Electric Lawn Mower Battery Mounting and Vibration Isolation
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Solution Overview
Problem
Battery-powered electric lawn mowers face challenges with large battery packs and vibration transmission from electric motors, requiring improved mounting and protection mechanisms for efficient operation and ease of use.
Innovation Solution
The electric lawn mower design positions the battery mount higher and rearward of the electric motor, using a battery mount device integrated with a cowling portion to absorb vibrations and facilitate easy mounting and removal, while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery pack is made large to provide sufficient power, then the power capacity is improved, but the size and weight of the lawn mower increase
Solution Approach 1:
The battery pack is positioned in the rear portion of the lawn mower body, utilizing the longitudinal dimension rather than increasing overall width or height. This strategic placement in the rear section allows efficient use of available space without expanding the mower's footprint, resolving the contradiction between power capacity and size.
2Volume of moving object
If the battery pack is positioned close to the electric motor for compact design, then the overall size is reduced, but vibration transmission to the battery increases
Solution Approach 1:
A vibration-absorbing member is introduced as an intermediary component between the battery pack and the mower body. This mediator absorbs vibrations from the electric motor before they reach the battery pack, allowing the battery to be positioned in the rear portion close to the motor without suffering from excessive vibration damage.
Solution Approach 2:
The vibration-absorbing member changes the vibration characteristics by absorbing high-frequency vibrations from the motor. This parameter change in vibration transmission allows safe positioning of the battery in the rear portion while maintaining compact overall dimensions.
3Object-affected harmful factors
If the battery pack is mounted in the rear portion for vibration reduction, then vibration transmission is decreased, but the mounting and removal operations become more difficult
Solution Approach 1:
The battery pack is designed as a separable component that can be independently mounted and removed from the rear portion of the mower body. The battery case is divided into a removable battery pack and a stationary battery holder, allowing easy insertion and extraction operations despite the rear positioning that reduces vibration transmission.
Data Source
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AI summary
An electric lawn mower (1) includes a mower body (10). The mower body (10) includes an electric motor (13) and a cutting blade (14) rotatably driven by the electric motor (13) for mowing a lawn. The mower body (10) further includes a battery mount device (20) configured to be able to hold a battery (21). The electric motor (13) is driven with a supply of electric power from the battery (21). The battery (21) is mounted to the battery mount device (20) at a mount position that is displaced from an axis (J) of the electric motor (13).