Offset Final Transmission for Low-Profile Vehicles
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Solution Overview
Problem
Existing final transmission systems for industrial and agricultural vehicles are ineffective in vehicles with restricted vertical dimensions, particularly in orchards and vineyards, where a low motor position is required, leading to inadequate traction due to small wheel sizes and excessive loads on bearings.
Innovation Solution
A final transmission system with a structure that allows for the use of larger wheels by offsetting the output shaft and using a planetary gear train with a toothed output wheel, intermediate wheel, and support wheel, which distributes torque and reduces bearing loads, enabling flexible positioning and reduced bearing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the motor is positioned in the lowest possible position to reduce vertical dimensions, then the vertical dimensions of the vehicle are reduced, but small wheels must be used which provide poor traction
Solution Approach 1:
The patent introduces a non-coaxial arrangement where the output shaft is offset from the axis of the driving wheels, creating a dimensional transformation that allows power transmission from a low-positioned motor to larger-diameter wheels. This spatial reconfiguration enables the motor to remain in the lowest possible position while still driving wheels of optimal size for traction.
Solution Approach 2:
The patent employs an intermediate transmission mechanism comprising a toothed output wheel on the offset shaft that engages with the driving wheels. This intermediary gear system acts as a mediator between the low-positioned output shaft and the larger driving wheels, enabling power transmission while maintaining both the low motor position and large wheel diameter for adequate traction.
2Length of stationary object
If small wheels are used to accommodate low motor positioning, then vertical dimensions are reduced, but the power output of the motor cannot be fully utilized
Solution Approach 1:
By offsetting the output shaft from the wheel axis and using a different dimensional configuration rather than coaxial alignment, the system enables larger wheels to be used despite the low motor position. This allows the full power output of the motor to be transmitted through the intermediate gear mechanism to the larger wheels, maximizing traction and power utilization.
3Length of moving object
If the output shaft is offset from the axis of the driving wheels, then larger wheels can be used, but the structure becomes more complex
Solution Approach 1:
The patent segments the transmission system into distinct functional components: an offset output shaft, an intermediate toothed gear wheel, and the driving wheels. This segmentation allows each component to be optimized independently and simplifies the overall design by breaking down the complex non-coaxial power transmission into manageable, modular elements that are easier to manufacture and maintain.
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
Enables optimal performance in vehicles with reduced vertical dimensions while maintaining traction and reducing the size and material usage of transmission components, allowing for efficient power delivery and flexible torque orientation.
Implementation Method 1
a planetary gear train with a toothed output wheel, intermediate wheel, and support wheel, which distributes torque
Implementation Method 2
a toothed output wheel, intermediate wheel, and support wheel, which distributes torque
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A final transmission for agricultural and industrial motor vehicles comprises a differential unit comprising a support structure and a differential that transmits an input motion to an intermediate transmission shaft and a transfer unit comprising a final shaft that transmits the motion to the driving wheel. The final transmission further comprises a toothed output wheel integral to the intermediate transmission shaft which engages respectively with an internally toothed crown wheel and with an intermediate toothed wheel, and further comprises at least one toothed support wheel which engages with the internally toothed crown wheel and with the intermediate toothed wheel.