Vehicle Fastening Structure With Adjustable Step Alignment
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Solution Overview
Problem
Conventional fastening methods using bolts and nuts in vehicles do not allow for adjustable gaps or steps between components, leading to reduced workability and merchantable quality due to fixed positions, especially during component replacement or changes in body shape.
Innovation Solution
A structure featuring a weld nut fixed to a vehicle floor panel, an inner bolt inserted into the weld nut, and an assembly bolt that applies pressure to an inner protrusion on the inner bolt, allowing the inner bolt to move in the height direction for step adjustment through reverse and forward threads, enabling fine adjustment of the gap or step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a component is fastened to a vehicle body using a bolt and a nut, then the component can be fixedly fastened to the vehicle body, but it cannot adjust the gap or step between the vehicle body and the component
Solution Approach 1:
The fastening system is divided into multiple segments: a weld nut fixed to the vehicle body, an inner bolt that can be adjusted in height, and an assembly bolt that secures the component. This segmentation allows the inner bolt to be independently adjusted to create precise gap or step adjustments between the component and vehicle body while maintaining overall structural integrity.
2Strength
If the nut is welded to one side of the vehicle body, then the component can be securely fastened, but it becomes difficult to adjust the step or gap between the component and another component or vehicle body
Solution Approach 1:
The inner bolt is designed with dynamic adjustability, allowing it to be moved in the height direction to change the step or gap between components. The inner bolt includes an inner bolt stopper that can be positioned at different heights, enabling flexible adjustment while the weld nut remains securely fixed to the vehicle body, thus maintaining both strength and adaptability.
3Manufacturing precision
If an excessive gap or step occurs in a bumper matching part due to accumulation of allowable tolerances, then merchantable quality deteriorates, but it is difficult to finely change an angle of irradiation of light after the lamp is assembled
Solution Approach 1:
The inner bolt is pre-adjusted to the required height and position before the component is assembled to the vehicle body. This preliminary adjustment ensures that the component is positioned with precise gap or step dimensions, preventing excessive gaps or steps caused by tolerance accumulation. The inner bolt stopper is set at the appropriate height to maintain precise positioning during assembly and after assembly, enabling fine adjustment of angles such as lamp irradiation without requiring disassembly.
Data Source
AI summary
A structure for fastening vehicle components with adjustable steps includes a weld nut configured to be fixed to a vehicle floor panel, an inner bolt positioned above and fixedly inserted into the weld nut, and an assembly bolt inserted through the inner bolt and fastened to one end of the weld nut, wherein the inner bolt is configured to move in a height direction for step adjustment.