Patent ID: 7309208

Claim:
A turning gear assembly for turning a turbine rotor comprising: a motor configured to produce a first rotational output at a first speed; a clutch assembly in mechanical communication with said motor, said clutch assembly comprising: an overspeed clutch disposed at an input shaft; an output shaft in mechanical communication with said input shaft via said overspeed clutch; a centrifugal clutch disposed at a portion of said output shaft; and a housing disposed proximate to at least a portion of said centrifugal clutch; a reduction gear assembly in mechanical communication with said clutch assembly, said reduction gear assembly configured to produce a second rotational output at a second speed in response to receiving said first rotational output from said motor via said clutch assembly, said second speed being lower than said first speed, said reduction gear assembly configured to translate said second rotational output to the turbine rotor in response to engagement of said reduction gear assembly to the turbine rotor; and a disengagement assembly configured to allow disengagement of said reduction gear assembly from the turbine rotor.