Walk-Behind Mower AWD Switching With a Single Actuator
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Solution Overview
Problem
Existing walk-behind lawn mowers require multiple actuators to switch between all-wheel drive and two-wheel drive modes, making the process cumbersome and requiring tools or complicated modifications.
Innovation Solution
A drive system with a single actuator that selectively engages a first or second transmission via a flexible driving member, allowing for easy switching between two-wheel and all-wheel drive operations using a single mechanism, such as a single drive belt or dual belt system, and incorporating adjustable idler pulleys or a change-speed gear for belt tensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple actuators are used to switch between all-wheel drive and two-wheel drive modes, then the drive mode switching capability is achieved, but the device complexity and ease of operation deteriorate
Solution Approach 1:
The patent combines multiple actuator functions into a single actuator that can selectively engage either the first transmission (for two-wheel drive) or the second transmission (for all-wheel drive). This single actuator replaces what would traditionally require multiple separate actuators, thereby reducing device complexity while maintaining the capability to switch between drive modes.
Solution Approach 2:
The single actuator is designed with multi-functionality to perform both two-wheel drive engagement and all-wheel drive engagement through selective connection to different transmissions. This universal actuator eliminates the need for separate actuators for different drive modes, simplifying the overall system while preserving adaptability.
2Adaptability or versatility
If multiple actuators are used to switch between drive modes, then the drive mode switching capability is achieved, but the ease of operation deteriorates
Solution Approach 1:
By merging multiple actuator operations into a single actuator, the patent reduces the number of manual operations required from the operator. Instead of manipulating multiple actuators to switch between drive modes, the operator only needs to operate one actuator, significantly improving ease of operation and user convenience.
3Device complexity
If a single actuator is used to switch between drive modes, then the device complexity is reduced, but the reliability of drive mode engagement may deteriorate
Solution Approach 1:
The patent segments the transmission system into distinct first and second transmissions, each dedicated to a specific drive mode. The single actuator selectively engages one transmission or the other through discrete engagement points, ensuring clear separation of functions. This segmentation prevents interference between drive modes and ensures reliable engagement of the selected mode.
Solution Approach 2:
The single actuator serves as an intermediary component that mediates between the power source and the two different transmissions. Through this intermediary role, the actuator can reliably select and engage the appropriate transmission for the desired drive mode, maintaining engagement reliability despite the reduction in actuator quantity.
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
Enables operators to effortlessly switch between drive modes without tools, enhancing operational convenience and reducing complexity, while maintaining traction and mobility in various terrains.
Implementation Method 1
The at least one flexible driving member selectively engages one of the first transmission or the second transmission to switch the walk-behind outdoor power equipment device between two-wheel drive operation and all wheel drive operation
Data Source
AI summary
A drive system includes a first transmission, a second transmission and at least one flexible driving member. The first transmission is operably coupled to a first set of wheels to provide drive power to the first set of wheels responsive to engagement of the first transmission. The second transmission is operably coupled to a second set of wheels to provide drive power to the second set of wheels responsive to engagement of the second transmission. The at least one flexible driving member is operably coupled to a remote actuator and a drive shaft of the walk-behind outdoor power equipment device. The at least one flexible member selectively engages one of the first transmission or the second transmission to switch a walk-behind outdoor power equipment device between all wheel drive operation and another drive mode via the remote actuator.