Valve train assembly

Abstract

A type II valve train assembly that selectively opens first and second intake valves and first and second exhaust valves is provided. The valve train assembly includes an intake rocker arm assembly and an exhaust rocker arm assembly. The valve train assembly is configurable for operation in any combination of activated and deactivated states of engine braking and cylinder deactivation. The exhaust rocker arm assembly includes a first exhaust rocker arm, a second exhaust rocker arm and an engine brake exhaust rocker arm. A first exhaust HLA is associated with the first exhaust rocker arm. A second exhaust HLA is associated with the second exhaust valve. An exhaust actuation assembly selectively actuates to alter travel of the first and second exhaust HLA's to change a state of cylinder deactivation between activated and deactivated.

1 . A type II valve train assembly that selectively opens first and second intake valves and first and second exhaust valves, the valve train assembly comprising:
 an intake rocker arm assembly, comprising:
 a first intake rocker arm configured to selectively open the first intake valve, a second intake rocker arm configured to selectively open the second intake valve, and an engine brake intake rocker arm configured to selectively and collectively open both of the first and second intake valves; 
 a first intake hydraulic lash adjuster (HLA) associated with the first intake valve and a second intake HLA associated with the second intake valve; 
 an intake actuation assembly configured to selectively actuate to alter travel of the first and second intake HLA's to change a state of cylinder deactivation between activated and deactivated; and 
   an exhaust rocker arm assembly, comprising:
 a first exhaust rocker arm configured to selectively open the first exhaust valve, a second exhaust rocker arm configured to selectively open the second exhaust valve, and an engine brake exhaust rocker arm configured to selectively and collectively open both of the first and second exhaust valves; 
 a first exhaust HLA associated with the first exhaust valve and a second exhaust HLA associated with the second exhaust valve; and 
 an exhaust actuation assembly configured to selectively actuate to alter travel of the first and second exhaust HLA's to change a state of cylinder deactivation between activated and deactivated, and 
   wherein the valve train assembly is configurable for operation in any combination of activated and deactivated states of engine braking and cylinder deactivation.   
     
     
         2 . The valve train assembly of  claim 1 , further comprising:
 a third intake HLA configured to selectively cooperate with the engine brake intake rocker arm.   
     
     
         3 . The valve train assembly of  claim 2 , wherein the intake actuation assembly is configured to selectively actuate to alter travel of the third intake HLA to change a state of Miller cycle between activated and deactivated. 
     
     
         4 . The valve train assembly of  claim 3 , further comprising:
 an engine brake capsule assembly configured to cooperate with the engine brake exhaust rocker arm.   
     
     
         5 . The valve train assembly of  claim 4 , wherein the engine brake capsule is configured to move between expanded and collapsed positions dependent upon an activated and deactivated state of engine braking. 
     
     
         6 . The valve train assembly of  claim 5 , wherein the engine brake capsule is configured to influence the engine brake exhaust rocker arm to open the first and second exhaust valves in the expanded position. 
     
     
         7 . The valve train assembly of  claim 1 , wherein the exhaust actuation assembly further comprises:
 a first latch pin configured to selectively engage the first exhaust HLA;   a first cam configured to rotate to influence movement of the first latch pin between extended and retracted positions;   a second latch pin configured to selectively engage the second exhaust HLA; and   a second cam configured to rotate to influence movement of the second latch pin between extended and retracted positions.   
     
     
         8 . The valve train assembly of  claim 1 , further comprising:
 a lever and lost motion spring assembly associated with the first exhaust HLA,   wherein the lost motion spring assembly is configured to compress upon rotation of the lever subsequent to movement of the first latch pin to the retracted position.   
     
     
         9 . The valve train assembly of  claim 1 , further comprising:
 a lost motion device associated with the exhaust engine brake rocker arm, the lost motion device including a piston and a biasing member configured to bias a roller associated with the exhaust brake rocker arm toward an engine brake cam.   
     
     
         10 . The valve train assembly of  claim 1 , further comprising:
 a mechanical lash adjustment element configured to cooperate with the engine brake exhaust rocker arm, the mechanical lash adjustment element comprising a threaded bolt and nut configured to allow for mechanical lash adjustment that acts on both of the first and second exhaust rocker arms to adjust lash.   
     
     
         11 . The valve train assembly of  claim 1 , wherein the intake actuation assembly is electromechanically actuated. 
     
     
         12 . The valve train assembly of  claim 1 , wherein the exhaust actuation assembly is electromechanically actuated. 
     
     
         13 . The valve train assembly of  claim 1 , wherein the first and second exhaust rocker arms comprise stamped metal. 
     
     
         14 . The valve train assembly of  claim 13 , wherein the engine brake exhaust rocker arm defines a pair of apertures that receive a pin,
 wherein the pin is configured to engage both of the first and second exhaust rocker arms and impart motion on the first and second rocker arms based on actuation of the engine brake exhaust rocker arm to open the first and second exhaust valves.   
     
     
         15 . The valve train assembly of  claim 1 , wherein at least one of the intake and exhaust actuation assemblies comprises an electronic latch. 
     
     
         16 . A type II valve train assembly that selectively opens first and second exhaust valves, the valve train assembly comprising:
 an exhaust rocker arm assembly, comprising:
 a first exhaust rocker arm configured to selectively open the first exhaust valve, a second exhaust rocker arm configured to selectively open the second exhaust valve, and an engine brake exhaust rocker arm configured to selectively and collectively open both of the first and second exhaust valves; 
 a first exhaust HLA associated with the first exhaust valve, and a second exhaust HLA associated with the second exhaust valve; and 
 an exhaust actuation assembly configured to selectively actuate to alter travel of the first and second exhaust HLA's to change a state of cylinder deactivation between activated and deactivated, 
   wherein the valve train assembly is configurable for operation in any combination of activated and deactivated states of engine braking and cylinder deactivation.   
     
     
         17 . The valve train assembly of  claim 16 , further comprising:
 an engine brake capsule assembly configured to cooperate with the engine brake exhaust rocker arm,   wherein the engine brake capsule is configured to move between expanded and collapsed positions dependent upon an activated and deactivated state of engine braking.   
     
     
         18 . The valve train assembly of  claim 17 , wherein the engine brake capsule is configured to influence the engine brake exhaust rocker arm to open the first and second exhaust valves in the expanded position. 
     
     
         19 . The valve train assembly of  claim 16 , wherein the exhaust actuation assembly further comprises:
 a first latch pin configured to selectively engage the first HLA;   a first cam configured to rotate to influence movement of the first latch pin between extended and retracted positions;   a second latch pin configured to selectively engage the second HLA; and   a second cam configured to rotate to influence movement of the second latch pin between extended and retracted positions.   
     
     
         20 . The valve train assembly of  claim 16 , further comprising:
 a lever and lost motion spring assembly associated with the first exhaust HLA,   wherein the lost motion spring assembly is configured to compress upon rotation of the lever subsequent to movement of the first latch pin to the retracted position.   
     
     
         21 . A type II valve train assembly that selectively opens first and second intake valves and first and second exhaust valves, the valve train assembly comprising:
 an intake rocker arm assembly, comprising:
 an intake rocker arm configured to selectively open the first and second intake valves; 
 an intake hydraulic lash adjuster (HLA) associated with the first intake rocker arm; and 
 an intake actuation assembly configured to selectively actuate to alter travel of the intake HLA to change a state of cylinder deactivation between activated and deactivated; and 
   an exhaust rocker arm assembly, comprising:
 a first exhaust rocker arm configured to selectively open the first and second exhaust valves; 
 a second exhaust rocker arm configured to selectively open at least one of the first and second exhaust valves during engine braking; 
 an exhaust HLA associated with the first exhaust rocker arm; 
 an exhaust actuation assembly configured to selectively actuate to alter travel of the exhaust HLA to change a state of cylinder deactivation between activated and deactivated, 
   wherein the valve train assembly is configurable for operation in any combination of activated and deactivated states of engine braking and cylinder deactivation.   
     
     
         22 . The valve train assembly of  claim 21 , further comprising:
 a first valve bridge extending between the first and second intake valves and that is configured to influence opening of the first and second intake valves based on movement of the intake rocker arm.   
     
     
         23 . The valve train assembly of  claim 22 , further comprising:
 a second valve bridge extending between the first and second exhaust valves and is configured to influence opening of the first and second exhaust valves based on movement of the first exhaust rocker arm.   
     
     
         24 . The valve train assembly of  claim 23  wherein the exhaust actuation assembly further comprises:
 a latch pin configured to selectively engage the intake HLA; 
 a lost motion spring assembly; and 
 a lever extending between the latch pin and the lost motion spring assembly, 
 wherein the lost motion spring assembly is configured to compress upon rotation of the lever subsequent to movement of the latch pin to the retracted position.