Fuel Filter Positioning for Saddle Riding Vehicle Maintenance
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Solution Overview
Problem
Existing saddle riding type vehicles require increased workload to change the fuel filter due to its placement overlapping the body frame, necessitating removal of the fuel tank, which complicates maintenance and exposes fuel hoses to excessive stress.
Innovation Solution
The fuel filter is positioned in a non-overlapping area surrounded by the head tube, main frames, and down frame, allowing side access and removal without tank removal, with flexible hoses and an elastic cover for protection and easy detachment, reducing stress on fuel hoses and simplifying maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the fuel filter is attached to the bottom of the fuel tank and above the engine cylinder head, then the fuel hose between the fuel pump and the fuel filter is short, but the bend radius permitted when the fuel hose is short becomes large and the bend portion undergoes excessive stress requiring protection
Solution Approach 1:
The fuel filter is repositioned from a vertical arrangement (bottom of fuel tank to cylinder head) to a horizontal arrangement in the space between the fuel tank and engine, allowing the fuel hose to extend laterally rather than vertically. This dimensional change enables the hose to have sufficient length while maintaining a compact layout, reducing bend radius constraints and excessive stress on bend portions.
2Device complexity
If the fuel filter overlaps the body frame when seen from a side of the vehicle body, then the fuel filter can be positioned compactly, but when changing the fuel filter it is necessary to remove the fuel tank from the body frame increasing workload
Solution Approach 1:
The fuel filter is extracted from the space between the fuel tank and engine and repositioned to the space between the main frame and down frame. This extraction allows the fuel filter to be accessed independently from the fuel tank, enabling maintenance personnel to change the fuel filter without removing the fuel tank from the body frame, thereby reducing workload and improving ease of repair.
3Ease of operation
If the fuel filter is positioned in the space between the fuel tank and engine, then the fuel filter can be accessed from the side, but the bend radius of fuel hoses becomes constrained
Solution Approach 1:
The fuel filter is positioned in the lateral space between the main frame and down frame, utilizing the horizontal dimension rather than vertical or longitudinal spaces. This positioning allows fuel hoses to extend and bend laterally without constraining the bend radius, while still providing side accessibility for fuel filter maintenance. The lateral arrangement of the fuel system components enables sufficient hose length and flexibility.
Data Source
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AI summary
A two-wheeled motor vehicle (1) includes a head tube (3), main frames (28) connected to the head tube (3), a down frame (33) connected to the head tube (3) and disposed below the main frames (28), a fuel tank (15) placed on the main frames (28), an engine (17) suspended from the main frames (28), and a fuel filter (65) which, as seen from a side, is disposed in an area surrounded by the head tube (3), the main frames (28) and the down frame (33), and in a position not overlapping any one of the main frames (28), the down frame (33) and the engine (17).