3. Two shafts whose centers are 1 m apart are connected by a V-belt drive. The driving pulley is supplied with 100 kW and has an effective diameter of 300 mm. It runs at 1000 r.p.m. while the driven pulley runs at 375 r.p.m. The angle of groove on the pulleys is 40°. The permissible tension in 400 mm2 cross-sectional area belt is 2.1 MPa. The density of the belt is 1100 kg/m3. The coefficient of friction between the belt and pulley is 0.28. Estimate the number of belts required. Answer. 10

3. Two shafts whose centers are 1 m apart are connected by a V-belt drive. The driving pulley is supplied with 100 kW and has an effective diameter of 300 mm. It runs at 1000 r.p.m. while the driven pulley runs at 375 r.p.m. The angle of groove on the pulleys is 40°. The permissible tension in 400 mm2 cross-sectional area belt is 2.1 MPa. The density of the belt is 1100 kg/m3. The coefficient of friction between the belt and pulley is 0.28. Estimate the number of belts required. Answer. 10

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.70P: Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at...

See similar textbooks

Similar questions

Repeat Problem 11.2-3 assuming that R= 10 kN · m/rad and L = 2 m.
Two shafts, one solid the other one hollow, are connected end to end by meansof a coupling in which there are 8 screws on the pitch diameter D = 250 mm.The solid shaft has diameter d = 50 mm and transfers the power P = 500 kW at 75 rev/s.The external diameter of the hollow shaft is dex = 75 mm.Note: All parts of the system must be equally strong, and able to transfer the requiredpowerCalculate:(a) The internal diameter di of the hollow shaft(b) The diameter of the bolts db connecting the two shafts(c) If the hollow shaft has to be replaced by a rectangular hollow cross-section withouter dimensions b x h and uniform wall thickness of 4 mm.Calculate the values b, h while following the request to keep h = 2b
....An electric motor drives a compressor by use of V-belt. The angle of contact on the smaller pulley is 2.89 rad and the belt speed runs at 29.36 m/s. The groove angle of the pulleys is 35°. Determine the tension in the slack side of the belt in N if the belt has a cross-sectional area of 366 mm2, density 1000 kg/m3, and an allowable tensile stress of 2.3 MPa. The coefficient of friction between the belt and the pulley is 0.3
Two parallel shafts whose centre lines are ‘5’ m apart, are connected by an open belt drive. The diameter of the larger pulley is ‘3’ m and that of smaller pulley ‘3’ m. The initial tension in the belt when stationary is ‘4’ kN. The coefficient of friction between the belt and the pulley is 0.3. Calculate the power transmitted, when the smaller pulley rotates at ‘700’ r.p.m. and length of the belt.
In an open flat belt drive, a pulley of 800 mm diameter runs at 300 r.p.m. The coefficient of friction between the belt and the pulley is 0.25, the angle of lap is 170° and the maximum tension in the belt is 2000 N. The power transmitted is: 10.5 kW 9.4 kW 8.9 kW 7.6 kW None of the mentioned 13.1 kW
For a 90° V-twin engine system, having two identical cylinder with center line of each cylinder being inclined at 45° to vertical, the speed is 2400 rpm. The reciprocuting mass per cylinder - 1.5 kg stroke=14 cm length of connecting rod -28 cm. Find the values of max. primary and secondary Forces and indicate whether the same the can be balanced by suitable means.
PROBLEM The diameter of two pulleys are (0.3m)and (0.2m), center distance (1m).if we use open belt drive. Determine: 1- the length of V-belt (2ß = 60°). 2- the contact angle between belt and smaller pulley. 3- the horse power, if the smaller pulley turn with speed (400r.p.m) and the tension force in tight side (T1=900N), coefficient of friction ų=0.3 4- the speed of large pulley.
A turbine is connected to a generator by means of flange coupling that has a bolt circle diameter of 20 in. The generator output is 40 Hp, 3600 rpm and 90% efficiency. If there are 10 bolts, determine the force acting on each bolt in kN.
Two pulleys, one 425mm diameter and the other 210mm diameter are one parallel shaft 2m apart and are connected by a crossed flat belt. Find the length of the belt required and the angle of conduct between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 200 rev/min, if the maximum permissible tension in the belt is 1 kN, and the coefficient of friction between the belt and pulley is 0.3?
a) A single cylinder reciprocating engine has a stroke 40cm and the crank makes 250 r.p.m. The reciprocating parts mass is 60kg and the mass of the revolving parts at 20cm radius is 40kg. If two-thirds of the reciprocating mass and all the revolving mass is to be balanced, what is the balancing mass at a radius of 40cm and what is the residual unbalance force when the crank is at 60º from the top dead centre. b) A shaft is supported at bearing at A and B, 2m apart. A rotor of total mass 30kg is mounted at a point 0.6m from bearing A. Owing to faulty mounting the centre of gravity of the rotor is offset 3mm around the axis of rotation. Calculate the dynamic loads on the bearings when the shaft rotates at 600rev/min. calculate also the maximum and minimum loads on the bearings.
A solid steel shaft, whose Sy= 300 MPa and Su= 400 MPa, is used to transmit 3000 kW at 800 rpm. Determine its diameter.
A pulley 610 mm diameter is driven at 300 revs/min by a belt, the tensions in the tight and slack sides of the belt being 670 N and 270 N. Find the power transmitted.