Electric Chainsaw Handle Layout for Battery Weight Balance
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Solution Overview
Problem
Conventional electric-power-driven chainsaws with motors and batteries positioned rearward of the side handle lead to weight imbalance, reducing output power and charge capacity when a larger battery is used, resulting in shorter operation times.
Innovation Solution
The design positions the motor in the front portion of the body case and the battery rearward, with a side handle extending rearward and downward from the motor, allowing a larger battery to be mounted while maintaining weight balance, enabling easier handling and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a larger battery is mounted on the rear portion of the chainsaw, then the charge capacity and output power are improved, but the weight balance becomes worse when the side handle is gripped
Solution Approach 1:
The side handle is repositioned from a conventional location to extend from the front portion through the rear portion of the body case, with its rear end positioned below the motor output shaft. This spatial reconfiguration in three-dimensional space allows the handle to provide leverage that counterbalances the rearward battery weight, resolving the weight balance issue while accommodating larger battery capacity
2Device complexity
If the motor and battery are both disposed rearward of the side handle, then the structure is simplified, but the weight balance deteriorates when the side handle is gripped
Solution Approach 1:
The side handle extends through the body case from front to rear, with its rear end positioned below the motor output shaft. This creates a lever arm that extends forward of the battery-motor assembly, providing a counterbalancing moment that offsets the rearward weight concentration, thus maintaining weight balance while keeping the motor and battery disposed rearward of the handle's main body
Data Source
AI summary
A chainsaw 1 (electric-power-driven working device) comprises a body case 10, a cutting attachment 20 (work tool), a motor 30 and a battery 90. A front portion 11a of the body case 10 houses the motor 30 and a battery mount-and-release portion 12 is formed on a rear portion 11b of the body case 10. The battery 90 mounted on the battery mount-and-release portion 12 extends in an upper-lower direction across and over a middle portion in a height direction of the rear portion 11b of the body case 10. The side handle 50 arranged to a side face of the body case 10 extends from the front portion 11a to the rear portion 11b of the body case 10. A rear end portion 52 of the side handle is disposed rearward of and below an output shaft 31 of the motor 30.