JP2014012434A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular seat which can prevent a rocking member such as a seat back from falling from a base.SOLUTION: The vehicular seat includes a seat back 22 arranged to an inner wall of a vehicle body. A shaft 70 erected on the inner wall of the vehicle body is rotatably supported by a cylindrical bracket 38 arranged at the seat back. A deformation promotion portion (a boundary portion between a small diameter part 40 and a connection part 44) is formed in the bracket. The deformation promotion portion is provided at the position which does not overlap with the shaft 70 in an axial direction of the bracket. Therefore, when the seat back is distorted by vehicular crash, distortion of the deformation promotion portion is caused, the distortion of the seat back hardly impacts on the shaft because position of the deformation promotion portion is shifted from an arrangement position of the shaft. Therefore, even when the seat back is distorted by vehicular crash, the shaft can be prevented from falling from the bracket, and thereby falling of the seat back 22 can be properly prevented.

Description

  The present invention relates to a vehicle seat provided with a swinging member attached to a base so as to be swingable according to a seating mode of a seated person.

  Some vehicle seats are provided with a swinging member that is swingably attached to a base. The swinging member depends on the seating state of the seated person, specifically, the sitting posture, the presence / absence of the seating, and the like. Can be swung. Examples of the swinging member include various types such as a seat back, a seat cushion, an armrest, etc., but a seat back used for a rear seat includes one attached to a vehicle body as a base. The seat back is attached in a narrow vehicle interior. For this reason, a technique for simplifying the mounting work in a narrow vehicle interior has been developed. Specifically, in Patent Document 1 below, a technique for attaching a seat back to a vehicle body in a swingable manner by attaching a shaft to the vehicle body side and supporting the shaft in an attachment hole formed on a side surface of the seat back. Is described. With such a seat back, the seat back can be attached to the vehicle body simply by inserting the shaft into the attachment hole, and the attachment work can be simplified.

JP 9-86232 A

  According to the technique described in Patent Document 1, it is possible to easily attach the seat back to the vehicle body even in a narrow vehicle interior. However, when the vehicle collides, the seat back may be deformed. In such a case, in the seat back attached to the vehicle body by inserting the shaft into the mounting hole, the shaft is pulled out from the mounting hole, There is a risk of falling off. The present invention has been made in view of such circumstances, and it is possible to easily attach a swinging member such as a seat back to the base, and to suitably prevent the swinging member from dropping from the base. It is an object to provide a vehicle seat that can be used.

  In order to solve the above-mentioned problem, the vehicle seat according to claim 1 of the present application is provided with a swing member attached to the base so as to be swingable according to the seating mode of the seated person. The shaft portion provided on one of the base and the swing member is held rotatably around the shaft center by a cylindrical holding portion provided on the other of the base and the swing member. The holding portion has a deformation promoting portion that is easily deformed when a load is applied to the swinging member, and the deformation promoting portion is held by the holding portion in the extending direction of the holding portion. It is provided at a position that does not overlap with the part.

  The vehicle seat according to claim 2 is the vehicle seat according to claim 1, wherein the holding portion includes a diameter changing portion in which at least one of an outer diameter and an inner diameter changes, and the diameter change. The portion functions as the deformation promoting portion.

  The vehicle seat according to claim 3 is the vehicle seat according to claim 1 or 2, wherein the holding portion includes a first outer diameter portion having a predetermined outer diameter, and a first outer diameter portion thereof. A second outer diameter portion that is continuous from the diameter portion and has an outer diameter larger than the outer diameter of the first outer diameter portion. In the first outer diameter portion, on the other of the base and the swing member A portion of the second outer diameter portion that holds the shaft portion and continues from the first outer diameter portion to the second outer diameter portion functions as the deformation promoting portion.

  In the vehicle seat according to claim 1, the shaft portion provided on one of the swing member and the base is rotatably held by the holding portion provided on the other, so that the swing member is the base. Is attached to be swingable. Thus, the swing member can be attached to the base simply by inserting the shaft portion into the holding portion, and the attachment work can be simplified.

  Further, in the vehicle seat according to the first aspect, a deformation promoting portion that is easily deformed when a load is input to the swing member is formed in the holding portion. And the deformation | transformation promotion part is provided in the position which does not overlap with the axial part of the state hold | maintained by the holding | maintenance part in the extension direction of a holding | maintenance part. That is, the arrangement position of the shaft portion held by the holding portion and the formation position of the deformation promoting portion are misaligned in the extending direction of the holding portion. For this reason, when the swinging member is deformed by the collision of the vehicle, the deformation promoting portion of the holding portion is deformed. However, the formation position of the deformation promoting portion is displaced from the position where the shaft portion is disposed. The deformation of the moving member hardly affects the shaft portion. Therefore, according to the vehicle capacity seat of the first aspect, even if the swinging member is deformed due to the collision of the vehicle, it is possible to prevent the shaft from being pulled out from the mounting hole. It is possible to suitably prevent the dropout.

  In the vehicle seat according to the second aspect, the cylindrical holding portion has a shape in which at least one of the outer diameter and the inner diameter changes, and the portion where the diameter changes functions as a deformation promoting portion. As a result, when the swinging member is deformed due to the collision of the vehicle, the deformation promoting portion of the holding portion can be reliably deformed, and the shaft can be appropriately prevented from being pulled out from the mounting hole.

  In the vehicle seat according to claim 3, the holding portion includes a first outer diameter portion having a predetermined outer diameter and a second outer diameter portion having an outer diameter larger than the outer diameter of the first outer diameter portion. The shaft portion is held in the second outer diameter portion. Then, a portion continuous from the first outer diameter portion to the second outer diameter portion, that is, a boundary portion between the first outer diameter portion and the second outer diameter portion functions as a deformation promoting portion. As a result, the holding portion can be deformed without affecting the shaft portion held by the second outer diameter portion, and it is possible to appropriately prevent the shaft from being pulled out from the mounting hole.

It is a perspective view which shows the vehicle seat which is the Example of this invention. It is a side view which shows the state which made the seat back of the vehicle seat shown in FIG. It is sectional drawing in the AA line shown in FIG. It is an expanded sectional view of the resin cap of the state holding the axis. It is sectional drawing which shows the fixture for attaching a seat back to the floor of a vehicle body so that rocking | fluctuation is possible. It is a perspective view which shows the fixture for attaching a seat back to the floor of a vehicle body so that rocking | fluctuation is possible. It is sectional drawing which shows a seat back when a seat back deform | transforms.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as modes for carrying out the present invention.

<Configuration of vehicle seat>
FIG. 1 shows a vehicle seat 10 according to an embodiment of the present invention. The vehicle seat 10 is a seat used as a rear seat of the vehicle, a so-called rear seat, and is a split-foldable seat that can divide the seat back and fold it down independently. Specifically, the vehicle seat 10 includes a seat cushion 20 disposed over the entire vehicle width direction, a narrow right seat back 22 provided in a right-side portion of the seat cushion 20, and a seat. A wide left seat back 24 is provided in the left part of the cushion 20 so as to be able to fall down, and headrests 26 and 28 are provided in the right seat back 22 and the left seat back 24, respectively. In addition, the left-right direction in an Example is a direction in a passenger | crew's viewpoint in the state seated on the vehicle seat 10. FIG. That is, the direction toward the upper left in FIG. 1 is the right direction in the embodiment, and the direction toward the lower right in FIG. 1 is the left direction in the embodiment.

  The seat cushion 20 is fixedly provided on a floor (see FIG. 2) 30 of the vehicle body. On the other hand, each of the right seat back 22 and the left seat back 24 is swingably provided on the vehicle body, and as shown in FIG. 2, a standing state (solid line) and a forward-turning state (two-dot chain line) It is possible to change the posture between. Incidentally, each of the right seat back 22 and the left seat back 24 is provided with a fixing mechanism (not shown) for fixing the seat backs 22 and 24 in an upright state. By releasing the fixing of 22 and 24, the seat backs 22 and 24 can be swung forward to be brought forward.

  Here, the mounting structure of the seatbacks 22 and 24 to the vehicle body will be described in detail. The mounting structure of the right seatback 22 to the vehicle body and the mounting structure of the left seatback 24 to the vehicle body are symmetrical. Except for, it is almost the same. For this reason, the structure for attaching the right seat back 22 to the vehicle body will be described as a representative.

  As shown in FIG. 3 which is a cross-sectional view of the right seat back 22 in a state where the right seat back 22 is erected along the line AA shown in FIG. 2, the right seat back 22 and the left back A frame (see FIG. 5) 33, a back pad 34 disposed on the side of the right back frame 32 and the left back frame 33 on which a passenger is seated, and a back panel surrounding the back surfaces of the right back frame 32 and the left back frame 33 36 and a seat side bracket 38 extending to the right side of the right seat back 22.

  The seat-side bracket 38 has a generally cylindrical shape, and includes a small diameter portion 40, a large diameter portion 42 having an outer diameter larger than the outer diameter of the small diameter portion 40, and a connecting portion that connects the small diameter portion 40 and the large diameter portion 42. 44. The seat side bracket 38 is fixed to the right back frame 32 at the base end portion of the small diameter portion 40, and the distal end portion of the large diameter portion 42 is located on the right side surface of the right seat back 22.

  An inner flange portion 46 that extends radially inward is formed at the distal end portion of the large diameter portion 42, and a generally annular resin cap 50 that covers the inner edge of the inner flange portion 46 is attached to the inner flange portion 46. It has been. The resin cap 50 is formed of a resin material, and includes a main body portion 54 in which a mounting hole 52 is formed at a central portion, and a boss portion 56 erected so as to surround the mounting hole 52. . As shown in FIG. 4, a concave portion 58 is formed on the outer peripheral surface of the boss portion 56 over the entire circumference, and the inner edge of the inner flange portion 46 is hooked on the concave portion 58, whereby the resin cap 50 is seated. The side bracket 38 is swingably attached.

  Specifically, the recess 58 is configured by two taper surfaces that are high in the width direction thereof, that is, in the extending direction of the boss portion 56 and are inclined toward both ends of the recess 58 in the width direction. . Further, the inner diameter of the inner edge of the inner flange portion 46 is substantially the same as the outer diameter of the central portion in the width direction of the concave portion 58, and the inner edge of the inner flange portion 46 is in the central portion in the width direction of the concave portion 58. Line contact. For this reason, the resin cap 50 can swing around the central portion in the width direction of the recess 58, that is, around the apexes of the two taper surfaces, as shown by the two-dot chain line in FIG. It is said that.

  Further, the outer diameter of the main body portion 54 of the resin cap 50 is larger than the outer diameter of the large diameter portion 42 of the seat side bracket 38, and the right side of the seat side bracket 38 is covered by covering the tip end portion of the large diameter portion 42. Exposure from the side surface of the seat back 22 is prevented. A taper surface 60 that is inclined toward the inside of the mounting hole 52 is formed on the side surface side of the right seat back 22 of the main body portion 54 of the resin cap 50.

  As shown in FIG. 3, a shaft 70 provided on the inner wall of the vehicle body is inserted into the mounting hole 52, and the right seat back 22 is pivotally supported by the shaft 70. Specifically, the shaft 70 is bolted to a body side bracket 74 fixed to the wheel house frame 72 at the base end portion, and extends into the vehicle interior via a through hole 78 formed in the trim 76. Yes. The shaft 70 extending into the passenger compartment is inserted into the mounting hole 52 of the resin cap 50 that covers the front end portion of the seat side bracket 38, and the front end portion of the shaft 70 is large with the connecting portion 44 of the seat side bracket 38. It is located at the boundary with the diameter portion 42. Thus, the shaft 70 is rotatably held by the seat side bracket 38 via the resin cap 50, and the right seat back 22 is swingably attached to the inner wall of the vehicle body.

  Further, as shown in FIG. 5, a shaft 82 is provided on the left side surface of the right seat back 22, and the right seat back 22 is attached to the shaft 82 by a fixture 84 provided on the floor of the vehicle body. It is pivotally supported. Specifically, an L-shaped seat side bracket 86 is fixed to the left back frame 33 of the right seat back 22. A shaft 82 is fixedly erected on the seat side bracket 86 and extends from the left side surface of the right seat back 22.

  As shown in FIG. 6, the fixture 84 that supports the shaft 82 extending from the left side surface of the right seat back 22 includes a floor fixing portion 88 that is fixed to the floor of the vehicle body, and the shaft 82. And a lid portion 92 that covers the shaft support portion 90. The shaft support 90 is formed with a notch 96 slightly larger than the outer diameter of the shaft 82, and the shaft 82 is supported by the notch 96 so that the right seat back 22 is supported by the fixture 84. The The lid portion 92 is provided on the shaft support portion 90 so as to be openable and closable, and the upper portion of the shaft support portion 90 that supports the shaft 82 in the notch portion 96 is covered with the lid portion 92.

  Incidentally, the left seat back 24 is also attached to the fixture 84, and as shown in FIG. 5, a shaft 98 erected on the right side surface of the left seat back 24 is connected to the right seat back 22. It is supported at the notch 96 of the shaft support 90 in a state of facing the shaft 82 erected on the left side surface.

<Attaching the vehicle seat to the vehicle body>
The attachment procedure when the vehicle seat 10 having the above structure is attached to the vehicle body in the vehicle manufacturing stage will be described in detail. First, the operator holds the right seat back 22 in the vehicle interior, and inserts the shaft 70 protruding from the inner wall of the vehicle body into the vehicle interior in the mounting hole 52 of the resin cap 50 attached to the right side of the right seat back 22. Insert into.

  After inserting the shaft 70 into the mounting hole 52, the shaft 82 erected on the left side surface of the right seat back 22 is hooked on the notch 96 of the shaft support 90 of the mounting tool 84 fixed on the floor of the vehicle body. . Then, the upper opening of the shaft support portion 90 in a state in which the shaft 82 is supported is closed by the lid portion 92, and the shaft support portion 90 and the lid portion 92 are fastened by a bolt. Accordingly, the right seat back 22 is attached to the vehicle body so as to be swingable.

  In this way, the shaft 70 erected on the inner wall of the vehicle body is inserted into the mounting hole 52 formed on one side surface of the right seat back 22, and the shaft 82 erected on the other side surface is connected to the floor of the vehicle body. The right seat back 22 can be attached to the vehicle body simply by hooking it onto the fixture 84 fixed to the vehicle body. In particular, a taper surface 60 that is inclined toward the inside of the mounting hole 52 is formed in the resin cap 50 in which the mounting hole 52 is formed. Therefore, the operator can insert the shaft 70 into the mounting hole 52 along the taper surface 60. Thus, the operator can appropriately insert the shaft 70 into the mounting hole 52 even in a situation where it is difficult to visually check the mounting hole 52.

  More specifically, the resin cap 50 into which the shaft 70 is inserted is swingable as described above. For this reason, even if the extending direction of the shaft 70 does not match the extending direction of the seat side bracket 38, the shaft 70 can be inserted into the mounting hole 52 of the resin cap 50 by swinging the resin cap 50. It is possible. Accordingly, the operator can insert the shaft 70 into the mounting hole 52 without making the extending direction of the shaft 70 and the extending direction of the seat side bracket 38 coincide with each other, thereby making the mounting work easier. Is possible.

<Deformation of seat back at the time of vehicle collision>
In the vehicle seat 10 having the above structure, the right seat back 22 is attached to the vehicle body by inserting the shaft 70 into the attachment hole 52. For this reason, when a collision or the like occurs in the vehicle, the right seat back 22 is deformed and the shaft 70 is pulled out from the seat side bracket 38, so that there is a concern that the right seat back 22 falls off. However, in the vehicle seat 10, when a collision or the like occurs in the vehicle, even if the right seat back 22 is deformed, a portion different from the portion that holds the shaft 70 of the seat side bracket 38 is deformed. 70 is not pulled out from the seat side bracket 38.

  Specifically, as described above, the seat-side bracket 38 that holds the shaft 70 includes the small-diameter portion 40, the large-diameter portion 42, and the connecting portion 44, and there are portions where the outer diameter and the inner diameter change. For this reason, when a collision or the like occurs in the vehicle, the acceleration in the front-rear direction of the seat occupant changes suddenly, and a large load is input to the right seat back 22, the portion where the outer diameter and inner diameter change is deformed. To do. Specifically, a load is applied to the boundary portion between the small diameter portion 40 and the connecting portion 44, and the boundary portion is deformed.

  On the other hand, the boundary portion between the small diameter portion 40 and the connecting portion 44 is provided at a position that does not overlap the shaft 70 in the extending direction of the seat side bracket 38. That is, the arrangement position of the shaft 70 and the boundary portion between the small diameter portion 40 and the connecting portion 44 are shifted in the extending direction of the seat side bracket 38. For this reason, when the right seat back 22 is deformed due to the collision of the vehicle, as shown in FIG. 7, the boundary portion between the small diameter portion 40 and the connecting portion 44 is deformed, but the large diameter portion 42 holding the shaft 70. Does not deform. For this reason, the holding state of the shaft 70 by the seat side bracket 38 is maintained. Thereby, in the vehicle seat 10, it is possible to prevent the shaft 70 from being pulled out from the mounting hole 52 at the time of a vehicle collision, and it is possible to prevent the right seat back 22 from falling off. In FIG. 7, the back pad 34, the back panel 36, and the like are omitted.

  Incidentally, in the above-described embodiment, the vehicle seat 10 is an example of a vehicle seat, and the right seat back 22 and the left seat back 24 constituting the vehicle seat 10 are examples of swing members. The seat side bracket 38 and the shaft 70 are examples of a holding portion and a shaft portion. The small diameter portion 40 of the seat side bracket 38 is an example of a first outer diameter portion, and the one constituted by the large diameter portion 42 and the connecting portion 44 is an example of a second outer diameter portion. The boundary portion between the small diameter portion 40 and the connecting portion 44 is an example of a diameter changing portion and an example of a deformation promoting portion. The inner wall of the vehicle body, specifically, the body side bracket 74 is an example of a base.

  In addition, this invention is not limited to the said Example, It can implement in the various aspect which gave various change and improvement based on the knowledge of those skilled in the art. Specifically, in the above embodiment, the boundary portion between the small diameter portion 40 and the connecting portion 44, that is, the portion where the diameter of the seat side bracket 38 changes is functioned as the deformation promoting portion. By applying to the side bracket 38, the processed part may function as a deformation promoting part. For example, each processed portion may function as a deformation promoting portion by forming a thin portion, a notch portion, a constricted portion, or the like in the seat side bracket 38. Alternatively, a part of the seat side bracket 38 may be formed of a material that is easily deformed, and a part of the seat side bracket 38 may function as a deformation promoting portion.

  In the above embodiment, the seat back is adopted as the swinging member, but various members constituting the vehicle seat, such as a seat cushion, an armrest, etc., can be adopted. In addition, when a seat cushion is employed as the swing member, it is desirable to employ the floor of the vehicle body as the base, and when an armrest is employed as the swing member, the seat back is employed as the base. It is desirable.

  In the above embodiment, the seat back bracket 38 as the holding portion is provided in the seat back as the swing member, and the shaft 70 as the shaft portion is provided in the vehicle body as the base. The holding part may be provided on the base. In the above embodiment, the small diameter portion 40 as the first outer diameter portion is fixed to the right back frame 32, and the shaft 70 is held by the large diameter portion 42 as the second outer diameter portion. The diameter portion may be fixed to the right back frame 32, and the shaft 70 may be held by the first outer diameter portion.

10: Vehicle seat 22: Right seat back (swing member)
24: Left seat back (swing member)
38: Seat side bracket (holding part)
40: Small diameter part (first outer diameter part) (deformation promoting part) (diameter changing part)
42: Large diameter portion (second outer diameter portion)
44: Connecting part (second outer diameter part) (deformation promoting part) (diameter changing part)
70: Shaft (shaft)

Claims (3)

In the vehicle seat provided with a swinging member attached to the base so as to be swingable according to the seating mode of the seated person,
A shaft portion provided on one of the base and the swing member is held rotatably around an axis by a cylindrical holding portion provided on the other of the base and the swing member,
The holding part is
A deformation promoting portion that easily deforms when a load is input to the swing member;
The deformation promoting part is
A vehicle seat, wherein the vehicle seat is provided at a position that does not overlap the shaft portion held by the holding portion in a direction in which the holding portion extends. The holding part is
Having a diameter changing portion in which at least one of the outer diameter and the inner diameter changes,
The diameter changing portion is
The vehicle seat according to claim 1, wherein the vehicle seat functions as the deformation promoting portion. The holding part is
A first outer diameter portion having a predetermined outer diameter, and a second outer diameter portion continuous from the first outer diameter portion and having an outer diameter larger than the outer diameter of the first outer diameter portion, In one outer diameter portion, provided on the other of the base and the swing member, in the second outer diameter portion, the shaft portion is held,
A portion that continues from the first outer diameter portion to the second outer diameter portion,
The vehicle seat according to claim 1, wherein the vehicle seat functions as the deformation promoting portion.

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