Impact absorbing device

Abstract

The present application has: a first impact absorbing member provided between a frame forming a skeleton of a vehicle and an outer side structure on an outer side of the frame in the vehicle, the first impact absorbing member being configured to deform preferentially to the frame in an impacted state in which the outer side structure is displaced or deformed toward the frame side due to an impact load on the outer side structure; a second impact absorbing member provided between the frame and the outer side structure; and a switching section capable of switching a provided state of the second impact absorbing member between: a first provided state in which the second impact absorbing member avoids the impact load in the impacted state, and a second provided state in which the second impact absorbing member deforms together with the first impact absorbing member while bearing the impact load in the impacted state.

Description

Technical Field

[0001] This invention relates to an impact absorption device. Background Technology

[0002] Traditionally, car bumpers housed deformable crumple zones (also known as energy-absorbing buffers) as impact-absorbing devices, located between the vehicle's frame (also called chassis) and the bumper beam. During a collision, the crumple zone is compressed and flattened by the impact load in the longitudinal direction of the vehicle, thereby absorbing the energy generated by the collision and suppressing frame deformation.

[0003] Relatedly, Patent Document 1 discloses an adaptive disintegration device for impact energy. The adaptive disintegration device for impact energy disclosed in Patent Document 1 is configured to cause a deformable member to gradually taper through impact energy, thereby disintegrating the impact energy. The adaptive disintegration device for impact energy adjusts the taper of the deformable member by changing the number of plates constituting the conical surface that deforms the member using a driver device, thereby making the amount of impact energy disintegrated variable.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Publication No. 2013-505169 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] In order to reliably protect occupants even in high-energy collisions such as high-speed vehicle crashes, it is necessary to absorb large collision energy. Therefore, high strength of the impact absorber is preferred. In this case, the frame deforms together with the impact absorber to absorb the impact. On the other hand, in light collisions with lower energy, such as low-speed vehicle crashes, when the impact absorber is strong, its deformation requires a large impact load. As a result, the impact absorber may not deform sufficiently and thus fail to absorb the collision energy adequately. Consequently, the frame may deform, and the impact may be transmitted to the occupants. When the frame is affected even in a light collision, simply replacing the bumper beam and the impact absorber is insufficient, which is inconvenient from a maintainability (repairability) point of view. Furthermore, in this case, there is also the disadvantage of reduced vehicle value if there is a history of accidents. Therefore, in the case of low collision energy, it is preferable to be able to adjust the strength of the impact absorber so that it deforms even with small collision energy.

[0009] The technology disclosed herein was made in view of the above-mentioned problems, and its object is to provide a technology that can change the intensity of an impact absorbing device used to absorb the collision energy of a vehicle.

[0010] Technical solution

[0011] To solve the above problems, the technology disclosed herein adopts the following configuration. That is, the technology disclosed herein is an impact absorption device, characterized by comprising: a first impact absorption member disposed between a frame forming the skeleton of a vehicle and an outer structure located outside the frame in the vehicle, the first impact absorption member being configured to deform preferentially over the frame in an impact condition where the outer structure is displaced or deformed towards the frame by an impact load; a second impact absorption member disposed between the frame and the outer structure; and a switching unit capable of switching the installation state of the second impact absorption member between: a first installation state in which the second impact absorption member avoids the impact load in the impact condition, and a second installation state in which the second impact absorption member bears the impact load and deforms together with the first impact absorption member in the impact condition.

[0012] The impact absorption device disclosed herein can switch between a first setting state where the second impact absorption member avoids impact loads and a second setting state where the second impact absorption member bears impact loads. Thus, the impact absorption device can switch the intensity of impact load resistance. Therefore, in collisions with high energy, by aligning the second impact absorption member in the second setting state and deforming it together with the first impact absorption member, large impact energy can be absorbed. Conversely, in minor collisions with low energy, by aligning the second impact absorption member in the first setting state and deforming only the first impact absorption member, impact energy can be absorbed. In other words, it can absorb the impact of heavy collisions and, in minor collisions, absorb the impact solely through the first impact absorption member, suppressing impact transmission to the frame and improving vehicle maintainability.

[0013] Furthermore, the impact absorption device of this disclosure may also include: a base portion disposed on the frame to fix the first impact absorption member; a receiving portion formed by an opening in the base portion, the receiving portion receiving the second impact absorption member in the first setting state under the impact condition, allowing the second impact absorption member to move towards the frame side, thereby causing the second impact absorption member to avoid the impact load; and an abutting portion disposed in the base portion, abutting against the second impact absorption member in the second setting state under the impact condition, restricting the movement of the second impact absorption member towards the frame side, thereby causing the second impact absorption member to bear the impact load.

[0014] Alternatively, in the impact absorption device described above, the abutting portion can be formed as part of the base portion in a manner that surrounds the receiving portion, and the switching portion can switch between the first setting state and the second setting state by displacing the second impact absorption member relative to the receiving portion.

[0015] Alternatively, in the above-described impact absorption device, the switching part displaces the abutting part relative to the receiving part, and the second impact absorption member is switched to the first setting state by positioning the abutting part at a first position that allows the second impact absorption member to enter the receiving part, and the second impact absorption member is switched to the second setting state by positioning the abutting part at a second position that prevents the second impact absorption member from entering the receiving part.

[0016] Alternatively, in the impact absorbing device disclosed herein, the cross-section of the second impact absorbing member, i.e., the cross-section orthogonal to the direction from the outer structure side toward the frame side, is such that the size of the cross-section of the receiving part is smaller at the end on the frame side and gradually increases towards the outer structure side, while the size of the cross-section of the receiving part becomes larger at the end on the outer structure side.

[0017] Alternatively, in the impact absorption device disclosed herein, a vulnerable portion is formed in the base portion, which abuts against the second impact absorption member in the first setting state under the impact condition, and breaks under the load of the second impact absorption member, thereby opening the receiving portion.

[0018] Alternatively, in the impact absorption device disclosed herein, the end of the second impact absorption member opposite to the base portion may include: an abutting region that abuts the vulnerable portion when the second impact absorption member is at least in the first setting state under the impact condition; and a non-abutting region that does not abut the base portion.

[0019] Alternatively, in the impact absorption device disclosed herein, both the first impact absorption member and the second impact absorption member are formed as cylindrical shapes extending from the frame side to the outer structure side, and the second impact absorption member is disposed inside the first impact absorption member.

[0020] Alternatively, in the impact absorption device of this disclosure, the outer peripheral surface of the second impact absorption member is formed with a protrusion protruding toward the first impact absorption member, the protrusion engaging with the inner peripheral surface of the first impact absorption member, thereby holding the second impact absorption member on the first impact absorption member.

[0021] Alternatively, in the above-described impact absorption device, when the second impact absorption member is in the second setting state under the impact condition, the protrusion guides the first impact absorption member in a manner that causes the first impact absorption member to bend along the second impact absorption member.

[0022] Alternatively, in the impact absorption device disclosed herein, when the second impact absorption member is in the second setting state under the impact condition, the first impact absorption member and the second impact absorption member may be set in a manner in which the timing of the start of deformation of the first impact absorption member is different from the timing of the start of deformation of the second impact absorption member.

[0023] Alternatively, in the above-described impact absorption device, the end of the first impact absorption member on the outer structure side may be closer to the outer structure side than the end of the second impact absorption member on the outer structure side.

[0024] Alternatively, in the impact absorption device of this disclosure, the second impact absorption member extends such that one end is connected to the frame and the other end is connected to the outer structure. One of the frame-side connection portion, which is the connection between the second impact absorption member and the frame, and the outer connection portion, which is the connection between the second impact absorption member and the outer structure, can be disconnected by the switching portion. When the second impact absorption member is in the first setting state under impact conditions, the connection between the frame-side connection portion and the outer connection portion is disconnected by the switching portion, thereby allowing the second impact absorption member to avoid the impact load. When the second impact absorption member is in the second setting state under impact conditions, the connection between the frame-side connection portion and the outer connection portion is maintained, thereby allowing the second impact absorption member to bear the impact load.

[0025] Invention Effects

[0026] According to this disclosure, the strength of an impact-absorbing device used to absorb the collision energy of a vehicle can be changed. Attached Figure Description

[0027] Figure 1 This is a top view showing the installation state of the impact absorption device according to Embodiment 1.

[0028] Figure 2 This is a perspective view schematically showing the impact absorption device of Embodiment 1.

[0029] Figure 3 This is a schematic cross-sectional view of the impact absorption device according to Embodiment 1.

[0030] Figure 4 This is a perspective view of the base portion of Embodiment 1.

[0031] Figure 5 This is a front view showing the relationship between the second impact absorbing member and the switching unit when the second impact absorbing member is in the first setting state under non-collision conditions in Embodiment 1.

[0032] Figure 6 This is a front view showing the relationship between the second impact absorbing member and the switching unit when the second impact absorbing member is in the second setting state under non-collision conditions in Embodiment 1.

[0033] Figure 7 This is a front view showing the relationship between the second impact absorbing member and the base portion when the second impact absorbing member is in the first setting state under non-collision conditions in Embodiment 1.

[0034] Figure 8 This is a front view showing the relationship between the second impact absorbing member and the base portion when the second impact absorbing member is in the second setting state under non-collision conditions in Embodiment 1.

[0035] Figure 9 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in the non-collision condition in Embodiment 1.

[0036] Figure 10 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state in the non-collision condition in Embodiment 1.

[0037] Figure 11 This is a functional block diagram of the control unit in Embodiment 1.

[0038] Figure 12 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state under impact conditions in Embodiment 1.

[0039] Figure 13 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state under impact conditions in Embodiment 1.

[0040] Figure 14 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in a non-collision condition, as shown in Variation 1 of Embodiment 1.

[0041] Figure 15 This is a perspective view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in a non-collision condition, in a modified example 2 of embodiment 1.

[0042] Figure 16 This is a front view of the base portion of a variation of Embodiment 1, Example 2.

[0043] Figure 17 This is a perspective view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state under the impact condition in a modified example 2 of embodiment 1.

[0044] Figure 18 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in the non-collision condition in Embodiment 2.

[0045] Figure 19 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state in the non-collision condition in Embodiment 2.

[0046] Figure 20 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state under impact conditions in Embodiment 2.

[0047] Figure 21 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state under impact conditions in Embodiment 2.

[0048] Figure 22 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in a non-collision condition, as shown in Variation 1 of Embodiment 2.

[0049] Figure 23 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state under the impact condition in a modified example 1 of embodiment 2.

[0050] Figure 24 This is a perspective view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in a non-collision condition, according to a variation 2 of embodiment 2.

[0051] Figure 25 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state in a non-collision condition, as shown in Variation 2 of Embodiment 2.

[0052] Figure 26 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state in a non-collision condition, as shown in Variation 2 of Embodiment 2.

[0053] Figure 27 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state under the impact condition in a modified example 2 of embodiment 2.

[0054] Figure 28 This is a cross-sectional view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state under the impact condition in a modified example 2 of embodiment 2.

[0055] Figure 29 This is a top view showing the state of the impact absorption device when the second impact absorption member is in the first setting state in the non-collision condition in Embodiment 3.

[0056] Figure 30 This is a top view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state in the non-collision state in Embodiment 3.

[0057] Figure 31 This is a top view showing the state of the impact absorbing device when the second impact absorbing member is in the first setting state under the impact condition in Embodiment 3.

[0058] Figure 32 This is a top view showing the state of the impact absorbing device when the second impact absorbing member is in the second setting state under the impact condition in Embodiment 3. Detailed Implementation

[0059] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the various configurations and combinations in each embodiment are merely examples, and appropriate additions, omissions, substitutions, and other modifications to the configuration can be made without departing from the spirit of the invention. This disclosure is not limited to the embodiments, but only to the claims.

[0060] <Implementation Method 1>

[0061] Hereinafter, as Embodiment 1, a scheme for applying the impact absorption device of this disclosure to the front bumper of a vehicle will be described. Figure 1 This is a top view showing the installation state of the impact absorption device 100 according to Embodiment 1. Figure 1 The diagram shows the state of the impact absorption device 100 in the condition before a vehicle collision (hereinafter, the non-collision condition). Unless otherwise specified, the front-back and left-right directions in the following description refer to the front-back and left-right directions of the vehicle. Figure 1 The arrows in the diagram indicate the vehicle's forward, backward, left, and right directions. Figure 1Reference numeral 200 in the accompanying drawings denotes the frame forming the skeleton of the vehicle, namely, the side frames extending in the longitudinal direction. The side frames 200 are arranged one on each side at regular intervals. The interior of the side frames 200 is hollow. Furthermore, reference numeral 300 denotes a bumper beam. The bumper beam 300 is located inside the front bumper, which is situated at the front end (front) of the vehicle. The bumper beam 300 is an example of the "outer structure" of this disclosure. The bumper beam 300 extends laterally in the vehicle (in the width direction of the vehicle) beyond the side frames 200. The strength of the bumper beam 300 is set to be lower than that of the side frames 200. Figure 1 As shown, the impact-absorbing device 100 of this embodiment is disposed between the side frame 200 and the bumper beam 300. The impact-absorbing devices 100 are arranged one on each side, connecting the left and right side frames 200 to the bumper beam 300. During a frontal collision of the vehicle, the impact-absorbing device 100 absorbs the impact load from the front via the bumper beam 300. At this time, the impact-absorbing device 100 deforms preferentially over the side frame 200 to absorb the collision energy, thereby suppressing frame deformation. Here, as... Figure 1 As shown, the direction from the bumper beam 300 side toward the side frame 200 side (in this example, rearward) is called the load direction. The load direction is the direction in which the load acts on the impact absorption device 100 during a vehicle collision.

[0062] It should be noted that the location of the impact-absorbing device disclosed herein is not limited to the interior of the front bumper. The impact-absorbing device can be disposed between the vehicle frame and an outer structure located outside the frame within the vehicle. For example, the impact-absorbing device can be disposed inside the rear bumper located at the rear end (rear) of the vehicle. In this case, the impact-absorbing device absorbs the impact load from the rear during a rear-end collision, prior to frame deformation, thereby absorbing the collision energy. Furthermore, the impact-absorbing device can be disposed between the frame and a mudguard located on the side of the vehicle, serving as an outer structure. In this case, the impact-absorbing device absorbs the lateral impact load during a side collision (side impact), prior to frame deformation, thereby absorbing the collision energy.

[0063] Figure 2 This is a schematic perspective view of the impact absorption device 100. Figure 3 This is a schematic cross-sectional view showing the impact absorption device 100. Figure 2 and Figure 3 The middle figure shows the state of the second impact-absorbing member, indicated by reference numeral 2, in the first configuration state described later, under non-collision conditions. Furthermore, in Figure 2 and Figure 3 The simplified map shows the components of the impact absorption device 100. For example... Figure 2 and Figure 3As shown, the impact absorption device 100 includes a first impact absorption member 1, a second impact absorption member 2, a switching unit 3, a control unit 4, and a base unit 5.

[0064] like Figure 3 As shown, the first impact-absorbing member 1 and the second impact-absorbing member 2 are both disposed between the side frame 200 and the bumper beam 300, and are formed into a cylindrical shape extending from the side frame 200 side to the bumper beam 300 side (that is, extending in the front-rear direction). Furthermore, the second impact-absorbing member 2 is disposed inside the first impact-absorbing member 1. The first impact-absorbing member 1 and the second impact-absorbing member 2 are coaxially arranged.

[0065] The first impact-absorbing member 1 is a metal member comprising a first cylindrical main body 11 in the shape of a square tube and a first cover wall 12 that closes one end (front end) of the cylindrical main body. For example... Figure 3 As shown, the front end of the first cover wall portion 12, i.e., the front end of the first impact-absorbing member 1, is fixed to the bumper beam 300. The base portion 5 is a metal member provided on the side frame 200 in a manner that fixes the other end (rear end) of the first cylindrical main body portion 11. The base portion 5 is formed in the shape of a plate and is fixed to the front end face of the side frame 200. Figure 3 As shown, the front end of the first impact-absorbing member 1 is fixed to the bumper beam 300, and the rear end of the first impact-absorbing member 1 is fixed to the base portion 5 provided on the side frame 200, thereby connecting the side frame 200 and the bumper beam 300 through the first impact-absorbing member 1. The strength of the first impact-absorbing member 1 is set to be lower than the strength of the side frame 200. It should be noted that in this example, the base portion 5 and the side frame 200 are formed as independent components, but the base portion of this disclosure can also be formed as part of the side frame 200. The second impact-absorbing member 2 includes a square cylindrical metal second cylindrical body portion 21, a second cover portion 22 that closes one end (front end) of the second cylindrical body portion 21, and a protrusion 23 that protrudes radially outward from the outer peripheral surface near the front end of the second cylindrical body portion 21. The strength of the second cylindrical body portion 21 is set to be lower than the strength of the side frame 200. The protrusion 23 is an elastic member formed of resin material. The outer periphery of the protrusion 23 is formed into an arc shape with a center on the central axis A2 of the second cylindrical main body 21. Here, as Figure 3 As shown, a recess 13 is formed in the first cylindrical main body portion 11 of the first impact absorbing member 1, which is recessed radially outward. The protrusion 23 of the second impact absorbing member 2 engages with the recess 13 of the first impact absorbing member 1, thereby holding the second impact absorbing member 2 within the first impact absorbing member 1. It should be noted that the protrusion 23 is in a state where it can rotate about the central axis A1 while embedded in the recess 13.

[0066] Figure 4This is a perspective view of the base portion 5. For example... Figure 4 As shown, a receiving portion 6, which is a hole with a rectangular cross-section, is formed in the base portion 5. The cross-section of the receiving portion 6, which is orthogonal to the load direction, is similar in shape to the cross-section of the second impact absorbing member 2, which is orthogonal to the load direction of the second cylindrical main body portion 21, but is larger than the cross-section of the second cylindrical main body portion 21. The receiving portion 6 communicates with the internal space 210 of the side frame 200. In addition, a hole forming portion 7 is provided in the base portion 5. The hole forming portion 7 is a part of the base portion 5, that is, the part that defines the receiving portion 6 by surrounding it. In this embodiment, the hole forming portion 7 corresponds to an example of the "abutment portion" in this disclosure.

[0067] Figure 5 This is a front view showing the relationship between the second impact absorbing member 2 and the switching unit 3 when the second impact absorbing member 2 is in its first setting state under non-collision conditions. Furthermore, Figure 6 This is a front view showing the relationship between the second impact absorbing member 2 and the switching unit 3 when the second impact absorbing member 2 is in its second setting state under non-collision conditions. Figure 5 and Figure 6 The diagram shows the state of the second impact-absorbing member 2 and the switching part 3 as viewed from the bumper beam 300 side along the load direction. It should be noted that... Figure 5 and Figure 6 The first impact absorbing member 1 and the protrusion 23 are omitted from the illustration.

[0068] Switching unit 3 is used to set the second impact absorbing member 2 in the following states: Figure 5 The first setting state shown in the figure and Figure 6 The device shown in the diagram switches between two different settings. In this example, the switching unit 3 rotates the second impact-absorbing member 2, which is in the first setting state, 90° about the central axis A2 in the first rotation direction R1, thus setting the second impact-absorbing member 2 to the second setting state. The switching unit 3 also rotates the second impact-absorbing member 2, which is in the second setting state, 90° about the central axis A2 in the second rotation direction R2, which is opposite to the first rotation direction R1, thus setting the second impact-absorbing member 2 to the first setting state. Figure 3 , Figure 5 as well as Figure 6 As shown, the switching unit 3 includes a support plate 31, a rotary table 32, a driver 33, and a transmission unit 34. Figure 3As shown, the support plate 31 is a plate-shaped member fixed to the base portion 5 in a manner that overlaps with the front of the base portion 5. Furthermore, the rotary table 32 is rotatable about the central axis A1 relative to the support plate 31. A through hole 311 is formed in the support plate 31 for the insertion of the second impact-absorbing member 2. The size and shape of the first cylindrical main body portion 11 are set such that the second impact-absorbing member 2 can move relative to the support plate 31 in the load direction and the second impact-absorbing member 2 can rotate relative to the support plate 31 about the central axis A2.

[0069] like Figure 3 As shown, the rotary table 32 is a component supported by the support plate 31 in such a way that it overlaps with the front of the support plate 31, allowing the second impact-absorbing member 2 to rotate about the central axis A2. A through hole 321 is formed in the rotary table 32 for the second impact-absorbing member 2 to be inserted. The through hole 321 is sized and shaped to allow the second impact-absorbing member 2 to move relative to the rotary table 32 in the load direction, while restricting the rotation of the second impact-absorbing member 2 relative to the rotary table 32 about the central axis A1. By allowing relative rotation of the second impact-absorbing member 2 relative to the support plate 31 and restricting relative rotation of the second impact-absorbing member 2 relative to the rotary table 32, the second impact-absorbing member 2 can rotate together with the rotary table 32 about the central axis A1.

[0070] like Figure 5 and Figure 6 As shown, the actuator 33 includes a drive unit 331 and a piston 332 held in the drive unit 331. The drive unit 331 is an electric actuator driven by a solenoid, and is driven by the control unit 4 to move the piston 332 forward and backward. The driving method of the drive unit 331 is not limited to a solenoid. The drive unit 331 can also be driven by a motor. In addition, as disclosed in U.S. Patent Application Publication No. 2003 / 0167959, the drive unit 331 can utilize the combustion energy of gunpowder to move the piston 332. The transmission unit 34 is a linkage mechanism connecting the rotary table 32 and the actuator 33, which converts the forward and backward movement of the piston 332 into rotational movement and transmits it to the rotary table 32, thereby causing the rotary table 32 to rotate. The transmission unit 34 includes a rotor 341 and a rod 342. The rotor 341 is a rotating member configured to rotate about a rotation axis 341a parallel to the load direction and extend in a direction orthogonal to the rotation axis 341a. Rod 342 is a rod-shaped component connecting the rotary table 32 and the rotor 341. One end of the rotor 341 is connected to a piston 332, and the other end, which is opposite to the rotating shaft 341a, is rotatably connected to one end of rod 342. The other end of rod 342 is rotatably connected to the rotary table 32.

[0071] By making piston 332 in a position Figure 5 The first state shown in the diagram sets the second impact-absorbing member 2 to its first configuration state. Furthermore, as... Figure 6 As shown, by placing the piston 332 in a second state that protrudes beyond the first state, the second impact-absorbing member 2 is in a second configuration state. Specifically, by driving the drive unit 331, the piston 332 changes from the first state to the second state, thereby transmitting the movement of the piston 332 to the rotary table 32 via the transmission unit 34, causing the rotary table 32 to rotate 90° around the central axis A2 in the first rotation direction R1, thus placing the second impact-absorbing member 2 in the second configuration state. Conversely, by driving the drive unit 331, the piston 332 changes from the second state to the first state, thereby causing the rotary table 32 to rotate 90° around the central axis A2 in the second rotation direction R2, thus placing the second impact-absorbing member 2 in the first configuration state.

[0072] Figure 7 This is a front view showing the relationship between the second impact absorbing member 2 and the base portion 5 when the second impact absorbing member 2 is in its first setting state under non-collision conditions. Furthermore, Figure 8 This is a front view showing the relationship between the second impact absorbing member 2 and the base portion 5 when the second impact absorbing member 2 is in its second setting state under non-collision conditions. Figure 7 and Figure 8 The middle image shows the state of the second impact-absorbing member 2 and the base portion 5 as viewed from the bumper beam 300 side along the load direction. It should be noted that... Figure 7 and Figure 8 The illustrations of the first impact-absorbing member 1 and the switching unit 3 are omitted. Furthermore, Figure 9 This is a cross-sectional view showing the state of the impact absorbing device 100 when the second impact absorbing member 2 is in its first setting state under non-collision conditions. Figure 9 In the middle, the diagram shows the relationship with Figure 7 The section corresponding to section AA. Furthermore, Figure 10 This is a cross-sectional view showing the state of the impact absorbing device 100 when the second impact absorbing member 2 is in its second setting state under non-collision conditions. Figure 10 In the middle, the diagram shows the relationship with Figure 8 The section corresponding to the BB section. It should be noted that, in Figure 9 and Figure 10 The illustration of switching unit 3 is omitted in the text.

[0073] like Figure 7 As shown, when viewed from the bumper beam 300 side along the load direction, the second impact-absorbing member 2 (more specifically, the second cylindrical main body 21) in its first configuration state is in a state where it does not overlap with the hole-forming portion 7 and is housed inside the receiving portion 6. That is, in the load direction, the second impact-absorbing member 2 does not overlap with the hole-forming portion 7. Therefore, as... Figure 9As shown, when the second impact-absorbing member 2, which is in the first setting state, is moved in the load direction, the second impact-absorbing member 2 can be received by the receiving part 6 and enter the internal space 210 of the side frame 200. Therefore, when the second impact-absorbing member 2 is in the first setting state, it is allowed to move in the load direction. In contrast, as... Figure 8 As shown, in the second configuration state, when viewed along the load direction, the second impact-absorbing member 2 is not retracted into the receiving portion 6, and a portion of it overlaps with the hole-forming portion 7. That is, the second impact-absorbing member 2 is offset relative to the receiving portion 6, and in the load direction, the second impact-absorbing member 2 is located in front of the hole-forming portion 7, and at least a portion of the second impact-absorbing member 2 (the second cylindrical main body portion 21) overlaps with the hole-forming portion 7. Therefore, as... Figure 10 As shown, when the second impact absorbing member 2, which is in the second setting state, is moved in the load direction, the hole forming portion 7 abuts against the second impact absorbing member 2, thereby bearing the load on the second impact absorbing member 2. Therefore, when the second impact absorbing member 2 is in the second setting state, the movement of the second impact absorbing member 2 in the load direction is restricted.

[0074] The control unit 4 predicts the impact load on the vehicle and controls the switching unit 3 based on the prediction result, thereby causing the switching unit 3 to switch the setting state of the second impact absorbing member 2. Figure 11 This is a functional block diagram of the control unit 4. The control unit 4 includes an information acquisition unit 41, a determination unit 42, and a switching control unit 43.

[0075] During vehicle operation, the information acquisition unit 41 acquires information needed to predict impact loads from various sensors equipped on the vehicle. Specifically, the information acquisition unit 41 acquires driving information indicating the vehicle's driving state from sensors such as vehicle speed sensor, acceleration sensor, and yaw rate sensor. Furthermore, the information acquisition unit 41 acquires operational information indicating how to drive the vehicle from sensors such as throttle sensor, throttle position sensor, brake sensor, and steering sensor. Additionally, the information acquisition unit 41 acquires obstacle information, which indicates the state of obstacles such as opposing vehicles, from onboard cameras and millimeter-wave radar.

[0076] The determination unit 42 determines, based on the information acquired by the information acquisition unit 41, whether the first or second installation state is appropriate for the installation state of the second impact absorbing member 2. More specifically, the determination unit 42 calculates the magnitude of the impact load experienced by the vehicle assuming a collision, based on driving information, operation information, and obstacle information. Furthermore, based on the calculated impact load (hereinafter, predicted impact load), it determines the appropriate installation state for the second impact absorbing member 2. The determination unit 42 determines the first installation state is appropriate when the predicted impact load is small, i.e., a minor collision is predicted, and determines the second installation state is appropriate when the predicted impact load is large, i.e., a severe collision is predicted. Specifically, the determination unit 42 determines the first installation state is appropriate when the predicted impact load is less than a predetermined value, and determines the second installation state is appropriate when the predicted impact load is greater than or equal to the predetermined value. Here, the predetermined value (hereinafter, predetermined impact value) is mainly determined based on the strength of the side frame 200, the first impact absorbing member 1, and the second impact absorbing member 2. In this example, the specified impact value is determined as follows: if the impact load is less than the specified impact value, the collision energy can be completely absorbed by the deformation of the first impact absorbing member 1, the second impact absorbing member 2, and the first impact absorbing member 1 in the side frame 200; if the impact load is greater than or equal to the specified impact value, the collision energy cannot be completely absorbed by the deformation of the first impact absorbing member 1 alone. That is to say, a collision less than the specified impact value is called a minor collision. However, the above method for determining the specified impact value is an example and is not intended to limit the content of this disclosure.

[0077] The switching control unit 43 controls the drive unit 331 of the driver 33 based on the determination result of the determination unit 42, thereby switching the setting state of the second shock-absorbing member 2 between a first setting state and a second setting state. Specifically, when the determination unit 42 determines that the first setting state is appropriate, the switching control unit 43 drives the drive unit 331 of the driver 33 in the first state by causing the piston 332 to drive the drive unit 331 of the driver 33, thus setting the second shock-absorbing member 2 to the first setting state. Conversely, when the determination unit 42 determines that the second setting state is appropriate, the switching control unit 43 drives the drive unit 331 of the driver 33 in the second state by causing the piston 332 to drive the drive unit 331 of the driver 33, thus setting the second shock-absorbing member 2 to the second setting state. The processing of the information acquisition unit 41, the determination unit 42, and the switching control unit 43 is continuously and repeatedly executed during vehicle operation. For example, during vehicle operation, if the predicted impact load is less than the predetermined impact value due to the vehicle's low speed, the second impact absorbing member 2 maintains its first setting state. If the predicted impact load is greater than or equal to the predetermined impact value due to the vehicle accelerating to a high speed, the second impact absorbing member 2 switches to its second setting state. However, the processing of the control unit 4 is not limited to this. That is, the above processing does not need to be performed continuously during vehicle operation. For example, during normal driving, the second impact absorbing member 2 can be set to the first setting state. When the determination unit 42 determines, based on information from the information acquisition unit 41, that a collision is unavoidable (the pre-collision stage), it selects whether to maintain the first setting state or switch to the second setting state based on the magnitude of the predicted impact load.

[0078] The control unit 4 is configured to include a CPU (Central Processing Unit) and a memory. The control unit 4 can be a digital circuit or an analog circuit. It should be noted that the control unit 4 is not a necessary component of the shock absorption device disclosed herein. For example, an ECU (Engine Control Unit) in a vehicle can function as the control unit 4. Furthermore, the control unit 4 can also be configured to include the aforementioned sensors. For example, the control unit 4 can include a speed sensor.

[0079] [Impact Absorption]

[0080] The absorption of collision energy during a vehicle collision by the impact absorption device 100 will be explained below. In the following explanation, it is assumed that in the event of a frontal collision, the bumper beam 300 is displaced or deformed towards the side frame 200 (i.e., in the load direction) by the impact load on the bumper beam 300 (hereinafter, the impact condition). In the impact condition, by displacing or deforming the bumper beam 300 towards the side frame 200, the impact load in the load direction is applied to the impact absorption device 100.

[0081] Figure 12 This is a cross-sectional view showing the state of the impact-absorbing device 100 when the second impact-absorbing member 2 is in its first setting state under impact conditions. Figure 12 In the middle, the diagram shows the relationship with Figure 9 The corresponding cross section. Figure 13 This is a cross-sectional view showing the state of the impact-absorbing device 100 when the second impact-absorbing member 2 is in its second configuration state under impact conditions. Figure 13 In the middle, the diagram shows the relationship with Figure 10 The corresponding cross section.

[0082] First, the absorption of impact energy in collisions with relatively small impact loads (hereinafter, light collisions) will be explained. It should be noted that the impact load here is the magnitude that only deforms the first impact-absorbing member 1. However, this excludes very light impacts where even the first impact-absorbing member 1 does not deform. As described above, in the case of a light collision, in the non-impact state, the switching unit 3 sets the second impact-absorbing member 2 to a first setting state, thereby achieving... Figure 9 The state shown in the image.

[0083] like Figure 9 As shown, the front end of the first impact-absorbing member 1 is fixed to the bumper beam 300. Therefore, in the event of a collision, the bumper beam 300 displaces or deforms towards the side frame 200, thereby subjecting the first impact-absorbing member 1 to an impact load in the load direction. At this time, the rear end of the first impact-absorbing member 1 is fixed to the base portion 5 provided on the side frame 200. Therefore, the first impact-absorbing member 1 does not avoid the impact load received from the bumper beam 300 and bears the impact load. Furthermore, the impact load also acts on the side frame 200 via the first impact-absorbing member 1. Here, the strength of the first impact-absorbing member 1 is set to be lower than the strength of the side frame 200, causing the first impact-absorbing member 1 to deform preferentially over the side frame 200. As a result, as Figure 12 As shown, the first impact-absorbing member 1 is deformed by being flattened by the side frame 200 and the bumper beam 300. Therefore, the impact energy is absorbed only through the deformation of the first impact-absorbing member 1, while the deformation of the side frame 200 is suppressed.

[0084] Under impact conditions, by displacing or deforming the bumper beam 300 towards the side frame 200, the impact load in the load direction is also applied to the second impact-absorbing member 2 disposed between the side frame 200 and the bumper beam 300. In contrast, as... Figure 9 As shown, when the second impact-absorbing member 2 is in the first setting state, the receiving part 6 can receive the second impact-absorbing member 2. Therefore, as Figure 12As shown, the second impact-absorbing member 2, subjected to an impact load in the load direction, is received by the receiving part 6 and enters the internal space 210 of the side frame 200. The second impact-absorbing member 2 is allowed to move in the load direction, thus avoiding the impact load and preventing deformation.

[0085] As described above, in the event of a minor impact with relatively low energy, the impact absorbing device 100 absorbs the impact energy by deforming only the first impact absorbing member 1 in the first impact absorbing member 1 and the second impact absorbing member 2, thereby suppressing the deformation of the side frame 200. Therefore, only the top part (i.e., the part that is further out (front) than the side frame 200) needs to be replaced from the base part 5, without having a substantial impact on the side frame 200.

[0086] Next, the absorption of impact energy in collisions with large impact loads (hereinafter, heavy collisions) will be explained. It should be noted that the impact load here is at least large enough to deform both the first impact-absorbing member 1 and the second impact-absorbing member 2 together. As described above, in the case of a heavy collision, in the non-impact state phase, the switching unit 3 sets the second impact-absorbing member 2 to a second setting state, thereby placing it in... Figure 10 The state shown in the image.

[0087] like Figure 13 As shown, similar to a minor collision, the first impact-absorbing member 1 is deformed by being flattened and sandwiched between the side frame 200 and the bumper beam 300. Thus, the impact energy is absorbed through the deformation of the first impact-absorbing member 1.

[0088] Here, as Figure 10 As shown, when the second impact-absorbing member 2 is in the second setting state, when the second impact-absorbing member 2 is moved in the load direction, the hole forming portion 7 abuts against the second impact-absorbing member 2. Therefore, the second impact-absorbing member 2, which is subjected to impact load in the load direction, is borne by the hole forming portion 7. The movement of the second impact-absorbing member 2 in the load direction is restricted, so the second impact-absorbing member 2 does not avoid the impact load and bears the impact load. Here, the strength of the impact-absorbing device 100 when the second impact-absorbing member 2 is in the second setting state is the sum of the strengths of the first impact-absorbing member 1 and the second impact-absorbing member 2. The strength of the impact-absorbing device 100 at this time is set to be the same as or lower than the strength of the side frame 200. That is, when the second impact-absorbing member 2 is in the second setting state, the first impact-absorbing member 1 and the second impact-absorbing member 2 deform preferentially over the side frame 200. Furthermore, in the case of a larger impact load, the side frame 200 is also deformed to absorb the impact as a whole. Therefore, in Figure 13 The diagram shows the state of the first impact absorbing member 1 and the second impact absorbing member 2 under compression deformation. However, depending on the magnitude of the impact load, the side frame 200 can also be deformed to absorb the impact.

[0089] As described above, in the event of a heavy collision with high impact energy, the impact absorbing device 100 absorbs the impact energy by deforming at least both the first impact absorbing member 1 and the second impact absorbing member 2. However, if the impact absorbing device 100 alone fails to absorb all the impact energy, the side frame 200 may sometimes be deformed to absorb the remaining impact energy.

[0090] [Function / Effect]

[0091] As described above, the impact absorbing device 100 of this embodiment includes a first impact absorbing member 1 and a second impact absorbing member 2 disposed between the side frame 200 and the bumper beam 300, as well as a switching unit 3. Furthermore, the first impact absorbing member 1 is configured to deform preferentially over the side frame 200 under impact conditions. Moreover, the switching unit 3 can switch the installation state of the second impact absorbing member 2 between a first installation state in which the second impact absorbing member 2 avoids impact load under impact conditions, and a second installation state in which the second impact absorbing member 2 bears impact load and deforms together with the first impact absorbing member under impact conditions.

[0092] Here, in order to more reliably protect occupants even in heavy collisions with high impact energy, it is preferable that the impact absorber 100 has high strength so as to absorb large impact energy. On the other hand, in light collisions with low impact energy, when the impact absorber 100 has high strength, its deformation requires a large impact load, which may result in the impact absorber 100 not deforming sufficiently and thus not absorbing enough impact energy. As a result, the side frame 200 may deform, and the impact may be transmitted to the occupants. Therefore, in light collisions, from the viewpoint of vehicle maintainability and occupant protection, it is preferable that the impact absorber 100 has low strength so that even small impact energy can be absorbed by the deformation of the impact absorber 100.

[0093] In contrast, the impact absorbing device 100 can switch the setting state of the second impact absorbing member 2 between a first setting state in which the second impact absorbing member 2 avoids impact loads and a second setting state in which the second impact absorbing member 2 bears impact loads. Thus, the impact absorbing device 100 can switch the intensity of its impact load resistance. Accordingly, in a heavy collision, by pre-setting the second impact absorbing member 2 to the second setting state to increase its strength, it can absorb a larger amount of collision energy. Conversely, in a minor collision, by setting the second impact absorbing member 2 to the first setting state to decrease its strength, it can absorb a smaller amount of collision energy and suppress the transmission of impact to the side frame 200. As a result, it can reliably protect occupants from impacts caused by collisions and suppress deformation of the side frame 200, improving the maintainability of the vehicle.

[0094] Furthermore, the impact absorption device 100 of this embodiment includes: a base portion 5, disposed on a side frame 200, for fixing the first impact absorption member 1; a receiving portion 6, with an opening in the base portion 5; and a hole forming portion 7, disposed on the base portion 5. In addition, the receiving portion 6 receives the second impact absorption member 2 in its first setting state under impact conditions, allowing the second impact absorption member 2 to move towards the side frame 200. Furthermore, the hole forming portion 7 abuts against the second impact absorption member 2 in its second setting state under impact conditions, restricting the movement of the second impact absorption member 2 towards the side frame 200. Thus, when the second impact absorption member 2 is in its first setting state, it can avoid impact loads, and when the second impact absorption member 2 is in its second setting state, it can withstand impact loads. Furthermore, since the first impact absorption member 1 is fixed to the base portion 5, the fixing strength of the first impact absorption member 1 is ensured, and even when the impact load acts in a direction offset from the load direction, the first impact absorption member 1 can be appropriately deformed.

[0095] Furthermore, in the impact absorption device 100 of this embodiment, the hole forming portion 7 is formed as part of the base portion 5 in a manner that surrounds the receiving portion 6. Moreover, the switching portion 3 switches between a first setting state where the receiving portion 6 can accept the second impact absorption member 2 and a second setting state where the hole forming portion 7 restricts the movement of the second impact absorption member 2 towards the side frame 200 by rotating the second impact absorption member 2 relative to the receiving portion 6. Thus, the setting state of the second impact absorption member 2 can be switched between the first and second setting states. It should be noted that in this example, the setting state is switched by rotating the second impact absorption member 2 relative to the receiving portion 6, but this disclosure is not limited to rotation. For example, the switching portion 3 could switch the setting state of the second impact absorption member 2 by moving the second impact absorption member 2 parallel to the receiving portion 6. That is, the switching portion 3 can switch the setting state of the second impact absorption member 2 by displacing the second impact absorption member 2 relative to the receiving portion 6. It should be noted that in this specification, displacement refers to a change in position, including parallel movement and rotation.

[0096] Furthermore, in the impact absorption device 100 of this embodiment, both the first impact absorption member 1 and the second impact absorption member 2 are formed as cylindrical sections extending from the side frame 200 side to the bumper beam 300 side, and the second impact absorption member 2 is disposed inside the first impact absorption member 1. Therefore, by disposing of the second impact absorption member 2 inside the first impact absorption member 1, space can be saved. However, this disclosure is not limited to this; the first impact absorption member and the second impact absorption member may also be disposed side-by-side.

[0097] Furthermore, in the impact absorption device 100 of this embodiment, a protrusion 23 protruding toward the first impact absorption member 1 is formed on the outer peripheral surface of the second impact absorption member 2. By engaging the protrusion 23 with the inner peripheral surface of the first impact absorption member 1, the second impact absorption member 2 is held in place of the first impact absorption member 1. This ensures the retention strength of the second impact absorption member 2.

[0098] Moreover, such as Figure 13 As shown, when the second impact-absorbing member 2 is in its second configuration state under impact conditions, the protrusion 23 guides the first impact-absorbing member 1 to bend along the second impact-absorbing member 2. This maintains the deformation of the first impact-absorbing member 1 along the load direction, thus enabling appropriate absorption of the collision energy achieved by the first impact-absorbing member 1. It should be noted that the protrusion is not a necessary component of this disclosure.

[0099] Here, as Figure 10 As shown, in the second setting state, the rear end of the second impact absorbing member 2 abuts against the hole forming portion 7 formed in the base portion 5. At this time, when the distance from the base portion 5 to the front end of the first impact absorbing member 1 is set as d1, and the distance from the base portion 5 to the front end of the second impact absorbing member 2 is set as d2, as... Figure 10As shown, d1>d2. That is, the end of the first impact absorbing member 1 on the bumper beam 300 side is closer to the bumper beam 300 side than the end of the second impact absorbing member 2 on the bumper beam 300 side. Therefore, when the second impact absorbing member 2 is in its second configuration state under impact conditions where the bumper beam 300 is displaced or deformed towards the side frame 200 by the impact load, firstly, the first impact absorbing member 1, which is closer to the bumper beam 300, begins to deform, and then the second impact absorbing member 2 begins to deform. That is, the timing of the deformation of the first impact absorbing member 1 and the second impact absorbing member 2 is different. Generally, material deformation requires a large load at its initial timing, but once deformation begins, a large load is not required during continued deformation. Therefore, assuming that the first impact absorbing member 1 and the second impact absorbing member 2 are configured such that the timing of the deformation of the first impact absorbing member 1 and the second impact absorbing member 2 begins simultaneously, a large impact load is required to make the deformation of the first impact absorbing member 1 and the second impact absorbing member 2 begin simultaneously. In contrast, in the impact absorption device 100, by differentiating the timing of the deformation of the first impact absorption member 1 from that of the second impact absorption member 2, the deformation of both members becomes easier to initiate. As a result, collision energy can be absorbed more reliably, and the suppression of deformation of the side frame 200 and the protection of the occupants can be performed more reliably. It should be noted that in this example, the first impact absorption member 1 is configured to deform before the second impact absorption member 2, but it is also possible for the second impact absorption member 2 to deform before the first impact absorption member 1. That is, the timing of the deformation of the first impact absorption member 1 can be different from that of the second impact absorption member 2. However, this disclosure is not limited to this, and the first and second impact absorption members can also be configured to deform simultaneously.

[0100] Furthermore, the switching unit disclosed herein is not limited to the above-described solution. For example, it may be configured such that: during normal driving, a force is applied to the second shock-absorbing member in a first setting state or a second setting state using a spring or other elastic force; when a setting state needs to be switched, the setting state is temporarily switched using a solenoid or the like, and then the original setting state is restored by the aforementioned elastic force.

[0101] [Modification of Implementation Method 1]

[0102] Hereinafter, a variation of Embodiment 1 will be described focusing on the differences from the impact absorption device 100. Detailed descriptions of the same components will be omitted as the same reference numerals are used to indicate the same components.

[0103] [Modification 1 of Implementation Method 1]

[0104] Figure 14 This is a cross-sectional view showing the state of the impact absorbing device 100A in a modified example 1 of embodiment 1, when the second impact absorbing member 2A is in the first setting state under non-collision conditions. For example... Figure 14 As shown, in the second impact-absorbing member 2A of the impact-absorbing device 100A of Embodiment 1, in addition to a protrusion 23 that protrudes radially outward from the outer peripheral surface near the front end of the second cylindrical main body 21, there is also a protrusion 24 that protrudes radially outward from the outer peripheral surface near the center of the second cylindrical main body 21. Furthermore, in addition to a recess 13 that engages with the protrusion 23, the first impact-absorbing member 1A of the impact-absorbing device 100A also has a recess 14 that engages with the protrusion 24. By inserting the protrusion 23 into the recess 13 and the protrusion 24 into the recess 14, the second impact-absorbing member 2A is held in place of the first impact-absorbing member 1. This improves the holding strength of the second impact-absorbing member 2A.

[0105] [Modification 2 of Implementation Method 1]

[0106] Figure 15 This is a perspective view showing the state of the impact absorbing device 100B in a modified example 2 of embodiment 1, when the second impact absorbing member 2B is in the first setting state under non-collision conditions. Figure 15 Only the second impact absorbing member 2B and the base portion 5B are shown in the figure. Figure 16 This is a front view of the base portion 5B of a variation of Embodiment 1, Example 2. Figure 15 As shown, in the base portion 5B of the impact absorption device 100B, the receiving portion 6 is not open when there is no collision. Here, Figure 16 Reference numeral L1 in the accompanying drawings is a line (contour projection line) that projects the outline of the rear end of the second impact-absorbing member 2B (i.e., the rear end of the second cylindrical main body 21) in the first setting state onto the base portion 5B. For example... Figure 16 As shown, the portion on L1 of the base portion 5B, which is the portion that abuts against the second cylindrical main body portion 21 of the second impact-absorbing member 2B in the event of an impact, is formed as a fragile portion 51 that is easily broken. The fragile portion 51 is formed as a thin-walled portion 511 in which a part is thinner than the rest. As a result, the fragile portion 51 is easily broken. The fragile portion 51 is formed on the outline projection line L1, so by breaking the fragile portion 51, a receiving portion 6 that can receive the second impact-absorbing member 2B in the first setting state is formed. Figure 17 This is a perspective view showing the state of the impact absorbing device 100B in a modified example 2 of embodiment 1, when the second impact absorbing member 2B is in the first installation state under impact conditions. Figure 17Only the second impact-absorbing member 2B and the base portion 5B are shown in the diagram. In the event of a collision, an impact load in the load direction presses the second impact-absorbing member 2B towards the side frame 200, thereby causing the second impact-absorbing member 2B to come into contact with the vulnerable portion 51 of the base portion 5B. Furthermore, as... Figure 17 As shown, the vulnerable part 51 breaks under the load of the second impact-absorbing member 2B, opening the receiving part 6. Thus, the second impact-absorbing member 2B, subjected to an impact load in the load direction, is received by the receiving part 6 and enters the interior space 210 of the side frame 200. Allowing the second impact-absorbing member 2B to move in the load direction allows it to avoid impact loads and prevent deformation.

[0107] Here, as Figure 15 As shown, the rear end of the second cylindrical main body 21, which is the end opposite the base portion 5B in the second impact absorbing member 2B, includes an abutment region 25 that abuts against the vulnerable portion 51 when the second impact absorbing member 2B is at least in the first setting state under impact conditions, and a non-abutment region 26 that does not abut against the vulnerable portion 51. The non-abutment region 26 is formed by cutting a portion of the rear end of the second cylindrical main body 21 into an arch shape. As a result, the load of the second impact absorbing member 2B is concentrated at the abutment region 25 and the vulnerable portion 51, so the vulnerable portion 51 is prone to breakage.

[0108] <Implementation Method 2>

[0109] Figure 18 This is a cross-sectional view showing the state of the impact absorbing device 100C in the first setting state under non-collision conditions in Embodiment 2. Furthermore, Figure 19 This is a cross-sectional view showing the state of the impact absorbing device 100C in the second setting state when the second impact absorbing member 2 is in a non-collision condition in Embodiment 2. Hereinafter, the impact absorbing device 100C of Embodiment 2 will be described with a focus on the differences from the impact absorbing device 100 of Embodiment 1, and detailed descriptions will be omitted by using the same reference numerals to refer to the same components.

[0110] like Figure 18 and Figure 19As shown, the impact absorption device 100C includes a switching section 3C disposed on the base portion 5 and a piston 8 held in the switching section 3C. The switching section 3C is an electric actuator that is driven by the control section 4, thereby causing the piston 8 to move forward and backward. The switching section 3C is disposed in the internal space 210 of the side frame 200 and mounted on the rear of the base portion 5. The switching section 3C differs from the switching section 3 of the impact absorption device 100 of Embodiment 1 in that it does not displace the second impact absorption member 2 relative to the receiving portion 6, but instead displaces the piston 8 relative to the second impact absorption member 2, thereby switching the setting state of the second impact absorption member 2. By placing the piston 8 in a position Figure 18 The first position shown in the diagram enables the second impact-absorbing member 2 to be in a first setting state. Furthermore, by positioning the piston 8 as shown... Figure 19 The second position, which protrudes beyond the first position as shown, positions the second impact-absorbing member 2 in a second configuration state. In this embodiment, the piston 8 corresponds to an example of the "abutment portion" of this disclosure.

[0111] like Figure 18 As shown, when the second impact-absorbing member 2 is in the first setting state, in the load direction, the second impact-absorbing member 2 is located in front of the hole-forming portion 7 and is in a state where it does not overlap with the hole-forming portion 7. Furthermore, the piston 8, which is in the first position in the load direction, is in a state where it does not overlap with the second impact-absorbing member 2. Therefore, as... Figure 18 As shown, when the second impact-absorbing member 2, which is in the first setting state, is moved in the load direction, the second impact-absorbing member 2 can be received by the receiving part 6 and enter the internal space 210 of the side frame 200. Therefore, when the second impact-absorbing member 2 is in the first setting state, it is allowed to move in the load direction. In contrast, as... Figure 19 As shown, in the second setting state, in the load direction, the second impact absorbing member 2 is located in front of the piston 8, and the piston 8 is in a state of overlap with the second impact absorbing member 2 in the second position. Therefore, when the second impact absorbing member 2 in the second setting state is moved in the load direction, the piston 8 abuts against the second impact absorbing member 2, and the second impact absorbing member 2 is borne by the piston 8. Thus, when the second impact absorbing member 2 is in the second setting state, the movement of the second impact absorbing member 2 in the load direction is restricted.

[0112] In the impact absorption device 100C of Embodiment 2, similarly to Embodiment 1, the control unit 4 predicts the impact load on the vehicle and controls the switching unit 3C based on the prediction result, thereby causing the switching unit 3C to switch the setting state of the second impact absorption member 2. The control unit 4 controls the switching unit 3C in such a way that the second impact absorption member 2 is in a first setting state during a minor collision and in a second setting state during a major collision.

[0113] The following describes the absorption of collision energy during a vehicle collision achieved by the impact absorption device 100C under impact conditions. Figure 20 This is a cross-sectional view showing the state of the impact absorbing device 100C when the second impact absorbing member 2 is in the first setting state under impact conditions in Embodiment 2. Figure 21 This is a cross-sectional view showing the state of the impact absorbing device 100C in Embodiment 2 when the second impact absorbing member 2 is in the second setting state under impact conditions. It should be noted that the behavior of the first impact absorbing member 1 under impact conditions is the same as in Embodiment 1, therefore detailed description is omitted.

[0114] First, such as Figure 20 As shown, when the second impact-absorbing member 2 is in the first setting state, the receiving part 6 can receive the second impact-absorbing member 2. Therefore, as Figure 20 As shown, the second impact-absorbing member 2, subjected to an impact load in the load direction, is received by the receiving part 6 and enters the internal space 210 of the side frame 200. The second impact-absorbing member 2 is allowed to move in the load direction, thus avoiding the impact load and preventing deformation. Therefore, in the case of a minor impact with relatively low energy, the impact-absorbing device 100C absorbs the impact energy by deforming only the first impact-absorbing member 1 in the first impact-absorbing member 1 and the second impact-absorbing member 2, thereby suppressing deformation of the side frame 200.

[0115] Next, as Figure 21 As shown, when the second impact absorbing member 2 is in the second setting state, when the second impact absorbing member 2 is moved in the load direction, the piston 8 abuts against the second impact absorbing member 2. Therefore, the second impact absorbing member 2, which is subjected to an impact load in the load direction, is borne by the piston 8. The movement of the second impact absorbing member 2 in the load direction is restricted, so the second impact absorbing member 2 does not avoid the impact load and bears the impact load. As a result, as Figure 21 As shown, the second impact-absorbing member 2 is bent and deformed by being sandwiched and flattened by the piston 8 and the bumper beam 300. Thus, in the event of a heavy collision with high impact energy, the impact-absorbing device 100C absorbs the impact energy by deforming at least both the first impact-absorbing member 1 and the second impact-absorbing member 2. However, if even this does not completely absorb the impact energy, the side frame 200 is also deformed to absorb the impact energy.

[0116] As described above, in the impact absorption device 100C of this embodiment, the switching unit 3C displaces the piston 8 relative to the second impact absorption member 2, switching the setting state of the second impact absorption member 2 to a first setting state and a second setting state. In this embodiment, the first setting state refers to the state in which the piston 8 is positioned to allow the second impact absorption member 2 to enter the receiving unit 6 in a first position. On the other hand, the second setting state refers to the state in which the piston 8 is positioned to prevent the second impact absorption member 2 from entering the receiving unit 6 in a second position.

[0117] The impact-absorbing device 100C of Embodiment 2 can switch the intensity of its impact load resistance by switching the setting state of the second impact-absorbing member 2. As a result, the impact-absorbing device 100C of Embodiment 2, like that of Embodiment 1, can reliably protect occupants from impacts caused by collisions, and suppress deformation of the side frame 200 in the event of a minor collision, thereby improving the maintainability of the vehicle.

[0118] [Modification of Implementation Method 2]

[0119] Hereinafter, a modified example of Embodiment 2 will be described, focusing on the differences from the impact absorption device 100C. Detailed descriptions will be omitted by referring to the same components with the same reference numerals.

[0120] [Modification 1 of Implementation Method 2]

[0121] Figure 22 This is a cross-sectional view showing the state of the impact absorbing device 100D in a modified example 1 of embodiment 2 when the second impact absorbing member 2D is in the first setting state in the non-collision state. Figure 23 This is a cross-sectional view showing the state of the impact absorbing device 100D when the second impact absorbing member 2D is in the first setting state under the impact condition in Modified Example 1 of Embodiment 2.

[0122] like Figure 22 As shown, in the impact absorption device 100D, the second cylindrical main body 21 of the second impact absorption member 2D is formed in a tapered shape, gradually widening from the side frame 200 side towards the bumper beam 300 side. More specifically, the cross-section of the second cylindrical main body 21 of the second impact absorption member 2D, i.e., the shape of the cross-section orthogonal to the load direction, is smaller at the rear end of the end on the side frame 200 side than the cross-section of the receiving part 6. The shape of the cross-section orthogonal to the load direction gradually increases towards the bumper beam 300 side, and becomes larger at the front end of the end on the bumper beam 300 side than the cross-section of the receiving part 6.

[0123] like Figure 23As shown, when the second impact-absorbing member 2D is in its first setting state under impact conditions, the second impact-absorbing member 2D, subjected to an impact load in the load direction, is received by the receiving part 6 and enters the internal space 210 of the side frame 200. At this time, during the movement of the second impact-absorbing member 2D in the load direction, resistance is generated relative to the movement of the second impact-absorbing member 2D in the load direction by causing the second cylindrical main body 21 to abut against the inner wall of the receiving part 6. The cross-sectional shape of the second cylindrical main body 21 gradually increases towards the bumper beam 300 side, so as the amount of movement of the second impact-absorbing member 2D in the load direction increases, the resistance also increases. When the second impact-absorbing member 2D is in its first setting state, if the impact load is greater than expected, the collision energy cannot be completely absorbed by the deformation of the first impact-absorbing member 1 alone. In this case, the first impact-absorbing member 1 may be completely crushed, and the bumper beam 300 will clamp the first impact-absorbing member 1 and impact the side frame 200 (so-called bottom impact). In contrast, according to the impact absorption device 100D, the resistance generated by the second impact absorption member 2D abutting against the inner wall of the receiving part 6 becomes a brake, thus preventing bottom collisions.

[0124] [Modification 2 of Implementation Method 2]

[0125] Figure 24 This is a perspective view showing the state of the impact absorbing device 100E in a modified example 2 of embodiment 2 when the second impact absorbing member 2E is in the first setting state under non-collision conditions. Figure 24 Only the second impact absorbing member 2E and the base portion 5E are shown in the figure. Figure 25 This is a cross-sectional view showing the state of the impact absorbing device 100E in a modified example 2 of embodiment 2 when the second impact absorbing member 2E is in the first setting state in the non-collision state. Figure 26 This is a cross-sectional view showing the state of the impact absorbing device 100E when the second impact absorbing member 2E is in the second setting state in a non-collision condition, in a modified example 2 of embodiment 2. Figure 27 This is a cross-sectional view showing the state of the impact absorbing device 100E when the second impact absorbing member 2E is in the first setting state under the impact condition in a modified example 2 of embodiment 2. Figure 28 This is a cross-sectional view showing the state of the impact absorbing device 100E when the second impact absorbing member 2E is in the second setting state under the impact condition in a modified example 2 of embodiment 2.

[0126] like Figures 24-28 As shown, in the impact absorption device 100E, a first impact absorption member 1E is disposed inside the second impact absorption member 2E. The first impact absorption member 1E is a metal component. Figure 25As shown, the first impact-absorbing member 1E includes: a square-shaped first cylindrical main body 11 extending from the side frame 200 side towards the bumper beam 300 side; a first cover wall portion 12 blocking one end (front end) of the first cylindrical main body 11; and a protrusion 15 projecting radially outward from the outer peripheral surface near the front end of the first cylindrical main body 11. The front end of the first cover wall portion 12, i.e., the front end of the first impact-absorbing member 1E, is fixed to the bumper beam 300, and the rear end is fixed to a base portion 5E disposed on the side frame 200, thereby connecting the side frame 200 and the bumper beam 300 through the first impact-absorbing member 1E. Figure 24 As shown, the second impact-absorbing member 2E is a metal component, comprising a pair of main body portions 27, 27 having a roughly "U"-shaped cross-section and extending from the side frame 200 side towards the bumper beam 300 side, and a beam 28 connecting the rear ends of the pair of main body portions 27, 27 to each other. A pair of receiving portions 6E, 6E are formed in the base portion 5E, serving as through holes for receiving the pair of main body portions 27, 27 respectively. With the pair of main body portions 27, 27 inserted into the pair of receiving portions 6E, 6E, they are connected in the interior space 210 of the side frame 200 via the beam 28. Furthermore, the front ends of the pair of main body portions 27, 27 are connected to the protrusion 15 of the first impact-absorbing member 1E. It should be noted that the protrusion 15 can be arranged at a distance from the main body portion 27.

[0127] like Figure 25 As shown, when the second impact-absorbing member 2E is in the first setting state, in the load direction, the piston 8 in the first position does not overlap with the second impact-absorbing member 2E. Therefore, when the second impact-absorbing member 2E is in the first setting state, the second impact-absorbing member 2E is allowed to move in the load direction. In contrast, as... Figure 26 As shown, in the second setting state, in the load direction, the second impact absorbing member 2E is located in front of the piston 8, and the piston 8 in the second position overlaps with the second impact absorbing member 2E. Therefore, when the second impact absorbing member 2E is in the second setting state, the movement of the second impact absorbing member 2E in the load direction is restricted.

[0128] like Figure 27 As shown, when the second impact-absorbing member 2E is in its first setting state under impact conditions, it is allowed to move in the load direction, thus avoiding the impact load and deformation. Therefore, in the case of a minor impact with relatively low energy, the impact-absorbing device 100E absorbs the impact energy by deforming only the first impact-absorbing member 1E of the first impact-absorbing member 1 and the second impact-absorbing member 2E, thereby suppressing the deformation of the side frame 200. Figure 28As shown, when the second impact-absorbing member 2E is in its second configuration state under impact conditions, its movement in the load direction is restricted, thus the second impact-absorbing member 2E bears the impact load and deforms under pressure. Therefore, in the event of a heavy impact with high impact energy, the impact-absorbing device 100E absorbs the impact energy by deforming at least both the first impact-absorbing member 1E and the second impact-absorbing member 2E. However, if the impact energy is not completely absorbed even with this method, the side frame 200 is also deformed to absorb the impact energy.

[0129] In the impact-absorbing device 100E of Modification 2 of Embodiment 2, the impact load resistance of the impact-absorbing device 100E can be switched by changing the installation state of the second impact-absorbing member 2E to the first installation state and the second installation state. As a result, similar to the embodiments described above, it can reliably protect occupants from impacts caused by collisions, and suppress deformation of the side frame 200 in the event of a minor collision, improving vehicle maintainability. That is, the technology of this disclosure allows the first impact-absorbing member to be installed inside the second impact-absorbing member.

[0130] <Implementation Method 3>

[0131] Figure 29 This is a top view showing the state of the impact absorbing device 100F in Embodiment 3 when the second impact absorbing member 2F is in the first setting state under non-collision conditions. Furthermore, as... Figure 30 This is a top view showing the state of the impact absorbing device 100F when the second impact absorbing member 2F is in the first setting state in the non-collision state in Embodiment 3. Figure 31 This is a top view showing the state of the impact absorbing device 100F when the second impact absorbing member 2F is in the first setting state under the impact condition in Embodiment 3. Figure 32 This is a top view showing the state of the impact absorbing device 100F when the second impact absorbing member 2F is in the second setting state under impact conditions in Embodiment 3. Hereinafter, the impact absorbing device 100F of Embodiment 3 will be described with a focus on the differences from the impact absorbing device 100 of Embodiment 1, and detailed descriptions will be omitted by using the same reference numerals to refer to the same components.

[0132] like Figure 29As shown, the impact absorbing device 100F of Embodiment 3 includes a pair of left and right second impact absorbing members 2F, 2F. It should be noted that the number of second impact absorbing members 2F is not limited to this; it can be one or more. Each second impact absorbing member 2F is a metal rod-shaped or plate-shaped member whose one end is connected to the side frame 200 via a base portion 5F. The second impact absorbing member 2F extends from the side frame 200 side towards the bumper beam 300 side in an inclined manner relative to the load direction. The other end of the second impact absorbing member 2F is... Figure 29 In the first setting shown, it is not connected to the bumper beam 300. Figure 30 In the second configuration shown, the bumper beam 300 is connected via the switching part 3F. Here, the connection between the second impact absorbing member 2F and the side frame 200 (more specifically, the base part 5F of the side frame 200) is designated as the frame side connection part C1, and the connection between the second impact absorbing member 2F and the bumper beam 300 is designated as the outer side connection part C2.

[0133] The second impact-absorbing component 2F is configured to operate normally during vehicle operation. Figure 30 The second setting state is shown in the figure. Two switching units 3F and two pairs of second impact-absorbing members 2F are respectively provided. The switching unit 3F is as follows... Figure 29 As shown, the second impact-absorbing member 2F is set to the first setting state by disconnecting the outer connecting part C2, as shown. Figure 30 As shown, the second impact-absorbing member 2F is maintained in its second setting state by maintaining the connection of the outer connecting part C2. The switching part 3F is provided on the bumper beam 300 and includes a drive part 35 and a connecting member 36. The drive part 35 is an electric actuator driven by a solenoid. The connecting member 36 connects the second impact-absorbing member 2F and the bumper beam 300 by engaging with the second impact-absorbing member 2F. The drive part 35 is driven according to the control of the control part 4, causing the connecting member 36 to move, thereby... Figure 29 The engagement and disengagement states of the connecting member 36 and the second impact absorbing member 2F are shown as follows. Figure 30 The connection between the connecting member 36 and the second impact-absorbing member 2F is switched as shown. By changing the connecting member 36 from the engaged state to the unengaged state, the connection of the outer connecting portion C2 is released, and the setting state of the second impact-absorbing member 2F changes from the second setting state to the first setting state. Conversely, by changing the connecting member 36 from the unengaged state to the engaged state, the connection of the outer connecting portion C2 is formed, and the setting state of the second impact-absorbing member 2F changes from the first setting state to the second setting state.

[0134] In the impact absorption device 100F of Embodiment 3, the control unit 4 predicts the impact load on the vehicle and controls the drive unit 35 of the switching unit 3F based on the prediction result, thereby causing the switching unit 3F to switch the setting state of the second impact absorption member 2F. During normal driving, the switching unit 3F maintains the setting state of the second impact absorption member 2F in the second setting state; upon sensing a collision, it maintains the second setting state if a severe collision is predicted, and switches to the first setting state if a minor collision is predicted. However, this disclosure is not limited to this. The switching unit 3F may also be configured to maintain the setting state of the second impact absorption member 2F in the first setting state during normal driving, sense a collision, and switch to the second setting state if a severe collision is predicted.

[0135] The following describes the absorption of collision energy during a vehicle collision achieved by the impact absorption device 100F under impact conditions. Figure 31 This is a top view showing the state of the impact absorbing device 100F when the second impact absorbing member 2F is in the first setting state under impact conditions in Embodiment 3. Figure 32 This is a top view showing the state of the impact absorbing device 100F when the second impact absorbing member 2F is in the second setting state under impact conditions in Embodiment 3. It should be noted that the behavior of the first impact absorbing member 1 under impact conditions is the same as in Embodiment 1, so detailed description is omitted.

[0136] First, such as Figure 31 As shown, when the second impact-absorbing member 2F is in the first setting state, by disengaging the outer connecting part C2, the second impact-absorbing member 2F is connected only in the frame-side connecting part C1. Therefore, the second impact-absorbing member 2F, subjected to an impact load in the load direction, changes its posture by slightly bending while simultaneously tilting towards the side frame 200 with the outer connecting part C2 as a fulcrum. Thus, the second impact-absorbing member 2F avoids the impact load and prevents buckling deformation. As a result, as... Figure 31 As shown, in the case of a light collision with relatively small collision energy, the impact absorption device 100F absorbs the collision energy by deforming only the first impact absorption member 1 in the first impact absorption member 1 and the second impact absorption member 2F, thereby suppressing the deformation of the side frame 200.

[0137] Next, as Figure 32 As shown, when the second impact-absorbing member 2F is in the second setting state, by maintaining the connection of the outer connecting part C2, the second impact-absorbing member 2F is connected between the frame-side connecting part C1 and the outer connecting part C2. Therefore, the posture change of the second impact-absorbing member 2F is restricted, and thus the second impact-absorbing member 2F does not avoid the impact load but bears the impact load. Therefore, as... Figure 32As shown, the second impact-absorbing member 2F is deformed by being squeezed between the side frame 200 and the bumper beam 300. As a result, in the event of a heavy impact with high energy, the impact-absorbing device 100F absorbs the impact energy by deforming at least both the first impact-absorbing member 1 and the second impact-absorbing member 2F. However, if even this is insufficient to absorb the impact energy, the side frame 200 is also deformed to absorb the impact energy.

[0138] As described above, in the impact absorption device 100F of this embodiment, the outer connecting portion C2 can be disconnected via the switching portion 3F. When the second impact absorption member 2F is in the first setting state under impact conditions, the connection of the outer connecting portion C2 is disconnected via the switching portion 3F, thereby allowing the second impact absorption member 2F to avoid impact load. On the other hand, when the second impact absorption member 2F is in the second setting state under impact conditions, the connection between the frame-side connecting portion C1 and the outer connecting portion C2 is maintained, thereby allowing the second impact absorption member 2F to bear the impact load.

[0139] The impact-absorbing device 100F of Embodiment 3 can switch the impact load resistance of the impact-absorbing device 100F by switching the setting state of the second impact-absorbing member 2F. As a result, according to Embodiment 1, the impact-absorbing device 100F of Embodiment 3 can reliably ensure that the occupant is protected from impact caused by a collision, and suppress the deformation of the side frame 200 in the case of a minor collision, thereby improving the maintainability of the vehicle.

[0140] It should be noted that in the above example, the connection state of the outer connecting part C2 in the frame-side connecting part C1 and the outer connecting part C2 is set to be switchable, but this disclosure is not limited to this. The connection state of the frame-side connecting part and the frame-side connecting part in the outer connecting part can also be switchable. Furthermore, by predicting the degree of collision and selecting the operating drive part from multiple drive parts 35, the degree of impact absorption in a heavy collision can be adjusted in multiple stages.

[0141] <Other>

[0142] The embodiments of the impact absorption device disclosed herein have been described above, but the various solutions disclosed in this specification can also be combined with any other features disclosed in this specification.

[0143] Explanation of reference numerals in the attached figures

[0144] 1: First impact absorbing component

[0145] 2: Second impact absorbing component

[0146] 3: Switching Unit

[0147] 4: Control Department

[0148] 5: Base section

[0149] 6: Receiving Department

[0150] 7: Hole Formation (An example of an abutment part)

[0151] 8: Piston (an example of an abutment part)

[0152] 100: Impact Absorption Device

[0153] 200: Side frame (an example of a frame)

[0154] 300: Bumper beam (an example of an outer structure)

Claims

1. An impact absorption device, wherein, have: A first impact-absorbing member is disposed between a frame forming the skeleton of a vehicle and an outer structure located outside the frame in the vehicle. The first impact-absorbing member is configured to deform preferentially over the frame in an impact condition in which the outer structure is displaced or deformed toward the frame due to an impact load on the outer structure. A second impact-absorbing member is disposed between the frame and the outer structure; The switching unit can switch the installation state of the second impact absorbing member between the following states: a first installation state in which the second impact absorbing member avoids the impact load under the impact condition, and a second installation state in which the second impact absorbing member bears the impact load and deforms together with the first impact absorbing member under the impact condition. The base portion is disposed on the frame in a manner that secures the first impact-absorbing member; The receiving portion is formed by opening in the base portion. The receiving portion receives the second impact absorbing member in the first setting state under the impact condition, and allows the second impact absorbing member to move toward the frame side, thereby allowing the second impact absorbing member to avoid the impact load. as well as An abutment portion, disposed on the base portion, abuts against the second impact-absorbing member in the second configuration state under the impact condition, restricting the movement of the second impact-absorbing member towards the frame side, thereby allowing the second impact-absorbing member to bear the impact load. The abutting portion is formed as part of the base portion in such a way that it surrounds the receiving portion. The switching unit switches between the first setting state and the second setting state by displacing the second impact absorbing member relative to the receiving unit.

2. An impact absorption device, wherein, have: A first impact-absorbing member is disposed between a frame forming the skeleton of a vehicle and an outer structure located outside the frame in the vehicle. The first impact-absorbing member is configured to deform preferentially over the frame in an impact condition in which the outer structure is displaced or deformed toward the frame due to an impact load on the outer structure. A second impact-absorbing member is disposed between the frame and the outer structure; The switching unit can switch the installation state of the second impact absorbing member between the following states: a first installation state in which the second impact absorbing member avoids the impact load under the impact condition, and a second installation state in which the second impact absorbing member bears the impact load and deforms together with the first impact absorbing member under the impact condition. The base portion is disposed on the frame in a manner that secures the first impact-absorbing member; The receiving portion is formed by opening in the base portion. The receiving portion receives the second impact absorbing member in the first setting state under the impact condition, and allows the second impact absorbing member to move toward the frame side, thereby allowing the second impact absorbing member to avoid the impact load. as well as An abutment portion, disposed on the base portion, abuts against the second impact-absorbing member in the second configuration state under the impact condition, restricting the movement of the second impact-absorbing member towards the frame side, thereby allowing the second impact-absorbing member to bear the impact load. A vulnerable portion is formed in the base portion, which abuts against the second impact-absorbing member in the first setting state under the impact condition, and breaks under the load of the second impact-absorbing member, thereby opening the receiving portion.

3. The impact absorption device according to claim 1 or 2, wherein, The cross-section of the second impact-absorbing member, that is, the shape of the cross-section orthogonal to the direction from the outer structure side toward the frame side, is smaller than the size of the cross-section of the receiving part at the end of the frame side, and gradually increases towards the outer structure side, becoming larger than the size of the cross-section of the receiving part at the end of the outer structure side.

4. The impact absorption device according to claim 2, wherein, The end portion of the second impact-absorbing member opposite the base portion includes: an abutting region that abuts against the vulnerable portion when the second impact-absorbing member is at least in the first setting state under the impact condition; and a non-abutting region that does not abut against the base portion.

5. The impact absorption device according to claim 1 or 2, wherein, Both the first impact-absorbing member and the second impact-absorbing member are formed as cylindrical shapes extending from the frame side to the outer structure side. A second impact absorbing member is provided inside the first impact absorbing member.

6. The impact absorption device according to claim 5, wherein, A protrusion protruding toward the first impact-absorbing member is formed on the outer peripheral surface of the second impact-absorbing member. The protrusion engages with the inner circumferential surface of the first impact-absorbing member, thereby holding the second impact-absorbing member within the first impact-absorbing member.

7. The impact absorption device according to claim 6, wherein, When the second impact-absorbing member is in the second setting state under the impact condition, the protrusion guides the first impact-absorbing member in a manner that causes the first impact-absorbing member to bend along the second impact-absorbing member.

8. The impact absorption device according to claim 1 or 2, wherein, When the second impact-absorbing member is in the second setting state under the impact condition, the first impact-absorbing member and the second impact-absorbing member are set in a manner in which the timing of the start of deformation of the first impact-absorbing member is different from the timing of the start of deformation of the second impact-absorbing member.

9. The impact absorption device according to claim 8, wherein, The end of the first impact absorbing member on the outer structure side is closer to the outer structure side than the end of the second impact absorbing member on the outer structure side.

10. An impact absorption device, wherein, have: A first impact-absorbing member is disposed between a frame forming the skeleton of a vehicle and an outer structure located outside the frame in the vehicle. The first impact-absorbing member is configured to deform preferentially over the frame in an impact condition in which the outer structure is displaced or deformed toward the frame due to an impact load on the outer structure. A second impact-absorbing member is disposed between the frame and the outer structure; The switching unit can switch the installation state of the second impact absorbing member between the following states: a first installation state in which the second impact absorbing member avoids the impact load under the impact condition, and a second installation state in which the second impact absorbing member bears the impact load and deforms together with the first impact absorbing member under the impact condition. The second impact-absorbing member extends such that one end is connected to the frame and the other end is connected to the outer structure. The frame-side connection portion, which serves as the connection between the second impact-absorbing member and the frame, and the outer-side connection portion, which serves as the connection between the second impact-absorbing member and the outer structure, can be disconnected via the switching portion. When the second impact-absorbing member is in the first setting state under the impact condition, the connection between one of the frame-side connecting part and the outer connecting part is released by the switching part, thereby allowing the second impact-absorbing member to avoid the impact load. When the second impact-absorbing member is in the second setting state under the impact condition, the connection between the frame side connection and the outer side connection is maintained, thereby allowing the second impact-absorbing member to bear the impact load.

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