Front Wheel Suspension Damper Positioning for Straddle Vehicles
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Solution Overview
Problem
Conventional front wheel supporting structures in vehicles with a swing arm mechanism have a damper member positioned low on the vehicle, leading to a low height from the road surface, reduced bank angle, and increased complexity due to longer distances and complicated structures.
Innovation Solution
The front wheel supporting structure positions the damper member rearward of the front wheel and head pipe, incorporates a link mechanism with a bell crank member, and uses additional front arms and connecting members to shorten the distance between the damper and the front arm, enhance responsiveness, and secure a larger bank angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the damper member is disposed on the lower side of the front arm along the vehicle-width direction, then the structure is conventional and simple, but the height of the damper member from the road surface becomes low and a large bank angle cannot be secured
Solution Approach 1:
The damper member is repositioned from a lateral arrangement (vehicle-width direction) to a longitudinal arrangement (vehicle-length direction), specifically disposed between the front arm and the head pipe. This dimensional change in placement allows the damper to achieve a more optimal position that secures a larger bank angle while maintaining structural simplicity
2Device complexity
If the damper member is disposed on the lower side of the front arm, then the conventional structure is maintained, but the distance from the damper member to the arm supporting portion becomes long and the structure becomes complicated
Solution Approach 1:
The damper member is extracted from its conventional position on the lower side of the front arm and repositioned to the space between the front arm and the head pipe. This extraction and relocation shortens the distance from the damper to the arm supporting portion, reducing structural complexity while maintaining the suspension function
3Productivity
If the damper member is positioned with a long distance from the front arm, then the conventional layout is maintained, but the responsiveness of the damper member to vertical movement of the front wheel is reduced
Solution Approach 1:
The damper member is preliminarily positioned in the optimal location between the front arm and the head pipe, where it can immediately and effectively respond to vertical movements of the front wheel. This preliminary placement ensures that the damper is always in the best position to provide suspension action, enhancing responsiveness
4Object-affected harmful factors
If the damper member is disposed low from the road surface, then the conventional position is maintained, but pebbles flicked during running are more prone to hit the damper member
Solution Approach 1:
The head pipe serves as an intermediary structure that protects the damper member from pebble impact. By positioning the damper between the front arm and the head pipe, the head pipe acts as a shield, preventing pebbles flicked during running from directly hitting the damper member
Data Source
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AI summary
A front wheel supporting structure for a vehicle comprises a front arm (10) for supporting a front axle (6) and a suspension mechanism (12) for resiliently suppressing vertical swinging motion of the front arm (10). The suspension mechanism includes a damper member (33) disposed along a lateral direction between a head pipe (1) and the front arm (10), and a connecting member (32, 34) for connecting the front arm (10) with the damper member (33) such that vertical swinging motion of the front arm (10) is converted into lateral motion of the damper member (33).