Saddle Vehicle Intake Cooling via Negative Pressure Formation
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Solution Overview
Problem
Conventional intake structures for saddle type vehicles, such as those with ventilation holes, are insufficient in lowering the temperature of suction air to enhance engine output power.
Innovation Solution
An intake structure with a negative pressure formation section, including a depressed portion and an opening on the vehicle body cover, positioned at a height equal to the inlet, generates a negative pressure to fluidize and cool the air sucked into the intake system, preventing high-temperature air and foreign objects from entering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ventilation hole is provided in the vehicle body cover, then heat of the engine can escape, but the temperature of suction air cannot be sufficiently lowered
Solution Approach 1:
Instead of simply providing a ventilation hole that allows heat to escape passively, the invention inverts the approach by creating a negative pressure formation section that actively draws cool air in from the front of the vehicle. The depressed portion on the rear side creates suction that pulls fresh air through the vehicle body cover, reversing the conventional passive ventilation approach to achieve active cooling of intake air.
Solution Approach 2:
The invention applies pneumatic principles by utilizing air pressure differentials to achieve the desired cooling effect. The negative pressure formation section creates a pressure gradient that drives air flow through the vehicle body cover, using the movement of air itself (rather than mechanical fans or other active devices) to cool the intake air and improve engine output power.
2Reliability
If the vehicle body cover is made solid to prevent foreign article admission, then protection is improved, but air intake for cooling is restricted
Solution Approach 1:
The invention applies local quality by providing a through-hole specifically in the negative pressure formation section where it is most needed for creating the pressure differential, while the rest of the vehicle body cover remains solid for protection. This localized opening strategy allows the cover to maintain its protective function overall while providing the specific air flow pathway needed for cooling in the critical rear section.
Solution Approach 2:
The invention converts the potential harm of open holes (allowing foreign article entry) into a benefit by strategically positioning the through-hole in the negative pressure formation section where the pressure differential naturally directs air flow in a controlled manner. The negative pressure created in this specific location ensures that air flows through the hole in a predictable pattern, cooling the intake air while the overall solid structure continues to protect against foreign articles.
3Temperature
If air flow is increased to cool the suction air, then temperature is lowered, but air current may hit the rider's legs
Solution Approach 1:
The invention applies local quality by positioning the negative pressure formation section and through-hole in a specific location on the rear side of the vehicle body cover, away from the rider's legs. This localized placement ensures that the cooling air flow is generated in a region where it will not directly contact the rider, while still achieving the desired temperature reduction in the suction air through the controlled pressure differential in that specific area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively lowers the temperature of suction air, improves engine output power, and prevents foreign objects and rainwater from entering the vehicle body cover.
Implementation Method 1
a negative pressure formation section configured from a depressed portion at which a vehicle body cover surface is depressed to the inner side of the vehicle body and an opening positioned in the depressed portion is provided
Implementation Method 2
upon operation of the vehicle, a negative pressure is formed in the depressed portion of the negative pressure formation section by an air flow which passes a side of the vehicle
Data Source
AI summary
An intake structure for a saddle type vehicle for effectively lower the temperature of suction air includes an intake system disposed behind an engine supported on a vehicle body frame and a vehicle body cover for covering at least a side of the intake system. An inlet that is open to a side of a vehicle body on the inner side of the vehicle body cover is provided in the intake system. Further, a negative pressure formation section is provided at a position of the vehicle body cover at a substantially equal height to that of the inlet and on the rear side of the vehicle. The negative pressure formation section is configured from a depressed portion at which a vehicle body cover surface is depressed to the inner side of the vehicle body and an opening positioned in the depressed portion.