Vehicle seat

Abstract

To provide a vehicle seat that can suppress discomfort receiving from a pelvis support even in the state that a back rest is reclined.SOLUTION: If a back rest 14 is reclined, a pelvis support 66 is retreated to a rear side in a seat longitudinal direction against energization force of a coil spring 64 by a load of a crewman P. By this, in the state that the back rest 14 is reclined, possibility such that the pelvis support 66 strongly contacts the crewman P is reduced, and discomfort receiving from the pelvis support 66 can be suppressed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] The following Patent Document 1 discloses a technology relating to a vehicle seat in which a pressure support member provided in the seat back presses and supports the occupant's lower back. In this prior art, when the seat back is tilted (reclined) toward the rear of the seat with respect to the seat cushion, a linking mechanism moves the pressure support member toward the front of the seat back relative to the seat back. This prevents the occupant's lower back from separating from the pressure support member, preventing discomfort for the occupant leaning against the seat back. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-173170 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned prior art, when the seat back (hereinafter referred to as "backrest") is reclined, a step is created between the cushion of the backrest and the pressure support member (pelvic support), which may cause pressure on the lower back and cause discomfort.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle seat that can reduce the discomfort felt from the pelvic support even when the backrest is reclined. [Means for solving the problem]

[0006] The vehicle seat according to the first aspect includes a seat cushion that supports the buttocks and thighs of an occupant, a backrest that supports the back of the occupant, and a pelvic support that is provided on the backrest and supports the lumbar region of the occupant by the biasing force of a biasing member provided on the backrest, and that retracts rearward in the fore-and-aft direction of the seat due to the weight of the occupant against the biasing force of the biasing member when the backrest is reclined.

[0007] A vehicle seat according to a first aspect includes a seat cushion, a backrest, and a pelvic support. The seat cushion supports the buttocks and thighs of an occupant, and the backrest supports the back of the occupant. The pelvic support is provided on the backrest and supports the lumbar region of the occupant with the biasing force of a biasing member provided on the backrest. When the backrest is reclined, the pelvic support retracts rearward in the front-to-rear direction of the seat due to the weight of the occupant against the biasing force of the biasing member.

[0008] In this aspect, the urging force of the urging member supports the lumbar region of the occupant via the pelvic support, so that when the backrest is in an upright position, the urging force of the urging member acts toward the front of the seat. Here, when the backrest is in an upright position, the weight of the occupant acts toward the lower side of the seat and is mainly supported by the seat cushion.

[0009] On the other hand, when the backrest is reclined, the weight of the occupant is distributed and supported by the backrest and the seat cushion, and the pelvic support is retracted rearward in the front-to-rear direction of the seat against the biasing force of the biasing member due to the weight of the occupant.

[0010] The load of the occupant acting on the backrest is greater when the backrest is reclined than when the backrest is upright, and when the backrest is reclined, the backrest sinks in response to the load of the occupant.

[0011] In this aspect, when the backrest is reclined, the pelvic support is retracted rearward in the fore-and-aft direction of the seat against the biasing force of the biasing member due to the weight of the occupant, thereby reducing the possibility of the pelvic support coming into strong contact with the occupant and making it possible to suppress any discomfort felt by the pelvic support.

[0012] A vehicle seat according to a second aspect is a vehicle seat according to the first aspect, wherein the backrest includes a frame-shaped frame that forms the skeleton of the backrest and a support member that is arranged inside the frame and supports the back of the occupant, and the pelvic support is provided at the lower end of the support member and is supported by the support member via the biasing member so as to be swingable about an axis along the seat width direction.

[0013] In a vehicle seat according to a second aspect, the backrest includes a frame and a support member. The backrest has a skeleton formed by the frame, and the support member is disposed inside the frame. The support member supports the back of the occupant. The pelvis support is provided at a lower end of the support member and is supported by the support member via a biasing member so as to be swingable about an axis along the seat width direction.

[0014] In other words, the pelvic support is biased toward the front side of the seat around the axis by the biasing force of the biasing member, and when the weight of the occupant acts on it, it retracts (swings) toward the rear side of the seat around the axis against the biasing force of the biasing member. In this way, in this aspect, the pelvic support is swung using the biasing force of the biasing member, so the configuration is simple and can be implemented at low cost.

[0015] The vehicle seat of the third aspect is a vehicle seat of the first or second aspect, in which the support member is a lumbar mat attached to the frame and supports the occupant's back, and the pelvic support includes a pelvic support main body that supports the occupant's lower back, a pair of brackets respectively provided at the ends of the lower end of the lumbar mat in the seat width direction, and a pair of arms that are swingably provided relative to the pair of brackets around an axis along the seat width direction and support the pelvic support main body.

[0016] In the vehicle seat according to the third aspect, the support member is a lumbar mat attached to the frame and supporting the occupant's back. The pelvic support includes a pelvic support body, a pair of brackets, and a pair of arms. The pelvic support body supports the occupant's lower back.

[0017] The pair of brackets are provided at the ends of the lower end of the lumbar mat in the seat width direction, and each bracket is provided with an arm that can swing around an axis along the seat width direction, and the pelvis support body is supported by the pair of arms.

[0018] With this configuration, in this embodiment, when the backrest is upright, the pelvic support body (pelvic support) swings toward the front of the seat around an axis along the seat width direction via a pair of arms due to the biasing force of the biasing member, and the pelvic support body supports the occupant's lower back.

[0019] On the other hand, when the backrest is reclined and the weight of the occupant acts on the pelvic support body, the pair of arms swing toward the rear of the seat around an axis along the seat width direction via the pelvic support body against the biasing force of the biasing member, and the pelvic support body retracts.

[0020] In this manner, in this embodiment, it is possible to provide a pelvic support at the lower end of the lumbar mat, so there is no need to perform post-processing on the frame to provide the pelvic support, making it possible to provide this at low cost.

[0021] The vehicle seat according to the fourth aspect is a vehicle seat according to any one of the first to third aspects, wherein the pair of arms include a pair of shaft portions on which the biasing members are respectively provided, a pair of support pieces that support the pelvic support body, and a pair of abutment pieces that respectively abut against the pair of brackets when the pelvic support body is biased forward in the fore-and-aft direction of the seat.

[0022] In a vehicle seat according to a fourth aspect, the pair of arms include a pair of shafts, a pair of support pieces, and a pair of abutment pieces. The pair of shafts are each provided with a biasing member. The pair of support pieces support the pelvis support body. The pair of abutment pieces abut against the pair of brackets when the pelvis support body is biased forward in the seat front-rear direction.

[0023] In this embodiment, the biasing force of the biasing member changes depending on the position of the pelvic support body in the fore-and-aft direction of the seat, so the position of the pelvic support body is set with the abutment piece abutting against the bracket, and the support force of the pelvic support body for the occupant's lower back can be maintained. [Effects of the Invention]

[0024] As described above, the vehicle seat according to the present invention can reduce the discomfort felt from the pelvic support even when the backrest is reclined. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 2 is a perspective view showing a lumbar support and a pelvis support, which are essential parts of the vehicle seat according to the present embodiment. [Figure 2]FIG. 2 is an exploded perspective view showing a lumbar support and a pelvis support, which are essential parts of the vehicle seat according to the present embodiment. [Figure 3] 2 is an enlarged cross-sectional view showing a main part of the vehicle seat according to the embodiment in a state where the backrest is in an upright position. FIG. [Figure 4] 2 is an enlarged cross-sectional view showing a main part of the vehicle seat according to the embodiment in a state where the backrest is reclined. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a vehicle seat according to an embodiment of the present invention will be described with reference to the drawings. Note that in each drawing, some reference numerals may be omitted to make the drawings easier to understand. Also, an arrow FR shown as appropriate in each drawing indicates the front side of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow RH indicates the right side in the vehicle width direction. Hereinafter, when the directions of front-rear, up-down, and left-right are simply used in the description, they refer to front-rear in the front-rear direction of the vehicle, up-down in the vehicle up-down direction, and left-right in the vehicle width direction when facing the direction of travel, unless otherwise specified.

[0027] (Vehicle seat configuration) First, the configuration of the vehicle seat according to this embodiment will be described.

[0028] As shown in Figure 3, the vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks and thighs of an occupant P seated in the vehicle seat 10, a backrest 14 that supports the back of the occupant P, and a headrest 16 that supports the head of the occupant P.

[0029] The seat cushion 12 includes a cushion frame 18 that forms the skeleton of the seat cushion 12 and has a substantially rectangular shape in a plan view, a cushion pad 20 that covers the cushion frame 18 and supports the buttocks and thighs of the occupant P, a support member such as an S-spring 22 that is attached to the cushion frame 18 and positioned below the cushion pad 20 to support the cushion pad 20, and a cushion skin 24 that covers the cushion pad 20 and forms a design surface.

[0030] On the other hand, the backrest 14 is composed of a back frame (frame) 26 that forms the skeleton of the backrest 14 and has an approximately rectangular shape when viewed from the front, a back pad 28 that covers the back frame 26 and supports the back of the occupant P, a lumbar mat (support member) 30 that is attached to the back frame 26 and is located on the seat rear side of the back pad 28 and supports the lumbar region of the occupant P, and a back skin 32 that covers the back pad 28 and forms a design surface.

[0031] The back frame 26 is composed of a pair of left and right back side frames 34 that form both sides in the seat width direction and extend in the vertical direction of the seat, an upper frame 36 that connects the upper ends of the back side frames 34, and a lower frame 38 that connects the lower ends of the back side frames 34.

[0032] In this embodiment, the upper frame 36 and the lower frame 38 are formed from metal pipes, but it goes without saying that they may also be formed from metal plates or the like.

[0033] The lower ends of the pair of left and right back side frames 34 are connected via hinge portions 42 to the rear ends of a pair of left and right cushion side frames 40 that form both sides of the cushion frame 18 in the seat width direction and extend in the front-to-rear direction of the seat.

[0034] The hinge portion 42 is provided along the seat width direction, and as shown in Fig. 4, the backrest 14 is rotatable relative to the seat cushion 12 around the hinge portion 42. This allows the backrest 14 to recline, stand up, and tilt forward.

[0035] Here, the lumbar mat 30 will be described.

[0036] 1 and 2, the lumbar mat 30 of this embodiment includes a pair of left and right metal side wires 44. The left and right side wires 44 are arranged inside the pair of left and right back side frames 34, with their longitudinal direction aligned with the up-down direction of the backrest 14 shown in FIG. 3. The lower ends of the left and right side wires 44 are connected to the lower frame 38 shown in FIG. 3.

[0037] A metal main wire 46 is suspended between the left and right side wires 44 in the seat width direction, and multiple main wires 46 are arranged in the up-and-down direction of the backrest 14. One end of the main wire 46 is swingably engaged with one of the side wires 44, and the other end of the main wire 46 is swingably engaged with the other side wire 44.

[0038] A pair of left and right peaks 46A that protrude upward in a trapezoidal shape are formed on the main wire 46. The formation of the peaks 46A results in the provision of valleys 46B between the peaks 46A, and the alternating formation of the peaks 46A and the valleys 46B makes the main wire 46 elastically deformable, and elastically supports the back (particularly the waist) of the occupant P.

[0039] Additionally, a plurality of hook members 48 are provided on the left and right side wires 44. These hook members 48 are engaged with the back side frames 34. In other words, the lumbar mat 30 is supported by the pair of left and right back side frames 34 (see FIG. 3) via these hook members 48.

[0040] In this embodiment, brackets 50 are attached to the lower end sides of the pair of left and right side wires 44 of the lumbar mat 30. The pair of left and right brackets 50 form a substantially J-shape in plan view.

[0041] Claw portions 52 extend from one end of the bracket 50 to the top and bottom of the bracket 50, and the claw portions 52 are respectively engaged with the side wires 44. With the claw portions 52 engaged with the side wires 44, the bracket 50 extends outward in the seat width direction of the lumbar mat 30 and toward the rear side.

[0042] An axial hole 54 is formed in the seat width direction on the claw portion 52 side of the bracket 50, and a shaft (axis) 56 can be inserted into the axial hole 54. The shaft 56 is provided on a plate-shaped arm 58, and by inserting the shaft 56 into the axial hole 54, the arm 58 can swing around the shaft 56.

[0043] Here, the arm 58 is configured to include an abutment piece 60 and a support piece 62, and the shaft 56 is provided between the abutment piece 60 and the support piece 62. The abutment piece 60 is able to abut against the tip end 50A of the bracket 50, and when the abutment piece 60 is in abutment against the tip end 50A of the bracket 50, the support piece 62 of the arm 58 is restricted from swinging toward the front of the seat. In addition, a coil spring (biasing member) 64 is provided between the shaft 56 and the arm 58, and the biasing force of the coil spring 64 biases the support piece 62 of the arm 58 toward the front of the seat.

[0044] Tip portions 62A of the support pieces 62 of the pair of left and right arms 58 are bent inward in the seat width direction, and a rectangular plate-shaped pelvis support main body 68 that constitutes the pelvis support 66 is attached to tip portions 62A. The pelvis support main body 68 is bridged between the pair of left and right arms 58 along the seat width direction, and a plurality of through holes 70 are formed in the pelvis support main body 68 along the seat width direction.

[0045] (Actions and Effects of Vehicle Seats) Next, the operation and effects of the vehicle seat according to this embodiment will be described.

[0046] 3 and 4, the vehicle seat 10 in this embodiment includes a seat cushion 12, a backrest 14, and a pelvic support 66. The seat cushion 12 supports the buttocks and thighs of the occupant P, and the backrest 14 supports the back of the occupant P. The pelvic support 66 is provided on the backrest 14.

[0047] The backrest 14 is provided with a coil spring 64, and the pelvic support 66 supports the lumbar region of the occupant P with the biasing force of the coil spring 64. As shown in FIG. 4, when the backrest 14 is reclined, the weight of the occupant P causes the pelvic support 66 to retreat rearward in the fore-and-aft direction of the seat against the biasing force of the coil spring 64.

[0048] In this embodiment, the lumbar region of the occupant P is supported via the pelvic support 66 by the force of the coil spring 64, and therefore, as shown in Figure 3, when the backrest 14 is in an upright position, the force of the coil spring 64 acts toward the front of the seat.

[0049] Here, when the backrest 14 is in an upright position, the weight of the occupant P acts on the lower side of the seat and is mainly supported by the seat cushion 12. On the other hand, as shown in Fig. 4, when the backrest 14 is in a reclined position, the weight of the occupant P is distributed between the backrest 14 and the seat cushion 12 and is supported by the backrest 14 and the seat cushion 12. At this time, as described above, the pelvic support 66 is retracted rearward in the front-to-rear direction of the seat against the biasing force of the coil spring 64 due to the weight of the occupant P.

[0050] The load of the occupant P acting on the backrest 14 is greater when the backrest 14 is reclined, as shown in Figure 4, than when the backrest 14 is upright, as shown in Figure 3, and when the backrest 14 is reclined, the backrest 14 sinks in response to the load of the occupant P.

[0051] For example, as a comparative example (not shown), if the position of the pelvic support 66 relative to the backrest 14 is the same when the backrest 14 is upright and when it is reclined, when the backrest 14 is reclined, the backrest 14 sinks, and the pelvic support 66 may come into strong contact with the occupant P.

[0052] For this reason, in this embodiment, when the backrest 14 is reclined, the weight of the occupant P causes the pelvic support 66 to retreat rearward in the front-to-rear direction of the seat against the biasing force of the coil spring 64. As a result, in this embodiment, the possibility that the pelvic support 66 will come into strong contact with the occupant P is reduced, making it possible to suppress any discomfort felt by the pelvic support 66.

[0053] Here, the backrest 14 has a framework formed by a frame-shaped back frame 26, and in this embodiment, a lumbar mat 30 is disposed inside the back frame 26. The lumbar mat 30 supports the back of the occupant P.

[0054] In this embodiment, the pelvic support 66 is provided at the lower end of the lumbar mat 30 and is supported so as to be swingable around a shaft 56 provided along the seat width direction relative to the lumbar mat 30 via a coil spring 64.

[0055] In other words, the pelvis support 66 is biased toward the front side of the seat around the shaft 56 by the biasing force of the coil spring 64, and is set so that when the weight of the occupant P acts on it, it retreats (swings) toward the rear side of the seat around the shaft 56 against the biasing force of the coil spring 64. In this way, in this embodiment, the biasing force of the coil spring 64 is used to swing the pelvis support 66, so the configuration is simple and can be implemented at low cost.

[0056] To explain the pelvic support 66 in more detail, the pelvic support 66 is composed of a pelvic support main body 68, a pair of brackets 50, and a pair of arms 58, and the pelvic support main body 68 supports the lumbar region of the occupant P.

[0057] In this embodiment, the pair of brackets 50 are respectively provided at the ends in the seat width direction at the lower end of the lumbar mat 30. Each of the pair of brackets 50 is provided with an arm 58 that can swing around a shaft 56 that is provided along the seat width direction, and a pelvis support body 68 is supported by the pair of arms 58.

[0058] With the above-described configuration, in this embodiment, when the backrest 14 is upright, the pelvic support body 68 swings toward the front of the seat around the shaft 56 via a pair of arms 58 due to the biasing force of the coil spring 64, and the pelvic support body 68 supports the lower back of the occupant P.

[0059] On the other hand, when the backrest 14 is reclined and the weight of the occupant P acts on the pelvic support body 68, the pair of arms 58 swings toward the rear of the seat around the shaft 56 via the pelvic support body 68 against the biasing force of the coil spring 64, and the pelvic support body 68 retracts.

[0060] In this way, in this embodiment, it is possible to provide a pelvic support 66 at the lower end of the lumbar mat 30, so there is no need to perform post-processing on the back frame 26 to provide the pelvic support 66, making it possible to do this at low cost.

[0061] Furthermore, in this embodiment, the pair of arms 58 are configured to include a pair of shafts 56, a pair of support pieces 62, and a pair of abutment pieces 60. A coil spring 64 is provided on each of the pair of shafts 56. A pelvis support body 68 is supported by the pair of support pieces 62. Furthermore, the pair of abutment pieces 60 are provided on opposite sides of the support pieces 62 with the shaft 56 as the center, and abut against the pair of brackets 50 with the pelvis support body 68 being biased forward in the seat front-rear direction.

[0062] In this embodiment, the biasing force of the coil spring 64 changes depending on the position of the pelvis support body 68 in the fore-and-aft direction of the seat, so by setting the position of the pelvis support body 68 with the abutment piece 60 abutting against the bracket 50, the support force of the pelvis support body 68 on the lumbar region of the occupant P can be maintained.

[0063] In this embodiment, the abutment piece 60 is provided on the opposite side of the support piece 62 with the shaft 56 at the center, but this is not limited to this. For example, the shapes of the arm 58 and the bracket 50 can be changed as appropriate, and the positional relationship between the abutment piece 60 and the support piece 62 can be changed depending on the positional relationship between the arm 58 and the bracket 50.

[0064] Although the present invention has been described above by way of examples, these examples are merely examples and can be modified in various ways without departing from the spirit of the invention. It goes without saying that the scope of the present invention is not limited to these examples. [Explanation of symbols]

[0065] 10 Vehicle seats 12 seat cushions 14 Backrest 26 Back frame (frame, backrest) 30 Lumbar mat (supporting member, backrest) 50 Bracket (pelvic support) 56 Shaft (axis, shaft, arm) 58 Arm (pelvic support) 60 Contact piece (arm) 62 Support piece (arm) 64 Coil spring (biasing member) 66 Pelvic Support 68 Pelvic support body (pelvic support) P crew

Claims

1. a seat cushion that supports the buttocks and thighs of an occupant; a backrest that supports the back of the occupant; a pelvis support that is provided on the backrest, supports the lumbar region of the occupant by the biasing force of a biasing member provided on the backrest, and retreats rearward in the seat front-rear direction against the biasing force of the biasing member due to the weight of the occupant when the backrest is reclined; A vehicle seat comprising:

2. The backrest is A frame-shaped frame that forms a skeleton of the backrest; a support member disposed inside the frame and supporting a back of the occupant; The invention comprises:

2. The vehicle seat according to claim 1, wherein the pelvis support is provided at a lower end of the support member and is supported to be swingable relative to the support member via the biasing member about an axis along the seat width direction.

3. the support member is a lumbar mat attached to the frame and supporting the back of the occupant, The pelvic support includes: a pelvis support body that supports the lumbar region of the occupant; A pair of brackets are provided at the ends of the lower end of the lumbar mat in the seat width direction, a pair of arms that are pivotally provided on the pair of brackets around an axis along the seat width direction and support the pelvis support body; 3. The vehicle seat according to claim 2, further comprising:

4. The pair of arms a pair of shaft portions each provided with the biasing member; A pair of support pieces that support the pelvic support body; a pair of abutment pieces that abut against the pair of brackets, respectively, when the pelvis support body is biased forward in the seat front-rear direction; 4. The vehicle seat according to claim 3, further comprising:

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