Handheld Machine Battery Attachments for Cooling and Drainage

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Solution Overview

Problem

Electric handheld working machines face challenges in reducing housing size due to the need for sufficient space for motors and batteries, leading to increased size and difficulty in handling, as well as issues with cooling and exposure to rain and foreign materials when batteries are externally attached.

Innovation Solution

The design includes attaching members on the housing with a connecting terminal, a drainage path, and openings that function as both a drainage and cooling airflow path, preventing rain exposure and foreign material entry while allowing efficient cooling of the motor and control board.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of stationary object

If the battery is attached to the outside of the housing, then the size of the housing is reduced, but the connecting terminal of the battery is exposed to rain

Engineering Contradiction:

Improvehousing sizeVSAvoidrain exposure to connecting terminal

Core Design Contradiction:

Volume of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The attaching members are designed to serve multiple functions: they attach the battery to the housing, provide protection from rain through the waterproof structure, and enable cooling of the motor through integrated airflow paths. This multi-functionality resolves the contradiction by combining protection and cooling capabilities in the same external attaching structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Duration of action of moving object

If a large battery is attached to the outside of the housing to increase continuous work time, then the period of time for continuous work is extended, but the battery occupies a considerable area of the surface of the housing making it difficult to provide cooling air flow path

Engineering Contradiction:

Improvecontinuous work timeVSAvoidcooling air flow path provision

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The cooling air flow paths are merged with the attaching members structure itself. The attaching members include openings and internal passages that serve as cooling channels, combining the battery attachment function with the cooling function in a single integrated structure, thereby avoiding additional complexity despite the large battery size.

Inventive Principle:

Principle #5Merging (Combining)

3Temperature

If the motor and control board are disposed near the intake port to enable proper cooling, then cooling efficiency is improved, but foreign materials clog the intake port and adhere to the motor and control board preventing proper cooling

Engineering Contradiction:

Improvemotor cooling efficiencyVSAvoidintake port clogging with foreign materials

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The intake ports are extracted from the housing surface and relocated to the attaching members that extend outward. This positioning extracts the intake function from the vulnerable housing surface area, placing it in a location less susceptible to clogging from foreign materials while maintaining effective cooling airflow to the motor and control board.

Inventive Principle:

Principle #2Taking out (Extraction)

4Ease of operation

If both the motor and battery are stored in the housing, then the housing accommodates all components, but the size of the housing increases making it difficult to handle

Engineering Contradiction:

Improvehandling easeVSAvoidhousing size

Core Design Contradiction:

Ease of operationVSVolume of stationary object

Solution Approach 1:

The system is segmented into two parts: the housing containing the motor and control components, and the battery as a separate externally attachable unit. This segmentation reduces the housing volume to manageable dimensions for easy handling, while the battery can be attached or detached as needed for operation or recharging.

Inventive Principle:

Principle #1Segmentation

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 solution reduces housing size, prevents terminal exposure to rain, enhances cooling efficiency, and maintains operational performance by filtering foreign materials, ensuring proper cooling and easy maintenance.

Implementation Method 1

a step provided above the connecting terminal and configured to function as a drainage path to drain drops of water to sides

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

The openings communicate with a cooling airflow path configured to allow cooing air to flow through a gap between a back surface of the battery attached to the attaching members and the outer surface between the attaching members

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS11648656B2Electric handheld working machine

Publication Date: 2023.05.16 YAMABIKO CORP

AI summary

An electric handheld working machine includes: a housing including: a motor as a drive source of a working unit; an operating handle; and attaching members provided on an outer surface of the housing and configured to attach a battery to supply electric power to the motor. The attaching members includes: a connecting terminal connected to the battery; a step provided above the connecting terminal and configured to function as a drainage path to drain drops of water to sides; and openings formed in the sides of the attaching members to communicate with the drainage path. The openings communicate with a cooling air flow path configured to allow cooing air to flow through a gap between a back surface of the battery attached to the attaching members and the outer surface between the attaching member.