Question

Design the V-belt drive for the following specifications: Specify the belt size, Belt type, The sheave size, the number of belts, the angles of wrap, the belt length, The center distance, The adjusted horsepower Driver type: AC MOTOR Driven machine: Fan Service hours/day: 22 Input speed: 1750 rpm Input power: 5 hp Nominal output speed: 725 rpm

Answer 1

duty fan We are selecting av-belt solution liven, input power (P) = 5hp 10. input speed (N) = 1750 8pm output speed (N2) = 725 8pm service howo day 22 hour Now, from table for medium and 22 hour service peoday, service factor (kg) = 1.3 Design Power = Pikg = 5X113=615 hp with she motor driving at 17500pm, from Chart belf speed is worm ft/min 18 optimum. No = uso Ft) min So, diameter of Driver Shave (d) = 21 ) di = 2x Usło 25x1750 0,8189 ft from table, we are selecting standaod diameter of doiver Sheare is 10.6In (8,=10:6. In) diameter of closiven sheave (dz) =(VR)d, VR a velocity routio - 1730 = 2:4138 diameter of doiven sheavel d2) = 2.4138X10.6 Estimated center distance for belt drive: = 25.58 In da Lcc 3lditde) 25:58<C_31016+28:58) - 25:58 Lcc 108.54 In di = 0:8189x12 = 9.827 In

2 NOW Estimated center distince (C) – 2358+108:34 = 67.06IN Length of belf ( 1) = 2C+$, (09 tdi) + (d2-2012 uc L = 8x67-06) + A(2558+106) + (25:58-10.62 UX 67.06 L=191.76 In Length of belt (1) = 19 1.76 In Now, Actual center distence (C) B+JB2_32/d3-d152 16 B-UL- 20+ (d2 +d1) = UX19:46-21(2598+10.6) B=53983 In C= 539837](539-83)2_3212838 -10-612 16 c = 67.06 In Actual center distance (c) = 67.661. In Angle of woup o for drouver : 0d, = 180— 28109 dard, Odi = 180-2sint (25758-10.61 Od, - 167.140 Angde of woup fro doiven, Oy = 180° + 9Binil doday = 180° +2sint (25.18-10.6 Od = 192.8250 Angle of contact correction Factor (ks) at 00, -167140 Ki=0.96 Od 0192 Ki-0192 Belf-Length correction Portor (ko) at et bell Length(9-191-46In for 3 V-belt, K2=1.18 2x61.06 2x67.06

Audion Po pove o rating for B-V belf at Ny=1# soppm and dy=10:6. In Power rating (Pg) = 12 hp corrected power = PoX Ky XK2 = 12x0.96X1.18=13:59 hp Number of belt Design power corrected power 13:59 Required number of belf is due to less design power, -0.478~1