Vehicle frame structure
By designing a specific vehicle frame structure, the problem of excessive retraction of the car frame during the traditional frame collision is solved, effective impact force transmission and absorption is achieved, and the safety of the occupants is improved.
Patent Information
- Application Number
- JP2020173520
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2020-10-14
- Publication Date
- 2025-04-10
- Estimated Expiration
- 2040-10-14
AI Technical Summary
In two-seat open sports car type vehicles, when the traditional frame structure is loaded in front, the car frame is excessively retracted, causing the car frame to enter the occupant space, affecting safety.
A vehicle frame structure is designed, in which the front car frame and the front side frame are connected through a specific connection method to ensure that when the forward collision is loaded, the impact force can be effectively transmitted to the center of the car frame, and through the frame design and material selection, the frame can effectively absorb and disperse the impact force during collision.
It effectively reduces the degree to which the car frame enters the occupant space when a forward collision is collided, improves the safety of the occupants, and improves the absorption capacity of the frame in collision by optimizing the design and material selection of the frame.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present invention relates to a frame structure of a vehicle. [Background technology]
[0002] Various improvements to the vehicle frame structure have been proposed and put to practical use. For example, a vehicle frame structure with high rigidity and strength against a frontal collision load has been proposed (see Patent Document 1). According to this technology, it is said that by connecting the rocker, floor frame, under-floor cross member, and rear side member to each other at the same locations, the connecting force of the so-called frame members, the floor frame, rocker, under-floor cross member, and rear side member, can be increased, and the strength and rigidity of these members can be improved. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2018-52499 A Summary of the Invention [Problem to be solved by the invention]
[0004] In recent years, the development of frame structures for two-seater open sports car type vehicles has been progressing. A conventional frame structure for such vehicles includes a cabin frame 100 disposed in front of the passenger compartment of the vehicle, and a pair of left and right side frames 200 attached to the front of the cabin frame 100 and extending in the front-rear direction of the vehicle, as shown in Figs. 8 to 10, for example. The cabin frame 100 comprises a pair of left and right lower side members 110 extending in the fore-and-aft direction of the vehicle, a pair of left and right first vertical members 120 extending upward from near the front ends of each lower side member 110, a pair of left and right second vertical members 130 extending upward from a position slightly rearward of the front ends of each lower side member 110, a first transverse member 140 extending in the vehicle width direction and connecting the upper ends of the first vertical members 120, a second transverse member 150 extending in the vehicle width direction and connecting the upper ends of the second vertical members 130, and upper side members 160 connecting the upper ends of the first vertical members 120 and the upper ends of the second vertical members 130 on each of the left and right sides, and is formed into a substantially rectangular box shape by these members.
[0005] 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, as shown in FIG. 7, the upper end position of the cabin frame 100 (near the joint position between the upper end of the second vertical member 130, the second horizontal member 150, and the upper side member 160) P J This causes a problem that the cabin frame 100 is significantly pushed back, causing a part of the cabin frame 100 to intrude into the interior space (passenger space) C of the passenger compartment of the vehicle. For this reason, there has been a need for a frame structure that can reduce the amount of intrusion of the cabin frame 100 into the passenger space C even when a collision load is applied from the front in a two-seater open sports car type vehicle.
[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a vehicle frame structure that can reduce the amount of intrusion of the cabin frame into the occupant space even when a collision load is applied from the front. [Means for solving the problem]
[0007] In order to achieve the above-mentioned object, the frame structure of a vehicle according to the present invention comprises a front cabin frame arranged in front of the vehicle passenger compartment, and a pair of left and right front side frames attached to the front of the front cabin frame and extending in the fore-and-aft direction of the vehicle, the front cabin frame having a pair of left and right side members extending in the fore-and-aft direction of the vehicle, a pair of left and right front vertical members joined to the front ends of each side member so as to extend upward from near the front ends of each side member, a front transverse 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 members and the front side frames, the front side frames being arranged so that a plane passing through their up-down center is approximately parallel to a plane passing through the lower ends of the side members, and the rear ends of the front side frames are connected to approximately the up-down center of the front vertical members via the front connecting member.
[0008] When this configuration is adopted, the rear end of the front side frame is connected to approximately the vertical center of the front vertical member via the connecting member in a state in which a plane passing through the vertical center of the front side frame is arranged to be approximately parallel to a plane passing through the lower end of the side 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 approximately vertical center of the front vertical member is deformed rearward to efficiently absorb the impact. Therefore, when an impact load is applied from the front to the front side frame, it is possible to prevent the upper part of the front cabin frame from bending rearward and entering the occupant space, and to ensure the safety of the occupants.
[0009] In the vehicle frame structure of the present invention, the rear end of the front side frame can be connected via a connecting member to a position lower than approximately the vertical center of the front vertical member and not joined to the side member (not connected to the joint position between the front vertical member and the side member).
[0010] When this configuration is adopted, the rear end of the front side frame is connected via the connecting member to a position lower than the approximate vertical center of the front vertical member and not joined to the side member (it is not connected to the joint position between the front vertical member and the side member), so that a front impact load applied to the front side frame is transmitted via the connecting member to the lower part of the front vertical member rather than to the side member. Therefore, the front vertical member can be deformed to efficiently absorb the front impact load.
[0011] The frame structure for a vehicle according to the present invention may further include 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 front-rear direction of the vehicle, and the rear cabin frame may include side members, a pair of left and right rear vertical members joined to the rear ends of the side members so as to extend upward from the vicinity of the rear ends of the side members, and a rear horizontal member extending in the vehicle width direction and connecting the upper ends of the rear vertical members. In this case, the front ends of the rear side frames may be joined to the rear horizontal members in a state in which the rear side frames are arranged such that a plane passing through the vertical center portions of the rear side frames is substantially parallel to a plane passing through the lower ends of the side members. In addition, the distance from the plane passing through the lower ends of the side members to the plane passing through the vertical center portions of the rear side frames may be substantially the same as the distance from the plane passing through the lower ends of the side members to the plane passing through the vertical center portions of the front side frames.
[0012] When this configuration is adopted, the distance from the plane passing through the lower ends of the side members to the plane passing through the vertical center of the rear side frame can be made substantially the same as the distance from the plane passing through the lower ends of the side members to the plane passing through the vertical center of the front side frame. In other words, since the rear side frame is disposed in substantially the same plane as the front side frame (substantially at the vertical center of the front cabin frame) and the side frames are disposed linearly from the front to the rear in a side view, impact loads applied to the front side frame from the front can be absorbed more efficiently.
[0013] In the frame structure of the vehicle according to the present invention, the side members already described may be lower side members arranged below the passenger compartment, the front vertical members already described may be first front vertical members, and the front transverse members already described may be first front transverse members. In such a case, the front cabin frame may have a pair of left and right second front vertical members joined to each lower side member at a position slightly rearward of the front ends of the lower side members so as to extend upward from the corresponding positions, a second front transverse member extending in the vehicle width direction and connecting the upper ends of the second front vertical members, and upper side members on each of the left and right sides connecting the upper ends of the first front vertical members and the upper ends of the second front vertical members.
[0014] When such a configuration is adopted, the forward cabin frame has a generally box-like shape having a lower side member, an upper side member, a first front vertical member, a second front vertical member, a first front horizontal member, and a second front horizontal member, so that impact loads applied from the front to the front side frames can be absorbed more efficiently by the forward cabin frame having a generally box-like shape.
[0015] In the vehicle frame structure according to the present invention, a tubular metal plate having a specific thickness set within a range of 1.5 to 1.7 mm can be used as the front side frame.
[0016] With this configuration, the front side frame is easily deformed because the front side frame is made of a tubular metal plate having a specific thickness (within the range of 1.5 to 1.7 mm), and therefore can more efficiently absorb impact loads applied from the front to the front side frame. Effect of the Invention
[0017] 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. [Brief description of the drawings]
[0018] [Figure 1] 1 is a perspective view of a frame structure of a vehicle according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a top view of the frame structure of the vehicle according to the embodiment of the present invention. [Diagram 3] 1 is a side view of a frame structure of a vehicle according to an embodiment of the present invention. [Figure 4] 1 is a front view of a frame structure of a vehicle according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a rear view of the frame structure of the vehicle according to the embodiment of the present invention. [Figure 6] 11A and 11B are diagrams showing the results of a deformation simulation in the case where a front collision load acts on the frame structure of the vehicle according to the embodiment of the present invention. [Figure 7] 11A and 11B are diagrams showing the results of a deformation simulation performed when a front collision load acts on a frame structure of a conventional vehicle. [Figure 8] FIG. 1 is a perspective view of a frame structure of a conventional vehicle. [Figure 9] FIG. 1 is a top view of a conventional vehicle frame structure. [Figure 10] FIG. 1 is a side view of a conventional vehicle frame structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0019] Hereinafter, embodiments of the present invention will be described 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 to these.
[0020] First, the configuration of a vehicle frame structure 1 according to an embodiment of the present invention will be described with reference to Figs. 1 to 5.
[0021] The vehicle frame structure 1 of this embodiment is applied to a two-seater open sports car type vehicle, and comprises a front cabin frame 10 arranged in front of the vehicle's passenger compartment, a pair of left and right front side frames 20 attached to the front of the front cabin frame 10 and extending in the fore-and-aft direction of the vehicle, a rear cabin frame 30 arranged behind the passenger compartment, and a pair of left and right rear side frames 40 attached to the rear of the rear cabin frame 30 and extending in the fore-and-aft direction of the vehicle.
[0022] The forward cabin frame 10 has 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, a second front horizontal member 14, an upper side member 15, and a connecting member 60. The forward cabin frame 10 is formed into a substantially rectangular parallelepiped box shape by the lower side members 50, the upper side members 15, the first front vertical members 11, the second front vertical members 12, the first front horizontal members 13, and the second front horizontal members 14.
[0023] The lower side member 50 is a relatively long member disposed below the passenger compartment and extending in the front-rear 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 can be set appropriately (for example, about 1400 to 1500 mm) according to the length of the vehicle. The lower side member 50 in this embodiment is formed by shaping a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section. The metal constituting the lower side member 50 can be, for example, iron or the like.
[0024] 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 the vicinity of the front end of each lower side member 50 at a substantially right angle to each lower side member 50, and the second front vertical member 12 is a member joined to each lower side member 50 at a position slightly rearward of the front end of each lower side member 50 so as to extend upward at a substantially right angle to each lower side member 50. The length of these front vertical members 11, 12 can be appropriately set (for example, about 650 to 700 mm) according to the height of the vehicle. Both of the front vertical members 11, 12 are formed by forming a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape having a rectangular cross section. For example, iron or the like can be used as the metal constituting the front vertical members 11, 12.
[0025] The first front horizontal member 13 is a member extending in the vehicle width direction and connecting the upper ends of the first front vertical members 11, and the second front horizontal member 14 is a member extending in the vehicle width direction and connecting the upper ends of the second front vertical members 12. The length of these front horizontal members 13, 14 can be set appropriately (for example, about 1400 to 1500 mm) according to the distance between the front vertical members 11 and 12. Both of the front horizontal members 13, 14 are formed by shaping a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section. The metal constituting the front horizontal members 13, 14 can be, for example, iron or the like.
[0026] The upper side members 15 are relatively short members that connect the upper ends of the first front vertical members 11 and the second front vertical members 12 on the left and right sides, respectively. The length of the upper side members 15 can be set appropriately (for example, about 250 to 300 mm) according to the length of the vehicle. The upper side members 15 are formed by shaping a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section. The metal that constitutes the upper side members 15 can be, for example, iron.
[0027] 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 has a pair of left and right upper vertical connecting members 61 joined to the first front horizontal member 13 so as to extend downward from a position near the center of the first front horizontal member 13 in the longitudinal direction (width direction of the vehicle) at a substantially right angle to the first front horizontal member 13, and a pair of left and right upper horizontal connecting members 62 extending substantially parallel to the first front horizontal member 13 to connect the upper vertical connecting members 61 and the first front vertical member 11. As shown in FIG. 1, the rear ends of the left and right front side frames 20 are rigidly joined to the front faces of the left and right upper horizontal connecting members 62 at substantially the center in the longitudinal direction. The connecting member 60 also has upper diagonal connecting members 63 joined to each of the upper horizontal connecting members 62 and each of the front side frames 20 in a state of being diagonally stretched between them. The upper diagonal connecting member 63 is intended to reinforce the joint between the upper horizontal connecting member 62 and the front side frame 20.
[0028] The connecting member 60 has a pair of left and right lower vertical connecting members 64 joined to the left and right upper horizontal connecting members 62 so as to extend downward from each of the left and right upper horizontal connecting members 62, and a pair of left and right lower horizontal connecting members 65 joined to both the left and right lower vertical connecting members 64 and the first front vertical member 11 and extending approximately 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. 1, but the joining position is located slightly above the lower end of the first front vertical member 11 (joining position with the lower side member 50). For this reason, an 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 a position slightly above the lower end, rather than to the lower end of the first front vertical member 11 (joining position with the lower side member 50). The connecting member 60 also has lower diagonal connecting members 66 that are joined to each of the lower horizontal connecting members 65 and each of the front side frames 20 in a state of being diagonally suspended between them. The lower diagonal connecting members 66 are intended to reinforce the connection between the lower horizontal connecting members 65 and the front side frames 20.
[0029] Each member constituting the connecting member 60 is made of a metal plate having a predetermined thickness (e.g., 1.6 mm) shaped into a tube having a rectangular cross section, and the length can be set appropriately according to the size of the vehicle. The metal constituting the connecting member 60 can be, for example, iron.
[0030] The front side frame 20 is a relatively long member attached to the front of the front cabin frame 10 and extending in the front-rear direction of the vehicle. The length of the front side frame 20 can be set appropriately (for example, about 1000 to 1050 mm) according to the length of the vehicle. The front side frame 20 in this embodiment is a general-purpose square pipe formed by shaping a metal plate having a specific thickness into a tubular shape with a rectangular cross section. In this embodiment, a metal plate having a thickness of 1.6 mm is used as the metal plate constituting the front side frame 20. For example, iron or the like can be used as the metal constituting the front side frame 20.
[0031] As shown in FIG. 3, the front side frame 20 in this embodiment is aligned along a plane P F The plane P passing through the lower end of the lower side member 50 MThe front side frame 20 is disposed so as to be substantially parallel to the first front vertical member 11, and its rear end is connected to the first front vertical member 11 via the connecting member 60. That is, the rear end of the front side frame 20 is connected to the substantially vertical center of the first front vertical member 11 (for example, when the length of the first front vertical member 11 is 700 mm, the position is about 300 to 350 mm from the lower end of the first front vertical member 11) via the upper horizontal connecting member 62 of the connecting member 60. The rear end of the front side frame 20 is connected to a position slightly lower than the substantially vertical center of the first front vertical member 11 (for example, when the length of the first front vertical member 11 is 700 mm, the position is about 150 to 200 mm from the lower end of the first front vertical member 11) via the upper horizontal connecting member 62, the lower vertical connecting member 64, and the lower horizontal connecting member 65. The rear end of the front side frame 20 is also connected to the first front horizontal member 13 via the upper horizontal connecting member 62 and the upper vertical connecting member 61.
[0032] The rear cabin frame 30 has 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. As already described, the lower side members 50 are relatively long members that are disposed below the passenger compartment and extend in the fore-and-aft direction of the vehicle, and also constitute a part of the front cabin frame 10.
[0033] 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 at a substantially right angle to each lower side member 50. The length of the rear vertical member 31 can be set appropriately (for example, about 330 to 350 mm) according to the height of the vehicle. The rear vertical member 31 is formed by forming a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section. The metal constituting the rear vertical member 31 can be, for example, iron or the like.
[0034] The rear cross member 32 is a member that extends in the vehicle width direction and connects the upper ends of the rear vertical members 31 together. The length of the rear cross member 32 can be set appropriately (for example, about 1400 to 1500 mm) according to the width of the vehicle. The rear cross member 32 is formed by forming a metal plate having a predetermined thickness (for example, 1.6 mm) into a tubular shape with a rectangular cross section. For example, iron can be used as a metal for forming the rear cross member 32. As shown in Figs. 1 to 3, the front ends of a pair of left and right rear side frames 40 are rigidly joined to the rear surface of the rear cross member 32 near both ends in the longitudinal direction (vehicle width direction).
[0035] The rear diagonal members 33 are members that are joined to each of the lower side members 50 and each of the rear vertical members 31 in a state of being diagonally stretched between them, and serve to reinforce the joining state of the rear vertical members 31 to the lower side members 50. The rear diagonal members 33 are formed from a metal plate having a predetermined thickness (e.g., 1.6 mm) into a tubular shape with a rectangular cross section, and the length of the rear diagonal members 33 can be appropriately set according to the size of the vehicle. The metal that constitutes the rear diagonal members 33 can be, for example, iron.
[0036] The reinforcing member 34 is a member joined to the rear cross member 32 and each rear side frame 40 in a state of being diagonally stretched between them, and serves to reinforce the joining state of each rear side frame 40 to the rear cross member 32. Two reinforcing members 34 are employed for each rear side frame 40 so as to reinforce each rear side frame 40 from both the left and right. The reinforcing member 34 is formed from a metal plate having a predetermined thickness (e.g., 1.6 mm) into a tubular shape with a rectangular cross section, and its length can be appropriately set according to the size of the vehicle. The metal constituting the reinforcing member 34 can be, for example, iron or the like.
[0037] The rear side frame 40 is a relatively long member attached to the rear of the rear cabin frame 30 and extending in the front-rear direction of the vehicle. The length of the rear side frame 40 can be set appropriately (for example, about 700 to 800 mm) according to the length of the vehicle. The rear side frame 40 in this embodiment is a general-purpose square pipe formed by shaping a metal plate having a specific thickness into a tubular shape with a rectangular cross section. In this embodiment, a metal plate having a thickness of 1.6 mm is used as the metal plate constituting the rear side frame 20. For example, iron or the like can be used as the metal constituting the rear side frame 40.
[0038] As shown in FIG. 3, the rear side frame 40 in this embodiment is aligned with a plane P R The plane P passing through the lower end of the lower side member 50 M The front end of the lower side member 50 is joined to the rear cross member 32 of the rear cabin frame 30 in a state in which the front end of the lower side member 50 is disposed so as to be substantially parallel to the rear cross member 32 of the rear cabin frame 30. M A plane P passing through the vertical center of the rear side frame 40 R Distance to R is a plane P passing through the lower end of the lower side member 50. M A plane P passing through the vertical center of the front side frame 20 F Distance to F Here, the term "almost the same" means that the distance D R and distance D F This means that the absolute value of the difference between the distance D and the distance D is less than 50 mm. 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 the two are considered to be approximately the same.
[0039] Next, a deformation simulation result when an impact load acts from the front on the vehicle frame structure 1 according to this embodiment will be described with reference to FIG. 6 etc.
[0040] First, as a comparison example, as shown in FIG. 7, in a state where the rear cabin frame 300 of a conventional vehicle frame structure is restrained and a front impact load of 240 kN is applied to each of the left and right side frames 200, the upper end position P of the cabin frame 100 (the joint between the upper end of the second vertical member 130, the second horizontal member 150, and the upper side member 160) J The distance of the rearward movement of the first front vertical member 120 was calculated to be 107.5 mm. At this time, the length of the first front vertical member 120 was 620 mm, and the plane P F Distance to F The height of the side frame 200 was 200 mm, and the thickness of the metal plate constituting the side frame 200 was 2.3 mm. Thus, in the conventional vehicle frame structure, a non-general purpose square pipe made of a metal plate with a thickness of 2.3 mm was used, but it was unable to fully absorb the front impact load (240 kN) during a 55 km / h collision, and the upper end position P J It became clear that the impact load significantly intruded into the occupant space C. In Fig. 7, the hatched areas indicate areas where an impact load exceeding the reference value was applied. In the frame structure of the conventional vehicle, as shown in Fig. 7, an impact load exceeding the reference value was applied over almost the entire length of the side frame 200, and further, it can be seen that an impact load exceeding the reference value was also applied to 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.
[0041] In contrast, 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 in a state in which the rear cabin frame 30 of the vehicle frame structure 1 according to this embodiment is restrained, the upper end position P of the front cabin frame 10 (the joint between the upper end of the second vertical member 12, the second horizontal member 13, and the upper side member 15) JThe distance of the rearward movement of the first front vertical member 11 was calculated to be 16.3 mm. At this time, the length of the first front vertical member 11 was 690 mm, and the plane P F Distance to F The distance between the first front vertical member 11 and the rear vertical member 31 is 340 mm, and the thickness of the metal plate constituting the front side frame 10 is 1.6 mm. R Distance to R In this way, when the vehicle frame structure 1 according to this embodiment is adopted, the front impact load during a 55 km / h collision can be efficiently absorbed using a general-purpose square pipe made of a metal plate with a wall thickness of 1.6 mm, and the upper end position P J It has become clear that this can significantly reduce the amount of intrusion of the vehicle body into the occupant space C. In the vehicle frame structure 1 according to this embodiment, as indicated by the diagonal lines in Fig. 6, it can be seen that an impact load exceeding the reference value is applied only to a portion of the side frame 200 (and its surrounding members), and an impact load exceeding the reference value is not applied to the lower side member 50, the first front vertical member 11, the upper side member 15, the second vertical member 12, etc.
[0042] In the frame structure 1 according to the embodiment described above, a plane P F The plane P passing through the lower end of the lower side member 50 MThe rear ends of the front side frames 20 are connected to approximately the vertical center of the first front vertical member 11 via the connecting members 60 in a state in which the front side frames 20 are disposed so as to be approximately parallel to the first front vertical member 11. Therefore, when an impact load is applied to the front side frames 20 from the front, the impact load is transmitted to approximately the vertical center of the first front vertical member 11 of the front cabin frame 10, and the approximately vertical center of the first front vertical member 11 is deformed rearward to efficiently absorb the impact. Therefore, when an impact load is applied to the front side frames 20 from the front, it is possible to prevent the upper part of the front cabin frame 10 from moving rearward and intruding into the passenger compartment, thereby ensuring the safety of the passengers.
[0043] Moreover, in the frame structure 1 according to the embodiment described above, the rear end of the front side frame 20 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), so that 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.
[0044] In the frame structure 1 according to the embodiment described above, a plane P M A plane P passing through the vertical center of the rear side frame 40 R Distance to R The plane P passing through the lower end of the lower side member 50 M A plane P passing through the vertical center of the front side frame 20 FIn other words, the rear side frame 40 is disposed in approximately the same plane as the front side frame 20 (approximately at the center position in the up-down direction of the front cabin frame 10), and the side frames 20, 40 are disposed linearly from the front to the rear in a side view, so that the front side frame 20 can more efficiently absorb an impact load applied from the front.
[0045] Furthermore, in the frame structure 1 according to the embodiment described above, the forward cabin frame 10 has a generally box-like shape having the lower side member 50, the upper side member 15, the first front vertical member 11, the second front vertical member 12, the first front horizontal member 13, and the second front horizontal member 14. Therefore, the impact load applied from the front to the front side frame 20 can be absorbed more efficiently by the forward cabin frame 10 having a generally box-like shape.
[0046] In the frame structure 1 according to the embodiment described above, the front side frame 20 is made of a tubular metal plate having a specific thickness (within the range of 1.5 to 1.7 mm), which makes the front side frame 20 more easily deformable. Therefore, the front side frame 20 can absorb impact loads applied from the front more efficiently.
[0047] The present invention is not limited to the above-mentioned embodiments, and even if a person skilled in the art appropriately modifies the design of the embodiments, the embodiment is included in the scope of the present invention as long as it has the characteristics of the present invention. In other words, the elements of the above-mentioned embodiments and their arrangement, materials, conditions, shapes, sizes, etc. are not limited to those exemplified, and can be appropriately modified. In addition, the elements of the above-mentioned embodiments can be combined to the extent technically possible, and the combination of these elements is also included in the scope of the present invention as long as it has the characteristics of the present invention. [Explanation of symbols]
[0048] 1. Vehicle frame structure 10…Forward cabin frame 11...First front vertical member 12...Second front vertical member 13…First front horizontal member 14…Second front horizontal member 15…Upper side member 20…Front side frame 30…Aft cabin frame 31...Rear vertical member 32…Rear horizontal member 40…Rear side frame 50…Lower side member 60…Connected member D F ...The distance from the plane passing through the bottom end of the lower side member to the plane passing through the vertical center of the front side frame D R ...The distance from the plane passing through the bottom end of the lower side member to the 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 ...Plane passing through the bottom end of the lower side member P R ...Plane passing through the vertical center of the rear side frame
Claims
1. 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, a vehicle frame structure in which 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 end of the side member, and the rear end of the front side frame is connected to approximately the vertical center of the front vertical member via the connecting member.
2. 2. The frame structure of a vehicle according to claim 1, wherein a rear end of the front side frame is connected via the connecting member at a position lower than approximately the center in the up-down direction of the front vertical member and not joined to the side member, and is not connected to a joint position between the front vertical member and the side member.
3. 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 such 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.
4. The side member is a lower side member disposed below the passenger compartment, the front longitudinal member is a first front longitudinal member, the front cross member is a first front cross member, 4. The frame structure of a vehicle according to claim 1, wherein the front cabin frame comprises a pair of left and right second front vertical members joined to the positions of each of the lower side members so as to extend upward from a position slightly rearward of the front ends of the lower side members, a second front transverse member extending in the vehicle width direction and connecting upper ends of the second front vertical members, and upper side members on each of the left and right sides connecting upper ends of the first front vertical members and upper ends of the second front vertical members.
5. The vehicle frame structure according to any one of claims 1 to 4, wherein the front side frame is formed by shaping a metal plate having a specific thickness set within a range of 1.5 to 1.7 mm into a tubular shape.
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