Tài liệu Clutches and brakes design and selection P13 pdf
Tài liệu CLUTCHES AND BRAKES Design and Selection
... h
0
Chapter 482
5
Dry and Wet Disk Brakes and Clutches
This chapter on disk brakes and clutches will consider annular contact disk
clutches and both caliper and annular contact disk brakes, as illustrated ... multiple-disk brakes and clutches, illustrated in Figure 3, have
similar multiple-disk construction, but operate in an oil bath. Thus these
brakes are isolate...
Tài liệu Clutches and brakes design and selection P2 doc
... 2
BandBrakes
Bandbrakesaresimplerandlessexpensivethanmostotherbrakingdevices,
withshoebrakes,asperhapstheirnearestrival.Becauseoftheirsimplicity,
theymaybeproducedeasilybymostequipmentmanufacturerswithout
havingtopurchasespecialequipmentandwithouthavingtousefoundryor
forgingfacilities.Onlytheliningmustbepurchasedfromoutsidesources.
Bandbrakesareusedinmanyapplicationssuchasinautomatic
transmis...
Tài liệu Clutches and brakes design and selection P3 docx
... f
0
ð1-14Þ
Externally and Internally Pivoted Shoe Brakes 37
Copyright © 2004 Marcel Dekker, Inc.
3
ExternallyandInternallyPivotedShoe
Brakes
TypicalexternallyandinternallypivotedshoebrakesareshowninFigures1
and ... brake life, heat
dissipation, fading, and braking torque capability.
III. DESIGN OF DUAL-ANCHOR TWIN-SHOE DRUM
BRAKES
For both external and internal shoes and for...
Tài liệu Clutches and brakes design and selection P4 pdf
... 4
LinearlyActingExternalandInternal
DrumBrakes
Linearlyactingdrumbrakesarethosefittedwithshoeswhich,whenacti-
vated,approachthedrumbymovingparalleltoaradiusthroughthecen-
teroftheshoe.TypicallinearlyactingdrumbrakesareillustratedinFigures
1–3.
Analysisoflinearlyactingbrakesincludesthoseinwhichthecentrally
pivotedshoesareattachedtopivotedlevers,asinFigure1.Includingbrakes
ofthisdesignwithinthec...
Tài liệu Clutches and brakes design and selection P5 docx
... Inc.
Evaluationoftheseintegralsiseasiestforbrakepadswithradialand
circularboundaries,asinFigure4,forwhichequation(1-4 )and( 1-5)maybe
writtenusingadummyvariablefas
F¼p
max
r
i
Z
A
1
r
da¼p
max
r
i
Z
r
0
r
i
Z
u
0
dfdrð1-6Þ
¼p
max
r
i
uðr
0
Àr
i
Þ
and
T¼Ap
max
r
i
Z
A
da¼Ap
max
r
i
Z
r
o
r
i
rdr
Z
u
0
df
ð1-7Þ
¼Ap
max
r
i
u
2
r
2
o
Àr
2
i
ÀÁ
Fromequation(1-7)wefindthatforthepressuredistributi...
Tài liệu Clutches and brakes design and selection P6 ppt
... Inc.
II.FOLDEDCONEBRAKE
Prototypeconebrakeshavebeendesignedandtestedforarangeofvehicle
sizes,fromtractorsandtrailerstosubcompactautomobiles[1].Boththelarge
andsmallsizesusedafoldedconedesign,asillustratedinFigures 5and6 ,
eachwitha=27j.Althoughtheconebrakehasfewerpartsthandrum
brakes, thisadvantagemustbebalancedagainstthedisadvantageofrequiring
anoutboardwheelbearing.
Analysisofthefoldedcone...
Tài liệu Clutches and brakes design and selection P7 pdf
... Inc.
Beyondthispointthetorquedecreasesrapidly,asshownintheslip
torqueversusspeedcurveinFigure13(a).ComparisonwithFigure13(b)
correctlyimpliesthattheshapeofthedecreasing-torqueportionofthecurve
totherightofthecriticalpointreflectsboththechangeinthehysteresisloop
withincreasingtemperatureandtheheattransfercharacteristicsofthe
coolingsystem(i.e.,whetherairorliquidandthetemperatureandvelocity
ofth...
Tài liệu Clutches and brakes design and selection P8 ppt
... !
¼6:344lb-ftð6-6Þ
¼76:130lb-in:
wheren
i
=1/5.488fortheendrollersandn
i
=1/1.254fortheintermediate
rollers.
Ifthebrakehadbeenmountedoneitheroftheendrollershafts,
equation(6-6)wouldhavebeenreplacedby
T¼
4:114
0:1553
"
2ð0:0759Þþ20ð0:000556Þð4:375Þ
2
þ
230
32:2
4:375
12
2
#
¼34:811lb-ftð6-7Þ
andthebrakingtorquerequirementwouldhavebeenn=5.488timeslarger
thanthatfoundbyequation(6-6).This...
Tài liệu Clutches and brakes design and selection P9 ppt
... 1 and 2
30j between detents 2 and 3
130j between detents 8 and 3
and that the angular separation between detent centers 1 and 5 is given by
25j between detents 1 and 2
30j between detents 2 and ... detents 3 and 4
40j between detents 4 and 5
130j between detents 1 and 5
The second instance occurs when balls 8 and 1 engage detents 1 and 5,
where ball centers 8 and 1 a...
Tài liệu Clutches and brakes design and selection P10 pdf
... Inc.
Thistypeofdriveisaninexpensivealternatetobevelgearsforaright-
angledrive,aclutch,andareversingmechanism.
Whentheright-handconeinFigure8ismoveddownwardtocontact
theupperhalfofthedoubleconeandtheleft-bandconeismovedupwardto
contactthelowerhalfofthedoublecone,boththeleft-andright-handcones
rotateinthesamedirection.Iftheright-andleft-handconesdrivetheright-
andleft-handwheelsofalawnmower,the...
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