The automatic pressure-regulating tyre for car includes outer hub, inner hub, elastic metal ring and drive shaft, the outer hub, inner hub and elastic metal ring exterior are equipped with seal band respectively, on the outer hub a tube sleeve is set, the middle of the bottom portion of the tube sleeve is equipped with spline groove, interior of the tube sleeve is equipped with regulating disk on which the regulating screw and spring are set, anothe end of spring is connected with outer hub, and one end of drive shaft is equipped with spline which is matched with the above-mentioned spline and connected with it, the drive shaft is screw-connected with brake cover, the end of drive shaft is fixed on the outer hub, between the brake cover and inner hub a bearing is set, and one end of brake cover is connected with brake disk. |