JP4802485B2 - Shock absorbing member connection structure - Google Patents

Description

  The present invention relates to a shock absorbing member coupling structure that couples a pressure receiving member that receives an impact and an impact absorbing member for reducing the impact from the pressure receiving member, and more particularly, to a support portion for a vehicle body member of a vehicle bumper. The present invention relates to a shock absorbing member coupling structure suitable for the above.

In a conventional automobile, a cylindrical shock absorbing member that extends toward the front of the vehicle is provided on a vehicle body member such as a front side member, and is disposed across the tip of the shock absorbing member via the shock absorbing member. Banpabi supporting the arm on the vehicle body member.

In order to connect the bumper beam and the tip of the cylindrical shock absorbing member, generally, the bumper beam is provided with a pair of mounting brackets extending from the bumper beam to both sides of the tip of the shock absorbing member. The impact absorbing member and the bumper beam are coupled to each other by fastening the impact absorbing member with a fastener having a bolt that penetrates the impact absorbing member in the plate thickness direction and a nut that is screwed to the bolt.

When a compressive force in the axial direction acts on the shock absorbing member from the bumper beam due to the collision of the automobile, the shock absorbing member is broken by this compressive force, and the collision energy is absorbed by this compressive breakage. .

There exists a thing made from FRP (fiber reinforced plastic) excellent in energy absorption efficiency in this kind of impact-absorbing member (for example, refer patent document 1). In order for this FRP shock absorbing member to exhibit its compressive fracture characteristics in the axial direction, which is an advantage of energy absorption efficiency, it is sequentially sequentially in one direction from the tip end to the base end as the mounting end to the bumper beam . It is necessary to realize a crushing axial crushing mode.
JP 2000-240706 A (page 4-5, FIG. 2)

However, as described above, in the conventional structure for connecting the shock absorbing member, the bolt insertion holes for connecting the pair of brackets extending from the bumper beam to the shock absorbing member are provided in the wall thickness direction of the shock absorbing member. It is necessary to form through. The cross section of the shock absorbing member through which the bolt insertion hole passes is discontinuous due to this bolt insertion hole, and the vicinity of the bolt insertion hole, which is a discontinuous portion, becomes a fragile portion, and the shock absorbing member is destroyed from this fragile portion. May be triggered. For this reason, there is a possibility that the destruction of the impact absorbing member in the stable axial crushing mode may be prevented.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shock absorbing member coupling structure capable of reliably coupling a bumper beam and a shock absorbing member without hindering a stable axial crushing mode of the shock absorbing member.

In order to solve the above-described problems, a shock absorbing member coupling structure according to the present invention includes a cylindrical shock absorbing member and a bumper beam disposed on one end of the shock absorbing member. And a fastener having a male screw member extending toward the other end side of the shock absorbing member, and a bumper beam provided on the male screw member and frictionally engaged with the outer peripheral surface of the shock absorbing member by tightening the fastener. An annular member that is disposed around the outer peripheral surface at a distance from the outer peripheral surface of the one end of the shock absorbing member and is supported by the bumper beam; and an annular member. A plurality of members that are spaced apart from each other in the circumferential direction and deformed radially outward by fastening a fastener and frictionally engaged with the outer peripheral surface of the shock absorbing member And having an outer diameter increment larger unit.

According to the present invention, since the via connectors to frictionally engage the outer peripheral surface of the impact absorbing member by tightening of the fastener and the shock absorbing member and the bumper beam is attached, such as a conventional impact absorbing member Both of them can be joined without forming a bolt insertion hole, and since the fragile portion due to the bolt insertion hole is not formed in the shock absorbing member, unstable breakage from this fragile portion can be prevented, A stable axial crushing mode can be obtained in the absorbing member.

  The features of the present invention will be described in detail below with reference to the illustrated embodiments.

  FIG. 1 shows an example in which the shock absorbing member coupling structure according to the present invention is applied to a bumper mounting portion of a vehicle.

  In a vehicle 11 such as an automobile to which the coupling structure 10 according to the present invention is applied, bumper beams 12 are arranged along the width direction of the vehicle 11 at the front portion of the vehicle, and the bumper beams are arranged on both side portions (in FIG. The one side is shown) is coupled to the front end of the cylindrical shock absorbing member 13.

  Each impact absorbing member 13 is supported by a front end of a front side member which is one of well-known vehicle body members (not shown), and through the impact absorbing member 13 supported by the front end of the front side member. The bumper beam 12 is supported by the vehicle body member.

  The shock absorbing member 13 is composed of a truncated cone-shaped tubular body as a whole, and, as shown in FIG. 2, from the base end supported by the front side member toward the front end coupled to the bumper beam 12, This is a conventionally well-known FRP shock absorbing member that gradually decreases the outer diameter and gradually decreases the diameter of the inner hole 13a.

  A front end of the shock absorbing member 13 is provided with a taper 14 for preventing the shock absorbing member 13 from buckling when receiving a pressing force from the bumper beam 12. The bumper beam 12 is disposed in contact with the front end of the shock absorbing member 13, and includes a male screw member 15, a fastener 17 having a nut 16 that is a female screw member screwed to the male screw member, and a joint 18. The bumper beam 12 and the shock absorbing member 13 are coupled.

  As shown in FIG. 2, the connector 18 includes an expansion member 19 and a pushing member 20 that can be inserted into the inner hole 13a of the shock absorbing member 13, and both members 19 and 20 are made of, for example, a synthetic resin material. Yes.

  The expansion member 19 can be fitted into the inner hole 13a of the shock absorbing member at the front end of the shock absorbing member 13 and can contact the bumper beam 12, and the inner peripheral surface 13b of the shock absorbing member 13 from the bottom. And an inclined peripheral wall 19b that rises along. A hole 19 c that allows the male screw member 15 to pass therethrough is formed in the bottom 19 a of the expansion member 19. The expansion member 19 is formed with a space 19d that gradually increases in diameter toward the opening located on the opposite side of the bottom portion 19a by the inclined peripheral wall 19b. In the inclined peripheral wall 19b of the expansion member 19, a slit 19e that allows deformation of the inclined peripheral wall in the radially outward direction opens to the opening edge of the space 19d as shown in FIG.

  The pushing member 20 has a truncated cone shape, the outer diameter of the small diameter end 20a is smaller than the opening diameter of the space 19d of the expansion member 19, and the outer diameter of the large diameter end 20b is the space 19d of the expansion member 19. It is larger than the opening diameter. Therefore, as shown in FIG. 3 and FIG. 4, the inclined peripheral wall 19b of the expansion member 19 is attached with the symbol α in FIG. 4 by pushing the pushing member 20 into the space 19d of the expansion member 19 from the small diameter end 20a side. As shown by the arrows, the joint member 18 including the expansion member 19 and the push-in member 20 can be expanded radially outward from the insertion end side of the push-in member 20 due to the bending deformation of the inclined peripheral wall 19b due to the push-in. Increase the substantial outer diameter.

  For the pushing operation of the pushing member 20, one end of the male screw member 15 is fixed to the pushing member 20 as shown in FIG. The male screw member 15 passes through the bolt hole 12a of the bumper beam 12 from the pushing member 20 through the hole 19c of the expansion member 19, and protrudes from the front surface of the bumper beam. At the protruding end of the male screw member 15, an annular flexible member 21, a washer 22 and the nut 16 having a predetermined compressive strength are sequentially arranged toward the tip.

  When the nut 16 is screwed into the male screw member 15 by an operation from the front of the bumper beam 12, and the nut 16 is tightened by a rotation operation of the nut 16, the pushing member 20 of the connector 18 fixed to the male screw member 15 is expanded. As described with reference to FIG. 4, the inclined peripheral wall 19 b of the expansion member 19 is expanded outward in the radial direction, and the expanded inclined peripheral wall 19 b of the shock absorbing member 13 is Frictionally engages with the inner peripheral surface 13b.

  Due to this frictional engagement, when the connector 18 as the outer diameter increasing means is fixed to the front end portion of the shock absorbing member 13, the connecting device fixed to the front end portion of the shock absorbing member 13 by the subsequent rotation operation of the nut 16. The bumper beam 12, the flexible structural member 21 and the washer 22 are tightened between the nut 18 and the nut 16, and the bumper beam 12 and the shock absorbing member 13 are coupled by tightening the fastener 17. In this coupled state, since the expansion member 19 of the connector 18 presses the inner peripheral surface 13b of the shock absorbing member 13, the distal end portion of the shock absorbing member 13 is reinforced by the connector 18 from the inside thereof, and the shock absorbing member 13 absorbs the shock. The coupled state between the member 13 and the bumper beam 12 is reliably maintained.

  The flexible structure member 21 is not substantially subjected to compressive deformation depending on the tightening force of the fastener 17 including the nut 16 and the male screw member 15, and the taper 14 portion of the impact absorbing member 13 which will be described later is subjected to compression failure. The strength is set such that compression deformation occurs with an external force smaller than the external force. Such a flexible structure member 21 can be formed of, for example, a synthetic resin material or a rubber material having an appropriate hardness.

  In the coupling structure 10 according to the present invention, as described above, the outside of the joint 18 that is an outer diameter increasing means provided on the male screw member 15 that is screwed into the nut 16 by rotating the nut 16 from the front surface of the bumper beam 12. The diameter can be increased, so that the joint 18 is frictionally engaged with the inner peripheral surface 13 b of the shock absorbing member 13, and the fastener 17 is moved by the frictional engagement between the joint 18 and the shock absorbing member 13. The bumper beam 12 and the shock absorbing member 13 are firmly coupled to each other. Therefore, the bumper beam 12 and the shock absorbing member 13 can be firmly coupled without forming a hole that generates a weak portion as in the conventional case on the wall surface of the shock absorbing member 13.

  As shown in FIG. 5, for example, when a pressing force F in the axial direction acts on the male screw member 15 protruding from the front surface of the bumper beam 12 due to a collision of the vehicle 11, the pressing force F is applied between the washer 22 and the bumper beam 12. It acts as a compressive force on the flexible structural member 21 disposed therebetween. Therefore, when the pressing force F exceeding the predetermined value acts on the male screw member 15, the flexible structure member 21 is subjected to compressive deformation as shown in FIG. As the flexible structural member 21 is compressed and deformed, the male screw member 15 and the pushing member 20 fixed to the male screw member are displaced to the right in the figure, and the pushing member 20 moves from the pushing position in the space 19d of the expansion member 19. Retreat toward the opening in the void. By the retreat of the pushing member 20, the pressing force toward the impact absorbing member 13 acting on the expansion member 19 of the connector 18 is released, so that the expansion member 19 and the inner peripheral surface 13 b of the impact absorbing member 13 are released. The frictional engagement is released, and thereby the expansion member 19 of the connector 18 is released from the connection with the shock absorbing member 13. Therefore, the flexible structure member 21 functions as a connection release means for the connector 18.

By releasing the connection of the connector 18, the reinforcing function of the connector 18 with respect to the shock absorbing member 13 is released. Therefore, when a strong impact force acts on the bumper beam 12 from the front of the vehicle 11 following the pressing force F applied to the male screw member 15, the impact force is not partially received by the expansion member 19, but almost All acts as a compressive force of the shock absorbing member 13. At this time, as described above, the reinforcing function of the shock absorbing member 13 by the connector 18 is released, and the shock absorbing member 13 is provided with a hole like a conventional bolt insertion hole penetrating the wall surface. since it is not, depending on the impact force from bar Npabimu 12, shock absorbing member 13 is sequentially destroyed in a stable axial collapse mode toward the proximal portion from the tip that abuts on the bumper beam 12, thereby reliably and favorably The impact force from the bumper beam 12 is alleviated.

  By releasing the connection of the connector 18, the reinforcing function of the connector 18 with respect to the shock absorbing member 13 is released. Since it hold | maintains along the surface 13b, the inner peripheral surface 13b of the front-end | tip part of the impact-absorbing member 13 which is going to be destroyed is restrained. Since the breaking mode of the shock absorbing member 13 can be suitably controlled by the restraining action of the inclined peripheral wall 19b, the reaction force can be improved without increasing the cross-sectional area of the shock absorbing member 13, thereby A better crushing mode can be obtained. This is also clear from the following points.

  That is, FIG. 6 shows a paper that reports the control effect of the crushing mode when the cylindrical member receives a compressive force from its tip ("Study on energy absorbing parts using composite cylinders"). Part of the Pre-Lecture Preprint, 1993).

  FIG. 6A shows a state in which the compression force F is applied from the pressure receiving plate B to the end surface of the cylindrical body A in a state where neither the inner peripheral surface nor the outer peripheral surface of the end portion of the cylindrical body A is constrained. The collapse state of the edge part of the cylindrical body A is shown. FIGS. 6B and 6C show a collapsed state of the cylindrical body A in a state where the inner peripheral surface and the outer peripheral surface of the end portion of the cylindrical body A are constrained by the restraining members C and D, respectively.

  As shown in FIG. 6 (a), when neither the inner peripheral surface nor the outer peripheral surface of the end portion of the cylindrical body A is constrained, a wedge E is formed, whereby the cross section of the cylindrical body A is inward in the radial direction. It is reported that the reaction force of the cylindrical body A is reduced due to tearing outward. On the other hand, as shown in FIG. 6B and FIG. 6C, by restricting either the inner peripheral surface or the outer peripheral surface of the end portion of the cylindrical body A with the restraining members C and D, As shown in FIG. 6 (a), it is possible to prevent the tearing phenomenon caused by the wedge E, and as a result, the energy absorption efficiency of the cross section at the end of the cylindrical body A is reported to be improved. .

  7 and 8 show modifications of the connector 18 disposed inside the shock absorbing member 13, respectively. The connector 18 shown in FIG. 7 is made of, for example, a synthetic resin material, and includes cylindrical first and second sliding members 23 and 24 having the same outer diameter. The sliding members 23, 24 can be obtained by cutting a cylindrical body having the same diameter in the longitudinal axis direction along a slope that forms an angle with the longitudinal axis, and can form inclined surfaces 23a, 24a that can contact each other. Have. When the shock absorbing member 13 is formed of a truncated cone-shaped cylindrical body, the sliding members 23 and 24 are, for example, a cylindrical base along the inner hole 13a of the shock absorbing member 13 along a slope that makes an angle with the longitudinal axis. It is desirable to use the sliding members 23 and 24 obtained by cutting.

  The first sliding member 23 is formed with a hole 23b for receiving the male screw member 15 with play. An end surface 23c located on the opposite side of the inclined surface 23a is not shown, but is the same as the expansion member 19 shown in FIG. Further, the bumper beam 12 is arranged in contact with the back surface of the bumper beam 12 inside the tip of the shock absorbing member 13. The second sliding member 24 is disposed inside the shock absorbing member 13 with its inclined surface 24a facing the inclined surface 23a of the first sliding member 23, and penetrates the hole 23b of the first sliding member 23. The male screw member 15 is fixed.

  Accordingly, as in the example shown in FIG. 2, by tightening the nut 16 screwed into the protruding end of the male screw member 15 protruding from the front surface of the bumper beam 12, the first and The second sliding members 23, 24 can be slid in opposite directions relative to each other along the radial direction perpendicular to the axial direction of the male screw member 15, and each of the second sliding members 23, 24 slightly moves on the inner peripheral surface 13 b of the shock absorbing member 13. Because of the displacement, the joint 18 composed of the first and second sliding members 23, 24 substantially increases its outer diameter. By increasing the outer diameter of the connector 18, the sliding members 23 and 24 of the connector 18 are pressed against the inner peripheral surface 13 b of the shock absorbing member 13. Due to this pressing force, the sliding members 23 and 24 are frictionally engaged with the inner peripheral surface 13b of the shock absorbing member 13, whereby the connector 18 is fixed to the distal end portion of the shock absorbing member 13. As in the example, the shock absorbing member 13 and the bumper beam 12 are coupled. Further, the joint of the joint member 18 composed of the sliding members 23 and 24 to the shock absorbing member 13 can be released by compressive deformation of the flexible structure member 21 incorporated in the male screw member 15 as described above.

  The connector 18 shown in FIG. 8 includes a cylindrical elastic body 27 disposed between a pair of seat plates 25 and 26. A hole 25a for slidably receiving the male screw member 15 is formed in one seat plate 25 that contacts the back surface of the bumper beam 12 shown in FIG. 2, and the other seat plate 26 spaced from the seat plate 25 is a male screw member. 15 is fixed to the end. The elastic body 27 is disposed so that the end faces thereof are brought into contact with the both seat plates 25 and 26 so as to receive the male screw member 15 in the central hole 27a.

  Accordingly, as in the example described with reference to FIG. 7, by tightening the nut 16 (see FIG. 2), the elastic body 27 is compressed and deformed in the axial direction between both seat plates 25 and 26, and FIG. As indicated by the symbol α, the elastic body 27 can be expanded outward in the radial direction, and the elastic body 27 is frictionally engaged with the inner peripheral surface 13 b of the shock absorbing member 13 by the increase of the outer diameter due to the expansion of the elastic body 27. Can be made. By this frictional engagement, the connector 18 is fixed to the tip of the shock absorbing member 13, and the shock absorbing member 13 and the bumper beam 12 are coupled to each other as in the above example. Further, since the bulging deformation of the elastic body 27 can be released by the compression deformation of the flexible structural member 21 similar to that described above incorporated in the male screw member 15, the shock absorbing member of the connector 18 made of the elastic body 27 can be released. The connection to 13 can be released. As the elastic body 27, it is desirable to use a cylindrical trapezoidal shape along the inner hole 13 a of the shock absorbing member 13 when the shock absorbing member 13 is formed of a truncated cone-shaped cylindrical body.

9, in connection with the externally threaded member 15 of the fastener 17, an example of the flexible structural members are arranged and configured in disc spring 121 made of a plate-shaped spring member between the Banpabi arm 1 2 and washer 22. The disc spring 121 causes buckling deformation when a pressing force exceeding a predetermined value acts on the male screw member 15 as in the flexible structure member 21 made of a rubber material or a synthetic resin material. As described above, the coupling of the connector 18 to the shock absorbing member 13 is released by the displacement of the male screw member 15 in the axial direction.

  FIGS. 10 to 12 show an example in which a cylindrical shock absorbing member 113 having a uniform diameter in the axial direction is used as the shock absorbing member. A connector 18 similar to that described above is disposed.

In the example shown in FIG. 10, the flexible structural member 21 is fitted to the male screw member 15 between the washer 22 and the bumper beam 12 as shown in FIG. 2, but as shown in FIG. The structural member 21 can be fitted to the male screw member 15 between the bumper beam 12 and the connector 18. As described above, regardless of the shape of the shock absorbing members 13 and 113, the flexible structural member 21 or 121 can be disposed in contact with either the front surface or the back surface of the bumper beam 12.

Further, instead of using the flexible structural member 21 or 121 which is a separate member from the bumper beam 12, the bumper beam 112 itself coupled to the shock absorbing member 113 is connected to the shock absorbing member 113 of the joint 18 as shown in FIG. A function of releasing the frictional engagement can be provided. The bumper beam 112 employs a flexible structure that causes compression deformation that can release the frictional engagement of the joint 18 with the shock absorbing member 113 when a pressing force exceeding a predetermined value is applied thereto. In this case, the least regions corresponding to the washer 22 of the bumper beam 112 can be employed in the form of such a flexible structure.

  As shown in FIG. 13 or FIG. 14, the fastener 17 is replaced with the joint 18 composed of the above-described outer diameter increasing means that frictionally engages the inner peripheral surface 13 b of the shock absorbing member 13, 113 by tightening the fastener 17. It is possible to use a connector 118 that is deformed inward in the radial direction by tightening and is frictionally engaged with the outer peripheral surface 13c of the shock absorbing members 13 and 113.

The joint 118 shown in FIG. 13 includes an annular member 28 disposed around the outer peripheral surface 13c at one end where the taper 14 of the shock absorbing member 13 is formed, and an annular wedge member 29. Is provided. One end of the annular member 28 is fixed to the back surface of the bumper beam 12, and defines a recess 28 a whose diameter gradually increases to receive the one end of the shock absorbing member 13. A connecting member 30 is provided between the bumper beam 12 and one end of the shock absorbing member 13 and is fixed to the male screw member 15 in the recess 28a. The wedge member 29 of the annular member 28 is coupled to the coupling member 30 at its distal end so that the distal end can be interrupted between the annular member 28 and the shock absorbing member 13. Accordingly, by tightening the nut 16 of the fastener 17, the wedge member 29 can be inserted between the inner peripheral surface 28 b of the annular member 28 and the outer peripheral surface 13 c of the shock absorbing member 13. Thus, the wedge member 29 is frictionally engaged with the outer peripheral surface 13c of the shock absorbing member 13, and the shock absorbing member 13 and the bumper beam 12 are coupled by this frictional engagement. This coupling can be released by compressive deformation of the flexible structure member 21 as in the above example.

The joint 118 shown in FIG. 14 is arranged around the outer peripheral surface 13 c at a distance from the outer peripheral surface 13 c at one end of the shock absorbing member 113, and the annular member 28 fixed to the bumper beam 12. A plurality of outer members that are spaced apart from each other in the circumferential direction with the member 113 and that are deformed radially outward by the fastening of the respective fasteners 17 and frictionally engage with the outer peripheral surface 13c of the shock absorbing member 113. Diameter increasing means 18. In the illustrated example, the inner peripheral surface 28 b of the annular member 28 has a uniform aperture in the axial direction as in the shock absorbing member 113.

  4, 7, and 8 can be used as the outer diameter increasing means. In the joint 18 shown in FIG. 4, each expansion member 19 is tightened by tightening each fastener 17. One side of the inclined peripheral wall 19 b is frictionally engaged with the inner peripheral surface 28 b of the annular member 28, and the other side is frictionally engaged with the outer peripheral surface 13 c of the shock absorbing member 113. In the connector 18 shown in FIG. 7, when each fastener 17 is tightened, one of the sliding members 23 and 24 of each connector 18 is frictionally engaged with the outer peripheral surface 13 c of the shock absorbing member 113 and the other is annular. The member 28 is frictionally engaged with the inner peripheral surface 28 b of the member 28. Further, in the connector 18 shown in FIG. 8, by tightening each fastener 17, one side of the peripheral surface of each elastic body 27 is frictionally engaged with the inner peripheral surface 28 b of the annular member 28, and the other side is the shock absorbing member 113. The outer peripheral surface 13c is frictionally engaged.

According to the coupling structure 10 according to the present invention, the shock absorbing member 13 is connected via the joint members 18 and 118 that are frictionally engaged with the inner peripheral surface 13b or the outer peripheral surface 13c of the shock absorbing members 13 and 113 when the fastener 17 is tightened. 113 and the bumper beam 12 are coupled to each other, so that the bolts 12 can be coupled to the shock absorbing members 13 and 113 without forming bolt insertion holes as in the prior art. Since the portion is not formed, it is possible to prevent unstable breakage from the fragile portion, and it is possible to prevent the occurrence of the remaining crush in the vicinity of the bolt insertion hole. A stable axial crushing mode can be obtained.

  Further, since the bolt insertion holes for coupling to the shock absorbing members 13 and 113 can be made unnecessary, the reaction force against the compression force can be increased as compared with the conventional one having the same cross-sectional shape. As a result, the axial crushing mode characteristics can be improved.

Further, in the above-described shock absorbing member coupling structure 10 of the present invention, it is not necessary to extend the pair of mounting brackets to the bumper beam 12, and therefore, the layout is not restricted by the conventional pair of mounting brackets. , Layout flexibility is improved.

Furthermore, the shock absorbing members 13 and 113 and the bumper beam 12 can be coupled with a coupling rigidity of a level generally required in a vehicle, and the coupling structure can be simplified. Further, since assembly and disassembly can be performed by work from the front of the bumper beam 12, maintainability and productivity are improved.

  In the above description, the shock absorbing member coupling structure according to the present invention has been described along the example applied to the bumper mounting portion of the vehicle. However, the present invention is not limited to this, and the present invention is applied to the coupling of various shock absorbing members. Can do.

It is a perspective view which shows the coupling structure of the impact-absorbing member which concerns on this invention. It is sectional drawing obtained along line II-II shown in FIG. It is a perspective view which decomposes | disassembles and shows the connector which consists of an outer diameter increase means shown in FIG. It is sectional drawing explaining the diameter increase principle of the connector shown in FIG. It is drawing similar to FIG. 2 which shows the state by which engagement by the connector shown in FIG. 2 was cancelled | released. 6 is a cross-sectional view showing a crushing mode due to compression of the shock absorbing member, and FIG. 6A shows a crushing mode in which the inner peripheral surface and the outer peripheral surface of the end of the shock absorbing member are in an unconstrained state. FIG. 6B shows a crushing mode when the inner peripheral surface of the end portion is in a restrained state, and FIG. 6C shows a crushing mode when the outer peripheral surface of the end portion is in a constrained state. FIG. 5 is a view similar to FIG. 4 showing Modification 1 of the outer diameter increasing means shown in FIG. 2. FIG. 5 is a view similar to FIG. 4 showing Modification 2 of the outer diameter increasing means shown in FIG. 2. It is a fragmentary sectional view which shows the modification 1 of the flexible structure shown in FIG. It is drawing similar to FIG. 2 which shows the example 1 of arrangement | positioning of a flexible structure. It is drawing similar to FIG. 2 which shows the example 2 of arrangement | positioning of a flexible structure. It is drawing similar to FIG. 2 which shows the modification 2 of a flexible structure. It is drawing similar to FIG. 2 which shows the other specific example of a joining tool. It is drawing similar to FIG. 2 which shows the other specific example of a joining tool.

DESCRIPTION OF SYMBOLS 10 Connection structure of shock absorbing member 12 Bumper beam 13 Shock absorbing member 13b Inner peripheral surface of shock absorbing member 13c Outer peripheral surface of shock absorbing member 15 Male screw member 17 Fastener 18, 118

Claims (8)

A coupling structure for coupling a cylindrical impact absorbing member and a bumper beam disposed on one end side of the impact absorbing member,
A fastener having a male screw member that passes through the bumper beam and extends toward the other end of the shock absorbing member, and a frictional engagement with the outer peripheral surface of the shock absorbing member by tightening the fastener. A fitting for joining the bumper beam and the shock absorbing member by combining,
The joint is disposed between the annular member and the shock absorbing member, and an annular member disposed around the outer circumferential surface at a distance from the outer circumferential surface of the one end of the shock absorbing member and supported by the bumper beam. A plurality of outer diameter increasing means arranged at intervals in the circumferential direction and deformed radially outward by tightening the fastener and frictionally engaged with the outer peripheral surface of the shock absorbing member. Member connection structure. Each of the outer diameter increasing means is arranged in contact with the two members between the shock absorbing member and the annular member outside the one end of the shock absorbing member, and an expansion member whose outer diameter can be expanded. The shock absorbing member coupling structure according to claim 1, further comprising: a pushing member coupled to the male screw member and capable of entering the expansion member so as to increase an outer diameter of the expansion member by tightening the fastener . Each of the outer diameter increasing means joins inclined surfaces for causing a sliding displacement to the opposite sides along the radial direction of the male screw member by tightening the fastener outside the one end of the shock absorbing member. The first and second sliding members are disposed between the shock absorbing member and the annular member, and one of the first and second sliding members is the shock absorbing member due to the sliding displacement. The shock absorbing member coupling structure according to claim 1, wherein the other is frictionally engaged with the outer peripheral surface of the ring member and the other is frictionally engaged with the inner peripheral surface of the annular member . The outer diameter increasing means has a columnar elastic body that frictionally engages with the outer peripheral surface of the shock absorbing member by increasing the outer diameter by tightening the fastener outside the one end of the shock absorbing member. The joint structure of the impact-absorbing member according to 1. A flexible structure that releases the frictional engagement of the joint with the shock absorbing member by being compressed and deformed by a pressing force in the axial direction of the male screw member is provided in association with the male screw member. The coupling structure of the shock absorbing member according to any one of claims 1 to 4 . 6. The flexible structure according to claim 5, wherein the flexible structure is disposed in contact with either the front surface or the back surface of the bumper beam through which the male screw member penetrates so as to be compressible and deformable by a compressive force in the axial direction of the male screw member . Joint structure of shock absorbing member. The shock absorbing member coupling structure according to claim 6 , wherein the flexible structure includes a cylindrical elastic member that fits into the male screw member . The shock absorbing member coupling structure according to claim 6 , wherein the flexible structure includes a disc spring fitted to the male screw member .

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