JP5150347B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front portion structure having left and right front side frames extending from a dashboard side forming a front wall of a passenger compartment to the front of a vehicle.

Some vehicle body front structures have dashboard cross members extending in the vehicle width direction on the interior side of the dashboard to which the front side frames arranged on the left and right sides of the engine room are attached (for example, Patent Documents) 1).
Japanese Utility Model Publication No. 63-972 (FIG. 1)

However, in the vehicle body front structure disclosed in Patent Document 1, when a collision load is applied to the front of the vehicle, the load is transmitted from the left and right front side frames to the dashboard cross member. It is conceivable that the strength of the intersecting portion where and are orthogonal is insufficient.
For example, there is a technology that also serves as a reinforcement by attaching a wheel house that covers the upper part of the tire at the intersection of the dashboard cross member and the front side frame, but naturally, it becomes a structure that covers the upper part of the intersection, When welding the intersection, there is a problem that the wheel house gets in the way and is difficult to manufacture.

  Also, when a load acts on the front of the vehicle, it is possible to absorb the impact by deforming the front side frame, but the deformation of the front side frame is irregular and unstable, and the amount of shock absorption There is a problem that the variation of the size becomes large.

  The present invention facilitates welding work between the dashboard cross member and the front side frame, improves the bonding strength between the dashboard cross member and the front side frame, reduces the weight, and provides a shock absorbing deformation mode for the front side frame. It is an object to provide a stabilized vehicle front structure.

The invention according to claim 1 is a dashboard cross member that is connected to a lower portion of a dashboard lower that forms a front wall of a passenger compartment, and a front side frame that extends from the dashboard cross member to the front of the vehicle and is disposed on the left and right sides of the engine room. And a damper housing attached to the front side frame, the damper housing is connected to the front wall portion facing forward of the vehicle, and the inside of the front side frame is directed to the inside of the oblique engine room. The front side frame is connected to the inner wall facing the engine room and the outer wall facing the inner wall by joining the bulkhead and the rear wall of the damper housing. The inside of the side frame is partitioned by joining the inner wall and the outer wall. Comprising a bulkhead are, the front side frame, a front deformable portion provided on the vehicle front of the bulkhead, and a central portion deformed portion is constituted by a rear deformable portion, the central portion deformed portion includes a front wall Inner fragility for inward bending provided on the inner wall facing the engine room, at the rear of the vehicle from the bulkhead of the front wall , the rear wall, and the bulkhead of the front wall and at the front of the vehicle from the bulkhead of the rear wall And the rear deformable portion is formed by a concave outer wall formed on the outer wall facing the inner wall at the rear of the damper housing , and an outer wall for the rear of the vehicle from the outer fragile. a supporting member which connects the outer portion of the dashboard cross member which extends in the vehicle outside than the outer wall portion, and wherein Tona Rukoto.

In the invention according to claim 1, the rear deformation portion connects the outer wall portion behind the vehicle from the outer weakness of the front side frame and the outer portion of the dashboard cross member extending outward from the outer wall portion. is provided with the to and support member, when the outer wall portion of the front side frame to the dashboard cross member of welding spot welding, which blocks the movement of the spot welding electrode to move from the upper to the outer wall And there is an advantage that the welding work between the dashboard cross member and the front side frame is easy.

In the invention according to claim 1, the rear deformation portion includes an outer wall portion at the rear of the vehicle from the outer weakness of the front side frame and an outer portion of the dashboard cross member that extends outward from the outer wall portion. is provided with the supporting member which connects the, the load applied to the joint side of the front side frame by a support member can be dispersed to the dashboard cross member, the bonding strength between the dashboard cross member and the front side frame Can be improved.

  Furthermore, the joining strength between the dashboard cross member and the front side frame can be improved by the support member, so that it is not necessary to use a larger wheel house than the support member, and the weight can be reduced.

In the first aspect of the invention, the damper housing faces the inside of the front side frame toward the inside of the diagonal engine room, and faces the inner side wall and the inner side wall of the front side frame facing the engine room. A bulkhead that is partitioned by joining to the outer wall portion, and a bulkhead that is connected to the rear wall portion of the damper housing and partitions the front side frame by joining the inner wall portion and the outer wall portion. The front side frame includes a front deformation portion, a central deformation portion, and a rear deformation portion provided in front of the vehicle from the bulkhead . The central deformation portion includes a front wall portion and a rear wall portion. and the wall portion, in the vehicle rear than bulkhead of the front wall, and, in the vehicle forward of the bulkhead of the rear wall portion, among which is provided on the inner wall portion facing to the engine room An inner fragile for the lower consists rear deformable portion includes an outer vulnerable for outturned formed concavely outer wall portion in the vehicle behind the damper housing, the outer wall of the vehicle behind the outer fragile and outer wall a supporting member which connects the outer portion of the dashboard cross member which is extended more in the outside of the vehicle, Tona Runode, when a load is applied to the front of the vehicle, the order front deformation portion front side frame deformed, then bending the inner fragile central deformable portion, it is possible to absorb the load bending outside vulnerable of the last rear deformable portion. At that time, the front deforming portion that continues to be deformed can be bent toward the outside of the vehicle, that is, away from the engine by the weakness of the rear deforming portion , and the absorption continues.
Therefore, there is an advantage that the shock absorption deformation mode of the front side frame can be stabilized.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a vehicle body front structure (first embodiment) according to the present invention.
The vehicle body front structure 11 supports a front suspension 15 to which a front wheel 14 is attached and an engine (not shown) at the front portion of the vehicle body 13 of the vehicle 12. Details will be described later.

The vehicle body 13 includes a side body 21 that forms the side wall of the compartment 17, an underbody 22 that forms the floor of the compartment 17, and a front body 23.
The front body 23 includes left and right front side frames 25 connected to the front floor frame 24 of the underbody 22, a damper housing 26 attached to the front side frame 25, a sub frame 27, and the vehicle body front structure 11. .

  The front body 23 includes a dashboard cross member 33 connected to the lower portion 32 of the dashboard lower 31 that forms the front wall of the passenger compartment 17, and the front of the vehicle 12 from the dashboard cross member 33 (in the direction of arrow a <b> 1). The front side frame 25 is extended to the left and right of the engine room 34.

  The sub-frame 27 is an existing configuration, and a rectangular shape is formed by the first frame 35 to the fourth frame 38, the engine and the front suspension 15 are mounted, and the sub-frame 27 is raised from below the front body 23 as indicated by an arrow a2, Fasteners 43 are attached to the front collar nut 41 and the rear collar nut 42 provided on the front side frame 25.

The damper housing 26 has a damper base portion 47 to which an upper mounting portion 46 provided on the front damper 45 of the front suspension 15 is attached, and is attached with bolts and nuts. The structure for fastening with bolts and nuts is an existing configuration.
The vehicle body front structure 11 is substantially symmetric with respect to the center C of the vehicle 12, and will be described mainly on the left side.

FIG. 2 is a perspective view of a damper housing and a front side frame included in the vehicle body front structure of the present invention. This will be described with reference to FIG.
FIG. 3 is a perspective view of a front side frame and a dashboard cross member included in the vehicle body front part structure of the present invention. This will be described with reference to FIG.

  Specifically, in the vehicle body front structure 11, a damper housing connection bracket 51 is attached to the left front side frame 25 by a plurality of spot welds 52, and a lower joint portion 53 of the damper housing 26 is attached to the damper housing connection bracket 51. A plurality of spot welds 52 are attached, a rear collar nut 42 is erected in the front side frame 25, and an upper portion of the damper housing 26 is attached to the wheel house upper member 55, which is attached to the bulkhead upper member 56. It has been.

In the front side frame 25, a lid member 61 is attached to the side frame main body 57 with a plurality of spot welds 52, an intermediate partition member 62 is disposed below the lid member 61, and a plurality of spot welds are attached to the side frame main body 57. 52 is attached.
The side frame body 57 is long and has a U-shaped cross section formed by an inner wall portion 64, an outer wall portion 65, and a bottom portion 66.

The damper housing connecting bracket 51 includes a front corner member 71 disposed on the front side of the vehicle 12 and a rear corner member 72 disposed at a predetermined distance from the front corner member 71 to the rear of the vehicle 12.
In the embodiment, the front corner member 71 and the rear corner member 72 are separated from each other. However, the front corner member 71 and the rear corner member 72 may be integrally formed.

  The damper housing 26 also has a damper housing front lower portion 74 fitted in the side frame main body 57 and attached by a plurality of spot welds 52, and a damper housing rear lower portion 75 fitted in the side frame main body 57. A plurality of spot welds 52 are attached.

The damper housing front lower portion 74 is a lower portion of the front corner member 71 of the damper housing connection bracket 51 and is also a wall-shaped bulkhead.
The damper housing rear lower part 75 is a lower part of the rear corner member 72 of the damper housing connecting bracket 51 and also has a bulkhead structure.
Both the bulkhead structure and the bulkhead are plates that form a wall with one end attached to the inner side wall portion 64 of the front side frame 25 and the other end attached to the outer side wall portion 65, and partition the front side frame 25. Yes.

The front corner member 71 is formed by bending a steel plate into a substantially Z-shaped cross section, and includes a bulkhead portion 76 formed with a width that fits between the inner wall portion 64 and the outer wall portion 65.
The rear corner member 72 is substantially the same as the front corner member 71, and includes a bulkhead portion 77 formed with a width that fits between the inner wall portion 64 and the outer wall portion 65.

  Specifically, the damper housing 26 is integrally formed by plastic processing, and an inner wall portion 81 is formed continuously with the damper base portion 47 for fastening the front damper 45, and the front wall portion 82 and the inner wall portion 81 are connected with the inner wall portion 81. A rear wall 83 is formed. The bulkhead portion 76 is continuous with the front wall portion 82.

  FIG. 4 is a plan view of the vehicle body front structure of the present invention. 1 to 3 will be used in combination. In FIG. 4, the damper housing 26 is partially omitted from the front side frame 25 side, and the damper housing connection bracket 51 (the front corner member 71 and the rear corner member 72) is shown.

In the front corner member 71, the bulkhead portion 76 described above is inserted between the inner wall portion 64 and the outer wall portion 65.
The bulkhead portion 76 partitions the front side frame 25 toward the inside of the oblique engine room 34 (direction of arrow a3) by an angle θ.

  Specifically, the front side frame 25 has, in order from the front, a front deformed portion 91, an inner weakness 92 for inner bending, and an outer weakness 93 for outer bending, and the front deforming portion 91 is the front side frame 25. Between the front end 94 of the damper housing connecting bracket 51 and the bulkhead portion 76, and the inner weakness 92 for inward bending is located behind the vehicle 12 from the front deformation portion 91 (in the direction of the arrow a <b> 4). ) Is attached to the inner side wall portion 64 of the front side frame 25 located inward of the damper housing 26, and the outer fragile 93 for outer bending is positioned behind the vehicle 12 from the inner fragile 92 for inner bending. The outer wall 65 of the front side frame 25 located between the rear wall 83 (rear corner member 72) of the damper housing 26 and the dashboard cross member 33. It is formed.

Further, the inner weakness 92 is formed in the central deformation portion 96 and the outer weakness 93 is formed in the rear deformation portion 97.
The front side frame 25 is further connected at its rear end 98 facing the front end 94 to the dashboard cross member 33 by a plurality of spot welds 52 (see FIG. 2). The center of the outer wall portion 65 of the front side frame 25 located between the members 33 and the outer portion 101 of the dashboard cross member 33 are connected by a gusset 102 which is a support member.
A front bumper (not shown) is attached to the front end 94.

  The front deformation portion 91 is a portion having the lowest strength against the compressive load in the front side frame 25, and is deformed into a bellows shape by the compressive load. The configuration for reducing the strength is arbitrary, for example, the plate thickness of the front deformation portion 91 may be made thinner than other portions, the other portions may be reinforced, and the strength (number) of spot welding is reduced. It is also possible to form a notch.

  The central deformation portion 96 has an internal weakness 92 for internal bending, and is reinforced by the damper housing 26 at a portion in the damper housing 26, and thus is a portion having higher strength than the front deformation portion 91. . In other words, the damper housing connection bracket 51 is reinforced at a portion in the damper housing connection bracket 51.

  The rear deformable portion 97 has an outer weakness 93 for bending outward, and is reinforced by the gusset 102 at a rear portion of the central deformable portion 96, so that it has a higher strength than the front deformable portion 91. is there.

The inner fragile 92 is a U-shaped groove having a desired depth and width depending on conditions.
The outer fragile 93 is a U-shaped groove having a desired depth and width depending on conditions.
In addition, although each weakness is formed in one place, it is also possible to form the outer weakness 93 further in parallel in the vicinity of two or more places, for example, the outer weakness 93.

  The dashboard cross member 33 is a long rectangular tube extending in the vehicle width direction (X-axis direction in FIG. 1), and a front portion 104 having a U-shaped cross section facing the front of the vehicle 12 (in the direction of the arrow a1). And a rear surface portion 105 having a U-shaped cross section that joins the edges of the front surface portion 104 so as to face the front surface portion 104, and both ends are connected to the front pillars 106 (see FIG. 1) of the side body 21, respectively. ing. Then, the rear end 98 of the front side frame 25 is connected to the side frame connecting portion 107 provided on the front surface portion 104, and the front surface portion 104 located outside the vehicle 12 (in the direction of arrow a <b> 5) from the side frame connecting portion 107. The outer wall portion 65 of the front side frame 25 is connected via the gusset 102.

The support member (gusset) 102 is plate-shaped, and is arranged with its surface facing the outside of the vehicle 12, so that it is a three-member dashboard dashboard member 33 and front side frame 25 in a plan view, and has a triangular opening 111. Is formed upward. Then, an angle α () is applied to the central holding portion 112 that is separated from the outer fragile 93 formed on the outer wall portion 65 of the front side frame 25 facing the outside of the vehicle 12 by a desired distance toward the dashboard cross member 33 side. One end is attached to the dashboard cross member 33 extending from the front side frame 25 to the outside of the vehicle 12 at about 45 °, and one end is attached to the outer portion 101.
Although one end is attached to the outer fragile 93 by a desired distance, it is also possible to attach one end in the vicinity of the outer fragile 93.

Next, the operation of the vehicle body front structure of the present invention will be described.
FIG. 5 is a view for explaining the assembly relationship among the support member, the front side frame, and the dashboard cross member provided in the vehicle body front part structure of the present invention.
The vehicle body front part structure 11 joins the front side frame 25 and the dashboard cross member 33 by spot welding. In this assembling welding operation, since the support member (gusset) 102 is previously joined by spot welding, the first electrode 116 for spot welding is attached to the welding overlap portion 114 formed at the rear end 98 of the front side frame 25. When hitting, the first electrode 116 is lowered (in the Z-axis direction) as indicated by arrow b1 from above the welding overlap portion 114, and is inserted into the opening 111 formed by the support member (gusset) 102, so that the welding overlap portion 114 can abut.

  Subsequently, the first electrode 116 is moved (Y-axis direction), and the second electrode 117 is applied to the dashboard cross member 33. And the welding overlap part 114 and the dashboard cross member 33 which are piled up can be pressed and welding can be performed.

  As described above, in the vehicle body front structure 11, the opening 111 can be formed above the welded portion between the rear end 98 of the front side frame 25 and the dashboard cross member 33 by the support member (gusset) 102. The welding operation between the board cross member 33 and the front side frame 25 is facilitated.

  Further, the support member (gusset) 102 can increase a reaction force against a load that bends the front side frame 25 outward of the vehicle 12 with the rear end 98 of the front side frame 25 as a starting point. Accordingly, the bonding strength between the dashboard cross member 33 and the front side frame 25 can be improved.

  By adopting the support member (gusset) 102, it is not necessary to use a wheel house larger than the support member (gusset) 102 for reinforcement, and the weight can be reduced.

FIG. 6 is a diagram for explaining a shock absorbing mechanism of the vehicle body front structure according to the present invention. Equipment and parts such as the front bumper are omitted.
In the vehicle body front structure 11, when a load, for example, a collision load is applied to the front surface of the vehicle 12 as indicated by an arrow b2, the front deformation portion 91 of the front side frame 25 is deformed toward the rear of the vehicle 12, Absorbs load.

FIG. 7 is a diagram for explaining the continuation of FIG.
When the front deformation portion 91 transmits the load to the damper housing 26 and the central deformation portion 96 while absorbing the load, the front side frame 25 bends inward of the vehicle 12 as indicated by an arrow b3 with the inner weakness 92 as a starting point. The load is absorbed.
Further, since the front wall portion 82 (front corner member 71) of the damper housing 26 is obliquely directed to the engine room 34, the front side frame 25 is easily bent inside the vehicle 12 as indicated by an arrow b3.

Specifically, the front wall portion 82 of the damper housing 26, that is, the front corner member 71 of the damper housing connecting bracket 51 is inclined inward (angle θ), and therefore falls inward compared to the one partitioned at right angles. It will be.
Furthermore, since the load concentrates on the inner fragile 92 for inner bending, the inner wall portion 64 buckles from the inner fragile 92.

FIG. 8 is a diagram for explaining the continuation of FIG.
When the center deforming portion 96 absorbs the load and transmits it to the rear deforming portion 97, the front side frame 25 is moved to the outside of the vehicle 12 by the support member (gusset) 102 and the outer fragile 93 provided in the rear deforming portion 97. Bend like b4. And a load can be absorbed further.

Specifically, when a load is applied, the rear deformation portion 97 concentrates on the central holding portion 112 of the outer side wall portion 65 of the front side frame 25 to which the support member (gusset) 102 is attached. A force is generated in the portion 97 to bend the front side frame 25 to the outside of the vehicle 12 as indicated by an arrow b4 with the central holding portion 112 and the central holding portion 112 as a starting point.
Further, since the load concentrates on the outer fragile 93 for outward bending, the front side frame 25 bends to the outside of the vehicle 12 as indicated by an arrow b4 with the outer fragile 93 as a starting point.
As a result, the front side frame 25 can be bent to the outside of the vehicle 12 as shown by an arrow b4, and there is an advantage that the front side frame 25 does not interfere with the engine 121 and does not hinder the deformation of the front deformation portion 91.

  Thus, in the vehicle body front structure 11, the damper housing 26 includes the bulkhead (lower portion of the damper housing) 74 that partitions the inside of the front side frame 25 toward the inside of the oblique engine room 34, and The frame 25 includes, in order from the front, a front deformed portion 91, an inner bending inner weakness 92 provided on the inner wall portion 64, an outer bending outer weakness 93 formed in a concave shape on the outer wall portion 65, and an outer A support member (gusset) 102 that connects an outer wall portion 65 at the rear of the vehicle from the fragile 93 and an outer portion 101 of the dashboard cross member 33 that extends outward from the outer wall portion 65 to the vehicle. Therefore, the front side frame 25 can be deformed by the front deformation portion 91, the inner weakness 92, and the outer weakness 93, respectively. The yield deformation mode can be stabilized.

  In addition, although the vehicle body front part structure of this invention was employ | adopted as the vehicle in embodiment, it can be employ | adopted also in the structure which attaches an apparatus to a elongate frame other than a vehicle.

  The vehicle body front part structure of the present invention is suitable for a vehicle.

1 is a perspective view of a vehicle body front structure (first embodiment) according to the present invention. It is a perspective view of the damper housing and front side frame with which the vehicle body front part structure of the present invention is provided. It is a perspective view of the front side frame and dashboard cross member with which the vehicle body front part structure of the present invention is provided. It is a top view of the vehicle body front part structure of this invention. It is a figure explaining the assembly | attachment relationship of the supporting member with which the vehicle body front part structure of this invention is provided, a front side frame, and a dashboard cross member. It is a figure explaining the mechanism of shock absorption of the body front part structure of the present invention. It is a figure explaining the continuation of FIG. It is a figure explaining the continuation of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Vehicle body front part structure, 12 ... Vehicle, 17 ... Cab, 25 ... Front side frame, 26 ... Damper housing, 31 ... Dashboard lower, 33 ... Dashboard cross member, 34 ... Engine room, 64 ... Inner side wall , 65 ... Outer wall part, 74 ... Bulk head (front lower part of damper housing), 82 ... Front wall part, 91 ... Front deformed part, 92 ... Inner fragile, 93 ... Outer fragile, 101 ... Outer part, 102 ... Support member (Gusset).

Claims (1)

A dashboard cross member connected to the lower part of the dashboard lower that forms the front wall of the passenger compartment, a front side frame that extends from the dashboard cross member to the front of the vehicle and is disposed on the left and right sides of the engine room, and the front side frame A vehicle body front structure comprising a damper housing attached thereto,
The damper housing is connected to the front wall portion facing forward of the vehicle, faces the inside of the front side frame toward the inside of the diagonal engine room, and the inner side wall portion facing the engine room of the front side frame and the A bulkhead that is partitioned by joining to an outer wall facing the inner wall, and a front side frame that joins the rear wall of the damper housing and joins the inner wall and the outer wall. And a bulkhead that is partitioned by
The front side frame is composed of a front deformation portion, a central deformation portion, and a rear deformation portion provided in front of the bulkhead .
The central portion deforming portion is located at the rear of the vehicle from the bulkhead of the front wall, the rear wall, and the front wall , and from the bulkhead of the rear wall to the front of the vehicle. an inner weak bending for inner provided on the inner wall portion facing to consist,
Said rear deformable portion, said an outer vulnerable for outturned formed in a concave shape from the damper housing to the outer wall portion that is opposed to the inner wall portion in the vehicle rear, the outer wall portion of the vehicle behind the outer vulnerable vehicle body front structure according to the support member, which connects the outer portion of the dashboard cross member which extends in the vehicle outside than the outer side wall portion, characterized in Tona Rukoto.

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