Seat frame and vehicle seat

Abstract

To obtain a seat frame which enables improvement of vibration damping performance and can prevent or inhibit occurrence of abnormal noise, and to obtain a vehicle seat.SOLUTION: In a seat frame, a vibration damping member 32 is fitted into each attachment hole 26H used for attachment of a front end 30F of a seat cushion spring 30 and the front end 30F of the seat cushion spring 30 is inserted into an insertion hole 32H formed at the vibration damping member 32 to be fixed. Further, the vibration damping member 32 protrudes from the upper surface 26A1 side and the lower surface 26A2 side of an upper plate part 26A of a front frame 26. When the front end 30F of the seat cushion spring 30 moves in an arrow A direction, the vibration damping member 32 elastically deforms to damp elastic displacement of the seat cushion spring 30.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] The following Patent Document 1 discloses a vehicle seat including a frame member, a spring member installed across one and the other of the frame member, and a pad member whose back surface is supported by the spring member. In this seat, for example, a damper member is disposed below a straight portion of the spring member near the end (see Figures 2 and 3 of Patent Document 1), and this damper member damps the elastic displacement of the spring member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-231434 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above prior art has room for improvement in terms of vibration damping performance, and there is a possibility that abnormal noise may occur between the hook-shaped clamp that hooks onto the end of the spring member and the end of the spring member.

[0005] In consideration of the above, an object of the present invention is to provide a seat frame and a vehicle seat that can improve vibration damping performance and prevent or suppress the generation of abnormal noise. [Means for solving the problem]

[0006] The seat frame of the present invention as set forth in claim 1 is a seat cushion of a vehicle seat. N Forms the skeleton, On the part with the top surface facing upwardsA frame body portion having a panel member with a mounting hole formed therethrough, and a frame member having an end portion that is bridged over the frame body portion and has an end portion The seat is bent downwards and a spring that passes through the mounting hole; and a vibration damping member that is attached to the panel member while being fitted into the mounting hole, protruding from both sides of the panel member, having insertion holes into which ends of the spring are inserted and fixed, and that damps elastic displacement of the spring by elastic deformation. a support member fixed to the panel member and including a support wall portion that contacts an outer circumferential side of the vibration damping member around a portion of the end of the spring that passes through the mounting hole; With The support wall portion has a pair of opposing wall portions that face each other in a direction along the bridge direction of the spring and that are flat in a direction perpendicular to the bridge direction of the spring in a plan view, and a connecting wall portion that connects one end of the pair of opposing wall portions in a direction perpendicular to the bridge direction as seen in the penetrating direction of the mounting hole, and is bent in a substantially U-shape so that the other side in the direction perpendicular to the bridge direction of the pair of opposing wall portions as seen in the penetrating direction of the mounting hole is open.Furthermore, the support member includes a pair of mounting portions that are fixed to the underside of the panel member on both sides in the same direction as the bridge direction, with the mounting hole between them, and a pair of hanging portions that are bent downward from the pair of mounting portions and that are continuous with the other end of the pair of opposing wall portions in a direction perpendicular to the bridge direction as seen in the penetrating direction of the mounting hole, and that extend in directions away from the other end of the pair.

[0007] According to the above configuration, the spring is suspended across the frame main body, with its end passing through a mounting hole in the panel member. The vibration-damping member is attached to the panel member by being fitted into the mounting hole, with the end of the spring inserted and fixed into an insertion hole formed in the vibration-damping member. The vibration-damping member protrudes from both sides of the panel member and damps the elastic displacement of the spring by elastically deforming. By providing the vibration-damping member at the mounting portion of the end of the spring, it is possible to improve vibration damping performance and prevent or suppress abnormal noise between the spring and the panel member.

[0009] Also, According to the above-mentioned configuration, the support wall of the support member fixed to the panel member contacts the outer periphery of the vibration damping member around the portion of the end of the spring that passes through the mounting hole, so that the outer periphery of the vibration damping member is also supported by the support wall of the support member, making it possible to further damp the elastic displacement of the spring.

[0011] Also, According to the above configuration, The frame main body constitutes the framework of the seat cushion, and the panel member has a mounting hole formed through the portion with an upper surface facing upward of the seat, and the end of the spring is bent downward of the seat. The end of the spring can be attached relatively easily, and the elastic displacement of the spring of the seat cushion can be effectively damped by the vibration damping member.

[0013] Also,According to the above configuration, the pair of opposing wall portions of the support wall portion face each other in the direction along the spring bridge direction, so that when the end of the spring fixed to the vibration damping member attempts to displace in the direction along the spring bridge direction, the pair of opposing wall portions can effectively support the vibration damping member, thereby making it possible to further attenuate the elastic displacement of the spring.

[0015] Also, According to the above configuration, the connecting wall portion of the support wall portion has a direction perpendicular to the opposing direction of the pair of opposing wall portions when viewed in the penetrating direction of the mounting hole. On the other hand Since the ends are connected in the opposing direction, deformation of the pair of opposing walls can be effectively suppressed when the pair of opposing walls receives a load from the ends of the spring via the vibration damping member. According to the above configuration, the pair of opposing wall portions are flat in a plan view along a direction perpendicular to the spring bridge direction. The support wall portion is bent into a generally U-shape so that the other side in a direction perpendicular to the opposing direction of the pair of opposing wall portions is open when viewed in the direction through the mounting hole. Furthermore, the pair of mounting portions of the support member are fixed to the underside of the panel member on both sides of the mounting hole in the same direction as the opposing direction, and a pair of hanging portions bent downward from the pair of mounting portions are continuous with the other ends of the pair of opposing wall portions in the direction perpendicular to the opposing direction when viewed in the direction through the mounting hole, and extend in directions away from each other.

[0016] Claim 2 The seat frame of the present invention described in claim Article 1 In the above configuration, the vibration damping member includes an interposition portion disposed on the upper surface side of the panel member between a portion of the outer periphery of the mounting hole and a portion of the spring.

[0017] According to the above configuration, the intervening portion of the vibration damping member is positioned on the upper surface side of the panel member between part of the outer periphery of the mounting hole and part of the spring, thereby more effectively suppressing the generation of abnormal noise caused by contact between the spring and the upper surface of the panel member.

[0018] Claim 3 The vehicle seat of the present invention described in claim 1 includes a seat pad as a cushioning material and a support member for supporting the seat pad from its back side. or Claim 2 to and the seat frame described above.

[0019] According to the above configuration, the seat pad is supported from its rear side by the seat frame. or Claim 2 toAs described above, the above-described functions and effects are obtained, and as a result, in the vehicle seat of the present invention, vibrations transmitted from the seat pad to the seated occupant are suppressed. [Effects of the Invention]

[0020] As described above, the seat frame and vehicle seat of the present invention have the excellent effect of being able to improve vibration damping performance and prevent or suppress the generation of abnormal noise. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing a vehicle seat according to an embodiment of the present invention; [Figure 2] 2 is a perspective view showing a seat cushion frame applied to the vehicle seat of FIG. 1 in an enlarged and simplified state. FIG. [Figure 3] 3 is an enlarged cross-sectional view showing a cross section taken along line 3-3 in FIG. 2. FIG. [Figure 4] FIG. 4 is a perspective view showing the support bracket shown in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0022] 1 to 4, a seat cushion frame 20 as a seat frame according to one embodiment of the present invention and a vehicle seat 10 including the seat cushion frame 20 will be described. Note that arrows FR, UP, and LH shown as appropriate in each drawing indicate the front, upper, and left directions of the vehicle seat 10, respectively. When the following description uses front-rear, up-down, left-right directions, these directions will be those based on the vehicle seat 10, unless otherwise specified.

[0023] (Configuration of the embodiment) 1 is a perspective view of a vehicle seat 10 according to this embodiment. The vehicle seat 10 includes a seat cushion 12 that forms 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.

[0024] The seat cushion 12 includes a seat cushion pad 12P as a seat pad that is a cushioning material, and a seat cushion frame 20 (see FIG. 2) that serves as a seat frame that supports the seat cushion pad 12P from its back side (in other words, from the underside of the seat). The seat cushion pad 12P is made of a foam such as urethane foam, and the surface of the seat cushion pad 12P is covered with a seat cushion skin 12E. Note that in FIG. 1, to make it easier to understand the configuration of the seat cushion 12, a portion of the seat cushion skin 12E is cut away to show the seat cushion pad 12P.

[0025] The seat back 14 includes a seat back pad 14P, which is a cushioning material, and a seat back frame (not shown) that supports the seat back pad 14P from its rear side (i.e., from the rear side of the seat). The seat back pad 14P is made of a foam such as urethane foam, and the surface of the seat back pad 14P is covered with a seat back skin 14E. In FIG. 1, to facilitate understanding of the configuration of the seat back 14, a portion of the seat back skin 14E is cut away to show the seat back pad 14P. The basic internal configuration of the seat back 14 is publicly known, for example, from Japanese Patent Application Laid-Open No. 2016-16817, and therefore detailed description thereof will be omitted.

[0026] FIG. 2 shows an enlarged and simplified perspective view of the seat cushion frame 20. The seat cushion frame 20 has a frame main body 22 that forms the skeleton of the seat cushion. The frame main body 22 includes a pair of left and right side frames 24 that form both sides of the seat cushion 12 in the seat width direction (seat left-right direction) and are arranged with the seat front-rear direction as their longitudinal direction. Front end portions of the pair of left and right side frames 24 are connected to each other in the seat width direction by a front frame 26 that serves as a panel member. Furthermore, rear end portions of the pair of left and right side frames 24 are connected to each other in the seat width direction by a pipe-shaped rear frame 28. The front frame 26 and the rear frame 28 each form part of the frame main body 22.

[0027] The front frame 26 includes an upper plate portion 26A having an upper surface 26A1 facing upward from the seat. The upper plate portion 26A extends in the seat width direction, with both end portions in the seat width direction extending toward the rear of the seat. The front frame 26 also includes a front plate portion 26F bent downward from the front end of the upper plate portion 26A and hanging down, side plate portions 26S bent downward from both end portions of the upper plate portion 26A in the seat width direction, and a rear plate portion 26R (see FIG. 3) bent downward from the rear end of a middle portion of the upper plate portion 26A in the seat width direction and hanging down. The front plate portion 26F and the side plate portion 26S are formed continuously, and the rear end portions of the side plate portions 26S are joined to the side frames 24.

[0028] As shown in the partially enlarged view of Figure 2, a mounting hole 26H is formed through the rear portion of the upper plate portion 26A of the front frame 26. A plurality of mounting holes 26H (three in this embodiment, for example) are formed so as to be aligned at predetermined intervals in the seat width direction. The mounting holes 26H are elements that can also be understood as locking holes. The detailed configuration of the surrounding area of ​​the mounting holes 26H will be described later.

[0029] 2, a plurality of (three in this embodiment, for example) metal springs, namely, seat cushion springs 30, are suspended between the front frame 26 and the rear frame 28 of the frame main body 22. In the drawing, the suspension direction of the plurality of seat cushion springs 30 is indicated by the symbol 30X.

[0030] The seat cushion springs 30 are arranged in parallel at predetermined intervals in the seat width direction. The seat cushion springs 30 are also arranged along the underside of the seat cushion pad 12P (see FIG. 1). The seat cushion springs 30 have a wave-shaped portion 30A that is alternately bent into a U-shape in plan view that opens to one side in the horizontal direction perpendicular to the bridge direction (see the direction of arrow 30X) and a U-shape in the opposite direction, and are sometimes referred to as S-springs.

[0031] The rear end 30R of the seat cushion spring 30 is formed in a generally inverted U-shape in a side view of the seat and is fixed to the rear frame 28. Fig. 3 shows an enlarged cross-sectional view of a section taken along line 3-3 in Fig. 2. As shown in the partially enlarged view of Fig. 2 and Fig. 3, a front end 30F, which serves as the front end of the seat cushion spring 30, is bent downward toward the seat. The front end 30F of the seat cushion spring 30 passes through the mounting hole 26H.

[0032] As shown in FIG. 3 , a vibration damping member 32 is fitted into the mounting hole 26H, and in this state, the vibration damping member 32 is attached to the upper plate portion 26A of the front frame 26. The vibration damping member 32 is made of rubber and is formed into a generally cylindrical shape. It protrudes from both the upper and lower surfaces (i.e., the upper surface 26A1 side and the lower surface 26A2 side) of the front frame 26. An insertion hole 32H of a constant diameter is formed through the axial center of the vibration damping member 32, and the front end portion 30F of the seat cushion spring 30 is inserted into and fixed in this insertion hole 32H. For example, the tip end (lower portion) of the front end portion 30F of the seat cushion spring 30 penetrates below the vibration damping member 32. The vibration damping member 32 elastically deforms to damp the elastic displacement of the seat cushion spring 30. In other words, in this embodiment, a damping structure is provided at the fastening point of the front end portion 30F of the seat cushion spring 30.

[0033] As one example, the vibration damping member 32 has a first component 32A, which is the portion from the portion located inside the mounting hole 26H to a portion below that, having a constant diameter, and a second component 32B, which is the portion above the first component 32A, having a larger diameter than the first component 32A. The second component 32B of the vibration damping member 32 has an intervening portion 32X that is located on the upper surface 26A1 side of the upper plate portion 26A of the front frame 26, between part of the outer periphery of the mounting hole 26H and part of the seat cushion spring 30.

[0034] A support bracket 34 serving as a support member is fixed to the underside 26A2 of the upper plate 26A of the front frame 26 and on the outer periphery of the mounting hole 26H. Fig. 4 shows a perspective view of the support bracket 34. Note that in Fig. 4, a portion of the upper plate 26A is shown by a two-dot chain line to make it easier to understand an example of the positional relationship between the support bracket 34 and the upper plate 26A when the support bracket 34 shown in Fig. 3 is fixed to the upper plate 26A.

[0035] 4, the support bracket 34 is made of a curved plate material. The support bracket 34 has mounting portions 34A that are fixed to the lower surface 26A2 of the upper plate portion 26A of the front frame 26. The mounting portions 34A are flat plates, provided in a pair at the front and rear, and fixed to both sides of the mounting hole 26H in the seat front-rear direction on the lower surface 26A2 of the upper plate portion 26A.

[0036] Support bracket 34 includes a pair of hanging portions 34B that are bent downward from the ends of the pair of mounting portions 34A in the seat width direction (for example, the ends on the left side of the seat) and aligned in the seat front-to-rear direction. The pair of hanging portions 34B are flat. The ends of the pair of hanging portions 34B that are closest to each other are connected by a support wall portion 34C that is bent into a substantially U-shape so that one side in the seat width direction (for example, the left side of the seat) is open, as viewed in the direction in which mounting hole 26H penetrates.

[0037] As shown in FIG. 3, the support wall portion 34C includes a pair of opposing wall portions 34X that face each other in the direction along the seat cushion spring 30's bridge direction (see the direction of arrow 30X), and a connecting wall portion 34Y that connects the ends of the pair of opposing wall portions 34X shown in FIG. 4 that are perpendicular to the opposing direction X, as viewed in the direction through the mounting hole 26H. The pair of opposing wall portions 34X and the connecting wall portion 34Y are flat. A small notch 34D is formed at the upper end of the boundary between the opposing wall portions 34X and the hanging portion 34B. As shown in FIG. 3, the support wall portion 34C is disposed around a portion of the front end 30F of the seat cushion spring 30 that passes through the mounting hole 26H, so as to contact the outer periphery of the vibration damping member 32. The lower end of the support wall portion 34C is, for example, located slightly above the lower end of the vibration damping member 32.

[0038] (Actions and Effects of the Embodiments) Next, the operation and effects of this embodiment will be described.

[0039] A load from an occupant (not shown) seated in a vehicle seat 10 shown in Fig. 1 is transmitted to a seat cushion spring 30 shown in Fig. 2 via a seat cushion pad 12P, etc. When a vehicle (not shown) equipped with the vehicle seat 10 (see Fig. 1) is traveling, the load from the seated occupant is transmitted to the seat cushion spring 30, causing the central region of the seat cushion spring 30 to swing up and down, and a load acts on a front end portion 30F of the seat cushion spring 30 shown in Fig. 3 in the direction of arrow A.

[0040] In this embodiment, a vibration-damping member 32 is fitted into the mounting hole 26H for mounting the front end 30F of the seat cushion spring 30, and the front end 30F of the seat cushion spring 30 is inserted and fixed into the insertion hole 32H formed in the vibration-damping member 32. The vibration-damping member 32 protrudes from both the upper surface 26A1 and the lower surface 26A2 of the upper plate portion 26A of the front frame 26. When the front end 30F of the seat cushion spring 30 moves in the direction of arrow A, the vibration-damping member 32 elastically deforms, thereby damping the elastic displacement of the seat cushion spring 30. In this way, providing the vibration-damping member 32 at the mounting portion of the front end 30F of the seat cushion spring 30 improves vibration damping performance and prevents or suppresses abnormal noise between the seat cushion spring 30 and the front frame 26.

[0041] In this embodiment, the front frame 26 has an upper plate portion 26A having an upper surface 26A1, and the front end portion 30F of the seat cushion spring 30 is bent downward toward the seat. This makes it relatively easy to attach the front end portion 30F of the seat cushion spring 30.

[0042] Furthermore, in this embodiment, the support wall portion 34C of the support bracket 34 fixed to the front frame 26 contacts the outer periphery of the vibration damping member 32 around the portion of the front end portion 30F of the seat cushion spring 30 that passes through the mounting hole 26H. This allows the outer periphery of the vibration damping member 32 to be supported also by the support wall portion 34C of the support bracket 34, thereby further damping the elastic displacement of the seat cushion spring 42.

[0043] In this embodiment, the pair of opposing wall portions 34X of the support wall portion 34C face each other in the direction along the bridge direction (see the direction of arrow 30X) of the seat cushion spring 30. Therefore, when the front end portion 30F of the seat cushion spring 30 fixed to the vibration damping member 32 attempts to displace in the direction along the bridge direction (see the direction of arrow 30X) of the seat cushion spring 30, the pair of opposing wall portions 34X can effectively support the vibration damping member 32. This makes it possible to further damp the elastic displacement of the seat cushion spring 42.

[0044] 4 connects the ends of the pair of opposing wall portions 34X that are perpendicular to the opposing direction X, in the opposing direction X, when viewed in the penetrating direction of the mounting hole 26H. Therefore, when the pair of opposing wall portions 34X shown in FIG. 3 receives a load from the front end portion 30F of the seat cushion spring 30 via the vibration damping member 32, deformation of the pair of opposing wall portions 34X can be effectively suppressed.

[0045] In addition, in this embodiment, the intervening portion 32X of the vibration damping member 32 is positioned on the upper surface 26A1 side of the upper plate portion 26A of the front frame 26 between a part of the outer periphery of the mounting hole 26H and a part of the seat cushion spring 30, thereby more effectively suppressing the generation of abnormal noise due to contact between the seat cushion spring 30 and the upper surface 26A1 of the upper plate portion 26A of the front frame 26.

[0046] In the vehicle seat 10 of this embodiment shown in Fig. 1, the seat cushion pad 12P is supported from its back surface by the seat cushion frame 20 shown in Fig. 2. The seat cushion frame 20 provides the above-described functions and effects, and as a result, in the vehicle seat 10 shown in Fig. 1, vibrations transmitted from the seat cushion pad 12P to the seated occupant are suppressed.

[0047] As described above, according to this embodiment, it is possible to improve the vibration damping performance and prevent or suppress the generation of abnormal noise.

[0049] In addition, In the above embodiment, the vibration damping member 32 is made of rubber, but as a modification of the above embodiment, the vibration damping member may be made of a resin material that is elastically deformable.

[0050] In the above embodiment, the support bracket 34 is provided as a support member, and such a configuration is preferable. Reference Example Not an Embodiment of the Invention Alternatively, a configuration in which the support bracket (34) is not provided may be adopted.

[0051] In the above embodiment, the support member is the support bracket 34. As a reference example that is not an embodiment of the present invention, The support member may include, for example, a cylindrical portion that contacts the outer periphery of the vibration damping member (32) around the entire circumference, and an attachment portion that extends radially outward from one axial end of the cylindrical portion and is fixed to the underside (26A2) of the panel member (front frame 26) and the outer periphery of the attachment hole (26H).

[0052] In the above embodiment, the support wall portion 34C of the support bracket 34 serving as a support member has a pair of opposing wall portions 34X. Reference Example Not an Embodiment of the Invention Alternatively, the support member may not have a pair of opposing wall portions (34X), but may have, for example, three or more support wall portions formed intermittently along the outer periphery of the vibration damping member (32).

[0053] In the above embodiment, the support wall portion 34C of the support bracket 34 serving as a support member has the connecting wall portion 34Y in addition to the pair of opposing wall portions 34X. This configuration is preferable, but Reference Example Not an Embodiment of the Invention Alternatively, the support wall of the support member may have a pair of opposing walls (34X) and no connecting wall (34Y).

[0054] Furthermore, in the above embodiment, the vibration damping member 32 is provided with an interposed portion 32X, and such a configuration is preferable, but as a modification of the above embodiment, a configuration in which the vibration damping member does not have an interposed portion (32X) can also be adopted.

[0055] The above-described embodiment and the above-described modifications can be implemented in appropriate combinations.

[0056] Although 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 within the scope of the gist of the present invention. [Explanation of symbols]

[0057] 10 Vehicle seats 12 seat cushions 12P seat cushion pad (seat pad) 20 Seat cushion frame (seat frame) 22 Frame body 26 Front frame (panel member) 26A Upper plate portion (portion with upper surface facing upward of the seat) 26A1 Top 26H mounting hole 30 Seat cushion spring (spring) 30X Seat cushion spring installation direction (spring installation direction) 30F Front end (end) 32 Vibration damping member 32H insertion hole 32X Interposition 34 Support bracket (support member) 34A Mounting part 34B Drooping part 34C Support wall section 34X Opposite wall 34Y connecting wall X: the opposing direction of a pair of opposing walls

Claims

1. a frame main body portion that forms a framework of a seat cushion of a vehicle seat and includes a panel member having an upper surface facing upward of the seat and having a mounting hole formed therethrough; a spring that is spanned across the frame main body, has an end bent downward toward the seat, and passes through the mounting hole; a vibration damping member that is attached to the panel member by being fitted into the mounting hole, protruding from both sides of the panel member, having insertion holes into which ends of the springs are inserted and fixed, and that damps elastic displacement of the springs by elastic deformation; a support member fixed to the panel member and including a support wall portion that contacts an outer circumferential side of the vibration damping member around a portion of the end of the spring that passes through the mounting hole; and the support wall portion has a pair of opposing wall portions that face each other in a direction along the bridge direction of the spring and that are flat in a direction perpendicular to the bridge direction of the spring in a plan view, and a connecting wall portion that connects one end of the pair of opposing wall portions in a direction perpendicular to the bridge direction as seen in the penetrating direction of the mounting hole, and is bent in a substantially U-shape so that the other side in the direction perpendicular to the bridge direction of the pair of opposing wall portions as seen in the penetrating direction of the mounting hole is open, Furthermore, the support member includes a pair of mounting portions fixed to the underside of the panel member on both sides in the same direction as the opposing direction, with the mounting hole between them, and a pair of hanging portions bent downward from the pair of mounting portions and extending in directions away from each other, continuous with other ends of the pair of opposing wall portions in a direction perpendicular to the opposing direction as viewed in the penetrating direction of the mounting hole.

2. The seat frame according to claim 1 , wherein the vibration damping member includes an interposition portion disposed on the upper surface side of the panel member between a portion of the outer periphery of the mounting hole and a portion of the spring.

3. A seat pad, which is a cushioning material, the seat frame according to claim 1 or 2, which supports the seat pad from a rear surface side thereof; A vehicle seat comprising:

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