Abstract:
A catalyst assembly includes a housing having at least first and second recesses with side surfaces, and a catalyst carrier body fixed in said housing. The catalyst carrier body has a casing tube and a honeycomb body through which an exhaust gas can flow. The casing tube has at least first and second protuberances with side surfaces and said casing tube is connected to said honeycomb body at least in a partial region. The protuberances extend at least partially into said recesses to form a fixed mounting and at least one floating mounting with an axial mounting play. The assembly ensures that the catalyst carrier body is permanently fixed, in particular during structure-borne vibrations that occur in the exhaust system of an internal combustion engine.
Abstract:
An exhaust gas purification device for motor vehicles has a monolith which is disposed in a housing and has a front facade and a rear facade respectively extending transversely to the central longitudinal axis of the housing. A gap region is disposed between the monolith and a section of the housing. The monolith is directly or indirectly supported on by at least one facade on individual holding elements fixed to the housing. The holding elements extend approximately radially inwards and overlap the facade.
Abstract:
Disclosed herein are exhaust treatment devices comprising a lock-seam and methods of assembling the same. In one embodiment, the exhaust treatment device comprises: a substrate, a mat disposed around the substrate, and an upstream shell half and a downstream shell half disposed around the mat. The upstream shell half and the downstream shell half are connected by a lock-seam that is disposed between an upstream face and a downstream face of the mat. In one embodiment, the method for producing an exhaust treatment device comprises: assembling a mat around a substrate to form a substrate/mat sub-assembly, disposing an upstream shell half and a downstream shell half around the substrate/mat sub-assembly, and forming a lock-seam that connects the upstream shell half to the downstream shell half such that the lock-seam is disposed between and upstream end and a downstream end of the mat.
Abstract:
A catalytic converter unit includes walls defining a treatment zone, first and second transfer zones and at least one through-flow zone, which zones are adjacent each other. The walls include a partition wall that divides the treatment zone into first and second segments. The first transfer zone is plugged upstream of the partition wall and the second transfer zone is plugged downstream of the partition wall. A catalytic converter element is disposed in the first segment of the treatment zone, spaced from the partition wall. The first segment of the treatment zone is in flow communication with the first transfer zone and the second segment of the treatment zone is in flow communication with the second transfer zone.
Abstract:
A converter case with prominent reliance/endurance in spite of a smaller number of parts and inexpensiveness. Contents 3 and 4 of a catalyst carrier etc. are received in a multistage state within a converter case 2, which has openings 7 and 8 at both ends of a metallic pipe 6. The converter case 2 is formed of accommodating pipe portions 11 and 12 and a connecting pipe portion 13. The accommodating pipe portions 11 and 12 allow for accommodating the contents 3 and 4. The connecting pipe portion 13 connects the accommodating pipe portions 11 and 12 to one another. A radially reduced part 14 is integrally formed on the connecting pipe portion 13.
Abstract:
A metallic carrier for a catalytic converter in which a brazing foil material 7 is wound around an outer periphery of an exhaust gas outlet side of a core 5 formed by superposing one on top another a corrugated sheet 1 and a flat sheet 3 formed of a metal sheet and by rolling them, and an assembly thereof is press-fitted into a metallic outer cylinder 15 and is subjected to heat treatment so as to diffusionally join together the corrugated sheet 1 and the flat sheet 3 and join together an inner periphery of the outer cylinder 15 and an outer periphery of the core 5 by a brazing material 7-1, is characterized in that a solder-rising preventing groove 19 is provided over an entire circumference of the inner periphery of the outer cylinder 15 at a position located on an exhaust gas inlet side of an area for joining the core 5.
Abstract:
The flexible catalyst mounting system employing a "v" notch for holding flexible catalyst elements. Between any pair of rings a flexible catalyst element or plurality of elements, a stack, are placed. The rings placed between flexible catalyst elements or stacks are designed such that linear compression of a ring forces the ring to axially expand, thereby providing a radial seal to prevent gases from bypassing the flexible catalyst element or stack. The flexible catalyst mounting system can be used with flexible catalyst elements of varying ductility.
Abstract:
An apparatus for silencing and catalytic treatment of gases has an air-tight casing connected to an exhaust inlet pipe and to an exhaust outlet pipe, acoustic compartments, monolithic bodies, and a diffuser element. The diffuser element is connected to the inlet pipe, or further downstream within the casing. The diffuser element distributes the gases evenly across the inlet face of the monolithic bodies. The diffuser element is a guide baffle or plate and a juxtaposed stagnation baffle or plate, which causes both flow stagnation in front of the stagnation plate and the gases to flow radially within the diffuser element. The diffuser element has apertures which are pervaded by partial flows of the gas and are adapted to provide additional recovery in the gas flow passing through the diffuser element. The geometry defining the fluid flow field within the diffuser is designed to prevent flow separation from the contour walls of the diffuser.
Abstract:
The invention relates to an exhaust gas muffler for a two-stroke engine of a portable handheld tool such as a chain saw. The exhaust gas muffler includes a catalyzer wherein high exhaust gas temperatures are developed because of the exothermal reaction which takes place therein. The catalyzer is located in the forward portion of a gas-tight hollow body mounted in the housing of the muffler. The hollow body has a tapered portion which extends out of the housing in the direction of the exhaust gas flow. In this way, the surface temperature of the muffler housing is reduced.
Abstract:
A monolithic catalytic converter has a two-piece slip pin that extends through a monolithic substrate and is connected at its opposite ends to the housing so as to retain the substrate therein while freely allowing differential thermal expansion between the slip pin and the housing to accommodate thermal mismatch between these components.