Monday, April 23, 2018

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2.7. COUPLINGS

2.7.1. GENERAL
Introduction :
• Couplings are used to transmit starting torque from the accessory gear to the gas turbine axial compressor and to transmit shaft horsepower from the turbine to the generator.
• Simplified cutaway view.

Accessory Gear Coupling

Accessory_Gear_Coupling


2.7.2. ACCESSORY GEAR AND LOAD COUPLING
Accessory gear coupling :
An oil filled flexible coupling is used to connect the accessory drive to the gas turbine shaft at the compressor end. The coupling is designed to transmit the starting and driving torque
associated with this drive coupling as well as provide flexibility to accommodate nominal misalignment and axial movement of the turbine rotor relative to the accessory gear box.

There are three types of misalignment that is accommodated by the coupling : angular, parallel and a combination of both.

Load coupling:

A rigid, hollow coupling connects the turbine rotor shaft to the generator. A bolted flange connection forms the joint at each end of the coupling.

Oil-Filled Accessory Gear Coupling Assembly

Oil-Filled Accessory Gear Coupling Assembly

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