Four-joint coupling gear and exhaust turbo charger

The linkage (1) has a coupler (4) for operatively connecting a drive vibrator (2) and an output vibrator. The drive vibrator comprises a guide element (11) that is operatively connected with the drive, and a connecting element (12) that is associated to the coupler. The guide and connecting elements are mounted in a connecting bearing point (13) and fixed in fixed position by a fixing device (14). The fixing device comprises a locking element (15) that cooperates with a counter locking element (18), where the locking element is arranged at the connecting element.