JP2011201513A - Inrush preventive device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inrush preventive device for a vehicle having high strength, and further superior in an appearance, with a simple and lightweight structure.SOLUTION: This inrush preventive structure for a beam-shaped track is installed on a stay of a front end part or a rear end part of a vehicle, and extends in the vehicle width direction. The inrush preventive device includes a beam body 10 having a cross section of a square shape and extending in the vehicle width direction, and a reinforcing member 20 arranged in the beam body 10. The beam body 10 forms an insertion hole 11 in a position corresponding to the stay. The reinforcing member 20 includes a base part 21 contacting with a stay side inside surface of the beam body 10, and a support part 22 extending up to an inside surface on the opposite side of the stay of the beam body 10 from the center of the base part 21, and these are integrally molded by extrusion molding of an aluminum alloy. A pierce nut 30 is fixed to the base part 21, and the beam body 10 is fixed to the stay by threadedly engaging a bolt with the pierce nut 30.

Description

  The present invention is attached to a stay provided at a front end portion or a rear end portion of a vehicle such as a truck, and prevents a passenger vehicle having a low vehicle height from entering a lower portion of the truck or the like at the time of a frontal collision with a passenger car. More particularly, the present invention relates to an entry prevention device for trucks and the like that is lightweight and excellent in rigidity, and that has excellent workability and aesthetics.

  In recent years, there has also been a demand for lighter vehicle bodies in terms of environment, but there has also been a demand for improved safety against automobile collisions. From the viewpoint of safety, a large-sized vehicle such as a truck, a trailer, and a dump truck is provided with a rush prevention device (or an underrun protector). This rush prevention device is a device for preventing the passenger car from entering the lower part of the truck when the passenger vehicle collides. In order to perform this function, the rush prevention device is required to have a predetermined rigidity. On the other hand, from the viewpoint of environmental problems, weight reduction of the vehicle body is strongly demanded, and weight reduction of the inrush prevention device itself as a part is also demanded.

  However, in order to increase the rigidity of the intrusion prevention device, it has been necessary to take measures such as increasing the thickness of the member and increasing the cross-sectional area by installing ribs, and it has been difficult to reduce the weight. On the other hand, demands for improving the rigidity of bumpers from the safety aspect are increasing. For this reason, an intrusion prevention device is considered in which the bumper beam body is made of an aluminum shape and a reinforcing member made of an extension plate or an L-shaped reinforcing plate is inserted therein as a reinforcing material (Patent Document 1). .

  In addition, a rush preventing device has been proposed in which a reinforcing material having a high tensile open section is inserted inside a 7000 series aluminum alloy (Patent Document 2).

  Furthermore, a beam is disclosed in which an I-shaped steel reinforcing material is inserted into an aluminum shaped beam and is reinforced (Patent Document 3).

  Conventionally, in order to attach this beam to a stay provided at the front end portion or the rear end portion of the vehicle body, the beam is fixed to the stay by bolts and nuts as shown in FIGS. 5 is a plan view of the beam, FIG. 6 is a side view thereof, and FIGS. 7A to 7C are cross-sectional views showing the cross-sectional shapes of three types of beams. The beam main body 1 of the rush preventing device has a beam shape extending in the vehicle width direction, and the cross section is a hollow member having a square shape. The stay 2 fixed to the frame of the vehicle body has a plate-like shape extending from the frame to the front and the rear of the vehicle body at the front end portion and the rear end portion of the vehicle, respectively, and flanges 8 are provided at the front and rear lower end portions, respectively. Is formed. The beam 1 is fixed to each flange 8 by four bolts or nuts 3.

  As shown in FIG. 7A, the structure of the beam 1 is such that the bolt 4 has its head portion 4a disposed in the beam 1 and the screw portion 4b disposed outside the beam 1 and fixed to the beam 1. In some cases (bolt plate method), the threaded portion 4b that is exposed to the outside is inserted into the hole of the flange 8, and the nut 3 is screwed into the threaded portion 4b, whereby the beam 1 is fastened to the flange 8 of the stay 2. .

  When the structure of the beam 1 is such that the nut 5 is fixed to the inner surface of the beam 1 as shown in FIG. 7B (nut plate method), the threaded portion of the bolt 3 is inserted into the hole of the flange 8. Then, the beam 1 is fixed to the flange 8 of the stay 2 by screwing the screw portion of the bolt 3 into the nut 5.

  Further, as shown in FIG. 7C, in the case of a beam structure in which a threaded hole 6 is provided in the beam 1 and a relatively large working hole 7 is formed on the opposite surface (work) Hole method), the screw part of the bolt 3 is inserted through the hole of the flange 8 from the outside, and further inserted into the hole 6 of the beam 1, whereby the screw part of the bolt 3 entering the beam 1 is inserted. The nut inserted into the beam 1 through the hole 7 is screwed. Thereby, the beam 1 is fastened to the flange 8 by the nut inserted through the bolt 3 and the hole 7.

  However, in the case of the above-described bolt plate method and nut plate method, there are problems that the number of processing steps is large and the manufacturing cost is high. Further, in the case of the bolt plate type and the nut plate type, in order to hold the bolt head 4a or the nut 5 on the inner surface of the beam 1, it is necessary to use a plate 9 larger than the hole diameter of the bolt insertion hole. The weight will increase by that amount. Further, in the case of the bolt plate method and the nut plate method, the bolt 4 or the nut 5 is inserted into the rail provided on the inner surface of the beam 1 as shown in FIGS. 8 (a) and 8 (b). Or it is necessary to fix to the beam 1 with a rivet or the like, and the mounting operation is complicated. This increases the manufacturing cost.

  In the case of the working hole method, since the bolt 1 or the nut is not fixed to the beam 1, the work for attaching the beam 1 to the stay 2 is complicated.

  On the other hand, in order to obtain a structure in which a door beam made of aluminum or aluminum alloy is attached to a steel structure, a plurality of pierce nuts are provided on the inner surface of the first frame member made of an aluminum material having an open cross-sectional structure with a U-shaped cross section. Then, a second frame member made of aluminum material having another U-shaped open cross-sectional structure is welded to the first frame member to form a door beam having a closed cross-sectional structure, and a bolt is screwed into the pierce nut to thereby fix the door beam. The thing fixed to the vehicle body is disclosed (patent document 4). Also disclosed is an aluminum alloy extruded shape with a pierce nut, in which a pierce nut is driven into an aluminum alloy extruded shape of a main frame structure such as a side frame and a cross member, and other members can be bolted using this pierce nut. (Patent Document 5).

  In the case of this pierce nut, by driving the pierce nut onto the plate placed on the die, the plate is pierced by the pilot part of the pierce nut, and then the protrusion of the die causes the plate base material to be recessed in the pierce nut. The pierce nut is caulked to the plate by filling inside. Thereby, the pierce nut is fixed to the plate. For this reason, when a pierce nut is used, as shown in FIGS. 7A to 7C, it is not necessary to provide a bolt insertion hole or use a plate 9, reducing the number of processing steps and reducing the weight. Contribute to.

JP 2009-90796 A JP2008-24023 JP2008-189273 JP2007-269118A JP2008-223877

  Recently, even higher safety standards are required for inrush prevention devices, and at the same time, weight reduction is required from the viewpoint of environment and installation workability. Is required to do.

  However, the intrusion prevention devices disclosed in the above-mentioned Patent Documents 1 to 3 have a drawback that a necessary strength cannot be obtained, or even if the strength is obtained, the weight becomes too heavy and is difficult to put into practical use. It was. That is, in the under-run protector described in Patent Document 1, a nut plate is basically used, so that the structure may be complicated and the weight may be increased. Further, the under-run protector of Patent Document 2 has a drawback that the reinforcing member is made of steel, and the ribs of the beam are extruded as one body with the beam, which increases the weight. Furthermore, in the under-run protector of Patent Document 3, since it is necessary to provide a protrusion for guiding the reinforcing material to the mold material, the structure is complicated, and the reinforcing material is a steel material, so that there is a problem that the weight is heavy. .

  In addition, the truck entry prevention device is required to have excellent aesthetics and design in order to increase the commercial value of the truck vehicle itself. For this reason, the aluminum beam which comprises this inrush prevention apparatus is normally anodized. However, in the case of a JIS7000 beam, unevenness due to the density of alumite may occur due to the influence of recrystallization on the surface of the extruded profile. Therefore, it has been difficult to reduce the weight and improve the strength while maintaining the beauty of the truck bumper beam.

  The pierce nut method is an effective means for reducing the weight and simplifying the structure. However, a driving device necessary for driving the nut must be arranged in the beam, and the space for installing the device is limited. Therefore, there is a drawback that there is a limit to the size of the bolt diameter that can be installed. For this reason, it may be necessary to reduce the diameter of the bolts and increase the number of installations.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a vehicular intrusion prevention device having a simple structure and light weight, high strength, and excellent appearance.

  A vehicle entry prevention device according to the present invention is a beam-like vehicle entry prevention device that is attached to a stay at a front end portion or a rear end portion of a vehicle and extends in the vehicle width direction. An aluminum alloy hollow beam body that extends and has a through hole formed at a position corresponding to the stay, a base that is inserted into the beam body and contacts the inner surface of the beam body on the stay side, and an opposite side of the stay from the base A reinforcing member made of an aluminum alloy extruded shape member integrally formed with a support portion extending to the inner side surface of the beam body, and a bolt inserted and fixed at a position corresponding to the stay of the base portion and screwed to the stay. A pierced nut.

  Another vehicular intrusion prevention device according to the present invention is a beam-like vehicular intrusion prevention device that is attached to a stay at a front end portion or a rear end portion of a vehicle and extends in the vehicle width direction. A hollow beam body made of an aluminum alloy having an insertion hole formed at a position corresponding to the stay extending in the direction, a base portion inserted into the beam body and contacting the inner surface of the beam body on the stay side, and both ends of the base portion Corresponding to the stay of the base, and a reinforcing member made of an aluminum alloy extruded shape formed by integrally forming two support portions that contact the inner surface of the beam body and extend to the inner surface of the beam body opposite to the stay And a pierce nut into which a bolt for fixing to the stay is screwed.

  In these vehicular intrusion prevention devices, for example, a bolt insertion hole is formed at a position corresponding to the stay in the beam body, and the pierce nut is inserted through the bolt insertion hole and driven into the base portion. And can be configured to be fixed to the base.

  Further, for example, the beam body is a JIS 6000 series aluminum alloy, and the reinforcing member is a JIS 7000 series aluminum alloy.

  Further, the beam body is made of, for example, a hollow extruded shape, or the beam body has a cross section of two metal plates bent so as to have a U-shaped cross section by butt welding or lap welding. It is assembled in a square shape. In this case, the metal plate is, for example, a steel material or an aluminum alloy material. Alternatively, for example, the metal plate is a JIS6000 series aluminum alloy material, and the reinforcing member is a JIS7000 series aluminum alloy extruded material.

  In the present invention, after the pierce nut is attached to the base of the reinforcing member by driving the pierce nut into the base of the reinforcing member, the reinforcing member is attached to the hollow hollow beam body and the base is located on the stay side of the beam body. The beam main body and the reinforcing member can be assembled by inserting so as to contact the side surface. For this reason, when driving the pierce nut, the reinforcing member is not a closed space, and there is sufficient space around the reinforcing member, so there is no restriction on the size and shape of the driving tool. For this reason, an arbitrary number of pierce nuts of an arbitrary size can be fixed to the base, and the driving workability is good. If a large pierce nut is used, since the fixing strength per piece is high, the number of pierce nuts to be installed can also be reduced.

  Further, in the present invention, since the base of the reinforcing member is in contact with the side of the beam main body on the stay side, the reinforcing member is deformed in cooperation with the beam main body, and further, on the opposite side of the stay by the supporting portion of the reinforcing member. Since the beam side surface is supported, the collapsing of the beam at the time of collision can be reduced.

  Therefore, according to the present invention, it is possible to improve the strength of the entire intrusion prevention device and improve the workability of attachment.

  In the present invention, the beam body having a square cross section can be made of a JIS 6000 series aluminum alloy capable of anodizing, and the reinforcing material can be made of a high strength JIS 7000 series aluminum alloy. Further, it is possible to improve the strength while maintaining the aesthetic appearance of the appearance by the alumite treatment.

It is a cross-sectional view of the beam main body which shows 1st Embodiment of this invention. It is a cross-sectional view of a beam body showing a second embodiment of the present invention. It is a cross-sectional view of a beam body showing a third embodiment of the present invention. It is sectional drawing which shows the attaching part of a pierce nut. It is a top view which shows the structure of the conventional rush prevention apparatus. It is a side view of the conventional rush prevention apparatus similarly. It is a cross-sectional view which similarly shows the cross-sectional shape of the beam main body of the conventional rush prevention apparatus.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a beam body of a truck entry preventing apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the beam body 10 of the present embodiment has a hollow shape with a vertically long transverse cross section and a beam shape extending in the width direction of the vehicle body, as in FIG. 5. The beam body 10 is, for example, a JIS6000-based extruded shape member. The beam body 10 has a vertical side surface that is approximately twice as long as a horizontal side surface. The vertical side surface of the beam body 10, that is, the stay side surface fixed to the frame of the vehicle body, Two bolt insertion holes 11 are formed. This bolt insertion hole 11 is for inserting the bolt 3 shown in FIG. 5, and is formed at the beam body side surface position corresponding to this stay 2. As shown in FIGS. 5 and 6, when the beam main body 10 is fixed with four bolts 3 between one stay 2, the bolt insertion holes 11 shown in FIG. There are actually four (the remaining two are formed at the back or front of the page).

  The reinforcing member 20 includes a base portion 21 in contact with the inner side surface on the stay side of the beam main body 10, a support portion 22 extending from the center of the base portion 21 to an inner side surface on the opposite side of the stay of the beam main body 10, and the support portion 22 The flange 23 is provided at the tip and is in contact with the inner surface opposite to the stay of the beam main body 10, and the two ends 24 bent from both ends of the base 21 and slightly overlap the lateral side surface of the beam main body 10. The base portion 21, the support portion 22, the flange 23, and the end portion 24 are integrally formed by extrusion molding. The reinforcing member 20 is a JIS 7000 series aluminum alloy.

  A pierce nut 30 is fixed to the base 21 at a position aligned with the bolt insertion hole 11 of the beam body 10. As shown in FIG. 4, the pierce nut 30 is driven into the base 21 from the inner surface side and fixed to the base 21. The pierce nut 30 has a screw hole 31 formed in the center thereof, and a stay fixing bolt 3 (see FIG. 5) is screwed into the screw hole 31. The pierce nut 30 is fixed by placing the base portion 21 of the reinforcing member 20 on the die and driving the pilot portion of the pierce nut 30 into the base portion 21 from above with a press. That is, when the base portion 21 is perforated by the pilot portion of the pierce nut and the pierce nut is further pressed, the protrusion portion of the die fills the base material 32 of the base portion 21 into the concave portion of the pierce nut 30 and the pierce nut 30 becomes the base portion 21. It is caulked.

  The piercing nut 30 is attached by the reinforcing member 20 having an open shape, and there is sufficient space above the die, so that workability is good and the piercing nut 30 is relatively large. Can be used, and the number of piercing nuts to be attached can be arbitrarily determined. When a large pierce nut 30 is used, the fixing strength of one pierce nut is high, so the required number of pierce nuts can be reduced. The pierce nut 30 is made of, for example, steel or aluminum or an aluminum alloy. When the pierce nut 30 is used, it is not necessary to form a rail having a complicated shape as shown in FIGS. 7A and 7B on the inner surface of the beam body having a closed cross section. It is good and the cost can be reduced.

  As described above, after fixing the pierce nut 30 to the reinforcing member 20, the reinforcing member 20 is slid in the axial direction of the hollow beam main body 10 and inserted to thereby arrange the reinforcing member 20 in the beam main body 10. To do. As a result, the base 21 is superimposed on the inner surface on the vehicle body side in the beam body 10, and the reinforcing member 20 that supports the inner surface on the side opposite to the vehicle body with the support portion 22 and the flange 23 can be disposed. The hollow beam body 10 is reinforced by the base portion 21 and the support portion 22.

  Then, the intrusion prevention device of the present embodiment can be attached to the stay 2 by inserting the beam body 10 through the bolt insertion hole 11 through the bolt 3 of the stay 2 and screwing into the screw hole 31 of the pierce nut 30. .

  Since the beam body 10 and the reinforcing member 20 are extruded shapes of aluminum alloy, they can be formed into a highly accurate shape, and can be inserted and assembled with high accuracy. The reinforcing member 20 has a substantially T shape and has an open cross-sectional structure. For this reason, depending on the diameter of the pierce nut 30, it is possible to increase the number of support portions 22 to two or more instead of one, and to support the beam inner surface on the vehicle front end side with the plurality of support portions 22. .

  Moreover, since there is no restriction | limiting of a magnitude | size in the apparatus which drives a pierce nut, the pierce nut for large diameter bolt mounting | wearing can be driven. Furthermore, in the present embodiment, since the flange 23 and the end portion 24 are formed, the positioning of the reinforcing member 20 within the hollow beam main body 10 is easy, and the reinforcing member 20 can be positioned with high accuracy. Since the flange 23 and the end 24 follow the inner surface of the beam body 10 as described above, the reinforcing member 20 deforms following the deformation of the beam body 10 at the time of collision with high accuracy. As a result, a high-strength truck entry prevention device can be obtained.

  The beam body 10 and the aluminum alloy of the reinforcing member 20 can be appropriately selected according to the required strength. However, by making the beam body 10 a JIS6000 series aluminum alloy and the reinforcing member 20 a JIS7000 series aluminum alloy, Appearance can be improved while improving strength. That is, in order to improve the appearance, the beam body 10 needs to be anodized, but the JIS 6000 series aluminum alloy has good anodized properties and can give a predetermined strength. In this case, it is preferable that the JIS6000 series aluminum alloy is tempered at T6 and the JIS7000 series aluminum alloy of the reinforcing member 20 is tempered at T7.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the shape of the reinforcing member 20 is different from that of the first embodiment. The reinforcing member 20 according to the second embodiment includes a base portion 25 in contact with the inner side surface of the beam body 10 on the stay side, and both upper and lower horizontal inner surface surfaces of the beam body 10 from both ends of the base portion 25. 10, two support portions 26 that extend to the inner surface on the opposite side of the stay, and end portions 27 that slightly overlap the inner surface on the opposite side of the stay of the beam body 10 at the end portions of the support portions 26. . This reinforcing member 20 is also integrally formed by extrusion molding. The reinforcing member 20 is also preferably formed of a JIS7000 high-strength aluminum alloy.

  The inrush prevention device of this embodiment also has the same effect as that of the first embodiment.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the hollow beam body 10 is different from that of the first embodiment, and the reinforcing member 20 is the same as that of the first embodiment. The beam main body 10 of the present embodiment has two metal plates 12 and 13 bent in a U-shape joined at both ends thereof by butt welding or lap welding (joining portion 14), and the cross section becomes a B shape. It is integrated. In the present embodiment, first, the reinforcing member 20 is disposed on the inner surface of the metal plate 12 bent in a U-shape, so that the positioning of the reinforcing member 20 with respect to the metal plate 12 is easy and the positioning can be performed with high accuracy. . In addition, the reinforcing member 20 can be used to position and support the metal plate 13 disposed on the upper side with respect to the metal plate 12 disposed on the lower side in the subsequent welding process.

Although the welding method can also be arc welding, since the target material is generally thin, it is preferable to use laser welding such as YAG, CO ₂ , or fiber, or friction stir welding (FSW).

  In addition, since the support part 22 is separated from the weld joint part 14 at the time of welding, the support part 22 does not receive the heat influence of welding. For this reason, the reinforcing member 20 can maintain high strength.

  The beam body 10 may be an aluminum alloy or a steel material. In the case of steel, it is preferable to use a high-tensile steel plate.

  The inrush prevention device of this embodiment has the same effects as those of the first and second embodiments.

2: Stay 3: Bolt 10: Beam body 11: Bolt insertion hole 12, 13: Metal plate 20: Reinforcement member 21: Base portion 22: Support portion 23: Flange 24, 27: End portion 30: Pierce nut

Claims (8)

In a beam-like vehicular intrusion prevention device that is attached to a stay at a front end portion or a rear end portion of a vehicle and extends in the vehicle width direction, an insertion hole is formed at a position corresponding to the stay extending in the vehicle width direction with a transverse cross section. A formed aluminum alloy hollow beam main body, a base inserted into the beam main body and in contact with the inner surface of the beam main body on the stay side, and a support portion extending from the base to the inner surface of the beam main body on the opposite side of the stay A reinforcing member made of an aluminum alloy extruded shape, and a pierce nut that is inserted and fixed at a position corresponding to the stay of the base and is screwed with a bolt to be attached to the stay. A vehicle entry prevention device. In a beam-like vehicular intrusion prevention device that is attached to a stay at a front end portion or a rear end portion of a vehicle and extends in the vehicle width direction, an insertion hole is formed at a position corresponding to the stay extending in the vehicle width direction with a transverse cross section. A formed hollow beam body made of an aluminum alloy, a base that is inserted into the beam body and contacts the inner surface of the beam body on the stay side, and an opposite side of the stay that contacts the inner surface of the beam body from both ends of the base A reinforcing member made of an aluminum alloy extruded member integrally formed with two support portions extending to the inner surface of the beam main body, and inserted and fixed at a position corresponding to the stay of the beam main body and the base portion. And a pierce nut to which a bolt for mounting is screwed. A bolt insertion hole is formed at a position corresponding to the stay in the beam body, and the pierce nut is inserted into the bolt insertion hole, driven into the base portion, and fixed to the base portion. The vehicle entry prevention device according to claim 1 or 2. 4. The vehicular intrusion prevention device according to claim 1, wherein the beam body is a JIS 6000 series aluminum alloy, and the reinforcing member is a JIS 7000 series aluminum alloy. 5. The vehicular rush preventing device according to any one of claims 1 to 4, wherein the beam main body is made of a hollow extruded profile. 5. The beam body according to any one of claims 1 to 4, wherein two metal plates bent so as to have a U-shaped cross section are assembled into a square shape by butt welding or lap welding. The vehicle entry prevention device according to claim 1. The intrusion prevention device for a vehicle according to claim 6, wherein the metal plate is a steel material or an aluminum alloy material. 8. The vehicle intrusion prevention device according to claim 7, wherein the metal plate is a JIS 6000 series aluminum alloy material, and the reinforcing member is a JIS 7000 series aluminum alloy extruded material.

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