Rear Saddle Vehicle Structure Chain Guide Roller Mounting
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Solution Overview
Problem
In saddle-type vehicles, the limited space for arranging vehicle-mounted components near the pivot shaft is a challenge due to the deflection of the drive chain between the drive sprocket and the driven sprocket, which restricts the arrangement of components both near the pivot shaft and the seat frame.
Innovation Solution
A rear portion structure that includes a swing arm supporting a rear wheel, a drive chain, and a seat frame with an extending portion that mounts a chain guide roller above the drive chain and air-exhaust pipe, allowing for increased space utilization by positioning the chain guide roller apart from the pivot shaft and integrating a forging member for high rigidity and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chain roller is mounted on the inner side surface of the center frame near the pivot shaft, then the drive chain is prevented from contacting electrical components, but the space for arranging vehicle-mounted components on the upper side of the drive chain is limited
Solution Approach 1:
The chain guide roller is relocated from the conventional position near the pivot shaft to the lower side of the air-exhaust pipe, utilizing the vertical space dimension. This repositioning allows the roller to guide the drive chain while creating additional horizontal space above the drive chain for arranging vehicle-mounted components, thus resolving the space limitation without compromising chain contact prevention.
2Stability of the object's composition
If vehicle-mounted components are arranged considering the deflection of the drive chain, then the susceptibility of swinging motion effects is reduced, but the available space for component arrangement is limited
Solution Approach 1:
By positioning the chain guide roller below the air-exhaust pipe, the design utilizes the vertical clearance to manage drive chain deflection. This creates a two-level arrangement where the roller operates in the lower vertical zone while the upper vertical zone remains available for component placement, thus maintaining stability while expanding available space.
Solution Approach 2:
The chain guide roller acts as an intermediary element that manages drive chain deflection and swinging motion. By placing it in the lower space beneath the air-exhaust pipe, it mediates the chain's movement without interfering with the upper space available for component arrangement, thus resolving both the stability and space constraints.
3Adaptability or versatility
If multiple separate components are used for chain guidance and support, then the functionality is comprehensive, but the number of components and assembly complexity increases
Solution Approach 1:
The chain guide roller is integrated with the seat frame structure, merging the chain guidance function with the existing support structure. This combination eliminates the need for separate mounting brackets and fastening components, thereby reducing the total component count and assembly complexity while maintaining comprehensive chain guidance functionality.
Data Source
AI summary
To provide a rear portion structure of a saddle-type vehicle, which enables securement of a space for arranging vehicle-mounted components on the upper side of a drive chain at a position apart from a pivot shaft. A motorcycle includes a rear wheel swingably provided on a main member via a swing arm, a drive chain entrained about a driven sprocket provided on the rear wheel and a drive sprocket, and a seat frame. An air-exhaust pipe extends from an engine on a lower portion of the seat frame, an extending portion extends rearward of the vehicle from the seat frame, and a chain guide roller is mounted on the extending portion.