Reciprocating Rotation Electric Toothbrush via Eccentric Groove Drive

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Solution Overview

Problem

Existing rotation type electric toothbrushes are noisy, consume more power, have short usage time, and pose a safety risk due to potential harm to teeth and gums from full rotation cleaning.

Innovation Solution

A rotation type electric toothbrush design featuring a brush head module with a detachable brush base and cover, a vibration module with an eccentric shaft that drives reciprocating rotation, and a handle module with a groove system, along with soft particles made of thermo plastic elastomer to prevent tooth injury, allowing rotation angles from 0 to 60 degrees.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If full rotation cleaning is used, then cleaning coverage is improved, but noise increases and power consumption increases

Engineering Contradiction:

Improvecleaning coverageVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The toothbrush head performs reciprocating rotation within a limited angle range (0-60 degrees) rather than continuous full rotation, creating periodic cleaning motion that reduces energy consumption while maintaining effective cleaning coverage through repeated strokes

Inventive Principle:

Principle #19Periodic action

2Productivity

If full rotation cleaning is used, then cleaning coverage is improved, but usage time decreases

Engineering Contradiction:

Improvecleaning coverageVSAvoidusage time

Core Design Contradiction:

ProductivityVSDuration of action of moving object

Solution Approach 1:

The reciprocating rotation mechanism allows the brush to return to its starting position, enabling repeated cleaning cycles without requiring continuous forward rotation, thereby extending battery usage time while maintaining cleaning effectiveness

Inventive Principle:

Principle #19Periodic action

3Productivity

If full rotation cleaning is used, then cleaning coverage is improved, but safety decreases due to potential harm to teeth and gums

Engineering Contradiction:

Improvecleaning coverageVSAvoidtooth and gum injury

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The toothbrush implements partial rotation within a controlled angle range (0-60 degrees) rather than full rotation, providing sufficient cleaning coverage through repeated reciprocating strokes while minimizing the risk of excessive force applied to teeth and gums

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The limited rotation angle design preemptively prevents the brush head from rotating too far and applying harmful force to teeth and gums, built into the mechanical structure to ensure safety before harm can occur

Inventive Principle:

Principle #9Preliminary anti-action

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 reduces noise, power consumption, and extends usage time while enhancing safety by minimizing contact with teeth and gums, ensuring effective cleaning without full rotation hazards.

Implementation Method 1

the eccentric shaft rotates eccentrically to contact a side surface of the groove so as to drive the brush base and the brush cover to have a reciprocating rotation synchronously

Methodology Applied

Scientific EffectEccentric rotation: Eccentric

Data Source

PatentUS11779443B2Rotation type electric toothbrush

Publication Date: 2023.10.10 THUMBS UP CROSS BORDER E COMMERCE CO LTD

AI summary

The present disclosure provides a rotation type electric toothbrush. The electric toothbrush includes a brush handle module, a vibration module and a brush head module having a brush base, a brush cover and bristles. The brush cover and the brush base are in a detachable connection. The bristles are disposed on the brush base. The brush base includes a groove. The vibration module includes a motor and an eccentric shaft having a transmission connection with the motor. The eccentric shaft inserts into the groove. When the rotation type electric toothbrush is working, the eccentric shaft rotates eccentrically to contact a side surface of the groove, so as to drive the brush base and the brush cover to have a reciprocating rotation synchronously.