齿轮类型及应用（Types of Gear and Their Applications）.pdf

Typesof

gear

1

Straight

spur

Aspurisalateralridgeor

tongueoflanddescending

fromahill,mountainor

maincrestofaridge.

2

HelicalSpur

Helicalgearslastlongerandare

idealforhigh-loadapplications,

sincetheyhaveahighernumber

ofteethincontact.Loadisatall

timesdistributedamongseveral

axes,whichproduceslesswear.

3

Herringbone

Usedfortransmittingpower

betweenparallelshafts.Itwas

developedtoovercomethe

disadvantageofthehigh-end

thrustthatispresentwithsingle-

helicalgears.

4

PlainBevel

Bevelgearsaregearswherethe

axesofthetwoshaftsintersect

andthetooth-bearingfacesofthe

gearsthemselvesareconically

shaped.

5

SpiralBevel

Spiralbevelgearsarebevelgears

whoseaxesintersect,oftenata

90-degreeangle.Theteethare

cutwithaslightcurvealongtheir

lengthandaninvoluteprofile.

6

Hypoid

Hypoidgearsarenormallyusedin

right-angledrivesassociatedwith

theaxlesofautomobiles.Hypoid

gearsareauniquecategoryofspiral

bevelgearsthatareusedtotransmit

rotationalpowerbetweentwoshafts

atrightangles.

7

Planetary

Planetarygearsetsareusedinautomatic

transmissions,andtheyincludearing

gear,planetcarrierandsungears.

Securingthesungearortheplanet

carrierproducesdifferentratios.High

efficiencyduetolowrollingpower.Almost

unlimitedtransmi