JP2022095234A - Exhaust structure of engine - Google Patents

Abstract

To provide an exhaust structure of an engine which enables an exhaust manifold connected to an exhaust port of a front exhaust engine to be arranged without affecting the engine food height, the height of a centroid of a power unit, and the oil capacity to protect an exhaust emission control device from heat damage.SOLUTION: An exhaust structure of an engine includes: a front exhaust engine 7 provided with an exhaust port 7a which is open to a front side X1 in a vehicle fore and aft direction X; an exhaust emission control device 14 disposed rearward of the engine 7 in the vehicle fore and aft direction X; and an exhaust manifold 12 which allows the exhaust port 7a and the exhaust emission control device 14 to communicate with each other. The exhaust manifold 12 is arranged so as to extend from the exhaust port 7a, pass through the side of the engine 7 in a vehicle width direction Y, and reach the exhaust emission control device 14.SELECTED DRAWING: Figure 5

Description

The present invention relates to an engine exhaust structure.

In the structure in which the exhaust gas purification device is housed together with the engine in the engine room of an automobile, the distance between the engine and the exhaust gas purification device tends to be short due to the layout in the limited space in the engine room, and the exhaust gas is exhausted by heat. There is concern about heat damage to the purification equipment.

For example, in a structure in which an engine and an exhaust purification device are housed in an engine room arranged on the front side of the vehicle body, a structure in which the exhaust purification device is provided near the dash panel at the rear end of the engine room can be considered. In such a structure, in the case of an engine having a high exhaust temperature (for example, a rotary engine) and an engine having a rear exhaust structure (that is, an engine having an exhaust port on the rear facing side of the engine), the exhaust is exhausted. There is a concern that the distance from the port to the exhaust purification device will be short and the exhaust purification device will be damaged by heat.

Therefore, in order to extend the distance from the exhaust port to the exhaust purification device, it is conceivable to adopt a front exhaust engine in which the exhaust port is arranged on the side of the engine facing the front of the vehicle.

Regarding the exhaust structure of a front exhaust engine, Patent Document 1 describes a front exhaust engine in an engine room, and an exhaust manifold extending from an exhaust port on the front side of the engine is connected to an exhaust purification device behind the engine through below the engine. Structure is disclosed.

Further, in Patent Document 2, in a hybrid vehicle having a front exhaust engine and a motor in the engine room, an exhaust manifold extending from an exhaust port on the front side of the engine is connected to an exhaust purification device behind the engine through below the motor. Structure is disclosed.

JP-A-2018-30429 Japanese Unexamined Patent Publication No. 2013-184497

However, in the exhaust structure of the engine shown in Patent Documents 1 and 2, the exhaust port passes from the exhaust port on the front side of the engine of the front exhaust to the lower part of the engine or the motor. As described above, when the exhaust manifold is arranged so as to extend to the rear of the vehicle through below or above the power unit including the engine, there is a concern that the height of the bonnet and the center of gravity of the power unit will increase. Further, when the exhaust manifold is arranged to pass under the engine in order to suppress the height increase, the exhaust manifold is arranged so as to form a dent in the oil pan of the engine and pass through the dent. However, in that case, there is a concern that the capacity of the oil stored in the oil pan will decrease.

The present invention has been made in view of the above circumstances, and the exhaust manifold is arranged to protect the exhaust purification device from heat damage without affecting the height of the bonnet, the height of the center of gravity of the power unit, and the oil capacity. It is intended to provide an exhaust structure for an engine that is capable.

In order to solve the above problems, the exhaust structure of the engine of the present invention is an engine arranged in the engine room of a vehicle, and an exhaust port that opens to the front side of the engine in the front-rear direction of the vehicle is formed. A front exhaust engine, an exhaust purification device arranged behind the engine in the front-rear direction of the vehicle, and an exhaust manifold that communicates the exhaust port and the exhaust purification device are provided, and the exhaust manifold is the exhaust manifold. It is characterized in that it is arranged so as to reach the exhaust purification device from the exhaust port through the side of the engine in the vehicle width direction.

In such a configuration, as an exhaust structure of a front exhaust engine, an exhaust manifold is arranged so as to pass from an exhaust port opening on the front side of the engine to an exhaust purification device through the side of the engine in the vehicle width direction. Therefore, since the exhaust manifold bypasses the engine through the side of the engine, the length of the exhaust manifold should be secured without affecting the height of the bonnet, the height of the center of gravity of the power unit including the engine, and the oil capacity of the oil pan. Will be possible. Therefore, it is possible to lower the temperature of the exhaust gas to a temperature safe for the exhaust purification device while the exhaust gas passes through the inside of the exhaust manifold. As a result, it becomes possible to protect the exhaust purification device from heat damage caused by high-temperature exhaust gas.

In the exhaust structure of the engine, the engine is a power generation engine, and the engine is arranged at a position away from both side surfaces in the vehicle width direction in the engine room, and is located on one side of the engine room. An electric system unit including a generator that generates power by utilizing the rotational driving force generated by the engine is arranged between the engine and the exhaust manifold, and the exhaust manifold is formed on the other side surface of the engine room and the engine. It is preferable that the engine is arranged so as to pass between the engine and the engine.

According to such a configuration, in a configuration in which an electric system unit including a generator is arranged between one side surface of the engine room and the engine, the exhaust manifold is located on the side far from the electric system unit in the engine room, that is, in the engine room. It is arranged so as to pass between the other side surface and the engine. As a result, the exhaust manifold through which the exhaust gas passes can be separated from the electric system unit, and heat damage to the electric system unit can be prevented.

In the exhaust structure of the engine, the ventilation is arranged so as to surround the exhaust manifold apart from the exhaust manifold and form a ventilation path for guiding air from the front of the vehicle toward the engine along the exhaust manifold. It is preferable to further include a road forming member.

In such a configuration, the ventilation path forming member is arranged so as to surround the periphery of the exhaust manifold, and the ventilation path forming member forms a ventilation path for guiding the air from the front of the vehicle toward the engine along the exhaust manifold. This makes it possible to efficiently cool the exhaust manifold by passing air from the front of the vehicle toward the engine through the air passage while the vehicle is running. As a result, the exhaust gas purification device can be reliably protected from heat damage.

In the exhaust structure of the engine, the ventilation passage forming member has a front side portion covering the front side of the exhaust manifold in front of the engine and a lateral outer side of the exhaust manifold on the side of the engine continuously connected to the front side portion. A plan view L-shaped cover member having a side portion to cover is provided, and the cover member includes an introduction port formed at an end portion of the front side portion on a side far from the side portion, and the side portion. It is preferable to have an exhaust port formed at the rear end portion of the square portion.

In such a configuration, the ventilation passage forming member includes an L-shaped cover member in a plan view. Therefore, while the vehicle is running, air flows from the front of the engine into the introduction port formed on the front side portion of the cover member, passes through the ventilation path formed inside the L-shaped cover member, and is rear of the side portion. It is discharged from the discharge port formed at the end. This makes it possible to effectively cool the exhaust manifold by the air passing through the inside of the cover member.

In the exhaust structure of the engine, the vehicle has a tire arranged outside in the vehicle width direction with respect to the engine room, and a partition member for partitioning the front portion of the tire from the engine room. It is preferable that the exhaust port is arranged at the same position as or near the rear end of the partition member in the front-rear direction of the vehicle.

In such a configuration, the discharge port of the cover member is arranged at the same position as or near the rear end of the partition member partitioning between the front portion of the tire and the engine room in the front-rear direction of the vehicle. Therefore, the air discharged from the discharge port of the cover member can be smoothly discharged from the periphery of the tire to the outside of the engine room.

In the exhaust structure of the engine, the vehicle comprises a low heat resistant component around the engine, which further comprises a heat insulating member covering a portion of the exhaust manifold in the vicinity of the low heat resistant component. Is preferable.

In such a configuration, the heat generated from the exhaust manifold can be blocked from the low heat resistant parts having low heat resistance around the engine by the heat insulating member, and the heat damage of the low heat resistant parts can be prevented.

According to the exhaust structure of the engine of the present invention, the exhaust manifold can be arranged without affecting the height of the bonnet, the height of the center of gravity of the power unit, and the oil capacity, and the exhaust purification device can be protected from heat damage. ..

It is a perspective explanatory view which saw the engine and the peripheral part thereof in the exhaust structure of the engine which concerns on embodiment of this invention from the diagonally front upper part. It is a front view which looked at the engine of FIG. 1 and the peripheral part thereof from the front of a vehicle. It is a bottom view of the engine of FIG. 1 and the peripheral portion thereof. It is a top view of the engine of FIG. 1 and the peripheral part thereof. FIG. 2 is a sectional view taken along line VV of FIG. It is an enlarged sectional view around the exhaust manifold of FIG. It is an enlarged perspective view around the L-shaped cover member of FIG. FIG. 6 is a perspective explanatory view showing a state in which the L-shaped cover member of FIG. 7 is removed to expose the exhaust manifold.

The vehicle 1 shown in FIGS. 1 to 4 is a vehicle having both an engine 7 and a motor 10 inside the engine room 2 on the front side of the vehicle 1, such as a hybrid vehicle.

The vehicles 1 shown in FIGS. 1 to 4 are separated from each other in the vehicle width direction Y, and a pair of side frames 3 and 4 extending in the vehicle front-rear direction X and a pair of side frames 3 and 4 extending in the vehicle width direction Y, respectively. A dash panel 5 fixed to the rear end portion and a bumper 6 (see FIG. 5) extending in the vehicle width direction Y and fixed to the front end portions of the pair of side frames 3 and 4 are provided. The engine room 2 is formed by the pair of side frames 3, 4, the dash panel 5, and the bumper 6.

As shown in FIGS. 2 and 5, on the front side of the engine room 2 (front side X1 in the vehicle front-rear direction X), a fan 31, a fan shroud 32 surrounding the fan 31, and a fan shroud 32 are arranged in front of the fan 31. The radiator 33 and the condenser 34 arranged in front of the radiator 33 are arranged. The fan 31 introduces air from the introduction port 35 formed on the front side X1 of the vehicle to generate an air flow W for cooling the radiator 33 and the condenser 34, and sends air to the introduction port 42 of the cover member 16 described later. Is possible.

The vehicle 1 has a tire 26 arranged outside the vehicle width direction Y with respect to the engine room 2 (one side Y1 of the vehicle width directions Y in FIGS. 1 to 5) and the upper half of the tire 26 in an arc shape. A mudguard 28 for covering the tire 26 and a splash guard 29 as a partition member for partitioning the front portion of the tire 26 from the vehicle 1 and the engine room 2 are provided. The upper half of the tire 26 is accommodated in the tire accommodating space 27 formed by the mudguard 28 and the splash guard 29.

In the engine room 2, as a main configuration, an engine 7 and an electric system unit 30 including a generator 9 and a motor 10 are housed.

The engine 7 is used for power generation to drive the generator 9, and as shown in FIGS. 1 to 5, an exhaust port 7a (FIGS. 5 and 8) opened to the front side X1 of the engine 7 in the vehicle front-rear direction X. See) is the front exhaust engine formed. The engine 7 is located inside the engine room 2 at a position away from the side surfaces 2a and 2b (that is, the surfaces of the pair of side frames 4 and 3 facing each other) (see FIG. 4) on both sides of the vehicle width direction Y in the engine room 2. Is located in.

Although various engines can be adopted as the engine 7, it is preferable to adopt a rotary engine as the engine 7 in terms of small size, high output, and low vibration and noise.

As shown in FIGS. 1 to 4, the upper part of the engine 7 includes an intake manifold 13 having one end connected to an intake port (not shown) of the engine 7 as a component of the intake system, and other intake manifolds 13. An air cleaner box 25 connected to the end is arranged. An oil pan 20 for storing the lubricating oil of the engine 7 is provided in the lower part of the engine 7.

In the present embodiment, as shown in FIGS. 1 to 2 and 7 to 8, a water pump 21 and a drive side pulley 23 fixed to the output shaft 7b of the engine 7 are provided on the upper side of the engine 7. The output side pulley 24 fixed to the input shaft 21a of the water pump 21 and the endless belt 22 hung around the drive side pulley 23 and the output side pulley 24 are provided. The endless belt 22 is a low heat resistant component made of rubber, resin, or the like and has low heat resistance. Further, above the rear side of the engine 7 (X2 behind the vehicle and Z1 above the vehicle (see FIG. 2)), as another low heat resistant component, a rubber material that supports the engine 7 from below (Z2 below the vehicle in FIG. 2). Support members (rubber mounts) and batteries are also arranged.

As shown in FIGS. 1 to 5, the electric system unit 30 includes a first speed reducer 8, a generator 9, a motor 10, and a second speed reducer 11.

The first speed reducer 8 decelerates the rotational driving force generated by the power generation engine 7 and transmits it to the generator 9. The generator 9 receives the rotational driving force decelerated by the first speed reducer 8 to generate electric power. The electricity generated by the generator 9 is charged to a battery (not shown) or supplied directly to the motor 10. The motor 10 is rotationally driven by being supplied with at least one of a current supplied from the generator 9 and a current supplied from a battery (not shown) according to the traveling state of the vehicle 1. The second speed reducer 11 decelerates the rotational driving force generated by the motor 10 and transmits it to a drive shaft (not shown). The tire 26 can be rotated by the rotational driving force transmitted to the drive shaft.

As shown in FIGS. 1 to 4, the exhaust structure of the engine 7 includes the engine 7, the exhaust purification device 14, the exhaust pipe 15 communicating with the downstream side of the exhaust purification device 14, and the engine 7 in the engine room 2. It is provided with an exhaust manifold 12 for communicating the exhaust port 7a (see FIGS. 5 and 8) and an exhaust purification device 14, a cover member 16 as a ventilation passage forming member, and an insulator 17 as a heat insulating member. The exhaust pipe 15 extends to the rear X2 of the vehicle through the tunnel portion 5a of the dash panel 5 shown in FIGS. 3 to 4.

The exhaust purification device 14 is arranged at a position behind the engine 7 (rear side X2 of the vehicle front-rear direction X) in the vehicle front-rear direction X.

The exhaust purification device 14 has a function of purifying the exhaust gas of the engine 7 sent through the exhaust manifold 12, and specifically includes a filter containing a catalyst of a metal such as platinum or palladium. ..

If the heat of the exhaust gas is too high, the exhaust gas purification device 14 may deteriorate the purification function or the exhaust gas purification device 14, so that the exhaust gas temperature is set to a predetermined temperature or less (for example, 800 degrees or less). It is necessary to arrange the manifold 12 with a certain length. In the present embodiment, the exhaust manifold 12 has a suction portion 12a (see FIGS. 5 to 6 and 7 to 8) connected to the exhaust port 7a, and is lateral to the engine 7 in the vehicle width direction Y from the exhaust port 7a. It is arranged so as to reach the exhaust gas purification device 14 through the exhaust gas purifying device 14. As a result, the exhaust manifold 12 connected to the exhaust port 7a of the front exhaust engine 7 is concerned while ensuring the length of the exhaust manifold 12 without affecting the height of the bonnet or the height of the center of gravity of the power unit including the engine 7. The exhaust manifold 12 can be arranged.

In the present embodiment, the exhaust manifold 12 is arranged so as to pass on the side opposite to the electric system unit 30 in the vehicle width direction Y in order to avoid heat damage to the electric system unit 30. That is, in a configuration in which the electric system unit 30 is arranged between one side surface 2a of the engine room 2 (the side surface inside the vehicle of the side frame 4 shown in FIGS. 3 to 4) and the engine 7, the exhaust manifold 12 is , It is arranged so as to pass between the other side surface 2b of the engine room 2 (the side surface inside the vehicle of the side frame 3 shown in FIGS. 3 to 4) and the engine 7. The exhaust manifold 12 is composed of an L-shaped pipe extending from the front side portion to the side portion of the engine 7.

As shown in FIGS. 1 to 7, the cover member 16 is arranged so as to be separated from the exhaust manifold 12 and surround the periphery of the exhaust manifold 12. The cover member 16 forms a ventilation passage 41 that guides air from the front of the vehicle 1 toward the engine 7 along the exhaust manifold 12.

As shown in FIGS. 5 to 7, the cover member 16 is continuous with the front side portion 16a covering the front side of the exhaust manifold 12 and the front side portion 16a in front of the engine 7 (that is, the front side X1 in the vehicle front-rear direction X). It has a side portion 16b that covers the lateral outside of the exhaust manifold 12 on the side of the engine 7. That is, the ventilation path forming member of the present embodiment is composed of an L-shaped cover member 16 in a plan view. The L-shaped cover member 16 can continuously cover the L-shaped exhaust manifold 12 without any gaps.

The cover member 16 forms an L-shaped ventilation passage 41 extending along the exhaust manifold 12 when the exhaust manifold 12 is covered. As shown in FIGS. 5 to 7, the cover member 16 has an introduction port 42 of the ventilation passage 41 formed in the end portion 16a1 on the side far from the side portion 16b in the front side portion 16a, and the rear end of the side portion 16b. It has a discharge port 43 of a ventilation passage 41 formed in the portion 16b1.

As shown in FIGS. 5 to 7, the introduction port 42 is open in a direction and a position where air can flow in from the front side X1 of the vehicle, and the air flow due to the traveling wind and the wind generated by the fan 31 when the vehicle is traveling. It is possible to introduce W.

As shown in FIGS. 2 to 3 and 5 to 8, a guide member 19 for guiding the air flow W to the introduction port 42 is provided around the introduction port 42. The guide member 19 has an L-shaped wall protruding from the front X1 of the vehicle.

Further, in the present embodiment, as shown in FIGS. 1 to 2 and 5 to 7, a heat shield member 18 that covers the exhaust manifold 12 from the vehicle front side X1 in the vicinity of the introduction port 42 is provided. The heat shield member 18 protects the fan 31 from the radiant heat by blocking the radiant heat emitted from the exhaust manifold 12. The heat shield member 18 has a main plate portion 18a that covers a portion of the exhaust manifold 12 exposed to the vehicle front X1 from the introduction port 42, and projects from the edge of the main plate portion 18a to the vehicle front X1 to guide the air flow W to the introduction port 42. It has a vertical wall portion 18b to be used. The main plate portion 18a is formed with a slit 18c for cooling the exhaust manifold 12 through a part of the air flow W.

The discharge port 43 is arranged at the same position as or near the rear end 29a of the splash guard 29 in the front-rear direction of the vehicle 1. Therefore, the air discharged from the discharge port 43 of the cover member 16 can be smoothly discharged from the periphery of the tire 26 to the outside of the engine room 2 without being interfered by the splash guard 29.

As shown in FIGS. 3 to 8, the insulator 17 continuously covers both the portion of the exhaust manifold 12 in the vicinity of the low heat resistant component (the component such as the endless belt 22 described above) and the exhaust purification device 14. The insulator 17 is a sheet-like member made of a material having heat insulating properties (glass fiber or the like). The insulator 17 covers a portion of the exhaust manifold 12 on the rear side (rear side X2 in the vehicle front-rear direction X), specifically, a portion protruding outward from the cover member 16.

(Characteristics of this embodiment)
(1)
The exhaust structure of the engine 7 of the present embodiment is an engine 7 arranged in the engine room 2 of the vehicle 1, and is a front surface in which an exhaust port 7a opening on the front side of the engine 7 is formed in the front-rear direction of the vehicle 1. It includes an exhaust engine 7, an exhaust purification device 14 arranged behind the engine 7 in the front-rear direction of the vehicle 1, and an exhaust manifold 12 that communicates the exhaust port 7a and the exhaust purification device 14.

As shown in FIGS. 1 to 4, the exhaust manifold 12 is arranged so as to reach the exhaust purification device 14 from the exhaust port 7a through the side of the engine 7 in the vehicle width direction Y.

In such a configuration, as an exhaust structure of the front exhaust engine 7, the exhaust manifold 12 reaches the exhaust purification device 14 from the exhaust port 7a opening on the front side of the engine 7 through the side of the engine 7 in the vehicle width direction Y. It is arranged in. Therefore, since the exhaust manifold 12 bypasses the engine 7 through the side of the engine 7, the length of the exhaust manifold 12 is secured without affecting the height of the bonnet, the height of the center of gravity of the power unit, and the oil capacity of the oil pan 20. Will be possible. Therefore, it is possible to lower the temperature of the exhaust gas to a temperature safe for the exhaust purification device 14 while the exhaust gas passes through the inside of the exhaust manifold 12. As a result, the exhaust purification device 14 can be protected from heat damage caused by high-temperature exhaust gas.

More specifically, since the exhaust manifold 12 passes through the side of the engine 7 and bypasses the engine 7, the oil pan of the engine 7 is used to pass the exhaust manifold 12 below the engine 7 (Z2 below the vehicle in FIG. 2). It is not necessary to form a dent in 20, and as a result, the capacity of the oil stored in the oil pan 20 is not affected.

When a rotary engine is adopted as the engine 7, the temperature of the exhaust gas tends to be higher (about 900 degrees) than that of the reciprocating engine, but the above configuration should be adopted as the exhaust structure of the rotary engine. For example, it becomes possible to protect the catalyst of the exhaust gas purification device 14 from heat damage without affecting the height of the bonnet and the height of the center of gravity of the power unit. As a result, even if a rotary engine is adopted as the engine 7, it is possible to avoid heat damage to the exhaust purification device 14, and the rotary engine is smaller than the reciprocating engine. The layout of the engine 7 and its surroundings inside the room 2 can be made more compact.

(2)
In the exhaust structure of the engine 7 of the present embodiment, the engine 7 is a power generation engine. As shown in FIGS. 3 to 4, the engine 7 is arranged inside the engine room 2 at a position away from the side surfaces 2a and 2b on both sides of the vehicle width direction Y in the engine room 2. Between one side surface 2a of the engine room 2 and the engine 7, an electric system unit 30 including a generator 9 that generates electric power by utilizing the rotational driving force generated by the engine 7 is arranged. The exhaust manifold 12 is arranged so as to pass between the other side surface 2b of the engine room 2 and the engine 7.

According to such a configuration, in a configuration in which the electric system unit 30 including the generator 9 is arranged between one side surface 2a of the engine room 2 and the engine 7, the exhaust manifold 12 is separated from the electric system unit 30 in the engine room 2. It is arranged so as to pass between the far side, that is, the other side surface 2b of the engine room 2 and the engine 7. As a result, the exhaust manifold 12 through which the exhaust gas passes can be separated from the electric system unit 30, and heat damage to the electric system unit 30 can be prevented.

(3)
As shown in FIGS. 1 to 7, the exhaust structure of the engine 7 of the present embodiment is arranged so as to be separated from the exhaust manifold 12 and surround the periphery of the exhaust manifold 12, and air directed from the front of the vehicle 1 toward the engine 7 is introduced. A cover member 16 as a ventilation passage forming member for forming a ventilation passage 41 for guiding along the exhaust manifold 12 is provided.

According to such a configuration, the cover member 16 is arranged so as to surround the exhaust manifold 12, and the cover member 16 brings air (see air flow W) from the front X1 of the vehicle 1 toward the engine 7 to the exhaust manifold 12. A ventilation path 41 that guides along the line is formed. As a result, the exhaust manifold 12 can be efficiently cooled by passing air from the front X1 of the vehicle 1 toward the engine 7 through the air passage 41 while the vehicle 1 is traveling. As a result, the exhaust gas purification device 14 can be reliably protected from heat damage.

(4)
In the exhaust structure of the engine 7 of the present embodiment, as shown in FIGS. 5 to 7, the cover member 16 as a ventilation path forming member has a front side portion 16a covering the front side of the exhaust manifold 12 in front of the engine 7 and a front side. The portion 16a is continuous with the side portion 16b that covers the lateral outside of the exhaust manifold 12 on the side of the engine 7, and is an L-shaped cover member in a plan view. The cover member 16 is a ventilation passage 41 formed in the introduction port 42 of the ventilation passage 41 formed in the end portion 16a1 far from the side portion 16b in the front side portion 16a and the rear end portion 16b1 in the side portion 16b. It has a discharge port 43.

According to such a configuration, the cover member 16 as the ventilation passage forming member of the present embodiment is an L-shaped cover member in a plan view. Therefore, while the vehicle 1 is traveling, air flows from the front of the engine 7 into the introduction port 42 formed in the front side portion 16a of the cover member 16 and passes through the ventilation passage 41 formed inside the L-shaped cover member 16. It is discharged from the discharge port 43 formed at the rear end portion of the side portion 16b. As a result, the exhaust manifold 12 can be effectively cooled by the air passing through the inside of the cover member 16.

(5)
In the exhaust structure of the engine 7 of the present embodiment, the vehicle 1 is a tire 26 arranged outside the vehicle width direction Y with respect to the engine room 2 (one side Y1 of the vehicle width directions Y in FIGS. 1 to 5). And a splash guard 29 as a partition member for partitioning the front portion of the tire 26 from the vehicle 1 and the engine room 2. The discharge port 43 is arranged at the same position as or near the rear end 29a of the splash guard 29 in the vehicle front-rear direction X.

According to this configuration, the discharge port 43 of the cover member 16 is at or near the same position as the rear end 29a of the splash guard 29 that partitions the portion of the tire 26 on the vehicle front side X1 and the engine room 2 in the vehicle front-rear direction X. It is located at the position of. Therefore, the air discharged from the discharge port 43 of the cover member 16 can be smoothly discharged from the periphery of the tire 26 to the outside of the engine room 2 without being interfered by the splash guard 29.

(6)
In the exhaust structure of the engine 7 of the present embodiment, the vehicle 1 has low heat-resistant parts (such as an endless belt 22 for power transmission to the water pump 21 or a battery or a rubber mount (not shown)) having low heat resistance around the engine 7. In the configuration provided, an insulator 17 is provided as a heat insulating member that covers a portion of the exhaust manifold 12 in the vicinity of the low heat resistant component.

According to such a configuration, the heat generated from the exhaust manifold 12 can be shielded from the low heat resistant parts (endless belt 22 and the like) around the engine 7 having low heat resistance by the insulator 17, and the heat damage of the low heat resistant parts can be prevented. It becomes possible to prevent.

In the present embodiment, even if the heat of the exhaust manifold 12 is trapped inside the insulator 17, the ventilation passage 41 by the cover member 16 exists. Therefore, both the insulator 17 and the exhaust manifold 12 are cooled by the air flow W passing through the ventilation passage 41. It is possible to do.

1 vehicle
2 Engine room 3, 4 Side frame 5 Dash panel 6 Bumper 7 Engine 7a Exhaust port 8 1st reducer 9 Generator 10 Drive motor 11 2nd reducer 12 Exhaust manifold 13 Intake manifold 14 Exhaust purification device 16 Cover member (ventilation path) Forming member)
16a Front part 16b Side part 16b1 Rear end 17 Insulator (insulation member)
26 Tire 29 Splash guard (partition member)
29a Rear end 30 Electrical unit 41 Ventilation passage 42 Inlet port 43 Outlet port

Claims (6)

An engine disposed in the engine room of a vehicle, and a front exhaust engine having an exhaust port formed on the front side of the engine in the front-rear direction of the vehicle.
An exhaust purification device arranged behind the engine in the front-rear direction of the vehicle,
It is provided with an exhaust manifold that communicates the exhaust port and the exhaust purification device.
The exhaust manifold is arranged so as to reach the exhaust purification device from the exhaust port through the side of the engine in the vehicle width direction.
Engine exhaust structure. The engine is a power generation engine.
The engine is arranged in the engine room at a position away from both side surfaces in the vehicle width direction.
An electric system unit including a generator that generates electric power by utilizing the rotational driving force generated by the engine is arranged between the one side surface of the engine room and the engine.
The exhaust manifold is arranged so as to pass between the other side surface of the engine room and the engine.
The exhaust structure of the engine according to claim 1. Further provided is a ventilation path forming member which is arranged so as to surround the exhaust manifold at a distance from the exhaust manifold and forms a ventilation path for guiding air from the front of the vehicle toward the engine along the exhaust manifold.
The exhaust structure of the engine according to claim 1 or 2. The ventilation passage forming member is a plane having a front side portion that covers the front side of the exhaust manifold in front of the engine and a side portion that is continuous with the front side portion and covers the lateral side of the exhaust manifold on the side of the engine. Equipped with an L-shaped cover member visually,
The cover member has an introduction port formed at an end portion of the front side portion far from the side portion and an discharge port formed at the rear end portion of the side portion.
The exhaust structure of the engine according to claim 3. The vehicle includes a tire arranged outside the vehicle width direction with respect to the engine room, and a partition member for partitioning the front portion of the tire from the engine room.
The discharge port is arranged at the same position as or near the rear end of the partition member in the front-rear direction of the vehicle.
The exhaust structure of the engine according to claim 4. The vehicle is equipped with low heat resistant parts around the engine.
The exhaust structure further comprises a heat insulating member that covers a portion of the exhaust manifold in the vicinity of the low heat resistant component.
The engine exhaust structure according to any one of claims 1 to 5.

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