Friction in Bearing

2. • Friction in Journal Bearing
• Friction of Pivot and Collar Bearing
Previous lecture
T = W.r tan φ = μ.W.r

3. • Conical Pivot Bearing
• Trapezoidal or Truncated Conical
Pivot Bearing
• Flat Collar Bearing
• Conical Collar Bearing
Today’s lecture

4. Flat Pivot Bearing
Considering uniform wear:
the rate of wear depends upon the intensity of pressure (p) and the
velocity of rubbing surfaces (v). It is assumed that the rate of wear is
proportional to the product of intensity of pressure and the velocity of
rubbing surfaces (i.e. p.v..). Since the velocity of rubbing surfaces
increases with the distance (i.e. radius r) from the axis of the bearing,
therefore for uniform wear

5. Pivots and Collars
Pivots Bearing
Collars Bearing

6. Flat Collar Bearing

7. Flat Collar Bearing
Uniform pressure
Considering uniform pressure
Substituting the value of p

8. Flat Collar Bearing
Uniform wear
Considering uniform wear
Substituting the value of C

9. Conical Collar Bearing
Considering an elementary area of small width dr at radius r.

10. Conical Collar Bearing

11. Conical Collar Bearing
Uniform pressure

12. Conical Collar Bearing
Uniform wear

14. Next lecture
• Friction Clutches

15. Contact details:
Rohit Kumar Singla
Email ID: rohit.kumar@thapar.edu