Walk-Behind Outdoor Power Machine with Variable Blade and Wheel Control
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Solution Overview
Problem
Existing outdoor power machines, particularly walk-behind mowers, lack improved performance in cutting efficiency, drive flexibility, and control capabilities.
Innovation Solution
A self-propelled walk-behind outdoor power machine with a chassis, handle assembly, rear and front wheels, an electrical power pack, and a deck assembly equipped with blade motors and a control system that allows for forward and reverse movement, independent wheel speed control, and variable blade speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single blade motor is used, then the device complexity is reduced, but the cutting efficiency and blade speed control flexibility deteriorate
Solution Approach 1:
The single blade motor is divided into two separate blade motors, one for each blade. This segmentation allows independent control of each blade's speed and operation, enabling differentiated cutting speeds for different blade types (e.g., cutting blade vs. mulching blade) while maintaining manageable system complexity through modular design
2Device complexity
If fixed wheel speed control is used, then the device complexity is reduced, but the drive flexibility and maneuverability deteriorate
Solution Approach 1:
The wheel speed control system transitions from fixed to dynamic/variable speed control. Each drive hub can independently adjust its wheel speed through motor control, enabling the system to adapt to varying terrain conditions, slopes, and maneuvering requirements. This dynamic control allows optimal performance across different operating scenarios while maintaining reasonable system complexity through electronic control
3Ease of operation
If simple blade operation control is used, then the ease of operation is improved, but the control capabilities and precision deteriorate
Solution Approach 1:
The blade motor control system incorporates feedback mechanisms that allow the operator to precisely control blade speed through controls on the handle assembly. The system provides feedback to the operator about blade operation status and speed, enabling precise adjustment while maintaining ease of operation through intuitive control interfaces. This feedback loop allows for both simple operation and precise control as needed
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
Enhances cutting efficiency, provides flexible maneuverability, and improves user control over the machine's operations, including speed and blade operation, ensuring stable operation on inclines and slopes.
Implementation Method 1
an electrical power pack configured to supply electric energy to the drive hub
Implementation Method 2
at least one blade motor mounted to the top panel of the deck; and at least one blade rotatably mounted to the blade motor
Data Source
AI summary
A walk-behind outdoor power machine includes a chassis; a handle assembly pivotally connected to the chassis; spaced-apart first and second rear wheels connected to the chassis, each of the first and second rear wheels being coupled to a drive hub; spaced-apart first and second front wheels connected to the chassis; an electrical power pack configured to supply electric energy to the drive hub; a deck assembly mounted to the chassis, the deck assembly including: a deck defining an open-bottomed housing, including a top panel and a peripheral wall structure; at least one blade motor mounted to the top panel of the deck; and at least one blade rotatably mounted to the blade motor.