Tilt adjustment mechanism and mounting bracket

A tilt adjustment mechanism, comprising:

• a first structural member, wherein a first sidewall of the first structural member defines a first connection hole and a second connection hole;
• and
• a second structural member, wherein a second sidewall of the second structural member defines a first pivot hole and an adjustment hole;
• wherein the adjustment hole comprises at least two adjustment sub-holes arranged along a front-rear direction of the tilt adjustment mechanism, a distance between centers of any two adjacent adjustment sub-holes is smaller than a diameter of a single adjustment sub-hole, with each adjustment sub-hole corresponding to a distinct tilt angle;
• wherein the tilt adjustment mechanism further comprises a connecting member and an adjustment rod;
• the connecting member is connected between the first connection hole and the first pivot hole, and the adjustment rod is penetrated between the adjustment hole and the second connection hole;
• wherein the adjustment rod comprises a flattened portion, the flattened portion comprises a cylindrical surface and two planes located on opposite sides of the cylindrical surface respectively;
• a diameter of the cylindrical surface is equal to a diameter of each of the adjustment sub-holes, and a distance between the two planes is less than or equal to a width of a connecting portion between two adjacent adjustment sub-holes;
• wherein when the adjustment rod is rotated to a first position, the adjustment rod is capable of passing through the connecting portion between two adjacent adjustment sub-holes;
• and
• wherein when the adjustment rod is rotated to a second position, the adjustment rod is locked relative to the adjustment hole.