Motorcycle Swing Arm Pivot Shaft Mounting Structure
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Solution Overview
Problem
The existing swing arm supporting structure for motorcycles is cumbersome due to the increased number of components and complex assembly process, particularly in aligning and mounting the pivot shaft, which hinders easy assembly and disassembly.
Innovation Solution
The proposed solution involves a swing arm supporting structure with a pivot shaft arrangement that includes a cross pipe above the pivot shaft, a center plate member, and a notch on one of the plate members, allowing for easier tool access and nut rotation, thereby simplifying the assembly and integration of components while maintaining structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a female screw is formed on the frame portion for receiving the pivot shaft, then the pivot shaft can be securely mounted, but the number of components increases due to the need for a detachable foot rest bracket and multiple bolts
Solution Approach 1:
The foot rest bracket is merged with the rear arm bracket to form an integral structure, eliminating the need for separate bolts and assembly steps. The bracket is designed with a through hole that allows the pivot shaft to pass through directly, while the foot rest is attached as a single integrated component, reducing the total number of parts while maintaining secure mounting capability.
2Reliability
If the pivot shaft is mounted with the head portion inserted between frame portions, then the swing arm can be securely supported, but the alignment and assembly process becomes complex and difficult
Solution Approach 1:
The bracket is pre-formed with a through hole positioned and sized to receive the pivot shaft directly. This preliminary preparation of the mounting structure eliminates the need for complex alignment procedures during assembly, as the through hole guides and positions the pivot shaft automatically, simplifying the assembly process while ensuring proper support stability.
3Ease of operation
If the cross pipe is positioned above the pivot shaft, then tool access for nut rotation is improved, but the structural compactness is reduced
Solution Approach 1:
The cross pipe is positioned in the vertical dimension above the pivot shaft rather than horizontally adjacent to it. This vertical arrangement creates clearance space for tool access and rotation operations without significantly increasing the horizontal footprint of the structure, thus maintaining structural compactness while improving ease of operation.
Data Source
AI summary
To restrain an increase in the numbers of components and process steps and achieve an easy mounting and dismounting of a pivot shaft. An arm supporting member includes a pair of left and right plate members, a middle cross pipe extending between the plate members and a center pivot plate mounted to the middle cross pipe. A pivot shaft is supported by the plate member and the center pivot plate, and a drive shaft is arranged between the plate member and the center pivot plate. The middle cross pipe is arranged above the pivot shaft on a front portion of a vehicle. The center pivot plate is provided with an upright wall as a receiving portion for aiding the positioning of the bearing member by receiving the bearing member, more specifically, the collar when assembling the swing arm to the center pivot plate and the plate member.