Continuously variable transmission mechanism

A continuously variable transmission comprising:

• a worm gear body that is formed such that a spiral pitch of a screw gear having a spiral shape and formed on a peripheral surface of a gear shaft body is gradually changed;
• a wheel gear body on an output side that is formed such that a meshing position where the wheel gear body meshes with the worm gear body is adjustable so as to allow the wheel gear body to mesh with the worm gear body at an arbitrary position;
• and
• an adjustment operation unit that is connected with the wheel gear body, the worm gear body, or both of the wheel gear body and the worm gear body in an interlocking manner so as to adjust the meshing position where the worm gear body and the wheel gear body mesh with each other, wherein
• a gear rotational speed from an input side is changeable to a gear rotational speed on the output side in a continuously variable manner by an operation of the adjustment operation unit, and
• the wheel gear body has gear teeth formed at a fixed pitch in a circumferential direction.