Patent ID: 7503316
Filing Date: 2009-03-17
Classification: F02M,Y10T

Abstract:
1. An exhaust gas recirculation valve assembly for use in an internal combustion engine, comprising: a) a valve body having a first chamber therein for communication with an exhaust gas flow in said engine, and having a second chamber therein for communication with an intake air flow in said engine, and having a valve seat in a port between said first and second chambers; b) a pintle shaft extending into said valve body coaxial with said port for supporting a valve head matable with said valve seat for variably opening said port to permit exhaust gas flow therethrough; c) an actuator mounted to said valve body and connected to said pintle shaft for axial actuation thereof; and d) an anti-coking bushing assembly disposed in a bore in said body for supporting said pintle shaft during said axial motion thereof, said anti-coking bushing assembly including a sleeve having a first end distal from, and a second end proximal to, an exhaust gas flow space in said valve body, a ring seal disposed within said sleeve adjacent said second sleeve end for sealing against said pintle shaft, and at least one bushing liner disposed within said sleeve for supporting said pintle shaft during axial motion thereof in use of said exhaust gas recirculation valve assembly.