JP2015140081A - Vehicle body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To introduce cooling air efficiently to a radiator.SOLUTION: A vehicle body front structure 10 comprises: a bottom part introduction port 28 disposed on a lower side of a radiator 62 in a vehicle body front direction, and introducing cooling air to the radiator 62; an outlet 54 disposed on a vehicle body lower side between the radiator 62 and a fan 64, and discharging the cooling air which has passed the radiator 62; a front part flap 70 disposed on a rear end part side of the bottom part introduction port 28, and selectively changing its posture between a projecting posture projecting toward the vehicle body lower side, and a storage posture projecting toward a vehicle body front side; a rear part flap 80 disposed on a front end part side of the outlet 54, and selectively changing its posture between a closure posture projecting toward the vehicle body rear side, and an open posture projecting toward the vehicle body lower side; and a linkage mechanism 90 for linking the rear part flap 80 and front part flap 70, so that when the rear part flap 80 is in the closure posture, the front part flap 70 is in the projecting posture, and when the rear part flap 80 is in the open posture, the front part flap 70 is in the storage posture.

Description

  The present invention relates to a vehicle body front part structure in which a cooling unit including a radiator and a fan is disposed on the vehicle body rear side of a power unit.

  A vehicle body front structure in which a cooling unit including a radiator and a fan is disposed on the vehicle body rear side of the engine compartment room, that is, on the vehicle body rear side of the power unit, has been conventionally known (see, for example, Patent Document 1). In this vehicle body front structure, a bottom introduction port for introducing cooling air into the radiator is formed, and a flap for facilitating introduction of cooling air is formed at the rear end of the bottom introduction port toward the lower side of the vehicle body. Projected toward.

JP 2013-107469 A

  However, when the vehicle is traveling at high speed, the cooling air introduced from the front inlet formed in the front of the vehicle body is larger than the cooling air introduced from the bottom inlet, so the cooling air is introduced into the bottom inlet. On the contrary, there is a possibility that the flap for facilitating making it become wind guide resistance. Thus, there is room for improvement in the structure for efficiently introducing the cooling air into the radiator.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to obtain a vehicle body front structure in which cooling air can be efficiently introduced into a radiator.

  In order to achieve the above object, a vehicle body front structure according to claim 1 of the present invention is disposed at least on the vehicle body rear side of a power unit that drives at least a front wheel, and a radiator that constitutes a cooling system for the power unit; A fan that is disposed on the rear side of the vehicle body relative to the radiator and that introduces cooling air to the radiator, and a bottom inlet that is provided on the lower front side of the vehicle body than the radiator and that introduces cooling air to the radiator And provided on the lower side of the vehicle body between the radiator and the fan, provided on the rear end side of the bottom introduction port, and a discharge port for discharging the cooling air that has passed through the radiator to the outside of the vehicle. A front flap that selectively takes a protruding posture protruding to the side and a retracted posture protruding to the front side of the vehicle body, and provided on the front end side of the discharge port, A rear flap that selectively takes a closed posture and an open posture that protrudes downward from the vehicle body, and the front flap takes a projecting posture and the rear flap takes an open posture when the rear flap takes the closed posture. And an interlocking mechanism for interlocking the rear flap and the front flap so that the front flap sometimes takes a retracted posture.

  According to the first aspect of the present invention, the front flap is provided on the rear end portion side of the bottom introduction port so as to selectively take the protruding posture protruding toward the vehicle body lower side and the retracted posture protruding toward the vehicle body front side. A rear flap is provided on the front end side of the discharge port so as to selectively take a closed posture protruding toward the rear side of the vehicle body and an open posture protruding toward the lower side of the vehicle body. The rear flap and the front flap are interlocked so that the front flap takes a protruding posture when the rear flap takes a closed posture and the front flap takes a retracted posture when the rear flap takes an open posture. It is linked by.

  Therefore, when the vehicle speed is less than the predetermined value, the cooling air is efficiently introduced from the bottom inlet by rotating the fan with the rear flap in the closed posture and the front flap in the protruding posture. Thereby, the cooling air is efficiently introduced into the radiator. Further, when the vehicle speed is equal to or higher than a predetermined value, the rear flap is set to the open posture, the front flap is set to the retracted posture, and the rotational drive of the fan is stopped, so that the front introduction port provided on the front side of the vehicle body from the power unit The cooling air that has been introduced and passed through the radiator is discharged out of the vehicle through the discharge port (sucked out of the vehicle by negative pressure). Thereby, the cooling air is efficiently introduced into the radiator.

  The vehicle body front structure according to claim 2 is the vehicle body front structure according to claim 1, wherein the rear flap takes a closed posture when the vehicle speed is less than a predetermined value, and the vehicle speed is equal to or higher than a predetermined value. A control device for controlling the interlocking mechanism so that the rear flap takes an open posture at the time of

  According to the second aspect of the present invention, the interlock mechanism controls the control device so that the rear flap takes the closed posture when the vehicle speed is less than the predetermined value and the rear flap takes the open posture when the vehicle speed is equal to or higher than the predetermined value. Is controlled by. Therefore, the cooling air is efficiently introduced into the radiator automatically in accordance with the vehicle speed.

  Further, the vehicle body front structure according to claim 3 is the vehicle body front structure according to claim 2, wherein the interlocking mechanism has one axial end of a front rotation shaft to which the front flap is attached. A front gear fixed to a part, a rear gear fixed to one axial end of a rear rotating shaft to which the rear flap is attached, and a drive motor whose rotation in both forward and reverse directions is controlled by the control device And a belt-like member wound around the front gear, the rear gear, and the drive gear.

  According to the third aspect of the present invention, the posture of the front flap and the rear flap is switched by controlling the rotation of the drive motor in the forward direction or the reverse direction by the control device. That is, the interlocking mechanism controlled by the control device is simply configured.

  The vehicle body front part structure according to claim 4 is the vehicle body front part structure according to claim 2 or claim 3, wherein the control device is configured such that when the rear flap takes an open posture, It is set as the structure which stops the rotational drive of a fan.

  According to the fourth aspect of the present invention, when the rear flap is in the open posture, the rotation of the fan is stopped by the control device. Therefore, the cooling air is not taken in from the discharge port by the rotational drive of the fan. Therefore, the cooling efficiency for the radiator is not reduced.

  As described above, according to the first aspect of the present invention, the cooling air can be efficiently introduced into the radiator.

  According to the invention which concerns on Claim 2, a cooling wind can be efficiently efficiently introduced with respect to a radiator according to a vehicle speed.

  According to the invention which concerns on Claim 3, the interlocking mechanism controlled by the control apparatus can be comprised simply.

  According to the invention of claim 4, it is possible to prevent the cooling efficiency of the radiator from being lowered.

1 is a perspective view showing a vehicle to which a vehicle body front structure according to an embodiment is applied. FIG. 2 is a cross-sectional view taken along line XX in FIG. 1. It is a bottom view which shows the state at the time of low speed driving | running | working of the vehicle body front part structure which concerns on this embodiment. It is a bottom view which shows the state at the time of high speed driving | running | working of the vehicle body front part structure which concerns on this embodiment. It is a disassembled perspective view which shows the vehicle body front part structure which concerns on this embodiment. It is a front view which shows the vehicle body front part structure which concerns on this embodiment. It is an enlarged side view showing the state at the time of low-speed running of the body front part structure concerning this embodiment. It is an enlarged side view showing the state at the time of high-speed running of the body front part structure concerning this embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each figure is a vehicle body upward direction, an arrow FR is a vehicle body front direction, an arrow RH is a vehicle body right direction, and an arrow LH is a vehicle body left direction. Further, in the following description, when using the up / down, front / rear, and left / right directions, the vertical direction of the vehicle body, the front / rear direction of the vehicle body direction, and the left / right direction of the vehicle body (vehicle width direction) are indicated.

  As shown in FIG. 2, a pair of left and right sides extending in the longitudinal direction of the vehicle body are respectively provided on the vehicle body right side portion and vehicle body left side portion (vehicle body side portions) of the vehicle 12 to which the vehicle body front structure 10 according to the present embodiment is applied. The front side member 14 is arranged. Each front side member 14 is formed in a rectangular frame-shaped closed cross-sectional structure, and has an inclined portion (kick portion: not shown) at a midway portion in the longitudinal direction of the vehicle body.

  Thus, each front side member 14 extends in the front-rear direction of the vehicle body at a position where the front side of the vehicle body is higher than the inclined portion by a predetermined height than the rear side of the vehicle body. In addition, a front bumper reinforcement 16 that is formed in a rectangular frame-like closed cross-sectional structure and extends in the vehicle width direction is installed at the front ends of the pair of left and right front side members 14.

  As shown in FIGS. 1 and 2, a front bumper 18 made of resin is disposed on the front side of the vehicle body of the front bumper reinforcement 16, and the front bumper 18 is disposed on the lower side of the vehicle body of the front bumper 18. A resin bumper cover 19 is disposed integrally therewith. And between the front bumper 18 and the bumper cover 19, the front part inlet 22 for introducing cooling air into the radiator 62 mentioned later is formed. An engine hood 24 is disposed on the rear upper side of the vehicle body of the front bumper 18.

  A space composed of the front bumper reinforcement 16, the left and right front side members 14, the engine hood 24, an under cover 26 described later, and a dash panel 36 described later is an engine compartment room 20. It is said that. The engine compartment room 20 includes an engine 32 and a transmission 34, and a power unit 30 that drives at least the front wheels 48 is disposed (accommodated).

  The power unit 30 is an engine horizontal type in which a transmission 34 is attached to one side (for example, the left side) of the engine 32 in the vehicle width direction. The both ends of the power unit 30 in the vehicle width direction are supported by the left and right front side members 14 via an engine mount and a bracket (not shown).

  As shown in FIGS. 2 to 4, a substantially flat under cover 26 constituting the engine compartment room 20 (covering the vehicle body lower side of the engine compartment room 20) is disposed on the vehicle body lower side of the power unit 30. It is installed. The under cover 26 is formed of a resin material, and a front end portion thereof is integrally attached to a lower end portion of the bumper cover 19.

  Further, as shown in FIG. 5, a suspension member 40 that supports a suspension (not shown) is disposed on the vehicle body rear upper side of the under cover 26. The suspension member 40 includes a cross member 42 extending in the vehicle width direction, and a pair of left and right side members 44 extending from the outer sides of the cross member 42 in the vehicle width direction to the vehicle body rear side. A lower arm 46 constituting a suspension is attached to each side member 44, and a front wheel 48 is disposed on the outer side of each lower arm 46 in the vehicle width direction.

  In addition, a pair of corner portions 43 that extend outwardly in the vehicle width direction are integrally provided at both ends of the cross member 42 in the vehicle width direction. The pair of corner portions 43 are fixed to the lower surface of the front side member 14 by bolt fastening, and the rear end portions of the side members 44 are fixed to the lower end portions of the inclined portions of the front side member 14 by bolt fastening. Thus, the suspension member 40 is supported in a state suspended from the front side member 14.

  Therefore, a bolt fastening through hole 44B is formed at the rear end of the side member 44. A through hole 44 </ b> A for attaching a mounting portion 52 to be described later is formed in the middle portion of the side member 44. Further, a guide wall portion 27 (described later) formed on the under cover 26 is disposed on the vehicle body rear side of the cross member 42. A radiator support 50 is provided at the rear end of the under cover 26 (on the rear side of the vehicle body relative to the guide wall 27) to support a radiator 62 (described later) in a forward leaning posture.

  The radiator support 50 is formed with a ridge portion 51 having a rectangular cross section extending in the vehicle width direction and arranged in the front-rear direction, so that the lower end portion of the radiator 62 is attached between the two ridge portions 51. It has become. Further, both left and right end portions of the radiator support 50 are formed as flat mounting portions 52, and bolt fastening through holes 52 </ b> A and 52 </ b> B are formed at the front end portion and the rear end portion of the mounting portion 52, respectively. Yes.

  Therefore, as shown in FIGS. 5 and 6, the attachment portion 52 is connected to the middle portion of the side member 44 by a bolt inserted into the front through hole 52 </ b> A and the through hole 44 </ b> A formed in the middle portion of the side member 44. To be concluded. The mounting portion 52 and the rear end portion of the side member 44 are connected to each other in the front side member 14 by a bolt inserted into the rear through hole 52B and the through hole 44B formed in the rear end portion of the side member 44. It is fastened to the lower end of the inclined part.

  As shown in FIGS. 2 to 5, the cooling air (vehicle 12) that flows between the under cover 26 and the road surface (not shown) is provided at the rear portion of the under cover 26 (lower front of the vehicle body than the radiator 62). The bottom inlet 28 is formed so that the cooling air generated by running the air or the cooling air generated by the fan 64 described later is introduced into the radiator 62.

  The bottom introduction port 28 is formed in a rectangular shape with the vehicle width direction as a longitudinal direction when viewed from the bottom, and a guide wall portion 27 that extends to the rear upper side of the vehicle body is integrally projected at the front end portion thereof. . The guide wall 27 guides the cooling air to a core 62 </ b> A (described later) of the radiator 62. A front flap 70 is provided on the rear end side of the bottom inlet 28. The front flap 70 will be described in detail later.

  Further, as shown in FIG. 2, a substantially flat plate that partitions the engine compartment room 20 and the vehicle compartment 21 on the vehicle rear side of the power unit 30 and on the vehicle body upper side of the inclined portion of the left and right front side members 14. A dash panel 36 is provided. A dash cross member 37 having a substantially hat-shaped cross section that forms a closed cross-sectional structure with the dash panel 36 is attached to the lower side of the front surface of the dash panel 36 so as to extend in the vehicle width direction.

  Also, an instrument panel 38 is disposed on the rear side of the dash panel 36, and a front end portion of the floor panel 58 is provided at a rear end portion extending to the rear side of the vehicle body on the lower side of the dash panel 36. They are joined together. A tunnel portion 56 is formed at the center of the floor panel 58 in the vehicle width direction, and a cooling unit 60 is disposed on the vehicle body front side of the tunnel portion 56.

  That is, the cooling unit 60 that constitutes a cooling system for cooling the engine 32 is disposed on the rear side of the vehicle body from the power unit 30 and below the vehicle body of the dash cross member 37 in a side view as viewed from the vehicle width direction. ing. As shown in FIGS. 2 to 6, the cooling unit 60 has an air-cooled radiator (heat exchanger that exchanges heat with cooling air) 62 that radiates heat of cooling water that cools the engine 32 of the power unit 30. doing.

  An air-cooled condenser (condenser that exchanges heat with cooling air: not shown) that constitutes the refrigeration cycle of the vehicle air conditioner is provided on the front side of the radiator 62. Further, the cooling unit 60 is provided on the rear side of the vehicle body with respect to the radiator 62 so that the rotation axis direction is the front-rear direction of the vehicle body, and houses the fan 64 for introducing cooling air into the radiator 62 and the fan 64. And a shroud 66.

  The lower end portion of the radiator 62 is fixed to the radiator support 50, and is disposed so as to be inclined forward together with the capacitor in a side view shown in FIG. As shown in FIGS. 5 and 6, the radiator 62 includes a core portion 62 </ b> A including a plurality of tubes through which cooling water passes and heat radiating fins, and the core portion 62 </ b> A corresponds to the front inlet 22. It is cooled by the cooling air introduced from (the front part of the vehicle 12) and the bottom part introduction port 28 (the bottom part of the vehicle 12).

  The fan 64 is an axial fan (suction fan) configured to be electrically rotatable and to be able to adjust the air volume. When the vehicle 12 travels at a low speed (for example, travels at a speed less than 60 km / h) or stops (when the engine 32 is idling). In addition, the cooling air can be forcibly introduced into the condenser and the radiator 62 by being rotationally driven (including when the motor is stopped).

  As shown in FIGS. 2 to 4, a discharge port 54 is formed between the vehicle body lower side front end portion of the shroud 66 and the rear end portion of the radiator support 50. The discharge port 54 is formed in a rectangular shape with the vehicle width direction as a longitudinal direction when viewed from the bottom. From the discharge port 54, the heat in the engine compartment room 20 and the cooling exchanged through the radiator 62 is performed. Wind is discharged outside the vehicle.

  A rear flap 80 is provided on the front end side of the discharge port 54 to selectively take a closed posture protruding toward the rear of the vehicle body and an open posture protruding toward the vehicle body lower side. As shown in FIGS. 3 to 5, the rear flap 80 is formed in a flat plate shape having substantially the same size as the discharge port 54, and closes the discharge port 54 by taking a closing posture. ing.

  In addition, a front flap 70 is provided on the rear end side of the bottom inlet 28 so as to selectively take a protruding posture protruding downward from the vehicle body and a retracted posture protruding toward the front side of the vehicle body. As shown in FIGS. 2 to 6, the front flap 70 is formed in a flat plate shape that is sized to halve the opening area of the bottom inlet 28 when the storage posture is taken.

  That is, the front flap 70 does not block the bottom inlet 28 even when the front flap 70 is in the retracted position. The front flap 70 is configured to take a protruding posture so that the cooling air flowing between the under cover 26 and the road surface can be easily introduced into the bottom inlet 28 when the vehicle 12 travels at a low speed. ing.

  Also, as shown in FIGS. 2 to 6, the front flap 70 takes a protruding posture when the rear flap 80 takes a closed posture, and the front flap 70 takes a retracted posture when the rear flap 80 takes an open posture. (In other words, the rear flap 80 is in the closed position when the front flap 70 is in the protruding position, and the rear flap 80 is in the open position when the front flap 70 is in the retracted position. The radiator support 50 is provided with an interlocking mechanism 90 that interlocks the rear flap 80 and the front flap 70.

  More specifically, the front flap 70 is fixed to a front turning shaft 72 whose axial direction is the vehicle width direction, and the front turning shaft 72 is located on the left and right attachment portions 52 of the radiator support 50. Are supported by a pair of left and right support members 74 attached to each other via a bearing (not shown). The axial center portion of the front gear 76 is fixed to one axial end portion of the front rotation shaft 72 that protrudes outward from the one support member 74 in the vehicle width direction.

  Similarly, the rear flap 80 is fixed to a rear rotating shaft 82 whose axial direction is the vehicle width direction, and the rear rotating shaft 82 is mounted on the left and right mounting portions 52 of the radiator support 50, respectively. The pair of left and right support members 84 are supported via a bearing (not shown). Then, the axial center portion of the rear gear 86 is fixed to one axial end portion (the same side as the side where the front gear 76 is present) of the rear rotating shaft 82 protruding outward in the vehicle width direction from one support member 84. Has been.

  Further, a mounting bracket 63 is integrally formed on the outer side in the vehicle width direction of the radiator 62 (the side where the front gear 76 and the rear gear 86 exist), and a drive motor 92 is attached to the mounting bracket 63 by a mounting band 93. It is attached. The drive motor 92 is configured to be rotatable in both forward and reverse directions, and the shaft center portion of the drive gear 96 is fixed to the rotation shaft 94 of the drive motor 92.

  As shown in FIGS. 2, 7, and 8, the drive gear 96, the front gear 76, and the rear gear 86 are disposed at positions that are the vertices of the triangle as viewed from the side. An endless belt 98 as a belt-like member is wound around the front gear 76 and the rear gear 86. On the inner peripheral surface of the endless belt 98, a large number of grooves 98A are formed along the width direction (rotating axis direction), and the grooves 98A mesh with the drive gear 96, the front gear 76, and the rear gear 86. It is like that.

  Therefore, for example, when the drive gear 96 rotates counterclockwise in FIG. 2 due to the forward rotation of the drive motor 92, the front gear 76 and the rear gear 86 rotate in the same direction via the endless belt 98, and the front rotation The shaft 72 and the rear rotation shaft 82 are rotated in the same direction. Thereby, the front flap 70 takes a protruding posture, and the rear flap 80 takes a closed posture (see FIG. 7).

  Similarly, for example, when the drive gear 96 rotates clockwise in FIG. 2 due to the reverse rotation of the drive motor 92, the front gear 76 and the rear gear 86 rotate in the same direction via the endless belt 98, and the front part rotates. The shaft 72 and the rear rotation shaft 82 are rotated in the same direction. Thereby, the front flap 70 takes the retracted posture, and the rear flap 80 takes the open posture (see FIG. 8).

  As shown in FIG. 6, the rotation of the drive motor 92 in both forward and reverse directions is automatically controlled by the control device 100 according to the vehicle speed. That is, the control device 100 switches the rotation of the drive motor 92 in the forward direction or the reverse direction based on a predetermined speed (predetermined value) when the vehicle 12 is traveling on a flat road. It has become.

  More specifically, when the vehicle speed is less than a predetermined value (for example, 60 km / h), the control device 100 operates the interlock mechanism 90 (drive motor) so that the front flap 70 takes a protruding posture and the rear flap 80 takes a closed posture. 92), and when the vehicle speed is equal to or higher than a predetermined value (for example, 60 km / h), the control device 100 controls the interlock mechanism 90 (drive motor) so that the front flap 70 takes the retracted posture and the rear flap 80 takes the open posture. 92) is controlled.

  As shown in FIGS. 4 and 8, the control device 100 stops the rotational drive of the fan 64 when the rear flap 80 is in the open posture, that is, when the discharge port 54 is opened. Yes. Thus, outside air is prevented from being taken in from the discharge port 54 toward the fan 64.

  Next, the operation of the vehicle body front structure 10 according to the present embodiment configured as described above will be described.

  As shown in FIG. 7, when the vehicle 12 travels at a low speed (when the vehicle speed is less than 60 km / h) or stops, the drive motor 92 is rotated forward by the control of the control device 100. Then, the endless belt 98 rotates counterclockwise in FIG. 7, and the front flap 70 takes a protruding posture and the rear flap 80 takes a closed posture. Then, the fan 64 is rotationally driven under the control of the control device 100.

  As a result, the cooling air (outside air) introduced from the front introduction port 22 and passed through the engine compartment room 20 is introduced into the radiator 62, and the cooling air (outside air) is easily introduced from the bottom introduction port 28. The cooling air forcedly introduced from the bottom inlet 28 is efficiently introduced into the radiator 62.

  Therefore, even when the vehicle 12 is traveling at a low speed or stopped, a decrease in the air volume to the radiator 62 is suppressed, and the radiator 62 can be efficiently cooled (the cooling efficiency of the radiator 62 can be improved). At this time, since the rear flap 80 is in the closed posture, the discharge port 54 is closed. Therefore, the cooling air heat-exchanged through the radiator 62 passes through the fan 64 and is discharged out of the vehicle through the tunnel portion 56.

  On the other hand, as shown in FIG. 8, when the vehicle 12 is traveling at a high speed (when the vehicle speed is 60 km / h or more), the drive motor 92 is reversely rotated by the control of the control device 100. Then, the endless belt 98 rotates clockwise in FIG. 8, and the front flap 70 takes the retracted posture and the rear flap 80 takes the open posture. When the vehicle 12 travels at a high speed, a large amount of cooling air (outside air) is introduced from the front inlet 22, so that the rotation drive of the fan 64 is stopped under the control of the control device 100.

  Here, since the rear flap 80 is in the open posture, the discharge port 54 is opened. The front flap 70 does not protrude downward from the vehicle body because of the retracted posture. Therefore, when the vehicle 12 travels at a high speed, a negative pressure is generated between the vehicle 12 on the rear side of the vehicle body and the road surface with respect to the rear flap 80, and the cooling air exchanged heat through the radiator 62 is caused by the negative pressure. It is forcibly discharged from the discharge port 54 to the outside of the vehicle.

  That is, the cooling air heat exchanged through the radiator 62 is forcibly discharged from the front side of the vehicle body of the fan 64, and the fan 64 whose rotation is stopped does not become a wind guide resistance. Therefore, a wind flow is formed from the front inlet 22 to the outlet 54, and the cooling air (outside air) introduced from the front inlet 22 and passing through the engine compartment room 20 is efficiently introduced into the radiator 62.

  Therefore, when the vehicle 12 travels at a high speed, a decrease in the air volume to the radiator 62 is suppressed, and the radiator 62 can be efficiently cooled (the cooling efficiency of the radiator 62 can be improved). Since the front flap 70 does not block the bottom inlet 28, cooling air (outside air) is also introduced into the radiator 62 from the bottom inlet 28.

  In addition, when the fan 64 is driven to rotate with the discharge port 54 open, outside air is taken in from the discharge port 54, so that the cooling air that has passed through the radiator 62 and exchanged heat is discharged from the discharge port 54 to the outside of the vehicle. It is blocked from being discharged. However, since the control device 100 controls the fan 64 to stop rotating when the discharge port 54 is open, the cooling air heat exchanged through the radiator 62 is discharged from the discharge port 54. It is not obstructed to be discharged outside the vehicle.

  As described above, according to the present embodiment, the posture switching of the front flap 70 and the rear flap 80 and the rotational drive of the fan 64 are automatically controlled according to the vehicle speed, so that the cooling efficiency (cooling) for the radiator 62 is improved. Performance) can be improved. Therefore, the operating rate of the fan 64 can be reduced, and the fuel consumption can be improved in the vehicle 12.

  The vehicle body front structure 10 according to the present embodiment has been described with reference to the drawings. However, the vehicle body front structure 10 according to the present embodiment is not limited to the illustrated one, and the gist of the present invention is described. The design can be changed as appropriate without departing from the scope. For example, the rear flap 80 is not limited to a configuration that completely closes the discharge port 54, and may have a configuration having a slight gap.

  Further, the postures of the front flap 70 and the rear flap 80 are not limited to the configuration that automatically switches according to the vehicle speed, but is manually operated by a passenger operating a switch (not shown) in the vehicle compartment 21 (manually). It may be configured to switch. Further, the reference speed for switching is not limited to 60 km / h.

DESCRIPTION OF SYMBOLS 10 Car body front structure 28 Bottom part inlet 30 Power unit 48 Front wheel 54 Outlet 62 Radiator 64 Fan 70 Front flap 72 Front rotation shaft 76 Front gear 80 Rear flap 82 Rear rotation shaft 86 Rear gear 90 Interlock mechanism 92 Drive Motor 94 Rotating shaft 96 Drive gear 98 Endless belt (band-like member)
100 Control device

Claims (4)

A radiator that is disposed on the rear side of the vehicle body relative to at least the power unit that drives the front wheels, and that constitutes a cooling system for the power unit;
A fan disposed on the rear side of the vehicle body relative to the radiator, for introducing cooling air to the radiator;
Provided at the front lower side of the vehicle body than the radiator, and a bottom inlet for introducing cooling air to the radiator;
A discharge port provided on the vehicle body lower side between the radiator and the fan, and for discharging the cooling air that has passed through the radiator to the outside of the vehicle;
A front flap that is provided on the rear end side of the bottom introduction port and selectively takes a protruding posture protruding toward the vehicle body lower side and a retracted posture protruding toward the vehicle body front side;
A rear flap that is provided on the front end side of the discharge port and selectively takes a closing posture protruding toward the vehicle rear side and an opening posture protruding toward the vehicle body lower side;
The rear flap and the front flap so that the front flap takes a protruding posture when the rear flap takes a closed posture, and the front flap takes a retracted posture when the rear flap takes an open posture. An interlocking mechanism for interlocking with
Body front structure with   The control apparatus which controls the said interlock mechanism so that the said rear flap will take a closed attitude | position when a vehicle speed is less than a predetermined value, and the said rear flap will take an open attitude | position when a vehicle speed is more than a predetermined value. Vehicle body front structure described in 2. The interlocking mechanism is
A front gear fixed to one axial end of the front rotation shaft to which the front flap is attached;
A rear gear fixed to one axial end of the rear pivot shaft to which the rear flap is attached;
A drive gear fixed to the rotation shaft of a drive motor whose rotation in both forward and reverse directions is controlled by the control device;
A belt-like member wound around the front gear, the rear gear, and the drive gear;
The vehicle body front part structure according to claim 2, comprising:   The vehicle body front structure according to claim 2 or 3, wherein the control device is configured to stop the rotational drive of the fan when the rear flap is in an open posture.

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