Fuel Cut-Off Unit Attachment Structure for Saddle-Type Vehicles
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Solution Overview
Problem
The existing attachment methods for fuel cut-off units in saddle-type vehicles require a large number of components, making the process complex and time-consuming.
Innovation Solution
A simplified attachment structure for the fuel cut-off unit, featuring a fitting portion with a first locking portion and a second locking portion, which are engaged to securely position and fix the unit to the fuel tank, reducing the number of components and assembly time while ensuring reliable sealing and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float valve is fastened and attached to the fuel tank using a holder and cover member, then the valve device is reliably attached to the fuel tank, but the number of components increases and the structure becomes complex
Solution Approach 1:
The patent combines the holder and cover member into a single integrated fuel cut-off unit structure. The accommodation container serves as both the holder that secures the float valve and the cover that seals the penetration hole, eliminating the need for separate components while maintaining secure attachment to the fuel tank
Solution Approach 2:
The accommodation container performs multiple functions simultaneously: it holds the float valve, seals the penetration hole, provides structural support, and enables attachment to the fuel tank through the locking mechanism. This multi-functional design reduces the total number of components needed in the system
2Reliability
If multiple components are used to fasten the float valve to the fuel tank, then secure attachment is achieved, but the attachment process becomes time-consuming
Solution Approach 1:
The attachment structure is segmented into distinct functional elements: the fitting portion for insertion, the locking portion for secure engagement, and the accommodation container for housing the valve. This segmentation allows each component to be optimized for its specific function while enabling efficient assembly through a straightforward insertion and locking sequence
Solution Approach 2:
The locking portion is pre-formed on the accommodation container in a position that automatically engages with the fuel tank upon insertion. This preliminary positioning eliminates the need for separate alignment or fastening operations during assembly, reducing attachment time while ensuring secure connection
3Ease of operation
If the fitting portion is inserted into the fuel tank through a penetration hole, then the fuel cut-off unit is positioned inside the tank, but external protrusion occurs
Solution Approach 1:
The locking mechanism utilizes the circumferential dimension by forming the locking portion on the outer circumference of the accommodation container. This allows the locking engagement to occur in a direction perpendicular to the insertion axis, enabling the fitting portion to extend outward while the locking action secures the unit in place without requiring the main body to protrude significantly
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
The solution allows for reliable positioning and fixing of the fuel cut-off unit with reduced man-hours, improved airtightness, and efficient discharge of volatile fuel, while minimizing external protrusion and enhancing assembly efficiency.
Implementation Method 1
a first elastic member (D) may be provided between the fixing pedestal (103) and the fuel tank (31)
Implementation Method 2
a second elastic member (W) may be provided between the circumferential wall portion (103E) and the inner wall portion (C1)
Data Source
AI summary
The present invention provides an attachment structure of a fuel cut-off unit (U) that is provided in a fuel tank (31) of a saddle-type vehicle (1), includes a breather passage (114) for discharging volatile fuel to the outside, and includes a valve device (50) for cutting off outflow of liquid fuel. The fuel cut-off unit (U) includes an accommodation container (100) constituted of a fitting portion (U2) which is inserted into the fuel tank (31) at the time of attachment to the fuel tank (31) and a unit exterior portion (U1) which is positioned outside the fuel tank (31). A first locking portion (105) for performing positioning at the time of attachment to the fuel tank (31) is formed in the fitting portion (U2). A penetration hole (C) penetrating from the inside to the outside such that the fitting portion (U2) is inserted therethrough is formed in the fuel tank (31). A second locking portion (F) for fixing the fuel cut-off unit (U) by causing the first locking portion (105) to be engaged from an inner side of the fuel tank is provided in a circumferential edge portion of the penetration hole (C).