Spring Motor Reciprocating Motion Device for Toothbrush
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric toothbrushes with vertical type brush heads face issues of limited vibrating amplitude, complex structure, large volume, high noise, and energy consumption, especially when requiring reversible reciprocating motion, which often necessitates complex mechanical conversion systems and high manufacturing costs.
Innovation Solution
An electric reciprocating motion device utilizing a spring motor with a simplified structure, low volume, and low energy consumption, featuring a reciprocating swing motor, a casing, a mounting bracket, a power source, and a motion head connected to a rotary shaft, along with a motor control circuit board for functional selection and speed control, allowing for easy adjustment of motion without mechanical part changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electromagnetic induction principle is applied to generate electromagnetic vibration for vertical reciprocating motion at the brush head, then the reciprocating motion is achieved, but the structure becomes complicated, volume increases, noise increases, and energy consumption increases
Solution Approach 1:
The patent replaces the electromagnetic induction system with a mechanical reciprocating swing motor. The motor directly generates reciprocating rotational motion through its internal mechanism (crank-connecting rod-piston structure), eliminating the need for electromagnetic vibration generation and subsequent mechanical conversions. This substitution simplifies the overall structure while maintaining the reciprocating motion function.
Solution Approach 2:
Instead of using a conventional motor that produces continuous rotation and then converting it to reciprocating motion through external mechanical devices, the invention inverts the approach by using a motor that directly outputs reciprocating rotational motion. The motor's internal mechanism converts the rotational input into reciprocating rotational output, eliminating the need for external conversion devices.
2Ease of manufacture
If conventional motors with single-direction rotation are used, then the motor structure is simple, but complex mechanical conversion devices are needed to achieve reversible reciprocating motion, increasing structure complexity, volume, and manufacturing cost
Solution Approach 1:
The patent merges the motor function and the mechanical conversion function into a single integrated reciprocating swing motor. The motor's internal mechanism (crank-connecting rod-piston assembly) combines the rotational motion generation with the reciprocating motion conversion, eliminating the need for separate external mechanical conversion devices. This integration simplifies the overall structure while maintaining manufacturing simplicity.
3Device complexity
If eccentric wheel is coupled with output shaft to generate vibration, then the structure is simple, but the vibrating amplitude is relatively smaller
Solution Approach 1:
The patent employs a dynamic reciprocating swing mechanism within the motor that actively generates larger amplitude oscillations compared to a static eccentric wheel. The reciprocating piston and connecting rod mechanism creates variable motion profiles that can achieve larger amplitudes while maintaining structural simplicity. The dynamic nature of the reciprocating mechanism allows for greater motion range than the fixed eccentric offset.
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 provides a compact, easy-to-use, low-noise, and energy-efficient electric toothbrush with adjustable speed and function, eliminating the need for complex mechanical conversions and reducing manufacturing costs, while enabling effective reciprocating motion for oral brushing.
Implementation Method 1
The present invention provides an electric reciprocating motion device with a spring motor, which is adapted for generating a reciprocating rotational output at a rotary shaft of the motor
Data Source
AI summary
An electric reciprocating motion device includes a motor having a rotary shaft for outputting a reciprocating rotational power and a motion head coupling with the rotary shaft and being driven to move in a reciprocating motion along an axis of the rotary shaft and in a predetermined swing angle range. The motor is a spring motor including a motor unit and a torsion spring having two ends affixing at a motor housing and to the rotary shaft respectively. After the rotary shaft outputs a mechanical torque at one rotational direction, the torsion spring applies a spring force against the rotary shaft to drive the rotary shaft to rotate backward for generating the reciprocating rotational power. Using the spring motor in the electric reciprocating motion device, the device achieves the goals of simple mechanical structure, small volume, easy to install, and low in cost.