Optical Coupling Monitoring for Shaft Hub Alignment
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Solution Overview
Problem
The challenge in mechanical couplings is the difficulty in determining if shafts are properly positioned within hubs after assembly, leading to potential misalignment and reduced torque-carrying capacity, which can result in failure of engagement and affect product repeatability and yield, especially in semiconductor fabrication processes.
Innovation Solution
A coupling monitoring system is implemented with aligned through holes on each hub, allowing for automated position monitoring using a sensor system that detects light transmission to determine proper locking and axial displacement, triggering alarms or stopping operations when thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automated monitoring is implemented through through holes in hubs, then shaft position monitoring capability is improved, but device complexity increases
Solution Approach 1:
The hub is segmented by introducing through holes that pass through the hub body, allowing optical access for monitoring shaft position without requiring complex internal sensors or disassembly. This segmentation enables simple optical detection while maintaining structural integrity.
Solution Approach 2:
Light serves as an intermediary medium to detect shaft position. By introducing light through the through holes, the system can monitor shaft alignment and position indirectly through optical transmission, avoiding direct mechanical or electronic sensing complexity.
2Reliability
If shaft position monitoring is implemented, then reliability of coupling engagement is improved, but manufacturing complexity increases
Solution Approach 1:
The monitoring function is achieved by segmenting the hub structure with through holes, which are relatively simple to manufacture using standard machining operations. This approach avoids complex assembly of multiple monitoring components.
Solution Approach 2:
The coupling structure itself provides the monitoring capability through the through holes and light transmission properties. The existing materials and structural elements are utilized for dual purposes: mechanical support and optical monitoring, eliminating the need for separate manufacturing processes for monitoring components.
3Reliability
If real-time monitoring is implemented, then ability to prevent misalignment is improved, but loss of time for operations increases
Solution Approach 1:
The monitoring system operates continuously through the through holes during coupling operation, providing real-time shaft position feedback without interrupting the mechanical function. This eliminates the need for periodic shutdowns or manual inspections.
Solution Approach 2:
Optical monitoring replaces mechanical sensing or manual inspection methods. Light transmission through the through holes provides instantaneous detection of shaft position, eliminating time-consuming mechanical measurement procedures.
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 system ensures proper locking and monitoring of shaft positions, preventing misalignment and failure, thereby maintaining stability, repeatability, and yield in semiconductor processes by providing real-time feedback and control measures.
Implementation Method 1
aligned through holes on each hub, allowing for automated position monitoring using a sensor system that detects light transmission
Data Source
AI summary
A coupling including a main body, a first hub at a first end of the main body and a second hub at a second end of the main body opposite the first end is provided. The first hub includes a first inner bore configured to receive a first shaft and a pair of aligned first and second through holes extending through opposite walls of the first hub. The first through hole and the second through hole are in optical communication with the first inner bore.