JPWO2017022724A1 - Seat back frame - Google Patents

Abstract

Reduce the weight of the upper frame while suppressing the decrease in rigidity. The seat back frame (10) has an upper frame (11) having an extension portion (11a) extending downward at both ends in the seat width direction, and an upper end portion (12a) extending upward. To support the pressure receiving member (14), the pressure receiving member (14) receiving a load from the back of the seated person between the side frame (12) joined to the protruding portion (11a), the side frame (12). A connecting frame (15) extending along the seat width direction and connecting the extending portions (11a) to each other, and the upper end (12a) of the side frame (12) is the lower end of the connecting frame (15). The extension part (11a) extends to a position beyond the lower end of the connecting frame (15).

Description

  The present invention relates to a seat back frame, and more particularly to a seat back frame capable of reducing the weight of an upper frame while suppressing a decrease in rigidity.

  Conventionally, the weight of the seat back frame that forms the skeleton of the seat back has been reduced. In particular, the weight of the upper frame constituting the upper portion of the seat back frame has been reduced. For example, when the upper frame is made of a pipe material, the upper frame is reduced in weight by thinning the pipe material.

  On the other hand, extending portions that extend downward are provided at both ends of the upper frame in the seat width direction, and a connecting frame that connects the extending portions is provided between the extending portions. ing. The connection frame may support a pressure receiving member that receives a load applied from the back of the seated person between the side frames in the seat back frame (see Patent Document 1).

JP 2013-256163 A

  And in the structure which supports a pressure receiving member with a connection frame like patent document 1, it is necessary to ensure the rigidity of the part to which a connection frame is attached among the extension parts of an upper frame. Therefore, when reducing the weight of the upper frame, it is necessary to reduce the weight after ensuring the rigidity of the attachment portion of the connecting frame in the extended portion.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a seat back frame capable of reducing the weight of the upper frame while suppressing a decrease in rigidity.

  According to the seat back frame of the present invention, the seat back frame forms a skeleton of the seat back, and forms an upper portion of the seat back frame and extends downward at both ends in the seat width direction. An upper frame having an extending portion, a side frame that forms both side portions of the seat back frame, and an upper end portion that extends upward is joined to the extending portion; and in the seat width direction A pressure receiving member that is provided between the side frames and receives a load from the back of the seated person, and a connecting frame that extends along the seat width direction to support the pressure receiving member and connects the extending parts to each other. And the upper end portion extends to a position above the lower end of the connection frame, and the extension portion extends to a position below the lower end of the connection frame. It is solved by Rukoto.

  In the seat back frame configured as described above, the upper end portion of the side frame extends to a position above the lower end of the connection frame, and the extension portion of the upper frame extends below the lower end of the connection frame. It extends to the position. With such a configuration, it is possible to ensure the rigidity of the extending portion, particularly the rigidity of the attachment portion of the connecting frame in the extending portion. As a result, it is possible to reduce the weight of the upper frame while ensuring the rigidity of the upper frame where rigidity is required (specifically, the connecting frame mounting portion).

In the above seat back frame, the upper end portion is joined to the outer peripheral surface of the extension portion, and is fastened to the outer peripheral surface of the extension portion at both ends in the extension direction of the connection frame. A fastening portion is formed, and a position where the upper end portion is joined to the outer peripheral surface and a position where the fastening portion is joined to the outer peripheral surface are different from each other in the circumferential direction of the outer peripheral surface. It is good to be.
In said structure, the joining position of the upper end part of a side frame and the joining position of the fastening part of a connection frame differ mutually in the circumferential direction of the outer peripheral surface of the extension part with which an upper frame is equipped. Thereby, each joining operation | work can be performed more smoothly compared with the case where the joining position of the upper end part of a side part frame and the joining position of the fastening part of a connection frame have overlapped.

In the seat back frame, a bent portion is formed in the extending portion, and the upper end extends along the outer peripheral surface of the extending portion to a position over the bent portion. It is good to be.
In the above configuration, the bending portion is formed in the extending portion of the upper frame, so that the rigidity of the extending portion is improved. Further, since the upper end portion of the side frame extends to the position above the bent portion along the outer peripheral surface of the extending portion, the rigidity of the extending portion can be further improved.

In the above seat back frame, the upper end portion may be joined to a straight portion in the extension portion.
In the above configuration, since the portion where the upper end of the side frame is joined is a straight portion in the extended portion of the upper frame, for example, the upper end is compared with the case where the portion is a curved portion. It becomes possible to perform the joining operation | work of a part more smoothly.

According to the present invention, it is possible to reduce the weight of the upper frame while securing the rigidity of a portion where the rigidity is required in the upper frame (specifically, the attachment portion of the connecting frame).
Moreover, according to this invention, it becomes possible to perform the operation | work which joins the upper end part of a side frame and the fastening part of a connection frame more smoothly to the extension part of an upper frame.
Further, according to the present invention, it is possible to further improve the rigidity of the extending portion of the upper frame.
Moreover, according to this invention, it becomes possible to perform more smoothly the operation | work which joins the upper end part of a side part frame to the extension part of an upper frame.

It is a figure which shows the whole image of the seat frame containing the seat back frame which concerns on one Embodiment of this invention. It is an enlarged view of the attachment part periphery of a connection frame in the extension part of an upper frame. It is sectional drawing of the attachment part of a connection frame in the extension part of an upper frame.

  Hereinafter, a configuration of a seat back frame according to an embodiment (this embodiment) of the present invention will be described with reference to FIGS. The embodiment described below is an example for facilitating understanding of the present invention, and does not limit the present invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents.

  Hereinafter, the seat back frame 10 used in a vehicle seat will be described as an example of the seat back frame according to the present embodiment. Incidentally, in the following description, the “seat width direction” is the lateral width direction of the vehicle seat, and corresponds to the left-right direction when viewed from the seated person. The “vertical direction” is the vertical direction when the vehicle seat is mounted in the vehicle, in other words, the seat height direction.

  As described above, the seat back frame 10 according to the present embodiment is a component part of a vehicle seat and forms a skeleton of the seat back. That is, as shown in FIG. 1, the seat back frame 10 according to the present embodiment is assembled to the rear end portion of the seat cushion frame 20 to constitute the seat frame 1 of the vehicle seat. Note that the vehicle seat may be movable in the front-rear direction (vehicle traveling direction) by a slide rail mechanism 30 installed at the lower part of the seat, and the seat cushion frame 20 and the slide rail mechanism 30 It may be movable up and down by a height adjusting mechanism 40 installed therebetween.

  The basic configuration of the seat back frame 10 according to the present embodiment will be described. Most of the configuration is common to the configuration of a general seat back frame. More specifically, as shown in FIG. 1, the seat back frame 10 includes an upper frame 11, a pair of left and right side frames 12, a lower frame 13, a pressure receiving member 14, and a connecting frame 15. .

  The upper frame 11 forms the upper part of the seat back frame 10 and is configured by bending a metal round pipe into an inverted U shape. The uppermost portion (horizontal portion) of the upper frame 11 extends straight along the seat width direction, and a pair of pillar guides 11x into which a pillar material included in a headrest (not shown) is inserted is welded to the front surface. ing.

  Further, the upper frame 11 includes extended portions 11a extending downward at both ends in the seat width direction. The extending portion 11a is bent once at an intermediate position in the extending direction to form a bent portion 11c illustrated in FIG. Further, in the extending portion 11a, the portion from the upper end of the extending portion 11a to the formation position of the bent portion 11c is inclined so as to go outward in the sheet width direction as it goes downward. A portion located below the bent portion 11c extends straight downward along the vertical direction (the seat height direction). In addition, in the extension part 11a, the part located above the bending part 11c and the part located below the bending part 11c both extend linearly and form a straight part 11b.

  The side frame 12 is a portion that forms both side portions of the seat back frame 10, and is configured by molding a metal plate-like member into a predetermined shape. The configuration of the side frame 12 will be described. The side frame 12 has a spindle shape when viewed from the side, and the upper end portion 12a extends upward. And the upper end part 12a is joined to the said extension part 11a in the state superimposed on the extension part 11a of the upper frame 11 from the sheet width direction outer side. More specifically, the upper end portion 12a is curved in an arc shape so as to fit the outer peripheral surface of the extending portion 11a, and is joined to the outer peripheral surface in a state of being superimposed on the outer peripheral surface of the extending portion 11a. Yes.

  In addition, in the extension part 11a, the range where the upper end part 12a of the side frame 12 is joined is a position slightly above the bent part 11c in the extension part 11a and beyond the bent part 11c. It extends to. That is, the upper end portion 12a of the side frame 12 is joined to the extending portion 11a in a state of straddling the bent portion 11c. Incidentally, as shown in FIG. 2, the portion of the upper end portion 12a of the side frame 12 that faces the bent portion 11c is bent at the same bending angle as that of the bent portion 11c.

  The lower frame 13 is a so-called lower member frame, and extends along the seat width direction in order to connect the lower ends of the pair of left and right side frames 12. The pressure receiving member 14 is a member that is provided between the side frames 12 in the seat width direction and receives a load applied from the back of the seated person. As shown in FIG. 1, the pressure receiving member 14 according to the present embodiment includes support wires extending in the vertical direction spaced apart in the sheet width direction, and elastic wires extending in the sheet width direction between the support wires. It is configured by erection. However, it is not limited to this, The pressure receiving member 14 may be comprised with the plate-shaped member.

  The connecting frame 15 extends along the seat width direction in order to support the pressure receiving member 14, and connects the extending portions 11 a of the upper frame 11. The connection frame 15 is formed of a metal plate plate in a predetermined shape. The structure of the connection frame 15 will be described. The connection frame 15 includes a fastening portion 15a formed at both ends in the extending direction, and a long portion 15b sandwiched between the fastening portions 15a. . The fastening part 15a is a part fastened to the outer peripheral surface of the extending part 11a. Further, as shown in FIGS. 2 and 3, the fastening portion 15a is curved in an arc shape so as to be fitted to the outer peripheral surface of the extending portion 11a, and the fastening portion 15a is overlapped with the outer peripheral surface of the extending portion 11a. It is joined to the outer peripheral surface. The long portion 15b extends long along the sheet width direction, and a support frame constituting the pressure receiving member 14 is fixed to the front surface thereof. Thereby, the connection frame 15 supports the pressure receiving member 14 in a suspended state.

  Note that the lower end portion of the long portion 15b is bent forward to form a flange portion. In the vertical direction, the lower end position of the long portion 15b (strictly speaking, the lower end position of the flange portion) is located below the lower end position of the fastening portion 15a.

  Next, a characteristic configuration of the seat back frame 10 according to the present embodiment will be described. In the seat back frame 10 according to the present embodiment, the metal pipe constituting the upper frame 11 is thinner than the metal pipe constituting the normal seat back frame, and the weight is reduced accordingly. Further, the length of the extending portion 11a is also shorter than the length of a normal seat back frame, thereby further reducing the weight.

  On the other hand, since the load input to the pressure receiving member 14 is transmitted to the portion to which the connecting frame 15 is attached (that is, the portion to which the fastening portion 15a is joined) in the extending portion 11a of the upper frame 11, It is necessary to ensure sufficient rigidity to withstand the load. Therefore, in the seat back frame 10 according to the present embodiment, as shown in FIG. 2, the upper end portion 12a of the side frame 12 is located above the lower end of the connecting frame 15 (strictly speaking, the lower end position of the long portion 15b). It extends to the position beyond. Further, the extending portion 11a of the upper frame 11 extends to a position beyond the lower end of the connecting frame 15 (strictly speaking, the lower end position of the long portion 15b).

  If it is the above structures, the part to which the connection frame 15 is attached among the extension parts 11a of the upper frame 11 will be reinforced by the upper end part 12a of the side frame 12, and the fastening part 15a of the connection frame 15. become. As a result, the rigidity of the attachment part of the connection frame 15 is ensured in the extension part 11a.

  In the present embodiment, as shown in FIG. 2, the uppermost portion of the upper end portion 12 a of the side frame 12 (that is, the front end portion 12 b) is slightly below the fastening portion 15 a of the connecting frame 15. Located in position. However, it is not limited to this, The front-end | tip part 12b may have reached the same position as the fastening part 15a, or the upper position rather than the fastening part 15a.

  Further, a bent portion 11c is provided at a midway position of the extending portion 11a, specifically, in the vicinity of a location where the fastening portion 15a of the connecting frame 15 is joined (strictly, a location slightly lowered from the location). Is formed. Thereby, the rigidity of the attachment part of the connection frame 15 is further improved in the extension part 11a. Moreover, the upper end part 12a of the side part frame 12 is joined to the outer peripheral surface of the extension part 11a so that the bending part 11c may be straddled. In other words, the upper end portion 12a of the side frame 12 extends along the outer peripheral surface of the extending portion 11a to a position beyond the bent portion 11c. Thereby, the rigidity of the attachment part of the connection frame 15 is further improved in the extension part 11a.

  Incidentally, in this embodiment, as shown in FIG. 3, in the circumferential direction of the outer peripheral surface of the extending portion 11a, the position where the upper end portion 12a of the side frame 12 is joined to the outer peripheral surface, and the connecting frame 15 The positions at which the fastening portions 15a are joined to the outer peripheral surface are different from each other. With such a positional relationship, the upper end portion 12a of the side frame 12 and the fastening portion 15a of the connecting frame 15 do not interfere with each other. For this reason, when joining the upper end part 12a of the side part frame 12 and the fastening part 15a of the connection frame 15 to an outer peripheral surface, it is possible to perform the joining operation | work smoothly.

  In the present embodiment, the upper end portion 12a of the side frame 12 includes a straight portion 11b positioned below the bent portion 11c and a straight portion 11b positioned above the bent portion 11c in the extended portion 11a. It is joined to both sides. Since the upper end portion 12a of the side frame 12 is joined to the straight portion 11b of the extension portion 11a in this way, the operation of joining the upper end portion 12a of the side frame 12 to the outer peripheral surface of the extension portion 11a is smoother. Can be done.

DESCRIPTION OF SYMBOLS 1 Seat frame 10 Seat back frame 11 Upper frame 11a Extension part 11b Straight line part 11c Bending part 11x Pillar guide 12 Side part frame 12a Upper end part 12b Tip part 13 Lower frame 14 Pressure receiving member 15 Connection frame 15a Fastening part 15b Long part 20 Seat cushion frame 30 Slide rail mechanism 40 Height adjustment mechanism

Claims (4)

A seat back frame that forms a skeleton of the seat back,
Forming an upper part of the seat back frame, and an upper frame provided with extending portions extending downward at both ends in the seat width direction;
A side frame that forms both side portions of the seat back frame, and an upper end portion that extends upward is joined to the extension portion;
A pressure receiving member provided between the side frames in the seat width direction and receiving a load from the back of the seated person;
Extending in the sheet width direction to support the pressure receiving member, and having a connecting frame for connecting the extending portions,
The seat back frame, wherein the upper end portion extends to a position above the lower end of the connection frame and the extension portion extends to a position below the lower end of the connection frame. . The upper end part is joined to the outer peripheral surface of the extension part,
Fastening portions that are fastened to the outer peripheral surface of the extension portion are formed at both ends in the extension direction of the connection frame,
The position where the upper end portion is joined to the outer peripheral surface and the position where the fastening portion is joined to the outer peripheral surface are different from each other in the circumferential direction of the outer peripheral surface. The seat back frame according to 1. The extension portion is formed with a bent portion,
2. The seat back frame according to claim 1, wherein the upper end portion extends along the outer peripheral surface of the extension portion to a position over the bending portion.   The seat back frame according to claim 1, wherein the upper end part is joined to a straight line part in the extension part.

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