Tracked Motorcycle Frame Structure for Independent Suspension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motorcycle designs with endless tracks lack independent suspension and effective steering capabilities, limiting their off-road performance and stability.
Innovation Solution
A frame structure comprising an upper frame pivotably coupled to a lower frame through front and rear brackets, with independent suspension systems and a steering pivot pipe arrangement that allows for relative movement between the frames, enhancing steering and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a motorcycle uses an endless track drive system, then traction is improved, but off-road capability and stability deteriorate due to lack of independent suspension
Solution Approach 1:
The frame is divided into two separate segments: an upper frame and a lower frame. The upper frame carries the seat and upper suspension components, while the lower frame carries the track assembly and lower suspension components. This segmentation allows each frame to move independently, providing independent suspension that improves off-road capability while maintaining the traction benefits of the endless track drive system.
2Weight of moving object
If a motorcycle uses an endless track drive system, then vehicle weight distribution is improved, but steering capability deteriorates
Solution Approach 1:
The steering system is made dynamic by allowing the upper frame to pivot relative to the lower frame through pivot brackets. This relative movement enables the steering mechanism to adapt to terrain variations, maintaining effective steering capability despite the weight distribution benefits provided by the endless track system. The pivot connection allows the steering geometry to change dynamically with suspension movement.
3Reliability
If the frame structure allows relative movement between upper and lower frames, then independent suspension is achieved, but structural complexity increases
Solution Approach 1:
The pivot brackets serve multiple functions: they connect the upper frame to the lower frame, enable independent suspension movement, and provide mounting points for suspension components. By merging these functions into a single structural element, the design achieves independent suspension without proportionally increasing overall structural complexity. The pivot brackets integrate frame connection, suspension articulation, and component mounting into one unified component.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Invention relates to a frame structure for caterpillar motorcycle. The frame comprises an upper frame (1) and a lower frame (10) pivotably coupled to the upper fame (1) through a front bracket (20) and a rear bracket (21). The upper frame (1) comprises a steering pivot pipe (2), a seat support (3) pivotably coupled to the steering pivot pipe (2), a rear lever (4) pivotably interconnecting the seat support (3) to the rear bracket (21), and a front lever (6) pivotably interconnecting the steering pivot pipe (2) to the front bracket (20). The lower frame (10) comprises a lower rear frame (11) pivotably coupled to the rear bracket (21), and a triangle frame (13) pivotally interconnected to the lower rear frame (11) and the front bracket (20). The frame provides independent movement of the lower rear frame (11) and the triangle frame (13) in relation to the upper frame (1).