AGMA 04FTM9-2004 Design of a High Ratio Ultra Safe High Contact Ratio Double Helical Compound Planetary Transmission for Helicopter Applications《直升机设施用双螺旋混合行星齿轮传动高接触传动比率超安全高传动比的设计》.pdf
《AGMA 04FTM9-2004 Design of a High Ratio Ultra Safe High Contact Ratio Double Helical Compound Planetary Transmission for Helicopter Applications《直升机设施用双螺旋混合行星齿轮传动高接触传动比率超安全高传动比的设计》.pdf》由会员分享,可在线阅读,更多相关《AGMA 04FTM9-2004 Design of a High Ratio Ultra Safe High Contact Ratio Double Helical Compound Planetary Transmission for Helicopter Applications《直升机设施用双螺旋混合行星齿轮传动高接触传动比率超安全高传动比的设计》.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、04FTM9Design of a High Ratio, Ultra Safe, HighContact Ratio, Double Helical CompoundPlanetary Transmission for HelicopterApplicationsby: F.W. Brown, M.J. Robuck, G.K. Roddis and T.E. Beck,The Boeing CompanyTECHNICAL PAPERAmerican Gear ManufacturersAssociationDesign of a High Ratio, Ultra Safe, High
2、ContactRatio, Double Helical Compound PlanetaryTransmission for Helicopter ApplicationsFrederick W. Brown, Mark J. Robuck, G. Keith Roddis and Timothy E. BeckThe Boeing CompanyThe statements and opinions contained herein are those of the author and should not be construed as anofficial action or opi
3、nion of the American Gear Manufacturers Association.AbstractAn ultra-safe, high ratio compound planetary transmission, for application as a helicopter main rotor drive,has been designed under the sponsorship of the National Rotorcraft Technology Center- Rotorcraft IndustryTechnology Association (NRT
4、C/RITA). It is anticipated that this new planetary transmission offersimprovements relative to the current state-of-the-art including, reduced weight, reduced transmitted noiseand improved fail-safety. This paper discusses the analysis and design results for the subject planetarytransmission. Fabric
5、ation and testing of the transmission will be conducted in subsequent phases of theproject.Typically, the final stage in helicopter main rotor drives consists of one or two simple planetary stages whichthemselvesarecomposedofasungear,multipleplanetgears(typicallybetween3and6)andaninternalgearwhich i
6、s generally the fixed member of this epicyclic system. The main rotor transmission is the most criticalandusuallytheheaviestassemblyinthedrivesystemforanyrotarywingaircraft,beitasingleortandemrotorhelicopter or a tilt rotor vehicle.Thenewultra-safe,highratioplanetarytransmissiondesignutilizesacompou
7、ndplanetaryconfigurationwitha17.5:1reductionratiowhichwouldreplaceaconventionaltwostagesimpleplanetarytransmission.Thenewdesignusesultra-safeprinciplessuchassplit-torquepathsandhighcombinedcontactratiogearing.Doublehelical gears in the planet/ ring meshes balance axial tooth forces so that axial bea
8、ring reactions are notrequired. The spur gear sun/planet meshes are staggered to achieve a compact spatial arrangement.In order to provide major, simultaneous improvements in weight, noise, power density, and reliability, aparadigm shift must occur in the basic design of the gear system in this comp
9、onent. This program bringstogether a large number of individual gear system innovations which, taken together, are expected to yield alarge improvement in noise and performance combined with improved reliability and fail safety.Copyright 2004American Gear Manufacturers Association500 Montgomery Stre
10、et, Suite 350Alexandria, Virginia, 22314October, 2004ISBN: 1-55589-832-71Design of a High Ratio, Ultra-Safe, High Contact Ratio, Double Helical Compound Planetary Transmission for Helicopter Applications Frederick W. Brown, Mark J. Robuck, G. Keith Roddis and Timothy E. Beck The Boeing Company, Roto
11、rcraft Division, Philadelphia, PA Introduction Currently, the final gear reduction stages in virtually all helicopter main rotor drives consist of one or two simple spur planetary stages. These simple planetaries are composed of a sun gear, multiple planet gears (typically between 3 and 6) and an in
12、ternal gear that is generally the fixed member of this epicyclic system. While this proven concept provides relatively good power transmission efficiency, it has a tendency to generate high noise levels due to the limited contact ratio of the individual gears and the multiple, often simultaneous, to
13、oth contacts of the several planet gears. The simple planetary drives often used in helicopter main transmissions are subject to several technical limitations. Load capacity is limited as a function of the number of planets that can be accommodated within the internal gear that is, itself sized by t
14、he combination of ratio requirements and allowable stress limits. The planet bearings, which are generally mounted in the bore of each planet gear, must be sized to carry the applied loads and to allow a minimum rim thickness under the planet gear teeth. This requires the planet gear and bearing to
15、be optimized as a unit. In addition, more planets improve load capacity but as the reduction ratio is increased, the number of planets that will fit in the annulus between the sun and ring decreases. Practical reduction ratios, which can be obtained from one-stage simple planetary systems, are limit
16、ed by geometry to approximately 5:1. Because of this limitation, two stages (or more) are often required to obtain higher reduction ratios. Because the simple planetary system is densely packed, a gear tooth failure is generally very destructive as the high power density and very limited space among
17、 the gears prove to be a vulnerable configuration. While it might seem, on the surface at least, that the use of multiple planets would provide parallel load paths, which might offer some redundancy, quite the opposite is true. In a conventional design, the planets themselves provide little in the w
18、ay of fail- safety; rather the dense package almost assures consequential damage will occur. Another consideration is that when a planet gear looses load-transmitting capability, the internal load balance of the planets is compromised so that radial mesh loads are no longer balanced on both the sun
19、and internal ring gears. Technical Approach Despite the limitations cited above, the planetary gear system, in a general sense, is far from obsolete. Many still serve quite well in applications flying all over the world. One aircraft which utilizes a two-stage simple planetary design is the CH-47D C
20、hinook helicopter. While this transmission system was designed in the late 1970s, it continues to be a reliable and efficient gearbox to this day. However, improvements are necessary for the next generation of rotorcraft transmissions. Rather than scrapping the entire concept, an improved planetary
21、concept has been investigated that retains that which is good about the simple planetary and adds specific features or design enhancements. These features are directed at increasing load capacity, improving system safety and the ability to withstand single tooth faults, while decreasing the generate
22、d noise level and reducing weight. To circumvent the limitations of current planetary designs and to investigate improved gear arrangements for helicopter main rotor drives, a high ratio, Ultra-Safe, 2high contact ratio, staggered and intermeshed planet, double-helical compound epicyclic gear system
23、 concept was developed. This gearbox arrangement is intended to provide simultaneous improvements in load capacity, noise level, and system safety. A technical effort, under the sponsorship of the National Rotorcraft Technology Center- Rotorcraft Industry Technology Association (NRTC/RITA), with the
24、 following objectives is currently being conducted to address this improved planetary speed reducer design: 1. Develop the concept configuration and basic gear system design for an improved planetary gear system with the following technical goals: Reduce planetary subsystem weight by 25% compared to
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