Adjustment drive

Abstract

There is described an adjustment drive for a motor vehicle, in particular for a camshaft adjuster of an internal combustion engine, wherein the adjustment drive is constructed as a three-shaft transmission, having a transmission input shaft (NAR), an adjustment shaft (VW) which drives an eccentric tappet (EL, ZEL) which supports an externally toothed transmission element (GE), a gearwheel, and a transmission output shaft (GP) which is coupled to an internal gear (HR) which interacts with the externally toothed transmission element (GE) driven by the eccentric tappet (EL, ZEL) of the adjustment shaft (VW), the gearwheel, with a torque support between transmission input shaft and the externally toothed transmission element which has elastic coupling elements (FE).

1 . An adjustment drive for a motor vehicle, in particular for a camshaft adjuster of an internal combustion engine, wherein the adjustment drive is constructed as a three-shaft transmission having a transmission input shaft, an adjustment shaft which drives an eccentric tappet which supports an externally toothed transmission element, a gearwheel, and a transmission output shaft which is coupled to an internal gear which interacts with the externally toothed transmission element driven by the eccentric tappet of the adjustment shaft, the gearwheel, having a torque support between the transmission input shaft and the externally toothed transmission element which has elastic coupling elements. 
     
     
         2 . The adjustment drive as claimed in  claim 1 , wherein the torque support has a central middle part and substantially tangentially running arms between the middle part and the transmission input shaft or between the middle part and the externally toothed transmission element. 
     
     
         3 . The adjustment drive as claimed in  claim 2 , wherein the arms have in each case a bending joint in the region of the linkage at the middle part. 
     
     
         4 . The adjustment drive as claimed in  claim 2 , wherein the central middle part is connected via in each case a pair of arms to the transmission input shaft and the externally toothed transmission element. 
     
     
         5 . The adjustment drive as claimed in  claim 2 , wherein the arms between the middle part and the transmission input shaft or between the middle part and the externally toothed transmission element comprises in each case two webs running parallel to one another. 
     
     
         6 . The adjustment drive as claimed in  claim 1 , wherein the torque support comprises a plate, preferably of spring steel which has the elements which serve the purpose of elastic coupling cut outs. 
     
     
         7 . The adjustment drive as claimed in  claim 1 , wherein the adjustment drive is formed as a camshaft adjuster of an internal combustion engine, wherein the transmission input shaft is a camshaft drive wheel driven by the crankshaft of the internal combustion engine, the adjustment shaft is driven by an electric drive, and the internal gear is coupled to the camshaft.