Patent ID: 6591798
Filing Date: 2003-07-15
Classification: F01L,Y10T

Abstract:
A variable valve actuation (VVA) assembly for actuation and deactuation of valves in an internal combustion engine having a camshaft with high-lift and low-lift lobes for at least one of said valves, each of said lobes having a lift portion and a base circle portion, the camshaft having an axis of rotation, comprising:a) a rocker assembly pivotably disposed on pivot means in said engine for variably responding to rotary motion of said lobes to open and close a valve of said engine, said rocker assembly including a frame fixedly supportive of at least one low-lift cam follower and pivotably supportive of a variably pivotable high-lift cam follower, said follower being pivotable about a first pivot axis; b) a primary latching assembly and a secondary latching assembly, said primary latching assembly disposed on said rocker assembly for variably latching said high-lift cam follower to said frame, said primary latching assembly including a primary latching pin slidingly disposed in a bore in said frame and variably engageable with said high-lift cam follower, said primary latching pin having a trigger portion for engaging with said secondary latching assembly, a first spring operatively connected to said primary latching pin for urging said pin out of engagement with said high-lift follower, said secondary latching assembly adjacent said primary latching assembly for variably actuating said primary latching assembly; and c) a solenoid adjacent said secondary latching assembly for variably actuating said secondary latching assembly.