Riding Lawn Mower Pedal Assembly for Quick Speed Control
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Solution Overview
Problem
Existing riding lawn mowers lack a robust and quick control mechanism for the walking process, which affects the driving experience and efficiency.
Innovation Solution
A pedal assembly with a pedal lever and position sensor that maps angular positions to target rotational speeds of walking motors, providing stronger and quicker control over the riding lawn mower's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rider is positioned on the lawn mower to apply downward force on the cutting deck, then the cutting ability is improved, but the stability of the lawn mower is worsened due to the high center of gravity
Solution Approach 1:
The lawn mower is divided into separate functional modules: the cutting deck assembly can be independently adjusted and removed, allowing the cutting height to be modified without affecting the overall stability of the mower body. This segmentation enables the cutting deck to be positioned lower relative to the rider, improving stability while maintaining cutting performance.
Solution Approach 2:
The cutting height adjustment mechanism introduces a vertical dimension of adjustment, allowing the cutting deck to be positioned at different heights relative to the rider. By lowering the cutting deck position in the vertical dimension, the center of gravity is reduced, improving stability while maintaining adequate cutting ability through height adjustment.
2Stability of the object's composition
If the cutting deck is positioned at a low position relative to the rider, then the stability is improved, but the cutting ability is worsened due to insufficient downward force
Solution Approach 1:
The cutting deck height is made dynamically adjustable rather than fixed. The adjustable height mechanism allows the cutting deck position to be changed based on operational requirements, enabling the system to optimize between stability (lower position) and cutting ability (higher position with more downward force) as needed.
Solution Approach 2:
The cutting height parameter can be modified to change the position of the cutting deck relative to the rider. By adjusting this parameter, the system can achieve different balances between stability and cutting performance, allowing optimization for specific operating conditions without being constrained by a fixed design.
3Ease of operation
If the lawn mower is disassembled into multiple parts for transport, then the ease of transport is improved, but the device complexity is worsened
Solution Approach 1:
The lawn mower is designed as a segmented system with modular components including the cutting deck assembly, seat assembly, and main body that can be independently separated. This segmentation enables easy disassembly for transport while maintaining relatively simple individual components that are straightforward to reassemble, balancing transport ease with device complexity.
Solution Approach 2:
The cutting deck assembly and other components are designed to nest within or attach to the main body of the lawn mower when not in use. This nesting arrangement allows the mower to be stored in a compact form while still enabling easy disassembly when transport is needed, reducing the practical complexity of handling multiple separate parts.
Data Source
Figure 1
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AI summary
A riding lawn mower (100) includes a seat (15), a chassis (16), a wheel (121, 122), a motor (123) configured to drive the wheel (121, 122) to rotate, a walking control module (124) configured to drive the motor (123), a power supply assembly (14) configured to at least supply electric power to the motor (123) and the walking control module (124), a cutting assembly (11) mounted to the chassis (16), and a pedal assembly (131) including a pedal lever (1312) rotatable about a first shaft axis (101) to control a walking speed of the riding lawn mower (100) when operated by the user. When the pedal lever (1312) is in an initial position and the power supply assembly (14) is supplying electric power to the motor (123) and the walking control module (124), the walking control module (124) controls the riding lawn mower (100) to park. The pedal assembly (131) provides a stronger and quicker control of the walking process of the riding lawn mower (100).