Power plants – Internal combustion engine with treatment or handling of... – Exhaust gas or exhaust system element heated – cooled – or...
Patent
1995-11-13
1997-02-11
Kwon, John T.
Power plants
Internal combustion engine with treatment or handling of...
Exhaust gas or exhaust system element heated, cooled, or...
60323, F01N 710
Patent
active
056009500
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an exhaust gas pipe especially for charged multi-cylinder internal combustion engines.
BACKGROUND INFORMATION
Exhaust gas pipes with an encapsulation cause a minimal heat loss from the exhaust gas and are used preferably where the energy of the exhaust gas is to be converted into work in a down-stream turbo-charger or when the surface temperature of the exhaust gas pipe shall be kept low.
German Patent Publication (DE-PS) 3,635,478 discloses an encapsulated exhaust gas pipe for a turbo-charged internal combustion engine. An inner duct for the exhaust gases is arranged in a gas-tight housing. The inner duct is assembled from individual sections, whereby the length of one section corresponds approximately to the spacing between cylinders of the internal combustion engine. The sections consist each of two groove-type channels with flanges. The flanges are connected to the housing by screws. Cover strips apply a force to the groove-type channels to damp vibrations of the groove-type channels.
The production of the inner sections of two parts leads to increased costs in keeping these parts in stock and in mounting these parts. The mounting of the exhaust gas pipe with cover strips requires a careful adaptation and is thus cost intensive.
OBJECT OF THE INVENTION
It is the object of the present invention to provide an exhaust gas pipe which is economical, vibration damped and simple to mount.
SUMMARY OF THE INVENTION
The object has been achieved in an exhaust gas pipe for a multi-cylinder charged internal combustion engine with an outer gas-tight housing and an inwardly disposed exhaust gas pipe made of single piece cast segments, the length of which corresponds to the cylinder spacings of the internal combustion engine, according to the invention in that the segments comprise projections opposite an inlet opening at the circumference of the segments, wherein the projections rest against projections of the gas-tight housing provided at the inner circumference thereof, and wherein the segments are connected at this point to the gas-tight housing by screws which are externally accessible.
The inwardly disposed hot gas pipe can be produced in an especially cost efficient manner by lost wax (precision) casting or by normal casting. The segments can be provided already during the production with projections for the screw holes without any additional costs. A cost intensive separate stocking of different components is avoided. It is no longer necessary during the mounting of the segments to the outer housing of the exhaust gas pipe to assemble separate components possibly at locations that are difficult to access. Rather, the mounting is very much simplified with a single segment that can be connected externally by means of screws. The compensation of heat stresses between components of the inner hot gas pipe during operation of the exhaust gas pipe is no longer needed. The support of the segments takes place at the projections so that vibrations are substantially suppressed.
Preferably each of the segments is secured with two screws at the outer housing, whereby the screws extend crosswise or lengthwise next to each other. This is an especially cost efficient method to connect the segments with the outer housing in a manner secure against torque loads.
According to a further advantageous embodiment of the present invention the segments are screwed to the outer housing at positions respectively opposite of the gas inlet openings from the internal combustion engine into the exhaust gas pipe. Due to the fact that the gas impulses are directed from the combustion engine directly onto the screw connection of the segments with the outer housing, the segment is hardly excited to generate vibration, so that an additional device for vibration damping is not needed.
An especially flow efficient embodiment of the inner hot gas pipe which is stable in itself is achieved with tubular segments having a circular or oval cross-section.
Preferably, the outer housing is provided
REFERENCES:
patent: 4168610 (1979-09-01), Engquist
patent: 4179884 (1979-12-01), Koeslin
patent: 4184329 (1980-01-01), Ruesch
patent: 5189879 (1993-03-01), Sudmanns
patent: 5337559 (1994-08-01), Deutschmann
patent: 5495873 (1996-03-01), Butkiewicz et al.
Fasse W. F.
Fasse W. G.
Kwon John T.
MTU Motoren-Und Turbinen-Union Friedrichshafen GmbH
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