Power plants – Internal combustion engine with treatment or handling of... – Having vibration attenuating – or expansion and contraction...
Patent
1988-06-08
1989-09-26
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having vibration attenuating, or expansion and contraction...
60323, F01N 710
Patent
active
048690643
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to an exhaust gas line for supercharged piston internal combustion engine. Such encased exhaust gas lines effect a minimal heat loss from the exhaust gas and are used in applications which require low surface temperatures.
An exhaust gas line of the aforementioned type is known from the DE-OS 34 45 916. During the operation the inner line conducting the exhaust gas is subjected to high alternating loads by reason of a high exhaust gas temperature, of the pulsating exhaust gas flow and of the vibrations stemming from the piston internal combustion engine. A particular problem is the operationally reliable fastening of the inner line having nearly exhaust gas temperature at the surrounding housing, cooled under some circumstances. The thermal expansion differences by reason of different and changing temperatures between the fastening devices of the inner line and the housing effect relative movements which lead to local friction wear. Additionally, welded connections at the carrying elements of the inner line are particularly susceptible to cracking at the occurring alternating loads.
It is therefore the task of the invention to create for an exhaust gas line of the aforementioned type an inner line in which no welded connections are required. The shape which is given to the channel-shaped parts, renders superfluous welded connections at the inner line and reduces the cracking sensitivity. Prestress produced during the assembly in the channel-shaped parts by the spreading, which in cold condition represents a completely non-critical load for the structural components, is compensated when reaching the operating temperature by reason of the thermal expansion. The structural component stresses which are otherwise produced by thermal expansion and are critical at high temperature, do not exist in the exhaust gas line according to the invention.
Relative movements between housing and inner line are avoided during temperature change by the arrangement of the bolts for fastening the inner line and the gas forces occurring during the operation are diverted into the housing without any deformations resulting at the inner line.
The advantages achieved with the invention reside in particular in that the channel-shaped parts of the sections for the inner line can be made particularly economically from sheet metal, in that a reduced material stress results at operating temperature of the inner line owing to the prestress, in that inexpensive material with less highly developed heat resistance can be used thereby for the manufacture of the channel-shaped parts and in that an operationally reliable and at the same time weight-saving manner of construction of the exhaust gas line has been found with the proposed construction of the inner line.
An embodiment of the invention is illustrated in the drawings and will be described more fully hereinafter. It is shown:
FIG. 1 top plan view of the installed inner line of an exhaust gas line;
FIG. 2 cross section of an exhaust gas line according to lien II--II in FIG. 1;
FIG. 3 cross section through a fastening device for the cover strips according to line III--III in FIG. 2;
FIG. 4 cross section through a fastening device for the channel-shaped parts according to line IV--IV in FIG. 2;
FIG. 5 elevational view of an end of the inner line with a one-piece cover;
FIG. 6 elevational view of an end of the inner line with two-partite cover;
FIG. 7 cross section through the fastening device of a cover of the inner line according to line VII--VII in FIG. 5;
FIG. 8 cross section of an end of the inner line according to line VIII--VIII in FIG. 6;
FIG. 9 elevation of an end of the inner line with for-partite cover;
FIG. 10 cross section in the end area of the inner line according to line X--X in FIG. 9;
FIG. 11 cross section through a fastening device of an end section of the inner line according to line XI--XI in FIG. 1.
In a supercharged, multi-cylinder piston internal combustion engine an exhaust gas line is disposed in the space of the cylinder crankcase
REFERENCES:
patent: 3727410 (1973-04-01), Scheitlin
patent: 4182122 (1980-01-01), Stratton
patent: 4658580 (1987-04-01), Schley
Hart Douglas
MTU Friedrichshafen GmbH
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