Composite Drive Shaft With Undulated Diaphragms for High Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drive shafts face challenges in efficiently transmitting high torque at high speeds while minimizing weight and maintaining structural integrity under varying load conditions, particularly in aerospace applications where flexibility and torsional stiffness are crucial.
Innovation Solution
A drive shaft formed from fiber-reinforced polymer matrix composites with radially undulated diaphragm members and a connecting tubular portion, where the diaphragms and tube are separately fabricated and connected using mechanical joints, allowing for enhanced flexibility and torsional stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If drive shafts are formed entirely from metallic materials, then structural integrity and torque transmission are achieved, but weight is excessive
Solution Approach 1:
The drive shaft is constructed using composite materials consisting of fiber reinforcement embedded in a polymer matrix, replacing traditional metallic materials. This composite structure provides both the necessary structural integrity for torque transmission and significant weight reduction, directly resolving the contradiction between weight and strength
2Ease of manufacture
If the tube and diaphragms are formed as one integral unit from composite materials, then manufacturing is simplified, but design flexibility and adaptability are reduced
Solution Approach 1:
The drive shaft is segmented into separate components: a tubular portion and diaphragm members, which are manufactured independently and then assembled through mechanical connections. This segmentation enables independent optimization of each component's design and manufacturing process while maintaining overall structural integrity and flexibility
3Adaptability or versatility
If diaphragm members have undulations to allow flexing, then flexibility is improved, but manufacturing complexity increases
Solution Approach 1:
The diaphragm members are designed with undulated geometries that provide flexibility and motion capability. These flexible diaphragm structures allow relative movement between connected components while maintaining structural integrity, enabling the drive shaft to accommodate misalignment and flexing requirements
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 achieves weight reduction, simplifies manufacturing, and provides greater design flexibility while maintaining structural integrity and torsional stiffness, effectively addressing the challenges of high torque transmission and load resistance.
Implementation Method 1
The first and second diaphragm members and the tubular portion are formed of fiber-reinforced polymer matrix composites
Implementation Method 2
The diaphragms have an undulation to allow some flexing
Data Source
AI summary
A mechanical system for an aerospace application includes a drive input connected to a first axial end of a first diaphragm member, and a drive output connected to a second axial end of a second diaphragm member. The drive output is an aerospace component. The first and second diaphragm members are formed with two axial ends and at least one undulation extending radially of the axial ends. The at least one undulation is intermediate the ends. A tubular portion connects the first and second diaphragm members. The first and second diaphragm members and the tubular member are formed of fiber reinforced polymer matrix composites. The first and second diaphragm members are connected to axial ends of the tubular member by welding of the axial ends of the tubular portion to one of the inner ends of each of said first and second diaphragm members. The aerospace component is a propeller.