A mechanical disc brake structure comprising:
- a body, a brake set, and a drive unit;
- the body including two clamp seats between which an accommodation space is defined so as to accommodate a circular disc, the brake set being accommodated in the two clamp seats of the body, and the brake set being driven by the drive unit to clamp the circular disc;
- the brake set comprising:
- a rotation member including a coupling column rotatably connected on the body, a rotatable block formed on a first end of the coupling column, a connection portion extending from a second end of the coupling column and connected with the drive unit so that the drive unit drives the rotation member to rotate, the rotatable block having a push face formed on a side of the rotatable block adjacent to the accommodation space, the rotation member including a through aperture defined in the rotation member and having a stop fringe formed on an end of the through aperture proximate to the push face, and the stop fringe having a first retaining portion;
- an engagement member being fixed between the rotation member and the accommodation space and moving linearly but not rotating, the engagement member including a braking disc, and the braking disc having a forced face formed on a side of the braking disc adjacent to the rotation member, and the braking disc having a shaft extending from a middle of the forced face and accommodated in the through aperture of the rotation member, the shaft having a second retaining portion arranged on an end of the shaft away from the braking disc, and the shaft having a threaded orifice formed on the end of the shaft adjacent to the second retaining portion;
- an actuation structure defined between the push face of the rotation member and the forced face of the engagement member so as to be actuated by the rotation member to move linearly;
- a torsion spring accommodated in the through aperture of the rotation member, two ends of the torsion spring being engaged with the first retaining portion of the rotation member and the second retaining portion of the engagement member, and a screw element being screwed with the threaded orifice of the shaft of the engagement member, the rotation member and the engagement member being connected by ways of the torsion spring, the forced face of the engagement member contacting with the push face of the rotation member, and the rotation member rotating and the engagement member moving back to an original position by using the torsion spring;
- and
- a locking member locked with the rotation member so that the rotation member does not remove from the two clamp seats of the body.