JP5205905B2 - Front body structure of automobile - Google Patents

Description

  The present invention relates to a structure around a wheel house in a front part of a vehicle body, and belongs to the technical field of a vehicle body structure.

  A pair of left and right front side frames extending in the front-rear direction of the vehicle body through the side of the wheel house are provided at the front of the vehicle body. Then, when an impact load is input from the front of the vehicle to the front end of the front side frame, the rear end of the front side frame is connected to the front end of the floor frame so that the impact load can be distributed to the rear of the vehicle body. Although the floor frame is generally disposed at a lower position than the front side frame, the rear side of the front side frame is bent downward and connected to the front end of the floor frame. .

  However, when configured in this way, when an impact load is input to the front end portion of the front side frame, there is a possibility that the bending portion may be broken. One end is connected to the side part of the suspension tower part (the part in which the suspension in the wheel house is accommodated) in the side frame, and the other end part extends rearward and upward along the surface on the engine room side of the panel constituting the suspension tower. In addition, there is disclosed one provided with an auxiliary frame connected to a vehicle body member behind the suspension tower.

JP 2003-182633 A

By the way, behind the wheel house, for example, a device such as a master cylinder of a brake may be disposed so as to protrude from the dash panel to the wheel house side. It may be difficult to provide such an auxiliary frame .

  Therefore, an object of the present invention is to provide a front body structure of an automobile in which an auxiliary frame can be provided even when a sufficient space cannot be secured behind the wheel house.

  In order to solve the above-described problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application is in contact with the inner end of the wheel house in the vehicle width direction and extends in the longitudinal direction of the vehicle body, and the rear side is curved downward, and the rear end is connected to the floor frame. An automobile provided with a front side frame, and an auxiliary frame having a front end connected to a side portion of the wheel house of the front side frame, extending rearwardly, and having a rear end connected to a vehicle body member behind the wheel house The vehicle body member is a dash panel, hinge pillars are provided on the left and right sides of the dash panel, and the left and right hinge pillars are connected to the rear surface of the dash panel by extending in the vehicle width direction. A dash cross member is formed, and the dash cross member and the rear surface of the dash panel form a closed cross-sectional structure, and the auxiliary frame The front member is divided into a front member and a rear member, and the front member is provided on the surface of the engine room side of the panel forming the wheel house. It is provided on the surface of the panel opposite to the engine room so as to overlap the end, and the rear part of the rear member of the auxiliary frame is a flange part of the rear end of the rear member, the dash panel, The flange portion of the dash cross member is coupled to the dash cross member through the dash panel by fastening together with a bolt and a nut .

Further, an invention according to claim 2, in front body structure for an automobile according to claim 1, side member after said auxiliary frame until the suspension support portion rear is provided on the upper portion of the wheel house It is characterized by expansion.

  The invention according to claim 3 is the front vehicle body structure of the vehicle according to claim 2, further comprising a connecting member for connecting the dash panel and the suspension support portion in the vehicle longitudinal direction. The connecting member and the rear side of the rear member of the auxiliary frame form a closed cross-sectional structure extending from the dash panel to the suspension support portion.

  Next, the effect of the present invention will be described.

First, according to the first aspect of the present invention, the auxiliary frame is divided into a front member and a rear member, and the front member is provided on the engine room side surface of the panel forming the wheel house. The rear member is provided on the surface of the panel opposite to the engine room so that the front end portion overlaps the rear end portion of the front member, so that the rear half portion of the auxiliary frame does not protrude toward the engine room side of the wheel house. . Therefore, even if an auxiliary frame is provided, it is possible to avoid interference between the auxiliary frame and, for example, a master cylinder of a brake device disposed behind the wheel house. And it is possible to satisfactorily prevent the front side frame from being bent by the auxiliary frame .

According to the present invention, the dash panel is provided with hinge pillars on the left and right sides, and the dash cross member that extends in the vehicle width direction and connects the left and right hinge pillars to form a closed cross-sectional structure with the rear surface of the dash panel. The rear portion of the rear member of the auxiliary frame is connected to the dash cross member via a dash panel, so that a load acting on the auxiliary frame from the front side frame is transmitted via the dash cross member. It can also be dispersed in the hinge pillar. Therefore, even when the impact load is larger, the front side frame can be favorably suppressed from being bent.

According to the invention described in claim 2, the rear member of the auxiliary frame extends from the front side frame to the auxiliary frame because the rear portion extends to the suspension support portion provided at the upper portion of the wheel house. The acting impact load can be distributed to the dash panel and the suspension support. Therefore, even when the impact load is larger, the front side frame can be favorably suppressed from being bent.

According to the invention described in claim 3, the connecting member for connecting the dash panel and the suspension support portion in the longitudinal direction of the vehicle body is provided, and the connecting member and the rear side of the rear member of the auxiliary frame are provided. Thus, since the closed cross-sectional structure extending from the dash panel to the suspension support portion is configured, the rigidity between the dash panel and the suspension support portion of the wheel house is improved.

  Hereinafter, a front body structure of an automobile according to an embodiment of the present invention will be described.

  As shown in FIG. 1, in the automobile 1 according to the present embodiment, the left and right ends of the dash panel 2 are respectively extended in the vertical direction and hinge pillars 3 (only one is shown) on which the front door is pivotally supported. ) Is provided.

  Apron reinforcements 4 and 4 extend forward from the upper ends of the left and right hinge pillars 3, respectively.

  Front side frames 5 and 5 extend in the longitudinal direction of the vehicle body at positions spaced substantially in parallel to the apron reinforcements 4 and 4 in a plan view and inward in the vehicle width direction. Each front side frame 5 forms a closed cross-sectional structure extending in the longitudinal direction of the vehicle body by an outer member and an inner member having a hat-shaped cross section.

  A wheel house 6 for front wheels is provided between the apron reinforcement 4 and the front side frame 5 in the vehicle width direction.

  A plate 7 is attached to the front end portions of the front side frame 5 and the apron reinforcement 4 so as to straddle them, and between the left and right plates 7, 7 is compressed and deformed when a longitudinal impact load is input. A bumper reinforcement 9 is attached via the crash boxes 8 and 8.

  The lower portion of the dash panel 2 is curved rearward, and the lower end portion is joined to the front end portion of the floor panel 10. The lower portion of the dash panel 2 and the floor panel 10 are provided with a tunnel portion 11 that extends in the front-rear direction at the approximate center in the vehicle width direction and bulges upward.

  The rear side of the front side frame 5 is curved downward on the side of the wheel house 6, and the rear end is connected to the front end of the floor frame 12 that extends in the vehicle longitudinal direction on the lower surface side of the floor panel 10. The floor frame 12 forms a closed cross section that extends in the longitudinal direction of the vehicle body with the floor panel 10.

  The front surface of the dash panel 2 (the surface on the engine room 13 side) extends along the front end portion of the tunnel portion 11 between the left and right front side frames 5 and 5, and as shown in FIG. A lower dash cross member 14 having a hat-shaped cross section constituting a closed cross-sectional structure is provided.

As shown in FIGS. 2 and 3, an upper dash cross member 16 having a hat-shaped cross section extending in the vehicle width direction is provided on an upper portion of the rear surface (surface on the vehicle compartment 15 side) of the dash panel 2. The upper dash cross member 16 is connected at its left and right ends to an inner panel 18 constituting the inner surface of the hinge pillar 3 via a gusset 17 having substantially the same cross-sectional shape as the member 16 (the dash cross member in claim 1). Is composed of an upper dash cross member 16 and a gusset 17). In detail, the gusset 17 is fastened to the inner panel 18 by bolts and nuts B1 and B1 at the rear ends of the upper and lower flanges 17a and 17a, and the flange 16a at the front end of the flange 17a is the end of the upper dash cross member 16. Together with the dash panel 2 and a flange 32g of the rear end portion of the rear member 32 of the auxiliary frame 30 described later, the bolt and nut B2 are tightened together. As a result, the dash panel 2, the upper dash cross member 16, and the gusset 17 form a closed cross-sectional structure X that extends in the vehicle width direction between the left and right hinge pillars 3 and 3.

  As shown in FIGS. 1 and 2, the wheel house 6 includes a wheel house inner having an outer end in the vehicle width direction joined to the apron reinforcement 4 and an inner end in the vehicle width direction joined to the front side frame 5. A suspension tower 6a (19a) that accommodates a suspension damper, a coil spring, and the like is formed on the upper portion of the rear portion of the panel 19 in an arch shape. It is formed by protruding upward and inward in the vehicle width direction. As shown in FIG. 4, suspension support members 21 and 22 for supporting the upper arm of the suspension are attached to the surface on the side opposite to the engine room 13 of the suspension tower portion 6 a portion of the wheel house inner panel 19.

  As shown in FIG. 5, the dash panel 2 and the top portion 6 a ′ (suspension support portion) of the suspension tower portion 6 a to which the upper end portion of the suspension damper or the like is fixed are positioned at the height position of the upper dash cross member 16. A first connection panel 41 that is connected in the longitudinal direction of the vehicle body is provided. The rear portion of the first connection panel 41 with respect to the suspension tower portion 6a is constituted by a substantially horizontal lateral surface portion 41a, and a flange 41b provided at the rear end portion is provided below the upper dash cross member 16 on the dash panel 2. It is overlapped and joined to the flange 16a on the side.

  2 and 5, between the dash panel 2 and the top portion 6a 'of the suspension tower 6a, the left and right apron reinforcements 4 and 4 above the first connection panel 41 and A cowl portion 50 is provided for connecting the hinge pillars 3 and 3 in the vehicle width direction.

  The cowl portion 50 includes a cowl front panel 51 that has left and right ends extending forward and joined to the top portion 6a 'of the suspension tower 6a, a dash upper panel 52 provided above the dash panel 2, and the dash A rear portion is joined to the upper panel 52 and a cowl panel 54 that supports the front end portion of the windshield 53 is formed.

  As shown in FIG. 5, a second connection panel 42 is provided between the end portion of the cowl front panel 51 and the end portion of the dash upper panel 52 to connect them in the front-rear direction. The second connection panel 42 is joined to the reinforcement 4 at the end on the apron reinforcement 4 side. The second connection panel 42 is provided for attaching a wiper, but also has a function as a reinforcing member in the front-rear direction.

By the way, the front side frame 5 is curved downward on the rear side as described above, but it is necessary to prevent the curved portion from being bent when an impact load is input to the front end portion of the front side frame 5. There is.

  Therefore, in the present embodiment, as shown in FIG. 2, the front end is connected to the side portion of the suspension tower 6 a of the wheel house 6 in the front side frame 5, extends rearward, and the rear end is An auxiliary frame 30 connected to the rear portion of the wheel house 6 in the dash panel 2 (vehicle body member) is provided.

  In that case, in the vehicle according to the present embodiment, as shown in FIGS. 2 and 3, the front surface of the dash panel 2 is in front of the driver's seat and behind the wheel house 6. 60 is attached, but the front portion of the master cylinder 60 is close to the suspension tower portion 6a of the wheel house 6 in the attached state. Therefore, it is difficult in terms of space to provide all of the auxiliary frame 30 on the surface of the wheel house inner panel 19 on the engine room 13 side.

  Therefore, in the present embodiment, the auxiliary frame 30 is divided into the front side member 31 and the rear side member 32, and the front side member 31 is provided on the surface of the wheel house inner panel 19 on the engine room 13 side. The member 32 is provided on the surface of the panel 19 on the side opposite to the engine room 13.

  This structure will be described in detail. The front member 31 extends rearwardly up to a position separated from the front end of the master cylinder 60 by a predetermined amount along the surface of the wheel house inner panel 19 on the engine room 13 side. Further, the front member 31 has a hat-shaped cross section having flange portions 31a and 31a on both side portions. However, the front end portion and the lower end portion have no protrusions and are formed as flange portions 31b and 31c. Yes. The front end portion (lower end portion) flange portion 31b is joined to the upper surface 5a and the side surface 5b of the inner member of the front side frame 5, and the side flange portions 31a, 31a are upper flange portions of the inner member of the front side frame 5. 5c and the outer vertical surface portion 19b of the wheel house inner panel 19 are joined, and the flange portion 31c at the rear end portion (upper end portion) is joined to the vertical surface portion 19b.

  On the other hand, as shown in FIG. 4, the rear member 32 extends substantially rearwardly up along the surface of the wheel house inner panel 19 on the side opposite to the engine room 13, and the rear end of the rear member 32 is in the dash panel 2. It is connected to the rear part of the wheel house 6.

  More specifically, the rear member 32 includes a front portion 32a provided on the lower surface side of the inclined surface portion 19c extending obliquely outward in the vehicle width direction from the upper end of the outer vertical surface portion 19b of the wheel house inner panel 19, and a rear side thereof. The front portion 32a has a hat-shaped cross section in which flange portions 32h and 32h are provided on both sides, and these flange portions 32h and 32h are wheel house inner panels. 19 is joined to the inner inclined surface portion 19c.

  As shown in FIG. 6, the rear member 32 is provided so that the front end portion overlaps the rear end portion (upper end portion) of the front member 31. This is intended to ensure sufficient strength of the connecting portion between the front member 31 and the rear member 32.

On the other hand, as can be seen from FIGS . 2, 4 , and 5, the rear portion 32 b of the rear member 32 is connected to the rear portion of the wheel house 6 in the dash panel 2 while the rear end portion is connected to the rear portion of the dash panel 2. It has the extended part 32c extended to top part 6a 'vicinity of the tower part 6a. The rear portion 32b includes a lower surface portion 32d, a side surface portion 32e, and a front surface portion 32f that are formed so as to be continuous with the front cross-sectional hat shape, and a flange portion provided on the periphery of these surface portions 32d, 32e, and 32f. 32g, and the flange portion 32g is an outer vertical surface portion 19d of the wheel house inner panel 19, the dash panel 2, the first connection panel 41, and the top portion 6a 'of the suspension tower portion 6a of the wheel house inner panel 19. It is joined across the parts. As a result, as shown in FIG. 5, the first connecting panel 41 and the rear portion 32b of the rear member 32 of the auxiliary frame 30 are closed from the dash panel 2 to the top portion 6a ′ of the suspension tower portion 6a. A cross-sectional structure Y is formed.

  The rear end portion of the rear portion 32b of the rear portion 32b of the auxiliary frame 30 attached to the dash panel 2 includes the dash panel 2, the flange portions 16a and 17a of the upper dash cross member 16 and the gusset 17. At the same time, they are fastened together with bolts and nuts B2. As a result, the rear member 32 is connected to the upper dash cross member 16 via the dash panel 2.

  Next, the operation of this embodiment will be described.

  That is, when a frontal collision or the like occurs in the automobile and an impact load is input to the bumper reinforcement 9 from the front, the impact load is input to the front side frames 5 and 5 while the crash box 8 is compressively deformed.

  In that case, since the rear end portion of the front side frame 5 is connected to the floor frame 12, the impact load is also distributed to the rear portion of the vehicle body.

  Further, in the present embodiment, a front end portion is connected to a portion of the front side frame 5 on the side of the wheel house 6, extends rearward and the rear end portion is connected to a portion of the dash panel 2 behind the wheel house 6. Since the auxiliary frame 30 is provided, the impact load is also distributed to the dash panel 2 through the auxiliary frame 30. Therefore, the bending deformation of the frames 5 and 5 when an impact load is input to the front side frame 5 is satisfactorily suppressed.

  Further, since the rear portion 32b of the rear member 32 of the auxiliary frame 30 is connected to the upper dash cross member 16 via the dash panel 2, an impact load input from the front side frame 5 to the auxiliary frame 30 is applied. The upper pillars 3 are also distributed to the hinge pillars 3 via the upper dash cross members 16. Therefore, even when the impact load is larger, the bending deformation of the front side frame 5 is satisfactorily suppressed.

  The rear member 32 of the auxiliary frame 30 extends from the front side frame 5 to the auxiliary frame 30 because the rear portion 32b extends to the top portion 6a '(suspension support portion) of the suspension tower 6a of the wheel house 6. The applied impact load is distributed to the dash panel 2 and the top portion 6a 'of the suspension tower 6a. Therefore, even when the impact load is larger, the bending deformation of the front side frame 5 is satisfactorily suppressed.

  The dash panel 2 and the top portion 6 a ′ of the suspension tower 6 a are provided with a first connection panel 41 (connection member) that connects the front and rear directions of the vehicle body. Since the closed section structure Y extending from the dash panel 2 to the top portion 6a 'of the suspension tower 6a is formed by the rear portion 32b of the side member 32, the space between the dash panel 2 and the top portion 6a' of the suspension tower 6a is formed. The rigidity will be improved. Therefore, the vehicle body during this period is hardly compressed back and forth, and as a result, the curved portion of the front side frame 5 positioned below the front side frame 5 is hardly compressed back and forth, and bending deformation is less likely to occur.

  Since the front side frame 5 is also connected to the other front side frame 5 via the lower dash cross member 14 at the rear side, a relatively strong impact load is input to one of the front side frames 5. Even in this case, since it is also distributed to the other front side frame 5 side, this also makes it difficult for the front side frame 5 to be bent.

And especially in this Embodiment, while the auxiliary | assistant frame 30 is divided | segmented into the front side member 31 and the rear side member 32, the front side member 31 is the wheel house inner panel 19 (panel which forms a wheel house). provided in the surface of the engine room 13 side, the rear member 32, since the front end portion is provided on a surface of the anti-engine 13 side of the panel 19 so as to overlap the rear end portion of the front member 31, the auxiliary The rear half of the frame 30 does not protrude toward the engine room 13 side of the wheel house 6. Therefore, even if the auxiliary frame 30 is provided, interference with equipment such as the master cylinder 60 of the brake device disposed behind the wheel house 6 is also avoided.

  The present invention can be widely applied to the structure around the wheel house in the front part of the automobile body.

1 is a front perspective view showing a front body structure of an automobile according to an embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. FIG. 4 is a perspective view in the direction of arrow C in FIG. 3 and obliquely from below. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG.

Explanation of symbols

1 Car 2 Dash panel (body parts)
3 Hinge Pillar 5 Front Side Frame 6 Wheel House 6a Suspension Tower 6a 'Top (Suspension Support)
12 Floor frame 16 Upper dash cross member (dash cross member)
17 Gusset (Dash Cross Member)
19 Wheelhouse inner panel (Panel forming the wheelhouse)
30 Auxiliary frame 31 Front member 32 Rear member 32a Front part 32b Rear part 32c Expansion part 41 1st connection panel (connection member)
X Closed section structure (closed section structure formed by dash panel and dash cross member)
Y closed cross-section structure (closed cross-section structure formed by connecting member and reinforcing frame)

Claims (3)

A front side frame that is in contact with the inner end side of the wheel house in the vehicle width direction and extends in the longitudinal direction of the vehicle body, the rear side is curved downward, and the rear end is connected to the floor frame, and the wheel house side of the front side frame A front body structure of an automobile provided with an auxiliary frame connected to a vehicle body member behind a wheel house, with a front end connected to a side portion, extending rearward and a rear end connected to a vehicle body member behind the wheel house,
The vehicle body member is a dash panel;
Hinge pillars are provided on the left and right of the dash panel,
A dash cross member extending in the vehicle width direction to connect the left and right hinge pillars is provided on the rear surface of the dash panel, the dash cross member and the rear surface of the dash panel form a closed cross-sectional structure, and
The auxiliary frame is divided into a front member and a rear member,
The front member is provided on the engine room side surface of the panel forming the wheel house, and the rear member is provided on the surface on the non-engine room side of the panel so that the front end portion overlaps the rear end portion of the front member. And
The rear portion of the rear member of the auxiliary frame is fastened with a bolt and a nut together with a flange portion of the rear end portion of the rear member, the dash panel, and a flange portion of the dash cross member. A front body structure of an automobile, wherein the front body structure is connected to the dash cross member via a panel. In the front body structure of an automobile according to claim 1,
The rear body member of the auxiliary frame has a rear body extending to a suspension support portion provided at an upper portion of the wheel house. In the front body structure of an automobile according to claim 2,
A connecting member that connects the dash panel and the suspension support portion in the vehicle longitudinal direction is provided.
A front body structure of an automobile, wherein the connecting member and the rear side of the rear member of the auxiliary frame form a closed cross-sectional structure extending from the dash panel to the suspension support portion.

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