JP5532787B2 - Vehicle seat equipped with an airbag device - Google Patents

Description

  The present invention belongs to a technical field related to a vehicle seat provided with an airbag device.

  Conventionally, an air bag unit is built in the lateral side of the seat back of the vehicle seat in the vehicle width direction, and the airbag bag body of the air bag unit is seated on the seat at the time of a side collision of the vehicle. It is well known to protect an occupant by absorbing the impact force caused by the collision by deploying to the side of the occupant (between a vehicle body such as a door deformed by the collision and the occupant). For example, as shown in Patent Document 1, the airbag bag body is an opening formed by breaking a sewing portion between a front side skin and a side side skin in a seat back and breaking the sewing portion. It is comprised so that it may expand | deploy to the outer side of a seat back.

  Here, in Patent Document 1, a resin cover member is disposed on the inner side of the pad on the lateral side of the seat back in the vehicle width direction. The cover member has a mounting portion fixed to the side frame and a guide portion that is curved so as to cover the front side of the seat of the airbag unit, and the airbag unit is disposed between the cover member and the side frame. The guide portion covers the front side of the seat of the airbag unit. The airbag bag body pushes and opens the guide portion of the cover member at the time of deployment to break the sewn portion, and deploys to the outside of the seat back from the opening due to the breakage of the sewn portion.

Japanese Patent No. 3020048

  However, the thing of the said patent document 1 has the following problems. That is, when the airbag bag body pushes and opens the guide part of the cover member, the side skin is pressed to the outside of the seat by the guide part and moves to the outside of the seat. Since it is pulled by the side surface skin through the sewing portion, the front surface skin moves along with the side surface skin while extending. For this reason, there is a tendency for the breakage of the sewn portion between the front side skin and the side side skin to be delayed, and there is room for improvement in order to deploy the airbag bag body to the outside of the seat earlier.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an airbag bag when an airbag unit is built in a side portion on the vehicle width direction outer side of a seat back of a vehicle seat. The aim is to ensure that the body is stably deployed outside the seat back as early as possible.

In order to achieve the above object, according to the present invention, in the event of a vehicle collision, the air bag includes an airbag bag body and an inflator that are built in the side portion of the seat back on the outer side in the vehicle width direction. By supplying gas to the bag bag body, the airbag bag body breaks the sewn part between the front side skin and the lateral side skin on the outer side in the vehicle width direction in the seat back, and breaks the sewn part The airbag in the seat back outside the airbag unit is intended for a vehicle seat provided with an airbag device configured to be deployed from the opening formed by the seat to the outside of the seat back. A cover member disposed at a height position corresponding to the unit and attached to the first fixing portion in the seat back; A flexible low-stretch member disposed in the seat back in the seat width direction and having a lower stretch rate than the front-side skin, and the cover member has a seat front side end of the cover member. The sewing machine is disposed so as to extend in the vertical direction substantially along the sewing portion in the state of being close to the sewing portion, and the front end of the seat of the cover member is formed on the side skin by the deployment pressure of the airbag bag body. It is formed so that it can be deformed into a cantilever shape so as to press the end of the portion side or the vicinity thereof to the outside of the seat, and one end portion of the low extension member is positioned in the vertical direction at the front end of the seat of the cover member It is located in a part of the range, and is attached to the end portion on the sewing portion side in the front side skin or the vicinity thereof, while the other end portion of the low extension member is a second fixing portion in the seat back Attached to The airbag unit is disposed between the cover member and the low extension member, and the second fixing portion is located on the rear side of the seat with respect to the first fixing portion, and the low extension member Is attached to the second fixing part across the front side of the seat of the airbag unit from the one end part attached to the sewing part side of the front side skin or the vicinity thereof. The deployment pressure of the airbag bag body is directly applied to a portion that extends to the end portion and crosses the seat front side of the airbag unit in the low-stretch member. length along the sewing portion, than the length along the sewn portion of the seat front edge of the cover member short rot, deformation part is deformable portion to the cantilevered in said cover member, Cantilever extending from the lateral position of the airbag unit to the front side of the seat substantially straight toward the sewing portion, with the vicinity of the rear end of the seat of the deformed portion as the base end due to the deployment pressure of the airbag bag body The position that becomes the base end when the deformed portion is deformed into a cantilever shape is located on the front side of the seat with respect to the second fixed portion .

  With the above configuration, the seat front side end of the cover member extends in the vertical direction substantially along the sewing portion in a state in which the cover member is close to the sewing portion. Therefore, the cover member is deformed to the outside of the seat by the deployment pressure of the airbag bag body. As a result, the sheet front side end of the cover member immediately presses the end of the side surface skin on the side of the sewing portion or the vicinity thereof to the outside of the sheet. Further, since the airbag unit is arranged between the cover member and the low extension member, the airbag bag body presses the cover member and the low extension member to the opposite sides by the deployment pressure, thereby The low-stretch member that is difficult to stretch restrains the end of the front side skin on the side of the sewing portion from being pulled and moved by the side skin that is pressed by the cover member. Therefore, breakage of the sewing portion is promoted. Furthermore, since the one end part of the low extension member is located in a part of the range where the front side end of the cover member is located in the vertical direction, a part of the sewing part (the part to which the one end part of the low extension member is attached) The portion where the breaking force is concentrated is the starting point of the breaking of the sewing portion. By making the starting point of the break in this way, the breakage of the sewing portion is further promoted. Therefore, deployment of the airbag bag body to the outside of the seat is performed early and stably.

In addition, since the deforming portion extends from the side position of the airbag unit to the front side of the seat substantially straight toward the sewing portion, the front end of the cover member in the seat width direction is greatly deformed outward in the seat width direction when the deforming portion is deformed. The breakage of the sewing portion can be further promoted. Further, since the cover member extends almost straight, it is easily deformed to the outside in the seat width direction without disturbing the deployment of the airbag bag body to the front side of the seat, so that the airbag bag body can be deployed early. And it is done smoothly.

  In the vehicle seat, it is preferable that one end portion of the low extension member is positioned at a substantially central portion in a range where the seat front side end of the cover member is positioned in the vertical direction.

  If it carries out like this, an airbag bag body can be rapidly expand | deployed to the desired height position to expand | deploy. That is, if one end of the low-stretch member (that is, the starting point of breakage) is above or below the center of the range where the front end of the cover member is located, the airbag bag body is Since an attempt is made to develop from the position of the opening starting point to the outside of the seat back, initially there is a tendency to develop by shifting upward or downward with respect to a desired height position. And finally, the opening due to the above breakage is formed at substantially the same height position as the airbag unit, and the airbag bag body is deployed at a desired height position. In order to develop the height position as accurately and quickly as possible, it is preferable that one end portion of the low extension member is located in a substantially central portion of a range where the front end of the cover member is positioned in the vertical direction.

  In the vehicle seat, the cover member has a housing portion that houses the airbag unit, and is configured to be attachable to the first fixing portion in a state where the airbag unit is housed in the housing portion. It is preferable.

  In this way, the airbag unit and the cover member can be simultaneously attached to the first fixing portion (for example, provided on the seat back frame or a bracket fixed to the seat back frame). And the assembly | attachment property of a cover member can be improved.

  In the vehicle seat, the low extension member is disposed between the airbag unit and a pad on the inner side in the seat width direction than the airbag unit, and the other end of the low extension member is It is preferable that the second fixing portion is attached to a seat back frame.

  As a result, the low-extension member is directly pressed by the airbag bag body without going through the pad, so that the end on the sewing part side in the front side skin is restrained more quickly so as not to move together with the side skin. Will be able to. In addition, since the other end of the low extension member is attached to a highly rigid seat back frame, the restraint can be performed stably.

  When the other end portion of the low extension member is attached to the seat back frame as described above, the other end portion of the low extension member is preferably attached to a seat rear side portion of the seat back frame.

  Thereby, the attachment property to the seat back frame of the other end part of the low extension member can be improved. That is, at the time of manufacturing the sheet, the low extension member is previously attached to the front side skin. Then, after assembling the pad, the airbag unit, the cover member, etc., the front side skin, to which one end of the low-extension member is attached in advance, is put on the pad from the front side of the seat. For this reason, the attachment work to the seat back frame of the other end of the low extension member is usually performed from the back side of the seat. Therefore, if the other end portion of the low extension member is attached to the seat rear side portion of the seat back frame, the attaching operation can be easily performed from the seat back side.

  As described above, according to the vehicle seat equipped with the airbag device of the present invention, when the airbag bag body breaks the sewing portion by pressing the cover member to the outside of the seat, The end of the side skin is sewn to the side skin that is pressed by the cover member so as not to move, and a part of the sewing part (one end of the low extension member is attached) Since the rupture force is concentrated on the part) to create the starting point of the sewed part, the sewed part can be promoted and the airbag bag body can be moved to the outside of the seat back quickly and stably. Can be deployed.

It is the perspective view seen from the back on the right side of the seat, showing the internal configuration of the seat back of the vehicle seat according to the embodiment of the present invention. It is the cross-sectional view which cut | disconnected the right side part of the seat back along the left-right direction. It is the side view seen from the seat right side which shows the internal structure of a seat back. FIG. 3 is a view corresponding to FIG. 2 showing a state when the airbag bag body is deployed. FIG. 3 is a view corresponding to FIG. 2 showing a reference example of the arrangement of the low extension members. FIG. 9 is a view corresponding to FIG. 2 and showing another reference example of the low extension member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG.1 and FIG.2 shows the internal structure of the seat back 3 of the vehicle seat 1 which concerns on embodiment of this invention. In the present embodiment, the seat 1 is a seat on the right side of the front seat of a vehicle such as an automobile (driver seat or passenger seat), and the width direction (left-right direction) of the seat 1 is on the vehicle floor panel. It is installed to match the width direction. The right side of the seat 1 is the outer side in the vehicle width direction and corresponds to the right side in FIGS. 1 and 2, and the left side of the seat 1 is the inner side in the vehicle width direction and corresponds to the left side in FIGS. 1 and 2. . Further, the front side of the seat 1 coincides with the front side of the vehicle, and the rear side of the seat 1 coincides with the rear side of the vehicle. Hereinafter, the front, rear, left and right of the seat 1 are simply referred to as front, rear, left and right, respectively.

  The seat 1 includes a seat cushion 2, a seat back 3, and a headrest 4. The seat back 3 is rotatably connected to an axis extending in the left-right direction via a knuckle member (not shown) provided at the rear end portion of the seat cushion 2, and the seat back 3 is connected to the seat cushion 2. The angle can be adjusted. Moreover, the seat cushion 2 can adjust the position of the vehicle front-back direction with respect to the floor panel.

  A seat back frame 11 having a substantially rectangular frame shape is disposed in the seat back 3. The seat back frame 11 protrudes upward, connecting the left and right side frames 12 and 13 extending in the vertical direction in the vicinity of the left and right side surfaces of the seat back 3 and the upper ends of the side frames 12 and 13. A circular tubular upper cross member 14 having a substantially arch shape extending in the left-right direction, and a lower cross member 15 having a circular cross section extending linearly in the left-right direction, connecting the lower ends of the side frames 12, 13. Have.

  Both the side frames 12, 13 are made of a plate material. The portions of the side frames 12 and 13 that extend from the lower ends of the side frames 12 and 13 directly below the connecting portion with the lower end of the upper cross member 14 project forward from the extended line of the lower end of the upper cross member 14. The protruding portions of both side frames 12 and 13 are provided at positions corresponding to the left and right side support portions 6 described later.

  Further, a lumbar support 21 supported by both side frames 12 and 13 is provided in the seat back 3, and the right side surface of the seat back 3 (that is, the side surface of the seat back 3 outside in the vehicle width direction) is provided. An operation lever 24 (operation member) is provided for adjusting the position of the lumbar support 21 (specifically, a lumbar support plate 22 described later) in the front-rear direction.

  The lumbar support 21 includes a lumbar support plate 22 disposed so as to stand substantially vertically at a height position substantially the same as the lumbar portion of the occupant seated on the seat 1, and a left and right end portion extending in the left-right direction. A plate support member 23 having a circular cross section is rotatably supported by both side frames 12 and 13. A central portion of the plate support member 23 in the length direction (left-right direction) is an attachment portion 23a formed in a crank shape by being eccentric with respect to both end portions, and the lumbar support plate 22 is attached to the attachment portion 23a. Attached and supported.

  The right end of the plate support member 23 protrudes slightly from the right side surface of the seat back 3 to the outside of the seat back 3 and is connected to the operation lever 24. The operation lever 24 has a base end portion 24a connected so as to rotate integrally with the plate support member 23, and an operation portion 24b extending from the base end portion 24a along the right side surface of the seat back 3. ing. When the occupant operates the operation portion 24b and rotates the operation lever 24 around the axis of the base end portion 24a (the axis of the plate support member 23), the eccentric mounting portion 23a moves in the front-rear direction. . Thus, by operating the operation lever 24, the position of the lumbar support plate 22 in the front-rear direction can be adjusted. The lumbar support plate 22 is rotatably attached to the attachment portion 23a so that the lumbar support plate 22 maintains the above-mentioned standing state when moving in the front-rear direction.

  A left side support portion (not shown) and a right side support portion 6 projecting forward (front of the vehicle) and extending in the vertical direction from the backrest surface of the central portion in the left-right direction at the left and right ends of the front surface of the seat back 3. Each is provided. When viewed from the side of the seat, the front side end of the right side support portion 6 is formed in a curved shape such that the middle portion in the vertical direction protrudes more forward than the upper end portion and the lower end portion. Further, in a cross-sectional view of the seat back 3 (see FIG. 2), the front side surface of the right side support portion 6 has a substantially triangular shape with the middle portion in the left-right direction of the right side support portion 6 as a vertex 6a. . The vertex 6a is a portion that becomes the front side end of the right side support portion 6 in the side view of the seat. Note that the left side support portion has the same shape as the right side support portion 6 (a shape symmetrical to the right side support portion 6 with respect to the center in the left-right direction of the seat back 3).

  The outer surface of the seat back 3 is composed of a skin 31. The skin 31 is composed of a plurality of parts, and includes a front side skin 31a located on the front surface of the seat back 3, a left side skin (not shown) and a right side located respectively on the left and right sides of the seat back. The side skin 31b and the back side skin 31c located in the back surface (rear surface) of the seat back 3 are included. A pad 35 is disposed immediately inside the sheet of the front side skin 31a.

  The left end of the front side skin 31a is sewn with the front end of the left side skin, and the right end of the front side skin 31a is sewn with the front end of the right side skin 31b. Further, the left end portion of the back side skin 31c is sewn with the rear end portion of the left side skin, and the right end portion of the back side skin 31c is sewn with the rear end portion of the right side skin 31b. The sewing portion 32 (see FIG. 2) between the right side end portion of the front side skin 31a and the front side end portion of the right side skin 31b is broken by the deployment pressure when the airbag bag body 41 is deployed as will be described later. It is like that.

  The right side end portion of the front side skin 31a and the front side end portion of the right side skin 31b are folded inside the sheet and overlapped with each other, and the overlapped portion is sewn together with a thread to form the sewing portion 32. Is done. The sewn portion 32 is located on the rear side with respect to the apex 6a and on the outer side (right side) in the seat width direction in a cross-sectional view of the seat back 3. In addition, the sewing portion 32 has a curved shape similar to that of the vertex 6a in a side view of the seat back 3. It should be noted that in the portion on the right side of the right side frame 13 in the seat back 3, there is no pad in the rear portion from the front and rear positions substantially the same as the sewing portion 32.

  An air bag unit 40 of the air bag device is disposed in a space where the pad does not exist, that is, a side portion (right side portion) of the seat back 3 on the outer side in the vehicle width direction. The airbag unit 40 extends in the vertical direction along the right side frame 13. The airbag unit 40 includes an airbag bag body 41 in a folded state, and an inflator 42 that extends in the vertical direction along the right side frame 13 and supplies gas to the airbag bag body 41. The inflator 42 is attached and fixed to the front side portion of the right side frame 13 (located on the inner side in the seat width direction than the rear side portion except the rear end portion of the right side frame 13) via the inflator holding member 43. Yes. That is, the inflator holding member 43 that holds the inflator 42 is provided with a stud bolt 43a. The stud bolt 43a passes through a unit holding portion 51b of the cover member 51 described later and the right side frame 13, and a nut. 44 is tightened. With this attachment structure, the inflator 42 is attached and fixed to the right side frame 13 in the seat back frame 11 together with the cover member 51.

  The airbag bag body 41 and the inflator 42 are covered with paper 45 that is broken by the deployment pressure of the airbag bag body 41, so that the folded state of the airbag bag body 41 is maintained. ing.

  The airbag device is operated by a control device (not shown) having a CPU and the like mounted on a vehicle. That is, a collision sensor (acceleration sensor or the like) that detects an impact force caused by a vehicle collision (particularly a side collision) is disposed on the vehicle body (center pillar or the like) on the right side of the vehicle. When an impact force equal to or greater than a predetermined value (a value that needs to protect the occupant) is detected by the collision sensor, the control device activates (ignites) the inflator 42, whereby the airbag bag body is moved from the inflator 42. The gas is supplied to 41, and the airbag bag body 41 is deployed toward the front side.

  A gas introduction port 41a for introducing the gas from the inflator 42 into the airbag bag body 41 at a substantially central portion in the vertical direction of the airbag bag body 41 (also a substantially central portion in the vertical direction of the airbag unit 40). Is formed (see FIG. 3). The gas introduction port 41a is located in a substantially central portion of a range where a cover member 51 described later is located in the vertical direction.

  A cover member 51 is disposed in the seat back 3 on the outer side (right side) of the airbag unit 40 in the seat width direction. In the present embodiment, the cover member 51 is made of a resin such as thermoplastic olefin (TPO). The cover member 51 is disposed so as to extend in the front-rear direction along the seat inner side surface of the right side skin 31 b in the seat back 3 on the outer side in the seat width direction than the airbag unit 40. The cover member 51 is disposed at a height position corresponding to the airbag unit 40 (substantially the same height position as the airbag unit 40), and covers the entire airbag unit 40 in a side view of the seat. . That is, the cover member 51 is disposed at a position corresponding to the vertical deployment range of the airbag bag body 41 in the seat back 3 (vertical deployment range until the airbag bag body 41 comes out of the seat back 3). It is installed.

  The cover member 51 is disposed so as to extend in the vertical direction substantially along the sewing portion 32 in a state where the front end of the cover member 51 is close to the sewing portion 32. That is, the front side end of the cover member 51 is formed in a curved shape so that the intermediate portion in the vertical direction of the cover member 51 is in front of the upper end portion and the lower end portion so as to substantially follow the sewing portion 32.

  The cover member 51 extends from the front end adjacent to the sewing portion 32 to the rear position of the airbag unit 41 and the right side frame 13 through the right side of the airbag unit 40, and the right side skin 31b. The inner side surface of the sheet and the inner side surface of the back side skin 31c sewn with the right side skin 31b extend along the seat inner side. The rear end portion of the cover member 51 is bent inward (left side) in the seat width direction and faces the rear end portion of the right side frame 13. The portions extending along the seat inner surface of the right side skin 31b and the back side skin 31c are formed as shape holding portions 51a that hold the shape of the outer surface of the seat back 3. There is no member such as a pad between the shape holding part 51a and the right side skin 31b and the back side skin 31c, and the right side skin 31b and the back side skin 31c are substantially in contact with the shape holding part 51a. (In FIG. 2, a gap is provided between the right side skin 31b and the back side skin 31c and the shape holding portion 51a for easy understanding).

  A unit holding portion 51b for holding the airbag unit 40 is formed in a portion immediately behind the airbag unit 40 on the seat inner surface of the shape holding portion 51a. The unit holding part 51b extends from the inner side surface of the shape holding part 51a to the inner side (left side) in the sheet width direction and then bends and extends to the front side along the right side frame 13. An accommodating portion 51d for accommodating the airbag unit 40 is formed between the unit retaining portion 51b and a portion of the shape retaining portion 51a on the front side of the base end of the unit retaining portion 51b (hereinafter referred to as a deformable portion 51c). The airbag unit 40 is accommodated and held in the accommodating portion 51d. When the inflator 42 is attached and fixed to the front portion of the right side frame 13 as described above, the unit holding portion 51 b of the cover member 51 is also fastened to the right side frame 13. With such a configuration, the cover member 51 can be attached to the right side frame 13 in a state where the airbag unit 40 is accommodated in the accommodating portion 51d. The right side frame 13 of the seat back frame 11 is provided with a first fixing portion to which the cover member 51 is attached.

  A protrusion 51e that contacts the rear portion of the right side frame 13 is formed on the inner side surface of the shape holding portion 51a on the rear side of the base end of the unit holding portion 51b. The tip of the protruding portion 51e does not need to be in full contact with the right side frame 13, and may have a slight gap. Further, a tightening hole 51f for tightening a nut 58 (described later) is formed through the rear end portion extending along the sheet inner surface of the back surface skin 31c in the shape holding portion 51a. Furthermore, a through hole 51g (see FIG. 1) through which the plate support member 23 penetrates is formed in a portion slightly rearward of the base end of the unit holding portion 51b in the shape holding portion 51a. The plate support member 23 protrudes outside the seat back 3 through the through hole 51g and is connected to the operation lever 24. A cover member 51 is located in the seat back 3 corresponding to the operation range of the operation lever 24. The operation lever 24 is disposed on the rear side of the airbag unit 40 on the side surface on the outer side in the vehicle width direction of the seat back 3 and on the right side of the cover member 51 (as indicated by a two-dot chain line in FIG. 2). See operating lever 24 shown).

  The shape holding portion 51a is not easily deformed even if the occupant presses the portion corresponding to the shape holding portion 51a in the right side skin 31b or the back side skin 31c to the inside of the seat, and in particular, the right side skin 31b. Since the unit holding part 51b and the protruding part 51e are in contact with the right side frame 13, the central part in the front-rear direction hardly deforms. Therefore, even if there is no pad on the right side of the right side frame 13 in the seat back 3, the shape holding portion 51a of the cover member 51 allows the side shape of the seat back 3 and a part of the back surface (airbag unit). The shape of the portion corresponding to the rear of 40) is maintained. Further, the cover member 51 is located in the seat back 3 corresponding to the operation range of the operation lever 24, and the side shape of the seat back 3 is held by the cover member 51. The operation lever 24 can be smoothly operated by rotating the operation lever 24 while keeping it along.

  The deformed portion 51c extending along the seat inner surface of the right side skin 31b extends from the side position of the airbag unit 40 toward the sewing portion 32 almost straight forward (strictly speaking, toward the front side). Slightly curved inward in the sheet width direction). Then, the deforming portion 51c receives the deploying pressure when the airbag bag body 41 is deployed, and the outside of the seat (particularly the outside in the seat width direction) is a cantilever beam whose base end is the vicinity of the rear end of the deforming portion 51c. Transforms into Due to the deformation of the deformable portion 51c, the front end of the deformable portion 51c (the front end of the cover member 51) is the end portion (front end portion) of the right side skin 31b on the side of the sewing portion 32 (front end portion) or the vicinity thereof. It is pressed to the outside in the width direction. In other words, the cover member 51 (deformed portion 51c) is configured such that the front end of the cover member 51 (the front end of the deformed portion 51c) is the end of the right side skin 31b on the sewing portion 32 side due to the deployment pressure of the airbag bag body 41. It is formed to be deformable so as to press the vicinity thereof to the outside of the seat. The deforming portion 51c may have any shape as long as it is along the inner surface of the sheet of the right side skin 31b. However, as described above, the deforming portion 51c has a linear shape that extends substantially straight in the front-rear direction. preferable. This is because when the deforming portion 51c is deformed, the front end of the deforming portion 51c is greatly deformed outward in the seat width direction and easily deformed outward in the seat width direction without disturbing the deployment of the airbag bag body 41. is there.

  In the seat back 3 on the inner side in the seat width direction than the cover member 51, a flexible low extension member 55 having a lower extension rate than the front side skin 31a is disposed. In the present embodiment, the low extension member 55 is formed of a cloth-like sheet-like member that is less likely to extend than the front side skin 31a. One end portion of the low extension member 55 is attached to the end portion (right end portion) on the sewing portion 32 side of the front side skin 31a by sewing. In the present embodiment, one end portion of the low extension member 55 is sewn to the right end portion of the front side skin 31 a using the same thread as the thread of the sewing portion 32. One end portion of the low extension member 55 may be attached to the right end portion of the front side skin 31a by sewing with a thread different from the thread of the sewing portion 32, or may be attached by, for example, bonding without using the thread. Good. Moreover, you may attach the one end part of the low expansion | extension member 55 to the vicinity of the right side edge part of the front side skin 31a.

  The low-extension member 55 traverses the front side of the airbag unit 40 from the sewing portion 32 and is located on the inner side in the seat width direction of the airbag unit 40 (the airbag unit 40 and the pad 35 on the inner side in the seat width direction of the airbag unit 40). To the rear side. Thus, the airbag unit 40 is disposed between the cover member 51 and the low extension member 55.

  The low extension member 55 passes through the inside of the right side frame 13 in the seat width direction and extends to the vicinity of the rear end portion of the right side frame 13, and the other end portion of the low extension member 55 is connected to the right side via the mounting bracket 56. It is fixedly attached to the rear end of the side frame 13. In other words, a member insertion hole 56a through which the low extension member 55 is inserted is formed at the front end of the L-shaped mounting bracket 56, and the low extension member 55 is folded after being inserted into the member insertion hole 56a. Thus, the folded portion and the portion of the low extension member 55 that faces the folded portion are sewn together. A stud bolt 57 is fixed in advance at the rear end of the right side frame 13 and protrudes rearward. On the other hand, a bolt insertion hole 56 b is formed in a portion corresponding to the stud bolt 57 of the mounting bracket 56, and the stud 58 is passed through the bolt insertion hole 56 b and a nut 58 is tightened on the stud bolt 57.

  When the nut 58 is tightened, the airbag unit 40 and the cover member 51 are already attached to the right side frame 13. This is because, in the process of manufacturing the seat 1, after the pad 35, the airbag unit 40, the cover member 51, and the like are assembled, the front side skin 31a, to which one end portion of the low-extension member 55 is attached in advance, covers the pad 35 from the front side. Because. Here, a mounting bracket 56 is attached in advance to the other end of the low extension member 55. Then, when the front side skin 31 a is put on the pad 35, the other end portion (mounting bracket 56) of the low extension member 55 is pulled from the back side of the seat to the rear side, and the stud bolt 57 is inserted into the bolt insertion hole 56 b of the mounting bracket 56. Pass through. Since a hole 51f for tightening is formed in a portion corresponding to the stud bolt 57 in the cover member 51, even if the cover member 51 covers the rear side end portion of the right side frame 13, the tool is tightened from the hole 51f for tightening. It is possible to fasten the nut 58 to the stud bolt 57 by inserting the. In this way, the other end of the low extension member 55 is attached to the right side frame 13. In the present embodiment, the right side frame 13 is provided with a first fixing portion and a second fixing portion.

  If the other end portion of the low extension member 55 is attached to the rear portion (particularly the rear end portion) of the right side frame 13 as described above, the other end portion of the low extension member 55 is connected to the right side frame 13. The attachment work can be easily performed from the back side of the seat. However, it is not always necessary to attach the other end of the low extension member 55 to the rear portion of the right side frame 13, and it may be attached to the front portion of the right side frame 13. Alternatively, the other end of the low extension member 55 may be fixed to a bracket or the like fixed to the right side frame 13.

  When the airbag bag body 41 is deployed, the low extension member 55 is pressed to the front side and the seat width direction inside by the deployment pressure. As a result, the low-stretch member 55 that is difficult to stretch is pulled by the right-side skin 31b that is pushed outward in the seat width direction by the deformed portion 51c of the cover member 51 at the end of the front-side skin 31a on the sewing portion 32 side. Restrain it so that it does not move. Therefore, the sewing part 32 between the right side skin 31b pressed by the deforming part 51c and the front side skin 31a restrained by the low extension member 55 is broken early.

  Here, as shown in FIG. 3, one end portion of the low extension member 55 is a part of the range where the front end of the cover member 51 (the front end of the deforming portion 51 c) is positioned in the vertical direction (in this embodiment, The front end of the deformable portion 51c is located at a substantially central portion) and is attached to the end portion (right end portion) of the front side skin 31a on the sewing portion 32 side so as to be along the sewing portion 32. Yes. That is, the length along the sewing portion 32 at one end of the low extension member 55 is shorter than the length along the sewing portion 32 at the front end of the deformable portion 51c. As a result, the breaking force concentrates on a part of the sewing portion 32 (the portion to which the one end portion of the low extension member 55 is attached), and the portion where the breaking force concentrates becomes the starting point of the breaking of the sewing portion 32. In the present embodiment, the entire low-extension member 55 is located in the approximate center of the range in which the cover member 51 is located in the vertical direction. As a result, the low extension member 55 passes through substantially the same height position as the gas inlet 41a of the airbag bag body 41. Note that one end of the low-extension member 55 does not necessarily need to be positioned in the substantially central portion of the range in which the front end of the deformable portion 51c is located in the vertical direction, and is in the range in which the front end of the deformable portion 51c is located. It only has to be located in part. Further, the entire length direction of the low extension member 55 does not need to be positioned in the substantially central portion of the range in which the cover member 51 is positioned in the vertical direction, and is positioned in a part of the range in which the cover member 51 is positioned. It only has to be.

  Next, the operation of the airbag device will be described.

  When the vehicle collides and an impact force of a predetermined value or more is detected by the collision sensor, the control device activates (ignites) the inflator 42. As a result, gas is generated in the inflator 42, and this gas is supplied to the airbag bag body 41 so that the airbag bag body 41 is deployed. The airbag bag body 41 breaks the front side portion of the paper 45 by its deployment pressure (gas pressure), and is inflated and deployed in the seat back 3. At this time, the airbag bag body 41 presses the deformed portion 51c of the cover member 51 outward in the seat width direction, and presses the low extension member 55 forward and inward in the seat width direction. And the said deformation | transformation part 51c deform | transforms to the sheet | seat width direction outer side by the said press by the airbag bag body 41, and the front side end of the deformation | transformation part 51c is the edge part (front side) by the side of the sewing part 32 in the right side skin 31b by this deformation | transformation. Edge) or the vicinity thereof is pressed outward in the sheet width direction. At this time, the end portion (right end portion) of the front side skin 31a on the sewing portion 32 side cannot move outward in the sheet width direction together with the right side skin 31b due to the restraint by the low extension member 55. Accordingly, the breakage of the sewing portion 32 is promoted, and the airbag bag body 41 is deployed outside the seat back 3 from the opening formed by the breakage of the sewing portion 32 (see FIG. 4).

  Further, the breaking force is concentrated on a part of the sewing part 32 to create a starting point of breaking of the sewing part 32, whereby the sewing part 32 breaks from the starting point to both the upper and lower sides and eventually the airbag bag body 41. The opening of the length which can pass is formed in the height position substantially the same as the airbag unit 40. By making the starting point of the break in this way, the break of the sewing portion 32 is further promoted, and the airbag bag body 41 can be stably deployed to the outside of the seat back 3.

  Further, since the one end portion of the low extension member 55 (that is, the starting point of breakage) is located in the substantially central portion of the range where the front side end of the cover member 51 (the front side end of the deformation portion 51c) is located in the vertical direction. The bag body 41 can be quickly deployed at a desired height position where it is desired to be deployed. That is, if the starting point of the break is on the upper side or the lower side with respect to the central part of the range where the front side end of the cover member 51 is located, the airbag bag body 41 is the starting point where the sewing part 32 opens first. Therefore, it tends to be shifted to the upper side or the lower side with respect to the desired height position at the beginning. Finally, the opening by the above breakage is formed at substantially the same height position as the airbag unit 40, and the airbag bag body 41 is deployed at a desired height position. In order to deploy the frame at a desired height position as accurately and quickly as possible, one end portion of the low extension member 55 is positioned in a substantially central portion of the range where the front end of the cover member 51 is positioned in the vertical direction. Preferably it is.

  The airbag bag body 41 developed from the opening to the outside of the seat back 3 continues to be deployed to the front side as it is, and finally the side of the occupant seated on the seat 1, that is, the occupant due to a collision. It unfolds between the vehicle body such as a door to be deformed to the side (see FIG. 1). In this deployed state, the airbag bag body 41 is located at a height position from the chest of the occupant to the lower portion of the waist and protects the chest and waist of the occupant.

  Therefore, in this embodiment, when the airbag bag body 41 breaks the sewing portion 32 by pressing the deformed portion 51c of the cover member 51 outward in the seat width direction, the low-stretch member 55 causes the front-side skin 31a to The end on the sewing part 32 side is restrained from being pulled by the side skin 31b pressed by the deforming part 51c so as not to move outward in the sheet width direction, and a part of the sewing part 32 (of the low-extension member 55) Since the rupture force is concentrated on the portion to which the one end is attached to create the starting point of the sewed portion 32, the rupture of the sewed portion 32 is promoted and the seat bag 3 outside the airbag bag body 41 is promoted. Can be deployed early and stably.

  In the above embodiment, the cover member 51 is made of resin. However, the present invention is not limited thereto, and the shape of the outer surface of the seat back 3 can be maintained, and the cover member can be driven by the deployment pressure of the airbag bag body 41. As long as the front end of 51 can be deformed so as to press the end of the right side skin 31b on the side of the sewing portion 32 or the vicinity thereof to the outside of the seat, it is composed of any material (for example, metal such as iron). Also good.

  Moreover, the shape holding part 51a of the cover member 51 may be a part having only the deformed part 51c, and there is no rear part from the base end of the unit holding part 51b in the shape holding part 51a. May be. Further, the unit holding part 51b may not be provided.

  Furthermore, in the said embodiment, although the shape holding part 51a of the cover member 51 is in the state which contacted substantially the right side skin 31b and the back side skin 31c, the shape holding part 51a of the cover member 51 and the right side skin It is also possible to interpose a member such as a pad between 31b and the back side skin 31c. In this case, no pad or the like is interposed between the front end of the deformable portion 51c and the right side skin 31b in order to bring the front end of the cover member 51 (the front end of the deformable portion 51c) close to the sewing portion 32. .

  Furthermore, the low extension member 55 is not limited to cloth, and any flexible member having a lower extension rate than the front skin 31a (preferably a sheet-like member having a small thickness from the viewpoint of space and handling) can be used. You may comprise with such a material.

  Further, as a reference form, the low extension member 55 may be disposed between a portion corresponding to the right side support portion 6 of the front side skin 31a and the pad 35 as shown in FIG. In this case, one end portion of the low extension member 55 is attached to the end portion on the sewing portion 32 side in the front side skin 31a or in the vicinity thereof, as in the above-described embodiment. A reinforcing wire 36 that extends in the vertical direction at a portion corresponding to the base end portion of the right side support portion 6 in 35 and reinforces the pad 35, or vertically outside the pad 35 on the rear side of the reinforcing wire 36. It may be attached and fixed to the reinforcing wire 37 extending in the direction (in FIG. 5, it is fixed to the reinforcing wire 36). A slit may be formed in advance in the portion of the pad 35 through which the low extension member 55 passes. In this way, when the other end of the low extension member 55 is attached and fixed to the reinforcing wire 36 or the reinforcing wire 37, it is not necessary to form the tightening hole 51 f at the rear end of the cover member 55.

  As a reference form, as shown in FIG. 6, the other end of the low extension member 55 disposed between the front side skin 31 a and the pad 35 is attached to the reinforcing wire 36 or the reinforcing wire 37 as described above. Instead of fixing, the low extension member 55 extends to the right side frame 13 after passing through a portion corresponding to the base end portion of the right side support portion 6 in the pad 35, as in the above embodiment. The other end of the low extension member 55 may be attached and fixed to the right side frame 13.

  Further, in the above embodiment, the airbag unit 40 is attached and fixed to the right side frame 13 together with the cover member 51, but separately from the cover member 51, the airbag unit 40 is attached and fixed to the right side frame 13 or the right side frame 13. It may be attached and fixed to a bracket or the like. Further, the cover member 51 can be attached and fixed to a bracket attached to the right side frame 13 (which may be the same as or different from the bracket to which the airbag unit 40 is attached).

  In the above-described embodiment, the seat on the right side of the front seat of the vehicle has been described as an example. However, the seat is not limited to this, and the seat on the left side of the front seat of the vehicle (the airbag unit is disposed on the left side portion of the seat). Or it may be a rear seat.

  According to the present invention, an airbag bag body breaks a sewing portion between a front side skin in a seat back and a side skin on the outer side in the vehicle width direction, and an opening of the seat back from an opening formed by the breaking of the sewing portion. The present invention is useful for a vehicle seat provided with an airbag device configured to be deployed outward.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 3 Seat back 11 Seat back frame 13 Right side frame 21 Lumber support 24 Control lever 31 Skin 31a Front side skin 31b Right side skin (side skin on the outer side in the vehicle width direction)
31c Back side skin 32 Sewing part 35 Pad 36 Reinforcement wire 37 Reinforcement wire 40 Airbag unit 41 Airbag bag body 42 Inflator 51 Cover member 51a Shape holding part 51b Unit holding part 51c Deformation part 51d Storage part 55 Low extension member

Claims (5)

By supplying gas to the airbag bag body from the inflator in an airbag unit that is built in the lateral side of the seat back in the vehicle width direction and includes the airbag bag body and the inflator at the time of a vehicle collision, The bag bag body breaks the sewing portion between the front side skin in the seat back and the side skin on the outer side in the vehicle width direction, and expands outside the seat back from the opening formed by the breaking of the sewing portion. A vehicle seat including an airbag device configured as described above,
A cover member disposed at a height position corresponding to the airbag unit in the seat back outside the seat width direction from the airbag unit, and attached to a first fixing portion in the seat back;
A flexible low-stretch member disposed in the seat back in the seat width direction from the cover member and having a lower stretch rate than the front-side skin;
With
The cover member is disposed so as to extend in the vertical direction substantially along the sewing portion in a state in which the sheet front side end of the cover member is close to the sewing portion. The sheet front side end of the cover member is formed so as to be deformable into a cantilever shape so as to press the end of the sewing part side in the side surface skin or the vicinity thereof to the outside of the sheet,
One end portion of the low extension member is located in a part of a range where the seat front side end of the cover member is located in the vertical direction, and is attached to an end portion of the front side skin on the sewing portion side or the vicinity thereof. On the other hand, the other end of the low extension member is attached to a second fixing portion in the seat back,
The airbag unit is disposed between the cover member and the low extension member,
The second fixing portion is located on the rear side of the seat with respect to the first fixing portion,
The low extension member is attached to the second fixing portion across the front side of the seat of the airbag unit from the one end portion attached to or near the sewing portion side end portion of the front side skin. Extending to the other end, and the deployment pressure of the airbag bag body directly acts on the portion of the low-extension member that crosses the front side of the seat of the airbag unit,
Length along the stitching portion of the one end of the low-extension member, rot even shorter than the length along the sewn portion of the seat front edge of the cover member,
The deformable portion, which is a deformable portion of the cover member in a cantilever shape, extends substantially straight from the lateral position of the airbag unit toward the sewing portion, and the airbag bag body. Is deformed into a cantilever shape with the vicinity of the sheet rear side end of the deformed portion as the base end due to the development pressure of
A vehicle seat provided with an airbag device , wherein a position serving as a base end when the deforming portion is deformed into a cantilever shape is located on the front side of the seat with respect to the second fixing portion . In the vehicle seat provided with the airbag device according to claim 1,
One end portion of the low extension member is located in a substantially central portion of a range where the seat front side end of the cover member is located in the up-down direction, and the vehicle seat provided with the airbag device. In the vehicle seat provided with the airbag device according to claim 1 or 2 ,
The cover member has a housing portion that houses the airbag unit, and is configured to be attachable to the first fixing portion in a state where the airbag unit is housed in the housing portion. A vehicle seat provided with an airbag device. In the vehicle seat provided with the airbag device according to any one of claims 1 to 3 ,
The low extension member is disposed between the airbag unit and a pad on the inner side in the seat width direction than the airbag unit,
The vehicle seat provided with an airbag device, wherein the other end portion of the low extension member is attached to a seat back frame provided with the second fixing portion. In the vehicle seat provided with the airbag device according to claim 4 ,
The vehicle seat provided with an airbag device, wherein the other end portion of the low extension member is attached to a seat rear side portion of the seat back frame.

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