Design a bushed-pin type flexible coupling for connecting a motor shaft to a pump shaft for the following service conditions: Power to be transmitted = 40 kW; speed of the motor shaft 1000 r.p.m. ; diameter of the motor shaft 50 mm ; diameter of the pump shaft = 45 mm. The bearing pressure in the rubber bush and allowable stress in the pins are to be limited to 0.45 N/mm2 and 25 MPa respectively. %3D %3D %3D %3D [Ans. d, = 20 mm; n= 6; d, = 40 mm; 1=152 mm] %3D %3D %3D

Design a bushed-pin type flexible coupling for connecting a motor shaft to a pump shaft for the following service conditions: Power to be transmitted = 40 kW; speed of the motor shaft 1000 r.p.m. ; diameter of the motor shaft 50 mm ; diameter of the pump shaft = 45 mm. The bearing pressure in the rubber bush and allowable stress in the pins are to be limited to 0.45 N/mm2 and 25 MPa respectively. %3D %3D %3D %3D [Ans. d, = 20 mm; n= 6; d, = 40 mm; 1=152 mm] %3D %3D %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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11. Design a bushed-pin type flexible coupling for connecting a motor shaft to a pump shaft for the following service conditions: Power to be transmitted = 40 kW ; speed of the motor shaft = 1000 r.p.m.; diameter of the motor shaft = 50 mm; diameter of the pump shaft = 45 mm. The bearing pressure in the rubber bush and allowable stress in the pins are to be limited to 0.45 N/mm² and 25 MPa respectively. [Ans. d, = 20 mm; n = 6; d₂ = 40 mm; / = 152 mm]
Design and draw a neat sketch of a cast iron protective type flange coupling to transmit “P” kW at “N” rpm. from a turbine generating n electric motor to a compressor. The service factor may be assumed as 1.35. The following permissible stress may be used: Shear stress for shaft, bolt and key material = 40 MPaCrushing stress for bolt and key = 80 MPaShear stress for cast iron = 8 Mpa Speed N in Rpm = 200Power P in kN = 16
Design and draw a neat sketch of a cast iron protective type flange coupling to transmit “P” kW at “N” rpm. from a turbine generating n electric motor to a compressor. The service factor may be assumed as 1.35. The following permissible stress may be used: Shear stress for shaft, bolt and key material = 40 MPaCrushing stress for bolt and key = 80 MPaShear stress for cast iron = 8 MpaSpeed N in Rpm = 250Power P in kN = 21
1. A collar is fitted as a tight fit on a solid shaft. In the measurement made before assembly, the outer diameter of the ring is dga=159.97 mm, the inner diameter is dgi= 100.03 mm, and the outer diameter of the shaft is dma= 100.048 mm. After assembly; a. What is the surface pressure between the shaft and the ring? b. What is the maximum shear stress? Given: Material pair steel/steel P E=2.1x10$ N/mm?, Tmax (1-Q¿)
A) A shat of diameter of d= 35 mm is subjected to a torque varying between 100 N.m to 500 N.m. The SCF due to keyway is 1.5, Su = 500 MPa, S', = 200 MPa. Correction factor for torsion=0.6. Surface finish factor=0.85 and size factor=0.82. Find the value of fatigue factor of safety F.S. Is the design of the shaft safe or not? And why?
The width of the belt used if its thickness is 6 mm. Ans. 261 mm 8. A nylon-core flat belt has an elastomer envelop; is 200 mm wide, and transmits 60 KW at a belt speed of 25 m/s. The belt has a mass of 2 kg/m of the belt length. The belt is used in a crossed configuration to connect a 300 mm diameter driving pulley to a 900 mm diameter driven pulley at a shaft spacing of 6 m. A. Calculate the belt length and the angles of wrap. Ans. 13.95 m, 3.34 rad or 191.4° B. Compute the belt tensions based on a coefficient of friction of 0.33. Ans. 1.76 KN, 1.96 KN
Design a bushed-pin type flexible coupling for connecting a motor shaft to a pump shaft for the following service conditions : Power to be transmitted = 40 kW ; speed of the motor shaft = 1000 r.p.m. ; diameter of the motor shaft = 50 mm ; diameter of the pump shaft = 45 mm. The bearing pressure in the rubber bush and allowable stress in the pins are to be limited to 0.45 N/mm2 and 25 MPa respectively. %3D !! [Ans. d, = 20 mm; n = 6; d, = 40 mm ;l = 152 mm] !3! COO01
8. Design a shaft and flange for a Diesel engine in which protected type of flange coupling is to be adopted for power transmission. The following data is available for design : Power of engine = 75 kW; speed of engine = 200 r.p.m.; maximum permissible stress in shaft = 40 MPa; maximum permissible twist in shaft = 1° in length of shaft equal to 30 times the diameter of shaft; maximum torque = 1.25 x mean torque; pitch circle diameter of bolts = 3 x diameter of shaft; maximum permissible stress in bolts = 20 MPa. Find out: 1. Diameter of shaft, 2. number of bolts, and 3. diameter of bolts. Ans. 100 mm: 4: 22 mml
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5. Design a compression coupling for a shaft to transmit 1300 N-m. The allowable shear stress for the shaft and key is 40 MPa and the number of bolts connecting the two halves are 4. The permissible tensile stress for the bolts material is 70 MPa. The coefficient of friction between the muff and the shaft surface may be taken as 0.3. [Ans. d = 55 mm; D = 125 mm; L=192.5 mm; d = 24 mm] 720
PROBLEM: A flange coupling is to connect two 57 mm shafts. The hubs of the coupling are each 111 mm in diameter and 92 mm hub length. Six 16-mm bolts in a 165-mm diameter bolts circle connect the flanges. The keyway is 6 mm shorter than the hub length and the key is 14 mm x 14 mm. Coupling is to transmit 45 kW at 160 rpm. For all parts, yield point value in shear is one-half the yield point value in tension or compression that is 448 MPa. Find a) the shearing stress of key and its factor of safety; b) the bearing stress of key and the factor of safety based on yield point; c) the shearing stress in bolts and factor of safety based on yield point. (Board problem, November 1983) 14 mm x 14 mm x 86 mm d = 16 mm Dr = 111 mm D= 57 mm Dp = 165 mm w = 50 mm 92 mm Dimensions in mm
Q7 Design a rocker arm of I-section made of cast steel for operating an exhaust valve of a gas engine. The effective length of the rocker arm is 250 mm and the angle between the arm is 135°. The exhaust valve is 80 mm in diameter and the gas pressure when the valve begins to open is 0.4 N/mm2. The greatest suction pressure is 0.03 N/mm below atmospheric. The initial load may be assumed as 0.05 N/mm? of valve area and the valve inertia and friction losses as 120 N. The ultimate strength of cast steel is 750 MPa. The allowable bearing pressure is 8 N/mm2 and the permissible stress in the material is 72 MPa.