Clutch coupling

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Logo of the German Institute for Standardization DIN 115
Area Drive elements
title Shell couplings
Brief description: Part 1: Dimensions, torques, speeds; Part 2: inlay rings
Latest edition 9.1973
ISO -
Visualization of a shell coupling

The shell coupling is a special type of coupling . It is suitable for medium and light loads and consists of two identical shell halves that are pressed onto the two shaft ends using connecting screws. The shell coupling belongs to the group of rigid couplings. It is a non-switchable clutch. In Germany, shell couplings are standardized in DIN 115 .

construction

The shell coupling consists of two shell halves of the same size. The two halves are clamped together with screws. Two shafts can be frictionally connected with the shell coupling . The typical shell coupling has no feather keys or spring wedges. The torque transmission is purely frictional.

In addition to the typical shell coupling, there are various models with feather keys, with spring wedges or reinforced clamping surfaces, typically with shaft diameters larger than 55 mm. What they all have in common, however, is that they consist of two halves and thus enable simple assembly.

Technical specifications

  • An exact match of the shaft diameter is necessary for a reliable fit.
  • The shaft seats should have a tolerance of h9.
  • Clamp clutches are usually used up to a speed of 4000 min −1 and a torque of up to 2500 Nm.

Typical properties

  • The coupling does not have to be threaded over the shaft for assembly: the two-shell half construction can be assembled without changing the shaft positions (no dismantling of the shaft)
  • Non-positive connection (no feather key is used for power transmission)
  • Suitable for medium and light loads (unsuitable for changing or shock loads)
  • Wear-free, maintenance-free, applicable for both directions of rotation
  • To reduce the risk of accidents, the coupling is covered with a sheet metal jacket
  • The screw heads and nuts are countersunk and are arranged alternately to avoid imbalance

Application examples

  • Use as a predetermined breaking point (overload protection fuse)
  • Connection of two shafts of the same size (simplifies assembly)
  • Connection of waves to transmission waves
  • Undercarriage shafts of cranes
  • Connection of turbine shafts with dynamo shafts in power plants
  • Connection between motor shaft and gear