Vehicle seats

Abstract

To provide a vehicular seat which can reduce impact input to a recliner at the time of collision, in such a structure that a lower arm is fixed to a vehicle.SOLUTION: A vehicular seat includes a lower arm mounted on a vehicle, and a recliner for swinging a back frame to the lower arm. The lower arm has an arm body mounted with the recliner, a first fixing part mounted on the vehicle below, and a second fixing part mounted on the vehicle backward. The arm body has a first recess which is arranged between the recliner and the first fixing part in a vertical direction and extends from the end of the arm body, and a second recess which is arranged between the recliner and the second fixing part in a front / back direction and extends from the end of the arm body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to vehicle seats. [Background technology]

[0002] 2. Description of the Related Art In a vehicle seat disposed in a vehicle or the like, a recliner is provided between a back frame and a lower arm provided below the back frame so as to enable a seat back to swing relative to a seat cushion.

[0003] In such vehicle seats, a structure in which the lower arm is made easily deformable in order to absorb the impact on the back frame that occurs during a vehicle collision and protect the recliner is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 103920 Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned deformation structure of the lower arm is premised on the lower arm being connected to the cushion frame, and therefore a structure in which the lower arm is directly fixed to the vehicle cannot adequately absorb impact.

[0006] An object of one aspect of the present disclosure is to provide a vehicle seat that can reduce impact input to a recliner during a collision in a structure in which a lower arm is fixed to a vehicle. [Means for solving the problem]

[0007] One aspect of the present disclosure is a vehicle seat (1) including a seat cushion (2), a seat back (3) capable of swinging in the fore-and-aft direction of the seat relative to the seat cushion (2), a back frame (4) supporting the seat back (3), a first lower arm (5) configured to be mounted to a vehicle, and a recliner (6) connected to the back frame (4) and the first lower arm (5) and configured to swing the back frame (4) in the fore-and-aft direction of the seat relative to the first lower arm (5).

[0008] The first lower arm (5) has a plate-shaped arm body (51) to which the recliner (6) is attached, a first fixing portion (52) configured to be attached to the vehicle below the recliner (6), and a second fixing portion (53) configured to be attached to the vehicle behind the seat relative to the recliner (6).

[0009] The arm body (51) is arranged between the recliner (6) and the first fixed portion (52) in the up-down direction, and has a first recess (511) that extends from the end of the arm body (51) toward the inside of the arm body (51) and is recessed in the seat width direction, and a second recess (512) that is arranged between the recliner (6) and the second fixed portion (53) in the seat front-rear direction, and extends from the end of the arm body (51) toward the inside of the arm body (51) and is recessed in the seat width direction.

[0010] According to this configuration, when an impact is applied to the seat back (3) from behind, the first recess (511) undergoes compressive deformation, and the second recess (512) undergoes tensile deformation so as to reduce the size of the recess. These deformations reduce the impact applied to the recliner (6) in the event of a frontal collision of the vehicle.

[0011] Furthermore, when an impact is applied to the seat back (3) from the front, the second recess (512) is compressively deformed, and the first recess (511) is tensilely deformed so as to reduce the size of the recess. These deformations reduce the impact applied to the recliner (6) in the event of a rear-end collision of the vehicle.

[0012] Therefore, the strength required for the back frame (4) and the recliner (6) to withstand an impact during a vehicle collision is reduced, and the cost and weight of the vehicle seat (1) can be reduced.

[0013] One aspect of the present disclosure may further include a second lower arm (7) connected to the back frame (4) at a position separated from the first lower arm (5) in the seat width direction, and a rod (9) connecting the first lower arm (5) and the second lower arm (7) in the seat width direction. At least a portion of the first recess (511) may be disposed above the rod (9). With this configuration, it is possible to enhance the impact absorption effect of the first recess (511) when an impact is input to the seat back (3) from behind.

[0014] In one aspect of the present disclosure, the first recess (511) may be recessed inward in the seat width direction in the arm body (51). With this configuration, when an impact is applied to the seat back (3) from behind, the load applied from the outer side in the seat width direction rather than the first lower arm (5) can be more easily absorbed by the first recess (511).

[0015] In one aspect of the present disclosure, the second recess (512) may be recessed outward in the seat width direction in the arm body (51). With this configuration, the load of the body of a person seated in the vehicle seat (1) during a rear collision can be easily absorbed by the second recess (512).

[0016] In one aspect of the present disclosure, the first recess (511) and the second recess (512) may each have a shape that widens and deepens toward the end of the arm body (51). With this configuration, the lengths of the first recess (511) and the second recess (512) at the end of the arm body (51) are increased, and these recesses are more likely to deform. As a result, the amount of shock absorption can be increased.

[0017] Note that the symbols in the above parentheses 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 above parentheses. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic perspective view showing a vehicle seat according to an embodiment. [Diagram 2] FIG. 2 is a schematic perspective view of a first lower arm, a first recliner, and a rod in the vehicle seat of FIG. [Diagram 3] FIG. 3 is a schematic perspective view of the first lower arm of FIG. [Figure 4] FIG. 4 is a schematic left side view of the first lower arm and the first recliner of FIG. [Diagram 5] FIG. 5 is a schematic right side view of the first lower arm of FIG. 2. FIG. [Figure 6] 6A is a schematic plan view of the first lower arm in FIG. 2, and FIG. 6B is a schematic bottom view of the first lower arm in FIG. [Figure 7] FIG. 7 is a schematic perspective view showing a first recliner and a second recliner in an embodiment different from that in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First embodiment] [1-1. Configuration] The vehicle seat 1 shown in FIG. 1 includes a seat cushion 2, a seat back 3, a back frame 4, a first lower arm 5, a first recliner 6, a second lower arm 7, a second recliner 8, and a rod 9.

[0020] The vehicle seat 1 is used as a seat for a passenger vehicle. Specifically, the vehicle seat 1 constitutes the left seat in the rear of the passenger vehicle. On the right side of the vehicle seat 1, a two-seater seat is installed in which the right seat and the center seat are integrated.

[0021] In the following description and in each drawing, the directions refer to the directions when the vehicle seat 1 is assembled to a vehicle (i.e., a passenger car). In this embodiment, the seat width direction coincides with the left-right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

[0022] The seat cushion 2 is a portion for supporting the buttocks of a seated occupant. The seat back 3 is a portion for supporting the back of the seated occupant. The seat back 3 is capable of swinging relative to the seat cushion 2 in the front-rear direction of the seat.

[0023] The back frame 4 supports the seat back 3 and is capable of swinging in the front-rear direction of the seat together with the seat back 3. The back frame 4 has a first side frame 41, a second side frame 42, an upper frame 43, and a connecting member 44.

[0024] The first side frame 41 and the second side frame 42 extend in the up-down direction and are spaced apart from each other in the seat width direction. The first side frame 41 is disposed on the right side of the second side frame 42.

[0025] The upper frame 43 connects an upper end of the first side frame 41 and an upper end of the second side frame 42 in the seat width direction. The connecting member 44 connects the first side frame 41 and the second side frame 42 in the seat width direction below the upper frame 43.

[0026] <First lower arm> The first lower arm 5 is a plate-shaped frame configured to be attached to a vehicle.

[0027] The first lower arm 5 is connected to a lower end of the first side frame 41 via the first recliner 6. That is, the first side frame 41 is connected to the vehicle by the first lower arm 5. The first lower arm 5 is also disposed outward in the seat width direction from the first side frame 41. Features of the first lower arm 5 will be described later.

[0028] <First recliner> The first recliner 6 is connected to the first side frame 41 of the back frame 4 and the first lower arm 5.

[0029] The first recliner 6 is a known device configured to rock the back frame 4 in the front-rear direction of the seat relative to the first lower arm 5 (i.e., the vehicle and the seat cushion 2). The first recliner 6, together with the second recliner 8, constitute a manual reclining device.

[0030] 2, the first recliner 6 has a recliner plate 61, a recliner body 62, a rocking force imparting spring 63, and a release lever 64. The recliner plate 61 is overlapped with the first lower arm 5 from the inner side in the seat width direction (i.e., the left side). The recliner plate 61 is fixed to the first lower arm 5 by welding.

[0031] The recliner body 62 is connected to the inner (i.e., left) plate surface of the recliner plate 61 and the first side frame 41. The recliner body 62 has a locking mechanism that switches between restricting (i.e., locking) the rocking of the first side frame 41 and not restricting it. The locking control of the recliner body 62 is performed by a release lever 64.

[0032] The rocking force imparting spring 63 constitutes a rocking force generating mechanism that imparts a rocking force to the first side frame 41 relative to the recliner plate 61. The rocking force imparting spring 63 is connected to the first side frame 41 and the recliner plate 61.

[0033] <Second lower arm> The second lower arm 7 shown in FIG. 1 is a plate-shaped frame configured to be attached to a vehicle.

[0034] The second lower arm 7 is connected to the back frame 4 at a position separated from the first lower arm 5 in the seat width direction. Specifically, the second lower arm 7 is connected to a lower end of the second side frame 42 via the second recliner 8. In other words, the second side frame 42 is connected to the vehicle by the second lower arm 7.

[0035] <Second recliner> The second recliner 8 is connected to the second side frame 42 of the back frame 4 and the second lower arm 7.

[0036] The second recliner 8 is a known device configured to cooperate with the first recliner 6 to rock the back frame 4 in the front-rear direction of the seat relative to the second lower arm 7 (that is, the vehicle and the seat cushion 2).

[0037] <Rod> The rod 9 is a cylindrical member that connects the first lower arm 5 and the second lower arm 7 in the seat width direction.

[0038] The rod 9 penetrates in the thickness direction of each of the first lower arm 5 and the second lower arm 7. The rod 9 is fixed to the first lower arm 5 and the second lower arm 7 by, for example, welding.

[0039] <Features of the first lower arm> As shown in FIG. 3, the first lower arm 5 has an arm body 51, a first fixed portion 52, a second fixed portion 53, and a third fixed portion .

[0040] (Arm body) The arm body 51 is a plate-like portion to which the first recliner 6 is fixed. The first recliner 6 is fixed to a plate surface (that is, the left surface) of the arm body 51 on the inner side in the seat width direction by welding.

[0041] The thickness direction of the arm body 51 coincides with the seat width direction. The arm body 51 has a first recess 511, a second recess 512, a recliner fixed end 513, and a rod insertion hole 514.

[0042] The first recess 511 is a portion where a part of the arm body 51 is recessed in the seat width direction (i.e., the thickness direction of the arm body 51). Specifically, the first recess 511 is recessed inward in the seat width direction so that an outer surface of the first recess 511 protrudes inward in the seat width direction (i.e., to the left).

[0043] The first recess 511 extends from the front end of the arm main body 51 toward the inside of the arm main body 51. The first recess 511 has a shape that widens and becomes deeper (i.e., the amount of recession) as it approaches the front end of the arm main body 51 from the inside of the arm main body 51 (i.e., toward the front). When viewed from the seat width direction, the first recess 511 has a triangular shape with an apex located inside the arm main body 51 and a base defined by the front end of the arm main body 51.

[0044] The second recess 512 is a portion where a part of the arm body 51 is recessed in the seat width direction. Specifically, the second recess 512 is recessed outward in the seat width direction so that an outer surface of the second recess 512 protrudes outward in the seat width direction (i.e., to the right).

[0045] The second recess 512 extends from the upper end of the arm body 51 toward the inside of the arm body 51. The second recess 512 has a shape that widens and becomes deeper as it approaches the upper end of the arm body 51 from the inside of the arm body 51 (i.e., toward the top). When viewed from the seat width direction, the second recess 512 has a triangular shape with an apex located inside the arm body 51 and a base defined by the upper end of the arm body 51.

[0046] The recliner fixed end 513 is formed by a part of the upper end of the arm body 51. The recliner fixed end 513 is located above the first recessed portion 511 and further forward than the second recessed portion 512 in the seat.

[0047] 4, the recliner fixed end 513 overlaps with the recliner plate 61 of the first recliner 6 in the seat width direction. The recliner plate 61 is welded to the recliner fixed end 513 by multiple weld beads W formed to straddle the recliner fixed end 513 and the recliner plate 61.

[0048] The rod 9 is inserted through the rod insertion hole 514. As shown in Fig. 5, the rod insertion hole 514 is disposed in a region between the first recess 511 and the first fixed portion 52 in the arm body 51.

[0049] (1st fixed part) The first fixing portion 52 shown in FIG. 3 is a plate-shaped portion configured to be attached to the vehicle below the first recliner 6.

[0050] The first fixing portion 52 protrudes inward in the seat width direction from the arm body 51. The first fixing portion 52 is configured by bending a plate that constitutes the arm body 51, and is integrated with the arm body 51.

[0051] A reinforcing portion 515 for increasing the strength of the first fixing portion 52 is provided above the first fixing portion 52. The reinforcing portion 515 is a portion of the arm body 51 bent in the seat width direction together with the first fixing portion 52. The length of the reinforcing portion 515 in the seat width direction is smaller than the length of the first fixing portion 52 in the seat width direction.

[0052] First fixing portion 52 has first fixing hole 521 and first seat 522. A bolt for fastening first fixing portion 52 to a fixed portion provided on the vehicle is inserted into first fixing hole 521. First seat 522 is disposed so as to surround first fixing hole 521.

[0053] (Second fixed part) The second fixing portion 53 is a plate-shaped portion configured to be attached to the vehicle rearward of the first recliner 6.

[0054] The second fixing portion 53 protrudes inward in the seat width direction from the arm body 51. The second fixing portion 53 is configured by bending a plate that constitutes the arm body 51, and is integrated with the arm body 51.

[0055] The second fixing portion 53 has a second fixing hole 531 and a second seat 532. A bolt for fastening the second fixing portion 53 to a fixed portion provided on the vehicle is inserted into the second fixing hole 531. The second seat 532 is disposed so as to surround the second fixing hole 531.

[0056] (3rd fixed part) 6A and 6B is a plate-shaped portion configured to be attached to the vehicle rearward of the first recliner 6. The third fixed portion 54 is fixed by welding to a plate surface of the arm main body 51 on the outer side in the seat width direction. The third fixed portion 54 protrudes from the arm main body 51 outward in the seat width direction.

[0057] The third fixing portion 54 has a third fixing hole 541 and a third seat 542. A bolt for fastening the third fixing portion 54 to a fixed portion provided on the vehicle is inserted into the third fixing hole 541. The third seat 542 is disposed so as to surround the third fixing hole 541.

[0058] (Position of recess) 4, neither the first recess 511 nor the second recess 512 overlaps with the first recliner 6 in the seat width direction. In other words, the first recess 511 and the second recess 512 are disposed at positions that do not overlap with both the recliner plate 61 and the recliner main body 62.

[0059] The first recess 511 is located between the first recliner 6 and the first fixed portion 52 in the up-down direction. Specifically, the front end of the first recess 511 is located below the recliner main body 62 of the first recliner 6, and the rear end of the first recess 511 is located rearward of the recliner main body 62.

[0060] 5, the rear end of the first recess 511 is located above the first fixing portion 52, and the front end of the first recess 511 is located further forward of the seat than the first fixing portion 52. Specifically, when viewed from the seat width direction, a first imaginary straight line L1 connecting the swing central axis P1 of the recliner body 62 and the fastening center P2 of the first fixing portion 52 (i.e., the center of gravity of the first fixing hole 521) overlaps with the first recess 511. The swing central axis P1 of the recliner body 62 is parallel to the seat width direction.

[0061] Furthermore, the rear end of the first recess 511 is located above the rod 9 (that is, the rod insertion hole 514). A part of the front end of the first recess 511 overlaps with the rod 9 in the seat front-rear direction.

[0062] The second recess 512 is located between the first recliner 6 and the second fixed portion 53 in the seat front-rear direction. Specifically, as shown in Fig. 4, the upper end of the second recess 512 is located behind the seat of the recliner main body 62 of the first recliner 6, and the lower end of the second recess 512 is located below the recliner main body 62.

[0063] 5, the second recess 512 is located in front of and above the second fixing portion 53 and the third fixing portion 54. Specifically, when viewed from the seat width direction, a second imaginary straight line L2 connecting the swing central axis P1 of the recliner body 62 and the fastening center P3 of the second fixing portion 53 (i.e., the center of gravity of the second fixing hole 531) overlaps with the second recess 512. Furthermore, the second recess 512 is located behind and above the first recess 511.

[0064] [1-2. Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) When an impact is applied to the seat back 3 from behind, the first recess 511 undergoes compressive deformation, and the second recess 512 undergoes tensile deformation so that the recess becomes smaller. These deformations reduce the impact applied to the first recliner 6 in the event of a frontal collision of the vehicle.

[0065] Furthermore, when an impact is applied to the seat back 3 from the front, the second recess 512 undergoes compressive deformation, and the first recess 511 undergoes tensile deformation so that the recess becomes smaller. These deformations reduce the impact applied to the first recliner 6 in the event of a rear-end collision of the vehicle.

[0066] Therefore, the strength required for the back frame 4 and the first recliner 6 to withstand an impact during a vehicle collision is reduced, and the cost and weight of the vehicle seat 1 can be reduced.

[0067] (1b) At least a portion of the first recess 511 is disposed above the rod 9, which enhances the effect of absorbing impact by the first recess 511 when an impact is applied to the seat back 3 from behind.

[0068] (1c) Because the first recess 511 is recessed toward the inside in the seat width direction, when an impact is applied to the seat back 3 from behind, the first recess 511 can more easily absorb the load applied from the outside in the seat width direction than the first lower arm 5.

[0069] (1d) Since the second recess 512 is recessed toward the outside in the seat width direction, the second recess 512 can easily absorb the load of the body of a person seated in the vehicle seat 1 during a rear-end collision. In addition, the second recess 512 deforms toward the outside in the seat width direction, compressing the welded portion of the third fixing portion 54. Therefore, peeling of the third fixing portion 54 is suppressed.

[0070] (1e) Since the first recess 511 and the second recess 512 have a shape that widens and becomes deeper toward the end of the arm body 51, the length of the first recess 511 and the second recess 512 at the end of the arm body 51 increases, and these recesses become more likely to deform. As a result, the amount of shock absorption can be increased.

[0071] 2. Other embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

[0072] (2a) In the vehicle seat of the above embodiment, the first recess does not necessarily have to be disposed above the rod. For example, the first recess may be disposed in front of or below the rod.

[0073] (2b) In the vehicle seat of the above embodiment, the first recess may be recessed outward in the seat width direction, and the second recess may be recessed inward in the seat width direction.

[0074] (2c) In the vehicle seat of the above embodiment, the shapes of the first recess and the second recess are not limited to those described above. For example, the first recess and the second recess may have a shape with a constant width or depth.

[0075] (2d) In the vehicle seat of the above embodiment, the first recliner may be combined with the second recliner to form an electrically-operated power reclining device. For example, as shown in Fig. 7, the first recliner 6 may have an actuator 6A instead of a rocking force imparting spring. The actuator 6A is a power source that imparts a rocking force to the first side frame 41 relative to the recliner plate 61.

[0076] The second recliner 8 also has an actuator 8A similar to that of the first recliner 6. The first recliner 6 and the second recliner 8 are connected in the seat width direction by a connecting rod 10. The connecting rod 10 synchronizes the first recliner 6 and the second recliner 8.

[0077] (2e) The vehicle seat of the above embodiment can also be applied to seats used in automobiles other than passenger cars, and seats used in vehicles other than automobiles, such as railroad cars, ships, and aircraft.

[0078] (2f) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. In addition, a part of the configuration of the above embodiments may be omitted. In addition, at least a part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. Note that all aspects included in the technical idea identified from the wording of the claims are embodiments of the present disclosure. [Explanation of symbols]

[0079] 1...vehicle seat, 2...seat cushion, 3...seat back, 4...back frame, 5...First lower arm, 6...First recliner, 7...Second lower arm, 8...second recliner, 9...rod, 41...first side frame, 42... second side frame, 43... upper frame, 44... connecting member, 51: arm body; 52: first fixing portion; 53: second fixing portion; 54: third fixing portion; 61... recliner plate, 62... recliner body, 63... rocking force imparting spring, 64... release lever, 511... first recess, 512... second recess, 513: recliner fixed end; 514: rod insertion hole; 515: reinforcement portion; 521: first fixing hole; 522: first base; 531: second fixing hole; 532...second base, 541...third fixing hole, 542...third base.

Claims

1. Seat cushion and a seat back that is pivotable in a front-rear direction relative to the seat cushion; A back frame supporting the seat back; A first lower arm configured to be attached to a vehicle; a recliner connected to the back frame and the first lower arm and configured to swing the back frame relative to the first lower arm in a seat front-rear direction; Equipped with The first lower arm includes: A plate-shaped arm body to which the recliner is attached; A first fixing portion configured to be attached to the vehicle below the recliner; A second fixing portion configured to be attached to the vehicle rearward of the seat relative to the recliner; having The arm body includes: a first recess disposed between the recliner and the first fixed portion in the up-down direction, extending from an end of the arm body toward the inside of the arm body, and recessed in the seat width direction; a second recess disposed between the recliner and the second fixed portion in the seat front-rear direction, extending from an end of the arm body toward the inside of the arm body and recessed in the seat width direction; A vehicle seat having the above features.

2. 2. The vehicle seat according to claim 1, a second lower arm connected to the back frame at a position spaced apart from the first lower arm in a seat width direction; a rod connecting the first lower arm and the second lower arm in a seat width direction; Further equipped with A vehicle seat, wherein at least a portion of the first recess is positioned above the rod.

3. The vehicle seat according to claim 1 or 2, The first recess is recessed inward in a seat width direction in the arm body.

4. The vehicle seat according to any one of claims 1 to 3, The second recess is recessed outward in a seat width direction in the arm body.

5. The vehicle seat according to any one of claims 1 to 4, The vehicle seat, wherein the first recess and the second recess each have a shape that increases in width and depth toward the end of the arm body.

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