Reclining device for vehicle seat

A reclining device for a vehicle seat, the reclining device comprising:

• a flange having internal teeth at an inner circumferential surface thereof and a cylindrical-shaped flange protrusion at a center portion thereof;
• a gear plate having a through hole at a center portion thereof, wherein an outer diameter of the gear plate is smaller than an inner diameter of the flange, and the gear plate includes external teeth disposed along a circumference thereof and partially engaged with the internal teeth of the flange in an eccentric state with respect to the flange;
• an input device eccentrically positioned inside the through hole of the gear plate and having a rotating part configured to receive a rotational force through a shaft and a head part disposed at an end of the rotating part;
• a wedge cam positioned in a space between an inner circumferential surface of the through hole of the gear plate and the flange protrusion to maintain eccentricity of the gear plate;
• a support body positioned in the space between the inner circumferential surface of the through hole of the gear plate and the flange protrusion to be adjacent to a lateral side of the wedge cam, the support body being configured to support a load due to the eccentricity of the gear plate and to transmit the rotational force to the wedge cam, as being rotated by receiving the rotational force through the head part of the input device;
• and
• a spring positioned between the support body and the inner circumferential surface of the through hole to pressurize the wedge cam,
• wherein the support body has a ring shape and extends toward an inside of the wedge cam to cover the flange protrusion, and
• wherein in an area of an inner circumferential surface of the support body, the area being positioned outside opposite ends of the wedge cam, a recess portion is disposed at a part of the area and recessed outwards so that contact between the inner circumferential surface of the support body and an outer circumferential surface of the flange protrusion is prevented.