JP2015003674A - Bracket fixing structure of seat back frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the support rigidity to a bracket by using a simple structure.SOLUTION: In a vehicle seat 10 to which a bracket fixing structure S of a seat back frame 20 is applied, a first fixing part 30 and a second fixing part 32 are integrally formed at the seat back frame 20. The first fixing part 30 is formed into a recessed shape that opens to the seat front side in a plane view and fixes an upper part of a bracket 40. The second fixing part 32 is formed into a recessed shape that opens to the seat rear side in the plane view and fixes a lower part of the bracket 40. Thus, the seat back frame 20 supports two portions of the bracket 40 from different directions to improve the support rigidity to the bracket 40. Further, the structure eliminates the need for forming the first fixing part 30 and the second fixing part 32 into, for example, cylindrical shapes. Thus, the first fixing part 30 and the second fixing part 32 are formed into simple shapes at the seat back frame 20 formed by a resin material.

Description

  The present invention relates to a bracket fixing structure for a seat back frame.

  The seat back frame described in the following Patent Document 1 includes a metal frame and a resin frame. And the supporting member (bracket) which supports a headrest is being fixed to the metal frame in the rear part.

Japanese Patent No. 4725135 JP 2012-232731 A

  By the way, in recent years, the entire seat back frame may be made of resin for the purpose of weight reduction or the like. In this case, it is necessary to fix the support member to the resin seat back frame. However, when the fixing structure is applied to a resin seat back frame, the support member is fixed to the seat back frame only at the rear portion thereof, and thus the support rigidity to the support member may be lowered. In consideration of the moldability of the resin seat back frame, it is desirable that the portion for fixing the support member has a simple shape.

  In view of the above fact, an object of the present invention is to provide a bracket fixing structure for a seat back frame that can improve support rigidity for a bracket with a simple structure.

  The bracket structure for fixing a seat back frame according to claim 1 comprises a skeleton member of the seat back, and is formed integrally with the seat back frame made of a resin material and the seat back frame, and in front of the seat in a plan view. A concave portion opened to the side, and a first fixing portion that is fixed in a state in which a bracket that supports the headrest is disposed on the inside, and is formed integrally with the seat back frame on the seat lower side of the first fixing portion, And a second fixing portion configured to fix the bracket disposed on the inner side while forming a concave shape opened to the rear side of the seat in a plan view.

  In the bracket fixing structure for the seat back frame according to the first aspect, the seat back frame constituting the skeleton member of the seat back is made of a resin material. And the bracket which supports a headrest is being fixed to the seat back frame. Thereby, the headrest is supported by the seat back frame via the bracket.

  Here, the first fixed portion and the second fixed portion are integrally formed on the seat back frame. And the 1st fixing | fixed part is fixing to the bracket arrange | positioned inside the 1st fixing | fixed part while it is formed in the concave shape open | released to the sheet | seat front side by planar view. The second fixing portion is formed in a concave shape opened to the rear side of the seat in a plan view on the lower side of the seat of the first fixing portion, and fixes the bracket disposed inside the second fixing portion. Yes. For this reason, the bracket is supported from the rear side of the seat by the first fixing portion, and is supported from the front side of the seat by the second fixing portion. Thereby, since the seat back frame supports the two portions of the bracket from different directions, the support rigidity with respect to the bracket can be increased, and as a result, the support rigidity with respect to the headrest can be increased.

  In particular, the bracket can be effectively supported against the load from the seated occupant's head to the seat rear side acting on the headrest. That is, when a load on the rear side of the seat acts on the headrest, a rotational moment is generated in the bracket so that the upper portion of the bracket tilts obliquely downward after the seat. For this reason, a load to the rear side of the seat mainly acts on the upper portion of the bracket, and a load to the front side of the seat mainly acts on the lower portion of the bracket. On the other hand, the seat back frame is mounted on the bracket so that the first fixed portion receives a load on the rear side of the seat that acts on the bracket, and the second fixed portion receives a load on the front side of the seat that acts on the bracket. Support. Thus, the bracket can be effectively supported by the seat back frame against the load on the seat rear side acting on the headrest.

  Further, as described above, the first fixing portion is formed in a concave shape opened to the front side of the seat in plan view, and the second fixing portion is formed in a concave shape opened to the rear side of the seat in plan view. . For this reason, it is not necessary to form the 1st fixed part and the 2nd fixed part in the cylinder shape penetrated to a sheet up-and-down direction, for example. Thereby, a 1st fixing | fixed part and a 2nd fixing | fixed part can be comprised with a simple shape with respect to the seat back frame comprised with the resin material. As described above, the support rigidity for the bracket can be improved with a simple structure.

  According to the bracket structure for fixing the seat back frame according to the first aspect, the support rigidity for the bracket can be improved with a simple structure.

It is the typical perspective view which looked at the seat back frame used for the vehicular seat to which the bracket fixing structure of the seat back frame concerning this embodiment was applied from the seat left slanting front. FIG. 2 is a schematic cross-sectional view (a cross-sectional view at the position of line 2-2 in FIG. 1) viewed from the left side of the seat showing a state in which the headrest is supported by a bracket fixed to the seat back frame shown in FIG. 1. (A) is the typical sectional view (the 3A-3A line sectional view of Drawing 1) seen from the seat lower part which shows the state where the bracket was fixed to the 1st fixed part of the seat back frame shown in Drawing 1. , (B) is a schematic cross-sectional view (cross-sectional view taken along line 3B-3B in FIG. 1) viewed from below the seat, showing a state in which the bracket is fixed to the second fixing portion of the seat back frame shown in FIG. is there.

  Hereinafter, the bracket fixing structure S of the seat back frame 20 according to the present embodiment will be described with reference to FIGS. The bracket fixing structure S of the seat back frame 20 is applied to a vehicle seat 10 mounted on a vehicle (automobile). Note that an arrow FR appropriately shown in the drawings indicates the front of the seat, an arrow UP indicates the upper portion of the seat, and an arrow LH indicates the left side of the seat (one side in the seat width direction). The front of the seat, the upper part of the seat, and the left side of the seat correspond to the front of the vehicle, the upper side of the vehicle, and the left side of the vehicle, respectively.

  The vehicle seat 10 is a front seat provided in the front part of the vehicle interior of the vehicle. As shown in FIG. 2, the vehicle seat 10 includes a seat back 12 that supports the back of a seated occupant, and the seat back 12 stands at the rear end of a seat cushion (not shown) on which the occupant sits. It is provided in the state. A headrest 14 that supports the head of the seated occupant is provided above the seatback 12. The headrest 14 is supported by the seatback 12.

  Inside the seat back 12, a seat back frame 20 that constitutes a skeleton member of the seat back 12 is provided. The seat back frame 20 is made of a resin material (for example, carbon fiber reinforced plastic) and is formed in a so-called shell shape (specifically, a concave shape opened to the front side of the seat) as a whole ( (See FIG. 1). A seat back pad 16 made of a foam material such as urethane is provided on the seat front side of the seat back frame 20, and the seat back pad 16 is covered with a skin 18.

  As shown in FIG. 1, the seat back frame 20 includes a back panel portion 22 that constitutes a central portion of the seat back frame 20, and a pair of side frame portions 24 that constitute both side portions of the seat back frame 20 in the seat width direction. The upper frame portion 26 that constitutes the upper portion of the seat back frame 20 is included. The back panel portion 22 is formed in a substantially rectangular plate shape, and is disposed with the plate thickness direction being substantially the seat front-rear direction. The side frame portion 24 is formed in a substantially long plate shape with the vertical direction of the seat as a longitudinal direction, and extends from both ends of the back panel portion 22 in the seat width direction to the seat front side and the seat width direction outside. The upper frame portion 26 is formed in a substantially long plate shape whose longitudinal direction is the sheet width direction, and extends from the upper end of the back panel portion 22 to the upper side of the seat. The both sides of the upper frame portion 26 in the seat width direction are smoothly connected to the upper portion of the side frame portion 24.

  Further, an attachment portion 28 is formed integrally with the lower ends of the pair of side frame portions 24. The attachment portion 28 is formed in a concave shape that protrudes inward in the seat width direction from the side frame portion 24 and opens outward in the seat width direction. A conventionally known reclining mechanism (not shown) or the like is attached in the attachment portion 28, and the seat back frame 20 is connected to a skeleton member (not shown) of the seat cushion.

  Further, a pair of first and second fixing portions 30 and 32 for fixing the bracket 40 that supports the headrest 14 are integrally formed on the upper portion of the seat back frame 20.

  The first fixing portion 30 is formed at the upper end portion of the upper frame portion 26. As shown in FIG. 3A, the first fixing portion 30 is formed in a substantially concave shape opened to the front side of the seat in plan view, extends in the vertical direction of the seat, and extends from the upper frame portion 26 to the rear of the seat. It protrudes to the side. Specifically, the first fixing portion 30 includes a first bottom wall portion 30A in which the plate thickness direction is the front-rear direction of the seat, and a pair extending substantially vertically from the both ends of the first bottom wall portion 30A to the seat front side. And the front end portions of the pair of first side wall portions 30B are coupled to the upper frame portion 26.

  As shown in FIGS. 1 and 3B, the second fixing portion 32 is disposed on the upper end portion of the back panel portion 22 and on the lower side of the seat of the first fixing portion 30. The second fixing portion 32 is formed in a substantially concave shape opened to the seat rear side in plan view, extends in the seat vertical direction, and protrudes from the rear panel portion 22 to the seat front side. Specifically, the second fixing portion 32 includes a second bottom wall portion 32A in which the plate thickness direction is the front-rear direction of the seat, and a pair extending substantially rearward from the both ends of the second bottom wall portion 32A in the seat width direction. A second side wall portion 32B, and rear end portions of the pair of second side wall portions 32B are coupled to the back panel portion 22.

  As shown in FIG. 1, the lower end portion of the second bottom wall portion 32 </ b> A and the back panel portion 22 are connected by an inclined wall portion 34. The inclined wall portion 34 is inclined toward the seat rear side toward the seat lower side in a side view, and both ends of the inclined wall portion 34 in the sheet width direction are coupled to the second side wall portion 32B.

  Furthermore, the width dimension W1 in the sheet width direction inside the first fixed portion 30 (see FIG. 3A) is the width dimension W2 in the sheet width direction inside the second fixed portion 32 (see FIG. 3B). Are set to the same dimensions. In addition, the first fixing portion 30 and the second fixing portion 32 that form a pair in the sheet vertical direction are disposed at the same position in the sheet width direction. That is, the first side wall part 30B and the second side wall part 32B arranged in the vertical direction of the sheet are arranged on the same plane. Further, the first bottom wall portion 30A is disposed on the seat rear side from the second bottom wall portion 32A. Thereby, when viewed from above the seat, the region surrounded by the first fixing portion 30 and the second fixing portion 32 forms a substantially rectangular shape. Furthermore, a substantially rectangular hole 36 penetrating in the front-rear direction of the seat is formed in the upper frame portion 26 between the first fixing portion 30 and the second fixing portion 32.

  A bracket 40 for supporting the headrest 14 is fixed to the first fixing portion 30 and the second fixing portion 32. The bracket 40 is formed in a substantially rectangular cylindrical shape, and is arranged with the vertical direction of the seat as the longitudinal direction. A part of the upper portion of the bracket 40 (the portion on the sheet upper side from the central portion of the bracket 40 in the vertical direction of the seat) is disposed in the first fixing portion 30 and the adhesive 42 (see FIG. 3A) is interposed. The first fixing part 30 is fixed. Further, a part of the lower portion of the bracket 40 (a portion of the bracket 40 on the lower side of the seat in the vertical direction of the seat) is disposed in the second fixing portion 32 via the adhesive 42 (see FIG. 3A). The second fixing portion 32 is fixed.

  Further, as shown in FIG. 2, a substantially cylindrical headrest support 44 is inserted into the bracket 40, and the headrest support 44 is held in the bracket 40. In the headrest support 44, stays 46 protruding from the headrest 14 to the seat lower side are respectively inserted, and the stays 46 are supported by the headrest support 44. Thereby, the headrest 14 is supported by the seat back frame 20 via the headrest support 44 and the bracket 40.

  Next, the operation and effect of the present embodiment will be described.

  In the vehicle seat 10 configured as described above, the seat back frame 20 is formed of a resin material. A bracket 40 is fixed to the seat back frame 20, and a headrest support 44 is held in the bracket 40. A stay 46 protruding from the headrest 14 is supported in the headrest support 44. Thereby, the headrest 14 is supported by the seat back frame 20 via the headrest support 44 and the bracket 40.

  Here, the seat back frame 20 is integrally formed with a first fixing portion 30 and a second fixing portion 32. The first fixing part 30 is formed in a concave shape opened to the front side of the seat in plan view, and the upper part (a part of) the bracket 40 is disposed inside the first fixing part 30, and the first fixing part 30. It is fixed to. Further, the second fixing portion 32 is formed in a concave shape opened to the rear side of the seat in a plan view, and a lower portion (a part thereof) of the bracket 40 is disposed inside the second fixing portion 32 to be second fixed. It is fixed to the part 32. For this reason, while the upper part of the bracket 40 is supported by the 1st fixing | fixed part 30 from a sheet | seat back side, the lower part of the bracket 40 is supported by the 2nd fixing | fixed part 32 from the sheet | seat front side. Accordingly, since the seat back frame 20 supports the two portions of the bracket 40 from different directions, the support rigidity of the seat back frame 20 with respect to the bracket 40 can be increased, and as a result, the support rigidity with respect to the headrest 14 can be increased. it can.

  In particular, the bracket 40 can be effectively supported against a load from the seated occupant's head to the seat rear side acting on the headrest 14. That is, since the bracket 40 is disposed on the lower side of the seat of the headrest 14, when a load on the rear side of the seat acts on the headrest 14, the bracket 40 has a rotational moment that causes the upper portion of the bracket 40 to fall obliquely downward after the seat. Arise. For this reason, the load on the rear side of the seat mainly acts on the upper portion of the bracket 40, and the load on the front side of the seat mainly acts on the lower portion of the bracket 40. On the other hand, the second fixing portion 32 receives the load on the front side of the seat that acts on the lower portion of the bracket 40 so that the first fixing portion 30 receives the load on the rear side of the seat that acts on the upper portion of the bracket 40. As described above, the seat back frame 20 supports the bracket 40. Thus, the bracket 40 can be effectively supported by the seat back frame 20 against the load on the seat rear side acting on the headrest 14.

  Further, at the time of rear collision of the vehicle, the head of the seated occupant moves to the rear side of the seat due to inertial force, and a collision load from the head of the occupant to the headrest 14 acts on the rear side of the seat. For this reason, at the time of a rear collision of the vehicle, the head load of the occupant who receives the collision load efficiently by the first fixing portion 30 and the second fixing portion 32 and moves rearward of the seat can be supported by the headrest 14.

  Further, as described above, the first fixing portion 30 is formed in a concave shape opened to the front side of the seat in plan view, and the second fixing portion 32 is formed in a concave shape opened to the rear side of the seat in plan view. ing. For this reason, it is not necessary to form the 1st fixing | fixed part 30 and the 2nd fixing | fixed part 32 in the cylinder shape which penetrates a sheet | seat up-down direction, for example. Thereby, the 1st fixing | fixed part 30 and the 2nd fixing | fixed part 32 can be comprised with a simple shape with respect to the seat back frame 20 comprised with the resin material. As described above, in the seat back frame 20, the support rigidity with respect to the bracket 40 can be improved with a simple structure.

  In the present embodiment, the first fixing portion 30 is formed in a concave shape opened to the front side of the seat in a plan view, and the second fixing portion 32 is a concave shape opened to the rear side of the seat in a plan view. However, the shapes of the outer peripheral portions of the first fixed portion 30 and the second fixed portion 32 can be arbitrarily set. That is, the “first fixing portion 30 (second fixing portion 32) having a concave shape opened to the front side (rear side) of the seat in a plan view” of the present invention refers to at least the first fixing portion 30 (the first fixing portion 30 in the plan view). (2) The inside of the fixed portion 32) may be formed in a concave shape opened to the front side of the seat (back side of the seat).

  Moreover, in this Embodiment, although the inner side of the 1st fixing | fixed part 30 (2nd fixing | fixed part 32) is formed in the concave shape which comprises a substantially rectangle by planar view, the 1st fixing | fixed part 30 (2nd fixing | fixed part 32) The shape inside is not limited to this. For example, the inner side of the first fixing part 30 (second fixing part 32) may be formed in a concave shape that is substantially semicircular in plan view. In this case, for example, the bracket 40 may be formed in a cylindrical shape corresponding to the inner shape of the first fixing portion 30 (second fixing portion 32).

  Further, in the present embodiment, the hole portion 36 is formed in the upper frame portion 26 between the first fixing portion 30 and the second fixing portion 32, but the hole portion 36 may be omitted. That is, the first side wall 30B of the first fixing part 30 and the second side wall 32B of the second fixing part 32 arranged in the vertical direction of the seat may be coupled.

  In the present embodiment, the bracket 40 is fixed to the first fixing portion 30 and the second fixing portion 32 via the adhesive 42. Instead of this, the seat back frame 20 is made of a thermoplastic resin material, and the bracket 40 and the seat back frame 20 are integrally formed, whereby the bracket 40 is integrated with the first fixing portion 30 and the second fixing portion 32. It may be fixed to.

  Furthermore, in the present embodiment, the bracket fixing structure S of the seat back frame 20 is applied to the front seat, but the bracket fixing structure S of the seat back frame 20 may be applied to the rear seat of the vehicle.

12 Seat back 14 Headrest 20 Seat back frame 30 First fixing part 32 Second fixing part 40 Bracket S Bracket fixing structure of the seat back frame

Claims (1)

The seat back frame, which is a skeleton member of the seat back, is made of resin material;
A first fixing portion that is formed integrally with the seat back frame and has a concave shape opened to the front side of the seat in a plan view, and is fixed in a state in which a bracket that supports the headrest is disposed inside;
A second fixing portion that is integrally formed with the seat back frame on the lower side of the seat of the first fixing portion, has a concave shape that is open to the rear side of the seat in a plan view, and fixes the bracket disposed on the inside; ,
Bracket fixing structure of seat back frame with