Central Motor Layout for Electric Grass Cutting Machine
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Solution Overview
Problem
Existing electric grass cutting machines with electric motors for each wheel require high frequency usage and occupy large space, limiting the layout for a conveying duct and increasing costs.
Innovation Solution
The electric motor and gear transmission are positioned between the rear wheels in the front/rear direction, allowing for reduced motor usage and compact design, with the motor supported by a transmission case and oil cooling system, and the battery placed at the front to maintain balance and protect it from elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an electric motor is provided for each one of a pair of left and right wheels, then the driving performance is improved, but the frequency of use of the electric motor increases and the disposing space increases
Solution Approach 1:
The patent merges the driving function from individual wheel motors into a single central electric motor located in the hollow shaft of the rear wheel. This single motor drives both left and right rear wheels through a differential mechanism, reducing the number of motors from two to one, thereby decreasing the frequency of motor usage and simplifying the overall system structure while maintaining driving performance.
2Power
If an electric motor is provided for each one of a pair of left and right wheels, then the driving performance is improved, but the disposing space between left and right wheels increases
Solution Approach 1:
The patent consolidates the motor positioning into the hollow shaft of the rear wheel, merging what would have been two separate motor locations into a single centralized position. This eliminates the need for large spaces between left and right wheels that would be required to accommodate two separate motors, thereby reducing the disposing space while maintaining the driving function.
Solution Approach 2:
The electric motor is nested within the hollow shaft structure of the rear wheel, utilizing the existing hollow space. This nesting approach allows the motor to be positioned compactly within the wheel assembly itself, rather than requiring additional space between the wheels, thus optimizing the use of available space.
3Productivity
If a conveying duct is laid out between left and right rear wheels, then the grass collection function is achieved, but the space for the electric motor is reduced
Solution Approach 1:
The electric motor is nested within the hollow shaft of the rear wheel, utilizing the internal hollow space of the wheel structure. This nesting allows the motor to be positioned without occupying the space between the wheels that is required for the conveying duct, thereby resolving the spatial conflict between motor placement and grass collection duct layout.
Solution Approach 2:
The motor positioning is moved from the horizontal space between wheels to the vertical dimension within the hollow shaft. This dimensional shift allows the conveying duct to occupy the horizontal space between wheels for effective grass collection, while the motor is positioned vertically within the wheel's hollow structure, eliminating spatial conflict.
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 reduces the frequency of motor usage, optimizes space usage, and allows for a more compact machine design while maintaining effective cooling and balance, thus lowering costs and improving operational efficiency.
Implementation Method 1
a gear transmission configured to speed-change an output from the electric motor and to transmit the speed-changed output to the traveling device
Implementation Method 2
an oil circulation circuit configured to supply oil in circulation to the cooling jacket
Implementation Method 3
a battery disposed in the front hood and configured to supply power to the electric motor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In an electric grass cutting machine relating to the present invention, an electric motor (2) for driving a travelling device having a pair of left and right front wheels (1F) and a pair of left and right rear wheels (1R) and a gear transmission for speed-changing output from the electric motor (2) and transmitting the resultant power to the travelling device are disposed between the left and right rear wheels (1R) and arranged one after the other in the front/rear direction at positions laterally of a conveying duct (44) for guiding cut grass pieces from a rear discharge type mower device to a grass collecting container (50) supported to a rear portion of a machine body frame (10).