For a plate clutch under uniform wear, keep the outer friction radius, maximum allowable contact pressure, coefficient of friction and operating speed fixed. What inner-to-outer radius ratio maximizes torque and hence power capacity?
0.58
Uniform wear gives \(pr=p_{max}r_i\). For a fixed number of active surfaces, torque is proportional to \(r_i(r_o^2-r_i^2)\). Differentiating with respect to \(r_i\) gives \(r_o^2-3r_i^2=0\), hence \(r_i/r_o=1/\sqrt3\approx0.577\approx0.58\).
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
