azg missionruende

Semi-Rigid Clutches

The semi-​rigid clutch is suitable for installation where shaft alignment is closely controlled. It can engage with some misalignment, but will act virtually as a solid coupling when engaged. It can be in-​line or quill shaft mounted. It also can transmit very high powers, and has high overspeed and overload capacity. It has a higher torque capacity than spacer type clutches, and it has low drag torque when disengaged. Most of the parts of the clutch are connected to the turbine and are stationary when the turbine is at rest. Lubrication oil for the clutch is taken from the main plant lubrication system.

The largest SSS Semi-Rigid Clutch in service transmits 321MW at 3,000 RPM.


  • Internal thrust bearing to locate output shaft from input shaft.
  • Visual mechanical and/or electrical indication of the clutch engaged/disengaged positions.
  • Electrical insulation can be incorporated into the clutch output flange.
  • Clutch lock-​in to prevent disengagement after automatic engagement so a gas turbine can be accelerated from the generator.
  • The clutch can be supplied in a casing containing bearings if required.