Grass Mower Power Transmission Lateral Motor Placement
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Solution Overview
Problem
Conventional grass mower machines face challenges in securing a sufficient lift stroke for the mower deck due to the space constraints caused by the placement of electric motors and gear mechanisms, which limits the ground height and increases the center of gravity of the machine body.
Innovation Solution
The design positions the electric motor on the outer side of the cutter blade rotation paths, with power transmission using belts or chains that extend above the mower deck, allowing for a more lateral placement of the motor and reducing interference with the machine body, thereby creating space for a larger lift stroke. This configuration includes multiple rotation shafts with overlapping cutter blade paths to achieve a wider cutting width without leaving leftovers and ensures that power distributors are smaller, allowing for a greater lift stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor and bevel gear are disposed above the rotation shaft to transmit power to the cutter blade, then the power transmission is achieved, but the space above the mower deck top wall is largely occupied, making it difficult to secure a sufficient ground height for the mower deck
Solution Approach 1:
The patent repositions the electric motor from a vertical arrangement (above the rotation shaft) to a lateral arrangement (beside the rotation shaft). The motor's output shaft extends laterally to engage the bevel gear, changing the spatial dimension of power transmission from vertical to horizontal. This dimensional shift frees up the vertical space above the mower deck, allowing for increased ground height and sufficient lift stroke while maintaining effective power transmission to the cutter blade.
Solution Approach 2:
The bevel gear acts as an intermediary element that bridges the lateral output shaft of the electric motor and the vertical rotation shaft of the cutter blade. By introducing this intermediate power transmission component, the system enables efficient power transfer between non-collinear shafts, allowing the motor to be positioned laterally while still driving the vertically oriented cutter blade effectively.
2Length of stationary object
If the height of the machine body is increased to secure a sufficient ground height (lift stroke) for the mower deck, then the lift stroke is sufficient, but the center of gravity of the machine body is elevated, causing inconvenience
Solution Approach 1:
The patent resolves this contradiction by changing the spatial arrangement of the power transmission components from a vertical configuration to a lateral configuration. By positioning the electric motor beside rather than above the rotation shaft, the vertical space above the mower deck is freed up. This allows the mower deck to achieve sufficient ground height and lift stroke without requiring an increased machine body height, thereby maintaining a lower center of gravity and improved stability.
3Device complexity
If cutter blade driving devices such as gear mechanism and electric motor are disposed upwardly of the rotation shaft, then the power transmission structure is compact, but it is difficult to secure a sufficient space between the mower deck and machine body frame for sufficient lift stroke
Solution Approach 1:
The patent maintains structural compactness by using the efficient bevel gear mechanism for power transmission, but repositions the entire power transmission assembly from a vertical arrangement to a lateral arrangement. The electric motor is positioned beside the rotation shaft with its output shaft extending horizontally to engage the bevel gear. This dimensional reconfiguration preserves the compactness of the power transmission components while freeing up the vertical space between the mower deck and machine body frame, enabling sufficient lift stroke.
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 arrangement allows for a more substantial lift stroke of the mower deck, reducing interference with the machine body and enhancing the cutting width while maintaining efficient power transmission, thus addressing the space constraints and stability issues of previous designs.
Implementation Method 1
a belt that extends above the top wall of the mower deck and that transmits power from the output shaft to the first rotation shaft
Implementation Method 2
a second belt that extends above the top wall of the mower deck and that transmits power from the first rotation shaft to the second rotation shaft
Data Source
AI summary
A grass mower machine includes a mower deck 30 that protrudes from a frame unit in a machine body transverse direction, cutter blades 20 attached respectively to a first rotation shaft 21, a second rotation shaft 22 and a third rotation shaft 23 that are disposed side by side and spaced apart from each other in the machine body transverse direction, a first power transmitting body 71 for transmitting power from an output shaft 41 of an electric motor 4 which is disposed on an outer side of rotation paths of the cutter blades 20 as seen in a plane view to the first rotation shaft 21, a second power transmitting body 72 for transmitting power from the first rotation shaft 21 to the second rotation shaft 22, and a third power transmitting body 73 for transmitting power from the second rotation shaft 22 to the third rotation shaft 23.