Gear Tooth Stress Measurements on the UH-60A Helicopter Transmission PDF Download

Author: Fred B. Oswald
Publisher:
ISBN:
Category : Black Hawk (Military transport helicopter)
Languages : en
Pages : 20

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Author: Harold H. Coe
Publisher:
ISBN:
Category : Black Hawk (Military transport helicopter)
Languages : en
Pages : 20

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Author:
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ISBN:
Category : Astronautics
Languages : en
Pages : 840

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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1224

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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1300

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 976

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 88

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Author:
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ISBN:
Category :
Languages : en
Pages : 14

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Spiral bevel gears are an important drive system components of rotorcraft (helicopters) currently in use. In this application the spiral bevel gears are required to transmit very high torque at high rotational speed. Available experimental data on the operational characteristics for thermal and structural behavior is relatively small in comparison to that found for parallel axis gears. An ongoing test program has been in place at NASA Glenn Research Center over the last ten years to investigate their operational behavior at operating conditions found in aerospace applications. This paper will summarize the results of the tests conducted on face-milled spiral bevel gears. The data from the pinion member (temperature and stress) were taken at conditions from slow-roll to 14400 rpm and up to 537 kW (720 hp). The results have shown that operating temperature is affected by the location of the lubricating jet with respect to the point it is injected and the operating conditions that are imposed. Also the stress measured from slow-roll to very high rotational speed, at various torque levels, indicated little dynamic affect over the rotational speeds tested.

Author: Harold H. Coe
Publisher:
ISBN:
Category :
Languages : en
Pages : 20

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The 2109-kW (2828-hp) UH-60A Black Hawk helicopter transmission was one of the transmissions used to obtain an experimental data base. Component improvements or new transmission concepts can thus be evaluated by comparison with the established data. In this investigation the transmission was instrumented internally and tested over a range of operating conditions. The speed was varied from 50 to 100 percent of the full rated value, and the torque was varied from 10 to 100% of the full rated value. Temperatures of internal bearings and gears were measured. The computer program Planetsys was used to simulate the thermal performance of this transmission. The calculated temperatures were then compared with the corresponding measured values. The highest measured temperature was 405 K (270 F) on the outer ring of the high-speed input shaft roller bearing, at the 100% power condition. In general, the predicted temperatures compared very well with the measured values, most of them being within 5 kelvin (9 deg F). Specifically, the temperatures predicted for the single-row spherical roller planetary bearing averaged only about 4 kelvin (8 deg F) lower than the highest measured value. Helicopter rotor transmissions; Planetary gears; Roller bearings. (EDC).

Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 20

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