JP6543296B2 - Front body structure - Google Patents

Description

  The present invention relates to a vehicle body front structure of a vehicle such as a car.

  For example, Patent Document 1 has a structure in which a load input from the front of a vehicle to a lower bulk member extending outward in the vehicle width direction from a front bulkhead is transmitted to a sub frame via a load path member (under load path). It is disclosed.

  In Patent Document 1, an excessive input load can be absorbed by dispersing the input load from the front of the vehicle into a larger number of paths.

Patent No. 5470340 gazette

  By the way, from the viewpoint of pedestrian protection, in order to reduce the input to the collided element as much as possible, it is easy to crush the lower bulk member to which the load is input as much as possible, and absorb the input load to the lower bulk member as much as possible. It will be necessary.

The present invention has been made in view of the above-mentioned point, and provides a vehicle body front structure capable of improving pedestrian protection by making the lower bulk member easy to be crushed when a load is input. The purpose is
Another object of the present invention is to provide a vehicle body front structure capable of preferably absorbing an excessive input load from the front of the vehicle.
Furthermore, another object of the present invention is to provide a vehicle body front structure capable of reconciling both the absorption of an excessive input load from the front of the vehicle and the improvement of pedestrian protection.

In order to achieve the above object, according to the present invention, a pair of left and right front side frames extending along the longitudinal direction of the vehicle and a lateral side of each front side frame are disposed along the lateral direction of the vehicle, A pair of left and right upper members extending, and a front bulkhead attached respectively to the pair of left and right front side frames and extending along the vehicle width direction, a pair of left and right connecting members provided between the respective upper members and the front bulkhead And the front bulkhead includes a lower bulk member disposed below, and the lower bulk member is a fragile portion positioned in front of the connecting member in the vehicle longitudinal direction and extending in the vehicle width direction. have a, the fragile portion is made of a bead, in the extending direction of the bead, have holes are formed It is characterized in.
Furthermore, according to the present invention, a pair of left and right front side frames extending along the longitudinal direction of the vehicle, and a pair of upper members disposed respectively on the outer side in the vehicle width direction of each front side frame and extending along the longitudinal direction A front bulkhead attached to the pair of left and right front side frames and extending along the vehicle width direction; and a pair of left and right connecting members provided between the upper members and the front bulkhead, The bulkhead includes a lower bulk member disposed below the lower bulk member, the lower bulk member having a weak portion extending in the vehicle width direction and located forward of the connecting member in the vehicle longitudinal direction, the lower bulk The member has an inner structure disposed on the inner side in the vehicle width direction and an outer structure on the outer side of the inner structure. A clearance is provided between a front end portion of the inner structural portion on the outer side in the vehicle width direction and a front end portion of the outer structural portions on the inner side in the vehicle width direction. It is characterized by

  In the present invention, by absorbing the input load to the lower bulk member, it is possible to obtain a vehicle body front structure capable of further improving pedestrian protection. Further, according to the present invention, it is possible to obtain a vehicle body front structure capable of preferably absorbing an excessive input load from the front of the vehicle. Furthermore, according to the present invention, it is possible to obtain a vehicle body front structure capable of reconciling both the absorption of an excessive input load from the front of the vehicle and the improvement of pedestrian protection.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic structure front view of the vehicle body front to which the vehicle front structure which concerns on embodiment of this invention was applied. It is a perspective view of the vehicle body front left side shown in FIG. It is a top view of the vehicle body front left side shown in FIG. It is a bottom view of the vehicle body front left side shown in FIG. It is a top view of an outer side member. (A) is a top view of a connection member, (b) is a bottom view of a connection member. (A) is a top view of the front side member which comprises a connection member, (b) is a top view of a rear side member. FIG. 6 is an exploded side view showing a state in which a front side member and a rear side member constituting a connecting member are connected along the vehicle longitudinal direction. It is a perspective view which shows the open cross section of an upper bulk member.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In each of the drawings, "front and rear" indicates the vehicle longitudinal direction, "left and right" indicates the vehicle width direction (left and right direction), and "upper and lower" indicate the vertical direction.

  As shown in FIG. 1, a vehicle to which a vehicle body front structure according to an embodiment of the present invention is applied has a vehicle body made of a monocoque body. The vehicle body is disposed symmetrically with respect to a central line (not shown) extending along the longitudinal direction of the vehicle through the center of the vehicle in the lateral direction of the vehicle.

  The vehicle body front portion 10 is configured to include a pair of left and right front side frames 12, 12, a pair of left and right upper members 14, 14, a pair of left and right connecting members 16, 16, and a front bulkhead 18.

  The pair of left and right front side frames 12, 12 are respectively disposed on the left and right sides along the vehicle width direction, and extend along the vehicle longitudinal direction. The vehicle rear end portions of the front side frames 12 are each branched into two and connected to a cross member (not shown).

  The pair of left and right upper members 14, 14 are respectively disposed outside the pair of left and right front side frames 12, 12 in the vehicle width direction, and extend along the vehicle longitudinal direction. The vehicle rear end of each upper member 14 is connected to a pair of left and right front pillars (not shown).

  As shown in FIG. 2, each upper member 14 is composed of an upper member upper portion 14a and an upper member lower portion 14b. The upper member upper portion 14a extends downward from the front pillar (not shown) toward the front of the vehicle. The upper member lower portion 14b extends in a substantially arc shape in a downward slope from the upper member upper portion 14a toward the lower side of the vehicle.

  As shown in FIG. 1, the left connecting member 16 is disposed between the left upper member 14 and the left front side frame 12. The right connecting member 16 is disposed between the right upper member 14 and the right front side frame 12. Each connecting member 16 mutually connects the pair of left and right upper members 14 and the pair of left and right front side frames 12, 12 along the vehicle width direction.

  The front bulkhead 18 is disposed at the front end of the vehicle, and includes a substantially rectangular frame in a front view. The front bulkhead 18 includes a pair of left and right side stays 34 and 34, an upper bulk member 36, and a lower bulk member 38. The pair of left and right side stays 34, 34 are disposed substantially in parallel in the vertical vertical direction in the vicinity of the front end portions of the pair of left and right front side frames 12, 12, respectively.

  The upper bulk member 36 is bridged along the vehicle width direction between the upper ends of the pair of left and right side stays 34, 34. The upper bulk member 36 is formed of an open cross section 36a having a substantially U-shaped axial straight cross section (see FIG. 9). For example, a harness 40 electrically connected to a hood open / close sensor (not shown) for detecting the open / close state of the hood (not shown), a bracket 42 for attaching a hood lock (not shown), etc. It is done.

  The lower bulk members 38 are bridged in the vehicle width direction between lower end portions of the pair of left and right upper member lower portions 14b, 14b. The lower bulk member 38 is located substantially below the upper bulk member 36 in the vertical vertical direction.

  As shown in FIG. 1, the lower bulk member 38 includes an inner structural portion 38a disposed between a pair of left and right front side frames 12, 12 and a pair of upper members 14 outside the inner structural portion 38a in the vehicle width direction and the left and right. And a pair of outer structural portions 38b, 38b disposed between the two.

  As shown in FIGS. 2 and 3, the inner structural portion 38 a includes a long rail-shaped inner member 50 bridged between the pair of left and right front side frames 12, 12 and a tip of the front side frame 12. And a tip member 51 joined to the inner member 50 to form a closed cross section. The tip member 51 is disposed on the inner side in the vehicle width direction of the lower bulk member 38 and overlaps the inner member 50.

  The outer structural parts 38b, 38b have a pair of left and right outer members 52, 52, a pair of left and right cover members 53, 53, and a pair of left and right intermediate members 55, 55 (see FIGS. 3 and 4). The pair of left and right outer members 52, 52 are respectively disposed on both sides of the inner member 50 in the vehicle width direction. Each cover member 53 has a front wall forming a front surface in the longitudinal direction of the vehicle, a side wall forming an outer surface in the vehicle width direction, and a bottom wall forming a bottom surface. Each intermediate member 55 has a bottom wall forming a bottom surface. A clearance 54 is provided between the front end 50a on the outer side in the vehicle width direction of the inner structural portion 38a and the front end 52a on the inner side in the vehicle width direction of each outer structural portion 38b.

  In the lower bulk member 38, a fragile portion 44 extending in the vehicle width direction at a position forward of the vehicle front end surface of the connecting member 16 in the vehicle longitudinal direction is disposed. The fragile portion 44 is composed of a first bead portion 45a formed in the inner structural portion 38a and a second bead portion 45b formed in the outer structural portion 38b.

  The first bead portion 45a is formed of a bead 46a formed of a linear step extending along the vehicle width direction. The beads 46 a are respectively formed at the same position overlapped on the end in the vehicle width direction of the inner member 50 and the tip end member 51.

  The second bead portion 45b is constituted by a bead 46b formed in a straight line by a groove recessed downward in the vertical direction. The bead 46b is formed on the outer member 52 described later along the vehicle width direction (see FIG. 5). In the extending direction of the bead 46b, two hole portions 48a and 48b penetrating on both the front and back sides are formed.

  As shown in FIG. 5, of the two holes 48a and 48b, one hole 48a on the outer side in the vehicle width direction is substantially orthogonal to the axis of the bead 46b, and extends so as to divide the linear bead 46b. It exists. The other hole 48b on the inner side in the vehicle width direction is formed by a long hole. The elongated hole is continuous with the end of the bead 46b in the vehicle width direction, and is inclined so as to rise upward from the end of the bead 46b in the vehicle width direction.

  As shown in FIG. 3, the clearance 54 is formed of a recess that is recessed in a substantially V shape from the front of the vehicle to the rear of the vehicle in a plan view. The concave portion is formed such that an oblique side portion 56 formed in the front end portion 50a of the inner member 50 and an oblique side portion 58 formed in the front end portion 52a of the outer member 52 intersect on the vehicle rear side.

  In the bottom view shown in FIG. 4, the clearance 54 is formed by the inclined surface portion 60 of the cover member 53 and the oblique side portion 56 of the inner member 50. Further, in FIG. 4, the position of the starting point 64 where the inclined surface portion 60 of the cover member 53 is inclined from the bottom surface portion 62 is equal to the position of the bead 46 b formed on the outer member 52 in the vertical vertical direction. Thus, when a load is input to the outer member 52 and the cover member 53, the deformation of the bead 46b and the deformation from the starting point 64 of the inclined surface portion 60 of the cover member 53 can be simultaneously performed.

  The inner structural portion 38a and the outer structural portion 38b are fastened and fixed to the front side frame 12 via collars, bolts and side stays 34 (not shown), respectively. Further, the vehicle width outward end of each cover member 53 is joined to the outer flange of the upper member 14, and the vehicle width inward end is joined to the vehicle width direction end of the inner member 50. . The vehicle width outward end of each intermediate member 55 is joined to the inner flange of the upper member 14 (see FIG. 2), and the vehicle width inward end is joined to the vehicle width direction end of the inner member 50 It is done. Furthermore, the outer member 52 and the cover member 53 are joined together so as to form a closed cross section in the vertical vertical direction.

  As shown in FIG. 6 (a), FIG. 6 (b), FIG. 7 (a), FIG. 7 (b) and FIG. 8, each connecting member 16 has a front member 16a located in front of the vehicle and And a rear side member 16b located on the rear side. The front side member 16a and the rear side member 16b are integrally joined (joined) by, for example, welding means (not shown). The strength of the front side member 16a is higher than the strength of the rear side member 16b. The points of strength will be described in detail later.

  The upper and lower surfaces of the front side member 16a and the rear side member 16b of each connecting member 16 are fixed in the longitudinal direction of the vehicle. That is, the upper flange portions 24 of the front side member 16a and the upper flange portions 30 of the rear side member 16b, and the lower flange portions 26 of the front side member 16a and the lower flange portions 32 of the rear side member 16b are connected from the vehicle longitudinal direction. In this state, they are integrally joined by, for example, welding means (not shown) (see FIG. 8). 6 (a) and 6 (b), the "x" mark shows the junction part of the front side member 16a and the rear side member 16b.

  The front member 16a has a hat-shaped cross section perpendicular to the longitudinal direction (see FIG. 8). Further, as shown in FIG. 7, the front side member 16 a includes a front face 20, an upper face 21, side flanges 22 a and 22 b, an upper flange 24, and a lower flange 26 (see FIG. 8) It is comprised from the lower surface part 29 (refer FIG. 8).

  The front surface portion 20 is formed in a substantially rectangular shape in a front view from the front side of the vehicle, and extends along the vehicle width direction in a substantially vertical plane. One side flange portion 22a is located on the outer side in the vehicle width direction of the front face portion 20 and is connected (joined) to the upper member 14 (upper member lower portion 14b) at three points (see FIG. 2). The other side flange portion 22b is located on the inner side in the vehicle width direction of the front face portion 20 and is connected (joined) to the front side frame 12 at three points (see FIG. 2). The upper surface portion 21 and the lower surface portion 29 are opposed in the substantially vertical vertical direction.

  As shown in FIG. 8, the upper flange portion 24 is formed on the rear side of the vehicle of the upper surface portion 21 so as to be bent with an upward slope to the right. The lower flange portion 26 is formed by bending the left lower slope toward the rear of the vehicle of the lower surface portion 29. The upper surface portion 21 is provided with a plurality of slits 27 extending in the longitudinal direction of the vehicle.

  As FIG.7 (b) and FIG. 8 show, the rear side member 16b is formed in the upper part of the substantially rectangular shaped front part 28 which opposes the front part 20 of the front side member 16a, and the front part 28, An upper flange portion 30 joined at three points with the upper flange portion 24 of 16a, and a lower flange joined at three points (see FIGS. 6A and 6B) with the lower flange portion 26 of the front side member 16a. And a unit 32. As shown in FIG. 8, the upper surface portion 21 of the front side member 16 a extends longer than the lower surface portion 29 toward the rear of the vehicle. Thus, the front surface portion 28 of the rear member 16b facing the rear of the vehicle is connected to the front surface portion 20 facing the front of the vehicle of the front side member 16a in a state of being inclined upward to the right.

  The vehicle to which the vehicle body front structure according to the present embodiment is applied is basically configured as described above, and the operation and effect thereof will be described next.

  In the present embodiment, lower bulk member 38 has fragile portion 44, which is located forward of the vehicle front end face of connecting member 16 in the vehicle longitudinal direction and extends in the vehicle width direction. . In the present embodiment, by providing the fragile portion 44 at the vehicle front position of the connecting member 16, the fragile portion 44 can be easily bent and deformed by the input load on the lower bulk member 38, and pedestrian protection can be improved.

  Further, in the present embodiment, the connection member 16 disposed between the upper member 14 and the front bulkhead 18 can preferably absorb an excessive load (for example, a frontal collision load). As a result, in the present embodiment, even when the fragile portion 44 is provided for the lower bulk member 38, it is possible to achieve both the absorption of the excessive load and the pedestrian protection.

  Furthermore, in the present embodiment, by providing the fragile portion 44 in the vehicle width direction, it becomes possible to displace the lower bulk member 38 toward the rear of the vehicle in the event of a frontal collision, and secure a sufficient collision stroke. Can.

  Furthermore, in the present embodiment, the fragile portion 44 is a bead 46a. By forming the lower bulk member 46b, it is possible to suppress the decrease in the rigidity and the strength of the lower bulk member 38. Further, in the present embodiment, by providing the holes 48a and 48b in the extending direction of the bead 46b, the lower bulk member 38 is more easily crushed when a load is input, and pedestrian protection is further improved. Can.

  Furthermore, in the present embodiment, by providing the clearance 54 between the inner member 50 and the outer member 52 of the lower bulk member 38, the lower bulk member 38 is easily crushed starting from the clearance 54 when a load is input. Thus, pedestrian protection can be further improved. The weight reduction can be achieved by the clearance 54.

  Furthermore, in the present embodiment, by forming the front side member 16 a of the connection member 16 in a hat shape in cross section, the formability of the front side member 16 a can be improved. Further, by making the strength of the front side member 16a higher than the strength of the rear side member 16b, an excessive load can be reliably received by the front side member 16a.

  Furthermore, in the present embodiment, the upper flanges 24 and 30 and the lower flanges 26 and 32 of the front side member 16a and the rear side member 16b are fixed in the vehicle longitudinal direction (see FIG. 8). And the collision load transmitted to the connecting member 16 can be efficiently absorbed.

DESCRIPTION OF SYMBOLS 10 Vehicle body front 12 Front side frame 14 Upper member 16 Connecting member 16a Front side member 16b Rear side member 18 Front bulkhead 38 Lower bulk member 38a Inner structural portion 38b Outer structural portion 44 fragile portion 46a, 46b Bead 48a, 48b Hole portion 50 inner side Member 52 Outer member 54 Clearance

Claims (5)

A pair of left and right front side frames extending along the longitudinal direction of the vehicle;
A pair of left and right upper members disposed respectively on the outer side in the vehicle width direction of the front side frames and extending along the longitudinal direction of the vehicle;
A front bulkhead attached to the pair of left and right front side frames and extending along the vehicle width direction;
A pair of left and right connecting members provided between the upper members and the front bulkhead;
Equipped with
The front bulkhead includes a lower bulk member disposed below,
The lower bulk member, have a fragile portion that extends in the vehicle width direction is positioned in front of the vehicle than the connection member in the vehicle longitudinal direction,
The fragile portion comprises a bead,
The extending direction of the bead, the vehicle front structure characterized that you have holes are formed. In the vehicle front structure of claim 1 Symbol placement,
The lower bulk member has an inner structural portion disposed inward in the vehicle width direction, and a pair of left and right outer structural portions disposed outward in the vehicle width direction of the inner structural portion.
A vehicle front structure characterized in that a clearance is provided between a front end portion of the inner structural portion on the outer side in the vehicle width direction and a front end portion of the outer structural portions on the inner side in the vehicle width direction. In the vehicle front structure according to claim 1 or 2 ,
The connecting member has a front member located forward of the vehicle and a rear member located rearward of the vehicle.
The front member is formed in a hat cross section,
Vehicle front structure characterized in that the strength of the front side member is higher than the strength of the rear side member. In the vehicle front structure according to claim 3 ,
In the vehicle front structure, the upper and lower surfaces of the front member and the rear member of the connecting member are fixed in the longitudinal direction of the vehicle. A pair of left and right front side frames extending along the longitudinal direction of the vehicle;
A pair of left and right upper members disposed respectively on the outer side in the vehicle width direction of the front side frames and extending along the longitudinal direction of the vehicle;
A front bulkhead attached to the pair of left and right front side frames and extending along the vehicle width direction;
A pair of left and right connecting members provided between the upper members and the front bulkhead;
Equipped with
The front bulkhead includes a lower bulk member disposed below,
The lower bulk member has a fragile portion extending forward in the vehicle width direction and located forward of the connecting member in the vehicle longitudinal direction.
The lower bulk member has an inner structural portion disposed inward in the vehicle width direction, and a pair of left and right outer structural portions disposed outward in the vehicle width direction of the inner structural portion.
A vehicle front structure characterized in that a clearance is provided between a front end portion of the inner structural portion on the outer side in the vehicle width direction and a front end portion of the outer structural portions on the inner side in the vehicle width direction.

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