Toothbrush Drive Shaft Assembly for Axial-Rotational Cleaning Motion
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Solution Overview
Problem
Existing electric toothbrushes provide limited cleaning effectiveness due to the brush heads' inability to perform a combination of axial and rotational motions, leading to insufficient cleaning of tooth surfaces and gaps.
Innovation Solution
A drive apparatus incorporating an axial drive component and a servo rotating assembly that enables the power output shaft to perform both axial and rotational motions, enhanced by an axial auxiliary member to stabilize and limit the movement range, ensuring precise and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the brush head performs only rotational swing motion, then the device structure is simple, but the cleaning effectiveness is limited
Solution Approach 1:
The patent applies dynamics by enabling the power output shaft to perform both axial reciprocating motion and rotational swing motion. The axial drive component drives the shaft along the axial direction while the servo rotating assembly enables rotation around the axial direction, creating compound dynamic motion that significantly improves cleaning effectiveness compared to static rotational motion alone.
Solution Approach 2:
The patent transitions from two-dimensional rotational swing motion to three-dimensional compound motion by adding axial reciprocating motion along the axial direction. This dimensional expansion allows the brush head to clean tooth surfaces more comprehensively by approaching from multiple directions, thereby resolving the contradiction between structural simplicity and cleaning effectiveness.
2Productivity
If the power output shaft performs axial reciprocating motion, then the cleaning coverage is improved, but the movement stability becomes difficult to control
Solution Approach 1:
The patent applies parameter changes by using the elastic deformation portion to dynamically adjust the axial movement range of the power output shaft. The deformation portion's elastic properties allow it to flexibly adapt to different movement requirements, providing both the necessary axial reciprocating motion for expanded cleaning coverage and the stability control needed to maintain reliable operation.
Solution Approach 2:
The deformation portion acts as an intermediary between the axial drive component and the power output shaft. It mediates the transmission of axial driving force while simultaneously limiting the movement range through elastic deformation, thus resolving the contradiction between improving cleaning coverage and maintaining movement stability.
3Productivity
If the axial movement range is increased, then the cleaning efficiency is improved, but the operational reliability decreases
Solution Approach 1:
The deformation portion provides beforehand cushioning by using its elastic properties to absorb and limit excessive axial movement. This pre-established protective mechanism prevents the power output shaft from moving beyond the reliable operational range, thereby maintaining operational reliability while still allowing sufficient axial movement to improve cleaning efficiency.
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 drive apparatus provides enhanced cleaning efficacy by allowing the brush head to perform compound motions, improving oral hygiene through more comprehensive tooth cleaning and ensuring reliable and stable movement.
Implementation Method 1
When the axial drive component drives the power output shaft to move along the first axis, a driving force of the axial drive component overcomes an elastic force of the deformation portion to cause elastic deformation of the deformation portion, and the elastic force of the deformation portion limits the movement range of the power output shaft on the first axis
Data Source
AI summary
The present disclosure discloses a drive apparatus for oral cavity cleaning, a brush handle assembly, and an axial auxiliary member. The drive apparatus at least includes a housing component, a power output shaft, an axial drive component, an axial auxiliary component, and a servo rotating assembly. The housing component extends along a first axis and has an accommodation chamber. The power output shaft extends along the first axis and separately passes through the axial drive component, the axial auxiliary component and the servo rotating assembly, and at least one end of the power output shaft extends out of the housing component. The axial auxiliary component is connected to the power output shaft and the housing component, respectively.