Arrangement for the mounting of exhaust gas lines

Details Arrangement for the mounting of exhaust gas lines Arrangement for the mounting of exhaust gas lines

1988-02-02

1989-02-28

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having vibration attenuating, or expansion and contraction...

60323, F01N 710

Patent

active

048074365

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an arrangement for the mounting of exhaust gas lines according to the preamble of the claim 1, as is disclosed, for example, from the DE-OS No. 31 50 001.
An internal combustion engine with V-shaped row arrangement of the cylinders is illustrated in the aforementioned DE-OS No. 31 50 001. The exhaust gas manifold as well as the exhaust gas lines conducting the combustion gases from the exhaust openings of the cylinder heads to the exhaust gas manifold are located completely in an exhaust gas-tight space which is formed by the V-shaped section of the cylinder crankcase covered by a cover hood. Owing to the arrangement inside of the exhaust gas-tight space, the exhaust gas lines need not be cooled, as a result of which the energy content of the exhaust gases remains preserved and the supercharging is improved. However, by reason of the high temperatures, also greatest demands are made of the material and construction of the exhaust gas lines and of their mountings. The exhaust gas lines are fixed at the exhaust gas manifold in plug connections. The other ends terminate freely in the exhaust openings at the cylinder head. With the mounting at the exhaust gas manifold, the forces which occur as a result of temperature strain are relatively small because a corresponding temperature strain takes place owing to the approximately equally high temperatures of the exhaust gas lines and of the exhaust gas manifold. As the ends on the cylinder head side are free, in particular also an unimpaired length expansion free of compulsive forces is possible. However, radially acting clamping forces within the area of the plug connection cannot be avoided which are necessary for a safe seat of the exhaust gas lines. However, in the full load operation of the internal combustion engine, the temperatures of the exhaust gases and therewith of the exhaust lines are so high that the material is no longer able to withstand even small forces. This leads to permanent deformations within the clamping area as a result of the clamping forces acting thereat and therewith to the decline of the clamping action when cooling off. Especially in the partial load operation, no secure, completely satisfactory seat of the exhaust gas lines is then assured any longer. With continuous dynamic load, this would lead very quickly to damages of the exhaust gas line system. Furthermore, the construction of the plug-in mounting is quite expensive. In particular also welding seams can not be avoided which represent weak places under high temperature load.
Exhaust gas manifold pipe and exhaust gas lines of an internal combustion engine disclosed in the DE-PS No,. 26 53 263 are also arranged in an exhaust gas-tight space. The exhaust gas manifold is assembled in that case of pipe sections one plugged into the other, which is to permit an unimpaired length compensation. It is disadvantageous that the exhaust gas lines which conduct the combustion gases from the cylinder heads to the exhaust gas manifold, are welded onto the pipe sections of the exhaust gas manifold. On the side of the cylinder head, the exhaust gas lines are securely bolted at flanges each by means of two bolts to the water-cooled housing of the exhaust gas-tight space. As the flanges are thus cooled, they are capable without difficulty to absorb strain deformations which result from the clamping-in by several fastening bolts. However, in this case, a complicated water-cooled housing is needed which also includes the area of the cylinder head exhaust openings.
The invention is based on the task to so mount the exhaust gas lines that with a view toward the optimum supercharging without disturbing cooling of the exhaust gas lines and of the fastening area no significant forces occur in the clamping area in all temperature ranges and especially also at highest temperatures, and nonetheless a safe and immovable seat of the exhaust gas lines is assured.
This task is solved with an arrangement of the aforementioned type by the characterizing features of the claim 1. By one-

REFERENCES:
patent: 3941409 (1976-03-01), Rameau
patent: 4117671 (1978-10-01), Tadokoro
patent: 4197704 (1980-04-01), Date
patent: 4458491 (1984-07-01), Deutschmann

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