JP5488240B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure, and more particularly to a vehicle front structure in which a cooling unit is disposed in the vehicle front.

  In the vehicle front structure, it is desired to effectively apply an air flow during traveling of the vehicle to a radiator for cooling the engine coolant. For example, Patent Document 1 describes a vehicle body front structure in which an air guide member having a wall portion and an impact absorbing portion is provided, and air flowing from the front of the vehicle body is guided to a radiator by the air guide member. .

  By the way, on the air guide member as described in Patent Document 1, foreign matter (pebbles or the like) that has entered from an air inlet or the like in front of the vehicle may accumulate. In order to discharge such foreign matter, for example, it is conceivable to form a discharge port in the air guide member. However, if air escapes from the discharge port, the air is effectively transferred to a cooling unit including a radiator or the like. It becomes impossible to guide.

JP 2004-249816 A

  In view of the above facts, an object of the present invention is to obtain a vehicle front structure capable of effectively guiding air to a cooling unit and discharging foreign matter.

According to the first aspect of the present invention, a cooling unit provided on the vehicle rear side with respect to the air introduction port on the vehicle front side and configured to include an air cooling heat exchanger, and air introduction at the lower end side of the air introduction port. A guide member extending from the opening to the cooling unit and guiding the air introduced from the air introduction port to the cooling unit, and formed on the guide member, foreign matter on the guide member is placed below the guide member. It moves between a discharge port that can be discharged, a closed position that closes the discharge port along the guide member, and an open position that at least partially moves downward from the closed position to open the discharge port. And a valve member that moves the valve member to the closed position when the vehicle speed exceeds a preset threshold vehicle speed, and that allows the valve member to move to the open position below the threshold vehicle speed. .

  In this vehicle front structure, the guide member extends in a plate shape from the air inlet to the cooling unit, and the guide member is formed with a discharge port that is opened and closed by a valve member. When the vehicle speed exceeds a preset threshold vehicle speed, the opening / closing means moves the valve member to the closed position. In the closed position, the valve member closes the discharge port along the guide member, so that air introduced from the air introduction port (hereinafter referred to as “introduction air”) can be prevented from escaping from the discharge port, and the introduced air is cooled. Can guide the unit effectively.

  When the vehicle speed is less than or equal to the threshold vehicle speed, the opening / closing means allows the valve member to move to the open position. Therefore, when the discharge port is opened, even if foreign matter has accumulated on the guide member, Can be discharged downward.

  As described above, in the present invention, when the vehicle speed exceeds the threshold vehicle speed (for example, while the vehicle is traveling), the introduced air introduced from the air introduction port can be effectively guided to the cooling unit, and the vehicle speed is equal to or less than the threshold vehicle speed. Then (for example, when the vehicle is stopped), it becomes possible to discharge the foreign matter on the guide member through the discharge port.

  Note that the “cooling unit” in the present invention includes an air-cooled heat exchanger such as a radiator that cools engine cooling water by releasing heat, and further includes, for example, a condenser and a fan disposed in the vicinity of the air-cooled heat exchanger. Further, a radiator support lower for supporting an air-cooled heat exchanger such as a radiator or the like is also included. That is, if the air introduced from the air inlet is guided to these members by the guide member, the air volume hitting the cooling unit will increase as a result, so that the cooling unit is more effective than the configuration without the guide member. It is possible to cool by dissipating heat.

  According to a second aspect of the present invention, in the first aspect of the present invention, the shock absorbing member is provided below the air inlet and absorbs an impact acting on a vehicle, and a part of the shock absorbing member. Also serves as the guide member.

  As described above, the configuration in which a part of the impact absorbing member also serves as the guide member can reduce the number of parts and reduce the weight of the vehicle front structure as compared with the configuration in which the guide member is provided separately from the impact absorbing member. Can contribute to the improvement and simplification.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the valve member has a flow velocity difference between a flow velocity of air above the discharge port and a flow velocity of air below the discharge port. When the pressure exceeds a predetermined value, it rises due to the pressure difference generated above and below the discharge port and closes the discharge port. And the opening / closing means is a cover member that closes a space below the discharge port by covering at least a portion below the discharge port.

  The cover member covers the lower part of the discharge port and closes the space below the discharge port. When the vehicle speed exceeds the threshold vehicle speed, the flow rate of the air below the discharge port becomes the flow rate of the air above the discharge port. Lower than. When this flow velocity difference exceeds a predetermined value, the opening / closing plate rises due to the pressure difference generated above and below the discharge port and closes the discharge port. That is, when the vehicle speed exceeds the threshold vehicle speed (for example, while the vehicle is running), the discharge port is closed by the opening / closing plate. On the other hand, when the vehicle speed is less than or equal to the threshold vehicle speed (for example, when the vehicle is stopped), the difference in air flow rate between the upper side and the lower side of the guide member is zero (predetermined or lower). Become. That is, the opening / closing plate moves downward under its own weight, and opens the discharge port.

  In this way, the discharge port can be opened and closed with a simple structure in which only the opening / closing plate and the cover member are provided.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the guide member is erected from the guide member on both sides in the vehicle width direction, and the guide member is A wall member that suppresses the outflow of the upper air to the outside in the vehicle width direction.

  That is, the wall member can suppress the air on the upper side of the guide member during vehicle travel from flowing out to the vehicle width direction outside. For this reason, it becomes possible to send introduction air to a cooling unit more effectively.

  It is also possible to stably maintain the state in which the opening / closing plate closes the discharge port by increasing the flow velocity difference between the upper side and the lower side of the guide member while the vehicle is running.

  According to a fifth aspect of the invention, there is provided the rotary support member according to the third or fourth aspect, wherein the open / close plate is rotatably supported with respect to the guide member.

  Thus, the structure which opens and closes a discharge port with an opening-and-closing plate is realizable with the simple structure which supports an opening-and-closing plate with respect to a guide member rotatably by a rotation support member. For example, the outlet can be opened and closed efficiently and stably compared to a structure in which the opening and closing plate slides up and down to open and close the outlet.

  In the invention according to claim 6, in the invention according to any one of claims 1 to 5, at least a part of the upper surface of the guide member is an inclined surface inclined with respect to a horizontal plane, and the discharge port Is formed below the inclined surface.

  Accordingly, the foreign matter on the inclined surface moves to the lower portion of the inclined surface by its own weight. Since the discharge port is formed in the lower part of the inclined surface, foreign matter can be efficiently discharged from the discharge port.

  Since the present invention has the above-described configuration, it is possible to effectively guide the air introduced from the air inlet to the cooling unit, and to obtain a vehicle front structure that can discharge foreign matters.

It is a perspective view showing the appearance shape of the vehicle to which the vehicle front part structure of the present invention is applied. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 showing the vehicle front structure according to the first embodiment of the present invention. It is sectional drawing which expands and shows the vehicle front part structure of 1st Embodiment of this invention. It is a partially broken perspective view which expands and shows the vehicle front part structure of a 1st embodiment of the present invention. It is sectional drawing which expands and shows the vehicle front part structure of the modification of 1st Embodiment of this invention. It is a partially broken perspective view which expands and shows the vehicle front part structure of 2nd Embodiment of this invention. It is a partially broken perspective view which expands and shows the vehicle front part structure of 3rd Embodiment of this invention. It is a partially broken perspective view which expands and shows the vehicle front part structure of 4th Embodiment of this invention. It is a partially broken perspective view which expands and shows the vehicle front part structure of 5th Embodiment of this invention. FIG. 10A is a partially cutaway perspective view showing an enlarged vehicle front structure according to the sixth embodiment of the present invention, and FIG. 10B is an enlarged view showing the vehicle front structure according to the sixth embodiment. It is BB sectional drawing of (A). It is sectional drawing which expands and shows the vehicle front part structure of 7th Embodiment of this invention. It is sectional drawing which expands and shows the vehicle front part structure of 8th Embodiment of this invention.

  FIG. 1 shows a vehicle 10 to which a vehicle front structure 12 according to a first embodiment of the present invention is applied. Further, FIG. 2 shows the vehicle front structure 12 in a section taken along line 2-2 in FIG. In the drawings, the front side of the vehicle 10 is indicated by an arrow FR, the outer side in the vehicle width direction is indicated by an arrow OUT, and the upper side is indicated by an arrow UP.

  As shown in FIG. 2, a lower portion of the hood 14 of the vehicle 10 is an engine room 16 in which an engine (not shown), a cooling unit 28 described later, and the like are mounted. An air inlet 20 is formed in the bumper cover 18 at the front portion of the vehicle 10 (below the hood 14). In the present embodiment, in particular, an example in which two upper and lower air inlets 20A and 20B are formed is described, but one air inlet 20 may be provided. Further, a front grill 22 is attached to the air inlet 20. The front grill 22 constitutes the external shape of the front portion of the vehicle 10 and suppresses foreign matter from entering from the air inlet 20.

  An upper absorber 24 and a reinforcement 26 are disposed behind the bumper cover 18 between the upper air inlet 20A and the lower air inlet 20B. Below the air inlet 20, the bumper cover 18 is bulged toward the front of the vehicle, and a bulging portion 18B is configured.

  The vehicle 10 has a cooling unit 28 disposed behind the air inlet 20. The cooling unit 28 is a radiator body (air-cooled heat exchanger) for releasing the heat of the engine cooling water by the traveling wind (hereinafter referred to as “introducing air”) introduced from the air inlet 20 during traveling of the vehicle. In addition, a fan shroud for guiding the introduced air to the radiator main body, a condenser for cooling the refrigerant sent from a compressor (not shown), and condensing and liquefying are included. Further, the radiator main body, the fan shroud, the condenser, and the like are supported by the radiator support and attached to the vehicle body (in FIG. 2 and FIG. 3, only the radiator support lower 30 is shown). The radiator support lower 30 is also an example of members constituting the cooling unit 28 of the present invention, like the radiator main body, the fan shroud, the condenser, and the like.

  As shown in detail in FIG. 3, below the lower air inlet 20B, the vehicle width extends from the rear of the bumper cover 18 (inside the bulging portion 18B) to the front of the radiator support lower 30. A lower absorber 32 having a predetermined width (for example, preferably about the same width as the cooling unit 28) is disposed in the direction.

  The lower absorber 32 of the present embodiment is formed in a plate shape and extends from the air inlet 20B to the cooling unit 28, and a rectangular frame-like frame extending downward from the periphery of the upper plate 34. A plate 36 is provided. Further, a plurality of (three in FIG. 3) ribs 38 extending in the vehicle width direction are formed inside the frame plate 36. The lower absorber 32 is deformed when an impact is applied from the front of the vehicle, and has an action of absorbing the impact.

  In the present embodiment, the upper plate 34 of the lower absorber 32 is substantially horizontal (parallel to the road surface, see the horizontal plane LS), and also serves as the guide member 40 according to the present invention. That is, the upper plate 34 is disposed on the lower end side of the air introduction port 20B, and has a function of guiding the traveling wind (introduction air) introduced from the air introduction port 20B to the cooling unit 28 when the vehicle is traveling. Yes.

  As shown in detail in FIG. 4, from both sides in the vehicle width direction of the upper plate 34 of the lower absorber 32 (only the right side in the vehicle width direction is shown in FIG. 4, but the left side in the vehicle width direction is also symmetrical), Side plates 42 are erected. The side plate 42 is erected so as to be continuous from the upper plate 34 without a gap. And it has the effect | action which suppresses escape of introduction air to the vehicle width direction outer side, and sends introduction air to the cooling unit 28 efficiently.

  Below the lower absorber 32, an engine under cover 44 that is continuous from the lower end of the bumper cover 18 to the radiator support lower 30 is disposed. The engine under cover 44 covers the lower part of the lower absorber 32 (essentially, a discharge port 46 to be described later), and suppresses the invasion of traveling wind to the lower side of the upper plate 34 of the lower absorber 32 when the vehicle is traveling. doing.

  Here, as shown in FIG. 3, the air speed (flow velocity) on the vehicle outer side (vehicle front side and vehicle lower side) is V1, and the speed of the introduced air above the upper plate 34 of the lower absorber 32 ( The flow velocity) is V2, and the velocity (flow velocity) of the introduced air below the upper plate 34 of the lower absorber 32 is V3. A state in which the vehicle speed exceeds a preset threshold vehicle speed (hereinafter, this state is referred to as “the vehicle is traveling”) is V1≈V2, and the speed of the introduced air above the upper plate 34 is V2. Although the air flow velocity V1 on the outside of the vehicle is substantially the same as the flow velocity V1, the flow velocity of the air flow on the lower side of the upper plate 34 is a region surrounded by the upper plate 34 and the engine under cover 44 (closed space). ), V3≈0. In summary, the relationship of V1≈V2> V3≈0 is established.

  A discharge port 46 penetrating in the vertical direction is formed in the upper plate 34 of the lower absorber 32. The discharge port 46 is formed in such a size that foreign matter such as pebbles entering from the air introduction port 20 can be discharged downward even when foreign matter such as pebbles accumulates on the upper plate 34. In the present embodiment, the upper plate 34 is substantially horizontal, and the foreign matter is formed in the vicinity of the rear side 34R of the upper plate 34 in consideration of the high possibility of moving to the vehicle rear side. Further, the shape of the discharge port 46 is not particularly limited, but in the present embodiment, it is a quadrangular shape.

  An opening / closing plate 48 is rotatably attached to the upper plate 34 of the lower absorber 32 by a hinge 50 which is a rotation support member provided at the front edge portion of the discharge port 46. The opening / closing plate 48 has a shape sufficient to fit into the discharge port 46 and close the discharge port 46, and as shown by a solid line in FIGS. 2 and 3, as indicated by a two-dot chain line, it is rotatable (movable) between a closed position where the discharge port 46 is closed. When the open / close plate 48 is in the closed position, the upper surface thereof is substantially flush with the upper surface of the upper plate 34.

When the pressure difference between the upper and lower sides of the discharge port 46 does not occur (or when the pressure difference is not more than a predetermined value), the opening / closing plate 48 has a hinge 50 as shown by a solid line in FIGS. It rotates downward by its own weight as the center, and the discharge port 46 is opened.

  On the other hand, when the vehicle travels, as described above, between the flow velocity V2 of the introduced air above the upper plate 34 and the flow velocity V3 of the air below the upper plate 34 of the lower absorber 32, V2> The relationship of V3 is established. If the flow rate difference exceeds a predetermined value, the opening / closing plate 48 receives an upward force due to the pressure difference generated above and below the upper plate 34 (discharge port 46). As indicated by the dotted line, the discharge port 46 is closed by rotating upward about the hinge 50. The upper plate 34 or the opening / closing plate 48 is provided with a stopper (not shown) so that the opening / closing plate 48 does not move (rotate) further from the state where the discharge port 46 is closed. Therefore, when the opening / closing plate 48 is in the closed position, the state where the upper surface of the upper plate 34 and the upper surface of the opening / closing plate 48 are substantially flush with each other is maintained.

  The shape of the opening / closing plate 48 is only required to maintain the closed state of the discharge port 46 by having a predetermined rigidity. In this embodiment, the opening / closing plate 48 is made of the same material as the lower absorber 32.

  Next, the operation of the vehicle front structure 12 according to this embodiment will be described.

  While the vehicle is running, between the flow velocity V2 of the introduced air above the upper plate 34 of the lower absorber 32 and the flow velocity V3 of the introduced air below the upper plate 34 of the lower absorber 32, as described above, V2 The relationship> V3 is established. When this flow velocity difference (V2-V3) exceeds a predetermined value, the pressure difference between the upper side and the lower side of the upper plate 34 (discharge port 46) also exceeds the predetermined value. At this time, as indicated by a two-dot chain line in FIGS. 2 and 3, the opening / closing plate 48 receives an upward force and closes the discharge port 46 by rotating upward about the hinge 50.

  Therefore, in this state, the upper surface of the upper plate 34 is substantially flush including the portion where the discharge port 46 is formed, that is, is flat, and the introduced air introduced from the air inlet 20 is It does not flow downward from the discharge port 46. For this reason, compared with the structure in which the discharge port 46 is not blocked, the introduced air can be efficiently sent to the cooling unit 28.

  Further, in the vehicle front structure 12 of the present embodiment, as shown in FIG. 4, side plates 42 are erected from both sides in the vehicle width direction of the upper plate 34 of the lower absorber 32 and are introduced from the air introduction port 20. The introduced air is prevented from flowing outward in the vehicle width direction. For this reason, compared with the structure which guides introduction air with the upper board 34 (guide member 40) which does not have the side plate 42, it becomes possible to send introduction air to the cooling unit 28 more reliably. In addition, since the flow velocity V2 of the introduced air above the upper plate 34 is further increased compared to the structure without the side plate 42, even when the vehicle speed is relatively low, Thus, the state in which the opening / closing plate 48 closes the discharge port 46 can be reliably maintained.

  In a state where the vehicle speed is equal to or less than the above threshold vehicle speed (this is referred to as “the vehicle is stopped”), the flow velocity V2 of the introduced air above the upper plate 34 of the lower absorber 32 and the lower plate 34 of the lower absorber 32 are below. Since the flow velocity V3 of the introduced air is zero (or close to zero), the pressure difference between the upper side and the lower side of the discharge port 46 is also zero. Therefore, as indicated by solid lines in FIGS. 2 and 3, the opening / closing plate 48 rotates downward under its own weight around the hinge 50, and opens the discharge port 46. Thereby, for example, when the vehicle is stopped, foreign matter such as pebbles entering the air inlet 20 and collecting on the upper surface of the upper plate 34 can be discharged from the outlet 46.

  In particular, in the present embodiment, since the upper surface of the upper plate 34 of the lower absorber 32 is substantially horizontal, there is a high possibility that foreign matter moves to the rear of the upper plate 34 while the vehicle is traveling. Since the discharge port 46 is formed on the vehicle rear side of the upper plate 34, foreign matter can be easily discharged as compared with a configuration in which the discharge port 46 is formed on the vehicle front side. Even when the vehicle is not completely stopped, if the difference between the flow velocities V2 and V3 is substantially small, the pressure difference between the upper and lower portions of the upper plate 34 is within a predetermined range. Therefore, the opening / closing plate 48 opens the discharge port 46.

  FIG. 5 shows a vehicle front structure 72 according to a modification of the first embodiment of the present invention. In the vehicle front structure 72 of this modification, a contact piece 74 is formed at a position on the vehicle rear side of the discharge port 46 on the lower surface of the upper plate 34 of the lower absorber 32. As shown by a two-dot chain line in FIG. 5, the contact piece 74 is in contact with the rear side 48 </ b> R (the side opposite to the hinge 50) with the opening / closing plate 48 closing the discharge port 46 ( In other words, inadvertent vertical movement (flapping) of the opening / closing plate 48 is suppressed. However, when the pressure difference between the upper and lower sides of the upper plate 34 becomes equal to or less than a predetermined value while the vehicle is stopped, the operation of the opening / closing plate 48 rotating downward by its own weight is not hindered.

  Therefore, in the vehicle front structure 72 according to the modified example of the first embodiment, inadvertent vertical movement (flapping) of the opening / closing plate 48 with the opening / closing plate 48 closing the discharge port 46 is suppressed, and the introduced air Can be guided to the cooling unit 28 more stably.

  As shown in the following embodiments, the specific configuration for rotatably supporting the opening / closing plate 48 on the upper plate 34 of the lower absorber 32 is not particularly limited. Further, the valve member of the present invention is not limited to the opening / closing plate 48 described above.

  FIG. 6 shows a partially enlarged view of a vehicle front structure 112 according to the second embodiment of the present invention. In the second embodiment, the position of the hinge 50 that rotatably supports the opening / closing plate 48 with respect to the upper plate 34 is different from that of the vehicle front structure 12 of the first embodiment. That is, in the second embodiment, the hinge 50 is provided on the outer side in the vehicle width direction of the discharge port 46.

  FIG. 7 shows a partially enlarged vehicle front structure 122 according to a third embodiment of the present invention. In the third embodiment, the discharge port 46 is opened and closed by two divided opening / closing plates 124A and 124B divided in the vehicle width direction right and left. The split opening / closing plate 124A on the outer side in the vehicle width direction is rotatably supported by the upper plate 34 by a hinge 50 on the outer side in the vehicle width direction, and the split opening / closing plate 124B on the inner side in the vehicle width direction is supported by the hinge 50 on the inner side in the vehicle width direction. The upper plate 34 is rotatably supported.

  FIG. 8 shows a partially enlarged view of a vehicle front structure 132 according to a fourth embodiment of the present invention. In the fourth embodiment, the outlet 46 is opened and closed by four triangular opening / closing plates 134A, 134B, 134C, and 134D. The split opening / closing plate 134A on the outer side in the vehicle width direction is rotatably supported by the hinge 50 on the outer side in the vehicle width direction, and the split opening / closing plate 134B on the inner side in the vehicle width direction is supported by the hinge 50 on the inner side in the vehicle width direction. The upper plate 34 is rotatably supported. Further, the split opening / closing plate 134C on the front side of the vehicle is rotatably supported by the upper plate 34 by a hinge 50 on the front side of the vehicle, and the split opening / closing plate 134D on the rear side of the vehicle can be rotated by a hinge 50 on the rear side of the vehicle. Are supported by the upper plate 34.

  FIG. 9A shows a partially enlarged vehicle front structure 142 according to a fifth embodiment of the present invention. Further, FIG. 9B shows the vehicle front structure 142 further enlarged in the cross section taken along line BB in FIG. 9A.

  In the fifth embodiment, the opening / closing plate 144 is configured by an elastic plate-like member (resin, rubber, or the like), and is fixed to the upper plate 34 (adhesion, welding, or the like) on the vehicle front side of the discharge port 46. The method is not particularly limited). Similarly to the opening / closing plate 48 according to the first embodiment, the opening / closing plate 144 is indicated by a solid line in FIG. 9B when the pressure difference due to the flow velocity difference between the upper and lower sides of the discharge port 46 is within a predetermined range. As described above, the corner 34C of the upper plate 34 is rotated as a substantial hinge, and is bent downward by its own weight as a whole to open the discharge port 46. When this pressure difference exceeds a predetermined range, the vehicle rear side is deformed upward as shown by a two-dot chain line in FIG.

  FIG. 10 shows a partially enlarged vehicle front structure 152 according to the sixth embodiment of the present invention. In the sixth embodiment, a circular discharge port 154 is formed in the upper plate 34 of the lower absorber 32. The opening / closing plate 156 includes a plurality of fan-shaped opening / closing fan plates 156 </ b> S that form a circular shape that can block the discharge port 154 as a whole. Each of the open / close fan plates 156S, like the open / close plate 144 according to the fifth embodiment, curves downward under its own weight when the pressure difference due to the flow velocity difference between the upper and lower sides of the discharge port 46 is within a predetermined range. . At this time, the radius portions 156R of the adjacent opening / closing fan plates 156S are separated from each other, and the discharge port 154 is opened. When the pressure difference exceeds a predetermined range, the rear side of the vehicle is deformed upward, and the radial portions 156R of the adjacent open / close fan plates 156S come into contact with each other to close the discharge port 154.

  Thus, in any of the above-described embodiments, the discharge port 46 (or the discharge port 154) can be closed while the vehicle is running and opened when the vehicle is stopped by using the opening / closing plate that is a valve member. is there. When the vehicle is traveling, the opening / closing plate 48 closes the discharge port 46, so that the introduced air can be efficiently sent to the cooling unit 28, and when the vehicle is stopped (when the vehicle speed is low), the opening / closing plate 48 is used. By opening the discharge port 46, it becomes possible to discharge the foreign matter accumulated on the upper plate 34 from the discharge port 46.

  In addition, in the configuration of each embodiment described above, a special member or structure for moving the opening / closing plate 48 to open and close the discharge ports 46 and 154 becomes unnecessary, and the configuration of the vehicle front structure can be simplified. it can. Of course, as a configuration for moving the opening and closing plate 48 to open and close the discharge ports 46 and 154, it is possible to use a configuration other than the above-described embodiments. For example, an actuator for moving the opening / closing plate may be provided, and the opening / closing plate may be moved by driving the actuator according to the vehicle speed. In the configuration using the actuator as described above, it is possible to support the opening / closing plate 48 and to move it to the open position by applying a force in contact, but it is possible to open / close only by releasing the support of the opening / closing plate 48. The plate 48 is free and can be moved to the closed position. Therefore, as in the above embodiments, the opening / closing plate 48 can be moved to the open position by its own weight.

Further, in the configuration using the actuator, instead of the structure in which the opening / closing plate is rotated by the hinge 50, a configuration in which the opening / closing plate is opened / closed by moving (sliding) the opening / closing plate vertically or horizontally can be realized. (The example of moving the open / close plate in the horizontal direction is a reference example) . In the configuration using the actuator, the flow velocity difference (V2−V3) between the flow velocity V2 of the introduced air above the upper plate 34 of the lower absorber 32 and the flow velocity V3 of the introduced air below the upper plate 34 of the lower absorber 32. ), There is less restriction on the structure of the engine under cover 44.

  In each of the above embodiments, the upper plate 34 of the lower absorber 32 is taken as an example. However, as shown in the following embodiments, all or part of the upper plate 34 is inclined. It may be a structure. Thus, in the structure where all or part of the upper plate 34 is inclined, if the discharge ports 46 and 154 are provided at a position where the height of the upper plate 34 in the horizontal direction is low, the upper plate 34 can be placed at any other height position. As compared with the case where the discharge port is formed, the foreign matter can be effectively discharged.

  In the vehicle front portion structure 162 of the seventh embodiment shown in FIG. 11, the upper plate 34 of the lower absorber 32 is entirely inclined so that the vehicle rear side is downward. Therefore, the discharge port 46 is also formed on the vehicle rear side.

  In the vehicle front portion structure 172 of the eighth embodiment shown in FIG. 12, the upper plate 34 of the lower absorber 32 is entirely inclined so that the front side of the vehicle faces downward. Therefore, the discharge port 46 is also formed on the vehicle rear side.

  In addition to the configurations of the seventh and eighth embodiments, for example, the present invention can be applied to a configuration in which an intermediate portion in the vehicle front-rear direction is convex or concave upward. Further, in the structure in which the upper plate 34 of the lower absorber 32 is inclined as in the seventh embodiment or the eighth embodiment, the configuration of the opening / closing plate or the discharge port of the second to sixth embodiments is adopted. Is also possible.

  In each of the above-described embodiments, the guide member of the present invention is exemplified as one configured as the upper plate 34 of the lower absorber 32. That is, the upper plate 34 of the lower absorber 32 is used as a guide member, and it is not necessary to newly provide the guide member. Therefore, the number of parts can be reduced, and the vehicle front structure can be reduced in weight and simplified. it can. However, the guide member of the present invention may be configured separately from the upper plate 34 of the lower absorber 32. The lower side 22B (see FIG. 3) of the front grille 22 and the upper portion 18T (also see FIG. 3) of the bulging portion 18B of the bumper cover 18 are extended in a plate shape to the vehicle rear side, and this extended portion is used as a guide member of the present invention. It may be used as

  As the cover member of the present invention, the configuration in which the engine under cover 44 also serves as the above has been described. However, a cover member may be newly provided to generate the above-described flow velocity difference (V2-V3). Good.

DESCRIPTION OF SYMBOLS 10 Vehicle 12 Vehicle front part structure 20 Air inlet 22 Front grill 28 Cooling unit 30 Radiator support lower 32 Lower absorber 40 Guide member 42 Side plate (wall member)
44 Engine under cover (cover member, opening / closing means)
46 Discharge port 48 Opening and closing plate (valve member)
50 Hinge (Rotating support member)
72 Vehicle front structure 74 Contact piece 112 Vehicle front structure 122 Vehicle front structure 124A, 124B Divided opening / closing plate (valve member)
132 Vehicle front structure 134A, 134B, 134C, 134D Split opening / closing plate (valve member)
142 Vehicle Front Structure 144 Opening and Closing Plate (Valve Member)
152 Vehicle front structure 154 Discharge port 156 Opening / closing plate (valve member)
162 Vehicle front structure 172 Vehicle front structure

Claims (6)

A cooling unit that is provided on the vehicle rear side of the air inlet on the vehicle front side and includes an air-cooled heat exchanger;
A guide member extending in a plate shape from the air inlet to the cooling unit on the lower end side of the air inlet, and guiding the air introduced from the air inlet to the cooling unit;
A discharge port formed in the guide member and capable of discharging foreign matter on the guide member to the lower side of the guide member;
A valve member movable between a closed position where the discharge port is closed along the guide member, and an open position where at least a part of the discharge port moves downward from the closed position to open the discharge port ;
Opening and closing means for moving the valve member to the closed position when the vehicle speed exceeds a preset threshold vehicle speed, and allowing the valve member to move to the open position below the threshold vehicle speed;
A vehicle front structure having: An impact absorbing member that is provided below the air inlet and absorbs an impact acting on the vehicle;
Have
The vehicle front part structure according to claim 1, wherein a part of the impact absorbing member also serves as the guide member. The valve member is
If the flow rate difference between the air flow rate above the discharge port and the air flow rate below the discharge port exceeds a predetermined value, the flow rate rises due to the pressure difference generated above and below the discharge port and closes the discharge port. Is an opening / closing plate that can move downward by its own weight when the weight is less than or equal to a predetermined weight and open the discharge port,
The vehicle front part structure according to claim 1 or 2, wherein the opening / closing means is a cover member that closes a space below the discharge port by covering at least the lower part of the discharge port. A wall member that is erected from the guide member on both sides in the vehicle width direction of the guide member, and suppresses the outflow of the air above the guide member to the outside in the vehicle width direction when the vehicle is running;
The vehicle front part structure according to claim 3, comprising:   The vehicle front structure according to claim 3, further comprising a rotation support member that rotatably supports the opening / closing plate with respect to the guide member. At least a part of the upper surface of the guide member is an inclined surface inclined with respect to a horizontal plane;
The vehicle front part structure according to any one of claims 1 to 5, wherein the discharge port is formed in a lower portion of the inclined surface.

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