Articulating Vehicle Bellows with Reduced Panel Count
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Solution Overview
Problem
The assembly of traditional articulating vehicle bellows is labor-intensive, requiring numerous fabric panels and extensive stitching, with large perimeter frames and complex corner designs leading to material waste and potential flex fatigue, while also necessitating manual sealing of seams.
Innovation Solution
A bellows design using a reduced number of flexible pieces and support frames, with a rolled shape and slit-and-tab configuration allowing for easier assembly and fewer seams, and incorporating external and internal support frames that form a seamless channel to prevent penetration, reducing material usage and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional folding construction with numerous fabric panels is used, then the bellows can be assembled with perimeter frames, but the assembly process becomes labor-intensive and time-consuming
Solution Approach 1:
The bellows is divided into modular sections, each comprising a complete set of pleated fabric panels and perimeter frames. This segmentation allows for standardized pre-assembly of sections that can then be quickly connected, reducing overall assembly time while maintaining the protective function.
Solution Approach 2:
Fabric panels are pre-cut with rounded corners and pre-assembled into complete sections with perimeter frames before installation. This preliminary preparation of components with precise geometry eliminates time-consuming on-site adjustments and ensures proper fit during final assembly.
2Strength
If numerous individual fabric panels are used to create pleated sections, then the bellows can be constructed with support frames, but the stitching requirement increases significantly
Solution Approach 1:
Multiple fabric panels are merged into integrated pleated sections where the fabric pieces are joined to form continuous pleated surfaces. This merging reduces the number of separate stitching locations by combining multiple small seams into fewer, more robust joint regions that maintain structural integrity.
Solution Approach 2:
Rounded corners on fabric panels create curved transition zones that distribute stress more evenly across the fabric and stitching points. This curvature eliminates sharp corners that would concentrate stress, thereby strengthening the seams while reducing the need for excessive stitching.
3Stability of the object's composition
If large perimeter frames are used to support the entire bellows perimeter, then the bellows can maintain its shape, but the frames must be assembled section by section increasing complexity
Solution Approach 1:
The large perimeter frame is segmented into smaller, manageable sections that correspond to individual bellows sections. Each frame segment is designed to fit specific pleated sections, allowing for easier handling and assembly while collectively providing the necessary structural support for the entire bellows.
Solution Approach 2:
The perimeter frames are designed with universal connection features that allow the same frame design to be used across multiple sections. This multi-functionality reduces assembly complexity by using standardized components throughout, while the frames collectively maintain the overall bellows shape and stability.
4Shape
If individual corner fabric pieces with rounded shapes are used, then the bellows can transition from horizontal to vertical sides, but material waste increases due to inability to nest closely
Solution Approach 1:
Rounded corner shapes on fabric panels create smooth transitions between horizontal and vertical bellows sides. The curved geometry eliminates sharp corners, distributing stress evenly and allowing the fabric to flex naturally during articulation, while the specific radius is optimized to minimize material waste.
Solution Approach 2:
The corner fabric pieces are designed with specific dimensional parameters optimized for nesting efficiency. By carefully controlling the radius and dimensions of rounded corners, the design achieves the necessary shape transitions while maximizing material utilization and minimizing waste during cutting and assembly.
5Strength
If radius corners are made tight to provide support and prevent sagging, then the bellows maintain structural integrity, but the folds cannot open enough for large extensions when the vehicle turns
Solution Approach 1:
The corner fabric pieces are designed with dynamic characteristics that allow them to adapt between two states: a tighter configuration that provides structural support and prevents sagging when the bellows is stationary, and a more open configuration that allows large extensions when the articulating vehicle turns. The fabric's inherent flexibility enables this dynamic behavior.
Solution Approach 2:
The corner pieces are designed with specific geometric parameters that optimize the balance between support strength and extension capability. The radius and dimensions are carefully selected to provide adequate structural support in the closed position while allowing sufficient opening angle for large vehicle turns, achieving both requirements through parameter optimization.
Data Source
AI summary
A bellows for an articulating vehicle has improved performance by using fewer discrete pieces of flexible material, and a multi-piece frame. By using fewer pieces of flexible material, less stitching is required, which results in improved performance and ease of manufacture.