Injection-Molded Toothbrush Head Coupling for Quiet Vibration Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric toothbrushes suffer from complex and loose connections between the toothbrush head and drive shaft, leading to noise during high-frequency vibration.
Innovation Solution
An electric toothbrush head design featuring a connecting cavity with a first insertion channel and a connecting part, formed by injection molding, where the connecting cavity has a higher melting point than the main body and connecting part, and includes elastic walls with locking protrusions to securely attach the drive shaft, ensuring tight and efficient vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional connectors are used to connect the toothbrush head to the drive shaft, then the mechanical movement can be transmitted to achieve high-frequency vibration, but the connection becomes complex and not tight enough
Solution Approach 1:
The connecting cavity is integrally formed with the main body of the toothbrush head through injection molding, merging two previously separate components (connector and toothbrush head body) into a single integrated structure. This eliminates the need for additional connectors while maintaining reliable connection between the drive shaft and toothbrush head.
Solution Approach 2:
The connecting cavity serves multiple functions: it connects the drive shaft to the toothbrush head, transmits high-frequency vibration, and is integrally formed as part of the toothbrush head body. This multi-functional design replaces the need for separate dedicated connectors.
2Power
If connectors are used to transmit high-frequency vibration, then the toothbrush head can vibrate, but loud noise is produced during vibration transmission
Solution Approach 1:
By merging the connecting cavity with the toothbrush head body through integral formation, the patent creates a more rigid and stable connection that efficiently transmits vibration while minimizing noise. The integrated structure reduces loose connections and vibrations between separate components.
3Ease of manufacture
If the connecting cavity and main body are formed as separate parts, then assembly is easier, but the connection is not tight enough for efficient vibration transmission
Solution Approach 1:
The connecting cavity and main body are merged into a single integrated component formed by injection molding. This integral formation ensures tight connection for efficient vibration transmission while maintaining manufacturing simplicity through a single-mold process.
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 allows for effective transfer of high-frequency vibration energy to the toothbrush head, reducing noise and enhancing cleaning and whitening effects by improving connection stability and efficiency.
Implementation Method 1
the connecting cavity is equipped with an elastic wall, and an inner surface of the elastic wall is used for clamping the drive shaft of the electric toothbrush in the first insertion channel
Implementation Method 2
The connecting cavity is integrally formed by injection molding. The main body of toothbrush head is connected to the connecting cavity through the connecting part. The main body of toothbrush head and the connecting part are integrally formed by injection molding.
Implementation Method 3
Existing electric toothbrushes mostly require additional connectors to connect the toothbrush head to the drive shaft, so that the mechanical movement on the drive shaft is transmitted to the toothbrush head to achieve high-frequency vibration of the toothbrush head
Data Source
AI summary
An electric toothbrush head includes a connecting cavity, a connecting part, bristles, and a main body of toothbrush head. The connecting cavity is positioned in an inner cavity, and the connecting cavity is integrally formed by injection molding. A first insertion channel is surrounded and formed by a side wall of the connecting cavity. The first insertion channel is used for insertion of a drive shaft of an electric toothbrush. The main body of toothbrush head is connected to the bristles. The main body of toothbrush head is connected to the connecting cavity through the connecting part. The main body of toothbrush head and the connecting part are integrally formed by injection molding. When the main body of toothbrush head is formed by injection molding, at least one part of the main body of toothbrush head is attached to the connecting cavity to form the connecting part.