Patent ID: 9010089
Filing Date: 2015-04-21
Classification: F01N,Y02A,Y02T

Abstract:
1. A reductant delivery unit for selective catalytic reduction (SCR) after-treatment for vehicles in combination with an exhaust boss, the combination comprising: a reductant delivery unit comprising: an exhaust boss separate from the flange and having a surface defining a through-hole constructed and arranged to communicate with a vehicle's exhaust flow path, the flange being coupled to a planar mounting surface of the exhaust boss such that the outlet of the fluid injector communicates with the exhaust flow path so as to control injection of urea solution into the exhaust gas flow path, a gasket sandwiched between the flange and the planar mounting surface of the exhaust boss, the gasket having a surface defining a through-hole therein that communicates with the through-hole in the exhaust boss to permit the urea solution to pass from the outlet to the exhaust flow path, with the outlet of the fluid injector being upstream of the through-holes, and gasket shielding structure separate from the flange and engaged with and covering the surface defining the through-hole in the gasket so that the urea solution may contact the gasket shielding structure, with the gasket shielding structure preventing the urea solution from contacting the gasket.