Front-Wheel-Drive Robotic Lawnmower Funnel Guide for Long-Grass Cutting
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Solution Overview
Problem
Front wheel driven robotic lawnmowers face inefficiencies in cutting long grass due to the grass being bent by the motor housings before reaching the cutting disc, which can be exacerbated by increasing the wheel distance or diameter, affecting the mower's overall size.
Innovation Solution
A funnel-shaped grass guide is formed by the motor housings, guiding grass directly to the cutting disc without bending, and an adjustable cutting disc position allows for efficient cutting of long grass while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between drive wheel motors is increased or drive wheel diameter is increased to prevent grass bending, then cutting efficiency for long grass is improved, but the overall size of the mower increases significantly
Solution Approach 1:
The motor housing serves as an intermediary structure that guides grass from the front to the rear of the mower body. By designing the motor housing with a funnel-shaped internal geometry, it acts as a mediator to channel long grass smoothly toward the cutting disc, preventing bending without requiring increased wheel spacing or diameter.
Solution Approach 2:
The solution moves the grass guidance function from the horizontal plane (wheel spacing) to the vertical and longitudinal dimensions within the motor housing. The funnel-shaped internal structure creates a three-dimensional guidance path that effectively channels grass without increasing the mower's overall footprint.
2Productivity
If the motor housing is designed to guide grass directly to the cutting disc, then grass bending is reduced, but the motor housing structure becomes more complex
Solution Approach 1:
The motor housing performs multiple functions: it houses the drive motor, provides structural support, and simultaneously serves as a grass guide. By integrating the grass guidance function into the existing motor housing structure, the design avoids adding separate complex guidance components while still achieving effective grass channeling.
Solution Approach 2:
The grass guidance function is merged with the motor housing structure. The funnel-shaped internal geometry of the motor housing combines the motor enclosure with the grass channeling function, eliminating the need for separate guidance structures and reducing overall device complexity.
Data Source
AI summary
A front wheel driven robotic lawnmower is adapted to run in a forward running direction, the robotic lawnmower comprising a main body part, a plurality of wheels, a rotatable cutting disc that is driven by a cutter motor, and a control unit. At least two front drive wheels are drivably connected to a corresponding electric drive wheel motor that at least partly is contained in a respective motor housing. A corresponding frontmost part of the motor housings in the forward running direction define a front grass receiving opening, and a corresponding rearmost part of the motor housings in the forward running direction define a rear grass receiving opening. A shortest rear distance between the rearmost parts falls below a shortest front distance between the frontmost parts such that corresponding housing wall parts connecting the frontmost parts and the rearmost part form a funnel-shaped grass guide.