Starting device

A starting device, comprising:

• a fluid coupling;
• an electric motor including a rotor and a stator, the rotor disposed radially outside the fluid coupling, the stator disposed radially outside the rotor;
• and
• a restriction mechanism configured to restrict relative rotation between the fluid coupling and the rotor,
• wherein the restriction mechanism includes a first key groove provided on an inner peripheral surface of the rotor so as to extend in an axial direction;
• a second key groove provided on an outer peripheral surface of the fluid coupling so as to extend in the axial direction, the second key groove being lesser in length than the first key groove;
• and a key body including a first key portion and a second key portion, the first key portion being fitted to the first key groove and the second key portion being fitted to the second key groove,
• wherein the rotor and the fluid coupling are rotationally positioned relative to each other such that the first key groove and the second key groove are circumferentially aligned with each other, and
• the key body fits within both circumferentially aligned grooves so as to prevent relative rotation between the rotor and the fluid coupling.