JPS591047Y2 - Exhaust gas purification device for small engines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an exhaust gas purification device for a small engine used in a motorcycle or the like.

BACKGROUND ART Some large engines such as automobiles have a purifying cylinder containing a catalyst body connected to the exhaust system to purify the exhaust gas.

However, small-sized engines such as motorcycles cannot be equipped with such a purifying cylinder because there is not enough space for it.

In view of this point, this invention is designed to be able to be installed on motorcycles, etc., and an embodiment of the invention shown in the drawings will be described below.

The catalyst body 1 is made of a honeycomb-shaped ceramic coated with a catalyst agent, with cushioning material 2 placed on the outer periphery of the front and rear ends, and a steel part 3.
Insert inside.

Then, both ends of the steel part 3 are caulked and integrated.

On the other hand, the rear end of the exhaust pipe 4 is widened into a large diameter section 5, and the front end of a connecting pipe 6 such as a second exhaust pipe or a muffler connected thereto is widened into a large diameter section 7.

Then, the steel part 3 containing the catalyst body 1 is inserted into the large diameter part 7, and the large diameter parts 5 and 7 are fitted and connected.

A gasket 8 is wrapped around this large diameter portion 5 and fastened with a band 9.

The effect will be explained.

The steel part 3 is stopped by hitting the large diameter part 1 and does not move.

Exhaust gas flowing through the exhaust pipe 4 comes into contact with the catalyst body 1, causes an oxidation reaction, and is purified.

The gasket 8 prevents leakage of exhaust gas and also insulates heat generated due to oxidation reaction.

As explained above, this invention covers the catalyst body with a steel part via a buffer material, widens the end of the exhaust pipe and the connecting pipe connected to the exhaust pipe to a large diameter part, and touches the large diameter part. The steel part containing the medium was inserted, a gasket was wrapped around the outer periphery of the large diameter part, and it was tightened with a band, so the catalyst body could be installed by simply making the connection part between the exhaust pipe and the connecting pipe slightly thicker, saving space. It can be equipped with a catalyst without removing it, and the exhaust gas can be purified by the catalyst.

Moreover, the steel part can be easily replaced by attaching and detaching the connecting part.

The catalyst body is integrated into the steel pipe, and the shock absorber provides durability against vibrations.

Additionally, the gasket can provide insulation as well as exhaust gas leakage.

In this way, the structure is simple and inexpensive, and it does not take up much space, making it ideal for small engines such as motorcycles.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Catalyst body, 2... Buffer material, 3... Steel part, 4...
... Exhaust pipe, 5... Large diameter part, 6... Connection pipe, 7...
・Thick diameter part, 8...gasket, 9...band.

Claims (1)

[Scope of utility model registration request] The catalyst body is covered with a steel part via a buffer material, and the end of the exhaust pipe and the connecting pipe connected to the exhaust pipe are widened into a large diameter part having an inner diameter that can contain the steel part, and inside the large diameter part. An exhaust gas purification device for a small engine characterized by inserting a steel part containing a catalyst body, wrapping a gasket around the outer periphery of the large diameter part, and tightening it with a band.