JPS5889475A - Back and front direction reinforcing member for car - Google Patents

Abstract

PURPOSE:To absorb the energy efficiently by providing a branch member at the end section of a side frame and making into approximately Y-shape thereby producing the wall face buckling sequentially even for the external force from the front and oblique direction. CONSTITUTION:The end section of a side frame 1 is formed approximately in Y-shape by a main frame 2 and a sub-frame 3, then a cross member 4 is fixed in the width direction. The main frame and the sub-frame have the closed cross- section. A weak force section 10 is also formed. Since the side frame is constructed in such a manner, the wall face buckling is produced sequentially by the external force from the front and oblique direction thereby the bending deformation will never occur. Consequently the energy absorption is performed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in longitudinal strength members such as automobile frames or side members.

BACKGROUND ART Side members in a frame or a monocoque body of an automobile have a structure that deforms and absorbs energy while resisting external forces from the vehicle longitudinal direction or diagonal longitudinal direction that cause the member to buckle.

The most efficient structure for absorbing the energy of external forces is generally one in which the front-rear strength members of the frame or side members undergo wall buckling that sequentially deforms them into a bellows shape from the front to the rear. It is said that

However, in order to stably perform the wall buckling,
ciJ, it is desirable to match the axial direction of the applied load with the axial direction of the longitudinal strength member, but this is often not always possible due to the relationship with other structural requirements of the vehicle.

In this case, the longitudinal strength members must be offset vertically and horizontally according to the layout of the vehicle configuration. Energy absorption of such longitudinal strength members mainly results in bending deformation.

For this reason, conventionally, in order to increase energy absorption due to bending deformation of the longitudinal strength member, the plate thickness of the member is increased in order to increase the bending rigidity at the offset portion,
Some vehicles have taken measures such as reinforcement or gusset plates in the front-rear strength members, but these measures inevitably increase the vehicle electric field, which in turn worsens the vehicle's fuel efficiency. There are problems.

The present invention has been made in view of the above-mentioned conventional problems, and is able to efficiently respond to external forces not only from the front but also from diagonal directions by sequentially causing wall surface buckling in the front and back direction. An object of the present invention is to provide a longitudinal strength member for an automobile that absorbs the energy of the vehicle.

The present invention achieves the above object by providing a branch member extending in a substantially Y-shape in the vehicle width direction at the tip, and attaching a cross member to the tip to connect the branch member in the vehicle width direction.

Further, the present invention is provided with a branching member that expands in a substantially Y-shape in the vehicle width direction toward the distal end, and a cross member is attached to the distal end to connect the branching member in the vehicle width direction. The above object is achieved by providing at least one connecting member that connects the branching member in the vehicle width direction at a position between the branching point and the tip.

Further, the present invention achieves the above object by making the coupling member in the longitudinal direction strength member of the automobile a vertical plate-like member having a flange coupled to the opposing inner and lower surfaces of the branching member. be.

Further, the present invention provides that the coupling member is attached across both the branch members in the longitudinal direction strength member of the automobile,
The above object is achieved by forming a connecting portion of flat plate-like members that constitute a part of these branch members.

Further, the present invention provides the above-mentioned object by forming the flat coupling member in the strength member for an automobile so that a plurality of coupling portions and holes are alternately formed in the front-rear direction at locations between the branching members. The goal is to achieve the following.

Further, the present invention provides a strength member for a vehicle, in which the front R
e The distance arbitrarily set in advance between the branch point of the Y-shape and the cross member is set as a deformation length that will efficiently absorb energy when the member receives external force in the front, back, or diagonal direction that causes it to buckle. This achieves the above objective.

Further, the present invention provides a longitudinal strength member for an automobile,
In the snow near the central part in the longitudinal direction of the vehicle than the Y-shaped branching part, the front nine support members on the left and right in the width direction of the vehicle are connected to the second cross member, and the front corner on the inside of the joint part is , the above objective is achieved by intervening reinforcement.

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

FIG. 1 is a perspective view 1 showing a first practical example of the present invention. In this @1 embodiment, the front-rear strength member is connected to the front-rear side frame 1 of the automobile. (Figure 1 shows only the right front part of the side frame 1). As shown in the figure, this side frame 1 includes a main frame 2 and a sub-frame 3 that are distributed in a substantially Y-shape in the vehicle width direction toward the distal end. A front cross member 4 is attached to the tip of the front cross member 4 to connect them in the vehicle width direction, and between the Y-shaped branch point 5 and the front cross member 4, the front main frame 2 and the sub frame 3 are connected in the vehicle width direction. It has a connecting member 6 that connects in the direction.

Further, the side frame IFi is integrally connected to the upper surface of the suspension cross member 7 extending in the vehicle width direction at a position rearward of the branch point 5 in a state perpendicular to the suspension cross member 7. A reinforcement 8 is integrally attached to the inner front corner of the joint between the suspension cross member 7 and the side frame 1 so as to connect the two.

The number 9 in the diagram shows the front suspension mount.

The side frame 1, main frame 2, and subframe 3Fi each have a rectangular cross section and a closed cross section inside. , and the main frame 2
are substantially aligned with the side frame 1 and arranged in the front-rear direction of the vehicle, and the sub-frame 3 is arranged at 21 to 22 in front of the vehicle and in the open direction with respect to the main frame 2.
It is placed at an angle of 100 degrees.

This angle is an angle of 30 degrees with respect to the longitudinal centerline of the vehicle, and is the most efficient angle for wall buckling in response to an external force applied diagonally from the front, thereby absorbing energy through theoretical calculations and experiments. It is based on the value determined by However, the angle is the same as that of the suspension cross member 7.
Changes can be made to some extent depending on the joining position between the main frame 2 and the main frame 2, whether or not the reinforcement 8 is attached, and its stringency.

The main frame 2 and the sub-frame 3 are smoothed so that the cross-sectional area thereof becomes smaller toward the distal end, which reduces the influence of the vertical offset of the main frame 2 and the sub-frame 3. It is for. The reference numeral 10Fi in the figure indicates a weak force portion consisting of a bead or corrugation formed on the lower surface of the main frame 2 and subframe 3. By making the space closer to the front end larger, or by making the distance in the front-rear direction smaller towards the front end.

The front end sides of the main frame 2 and sub-frame 3 are designed to easily cause wall buckling.

The side frame l shown in FIG. 1 is assembled as shown in FIG. 2. FIG. 2 is an exploded perspective view of the main parts of the side frame l.

As shown in FIG. 2, the main frame 2 consists of a member IA having a substantially hat-shaped cross section that is integrally continuous with the side frame 1, and the upper surface of the member IA is covered by a main frame plate 2A and a frame brake (IBK) (9). The bent subframe 3 is attached to a member 3A having a substantially hat-shaped cross section that is attached to the outer surface of the member IA so as to project diagonally forward.
3B and said frame brake) formed by covering its upper surface with IB.

That is, the frame plate IB is approximately Y-shaped so as to cover the vicinity of the branching point 5 of the main frame 2 and the sub-frame 3, and
and the sub frame plate 3BFi, and the main frame 2 continuously to the RjT of the frame plate IB.
and is attached to cover the subframe 3.

As shown in the enlarged view in FIG.
It is a vertical plate-like member equipped with B, and when an external force is applied from the front of the main frame 2 and sub-frame 3 and they try to open, it resists by lateral tensile force,
Main frame [10] Maintains the T-shape of the frame 2 and subframe 3.

Further, the shape of the connecting member 6 is characterized by being in the shape of a vertical plate as described above so as to have the above-mentioned function and not interfere with the wall buckling of the main frame 2 and the sub-frame 3 to absorb energy. shall be.

Further, as shown in an exploded state in FIG. 4, the reinforcement 8 covers the front and rear and upper surfaces of the suspension cross member 7, and is integrally attached to the inner surface of the side frame 1 while being in contact with them. It is welded.

In addition, this reinforcement 8 is 1 in FIG.
As shown by the dotted chain line 8A, the side frame 1 and the suspension cross member 7 have a triangular part constituting a so-called diagonal member in a plane, and this allows the side frame 1 to move inward in the vehicle width direction. This prevents it from being deformed so as to tilt.

In this embodiment, the main frame 2 and the subframe 3 are not bent by external forces applied not only in the longitudinal direction of the vehicle but also in the diagonal longitudinal direction, and the wall surface buckles sequentially from the tip, thereby efficiently applying external forces. It has the advantage of being able to absorb energy.

In particular, this prevents the connecting member 6Fi, main frame 2, and subframe 3 from being expanded by external force.
Wall buckling is effectively achieved. Furthermore, since the connecting member 6Fi has a simple vertical plate shape, it has the advantage of being lightweight and low cost.

Furthermore, the reinforcement 8 effectively prevents the main frame 2 and subframe 3 from being bent inward in the vehicle width direction while maintaining the figure 7 shape due to external force, so that the main frame 2 and subframe 3 Fi axis It has the advantage of being able to deform in one direction and efficiently absorb the energy of an external force.

Furthermore, the connecting member 6 maintains the figure 7 shape of the main frame 2 and the sub-frame 3 against external forces from the vehicle longitudinal direction or diagonal longitudinal direction by its tensile resistance.
This prevents the joint part 1 between the tip of the front cross member 4 and the front cross member 4 from coming off, such as a spot weld, and thereby deforms the main frame 2 or subframe 3 in the axial direction so that it can efficiently absorb the energy of external force. It is something to do.

In the above embodiment, as shown in FIG. 2, the subframe 3 is attached to the side surface of the main frame 2, but as shown in FIG.
The side frame 1 and the sub-frame 3 may be integrally bent and formed, and the main frame 2 may be attached to the inner surface thereof.

Furthermore, the number and configuration of the connecting member 6ti that connects the main frame 2 and the sub-frame 3 in the horizontal direction are not limited to the embodiment shown in FIG. 1; Any material that can maintain the figure 7 shape of the frame 2 and subframe 3 may be used.

Therefore, it may be configured as shown in FIG. 6, for example. That is, the connecting member 16 in this embodiment is constructed by integrating the main frame plate 2A and the sub-frame plate 3B, which cover the upper surfaces of the main frame 2 and sub-frame 3, into a flat plate-like member. The connecting member 16 is provided with a plurality of connecting portions 16A and holes 16B alternately in the front-rear direction at a position above the space 11 between the main frame 2 and the sub-frame 3.

In this embodiment, the connecting member 16 always resists the external force that tries to expand the main frame 2 and the sub-frame 3 by a tensile force, and is seated sequentially in the front-rear direction together with the main frame 2 and the sub-frame 3. It is bent and deformed, thereby absorbing the energy of external force more efficiently and sufficiently.

In the embodiment shown in FIG. 6, the connecting portions 16A of the connecting member 16 are arranged rearward at equal intervals from the vicinity of the front cross member 4, but the arrangement of the connecting portions 16A and the holes 16B is different from that shown in the figure. The present invention is not limited to the above embodiments. Therefore, for example, the width of the connecting portion 16A in the longitudinal direction may be made narrower as it approaches the front cross member 4, thereby making it easier for wall buckling to occur as it approaches the front cross member 4, similar to the weak force portion 10. You can also do this. In this case, there is an advantage that wall surface buckling due to external force is performed smoothly.

Alternatively, the connecting portion 16AH1 may be formed up to between the Y-shaped frame plates IB by 5K.

The distance between the additional trap connecting portion 16AH and the front cross member 4 may be made the same as the deformation length preset between the Y-shaped branch point and the front cross member.

In addition, reinforcement 8Vi in each of the above embodiments,
As shown in FIG. 4, there are nine types of reinforcements, which are welded to the front and rear surfaces and upper surfaces of the suspension cross member 7, and to the inner surface of the side frame 1. Any structure may be used as long as it includes the triangular portion 8A so as to prevent it from being bent inward.

Therefore, bolt holes 12 may be formed as shown in FIG. 7, and the suspension may be fixed to the side frame 1 and the suspension cross member 7 with bolts. Further, as shown in FIG. 8, the structure may be divided into a triangular portion 8A and a quadrangular portion 8B on which the suspension cross member 7 is seated.

In the above embodiment, in order to maintain the shape of the 7-shaped main frame 2 and the subframe 3, the two are connected in the horizontal direction by a trap, a connecting member 6, or a tl16, but in the present invention, the connecting member 6 This also includes cases where HI3 is not present. That is, the coupling member 6 or Fi16
mainframe 2 and subframe 3 even if
If the rigidity is sufficient to maintain the figure 7 shape against external forces, the connecting member 6 or #'i16 is not necessarily required.

Although the above-mentioned embodiment relates to the front side of the side frame of an automobile, the present invention is also applicable to the rear side K(15). Furthermore, the present invention is generally applied to longitudinal strength members of automobiles, and therefore also to side members of monocoque bodies without frames.

The float cross member 4 may also serve as a member or member reinforcement.

Since the present invention is constructed as described above, it has the advantage of being able to cause wall buckling to effectively absorb the energy of external forces applied not only in the longitudinal direction of the automobile but also in the diagonal longitudinal direction. It has a great effect. In addition, since the figure-7 shape can be maintained against external forces such as those mentioned above, these external forces can be applied to the entire front-back strength member in an axial scuttling action, and this trap has the effect of reliably absorbing energy. have

In addition, the entire figure 7-shaped longitudinal strength member is prevented from being bent inward in the width direction of the vehicle body in response to the above-mentioned external force. It has the excellent effect of efficiently absorbing energy when used as a side dish.

[Brief explanation of the drawing]

The first is a perspective view showing an embodiment of the longitudinal strength member for an automobile according to the present invention, the second figure is an exploded perspective view of the main parts of the same embodiment, and the third figure is an enlarged view of the connecting member in the same embodiment. 2, FIG. 4 is an exploded perspective view showing the vicinity of the reinforcement in the same embodiment, FIG. 5 is an exploded perspective view similar to FIG. 2, showing the second embodiment of the present invention, and FIG. is the third aspect of the present invention.
FIG. 7 and FIG. 8 are a perspective view and an exploded perspective view showing other embodiments of the reinforcement. l...Side frame, 2...Main frame, 3
...Subframe, 4...Front cross member. 5... Branch point, 6... Connection member, 6A... 7 lange, 6B... Flange, 7... Suspension cross member, 8... Reinforcement, 16... Connection member, 16A...Connection part, 16B...Hole part. 118)

Claims (7)

[Claims] (1) A front-rear strength member for an automobile, which has a branching member expanded in a substantially Y-shape in the vehicle width direction at its tip, and a cross member that connects the branching member in the vehicle width direction is attached to its tip. (2) A branch member is provided that expands into a substantially Y-shape in the vehicle width direction toward the tip, and a cross member is attached to the tip to connect the branch member in the vehicle width direction, and the Y-shaped branch A strong electric member in the longitudinal direction of an automobile, comprising at least one connecting member that connects the branching member in the vehicle width direction at a position between a point and a tip. (3) The longitudinal direction of the automobile according to claim 2, wherein the coupling member is a vertical plate-like member having a flange coupled to the opposing inner and lower surfaces of the branching member. Strong electric parts. (4) The connecting member is attached across both the dividing members and is formed by a connecting part of a flat plate member that constitutes a part of these branching members. A longitudinal strength member for automobiles. (5) The automobile according to claim 4, wherein the flat coupling member has a plurality of coupling portions and holes alternately formed in the front-rear direction at locations between the branching members. Anteroposterior strength member. (6) Between the Y-shaped branch point and the cross member,
Claim 2, characterized in that the distance arbitrarily set in advance is a predetermined deformation length that efficiently absorbs energy when the member receives an external force in the front, back, or diagonal direction that causes it to buckle. The longitudinal strength member of an automobile according to any one of items 1 to 5 above. (7) The left and right longitudinal strength members in the vehicle width direction are coupled to the second cross member at a position closer to the central part in the longitudinal direction of the vehicle than the figure-7-shaped branching part, and the longitudinal strength members on the left and right sides in the vehicle width direction are coupled to the second cross member, and A longitudinal strength member for an automobile according to any one of claims 1 to 6, characterized in that reinforcement is interposed therebetween.