JP6063541B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat equipped with an airbag in a seat back of the vehicle seat.

  2. Description of the Related Art In a vehicle seat such as an automobile, an airbag system that protects a seated person from an impact at the time of collision by inflating and deploying an airbag disposed in a seat back is known.

  For example, the vehicle seat disclosed in Patent Document 1 is provided with a seat pad on the front surface of an erection elastic support member erected inward of a seat back frame, and the erection elastic support member and the erection elastic support member are disposed behind the erection elastic support member. An air bag in a contracted state is disposed in a gap between the support plate having a simple structure.

  According to this vehicle seat, the airbag is inflated between the erection elastic support member and the support plate by the action of the inflator corresponding to the detection of a predetermined impact or more, and the rearward movement of the seated person at the time of the collision is seen from behind. While elastically supporting and regulating, the impact energy is absorbed by decompression and contraction of the airbag.

  In Patent Document 2, a first airbag that is inflated and deployed toward the seated person of the rear seat is installed at the lower back of the seat back of the front seat, and the seat back frame is further installed in the seat back of the front seat. A second airbag in a flat state is disposed on the front surface of the erection elastic support member that is erected on the inside.

  As a result, the first airbag is inflated and deployed toward the occupant of the rear seat by the action of the inflator corresponding to the detection of an impact exceeding a predetermined level, and the occupant of the rear seat moves forward due to the impact at the time of collision. Even so, it is prevented that the front seat strongly hits the back of the seat back. Furthermore, by the expansion and deployment of the second airbag, the rearward movement of the upper body of the seated person of the front seat at the time of a collision is elastically supported and restricted from the back to protect it. In addition, the timing of inflation of the first and second airbags is controlled to protect the appropriate seated person.

JP-A-10-273000 JP 2010-52621 A

  As described above, the vehicle seat disclosed in Patent Literature 1 achieves protection of a seated person of the seat seat by the presence of the airbag and a support plate having a strong structure on the rear outer side. In other words, the seat occupant is mitigated by the airbag against the rearward movement, and the impact applied from the rear of the seat back is first received by the support plate, and the impact is absorbed by the airbag. Will be.

  Accordingly, when there is a seat behind and there is a seated person, a collision from the rear of the seat back to the front seat of the seated person after that causes a large impact at the time of the collision with the support plate. Therefore, the impact from the rear cannot be received softly, and there is a possibility that not only the damage to the knee of the seated occupant of the rear seat, but also the impact to the seated occupant becomes large.

  On the other hand, according to the airbag device of Patent Document 2, the second airbag that is inflated and deployed in the seat back of the front seat can be expected to protect the seated person of the front seat and reduce damage, The first seat airbag is inflated and deployed toward the seated person, thereby protecting the rear seat seated person. However, in addition to the installation of the airbag in the seat back, a first airbag that inflates and deploys toward the rear outside of the seat bag must be separately provided at the lower portion of the seat bag of the front seat. And the control burden of each air bag increases.

  In addition, since the first airbag bulges obliquely upward from the lower back of the seat back of the front seat toward the seat occupant of the rear seat, and the inflated and deployed shape becomes unstable, the rear seat There is a risk of lack of stability in accurately and reliably receiving a collision of a seated person on the front seat with the seat back and absorbing the impact.

  As described above, in each structure of the above-mentioned conventional patent document, with a simple structure, for the direct protection of the seated person of the front seat by the airbag and the protection from the impact to the seat back from the rear, There is room for further improvement.

  In a vehicle such as an automobile, the collision of the seat of the front seat such as the knee of the seated person in the rear seat as described above is not only in the case of a collision from the front but also in the rear part of the vehicle body at the time of the collision from the rear. Due to deformation or the like, there is a possibility that this may occur even in a situation where the seated person of the rear seat is pushed forward and the knee strongly hits the back of the seat back of the front seat.

  The present invention has been made in view of the above-described problems, and its object is to directly protect a seated person in an airbag and to impact from the back of a seat back at the time of a collision without complicating the configuration. An object of the present invention is to provide a vehicular seat that enables accurate reduction of the vehicle.

The vehicle seat invention according to claim 1, which achieves the above object, comprises: a vehicle seat including a seatback frame and an airbag inside the seatback, wherein the airbag is inflated and deployed inside the seatback. The frame is formed in a substantially frame shape along the seat back shape as a whole, and the airbag is provided inside the substantially frame-shaped seat back frame, and a plurality of positions are provided in the frame of the substantially frame-shaped seat back frame. An inflator is attached to the floating body that is flexibly supported by the plurality of tension springs, and the flexible support is configured by a plurality of tension springs radiating between the seat back frame and the floating body, and the action of the inflator wherein the inflation and deployment of the seat back in the unit, the inflation and deployment and resiliently supporting the air bag the upper body of the seated person has by And, characterized in that it is carried out an impact force applied to the rear且Tsushi Tobakku as receive elastically.

According to this, the air bag to some extent is constrained stably inflated and deployed within the shape of the seat back in a seat back in a section located immediately after the seated person upper body. Therefore, the impact of the upper body being pressed against the front surface of the seat back by the rearward movement of the upper body of the seated person due to the collision and the impact applied to the rear surface of the seat back from the rear are accurately reduced. Since the protection of the seated person is performed only by inflating and deploying the airbag provided inside the seat bag, the configuration is greatly simplified.

  In addition, since the inflator is attached to the floating body in the frame of the seat back frame, it is possible to dispose the inflator at the approximate center in the width direction and the height direction of the airbag in the shape after the inflation and deployment. Gas can be dispersed and flown radially from the position to the airbag, and the airbag can be inflated and deployed more quickly and stably.

  Further, the inflator can be surely protected from the impact due to the collision by this arrangement.

  Further, even when a reaction force due to the inflation and deployment of the airbag is received, the position of the floating body is maintained at a predetermined position by the radial construction structure by the tension spring, and the stable inflation and deployment of the airbag is further ensured.

  Furthermore, even when the floating body is made of a flexible material, it is possible to hold the floating body while maintaining the state in which the floating body is flatly developed by the radial erection structure.

According to a second aspect of the present invention, there is provided a vehicle seat including a seatback frame and an airbag inside a seatback, wherein the airbag is inflated and deployed inside the seatback. The seatback frame has a seatback shape as a whole. And the airbag is provided inside the substantially frame-like seat back frame, and is flexibly supported at a plurality of positions in the frame of the substantially frame-like seat back frame. An inflator is attached, and the flexible support is constituted by a plurality of tension springs radiating between the seat back frame and the floating body, and the floating body is substantially in the extending direction of the seat back. a planar member extending in parallel, the inflated and deployed in the seatback portion by the action of the inflator, the inflation and deployment Airbag upper body of the seated person is supported elastically, characterized in that it is carried out an impact force applied to the rear且Tsushi Tobakku as receive elastically was.

According to this, the air bag to some extent is constrained stably inflated and deployed within the shape of the seat back in a seat back in a section located immediately after the seated person upper body. Therefore, the impact of the upper body being pressed against the front surface of the seat back by the rearward movement of the upper body of the seated person due to the collision and the impact applied to the rear surface of the seat back from the rear are accurately reduced. Since the protection of the seated person is made only by inflating and deploying the airbag provided inside the seat bag, the configuration is greatly simplified.

  In addition, since the inflator is attached to the floating body in the frame of the seat back frame, it is possible to dispose the inflator at the approximate center in the width direction and the height direction of the airbag in the shape after the inflation and deployment. Gas can be dispersed and flown radially from the position to the airbag, and the airbag can be inflated and deployed more quickly and stably.

Further, the inflator can be surely protected from the impact due to the collision by this arrangement. Further, even when a reaction force due to the inflation and deployment of the airbag is received, the position of the floating body is maintained at a predetermined position by the radial construction structure by the tension spring, and the stable inflation and deployment of the airbag is further ensured.

  According to this, the floating body can be arranged compactly even in a relatively narrow space between the airbag and the seat pad, and it becomes possible to secure a larger airbag inflation deployment space behind the floating body. .

  According to the present invention, the airbag is restrained to some extent by the internal shape of the seat back within the seat back located immediately after the seated person's upper body, and is stably inflated and deployed. Therefore, the impact of the upper body being pressed against the front surface of the seat back by the rearward movement of the upper body of the seated person due to the collision and the impact applied to the rear surface of the seat back from the rear are accurately reduced. Since the protection of the seated person is performed only by inflating and deploying the airbag provided inside the seat bag, the configuration is greatly simplified.

  In addition, since the inflator is attached to the floating body in the frame of the seat back frame, it is possible to dispose the inflator at the approximate center in the width direction and the height direction of the airbag in the shape after the inflation and deployment. Gas can be dispersed and flown radially from the position to the airbag, and the airbag can be inflated and deployed more quickly and stably.

  Further, the inflator can be surely protected from the impact due to the collision by this arrangement.

It is a schematic longitudinal cross-sectional view which shows the outline | summary of the vehicle seat in 1st Embodiment. It is the partially broken schematic perspective view of the vehicle seat seen from the back. It is a block diagram which shows the control circuit of an airbag. It is operation | movement explanatory drawing of the vehicle seat in the time of an impact generation. (A) is the sectional view on the aa line of FIG. 1, (b) is the sectional view on the bb line of FIG. (A) is a cross-sectional view of a seat back, (b) is an operation explanatory diagram. (A) is a cross-sectional view of a seat back, (b) is an operation explanatory diagram. It is explanatory drawing which shows the outline | summary of 2nd Embodiment, (a) is a longitudinal cross-sectional view of a seat back, (b) is operation | movement explanatory drawing. It is. FIG. 9 is a cross-sectional view taken along line cc in FIG. 8A and a cross-sectional view taken along line dd in FIG. (A) It is a longitudinal cross-sectional view of a seat back. (B) is an operation explanatory view. It is a schematic longitudinal cross-sectional view which shows the outline | summary of the vehicle seat which shows the outline | summary of 3rd Embodiment. (A) is the ee sectional view taken on the line in FIG. 11, (b) is operation | movement explanatory drawing. (A) is a cross-sectional view of a seat back, (b) is an operation explanatory diagram. It is a schematic longitudinal cross-sectional view of the vehicle seat which concerns on 4th Embodiment of this invention. It is a partially broken schematic perspective view of the vehicle seat according to the present embodiment as seen from the rear. It is operation | movement explanatory drawing at the time of the impact generation | occurrence | production of the vehicle seat which concerns on this Embodiment. It is a partially broken schematic perspective view seen from back of the vehicle seat which concerns on 5th Embodiment of this invention. It is a partially broken schematic perspective view seen from back of the vehicle seat which concerns on 6th Embodiment of this invention. It is XIX-XIX sectional drawing of FIG. It is a schematic cross-sectional view of a seat back for explaining the operation of the vehicle seat when a collision occurs. FIG. 19 is a schematic cross-sectional view showing a vehicle seat according to a modification of the sixth embodiment of the present invention in a cross section corresponding to the XIx-XIX cross section in FIG. 18. It is a schematic cross-sectional view of a seat back for explaining the operation of the vehicle seat according to this modification when a collision occurs. (A) It is the partially broken schematic perspective view which looked at the lower part of the vehicle seat which concerns on the modification of 5th Embodiment of this invention from back. (B) It is the XXIIIB-XXIIIB sectional view taken on the line of the same figure (A). (A) It is a schematic cross-sectional view which shows the effect | action of a lumbar support at the time of receiving a load from the vehicle body front. (B) It is a principal part enlarged view of the same figure (A). (A) It is a general | schematic cross-sectional view of the seat back explaining the action | operation at the time of the collision generation | occurrence | production of the vehicle seat which concerns on this modification. (B) It is a principal part enlarged view of the same figure (A). It is a schematic sectional drawing of the vehicle seat which concerns on 7th Embodiment of this invention. It is a partially broken schematic perspective view of the vehicle seat according to the present embodiment as seen from the rear. It is operation | movement explanatory drawing at the time of the impact generation | occurrence | production of the vehicle seat which concerns on this Embodiment.

  Embodiments of a vehicle seat according to the present invention will be described below with reference to the drawings.

(First embodiment)
A vehicle seat according to a first embodiment of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view showing an outline of a vehicle seat, FIG. 2 is a partially broken schematic perspective view of the vehicle seat viewed from the rear, FIG. 3 is a block diagram showing an airbag control circuit, and FIG. FIG. 5 is an operation explanatory view of the vehicle seat at the time, FIG. 5 is an operation explanatory view, (a) is a sectional view taken along the line aa in FIG. 1, and (b) is a sectional view taken along the line bb in FIG. In each figure, the arrow F indicates the vehicle body front direction, and the arrow OUT indicates the vehicle width direction outward.

  As shown in FIG. 1, a front seat 10 and a rear seat 60, which are vehicle seats, are arranged side by side on the floor 1 in the vehicle interior. The front seat 10 includes a seat cushion 11 that is supported on the floor 1 and supports the buttocks of the occupant Pf, a seat back 20 that supports the upper body Pb from the back to the chest of the occupant Pf, and a headrest 45. .

  As shown in FIGS. 1 and 2, in the front seat 10, a plurality of erection elastic support members 27 are stretched inside the seat back frame 21 that forms the skeleton of the seat back 20. A seat pad 28 is disposed on the front surface of the air bag 30, and an airbag 30 is disposed in a contracted state behind the erection elastic support member 27, and these are entirely covered with a bag-like skin 41.

  The seat back frame 21 is a U-shaped or U-shaped configuration comprising an upper frame 22 extending in the vehicle width direction and a pair of side frames 23 that are curved or bent from both ends of the upper frame 22 and extend downward. A pipe frame, a pair of left and right side brackets 24 arranged and fixed at the side end portions of the side frames 23, and a pipe shape extending in the vehicle width direction and installed near the upper ends of the left and right side frames 23 The upper cross member 25 and the lower cross member 26 installed between the lower ends of the left and right side brackets 24 are formed in a substantially rectangular frame shape.

  There are a plurality of erection elastic support members 27 such as S springs made of metal wires between the inner sides of the opposed side frames 23 and the inner side of the side brackets 24, and in this embodiment, three erection elastic support members 27 are provided. It is bridged. A seat pad 28 made of a urethane foam material or the like that elastically supports the upper body Pb of the seated person Pf is disposed on the front surface of the erection elastic support member 27, and is folded in a rectangular flat shape behind the erection elastic support member 27. The airbag 30 in a contracted state is disposed.

  The front portion 42 covering the front surface of the seat pad 28 with fabric (woven fabric, knitted fabric, non-woven fabric) or leather (natural leather, synthetic leather) that can expand and contract the entire seat back frame 21, seat pad 28, airbag 30 and the like, and air The seat back 20 is formed by covering with a skin 41 formed in a bag shape having a back surface portion 43 covering the bag 30. For example, the airbag 30 is held on the skin 41 or the like by a locking means (not shown) so as to be inflatable and deployable. A gas introduction part (not shown) is provided in the airbag 30 and is connected to an inflator 29 attached to the side bracket 24.

  The base end of each side bracket 24 constituting the seat back frame 21 of the seat back 20 is attached to the rotating arm 16 of the reclining device 15 disposed at the rear end of the seat cushion 11 by a mounting bolt 17 or the like. 21 is integrally connected to the rotating arm 16 of the reclining device 15. The reclining device 15 can be an existing well-known device and is not directly related to the present invention.

  Further, as shown in FIGS. 1 and 2, a pair of left and right cylindrical stay brackets 47 are integrally formed on the upper frame 22 of the seat back frame 21. By inserting and locking the stay 46 attached to the headrest 45 to the stay bracket 47, the headrest 45 is attached to the upper end of the seat back 20.

  On the other hand, the airbag 30 disposed between the erection elastic support member 27 and the back surface portion 43 of the outer skin 41 is erected as shown in the sectional view along the line aa in FIG. 1 in FIGS. 1 and 5A. On the side of the elastic support member 27, the peripheral edge of the substantially rectangular front side skin 32 facing the erected elastic support member 27, and the back side skin 33 arranged on the back surface 43 side of the skin 41 facing the front side skin 32. A plurality of belt-like or tape-like tethers 34 are provided between the front-side skin 32 and the rear-side skin 32 in the width direction central portion to regulate the amount of inflation and expansion in the front-rear direction. Passed.

  When the inflation gas is supplied from the inflator 29, the airbag 30 is inflated and deployed between the erection elastic support member 27 and the back surface portion 43 of the skin 41, and FIG. 4 and FIG. As shown in the cross section of the line -b, the expansion / deployment amount Lo in the front-rear direction is regulated by the tether 34 at the center in the width direction, and the outer portion 30a on the outer side of the vehicle body of the seat back 20, that is, the side wall 2 side. A large expansion and contraction amount La in the front-rear direction and a shock absorbing stroke are ensured so as to protrude rearward over the direction, and the inner side portion 30b on the center side in the vehicle interior width direction which is the inner side of the vehicle body extends in the vertical direction. Thus, it can bulge so as to protrude rearward, and a large front-rear expansion / deployment amount Lb can be secured. As the outer portion 30a and the inner portion 30b of the airbag 30 are inflated and deployed, the outer region 43a and the inner region 43b in the back surface portion 43 of the epidermis 41 are greatly expanded.

  That is, the inflated and deployed shape of the airbag 30 is set so that the amount of inflated and deployed in the front-rear direction is larger at the outer side 30a and the inner side 30b that are on the side of the seat back 20 from the center side of the seat back 20. The airbag 30 has an orifice (not shown) that discharges internal gas to the outside after inflation and deployment.

  The inflation and deployment of the airbag 30 is covered by the elastic support member 27 that holds the airbag 30 and the back surface portion 43 of the skin 41 that expands and bulges, and the deployment behavior is controlled to maintain a stable inflation and deployment. In addition, a sufficient amount of expansion and deployment can be obtained, and a shock absorbing stroke in the longitudinal direction of the vehicle body can be secured.

  FIG. 3 shows a control circuit for a vehicle airbag. The control circuit includes a control unit 50 for controlling the inflation and deployment of the airbag 30. The control unit 50 predicts a rear impact and impact load on the vehicle. The operation of the inflator 29 is controlled in accordance with the collision occurrence information from the rear collision detection sensor 51 as a means and the program stored in the ROM 53.

  Here, the control unit 50 has a built-in timer, and starts the timer from the time of prediction of a rear collision and measures time. The rear collision detection sensor 51 includes a distance sensor such as a millimeter wave sensor, for example, and measures a relative distance and a relative speed between the own vehicle and another vehicle that may cause a rear collision to measure the rear collision. Foresee. Further, the rear collision detection sensor 51 predicts an impact load at the time of the predicted rear collision.

  In the vehicle having the vehicle seat configured as described above, when the rear collision detection sensor 51 predicts a rear collision with a predetermined or higher impact load, a drive signal is output from the control unit 50 to the inflator 29. The inflation gas is ejected from the inflator 29. As a result, the airbag 30 is moved from the housed state as shown in FIGS. 1 and 5A between the erection elastic support member 27 and the back surface portion 43 of the skin 41 as shown in FIGS. 4 and 5B. Inflates and expands. The rearward movement of the upper body Pb of the front seat occupant Pf (represented schematically by the arrow Pfa in FIG. 5B) due to the rear-end collision causes the front portion 42 of the epidermis 41, the seat pad by the inflation and deployment of the airbag 30. 28. It is elastically received and regulated by the airbag 30 via the erection elastic support member 27.

  On the other hand, the rear seat occupant Pr moves in a straight line forward (represented schematically by an arrow Pra) due to deformation of the vehicle body caused by a rear impact or reburn after moving backward due to the rear impact and pressing the seat back. For example, the knee Pn may come into contact with the back surface of the seat back 20 of the front seat 10. At this time, the knee Pn is elastically received through the outer skin 41 by the airbag 30 inflated and deployed between the erection elastic support member 27 of the seat back 20 and the back surface portion 33 of the outer skin 31, and the forward movement is restricted. The upper body Pb of the seated person Pf of the front seat 10 is protected from the impact force caused by the knee portion Pn of the seated person Pr of the rear seat 60, and the seated person Pf of the front seat 10 is protected. Similarly, the impact force caused by the contact of the knee Pn of the seated person Pr of the rear seat 60 moving forward and the back of the seat back 20 and the impact force caused by the upper body of the chest and the like are elastically caused by the inflated and deployed airbag 30. Received and protected.

  In particular, the vehicle yaws due to an offset rear-end collision, etc., and the seated person Pf of the front seat 10 moves obliquely rearward (schematically indicated by the arrow Pfb) toward the vehicle body side wall 2 that is on the outer side of the vehicle body. When a situation occurs in which the seated person Pr moves obliquely forward (schematically indicated by the arrow Prb) toward the vehicle body side wall 2 side, the obliquely rearward movement of the upper body Pb of the seated person Pf of the front seat 10 41 is elastically received and regulated by the airbag 30 inflated and deployed via the front surface portion 42 of the seat 41, the seat pad 28, and the erection elastic support member 27, particularly the outer portion 30a in which the inflated and deployed amount La is secured.

  On the other hand, the knee Pn of the occupant Pr of the seat 60 in the rear seat 60 bulges back and expands between the erection elastic support member 27 of the seat back 20 and the side region 43a of the back surface 43 of the skin 41. The upper body Pb of the seated person Pf of the front seat 10 avoids the impact force caused by the knee part Pn of the seated person Pr. Similarly, the outer portion of the airbag 30 in which the inflated deployment amount and the shock absorbing stroke are ensured by the impact force of the knee Pn of the seated person Pr of the seat 60 Pr moving forward and the impact force of the upper body such as the chest. 30a is elastically received and is prevented from coming into contact with the vehicle body side wall 2.

  In addition, the vehicle yaws due to an offset rear-end collision or the like, and the seated person Pf of the front seat 10 moves obliquely backward (schematically indicated by an arrow Pfc) toward the vehicle width direction center side which is the inside of the vehicle body, and the rear When a situation occurs in which the seated occupant Pr moves obliquely forward (schematically indicated by an arrow Prc) toward the inner side of the vehicle body, the rearward movement of the upper body Pb of the occupant Pf of the front seat 10 41 is elastically received by the airbag 30, particularly the inner portion 30 b in which the inflated and deployed amount Lb is secured, via the front surface portion 42, the seat pad 28, and the erection elastic support member 27, and the rearward movement is restricted.

  On the other hand, the knee Pn of the rear seat occupant Pr is elasticized by the inner portion 30b that bulges backward and expands between the erection elastic support member 27 of the seat back 20 and the side region 43b of the back surface portion 43 of the skin 41. Therefore, the upper body Pb of the seated person Pf of the front seat 10 avoids the impact force by the knee portion Pn of the seated person Pr of the rear seat 60. Similarly, the impact force caused by the knee Pn of the seated person Pr of the rear seat 60 moving forward and the impact force caused by the upper body such as the chest are elastically received and protected by the inner portion 30b of the airbag 30.

  Therefore, according to this, the occupant in the airbag 30 at the time of a collision can be obtained without increasing the complexity of the configuration by increasing the amount of inflation and deployment of the outer portion 30a and the inner portion 30b of the airbag 30. It is possible to directly protect Pf and reduce the impact from the rear of the seat back 20 accurately.

  In the above embodiment, the inflated and deployed amounts La and Lb in the front-rear direction of the outer portion 30a and the inner portion 30b are set larger than the inflated and deployed amount Lo at the center portion of the airbag 30. It is also possible to increase the expansion / deployment amount only on the outer portion 30a with respect to the expansion / deployment amount Lo.

  An example of this will be described with reference to FIG. 6A is a cross-sectional view of the seat back, FIG. 6B is an operation explanatory view, and in FIGS. 6A and 6B, parts corresponding to those in FIGS. 5A and 5B are denoted by the same reference numerals. A detailed description of the part is omitted.

  As shown in FIG. 6A, the airbag 30 disposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 has a peripheral edge of the front side skin 32 and a peripheral edge of the back side skin 33. A plurality of tethers 34 are stretched between the front side skin 32 and the back side skin 32 in the width direction from the inside to the center portion.

  When the inflation gas is supplied from the inflator 29, the airbag 30 is regulated by the tether 34 in the longitudinal deployment amount Lo as shown in FIG. The outer portion 30a that swells so as to protrude rearward in the vertical direction ensures a large expansion and contraction amount La in the front-rear direction. That is, the inflated and deployed shape of the airbag 30 is set such that the outer side portion 30 a that is on the side of the seat back 20 is larger than the center side of the seat back 20.

  In a vehicle provided with the vehicle seat configured as described above, when a rear collision is predicted, air is introduced between the erection elastic support member 27 and the back surface portion 43 of the skin 41 as shown in FIG. The bag 30 is inflated and deployed. Accordingly, the rearward movement of the upper body Pb of the front seat occupant Pf due to the rear collision is elastically received by the airbag 30 and the rearward movement is restricted.

  On the other hand, the seated person Pr of the rear seat 60 is elastically received by the airbag 30 in which the knee Pn is inflated and deployed, and is restrained from moving forward, so that the impact force by the knee Pn is avoided and the seat 10 of the front seat 10 is seated. Pf is protected. Similarly, the impact force due to the upper body such as the knee Pn and the chest of the seated person Pr of the rear seat 60 moving forward is elastically received and protected by the inflated airbag 30.

  The vehicle yawing behaves due to a rear-end offset or the like, and the seated person Pf of the front seat 10 moves obliquely backward toward the vehicle body side wall 2 on the outer side of the vehicle body, and the rear seat seated person Pr moves toward the vehicle body side wall 2 side. When a situation of obliquely moving forward occurs, the rearward movement of the upper body Pb of the seated person Pf of the front seat 10 is caused by the airbag 30, particularly the amount of inflated and deployed, via the seat pad 28 and the erection elastic support member 27. Backward movement is restricted by the elastically received outer portion 30a.

  On the other hand, the knee Pn of the rear seat occupant Pr is elastically received by the outer portion 30a that bulges and expands rearward, and is restrained from moving forward and to the side wall 2 of the vehicle body, so that the front seat 10 occupant Pf Is protected. Similarly, the knee Pn and chest of the seated person Pr of the rear seat 60 moving forward are elastically received by the outer side portion 30a of the airbag 30 inflated and deployed, and contact with the vehicle body side wall 2 is prevented. To be protected.

  Further, the inflated and deployed amount Lb in the front-rear direction only on the inner side portion 30b side can be set larger than the inflated and deployed amount Lo at the center of the airbag 30. This example will be described with reference to FIG. FIG. 7A is a transverse sectional view of the seat back, and FIG. 7B is an explanatory view of the operation. FIGS. 7A and 7B are the same as those corresponding to FIGS. 6A and 6B. A detailed description of the parts is omitted.

  As shown in FIG. 7A, the airbag 30 disposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 has a peripheral edge of the front side skin 32 and a peripheral edge of the back side skin 33. A plurality of tethers 34 are bridged between the outer side in the width direction of the front side skin 32 and the rear side skin 32 and the central portion.

  When the inflation gas is supplied from the inflator 29, the airbag 30 is regulated in the longitudinal deployment amount Lo by the tether 34 as shown in FIG. The inner portion 30b bulges so as to protrude rearward in the up-down direction, and a large amount of expansion / deployment Lb in the front-rear direction is ensured. That is, the inflated and deployed shape of the airbag 30 is set so that the inner side portion 30 a that is the inner side of the seat back 20 is larger than the center side of the seat back 20.

  When a rear collision is predicted in a vehicle provided with a vehicle seat configured in this way, air is interposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 as shown in FIG. The bag 30 is inflated and deployed. Thereby, the rearward movement of the upper body Pb of the seated person Pf of the front seat 10 due to the rear collision is elastically received by the airbag 30 and the rearward movement is restricted.

  On the other hand, the knee Pn of the rear seat occupant Pr is elastically received by the inflated airbag 30 to restrain the forward movement, and the impact force by the knee Pn is avoided to protect the occupant Pf of the front seat 10. Is done. Similarly, the impact force due to the upper body such as the knee Pn and the chest of the seated person Pr of the rear seat 60 moving forward is elastically received and protected by the inflated airbag 30.

  A situation occurs in which the vehicle yawing behaves due to a rear-end collision, etc., and the seated person Pf of the front seat 10 moves obliquely backward toward the inside of the vehicle body, and the rear seat seated person Pr moves obliquely forward toward the inside of the vehicle body. In this case, the rear movement of the upper body Pb of the seated person Pf of the front seat 10 is caused by the airbag 30, particularly the inner portion 30b in which the inflated and deployed amount is secured, via the seat pad 28, the erection elastic support member 27, and the like. Backward movement is restricted by being elastically received.

  On the other hand, the knee Pn of the seated person Pr of the rear seat 60 is elastically received and restrained by the inner part 30b bulging and deployed rearward, so that the impact force by the knee part Pn is avoided and the front seat is avoided. The seat 10 seated person Pf is protected. Similarly, the upper body such as the knee Pn and chest of the seated person Pr of the rear seat 60 that moves forward is elastically received and protected by the inner part 30b of the inflated and deployed airbag 30.

  Only one of the outer part 30a and the inner part 30b of the airbag 30 is inflated and deployed largely rearward, so that the outer part 30a and the inner part 30b of the airbag 30 are both inflated and deployed. The bag 30 can be reduced in size and inflated and deployed, and the output of the inflator 29 can be suppressed.

(Second Embodiment)
A vehicle seat according to a second embodiment of the present invention will be described with reference to the drawings. 8A is a longitudinal cross-sectional view showing an outline of the vehicle seat, FIG. 8B is an operation explanatory view, FIG. 9A is a cross-sectional view taken along the line cc of FIG. 8A, and FIG. FIG. 9 is a sectional view taken along line dd in FIG. 8 and FIG. 9, the same reference numerals are given to the portions corresponding to those in FIG. 1 to FIG.

  As in the first embodiment, the seat back 20 in the front seat 10 has a plurality of erected elastic support members 27 extending inward of the seat back frame 21, and a seat pad 28 is provided in front of the erected elastic support member 27. At the same time, the airbag 30 is disposed in a stored state behind the erection elastic support member 27, and the whole is covered with a bag-shaped skin 41 having elasticity.

  As shown in FIGS. 8A and 8B, the airbag 30 has a substantially rectangular peripheral edge of the front-side skin 32 facing the installation elastic support member 27 on the installation elastic member 27 side, and a back surface portion 43 of the skin 41. It has the airbag bag body 31 which stitched together the periphery of the back side skin 33 arrange | positioned at the side. As shown in FIGS. 9 (a) and 9 (b), a plurality of strip-like or tape-like tethers 34 that regulate the amount of expansion and development in the front-rear direction between the front side skin 32 and the lower side skin 33 are provided in the sheet width direction. Bridged at intervals.

  When the inflation gas is supplied from the inflator 29, the airbag 30 is inflated and deployed between the erection elastic support member 27 and the back surface portion 43 of the skin 41, as shown in FIGS. 8B and 9B. In the lower side portion 30d corresponding to the height position of the knee Pn of the rear seat occupant Pr, which is the lower range of the seat back 20, the inflated and deployed amount Ld is regulated by the plurality of tethers 34, and is located above the seat back 20. The upper side portion 30h corresponding to the chest height position of the seated person Pr of the rear seat 60 bulges so as to protrude rearward, so that an inflated and deployed amount Lh in the front-rear direction can be secured. As the upper side portion 30h of the airbag 30 is inflated and deployed, the upper region of the back surface portion 43 of the epidermis 41 is greatly expanded or broken. That is, the inflated and deployed shape of the airbag 30 differs in the amount of deployment in the front-rear direction on the upper side and the lower side of the seat back 20, and greatly expands and deploys on the upper side with respect to the lower side.

  Further, as shown in FIG. 9B, in the lower side portion 30 d of the airbag 30, the amount of inflating and deploying in the front-rear direction is locally restricted by each tether 34, and the uneven surface 30 e is formed on the back side skin 33. The concavo-convex surface 30e formed on the back surface of the airbag 30 restrains and holds the knee pn of the seated person Pf who sits on the rear seat 60 serving as an impact applying portion that applies an impact force to the back surface of the seat back 20.

  The inflation and deployment of the airbag 30 is covered with the elastic support member 27 that holds the airbag 30 and the back surface portion 43 of the skin 41 that expands and bulges, and the inflation and deployment behavior is controlled to maintain a stable inflation and deployment. In addition, a sufficient expansion / deployment amount can be obtained, and a shock absorbing stroke in the longitudinal direction of the vehicle body can be secured.

  When a rear collision is predicted in a vehicle equipped with a vehicle seat configured in this way, air is interposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 as shown in FIG. The bag 30 is inflated and deployed. As a result, the rearward movement of the upper body Pb of the seated person Pf of the front seat 10 due to the rear impact is elastically received by the airbag 30 via the front surface portion 42 of the skin 41, the seat pad 28, and the erection elastic support member 27. Are regulated.

  On the other hand, the seated person Pr of the rear seat 60 moves forward due to a rear impact. At this time, the knee Pn is fitted into and restrained by the concave and convex surface 30e of the lower side portion 30d of the inflated airbag 30 and is elastically received to restrict forward movement, so that the upper body of the seated person Pf of the front seat 10 Pb is avoided from the impact force by the knee Pn of the seated person Pr of the rear seat 60, and the front seat seated person Pf is protected.

  Similarly, the knee Pn of the rear seat occupant Pr moving forward is elastically received and protected by the lower side portion 30d of the inflated and deployed airbag 30. At this time, as shown by an imaginary line Pn in FIG. 8 (b), it fits into an uneven surface 30e formed on the lower side portion 30d of the airbag 30, and the relative movement between the lower side portion 30d of the airbag 30 and the knee Pn is restricted. Thus, the air bag 30 is elastically received by the airbag 30.

  On the other hand, the upper body portion 30h of the airbag 30 that protrudes by being inflated and expanded greatly as shown by the phantom line in FIG. By being elastically received and protected.

  Further, in the above-described embodiment, the longitudinal expansion of the upper side portion 30h which is the upper side of the seat back 20 with respect to the amount of inflation in the front and rear direction of the lower side portion 30d of the airbag 30 which is the lower side of the seat back 20. Although the expansion amount is set large, the expansion and expansion amount in the front-rear direction of the lower side portion 30d can be set larger than the expansion and expansion amount in the front-rear direction of the upper side portion 30f.

  An example of this will be described with reference to FIG. 10A is a transverse sectional view of the seat back, and FIG. 10B is an operation explanatory view. In FIG. 10, parts corresponding to those in FIG. 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the seat back 20 of the front seat 10, a plurality of erection elastic support members 27 are stretched on the inner side of the seat back frame 21, a seat pad 28 is disposed on the front surface of the erection elastic support member 27, and the erection elasticity is increased. The airbag 30 is disposed behind the support member 27 and is entirely covered with a bag-shaped skin 41 having elasticity.

  As shown in FIGS. 10A and 10B, the airbag 30 disposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 has a peripheral edge of the front side skin 32 and a back side skin 33. The airbag bag body 31 is stitched together with the peripheral edge of the airbag. In addition, a plurality of tethers 34 that restrict the amount of expansion and expansion in the front-rear direction are bridged between upper portions of the front side skin 32 and the back side skin 33.

  When the inflation gas is supplied from the inflator 29, the airbag 30 is inflated and deployed between the erection elastic support member 27 and the back surface portion 43 of the skin 41, and as shown in FIG. The expansion side Lh is regulated by the plurality of tethers 34 in the upper side portion 30h that is the range, and the lower side portion corresponding to the height position of the knee Pn of the seated person Pr of the rear seat 60 that is the lower range of the seat back 20 In 30d, it expands so as to protrude rearward, and the expansion / deployment amount Ld in the front-rear direction is set large.

  In a vehicle provided with the vehicle seat configured as described above, when a rear-end collision is predicted, as shown in FIG. 10 (b), air is introduced between the erection elastic support member 27 and the back surface portion 43 of the skin 41. The bag 30 is inflated and deployed. As a result, the rearward movement of the upper body Pb of the seated person Pf of the front seat 10 due to the rear impact is elastically received by the airbag 30 via the front surface portion 42 of the skin 41, the seat pad 28, and the erection elastic support member 27. The rearward movement is restricted.

  On the other hand, the knee Pn of the seated person Pr of the rear seat 60 is elastically received by the lower side portion 30d of the airbag 30 that is greatly inflated and deployed, and the forward movement is restrained, and the upper body of the seated person Pf of the front seat 10 is restrained. Pb is avoided from the impact force by the knee Pn, and the front seat seat occupant Pf is protected. Further, the knee Pn of the seated person Pr of the rear seat 60 moving forward is elastically received and protected by the lower side portion 30d of the inflated and deployed airbag 30.

  Therefore, according to this, the amount of inflation and deployment in the front-rear direction in the lower side portion 30d is set larger than that in the upper side portion 30h of the airbag 30, or the amount of inflation and deployment in the front-rear direction of the upper side portion 30h relative to the lower side portion 30d. By setting it large, it is possible to directly protect the seated person Pf at the airbag 30 and to reduce the impact from the rear of the seat back 20 without complicating the configuration. In the airbag 30 as well, an uneven surface that restrains and holds the knee Pn of the seated person Pf seated on the rear seat 60 can be formed on the back surface of the airbag 30 in the same manner as described above.

(Third embodiment)
A vehicle seat according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a longitudinal section showing an outline of the vehicle seat, FIG. 12A is a sectional view taken along the line ee in FIG. 11, and FIG. 11 and 12, the same reference numerals are given to the portions corresponding to those in FIGS. 1 to 7, and the detailed description thereof will be omitted.

  The seat back 20 of the front seat 10 includes a plurality of erection elastic support members 27 extending inward of the seat back frame 21, a seat pad 28 disposed on the front surface of the erection elastic support member 27, and erection elastic support. The airbag 30 is disposed in a rearward state of the member 27 and is entirely covered with a bag-shaped skin 41 having elasticity.

  As shown in FIGS. 12A and 12B, the airbag 30 disposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 has the erection elastic support member 27 on the erection elastic member 27 side. It has an airbag bag body 31 in which the peripheral edge of the facing front skin 32 and the peripheral edge of the substantially rectangular rear skin 33 arranged on the side of the opposing back surface 43 are sewn together.

  As shown in FIG. 12B, the front side skin 32 of the airbag bag body 31 is deployed so that the front-rear direction inflation deployment amount Lf is relatively large, while the rear side skin 33 is the front-rear direction. Is set so as to be developed to be extremely small with respect to the expansion / deployment amount Lf of the front side skin 32. In other words, the airbag 30 has a larger amount of front-rear direction deployment on the erection elastic member 27 side, which is the front side, than the front-rear direction inflation amount, which is the rear side 43 side, which is the rear side of the seat back 20.

  When the airbag 30 set in this way is rapidly inflated and deployed between the erection elastic support member 27 and the back surface portion 43 of the skin 41, the amount of inflation and deployment is set evenly on the front side skin side and the back side surface side. Compared with the case where the airbag is inflated and deployed, a large pressing force is applied to the erection elastic member 27 side, while a relatively small pressing force is applied to the back surface portion 43.

  When a rear collision is predicted in a vehicle including the vehicle seat configured as described above, air is interposed between the erection elastic support member 27 and the back surface portion 43 of the skin 41 as shown in FIG. The bag 30 is inflated and deployed. As the airbag 30 is inflated and deployed, the installation elastic support member 27 side is pressed forward by a relatively large pressing force, and the seated person Pf of the front seat 10 is received relatively firmly, and the rearward movement of the seated person Pf is restricted. The

  On the other hand, the knee Pn of the rear seat occupant Pr is received relatively gently by the inflated airbag 30 and restrained from moving forward, and the upper body Pb of the occupant Pf of the front seat 10 is seated on the rear seat 60. It is avoided from the impact force by the knee Pr of the person Pr. Similarly, the knee Pn of the seated person Pr of the rear seat 60 moving forward is elastically received and protected by the lower side portion 30d of the inflated and deployed airbag 30.

  Further, the inflated and deployed shape of the airbag 30 can be set larger in the front-rear direction from the front side of the seat back 20 to the rear side. An example of this will be described with reference to FIG. 13 (a) and 13 (b) are cross-sectional views of the parts corresponding to FIGS. 12 (a) and 12 (b). In FIG. 13, parts corresponding to FIG. The detailed description of is omitted.

  The airbag 30 disposed between the erection elastic support member 27 and the back surface portion 43 of the outer skin 41 in the seat back 20 is erected on the erection elastic member 27 side as shown in FIGS. 13 (a) and 13 (b). An airbag bag body in which the peripheral edge of the rectangular front skin 32 facing the elastic support member 27 and the peripheral edge of the back skin 33 disposed on the back surface 43 side of the skin 41 facing the front skin 32 are sewn together. 31.

  As shown in FIG. 13B, the front side skin 32 of the airbag bag body 31 is deployed so that the front-rear direction inflation deployment amount Lf is relatively small, while the rear side skin 33 is front-rear direction. Is set so that the expansion and expansion amount Lr of the front surface side skin 32 expands significantly with respect to the expansion and expansion amount Lf of the front side skin 32. In other words, in the airbag 30, the front-rear deployment amount on the back surface 43 side is set larger than the front-rear expansion-deployment amount on the erection elastic member 27 side, which is the front side of the seat back 20.

  When the airbag 30 set in this way is rapidly inflated and deployed between the erection elastic support member 27 and the back surface portion 43 of the skin 41, the amount of inflation and deployment is set evenly on the front side skin side and the back side surface side. Compared with the case where the airbag is inflated and deployed, a large pressing force is applied to the back surface 43 side, while a relatively small pressing force is applied to the erection elastic support member 27 side.

  In a vehicle provided with the vehicle seat configured as described above, when a rear-end collision is predicted, an air bag is provided between the erection elastic support member 27 and the back surface portion 43 of the skin 41 as shown in FIG. 30 expands and expands. As the airbag 30 is inflated and deployed, the installation elastic support member 27 side is pressed forward by a relatively small pressing force, so that the seated person Pf of the front seat 10 is relatively gently received, and the rearward movement of the seated person Pf is restricted. .

  On the other hand, when the rear seat seated person Pr moves forward due to the impact of the rear impact, the knee Pn is received by the airbag 30 inflated and deployed relatively firmly by a relatively large pressure, and the front seat is restrained from moving forward. The upper body Pb of the seated person Pf of the seat 10 is avoided from the impact force of the knee Pn of the seated person Pr of the rear seat 60, and the front seat seated person Pf is protected. Similarly, the knee Pn of the seated person Pr of the rear seat 60 that moves forward is elastically received and protected by the lower side portion 30d of the inflated and deployed airbag 30.

  Therefore, according to the above-described embodiment, the rearward movement of the seated person due to the collision is elastically received with a simple configuration in which the amount of inflation and deployment of the airbag disposed in the seat back is set to be different in the front-rear direction. In addition, it is possible to protect the occupant from the impact from the rear, and it is possible to directly protect the occupant at the airbag in the event of a collision and to accurately reduce the impact from the rear of the seat back.

  In each of the above embodiments, the case where the inflation and deployment of the airbag 30 is controlled based on the collision prediction by the collision prediction means has been described as an example. However, the airbag is detected based on the collision detection by the collision detection means for detecting the collision. It is also possible to control the expansion and deployment of 30.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 14 is a schematic cross-sectional view of a vehicle seat according to the present embodiment, FIG. 15 is a partially broken schematic perspective view of the vehicle seat according to the present embodiment as viewed from the rear, and FIG. 16 is the present embodiment. It is operation | movement explanatory drawing at the time of the impact generation | occurrence | production of the vehicle seat which concerns. In the present embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Compared with the present embodiment and the first embodiment, the configuration of the airbag is different.

  In the present embodiment, the airbag 30 does not have a configuration in which the tether 34 is bridged, and is locked to the back surface portion 43 of the skin 41 in a state of being folded in a rectangular flat shape behind the erection elastic support member 27. ing. Since the airbag 30 is disposed between the erected elastic support member 27 and the back surface portion 43 of the skin 41, the airbag 30 receives a reaction force when the airbag 30 is inflated and deployed, as will be described later. In the present embodiment, the reaction force receiving member that directs the expansion / deployment direction is an erection elastic support member 27 that is bridged between the side brackets 24.

  Accordingly, as shown in FIGS. 14 and 15, the airbag 30 contracted into a substantially rectangular planar shape is incorporated in the seat back 20 through a gap between the erection elastic support member 27 and the back surface portion 43 of the skin 41, and The back 20 covers the front of the airbag 30 that is inflated and deployed with a flexible material such as a construction elastic support member 27, a seat pad 28, and a skin 41, while the rear of the airbag 30 is a skin 41 of a flexible material. Cover with.

  The operation of the vehicle seat 65 configured as described above will be described below by taking the rear collision of the vehicle as an example.

  When another vehicle collides with the vehicle having the vehicle seat 65 according to the present embodiment from the rear, when the rear collision detection sensor 51 predicts a rear collision with a predetermined or higher impact load, the controller 50 sends the inflator 29 to the inflator 29. The drive signal is output to the inflator 29 and the inflation gas is ejected. Thereby, as shown in FIG. 16, the airbag 30 is inflated and deployed instantaneously in the region between the erection elastic support member 27 and the back surface of the seat back 20.

  At this time, since the front of the airbag 30 is covered with a flexible material such as the erection elastic support member 27, the seat pad 28, and the skin 41, these flexible materials are shown in FIG. The rear part 43 of the skin 41 of the flexible material which covers the back of the airbag 30 shows a behavior of being deformed by protruding greatly toward the rear of the vehicle body.

  A characteristic of the vehicle seat 65 in the present embodiment is that the deployment amount E of the airbag 30 in the longitudinal direction of the vehicle body is ensured by the deformation behavior of the flexible material or the flexible material around the airbag 30. In addition, a large shock absorbing stroke in the longitudinal direction of the vehicle body by the seat back 20 can be secured.

  That is, as shown in the drawing, the rearward movement of the upper body of the vehicle seat 65 (front seat) seated person Pf due to the impact of the rear impact causes the skin 41 on the front surface of the seat back 20, the seat pad 28, the erection elastic support member. 27 and the airbag 30 that is inflated and deployed, the upper body of the vehicle seat 65 (front seat) seat Pf is protected from an impact that is pressed against the seat back 20 of the seat that is seated by the rear impact. Is done.

  On the other hand, the rear seat occupant Pr is pressed against the rear seat 65 by a rear impact, and moves forward by reburning thereafter. The knee of the rear seat occupant Pr that moves forward by this reburn is elastically received by the skin 41 on the back of the seat back 20 and the inflated and deployed airbag 30, and the vehicle seat 65 (front seat) occupant Pf The upper body is protected from the impact of the rear seat seat occupant Pr hitting the knee.

  At this time, since the airbag 30 is restrained to some extent by the internal shape of the seat back 20 within the seat back 20 positioned immediately after the upper body of the seat Pf of the vehicle seat 65, the airbag 30 is stably inflated and deployed. The rearward movement of the Pf upper body can be accurately received, and the impact caused by the forward movement of the knee of the rear seat seated person Pr can be accurately absorbed, and appropriate protection of the seated person Pf can be achieved.

  Further, the seated person Pf is protected by the arrangement of the airbag 30 that is inflated and deployed inside the seat back 20 and the flexible material in the front-rear direction (that is, the skin 41, the seat pad 28, the laid elastic support member 27, etc.). Therefore, the configuration is greatly simplified.

  In addition, since the airbag 30 can be actively inflated and deployed in the back direction of the seat back using the erection elastic support member 27 as a reaction force receiving member, the impact caused by the forward movement of the seated person Pr input from the back of the seat back can be further reduced. It can be absorbed effectively.

  In the above embodiment, the action when a collision occurs in the vehicle seat 65 has been described by taking the rear collision of the vehicle as an example, but the collision is not limited to the rear collision. For example, even in the case of a frontal collision, the order is changed, but the vehicle seat 65 is also elastically affected by the forward movement of the knee of the rear seat seater Pr by the inflation and deployment of the airbag 30. The rear movement of the upper body of the vehicle seat 65 seater can be elastically received after that.

(Fifth embodiment)
Next, a fifth embodiment of the vehicle seat of the present invention will be described with reference to FIG. In the fourth embodiment, the reaction force receiving member is the erection elastic support member 27, and the airbag 30 is disposed behind the erection elastic support member 27, so that the inflation and deployment direction of the airbag 30 is the rear of the seat back. However, in the present embodiment, a configuration in which the configuration of the reaction force receiving member is partially changed and the inflation and deployment direction of the airbag 30 is changed will be described. In the present embodiment, the same elements as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 17 is a partially broken schematic perspective view of the vehicle seat 70 according to the present embodiment as viewed from the rear. As shown in the figure, in the vehicle seat 70 according to the present embodiment, the overall configuration of the seat back 20 other than the configuration of the reaction force receiving member and the airbag is not changed from the fourth embodiment. The detailed description is omitted.

  In this embodiment, the erection elastic support member 72 is located between the side brackets 24 at the upper part of a substantially rectangular region R surrounded by the upper cross member 25, the side frame 23, the side bracket 24, and the lower cross member 26. These are two S springs made of a metal wire stretched over and stretched between the two.

  A flat lumbar support 74 is provided between the side brackets 24 at the lower portion of the substantially rectangular region R, and is provided on the U-shaped hooks 74 b provided on the side portions 74 a of the lumbar support 74 and the side brackets 24. It is supported by a tension spring 76 that is hooked to a U-shaped hook (not shown).

  The lumbar support 74 installed and supported by the tension spring 76 pushes the lumbar spine of the seated person Pf forward through the seat pad 28, thereby supporting a natural driving posture. That is, the gentle reverse S-shaped curve of the seated person Pf's spine is maintained, and the burden on the waist during long-time driving is reduced.

  The airbag 78 is disposed so as to be folded into a rectangular plane corresponding to the substantially rectangular region R in the rear view, and in the present embodiment, the seat pad is disposed in front of the erection elastic support member 72 and the lumbar support 74. 28 is locked.

  Therefore, in the present embodiment, the reaction force receiving members are the erection elastic support member 72 and the lumbar support 74, and the airbag 78 is disposed between these reaction force receiving members and the seat pad 28. .

  According to this configuration, when the airbag 78 is inflated and deployed inside the seat back 20 due to a collision (for example, a rear collision), the airbag 78 is provided with the erection elastic support member 72 and the lumbar support 74 disposed on the rear side thereof. It is possible to receive and absorb the impact of the upper seat occupant Pf being pressed against the seat back 20 more effectively by obtaining a large reaction force and positively inflating and deploying forward. .

(Sixth embodiment)
Furthermore, 6th Embodiment of the vehicle seat of this invention is described with reference to FIGS. 18 is a partially broken schematic perspective view of a vehicle seat according to the third embodiment of the present invention as seen from the rear, and FIG. 19 is a cross-sectional view taken along line XIX-XIX in FIG. These are the general | schematic cross-sectional views of the seat back explaining the action | operation at the time of the collision generation | occurrence | production of the vehicle seat. In the present embodiment, the reaction force receiving member is different from the fourth and fifth embodiments in that the following tension body 82 and floating body 84 are used in addition to the erection elastic support member 27.

  In this embodiment, as shown in FIGS. 18 and 19, a tension body 82 made of a rope made of natural fiber or chemical fiber is provided between the side brackets 24 and behind the erection elastic support member 27 as a floating body. 84 is supported in a floating manner in a normal rectangular region R surrounded by the upper cross member 25, the side frame 23, the side bracket 24, and the lower cross member 26 while having a predetermined slack.

  The floating body 84 is a cloth body or a net body that is configured to have a corner angle in a plan view (a corner angle is a shape obtained by cutting off four corners of a square), and a surface on the rear side of the vehicle body is a seat back. The air bag 30 is supported on the front surface of the vehicle body. The floating support of the floating body 84 by the tension body 82 will be described below.

  One end of two tension bodies 82a are fixed at predetermined intervals in the height direction inside the side bracket 24a on the inner side in the vehicle width direction of the vehicle, and these pass through the front of the airbag 30. However, it extends toward the side bracket 24b on the outer side in the vehicle width direction, is folded back toward the rear of the airbag 30 at the side end portion of the airbag 30, and the other end is a corner on the outer side in the vehicle width direction of the floating body 84. It is being fixed to the part 84a, respectively.

  One end of each of the two tension bodies 82b corresponding to the two tension bodies 82a is fixed inside the side bracket 24b on the outer side in the vehicle width direction of the vehicle, and passes through the front of the airbag 30. While extending across the tension body 82a and extending toward the side bracket 24a on the inner side in the vehicle width direction, the side end of the airbag 30 is folded back toward the rear of the airbag 30 and the other end is a vehicle with the floating body 84. It is fixed to each corner 84b on the inner side in the width direction.

  As shown in FIG. 19, an annular one-way clutch 86 for inserting both of the tension bodies 82 a and 82 b is attached to the intersection of the tension body 82 a and the tension body 82 b, and the tension bodies 82 a and 82 b are connected to the side bracket 24. The movement extended from the coupling end side to the floating body 84 is free, but the movement is returned in the opposite direction (that is, from the floating body 84 to the side brackets 24a and 24b). Is prevented by a check claw (not shown) provided inside the one-way clutch 86.

  Therefore, the airbag 30 is normally surrounded by the floating body 84 that is floatingly supported between the side brackets 24a and 24b via the tension bodies 82a and 82b having a predetermined slackness. In the substantially rectangular region R.

  According to this configuration, since the airbag 30 is located between the erection elastic support member 27 and the back surface of the seat back 20, when the airbag 30 is inflated and deployed by the action of the inflator 29 due to the collision, as shown in FIG. In addition, the erection elastic support member 27 acts as a reaction force receiving member, and the airbag 30 is inflated and deployed toward the back of the seat back 20.

  On the other hand, as the volume of the airbag 30 increases due to inflation and deployment, the slack of the tension bodies 82a and 82b is eliminated, and the tension bodies 82a and 82b and the floating body 84 are in tension. Then, since the airbag 30 receives reaction force from the tension bodies 82a and 82b and the floating body 84 in a tension state, the behavior of inflating and deploying toward the back of the seat back 20 is suppressed, and the inflating and deploying position is set on both sides. It is controlled to be held between the brackets 24.

  In the present embodiment, the reaction force receiving member uses the tension body 82 and the floating body 84 in addition to the erection elastic support member 27, but the floating body 84 is not used from the present embodiment. A modification will be described below with reference to FIGS.

  FIG. 21 is a schematic cross-sectional view showing a vehicle seat 80 according to the present modification in a cross section corresponding to the XIX-XIX cross section in FIG. 18, and FIG. 22 shows a collision of the vehicle seat 80 according to the present modification. It is a schematic cross-sectional view of a seat back for explaining the operation at the time of occurrence. As shown in FIG. 21, in the vehicle seat 80 according to the present modification, the overall configuration of the seat back 20 other than the configuration of the reaction force receiving member and the airbag is not changed from that of the sixth embodiment. Detailed description thereof will be omitted.

  In this modified example, as shown in FIG. 21, between the side brackets 24, the tension body 90 is located behind the erection elastic support member 27, and the upper cross member 25, the side frame 23, the side bracket 24, and the lower cross member. The airbag 92 is directly supported in a floating manner while having a predetermined slack in a normal rectangular region R surrounded by 26 (see FIG. 17 for the region R). The floating support of the airbag 92 by the tension body 90 will be described below.

  The airbag 92 is arranged by being folded into a rectangular plane corresponding to the substantially rectangular region R. In this modification, the airbag 92 is floatingly supported between the side brackets 24a and 24b by the tension body 90. In this state, the rear surface of the airbag 92 may be locked to the back surface of the seat back 20.

  As in the sixth embodiment, one end of the two tension bodies 90a is fixed inside the side bracket 24a on the inner side in the vehicle width direction of the vehicle with a predetermined interval in the height direction. As shown in FIG. 21, they extend toward the side bracket 24b on the outer side in the vehicle width direction while passing through the front of the airbag 92, and the vehicle body of the airbag 92 is located at a substantially central position between the side brackets 24a and 24b. It is inserted into the airbag from the front side surface, and the other end is fixed to the side end portion 92a on the outer side in the vehicle width direction. In this case, the tension body 90a is inserted into the airbag 92 through, for example, an orifice (not shown) that discharges internal gas to the outside.

  Further, one end of each of the two tension bodies 90b corresponding to the two tension bodies 90a is fixed inside the side bracket 24b on the outer side in the vehicle width direction of the vehicle, and passes through the front of the airbag 92. However, it crosses the tension body 90a and extends toward the side bracket 24a, and is inserted into the airbag 92 from the front surface of the airbag 92 at the approximate center position of the side brackets 24a and 24b. It is fixed to the side end portion 92b on the inner side in the vehicle width direction.

  An annular one-way clutch 94 through which both the tension bodies 90a and 90b are inserted is attached to the crossing portion of the tension bodies 90a and 90b in front of the airbag 92, and the tension bodies 90a and 90b are connected to one end side thereof. Although the movement extended to the other end side is free, the movement returned to the reverse direction is prevented.

  According to this configuration, since the airbag 92 is located between the erection elastic support member 27 and the back surface of the seat back 20, when the airbag 92 is inflated and deployed, as shown in FIG. Acting as a reaction force receiving member, the airbag 92 is inflated and deployed toward the back of the seat back 20.

  On the other hand, the tension bodies 90a and 90b are pulled using the force by which the airbag 92 is inflated and deployed in the width direction of the seat back 20, and the tension bodies 90a and 90b are in a tension state. Then, since the airbag 92 receives a reaction force from the tension bodies 90a and 90b in a tension state, the behavior of inflating and deploying toward the back of the seat back 20 is suppressed, and the inflating and deploying position is between the side brackets 24. It will be controlled to be retained.

  That is, by ingenuating the floating support structure of the airbag 92 by the tension body 90, the inflated and deployed position of the airbag 92 can be controlled with a simpler configuration.

  Further, a modification of the lumbar support of the fifth embodiment will be described below with reference to FIGS. FIG. 23 (A) is a partially broken schematic perspective view of a lower part of a vehicle seat 70 according to a modification of the fifth embodiment of the present invention as seen from the rear, and FIG. FIG. 24A is a cross-sectional view taken along line XXIIIB-XXIIIB in FIG. 24A, and FIG. 24A is a schematic cross-sectional view showing the operation of the lumbar support when a load is applied from the front of the vehicle body, and FIG. FIG. 25A is a schematic cross-sectional view of a seat back for explaining an operation at the time of occurrence of a collision of the vehicle seat 70 according to this modification, and FIG. It is a principal part enlarged view of the figure (A).

  As shown in FIGS. 23A and 23B, in the vehicle seat 70 according to this modification, the overall configuration of the seat back 20 other than the configuration of the reaction force receiving member and the airbag is the fifth embodiment. Since there is no change in the form of, detailed description thereof is omitted.

  As in the fifth embodiment (see FIG. 17), the erection elastic support member 72 is an upper part of a substantially rectangular region R surrounded by the upper cross member 25, the side frame 23, the side bracket 24, and the lower cross member 26. Are two S springs made of a metal wire stretched between the side brackets 24 and stretched.

  In the present modification, the lumbar support 100 is formed in the height direction on the rear surface of the resin plate 100a having a certain rectangular shape in a rear view and having a certain flexibility, as shown in FIGS. 23 (A) and (B). An elongated strip-shaped plate material 100b (which is less flexible than the resin plate 100a) is continuously arranged and bonded together, and a U-shaped hook 100d provided on the side portion 100c and each side It is installed and supported by a tension spring 76 that is hooked to a U-shaped hook 24 c provided on the bracket 24.

  The adjacent plate members 100b are arranged without gaps in the present modification, but by adjusting the interval between the adjacent plate members 100b, the deformation amount of the lumbar support 100 in a direction that protrudes toward the front side of the vehicle body as will be described later It is possible to set how much to suppress.

  In the present modification, the airbag 102 is disposed in a contracted state in which the airbag 102 is folded into a rectangular plane corresponding to the substantially rectangular region R in the rear view behind the erection elastic support member 72 and the lumbar support 100.

  According to this configuration, as shown in FIG. 24 (A), the lumbar support 100 does not apply to the load F1 that the seated person Pf of the front seat 10 leans against the seat back 20 during driving of the vehicle. Following the shape of the seat pad 28 that is deformed by receiving the load F1, it is slightly bent and deformed so as to protrude toward the rear of the vehicle body. As shown in FIG. 24B, this deformation is possible due to the deformation of the resin plate 100a having a certain flexibility and the gap 104 between the adjacent plate materials 100b according to the deformation of the resin plate 100a. It becomes.

  When the airbag 102 is inflated and deployed, since the airbag 102 is located between the erection elastic support member 72 and the lumbar support 100 and the back of the seat back 20, as shown in FIG. The member 72 and the lumbar support 100 act as a reaction force receiving member, and the airbag 102 exhibits a behavior of inflating and deploying toward the back of the seat back 16.

  At this time, as shown in FIG. 25 (B), the lumbar support 100 receives a force acting on the front side of the vehicle body from the airbag 102. However, because the adjacent plate members 100b interfere with each other, the lumbar support 100 moves in the vehicle body front direction. There is no deformation to be convex.

  In other words, the lumbar support 100 normally improves the feeling of use of the seat pad 20 by receiving the load F1 from the front of the vehicle body and flexing and deforming to the rear of the vehicle body. Acts as a powerful reaction force receiving member that expands and expands backward.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIGS. 26 is a schematic sectional view of the vehicle seat 110 according to the embodiment of the present invention, FIG. 27 is a partially broken schematic perspective view of the vehicle seat 110 according to the present embodiment as viewed from the rear, and FIG. It is operation | movement explanatory drawing at the time of the impact generation | occurrence | production of the vehicle seat 110 which concerns on embodiment.

  The present embodiment is different from the fourth embodiment in that the floating body is flexibly supported in front of the airbag 30 via an erection elastic support member. This will be described below.

  As shown in FIG. 26, the erection elastic support member 112 includes a U-shaped hook 114b provided on the side portion 114a of the floating body 114 and a U-shaped hook (not shown) provided on each side bracket 24 in the present embodiment. These are tension springs made of metal wires that are hooked on and suspended from the center of the floating body 114, and three are stretched over the side brackets 24 in a radial manner. The erection elastic support member 112 is not limited to a tension spring, and an S spring or the like can be used.

  As shown in the figure, the floating body 114 is formed into a substantially rectangular flat plate shape in plan view. In the present embodiment, a cured synthetic resin is used, but a flexible cloth or a net floating body may be used. Even in such a flexible floating body, a state in which the flexible floating body is developed in a planar shape by a plurality of erected elastic support members 112 radiated between the floating body and the seat back frame 21. It is possible to hold it while maintaining it.

  In this embodiment, a lumbar support is constituted by the erection elastic support member 112 and the flat plate-like floating body 114, and this floating body 114 is an upper body of the seated person Pf via a seat pad 28 described later. A natural driving posture is supported by pressing and supporting the front. Furthermore, by adjusting the height position of the flat floating body to an appropriate position, a gentle reverse S-curve of the spine of the seated person Pf is maintained, and the burden on the waist during long-time driving can be reduced. Become.

  A seat pad 28 made of a urethane foam material or the like that elastically supports the upper body of the seated person Pf is disposed on the front surface of the floating body 114, and is folded into a rectangular planar shape behind the floating body 114. An air bag 30 in a contracted state is disposed.

  As described above, the seat back 16 is formed that can elastically support the upper body of the seated person Pf, particularly the chest or waist, from the back.

  In the seat back 16, the airbag 30 is, for example, a rear surface thereof is held on the skin 41 or the like so as to be inflatable and deployable by locking means (not shown), and the front surface is the rear surface 114 c of the floating body 114. It is locked to be inflatable and deployable. As will be described later, the airbag 30 includes a cylindrical inflator 29 that is a gas generation source for inflating and deploying the airbag 30, and instantaneously and planarly under the gas injection of the inflator 29. Configured to inflate and deploy.

  Therefore, as shown in FIGS. 26 and 27, the airbag 30 contracted in a substantially rectangular plane is built in the seat back 20 through the gap between the floating body 114 and the skin 41, and the seat back 20 is inflated. The front of the airbag 30 to be deployed is covered with a flexible material such as the floating body 114, the seat pad 28, and the skin 41 softly supported by the erection elastic support member 112, while the rear of the airbag 30 is made of a flexible material. Cover with skin 41.

  When another vehicle collides from behind with the vehicle having the vehicle seat 110 according to the present embodiment configured as described above, control is performed when the rear collision detection sensor 51 predicts a rear collision with a predetermined or higher impact load. A drive signal is output from the part 50 to the inflator 29, and the inflation gas is ejected from the inflator 29. As a result, as shown in FIG. 28, the airbag 30 is inflated and deployed instantaneously in the region between the floating body 114 and the back surface of the seat back 20.

  At this time, since the front of the airbag 30 is covered with a flexible material such as the erection elastic support member 112, the floating body 114, the seat pad 28, and the outer skin 41, these flexible materials are obtained by inflating and deploying the airbag 30. 28 shows a behavior of slightly deforming in the front direction of the vehicle body in FIG. 28, and the skin 41 of the flexible material covering the rear of the airbag 30 projects greatly to the rear of the vehicle body and deforms.

  According to the vehicle seat 110 in the present embodiment, as in the fourth embodiment, the deformation behavior of the flexible material or the flexible material around the airbag 30 causes the airbag 30 in the longitudinal direction of the vehicle body. A deployment amount E is ensured, and a large shock absorbing stroke in the longitudinal direction of the vehicle body by the seat back 20 can be secured.

  That is, as shown in the figure, the rearward movement of the upper body of the vehicle seat 110 (front seat) seater Pf due to the impact of the rear impact is caused by the skin material 41, the seat pad 28 on the front of the seat back 20, the installed elastic support. The upper body of the vehicle seat 110 (front seat) seater Pf is elastically received by the floating body 114 flexibly supported by the member 112 and the inflated and deployed airbag 30, and the seat of the seat on which the seat is seated by the rear impact. It is protected from an impact that is pressed against the back 20.

  On the other hand, the rear-seat seat occupant Pr is pressed against the rear-seat seat by the impact of the rear-end collision, and moves forward in the subsequent rebound. The knee of the rear seat occupant Pr that moves forward by this rebound is elastically received by the skin 41 on the back of the seat back 20 and the inflated and deployed airbag 30, and the vehicle seat 110 (front seat) occupant Pf The upper body is protected from the impact of the rear seat seat occupant Pr hitting the knee.

  At this time, since the airbag 30 is restrained to some extent by the internal shape of the seat back 20 within the seat back 20 located immediately after the upper body of the seat Pf of the vehicle seat 110, the airbag 30 is stably inflated and deployed. The rearward movement of the Pf upper body can be accurately received, and the impact caused by the forward movement of the knee of the rear seat seated person Pr can be accurately absorbed, and appropriate protection of the seated person Pf can be achieved.

  Further, the protection of the seated person Pf is flexibly supported by the airbag 30 that is inflated and deployed in the seat back 20 and the flexible material in the front-rear direction (that is, the skin 41, the seat pad 28, and the erection elastic support member 112). The structure is greatly simplified.

  In addition, since the inflator 29 is attached to the floating body 114 in the frame of the seat back frame 21 with the center of the front surface of the airbag 30 interposed, the width direction and height of the airbag 30 in the shape after inflated and deployed. The inflator 29 can be disposed in the substantially central position in the vertical direction, and the gas can be radially distributed from the central position to the airbag 30 to flow in, and can be quickly and stably maintained in a balanced state as a whole. Thus, the airbag 30 can be inflated and deployed.

  At the same time, the arrangement allows the inflator 29 to be surely protected from impact caused by a collision, and allows gas to flow into the airbag 30 from the front with respect to the input direction of the knee portion of the rear seat occupant Pr. Thus, it becomes possible to protect the front seat seated person Pf more accurately.

  Further, due to the radial construction structure of the floating body 114, the reaction force when the airbag 30 is inflated and deployed is accurately received by the floating body 114 (that is, the seat back height direction and width of the floating body 114 receiving this reaction force). As a result, the airbag 30 can be more stably inflated and deployed rearward.

  Further, since the floating body 114 is a flat plate-like member that extends substantially in parallel with the extending direction of the seat back 20, that is, the width direction, it can be compactly disposed between the airbag 30 and the seat pad 28. Therefore, a large airbag inflating and deploying space behind the floating body 114 is secured.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, unlike the fourth embodiment, the reaction force receiving member may be an existing component of the other seat back frame 21 such as the upper cross member 25 or the lower cross member 26.

  Specifically, for example, the airbag 30 may be attached to the upper cross member 25 and the airbag 30 may be disposed between the upper cross member 25 and the back of the seat back 20. According to this, when gas is introduced from the upper cross member 25 side by the action of the inflator and the airbag 30 is inflated and deployed, a reaction force is obtained by the upper cross member 25 and the airbag 30 is It can be inflated and deployed backward and downward. According to this configuration, it is possible to effectively absorb an impact input from behind and below the back surface of the seat back 20.

  As described above, by appropriately arranging the reaction force receiving member and the airbag, the airbag can be inflated and deployed so as to face the input direction of the impact, and the impact can be absorbed more effectively. It becomes possible.

  Further, for example, in the seventh embodiment, the erection elastic support member 112 is bridged between the side brackets 40 via the floating body 114, but the upper cross member 25 and the lower cross member 26 are interposed via the floating body 114. It is good also as a structure spanning between.

  Furthermore, in the above-described embodiment, the vehicle seat (front seat) and the rear seat are provided in parallel, but the rear seat is not an essential component. For example, the rear part of the vehicle seat may be a loading platform. Even in this case, due to the inflation and deployment of the airbag 30, the load on the loading platform moves forward due to the collision of the vehicle, and the seated person of the vehicle seat is protected from the impact of the load on the back of the seat back 20. be able to.

10, 65, 70, 80, 110 Vehicle seat 20 Seat back 21 Seat back frame 27, 72, 112 Construction elastic support member (reaction force receiving member)
28 Seat pad 30, 78, 92, 102 Airbag 30a Outer part 30b Inner part 30d Lower side part 30h Upper side part 41 Skin 42 Front part 43 Rear part 60 Rear seat 74, 100 Lumber support (reaction force receiving member)
82a, 82b, 90a, 90b Tension body (reaction force receiving member)
84 Floating body (Reaction force receiving member)
114 float

Claims (2)

In a vehicle seat comprising a seatback frame and an airbag inside the seatback, and inflating and deploying the airbag inside the seatback,
The seat back frame is formed in a substantially frame shape along the seat back shape as a whole,
The airbag is provided inside a substantially frame-shaped seat back frame,
An inflator is attached to a floating body that is flexibly supported at a plurality of positions in the frame of the substantially frame-shaped seat back frame,
The flexible support is constituted by a plurality of tension springs radiated between the seat back frame and the floating body,
The inflated and deployed in the seatback portion by the action of the inflator, air bag and the inflated deployed to support the upper body of the seated person elastically resiliently impact force applied to the rear且Tsushi Tobakku It is performed so that it may be received in the vehicle seat. In a vehicle seat comprising a seatback frame and an airbag inside the seatback, and inflating and deploying the airbag inside the seatback,
The seat back frame is formed in a substantially frame shape along the seat back shape as a whole,
The airbag is provided inside a substantially frame-shaped seat back frame,
An inflator is attached to a floating body that is flexibly supported at a plurality of positions in the frame of the substantially frame-shaped seat back frame,
The flexible support is constituted by a plurality of tension springs radiated between the seat back frame and the floating body,
The floating body is a planar member extending substantially parallel to the extending direction of the seat back,
The inflated and deployed in the seatback portion by the action of the inflator, air bag and the inflated deployed to support the upper body of the seated person elastically resiliently impact force applied to the rear且Tsushi Tobakku It is performed so that it may be received in the vehicle seat.

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