JP2005306161A - Bumper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bumper device consisting of a main bumper beam and an auxiliary bumper beam whose positional relationship is maintained in the event of collision with a person, structured so that the auxiliary bumper beam does not hinder the main bumper beam to make displacement in the event of collision with a property and no impact is transmitted to the vehicle or driver/passenger(s). <P>SOLUTION: The bumper device 1 to scoop up a pedestrian onto the bonnet of the vehicle in the event of collision with a person is structured so that an auxiliary bumper consisting of the auxiliary bumper beam 11 furnished at its front face with a shock absorbing member 12 is installed in a specified positional relationship to a main bumper consisting of the main bumper beam 13 furnished at its front face with a shock absorbing member 14, wherein the main bumper beam 13 is supported by a shock absorbing device 15 on a side member 51, while the auxiliary bumper beam 11 is coupled with the main bumper beam 13 by a supporting arm 16 sunk from the main bumper beam 13, and the supporting arm 16 has a rigidity so as not to make plastic deformation in the event of collision with person and make plastic deformation in the event of collision with property. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, an auxiliary bumper consisting of an auxiliary bumper beam provided with a shock absorbing member on the front surface is attached to a main bumper consisting of a main bumper beam provided with a shock absorbing member on the front surface in a predetermined positional relationship. The present invention relates to a bumper device that scoops a pedestrian onto a vehicle hood.

  For convenience of explanation, in this specification, a case where the main bumper or the auxiliary bumper collides with a pedestrian is called “personal collision”, and a case where the main bumper or the auxiliary bumper collides with a wall surface or another vehicle is called “objective collision”.

  Further, in the present specification, the vehicle members include left and right side members that extend in the front-rear direction of the vehicle, and cross members that extend from the side members and extend in the left-right direction of the vehicle.

  A bumper device that has an auxiliary bumper attached to the main bumper in a predetermined positional relationship, in an interpersonal collision, scoop the pedestrian's feet that collided as much as possible on the bonnet so as not to place a burden on the joints, and walk as much as possible. It has a function not to injure the person. In such a bumper device, it is sufficient that the auxiliary bumper with respect to the main bumper is in a predetermined positional relationship. For example, when the main bumper is composed of the main bumper beam alone and the auxiliary bumper is composed of the auxiliary bumper beam alone, the main bumper beam and the auxiliary bumper beam are in the above positional relationship. To do. When providing an impact absorbing member on the front surface of the main bumper beam and providing an impact absorbing member on the front surface of the auxiliary bumper beam, the main bumper and the auxiliary bumper including each impact absorbing member are usually in the above-described positional relationship.

  The bumper device of Patent Document 1 supports a main bumper beam (bumper reinforcement) with a bumper stay (bumper bracket) protruding forward from the front end of a side member (front side frame), and downward from the vicinity of the front end of the side member. The auxiliary bumper beam (front cross member) is supported by the lowered bracket, and a protruding member attached to the front surface of the auxiliary bumper beam is protruded forward from an impact absorbing member (energy absorbing member) attached to the front surface of the main bumper beam.

  The bumper device of Patent Document 2 supports a main bumper beam (bumper base) at a front end of a side member (front side frame), and an auxiliary bumper beam (hollow member) by a support bracket lowered downward from the vicinity of the front end of the side member (front side frame). The auxiliary bumper beam is positioned below the shock absorbing member (shock absorber) attached to the front surface of the main bumper beam.

  The bumper device of Patent Document 3 supports a main bumper beam (bumper reinforcement) at a front end of a side member (front side frame), and an auxiliary bumper beam (a projecting member, for example, a bracket) lowered from the main bumper beam downward and forward. The auxiliary bumper beam protrudes forward from an impact absorbing member (impact absorber) attached to the front surface of the main bumper beam.

  The bumper device of Patent Document 4 supports a main bumper beam (upper bumper beam) at the front end of a side member (side beam), and supports an auxiliary bumper beam (lower bumper beam) with a stay lowered downward from the main bumper beam. . In this prior art, attention is paid to the positional relationship between the upper impact absorbing member attached to the front surface of the main bumper beam and the lower impact absorbing member attached to the front surface of the auxiliary bumper beam.

  The bumper device of Patent Document 5 extends a support member (Distanzkonsolen) forward from a plate surface (Anschlagplatten) attached to the front end of a side member (Langstagern), and supports the main bumper beam (Quertrager) with this support member. A support member (Distanzstreben) is lowered downward and forward, and an auxiliary bumper beam (Querholm) is supported by the support member. The main bumper beam and the auxiliary bumper beam are substantially in the same position in the front-rear direction. The bumper device of Patent Document 6 has a substantially similar configuration.

  The bumper device of Patent Document 7 extends a main shock absorber (Crashbox) forward from a plate surface (Stutzplatte) attached to the front end of a side member (Langstagern), and an auxiliary shock absorber (integrated with the main shock absorber) ( Crashbox) extends forward from below the main shock absorber. The positional relationship between the front ends of the main impact absorbing device and the auxiliary impact absorbing device corresponds to the positional relationship between the main bumper beam and the auxiliary bumper beam, and has a function of scooping up pedestrians.

  In addition, as seen in Patent Document 8, a bumper device in which an auxiliary bumper beam (d'impact) is directly attached to the bumper cover apart from the main bumper beam and the vehicle member is also seen. Usually, since the main bumper beam is separated from the bumper cover, the auxiliary bumper beam is in a positional relationship protruding forward and downward with respect to the main bumper beam.

Japanese Unexamined Patent Publication No. 2001-071837 (7 pages, FIG. 1 and FIG. 2) JP 2002-205613 A (pages 3 and 4, FIGS. 3 and 6) Japanese Patent Laid-Open No. 2001-039242 (pages 3 and 4, FIGS. 1 and 3) JP 2004-058726 A (pages 3 and 4; FIGS. 3 and 6) German Patent Application Publication No. 19912272 (pages 3-6, FIGS. 1-3) German Patent Application Publication No. 19956561 (pages 3 to 4, FIGS. 1 to 3) German Patent Application No. 10154113 (page 3, FIGS. 1 and 2) European Patent Application No. 1314614 (pages 2-5, FIGS. 1-4)

  Bumper devices that scoop up pedestrians during interpersonal collisions must maintain the positional relationship between the auxiliary bumper beam and main bumper beam during interpersonal collisions, but must prevent the auxiliary bumper beam from interfering with the displacement of the main bumper beam during objective collisions . In this respect, in the bumper devices of Patent Document 1 and Patent Document 2, the auxiliary bumper beam is directly supported by the side member, so that the main bumper beam can be displaced regardless of the auxiliary bumper beam. However, if they are displaced independently of each other, the displacement of the auxiliary bumper beam may hinder the displacement of the main bumper beam. In addition, since the auxiliary bumper beam is directly supported by the side member, the impact applied to the auxiliary bumper beam is directly transmitted to the side member, causing the side member to be deformed and inhibiting the normal energy absorption of the shock absorber. There are also problems that affect vehicles or passengers.

  Since the bumper devices of Patent Literature 3 and Patent Literature 4 support the auxiliary bumper beam with respect to the main bumper beam, the auxiliary bumper beam is also displaced according to the displacement of the main bumper beam, and the displacement of the auxiliary bumper beam inhibits the displacement of the main bumper beam. There is no fear of doing so. However, like the bumper devices of Patent Document 1 and Patent Document 2, the impact applied to the auxiliary bumper beam is directly transmitted to the side member, and the problem of affecting the vehicle or the occupant is not improved. In this regard, in the bumper device of Patent Document 3, an example in which the auxiliary bumper beam is supported via the shock absorbing device is presented, but this shock absorbing device is dedicated to the auxiliary bumper beam, and the relationship with the displacement of the main bumper beam. Therefore, there is a problem that it is difficult to set operation or non-operation.

  In the bumper devices of Patent Document 5 and Patent Document 6, since the main bumper beam and the auxiliary bumper beam are supported by the side members via the same plate surface, it is expected that the auxiliary bumper beam is displaced in accordance with the displacement of the main bumper beam. . However, except for the impact absorbing member provided in front of each bumper beam, the auxiliary bumper beam protrudes forward from the main bumper beam, so the impact applied to the auxiliary bumper beam is first transmitted to the side members via the plate surface, and the vehicle Or problems that affect passengers remain.

  The bumper device of Patent Document 7 is composed of impact absorbing devices corresponding to the main bumper beam and the auxiliary bumper beam, respectively, and even if an impact is applied to only one of them, the side member does not affect the vehicle or the occupant. it is conceivable that. However, since the shock absorbing devices corresponding to the main bumper beam and the auxiliary bumper beam do not operate in conjunction with each other, the operation of the shock absorbing device equivalent to the auxiliary bumper beam may hinder the operation of the shock absorbing device equivalent to the main bumper beam. is there.

  In the bumper device of Patent Document 8, the main bumper beam and the auxiliary bumper beam are completely separated from each other, and the auxiliary bumper beam is attached to the bumper cover, so that the impact applied to the auxiliary bumper beam may affect the vehicle or the occupant. However, there is a possibility that the displacement of the auxiliary bumper beam hinders the displacement of the main bumper beam. In this way, each bumper device can scoop up pedestrians during interpersonal collisions, but the problems associated with objective collisions have not been solved. Therefore, a bumper device is developed that maintains the positional relationship between the main bumper beam and the auxiliary bumper beam during interpersonal collisions, and that the auxiliary bumper beam does not interfere with the displacement of the main bumper beam during objective collisions, and that does not transmit excessive impact to the vehicle or the occupant. Therefore, we examined.

  What was developed as a result of the study was that an auxiliary bumper consisting of an auxiliary bumper beam with a shock absorbing member on the front surface was attached to the main bumper with a shock absorbing member on the front surface in a predetermined positional relationship. In a bumper device that scoops up a pedestrian on the vehicle bonnet during a person-to-person collision, the main bumper beam is supported by a shock absorbing device with respect to the vehicle member, and the auxiliary bumper beam is connected to the main bumper beam by a support arm lowered from the main bumper beam. The support arm is a bumper device that does not undergo plastic deformation during an interpersonal collision and has a rigidity that undergoes plastic deformation during an objective collision. The impact absorbing device may be a type that absorbs an impact by degeneration of a cylinder or a type that absorbs an impact by plastic deformation.

  Here, “rigidity that does not plastically deform during an interpersonal collision but plastically deforms during an object collision” means that even if elastic deformation is allowed when a load set on the assumption of interpersonal collision is applied to the support arm from the auxiliary bumper This means that the support arm has a structural strength that is plastically deformed when a load set on the assumption of objective collision is applied from the auxiliary bumper to the support arm without deformation. For example, if the maximum load applied from the auxiliary bumper to the support arm in an interpersonal collision is about 2940 N (= 300 kgf), the load applied from the auxiliary bumper to the support arm in an objective collision can be suppressed to about 4900 N (= 500 kgf). For example, the support arm may have a structural strength that does not plastically deform or allows only elastic deformation until the load of about 2940 N or less, and that allows plastic deformation if the load is about 4900 N or more. This structural strength is required for each support arm.

  The bumper device according to the present invention absorbs the impact applied to the main bumper beam or the auxiliary bumper beam by an impact absorbing member provided in front of the main bumper beam or the auxiliary bumper beam in the case of an interpersonal collision, and the main bumper beam and the auxiliary bumper beam have a predetermined positional relationship. maintain. In the bumper device of the present invention, the impact applied to the main bumper beam at the time of the object collision is directly transmitted from the main bumper beam to the impact absorbing device and absorbed by the deformation of the impact absorbing device, and the impact applied to the auxiliary bumper beam. Is indirectly transmitted from the support arm to the shock absorbing device via the main bumper beam and absorbed by the deformation of the shock absorbing device, and the main bumper beam and the auxiliary bumper beam are displaced together according to the deformation of the shock absorbing device.

  The auxiliary bumper beam is preferably connected to the main bumper beam by a support arm that is lowered from or near the support portion of the main bumper beam by the shock absorber. The support arm is provided at or near the support portion of the main bumper beam by the shock absorber, so that the impact transmitted from the auxiliary bumper beam through the support arm is transmitted to the shock absorber without deforming the main bumper beam. become. It is preferable that the support arm is directly lowered from the support portion of the main bumper beam by the shock absorbing device. However, in practice, the support arm may be configured to attach the support arm to the back surface of the main bumper beam adjacent to the support portion of the main bumper beam by the shock absorbing device. .

  Further, the auxiliary bumper beam may be connected to the main bumper beam by a support arm that extends from the end of the auxiliary bumper beam and wraps around the rear of the vehicle. The support arm may be used in combination with the support arm attached to the back surface of the main bumper beam. In this case, the end of the auxiliary bumper beam, which is supported in a cantilevered manner from the support arm attached to the back of the main bumper beam, is bent from the support arm attached to the back of the main bumper beam. Avoid bending.

  The support arm may be composed of a metal pipe having a circular cross section. A support arm made of a metal pipe having a circular cross-section has a higher rigidity than a bracket made of a metal plate. In addition, the support arm may be configured by a metal pipe having a circular cross section that is bent or curved in the front-rear direction of the vehicle, so that the positional relationship of the auxiliary bumper beam with respect to the main bumper beam in the front-rear direction of the vehicle is set. Specifically, the support arm is preferably substantially crank-shaped bent or curved twice in different directions.

  The impact absorbing member provided on the front surface of the main bumper beam may be formed from a resin molded product. The impact absorbing member provided on the front surface of the auxiliary bumper beam may be formed of a resin molded product or a sheet metal molded product. Each of the resin molded products is preferably a foamed resin molded product that fills the space between the bumper cover located in front of the main bumper beam or the auxiliary bumper beam and the front surface of the main bumper beam or the auxiliary bumper beam. Further, the sheet metal molded product is preferably a hollow cross-section C-type attached to the front surface of the auxiliary bumper beam, and a stepped portion that facilitates bending may be provided on the upper or lower surface of the cross-section C-type. Here, the impact absorbing member provided on the front surface of the auxiliary bumper beam may be composed of a plurality of impact absorbing members divided in the extending direction of the auxiliary bumper beam.

  The bumper device according to the present invention has an effect of achieving a main purpose of preventing a pedestrian from being injured as much as possible by scooping up a pedestrian on a hood of a vehicle while maintaining a predetermined positional relationship between a main bumper beam and an auxiliary bumper beam at the time of an interpersonal collision. In the bumper device of the present invention, the main bumper beam and the auxiliary bumper beam do not disturb each other's displacement at the time of an object collision, and any impact applied to the bumper device can be absorbed by the deformation of the impact absorbing device, so that the impact is transmitted to the vehicle or the occupant. It has the main effect of not causing the fear.

  The main effect can be obtained by connecting the auxiliary bumper beam to the main bumper beam by a support arm lowered from or near the support portion of the main bumper beam by the shock absorber. In addition, by connecting the auxiliary bumper beam to the main bumper beam by a support arm that extends from the end of the auxiliary bumper beam and wraps around the rear of the vehicle, bending of the end of the auxiliary bumper beam is prevented, and the pedestrian is picked up by the auxiliary bumper beam. Can be sure.

  In interpersonal collision, maintaining the positional relationship of the auxiliary bumper beam with respect to the main bumper beam largely depends on the rigidity of the support arm. In the present invention, the support arm is formed of a metal pipe having a circular cross section, preferably a metal pipe having a circular cross section that is bent or curved in the front-rear direction of the vehicle, thereby obtaining a support arm having a required rigidity while being lightweight. It has an effect that can be.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of an example of a bumper device 1 according to the present invention as viewed from the front, FIG. 2 is a perspective view of the bumper device 1 as viewed from the back, and FIG. 3 is a schematic cross-sectional view of the bumper device 1. 4 is a partially enlarged sectional view of the auxiliary bumper in FIG. 3, FIG. 5 is a perspective view corresponding to FIG. 1 showing another example of the bumper device 2 of the present invention, and FIG. 6 is a sectional view of the bumper device 3 using the auxiliary bumper of another example. 7 is a partially enlarged sectional view of the auxiliary bumper in FIG. 6, FIG. 8 is a sectional view of the bumper device 4 using another example of the auxiliary bumper, FIG. 9 is a partially enlarged sectional view of the auxiliary bumper in FIG. FIG. 11 is a cross-sectional view corresponding to FIG. 3 of the bumper device 1 during a personal collision, and FIG. 11 is a cross-sectional view corresponding to FIG. 3 of the bumper device 1 during an object collision.

  As shown in FIGS. 1 and 2, the bumper device 1 of this example supports both ends of the main bumper beam 13 with shock absorbers 15, 15, and is located behind the main bumper beam 13 and just inside the shock absorber 15. A pair of left and right support arms 16 are lowered, and an auxiliary bumper beam 11 is installed on the support arms 16 and 16. In the bumper device 1 of this example, the impact absorbing device 15 that absorbs the impact by crushing the metal box is used, but in addition to the impact absorbing device that absorbs the impact by degeneration of the cylinder, a multistage metal You may use the impact-absorbing apparatus which absorbs an impact by the plastic deformation which pushes the front | former stage of a pipe making body into a back | latter stage. The main bumper beam 13 or the auxiliary bumper beam 11 is bent with the same or different curvature radius according to the vehicle body design. In addition, the main bumper beam 13 or the auxiliary bumper beam 11 is appropriately attached with a bracket 17 having other functional parts as a mounting base.

  As shown in FIG. 3, the bumper device 1 has a mounting plate 18 attached to the rear end of the shock absorbing device 15 in contact with a receiving plate 52 provided at the front end of the side member 51. The members 52 are fastened to each other with bolts (not shown) and attached to the side member 51 in a replaceable manner. The main bumper beam 13 constitutes a main bumper by attaching an impact absorbing member 14 made of a foamed resin molded product to the front surface. Further, the auxiliary bumper beam 11 is configured by attaching an impact absorbing member 12 made of a sheet metal molded product having a C-shaped cross section to the front surface to constitute an auxiliary bumper. The bumper cover 53 is in close contact with the impact absorbing member 14 attached to the main bumper beam 13 and is away from the impact absorbing member 12 attached to the auxiliary bumper beam 11 to cover the entire bumper device 1. In FIG. 3, an intermediate gap between the bumper cover 53 is an air intake 54.

  As is apparent from FIGS. 1 and 2, the auxiliary bumper beam 11 is composed of three members, a left end beam 111, an intermediate beam 112, and a right end beam 113, with the support arm 16 as a boundary. The impact absorbing member 12 attached to the front surface of the auxiliary bumper beam 11 is also divided into three members corresponding to the beams 111, 112, and 113, a left end member 121, an intermediate member 122, and a right end member 123. As described above, the auxiliary bumper beam 11 and the shock absorbing member 12 are configured from the plurality of divided beams 111, 112, 113 or the members 121, 122, 123, thereby facilitating the positioning of the assembly, and the design or manufacture of each of the beams 111, 112, 113 or the members 121, 122, 123 is facilitated. make it easier.

  The support arm 16 is formed by bending a metal pipe having a circular cross section twice in the front-rear direction to form a substantially crank shape. The bend number, bend angle, etc. of the metal pipe may be determined by the positional relationship of the auxiliary bumper beam 11 with respect to the main bumper beam 13, and is not directly related to the rigidity required for the support arm 16. The rigidity of the support arm 16 is determined by the cross-sectional shape of the member, the material used, and the thickness. For example, the maximum load applied from the auxiliary bumper beam 11 to the support arm 16 in the interpersonal collision is about 2940 N (= 300 kgf), and the load applied from the auxiliary bumper beam 11 to the support arm 16 in the objective collision is suppressed to about 4900 N (= 500 kgf). Then, the support arm 16 having a circular cross section having an outer diameter of 22.2 to 31.8 mm is formed by using a steel plate having a thickness of 1.6 to 3.6 mm. In order to reduce the weight, a high-strength steel plate having a thickness of 1.2 to 2.0 mm is used to form the support arm 16 having a circular cross section with an outer diameter in the range of 19.1 to 25.4 mm.

  As shown in FIG. 4, the auxiliary bumper beam 11 of this example is a sheet metal molded product having a C-shaped cross section that is fixed to the front surface of the support arm 16. The shock absorbing member 12 of the molded product is attached so as to be covered. The auxiliary bumper beam 11 is preferably composed of a plain steel plate or a high-tensile steel plate having a thickness of 1.0 to 2.6 mm. In this example, since the auxiliary bumper beam 11 and the shock absorbing member 12 are both made of metal, the shock absorbing member 12 can be fixed to the auxiliary bumper beam 11 by spot welding or the like. The shock absorbing member 12 made of a sheet metal molded product has a frontal cross-sectional shape in which the vertical width of the front surface 125 is narrower than the vertical distance of the hems 124, 124, and is composed of a normal steel plate or a high-tensile steel plate with a thickness of 0.5 to 1.0 mm. By doing so, a certain structural strength is exhibited. The impact absorbing member 12 is plastically deformed by bending the upper surface 126 or the lower surface 127, and absorbs a certain amount of impact. From this, the impact absorbing performance can be adjusted by changing the ratio of the vertical distance between the hems 124, 124 and the vertical width of the front surface 125, or by providing the upper surface 126 or the lower surface 127 with a stepped portion that promotes bending.

  Two support arms 16 may be used as a pair of left and right as in this example, but the number of support arms 16 may be increased in order to strengthen the support of the auxiliary bumper beam 11. In this case, for example, as shown in FIG. 5, the bumper device 2 configured to connect the support arms 21 extending from both ends of the auxiliary bumper beam 11 and wound around the rear of the vehicle to both ends of the main bumper beam 13 can be shown. . In this example, in order to strengthen the connection of the auxiliary bumper beam 11 to the inner support arm 16 shown in the example of FIG. 1, a cover 22 protrudes from the auxiliary bumper beam 11 and is fixed to the support arm 16. .

  The impact absorbing member provided on the front surface of the auxiliary bumper beam may be a resin molded product in addition to a sheet metal molded product. The shock absorbing member 31 of the bumper device 3 shown in FIGS. 6 and 7 has a sectional structure in which a hollow box-shaped main body 33 is mounted on a mounting surface 32 that contacts the front surface of the auxiliary bumper beam 11. 11, the upper edge 34 and the lower edge 35 of the mounting surface 32 are fixed by riveting. The shock absorbing member 31 can be configured as an integrally molded product having a plate thickness of 1.0 to 3.0 mm using PP, PE or the like. The box-shaped main body 33 has a notch surface 39 formed between the front surface 36 and the upper surface 37 or the lower surface 38 so that the front surface 36 is not displaced in the vertical direction and is retracted while the upper surface 37 and the lower surface 38 are crushed. Yes. Further, the shock absorbing member 41 of the bumper device 4 shown in FIGS. 8 and 9 has a structure in which mounting edges 43 and 43 are protruded vertically from the bottom of the C-shaped main body 42, and the auxiliary bumper beam 11 has the above-mentioned structure. Fix the mounting edges 43, 43 by riveting. The C-shaped main body 42 has a notched surface 47 formed between the front surface 44 and the upper surface 45 or the lower surface 46 so that the front surface 44 does not shift in the vertical direction and retreats while the upper surface 45 and the lower surface 46 are crushed. Yes. The shock absorbing members 31 and 41 made of these resin molded products can adjust the shock absorbing characteristics by changing the cross-sectional shape.

  The operation of the main bumper beam 13 and the auxiliary bumper beam 11 in the interpersonal collision and the objective collision in the bumper device 1 shown in FIG. First, as shown in FIG. 10, in the case of a person-to-person collision, the shock absorbing device 15 basically does not work, and the shock is absorbed by the shock absorbing members 14 and 12 provided in front of the main bumper beam 13 or the auxiliary bumper beam 11. To do. At this time, since the support arm 16 is not plastically deformed by the load applied from the auxiliary bumper beam 11 to the support arm 16, specifically, it does not bend, the main bumper beam 13 and the auxiliary bumper beam 11 can maintain the positional relationship as designed. As a result, the main bumper beam 13 hits the pedestrian's thigh 61 to the vicinity of the knee 62, and the auxiliary bumper beam 11 hits the knee 62 to the lower leg 63, thereby scooping up the pedestrian.

  Next, at the time of the objective collision, as shown in FIG. 11, the impact absorbing device 15 is plastically deformed by the impact transmitted from the main bumper beam 13 and the auxiliary bumper beam 11 colliding with the wall surface 64, and absorbs the impact. Therefore, it is possible to prevent transmission of an impact to the vehicle body or the occupant. Further, since the support arm 16 has only rigidity to be plastically deformed by an object collision, the auxiliary bumper beam 11 protruding forward from the main bumper beam 13 in order to scoop up a pedestrian during an interpersonal collision is Retreats due to deformation and does not impede the action of shock absorption or transmission by the main bumper beam 13. Thereby, the impact can be reliably absorbed by the impact absorbing device 15.

It is the perspective view which looked at an example of the bumper device of the present invention from the front. It is the perspective view which looked at the bumper device from the back direction. It is sectional drawing of the schematic bumper apparatus. FIG. 4 is a partial enlarged cross-sectional view of an auxiliary bumper in FIG. 3. It is a perspective view equivalent to FIG. 1 showing another example of the bumper device of the present invention. It is sectional drawing of the bumper apparatus using the auxiliary bumper of another example. It is a partial expanded sectional view of the auxiliary bumper in FIG. It is sectional drawing of the bumper apparatus using the auxiliary bumper of another example. It is a partial expanded sectional view of the auxiliary bumper in FIG. FIG. 4 is a cross-sectional view corresponding to FIG. 3 of the bumper device during a person-to-person collision. FIG. 4 is a cross-sectional view corresponding to FIG. 3 of the bumper device during an object collision.

Explanation of symbols

1 Bumper device
11 Auxiliary bumper beam
12 Shock absorber made of sheet metal molded product
13 Main bumper beam
14 Shock-absorbing members made of foamed resin molded products
15 Shock absorber
16 Support arm 2 Bumper device as another example
21 Support arm 3 Bumper device as another example
31 Shock absorbing member 4 Bumper device as another example
41 Shock absorber
51 Side member
53 Bumper cover

Claims (9)

By attaching an auxiliary bumper made of an auxiliary bumper beam with a shock absorbing member on the front surface to the main bumper made of a main bumper beam with a shock absorbing member on the front surface in a predetermined positional relationship, The main bumper beam is supported by a shock absorber for the vehicle member, and the auxiliary bumper beam is connected to the main bumper beam by a support arm lowered from the main bumper beam. A bumper device characterized by having a rigidity that is not deformed and plastically deforms upon an object collision. 2. The bumper device according to claim 1, wherein the auxiliary bumper beam is connected to the main bumper beam by a support arm lowered from or near the support portion of the main bumper beam by the shock absorber. The bumper device according to claim 1, wherein the auxiliary bumper beam is connected to the main bumper beam by a support arm that extends from an end of the auxiliary bumper beam and wraps around the rear of the vehicle. The bumper device according to claim 1, wherein the support arm is made of a metal pipe having a circular cross section. The bumper device according to claim 1, wherein the support arm is formed of a metal pipe having a circular cross section that is bent or curved in a longitudinal direction of the vehicle. The bumper device according to claim 1, wherein the impact absorbing member provided on the front surface of the main bumper beam is made of a resin molded product. 2. The bumper device according to claim 1, wherein the impact absorbing member provided on the front surface of the auxiliary bumper beam is made of a resin molded product. The bumper device according to claim 1, wherein the impact absorbing member provided on the front surface of the auxiliary bumper beam is a sheet metal molded product. 2. The bumper device according to claim 1, wherein the impact absorbing member provided on the front surface of the auxiliary bumper beam comprises a plurality of impact absorbing members divided in the extending direction of the auxiliary bumper beam.

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