Vehicle seat

Abstract

To provide a vehicle seat positively and plastically deforming a specific portion set on a recliner plate when a large load containing a downward component acts on the recliner plate.SOLUTION: A dimension W1 in a seat longitudinal direction of a step part 94 is smaller than a dimension W2 in a seat longitudinal direction of a third portion 93, and thereby a cross sectional area of the step part 94 is smaller than a cross sectional area of the third portion 93, and a flexural rigidity of a third portion 93 and a range from the third portion 93 to the first portion 91 of a recliner plate 9 is larger than the flexural rigidity of the step part 94. As a result of this, in the vehicle seat, the step part 94 is plastically deformed preferably because stress is likely to concentrate on the step part 94 when the large load including downward components act on the recliner plate 9. Accordingly, the load acting on the recliner in a collision can be reliably reduced in combination with effect of an impact absorption hole 9B.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle seat to be installed in a vehicle. [Background technology]

[0002] For example, Patent Document 1 discloses a vehicle seat in which a recliner plate is provided with impact absorbing holes for reducing the load acting on the recliner during a collision. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-75726 Summary of the Invention [Problem to be solved by the invention]

[0004] The impact absorbing holes are configured to actively plastically deform specific portions of the recliner plate when a large load, including a downward component, acts on the recliner plate, thereby absorbing the load energy at the specific portions. The present disclosure discloses an example of a vehicle seat that takes this point into consideration. [Means for solving the problem]

[0005] A vehicle seat to be mounted on a vehicle desirably has at least one of the following constituent features, for example. That is, the constituent elements are a back frame (5A) that forms the skeleton of the seat back, a cushion frame (3A) that forms the skeleton of the seat cushion, a recliner (7) for changing the angle of the back frame (5A) relative to the cushion frame (3A), the recliner (7) having one side in the seat width direction fixed to the back frame (5A), and a recliner plate (9) to which the other side in the seat width direction of the recliner (7) is fixed and which is fixed to the rear end side of the cushion frame (3A), the recliner plate (9) having an impact absorbing hole (9B) provided below the rotation center axis (9A) of the recliner (7).

[0006] The recliner 7 and the back frame 5A are disposed on the inner side of the recliner plate 9 in the seat width direction. "Inner side" means the same side of the recliner plate 9 as the recliner 7 in the seat width direction.

[0007] Furthermore, when the portion of the recliner plate (9) fixed to the recliner (7) is defined as the first portion (91), the portion of the recliner plate (9) fixed to the cushion frame (3A) is defined as the second portion (92), and the portion located between the first portion (91) and the second portion (92) and located rearward of the impact absorbing hole (9B) is defined as the third portion (93), the third portion (93) is located inward relative to the second portion (92).

[0008] Furthermore, since the dimension (W1) of the step portion (94), which is the portion connecting the third portion (93) and the second portion (92), in the seat front-rear direction is smaller than the dimension (W2) of the third portion (93) in the seat front-rear direction, the cross-sectional area of ​​the step portion (94) is smaller than the cross-sectional area of ​​the third portion (93), and it is desirable that the bending rigidity of the third portion (93) and the range from the third portion (93) to the first portion (91) of the recliner plate (9) is greater than the bending rigidity of the step portion (94).

[0009] As a result, in this vehicle seat, when a large load, including a downward component, acts on the recliner plate 9, stress tends to concentrate on the step 94, causing the step 94 to undergo plastic deformation preferentially. Therefore, in combination with the effect of the impact absorbing holes 9B, the load acting on the recliner 7 during a collision can be reliably reduced.

[0010] The vehicle seat may have the following configuration, for example. That is, it is desirable that a recess (94A) recessed from the front side of the seat toward the rear side of the seat is provided in a portion connecting the third portion (93) and the second portion (92), and that the recess (94A) makes the dimension (W1) of the step portion (94) in the seat front-rear direction smaller than the dimension (W2) of the third portion (93) in the seat front-rear direction. This can prevent the back frame (5A) from falling significantly rearward when a load is applied.

[0011] In other words, if the recess is configured as a recess that is recessed from the rear side of the seat toward the front side of the seat, when the load acting on the back frame (5A) causes the step portion (94) to deform so that the gap of the recess decreases, the back frame (5A) will fall significantly backward.

[0012] In contrast, the recess (94A) of the vehicle seat is a recess that is recessed from the front side of the seat toward the rear side of the seat, so even if the step portion (94) deforms so that the gap of the recess (94A) narrows due to the load acting on the back frame (5A), deformation that would cause the back frame (5A) to fall significantly backward can be suppressed.

[0013] It is desirable that the top portion 94B of the recessed portion 94A is configured to be located on an imaginary line connecting the inflection points 94C of the stepped portion 94. Furthermore, it is desirable that the cushion frame 3A is disposed inside the recliner plate 9 in the seat width direction.

[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] 1 is a diagram showing a vehicle seat according to a first embodiment. [Figure 2] 3A and 3B are diagrams showing a recliner plate and the like according to the first embodiment. [Figure 3] 3A and 3B are diagrams showing a recliner plate and the like according to the first embodiment. [Figure 4] 3A and 3B are diagrams showing a recliner plate and the like according to the first embodiment. [Figure 5] 3A and 3B are diagrams showing a recliner plate and the like according to the first embodiment. [Figure 6] FIG. 2 is a view showing a recliner plate according to the first embodiment. [Figure 7] FIG. 2 is a view showing a recliner plate according to the first embodiment. [Figure 8] FIG. 2 is a view showing a recliner plate according to the first embodiment. [Figure 9] FIG. 10 is a diagram showing a load acting on a recliner plate. [Figure 10] 10A and 10B are diagrams illustrating deformation behavior of a recliner plate. [Figure 11] 10A and 10B are diagrams illustrating deformation behavior of a recliner plate. 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] In this embodiment, a vehicle seat according to the present disclosure is applied to a seat mounted in a vehicle such as a car. Arrows and diagonal lines indicating directions are added to each figure to facilitate understanding of the relationships between the figures and the shapes of components or parts.

[0018] Therefore, the vehicle seat is not limited to the orientation shown in each drawing. The orientation shown in each drawing is the orientation when the vehicle seat according to this embodiment is assembled to a vehicle. Diagonally shaded drawings do not always 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, such as "one," two or more components may be provided. The vehicle seat disclosed in the present disclosure includes at least one of the components, such as the components or parts, that are described with a reference numeral and the structural parts shown in the drawings.

[0020] (First embodiment) <1. Overview of vehicle seats> As shown in Fig. 1, the vehicle seat 1 includes at least a seat cushion 3, a seat back 5, a recliner 7, and a recliner plate 9. The seat cushion 3 is a portion for supporting the buttocks of the seated occupant. The seat back 5 is a portion for supporting the back of the seated occupant.

[0021] The seat cushion 3 has a cushion frame 3A etc. The seat back 5 has a back frame 5A etc. The cushion frame 3A forms the skeleton of the seat cushion 3. The back frame 5A forms the skeleton of the seat back 5.

[0022] The cushion frame 3A is composed of two side frames (hereinafter referred to as lower arms) 3B, 3C, a front panel 3D, a connecting pipe 3E, etc. The lower arm 3B is a strength member that is disposed at one end in the seat width direction and extends in the seat front-rear direction.

[0023] The lower arm 3C is a strength member located at the other end of the seat width direction and extending in the seat front-rear direction. The front panel 3D is a strength member located at the front end of the seat front-rear direction and connecting the two lower arms 3B, 3C. The connecting pipe 3E is a strength member located rearward of the front panel 3D and connecting the two lower arms 3B, 3C.

[0024] The back frame 5A is composed of two side frames 5B, 5C, an upper connecting panel 5D, a lower connecting panel 5E, etc. The side frame 5B is a strength member that is arranged on one end side in the seat width direction and extends substantially in the vertical direction.

[0025] The side frame 5C is a reinforcing member located on the other end of the seat width direction and extending in the up-down direction of the seat. The upper connecting panel 5D is a reinforcing member connecting the upper ends of the side frames 5B and 5C. The lower connecting panel 5E is a reinforcing member connecting the lower ends of the side frames 5B and 5C.

[0026] The recliner 7 is a mechanism for changing and adjusting the angle of the back frame 5A relative to the cushion frame 3A. The recliner plate 9 is fixed to the rear end side of the cushion frame 3A.

[0027] The back frame 5A is connected to the cushion frame 3A via a recliner 7 and a recliner plate 9. In this embodiment, the recliner 7 and the recliner plate 9 are disposed at one end and the other end in the seat width direction, respectively.

[0028] The recliners 7 and recliner plates 9 have shapes and structures that are approximately symmetrical with respect to the seat width direction. The following mainly describes the recliner 7 and recliner plate 9, etc., that are located on the left end side in the seat width direction.

[0029] <2. Details of recliner plates, etc.> As shown in Figure 2, the recliner 7 is fixed to the back frame 5A (specifically, the side frame 5B) on one side in the seat width direction (the right end face in Figure 2), and is fixed to the recliner plate 9 on the other side in the seat width direction (the left end face in Figure 2).

[0030] As shown in Figures 3 and 4, the lower arm 3B, the recliner 7, and the side frame 5B are arranged on the inner side (the right side in Figures 3 and 4) of the recliner plate 9 in the seat width direction. "Inner side" refers to the same side as the recliner 7 in the seat width direction with respect to the recliner plate 9.

[0031] In this embodiment, the side frame 5B and the recliner plate 9 are joined to the recliner 7 by welding. The recliner plate 9 is fixed to the rear end side of the cushion frame 3A (specifically, the lower arm 3B) by a fastener such as a bolt B1.

[0032] As shown in Fig. 5, the recliner plate 9 is provided with impact absorbing holes 9B. The impact absorbing holes 9B are provided below the central axis of rotation 9A of the recliner 7. The impact absorbing holes 9B reduce the load acting on the recliner 7 during a collision (see Patent Document 1, etc.).

[0033] The recliner plate 9 is provided with at least a first portion 91, a second portion 92, and a third portion 93 as part of the recliner 7. The first portion 91 and the second portion 92 are indicated by coarsely hatched lines in FIG.

[0034] The first portion 91 is a portion of the recliner plate 9 that is fixed to the recliner 7. The second portion 92 is a portion of the recliner plate 9 that is fixed to the cushion frame 3A.

[0035] The third portion 93 is located between the first portion 91 and the second portion 92 and is located rearward of the impact absorbing hole 9B in the seat front-rear direction. As shown in Fig. 4, the third portion 93 is located inward (to the right in Fig. 4) with respect to the second portion 92.

[0036] 6, a step occurs between the third portion 93 side and the second portion 92 side at the portion connecting the third portion 93 and the second portion 92. Hereinafter, the portion connecting the third portion 93 and the second portion 92 will be referred to as a step portion 94.

[0037] As shown in Figure 7, the dimension W1 of the step portion 94 in the seat's front-to-rear direction is smaller than the dimension W2 of the third portion 93 in the seat's front-to-rear direction, so the cross-sectional area of ​​the step portion 94 is smaller than the cross-sectional area of ​​the third portion 93.

[0038] Incidentally, in this embodiment, the diagonally shaded portion of the third portion 93 has been removed, so that the dimension W1 of the step portion 94 in the seat front-to-rear direction is smaller than the dimension W2 of the third portion 93 in the seat front-to-rear direction.

[0039] In other words, in this embodiment, a recess 94A recessed from the front side of the seat toward the rear side of the seat is provided in the step portion 94. The recess 94A makes the dimension W1 of the step portion 94 smaller than the dimension W2 of the third portion 93.

[0040] The recliner plate 9 according to this embodiment is formed by applying plastic processing such as press working to a single steel plate having a uniform thickness, so that the first portion 91 to the third portion 93 and the step portion 94 have substantially the same thickness.

[0041] Therefore, the bending rigidity (ie, second moment of area) of the third portion 93 of the recliner plate 9 and the range from the third portion 93 to the first portion 91 is greater than the bending rigidity of the step portion 94.

[0042] 8, the recess 94A is configured such that an apex 94B of the recess 94A is located on an imaginary line 94D that connects inflection points 94C of the step portion 94. The apex 94B of the recess 94A refers to the bottom of a convex recess that is recessed toward the rear of the seat.

[0043] In other words, since the third portion 93 is located more inward than the second portion 92, the step portion 94 connecting the second portion 92 and the third portion 93 has a continuous series of points where the slope is reversed, that is, inflection points 94C.

[0044] Since step portion 94 is formed by bending a plate material that constitutes recliner plate 9, inflection point 94C describes one imaginary line 94D. Furthermore, top portion 94B of recess 94A is located at the seat front end of imaginary line 94D.

[0045] 3. Features of the vehicle seat according to this embodiment In the vehicle seat 1 according to this embodiment, the bending rigidity of the step portion 94 is small, so when a large load with a downward component acts on the recliner plate 9, stress tends to concentrate on the step portion 94. As a result, the step portion 94 undergoes plastic deformation preferentially.

[0046] Therefore, the effect of the impact absorbing holes 9B, that is, the effect of actively plastically deforming specific areas set on the recliner plate 9 to absorb load energy at those specific areas, can reliably reduce the load acting on the recliner 7 during a collision.

[0047] A recess 94A recessed from the front side of the seat toward the rear side of the seat is provided in a portion connecting the third portion 93 and the second portion 92, and the recess 94A makes the dimension W1 of the step portion 94 in the seat front-rear direction smaller than the dimension W2 of the third portion 93 in the seat front-rear direction. This makes it possible to prevent the back frame 5A from falling significantly rearward when a load is applied.

[0048] In other words, if the recess were configured as a recess that is recessed from the rear end side of the recliner plate 9 toward the front side of the seat, that is, a recess that is convex in the opposite direction to the recess 94A in this embodiment, when the load acting on the back frame 5A causes the step portion 94 to deform so that the gap of the recess is reduced, the back frame 5A will fall significantly backward.

[0049] In contrast, the recess 94A of the vehicle seat 1 is a recess that is recessed from the front side of the seat toward the rear side of the seat, so even if the step portion 94 is deformed so that the gap of the recess 94A becomes smaller due to the load acting on the back frame 5A, deformation that would cause the back frame 5A to fall significantly rearward can be suppressed.

[0050] <Deformation analysis of recliner plates, etc.> 10 and 11 show the deformation of the recliner plate 9 when a large downward load acts on the recliner plate 9 via the seat back 5 and the recliner 7 (see FIG. 9).

[0051] That is, when a load Fo is input to the first portion 91 of the recliner plate 9, the load Fo is transmitted through the third portion 93 and then to the stepped portion 94. As a result, a force F1 is generated in the stepped portion 94.

[0052] Since the third portion 93 is located more inward than the second portion 92, a moment Mo is generated around the step portion 94. The moment Mo acts in a direction that tilts the third portion 93 inward.

[0053] Then, when the third portion 93 begins to deform inward due to the moment Mo (see the solid line in FIG. 10), the moment Mo increases as the deformation progresses, and the deformation of the third portion 93 progresses further so that the third portion 93 buckles (see the solid line in FIG. 11). Thereafter, as the deformation of the third portion 93 progresses further, the third portion 93 and the like are almost completely destroyed.

[0054] However, the first portion 91 and the second portion 92 are less deformed than the third portion 93, and the recliner plate 9 and the recliner 7 are maintained in a joined state. In other words, in the vehicle seat 1 according to this embodiment, even if the recliner plate 9 is broken, the occurrence of destructive deformation such as separation of the recliner plate 9 from the recliner 7 is suppressed.

[0055] In other words, in the vehicle seat 1 according to this embodiment, when a large load is applied, the stepped portion 94 of the recliner plate 9 is prevented from being displaced significantly inward, and the first portion 91 is prevented from being displaced outward (see FIG. 4). This prevents the recliner plate 9 from being deformed to the outside, such as when it is separated from the recliner 7.

[0056] (Other embodiments) The recess 94A in the above-described embodiment is recessed from the front side of the seat toward the rear side of the seat. However, the present disclosure is not limited to this. That is, the present disclosure may be recessed, for example, from the rear end side of the recliner plate 9 toward the front side of the seat.

[0057] In the above-described embodiment, the first portion 91 to the third portion 93 and the step portion 94 have substantially the same thickness. However, the present disclosure is not limited to this. That is, the present disclosure may have a configuration in which, for example, the step portion 94 has a smaller thickness than the other portions.

[0058] In the above-described embodiment, the apex 94B of the recess 94A is located at the seat front end of the imaginary line 94D connecting the inflection points 94C. However, the present disclosure is not limited to this. That is, in the present disclosure, for example, the recess 94A may be a simple rectangular depression.

[0059] In the above-described embodiment, the lower arm 3B, the recliner 7, and the side frame 5B are disposed on the inner side of the recliner plate 9 in the seat width direction. However, the present disclosure is not limited to this. That is, in the present disclosure, for example, the lower arm 3B may be disposed on the outer side of the recliner plate 9 in the seat width direction.

[0060] 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.

[0061] 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]

[0062] 7... Reclining chair 9... Reclining plate 9A…Rotation center axis 9B... Shock absorption hole 91… Part 1 92… Part 2 93… 3rd part 94... Step 94A... Recess

Claims

1. In a vehicle seat to be mounted on a vehicle, A back frame that forms the framework of the seat back, A cushion frame that forms the framework of the seat cushion, a recliner for changing the angle of the back frame relative to the cushion frame, the recliner having one side in the seat width direction fixed to the back frame; a recliner plate to which the other side of the recliner in the seat width direction is fixed and which is fixed to a rear end side of the cushion frame, the recliner plate having an impact absorbing hole provided below a rotation center axis of the recliner, A portion of the recliner plate fixed to the recliner is defined as a first portion, and a portion of the recliner plate fixed to the cushion frame is defined as a second portion, a third portion is a portion located between the first portion and the second portion and located rearward of the shock absorbing hole; When the same side as the recliner with respect to the recliner plate in the seat width direction is defined as the inner side, the recliner and the back frame are disposed inner with respect to the recliner plate in the seat width direction, When the third portion is located more inward than the second portion and a portion connecting the third portion and the second portion is a step portion, a dimension of the step portion in the seat front-rear direction is smaller than a dimension of the third portion in the seat front-rear direction, so that a cross-sectional area of ​​the step portion is smaller than a cross-sectional area of ​​the third portion, Furthermore, the flexural rigidity of the third portion of the recliner plate and the range from the third portion to the first portion is greater than the flexural rigidity of the stepped portion.

2. a recess recessed from the seat front side toward the seat rear side is provided in a portion connecting the third portion and the second portion, 2. The vehicle seat according to claim 1, wherein the recessed portion makes the dimension of the step portion in the seat front-rear direction smaller than the dimension of the third portion in the seat front-rear direction.

3. 3. The vehicle seat according to claim 2, wherein the recess is configured so that a top of the recess is positioned on an imaginary line connecting the inflection points of the step portion.

4. 4. The vehicle seat according to claim 1, wherein the cushion frame is disposed on an inner side of the recliner plate in the seat width direction.

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