The axial pressure on a single disc clutch (both sides of the disc is effective) is limited to 0.12 Mpa. This is designed for a vehicle with 13kW power at a speed of 700 rpm. Assume uniform wear conditions and a friction coefficient of 0.25. If the outer dimater of the disc is 1.25 times the internal diameter, determine the dimensions of the disc lining and the axial force exerted by the springs.

The axial pressure on a single disc clutch (both sides of the disc is effective) is limited to 0.12 Mpa. This is designed for a vehicle with 13kW power at a speed of 700 rpm. Assume uniform wear conditions and a friction coefficient of 0.25. If the outer dimater of the disc is 1.25 times the internal diameter, determine the dimensions of the disc lining and the axial force exerted by the springs.

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 7.73P: The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the...

See similar textbooks

Similar questions

The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the pressure in pounds per square inch (psi) and r represents the radial distance in inches. Determine the torque C required to operate the sander at constant speed if the kinetic coefficient of friction for the surface being sanded is 0.86.
A cone clutch is mounted on a shaft which transmits power at 200 rpm. The small diameter of the cone is 200 mm, the cone face is 50 mm and the cone face makes an angle of 12 degrees with the horizontal. Determine the axial force necessary to engage the clutch to transmit 7 kW if the coefficient of friction of the contact surfaces is 0.15. What is the maximum pressure on the contact surfaces assuming uniform wear?
the power transmitted by a single plate clutch at a speed of 2000 rpm, if the outer and inner radii of Triction surfaces -are 150 mm and 100 mm respectively. The maximum intensity of pressure at any point of contact surface should-not exceed 0.8 x 105 N/m2. Take both sides of the plate as effective and coefficient of friction = 0.3. Assume uniCalculateform wear.
The inner and outer radii of a hollow steel shaft are 50 mm and 100 mm, respectively. The hub of a steel gear wheel that is shrunk onto the hollow shaft has an outer radius of 150 mm. The maximum allowable tangential stress developed by shrinking the gear wheel onto the hollow shaft is 200 MPa. The length of hub parallel to the shaft axis is 200 mm, and the coefficient of static friction between the hub and the shaft is 0.40. Determine the maximum torque that may be transmitted by the gear wheel without slipping on the shaft.
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.
An automobile engine develops 25 kW at 1,000 rpm. The clutch used to transmit this power in a single plate clutch with two pairs of friction surfaces. The coefficient of friction is 0.4 and the mean diameter of the disk is to be 190 mm. If the maximum pressure limited to 200 kPa, calculate the face width
A flat belt with a width of 120 mm and a thickness of 5 mm transmits power from a driving pulley with a diameter of 250 mm to a driven pulley with a diameter of 700 mm. The mass per unit length of the belt is 2.1 kg/m, and the coefficient of friction is 0.25. The input power of the belt is 60 kW at 1000 rpm. Calculate the following when the center distance is 3.5 m. (a) Maximum tensile stress of the belt(b) Axial load on each pulley
Determine the axial spring force necessary to engage the clutch, when an engine developing 30kW at 500 r.p.m. is fitted with a cone clutch built inside the flywheel. The cone has a face angle of 13.5o and a maximum mean diameter of 300 mm. The coefficient of friction is 0.25. The normal pressure on the clutch face is not to exceed 0.1 N/mm2
High-strength bolts are used in the construction of many steel structures. For a 1-in.-nominal-diameter bolt, the required minimum bolt tension is 51 kips. Assuming the coefficient of friction to be 0.30, determine the required couple that should be applied to the bolt and nut. The mean diameter of the thread is 0.94 in., and the lead is 0.125 in. Neglect friction between the nut and washer, and assume the bolt to be square-threaded.
The belt drive in which pulleys rotate in the same direction is used to transfer power. The pulley diameters are 1.74m and 0.833m and it connects two parallel shafts which are 3.25m apart. The initial tension in the belt when it is stationary is 4500N. The smaller pulley is rotating at 710 rpm and coefficient of friction between the belt and pulley is 0.29. Determine the power transmitted by the belt drive
An elevator type lift is being designed to raise a load up to 5,000pounds between floors. Two square-thread lead screws, 1.5 inches in (major) diameter, are used for this application. Determine the torque required to raise this lift if the moving part of the elevator weighs 800 pounds and the coefficient of friction is assumed to be 0.15. For the elevator described, find the efficiency and power required if each lead screw is driven at 175 rpm. Verify if this is self locking.
A single disc clutch with both sides effective is required for a vehicle. The power for initial estimation of the clutch is 100 kW at 4000 rpm. Determine the radial dimensions (inner and outer radius) and the actuating force (W). Base the design on the uniform wear assumption. Assume maximum pressure (pmax) as 1.6 MN/m2 and ?2?1= 1√2where ‘r2’ and ‘r1’ represent inner and outer radius of the friction surface. Take µ = 0.35. Find also the minimum pressure (pmin).