Damping structure

A damping mechanism, used for pivotally connecting a pivotal element and a stationary element, comprising:

• a body connected to one of the pivotal element and the stationary element, the body defining a cavity having a central axis, the cavity comprising a threaded section disposed with female threads revolving about the central axis;
• a rotating shaft inserted into the cavity, for being connected to the other one of the pivotal element and stationary element;
• and
• a piston, wherein the piston comprises a threaded section disposed with male threads revolving about the central axis. The threaded section of the cavity and the threaded section of the piston constitute a screw-on fit relationship between the female and male threads. The piston can slide on the rotating shaft along the central axis. An axial hole section of the piston is radially clearance-fitted or seal-fitted with the rotating shaft, thereby dividing the cavity along the central axial direction into a first sub cavity and a second sub cavity axially opposite to the first sub cavity. When the piston revolves along with the rotating shaft and shifts axially, the fluid filled in the first and second sub cavities is forced to flow from one sub cavity to another through the clearance between the piston and the rotating shaft, and/or through the clearance between the female and male threads, thus, it can provide a damping effect on the relative rotation between the rotating shaft and the body;

A damping mechanism, used for pivotally connecting a pivotal element and a stationary element, comprising:

• A body connected with one of the pivotal element and the stationary element, the body defining a cavity;
• A rotating shaft, one end inserted into the cavity, the other end connected with the other one of the pivotal element and stationary element;
• The cavity dividing along the central axial direction into a first sub cavity and a second sub cavity, then the fluid filled in the first and second sub cavities being forced to flow from one sub cavity to another along with the rotation of the rotating shaft, thus providing a damping effect on the relative rotation between the rotating shaft and the body;
• The rotating shaft is provided with a radially outwardly-opening and axially-extending oiling slot on the path between the first sub cavity and the second sub cavity while the depth or width of the oiling slot changes gradually.