= It is required to design a split muff coupling to transmit 60 kW power at 140 rpm. The shafts, key 420 N/mm²). The yield strength in and clamping bolts are made of plain carbon steel (σyt compression is 160% of the tensile yield strength. The factor of safety for shafts, key and bolts is 5. The number of clamping bolts is 8. The coefficient of friction between sleeve halves and the shaft is 0.3. (i) Calculate the diameter of the shaft. (ii) Specify the length and outer diameter of the sleeve halves. (iii) Find out the diameter of clamping bolts. (iv) Specify the size of key and check the dimensions for shear and compression criteria

a. A four-cylinder engine has a 85 mm bore ? and 90 mm stroke ?, and operates at 5000 rpm.What is the power lost to piston skirt friction?  b. What is the power (?) lost to main crankshaft friction in a four-cylinder engine with a 100mmbore and stroke if the engine is operating at 1500 rpm? Assume the main crankshafthas five bearings, each with a diameter of 50 mm and length of 25 mm. in hand written

A. PROBLEM ON TOPIC "KEYS AND COUPLINGS": A coupling with material AISI C1045 as rolled transmits 65.5 HP at 1750 rpm. The material of the 1.75 inch shaft... is also AISI C1045 as rolled and the key is cold drawn AISI C1020. N= 2.5. Determine the following: 1. Size of bolt (dia.) if there are 6 bolts made of AISI C1045 as rolled at a bolt circle of 5 inches. Note: Select standard bolt diameter from AT14 of DOME by Faires (see Lecture on fasteners for this Table) Calculated Dia: Standard Size to use: 2. Required b and t if a flat or rectangular key is used: Answer: 3. Required length of key, if a flat or rectangular key is used: Note: Calculate for two type of stresses on key, then select your answer. Length Based on shear length Based on compression: Length to use: 4. Required bif a square key is used: Answer: 5. Required length of key, if a square key is used: Note: Calculate for two type of stresses on kev, then select your answer. Length Based on shear length Based on compression:…

Design a clamp coupling to transmit ‘35’ kW at ‘120’ r.p.m. The allowable shear stress for the shaft and key is ‘50’ MPa and the number of bolts connecting the two halves are six. The permissible tensile stress for the bolts is ‘70’ MPa. The coefficient of friction between the muff and the shaft surface may be taken as 0.3.