Eccentric Brush Head Drive for Consistent Low-Noise Oral Cleaning
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Solution Overview
Problem
Existing rotary electric toothbrushes suffer from poor consistency in amplitude and increased noise due to gaps forming between parts over time, affecting cleaning effectiveness and user experience.
Innovation Solution
An electric oral cleaning tool with a transmission rod that is integrally formed and eccentrically arranged, driving a movable disk to oscillate the brush head assembly with minimal parts, reducing energy loss and maintaining amplitude consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple structural assemblies are used to transmit power from handle to brush head, then power transmission is achieved, but assembly difficulty increases and amplitude consistency deteriorates
Solution Approach 1:
The patent combines multiple transmission components (transmission rod, movable disk, brush head assembly) into an integrated structure where the transmission rod is directly connected to the brush head assembly, eliminating the need for multiple separate structural assemblies. This merging reduces assembly complexity while maintaining amplitude consistency through direct mechanical coupling.
Solution Approach 2:
The transmission system is segmented into distinct functional components: the transmission rod for power input, the movable disk for motion conversion, and the brush head assembly for cleaning. This segmentation allows each component to be optimized independently while simplifying the overall assembly process compared to traditional multi-part structures.
2Reliability
If multiple parts are used in transmission structure, then power transmission is achieved, but noise increases and amplitude attenuation occurs after long-term use
Solution Approach 1:
By merging the transmission rod and brush head assembly into a directly connected integrated structure, the patent eliminates gaps between multiple parts that would otherwise generate noise and cause amplitude attenuation. This direct coupling maintains reliable cleaning performance over time while significantly reducing noise generation.
3Duration of action of moving object
If gaps form between parts over time, then wear is normal, but cleaning effectiveness deteriorates and user experience worsens
Solution Approach 1:
The integrated structure where the transmission rod is directly connected to the brush head assembly eliminates inter-part gaps that typically form during service life. This direct mechanical connection ensures that cleaning effectiveness remains consistent throughout the product's service life, maintaining reliability without deterioration.
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 maintains effective cleaning performance and reduces noise over time by minimizing part gaps and energy loss, ensuring consistent brush head movement.
Implementation Method 1
the transmission rod or at least the input end is made of magnetizable material
Data Source
AI summary
An electric oral cleaning tool, including: a housing, a transmission rod, and a brush head assembly. The brush head assembly is rotatably connected to an end of the housing, and a functional element is arranged on a side of the brush head assembly; a movable disk is arranged on another side of the brush head assembly, and the movable disk has a mating area offset from a center of the brush head assembly. The transmission rod is arranged in the housing and has an input end and an output end; the input end is configured to be connected to a transmission mechanism, and the output end is matched with the mating area; in condition of the output end moving with a variable diameter relative to a center of the movable disk, the output end drives the mating area and the brush head assembly to rotate.