Timing Belts Catalogue

Calculation Examples153Calculation ExamplesStep b: Select Torque, moulded, jointedor open length materialDue to the required centre-centredistance of 10 metres moulded beltsare not suitable. Torque and belts madefrom open length material (jointed) canbe produced to the required length.However Torque belts cost more andhave a longer lead time. For this reason ajointed belt is selected..Step d: Calculation of pulley sizeSince the diameter shall be approximately 200 mm, a correspondingpulley can be selected in the pulley table of theHTD 14 m timing belt catalogue pages: a pulley with 45 teethshows an outside diameter of 200.54 mm, a pulley with 44teeth shows a diameter of only 196.08 mm. 44 teeth is standardsize (highlighted line) which can be delivered from stock.Result step 4:pulley with 44 teethResult step 2:Selection of jointed beltStep c: Select tooth profile and pitchTo select a belt type from the diagrams,the speed needs to be known. This canbe calculated by the requested pulley sizeof 200 mm and the conveying velocity:v 0,3m/ sn = = *60s/ min = 28,61/ minπ * D π *0,2mIn the diagram “forces jointed”, find theintersection point of speed and force(from step 1). The next line above thispoint (orange) represents HTD 14 Mbelts.Step e: Calculation of belt widthThe formula to calculate the belt width:Fw =t * F2872N== 37, mm6*12,71N/ mm7tb e specAccording to the table of standard width the next size is40 mm .Result step 5:belt width 40 mmStep f: Calculation of the preliminary centre-centredistanceThis step is unnecessary since the centre-centre distance islimited to 10,000 mm (see given data).Calculation ExamplesResult step 3:timing belt HTD 14 MStep g: Calculation of belt lengthSince the pulleys all have the same diameter, the simplifiedformula can be used:la[ mm] = 2*10000 + 44*14 mmtb, = 2* CC + p*t= 20616Checking the pitch: 20616 mm/14 mm/tooth = 1472.5 teeth> select 1472 teeth.Result step 7:Selected belt length is 1472*14 mm = 20608 mmCopyright © Ammeraal Beltech 2006