JP2021020577A - Cover structure for engine - Google Patents

Abstract

To achieve suppression in both soundproof performance and heat damage in a vehicle.SOLUTION: A cover structure 100 includes: a cover 10 covering the upper part of an engine 50 mounted on a vehicle; a first tubular part 21 defining a first flow channel 31 for passing air; a heat radiation part 83 (heating part) for partially heating the air in the first tubular part 21 using waste heat of the engine 50; and second tubular parts 22 and 23 that are branched from the downstream side of a portion heated by the heat radiation part 83 (heating part) in the first tubular part 21, and define the first flow channel 31 and second flow channels 32 and 33 communicating with installation places of cooling objects 42 and 43 arranged inside the cover 10.SELECTED DRAWING: Figure 3

Description

The present invention relates to an engine cover structure.

Conventionally, a cover that covers the upper part of an engine mounted on a vehicle has been used for the purpose of reducing the sound emitted from the vehicle to the outside of the vehicle. On the other hand, by covering the upper part of the engine with a cover, heat tends to be trapped in the internal space inside the cover (that is, on the engine side). Therefore, for example, as disclosed in Patent Document 1, the cover is provided with an opening for ventilation.

JP-A-2002-246666

However, as in the conventional technique such as the technique disclosed in Patent Document 1, the heat damage can be suppressed by providing the opening for ventilation in the cover, but on the other hand, the sound emission is reduced. The effect is reduced (that is, the soundproofing performance is reduced).

Therefore, in view of such a problem, an object of the present invention is to provide an engine cover structure capable of achieving both soundproofing performance and suppression of heat damage in a vehicle.

In order to solve the above problems, the engine cover structure of the present invention includes a cover that covers the upper part of the engine mounted on the vehicle, a first tubular portion that defines a first flow path through which air flows, and an engine. A heating part that partially heats the air in the first tubular part using exhaust heat, and a branch from the downstream side of the part heated by the heating part in the first tubular part, to the inside of the first flow path and the cover. It is provided with a second tubular portion that defines a second flow path that communicates with the installation location of the object to be cooled.

The intake passage and the exhaust passage of the engine are connected by an EGR passage, and the EGR passage is provided with a heat radiating portion that dissipates heat in the EGR passage, and the heating portion is a radiating portion of the EGR passage. You may.

A cooling unit that partially cools the air in the first tubular portion may be further provided on the downstream side of the portion of the first tubular portion that is heated by the heating portion.

The cooling unit may partially cool the air in the first tubular portion by using a refrigerant circulating in the cooling cycle mounted on the vehicle.

The cooling cycle has a chamber for temporarily storing the refrigerant, and the cooling unit may be a chamber of the cooling cycle.

The downstream end of the first flow path may communicate with the outside of the vehicle.

According to the present invention, it is possible to achieve both soundproofing performance and suppression of heat damage in a vehicle.

It is a schematic diagram which shows the installation position of the engine in the vehicle which concerns on embodiment of this invention. It is a front sectional view schematically showing the cover structure which concerns on embodiment of this invention. It is a top sectional view schematically showing the cover structure which concerns on embodiment of this invention. It is a side sectional view which shows typically the cover structure which concerns on embodiment of this invention.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown. To do.

<Structure of cover structure>
The configuration of the cover structure 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The cover structure 100 is provided to reduce the sound emitted from the engine 50 mounted on the vehicle 1 to the outside of the vehicle. In FIGS. 1 to 4, the traveling direction of the vehicle 1 is the forward direction, the direction opposite to the traveling direction is the rear direction, and the left and right sides in the state of facing the traveling direction are the left direction and the right direction, respectively. It is shown.

FIG. 1 is a schematic view showing an installation position of the engine 50 in the vehicle 1.

The vehicle 1 includes an engine 50 and a cover 10 as shown in FIG.

The engine 50 is an internal combustion engine that generates power using gasoline or the like as fuel. The power output from the engine 50 is used, for example, to drive the drive wheels of the vehicle 1. The engine 50 is arranged in the engine room 3. The engine room 3 is a space in the vehicle 1 on the front side of the vehicle room 2. The vehicle compartment 2 and the engine compartment 3 are partitioned by structural members such as a toe board.

The cover 10 covers the upper part of the engine 50. In the present embodiment, the cover structure 100 including the cover 10 realizes both soundproofing performance and suppression of heat damage in the vehicle 1.

Hereinafter, the details of the configuration of the cover structure 100 according to the present embodiment will be described with reference to FIGS. 2 to 4.

FIG. 2 is a front sectional view schematically showing the cover structure 100. Specifically, FIG. 2 corresponds to a cross-sectional view taken along the line AA in FIG. FIG. 3 is a top sectional view schematically showing the cover structure 100. Specifically, FIG. 3 corresponds to a cross-sectional view taken along the line BB in FIG. FIG. 4 is a side sectional view schematically showing the cover structure 100. Specifically, FIG. 4 corresponds to a cross-sectional view taken along the line CC in FIG.

In addition, in FIGS. 2 and 3, the illustration of the downstream first tubular portion 21b is omitted. Further, in FIG. 4, illustration of the second tubular portions 22 and 23 is omitted. Further, in FIGS. 3 and 4, the intake passage 60, the exhaust passage 70, the intake side EGR pipe 81, and the exhaust side EGR pipe 82 of the engine 50 are not shown. Further, in FIGS. 2 and 4, at least a part of the cooling cycle 90 is not shown.

As shown in FIGS. 2 to 4, the cover structure 100 includes a cover 10, a first tubular portion 21, a heat radiating portion 83 of the EGR passage 80, and second tubular portions 22, 23. The heat radiating portion 83 of the EGR passage 80 corresponds to an example of the heating portion according to the present invention. Further, the cover structure 100 includes a chamber 92 of a cooling cycle 90. The chamber 92 of the cooling cycle 90 corresponds to an example of the cooling unit according to the present invention.

The first tubular portion 21 defines a first flow path 31 through which air flows. The cross-sectional shape of the first tubular portion 21 may be circular, elliptical, polygonal, or a combination thereof. Specifically, the first tubular portion 21 has an upstream first tubular portion 21a and a downstream first tubular portion 21b connected to the upstream first tubular portion 21a. The upstream first tubular portion 21a is formed by a part of the cover 10. The first flow path 31 has an upstream side first flow path 31a defined by the upstream side first tubular portion 21a and a downstream side first flow path 31b defined by the downstream side first tubular portion 21b. .. The heat radiating portion 83 partially heats the air in the first tubular portion 21 by using the exhaust heat of the engine 50. As a result, a temperature gradient is generated in the first flow path 31, and an air flow is generated.

The second tubular portions 22 and 23 branch from the downstream side of the portion heated by the heat radiating portion 83 in the first tubular portion 21, and are arranged inside the first flow path 31 and the cover 10 to be cooled 42, 43. The second flow paths 32 and 33 that communicate with the installation location of the above are defined. The cross-sectional shapes of the second tubular portions 22 and 23 may be circular, elliptical, polygonal, or a combination thereof. The air in the second flow paths 32 and 33 is sucked by the air flow generated in the first flow path 31, so that the air flow is generated in the second flow paths 32 and 33. As a result, the cooling targets 42 and 43 are appropriately cooled by the air flow.

Hereinafter, the members constituting the cover structure 100 and the members surrounding the cover structure 100 will be described in more detail.

The lower part of the engine 50 is covered with a right side frame 201, a left side frame 202, and an underfloor 203 as structural members of the vehicle 1. The upper part of such an engine 50 is covered with a cover 10.

The cover 10 has a substantially hollow rectangular parallelepiped shape with the front surface and the lower surface open. Specifically, the cover 10 has an upper surface portion 11, a right surface portion 12, a left surface portion 13, a rear surface portion 14, and a flow path defining portion 15. The cover 10 is made of, for example, a resin or metal material.

The upper surface portion 11, the right surface portion 12, the left surface portion 13, and the rear surface portion 14 have a substantially flat plate shape, and form the upper surface, right surface, left surface, and rear surface of the cover 10, respectively.

The flow path defining portion 15 is provided to form the upstream first tubular portion 21a. Specifically, as shown in FIG. 2, the flow path image forming portion 15 is provided between the lower surface of the upper surface portion 11 and the left surface of the right surface portion 12, and the lower surface and the right side of the upper surface portion 11 are provided. It covers the side extending in the front-rear direction, which is the boundary with the left surface of the surface portion 12. The flow path defining portion 15 extends in the front-rear direction.

The upstream first tubular portion 21a includes a right end portion 11a of the upper surface portion 11, an upper end portion 12a of the right surface portion 12, and a flow path defining portion 15. The upstream first flow path 31a defined by the upstream first tubular portion 21a is specifically a space inside the upstream first tubular portion 21a. The upstream first tubular portion 21a extends in the front-rear direction. The front end of the upstream first tubular portion 21a is open. The rear end of the upstream first tubular portion 21a is connected to the downstream first tubular portion 21b as shown in FIG. The downstream first tubular portion 21b extends in the rear-downward direction from the rear end portion of the upstream first tubular portion 21a. The rear lower end of the downstream first tubular portion 21b is open and is located in the vicinity of the through hole 301 provided in the underfloor 203. Therefore, the downstream end of the downstream first flow path 31b defined by the downstream first tubular portion 21b communicates with the outside of the vehicle 1.

The downstream first tubular portion 21b may be formed integrally with the cover 10 or may be a separate body from the cover 10. The downstream first tubular portion 21b is formed of, for example, a resin or metal material.

The heat radiating portion 83 of the EGR passage 80 corresponds to an example of the heating portion according to the present invention that partially heats the air in the first tubular portion 21 by using the exhaust heat of the engine 50.

Specifically, as shown in FIG. 2, the intake passage 60 and the exhaust passage 70 of the engine 50 are connected by an EGR passage 80. The intake passage 60 includes a plurality of intake pipes 61 connected to intake ports of each combustion chamber of the engine 50, and an intake manifold 62 to which the plurality of intake pipes 61 merge. The exhaust passage 70 includes a plurality of exhaust pipes 71 connected to exhaust ports of each combustion chamber of the engine 50, and an exhaust manifold 72 to which the plurality of exhaust pipes 71 merge. The EGR passage 80 connects the intake manifold 62 and the exhaust manifold 72. The EGR passage 80 includes an intake side EGR pipe 81 connected to the intake manifold 62, an exhaust side EGR pipe 82 connected to the exhaust manifold 72, and a heat radiating portion 83. The heat radiating section 83 is provided between the intake side EGR pipe 81 and the exhaust side EGR pipe 82, and dissipates heat in the EGR passage 80.

The heat radiating portion 83 of the EGR passage 80 is located near the front end portion of the upstream first tubular portion 21a. As a result, the front air of the air in the upstream first tubular portion 21a is heated by the heat radiating portion 83. Therefore, in the first flow path 31, a temperature gradient is generated, so that an air flow is generated. Specifically, as shown by the arrow F1 in FIGS. 3 and 4, the upstream side first flow path 31a advances in the rear direction, the downstream side first flow path 31b advances in the rear downward direction, and the outside of the vehicle 1 An air flow is created so that it is expelled into the air.

Specifically, the second tubular portions 22 and 23 are branched from the flow path defining portion 15 of the upstream first tubular portion 21a. The tip of the second tubular portion 22 is open and is located at an installation location (that is, in the vicinity of the cooling target 42) of the cooling target 42 arranged between the upper surface portion 11 of the cover 10 and the engine 50. .. Specifically, the second flow path 32 is a space inside the second tubular portion 22. Therefore, the upstream first flow path 31a and the installation location of the cooling target 42 are communicated with each other by the second flow path 32. The tip of the second tubular portion 23 is open and is located at the installation location (that is, in the vicinity of the cooling target 43) of the cooling target 43 arranged between the upper surface portion 11 of the cover 10 and the engine 50. .. Specifically, the second flow path 33 is a space inside the second tubular portion 23. Therefore, the upstream first flow path 31a and the installation location of the cooling target 43 are communicated with each other by the second flow path 33.

The cooling targets 42 and 43 are particularly required to be cooled in the space inside the cover 10 (that is, on the engine 50 side). The cooling targets 42 and 43 are, for example, alternators or parts related to fuel supply of the engine 50 (for example, a fuel injection valve). In the example shown in FIGS. 2 to 4, two cooling targets 42 and 43 are shown, but the number of cooling targets may be other than 2.

The second tubular portions 22 and 23 may be formed integrally with the cover 10 or may be separate from the cover 10. The second tubular portions 22, 23 are formed of, for example, a resin or a metal material.

As described above, the air in the front side of the air in the upstream side first tubular portion 21a is heated by the heat radiating portion 83, so that the upstream side first is shown by the arrow F1 in FIGS. 3 and 4. An air flow is generated so as to proceed backward in the flow path 31a. As a result, the air in the second flow paths 32 and 33 is sucked by the air flow generated in the upstream first flow path 31a. Therefore, an air flow is generated in the second flow paths 32 and 33. Specifically, as shown by arrows F2 and F3 in FIG. 3, air so that the second flow paths 32 and 33 proceed from the installation location of the cooling targets 42 and 43 toward the upstream first flow path 31a. Flow occurs. As a result, the cooling targets 42 and 43 can be appropriately cooled by the flow of air.

As described above, according to the cover structure 100, heat damage in the vehicle 1 can be suppressed without providing the cover 10 with an opening for ventilation. Therefore, since it is possible to suppress the deterioration of the soundproofing performance, it is possible to achieve both the soundproofing performance and the suppression of heat damage in the vehicle 1.

The chamber 92 of the cooling cycle 90 is an example of the cooling unit according to the present invention that partially cools the air in the first tubular portion 21 on the downstream side of the portion heated by the heat radiating portion 83 in the first tubular portion 21. Equivalent to. Specifically, the chamber 92 partially cools the air in the first tubular portion 21 with a refrigerant circulating in the cooling cycle 90 mounted on the vehicle 1.

Specifically, as shown in FIG. 3, the cooling cycle 90 has a circulation path 91 through which the refrigerant circulates and a chamber 92 provided in the circulation path 91. Although not shown in FIG. 3, the circulation path 91 is provided with a compressor, a condenser, an expansion valve, and an evaporator. The chamber 92 is a portion of the circulation path 91 whose diameter is expanded, and temporarily stores the refrigerant.

The chamber 92 of the cooling cycle 90 is located at the rear end of the upstream first tubular portion 21a. As a result, the rear air of the air in the upstream first tubular portion 21a is cooled by the chamber 92. Thereby, the degree of the temperature gradient generated in the first flow path 31 can be further increased. Therefore, the flow velocity of air in the first flow path 31 can be increased. Therefore, the cooling targets 42 and 43 can be cooled more effectively by the flow of air.

<Effect of cover structure>
Subsequently, the effect of the cover structure 100 according to the embodiment of the present invention will be described.

The cover structure 100 according to the present embodiment partially removes the air in the first tubular portion 21 by using the exhaust heat of the engine 50 and the first tubular portion 21 that defines the first flow path 31 through which air flows. It is provided with a heating unit for heating (specifically, a heat radiating unit 83 of the EGR passage 80). As a result, the exhaust heat of the engine 50 can be effectively used to generate an air flow in the first flow path 31. Further, the cover structure 100 branches from the downstream side of the portion of the first tubular portion 21 that is heated by the heating portion, and is the installation location of the first flow path 31 and the cooling targets 42 and 43 arranged inside the cover 10. The second tubular portions 22 and 23 are provided so as to define the second flow paths 32 and 33 communicating with the above. As a result, an air flow can be generated so that the second flow paths 32 and 33 proceed from the installation location of the cooling targets 42 and 43 toward the upstream first flow path 31a. Therefore, the cooling targets 42 and 43 can be appropriately cooled by the flow of air. Therefore, heat damage in the vehicle 1 can be suppressed without providing the cover 10 with an opening for ventilation. Therefore, both the soundproofing performance of the vehicle 1 and the suppression of heat damage can be achieved at the same time.

Further, in the cover structure 100 according to the present embodiment, the heating portion is preferably the heat radiating portion 83 of the EGR passage 80. Thereby, it is possible to appropriately realize that the air in the first tubular portion 21 is partially heated by using the exhaust heat of the engine 50 radiated from the heat radiating portion 83.

Further, the cover structure 100 according to the present embodiment further includes a cooling portion that partially cools the air in the first tubular portion 21 on the downstream side of the portion of the first tubular portion 21 that is heated by the heating portion. Is preferable. As a result, the degree of the temperature gradient generated in the first flow path 31 can be made larger, so that the flow velocity of air in the first flow path 31 can be increased. Therefore, the cooling targets 42 and 43 can be cooled more effectively by the flow of air.

Further, in the cover structure 100 according to the present embodiment, it is preferable that the cooling unit partially cools the air in the first tubular portion 21 by using the refrigerant circulating in the cooling cycle 90 mounted on the vehicle 1. .. Thereby, the air in the first tubular portion 21 can be effectively cooled by effectively utilizing the refrigerant circulating in the cooling cycle 90.

Further, in the cover structure 100 according to the present embodiment, the cooling unit is preferably the chamber 92 of the cooling cycle 90. Here, the chamber 92 is a portion whose diameter is expanded in the circulation path 91 of the cooling cycle 90. Therefore, the chamber 92 has a higher ability to cool the ambient air than the other parts of the circulation path 91. Therefore, by using such a chamber 92 as a cooling unit, the air in the first tubular portion 21 can be cooled more effectively.

Further, in the cover structure 100 according to the present embodiment, it is preferable that the downstream end portion of the first flow path 31 communicates with the outside of the vehicle 1. As a result, a temperature gradient can be appropriately generated in the first flow path 31, so that an air flow can be appropriately generated in the first flow path 31.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and various modifications within the scope of claims are described. It goes without saying that the modified examples also belong to the technical scope of the present invention.

For example, in the above description, a part of the first tubular portion 21 is integrally formed with the cover 10, but the first tubular portion 21 may be a separate body from the cover 10. In that case, the first tubular portion 21 may be arranged through the space inside the cover 10, or may be arranged in the space outside the cover 10 without passing through the space inside the cover 10.

Further, for example, in the above description, an example in which the first tubular portion 21 extends backward from the upstream side and then extends in the rearward downward direction has been described, but the path of the first tubular portion 21 is particularly applicable to such an example. Not limited. For example, a part or all of the first tubular portion 21 may extend in the left-right direction.

Further, for example, in the above, the example in which the downstream end of the first flow path 31 communicates with the outside of the vehicle 1 has been described, but the downstream end of the first flow path 31 communicates with the outside of the vehicle 1. It does not have to communicate. For example, the downstream end of the first flow path 31 may be located in the engine room 3, in which case the air flowing through the first flow path 31 is not discharged to the outside of the vehicle 1 and is not discharged to the outside of the vehicle 1. It is discharged within 3.

Further, for example, in the above description, the example in which the second tubular portions 22 and 23 are branched from the flow path defining portion 15 of the cover 10 has been described, but a part or all of the second tubular portions 22 and 23 is the upper surface. It may be integrally formed with the portion 11, the right surface portion 12, the left surface portion 13, or the rear surface portion 14.

Further, for example, in FIGS. 2 and 3 referred to above, an example in which the second tubular portions 22 and 23 extend in one direction has been described, but the path of the second tubular portions 22 and 23 is such an example. Is not particularly limited to. For example, the second tubular portions 22, 23 may be bent or may extend in a direction different from the examples shown in FIGS. 2 and 3.

Further, for example, in the above description, an example in which the heat radiating portion 83 of the EGR passage 80 is used as a heating portion for partially heating the air in the first tubular portion 21 by using the exhaust heat of the engine 50 has been described. As the heating unit, a unit other than the heat radiating unit 83 of the EGR passage 80 may be used. For example, when the vehicle 1 is provided with a turbocharger, the turbocharger may be used as a heating unit. In FIGS. 2 to 4 referred to above, an example is shown in which the heat radiating portion 83 as the heating portion is located in front of the front end portion of the upstream first tubular portion 21a, but the heating portion is , It may be located behind the front end portion of the upstream first tubular portion 21a.

Further, for example, in the above description, an example in which the chamber 92 of the cooling cycle 90 is used as the cooling unit for partially cooling the air in the first tubular portion 21 has been described, but the chamber of the cooling cycle 90 is used as the cooling unit. Those other than 92 may be used. For example, a cooling unit that partially cools the air in the first tubular portion 21 by using a cold source other than the refrigerant circulating in the cooling cycle 90 may be used. Further, for example, a portion different from the chamber 92 in the cooling cycle 90 may be used as the cooling portion.

Further, for example, in the above description, an example in which the upper part of the engine 50 is covered by the cover 10 and the lower part of the engine 50 is covered by the structural member of the vehicle 1 has been described, but the lower part of the engine 50 is the structure of the vehicle 1. It may be covered with a lower cover which is a member different from the member. In that case, a so-called capsule structure in which the entire engine 50 is covered by the cover 10 and the lower cover can be formed.

The present invention can be used for engine cover structures.

1 Vehicle 2 Vehicle interior 3 Engine room 10 Cover 11 Top surface 12 Right surface 13 Left surface 14 Rear surface 15 Flow path imager 21 First tubular part 21a Upstream side First tubular part 21b Downstream side First tubular part 22, 23 2nd tubular portion 31 1st flow path 31a Upstream side 1st flow path 31b Downstream side 1st flow path 32,33 2nd flow path 42,43 Cooling target 50 Engine 60 Intake passage 61 Intake pipe 62 Intake manifold 70 Exhaust passage 71 Exhaust pipe 72 Exhaust manifold 80 EGR passage 81 Intake side EGR pipe 82 Exhaust side EGR pipe 83 Heat dissipation part (heating part)
90 Cooling cycle 91 Circulation path 92 Chamber (cooling part)
100 Cover structure 201 Right side frame 202 Left side frame 203 Underfloor 301 Through hole

Claims (6)

A cover that covers the top of the engine mounted on the vehicle,
The first tubular part that defines the first flow path through which air flows,
A heating unit that partially heats the air in the first tubular portion using the exhaust heat of the engine,
A second flow path that branches from the downstream side of the portion of the first tubular portion that is heated by the heating portion and communicates the first flow path and the installation location of the cooling target arranged inside the cover. The second tubular part to be defined and
To prepare
Engine cover structure. The intake passage and the exhaust passage of the engine are connected by an EGR passage.
The EGR passage is provided with a heat radiating portion that dissipates heat in the EGR passage.
The heating portion is the heat radiating portion of the EGR passage.
The engine cover structure according to claim 1. A cooling portion for partially cooling the air in the first tubular portion is further provided on the downstream side of the portion of the first tubular portion that is heated by the heating portion.
The engine cover structure according to claim 1 or 2. The cooling unit partially cools the air in the first tubular portion by using a refrigerant circulating in the cooling cycle mounted on the vehicle.
The engine cover structure according to claim 3. The cooling cycle has a chamber that temporarily stores the refrigerant.
The cooling unit is the chamber of the cooling cycle.
The engine cover structure according to claim 4. The downstream end of the first flow path communicates with the outside of the vehicle.
The engine cover structure according to any one of claims 1 to 5.

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