JP2007022204A - Hood structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hood structure of an automobile for preventing increase of an air resistance at the time of traveling, and solving a turning phenomenon when receiving side winds. <P>SOLUTION: When an automobile receives side winds at the time of traveling, pressure difference between the air received by the front of the vehicle body is detected by sensors 42, 42'. When the pressure difference between the airs is larger than a predetermined value, actuators 11, 11' actuate a switching valve 33, and the inside of a vacuum tank 34 is communicated with hollow parts 29 of right and left edge weather strips 11, 11' via the switching valve 33, so as to form a gap 13 between edges 2L, 2R of right and left hoods 2 and the vehicle body 5. The air in an engine room 1 is emitted on a fender in the lee, so as to solve a turning phenomenon that the front of the vehicle body tends to rotate toward the lee. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automobile hood structure, and more particularly, to an automobile hood structure in which a structure of a seal disposed between a hood and a vehicle body is improved.

  Conventionally, in a general automobile, a weather strip that is interposed between the rear edge of the hood and the vehicle body and is elastically sealed at the upper rear edge of the engine room. ing.

Further, weather strips are also disposed on both side edges and the front edge of the engine room, and there are some which are configured to surround the engine room with the weather strip when the engine room is viewed in plan. When the engine room is closed with the hood, the gap formed between the hood and the vehicle body is sealed with a weather strip.
No. 6-5961

  By the way, when the automobile is traveling straight ahead, the upper surface of the hood is generally a large negative pressure except for the rear end portion, so that a large pressure difference is generated between the pressure in the engine room and the pressure on the upper surface of the hood.

  However, if the gap between the peripheral portion of the hood and the peripheral portion of the engine room is not sealed, the crosswind running performance maintaining the straight traveling performance is improved, but the air resistance is deteriorated. On the other hand, if the gap between the edge of the hood and the peripheral edge of the engine room is sealed with a weatherstrip, the air resistance is reduced, but the negative pressure generated in the fender on the leeward side is large when subjected to crosswinds. As a result, a turning phenomenon occurs in which the front part of the vehicle body wraps around to the leeward side, and the lateral wind stability is lowered. For this reason, the reduction of air resistance and the improvement of cross wind stability could not be achieved accurately.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an automobile hood structure capable of achieving both reduction in air resistance during driving and improvement in cross wind stability.

  In order to solve the above-described problems, a hood structure for an automobile of the present application includes a hood that closes an equipment space portion in front of a driver's seat of the automobile, and a weather strip is provided between the hood and a vehicle body at the periphery of the equipment space portion. In the hood structure of an automobile that is placed and plugged in the gap, the pressure difference of the cross wind received by the left and right parts on the front side of the running vehicle is detected, and when this pressure difference is greater than or equal to a predetermined value, the hood with the lower pressure is A turning adjustment means for forming a passage for discharging the air in the equipment space between the edge and the vehicle body is provided.

  According to the hood structure of an automobile of the present invention, when a crosswind is received when the automobile is traveling straight ahead, the turning adjustment means has a smaller left or right pressure depending on the magnitude of the left and right pressure difference received from the crosswind. By opening a gap between the hood and the vehicle body, the air in the equipment space blows out from this gap, so when traveling under a crosswind, the air flowing from the hood to the vehicle body side adheres to the vehicle body side surface on the downstream side Can be prevented.

  This makes it possible to improve the crosswind stability by reducing the turning phenomenon that the front part of the vehicle body that has received the wind pressure changes direction to the downstream side of the airflow, even when receiving a crosswind especially during high-speed driving, etc. Air resistance can be reduced.

  Hereinafter, the best mode for carrying out the present invention will be described. FIG. 1A shows the hood structure of an automobile according to this embodiment. In the hood structure of the automobile shown in FIG. 1A, reference numeral 1 denotes an engine room as an equipment space portion at the front of the vehicle body, and reference numeral 2 denotes a hood.

  In this automobile hood structure, weather strips 8, 11, 11 ′ and 12 are interposed between a hood 2 that covers the upper part of the engine room 1 and a vehicle body 5 that defines the engine room 1. is there. Opening / closing hinges 3 of the hood 2 are fixed to the vehicle body 5 on both sides of the rear portion of the hood 2 on the rear side of the vehicle body. The hood 2 can be rotated at a predetermined angle with respect to the vehicle body 5 such that the front side of the vehicle body 5 is opened by the hinge 3.

  A lock mechanism 4 that locks the hood 2 in a closed state is provided at the front central portion of the hood 2 on the vehicle body front side. Further, the both sides of the front edge of the rear surface of the hood 2 abut against the vehicle body 5 when the hood 2 is closed, and the hood 2 has a predetermined height that should be maintained from the upper edge of the engine room 1 of the vehicle body 5. The hood bumper 6 to be held is provided as a height adjusting member that keeps the gap 13 between the hood 2 and the vehicle body 5 constant. Due to these positional relationships, when the engine room 1 is closed with the hood 2, a gap 13 is formed between the lower surface of the hood 2 and the vehicle body 5.

  Around the engine room 1, a front edge 10, a right edge 9 ', a left edge 9, and a rear edge 7 on the upper surface of the vehicle body 5 are formed. Weather strips 12, 11 ′, 11, 8 are fixed to the front edge 10, right edge 9 ′, left edge 9, and rear edge 7 of the vehicle body 5 with clips 28 (see FIG. 1B) or the like. Has been. The weather strips 12, 11 ′, 11 and 8 are attached so as to surround the engine room 1, and the gap 13 between the hood 2 and the vehicle body 5 can be closed when the hood 2 is closed.

  In this embodiment, at least the weather strips 11, 11 'at the right edge and the left edge of the weather strips 12, 11', 11, 8 have a hollow cross section. The hollow portion 29 forming the hollow cross section of the weather strips 11 and 11 'is formed so as to extend over the entire weather strips 11 and 11' at the left and right edges.

  As shown in FIG. 1 (a) and FIG. 2, the hollow portions 29 at the left and right edges of the weather strips 11 and 11 ′ are not formed with other holes other than the holes communicating with the hoses 30 and 31, Each is an independent closed space. The other ends of the hoses 30 and 31 of the hollow portion 29 at the left and right edge portions are gathered at one place, and one end of the other hose 32 is connected. The other end of the hose 32 is connected to a switching valve 33 as a switching device.

  One end of a hose 35 is connected to a negative pressure source such as a brake vacuum tank 34 in the engine room 1, and the other end of the hose 35 is connected to a switching valve 33. The switching valve 33 is controlled by the actuator 40 and operates to switch the passage to either the hose 35 on the vacuum tank 34 side or the hose 36 on the intake side.

  As shown in FIGS. 1 and 2, pressure sensors 42 and 42 ′ for detecting air pressure are disposed near both ends of the front bumper 41. The signal lines 43 and 43 ′ of the sensors 42 and 42 ′ are connected to the actuator 40 via the amplifier 44. Here, when the absolute value of the difference between the left and right pressures is larger than a predetermined value, the actuator 40 is configured to switch the passage of the switching valve 33 to the hose 35 on the vacuum 34 side. Conversely, when the difference between the left and right pressures is smaller than a predetermined value, the actuator 40 is configured to switch the passage of the switching valve 33 to the hose 36 on the intake duct 37 side.

  Sensors 42 and 42 ′ are installed on the front bumper 41, which is the front left and right parts of the vehicle body 5, as detection units that detect the pressure of air received by the vehicle body 5 during travel. The actuator 40 controls to reduce the thickness of the hollow portion 29 that is the thickness adjusting portion when the pressure detected by the sensors 42 and 42 ′ is equal to or greater than a predetermined value.

  The turning control device 100 includes a hood bumper 6 that constitutes a height adjustment member, a hollow portion 29 that constitutes a thickness adjustment portion provided in the weather strips 11 and 11 ′, and a pressure of air in front of the traveling vehicle body. Sensors 42 and 42 ′ constituting a detection unit to be detected, and a driving device 110 that controls the thickness of the hollow portion 29 to be thin when the pressure detected by the sensors 42 and 42 ′ is equal to or greater than a predetermined value. Have.

  The driving device 110 (see FIG. 2) of the turning control device 100 includes a switching valve 33 (switching device), hoses 30, 31, and 32 that connect the hollow portion 29 and the switching valve 33, and a vacuum tank that serves as a negative pressure source. 34, a hose 35 that connects the vacuum tank 34 and the switching valve 33, an actuator 40 that controls the switching valve 33, and an amplifier 44 that amplifies the detection signals of the sensors 42 and 42 ′.

  The actuator 40 is composed of, for example, an electromagnetic valve provided with a microcomputer and an interface circuit. The microcomputer calculates the difference between the detected air pressures from the electric signals indicating the pressures output from the sensors 42 and 42 ', and subtracts the predetermined value stored in the memory in advance from the difference between the air pressures. When is greater than or equal to a predetermined value, the connection flow path of the switching valve 33 is controlled until the difference becomes equal to or smaller than the predetermined value.

  The weather strips 11, 11 ′ at the left and right edge portions are made of, for example, an elastic body such as foam rubber, and the deformation characteristics thereof are such that the hollow portion 29 is placed in the vacuum tank 34 as shown in FIGS. When the negative pressure is applied, the cross-sectional shape and material are tuned so that the hood edge portions 2L, 2R and the vehicle body 5 are deformed so as to be crushed and a gap 13 is formed.

  The gap 13 serves as a discharge passage for thinly crushing the hollow portion 29 and discharging the air in the engine room 1 onto the fender. That is, the hood bumper 6 provided on the hood 2 contacts the edge of the vehicle body 5 when the hood 2 is closed, so that the hood 2 is maintained at a predetermined height from the upper edge of the engine room 1 of the vehicle body 5. Therefore, when the hollow portion 29 is contracted and thinned, a gap 13 is formed between the hood 2 and the vehicle body 5, and the air in the engine room 1 is discharged onto the fender.

  Next, the operation of the first embodiment will be described. When the vehicle is traveling straight ahead, as shown in FIG. 5, the pressure distribution 14 on the surface of the vehicle may be considered to be substantially bilaterally symmetric, so that it is measured by the pressure sensors 42 and 42 ′ at both ends of the front bumper 41. The pressure difference is small.

  Therefore, the passage of the switching valve 33 is connected to the hose 36 on the intake duct 37 side by the actuator 40 shown in FIG. 2, and the intake duct 37 and the hollow portions 29 of the weather strips 11, 11 ′ on the left and right edges are switched. It communicates via the valve 33. Since the connection position of the hose 36 of the intake duct 37 is closer to the air cleaner 39 than the throttle valve 38, substantially the same pressure as the atmospheric pressure acts on the hollow portions 29 of the weather strips 11, 11 '.

  Therefore, the weather strips 11 and 11 ′ are hardly deformed, and the gap 13 is not generated between the hood edge portions 2 </ b> L and 2 </ b> R and the vehicle body 5. As a result, air does not blow out of the vehicle from the engine room 1 through the gap 13, so that the air flow is reduced without disturbing the attached flow along the surface of the vehicle body.

  Next, when a cross wind is received from the right side of the vehicle in the traveling direction (as viewed from the driver's seat), the pressure value of the right pressure sensor 42 'of the front bumper 41 is high and the left pressure as shown in the pressure distribution of FIG. The pressure value of the sensor 42 becomes low. When this pressure difference is larger than a predetermined value, as shown in FIG. 3, the actuator 40 operates the switching valve 33 to switch between the inside of the vacuum tank 34 and the hollow portions 29 of the weather strips 11, 11 ′ at the left and right edges. It communicates via the valve 33.

  In this case, since the negative pressure of the vacuum tank 34 acts on the hollow portion 29 of the weather strip 11, 11 ', the weather strip 11, 11' is deformed and crushed, and the edges 2L, 2R of the left and right hoods 2 and the vehicle body 5 A gap 13 is formed between the two.

  As described above, when a cross wind is applied, the pressure difference between the engine room 1 and the surface of the fender 20 becomes very large on the leeward side, and therefore, as shown in FIG. Air blows out of the vehicle, and the traveling wind 24 that flows over the hood 1 is directed upward.

  For this reason, as shown in FIG. 7, the flow 24 over the hood 2 and the flow 26 passing through the front of the fender 20 cannot be reattached to the side surface of the left fender 20 and are separated. As a result, the negative pressure of the left fender 20 is reduced, the moment 22 for turning the vehicle body to the left side (leeward side) is reduced, and the crosswind stability is improved.

  In addition, although the above-mentioned explanation explained the operation when receiving a crosswind flowing from the right side to the left side in the traveling direction as viewed from the driver side, the crosswind was received from the left side in the traveling direction as viewed from the driver side. Sometimes the above and the left and right are reversed.

  As described above, in the first embodiment, the gap 13 between the hood 2 and the vehicle body 5 is closed during straight traveling. For this reason, air resistance decreases. When a cross wind is received, a gap 13 between the hood edge 2L and the vehicle body 5 or a gap 13 between the hood edge 2R and the vehicle body 5 is generated, and air in the engine room 1 is discharged onto the leeward fender 20 through the gap 13. . For this reason, the flow 22 along the surface of the leeward fender 20 as shown in FIG. 7B is peeled off as shown in FIG. 4 to suppress the negative pressure and turn to the leeward side 22 (see FIG. 6). Is reduced. Therefore, it is possible to achieve both reduction of air resistance during straight traveling and traveling stability when subjected to cross wind.

  When there is no pressure difference between the left and right pressure sensors 42 and 42 ', one end of the hose 36 is communicated with the intake duct 37. However, if the pressure is close to the atmospheric pressure, it is not necessarily the intake duct 37. It doesn't matter. By connecting to the intake duct 37, dust or the like contained in the outside air is not sucked, and clogging or dirt in the hose can be prevented. Further, the predetermined value for operating the switching valve 33 is appropriately set according to the shape, size, weight, etc. of the vehicle, and is set relatively low for vehicles that are vulnerable to crosswinds such as lightweight vehicles and tall vehicles.

  Next, a second embodiment of the present invention will be described. 8 (a) and 8 (b) show a second embodiment of the present invention. In the second embodiment, weather strips 45, 46, 46 ′, 47 are disposed on the front, rear, left and right edges of the back surface of the hood 2 as compared to the first embodiment. , 46, 46 ′, 47 are fixed to the hood 2 by clips 28 or the like. The hollow portions of the cross sections of the weather strips 46 and 46 ′ at the left and right edge portions are connected to the switching valve 33 as in the first embodiment. Since other configurations are the same as those of the first embodiment, the description thereof is incorporated.

  Moreover, since the effect | action of 2nd Embodiment is the same as the effect | action of 1st Embodiment, the description is used. Since the weather strips 45, 46, 46 'and 47 are disposed on the back surface of the hood 2, when the hood 2 is opened and maintenance is performed in the engine room, oil dripping, tool dropping, etc. There is an advantage that the weather strip can be prevented from being deteriorated and damaged by the above.

  Furthermore, a third embodiment of the present invention will be described. 9 and 10 show a third embodiment of the present invention. In the third embodiment, one ends of hoses 48 and 49 are connected to the hollow portions 29 of the weather strips 11 and 11 ′ at the left and right edge portions fixed to the vehicle body 5, and the other ends of the hoses 48 and 49 are connected to each other. Are connected to a switching device 50 (a switching valve as an example).

  In the third embodiment, the turning control device 100 includes a hood bumper 6 that constitutes a height adjustment member, a hollow portion 29 that constitutes a thickness adjustment portion provided in the weather strips 11 and 11 ′, and a traveling When the pressure detected by the sensors 42 and 42 ′ and the sensors 42 and 42 ′ that detect the air pressure in front of the vehicle body is equal to or greater than a predetermined value, the thickness of the hollow portion 29 is reduced. And a driving device 110 for controlling.

  The driving device 110 of the turning control device 100 includes a switching device 50, hoses 48 and 49 connecting the hollow portion 29 and the switching device 50, a vacuum tank 34 serving as a negative pressure source, a vacuum tank 34, and the switching device 50. , An actuator 40 that controls the switching device 50, and an amplifier 44 that amplifies the detection signals of the sensors 42 and 42 ′.

  One end of a hose 51 is connected to a negative pressure source such as a brake vacuum tank 34 in the engine room 1, and the other end of the hose 51 is connected to a switching device 50. One end of the other hose 52 is connected to the duct 37 on the air cleaner 39 side from the throttle valve 38 of the engine intake duct 37. The other end of the hose 52 is connected to the switching device 50.

  Near both ends of the front bumper 41, pressure sensors 42 and 42 'for detecting the pressure of air received from the front during traveling are attached. The signal lines 43 and 43 ′ of the sensors 42 and 42 ′ are electrically connected to the actuator 40 via the amplifier 44.

  When the pressure difference = (air pressure of the right pressure sensor−air pressure value of the left pressure sensor) is larger than a predetermined value, the program of the actuator 40 is that the passage of the switching device 50 is the vacuum tank 34 and the weather strip at the left edge. 11 hollow portions 29 are configured to communicate with each other.

  When the pressure difference = (the air pressure of the left pressure sensor−the air pressure value of the right pressure sensor) is greater than a predetermined value, the program of the actuator 40 causes the passage of the switching device 50 to pass through the vacuum tank 34 and the right edge portion. The weather strip 11 is configured to communicate with the hollow portion 29.

  The program of the actuator 40 is such that when the absolute value of the pressure difference between the left and right pressure sensors 42, 42 'is smaller than a predetermined value, the intake duct 37 and the hollow portions 29 of both weather strips 11, 11' communicate with each other. Then, the actuator 40 is driven to switch the switching device 50.

  In the third embodiment, when the automobile is traveling straight ahead, the pressure difference measured by the pressure sensors 42 and 42 ′ at both ends of the front bumper 41 (see FIG. 1) is small. Therefore, the passage of the switching device 50 is switched by the actuator 40 so that the intake duct 37 communicates with the hollow portions 29 of the weather strips 11 and 11 ′ at the left and right edge portions.

  Since the connection position of the hose 52 of the intake duct 37 is set closer to the air cleaner 39 than the throttle valve 38, substantially the same pressure as the atmospheric pressure acts on the hollow portion 29 of the weather strips 11, 11 '.

  Therefore, the weather strips 11 and 11 ′ are hardly deformed, and the gap 13 is not formed between the hood edge portions 2 </ b> L and 2 </ b> R and the vehicle body 5. As a result, air does not blow out from the engine room 1 to the outside of the vehicle, so that the attached flow along the surface of the vehicle body is not disturbed, and the air resistance is reduced.

  In the hood structure of the third embodiment, when the automobile is traveling straight, the pressure difference measured by the pressure sensors 42 and 42 ′ at both ends of the front bumper 41 is small.

  Therefore, the actuator 40 causes the switching device 50 to communicate with the air intake duct 37 and the hollow portion 29 of the weather strips 11 and 11 ′ at the left and right edge portions. Since the connection position of the hose 52 of the intake duct 37 is closer to the air cleaner 39 than the throttle valve 38, substantially the same pressure as the atmospheric pressure acts on the hollow portion 29 of the weather strips 11, 11 '.

  Therefore, the weather strips 11 and 11 ′ are hardly deformed, and the gap 13 is not formed between the hood edge portions 2 </ b> L and 2 </ b> R and the vehicle body 5. As a result, air does not blow out of the vehicle from the engine room 1 through the gap 13, so that the air flow is reduced without disturbing the attached flow along the surface of the vehicle body.

  Next, a description will be given of a case where a crosswind is received from the right side of the vehicle in the traveling direction (as viewed from the driver's seat). In this case, as shown by the pressure distribution in FIG. 6, the pressure value of the right pressure sensor 42 ′ of the front bumper 41 is high and the pressure value of the left pressure sensor 42 is low.

  Here, when the pressure difference value (the pressure of the right pressure sensor−the pressure of the left pressure sensor) is larger than a predetermined value, the actuator 40 drives the switching device 50 as shown in FIG. And the hollow portion 29 at the left and right edge portions are communicated with each other. In this case, since the negative pressure of the vacuum tank 34 acts on the hollow portions 29 of the weather strips 11 and 11 ′, the weather strips 11 and 11 ′ are deformed and crushed so as to be thin, and the edge portions 2L and 2L of the left and right hoods 2 A gap 13 is generated between 2R and the vehicle body 5.

  As described above, when a cross wind is applied, the pressure difference between the engine room 1 and the surface of the fender 20 becomes very large on the leeward side, so that the engine room 1 passes through the gap 13 on the leeward side as shown in FIG. Then, air blows out from the vehicle, and the traveling wind 24 that flows over the hood 1 is directed upward.

  For this reason, as shown in FIG. 7B, the flow 24 over the hood 2 and the flow 26 passing through the front of the fender 20 reattach to the side surface of the left fender 20 as shown in FIG. It can't be peeled off. As a result, the negative pressure of the left fender 20 is reduced, the moment 22 (see FIG. 6) for turning the vehicle body to the left side (leeward side) is reduced, and the crosswind stability is improved.

  In addition, although the above-mentioned explanation explained the operation when receiving a crosswind flowing from the right side to the left side in the traveling direction as viewed from the driver side, the crosswind was received from the left side in the traveling direction as viewed from the driver side. Sometimes the above and the left and right are reversed.

  In the third embodiment, the air resistance is reduced because the gap between the hood 2 and the vehicle body 5 is closed during straight traveling. When a crosswind is received, a gap 13 is formed between the edge of the hood 2 on the leeward side and the vehicle body 5, so that air is peeled off from the surface of the fender on the leeward side. The moment to do is reduced. Accordingly, it is possible to achieve both reduction in air resistance during straight traveling and traveling stability when subjected to cross wind. Further, since the wind is sealed on the windward side of the cross wind, there is no air flow between the engine room 1 and the outside of the vehicle, so that the flow along the vehicle body surface is not disturbed and the air resistance can be kept low.

  As described above, in the embodiment of the automobile hood structure of the present invention, the hood structure of the engine room at the front part of the vehicle body has been described. However, the present invention is not limited to these embodiments, and the engine room is located in the middle of the vehicle body. An automobile in which the hood 2 is provided at the front of the vehicle body may be provided at the front part or the rear part. Further, the air discharge passage inside the space closed by the hood 2 is controlled to open and close by the expansion and contraction of the hollow portion 29 such as the weather strips 11 and 11 ′, but the thickness of the weather strips 11 and 11 ′ is changed. Or may be deformed to form the discharge passage.

FIG. 1A is a perspective view of a hood structure for an automobile according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along a line CC in FIG. FIG. 2 is a diagram illustrating a connection state of the switching valve 33 during straight traveling or when the pressure difference is equal to or less than a predetermined value. FIG. 3 is a diagram showing the connection state of the switching valve when the pressure difference between the left and right is greater than or equal to a predetermined value when subjected to cross wind. It is sectional drawing of the state which crushed the hollow part of the weather strip and formed the clearance gap which is an air discharge passage. It is a figure which shows the planar pressure distribution state at the time of straight running. It is a figure which shows the planar pressure distribution state when receiving a crosswind. FIG. 7A is a view showing a state of airflow flowing from above the hood to the fender when subjected to cross wind, and FIG. 7B is a cross-sectional view taken along the line BB of FIG. It is a figure which shows the state which adheres. FIG. 8A is a perspective view showing a connected state of the weather strip and the hose according to the second embodiment. FIG. 8B is a cross-sectional view in the vicinity of the hood end portion and the fender in FIG. FIG. 9 is a view showing a connected state of the weather strip and the hose according to the third embodiment and a state in which the hollow portions of the left and right weather strips are maintained in an atmospheric pressure state. FIG. 10 is a diagram showing a state in which the hollow portion of the left weather strip is crushed to form a discharge passage in the third embodiment. FIG. 11 is a diagram showing a state in which the hollow portion of the right weather strip is crushed to form a discharge passage in the third embodiment.

Explanation of symbols

1 Engine room (equipment space)
2 Hood 5 Body 6 Hood bumper (height adjustment member)
7, 9, 9 ′, 10 Engine compartment edge 11, 11 ′ Left and right weather strips 8, 12 Front and rear weather strips 13 Clearance (discharge passage)
29 Hollow part (thickness adjustment part)
30, 31, 32 Hose 33 Switching valve (switching device)
34 Vacuum tank (negative pressure source)
35, 36 Hose 39 Air cleaner 40 Actuator 41 Front bumper 42, 42 'Pressure sensor (detection unit)
100 turn control device 110 drive device

Claims (7)

  In a hood structure of an automobile comprising a hood for closing a facility space in front of a driver's seat of an automobile and having a weather strip disposed and sealed between the hood and the vehicle body at the periphery of the equipment space, Detects the pressure difference between the air received by the left and right parts, and discharges the air in the equipment space between the lower hood edge and the vehicle body when this pressure difference is greater than or equal to a predetermined value. A hood structure for an automobile, characterized in that a turn control device for opening and closing the passage is provided.   The turning control device detects a pressure adjusting member that maintains a constant distance between the hood and the vehicle body, a thickness adjusting unit provided on the weather strip, and air pressure received by the front left and right parts of the vehicle body during traveling. The automobile according to claim 1, further comprising: a detection unit configured to perform the operation, and a drive device that reduces the thickness of the thickness adjustment unit when the pressure detected by the detection unit is equal to or greater than a predetermined value. Hood structure.   The drive device is configured to form the discharge passage by reducing the thickness of the thickness adjusting portion when the pressure difference of the air received by the detection means at the front left and right parts of the vehicle body is equal to or greater than a predetermined value. The hood structure for an automobile according to claim 2.   The thickness adjusting portion is configured by a hollow portion formed at least on the left and right sides corresponding to the left and right edges of the hood of the weather strip, and the driving device includes a negative pressure source that generates a negative pressure of air; A switching device that applies a negative pressure of the negative pressure source to at least one of the left and right hollow portions, and a thickness of the thickness adjusting portion is reduced when a pressure detected by the detecting portion is a predetermined value or more. 4. The automobile hood structure according to claim 2, wherein the detection unit includes a pressure sensor.   The switching device is connected to the intake duct on the air cleaner side of the throttle valve, and the control means is configured to detect the intake duct and the left and right hollow portions when the pressure difference between the left and right pressure sensors is smaller than a predetermined value. And when the pressure difference between the left and right pressure sensors is larger than a predetermined value, the switching device is controlled to connect the negative pressure source and the hollow portion having the lower pressure. The automobile hood structure according to claim 4. The left and right hollow portions are respectively connected to the switching device by a first hose, and the negative pressure source and the intake duct are connected to the switching device by a second hose,
When the pressure of one of the left and right pressure sensors is greater than the pressure of the other pressure sensor by a predetermined value or more, the control device includes the negative pressure source and a hollow portion on the pressure sensor side having a low pressure. When the pressure of one of the left and right pressure sensors is less than a predetermined value than the pressure of the other pressure sensor, the switching device is configured to connect the intake duct and the left and right hollow portions. The vehicle hood structure according to claim 4, wherein the hood structure is controlled. The automobile hood structure according to any one of claims 1 to 6, wherein the facility space portion is an engine room in a front portion of a vehicle body.

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