Planetary Transmission Layout for Equal Dual Torque Output
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Solution Overview
Problem
Existing vehicle transmissions lack improved power density and efficiency, particularly in generating approximately equal-sized output torques greater than the input torque, while also requiring a compact design.
Innovation Solution
A transmission system utilizing three planetary gear sets with specific rotational fixings and connections, including a prime mover, input and output shafts, and coupling shafts, allowing for efficient torque conversion and differential function, with optional nested gear sets for compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional transmission designs are used, then the structure is simpler, but the power density and efficiency are insufficient to generate equal-sized output torques greater than input torque
Solution Approach 1:
The patent employs nested planetary gear sets where smaller planetary gear sets are positioned within or alongside larger ones, sharing common shafts and spatial volume. This nesting arrangement enables multiple torque multiplication paths within a compact structure, allowing the generation of equal-sized output torques greater than input torque while controlling overall device complexity.
Solution Approach 2:
The patent transitions from conventional single-dimension linear power flow to multi-dimensional torque distribution through the planetary gear sets. By arranging planetary gear sets in a configuration that utilizes radial and axial dimensions simultaneously, the system achieves torque multiplication in multiple directions, enabling equal-sized output torques from a single input source.
2Volume of moving object
If the transmission system is made more compact, then the power density improves, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple planetary gear sets into a single integrated transmission unit, sharing common shafts (input shaft, output shaft, coupling shafts) and housing space. This consolidation reduces the overall transmission volume while the modular planetary gear module design maintains manufacturing feasibility by using repeated, standardized components.
Solution Approach 2:
The planetary gear sets serve multiple functions simultaneously: torque multiplication, differential torque distribution between output shafts, and compact space utilization. This multi-functionality reduces the need for separate components, simplifying manufacturing while achieving high power density in a reduced volume.
3Productivity
If conventional single output transmission is used, then the device complexity is lower, but the efficiency and power density are insufficient
Solution Approach 1:
The patent segments the power transmission path into multiple parallel planetary gear sets, each contributing to the overall torque output. This segmentation allows independent optimization of each gear set while collectively achieving high power density through combined output, with each segment handling a portion of the torque multiplication task.
Solution Approach 2:
The planetary gear sets perform preliminary torque multiplication before final power delivery, with each gear set pre-processing the input torque to contribute to the equal-sized output torques. This preliminary action within each gear set enables the system to achieve high power density through cumulative torque multiplication across multiple parallel paths.
Data Source
AI summary
A transmission for a motor vehicle includes a first, a second, and a third planetary gear set, an input shaft, a first and a second output shaft, and a first and a second coupling shaft. Respective elements of the first planetary gear set are rotationally fixed to the input shaft, rotationally fixed to the first coupling shaft, and rotationally fixed to the second coupling shaft. Respective elements of the second planetary gear set are rotationally fixed to the first coupling shaft, rotationally fixed to a stationary component, and rotationally fixed to the second output shaft. Respective elements of the third planetary gear set are rotationally fixed to the second coupling shaft, rotationally fixed to the first output shaft, and rotationally fixed to the second output shaft.