Coaxial Dual-Path Transmission for Higher Second-Motor Torque
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Solution Overview
Problem
Existing power transmission devices cannot effectively increase the torque output from a second motor to an output shaft due to gear ratio limitations.
Innovation Solution
A power transmission device design where the first and second input shafts are disposed on the same axis, with a first speed reduction mechanism and a second speed reduction mechanism having different ratios, and a one-way clutch interposed between the gear and intermediate shaft to manage power transmission, allowing the second motor to increase its torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the second motor is coupled to an intermediate shaft and transmits rotation via the second gear train, then the power transmission structure is established, but the torque that the second motor outputs to the output shaft cannot be increased due to gear ratio limitations
Solution Approach 1:
The power transmission system is segmented into two independent paths: a first speed reduction mechanism for the first motor and a second speed reduction mechanism for the second motor. This segmentation allows each motor to have its own optimized gear ratio, enabling the second motor to achieve higher torque output without being constrained by the gear ratios required for the first motor.
Solution Approach 2:
The patent introduces a dual-path power transmission architecture where the first and second input shafts are disposed on the same axis but transmit power through separate speed reduction mechanisms. This dimensional reorganization allows independent optimization of torque and speed characteristics for each motor, resolving the torque limitation imposed by single-gear-train configurations.
2Reliability
If a one-way clutch is interposed between the gear and intermediate shaft to manage power transmission, then clutch durability is improved by reducing lubrication failure, but the device complexity increases
Solution Approach 1:
A one-way clutch is introduced as an intermediary element between the gear and the intermediate shaft. This clutch selectively transmits torque in one direction while allowing reverse rotation, which protects the clutch from lubrication failure by preventing adverse rotational forces. The one-way clutch acts as a protective mediator that enhances reliability without requiring complex control mechanisms.
3Force
If the first and second input shafts are disposed on the same axis with different speed reduction mechanisms, then the torque output from the second motor is increased, but the structural complexity increases
Solution Approach 1:
The common axis structure serves multiple functions: it supports both the first and second input shafts, accommodates two different speed reduction mechanisms, and enables independent torque optimization for each motor. This universal structural arrangement allows the system to achieve high torque output from the second motor while maintaining a compact and integrated design.
Data Source
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AI summary
Provided is a power transmission device that can increase a torque that a second motor outputs to an output shaft. The power transmission device includes: a first input shaft and a second input shaft coupled to a first motor and a second motor, respectively, and disposed on the same axis; a first speed reduction mechanism transmitting a rotation of the first input shaft to an output shaft via an intermediate shaft; a second speed reduction mechanism transmitting a rotation of the second input shaft to the output shaft via the intermediate shaft at a speed reduction ratio different from the speed reduction ratio of the first speed reduction mechanism; and a first clutch disconnecting or connecting the power of the first speed reduction mechanism.