Patent ID: 9255621
Filing Date: 2016-02-09
CPC Classification: F16F

Claim Text:
1. A damper, comprising a rotation shaft, used to connect to a body disposed in a fixed base or a pivot element, the body is provided with a cavity with a central axis; the rotation shaft is inserted into the cavity of the body in sealing way, an oil cavity is disposed between the cavity and the rotation shaft, wherein: an external wall of the rotation shaft is provided with at least one pair of protruding ribs extending axially, each protruding rib has a groove, one side of the groove is a first retaining wall, the other side of the groove is a second retaining wall; a transitional arc is disposed between a side wall of the groove and a top surface of the first retaining wall, a first shape is formed between another side wall of the groove and a top surface of the second retaining wall; two blades are further provided, each blade is disposed between the groove of one protruding rib and an internal wall of the cavity, and the blade is movable between the two retaining walls of the groove; the cross section of each blade is generally T shaped, and a curvature of an external side surface of the blade conforms to the internal wall of the cavity; a second shape is formed between a projection in the center of the internal side and a left arm to complement with the first shape and cut off a flow of oil, an intersection angle between the projection in the center of an internal side and a right arm is provided with a transitional arc; a first oil groove is disposed between an internal side and a right side of the projection, a second oil groove is disposed in the right arm correspondingly; and an internal side in the center of the left arm is provided with a third oil groove.