Patent ID: 6062535
Filing Date: 2000-05-16
Classification: F02M,F16K

Abstract:
An exhaust gas recirculation (EGR) valve for an internal combustion engine for controlling the flow of exhaust gas into a cylinder combustion chamber comprising:a valve housing having a cavity, an inlet passage and an outlet passage;a poppet valve positioned in said cavity and including a reciprocally mounted valve element and a valve seat, said valve element including a valve stem and a valve head integrally formed on said valve stem, said poppet valve being movable between an open position in which said valve element is positioned a spaced distance from said valve seat to permit exhaust gas flow through said cavity and a closed position in which said valve element engages said valve seat to block exhaust gas flow through said cavity;a bias means for providing a positive force on said valve stem to create a seal between said valve head and said valve seat; andan exhaust gas flow varying means positioned in said cavity adjacent said valve element for controlling the exhaust gas flow rate from said inlet passage to said outlet passage during movement of said poppet valve, said exhaust gas flow varying means including an insert and a flow passage formed in said insert, said insert including an inlet opening for receiving exhaust gas from said inlet passage and directing the exhaust gas flow into said flow passage, and an outlet opening for directing the exhaust gas flow from said flow passage to said outlet passage;wherein movement of said valve element from said closed to said open position varies the effective cross-sectional flow area of said flow passage, said insert including a tapered inner extent such that said inlet opening has a different diameter than said outlet opening, and said insert is separably replaceable from said valve seat which is engaged by the valve element in said closed position.