Abstract: Disclosed herein is an insert-molded ball joint which is configured such that rotational frictional torque of a ball stud is kept below the appropriate level, pull-out strength of the ball stud is increased, and play of the ball stud is minimized. The ball stud has a spherical head. The spherical head of the ball stud is rotatably inserted into the ball seat. The housing covers the ball seat and a portion of the spherical head that is exposed from the ball seat. The upper end of the ball seat is disposed higher than the center of the spherical head. The housing includes a head support which covers the spherical head. A ball seat grease groove is formed in the inner surface of the ball seat. Housing grease grooves are formed in the head support in a vertical direction and meet the upper end of the ball seat.

Abstract: Disclosed herein is a ball stud of a ball joint for a vehicle. The ball stud includes a ball stud body and an auxiliary flange plate. The ball stud body includes a spherical head, a neck provided on the spherical head, a flange provided on the neck, a connection part provided on the flange, and a threaded part which is coaxially provided on the connection part. A thread is formed on the threaded part. The threaded part has an outer diameter greater than a diameter of the connection part. The auxiliary flange plate is fitted over the connection part. A coupling hole is formed through a central portion of the auxiliary flange plate. The coupling hole has a diameter less than the outer diameter of the threaded part. The auxiliary flange plate has a support area greater than a support area of the flange.

Abstract: Disclosed herein is an insert-molded ball joint which is configured such that rotational frictional torque of a ball stud is kept below the appropriate level, pull-out strength of the ball stud is increased, and play of the ball stud is minimized. The ball stud has a spherical head. The spherical head of the ball stud is rotatably inserted into the ball seat. The housing covers the ball seat and a portion of the spherical head that is exposed from the ball seat. The upper end of the ball seat is disposed higher than the center of the spherical head. The housing includes a head support which covers the spherical head. A ball seat grease groove is formed in the inner surface of the ball seat. Housing grease grooves are formed in the head support in a vertical direction and meet the upper end of the ball seat.