Helical Drive Coupling for Misaligned Torque Transfer
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Solution Overview
Problem
Mechanical systems face challenges in transferring rotational motion and torque between components with misalignment or relative motion, as traditional solid drive shafts and couplings like universal joints fail to accommodate angular misalignment and cyclical changes in distance effectively.
Innovation Solution
The use of helical drive couplings with intermeshed helical elements connecting end adapters allows for high-speed, constant-velocity torque transfer while accommodating limited misalignment and axial translation, eliminating oscillatory frequencies and enabling continued operation with damaged components through redundant design and fault-indicating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional solid drive shafts and universal joints are used, then torque transfer is achieved, but misalignment and relative motion between components cannot be effectively accommodated
Solution Approach 1:
The drive shaft is divided into multiple sections with telescopic capability, allowing relative motion between segments while maintaining torque transfer. The helical gear elements are segmented into multiple teeth that engage progressively, accommodating misalignment while transmitting torque reliably.
Solution Approach 2:
The coupling incorporates dynamic elements including telescopic sections that extend and retract to accommodate axial motion, and helical gear elements that maintain continuous contact through rotational engagement, adapting to varying misalignment conditions while ensuring reliable torque transfer.
2Speed
If helical drive couplings are used to accommodate misalignment and enable high-speed torque transfer, then adaptability and speed are improved, but device complexity increases
Solution Approach 1:
The invention merges multiple functions into a single coupling assembly: torque transfer, misalignment accommodation, and axial motion compensation are integrated into one unit. The helical gear elements simultaneously transmit torque and accommodate angular misalignment, while telescopic sections handle axial motion, reducing the need for separate components.
Solution Approach 2:
The helical drive coupling serves multiple functions: it transfers torque at high speeds, accommodates angular misalignment between drive shaft and driven component, and allows for axial telescopic motion. This multi-functionality reduces the need for additional specialized components, managing overall system complexity despite the sophisticated mechanism.
3Reliability
If redundant design with fault-indicating materials is implemented, then reliability during damaged operation is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Fault-indicating materials are pre-installed within the coupling assembly during manufacturing. These materials are positioned to detect and indicate damage before it compromises safety or performance, allowing for proactive maintenance. The redundant helical gear teeth are also pre-configured to provide continued torque transfer capability if some teeth are damaged.
Solution Approach 2:
The fault-indicating materials automatically detect and signal damage conditions without requiring external monitoring systems. The redundant design allows the coupling to self-adjust and continue operation with reduced capacity rather than complete failure, providing inherent fault tolerance that simplifies overall system reliability management.
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
This solution ensures reliable high-speed torque transfer with limited misalignment and translation, maintaining operation even with damaged components, and provides early detection of failures, enhancing the durability and reliability of mechanical systems.
Implementation Method 1
a plurality of helical elements connecting the first end adapter to the second end adapter
Implementation Method 2
allowing for limited misalignment ('cocking') of the axes and for limited axial translation ('chucking')
Data Source
AI summary
A drive coupling has first and second coaxial end adapters. A first set of at least two coaxial helical elements has a first end of each element attached to the first end adapter, and a second end of each element is coupled to the second end adapter. At least one biasing device biases the end adapters relative to each other. Torque applied to one of the end adapters is transferred through the first set of helical elements to the other end adapter, the helical elements allowing for misalignment of the end adapters during operation.