Sleeve Bearing Materials and Lubricants for Advanced Airframes.
BATTELLE COLUMBUS LABS OHIO
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Bearing materials, shaft materials, and lubricants for airframe-bearing applications have been evaluated using an apparatus that simulates the loads, motions, and temperatures encountered by typical airframe bearings. Beryllium-copper bearings, which are capable of operation at very high stresses in reversing-load applications, were found to be limited to 20,000 psi for satisfactory operation in unidirectional loading. On the other hand, aluminum-bronze bearings were capable of operation at higher unidirectional loads than they were under reversing loads. Beryllium-copper bearings were also found to be sensitive to lubricant starvation regular relubrication is required to insure satisfactory operation. Elevated-temperature bearing experiments using several versions of MIL-G-81322 grease showed a considerable variation in performance. While some versions operated successfully at 350F which is the maximum recommended temperature, others were limited to 300F. MIL-G-81322 and MIL-G-27617 provided adequate corrosion protection for unplated steel shafts in all but severe corrosion situations. Plasma-sprayed aluminum-bronze and 440C stainless steel were shown to be promising airframe-bearing and shaft materials. Author
- Machinery and Tools