Wheel-Integrated Speed Reducer for Narrow Garden Tool Drive Layouts
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Solution Overview
Problem
Existing garden tools face challenges in reducing the lateral size of their driving mechanisms while meeting power requirements, particularly when navigating through narrow spaces like fence doors, and existing motor-driven wheel configurations are limited by size and power.
Innovation Solution
A garden tools travel driving mechanism featuring traveling wheels, a driving motor, and a speed reducer arranged in the axial center of the wheels, where the speed reducer increases torque and reduces the overall width by utilizing a planetary gear mechanism that can be hidden within the wheels, enhancing space utilization and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a parallel shaft gear box and motor are used to drive the garden tool, then the power requirement can be met, but the occupied space is large and the lateral size increases
Solution Approach 1:
The patent places the speed reducer inside the axial space of the traveling wheels, nesting the driving mechanism within the wheel structure. This allows the gear box to be positioned concentrically with the wheels, utilizing the hollow interior space rather than occupying additional lateral area, thereby reducing the overall lateral size while maintaining power transmission capability
Solution Approach 2:
The patent transitions from a lateral arrangement of components to an axial arrangement by positioning the speed reducer along the axial direction of the wheels. This dimensional change allows the mechanism to fit within the wheel's axial space rather than extending laterally, solving the contradiction between power transmission needs and lateral size constraints
2Area of stationary object
If the speed reducer is arranged in the axial space of the traveling wheels, then the lateral size is reduced, but the arrangement complexity increases
Solution Approach 1:
The traveling wheels serve multiple functions: they provide propulsion, support the weight of the garden tool, and simultaneously house the speed reducer within their axial space. This multi-functionality reduces the need for separate structural components for mounting the reducer, thereby limiting the increase in arrangement complexity despite the compact integration
Solution Approach 2:
The patent merges the function of the wheel structure with the mounting structure for the speed reducer. The wheel's axial space is utilized to accommodate the reducer, combining what would traditionally be separate components into an integrated assembly, which simplifies the overall structure despite the compact arrangement
3Area of stationary object
If a directly driven wheel configuration is used to save space, then the lateral size is reduced, but the motor power is limited by the wheel size
Solution Approach 1:
By nesting the speed reducer within the wheel's axial space, the patent enables the use of a larger motor without increasing lateral dimensions. The reducer acts as an intermediary that allows the motor to be positioned centrally within the wheel structure, transmitting power through the wheel hub rather than requiring the motor to be mounted on the wheel periphery, thus overcoming the power limitation of direct-drive configurations
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 overall transverse width of the mower, improves motion flexibility, and ensures sufficient power while minimizing the size of the driving motor, allowing for easier passage through narrow spaces and enhanced operational stability.
Implementation Method 1
the speed reducer is a planetary reducer... a first sun gear arranged on the mandrel... a first plurality of planet wheels... the first plurality of planet wheels are engaged with the first sun wheel
Data Source
AI summary
The present invention belongs to the technical field of garden tools, and particularly relates to a garden tools travel driving mechanism and garden tools, the garden tools travel driving mechanism comprises: traveling wheels; a driving motor; and a speed reducer, the power input end of the speed reducer is connected with the driving motor, the power output end of the speed reducer is connected with the traveling wheels, and the speed reducer is arranged in an axial space at the center of the traveling wheels. The speed reducer can increase the output torque of the driving motor, so that the power and the size of the driving motor can be reduced on the premise of ensuring sufficient power. Meanwhile, the speed reducer is arranged in the central axial space of the traveling wheels and is used as a supporting shaft of the traveling wheels. The space utilization rate is improved, the overall transverse width of the mower is reduced, and the mower has a better motion flexibility on the premise of meeting the design requirement of the power.