Question

A flat metal belt made of Beryllium-Copper (BeCu) is Sf = 375 MPa and transmits at 8.24 kW / min and 8.25 kW of power. The belt life is 935 mm and 106 turns. The friction coefficient between the belt and the pulley will be 0.34, the operating coefficient is 1.41, and the design coefficient will be 1.55. Under the rotated pulley, the motor is 3.25 times the pulley diameter. Calculate belt belt and length for 0.20 mm in belt area and for pulley with minimum diameter. Belt width is required in 5 mm and its layers. Calculate the pretension force to be applied.

Answer 1

solution vriven, Sp=345MPa Becu Transmitted Power PL) = 8.25 KW co-efficient of friction (A) =0-34 Operating co-efficient (kg) =14) design co-efficient (ny) =)555 Distance between two Shaft (C) =986 mon liven, Dilimeter of bigger Pulley Eds)=3153 diameter of d2 = 3:25d Smaller pulleydi) belt thickness (t) = 0.20 mm belt width (b) = 5mm., Number of turn=106 Now, design Power (0) = R kend = 8:2158 1.41X1555 P = 18-03kw, power - Torque fromtable for o minimum diameter of Pulley At belt thickness (t) = 0.20 mm di = 125mm diameter of smaller pulley (dy) = 125mm diameter of bigger pulley (2) = 3.25 da = 3:25X125 =906:25mm contact angle are 0=18d, = 1 - 93in ( da.edl) –T-28104 (1062x1125) Od = 2.845 vad Od, = TT+ 23 int(dpady ) =a + 28;n! 3.435 rad 406:25-1237 2x956 G

Length of y flat belf (L) = [ue==(2-doba \(8@$+8,8%) -- [uryeso?- (16 29-10612_) 0-4 123 vastasy 805) L=2766-75 mm Length of belt (4) = 2766 75mm for Becu Sp= 375 hPa, E=1172X105 MPai 8-0.220 Allowable tension (ha) = | Sp Et 1tb (1-12) 5, Fila = 375 - 1.172X105 x 0.2 = 37 (Xo 2x5 (1-0.222 X 125 Fia = 177.95 N Allowable tension ( Fia) =147.95N for full friction development explfodi) = exp(0.34 X2.845)=26308 Et t Fra 177.95 = 35.59 N/mm U a= (SR- 1-2 di b Bell Width (beim A exp(fo) a ex Plfø)-1 4E 2.6308, P. 35.59 (2.6308-)) 4F=110.31N Fq = Fg AF = 177.95-110.3) = 67.64N Frafra AF = 27 = 10.314 Td = 4F = 11013) - 55155 explPod) + = 122.79 explrod-i 2.6308- [ F= Fut F2 = 122. tej initial tension in bell (FJ) =12279 N =350195 3:630877