Chainsaw Fuel Tank Integrated With Top Handle
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Solution Overview
Problem
Chainsaws require reduction in size and weight for improved operability, as they are typically cumbersome for operators to carry during use.
Innovation Solution
The fuel tank is integrated with the top handle, reducing the body case size and weight, with the carburetor and fuel tank positioned close to each other to minimize piping length, and the body case is supported by the top handle via elastic members at multiple points to reduce vibration and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the fuel tank is integrated with the top handle, then the body case size and weight are reduced, but the fuel tank position changes to the top handle side
Solution Approach 1:
The fuel tank is integrated with the top handle as a single unit, combining two previously separate components (fuel tank and top handle) into one. This merging reduces the overall number of parts, simplifies the structure, and directly contributes to weight reduction while maintaining functionality.
2Length of moving object
If the carburetor and fuel tank are positioned close to each other, then the piping length is reduced, but the spatial arrangement becomes more constrained
Solution Approach 1:
The carburetor and fuel tank are arranged in a three-dimensional space within the top handle assembly, utilizing vertical and lateral dimensions rather than just linear extension. This spatial optimization allows the components to be positioned close together, minimizing piping length while accommodating the constrained geometry of the integrated handle design.
3Object-affected harmful factors
If the body case is supported by the top handle via elastic members at multiple positions, then the vibration is reduced, but the number of connection points increases
Solution Approach 1:
Elastic members (springs) are installed at multiple connection positions between the body case and top handle to provide vibrational damping. These elastic elements act as vibration isolators, absorbing and attenuating vibrations transmitted between the heavy body case and the handle, thereby reducing the harmful vibrations affecting the operator while maintaining structural support.
4Productivity
If the fuel tank is disposed near the carburetor, then the fuel supply efficiency is improved, but the center of gravity shifts toward the top handle
Solution Approach 1:
The dense fuel tank is strategically positioned within the top handle assembly to optimize the center of gravity location. By carefully selecting the placement coordinates and orientation of the fuel tank, the design achieves a balance between improving fuel supply efficiency (through proximity to the carburetor) and maintaining acceptable handling characteristics, accepting a shift in center of gravity as a trade-off for overall system performance.
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
This design results in a lighter, more compact chainsaw with improved operability due to reduced vibration and enhanced visual perception of downsizing, allowing easier handling and operation.
Implementation Method 1
the body case is supported by the top handle via an elastic member... vibration of the top handle can be suppressed
Implementation Method 2
the top handle and the body case are coupled to each other via the elastic member
Implementation Method 3
The fuel tank is heavy due to the amount of the fuel contained therein. Accordingly, by providing the heavy fuel tank on the top handle side, vibration of the body case can be considerably decreased
Data Source
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AI summary
A chainsaw includes: a body case 20 in which an engine for driving the chainsaw is accommodated; and a top handle 41 provided on an upper side of the body case 20. A fuel tank 7 for storing fuel of the engine is integrally provided to the top handle 41. A carburetor 6 is also provided to the top handle 41. The fuel tank 7 is disposed near the carburetor 6.