Patent attributes
A dust cover is provided that is attached to a ball joint in which a spherical portion in a stud having the spherical portion and a shaft is accommodated in a socket and a knuckle is fastened into the shaft and is provided with a large diameter opening fixed to the outer peripheral surface of the socket, a small diameter opening attached to the shaft part of the stud, and a film portion connecting the large diameter opening and the small diameter opening. The small diameter opening is provided with a seal portion in close contact with the outer peripheral surface of the shaft and a contact portion in close contact with the knuckle. In the contact portion, a foreign matter discharge groove discharging external foreign matter which tends to accumulate on the small diameter opening to the outside are formed.
