The effective radius of the pads in a single collar thrust block is 230 mm and the total load on the thrust block is 240 kN when the shaft is running at 93 rev/mm. Taking the coefficient of friction between thrust collar and pads to be 0.025, find (i) the power lost due to friction, (ii) the heat generated per hour, iii) the mass flow of oil in kilograms per hour through the block assuming all the heat is carried away by the oil, allowing an oil temperature rise of 20°C and taking the specific heat of the oil to be 2 kJ/kg k.

Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? give proper explaination and dont give handwritten solution.

A conical clutch has an included angle of 120°, a coefficient of friction of 0.4, and outer and inner diameters of 85mm and 18mm respectively.   Using both the uniform wear theory and the uniform pressure theory, calculate the force required to press the two halves together if it is to transmit 300W at 750rev/min.   The uniform wear theory and the uniform pressure theory deliver different values for torque in the same system. Which theory would be preferred in practice for use in calculations involving a friction clutch? Give reasons for your choice.

In a wheel and differential axle type of lifting machine, a crank handle of 240 mm radius takes the place of the wheel and the diameters of the differential axle are 110 mm and 80 mm respectively. If an effort of 80 N is required at the handle to lift a load of 1.12 kN, find the velocity ratio, mechanical advantage and efficiency at this load.

A multiple V-belt drive is required to transmit 4 kW. The smaller pulley of the system is150 mm diameter, rotates at 200 rev/min, and has an angle of lap angle of 135°. Thegrove angle is 40° and the coefficient of friction between the belt and the pulleys is 0·3.If the maximum tension in any one belt is limited to 800 N, calculate:(a) The number of belts required. (b) The minimum tension in any one belt. (c) The required pre-tensioning of the belt. The centre-to-centre distance between the pulleys is 2 m.(d) Determine to the nearest mm, the required size for the larger pulley.(e) Find the approximate length of the belt

Consider the centrifugal clutch above that comprises of four ‘shoes’ symmetrically attached to the ‘spider’.  Each shoe with its friction lining has a mass of 275 grams and is attached by means of a linear mechanical spring with a stiffness value of 7.5 kN/m.  The coefficient of friction of the material attached to the shoes is 0.35.  The centre of mass of each of the shoes is at a radius of 95 mm from the shaft centres in the rest position shown above and has a clearance distance of 9 mm to the outer drum.  The outer drum has a wall thickness of 4 mm.   Question 1 a. Determine the engagement speed of the centrifugal clutch.  You should provide your answer in RPM (revolutions per minute) and rounded to the nearest whole value of RPM.  b. Calculate the radial force acting on the clutch face when the driving shaft is rotating at a speed of 550 RPM.  c. At the driving shaft speed of 550 RPM, what will be the value of torque transmitted to the driven shaft?    Please not all equations used

Consider the centrifugal clutch above that comprises of four ‘shoes’ symmetrically attached to the ‘spider’.  Each shoe with its friction lining has a mass of 275 grams and is attached by means of a linear mechanical spring with a stiffness value of 7.5 kN/m.  The coefficient of friction of the material attached to the shoes is 0.35.  The centre of mass of each of the shoes is at a radius of 95 mm from the shaft centres in the rest position shown above and has a clearance distance of 9 mm to the outer drum.  The outer drum has a wall thickness of 4 mm.   Question 1 a. Determine the engagement speed of the centrifugal clutch.  You should provide your answer in RPM (revolutions per minute) and rounded to the nearest whole value of RPM.  b. Calculate the radial force acting on the clutch face when the driving shaft is rotating at a speed of 550 RPM.  c. At the driving shaft speed of 550 RPM, what will be the value of torque transmitted to the driven shaft?    Please note the equartions…

Clutch Mechanism 8. In the clutch mechanism shown, two flat circular disks of radius R are mounted so that they can be brought into contact causing a net frictional force. The contact pressure in general depends on the distance from the center and in one specific case may be modeled buy P(r) = Poe-kr, where k is a constant and r is the distance from the center of the discs. The integral cR F = 2m " P(r)rdr gives the total contact force between the discs. Cross-section a. In your own words explain where this formula comes from.

A multiple vee-belt drive is required to transmit 4 kW. The smaller pulley has of the systemhas a diameter 150 mm and rotates at 200 rev/min. The grove angle is 40° and thecoefficient of friction between the belt and pulley is 0·3.(a) If the maximum tension in any one belt is limited to 800 N and the angle of lap is135°, determine the number of belts required. (b) Determine also, the initial pre-tension required in the belt.

A pulley 500 mm diameter is driven at 375 rev/min by a belt 200 mm wide by 12 mm thick. The tension in the tight side of the belt is three times the tension in the slack side. Calculate the maximum power that can be transmitted if the stress in the belt is not to exceed 400 kN/m2, neglecting the stress set up in the belt due to centrifugal force.