JP7206945B2 - internal combustion engine for vehicle - Google Patents

Description

The present invention relates to a vehicle internal combustion engine.

2. Description of the Related Art Conventionally, as an internal combustion engine mounted on a vehicle, one described in Patent Document 1 is known. In Patent Document 1, an exhaust collecting pipe having one exhaust outlet is integrated with a cylinder head, a turbocharger turbine and an exhaust purification device are connected to the exhaust outlet, and the turbine is connected to the exhaust collecting pipe and the exhaust gas. It is placed above the purifier.

JP 2014-163291 A

However, in the device disclosed in Patent Document 1, when the turbine is arranged above the exhaust collecting pipe, the turbine and the exhaust purification device, which are heated to high temperatures, are in contact with the seal portion between the cylinder head and the cylinder head cover and the cylinder head cover. engine auxiliaries arranged above the engine, and these parts and auxiliaries may be exposed to high heat. In addition, when the catalyst case of the exhaust purification device is covered from the side opposite to the engine body by a catalyst case cover formed so that the engine body side is open, the hot air in the catalyst case cover tends to flow to the accessory side. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular internal combustion engine capable of protecting parts arranged in the upper part of the engine from hot air flowing out from the inside of a catalyst case cover. It is intended for

The present invention comprises a cylinder head arranged in the upper part of an engine body, a cylinder head cover hermetically joined to the upper side of the cylinder head via a sealing surface, a collective exhaust outlet opening on one side surface of the cylinder head, A turbocharger having an exhaust passage portion extending upward from the collective exhaust outlet, a catalyst case extending downward along the side surface of the engine body from the exhaust passage portion, and a shape open to the engine body side. and a catalyst case cover covering the catalyst case from the side opposite to the engine body, wherein the cylinder head has a flange projecting from the one side surface of the cylinder head and opening the collective exhaust outlet. The catalyst case is arranged laterally of the flange portion, the upper end portion of the catalyst case cover is arranged laterally of the cylinder head cover, and the catalyst case cover is positioned between the catalyst case cover and the engine body. A plate-shaped heat shield plate extending in the vertical direction is disposed, the upper end of the heat shield plate protrudes above the upper end of the catalyst case cover, and the heat shield plate extends from the upper side of the flange portion of the catalyst case. It has a main body portion extending to the back side, and a lower extension portion extending downward from the main body portion along the back side of the catalyst case .

As described above, according to the present invention, the parts arranged in the upper part of the engine can be protected from the hot air flowing out from the inside of the catalyst case cover.

FIG. 1 is a front view of a vehicle internal combustion engine according to one embodiment of the present invention. FIG. 2 is a front view of a vehicle internal combustion engine according to an embodiment of the present invention, showing a state in which a turbocharger, an exhaust purification device and an air cleaner are removed. FIG. 3 is a right side view of the vehicle internal combustion engine according to the embodiment of the present invention, with the air cleaner hose removed. FIG. 4 is a left side view of the vehicle internal combustion engine according to the embodiment of the present invention, with the air cleaner hose removed. FIG. 5 is a plan view of a vehicle internal combustion engine according to an embodiment of the present invention, with an air cleaner removed.

A vehicular internal combustion engine according to one embodiment of the present invention includes a cylinder head disposed on an upper portion of an engine body, a cylinder head cover hermetically joined to the upper side of the cylinder head via a sealing surface, and a portion of the cylinder head. A turbocharger having a collective exhaust outlet opening to the side, an exhaust passage extending upward from the collective exhaust outlet, a catalyst case extending downward along the side of the engine body from the exhaust passage, and open to the engine body side. an internal combustion engine for a vehicle comprising: a catalyst case cover formed in a shape that covers the catalyst case from the side opposite to the engine body, wherein the upper end portion of the catalyst case cover is arranged on the side of the cylinder head cover, and the catalyst case cover and the engine body, a vertically extending plate-shaped heat shield plate is disposed, and the upper end of the heat shield plate protrudes above the upper end of the catalyst case cover. As a result, the vehicle internal combustion engine according to the embodiment of the present invention can protect the parts arranged in the upper part of the engine from hot air flowing out from the inside of the catalyst case cover.

A vehicle internal combustion engine according to an embodiment of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams showing a vehicle internal combustion engine according to one embodiment of the present invention. 1 to 5, the vertical, front, rear, left, and right directions refer to the vertical, front, rear, left, and right directions of the vehicle internal combustion engine installed in the vehicle, and the horizontal direction and the height of the vehicle internal combustion engine are perpendicular to the front and rear directions. The direction is vertical.

First, the configuration will be explained. In FIG. 1, an engine 4 as a vehicle internal combustion engine is composed of an engine main body 4A and accessories described later. The engine body 4A includes a cylinder block 11, a cylinder head 12, a cylinder head cover 13, and an oil pan 14 in which lubricating oil is stored.

A plurality of cylinders (not shown) are provided in the cylinder block 11 . The engine 4 of this embodiment is a four-cylinder engine having four cylinders, but is not limited to a four-cylinder engine.

A piston (not shown) is accommodated in the cylinder, and the piston reciprocates vertically with respect to the cylinder. The pistons are connected to the crankshaft 11S (see FIG. 4) via connecting rods (not shown), and reciprocating motion of the pistons is converted to rotational motion of the crankshaft 11S via the connecting rods.

1 and 3, a chain case 7 is fastened to the right end portion of the cylinder block 11 in the direction of the row of cylinders.

Here, the cylinder row direction of the engine 4 is the left-right direction, that is, the vehicle width direction. Therefore, the engine 4 is arranged horizontally in a vehicle (not shown).

In FIG. 1, the cylinder head 12 is provided with a plurality of intake ports, a plurality of intake valves for opening and closing the intake ports, a plurality of exhaust ports, and a plurality of exhaust valves for opening and closing the exhaust ports.

An intake manifold (not shown) is provided on the rear surface of the cylinder head 12, and the intake manifold introduces intake air into the cylinder through an intake port.

An exhaust manifold 16 (see FIG. 2) is formed inside the cylinder head 12 . The exhaust manifold 16 has a plurality of exhaust ports (not shown) communicating with the cylinders, and collects exhaust gas (also called exhaust gas or exhaust gas) discharged from the cylinders. In other words, an exhaust manifold 16 integrated with the exhaust port is formed inside the cylinder head 12 . Note that FIG. 2 shows a portion after the exhaust manifold 16 is assembled.

In FIG. 2, exhaust manifold 16 has a collective exhaust outlet 17 . The collective exhaust outlet 17 opens in the front surface 12a of the cylinder head 12 at the central portion in the cylinder row direction.

Exhaust gas discharged from the cylinders is collected in an exhaust manifold 16 and then discharged to the outside of the cylinder head 12 through a collective exhaust outlet 17 .

A flange portion 12</b>A forming a mounting surface on which the turbocharger 21 is mounted is provided on the front surface 12 a of the cylinder head 12 around the collective exhaust outlet 17 .

In FIG. 1 , the turbocharger 21 is installed on the front surface 11 a side of the cylinder block 11 and has a turbine housing 22 and a compressor housing 23 . The turbine housing 22 has an exhaust passage portion 22A, which is attached to the flange portion 12A by fastening. Exhaust is introduced from the collective exhaust outlet 17 into the exhaust passage portion 22A. The exhaust passage portion 22A extends upward from the collective exhaust outlet 17. As shown in FIG.

A turbine wheel (not shown) is rotatably provided in the turbine housing 22, and the turbine wheel is rotationally driven by the exhaust introduced into the turbine housing 22 from the collective exhaust outlet 17 through the exhaust passage 22A.

The compressor housing 23 is provided with an intake air introduction portion 23A and an intake air discharge portion 23B. The intake air introduction portion 23A is connected to an air cleaner 28 via a turbo inlet pipe and an air cleaner hose 23C, and the intake air discharge portion 23B is connected to an intake manifold via an intercooler (not shown).

A compressor wheel (not shown) is rotatably provided in the compressor housing 23, and the compressor wheel rotates integrally with the turbine wheel.

In the turbocharger 21, when the turbine wheel is rotated by the exhaust flow, the compressor wheel is rotated together with the turbine wheel at high speed. When the compressor wheel rotates, the air purified by the air cleaner 28 is introduced into the compressor housing 23 through the air cleaner hose 23C and the turbo inlet pipe. The air introduced into the compressor housing 23 is supercharged and introduced into the intake manifold via an intercooler (not shown).

The turbine housing 22 is provided with an exhaust discharge section (not shown), and this exhaust discharge section is connected to an exhaust purification device 24 arranged on the right side thereof.

In FIG. 2 , the exhaust purification device 24 has a catalyst case 25 . The catalyst case 25 extends downward along the side surface of the engine body 4A from the exhaust passage portion 22A. The catalyst case 25 is composed of a body portion 25C, an upstream pipe portion 25A provided on the upstream side of the body portion 25C, and a downstream pipe portion 25B provided on the downstream side of the body portion 25C. The upstream pipe portion 25A connects the turbine housing 22 of the turbocharger 21 and the main body portion 25C. Here, upstream and downstream refer to upstream and downstream with respect to the flow direction of exhaust gas.

A main body portion 25C of the catalyst case 25 accommodates a three-way catalyst and a particulate filter (not shown). The three-way catalyst simultaneously purifies HC, CO, and NOx contained in exhaust gas through oxidation-reduction reactions.

The particulate filter is installed on the downstream side of the three-way catalyst, and PM (particulate matter), which is particulate matter in the exhaust, is composed of graphite, unburned fuel (SOF: combustible organic component), and engine oil. to collect ash (oil ash), etc.

An upstream end of the upstream pipe portion 25A opens toward the turbine housing 22 of the turbocharger 21 and is connected to the turbine housing 22 . As a result, the exhaust discharged from the collective exhaust outlet 17 to the turbine housing 22 is introduced from the turbine housing 22 through the upstream pipe portion 25A into the main body portion 25C, and in the process of passing through the inside of the main body portion 25C, the three-way catalyst and the Purified by a particulate filter.

The downstream pipe portion 25B is connected to an exhaust pipe (not shown), and the exhaust gas flowing through the main body portion 25C of the catalyst case 25 is discharged outside from the downstream pipe portion 25B through the exhaust pipe. A cylinder head cover 13 that is airtightly joined via a seal surface 4B is arranged above the cylinder head 12 . The collective exhaust outlet 17 opens on one side surface (front side surface) of the cylinder head 12 . A gasket or liquid gasket (not shown) is provided on the sealing surface 4B.

In FIG. 1, the engine 4 is provided with a catalyst case cover 40 that is open to the side of the engine body 4A and covers the catalyst case 25 from the side opposite to the engine body 4A. The upper end of the catalyst case cover 40 is arranged on the side of the cylinder head cover 13 .

1, 3, and 4, a plate-like heat shield plate 41 extending in the vertical direction is arranged between the catalyst case cover 40 and the engine body 4A. An upper end 41 a of the heat shield plate 41 protrudes above the upper end of the catalyst case cover 40 . 4, the heat shield plate 41 is supported by the cylinder head 12 and the cylinder head cover 13. As shown in FIG.

In FIG. 2, the cylinder head 12 has a flange portion 12A protruding from a front surface 12a as one side surface of the cylinder head 12 and having a collective exhaust outlet 17 open. The catalyst case 25 (see FIG. 1) is arranged on the side of the flange portion 12A.

The heat shield plate 41 includes a body portion 41A extending from the upper side of the flange portion 12A to the back side of the catalyst case 25 (see FIG. 1), and a lower extension portion 41C extending downward along the back side of the catalyst case 25 from the body portion 41A. , has

In FIG. 1, the catalyst case cover 40 has an opening 40B for introducing outside air. The opening 40B is arranged in front of the heat shield plate 41 in the catalyst case cover 40 . Specifically, the opening 40B is located in front of the lower extension 41C of the heat shield plate 41 .

In FIG. 1, an air cleaner 28 is provided above the cylinder head cover 13 and near the turbocharger 21 . A plate-shaped heat shield plate 41 extending in the vertical direction is provided above the collective exhaust outlet 17 and between the turbocharger 21 and the engine main body 4A. The heat shield plate 41 extends above the bottom of the air cleaner 28 through the side of the seal surface 4B that joins the cylinder head 12 and the cylinder head cover 13 .

3 and 4, the upper end portion 41B of the heat shield plate 41 is curved so as to extend away from the engine body 4A. Here, the upper end portion 41B of the heat shield plate 41 is a portion composed of the upper end 41a of the heat shield plate 41 and its vicinity.

In FIG. 1, the air cleaner 28 includes an upper air cleaner case 28A, a lower air cleaner case 28B arranged on the lower surface of the upper air cleaner case 28A, and an air cleaner case seal portion 28C joining the upper air cleaner case 28A and the lower air cleaner case 28B. ,have. An upper end 41a of the heat shield plate 41 extends above the air cleaner case seal portion 28C.

A gasket (not shown) is provided at the air cleaner case seal portion 28C, and the gasket airtightly joins the upper air cleaner case 28A and the lower air cleaner case 28B.

5, a plurality of ignition coils 43 are provided on the upper surface of the cylinder head cover 13. As shown in FIG. In FIG. 4, the cylinder head cover 13 has a bulging portion 13B between the ignition coil 43 and the turbocharger 21 that bulges above the upper end of the ignition coil 43 in FIG. The heat shield plate 41 is attached to the front surface 12a of the cylinder head 12 and the bulging portion 13B with fasteners.

A harness 44 is connected to the ignition coil 43 , and the harness 44 extends in the direction opposite to the heat shield plate 41 with respect to the ignition coil 43 . That is, when viewed from the ignition coil 43, the heat shield plate 41 is arranged in front of the engine main body 4A, and the harness 44 extends rearward of the engine main body 4A.

4 and 5, the heat shield plate 41 is supported by the bulging portion 13B via an L-shaped bracket 42. As shown in FIG.

As described above, according to the engine 4 of the present embodiment, the engine 4 is provided with the catalyst case cover 40 that is open to the engine main body 4A side and covers the catalyst case 25 from the side opposite to the engine main body 4A.

The upper end of the catalyst case cover 40 is arranged on the side of the cylinder head cover 13, and a plate-shaped heat shield plate 41 extending vertically is arranged between the catalyst case cover 40 and the engine body 4A. An upper end 41 a of the heat shield plate 41 protrudes above the upper end of the catalyst case cover 40 .

As a result, the heat shield plate 41 can prevent the hot air in the catalyst case cover 40 from flowing toward the sealing surface 4B and the parts arranged above the cylinder head cover 13, and the sealing member used for the sealing surface 4B and the cylinder head cover 13 can be prevented from flowing. Parts such as the ignition coil 43 arranged above can be protected from hot air.

As a result, the parts arranged in the upper part of the engine 4 can be protected from the hot air flowing out from the inside of the catalyst case cover 40 .

Further, according to the engine 4 of this embodiment, the heat shield plate 41 is supported by the cylinder head 12 and the cylinder head cover 13 .

As a result, the heat shield plate 41 can suppress vibration of the heat shield plate 41 while extending the upper end 41 a of the heat shield plate 41 to the side of the cylinder head cover 13 to widen the heat shield range.

Further, according to the engine 4 of this embodiment, the cylinder head 12 has the flange portion 12A that protrudes from one side surface of the cylinder head 12 and the collective exhaust outlet 17 opens. placed on the side.

The heat shield plate 41 has a body portion 41A extending from the upper side of the flange portion 12A to the back side of the catalyst case 25, and a lower extension portion 41C extending downward along the back side of the catalyst case 25 from the body portion 41A. .

As a result, the heat shield plate 41 has a body portion 41A extending to the back side of the catalyst case 25 and a lower extension portion 41C extending downward along the back side of the catalyst case 25 from the body portion 41A. The inlet portion of the catalyst case 25, which becomes hotter, is covered with the body portion 41A and the lower extension portion 41C of the heat shield plate 41, thereby preventing hot air in the catalyst case 25 from flowing to the upper portion of the engine body 4A.

Further, according to the engine 4 of this embodiment, the catalyst case cover 40 has the opening 40B for introducing outside air, and the opening 40B is arranged in front of the heat shield plate 41 in the catalyst case cover 40. ing.

As a result, outside air can be introduced into the catalyst case cover 40 through the opening 40B to cool the upstream portion of the catalyst case 25 . Also, the heat shield plate 41 can prevent the outside air that has cooled the catalyst case 25 from flowing to the upper part of the engine.

Although embodiments of the present invention have been disclosed, it will be apparent that modifications may be made by those skilled in the art without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

4... Engine (vehicle internal combustion engine), 4A... Engine body, 4B... Seal surface, 12... Cylinder head, 12A... Flange, 13... Cylinder head cover, 17.. Collective exhaust outlet 21...Turbocharger 22A...Exhaust passage 25...Catalyst case 40...Catalyst case cover 40B...Opening 41...Heat shield Plate 41A... Main body part 41B... Upper end part 41C... Lower extension part 41a... Upper end

Claims (2)

A cylinder head arranged in the upper part of the engine body,
a cylinder head cover that is airtightly joined to the upper side of the cylinder head via a sealing surface;
a collective exhaust outlet opening on one side surface of the cylinder head;
a turbocharger having an exhaust passage extending upward from the collective exhaust outlet;
a catalyst case extending downward along the side surface of the engine body from the exhaust passage;
A vehicular internal combustion engine comprising: a catalyst case cover formed in a shape open to the engine body side and covering the catalyst case from a side opposite to the engine body,
The cylinder head has a flange portion protruding from the one side surface of the cylinder head and opening the collective exhaust outlet,
The catalyst case is arranged on the side of the flange,
an upper end portion of the catalyst case cover is disposed laterally of the cylinder head cover;
A plate-shaped heat shield plate extending in a vertical direction is arranged between the catalyst case cover and the engine body,
the upper end of the heat shield plate protrudes above the upper end of the catalyst case cover ;
The heat shield plate has a body portion extending from the upper side of the flange portion to the back side of the catalyst case, and a lower extension portion extending downward from the body portion along the back side of the catalyst case. and a vehicle internal combustion engine. The catalyst case cover has an opening for introducing outside air,
2. The vehicle internal combustion engine according to claim 1 , wherein the opening is located in front of the heat shield plate in the catalyst case cover .

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