Robot Cleaner Driving Wheel Assembly With Compact Spring Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional robot cleaners face challenges in maintaining consistent frictional force between driving wheels and floor surfaces across various conditions, leading to inconsistent traveling performance due to the wide range of pressure applied by tension coil springs, which also increases the installation space required.
Innovation Solution
A driving wheel assembly utilizing a compression coil spring with a shorter contact distance to the rotation shaft of the driving motor, applying pressure in the tangential direction, and a compact design that minimizes the length change of the coil spring relative to the driving wheel displacement, allowing for stable travel on different floor surfaces while reducing the overall size of the robot cleaner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a tension coil spring is used to apply pressure to the driving wheel, then the driving wheel can be pressed towards the floor surface, but the applied pressure varies widely according to driving wheel displacement and installation space increases
Solution Approach 1:
The patent inverts the conventional approach by using a compression coil spring instead of a tension coil spring. The compression spring is positioned between the housing and the rotary member, pressing the rotary member towards the driving motor. This inversion allows the spring to be pre-compressed during assembly, maintaining consistent pressure on the driving wheel regardless of displacement, while requiring less installation space.
Solution Approach 2:
The patent changes the operational parameters of the spring system by using a compression spring with optimized pre-compression force. The spring is designed with specific initial compression and stiffness characteristics that maintain relatively constant pressing force across the operating range, unlike the tension spring whose force varies linearly with displacement. This parameter optimization resolves the contradiction between force consistency and space requirements.
2Stability of the object's composition
If the length of the tension coil spring is increased to reduce the range of applied pressure, then the pressure consistency improves, but the installation space increases
Solution Approach 1:
The patent inverts the conventional approach by using a compression coil spring instead of a tension coil spring. The compression spring is positioned between the housing and the rotary member, pressing the rotary member towards the driving motor. This inversion allows the spring to be pre-compressed during assembly, maintaining consistent pressure on the driving wheel regardless of displacement, while requiring less installation space.
3Reliability
If pressure is applied to maintain consistent frictional force on various floor surfaces, then traveling performance consistency improves, but the structure becomes more complex
Solution Approach 1:
The patent inverts the conventional approach by using a compression coil spring instead of a tension coil spring. The compression spring is positioned between the housing and the rotary member, pressing the rotary member towards the driving motor. This inversion allows the spring to be pre-compressed during assembly, maintaining consistent pressure on the driving wheel regardless of displacement, while requiring less installation space.
Solution Approach 2:
The compression coil spring automatically adjusts to maintain consistent pressure on the driving wheel across different floor conditions. The spring's elastic properties provide self-regulating force that compensates for variations in wheel displacement, eliminating the need for complex active control mechanisms or multiple adjustment components.
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 ensures stable traveling performance on various floor surfaces and reduces the space required for the pressure application structure, enabling a compact robot cleaner design with improved mobility.
Implementation Method 1
a compression coil spring disposed between the housing and the second unit to apply pressure to the second unit
Implementation Method 2
the driving wheels drive the robot cleaner main body using frictional force generated between the driving wheels and the floor surface contacting the driving wheels
Data Source
AI summary
A driving wheel assembly and a robot cleaner having the same includes a main body and a driving wheel assembly including a driving wheel, a housing, a driving motor, a rotary member with rotation around a rotation shaft of the driving motor, where the rotary member includes a first unit and a second unit disposed at a position opposite to the driving wheel with respect to the rotation shaft of the driving motor, and a compression coil spring disposed between the housing and the second unit to apply pressure to the second unit, where a distance between a contact point where the compression coil spring and the second unit contact and the rotation shaft of the driving motor is shorter than a distance between a rotation shaft of the driving wheel and a rotation shaft of the driving motor.