Motorcycle Seat Height Adjustment Rotary Link Mechanism
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Solution Overview
Problem
Existing saddle-riding type seat devices in conveyances, such as motorcycles, require more compact and efficient mechanisms for adjusting the seat height, as current systems are bulky and inefficient, affecting the ride quality and space utilization.
Innovation Solution
A seat device with a plate-shaped support member and rotary links that allow for independent adjustment of the seat height, featuring a compact design with fewer fixing points and elastic members to suppress vibration, enabling smoother and more efficient seat positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If drive mechanisms are provided for both front and rear portions of the seat to enable independent height adjustment, then the outer shape of the seat can be freely changed three-dimensionally, but the device becomes bulky and space efficiency is reduced
Solution Approach 1:
The patent merges the front and rear drive mechanisms into a single integrated rotary link assembly. The rotary link has front and rear links that rotate integrally with the support member, allowing both front and rear seat portions to be adjusted by one unified mechanism rather than two separate mechanisms, thereby reducing device volume while maintaining adjustability
Solution Approach 2:
The rotary link mechanism serves multiple functions simultaneously: it adjusts the height of the front seat portion, adjusts the height of the rear seat portion, and enables integral rotation of the support member. This multi-functionality eliminates the need for separate drive mechanisms for each seat portion, resolving the contradiction between versatility and device volume
2Ease of operation
If the support member has sufficient width to accommodate rotary links for height adjustment, then the seat position can be adjusted, but the device becomes less compact and space utilization is reduced
Solution Approach 1:
The rotary links are positioned in the front-to-back direction rather than requiring additional width. The front and rear links are arranged along the longitudinal axis of the support member, utilizing the length dimension instead of expanding the width dimension, thereby maintaining compactness while enabling full seat position adjustment functionality
3Stability of the object's composition
If the front portion of the support member has the same width as the rear portion, then structural symmetry is maintained, but space around the rotary link mounting area is wasted
Solution Approach 1:
The support member is designed with asymmetric dimensions: the front portion has a smaller width than the rear portion. This asymmetry is strategically positioned at the front where the rotary links are mounted, creating space efficiency in the critical area while maintaining adequate width at the rear for structural support and other components, thereby optimizing device volume without compromising stability
Data Source
AI summary
A position adjusting device, which adjusts the position of a seat in a height direction, includes a seat support plate that supports the seat and a rotary link that rotates integrally with the seat support plate when the position of the seat is adjusted. The seat support plate includes a front portion that is positioned directly under an occupant's buttocks when the occupant is seated in the seat, and a rear portion that is positioned on the rear side of the front portion. The rotary link includes a front link and a rear link that are provided at positions different from each other in a front to back direction. The front link and the rear link are mounted on the front portion, and the width of the front portion is smaller than the width of the rear portion.