JP2007022269A - Protective bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective bag effectively protecting an occupant by appropriately restraining the waist of the occupant. <P>SOLUTION: The protective bag is deployed from a door trim 36 toward the waist part L of the occupant P by providing liquid 41 in case of the side collision of a vehicle in order to protect the occupant P by restricting the waist L of the occupant P sitting on a seat 11 of the vehicle. The protection bag 31 is disposed at the side of the waist L of the occupant P, and is preferably deployed toward the waist L of the occupant P in case of a side collision of the vehicle. The protection bag 31 restricts the waist L of the occupant P at the rear part of a pelvis 111 around the iliac bone in the skeleton of the occupant P sitting on the seat 11 of the vehicle. The protection bag 31 preferably abuts on the waist L of the occupant P from the obliquely rear part of the occupant P, and abuts on the waist L of the occupant P in the obliquely inclined state to be located in the inner side of the vehicle as rear side with respect to the forward direction of the vehicle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a protective bag for protecting an occupant seated on a vehicle seat in a side collision of the vehicle.

For example, Patent Literature 1 discloses a side airbag device for protecting an occupant seated on a vehicle seat at the time of a side collision of the vehicle.
JP 2003-335210 A

  The inventors of the present invention have intensively studied a method for protecting a passenger by establishing a strategy different from that for protecting the passenger by the conventional side airbag device. As a result, when protecting the side of the occupant seated in the vehicle seat, various simulations were performed focusing on the skeleton of the occupant in the sitting position. It has been found that the most effective protection is possible by restraining the occupant's waist. And based on these knowledge, it came to complete this invention.

  An object of the present invention is to provide a protective bag capable of effectively protecting the occupant by appropriately restraining the waist of the occupant.

  In order to achieve the above object, the invention according to claim 1 is a protective bag for protecting the occupant by restraining the lumbar portion of the occupant seated on the vehicle seat at the time of a side collision of the vehicle. Is provided with an inner trim disposed on the side of the occupant, and the protective bag expands from the inner trim toward the occupant's waist by allowing fluid to flow in when the vehicle collides. The gist.

  According to this configuration, the protective bag is unfolded from the inner trim such as the door trim toward the occupant's waist when the vehicle collides. Since the inner trim is disposed in the vicinity of the occupant seated on the vehicle seat, the protective bag facilitates quick protection of the occupant. Further, since the inner trim is disposed on the side of the occupant, the protective bag is deployed in a direction substantially coincident with the direction of collision of another vehicle or the like with the vehicle equipped with the protective bag. For this reason, a protective bag expand | deploys appropriately between a passenger | crew and said another vehicle etc., and absorbs the impact added by this another vehicle etc. effectively. Accordingly, the occupant's lower back is appropriately restrained when the vehicle collides, and as a result, the occupant is effectively protected.

The gist of the protective bag according to claim 2 is that, in the invention according to claim 1, the fluid is a liquid.
According to this configuration, the surface of the protective bag that is deployed by the inflow of liquid has a high followability to a complicated shape such as a human body, and therefore the load applied to the occupant during a side collision of the vehicle is reduced. Disperse properly along the waist. Accordingly, the occupant's lower back is appropriately restrained when the vehicle collides, and as a result, the occupant is effectively protected.

  The protective bag according to claim 3 is the invention according to claim 1 or claim 2, wherein the protective bag is arranged on a side of the waist of the occupant and the waist of the occupant during a side collision of the vehicle. The main point is to expand the side to the side.

  According to this structure, since the protective bag is arrange | positioned at the side of a passenger | crew's waist | hip | lumbar part, it expand | deploys so that an inner trim and a passenger | crew's waist | hip | lumbar part may be connected by the shortest distance. Therefore, the passenger can be quickly protected by the protective bag.

  The protective bag according to claim 4 is the invention according to claim 1 or claim 2, wherein an armrest projects from the inner trim, and the protective bag is disposed at a base end portion of the armrest, and The gist is to deploy the vehicle from the lower part of the armrest toward the occupant's waist during a side collision of the vehicle.

  According to this configuration, since the protective bag is deployed so as to fill a space below the armrest, interference between the armrest and the occupant can be easily suppressed. Furthermore, since there are few obstacles that hinder the deployment of the protective bag in the space below the armrest, the protective bag is smoothly deployed.

  The protective bag according to claim 5 is the invention according to any one of claims 1 to 4, wherein the protective bag is a skeleton of the occupant seated on the seat of the vehicle. The gist is to restrain the occupant's lower back at a site corresponding to the rear pelvis.

  The protective bag according to claim 6 corresponds to the iliac bone in the skeleton of the occupant seated on the seat of the vehicle in the invention according to any one of claims 1 to 4. The gist is to restrain the lumbar portion of the occupant at the part to be operated.

  When the occupant receives inertial force in the vehicle width direction at the time of a side collision of the vehicle, the occupant's waist moves, for example, toward an inner wall such as an inner trim that defines a side portion of the passenger compartment. Further, when the vehicle collides, the inner wall may move toward the occupant's waist. When the occupant's waist is in contact with the inner wall or the like and is pressed toward the inside of the passenger compartment, a load corresponding to the pressing force exerted from the inner wall or the like is input to the occupant's waist.

  On the other hand, in an occupant in a posture sitting on the seat of the vehicle, the greater trochanter extending to protrude outward at the upper end of the femur and the pubic bone constituting the front of the pelvis are respectively provided at the front of the waist It is arranged so as to extend substantially in the vehicle width direction. In addition, a part of the iliac that constitutes the rear surface of the pelvis is arranged at the rear part of the lumbar part so as to extend substantially in the vehicle width direction. The tip of the greater trochanter protrudes outward from the side edge of the iliac, and the minimum value of the cross-sectional area of the pubic bone extending in the vehicle width direction is about one third of the minimum value of the cross-sectional area of the iliac extending in the same direction. There is only.

  For this reason, when the side surface of the lumbar portion of the occupant is pressed against the inner wall or the like, it is pressed at the rear part of the pelvis centered on the iliac rather than being pressed at the site corresponding to the greater trochanter. It has a structure that can withstand the input of a larger load. That is, when the load is input to the rear part of the pelvis, the load is received in a wider area than when the load is input to the site corresponding to the greater trochanter. Therefore, for example, when loads of the same magnitude are input, regarding the cross section of the bone orthogonal to the input direction of the load, the magnitude of the load input per unit area is lower in the iliac than in the pubic bone, The entire iliac bone can receive the load with lower stress.

  Therefore, the protective bag according to claim 5 restrains the occupant's lumbar region at a portion corresponding to the pelvis behind the acetabulum in the skeleton of the occupant seated on the vehicle seat at the time of a side collision of the vehicle. The load applied to the occupant's waist can be received with lower stress than when restrained at the front of the waist. Therefore, since the occupant's waist is appropriately restrained in a form suitable for the occupant's lumbar skeleton, it is possible to effectively protect the occupant.

  The protective bag according to claim 6 is restrained at the front part of the lumbar part in order to restrain the lumbar part of the occupant at the portion corresponding to the iliac in the skeleton of the occupant seated on the vehicle seat at the time of a side collision of the vehicle. Compared to the case, the load applied to the occupant's lower back can be received with lower stress. Therefore, since the occupant's waist is appropriately restrained in a form suitable for the occupant's lumbar skeleton, it is possible to effectively protect the occupant.

  The protective bag according to claim 7 is the invention according to any one of claims 1 to 6, wherein the protective bag is placed from an obliquely rearward side of the occupant to a waist portion of the occupant during a side collision of the vehicle. The gist is to abut.

  The protective bag according to claim 8 is the invention according to any one of claims 1 to 7, wherein the protective bag is further toward the rear in the forward direction of the vehicle at the time of a side collision of the vehicle. The gist of the invention is to abut against the occupant's lower back portion in an obliquely inclined state so as to be located on the passenger compartment side.

  According to the seventh and eighth aspects of the present invention, the occupant's lower back is a portion corresponding to a wide range of the outer surface of the rear part of the pelvis centered on the iliac bone, and the load from the protective bag is reduced. Receive input. As a result, the load is transmitted while being distributed over a wide range of the posterior part of the pelvis centered on the iliac bone, so that high protection performance for the occupant is exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, the protective bag which can aim at the protection with respect to this passenger | crew effectively by restraining a passenger | crew's waist | hip | lumbar part appropriately can be provided.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying a protective bag of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a skeleton in the vicinity of the pelvis of a human body, and corresponds to, for example, a perspective view of the vicinity of a pelvis 111 (pelvis) of an occupant seated on a driver's seat of a vehicle as seen from the vicinity of a steering wheel. To do. FIG. 2A is a perspective view showing the skeleton in the vicinity of the human pelvis 111 from the diagonally left rear.

  As shown in FIGS. 1 and 2A, the pelvis 111 is a ring-shaped bone between the spine and the lower limbs, and has a tough structure that supports the weight of the head, upper limbs, and trunk. The pelvis 111 is made thicker and thicker than the walls of the cranial cavity and the chest cavity, and includes two hip bones 112 that form the side surface and the front surface of the pelvis 111 and a sacrum 113 that forms the posterior wall. And the tailbone 114 (coccyx).

  The hipbone 112 occupies most of the pelvis 111 and has a relatively flat but irregular shape. Each hipbone 112 is constituted by unioning three bones of an iliac bone 121 (ilium), a sciatic bone 122 (ischium), and a pubic bone 123 (pubis). The fusion occurs around a cup-shaped joint cavity called acetabulum 125 (see Fig. 3) in which the head 171 of the femur 170 fits and at both ends of each bone.

  The iliac bone 121 is a portion that forms the side surface of the acetabulum 112 and extends so as to expand widely from the acetabulum 125 upward. The iliac 121 is divided into two parts, a large winged iliac wing (ala ossis ilium) and an iliac body 126 that includes a portion of the acetabulum 125 (see body of the ilium, see FIG. 3). The upper anterior portion of the iliac wing is the upper anterior iliac spine, the lower anterior portion is the lower anterior iliac spine, and the upper posterior portion is the superior-superior iliac spine 127. spine), the lower posterior portion is called the lower posterior iliac spine. The iliac bone 121 is firmly connected to the sacrum 113 on the inner surface called an auricular surface 128 (auricular surface).

  The ear-like surface 128 of the sacrum 113 and the ear-like surface 128 of the iliac 121 form a sacroiliac joint 129 (articulatio sacroiliaca, see FIG. 2A). The joint surface of the sacroiliac joint 129 has a narrow joint space that contains synovial fluid and is covered with cartilage. The sacroiliac joint 129 is a joint that exhibits little mobility, but has a characteristic structure that the joint surface has irregularities and is surrounded by a plurality of strong ligaments, Allow limited relative movement between sacrum 113 and iliac 121. That is, as shown in FIGS. 2A and 2B, the sacroiliac joint 129 allows the sacrum 113 to move such that each iliac bone 121 rotates in the front-rear direction.

  The sciatica 122 forms the lower posterior site of the hipbone 112 and is divided into a body of ischium and a sciatic branch 141 (ramus of ischium). The sciatic body constitutes the back third of the acetabulum 125. The lower part of the sciatic body is an ischial tuberosity, and supports the trunk of the occupant P in the sitting posture. The sciatic branch 141 is a part that connects a thin flat sciatic bone to the pubic branch 151.

  The pubic bone 123 is a bone having an irregular shape composed of the pubic body 152 (see FIG. 3) and the pubic branch 151. The pubic body 152 constitutes the anterior third of the acetabulum 125. The pubic branch 151 includes an upper pubic branch 151a and a lower pubic branch 151b. The suprapubic branch 151a extends from the pubic body 152 to the median sagittal plane and is articulated with the corresponding suprapubic branch 151a on the opposite side. This joint is called a pubic symphysis 153 and includes a cartilage plate, so that it can move slightly. The subpubic branch 151b is combined with the sciatic branch 141 to form a bottom arch of an obturator foramen. The lower pubic branch 151b is also connected to the lower pubic branch 151b on the opposite side by the pubic joint 153, similarly to the upper pubic branch 151a.

  A femoral head 171 and a greater trochanter 172 extending laterally from the femoral head 171 exist at the upper end of each femur 170. As shown in FIG. 1, the tip of the greater trochanter 172 usually protrudes slightly toward the outside of the body from the side end of the pelvis 111. Further, as shown in FIG. 3, the left and right iliac bones 121 located at the same height as the greater trochanter 172 have the acetabulum 125 located on the outermost side, and the upper posterior iliac spine 127 or the lower posterior intestine. It is formed in a taper shape that narrows toward the rear so that the portion of the osteophyte is located on the innermost side. That is, in the lumbar skeleton located at the same height as the greater trochanter 172, the greater trochanter 172 is the bone that is disposed most outside the body.

  FIG. 3 is a plan sectional view schematically showing the waist L of the occupant P in a posture seated on the seat 11 a of the vehicle seat 11. As illustrated, an inner side wall 13 (for example, a side surface of an inner trim such as a door trim) that divides a side portion of the passenger compartment is disposed on the side of the seat 11. Similar to the seat 11 and the occupant P, the inner wall 13 is arranged to extend in the front-rear direction of the vehicle.

  Now, when the vehicle collides, the occupant P receives an inertial force in the vehicle width direction, that is, toward the inner wall 13 side. Furthermore, when another vehicle or the like collides with the outside of the inner wall 13 (the outer surface of the body such as a side door), the inner wall 13 may bulge so as to approach the passenger P. . In such a case, the waist L of the occupant P directly abuts against the inner side wall 13 or indirectly via a side airbag or the like.

  The present inventors have conducted computer-aided engineering analysis (CAE analysis) on the relationship between the load applied to the occupant P in a posture seated on the seat 11 and the skeleton of the occupant P during the side impact of the vehicle. A simulation was performed. As a result, the conventional technique in which the waist L of the occupant P abuts against the inner wall 13 from the side (the lumbar L of the occupant P abuts the inner wall 13 on a plane parallel to the inner wall 13 shown in FIG. 3). In such a case, the load input from the inner wall 13 to the occupant P showed a distribution with a characteristic bias in the skeleton of the occupant P. In particular, the input of the initial load to the greater trochanter 172 located outside the body of the occupant P tended to concentrate directly on the pubic bone 123 having a small cross-sectional area. Accordingly, such load inputs are dispersed and equalized in the widest possible range in time and space, or the load distribution is selectively biased to a portion having high resistance to the load input. It is desirable to

  Here, as shown in FIG. 1, a pubic bone 123 composed of an upper pubic branch 151 a and a lower pubic branch 151 b is arranged inside the greater trochanter 172 so as to extend substantially in the vehicle width direction. Further, at the rear part of the pelvis 111, there is an ear-like surface 128 of the iliac 121 extending substantially along the vehicle width direction. The vicinity of the ear-shaped surface 128 has the smallest cross-sectional area of the bone extending along the vehicle width direction at the rear portion of the pelvis 111. However, the sum of the cross-sectional area S1 of the upper pubic branch 151a and the cross-sectional area S2 of the lower pubic branch 151b is only about one third of the cross-sectional area S3 of the iliac 121 near the ear-like surface 128.

  In the CAE analysis, the present inventors specifically simulated the change in stress exhibited by the pelvis 111 when the load shown in FIG. FIG. 4A is a graph simulating changes in the load applied to the pelvis 111 when an equivalent load is input to the front part (pubic side) and the rear part (sacral side) of the pelvis 111, respectively. b) is a graph showing the time change of the stress indicated by the pelvis 111;

  As shown in FIG. 4B, the stress at the front part (pubic side) of the pelvis 111 was larger than the stress at the rear part (sacral side) despite the input of an equivalent load. According to the result of CAE analysis under a specific condition (for example, the condition that the occupant P is set to the standard physique of an American male), the cross-sectional areas at the front part (pubic side) and the rear part (sacral side) of the pelvis 111 The stress at the front part (pubic side) of the pelvis 111 was about three times as large as the stress at the rear part (sacral side) so as to be almost inversely proportional to the difference. That is, from the viewpoint of effectively protecting the occupant P, inputting a large load to the pubic bone 123 via the greater trochanter 172 in the lumbar L of the occupant P causes an extreme bias in stress. Not very desirable. Preferably, the load input to the front part (pubic bone side) of the pelvis 111 is smaller than the load input to the rear part (sacral side). By the way, most preferably in the above specific condition, the load input to the front part (pubic side) of the pelvis 111 is about one third of the load input to the rear part (sacrum side).

  In order to achieve such a desired load input, it is preferable to provide an impact absorbing member 21 as shown in FIG. 3 on the side of the waist L of the occupant P seated on the vehicle seat 11. FIG. 3 shows only a part of the shock absorbing member 21. The shock absorbing member 21 is made of a material having a shock absorbing action, and includes a tapered surface 23 that comes into contact with the waist L of the occupant P. As shown by a two-dot chain line in FIG. 3, the shock absorbing member 21 is disposed at a predetermined distance from the waist L of the occupant P instead of the tapered surface 23 that contacts the waist L of the occupant P. The taper surface 23a may be provided.

  The tapered surfaces 23, 23 a are on the side of the lumbar portion L of the occupant P at the rear portion of the pelvis 111 centered on the iliac 121, specifically at the site corresponding to the pelvis 111 behind the acetabulum 125. It arrange | positions so that it may contact | abut to the waist part L (buttock part) of P. FIG. Incidentally, the portion corresponding to the pelvis 111 behind the acetabulum 125 does not include the acetabulum 125 itself. Further, the tapered surfaces 23, 23 a are preferably arranged so as to be able to come into contact with the waist L of the occupant P on the side of the iliac bone 121, the sacrum 113, and the ischial bone 122, and correspond to the iliac bone 121. It is particularly preferable that the parts are arranged so as to be able to contact the waist L of the occupant P at the site. The tapered surfaces 23 and 23 a are preferably formed along the rear part of the pelvis 111 around the iliac bone 121, specifically, along the pelvis 111 behind the acetabulum 125. It is particularly preferable that it is formed so as to extend along.

  Such tapered surfaces 23, 23a are preferably formed by surfaces inclined at a predetermined angle with respect to the inner side wall 13 so as to protrude toward the passenger compartment side in the forward direction of the vehicle. Further, the taper surfaces 23 and 23a protrude in the vehicle interior toward the rear and are curved along the outer side of the iliac bone 121 that forms a part of a substantially bowl-shaped shape, for example, such that the central portion is recessed in an arc shape. It is particularly preferable that the curved surface is formed. Furthermore, it is preferable that the taper surfaces 23 and 23a are formed so as to protrude downward into the vehicle interior with respect to the vertical direction of the vehicle, and protrude downward into the vehicle interior as well as downward so that the central portion is recessed in an arc shape. It is particularly preferred that it is formed. Such a tapered surface 23, 23a abuts against the waist L of the occupant P (the buttock, in particular, the buttock near the center of the greater gluteal muscle) during a side collision of the vehicle, and the lumbar L of the occupant P toward the passenger compartment. , The waist L is restrained so as not to move outside the vehicle from the tapered surfaces 23 and 23a. At this time, the taper surfaces 23 and 23a restrain the occupant P's waist L at the rear part of the pelvis 111 around the iliac bone 121 in the skeleton of the occupant P seated on the seat 11 of the vehicle. Demonstrate the protection performance against.

  As described above, the rear part of the pelvis 111 centered on the iliac bone 121 has a skeleton that is stronger than the portion corresponding to the greater trochanter 172 with respect to the load in the vehicle width direction. Further, in this case, since the greater gluteal muscle is thickest in the rear part of the pelvis 111, a high shock absorbing effect by the greater gluteal muscle is exhibited before the load is transmitted to the iliac bone 121. For this reason, for example, when the tapered surfaces 23 and 23a abut against the waist L of the occupant P at the rear of the pelvis 111 centered on the iliac 121 and restrain the occupant P under the specific conditions described above, the greater trochanter It should be possible to withstand an input of a load that is three times higher than in the case of abutting at a portion corresponding to 172. Therefore, the protection performance with respect to the passenger | crew P can be improved further.

  Furthermore, it is preferable that the taper surfaces 23 and 23a first contact (contact) with the rear portion (hip portion) of the pelvis 111 centered on the iliac bone 121 in the waist L of the occupant P. At this time, since the load applied to the pubic bone 123 is greatly reduced as compared with the case where the tapered surfaces 23 and 23a first contact the portion corresponding to the greater trochanter 172, the protection performance for the occupant P is easy. Can be increased. Moreover, it is preferable that the impact absorbing member 21 including the tapered surfaces 23 and 23a abut on the waist L of the occupant P from an oblique rear side of the occupant P. At this time, the tapered surfaces 23, 23 a can transmit the load simultaneously over a wide range of the outer surface of the rear part of the pelvis 111 centering on the iliac bone 121. As a result, since the load is transmitted while being distributed over a wide range of the rear part of the pelvis 111, high protection performance for the occupant P is exhibited.

  Furthermore, the present inventors performed a simulation by CAE analysis as to which part of the pelvis 111 centered on the iliac 121 can be protected most effectively by biasing the input of the load. As a result, when the tapered surfaces 23 and 23a come into contact with the upper end portion of the iliac 121 (the iliac wings above the ear-shaped surface 128), the load input to the occupant P from the tapered surfaces 23 and 23a. However, in the skeleton of the occupant P, the distribution showed a characteristic bias. That is, the load input from the tapered surfaces 23 and 23a acts on the iliac bone 121 with the sacroiliac joint 129 as a fulcrum to rotate the iliac bone 121 forward relative to the sacrum 113 about the sacroiliac joint 129. A rotational moment as a point was generated. This rotational moment acts from the front end portion of the iliac 121 to the pubic bone 123, but does not act in a direction coinciding with the movement of the pubic bone 123 that is movable around the pubic joint 153. For this reason, the said rotation moment was converted into the bending moment with respect to the pubic bone 123 which has a small cross-sectional area, and the tendency which concentrates on the pubic bone 123 directly was seen. Therefore, it is desirable to selectively bias the load distribution to a portion having high resistance to such load input.

  From this point of view, the tapered surfaces 23 and 23a are located in the skeleton of the occupant P at a site below the sacroiliac joint 129 (the ear-shaped surface 128) in the vertical direction of the pelvis 111 of the occupant P seated on the seat 11. It is preferable that the occupant P is disposed so as to be able to contact the waist L of the passenger P. In this case, for example, the tapered surfaces 23, 23 a can come into contact with the waist L of the occupant P at the side of the sciatic bone 122, the sacrum 113, and the iliac bone 121 (ie, the iliac body 126) below the sacroiliac joint 129. It is arranged to become.

  Furthermore, it is preferable that the taper surfaces 23 and 23 a are arranged so as to input a load toward the sacroiliac joint 129. In this case, for example, the tapered surfaces 23, 23 a are arranged obliquely behind and slightly below the iliac 121, and are configured by a plane perpendicular to the direction from the position toward the sacroiliac joint 129. Further, the tapered surfaces 23 and 23a are arranged obliquely behind and slightly below the iliac 121, and are configured by saddle-shaped curved surfaces extending from the position so as to surround the sacroiliac joint 129 at substantially equal distances. Is also possible. The tapered surfaces 23, 23 a in such a manner can input a load toward the sacroiliac joint 129 from a slightly lower side of the iliac bone 121 in the skeleton of the occupant P.

  In order to protect the occupant P in such a desirable form, the present embodiment employs a configuration in which a protective bag 31 as shown in FIGS. 5A and 5B is provided. The protective bag 31 is formed in a bag shape by a cloth or a film.

  As shown in FIG. 6A, a side door 32 is provided on the vehicle exterior side of the vehicle seat 11. A side door window 33 is provided on the upper side of the side door 32. As shown in FIGS. 6A and 6B, a side door outer panel 34 as a side outer panel, a side inner panel is provided at the lower portion of the side door 32 in order from the vehicle outer side to the passenger compartment side in the vehicle width direction. A side door inner panel 35 and a door trim 36 as an inner trim are provided. The side door outer panel 34 and the side door inner panel 35 are made of a steel plate, and the door trim 36 is mainly made of a resin plate.

  Between the side door outer panel 34 and the side door inner panel 35, an aluminum liquid tank 42 in which a nonflammable liquid 41 is sealed is provided. Here, it is preferable that the liquid 41 is an incompressible fluid and has a low viscosity and a high boiling point. The liquid tank 42 is located substantially at the center of the side door outer panel 34 in the vertical direction. The liquid tank 42 is disposed along the back surface of the side door outer panel 34 and can be deformed so as to follow the deformation of the side door outer panel 34 when the vehicle collides. A circular hole 43 is provided at a substantially central portion in the vertical direction of the side door inner panel 35. A fixing portion 44 of the liquid tank 42 is fixed to the circular hole 43.

  The fixed portion 44 includes an annular tapered portion 44a formed in a tapered shape that narrows toward the passenger compartment side with steel, and a fracture portion 44b provided at the tip of the annular tapered portion 44a. The annular taper portion 44a is provided for directing the liquid 41 in the liquid tank 42 so that the liquid 41 flows out sideward (substantially beside) from the side door inner panel 35 toward the passenger compartment. As shown in FIG. 7B, the breaking portion 44b can be broken by an increase in the pressure in the liquid tank.

  As shown in FIG. 6B, a fixing bracket 46 for fixing the base end portion of the protective bag 31 is provided on the vehicle compartment side of the circular hole 43. The fixing bracket 46 is formed in an annular shape having an opening hole 46 a opened along the circular hole 43. On the vehicle compartment side of the opening hole 46a, a base end portion of the protective bag 31 is fixed, and an accommodation recess 46b for accommodating the folded protection bag 31 is provided. The housing recess 46b is formed in a tapered shape that widens toward the tip side.

  A notch 47 is provided on the back surface (the vehicle outer surface) of the door trim 36 located on the side of the fixed bracket 46. As shown in FIG. 7B, the notch 47 is broken and deformed to form an opening 47a when the protective bag 31 is deployed on the vehicle compartment side. As shown in FIG. 6A, the fixing bracket 46 is disposed below the armrest 48 projecting substantially at the center in the vertical direction of the door trim 36, and the upper surface of the seat 11a of the seat 11. It is arranged above. For this reason, the waist portion L of the occupant P seated on the seat 11 is located on the side (substantially beside) of the fixed bracket 46.

Next, the operation of the protective bag 31 will be described.
In the vehicle of this embodiment, when another vehicle or the like collides from the direction indicated by the thick arrow A in FIG. 5A, the side door outer panel 34 is recessed toward the passenger compartment as shown in FIG. . At this time, the liquid tank 42 is deformed and crushed so as to follow the deformation of the side door outer panel 34. As a result, the pressure in the liquid tank 42 increases, and the liquid 41 in the liquid tank 42 flows into the protective bag 31 by breaking the breakage portion 44b as shown in FIG. The liquid 41 flowing into the protective bag 31 is sprayed toward the inside of the folded protective bag 31 while being directed in a predetermined direction by the annular tapered portion 44a.

  Although the protective bag 31 is inflated by the inflow of the liquid 41, the protective bag 31 is regulated to be inflated toward the passenger compartment side because it is regulated by the side surface of the housing recess 46 b. When the protective bag 31 is inflated toward the passenger compartment side, the protective bag 31 breaks the notch 47 as shown in FIG. 7A while pressing the back surface of the door trim 36 toward the passenger compartment side. Then, the opening 47a is formed by deformation. Subsequently, as shown in FIGS. 5A and 5B, the protective bag 31 is guided by the side surface of the housing recess 46 b and the peripheral edge of the opening 47 a, while the passenger sits on the lower portion of the door trim 36 and the seat 11. From the door trim 36 toward the waist L of the occupant P, it is developed laterally (substantially beside) so as to connect with the waist L of the P at the shortest distance. Incidentally, the volume of the protective bag 31 when deployed to the maximum is proportional to the volume of the liquid tank 42 being crushed.

  The deployed protective bag 31 has a tapered surface 31a formed at a position where it comes into contact with the waist L of the occupant P. The tapered surface 31a is formed as follows. First, when the outer surface of the protective bag 31 comes into contact with the waist L of the occupant P, the outer surface of the protective bag 31 is centered on the portion in contact with the waist L while pressing the waist L of the occupant P toward the passenger compartment. Then, it deforms so as to follow the outer surface shape of the waist L of the occupant P. As a result, the tapered surface 31a is formed in a shape along the rear part of the waist L of the occupant P.

  The tapered surface 31 a is in contact with the waist L of the occupant P at the rear part of the pelvis 111 around the iliac bone 121 on the side of the waist L of the occupant P. Further, the tapered surface 31 a is formed so as to extend along the iliac bone 121. Further, the taper surface 31a is formed so as to protrude rearward in the vehicle interior in the forward direction of the vehicle and to have a central portion recessed in an arc shape. Furthermore, the taper surface 31a is formed so as to protrude into the vehicle interior as it goes downward in the vertical direction of the vehicle and to have a central portion recessed in an arc shape. The tapered surface 31a abuts on the waist L of the occupant P and presses the lumbar L of the occupant P toward the passenger compartment, thereby restraining the waist L from moving outside the vehicle from the tapered surface 31a. . At this time, the tapered surface 31a concentrates the load on the rear portion of the pelvis 111 centered on the iliac bone 121 in the skeleton of the occupant P seated on the vehicle seat 11, and is applied to the portion corresponding to the greater trochanter 172 Since the waist L of the occupant P is restrained so as to reduce the occupant P, high protection performance for the occupant P is exhibited.

  Further, in most cases, the tapered surface 31a of the present embodiment first abuts (contacts) with the rear portion of the pelvis 111 around the iliac bone 121 in the waist L of the occupant P. Furthermore, the protective bag 31 also enters between the waist part L of the occupant P and the backrest part 11b of the seat 11 due to its high followability, and comes into contact with the lumbar part L of the occupant P from obliquely behind the occupant P. For this reason, the taper surface 31a transmits the load while being distributed over a wide range of the outer surface of the rear part of the pelvis 111 centering on the iliac bone 121, and obliquely from behind the waist L of the occupant P. Contact and transmit the load.

  In addition, the protective bag 31 also enters between the waist portion L of the occupant P and the seat portion 11a of the seat 11 due to its high followability, and comes into contact with the waist portion L of the occupant P from obliquely below the occupant P. For this reason, the taper surface 31a abuts against the waist L of the occupant P at the site below the sacroiliac joint 129 in the skeleton of the occupant P in the vertical direction of the pelvis 111 of the occupant P seated on the seat 11. Further, at this time, since the taper surface 31a inputs a load toward the sacroiliac joint 129, in the skeleton of the occupant P, the load is input toward the sacroiliac joint 129 from slightly behind the iliac bone 121. To make it easier.

The effects exhibited by the embodiment will be described below.
-The protective bag 31 of this embodiment expand | deploys toward the waist | lumbar part L of the passenger | crew P from the door trim 36 at the time of a vehicle side collision. Since the door trim 36 is disposed at a position close to the occupant P sitting on the seat 11 of the vehicle, the protective bag 31 can quickly protect the occupant P. Further, since the door trim 36 is disposed on the side of the occupant P, the protective bag 31 expands in a direction substantially coincident with the direction of collision of another vehicle or the like with the vehicle including the protective bag 31. For this reason, the protective bag 31 can be appropriately deployed between the occupant P and the other vehicle or the like, and can effectively absorb the impact applied by the other vehicle or the like. Therefore, the waist L of the occupant P is appropriately restrained at the time of a side collision of the vehicle, and as a result, it is possible to effectively protect the occupant P.

  -The structure which expand | deploys by making the liquid 41 flow in is employ | adopted for the protective bag 31 of this embodiment. Since the surface of the protective bag 31 developed by the inflow of the liquid 41 has a high followability to a complicated shape such as a human body, a load applied to the occupant P at the time of a side collision of the vehicle is applied to the waist L of the occupant P. Can be properly dispersed along the line. Therefore, the waist L of the occupant P is appropriately restrained at the time of a side collision of the vehicle, and as a result, it is possible to effectively protect the occupant P.

  Furthermore, the protective bag 31 that is deployed by flowing the liquid 41 has a property of deploying so as to avoid the obstacle while following the outer surface of the obstacle when contacting the obstacle such as the sheet 11. For this reason, even when the position of the seat 11 in the forward direction and the vertical direction of the vehicle is changed in accordance with the physique of the occupant P, the waist L of the occupant P can be restrained at an appropriate position. Furthermore, since the protrusion amount (volume) of the protective bag 31 toward the passenger compartment is proportional to the volume of the liquid tank 42 being crushed, it is possible to exhibit protection performance according to the degree of the side collision. In addition, the liquid tank 42 can exhibit a damper function for reducing vibrations during traveling of the vehicle and when the side door 32 is opened and closed, and also functions as a heat insulating material for enhancing the heat insulation performance in the vehicle interior. obtain.

  -The protective bag 31 of this embodiment is arrange | positioned to the side (substantially beside) of the waist part L of the passenger | crew P, and expand | deploys sideward (substantially beside) toward the waist part L of the passenger | crew P at the side collision of a vehicle. That is, since the protective bag 31 is disposed on the side of the waist L of the occupant P, the protective bag 31 can be deployed so as to connect the door trim 36 and the lumbar L of the occupant P at a substantially shortest distance. Accordingly, it is possible to easily protect the occupant P with the protective bag 31 quickly. Further, since the protective bag 31 is deployed in a direction in which the waist L of the occupant P is moved sideways and escapes from the door trim 36, for example, the protective bag 31 is compared with the airbag device disclosed in Patent Document 1 that is deployed in the forward direction or the vertical direction of the vehicle. High protection performance.

  The protective bag 31 of the present embodiment restrains the lumbar L of the occupant P at the rear part of the pelvis 111 around the iliac bone 121 in the skeleton of the occupant P seated on the vehicle seat 11 at the time of a side collision of the vehicle. Therefore, as compared with the case where the occupant P is restrained at the front portion of the waist L, the load applied to the waist L of the occupant P can be received with lower stress. Therefore, since the waist L of the occupant P is appropriately restrained in a form suitable for the skeleton of the lumbar L of the occupant P, it is possible to effectively protect the occupant P.

  The protective bag 31 according to the present embodiment contacts the waist L of the occupant P from an oblique rear side of the occupant P when the vehicle collides. Moreover, the protective bag 31 of this embodiment contacts the waist | lumbar part L of the passenger | crew P in the state which inclined diagonally so that it might be located inside this vehicle so that it might be located in the inner side of this vehicle may be back in the forward direction of a vehicle at the time of a side collision of a vehicle. When such a protective bag 31 is employed, the waist L of the occupant P is a portion corresponding to a wide range of the outer surface of the rear part of the pelvis 111 centering on the iliac bone 121, and the load from the protective bag 31. Receive input. As a result, since the load is transmitted while being distributed over a wide range of the rear part of the pelvis 111 centering on the iliac bone 121, high protection performance for the occupant P can be exhibited.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
As shown in FIGS. 8A and 8B, the folded protection bag 31 is accommodated at the base end portion of the armrest 48, and the protection bag 31 is removed from the lower portion (lower surface) of the armrest 48 when the vehicle collides. You may change so that it may expand toward the waist L of the passenger | crew P. Note that a jump bracket 51 (see FIG. 8B) for orienting the protective bag 31 from the lower portion of the armrest 48 toward the waist L of the occupant P is provided at the base end of the armrest 48. It is preferable to provide it. In this case, the proximal end portion of the jump bracket 51 is fixed to the side door inner panel 35, and the distal end portion is disposed near the upper end portion of the opening 47a. In addition, since this protective bag 31 becomes easy to expand | deploy in the desired direction with dead weight, it is preferable that it is the structure expand | deployed by making the liquid 41 flow in.

  According to this configuration, since the protective bag 31 is deployed so as to fill a space below the armrest 48, it is possible to easily suppress interference between the armrest 48 and the occupant P. Furthermore, in this case, since the protective bag 31 is less likely to interfere with the chest of the occupant P, the protection performance for the chest of the occupant P can also be enhanced. In addition, this modified example is excellent in that the protective bag 31 can be smoothly deployed even in a vehicle in which there is almost no space between the backrest portion 11b of the seat 11 and the armrest 48.

  Furthermore, since there are few obstacles that hinder the deployment of the protective bag 31 in the space below the armrest 48, the protective bag 31 can be easily deployed smoothly. For example, even when the door pocket 52 is provided below the armrest 48, it is difficult to hinder the deployment of the protective bag 31 of the present modification. Further, since the protective bag 31 is disposed in a relatively wide space formed at the base end portion of the armrest 48, the protective bag 31 can be easily assembled to the vehicle.

  As shown in FIG. 9, the protective bag 31 may be changed so as to be developed by a gas as a fluid generated from the inflator 53 instead of the liquid 41. In this case, for example, a configuration in which the circular hole 43 is omitted and the inflator 53 is fixed to the side door inner panel 35 or the fixing bracket 46 is employed.

The liquid tank 42 may be divided into two chambers, and two types of liquids having a property of expanding by mixing may be changed to be separated from each other and sealed.
The protective bag 31 may be deployed from the portion of the door trim 36 positioned forward or rearward from the waist L of the occupant P toward the waist L of the occupant P in the forward direction of the vehicle. Further, the protective bag 31 may be deployed from the portion of the door trim 36 positioned below the waist L of the occupant P toward the waist L of the occupant P in the vertical direction of the vehicle.

  The protective bag 31 can be changed so as to be deployed under the control of an electronic control unit (ECU). In this case, the ECU deploys the protective bag 31 based on a detection signal from an impact sensor that detects an impact caused by a side collision of the vehicle. The protective bag 31 is developed by either the inflow of the liquid 41 or the inflow of gas generated from the inflator 53.

  The protective bag 31 may be provided on either the side of the front seat or the side of the rear seat. In addition to being provided on the side door 32, the protective bag 31 is provided between the side outer panel and the inner trim located on the side of the rear seat of a two-door vehicle, a three-door hatchback vehicle, or a three-row seat specification vehicle, for example. May be provided. Moreover, you may provide between the side outer panel and inner trim in a single-sided sliding door vehicle.

Further, the technical idea that can be grasped from the embodiment will be described below.
The vehicle includes a side inner panel on the vehicle outer side than the inner trim, and the protective bag is provided between the side inner panel and the inner trim. Protective bag.

  The vehicle includes a side inner panel provided on the vehicle outer side than the inner trim, a liquid tank provided on the vehicle outer side than the side inner panel and filled with the liquid, and provided on the vehicle outer side than the liquid tank. The liquid tank is deformable in accordance with the deformation of the side outer panel at the time of a side collision of the vehicle, and the protective bag is provided between the side inner panel and the inner trim. The protective bag according to claim 2.

6. The protective bag according to claim 5, wherein, when the vehicle collides, the protective bag comes into contact with a waist portion of the occupant so as to follow the pelvis behind the acetabulum.
The protective bag according to claim 6, wherein, at the time of a side collision of the vehicle, the protective bag first comes into contact with a waist portion of the occupant at a portion corresponding to the iliac bone.

The protective bag according to claim 5 or 6, wherein a load applied to the occupant at the time of a side collision of the vehicle is input toward a sacroiliac joint of the occupant.
7. The protective bag according to claim 5, wherein a load input toward the greater trochanter of the occupant is reduced among loads applied to the occupant during a side collision of the vehicle.

  The said protective bag forms the taper surface which contact | abuts to the passenger | crew's waist | hip | lumbar part from the diagonal back of the said passenger | crew at the time of the side collision of the said vehicle. The protective bag described.

  The protective bag has a tapered surface that abuts against the waist of the occupant in an obliquely inclined state so as to be located closer to the vehicle interior side of the vehicle in the forward direction of the vehicle at the time of a side collision of the vehicle. It forms, The protective bag as described in any one of Claims 1-8 characterized by the above-mentioned.

The perspective view which shows the skeleton near the pelvis of a human body. (A) is a perspective view showing the skeleton near the human pelvis obliquely from the rear, and (b) is the skeleton shown in FIG. 2 (a), in which the right iliac bone is rotated forward about the sacroiliac joint. The perspective view which shows the mode of. FIG. 3 is a cross-sectional plan view schematically showing a waist portion of an occupant in a posture seated on a seat portion of a vehicle seat. (A) is equivalent to the front part (pubic side) and the rear part (sacral side) of the pelvis when simulating the relationship between the load applied to the lumbar part of the occupant seated on the seat and the skeleton of the occupant The graph which shows the time change of the load when a heavy load is input, (b) is a graph which shows the time change of the stress which a pelvis shows in the simulation at the time of performing the input of the load shown to Fig.4 (a). (A) is a front view which shows the expansion | deployment state of the passenger | crew who seated on the vehicle seat and the protection bag which restrains this passenger | crew's waist | hip | lumbar part, (b) is a plane sectional view along line 5b-5b of Fig.5 (a). (A) is a front view which shows the passenger | crew who seated on the vehicle seat, (b) is a plane sectional view which followed the 6b line | wire of Fig.6 (a). (A) is a perspective view which shows the state of the expansion | deployment initial stage of a vehicle seat and a protection bag, (b) is a plane sectional view which followed the 7b line | wire of Fig.7 (a). (A) is a perspective view which shows the protection bag of a modification, (b) is a front view of Fig.8 (a). The cross-sectional view which shows the protection bag of the example of a change.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Seat, 31 ... Protective bag, 36 ... Door trim as inner trim, 41 ... Liquid as fluid, 48 ... Armrest, 111 ... Pelvis, 121 ... Ilium, 125 ... Acetabulum, P ... Crew, L ... Lumbar .

Claims (8)

A protective bag that protects the occupant by restraining the waist of the occupant seated on the vehicle seat at the time of a side collision of the vehicle;
The vehicle is provided with an inner trim disposed on the side of the occupant,
The protective bag is deployed from the inner trim toward the occupant's waist by allowing a fluid to flow in at the time of a side collision of the vehicle.   The protective bag according to claim 1, wherein the fluid is a liquid.   The said protective bag is arrange | positioned at the side of the said waist | hip | lumbar part of the said passenger | crew, and expand | deploys sideward toward the said passenger | crew's waist | hip | lumbar part at the time of the side collision of the said vehicle. Protective bag. An armrest protrudes from the inner trim,
The said protective bag is arrange | positioned at the base end part of the said armrest, and expand | deploys toward the said passenger | crew's waist | hip | lumbar part from the lower part of the said armrest at the time of the side collision of the said vehicle. Protective bag.   5. The protective bag restrains the occupant's waist at a portion corresponding to the pelvis behind the acetabulum in the skeleton of the occupant seated on the vehicle seat. The protective bag as described in any one of these.   The said protective bag restrains the passenger | crew's waist | hip | lumbar part in the site | part corresponding to an iliac bone in the said passenger | crew's skeleton sitting on the seat of the said vehicle. The protective bag described.   The protective bag according to any one of claims 1 to 6, wherein the protective bag abuts against a waist portion of the occupant from an oblique rear side of the occupant at the time of a side collision of the vehicle.   The said protection bag is contact | abutted to the said passenger | crew's waist | hip | lumbar part in the state which inclined diagonally so that it might be located in the compartment side of this vehicle toward the back with respect to the advancing direction of the said vehicle at the time of the side collision of the said vehicle. The protective bag according to any one of claims 1 to 7.