Battery-Powered Power Tool Center of Gravity Adjustment
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Solution Overview
Problem
Battery-powered power tools experience significant user fatigue due to increased vibration and longitudinal moment around the center of gravity, particularly when the center of gravity is far from the working axis of the tool bit, leading to reduced usability.
Innovation Solution
The motor and battery are positioned farther away from the working axis than the mechanical arrangement, with a DC brushless motor and lithium-ion battery used to reduce overall weight and improve balance, bringing the center of gravity closer to the tool bit, and the grip is designed to be held on the side opposite the tool bit with a rearward battery mounting to enhance usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor and battery are positioned farther from the working axis than the mechanical arrangement, then the center of gravity moves closer to the working axis reducing vibration and user burden, but the device complexity increases due to specific weight distribution requirements
Solution Approach 1:
The patent applies dimensional analysis by considering the spatial distribution of components in three-dimensional space rather than simple linear arrangement. By positioning the motor and battery at specific radial distances from the working axis and at transverse positions, the center of gravity is optimized to reduce vibration moment. This spatial optimization resolves the contradiction by achieving better ease of operation through clever geometric arrangement while managing device complexity.
2Ease of operation
If the sum of the weights of the motor and battery is made smaller than the weight of the mechanical arrangement, then the center of gravity moves closer to the working axis reducing longitudinal moment, but the power output may be compromised
Solution Approach 1:
The patent employs parameter changes by specifying that the sum of motor and battery weights should be smaller than the mechanical arrangement weight. This weight ratio parameter optimization allows the center of gravity to position closer to the working axis, reducing the longitudinal moment and improving usability. The contradiction is resolved by carefully selecting component weights to achieve the desired center of gravity position while maintaining adequate power output through efficient motor and battery selection.
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 configuration reduces vibration and longitudinal moment, alleviating user burden and improving usability by bringing the center of gravity closer to the working axis, allowing for easier operation and weight reduction without power loss.
Implementation Method 1
a motor which is driven by power supply from the battery
Implementation Method 2
a battery pack which is detachably mounted to the lower end of the handgrip
Data Source
AI summary
It is an object of the invention to provide a technique for bringing a center of gravity of a battery-powered power tool closer to a working axis of a tool bit in the battery-powered power tool.The battery-powered power tool performs an operation by movement of a tool bit 119 in an axial direction of the tool bit. The power tool includes a battery 110, a motor 111 that is driven by power supply from the battery 110, a mechanical arrangement 113, 115, 117 that drives the tool bit 119 by rotative power transmitted from the motor 111, and a tool body 103 that houses the motor 111 and the mechanical arrangement 113, 115, 117 and has a front end region in which the tool bit 119 is disposed. A sum of weights of the motor 111 and the battery 110 is smaller than a weight of the mechanical arrangement 113, 115, 117.