JP2013112201A - Heat exhaust structure of engine compartment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple heat exhaust structure of an engine compartment, which requires only a small space for installation in the engine compartment and a front fender, and which can discharge hot air in the engine compartment to the outside.SOLUTION: The heat exhaust structure includes an air channel 4 which is provided along the wheel house 3 to lead some 9 of the airflows, flowing in the rotational direction around the tire 2 by being pulled by the rotation of the tire 2, inward from the rear of the tire 2 and to lead out some of the airflows from the front of the tire 2, and a communication passage 6 which communicates a midway part of the air channel 4 and the inside of the engine compartment 5 with each other. In the air channel 4, a cross-sectional area is reduced toward a downstream side from an upstream side in a predetermined area C, and a junction of the air channel 4 and the communication passage 6 is provided on the downstream side with respect to the predetermined area C.

Description

  The present invention relates to a heat release structure for an engine room that discharges hot air in the engine room of a vehicle to the outside.

  In an automobile engine room, a large number of various parts are packed and arranged, and since there are few gaps between the parts, it is difficult for hot air to escape. If hot air accumulates in the engine room, the temperature in the engine room tends to rise, which is not preferable because it is necessary to improve the heat resistance of each part or to install a heat shield member as appropriate. In order to suppress the temperature rise in the engine room, technologies for efficiently discharging hot air from the engine room are disclosed in Patent Documents 1 and 2 and the like.

  In the heat removal structure of the engine room disclosed in Patent Document 1, in order to discharge the hot air generated in the engine room to the outside, an exhaust port is provided on the outer surface of the front fender that becomes negative pressure when the vehicle travels, And the exhaust port communicate with each other through a duct. According to this heat release structure of the engine room, hot air in the engine room is discharged outside through the duct from the exhaust port on the outer surface of the front fender, which becomes negative pressure when the vehicle is traveling.

  In the exhaust heat apparatus for the engine room disclosed in Patent Document 2, an opening is provided in the engine hood to exhaust the hot air generated in the engine room to the outside, and the opening is opened and closed with a sliding cover body. It has a mechanism. Since the opening is provided in a region where the negative pressure is generated when the vehicle is traveling, according to the heat exhaust device of the engine room, the opening is opened when the vehicle is traveling, so that the opening is opened in the engine room. The hot air is discharged outside.

Japanese Patent Laid-Open No. 2004-255556 JP 2006-168631 A

  However, in the heat removal structure of the engine room disclosed in Patent Document 1, the duct must be arranged in the engine room, the front fender, etc., so that the space in the engine room and the front fender is particularly small like a small car. There is a problem that it is difficult to adopt in a vehicle with little space.

  Further, the engine room exhaust heat device disclosed in Patent Document 2 is such that the opening portion of the engine hood is slid open and closed by the cover body, so that the mechanism becomes complicated and the manufacturing cost becomes expensive. There is a problem in terms.

  The present invention has been made in view of these problems, and requires less installation space in the engine room and the front fender, and efficiently discharges hot air in the engine room to the outside with a simple structure. An object of the present invention is to provide a heat release structure for an engine room.

  In order to solve the above-described problems, the engine room heat release structure according to the present invention introduces a part of the airflow that flows in the rotation direction around the tire by being dragged by the rotation of the tire from the rear of the tire. The air flow path provided along the wheel house and the communication path that communicates the middle portion of the air flow path with the interior of the engine room are provided.

  According to the heat removal structure of the engine room having such a configuration, a part of the airflow that flows in the rotation direction around the tire while being driven by the rotation of the tire is introduced into the air flow path when the vehicle travels. Pass through the junction of the road and the communication path. Since the confluence of the air flow path and the communication path is negative pressure due to the air flow when the vehicle is running, the hot air in the engine room flows into the air flow path through the communication path and flows in the air flow path. And is discharged from the front of the tire to the outside.

  In the heat release structure of the engine room, the air flow path has a reduced cross-sectional area from an upstream side to a downstream side at a predetermined portion, and a confluence of the air flow path and the communication path is the predetermined path. It is desirable that it is provided downstream from the site.

  According to the heat release structure of the engine room having such a configuration, the air flow introduced into the air flow path is accelerated at a portion where the flow path cross-sectional area is reduced, and then the junction of the air flow path and the communication path To reach. As a result, the negative pressure at the junction of the air flow path and the communication path becomes even lower, the flow rate of hot air exhausted from the engine room through the communication path and the air flow path increases, and the temperature inside the engine room increases. The rise is further suppressed.

  According to the heat removal structure of the engine room of the present invention, the installation space in the engine room and the front fender is hardly required, and the hot air in the engine room can be efficiently discharged outside with a simple structure. .

It is a figure which shows the heat removal structure of the engine room which concerns on embodiment of this invention, Comprising: It is a left view of the vehicle which shows a tire periphery. It is BB sectional drawing of FIG. However, the tire is not a cross-sectional view, but only the outer shape is shown by a two-dot chain line, and the air duct is only the end face. It is AA sectional drawing of FIG. However, the tire is not a cross-sectional view, but only the outer shape is shown by a two-dot chain line, and the air duct is only the end face. It is a figure which shows the heat removal structure of the engine room which concerns on embodiment of this invention, Comprising: It is the fragmentary sectional view represented by cut | disconnecting an air duct.

  Hereinafter, an engine room heat release structure according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the heat removal structure 1 for the engine room according to the present embodiment includes an air flow path 4 provided along the wheel house 3, an intermediate part of the air flow path 4, and an engine room 5. And a communication passage 6 communicating with the inside.

  The air flow path 4 is formed in an air duct 41 disposed along the inner peripheral surface of the wheel house 3. An opening 41a on one end side of the air duct 41 is disposed behind the tire 2 and opens substantially downward so that an airflow flowing in the rotation direction around the tire 2 is introduced by being dragged by the rotation of the tire 2. Yes. The airflow introduced from the opening 41a flows in the air duct 41 arranged in a substantially arc shape in the same direction as the rotation direction of the tire 2, and the opening on the other end side of the air duct 41 arranged in front of the tire 2 Derived from the part 41b. Since the opening 41b on the other end side is also opened substantially downward, the derived air current is also discharged substantially downward.

  Further, the cross-sectional area of the air flow path 4 is reduced from the upstream side to the downstream side in a predetermined region C upstream from the top position 8 (the highest portion of the air flow path 4). That is, the cross-sectional area of the air flow path 4 in the air duct 41 is relatively large between the opening 41a and the predetermined area C as shown in FIG. As shown in FIG. 3, the width in the vehicle width direction of the air duct 41 (the cross-sectional area of the air flow path 4) is reduced at the top position 8 of the air flow path 4. Thereby, the airflow flowing through the air flow path 4 is accelerated when passing through the predetermined region C. In FIG. 3, the cross section of the air duct 41 before the cross-sectional area is reduced is indicated by a two-dot chain line so that the change in the cross-sectional area can be easily understood.

  As shown in FIG. 3, the communication path 6 communicates the air flow path 4 in the air duct 41 and the engine room 5 and allows hot air to flow from the engine room 5 into the air flow path 4. . In the example shown in FIG. 3, the communication path 6 is formed in a through hole 61 formed in the air duct 41, a hose joint 62 formed in an edge portion of the through hole 61, and a wall surface 51 that partitions the engine room 5. The through hole 63 includes a hose joint 64 formed at the edge of the through hole 63 and a hose 65 connected to the hose joints 62 and 64. The communication path 6 only needs to communicate the air flow path 4 and the engine room 5 and allow hot air to flow from the engine room 5 into the air flow path 4, and the configuration is limited to the above. Not.

  When the vehicle having the engine room heat removal structure 1 as described above travels, as indicated by an arrow 9 in FIGS. 1 and 4, the tire 2 is dragged by rotation and flows around the tire 2 in the rotation direction. A part of the air flow is introduced into the air flow path 4 in the air duct 41 from the opening 41 a of the air duct 41. The introduced air flow is accelerated in the predetermined region C, and then passes through the junction of the air flow path 4 and the communication path 6. Since the confluence of the air flow path 4 and the communication path 6 becomes negative pressure due to the flow of airflow, the hot air in the engine room 5 flows toward the air flow path 4 through the communication path 6, and the air flow path 4 The air flows through the air 2 and is discharged from the opening 41b of the air duct 41 provided in front of the tire 2 to the outside.

  In other words, according to the heat removal structure 1 for the engine room according to the present embodiment, hot air in the engine room is discharged outside through the communication path 6 and the air flow path 4 when the vehicle is running, and the temperature in the engine room is made efficient. Can be reduced. Moreover, the engine room heat removal structure 1 according to the present embodiment is a simple structure including the air flow path 4, the communication path 6, and the like. Further, since the wheel house 3 and the engine room 5 are usually adjacent to each other, the communication path 6 can be shortened. Therefore, a space for installing the communication path 6 or the like in the engine room 5 or in the front fender. Is rarely needed.

  Further, according to the heat release structure 1 for the engine room according to the present embodiment, both ends of the air flow path 4 are opened downward, and the communication path 6 communicated with the engine room 5 in the middle of the air flow path 4. Therefore, it is difficult for external muddy water, rainwater, and the like to enter the engine room 5 through the air flow path 4 and the communication path 6. Of course, it is desirable to provide the communication path 6 in the vicinity of the top position 8 of the air flow path 4 in order to prevent intrusion of muddy water, rainwater and the like into the engine room 5 as much as possible.

  In the embodiment described above, a portion (predetermined region C) that reduces the cross-sectional area of the air flow path 4 from the upstream side to the downstream side is provided in the vicinity of the top position 8 of the air flow path 4. The portion may be provided in other portions of the air flow path 4. However, when the airflow passes through the reduced portion of the cross-sectional area of the air flow path 4, the wall surface (inner wall surface of the air duct 41) that forms the air flow path 4 is pressed toward the flow direction. By providing the reduced portion near the top position 8 of the air flow path 4, a forward force can be applied to the vehicle, and the running resistance of the vehicle can be reduced.

  In the above-described embodiment, the air flow path 4 has its cross-sectional area gradually reduced in the predetermined region C, but the cross-sectional area of the air flow path 4 has been rapidly reduced at a predetermined position. It may be a thing.

  The present invention can be applied, for example, in a wheel house as a structure for discharging hot air in an engine room of an automobile to the outside.

DESCRIPTION OF SYMBOLS 1 Heat release structure of engine room 2 Tire 3 Wheel house 4 Air flow path 5 Engine room 6 Communication path C Predetermined area (predetermined part)

Claims (2)

An air flow path provided along the wheel house so as to introduce a part of the airflow flowing in the rotation direction around the tire by being dragged by the rotation of the tire from the rear of the tire and deriving from the front of the tire,
A communication path communicating the middle part of the air flow path and the engine room;
An engine room heat release structure characterized by comprising In the heat removal structure of the engine room according to claim 1,
The air flow path has a reduced cross-sectional area from an upstream side to a downstream side at a predetermined site, and a confluence of the air flow channel and the communication path is provided downstream from the predetermined site. The engine room heat release structure.