A disc clutch with one active annular friction interface transmits 5 kW at 2000 rpm. The friction coefficient is 0.25, the inner friction radius is 25 mm, and uniform contact pressure is 1 MPa. What outer friction radius is required, approximately?
39.4
Required torque is \(T=5000/[2\pi(2000/60)]=23.8732\ \mathrm{N\,m}\). For one interface at uniform pressure, \(T=(2\pi/3)\mu p(r_o^3-r_i^3)\). Substituting μ = 0.25, p = 10⁶ Pa and ri = 0.025 m gives ro = 39.41 mm ≈ 39.4 mm.
Important Questions from Friction Clutches
Which of the following statement is CORRECT about the dry clutch?
- In a multiple disc clutch, if there are 4 discs on the driving shaft and 3 discs on the driven shaft, then the number of pairs of contact surfaces will be equal to _______.
In designing a plate clutch, assumption of uniform wear conditions is made because:
A single plate clutch has outer and inner radii 50 mm and 20 mm respectively. An axial clamping force required to engage the clutch is 2 kN and coefficient of friction between liner material is 0.4, the torque carrying capacity of the clutch using uniform wear theory is
Match List-I with List-II and select the correct answer using the codes given below the lists.
List - I List - II J. Single-plate clutch 1. Scooters K. Multi-plate clutch 2. Rolling mills L. Centrifugal clutch 3. Trucks M. Jaw clutch 4. Mopeds
