V-belt

Calculate the length of the belt on pulleys with diameters of 105 mm and 393 mm at shaft distance 697 mm.

Correct answer:

l =  2.2 m

Step-by-step explanation:

 r1=d1/2=52.5 mm r2=d2/2=196.5 mm Δr=r2r1=144 mm α=arctg(lΔr)=arctg(697144)=11.67=0.20373330910633 dr=l2(Δr)2=6972(144)2=681.96 mm l1=r1(π2α)=143.54 mm l2=r2(π+2α)=697.39 mm l=l1+l2+2dr=1000143.54+697.39+2681.96=2.2 m 



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