Analysis of a Skewed Roller Clutch
PSU BOEING-2 TEAM: Jake Frederick, Rich Matrunick, Scott Murphy,
Chris Suhocki
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Our Solution:
The following steps were taken during the process of our project in order to meet our final results:
1. Derived governing equations to be used in the computer analysis to simulate the parameters under investigation which included: roller geometry, skew angle and plate pressure. All of these parameters were compared to the influence they have on the coefficient of friction between the rollers and pressure plates.
2. Developed a computer-aided theoretical analysis using MathCAD. Results were plotted as a family of curves for non-dimensional parameters. A sample curve of our analysis for a 0.125 inch diameter roller is shown in Figure 1.
3. Developed a testing/verification strategy to provide a way to measure output torque of the clutch while varying plate pressure and lubrication, roller geometry and skew angle as a function of output torque. From the measurement of the transmitted torque the coefficient of friction was calculated. The concept CAD drawing of the test stand is shown in Figure 2.
4. Used test stand to test clutches and recorded results of output torque. Actual device used a pulley and weights system (not shown in Figure 2) to determine output torque for a given plate pressure. Pressure was applied with a press and was measured using a load cell.
5. Compared test stand data with predicted results for the given skewed roller clutch using Excel.
Figure 1
Figure 2
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April 28, 2003