Three-Wheeled Vehicle Trunk Body Mounting Alignment
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Solution Overview
Problem
Tolerance stack-up between the conventional motorcycle frame, rear frame, and trunk body in three-wheeled motorcycles often leads to misalignment of the trunk body with the motorcycle frame during manufacturing.
Innovation Solution
A three-wheeled vehicle design featuring a main frame assembly with specific mounting portions and a method of manufacturing that includes securing a rear frame to bosses on the main frame assembly and directly mounting the trunk body to these components, ensuring precise alignment and minimizing misalignment due to tolerance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional motorcycle frame is used as the foundation for three-wheeled vehicle manufacturing, then the ease of manufacture is improved, but the manufacturing precision deteriorates due to tolerance stack-up between frame components
Solution Approach 1:
The frame is divided into separate modular components (main frame assembly, rear frame, trunk body) that can be manufactured independently using conventional processes, then assembled together. This segmentation allows each component to be produced with standard tolerances while the modular connection system manages the cumulative tolerance effects.
Solution Approach 2:
A trunk support assembly acts as an intermediary component between the rear frame and the trunk body. This intermediate structure provides additional mounting points and structural support, helping to distribute and manage tolerance variations across the assembly interface.
2Adaptability or versatility
If multiple components (main frame, rear frame, trunk body) are assembled together, then the adaptability and versatility of the vehicle design is improved, but the manufacturing precision deteriorates due to cumulative tolerance variations
Solution Approach 1:
The vehicle body structure is segmented into distinct assemblies (main frame assembly, rear frame, trunk body) that can be designed, manufactured, and adjusted independently. This modular approach enables versatility in configuration while managing alignment through standardized接口 and mounting mechanisms.
Solution Approach 2:
Mounting portions and attachment features are pre-positioned and pre-aligned during the manufacturing of individual components. This preliminary alignment work is done when components are separate and easier to position accurately, before final assembly where tolerance accumulation would make alignment more difficult.
Data Source
AI summary
A three-wheeled vehicle includes a main frame assembly having a steering head disposed on a front portion of the main frame assembly, a front fork assembly pivotably coupled to the steering head, a front wheel rotatably supported by the front fork assembly, a rear frame coupled to a rear portion of the main frame assembly, a rear axle assembly coupled to at least one of the main frame assembly and the rear frame, a pair of rear wheels rotatably supported by the rear axle assembly, an engine-transmission assembly supported by the main frame assembly and positioned between the front wheel and the pair of rear wheels, and a body including a first mounting portion directly mounted to the main frame assembly, and a second mounting portion directly mounted to the rear frame.