Alloy Hand-Held Casing for Electric Toothbrush Weight and Strength
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Solution Overview
Problem
Conventional electric toothbrushes are inconvenient to charge and use, occupy large space due to non-compact internal arrangements, are heavy, and have casings made of materials that are prone to deformation, corrosion, and high weight, lacking in mechanical strength and glossiness.
Innovation Solution
A compact electric toothbrush design featuring a brushless motor, rechargeable lithium battery, and a hand-held casing made of a novel alloy material with a specific composition, including neodymium, yttrium, molybdenum, niobium, chromium, zirconium, zinc, titanium, and aluminum, using a die-casting process to create a lightweight, corrosion-resistant, and glossy casing with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic materials are used for hand-held casing, then ease of manufacture is improved, but mechanical strength and glossiness deteriorate
Solution Approach 1:
The patent uses aluminum alloy material for the hand-held casing instead of plastic. The aluminum alloy provides superior mechanical strength, glossiness, and corrosion resistance while maintaining ease of manufacture through die-casting processes. This material substitution resolves the contradiction by achieving both manufacturing feasibility and enhanced mechanical properties.
2Strength
If alloy materials are used for hand-held casing, then mechanical strength and glossiness are improved, but weight increases
Solution Approach 1:
The patent optimizes the aluminum alloy composition with specific elements (aluminum 90-97%, zinc 2-8%, magnesium 1-5%, and trace elements) to achieve the desired balance between strength and weight. By controlling the chemical composition parameters, the casing attains high mechanical strength while maintaining lightweight properties suitable for portable toothbrushes.
3Strength
If alloy materials are used for hand-held casing, then glossiness is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent employs a multi-element aluminum alloy composition including zinc, magnesium, and trace elements (neodymium, yttrium, molybdenum, niobium, chromium, zirconium) that work synergistically to provide both high glossiness and excellent corrosion resistance. The specific compositional ratios ensure the casing maintains its aesthetic appearance while resisting corrosion from moisture and chemicals.
4Ease of manufacture
If internal components are arranged non-compactly, then ease of assembly is improved, but device volume increases
Solution Approach 1:
The patent divides the internal components into distinct functional modules: motor assembly, battery assembly, circuit board assembly, and ultrasonic vibration module. Each module is independently arranged and secured within the hand-held casing, allowing for compact spatial arrangement while maintaining ease of assembly and disassembly for manufacturing and maintenance purposes.
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
The solution results in a toothbrush that is practical, easy to use, quick to charge, comfortable to hold, efficient in cleaning, and has a long product lifetime, with the alloy material providing enhanced mechanical strength, corrosion resistance, and reduced weight, while maintaining a smooth and glossy surface.
Implementation Method 1
The enamel-insulated coil generates magnetic field, the stainless steel spring plate is driven to oscillate leftward and rightward by the magnets, thereby driving the operation of the toothbrush head on the vibration shaft
Implementation Method 2
The brushless motor comprises the vibration shaft, a mount, a fixed front cap and a fixed rear cap. The mount is disposed with a pair of silicon steel sheets mounts arranged parallel to each other. The silicon steel sheets mounts (30) are disposed with silicon steel sheets thereon. The silicon steel sheets are encased by an enamel-insulated coil
Data Source
AI summary
The present invention relates to a toothbrush and provides an electric toothbrush comprising a hollow hand-held casing; the hand-held casing is disposed therein with a rechargeable lithium battery via a battery mount, and a brushless motor via a motor mount. The battery mount accommodates a PCT connected with the rechargeable lithium battery. The PCB is disposed with a control switch via a waterproof mount and a waterproof switch case. The press portion of the control switch is exposed from the switch hole of the hand-held casing. The vibration shaft of the brushless motor passes through the motor mount to an exterior of the hand-held casing. The vibration shaft is connected to a toothbrush head. The hand-held casing is threadedly connected to the rear cap at a bottom end thereof. The hand-held casing has a cross section in shape of a circle.