JP6651487B2 - Vehicle shock absorber - Google Patents

Description

  The present invention relates to a vehicle shock absorbing device provided in a portion of a vehicle that receives a collision load.

  2. Description of the Related Art As a vehicle shock absorbing device, a device has been developed in which a collision load receiving member such as a bumper installed at a front end portion of a vehicle is projected forward immediately before a collision with a collision object (see Patent Document 1). Specifically, a stay is provided inside the side member at the front of the vehicle so as to be movable in the vehicle front-rear direction, and a bumper fixed to the front end of the stay. During normal running, the stay is accommodated and held in the side member, and immediately before the vehicle causes a frontal collision, the stay is moved to the front of the vehicle to protrude from the front end of the side member, so that the bumper protrudes to the front of the vehicle. Activate. At the time of a collision, the stay protruding forward of the vehicle is crushed to absorb the collision energy.

JP 2005-67341 A

  However, in such a vehicle shock absorbing device, a spring mechanism including a spring restraining bracket for extending the stay forward of the vehicle, a spring, a stay restraining bracket, and a pair of protrusions protruding from the stay in the vehicle width direction. It is necessary to have a pair of arms formed with hooks for locking each projection, an initial lock mechanism composed of a motor, and a final lock mechanism composed of a stay receiving device for locking each projection of the extended stay. . In addition, the initial lock release requires driving a motor to operate a pair of arms, which results in a complicated mechanism and an expensive configuration.

  Accordingly, the present invention has been made in view of such a point, and has a simple structure of a mechanism for causing a collision load receiving member to protrude in a collision direction immediately before a collision, and a mechanism for absorbing collision energy with a simple structure. An object of the present invention is to provide a vehicle shock absorbing device that can be used.

  In order to solve the above-mentioned problems, a first invention is a collision load receiving member provided so as to receive a collision load by a vehicle body structural member of a colliding part of a vehicle body, and receiving a collision load from a collision object and transmitting the collision load to the vehicle body structural member. And an inflatable body provided between the collision load receiving member and the vehicle body structural member to form one space, and a fluid is supplied to the space in the inflatable body before the collision to increase the volume of the space. Fluid supply means for inflating the inflatable body, wherein the inflatable body has an opening along the direction of the collision load, and is fixed to one of the collision load receiving member and the vehicle body structural member. Container-shaped receiving cup, and an opening opposed to the opening of the receiving cup, slidably inserted into the receiving cup in a state where the openings face each other, and the collision load receiving member or Of the vehicle body structural member A container-shaped sliding cup fixed to the other or the other to form the space, and provided between the receiving cup and the sliding cup, and an insertion amount of the sliding cup into the receiving cup. At the maximum movement position of the collision load receiving member where the volume of the space is maximum, and an engagement means for engaging the receiving cup and the sliding cup, wherein the collision load receiving member is When receiving a collision load, of the receiving cup and the sliding cup engaged by the engaging means, the receiving cup or the sliding cup fixed to the collision load receiving member is deformed, This is a vehicle shock absorbing device that absorbs collision energy.

  In the first invention, the colliding portion may be any one of front, rear, side, and roof of the vehicle body. Further, the fluid supplied to the space in the expansion body may be any of gas, oil, air, and the like.

  According to the first aspect, when the fluid is supplied by the fluid supply means, the sliding cup slides with respect to the receiving cup forming the inflatable body, and the collision load receiving member is moved in the collision direction. Then, when the collision load receiving member reaches the maximum movement position, the receiving cup and the sliding cup are engaged by the engaging means and stopped. Thereafter, upon receiving a collision load, of the receiving cup and the sliding cup engaged by the engagement means, the one fixed to the collision load receiving member deforms and absorbs collision energy.

  Thus, the collision load receiving member is made to protrude in the collision direction immediately before the collision, and the mechanism for absorbing the collision energy has a simple structure including the receiving cup, the sliding cup, and the fluid supply means. Can be Further, at the maximum movement position of the collision load receiving member, the receiving cup and the sliding cup are engaged by the engagement means and stopped, so that the collision load receiving member can be reliably stopped at the maximum movement position.

  According to a second aspect of the present invention, in the first aspect, the engaging means is formed on a side wall of the receiving cup, and an insertion amount of the sliding cup into the receiving cup is minimized, and a volume of the space is maximized. Until the engagement hole closed by the side wall of the sliding cup and the insertion amount of the sliding cup into the receiving cup are minimized and the volume of the space is maximized, A notch line for an engaging piece formed at a position of the side wall facing the engaging hole, the engaging piece being bent outward by the pressure of the fluid in the space and pushed into the engaging hole; When the engagement piece is pushed into the engagement hole, the receiving cup and the slide cup are engaged with each other, and an internal pressure communicating with the engagement hole is formed on a side wall of the slide cup. Vehicle impacts with release holes Is a yield devices.

  According to the second invention, the engagement hole of the receiving cup and the notch line for forming the engagement piece of the sliding cup are formed in accordance with the preset maximum movement position of the collision load receiving member. With this arrangement, when the collision load receiving member reaches the maximum movement position, the engagement piece of the sliding cup is engaged with the engagement hole of the receiving cup by the pressure of the fluid, and the fluid from the fluid supply means is released from the internal pressure release hole. And flows out through the engagement hole, so that the movement can be reliably stopped.

  Thus, the engagement means for engaging the receiving cup and the sliding cup can have a simple structure and a further inexpensive configuration. Further, when the engagement piece of the sliding cup is engaged with the engagement hole of the receiving cup, the fluid from the fluid supply means flows out from the internal pressure release hole via the engagement hole, and the receiving cup or the collision cup due to the collision load. The deformation of the sliding cup proceeds smoothly, and the collision energy can be absorbed.

  In a third aspect based on the second aspect, the receiving cup has at least a pair of engagement holes along a sliding direction, and the sliding cup is simultaneously pushed into the pair of engagement holes. An impact absorbing device for a vehicle, comprising at least a pair of notch lines for the engaging pieces for forming at least a pair of the engaging pieces projecting in opposite directions along a sliding direction.

  According to the third aspect, when the collision load receiving member reaches the maximum movement position, of the pair of engagement pieces, the engagement piece facing the opposite direction to the collision load receiving member in the sliding direction is used. By engaging with the engagement hole, the movement can be surely stopped. Further, the fluid from the fluid supply means flows out of the pair of internal pressure release holes via the pair of engagement holes, and the movement can be reliably stopped.

  Further, when the vehicle collides, the engaging piece of the pair of engaging pieces, which faces in the direction of the collision load receiving member in the sliding direction, engages with the engaging hole. When the piece receives the collision load, sliding of the sliding cup with respect to the receiving cup can be stopped, and the receiving cup or the sliding cup can be deformed. Thus, a mechanism for causing the collision load receiving member to protrude in the collision direction immediately before the collision and absorbing the collision energy is provided by a pair of engagement holes of the receiving cup, a pair of engagement pieces of the sliding cup, and the fluid supply means. And a cheap structure.

  In a fourth aspect based on the third aspect, the engagement piece that receives the collision load via the engagement hole out of the pair of engagement pieces is provided at a tip end outward of the sliding cup. It is a vehicle shock absorbing device having a protruding portion that protrudes in height.

  According to the fourth aspect, even if the engagement piece that receives the collision load via the engagement hole is bent in the collision load direction by the engagement hole, the protruding portion contacts the side wall of the sliding cup and the engagement piece has Since the tip is located outside the engagement hole, the engagement between the engagement hole and the engagement piece can be maintained.

  In a fifth aspect based on the first aspect, the sliding cup is formed on a side wall of the receiving cup until the amount of the sliding cup inserted into the receiving cup is minimized and the volume of the space is maximized. Having an outwardly depressed engaging recess closed by the side wall of the sliding cup when the amount of insertion of the sliding cup into the receiving cup is minimized and the volume of the space is maximized. A notch for forming an engaging piece formed at a position of the side wall of the side opposite to the engaging recess and bent outward by the pressure of the fluid in the space and pushed into the engaging recess. And wherein the receiving cup and the sliding cup are engaged by pushing the engaging piece into the engaging concave portion.

  According to the fifth aspect, the engagement recess of the receiving cup and the notch line for the engagement piece for forming the engagement piece of the sliding cup are set in accordance with the preset maximum movement position of the collision load receiving member. With this arrangement, when the collision load receiving member reaches the maximum movement position, the engagement piece of the sliding cup is engaged with the engagement recess of the receiving cup by the pressure of the fluid, so that the movement can be reliably stopped.

  Thus, the collision load receiving member is made to protrude in the collision direction immediately before the collision, and a mechanism for absorbing the collision energy is provided by an engagement recess of the receiving cup, a notch line for an engagement piece forming an engagement piece of the sliding cup, In addition, a simple structure including the fluid supply means can be provided, and a low-cost structure can be achieved. Further, since the engagement piece of the sliding cup is engaged with the engagement recess of the receiving cup and stopped, the collision load receiving member can be reliably stopped at the maximum movement position.

  In a sixth aspect based on the fifth aspect, the receiving cup has at least a pair of the engaging recesses along a sliding direction, and the sliding cup is pushed into the pair of the engaging recesses to slide. An impact absorbing device for a vehicle, comprising at least a pair of notch lines for the engagement pieces for forming at least a pair of the engagement pieces protruding in opposite directions along a movement direction.

  According to the sixth aspect, when the collision load receiving member reaches the maximum movement position, of the pair of engagement pieces, in the sliding direction, the engagement piece facing the opposite direction to the collision load receiving member in the sliding direction. The engagement can be reliably stopped by engaging with the engagement recess. Also, when the vehicle collides, the engaging piece of the pair of engaging pieces that faces in the direction of the collision load receiving member in the sliding direction engages with the engaging concave portion, so that this engaging When the piece receives the collision load, sliding of the sliding cup with respect to the receiving cup can be stopped, and the receiving cup or the sliding cup can be deformed. Accordingly, the mechanism for causing the collision load receiving member to protrude in the collision direction immediately before the collision and absorbing the collision energy includes a pair of engagement recesses of the receiving cup, a pair of engagement pieces of the sliding cup, and a fluid supply unit. And a cheap structure.

  In a seventh aspect based on the first aspect, the engagement means is formed along a sliding direction on a side wall of the receiving cup, and an insertion amount of the sliding cup into the receiving cup is reduced from a maximum to a minimum. The collision load receiving member is longer than the moving distance of the collision load receiving member until the insertion amount of the sliding cup into the receiving cup is minimized. And protrudes outward from the side wall of the sliding cup at a predetermined height in a direction perpendicular to the sliding direction, and moves into the vertical engaging recess along the sliding direction. And a vertically long engaging concave portion, at an end opposite to the impact load receiving member, along a direction orthogonal to a sliding direction. A step portion projecting inwardly of the vertically long engagement concave portion, wherein the sliding portion slides into the receiving cup; When the amount of insertion of the cup is minimized and the volume of the space is maximized, the engaging convex portion climbs over the stepped portion, and the stepped portion of the vertically long engaging concave portion and the impact load receiving member An impact absorbing device for a vehicle, wherein the receiving cup and the sliding cup are engaged by being fitted between the opposite end edge portion and the receiving cup.

  According to the seventh aspect of the present invention, the vertical engagement recess of the receiving cup and the step formed in the vertical engagement recess, and the engagement projection of the sliding cup are adjusted to the preset maximum movement position of the collision load receiving member. When the collision load receiving member reaches the maximum movement position, the engaging convex portion of the sliding cup is opposed to the step portion of the vertically long engaging concave portion and the impact load receiving member of the vertically long engaging concave portion. It is possible to reliably stop the movement by engaging with the side edge portion.

  By this, the collision load receiving member is made to protrude in the collision direction immediately before the collision, and a mechanism for absorbing the collision energy is provided by a vertical engagement recess of the receiving cup, a step formed in the vertical engagement recess, and a sliding cup. A simple structure including the mating projections and the fluid supply means can be used, and the structure can be inexpensive. Further, the engagement convex portion of the sliding cup is engaged between the step portion of the vertically long engagement concave portion of the receiving cup and the edge portion of the vertically long engagement concave portion opposite to the impact load receiving member, Because of the stop, the collision load receiving member can be reliably stopped at the maximum movement position.

  An eighth aspect of the present invention is the vehicle according to any one of the fifth to seventh aspects, wherein the inflatable body has a discharge means for discharging the fluid when an internal pressure in the inflatable body becomes a predetermined pressure or more. It is a shock absorbing device.

  According to the eighth aspect, when the collision load receiving member reaches the maximum movement position and the internal pressure in the inflatable body exceeds a predetermined pressure, the fluid from the fluid supply means is discharged by the discharge means. , That is, the movement of the collision load receiving member can be reliably stopped.

  A ninth invention according to any one of the first to eighth inventions, is arranged so as to cover an outer peripheral side of the inflatable body, and performs expansion of the inflatable body and deformation of the receiving cup or the sliding cup. A container having a cover body that deforms to allow, the cover body houses the inflatable body, and a container having an opening that opens an inflation direction of the inflatable body so as not to prevent the inflatable body from expanding, A tubular elastic member coupled to the opening of the container, and the elastic member is folded halfway so that one side surface and one side surface face each other, and both end portions with respect to the folded position. Are arranged on the same side, and are expanded and contracted by changing the facing area between the one side surface and the one side surface.

  In the ninth invention, the cover body may be formed integrally by one member, or may be formed by a combination of a plurality of members. Further, the cover body may be connected to the inflatable body, or may be connected to the vehicle body structural member and the collision load receiving member.

  According to the ninth aspect, when the expandable body changes from the contracted normal state to the expanded state, the elastic member is extended by moving the folded position following the change. Therefore, the occupied space of the elastic member can be smaller than that in the case where the elastic member has a bellows structure. Therefore, the expansion body can be enlarged in the container. Further, when the receiving member or the sliding cup is deformed due to the collision load receiving member receiving the collision load, the elastic member is folded back along the way so that one side surface and one side surface face each other. Then, the folding position is contracted by moving. As a result, the collision energy when receiving the collision load is absorbed by the deformation of the receiving cup or the sliding cup and the contraction of the elastic member, so that the energy absorption amount of the collision energy can be increased.

  In a tenth aspect based on any one of the first to ninth aspects, the fluid supply means is fixed to the receiving cup or the sliding body fixed to the vehicle body structural member. It is.

  In order for the fluid supply means to start supplying fluid, a trigger signal from the vehicle body is required. According to the tenth aspect, the fluid supply means is fixed to the receiving cup or the sliding body fixed to the vehicle body structural member. Therefore, the fluid supply means does not relatively move with respect to the vehicle body structural member, and it is possible to eliminate the necessity of providing an extra length in a path such as a wire harness for supplying a trigger signal to the fluid supply means. That is, when the fluid supply means and the vehicle body structural member relatively move, in addition to the path length of a wire harness or the like required to supply a trigger signal when the fluid supply means does not relatively move, the path is moved by the relative movement. The length needs to be extra long. In the tenth aspect, the extra length can be made unnecessary.

1 is a plan view showing a bumper structure at a front portion of a vehicle to which a first embodiment of a vehicle impact absorbing device of the present invention is applied. FIG. 2 is a partially transparent enlarged perspective view of the bumper structure shown in FIG. 1. FIG. 3 is an enlarged cross-sectional view taken along line III-III of FIG. 1. FIG. 4 is a perspective view of the receiving cup shown in FIG. 3. FIG. 4 is a perspective view of the sliding cup shown in FIG. 3. FIG. 4 is a sectional view similar to FIG. 3, showing a state in which gas is supplied from an inflator and a bumper is being moved forward; FIG. 4 is a cross-sectional view similar to FIG. 3, showing a state in which gas has been supplied from an inflator and a forward movement of a bumper has been completed. FIG. 7 is a partially enlarged cross-sectional view of FIG. 7, showing an engagement state between the receiving cup and the sliding cup, and a state in which gas is discharged. FIG. 4 is a sectional view similar to FIG. 3, showing a state in which the bumper is moving rearward under a collision load. FIG. 4 is a cross-sectional view similar to FIG. 3, showing a state where the rearward movement of the bumper has been completed. FIG. 6 is a perspective view of a sliding cup corresponding to FIG. 5, showing a second embodiment of the vehicle shock absorbing device of the present invention. FIG. 12 is a partially enlarged cross-sectional view illustrating a normal state in which the sliding cup illustrated in FIG. 11 is mounted. FIG. 9 is a partially enlarged sectional view showing an engagement state between the receiving cup and the sliding cup corresponding to FIG. 8. FIG. 10 is a diagram illustrating an example of deformation of an engagement piece in a state in which the bumper corresponding to FIG. 9 is being moved rearward by receiving a collision load. FIG. 8 is a cross-sectional view illustrating a third embodiment of the vehicle shock absorbing device according to the present invention and corresponding to FIG. 3. It is a perspective view of the receiving cup shown in FIG. FIG. 16 is a sectional view similar to FIG. 15, showing a state in which gas is supplied from an inflator and a bumper is being moved forward; FIG. 16 is a sectional view similar to FIG. 15, showing a state in which gas has been supplied from the inflator and the forward movement of the bumper has been completed. FIG. 16 is a cross-sectional view similar to FIG. 15, showing a state in which the bumper is moving rearward under a collision load. FIG. 16 is a cross-sectional view similar to FIG. 15, showing a state where the rearward movement of the bumper has been completed. FIG. 8 is a cross-sectional view illustrating a fourth embodiment of a vehicle shock absorber according to the present invention and corresponding to FIG. 3. FIG. 22 is a perspective view of the receiving cup shown in FIG. 21. FIG. 22 is a perspective view of the sliding cup shown in FIG. 21. FIG. 22 is a cross-sectional view similar to FIG. 21, showing a state in which gas is supplied from the inflator and the bumper is moving forward. FIG. 22 is a cross-sectional view similar to FIG. 21, showing a state in which gas has been supplied from the inflator and the forward movement of the bumper has been completed. FIG. 22 is a cross-sectional view similar to FIG. 21, showing a state in which the bumper is moving rearward under a collision load. FIG. 22 is a cross-sectional view similar to FIG. 21, illustrating a state in which the rearward movement of the bumper has been completed.

  Hereinafter, a vehicle impact absorbing device according to the present invention will be described in detail with reference to the drawings based on first to fourth embodiments that embody the vehicle impact absorbing device. First, a first embodiment of a vehicle impact absorbing device according to the present invention will be described with reference to FIGS.

[First Embodiment]
1 to 5 show a schematic configuration of a first embodiment of the present invention. The first embodiment shows an example in which the vehicle shock absorbing device of the present invention is applied to an automobile front bumper. In each figure, each direction of the device in a state where it is mounted on an automobile is indicated by an arrow. In the following description, directions are described with reference to this direction.

  As shown in FIG. 1, a bumper reinforcement 1 of a front bumper, which is a collision load receiving member, is fixed to a front end of each of front members 2L and 2R disposed on the left and right sides of the vehicle as a vehicle structural member. Therefore, the collision load applied to the front bumper at the time of the vehicle collision is received by the front members 2L, 2R via the bumper reinforcement 1.

  As shown in FIGS. 2 and 3, the front end of the front member 2L is provided with a shock absorbing unit 10 which is a characteristic part of the present invention. Here, only the front member 2L is illustrated, and the illustration of the front member 2R is omitted, but each of the front members 2L and 2R includes the shock absorbing unit 10 having the same structure. The shock absorbing unit 10 includes an inflatable body 11 at the center, and the bumper reinforcement 1 is fixed to a front end of the inflatable body 11.

  The expansion body 11 is formed by combining a cylindrical receiving cup 11a and a sliding cup 11b. The receiving cup 11a has its bottom fixed to the bumper reinforcement 1 via an elastic member 15 described later, and the opening 111 (see FIG. 4) of the receiving cup 11a is directed rearward, that is, toward the base end of the front member 2L. I have. The sliding cup 11b has its bottom fixed to the bottom of the container 14, and its opening 121 (see FIG. 5) is provided in a direction facing the opening 111 of the receiving cup 11a.

  The sliding cup 11b is slidably inserted into the receiving cup 11a to form a single space 11c therebetween. Then, the volume of the space 11c is changed by changing the insertion amount of the sliding cup 11b into the receiving cup 11a. The bottom of the receiving cup 11a may be fixed to the bottom of the container 14, and the bottom of the sliding cup 11b may be fixed to the bumper reinforcement 1.

  As shown in FIG. 3 and FIG. 4, a pair of rectangular engagement holes 113 a and 113 b having two side edges parallel to the axial direction are formed on a side wall (outer peripheral surface) 112 of the cylindrical container-shaped receiving cup 11 a. The receiving cup 11a is formed at a predetermined interval on the same straight line along the axial direction (sliding direction) at a portion near the opening 111. As will be described later, the pair of engagement holes 113a and 113b are used until the forward movement of the receiving cup 11a and the bumper reinforcement 1 is completed, that is, the insertion amount of the sliding cup 11b into the receiving cup 11a is reduced. It is closed by the side wall (outer peripheral surface) 122 (see FIG. 5) of the cylindrical cup-shaped sliding cup 11b until the space becomes minimum and the volume of the space 11c becomes maximum.

  As shown in FIGS. 3 and 5, a pair of U-shaped pair of U-shaped planes for forming a pair of engagement pieces 123 a and 123 b is formed on a side wall (outer peripheral surface) 122 of the cylindrical cup-shaped sliding cup 11 b. Engagement piece cut lines 125a and 125b are cut in portions of the slide cup 11b near the opening 121 over the entire thickness. The pair of engagement piece cut lines 125a and 125b are arranged at predetermined intervals on the same straight line along the axial direction (sliding direction).

  As shown in FIG. 5, a U-shaped engagement piece cut line 125 a provided on the opening 121 side of the sliding cup 11 b is open to the opening 121 side. On the other hand, a U-shaped engagement piece cut line 125b provided on the bottom 126 side of the sliding cup 11b is open to the bottom 126 side. Accordingly, the pair of engagement piece cut lines 125a and 125b are opened in directions opposite to each other along the axial direction (sliding direction). It should be noted that the U-shaped engagement piece cut line 125a in a plan view is opened to the bottom 126 side, and the U-shaped engagement piece cut line 125b in a plan view is opened to the opening 121 side. The cut may be made over the entire thickness.

  As will be described later, the pair of engagement piece cut lines 125a and 125b are inserted when the receiving cup 11a and the bumper reinforcement 1 have been moved forward, that is, when the sliding cup 11b is inserted into the receiving cup 11a. When the volume is minimized and the volume of the space 11c is maximized, it is formed at each position facing the pair of engagement holes 113a and 113b of the receiving cup 11a (see FIG. 7). The pair of engagement piece cut lines 125a and 125b are slightly smaller than the pair of engagement holes 113a and 113b opposed to each other when the receiving cup 11a and the bumper reinforcement 1 have been moved forward. It is formed in a small shape.

  As a result, as described later, when the forward movement of the receiving cup 11a and the bumper reinforcement 1 is completed, a pair of engagement pieces 123a and 123b having a rectangular shape in a plan view whose both side edges are parallel to the axial direction are formed. A pair of engaging holes 113a that bend outwardly around one edge portion on the axial direction (sliding direction) and protrude in opposite directions along the axial direction (sliding direction) to face each other. , 113b (see FIG. 7). That is, the engaging piece 123a of the sliding cup 11b projects outward toward the bottom 126, and is pushed into the engaging hole 113a of the receiving cup 11a (see FIG. 7). The engaging piece 123b of the sliding cup 11b protrudes outward toward the opening 121, and is pushed into the engaging hole 113b of the receiving cup 11a (see FIG. 7).

  As shown in FIGS. 3 and 5, an inflator 12 as a fluid supply means is fixed to the inner surface of the bottom 126 of the sliding cup 11b. The inflator 12 is a known inflator similar to an inflator used in an occupant protection airbag device, and is configured to be ignited immediately before a vehicle collision to generate a gas 12a (corresponding to the fluid of the present invention). . Therefore, when the inflator 12 generates the gas 12a, the receiving cup 11a slides forward with respect to the sliding cup 11b as shown by an arrow 131 in FIG. 6, and moves the bumper reinforcement 1 forward.

  As shown in FIG. 3, the expansion body 11 is housed in a cylindrical container 14. The opening 141 of the container 14 opens the expansion direction of the expansion body 11, that is, the direction in which the receiving cup 11 a moves with the generation of the gas 12 a of the inflator 12 so as not to prevent the expansion body 11 from expanding. The opening 141 of the container 14 is formed with a flange portion 14a over the entire circumference. On the other hand, a top member 21 is fixed to the front end of the front member 2L so as to cover the opening of the front member 2L except for the center. The flange 14a of the container 14 is joined to the periphery of the opening of the top member 21 by welding, bonding, or the like. Therefore, the container 14 is held in the front member 2L, and the sliding cup 11b is fixed to the front member 2L via the container 14.

  Since the inflatable body 11 is housed in the container 14 as described above, the inflator 11 and the inflator 12 can be sub-assembled by the container 14. Therefore, the handleability as a part can be improved, and the workability of assembling to a vehicle body can be improved. In addition, when the inflator 12 generates gas, the container 14 receives the reaction force at the bottom via the sliding cup 11b. The reaction force received at the bottom is transmitted to the front member 2L via the flange 14a. Therefore, the reliability of fixing can be improved as compared with the case where the above-mentioned reaction force is received by using fixing means such as bolts.

  As shown in FIG. 3, the flange portion 14 a of the container 14 and the bumper reinforcement 1 are connected by an elastic member 15. The elastic member 15 is a bottomed cylindrical body made of a thin metal plate, and is folded halfway so that one side surface and one side surface face each other. The bottom 15b and the end 15c of the elastic member (cylindrical body) 15 are located on the same side with respect to the turnback position 15a. The bottom 15b of the elastic member 15 is fixed between the bumper reinforcement 1 and the receiving cup 11a, and the end 15c is fixed to the front side of the flange 14a. The folding position 15 a of the elastic member 15 is disposed along the inner wall of the container 14. As shown in FIG. 6, when the bumper reinforcement 1 moves forward, the bottom 15 b of the elastic member 15 also moves forward, so that the folding position 15 a of the elastic member 15 moves forward and the front-back direction of the elastic member 15. Increase the dimensions. That is, the opposing area between one side surface of the elastic member 15 and one side surface is reduced.

  As described above, when the expansion body 11 changes between the contracted state and the expanded state, the expandable member 15 expands and contracts as the folding position 15a moves. Therefore, the occupied space of the elastic member 15 can be smaller than in the case where the elastic member 15 has a bellows structure. Therefore, the expansion body 11 can be enlarged in the container 14. In other words, the outer shape of the shock absorbing unit 10 can be reduced, and the size can be reduced.

  The combination of the container 14 and the elastic member 15 constitutes the cover 13 of the present invention. Therefore, when the inflatable body 11 expands and when the inflatable body 11 contracts due to a collision load, the elastic member 15 of the cover body 13 is synchronously deformed. Therefore, the amount of energy absorption when the expandable body 11 contracts under the impact load can be increased.

  Next, a case where the inflator 12 generates the gas 12a will be described with reference to FIGS. FIG. 6 shows a state in which the inflator 12 generates gas 12a, the receiving cup 11a forming the inflatable body 11 slides forward, and the bumper reinforcement 1 moves forward. FIG. 7 shows a state in which the movement of the receiving cup 11a and the bumper reinforcement 1 has been completed.

  As shown in FIG. 6, with the movement of the bumper reinforcement 1, the folding position 15a of the elastic member 15 also moves forward. As described above, the bumper reinforcement 1, that is, the bumper moves forward, and is ready for a collision. Note that the state in which the movement of the receiving cup 11a and the bumper reinforcement 1 is completed is described in the present invention as “the amount of the collision load receiving member in which the insertion amount of the sliding cup into the receiving cup is minimized and the volume of the space is maximized. The maximum movement position of the

  Then, as shown in FIG. 6, the inflator 12 generates gas 12a, the receiving cup 11a slides forward, and the engaging hole 113a of the receiving cup 11a faces the engaging piece 123b of the sliding cup 11b. I do. Therefore, the engagement piece 123b is bent outward toward the opening 121 side, that is, toward the front side (to the left in FIG. 6) by the internal pressure of the gas 12a generated by the inflator 12. . However, the engaging piece 123b is pushed inward again by the side wall 112 of the receiving cup 11a that slides immediately forward.

  Subsequently, as shown in FIG. 7, when the forward movement of the receiving cup 11a and the bumper reinforcement 1 is completed, that is, the insertion amount of the sliding cup 11b into the receiving cup 11a is minimized, and the space 11c When the volume is maximized, the engaging hole 113a of the receiving cup 11a faces the engaging piece 123a of the sliding cup 11b, and the engaging hole 113b of the receiving cup 11a is engaged with the sliding cup 11b. It faces the piece 123b. Further, the folded position 15b of the elastic member 15 moves forward to reach the opening 141 of the container 14, and the elastic member 15 is deformed into a cylindrical shape having the bottom 15b, and the extension to the front ends.

  As a result, as shown in the upper part of FIGS. 7 and 8, the pair of engaging pieces 123 a and 123 b having a rectangular shape in a plan view are moved in the axial direction (sliding direction) by the internal pressure of the gas 12 a generated by the inflator 12. Are bent outward around one side edge, project in opposite directions along the axial direction (sliding direction), and are pushed into a pair of opposed engaging holes 113a and 113b, respectively.

  More specifically, the engaging piece 123a of the sliding cup 11b is bent outwardly toward the bottom 126 side, that is, toward the rear side (to the right in FIG. 7), and protrudes to receive. It is pushed into the engagement hole 113a of the cup 11a. Further, the engagement piece 123b of the sliding cup 11b is bent outwardly toward the opening 121 side, that is, toward the front side (to the left in FIG. 7), and protrudes, so that the receiving cup 11a is formed. Into the engaging hole 113b.

  Accordingly, as shown in the upper part of FIGS. 7 and 8, the pair of engaging pieces 123a and 123b are bent outward and pushed into the pair of opposing engaging holes 113a and 113b, respectively. A pair of internal pressure release holes 127a and 127b communicating with the pair of engagement holes 113a and 113b are formed in the side wall 122 of the dynamic cup 11b. As a result, the gas 12a in the space 11c generated by the inflator 12 flows out of the expansion body 11 through the pair of internal pressure release holes 127a and 127b and the pair of engagement holes 113a and 113b, and is discharged. Then, the forward movement of the receiving cup 11a stops.

  As shown in the lower part of FIG. 8, the pair of engagement pieces 123a and 123b are bent outward and pushed into the pair of engagement holes 113a and 113b by the internal pressure of the gas 12a in the space 11c. Thereafter, the receiving cup 11a moves slightly forward. As a result, the side edge portion of the engagement hole 113a on the opening 111 side collides with the engagement piece 123a and engages, so that the forward movement of the receiving cup 11a can be reliably stopped. That is, the forward movement of the bumper reinforcement 1 can be reliably stopped.

  Thereafter, as shown in FIG. 9, when the collision object collides with the bumper, the bumper and the bumper reinforcement 1 are pushed backward, that is, pushed in the direction of the arrow 132. Therefore, the receiving cup 11a forming the expansion body 11 is slid backward. At this time, the gas 12a remaining in the space 11c between the receiving cup 11a and the sliding cup 11b passes through the pair of internal pressure release holes 127a and 127b and the pair of engagement holes 113a and 113b, and the expanded body 11a. Is discharged to the outside and discharged.

  When the receiving cup 11a moves slightly backward, the front side edge of the engaging hole 113b, that is, the bottom side edge of the receiving cup 11a collides with and engages with the engaging piece 123b. Therefore, the rearward movement of the engagement hole 113b of the receiving cup 11a is stopped. Further, the engagement piece 123a pushed into the engagement hole 113a of the receiving cup 11a is again pushed inward of the sliding cup 11b by the side wall 112 of the receiving cup 11a sliding backward.

  As a result, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a is pushed rearward (in the direction of the arrow 132) by the bumper reinforcement 1, so that it receives a collision load and bellows along the inner wall of the container 14. Buckling deformation. Therefore, as shown in FIG. 10, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a receives a collision load and buckles and deforms along the inner wall of the container 14 to be contracted in a bellows-like manner. The backward movement of the cup 11a and the bumper reinforcement 1 is completed. Thereby, while the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a contracts in a bellows-like manner, the collision energy is absorbed and the shock accompanying the collision is reduced.

  At the same time, as shown in FIGS. 9 and 10, the elastic member 15 is also pushed rearward (in the direction of arrow 132) by the bumper reinforcement 1, so that the folding position 15a is moved along the inner wall of the container 14 under the impact load. The rearward movement of the receiving cup 11a and the bumper reinforcement 1 completes. Therefore, the collision energy is also absorbed by the contraction of the elastic member 15, and the energy absorption is increased together with the amount of the bellows-like buckling deformation of the side wall 112 of the receiving cup 11a.

  As described above, in the shock absorbing unit 10 according to the first embodiment, when the forward movement of the receiving cup 11a and the bumper reinforcement 1 is completed, the pair of engagement pieces 123a and 123b are bent outward. Then, they are pushed into a pair of opposed engagement holes 113a and 113b, respectively, to form a pair of internal pressure release holes 127a and 127b. As a result, the gas 12a in the space 11c generated by the inflator 12 flows out of the expansion body 11 through the pair of internal pressure release holes 127a and 127b and the pair of engagement holes 113a and 113b to be discharged and received. The forward movement of the cup 11a can be stopped. Further, the side edge of the engaging hole 113a on the opening 111 side collides with and engages with the engaging piece 123a, so that the forward movement of the receiving cup 11a and the bumper reinforcement 1 can be reliably stopped. .

  Thereafter, when the receiving cup 11a moves rearward due to the collision load, the front side edge of the engaging hole 113b collides with the engaging piece 123b and engages. As a result, the side wall 112 on the front side with respect to the engagement hole 113b of the receiving cup 11a is buckled and shrunk in the form of a bellows along the inner wall of the container 14 under the impact load, and contracts rearward of the bumper reinforcement 1. Is completed. Thereby, the bumper and the bumper reinforcement 1 are made to protrude in the collision direction immediately before the collision, and a mechanism for absorbing the collision energy is provided by a pair of engagement holes 113a, 113b of the receiving cup 11a and a pair of engagement of the sliding cup 11b. A simple structure including the pieces 123a and 123b and the inflator 12 can be used, and the structure can be reduced.

  Further, with the rearward movement of the bumper reinforcement 1, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a contracts in a bellows shape, so that the collision energy is absorbed and the impact accompanying the collision is absorbed. Can be relaxed. Further, with the backward movement of the bumper reinforcement 1, the folding position 15a of the elastic member 15 moves rearward along the inner wall of the container 14, so that the elastic member 15 is also contracted, and the collision energy is absorbed. Therefore, the amount of energy absorption can be increased. Here, the pair of engaging holes 113a and 113b of the receiving cup 11a and the pair of engaging pieces 123a and 123b of the sliding cup 11b function as an example of the engaging means.

[Second embodiment]
Next, the configuration of the shock absorbing unit 31 and the like according to the second embodiment will be described with reference to FIGS. The same reference numerals as those of the shock absorbing unit 10 according to the first embodiment shown in FIGS. 1 to 10 denote the same or corresponding parts as those of the shock absorbing unit 10 according to the first embodiment. It is.

  The configuration of the shock absorbing unit 31 and the like according to the second embodiment is substantially the same as the configuration of the shock absorbing unit 10 and the like according to the first embodiment. The control configuration and control processing of the shock absorbing unit 31 according to the second embodiment are substantially the same as the control configuration and control processing of the shock absorbing unit 10 according to the first embodiment. However, the shock absorbing unit 31 according to the second embodiment is different in that a “sliding cup 32” shown in FIG. 11 is provided instead of the “sliding cup 11b” of the expansion body 11. In other respects, the second embodiment is the same as the first embodiment, and a description of the same portions will not be repeated.

  The configuration of the sliding cup 32 will be described with reference to FIG. FIG. 11 corresponds to FIG. As shown in FIG. 11, on the side wall (outer peripheral surface) 122 of the cylindrical cup-shaped sliding cup 32, similarly to the above-mentioned sliding cup 11b, a pair of engaging pieces 123a, 123b for forming a pair of engaging pieces 123a, 123b is formed. A pair of cut lines 125a and 125b for the engagement pieces are cut over the entire thickness in portions of the slide cup 11b near the opening 121, respectively. The pair of engagement piece cut lines 125a and 125b are arranged at predetermined intervals on the same straight line along the axial direction (sliding direction).

  However, of the pair of engaging pieces 123a and 123b, the engaging piece 123b that protrudes outward toward the opening 121 side and is pushed into the engaging hole 113b of the receiving cup 11a is a radially outer surface of the tip portion. In addition, a protruding portion 151 protruding outward from the outer peripheral surface of the side wall 122 by a predetermined height (for example, a height of 10 mm) is formed. The protruding portion 151 is formed over the entire circumferential width of the engagement piece 123b. The tip side is the same height as the outer peripheral surface of the side wall 122, gradually increases toward the rear side, and gradually decreases toward the side wall. 122 is formed in a substantially triangular shape in a side view at the same height as the outer peripheral surface. Note that the protrusion 151 is not limited to a substantially triangular shape in a side view, and may be formed in an arc shape in a side view, a substantially semicircular shape in a side view, or the like.

  Therefore, as shown in FIG. 12, when the sliding cup 32 is slidably inserted into the receiving cup 11a, the projecting portion 151 of the engagement piece 123b has The engagement piece 123b has a distal end slightly bent inward of the slide cup 32 so as to slidably contact the inner surface of the side wall 112. When the inflator 12 generates gas 12a and the receiving cup 11a slides forward and the engaging hole 113a of the receiving cup 11a faces the engaging piece 123b of the sliding cup 32, The piece 123b is bent outward by the internal pressure of the gas 12a generated by the inflator 12. However, the engaging piece 123b is pushed inward again by the side wall 112 of the receiving cup 11a that slides immediately forward.

  Next, when the forward movement of the receiving cup 11a and the bumper reinforcement 1 is completed, that is, when the insertion amount of the sliding cup 11b into the receiving cup 11a is minimized and the volume of the space 11c is maximized. Will be described with reference to FIG. FIG. 13 corresponds to FIG. As shown in the upper part of FIG. 13, the engaging hole 113a of the receiving cup 11a faces the engaging piece 123a of the sliding cup 11b, and the engaging hole 113b of the receiving cup 11a is engaged with the sliding cup 11b. It faces the piece 123b.

  As a result, as shown in the upper part of FIG. 13, a pair of engagement pieces 123 a and 123 b having a rectangular shape in a plan view are moved by the internal pressure of the gas 12 a generated by the inflator 12 on one side in the axial direction (sliding direction). It is bent outward around the edge, protrudes in opposite directions along the axial direction (sliding direction), and is pushed into a pair of engaging holes 113a and 113b facing each other.

  Thereby, as shown in the upper part of FIG. 13, the pair of engaging pieces 123a and 123b are bent outward and pushed into the pair of opposing engaging holes 113a and 113b, respectively. A pair of internal pressure release holes 127a, 127b communicating with the pair of engagement holes 113a, 113b is formed in the side wall 122 of the second member. As a result, the gas 12a in the space 11c generated by the inflator 12 flows out of the expansion body 11 through the pair of internal pressure release holes 127a and 127b and the pair of engagement holes 113a and 113b, and is discharged. Then, the forward movement of the receiving cup 11a stops.

  As shown in the lower part of FIG. 13, the pair of engaging pieces 123a and 123b are bent outward and pushed into the pair of engaging holes 113a and 113b by the internal pressure of the gas 12a in the space 11c. Thereafter, the receiving cup 11a moves slightly forward. As a result, the side edge portion of the engagement hole 113a on the opening 111 side collides with the engagement piece 123a and engages, so that the forward movement of the receiving cup 11a can be reliably stopped. That is, the forward movement of the bumper reinforcement 1 can be reliably stopped.

  Thereafter, as shown in the upper part of FIG. 14, when the collision object collides with the bumper, the bumper and the bumper reinforcement 1 are pushed backward. Therefore, the receiving cup 11 a forming the inflatable body 11 is slid backward, that is, in the direction of the arrow 133. When the receiving cup 11a moves slightly backward, the front side edge of the engaging hole 113b, that is, the bottom side edge of the receiving cup 11a collides with and engages with the engaging piece 123b. Therefore, the rearward movement of the engagement hole 113b of the receiving cup 11a is stopped. Further, the engagement piece 123a pushed into the engagement hole 113a of the receiving cup 11a is again pushed inward of the sliding cup 11b by the side wall 112 of the receiving cup 11a sliding backward.

  As a result, as shown in the lower part of FIG. 14, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a is pushed rearward (in the direction of the arrow 133) by the bumper reinforcement 1 to push the engagement piece 123b. Further, it is bent rearward in a substantially U-shape in a side view, and buckled and deformed along the inner wall of the container 14. At this time, since the protrusion 151 of the engagement piece 123b bent in a substantially U-shape in side view comes into contact with the side wall 122 of the slide cup 32, the upper end of the engagement piece 123b is larger than the engagement hole 113b. Protrude outward.

  Thereby, even if the engaging piece 123b is bent rearward in a substantially U-shape when viewed from the side, the front side edge of the engaging hole 113b, that is, the side edge on the bottom side of the receiving cup 11a is engaged. The state of collision and engagement with the piece 123b can be reliably maintained. As a result, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a is pushed rearward (in the direction of the arrow 132) by the bumper reinforcement 1, and receives a collision load to accord along the inner wall of the container 14. Buckling deformation. Accordingly, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a receives a collision load and buckles along the inner wall of the container 14 and contracts in a bellows-like manner, and the receiving cup 11a and the bumper reinforcement 1 Is completed (see FIG. 10).

  As described in detail above, in the shock absorbing unit 31 according to the second embodiment, in addition to the effects achieved by the shock absorbing unit 10 according to the first embodiment, the engaging piece 123b of the sliding cup 32 is rearward viewed from the side. Even if it is bent in a substantially U-shape, the engagement between the front side edge of the engagement hole 113b and the engagement piece 123b can be maintained. Thereby, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a contracts in a bellows shape, so that the collision energy is absorbed, and the impact accompanying the collision can be reliably reduced.

[Third embodiment]
Next, the configuration of the shock absorbing unit 41 and the like according to the third embodiment will be described with reference to FIGS. The same reference numerals as those in the configuration of the shock absorbing unit 10 according to the first embodiment shown in FIGS. 1 to 10 denote the same or corresponding parts as those of the configuration of the shock absorbing unit 10 according to the first embodiment. It is.

  The configuration of the shock absorbing unit 41 and the like according to the third embodiment is substantially the same as the configuration of the shock absorbing unit 10 and the like according to the first embodiment. Further, the control configuration and control processing of the shock absorbing unit 41 according to the third embodiment are substantially the same as the control configuration and control processing of the shock absorbing unit 10 according to the first embodiment. However, the impact absorbing unit 41 according to the third embodiment is different in that an “expanding body 42” shown in FIG. In other respects, the third embodiment is the same as the first embodiment, and a description of the same portions will not be repeated.

  The configuration of the expansion body 42 will be described with reference to FIGS. As shown in FIG. 15, the configuration of the expansion body 42 is substantially the same as the configuration of the expansion body 11. However, the difference is that a receiving cup 43 is used instead of the receiving cup 11a. Further, the difference is that an exhaust valve 48 as exhaust means is fixed to the inner surface of the bottom 126 of the sliding cup 11b in addition to the inflator 12.

  As shown in FIGS. 15 and 16, the side wall (outer peripheral surface) 112 of the cylindrical receiving cup 43 opens inward instead of the pair of engaging holes 113 a and 113 b according to the first embodiment. A pair of engaging recesses 45a and 45b bulging outwardly in a substantially box shape are formed. The pair of engaging concave portions 45a and 45b are formed at predetermined intervals on the same straight line along the axial direction (sliding direction) in a portion near the opening 111 of the receiving cup 43. Specifically, the pair of engaging recesses 45a and 45b are formed to have a predetermined height outward from the peripheral edge of each of the rectangular opening portions 46a and 46b whose both side edges are parallel to the axial direction. It is formed in an approximately box-shaped rectangular shape as viewed from above. Each of the openings 46a, 46b is formed in a rectangular shape in plan view having substantially the same shape as the pair of engagement holes 113a, 113b according to the first embodiment.

  The openings 46a and 46b of the pair of engagement recesses 45a and 45b are used to move the receiving cup 43 and the bumper reinforcement 1 forward, that is, slide into the receiving cup 43, as described later. The moving cup 11b is closed by the side wall (outer peripheral surface) 122 (see FIG. 17) of the cylindrical container-shaped sliding cup 11b until the insertion amount of the moving cup 11b becomes minimum and the volume of the space 11c becomes maximum.

  As shown in FIG. 15, in addition to the inflator 12, the exhaust valve 48 (discharge valve described in the specification of Japanese Patent Application No. 2017-129133) is provided on the inner surface of the bottom 126 of the sliding cup 11b. ) Are fixed.) The exhaust valve 48 is configured to open to the atmosphere when the internal pressure of the gas 12a generated by the inflator 12 in the space 11c of the expansion body 42 becomes equal to or higher than a predetermined pressure.

  Specifically, the exhaust valve 48 is a hollow box body, and a through hole 48b is formed on a surface of the sliding cup 11b that contacts the inner surface of the bottom 126, and a fragile portion is formed on the opposite surface. 48a are formed. The weak portion 48a is configured to be broken when the internal pressure in the space 11c of the expansion body 42 becomes equal to or higher than a predetermined pressure. Also, through holes 126a and 14b are formed in the bottom 126 of the sliding cup 11b and the bottom of the container 14 so as to face the through hole 48b of the exhaust valve 48. Thus, when the fragile portion 48a is broken, the gas 12a in the space 11c of the expansion body 42 is discharged to the outside via these through holes 48b, 126a, 14b, and is released to the atmosphere.

  Next, the case where the inflator 12 generates the gas 12a will be described with reference to FIGS. FIG. 17 shows a state in which the inflator 12 generates the gas 12a, the receiving cup 43 forming the inflatable body 42 slides forward, and the bumper reinforcement 1 moves forward. FIG. 18 shows a state in which the movement of the receiving cup 43 and the bumper reinforcement 1 has been completed.

  As shown in FIG. 17, with the movement of the bumper reinforcement 1, the turn-back position 15a of the elastic member 15 also moves forward. As described above, the bumper reinforcement 1, that is, the bumper moves forward, and is ready for a collision. The state in which the movement of the receiving cup 43 and the bumper reinforcement 1 is completed is referred to as “the collision load receiving member in which the insertion amount of the sliding cup into the receiving cup is minimum and the volume of the space is maximum” in the present invention. The maximum movement position of the

  Then, as shown in FIG. 17, the inflator 12 generates gas 12a, the receiving cup 43 slides forward, and the engaging concave portion 45a of the receiving cup 43 faces the engaging piece 123b of the sliding cup 11b. I do. Therefore, the engagement piece 123b is bent outward toward the opening 121 side, that is, toward the front side (to the left in FIG. 17) by the internal pressure of the gas 12a generated by the inflator 12. . However, the engagement piece 123b is pushed inward again by the side wall 112 of the receiving cup 43 that slides immediately forward.

  Subsequently, as shown in FIG. 18, when the forward movement of the receiving cup 43 and the bumper reinforcement 1 is completed, that is, the insertion amount of the sliding cup 11 b into the receiving cup 43 becomes minimum, and the space 11 c When the volume is maximized, the engaging recess 45a of the receiving cup 43 faces the engaging piece 123a of the sliding cup 11b, and the engaging hole recess 45b of the receiving cup 43 is It faces the engaging piece 123b. Further, the folded position 15b of the elastic member 15 moves forward to reach the opening 141 of the container 14, and the elastic member 15 is deformed into a cylindrical shape having the bottom 15b, and the extension to the front ends.

  As a result, as shown in FIG. 18, the pair of engagement pieces 123 a and 123 b having a rectangular shape in a plan view are moved by the internal pressure of the gas 12 a generated by the inflator 12 so as to have one side edge in the axial direction (sliding direction). , And protrudes in opposite directions along the axial direction (sliding direction), and is pushed into a pair of opposed engaging recesses 45a and 45b, respectively.

  More specifically, the engagement piece 123a of the sliding cup 11b is bent outwardly toward the bottom 126 side, that is, toward the rear side (to the right in FIG. 18), and protrudes from the receiving section. The cup 43 is pushed into the opening 46a of the engaging recess 45a. Further, the engagement piece 123b of the sliding cup 11b is bent outward to the opening 121 side, that is, toward the front side (to the left in FIG. 18), and protrudes. Is pressed into the opening 46b of the engaging recess 45b.

  As a result, the pair of engagements 123a and 123b are bent outward by the internal pressure of the gas 12a in the space 11c of the inflatable body 42, and into the openings 46a and 46b of the pair of engagement recesses 45a and 45b. After being pushed in, the receiving cup 43 moves slightly forward. As a result, the side edge of the engaging recess 45a on the opening 111 side collides with and engages with the engaging piece 123a, so that the front movement of the receiving cup 43 can be stopped. That is, the forward movement of the bumper reinforcement 1 can be stopped.

  Further, since the forward movement of the receiving cup 43 is stopped, the internal pressure in the space 11c of the expansion body 42 becomes equal to or higher than a predetermined pressure, and the fragile portion 48a of the exhaust valve 48 is broken. As a result, the broken weak portion 48a of the exhaust valve 48, the through hole 48b of the exhaust valve 48, the through hole 126a formed in the bottom 126 of the sliding cup 11b, and the through hole 14b formed in the bottom of the container 14 are removed. Through this, the gas 12a in the space 11c of the expansion body 42 is exhausted to the outside, and is opened to the atmosphere. Thereby, the forward movement of the receiving cup 43 can be reliably stopped. That is, the forward movement of the bumper reinforcement 1 can be reliably stopped.

  Thereafter, as shown in FIG. 19, when the collision object collides with the bumper, the bumper and the bumper reinforcement 1 are pushed backward, that is, pushed in the arrow 136 direction. Therefore, the receiving cup 43 forming the expansion body 42 is slid rearward. At this time, the gas 12a remaining in the space 11c between the receiving cup 43 and the sliding cup 11b is formed in the broken weak portion 48a, the through hole 48b of the exhaust valve 48, and the bottom 126 of the sliding cup 11b. The gas is discharged to the outside through the formed through hole 126a and the through hole 14b formed in the bottom of the container 14.

  When the receiving cup 43 slightly moves rearward, the front side edge of the engaging recess 45b, that is, the bottom side edge of the receiving cup 43 collides with the engaging piece 123b and engages. Therefore, the backward movement of the engagement recess 45b of the receiving cup 43 is stopped. Further, the engaging piece 123a pushed into the engaging concave portion 45a of the receiving cup 43 is pushed again into the sliding cup 11b by the side wall 112 of the receiving cup 43 sliding backward.

  As a result, the side wall 112 on the front side with respect to the engagement concave portion 45b of the receiving cup 43 is pushed rearward (in the direction of the arrow 136) by the bumper reinforcement 1, so that it receives a collision load and bellows along the inner wall of the container 14. Buckling deformation. Accordingly, as shown in FIG. 20, the side wall 112 on the front side of the engagement concave portion 45b of the receiving cup 43 receives the collision load and buckles along the inner wall of the container 14 and contracts in a bellows-like manner. The backward movement of the cup 43 and the bumper reinforcement 1 is completed. Thereby, while the side wall 112 on the front side of the engagement concave portion 45b of the receiving cup 43 contracts in a bellows-like manner, the collision energy is absorbed and the impact accompanying the collision is reduced.

  At the same time, as shown in FIGS. 19 and 20, the elastic member 15 is also pushed backward (in the direction of the arrow 136) by the bumper reinforcement 1, so that the folding position 15a is moved along the inner wall of the container 14 under the impact load. The rearward movement of the receiving cup 43 and the bumper reinforcement 1 completes. Therefore, the collision energy is also absorbed by the contraction of the elastic member 15, and the energy absorption amount is increased together with the amount of the bellows-like buckling deformation of the side wall 112 of the receiving cup 43.

  As described above, in the shock absorbing unit 41 according to the third embodiment, when the forward movement of the receiving cup 43 and the bumper reinforcement 1 is completed, the pair of engagement pieces 123a and 123b are bent outward. And pushed into the pair of engaging recesses 45a and 45b facing each other. Then, since the side edge of the engaging recess 45a on the opening 111 side collides with the engaging piece 123a and engages with the engaging piece 123a, the forward movement of the receiving cup 43 can be stopped.

  Further, the internal pressure in the space 11c of the expansion body 42 becomes equal to or higher than a predetermined pressure, and the fragile portion 48a of the exhaust valve 48 is broken. As a result, the space 11c of the inflatable body 42 passes through the broken portion 48a of the exhaust valve 48, the through hole 48b, the bottom 126 of the sliding cup 11b, and the through holes 126a and 14b formed in the bottom of the container 14. The internal gas 12a is exhausted to the outside, and is released to the atmosphere. Thus, the forward movement of the receiving cup 43 and the bumper reinforcement 1 can be reliably stopped.

  Thereafter, when the receiving cup 43 moves rearward due to the collision load, the front side edge of the engaging recess 45b collides with the engaging piece 123b and engages with it. As a result, the side wall 112 on the front side with respect to the engagement concave portion 45b of the receiving cup 43 receives the collision load and buckles and deforms in a bellows shape along the inner wall of the container 14 so that the side wall 112 contracts rearward of the bumper reinforcement 1. Is completed. Thereby, the bumper and the bumper reinforcement 1 are made to protrude in the collision direction immediately before the collision, and a mechanism for absorbing the collision energy is provided by a pair of engagement recesses 45a and 45b of the receiving cup 43 and a pair of engagement of the sliding cup 11b. A simple structure including the pieces 123a and 123b, the inflator 12, and the exhaust valve 48 can be used, and a low-cost structure can be achieved.

  Further, with the rearward movement of the bumper reinforcement 1, the side wall 112 on the front side of the engagement recess 45b of the receiving cup 43 contracts in a bellows-like manner, so that the collision energy is absorbed and the impact accompanying the collision is absorbed. Can be relaxed. Further, with the backward movement of the bumper reinforcement 1, the folding position 15a of the elastic member 15 moves rearward along the inner wall of the container 14, so that the elastic member 15 is also contracted, and the collision energy is absorbed. Therefore, the amount of energy absorption can be increased. Here, the pair of engaging recesses 45a and 45b of the receiving cup 43 and the pair of engaging pieces 123a and 123b of the sliding cup 11b function as an example of the engaging means.

[Fourth embodiment]
Next, the configuration of the shock absorbing unit 51 and the like according to the fourth embodiment will be described with reference to FIGS. The same reference numerals as those in the configuration of the shock absorbing unit 10 according to the first embodiment shown in FIGS. 1 to 10 denote the same or corresponding parts as those of the configuration of the shock absorbing unit 10 according to the first embodiment. It is.

  The configuration of the shock absorbing unit 51 and the like according to the fourth embodiment is substantially the same as the configuration of the shock absorbing unit 10 and the like according to the first embodiment. The control configuration and control processing of the shock absorbing unit 51 according to the fourth embodiment are almost the same as the control configuration and control processing of the shock absorbing unit 10 according to the first embodiment. However, the shock absorbing unit 51 according to the fourth embodiment is different in that an “expanding body 52” shown in FIG. In other respects, the fourth embodiment is the same as the first embodiment, and a description of the same portions will not be repeated.

  The configuration of the expansion body 52 will be described with reference to FIGS. As shown in FIG. 21, the configuration of the expansion body 52 is substantially the same as the configuration of the expansion body 11. However, the difference is that a cylindrical container-shaped receiving cup 53 is used instead of the receiving cup 11a and a cylindrical container-shaped sliding cup 55 is used instead of the sliding cup 11b. Further, the difference is that, in addition to the inflator 12, the exhaust valve 48 according to the third embodiment as a discharging means is fixed to the inner surface of the bottom 126 of the sliding cup 55.

  As shown in FIGS. 21 and 22, the side wall (outer peripheral surface) 112 of the cylindrical container-shaped receiving cup 53 opens inward instead of the pair of engaging holes 113a and 113b according to the first embodiment. A vertically long rectangular engagement recess 53 a, which extends in the axial direction (sliding direction) and bulges outward, is formed near the opening 111 of the receiving cup 53. This vertically long engaging concave portion 53a has a substantially rectangular shape in plan view that bulges outward by a predetermined height over the entire circumference from the peripheral portion of the vertically long rectangular opening portion 53b whose both side edges are parallel to the axial direction. It is formed in a box shape. The circumferential width of the vertically elongated opening 53b is formed to be substantially the same as the circumferential width of the pair of engagement holes 113a and 113b according to the first embodiment.

  The length of the longitudinal opening 53b in the axial direction (sliding direction) is determined by the moving distance of the bumper reinforcement 1 in the front-rear direction until the insertion amount of the sliding cup 55 into the receiving cup 53 is reduced from the maximum to the minimum. Is formed to have a length substantially equal to. Furthermore, the vertical opening 53b is closed by the side wall (outer peripheral surface) 161 (see FIG. 23) of the sliding cup 55 until the amount of insertion of the sliding cup 55 into the receiving cup 53 is minimized (see FIG. 25). ). The length of the vertical opening 53b in the axial direction (sliding direction) is determined by the distance of movement of the bumper reinforcement 1 in the front-rear direction until the insertion amount of the sliding cup 55 into the receiving cup 53 is reduced from the maximum to the minimum. It may be formed in the above length.

  Further, the vertically long engaging concave portion 53a is provided at the end on the opening 111 side, that is, the end opposite to the bumper reinforcement 1, in a direction orthogonal to the axial direction (sliding direction), that is, in the circumferential direction. A step portion 53c having a substantially U-shaped cross section is formed so as to protrude inward over the entire width by a predetermined height. A locking groove 53d having a substantially U-shaped cross section is formed by the step portion 53c and the side edge of the vertically long engaging concave portion 53a on the opening 111 side over the entire circumferential width. As shown in FIG. 22, the vertically long engagement recess 53 a in a vertically long rectangular shape in plan view is formed by laser welding, bonding, or the like in a notch groove in a vertically long rectangular shape in plan view formed at the end of the receiving cup 53 on the opening 111 side. May be joined together.

  As shown in FIGS. 21 and 23, the cylindrical cup-shaped sliding cup 55 has a side wall 161 slightly longer than the side wall 122 of the sliding cup 11b according to the first embodiment. When the insertion amount of the slide cup 55 into the receiving cup 53 is maximized, the side wall 161 of the slide cup 55 has a side edge opposite to the opening 111 of the vertically long engagement recess 53 a, that is, At the position facing the side edge of the bumper reinforcement 1, there is provided an engaging projection 55 a swelling outward at a predetermined height in a substantially U-shaped cross section along the circumferential direction. The circumferential length of the engaging projection 55a is formed to be equal to the circumferential width of the pair of engaging pieces 123a and 123b according to the first embodiment. The cross-sectional shape of the engaging projection 55a is substantially U-shaped in cross-section, which is substantially the same as the cross-sectional shape of the locking groove 53d of the receiving cup 53.

  Therefore, as shown in FIG. 21, the sliding cup 55 is slidably inserted into the receiving cup 11a with the engaging projection 55a fitted into the vertically long engaging recess 53a of the receiving cup 53. One space 11c is formed between the two. When the insertion amount of the sliding cup 55 into the receiving cup 53 is maximized, the engaging projection 55a is located near the side edge of the vertically long engaging recess 53a on the bumper reinforcement 1 side. Or is in contact with the side edge on the bumper reinforcement 1 side. Then, as described later, when the insertion amount of the sliding cup 55 into the receiving cup 53 is minimized, the engaging projection 55a is configured to be fitted into the locking groove 53d ( See FIG. 25).

  As shown in FIGS. 21 and 23, in addition to the inflator 12, an exhaust valve 48 according to a third embodiment as a discharging unit is fixed to the inner surface of the bottom 126 of the sliding cup 55. The exhaust valve 48 is a hollow box body, and a through hole 48b is formed in a surface that contacts the inner surface of the bottom portion 126 of the sliding cup 55, and a fragile portion 48a is formed in the opposite surface. I have. The weak portion 48a is configured to be broken when the internal pressure in the space 11c of the expansion body 52 becomes equal to or higher than a predetermined pressure. Further, through holes 126 a and 14 b are formed in the bottom 126 of the sliding cup 55 and the bottom of the container 14 so as to face the through hole 48 b of the exhaust valve 48. Thus, when the fragile portion 48a is broken, the gas 12a in the space 11c of the expansion body 52 is discharged to the outside through each of the through holes 48b, 126a, and 14b, and is released to the atmosphere.

  Next, a case where the inflator 12 generates the gas 12a will be described with reference to FIGS. FIG. 24 shows a state in which the inflator 12 generates the gas 12a, the receiving cup 53 forming the inflatable body 52 slides forward, and the bumper reinforcement 1 moves forward. FIG. 25 shows a state in which the movement of the receiving cup 53 and the bumper reinforcement 1 has been completed.

  As shown in FIG. 24, with the movement of the bumper reinforcement 1, the turn-back position 15a of the elastic member 15 also moves forward. As described above, the bumper reinforcement 1, that is, the bumper moves forward, and is ready for a collision. Note that the state in which the movement of the receiving cup 53 and the bumper reinforcement 1 is completed is described in the present invention as "the collision load receiving member in which the insertion amount of the sliding cup into the receiving cup is minimized and the volume of the space is maximized." The maximum movement position of the

  As shown in FIG. 24, the inflator 12 generates the gas 12a, the receiving cup 53 slides forward, and the engaging projection 55a of the sliding cup 55 slides in the vertically long engaging recess 53a. I do. Then, after the engaging protrusion 55a of the sliding cup 55 comes into contact with the step 53c of the vertically long engaging recess 53a, the receiving cup 53 and the bumper reinforcement 1 further move forward. For this reason, as shown in FIG. 25, when the forward movement of the receiving cup 53 and the bumper reinforcement 1 is completed, that is, the insertion amount of the sliding cup 55 into the receiving cup 53 becomes minimum, and the space 11c When the capacity is maximized, the engagement protrusion 55a of the sliding cup 55 is fitted into a locking groove 53d formed at the rear end of the vertically long engagement recess 53a.

  Further, the folded position 15b of the elastic member 15 moves forward to reach the opening 141 of the container 14, and the elastic member 15 is deformed into a cylindrical shape having the bottom 15b, and the extension to the front ends. As a result, the engaging convex portion 55a of the sliding cup 55 is fitted and engaged in the locking groove 53d of the vertically long engaging concave portion 53a of the receiving cup 53, so that the forward movement of the receiving cup 53 is stopped. Can be. That is, the forward movement of the bumper reinforcement 1 can be stopped.

  Further, since the forward movement of the receiving cup 53 is stopped, the internal pressure in the space 11c of the expansion body 52 becomes equal to or higher than a predetermined pressure, and the fragile portion 48a of the exhaust valve 48 is broken. As a result, the broken weak portion 48a of the exhaust valve 48, the through hole 48b of the exhaust valve 48, the through hole 126a formed in the bottom 126 of the sliding cup 55, and the through hole 14b formed in the bottom of the container 14 are removed. Through this, the gas 12a in the space 11c of the expansion body 52 is exhausted to the outside and is released to the atmosphere. Thus, the forward movement of the receiving cup 53 can be reliably stopped. That is, the forward movement of the bumper reinforcement 1 can be reliably stopped.

  Thereafter, as shown in FIG. 26, when the collision object collides with the bumper, the bumper and the bumper reinforcement 1 are pushed backward, that is, pushed in the arrow 138 direction. Therefore, the receiving cup 53 forming the expansion body 52 is slid backward. At this time, the gas 12a remaining in the space 11c between the receiving cup 53 and the sliding cup 55 is formed in the broken weak portion 48a, the through hole 48b of the exhaust valve 48, and the bottom 126 of the sliding cup 55. The gas is discharged to the outside through the formed through hole 126a and the through hole 14b formed in the bottom of the container 14.

  In addition, since the engaging protrusion 55a of the sliding cup 55 is engaged with the locking groove 53d of the vertically engaging recess 53a of the receiving cup 53, the rearward movement of the vertically engaging recess 53a of the receiving cup 53 is performed. Is stopped. As a result, the side wall 112 on the front side of the locking groove 53d of the vertically long engagement concave portion 53a of the receiving cup 53 is pushed rearward (in the direction of the arrow 138) by the bumper reinforcement 1, and receives the collision load to cause the container 14 to receive the collision load. Buckles along the inner wall of the bellows.

  Therefore, as shown in FIG. 27, the side wall 112 on the front side of the locking groove 53d of the vertically long engaging recess 53a of the receiving cup 53 receives the collision load and buckles and deforms along the inner wall of the container 14 to be bellows. The rearward movement of the receiving cup 53 and the bumper reinforcement 1 is completed. Thereby, while the side wall 112 on the front side of the locking groove 53d of the vertically long engaging recess 53a of the receiving cup 53 contracts in a bellows-like manner, the collision energy is absorbed and the shock accompanying the collision is reduced.

  At the same time, as shown in FIGS. 26 and 27, the elastic member 15 is also pushed rearward (in the direction of the arrow 138) by the bumper reinforcement 1, so that the folding position 15a is moved along the inner wall of the container 14 by receiving the collision load. The rearward movement of the receiving cup 53 and the bumper reinforcement 1 completes. Therefore, the collision energy is absorbed by the contraction of the elastic member 15, and the energy absorption is increased in addition to the amount of the bellows-like buckling deformation of the side wall 112 of the receiving cup 53.

  As described above, in the shock absorbing unit 51 according to the fourth embodiment, when the forward movement of the receiving cup 53 and the bumper reinforcement 1 is completed, the engaging convex portion 55a of the sliding cup 55 becomes the receiving cup 55a. The step 53c of the vertically long engaging recess 53a of 53 is fitted into the locking groove 53d. As a result, the engagement convex portion 55a of the sliding cup 55 engages with the locking groove 53d of the vertically long engagement concave portion 53a of the receiving cup 53, so that the forward movement of the receiving cup 53 can be stopped.

  Further, the internal pressure in the space 11c of the expansion body 52 becomes equal to or higher than a predetermined pressure, and the fragile portion 48a of the exhaust valve 48 is broken. As a result, the space 11c of the expansion body 52 is passed through the broken portion 48a of the exhaust valve 48, the through hole 48b, the bottom 126 of the sliding cup 55, and the through holes 126a and 14b formed in the bottom of the container 14. The inside gas 12a is exhausted to the outside and is opened to the atmosphere. Thereby, the forward movement of the receiving cup 53 and the bumper reinforcement 1 can be reliably stopped.

  Thereafter, when the receiving cup 53 moves rearward due to the collision load, the engaging groove 53d of the vertically long engaging concave portion 53a is engaged with the engaging convex portion 55a of the sliding cup 55. The side wall 112 on the front side of 53d receives the collision load and is buckled and shrunk along the inner wall of the container 14 in a bellows-like manner, whereby the rearward movement of the bumper reinforcement 1 is completed. Thereby, the bumper and the bumper reinforcement 1 are made to protrude in the collision direction immediately before the collision, and the mechanism for absorbing the collision energy is provided by a vertically long engaging concave portion 53a of the receiving cup 53, an engaging convex portion 55a of the sliding cup 55, an inflator. 12, and a simple structure including the exhaust valve 48, and can be inexpensive.

  Further, with the rearward movement of the bumper reinforcement 1, the side wall 112 on the front side of the locking groove 53d of the receiving cup 53 contracts in a bellows-like manner, so that the collision energy is absorbed and the shock accompanying the collision is absorbed. Can be relaxed. Further, with the backward movement of the bumper reinforcement 1, the folding position 15a of the elastic member 15 moves rearward along the inner wall of the container 14, so that the elastic member 15 is also contracted, and the collision energy is absorbed. Therefore, the amount of energy absorption can be increased. Here, the vertically long engaging concave portion 53a of the receiving cup 53 and the engaging convex portion 55a of the sliding cup 55 function as an example of the engaging means.

  The present invention is not limited to the first to fourth embodiments, and various improvements, modifications, additions, and deletions can be made without departing from the scope of the present invention. is there. For example, the following may be performed.

  (A) For example, the pair of engagement pieces 123a and 123b and the pair of engagement holes 113a and 113b according to the first and second embodiments are aligned on the same straight line along the axial direction (sliding direction). Are arranged at predetermined intervals, but each combination of the engagement piece 123a and the engagement hole 113a and the combination of the engagement piece 123b and the engagement hole 113b may be arranged so as to be shifted from each other by a predetermined angle in the circumferential direction. . Thereby, the same effect as each of the shock absorbing units 10 and 31 according to the first embodiment and the second embodiment can be obtained.

  In addition, the pair of engagement pieces 123a and 123b and the pair of engagement recesses 45a and 45b according to the third embodiment are arranged at predetermined intervals on the same straight line along the axial direction (sliding direction). However, each combination of the engagement piece 123a and the engagement recess 45a and the combination of the engagement piece 123b and the engagement recess 45b may be arranged so as to be shifted from each other by a predetermined angle in the circumferential direction. Thereby, the same effects as those of the shock absorbing unit 41 according to the third embodiment can be obtained.

  (B) Also, for example, the pair of engaging pieces 123a and 123b and the pair of engaging holes 113a and 113b according to the first and second embodiments are respectively formed by the receiving cup 11a and the sliding cup 11b. Although provided at one location in the circumferential direction, it may be provided at multiple locations in the circumferential direction. Thus, the forward movement of the receiving cup 11a and the bumper reinforcement 1 can be more reliably stopped. Further, the side wall 112 on the front side of the engagement hole 113b of the receiving cup 11a can be more reliably buckled and shrunk in a bellows shape along the inner wall of the container 14 under the collision load, thereby reducing the collision energy. Can be efficiently absorbed.

  (C) Also, for example, the pair of engagement pieces 123a and 123b and the pair of engagement recesses 45a and 45b according to the third embodiment are provided at one location in the circumferential direction of each of the receiving cup 43 and the sliding cup 11b. , But may be provided at a plurality of positions in the circumferential direction. Thereby, the forward movement of the receiving cup 43 and the bumper reinforcement 1 can be more reliably stopped. Further, the side wall 112 on the front side of the engagement concave portion 45b of the receiving cup 43 can be more reliably buckled and contracted in a bellows shape along the inner wall of the container 14 under the collision load, and the collision energy can be reduced. Can be efficiently absorbed.

  (D) Also, for example, the vertically long engaging concave portion 53a and the engaging convex portion 55a according to the fourth embodiment are provided at one position in the circumferential direction of each of the receiving cup 53 and the sliding cup 55. May be provided at a plurality of locations. Thus, the forward movement of the receiving cup 53 and the bumper reinforcement 1 can be more reliably stopped. Further, the side wall 112 on the front side of the locking groove 53d of the vertically long engaging concave portion 53a of the receiving cup 53 is more reliably buckled and contracted in a bellows shape along the inner wall of the container 14 under the impact load. And the collision energy can be efficiently absorbed.

  (E) Also, for example, the receiving cups 11a, 43, 53, the sliding cups 11b, 32, 55, the container 14, the cover 13 and the like according to the first to fourth embodiments have a cylindrical shape. However, a rectangular tube shape such as a triangular, quadrangular or pentagonal cross section may be used. Accordingly, it is possible to suppress a rotational deviation in the circumferential direction between each of the receiving cups 11a, 43, 53 and each of the sliding cups 11b, 32, 55.

  (F) In the first to fourth embodiments, the present invention is applied to an automobile, but may be applied to various vehicles other than an automobile. In the first to fourth embodiments, two impact absorbing units 10, 31, 41, and 51 are used in combination, but only one may be used, or three or more may be used in combination. May be used.

1 bumper reinforcement (collision load receiving member)
2L, 2R Front member (body structural member)
21 Top member 10, 31, 41, 51 Shock absorbing unit (shock absorbing device for vehicle)
11, 42, 52 Inflator 11a, 43, 53 Receiving cup 11b, 32, 55 Sliding cup 11c Space 12 Inflator (fluid supply means)
Reference Signs List 13 cover body 14 container 15 elastic member 15a folding position 45a, 45b engaging recess 48 exhaust valve (discharge means)
53a vertically long engaging concave portion 53c step portion 53d locking groove 55a engaging convex portion 113a, 113b engaging hole 123a, 123b engaging piece 125a, 125b notch line 151 for engaging piece 151 projecting portion

Claims (8)

A collision load receiving member that is provided to receive a collision load with a vehicle body structural member of a colliding portion of the vehicle body and receives a collision load from a collision object and transmits the collision load to a vehicle body structural member;
An inflatable body provided between the collision load receiving member and the vehicle body structural member to form one space;
A fluid supply unit that supplies a fluid to the space in the inflatable body before collision to expand the volume of the space, and expands the inflatable body;
With
The inflatable body is
A container-shaped receiving cup having an opening along the direction of the collision load and fixed to one of the collision load receiving member and the vehicle body structural member,
The receiving cup has an opening facing the opening, and is slidably inserted into the receiving cup in a state where the openings face each other, and one of the collision load receiving member and the vehicle body structural member. A container-shaped sliding cup fixed to the container and forming the space,
The maximum movement position of the collision load receiving member, which is provided between the receiving cup and the sliding cup, in which the insertion amount of the sliding cup into the receiving cup is minimized and the volume of the space is maximized. An engaging means for engaging the receiving cup and the sliding cup,
Has,
When the collision load receiving member receives a collision load, the receiving cup or the sliding cup fixed to the collision load receiving member out of the receiving cup and the sliding cup engaged by the engaging means. Deforms to absorb the collision energy ,
The engagement means includes:
An engagement hole formed in a side wall of the receiving cup, wherein an insertion amount of the sliding cup into the receiving cup is minimized and closed by the side wall of the sliding cup until the volume of the space is maximized;
When the insertion amount of the sliding cup into the receiving cup is minimized and the volume of the space is maximized, the sliding cup is formed at a position facing the engaging hole on the side wall of the sliding cup, and the space is formed. An engagement piece cut line for forming an engagement piece that is bent outward by the pressure of the fluid inside and pushed into the engagement hole;
Has,
When the engagement piece is pushed into the engagement hole, the receiving cup and the slide cup are engaged, and an internal pressure release hole communicating with the engagement hole is formed in a side wall of the slide cup. ,
Shock absorber for vehicles. In claim 1 ,
The receiving cup has at least a pair of the engagement holes along a sliding direction,
The sliding cup is at least one pair of the engagement pieces for forming at least a pair of the engagement pieces that are simultaneously pushed into the pair of engagement holes and protrude in opposite directions along the sliding direction. Having a score line for
Shock absorber for vehicles. In claim 2 ,
Of the pair of engagement pieces, the engagement piece that receives the collision load via the engagement hole has a protruding portion that protrudes outside the sliding cup by a predetermined height at a distal end portion,
Shock absorber for vehicles. A collision load receiving member that is provided to receive a collision load with a vehicle body structural member of a colliding portion of the vehicle body and receives a collision load from a collision object and transmits the collision load to a vehicle body structural member;
An inflatable body provided between the collision load receiving member and the vehicle body structural member to form one space;
A fluid supply unit that supplies a fluid to the space in the inflatable body before collision to expand the volume of the space, and expands the inflatable body;
With
The inflatable body is
A container-shaped receiving cup having an opening along the direction of the collision load and fixed to one of the collision load receiving member and the vehicle body structural member,
The receiving cup has an opening facing the opening, and is slidably inserted into the receiving cup in a state where the openings face each other, and one of the collision load receiving member and the vehicle body structural member. A container-shaped sliding cup fixed to the container and forming the space,
The maximum movement position of the collision load receiving member, which is provided between the receiving cup and the sliding cup, in which the insertion amount of the sliding cup into the receiving cup is minimized and the volume of the space is maximized. An engaging means for engaging the receiving cup and the sliding cup,
Has,
When the collision load receiving member receives a collision load, the receiving cup or the sliding cup fixed to the collision load receiving member out of the receiving cup and the sliding cup engaged by the engaging means. Deforms to absorb collision energy ,
The engagement means includes:
An outwardly recessed member formed on the side wall of the receiving cup and closed by the side wall of the sliding cup until the amount of insertion of the sliding cup into the receiving cup is minimized and the volume of the space is maximized. Has a joint recess,
When the amount of insertion of the sliding cup into the receiving cup is minimized and the volume of the space is maximized, the sliding cup is formed at a position facing the engaging recess on the side wall of the sliding cup, and the space is formed. An engagement piece cut line for forming an engagement piece that is bent outward by the pressure of the fluid inside and pushed into the engagement recess;
Has,
The receiving cup and the sliding cup are engaged by the engagement piece being pushed into the engagement recess,
Shock absorber for vehicles. In claim 4 ,
The receiving cup has at least a pair of the engagement recesses along a sliding direction,
The sliding cup is for at least one pair of the engagement pieces for forming at least one pair of the engagement pieces that are pushed into the pair of engagement recesses and protrude in opposite directions along the sliding direction. Having a score line,
Shock absorber for vehicles. A collision load receiving member that is provided to receive a collision load with a vehicle body structural member of a colliding portion of the vehicle body and receives a collision load from a collision object and transmits the collision load to a vehicle body structural member;
An inflatable body provided between the collision load receiving member and the vehicle body structural member to form one space;
A fluid supply unit that supplies a fluid to the space in the inflatable body before collision to expand the volume of the space, and expands the inflatable body;
With
The inflatable body is
A container-shaped receiving cup having an opening along the direction of the collision load and fixed to one of the collision load receiving member and the vehicle body structural member,
The receiving cup has an opening facing the opening, and is slidably inserted into the receiving cup in a state where the openings face each other, and one of the collision load receiving member and the vehicle body structural member. A container-shaped sliding cup fixed to the container and forming the space,
The maximum movement position of the collision load receiving member, which is provided between the receiving cup and the sliding cup, in which the insertion amount of the sliding cup into the receiving cup is minimized and the volume of the space is maximized. An engaging means for engaging the receiving cup and the sliding cup,
Has,
When the collision load receiving member receives a collision load, the receiving cup or the sliding cup fixed to the collision load receiving member out of the receiving cup and the sliding cup engaged by the engaging means. Deforms to absorb collision energy ,
The engagement means includes:
Formed on the side wall of the receiving cup along the sliding direction, and having a length equal to or greater than the moving distance of the collision load receiving member from the maximum to the minimum insertion amount of the sliding cup into the receiving cup, And a vertically engaging recess recessed outwardly closed by a side wall of the sliding cup until an insertion amount of the sliding cup into the receiving cup is minimized;
An engagement projecting outward from the side wall of the sliding cup in a direction perpendicular to the sliding direction by a predetermined height, and is movably fitted into the vertically long engaging recess along the sliding direction. Convex parts,
Has,
The vertical engagement recess has a step at an end opposite to the impact load receiving member, the step protruding inward of the vertical engagement recess along a direction orthogonal to a sliding direction. ,
When the amount of insertion of the sliding cup into the receiving cup is minimized and the volume of the space is maximized, the engagement convex portion climbs over the step portion, and The receiving cup and the sliding cup are engaged by being fitted between a step portion and an end edge portion opposite to the impact load receiving member.
Shock absorber for vehicles. In any one of claims 4 to 6 ,
The inflatable body has a discharge unit that discharges the fluid when an internal pressure in the inflatable body becomes equal to or higher than a predetermined pressure.
Shock absorber for vehicles. In any one of claims 1 to 7 ,
A cover body is provided so as to cover the outer peripheral side of the inflatable body, and is deformed to allow expansion of the inflatable body and deformation of the receiving cup or the sliding cup,
The cover body,
A container that houses the inflatable body and includes an opening that opens an inflation direction of the inflatable body so as not to prevent the inflatable body from expanding;
A tubular elastic member coupled to the opening of the container,
Consisting of
The elastic member is folded halfway so that one side and one side face each other, and both ends are configured on the same side with respect to the folded position, and the one side and one side It is expanded and contracted by changing the facing area,
Shock absorber for vehicles.

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