Electric Chainsaw Battery Pack Arrangement for Balance
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Solution Overview
Problem
Conventional electric chainsaws with large high-voltage battery packs are expensive and lack versatility, making them unsuitable for widespread use, while small standard battery packs are not effectively integrated into the design without compromising operability.
Innovation Solution
The electric chainsaw uses a set of commonly used small battery packs arranged at the back of the main housing to maintain the center of gravity within a specific range, ensuring balanced weight distribution and easy attachment/detachment, allowing for high output and extended use with series or parallel connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large high-voltage battery pack is used to drive high output electric motor, then the power and output of the chainsaw is improved, but the cost increases and versatility decreases
Solution Approach 1:
The large high-voltage battery pack is segmented into multiple small standard battery packs (e.g., two 18V packs to achieve 36V). This allows the chainsaw to use common standardized battery packs that have broader versatility across different tools, while still achieving the required power output through series or parallel connections.
Solution Approach 2:
By using standard common battery packs instead of specialized large battery packs, the battery system gains universality. The same standard battery packs can be used across different cordless tools (drills, saws, vacuums, etc.), reducing the need for multiple specialized battery types and improving overall versatility.
2Adaptability or versatility
If a set of commonly used small battery packs is arranged at the back part of the main housing, then the versatility and cost are improved, but the center of gravity position and operability may be affected
Solution Approach 1:
The battery packs are arranged in a specific local configuration at the back part of the main housing, with precise positioning to achieve the desired center of gravity location. This localized optimization ensures that the battery arrangement provides both versatility (using standard packs) and maintains proper weight distribution for operability.
Solution Approach 2:
The battery packs are arranged asymmetrically or in a specific non-uniform pattern at the back housing to achieve the target center of gravity position within the specified range. This asymmetric arrangement allows optimization of both versatility (using standard packs) and operability (proper weight balance).
3Ease of operation
If the center of gravity is positioned within the specified range, then the operability and weight balance are improved, but the battery pack arrangement complexity increases
Solution Approach 1:
The center of gravity position is calculated and determined in advance during the design phase. The battery packs are pre-positioned at specific locations in the back housing to achieve the target center of gravity range (within 1.5 times the width of the grip section from the center line). This preliminary planning simplifies the actual assembly process while ensuring proper operability.
Data Source
AI summary
To provide an easy-to-use electric chainsaw that uses, in place of a large battery pack with a high voltage rating that would have been used in conventional electric chainsaws, a battery power source composed of a set of small commonly used battery packs of the same rating. An electric chainsaw having a built-in electric motor that is powered by a rechargeable battery, wherein a set of commonly used battery packs of the same rating is used as the rechargeable battery. The set of battery packs is mounted at the back of the main housing so that the center of gravity (G) of the chainsaw is positioned within a range (R) of 1.5 time the width (W) of the grip section of a rear handle between the left and right sides of a center line that is centered in the horizontal direction.