JP2019155954A - Vehicular frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure of a vehicle capable of efficiently reinforcing and suppressing deformation of the entire frame. A vehicle has a pair of side members 11 and 12 that extend in the front-rear direction and are arranged at intervals in the vehicle width direction. The side members 11 and 12 have narrow portions 11FS and 12FS on the front side, and central portions 11C and 12C arranged on the rear side and having a wider distance between the side members 11 and 12 than the narrow portion, and the narrow portion and the narrow portion. It has boundaries 11FB, 12FB which are arranged between the central portions and whose spacing becomes wider toward the rear. The vehicle has a first cross member 40 that connects the side members 11 and 12 at the rear ends of the boundary portions 11FB and 12FB, and a second cross member 14 that connects the side members 11 and 12 on the front side of the first cross member 40. And have. The intermediate portion of the first cross member 40 in the vehicle width direction and the second cross member 14 are connected by the connecting members 41 and 42 extending in the front-rear direction. [Selection diagram] Fig. 2

Description

  The present invention relates to a vehicle frame structure.

  As a member constituting the frame, the vehicle has a pair of side members that extend in the longitudinal direction of the vehicle and are arranged at intervals in the vehicle width direction, and a cross member that extends in the vehicle width direction and connects the side members. (See Patent Document 1).

  In the frame structure of Patent Document 1, in order to dispose the wheels and suspension members, the distance between the side members in the end portion (narrow portion) in the front-rear direction of the vehicle is a portion on the vehicle inner side than the same portion ( It is narrower than the above-mentioned distance in the wide portion). And the part (boundary part) which hits the boundary of the wide part of such a side member and a narrow part is extended in the aspect from which the said space | interval becomes wide toward the wide part.

  Further, in the frame structure of Patent Document 1, a cross member is provided in a wide portion where the distance between the side members is wide for reinforcing the frame, and a reinforcing member for connecting the cross member and the boundary portion of the side member is provided. Is provided.

JP, 2006-215716, A

  The said frame structure has a boundary part of the shape where the space | interval of side members becomes large as it goes to the wide part on the vehicle inside side from the narrow part on the vehicle end part side. Therefore, when the vehicle collides in the front-rear direction (front collision or rear collision), due to the shape of the boundary portion, the narrow portion that is the portion of the side member on the vehicle end side is closer to the interval. On the other hand, the shape of the entire frame is deformed such that the wide portion, which is the portion of the side member inside the vehicle, is deformed so as to open the gap.

  In order to suppress such deformation, it is conceivable to reinforce with a reinforcing member as in the frame structure of Patent Document 1. However, if the frame is simply reinforced, the weight of the entire frame increases accordingly, which is not preferable.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle frame structure capable of efficiently reinforcing and suppressing deformation of the entire frame.

  A vehicle frame structure for solving the above-mentioned problems is a pair of side members extending in the vehicle longitudinal direction and arranged at intervals in the vehicle width direction, and constitutes one end side in the vehicle longitudinal direction. A narrow portion, a wide portion that is disposed on the vehicle interior side with respect to the narrow portion, and the distance between the pair of side members is wider than the narrow portion, and the narrow portion and the wide portion The side member having a boundary portion disposed between and extending toward the wide portion, and extending in the vehicle width direction, and the pair of side members at one of the wide portion and the boundary portion A first cross member constructed between the first cross member, a second cross member extending in the vehicle width direction and constructed between the pair of side members on the end side of the first cross member; It extends to both the front and rear direction, and a connecting member connecting the intermediate portion and the second cross member in the vehicle width direction of the first cross member.

  In the above configuration, in the event of a collision in the front-rear direction of the vehicle, a force in a direction to close the gap between the side members acts on the narrow part of the side members due to the shape of the boundary part of the side members. Since the formed second cross member functions like a support bar, the narrow portion of the side member can be prevented from being deformed so as to close the gap.

  Further, in the above configuration, due to the collision, a force (hereinafter referred to as a pulling force) in a direction of opening the gap between the side members acts on the wide portion of the side member due to the shape of the boundary portion of the side member. However, the first cross member erected on the wide portion of the side member can prevent the narrow portion from being deformed to open the gap.

  In addition, in the above configuration, when a force toward the vehicle inner side is applied to the second cross member during the collision, the force is transmitted to the intermediate portion in the vehicle width direction of the first cross member via the connecting member. Become. Since the first cross member bends due to this load, the length of the first cross member in the vehicle width direction is shortened accordingly, and the connecting portion between the first cross member (specifically, its end) and the side member. Therefore, a force (hereinafter referred to as an attractive force) acting in a direction in which the side members are attracted to each other is generated. And since this attraction force and the said pulling-off force can be offset, the deformation | transformation to the direction which the space | interval of the wide part of a side member opens can also be suppressed by this.

  As described above, according to the above configuration, the wide portion of the side member can be obtained by canceling the pulling force that is caused by the shape of the boundary portion and the attractive force that is exerted by flexing the first cross member. Can be prevented from being deformed. Therefore, it is possible to efficiently reinforce the frame by utilizing the force acting on the frame in the event of a vehicle collision, and to suppress deformation of the entire frame.

  The frame structure includes a pair of submembers extending along the side members so as to be aligned with the pair of side members in the vehicle vertical direction, and a support portion on the vehicle inner side supported by the second cross member.

  According to the above configuration, in the event of a collision in the front-rear direction of the vehicle, when a load toward the vehicle interior acts on the sub member, the load is transmitted to the first cross member via the second cross member and the connecting member. become. Accordingly, the first cross member is easily bent at the time of the collision, so that the attractive force is easily generated at the connecting portion between the first cross member and the side member.

  In the frame structure, it is preferable that the connecting member is provided corresponding to each of the pair of submembers and extends from the support portion of the submember toward the first cross member.

  According to the above configuration, the load applied to the sub member at the time of the collision is compared to the position where the connecting member of the second cross member is connected to the position of the support portion of the sub member. The structure can be easily transmitted to the cross member.

In the frame structure, it is preferable that the sub member and the connecting member corresponding to the sub member extend on the same straight line when viewed from above the vehicle.
According to the above configuration, compared to a configuration in which the sub member and the connecting member are not on the same straight line when viewed from above the vehicle, a structure in which the load applied to the sub member at the time of the collision is easily transmitted to the connecting member and the first cross member. can do.

  The frame structure is applied to an electric vehicle in which a driving battery is disposed in a manner sandwiched between the pair of side members in the wide portion, and the connecting member and the first cross member extend below the battery. ing.

  According to the said structure, a connection member and a 1st cross member can be utilized as a protection member which covers and protects the lower part of a battery.

  According to the vehicle frame structure of the present invention, it is possible to efficiently reinforce and suppress deformation of the entire frame.

The perspective view of the flame | frame to which the frame structure of the vehicle of one Embodiment is applied. The top view of the front part of the frame. The front view of the front part of the frame. The side view of the front part of the frame. The schematic diagram which shows the positional relationship of a connection member, a 1st cross member, and a battery. 1 is a schematic diagram showing a force applied to a frame when a vehicle collides forward. The schematic diagram which shows schematic structure of the front part of the flame | frame of a modification. The schematic diagram which shows schematic structure of the front part of the flame | frame of a modification. The schematic diagram which shows schematic structure of the front part of the flame | frame of a modification.

Hereinafter, an embodiment of a vehicle frame structure will be described.
As shown in FIG. 1, a ladder-type frame (so-called ladder frame) is adopted as the main frame 10 of the vehicle of this embodiment. A vehicle to which the frame structure of the present embodiment is applied is a kind of ultra-compact mobility, and is a single-seater electric vehicle.

  The main frame 10 is arranged with a pair of side members (a right side member 11 and a left side member 12) extending in a square tube shape in the front-rear direction of the vehicle and spaced apart in the vehicle width direction, and spaced in the front-rear direction. And a plurality of (seven in this embodiment) cross members 13, 14, 15 extending in the vehicle width direction.

  Rear wheels (not shown) of the vehicle are arranged on both sides of the rear portion 10R of the main frame 10. In the rear portion 10R of the main frame 10, the rear side portions (the narrow portions 11RS, 12RS) of the side members 11, 12 extend in the horizontal direction (specifically, the direction parallel to the road surface), and the side members 11, 12 Front side portions (boundary portions 11RB, 12RB) extend obliquely downward and obliquely outward from the rear to the front. In the present embodiment, at the boundary portions 11RB and 12RB of the side members 11 and 12, the distance between the side members 11 and 12 becomes wider toward the front. A plurality of (three in this embodiment) cross members 13 are fixed to the narrow portions 11RS, 12RS of the side members 11, 12 so as to connect the side members 11, 12.

  A central portion 10C of the main frame 10 is disposed below a vehicle cabin (not shown). In the central portion 10C of the main frame 10, the side members 11 and 12 extend in the horizontal direction, and the vehicle widths of the side members 11 and 12 as compared with the other portions (the rear portion 10R and the front portion 10F) of the main frame 10. Spacing in the direction is wide. In the present embodiment, the portions corresponding to the central portion 10C (the central portions 11C and 12C) of the side members 11 and 12 are disposed on the vehicle inner side (rear side) than the narrow portion, and the pair of side members 11 and 12 are disposed. This corresponds to a wide portion where the distance between them is wider than the narrow portion.

  Front wheels (not shown) are arranged on both sides of the front portion 10F of the main frame 10. In the front portion 10F of the main frame 10, the front portions (the narrow portions 11FS, 12FS) of the side members 11, 12 extend in parallel in the horizontal direction, and the rear portions (boundary portions) of the side members 11, 12 11FB, 12FB) extends diagonally downward and diagonally outward from the front to the rear. In the present embodiment, at the boundary portions 11FB and 12FB of the side members 11 and 12, the distance between the side members 11 and 12 becomes wider toward the rear. A plurality of (two in this embodiment) cross members 13 are fixed to the narrow portions 11FS and 12FS of the side members 11 and 12 so as to connect the side members 11 and 12 to each other.

  A pair of outriggers 17 are disposed outside the side members 11 and 12 in the vehicle width direction at positions sandwiching the side members 11 and 12 therebetween. Each outrigger 17 extends in the front-rear direction at a position spaced from the side members 11, 12.

  A circular tubular second cross member 14 extending linearly in the vehicle width direction is provided at a position corresponding to the boundary portions 11FB and 12FB in the front portion 10F of the main frame 10. A circular second cross member 15 extending linearly in the vehicle width direction is provided at a position corresponding to the boundary portions 11RB and 12RB in the rear portion 10R of the main frame 10. The second cross members 14, 15 are fixed to the side members 11, 12 and the outrigger 17 in such a manner as to penetrate the pair of side members 11, 12 and the pair of outriggers 17. As described above, the second cross members 14 and 15 are constructed so as to integrally connect the pair of side members 11 and 12 and the pair of outriggers 17. Further, a connecting portion 18 that connects the side members 11, 12 and the outrigger 17 is integrally fixed between the side members 11, 12 and the outrigger 17.

  As shown in FIGS. 1 to 4, a ladder-type subframe 20 is provided below the side members 11 and 12 in the front portion 10 </ b> F of the main frame 10. In the present embodiment, the front portion 10F of the main frame 10 and the sub frame 20 are arranged so as to be aligned in the vertical direction.

  The subframe 20 has a pair of submembers (a right submember 21 and a left submember 22) that extend in the front-rear direction at intervals in the vehicle width direction. The rear side portions (support portions 21R and 22R) of the sub members 21 and 22 are fixed to the second cross member 14 with the second cross member 14 provided in the main frame 10 passing therethrough. A cross member 24 that connects the sub members 21 and 22 is fixed at an intermediate position in the front-rear direction of the sub members 21 and 22.

  As shown in FIG. 2, when the front portion 10F and the subframe 20 of the main frame 10 are viewed from above the vehicle, a line L1 that is the center in the vehicle width direction of the portion sandwiched between the pair of side members 11 and 12 And the pair of submembers 21 and 22 are arranged so that the line L2 that is the center in the vehicle width direction of the portion sandwiched between the pair of submembers 21 and 22 matches.

  As shown in FIGS. 1 to 4, a connecting member 30 that extends in a U shape in a front view when the vehicle is viewed from the front is fixed to the front portion 10 </ b> F of the main frame 10. The connection member 30 has a lateral connection portion 31 extending in the horizontal direction so as to couple the pair of submembers 21 and 22 together. The connecting member 30 includes a right vertical connecting portion 32 extending in the vertical direction so as to connect the right side member 11 and the right submember 21 aligned in the vertical direction on the right side of the vehicle, and the left side member 12 aligned in the vertical direction on the left side of the vehicle. And a left vertical connecting portion 33 extending in the vertical direction so as to connect the left submember 22.

  The upper end of the right vertical connection portion 32 is fixed to the lower surface of the right side member 11, and the lower portion of the right vertical connection portion 32 is formed integrally with the right end portion of the horizontal connection portion 31. The upper end of the left vertical connection portion 33 is fixed to the lower surface of the left side member 12, and the lower portion of the left vertical connection portion 33 is formed integrally with the left end portion of the horizontal connection portion 31. The lateral connection portion 31 is disposed so that the right end portion covers the front end surface of the right submember 21 and the left end portion covers the front end surface of the left submember 22, and is fixed to the submembers 21 and 22.

  In the present embodiment, the vehicle drive battery 19 (FIG. 2) is placed in a substantially square space surrounded by the pair of side members 11 and 12 and the two second cross members 14 and 15. 12 (see FIG. 2).

The vehicle of this embodiment is provided with a first cross member 40, a right connecting member 41, and a left connecting member 42 in order to suppress deformation of the entire frame.
The first cross member 40 is provided between the pair of side members 11 and 12 (specifically, rear ends of the boundary portions 11FB and 12FB) in the front portion 10F of the main frame 10. Specifically, the first cross member 40 extends in a quadrangular tubular shape in the vehicle width direction, and one end is fixed to the rear end of the boundary portion 11FB of the right side member 11, and the other end is the left side. The member 12 is fixed to the rear end of the boundary portion 12FB.

  One connecting member 41, 42 is provided corresponding to each of the pair of submembers 21, 22. The connecting members 41 and 42 are arranged so as to be arranged at intervals in the vehicle width direction, and each extend in a square tube shape in the front-rear direction.

  The right connecting member 41 disposed on the right side of the vehicle has a front end fixed to the support portion 21 </ b> R of the right submember 21 and a rear end fixed to the first cross member 40. By the right connecting member 41, the intermediate portion of the first cross member 40 in the vehicle width direction and the second cross member 14 (specifically, the support portion 21R of the right sub member 21) are connected. In this embodiment, as shown in FIG. 2, the right submember 21 and the right connecting member 41 are arranged so as to extend on the same straight line when viewed from above the vehicle.

  As shown in FIGS. 1 to 4, the left connecting member 42 disposed on the left side of the vehicle has a front end fixed to the support portion 22 </ b> R of the left submember 22 and a rear end fixed to the first cross member 40. . The left connecting member 42 connects the intermediate portion of the first cross member 40 in the vehicle width direction and the second cross member 14 (specifically, the support portion 22R of the left sub member 22). In the present embodiment, as shown in FIG. 2, the left submember 22 and the left connecting member 42 are arranged so as to extend on the same straight line when viewed from above the vehicle.

  As shown in FIG. 5, the first cross member 40 and the connecting members 41 and 42 extend below the battery 19 (see FIG. 2). Accordingly, the first cross member 40 and the connecting members 41 and 42 function as protective members that cover and protect the lower portion of the battery 19.

  In the present embodiment, the first cross member 40 and the connecting members 41 and 42 can be attached to or removed from the vehicle from below so that the battery 19 can be attached and detached from below the vehicle.

  Specifically, the rear ends of the connecting members 41 and 42 are fixed to an intermediate portion of the first cross member 40 in the vehicle width direction, and the first cross member 40 and the connecting members 41 and 42 are integrated. . The first cross member 40 and the connecting members 41 and 42 are attached to the vehicle through bolt fastening at four locations. Specifically, the front end of the right connecting member 41 is fixed to the lower portion of the support portion 21R of the right submember 21, the front end of the left connecting member 42 is fixed to the lower portion of the support portion 22R of the left submember 22, and the right side of the first cross member 40 The end portion is fixed to the lower portion of the right side member 11, and the left end portion of the first cross member 40 is fixed to the lower portion of the left side member 12.

  When the battery 19 is removed from the vehicle, the first cross member 40 and the connecting members 41 and 42 are removed from the lower part of the vehicle, and the battery 19 is released from the vehicle, and then the battery 19 is lowered. On the other hand, when the battery 19 is attached to the vehicle, the battery 19 is inserted into the vehicle from below and fixed to the vehicle, and then the first cross member 40 and the connecting members 41 and 42 are fixed to the lower portion of the vehicle.

(Function)
Hereinafter, the operational effects of the frame structure of the present embodiment will be described.
As shown in FIG. 6, in the frame structure of the present embodiment, since the side members 11 and 12 have boundary portions 11FB and 12FB, the front ends of the side members 11 and 12 are the center of the side members 11 and 12, respectively. It is arrange | positioned inside the vehicle width direction rather than the parts 11C and 12C. Therefore, in the front part of the side members 11 and 12, the load point (front end of the side members 11 and 12) on which the collision load P1 from the front of the vehicle acts is a support point that supports the front part (the center of the side members 11 and 12). It is on the inner side in the vehicle width direction than the portions 11C, 12C).

  As a result, during a frontal collision of the vehicle, a force (arrow P2 in the figure) for deforming the pair of side members 11 and 12 so as to close the front end toward the inner side in the vehicle width acts. A force (arrow P3 in the figure) for deforming 11C and 12C to open outward in the vehicle width direction is applied. That is, at this time, the force P2 in the direction of reducing the distance between the side members 11 and 12 acts on the narrow portions 11FS and 12FS of the side members 11 and 12, while the central portion 11C of the side members 11 and 12 is applied. , 12C, a force (separation force) P3 in the direction of opening the space between the side members 11, 12 acts.

  In the present embodiment, a second cross member 14 is installed between the side members 11 and 12 (specifically, the boundary portions 11FB and 12FB), and the second cross member 14 is a support bar between the side members 11 and 12. To function like. Therefore, in the event of a frontal collision of the vehicle, although the force P2 in the direction of reducing the distance between the side members 11 and 12 acts on the narrow portions 11FS and 12FS of the side members 11 and 12, the function of the second cross member 14 is used. Further, the narrow portions 11FS and 12FS of the side members 11 and 12 can be prevented from being deformed so as to close the gap between the side members 11 and 12.

  In the present embodiment, the first cross member 40 is installed between the rear portions of the side members 11 and 12 with respect to the second cross member 14 (specifically, the rear ends of the boundary portions 11FB and 12FB). The first cross member 40 functions to regulate the separation between the side members 11 and 12. Therefore, in the event of a frontal collision of the vehicle, although the pulling force P3 in the direction of opening the space between the side members 11 and 12 acts on the central portions 11C and 12C of the side members 11 and 12, the function of the first cross member 40 is described. Thus, the central portions 11C and 12C of the side members 11 and 12 can be prevented from being deformed so as to open a space therebetween.

  In addition, in the frame structure of the present embodiment, as indicated by the solid arrows in FIG. 5, when a force directed toward the rear of the vehicle is transmitted to the second cross member 14 in the event of a frontal collision of the vehicle, the force is connected. The first cross member 40 is transmitted to the intermediate portion in the vehicle width direction via the members 41 and 42. Then, the first cross member 40 is bent by this force as shown by a broken line in FIG. 5, and thus the length of the first cross member 40 in the vehicle width direction (vertical direction in FIG. 5) is shortened accordingly. . As a result, a force acting on the connecting portion between the first cross member 40 and the side members 11 and 12 in a direction in which the side members 11 and 12 are attracted to each other (hereinafter referred to as an attractive force [arrow P4 in the figure]). Comes to occur. According to the present embodiment, the attraction force P4 and the pulling force P3 can be offset, so that the deformation in the direction in which the distance between the central portions 11C and 12C of the side members 11 and 12 is also increased. Can be suppressed. In FIG. 5, in order to facilitate understanding of the principle of generation of the attractive force P <b> 4, the amount of bending of the first cross member 40 is shown exaggerated from the actual amount of bending.

  Thus, according to the present embodiment, the pulling force P3 that acts due to the shape of the boundary portions 11FB and 12FB of the side members 11 and 12 and the attractive force that acts by flexing the first cross member 40. By canceling out P4, deformation of the central portions 11C and 12C of the side members 11 and 12 can be suppressed. Therefore, it is possible to efficiently reinforce the frame by using a load acting on the frame at the time of a frontal collision of the vehicle, and to suppress deformation of the entire frame.

  Further, the frame structure of this embodiment includes submembers 21 and 22 extending along the side members 11 and 12 so as to be aligned with the side members 11 and 12 in the vertical direction, and support portions on the rear side of the submembers 21 and 22. 21R and 22R are supported by the second cross member 14. Therefore, when a collision load P1 is applied to the front ends of the submembers 21 and 22 during a frontal collision of the vehicle, the load P1 is transmitted to the first crossmember 40 via the second crossmember 14 and the connecting members 41 and 42. become. Accordingly, the first cross member 40 and the side members 11 and 12 are connected to each other because the first cross member 40 is easily bent at the time of a frontal collision of the vehicle as compared with the case where the sub members 21 and 22 are not provided. A structure in which the attracting force P4 is easily generated in the portion can be obtained.

  Further, in the present embodiment, the right submember 21 and the right connecting member 41 extending from the support portion 21R of the right submember 21 toward the rear side extend on the same straight line when viewed from the upper side of the vehicle. A left connecting member 42 extending from the support portion 22R of the sub member 22 toward the rear side extends on the same straight line when viewed from above the vehicle.

  Therefore, a path in which the collision load P1 acting on the front ends of the submembers 21 and 22 during a frontal collision of the vehicle forms a straight line when viewed from above the vehicle (the right submember 21 → the right connecting member 41 or the left submember 22 → the left connecting member 42). Through the first cross member 40. Therefore, according to the present embodiment, when the collision load P1 is applied to the submembers 21 and 22 in the case of a frontal collision of the vehicle, the collision load P1 is easily transmitted to the connecting members 41 and 42 and the first cross member 40. be able to.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the first cross member 40 and the connecting members 41 and 42 are provided, the frame is efficiently reinforced by using a load acting on the frame at the time of a forward collision of the vehicle, and the entire frame is deformed. Can be suppressed.

  (2) Sub-members 21 and 22 extending along the side members 11 and 12 so as to line up with the side members 11 and 12 are provided, and support portions 21R and 22R on the rear side of the sub-members 21 and 22 are second. It is supported by the cross member 14. Therefore, as compared with a structure in which the sub members 21 and 22 are not provided, the attraction force P4 can be easily generated at the connecting portion between the first cross member 40 and the side members 11 and 12.

  (3) The right connecting member 41 extends rearward from the support portion 21R of the right submember 21, and the left connecting member 42 extends rearward from the support portion 22R of the left submember 22. Therefore, compared with the case where the connecting position of the connecting members 41 and 42 in the second cross member 14 and the connecting position of the support portions 21R and 22R of the sub members 21 and 22 are deviated, it collides with the sub members 21 and 22 in the front collision. When the load P <b> 1 is applied, the structure is such that the collision load P <b> 1 is easily transmitted to the connecting members 41 and 42 and the first cross member 40.

  (4) The right submember 21 and the right connecting member 41 extend on the same straight line when viewed from above the vehicle, and the left submember 22 and the left connecting member 42 extend on the same straight line when viewed from above the vehicle. Therefore, compared to a configuration in which the sub members 21 and 22 and the connecting members 41 and 42 are not on the same straight line when viewed from above the vehicle, the collision load P1 applied to the sub members 21 and 22 in the frontal collision is less than the connecting members 41 and 42 and The structure can be easily transmitted to the first cross member 40.

  (5) In the vehicle in which the battery 19 is disposed in a manner that is sandwiched between the pair of side members 11 and 12, the first cross member 40 and the connecting members 41 and 42 are disposed in a manner that extends below the battery 19. Therefore, the connecting members 41 and 42 and the first cross member 40 can be used as a protective member that covers and protects the lower portion of the battery 19.

<Modification>
The above embodiment may be modified as follows.
-The shape of the 1st cross member 40 and the shape of the connection members 41 and 42 can be changed into arbitrary shapes, such as a circular tube shape, a cross-section U-shape, and a cross-sectional wave shape. In short, the shapes of the connecting members 41 and 42 and the first cross member 40 may be any shape that can withstand a collision load acting upon a vehicle collision.

  The first cross member 40 and the connecting members 41 and 42 may be arranged in a manner that extends above the battery 19 or may be arranged in a manner that extends in front of the battery 19.

-You may make it fix the 1st cross member 40 and the connection members 41 and 42 to a vehicle so that attachment or detachment is impossible.
As shown in an example in FIG. 7, the connecting members 51 and 52 that connect the second cross member 14 (specifically, the support portions 21R and 22R of the sub members 21 and 22) and the first cross member 40 toward the rear side. It is possible to extend in such a manner that the position is inside (or outside) in the vehicle width direction. As shown in FIG. 7, when the connecting members 51 and 52 are extended in a manner to be located at the inner side in the vehicle width direction toward the rear side, between the second cross member 14 and the first cross member 40, The inclination in the extending direction of the right side member 11 and the inclination in the extending direction of the right connecting member 41 with respect to the straight traveling direction of the vehicle are substantially the same, or the inclination of the left side member 12 and the inclination of the left connecting member 42 with respect to the straight traveling direction. May be substantially the same. According to such a configuration, the force acting on the second cross member 14 in the case of a forward collision (see the black arrow in FIG. 6) is applied to the left side of the vehicle via the right side member 11 and the right connecting member 41 on the right side of the vehicle. Then, it becomes possible to transmit to the first cross member 40 through the left side member 12 and the left connecting member 42 in a stable state in which deviation in the vehicle width direction is suppressed.

  As shown in FIG. 8, the rear end of the right connecting member 61 extending rearward from the support portion 21R of the right submember 21 and the rear end of the left connecting member 62 extending rearward from the support portion 22R of the left submember 22 Both may be fixed to the center position of the first cross member 40 in the vehicle width direction. The center position is a position where the amount of bending of the first cross member 40 is likely to increase when a force directed toward the rear side is applied as compared with other positions. According to the above configuration, since the rear ends of the connecting members 61 and 62 are fixed at such a central position, the force (see the black arrow in FIG. 6) generated due to the frontal collision of the vehicle is the connecting member 61. , 62, the first cross member 40 can be easily bent by the force.

  -Instead of fixing the front ends of the connecting members 41 and 42 to the support portions 21R and 22R of the sub members 21 and 22, they are fixed to portions of the second cross member 14 other than the portion to which the support portions 21R and 22R are connected. You may make it do.

  The first cross member 40 is installed between the central portions 11C and 12C of the side members 11 and 12, and the second cross member 14 is installed between the narrow portions 11FS and 12FS of the side members 11 and 12. be able to. The point is that the distance between the side members 11 and 12 in the portion where the second cross member 14 is disposed is smaller than the distance between the side members 11 and 12 in the portion where the first cross member 40 is disposed. May be disposed on the front side of the first cross member.

  -The frame structure of the said embodiment is applicable also to the vehicle which does not have the sub-frame 20. FIG. An example of such a frame structure is shown in FIG. In the example shown in FIG. 9, a pair of connecting members 71, 72 arranged at intervals in the vehicle width direction are provided, and these connecting members 71, 72 connect the second cross member 14 and the first cross member 40. It extends in the longitudinal direction of the vehicle so as to be connected. The right connecting member 71 extends rearward from the vicinity of the connecting portion of the second cross member 14 to the right side member 11, and the left connecting member 72 is connected to the left side member 12 of the second cross member 14. It extends toward the rear side from the vicinity of the connecting portion.

  As shown by a broken line in FIG. 9, the front end of the right connecting member 81 is fixed in the vicinity of the connecting portion of the second cross member 14 with the right side member 11, and the front end of the left connecting member 82 is fixed to the second cross member 14. The rear end of the connecting members 81 and 82 may be fixed at the center position of the second cross member 14. According to such a configuration, the truss structure in which the portion where the connecting members 81 and 82 are disposed is configured by the connecting members 81 and 82, the side members 11 and 12, the second cross member 14, and the first cross member 40. Can be. Thereby, the rigidity of the whole flame | frame can be made high and the deformation | transformation can be suppressed suitably.

Only one connecting member that connects the second cross member 14 and the first cross member 40 may be provided, or three or more connecting members may be provided.
-The frame structure of the said embodiment is not restricted to applying to a vehicle front part, It can also apply to a vehicle rear part. In this case, the first cross member that connects the side members 11, 12 at the rear of the second cross member 15 at one of the central portions 11C, 12C of the side members 11, 12 and the boundary portions 11RB, 12RB, and the front-rear direction And a connecting member for connecting the second cross member 15 and the intermediate portion of the first cross member in the vehicle width direction. According to such a configuration, it is possible to efficiently reinforce the frame by using a load acting on the frame at the time of a rear collision of the vehicle, and to suppress deformation of the entire frame.

  The frame structure of the above embodiment can be applied to a two-seater ultra-compact mobility, a motorbike, a small car, and the like.

  DESCRIPTION OF SYMBOLS 10 ... Main frame, 10R ... Rear part, 10C ... Center part, 10F ... Front part, 11 ... Right side member, 11C ... Center part, 11RS, 11FS ... Narrow part, 11RB, 11FB ... Border part, 12 ... Left side member , 12C: central portion, 12RS, 12FS ... narrow portion, 12RB, 12FB ... boundary portion, 13 ... cross member, 14, 15 ... second cross member, 17 ... outrigger, 18 ... connection portion, 19 ... battery, 20 ... Subframe, 21 ... right submember, 21R ... support portion, 22 ... left submember, 22R ... support portion, 24 ... cross member, 30 ... connection member, 31 ... lateral connection portion, 32 ... right vertical connection portion, 33 ... left vertical 40, first cross member, 41, 51, 61, 71, 81 ... right side connecting member, 42, 52, 62, 72, 82 ... left side connecting member.

Claims (5)

A pair of side members extending in the vehicle front-rear direction and arranged at intervals in the vehicle width direction, and a narrow portion constituting one end side in the vehicle front-rear direction, and the vehicle more than the narrow portion A wide portion that is disposed on the inner side and has a wider interval between the pair of side members than the narrow portion, and is disposed between the narrow portion and the wide portion, and the interval is directed toward the wide portion. The side member having a boundary portion that widens with
A first cross member extending between the pair of side members at one of the wide portion and the boundary portion, and extending in the vehicle width direction;
A second cross member extending between the pair of side members on the end side of the first cross member and extending in the vehicle width direction;
A frame structure for a vehicle that extends in the vehicle front-rear direction and includes a connecting member that connects an intermediate portion of the first cross member in the vehicle width direction and the second cross member.   2. The vehicle according to claim 1, wherein the pair of side members includes a pair of submembers that extend along the side members so as to be aligned in the vehicle vertical direction, and a support portion on the vehicle interior side is supported by the second cross member. Vehicle frame structure. 3. The vehicle frame structure according to claim 2, wherein each of the connecting members is provided corresponding to each of the pair of sub-members and extends from the support portion of the sub-member toward the first cross member. . The vehicle frame structure according to claim 3, wherein the sub member and the connecting member corresponding to the sub member extend on the same straight line when viewed from above the vehicle. The frame structure is applied to an electric vehicle in which a battery for driving is arranged in a manner of being sandwiched between the pair of side members in the wide portion, and the connecting member and the first cross member extend below the battery. The vehicle frame structure according to any one of claims 1 to 4.