JP5634896B2 - Shock absorbing member for vehicle - Google Patents

Description

  The present invention relates to a vehicle impact absorbing member provided in a front end of an automobile, for example, and a related technology.

  A bumper beam as an impact absorbing member is provided inside the bumper at the front end of the automobile in order to absorb an impact at the time of a collision.

  The bumper beam is provided at a pair of cylindrical crash boxes, a bumper reinforcement provided at a front end portion of the pair of crash boxes, and a rear end portion of the pair of crash boxes, and fixes the crash box to the vehicle structure. It has a bumper stay. At the time of collision, the crash box is compressed and deformed to absorb the collision energy.

  On the other hand, a tow hook is used when towing an automobile or fixing an automobile during transportation, and an automobile in which a nut (female screw member) for attaching the tow hook is attached to the inside of the crash box is well known. It is.

  Since a crash box is usually a cylindrical hollow structure, in order to mount a female screw member for attaching a tow hook inside the crash box, a mounting portion such as a bracket is provided inside the crash box, and a female screw member is provided in the mounting portion. I am trying to install.

  For example, in the bumper beam shown in Patent Document 1, a bumper stay with an attachment portion is attached to the rear end of the crash box by bolting, and a tow hook attachment nut is fixed to the attachment portion of the bumper stay. Further, in this document, a bumper stay with a mounting portion is fixed by electromagnetic forming at the rear end of the crash box, and a nut for mounting a tow hook is fixed to the mounting portion of the bumper stay.

  In the bumper beam shown in Patent Document 2, a plate member is fixed to a rear end of the crash box by bolting, and a nut for attaching a tow hook is fixed to the plate member.

JP 2008-37220 A JP 2009-292175 A

  However, in the above conventional bumper beam, when assembling the bumper stay with the mounting portion to the crash box, it is difficult to align the bumper stay with the crash box, making assembly work difficult, reducing productivity and cost. There was a problem of inviting an increase.

  Needless to say, when installing a mounting portion such as a bracket for mounting a female screw member for attaching a tow hook to a shock absorbing member such as a crash box, the original function of the shock absorbing member, that is, by installing the mounting portion, that is, It is necessary to avoid situations that adversely affect the shock absorption characteristics.

  The present invention has been made in view of the above-described problems, and can improve productivity and reduce costs while maintaining excellent shock absorption characteristics. Further, the mounting plate can be securely installed in the crash box. It is an object of the present invention to provide a vehicle impact absorbing member that can be installed in a vehicle and related technology.

  In order to solve the above problems, the present invention comprises the following means.

[1] A cylindrical crash box,
A stay member provided at the opening edge of the cup-like portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The stay member is fixed to the crash box in a state where the base end side of the crash box is accommodated in the cup-shaped portion and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion. A shock absorbing member for a vehicle.

  [2] The vehicle impact absorbing member according to [1], wherein a female thread for attaching a pulling hook is provided on the bottom wall of the cup-shaped portion.

  [3] Projections protruding in the outer diameter direction are respectively formed at positions corresponding to each other on both the peripheral walls of the crash box and the cup-shaped portion by tube expansion processing using a tube expansion mold, whereby the cup shape 3. The vehicle impact absorbing member according to item 1 or 2, wherein the portion is fastened and fixed to the crash box.

  [4] Protrusions projecting in the inner diameter direction are respectively formed at positions corresponding to each other on the peripheral walls of the crush box and the cup-shaped portion by a tube-reducing process using a tube-reducing mold, whereby the cup 3. The impact absorbing member for a vehicle according to the preceding item 1 or 2, wherein the shape portion is fastened and fixed to the crash box.

[5] A retaining protrusion is provided in a manner of projecting in the inner diameter direction at the opening edge of the cup-shaped portion,
A protrusion projecting in the outer diameter direction is formed at a position corresponding to the cup-shaped part on the peripheral wall of the crash box by a tube expansion process using a tube expansion mold, and the retaining protrusion is locked to the protrusion. 3. The vehicle impact absorbing member according to 1 or 2 above, wherein the cup-shaped portion is fixed to the crash box in a retaining state.

  [6] The impact-absorbing member for vehicles according to any one of items 1 to 5, wherein the cup-shaped portion is fixed to the crash box with an adhesive.

  [7] The impact absorbing member for a vehicle according to any one of the preceding items 1 to 6, wherein a partition wall partitioning the inside of the crash box is formed in the crash box so as to extend along an axial direction.

  [8] The vehicle impact absorbing member according to any one of the preceding items 1 to 7, wherein a flange of the stay member is formed integrally with the cup-shaped portion.

[9] A stay member attached to the cylindrical crash box in the vehicle impact absorbing member,
A cup-shaped part;
A flange that is provided on the opening edge of the cup-shaped portion so as to protrude in the outer diameter direction and that can be fixed to the vehicle structure;
A stay member characterized in that the base end side of the crash box is accommodated in the cup-shaped portion, and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion, and can be fixed to the crash box. .

[10] A cylindrical crash box;
Bumper reinforcement,
A stay member provided at the opening edge of the cup-like portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The bumper reinforcement is attached to the tip side of the crash box,
The stay member is fixed to the crash box in a state where the base end side of the crash box is accommodated in the cup-shaped portion and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion. Bumper beam for vehicles.

[11] A cylindrical crash box;
A stay member provided at the opening edge of the cup-shaped portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
Fixing the stay member to the crush box in a state where the base end side of the crush box is accommodated in the cup-shaped portion and the base end surface of the crush box is in contact with the bottom wall of the cup-shaped portion; A method of manufacturing a shock absorbing member for a vehicle, which is characterized by the above.

[12] A cylindrical crash box;
Bumper reinforcement,
A stay member provided at the opening edge of the cup-shaped portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
Attaching the bumper reinforcement to the tip side of the crash box,
Fixing the stay member to the crush box in a state where the base end side of the crush box is accommodated in the cup-shaped portion and the base end surface of the crush box is in contact with the bottom wall of the cup-shaped portion; A method for manufacturing a bumper beam for a vehicle.

  According to the shock absorbing member for a vehicle of the invention [1], a flange that functions as a bumper stay for fixing the stay member to the crash box simply by assembling the stay member to the crash box, and a bracket for attaching a member such as a traction hook ( It is possible to reliably install the bottom wall that functions as the member mounting portion. Therefore, as compared with the case where the bracket and the bumper stay are assembled separately, the assembling work can be performed easily and smoothly, and the productivity can be improved and the cost can be reduced. Furthermore, the bottom wall of the cup-shaped part is brought into contact with the base end surface of the crash box, so that the stay member can be easily positioned with respect to the crash box, and the assembling can be performed more easily and smoothly. Improvement and cost reduction can be achieved more reliably.

  Further, since the crash box is supported by the vehicle structure via the stay member, the impact energy applied to the bumper reinforcement can be reliably absorbed by the deformation of the crash box, and excellent shock absorption characteristics can be obtained.

  According to the impact absorbing member for a vehicle of the invention [2], the pulling hook can be attached to the bottom wall of the stay member as necessary. The pulling hook attached to the bottom wall of the stay member is applied with a force in the pulling direction and the pushing-in direction by pulling the other vehicle. In the present invention, the pulling force applied to the pulling hook is applied to the end surface of the crash box or the stay It acts on the vehicle structure via the flange of the member. Further, the pressing force for pushing the traction hook does not act on the crash box, but acts on the vehicle structure via the stay member. Therefore, it is possible to prevent a problem that the crash box, the bumper reinforcement, etc. are inadvertently deformed by the force applied to the tow hook.

  According to the vehicle impact absorbing member of the invention [3] to [6], the stay member can be easily and reliably fixed to the crash box.

  According to the vehicle impact absorbing member of the invention [7], the amount of collision energy absorbed can be adjusted more appropriately, and the attack absorbing characteristics can be further improved.

  According to the vehicle impact absorbing member of the invention [8], the stay member can be easily manufactured.

  According to the stay member of the invention [9], in the same manner as described above, while maintaining excellent shock absorption characteristics, it is possible to improve productivity and reduce costs, and furthermore, the bottom wall that functions as a member mounting portion Can be installed.

  According to the vehicle bumper beam of the invention [10], as described above, while maintaining excellent shock absorption characteristics, it is possible to improve productivity and reduce costs, and further function as a member mounting portion. The bottom wall can be installed reliably.

  According to the invention [11], a vehicle impact absorbing member having the same effect as described above can be manufactured.

  According to the invention [12], it is possible to manufacture a vehicular bumper beam having the same effect as described above.

FIG. 1 is a plan view showing a vehicle bumper beam according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view showing the bumper beam of the first embodiment. FIG. 3 is a rear view showing the bumper beam of the first embodiment. FIG. 4 is a side cross-sectional view showing the vicinity of one of the crash boxes in the bumper beam of the first embodiment with the traction hook attached. FIG. 5A is an exploded perspective view showing the vicinity of one side crush box in the first embodiment in a state before tube expansion processing. FIG. 5B is an exploded perspective view showing the vicinity of the other crash box in the first embodiment in a state before tube expansion processing. FIG. 6 is a plan view showing the bumper beam of the first embodiment with a tube expansion die inserted. FIG. 7 is a front view showing the bumper beam of FIG. 8A is a cross-sectional view taken along line AA in FIG. 8B is a cross-sectional view taken along line BB in FIG. FIG. 9 is a perspective view showing a stay member used in a vehicle bumper beam which is a modification of the present invention. FIG. 10 is a cross-sectional view showing the vicinity of the crash box in the bumper beam of the modified example in a state immediately after the mold is inserted, and is a cross-sectional view corresponding to the cross section taken along the line BB of FIG. FIG. 11 is a side sectional view showing the vicinity of one of the crash boxes in the vehicle bumper beam according to the second embodiment of the present invention with the traction hook attached. FIG. 12 is an enlarged cross-sectional view of a portion surrounded by a dashed line in FIG. FIG. 13 is a side sectional view showing the vicinity of one of the crash boxes in the bumper beam for a vehicle according to the third embodiment of the present invention with the traction hook attached. FIG. 14 is a side cross-sectional view showing the vicinity of one crash box in a vehicle bumper beam according to a fourth embodiment of the present invention in a state where a tow hook is attached.

<First Embodiment>
1 is a plan view showing a vehicle bumper beam according to a first embodiment of the present invention, FIG. 2 is a schematic perspective view, FIG. 3 is a rear view, and FIG. 4 is a crash box on one side of the bumper beam according to the first embodiment. FIG. 5A is an exploded perspective view showing the periphery of one crush box in a state before tube expansion processing, and FIG. 5B is an exploded perspective view showing the periphery of the other crash box in a state before tube expansion processing. .

  As shown in these drawings, the bumper beam of the first embodiment constitutes a vehicle impact absorbing member that is provided at the front end of an automobile and absorbs impact energy at the time of collision. The bumper beam includes a bumper reinforcement 1, a pair of left and right crash boxes 2, a stay member 3 provided on one crash box 2 arranged on the right side of FIG. 1, and the other side arranged on the left side of FIG. The bumper stay 4 provided in the crash box 2 is provided.

  In the present embodiment, the bumper reinforcement 1 is constituted by, for example, an extruded product or a drawn product made of aluminum or an alloy thereof.

  The bumper reinforcement 1 in the present embodiment is formed such that the intermediate portion slightly protrudes forward by bending both sides in the vehicle width direction backward.

  The bumper reinforcement 1 includes a peripheral wall 11 formed in a vertically long rectangle in a cross-sectional shape when cut along a plane orthogonal to the length direction, and a front and rear wall at an intermediate position in the height direction of the peripheral wall 11. And a partition wall 12 integrally formed so as to be bridged therebetween. In other words, the bumper reinforcement 1 is formed in a so-called “day” cross-sectional shape. The partition wall 12 is formed continuously in the length direction (vehicle width direction) of the bumper reinforcement 1 except for a portion where a mounting hole 51 described later is formed.

  At both end portions in the length direction of the bumper reinforcement 1, attachment holes 15, 15 penetrating in the front-rear direction are formed in the front wall and the rear wall of the peripheral wall 11.

  The inner peripheral shape of the mounting hole 15 is formed corresponding to the outer peripheral shape of the tip portion of the crash box 2, and the tip portion of the crash box 2 can be loosely inserted into the mounting hole 15.

  Similarly to the above, the crash box 2 is constituted by an extruded product, a drawn product, or the like made of aluminum or an alloy thereof.

  The crush box 2 includes a hollow cylindrical peripheral wall 21 that is open at both the distal end side and the proximal end side. The peripheral wall 21 is formed in a substantially regular hexagonal shape that is rounded in a cross-sectional shape cut by a plane perpendicular to the axial direction.

  Further, six reinforcing partition walls 22... Extending in the radial direction (radially) from the center in the sectional view are integrally formed in the crash box 2 at equal intervals in the circumferential direction.

  The partition wall 22 is formed continuously in the axial direction (front-rear direction) of the crash box 2. Accordingly, the front end side (front end side) opening and the base end side (rear end side) opening of the crush box 2 communicate with each other through the partition walls 22.

  With the tip portion (front end portion) of the crash box 2 configured as described above penetratingly disposed in the mounting holes 15 of the front and rear walls of the bumper reinforcement 1, the peripheral wall 21 of the crash box 2 is expanded by tube expansion described in detail later. Are formed on the front and rear of the mounting holes 15 and 15, respectively, so as to protrude radially outward (outer radial direction). The crush box 2 is fastened and fixed to the bumper reinforcement 1 by press-fitting the convex portions 25 to the peripheral edge portions of the mounting holes 15, 15 in the bumper reinforcement 1.

  In the present embodiment, the convex portions 25 are provided along the circumferential direction over substantially the entire circumference of the crash box 2 except for the positions corresponding to the partition walls 22. In other words, six convex portions 25... Extending in the circumferential direction are formed at equal intervals in the circumferential direction at the front and rear positions of the mounting holes 15, 15 on the outer circumferential surface of the crash box 2.

  As shown in FIGS. 4 and 5, the stay member 3 is made of aluminum, an aluminum alloy, a steel material, or the like. Furthermore, the stay member 3 is formed of a molded product such as press working, die casting, forging, or the like.

  The stay member 3 has a substantially hat shape in which a flange 33 is formed at the opening edge of the cup-shaped portion 30 formed in a cup shape so as to project outward (in the outer diameter direction). The cup-shaped portion 30 has a cylindrical peripheral wall 31 and a bottom wall 32 that is integrally formed so as to close a base end (rear end side) opening of the peripheral wall 31.

  In this stay member 3, the bottom wall 32 functions as a member mounting portion (bracket) to which a member such as a tow hook can be mounted, and the flange 33 functions as a bumper stay that can be fixed to the vehicle structure. .

  The peripheral wall 31 of the stay member 3 is formed in a substantially regular hexagonal shape corresponding to the inner peripheral shape of the base end portion of the crash box 2. Accordingly, the base end portion of the crash box 2 can be accommodated in the peripheral wall 31, that is, in the cup-shaped portion 30. In other words, the cup-shaped portion 30 of the stay member 3 can be externally fitted to the base end portion of the crash box 2.

  On the outer surface (rear surface) of the bottom wall 32 of the stay member 3, a traction hook mounting nut 5 is provided so that the axial center direction coincides with the axial direction of the stay member 3.

  A front end side opening (front end side opening) of the screw hole 51 in the nut 5 is opened to the inner surface of the bottom wall 32 of the stay member 3, that is, the inner side of the cup-shaped portion 30. Accordingly, the male screw 63 of the pulling hook 6 inserted from the opening of the stay member 3 can be screwed into the screw hole 51 of the nut 5.

  In the present embodiment, a female screw is constituted by the screw hole 51 of the nut 5.

  In addition, a wedge insertion hole 35 is formed in the central portion of the bottom wall 32 of the stay member 3 except for the attachment region of the nut 5. As will be described in detail later, the wedge insertion hole 35 is provided in order to prevent the wedge 83 from interfering with the bottom wall 32 of the stay member 3 during tube expansion processing.

  Here, in the present embodiment, the wedge insertion hole 35 constitutes a mold interference prevention hole.

  In the present invention, the flange 33 in the stay member 3 does not necessarily have to be formed integrally with the cup-shaped portion 30, and the cup-shaped portion and the flange (bumper stay) are prepared separately, and can be appropriately used. Both fixing means may be connected and fixed using a simple fixing means. In this case, the cup-shaped portion and the flange (bumper stay) can be made of different materials.

  Similarly, in the present invention, the bottom wall 32 in the cup-shaped portion 30 does not necessarily have to be formed integrally with the peripheral wall 31. The peripheral wall and the bottom wall are separately manufactured, and an appropriate fixing method is used. It is also possible to connect and fix both. In this case, the peripheral wall and the bottom wall can be made of different materials.

  The stay member 3 having the above-described configuration is arranged so that the base end portion of the crush box 2 on one side is accommodated in the cup-shaped portion 30. Thereby, the base end side opening of the crash box 2 is made by the bottom wall 32 of the stay member 3. In this state, the inner surface of the bottom wall 32 of the stay member 3 is disposed so as to contact the base end surface of the crash box 2.

  And in this state, the convex parts 26 and 36 which protrude in an outer-diameter direction are formed in the surrounding wall 21 of the crash box 2 and the surrounding wall 31 of the stay member 3, respectively by the pipe expansion process mentioned later. As a result, the convex portion 26 of the crash box 2 is press-fitted and fixed inside the convex portion 36 of the stay member 3, and the stay member 3 is fastened and fixed to the crash box 2.

  In the present embodiment, the convex portions 26 and 36 are provided along the circumferential direction over substantially the entire circumference of the crash box 2 and the stay member 3 (cup-shaped portion 30) except for positions corresponding to the partition walls 22. ing. In other words, six convex portions 26 and 36 extending in the circumferential direction are formed at equal intervals in the circumferential direction on the outer peripheral surface of the base end side of the crash box 2 and the peripheral wall 31 of the stay member 3.

  Further, in the state where the stay member 3 is assembled to the base end portion of the crash box 2 in this way, the flange 33 of the stay member 3 projects in the outer diameter direction at a predetermined position of the base end portion of the crash box 2. Be placed.

  Further, the nut 5 provided on the bottom wall 32 of the stay member 3 is arranged correspondingly between any two adjacent partition walls 22, 22 in the crash box 2. Therefore, the periphery of the mounting portion of the nut 5 communicates with the opening on the front end side of the crash box 2 through any one of the two partition walls (predetermined partition walls) 22 and 22 of the crash box 2.

  The bumper stay 4 provided in the crush box 2 arranged on the left side of FIG. 1 is formed of a plate-like molded product made of aluminum or an alloy thereof.

  As shown in FIG. 5B, the bumper stay 4 has a mounting hole 46 formed at the center thereof. The inner peripheral shape of the mounting hole 46 is formed in a substantially regular hexagonal shape corresponding to the outer peripheral shape of the base end portion of the crash box 2 on the other side (left side in FIG. 1). The base end of 2 can be loosely inserted.

  Then, with the base end portion of the crash box 2 on the other side penetrating through the mounting hole 46 of the bumper stay 4, the outer diameter direction is formed before and after the mounting hole 46 in the peripheral wall 21 of the crash box 2 by tube expansion processing described later. Convex portions 26, 26 projecting from each other are formed. As a result, the convex portions 26 and 26 are brought into pressure contact with the peripheral portion of the mounting hole 46 in the bumper stay 4, and the bumper stay 4 is fastened and fixed to the crash box 2 on the other side.

  In the present embodiment, the convex portion 26 of the crash box 2 on the other side is provided along the circumferential direction over substantially the entire circumference of the crash box 2 except for the position corresponding to the partition walls 22. In other words, six convex portions 26 extending in the circumferential direction are formed at equal intervals in the circumferential direction at front and rear positions of the mounting hole 46 on the outer circumferential surface of the crash box 2.

  In the present embodiment, the operation of connecting and fixing the bumper reinforcement 1 to the crash boxes 2 and 2, the operation of connecting and fixing the stay member 3 to the crash box 2 on one side, and the connection of the bumper stay 4 to the crash box 2 on the other side The fixing operation is performed by tube expansion processing (expanding processing) using a tube expansion die (expanding die).

  Further, in the present embodiment, one side (right side in FIG. 1) of the bumper reinforcement 1 is connected and fixed to the crash box 2 on one side, and the stay member 3 is connected and fixed to the crash box 2 on one side. The work to be performed (tube expansion processing) is performed at the same time. In this embodiment, this pipe expansion process is referred to as one-side pipe expansion process.

  In the present embodiment, the other side (left side in FIG. 1) of the bumper reinforcement 1 is connected and fixed to the crash box 2 on the other side, and the bumper stay 4 is connected and fixed to the crash box 2 on the other side. The work to be performed (tube expansion processing) is performed simultaneously. In this embodiment, this pipe expansion process is referred to as the other pipe expansion process.

  6 is a plan view showing the bumper beam of this embodiment in a state where a tube expansion die is inserted, FIG. 7 is a front view thereof, FIG. 8A is a cross-sectional view taken along line AA in FIG. 7, and FIG. It is B line sectional drawing. In order to facilitate understanding of the invention, the front view of FIG. 7 is shown upside down.

  As shown in these drawings, the tube expansion die 7 that performs tube expansion processing on one side includes a plurality of (six) split dies 71 that are respectively inserted between the partition walls 22 in the crash box 2. . The sectional shape of each split mold 71 is formed in a substantially fan shape corresponding to the inner peripheral shape between the partition walls 22. Each split mold 71 has the same cross-sectional shape.

  Further, on the outer peripheral surface of each split mold 71..., Tip side molding convex portions 75 and 75 are formed corresponding to the positions where the bumper reinforcement 1 side convex portions 25 and 25 are formed in the crash box 2. Further, on the outer peripheral surface of each split mold 71..., A base end side forming convex portion 76 is formed corresponding to the position where the crush box 2 and the convex portions 26 and 36 of the stay member 3 are formed.

  Further, each split mold 71 is provided with wedge insertion portions 73 along the axis. Each wedge insertion part 73 is formed in a substantially 1/6 hexagonal pyramid shape so that the wedge insertion parts 73 of each split mold 71.

  Further, the mandrel 8 for expanding the diameter of the tube expansion die 7 has wedges 83 corresponding to the wedge insertion portions 73 of the split dies 71. Each wedge 83 is formed in a tapered shape on the tip side (insertion direction side), and is formed corresponding to the inner peripheral shape of each wedge insertion portion 73. That is, each wedge 83 is formed in a substantially 1/6 regular hexagonal pyramid shape so that the wedges 83 are formed in a substantially regular hexagonal pyramid shape when all the wedges are combined. The taper angle at the outer peripheral surface of each wedge 83 is set equal to the taper angle of the inner peripheral surface at each wedge insertion portion 73.

  Further, among the plurality (six) of wedges 83, the wedge 83 corresponding to the position of the nut 5 of the stay member 3 corresponds to a region where the wedge insertion hole 35 is not formed in the bottom wall 32 of the stay member 3. The wedge 83 is made shorter than the other wedges 83 by cutting off the tip (insertion end). This is to prevent the wedge 83 of the tube expansion die 7 from interfering with the bottom wall 32 of the stay member 3 as will be described in detail later.

  When the tube expansion mold 7 having this configuration is used, when one side of the tube expansion processing is performed, the tip portion of the crash box 2 on one side is disposed through the mounting hole 15 on one side of the bumper reinforcement 1, The cup-shaped portion 30 of the stay member 3 is externally fitted to the proximal end portion of the crash box 2 on one side. At the time of this external fitting, the stay member 3 can be aligned with the crash box 2 by bringing the inner surface of the bottom wall 32 of the stay member 3 into contact with the proximal end surface of the crash box 2 on one side. Therefore, the flange 33 is accurately arranged at a desired position with respect to the crash box 2 simply by fitting the stay member 3 to the crash box 2.

  In this state, as shown in FIGS. 6 to 8, the split dies 71 of the tube expansion die 7 are inserted between the partition walls 22 of the crush box 2 from the front end side (front end side) opening. To do. In this case, the forming convex portions 75 and 76 of each split mold 71 are arranged in regions (projection forming scheduled regions) where the crush box 2 and the convex portions 25, 26 and 36 of the stay member 3 are to be formed.

  In this state, by pressing the mandrel 8 in the axial direction, the wedges 83 are forcibly pushed into the wedge insertion portions 73 of the split dies 71. As a result, the split dies 71 are moved in the outer diameter direction, and the projection forming regions of the crash box 2 and the stay member 3 are expanded (expanded).

  In this tube expansion process, the projected portion formation regions of the crash box 2 and the stay member 3 are locally expanded in the radial direction, and the above-described projected portions 25, 26, and 36 are formed on the crash box 2 and the stay member 3. Is done. In this way, the connecting and fixing work of one side of the crash box 2 and the bumper reinforcement 1 on one side and the connecting and fixing work of the crash box 2 and stay member 3 on the one side are simultaneously performed.

  In this embodiment, when the mandrel 8 is pushed in, the wedges 83 can be reliably prevented from interfering with the bottom wall 32 of the stay member 3. That is, as described above, of the plurality (six) of wedges 83 of the mandrel 8, the wedge 83 disposed at a position corresponding to the nut 5 of the stay member 3 is cut at the tip thereof, and the other wedges are cut. It is shorter than 83. Further, a wedge insertion hole 35 is formed in a region of the bottom wall 32 of the stay member 3 where the nut 5 is not attached. Therefore, when the mandrel 8 is pushed in, the wedge 83 corresponding to the nut 5 does not reach the bottom wall 32 to which the nut 5 is attached, and interferes with the bottom wall 32 and the nut 5 of the stay member 3. Can be prevented. Further, the other wedges 83 can be prevented from interfering with the bottom wall 32 of the stay member 3 by being inserted into the wedge insertion hole 55.

  After forming the convex portions 25, 26, and 36, the mandrel 8 is extracted, the diameter of the tube expansion mold 7 is reduced, and the crush box 2 is extracted.

  The pipe expansion process on the other side is performed in substantially the same manner as the pipe expansion process on the one side. As the tube expansion die 7 used in the tube expansion processing on the other side, a plurality of split dies 83 are all of the same length. Further, the proximal-side forming convex portions 76 in the split dies 83 are respectively provided in front of and behind the mounting holes 46 of the bumper stay 4 on the other side. The other configuration of the tube expansion mold 7 on the other side is substantially the same as that of the tube expansion mold 7 on the one side described above.

  The operation procedure of the tube expansion process is substantially the same. That is, the front end portion of the crash box 2 on the other side is disposed through the mounting hole 15 on the other side portion of the bumper reinforcement 1, and the base end portion of the crash box 2 on the other side is disposed in the mounting hole for the bumper stay 4 on the other side. 46 is disposed through. In this state, the split molds 71 of the tube expansion mold 7 are inserted and arranged between the partition walls 22 of the crush box 2 and the mandrel 8 is pushed in. As a result, the projection forming region of the crush box 2 is locally expanded to form the projections 25 and 26 protruding in the outer diameter direction. In this way, the operation of connecting and fixing the bumper reinforcement 1 of the other crash box 2 and the operation of fixing and connecting the bumper stay 4 of the other crash box 2 are performed simultaneously.

  In the present invention, the tube expansion molds 7 and 7 are disposed in the crush boxes 2 and 2 on the one side and the other side, and the mandrel 8 and 8 are simultaneously press-fitted, thereby expanding the tube on the one side, The pipe expansion process on the other side can be performed simultaneously. In this case, productivity can be further improved.

  As described above, the bumper reinforcement 1, the stay member 3, and the bumper stay 4 are connected and fixed to the crash box 2 to assemble the bumper beam (vehicle impact absorbing member).

  In this bumper beam, the crash box 2 on one side is assembled to the vehicle body via the flange (bumper stay) 33 of the stay member 3, and the crash box 2 on the other side is attached to the vehicle body via the bumper stay 4. Assembled. That is, the flange 33 and the bumper stay 4 are respectively fixed to the tips of both side frames (both side members) (not shown) as a vehicle structure by bolting, welding, or the like. As a result, the bumper beam is assembled to the vehicle body.

  In an automobile in which the bumper beam is assembled, when an impact is applied to the bumper reinforcement 1 due to a collision, the crash box 2 is compressed and deformed in the axial direction (vehicle longitudinal direction), and the impact energy is absorbed by the deformation. It is like that.

  On the other hand, as shown in FIGS. 4 and 5A, the tow hook 6 is cut into the shaft portion 61, the hook body 62 provided at the tip of the shaft portion 61, and the base end portion (insertion side end portion) of the shaft portion 61. A male screw 63 is provided.

  And when attaching the traction hook 6 to the automobile to which the bumper beam is assembled, the shaft portion 61 of the traction hook 6 is inserted with the male screw 63 side as the insertion side through the tip side opening of the crash box 2 on one side. It is inserted between the predetermined partition walls 22 and 22 in the crash box 2. When the male screw 63 of the traction hook 6 reaches the nut 5, the traction hook 6 is rotated and the male screw 63 is screwed into the screw hole 51 of the nut 5 and fixed. As a result, the tow hook 6 is assembled to the vehicle body with the hook main body 62 disposed in front of the tip (front end) of the crash box 2.

  Moreover, what is necessary is just to perform operation contrary to the above, when removing the tow hook 6. FIG. That is, the tow hook 6 is rotated to loosen the screw, the male screw 63 is removed from the nut 5, and then the tow hook 6 is extracted from the front end side opening of the crash box 2.

  As described above, according to the bumper beam of the present embodiment, the stay member 3 integrally having the cup-shaped portion 30 provided with the nut 5 on the bottom wall 32 and the flange 33 is assembled to the crash box 2. Therefore, only by assembling the stay member 3 to the crash box 2, the two members of the bottom wall 32 functioning as a tow hook mounting member (bracket) and the flange 33 functioning as a bumper stay for mounting to the vehicle are provided. Can be installed. Therefore, as compared with the case where the bracket and the bumper stay are assembled separately, the assembling work can be performed easily and smoothly, and the productivity can be improved and the cost can be reduced.

  Furthermore, in the bumper beam of the present embodiment, when the stay member 3 is externally fitted to the crash box 2, the stay member 3 can be simply attached by contacting the bottom wall 32 of the stay member 3 with the base end surface of the crash box 2. Positioning with respect to the crash box 2 can be aimed at. Therefore, the assembling work can be performed more easily and smoothly, and the productivity can be improved and the cost can be reduced more reliably.

  Further, according to the bumper beam of the present embodiment, the projecting portions 26 and 36 are formed on the crash box 2 and the stay member 3 by the tube expansion process using the tube expansion mold 7, so that the stay member 3 is attached to the crash box 2. At the same time as connecting and fixing, the bumper reinforcement 1 is connected and fixed to the crash box 2. In this way, the bumper reinforcement 1, the crash box 2 and the stay member 3 can be assembled in a single process, the assembly work can be performed more easily, and productivity and cost reduction can be further ensured. Can be planned.

  Furthermore, since the stay member 3 has a simple hat-like structure, the structure of the entire bumper beam can be simplified.

  In the present embodiment, the crush box 2 is expanded, and the bumper reinforcement 1, the stay member 3, and the bumper stay 4 are connected and fixed to the crush box 2, so that the crush box 2 is relatively free. A cross-sectional shape can be used. That is, the bumper reinforcement 1, the stay member 3, and the bumper stay 4 can be reliably connected and fixed even in the crash box 2 in which a plurality of reinforcing partition walls 22 are formed as in the present embodiment. For this reason, the strength of the crash box 2 can be increased by changing the shape of the partition wall 22 or increasing the number thereof. Therefore, it is not necessary to increase the thickness and size of the crash box, and the crash box 2 can be reduced in size and weight and the cost can be further reduced.

  Furthermore, by adjusting the shape and number of the partition walls 22, it is possible to appropriately control the behavior (crushing method) at the time of crushing deformation (compression deformation) of the crash box 2 due to a collision. For this reason, for example, the difference between the initial maximum load at the time of collision and the average load after the initial load can be reduced, and the EA efficiency can be improved while increasing the amount of energy absorption (EA). The shock absorbing property can be obtained with certainty.

  In the present embodiment, since the base end surface (rear end surface) of the crash box 2 is brought into contact with the bottom wall 32 of the stay member 3, the pulling force that pulls the pulling hook 6 attached to the stay member 3 is It acts to push the base end surface of the crash box 2 forward through the bottom wall 32 of the stay member 3. Since this tensile force acts on the vehicle structure through the base end face of the crash box 2 and the flange 33 of the stay member 3, it is possible to reliably prevent a problem that the crash box 2 is deformed. Further, the pushing force for pushing the traction hook 6 does not act directly on the crash box 2 but acts directly on the vehicle side frame (structure) via the stay member 3. Therefore, it is possible to reliably prevent the crash box 2 from being deformed against this pushing force. As described above, the force applied to the pulling hook 6 can surely prevent a problem such that the crash box 2 and the bumper reinforcement 1 are deformed. Therefore, it is possible to reliably perform the towing work or the vehicle body fixing work using the tow hook 6 without any trouble.

  In the present embodiment, since the base end surface of the crash box 2 is supported by the side frame as the vehicle structure via the stay member 3, the impact load applied to the bumper reinforcement 1 due to the collision is applied to the crash box 2. It acts to reliably compress and deform (crush deformation), and the impact energy can be absorbed by the deformation. For this reason, it is possible to reliably prevent a problem that the stay member 3 is inadvertently deformed by the impact load and fluctuates the desired EA amount, and excellent shock absorption characteristics can be reliably maintained.

  In this embodiment, it is only necessary to attach the stay member 3 between the inner surface of the peripheral wall of the stay member 3 and the outer surface of the peripheral wall of the crash box 2 with a small attachment strength (joint strength) that prevents the stay member 3 from coming out of the crash box 2. .

  That is, in the bumper beam of the present embodiment, the axial direction (vehicle longitudinal direction) acting on the bottom wall 32 such as the pushing force or tensile force applied through the traction hook 6 or the pushing force when the crash box 2 is compressed and deformed. This force does not act directly between the inner peripheral wall surface of the stay member 3 and the outer peripheral surface of the crash box 2 but acts on the vehicle structure via the flange 33 of the stay member 3. That is, regardless of the bonding strength between the inner peripheral wall surface of the stay member 3 and the outer peripheral wall surface of the crash box 2, the force acting in the axial direction can be reliably received by the vehicle structure.

  Therefore, the joining strength between the peripheral walls 21 and 31 of the crash box 2 and the stay member 3 can be reduced. For this reason, the load at the time of the said pipe expansion process for connecting and fixing between the crash box 2 and the stay member 3 can be made small, and the pipe expansion process can be performed smoothly.

  Further, in the present embodiment, the bumper beam constituent members 1 to 4 are connected and fixed by tube expansion processing. In other words, they are not fixed by welding or bolting. Therefore, an increase in costs associated with welding can be prevented, costs can be further reduced, and inadvertent shear failure at the time of collision caused by bolting and a reduction in assembly workability can be prevented, resulting in a further excellent impact. Absorption characteristics can be obtained, and productivity can be further improved.

  In the above embodiment, the stay member 3 has the nut 5 disposed on the outer surface (rear surface) of the bottom wall 32. However, the present invention is not limited to this, and in the present invention, as shown in FIG. In addition, the nut 5 may be disposed on the inner surface (front surface) of the bottom wall 32 of the stay member 3.

  In this case, as the tube expansion die 7 used for connecting and fixing the stay member 3 to the crush box 2, it is preferable to use one as shown in FIG. 10.

  That is, since the nut 5 disposed on the inner surface of the bottom wall 32 of the stay member 3 is disposed on the distal end side with respect to the base end position in the crash box 2, the split mold 71 of the tube expansion die 7 is attached to the nut 5. There is a possibility that the split mold 71 cannot be inserted due to interference. For this reason, in this modified example, among the plurality of split dies 71 of the tube expansion mold 7, a short one with the tip (insertion side end) cut off is used as the split mold 71 corresponding to the nut 5.

  If this pipe expansion die 7 is used, the pipe expansion processing can be performed without any trouble without causing the split mold 71 to interfere with the nut 5.

  In this pipe expansion mold 7, since the split mold 71 does not exist in the portion corresponding to the nut 5, the connection fixing convex portion 26, in the portion corresponding to the nut 5 in the crash box 2 and the stay member 3. 36 cannot be formed. However, the portions where the convex portions 26 and 36 are not formed are only a part in the circumferential direction, and the connecting convex portions 26 and 36 can be formed in many remaining portions without hindrance. Therefore, the stay member 3 can be reliably connected and fixed to the crash box 2 as described above.

  Moreover, in the said 1st Embodiment, although the thing of the push (push) type which pushes a mandrel into a metal mold | die is used as a pipe expansion metal mold | die, it is not restricted only to that, If this invention can be expanded, how A wide tube mold may be used. For example, a pull-type tube expansion die that pulls the mandrel from the die may be used.

Second Embodiment
FIG. 11 is a side sectional view showing the vicinity of one of the crash boxes in a vehicle bumper beam according to a second embodiment of the present invention in a state where a tow hook is attached, and FIG. FIG.

  As shown in these drawings, the stay member 3 used in the vehicle bumper beam of the second embodiment is formed so that the inner wall size of the peripheral wall 31 in the cup-shaped portion 30 is larger than that of the peripheral wall 31 of the first embodiment. Thus, the base end side of the crash box 2 can be accommodated in the cup-shaped portion 30 with a margin. Further, an inward flange-like retaining protrusion 34 is formed on the opening edge of the stay member 3 over the entire area in the circumferential direction so as to protrude in the inner diameter direction.

  Then, in a state in which the base end side of the crash box 2 is accommodated in the cup-shaped portion 30 of the stay member 3, the tube expansion processing using the tube expansion mold 7 at a position corresponding to the cup-shaped portion 30 in the peripheral wall 21 of the crash box 2. Thus, a convex portion 26 protruding in the outer diameter direction is formed. In this structure, when the retaining protrusion 34 is locked to the convex portion 26, the stay member 3 is restricted from moving backward relative to the crash box 2, thereby preventing the retaining member 3 from coming off. Needless to say, the stay member 3 is restricted from moving forward relative to the crash box 2 by the bottom wall 32 of the stay member 3 being in contact with and locked to the base end surface of the crash box 2. Thus, the stay member 3 is connected and fixed to the crash box 2 in a state where movement in the front-rear direction is restricted.

  In this pipe expansion process, no convex portion is formed on the peripheral wall 31 of the stay member 3.

  In the bumper beam of the second embodiment, the other configuration is substantially the same as that of the first embodiment. Therefore, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  In the bumper beam of the second embodiment, the same effect as that of the first embodiment is obtained, and the retaining protrusion 34 functions as a reinforcing member. Therefore, the strength of the stay member 3, particularly the tensile direction and the pushing direction. The strength in the (axial direction) increases. Therefore, it is possible to more reliably prevent the deformation of the stay member 3 against the force acting in the axial direction, and to perform the towing work or the vehicle body fixing work using the towing hook 6 more reliably. At the same time, the crash box 2 can be smoothly compressed and deformed at the time of collision, and the shock absorption characteristics can be further improved.

  Furthermore, since the stay member 3 is not expanded but only the crash box 2 is expanded, the load at the time of expanding the tube can be reduced and the expansion can be easily performed.

<Third Embodiment>
FIG. 13 is a side sectional view showing the vicinity of one of the crash boxes in the bumper beam for a vehicle according to the third embodiment of the present invention with the traction hook attached.

  As shown in the figure, in the third embodiment, the stay member 3 is connected to the crash box 2 using an adhesive 37. That is, in the third embodiment, the outer surface of the peripheral wall of the crash box 2 and the inner surface of the peripheral wall of the stay member 3 are bonded to each other through the adhesive 37 without forming the convex portion by the pipe expansion process on the crash box 2 and the stay member 3. doing.

  As the adhesive 37, any adhesive can be used as long as it can adhere to the extent that the stay member 3 does not come out of the crash box 2. That is, as described in the first embodiment, the force in the axial direction (vehicle longitudinal direction) acting on the bottom wall 32 of the stay member 3 does not act directly between the crash box 2 and the peripheral wall of the stay member 3, Since it acts on the vehicle structure or the like via the flange 33 of the stay member 3, the bonding strength between the crash box 2 and the peripheral wall of the stay member 3 may be small. Therefore, it is possible to bond and fix between the peripheral walls of the members 2 and 3 by using a very general well-known adhesive 37.

  In this 3rd Embodiment, since the other structure is substantially the same as the said 1st, 2nd embodiment, the same code | symbol is attached | subjected to the same part and duplication description is abbreviate | omitted.

  In the bumper beam of the third embodiment, the same function and effect can be obtained as described above. Furthermore, since the stay member 3 is bonded to the crash box 2 with the adhesive 37, both the members 2 and 3 can be easily assembled.

  As shown in FIG. 13, a wedge insertion hole 35 is formed in the bottom wall 32 of the stay member 3 of the third embodiment, but the stay member 3 is attached to the crash box 2 as in the third embodiment. When joining with the adhesive 37, the wedge insertion hole 35 is not necessarily provided.

<Fourth embodiment>
FIG. 14 is a side cross-sectional view showing the vicinity of one crash box in a vehicle bumper beam according to a fourth embodiment of the present invention in a state where a tow hook is attached.

  As shown in the figure, in the fourth embodiment, the corresponding portions of both the peripheral walls 21 and 31 of the crash box 2 and the stay member 3 are subjected to a known contraction process using a known contraction mold so as to be locally applied. Thus, convex portions 28 and 38 projecting in the inner diameter direction are formed at corresponding portions of the peripheral walls 21 and 31 by being recessed inward. Thus, the convex portion 38 of the stay member 3 is press-fitted and fixed inside the convex portion 28 of the crash box 2, and the stay member 3 is connected and fixed to the crash box 2.

  In the fourth embodiment, the inward convex portions 28 and 38 are arranged in the circumferential direction over substantially the entire circumference of the crash box 2 and the stay member 3 (cup-shaped portion 30) except for the positions corresponding to the partition walls 22. It is provided along. In other words, six inwardly protruding portions 28 and 38 extending in the circumferential direction are formed at equal intervals in the circumferential direction on the outer peripheral surface of the base end side of the crash box 2 and the peripheral wall 31 of the stay member 3.

  In this 4th Embodiment, since another structure is substantially the same as the said 1st-3rd embodiment etc., the same code | symbol is attached | subjected to the same or an equivalent part, and duplication description is abbreviate | omitted.

  In the bumper beam of the fourth embodiment, the same function and effect can be obtained as described above.

<Other variations>
In the embodiment and the like, as a method of connecting the stay member 3 to the crush box 2, a method using tube expansion processing as in the first embodiment, a method using contraction processing as in the fourth embodiment, Although a method using an adhesive is employed as in the third embodiment, these methods may be used in combination. For example, after supplying an adhesive material between the crash box 2 and the stay member 3, the adhesive material and the tube expansion process are used together by forming convex portions by tube expansion processing and tube contraction processing on both members 2 and 3. Alternatively, both the members 2 and 3 may be connected and fixed by using an adhesive and a reduced tube processing together.

  Further, the method of connecting the members 2 and 3 by the retaining protrusion 34 as in the second embodiment and the method of connecting using an adhesive as in the third embodiment may be used in combination. .

  In the above embodiment, a crush box having a substantially regular hexagonal cross section is used as the crush box. However, the present invention is not limited to this, and a crush box having another cross sectional shape may be used in the present invention. For example, the cross section may be circular, elliptical, oval, polygonal other than hexagonal, or irregular.

  In the above embodiment, the case where six partition walls are formed in the crush box has been described as an example. However, in the present invention, the number of partition walls is not limited, and the partition walls are not necessarily limited. There is no need to provide it.

  Furthermore, the shape of the partition wall is not particularly limited, and may be formed in any shape. For example, the partition wall is not necessarily formed radially along the radial direction in a cross-sectional view, and may be formed so as not to pass through the axis.

  In the above embodiment, the screw hole of the nut provided in the bottom wall of the stay member is configured as a female screw. However, the present invention is not limited thereto, and in the present invention, the screw hole is provided in the bottom wall (bracket) of the stay member. Direct threading may be used to configure the threaded hole as a female thread.

  Moreover, in the said embodiment, although the cross-section of a surrounding wall is a rectangular thing as a bumper reinforcement, it is not restricted to it, In this invention, you may use the bumper reinforcement of another cross-sectional shape. For example, the cross section may be triangular, pentagonal or more polygonal, circular, elliptical, oval, or irregular.

  Furthermore, the partition walls provided in the bumper reinforcement are not limited to one, and two or more partition walls may or may not be provided.

  In the present embodiment, the bumper reinforcement is formed by an extruded product, a drawn product, or the like. However, the present invention is not limited thereto, and in the present invention, the bumper reinforcement is formed by, for example, a pressed product of a metal plate. Is also possible.

  In the above embodiment, the case where the bumper beam of the present invention is used as a structure inside the bumper has been described as an example. However, the present invention is not limited thereto, and the bumper beam of the present invention is also applied to a front underlamp protector of a large vehicle. Can be applied. In this case, the front end side of the crash box is the vehicle rear side, and the base end side of the crash box is the vehicle front side.

  Needless to say, the bumper beam of the present invention can also be used for a bumper provided at the rear end of an automobile.

  The vehicle impact absorbing member of the present invention can be applied to a structure inside a bumper of an automobile.

1: bumper reinforcement 2: crash box 21: peripheral wall 22: partition wall 25, 26: convex part 3: stay member 30: cup-shaped part 31: peripheral wall 32: bottom wall 33: flange 34: retaining protrusion 36: convex part 37 : Adhesive 51: Screw hole (female screw)
6: Tow hook

Claims (12)

A cylindrical crash box,
A stay member provided at the opening edge of the cup-like portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The base end side of the crash box is accommodated in the cup-shaped portion, and the stay member is fixed to the crash box in a state where the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion ,
Protruding portions protruding in the outer diameter direction are formed by tube expansion processing using a tube expansion mold at positions corresponding to each other on both peripheral walls of the crash box and the cup-shaped portion, so that the cup-shaped portion is A shock absorbing member for a vehicle which is fastened and fixed to a crash box . A cylindrical crash box,
A stay member provided at the opening edge of the cup-like portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The base end side of the crash box is accommodated in the cup-shaped portion, and the stay member is fixed to the crash box in a state where the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion,
Protruding portions projecting in the inner diameter direction are formed at the positions corresponding to each other on the peripheral walls of the crash box and the cup-shaped portion by a tube-reducing process using a tube-reducing mold, whereby the cup-shaped portion is A vehicle impact absorbing member, which is fastened and fixed to the crash box. The vehicle impact absorbing member according to claim 1 or 2 , wherein a female thread for attaching a pulling hook is provided on a bottom wall of the cup-shaped portion. The impact absorbing member for a vehicle according to any one of claims 1 to 3 , wherein the cup-shaped portion is fixed to the crash box with an adhesive. The impact absorbing member for a vehicle according to any one of claims 1 to 4 , wherein a partition wall partitioning the interior of the crash box is formed so as to extend along an axial direction. The vehicle impact absorbing member according to any one of claims 1 to 5 , wherein a flange of the stay member is formed integrally with the cup-shaped portion. A cylindrical crash box,
Bumper reinforcement,
A stay member provided at the opening edge of the cup-like portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The bumper reinforcement is attached to the tip side of the crash box,
The base end side of the crash box is accommodated in the cup-shaped portion, and the stay member is fixed to the crash box in a state where the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion ,
Protruding portions protruding in the outer diameter direction are formed by tube expansion processing using a tube expansion mold at positions corresponding to each other on both peripheral walls of the crash box and the cup-shaped portion, so that the cup-shaped portion is A bumper beam for a vehicle characterized by being fastened and fixed to a crash box . A cylindrical crash box,
Bumper reinforcement,
A stay member provided at the opening edge of the cup-like portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The bumper reinforcement is attached to the tip side of the crash box,
The base end side of the crash box is accommodated in the cup-shaped portion, and the stay member is fixed to the crash box in a state where the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion,
Protruding portions projecting in the inner diameter direction are formed at the positions corresponding to each other on the peripheral walls of the crash box and the cup-shaped portion by a tube-reducing process using a tube-reducing mold, whereby the cup-shaped portion is A bumper beam for a vehicle, which is fastened and fixed to the crash box. A cylindrical crash box,
A stay member provided at the opening edge of the cup-shaped portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The stay member is fixed to the crash box in a state where the base end side of the crash box is accommodated in the cup-shaped portion and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion. ,
Protruding portions protruding in the outer diameter direction are formed by tube expansion processing using a tube expansion mold at positions corresponding to each other on both peripheral walls of the crash box and the cup-shaped portion, so that the cup-shaped portion is A method of manufacturing a shock absorbing member for a vehicle, wherein the method is fastened and fixed to a crash box . A cylindrical crash box,
A stay member provided at the opening edge of the cup-shaped portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
The stay member is fixed to the crash box in a state where the base end side of the crash box is accommodated in the cup-shaped portion and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion. ,
Protruding portions projecting in the inner diameter direction are formed at the positions corresponding to each other on the peripheral walls of the crash box and the cup-shaped portion by a tube-reducing process using a tube-reducing mold, whereby the cup-shaped portion is A method of manufacturing a shock absorbing member for a vehicle, wherein the method is fastened and fixed to the crash box. A cylindrical crash box,
Bumper reinforcement,
A stay member provided at the opening edge of the cup-shaped portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
Attaching the bumper reinforcement to the tip side of the crash box,
The stay member is fixed to the crash box in a state where the base end side of the crash box is accommodated in the cup-shaped portion and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion. ,
Protruding portions protruding in the outer diameter direction are formed by tube expansion processing using a tube expansion mold at positions corresponding to each other on both peripheral walls of the crash box and the cup-shaped portion, so that the cup-shaped portion is A bumper beam manufacturing method for a vehicle, wherein the bumper beam is fastened and fixed to a crash box . A cylindrical crash box,
Bumper reinforcement,
A stay member provided at the opening edge of the cup-shaped portion so that a flange that can be fixed to the vehicle structure projects in the outer diameter direction;
Attaching the bumper reinforcement to the tip side of the crash box,
The stay member is fixed to the crash box in a state where the base end side of the crash box is accommodated in the cup-shaped portion and the base end surface of the crash box is in contact with the bottom wall of the cup-shaped portion. ,
Protruding portions projecting in the inner diameter direction are formed at the positions corresponding to each other on the peripheral walls of the crash box and the cup-shaped portion by a tube-reducing process using a tube-reducing mold, whereby the cup-shaped portion is A bumper beam manufacturing method for a vehicle, wherein the bumper beam is fastened and fixed to the crash box.

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