JP5083031B2 - Deployment structure and shock absorber - Google Patents

Description

  The present invention relates to a deployment structure and an impact absorbing device, and in particular, a deployment structure that can be deployed in a three-dimensional manner from a plane, an impact absorbing device that deploys the deployment structure at the collision position and absorbs the impact caused by the collision, About.

  Conventionally, in a collision safety structure for a vehicle, collision energy is absorbed by deformation of a component of the vehicle, and an impact force to the vehicle and an occupant is reduced. For example, in the case of a frontal collision, the front body breaks at the time of the collision and absorbs the collision energy, and the impact force on the occupant is alleviated. For this reason, various structures for efficiently absorbing collision energy have been proposed for vehicle components (Patent Document 1).

  For example, Patent Document 1 proposes an impact absorbing buffer device including a motion conversion device. The motion conversion device has a beam structure consisting of branch-like arrangement elements. This beam structure converts linear motion (impact) into rotational motion, absorbs and cushions the impact, and improves the impact absorption capacity. Yes.

  Recently, consideration has also been given to the safety of pedestrians. For example, various structures have been proposed in which collision energy is efficiently absorbed by using the viscous resistance of a shock absorber, and not only a vehicle or an occupant but also a shock that a pedestrian receives during a collision (Patent Documents 2 and 3). ).

  For example, Patent Document 2 proposes a vehicle front bumper device having a two-stage bumper structure. The two-stage bumper structure is a structure in which a low-level bumper is usually provided below the bumper. This low bumper directs pedestrians to fall into the hood during a collision. The vehicle front bumper device of Patent Document 2 includes a low-level bumper position adjusting means and a shock absorber (such as a hydraulic cylinder). When a pedestrian collides, the shock absorber's viscous resistance is adjusted and the position of the lower bumper is adjusted to optimize the pedestrian's falling moment.

Patent Document 3 proposes an impact mitigation device for a vehicle in which a bumper is supported by a shock absorber and the impact on the bumper is mitigated by the elastic force and damping force of the shock absorber. In the impact mitigation device of Patent Document 3, the shock absorber is composed of a variable damper that has been put to practical use as a suspension for an automobile, and when the vehicle collides with a pedestrian, the damping force of the variable damper is weakened to soften the bumper.
JP 2000-257688 A JP 2003-260994 A JP-A-10-109605 JP 2002-528682 A

  However, in an impact absorption structure that absorbs collision energy by deformation of the component member, not only the vehicle component member, in order to effectively absorb the collision energy, an area for deforming the component member is secured in advance. There is a problem of having to leave. For this reason, the use and range which can apply an impact-absorbing structure are restrict | limited, and the impact-absorbing structure which absorbs collision energy effectively cannot be installed in a narrow part.

  For example, in order to preserve the cabin space in the event of a vehicle collision, a part of the body must be secured in advance as a deformation area. In the case of a frontal collision, the front body breaks and can effectively absorb the collision energy, but in a collision from an oblique direction or a side direction, even if the thin side body breaks, there is a possibility that the collision energy cannot be fully absorbed. is there. In addition, as described in Patent Document 1, it is possible to improve the shock absorption capacity against a frontal collision by mounting a side member having a structure in which a large number of beam structures are stacked in the length direction. The gap is narrow and it is difficult to accommodate complex beam structures. For this reason, it cannot be applied to a collision from an oblique direction or a side surface direction.

  In addition, as in Patent Documents 2 and 3, a collision absorbing structure that absorbs collision energy by using the viscous resistance of a shock absorber (hydraulic cylinder or the like) must secure an area for placing the shock absorber in advance. There is a problem that must be. It is difficult to reduce the size of the shock absorber, and it cannot be installed in a narrow portion as in the case of the shock absorbing structure that absorbs collision energy by deformation of the constituent members. Moreover, although it can respond to the collision from a specific direction, it cannot respond to the collision from arbitrary directions.

  On the other hand, Patent Document 4 proposes a deployable shock absorbing device as an attempt to make the initial shape of the shock absorbing structure compact. In this shock absorbing device, a beam compressed by mechanical actuator means expands to form an energy absorbing structure. For this reason, it is possible to provide a relatively long “collapse length” after deployment, despite the small size of the initial shape.

  Certainly, the initial shape is more compact than the energy absorbing structure after deployment. However, the structure of the actuator means is complicated and it is difficult to reduce the size and weight, and there is still a problem that an area for storing the actuator means and the compressed beam must be secured in advance. To do. After all, it cannot be installed in a narrow part.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to be flat before installation and to be installed in a narrow part, and to be developed from a plane to a solid with a simple operation. An object of the present invention is to provide a deployment structure that can effectively absorb collision energy. Another object of the present invention is to provide an impact absorbing device capable of absorbing a collision energy by absorbing a collision energy by deploying a deployment structure disposed at the collision position when a collision is unavoidable. Is to provide.

  In order to achieve the above object, the development structure according to claim 1 includes a circumferential first support frame that is fixedly disposed, a first rotating portion that is disposed inside the first support frame, and the first rotation frame. When the one rotation part moves in a direction away from the first support frame, a plurality of the first rotation part and the first support frame are connected to rotate the first rotation part in the first direction. A first deploying member including a first connecting beam, the first rotating part being deployable in a state of being separated from the first support frame, and a circumferential first held rotatably with respect to the first support frame; When the second support frame, the second rotation unit disposed inside the second support frame, and the second rotation unit move away from the second support frame, the second rotation unit is moved to the first support frame. And connecting the second rotating part and the second support frame so as to rotate in a second direction opposite to the direction. A plurality of second connecting beams provided so as not to interfere with the first connecting beams at the time of deployment are arranged so as to overlap the first deploying member, and the second rotating portion is separated from the second support frame On the opposite sides of the first rotating part and the second rotating part so that a force that resists rotation of the second rotating part in the second direction and the second rotating part in the second direction works. A rotation resistance member provided; and a deployment drive unit that deploys each of the first deployment member and the second deployment member by rotating the second support frame in the first direction. .

  The unfolded structure according to claim 2 is characterized in that, in the invention according to claim 1, at least each of the first connecting beam and the second connecting beam is formed of a flat-plate elastic-plastic body. Yes.

  According to a third aspect of the present invention, there is provided the expanded structure according to the first aspect, wherein the first support frame, the first rotating portion, and the plurality of first connecting beams of the first expanded member are plate-shaped. It is characterized by being integrally formed of an elastic-plastic body.

  According to a fourth aspect of the present invention, there is provided the expanded structure according to the first aspect, wherein the second support frame, the second rotating portion, and the plurality of second connecting beams of the second expanded member are plate-shaped. It is characterized by being integrally formed of an elastic-plastic body.

  According to a fifth aspect of the present invention, in the unfolded structure according to any one of the first to fourth aspects, the distance that the second rotating part moves in a direction away from the second support frame is maximized. As described above, the plurality of first connection beams and the plurality of second connection beams are arranged.

  The unfolded structure according to claim 6 is the invention according to any one of claims 1 to 5, wherein the unfolding drive unit is connected to the second support frame and has a convex rotation shaft at the center. And a drive unit that rotationally drives the rotary plate around the rotary shaft.

  According to a seventh aspect of the present invention, there is provided the unfolded structure according to the sixth aspect of the present invention, wherein the rotation of the rotating plate is maximized when the distance that the second rotating portion moves in the direction away from the second support frame is maximized. Further, a rotation stopping means for stopping the rotation is further provided.

  The unfolded structure according to claim 8 is the invention according to any one of claims 1 to 7, wherein the first rotating portion and the first support frame are connected by three first connecting beams. The second rotating part and the second support frame are connected by three second connecting beams.

  The unfolded structure according to claim 9 is the invention according to any one of claims 1 to 8, wherein the rotation resistance member is provided on one of the first rotating portion and the second rotating portion. And a concave portion or an opening that fits with the convex portion provided on the other of the first rotating portion and the second rotating portion.

  A development structure according to a tenth aspect is the invention according to any one of the first to ninth aspects, wherein a notch is formed in the vicinity of an end portion of the first connection beam connected to the first rotation portion. And a notch is provided in the vicinity of the end of the second connecting beam connected to the second rotating portion.

  According to an eleventh aspect of the present invention, there is provided an impact absorbing device comprising: An information acquisition unit that acquires information for specifying, and a collision position that is identified when a collision is detected or a collision is predicted to be unavoidable based on the information acquired by the information acquisition unit A control unit for controlling each of the deployment drive units corresponding to each of the plurality of deployment structures so as to deploy the first deployment member and the second deployment member of the deployment structure installed in It is characterized by that.

  According to the unfolding structure of the present invention, it can be installed in a narrow and narrow portion before unfolding, and it can be unfolded from a plane to a three-dimensional structure with a simple operation of rotationally driving some members, and collision energy can be reduced. There is an effect that it can be absorbed effectively. In addition, according to the impact absorbing device of the present invention, since the unfolded structure of the present invention is used, the unfolded structure can be installed even in a narrow portion, and when the collision is unavoidable, the unfolded structure disposed at the collision position. There is an effect that the body can be expanded to absorb the collision energy and to absorb (relax) the impact.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

<Schematic configuration of expanded structure>
First, a schematic configuration of the development structure according to the embodiment of the present invention will be described.
FIG. 1 is a perspective view showing an appearance of the unfolded structure according to the present embodiment before unfolding. FIG. 2 is a plan view of the same expanded structure as viewed from the front side (expanded side). FIG. 3 is an exploded perspective view of the same expanded structure.

  As shown in FIGS. 1 to 3, the unfolded structure 10 is a disk-shaped structure assembled from a plurality of members, and has a substantially circular shape when viewed from the front side. In the present embodiment, the unfolded structure 10 has a thickness of about several centimeters (for example, 2 cm to 4 cm) and an outer diameter of about several tens of centimeters (for example, 10 cm to 15 cm). . In addition, the magnitude | size of an expansion | deployment structure can be suitably changed according to a use.

  The deployment structure 10 includes an upper plate 12 as a first deployment member, a lower plate 14 as a second deployment member, a rotation plate 16 that rotates the lower plate 14, a motor 20 that drives the rotation plate 16, and the upper plate 12. A ring-shaped motor bracket 18 that is fixed to the motor 20 is provided. The rotating plate 16 and the motor 20 function as a deployment drive unit.

  In the unfolded structure 10 described above, the rotating plate 16 is rotated by driving the motor 20. The lower plate 14 attached to the rotating plate 16 rotates together with the rotating plate 16. By rotating the lower plate 14, the upper plate 12 and the lower plate 14 are developed in a three-dimensional form from a plane as shown in FIGS. 6A and 6B, and a three-dimensional intersection structure 11 in which a plurality of beams intersect is formed. Form. When an impact is applied to the three-dimensional intersection structure 11 from the front side due to a collision or the like, each of the plurality of beams undergoes elasto-plastic deformation and absorbs the collision energy. Since the structure after unfolding is a three-dimensional intersection structure 11, collision energy can be effectively absorbed not only in a collision from the front but also in a collision from an oblique direction.

  The upper plate 12 includes a cylindrical portion 22, a flange portion 24 having a predetermined width formed at the lower end portion of the cylindrical portion 22, and a flange portion 26 having a predetermined width formed at the upper end portion of the cylindrical portion 22. The flange portion 24 extends radially outward of the cylindrical portion 22, and the flange portion 26 extends radially inward of the cylindrical portion 22. The cylindrical portion 22, the flange portion 24, and the flange portion 26 constitute a first support frame of the first deployment member. In the following, for convenience, the flange portion 26 may be described as the first support frame.

  In the same plane as the flange portion 26, a rotating portion 28 provided inside the flange portion 26 and a plurality of connecting beams 30 that connect the flange portion 26 and the rotating portion 28 are provided. The rotating portion 28 is provided with an opening 32 that fits with a convex portion 46 provided on the surface side of the lower plate 14 described later. The flange portion 24 is provided with a plurality of screw holes 34. In the present embodiment, the cylindrical portion 22, the flange portion 24, the flange portion 26, the rotating portion 28, and the connecting beam 30 are integrally formed.

  The lower plate 14 is formed in a flat plate shape. The lower plate 14 has a ring-shaped support frame 36 whose outer diameter is smaller than the inner diameter of the cylindrical portion 22, a rotating portion 38 provided inside the support frame 36, and a plurality of connections that connect the support frame 36 and the rotating portion 38. An arm portion 42 for attaching the beam 40 and the support frame 36 to the rotating plate 16 is provided. The arm part 42 is provided inside the support frame 36 and outside the rotating part 38 and the connecting beam 40. On the surface side of the rotating portion 38, a convex portion 46 that is fitted into the opening 32 of the upper plate 12 is provided. The arm portion 42 is provided with a plurality of through holes 44. In the present embodiment, the support frame 36, the rotating part 38, the connecting beam 40, the convex part 46, and the arm part 42 are integrally formed.

  The rotating plate 16 includes a disk portion 48 having a smaller diameter than the outer diameter of the support frame 36 of the lower plate 14. Near the outer periphery of the disc portion 48, a plurality of through holes 58 are provided at positions corresponding to the plurality of through holes 44 provided in the arm portion 42 of the lower plate 14. The lower plate 14 is overlapped with the rotating plate 16, and a rotation transmission pin 78 having a stepped portion is inserted from the back surface side of the disc portion 48 so as to pass through the through hole 58 and the through hole 44. The lower plate 14 is pinned to the rotating plate 16 by a rotation transmission pin 78 and can be rotated together with the rotating plate 16.

  A cylindrical bearing portion 50 is provided on the back side of the disc portion 48 of the rotating plate 16. The bearing portion 50 includes a through hole 52 that is coaxial with the disc portion 48. The motor 20 includes a columnar motor support 68 and a rotating shaft 71. As the motor 20, it is preferable to use a small motor using an ultrasonic motor or MEMS (Micro Electro Mechanical Systems) technology in order to make the deployment structure 10 compact.

  A rotating shaft 71 of the motor 20 is fitted in the through hole 52 of the bearing portion 50. A through hole 54 is provided in the side wall of the bearing portion 50. A shaft fixing pin 56 is inserted into the through hole 54. The rotation of the bearing portion 50 in the axial direction is suppressed by the shaft fixing pin 56, and the rotation plate 16 can be rotated by the motor 20.

  The motor bracket 18 is a ring-shaped plate-like body whose outer diameter is approximately the same as the outer diameter of the flange portion 24 of the upper plate 12. An opening 60 having an inner diameter larger than the outer diameter of the rotating plate 16 is coaxially provided at the center of the motor bracket 18. A plurality of screw holes 64 are provided in the central portion of the motor bracket 18. Further, near the outer periphery of the motor bracket 18, a plurality of screw holes 66 are provided at positions corresponding to the plurality of screw holes 34 provided in the flange portion 24 of the upper plate 12.

  A flange portion 80 extending radially outward is provided at the upper end of the columnar motor support 68. The flange portion 80 is formed so that the plan view is substantially rectangular when the motor support 68 is viewed from the front side. The flange portion 80 is provided with a plurality of screw holes 73 at positions corresponding to the plurality of screw holes 64 provided in the motor bracket 18.

  The motor bracket 18 is placed on the motor 20 so as to be coaxial with the rotating shaft 71 of the motor 20. A fastening screw 76 having a stepped portion is inserted from the rear surface side of the flange portion 80 so as to pass through the screw hole 73 of the flange portion 80 and the screw hole 64 of the motor bracket 18. The motor bracket 18 is screwed onto the motor 20 by the fastening screw 76. The rotating plate 16 is attached to the motor 20 so as to rotate within the opening 60 of the motor bracket 18.

  On the motor bracket 18, the upper plate 12 is placed with the outer peripheral ends aligned. A fastening screw 74 having a stepped portion is inserted from the surface side of the flange portion 24 so as to pass through the screw hole 34 of the flange portion 24 of the upper plate 12 and the screw hole 66 of the motor bracket 18. The upper plate 12 is screwed onto the motor bracket 18 by the fastening screws 74. A cavity corresponding to the height of the cylindrical portion 22 of the upper plate 12 is formed between the upper plate 12 and the motor bracket 18. The lower plate 14 is rotatably accommodated in this cavity.

  The height of the cylindrical portion 22 is slightly larger than the maximum thickness of the lower plate 14. The rotating part 28 of the upper plate 12 is overlapped with the rotating part 38 of the lower plate 14. The convex part 46 provided in the rotating part 38 is fitted in the opening 32 provided in the rotating part 28. The rotating portion 28 of the upper plate 12 rotates in a predetermined direction with the development. On the other hand, the rotating portion 38 of the lower plate 14 tries to rotate in the direction opposite to the predetermined direction as it is deployed, but is restricted so that the convex portion 46 is fitted into the opening 32 and cannot rotate in the reverse direction. . That is, the fitting mechanism including the convex portion 46 and the opening portion 32 functions as a rotation resistance member. In order to function as a rotation resistance member, the outer peripheral shape of the convex portion 46 or the inner peripheral shape of the opening portion 32 is preferably a polygonal shape such as a triangle, a quadrangle, a pentagon, a hexagon, or a cross shape.

<Detailed configuration of deployment member>
Here, the development structure of the upper plate 12 and the lower plate 14 will be described in more detail. 4A is a perspective view of the upper plate 12 viewed from the front side, and FIG. 4B is a perspective view of the upper plate 12 viewed from the back side. 5A is a perspective view of the lower plate 14 viewed from the front side, and FIG. 5B is a perspective view of the lower plate 14 viewed from the back side.

  As described above, the upper plate 12 includes the cylindrical portion 22, the flange portion 24, the flange portion 26, the rotating portion 28, and the connecting beam 30. The cylindrical portion 22, the flange portion 24, the flange portion 26, the rotating portion 28, and the connecting beam 30 are integrally formed of an elastic-plastic material (elastic-plastic body) such as metal or resin. The lower plate 14 includes a support frame 36, a rotating part 38, a connecting beam 40, a convex part 46, and an arm part 42. The support frame 36, the rotating part 38, the connecting beam 40, the convex part 46, and the arm part 42 are integrally formed of an elastic-plastic material.

  Resin materials with elastoplasticity include general-purpose resins such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyester-based thermoplastic elastomers, olefin-based thermoplastic elastomers, and styrene-based resins. A thermoplastic elastomer such as a thermoplastic elastomer can be used. A composite material reinforced with fiber or a bonded structure of a metal, a fiber material, and a resin is also suitable as the material.

  In addition, if the beam breaks immediately at the time of collision, the impact will not be sufficiently relaxed, resulting in problems such as exposing the fracture surface. Therefore, when using a material that is easy to break, if there is a portion that is easy to break, each of the upper plate 12 and the lower plate 14 can be reinforced by a reinforcing member, such as by attaching a reinforcing cloth or a reinforcing tape to the surface. preferable. While avoiding embrittlement and breakage by reinforcement, collision energy can be effectively absorbed by elastic-plastic deformation.

(Upper plate)
As shown in FIGS. 4A and 4B, in the present embodiment, the upper plate 12 has a ring-shaped flange portion 26 and an outer peripheral shape provided inside the flange portion 26 as a developed structure. An equilateral triangular rotating part 28 and three connecting beams 30 connecting the flange part 26 and the rotating part 28 are provided. In addition, a hexagonal opening 32 is formed at the central portion of the rotating portion 28 with the perpendicular line passing through the center point of the regular triangular rotating portion 28 as an axis.

  Although the thickness of the flange part 26, the rotation part 28, and the connection beam 30 may be the same, they may be different. For example, in order to facilitate elasto-plastic deformation, it is preferable to form the rotating portion 28 and the connecting beam 30 thinner than the flange portion 26. The flange portion 26 and the connecting beam 30 are each formed with a predetermined width. Hereinafter, the width of the flange portion 26 is referred to as “frame width”, and the width of the connecting beam 30 is referred to as “beam width”.

  The equilateral triangle rotation unit 28 has three vertices. In the upper plate 12, the three vertices are set counterclockwise in the order of the first vertex → the second vertex → the third vertex as viewed from the front side of the upper plate 12. The first connecting beam 30 has one of the three vertices as the first vertex, one end of which is connected to the first vertex, and the second vertex adjacent to the first vertex and the first vertex. It extends parallel to one side of the equilateral triangle connecting the apex. One end of the second connecting beam 30 is connected to the second apex, and extends in parallel to one side connecting the second apex and the third apex. One end of the third connecting beam 30 is connected to the third apex, and extends in parallel with one side connecting the third apex and the first apex.

  In the present embodiment, sickle-shaped cuts 25 are formed at three locations with respect to the disk-shaped elastic-plastic body. Each of the sickle-shaped cuts 25 has the same shape, and is disposed at a symmetrical position with respect to the center point of the rotating portion 28. By forming the sickle-shaped cuts 25, the three long connecting beams 30 are separated from the flange portion 26, leaving three connecting portions 27 where the connecting beams 30 are connected to the flange portion 26. The equilateral triangular rotating part 28 is separated from the connecting beam 30, leaving three connecting parts 29 where the connecting beam 30 is connected to the rotating part 28.

  In other words, one end of each connecting beam 30 is connected to the flange portion 26 by the connecting portion 27, and the other end of each connecting beam 30 is connected to the rotating portion 28 by the connecting portion 29. Thus, the rotating portion 28 is connected to the ring-shaped flange portion 26 by the three connecting beams 30. As described above, the three apexes are set counterclockwise in the order of the first apex → the second apex → the third apex as viewed from the front side of the upper plate 12, so that the rotating part is developed along with the expansion. 28 rotates counterclockwise. Further, since the rotating portion 28 is connected to the flange portion 26 by the connecting beam 30, as the rotating portion 28 moves away from the flange portion 26 in the deployment direction, the rotating portion 28 is pulled back, that is, the rotation is stopped (rotating portion). The force acts in the direction in which 28 is rotated clockwise.

  In the present embodiment, each of the three connecting portions 29 is arranged near the break point of the sickle-shaped cut 25. For this reason, in order to facilitate the movement of the connecting portion 29, the edge portion of each connecting portion 29 is formed with a rounded corner. Further, as shown in FIG. 8A, it is preferable to provide a V-shaped notch 29 </ b> A on the side close to the connecting beam 30 at the edge of each connecting portion 29. With the V-shaped notch 29 </ b> A, when the rotating portion 28 is moved to the limit position, the connecting portion 29 does not warp, and the connecting beam 30 can be easily bent at the connecting portion 29.

  The upper plate 12 is preferably designed so that the length of the connecting beam 30 is as long as possible. As the connecting beam 30 becomes longer, the stroke at the time of deployment (the distance by which the rotating part 28 moves in the pressing direction) becomes larger. In the present embodiment, by arranging each of the three connecting beams 30 so that the equilateral triangle formed by the three connecting beams 30 is arranged just inside the ring-shaped flange portion 26, The length of the connecting beam 30 is designed to be the longest. In addition to the length of the connection beam 30, the shape of the cut 25 takes into account the frame width of the flange portion 26, the beam width of the connection beam 30, the cut width of the cut 25, the width of the connecting portions 27 and 29, and the like. Designed.

(Lower plate)
As shown in FIGS. 5A and 5B, in the present embodiment, the lower plate 14 has a ring-shaped support frame 36 and an outer peripheral shape provided inside the support frame 36 as a developed structure. An equilateral triangular rotating part 38, three connecting beams 40 that connect the supporting frame 36 and the rotating part 38, and an arm part 42 for attaching the supporting frame 36 to the rotating plate 16 are provided. In addition, a hexagonal convex portion 46 is formed at the central portion on the surface side of the rotating portion 38 with a perpendicular passing through the center point of the regular triangular rotating portion 38 as an axis.

  The thicknesses of the support frame 36, the rotating portion 38, the connecting beam 40, and the arm portion 42 may be the same or different. For example, in order to facilitate elasto-plastic deformation, it is preferable to form the rotating portion 38 and the connecting beam 40 thinner than the support frame 36. In order to securely attach the lower plate 14 to the rotating plate 16, it is preferable to form the arm portion 42 with the same thickness as the support frame 36. In the present embodiment, the back side of the lower plate 14 is formed flush with the surface of the lower plate 14 such that the rotating portion 38 and the connecting beam 40 are lower than the support frame 36 and the arm portion 42. Is formed. That is, the rotating part 38 and the connecting beam 40 are formed thinner than the support frame 36 and the arm part 42.

  The support frame 36 and the connecting beam 40 are each formed with a predetermined width. In the present embodiment, the frame width of the support frame 36 is substantially the same as the frame width of the flange portion 26 of the upper plate 12, and the beam width of the connecting beam 40 is the same as the beam width of the connecting beam 30 of the upper plate 12. The width is almost the same.

  The equilateral triangle rotation unit 38 has three vertices. In the lower plate 14, the three vertices are set clockwise in the order of the first vertex → the second vertex → the third vertex as viewed from the front side of the lower plate 14. The first connecting beam 40 has one of three vertices as a first vertex, one end of which is connected to the first vertex, and a second vertex adjacent to the first vertex and the first vertex. It extends parallel to one side of the equilateral triangle connecting the apex. One end of the second connection beam 40 is connected to the second vertex, and extends in parallel with one side connecting the second vertex and the third vertex. One end of the third connecting beam 40 is connected to the third vertex, and extends in parallel with one side connecting the third vertex and the first vertex.

  In the present embodiment, ax-shaped cuts 41 are formed at three locations with respect to the disk-shaped elastic-plastic body. Each of the ax-shaped cuts 41 has the same shape, and is disposed at a symmetrical position with respect to the center point of the rotating portion 38. By forming the ax-shaped cut 41, the three long connecting beams 40 are separated from the support frame 36, leaving three connecting portions 43 where the connecting beams 40 are connected to the support frame 36. The equilateral triangular rotating part 38 is separated from the connecting beam 40, leaving three connecting parts 45 where the connecting beam 40 is connected to the rotating part 38.

  In other words, one end of each connecting beam 40 is connected to the support frame 36 by the connecting portion 43, and the other end of each connecting beam 40 is connected to the rotating portion 38 by the connecting portion 45. Thus, the rotating portion 38 is connected to the ring-shaped support frame 36 by the three connecting beams 40. In the present embodiment, the width of the connecting portion 43 is substantially the same as the width of the connecting portion 27 of the upper plate 12, and the width of the connecting portion 45 is substantially the same as the width of the connecting portion 29 of the upper plate 12. is there.

  In the present embodiment, each of the three connecting portions 45 is rounded with the corners of the edge portions cut away in order to facilitate the movement of the connecting portion 45. Further, as shown in FIG. 8B, it is preferable to provide a V-shaped cutout 45A on the side of the edge of each connecting portion 45 close to the connecting beam 40. Due to the V-shaped cutout 45 </ b> A, when the rotating portion 38 is moved to the limit position, the connecting portion 45 is not warped, and the connecting beam 40 is easily bent at the connecting portion 45.

  As described above, the three vertices of the regular triangular rotation unit 38 are set clockwise in the order of the first vertex → the second vertex → the third vertex as seen from the front side of the lower plate 14. That is, in a state where the upper plate 12 and the lower plate 14 are overlapped, the extending direction of the connecting beam 30 of the upper plate 12 (the direction from the connecting portion 29 to the connecting portion 27) extends of the connecting beam 40 of the lower plate 14. The direction (direction from the connecting portion 45 toward the connecting portion 43) is opposite. If the support frame 36 of the lower plate 14 is fixed, the rotating portion 38 rotates clockwise with respect to the support frame 36 with the development.

  In the present embodiment, the support frame 36 of the lower plate 14 rotates counterclockwise as the rotating plate 16 rotates. The rotating plate 16 is rotated in a direction in which a compressive load acts on both the connecting beam 30 of the upper plate 12 and the connecting beam 40 of the lower plate 14. The rotating portion 38 of the lower plate 14 is restricted by the fitting mechanism so that it can rotate only in the same direction as the rotating portion 28 of the upper plate 12. Therefore, as the support frame 36 of the lower plate 14 rotates counterclockwise, a compressive load is applied to the connecting beam 40, the rotating part 38 whose rotation is restricted is separated from the support frame 36, and the lower plate 14 is deployed. By the movement of the rotation unit 38, the rotation unit 28 of the upper plate 12 is pushed up. Thereby, the upper plate 12 is developed together with the lower plate 14.

  Since the rotating portion 38 is connected to the support frame 36 by the connecting beam 40, the direction in which the rotating portion 38 is pulled back as the rotating portion 38 moves away from the support frame 36, that is, the direction in which the rotation is stopped (the rotating portion). A force is exerted in the direction in which 38 is rotated counterclockwise.

  In the lower plate 14, when the upper plate 12 is overlapped and developed, the rotating portion 38 and the connecting beam 30 of the upper plate 12 do not interfere with each other (that is, do not interfere with the movement), and the connecting beam 40 and the upper plate The rotating part 38 and the connecting beam 40 are formed so that the twelve rotating parts 28 and the connecting beam 30 do not interfere with each other. When these interferences occur, the deployment of the deployment structure 10 is hindered.

  Further, similarly to the upper plate 12, the lower plate 14 is preferably designed so that the length of the connecting beam 40 is as long as possible. The longer the connecting beam 40, the larger the stroke at the time of deployment (the distance that the rotating part 38 moves in the pressing direction). In the present embodiment, the length of the connecting beam 40 is designed to be the longest by reducing the rotating portion 38.

  Further, in the present embodiment, fan-shaped cuts 47 are formed at three locations with respect to the disk-shaped elastic-plastic body. Each of the fan-shaped cuts 47 has the same shape, and is disposed at a symmetrical position with respect to the center point of the rotating portion 38. By forming the fan-shaped cuts 47, three arch-shaped arm portions 42 are formed on the support frame 36 of the lower plate 14. Since the disk portion 48 of the rotating plate 16 has a smaller diameter than the support frame 36 of the lower plate 14, an attachment arm portion 42 is formed so as to protrude toward the inside of the support frame 36. These arm portions 42 are arranged outside the rotating portion 38 and the connecting beam 40 so as not to interfere with the rotating portion 38 and the connecting beam 40.

  The shapes of the cuts 41 and 47 are the length of the connecting beam 30, the frame width of the flange portion 26, the beam width of the connecting beam 30, the cut width of the cut 25, the width of the connecting portions 27 and 29, and the rotation plate 16. It is designed appropriately in consideration of the positional relationship of

<Unfolding operation of unfolding structure>
Next, the unfolding operation of the unfolding structure 10 will be described.
FIGS. 6A and 6B are perspective views showing the appearance of the unfolded structure during unfolding. FIG. 6A is a perspective view showing a state of the unfolding structure during unfolding. FIG. 6B is a perspective view showing a state of the expanded structure expanded to the limit position. FIGS. 7A and 7B are plan views for explaining the unfolding behavior of each unfolding portion. FIG. 7A is a plan view of the development behavior of the upper plate 12 as viewed from the front side. FIG. 7B is a plan view of the development behavior of the lower plate 14 as viewed from the front side.

  As shown in FIG. 7B, when a collision or the like is detected, the rotation plate 16 rotates in the direction of arrow A (counterclockwise with respect to the rotation axis) by driving a motor 20 (not shown). When the rotating plate 16 rotates, the support frame 36 of the lower plate 14 attached to the rotating plate 16 by the rotation transmission pin 78 rotates together with the rotating plate 16 in the arrow A direction. The rotating portion 38 of the lower plate 14 has a convex portion 46 fitted in the opening 32 of the upper plate 12, and the rotating portion 38 is restricted so that it can rotate only in the same direction as the rotating portion 28 of the upper plate 12. Yes.

  As shown in FIG. 6 (A), as the support frame 36 of the lower plate 14 rotates counterclockwise, the rotation unit 38 whose rotation is restricted moves away from the support frame 36, and the lower plate 14 moves from the plane. Expand into a solid. First, in the lower plate 14, both ends of the connecting beam 40 begin to bend due to elastic-plastic deformation as the rotating portion 38 moves. In particular, the connecting portion 43 where the connecting beam 40 is connected to the support frame 36 and the connecting portion 45 where the connecting beam 40 is connected to the rotating portion 38 are curved by elastic-plastic deformation.

  Further, the rotation unit 28 of the upper plate 12 is pushed up by the movement of the rotation unit 38. As a result, the upper plate 12 and the lower plate 14 are also developed in a three-dimensional manner from the plane. That is, the lower plate 14 converts the rotational force transmitted from the rotating plate into an upward force that pushes up the rotating portion 28 of the upper plate 12, and the upper plate 12 and the lower plate 14 develop. Here, the rotational motion is converted into a linear motion.

  As shown in FIG. 7A, the rotating portion 28 rotates in the arrow B direction (counterclockwise with respect to the rotation axis) while moving away from the flange portion 26. Similarly, in the upper plate 12, both ends of the connecting beam 30 begin to bend due to elastic-plastic deformation as the rotating portion 28 moves. In particular, the connecting portion 27 where the connecting beam 30 is connected to the flange portion 26 and the connecting portion 29 where the connecting beam 30 is connected to the rotating portion 38 are curved by elastic-plastic deformation.

  As shown in FIG. 6B, in the lower plate 14, the connecting beam 40 is further bent due to elastic-plastic deformation as the rotating portion 38 further moves. In particular, the connecting beam 40 is greatly bent at both ends, and is bent in the vicinity of the connecting portion 45. Similarly, in the upper plate 12, the connection beam 30 is further bent due to elastic-plastic deformation as the rotating portion 28 further moves. The connecting beam 30 is greatly curved at both ends, and is bent in the vicinity of the connecting portion 29.

  When the motor 20 is stopped by shutting off the power supply or the like, the development of the deployment structure 10 is completed, and a three-dimensional intersection structure 11 (deployment structure) in which a plurality of beams intersect is formed. In this example, the three-dimensional intersection structure 11 having a total of six beams including three connecting beams 30 and three connecting beams 40 is formed. For example, as shown in FIG. 6B, the rotation unit 28 and the rotation unit 38 are moved to the limit position, and the deployment structure 10 is completely deployed. Or as shown to FIG. 6 (A), the rotation part 28 and the rotation part 38 are moved to the middle, and the expansion | deployment of the expansion | deployment structure 10 is completed. In this case, it is possible to adjust the impact absorbing power of the three-dimensional intersection structure 11 according to the moving distance of the rotating unit 28 and the rotating unit 38.

  Even after the motor 20 is stopped, the three-dimensional intersection structure 11 is held by the holding force of the motor 20. For example, when an ultrasonic motor is used as the motor 20, the three-dimensional intersection structure 11 is held by the frictional force even when the power is turned off. However, since the rotating portion 28 is connected to the flange portion 26 by the connecting beam 30, and the rotating portion 38 is connected to the support frame 36 by the connecting beam 40, the rotating portion 28 and the rotating portion 38 are separated from the respective support frames and the like. Accordingly, a force acts in a direction in which the rotating portion is pulled back, that is, in a direction in which the rotating plate 16 is rotated in the reverse direction.

  Therefore, it may be difficult to hold the unfolded structure only with the holding force of the motor 20. In such a case, a rotation preventing means for limiting the rotation direction to one direction, such as a ratchet mechanism, may be provided between the outer peripheral portion of the rotation plate 16 and the motor bracket 18. At the position where the rotating plate 16 is rotated to a predetermined angle, the ratchet can be locked to complete the deployment of the deployment structure 10, and the deployment structure can be fixed. The ratchet mechanism can also be provided between the rotating plate 16 and the upper end portion (or flange portion 80) of the motor support 68.

<Shock absorber>
Next, a schematic configuration of the shock absorbing device according to the embodiment of the present invention will be described. The impact absorbing device is configured to include the above-described deployment structure. 10A to 10C are schematic diagrams for explaining the principle of shock absorption. In the impact absorbing device according to the present embodiment, when a collision is detected (including when the collision is predicted to be unavoidable), the above-described unfolded structure 10 is deployed to have a three-dimensional intersection structure 11 having a plurality of beams. To absorb the collision energy.

  FIG. 10A shows the state of the unfolded structure 10 before a collision is detected (before unfolding). In the deployment structure 10 before deployment, a cavity is formed between the upper plate 12 and the motor bracket 18. The lower plate 14 is attached to the rotating plate 16 except for the unfolded structure (the rotating portion 38 and the connecting beam 40). The lower plate 14 is rotatably accommodated in the cavity with the upper plate 12 being overlapped. The rotating portion 28 of the upper plate 12 and the rotating portion 38 of the lower plate 14 are fitted so as to rotate together around a common rotation axis R.

FIG. 10B shows the state of the deployment structure 10 immediately after a collision is detected (when deployed). When the collision is detected, the rotating plate 16 is rotated around the rotation axis R by the motor 20 (not shown). The support frame 36 of the lower plate 14 rotates as the rotating plate 16 rotates. The support frame (flange portion 26) of the upper plate 12 is fixedly arranged. The rotating portion 38 of the lower plate 14 is restricted so that it can rotate only in the same direction as the rotating portion 28 of the upper plate 12. As the support frame 36 of the lower plate 14 rotates, a compressive load acts on both the connecting beam 30 of the upper plate 12 and the connecting beam 40 of the lower plate 14. Thereby, the rotating part 38 is separated from the support frame 36, and the lower plate 14 is developed. Due to the movement of the rotating portion 38, the rotating portion 28 of the upper plate 12 is pushed up by the force F _UP and the upper plate 12 is deployed together with the lower plate 14.

  As described above, both ends of the connecting beam 30 of the upper plate 12 and the connecting beam 40 of the lower plate 14 bend due to elasto-plastic deformation as the deployment structure 10 is deployed. That is, the connecting beam 30 of the upper plate 12 is curved near the connecting portions 27 and 29, and the connecting beam 40 of the lower plate 14 is bent near the connecting portions 43 and 45. At the deployment limit, the connecting beam 30 of the upper plate 12 bends in the vicinity of the connecting portion 29, and the connecting beam 40 of the lower plate 14 bends in the vicinity of the connecting portion 45. Thereby, the three-dimensional intersection structure 11 in which a plurality of beams composed of the connecting beam 30 and the connecting beam 40 intersect is formed. Once the three-dimensional intersection structure 11 is formed, the three-dimensional intersection structure 11 is maintained by the holding force of the motor 20 (not shown).

FIG. 10C shows the state of the three-dimensional intersection structure 11 at the time of collision. A weight G is placed on the three-dimensional intersection structure 11 and a load F _DOWN is applied to the three-dimensional intersection structure 11. This is the same state as when the collision energy is given to the three-dimensional intersection structure 11. The connecting beam 30 of the upper plate 12 and the connecting beam 40 of the lower plate 14 are elastically plastically deformed to absorb collision energy.

  Although not shown, in the process of absorbing the collision energy, the connecting beam 30 of the upper plate 12 is relaxed in bending at the connecting portion 27, and the central portion starts to bend due to elastic-plastic deformation. Similarly, in the connecting beam 40 of the lower plate 14, the bending at the connecting portion 43 is alleviated, and the central portion starts to bend due to elastic-plastic deformation. When the connecting beam 40 of the lower plate 14 is shorter than the connecting beam 30 of the upper plate 12, the lower plate 14 tries to return to the state before deployment. For this reason, the connecting beam 30 of the upper plate 12 is further elasto-plastically deformed and bent at the central portion or the connecting portion 29 of the connecting beam 30.

(Example of arrangement of unfolded structure in shock absorber)
FIG. 11 is a plan view showing an arrangement example of the development structure 10. Since the unfolded deployment structure 10 has a planar shape, the impact absorbing structure 70 can be formed by arranging a large number of deployment structures 10 in a two-dimensional arrangement. As described above, in the unfolded structure 10, the upper plate 12 side to be unfolded is the front side, and the motor 20 side is the back side (see FIG. 1). The deployment structure 10 is installed with the back side on which the motor 20 is provided facing the installation surface. The unfolding structure 10 unfolds toward the near side in the drawing.

  In the present embodiment, since the development structure 10 has a substantially circular shape in plan view, it can be arranged at the installation site in a close-packed arrangement in which six circles are arranged around one circle. In addition, although the example which arrange | positions the expansion | deployment structure 10 planarly was shown here, the expansion | deployment structure 10 can also be arrange | positioned in parallel according to a use. In other words, the plurality of development structures 10 can be arranged so that the front side and the back side of the two adjacent development structures 10 face each other.

(Example of vehicle shock absorber)
FIG. 12 is a perspective view illustrating an installation site when the deployment structure 10 is installed in a vehicle. In preparation for the collision with the colliding object, the hood panel 90, the front bumper 92, the front side door 94, the front fender panel 96, the front pillar 98, and the like can be installed. The deployment structure 10 having a compact and planar shape includes a gap between the outer panel and the inner panel constituting the hood panel 90, a space between the bumper cover and the bumper frame of the front bumper 92, and the hood panel 90 and the front panel. It can also be installed in a narrow and small part where a crush box cannot normally be installed, such as a gap with the fender panel 96. Moreover, you may install in a luggage door or a rear bumper in preparation for the collision at the time of back.

  FIG. 13 is a block diagram showing a configuration of the shock absorbing device according to the embodiment of the present invention. This impact absorbing device is mounted on a vehicle and used. In the shock absorbing device 100 according to the present embodiment, a shock absorbing structure 70 composed of a plurality of deployment structures 10 and a sensor group installed as information acquiring means for acquiring information for specifying the collision position of the colliding object. 102 and a control unit 104 that controls the deployment driving unit 72 of the shock absorbing structure 70 based on information acquired from the sensor group 102.

  The plurality of deployment structures 10 each include a deployment drive unit 72 that deploys the deployment structure 10. The control unit 104 controls each of the plurality of deployment driving units 72 independently. In the drawing, the unfolding structure 10 and the unfolding drive unit 72 are separately illustrated. However, in the present embodiment, the rotating plate 16 and the motor 20 constituting the unfolding structure 10 are attached to the unfolding drive unit 72. Equivalent to.

  The deployment structure 10 provided with the deployment drive unit 72 is arranged in a planar shape or in parallel to constitute the above-described shock absorbing structure 70. As described above, a large number of shock absorbing structures 70 are installed in various parts of the vehicle where a collision is expected, such as the hood panel 90, the front bumper 92, the front side door 94, the front fender panel 96, and the front pillar 98.

  The sensor group 102 includes a video camera 102A that captures the front, side, and rear of the host vehicle, an infrared camera 102B that captures thermal images of the front, side, and rear of the host vehicle, and the front, side, and rear of the host vehicle. Are provided with a radar 102C for detecting the obstacle (collision object), and a pressure-sensitive sensor 102D for detecting a collision from the front, side, and rear to the host vehicle. The radar 102C may be a laser radar or a millimeter wave radar. Data obtained by each of the video camera 102A, the infrared camera 102B, the radar 102C, and the pressure sensor 102D is sequentially input to the control unit 104.

  The control unit 104 is provided with a collision site estimation unit 106 that estimates a site where the colliding object collides, and a collision range estimation unit 108 that estimates a range where the colliding object collides at the estimated collision site. When the collision is detected or the collision is predicted to be unavoidable based on the data input from the sensor group 102, the shock absorbing structure 70 installed in the estimated collision range of the estimated collision site. The unfolding drive unit 72 is actuated to deploy the unfolding structure 10 at the collision position. The three-dimensional intersection structure 11 having a plurality of beams is formed by the development, and the collision energy is absorbed by the three-dimensional intersection structure 11.

  FIG. 14 is a flowchart illustrating an example of an operation routine performed by the control unit 104. First, in step S10, the risk of collision is detected based on the data input from the sensor group 102. For example, it is possible to detect the presence or absence of the collision object and the approach direction of the collision object from the data obtained by the radar 102C. If the approaching direction of the colliding object is known, it can be determined whether the collision is a frontal collision or a side collision, and the part where the colliding object collides can be estimated. In the next step S12, the shape / weight / velocity of the collision object is predicted based on the data input from the sensor group 102. If the shape, weight, and speed of the collision object are known, it is possible to estimate the specific collision range at the collision site as well as the site where the collision object collides.

  Next, in step S14, it is determined whether or not the collision can be avoided from the predicted shape / weight / velocity of the collision object. If it is determined that a collision can be avoided (affirmative determination), the routine ends there. On the other hand, if it is determined that a collision cannot be avoided (negative determination), in order to deploy the deployment structure 10 of the shock absorbing structure 70, a drive signal is output to the deployment drive unit 72, and the routine is terminated. In this way, a control operation can be performed according to the characteristics of the collision object, such as the deployment structure 10 of a necessary part being deployed.

  As described above, the unfolding structure of the present embodiment has a three-dimensional intersection structure with a plurality of beams that are unfolded in a three-dimensional form from a plane with a simple operation of rotating some members with a small motor. Can be formed.

  In addition, since the deployment structure of the present embodiment has a compact and planar shape before deployment, it can be installed in a narrow and small part where a crash box or the like cannot be installed. Moreover, since the expansion | deployment structure of this Embodiment is planar view, it can be arranged finely.

  Further, since the unfolded structure of the present embodiment forms a three-dimensional intersection structure with a plurality of beams after unfolding, each of the plurality of beams undergoes elasto-plastic deformation when an impact due to a collision is applied from the surface side. Can absorb collision energy. In particular, because of the three-dimensional intersection structure, collision energy can be effectively absorbed not only in a collision from the front but also in a collision from an oblique direction. Furthermore, the amount of collision energy absorption can be adjusted by changing the arrangement and number of beams in the three-dimensional intersection structure according to the application. That is, it is possible to give arbitrary rigidity.

  In addition, since the shock absorbing device of the present embodiment has a large number of shock absorbing structures including the deploying structure arranged on a collision object such as a vehicle and individually controlled to drive, the deploying structure arranged at the collision position The body can be deployed to absorb the impact of collision. That is, a control operation can be performed in accordance with the characteristics of the collision object, such as deploying a deployment structure at a necessary site.

  Also, based on the data input from the sensor group, the presence / absence of a colliding object is determined, and the shape / weight / velocity of the colliding object is measured. If the collision cannot be avoided by estimating the range of the collision, the deployment structure disposed at the estimated collision position can be deployed to absorb the impact caused by the collision.

<Modification>
Hereinafter, modifications of the above embodiment will be described.

(Industrial application fields)
In the above embodiment, an example in which a deployment structure is installed on the body of a vehicle such as a front bumper and used as an impact absorbing device has been described, but the deployment structure having a compact and planar shape is It can be installed in narrow and small parts. It can also be used as a MEMS (Micro Electro Mechanical Systems) device. That is, it can also serve as a collision buffer structure or actuator in a fine space. It is also possible to install a deployment structure on the bottom of an airplane, such as an aircraft or helicopter, that is required to be lighter, and use it as an impact absorbing device in case of emergency landing. Furthermore, by devising the deployment structure, it can be applied to deployment structures (antennas, solar cell panels, etc.) used in outer space.

(Modified example of unfolded structure)
In the above-described embodiment, a development structure (deployment structure 10) having a substantially circular shape in plan view is used, and in a three-dimensional intersection structure (three-dimensional intersection structure 11), a structure in which a rotating portion of an equilateral triangle is supported by three connecting beams. Although the example has been described, the structure of the expanded structure is not limited to the structure of the above embodiment. A suitable shape can be selected according to the application. The amount of collision energy absorption can be adjusted by changing the arrangement and number of connecting beams in the three-dimensional intersection structure. In addition, the shape of the rotating portion, the fitting structure, and the shape / arrangement / number of connecting beams may be different between the first deployment member and the second deployment member constituting the deployment structure.

  For example, a structure in which the rotating portion is supported by three connecting beams is most preferable because there is no play beam, and the number of connecting beams supporting the rotating portion is not limited to three. Two or four or more may be used. When the number of connecting beams increases, the amount of collision energy absorption due to elastic-plastic deformation increases. Increasing the length of the connecting beam increases the amount of collision energy absorbed by elastic-plastic deformation. Increasing the width of the connecting beam increases the amount of collision energy absorbed by elastic-plastic deformation.

  The width of the connecting beam need not be constant, and the beam width may change in the longitudinal direction of one connecting beam. Furthermore, the cross-sectional shape of the connecting beam need not be rectangular, and the thickness may change in the longitudinal direction of the cross-section.

  Further, the shape of the rotating part is not limited to an equilateral triangle as long as it is rotatable around the rotation axis. The planar view shape of the rotating part may be a circle (perfect circle, ellipse, etc.) or a polygon other than a triangle (square, pentagon, hexagon, octagon, etc.).

  Similarly, the fitting structure (rotation resistance member) between the first deployment member and the second deployment member includes an opening having a hexagonal inner peripheral shape provided on the first deployment member (upper plate 12), (2) The outer peripheral shape provided on the developing member (lower plate 14) is not limited to fitting a convex portion having a hexagonal shape. Other shapes may be used as long as they fit each other, and a combination of a concave portion and a convex portion may be used. Moreover, a convex part can be provided in the 1st expansion | deployment member side, and a recessed part or an opening part can also be provided in the 2nd expansion | deployment member side.

(Modified example of unfolding member)
In the above embodiment, an example in which the developing members shown in FIGS. 7A and 7B are used as the first developing member (upper plate 12) and the second developing member (lower plate 14) has been described. However, the structure of the first deployment member and the second deployment member is not limited to this. Various modifications are possible.

  FIG. 9 shows an example of a modification of the second deployment member. In this example, as shown in FIG. 9, the support frame 36 is attached to the rotating plate 16 </ b> B without providing an arm portion in the second developing member (lower plate 14 </ b> B). By omitting the arm portion, the lower plate 14B can have a simple structure, and the degree of freedom of arrangement (layout) of the “connection beam” and the “rotating portion” in the lower plate 14B is increased.

  The support frame 36 is provided with a plurality of through holes 44B. The rotating plate 16B includes a disc portion 48B having the same diameter as the outer diameter of the support frame 36 of the lower plate 14B. A plurality of through holes 58B are provided in the vicinity of the outer periphery of the disc portion 48B at positions corresponding to the plurality of through holes 44B provided in the support frame 36 of the lower plate 14B.

  The lower plate 14B is superposed on the rotating plate 16B, and a rotation transmission pin 78 having a stepped portion is inserted from the back surface side of the disc portion 48B so as to pass through the through hole 58B and the through hole 44B. The lower plate 14B is pinned to the rotating plate 16B by a rotation transmission pin 78, and can be rotated together with the rotating plate 16B.

It is a perspective view which shows the external appearance before expansion | deployment of the expansion | deployment structure which concerns on this Embodiment. It is the top view which looked at the expansion | deployment structure shown in FIG. 1 from the front side (expansion side). It is a disassembled perspective view of the expansion | deployment structure shown in FIG. (A) is the perspective view which looked at the upper plate from the front side, (B) is the perspective view which looked at the upper plate from the back side. (A) is the perspective view which looked at the lower plate from the front side, (B) is the perspective view which looked at the lower plate from the back side. (A) is a perspective view which shows the mode of the expansion | deployment structure in the middle of expansion | deployment, (B) is a perspective view which shows the mode of the expansion | deployment structure expanded to the limit position. (A) is the top view which looked at the expansion | deployment behavior of the upper plate from the front side, (B) is the top view which looked at the expansion | deployment behavior of the lower plate from the front side. (A) And (B) is a top view which shows an example of the modification of a 1st expansion | deployment member and a 2nd expansion | deployment member. It is a top view which shows an example of the modification of a 2nd expansion | deployment member. (A)-(C) are the schematic explaining the principle of shock absorption. It is a top view which shows the example of arrangement | positioning of an expansion | deployment structure. It is a perspective view which illustrates the installation part in the case of installing a deployment structure in vehicles. It is a block diagram which shows the structure of the shock absorber which concerns on embodiment of this invention. It is a flowchart which shows an example of the action | operation routine which a control part performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Unfolding structure 11 Three-dimensional crossing structure 12 Upper plate 14 Lower plate 14B Lower plate 16 Rotating plate 16B Rotating plate 18 Motor bracket 20 Motor 22 Cylindrical part 24 Flange part 26 Flange part 27, 19 Connecting part 28 Rotating part 30 Connecting beam 32 Opening Part 34 screw hole 36 support frame 38 rotating part 40 connecting beam 42 arm part 43, 45 connecting part 44 through hole 44B through hole 46 convex part 48 disk part 48B disk part 50 bearing part 52 through hole 54 through hole 56 shaft fixed Pin 58 Through-hole 58B Through-hole 60 Opening 64 Screw hole 66 Screw hole 68 Motor support 71 Rotating shaft 70 Shock absorbing structure 73 Screw hole 72 Deployment drive part 74 Fastening screw 76 Fastening screw 78 Rotation transmission pin 80 Flange part 90 Food panel 92 Front bumper 94 Front side door 96 Front Fender panel 98 Front pillar 100 Shock absorber 102 Sensor group 102A Video camera 102C Radar 102D Pressure sensor 102B Infrared camera 104 Control unit 106 Collision site estimation means 108 Collision range estimation means F _DOWN load F _UP force G Weight stone R Rotating shaft

Claims (11)

When the circumferentially arranged first support frame fixedly arranged, the first rotating part arranged inside the first supporting frame, and the first rotating part move in a direction away from the first supporting frame, A plurality of first connecting beams that connect the first rotating part and the first support frame so as to rotate the first rotating part in a first direction, wherein the first rotating part is the first support frame; A first deployment member that can be deployed away from
A circumferential second support frame rotatably held with respect to the first support frame, a second rotating part disposed inside the second support frame, and the second rotating part are the second support frame And connecting the second rotating part and the second support frame so as to rotate the second rotating part in a second direction opposite to the first direction when moving in a direction away from A plurality of second connecting beams provided so as not to interfere with the first connecting beams at the time of deployment are arranged so as to overlap the first deploying member, and the second rotating portion is separated from the second support frame A second deployment member that can be deployed in a state;
A rotation resistance member provided on each of the opposing sides of the first rotating part and the second rotating part so that a force resisting the rotation of the second rotating part in the second direction works;
A deployment drive unit that rotates the second support frame in the first direction to deploy each of the first deployment member and the second deployment member;
An expanded structure containing   The unfolded structure according to claim 1, wherein at least each of the first connecting beam and the second connecting beam is formed of a flat-plate elastic-plastic material.   The deployment structure according to claim 1, wherein the first support frame, the first rotating portion, and the plurality of first connection beams of the first deployment member are integrally formed of a plate-like elastic-plastic body.   The expansion | deployment structure of Claim 1 with which the said 2nd support frame of the said 2nd expansion | deployment member, the said 2nd rotation part, and these 2nd connection beam were integrally formed with the flat-plate elastic-plastic body.   The plurality of first connection beams and the plurality of second connection beams are arranged so that a distance that the second rotating part moves in a direction away from the second support frame is maximized. The expanded structure according to any one of the above.   The unfolding drive unit is connected to the second support frame and has a disk-shaped rotary plate provided with a convex rotary shaft at the center, and a drive unit that rotationally drives the rotary plate around the rotary shaft. The deployment structure according to any one of claims 1 to 5, wherein the development structure is included.   The unfolded structure according to claim 6, further comprising: a rotation stop unit that stops the rotation of the rotating plate when the distance that the second rotating unit moves in the direction away from the second support frame is maximized. .   The first rotating part and the first support frame are connected by three first connecting beams, and the second rotating part and the second support frame are connected by three second connecting beams. 8. The expanded structure according to any one of 1 to 7.   The rotation resistance member is fitted to a convex portion provided on one of the first rotating portion and the second rotating portion, and the convex portion provided on the other of the first rotating portion and the second rotating portion. The expansion | deployment structure of any one of Claim 1-8 comprised by the recessed part or opening part to do.   A notch is provided near the end of the first connecting beam connected to the first rotating part, and a notch is provided near the end of the second connecting beam connected to the second rotating part. Item 10. The expanded structure according to any one of Items 1 to 9. An impact absorbing portion in which a plurality of the deployment structures according to any one of claims 1 to 10 are arranged in a planar shape or in parallel;
Information acquisition means for acquiring information for identifying the collision position of the collision object;
When the collision is detected or the collision is predicted to be unavoidable based on the information acquired by the information acquisition unit, the first expansion of the expansion structure installed at the specified collision position A control unit that controls each of the deployment driving units corresponding to each of the plurality of deployment structures so as to deploy the member and the second deployment member;
Including shock absorber.

Images