Insulation Structure for Mower Output Shaft and Blade

Solution Overview

Problem

Existing electric garden tools face challenges in implementing double insulation between the motor, output shaft, and blade assembly due to cost and design constraints, leading to potential safety hazards.

Innovation Solution

An insulation structure comprising a connecting base made of insulating material with output shaft and blade connecting portions, along with an insulation cover, ensures double insulation by isolating the output shaft and blade, using fastening members and a detachable insulation cover to prevent electrical conduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If double insulation is implemented between motor, output shaft and blade assembly, then safety against electric shock is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvesafety against electric shockVSAvoidinsulation structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the additional insulation function with the existing connecting base structure. The connecting base integrates both the output shaft connecting portion and blade connecting portions, merging mechanical connection and electrical insulation functions into a single component. This eliminates the need for separate insulation elements, thereby improving safety without proportionally increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connecting base is designed to serve multiple functions: it connects the output shaft to the blade assembly mechanically while simultaneously providing electrical insulation between these components. The insulating material in the connecting base acts as both a structural element and an insulation barrier, reducing overall device complexity by eliminating dedicated insulation components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If double insulation is implemented between motor, output shaft and blade assembly, then safety against electric shock is improved, but manufacturing cost increases

Engineering Contradiction:

Improvesafety against electric shockVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines the additional insulation function with the existing connecting base structure. The connecting base integrates both the output shaft connecting portion and blade connecting portions, merging mechanical connection and electrical insulation functions into a single component. This eliminates the need for separate insulation elements, thereby improving safety without proportionally increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connecting base is designed to serve multiple functions: it connects the output shaft to the blade assembly mechanically while simultaneously providing electrical insulation between these components. The insulating material in the connecting base acts as both a structural element and an insulation barrier, reducing overall device complexity by eliminating dedicated insulation components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If insulation structure is added between output shaft and blade, then additional insulation is improved, but device complexity increases

Engineering Contradiction:

Improveadditional insulationVSAvoidoverall device complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the additional insulation function with the existing connecting base structure. The connecting base integrates both the output shaft connecting portion and blade connecting portions, merging mechanical connection and electrical insulation functions into a single component. This eliminates the need for separate insulation elements, thereby improving safety without proportionally increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connecting base is designed to serve multiple functions: it connects the output shaft to the blade assembly mechanically while simultaneously providing electrical insulation between these components. The insulating material in the connecting base acts as both a structural element and an insulation barrier, reducing overall device complexity by eliminating dedicated insulation components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP3622797B1Insulation structure and mower

Publication Date: 2022.03.30 SKYBEST ELECTRIC APPLIANCE (SUZHOU) CO LTD

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AI summary

Disclosed is an insulation structure used for an electric garden tool. The electric garden tool comprises: a shell; an electric motor (2) arranged on the shell and used for providing power, the electric motor comprising an output shaft (22); and a blade (14) connected to the output shaft (22), the electric motor (2) driving the blade (14) to work in a rotating manner by means of the output shaft (22). The insulation structure is arranged between the output shaft (22) and the blade (14) so as to realize an insulation matching connection between the blade (14) and the output shaft (22), wherein the insulation structure comprises a connecting base (3), the connecting base (3) comprises a main body portion (31) made of insulating materials, the main body portion (31) is provided with an output shaft connecting portion connected to the output shaft (22) in a fastening and matching manner, and at least two blade connecting portions connected to the blade (14) in a fastening and matching manner, and the output shaft connecting portion is isolated from any one blade connecting portion in an insulated manner. Further disclosed is a mower comprising the insulation structure.