Sleeve couplings

Sleeve couplings

• 2.
   Couplings areused to connect two shafts for torque transmission in varied applications.  Coupling may be rigid or they may provide flexibility and compensate for misalignment.  They may also reduce shock loading and vibration.
• 3.
  There are twomain types of couplings:  Rigid couplings  Flexible couplings Rigid couplings are used for shafts having no misalignment while the flexible couplings can absorb some amount of misalignment in the shafts to be connected.
• 4.
   One ofthe simple type of rigid coupling is a sleeve coupling which consists of a cylindrical sleeve keyed to the shafts to be connected.
• 5.
   It ismade of cast iron.  It consists of a hollow cylinder whose inner diameter is the same as that of the shaft (sleeve).  It is fitted over the ends of the two shafts by means of a gib head key.  The power is transmitted from one shaft to the other shaft by means of a key and a sleeve.
• 6.
   The muffor sleeve is made into two halves and are bolted together.  The halves of the muff are made of cast iron.  The shaft ends are made to a butt each other.  A single key is fitted directly in the keyways of both the shafts.  One-half of the muff is fixed from below and the other half is placed from above.
• 8.
   Both thehalves are held together by means of mild steel studs or bolts and nuts.  The number of bolts may be two, four or six.  The advantage of this coupling is that the position of the shafts need not be changed for assembling or disassembling of the couplings
• 10.
  The usual proportionsof a cast iron sleeve coupling are as follows : Outer diameter of the sleeve, D = 2d + 13 mm and length of the sleeve, L = 3.5 d where d is the diameter of the shaft.