Exhaust silencer arrangement

Details Exhaust silencer arrangement Exhaust silencer arrangement

1999-01-25

2000-12-12

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60299, 60312, 60323, 181212, 181227, 181255, 181258, 181269, 181272, 181282, F01N 300

Patent

active

06158214&

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention pertains to an exhaust muffler arrangement with an exhaust muffler of a multichamber design, especially for passenger cars.


BACKGROUND OF THE INVENTION

An exhaust system of a motor vehicle has been known to have the task of drawing off the exhaust gases formed during the combustion of the fresh fuel mixture in the engine with a low flow resistance and of allowing the exhaust gases to escape at a defined point of the vehicle. This point is often stipulated by law. For a low-noise discharge of the exhaust gases into the atmosphere, the exhaust system has an exhaust muffler arrangement, and frequently an exhaust gas cleaning equipment, a so-called catalytic converter, for discharging the exhaust gases with a low emissions level. The catalytic converter usually replaces the front muffler of the exhaust muffler arrangement in the exhaust line in such a combined prior-art system and is arranged upstream of the rear muffler and optionally also of the middle muffler.
The essential components of a catalytic converter are known to be the catalyst support with its precious metal coating, preferably a monolith, and its housing. Inlet and outlet funnels may be provided.
Distinction is made, in principle, among the exhaust muffler arrangements between baffle mufflers and absorption mufflers. Both design principles may also be combined in one exhaust muffler. The design and the mode of operation are fundamentally the same.


SUMMARY AND OBJECTS OF THE INVENTION

The basic object of the present invention is to provide an exhaust muffler arrangement of the type mentioned in the introduction, which has a simple design, can be operated effectively and is especially suitable for very small motor vehicles with 3-cylinder engines.
Provisions are made according to the present invention for the housing of the exhaust muffler to be composed of two half shells and for a catalytic converter module to be also accommodated in the half shell housing in an integrated manner, wherein the separate housing of a prior-art catalytic converter module may be omitted.
The catalytic converter module is preferably designed as a wall or divider dividing the half shell housing into a main chamber and an auxiliary chamber, wherein the chambers are connected to one another via at least one connection channel integrated within the half shell housing.
The auxiliary chamber is an empty space for increasing the volume and as such a resonator chamber or a Helmholtz resonator, which communicates with the main chamber.
A simple design and an expedient mounting are achieved if the catalytic converter is fastened in the half shell housing by positive locking and/or by welding.
The cross section of the half shell housing along the catalytic converter is preferably essentially the same this forms a means for receiving catalytic converters of different length. Depending on the wishes or the type of the vehicle, catalytic converter modules of equal cross section but with different monolith length can therefore also be inserted into the half shell housing in a positive-locking manner (modular design of the catalytic converter, and the other individual parts of the exhaust muffler arrangement to be described below, namely, the inner structure of the exhaust muffler and the housing, may be modular as well).
The catalytic converter module preferably has an oblique inlet funnel on the side of the auxiliary chamber and an open, i.e., outlet flow side without funnel at the side of the main chamber. The oblique flow leads to an optimal flow distribution with the advantage of a very short start-up time of the catalytic converter as well as a good long-term stability of the coating of the catalytic converter. Due to the open discharge from the catalytic converter without an outlet funnel, only a low exhaust gas pressure builds up during the operation and the loss of power is consequently minimal, which is especially important for engines with an exhaust gas turbocharger.
The oblique inlet funnel advantageously extends throug

REFERENCES:
patent: 4416350 (1983-11-01), Hayashi
patent: 4579194 (1986-04-01), Shiki et al.
patent: 4894987 (1990-01-01), Harwood et al.
patent: 5376341 (1994-12-01), Gulati
patent: 5392602 (1995-02-01), Matsumoto
patent: 5426269 (1995-06-01), Wagner et al.

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