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Long Term High Energy Clutch/Braking Technique
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English
Abstract
A wet clutching/braking mechanism has been designed to operate as prescribed in a patent issued to R. A. Iverson in 1982 (1)*. A key element in this design is to allow high radial oil flow rates through the clutch plate stack to carry the heat generated during power absorbtion away from the clutch disks. A continuously variable transmission incorporating this new clutch was constructed and tested under contract to NASA in which the clutch assembly was found to absorb 5.78 × 10−3 KW/cm2 (0.05 HP/in2) of surface area with no supplemental oil cooling. As a result of the new design, an equal fraction of torque was transmitted through each of the disks in the clutch pack and no wear of the clutch plates was descernable after several hours of high energy rejection operation. As applied to transmissions, this design eliminates the need for torque convertors/fluid couplers and tolerates long duration of slippage.
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Citation
Renfroe, D. and Iverson, R., "Long Term High Energy Clutch/Braking Technique," SAE Technical Paper 861346, 1986, https://doi.org/10.4271/861346.Also In
References
- Iverson, R.A. Patent No. 4358001 “Wet Disk Friction Brake Circulation System,” November 9 1982
- Wagner, D.A. “Rotorcraft Drive Trains and Gearing,” Contractor Coordinating Meeting NASA Lewis June 11-12 1985
- Aschauer, G. “The Redundant Omega Clutch - A Marine Propulsion Clutch for Turbines,” ASME 76-GT-65
- Tataiah, K. “An Analysis of Automatic Transmission Clutch-Plate Temperatures,” SAE 720287
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- Reddy, R.N. Sen, D.D. Keshav, M.S. “Torque Capacity of a Multidisc Clutch,” SAE 690268
- Aseff, P.A. Lubrication Theory and Practice Lubrizol Corporation Wickiiffe, Ohio
- Goodman, Malcom C. Haviiand, Merril L. “Friction Characteristics of Smooth and Rough Limited-Slip Differential Clutch Plates,” Journal of the American Society of Lubrication Engineers 330 6 305 314
- Shigley, J.E. Mechanical Engineering Design McGraw-Hill 1963
- Zhuchkov, V.H. Filippoy A.N. “Hydrodynamic Resistance of Friction Disc Elements,” Mechanical Sciences 2 Soviet Academy of Sciences 1970