JP6650312B2 - Body front structure and vehicle - Google Patents

Description

  The present invention relates to a vehicle body front structure provided with a load transmitting member which is disposed on a front end side of a side frame in a vehicle width direction and extends obliquely forward toward a vehicle width direction outward, and an automobile vehicle provided with the same.

  2. Description of the Related Art In a vehicle body structure of an automobile vehicle, there is a demand for improved safety against offset collision in which the vehicle partially collides with an obstacle. In particular, in recent years, among offset collisions, there has been a demand for improved performance against so-called small overlap collision in which an obstacle collides only with an end portion in the vehicle width direction of the vehicle.

  As a vehicle body structure for improving the performance against a small overlap collision, a load transmission member is provided on the front end side of the side frame, the load transmission member being disposed outside in the vehicle width direction and extending obliquely forward toward the vehicle width direction outside. Is fixed to a side frame behind a central portion in the front-rear direction of a power unit (for example, see Patent Documents 1 and 2). According to these vehicle body front structures, the area near the fixed position of the load transmitting member on the side frame is displaced in the direction approaching the power unit by the load input from the front end of the load transmitting member to the rear. Thereby, at the time of a small overlap collision, the side frame can be bent and deformed, and the power unit can be pushed inward in the vehicle width direction. As a result, while absorbing the collision energy by bending the side frame, the heavy power unit can be pushed to the opposite side of the collision object to change the traveling direction of the vehicle to a direction avoiding the collision object.

JP 2013-203320 A JP 2012-214 211 A

  In the vehicle body front structures described in Patent Literatures 1 and 2, further improvement in energy absorption efficiency at the time of a small overlap collision is required.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body front structure capable of further improving the energy absorption efficiency at the time of a small overlap collision and an automobile vehicle including the same. To provide.

  To achieve the above object, according to the present invention, a pair of left and right side frames extending in the front-rear direction, and are disposed on the outer side in the vehicle width direction on the front end side of the side frames, and are slanted forward toward the outer side in the vehicle width direction. And a load transmitting member extending to the side, wherein the load transmitting member has a rear end side fixed to the side frame, a front end side arranged at an interval in the vehicle width direction with the side frame, and the load transmitting member has at least There is provided a vehicle body front structure having a frame load transmitting portion that extends rearwardly inclining outward in the vehicle width direction toward the rear with respect to the extending direction of the load transmitting member.

  According to the vehicle body front structure, since the frame load transmitting portion extends in the direction of extension of the side frame, when the load transmitting member is moved by a load input from the front end to the rear, the load transmitting portion for the frame is transmitted. The load can be accurately transmitted from the portion to the side frame. Thereby, at the time of a small overlap collision, the amount of energy absorption at the rear portion of the side frame can be improved.

  In the vehicle body front structure, when the load transmitting member is moved by a load input from a front end to a rear side, the load transmitting portion for a frame is connected to a ridge portion on a vehicle width direction outer side of the side frame. It is preferable to form a frame load transmission path that extends substantially in the front-rear direction together with the ridge portion.

  According to the vehicle body front structure, when the load transmitting member is moved by the load input from the front end to the rear, the frame load transmitting portion forms the frame load transmitting path together with the ridge portion of the side frame. The load applied to the transmission member can be efficiently transmitted to the rear portion of the side frame.

  In the vehicle body front structure, the frame load transmitting portion may include a ridge portion on the outer side in the vehicle width direction of the load transmitting member.

  According to this vehicle body front structure, when the load transmitting member is moved by the load input from the front end to the rear, the ridge of the load transmitting member and the ridge of the side frame are connected to form the frame load transmitting path. Form.

  In the above-described front body structure, the load transmitting member may have the same or larger size in the vehicle width direction on the rear end side than the side frame.

  According to this vehicle body front structure, the rear end side of the load transmitting member has the same or larger dimension in the vehicle width direction as the side frame, so that when the load transmitting member is moved by a load input from the front end to the rear side, the side frame Easy to transmit load to.

  In the vehicle body front structure, the load transmitting member has a closed cross section in a front view, and a rear end can be closed.

  According to this vehicle body front structure, the cross section on the rear end side of the load transmitting member is relatively maintained during a small overlap collision, and when the load transmitting member is moved by a load input from the front end to the rear, The connection between the load transmitting member forming the load transmitting path for the frame and the ridge of the side frame can be stably performed.

  The vehicle body front structure may further include a cross member that connects the side frames and extends in the left-right direction, and the cross member may be disposed behind a fixing portion of the load transmitting member in each of the side frames.

  According to the vehicle body front structure, when the load transmitting member is moved by the load input from the front end to the rear, the load can be transmitted from the load transmitting member to the cross member.

  In the vehicle body front structure, the side frame may include a reinforcing portion for reinforcing a front portion of a connecting portion of the cross member from a fixing portion of the load transmitting member.

  According to the vehicle body front structure, by reinforcing the rear from the vicinity of the fixed portion of the side frame, the load can be accurately transmitted to the cross member when the load transmitting member is moved by the load input from the front end to the rear. be able to.

  Further, according to the present invention, the vehicle body front structure, and a power unit disposed inward in the vehicle width direction of each of the side frames, the load transmission member is provided on the side frame, the front and rear direction of the power unit An automotive vehicle is provided that is secured behind a central portion.

  According to this automotive vehicle, in the event of a small overlap collision, the amount of energy absorption at the rear portion of the side frame can be improved, and the power unit of the heavy object is pushed inward in the vehicle width direction to change the traveling direction of the vehicle to the collision object. It can be changed in the direction to avoid.

  According to the present invention, the energy absorption efficiency at the time of a small overlap collision can be further improved.

1 is a schematic bottom view of a vehicle body front structure showing one embodiment of the present invention. (A) is sectional drawing of a gusset, (b) is a perspective view of a gusset. FIG. 4 is an explanatory diagram showing a behavior of a vehicle body front structure at the time of a small overlap collision. FIG. 4 is an explanatory diagram showing a behavior of a vehicle body front structure at the time of a small overlap collision. It is a modification of a gusset, and (a) is a sectional view of a gusset, and (b) is a perspective view of a gusset. It is a modification of a gusset, and (a) is a sectional view of a gusset, and (b) is a perspective view of a gusset.

  1 to 4 show one embodiment of the present invention. FIG. 1 is a schematic bottom view of a vehicle body front structure of the present invention, FIG. 2A is a sectional view of a gusset, and FIG. FIGS. 3 and 4 are perspective views of the gusset and FIGS. 3 and 4 are explanatory views showing the behavior of the vehicle body front structure at the time of a small overlap collision.

  As shown in FIG. 1, an automobile 1 has a vehicle body formed by assembling panel-shaped members formed by press-forming a steel plate, for example, and joining them by spot welding or the like. The vehicle body includes a pair of left and right side frames 10 extending in the front-rear direction on the front side of the vehicle, a radial core support 20 connecting the front ends of the side frames 10 and extending in the left and right direction, and being disposed in front of the radial core support 20 and extending in the left and right direction. A bumper beam 30, a cross member 40 connected to a lower portion of the front and rear predetermined position in each side frame 10 and extending in the left-right direction, and a pair of left and right gussets 50 disposed on the front end side of each side frame 10 on the vehicle width direction outside. Have. The suspension arm is attached to the cross member 40 via a bush, a bracket, or the like. The cross member 40 is disposed behind the fixed portion of the gusset 50 in each side frame 10. In addition, the vehicle 1 includes an engine 2 as a power unit disposed inside each side frame 10 in the vehicle width direction, and a transmission 3 connected to a rear portion of the engine 2.

  The gusset 50 as a load transmitting member extends diagonally forward toward the outside in the vehicle width direction. The gusset 50 has a rear end fixed to the side frame 10 and a front end spaced from the side frame 10 in the vehicle width direction. The front end of the gusset 50 is disposed at an interval in front of and behind the bumper beam 30 extending outward in the vehicle width direction in front of the side frame 10. The bumper beam 30 is supported at the front end of the side frame 10 via a stay. The front end side of the gusset 50 is supported by a support member 60 extending outward from the side frame 10 in the vehicle width direction. On the other hand, the rear end side of the gusset 50 is fixed to the side surface of the side frame 10 on the outer side in the vehicle width direction by a bolt. The gusset 50 has a frame load transmitting portion 51 that extends rearward with respect to the extending direction of the gusset 50 so as to incline outward in the vehicle width direction.

  As shown in FIG. 2, the gusset 50 has an inner panel 50 a on the inner side in the vehicle width direction and an outer panel 50 b on the outer side in the vehicle width direction, and the inner panel 50 a and the outer panel 50 b form a rectangular closed cross section in a front view. Is done. In the present embodiment, the inner panel 50a forms the upper surface, the left and right inner surfaces, and the lower surface of the gusset 50, and the outer panel 50b forms the left and right outer surfaces of the gusset 50. The inner panel 50a and the outer panel 50b are formed continuously with the upper surface and the lower surface of the gusset 50, and are joined by a flange extending outward in the vehicle width direction. In the present embodiment, although the flange portion is formed, the ridge portion 52 on the outer side in the vehicle width direction of the gusset 50 substantially forms the left and right outer surfaces of the gusset 50.

  The gusset 50 has a front panel 50c that closes the closed cross section at the front end, and a rear panel 50d that closes the closed cross section at the rear end. The front panel 50c has a front surface portion 50c1 that forms the front surface of the gusset 50, and a connection portion 50c2 that is connected to the support member 60 on the side frame 10 side. The rear panel 50d has a rear surface portion 50d1 that forms the rear surface of the gusset 50, and an extension portion 50d2 that extends rearward from the left and right inner sides of the rear surface portion 50d1 and overlaps the inner panel 51. An insertion hole 53 for inserting a bolt is formed in a portion of the gusset 50 where the extension portion 50d2 and the inner panel 51 overlap.

  The gusset 50 is formed so as to narrow in the vertical direction toward the rear and expand in the vehicle width direction, and has a rear end side vehicle width direction dimension larger than that of the side frame 10. The ridge portion 52 on the outer side in the vehicle width direction of the gusset 50 extends in the front direction in the extending direction of the gusset 50 and the rear end side inclines toward the rear in the extending direction of the gusset 50 toward the outside in the vehicle width direction. ing. In the present embodiment, the rear end side of the ridge line portion 52 forms the load transmitting portion 51 for the frame.

  On the other hand, the ridge 54 on the inner side in the vehicle width direction of the gusset 50 has a front side extending in the extending direction of the gusset 50 and a rear end side extending along the left and right outer surfaces of the side frame 10. The portion where the above-described extension portion 50d2 and the inner panel 51 overlap is located at the rear end of the ridge portion 54, and is fixed to the side frame 10 by bolts.

  The side frame 10 includes an inner panel on the inside in the vehicle width direction and an outer panel on the outside in the vehicle width direction, and has a rectangular closed cross section as viewed from the front. As shown in FIG. 1, the reinforcing panel 11 is provided on the left and right outer surfaces of the side frame 10 at the fixed portion of the gusset 50 so as to overlap the inside of the closed cross section. The reinforcing panel 11 as a reinforcing portion extends from the fixing portion of the gusset 50 in the side frame 10 to the front of the connecting portion of the cross member 40. Further, inside the reinforcing panel 11, a pedestal surface 12 a overlapped with the reinforcing panel 11, and a first partition portion 12 b extending inward in the vehicle width direction from a front end of the pedestal surface 12 a and substantially partitioning a closed cross section of the side frame 10. And a second partition portion 12c extending inward in the vehicle width direction from the rear end of the pedestal surface 12b and substantially partitioning a closed cross section of the side frame 10. Bolts (not shown) pass through the left and right outer surfaces of the side frame 10, the reinforcing panel 11, and the pedestal surface 12b of the separator 12.

The behavior of the automobile 1 configured as described above at the time of a small overlap collision will be described with reference to FIGS.
As shown in FIG. 3, in the event of a small overlap collision, a rearward load is input outside the side frame 10 in the vehicle width direction. First, the outer side of the bumper beam 30 in the vehicle width direction moves rearward, and then a load from the front end to the rear is input to the gusset 50. Then, the gusset 50 is moved rearward together with the bumper beam 30 while the rear end side is tilted inward in the vehicle width direction.

  When the gusset 50 is moved backward by a predetermined amount, the vicinity of the fixed portion of the gusset 50 in the side frame 10 is bent, and the side frame 10 pushes the engine 2 inward in the vehicle width direction. Here, since the separator 12 for partitioning the closed cross section is provided at the fixed portion of the gusset 50 in the side frame 10, the vicinity of the fixed portion is relatively strong, and the load from the side frame 10 to the engine 2 can be accurately applied. Can be transmitted.

  As shown in FIG. 4, when the gusset 50 is further moved rearward, the ridge portion 52 on the outer side in the vehicle width direction of the gusset 50 is connected to the ridge portion on the outer side in the vehicle width direction of the side frame 10. The frame load transmission path 90 is formed together with the ridge line portion. Thus, the load applied to the gusset 50 is efficiently transmitted to the rear portion of the side frame 10, and the rear portion of the side frame 10 can be deformed to absorb energy. At this time, since the rear surface of the gusset 50 is closed, the cross section on the rear end side of the gusset 50 is relatively maintained, and the connection between the gusset 50 and the ridge portion of the side frame 10 can be stably performed. it can. Further, since the size of the rear end side of the gusset 50 in the vehicle width direction is larger than the side frame 10, it is easy to transmit a load from the gusset 50 to the side frame 10.

  Further, since the cross member 40 is disposed behind the fixed portion of the gusset 50 in the side frame 10, a load can be transmitted from the gusset 50 to the cross member 40. In the present embodiment, since the front of the connecting portion of the cross member 40 from the fixing portion of the gusset 50 in the side frame 10 is reinforced by the reinforcing panel 11, the load can be transmitted to the cross member 40 accurately.

  As described above, according to the vehicle 1 of the present embodiment, the energy absorption efficiency at the time of a small overlap collision can be improved.

  In the above-described embodiment, the flange portion that joins the inner panel 50a and the outer panel 50b of the gusset 50 extends outward from the ridge 52 in the vehicle width direction. For example, as shown in FIG. The outer panel 150b and the outer panel 150b may be joined at the center of the gusset 150 in the vehicle width direction. In this case, the ridge 152 on the outer side in the vehicle width direction becomes the left and right outer surfaces of the gusset 150. Also in FIG. 5, the rear end side of the ridge portion 152 on the outer side in the vehicle width direction of the gusset 150 is inclined rearward in the vehicle width direction with respect to the extending direction of the gusset 150 to form the frame load transmitting portion 151. ing. The gusset 150 in FIG. 5 includes a rear panel 150d having a rear surface 150d1 forming the rear surface of the gusset 150, an extension 150d2 extending rearward from the left and right inside of the rear surface 501d1 and overlapping the inner panel 150a. And a reinforcing portion 150d3 extending rearward from the left and right inside of the rear surface portion 501d1 and overlapping the outer panel 150b.

  In the above-described embodiment, the rear end of the gusset 50 is closed. However, as shown in FIG. 6, the rear end of the gusset 250 may not be closed. In the above embodiment, the gusset 50 has a rectangular closed cross section. However, the shape of the closed cross section is not limited to this. For example, as shown in FIG. May have a closed section in which a concave portion 259 is formed.

  Further, in the above embodiment, only the rear end side of the ridge portion 52 on the outer side in the vehicle width direction of the gusset 50 is inclined rearward with respect to the extending direction toward the outer side in the vehicle width direction. As shown in FIG. 6, all of the ridge portions 252 of the gusset 250 may be inclined rearward with respect to the extending direction toward the outside in the vehicle width direction. That is, at least the rear end side of the load transmitting member may constitute the frame load transmitting section. The gusset 250 shown in FIG. 6 includes a gusset body that extends in the extending direction with the same closed cross section and includes an inner panel 250a and an outer panel 250b, and an expansion panel 250c that is formed outside the gusset body and extends rearward and outward in the vehicle width direction. And In the gusset 250, the ridge 252 on the outer side in the vehicle width direction of the extension panel 250b forms a load transfer portion 251 for the frame.

  Further, in the above-described embodiment, the ridge 52 of the gusset 50 forms the load transmitting portion 51 for the frame. However, for example, a strength member may be provided inside the gusset to use the gusset 50 as the load transmitting portion for the frame. it can. Further, although the vehicle width direction dimension of the rear end side of the gusset 50 is larger than the side frame 10, the same operation and effect can be obtained even if the size is the same as the side frame 10. Even if the size is small, the load transmission from the gusset 50 to the side frame 10 is possible as long as the frame load transmission portion is provided.

  Further, in the above-described embodiment, the vehicle 1 having the engine 2 as the power unit has been described, but it is needless to say that the power unit may be a motor or the like.

  The embodiments of the present invention have been described above, but the embodiments described above do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are necessarily indispensable for means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1 Automobile vehicle 2 Engine 10 Side frame 11 Reinforcement panel 40 Cross member 50 Gusset 51 Load transfer part for frame 52 Ridge part 150 Gusset 151 Load transfer part for frame 152 Ridge part 250 Gusset 251 Load transfer part for frame 252 Ridge part

Claims (8)

A pair of left and right side frames extending in the front-rear direction,
A load transmitting member that is disposed on the outer side in the vehicle width direction on the front end side of the side frame and that extends obliquely forward toward the outer side in the vehicle width direction;
The load transmitting member has a rear end side fixed to the side frame, and a front end side is arranged at an interval in the vehicle width direction with the side frame,
The load transmitting member extends at least to the rear end side inclining rearward in the vehicle width direction with respect to the extending direction of the load transmitting member, and is spaced apart from the side frame in the vehicle width direction. have a load transmitting portion frame which placed Ru,
When the load transmitting member is moved by a load input from the front end to the rear, the load transmitting portion for the frame is connected to the ridge portion on the vehicle width direction outside of the side frame and substantially in the front-rear direction together with the ridge portion. A vehicle body front structure that forms an extended frame load transmission path . 2. The vehicle body front structure according to claim 1 , wherein the frame load transmitting portion includes a ridge portion on the outer side in the vehicle width direction of the load transmitting member. 3. 3. The vehicle body front structure according to claim 2 , wherein the load transmitting member has a rear end side vehicle width direction dimension equal to or larger than the side frame. 4. The load transfer member has a closed cross section viewed from the front, the vehicle body front structure according to claim 2 or 3 the rear end is closed. The load transmitting member has a closed cross section including an upper surface, a vehicle width direction inner surface, a lower surface, and a vehicle width direction outer surface in a front view, and a front panel that closes the closed cross section at a front end, and the closed cross section. A rear panel that closes at the rear end,
The load transmitting member is configured such that a rear end side of the vehicle width direction inner surface is fixed to a vehicle width direction outer surface of the side frame, and a front end side of the vehicle width direction inner surface and the vehicle width direction outer surface. The vehicle body front structure according to claim 4, wherein a rear end side is arranged at a distance from the side frame in a vehicle width direction. A cross member that connects the side frames and extends in the left-right direction,
The vehicle body front structure according to any one of claims 2 to 5, wherein the cross member is disposed behind a fixing portion of the load transmitting member in each of the side frames.   The vehicle body front structure according to claim 6, wherein the side frame has a reinforcing portion for reinforcing a front of a connecting portion of the cross member from a fixing portion of the load transmitting member. A vehicle body front structure according to any one of claims 1 to 7,
A power unit arranged on the inner side in the vehicle width direction of each of the side frames,
The automobile vehicle, wherein the load transmission member is fixed to the side frame at a position rearward of a front-rear central portion of the power unit.

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