Knuckle Joint Single eye or Rod end Double

Knuckle Joint

Single eye or Rod end

Double eye or Forked end

Pin

Collar

Lock pin

Diagram For design procedure

Notations P = Tension in Rod d = diameter of rod d 1 = diameter of pin d 2 = Outer diameter of eye d 3 = diameter of Pin head t = thickness of rod end (single eye) t 1 = thickness of forked end (double eye) t 2 = thickness of Pin head and thickness of collar

Step 1. Design of Rod (d) Tensile failure of rod find diameter of rod

Step 2. Decide other dimensions using empirical relations Dia. of knuckle pin = d 1 = d Outer dia of eye = d 2 = 2 d Dia. of knuckle pin head & collar d 3 = 1. 5 d Thickness of single eye or rod end d t = 1. 25 Thickness of fork d t 1 = 0. 75 Thickness of pin head d t 2 = 0. 5

Step 3. Check stresses in pin Double shear failure of pin, Check If fs(induced)<fs (allowable). . . Design is safe

Step 4. Check stress in single eye A) Shear Failure of single eye (rod end) Check stress

B) Tensile Failure of single eye (rod end) Check stress

C) Crushing Failure of single eye (rod end) Check stress

Step 5. Check stress in Double eye A) Shear Failure of Double eye (Forked end) Check stress B) Tensile Failure of Double eye (Forked end) Check stress C) Crushing Failure of Double eye (Forked end) Check stress