Air Control Device Lateral Installation Preserves Fuel Tank Capacity
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Solution Overview
Problem
Existing air control device installations above the fuel tank in straddle-type vehicles interfere with the fuel tank, leading to reduced tank capacity, increased center of gravity, and decreased marketability.
Innovation Solution
The air control device is installed on the lateral side of the cylinder head cover below the fuel tank, utilizing the dead space to avoid interference and maintain the fuel tank's design and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air control device is installed above the engine in a straddle-type vehicle, then the secondary air supply function is achieved, but the fuel tank must be recessed or moved upward, causing decreased tank capacity or increased center of gravity
Solution Approach 1:
The air control device is relocated from the vertical space above the engine to the lateral space beside the cylinder head cover. This dimensional shift from vertical to lateral placement allows the fuel tank to maintain its original position and capacity without recession, while still accommodating the air control device in the available dead space on the side of the engine compartment.
2Object-affected harmful factors
If the fuel tank is moved upward to avoid the air control device, then interference is avoided, but the center of gravity of the vehicle increases
Solution Approach 1:
Instead of moving the fuel tank upward in the vertical dimension, the air control device is placed in the lateral dimension beside the cylinder head cover. This lateral placement eliminates vertical interference with the fuel tank, allowing the fuel tank to remain in its original position and thus maintaining the vehicle's center of gravity at an acceptable level.
3Ease of operation
If the tank bottom surface is recessed to accommodate the air control device, then installation space is secured, but the tank capacity decreases
Solution Approach 1:
The air control device is extracted from the vertical space above the engine and relocated to the lateral dead space beside the cylinder head cover. This extraction eliminates the need to recess the fuel tank bottom surface, thereby preserving the full tank capacity while still providing adequate installation space for the air control device in the lateral position.
4Quantity of substance
If the air control device is installed in the dead space on the lateral side of the cylinder head cover, then the fuel tank design is preserved, but the installation space must be precisely utilized
Solution Approach 1:
The air control device is placed in the lateral dimension beside the cylinder head cover, utilizing previously unused dead space. This lateral placement maintains the fuel tank's original design and capacity while requiring precise positioning to fit within the available lateral clearance between the cylinder head cover and the vehicle body structure.
Data Source
AI summary
An installation structure for an air control device, the air control device being configured to control supply of secondary air from an air cleaner to an exhaust passage of an engine. A cylinder head is located above the engine. A cylinder head cover is installed on the cylinder head. A fuel tank is installed above the cylinder head cover. The air control device is installed on a lateral side of the cylinder head cover below the fuel tank.