# US 2019/0170043 A1 · Muffler for single-cylinder diesel engine

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- Number: US 2019/0170043 A1
- Document ID: US20190170043A1
- Status: Published application
- Kind: A1
- Application number: 16/257,705
- Filed: 2019-01-25
- Published: 2019-06-06
- Earliest claimed: 2016-07-26
- Assignees: Motorenfabrik Hatz GmbH & Co. KG
- Applicants: Motorenfabrik Hatz GmbH & Co. KG
- Inventors: Tobias WINTER; Wolfgang DORNER
- Web page: https://patentgrep.com/patent/US20190170043A1

## CPC

- F01N 3/2885: {with exhaust silencers in a single housing}
- F01N 1/006: {comprising at least one perforated tube extending from inlet to outlet of the silencer}
- F01N 1/089: {using two or more expansion chambers in series (F01N1/083, F01N1/084, F01N1/086 take precedence)}
- F01N 1/165: {for adjusting flow area}
- F01N 13/1805: {Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K)}
- F01N 13/1855: {the connection being realised by using bolts, screws, rivets or the like}
- F01N 13/1872: {the assembly using stamp-formed parts or otherwise deformed sheet-metal}
- F01N 13/1888: {the housing of the assembly consisting of two or more parts, e.g. two half-shells}
- F01N 1/026: {Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage}
- F01N 1/085: {throttling exhaust gas flow using a central core in a flow passage}
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 13/143: {with air filling the space between both walls}
- F01N 2230/04: Catalytic converters
- F01N 2260/20: for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
- F01N 2450/22: by welding or brazing
- F01N 2450/24: by bolts, screws, rivets or the like
- F01N 2490/04: the gases flowing longitudinally from inlet to outlet only in one direction
- F01N 2490/06: the gases flowing longitudinally from inlet to outlet in opposite directions
- F01N 2490/155: being disposed one after the other in flow direction
- F01N 2490/16: Chambers with particular shapes, e.g. spherical
- F01N 2590/06: for hand-held tools or portables devices
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

## Abstract

A muffler for single-cylinder diesel engines with an integrated oxidation catalyst is provided, such that the muffler is connected to the cylinder head of the engine, that the muffler housing is divided into two chambers, that is, an inlet chamber and an outlet chamber, by means of an intermediate wall and that the oxidation catalyst is secured in the intermediate wall such that it fludically connects together both chambers.

## Claims

### Claim 1

A muffler for a single-cylinder diesel engine having an oxidation catalyst in the muffler housing, which is attached to the cylinder head of the engine, wherein the muffler housing is divided by an intermediate wall (3) into two chambers and the oxidation catalyst (28) is fastened in the intermediate wall (3) in such a way that it places two chambers fluidically in communication with one another, and wherein an outlet chamber (5) of the muffler, connected downstream from the intermediate wall (3) in flow direction, is joined in gas-tight manner to an outlet pipe (10) for the post-treated exhaust gas, wherein:
the muffler housing is attached by means of a flanged joint directly to the cylinder head and the intermediate wall (3) has openings for gas-tight installation of mounting pipes (14), which traverse the muffler housing and at their engine-side ends are fastened to the inside of a muffler-side attachment flange (9) in association with its joint bores (15), for the purpose of applying a screw coupling of the attachment flange (9) to a corresponding flange part of the cylinder head.

### Claim 2 (depends on 1)

The muffler of claim 1, wherein the muffler-side attachment flange (9) is welded at its lateral periphery in a gas-tight manner to an embossment (22) of the muffler housing encircling it.

### Claim 3 (depends on 1)

The muffler of claim 1, wherein the intermediate wall (3) is fastened in a gas-tight manner between two housing parts of the muffler housing.

### Claim 4 (depends on 1)

The muffler of claim 1, wherein the intermediate wall (3) has an opening for the penetration, in a gas-tight manner, of the catalyst body (28).

### Claim 5 (depends on 1)

The muffler of claim 1, wherein the intermediate wall (3) has an opening for receiving the closed inner end of the exhaust pipe (10) in a gas-tight manner.

### Claim 6 (depends on 5)

The muffler of claim 5, wherein the inner end of the outlet pipe (10) projects into an inlet chamber (4) of the muffler housing connected upstream from the intermediate wall (3) and is braced displaceably there in an associated indentation of the housing rear wall (1) of the muffler housing.

### Claim 7 (depends on 1)

The muffler of claim 1, wherein the outlet pipe (10) is designed to be perforated in its portion inside the outlet chamber (5) of the muffler housing.

### Claim 8 (depends on 1)

The muffler of claim 1, wherein the intermediate wall (3) is designed to be dish-shaped with convex bulge toward the exhaust gas flowing into the inlet chamber (4) of the muffler.