Motorcycle Frame Segmented Side Members for Receiving Space
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional motorcycle frames face limitations in providing a large receiving space due to the size and curvature of side frame members, which restricts the capacity of components like the oil tank and increases vibration, especially with the head tube support pipe interfering with the footrest region.
Innovation Solution
A motorcycle frame design featuring a main pipe unit with a rectangular cross-section head tube-supporting pipe composed of coupled pipe halves, separate front and rear side frame units with varying thicknesses, and a multi-pipe structure at the front upper end to reduce weight and increase rigidity, allowing for a larger receiving space without interference from the head tube-supporting pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the side frame members are formed as one-piece bent pipes to provide high strength, then the structural strength is improved, but the curvature radius must be large which increases the size of the bent part and occupies more space inside the motorcycle casing, thereby limiting the receiving space for components like the oil tank
Solution Approach 1:
The side frame members are divided into multiple segments: a first side frame member with a first bent part, a second side frame member with a second bent part, and a connecting rod connecting them. This segmentation allows each segment to have optimized geometry - the bent parts can use smaller curvature radii while the connecting rod provides the necessary structural linkage, reducing overall space occupation while maintaining strength
Solution Approach 2:
The connecting rod is disposed at a lower position than the bent parts and extends in a direction different from the longitudinal axis of the head tube support pipe. This spatial arrangement in multiple dimensions allows the frame structure to achieve the required strength through distributed geometry rather than relying on large-radius bends in a single plane, thereby freeing up receiving space
2Strength
If the head tube support pipe extends downwardly to the footrest region to provide support, then the structural support function is improved, but it interferes with the space between the side frame members, limiting the size of the receiving space
Solution Approach 1:
The support function is segmented between the head tube support pipe (which provides upper support) and the connecting rod (which provides lower support near the footrest region). This segmentation allows the head tube support pipe to be shortened or repositioned without compromising overall structural support, as the connecting rod compensates by providing support in the lower region, thereby eliminating interference with the receiving space
3Volume of moving object
If the cross bar is disposed between the bent parts of the side frame members to form a receiving space, then the receiving space is created, but the size of the receiving space is still limited due to the presence of the bent parts
Solution Approach 1:
The frame structure is segmented into distinct functional elements - the bent parts serve the steering and support function, while the connecting rod and cross bar form a separate support structure. This segmentation allows the receiving space to be defined by the cross bar and connecting rod rather than being constrained by the bent parts, creating a larger, more regular-shaped receiving space
Solution Approach 2:
The connecting rod is positioned in a different spatial dimension (lower position and different orientation) relative to the bent parts. This dimensional separation allows the receiving space to extend further without interference from the bent parts, increasing the available volume while maintaining structural integrity through the multi-dimensional arrangement
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A motorcycle frame includes a head tube-supporting pipe (32), a pair of front support pipes (41) connected to the head tube-supporting pipe (32), and upper and lower cross tubes (42, 43) . Each front support pipe (41) has a downward section (411), a bottom section (412), and a bent section (410). A receiving space (44) is bounded by the upper and lower cross tubes (42, 43), and by the bent sections (410) and the downward sections (411) of the front support pipes (41). A pair of rear support pipes (51) are respectively connected to the bottom sections (412) of the front support pipes (41). Areinforcementunit (6) includes a pair of reinforcement members (61), each of which interconnects a respective one of the rear support pipes (51) and a respective one of the front support pipes (41).