Vehicle Body Assembly Structure for Multi-Directional Tolerance Adjustment
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Solution Overview
Problem
Existing vehicle body assembly structures face challenges in adjusting the distance between a vehicle body and parts due to dimensional tolerance variations, particularly in modular assembly, leading to installation issues and aesthetic quality problems.
Innovation Solution
A vehicle body assembly structure featuring a bolt non-rotatably fixed in the vehicle body or part, with a bushing that moves forward and backward within a fastening hole, and a nut that fastens to the bolt, allowing for adjustments in the left-right, front-rear, and up-down directions using a female screw and male screw system, along with a quadrangular prism bolt head and groove for prevention of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spring element is used for tolerance compensation in the adjustment screw, then tolerance in the longitudinal direction can be corrected, but tolerance in directions other than the longitudinal direction cannot be corrected
Solution Approach 1:
The invention transitions from single-direction (longitudinal) adjustment to multi-directional adjustment by enabling the bushing to move not only along the longitudinal axis of the adjustment screw but also in radial directions. This is achieved through the interaction between the sloped threads of the bushing and the adjustment screw, which converts rotational motion into multi-axis positional adjustment, thereby correcting tolerance in left-right, front-rear, and up-down directions simultaneously.
2Manufacturing precision
If a banjo bolt with outer thread and inner thread is used, then tolerance in longitudinal and radial directions can be adjusted, but the structure becomes complex and manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the complex inner thread component from the adjustment mechanism. Instead of using a banjo bolt with both outer and inner threads, the patent employs a simpler structure consisting of an adjustment screw with external threads engaging with a bushing that has sloped threads. This simplification maintains the multi-directional tolerance adjustment capability while significantly reducing structural complexity and manufacturing cost.
Solution Approach 2:
The adjustment screw in the invention performs multiple functions: it provides both the driving mechanism for the bushing and the thread engagement surface. The sloped threads on the bushing work in conjunction with the adjustment screw to achieve both longitudinal and radial adjustment, eliminating the need for separate inner and outer thread systems found in banjo bolts, thereby simplifying the overall structure while maintaining multi-functional capability.
Data Source
AI summary
The present invention relates to a vehicle body assembly structure allowing a distance between a vehicle body and a part to be adjusted in any of left-right, front-rear, and up-down directions with a simple structure such as a screw.