The disc clutch has a pair of mating friction surfaces, with an outer diameter of 350 mm and an inner diameter of 250 mm. The average value of the coefficient of friction is 0.25, and the operating force is 5 kN. Find the torque capacity when the clutch is new, the maximum pressure and the torque capacity after a sufficiently long operating period

The disc clutch has a pair of mating friction surfaces, with an outer diameter of 350 mm and an inner diameter of 250 mm. The average value of the coefficient of friction is 0.25, and the operating force is 5 kN. Find the torque capacity when the clutch is new, the maximum pressure and the torque capacity after a sufficiently long operating period

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 7.56P: The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The...

See similar textbooks

Similar questions

The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.
The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of the screw are threaded in opposite directions (right- and left-handed threads). The coefficient of static friction between the threads is 0.08. Calculate the torque C0 that must be applied to the screw in order to start the 1200-1b load moving (a) upward; and (b) downward.
The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The coefficient of static friction between the threads is 0.2. If the torque C=1.50Nm is used to tighten the clamp, determine (a) the clamping force; and (b) the torque required to loosen the clamp.
The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
The test specimen AB is placed in the grip of a tension-testing machine and secured with a wedge. The coefficient of static friction at both surfaces of the specimen is s. If the wedge angle is =18, determine the smallest s for which the grip is self-locking (no slipping takes place regardless of the magnitude of the force P). Neglect the weight of the wedge.
A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.
Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at r=0 to zero at r=R; that is, p=p0(1r2/R2).
A cone clutch with a cone angle of 12° transmits 53 kW at 1300 rpm. The coefficient of friction of linings is 0.16. Determine the axial spring force necessary to engage the clutch in N if the mean diameter of the active conical sections is 250 mm.
A cone clutch has cone elements at an angle of 12o. The clutch transmit 25 HP at a speed of 1200 rpm. The mean diameter of the conical friction section is 16 in and the coefficient of friction is 0.35. Find the axial force needed to engage the clutch.
A multiple disc clutch is used to operate the speed regulating gears of lathe. If the torque delivered by the clutch is 400 lbs.in , evaluate the number of discs are necessary and the max. force acting on them while the clutch is in operation. Limit the disc friction surface sizes between 5 in. and 3 in. Take the factor of safety as 2 , coefficient of friction varies from 0.150 to 0.200, and the pressure as (100-6/100)psi.
A multiple disc clutch is used to operate the speed regulating gears of lathe. If the torque delivered by the clutch is 400 lbs. in.,evaluate the number of discs are necessary and the max. force acting on them while the clutch is in operation. Limit the disc friction surface sizes between 5 in. and 3 in. Take the factor of safety as 2 , coefficient of friction varies from 0.150 to 0.200, and the pressure as (100-24/100) psi.