Split Traction Drum Steering for Walk-Behind Greens Mower
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Solution Overview
Problem
Existing electric walk behind greens mowers lack maneuverability, require operator presence for edge clean-up passes, and have issues with size, weight, and battery cost, while also risking damage to the green during turns and being time-consuming to operate.
Innovation Solution
The electric walk behind greens mower features split traction drums driven by independent electric motors, controlled by dual levers and an electronic controller, enabling enhanced steering, automated clean-up passes, and easy battery replacement, with sensors for proximity and obstacle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional single traction drive system is used, then device complexity is reduced, but maneuverability and steering capability deteriorate
Solution Approach 1:
The single traction drive system is segmented into two independent electric motors, one for each traction roller. This allows independent control of left and right rollers, enabling superior maneuverability and steering capability while maintaining reasonable system complexity through modular architecture
2Productivity
If automated clean-up pass system is implemented, then operator time is reduced, but device complexity increases
Solution Approach 1:
The mower is equipped with sensors that automatically detect the green edge and enable the clean-up pass function without continuous operator intervention. The system serves itself by autonomously navigating and mowing along the green perimeter, reducing operator time while managing complexity through automated detection and control
3Power
If high power motors are used, then cutting performance is improved, but size and weight increase
Solution Approach 1:
The power source (battery) is extracted as a separate, removable module from the main mower body. This allows the use of high-capacity batteries needed for powerful motors without permanently increasing the mower's operational weight, and enables easy battery replacement to manage weight and cost
4Duration of action of moving object
If expensive high-capacity battery is used, then runtime is improved, but cost increases
Solution Approach 1:
The battery is designed as a disposable or replaceable component rather than a permanent integrated part. Users can discard depleted batteries and replace them with charged ones, or return depleted batteries for recharging/recycling. This approach enables the use of high-capacity batteries for extended runtime while managing cost through replacement rather than permanent investment
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
This design improves maneuverability, reduces operator time, minimizes green damage, and allows for automated edge mowing, while reducing the mower's size, weight, and battery costs, and simplifying battery handling.
Implementation Method 1
sensors for proximity and obstacle detection
Data Source
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AI summary
An electric walk behind greens mower (100) having a traction drum split into a first half (102) and a second half (104), each half rotatable at a different speed to provide traction drive and steering for the mower (100) in response to actuation of hand controls (110, 112) by an operator, or in response to commands from an electronic controller (120) based on the signals from a proximity sensor (132) on the mower. The electric walk behind greens mower (100) includes a pair of electric traction drive motors (106, 108), one of the electric traction drive motors (106, 108) rotating each half of the split traction drum (102, 104).