enhanced precisely where needed (at the rear side attachment section for fitting stability) while allowing other areas to maintain lower rigidity for resonance frequency reduction.
2Stability of the object's composition
If the shape of the curved section of the luggage door hinge is enlarged to reduce rigidity, then the resonance frequency of the luggage door is lowered, but the capacity of the luggage room is reduced
Solution Approach 1:
The coupling member is configured with an L-shaped cross-section having an upright panel and a lateral panel. The lateral panel is positioned to extend toward the luggage room, but its placement and dimensions are optimized to minimize intrusion into the luggage room capacity. This dimensional arrangement allows the coupling member to provide structural reinforcement while maintaining adequate space for luggage storage.
3Strength
If a coupling member is added to improve the rigidity of the rear side attachment section, then the fitting rigidity is preserved, but the device complexity increases
Solution Approach 1:
The coupling member is formed as an integrated component with an L-shaped cross-section, combining the upright panel and lateral panel into a single composite structure. This composite design provides both vertical reinforcement (upright panel) and lateral support (lateral panel) simultaneously, achieving enhanced fitting rigidity without requiring multiple separate components or complex assembly procedures.
Data Source
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AI summary
A luggage door hinge (20) including: a front side attachment section (22) that is rotatably supported by a vehicle body (10); a rear side attachment section (24) that extends along a vehicle body front-rear direction in a closed state of a luggage door (12) that opens and closes a luggage room, and that is fixed to the luggage door (12); a curved section (26) that curves in a substantially circular arc shape between the front side attachment section (22) and the rear side attachment section (24), toward a vehicle body lower side in the closed state of the luggage door (12); and a coupling member (30) that couples together an intermediate portion of the curved section (26) and the rear side attachment section (24).