AGMA-01FTM2-2001.pdf
《AGMA-01FTM2-2001.pdf》由会员分享,可在线阅读,更多相关《AGMA-01FTM2-2001.pdf(16页珍藏版)》请在三一文库上搜索。
1、01FTM2 The Ultimate Motion Graph for “Noiseless” Gears by: H.J. Stadtfeld and U. Gaiser, The Gleason Works TECHNICAL PAPER American Gear Manufacturers Association Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, B
2、ernie Not for Resale, 04/18/2007 11:25:44 MDTNo reproduction or networking permitted without license from IHS -,-,- The Ultimate Motion Graph for “Noiseless” Gears Hermann J. Stadtfeld and Uwe Gaiser, The Gleason Works Thestatementsandopinionscontainedhereinarethoseoftheauthorandshouldnotbeconstrued
3、asanofficialactionor opinion of the American Gear Manufacturers Association. Abstract Theinnovationwastodevelopageargeometrythatreducesoreliminatesgearnoiseandincreasesthestrengthofgears. Gearnoiseisacommonprobleminallbevelandhypoidgeardrives. Avarietyofexpensivegeargeometryoptimizations are applied
4、 daily in all hypoid gear manufacturing plants, to reduce gear noise. In many cases those efforts have little success. Additional expensive finishing operations (lapping after the grinding) are applied to achieve the goal of quiet andstronggearsets. Theultimatemotiongraphisaconceptformodulatingtheto
5、othsurfacesthatusesaphysicaleffectto cancel out the dynamic disturbances that are naturally generated by all up- -to- -date known kind of gears. The ultimate motion graph also eliminates the sensitivity of gears against deflection under load or displacements because of manufacturing tolerances. Lowe
6、r dynamic disturbances will also increase the dynamic strength. Copyright ? 2001 American Gear Manufacturers Association 1500 King Street, Suite 201 Alexandria, Virginia, 22314 October, 2001 ISBN: 1- -55589- -781- -9 Copyright American Gear Manufacturers Association Provided by IHS under license wit
7、h AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 11:25:44 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 The Ultimate Motion Graph for “Noiseless” Gears Dr. Hermann J. Stadtfeld Vice President, Research and Development Uwe Gaiser, B.
8、 Sc. Manager, Application Engineering The Gleason Works Design Practice Today According to classic design, gearsets have three principal types of tooth form modifications. The type of tooth modification depends to the highest degree on the possible flank form modifications versus the conjugate flank
9、 form. The intent of flank modifications is to provide a limited contact area under no load or light load which provides insensitivity to gear housing tolerances, inaccuracies in the gear members and assembly, as well as deflections. The corrections keep the contact pattern inside the boundaries of
10、the teeth and, therefore, prevent edge contact. For cutting bevel gears there are three mechanisms to create modifications that have the intent to locate the bearing contact. Those modifications are called “crowning“. The first element is lengthwise crowning which is a circular modification along th
11、e face width. If a ring gear is cut to the conjugate theory and a circular modification is applied to the pinion the result of the interaction between pinion and gear after cutting is shown in Figure 1. Length crowning can be generated by modifying the cutter radius vs. the theoretical conjugate rad
12、ius. For example, by reducing the length radius on a convex flank, clearance will be provided towards the heel or toe end of the tooth. Similarly, length crowning can be generated by tilting the face cutter head around the flank line tangent and by a corresponding change of the blade angles. The so-
13、called Ease-Off represents the interaction between pinion and gear roll position by roll position, across the whole flank surface. Pinion and gear are rotated from contact line to contact line about discrete angles with respect to their ratio. If we visualize this process, it becomes clear that a co
14、ntact between the two mating flanks exists only in theoretical conjugate points. If no crowning were applied to the case shown in Figure 1, the Ease-Off topography would be a flat surface on top of the presentation plane with zero deviation in the ordinate direction 1. The Ease- Off presentation pla
15、ne is an axial projection of the gear tooth like the outline of the gear tooth in a cross-sectional, two-dimensional blue print. In case of crowning, generally only one point or one line will remain, where the Ease-Off topography is zero. If it is one point, then this location is called the “mean po
16、int”. The mean point is the only location inside the entire flank area where the ratio is Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 11:25:44 MDTNo reproduction or networkin
17、g permitted without license from IHS -,-,- 2 Figure 1: Ease-Off with lengthwise crowning accurate and no acceleration or deceleration occurs; it is a conjugate point. In case of a contact in line between Ease-Off and presentation plane, this line is called “mean line“. The mean line can cross many c
18、ontact lines as shown in Figure 1, or it might be identical to one contact line. It can (but does not have to) be identical to the path of contact (see also 2). The second element to generate crowning is a profile modification on the tool. A concave curvature on the cutting edge of a blade (versus a
19、 straight edge) will take stock off on top and flank and cause a circular profile crowning. Figure 2 presents a profile crowning that results in a high bias contact if it is the only or the dominating correction. The third element of flank crowning is a flank twist from toe to heel. Figure 3 shows t
20、he classic flank twist. The most commonly used methods to obtain an Ease-Off as shown in Figure 3 is a cutter tilt around the root angle axis and a corresponding change of the machine root angle. Other methods are the use of modified roll Figure 2: Ease-Off with profile crowning and helical motion 1
21、. All real bevel and hypoid gear applications used in power transmissions (and many cylindrical gears) use a combination of all three types of crowning. Figure 3: Flank twist with bias out contact In case of face milling, there is no basic machine set-up that provides conjugate flank geometry. Cutti
22、ng in the root line plane and rolling in a plane that matches the pitch line can only be approximated for gears with a tapered tooth depth. The elements of flank form correction are used in the gear design of tapered depth tooth systems to eliminate the systematic deviations from conjugate to some e
23、xtent and leave a desired crowning characteristic. Principally, this Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 11:25:44 MDTNo reproduction or networking permitted without l
24、icense from IHS -,-,- 3 leads to similar flank corrections that were once applied to face hobbed gearsets with a uniform tooth depth design. Research Project to Develop Tooth Contact and Single Flank Characteristics for Quiet Rolling Gearsets The subject of a research project conducted at The Gleaso
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- AGMA 01 FTM2 2001
链接地址:https://www.31doc.com/p-3732672.html