JP5141963B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure, and in particular, a vehicle body structure including a pair of side frames extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the vehicle body, and a sub frame provided below these side frames and supporting a suspension. About.

  Conventionally, there is a subframe structure as disclosed in Patent Document 1 that discloses a subframe structure in which the subframe contributes to the rigidity of the vehicle body.

  Conventionally, the front side frame and the bumper beam attached to the tip of the crash can and extending in the vehicle width direction have increased the rigidity of the front of the vehicle body. A vehicle that does not have one cross member is known (Patent Document 1).

  In such a vehicle, the suspension subframe is provided with a cross member extending in the vehicle width direction, and the entire suspension subframe having such a crossmember is located on the vehicle body side via a rubber mount. It was attached to.

JP 2006-051839 A JP 2007-203777 A

  However, in recent years, it has become necessary to increase the longitudinal length of the crash can in order to improve collision safety. Therefore, No. is attached to the front side frame on the vehicle body side. A reduction in the rigidity of the front of the vehicle body due to the absence of one cross member has been a problem.

  Here, no. When the 1 cross member is provided, the above-described cross member extending in the vehicle width direction of the subframe, Since one cross member is provided in parallel, problems such as an increase in weight and difficulty in layout occur.

  Therefore, the cross member extending in the vehicle width direction of the sub-frame is rigidly connected to the front side frame on the vehicle body side, so Although it is conceivable to improve the vehicle body rigidity by also serving as a cross member, in that case, since there is no rubber mount, vibration is greatly transmitted to the front side frame, and the NVH performance deteriorates. there were.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a vehicle body structure capable of achieving both improvement in vehicle body rigidity and vibration transmission interruption.

In order to achieve the above object, according to the vehicle body structure of the present invention, a pair of side frames extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the vehicle body, and a subframe provided below these side frames and supporting a suspension. A cross member extending in the vehicle width direction so as to connect the pair of side frames to each other by being rigidly connected to a portion to which the sub frame is attached in the vicinity of the ends of the pair of side frames, subframe, together with attached via a rubber mount at both ends of the cross member, attached via a rubber mount to the pair of side frames at a position spaced apart to the mounting position and the longitudinal direction of the vehicle body, the subframe of the side frame A bracket is provided at the lower part of the part to be attached. Via Tsu bets it is characterized in that attached to the side frame.

In the present invention configured as described above, the vehicle includes a pair of side frames that extend in the vehicle longitudinal direction on both sides in the vehicle width direction of the vehicle body, and a subframe that is provided below these side frames and supports the suspension, In the vicinity of the end portion of the side frame, the cross member is provided with a cross member that extends in the vehicle width direction so that the cross member is rigidly connected to a portion to which the sub frame is attached and connects the pair of side frames to each other. The body rigidity is improved by the frame. On the other hand, the sub-frame is attached to both ends of the cross member via rubber mounts, and is attached to the pair of side frames via rubber mounts at positions separated from the attachment position in the longitudinal direction of the vehicle body. The vibration transmitted to the subframe is attenuated by the rubber mount, and the NVH performance of the vehicle is improved. As a result, it is possible to achieve both improvement in vehicle body rigidity and interruption of vibration transmission.
In the present invention, a bracket is provided at a lower portion of the portion of the side frame to which the subframe is attached, and the cross member is attached to the side frame via the bracket. Can be avoided, and the arrangement position of the subframe can be optimized.

Further, in the present invention, preferably, the cross member has a closed cross section and includes an insertion portion through which the subframe can be inserted, and the rubber mount is provided in the closed cross section of the cross member and is inserted into the insertion portion. Is attached to the cross member via a rubber mount in a closed cross section.
In the present invention configured as described above, the layout efficiency can be improved by providing the rubber mount using the dead space in the cross member.

In the present invention, it is preferable that the subframe is inserted through the insertion portion and penetrates the cross member, and an energy absorbing member is provided at a tip portion of the subframe.
In the present invention configured as described above, it is possible to absorb energy at the time of collision while improving rigidity by rigid connection between the cross member and the side frame.

In the present invention, preferably, the rubber mount is configured to have an inner cylinder member, and the inner cylinder member is inserted between the upper and lower surfaces of the cross member and extends in the vertical direction. The cross member includes the inner cylinder member. It is attached to the side frame with bolts that penetrate vertically.
In the present invention configured as above, the support rigidity of the rubber mount can be improved. In addition, it is possible to improve the support rigidity of the shock absorbing member attached to the tip portion of the subframe.
In the present invention, an energy absorbing member is preferably provided at the tip of the subframe so as to protrude forward from the cross member.

In order to achieve the above object, in the vehicle body structure of the present invention, a pair of side frames extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the vehicle body, and a subframe provided below these side frames and supporting the suspension are provided. The sub-frame includes a front-rear direction member extending in the front-rear direction of the vehicle body and a cross member extending in the vehicle width direction, and the cross-member of the sub-frame is rigidly connected to the pair of side frames. The front and rear direction members of the frame are attached to the cross members of the subframe via rubber mounts, brackets are provided at the lower part of the part where the front and rear direction members of the subframe of the side frame are attached, and it is attached to the side frame through the bracket To have.
In the present invention configured as described above, the vehicle body rigidity is improved by the cross member and the side frame. On the other hand, since the sub frame is attached to both ends of the cross member via rubber mounts, vibration transmitted from the suspension to the sub frame is attenuated by the rubber mount, and the NVH performance of the vehicle is improved. As a result, it is possible to achieve both improvement in vehicle body rigidity and interruption of vibration transmission .
Further, in the present invention, a bracket is provided at the lower part of the portion where the front and rear direction members of the subframe of the side frame are attached, and the cross member of the subframe is attached to the side frame via this bracket. Interference with the arrangement member in the engine room can be avoided and the arrangement position of the subframe can be optimized.
In the present invention, preferably, an energy absorbing member is provided at the front end of the front / rear direction member of the subframe so as to protrude forward from the cross member of the subframe.

  According to the vehicle body structure of the present invention, both improvement in vehicle body rigidity and cutoff of vibration transmission can be achieved.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
First, an outline of a vehicle body structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view illustrating a configuration of a bumper beam, a crash can, a front side frame, a sub frame, and the like according to an embodiment of the present invention. FIG. 2 is a front side view of a vehicle body structure according to an embodiment of the present invention. It is a side view showing composition of a frame, a subframe, etc.

  First, as shown in FIG. 1, the vehicle body structure 1 is connected to a bumper beam 2 having a U-shaped cross section extending in the vehicle width direction at the front edge of the vehicle body, and to both ends of the bumper beam 2, respectively. It has a crash can 4 that extends in the longitudinal direction of the vehicle body to absorb the energy of time.

  In the vehicle body structure 1, the crash can 4 is connected to the front-rear direction member 6 a of the front subframe 6. The front subframe 6 is provided with a front suspension (not shown). Further, the vehicle body structure 1 has a cross member 8 having a closed cross section. The cross member 8 extends in the vehicle width direction, and the left and right ends thereof are connected to the front and rear direction members 6a. As will be described later, the cross member 8 functions as a cross member as a constituent member of the front sub-frame 6 or is connected to a front side frame 10 described later. It functions as one cross member. Further, in the front sub-frame 6, the left and right front-rear members 6a are firmly coupled to each other by a cross member (not shown) in the vicinity of the rear end portion of the front-rear member 6a.

  As shown in FIG. 2, the cross member 8 is connected in the vicinity of the front end portion of the front-rear direction member 6 a of the front subframe 6. The cross member 8 is connected to the front side frame 10 via the first bracket 12. Further, the front-rear direction member 6 a of the front sub-frame 6 is connected to the front side frame 10 via the second bracket 14 and the third bracket 16. The second bracket 14 and the third bracket 16 are provided with rubber, and the front-rear direction member 6a is rubber-mounted on the front side frame 10 via these rubbers.

  Next, as shown in FIG. 1, the cross member 8 has cross member connecting portions 8a at both left and right ends thereof, and the front and rear direction members 6a of the front subframe 6 are connected to the cross member connecting portions 8a. The

  Next, referring to FIG. 2 and FIG. 3 to FIG. 5, the connecting structure between the cross member 8 and the front-rear direction member 6a in the cross member connecting portion 8a will be described. 3 is a cross-sectional view of the structure in the vicinity of the cross member connecting portion 8a as viewed from above. FIG. 4 is a structure in the vicinity of the cross member connecting portion 8a as viewed from the front along the line IV-IV in FIG. 5 is a cross-sectional view, and FIG. 5 is a cross-sectional view of the structure in the vicinity of the cross member connecting portion 8a viewed from the side along the line VV in FIG.

  First, as shown in FIGS. 3 to 5, the front-rear direction member 6a is inserted into the cross member connecting portion 8a through the insertion hole 8b and penetrates the cross member connecting portion 8a in the front-rear direction. As shown in FIGS. 3 and 5, the front-rear member 6a is not directly connected to the cross member connecting portion 8a, but has a cylindrical frame portion 18 joined to the front-rear member 6a, and a cylindrical rubber mount. 20, and is connected to the cross member connecting portion 8 a via a cylindrical pipe 22. The frame portion 18, the cylindrical rubber mount 20, and the cylindrical pipe 22 are disposed within the closed cross section of the cross member 8 and are formed so as to extend vertically between the upper and lower surfaces of the cross member 8.

  As shown in FIGS. 2 and 5, the vehicle body structure 1 includes a head portion 24 a provided on the front side frame 10 and penetrating the front side frame 10 in the vertical direction and penetrating the cross member connecting portion 8 a in the vertical direction. 24 and a nut 26 provided on the lower surface of the cross member connecting portion 8a. These bolts 24 and nuts 26 tighten the front side frame 10, the bracket 12, and the cross member connecting portion 8a in the vertical direction, and the cross member connecting portion 8a is tightened and inward thereof as described above. It is supported by a cylindrical pipe 22. Accordingly, the cross member connecting portion 8a and the front side frame 10 on the vehicle body side are rigidly connected to each other, which contributes to improvement of the vehicle body rigidity.

  On the other hand, since the cylindrical rubber mount 20 is provided between the frame portion 18 and the pipe 22 described above, the front-rear direction member 6a is provided with the cross member connecting portion 8a and the front side frame 10 on the vehicle body side. It is not rigidly connected to. Therefore, the vibration transmitted from the front suspension (not shown) to the front subframe 6 is attenuated by the rubber mount 20, and the NVH performance of the vehicle is improved. In particular, as shown in FIG. 5, since the frame portion 18 and the pipe 22 are connected via the rubber mount 20, they can move relatively in the front-rear direction, the left-right direction, and the up-down direction.

  Further, in the vehicle body structure 1 according to the embodiment of the present invention, a pair of front side frames 10 extending in the vehicle longitudinal direction on both sides in the vehicle width direction of the vehicle body, and suspensions (not shown) provided below these front side frames 10. The cross member 8 is rigidly connected to a portion (cross member connecting portion 8a) to which the sub frame is attached via the bracket 12 in the vicinity of the end portion of the front side frame 10. Since the cross member 8 extending in the vehicle width direction is provided so as to connect the pair of front side frames 10 to each other, the cross member 8 and the front side frame 10 improve the vehicle body rigidity.

  On the other hand, the front sub-frame 6 is attached to both ends of the cross member 8 via rubber mounts 20 and is also rubber-mounted by the second bracket 14 and the third bracket 16, so a front suspension (not shown). The vibration transmitted to the front subframe 6 is attenuated by the rubber mount 20 and the rubber mounts of the brackets 14 and 16, and the NVH performance of the vehicle is improved.

  Further, in the embodiment of the present invention, the cross member 8 has a closed cross section, and is provided with an insertion portion 8b through which the front-rear direction member 6a of the subframe 6 can be inserted, and the rubber mount 20 is provided within the closed cross section of the cross member 8. Since the front sub-frame 6 (6a) inserted through the insertion portion 8b is attached to the cross member 8 via the rubber mount 20 in the closed cross section of the cross member 8, the space in the cross member 8 (dead) The layout efficiency can be increased by providing the rubber mount 20 and the like using a space.

  Further, the front / rear direction member 6a of the front subframe 6 is inserted through the insertion portion 8b and penetrates the cross member 8, and the crush can (energy absorbing member) 4 is provided at the front end portion of the front subframe 6. According to the vehicle body structure according to the embodiment of the present invention, it is possible to absorb energy at the time of collision while improving the rigidity by the rigid connection between the cross member 8 and the front side frame 10.

  Further, according to the embodiment of the present invention, the rubber mount 20 is configured to have a pipe 22 (inner cylinder member), and the pipe 22 is inserted between the upper and lower surfaces of the cross member 8 and extends in the vertical direction. Since the member 8 is attached to the front side frame by the bolts 24 penetrating up and down the pipe 22 which is an inner cylinder member, the support rigidity of the rubber mount 20 and the support rigidity of the crash can 4 can be improved. .

  Further, according to the embodiment of the present invention, the bracket 12 is provided at the lower part of the portion (cross member connecting portion 8a) to which the front subframe 6 is attached in the front side frame 10, and the cross member 8 Therefore, it is possible to avoid interference with the arrangement member in the engine room and to optimize the arrangement position of the front sub-frame 6.

  In the embodiment of the present invention, if the cross member 8 is regarded as one member of the front sub-frame 6, the cross-body 8 of the front sub-frame 6 that has been conventionally arranged can be used to increase the rigidity of the vehicle body. In addition, the NVH performance can be improved by the rubber mount 20. On the other hand, no. If it is regarded as one cross member, the vehicle body rigidity is increased by the cross member 8, and the NVH performance can be improved by attaching the front sub-frame 6 to the cross member 8 by the rubber mount 20.

  A modification of the embodiment of the present invention is shown in FIGS. FIG. 6 is a front view (a) and a side view (b) of the vehicle body structure according to the first modification of the embodiment of the present invention as viewed from the front, and FIG. 7 is a second view of the embodiment of the present invention. FIGS. 8A and 8B are a front view and a side view, respectively, of a vehicle body structure according to a modification as viewed from the front, and FIG. 8 is a front view of the vehicle body structure according to the third modification of the embodiment of the present invention as viewed from the front. It is a) and a side view (b).

First, according to the first modification shown in FIG. 6, the front sub-frame 6 is rubber-mounted without penetrating the cross member connecting portion 8a. In this case, the front end portion of the front sub-frame 6 is rubber-mounted, and the fall prevention member 30 may be provided.
Further, according to the second modification shown in FIG. 7, the vertical dimension of the cross member 8 is formed smaller than that of the above-described embodiment, and the front sub-mount is formed on the bottom surface of the cross member 8 via a rubber mount. A frame 6 is attached.
Further, according to the third modification shown in FIG. 8, the recess 8d is formed on the side surface of the cross member 8, and the front sub-frame 6 is mounted in the recess 8d.

It is a perspective view showing composition of a bumper beam, a crush can, a front side frame, a subframe, etc. by a vehicle body structure by an embodiment of the present invention. It is a side view showing composition of a front side frame, a subframe, etc. by a vehicle body structure by an embodiment of the present invention. It is sectional drawing which looked at the structure of the vicinity of the cross member connection part 8a from upper direction. FIG. 4 is a cross-sectional view of a structure in the vicinity of a cross member connecting portion 8a viewed from the front along the line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view of the structure in the vicinity of the cross member connecting portion 8a viewed from the side along the line VV in FIG. 3. It is the front view (a) and side view (b) which looked at the vehicle body structure by the 1st modification of embodiment of this invention from the front. It is the front view (a) and side view (b) which looked at the vehicle body structure by the 2nd modification of embodiment of this invention from the front. It is the front view (a) and side view (b) which looked at the vehicle body structure by the 3rd modification of embodiment of this invention from the front.

Explanation of symbols

4 Crash can 6 Front subframe 6
6a Front / rear direction member of front subframe 8 Cross member 8a Cross member connecting portion 10 Front side frame 12, 14, 16 Bracket 20 Rubber mount 22 Pipe 24 Bolt 26 Nut

Claims (7)

A vehicle body structure comprising a pair of side frames extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the vehicle body, and a sub frame provided below these side frames and supporting a suspension,
A cross member that is rigidly connected to a portion to which the sub-frame is attached in the vicinity of the ends of the pair of side frames and extends in the vehicle width direction so as to connect the pair of side frames to each other;
The sub frame is attached to both ends of the cross member via rubber mounts, and is attached to the pair of side frames via rubber mounts at positions separated from the attachment position in the longitudinal direction of the vehicle body .
A vehicle body structure, wherein a bracket is provided at a lower portion of a portion of the side frame to which the subframe is attached, and the cross member is attached to the side frame via the bracket .   The cross member has a closed cross section and includes an insertion portion through which the sub frame can be inserted.The rubber mount is provided in the closed cross section of the cross member, and the sub frame inserted into the insertion portion has the closed frame. The vehicle body structure according to claim 1, wherein the vehicle body structure is attached to the cross member via a rubber mount in a cross section. The vehicle body structure according to claim 2 , wherein the subframe is inserted through the insertion portion and penetrates the cross member, and an energy absorbing member is provided at a tip portion of the subframe.   The rubber mount includes an inner cylinder member, and the inner cylinder member is inserted between the upper and lower surfaces of the cross member and extends in the vertical direction. The cross member is a bolt that vertically penetrates the inner cylinder member. The vehicle body structure according to any one of claims 1 to 3, wherein the vehicle body structure is attached to the side frame. The vehicle body structure according to claim 1, wherein an energy absorbing member is provided at a front end portion of the subframe so as to protrude forward from the cross member. A vehicle body structure comprising a pair of side frames extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the vehicle body, and a sub frame provided below these side frames and supporting a suspension,
The sub-frame has a longitudinal member extending in the longitudinal direction of the vehicle body and a cross member extending in the vehicle width direction,
The cross member of the subframe is rigidly connected to the pair of side frames,
The front-rear direction member of the subframe is attached to the crossmember of the subframe via a rubber mount ,
A bracket is provided at a lower portion of a portion of the side frame to which the front-rear direction member of the subframe is attached, and a cross member of the subframe is attached to the side frame via the bracket. Body structure. The vehicle body structure according to claim 6, wherein an energy absorbing member is provided at a front end portion of the front-rear direction member of the subframe so as to protrude forward from the cross member of the subframe.

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