Robotic Lawn Mower Wheel Brush Shielding Against Grass Buildup
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Solution Overview
Problem
Robotic lawn mowers face challenges in efficiently removing cut grass and other debris from their drive wheels, which often adhere due to the design of existing cleaning devices.
Innovation Solution
The robotic lawn mower is equipped with wheel brush devices positioned between the drive wheels and swivelable wheels, featuring brush bristles held by holding means and protected by grass shields, which can rotate to effectively clean the wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wheel brush devices are positioned between drive wheels and swivelable wheels to clean the drive wheels, then cleaning accessibility is improved, but cut grass from the cutting disc adheres to the brush bristles reducing cleaning effectiveness
Solution Approach 1:
A grass shield is introduced as an intermediary component between the cutting disc and the wheel brush device. This shield prevents cut grass from reaching and adhering to the brush bristles, allowing the brush device to maintain its cleaning function without being contaminated by grass debris.
Solution Approach 2:
The cleaning system is segmented into distinct functional zones: the cutting disc for grass cutting, the grass shield for debris containment, and the wheel brush device for wheel cleaning. This segmentation allows each component to perform its specific function without interference from other parts of the system.
2Productivity
If brush bristles are arranged to contact the drive wheel surface for cleaning, then cleaning coverage is improved, but brush bristles accumulate cut grass and debris
Solution Approach 1:
The grass shield acts as a protective intermediary that blocks cut grass and debris from reaching the brush bristles. This allows the bristles to maintain contact with the drive wheel for comprehensive cleaning coverage without accumulating grass contamination.
Solution Approach 2:
The harmful element (cut grass and debris) is extracted or removed from the interaction between the cutting disc and the wheel brush device through the grass shield. This separation prevents the brush bristles from coming into contact with and accumulating grass material.
3Productivity
If wheel brush devices are equipped with rotating brush bristles for effective wheel cleaning, then cleaning efficiency is improved, but device complexity increases
Solution Approach 1:
The wheel brush device is designed to be self-driven, where the rotation of the drive wheel itself powers the rotation of the brush bristles through friction or direct mechanical coupling. This eliminates the need for separate motors or power sources, maintaining high cleaning efficiency while minimizing device complexity.
Solution Approach 2:
The cleaning function is merged with the existing drive wheel rotation. The brush bristles are positioned and configured to be driven by the natural rotation of the drive wheel, combining the propulsion function with the cleaning function in a single integrated system.
Data Source
AI summary
The present disclosure relates to a robotic lawn mower comprising a body, at least one pair of drive wheels, at least one swivelable wheel, at least one rotatable grass cutting disc, having a disc rotation axle that is adapted to rotate about a disc rotation axis, and at least one wheel brush device for each drive wheel. Each wheel brush device is arranged mainly between the respective drive wheel and at least one swivelable wheel and comprises holding means a plurality of brush bristles that are comprised in the respective wheel brush device and are adapted to bear on the respective drive wheel. The robotic lawn mower comprises a grass shield for each wheel brush device, each grass shield being arranged between the cutting disc and the respective brush bristles to prevent cut grass that is ejected from the cutting disc from adhering to the respective brush bristles.