Seat recliner for vehicle

A seat recliner for a vehicle, the seat recliner comprising:

• a first flange including a plurality of guide parts disposed on an upper surface of the first flange, and a first through hole formed in a center portion of the first flange, wherein guide parts of the plurality of guide parts are spaced apart from each other along a circumferential direction of the first flange such that a plurality of guide spaces are defined between the guide parts of the plurality of guide parts;
• a plurality of lock gears configured to slide along the plurality of guide parts, respectively such that lower surfaces of the plurality of lock gears are seated on corresponding guide spaces of the plurality of guide spaces when assembled, wherein the plurality of lock gears respectively include a guide protrusion provided on an upper surface of the plurality of lock gears and a plurality of outer teeth provided on an outer end surface thereof;
• a lock cam disposed on the center portion of the first flange, and configured to compress inner end surfaces of the plurality of lock gears as the lock cam is rotated so that the plurality of lock gears slide outward, the lock cam including a second through hole formed in a center portion of the lock cam;
• a control part disposed on the upper surfaces of the plurality of lock gears and the lock cam, and including:
• a third through hole formed in a center portion of the control part, and
• a guide slit configured to receive and guide a guide protrusion of the plurality of lock gears;
• and
• a shaft configured to penetrate through the first through hole, the second through hole, and the third through hole, and configured to rotate along with the lock cam and the control part,
• wherein a first locking structure is formed on an outer circumferential surface of the shaft, a second locking structure is formed on an inner circumferential surface of the lock cam defining the second hole, and a third locking structure is formed on the inner circumferential surface of the control part defining the third through hole, so that the shaft, the lock cam, and the control part are engaged with each other in a desired direction.