JP5001242B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure, and more particularly to a vehicle body front structure in a vehicle that needs to be equipped with a heat exchanger such as a large radiator.

As a vehicle body front part structure, a structure in which a radiator for cooling an engine, a condenser for air conditioning in a vehicle interior, and the like are mounted on the front part of the vehicle body is known.
This type of vehicle body front structure is supported by a front bulkhead at the front of the vehicle body via a bracket or the like.

As such a vehicle body front part structure, one used in a slant nose vehicle in which the front end of the vehicle body is inclined is known (for example, see Patent Document 1).
Japanese Patent No. 3551461

The front structure of the vehicle body of Patent Document 1 is a device in which a heat exchanger such as a radiator or a condenser is mounted on the vehicle body with a forward inclination in order to be housed in a slant nose vehicle body having a low _CD value (air resistance coefficient). is there.

In a vehicle body front structure that supports a heat exchanger inclined forward on the vehicle body, it is common to provide brackets of a predetermined size above and below the heat exchanger to support the vehicle body side.
However, when the radiator, which is a heat exchanger, is larger and heavier than a general vehicle type, there is a limit to support by tilting the bracket to the vehicle body side.
Therefore, there is a demand for a vehicle body front structure that is optimal for a vehicle type in which the radiator is large and heavy, and the radiator needs to be tilted.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle body front structure that can support a radiator with sufficient rigidity even in a vehicle type in which the radiator is large and heavy, and the radiator needs to be inclined and attached.

  The invention according to claim 1 is a frame shape in a front view composed of a side frame extending in the vehicle front-rear direction so as to be separated from each other in the vehicle width direction to form a pair of left and right sides, and left and right side stays, an upper member, and a lower member. Vehicle body front structure comprising a front bulkhead and a radiator supported in a forward tilted position within the front bulkhead frame, the left and right side stays are connected to the upper side of which the lower end is connected to the upper surface of the side frame. The upper side of the stay and the lower side stay whose upper end is connected to the lower surface of the side frame are divided into two parts, and the upper side stay is positioned so that the lower side stay is located behind the upper side stay in the vehicle longitudinal direction. The side stay and the lower side stay are offset in the longitudinal direction of the vehicle body, and the upper member is connected to the upper side stay. Connecting the lower member to the lower side stays, it is attached to the upper portion of the radiator to the upper member, and wherein the supporting the lower portion of the radiator to the lower member.

  In the invention according to claim 2, the side frame is a member having a substantially rectangular closed cross-sectional shape, and the upper extension piece joined to one of the left and right side surfaces of the side frame is extended from the lower end of the upper side stay. The lower extension piece joined to the other of the left and right side surfaces extends from the upper end of the lower side stay, and these upper and lower extension pieces are joined to the left and right sides by offsetting in the vehicle longitudinal direction. It is characterized by being.

  According to a third aspect of the present invention, the side frame includes an intermediate wall that divides the inside of the closed cross-sectional shape into two chambers at the top and bottom, and the lower extension piece extends to a height position equivalent to the intermediate wall It is characterized by that.

  The invention according to claim 4 is characterized in that the upper extension piece and the lower extension piece have a flange portion protruding in the vehicle width direction.

  According to a fifth aspect of the present invention, the radiator includes a seat portion provided at a lower portion and a leg portion projecting from the seat portion, and the lower member includes a radiator lower support portion that supports the leg portion and the seat portion. The radiator lower support portion is composed of a mounting bracket formed in a substantially cylindrical shape with an extruded aluminum material, and a mounting member made of an elastic resin provided in a substantially cylindrical portion of the mounting bracket. Is provided with a support hole into which the seat can be inserted and a seat receiving portion with which the seat abuts.

  In the invention according to claim 6, the upper member is a member having a substantially square shape in cross-sectional view including an upper surface, a lower surface, a front surface, and a rear surface, and the radiator includes a radiator bracket that extends rearward of the vehicle body toward the upper member, The radiator bracket includes a radiator upper support portion that supports the upper portion of the radiator, first and second extending pieces that are bifurcated from the rear of the radiator upper support portion and extend to the upper member, and a first extension. A first mounting portion provided at an end of the piece and attached to the upper surface of the upper member; and a second attachment portion provided at an end of the second extending piece and attached to the front surface of the upper member. To do.

In the first aspect of the present invention, the vehicle body front structure includes a side frame extending in the vehicle front-rear direction so as to be separated from each other in the vehicle width direction so as to form a pair of left and right sides, left and right side stays, upper members, and lower members. The front bulkhead has a frame shape when viewed from the front, and a radiator that is supported in a forward tilted posture within the frame of the front bulkhead.
The left and right side stays are divided into upper and lower parts from an upper side stay whose lower end is connected to the upper surface of the side frame and a lower side stay whose upper end is connected to the lower surface of the side frame.
For example, in a sports-type vehicle, a large and heavy radiator is often placed in a forward leaning posture due to design restrictions. Considering G (acceleration) applied during high-speed traveling and the weight of the radiator itself, a portion supporting the radiator needs to have a considerable rigidity.
Therefore, the upper side stay and the lower side stay are offset in the vehicle longitudinal direction so that the lower side stay is located rearward with respect to the vehicle longitudinal direction relative to the upper side stay, and the upper member is coupled to the upper side stay, The lower member is connected to the lower side stay, the upper part of the radiator is attached to the upper member, and the lower part of the radiator is supported by the lower member. Can be firmly placed in a forward tilting posture.

In the invention according to claim 2, the side frame has a substantially rectangular closed cross-sectional shape. The upper extension piece joined to one of the left and right side surfaces of the side frame extends from the lower end of the upper side stay, and the lower extension piece joined to the other of the left and right side surfaces extends from the upper end of the lower side stay. These upper and lower extension pieces were joined to the left and right side surfaces while being offset in the longitudinal direction of the vehicle body.
Therefore, when the upper and lower side stays are joined to the side frame by welding, the deformation due to heat on the left and right side surfaces of the side frame and the change in rigidity of the welded portion are balanced on the left and right, and the side frame is moved by a frontal collision or the like. When crushing, the side frame can be deformed in a balanced manner on the left and right.
In addition, by joining the upper and lower side stays to the left and right side surfaces of the side frame via the upper and lower extension pieces, the load that shakes the front part of the vehicle body that occurs during cornering is applied to the upper and lower sides. It can be converted into a load that twists the side stay and transmitted to the side frame.

  In the invention according to claim 3, the side frame includes an intermediate wall that divides the inside of the closed cross-sectional shape into two chambers at the top and bottom, and the lower extension piece extends to a height position equivalent to the intermediate wall. Thus, the load from the lower extension piece can be transmitted to the intermediate wall, and the load can be transmitted to the entire side frame more efficiently.

  In the invention which concerns on Claim 4, since an upper side extension piece and a lower side extension piece have the flange part which protrudes in a vehicle width direction, the rigidity of an upper side extension piece and a lower side extension piece can be improved. The transmission of the load to the side frame can be ensured.

In the invention which concerns on Claim 5, the radiator is provided with the seat part provided in the lower part, and the leg part protruded from this seat part, The lower member is equipped with the radiator lower part support part which supports a leg part and a seat part. .
Since the radiator lower support portion is composed of a mounting bracket formed in a substantially cylindrical shape by an aluminum extruded material and a mounting member made of an elastic resin provided inside the substantially cylindrical portion of the mounting bracket, the radiator lower support portion Molding can be facilitated, and the depth of the radiator lower support portion can be arbitrarily adjusted. Further, since the radiator is supported via the elastic resin mount member, vibration transmitted to the radiator can be reduced.
Since the mount member is provided with the support hole into which the leg portion can be inserted and the seat portion receiving portion with which the seat portion abuts, the supportability of the radiator can be improved.

In the invention according to claim 6, the upper member is a member having a substantially square shape in a sectional view including an upper surface, a lower surface, a front surface, and a rear surface, and the radiator includes a radiator bracket that extends rearward of the vehicle body toward the upper member.
The radiator bracket includes a radiator upper support portion that supports the upper portion of the radiator, first and second extending pieces that are bifurcated from the rear of the radiator upper support portion and extend to the upper member, and a first extending piece. The first mounting portion that is provided at the end of the upper member and is attached to the upper surface of the upper member, and the second mounting portion that is provided at the end of the second extending piece and is attached to the front surface of the upper member. Can be received at two locations of the first and second mounting portions, and the support rigidity of the radiator can be improved.
In addition, the radiator bracket is provided with a first attachment portion that is attached to the upper surface of the upper member and a second attachment portion that is attached to the front surface of the upper member, so that the radiator can be supported by different surfaces of the upper member. It is effective against the load in the direction and the load in the vehicle body height direction.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a vehicle body employing a vehicle body front structure according to the present invention.
The vehicle body 12 includes left and right side frames 14 and 14 extending in the vehicle front-rear direction so as to be separated from each other in the vehicle width direction so as to form a pair of left and right sides, and a front bulk configured around the front ends of these side frames 14 and 14. Provided between the head 16, the left and right side upper members 25, 25 extending from the front bulkhead 16 to the rear of the vehicle body, and the rear portions of the side upper members 25, 25 and the left and right side frames 14, 14. A skeleton of the front body is formed with the left and right damper housings 24, 24 supporting the front damper (not shown) as main components.

  The front bulkhead 16 includes left and right side stays 33 and 33 attached to the left and right side frames 14 and 14, an upper member 31 passed over the left and right side stays 33 and 33, and left and right side stays 33 and 33. The lower member 32 is passed to the lower part of the lower member. Further, the front bulkhead 16 is also a frame (frame portion) having a rectangular frame shape when viewed from the front and formed of an aluminum extruded material.

  2 is a perspective view of the vehicle body front structure according to the present invention, FIG. 3 is a perspective view showing a state in which the side frame of the vehicle body front structure shown in FIG. 2 is removed, and FIG. 4 is shown in FIG. 5 is a side view showing a side frame and an upper side stay of the vehicle body front structure shown in FIG. 2, and FIG. 6 is a side view of the vehicle body front structure shown in FIG. It is a bottom view.

  As shown in FIG. 2, the side frame 14 is a member having a substantially rectangular closed cross-sectional shape composed of an upper surface 14 a, a lower surface 14 b, and left and right side surfaces 14 c and 14 d. An intermediate wall 41 is provided that is divided into two chambers.

  As shown in FIGS. 4 and 6, the upper member 31 is a member formed of an aluminum extruded material having a substantially square shape in cross section, which includes an upper surface 31a, a lower surface 31b, a front surface 31c, and a rear surface 31d. The lower member 32 is a member formed of an aluminum extruded material.

  As shown in FIGS. 2 and 3, the side stay 33 has a lower end whose upper end is connected to the upper surface 14a of the side frame 14 and a lower end whose upper end is connected to the lower surface 14b of the side frame 14, respectively. The side side stay 36 is vertically divided into two parts.

  The arrangement structure of the upper and lower side stays 35 and 36 is such that the upper side stay 35 and the lower side stay 36 are arranged on the vehicle body such that the lower side stay 36 is positioned rearward with respect to the longitudinal direction of the vehicle body relative to the upper side stay 35. They are arranged offset by a distance S1 (see FIG. 8 described later) in the front-back direction.

  The upper side stay 35 is connected to the upper member 31, and the lower side stay 36 is connected to the lower member 32. Further, as shown in FIG. 7 to be described later, the upper part of the radiator 52 is attached to the upper member 31, and the lower part of the radiator 52 is supported by the lower member 32.

  As shown in FIG. 5, the upper side stay 35 extends from the lower end with an upper extension piece 42 joined to one of the left and right side surfaces 14 c and 14 d of the side frame 14, and the lower side stay 36 is As shown in FIG. 2 and FIG. 3, a lower extension piece 43 joined to the other of the left and right side surfaces 14 c and 14 d of the side frame 14 extends from the upper end.

Further, as shown in FIG. 2, the upper and lower extending pieces 42, 43 are joined to the left side surface 14c while being offset in the vehicle body front-rear direction.
The upper extending piece 42 has flange portions 44 and 44 that protrude in the vehicle width direction.
The lower extension piece 43 has flange portions 45 and 45 projecting in the vehicle width direction, and extends to a height position equivalent to the intermediate wall 41 of the side frame 14 as shown in FIG. .

  In the vehicle body front part structure, the upper extension piece 42 and the lower extension piece 43 have flange portions 44 and 44 and flange portions 45 and 45 projecting in the vehicle width direction. The rigidity of the protruding piece 43 can be improved, and the transmission of the load to the side frame 14 can be ensured.

As shown in FIG. 6, the side frame 14 is mounted with a front sub-chassis 47 in which an engine (not shown) and a front suspension (not shown) are incorporated behind the front bulkhead 16.
An auxiliary member 48 is passed from the front sub chassis 47 to the lower side stay 36. Therefore, a load is generated from the auxiliary member 48 to the lower side stay 36 so as to swing the front part of the vehicle body from side to side.

  In the vehicle body front structure, the side frame 14 includes an intermediate wall 41 that divides the inside of the closed cross-sectional shape into two chambers at the top and bottom, and the lower extension piece 43 reaches a height position equivalent to the intermediate wall 41. Since it is extended, the load from the lower extension piece 43 can be transmitted to the intermediate wall 41, and the load can be transmitted to the entire side frame 14 more efficiently.

  That is, as shown in FIGS. 1 to 3, the vehicle body front portion structure includes side frames 14, 14 that extend in the vehicle front-rear direction so that they are separated from each other in the vehicle width direction to form a pair of left and right sides. A front bulkhead 16 having a frame shape in a front view composed of side stays 33, 33, an upper member 31, and a lower member 32, and a radiator 52 (see FIG. 7) supported in a forward inclined posture within the frame of the front bulkhead 16. ).

  The side stay 33 is configured by dividing the upper side stay 35 in the vertical direction from an upper side stay 35 whose lower end is connected to the upper surface 14 a of the side frame 14 and a lower side stay 36 whose upper end is connected to the lower surface 14 b of the side frame 14. The

  For example, in a sports-type vehicle, a large and heavy radiator is often placed in a forward leaning posture due to design restrictions. Considering the G (acceleration) applied during high-speed traveling and the weight of the radiator itself, the portion that supports the radiator 52 needs to have considerable rigidity.

  Therefore, the upper side stay 35 and the lower side stay 36 are offset in the vehicle body longitudinal direction so that the lower side stay 36 is positioned rearward with respect to the vehicle body longitudinal direction with respect to the upper side stay 35, and the upper member is moved to the upper side stay 35. 31, the lower member 32 is connected to the lower side stay 36, the upper part of the radiator 52 is attached to the upper member 31, and the lower part of the radiator 52 is supported by the lower member 32, so that the load of the radiator 52 is applied to the skeleton member of the vehicle body The large and heavy radiator 52 can be firmly placed in a forward leaning posture.

  In the vehicle body front part structure, the side frame 14 exhibits a substantially rectangular closed cross-sectional shape. An upper extension piece 42 joined to one of the left and right side surfaces 14c and 14d of the side frame 14 extends from the lower end of the upper side stay 35, and extends from the upper end of the lower side stay 36 to the other of the left and right side surfaces 14c and 14d. The lower extension piece 43 to be joined was extended, and the upper and lower extension pieces 42 and 43 were joined to the left and right side surfaces 14c and 14d while being offset in the longitudinal direction of the vehicle body.

  Therefore, when the upper and lower side stays 35, 36 are joined to the side frame 14 by welding, the left and right side surfaces 14c, 14d of the side frame 14 are deformed by heat and the rigidity change of the welded portion is balanced on the left and right. When the side frame 14 is crushed by a frontal collision or the like, the side frame 14 can be deformed in a balanced manner on the left and right.

  Further, the upper and lower side stays 35 and 36 are joined to the left and right side surfaces 14c and 14d of the side frame 14 via the upper and lower extending pieces 42 and 43, so that the front part of the vehicle body generated at the corner can be reduced. The swinging load can be converted into a load that twists the upper and lower side stays 35 and 36 and transmitted to the side frame 14.

7 is a perspective view of the vehicle body front structure radiator shown in FIG. 2 mounted thereon, and FIG. 8 is a side view of the vehicle body front structure shown in FIG.
As shown in FIGS. 1, 7 and 8, in the vehicle body front structure, side frames 14, 14 extending in the vehicle front-rear direction so as to be spaced apart from each other in the vehicle width direction, A front bulkhead 16 having a frame shape in a front view composed of side stays 33, 33, an upper member 31 and a lower member 32, and a heat exchanger 51 supported in a forward inclined posture within the frame of the front bulkhead 16. Composed.

  The heat exchanger 51 includes a radiator 52 that cools an engine (not shown), a condenser 53 that is placed in front of the radiator 52 and is used for air conditioning, and a fan unit 54 that is provided behind the radiator 52 and sends air to the radiator 52. (See also FIG. 13 described later).

  That is, in the vehicle body front part structure, the upper side stay 35 and the lower side stay 36 are offset in the vehicle longitudinal direction so that the lower side stay 36 is positioned rearward with respect to the vehicle longitudinal direction relative to the upper side stay 35. An upper part of the radiator 52 is attached to the upper member 31, and a lower part of the radiator 52 is supported by the lower member 32, and the large and heavy radiator 52 (heat exchanger 51) is moved forward by the lower member 32, which is a skeleton member of the vehicle body. It can be firmly placed in an inclined posture.

FIG. 9 is a perspective view showing an upper portion of the radiator of the vehicle body front part structure shown in FIG.
An upper pin 56 is formed on the upper portion of the radiator 52. One end of the radiator bracket 61 is fitted to the upper pin 56, and the other end of the radiator bracket 61 is attached to the upper member 31 to be supported.

  The radiator bracket 61 includes a radiator upper support portion 63 fitted to an upper pin 56 of the radiator 52 via a grommet 62 formed of an elastic member, and a bifurcated branch from the rear of the radiator upper support portion 63 to the upper member 31. First and second extending pieces 64 and 65, a first attaching portion 66 provided at an end of the first extending piece 64 and attached to the upper surface 31a of the upper member 31, and a second extending piece. A second attachment portion 67 that is provided at the end portion of the protruding piece 65 and is attached to the front surface 31 c of the upper member 31 is formed.

  The first attachment portion 66 is attached to the upper surface 31 a of the upper member 31 with a first bolt 68, and the second attachment portion 67 is attached to the front surface 31 c of the upper member 31 with a second bolt 69.

  In the vehicle body front structure, the upper member 31 is formed in a substantially quadrangular shape in a sectional view including an upper surface 31a, a lower surface 31b, a front surface 31c, and a rear surface 31d. At the top.

  The radiator bracket 61 includes a radiator upper support portion 63 that supports the upper portion of the radiator 52, and first and second extending pieces 64 and 65 that are bifurcated from the rear of the radiator upper support portion 63 and extend to the upper member 31. And a first attachment portion 66 attached to the upper surface 31a of the upper member 31 and an end portion of the second extension piece 65 provided at the end of the first extension piece 64, and the front surface 31c of the upper member 31. The second mounting portion 67 attached to the radiator 52 can receive the tensile load in the falling direction of the radiator 52 at the two locations of the first and second mounting portions 66 and 67, and the support rigidity of the radiator 52 can be increased. Can be improved.

Further, the radiator bracket 61 is provided with a first attachment portion 66 attached to the upper surface 31 a of the upper member 31 and a second attachment portion 67 attached to the front surface 31 c of the upper member 31, so that the radiator 52 is mounted on a different surface of the upper member 31. And is effective against a load in the longitudinal direction of the vehicle body and a load in the vehicle body height direction.
In the vehicle body front part structure shown in FIG. 2 in which the upper member 31 of the front bulkhead 16 is formed of an aluminum extruded material, the effect can be exhibited particularly.

  10 is a perspective view showing a lower portion of the front bulkhead of the vehicle body front structure shown in FIG. 7, and FIG. 11 is a perspective view showing a radiator lower support portion of the vehicle body front structure shown in FIG. FIG. 13 is a side view of the radiator of the vehicle body front structure shown in FIG. 7, and FIG. 13 is an enlarged view of part 13 in FIG.

  As shown in FIGS. 12 and 13, a lower portion of the radiator 52 is formed with a seat portion 58 that is horizontal when tilted forward. A leg portion (lower pin) 57 is formed on the seat portion 58 in the vehicle body vertical direction. And is supported by a radiator lower support portion 73 formed on the lower member 32 of the front bulkhead 16.

As shown in FIGS. 10 and 11, the radiator lower support portion 73 includes a mounting bracket 74 formed in an approximately cylindrical shape by an aluminum extruded material, and an elastic resin made in an approximately cylindrical interior of the mounting bracket 74. Mounting member 75.
The mount member 75 is provided with a support hole 76 into which the leg portion 57 can be inserted, and a seat portion receiving portion 77 with which the seat portion 58 abuts.

  In the vehicle body front structure, the radiator lower support portion 73 includes a mounting bracket 74 formed in a substantially cylindrical shape by an aluminum extruded material, and a mounting member 75 made of an elastic resin provided inside the substantially cylindrical portion of the mounting bracket 74. Since it comprised, the shaping | molding of the radiator lower support part 73 can be performed easily, and the depth of the radiator lower support part 73 can be adjusted arbitrarily. Further, since the radiator 52 is supported via the elastic resin mount member 75, vibration transmitted to the radiator 52 can be reduced.

  Since the mount member 75 is provided with the support hole 76 into which the leg portion 57 can be inserted and the seat portion receiving portion 77 with which the seat portion 58 abuts, the supportability of the radiator 52 can be improved.

  The vehicle body front structure according to the present invention is a vehicle body front structure in which the side frame 14 and the front bulkhead 16 are formed of an aluminum extruded material as shown in FIG. 1, but is not limited thereto. It does not preclude adoption in a vehicle body front structure composed of sheet metal pressed parts.

  The vehicle body front structure according to the present invention is suitable for use in passenger cars such as sedans and wagons.

It is a perspective view of the vehicle body which employ | adopted the vehicle body front part structure which concerns on this invention. It is a perspective view of the vehicle body front part structure concerning the present invention. FIG. 3 is a perspective view showing a state where a side frame of the vehicle body front part structure shown in FIG. 2 is removed. It is a front view of the vehicle body front part structure shown by FIG. FIG. 3 is a side view showing a side frame and an upper side stay of the vehicle body front part structure shown in FIG. 2. FIG. 3 is a bottom view of the vehicle body front structure shown in FIG. 2. FIG. 3 is a perspective view of a state where the radiator having the vehicle body front structure shown in FIG. 2 is mounted. It is a side view of the vehicle body front part structure shown by FIG. It is a perspective view which shows the radiator upper part of the vehicle body front part structure shown by FIG. It is a perspective view which shows the front bulkhead lower part of the vehicle body front part structure shown by FIG. It is a perspective view which shows the radiator lower part support part of the vehicle body front part structure shown by FIG. It is a side view of the radiator of the vehicle body front part structure shown by FIG. FIG. 13 is an enlarged view of part 13 in FIG. 12.

Explanation of symbols

  14 ... side frame, 14a ... upper surface, 14b ... lower surface, 14c, 14d ... left and right side surfaces, 16 ... front bulkhead, 31 ... upper member, 31a ... upper surface, 31b ... lower surface, 31c ... front surface, 31d ... rear surface, 32 ... lower member 35, 36 ... upper and lower side stays, 41 ... intermediate wall, 42, 43 ... upper and lower extension pieces, 44, 45 ... flange part, 52 ... radiator, 57 ... leg part, 58 ... seat part, 61 ... Radiator bracket, 63 ... Radiator upper support, 64,65 ... First and second extension pieces, 66,67 ... First and second mounting parts, 73 ... Radiator lower support, 74 ... Mount bracket 75 ... mount member, 76 ... support hole, 77 ... seat receiving part.

Claims (6)

A side frame extending in the vehicle front-rear direction so as to be separated from each other in the vehicle width direction to form a pair of left and right sides, a front bulkhead having a frame shape in a front view composed of left and right side stays, an upper member, and a lower member; In the front structure of the vehicle body consisting of a radiator supported in a forward leaning posture within the frame of the front bulkhead,
The left and right side stays are divided into upper and lower parts from an upper side stay whose lower end is connected to the upper surface of the side frame and a lower side stay whose upper end is connected to the lower surface of the side frame, and
The upper side stay and the lower side stay are offset in the vehicle longitudinal direction so that the lower side stay is located rearward in the vehicle longitudinal direction with respect to the upper side stay, and the upper member is coupled to the upper side stay. , Connecting a lower member to the lower side stay,
A vehicle body front part structure in which an upper part of the radiator is attached to the upper member and a lower part of the radiator is supported by the lower member. The side frame is a member having a substantially rectangular closed cross-sectional shape,
An upper extension piece joined to one of the left and right side surfaces of the side frame extends from the lower end of the upper side stay, and a lower extension joined to the other of the left and right side surfaces from the upper end of the lower side stay. The protruding piece is extended,
The vehicle body front part structure according to claim 1, wherein the upper and lower extension pieces are joined to the left and right side surfaces while being offset in the vehicle front-rear direction. The side frame includes an intermediate wall that divides the inside of the closed cross-sectional shape into two chambers at the top and bottom,
The vehicle body front part structure according to claim 2, wherein the lower extension piece extends to a height position equivalent to the intermediate wall.   The vehicle body front part structure according to claim 2 or 3, wherein the upper extension piece and the lower extension piece have a flange portion protruding in a vehicle width direction. The radiator includes a seat portion provided at a lower portion and a leg portion protruding from the seat portion, and the lower member includes a radiator lower support portion that supports the leg portion and the seat portion,
The radiator lower support portion includes a mounting bracket formed in a substantially cylindrical shape with an extruded aluminum material, and a mounting member made of an elastic resin provided in a substantially cylindrical interior of the mounting bracket. The vehicle body front part structure according to claim 1, further comprising a support hole into which the leg portion can be inserted and a seat portion receiving portion with which the seat portion abuts. The upper member is a substantially quadrangular member in cross-sectional view consisting of an upper surface, a lower surface, a front surface, and a rear surface, and the radiator includes a radiator bracket that extends rearward of the vehicle body toward the upper member,
The radiator bracket includes a radiator upper support portion that supports an upper portion of the radiator, first and second extending pieces that are bifurcated from the rear of the radiator upper support portion and extend to the upper member, and the first bracket. A first mounting portion provided at an end portion of the extending member and attached to the upper surface of the upper member; and a second mounting portion provided at an end portion of the second extending piece and attached to the front surface of the upper member; The vehicle body front part structure according to any one of claims 1 to 5, characterized by comprising:

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