Patent ID: 8904766
Filing Date: 2014-12-09
Classification: F01N,F16L,Y02T

Abstract:
1. An exhaust gas treatment device comprising an upstream cylinder located at an exhaust gas passage in an engine mounted on a vehicle body, a downstream cylinder located on a downstream side of said upstream cylinder, and a purifying part cylinder mounted in an axis line direction in series and detachably connected between said upstream cylinder and said downstream cylinder, and accommodating a treatment member therein for purifying an exhaust gas, wherein said upstream cylinder is closed at one side in the axial direction which is an upstream side thereof and is provided with a flange portion having a flat connecting surface at the other side in the axial direction, said downstream cylinder is provided with a flange portion having a flat connecting surface at one side in the axial direction thereof and is closed at the other side in the axial direction, said purifying part cylinder is provided with a front side flange portion having a flat connecting surface to be connected to and opposed with said flange portion of said upstream cylinder at one side in the axial direction thereof and is provided with a rear side flange portion having a flat connecting surface to be connected to and opposed with said flange portion of said downstream cylinder at the other side in the axial direction, said flange portion of said upstream cylinder and said front side flange portion of said purifying part cylinder are connected by use of one of a clamping device or a plurality of bolts and nuts, and said flange portion of said downstream cylinder and said rear side flange portion of said purifying part cylinder are connected by use of the other of said one of said clamping device or said plurality of bolts and nuts used to connect said flange portion of said upstream cylinder and said front side flange portion of said purifying part cylinder, wherein said front side flange portion and said rear side flange portion of said purifying part cylinder are provided with positioning pins projecting, respectively, toward said upstream cylinder and said downstream cylinder from said connecting surfaces to align each of said cylinders to be coaxial in said axis line direction, said flange portion of said upstream cylinder and said flange portion of said downstream cylinder are provided with notched grooves for positioning said purifying part cylinder relative to said upstream cylinder and said downstream cylinder by engaging with said positioning pins, and each of said notched grooves is formed as a notch in said flange portions extending from an outer peripheral edge portion toward a center thereof.