JPH05338559A - Connecting structure for lower member of body - Google Patents

Abstract

PURPOSE:To provide a structure by which input load to a side member at collision can be efficiently transmitted to a side sill through matching of fit receiving faces and fit pressing faces, so as to improve energy absorbing charac teristic at collision. CONSTITUTION:A front side member 25 is provided with fit abutting faces 61X, 61Z, 63X, 63Z, 65X, 65Z to be joined to a side sill 27 in the right and left direction and the up and down direction of the closed sectional part 59. Meanwhile, the side sill 27 is provided with fit receiving faces 81X, 81Z, 83X, 83Z, 85X, 85Z respectively in response to these fit abutting faces 61X, 61Z, 63X, 63Z, 65X, 65Z. The stress to the front side member 25 at collision of the front of a vehicle is stably and efficiently transmitted from the front member 25 to the side sill 27 while restraining partial deformation through matching of the fit receiving faces and the fit abutting faces. Hereby, energy absorbing characteristic at collision is improved and rigidity of the whole body is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for a vehicle body lower member, and more particularly to a connecting structure for a front side member and a side sill.

[0002]

2. Description of the Related Art Conventionally, there is a front body structure of a vehicle shown in FIGS. 23 to 25, which is described in, for example, Japanese Utility Model Laid-Open No. 3-71979.

As shown in FIG. 23, this front vehicle body structure has a front upper frame 1, a front side frame 3, and a front cross member 5, which are made of light alloy square pipe material.
7, a front frame pillar 9 and the like, and a dash panel 11 is attached to the rear end portion.

The front side frame 3 is a side member of the vehicle body structure and is formed by extrusion molding. As shown in FIGS. 24 and 25, the front side frame 3 is divided by the connecting portion 13 and is continuous in parallel with each other. The rear part of the linear member having the closed cross-section part 15 and the second connected closed cross-section part 17 is separated into a first separated closed cross-section part 19 and a second separated closed cross-section part 21, and a first separated closed cross-section part. 19 is bent upward, and the second separated closed cross section 21 is bent downward to form a bifurcated shape.

As shown in FIG. 23, the front side frame 3 formed in this manner has a front end surface side which is divided into a front cross member 7 and a front frame pillar 9, and first and second separated parts which are vertically separated. Closed cross section 19,2
Each rear end surface of the No. 1 is joined to the vertical surface and the inclined surface of the dash panel 11 by abutting.

In this way, the rear end side of the front side frame 3 is formed into a bifurcated shape by the first and second separated closed cross section portions 19 and 21 which are integrally connected to the first and second connected closed cross section portions 15 and 17. As a result, a more rigid frame strength is obtained, the number of parts is reduced, and the number of welding points is reduced.

[0007]

However, in the front body structure as described above, since the rear end surface of the front side frame 3 is only joined to the dash panel 11 by abutting, a frontal collision occurs. When an axial compressive load in the front-rear direction of the vehicle body is input to the front side frame 3 and the first and second separated closed cross-section portions 19 and 21 are bent and deformed, the load is transmitted to the rear frame member, for example, the side sill. May not be stable.

Therefore, an object of the present invention is to provide a connecting structure for a lower body member of a vehicle body capable of stably transmitting a load from a side member to a side sill in the event of a collision.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the invention of claim 1 is a vehicle body lower member for connecting a side member and a side sill of a vehicle body lower portion extending in a closed cross-section structure of a constant cross section. In the joint structure of (1), at least a pair of fitting receiving surfaces is provided at the end of the side sill in the left-right direction and the up-down direction of the vehicle body, and at least one pair of fitting receiving surfaces is provided at the end of the side member in the left-right direction and the up-down direction of the vehicle body. Is provided, and the end portions of the side members are coupled to the end portions of the side sills so that the fitting receiving surfaces abut against the fitting receiving surfaces.

The invention according to claim 2 is the joint structure for a vehicle body lower member according to claim 1, wherein a notch is formed at an end of the side sill, and an abutting surface for abutting an end face of the side member is provided. It is characterized by being provided.

[0011]

According to the invention described in claim 1, when a collision occurs,
When a vertical or horizontal bending load is applied to the side member, the fitting contact surface contacts the fitting receiving surface, and the load can be efficiently transmitted from the side member to the side lug.

According to the second aspect of the present invention, the load in the front-rear direction input to the side member can also be efficiently transmitted by the end face of the side member hitting the collision surface.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a connecting structure of a vehicle body lower member according to an embodiment of the present invention, and FIG. 2 is a sectional view of the front side member 25 taken along the line II--II in FIG.

FIG. 3 shows the overall structure of a vehicle body frame using the connecting structure of the vehicle body lower member according to this embodiment. The vehicle body frame is composed of a frame material made of a light alloy extruded material such as an aluminum alloy. There is. That is, the front upper member 2 made of a light alloy square pipe
3 and Froton side member 25, side sill 27, rear upper member 29, rear side member 31, strut housing 33, hinge pillar 35, front pillar 37, center pillar 39, front roof rail 41, rear roof rail 43, and side roof rail 4.
It is composed of 5 and the like.

As a side member, the front side member 25 according to this embodiment is, as shown in FIGS. 3 and 4,
A first bent portion 47 in the middle of the vehicle body front-rear direction is formed to be bent outward in the vehicle width direction and a vehicle body downward direction, and an end portion thereof is formed to be bent rearward in the vehicle body front-rear direction by a second bent portion 49.
Then, the dash cross member 4 is attached to the first bent portion 47.
8 are connected.

As shown in FIGS. 1 and 2, the front side member 25 has upper and lower wall portions 51, 5 having a predetermined wall thickness.
3 and the left and right wall portions 55 and 57 form a hollow prismatic closed cross-section portion 5
9 is a closed cross section structure in which the fitting section 6 is joined to the side sill 27 in the left and right and up and down directions of the closed cross section 59.
1, 63, 65 are formed. These fitting parts 61,
63 and 65 are vertical and horizontal fitting surfaces 61, respectively.
X, 61Z, 63X, 63Z, 65X, 65Z.

On the other hand, as shown in FIG. 1, the side sill 27 is formed in a closed cross-section structure by upper and lower wall portions 67 and 69 having a predetermined meat character, an inner wall portion 71 and an outer wall portion 73. At the front end of the side sill 27, a cutout portion 75 is formed by cutting out a part of the left wall portion 71 and the lower wall portion 69 to allow the front side member 25 to be engaged.
In the cutout portion 75, abutting surfaces 77, 79 for abutting the lower wall portion 53 of the front side member 25 and the rear end portions 53a, 55a of the left wall portion 55, and an engaging portion for engaging the fitting portion 61. An engaging portion 83 that engages the 81 and the fitting portion 65 is formed. Further, the upper wall portion 67 of the side sill 27 is formed with a projecting piece 85 projecting into the closed cross section, and the projecting piece 85 is formed with an engaging portion 87 for engaging the fitting portion 63 of the front side member 25. Has been done.

The engaging portions 81, 83, 87 are the fitting surfaces 61X, 61Z, 63 of the fitting portions 61, 63, 65, respectively.
Fitting receiving surface 81 corresponding to X, 63Z, 65X, 65Z
It has X, 81Z, 83X, 83Z, 87X, 87z.

The connection between the rear end of the front side member 25 and the front end of the side sill 27 thus formed is
The front side member 25 is inserted into the cutout portion 75 of the side sill 27, and the lower wall portion 5 of the front side member 25 is inserted.
3 and the rear end surfaces 53a and 55a of the left wall portion 55 are abutted against the lower wall portion 69 of the side sill 27 and the abutting surfaces 77 and 79 of the left wall portion 71, and the fitting portions 61 and 6 of the front side member 25 are engaged.
3, 65 are engaged with the engaging portions 81, 87, 83 of the side sill 27, respectively, and are joined to each other with an adhesive or the like. The fitting portion 61 and the engaging portion 81 can be joined by spot welding or the like.

Since the side sill 27 and the front side member 25 are both formed by extrusion, the fitting portions 61, 63, 65, the engaging portions 81, 83, 87 and the like can be easily formed.

Next, the load action of the above embodiment will be described with reference to FIGS.

FIG. 4 to FIG. 6 are explanatory views showing the operating state when seen in a plane of the vehicle body.

When an impact load F is input to the front side member 25 due to a frontal collision of the vehicle body or the like, the input load F
Is the first of the front side members 25 as shown in FIG.
Although the bent portion 47 is a component force in the axial direction of compression load F _L of the force F _T and the front side member 25 to defeat the front side member 25 to the vehicle body in the direction, force defeat the front side member 25 to the vehicle body in the direction F _T Is a dash cross member 48
Suppressed by.

Further, the axial compression load F _L of the front side member 25 is a force F _X that tilts the front end of the side sill 27 outward of the vehicle body at the joint with the side sill 27 and a rear axial force F _Y of the side sill 27. Is divided into. The force F _X that tilts the front end of the side sill 27 toward the outside of the vehicle body is such that the front of the connecting portion of the front side member 25 with the side sill 27 is the outside of the vehicle and the rear is the inside of the vehicle with the front end of the side sill 27 as the fulcrum. Although the bending moment is generated, according to the coupling structure of this embodiment, at the front end of the side sill 27, as shown in FIG. The mating surfaces 63X and 65X of the 63 and 65 are the engaging portions 87 of the side sill 27.
The force is transmitted to the projecting piece 85 and the lower wall portions 69, 83 via the rear side, and at the rear, as shown in FIG. 6, the fitting portion 61 of the left wall portion 55 (vehicle body inner side wall portion) of the front side member 25. The mating surface 61X of the engaging portion 81 of the side sill 27 is
The force is transmitted to the inner wall portion 71 via. Further, the axial force F _Y is determined by the lower wall portion 53 and the left wall portion 55 of the front side member 25.
Is transmitted to the lower wall portion 69 and the inner wall portion 71 of the side sill 27 in the axial direction.

FIG. 7 to FIG. 9 are explanatory views showing the operating state as seen from the side surface of the vehicle body.

Input load F to the front side member 25
When viewed from the side of the vehicle body, as shown in FIG. 7, a force F _T ′ for bending the front side member 25 upward in the vehicle body at the first bent portion 47 of the front side member 25 and a load in the axial compression direction of the front side member 25. Although the force is divided by F _L , the force F _T ′ that bends the front side member 25 in the upward direction of the vehicle body
Are suppressed by the strut housing 33 and the like.

Further, the axial compression load F _L of the front side member 25 is a force F _Z that tilts the front end of the side sill 27 downward in the vehicle body at the joint with the side sill 27 and a rearward axial force F _Y of the side sill 27. Is divided into. The force F _Z that tilts the front end of the side sill 27 downward in the vehicle body is such that the front of the connecting portion of the front side member 25 with the side sill 27 is the vehicle downward direction and the rear is the vehicle upward direction with the front end of the side sill 27 as a fulcrum. Although the bending moment is generated, the fitting structure 65Z of the fitting portion 65 of the right wall portion 57 of the front side member 25 at the front end of the side sill 27 has a mating contact surface 65Z according to this embodiment. Transmits the force to the lower wall portion 69 via the engaging portion 83 of the side sill 27, and at the rear, as shown in FIG. 9, the fitting portions 61 of the left and right wall portions 55, 57 of the front side member 25,
The fitting contact surfaces 61Z and 63Z of 63 transmit the force to the left wall portion 55 and the protruding piece 85 via the engaging portions 81 and 87 of the side sill 27. Further, the axial force F _Y is equal to the front side member 25.
The lower wall portion 53 and the left wall portion 55 are axially transmitted to the lower wall portion 69 and the inner wall portion 71 of the side sill 27.

Even when the vehicle body receives a bending load when the occupant is fully seated, a similar action is exerted on the connecting portion between the front side member 25 and the side sill 27 (however, the axial force F _Y Not transmitted).

10 to 12 are explanatory views of the operating state when viewed from the front of the vehicle body.

Input load F to the front side member 25
When viewed from the front of the vehicle body, as shown in FIG. 10, a first bending portion 47 of the front side member 25 has a force F _T for inclining the front side member 25 inwardly of the vehicle body and a force F _T ′ for bending upwardly of the vehicle body. Although the component force in the axial direction of compression load F _L of the front side member 25, the front side member 25
The force F _T that pushes the vehicle inward is the dash cross member 48.
And the force F _T ′ for bending the front side member 25 in the upward direction of the vehicle body is reduced by the strut housing 33.
Etc. Therefore, the coupling portion of the front side member 25 and the side sill 27, it will be the force F _L to defeat sill 27 front end portion in the vehicle body outside and downward directions is generated, according to the coupling structure according to this embodiment, As shown in FIG. 11, at the front end of the side sill 27, the fitting abutting surface 63X of the fitting portion 63 of the right wall portion 57 of the front side member 25 is attached to the projecting piece 85 via the engaging portion 87 of the side sill 27 and further to the front side. The fitting contact surfaces 65X and 65Z of the fitting portion 65 of the left wall portion 57 of the member 25 transmit the force to the lower wall portion 69 via the engaging portion 83 of the side sill 27. In the rear, as shown in FIG. 12, the fitting abutting surfaces 61X and 61Z of the fitting portion of the left wall portion 55 of the front side member 25 are further connected to the left wall portion 55 via the engaging portion 81 of the side sill 27, and The fitting abutting surface 63Z of the fitting portion 63 of the right wall portion 57 of the front side member 25 transmits the force to the projecting piece 85 via the engaging portion 87 of the side sill 27.

FIG. 13 and FIG. 14 are explanatory views showing the operating state when the vehicle turns.

When the entire vehicle body is twisted by an input when turning the vehicle, the front side member 25 receives a load such that the front side member 25 is twisted by the suspension input, but at the connecting portion of the front side member 25 with the side sill 27, as shown in FIG. The fitting contact surface 65X of the fitting portion 65 of the right wall portion 57 of the front side member 25 is the engaging portion 8 of the side sill 27.
3 transmits the force to the lower wall portion 69, and the left wall portion 55
The fitting contact surface 61X of the fitting portion 61 transmits the force to the inner wall portion 71 via the engaging portion 81 of the side sill 27.

As described above, according to the joint structure according to this embodiment, the front side member 25 and the side sill 2 are connected.
Since 7 is integrated and suppresses local deformation, the force is efficiently distributed to the rear of the vehicle body, so that the energy absorption characteristics at the time of a frontal collision can be improved and the molding is performed by using an extruded material. Therefore, the rigidity of the entire vehicle body can be improved.

15 and 16 show a modified side of the above embodiment.

That is, as is clear from the description with reference to FIGS. 10 to 12, the left wall portion 71 and the lower wall portion 69 of the side sill 27 largely share the transmission of the force from the front side member 25, and further, the front side member. Since the cutout portion 75 engages with 25, it becomes a load in the out-of-plane direction when an impact load is input.

Therefore, if the out-of-plane rigidity is increased, the energy absorption characteristic can be further improved.

As a means for this, the embodiment shown in FIG.
The thickness ts of the left wall portion 71 and the lower wall portion 69 of the side sill 27
With respect to the wall thickness tc of the right wall portion 73 and the upper wall portion 67,
s> tc.

In the embodiment shown in FIG. 16, a plurality of cavities 89 and 91 are respectively formed on the left wall portion 71 and the lower wall portion 69 which are formed thick to reduce the weight.

17 to 19 show another embodiment of the present invention. The same components and functional parts as those in FIGS. 1 to 14 are designated by the same reference numerals, and a duplicate description will be omitted.

In the embodiment shown in FIG. 17, the fitting portion which engages with the inner wall portion 71, the protruding piece 85 and the lower wall portion 69 of the side sill 27 is flanged to the left and right and up and down of the closed cross-section portion 59 of the front side member 25. It is formed by 93, 95 and 97. Further, by providing a flange 99 at the lower end of the left wall portion 55 of the front side member 25, it can be used to join the inner plate panel such as the floor 101 to the flange 99 by spot welding or the like.

In the embodiment shown in FIG. 18, the inner wall portion 103 connecting the upper wall portion 67 and the lower wall portion 69 is formed in the closed cross section of the side sill 27, and the left end of the lower wall portion 69 is bent upward. Then, the engaging portion 1 formed by bending the end portion inward of the vehicle body
Forming 05.

On the other hand, a fitting portion 107 that fits into the engaging portion 105 of the side sill 27 is formed at the lower end of the left wall portion 55 of the front side member 25.

The front side member 25 and the side sill 27 are connected to each other by connecting the upper wall portion 51 of the front side member 25, the fitting portions 61 and 107, the lower wall portion 53 and the right wall portion 57 to the upper wall portion of the side sill 27. 67, engaging portions 81, 10
5, the lower wall portion 69 and the inner wall portion 103 are fitted to each other.

According to this embodiment, the front side member 25 is fitted on the wide surface covered with the inner wall portion 71, the middle wall portion 103, and the upper and lower wall portions 67, 69 of the side sill 27, so that the front side member 25 and the front side member 25 are fitted together. The rigidity of the joint portion with the side sill 27 can be further improved, and the energy absorption characteristics at the time of a frontal collision can be further improved.

In the embodiment shown in FIG. 19, the left end of the lower wall portion 69 of the side sill 27 is bent upward to form the engaging portion 108, while the closed cross-section portion 59 of the front side member 25 is formed.
The inner wall portion 109 that connects the upper wall portion 51 and the lower wall portion 53 inside
And a fitting portion 11 that is fitted to the engaging portions 81 and 108 of the side sill 27 at the upper and lower ends of the inner wall portion 109.
1, 113 are formed.

The front side member 25 and the side sill 27 are connected to each other by partially inserting the upper and lower wall portions 51 and 53 of the front side member 25 into the upper and lower wall portions 6 of the side sill 27.
7 and 69, and the fitting portions 111 and 113 are fitted to the engaging portions 81 and 108.

According to this embodiment, since the vertical force is transmitted even when the upper and lower wall portions 51 and 53 of the front side member 25 and the upper and lower wall portions 67 and 69 of the side sill 27 are fitted to each other, the energy absorption characteristic is improved. It can be improved.

20 to 22 show still another embodiment of the present invention. The same components as those in FIGS. 1 to 14 are designated by the same reference numerals, and the duplicated description will be omitted.

In this embodiment, the front side member 25
Fitting portions 115 and 117 are formed at the upper end portion of the left wall portion 55 and the lower end portion of the right wall portion 57, respectively, in a direction that connects them substantially, while the lower end portion of the inner wall portion 71 of the side sill 27 and the lower wall portion 6 are formed.
Engagement portions 119 and 121 that engage with the fitting portions 115 and 117 of the front side member 25 are formed at the left end portion of 9.

The front side member 25 and the side sill 27 are connected to each other by inserting the front side member 25 into the cutout portion 75 of the side sill 27, and the rear end surface of the lower wall portion 53 and the left wall portion 55 of the front side member 25. Abutting portions 77 of the lower wall portion 69 and the inner wall portion 71 of the side sill 27,
79, but the fitting portions 63, 115, 117 of the front side member 25 are engaged with the side sill 2
7 engaging parts 87, 119, 121 respectively.

According to this embodiment, the inner wall portion 71 of the side sill 27 and the engaging portions 119 and 121 of the lower wall portion 69, which largely share the transmission of the force from the front side member 25, are formed in the direction in which they are connected to each other. Therefore, since the energy is efficiently transmitted as shown in FIGS. 21 and 22, the energy absorption characteristics can be further improved.

The side member can be applied to a rear side member or the like.

[0054]

As is apparent from the above description, according to the first aspect of the invention, the input to the side member due to a frontal collision or the like is performed through the butting of the fitting receiving surface and the fitting receiving surface. Since the load is stably and efficiently transmitted while suppressing local deformation from the member to the side sill, it is possible to improve the energy absorption characteristics at the time of a collision and to improve the rigidity of the entire vehicle body.

According to the second aspect of the present invention, the abutting surface for abutting the end surface of the side member is provided by a simple structure in which the notch is formed in the side sill, and the load in the front-back direction of the side member is also efficient. Can communicate well.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a rear end side of a front side member and a front end side of a side sill as a vehicle body lower member coupling structure according to an embodiment.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a perspective view showing an overall configuration of a vehicle body frame to which the present invention is applied.

FIG. 4 is an explanatory plan view showing an operation state in a joint portion between a front side member and a side sill according to the present invention.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a sectional view taken along the line VI-VI of FIG.

FIG. 7 is a side explanatory view showing an operation state in a joint portion of the front side member and the side sill according to the present invention.

8 is a sectional view taken along the line VIII-VIII of FIG.

9 is a sectional view taken along the line IX-IX of FIG.

FIG. 10 is a front explanatory view showing an operating state of a joint portion between a front side member and a side sill according to the present invention.

11 is a cross-sectional view taken along the line XI-XI of FIG.

12 is a sectional view taken along line XII-XII of FIG.

FIG. 13 is a perspective explanatory view showing an operating state at the time of vehicle turning at the joint portion of the front side member and the side sill according to the present invention.

14 is a sectional view taken along the line XIIII-XIIII of FIG.

FIG. 15 is a cross-sectional view of a joined portion of a front side member and a side sill showing a modified side of FIG.

FIG. 16 is a cross-sectional view of a joined portion of a front side member and a side sill showing the modified side of FIG.

FIG. 17 is a perspective view showing another embodiment of the present invention.

FIG. 18 is a perspective view showing another embodiment of the present invention.

FIG. 19 is a perspective view showing another embodiment of the present invention.

FIG. 20 is an exploded perspective view showing another embodiment of the present invention.

21 is a cross-sectional view taken along the line XXI-XXI of FIG.

22 is a sectional view taken along the line XXII-XXII of FIG.

FIG. 23 is a perspective view of a front body frame according to a conventional example.

24 is a cross-sectional view of a frame material forming the front side frame of FIG. 23.

FIG. 25 is a side view showing a partial cross section of the front side frame.

[Explanation of symbols]

25 Front side member 27 Side sill 61, 63, 65 Fitting portion 61X, 61Z, 63X, 63Z, 65X, 65Z Fitting contact surface 75 Notch portion 77, 79 Hitting surface 81, 83, 87 Engaging portion 81X, 81Z, 83X , 83Z, 87X, 87Z Fitting receiving surface 93, 95, 97 Flange (fitting part) 107, 111, 113 Fitting part 105, 108 Engaging part

Claims (2)

[Claims] 1. A connecting structure of a vehicle body lower member for connecting a side member of a vehicle body lower portion and a side sill extending in a closed cross-section structure having a constant cross section, wherein an end of the side sill has a lateral direction and a vertical direction of the vehicle body. Direction, at least a pair of fitting receiving surfaces are provided, and at the end of the side member, at least a pair of fitting abutting surfaces are provided in the left-right direction and the up-down direction of the vehicle body, and the fitting receiving surfaces are provided with the fitting surfaces. A joint structure for a vehicle body lower member, wherein an end portion of the side member is joined to an end portion of the side sill so as to abut against the present surface. 2. The vehicle body lower member coupling structure according to claim 1, wherein a notch is formed in an end portion of the side sill, and an abutting surface for abutting an end surface of the side member is provided. Coupling structure of lower body members.