Catalyst-attached muffler for internal combustion engine
a catalytic converter and muffler technology, which is applied in the direction of engines, mechanical equipment, machines/engines, etc., can solve the problems of insufficient utilization of the purifying capacity of the catalyst b>30/b>′, and achieve the enhancement of the purifying performance the ability to enhance the reactive capacity of the catalyst, and the temperature of the exhaust gas to be introduced into the catalyst.
Inactive Publication Date: 2006-01-19
KIORITZ
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Benefits of technology
[0015] According to the catalyst-installed muffler of the present invention, since the exhaust gas-purifying catalyst is cylindrical or prismatic in configuration, and an outer circumferential cross-sectional configuration of the catalyst is made identical with an inner circumferential cross-sectional configuration of the outer end portion of the exhaust port, it is possible to enable one end portion of the catalyst (i.e. the exhaust gas-introducing side thereof) to fit substantially hermetically in an outer end portion of the exhaust port, thereby making it possible to make the entire region of the catalyst available for the purification of the exhaust gas. As a result, it is now possible to utilize the purifying capacity of the catalyst to a maximum extent and hence to greatly enhance the exhaust gas purifying performance of the catalyst.
[0016] Further, since part of the catalyst is introduced into the exhaust port, the temperature of exhaust gas to be introduced into the catalyst can be kept higher as compared with the conventional muffler. As a result, the reactive capacity (activation) of catalyst can be enhanced, thus making it possible to further enhance the exhaust gas purifying capacity of the catalyst.
[0017] Furthermore, since the catalyst is positioned close to the exhaust port (combustion chamber), the distance between the distal end (exhaust gas discharging side) of the catalyst and the exhaust outlet port of muffler can be elongated. As a result, the temperature of exhaust gas at the exhaust outlet port of muffler can be much lowered.
Problems solved by technology
Thus, the conventional catalyst-installed muffler 20′ is accompanied with the problem that the purifying capacity of the catalyst 30′ is not sufficiently utilized.
Method used
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Embodiment Construction
[0023] Next, one embodiment of the muffler according to the present invention will be explained with reference to the drawings.
[0024] Just like the conventional internal combustion engine shown in FIG. 4, an internal combustion engine 1 shown in FIG. 1 is a small air-cooled two-stroke gasoline engine of Schnürle type scavenging system which can be mounted as a power source on a portable power working machine such as a brush cutter or a chain saw. The displacement of the engine 1 may be about 23 to 45 mL for example. This engine 1 is provided with a cylinder 2 having a domed combustion chamber 5. The cylinder 2 is provided with a large number of cooling fins 6 on the outer circumference thereof. Moreover, the cylinder 2 is provided with an exhaust port 10 which is circular in cross-section as shown in FIG. 2 and generally tapered in configuration (bell-like), i.e. the cross-sectional area of the exhaust port 10 is gradually increased from the inner end (cylinder bore 2a side) to the...
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A catalyst-installed muffler includes an expansion chamber (25), and a gas-permeable exhaust gas-purifying catalyst (30), wherein exhaust gas blown out of the exhaust port (10) of an internal combustion engine is introduced into the expansion chamber (25) through the catalyst (30). The catalyst (30) may be cylindrical in configuration. An outer circumferential cross-sectional configuration of the catalyst (30) is made identical with an inner circumferential cross-sectional configuration of the outer end portion (10a) of the exhaust port (10), so that one end portion (exhaust gas introducing side 30a) of the catalyst (30) is enabled to fit in an outer end portion (10a) of the exhaust port (10). According to this muffler, it is made possible to utilize the purifying capacity of the catalyst to a maximum extent.
Description
FIELD [0001] The present invention relates to a muffler with catalytic converter which is provided with an expansion chamber and with an exhaust gas-purifying catalyst. In particular, the present invention relates to a muffler with catalytic converter which is suited for use in a small air-cooled two-stroke gasoline engine for use in a portable power working machine such as a brush cutter or a chain saw. BACKGROUND INFORMATION [0002] In recent years, even in an internal combustion engine such as a small air-cooled two-stroke gasoline engine to be employed in a portable power working machine such as a brush cutter or a chain saw, it is strongly demanded, as in the case of on-vehicle engine, to minimize the quantity of hydrocarbon (HC), carbon monoxide (CO), etc. in the exhaust gas. Accordingly, it has been proposed to mount an exhaust gas-purifying catalyst inside the muffler installed on the exhaust gas system of the engine so as to enable the exhaust gas to pass through the catalys...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01N3/10
CPCF01N3/2885F01N13/0097F01N2230/04
InventorYAMAGUCHI, SHIROUKOGA, NAOKINOZAWA, MASARU
OwnerKIORITZ