Clutches and Brakes Design and Selection Part 15 pot

... 301 References 316 Chapter 14 Engineering Standards for Clutches and Brakes 317 I. SAE Standards 317 II. American National Standards Institute (ANSI) 320 III. Other Standards Organizations 320 Bibliography ... according to the SAE J661 standard. Field perform- Friction Materials 9 2 Band Brakes Band brakes are simpler and less expensive than most other braking devices, with shoe...

Ngày tải lên: 20/10/2012, 09:58

... Inc. suchasbronze,glass,andgraphite,significantlyaddtothewearresistanceof PTFE[3].Glassappearstobethemostcommonlyused. B.Kevlar KevlaristheDuPonttradenameforanaramid(aromaticpolyamidefiber) thathasatensilestrengthgreaterthansomesteels,i.e.,someofthesefibers haveamodulusupto27 Â 10 6 psi(1.86 Â 10 5 Mpa).Neverthelesstheyare flexibleenoughtobewovenandprocessedastextiles,soKevlarbrakelinings andclut...

Ngày tải lên: 09/11/2013, 03:15

... pressure upon the lining. Band Brakes 23 Copyright © 2004 Marcel Dekker, Inc. 2 BandBrakes Bandbrakesaresimplerandlessexpensivethanmostotherbrakingdevices, withshoebrakes,asperhapstheirnearestrival.Becauseoftheirsimplicity, theymaybeproducedeasilybymostequipmentmanufacturerswithout havingtopurchasespecialequipmentandwithouthavingtousefoundryor forgingfacilities.Onlytheliningmustbepurchasedf...

Ngày tải lên: 17/12/2013, 11:15

... Inc. Thislinkforceandtheactivatingmomentbothactonthesecondary shoe,sothattheforceandmomentequationsofequilibriumforthesecond- aryshoebecome F r 2 ¼Àrw Z f 2 f 1 pcosfdfþArw Z f 1 f 2 psinfdfþF l sinf 2 þ h 2  ð5-7Þ F u 2 ¼Àrw Z f 2 f 1 psinfdfþArw Z f 2 f 1 pcosfdfþF l cosf 2 þ h 2  ð5-8Þ where2histheanglesubtendedbytheadjustinglink.Next, M a 2 ¼M p 2 þM f 2 À2RF l sin f 2 2 sin f 2 2 þ h...

Ngày tải lên: 17/12/2013, 11:15

... Inc. 4 LinearlyActingExternalandInternal DrumBrakes Linearlyactingdrumbrakesarethosefittedwithshoeswhich,whenacti- vated,approachthedrumbymovingparalleltoaradiusthroughthecen- teroftheshoe.TypicallinearlyactingdrumbrakesareillustratedinFigures 1–3. Analysisoflinearlyactingbrakesincludesthoseinwhichthecentrally pivotedshoesareattachedtopivotedlevers,asinFigure1.Includingbrakes ofthisdesignwithi...

Ngày tải lên: 17/12/2013, 11:15

... Inc. 5 DryandWetDiskBrakesandClutches Thischapterondiskbrakesandclutcheswillconsiderannularcontactdisk clutchesandbothcaliperandannularcontactdiskbrakes,asillustratedin Figures1,2 ,and3 . Caliper disk brakes, ... Airflex Division, Cleveland, OH.) Dry and Wet Disk Brakes and Clutches 93 Copyright © 2004 Marcel Dekker, Inc. used on large earth-moving equipment, on mine shuttle cars, a...

Ngày tải lên: 17/12/2013, 11:15

... sin aÞð1-10Þ Cone Brakes and Clutches 109 Copyright © 2004 Marcel Dekker, Inc. II.FOLDEDCONEBRAKE Prototypeconebrakeshavebeendesignedandtestedforarangeofvehicle sizes,fromtractorsandtrailerstosubcompactautomobiles[1].Boththelarge andsmallsizesusedafoldedconedesign,asillustratedinFigures 5and6 , eachwitha=27j.Althoughtheconebrakehasfewerpartsthandrum brakes, thisadvantagemustbebalanceda...

Ngày tải lên: 17/12/2013, 11:15

... Inc. Beyondthispointthetorquedecreasesrapidly,asshownintheslip torqueversusspeedcurveinFigure13(a).ComparisonwithFigure13(b) correctlyimpliesthattheshapeofthedecreasing-torqueportionofthecurve totherightofthecriticalpointreflectsboththechangeinthehysteresisloop withincreasingtemperatureandtheheattransfercharacteristicsofthe coolingsystem(i.e.,whetherairorliquidandthetemperatureandvelocity ofth...

Ngày tải lên: 17/12/2013, 11:15

... Inc. Thekineticenergiesmaybefoundfrom n 14 ¼ 1 16 n 24 ¼ 1 3:2 n 34 ¼ 1 3:2 m 1 ¼1278m 2 ¼276m 3 ¼721m 4 ¼231 r 1g ¼0:81r 2g ¼0:17r 3g ¼0:32r 4g ¼0:09 I g1 ¼m 1 r 2 1g I g2 ¼m 2 r 2 2g I g3 ¼m 3 r 2 3g I g4 ¼m 4 r 2 4g I d ¼m d r 2 dg ke d ¼ 1 2 I d n 2 14 ke g1 ¼ 1 2 I g1 n 2 14 ke g2 ¼ 1 2 I g2 n 2 24 ke g3 ¼ 1 2 I g3 n 2 34 ke g4 ¼ 1 2 I g4 wherem 1 throughm 4 arethemassesofgears1through4,...

Ngày tải lên: 17/12/2013, 11:15

... 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...

Ngày tải lên: 17/12/2013, 11:15