The outer ball joint of the steering gear serves as a key connecting component of the steering system, with one end connected to the tie rod and the other end connected to the steering knuckle arm. It not only needs to transmit steering force, allowing the steering wheel to drive the wheels to turn, but also adapt to the angle changes of the wheels when the vehicle bumps or turns, ensuring precise steering and smooth driving. The outer ball joint in the car steering system is an important force transmission component between the tie rod and the steering knuckle arm. Its function is to convert the steering action of the steering wheel into wheel deflection force, and to compensate for the dynamic displacement angle of the wheels, avoiding steering lag or instability during driving.