JP6624186B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure.

  A vehicle such as an automobile has a vehicle body structure including a pair of side frames extending in the vehicle front-rear direction. The pair of side frames are members that are arranged apart from each other in the vehicle width direction, and have, for example, a rectangular closed cross section.

  Patent Literature 1 discloses a lower body structure of a vehicle. The vehicle body structure includes a pair of left and right front side frames extending in the vehicle front-rear direction, a pair of left and right rear side frames extending in the vehicle front-rear direction, a cross member, and a skew cross member. The front side frame and the rear side frame are connected via a pair of left and right side sills extending in the vehicle front-rear direction at both edges of the vehicle cabin floor.

  The cross member of the vehicle body structure connects the pair of left and right rear side frames to each other. The skew cross member extends in the vehicle width direction, and includes a rear end portion of at least one of a pair of left and right front side frames, and a connecting portion between the rear side frame and the cross member on the right and left opposite sides to the front side frame, Concatenate.

  Patent Literature 1 states that since the vehicle has a skew cross member in addition to the front side frame, the side sill, the rear side frame, and the cross member, the rigidity and strength of the vehicle body can be increased. In Patent Document 1, the input load received by the front side frame at the time of an offset collision is transmitted to the side sill immediately behind the front side frame, and can be transmitted to the other rear side frame by the oblique cross member.

JP 2008-230421 A

  In the vehicle body structure described in Patent Literature 1, the load transmitted from the front to the rear of one side frame at the time of an offset collision is transmitted to the other side frame by using a diagonal cross member to efficiently disperse the impact load. I do.

  However, the skew cross member of Patent Document 1 is merely connected to the side frame. In other words, the vehicle body structure disclosed in Patent Document 1 enhances rigidity by reinforcing the connection portion itself with the side frame, or increases rigidity in consideration of the peripheral structure of the connection portion, and thereby more fully deforms the side frame. There was room for improvement in the prevention.

  In view of such problems, an object of the present invention is to provide a vehicle body structure capable of more fully preventing deformation of a side frame due to an impact at the time of an offset collision.

  In order to solve the above-described problem, a typical configuration of the vehicle body structure according to the present invention is a vehicle body structure including a pair of side frames that are members extending in the vehicle front-rear direction and are spaced apart in the vehicle width direction. The body structure is further attached to the right side frame of the pair of side frames, and the right front side arm diagonally left rearward from the side frame, and the left front side attached to the left side frame diagonally right rearward from the side frame. An arm portion, a right rear arm portion attached to the right side frame and diagonally left forward from the side frame, and a left rear arm portion attached to the left side frame and diagonally right forward from the side frame; A cross member including a connecting portion for connecting each arm portion between the side frames; and a cross member disposed outside each of the pair of side frames in the vehicle width direction. A pair of body mount brackets for connecting the pair of side frames and the vehicle body are provided, and the pair of body mount brackets form the right front arm and the left front arm of the cross member as a pair of side frames when viewed from the side. It is characterized in that it overlaps the mounting part to be mounted.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body structure which can prevent deformation | transformation of a side frame by the impact at the time of an offset collision more completely can be provided.

1 is a diagram schematically illustrating a vehicle body structure and a cabin arranged in the vehicle body structure according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a part of the vehicle body structure of FIG. 1. FIG. 3 is a diagram schematically showing a state in which a drive system component is mounted on the vehicle body structure in FIG. 2. FIG. 3 is a view on arrow A of the vehicle body structure in FIG. 2. FIG. 5 is a diagram illustrating a cross section taken along line FF of the vehicle body structure in FIG. 4. FIG. 5 is a diagram illustrating a joining process of the center portions in the vehicle width direction of the cross member of the vehicle body structure in FIG. 4. FIG. 7 is a diagram illustrating a modification of the joining step in FIG. 6. FIG. 7 is a view showing another modified example of the joining step in FIG. 6. It is a figure which shows the modification of the vehicle body structure of FIG.

  A typical configuration of a vehicle body structure according to an embodiment of the present invention is a vehicle body structure including a pair of side frames that are members extending in a vehicle front-rear direction and are spaced apart in a vehicle width direction. Further, a right front arm attached to the right side frame of the pair of side frames and diagonally left rearward from the side frame, and a left front arm attached to the left side frame and diagonally right rearward from the side frame. A right rear arm attached to the right side frame and directed diagonally left forward from the side frame; a left rear arm attached to the left side frame and directed diagonally right forward from the side frame; and a pair of side frames. A cross member including a connecting portion that connects each arm portion between the pair of side frames; and a pair of side members disposed outside each of the pair of side frames in the vehicle width direction. A pair of body mount brackets for connecting the frame and the vehicle body, wherein the pair of body mount brackets are mounting portions for mounting the right front arm and the left front arm of the cross member as viewed from the side to the pair of side frames. Is characterized by being overlapped.

  According to the above configuration, the cross member includes the four arms attached to the pair of side frames, that is, the right front arm, the left front arm, the right rear arm, and the left rear arm, and the connecting portion. And each of these arm portions is connected between the pair of side frames by a connecting portion. Here, it is assumed that the impact force is concentrated on the right side frame at the time of an offset collision in which the impact force is concentrated on either the left or right of the front of the vehicle. Part of the load transmitted from the front to the rear of the right side frame at the time of the offset collision is transmitted to the right front arm of the cross member via the mounting part for mounting the right front arm of the cross member to the right side frame. Is done. Further, the load is transmitted to the left rear side arm portion of the cross member via the connecting portion where each arm portion is connected, and the left side frame is mounted via the mounting portion for mounting the left rear side arm portion to the left side frame. Distributed to

  In this manner, in the above configuration, the load at the time of the offset collision is changed from the right side frame to the left side frame or the left side frame by using the cross member including the four arms attached to the pair of side frames. From the right side frame.

  Here, the body mount bracket is a highly rigid bracket that connects the side frame and the vehicle body. In the above configuration, when viewed from the side, the body mount bracket overlaps the mounting portion for mounting the right front arm portion and the left front arm portion of the cross member to the pair of side frames, so that the torsional rigidity of the vehicle body is reduced. Can be enhanced. Therefore, according to the above configuration, the cross member including the four arms attached to the pair of side frames not only disperses the load caused by the offset collision, but also connects the right front arm and the left front arm to the pair of side frames. By overlapping the mounting portion to be mounted on the frame with the body mount bracket when viewed from the side, torsional deformation of the vehicle body can also be suppressed. Thus, the deformation of the side frame due to the impact at the time of the offset collision can be more completely prevented.

  The above-mentioned vehicle body structure may further include another cross member that is attached to and mounted on the pair of side frames and overlaps the pair of body mount brackets when viewed from the side. For this reason, in the cross member, a mounting portion for mounting the right front arm portion and the left front arm portion to the pair of side frames is, in addition to the highly rigid body mount bracket, attached to the pair of side frames. Is also reinforced by the cross member. Therefore, according to the above configuration, the torsional rigidity of the vehicle body can be further increased, so that the torsional deformation of the vehicle body at the time of an offset collision can be further suppressed, and the deformation of the side frames can be more completely prevented.

  The pair of side frames have a divergent portion that extends outward in the vehicle width direction toward the rear of the vehicle, and an attachment portion for attaching the right front arm portion and the left front arm portion of the cross member to the pair of side frames. Is located on the vehicle front side with respect to the flared portion, and the mounting portion for mounting the right rear arm portion and the left rear arm portion on the pair of side frames of the cross member is located on the vehicle rear side with respect to the flared portion or the flared portion. Good to be.

  As described above, the mounting portion for mounting the right front arm portion and the left front arm portion on the pair of side frames of the cross member is located on the vehicle front side with respect to the flared portion, so that the load at the time of the offset collision is reduced from this mounting portion. It is transmitted to the right front arm and the left front arm and is dispersed. The load distributed between the right front arm and the left front arm of the cross member is further transmitted to the right rear arm and the left rear arm of the cross member via the connecting portion where each arm is connected. Distributed. The load distributed between the right rear arm portion and the left rear arm portion of the cross member is further expanded at the diverging portion or the diverging portion via a mounting portion for mounting the right rear arm portion and the left rear arm portion to a pair of side frames. And transmitted to the rear of the vehicle. Therefore, according to the above configuration, the load at the time of the offset collision is not excessively transmitted to the flared portion, and the deformation of the side frame can be suppressed.

  The vehicle body structure further includes a mount bracket that extends from the right rear arm portion or the left rear arm portion of the cross member to the right or left side frame adjacent to the right rear arm portion or the left rear arm portion. Good.

  Here, the mount bracket is a highly rigid bracket on which a drive system component (for example, a differential gear) is mounted. By using such a mount bracket to cross the right rear arm or the left rear arm of the cross member and the right or left side frame, deformation of the side frame due to an impact at the time of an offset collision can be suppressed. .

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in the examples are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the specification and the drawings, elements having substantially the same function and configuration will be denoted by the same reference numerals, without redundant description, and elements not directly related to the present invention will be omitted. I do.

  FIG. 1 is a view schematically showing a vehicle body structure 100 and a cabin 102 arranged in the vehicle body structure 100 according to the embodiment of the present invention. The figure shows a state where the vehicle body structure 100 and the cabin 102 are viewed from obliquely below. Hereinafter, arrows X and Y shown in the drawings indicate a vehicle front side and a vehicle right side, respectively.

  The vehicle body structure 100 includes a pair of side frames 104 and 106 spaced apart in the vehicle width direction, and a plurality of cross members 108a to 108i extending between the pair of side frames 104 and 106. The vehicle body structure 100 forms a frame-like frame structure as illustrated by these members. Further, the vehicle body structure 100 can be applied to a vehicle in which the cabin 102 is disposed above the frame structure as shown in the figure.

  FIG. 2 is a diagram showing a part of the vehicle body structure 100 of FIG. The figure shows a state where the vehicle body structure 100 is viewed from above. FIG. 3 is a diagram schematically showing a state in which drive system components are mounted on the vehicle body structure 100 of FIG.

  As shown in FIG. 2, among the cross members 108a to 108i, a fourth and fifth cross member 108d and a cross member 108e are located from the front side of the vehicle. The cross member 108d is attached across the pair of side frames 104 and 106. The cross member 108d is bent so that both end portions 109a and 109b in the vehicle width direction are located on the front side of the vehicle with respect to the center portion 111 in the vehicle width direction, and both end portions 109a and 109b in the vehicle width direction are connected via brackets 110a and 110b. They are joined to the side frames 104 and 106, respectively. For this reason, the mounting positions of the cross members 108d of the pair of side frames 104 and 106 correspond to the positions of the brackets 110a and 110b.

  The cross member 108e is attached to the pair of side frames 104 and 106 on the rear side of the vehicle with respect to the cross member 108d. The cross member 108e is bent such that both end portions 113a and 113b in the vehicle width direction are located rearward of the vehicle with respect to the central portion 115 in the vehicle width direction. The cross member 108e has both ends 113a and 113b in the vehicle width direction joined to the side frames 104 and 106 via brackets 112a and 112b, respectively. For this reason, the mounting positions of the cross members 108e of the pair of side frames 104 and 106 correspond to the positions of the brackets 112a and 112b.

As shown in FIG. 2, the cross members 108d and 108e are joined at their center portions 111 and 115 in the vehicle width direction by a mount bracket 114, and are formed in an X shape in plan view. Specifically, the cross members 108d and 108e include four arms attached to the pair of side frames 104 and 106, namely, a right front arm 117a, a left front arm 117b, a right rear arm 119a, and a left rear side. The arm 119b is included. Further, these arms are connected by a connecting portion between the pair of side frames 104 and 106. Note that the connection portion is an area at the position of the mount bracket 114 in FIG. More specifically, as shown in FIG. 6, the connecting portion is a welded portion 186a, 186b, 190a, 190b for connecting the cross members 108d, 108e via the patches 184, 188 and the mount bracket 114. , 192a, 192b, 193a, and 193b.

  The right front side arm portion 117a is attached to the right side frame 104 of the pair of side frames 104 and 106, and extends obliquely left rearward from the side frame 104. The left front arm portion 117b is attached to the left side frame 106 and extends obliquely rightward and rearward from the side frame 106. The right rear arm portion 119a is attached to the right side frame 104 and extends obliquely leftward and forward from the side frame 104. The left rear arm portion 119b is attached to the left side frame 106 and extends obliquely rightward and forward from the side frame 106.

  In the brackets 110a and 110b, the right front arm 117a and the left front arm 117b of the cross members 108d and 108e are attached to the pair of side frames 104 and 106. The brackets 112a and 112b attach the right rear arm 119a and the left rear arm 119b of the cross members 108d and 108e to the pair of side frames 104 and 106, respectively.

  The mount bracket 114 is a highly rigid bracket on which a drive system component (for example, the transmission 116 shown in FIG. 3) is mounted. Such a mount bracket 114 is disposed at a joint between a pair of side frames 104 and 106 to which the respective arms of the cross members 108d and 108e are joined. Therefore, by using the mount bracket 114, the center portions 111 and 115 of the cross members 108d and 108e in the vehicle width direction can be joined to each other with high rigidity as a result of the arms 117a, 117b, 119a and 119b.

  As shown in FIG. 2, the brackets 110a and 110b include sides 118a and 118b along the right front arm 117a or the left front arm 117b, sides 120a and 120b along the side frames 104 and 106, and a right front arm. At least one side 122a, 122b crossing the portion 117a or the left front arm portion 117b. Further, the brackets 110a and 110b include sides 124a and 124b bent from the sides 122a and 122b toward the side frames 104 and 106, respectively.

  In this embodiment, the brackets 110a and 110b have a square shape as shown in FIG. 2, but are not limited to this. As an example, the brackets 110a and 110b may be trapezoidal, or may be triangular if the sides 122a and 122b do not bend and extend to the side frames 104 and 106 without the sides 124a and 124b. it can. By forming the brackets 110a and 110b in various polygonal shapes, the right front arm 117a and the left front arm 117b of the cross member 108d can be attached to the side frames 104 and 106 with high rigidity.

  The brackets 112a, 112b include one side 126a, 126b along the right rear arm portion 119a or the left rear arm portion 119b, one side 128a, 128b along the side frames 104, 106, and the right rear arm portion 119a or the left side. At least one side 130a, 130b crossing the rear arm portion 119b is included. Further, the brackets 112a, 112b include sides 132a, 132b bent from the sides 130a, 130b toward the side frames 104, 106.

  For this reason, the brackets 112a and 112b have a square shape as shown in FIG. 2, but are not limited to this. As an example, if the brackets 112a and 112b do not bend the sides 130a and 130b and extend to the side frames 104 and 106, the sides 132a and 132b do not exist and can form a triangular shape. As described above, by forming the brackets 112a and 112b in a trapezoidal shape or a polygonal shape such as a triangular shape, the right rear arm portion 119a and the left rear arm portion 119b of the cross member 108e are attached to the side frames 104 and 106 with high rigidity. Can be installed.

  Body mount brackets 134 and 136 are arranged outside the side frames 104 and 106 in the vehicle width direction, as shown in FIG. The pair of body mount brackets 134 and 136 are high rigidity brackets for connecting the pair of side frames 104 and 106 and the cabin 102. The cross member 108c is attached to the pair of side frames 104 and 106 so as to extend therefrom. The cross member 108c is joined to the side frames 104 and 106 via brackets 138a and 138b, respectively.

  As can be seen from FIG. 2, the range extending in the front-rear direction of the body mount brackets 134, 136 overlaps that of the brackets 110a, 110b corresponding to the positions of both end portions 109a, 109b in the vehicle width direction of the cross member 108d. The brackets 110a and 110b serve as attachment portions for attaching the right front arm portion 117a and the left front arm portion 117b of the cross members 108d and 108e to the pair of side frames 104 and 106. Further, the range extending in the front-rear direction of the body mount brackets 134, 136 also overlaps with that of the brackets 138a, 138b corresponding to the position of the cross member 108c. The brackets 138a and 138b are attachment portions for attaching the cross member 108c to the pair of side frames 104 and 106.

  Here, the side frames 104 and 106 extend in the vehicle front-rear direction, and have shapes symmetric to each other as shown in FIG. The flared portions 142 and 144 are formed on the side frames 104 and 106 so as to extend outward in the vehicle width direction toward the rear of the vehicle. For this reason, in the side frames 104 and 106, the input load at the time of a front collision tends to concentrate on the flared portions 142 and 144, and the flared portions 142 and 144 can be a starting point of deformation.

  Therefore, in the present embodiment, the positions of the brackets 110a, 110b, 112a, 112b are set so that the input load at the time of a front collision is not excessively transmitted to the flared portions 142, 144 of the side frames 104, 106. Specifically, the brackets 110a and 110b are set at positions on the vehicle front side of the divergent portions 142 and 144, and the brackets 112a and 112b are set at positions of the vehicle rear of the divergent portions 142 and 144. The brackets 112a and 112b are attachment portions for attaching the right rear arm portion 119a and the left rear arm portion 119b of the cross members 108d and 108e to the pair of side frames 104 and 106.

  Here, a case where the impact force concentrates on the side frame 104 of the vehicle body structure 100 at the time of a front collision, particularly at the time of an offset collision in which the impact force concentrates on one of the left and right sides of the front of the vehicle will be described.

  As shown in FIG. 2, the input load (see the arrow B) input to the right side frame 104 is transmitted from the front to the rear, and a part of the input load is transmitted via the bracket 110 a located on the vehicle front side of the flared portion 142. The force is transmitted to the right front arm 117a of the cross member 108d (see arrow C). The load transmitted from the right front arm portion 117a of the cross member 108d to the center portion 111 in the vehicle width direction is transmitted via the mount bracket 114 to the left rear arm portion 119b of the cross member 108e extending further obliquely rearward (arrow). D). Then, the load transmitted to the left rear arm portion 119b of the cross member 108e is distributed to the left side frame 106 via the bracket 112b located rearward of the vehicle with respect to the flared portion 144 of the side frame 106 (arrow). E). In this way, the load at the time of the offset collision is dispersed without being excessively transmitted to the flared portions 142 and 144.

  Mount brackets 146 and 148 are mounted inside the side frame 104 in the vehicle width direction. As shown in FIG. 2, the mount bracket 146 extends from the right rear arm portion 119a of the cross member 108e to the right side frame 104 adjacent to the right rear arm portion 119a.

  The mount bracket 146 is a highly rigid bracket on which a drive system component (for example, the differential gear 150 shown in FIG. 3) is mounted, and is fixed to the side frame 104 with high rigidity. As shown in FIG. 3, the differential gear 150 is mounted via a bracket 152 inserted between the mount brackets 146 and 148.

  FIG. 4 is a view on arrow A of the vehicle body structure 100 of FIG. However, in the drawings, the body mount brackets 134 and 136, the cross member 108c, and the brackets 138a and 138b are omitted. FIG. 5 is a view showing a cross section taken along line FF of the vehicle body structure 100 of FIG. FIG. 5B shows a modified example of the bracket 112a in FIG. 5A.

  As shown in FIG. 5A, the side frame 104 has an inner member 154 located on the vehicle interior and an outer member 156 located on the vehicle exterior, and these members are joined to form a rectangular closed member. A cross section 158 is formed.

  The brackets 110a, 110b have flanges 160a, 160b as shown in FIG. The flanges 160a, 160b project along the upper surfaces 162, 164 of the rectangular side frames 104, 106. The brackets 110a, 110b are securely fixed to the side frames 104, 106 by joining the flanges 160a, 160b to the upper surfaces 162, 164.

  The brackets 112a and 112b have flanges 166a and 166b as shown in FIG. The flanges 166a, 166b project along the upper surfaces 162, 164 of the side frames 104, 106. The brackets 112a and 112b are securely fixed to the side frames 104 and 106 by joining the flanges 166a and 166b to the upper surfaces 162 and 164.

  As shown in FIG. 5A, the bracket 112a has a surrounding portion 168 in addition to the flange 166a joined to the upper surface 162 of the side frame 104. The surrounding portion 168 extends from the flange 166a continuously along the side wall 170 of the inner member 154, and is curved so as to surround the cross member 108e. The lower end 172 of the surrounding portion 168 reaches the lower surface 174 of the side frame 104 and is joined to the lower surface 174.

  In this manner, the bracket 112a is joined not only to the upper surface 162 of the side frame 104 but also to the lower surface 174, so that the cross member 108e can be securely attached to the side frame 104. Similarly, the other brackets 110a, 110b, 112b may be joined to the lower surfaces 174, 176 (see FIG. 4) in addition to the upper surfaces 162, 164 of the side frames 104, 106.

  5B, the lower end 182 of the enclosing portion 180 does not reach the lower surface 174 of the side frame 104, and is joined to the side wall 170 of the inner member 154. Even such a bracket 178 is joined to the side wall 170 in addition to the upper surface 162 of the side frame 104, so that the cross member 108e can be securely attached to the side frame 104.

  FIG. 6 is a view showing a joining process of the vehicle width direction center portions 111 and 115 of the cross members 108d and 108e of the vehicle body structure 100 of FIG. The cross members 108d and 108e are formed by bending a highly rigid pipe member. First, as shown in FIG. 6A, the central portions 111 and 115 of the cross members 108d and 108e in the vehicle width direction are brought close to each other and joined via the patch 184. The patch 184 is welded above the cross member 108d at the welding point 186a, and is welded above the cross member 108e at the welding point 186b.

  As shown in FIG. 6C, a patch 188 is arranged below the cross members 108d and 108e. The patch 188 is welded to the lower side of the cross member 108d at the welding point 190a and to the lower side of the cross member 108e at the welding point 190b. FIG. 6C is a sectional view taken along line GG of FIG. 6B.

  Further, a mount bracket 114 is disposed above the cross members 108d and 108e. As shown in FIG. 6B, the mount bracket 114 is welded above the cross member 108d at welding points 192a and 192b, and is welded above the cross member 108e at welding points 193a and 193b. In this manner, the cross members 108d and 108e are formed in an X-shape with the vehicle width direction central portions 111 and 115 firmly joined to each other via the patches 184 and 188 and the mount bracket 114. That is, as shown in FIG. 2 or FIG. 4, the cross members 108d and 108e include the right front arm 117a, the left front arm 117b, the right rear arm 119a and the left rear arm 119b, and the respective welding locations. Each arm portion is connected between the pair of side frames 104 and 106 by the connecting portion.

  The vehicle body structure 100 according to the present embodiment has cross members 108d and 108e including four arms attached to a pair of side frames 104 and 106, and brackets 110a, 110b, 112a and 112b. In the vehicle body structure 100, by using these, the load at the time of the offset collision can be distributed from the right side frame 104 to the left side frame 106, or from the left side frame 106 to the right side frame 104. Further, in the vehicle body structure 100, since the brackets 110a, 110b, 112a, and 112b have a polygonal shape such as a triangular shape or a trapezoidal shape, the arms of the cross members 108d and 108e are attached to the side frames 104 and 106 with high rigidity, respectively. Can be installed.

  Also, in the vehicle body structure 100, the high-rigidity mounting bracket 114 on which the transmission 116 is mounted enables the center portions 111 and 115 of the cross members 108d and 108e in the vehicle width direction to be joined to each other with high rigidity. Therefore, according to the vehicle body structure 100, the deformation of the side frames 104 and 106 due to the impact at the time of the offset collision can be more completely prevented.

  In the vehicle body structure 100, as shown in FIG. 4, flanges 160a, 160b, 166a, and 166b are provided on brackets 110a, 110b, 112a, and 112b for attaching the cross members 108d and 108e to the side frames 104 and 106, respectively. Therefore, in the vehicle body structure 100, the flanges 160a, 160b, 166a, 166b of the brackets 110a, 110b, 112a, 112b can be temporarily placed on the upper surfaces 162, 164 of the side frames 104, 106 at the time of production (at the time of assembly).

  Therefore, the vehicle body structure 100 is easy to manufacture because it can be mounted while adjusting the mounting positions of the brackets 110a, 110b, 112a, 112b with respect to the upper surfaces 162, 164 of the side frames 104, 106. When the brackets 110a, 110b, 112a, 112b are fixed to the upper surfaces 162, 164 of the side frames 104, 106, for example, CO2 welding may be used, or an insertion hole may be provided and a bolt may be inserted through the hole. It may be fastened with a nut.

  Here, the transmission 116 (see FIG. 3), which is a driving system component mounted on the mount bracket 114, requires a high precision in the mounting position because the power transmission efficiency is reduced if the axial direction is shifted. On the other hand, in the vehicle body structure 100, the brackets 110a, 110b, 112a, and 112b are temporarily placed on the upper surfaces 162 and 164 of the side frames 104 and 106, so that the drive system components can be accurately positioned. Further, in the vehicle body structure 100, the cross members 108d and 108e including the four arms can be attached to the side frames 104 and 106 while accurately positioning the drive system components.

  In the vehicle body structure 100, as shown in FIG. 2, the brackets 110a and 110b are located on the vehicle front side with respect to the flared portions 142 and 144, and the brackets 112a and 112b are located on the vehicle rear side with respect to the flared portions 142 and 144. . Therefore, in the vehicle body structure 100, the load at the time of the offset collision is not excessively transmitted to the flared portions 142 and 144, and the deformation of the side frames 104 and 106 can be suppressed. In addition, if the load at the time of the offset collision is not excessively transmitted to the flared portions 142 and 144, the brackets 112a and 112b are not limited to the rear side of the vehicle than the flared portions 142 and 144, and may be located at or near the flared portions 142 and 142. It may be arranged.

In the vehicle body structure 100, as shown in FIG. 6, the cross members 108d and 108e are formed by bending a highly rigid pipe member. In this manner, the cross member 108d includes the right front arm portion 117a and the left front arm portion 117b (see FIG. 2), and has a V-shape that is open forward in plan view. The cross member 108e includes a right rear arm portion 119a and a left rear arm portion 119b, and has a V-shape that opens rearward in plan view. Then, the cross members 108d and 108e are formed in an X-shape in plan view by connecting the central portions 111 and 115 of the cross members 108d and 108e in the vehicle width direction at the connecting portion between the pair of side frames 104 and 106. Is done. Therefore, in the vehicle body structure 100, the load from the front received at the time of the offset collision can be reliably transmitted and dispersed obliquely rearward through the cross members 108d and 108e.

  In the vehicle body structure 100, a highly rigid mount bracket 146 on which the differential gear 150 is mounted extends from the right rear arm portion 119a of the cross member 108e to the side frame 104 adjacent to the right rear arm portion 119a. However, the present invention is not limited thereto, and the mount bracket 146 may extend from the left rear arm portion 119b of the cross member 108e to the side frame 106 adjacent to the left rear arm portion 119b depending on the position where the differential gear 150 is mounted. . For this reason, in the vehicle body structure 100, the deformation of the side frames 104 and 106 due to the impact at the time of the offset collision can be suppressed.

  Further, as shown in FIG. 2, the vehicle body structure 100 according to the present embodiment has rigid body mount brackets 134 and 136. The body mount brackets 134 and 136 overlap with the brackets 110a and 110b as attachment parts for attaching the right front arm 117a and the left front arm 117b of the cross member 108d to the side frames 104 and 106 when viewed from the side. . Therefore, in the vehicle body structure 100, the torsional rigidity of the vehicle body can be increased. Therefore, according to the vehicle body structure 100, not only the load accompanying the offset collision can be dispersed by the cross members 108d and 108e, but also the torsional deformation of the vehicle body can be suppressed, so that the deformation of the side frames 104 and 106 can be more completely prevented. it can.

  Further, the body mount brackets 134, 136 also overlap brackets 138a, 138b as attachment portions for attaching the cross member 108c to the pair of side frames 104, 106, as viewed from the side. For this reason, according to the vehicle body structure 100, a mounting portion for mounting the right front arm portion 117a and the left front arm portion 117b of the cross member 108d to the side frames 104 and 106 has the rigidity of the body mount brackets 134 and 136 and the cross member 108c. Also reinforced. Therefore, according to the vehicle body structure 100, the torsional rigidity of the vehicle body can be further increased, the torsional deformation of the vehicle body at the time of an offset collision can be further suppressed, and the deformation of the side frames 104 and 106 can be more completely prevented. .

FIG. 7 is a view showing a modification of the joining step of FIG. In the bonding step of the modification, the cross member 108d as shown in FIG. 7 (a), contacting the vehicle width direction central portion 111 and 115 with each other 108e, further car welding point 194, as shown in FIG. 7 (b) The widthwise central portions 111 and 115 are welded to each other. FIG. 7B is a sectional view taken along line HH of FIG.

  In the joining process of the modified example of FIG. 7, the center portions 111 and 115 of the cross members 108d and 108e in the vehicle width direction can be easily joined without using the patches 184 and 188 and the mount bracket 114 shown in FIG.

  FIG. 8 is a view showing another modified example of the joining step of FIG. In the joining step of the modification shown in FIG. 8, first, cross members 108j, 108k, 108l formed of square pipes are prepared. Next, as shown in FIG. 8A, the cross members 108k and 108l are arranged so as to be linear with the cross member 108j interposed therebetween. FIG. 8B is a cross-sectional view taken along the line II of FIG.

  Subsequently, as shown in FIG. 8B, the end of the cross member 108k and the cross member 108j are welded at the welding point 195a, and the end of the cross member 108l and the cross member 108j are welded at the welding point 195b. Even by such a joining process, the X-shaped cross members 108j, 108k, 108l can be formed. That is, in order for the cross member to form an X-shape, the cross members do not necessarily have to be bent and then joined together (see FIG. 6), and as shown in FIG. 8, cross the linear cross members. It may be joined as follows.

  FIG. 9 is a diagram showing a modification of the vehicle body structure 100 of FIG. In the vehicle body structure 100A of the modified example, the vehicle width direction ends 196a, 196b, 197a, and 197b of the X-shaped cross members 108m and 108n shown in FIG. It is directly attached to the frames 104A and 106A.

  That is, the cross member 108m shown in FIG. 9B has the vehicle width direction ends 196a, 196b inserted into the through holes 198a, 198b formed in the side frames 104A, 106A, respectively, so that the side frames 104A, 106A. Mounted on. The cross member 108n is attached to the side frames 104A and 106A by inserting the vehicle width direction ends 197a and 197b into through holes 199a and 199b formed in the side frames 104A and 106A, respectively.

  In such a vehicle body structure 100A, the X-shaped cross members 108m and 108n can be directly attached to the side frames 104A and 106A. Also, the through holes 198a, 198b, 199a, 199b of the side frames 104A, 106A are located before and after the flared portions 142, 144 of the side frames 104A, 106A. Therefore, even with the vehicle body structure 100A, the load at the time of the offset collision is not excessively transmitted to the flared portions 142 and 144, and the deformation of the side frames 104A and 106A can be suppressed.

  Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive various changes or modifications within the scope of the claims, and these naturally belong to the technical scope of the present invention. I understand.

  INDUSTRIAL APPLICATION This invention can be utilized for a vehicle body structure.

100, 100A: body structure, 102: cabin, 104, 106, 104A, 106A: side frame, 108a to 108i, 108j to 108n: cross member, 109a, 109b, 113a, 113b: both ends in the vehicle width direction of the cross member, 110a, 110b, 112a, 112b, 138a, 138b, 152, 178 ... Bracket, 111, 115 ... Central part of cross member in the vehicle width direction, 114, 146, 148 ... Mount bracket, 116 ... Transmission, 117a, 117b, 119a, 119b... Arms of the cross member, 118a, 118b, 120a, 120b, 122a, 122b, 124a, 124b, 126a, 126b, 128a, 128b, 130a, 130b, 132a, 132b. 34, 136: body mount bracket, 142, 144: divergent portion, 150: differential gear, 154: inner member, 156: outer member, 158: closed section, 160a, 160b, 166a, 166b: bracket flange, 162, 164 .., 180, the surrounding portion, 170, the side wall of the inner member, 172, 182, the lower end of the surrounding portion, 174, 176, the lower surface of the side frame, 184, 188, the patches, 186a, 186b, 190a, 190b, 192a, 192b, 193a, 193b, 194, 195a, 195b ... welded parts, 196a, 196b, 197a, 197b ... end portions of the cross members in the vehicle width direction, 198a, 198b, 199a, 199b ... through holes in the side frames

Claims (2)

In a vehicle body structure including a pair of side frames, which are members extending in the vehicle front-rear direction and spaced apart in the vehicle width direction,
The body structure further
A right front arm attached to the right side frame of the pair of side frames and directed diagonally left rearward from the side frame, and a left front arm attached to the left side frame and directed obliquely right rear from the side frame. A right rear arm attached to the right side frame and directed diagonally left forward from the side frame; a left rear arm attached to the left side frame and directed diagonally right forward from the side frame; A cross member including a coupling portion that couples each arm portion between a pair of side frames,
A pair of body mount brackets disposed outside each of the pair of side frames in the vehicle width direction and connecting the pair of side frames and the vehicle body;
The pair of body mount brackets overlap a mounting portion for mounting the right front arm and the left front arm of the cross member to the pair of side frames when viewed from the side ,
The vehicle body structure further includes another cross member that is attached to and mounted on the pair of side frames and overlaps the pair of body mount brackets when viewed from the side,
In the pair of side frames, a divergent portion is formed that extends outward in the vehicle width direction as it goes rearward of the vehicle,
The mounting portion for mounting the right front arm and the left front arm of the cross member to the pair of side frames, the pair of body mount brackets, and the other cross member are located on the vehicle front side of the divergent portion. ,
Said attachment portion for attaching the right rear arm portion and the left rear arm portion to the pair of side frames of the cross member, characterized that you have located on the vehicle rear side of the flared portion or said distal expanded portion Body structure. The body structure further extends from the right rear arm or the left rear arm of the cross member to the right or left side frame adjacent to the right rear arm or the left rear arm. The vehicle body structure according to claim 1, further comprising a mounting bracket to be passed.

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