JPH1149032A - Body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make rigidity easily adjustable in a side frame against collision in a longitudinal direction of an automobile. SOLUTION: In the inside of a side frame 2 arranged in right/left both sides of an engine room 1 in an automobile to be extended in a longitudinal direction, a sub-frame 5 consisting of pipe material is inserted from the forward, a front end thereof is tightened together by a bolt 7 to the side frame 2 and a bumper beam 6, also a rear end thereof is brought into contact with a front surface of a stopper 8 fixed to an inner surface in an intermediate part of the side frame 2. Since the sub-frame 5 can be easily mounted/demounted, when thickness of its pipe material is changed, rigidity of the side frame 2 can be arbitrarily adjusted, in the case that rigidity of the side frame 2 is desired to be low set, removal of the sub-frame 5 is only required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure provided with side frames extending in the front-rear direction on both right and left sides of a vehicle body, and more particularly to a vehicle body structure capable of easily adjusting a shock absorbing characteristic of a side frame in a collision. Vehicle body structure.

[0002]

2. Description of the Related Art In an automobile having an engine room and a trunk room in front and rear of a cabin, the rigidity of the engine room and the trunk room is set to be relatively low to form a crushable zone. By absorbing the impact of the collision, deformation of the cabin is prevented.

[0003]

By the way, a pair of left and right side frames arranged in the front-rear direction on both right and left sides of the vehicle body greatly affect the rigidity of the engine room and the trunk room at the time of collision. In order to change the rigidity of the side frame according to the user's preference, a plurality of types of side frames have to be designed and manufactured, which requires much time and money.

[0004] The present invention has been made in view of the above circumstances, and has as its object to easily adjust the rigidity of a side frame against a collision in the front-rear direction of an automobile.

[0005]

According to one aspect of the present invention, there is provided a vehicle body structure having a side member extending in a front-rear direction on both left and right sides of a vehicle body. A sub-frame is detachably supported inside the side frame comprising: a front end or a rear end of the vehicle body.

According to the above configuration, since the side frame is reinforced by the subframe, the rigidity against the impact of a collision applied to the front or rear surface of the vehicle body is increased. Further, since the sub-frame is detachable, the rigidity of the side frame can be arbitrarily adjusted by removing the sub-frame or replacing the sub-frame with one having a different strength. Moreover, since the sub-frame is housed inside the side frame, the sub-frame is prevented from interfering with other members, and the space can be effectively used.

According to a second aspect of the present invention, in a vehicle body structure having side frames extending in the front-rear direction on both left and right sides of the vehicle body, a sub-frame is detachably attached along an outer surface of the side frame. The subframe is supported, and one end of the subframe faces the front or rear surface of the vehicle body.

According to the above construction, since the side frame is reinforced by the subframe, the rigidity against the impact of a collision applied to the front or rear surface of the vehicle body is increased. Further, since the sub-frame is detachable, the rigidity of the side frame can be arbitrarily adjusted by removing the sub-frame or replacing the sub-frame with one having a different strength. Moreover, since the sub-frame is supported along the outer side surface of the side frame, it is possible to cope with a case where the sub-frame cannot be stored inside the side frame due to a curve of the side frame or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a perspective view of a front portion of a vehicle body of an automobile, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

As shown in FIGS. 1 and 2, a pair of side frames 2 and 2 extending in the front-rear direction of the vehicle body are disposed on both left and right sides of an engine room 1 formed in the front part of the vehicle body of the vehicle. Each of the side frame 2, the open surface of the channel-shaped member 3 has a welded box structure plate member 4, the flanges 2 _1, 2 ₁ is provided in the front end which opens toward the front of the vehicle body. Front subframe 5 made of a pipe member having a flange 5 ₁ is inserted from the front end of the side frame 2, the flanges 2 ₁ of side frames 2,
2 ₁ of the front and rear surface of the flange 5 ₁ subframe 5 abuts. The lateral direction of the vehicle body in each end flange ₆₁ of the bumper beam 6, 6 ₁ is provided extending, the rear surface of the flange ₆₁ and 62 ₁ being in contact with the front surface of the flange 5 ₁ subframe 5 , each flange 6 _1, 6 _1; 5 _1; 2 _1, 2 ₁ bumper beam 6 by two bolts 7 and 7 through the sub-frame 5 and the side frames 2 are fastened together. In this state, the rear end of the sub-frame 5 contacts the front surface of the stopper 8 fixed to the inner surface of the intermediate portion of the side frame 2.

When a collision impact is applied to the front of the vehicle body with the sub-frames 5 and 5 supported inside the left and right side frames 2 and 2, a compressive load is applied to the side frames 2 and 2 from the bumper beam 6. The rear ends of the sub-frames 5, 5 are transmitted to the stoppers 8, 8 of the side frames 2, 2.
, And a part of the compressive load applied to the side frames 2, 2 is supported by the sub-frames 5, 5, and the rigidity of the side frames 2, 2 is increased. Moreover, when the side frames 2 and 2 buckle due to the application of a large impact, the sub-frames 5 and 5 also buckle at the same time, so that the shock absorbing capacity is increased accordingly.

Since the sub-frames 5 and 5 are easily detachable, the rigidity of the side frames 2 and 2 can be arbitrarily adjusted by changing the thickness of the pipe material. If it is desired to lower the rigidity of the side frames 2 and 2, the sub-frames 5 and 5 may be removed. In this case, the flanges 2 ₁ ... Of the side frames 2 and 2 and the flanges 6 ₁ . If a spacer having the same thickness as the flanges 5 ₁ of the sub-frames 5 is sandwiched between the sub-frames 5, the mounting position of the bumper beam 6 does not change. Further, since the sub-frames 5 and 5 are housed inside the side frames 2 and 2, the space of the engine room 1 is not narrowed due to the mounting of the sub-frames 5 and 5, which affects the layout of other accessories. I do not give.

In the first embodiment, the subframes 5, 5
Although a pipe member having a circular cross section is used, as shown in a modified example of FIG. 3, the two frame members 9 and 10 bent into a crank shape in cross section are integrally welded to form a sub-frame 5 having a box cross section. , 5 are also possible.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the second embodiment, sub-frames 5 and 5 made of pipe material are mounted along the upper surfaces of the side frames 2 and 2. L-shaped brackets 11 and 12 are welded to both front and rear ends of each subframe 5, and these brackets 11 and 12 are fixed to the upper surface of the side frame 2 with bolts 13, 13; The flanges 6 ₁ ... Provided at the lower ends of both ends of the bumper beam 6 are bolts 7.
In is fixed to the flange 2 ₁ provided at the front end of the side frame 2, the flange 6 ₂ ... provided at the upper portion of both ends of the bumper beam 6 is bolted 15 to the bracket 11 of the front end of the sub-frame 5.

According to the second embodiment, the rigidity of the side frames 2, 2 is arbitrarily adjusted by attaching and detaching the sub-frames 5, 5 or by changing the strength of the sub-frames 5, 5. can do. In particular, since the sub-frames 5, 5 are arranged along the outer surfaces of the side frames 2, 2, the outer diameters of the sub-frames 5, 5 can be determined without being influenced by the inner diameter of the side frames 2, 2. This is effective when the side frames 2 and 2 are curved and the sub-frames 5 and 5 cannot be stored inside.

In the second embodiment, both ends of each sub-frame 5 are fixed to the side frame 2 by the brackets 11 and 12, but as shown in a modified example of FIG. It can be fixed to the side frame 2 with bolts 15 at a plurality of locations in the longitudinal direction. By fixing a plurality of portions in the longitudinal direction of the sub-frame 5 to the side frame 2 in this manner, the side frame 2 and the sub-frame 5 can be firmly integrated to further increase the rigidity.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the side frames 2 and 2 arranged in the engine room 1 of the car have been described. However, the present invention can be applied to the side frames arranged near the trunk room of the car. It is possible.

[0021]

As described above, according to the first aspect of the present invention, since the side frame is reinforced by the subframe, the rigidity against the impact of a collision applied to the front or rear surface of the vehicle body is enhanced. Further, since the sub-frame is detachable, the rigidity of the side frame can be arbitrarily adjusted by removing the sub-frame or replacing the sub-frame with one having a different strength. Moreover, since the sub-frame is housed inside the side frame, the sub-frame is prevented from interfering with other members, and the space can be effectively used.

According to the second aspect of the present invention,
Because the side frame is reinforced by the subframe,
The rigidity against the impact of a collision applied to the front or rear surface of the vehicle body is increased. Further, since the sub-frame is detachable, the rigidity of the side frame can be arbitrarily adjusted by removing the sub-frame or replacing the sub-frame with one having a different strength. Moreover, since the sub-frame is supported along the outer side surface of the side frame, it is possible to cope with a case where the sub-frame cannot be stored inside the side frame due to a curve of the side frame or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a front portion of a vehicle body of an automobile.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a diagram showing a modification of the first embodiment.

FIG. 4 is a graph showing an attached state of a subframe according to a second embodiment.

5 is an enlarged sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a diagram showing a modification of the second embodiment.

[Explanation of symbols]

 2 Side frame 5 Sub frame

Claims (2)

[Claims] 1. A vehicle body structure provided with side frames (2) extending in the front-rear direction on both right and left sides of a vehicle body, wherein a subframe (5) is detachably mounted inside the side frame (2) formed of a hollow member. And an end of the sub-frame (5) faces the front or rear surface of the vehicle body. 2. A vehicle body structure having side frames (2) extending in the front-rear direction on both left and right sides of a vehicle body, wherein a sub-frame (5) is detachably attached along an outer surface of the side frame (2). Support and its subframe (5)
The body structure of an automobile, characterized in that one end of the body faces the front or rear surface of the body.