Abstract:
A method for manufacturing a member for purifying exhaust gas for an automobile exhaust line, including an enclosure, an exhaust gas purification unit arranged in the enclosure, and at least one element for supporting the unit. The method includes the following steps: obtaining a first quantity representative of a mass (Mb) of the exhaust gas purification unit; using at least the first quantity obtained, determining an installation density (dmounted) of the or each support element; determining at least one diameter (Denclosure) of the enclosure as a function of the determined installation density (dmounted) ; assembling the enclosure, the support element(s) and the gas purification unit, so as to obtain the diameter that was determined for the enclosure and the installation density (dmounted) that was determined for the support element(s).
Abstract:
An exhaust gas purifying member comprises a housing an exhaust gas purification block placed in the housing, and an exhaust gas purification block-retaining element inserted in an annular space between the housing and the block. The retaining element is, during manufacture of the member, made from a material including at least one nonfunctional component intended to disappear after a characteristic period of using the member. A method of manufacturing the member comprises assembling the housing, the retaining element, and the exhaust gas purification block to obtain a housing whereof a diameter is equal to a predetermined diameter, and with the installation density of the retaining element being equal to a target installation density after the characteristic usage period of the member.
Abstract:
A device for depolluting a heat engine exhaust gases includes an outer casing (23) including successive first and second tubular sections (38, 40), the first section (38) containing a first depolluting member (18) mounted in the passage, the first section including a female end (42) wherein is nested a male end (44) of the second section (40). The first depolluting member (18) includes a substrate (19) and at least one wedge (50, 52) interposed between the inner surface of the first tubular section (38) and the substrate (19), the (or each) wedge (50, 52) consisting of a wire mesh associated with a heat-expansible material to provide exhaust gas proofness.