Metal Eccentric Shaft for Vibrating Toothbrush Durability
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Solution Overview
Problem
Conventional vibrating toothbrushes with plastic eccentric shafts are prone to breakage during strong rotation, lack durability and elasticity, leading to inadequate vibration transmission and increased noise.
Innovation Solution
A vibrating toothbrush with an eccentric shaft partially made of metal, featuring a rotating shaft of nickel titanium, an eccentric weight offset from the rotation center, and shock absorbers to enhance durability and vibration transmission while minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the eccentric shaft is made of synthetic resin to reduce weight and cost, then manufacturing cost is reduced, but durability and elasticity are insufficient leading to breakage during strong rotation
Solution Approach 1:
The patent applies composite materials by combining metal (for durability and elasticity in the rotating shaft) with synthetic resin (for cost-effective components). Specifically, the rotating shaft is made of metal material while other parts of the eccentric shaft assembly use synthetic resin, creating a composite structure that optimizes both durability and manufacturing cost.
2Strength
If the eccentric shaft is made thick to prevent breakage, then durability is improved, but elasticity is not secured and vibration transmission is poor
Solution Approach 1:
The patent applies local quality by making different parts of the eccentric shaft assembly have different material properties where needed. The rotating shaft is made of metal with specific elastic properties to maintain both strength and elasticity, while other components use synthetic resin. This localized material differentiation allows each component to have optimal properties for its specific function.
3Strength
If the eccentric shaft is made thick to prevent breakage, then durability is improved, but noise is increased due to poor vibration transmission
Solution Approach 1:
The patent uses composite materials to resolve the noise issue. The metal rotating shaft properly transmits vibrations, preventing noise generation, while the synthetic resin components provide cost-effective construction. This composite approach ensures both durability and proper vibration transmission to avoid noise.
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 metal eccentric shaft ensures elastic force and tensile strength, effectively suppressing noise and improving vibration transmission efficiency, thus enhancing the durability and performance of the toothbrush.
Implementation Method 1
the rotating shaft formed of a metal material, and connecting the motor fixing part and the eccentric weight
Implementation Method 2
The metal eccentric shaft ensures elastic force and tensile strength
Implementation Method 3
shock absorbers to enhance durability and vibration transmission while minimizing noise
Data Source
AI summary
A vibrating toothbrush and an eccentric shaft are proposed. The vibrating toothbrush includes a head in which bristles are planted, and a handle from which a head coupler protrudes, the head being detachably coupled to the head coupler. The toothbrush includes an electric motor accommodated in the handle to generate rotating force; and an eccentric shaft rotatably connected to the electric motor, at least a portion thereof being eccentric to generate vibration and thereby transmit vibration to the head coupler. The eccentric shaft includes a motor fixing part connected to the electric motor; an eccentric weight configured to be offset from a rotation center of the electric motor; and a rotating shaft formed of a metal material, and connecting the motor fixing part and the eccentric weight.