Question

3. A single plate clutch, effective on both sides, is required to transmit 25 kW at 3000 r.p.m. Determine the outer and inner radii of frictional surface if the coefficient of friction is 0.255, the ratio of radii is 1.25 and the maximum pressure is not to exceed 0.1 N/mm². Also determine the axial thrust to be provided by springs. Assume the theory of uniform wear. (2 marks)

Answer 1

given data: na 2 po 25 kwa 25 810 watt NO 300G 7pm WE 29 N = 21173000 314.2 radis GO 60 0.255 : 1.25 , pmax 0.1 mpg ve outer radius ma inner sadiys 1.25 Ara 1.2572 p pouler 2S T. W , TN 31 2 99.6710 N.mm Ta

intensity of pressure is maximum at the inner radius (12) Przac = 0.182 Nimm transmited to the and the axial frictional Thaust suoface. 2ņC (H-82) Wo : : 20180.112 ( 1.25m2-12) " 0.157 (6823 mean wadius of the foictional surface for uniform wear W412. 1.2512 + 12. 1:12512 RE - 2 2 T= nuwe 99.6x16 = 20.255 x 0.157 12 x 1.12572 : 0.09 r23

12 - 99.6410 0.09 884 X10 12 12 = (884810') } 12 96 mm able 1.2562 120 mm . h= 120mm, r2 = 96mm / ans Axial Thoust to be provided by sparings : Wa ancchi-82) : 0.1597(423 W= 0.1594/960² lw = 1447 N 7 Ans. Ans.