Motorcycle Supercharger Relief Passage Layout
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Solution Overview
Problem
In combustion engines of saddle-riding type vehicles, the relief valve and passage interfere with components above the engine, such as fuel tanks, due to their conventional placement above the air intake chamber.
Innovation Solution
The relief passage is positioned below the upper end of the air intake chamber and connected to its outer surface, allowing the relief valve to be placed away from the air intake chamber, thereby preventing interference with components above the engine and increasing the volume for storing pressurized intake air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relief valve and relief passage are disposed above the air intake chamber, then the pressure relief function is achieved, but the relief passage and valve interfere with components above the combustion engine such as fuel tanks
Solution Approach 1:
The relief passage is inverted from the conventional upward orientation to a downward orientation, extending from the front surface of the air intake chamber toward the rear of the vehicle. This inversion allows the relief passage to discharge pressure away from components above the engine, eliminating interference while maintaining the pressure relief function.
Solution Approach 2:
The relief passage is repositioned from a vertical arrangement (above the air intake chamber) to a horizontal arrangement (extending rearward from the front surface). This dimensional change in the horizontal plane allows the relief passage to avoid interfering with fuel tanks and other components located above the engine while still providing effective pressure relief.
2Speed
If the relief valve is disposed close to the air intake chamber, then the pressure relief response is rapid, but the volume for storing pressurized intake air is limited
Solution Approach 1:
The relief system is segmented into two functional zones: the air intake chamber that stores pressurized air, and the relief passage that provides rapid pressure relief. By separating these functions spatially with the relief passage extending rearward, the system achieves both adequate storage volume and rapid response capability.
Solution Approach 2:
The relief passage acts as an intermediary element that connects the air intake chamber to the external environment. This intermediary structure allows the system to maintain a larger air storage volume in the chamber while providing rapid pressure relief through the extended passage that reaches away from the engine area.
3Volume of stationary object
If the air intake chamber is positioned above the combustion engine, then space utilization is improved, but the relief passage must be routed to avoid interfering with components above the engine
Solution Approach 1:
The relief passage routing problem is solved by transitioning from a vertical routing approach to a horizontal routing approach. The passage extends rearward from the front surface of the air intake chamber, utilizing the horizontal space behind the engine rather than navigating vertically around components, thereby simplifying the routing while maintaining effective space utilization.
Data Source
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AI summary
A supercharging system (SY) for a combustion engine (E) of a motorcycle includes a supercharger (42) which pressurizes intake air (I) and supplies the intake air (I) to the combustion engine (E), an air intake chamber (74) which is connected to downstream of the supercharger (42), a relief passage (RP) which relieves the high-pressure intake air (I) within the air intake chamber (74), and a relief valve (80) which is provided on the relief passage (RP). The air intake chamber (74) is disposed above the combustion engine (E), and the relief passage (RP) is disposed below an upper end of the air intake chamber (74). The relief passage (RP) is connected to a front surface of the air intake chamber (74).