Cushion frame

Abstract

To disclose one example of a cushion frame of which deformation can be suppressed.SOLUTION: A first bead part 15 and a second bead part 16 are provided on a first side frame 11 and a second side frame 12, respectively. The first bead part 15 is a recess in which a virtual ridge line L1 continuing an apex of the first bead part 15 is substantially coincident with a virtual line Lo from a first connection member 13 to a stationery part 11A. The second bead part 16 is provided below the first bead part 15. An angle θ formed by a virtual ridge line L2 continuing an apex of the second bead part 16 and the virtual ridge line L1 is not more than a predetermined angle of 0 degree or more.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a cushion frame that forms the skeleton of a seat cushion. [Background technology]

[0002] For example, the side frame described in Patent Document 1 is provided with an energy absorbing portion configured as a recess recessed in the seat width direction. When a large load acts on the side frame, the energy absorbing portion deforms in a concentrated manner, thereby absorbing the energy of the load. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-132917 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in a cushion frame having two side frames 11, 12 and a connecting pipe 13 as shown in Figure 1, if a large downward load is input to the connecting pipe 13, the general surfaces of the two side frames 11, 12 may be deformed so as to bulge in the seat width direction.

[0005] The present disclosure discloses an example of a cushion frame that can suppress the above-described deformation. [Means for solving the problem]

[0006] A cushion frame that is applied to a seat cushion of a vehicle seat and that constitutes the framework of the seat cushion desirably has at least one of the following constituent features, for example.

[0007] That is, the constituent elements are a first side frame (11) arranged at one end of the seat width direction and extending in the seat front-rear direction, the first side frame (11) having a fixing portion (11A) at its rear end that is fixed directly or indirectly to the vehicle; a second side frame (12) arranged at the other end of the seat width direction and extending in the seat front-rear direction, the second side frame (12) having a fixing portion (11A) at its rear end that is fixed directly or indirectly to the vehicle; a connecting member (13) extending in the seat width direction, the connecting member (13) connecting the rear end side of the first side frame (11) and the rear end side of the second side frame (12); and a first bead portion (15) and a second bead portion (16) provided at least at the rear end side of the first side frame (11), which are curved so that a portion of the first side frame (11) bulges or recesses in the seat width direction.

[0008] It is desirable that the imaginary ridge line (L1) connecting the tops of the first bead portion (15) approximately coincides with the imaginary line extending from the connecting member (13) to the fixed portion (11A), that the second bead portion (16) is located below the first bead portion (15), and that the angle formed between the imaginary ridge line (L2) connecting the tops of the second bead portion (16) and the ridge line (L1) of the first bead portion (15) is equal to or less than a predetermined angle.

[0009] As a result, even if a large downward load acts on the connecting member 13, the first bead portion 15 and the second bead portion 16 prevent the first side frame 11 from deforming in a manner that causes it to bulge in the seat width direction. As a result, the thickness dimension of the members constituting the first side frame 11 can be reduced, which can make the first side frame 11 lighter.

[0010] The cushion frame may have the following configuration, for example. That is, it is desirable that a step-shaped weakened portion (17) be provided between the connecting member (13) and the first bead portion (15) of the first side frame (11).

[0011] As a result, when a large downward load acts on the connecting member (13), the weak portion (17) undergoes plastic deformation so as to buckle, and the displacement of the connecting member (13) can be guided along the ridge line (L1) of the first bead portion (15).

[0012] Furthermore, even if a large downward load acts on the connecting member (13) and the connecting member (13) is significantly displaced, it is possible to prevent the connecting member (13) from interfering with other members other than the first side frame (11).

[0013] Furthermore, when the dimension of the portion of the first bead portion (15) that is parallel to the ridge line (L1) of the first bead portion (15) and the direction perpendicular to the seat width direction is defined as the bead width (W), it is desirable that the bead width (W) of the first bead portion (15) becomes smaller as it approaches the fixed portion (11A).

[0014] Incidentally, the symbols in each of the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a view showing a cushion frame according to the first embodiment. [Figure 2] FIG. 2 is a view showing a cushion frame according to the first embodiment. [Figure 3] FIG. 3 is a view showing the rear end side of a first side frame according to the first embodiment. [Figure 4] FIG. 3 is a view showing the rear end side of a first side frame according to the first embodiment. [Figure 5] 1A and 1B are explanatory views of the shape of a first bead portion. [Figure 6] 1A and 1B are explanatory views of the shape of a first bead portion. [Figure 7] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following "embodiments of the invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

[0017] This embodiment is an example in which the cushion frame according to the present disclosure is applied to a seat (hereinafter referred to as a vehicle seat) to be installed in a vehicle such as a car. Arrows and diagonal lines indicating directions in each figure are provided to facilitate understanding of the relationships between the figures and the shapes of components or parts.

[0018] Therefore, the cushion frame is not limited to the directions indicated in the drawings. The directions indicated in the drawings are directions when the vehicle seat according to the present embodiment is assembled to a vehicle. Diagonally shaded drawings do not necessarily represent cross-sectional views.

[0019] At least one of a component or part that is described with a reference numeral is provided unless otherwise specified, such as "one." In other words, unless otherwise specified, two or more components may be provided. The cushion frame shown in the present disclosure includes at least one of the components, such as the component or part, that are described with a reference numeral and the structural parts shown in the drawings.

[0020] (First embodiment) <1. Overview of cushion frame> 1 is applied to a vehicle seat 1. The vehicle seat 1 includes at least a seat cushion 3 and a seat back (not shown).

[0021] The seat cushion 3 is a portion for supporting the buttocks of a seated person. The seat back is a portion for supporting the back of a seated person. The cushion frame 10 is a strength member that constitutes the framework of the seat cushion 3.

[0022] <1.1. Overview of cushion frame structure> As shown in FIG. 1, the cushion frame 10 includes at least a first side frame 11, a second side frame 12, a first connecting member 13, a second connecting member 14, and the like.

[0023] <First side frame> 2, the first side frame 11 is a member that is disposed at one end side in the seat width direction (the left end side in this embodiment) and extends in the seat front-rear direction. Fixing portions 11A and 11B are provided at the lower end of the first side frame 11.

[0024] The fixing portion 11A is provided on the rear end side of the first side frame 11 and is fixed directly or indirectly to the vehicle. The fixing portion 11B is provided on the front end side of the first side frame 11 and is fixed directly or indirectly to the vehicle.

[0025] The first side frame 11, i.e., the cushion frame 10, according to this embodiment is indirectly fixed to the vehicle via a slide device (not shown). The slide device can fix the cushion frame 10 to the vehicle in a state where it can slide in the fore-and-aft direction of the vehicle, or in a state where it cannot slide.

[0026] Each of the fixing portions 11A and 11B according to this embodiment is configured with at least one bolt insertion hole, which is a through hole into which a fastening bolt (not shown) is inserted.

[0027] The fixing portion 11A according to this embodiment is configured with two bolt insertion holes. Unless otherwise specified, hereinafter, the fixing portion 11A refers to the rear one of the two bolt insertion holes.

[0028] <Second side frame> 1, the second side frame 12 is a member that is disposed on the other end side in the seat width direction (the right end side in this embodiment) and extends in the seat front-rear direction. Fixing portions 12A and 12B are provided on the lower end of the second side frame 12.

[0029] The fixing portion 12A is provided on the rear end side of the second side frame 12 and is fixed directly or indirectly to the vehicle. The fixing portion 12B is provided on the front end side of the second side frame 12 and is fixed directly or indirectly to the vehicle.

[0030] Like the first side frame 11, the second side frame 12 is indirectly fixed to the vehicle via a slide device. Each of the fixing portions 12A, 12B according to this embodiment is configured with at least one bolt insertion hole. The bolt insertion hole is a through hole into which a fastening bolt (not shown) is inserted.

[0031] In this embodiment, the first side frame 11 and the second side frame 12 are shaped to be substantially symmetrical with respect to the center in the width direction. That is, the first side frame 11 and the second side frame 12 are configured to be substantially symmetrical with respect to a virtual vertical plane passing through the center in the width direction.

[0032] The first side frame 11 and the second side frame 12 are each integrally formed together with the first bead portion 15 and the second bead portion 16, which will be described later, by performing plastic processing (e.g., press processing) on ​​a metal plate such as a cold-formed steel plate.

[0033] <First connecting member and second connecting member> The first connecting member 13 and the second connecting member 14 are members that extend in the seat width direction. Note that the first connecting member 13 and the second connecting member 14 according to this embodiment are configured of cylindrical hollow members (for example, round pipes).

[0034] The first connecting member 13 connects the rear end side of the first side frame 11 to the rear end side of the second side frame 12. The second connecting member 14 connects the front end side of the first side frame 11 to the front end side of the second side frame 12.

[0035] The first connecting member 13 is fixed to each of the side frames 11, 12 by welding via a bracket 13A. The second connecting member 14 is fixed to each of the side frames 11, 12 directly by welding.

[0036] <1.2 Characteristic structure of the side frame> As described above, the first side frame 11 and the second side frame 12 are symmetrical in shape. The following description will be given of the characteristic configuration of the first side frame 11 as an example.

[0037] 3, a first bead portion 15, a second bead portion 16, and a fragile portion 17 are provided on the rear end side of the first side frame 11. The first bead portion 15 and the second bead portion 16 are portions where a part of the steel plate that constitutes the first side frame 11 is curved so as to bulge or recess in the seat width direction.

[0038] The first bead portion 15 and the second bead portion 16 according to this embodiment are portions curved so as to be recessed toward the second side frame 12 with respect to the general surface 11C of the first side frame 11. The general surface 11C is a surface perpendicular to the seat width direction, and is a portion where the amount of plastic flow of the material during plastic processing is relatively small.

[0039] <Details of the first bead> As shown in Figure 4, the first bead portion 15 is a recess in which an imaginary ridge line L1 connecting the tops 15A (see Figure 5A, etc.) of the first bead portion 15 approximately coincides with an imaginary line Lo extending from the first connecting member 13 to the fixed portion 11A.

[0040] It should be noted that the imaginary line Lo shown in FIG. 4 is an imaginary line that extends from the central axis of the first connecting member 13 through the center of the bolt insertion hole that forms the fixing portion 11A (see FIG. 3). 5A, 5B, 6A, and 6B, the first bead portion 15 according to this embodiment has a dimensional difference between the general surface 11C and the apex 15A, i.e., a recess dimension d, which varies along the ridge line L1. Note that the recess dimension d is a dimension parallel to the sheet width direction.

[0041] The bead width W of the first bead portion 15 becomes smaller as it approaches the fixed portion 11A, i.e., the lower end side. Therefore, the outer edge shape of the first bead portion 15 projected onto an imaginary plane perpendicular to the seat width direction is a substantially triangular shape with a convex lower side (see FIG. 4).

[0042] The phrase "the imaginary ridge line L1 is substantially coincident with the imaginary line Lo" means that the ridge line L1 and the imaginary line Lo are substantially parallel to each other, and the ridge line L1 and the imaginary line Lo are substantially coincident with each other. of This refers to a state in which the deviation dimension is, for example, half or less of the outer diameter dimension of the first connecting member 13.

[0043] The phrase "the ridge line L1 and the imaginary line Lo are substantially parallel to each other" means that the angle between the ridge line L1 and the imaginary line Lo is, for example, 15 degrees or less and 0 degrees or more. The bead width W refers to the dimension of the portion of the first bead portion 15 that is parallel to the ridge line L1 of the first bead portion 15 and to a direction perpendicular to the seat width direction.

[0044] <Details of the second bead> 4, the second bead portion 16 is provided below the first bead portion 15. An angle θ formed between an imaginary ridge line L2 connecting the tops of the second bead portion 16 and the ridge line L1 is equal to or greater than 0 degrees and is equal to or smaller than a predetermined angle (for example, 30 degrees).

[0045] In this embodiment, the first bead portion 15 and the second bead portion 16 are configured so that the extension line of the ridge line L1 and the extension line of the ridge line L2 intersect within the fixing portion 11A or within a predetermined range including the fixing portion 11A.

[0046] In other words, the extension of ridge line L1 and the extension of ridge line L2 intersect within the fixed portion 11A or a predetermined range including the fixed portion 11A, and the angle θ between ridge line L1 and ridge line L2 is less than or equal to a "predetermined angle including 0 degrees."

[0047] <Details of the vulnerable part> 7, the fragile portion 17 is a stepped portion of the first side frame 11 provided between the first connecting member 13 and the first bead portion 15. The fragile portion 17 is more susceptible to buckling deformation than other portions when subjected to a compressive load parallel to the imaginary line Lo.

[0048] That is, the cross-sectional shape of the fragile portion 17 according to this embodiment is configured to be bent in a substantially Z-shape. Therefore, when a compressive load that crushes the Z-shaped cross-sectional shape is applied, the bent portions 17A and 17B that form the Z shape are significantly deformed, and the fragile portion 17 is plastically deformed so as to buckle.

[0049] <2. Features of the cushion frame (particularly the side frame) according to this embodiment> The first side frame 11 and the second side frame 12 according to this embodiment are provided with a first bead portion 15 and a second bead portion 16, respectively. This increases the second moment of area in the first bead portion 15 and the second bead portion 16.

[0050] Therefore, even when a large downward load acts on the first connecting member 13, the first side frame 11 and the second side frame 12 are prevented from being deformed so as to bulge in the seat width direction.

[0051] Furthermore, since the thickness dimensions of the steel plates constituting the first side frame 11 and the second side frame 12 can be reduced, it is possible to reduce the weight of the first side frame 11 and the second frame 22, i.e., the cushion frame 10.

[0052] In addition, a step-shaped bent weak portion 17 is provided between the first connecting member 13 and the first bead portion 15 of the first side frame 11, and between the first connecting member 13 and the first bead portion 15 of the second side frame 12.

[0053] As a result, when a large downward load acts on the first connecting member 13, each weak portion 17 undergoes plastic deformation so as to buckle, and the displacement of the first connecting member 13 can be guided along the ridge line L1 of each first bead portion 15.

[0054] Furthermore, even if a large downward load acts on the first connecting member 13, causing the first connecting member 13 to be significantly displaced, it is possible to prevent the first connecting member 13 from interfering with other members other than the first side frame 11 and the second side frame 12.

[0055] (Other embodiments) In the above-described embodiment, the imaginary line Lo is an imaginary line that runs from the central axis of the first connecting member 13 through the center of the bolt insertion hole that forms the fixed portion 11A. However, the present disclosure is not limited to this. That is, the imaginary line Lo according to this disclosure is sufficient as long as it runs from the first connecting member 13 to the fixed portion 11A.

[0056] In the above-described embodiment, the fragile portion 17 is provided between the first connecting member 13 and the first bead portion 15. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the fragile portion 17 is eliminated, for example.

[0057] In the above-described embodiment, the outer edge shape of the first bead portion 15 is a generally triangular shape with a convex bottom. However, the present disclosure is not limited to this. That is, the present disclosure may also be applicable to a first bead portion 15 having an oval outer edge shape whose major axis direction coincides with the imaginary line L1, for example.

[0058] The first bead portion 15 and the second bead portion 16 according to the above-described embodiment have a recessed shape that bulges out toward the center in the seat width direction, but the present disclosure is not limited to this. That is, the disclosure may be, for example, a configuration having a first bead portion 15 and a second bead portion 16 that bulge in the opposite direction to the above-described embodiment, or a configuration in which the bulging direction of the first bead portion 15 and the bulging direction of the second bead portion 16 are different.

[0059] In the above-described embodiment, the first side frame 11 and the second side frame 12 are provided with the first bead portion 15 and the second bead portion 16, respectively. However, the present disclosure is not limited to this.

[0060] That is, the disclosure may be, for example, a configuration in which the first bead portion 15 and the second bead portion 16 are provided on only one of the first side frame 11 and the second side frame 12.

[0061] In the above-described embodiment, the vehicle seat according to the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited thereto. That is, the present disclosure can also be applied to seats used in vehicles such as railway cars, ships, and aircraft, as well as stationary seats used in theaters, homes, etc.

[0062] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0063] 10...Cushion frame 11...First side frame 11A, 11B…Fixed part 12...Second side frame 12A, 12B…Fixed part 13...First connecting member 14...Second connecting member 15...First bead section 16...Second bead section 17...Weak part

Claims

1. A cushion frame that is applied to a seat cushion of a vehicle seat and that constitutes a skeleton of the seat cushion, a first side frame disposed at one end of the seat width direction and extending in a front-rear direction of the seat, the first side frame having a fixing portion at a rear end thereof that is fixed directly or indirectly to a vehicle; a second side frame disposed on the other end side of the seat in the width direction and extending in the front-rear direction of the seat, the second side frame having a fixing portion at a rear end side thereof that is fixed directly or indirectly to the vehicle; a connecting member extending in the seat width direction and connecting a rear end side of the first side frame and a rear end side of the second side frame; a first bead portion and a second bead portion provided at least on a rear end side of the first side frame, the first side frame being curved so as to bulge or recess in a seat width direction; a virtual ridge line connecting the tops of the first bead portion and a virtual line extending from the connecting member to the fixed portion are parallel to each other, and the deviation between the ridge line and the virtual line is equal to or less than half the outer diameter of the connecting member, Furthermore, the second bead portion is located below the first bead portion, and the angle between an imaginary ridge line connecting the tops of the second bead portion and the ridge line of the first bead portion is less than 15 degrees and greater than 0 degrees.

2. The cushion frame according to claim 1 , wherein the first side frame has a weakened portion bent in a stepped shape between the connecting member and the first bead portion.

3. When the dimension of a portion of the first bead portion that is parallel to the ridge line and a direction perpendicular to the seat width direction of the first bead portion is defined as a bead width, The cushion frame according to claim 1 or 2, wherein the bead width of the first bead portion decreases as it approaches the fixing portion.

4. a first bead portion and a second bead portion provided on a rear end side of the second side frame, the first bead portion and the second bead portion being curved so that a portion of the second side frame bulges or is recessed in the seat width direction; The cushion frame according to claim 3, wherein the first bead portion and the second bead portion provided on the second side frame are shaped symmetrically to the first bead portion and the second bead portion provided on the first side frame with respect to the center in the width direction.

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