Patent ID: 7850532

Claim:
A generator, comprising: a main rotor shaft supported within a housing of the generator, a stub shaft having an inside portion situated inside the main rotor shaft and an outside portion projecting outside the main rotor shaft; the stub shaft being vulnerable to failure in a mode in which the inside portion and the outside portion separate from one another so that the separated internal portion may be driven axially into the main rotor shaft; the stub shaft having a splined engagement with the main rotor shaft: a plug for retention of a lubricant; the plug having an aperture therethrough for passage of limited amount of the lubricant so that the splined engagement is lubricated; and the plug being positioned inside the main rotor shaft and facing a distal end of the inside portion of the stub shaft, the plug press fit into the main rotor shaft lightly enough that when the separated internal portion of the stub shaft moves axially through the main rotor shaft to displace the plug.