Fuel Hose Routing Between Throttle Cables in Straddled Vehicle
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Solution Overview
Problem
In straddled vehicles, the proximity of the injector to the throttle drum can cause interference between the fuel hose and throttle cables, leading to potential bending issues and increased load on the fuel hose, which complicates the arrangement and increases costs.
Innovation Solution
The fuel hose is configured to pass between the first and second throttle cables, eliminating the need for sharp bends and allowing the injector to be positioned closer to the throttle drum, using a resin hose for increased rigidity and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the injector is disposed relatively close to the throttle drum, then the device complexity is reduced and space is saved, but the fuel hose and throttle cables interfere with each other
Solution Approach 1:
The fuel hose routing transitions from a planar arrangement (above or below the cables) to a three-dimensional configuration by passing the fuel hose through a cavity or passage in the throttle drum body. This dimensional change allows the fuel hose to occupy space between the cables without interfering with either, enabling compact injector positioning while eliminating interference.
2Object-affected harmful factors
If the fuel hose is extended to pass above or below the throttle cables, then interference is avoided, but the fuel hose is bent sharply causing increased load
Solution Approach 1:
The fuel hose is routed through a cavity or passage within the throttle drum body, nesting the hose inside the structural volume of the drum. This eliminates the need for external sharp bends and allows the hose to follow a gradual, protected path from the injector to the throttle cable connection point, reducing mechanical stress and load on the hose.
3Ease of manufacture
If a resin fuel hose is used, then costs are reduced and rigidity is increased, but the hose is more susceptible to load at connection portions and bent portions
Solution Approach 1:
The throttle drum structure is designed in advance to include a dedicated cavity or passage for the fuel hose, and the hose is pre-routed through this protected pathway. This preliminary structural preparation ensures that when the resin hose is installed, it follows a predetermined load-distributing path that avoids concentration of stress at connection points or sharp bends, thereby maintaining hose strength while using cost-effective resin material.
Data Source
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AI summary
A motorcycle 1 includes: an injector 60 attached to an internal combustion engine 4; an intake passage 38 connected to the internal combustion engine 4; a throttle valve 40 disposed in the intake passage 38; a throttle drum 42 connected to the throttle valve 40, a first throttle cable 51 and a second throttle cable 52 connected to the throttle drum 42; and a fuel hose 70 connected to the injector 60. The fuel hose 70 has an intersection portion 75 passing between the first throttle cable 51 and the second throttle cable 52.