| Description |
1 online resource (7 pages) : illustrations. |
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text txt rdacontent |
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computer c rdamedia |
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online resource cr rdacarrier |
| Series |
NASA technical memorandum ; 107275 |
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Army Research Laboratory technical report ; ARL-TR-1150 |
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NASA technical memorandum ; 107275.
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ARL-TR (Aberdeen Proving Ground, Md.) ; 1150.
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| Note |
Title from title screen (viewed July 19, 2016). |
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"July 1996"--Report documentation page. |
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"Prepared for the Seventh International Power Transmission and Gearing Conference sponsored by the American Society of Mechanical Engineers, San Diego, California, October 6-9, 1996." |
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"Performing organization: NASA Lewis Research Center and Vehicle Propulsion Directorate, U.S. Army Research Laboratory"--Report documentation page. |
| Bibliography |
Includes bibliographical references (page 7). |
| Access |
APPROVED FOR PUBLIC RELEASE. |
| Summary |
Planetary gear transmissions are compact, high-power speed reductions which use parallel load paths. The range of possible reduction ratios is bounded from below and above by limits on the relative size of the planet gears. For a single plane transmission, the planet gear has no size at a ratio of two. As the ratio increases, so does the size of the planets relative to the sizes of the sun and ring. Which ratio is best for a planetary reduction can be resolved by studying a series of optimal designs. In this series, each design is obtained by maximizing the service life for a planetary with a fixed size, gear ratio, input speed power and materials. The planetary gear reduction service life is modeled as a function of the two-parameter Weibull distributed service lives of the bearings and gears in the reduction. Planet bearing life strongly influences the optimal reduction lives which point to an optimal planetary reduction ratio in the neighborhood of four to five. |
| Funding |
Sponsored by the National Aeronautics and Space Administration and the U.S. Army Research Laboratory WU-505-62-36 1L162211A47A E-10343 |
| Subject |
Service life.
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Gears.
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Transmissions (Machine elements)
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Planetary gears.
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Transmissions(mechanical)
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Load distribution.
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Optimization.
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Life expectancy(service life)
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Computer aided design.
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Transmission gears.
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Torque.
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Bending stress.
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Gear teeth.
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Mechanics.
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| Indexed Term |
PE62211A |
| Added Author |
Rubadeux, K. L., author.
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Coe, Harold H., author.
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Lewis Research Center, issuing body.
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United States. National Aeronautics and Space Administration, sponsoring body.
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U.S. Army Research Laboratory, sponsoring body.
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| Other Form: |
Microfiche version: Savage, M. (Michael). Effects of planetary gear ratio on mean service life (OCoLC)38145946 |
| Standard No. |
DTICE ADA318693 |
| Gpo Item No. |
0830-H-15 (online) |
| Sudoc No. |
NAS 1.15:107275 |
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