Meshing Mechanical Speed ​​Limiting Mechanism

The invention provides an engaging type mechanical speed limiting mechanism. The engaging type mechanical speed limiting mechanism comprises a box, a speed limiting inner gear ring and an eccentric gear, wherein the speed limiting inner gear ring and the eccentric gear are installed in the box. The speed limiting inner gear ring is installed on a spindle in a clearance fit mode, the spindle is sleeved with a cylindrical torsional spring for fixedly connecting the box and the inner gear ring, and flat keys are symmetrically machined on the segment, connected with the eccentric gear, of the spindle for installation of the eccentric gear. A centrifugal rail is machined in the eccentric gear, and key slots matched with the flat keys of the spindle are formed in the centrifugal rail. The interior of a centrifugal spring penetrates through the lower flat key of the spindle to be kept in contact with the lower half portion of the outer surface of the spindle, a metal blocking piece abuts against the eccentric gear, and the end face of the metal blocking piece is welded to the spindle. When the rotating speed of the spindle is too high, the eccentric gear is in an eccentric state to be engaged and clamped with the inner gear ring to drive the inner gear ring to rotate together so as to reduce the speed. The engaging type mechanical speed limiting mechanism is suitable for occasions where the rotating speed is limited but not required to be fixed in engineering drive, the speed reduction process is rapid and reliable, the structure is simple, and use is convenient.