JP7234649B2 - 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. According to Patent Document 1, a supercharger is attached to an outlet of an exhaust port provided in a cylinder head, and the supercharger is arranged above the upper end of the cylinder head.

JP 2016-125404 A

However, in the engine disclosed in Patent Document 1, since the supercharger is arranged above the upper end of the cylinder head, members such as the cylinder head, cylinder head cover, air cleaner, etc., which are arranged in the upper part of the engine, are arranged above the engine. may receive high temperature heat from the supercharger.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular internal combustion engine capable of protecting the members arranged in the upper part of the engine from the influence of the heat of the turbocharger. It is intended for

The present invention includes a cylinder head arranged on an upper part of an engine body, a cylinder head cover joined to the upper side of the cylinder head via a sealing surface, a collective exhaust outlet opening to one side surface of the cylinder head, and the collective a turbocharger having an exhaust passage portion extending upward from an exhaust outlet and disposed on the side of the sealing surface ; a catalyst case extending downward along the side surface of the engine body from the exhaust passage portion; a catalyst case cover formed in a shape open to the engine body side and covering the catalyst case from the side opposite to the engine body, wherein exhaust discharged from the collective exhaust outlet passes through the exhaust passage portion and the turbocharger; and the catalyst case, wherein an air cleaner is provided above the cylinder head cover and in the vicinity of the turbocharger, and is provided above the collective exhaust outlet and the turbocharger. A plate-shaped heat shield plate extending upward is provided between the feeder and the engine body, and the heat shield plate passes through the side of the seal surface and extends upward from the bottom of the air cleaner , The air cleaner has an upper air cleaner case, a lower air cleaner case arranged on the lower surface of the upper air cleaner case, and an air cleaner case sealing portion joining the upper air cleaner case and the lower air cleaner case, and the heat shield plate. The upper end of the extends above the air cleaner case seal portion .

Thus, according to the present invention, it is possible to protect the members arranged in the upper part of the engine from the influence of the heat of the turbocharger.

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 vehicle 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 joined to the upper side of the cylinder head via a sealing surface, and a cylinder head cover on one side surface of the cylinder head. A turbocharger having an open collective exhaust outlet and an exhaust passage portion extending upward from the collective exhaust outlet and disposed on the side of the seal face portion; and a turbocharger extending downward along the side surface of the engine body from the exhaust passage portion. Equipped with a catalyst case and a catalyst case cover formed in a shape open to the engine body side and covering the catalyst case from the side opposite to the engine body, and the exhaust discharged from the collective exhaust outlet passes through the exhaust passage portion and the turbo supercharger. and a catalyst case, wherein an air cleaner is provided above the cylinder head cover and in the vicinity of the turbocharger, and above the collective exhaust outlet and between the turbocharger and the engine body. A plate-shaped heat shield plate is provided between the two and extends upward, and the heat shield plate passes through the side of the sealing surface and extends upward from the bottom of the air cleaner. As a result, the vehicle internal combustion engine according to the embodiment of the present invention can protect the members arranged in the upper part of the engine from the influence of the heat of the turbocharger.

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 is attached to the flange portion 12A by fastening and has an exhaust passage portion 22A through which the exhaust gas is introduced from the collective exhaust outlet 17. As shown in FIG. 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 a turbo inlet pipe (not shown), and the intake air discharge portion 23B is connected to an air cleaner 28 via an air cleaner hose 23C.

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 introduced from the turbo inlet pipe into the compressor housing 23 is supercharged and introduced into the air cleaner 28 via the air cleaner hose 23C.

The air cleaner 28 filters the compressed air supercharged by the turbocharger 21 and introduces the filtered air into an intake manifold (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 is arranged on the upper side of the cylinder head 12 and is joined to the cylinder head 12 via a sealing surface 4B. 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-shaped heat shield plate 41 extending upward 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. , have The heat shield plate 41 is fixed to the cylinder head 12 by fastening at the lower extension portion 41C.

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 upward 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 by passing through the side of the seal surface 4</b>B 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 this gasket 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. 4, the cylinder head cover 13 has a bulging portion 13B between the ignition coil 43 and the turbocharger 21, which 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 by fastening.

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. The bracket 42 has a horizontal portion 42A fastened to the upper surface of the bulging portion 13B and a vertical portion 42B extending upward from the horizontal portion 42A and fastened to the upper end portion 41B of the heat shield plate 41 .

Instead of curving the upper end portion 41B of the heat shield plate 41, or in combination with the configuration in which the upper end portion 41B is curved, the heat shield plate 41 as a whole is arranged along a vertical line so as to extend upward and away from the engine body 4A. You may arrange|position in the attitude|position which inclines to the turbosupercharger 21 side with respect to.

As described above, according to the engine 4 of this embodiment, the air cleaner 28 is provided above the cylinder head cover 13 and in the vicinity of the turbocharger 21, and above the collective exhaust outlet 17 and between the turbocharger 21 and the engine. A plate-shaped heat shield plate 41 extending upward is provided between the main body 4A. The heat shield plate 41 extends above the bottom of the air cleaner 28 by passing through the side of the seal surface 4B that joins the cylinder head 12 and the cylinder head cover 13 together.

As a result, the heat shield plate 41 passes between the seal surface 4B and the turbocharger 21 and its upper end extends to the same height as the air cleaner 28, so that the cylinder head 12, the cylinder head cover 13, the seal surface 4B, It is possible to protect the members and parts arranged in the upper part of the engine 4 such as the air cleaner 28 and the air cleaner case seal portion 28</b>C from the influence of the heat of the turbocharger 21 .

Further, according to the engine 4 of this embodiment, the upper end portion 41B of the heat shield plate 41 is curved so as to extend in the direction away from the engine main body 4A.

Thus, by curving the upper end portion 41B of the heat shield plate 41, the hot air directed upward from the turbocharger 21 can be guided away from the engine main body 4A. Therefore, the members arranged in the upper part of the engine 4 can be protected from the influence of the heat of the turbocharger 21 .

Further, according to the engine 4 of this embodiment, 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, the upper air cleaner case 28A and the lower air cleaner case 28B. and an air cleaner case seal portion 28C to be joined. An upper end 41a of the heat shield plate 41 extends above the air cleaner case seal portion 28C.

Since the upper end 41a of the heat shield plate 41 extends above the air cleaner case seal portion 28C, the air cleaner case seal portion 28C can also be protected from the heat of the turbocharger 21. FIG.

Further, according to the engine 4 of this embodiment, a plurality of ignition coils 43 are provided on the upper surface of the cylinder head cover 13, and the cylinder head cover 13 has a bulging portion 13B that bulges upward from the upper end of the ignition coil 43. between the ignition coil 43 and the turbocharger 21 . The heat shield plate 41 is attached to the front surface 12a of the cylinder head 12 and the bulging portion 13B.

Here, the heat shield plate 41 is fixed to the engine body 4A at its lower lower extension portion 41C, and the upper end 41a of the heat shield plate 41 behaves as a free end with respect to vibration. In order to suppress the vibration of the heat shield plate 41, it is conceivable to shorten the length of the heat shield plate 41 in the vertical direction. , the position of the upper end 41a of the heat shield plate 41 is lowered, heat tends to flow around the heat shield plate 41, and the heat shield performance is lowered.

Therefore, by attaching the heat shield plate 41 to the cylinder head 12 located in the upper part of the engine body 4A as in this embodiment, the heat shield plate 41 can be supported at a higher position. Therefore, it is possible to extend the heat shield plate 41 upward while suppressing the vibration of the heat shield plate 41 . By doing so, members such as the ignition coil 43 arranged in the upper part of the engine 4 can be protected from the influence of the heat of the supercharger.

Further, according to the engine 4 of this embodiment, the 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 .

Thereby, the harness 44 can be protected from the influence of the heat of the turbocharger 21 .

Further, according to the engine 4 of this embodiment, the heat shield plate 41 is supported by the bulging portion 13B via the L-shaped bracket 42 .

As a result, the heat shield plate 41 can be connected to and supported by the bracket 42 at a higher position closer to the upper end 41a acting as a free end of the vibration, so that the vibration of the upper end 41a of the heat shield plate 41 can be suppressed by the bracket 42. be able to. Therefore, while preventing vibration of the heat shield plate 41, it is possible to prevent the heat of the turbocharger 21 from passing over the heat shield plate 41 and entering the engine main body 4A side.

In addition, in the engine 4 of this embodiment, the heat shield plate 41 is inclined toward the turbocharger 21 with respect to the vertical line so as to move away from the engine body 4A as it extends upward.

As a result, hot air directed upward from the turbocharger 21 can be guided away from the engine main body 4A. In addition, since the gap between the heat shield plate 41 and the engine main body 4A can be widened by tilting the heat shield plate 41, it is possible to make it difficult for the radiant heat emitted from the heat shield plate 41 itself to be transmitted to the engine main body 4A. . Therefore, the members arranged in the upper part of the engine 4 can be protected from the influence of the heat of the turbocharger 21 .

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.

DESCRIPTION OF SYMBOLS 1... Vehicle, 4... Engine (vehicle internal combustion engine), 4A... Engine main body, 4B... Seal surface, 12... Cylinder head, 12a... Front surface, 13... Cylinder Head cover 13B... Swelling part 17... Collective exhaust outlet 21... Turbocharger 22A... Exhaust passage part 25... Catalyst case 28... Air cleaner 28A. ..Upper air cleaner case 28B...Lower air cleaner case 28C...Air cleaner case seal portion 40...Catalyst case cover 41...Heat shield plate 41a...Upper end 42... Bracket, 43...Ignition coil, 44...Harness

Claims (6)

A cylinder head arranged in the upper part of the engine body,
a cylinder head cover 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 and disposed on the side of the sealing surface ;
a catalyst case extending downward along the side surface of the engine body from the exhaust passage;
a catalyst case cover formed in a shape open to the engine body side and covering the catalyst case from the side opposite to the engine body, wherein exhaust discharged from the collective exhaust outlet passes through the exhaust passage portion and the turbo filter; A vehicle internal combustion engine sequentially passing through a feeder and the catalyst case,
An air cleaner is provided above the cylinder head cover and near the turbocharger,
A plate-shaped heat shield plate extending upward is provided above the collective exhaust outlet and between the turbocharger and the engine body,
The heat shield plate passes through the side of the seal surface and extends upward from the bottom of the air cleaner ,
The air cleaner has an upper air cleaner case, a lower air cleaner case arranged on the lower surface of the upper air cleaner case, and an air cleaner case seal portion joining the upper air cleaner case and the lower air cleaner case,
An internal combustion engine for a vehicle , wherein an upper end of the heat shield plate extends above the air cleaner case seal portion . 2. The vehicle internal combustion engine according to claim 1, wherein an upper end of said heat shield plate is curved so as to extend in a direction away from said engine body. A plurality of ignition coils are provided on the upper surface of the cylinder head cover,
The cylinder head cover has a bulging portion that bulges above the upper end of the ignition coil between the ignition coil and the turbocharger,
3. The vehicle internal combustion engine according to claim 1 , wherein the heat shield plate is attached to the front surface of the cylinder head and the bulging portion . 4. The vehicle internal combustion engine according to claim 3, wherein a harness is connected to the ignition coil, and the harness extends in a direction opposite to the heat shield plate with respect to the ignition coil. 4. The vehicle internal combustion engine according to claim 3, wherein the heat shield plate is supported by the bulging portion via an L-shaped bracket. 4. The vehicle internal combustion engine according to claim 3, wherein the heat shield plate is inclined with respect to a vertical line so as to move away from the engine body as it extends upward.

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