Patent ID: 9719554
Date: 2017-08-01
CPC Classifications: F16C,Y10T

Claim:
1. A ball joint, comprising: a ball; a resin sliding contact member having a sliding contact surface held in sliding contact with the ball, for covering a largest diameter portion of the ball, the resin sliding contact member comprising a first opening portion and a second opening portion that expose a spherical surface of the ball in opposite directions; a holder formed through casting by using, as a core, the ball and the resin sliding contact member mounted so as to cover the ball, the holder comprising: a shaft member joined to the another part of the spherical surface of the ball, which is exposed from the first opening portion of the resin sliding contact member, through electric resistance welding after the casting of the holder, to thereby construct a ball stud, wherein the resin sliding contact member covers the largest diameter portion of the ball, wherein an inner diameter of the second opening portion is set to be smaller than an inner diameter of the first opening portion, and wherein the inner diameter of the second opening portion of the resin sliding contact member is set so that an area of the part of the spherical surface of the ball, which is held in contact with the closing portion of the holder through the second opening portion, is larger than an area of a portion in which the shaft member is welded to the ball.