WO2017208506A1

WO2017208506A1 - Impact absorbing device for vehicles

Info

Publication number: WO2017208506A1
Application number: PCT/JP2017/005169
Authority: WO
Inventors: 和章北口; 洋康小坂; 旬一高柳; 尚裕齊藤; 岳樹福山; 崇至佐々木
Original assignee: 豊田鉄工株式会社; トヨタ自動車株式会社
Priority date: 2016-06-02
Filing date: 2017-02-13
Publication date: 2017-12-07
Also published as: JP6567464B2; JP2017214027A

Abstract

An expansion body (11) is provided with: a container-shaped receiving cup (11a) affixed to a bumper reinforcement (1) and having an opening directed toward a front member (2L); and a container-shaped sliding cup (11b) affixed to the front member (2L) through the container (14) and having an opening facing the opening of the receiving cup (11a). The sliding cup (11b) is inserted in the receiving cup (11a) to form a single space (11c), and the volume of the space (11c) is changed by a change in the amount of the insertion of the sliding cup (11b). An inflator (12) is disposed within the sliding cup (11b).

Description

Shock absorber for vehicle

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

As a vehicle impact absorbing device, a device has been developed in which a collision load receiving member such as a bumper installed at the front end of the vehicle projects forward immediately before a collision with a collision object (Japanese Patent Laid-Open No. 2010-241240, US Patent). No. 6189941). Specifically, an expansion body is provided between the collision load receiving member and the vehicle structure, and an inflator is provided in the expansion body. Normally, the expansion body is contracted and the collision load receiving member is located at the front end of the vehicle structure. However, the inflator is activated immediately before the collision, and the expansion body expands due to the gas generated from the inflator, and the collision occurs. The load receiving member protrudes forward away from the vehicle structure. At the time of collision, the expanded body can absorb the collision energy while contracting.

In such an impact absorbing device for a vehicle, the expansion body is formed of a thin metal plate, and there is a possibility that cracks may occur at a portion having a large deformation amount when the expansion body is expanded and deformed by the gas from the inflator. When a crack occurs in the expanded body, gas leaks from the cracked portion, and the expanded body cannot be expanded as planned.

Therefore, there is a need in the present technical field for an improved vehicle shock absorber in terms of the above points.

One aspect of the present disclosure is a shock absorber for a vehicle that absorbs collision energy, and is provided so as to receive a collision load by a vehicle body structural member of a collision portion of the vehicle body, and receives a collision load from a collision object. A collision load receiving member for transmitting to the structural member, an expansion body provided between the collision load receiving member and the vehicle body structural member to form a space, and supplying fluid to the space in the expansion body before the collision. Fluid supply means for expanding the volume of the space and expanding the expansion body. When the collision load receiving member receives a collision load, the volume of the space is reduced while discharging the fluid in the expansion body. Thus, the expansion body is contracted. The expansion body includes a container-shaped receiving cup having an opening along the direction of the collision load, and a sliding body that is slidably inserted into the receiving cup and forms the space therebetween. The receiving cup is fixed to either the collision load receiving member or the vehicle body structural member. The sliding body is fixed to the other of the collision load receiving member or the vehicle body structural member. The volume of the space is changed by changing the amount of the sliding body inserted into the receiving cup. The impacted part may be any of the front, rear, side, roof, etc. of the vehicle body. The fluid supplied to the space in the expansion body may be any of gas, oil, air, and the like. When the fluid is supplied by the fluid supply means, the sliding body slides with respect to the receiving cup forming the expanding body, and the collision load receiving member is moved in the collision direction. At this time, since the sliding body only slides and is not accompanied by deformation of the expanding body constituent member, the expanding body constituent member is not cracked. Therefore, it is possible to expand the expanding body as planned and move the collision load receiving member in the collision direction. Moreover, the expansion body can be contracted as planned to absorb the collision energy.

In some embodiments, a cover body is provided so as to cover the outer peripheral side of the expandable body, and is deformed to allow expansion and contraction of the expandable body. This cover body may be integrally formed by one member, or may be formed by a combination of a plurality of members. Further, the cover body may be coupled to the expansion body, or may be coupled to the vehicle body structural member and the collision load receiving member. When the expansion body expands and when the expansion body contracts due to a collision load, the cover body is deformed in synchronization. Therefore, it is possible to increase the energy absorption amount when the expanding body contracts in response to a collision load.

In some embodiments, formed on the side wall of the receiving cup, the sliding body is inserted into the receiving cup in a minimum amount, and is opened at a maximum moving position where the volume of the space is maximized. On the side where the amount increases and the volume of the space decreases, a through hole is provided that is closed by the side wall of the sliding body. The number of through holes can be one or more. By providing a through hole in the receiving cup according to the preset maximum moving position of the sliding body as described above, when the sliding body reaches that position, the fluid from the fluid supply means flows out of the through hole, The movement of the sliding body can be stopped. When the amount of movement of the sliding body relative to the receiving cup is zero or the movement position of the sliding body does not reach the maximum movement position, the through hole is closed by the sliding body. For this reason, the through-hole does not adversely affect the movement of the sliding body due to the supply of fluid from the fluid supply means. Also, when the sliding body moves in the direction of returning from the maximum movement position in response to a collision load, the through hole is immediately closed, so that the through hole does not adversely affect the function of absorbing the collision energy.

In some embodiments, the sliding body is a container-shaped sliding cup that has an opening facing the opening of the receiving cup and slides in the receiving cup with the openings facing each other. When the sliding body is thus a sliding cup, the fluid supplied from the fluid supply means can be received by the container of the sliding cup. Therefore, when the fluid pressure is effectively received by the sliding cup and the fluid is supplied from the fluid supply means, the sliding cup can be efficiently moved to move the collision load receiving member.

In some embodiments, the sliding cup is formed on one of the side walls that overlap each other when the sliding cup is inserted into the receiving cup, and the insertion amount of the sliding cup into the receiving cup is minimized, and the volume of the space is reduced. On the side where the insertion amount is larger than that position and the volume of the space is reduced, a through hole is provided that is closed by the other side wall. The number of through holes can be one or more. Further, the through hole may be provided in either the receiving cup or the sliding cup, or may be provided in both. By providing the through hole in accordance with the preset maximum movement position of the sliding cup as described above, when the sliding cup reaches that position, the fluid from the fluid supply means flows out of the through hole and slides. The movement of the moving cup can be stopped. When the moving amount of the sliding cup relative to the receiving cup is zero or the moving position of the sliding cup does not reach the maximum moving position, the through hole is closed by the opposing cup. For this reason, the through hole does not adversely affect the movement of the sliding cup due to the supply of fluid from the fluid supply means. Also, when the sliding cup moves in the direction of returning from the maximum movement position in response to a collision load, the through hole is immediately closed, so that the through hole does not adversely affect the function of absorbing the collision energy.

In some embodiments, a container for containing the expansion body is provided. The container includes an opening that is held by the vehicle body structural member and opens the expansion direction of the expansion body so as not to prevent the expansion body from expanding. Since the expansion body is accommodated in the container, the expansion body and the fluid supply means can be sub-assembled by the container. Therefore, the handleability as a part can be improved, and the assembly workability to the vehicle body can be improved.

In some embodiments, the container includes a flange around the opening and is held in the vehicle body structural member. And the said flange part is engaged with the peripheral part of the said vehicle body structural member. For this reason, the reaction force when the expansion body is expanded by being supplied with fluid can be received by the container and transmitted to the vehicle body structural member via the flange portion. Therefore, the reliability of fixing can be improved as compared with the case where the reaction force is received using fixing means such as a bolt.

In some embodiments, a cover body is provided so as to cover the outer peripheral side of the expandable body, and is deformed to allow expansion and contraction of the expandable body. The cover body accommodates the expansion body and includes a container having an opening that opens an expansion direction of the expansion body so as not to prevent the expansion body from expanding, and a cylindrical shape coupled to the opening of the container It is comprised by the expansion-contraction member. The elastic member is folded in the middle so that one side and one side face each other, and both end portions are located on the same side with respect to the folded position, and the one side and one side It can be expanded and contracted by changing the facing area. When the expansion body changes between a contracted state and an expanded state, the expansion / contraction member is expanded and contracted by moving the folding position following the expansion. Therefore, the space occupied by the expansion / contraction member can be smaller than when the expansion / contraction member has a bellows structure. Therefore, the expansion body can be enlarged in the container.

In some embodiments, the fluid supply means is fixed to the receiving cup or the sliding body fixed to the vehicle body structural member. In order for the fluid supply means to start supplying fluid, a trigger signal from the vehicle body side is required. However, when the fluid supply means is fixed to the receiving cup or the sliding body fixed to the vehicle body side structural member as described above, the fluid supply means does not move relative to the vehicle body side structural member, and the fluid supply means is triggered. It is possible to eliminate the need to provide a surplus length in a path such as a wire harness for supplying a signal. That is, when the fluid supply means and the vehicle body side structural member move relative to each other, in addition to the path length of the wire harness or the like required for supplying a trigger signal when the relative movement does not occur, the relative movement is required. Although it is necessary to lengthen the path length extra, the above-described structure can eliminate the extra length.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a bumper structure of a front portion of a vehicle to which a vehicle shock absorber as a first embodiment of the present invention is applied. It is an expansion perspective view which shows a part of bumper structure of FIG. 1 in a permeation | transmission state. FIG. 3 is an enlarged cross-sectional view taken along line III-III of the bumper structure of FIG. It is sectional drawing in the same position as FIG. 3 which shows the bumper structure in the middle state in which the gas is supplied from the inflator and the bumper is moving ahead. It is sectional drawing in the same position as FIG. 3 which shows the bumper structure in the state where gas was supplied from the inflator and the movement of the bumper to the front was completed. It is sectional drawing in the same position as FIG. 3 which shows the bumper structure in the middle state which the bumper receives the collision load and is moving back. It is sectional drawing corresponding to FIG. 3 which shows the impact-absorbing device for vehicles as 2nd Embodiment of this invention. It is sectional drawing in the same position as FIG. 7 which shows the bumper structure in the middle state in which the gas is supplied from the inflator and the bumper is moving ahead. It is sectional drawing in the same position as FIG. 7 which shows the bumper structure in the state where gas was supplied from the inflator and the movement of the bumper to the front was completed. It is sectional drawing in the same position as FIG. 7 which shows the bumper structure in the middle state which the bumper receives the collision load and is moving back. It is sectional drawing corresponding to FIG. 3 which shows the impact-absorbing device for vehicles as 3rd Embodiment of this invention. It is sectional drawing corresponding to FIG. 3 which shows the impact-absorbing device for vehicles as 4th Embodiment of this invention.

1 to 3 show an example in which an impact absorbing device as a first embodiment of the present invention is provided in a front bumper portion for an automobile. In each figure, each direction of the apparatus in the state mounted in the motor vehicle is shown by an arrow. In the following description, the description regarding the direction is made based on this direction.

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

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

The expansion body 11 is formed by combining a cylindrical container-shaped receiving cup 11a and a sliding cup 11b. The bottom of the receiving cup 11a is fixed to the bumper reinforcement 1 via an elastic member 15 described later, and the opening of the container is directed rearward, that is, toward the proximal end of the front member 2L. The bottom of the sliding cup 11b is fixed to the lower part of the container 14, and the opening is provided in a direction facing the opening of the receiving cup 11a. The sliding cup 11b is inserted into the receiving cup 11a to form one space 11c therebetween. Then, the volume of the space 11c is changed by changing the amount of insertion of the sliding cup 11b into the receiving cup 11a. The receiving cup 11a may be fixed to the bottom of the container 14, and the sliding cup 11b may be fixed to the bumper reinforcement 1.

An inflator 12 as fluid supply means is fixed to the bottom of the sliding cup 11b. The inflator 12 is a well-known one similar to the inflator used in the occupant protection airbag device, and is configured to be ignited immediately before a vehicle collision to generate gas (corresponding to the fluid of the present invention). Therefore, when the inflator 12 generates gas, the receiving cup 11a slides forward with respect to the sliding cup 11b and moves the bumper reinforcement 1 forward as indicated by an arrow in FIG.

The expansion body 11 is accommodated in a cylindrical container 14. The opening 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 as the inflator 12 generates gas so as not to prevent the expansion body 11 from expanding. A flange portion 14a is formed in the opening of the container 14 over the entire circumference. On the other hand, the 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 central portion. And the flange part 14a of the container 14 is engaged with the opening peripheral part of the top member 21. As shown in FIG. Accordingly, 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 expansion body 11 is accommodated in the container 14 as described above, the expansion body 11 and the inflator 12 can be sub-assembled by the container 14. Therefore, the handleability as a part can be improved, and the assembly workability to the vehicle body can be improved. Further, 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 portion 14a. Therefore, the reliability of fixing can be improved as compared with the case where the reaction force is received using fixing means such as a bolt.

The flange 14a 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 back halfway so that one side surface and one side surface thereof face each other. And it is comprised so that the bottom part and edge part of the expansion-contraction member (cylindrical body) 15 may be located in the same side with respect to the folding | turning position 15a. The bottom part of the elastic member 15 is fixed between the bumper reinforcement 1 and the receiving cup 11a, and the end part is fixed to the flange part 14a. Further, the folding position 15 a of the elastic member 15 is disposed along the inner wall of the container 14. When the bumper reinforcement 1 moves forward as shown in FIG. 4, the bottom of the elastic member 15 also moves forward, so that the folding position 15 a of the elastic member 15 moves forward, and the longitudinal dimension of the elastic member 15 is increased. To do. That is, the facing area between one side surface and one side surface of the elastic member 15 is reduced.

As described above, when the expansion body 11 changes between the contracted state and the expanded state, the expansion / contraction member 15 is expanded and contracted by moving the folding position 15a. Therefore, the space occupied by the expansion / contraction member 15 can be smaller than when the expansion / contraction 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.

The combination of the container 14 and the elastic member 15 constitutes the cover body 13 of the present invention. Therefore, when the expandable body 11 expands and when the expandable body 11 contracts due to a collision load, the elastic member 15 of the cover body 13 is deformed in synchronization. Therefore, it is possible to increase the amount of energy absorbed when the expanding body 11 contracts in response to a collision load.

FIG. 4 shows a state in which the inflator 12 generates gas, the receiving cup 11a forming the expansion body 11 slides forward, and the bumper reinforcement 1 moves forward. FIG. 5 shows a state in which the movement of the receiving cup 11a and the bumper reinforcement 1 has been completed. With the movement of the bumper reinforcement 1, the folding position 15a of the elastic member 15 is also moved forward. In this way, the bumper reinforcement 1, that is, the bumper moves forward, thereby preparing for a collision. The state in which the movement of the receiving cup 11a and the bumper reinforcement 1 has been completed is the “position where the insertion amount with respect to the other one of the receiving cup and the sliding cup is minimized and the volume is maximized” in the present invention. Equivalent to.

After that, when the collision object collides with the bumper, the bumper and bumper reinforcement 1 are pushed backward as shown by the arrows in FIG. Therefore, the receiving cup 11a constituting the expansion body 11 is slid rearward. At this time, the gas filled in the space 11c between the receiving cup 11a and the sliding cup 11b is gradually discharged out of the space 11c through a gap (not shown). During this time, the collision energy is absorbed and the shock accompanying the collision is alleviated. At the same time, the folding position 15a of the elastic member 15 is also moved rearward, and the elastic member 15 is contracted. The collision energy is also absorbed by the contraction of the expansion / contraction member 15, and the amount of energy absorption increases together with the amount of the expansion body 11.

As described above, in the expansion and contraction of the expansion body 11 before and after the collision, the receiving cup 11a only slides and is not accompanied by deformation of the expansion body constituent member, so that the expansion body constituent member is not cracked. Therefore, the bumper reinforcement 1 can be moved in the collision direction by expanding the expansion body 11 as scheduled. Moreover, the expansion body 11 can be contracted as planned to absorb the collision energy.

FIG. 7 shows a bumper structure provided with an impact absorbing device as a second embodiment of the present invention. The feature of the second embodiment over the first embodiment described above is that the through hole 11d is provided in the sliding cup 11b. The other components of the second embodiment can be the same as those of the first embodiment.

FIGS. 8 and 9 correspond to FIGS. 4 and 5 and show the movement of the receiving cup 11a when the inflator 12 generates gas. The through hole 11d of the sliding cup 11b is formed on the side wall of the sliding cup 11b that covers the side wall of the receiving cup 11a in a state where the sliding cup 11b is inserted into the receiving cup 11a. In addition, the through hole 11d of the sliding cup 11b is formed at a position where the through hole 11d is not covered with the side wall of the receiving cup 11a in a state where the movement of the receiving cup 11a is completed as shown in FIG. Therefore, as shown in FIGS. 7 and 8, when the amount of forward movement of the receiving cup 11a is smaller than that of FIG. 9, the through hole 11d is covered and closed by the side wall of the receiving cup 11a.

According to the second embodiment, when the inflator 12 generates gas as shown in FIGS. 7 and 8, the through hole 11d of the sliding cup 11b is covered and closed by the side wall of the receiving cup 11a. Therefore, the receiving cup 11a is moved as shown in FIG. 8 as in the first embodiment without the through hole 11d. When the receiving cup 11a reaches the movement completion position as shown in FIG. 9, the through hole 11d is opened at a position where it does not cover the side wall of the receiving cup 11a. Therefore, the gas in the inflator 12 flows out from the through hole 11d and stops the movement of the receiving cup 11a. Thus, according to the second embodiment, the stop position of the receiving cup 11a can be determined by the position of the through hole 11d of the sliding cup 11b.

FIG. 10 corresponds to FIG. 6, and when the bumper reinforcement 1 moves rearward due to a collision, the through hole 11d is covered by the side wall of the receiving cup 11a. Therefore, the expansion body 11 can contract and absorb collision energy as in the first embodiment without the through hole 11d.

FIG. 11 shows a bumper structure provided with an impact absorbing device as a third embodiment of the present invention. The third embodiment is characterized by the point that the receiving cup 11a is fixed to the container 14 instead of the bumper reinforcement 1 and the sliding body is not a sliding cup 11b but a piston shape. This is a point constituted by the sliding body 11e. Other components of the third embodiment can be the same as those of the first embodiment.

The sliding body 11e is slidably inserted into the receiving cup 11a to form a space between the receiving cup 11a. The receiving cup 11a has its bottom fixed to the bottom of the container 14, and the sliding body 11e has its front side fixed to the bumper reinforcement 1 via the rod 11f and the bottom of the telescopic member 15. The receiving cup 11 a may be fixed to the bumper reinforcement 1 and the rod 11 f may be fixed to the bottom of the container 14.

When the inflator 12 accommodated in the receiving cup 11a generates gas, the sliding body 11e is moved forward. Therefore, the rod 11f moves forward through the bumper reinforcement 1 to prepare for a collision.

When the collision object collides with the bumper, the bumper and bumper reinforcement 1 are pushed backward. Therefore, the sliding body 11e is slid backward in the receiving cup 11a via the rod 11f. At this time, the gas filled in the space between the receiving cup 11a and the sliding body 11e is gradually discharged out of the space through a gap (not shown). During this time, the collision energy is absorbed and the shock accompanying the collision is alleviated.

FIG. 12 shows a bumper structure provided with an impact absorbing device as a fourth embodiment of the present invention. The feature of the fourth embodiment over the first embodiment is that the elastic member 15 is a cylindrical body without a bottom. The other components of the fourth embodiment are the same as those of the first embodiment, and a repetitive description of the same parts is omitted.

One end of the elastic member 15 is fixed to the flange portion 14 a of the container 14, and the other end is fixed to the bumper reinforcement 1. The receiving cup 11 a is directly fixed to the bumper reinforcement 1.

In the fourth embodiment, the cylindrical body of the expansion / contraction member 15 has no bottom, but the shock absorbing unit 10 can function in the same manner as in the first embodiment in which the expansion / contraction member 15 is a bottomed cylindrical body. it can.

As yet another embodiment, the impact absorbing device for vehicles may be applied to various vehicles other than automobiles instead of being applied to automobiles. As yet another embodiment, instead of using two shock absorbing units in combination, only one may be used, or three or more may be used in combination. As yet another embodiment, the receiving cup, the sliding cup, the cover body and the like may be formed in a rectangular tube shape instead of a cylindrical shape.

Although various embodiments of the present invention have been described above using specific structures, such structures are merely examples, and those skilled in the art will appreciate that various modifications can be made to these embodiments without departing from the spirit of the present invention. Changes, additions and deletions can be made.

Claims

A vehicle shock absorber for absorbing collision energy,
A collision load receiving member that is provided so as to receive a collision load at a vehicle body structural member of a collision portion of the vehicle body, and that receives a collision load from a collision object and transmits the collision load to the vehicle body structural member;
An inflatable body provided between the collision load receiving member and the vehicle body structural member to form one space;
Fluid supply means for expanding the volume of the space by supplying a fluid to the space in the expansion body before the collision, and expanding the expansion body;
When the collision load receiving member receives a collision load, the volume of the space is reduced while discharging the fluid in the expansion body, and the expansion body is contracted.
The inflatable body includes a container-shaped receiving cup having an opening along the direction of the collision load, and a sliding body that is slidably inserted into the receiving cup and forms the space therebetween.
The receiving cup is fixed to either the collision load receiving member or the vehicle body structural member,
The sliding body is fixed to the other of the collision load receiving member or the vehicle body structural member,
A vehicle impact absorbing device in which a volume of the space is changed by a change in an insertion amount of the sliding body into the receiving cup.
The shock absorber for a vehicle according to claim 1,
A shock absorber for a vehicle, comprising a cover body that is arranged so as to cover an outer peripheral side of the expansion body and is deformed so as to allow expansion and contraction of the expansion body.
The vehicle impact absorbing device according to claim 1 or 2,
Formed on the side wall of the receiving cup, the amount of insertion of the sliding body into the receiving cup is minimized, the space is opened at a maximum moving position where the volume is maximized, and the insertion amount is larger than that position, A vehicle impact absorbing device including a through hole that is closed by a side wall of the sliding body on a side where the volume of the space is reduced.
The vehicle impact absorbing device according to claim 1 or 2,
The vehicular shock absorbing device is a container-shaped sliding cup that has an opening facing the opening of the receiving cup and slides in the receiving cup in a state where the openings face each other.
The vehicle impact absorbing device according to claim 4,
It is formed on any one of the side walls that overlap each other when the sliding cup is inserted into the receiving cup, the insertion amount of the sliding cup into the receiving cup is minimized, and the volume of the space is maximized A vehicle shock absorber provided with a through-hole that is opened at a moving position, the insertion amount is larger than that position, and the volume of the space is reduced, and is closed by the other side wall.
The vehicle impact absorbing device according to any one of claims 1 to 5,
A container for accommodating the inflatable body;
The container is an impact absorbing device for a vehicle provided with an opening that is held by the vehicle body structural member and opens an expansion direction of the expansion body so as not to prevent the expansion body from expanding.
The vehicle impact absorbing device according to claim 6,
The container includes a flange portion around the opening, and is held in the vehicle body structural member.
The vehicle impact absorbing device, wherein the flange portion is engaged with a peripheral portion of the vehicle body structural member.
The vehicle impact absorbing device according to any one of claims 1 to 7,
A cover body that is arranged so as to cover the outer peripheral side of the expansion body, and is deformed to allow expansion and contraction of the expansion body;
The cover body accommodates the expansion body and includes a container having an opening that opens an expansion direction of the expansion body so as not to prevent the expansion body from expanding, and a cylindrical shape coupled to the opening of the container It is composed of elastic members,
The elastic member is folded in the middle so that one side and one side face each other, and both end portions are located on the same side with respect to the folded position, and the one side and one side A vehicle shock absorber that can be expanded and contracted by changing the facing area.
The vehicle shock absorber according to any one of claims 1 to 8,
The fluid supply means is a vehicle impact absorbing device fixed to the receiving cup or the sliding body fixed to the vehicle body structural member.