Vehicle seat

Abstract

To provide a vehicle seat which can regulate a deformation amount of a cushion spring without generating noise when an occupant is seated thereon.SOLUTION: A resin-made deformation regulation member 30 is provided in a sheet longitudinal direction intermediate region 22M of a plurality of cushion springs 22. The deformation regulation member 30 has cross-linking parts 32 for connecting mutually adjacent parts in a spring cross-linking direction (refer to an X direction of an arrow 22) in wavy parts 22A in the sheet longitudinal direction intermediate region 22M of the plurality of cushion springs 22, and the cross-linking parts 32 have curved parts 32B which are bent so as to form a projection on a sheet lower side and are elastically deformable. The deformation regulation member 30 regulates a predetermined amount or more of bending deformation of the wavy parts 22A in the sheet longitudinal direction intermediate region 22M of the plurality of cushion springs 22 by the cross-linking parts 32 having the curved parts 32B.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] A structure in which cushion springs are suspended across a seat cushion frame is known for seat cushions for vehicle seats. For example, the following Patent Document 1 discloses a structure in which multiple springs (cushion springs) are suspended between a front frame and a rear frame (rear frame) and a pad (cushion pad) is disposed above the springs, and the multiple springs are configured to bend in response to the load of a seated occupant acting on the pad. In this prior art structure, an engagement portion is provided on the front frame or the like, and the engagement portion is configured to engage with a part of the spring when the spring is bent by a predetermined amount, thereby suppressing the bending deformation of the spring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-90175 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such a structure, when the flexural deformation of the spring is suppressed, the engaging portion comes into contact with a part of the spring, generating abnormal noise.

[0005] In consideration of the above, an object of the present invention is to provide a vehicle seat that can regulate the amount of deformation of a cushion spring without generating abnormal noise when an occupant sits in the seat. [Means for solving the problem]

[0006] The vehicle seat of the present invention described in claim 1 includes a seat cushion frame constituting a framework of a seat cushion on which an occupant sits, a plurality of cushion springs that are bridged across the seat cushion frame and have corrugated portions that are alternately bent into a U-shape in plan view that is open to one side in a horizontal direction perpendicular to a bridge direction and a U-shape in plan view that faces the opposite direction, a cushion pad that is elastically supported from a lower side of the seat by the plurality of cushion springs, and bridging portions that are provided in at least a partial region of the plurality of cushion springs and connect portions of the corrugated portions that are adjacent to each other in the bridge direction in the at least partial region, the bridging portions being disposed on the lower side of the seat. To and a deformation restricting member made of resin, the deformation restricting member having a bent portion that is bent to form an elastically deformable bend, and restricting a bending deformation of the corrugated portion in at least a partial region by a bridging portion having the bent portion, the bending portion being prevented from bending by a predetermined amount or more. The bridging portion has a fixed portion fixed to the corrugated portion, and a curved portion that connects adjacent fixed portions in the spanning direction, constitutes the bent portion, and is formed in a curved shape that is convex overall toward the lower side of the seat when viewed in a horizontal direction perpendicular to the spanning direction, and the deformation control member has a plurality of the bridging portions, and each of the plurality of bridging portions has a horizontal central portion perpendicular to the spanning direction that is located inside the U-shaped portion of the corrugated portion in a planar view and is shifted toward the open side of the U-shaped portion with respect to the horizontal central position perpendicular to the spanning direction in the inner region of the U-shaped portion in a planar view.

[0007] According to the above configuration, in the seat cushion on which an occupant sits, a plurality of cushion springs are spanned across the seat cushion frame constituting the skeleton, and the cushion pad is elastically supported from the lower side of the seat by the plurality of cushion springs. The cushion springs have wave-shaped portions that are alternately bent into a U-shape in plan view that is open on one side in the horizontal direction perpendicular to the span direction and into a U-shape in the opposite direction in plan view, and the cushion springs as a whole are flexibly deformed by elastic deformation of the wave-shaped portions.

[0008] Here, a deformation restricting member made of resin is provided on at least a portion of the region of the plurality of cushion springs, and the deformation restricting member has a wave-shaped portion in the at least a portion of the region. The bridge portion is provided on the lower side of the seat to connect adjacent portions in the bridge direction. ToWhen an occupant sits on the seat cushion and a load acts from the cushion pad to the multiple cushion springs downward, the deformation restricting member restricts the bending deformation of the corrugated portion in at least a predetermined amount in the at least a portion of the region while allowing the bending deformation of the corrugated portion in at least a portion of the region within a range in which the bending portion of the bridging portion can elastically deform. In addition, since the deformation restricting member is not a member that comes into contact with or separates from the cushion springs, no abnormal noise is generated between the cushion springs and the deformation restricting member when the deformation restricting member restricts the bending deformation of the cushion springs.

[0010] In addition, this vehicle seat According to the above, when an occupant sits on the seat cushion and a load acts from the cushion pad to the multiple cushion springs downward, the cushion springs attempt to elastically deform so as to expand the pitch of the corrugated portions, and the force of this elastic deformation causes the curved portions of the bridging portions of the deformation restriction member to elastically deform into a substantially linear shape. Therefore, the corrugated portions in at least a portion of the region are allowed to flex by the amount of elastic deformation of the curved portions. After the curved portions of the bridging portions of the deformation restriction member elastically deform into a substantially linear shape and cannot be elastically deformed any further, the flexural deformation of the corrugated portions in at least a portion of the region is restricted by the bridging portions in a tensioned state. In this way, when an occupant sits on the seat, the deformation restriction member only causes the curved portions of the bridging portions to elastically deform from a curved shape into a substantially linear shape, so that it is easy to precisely restrict the amount of flexural deformation of the corrugated portions. In addition, in this vehicle seat, the deformation control member has a plurality of bridging portions, and each of the plurality of bridging portions has a horizontal central portion perpendicular to the bridge direction among the portion located inside the U-shaped portion of the corrugated portion in a planar view, which is shifted toward the open side of the U-shaped portion with respect to the horizontal central position perpendicular to the bridge direction in the inner region of the U-shaped portion in a planar view.

[0011] Claim 2 The vehicle seat of the present invention described in claim 1 to In the described configuration, the deformation restricting member and the cushion spring are integrally formed.

[0012] According to the above configuration, the number of parts can be reduced compared to a case in which the deformation restricting member and the cushion spring are separate members. Effect of the Invention

[0015] As described above, the vehicle seat of the present invention has the excellent effect of being able to regulate the amount of deformation of the cushion spring without generating abnormal noise when an occupant sits in the seat. [Brief description of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a vehicle seat according to a first embodiment. [Diagram 2] 2 is a perspective view showing a part of the seat cushion in FIG. 1 below a cushion pad. FIG. [Diagram 3] 3 is an enlarged vertical sectional view showing a part of the seat cushion of FIG. 1 cut at a position corresponding to line 3-3 of FIG. 2. [Figure 4] FIG. 11 is a plan view showing a cushion spring assembly that is applied to a vehicle seat according to a second embodiment. [Diagram 5] FIG. 4 is a plan view showing a schematic view of a cushion spring in an expanded state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [First embodiment] No. A vehicle seat according to a first embodiment will be described with reference to FIGS. 1 to 3. The first embodiment is not an embodiment of the present invention but a reference example. In the drawings, an arrow FR appropriately indicates the front side of the seat, an arrow UP indicates the upper side of the seat, and an arrow W indicates the width direction of the seat.

[0018] (Configuration of this embodiment) 1 shows a perspective view of a vehicle seat 10 according to this embodiment. The vehicle seat 10 has a seat body 10H. The seat body 10H includes a seat cushion 12 that constitutes a seating portion on which an occupant sits and supports the buttocks and thighs of the seated occupant, a seat back 14 that supports the back of the seated occupant, and a headrest 16 that supports the head of the seated occupant.

[0019] The structure of the seat cushion 12 will be described in detail. Fig. 2 shows a perspective view of a portion of the seat cushion 12 below a cushion pad 24 (see Fig. 3) described later. Fig. 3 shows an enlarged vertical cross-sectional view of a portion of the seat cushion in Fig. 1 cut at a position corresponding to line 3-3 in Fig. 2.

[0020] 2 and 3, the seat cushion 12 includes a seat cushion frame 20 that constitutes the framework of the seat cushion 12, a plurality of cushion springs 22 (see FIG. 2) that are spanned across the seat cushion frame 20, and a cushion pad 24 (see FIG. 3) that is elastically supported from the lower side of the seat by the plurality of cushion springs 22. Although not shown in FIG. 3, the surface of the cushion pad 24 is covered with a skin.

[0021] As shown in Fig. 2, the seat cushion frame 20 includes a pair of left and right side frames 20S that form both sides of the seat cushion 12 in the seat width direction and are arranged with the seat front-rear direction as the longitudinal direction. In Fig. 2, for the sake of convenience, the pair of left and right side frames 20S are diagrammatically illustrated and their outer shapes are indicated by two-dot chain lines. The front ends of the pair of left and right side frames 20S are connected to each other in the seat width direction by a front frame 20F that is a part of the seat cushion frame 20. The portion formed by the pair of left and right side frames 20S and the front frame 20F may be referred to as a frame main body 20A.

[0022] Further, rear end portions of the pair of left and right side frames 20S are connected to each other in the seat width direction by a pipe-shaped rear frame 20R which is a part of the seat cushion frame 20. For convenience, the rear frame 20R is indicated by a two-dot chain line in Fig. 2.

[0023] A plurality of metallic cushion springs 22 (three in this embodiment as an example) are stretched between the front frame 20F and the rear frame 20R. In the following description, the stretching direction of the plurality of cushion springs 22 is appropriately abbreviated as the "spring stretching direction", and in the drawings, the spring stretching direction is indicated by the symbol 22X. The cushion springs 22 have a wave-shaped portion 22A that is alternately bent into a U-shape in plan view that is open to one side in the horizontal direction perpendicular to the stretching direction (see the direction of the arrow 22X) and a U-shape in the opposite direction, and are sometimes referred to as S-springs.

[0024] The front end 22F of the cushion spring 22 is fixed to a mounting portion 20F1 formed on the rear of the front frame 20F while being covered with a resin material 26A. The rear end 22R of the cushion spring 22 is formed in a substantially inverted U-shape in a seat side view, covered with a resin material 26B, and is integrally formed with a resin stopper 26C (shown in a simplified form in the figure), and is fixed to the rear frame 20R. The multiple cushion springs 22 are arranged in parallel at a predetermined interval in the seat width direction. As shown in FIG. 3, the cushion springs 22 are arranged along the lower surface 24A of the cushion pad 24.

[0025] 2, a resin front panel 26F extending in a band shape in the seat width direction is integrally molded on the front portions of the cushion springs 22. The front panel 26F connects the front portions of the multiple cushion springs 22 in the seat width direction. In addition, a resin rear panel 26R extending in the seat width direction is integrally molded on the rear portions of the cushion springs 22. The rear panel 26R connects the rear portions of the multiple cushion springs 22 in the seat width direction.

[0026] A resin deformation restricting member 30 is provided in the seat front-rear direction intermediate region 22M of the plurality of cushion springs 22. As an example, a plurality of deformation restricting members 30 are provided, and one is fixed to each of the plurality of cushion springs 22. The deformation restricting member 30 includes bridging portions 32 that connect adjacent portions in the spring bridge direction (see the direction of arrow 22X) of the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the plurality of cushion springs 22. In this embodiment, each of the plurality of deformation restricting members 30 extends in the spring bridge direction (see the direction of arrow 22X) in a plan view, and includes a plurality of bridging portions 32.

[0027] 2 and 3, the bridge portion 32 includes a fixed portion 32A fixed to the corrugated portion 22A, and a curved portion 32B as a bent portion connecting adjacent fixed portions 32A in the spring bridge direction (see the direction of the arrow 22X). The curved portion 32B is formed in a curved shape (bent in an arc) so as to be convex toward the seat lower side as a whole when viewed in a horizontal direction perpendicular to the spring bridge direction (see the direction of the arrow 22X), and is configured to be elastically deformable. When an occupant is not seated on the seat cushion 12, the deformation restriction member 30 is configured so that no load is applied from the cushion spring 22.

[0028] The deformation restricting member 30 described above restricts the bending deformation of the corrugated portions 22A of the plurality of cushion springs 22 in the seat front-rear direction intermediate region 22M by the bridging portions 32 having the curved portions 32B, the bending deformation being greater than a predetermined amount.

[0029] In this embodiment, the deformation restriction member 30 and the cushion spring 22 are integrally molded. That is, the deformation restriction member 30 is molded at the same time as the front resin material 26A, the rear resin material 26B, the front panel 26F, the rear panel 26R, and the retaining device 26C shown in Fig. 2 are integrally molded with the cushion spring 22. The cushion spring 22, the front resin material 26A, the rear resin material 26B, the front panel 26F, the rear panel 26R, the retaining device 26C, and the deformation restriction member 30 constitute a cushion spring assembly 40.

[0030] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0031] In the seat cushion 12, a plurality of cushion springs 22 are spanned across a seat cushion frame 20, and a cushion pad 24 (see FIG. 3) is elastically supported from the lower side of the seat by the plurality of cushion springs 22. The cushion springs 22 are provided with wave-shaped portions 22A that are alternately bent into a U-shape in plan view that is open on one side in a horizontal direction perpendicular to the span direction (see the direction of arrow 22X) and a U-shape in the opposite direction, and the cushion springs 22 are elastically deformed to bend and deform as a whole.

[0032] Here, a resin deformation restricting member 30 is provided in the seat front-rear direction intermediate region 22M of the cushion springs 22, and the deformation restricting member 30 includes a bridging portion 32 that connects adjacent portions of the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the cushion springs 22 in the spring bridge direction (see the direction of the arrow 22X) of the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the cushion springs 22, and the bridging portion 32 has a curved portion 32B that is bent to form a convex shape toward the seat lower side and is elastically deformable. When an occupant sits on the seat cushion 12 and a load acts on the cushion springs 22 from the cushion pad 24 (see FIG. 3) toward the seat lower side, the deformation restricting member 30 restricts the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the cushion springs 22 from being bent by a predetermined amount or more. Furthermore, since the deformation restriction member 30 is not a member that comes into contact with or separates from the cushion spring 22, no abnormal noise is generated between the cushion spring 22 and the deformation restriction member 30 when the deformation restriction member 30 restricts the bending deformation of the cushion spring 22.

[0033] The suppression of the bending deformation of the cushion spring 22 will be described more specifically. As described above, the bridge portion 32 includes the fixed portion 32A fixed to the corrugated portion 22A and the curved portion 32B connecting the adjacent fixed portions 32A in the spring bridge direction (see the direction of the arrow 22X), and the curved portion 32B is formed in a curved shape that is convex toward the seat lower side as a whole when viewed in a horizontal direction perpendicular to the spring bridge direction (see the direction of the arrow 22X). In this configuration, when an occupant sits on the seat cushion 12 and a load acts on the cushion springs 22 from the cushion pad 24 (see FIG. 3) toward the seat lower side, the cushion spring 22 tries to elastically deform so as to expand the pitch of the corrugated portion 22A, and the curved portion 32B of the bridge portion 32 of the deformation restriction member 30 elastically deforms in a substantially linear shape due to the force. Therefore, the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the plurality of cushion springs 22 is allowed to bend by the amount of elastic deformation of the curved portion 32B. After the curved portion 32B of the bridging portion 32 of the deformation restriction member 30 is elastically deformed into a substantially linear shape and cannot be elastically deformed any further, the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the plurality of cushion springs 22 is restricted from bending by the bridging portion 32 in a tensioned state. In this way, when an occupant is seated, the deformation restriction member 30 simply causes the curved portion 32B of the bridging portion 32 to be elastically deformed from a curved shape into a substantially linear shape, so that it is easy to precisely restrict the amount of bending deformation of the corrugated portion 22A.

[0034] As described above, according to the vehicle seat 10 of the present embodiment, the deformation amount of the cushion spring 22 can be restricted without generating abnormal noise when an occupant is seated.

[0035] Here, a supplementary explanation will be given in comparison with the conventional technology. For example, in the conventional technology disclosed in Figs. 3 to 5 of the above Patent Document 1 (JP Patent Publication No. 2020-90175), when an occupant sits down, an engagement portion engages with a part of the front frame side of the spring (cushion spring), and only the deformation stroke of the front frame side of the spring is restricted, so that the part of the spring rearward of the seat from the part where the engagement portion engages is elastically deformed in response to the load. In contrast, in the present embodiment, the bridging portion 32 of the deformation restriction member 30 is provided not only in the front part but also in the rear part of the corrugated portion 22A of the cushion spring 22, and further, in the region where the bridging portion 32 of the deformation restriction member 30 is provided in the corrugated portion 22A of the cushion spring 22, elastic deformation can be suppressed for each pitch of the corrugated portion 22A.

[0036] In addition, in the conventional technology, the engaging portion is provided on the front frame, and in order to increase the length from the main body of the front frame to the hook portion at the tip of the engaging portion, a corresponding strength is required, so it is not necessarily easy to increase the length. In contrast, when the structure of this embodiment is adopted, it is easy to provide the bridging portion 32 of the deformation restricting member 30 not only in front of the corrugated portion 22A of the cushion spring 22 but also in the rear thereof.

[0037] Furthermore, when a structure such as that of this embodiment is employed, it is easy to change the length of the deformation restriction member 30 including the bridging portion 32 in the spring bridge direction (see the direction of the arrow 22X), and it is also easy to fix the deformation restriction member whose length has been changed in this way to a desired position on the cushion spring 22. Therefore, it is easy to suppress the deformation of the cushion spring 22 within a desired range.

[0038] As a result, it becomes possible to appropriately set the lower limit position of the seat cushion 12. For example, even if the position of the vehicle floor surface is set high in an electric vehicle in order to mount a battery under the vehicle floor, it becomes possible to adequately secure the space between the seat cushion 12 and the vehicle floor surface by setting the lower limit position of the seat cushion 12 in accordance with the setting.

[0039] In addition, in this embodiment, the deformation of the cushion spring 22 is suppressed by the deformation restricting member 30 made of resin, so that an increase in cost and mass can be suppressed.

[0040] In this embodiment, the deformation restricting member 30 and the cushion spring 22 are integrally formed, which reduces the number of parts.

[0041] In this embodiment, the deformation restricting member 30 does not damage the cushion pad 24 when the cushion pad 24 (see FIG. 3) and the cushion spring 22 are deflected.

[0042] Furthermore, while the engagement portion in the prior art is provided on the front frame, the deformation control member 30 in this embodiment is not provided on the front frame 20F, and therefore does not reduce the yield of the front frame 20F.

[0043] [Second embodiment] next , No. A vehicle seat according to a second embodiment will be described with reference to FIGS. The second embodiment is an embodiment of the present invention. FIG. 4 is a plan view of a cushion spring assembly 58 that is applied to the vehicle seat 50 according to this embodiment.

[0044] As shown in Fig. 4, the vehicle seat 50 according to this embodiment differs from the vehicle seat 10 according to the first embodiment (see Fig. 1) in that it includes a cushion spring assembly 58 instead of the cushion spring assembly 40 (see Fig. 2) of the first embodiment. The other configurations are similar to those of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals and will not be described.

[0045] In Fig. 4, the outline of the seat cushion 52 in the vehicle seat 50 is simplified and indicated by a two-dot chain line. The seat cushion 52 has the same configuration as the seat cushion 12 (see Figs. 1 to 3) of the first embodiment, except that the seat cushion 52 includes a cushion spring assembly 58 instead of the cushion spring assembly 40 (see Fig. 2) of the first embodiment.

[0046] 4, the cushion spring assembly 58 includes a cushion spring 22, a front resin material 26A, a rear resin material 26B, a front panel 26F, a rear panel 26R, a retaining member 26C, and a resin deformation restriction member 60. That is, the cushion spring assembly 58 has a similar configuration to the cushion spring assembly 40 (see FIG. 2) of the first embodiment, except that it includes the deformation restriction member 60 instead of the deformation restriction member 30 (see FIG. 2) of the first embodiment.

[0047] The deformation restriction member 60 is integrally molded with the cushion spring 22. That is, the deformation restriction member 60 is molded at the same time that the front resin material 26A, the rear resin material 26B, the front panel 26F, the rear panel 26R, and the retaining member 26C are integrally molded with the cushion spring 22.

[0048] The deformation restriction member 60 is provided in the seat front-rear direction intermediate region 22M of the multiple cushion springs 22. As an example, multiple deformation restriction members 60 are provided, and one is fixed to each of the multiple cushion springs 22. The deformation restriction member 60 includes bridging portions 62 that connect adjacent portions in the spring bridge direction (see the direction of arrow 22X) of the corrugated portion 22A in the seat front-rear direction intermediate region 22M of the multiple cushion springs 22. In this embodiment, each of the multiple deformation restriction members 60 includes multiple bridging portions 62.

[0049] The bridging portion 62 includes a fixed portion 62A fixed to the corrugated portion 22A and a curved portion 62B as a bent portion connecting the adjacent fixed portions 62A in the spring bridge direction (see the direction of the arrow 22X) in the same manner as the bridging portion 32 in the first embodiment (see FIGS. 2 and 3). Although detailed illustration is omitted, the curved portion 62B is formed in a curved shape (bent in an arc shape) so as to be convex toward the seat lower side as a whole when viewed in a horizontal direction perpendicular to the spring bridge direction (see the direction of the arrow 22X) in the same manner as the curved portion 22B in the first embodiment (see FIGS. 2 and 3), and is configured to be elastically deformable. In addition, when an occupant is not seated on the seat cushion 12, the deformation restriction member 60 is configured so that no load is applied from the cushion spring 22.

[0050] Further, each of the bridge portions 62 extends in the spring bridge direction (see the direction of the arrow 22X) in a plan view. In this embodiment, each of the bridge portions 62 is set so that a portion 62X (hereinafter, appropriately abbreviated as "inner position portion 62X") located inside the U-shaped portion 22U of the corrugated portion 22A in a plan view is located on the open side of the U-shaped portion 22U in a plan view (hereinafter, appropriately abbreviated as "U-shaped open side"). That is, in a plan view, the bridge portion 62 has a widthwise center portion (a center portion in a direction perpendicular to the spring bridge direction (see the direction of the arrow 22X)) 62X1 of the inner position portion 62X in the inner region of the U-shaped portion 22U that is shifted toward the open side of the U-shaped portion 22U with respect to a center position (see the imaginary center line 100 in the figure) in a direction perpendicular to the spring bridge direction (see the direction of the arrow 22X) in the inner region of the U-shaped portion 22U.

[0051] 4, the length L shown near the center of the drawing indicates the length in the direction perpendicular to the spring bridge direction (see the direction of arrow 22X) in the inner region of U-shaped portion 22U in plan view. Also, imaginary center line 100 is an imaginary straight line passing through the center position (position L / 2) in the length direction of length L in the inner region of U-shaped portion 22U in plan view. Needless to say, in plan view, side surface 62X2 located on the U-shaped opening side of inner position portion 62X of bridge portion 62 is set on the opening side of U-shaped portion 22U relative to imaginary center line 100.

[0052] As a result, in each cushion spring 22, the multiple bridging portions 62 are arranged alternately so as to be shifted in a direction perpendicular to the spring bridge direction (see the direction of the arrow 22X) in a plan view. Also, in each cushion spring 22, the multiple bridging portions 62 arranged alternately are connected to the nearest ones. Note that, in a portion where the nearest bridging portions 62 are separated from each other in a direction perpendicular to the spring bridge direction (see the direction of the arrow 22X), a connecting portion 62C is provided to connect the fixed portions 62A arranged in the direction perpendicular to the spring bridge direction (see the direction of the arrow 22X).

[0053] The deformation restricting member 60 described above restricts the bending deformation of the corrugated portions 22A in the seat front-rear direction intermediate region 22M of the plurality of cushion springs 22 by the bridging portions 62 having the curved portions 62B, the bending deformation being greater than a predetermined amount.

[0054] The configuration of this embodiment also provides the same action and effect as the first embodiment described above. In this embodiment, the bridge portions 62 are set so that the portion 62X located inside the U-shaped portion 22U of the corrugated portion 22A in a plan view is located on the open side of the U-shaped portion 22U in a plan view. Therefore, in the bridge portion 62 of this embodiment, when the cushion spring 22 expands, the elastic deformation amount in the pitch expansion direction of the corrugated portion 22A becomes large while the input load becomes small, which is advantageous in terms of strength, compared to a bridge portion in which the portion located inside the U-shaped portion (22U) of the corrugated portion (22A) in a plan view is located on the opposite side to the open side of the U-shaped portion (22U) in a plan view.

[0055] In addition, in this embodiment, the dimensional accuracy of the bridge portion 62 can be relaxed. This point will be described with reference to FIG. 5. FIG. 5 shows a schematic plan view of the cushion spring 22 in an expanded state. As shown in FIG. 5, when the cushion spring 22 is expanded, the pitch is enlarged toward the front of the U-shaped portion 22U (see both arrows A and B). For this reason, for example, in the figure, a bridge portion (not shown) set to connect a portion close to the front of the U-shaped portion 22U (a portion corresponding to both ends of the arrow B) can be set to have a larger protrusion amount of the curved portion of the bridge portion toward the seat lower side compared to a bridge portion (not shown) set to connect a portion far from the front of the U-shaped portion 22U (a portion corresponding to both ends of the arrow A), and the dimensional accuracy can be relaxed. In other words, in this embodiment, the dimensional accuracy of the bridge portion 62 shown in FIG. 4 can be relaxed.

[0056] In this embodiment, since the multiple bridging portions 62 provided alternately on each cushion spring 22 are integrated, it is possible to minimize the number of injection holes for injecting resin that are set in a mold for molding the cushion spring assembly 58. Furthermore, since the multiple bridging portions 62 provided alternately on each cushion spring 22 are integrated, it is also possible to position each cushion spring 22 in the width direction (direction perpendicular to the spring bridge direction (see arrow 22X direction)) (prevent positional deviation), so that the performance of the deformation restriction member 60 can be stably exhibited.

[0057] [Supplementary explanation of the embodiment] In the above embodiment, the multiple cushion springs 22 are bridged between the front frame 20F and the rear frame 20R, but the multiple cushion springs may be bridged between a pair of left and right side frames (22S) of the seat cushion frame (20). In the above embodiment, a part of the cushion spring 22 is the corrugated portion 22A, but the entire cushion spring may be the corrugated portion (22A).

[0058] In addition, in the above embodiment, the resin deformation control members 30, 60 having bridging portions 32, 62 are attached one by one to each of the multiple cushion springs 22 and are provided in the seat fore-aft direction intermediate region 22M of the multiple cushion springs 22, but the range in which the resin deformation control members having bridging portions are provided is not limited to this, and it is sufficient that they are provided in at least a portion of the region of the multiple cushion springs (22).

[0059] In the above embodiment, the bridging portions 32, 62 of the resin deformation restriction members 30, 60 have the curved portions 32B, 62B that are bent to form a convex shape toward the lower side of the seat and are elastically deformable. As a reference example that is not an embodiment of the present invention, The bridging portion of the resin deformation restricting member may have a bent portion that is bent to form a convex shape in a horizontal direction perpendicular to the bridging direction of the plurality of cushion springs (22) and is elastically deformable. As a reference example that is not an embodiment of the present invention,The bridge portion of the resin deformation restricting member may be provided with an elastically deformable bellows-shaped portion.

[0060] The position, shape, thickness, etc. of the deformation restricting member can be set as desired according to various needs for suppressing deformation of the cushion spring 22. It goes without saying that the deformation amount and damping characteristic of the cushion spring assembly 40, 58 can be adjusted by setting the position, shape, thickness, etc. of the deformation restricting member as desired.

[0061] In addition, in the above embodiment, the deformation restriction members 30, 60 and the cushion spring 22 are integrally formed, but the deformation restriction members may be formed separately from the cushion spring 22 and fixed to the cushion spring 22.

[0062] In addition, in the above embodiment, the deformation restriction members 30, 60 are configured so that no load is applied from the cushion spring 22 when an occupant is not seated on the seat cushion 12. However, for example, the structure may be such that when an occupant is not seated on the seat cushion (12), a load is applied from the cushion spring (22) to the deformation restriction members (30, 60), but the load is of a magnitude that does not elastically deform the deformation restriction members (30, 60).

[0063] The above-described embodiment and the multiple modified examples can be implemented in appropriate combinations.

[0064] While one example of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0065] 10 Vehicle seats 12 Seat cushion 20 Seat cushion frame 22 Cushion spring 22A corrugated section 22M Seat front-rear center area (at least part of the area) 22U U-shaped part 22X Spring installation direction (installation direction) 24 Cushion Pad 30 Deformation control member 32 Bridge part 32A Fixed part 32B Curved section (bent section) 50 Vehicle seats 52 Seat Cushion 60 Deformation control member 62 Crosslinked part 62A Fixed part 62B Curved section 62X The area located inside the U-shaped part of the corrugated section in plan view

Claims

1. a seat cushion frame that constitutes a framework of a seat cushion on which an occupant sits; A plurality of cushion springs are bridged across the seat cushion frame and have wave-shaped portions that are alternately bent into a U-shape in plan view that is open on one side in a horizontal direction perpendicular to the bridge direction and a U-shape in the opposite direction in plan view; a cushion pad that is elastically supported from a lower side of the seat by the plurality of cushion springs; a resin deformation restriction member provided in at least a portion of the plurality of cushion springs, the resin deformation restriction member including a bridging portion that connects adjacent portions of the corrugated portion in the bridging direction in the at least a portion of the region, the bridging portion having a bent portion that is bent to form a convex shape toward the seat lower side and is elastically deformable, the bridging portion having the bent portion restricting bending deformation of the corrugated portion in the at least a portion of the region beyond a predetermined amount by the bridging portion; having The cross-linking portion is A fixed portion fixed to the corrugated portion; A curved portion that connects the fixed portions adjacent to each other in the bridging direction, constitutes the bent portion, and is curved so as to be convex toward the lower side of the seat as a whole when viewed in a horizontal direction perpendicular to the bridging direction; having the deformation control member includes a plurality of bridging portions, and each of the plurality of bridging portions has a horizontal central portion that is located inside the U-shaped portion of the corrugated portion in a planar view and is perpendicular to the bridge direction, the horizontal central portion being shifted toward the open side of the U-shaped portion relative to a horizontal central position in the inner region of the U-shaped portion in a planar view and perpendicular to the bridge direction.

2. 2. The vehicle seat according to claim 1, wherein the deformation restricting member and the cushion spring are integrally formed.

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