Muffler

Inactive Publication Date: 2003-09-18
AB ELECTROLUX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0009] FIG. 2 shows a second embodiment of the invention provided with a reinforced cooling of t

Problems solved by technology

These problems are particularly characteristic for mufflers equipped with a catalytic converter element, which results in a high development of energy at combustion of the exhaust gases.
Furthermore, these problems are particularly significant for crankcase scavenged two-stroke engines provided with additional air to the upper part of their scavenging ducts for in this way reducing the scavenging losses of the engine.
Thereby exhaust gases with a great oxygen surplus will be created, which might result in an after-oxidation in the muffler.
This would result in that all combustible exhaust gas components are oxidized.

Method used

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Examples

Experimental program
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Embodiment Construction

[0016] In FIG. 1 numeral reference 1 designates a muffler, which is mounted directly to the exhaust gas outlet 3 of the cylinder 2. In the conventional way the muffler is composed of an inner half 30 and an outer half 31 assembled at a parting plane 32. The muffler can be either permanently or detachably assembled. The characteristic feature is that an upstream partition wall 4 is located inside the muffler, e.g. it can be welded at the inner muffler half 30. The partition wall 4 has preferably approximately the same angle as the engine's exhaust gas outlet. It reaches all the way up to the muffler's inlet 6 and is located somewhere in the middle of this. Hereby it separates an upper gas fraction 8 and a lower gas fraction 9. The partition wall 4 does not have to be gas-tight mounted around the walls of the muffler. Rather it could be an advantage if there is a certain leakage along the walls, so that a compensation of pressure can occur. Obviously, this leakage along a wall will be...

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Abstract

A muffler (1) intended for portable working tools, preferably chain saws, in which the muffler is mounted directly to the exhaust gas outlet (3) of the cylinder (2). The muffler is provided with at least one upstream partition wall (4, 5) at the muffler's inlet (6) from the cylinder and arranged essentially laterally in relation to the engine's cylinder bore (7), so that the partition wall (4) separates an upper fraction (8) above it, i.e. in the direction towards the upper side of the cylinder, and a lower fraction below it, i.e. in the opposite direction, and this dividing into two or several fractions (8, 9, 10) is kept maintained through a great deal of the muffler from the inlet to a number of outlets (11, 12, 13).

Description

[0001] The subject invention refers to a muffler intended for portable working tools, preferably chain saws in which the muffler is mounted directly to the exhaust gas outlet of the cylinder.[0002] In portable working tools usually the muffler is mounted directly to the exhaust gas outlet of the cylinder in a way as compact as possible. For these tools there is a very strong demand for a low total weight and small size. This leads to a demand for a small and light muffler. In the same time it is important that the user does not get injured if he comes into contact with the tool's muffler or its exhaust gases, or that the exhaust gases cannot set fire to adjacent objects. This has lead to the existence of special legal requirements concerning the muffler's surface contact temperature and the exhaust gas temperature in its vicinity. The working tool is usually equipped with a cooling fan and various safety covers around the cylinder and partly around the muffler. These problems are pa...

Claims

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Application Information

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IPC IPC(8): F01N1/08F01N1/16F01N3/28F01N13/00F01N13/08F02B63/02F02B75/02
CPCF01N1/08F01N1/089F01N1/16F01N3/2885F01N13/002F01N13/082F02B2075/025F01N2470/14F01N2470/16F01N2490/08F01N2590/06F02B63/02F01N2240/20
InventorANDERSSON, LARSBERGMAN, MIKAELSTROM, HANS
OwnerAB ELECTROLUX