JPH061130U - Vehicle frame structure - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To improve the bending rigidity of the crank-shaped bent portion in the up and down direction on the rear side of the vehicle body frame. A closed cross section is formed by joining inner first and outer second frame members 1La, 1Lb, which are U-shaped in cross section, in a state of facing each other, and has a bent portion bent in the vertical direction. In a frame of a vehicle, the reinforcing member 6 having a closed cross-section structure having a vertical wall portion 7 along the bending direction of the bent portion in the closed cross section of the vertically bent portion of the frame.
By joining and fixing the above to the outer second frame, the bending rigidity in the vertical direction is improved without increasing the weight.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle frame structure.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as shown in FIG. 3, for example, a frame in which side rails are passed around the floor of a passenger compartment and front and rear thereof are connected by cross members has been widely used as a vehicle body structure for automobiles.

A vehicle body having such a frame structure generally has high collision strength and withstand load strength, and the floor surface can be lowered as much as possible by bending the vehicle interior downward in a crank shape as shown in the figure. NVH is also good by interposing a rubber between it and the cabin. Further, even if the same frame is used, there are various merits such that the number of vehicle types can be easily increased by changing the cabin.

In this case, the side rail is formed into a closed cross-section structure by joining two sets of first and second frame members, which generally have a U-shaped cross section, facing each other (for example, See Japanese Utility Model Laid-Open No. 3-55381).

[0005]

[Problems to be solved by the device]

 However, recently, from the viewpoint of weight reduction of the vehicle body, there is a tendency that the plate thicknesses of the first and second frame members forming the vehicle body frame having the above-mentioned closed cross-section structure are made as thin as possible. The rigidity of the crank-shaped bent part from the vehicle side to the passenger compartment side is insufficient, and it becomes impossible to absorb sufficient collision energy at the time of a vehicle rear collision, etc. The problem arises.

Particularly, recently, attempts have been made to absorb the shock as effectively as possible by adopting a crushable structure at the front and rear ends of the frame. It is important to set the rigidity of the bent part.

[0007]

[Means for Solving the Problems]

 The frame structures of the vehicle body of the inventions according to claims 1 and 2 of the present application were made for the purpose of solving the above problems, and are respectively configured as follows.

(1) Configuration of a vehicle body frame structure according to a first aspect of the present invention In a vehicle body frame structure according to the first aspect of the present invention, inner first and outer second frame members having a U-shaped cross section are opposed to each other. In a frame of a vehicle having a curved section that is bent in the up-and-down direction by forming a closed cross section by joining in a state, bending of the curved section within the closed cross section of the vertical bending section of the frame It is characterized in that a reinforcing member having a closed cross-section structure having a vertical wall portion along the direction is provided by being joined and fixed to the outer second frame.

(2) Configuration of a vehicle body frame structure according to a second aspect of the invention A vehicle body frame structure according to the invention is based on the vehicle body frame structure according to the first aspect, and a reinforcing member in the same configuration. Has a main body member having a U-shaped cross section, the back side of the main body member is joined and fixed to the inner side surface of the outer second frame, and the vertical wall portion is provided between the upper and lower opening edges of the main body member. It is characterized by being connected to each other by means of to form a closed cross-section structure.

[0010]

[Action]

 The configurations of the frame structure of the vehicle body of the inventions according to claims 1 and 2 of the present application are configured as described above, and as a result, the following actions are achieved corresponding to the respective configurations.

(1) Operation of the vehicle body frame structure according to the first aspect of the invention. In the vehicle body frame structure according to the first aspect of the invention, as described above, the inner first and outer sides each have a U-shaped cross section. A frame of a vehicle in which a second closed frame structure is formed by joining the second frame members so as to face each other and the edges are overlapped with each other to form a closed cross-section structure, and a bent portion bent in the vertical direction is provided. A reinforcing member having a closed cross-section structure, which is located in the closed cross section of the upward and downward curved portion of the frame and has a vertical wall portion along the bending direction of the curved portion, is particularly located outside the overlapping portion. It is reinforced by joining and fixing it to the No. 2 frame.

Therefore, in the structure, first, the rigidity of the bending portion in the vertical direction of the frame with respect to the bending moment in the vehicle width direction is caused by the presence of the reinforcing member having the closed cross-section structure having the vertical wall portion along the bending direction. Becomes higher than a predetermined level, and becomes particularly high for a bending moment in the vertical direction.

Therefore, for example, even when an impact force in the front-rear direction is applied to the end portion of the frame on the side of the suspension attachment portion in the case of a vehicle rear collision, the bending portion extending from the end portion to the vehicle compartment side is The part is deformed upward to a certain extent so that the impact force can be appropriately absorbed by increasing the rigidity appropriately, but the movement toward the vehicle interior side can be reliably and sufficiently prevented. Further, in particular, since the reinforcing member is joined to the second frame outside the overlapping portion of the closed cross-section structure, it becomes possible to exert a sufficient reinforcing effect from the initial state during the bending deformation. The amount of bending toward the passenger compartment is also reduced.

Moreover, it is not necessary to increase the weight as a whole.

(2) Operation of the vehicle body frame structure according to the second aspect of the invention In the frame structure for a vehicle body according to the second aspect, as described above, the reinforcing member is a main body member having a U-shaped cross section. And the rear side of the main body member having a U-shaped cross section is joined to the inner side surface of the outer second frame, while the upper and lower opening edges of the main body member having the U-shaped cross section are connected to each other. The vertical wall portions connect to each other to form a closed cross-section structure.

Therefore, according to this configuration, the rigidity of the frame bending portion in the vertical direction is sufficiently reinforced by the main body member having a U-shaped cross section and the vertical wall portion of the reinforcing member having the closed cross section structure, and the vertical and vertical The rigidity with respect to the bending moment in the vehicle width direction is increased. In particular, the vertical bending rigidity is improved by adding two vertical walls, i.e., the vertical wall portion of the reinforcing member provided to the outer second frame and the main body member rear surface vertical wall. Due to the action, the rigidity against bending moments in the upward and downward directions becomes particularly high from the initial stage of deformation.

Therefore, for example, even when an impact force is applied at the time of a rear-end collision of the vehicle, the impact force is appropriately deformed to the upper side and the movement toward the vehicle interior is sufficiently prevented. become able to.

Moreover, it is not necessary to increase the weight as a whole.

[0019]

[Effect of device]

 Therefore, according to the frame structure of the vehicle of the present invention, the bent portion of the frame can be reinforced without increasing the weight of the vehicle body, and an appropriate frame strength at the time of vehicle collision can be realized. Like

[0020]

【Example】

 1 to 3 show a vehicle frame structure according to an embodiment of the present invention.

First, FIG. 3 shows the overall structure of the vehicle body frame 1 in this embodiment.

In the figure, reference numerals 1L and 1R are a pair of left and right side rails, and the side rails 1L and 1R correspond to the front portions of the rear axle mounting portions 4L and 4R and the rear portions of the front axle mounting portions 3L and 3R. It is bent in a substantially crank shape in both the vertical and horizontal directions at the portions 5F and 5R.

No cross member is provided in the portion FL corresponding to the vehicle compartment floor, and only the rear axle mounting portions 4L, 4R and the front axle mounting portions 3L, 3R are connected by the cross members 2R, 2F. Reinforced by connecting to each other.

By the way, the side rails 1L and 1R of the vehicle body frame 1 configured as described above include, for example, a first frame member 1La and a second frame member 1Lb having a U-shaped cross section as shown in FIG. Consists of a closed cross-section structure in which the upper and lower edge portions are polymer-bonded by facing each other in the relationship of inside and outside, and each member 1La, 1Lb is formed relatively thin for the purpose of weight reduction. There is.

Therefore, for example, when an impact force at the time of a vehicle rear collision as shown in F of FIG. 1 is applied to the crank-shaped bent portions of the front positions 5R, 5R of the rear axle mounting portions 4L, 4R, If the strength is left as it is, not only the strength is too low to absorb the impact energy, but also the deformation to the passenger compartment may occur.

Therefore, in the present embodiment, as shown in, for example, FIG. 1 and FIG. 2, an upper corner surface having a slight rounded surface inside the second frame member 1Lb located particularly outside the overlapping portion of the portion. The reinforcing member 6 having a U-shaped cross section and having a slight radius at the corner is welded to the inside to reinforce.

The reinforcing member 6 forms a closed cross-section structure having an I-shaped portion whose joining corner portion is a right angle by welding and joining the vertical wall portion 7 between the upper and lower edge portions 6a and 6b on the opening side. Although it is lightweight, it is formed with sufficient rigidity in both vertical and horizontal directions.

The opening side upper edge portion 6a is the upper edge portion 8 of the second frame member 1Lb, and the rear side vertical wall portion 6c is the outer side surface of the second frame member 1Lb vertical wall portion. It is fixed by joining to 9.

As a result, in this configuration, the rigidity of the rear side crank-shaped bent portion (5R) of the side rails 1L, 1R is greater than that of the bending moment in the arrow (a) direction (vehicle width direction) of FIG. The U-shaped body member effectively works to raise it to a predetermined level or higher, and the presence of two vertical wall parts, the back surface part of the reinforcing member and the vertical wall part (I part) (addition), causes an arrow. The rigidity against bending moment in the (b) direction (vertical direction) becomes particularly high. Regarding the reinforcing effect against the bending in the vertical direction, in particular, since the reinforcing member 6 is provided on the outer second frame 1Lb which is first deformed, a sufficient reinforcing effect is exhibited from the beginning when the bending stress acts. .

Moreover, the reinforcing member 6 is provided closer to the upper side of the second frame 1Lb of the frame closed cross section, that is, closer to the side having a smaller amount of expansion during bending deformation, and is effective until the end of bending. Exerts a reinforcing effect on.

Therefore, according to the frame structure, for example, even when an impact force at the time of a vehicle rear collision as shown by an arrow F in FIG. 1 is applied, the impact force can be appropriately absorbed to some extent. Although it is deformed to the upper side, the movement to the passenger compartment side can be sufficiently blocked. Moreover, the frame weight as a whole need not be increased so much.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing a frame structure of a vehicle according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the frame structure (FIG.
2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic perspective view showing an overall structure of a frame of the vehicle.

[Explanation of symbols]

1L and 1R are side rails, 1La is an inner first frame, 1Lb is an outer second frame, 2F and 2R are cross members, 3L and 3R are front axle mounting portions, 4L and 4R are rear axle mounting portions, and 6 is The reinforcing member, 7 is a vertical wall portion of the reinforcing member.

Claims (2)

[Scope of utility model registration request] 1. A closed cross section is formed by joining inner first and outer second frame members having a U-shaped cross section in a state of facing each other, and a bent portion bent in the vertical direction is provided. In the frame of the vehicle, the reinforcing member having a closed cross-section structure having a vertical wall portion along the bending direction of the bent portion in the closed cross section of the vertically bent portion of the frame is provided on the outer second frame. A frame structure for a vehicle, which is provided by being joined and fixed to each other. 2. The reinforcing member includes a main body member having a U-shaped cross section, the rear surface side of the main body member is fixedly joined to the inner side surface of the outer second frame, and the upper and lower opening edge portions of the main body member are joined together. The frame structure for a vehicle according to claim 1, wherein the vertical wall portions interconnect the spaces to form a closed cross-section structure.