Adjustment device for the longitudinal adjustment of a vehicle seat

Abstract

It is provided an adjusting device for the longitudinal adjustment of a vehicle seat, comprising at least one rail for defining a longitudinal seat axis along which a seat base of the vehicle seat is adjustable, and for supporting at least one adjusting unit of the adjusting device, and at least two shiftably guided adjusting units arranged one behind the other along the longitudinal seat axis, to which the seat base is to be fixed in order to be adjustable along the longitudinal seat axis. The at least two adjusting units are adjustable relative to each other along the longitudinal seat axis, and each adjusting unit is assigned a separate drive for the power-operated adjustment along the longitudinal seat axis.

1 . An adjusting device for the longitudinal adjustment of a vehicle seat, the adjusting device comprising:
 at least one rail for defining a longitudinal seat axis along which a seat base of the vehicle seat is adjustable, and for supporting at least one adjusting unit of the adjusting device, the at least one rail being open on a long side and   at least one adjusting unit which is shiftably guided along the longitudinal seat axis and to which the seat base is fixed in order to be adjustable along the longitudinal seat axis,   wherein the at least one adjusting unit is assigned a separate drive for a power-operated adjustment along the longitudinal seat axis and wherein the at least one adjusting unit is shiftably mounted on the at least one rail via at least one roller, wherein the at least one roller is rotatably mounted, and   wherein the at least one roller is supported on a convexly curved guide profile that is integrally formed with the at least one rail or is a separate component connected to the at least one rail so that the roller is configured to roll off on the at least one rail or off the separate component for shifting the at least one adjusting unit along the longitudinal seat axis.   
     
     
         2 . The adjusting device according to  claim 1 , wherein the at least one adjusting unit includes a bearing part for connection to a rocker of the seat base. 
     
     
         3 . The adjusting device according to  claim 1 , wherein a spindle and a spindle nut meshing therewith are provided for the power-operated adjustment of the at least one adjusting unit. 
     
     
         4 . The adjusting device according to  claim 3 , wherein a longitudinal axis of the spindle extends substantially perpendicularly to a drive axis of the drive of an adjusting unit. 
     
     
         5 . The adjusting device according to  claim 3 , wherein the spindle is supported on the at least one supporting element. 
     
     
         6 . The adjusting device according to  claim 5 , wherein at least two supporting elements are provided on at least one of the adjusting units, the spindle extending through the at least two supporting elements. 
     
     
         7 . The adjusting device according to  claim 6 , wherein at least two pairs of supporting elements each arranged one behind the other along the longitudinal seat axis are provided on an adjusting unit and the spindle extends through the at least two pairs of supporting elements. 
     
     
         8 . The adjusting device according to  claim 7 , wherein the spindle nut meshing with the spindle is rotatably mounted between the at least two pairs of supporting elements of an adjusting unit. 
     
     
         9 . The adjusting device according to  claim 8 , wherein the spindle nut is part of an adjusting gear unit at least partly accommodated in a gear unit housing and coupled to the drive of the adjusting unit. 
     
     
         10 . The adjusting device according to  claim 9 , wherein the gear unit housing is at least partly formed by two bearing plates facing each other transversely to the longitudinal seat axis and on which at least one rotatable supporting element is mounted, or wherein the gear unit housing is fixed to the bearing plates facing each other. 
     
     
         11 . The adjusting device according to  claim 1 , wherein the open long side of the at least one rail is provided on an inside of the at least one rail which faces, in a mounted state, an inside of another adjusting device of a rail assembly for the vehicle seat. 
     
     
         12 . The adjusting device according to  claim 1 , wherein the adjusting device comprises at least two adjusting units which are arranged one behind the other along the longitudinal seat axis and are adjustable relative to each other along the longitudinal seat axis, wherein each one of the at least two adjusting units is assigned a separate drive for the power-operated adjustment along the longitudinal seat axis. 
     
     
         13 . The adjusting device according to  claim 12 , wherein a common, stationary spindle and two spindle nuts each assigned to one of the least two adjusting units and each meshing with the spindle are provided for the power-operated adjustment of the at least two adjusting units. 
     
     
         14 . The adjusting device according to  claim 12 , wherein the adjusting device includes an electronic control unit for controlling the adjusting movements of the at least two adjusting units relative to each other. 
     
     
         15 . The adjusting device according to  claim 14 , wherein the electronic control unit is equipped to vary a distance of the at least two adjusting units relative to each other along the longitudinal seat axis for a variation of at least one of an inclination and a height of the seat base and a cushion support arranged on the seat base. 
     
     
         16 . The vehicle seat according to  claim 12 , wherein the at least two adjusting units are shiftably mounted on a single rail or on different rails.