Patent ID: 7013880
Filing Date: 2006-03-21
Classification: F02M

Abstract:
1. An EGR valve comprising: a valve housing having one or more exhaust-gas inlet ports and two or more exhaust-gas outlet ports, which is connectable to the exhaust-gas recirculation passage of an engine, and forming an exhaust-gas passage communicated with these exhaust-gas inlet ports and exhaust-gas outlet ports; first and second valve-sheets disposed on the inner peripheral face of the valve housing; a valve shaft axially movably assembled into the valve housing; and first and second valves secured on the valve shaft, and almost simultaneously abut on the first and second valve-sheets, respectively to close the exhaust-gas recirculation passage when the valve shaft moves in one direction, wherein the valve housing is formed of material having an axial thermal expansion coefficient larger than that of the valve shaft, located at least between the first valve-sheet and the second valve-sheet, and the distance between the first valve-sheet and the second valve-sheet is set so as to be equal with that between the first valve and the second valve at the normal temperature.