Question

The figure shows a 400-mmidiameter brake drum with four internally expanding shoes. Vach of the hinge pins 4 and 8 sapports a pair of shoes. The sctuating mechanism is to be aranged to produce the same force F on each shoe. The face width of the shoes is 75 mm The material unel permits a coefficient of friction of 0.24 and a maximum pressure of 100o kPa.) (a) Determine the actuating force. (b) Estimate the brake capacity (c) Notingg that rotation may be in either direction, estimate the hinge-pin reactions iria 15° 15 10° 10 10 10 R 15 15 The dimensions in millimeters are a-150, c 165, R = 200, and d-50.

Answer 1

dz o.osOM 75 Cc 0.1S0m Cz O.laSm Ca 75 Paz 106 pa bz 0.0m Y 0200m A z Sn ode a 8p 6la us 200 m tt nad 180 1OT eed B 0S28 C

03 Cz 0.415 Nou Pa or C024) Co-) Coa(oos M42 Mh 281N (lo60 Co05)C0100)lo-018) Peu bra MNO SA75 MNz 1230N Aclatry fou F) 1230-28 MN- MA Fa F-S01N CBrude Cafui The Primey shoe T2 Sn Ca

024L10) Co.O5) Loro) -o 2 WNINS 21 The Sewday shoe 281 1230 MNE T06 Pa 289 1230 Pe b19 Co) Pa oruCob) uo) Co-os Co00) loyo-Cons) Tz T 335N-m Th elul 2Tpin sha)t 2C7sandy sha) 2cult 21335) Ttolelz 1750NM

(U) CC tinge pn ecehd) RAmeryhoe -FL CLo6) Co 0s) Co-o)Co.us4 14-014 Co-58) Uo StVEs Rakz -S30 -0.6s8N Rys SinBa CU6) Cu-o0 0S8to4 Co.usH C) Stvas -O- 9.88N Sdunduy shoe Pabv Cct t)-Fx Rnz StnOa o.ok) Co-a) CosusiytouCog)) Stvs St0 -0.143N -

Pabr CB- Clo CosloreD) Co.58-040-us4) C3 2 Stuss -0 4.03N Combining hotsontal and uuial Component DH-0.6s8-0 l43 - 0'801 M 2 - Ryz9.88-403 S-8s PHS:901AN