Motorcycle Engine Casing as Structural Frame Member
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Solution Overview
Problem
The existing motorcycle engine support structures are heavy and complex, limiting the ability to simplify and reduce the weight of the main frame while maintaining structural integrity.
Innovation Solution
An engine support structure that integrates the engine casing as a part of the motorcycle frame, using mount portions to transmit forces between the head pipe and swingarm, allowing the engine casing to act as a rigidity member, thereby reducing the need for additional frame components and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the main frame is designed as a separate rigid structure to support the engine, then the structural integrity and force transmission are ensured, but the weight and complexity of the main frame increase
Solution Approach 1:
The engine casing is merged with the main frame structure by providing mount portions that directly connect the engine casing to the head pipe and swingarm. This integration allows the engine casing to serve dual purposes: housing engine components and providing structural support, thereby eliminating the need for separate rigid frame structures while maintaining structural integrity
Solution Approach 2:
The engine casing is designed with multi-functionality by incorporating mount portions that enable it to perform both its traditional function of housing engine components and the additional function of providing structural support and force transmission. The first mount portion connects to the head pipe while the second mount portion connects to the swingarm, making the engine casing a universal structural element
2Stability of the object's composition
If additional frame components are added to ensure proper force transmission, then the structural stability is improved, but the device complexity increases
Solution Approach 1:
The mount portions are integrated directly into the engine casing structure, merging the support function with the engine housing. The first mount portion extending from the front surface and the second mount portion extending from the rear surface are structural features of the engine casing itself, eliminating the need for separate frame components
Solution Approach 2:
The engine casing serves as a universal structural element that provides both engine housing and frame support functions. By designing the mount portions as integral parts of the engine casing, the structure achieves stability without adding complexity, as the same component performs multiple functions
Data Source
AI summary
A first main frame segment 62 extends rearwardly from a head pipe 4, a second main frame segment 64 pivotally supports a swingarm 12, and an engine casing EC is disposed between the head pipe 4 and the swingarm 12. The engine casing EC includes a crankcase section 28, a cylinder part 30, a cylinder head part 32 and a transmission casing section 34. The first main frame segment 64 includes a first mount portion 56, which is connected with a front portion of the cylinder part 30, and a second mount portion 58 which is connected with a rear portion of the cylinder head part 32. The second main frame segment 64 includes a third mount portion 60 which is connected with a rear portion of the transmission casing section 34.