Slip ring device and rotary electric machine using the same

A slip ring device comprising:

• a slip ring shaft provided separately from a rotor shaft;
• a first slip ring and a second slip ring, both of which being put from both ends of said slip ring shaft, respectively, said first slip ring being attached by shrink-fitting to a first slip ring attaching portion of said slip ring shaft, and said second slip ring being attached by shrink-fitting to a second slip ring attaching portion of said slip ring shaft;
• a lead connecting portion which is located between the first slip ring attaching portion and the second slip ring attaching portion in said slip ring shaft and is formed to be a shaft diameter larger than the shaft diameters of the first slip ring attaching portion and the second slip ring attaching portion of said slip ring shaft;
• a first radial lead and a second radial lead, said first radial lead being placed in a first radial lead placing hole and said second radial lead being placed in a second radial lead placing hole, said radial lead placing holes being formed in the lead connecting portion;
• a first axial lead and a second axial lead, both of which being placed in a hollow hole formed in a central portion of said slip ring shaft, said first axial lead being connected to said first radial lead and said second axial lead being connected to said second radial lead;
• a first slip ring lead which is connected to said first slip ring and to said first radial lead;
• a second slip ring lead which is connected to said second slip ring and to said second radial lead;
• and
• a coupling which is attached by shrink-fitting to a shaft end portion on the rotor shaft side of said slip ring shaft after said first slip ring is attached by shrink-fitting.