JP2024042059A - vehicle frame structure - Google Patents

Abstract

[Problem] To provide a vehicle frame structure capable of reducing the intrusion of a cabin frame into an occupant space even when a collision load is applied from the front. [Solution] A front cabin frame 10 has a pair of left and right lower side members 50 extending in the vehicle longitudinal direction, a pair of left and right first front vertical members 11 extending upward from near the front ends of the lower side members 50, a first front transverse member 13 extending in the vehicle width direction and connecting the upper ends of the first front vertical members 11, and a connecting member 60 connecting the first front vertical member 11 and a front side frame 20. With a plane PF including the front side frame 20 disposed approximately parallel to a plane PM including the lower side members 50, the rear end of the front side frame 20 is connected to approximately the center in the up-down direction of the first front vertical member 11 via the connecting member 60. [Selected Figure] Figure 1

Description

Application for application of Article 30, Paragraph 2 of the Patent Act has been filed Announced at the "46th Tokyo Motor Show 2019" from October 24th to November 4th, 2020

The present invention relates to a vehicle frame structure.

BACKGROUND ART Various improvements regarding vehicle frame structures have been proposed and put into practical use. For example, a vehicle frame structure that has high rigidity and strength against collision loads from the front is currently being proposed (see Patent Document 1). According to this technique, by connecting the rocker, floor frame, under-floor cross member, and rear side member to each other at the same location, the bonding strength of the floor frame, rocker, under-floor cross member, and rear side member, which are so-called skeletal members, can be increased. It is said that the strength and rigidity of these members can be improved.

JP 2018-52499 Publication

Incidentally, in recent years, the development of frame structures for two-seater open sports car-type vehicles has been progressing. The conventional frame structure of such a vehicle includes, for example, a cabin frame 100 disposed in front of the passenger compartment of the vehicle, and a frame structure attached to the front of the cabin frame 100 extending in the longitudinal direction of the vehicle, as shown in FIGS. 8 to 10, for example. A pair of left and right side frames 20
It is equipped with 0 and . The cabin frame 100 includes a pair of left and right lower side members 110 extending in the longitudinal direction of the vehicle, a pair of left and right first vertical members 120 extending upward from near the front end of each lower side member 110, and each lower side member. A pair of left and right second vertical members 130 extend upward from a position slightly rearward than the front end of the first vertical member 110, and a first vertical member 130 extends in the vehicle width direction and connects the upper ends of the first vertical members 120. A horizontal member 140, a second horizontal member 150 that extends in the vehicle width direction and connects the upper ends of the second vertical member 130, and a second horizontal member 150 that connects the upper ends of the first vertical member 120 and the second vertical member on each of the left and right sides. 130, and an upper side member 160 that connects the upper end of the upper side member 130, and is formed into a substantially rectangular box shape by these members.

In such a conventional frame structure, when a collision load is applied from the front end side of the pair of left and right side frames 200, the upper end position of the cabin frame 100 (the upper end of the second vertical member 130 and the The problem is that _PJ (near the joining position of the second horizontal member 150 and the upper side member 160) moves backward significantly, and a part of the cabin frame 100 invades the internal space (passenger space) C of the passenger compartment of the vehicle. was there. Therefore, there is a long-awaited development of a frame structure that can reduce the amount of intrusion of the cabin frame 100 into the passenger space C even if a collision load is applied from the front in a two-seater open sports car type vehicle. Ta.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a frame structure for a vehicle that can reduce the amount of intrusion of the cabin frame into the passenger space even when a collision load is applied from the front. do.

In order to achieve the above object, the frame structure of a vehicle according to the present invention includes a front cabin frame disposed in front of a passenger compartment of the vehicle, and a pair of left and right frames attached to the front of the front cabin frame and extending in the longitudinal direction of the vehicle. The front cabin frame includes a pair of left and right side members extending in the longitudinal direction of the vehicle, and a front side frame of each side member extending upward from near the front end of each side member. a pair of left and right front vertical members joined to the front end; a front horizontal member extending in the vehicle width direction and connecting the upper ends of the front vertical members; and a connecting member connecting the front vertical member and the front side frame; The front side frame is arranged so that the plane passing through the center in the vertical direction is approximately parallel to the plane passing through the lower end of the side member, and the rear end extends forward vertically through the front connecting member. It is connected to the substantially central portion of the member in the vertical direction.

When such a configuration is adopted, the rear end of the front side frame is connected to the rear end of the front side frame via the connecting member with the plane passing through the center of the front side frame in the vertical direction being approximately parallel to the plane passing through the lower end of the side member. and is connected to approximately the vertical center of the front vertical member. Therefore, when an impact load is applied from the front to the front side frame, the impact load is transmitted to approximately the vertical center of the front vertical member of the front cabin frame, and the impact load is transmitted to the approximately vertical center of the front vertical member of the front cabin frame. By deforming the part backwards, the impact can be efficiently absorbed. Therefore, when an impact load is applied to the front side frame from the front, the upper part of the front cabin frame can be prevented from curving backward and intruding into the passenger space, thereby ensuring the safety of the occupants. I can do it.

In the frame structure of a vehicle according to the present invention, the rear end of the front side frame is connected via the connecting member to a position below the vertical center of the front vertical member and not joined to the side member. (not connected at the joint position between the front vertical member and the side member).

When such a configuration is adopted, the rear end of the front side frame is connected via the connecting member to a position below the vertical center of the front vertical member and not joined to the side member (front end). (The vertical member and the side member are not connected at the joint position.) Therefore, the impact load from the front applied to the front side frame is transmitted to the lower part of the front vertical member, not to the side member, via the connecting member. Therefore, the front vertical member can be deformed to efficiently absorb the front impact load.

The vehicle frame structure according to the present invention further includes a rear cabin frame disposed behind the passenger compartment, and a pair of left and right rear side frames attached to the rear of the rear cabin frame and extending in the longitudinal direction of the vehicle. The rear cabin frame includes a side member, a pair of left and right rear vertical members joined to the rear end of each side member so as to extend upward from near the rear end of each side member, and a rear cabin frame that extends in the vehicle width direction. and a rear horizontal member extending to connect the upper ends of the rear vertical members. In such a case, with the rear side frame arranged so that the plane passing through the vertical center of the rear side frame is approximately parallel to the plane passing through the lower end of the side member, the front end of the rear side frame is attached to the rear horizontal member. Can be joined. Also, the distance from the plane passing through the lower end of the side member to the plane passing through the vertical center of the rear side frame is the distance from the plane passing through the lower end of the side member to the plane passing through the vertical center of the front side frame. They can be the same.

When such a configuration is adopted, the distance from the plane passing through the lower end of the side member to the plane passing through the vertical center of the rear side frame is equal to the distance from the plane passing through the lower end of the side member to the plane passing through the vertical center of the front side frame. The distance can be set to be approximately the same as the distance. That is,
The rear side frame is placed on the same plane as the front side frame (approximately at the vertical center of the front cabin frame), and the side frame is arranged linearly from the front to the rear when viewed from the side. The impact load applied from the front can be absorbed more efficiently.

In the vehicle frame structure according to the present invention, the side members already described are the lower side members disposed below the passenger compartment, the front vertical members already described are the first front vertical members, and the front lateral members are the first front longitudinal members. The member can be a first forward lateral member. In such a case, the front cabin frame includes a pair of left and right second front vertical members joined to each lower side member at a position slightly rearward than the front end of each lower side member so as to extend upwardly from the front end of each lower side member. a second front horizontal member that extends in the vehicle width direction and connects the upper ends of the second front vertical members; and a second front horizontal member that connects the upper ends of the first front vertical member and the upper ends of the second front vertical member on each left and right side. and an upper side member connecting the upper side member.

When such a configuration is adopted, the front cabin frame includes a lower side member, an upper side member, a first front longitudinal member, a second front longitudinal member, a first front lateral member, and a second front lateral member. Since the front cabin frame has a substantially box-shaped member, the impact load applied to the front side frame from the front can be absorbed more efficiently by the substantially box-shaped front cabin frame.

In the vehicle frame structure according to the present invention, a tube-shaped metal plate having a specific wall thickness set within a range of 1.5 to 1.7 mm can be used as the front side frame. .

When such a configuration is adopted, the front side frame is easily deformed because the front side frame is made of a tubular metal plate having a specific wall thickness (within a range of 1.5 to 1.7 mm). Therefore, the impact load applied to the front side frame from the front can be absorbed more efficiently.

According to the present invention, it is possible to provide a frame structure for a vehicle that can reduce the amount of intrusion of the cabin frame into the passenger space even when a collision load is applied from the front.

1 is a perspective view of a frame structure of a vehicle according to an embodiment of the present invention. 1 is a top view of a frame structure of a vehicle according to an embodiment of the present invention. 1 is a side view of a frame structure of a vehicle according to an embodiment of the present invention. 1 is a front view of a frame structure of a vehicle according to an embodiment of the present invention. 1 is a rear view of a frame structure of a vehicle according to an embodiment of the present invention. FIG. 3 is a diagram showing deformation simulation results when a frontal collision load is applied to the frame structure of the vehicle according to the embodiment of the present invention. FIG. 3 is a diagram showing deformation simulation results when a frontal collision load is applied to the frame structure of a conventional vehicle. FIG. 1 is a perspective view of a conventional vehicle frame structure. FIG. 2 is a top view of a conventional vehicle frame structure. FIG. 2 is a side view of a conventional vehicle frame structure.

Embodiments of the present invention will be described below with reference to the drawings. Note that the following embodiments are merely preferred application examples, and the scope of application of the present invention is not limited thereto.

First, the configuration of a vehicle frame structure 1 according to an embodiment of the present invention will be described using FIGS. 1 to 5.

A vehicle frame structure 1 according to the present embodiment is applied to a two-seater open sports car type vehicle, and is a front cabin frame 1 disposed in front of a passenger compartment of the vehicle.
0, a pair of left and right front side frames 20 attached to the front of the front cabin frame 10 and extending in the longitudinal direction of the vehicle, a rear cabin frame 30 disposed behind the passenger compartment, and a rear cabin frame 30 located behind the rear cabin frame 30. A pair of left and right rear side frames 40 are attached and extend in the longitudinal direction of the vehicle.

The front cabin frame 10 includes a pair of left and right lower side members 50, a pair of left and right first front vertical members 11, a pair of left and right second front vertical members 12, a first front horizontal member 13, and a second front vertical member 12. It has a front horizontal member 14, an upper side member 15, and a connecting member 60. The front cabin frame 10 is formed into a substantially rectangular parallelepiped by a lower side member 50, an upper side member 15, a first front longitudinal member 11, a second front longitudinal member 12, a first front lateral member 13, and a second front lateral member 14. It is shaped like a box.

The lower side member 50 is a relatively long member that is disposed below the passenger compartment and extends in the longitudinal direction of the vehicle, and also constitutes a part of the rear cabin frame 30 as described later. The length of the lower side member 50 is set as appropriate depending on the length of the vehicle (for example, 1400~
(approximately 1500 mm). Lower side member 50 in this embodiment
This is constructed by forming a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section. As the metal constituting the lower side member 50, for example, iron or the like can be used.

The first front vertical member 11 is a member joined to the front end of each lower side member 50 so as to extend upward from near the front end of each lower side member 50 and substantially perpendicular to each lower side member 50. The second front vertical member 12 extends upward from a position slightly rearward than the front end of each lower side member 50 and extends substantially perpendicularly to each lower side member 50. This is a member joined to the member 50 at the relevant position. These front vertical members 11
, 12 can be set as appropriate (for example, about 650 to 700 mm) in accordance with the height of the vehicle. The front vertical members 11 and 12 both have a predetermined wall thickness (for example, 1.6 mm).
The metal plate is made into a tubular shape with a rectangular cross section. Front vertical member 1
As the metal constituting 1 and 12, for example, iron or the like can be used.

The first front horizontal member 13 is a member that extends in the vehicle width direction and connects the upper ends of the first front vertical members 11, and the second front horizontal member 14 extends in the vehicle width direction. This is a member that connects the upper ends of the second front vertical member 12 together. The lengths of these front lateral members 13 and 14 are:
It can be set as appropriate (for example, about 1400 to 1500 mm) depending on the distance between the front vertical members 11 and 12. Both of the front transverse members 13 and 14 have a predetermined wall thickness (for example, 1.6
mm) is made into a tubular shape with a rectangular cross section. As the metal constituting the front transverse members 13 and 14, for example, iron or the like can be used.

The upper side member 15 is a relatively short member that connects the upper end of the first front vertical member 11 and the upper end of the second front vertical member 12 on each of the left and right sides. The length of the upper side member 15 can be set as appropriate (for example, about 250 to 300 mm) depending on the length of the vehicle. The upper side member 15 is made of a metal plate having a predetermined thickness (for example, 1.6 mm).
It is constructed in a tubular shape with a rectangular cross section. As the metal constituting the upper side member 15, for example, iron or the like can be used.

The connecting member 60 connects the first front vertical member 11 and the front side frame 20, and is composed of a plurality of members. Specifically, the connecting member 60 extends downward from a position near the center of the first front lateral member 13 in the length direction (vehicle width direction) at a substantially right angle to the first front lateral member 13. A pair of left and right upper vertical connection members 61 are joined to the first front horizontal member 13 so that the upper vertical connection members 61 and the first front It has a pair of left and right upper horizontal connecting members 62 that connect the vertical members 11, and as shown in FIG. The rear ends of the front side frames 20 are each rigidly joined. In addition, connection member 6
0 has an upper diagonal connecting member 63 that is joined to each upper horizontal connecting member 62 and each front side frame 20 in a diagonal manner. The upper diagonal connecting member 63 is
This is for reinforcing the joint state between the upper horizontal connecting member 62 and the front side frame 20.

Further, the connecting member 60 includes a pair of left and right lower vertical connecting members 64 joined to each upper horizontal connecting member 62 so as to extend downward from the left and right upper horizontal connecting members 62, and a pair of left and right lower vertical connecting members 64. 64 and the first front vertical member 11, and a pair of left and right lower horizontal connecting members 65 extending substantially parallel to the upper horizontal connecting member 62. One end of the lower horizontal connecting member 65 is joined to the first front vertical member 11 as shown in FIG. It is located slightly above the joint position). Therefore, the impact load applied to the front side frame 20 from the front is transmitted via the upper horizontal connecting member 62, the lower vertical connecting member 64, and the lower horizontal connecting member 65 to the lower end (lower The signal is transmitted not to the joint position with the side member 50) but to a position slightly above the lower end. Further, the connecting member 60 includes a lower diagonal connecting member 66 that is joined to each lower horizontal connecting member 65 and each front side frame 20 in a diagonally extending state between the two. The lower diagonal connecting member 66 is the lower horizontal connecting member 6
5 and the front side frame 20.

Each member constituting the connecting member 60 is made of a metal plate having a predetermined wall thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section, and the length corresponds to the size of the vehicle. You can set it as appropriate. As the metal constituting the connecting member 60, for example, iron or the like can be used.

The front side frame 20 is a relatively long member that is attached to the front of the front cabin frame 10 and extends in the longitudinal direction of the vehicle. The length of the front side frame 20 can be set as appropriate (for example, about 1000 to 1050 mm) depending on the length of the vehicle. The front side frame 20 in this embodiment is a general-purpose square pipe made of a metal plate having a specific wall thickness and formed into a tubular shape with a rectangular cross section. In this embodiment, a metal plate with a wall thickness of 1.6 mm is used as the metal plate constituting the front side frame 20. As the metal forming the front side frame 20, for example, iron or the like can be used.

As shown in FIG. 3, the front side frame 20 in this embodiment is configured such that a plane P _F passing through the vertical center of the front side frame 20 is approximately parallel to a plane P _M passing through the lower end of the lower side member 50. The rear end is connected to the first front vertical member 11 via a connecting member 60 in the state where the front vertical member 11 is disposed. That is, the rear end of the front side frame 20 is connected to the substantially central portion in the vertical direction of the first front vertical member 11 (for example, the length of the first front vertical member 11 is If it is 700 mm, the first front vertical member 11
(at a position approximately 300 to 350 mm from the bottom end). Further, the rear end of the front side frame 20 includes an upper horizontal connecting member 62, a lower vertical connecting member 64, and a lower horizontal connecting member 65.
A position slightly below the substantially vertical center of the first front vertical member 11 (for example, if the length of the first front vertical member 11 is 700 mm, the first front vertical member 11 (at a position approximately 150 to 200 mm from the bottom end). In addition, the front side frame 2
0 is also connected to the first front horizontal member 13 via an upper horizontal connecting member 62 and an upper vertical connecting member 61.

The rear cabin frame 30 includes a pair of left and right lower side members 50, a pair of left and right rear vertical members 31, a rear horizontal member 32, a pair of left and right rear diagonal members 33, and a pair of left and right reinforcing members 34. ing. As already mentioned, the lower side member 50 is a relatively long member disposed below the passenger compartment and extends in the longitudinal direction of the vehicle, and also constitutes a part of the front cabin frame 10. .

The rear vertical member 31 is a member joined to the rear end of each lower side member 50 so as to extend upward from near the rear end of each lower side member 50 and substantially perpendicular to each lower side member 50. be. The length of the rear vertical member 31 is set as appropriate depending on the height of the vehicle (for example, 330~
(approximately 350 mm). The rear vertical member 31 has a predetermined wall thickness (for example, 1
．． 6 mm) into a tubular shape with a rectangular cross section. As the metal constituting the rear vertical member 31, for example, iron or the like can be used.

The rear horizontal member 32 is a member that extends in the vehicle width direction and connects the upper ends of the rear vertical members 31 to each other. The length of the rear transverse member 32 is set as appropriate depending on the width of the vehicle (for example, 1,400 to 1,400 mm).
(approximately 500mm). The rear horizontal member 32 has a predetermined wall thickness (for example, 1
．． 6 mm) into a tubular shape with a rectangular cross section. As the metal constituting the rear transverse member 32, for example, iron or the like can be used. As shown in FIGS. 1 to 3, front ends of a pair of left and right rear side frames 40 are rigidly joined near both ends of the rear surface of the rear transverse member 32 in the longitudinal direction (width direction of the vehicle).

The rear diagonal member 33 is a member that is joined to each lower side member 50 and each rear vertical member 31 in a state in which it is stretched diagonally between the two, and the joint state of the rear vertical member 31 to the lower side member 50 is It is intended to reinforce the The rear diagonal member 33 has a predetermined wall thickness (for example, 1
．． 6 mm) into a tubular shape with a rectangular cross section, and the length can be set as appropriate depending on the size of the vehicle. As the metal constituting the rear diagonal member 33, for example, iron or the like can be used.

The reinforcing member 34 is a member that is joined to the rear horizontal member 32 and each rear side frame 40 in a diagonal manner, and is connected to the rear horizontal member 32 and each rear side frame 40. It is reinforcing. Two reinforcing members 34 are employed for each rear side frame 40 so as to reinforce each rear side frame 40 from both left and right sides. The reinforcing member 34 is formed of a metal plate having a predetermined wall thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section, and the length thereof is appropriately set according to the size of the vehicle. be able to. As the metal constituting the reinforcing member 34, for example, iron or the like can be used.

The rear side frame 40 is a relatively long member that is attached to the rear of the rear cabin frame 30 and extends in the longitudinal direction of the vehicle. The length of the rear side frame 40 can be set as appropriate (for example, about 700 to 800 mm) depending on the length of the vehicle. The rear side frame 40 in this embodiment is a general-purpose square pipe made of a metal plate having a specific wall thickness and formed into a tubular shape with a rectangular cross section. In this embodiment, a metal plate with a wall thickness of 1.6 mm is used as the metal plate constituting the rear side frame 20. As the metal constituting the rear side frame 40, for example, iron or the like can be used.

As shown in FIG. 3, the rear side frame 40 in this embodiment is configured such that a plane P _R passing through the vertical center of the rear side frame 40 is approximately parallel to a plane P _M passing through the lower end of the lower side member 50. Its front end is joined to the rear transverse member 32 of the rear cabin frame 30 in the state in which it is disposed in the rear cabin frame 30 . The distance D _R from the plane P _M passing through the lower end of the lower side member 50 to the plane P R passing through the vertical center of the rear side frame 40 is the distance D _R from the plane P _M passing through the lower end of the lower side member 50 to the front side frame 40. A plane P _F passing through the vertical center of 20
It is assumed that the distance DF is approximately the same as the distance _DF . Here, "substantially the same" means that the absolute value of the difference between the distance _DR and the distance _DF is less than 50 mm. For example, when the distance D _R is 340 mm and the distance D _F is 300 mm, the absolute value of the difference between the two is 40 mm, so they are considered to be substantially the same.

Next, a deformation simulation result when an impact load is applied from the front to the frame structure 1 of the vehicle according to the present embodiment will be explained using FIG. 6 and the like.

First, as a comparison target, as shown in FIG. 7, the cabin frame when a front impact load of 240 kN is applied to each of the left and right side frames 200 while the rear cabin frame 300 of a conventional vehicle frame structure is restrained. 100 upper end position (second vertical member 1
30, the joint portion of the second horizontal member 150, and the upper side member 160), the backward movement distance of _PJ was calculated to be 107.5 mm. At this time, the length of the first front vertical member 120 is 620 mm, and the lower end of the first front vertical member 120 (=lower side member 5
The distance D _F from the lower end of 0) to the plane P _F passing through the center of the side frame 200 in the vertical direction is 2
00 mm, and the thickness of the metal plate constituting the side frame 200 was 2.3 mm. In this way, although the conventional vehicle frame structure uses a non-general-purpose square pipe made of metal plates with a wall thickness of 2.3 mm, it successfully absorbs the frontal impact load (240 kN) in the event of a 55 km/h collision. It became clear that the upper end position P _J of the cabin frame 100 could not be fully accommodated, and the upper end position P J of the cabin frame 100 would greatly intrude into the passenger space C. The hatched areas in FIG. 7 indicate areas to which an impact load exceeding the reference value was applied. In the conventional vehicle frame structure, as shown in FIG. 7, an impact load exceeding a standard value is applied over almost the entire length of the side frame 200, and the front half of the lower side member 110, the first front vertical member 120, the upper side member 160, and the second vertical member 130 are also subjected to impact loads that exceed the reference value.

On the other hand, as shown in FIG. 6, when a front impact load of 240 kN is applied to each of the left and right front side frames 20 while the rear cabin frame 30 of the frame structure 1 of the vehicle according to the present embodiment is restrained. When calculating the rearward movement distance of the upper end position of the front cabin frame 10 (junction point between the upper end of the second vertical member 12, the second horizontal member 13, and the upper side member 15) _PJ in 16. It was 3 mm. At this time, the length of the first front vertical member 11 is 690 mm, from the lower end of the first front vertical member 11 (=lower end of the lower side member 50) to the plane P _F passing through the vertical center of the front side frame 20. The distance D _F is 340
mm, and the thickness of the metal plate constituting the front side frame 10 was 1.6 mm. Note that the distance D _R from the lower end of the first front vertical member 11 (=lower end of the lower side member 50 = lower end of the rear vertical member 31) to the plane P _R passing through the vertical center of the rear side frame 40 is 380 m.
It was m. In this way, when the vehicle frame structure 1 according to the present embodiment is adopted, the wall thickness is 1
．． Using a general-purpose square pipe made of a 6mm metal plate, it is possible to efficiently absorb the frontal impact load in the event of a 55km/h collision, and the amount of intrusion of the upper end position P _J of the front cabin frame 10 into the passenger space C. It has become clear that this can be significantly suppressed. In the vehicle frame structure 1 according to the present embodiment, as shown by diagonal lines in FIG. 5
0, it can be seen that no impact load exceeding the reference value was applied to the first front vertical member 11, upper side member 15, second vertical member 12, etc.

In the frame structure 1 according to the embodiment described above, the plane P _F passing through the vertical center of the front side frame 20 is arranged so as to be substantially parallel to the plane P _M passing through the lower end of the lower side member 50. In this state, the rear end of the front side frame 20 is connected to the substantially central portion of the first front vertical member 11 in the vertical direction via the connecting member 60. Therefore, when an impact load is applied from the front to the front side frame 20, the impact load is transmitted to the approximately central portion in the vertical direction of the first front vertical member 11 of the front cabin frame 10, and By deforming the vertically substantially central portion of the front vertical member 11 rearward, the impact can be efficiently absorbed. Therefore, when an impact load is applied to the front side frame 20 from the front, the upper part of the front cabin frame 10 can be prevented from moving rearward and intruding into the passenger compartment, thereby ensuring the safety of the occupants. can be secured.

In the frame structure 1 according to the embodiment described above, the front side frame 2
Since the rear end of the first front vertical member 11 is connected via the connecting member 60 to a position lower than approximately the vertical center of the first front vertical member 11 and not joined to the lower side member 50 (it is not connected to the joint position between the first front vertical member 11 and the lower side member 50), a front impact load applied to the front side frame 20 is transmitted via the connecting member 60 to the lower part of the first front vertical member 11 rather than to the lower side member 50. Therefore, the first front vertical member 11 can be deformed to efficiently absorb the front impact load.

Further, in the frame structure 1 according to the embodiment described above, the lower side member 50
The distance D _R from the plane P _M passing through the lower end of the rear side frame 40 to the plane P _R passing through the vertical center of the rear side frame 40 is calculated from the plane P _M passing through the lower end of the lower side member 50 to the vertical center of the front side frame 20. It can be made approximately the same as the distance to the plane P _F passing through . That is, the rear side frame 40 is placed in substantially the same plane as the front side frame 20 (the front cabin frame 10
Since the side frames 20 and 40 are arranged in a straight line from the front to the rear when viewed from the side, the impact load applied from the front to the front side frame 20 is more efficiently absorbed. Can be absorbed well.

In the frame structure 1 according to the embodiment described above, the forward cabin frame 10 includes a lower side member 50, an upper side member 15, a first front vertical member 11, a second front vertical member 12, a first front horizontal member 13, a second front horizontal member 14,
Since the front cabin frame 10 has a substantially box-like shape having the above-mentioned configuration, an impact load applied to the front side frames 20 from the front can be absorbed more efficiently by the front cabin frame 10 having a substantially box-like shape.

Further, in the frame structure 1 according to the embodiment described above, a specific wall thickness (1.5 to 1.5
Since the front side frame 20 is made of a tubular metal plate having a diameter of 1.7 mm (within a range of 1.7 mm), the front side frame 20 is easily deformed. Therefore, the impact load applied to the front side frame 20 from the front can be absorbed more efficiently.

The present invention is not limited to the above-described embodiments, and any design changes made to such embodiments by those skilled in the art as appropriate are included within the scope of the present invention as long as they have the characteristics of the present invention. .
That is, each element included in the embodiment, its arrangement, material, conditions, shape, size, etc.
The examples are not limited to those shown and can be modified as appropriate. Furthermore, the elements of the embodiments described above can be combined to the extent technically possible, and combinations of these are also included within the scope of the present invention as long as they include the features of the present invention.

1... Vehicle frame structure 10... Front cabin frame 11... First front vertical member 12... Second front vertical member 13... First front lateral member 14... Second front lateral member 15... Upper side member 20... Front side frame 30... Rear cabin frame 31... Rear vertical member 32... Rear horizontal member 40... Rear side frame 50... Lower side member 60... Connecting member D _F ... Vertical direction of the front side frame from the plane passing through the lower end of the lower side member Distance to a plane passing through the center D _R ...Distance from a plane passing through the lower end of the lower side member to a plane passing through the vertical center of the rear side frame P _F ...Plane passing through the vertical center of the front side frame P _M ...A plane passing through the lower end of the lower side member P _R ...A plane passing through the vertical center of the rear side frame

Claims (5)

A frame structure of a vehicle including a front cabin frame disposed in front of a passenger compartment of the vehicle, and a pair of left and right front side frames attached to the front of the front cabin frame and extending in a front-rear direction of the vehicle,
the front cabin frame includes a pair of left and right side members extending in a vehicle fore-and-aft direction, a pair of left and right front vertical members joined to front ends of the side members so as to extend upward from near the front ends of the side members, a front horizontal member extending in the vehicle width direction and connecting upper ends of the front vertical members, and a connecting member connecting the front vertical members and the front side frames,
the front side frame is arranged so that a plane passing through its vertical center is approximately parallel to a plane passing through the lower ends of the side members, and its rear end is connected to approximately the vertical center of the front vertical member via the front connecting member. The rear end of the front side frame is connected via the connection member to a position below a substantially central portion of the front vertical member in the vertical direction and is not joined to the side member, and not connected to the joint position between the front vertical member and the side member;
The vehicle frame structure according to claim 1. A rear cabin frame arranged rearward of the passenger compartment;
A pair of left and right rear side frames attached to the rear of the rear cabin frame and extending in the front-rear direction of the vehicle,
the rear cabin frame includes the side members, a pair of left and right rear vertical members joined to rear ends of the side members so as to extend upward from near the rear ends of the side members, and a rear horizontal member extending in a vehicle width direction and connecting upper ends of the rear vertical members,
the rear side frame is disposed so that a plane passing through a vertical center portion thereof is substantially parallel to a plane passing through a lower end of the side member, and a front end of the rear side frame is joined to the rear horizontal member,
3. The vehicle frame structure according to claim 1, wherein a distance from a plane passing through the lower ends of the side members to a plane passing through the vertical center of the rear side frame is approximately the same as a distance from the plane passing through the lower ends of the side members to a plane passing through the vertical center of the front side frame. The side member is a lower side member disposed below the passenger compartment,
The front vertical member is a first front vertical member,
The front lateral member is a first front lateral member,
The front cabin frame includes a pair of left and right second front longitudinal members joined to the positions of the lower side members so as to extend upward from a position slightly rearward than the front ends of the lower side members. a second front horizontal member extending in the vehicle width direction and connecting the upper ends of the second front vertical member; and an upper side member connecting the upper end of the member.
The frame structure of the vehicle according to any one of . 5. The front side frame is constructed of a tubular metal plate having a specific wall thickness set within a range of 1.5 to 1.7 mm. vehicle frame structure.

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