JP2014094650A - Vehicle body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the deterioration of the cooling performance of a radiator.SOLUTION: A vehicle body front part structure 10 includes: a radiator 42 which is disposed at the vehicle body rear side of an engine compartment room in which a power unit 30 for driving at least front wheels is stored and radiates heat of a cooling solvent for cooling the power unit 30; a liquid feeding pipe 46 which is arranged at the upstream side relative to the radiator 42 when viewed in a circulation direction of the cooling solvent so as to circulate the cooling solvent between the power unit 30 and the radiator 42 and has heat conductivity; and a storage member 26 which forms a space separated from the engine compartment room and stores the liquid feeding pipe 46 in the space.

Description

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

  A vehicle body front structure in which a cooling unit including a radiator and a fan is disposed on the rear side of the vehicle body in the engine compartment room, that is, on the rear side of the power unit (including the engine and transmission) that drives at least the front wheels, has been conventionally known. (For example, refer to Patent Document 1).

International Publication No. 2010/097890 Pamphlet

  As described above, when the cooling unit is arranged on the rear side of the vehicle body of the power unit, it becomes a problem to sufficiently introduce the cooling air into the radiator of the cooling unit. In other words, it becomes a problem to prevent the cooling performance of the radiator from deteriorating even if the cooling air is not sufficiently introduced into the radiator.

  Accordingly, an object of the present invention is to obtain a vehicle body front structure that can suppress a decrease in the cooling performance of a radiator.

  In order to achieve the above object, the vehicle body front structure according to claim 1 according to the present invention is disposed on the vehicle body rear side of an engine compartment room in which at least a power unit for driving a front wheel is accommodated, and cools the power unit. A radiator that dissipates the heat of the cooling solvent, and heat conductivity piped upstream of the radiator in the circulation direction of the cooling solvent to circulate the cooling solvent between the power unit and the radiator. The liquid feeding pipe and the engine compartment room constitute a space isolated from each other, and a housing member that houses the liquid feeding pipe is provided in the space.

  According to the first aspect of the present invention, the heat-conducting liquid supply pipe piped upstream of the radiator in the circulation direction of the cooling solvent is isolated from the engine compartment room (i.e., from the engine compartment room). (Which is also low in temperature). Therefore, a certain amount of heat is released from the cooling solvent flowing through the liquid supply pipe before being sent to the radiator in the space of the housing member, and the temperature of the cooling solvent sent to the radiator is reduced in advance. That is, according to this, even if the cooling air is not sufficiently introduced into the radiator, a decrease in the cooling performance of the radiator is suppressed.

  Moreover, the vehicle body front part structure according to claim 2 is the vehicle body front part structure according to claim 1, wherein a heat dissipating material that dissipates heat of the liquid feeding pipe is disposed in the space of the housing member. It is characterized by being provided.

  According to invention of Claim 2, the heat radiating material which thermally radiates the heat of a liquid feeding pipe is provided in the space of an accommodating member. Therefore, the heat dissipation performance with respect to the liquid feeding pipe accommodated in the space of the accommodating member is improved. That is, according to this, the heat dissipation efficiency of the cooling solvent flowing through the liquid feeding pipe before being sent to the radiator is improved, and the temperature of the cooling solvent sent to the radiator is efficiently reduced.

  The vehicle body front structure according to claim 3 is the vehicle body front structure according to claim 1 or 2, wherein the housing member is a dash panel that partitions the engine compartment room and the vehicle compartment. It is a dash cross member attached to.

  According to the third aspect of the present invention, the housing member is a dash cross member attached to a dash panel that partitions the engine compartment room and the vehicle compartment. Therefore, an increase in weight and an increase in the number of parts are suppressed as compared with a configuration in which the housing member is provided separately from the dash cross member.

  Further, the vehicle body front structure according to claim 4 is the vehicle body front structure according to claim 3, wherein the dash cross member has a curved portion curved upward of the vehicle body. The liquid pipe is in contact with the inner surface of the lower wall in the bending portion and the inner surface of the upper wall on both sides of the bending portion.

  According to invention of Claim 4, the liquid feeding pipe is contacting the lower wall inner surface in the curved part of a dash cross member, and the upper wall inner surface in the both sides of the curved part. Accordingly, the dash cross member is reinforced by the liquid feeding pipe.

  As described above, according to the first aspect of the present invention, it is possible to suppress a decrease in the cooling performance of the radiator.

  According to the invention which concerns on Claim 2, the temperature of the cooling solvent sent to a radiator can be reduced efficiently.

  According to the invention which concerns on Claim 3, compared with the structure by which an accommodating member is provided separately from a dash cross member, the increase in a weight and the increase in a number of parts can be suppressed.

  According to the invention which concerns on Claim 4, a dash cross member can be reinforced with a liquid feeding pipe.

It is a sectional side view which shows schematic structure of the vehicle body front part structure which concerns on this embodiment. It is a perspective view showing a schematic structure of a vehicle body front part structure according to the present embodiment. It is a perspective view which expands and shows the dash cross member which comprises the vehicle body front part structure which concerns on this embodiment. It is a front view showing a schematic structure of a vehicle body front part structure according to the present embodiment. (A) It is XX arrow sectional drawing in FIG. (B) It is a YY arrow directional cross-sectional view in FIG.

  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, up / down in the up / down direction of the vehicle, and left / right in the left / right direction of the vehicle (vehicle width direction).

  As shown in FIGS. 1 and 2, a pair of left and right front side members 14 extending in the longitudinal direction of the vehicle body are disposed on the right side and the left side of the vehicle 12 (both sides of the vehicle body). Each front side member 14 has an inclined part (kick part) 14A in the middle part in the longitudinal direction of the vehicle body. The front side of the vehicle body is located at a predetermined height higher than the inclined side of the vehicle body at the front side of the vehicle body. It extends in the direction.

  A front bumper reinforcement 16 extending in the vehicle width direction is installed at the front end of the pair of left and right front side members 14. As an example, the front bumper reinforcement 16 and each front side member 14 are formed into a long rectangular pipe shape by extrusion molding of a metal material such as aluminum or aluminum alloy so as to form a rectangular frame-like closed cross-sectional structure. Is formed.

  A crush box (not shown) as an impact absorber is integrally and continuously provided in the axial direction of each front side member 14 between each front side member 14 and the front bumper reinforcement 16. Good. In addition, a front bumper 18 is disposed on the front side of the vehicle body of the front bumper reinforcement 16, and an inlet 22 for introducing cooling air to a radiator 42 described later is formed below the front bumper 18. ing.

  A space configured by (front) the front bumper reinforcement 16, the left and right front side members 14, and a dash panel 24 described later is an engine compartment room 20. The engine compartment room 20 includes an engine 32 and a transmission 34, and houses a power unit 30 that drives at least a front wheel (not shown).

  In addition, a substantially flat dash panel 24 that partitions the engine compartment room 20 and the vehicle compartment is provided on the vehicle body 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. ing. 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.

  As shown in FIGS. 2 and 3, the center portion in the vehicle width direction of the dash cross member 26 is a curved portion 26A that is curved in an arc shape upward, and both sides in the vehicle width direction are respectively The straight portion 26B is used. Further, as shown in FIG. 1, an instrument panel 28 is disposed on the vehicle body rear side of the dash panel 24. A cooling unit 40 constituting the vehicle body front structure 10 is disposed 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.

  As shown in FIGS. 1, 2, and 4, the cooling unit 40 includes an air-cooled radiator (cooling air and a cooling air) that dissipates heat of cooling water as a cooling solvent for cooling the power unit 30 (engine 32). A heat exchanger (heat exchanger for exchanging heat) 42 and a fan 44 for introducing cooling air into the radiator 42 when the vehicle 12 is stopped or for discharging the heat in the engine compartment room 20. .

  The radiator 42 is provided with a core portion 42A having a plurality of tubes through which cooling water passes and heat dissipating fins, and a left end portion of the core portion 42A, and is supplied with cooling water heated by heat exchange with the heat in the engine 32. An inflow tank 42B, and an outflow tank 42C that is provided at the right end of the core portion 42A and allows the cooling water cooled by passing through the core portion 42A to flow out.

  A condenser (condenser: not shown) that constitutes the refrigeration cycle of the vehicle air conditioner is integrally provided at the front portion of the radiator 42. Further, as shown in FIG. 1, 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.

  Between the power unit 30 (engine 32) and the radiator 42, radiator hoses 36, 37, and 38 for circulating cooling water for cooling the power unit 30 (engine 32) and a radiator pipe 46 as a liquid feed pipe are connected. Has been. The radiator pipe 46 constituting the cooling water circulation path is formed in a cylindrical shape from a relatively hard metal having thermal conductivity, and is an example of a housing member constituting a space isolated from the engine compartment room 20. It is disposed in the dash cross member 26.

  Specifically, as shown in FIGS. 3 and 4, the radiator pipe 46 is formed in a straight shape along the vehicle width direction except for both end portions 46A and 46B, and has a substantially central portion 46C. Are arranged so as to be positioned at a substantially central portion of the curved portion 26 </ b> A of the dash cross member 26. That is, as shown in FIGS. 4 and 5A, the substantially central portion 46C of the radiator pipe 46 has its outer peripheral surface in contact with the inner surface of the lower wall 26C and the inner surface of the front wall 26E in the curved portion 26A. The dash cross member 26 is disposed at the lower front corner.

  Further, both end portions of the radiator pipe 46, that is, the right end portion 46A and the left end portion 46B are bent and formed at approximately 90 degrees toward the vehicle body front side and the vehicle body lower side, respectively. As shown in FIGS. 4 and 5B, the outer peripheral surfaces of the bent portions 46D and 46E of the right end portion 46A and the left end portion 46B are the both sides in the vehicle width direction of the curved portion 26A, that is, the straight portions 26B. The dash cross member 26 is disposed at the front upper corner of the dash cross member 26 so as to be in contact with the inner surface of the upper wall 26D and the inner surface of the front wall 26E.

  That is, in other words, the curved portion 26A of the dash cross member 26 is configured such that the outer peripheral surfaces of the bent portions 46D and 46E of the right end portion 46A and the left end portion 46B of the radiator pipe 46 are linear portions 26B on both sides in the vehicle width direction. The outer peripheral surface of the substantially central portion 46C of the radiator pipe 46 is curved with a curvature so as to contact the inner surface of the lower wall 26C while being in contact with the inner surface of the upper wall 26D.

  2 to 4, the right end portion 46 </ b> A of the radiator pipe 46 protrudes from the front wall 26 </ b> E of the dash cross member 26, and a radiator hose whose one end portion is connected to the upper portion of the engine 32. The other end of 36 is connected in communication. The left end portion 46B of the radiator pipe 46 protrudes from the lower wall 26C of the dash cross member 26, and the other end portion of the radiator hose 37 whose one end portion is connected to the upper end portion of the inflow tank 42B of the radiator 42. Communication connection is established.

  Further, one end of a radiator hose 38 is connected to the lower end of the outflow tank 42 </ b> C of the radiator 42, and the other end of the radiator hose 38 is connected to a lower part of the engine 32. Therefore, the cooling water heated by heat exchange with the heat in the engine 32 is sent from the radiator hose 36 to the radiator 42 through the radiator pipe 46 and the radiator hose 37, and the heat is radiated by the radiator 42 (cooling). Cooled by heat exchange with wind.

  Then, the cooling water cooled by the radiator 42 is sent into the engine 32 through the radiator hose 38 and is heat-exchanged with the heat in the engine 32 to cool the inside of the engine 32. The radiator pipe 46 in the dash cross member 26 is disposed upstream of the radiator 42 in the circulating direction of the cooling water. As shown in FIG. 5, the radiator pipe 46 is disposed in the dash cross member 26. A heat dissipating material 48 that dissipates heat from the radiator pipe 46 is provided in contact with the outer peripheral surface of 46.

  Further, the radiator hoses 36, 37, and 38 that constitute the cooling water circulation path are made of rubber, for example, and the radiator hose 36 and the radiator hose 38 that are connected to the engine 32 are connected to the core portion 42A of the radiator 42. It is piped so as not to be located in front of. That is, each of the radiator hoses 36 and 38 is piped so as not to block the cooling air introduced into the core portion 42A of the radiator 42.

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

  The cooling water heated by heat exchange with the heat in the engine 32 passes through the radiator hose 36 and is sent to a radiator pipe 46 having thermal conductivity provided upstream of the radiator 42 in the circulating direction of the cooling water.

  Here, the radiator pipe 46 is accommodated in a space isolated from the engine compartment room 20, that is, in a dash cross member 26 having a temperature lower than that of the engine compartment room 20. Therefore, a certain amount of heat dissipation of the cooling water flowing through the radiator pipe 46 before being sent to the radiator 42 can be performed in the space inside the dash cross member 26.

  In addition, in the dash cross member 26, the heat radiating material 48 for radiating the heat of the radiator pipe 46 is provided in contact with the outer peripheral surface of the radiator pipe 46, so that the heat radiating performance with respect to the radiator pipe 46 is improved. Has been. That is, the heat dissipation efficiency (heat exchange efficiency) of the cooling water flowing through the radiator pipe 46 before being sent to the radiator 42 is improved. Therefore, the temperature of the cooling water before being sent to the radiator 42 can be efficiently reduced.

  The cooling water whose temperature has been reduced in advance by passing through the radiator pipe 46 is sent to the inflow tank 42B of the radiator 42 through the radiator hose 37, and is sent to the inflow tank 42B (the water temperature is reduced). The cooling water is cooled by heat exchange with the cooling air (heat is radiated) while passing through the core portion 42A of the radiator 42.

  Therefore, even if the power unit 30 is disposed on the front side of the vehicle body of the radiator 42 (even if the cooling air is not sufficiently introduced into the radiator 42), it is possible to suppress a decrease in the cooling performance of the radiator 42. .

  The cooling water cooled by the core portion 42A of the radiator 42 is sent to the outflow tank 42C, and is sent from the outflow tank 42C through the radiator hose 38 into the engine 32. That is, the inside of the engine 32 is cooled by the circulation of such cooling water (a temperature increase in the engine 32 is suppressed).

  Further, in the vehicle body front structure 10 according to the present embodiment, the housing member that houses the radiator pipe 46 is attached to the dash panel 24 to form the dash cross member 26 that forms a closed cross-sectional structure. Therefore, compared to a configuration in which the housing member is provided separately from the dash cross member 26, an increase in weight and an increase in the number of parts can be suppressed or prevented.

  Further, the radiator pipe 46 is formed of a relatively hard metal in a straight shape, and the inner surface of the lower wall 26C of the curved portion 26A of the dash cross member 26 and both sides of the curved portion 26A in the vehicle width direction (straight portion 26B). ) In contact with the inner surface of the upper wall 26D. Therefore, the curved portion 26A of the dash cross member 26 can be reinforced from the inside by the radiator pipe 46, and the collision safety performance in 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 housing member in the present embodiment is not limited to the dash cross member 26.

  Further, the present invention is not limited to the configuration in which the heat radiating material 48 is provided in the dash cross member 26. Further, the dash cross member 26 is not limited to the one having the curved portion 26A. Therefore, the radiator pipe 46 is not limited to the configuration in which the inner surface of the lower wall 26C in the curved portion 26A and the inner surface of the upper wall 26D on both sides in the vehicle width direction (straight portion 26B) of the curved portion 26A are not limited.

10 Car body front structure 20 Engine compartment room 24 Dash panel 26 Dash cross member (housing member)
26A Curved portion 26B Linear portion 26C Lower wall 26D Upper wall 30 Power unit 42 Radiator 46 Radiator pipe (liquid feed pipe)
48 Heat dissipation material

Claims (4)

A radiator that is disposed on the vehicle body rear side of an engine compartment room that houses at least a power unit that drives the front wheels, and that dissipates heat of a cooling solvent for cooling the power unit;
A liquid feed pipe having thermal conductivity piped upstream of the radiator in the circulation direction of the cooling solvent in order to circulate the cooling solvent between the power unit and the radiator;
A space that is isolated from the engine compartment room, and a housing member that houses the liquid feeding pipe in the space;
Body front structure with   The vehicle body front part structure according to claim 1, wherein a heat radiating material for radiating heat of the liquid feeding pipe is provided in the space of the housing member.   The vehicle body front part structure according to claim 1, wherein the housing member is a dash cross member attached to a dash panel that divides the engine compartment room and the vehicle compartment. The dash cross member has a curved portion that is curved upward of the vehicle body,
The vehicle body front structure according to claim 3, wherein the liquid feeding pipe is in contact with a lower wall inner surface of the bending portion and an upper wall inner surface on both sides of the bending portion.

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