Tenneco Automotive Operating Company Inc.

Other

Ruth Ann Latham

William Victor Alcini

Steven A Freis

Stephen Joe Myers

Michael A Golin

Keith G Olivier

Gabriel S Salanta

Mark Kluesner

Michael Joseph Torzewski

An exhaust gas treatment device, which includes an outer layer, an inner layer that is at least in part disposed within the outer layer, and a loose-fill insulation disposed in the volume between the outer layer and the inner layer, where a piece of fiber mat is disposed between the outer layer and the inner layer and forms a barrier that at least partially prevents the loss of the loose-fill insulation from the volume between the outer layer and the inner layer and a manufacturing method that includes placing a loose-fill insulation into the volume of space between an inner layer and an outer layer and positioning a piece of fiber mat between the outer layer and the inner layer to form a barrier that at least partially prevents the loss of the loose-fill insulation from the volume of space between the outer and inner layers.

Loose-fill insulation exhaust gas treatment device and methods of manufacturing

A method is provided for producing an exhaust gas aftertreatment or acoustic device () having a maximum operating temperature T. The method includes the steps of providing a blanket () of silica fiber or alumina insulation material having a weight percentage of SiOor AlOof greater than 65%; calcining the insulating material by heating the blanket () so that all of silica fiber insulation material is raised to a temperature T greater than T; and securing the blanket () on the device () after the calcining step. The blanket is encapsulated in a covering prior to the securing step, and before or after the calcining step, with the covering between the blanket and the device being a selected one of foil, wire mesh, or siliconized fiber glass.

Method of producing an insulated exhaust device

An exhaust treatment unit including a longitudinal core around an axis, a support mat, and powdered insulation impregnated between first and second layers of the support mat. In assembly, the mat is first wrapped around the core once, and powdered insulation is applied to the surface of the unwrapped portion of the mat prior to further winding whereby powdered insulation is disposed between mat layers after further winding.

Method of installing a multi-layer batt, blanket or mat in an exhaust gas aftertreatment or acoustic device

A catalytic unit, a process for providing a support mat for the catalytic unit, and a process for assembling the catalytic unit are provided. An installed mat density for the support mat being calculated based upon a desired annular cross-sectional area of a gap between a catalyst carrier and a shell of the catalytic unit, with the support mat being sandwiched therebetween. The support mat for the catalytic unit can be provided by first slitting a bulk roll of support mat to form a plurality of end unit specific mat rolls. The support mat can be wrapped around the catalytic carrier to form multiple layers of support mat, with the support mat having beveled leading and trailing edges to reduce variation in material density in the layers of support mat overlying and underlying the leading trailing edges. The support mat can be free of any binder.

Catalytic unit for treating an exhaust gas and manufacturing methods for such units

A method is provided for installing a multi-layer mat () in an exhaust gas aftertreatment or acoustic device. The method includes the steps of wrapping the mat () around an inner surface of the device along the same plane for at least a complete wrap around the inner surface; subsequently wrapping the mat () around the already completed wrap such that each of the successive wraps of the mat () are offset a constant distance from the plane of the previous wrap; a final wrap of the mat () wherein the mat is wrapped along a final plane for at least a complete wrap around the catalyst; and installing the mat () in the device () after the wrapping steps.

Method of installing a longitudinally offset multi-layer mat in an exhaust gas aftertreatment or acoustic device

A method is provided for providing external insulation for an exhaust gas aftertreatment or acoustic device, including the steps of (a) securing an insulating blanket around the exterior of the device, (b) securing a sheet of foil around the insulating blanket, (c) interconnecting a plurality of wires into a sleeve oriented in an axial direction by knitting or interweaving, whereby extending the sleeve in the axial direction biases the sleeve radially inwardly, (d) positioning the wire sleeve around the foil sheet, (e) welding one end of the wire sleeve to the device adjacent one end of the insulating blanket, (f) pulling the other end of the sleeve in the axial direction to bias the sleeve radially inwardly sufficiently to apply a compressive force to the insulating blanket, and (g) welding the other end of the sleeve to the device adjacent the other end of the insulating blanket.

Growing community of inventors

Ann Arbor, MI, United States of America

Ruth Ann Latham