Robot Lawnmower Edge Blade Layout for Single-Pass Rim Cutting
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Solution Overview
Problem
Conventional robot lawn mowers require multiple passes to cut grass on both sides of a main cut region, increasing working time and potentially compromising user safety due to the need for separate trimming and larger cut region diameters.
Innovation Solution
A robot lawnmower design featuring a body frame with a main wheel, a first edge blade with a ring gear, and a second edge blade along the main wheel's rim, both rotating in opposite directions to simultaneously cut grass on both sides of the main region, utilizing a planetary gear system for efficient edge cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the diameter of the cut region is increased to reduce the number of round trips, then the productivity is improved, but the safety risk increases for the user
Solution Approach 1:
The cutting system is segmented into a main blade for central cutting and edge blades for rim region cutting. This segmentation allows the lawnmower to cut both the main region and rim regions simultaneously without increasing the diameter of the main cut region, thereby maintaining safety while improving productivity.
Solution Approach 2:
The cutting function is extended from a single central blade to multiple blades including edge blades positioned at the rim regions. This dimensional extension allows simultaneous cutting in multiple zones (central and rim) without increasing the overall safety risk associated with a larger single cut region diameter.
2Productivity
If a single main blade is used to cut grass, then the device complexity is reduced, but the productivity decreases due to multiple round trips required
Solution Approach 1:
The single main blade is segmented into multiple cutting elements: a main blade for central cutting and edge blades for rim region cutting. This segmentation enables simultaneous cutting in multiple zones, reducing the number of round trips and working time, while the modular structure keeps the added complexity manageable.
Solution Approach 2:
The blade system is designed with multi-functionality where the main blade handles central region cutting and the edge blades handle rim region cutting. This universal cutting capability allows a single pass to cover both main and rim regions, improving productivity without requiring entirely separate trimming systems.
3Productivity
If separate trimming is performed for rim regions, then the manufacturing precision of cutting is improved, but the loss of time increases
Solution Approach 1:
The main cutting operation and rim region trimming are merged into a single simultaneous operation. The main blade and edge blades work together in one pass to cut both the main region and rim regions, eliminating the time loss from separate trimming while maintaining cut quality through the specialized edge blade design.
Solution Approach 2:
The cutting action is made continuous by having both the main blade and edge blades operate simultaneously during a single pass. This eliminates the interruption and time loss associated with separate trimming operations, while the continuous cutting action maintains precision through consistent blade engagement with the grass.
Data Source
AI summary
Disclosed is a robot lawnmower including a body frame, a main wheel disposed on both sides of the body frame, a motor to drive the main wheel, a first edge blade provided in a region of the body frame corresponding to the main wheel and coupled to be rotatable with respect to the body frame by receiving a driving force of the motor, and a second edge blade disposed between the body frame and the main wheel to rotate together with the main wheel and cut a grass by a relative rotation of the first edge blade and the main wheel.