Valve train for an internal combustion engine

Abstract

The present disclosure describes a valve train for an internal combustion engine. The valve train includes a camshaft with a first cam and a second cam, a rocker lever assembly with a shifting pin that is adjustable in an axial direction between at least two positions, a cam follower mounted on the shifting pin, an adjusting device for adjusting a control pin arranged in the shifting pin, and a guide contour arranged on the camshaft having a first guide track and a second guide track intersecting the first guide track in an X-like manner. The control pin engages into the guide tracks and adjusts the shifting pin to adjust the cam follower. The adjusting device includes a control rod that is shiftable parallel to the shifting pin and contacts the control rod.

1 . A valve train for an internal combustion engine, comprising:
 a camshaft with a first cam and a second cam arranged adjacent thereto,   a rocker lever assembly with a shifting pin that is adjustable in an axial direction between at least two positions, on which a cam follower is mounted,   an adjusting device for adjusting a control pin arranged in the shifting pin,   a guide contour arranged on the camshaft having a first guide track and a second guide track intersecting the first guide track in an X-like manner,   the control pin engages into the first guide track or the second guide track and adjusts the shifting pin between the at least two positions, so that the cam follower in a first position of the shifting pin interacts with the first cam and in a second position of the shifting pin interacts with the second cam, and   the adjusting device including a control rod that is shiftable parallel to the shifting pin having a first control region, a second control region and a neutral region arranged in between in the axial direction, wherein the control pin upon contact with the first control region is adjusted into the first guide track and upon contact with the second control region is adjusted into the second guide track.   
     
     
         2 . The valve train according to  claim 1 , wherein the adjusting device further includes a housing structured and arranged to guide the control rod. 
     
     
         3 . The valve train according to  claim 1 , wherein at least one of the first control region and the second control region is structured as a cylindrical shifting disc. 
     
     
         4 . The valve train according to  claim 2 , wherein the housing is structured cylindrically and comprises a shell opening, via which the control pin is contactable with the first control region and the second control region. 
     
     
         5 . The valve train according to  claim 1 , further comprising a solenoid arranged on the control rod, wherein the control rod is adjustable into the first position or the second position by energising the solenoid. 
     
     
         6 . The valve train according to  claim 1 , further comprising two solenoids, wherein the control rod is adjustable into the first position or the second position through alternative energising of the two solenoids. 
     
     
         7 . The valve train according to  claim 1 , further comprising at least one spring, structured and arranged to preload the control rod into the first position or the second position. 
     
     
         8 . The valve train according to  claim 7 , wherein the first control region is arranged on a longitudinal end side of the control rod and has a pot-like shape, and wherein the at least one spring is structured as a coil spring and is at least partly arranged in the first control region. 
     
     
         9 . The valve train according to  claim 1 , further comprising a position sensor, structured and arranged to detect a position of the control rod. 
     
     
         10 . The valve train according to  claim 1 , wherein at least one of:
 at least one of the first control region and the second control region has a flattened region that provides a contact region for the control pin, and   the first control region and the second control region have at least one of different heights and different diameters from one another.   
     
     
         11 . An internal combustion engine comprising: a valve train, the valve train including:
 a camshaft with a first cam and a second cam arranged adjacent thereto;   a rocker lever assembly with a shifting pin that is adjustable in an axial direction between at least two positions, on which a cam follower is mounted;   an adjusting device for adjusting a control pin arranged in the shifting pin;   a guide contour arranged on the camshaft having a first guide track and a second guide track intersecting the first guide track in an X-like manner;   the control pin engages into the first guide track or the second guide track and adjusts the shifting pin between the at least two positions, so that the cam follower in a first position of the shifting pin interacts with the first cam and in a second position of the shifting pin interacts with the second cam; and   the adjusting device including a control rod that is shiftable parallel to the shifting pin a first control region, a second control region and a neutral region arranged in between in the axial direction, wherein the control pin upon contact with the first control region is adjusted into the first guide track and upon contact with the second control region is adjusted into the second guide track.   
     
     
         12 . The internal combustion engine according to  claim 11 , wherein the adjusting device further includes a housing structured and arranged to guide the control rod. 
     
     
         13 . The internal combustion engine according to  claim 12 , wherein the housing has a cylindrical shape with a shell opening, and wherein the control pin contacts the first control region and the second control region via the shell opening. 
     
     
         14 . The internal combustion engine according to  claim 11 , further comprising a solenoid structured and arranged to adjust the control rod into at least one of the first position and the second position. 
     
     
         15 . The internal combustion engine according to  claim 11 , further comprising at least one spring structured and arranged to preload the control rod into at least one of the first position and the second position. 
     
     
         16 . The internal combustion engine according to  claim 11 , wherein at least one of the first control region and the second control region has a flattened region that provides a contact region for the control pin. 
     
     
         17 . The internal combustion engine according to  claim 11 , wherein the first control region and the second control region have different heights from one another. 
     
     
         18 . The internal combustion engine according to  claim 11 , wherein the first control region and the second control region have different diameters from one another. 
     
     
         19 . The valve train according to  claim 5 , wherein the solenoid includes a coil surrounding the control rod. 
     
     
         20 . The valve train according to  claim 5 , wherein the solenoid includes a permanent magnet arranged on the control rod.