Brush Head Assembly Deformable Locking Cylinder Torque Transmission
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Solution Overview
Problem
Existing electric toothbrush connection techniques face difficulties in inserting and extracting the drive shaft due to a long stroke process, leading to insufficient locking force, which affects torque transmission and causes the brush head assembly to fall off.
Innovation Solution
A brush head assembly with a deformable locking cylinder and linking component, featuring a V-shaped connecting line between the fulcrum force-receiving part and force applying parts, provides elastic force to lock the drive shaft only when fully inserted, ensuring smooth insertion and extraction while maintaining a strong locking effect for torque transmission and axial retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a c-shaped spring and linking component are used to provide locking force, then the brush head assembly can be locked to the drive shaft, but the insertion and extraction process becomes difficult due to long stroke requirements
Solution Approach 1:
The locking cylinder is designed as a deformable elastic piece that dynamically adjusts its state during insertion and extraction. The V-shaped connecting line enables the locking cylinder to deform elastically, allowing smooth insertion and extraction while maintaining locking force when needed. This dynamic deformation resolves the contradiction between requiring long stroke for locking and needing easy insertion/extraction.
Solution Approach 2:
The locking cylinder changes its physical state from a relaxed state during insertion to a deformed state during locking. The elastic deformation parameter changes allow the locking cylinder to adapt to different positions, enabling easy insertion and extraction while providing sufficient locking force when the drive shaft is fully inserted.
2Adaptability or versatility
If repeated insertion and extraction is performed, then the brush head can be cleaned or replaced, but the locking force becomes insufficient leading to torque transmission problems
Solution Approach 1:
The locking cylinder automatically restores its locking force through elastic recovery after each insertion and extraction cycle. The V-shaped connecting line design allows the locking cylinder to self-reset, ensuring that locking force is consistently maintained after repeated operations without manual intervention or replacement.
Solution Approach 2:
The elastic deformation capability of the locking cylinder allows it to dynamically recover its locking force after each use. The V-shaped geometry enables the locking cylinder to return to its original state, maintaining consistent locking performance across multiple insertion and extraction cycles.
3Reliability
If the locking cylinder applies elastic force throughout the insertion process, then locking is maintained, but the drive shaft becomes stressed during insertion
Solution Approach 1:
The locking cylinder is designed to apply elastic force only after the drive shaft is fully inserted, not during the insertion process. The V-shaped connecting line geometry ensures that the locking action is delayed until the appropriate moment, preventing stress on the drive shaft during insertion while maintaining locking effect afterward.
Solution Approach 2:
The locking cylinder dynamically controls when elastic force is applied - only after full insertion is completed. The V-shaped connecting line design ensures that the locking action is temporally separated from the insertion process, preventing drive shaft stress while maintaining reliable locking.
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 enhances the convenience and reliability of the insertion and extraction process, ensuring a consistent and long-lasting locking force that maintains torque transmission and axial retention, preventing the brush head assembly from falling off during use.
Implementation Method 1
the locking cylinder is elastically deformed to generate elastic force to lock the drive shaft through the two force applying parts
Data Source
AI summary
Provided are a brush head assembly and an electric toothbrush. The brush head assembly comprises a brush head body, a linking component and a locking cylinder; wherein a component assembly cavity is arranged at the tail end of the brush head body, the linking component is installed in the component assembly cavity, and a deformable locking cylinder including a fulcrum force-receiving part and a force applying part with elastic forces at both ends is embedded; the locking cylinder makes most of the strokes of the drive shaft in the insertion process smooth and convenient, only until the two force applying parts are both in contact with the drive shaft, will force be generated to lock the drive shaft, and the locking effect achieved by this elastic force can be maintained for a long time. Thus ensuring the capabilities of torque transmission and axial retention.