Straddle Vehicle Fuel Tank Vertical Rotation Maintenance
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Solution Overview
Problem
The existing fuel tank structures for straddle type vehicles require a larger rotation angle to maintain a wide space below the tank, leading to increased clearance and reduced tank capacity, which complicates maintenance and interferes with vehicle components.
Innovation Solution
The fuel tank is supported on a main frame with a rotation shaft below the tank bottom plate, allowing for reduced clearance and increased maintenance space by positioning the front supporting portion below the fuel tank, and configuring the fuel piping to avoid interference during maintenance, with the side stand improving fuel supply and maintenance access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the swing shaft is disposed behind the front end of the fuel tank, then the fuel tank can be swingably installed, but a larger rotation angle is required which increases clearance and reduces tank capacity
Solution Approach 1:
The patent moves the rotation shaft from a horizontal position (behind the front end) to a vertical position (below the front end), changing the dimension of rotation. This allows the fuel tank to rotate in a vertical plane rather than requiring horizontal clearance, thereby maintaining tank capacity while enabling maintenance access.
2Ease of repair
If the fuel tank is rotated around the supporting portion, then a maintenance space can be formed, but the front portion must be largely recessed to avoid interference
Solution Approach 1:
By positioning the rotation shaft below the front end and enabling vertical rotation, the patent eliminates the need for horizontal recessing of the fuel tank front portion. The maintenance space is created through vertical movement rather than horizontal clearance, preserving the tank's geometric integrity.
3Area of stationary object
If the rotation shaft is positioned below the tank bottom plate, then overlap with main frame is reduced and maintenance space is widened, but the structure becomes more complex
Solution Approach 1:
The patent integrates the rotation shaft support function into the existing front bracket structure that extends from the tank bottom plate. By combining the support function with the existing structural element, the patent widens maintenance space without significantly increasing overall structural complexity.
Data Source
AI summary
A fuel tank structure of straddle type vehicle in which a wide space below the fuel tank can be secured and a clearance portion for avoiding the fuel tank interfering with the vehicle body side can be downsized. The fuel tank is supported on and disposed above a main frame with a fuel pump being installed to a bottom plate of the rear portion of the fuel tank. A maintenance space formed below the fuel pump when the rear portion of the fuel tank is lifted in a state wherein an installation portion of a front bracket installed to the front lower portion of the fuel tank is rotatably supported on the main frame. The fuel tank is configured such that the installation portion of the lower end of the front bracket is disposed below the bottom plate, simultaneously, and is installed to the main frame with a bolt.