heaimistoshowhowtheoptimizatio
ofthegeargeometrydescribedi
PaperEisusedi
a
i
dustrialapplicatio
Theauthorwasprojectma
agerforthe“
oiseworkteam”a
dperformedthe
fgearoptimizatio
O
eoftherequireme
tswhe
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ga
ewautomaticpowertra
smissio
forawheelloaderwasimprovi
gthetra
smissio
gear
oiseTheexisti
gpowertra
smissio
wask
ow
tobe
oisyWhe
drivi
gathighspeedi
fourthgearahighfreque
cygearwhi
ecouldbeheardThustherewere
owdema
dsforimprovedsou
dqualityThetra
smissio
isatypicalwheelloaderpowertra
smissio
co
sisti
gofatorqueco
verteragearboxwithfourforwardspeedsa
dfourreversespeedsa
dadropboxpartlyi
tegratedwiththegearboxThedropboxisachai
offourgearstra
sferri
gthepowertotheoutputshaftThegearsaree
gagedbywetmultidiscclutchesactuatedbythetra
smissio
hydraulica
dco
trolsystem
22Gear
oisetargetforthe
ewtra
smissio
Experie
cehasshow
thatthehighfreque
cygear
oiseshouldbeatleast15dBbelowother
oisesourcessuchasthee
gi
ei
order
ottobeperceivedasdisturbi
goru
pleasa
tMeasureme
tsshowedthatifthegear
oisecouldbedecreasedby10dBthiscriterio
shouldbesatisfiedwithsomemargi
Freque
cya
alysisofthe
oisemeasuredi
thedriverscabshowedthatthedomi
a
t
oisefromthetra
smissio
origi
atedfromthedropboxgearsThegoalfortra
smissio
oisewasthusformulatedasfollows“Thegear
oisesou
dpressurelevelfromthedropboxgearsi
thetra
smissio
shouldbedecreasedby10dBcomparedtotheexisti
gtra
smissio
i
order
ottobeperceivedasu
pleasa
tItwasassumedthatitwouldbe
ecessarytomakecha
gestoboththegearsa
dthetra
smissio
housi
gi
ordertodecreasethegear
oisesou
dpressurelevelby10dB
23Noisea
dvibratio
measureme
ts
I
ordertoestablisharefere
ceforthe
ewtra
smissio
oisea
dvibratio
weremeasuredfortheexisti
gtra
smissio
Thetra
smissio
isdrive
bythesametypeofdiesele
gi
eusedi
awheelloaderThee
gi
e
fa
dtra
smissio
areattachedtothesta
dusi
gthesamerubbermou
tsthatareusedi
awheelloaderi
ordertomakethei
stallatio
assimilaraspossibletothei
stallatio
i
awheelloaderTheoutputshaftisbrakedusi
ga
electricalbrake
24Optimizatio
ofgears
Noiseoptimizeddropboxgearsweredesig
edbychoosi
gmacroa
dmicrogeometriesgivi
glowertra
smissio
errortha
theorigi
alrefere
cegearsThegeargeometrywaschose
toyieldalowtra
smissio
errorforthereleva
ttorquera
gewhilealsotaki
gi
toco
sideratio
variatio
si
themicrogeometryduetoma
ufacturi
gtolera
cesTheoptimizatio
ofo
egearpairisdescribedi
moredetaili
PaperETra
smissio
errorisco
sidereda
importa
texcitatio
mecha
ismforgearwhi
eWelbour
1defi
esitas“thediffere
cebetwee
theactualpositir