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A damping mechanism has a housing body defining a cavity with a central axis, a threaded section disposed with female threads revolving about the central axis and a smooth section; a rotating shaft inserted into the cavity; and a piston, wherein the piston comprises a threaded section disposed with

A damping mechanism has a housing body defining a cavity with a central axis, a threaded section disposed with female threads revolving about the central axis and a smooth section; a rotating shaft inserted into the cavity; and a piston, wherein the piston comprises a threaded section disposed with male threads revolving about the central axis and a piston head. 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 head is clearance-fitted or seal-fitted with the smooth section of the cavity. An axial hole section of the piston is clearance-fitted or seal-fitted with the rotating shaft. The rotating shaft is provided with a radially outwardly-opening and axially-extending oiling slot on the sliding path of the piston head while the depth and/or width of the oiling slot changes gradually.

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1. A damping mechanism, 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 revo

1. A damping mechanism, 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, and a smooth section;a rotating shaft, one end of the rotating shaft being inserted into the cavity, the other end of the rotating shaft being connected to the other one of the pivotal element and stationary element, the rotating shaft being provided with a radially outwardly-opening and axially-extending oiling slot, the depth and/or width of the oiling slot changing gradually; andpiston having a threaded section disposed with male threads revolving about the central axis, and a piston head, 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 being slidable on the rotating shaft along the central axis, the piston head being radially clearance-fitted or seal-fitted with the smooth section of the cavity, an axial hole section of the piston being clearance-fitted or seal-fitted with the rotating shaft, thereby dividing the cavity along a central axial direction into a first sub cavity containing the threaded section of the cavity and a second sub cavity axially opposite to the first sub cavity;wherein 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 radial clearance between the axial hole section of the piston and the rotating shaft, and/or through the radial clearance between the piston head and the smooth section of the cavity, to provide a damping effect on the relative rotation between the rotating shaft and the bodyand wherein the radially outwardly-opening and axially-extending oiling slot is on the sliding path of the piston head. 2. The damping mechanism according to claim 1, wherein the body has a first axial end and a second axial end axially opposite to the first axial end along the central axial direction; the cavity has a first axial opening outwardly-extending the body along the central axial direction at the first axial end; the second axial end has an end cover covering the cavity axially; and the rotating shaft has a middle shaft segment inserted into the cavity along the central axial direction from the first axial opening and a shaft stretching segment inserted into the cavity again along the central axial direction from the middle shaft segment; the shaft stretching segment has a free end portion; at least one axial relative limit is arranged between the body and at least one of the middle shaft segment and the free end portion; andthe piston is slidable along the shaft stretching segment of the rotating shaft; the axial hole section is formed at the piston head and radially clearance-fitted with the shaft stretching segment. 3. The damping mechanism according to claim 1, wherein the shaft stretching segment is provided with the oiling slot; the axial length of the oiling slot is greater than that of the axial hole section, thus when the axial hole section slides onto the oiling slot along the shaft stretching segment, the first and second sub cavity communicate with each other by liquid through the oiling slot. 4. The damping mechanism according to claim 2, wherein the piston head is disposed with a check valve path, then when the piston head is sliding toward the oiling slot axially, the second sub cavity and the first sub cavity communicate with each other by liquid through the check valve path, and when the piston head is sliding away from the oiling slot axially, the check valve is closed. 5. The damping mechanism according to claim 4, wherein the check valve path comprises: an annular slot on the piston head, the annular slot radial outwardly-opening and opening for the second sub cavity;a pressure-relieving hole path toward the first sub cavity from the annular slot; anda check valve ring sleeved on the annular slot, wherein the check valve ring can shift axially in the annular slot and slide axially in a seal manner supporting against the smooth section of the cavity,wherein when the piston head slides axially toward the oiling slot, the check valve ring shifts toward the direction opposite to the piston head, then the second sub cavity and first sub cavity can communicate with each other by liquid through the axial clearance opened by the relative shift between the check valve ring and the annular slot, and through the pressure-relieving hole path; and when the piston head slides away from the oiling slot, the check valve ring shifts toward the oiling slot relative to the piston head in the annular slot, the axial clearance is closed and the liquid path of the first and second sub cavities through the pressure-relieving hole path is closed by the check valve ring as well. 6. The damping mechanism according to claim 5, wherein the pressure-relieving hole path radially inwardly passes through the piston head from the radial base of the annular slot for communicating with the first sub cavity. 7. A damping mechanism, 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, the rotating shaft being provided with a radially outwardly-opening and axially-extending oiling slot, the depth or width of the oiling slot changing gradually; anda piston having a threaded section disposed with male threads revolving about the central axis, 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 being slidable on the rotating shaft along the central axis, an axial hole section of the piston being 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;wherein 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, to provide a damping effect on the relative rotation between the rotating shaft and the body; andwherein the radially outwardly-opening and axially-extending oiling slot is on the sliding path of the piston head. 8. A damping mechanism, 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; androtating shaft, one end of the rotating shaft being inserted into the cavity, the other end of the rotating shaft being connected with the other one of the pivotal element and stationary element, the rotating shaft being provided with a radially outwardly-opening and axially-extending oiling slot, a depth or width of the oiling slot changing gradually;wherein the cavity is divided along a central axial direction into a first sub cavity and a second sub cavity, 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; andwherein the radially outwardly-opening and axially-extending oiling slot being on the path between the first sub cavity and the second sub cavity. 9. The damping mechanism according to claim 8, wherein the cavity has a central axis and comprises a threaded section disposed with female threads revolving about the central axis and a smooth section; further comprising a piston having a threaded section disposed with male threads revolving about the central axis and a piston head; 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 being slidable on the rotating shaft along the central axis, the piston head being radially clearance-fitted or seal-fitted with the smooth section of the cavity; an axial hole section of the piston being radially clearance-fitted or seal-fitted with the rotating shaft, thereby dividing the cavity along the central axial direction into a first sub cavity containing the threaded section of the cavity and a second sub cavity axially opposite to the first sub cavity;wherein 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 radial clearance between the axial hole section of the piston and the rotating shaft, and/or through the radial clearance between the piston head the smooth section of the cavity, to provide a damping effect on the relative rotation between the rotating shaft and the body; andwherein the radially outwardly-opening and axially-extending oiling slot is on the sliding path of the piston head. 10. The damping mechanism according to claim 9, wherein the piston head is disposed with a check valve path, so that when the piston head slides toward the oiling slot axially, the second sub cavity and the first sub cavity communicate with each other by liquid through the check valve path, and when the piston head slides away from the oiling slot axially, the check valve is closed. 11. The damping mechanism according to claim 10, wherein the check valve path comprises: an annular slot on the piston head;a pressure-relieving hole path; anda check valve ring sleeved on the annular slot, wherein the check valve ring can shift axially in the annular slot and slide axially to seal against a smooth section of the cavity,wherein when the piston head slides axially toward the oiling slot, the check valve ring shifts toward the direction opposite to the piston head, so that the second sub cavity and first sub cavity communicate with each other by liquid through the axial clearance opened by the relative shift between the check valve ring and the annular slot, and through the pressure-relieving hole path; and when the piston head slides away from the oiling slot, the check valve ring shifts toward the oiling slot relative to the piston head in the annular slot, and the axial clearance is closed and the liquid path of the first and second sub cavities through the pressure-relieving hole path is closed by the check valve ring as well. 12. The damping mechanism according to claim 11, wherein the pressure-relieving hole path radially inwardly passes through the piston head from the radial base of the annular slot for communicating with the first sub cavity. 13. The damping mechanism according to claim 11, wherein the check valve ring is a V-shaped seal ring, the V shape opening toward the shaft stretching segment of the rotating shaft.