Meriam, Kraige & Bolton — Analysis of Structures: Problem 6_81

⚡ Mecademy AIENG정역학 · ch6  Problem Statement In the figure is shown a multiple-disk clutch designed for marine use. The driving disks are splined to the driving shaft so that they are free to slip along the shaft but must rotate with it. The disks drive the housing by means of the bolts , along which they are free to slide. In the clutch shown there are five pairs of friction surfaces. Assume the pressure is uniformly distributed over the area of the disks and determine the maximum torque which can be transmitted if the coefficient of friction is 0.15 and . Problem 6/81 (a) Maximum Transmissible Torque ● Calculation Process 1. Identify Given Data and Disk Geometry: Number of friction surface pairs: Coefficient of friction: Applied collar force: Outer diameter of friction disks: Inner diameter of friction disks: 2. Analyze the Lever Mechanism and Determine Axial Force : The lever is a bell crank pivoted at a radius of . It transmits force from the sliding collar (cone) to the disk pack. The lever tip is in contact with the cone at a radius of . Thus, the vertical distance from the pivot to the tip is . The lever heel pushes the disk pack at its inner radius (). The vertical distance from the pivot to the heel is . By taking moments about the lever pivot for the entire assembly, the horizontal force on the collar is related to the total axial force on the disks by the ratio of A B CDE M P=500 N n=5 μ=0.15 P=500 N D = o 150 mm⟹r = o 75 mm= 0.075 m D = i 100 mm⟹r = i 50 mm= 0.05