Replacement Brush Head Magnetic Drive for Quiet Swing Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing oral hygiene devices face challenges in controlling the swing arc and swing frequency of the brush head, leading to inconsistent cleaning effectiveness, loud noise during transmission, and high assembly costs.

Innovation Solution

A replacement brush head design featuring a transmission shaft with a damping spring, guide ribs, and a magnetic electroplated iron block that converts linear motion into rotary motion, stabilizing the transmission and reducing noise while allowing precise control over rotation angle and swing frequency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional transmission mechanism is used in the brush head, then the structure is simple, but the swing arc and swing frequency cannot be precisely controlled and the transmission is unstable

Engineering Contradiction:

Improvecontrol precision of swing arc and swing frequencyVSAvoidtransmission structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional mechanical transmission components (gears, linkages) with a magnetic transmission system. A magnetic drive assembly located in the handle section magnetically couples to a transmission shaft in the brush head, transmitting rotational motion through magnetic fields rather than direct mechanical contact. This eliminates complex mechanical transmission structures while enabling precise control of swing arc and frequency through magnetic field modulation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic coupling field as an intermediary between the handle section and brush head. The magnetic drive assembly generates a magnetic field that couples with magnetic components in the transmission shaft, allowing torque and motion transmission without physical contact. This intermediary magnetic field enables stable and controllable transmission while simplifying the overall structure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a conventional transmission mechanism is used in the brush head, then the assembly cost is high, but the transmission process produces loud noise

Engineering Contradiction:

Improvenoise level during transmissionVSAvoidassembly cost and complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent replaces mechanical transmission components (gears, linkages) with a magnetic transmission system. A magnetic drive assembly located in the handle section magnetically couples to a transmission shaft in the brush head, transmitting rotational motion through magnetic fields rather than direct mechanical contact. This eliminates complex mechanical transmission structures while enabling precise control of swing arc and frequency through magnetic field modulation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Inventive Principle:

Principle #24Intermediary (Mediator)

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 achieves stable and quiet operation with controlled rotation angle and swing frequency, enhancing user experience and reducing assembly complexity and costs.

Implementation Method 1

a magnetic electroplated iron block that converts linear motion into rotary motion, stabilizing the transmission

Methodology Applied

Scientific EffectMagnetic coupling: Magnetism

Implementation Method 2

a damping spring, guide ribs, and a magnetic electroplated iron block that converts linear motion into rotary motion, stabilizing the transmission and reducing noise

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentEP4248909B1Replacement brush head and oral hygiene device

Publication Date: 2026.02.25 SHENZHEN YABEIKANG TECH CO LTD

Figure 1~2
Figure 3~5
Figure 6~8

AI summary

The present invention provides a replacement brush head, comprising: a bristle head, a housing, a transmission shaft and a tail cover, the transmission shaft is arranged inside the housing, and the bristle head is arranged in a transmission manner at a top end of the housing through the transmission shaft, and the tail cover is arranged at a tail end of the housing. The replacement brush head and oral hygiene device provided by the present invention converts a linear motion of the transmission shaft device into a rotary motion, effectively controlling the rotation angle and swing frequency of the brush head, realizing the smooth transmission of the brush head, and also reducing the noise caused by the transmission process, and has the technical effect of convenient, fast and low-cost assembly.