JP6830694B2 - Mounting structure of catalyst carrier - Google Patents

Description

The present invention relates to a mounting structure of a catalyst carrier capable of efficiently purifying exhaust gas at a position relatively close to the combustion chamber of an internal combustion engine.

For example, Patent Document 1 has been proposed with respect to providing a catalyst for exhaust gas purification at a position relatively close to a combustion chamber of an exhaust flow path in an internal combustion engine. Here, installing a catalyst for exhaust gas purification at a position relatively close to the combustion chamber of the exhaust flow path in the internal combustion engine raises the temperature of the catalyst by the combustion of the internal combustion engine or the heat of the exhaust gas to quickly activate the catalyst. Because it can be done.

In Patent Document 1, as shown in FIG. 3 , when the catalytic converter 12 is provided in the flow path of the exhaust pipe 11 connected from the engine E, the catalytic converter 12 is used in both the axial direction and the radial direction of the exhaust pipe 11. It solves the problem that the catalytic converter 12 cannot be provided in the vicinity of the engine E, in particular, when the exhaust pipe immediately after the engine is bent as in a two-wheeled vehicle, which is large and restricts the arrangement space. Therefore, we propose the following.

That is, in Patent Document 1, a tubular portion to be inserted into the branch pipe is provided in a gasket interposed between each combustion chamber of the internal combustion engine and each branch pipe of the manifold, and a catalyst layer is provided on the inner and outer surfaces of the tubular portion. I am trying to provide it.

In the configuration described in Patent Document 1, since the catalyst layer for exhaust gas purification is located in the exhaust flow path near the combustion chamber of the internal combustion engine, there is an advantage that a separate space for providing the exhaust gas purification configuration is not required. There is.

However, in the configuration described in Patent Document 1, since the catalyst layer is provided on a surface parallel to the flow direction of the exhaust gas, even if the exhaust gas in contact with the catalyst layer is purified, for example, in the exhaust flow path. The exhaust gas flowing through the central portion of the tubular portion does not come into contact with the catalyst layer, and as a result, unpurified exhaust gas may occur, and there is a problem that the purification efficiency is poor when viewed from the entire exhaust gas amount.

Japanese Unexamined Patent Publication No. 2001-50043

The problem to be solved by the present invention is that in the technique described in Patent Document 1, since the catalyst layer is provided on a surface parallel to the flow direction of the exhaust gas, the exhaust gas flowing in the central portion of the exhaust flow path is purified. However, the exhaust purification efficiency is poor.

In the mounting structure of the catalyst carrier of the present invention, the catalyst carrier carrying the catalyst substance is used as a mounting portion for the exhaust gas purification portion and the outer edge, and the penetration portion is provided in the mounting portion so that the purification portion blocks the flow path. It is characterized in that a bolt is inserted into a hole and a screw hole provided at a connection portion of the flow path, the mounting portion is sandwiched between the connection portion of the flow path, and the mounting portion is crushed in the thickness direction for mounting.

In the present invention, since the mounting portion is attached so as to block the flow path by the purification portion of the catalyst carrier at the connection portion of the flow path, the exhaust gas is not purified at the central portion of the exhaust flow path.

(A) is a vertical cross-sectional view showing the mounting structure of the catalyst carrier of the present invention, and (b) is a longitudinal sectional view showing the catalyst carrier. (A) to (f) are diagrams showing variations of the catalyst carrier used in the present invention, respectively. It is a figure for demonstrating the mounting situation of the conventional catalytic converter.

An object of the present invention is to efficiently purify the exhaust gas from the combustion chamber in the exhaust flow path immediately after the internal combustion engine. Then, in order to achieve this purpose, the catalyst carrier carrying the catalyst substance is used as an exhaust purification portion and an outer edge attachment portion, and a through hole provided in the attachment portion so that the purification portion blocks the flow path. This was achieved by inserting a bolt into a screw hole provided in the connecting portion of the flow path, sandwiching the mounting portion in the connecting portion of the flow path, and crushing the mounting portion in the thickness direction .

In the present invention, blocking the flow path means a state in which the fluid can flow in a state where the flow path exists in the flow path and the flow path is divided in terms of arrangement. That is, blocking the flow path divides the flow path and does not mean blocking the flow of the fluid. That is, since the inner peripheral portion of the tubular portion in Patent Document 1 communicates with the flow path, the tubular portion does not block the flow path.

In the present invention, as described above, the attachment portion is sandwiched between the connection portions of the flow path so that the purification portion blocks the flow path, but the fluid may leak from the connection portion depending on the catalyst carrier. is there.

Therefore, in the above configuration, the present invention adopts a configuration in which the mounting portion is crushed in the thickness direction and mounted, or the mounting portion is mounted with a connecting body interposed therebetween so that the fluid does not leak from the connecting portion of the flow path. do it. By doing so, the fluid (exhaust) does not leak from the connection portion, so that the exhaust purification efficiency by the catalyst is further improved.

The present invention assumes that, for example, a catalyst carrier is attached at a position relatively close to the combustion chamber of an internal combustion engine, for example, at a connection portion of a flow path between each combustion chamber and each branch pipe of the manifold. The catalyst carrier adopted in the mounting structure of the present invention preferably has the following configuration, for example.

The catalyst carrier has a structure in which a catalyst substance is supported on a porous body obtained by sintering, for example, a material obtained by laminating a plurality of wire meshes or a single layer wire mesh material, for example, a bent flow immediately after a combustion chamber. It is desirable because it is easy to install at the connection part such as the joint of the road.

Further, the catalyst carrier itself is not limited except that it has a purification portion and a mounting portion, and for example, the above-mentioned one-piece unit configuration is not limited, for example, with or without a gap between the purification portions in the flow path direction. The mounting portions may be stacked and used.

Further, the shape of the purified portion of the catalyst carrier is a planar shape, an uneven shape or a wave formed on the planar shape, or a weight shape in which the cross-sectional area decreases from the upstream to the downstream of the flow path. A shape that can secure a wide contact area with the exhaust gas, such as one that bulges from the upstream to the downstream of the flow path with a rectangular cross section or a circular cross section, may be used.

Further, when the catalyst carrier is attached to the connection portion of the flow path, the attachment portion which is the outer edge of the purification portion may be pressurized from the thickness direction to increase the density so that the exhaust gas does not leak from the connection portion. The front and back surfaces of the outer edge whose density has been increased by pressurization may be sandwiched between the connecting bodies.

Further, when the catalyst carrier is attached to the connection portion of the flow path, for example, a connection body may be provided on the attachment portion which is the outer edge of the purification portion so that exhaust gas does not leak from the connection portion, or the connection body may be provided. The outer edge (mounting portion) of the catalyst carrier may be fitted in the outer edge direction of the thick portion, or the connecting body may be composed of heat insulating fibers.

Hereinafter, specific examples of the mounting structure of the catalyst carrier of the present invention will be described with reference to FIGS. 1 and 2 . Reference numeral 1 denotes a catalyst carrier adopted in the present invention. In this example, the catalyst carrier 1 has a structure in which a catalyst substance is supported on a porous body obtained by sintering, for example, a material obtained by laminating a plurality of wire meshes or a single-layer wire mesh material (the drawing shows a single-layer material). (Shown) is adopted.

The outer edge of the purification portion 1A through which the exhaust gas passes is the mounting portion 1B of the catalyst carrier 1. The outer edge of the purification unit 1A means a portion located outside the exhaust flow path C.

Preparative with section 1B, in the present embodiment to increase the density is pressurized from the front and back in the thickness direction to the thickness center crush eye wire mesh (closing) that is, the catalyst carrier 1 when attached to the flow path, the Exhaust gas from the mounting portion 1B is prevented from leaking out of the flow path.

The catalyst carrier 1 is defined as a unit in which a catalyst substance is supported on a porous body obtained by sintering, for example, a material obtained by laminating a plurality of wire meshes or a single-layer wire mesh material. There are a plurality of configurations, for example, do not leave a space between the purification units 1A in the flow path direction as shown in FIG. 2 (a), or leave a space between the purification units 1A in the flow path direction as shown in FIG. 2 (b). It is also possible to open and use the mounting portions 1B on top of each other.

Furthermore, regarding the shape of the purifying portion 1A of catalyst carrier 1, but is a planar others, for example, the cross-sectional area toward the downstream from the flow path upstream as shown in FIG. 2 (c) is a smaller becomes conical As shown in FIG. 2 (d), unevenness and waves are formed in a planar shape, and as shown in FIGS. 2 (e) and 2 (f), the swelling into a circular or rectangular cross section from the upstream to the downstream of the flow path. It is also possible to use the one that was put out.

By using such a catalyst carrier 1, a wide contact area with the exhaust gas can be secured, so that the exhaust gas purification efficiency can be improved, the pressure loss can be reduced, and the material expands in the flow path direction due to heat. Since it absorbs mechanical dimensional fluctuations of shrinkage, it has the effect of stabilizing the mounting.

Further, the catalyst carrier 1, (closes) crushing the eye wire mesh in this embodiment to increase the density under pressure from the sides to the thickness center in advance from the thickness direction before attaching the connecting portion of the flow path in particular For the previously crushed eye wire mesh as a result of mounting sandwich the connection portion of the flow path may be either the mounting portion 1B is Ru collapsed in the thickness direction, of the.

In this example, the catalyst carrier 1 has a flow path from the exhaust hole A to the exhaust flow path C at the connection portion between the exhaust hole A of the cylinder head SH of the engine as an internal combustion engine and the exhaust flow path C of the manifold B. It is installed so as to block it.

Incidentally, the catalyst carrier 1 is described in what throughout this example is a circular planar, the shape is not limited constant but having purifier 1A and the attachment portion 1B as described above, the circle It may be an ellipse or a polygon. Further, for example, in a multi-cylinder manifold B, the catalyst carrier 1 may have a shape that follows the flange shape of the end surface on the SH side of the cylinder head, and the portion through which the exhaust gas flows is designated by the purification portion 1A as the outer edge (purification portion 1A). The shape is not limited as long as the enclosed portion) is the mounting portion 1B.

Media bearing member 1 catalyst, for example mutual butt flange portion SHa of cylinder head SH and the manifold B, and mounting portion 1B is located in Ba, flange SHa, the screw holes SHb formed Ba, Bb, respectively position At the same time, the bolt P is inserted, and the flange portions SHA and Ba are screwed together with the nut N via the bolt P and the spring washer SW for preventing the bolt P from loosening and attached.

Further, the mounting portion 1B and the connecting bodies 2A and 2B have a screw hole SHb formed in the flange SH of the cylinder head SH, and a screw hole Bb formed in the flange Ba of the manifold B at the same position as these screw holes SHb. Through holes 1Ba (mounting portion 1B) and 2a, 2a (connecting body 2A) of the bolt P are provided at the same positions where they communicate with each other.

Then, the catalyst carrier 1 is positioned at the connection portion between the cylinder head SH and the manifold B, and is provided in the screw hole SHb of the cylinder head SH, in the through holes 2a, 1Ba, 2a and in the flange portion Ba at the end of the manifold B. The provided screw holes Bb are matched, and the bolts P are inserted into the screw holes Bb, the through holes 2a, 1Ba, 2a and the screw holes SHb via the spring washer SW, and are screwed and attached.

That is, the catalyst carrier 1 is integrated by being sandwiched between the front and back surfaces of the mounting portion 1B whose density is increased by pressurizing from the thickness direction with the connecting bodies 2A and 2B similar to the shape of the mounting portion 1B. The connecting body 2 may be a gasket interposed in a flow path relatively close to the combustion chamber of the internal combustion engine, for example, a connection portion between the exhaust hole A formed in the cylinder head SH and the flow path of the exhaust flow path C of the manifold B. ..

As described above, in the mounting structure of the present invention, the purification portion 1A and the mounting portion 1B of the catalyst carrier 1 are not separate bodies, and the mounting portion 1B pressurizes from the thickness direction to increase the density. Even if it is attached as described above, the exhaust gas is prevented from leaking, and even if the catalyst carrier 1 vibrates due to the pulsation of the exhaust gas from the combustion chamber, only the catalyst carrier 1 falls out inside the exhaust flow path C. There is nothing to do.

Further, in the case of the mounting structure of the present invention, since the connecting bodies 2A and 2B sandwich the front and back surfaces of the mounting portion 1B of the catalyst carrier 1 in the exhaust flow direction, the prevention of exhaust gas leakage from the connecting portion is ensured.

The material and detailed configuration of the connecting body 2 depend on the mounting position of the catalyst carrier 1, but considering that the catalyst carrier 1 is provided at a position relatively close to the combustion chamber of the internal combustion engine, the temperature and pressure are high. A material such as a metal or a copper alloy that can withstand may be adopted.

Further , instead of increasing the density of the catalyst carrier 1 by pressurizing the mounting portion 1B from the thickness direction (the thickness and density of the purification portion 1A remain the same), the following connector 2C (not shown) ) May be provided.

Chi words, mounting structure using the connecting member 2C is that attached to in terms of integrated catalyst carrier 1 pressurizes the connection body 2C in the thickness direction if example embodiment.

The connecting body 2C is formed with a through hole 2a of a bolt P screwed into the screw hole SHb at the same position as the screw hole SHb provided in the cylinder head SH on the outer edge thereof .

Media bearing member 1 catalyst in this case, as shown in FIG. 1 if e example is positioned between the flange Ba flange SHb and manifold B of the cylinder head SH, inserting bolts P through the scan pulling washer SW Then, screw and attach.

If the mounting structure uses the connecting body 2C, the connecting body 2C and the mounting portion 1B are more firmly integrated in the catalyst carrier 1, and even when the catalyst carrier 1 vibrates due to the pulsation of the exhaust gas from the combustion chamber. It is possible to prevent only the catalyst carrier 1 from falling into the exhaust flow path C, and it is possible to reliably prevent the exhaust from leaking from the exhaust flow path C.

The mounting structure of the present invention, instead of the connecting part 2C provided in the mounting portion 1B in the catalyst carrier 1, the ash over the mounting portion 1B of carbon fibers, glass fibers, such as alumina fiber adiabatic filler or expanded graphite May be adopted.

In this case, if example embodiment, the flange portions abutting one another in the cylinder head SH and the manifold B SHa, to position the connection portion 2D catalyst carrier 1 Ba, tightened so as to approach the flange portion SHa, the Ba together with bolts P Do it by . In this way , the heat transfer from the combustion chamber to the catalyst carrier 1 can be blocked by the heat insulating structure of the connecting body 2D.

As described above, in the present invention, since the catalyst carrier 1 is planar and the planar catalyst carrier 1 is attached to the connection portion of the flow path, it can be located relatively close to the combustion chamber. Can be installed. When installed at a position close to the combustion chamber, the outer edge of the purification unit 1A in the catalyst carrier 1 is substantially the entire surface purification unit 1A as the attachment portion 1B, so that the purification unit 1A is caused by the vibration of the pulsation of the combustion chamber. Can be prevented from falling into the exhaust flow path C.

Further, since the present invention prevents exhaust gas from leaking from the attachment portion 1B when attached to the connection portion of the flow path, the catalyst carrier 1 can be attached to the connection portion of the flow path as if a gasket is interposed. , Workability at the time of installation is good. Further, when the catalyst carrier 1 is deteriorated due to use, it may be replaced with a new catalyst carrier 1, so that the workability at the time of replacement is extremely good.

Further, in implementing the mounting structure, the present invention has a high degree of freedom in the configuration of the mounting portion 1B and the connecting body 2 provided on the mounting portion 1B in advance in the catalyst carrier 1, and the configuration for integrating these. It can be made to absorb the expansion or contraction of the material due to heat, so that stable mounting strength can be secured, and further, it can be deformed in various ways, have functions, or have functions depending on the mounting position and application. It can be specialized.

1 Catalyst carrier 1A Purification unit 1B Mounting unit 2 Connection

Claims (2)

The catalyst carrier is used as a mounting portion for the exhaust gas purification portion and the outer edge, and bolts are provided in the through hole provided in the mounting portion and the screw hole provided in the connecting portion of the flow path so that the purification portion blocks the flow path. A mounting structure for a catalyst carrier, characterized in that the mounting portion is inserted, sandwiched between connecting portions of the flow path, and crushed in the thickness direction for mounting. The mounting structure for a catalyst carrier according to claim 1, wherein the catalyst carrier is mounted by interposing a connecting body in the mounting portion so that fluid does not leak from the connecting portion of the flow path.

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