JP2021011822A - Vehicular engine - Google Patents

Abstract

To provide a vehicular engine capable of securing mounting rigidity of an EGR valve without increasing weight of the engine even when the EGR valve is disposed at a position separated from a side surface of a cylinder head.SOLUTION: An EGR passage part 62 includes: an upstream side EGR passage part 63 connected to a lower surface of a cooling water passage part 61 and forming an EGR passage 62A to extend to a direction intersecting with the cooling water passage part 61; and a downstream side EGR passage part 64 connected to a side surface of the cooling water passage part 61 and forming the EGR passage to extend to an upper direction intersecting with the cooling water passage part 61. In an EGR valve mounting flange part 65, an end part of a mounting surface to which an EGR valve 47 is mounted extends to a position above the cooling water passage part 61. A housing 60 includes a rib 66 vertically extending on a flat surface intersecting with the cooling water passage part 61 and connecting the EGR valve mounting flange part 65 with an upper surface of the cooling water passage part 61.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle engine.

Conventionally, as a vehicle engine, the one described in Patent Document 1 is known. The vehicle engine described in Patent Document 1 includes an EGR device that introduces a part of exhaust gas into an intake manifold, forms a part of an EGR passage in a thermostat case arranged on a cylinder head, and forms a part of the EGR passage of the thermostat. The rise in the intake air temperature is suppressed by cooling the exhaust gas with the cooling water flowing through the case.

Japanese Unexamined Patent Publication No. 2001-2000762

However, in the one described in Patent Document 1, the amount of exhaust gas introduced into the intake manifold is adjusted by the EGR valve. This EGR valve may need to be located away from the side surface of the cylinder head to avoid interference with other components mounted on the side surface of the cylinder head. Further, since the EGR valve is a heavy object and is greatly affected by vibration from the engine when it is arranged at a position away from the side surface of the cylinder head, it is necessary to secure the rigidity of the mounting portion of the EGR valve. In order to secure the rigidity, it is conceivable to newly provide a reinforcing member or the like, but in that case, the weight of the engine may increase.

The present invention has been made by paying attention to the above circumstances, and even when the EGR valve is arranged at a position away from the side surface of the cylinder head, the EGR valve of the EGR valve does not increase the weight of the engine. It is an object of the present invention to provide a vehicle engine capable of ensuring mounting rigidity.

The present invention has a tubular cooling water passage portion that forms a cooling water passage that communicates with a cylinder head arranged at the upper part of the engine body, and an EGR passage portion that forms an EGR passage through which exhaust gas passes. A vehicle engine including a housing connected to a side surface of the cylinder head and an EGR valve provided in the housing and adjusting the amount of the exhaust gas passing through the EGR passage, wherein the cylinder in the housing. One end of the cooling water passage opens at the first end connected to the side surface of the head, and the other end of the cooling water passage opens at the second end of the housing facing the first end. The EGR passage portion is connected to the lower surface of the cooling water passage portion at a position away from the first end portion toward the second end portion, and extends in a direction intersecting the cooling water passage portion. The upstream EGR passage portion forming the EGR passage and the upstream EGR passage portion connected to the side surface of the cooling water passage portion at a position away from the first end portion toward the second end portion side. Has a downstream EGR passage portion that communicates with the downstream end portion of the EGR passage and forms the EGR passage so as to intersect the cooling water passage portion in the upward direction, and the upper end of the downstream EGR passage portion is the above. An EGR valve mounting flange portion that extends upward from the upper end of the cylinder head and mounts the EGR valve is formed at the upper end of the downstream EGR passage portion, and the EGR valve mounting flange portion is a mounting surface on which the EGR valve is mounted. The end extends above the cooling water passage portion, the housing extends vertically along a plane intersecting the cooling water passage portion, and the EGR valve mounting flange portion and the cooling water passage portion. It is characterized by having a rib connecting the upper surface.

As described above, according to the present invention, even when the EGR valve is arranged at a position away from the side surface of the cylinder head, the vehicle engine capable of ensuring the mounting rigidity of the EGR valve without increasing the weight of the engine. Can be provided.

FIG. 1 is a plan view of a vehicle engine according to an embodiment of the present invention. FIG. 2 is a front view of the upper part of the vehicle engine according to the embodiment of the present invention. FIG. 3 is a left side view of a vehicle engine according to an embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. FIG. 5 is a left side view of the housing of the vehicle engine according to the embodiment of the present invention. FIG. 6 is a sectional view taken along line in the VI-VI direction of FIG. FIG. 7 is a plan view of the housing of the vehicle engine according to the embodiment of the present invention. FIG. 8 is a rear view of the housing of the vehicle engine according to the embodiment of the present invention. FIG. 9 is a right side view of the housing of the vehicle engine according to the embodiment of the present invention. FIG. 10 is a perspective view of a vehicle engine housing according to an embodiment of the present invention.

The vehicle engine according to the embodiment of the present invention has a tubular cooling water passage portion forming a cooling water passage communicating with a cylinder head arranged in the upper part of the engine body and an EGR passage through which exhaust gas passes. A vehicle engine having an EGR passage portion to be formed, a housing connected to a side surface of a cylinder head, and an EGR valve provided in the housing and adjusting the amount of exhaust gas passing through the EGR passage. , One end of the cooling water passage opens at the first end connected to the side surface of the cylinder head in the housing, and the other end of the cooling water passage opens at the second end facing the first end of the housing. Then, the EGR passage portion is connected to the lower surface of the cooling water passage portion at a position away from the first end portion toward the second end portion, and forms an EGR passage portion so as to extend in a direction intersecting the cooling water passage portion. It is connected to the side surface of the cooling water passage at a position away from the first end to the second end, and communicates with the downstream end of the upstream EGR passage for cooling. It has a downstream EGR passage portion that forms an EGR passage so as to intersect the water passage portion and extends upward, and the upper end of the downstream EGR passage portion extends upward from the upper end of the cylinder head and the downstream EGR passage portion. An EGR valve mounting flange portion for mounting the EGR valve is formed at the upper end of the portion, and the end portion of the mounting surface on which the EGR valve is mounted extends to a position above the cooling water passage portion in the EGR valve mounting flange portion. It is characterized by having a rib extending in the vertical direction along a plane intersecting the cooling water passage portion and connecting the EGR valve mounting flange portion and the upper surface of the cooling water passage portion. Thereby, in the vehicle engine according to the embodiment of the present invention, even when the EGR valve is arranged at a position away from the side surface of the cylinder head, the mounting rigidity of the EGR valve is not increased without increasing the weight of the engine. Can be secured.

Hereinafter, a vehicle engine according to an embodiment of the present invention will be described with reference to the drawings. 1 to 10 are diagrams showing a vehicle engine according to an embodiment of the present invention. In FIGS. 1 to 10, the up / down / front / rear / left / right directions are the up / down / front / rear / left / right directions of the vehicle engine installed in the vehicle, the direction orthogonal to the front / rear direction is the left / right direction, and the height direction of the vehicle engine is. It is in the vertical direction.

First, the configuration will be described. In FIGS. 1 and 10, the vehicle engine 1 is composed of an engine body 10 and various auxiliary machines and parts mounted on the engine body 10. The engine body 10 includes a cylinder head 12, a cylinder head cover 13, and a cylinder block 11 (see FIG. 10). Further, the engine body 10 is provided with an oil pan (not shown) in which lubricating oil is stored.

The cylinder block 11 is provided with a plurality of cylinders (not shown). A plurality of cylinders are arranged side by side in the left-right direction. The vehicle engine 1 of the present embodiment is composed of a 4-cylinder engine having four cylinders, but is not limited to the four-cylinder engine.

A piston (not shown) is housed in the cylinder, and the piston reciprocates in the vertical direction with respect to the cylinder. The piston is connected to a crankshaft (not shown) via a connecting rod (not shown), and the reciprocating motion of the piston is converted into a rotational motion of the crankshaft via the connecting rod.

In FIG. 2, a chain case 15 is fastened to the right end of the cylinder head 12 in the cylinder row direction. The chain case 15 covers a timing chain (not shown) arranged on the cylinder head 12 and the cylinder block 11 (see FIG. 10).

Here, the cylinder row direction of the vehicle engine 1 is the left-right direction, that is, the vehicle width direction. Therefore, the vehicle engine 1 is arranged in a so-called transverse position in a vehicle (not shown).

In FIGS. 1 to 4, an air cleaner inlet pipe 21, a resonator 22, an air cleaner 23, and an air cleaner outlet pipe 24 are provided above the engine body 10. The air cleaner inlet pipe 21 is arranged above the central portion in the left-right direction of the engine body 10, and is curved so as to face rearward and then left frontward. The air cleaner inlet pipe 21 is connected to the air cleaner 23, and supplies the air taken in from the front to the air cleaner 23. The resonator 22 is arranged behind the air cleaner inlet pipe 21 and is connected in the middle of the air cleaner inlet pipe 21. The resonator 22 cancels the noise generated when air passes through the air cleaner inlet pipe 21 by the air column resonance action. The air cleaner 23 is arranged so as to protrude from the upper side of the left side portion of the engine body 10 to the left side. The air cleaner 23 filters air by an air cleaner element (not shown) provided inside the air cleaner 23. The air cleaner outlet pipe 24 is connected to the left end portion of the air cleaner 23 and the throttle body 25 described later, and supplies the air filtered by the air cleaner 23 to the throttle body 25.

In FIGS. 1 and 3, the vehicle engine 1 has a throttle body 25, and the throttle body 25 adjusts the amount of air flowing into the intake manifold 26. The throttle body 25 is arranged behind the air cleaner 23.

In FIGS. 1 and 3, an intake manifold 26 is provided on the rear surface of the cylinder head 12, and the intake manifold 26 introduces intake air into each cylinder through each intake port (not shown) formed on the cylinder head 12. ..

An exhaust manifold (not shown) is formed inside the cylinder head 12. The exhaust manifold has a plurality of exhaust ports (not shown) that communicate with each cylinder, and collects exhaust gas (also referred to as exhaust gas or exhaust gas) discharged from the cylinders. That is, an exhaust manifold integrated with the exhaust port is formed inside the cylinder head 12. The exhaust manifold has a common collective exhaust outlet (not shown). The collective exhaust outlet opens in front of the cylinder head 12 at the center in the cylinder row direction. The exhaust gas discharged from the cylinder is collected by the exhaust manifold and then discharged to the outside of the cylinder head 12 from the collecting exhaust outlet.

In FIGS. 1, 2, and 3, an exhaust gas purification device 31 is arranged on the front surface side of the cylinder head 12, and the exhaust gas purification device 31 extends downward along the front surface of the engine body 10. A three-way catalyst and a particulate filter (not shown) are housed inside the exhaust gas purification device 31. The three-way catalyst simultaneously purifies HC, CO, and NOx contained in the exhaust gas by a redox reaction.

The particulate filter is installed on the downstream side of the three-way catalyst, and as PM (particulate matter), which is a particulate matter in the exhaust, graphite, unburned fuel (SOF: flammable organic component), and engine oil. Collects the burning slag (oil ash) of.

An exhaust pipe (not shown) is connected to the lower end of the exhaust purification device 31. The exhaust gas that has passed through the exhaust purification device 31 and is purified is discharged to the outside of the vehicle through the exhaust pipe.

In FIGS. 1 and 7, the vehicle engine 1 includes an EGR upstream pipe 41 and an EGR downstream pipe 42. The EGR upstream pipe 41 is connected to the lower end of the exhaust gas purification device 31 and the housing 60 (see FIG. 7) described later. The EGR downstream pipe 42 is connected to the housing 60 and the intake path. The EGR upstream pipe 41 and the EGR downstream pipe 42 return a part of the exhaust gas that has passed through the exhaust purification device 31 to the intake path. The exhaust gas passing through the EGR upstream pipe 41 and the EGR downstream pipe 42 is cooled by heat exchange with the cooling water flowing through the housing 60. An EGR cooler 43 is provided in the middle of the EGR upstream pipe 41, and the EGR cooler 43 cools the exhaust gas by heat exchange with the cooling water.

In FIGS. 1, 2, and 3, the air cleaner 23 is arranged so as to extend from a position above the engine body 10 to a position above the housing 60. The vehicle engine 1 includes brackets 51 and 52 (see FIG. 4) that support the air cleaner 23 on the housing 60. The bracket 51 is made of a plate-shaped metal or the like bent in a Z shape, and is fixed to the air cleaner 23 and the housing 60. The bracket 51 is made of metal or the like having an L-shaped cross section bent in an arc shape, and is fixed to the air cleaner 23 and the cylinder head 12. A leg portion 23a projecting downward is provided in the lower portion of the air cleaner 23, and the leg portion 23a is fixed to the upper surface of the cylinder head cover 13. As described above, the air cleaner 23 is supported by the engine body 10 by the legs 23a and the brackets 51 and 52.

In FIGS. 2, 3, 4, 5, and 10, the vehicle engine 1 has a housing 60, which is connected to the left side surface 12A of the cylinder head 12. A thermostat 46 for adjusting the flow rate of cooling water is housed inside the housing 60. In this embodiment, the side surface 12A of the cylinder head 12 is the surface of the end portion on the transmission side in the cylinder row direction, which is not shown, among the four side surfaces of the cylinder head 12, but may be another side surface.

In FIG. 10, the housing 60 has a tubular cooling water passage portion 61 forming a cooling water passage 61A, and the cooling water passage portion 61 is a cylinder head 12 arranged in an upper portion of the engine main body 10. I'm communicating. Further, the housing 60 has an EGR passage portion 62 that forms an EGR passage 62A through which the exhaust gas passes. An EGR valve 47 for adjusting the amount of exhaust gas passing through the EGR passage 62A is provided in the upper part of the housing 60.

In FIG. 4, the housing 60 includes a first end portion 60A (right end portion) connected to the side surface 12A of the cylinder head 12 and a second end portion 60B (left end portion) facing the first end portion 60A. have.

One end (right end) of the cooling water passage 61A (see FIG. 5) is opened at the first end 60A, and the other end (left end) of the cooling water passage 61A is opened at the second end 60B. In FIG. 3, a cylindrical cap 45 is fixed to the second end 60B by bolts 50D and 50E.

In FIGS. 5, 6 and 9, a plurality of boss portions 67A, 67B and 67C to be fastened to the cylinder head 12 are formed on the outer peripheral portion of the cooling water passage portion 61. The boss portion 67A is arranged above the center of the cooling water passage 61A. The boss portions 67B and 67C are arranged below the center of the cooling water passage 61A. The boss portions 67A, 67B, and 67C form a first boss portion, a second boss portion, and a third boss portion in the present invention. As shown in FIG. 3, bolts 50A, 50B and 50C are fastened to the boss portions 67A, 67B and 67C. Further, in FIG. 3, the cap 45 is fastened to the housing 60 by bolts 50D and 50E.

In FIG. 6, the boss portion 67A is arranged between the EGR valve mounting flange portion 65 and the upper surface of the cooling water passage portion 61. The boss portion 67B is arranged above the upstream EGR passage portion 63. The boss portion 67C is arranged at an edge portion opposite to the cooling water passage 61A with respect to the downstream EGR passage portion 64. Further, the virtual line L connecting the center of the boss portion 67A and the center of the second boss portion 67B passes through the central portion of the EGR valve mounting flange portion 65.

In FIGS. 5, 6 and 10, the EGR passage portion 62 has an upstream side EGR passage portion 63 and a downstream side EGR passage portion 64. The upstream EGR passage portion 63 is connected to the lower surface of the cooling water passage portion 61 at a position separated from the first end portion 60A toward the second end portion 60B, and is connected to the lower surface of the cooling water passage portion 61 in a direction intersecting with the cooling water passage portion 61. The EGR passage 62A is formed so as to extend in the front-rear direction). The downstream EGR passage portion 64 is connected to the rear side surface of the cooling water passage portion 61 at a position separated from the first end portion 60A toward the second end portion 60B side, and is connected to the rear side surface of the upstream side EGR passage portion 63. The EGR passage 62A is formed so as to communicate with the downstream end portion and extend upward so as to intersect the cooling water passage portion 61.

Here, the EGR passage 62A inside the upstream EGR passage portion 63 and the downstream EGR passage portion 64 is formed in a circular cross section. The upstream EGR passage portion 63 and the downstream EGR passage portion 64 are formed in a tubular shape so as to surround the EGR passage 62A having a circular cross section.

In FIG. 5, the upper end 64B of the downstream EGR passage portion 64 extends upward from the upper end 12B of the cylinder head 12. An EGR valve mounting flange portion 65 for mounting the EGR valve 47 is formed at the upper end 64B of the downstream side EGR passage portion 64. In FIG. 9, the bracket 51 is fixed to the second fastening portion 65B, which is a part of the EGR valve mounting flange portion 65.

In FIG. 4, the EGR passage portion 62 is arranged in the housing 60 so as to be closer to the second end portion 60B than to the first end portion 60A.

In FIG. 6, the EGR valve mounting flange portion 65 has a first fastening portion 65A and a second fastening portion 65B. The first fastening portion 65A and the second fastening portion 65B are arranged on opposite sides to the center 64C of the downstream EGR passage portion 64. The center 64C of the downstream EGR passage portion 64 and the center 63C of the upstream EGR passage portion 63 intersect at right angles.

In FIGS. 5 and 10, the housing 60 has a flat rib 66, and the rib 66 extends in the vertical direction on a plane intersecting the cooling water passage portion 61. The rib 66 connects the EGR valve mounting flange portion 65 and the upper surface of the cooling water passage portion 61.

In FIG. 9, the lower portion of one of the first fastening portion 65A and the second fastening portion 65B (the first fastening portion 65A in this embodiment) is connected to the upper surface of the cooling water passage portion 61 by a rib 66 extending in the vertical direction. ing. A bracket 51 is attached to the upper part of the other (second fastening portion 65B in this embodiment) of the first fastening portion 65A and the second fastening portion 65B.

In FIGS. 6 and 9, the EGR valve mounting flange portion 65 has a mounting surface 65C on which the EGR valve 47 is mounted, and the end portion of the mounting surface 65C on the first fastening portion 65A side is a cooling water passage portion 61. It extends to a position above.

In FIGS. 6 and 9, the inner wall surface of the cooling water passage portion 61 is provided with two protrusions 61B that project into the cooling water passage 61A and position the thermostat 46. The protrusion 61B is arranged at a portion adjacent to the rib 66 and the downstream EGR passage portion 64 in the circumferential direction on the inner wall surface of the cooling water passage portion 61.

In FIGS. 5, 6 and 10, the upstream EGR passage portion 63 has an upstream flange portion 68 to which the EGR upstream pipe 41 for taking in exhaust gas is fastened. The upstream flange portion 68 is arranged on the side opposite to the downstream EGR passage portion 64 with respect to the cooling water passage 61A, and is connected to a lateral position of the cooling water passage 61.

In FIGS. 5 and 8, the downstream EGR passage portion 64 has a downstream flange portion 69 to which the EGR downstream pipe 42 (see FIG. 8) for discharging the exhaust gas is fastened. The mounting surface of the downstream flange portion 69 is arranged on the same plane as the plane along the second end portion 60B. The fastening portion 69A of the downstream flange portion 69 is arranged below the EGR valve mounting flange portion 65 and above the cooling water passage portion 61.

In FIG. 10, a cam angle sensor 53 is provided on the left side surface 12A of the cylinder head 12, and the cam angle sensor 53 detects the rotation angle of a camshaft (not shown) provided inside the cylinder head 12. ..

Here, since the cam angle sensor 53 needs to be arranged at a position corresponding to the cam shaft, it is difficult to freely select the installation position. Therefore, in this embodiment, the housing 60 and the EGR valve 47 are arranged so that the position does not interfere with the cam angle sensor 53. Specifically, the housing 60 is arranged so that the cam angle sensor 53 is located at the upper part on the front side of the housing 60. This prevents the cam angle sensor 53 from interfering with the housing. Further, by arranging the EGR valve 47 on the upper part on the rear side of the housing 60, it is possible to prevent the cam angle sensor 53 and the EGR valve 47 from interfering with each other. Further, by arranging the rib 66 at the position on the left side of the cam angle sensor 53, the cam angle sensor 53 is protected from collision with foreign matter or the like.

As described above, in the vehicle engine 1 of the present embodiment, the EGR passage portion 62 is connected to the lower surface of the cooling water passage portion 61 at a position separated from the first end portion 60A toward the second end portion 60B. The cooling water is separated from the upstream EGR passage 63, which forms the EGR passage 62A so as to extend in the direction intersecting the cooling water passage 61, from the first end 60A to the second end 60B. A downstream EGR passage 64 that is connected to the side surface of the passage 61, communicates with the downstream end of the upstream EGR passage 63, and forms an EGR passage 62A so as to intersect the cooling water passage 61 and extend upward. And have.

Therefore, both the upstream side EGR passage portion 63 and the downstream side EGR passage portion 64 connected to the lower surface and the side surface of the cooling water passage portion 61 can function as reinforcing members for improving the rigidity of the cooling water passage portion 61. .. Therefore, the rigidity of the cooling water passage portion 61 of the housing 60 can be improved without newly providing a separate reinforcing member.

Further, in the EGR valve mounting flange portion 65, the end of the mounting surface on which the EGR valve 47 is mounted extends to a position above the cooling water passage portion 61, and the housing 60 has a flat surface intersecting the cooling water passage portion 61. It has a rib 66 that extends in the vertical direction and connects the EGR valve mounting flange portion 65 and the upper surface of the cooling water passage portion 61.

Therefore, the cooling water passage portion 61 with improved rigidity and the EGR valve mounting flange portion 65 are connected by the rib 66, and the mounting rigidity of the EGR valve 47 can be improved. Further, by forming the rib 66 in a shape extending in the vertical direction on a plane intersecting the cooling water passage portion 61, even when the size and the wall thickness of the rib 66 are made the minimum necessary shape, the rib 66 is used. Since the load acting in the plane direction can be effectively received, the weight increase due to the provision of the rib 66 can be suppressed.

As a result, even when the EGR valve 47 is arranged at a position away from the side surface of the cylinder head 12, the mounting rigidity of the EGR valve 47 can be ensured without increasing the weight of the vehicle engine 1.

Further, in the vehicle engine 1 of the present embodiment, the upstream side EGR passage portion 63 has an upstream side flange portion 68 to which a pipe for taking in exhaust gas is fastened, and the upstream side flange portion 68 is a cooling water passage 61A. It is arranged on the opposite side of the downstream side EGR passage portion 64 and is connected to the side position of the cooling water passage portion 61.

As a result, the highly rigid upstream flange portion 68 is connected to the side position of the cooling water passage portion 61, and the upstream EGR passage portion 63 and the downstream EGR passage so as to surround the cooling water passage portion 61. By arranging the portion 64, the rigidity of the cooling water passage portion 61 can be further improved, and the mounting rigidity of the EGR valve 47 with respect to the EGR passage portion 62 can be further improved.

In the vehicle engine 1 of the present embodiment, the downstream EGR passage portion 64 has a downstream flange portion 69 to which a pipe for discharging exhaust gas is fastened, and the mounting surface of the downstream flange portion 69 is a second. It is arranged on the same surface as the plane along the end portion 60B, and the fastening portion 69A of the downstream side flange portion 69 is arranged below the EGR valve mounting flange portion 65 and above the cooling water passage portion 61.

Therefore, by providing the downstream flange portion 69 in the downstream EGR passage portion 64 that supports the EGR valve 47 in the EGR valve mounting flange 65 portion, the support rigidity of the EGR valve 47 by the downstream EGR passage portion 64 is improved. Can be made to.

Further, since the fastening portion 69A of the downstream flange portion 69 is arranged below the EGR valve mounting flange portion 65 and above the cooling water passage portion 61, the rigidity of the rib 66 can be improved. ..

Although the embodiments of the present invention have been disclosed, it is clear that some skilled in the art can make changes without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1 ... Vehicle engine, 10 ... Engine body, 12 ... Cylinder head, 12A ... Side, 12B ... Upper end, 41 ... EGR upstream piping, 42 ... EGR downstream piping, 47 ... EGR valve, 60 ... housing, 60A ... first end, 60B ... second end, 61 ... cooling water passage, 61A ... cooling water passage, 62 ... EGR passage, 62A ... EGR passage, 63 ... upstream EGR passage, 64 ... downstream EGR passage, 64B ... upper end, 65 ... EGR valve mounting flange , 65C ... mounting surface, 66 ... ribs, 68 ... upstream flange, 69 ... downstream flange, 69A ... fastening

Claims (3)

The cylinder head has a tubular cooling water passage portion that forms a cooling water passage communicating with a cylinder head arranged on the upper part of the engine body, and an EGR passage portion that forms an EGR passage through which exhaust gas passes. The housing connected to the side and
A vehicle engine provided in the housing and comprising an EGR valve for adjusting the amount of the exhaust gas passing through the EGR passage.
One end of the cooling water passage is opened at a first end connected to the side surface of the cylinder head in the housing.
The other end of the cooling water passage is opened at the second end of the housing facing the first end.
The EGR passage portion is
An upstream that is connected to the lower surface of the cooling water passage portion at a position away from the first end portion toward the second end portion and forms the EGR passage so as to extend in a direction intersecting the cooling water passage portion. Side EGR passage and
The cooling water passage portion is connected to the side surface of the cooling water passage portion at a position away from the first end portion toward the second end side, communicates with the downstream end portion of the upstream EGR passage portion, and is connected to the downstream end portion of the cooling water passage portion. It has a downstream EGR passage portion forming the EGR passage so as to extend upward so as to intersect with the EGR passage portion.
The upper end of the downstream EGR passage portion extends upward from the upper end of the cylinder head.
An EGR valve mounting flange portion for mounting the EGR valve is formed at the upper end of the downstream EGR passage portion.
In the EGR valve mounting flange portion, the end portion of the mounting surface on which the EGR valve is mounted extends to a position above the cooling water passage portion.
The housing is a vehicle engine characterized in that it extends in a vertical direction along a plane intersecting the cooling water passage portion and has a rib connecting the EGR valve mounting flange portion and the upper surface of the cooling water passage portion. .. The upstream EGR passage portion has an upstream flange portion to which a pipe for taking in the exhaust gas is fastened.
The claim is characterized in that the upstream flange portion is arranged on the side opposite to the downstream EGR passage portion with respect to the cooling water passage, and is connected to a lateral position of the cooling water passage portion. Item 1. The vehicle engine according to item 1. The downstream EGR passage portion has a downstream flange portion to which a pipe for discharging the exhaust gas is fastened.
The mounting surface of the downstream flange portion is arranged on the same plane as the plane along the second end portion.
The first or second aspect of the present invention, wherein the fastening portion of the downstream flange portion is arranged below the EGR valve mounting flange portion and above the cooling water passage portion. Vehicle engine.

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