Vehicle Door Hinge Deformation Control via Fixed Member Geometry
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Solution Overview
Problem
Conventional vehicle door hinges suffer from poor yield and high manufacturing costs due to excessive deformation under side impact, leading to a lack of rigidity and increased risk of internal corner rupture.
Innovation Solution
A vehicle door hinge design featuring a fixed hinge member with a deformation-promoting portion that contacts the mounting surface upon deformation, preventing further bending and enhancing strength by positioning the deformation point within the hinge shaft diameter region, and an L-shaped corner that improves rigidity and manufacturing efficiency by reducing the unfolded shape's lateral size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connecting portion projects backward of the facing side and the pivot portion is tilted, then the door hinge can accommodate deformation, but the unfolded shape becomes larger laterally reducing yield
Solution Approach 1:
The invention changes the geometric parameters of the fixed hinge member by positioning the intersection of the connecting portion at or behind the projection of the facing side, and making the facing side substantially perpendicular to the mounting surface. This parameter optimization maintains deformation resistance while reducing the unfolded lateral size to improve manufacturing yield.
2Force
If the facing side is tilted with respect to the mounting surface, then the hinge can absorb impact forces, but the fixed hinge member deforms greatly at the intersection point
Solution Approach 1:
The invention applies preliminary anti-action by pre-positioning the connecting portion intersection at or behind the facing side projection and orienting the facing side perpendicular to the mounting surface. This preliminary geometric configuration prevents excessive deformation at the intersection point during side impact by optimizing the stress distribution path before the impact occurs.
3Strength
If the unfolded shape is larger laterally to accommodate the connecting portion, then the hinge structure can be more robust, but manufacturing costs increase due to poor yield
Solution Approach 1:
The invention optimizes the geometric parameters of the fixed hinge member by repositioning the connecting portion intersection and orienting the facing side perpendicular to the mounting surface. This parameter change reduces the unfolded lateral size, improving manufacturing yield and reducing costs while maintaining structural robustness through optimized stress distribution.
Data Source
AI summary
In a vehicle door hinge, a moving hinge member is fixed to a mounting surface of a door, and a fixed hinge member is fixed to a mounting surface of a vehicle body. The moving hinge member is pivotally mounted to the fixed hinge member via a hinge shaft. The fixed hinge member has a deformation-promoting portion which meets the mounting surface of the vehicle body at an intersection. An extension line extends from a facing side of the fixed hinge member facing the mounting surface of the door. First and second tangential lines which contact an outer circumference of the hinge shaft extend perpendicular the mounting surface of the vehicle body. The intersection is positioned between the extension line and the second tangential line remote from the extension line compared with the first tangential line. The facing side is formed at right angles or approximate right angles with respect to the mounting surface of the vehicle body, and the fixed hinge member is unfolded to a T-shape.