Gears. A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed...

CGT 110S 2013

Gears

Definition

A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit to torque. (Wikipedia)

Two or more gears working in tandem are called a transmission and can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine. (Wikipedia)

Types of Gears

Spur Gear Parallel axis

Helical Gear Parallel axis Helicoid teeth

Skew Gears Axis at right angle and do not intersect

Double Helical Parallel axis Right & Left helical teeth Balances axial thrust forces

Bevel Axis at right angle and intersect Cone Shaped

Gear Types (cont.)

Spiral Bevels A bevel gear with angled spiral teeth

Hypoid Common in differentials Hypoidcycle teeth

Crown (contrate) Type of bevel gear

Worm Axis at right angle and do not intersect One gear is in the form of a worm

Rack and Pinion Rack is straight gear Transmits linear motion

Non-Circular

Spur Gear

http://www.google.com/url?sa=i&rct=j&q=spur+gears&source=images&cd=&cad=rja&docid=4b4l-Qni1XcZ0M&tbnid=HdVypClWGlNddM:&ved=0CAUQjRw&url=http%3A%2F%2Fscience.howstuffworks.com%2Ftransport%2Fengines-equipment%2Fgear2.htm&ei=1aRZUYjoE9PlqAHw14H4BQ&bvm=bv.44442042,d.aWM&psig=AFQjCNHDVOrJABed3K7bmL-3m5Zd3s3vNw&ust=1364915790449413

http://www.google.com/url?sa=i&rct=j&q=spur+gears&source=images&cd=&cad=rja&docid=o-UBn-JfaoArpM&tbnid=RoBDpRQe2mzKVM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.roymech.co.uk%2FUseful_Tables%2FDrive%2FGears.html&ei=6qRZUeSWCcmZqAG6_IGwAQ&bvm=bv.44442042,d.aWM&psig=AFQjCNHDVOrJABed3K7bmL-3m5Zd3s3vNw&ust=1364915790449413

Helical Gear

http://www.google.com/url?sa=i&rct=j&q=helical+gears&source=images&cd=&cad=rja&docid=r12txL0YvwkBiM&tbnid=rwKayUnhX_Yi3M:&ved=0CAUQjRw&url=http%3A%2F%2Fscience.howstuffworks.com%2Ftransport%2Fengines-equipment%2Fgear3.htm&ei=FqVZUZuuN4mPqwHrmIHADA&bvm=bv.44442042,d.aWM&psig=AFQjCNEDPlQ2uXhG_JtJYgayTvAgTWiKbw&ust=1364915860531082

http://www.google.com/url?sa=i&rct=j&q=helical+gears&source=images&cd=&cad=rja&docid=R8ngvAPpM3WW6M&tbnid=55U0dgEQ3fQOBM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.automation.com%2Flibrary%2Farticles-white-papers%2Fmotion-control%2Fengineering-reference-stealth-helical-planetary-gearhead-technology&ei=eKVZUbLwJoTVrQH-zYDoBg&bvm=bv.44442042,d.aWM&psig=AFQjCNEDPlQ2uXhG_JtJYgayTvAgTWiKbw&ust=1364915860531082

Skew Gears

http://www.google.com/url?sa=i&rct=j&q=Skew+gears&source=images&cd=&cad=rja&docid=MMsrOuxFtgFAtM&tbnid=HF3dhNfbHfUK9M:&ved=0CAUQjRw&url=http%3A%2F%2Fmodelenginenews.org%2Ftechniques%2Fskews.html&ei=aaZZUcjXII2DrQH26YGgBw&bvm=bv.44442042,d.aWM&psig=AFQjCNFKgR0ZFRjYWNXZpVNR29_OGA6W2g&ust=1364916199672968

Double Helical

http://www.google.com/url?sa=i&rct=j&q=helical+gears&source=images&cd=&cad=rja&docid=5SMnw9AJ92_khM&tbnid=cicNwxN6m2f2-M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.roymech.co.uk%2FUseful_Tables%2FDrive%2FHelical_Gears.html&ei=QqVZUfvuBciLrgH0u4G4Cw&bvm=bv.44442042,d.aWM&psig=AFQjCNEDPlQ2uXhG_JtJYgayTvAgTWiKbw&ust=1364915860531082

http://www.google.com/url?sa=i&rct=j&q=double+helical+gears&source=images&cd=&cad=rja&docid=_DoZsmqR5Y1rlM&tbnid=V9jp07HP7JPiVM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.hewitt-topham.co.uk%2Fdouble-helical-gears.html&ei=t6VZUa6uE8GCrAH2loDYBA&bvm=bv.44442042,d.aWM&psig=AFQjCNFnJLdTRItoGYMsOcw5U8_tNCKWWg&ust=1364915998581235

http://www.google.com/url?sa=i&rct=j&q=double+helical+gears&source=images&cd=&cad=rja&docid=UfZtCl4a5PeHEM&tbnid=BXNRzWkV-cjFYM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.indiamart.com%2Fpabakenterprise%2Findustrial-gears.html&ei=zKVZUdfeO4SiqQHh6IHIBQ&bvm=bv.44442042,d.aWM&psig=AFQjCNFnJLdTRItoGYMsOcw5U8_tNCKWWg&ust=1364915998581235

http://www.google.com/url?sa=i&rct=j&q=double+helical+gears&source=images&cd=&cad=rja&docid=3m2XMe6nq64NVM&tbnid=G13RRwJFg0FKHM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.globalspec.com%2Freference%2F45193%2F203279%2Fchapter-5-power-transmission&ei=3qVZUaDnFoLmqgHJvoDwAg&bvm=bv.44442042,d.aWM&psig=AFQjCNFnJLdTRItoGYMsOcw5U8_tNCKWWg&ust=1364915998581235

Bevel Gear

http://www.google.com/url?sa=i&rct=j&q=bevel+gear&source=images&cd=&cad=rja&docid=2L4LiBjmfDS25M&tbnid=qXFbDb7Gr7viAM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.directindustry.com%2Fprod%2Fmartin-sprocket-gear%2Fbevel-gears-9091-861605.html&ei=a6RZUZvUFo79qAGduIFo&bvm=bv.44442042,d.aWM&psig=AFQjCNGmE1dabCD4ihYjeSfdE4r6vTe38g&ust=1364915649380610

Spiral Gears

http://www.google.com/url?sa=i&rct=j&q=spiral+gears&source=images&cd=&cad=rja&docid=mRDxfJIEauaRjM&tbnid=v5oc7KxTMfg_3M:&ved=0CAUQjRw&url=http%3A%2F%2Fscience.howstuffworks.com%2Ftransport%2Fengines-equipment%2Fgear4.htm&ei=xKZZUf3iJZP8qAHg8oGICQ&bvm=bv.44442042,d.aWM&psig=AFQjCNGdqbVsbT46PAQreP__hu_hitbuKA&ust=1364916284422152

http://www.google.com/url?sa=i&rct=j&q=spiral+gears&source=images&cd=&cad=rja&docid=m7zQDVqIhjaWDM&tbnid=BcCNbEvqXm6cKM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.newtons-lab.com%2Fprojects%2Fnew-project%2F&ei=3aZZUYGuGYaSqgHQ4IDoAw&bvm=bv.44442042,d.aWM&psig=AFQjCNGdqbVsbT46PAQreP__hu_hitbuKA&ust=1364916284422152

Hypoid Gears

http://www.google.com/url?sa=i&rct=j&q=hypoid+gears&source=images&cd=&cad=rja&docid=SGuRZmWcxWh4-M&tbnid=0-Uhxev02YvBXM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.titantalk.com%2Fforums%2Ftitan-parts-accessories%2F97027-trutrac.html&ei=SKdZUdbzNIiJqQGpqYGgAg&bvm=bv.44442042,d.aWM&psig=AFQjCNFKUBa-oZhaVs9wIYCUZF03Z3b0iQ&ust=1364916412859777

http://www.google.com/url?sa=i&rct=j&q=hypoid+gears&source=images&cd=&cad=rja&docid=Sx60QprFPu5adM&tbnid=wsShd8-WtxEaNM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.qrbiz.com%2Fbuy_bevel-gear-cutter&ei=X6dZUf-0Ec3tqQH244HwAQ&bvm=bv.44442042,d.aWM&psig=AFQjCNFKUBa-oZhaVs9wIYCUZF03Z3b0iQ&ust=1364916412859777

Crown Gear

http://www.google.com/url?sa=i&rct=j&q=crown+gears&source=images&cd=&cad=rja&docid=Hysno3Gh-G-wRM&tbnid=xu-wci6BldTMyM:&ved=0CAUQjRw&url=http%3A%2F%2Frt-ho.com%2Fgears.html&ei=tqdZUaKZKs_3rAHvpoGgCA&bvm=bv.44442042,d.aWM&psig=AFQjCNFRTNChE7sOojVwNvVwB1MmFv7CVg&ust=1364916505656092

http://www.google.com/url?sa=i&rct=j&q=crown+gears&source=images&cd=&cad=rja&docid=_6BHsNm4nHj80M&tbnid=-Vy5PD6aqZ3WZM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.beam-wiki.org%2Fwiki%2FGear&ei=3adZUaaGKIParAGq-oCoDA&bvm=bv.44442042,d.aWM&psig=AFQjCNFRTNChE7sOojVwNvVwB1MmFv7CVg&ust=1364916505656092

Worm Gear

http://www.google.com/url?sa=i&rct=j&q=worm+gears&source=images&cd=&cad=rja&docid=1jUa9CPxqRRHJM&tbnid=9dsghZMR3f2asM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.howstuffworks.com%2Fgear5.htm&ei=F6hZUfKrBMTLrQH87oGQAQ&bvm=bv.44442042,d.aWM&psig=AFQjCNEPQ2XFp5xQWnsu20gWh0lQjkHuxw&ust=1364916629014022

Rack and Pinion

http://www.google.com/url?sa=i&rct=j&q=rack+and+pinion+gears&source=images&cd=&cad=rja&docid=FEp6Nrz1BlDV2M&tbnid=4gJxisOCIBlxEM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.piniongear.org%2Fusing-rack-pinion-gears-in-various-mechanical-theory-based-devices%2F&ei=pKhZUYW0MoeuqgHui4CwCQ&bvm=bv.44442042,d.aWM&psig=AFQjCNHgIhC0xqA0X5IZR2jkR14_3qFJHw&ust=1364916758971190

http://www.google.com/url?sa=i&rct=j&q=rack+and+pinion+gears&source=images&cd=&cad=rja&docid=eUZCmwca46beYM&tbnid=eI0imvvN1z535M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.daerospace.com%2FMechanicalSystems%2FGearsGen.php&ei=tqhZUYSLF4qFrQGzn4CIDg&bvm=bv.44442042,d.aWM&psig=AFQjCNHgIhC0xqA0X5IZR2jkR14_3qFJHw&ust=1364916758971190

Non-Circular Gear

http://www.google.com/url?sa=i&rct=j&q=non-circular+gears&source=images&cd=&cad=rja&docid=nSZ5Quh_ITksIM&tbnid=FCm8bNnduInIEM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.chibadies.co.jp%2Fen%2Fproducts%2Fcontents03.html&ei=SalZUaTRM8f3qQGLxoCwBw&bvm=bv.44442042,d.aWM&psig=AFQjCNGRBXgxY_CdYPXTTATegtMfroEyWw&ust=1364916930224075

http://www.google.com/url?sa=i&rct=j&q=non-circular+gears&source=images&cd=&cad=rja&docid=ER8g9kwiOyJH6M&tbnid=DlO288FHfhwG-M:&ved=0CAUQjRw&url=http%3A%2F%2Fexcelmathmike.blogspot.com%2F2009%2F10%2Fgeometry-makes-world-go-elliptical.html&ei=calZUaLhJYaZqgHCw4CICg&bvm=bv.44442042,d.aWM&psig=AFQjCNGRBXgxY_CdYPXTTATegtMfroEyWw&ust=1364916930224075

Gear Terminology

Tooth Profile

Involute Gear

http://www.excelcalcs.com/repository/machines/gears/involute-coords.xls/

Tooth Contact Nomenclature

Tooth Thickness Nomenclature

Pitch Nomenclature

Gear Blanks

http://www.google.com/url?sa=i&rct=j&q=gear+blanks&source=images&cd=&cad=rja&docid=WNnkSBubeuXc7M&tbnid=RYKy-1_e4zVKkM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.mckeesrocksforgings.com%2Fgearblanks.htm&ei=DK9ZUaqEF87RqwGwn4CYDw&bvm=bv.44442042,d.aWM&psig=AFQjCNEya9e8RpxvrP7cr_B58ix8oe2Qjg&ust=1364918409626388

http://www.google.com/url?sa=i&rct=j&q=gear+blanks&source=images&cd=&cad=rja&docid=YGM3SxZN3FucPM&tbnid=-8J0_4-jRtFHTM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.arihantcnc.com%2Fcatalog.html&ei=I69ZUdbqGIaEqgH2jIGgBA&bvm=bv.44442042,d.aWM&psig=AFQjCNEya9e8RpxvrP7cr_B58ix8oe2Qjg&ust=1364918409626388

http://www.google.com/url?sa=i&rct=j&q=gear+blanks&source=images&cd=&cad=rja&docid=PxeAWuJ1TroSgM&tbnid=cBG24hwmxJUfQM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.protonmetalcrafts.com%2FGalleria.aspx&ei=Nq9ZUe3uGo_xqQGu5YCYAg&bvm=bv.44442042,d.aWM&psig=AFQjCNEya9e8RpxvrP7cr_B58ix8oe2Qjg&ust=1364918409626388

http://www.google.com/url?sa=i&rct=j&q=gear+blanks&source=images&cd=&cad=rja&docid=YxBO99Y4ZT6f4M&tbnid=XBl9xa9puGU30M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.zsqts.com.cn%2FGear-Gearbox-Speed-Reducer-c-1009&ei=Yq9ZUdj2DZKgqwGKpIHIAw&bvm=bv.44442042,d.aWM&psig=AFQjCNEya9e8RpxvrP7cr_B58ix8oe2Qjg&ust=1364918409626388

Gear Manufacturing

http://www.google.com/url?sa=i&rct=j&q=gear+manufacturing&source=images&cd=&cad=rja&docid=_faZhOMC3GpaGM&tbnid=Y6I7SRMMQnoInM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.bellgears.co.uk%2FHelical-Gear-Manufacture.htm&ei=169ZUdvIMsaYqQGgrIHwBQ&bvm=bv.44442042,d.aWM&psig=AFQjCNELmFobbbByUL8De5LH0NWcQute4w&ust=1364918595929173

http://www.google.com/url?sa=i&rct=j&q=gear+manufacturing&source=images&cd=&cad=rja&docid=ALRpSSRxjpTCGM&tbnid=TfTcQTU06d1MXM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.griffingear.com%2Fgear-manufacturing.html&ei=5q9ZUcScNZL0rAGe24HICQ&bvm=bv.44442042,d.aWM&psig=AFQjCNELmFobbbByUL8De5LH0NWcQute4w&ust=1364918595929173

http://www.google.com/url?sa=i&rct=j&q=gear+hob&source=images&cd=&cad=rja&docid=7Vi7RDlKOINW1M&tbnid=WX5BAHBL67OChM:&ved=0CAUQjRw&url=http%3A%2F%2Fcqyuzhou.en.alibaba.com%2Fproduct%2F590824774-213615794%2FSteel_M35_Module_2_TIN_Coating_Gear_Hob.html&ei=dLFZUZOXPMidqgHPtYCIAg&bvm=bv.44442042,d.aWM&psig=AFQjCNGpRcwMn4G8H_3qJ0Jp_y_ptWJUhw&ust=1364919017156346

Large Gears

http://www.google.com/url?sa=i&rct=j&q=large+gears&source=images&cd=&cad=rja&docid=WpD4jPVwQZsX9M&tbnid=B4xWVheYpy7gbM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.agroengineers.com%2Fworm-shaft-worm-gears.shtml&ei=E7BZUbiNNImArAGz9oBY&bvm=bv.44442042,d.aWM&psig=AFQjCNH0NN5N3gUSHs0cHNrjH0xntUL-2Q&ust=1364918672180862

http://www.google.com/url?sa=i&rct=j&q=large+gears&source=images&cd=&cad=rja&docid=ZjizLKfC39asAM&tbnid=j5Xf5DsutZLfzM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.hmcgears.com%2Fgears%2Flarge-gears.php&ei=OLBZUbKIGYm5qAH5uoGAAw&bvm=bv.44442042,d.aWM&psig=AFQjCNH0NN5N3gUSHs0cHNrjH0xntUL-2Q&ust=1364918672180862

http://www.google.com/url?sa=i&rct=j&q=large+gears&source=images&cd=&cad=rja&docid=0JFn2-mh8_2sFM&tbnid=MV7wBa12IpVPuM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.cbgear.com%2FCB-Gears1.htm&ei=U7BZUefRKoipqwHyq4GYDg&bvm=bv.44442042,d.aWM&psig=AFQjCNH0NN5N3gUSHs0cHNrjH0xntUL-2Q&ust=1364918672180862

Gear Box

http://www.google.com/url?sa=i&rct=j&q=gear+box&source=images&cd=&cad=rja&docid=dQTiydzTcO868M&tbnid=L2--kznQ0np7VM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.wisegeek.org%2Fwhat-is-a-gearbox.htm&ei=DbJZUdb7D4LkrAGogIHAAg&bvm=bv.44442042,d.aWM&psig=AFQjCNEsnlGazhB730n_X7oeQ9dVYI_03A&ust=1364919146007974

Date post:	31-Mar-2015
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Gears. A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed...

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