Radial Motor-Generator Layout for Compact Hybrid Power Transmission
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Solution Overview
Problem
Existing power systems in hybrid vehicles face an increase in axial size due to the coaxial arrangement of the engine and motor generator, which complicates mounting and space requirements.
Innovation Solution
A power transmission unit with a motor generator disposed outward in the radial direction from the input shaft, utilizing a one-way clutch and relay mechanism to minimize axial size, allowing for compact hybrid power systems without increasing space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor generator is disposed coaxially with the engine, then power transmission efficiency is improved, but the axial size of the power system increases
Solution Approach 1:
The patent transitions from a coaxial arrangement (one-dimensional alignment) to a radial arrangement where the motor generator is positioned outward from the input shaft in the radial direction. This dimensional change allows the motor generator to be integrated into the existing engine compartment without increasing axial size, while maintaining power transmission efficiency through the relay mechanism and one-way clutch
2Adaptability or versatility
If the motor generator is added to the power system, then hybrid power capability is achieved, but the space required for mounting increases
Solution Approach 1:
The patent merges the motor generator with the existing engine power transmission system by positioning it radially outward from the input shaft. The one-way clutch and relay mechanism enable the motor generator to be integrated into the existing engine compartment space, allowing hybrid power capability without requiring additional mounting space beyond what is already available in conventional engine compartments
3Loss of energy
If a one-way clutch is used to disconnect driving force, then energy loss is reduced, but device complexity increases
Solution Approach 1:
The one-way clutch is configured to automatically engage and disengage based on the rotational direction and driving force conditions without requiring external control mechanisms. When the rotary shaft or output shaft generates driving force to rotate the input shaft in the other direction, the one-way clutch automatically disconnects the driving force, reducing energy loss without adding complex control systems
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
The configuration minimizes axial size, enabling hybrid power systems to be mounted in existing engine compartments without additional space, reduces energy loss, and maintains power transmission reliability.
Implementation Method 1
a one-way clutch configured to transmit a driving force of the input shaft in one direction to the rotary shaft and the output shaft via the relay mechanism and disconnect a driving force between the relay mechanism and the input shaft
Data Source
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AI summary
What is provided is a power transmission unit and a power system according to one aspect of the present disclosure, including: an input shaft connected to a drive shaft of an internal combustion engine; an output shaft connected to a driven apparatus in a power transmittable manner; a transmission mechanism connecting the input shaft to the output shaft; and a motor generator including a rotary shaft connected to the input shaft and the output shaft via the transmission mechanism. When viewed in an axial direction of the input shaft, the motor generator is disposed outward from the input shaft in a radial direction crossing the axial direction.