JP5884718B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure in which a cooling unit for cooling an engine is arranged on the vehicle body rear side of an engine compartment room.

  2. Description of the Related Art A fuel cooling structure that cools a pipe (fuel passage) through which fuel flows using cooling air introduced by a fan for cooling a radiator is conventionally known (see, for example, Patent Document 1).

JP 2003-254176 A

  However, in such a structure, since the piping through which the fuel flows is disposed between the radiator and the fan that face each other, the piping becomes a wind guide resistance, which may reduce the cooling efficiency of the radiator. In particular, in a vehicle in which a radiator is disposed on the vehicle body rear side of the engine compartment room, a large part such as an engine is disposed on the vehicle body front side of the radiator, which may make it difficult to ensure sufficient cooling performance. .

  Therefore, an object of the present invention is to obtain a vehicle body front structure that can cool a fuel while ensuring the cooling performance of a radiator.

  In order to achieve the above object, the vehicle body front structure according to claim 1 of the present invention is disposed on the vehicle body rear side of the engine compartment room in which the engine is accommodated, and is a cooling solvent for cooling the engine. A radiator that dissipates the heat of the radiator, a fuel cooling device that is disposed on the rear lower side of the radiator and that cools fuel supplied to the engine, and that is disposed on the rear upper side of the fuel cooling device, the radiator and the And a fan for introducing cooling air into the fuel cooling device.

  According to the first aspect of the present invention, the fuel cooling device for cooling the fuel supplied to the engine is disposed between the lower rear side of the vehicle body of the radiator and the lower front side of the vehicle body of the fan. Therefore, the fuel cooling device does not become a wind guide resistance of the cooling air introduced into the radiator. Then, the cooling air is introduced not only into the radiator but also into the fuel cooling device by the fan. Therefore, it is possible to cool the fuel while ensuring the cooling performance of the radiator.

  A vehicle body front structure according to claim 2 of the present invention is disposed on the vehicle body rear side of an engine compartment room in which an engine is housed, and a radiator that radiates heat of a cooling solvent for cooling the engine; The cooling air that is disposed on the lower rear side of the radiator and that cools the fuel supplied to the engine and the cooling air generated by the fan that is disposed on the upper rear side of the fuel cooling device and the radiator are supplied to the radiator. A first air guide path for guiding and a second air guide path for guiding to the fuel cooling device are provided.

  According to the second aspect of the present invention, the fuel cooling device for cooling the fuel supplied to the engine is disposed between the lower rear side of the radiator and the lower front side of the fan. Therefore, the fuel cooling device does not become a wind guide resistance of the cooling air introduced into the radiator. Then, the cooling air generated by the fan is guided to the radiator by the first air guiding path and is guided to the fuel cooling device by the second air guiding path. Therefore, it is possible to cool the fuel while ensuring the cooling performance of the radiator.

  The vehicle body front part structure according to claim 3 is the vehicle body front part structure according to claim 1 or 2, wherein the vehicle body front part structure is arranged on the vehicle body lower side of the engine and supports the fuel cooling device. An under cover having a portion is provided.

  According to the third aspect of the present invention, the under cover disposed on the lower side of the engine body has the support portion that supports the fuel cooling device. Therefore, the number of parts can be reduced as compared with a configuration in which a support member for supporting the fuel cooling device is provided separately from the under cover.

  As described above, according to the invention according to claim 1, it is possible to cool the fuel while ensuring the cooling performance of the radiator.

  According to the invention which concerns on Claim 2, a fuel can be cooled, ensuring the cooling performance of a radiator.

  According to the invention of claim 3, the number of parts can be reduced.

It is a perspective view which shows the vehicle provided with the vehicle body front part structure which concerns on this embodiment seeing from a vehicle body upper side. FIG. 2 is a cross-sectional view taken along line XX in FIG. 1. 1 is a perspective view showing a schematic configuration of a vehicle body front structure according to the present embodiment as viewed from the vehicle body lower side with an under cover removed. It is a perspective view which shows the shape of the undercover which comprises the vehicle body front part structure which concerns on this embodiment seeing from the vehicle body lower side. It is a perspective view which shows the case where the cooling unit and fuel cooling device which comprise the vehicle body front part structure which concerns on this embodiment are modularized.

  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, and an arrow RI is a vehicle body right direction. Further, in the following description, when using front / rear, up / down, and left / right directions unless otherwise specified, front / rear in the front / rear direction of the vehicle body, up / down in the up / down direction of the vehicle body, and left / right in the left / right direction of the vehicle body (vehicle width direction).

  As shown in FIGS. 2 and 3, a pair of left and right front side members 14 extending in the front-rear direction of the vehicle body are disposed on the right side and the left side of the vehicle (diesel vehicle) 12. Has been. Each front side member 14 is formed in a rectangular frame-shaped closed cross-sectional structure, and has an inclined portion (kick portion) 14 </ b> A at a midway portion in the longitudinal direction of the vehicle body.

  Thereby, each front side member 14 is extended in the vehicle body front-back direction in the vehicle body front side rather than the inclination part 14A in the position higher predetermined height than the vehicle body rear side. 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.

  A front bumper 18 is disposed on the front side of the vehicle body of the front bumper reinforcement 16, and as shown in FIG. 1, cooling air is introduced to a radiator 42, which will be described later, on the lower side of the vehicle body of the front bumper 18. For this purpose, a first inlet 22 is formed. An introduction port 21 is also formed on the upper side of the vehicle body of the front bumper 18, and a part of the cooling air introduced from the introduction port 21 is introduced into the radiator 42 when the vehicle 12 travels. .

  The space composed of the front bumper reinforcement 16, the left and right front side members 14, the engine hood 36, the dash panel 24 described later, and the under cover 60 described later is an engine compartment room 20. It is said that. The engine compartment room 20 includes a (diesel) engine 32 and a transmission 34, and a power unit 30 that drives at least the front wheels 38 is disposed.

  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).

  Further, as shown in FIG. 2, a substantially flat plate that partitions the engine compartment room 20 and the vehicle compartment on the vehicle rear side of the power unit 30 and on the vehicle body upper side of the inclined portion 14A of the left and right front side members 14. A dash panel 24 is provided. A dash cross member 26 having a substantially hat-shaped cross section that forms a closed cross-sectional structure with the dash panel 24 is attached to the lower side of the dash panel 24 so as to extend in the vehicle width direction.

  An instrument panel 28 is disposed on the rear side of the dash panel 24 with respect to the vehicle body. A cooling unit 40 for cooling the engine 32 and a fuel cooling device 50 to be described later is provided on the vehicle body rear side of the power unit 30 and on the vehicle body lower side of the dash cross member 26 in a side view as viewed from the vehicle width direction. It is arranged.

  As shown in FIGS. 2 and 3, the cooling unit 40 includes an air-cooled radiator (a heat exchanger that exchanges heat with cooling air) that dissipates heat of cooling water as a cooling solvent that cools the engine 32 of the power unit 30. 42) (axial flow) fan 44 for introducing cooling air into the radiator 42 or the fuel cooling device 50 when the vehicle 12 is stopped or at a low speed, or for discharging heat in the engine compartment room 20 And a shroud 46 for housing the fan 44.

  The radiator 42 has a core portion 42A (see FIG. 3) having a plurality of tubes through which cooling water passes and heat dissipating fins, and a condenser constituting the refrigeration cycle of the vehicle air conditioner is disposed at the front portion of the radiator 42. (Condenser: not shown) is provided integrally. As shown in FIG. 2, the radiator 42 (and the condenser) is disposed on the front side of the vehicle body of the fan 44 so as to assume a forward leaning posture in a side view as viewed from the vehicle width direction. The lower part and the lower side of the vehicle body of the fan 44 are spaced apart from each other by the length of the fuel cooling device 50 in the vehicle body longitudinal direction.

  The fan 44 is configured to be electrically rotated with the front-rear direction of the vehicle body as the rotation axis direction, and is accommodated in a shroud 46 disposed in a tunnel portion 48 formed at the center in the vehicle width direction. As the fan 44 rotates, cooling air flows from the vehicle body front side (first introduction port 22) and the vehicle body lower side (second introduction port 62 and third introduction port 52 described later) toward the vehicle body rear side. The cooling air is forcibly introduced into the radiator 42 and the fuel cooling device 50.

  The fuel cooling device 50 is disposed in a substantially horizontal position at the center in the vehicle width direction between the lower portion of the radiator 42 (lower rear side of the vehicle body) and the lower front side of the vehicle body of the fan 44. That is, the fuel cooling device 50 is disposed at a lower position offset from the space between the core portion 42 </ b> A of the radiator 42 and the fan 44 that face each other in the front-rear direction.

  The fuel cooling device 50 is an air-cooled heat exchanger that is connected in the middle of a pipe (a pipe disposed below the vehicle body floor) connecting a fuel tank (not shown) and the engine 32. The liquid fuel (light oil) sent (supplied) to the engine 32 is heat-exchanged with the cooling air introduced into the fuel cooling device 50 to cool the liquid fuel.

  As shown in FIGS. 2 and 4, a substantially flat under cover 60 constituting the engine compartment room 20 (covering the lower side of the vehicle body of the engine compartment room 20) is arranged on the lower side of the vehicle body of the power unit 30. It is installed. The under cover 60 is a large full under cover formed of a resin material, and the vehicle body front side end portion is integrally attached to the vehicle body lower side end portion of the bumper cover 19.

  As shown in FIG. 1, the bumper cover 19 is configured integrally with the front bumper 18 on the lower side of the vehicle body of the front bumper 18, and the first introduction port 22 includes the front bumper 18, the bumper cover 19, and the bumper cover 19. It is designed to be formed between.

  2 and 4, on the rear side of the under cover 60, cooling air flowing between the under cover 60 and the road surface (not shown) (wind generated when the vehicle 12 travels or A second introduction port 62 for introducing the air generated by the fan 44 into the radiator 42 is formed.

  The second introduction port 62 is formed in the vehicle width direction center of the under cover 60 in a rectangular shape with the vehicle width direction as a longitudinal direction in a plan view, and the length in the vehicle width direction of the radiator 42 The length is equal to or greater than the length of the core portion 42A in the vehicle width direction. A duct 64 for guiding at least the cooling air introduced from the second introduction port 62 to the core portion 42 </ b> A of the radiator 42 is provided on the vehicle body upper side of the second introduction port 62.

  Specifically, the duct 64 has a plurality of (for example, six) side walls that include a plurality of (for example, five in the vehicle width direction) partitioning the second introduction port 62. 66 and a plurality of (for example, five) upper walls 68 that integrally connect the upper ends of the side walls 66 in the vehicle width direction.

  The duct 64 (upper wall 68) is inclined toward the rear upper side of the vehicle body as viewed from the side in the vehicle width direction, so that cooling air can be introduced into at least the lower half of the core portion 42A of the radiator 42. It is configured. And the cooling air introduced from the 1st inlet 22 is guided to the upper wall 68 of the duct 64, and is introduce | transduced into the upper half of the core part 42A of the radiator 42 at least (refer FIG. 2). .

  In addition, a flat flap 69 is integrally projected from the vehicle body rear side edge portion of the second introduction port 62 toward the vehicle body lower side over the entire edge portion. The flap 69 facilitates the introduction of the cooling air flowing between the under cover 60 and the road surface when the vehicle 12 is traveling into the second introduction port 62 (duct 64). The cooling air path introduced from the first inlet 22 and the second inlet 62 and guided to the radiator 42 by the duct 64 is the first air guide path C1.

  Furthermore, a part of the under cover 60 on the vehicle body rear side of the second introduction port 62 is a support portion 60A that supports the fuel cooling device 50 from the vehicle body lower side. A third introduction port 52 for introducing cooling air into the fuel cooling device 50 is formed at the center of the support portion 60A in the vehicle width direction.

  As shown in FIG. 4, the third introduction port 52 includes a plurality of rows (for example, three rows) of slit holes 54 arranged in the longitudinal direction of the vehicle body in the longitudinal direction of the vehicle. The slit holes 54 are partitioned at equal intervals in the vehicle width direction by a plurality of (for example, four) partition walls 56. The length of each slit hole 54 in the vehicle width direction is equal to or longer than the length of the fuel cooling device 50 in the vehicle width direction.

  A flat flap 58 having a length equal to or longer than the length of each slit hole 54 in the vehicle width direction is provided at the vehicle width direction center portion of the under cover 60 on the vehicle body rear side of the third introduction port 52. Projected integrally toward The flap 58 facilitates introduction of the cooling air flowing between the under cover 60 and the road surface into the third introduction port 52 (slit hole 54) when the vehicle 12 is traveling. The cooling air path introduced from the third introduction port 52 (slit hole 54) and guided to the fuel cooling device 50 is the second air guiding path C2.

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

  As described above, the vehicle body front structure 10 according to the present embodiment employs a configuration in which the cooling unit 40 including the radiator 42 is not disposed on the vehicle body front side of the power unit 30. A fuel cooling device 50 that cools the liquid fuel (light oil) used in the vehicle (diesel vehicle) 12 is substantially horizontal between the lower portion of the radiator 42 (lower rear of the vehicle body) and the lower front of the vehicle body of the fan 44. It is arrange | positioned so that it may become a posture.

  That is, the fuel cooling device 50 is disposed at a lower position offset from the space between the core portion 42 </ b> A of the radiator 42 and the fan 44 that face each other in the front-rear direction. Therefore, the fuel cooling device 50 does not become a wind guide resistance of the cooling air introduced into the core portion 42A of the radiator 42.

  Further, a first inlet 22 for introducing cooling air to the radiator 42 is formed between the front bumper 18 and the bumper cover 19, and the under cover 60 is also used to introduce cooling air to the radiator 42. A second introduction port 62 (duct 64) is formed. That is, the vehicle 12 is formed with a first air guide path C1 for introducing cooling air to the radiator 42.

  Furthermore, the vehicle body rear side of the under cover 60 is a support portion 60A that supports the fuel cooling device 50, and the support portion 60A has a third introduction port 52 (slit hole for introducing cooling air into the fuel cooling device 50). 54) is formed. That is, the vehicle 12 is formed with a second air guide path C2 for introducing cooling air into the fuel cooling device 50, separately from the first air guide path C1.

  Therefore, the cooling air can be effectively introduced not only to the radiator 42 but also to the fuel cooling device 50 by the running of the vehicle 12 and the fan 44. In particular, flat flaps 69 and 58 extending in the vehicle width direction are formed at the vehicle width direction central portion on the vehicle body lower side of the under cover 60 where the wind flows smoothly when the vehicle 12 travels. 2 Cooling air is easily introduced from the inlet 62 (duct 64) and the third inlet 52 (slit hole 54).

  Therefore, the liquid fuel can be efficiently cooled while ensuring the cooling performance of the radiator 42. That is, according to this, since the high-pressure fuel injection can be executed in the (diesel) engine 32 (engine performance can be improved), for example, when the vehicle 12 travels on an uphill road, This is effective when a high load is applied.

  When the vehicle 12 is traveling, the flaps 69 and 58 make it easy to introduce cooling air into the second introduction port 62 (duct 64) and the third introduction port 52 (slit hole 54). There is also an advantage that a rectifying effect is obtained with respect to the wind flowing in the lower side (aerodynamic performance can be improved).

  In addition, since a part of the under cover 60 serves as a support portion 60 </ b> A that supports the fuel cooling device 50, the number of parts is smaller than a configuration in which a support member that supports the fuel cooling device 50 is provided separately from the under cover 60. Can be reduced. Therefore, weight reduction and cost reduction of the vehicle 12 can be achieved, and a reduction in fuel consumption performance can be suppressed.

  Further, since the fuel cooling device 50 is provided between the lower part of the radiator 42 (the rear lower side of the vehicle body) and the lower front side of the vehicle body of the fan 44, the cooling unit 40 and the fuel cooling device 50 are shown in FIG. Can be configured as a cooling module 70 integrated with each other. Therefore, the fuel cooling device 50 can be easily assembled to the vehicle 12 together with the cooling unit 40 (the assembling property of the fuel cooling device 50 to the vehicle 12 can be improved).

  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 fan 44 may be provided in a forward inclined posture in order to introduce cooling air into the fuel cooling device 50 more efficiently.

  Further, the flap 58 provided for the third introduction port 52 may be provided in the fuel cooling device 50. In this case, the flap 58 may be inserted into a slit-like opening (not shown) formed in the under cover 60, and the flap 58 may protrude downward from the vehicle body.

DESCRIPTION OF SYMBOLS 10 Car body front part structure 20 Engine compartment room 32 Engine 42 Radiator 44 Fan 50 Fuel cooling device 60 Under cover 60A Support part C1 1st wind guide path C2 2nd wind guide path

Claims (3)

A radiator that is disposed on the vehicle body rear side of an engine compartment room in which the engine is housed, and that dissipates heat of a cooling solvent for cooling the engine;
A fuel cooling device that is disposed on the lower rear side of the radiator and cools the fuel supplied to the engine;
A fan that is disposed on the rear upper side of the vehicle body of the fuel cooling device and that introduces cooling air into the radiator and the fuel cooling device;
Body front structure with A radiator that is disposed on the vehicle body rear side of an engine compartment room in which the engine is housed, and that dissipates heat of a cooling solvent for cooling the engine;
A fuel cooling device that is disposed on the lower rear side of the radiator and cools the fuel supplied to the engine;
A first wind guide path for guiding cooling air generated by a fan disposed on the rear upper side of the vehicle body of the fuel cooling device to the radiator, and a second air guide path for leading to the fuel cooling device;
Body front structure with   The vehicle body front part structure according to claim 1 or 2, further comprising an under cover disposed on a lower side of the vehicle body of the engine and having a support portion for supporting the fuel cooling device.

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