JPH061129U - Vehicle frame structure - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To properly set and improve the bending rigidity of the left and right crank-shaped bent parts of the frame. [Configuration] First and second frame members 1L having U-shaped cross sections
In a frame 1L of a vehicle in which a first closed cross section is formed by joining a and 1Lb facing each other, bending is performed within a second closed cross section C of a vehicle width direction bending portion of the frame. Reinforcing member 6 which is arranged along the direction and which connects the upper portion and the lower portion of the vertical wall portion 10 of the frame and forms a second closed cross-section portion between the vertical wall portion and the vertical wall portion. By fixing the joints, it is possible to improve the reinforcing effect against buckling deformation and control the bending rigidity of the entire bent portion.

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, for example, as shown in FIG. 4, 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 often used as a vehicle body structure of an automobile.

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. In addition, even if the same frame is used, changing the cabin can easily increase the number of vehicle types. The side rails that perform this action are bent inward at the front and rear axle mounting portions to have a narrow width, and the frame itself has a generally U-shaped cross section. Has a closed cross-section structure in which the frame members are joined to face each other (see, for example, Japanese Utility Model Laid-Open No. 3-55381).

[0004]

[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 thickness of the first and second frame members forming the vehicle body side frame having the closed cross-section structure is made as thin as possible. Since the rigidity of the curved portion is insufficient, it becomes impossible to absorb sufficient collision energy at the time of a head-on collision, etc., and there is a concern that the interior side of the vehicle may be affected by buckling deformation and over-deformation.

In particular, 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 portion in the vehicle width direction.

[0006]

[Means for Solving the Problems]

 The frame structure of the vehicle according to the present invention is intended to solve the above problems, and is configured as follows.

That is, the vehicle body frame of the present invention is a vehicle frame having a first closed cross section formed by joining first and second frame members having U-shaped cross sections in a state of facing each other. In this frame, the frame is arranged along the bending direction within the closed cross section of the curved portion in the vehicle width direction, and the upper and lower portions of the vertical wall portion of the frame are connected and the vertical intermediate portion is A reinforcing member that forms a second closed cross-section portion is joined and fixed to the vertical wall portion.

[0008]

[Action]

 In the structure of the vehicle body frame, first, in a frame of a vehicle in which first and second frame members having a U-shaped cross section are joined in a state of being opposed to each other, a first closed cross section is formed, A reinforcing member is arranged along the bending direction in the first closed cross section of the bending portion in the vehicle width direction of the frame.

The reinforcing member connects the upper portion and the lower portion of the vertical wall portion of the frame, and is located at an intermediate portion in the up-down direction of the frame, and further has a second portion between the vertical wall portion and the vertical wall portion. It forms a closed surface.

Therefore, first, by the structure in which the vertical wall portions of the frame member are connected to each other at the upper and lower sides, a sufficient reinforcing effect is exerted against the buckling deformation at the time of the impact force action.

Next, a second closed cross-section portion is further formed at an intermediate portion between the upper and lower joining portions, and the second closed cross-section portion vertically and when the impact force acts and the vehicle. It becomes possible to properly control the bending state in the width direction.

[0012]

[Effect of device]

 Therefore, according to the frame structure of the vehicle of the present invention, the reinforcement strength of the frame buckling portion in the vertical direction and the vehicle width direction is improved and the appropriate bending state control at the time of collision deformation is performed without increasing the weight of the vehicle body. Therefore, it is possible to realize an appropriate frame deformation structure at the time of a vehicle collision.

[0013]

【Example】

 1 to 4 show a vehicle frame structure according to an embodiment of the present invention.

First, FIG. 4 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 rear portions of the front axle mounting portions 3L and 3R and the front portions of the rear axle mounting portions 4L and 4R. It is bent in a substantially crank shape vertically and horizontally (vehicle width) at the positions 5F and 5R.

[0016] The front axle mounting portions 3L, 3R and the rear axle mounting portions 4L, 4R are provided without any cross member at the portion 7 of the pair of side rails 1L, 1R corresponding to the vehicle compartment floor. Only the part of is connected by cross members 2F and 2R to each other for reinforcement.

By the way, the pair of side rails 1L and 1R of the vehicle body frame 1 configured as described above includes, for example, a first frame member 1La (1Ra) having a U-shaped cross section as shown in FIGS. 1 and 2. And the second frame member 1Lb (1Rb) are opposed to each other and joined to each other, and the first closed cross-section structure is formed. The plate thickness of each member 1La (1Ra), 1Lb (1Rb) reduces the weight of the vehicle body. It is formed relatively thin from the viewpoint of achieving.

Therefore, for example, when an impact force at the time of a vehicle front collision as shown in F of FIG. 1 is applied to the crank-shaped curved portion at the rear position 5F of the front axle mounting portions 3L, 3R, the strength is not increased as it is. It is too low to control the bending condition properly, and as a result, the impact energy cannot be absorbed properly, causing buckling deformation, and in some cases, a large deformation to the passenger compartment side may be caused. is there.

Therefore, in this embodiment, as shown in, for example, FIGS. 1 to 3, the portion 5F is inscribed in the inner corner surface of the outer first frame member 1La (1Ra) in particular, and is cut as a whole. A reinforcement member 6 having a U-shape and a second closed cross-section portion C is welded to the vertical middle portion of the vertical wall portion 9 of the first frame member 1La (1Ra). Therefore, it is properly reinforced and the bending state is appropriately controlled.

The reinforcing member 6 having a U-shaped cross section has, for example, the upper and lower edges 6a and 6b and the upper and lower predetermined width portions 10a and 10b of the vertical wall portion 10 which are arranged above and below the first frame member 1La (1Ra). The second closed cross-section C is formed by welding and joining the corner surfaces and bending the middle part between them inward in a U-shaped cross-section. It is made of high rigidity.

Weltotts 13 and 14 for mounting auxiliary equipment are provided at the two projecting edges 11 and 12 of the lower edge 6b in the front-rear direction.

As a result, in this configuration, the rigidity of the front side crank-shaped bent portion (5F portion) of the side rails 1L, 1R is higher than a predetermined level with respect to the bending moment in the direction of arrow (a) in FIG. In addition, the bending moment becomes particularly high with respect to the bending moment in the arrow (B) direction in FIG.

Therefore, for example, even when an impact force at the time of a head-on collision of the vehicle as shown by an arrow F in FIG. 1 is applied, the impact force cannot be appropriately deformed upward and outward. However, movement to the passenger compartment side can be sufficiently blocked. Moreover, the weight does not have to be increased too much.

That is, in the configuration, first, the first and second frame members 1La (1Ra), 1Lb (1Rb) having a U-shaped cross section are joined in a state of being opposed to each other to form a first closed cross section. In the frame 1 of the vehicle having the above-described structure, the reinforcing member 6 is arranged along the bending direction within the first closed cross section of the vehicle width direction bending portion (5F) of the frame 1.

The reinforcing member 6 connects the upper portion and the lower portion of the vertical wall portion 9 of the first frame member 1La (1Ra) of the frame 1 and is located in the vertical middle portion thereof. A second closed cross-section portion C is formed with the vertical wall portion 9.

Therefore, first, the structure in which the vertical wall portions 9 are connected to each other at the upper and lower sides provides a sufficient reinforcing action against buckling deformation at the time of impact force.

Next, a second closed cross section C is further formed at an intermediate portion between the upper and lower joints, and the impact is set by appropriately setting the second closed cross section C. It is possible to appropriately control the bending state in the vertical direction and the vehicle width direction when a force is applied.

Further, since the upper and lower predetermined width portions 10a and 10b of the vertical wall portion 10 are joined to the vertical wall portion 9 of the frame member with respect to the bending in the vertical direction, the plate thickness is said to be increased. Similarly, the reinforcing effect is exhibited from the beginning of bending.

Therefore, according to the frame structure of the vehicle of the present invention, the reinforcement strength of the frame buckling portion in the up-down direction and the vehicle width direction and the appropriate bending at the time of collision deformation can be achieved without increasing the weight of the vehicle body. The state can be controlled, and an appropriate frame deformation structure at the time of a vehicle collision can be realized.

[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 plan view of a main part of the frame structure.

FIG. 4 is a perspective view showing a schematic structure of the entire vehicle frame.

[Explanation of symbols]

1L and 1R are side rails, 2F and 2R are cross members, 3L and 3R are front axle mounting portions, 4L and 4R are rear axle mounting portions, 6 is a reinforcing member, 6a is an upper edge portion, 6b is a lower edge portion, 9 Is a vertical wall portion of the first frame member 1La (1Ra), 10 is a vertical wall portion of the reinforcing member 6, and C is a second closed cross-section portion.

Claims (1)

[Scope of utility model registration request] 1. A vehicle frame in which a first closed cross section is formed by joining first and second frame members having a U-shaped cross section in a state of facing each other, and a vehicle width of the frame. It is arranged along the bending direction within the closed cross section of the direction bending portion, and connects the upper portion and the lower portion of the vertical wall portion of the frame, and the second portion between the vertical wall portion and the vertical wall portion at the intermediate portion in the vertical direction. A frame structure for a vehicle, wherein a reinforcing member forming a closed cross section is fixedly joined.