Rolling-Element Shaft Coupling for Low-Friction Torque Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power transmission solutions, such as splined couplings, experience significant energy losses and vibration issues due to friction when transmitting large torques between rotating shafts, leading to inefficiency and potential system degradation in turbomachines.
Innovation Solution
A coupling assembly featuring rolling elements and an annular cage with axial grooves and recesses, allowing torque transmission while minimizing friction through rolling contact, thereby enabling efficient power transfer and maintaining vibration behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If splined couplings are used to transmit large torques between shafts, then torque transmission capability is improved, but friction losses increase significantly
Solution Approach 1:
The patent replaces the conventional splined coupling mechanical contact system with a magnetic coupling system that uses magnetic fields to transmit torque. The magnetic coupling device includes a first magnetic coupling element on one shaft and a second magnetic coupling element on the other shaft, eliminating direct mechanical contact and associated friction losses while maintaining torque transmission capability.
2Power
If splined couplings are used to transmit large torques, then torque transmission is improved, but relative axial movement between shafts is prevented
Solution Approach 1:
The magnetic coupling system replaces mechanical interlocking with magnetic field interaction, allowing the shafts to maintain relative axial movement freedom while still transmitting torque effectively. The magnetic coupling elements can accommodate axial displacement without preventing the relative movement between shafts.
3Power
If conventional mechanical connections are used, then torque transmission is achieved, but vibration behavior deteriorates due to friction
Solution Approach 1:
The patent replaces friction-based mechanical contact with non-contact magnetic coupling, eliminating the variable friction forces that cause vibration and alter system stiffness. This results in more predictable vibration behavior and improved reliability under large vibration loads.
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 solution significantly reduces energy losses and maintains system vibration stability, enhancing the reliability and lifespan of mechanical connections in turbomachines by minimizing friction and avoiding direct contact between shafts.
Implementation Method 1
A coupling assembly featuring rolling elements and an annular cage with axial grooves and recesses, allowing torque transmission while minimizing friction through rolling contact
Data Source
AI summary
A turbomachine includes a low-pressure shaft that drives a fan shaft in rotation by a coupling assembly including a first shaft on which are formed plural first axial grooves, a second shaft on which are formed plural second axial grooves, and a coupling device including rolling elements and an annular cage positioned between the first shaft and the second shaft. The rolling elements are positioned between one of the first axial grooves and one of the second axial grooves to couple in rotation the first and the second shaft. Each first and second groove has a first and a second substantially planar surface inclined with respect to one another and extending along the axis.