Motorcycle Rear Frame Closed Cross-Section Device Mounting
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Solution Overview
Problem
Conventional motorcycle vehicle body frames face difficulties in mounting devices like ABS units and canisters due to interference with surrounding pipes, leading to inefficient assembly and increased manufacturing costs, with limited flexibility in modifying the layout to accommodate these devices, resulting in potential decreases in stiffness and compromised drivability and stability.
Innovation Solution
A vehicle body frame with a rear frame portion featuring a closed cross-section structure, where plate members are joined in the rightward and leftward direction, reducing width while maintaining stiffness, allowing for easier mounting of devices lateral to the frame and adjustable stiffness through thickness and rib reinforcement, thereby avoiding interference and maintaining vehicle width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional pipe frame structures are used with multiple surrounding pipes, then structural stiffness is maintained, but device mounting becomes difficult due to interference with surrounding pipes
Solution Approach 1:
The patent extracts the interfering pipes from the device mounting area by positioning them above the devices. The frame structure separates the pipe routing path from the device placement space, allowing devices to be mounted without interference from surrounding pipes while maintaining structural integrity through the extracted pipe configuration
Solution Approach 2:
The patent utilizes vertical dimension by positioning pipes above devices rather than surrounding them horizontally. This dimensional reorganization creates clear horizontal mounting space for devices while pipes occupy the vertical space above, resolving the interference issue without compromising structural stiffness
2Area of stationary object
If pipe layout is modified to accommodate devices, then device mounting space is created, but stiffness decreases and drivability is compromised
Solution Approach 1:
The frame structure is segmented into distinct functional zones: a device mounting area clear of pipes and a structural support area where pipes are positioned above. This segmentation allows the mounting space to be optimized for device placement while the pipe-containing structural zones maintain the necessary stiffness for drivability
Solution Approach 2:
By moving pipes to the vertical dimension above devices, the horizontal mounting area is freed up without compromising the structural stiffness provided by the pipe framework. This dimensional separation allows both adequate mounting space and maintained frame strength
3Adaptability or versatility
If more devices are mounted on the frame, then functionality is improved, but vehicle width increases
Solution Approach 1:
The patent utilizes the vertical dimension by positioning pipes above devices, which frees up horizontal space. This allows multiple devices to be mounted in the horizontal plane without increasing vehicle width, as the pipe framework occupies the vertical space rather than extending the vehicle's horizontal footprint
Data Source
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AI summary
A vehicle body frame (1) of a motorcycle comprises a front frame portion (3) extending rearward from a head pipe (2), and a rear frame portion (5) extending rearward from a rear end of the front frame portion (3). The front frame portion (3) includes a pair of right and left frame members (30,31). A forward portion of the rear frame portion (5) is a lumber frame (5) having a closed cross-section structure portion in which a pair of right and left steel plates (50,51) are joined together.