Patent attributes
A torsional vibration dampener for dampening torsional vibrations of a rotationally driven shaft. A hub is axially connected to the shaft, and a rotationally symmetrical body of inertia that acts as a vibrational mass is connected to the hub by a rubber elastic ring. The body of inertia comprises a primary part and a secondary part that is coaxial therewith and pivotable thereto. Displacement chambers are formed by and disposed between the primary and secondary parts. At least two displacement chambers communicate with one another via at least one flow control mechanism. Relative movement between the primary and secondary parts alters the volumes of the displacement chambers such that the volume of one decreases by the amount by which the other increases. The displacement chambers are filled with hydraulic fluid to form a fluid coupling between the primary and secondary parts such that upon relative movement between them, due to the resulting change in volume of the displacement chambers hydraulic fluid flows from one displacement chamber into the other via the flow control mechanism.
