Walk-Behind Working Machine Layout to Prevent Ground Lift-Off
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Solution Overview
Problem
Existing working machines tend to lift off the ground due to the force of their own weight, leading to reduced maneuverability and stability issues, particularly in walk-behind models where the working unit is not adequately supported by both the battery and electric motor weights.
Innovation Solution
The working machine configuration includes a transmitting unit with a jaw coupler and a body housing design that separates the battery, electric motor, and working unit in the up-down direction, ensuring both the battery and motor weights act on the working unit to prevent lifting off the ground, along with a fan system that directs air output away from the user and separates dust entry points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the working unit is disposed below the battery only, then the structure is simple, but the working unit may lift off from the ground due to insufficient weight
Solution Approach 1:
The patent combines the battery and electric motor weights to act together on the working unit. The electric motor is positioned above the working unit, and its weight is transmitted through the transmitting unit to the working unit, merging the weight effects of both the battery and motor to prevent lifting off.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking components in the up-down direction. The battery, electric motor, and working unit are arranged vertically, allowing the weights of the battery and motor to act in the same direction (downward) on the working unit, effectively using gravitational force in the vertical dimension to suppress lifting.
2Volume of moving object
If the battery and electric motor are positioned close together, then the device is compact, but the weights cannot be effectively distributed to suppress lifting
Solution Approach 1:
The patent segments the weight distribution function by separating the battery and electric motor into different vertical positions. The battery is positioned higher while the electric motor is positioned closer to the working unit, allowing each component's weight to be independently utilized to suppress lifting at different locations.
Solution Approach 2:
The transmitting unit acts as an intermediary that transmits the weight of the electric motor to the working unit. This mediator allows the motor weight to be effectively applied to the working unit even though the motor is positioned above it, enabling proper weight distribution without requiring the motor to be physically adjacent to the working unit.
3Device complexity
If the fan directs air output forward, then the structure is simple, but air may blow onto the user causing discomfort
Solution Approach 1:
The patent uses asymmetric airflow direction by directing the fan's air output laterally or rearward instead of forward. This asymmetric arrangement ensures that the air flow does not blow onto the user who operates the device from the front, eliminating the harmful effect while maintaining structural simplicity.
Solution Approach 2:
The patent converts the potentially harmful forward air flow into a beneficial lateral or rearward flow. By redirecting the air output away from the user, the fan's airflow becomes beneficial for cooling components or clearing debris without causing discomfort to the operator.
4Device complexity
If dust entry points are not separated, then the structure is simple, but dust and liquid may ingress into internal components
Solution Approach 1:
The patent segments the sealing system by providing separate dust-proof seals for different entry points. The dust-proof seal for the battery is positioned and configured independently from the dust-proof seal for the electric motor, allowing each seal to be optimized for its specific location and function, effectively preventing dust and liquid ingress.
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 configuration effectively suppresses the working unit from lifting off the ground, enhancing maneuverability and stability by distributing weight and directing airflow, while also improving plowing performance and reducing dust and liquid ingress.
Implementation Method 1
both of the force by the self-weight of the battery and a force by self-weight of the electric motor act on the working unit
Data Source
AI summary
A working machine may work by moving frontward on a ground. The working machine may include: a battery; an electric motor comprising a stator and a rotor and configured to be driven by electric power supplied from the battery; a working unit configured to work on the ground by being rotated about a rotary axis by the electric motor, the rotary axis being substantially parallel to a virtual ground perpendicular to an up-down direction; and a transmitting unit configured to transmit rotation of the electric motor to the working unit. When the working machine is viewed from a front side with the working machine being in a working posture, the battery, the electric motor, and the working unit may be separate from each other in the up-down direction and the working unit may be disposed below the battery and the electric motor.