Vehicle seat

Abstract

To obtain a vehicle seat which can secure strength and rigidity of a seat frame when a load is input in a seat width direction.SOLUTION: A vehicle seat 10 includes a cushion frame 16 having: a pair of left and right risers 20, 22 which are spaced from each other in a seat width direction; and a connection pipe 24 connecting the pair of left and right risers 20, 22 in the seat width direction. Further, the vehicle seat 10 includes: attachment parts 26, 28 which are fixed to the connection pipe 24 and to which a child seat 15 is attached; and reinforcement members 30, 32. The reinforcement member 30, 32 are fixed to the risers 20, 22 and the connection pipe 24, spanning the risers 20, 22 and the attachment parts. Further, the reinforcement members 30, 32 limit displacement of the connection pipe 24 relative to the pair of left and right risers 20, 22 in the seat width direction when a load acting in the seat width direction is input from the attachment parts 26, 28 to the connection pipe 24.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] Patent Document 1 below discloses a vehicle seat having a pair of left and right mounting portions (fixing portions) to which a child seat (children's seat) is attached. The vehicle seat described in this document includes a seat frame that forms the framework of the seat cushion. The seat frame includes a pair of left and right metal members arranged at an interval in the seat width direction, and a rear rod-shaped member that connects the rear ends of the pair of left and right metal members in the seat width direction. The pair of left and right mounting portions to which the child seat is attached are fixed to the rear rod-shaped member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-142727 Summary of the Invention [Problem to be solved by the invention]

[0004] In a vehicle seat having a mounting portion for a child car seat, loads caused by vehicle travel or a collision are input from the child car seat to the seat frame via the mounting portion. In particular, when the vehicle is cornering or in a side collision, loads in the width direction of the seat are input from the child car seat to the seat frame via the mounting portion. Therefore, it is desirable to ensure the strength and rigidity of the seat frame when a load is input in the width direction of the seat. However, the configuration described in Patent Document 1 leaves room for improvement in this regard.

[0005] In consideration of the above, an object of the present invention is to provide a vehicle seat that can ensure the strength and rigidity of the seat frame when a load is input in the seat width direction. [Means for solving the problem]

[0006] The vehicle seat of the first embodiment comprises a seat frame having a pair of left and right cross members spaced apart in the seat width direction and a connecting member connecting the pair of left and right cross members in the seat width direction, an attachment portion fixed to the connecting member and to which a child seat is attached, and a reinforcing member fixed to the cross member and the connecting member while spanning between the cross member and the attachment portion.

[0007] In the vehicle seat of the first aspect, a child seat is attached to the mounting portion. When a load in the seat width direction is input from the child seat to the mounting portion, the load is transmitted from the connecting member, which constitutes a part of the seat frame, to a pair of left and right lateral members, which constitute another part of the seat frame. At this time, a load that tends to displace the connecting member in the seat width direction relative to the pair of left and right lateral members is input to the seat frame. In the vehicle seat of the first aspect, reinforcing members are fixed to the lateral members and the connecting member while spanning between the lateral members and the mounting portion. The presence of these reinforcing members limits displacement of the connecting member in the seat width direction relative to the pair of left and right lateral members when a load in the seat width direction is input from the mounting portion to the connecting member. In this way, the vehicle seat of the first aspect ensures the strength and rigidity of the seat frame when a load in the seat width direction is input.

[0008] A vehicle seat according to a second aspect is the vehicle seat according to the first aspect, wherein the lateral member, the connecting member, and the reinforcing member form a closed cross section.

[0009] In the vehicle seat of the second aspect, a closed cross section is formed between the horizontal member, the connecting member, and the reinforcing member in a cross section cut along the seat vertical direction and the seat width direction. This configuration improves the strength and rigidity of the seat frame compared to a configuration in which a closed cross section is not formed between the horizontal member, the connecting member, and the reinforcing member.

[0010] A vehicle seat of a third aspect is a vehicle seat according to the first or second aspect, wherein the mounting portion is joined to the connecting member at a first location and a second location on the seat width direction outer side of the first location, and the end of the reinforcing member on the connecting member side is joined to the connecting member at a position along the second location.

[0011] In a vehicle seat according to a third aspect, the mounting portion is joined to the connecting member at a first location and a second location on the seat width direction outer side of the first location. Furthermore, the end of the reinforcing member facing the connecting member is joined to the connecting member at a position along the second location. With this configuration, a load in the seat width direction input to the mounting portion can be more quickly transmitted to the reinforcing member than with a configuration in which the end of the reinforcing member facing the connecting member is joined to the connecting member at a position away from the second location.

[0012] A fourth aspect of the vehicle seat is a vehicle seat according to the first or second aspect, wherein the mounting portion is joined to the connecting member at a first location and a second location spaced apart from the first location in the seat width direction, and the end of the reinforcing member on the connecting member side is joined between the first location and the second location in the seat width direction.

[0013] In the vehicle seat of the fourth aspect, the end of the reinforcing member on the connecting member side is joined between the first and second locations in the seat width direction. With this configuration, a load in the seat width direction input to the mounting portion can be quickly transmitted to the reinforcing member via the first and second locations. [Effects of the Invention]

[0014] The vehicle seat according to the present invention has the excellent effect of ensuring the strength and rigidity of the seat frame when a load is input in the seat width direction. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view schematically showing a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 2 is a front view of the components constituting the rear part of the cushion frame, as viewed from the front side. [Figure 3] 3A and 3B are cross-sectional views schematically showing cross sections of the members constituting the rear portion of the cushion frame taken along the seat vertical direction and the seat width direction. DETAILED DESCRIPTION OF THE INVENTION

[0016] A vehicle seat 10 according to an embodiment of the present invention will be described with reference to Figures 1 to 3. In the drawings, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, the arrow LH indicates the left side in the seat width direction, and the arrow RH indicates the right side in the seat width direction. Furthermore, in the following description, unless otherwise specified, when referring to front-rear, up-down, and left-right directions, these refer to front-rear in the seat front-rear direction, up-down in the seat up-down direction, and left-right in the seat width direction.

[0017] 1, the vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant from below, and a seat back 14 that supports the back of the seated occupant from the rear. A child seat 15 can be attached and fixed to the vehicle seat 10 of this embodiment.

[0018] 1 and 2, the seat cushion 12 includes a cushion frame 16 that forms the framework of the seat cushion 12, and a cushion pad 18 attached to the cushion frame 16. The cushion frame 16 is an example of a seat frame. The cushion pad 18 is covered with a trim on the side facing the seated occupant.

[0019] 2 and 3, the rear portion of the cushion frame 16 is configured to include a pair of left and right risers 20, 22 that are spaced apart in the seat width direction and extend in the front-to-rear direction, and a connecting pipe 24 that connects the pair of left and right risers 20, 22 in the seat width direction. The risers 20, 22 are an example of a cross member, and the connecting pipe 24 is an example of a connecting member.

[0020] The left riser 20 is formed, for example, by pressing a steel plate. The riser 20 includes a left plate portion 20A extending vertically with its thickness aligned with the seat width direction. An insertion hole 20B is formed in an upper portion of the left plate portion 20A, into which the left end of the connecting pipe 24 is inserted. The riser 20 also includes a lower flange portion 20C extending from the lower end of the left plate portion 20A toward the inside (right side) in the seat width direction, a front flange portion 20D extending from the front end of the left plate portion 20A toward the inside (right side) in the seat width direction, and a rear flange portion 20E extending from the rear end of the left plate portion 20A toward the inside (right side) in the seat width direction. The lower flange portion 20C is fixed to the vehicle floor via a seat slide rail (not shown) or the like.

[0021] The right riser 22 is formed, for example, by pressing a steel sheet material, similar to the left riser 20. The riser 22 includes a right plate portion 22A that extends vertically with its thickness direction coincident with the seat width direction. An insertion hole 22B into which the right end of the connecting pipe 24 is inserted is formed in an upper portion of the right plate portion 22A. The riser 22 also includes a lower flange portion 22C that extends from the lower end of the right plate portion 22A toward the inside (left side) in the seat width direction, and an upper flange portion 22D that extends from the upper end of the right plate portion 22A toward the inside (left side) in the seat width direction. The lower flange portion 22C is fixed to the vehicle floor via a seat slide rail or the like (not shown). The riser 22 also has a front flange portion 22E extending from the front end of the right side plate portion 22A toward the inside (left side) in the seat width direction, and a rear flange portion 22F extending from the rear end of the right side plate portion 22A toward the inside (left side) in the seat width direction.

[0022] The connecting pipe 24 is formed, for example, using a round steel pipe with its axial direction aligned with the seat width direction. The left end of the connecting pipe 24 is inserted into an insertion hole 20B formed in the left plate portion 20A of the left riser 20 and supported by the left plate portion 20A. The right end of the connecting pipe 24 is inserted into an insertion hole 22B formed in the right plate portion 22A of the right riser 22 and supported by the right plate portion 22A.

[0023] A pair of left and right mounting portions 26, 28 are fixed to the connecting pipe 24. The left mounting portion 26, for example, is formed by bending a round steel bar. Specifically, the left mounting portion 26 includes a mounting portion main body 26A extending in the seat width direction, an inner support portion 26B extending from the inner (right) end of the mounting portion main body 26A in the seat width direction toward the connecting pipe 24, and an outer support portion 26C extending from the outer (left) end of the mounting portion main body 26A in the seat width direction toward the connecting pipe 24. The end of the inner support portion 26B opposite the mounting portion main body 26A is fixed to a left portion of the connecting pipe 24 by welding or the like. The end of the outer support portion 26C opposite the mounting portion main body 26A is fixed to a left portion of the connecting pipe 24 by welding or the like.

[0024] The right-side mounting portion 28 has a configuration similar to that of the left-side mounting portion 26. More specifically, the right-side mounting portion 28 includes a mounting portion main body 28A, an inner support portion 28B, and an outer support portion 28C that respectively correspond to the mounting portion main body 26A, the inner support portion 26B, and the outer support portion 26C of the left-side mounting portion 26. The end of the inner support portion 28B opposite to the mounting portion main body 28A is fixed to a portion on the right side of the connecting pipe 24 by welding or the like. The end of the outer support portion 28C opposite to the mounting portion main body 28A is fixed to a portion on the right side of the connecting pipe 24 by welding or the like.

[0025] A reinforcing member 30 is fixed to the left side of the left riser 20 and the connecting pipe 24. The reinforcing member 30 is formed, for example, by pressing a steel plate. Specifically, the reinforcing member 30 includes a left reinforcing plate 30A extending vertically with the seat width direction as its thickness direction; a lower reinforcing plate 30B extending from the lower end of the left reinforcing plate 30A toward the outside (left side) in the seat width direction; a front reinforcing plate 30C extending from the front end of the left reinforcing plate 30A toward the outside (left side) in the seat width direction; and a rear reinforcing plate 30D extending from the rear end of the left reinforcing plate 30A toward the outside (left side) in the seat width direction. As shown in FIG. 3 , the lower reinforcing plate 30B and the lower flange 20C of the left riser 20 are joined by welding or the like in a vertically overlapping state. The upper end of the left reinforcing plate 30A is fixed to the left side of the connecting pipe 24 by welding or the like. As a result, a rectangular closed cross section is formed between the left riser 20, the connecting pipe 24, and the left reinforcing member 30. In this embodiment, the upper end of the left reinforcing plate 30A is fixed to a left portion of the connecting pipe 24, while being disposed along the portion of the connecting pipe 24 where the outer support column 26C of the left mounting portion 26 is fixed. In addition, the upper end of the left reinforcing plate 30A is located on the inner side (right side) in the seat width direction relative to the outer support column 26C of the left mounting portion 26. As a result, the reinforcing member 30 is suspended between the left riser 20 and the left mounting portion 26.

[0026] As shown in FIGS. 2 and 3 , a reinforcing member 32 is fixed to the right side of the right riser 22 and the connecting pipe 24. This reinforcing member 32 is formed, for example, by pressing a steel sheet, similar to the left reinforcing member 30. Specifically, the reinforcing member 32 includes a right reinforcing plate portion 32A extending vertically with the seat width direction as its thickness direction; a lower reinforcing plate portion 32B extending from the lower end of the right reinforcing plate portion 32A toward the outside (right side) in the seat width direction; a front reinforcing plate portion 32C extending from the front end of the right reinforcing plate portion 32A toward the outside (right side) in the seat width direction; and a rear reinforcing plate portion 32D extending from the rear end of the right reinforcing plate portion 32A toward the outside (right side) in the seat width direction. As shown in FIG. 3 , the lower reinforcing plate portion 32B and the lower flange portion 22C of the right riser 22 are joined by welding or the like in a vertically overlapping state. The upper end of the right reinforcing plate 32A is fixed to a right portion of the connecting pipe 24 by welding or the like. As a result, a rectangular closed cross section is formed between the right riser 22, the connecting pipe 24, and the right reinforcing member 32. In this embodiment, the upper end of the right reinforcing plate 32A is fixed to a right portion of the connecting pipe 24 while being disposed along a portion of the connecting pipe 24 to which the outer support column 28C of the right mounting portion 28 is fixed. The upper end of the right reinforcing plate 32A is located on the inner side (left side) of the outer support column 28C of the right mounting portion 28 in the seat width direction. As a result, the reinforcing member 32 is suspended between the right riser 22 and the right mounting portion 28.

[0027] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0028] 1 to 3, in the vehicle seat 10 of the present embodiment described above, a connector portion (not shown) provided on the child seat 15 is engaged with the mounting portion main body 26A of the left mounting portion 26 and the mounting portion main body 28A of the right mounting portion 28. This allows the child seat 15 to be attached and fixed to the vehicle seat 10.

[0029] When a load in the seat width direction is input from the child seat 15 to the pair of left and right mounting portions 26, 28, the load is transmitted from the connecting pipe 24 constituting a part of the cushion frame 16 to the pair of left and right risers 20, 22 constituting another part of the cushion frame 16. At this time, a load that tends to displace the connecting pipe 24 in the seat width direction relative to the pair of left and right risers 20, 22 is input to the cushion frame 16. In the vehicle seat 10 of this embodiment, the reinforcing member 30 is secured to the left riser 20 and the connecting pipe 24 while spanning between the left riser 20 and the left mounting portion 26. In addition, the reinforcing member 32 is secured to the right riser 22 and the connecting pipe 24 while spanning between the right riser 22 and the right mounting portion 28. The provision of these reinforcing members 30, 32 makes it possible to limit displacement of the connecting pipe 24 in the seat width direction relative to the pair of left and right risers 20, 22 when a load in the seat width direction is input to the connecting pipe 24 from the pair of left and right mounting portions 26, 28. In this way, the vehicle seat 10 of this embodiment can ensure the strength and rigidity of the cushion frame 16 when a load in the seat width direction is input.

[0030] In this embodiment, a rectangular closed cross section is formed between the left riser 20, the connecting pipe 24, and the left reinforcing member 30, and a rectangular closed cross section is formed between the right riser 22, the connecting pipe 24, and the right reinforcing member 32. This configuration can improve the strength and rigidity of the cushion frame 16 compared to the above-mentioned configuration in which no closed cross section is formed.

[0031] Furthermore, in this embodiment, the upper end portion of the left reinforcing plate portion 30A of the left reinforcing member 30 is fixed to a left portion of the connecting pipe 24 while being disposed along the portion of the connecting pipe 24 where the outer support column 26C of the left mounting portion 26 is fixed. With this configuration, a load in the seat width direction input to the mounting portion 26 can be quickly transmitted to the left reinforcing plate portion 30A of the reinforcing member 30. In addition, with the configuration in which the upper end portion of the left reinforcing plate portion 30A of the left reinforcing member 30 is disposed on the connecting pipe 24 between the inner support column 26B and the outer support column 26C of the left mounting portion 26 and is disposed to the left of the center position of the left mounting portion 26 in the lateral direction, it is possible to easily access the vicinity of the upper end portion of the left reinforcing plate portion 30A from the right side with a welding torch 34 when fixing the left reinforcing member 30 to the connecting pipe 24.

[0032] Furthermore, in this embodiment, the upper end portion of the right reinforcing plate portion 32A of the right reinforcing member 32 is fixed to the right side of the connecting pipe 24 while being disposed along the portion of the connecting pipe 24 where the outer support column 28C of the right mounting portion 28 is fixed. With this configuration, a load in the seat width direction input to the mounting portion 28 can be quickly transmitted to the right reinforcing plate portion 32A of the reinforcing member 32. In addition, with this configuration, the upper end portion of the right reinforcing plate portion 32A of the right reinforcing member 32 is disposed on the connecting pipe 24 between the inner support column 28B and the outer support column 28C of the right mounting portion 28 and is disposed to the right of the center position of the right mounting portion 28 in the left-right direction. This configuration makes it easier for the welding torch 34 to access the vicinity of the upper end portion of the right reinforcing plate portion 32A from the left side when fixing the right reinforcing member 32 to the connecting pipe 24.

[0033] In this embodiment, the left reinforcing member 30 includes a front reinforcing plate 30C connected to the left reinforcing plate 30A and the lower reinforcing plate 30B, and the front reinforcing plate 30C is joined to the left riser 20. This increases the rigidity of the reinforcing member 30 and the left riser 20. Furthermore, by forming the left reinforcing plate 30A to extend in the front-to-rear direction as it extends downward along the left riser 20, the load can be more effectively distributed downward. To further increase the rigidity of the inner support portion 26B of the left mounting portion 26, the left reinforcing plate 30A can be joined to the inner support portion 26B. The upper end of the left reinforcing plate 30A may be joined to either the inner support portion 26B or the outer support portion 26C of the mounting portion 26 to increase the rigidity around the mounting portion 26. Similarly, a configuration can be adopted in which the right reinforcing plate 32A is joined to the inner support portion 28B to further increase the rigidity of the inner support portion 28B of the right mounting portion 28. Also, the rigidity around the mounting portion 28 can be increased by joining the upper end portion of the right reinforcing plate 32A to either the inner support portion 28B or the outer support portion 28C of the mounting portion 28.

[0034] Although the present embodiment has been described with reference to an example in which the reinforcing members 30, 32 are joined to the above-mentioned locations on the connecting pipe 24, the present invention is not limited to this. The joining positions of the reinforcing members 30, 32 to the connecting pipe 24 may be appropriately determined taking into consideration the assembly process of the cushion frame 16 and the strength and rigidity required of the cushion frame 16. For example, a configuration may be employed in which the upper end of the left reinforcing plate portion 30A of the left reinforcing member 30 is disposed to the left of the outer support portion 26C of the left mounting portion 26 on the connecting pipe 24. Alternatively, a configuration may be employed in which the upper end of the right reinforcing plate portion 32A of the right reinforcing member 32 is disposed to the right of the outer support portion 28C of the right mounting portion 28 on the connecting pipe 24.

[0035] In addition, in this embodiment, an example has been described in which the reinforcing members 30, 32 are configured to form a closed cross section as described above, but the present invention is not limited to this. The configuration of the reinforcing members 30, 32 may be appropriately set in consideration of the strength, rigidity, etc. required for the cushion frame 16.

[0036] In addition, in the present embodiment, an example has been described in which the front reinforcing plate portion 30C is connected to the lower reinforcing plate portion 30, but the present invention is not limited to this. For example, a configuration in which the front reinforcing plate portion 30C is not connected to the lower reinforcing plate portion 30 may also be employed.

[0037] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0038] 10 Vehicle seats 16 Cushion frame (seat frame) 20 Riser (horizontal member) 22 Riser (horizontal member) 24 Connecting pipe (connecting member) 26 Mounting part 28 Mounting part 30 Reinforcement member 32 Reinforcement member

Claims

1. a seat frame including a pair of left and right lateral members arranged at an interval in the seat width direction, and a connecting member connecting the pair of left and right lateral members in the seat width direction; a mounting portion fixed to the connecting member and to which a child seat is attached; a reinforcing member that is fixed to the horizontal member and the connecting member in a state of being suspended between the horizontal member and the mounting portion; A vehicle seat comprising:

2. The vehicle seat according to claim 1, wherein the cross member, the connecting member, and the reinforcing member form a closed cross section.

3. The attachment portion is joined to the connecting member at a first location and a second location that is outboard of the first location in the seat width direction, 3. The vehicle seat according to claim 1, wherein an end of the reinforcing member on the connecting member side is joined to the connecting member at a position along the second location.

4. the attachment portion is joined to the connecting member at a first location and a second location spaced apart from the first location in the seat width direction, 3. The vehicle seat according to claim 1, wherein an end of the reinforcing member on the connecting member side is joined between the first location and the second location in the seat width direction.

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