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- Compute the contact stress number for the gear fain pair driven directly by an electrical motor. The driven machthe is concrete mixture with moderate shock, the other data are given below. Ks= 1.00, Km 1.21, Vt =1527 St/min, Av-11 Pd= 6, np= 1750rp.m, Np 20, No= 70, F=2.00/n Tp = 900ib, Dp= 3:333 in The material used for pioin an gear is Steelcampute the bending stress number for the goer pair described by the given data beLow. KS= 1, Km= 1,21, F= 2.00 in, DP= 3,33 in, NG= 70, Np=20 hp = 1750v. p.m, Av=11, Pd =6, Tp= 900ib V1= 1527 ft/min The matarial used for pinion a gear is cast ironA jaw clutch for a 4 3/16 in shaft hasthree jaws with radial forces. The insidediameter is 4 3/8" outside diameter is 11 1/2 in and axial height of jaws is 2 in.The working stress in the shaft is 6,000psi. What is the bearing stress in jawfaces? Ans:1020 psi
- The pedal system shown in the figure is exerted by both an up and down mechanism. These forces are Fmax=350*SN/10 N, Fmin=-150*SN/10 N. It is desired that h/b = 5 seen in the figure. This piece is AISI 1040 and has a maximum tensile stress of 670Mpa and a yield stress of 540Mpa. Known weakening factors are known as kb=ky=kd=0.8. The notch factor for all stresses is assumed to be Kç=1.5. It is desired to last up to its minimum indefinite life at the cross-section measurement point (bxh) shown in the figure. According to Goodman theory, what should be the minimum size (b and h value) of this section in order to meet this condition. SN=89A keyed sprocket delivers a torque of 778.8 N-m thru the shaft of 54 mm OD. The key thickness is 1.578 cm and the width is 1.11 cm. Compute the length of the same key. The permissible stress value of 60 MPa for shear and 90 MPa for tension. (Ans: 4.33 cm)ANSWER ASAP The worm gear rotating at 1250 rpm drives a worm wheel and whose velocity ratio is 12 to 1. A driving motor with 12 hp is used to supply the worm with worm pitch gear diameter of 3.5 in. Find the tangential force on the gear.
- 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.Design a typical rigid flange coupling for connecting a motor and a centrifugal pump shafts. The coupling needs to transmit 15 KW at 1000 rpm. The allowable shear stresses of the shaft, key and bolt materials are 60 MPa, 50 MPa and 25 MPa respectively. The shear modulus of the shaft material may be taken as 84GPa. The angle of twist of the shaft should be limited to 1 degree in 20 times the shaft diameter. Note: show complete solutionA semi-elliptic spring used for automobile suspension, consists of twoextra full-length leaves and eight graduated-length leaves, including themaster leaf. The centre-to-centre distance between the two eyes is 1 m.The leaves are made of steel 55Si2Mo90 (S = 1500 N/mm yt2 andE = 207 000 N/mm2) and the factor of safety is 2. The maximum springload is 30 kN. The leaves are pre-stressed so as to equalize stresses in allleaves under maximum load. Determine the dimensions of thecross-section of the leaves and the deflection at the end of the spring.
- Design a plain carbon steel centrecrankshaft for a single acting four strokesingle cylinder engine for the following data:Bore = 400 mm; Stroke = 600 mm; Enginespeed = 200 rpm; Mean effective pressure =0.5 N/mm2; Maximum combustion pressure= 2.5 N/mm2; Weight of flywheel used as apulley = 50 kN; Total belt pull = 6.5 kN. Theratio of the connecting rod length to thecrank radius is 5. Assume the crank is at topdead centre. Assume any other datarequired for the designThe values given for a radial plain bearing are:Shaft diameter = 40 mm, bearing width = 30 mm, Pem = 6 N / mm2, Radial force = 2 KN, Ty = 45 C, oil: ISO VG 15, bearing clearance = 35 µm, dynamic viscosity for given oil and temperature = 12 m Pa. sRequired:a) What is the working cycle of the shaft?b) Find the Sommerfeld number.Two cqual involute gear wheels of 40 teeth each, 3 mm module and 20° pressures angleare in mesh. Determine the minimum addendum if 2 pairs of teeth are always in mesh.The gear wheels rotate at 750 r.p.m. and transmit 4.6 kW. Find the normal force at eachpair assuming equal direction of load between the pairs. Neglect friction.