JP2541915Y2 - Exhaust filter for internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust filter of an internal combustion engine, particularly a diesel engine.

[0002]

2. Description of the Related Art As an apparatus for removing carbon and the like contained in exhaust gas of a diesel engine, as shown in FIG.
A filter body 3 made of ceramic or the like is arranged in an exhaust passage of an exhaust pipe 2 of the engine 1, and carbon and the like are collected by the filter body 3 to prevent clogging of the filter due to the collected components. In order to regenerate the fuel, a heater in which electricity is supplied from the battery 10 to the heater 11 to burn the trapped components is known.

The filter body 3 has a cubic shape as shown in FIG. 7, and has ribs 3a protruding around the upper and lower sides thereof. As shown in FIG. The end face of the rib 3a is gas-sealed and fixed with a sealing material 5 made of a heat-expandable ceramic material (trade name: Intram).

[0004]

In the above-mentioned conventional exhaust filter, the sealing function of the sealing member 5 may be deteriorated due to a heat cycle, vibration of a vehicle, or the like, and gas leakage may occur.

An object of the present invention is to provide an exhaust filter that solves the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a ceramic for removing black smoke which is mounted via a support frame in a casing installed in an exhaust passage of an internal combustion engine. In a filter made of a heat-resistant, oxidation-resistant metal, a rib cover made of a heat-resistant and oxidation-resistant metal is fitted to at least upper ribs of ribs protruding up and down around the filter body. It is characterized by being welded and sealed with bellows.

[0007]

According to the above construction, the metal bellows expands and contracts even if there is a thermal influence or vibration, so that the space between the filter body and the casing is reliably gas-sealed, and the filter body is supported.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 6 denotes a casing, and 4 denotes a support frame fixed in the casing 6 and having an L-shaped cross section or a rectangular tube. Reference numeral 3 denotes a filter body made of ceramic or the like, and ribs 3a are protruded from the upper and lower periphery thereof, which is the same as the conventional structure.

In the present invention, as shown in FIGS. 2 and 3, a rib cover 7 made of a heat-resistant and oxidation-resistant metal such as SUS is fitted to the rib 3a. Then, as shown in FIG. 2, at least the rib cover 7 fitted to the upper rib 3a and the support frame 4 are welded and sealed with a metal bellows 8 made of heat-resistant spring steel.

The lower rib 3a is provided with a rib cover 7 fitted on the lower rib 3a on the support frame 4, a sealing material 5 made of a heat-expandable ceramic material (trade name: Intram) or SUS.
It is supported and fixed via a wire mesh cushioning material. Also,
It can also be fixed at the upper rib 3a. The rib cover 7 may be directly supported and fixed to the support frame 4 without fitting the rib cover 7 to the lower rib 3a.

Further, as another design modification example, as shown in FIG. 4, a U-shaped sealing material 5 made of a heat-expandable ceramic material (trade name: Intram) or a sealing material 5a shown in FIG. The rim cover 7 is fitted, and the rib cover 7 fitted to the upper rib 3a and the support frame 4 are welded and sealed with a metal bellows 8 made of heat-resistant spring steel in the same manner as described above. Alternatively, the rim cover 7 fitted to the sealing frame 5 or a wire mesh cushion material such as a SUS material may be supported and fixed to the support frame 4.

Since the present invention has the structure as described above, the relationship between the filter body 3 made of ceramic having a large difference in the coefficient of thermal expansion and the iron casing 6 affects the expansion and contraction due to heat and the vibration of the vehicle. However, the metal bellows 8 expands and contracts following this, ensuring a gas seal between the filter body 3 and the casing 6, and the metal bellows 8 is welded to the rib cover 7 and the support frame 4. Therefore, the filter main body 3 is securely fixed to the casing 6.

When a rib cover 7 is fitted to the lower rib 3a, and the rib cover 7 is supported and fixed to the support frame 4 via a sealing material 5 made of a heat-expandable ceramic material (trade name: Intram), the sealing material is used. The sealing effect by the thermal expansion of FIG. 5 is obtained, and this is the same in the structure of the modified example of FIGS.

[0014]

As described above, the present invention is directed to a filter made of black smoke removing ceramic or the like which is mounted via a support frame in a casing installed in an exhaust passage of an internal combustion engine. A rib cover made of a heat-resistant, oxidation-resistant metal is fitted to at least the upper rib protruding to the periphery, and the rib cover and the support frame are welded and sealed with a metal bellows made of a heat-resistant spring steel or the like. There is an advantage that the gas seal is reliably performed even if there is an influence due to a difference in thermal expansion / contraction between the filter main body and the casing, vibration, or the like, and that the filter main body is supported and fixed to the casing.

[Brief description of the drawings]

FIG. 1 is a sectional view of the present invention.

FIG. 2 is an enlarged view of a part viewed from an arrow A in FIG. 1;

FIG. 3 is an enlarged view of a portion viewed from an arrow B in FIG. 1;

FIG. 4 is a cross-sectional view of a modified example of the present invention.

FIG. 5 is a sectional view of a modified example of the present invention.

FIG. 6 is an explanatory view of an exhaust black smoke removing device for an engine.

FIG. 7 is a perspective view of a filter body.

FIG. 8 is a sectional view of a conventional sealing structure of a filter body.

[Explanation of symbols]

 Reference Signs List 3 Filter body 3a Rib 4 Support frame 5 Seal material 6 Casing 7 Rib cover 8 Metal bellows

Claims (1)

(57) [Scope of request for utility model registration] 1. A filter made of ceramic or the like for removing black smoke mounted via a support frame in a casing installed in an exhaust passage of an internal combustion engine at least above ribs protruding up and down around the filter body. A rib cover made of a heat-resistant and oxidation-resistant metal is fitted to the rib, and the rib cover and the support frame are welded and sealed with a metal bellows made of a heat-resistant spring steel or the like.