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How to Design a Spur-Crown Gear

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How to Design a Spur-Crown Gear ASK THE EXPERT How to design a spur/ 12th International Plus: Transmission Expo crown gear set. THE QUESTION CTI Symposium Automotive Transmissions, HEV and EV Drives hen designing a spur/crown pair, is there a formu- 2-5 December 2013, Berlin la/guideline/design guide for adapting the spur Germany 8-11 December 2014, Berlin Wteeth for the radial angle of the teeth in the crown? Experts in the Plenum Response provided by Chuck Schultz, P.E., ([email protected]). Diagrams for straight bevel gear sets can be found in An In- Dr Carsten Breitfeld | BMW AG The beginning of wisdom, and this answer, is calling things troduction to Gear Design, which is available for free down- by their proper name. While there is some standardiza- load at this author’s website — www.beytagear.com. Dr Herbert Demel tion in terminology for the worldwide gear industry, “spur/ If, on the other hand, you meant a face gear set: Dr Ulrich Eichhorn | German Association of the crown pair” sent me to the Internet in hopes that this term Face gear sets mesh with intersecting shafts and are gener- Automotive Industry (VDA) Dr Robert Fischer | AVL List GmbH had somehow eluded my vocabulary. Alas, Wikipedia did ally made for right-angle configurations. Face gear sets use a Dr Carsten Breitfeld Dr Herbert Demel Dr Ulrich Eichhorn Dr Robert Fischer Jean-Marc Gales not settle the matter other than to assign the term “crown” conventional spur or helical pinion with constant cross- sec- Jean-Marc Gales | CLEPA to a face gear. We are aware of some engineers calling a bevel tion teeth to drive a gear that has tapered cross-section teeth. Jörg Grotendorst | Siemens AG gear a “crown gear,” as well, so I will offer two separate an- The pinions are hobbed or ground; the gears are milled or Takashi Hata | Jatco Ltd. swers to your question. shaped to match the pinion. Bernd Heid | McKinsey & Company, Inc. If you meant a straight bevel gear set: The design of these gears has never been standardized for Straight bevel gears mesh with intersecting shafts and can larger gears. AGMA standard 203.03 — Fine Pitch On-center Mihir Kotecha | GETRAG Corporate Group be made for right-angle and other angular configurations. Face Gears for 20 Degree Involute Spur Pinions — has been Jörg Grotendorst Takashi Hata Bernd Heid Mihir Kotecha Thomas Kroher Thomas Kroher | ADAC Motorwelt The teeth in both members taper in cross-section — from withdrawn from the active files, but may contain the infor- Max Nakagawa | Denso International Europe outside diameter to inside edge. There are two commonly mation you need. Darle Dudley’s Gear Handbook (McGraw- Arnold Paluch | Adam Opel AG used “systems” for designing these gear sets: 1) the Gleason Hill, 1962, Library of Congress Catalog Card Number: 61- Coen Rooijmans | Bosch Transmission Technology B.V. System employs a tapering tooth depth as well as tapering 7304), devotes pages 5-71 through 5-74 to the design of face tooth thickness; 2) and the Klingelnberg system employs a gears. This book should be considered an essential for any Prof. Dr Dirk Uwe Sauer | RWTH Aachen constant tooth depth with a tapering tooth thickness. gear engineer’s library. Ulrich Schwarz | Denso International Europe Neither system has shown a power capacity advantage for Diagrams for face gear sets can also be found in An Intro- Max Nakagawa Arnold Paluch Coen Rooijmans Prof. Dr Dirk Uwe Sauer Ulrich Schwarz equivalent designs. duction to Gear Design, which is available for free download Design guidance can be obtained from Gleason and at this author’s website: www.beytagear.com. Extensive OEM reports Panel discussion Klingelnberg, who supply manufacturing equipment and Charles D. Schultz, PE, is chief engineer for Beyta Gear Service, Winfield, Illinois, cutting tools. Many gear reference books also discuss the de- longtime Gear Technology technical editor and life-long gear guy. Special sessions 2013: “CO2 Challenge – How to master it?” sign of straight bevel gear sets. You may also find Gear Design Simplified, by Franklin D. Jones and Henry H. Ryffel (Indus- CVT, Commercial Vehicles, Functional Safety trial Press, 1961, ISBN 978-0-83311-0209-8), helpful as well. Delegates from over 20 countries I was pleased to learn this old reliable reference has been re- Simultaneous Translation German English printed in paperback. 1,700 participants in USA, China & Europe in 2012 English Conference Documentation! Most international* industry meeting in Europe (* over 40% participants from non-German speaking countries) Sponsors 2013: Follow us on: Web www.getriebe-symposium.de/gt #CTI_sym www.facebook.com/euroforum.de Blog www.transmissionsanddrives.com 34 Power Transmission Engineering OCTOBER 2013 WWW.POWERTRANSMISSION.COM]———— P2300327_Anz_203_273_3mm_Anschnitt_PTE.indd 1 06.09.2013 11:11:55.
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