Electric Toothbrush Vibration Structure Fixing Member Design
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Solution Overview
Problem
Conventional electrical toothbrushes have a shortened useful life due to poor vibration amplitude, leading to increased deformation and noise, and instability caused by the shaft rod colliding with the inner wall of the vibration stem.
Innovation Solution
A vibration structure with a shaft rod, rocking rod, fixing member, and vibration stem design where the fixing member is securely fixed inside the vibration stem, enhancing vibration amplitude and reducing deformation and noise by preventing collision and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vibration amplitude is increased to improve cleaning effect, then the shaft rod deformation increases and causes collision with vibration stem, but this shortens the useful life and increases noise
Solution Approach 1:
The patent introduces a fixing member as a separate component that segments the shaft rod into multiple parts (shaft rod proper and fixing member). This segmentation allows the shaft rod to be reinforced at critical locations without changing the overall vibration mechanism, enabling high vibration amplitude while preventing excessive deformation that would cause collision and reduce useful life.
Solution Approach 2:
The fixing member is designed with specific local properties (thicker structure, different material characteristics) at the location where the shaft rod is most prone to deformation. This local quality enhancement provides targeted reinforcement to prevent collision with the vibration stem while maintaining the overall vibration amplitude for effective cleaning.
2Speed
If the vibration amplitude is increased to improve cleaning effect, then the shaft rod hits and abrades the inner wall of vibration stem, but this causes serious noise
Solution Approach 1:
By segmenting the shaft rod with a fixing member, the patent prevents the shaft rod from excessive deformation and collision with the vibration stem inner wall. This eliminates the source of abrasion noise while preserving the high vibration amplitude needed for effective cleaning.
Solution Approach 2:
The fixing member acts as a preventive measure that stiffens the shaft rod before collision can occur. This beforehand reinforcement prevents the shaft rod from deforming to a point where it would collide and abrade the vibration stem, thereby preventing noise generation in advance.
3Strength
If the shaft rod is made more rigid to reduce deformation, then the vibration transmission may be affected, but the collision and abrasion are avoided
Solution Approach 1:
The fixing member provides localized rigidity enhancement only at the critical section of the shaft rod where deformation occurs. This local quality approach increases strength where needed without over-stiffening the entire shaft rod, thereby maintaining good vibration transmission efficiency while preventing collision and abrasion.
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 design significantly prolongs the useful life of the electrical toothbrush by improving vibration transmission, reducing noise, and enhancing stability through reduced abrasion and improved vibration efficiency.
Implementation Method 1
The weight block is eccentrically arranged to cause unbalance of the rocking rod to deflect from a central axis of the shaft rod
Data Source
AI summary
A vibration structure of electrical toothbrush includes a shaft rod, a rocking rod, a fixing member and a vibration stem. The shaft rod has a first end and a second end. A driving power is applied to the first end to drive and vibrate the shaft rod. One end of the rocking rod is correspondingly inserted in the second end of the shaft rod. A weight block is disposed at the other end of the rocking rod. The weight block is eccentrically arranged to cause unbalance of the rocking rod to deflect from a central axis of the shaft rod. The fixing member is fitted on the rocking rod between the shaft rod and the weight block. The vibration stem is formed with an internal first space. The shaft rod is correspondingly disposed in the first space with the fixing member in contact with inner side of the vibration stem.