Motor

A motor comprising:

• a housing;
• a cover that covers the housing;
• a stator disposed inside the housing;
• a rotor disposed inside the stator;
• a rotary shaft coupled to the rotor;
• a bearing disposed on the cover;
• and
• a nut that is coupled to the cover and that is in contact with an outer ring of the bearing,
• wherein the cover incudes a first pocket accommodating the bearing and a second pocket that is disposed above the first pocket and to which the nut is rotation-coupled,
• the nut includes a body disposed to be lower than an upper surface of the cover and including a screw thread and an extension portion disposed to be higher than the upper surface of the cover,
• the body incudes a protrusion protruding outward from the screw thread, and
• the second pocket includes a first groove in which the protrusion is positioned,
• wherein the extension portion includes a second groove,
• wherein the cover includes a third groove connected to the second groove, and
• wherein the protrusion is disposed under a bottom surface of the third groove.