Straddle-Type Vehicle Frame Link Member Load Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing structure for supporting a rear arm in straddle-type vehicles, which uses a hydraulic snubber and link mechanism, fails to accurately transmit loads to the hydraulic snubber, leading to potential bending of the cross tube and suboptimal performance.
Innovation Solution
A vehicle body frame design that integrates a head pipe, tank rail, side frame parts, and a link member connecting part, where the rear mount part is formed at the front of the lower coupling part and the link member connecting part is at the rear of the lower coupling part, allowing for improved load transmission and increased stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bracket is supported to only the axially intermediate part of the cross tube, then the structure is simple, but the load is intensively applied to a single location causing the cross tube to bend and load transmission accuracy to deteriorate
Solution Approach 1:
The bracket support structure is segmented into multiple support locations along the cross tube (front end, intermediate part, and rear end). This distributes the load across multiple points rather than concentrating it at a single location, preventing cross tube bending while maintaining structural simplicity. The segmentation of support points directly resolves the contradiction by improving load transmission accuracy without significantly increasing complexity.
2Ease of manufacture
If the bracket support structure is simplified to use a single support point, then ease of manufacture is improved, but the structural stiffness deteriorates and load transmission accuracy is compromised
Solution Approach 1:
The bracket is merged with multiple support functions along the cross tube. Instead of requiring separate support components for each location, the bracket integrates multiple support points (front, intermediate, rear) into a single component that attaches to the cross tube at multiple locations. This merging approach maintains ease of manufacture by using a single bracket component while achieving the structural stiffness of multiple supports.
3Manufacturing precision
If the link mechanism uses a complex multi-point support structure, then load transmission accuracy is improved, but the device complexity increases
Solution Approach 1:
The bracket is designed as a universal component that performs multiple functions: supporting the relay arm, providing multiple attachment points to the cross tube, and facilitating load transmission. This multi-functional design achieves accurate load transmission without requiring separate specialized components for each function, thereby avoiding increased device complexity while maintaining high load transmission accuracy.
Data Source
AI summary
There is provided a vehicle body frame of a straddle-type vehicle. A tank rail extends rearward from a head pipe at an upper side of a power unit. A body frame has a pair of side frame parts extending downward from a rear end side of the tank rail, an upper coupling part couples upper parts of the side frame parts, and a lower coupling part couples lower parts of the pair of side frame parts. Front and rear mount parts support the power unit. Swing arm support parts are provided in the side frame parts. A link member connecting part connects a link member configured to couple the swing arm and a rear cushion each other. The rear mount part is formed at a front part of the lower coupling part, and the link member connecting part is formed at a rear part of the lower coupling part.