JPH10100847A - Energy absorbing structure at vehicle side part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the stability in expansion of an air bag by making a pad easily rupture stably in the specified direction while comfortable seating is being kept on with respect to an energy absorbing structure at a vehicle side part, which is provided with an air bag unit disposed in the specified direction in the inner side rather than a pad located in the vicinity of the side part within a seat. SOLUTION: A breaking boundary surface part 16 extended in the inside and outside direction between the pad main body 15a and an insertion member 15b formed in the aforesaid pad main body 15a by means of insertion molding, is provided for at least a part of a pad 15 laid in a space from the inner surface of a seat, which corresponds to an air bag unit 21, over to the outer surface of the seat, and it is so constituted that the pad 15 is widened so as to be broken at the breaking boundary surface part 16 while being subjected to the expansion pressure of an air bag 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy absorbing structure for a vehicle side, and more particularly to a technical field of an airbag unit provided in a seat.

[0002]

2. Description of the Related Art In recent years, for example, as shown in Japanese Patent Application Laid-Open No. 6-64491, an airbag unit is disposed on a side portion of a seat so that an airbag unit is provided at a side of an occupant at the time of a collision with a vehicle body. It has been proposed that the bag be deployed so that the deployed airbag absorbs side impact energy to protect the occupant.

[0003] When the airbag unit is arranged inside the pad near the side portion in the seat as in the above proposed example, the airbag is made to easily deploy from inside the seat to outside. Because it is necessary, for example, as shown in Japanese Utility Model Publication No. 8-1982, a pad corresponding to the airbag unit is provided with a cut groove or the like so that the pad is easily expanded and broken by the airbag deployment pressure. It has been known.

[0004]

However, in the case where the pad is provided with a kerf or the like as in the above-mentioned conventional example, in order to make the pad easily open and break and stabilize the rupture direction, the depth of the kerf must be increased. It is necessary to make the height greater than the pad thickness at that location. For this reason, when the occupant sits on the seat, the pad is abnormally deformed in the cut groove portion, and the cushioning property which is the original performance of the pad is deteriorated, and there is room for improvement.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the structure of the pad so that the occupant can maintain a comfortable sitting comfort while moving the pad in a predetermined direction. Another object of the present invention is to improve the stability of the deployment of the airbag by making it easier to break stably.

[0006]

In order to achieve the above object, according to the present invention, at least a part of a pad from an inner surface of a seat corresponding to an airbag unit to an outer surface of a seat includes a pad body and an insert member. , And the pad is expanded and ruptured by receiving the airbag deployment pressure at the rupture interface.

More specifically, according to the first aspect of the present invention, there is provided an airbag unit having an airbag to be deployed and arranged in a predetermined direction inside a pad near a side portion in a seat. It is assumed that the vehicle has an energy absorbing structure on the side.

The pad comprises a pad body and an insert member insert-molded in the pad body, and at least a part of the pad from the seat inner surface to the seat outer surface corresponding to the airbag unit, A rupture interface extending in the inward and outward directions of the seat between the pad body and the insert member is provided, and the pad is configured to expand and rupture under the deployment pressure of the airbag at the rupture interface. I do.

[0009] Thus, the pad body and the insert member insert-molded in the pad body are in a state of being joined by the insert molding at the breaking interface, so that the inside and outside of the sheet at the breaking interface are provided. Even if the length in the direction is increased with respect to the pad thickness at that point, the pad does not undergo abnormal deformation when the occupant sits on the seat, and the cushioning property is favorably maintained. On the other hand, since the pad body and the insert member are hardly assimilated at the breaking interface, the pad easily breaks at the breaking interface when the pad receives the airbag deployment pressure. Because of this,
Since the pad is broken in the inward and outward directions of the sheet in the direction in which the rupture boundary extends, the length of the rupture boundary in the sheet in and out of the sheet is increased with respect to the pad thickness at that location, so that the airbag can be reliably secured. The pad can be deployed outward from the seat from a fixed position. Therefore, with a simple configuration, it is possible to improve the deployment stability of the airbag while maintaining good occupant comfort.

According to a second aspect of the present invention, in the first aspect of the present invention, the pad is expanded by receiving the deployment pressure of the airbag on the seat inner surface of the pad corresponding to the breaking boundary between the pad body and the insert member. It is assumed that a pad expansion starting point setting unit which is a starting point of the opening and breaking is provided.

According to the present invention, since the pad reliably starts to be expanded and ruptured from the pad expansion starting point setting portion, the pad can be effectively guided from the pad expansion starting point setting portion to the boundary surface for rupture. The pad can be more smoothly expanded and broken. Therefore, the deployment of the airbag can be further stabilized.

According to a third aspect of the present invention, in the second aspect of the present invention, the airbag unit is configured so that the airbag is deployed in a direction substantially perpendicular to the longitudinal direction of the airbag unit. It is assumed that the airbag unit is provided over a predetermined length substantially along the longitudinal direction of the airbag unit.

[0013] As a result, the pads expand and break substantially synchronously in the longitudinal direction of the airbag unit, so that the entire airbag is deployed to the outside of the seat substantially simultaneously along the longitudinal direction. Therefore, the deployability of the airbag can be further improved.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the pad expansion starting point setting section is a cut groove formed by cutting the surface of the pad with a predetermined width and a predetermined depth.

By doing so, the cut groove portion of the pad becomes more fragile than the other portions, and the pad surely expands and breaks from the cut groove portion when receiving the deployment pressure of the airbag. Therefore, the specific configuration of the simple pad expansion starting point setting unit can be easily obtained.

According to a fifth aspect of the present invention, in the second or third aspect of the present invention, the pad expansion starting point setting section is a pad separating section formed by cutting the surface of the pad to a predetermined depth.

[0017] As a result, the pad separation portion is more fragile than the other portions, and the pad separation portion is necessarily expanded and ruptured from the pad separation portion. Therefore, the same function and effect as the fourth aspect of the invention can be obtained.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the insert member is made of a pad material.

Thus, the pad material is used for the insert member as in the case of the pad body, so that the pad cushioning property is further improved. Therefore, the sitting comfort of the occupant can be further improved.

According to a seventh aspect of the present invention, in the sixth aspect, the insert member has a hardness different from that of the pad body.

According to the present invention, even if the insert member is made of a pad material, assimilation of the pad main body and the insert member at the break interface can be prevented, and the pad can be reliably held at the break interface. Can be broken. Therefore, the expandability of the airbag can be stabilized while improving the cushioning properties of the pad.

According to an eighth aspect of the present invention, in the seventh aspect, the hardness of the insert member is set to be higher than that of the pad body.

As a result, the bubbles in the insert member become smaller than the pad body, so that it becomes more difficult to assimilate with the pad body. Therefore, the function and effect of the invention of claim 7 can be further enhanced.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects of the present invention, the airbag unit is disposed on a side portion of the seat closer to the side door near the seat.

Thus, the airbag can be easily deployed between the occupant and the side door closer to the occupant due to the side collision, and the occupant can be prevented from colliding with the side door. Therefore, further safety of the occupant can be ensured in the event of a side collision.

According to a tenth aspect of the present invention, in the ninth aspect of the present invention, the airbag unit is disposed in the seatback such that the airbag is deployed substantially in front of the seatback.

In this manner, since the side portion of the seat back is a side support portion bulging forward to support the occupant from the left and right directions, the airbag unit is disposed in a relatively large space inside the side support portion. can do. Therefore, the airbag unit can be accommodated in the seat without impairing the sitting comfort of the occupant.

In the eleventh aspect, in the ninth aspect, the airbag unit is provided in the seat cushion.
It is assumed that the airbag is disposed so as to be deployed substantially above the seat cushion.

As a result, the side portion of the seat cushion is also a side support portion bulging upward for supporting the occupant in the left-right direction, so that the airbag unit can be disposed in a relatively large space inside the side support portion. . Therefore, the same function and effect as the tenth aspect can be obtained.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 to 3 show a front left seat 1 of an automobile in an energy absorbing structure of a vehicle side according to Embodiment 1 of the present invention. This seat 1 has a seat cushion 2, a seat back 3, and a headrest 4. Sliders 7, 7 extending in the front-rear direction are provided below the left and right ends of the seat cushion 2, respectively.
The front and rear positions of the seat 1 can be adjusted by being engaged with left and right slide rails 8 fixed to the floor via 0 and 10. In addition, seat cushion 2
At the rear, a knuckle member 9 is provided rotatably about a rotation shaft 11 extending in the left-right direction, and the seat back 3 is rotatable around the rotation shaft 11 with respect to the seat cushion 2 via the knuckle member 9. And the angle of the seat back 3 can be adjusted.

The headrest 4 is attached to the seatback 3 by inserting frames 5, 5 projecting from the lower end surface thereof into two holes formed in the upper end surface of the seatback 3.

At the rear outer peripheral portion of the seat back 3,
A frame-shaped seatback frame 13 having upper and lower portions and left and right sides made of a steel pipe material is provided, and each frame 5 protruding from a lower end surface of the headrest 4 is fitted on the upper portion of the seatback frame 13. Two headrest adjustment members 14, 14 that can adjust the position of the headrest 4 in the vertical direction are fixedly attached.

Between the left and right sides of the seat back frame 13, a plurality of wire frames 1 extending in the left and right direction, which are made of a wire having a smaller diameter than the seat back frame 13, are provided.
8, 18, ... are provided. Both ends of each of the wire frames 18 are fixed to the front sides of the left and right sides of the seat back frame 13 by welding.

Pads 15 are provided on the front side of the respective wire frames 18, and the pads 15 are supported by the respective wire frames 18 so that when the occupant leans on the seat back 3, they do not escape backward. The pad 15 is supported by the seat back frame 13 such that an end of the pad 15 extends backward from the outside of the seat back frame 13. The outer surface of the pad 15 is covered with a skin material 19 made of a thin cloth.

The left and right ends of the seat cushion 2 are provided with side support portions 2a, 2a swelling upward, and the left and right ends of the seat back 3 are provided with side support portions 3a, 3a swelling forward. It plays a role in supporting the user not to move left and right.

An airbag unit 21 is provided in the seat back 3 near the side of the side door close to the seat 1, that is, inside the pad 15 of the left side support portion 3a. This airbag unit 2
1 has a module can 22 having a substantially U-shaped cross section, in which a cylindrical can-shaped inflator 23 having a built-in ignition portion and an explosive inside the module can 22 is folded toward the opening side. The airbags 24 are respectively housed.
Although not shown, an ignition signal is supplied to an ignition portion of the inflator 23 from an acceleration sensor that detects a side collision to the left side of the vehicle, and the ignition portion ignites the explosive according to the ignition signal. Burns at a high speed, and a large amount of gas generated at that time causes the airbag 24 to expand and deploy in a direction substantially perpendicular to the longitudinal direction of the airbag unit 21, that is, in the opening direction of the module can 22.

The airbag unit 21 is disposed so that its longitudinal direction substantially coincides with the vertical direction of the seat back 3, and two sets of upper and lower bolts 27, 27 and nuts 28, 28 are provided on the side surface of the module can 22. At mounting member 26
Is fastened to one end. The other end of the attachment member 26 is attached and fixed to the seat back frame 13 by welding. Thus, the airbag unit 21 is fixed to the seat back frame 13 via the attachment member 26. The airbag unit 21 is disposed such that the opening direction of the module can 22, that is, the direction in which the airbag 24 is deployed, is inclined leftward with respect to the front.

The pad 15 comprises a pad body 15a and an insert member 15b insert-molded on the pad body 15a.
It is made of a pad material having a higher hardness than the pad body 15a. The insert member 15b is provided at a position from the front side to the rear left side of the airbag unit 21 at a position substantially at the same height as the module can 22 in the vertical direction of the seat back 3 and over substantially the same length, In the entire region of the pad 15 corresponding to the airbag unit 21 from the inner surface of the seat to the outer surface of the seat, a breaking boundary 16 extending between the pad main body 15a and the insert member 15b in the inward and outward directions of the seat is provided. In other words, the breaking boundary surface portion 16 is provided substantially in front of the opening of the module can 22 in the airbag unit 21 along the opening direction. The pad body 15a and the insert member 15b are joined by insert molding at the boundary surface portion 16 for breakage, but they are hardly assimilated. 15 is configured to be expanded and ruptured at the rupture boundary surface portion 16.

The pad body 15a and the insert member 1
In the sheet inner surface of the pad 15 corresponding to the rupture boundary surface 16 with the pad 5b, a notch is formed as a pad expansion starting point setting section serving as a starting point for the pad 15 to start rupture under the deployment pressure of the airbag 24. A groove portion 33 is provided, and the cut groove portion 33 is formed by cutting the inner surface of the pad 15 at a predetermined width and a predetermined depth so as to include the boundary surface portion 16 for breakage, and the pad 15 is more fragile than other portions. It is to be. The cut groove 33 is formed in the longitudinal direction (up and down direction) of the airbag unit 21 similarly to the insert member 15b.
At substantially the same height as the module can 22 and over substantially the same length. When the airbag 24 is deployed, the pad 15 starts to break from the cut groove 33 due to the deployment pressure. 15 is being broken. The depth of the cut groove 33 is set to be very small with respect to the thickness of the pad 15 at that location.

A seam that is easily broken is formed on the skin material 19 substantially on the extension line of the breaking boundary 16, and the skin material 19 is also broken at the seam portion by the deployment pressure of the airbag 24, The airbag 24 is arranged to be deployed forward of the seat back 3 and between the occupant of the seat 1 and the left side door from the portion where the opening 15 of the skin material 19 has been opened and broken.

The operation when the airbag 24 is deployed by the side collision in the vehicle side energy absorbing structure having the above configuration will be described. First, when the acceleration sensor detects a side impact on the left side of the vehicle, an ignition signal is supplied to the ignition unit of the inflator 23, and the ignition unit is ignited. As a result, the explosive in the inflator 23 burns at a high speed, and a large amount of gas is supplied to the airbag 24.
Tries to expand and expand. And this airbag 24
Tries to expand in the opening direction of the module can 22,
The pad 15 is brought into contact with the inner surface of the sheet of the pad 15 to push the pad 15 from the inside of the sheet to the outside by the developing pressure. For this reason,
The pad 15 begins to expand and break from its fragile portion, that is, the cut groove 33, and the pad body 15a and the insert member 1
5b is hardly assimilated at the rupture boundary 16, so that the pad 15 ruptures from the inside to the outside of the sheet at the rupture boundary 16 continuous with the cut groove 33.

Subsequently, the skin material 19 is broken by the seam, and the airbag 24 is deployed to the outside front of the seat back 3 from the portion where the pad 15 and the skin material 19 are expanded and broken, so that the occupant can move to the left side door. To prevent collision.

Therefore, in the first embodiment, the pad 15 is composed of the pad body 15a and the insert member 15b insert-molded on the pad body 15a.
Since the entire area of the pad 15 from the inner surface of the seat to the outer surface of the seat corresponding to the airbag unit 21 is provided with the breaking boundary surface portion 16 extending inward and outward of the seat between the pad body 15a and the insert member 15b,
The pad body 15a and the insert member 15b are in a state of being joined by insert molding at the breaking boundary 16 and the breaking boundary 16 is
Even if it is provided in the entire region from the seat inner surface to the seat outer surface, when the occupant sits on the seat 1, the pad 15 does not undergo abnormal deformation,
Its cushioning properties are well maintained. On the other hand, pad 1
When the airbag 24 receives the deployment pressure of the airbag 24, the airbag 2 easily expands and breaks at the breaking boundary 16 thereof.
4 can be reliably deployed from the fixed position of the pad 15 to the outside of the seat back 3. Therefore, the deployability of the airbag 24 can be stabilized with a simple configuration while improving the sitting comfort of the occupant.

Further, on the inner surface of the pad of the pad 15 corresponding to the breaking interface 16 between the pad body 15a and the insert member 15b, there is provided a starting point portion at which the pad 15 starts to break under the deployment pressure of the airbag 24. Cut groove 33
Are provided substantially at the same height and substantially the same length as the module can 22 along the longitudinal direction of the airbag unit 21, so that the pad 15 can be surely expanded from the cut groove 33. The pad 15 can be opened and ruptured, and the rupture of the pad 15 can be effectively guided from the cut groove 33 to the boundary surface 16 for rupture. Moreover, the pad 15 can be expanded and broken substantially in synchronization with the longitudinal direction of the airbag unit 21, and the entire airbag 24 can be deployed outside the seat back 3 almost simultaneously in the vertical direction. . Since the depth of the cut groove 33 is set to be very small with respect to the thickness of the pad 15 at that location, the cushioning property of the pad 15 is hardly affected. Therefore, it is possible to further improve the deployment stability of the airbag 24 while maintaining good occupant sitting comfort.

Further, since the insert member 15b is made of a pad material having a hardness higher than that of the pad body 15a, the cushioning properties of the pad 15 can be further improved, and the air bubbles in the insert member 15b are reduced, so that the pad body Assimilation with 15a can be further prevented. Therefore, the deployability of the airbag 24 can be further stabilized while further improving the cushioning properties of the pad 15.

Further, since the airbag unit 21 is disposed in the left side support portion 3a of the seat back 3, the airbag 24 can be easily formed between the occupant and the left side door by a side collision to the left side of the vehicle. The vehicle can be reliably prevented from colliding with the left side door. In addition, a relatively large space can be provided in the side support portion 3a of the seat back 3. Therefore, the airbag unit 21 can be accommodated in the seat 1 without hindering the sitting comfort of the occupant, and the occupant can be further made safer in a side collision.

(Embodiment 2) FIG. 4 shows Embodiment 2 of the present invention (in the following embodiments, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. Only the different parts will be described), and the position of the breaking boundary surface portion 16 of the pad body 15a and the insert member 15b extending in the inward and outward directions of the sheet and the configuration of the pad expansion starting point setting portion are different from those of the first embodiment. It is.

That is, in this embodiment, the insert member 15b is provided only on the outer surface of the pad 15 and the pad body 15a and the insert member 15b are provided on the outer surface of the pad 15 corresponding to the airbag unit 21. Boundary 1 for the sheet extending in and out of the sheet
6 are provided. In addition, a pad separating portion 34 is provided on the inner surface of the pad 15 corresponding to the boundary surface 16 for breaking, as a pad expansion starting point setting portion, which is formed by separating the inner surface of the pad 15 by a predetermined depth. As in the case of the cut groove 33 in the first embodiment, the cut portion 34 is made more fragile than the other portions, and the pad 15 is moved from the cut portion 34 by the deployment pressure of the airbag 24.
Is designed to break open. The breaking boundary surface section 16 and the pad separation section 34 are arranged substantially in a straight line, and the depth of the pad separation section 34 is very small with respect to the thickness of the pad 15 at that location. The pad body 15a is continuously connected between the bottom of the pad separating portion 34 and the inside of the sheet of the boundary surface portion 16 for breakage.

Then, when receiving the deployment pressure of the airbag 24, the airbag 24 breaks from the bottom of the pad separating portion 34 on a substantially extended line thereof. At this time, even if the rupture deviates from the extension of the pad separating portion 34, the rupture boundary surface portion 16 that is easily ruptured is provided on the outer surface of the sheet. The break path is modified to break at 16 and the airbag 24 is always
Will be developed in the direction in which.

Therefore, in the second embodiment, even if the rupture boundary 16 is provided only on the outer surface of the seat, the airbag 24 is reliably deployed from the fixed position of the pad 15 to the outside of the seat back 3. Can be done.
Since the insert member 15b is provided only on the outer surface of the seat, the cushioning properties of the pad 15 can be further improved as compared with those of the first embodiment.
Therefore, the seating comfort of the occupant of the seat 1 can be further favorably maintained.

In the second embodiment, the breaking interface 16 is provided on the outer surface of the seat.
6 may be provided on any of the sheet inner surface portion and the center portion.

In each of the above embodiments, the cut groove 33 and the pad separation portion 34 are provided as the pad expansion starting point setting portion. However, the present invention can be applied without these, and the breakage can be achieved. The pad 15 can be broken at the interface 16 for use.

Further, in each of the above embodiments, the airbag unit 21 is provided in the left side support portion 3a of the seat back 3, but the air bag unit 21 may be provided in the right side support portion 3a of the seat back 3. The invention can be applied, and collision between occupants can be prevented. And the side support part 2 of the seat cushion 2
a, the opening of the module can 22 is directed substantially upward, and the airbag unit
Is arranged so as to be deployed substantially above the seat cushion 2, the side support portion 3 a of the seat back 3 is also provided.
The present invention can be applied in the same manner as in the case of arranging inside. Further, also in a case where side support portions are provided on both left and right sides of the headrest 4, and a small airbag unit is disposed on the side support portions so that the airbag is deployed substantially forward, thereby protecting the occupant's head and the like. The present invention can be applied.

[0054]

As described above, according to the first aspect of the present invention, there is provided an energy absorbing structure for a vehicle side portion provided with an airbag unit disposed inside a pad near a side portion in a seat. On the other hand, at least a part of the pad from the inner surface of the seat to the outer surface of the seat corresponding to the airbag unit is provided with a breaking boundary portion extending in the sheet inward and outward directions of the pad body and the insert member, and the breaking boundary surface portion is provided. The pad is designed to expand and break under the airbag deployment pressure, so it is possible to improve the deployment stability of the airbag while maintaining good occupant comfort with a simple configuration. it can.

According to the second aspect of the present invention, the starting portion of the pad on which the pad begins to expand and break due to the deployment pressure of the airbag is provided on the inner surface of the seat corresponding to the breaking boundary between the pad body and the insert member. By providing the pad expansion starting point setting portion, the deployability of the airbag can be further stabilized.

According to the third aspect of the present invention, the airbag unit is configured so that the airbag is deployed in a direction substantially perpendicular to the longitudinal direction of the airbag unit. The airbag is provided over a predetermined length substantially along the length of the airbag, so that the deployability of the airbag can be further improved.

According to the fourth aspect of the present invention, the pad expansion starting point setting section is a cut groove formed by cutting the surface of the pad with a predetermined width and a predetermined depth, so that a simple pad expansion starting point setting section can be provided. A specific configuration can be easily obtained.

According to the fifth aspect of the present invention, the same effect as that of the fourth aspect of the invention can be obtained by forming the pad spreading starting point setting portion as a pad separating portion formed by cutting the surface of the pad to a predetermined depth. Can be

According to the sixth aspect of the present invention, since the insert member is made of a pad material, it is possible to further improve the sitting comfort of the occupant.

According to the seventh aspect of the present invention, the hardness of the insert member is different from that of the pad body, so that the cushioning property of the pad is improved and the deployment stability of the airbag is improved. it can.

According to the eighth aspect of the present invention, the hardness of the insert member is set to be larger than that of the pad body.
The operation and effect of the invention of claim 7 can be further promoted.

According to the ninth aspect of the present invention, the airbag unit is disposed on the side of the seat on the side door side close to the seat, so that the safety of the occupant in a side collision can be further improved. it can.

According to the tenth aspect of the present invention, the airbag unit is disposed in the seat back so that the air bag is deployed substantially in front of the seat back, so that the occupant can maintain good sitting comfort. In addition, the airbag unit can be accommodated in the seat.

According to the eleventh aspect of the present invention, the airbag unit is disposed in the seat cushion so that the airbag is deployed substantially above the seat cushion, so that the same operation as the tenth aspect of the present invention is achieved. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 2;

FIG. 2 is a perspective view showing a seat in a vehicle side energy absorbing structure according to Embodiment 1 of the present invention.

FIG. 3 is a side view showing a left portion of the seat.

FIG. 4 is a diagram corresponding to FIG. 1 in a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 3a Side support part 15 Pad 15a Pad main body 15b Insert member 16 Boundary surface part 21 Airbag unit 24 Airbag 33 Cut groove part (pad expansion starting point setting part) 34 Pad separation part (pad) Expansion start point setting section)

Claims (11)

[Claims] 1. An energy absorbing structure for a vehicle side portion having an airbag to be deployed and having an airbag unit disposed in a predetermined direction inside a pad near a side portion in a seat, The pad includes a pad body and an insert member that is insert-molded into the pad body. At least a part of the pad from the seat inner surface to the seat outer surface corresponding to the airbag unit,
A breaking boundary portion extending in the sheet inner and outer directions of the pad body and the insert member is provided, and the pad is configured to expand and break by receiving the deployment pressure of the airbag at the breaking boundary portion. Characteristic energy absorption structure on the side of the vehicle. 2. An energy absorbing structure for a vehicle side according to claim 1, wherein the pad receives a deployment pressure of an airbag on a seat inner surface of the pad corresponding to a breaking boundary between the pad body and the insert member. An energy absorption structure for a vehicle side portion, wherein a pad expansion start point setting portion is provided as a start point portion of the vehicle to start expanding and breaking. 3. The vehicle side energy absorbing structure according to claim 2, wherein the airbag unit is configured to deploy the airbag in a direction substantially orthogonal to a longitudinal direction of the airbag unit. An energy absorbing structure for a vehicle side portion, which is provided over a predetermined length substantially along a longitudinal direction of the airbag unit. 4. The energy absorbing structure for a vehicle side portion according to claim 2, wherein the pad expanding start point setting portion is a cut groove formed by cutting a surface of the pad with a predetermined width and a predetermined depth. Characteristic energy absorption structure on the side of the vehicle. 5. The energy absorbing structure for a vehicle side part according to claim 2, wherein the pad spreading starting point setting part is a pad separating part formed by separating a surface of the pad by a predetermined depth. Energy absorption structure on the side of the vehicle. 6. The energy absorbing structure for a vehicle side portion according to claim 1, wherein the insert member is made of a pad material. 7. The energy absorbing structure for a vehicle side part according to claim 6, wherein the hardness of the insert member is different from that of the pad body. 8. The energy absorbing structure for a vehicle side part according to claim 7, wherein the hardness of the insert member is set to be higher than that of the pad body. 9. The energy absorbing structure for a vehicle side portion according to claim 1, wherein the airbag unit is disposed on a side portion of the seat on a side door side close to the seat. Characteristic energy absorption structure on the side of the vehicle. 10. The energy absorbing structure for a vehicle side portion according to claim 9, wherein the airbag unit is disposed in the seatback such that the airbag is deployed substantially in front of the seatback. Characteristic energy absorption structure on the side of the vehicle. 11. The vehicle side energy absorbing structure according to claim 9, wherein the airbag unit is provided in the seat cushion such that the airbag is deployed substantially above the seat cushion. Characteristic energy absorption structure on the side of the vehicle.