Disc brake based on involute thrust arm

The utility model provides a disc brake based on an involute thrust arm, which belongs to the field of automobile disc brakes, comprises a caliper body, a thrust arm and a thrust seat, the thrust arm and the thrust seat are mounted in the caliper body, and is characterized in that an arc surface is processed at the front end of the thrust seat, a semicircular needle bearing is fixedly mounted on the arc surface, and the semicircular needle bearing is fixedly mounted on the semicircular needle bearing. The outer cambered surface of the thrust arm is in contact with the semicircular needle bearing; and the outer cambered surface of the thrust arm is an involute profile surface. A semicircular needle bearing is mounted between the thrust arm and the thrust seat, and is in contact with the involute profile surface of the thrust arm to reduce friction force; the outer cambered surface of the thrust arm is an involute profile surface, and the thrust arm can keep the arm of force unchanged in the rotating process, s