Coupler and motor assembly including same

A coupler comprising:

• an inner insertion part;
• and
• an outer support part configured to surround the outside of the inner insertion part,
• wherein the inner insertion part includes a cylindrical-shaped protruding part having a through hole disposed at a center thereof and a polygonal-shaped plate configured to extend in a radial direction from an outer circumferential surface of the protruding part,
• wherein the outer support part includes an accommodation part coupled to the plate, a cylindrical outer wall configured to extend from an edge of the accommodation part, and a plurality of projection parts configured to extend toward the protruding part from an inner side of the outer wall,
• wherein the plate includes a plurality of connection grooves, and
• wherein the accommodation part is partially disposed in the connection groove.

A motor assembly comprising:

• a rotary shaft;
• a rotor including a hole in which the rotary shaft is disposed;
• a stator disposed at an outer sides of the rotor;
• a housing configured to accommodate the rotor and the stator;
• and
• a coupler coupled to the rotary shaft,
• wherein the coupler includes an inner insertion part and an outer support part configured to surround the outside of the inner insertion part,
• wherein the inner insertion part includes a cylindrical-shaped protruding part having a through hole disposed at a center thereof and a polygonal-shaped plate configured to extend in a radial direction from an outer circumferential surface of the protruding part,
• wherein the outer support part includes an accommodation part coupled to the plate, a cylindrical outer wall configured to extend from an edge of the accommodation part, and a plurality of projection parts configured to extend, toward the protruding part from an inner side of the outer wall,
• wherein the plate includes a plurality of connection grooves, and
• wherein the accommodation part is partially disposed in the connection groove.