Vehicle seats

Abstract

The present disclosure relates to a seat for a vehicle. The present disclosure provides a seat for a vehicle that can reduce the torque applied to a reclining angle adjuster during a collision. A vehicle seat of one embodiment of the present disclosure includes: a lower arm, which is mounted on a seat cushion frame; and a reclining angle adjuster, which is connected to a backrest frame and to the lower arm, and causes the backrest frame to swing in the front-rear direction of the seat relative to the lower arm. The lower arm has a plate-shaped reclining angle adjustment plate and a shock absorbing hole, the reclining angle adjuster is fixed to the reclining angle adjustment plate, and the reclining angle adjustment plate is fixed to the seat cushion frame at a plurality of fixing portions, and the shock absorbing holes are provided on the reclining angle adjustment plate. When viewed from a direction parallel to the rotation center axis of the reclining angle adjuster, the shock absorbing hole is arranged at a position sandwiched between the rotation center axis of the reclining angle adjuster and the fixing portion located at the bottom of the plurality of fixing portions.

Description

Technical Field

[0001] The present disclosure relates to a vehicle seat. Background Art

[0002] In a vehicle seat installed in a vehicle or the like, a reclining angle adjuster is provided between a backrest frame and a lower arm connected to the seat cushion frame to enable the seat back to swing relative to the seat cushion (see US Pat. No. 10,752,138). Summary of the Invention

[0003] In vehicle seats with a recliner mounted on the lower arm, the load applied to the backrest frame during a vehicle collision is transmitted as torque to the recliner. If this torque is continuously input to the recliner, it can damage the recliner and the connection between the recliner and the backrest frame, potentially causing the backrest frame to tip over.

[0004] One aspect of the present disclosure preferably provides a vehicle seat capable of reducing torque applied to a reclining angle adjuster at the time of a collision.

[0005] One embodiment of the present disclosure relates to a vehicle seat comprising: a seat cushion; a seat back capable of swinging relative to the seat cushion in a seat front-rear direction; a cushion frame supporting the seat cushion; a backrest frame supporting the seat back; a lower arm mounted on the cushion frame; and a reclining angle adjuster connected to the backrest frame and to the lower arm, the reclining angle adjuster being configured to swing the backrest frame relative to the lower arm in the seat front-rear direction.

[0006] The lower arm includes a plate-shaped reclining angle adjustment plate and a shock-absorbing hole. The reclining angle adjuster is fixed to the reclining angle adjustment plate, which is fixed to the seat cushion frame at multiple fixing portions. The shock-absorbing hole is provided on the reclining angle adjustment plate. When viewed from a direction parallel to the rotational axis of the reclining angle adjuster, the shock-absorbing hole is located between the rotational axis of the reclining angle adjuster and the lowest fixing portion among the multiple fixing portions.

[0007] The lower arm further includes a bent portion and a first rib. The bent portion is continuously arranged with the impact absorbing hole at a position closer to the rear of the seat than the impact absorbing hole, and the bent portion is bent in the thickness direction of the reclining angle adjustment plate in a manner of deforming with the impact absorbing hole as a starting point. The first rib extends with the impact absorbing hole as a starting point at a position closer to the front of the seat than the impact absorbing hole, and the first rib protrudes in the thickness direction of the reclining angle adjustment plate. The bent portion and the first rib are capable of compressive deformation in the up and down directions.

[0008] With this configuration, the impact-absorbing holes are located along the path where load is transferred from the reclining angle adjuster, which is receiving torque, to the seat cushion frame. This induces strain in the lower arm near the impact-absorbing holes, which absorbs energy. This reduces the torque applied to the reclining angle adjuster.

[0009] As a result, damage to the recliner is minimized, and deformation of the seat cushion frame is suppressed. Furthermore, the impact-absorbing holes absorb strain generated when the recliner is joined to the back frame. This prevents damage to the joint between the recliner and back frame when torque is applied to the recliner.

[0010] Furthermore, with this structure, when torque is input to the recliner, the bent portion can be actively deformed to absorb energy. Furthermore, the first rib can propagate strain in the lower arm toward the front of the seat, thereby enhancing the effect of reducing torque in the recliner. Furthermore, the first rib can suppress bending of the lower arm in the thickness direction.

[0011] In one embodiment of the present disclosure, the width of the first rib in the thickness direction of the tilt angle adjustment plate can be greater than the width of the curved portion in the thickness direction of the tilt angle adjustment plate. This configuration prioritizes deformation of the curved portion over deformation of the first rib, thereby further reducing torque in the tilt angle adjuster.

[0012] In one embodiment of the present disclosure, the end of the first rib located in front of the seat can be located closer to the front of the seat than the junction between the reclining angle adjuster and the reclining angle adjustment plate. This structure can suppress the propagation of strain to the junction, thereby preventing damage to the junction.

[0013] In one embodiment of the present disclosure, the lower arm may further include a second rib extending from the end of the tilt angle adjustment plate toward the interior of the tilt angle adjustment plate above the curved portion, and the second rib protruding in the thickness direction of the tilt angle adjustment plate. With this structure, the second rib deforms when a load is applied to the lower arm, thereby enhancing the energy absorption function of the lower arm.

[0014] In one embodiment of the present disclosure, the longitudinal direction of the first rib can intersect with the longitudinal direction of the second rib when viewed from a direction parallel to the rotational axis of the tilt angle adjuster. With this structure, the second rib generates a reaction force that counteracts the energy absorbed by the first rib. This prevents damage to the lower arm.

[0015] In one embodiment of the present disclosure, the impact-absorbing hole may include a first edge, a second edge, an upper protrusion, and a lower protrusion. The first edge is connected to the curved portion, the second edge is connected to the first rib, the upper protrusion is located above the first and second edges, and the lower protrusion is located below the first and second edges. This structure can facilitate the propagation of strain from the impact-absorbing hole to the curved portion and the first rib.

[0016] In one embodiment of the present disclosure, the shock absorbing hole may have a shape in which the width thereof decreases downward. According to the above structure, the energy absorption efficiency near the shock absorbing hole can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic perspective view showing a vehicle seat according to an embodiment.

[0018] Figure 2 yes Figure 1 A schematic three-dimensional diagram of a lower arm and a reclining angle adjuster of a vehicle seat.

[0019] Figure 3A yes Figure 2 A schematic perspective view of the lower arm.

[0020] Figure 3B yes Figure 3A Schematic dorsal view of the lower arm.

[0021] Figure 4 yes Figure 2 Schematic right-side view of the lower arm and tilt angle adjuster. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.

[0023] [1. First embodiment]

[0024] [1-1. Structure]

[0025] Figure 1 The illustrated vehicle seat 1 includes a seat cushion 2 , a seat back 3 , a seat cushion frame 4 , a back frame 5 , a lower arm 6 , and a reclining angle adjuster 7 .

[0026] The vehicle seat 1 is used as a passenger seat in a passenger vehicle. The directions described below and in the accompanying drawings represent the orientation of the vehicle seat 1 when installed in a vehicle (i.e., a passenger vehicle). In this embodiment, the seat width coincides with the left-right direction of the vehicle, and the seat front coincides with the front of the vehicle.

[0027] The seat cushion 2 is a portion for supporting the buttocks of a seated person, etc. The seat back 3 is a portion for supporting the back of a seated person. The seat back 3 is capable of swinging relative to the seat cushion 2 in the seat front-rear direction.

[0028] <Cushion frame>

[0029] The seat cushion frame 4 supports the seat cushion 2. The seat cushion frame 4 includes a first side frame 41, a second side frame 42, and a front plate 43.

[0030] The first side frame 41 and the second side frame 42 each extend in the seat front-to-rear direction and are plate-shaped members spaced apart from each other in the seat width direction. The first side frame 41 is positioned to the left of the second side frame 42. The thickness directions of the first and second side frames 41, 42 are parallel to the seat width direction. The front plate 43 is positioned so as to span the front ends of the first and second side frames 41, 42.

[0031] <Backrest frame>

[0032] The back frame 5 supports the seat back 3 and is capable of swinging in the seat front-rear direction together with the seat back 3. The back frame 5 includes a third side frame 51, a fourth side frame 52, an upper plate 53, and a lower plate 54.

[0033] The third side frame 51 and the fourth side frame 52 extend in the vertical direction and are spaced apart from each other in the seat width direction. The third side frame 51 is located to the left of the fourth side frame 52. The thickness directions of the third side frame 51 and the fourth side frame 52 are parallel to the seat width direction.

[0034] The upper plate 53 connects the upper end of the third side frame 51 and the upper end of the fourth side frame 52 in the seat width direction. The lower plate 54 connects the third side frame 51 and the fourth side frame 52 in the seat width direction at a position below the upper plate 53.

[0035] <Lower Arm>

[0036] The lower arm 6 is a plate-shaped frame attached to the first side frame 41 of the seat cushion frame 4 .

[0037] Furthermore, the lower arm 6 is connected to the lower end of the third side frame 51 of the backrest frame 5 via the reclining angle adjuster 7. Specifically, the third side frame 51 is connected to the seat cushion frame 4 via the lower arm 6. The lower arm 6 is positioned further outward in the seat width direction than the first side frame 41 and the third side frame 51. The features of the lower arm 6 will be described below.

[0038] <Tilt angle adjuster>

[0039] The reclining angle adjuster 7 is connected to the third side frame 51 of the back frame 5 and is also connected to the lower arm 6 .

[0040] The reclining angle adjuster 7 is a well-known device configured to swing the backrest frame 5 in the front-rear direction of the seat relative to the lower arm 6 and the seat cushion frame 4. The reclining angle adjuster 7 swings the backrest frame 5 around a rotation center axis parallel to the seat width direction. Figure 2 As shown, the tilt angle adjuster 7 includes a tilt angle adjuster body 71 , an operating pin 72 , and a return spring 73 .

[0041] The reclining angle adjuster body 71 includes a first engaging portion 71A, a second engaging portion 71B, and a third engaging portion 71C. The first engaging portion 71A, the second engaging portion 71B, and the third engaging portion 71C are each protruding outward in the seat width direction and are inserted into one of the first opening 614, the second opening 615, and the third opening 616 provided in the lower arm 6. The first engaging portion 71A, the second engaging portion 71B, and the third engaging portion 71C are each joined to the lower arm 6 by welding.

[0042] The tilt angle adjuster body 71 includes a locking mechanism that switches whether or not to restrict (i.e., lock) the swinging motion of the third side frame 51. The locking of the tilt angle adjuster body 71 is switched and controlled by the rotation of an operating pin 72. For example, the operating pin 72 is axially rotated by an operating input from an operating lever (not shown) connected to the operating pin 72.

[0043] A return spring 73 is attached to the operating pin 72 . One end of the return spring 73 is fixed to the operating pin 72 . The other end of the return spring 73 is fixed to the locking portion 66 of the lower arm 6 .

[0044] The return spring 73 urges the operating pin 72 in a direction to lock the recliner body 71. Therefore, when the operation input to the operating pin 72 is released, the operating pin 72 rotates in a direction to lock the recliner body 71.

[0045] In this embodiment, Figure 1 Components corresponding to the lower arm 6 and the reclining angle adjuster 7 are also provided between the second side frame 42 of the seat cushion frame 4 and the fourth side frame 52 of the backrest frame 5 shown.

[0046] <Features of the lower arm>

[0047] like Figure 3A as well as Figure 3B As shown, the lower arm 6 includes a tilt angle adjustment plate 61 , a shock absorbing hole 62 , a bent portion 63 , a first rib 64 , a second rib 65 , and a locking portion 66 .

[0048] (Tilt angle adjustment plate)

[0049] The reclining plate 61 is a flat plate-shaped portion to which the reclining adjuster 7 is fixed. The reclining plate 61 is arranged so as to overlap the reclining adjuster body 71 from the outer side in the seat width direction.

[0050] The thickness direction of the reclining angle adjustment plate 61 is parallel to the seat width direction. The reclining angle adjustment plate 61 has a first fixing portion 611 , a second fixing portion 612 , an insertion hole 613 , a first opening 614 , a second opening 615 , and a third opening 616 .

[0051] The first fixing portion 611 and the second fixing portion 612 are provided for the first bolt 81 and the second bolt 82 (see Figure 2 ) is inserted through the hole. The first bolt 81 and the second bolt 82 fasten the reclining angle adjustment plate 61 and the first side frame 41. That is, the reclining angle adjustment plate 61 is fixed to the seat cushion frame 4 at the first fixing portion 611 and the second fixing portion 612.

[0052] The first fixing portion 611 is located below the second fixing portion 612 and further to the rear of the seat. The first fixing portion 611 is located below the impact absorbing hole 62 , the bent portion 63 , and the first rib 64 .

[0053] The insertion hole 613 is arranged at a position surrounded by the first opening 614 , the second opening 615 , and the third opening 616 . The insertion hole 613 overlaps with the reclining angle adjuster 7 in the seat width direction. The operation pin 72 is inserted through the insertion hole 613 .

[0054] The first engaging portion 71A of the tilt angle adjuster body 71 is inserted into and engaged with the first opening 614. The second engaging portion 71B of the tilt angle adjuster body 71 is inserted into and engaged with the second opening 615. The third engaging portion 71C of the tilt angle adjuster body 71 is inserted into and engaged with the third opening 616.

[0055] The first opening 614 is located further forward of the seat than the insertion hole 613 and is located furthest forward of the seat among the three openings 614, 615, and 616. The second opening 615 is located below the insertion hole 613. The third opening 616 is located further rearward of the seat than the insertion hole 613 and is located furthest rearward of the seat among the three openings 614, 615, and 616.

[0056] (Shock absorbing hole)

[0057] The impact absorbing hole 62 is an opening provided in a region of the tilt angle adjustment plate 61 below the insertion hole 613 and the second opening 615 and above the first fixing portion 611 .

[0058] like Figure 4 As shown, when viewed from a direction parallel to the rotation center axis O of the reclining angle adjuster 7 (i.e., the seat width direction), the impact absorbing hole 62 is arranged at a position sandwiched between the rotation center axis O of the reclining angle adjuster 7 and the first fixing portion 611 located at the bottom among the multiple fixing portions 611 and 612.

[0059] Arranged in order from top to bottom are the rotation center axis O of the tilt angle adjuster 7 , the second joint portion 71B of the tilt angle adjuster body 71 , the shock absorbing hole 62 , and the first bolt 81 (ie, the first fixing portion 611 ).

[0060] Shock-absorbing hole 62 has a first edge 62A, a second edge 62B, an upper protrusion 62C, and a lower protrusion 62D. First edge 62A is connected to curved portion 63. First edge 62A forms the rear edge of shock-absorbing hole 62. Second edge 62B is connected to first rib 64. Second edge 62B forms the front edge of shock-absorbing hole 62.

[0061] The upper protrusion 62C is a space located above the first edge 62A and the second edge 62B. A portion of the upper protrusion 62C is vertically opposed to the second rib 65. The lower protrusion 62D is a space located below the first edge 62A and the second edge 62B. The lower protrusion 62D is vertically opposed to the first fixing portion 611.

[0062] The impact absorbing hole 62 has a shape in which the width of the impact absorbing hole 62 in the seat longitudinal direction decreases downward. Specifically, the impact absorbing hole 62 has a wedge shape in which the distance between the first edge 62A and the second edge 62B in the seat longitudinal direction decreases downward.

[0063] (Bend)

[0064] The curved portion 63 is provided continuously with the impact-absorbing hole 62 at a position further rearward of the seat than the impact-absorbing hole 62. Specifically, the curved portion 63 extends from the first edge 62A of the impact-absorbing hole 62 to the rear end of the reclining angle adjustment plate 61. The curved portion 63 is located above the first fixing portion 611.

[0065] like Figure 3A as well as Figure 3B As shown, the bent portion 63 is bent in the thickness direction of the reclining angle adjustment plate 61 so as to deform starting from the impact absorbing hole 62. Specifically, the bent portion 63 protrudes outward in the seat width direction (i.e., to the left) and is bent so as to be compressively deformable in the vertical direction. Figure 4As shown, a center line L1 of the bend of the bent portion 63 intersects the up-down direction and extends so as to connect the impact absorbing hole 62 and the rear end of the inclination angle adjusting plate 61 .

[0066] (1st rib)

[0067] The first rib 64 is a protruding portion extending from the impact-absorbing hole 62 toward the front of the seat, relative to the impact-absorbing hole 62. Specifically, the first rib 64 extends from the second edge 62B of the impact-absorbing hole 62 toward the front of the seat to a position between the first fixing portion 611 and the second fixing portion 612. The first rib 64 is located below the first joining portion 71A and the second joining portion 71B.

[0068] The first rib 64 protrudes in the thickness direction of the reclining angle adjustment plate 61. The protruding direction of the first rib 64 is outward in the seat width direction and is the same as the protruding direction of the curved portion 63. Like the curved portion 63, the first rib 64 is also curved to be compressively deformable in the vertical direction.

[0069] The longitudinal direction (i.e., center line L2) of the first rib 64 intersects the vertical direction. When viewed from a direction parallel to the rotation center axis O of the tilt angle adjuster 7, the longitudinal direction of the first rib 64 is parallel to the center line L1 of the bend 63.

[0070] like Figure 3B As shown, the width W2 of the first rib 64 in the thickness direction of the reclining angle adjustment plate 61 is greater than the width W1 of the bent portion 63 in the thickness direction of the reclining angle adjustment plate 61. Furthermore, the "width in the thickness direction of the reclining angle adjustment plate 61" refers to the difference in distance between the most protruding portion and the most recessed portion of the reclining angle adjustment plate 61 in the thickness direction (i.e., the seat width direction).

[0071] like Figure 4 As shown, the end portion of the first rib 64 in front of the seat is located further forward of the seat than the first joint portion 71A, the second joint portion 71B, and the third joint portion 71C that join the reclining angle adjuster 7 and the reclining angle adjustment plate 61 .

[0072] However, the first rib 64 does not reach the end of the reclining angle adjustment plate 61. The end of the first rib 64 located in front of the seat is located inside the reclining angle adjustment plate 61. The length of the first rib 64 along the center line L2 is greater than the length of the curved portion 63 along the curved center line L1.

[0073] (Second rib)

[0074] The second rib 65 is a protruding portion extending from the rear end portion of the tilt angle adjustment plate 61 toward the interior of the tilt angle adjustment plate 61 above the bent portion 63. The second rib 65 is located below the second joint portion 71B and the third joint portion 71C.

[0075] The second rib 65 protrudes in the thickness direction of the reclining angle adjustment plate 61. The second rib 65 protrudes outward in the seat width direction and in the same direction as the first rib 64. The second rib 65 is curved to be compressively deformable in the vertical direction.

[0076] The longitudinal direction of the second rib 65 (ie, the center line L3 ) intersects the vertical direction. When viewed from a direction parallel to the rotation axis O of the tilt angle adjuster 7 , the longitudinal direction of the second rib 65 intersects the longitudinal direction of the first rib 64 .

[0077] The second rib 65 has a shape such that its width increases and its depth (i.e., the amount of recess) increases as it approaches the rear end of the tilt angle adjustment plate 61 from the interior of the tilt angle adjustment plate 61 (i.e., toward the rear). When viewed in the thickness direction of the tilt angle adjustment plate 61, the second rib 65 has a triangular shape, with its apex located within the tilt angle adjustment plate 61 and its base formed by the rear end of the tilt angle adjustment plate 61.

[0078] The front end of the second rib 65 (i.e., the end located inside the reclining angle adjustment plate 61) is located above the impact absorbing hole 62. Furthermore, the front end of the second rib 65 is located further back in the seat than the first rib 64. In other words, the second rib 65 does not overlap with the first rib 64 in the vertical direction.

[0079] (Locking part)

[0080] The locking portion 66 protrudes outward in the seat width direction from the upper end portion of the reclining angle adjustment plate 61 . A return spring 73 is attached to the locking portion 66 .

[0081] [1-2. Effect]

[0082] According to the embodiment described in detail above, the following effects can be obtained.

[0083] (1a) The impact-absorbing hole 62 is arranged on the path where the load is transmitted from the reclining angle adjuster 7 to the seat cushion frame 4, to which torque is input. Therefore, strain that absorbs energy can be induced in the lower arm 6 near the impact-absorbing hole 62. This reduces the torque applied to the reclining angle adjuster 7.

[0084] As a result, damage to the reclining angle adjuster 7 is suppressed, and deformation of the seat cushion frame 4 is suppressed. Furthermore, the impact-absorbing holes 62 absorb strain generated when the reclining angle adjuster 7 and the backrest frame 5 are joined. Therefore, damage to the joint between the reclining angle adjuster 7 and the backrest frame 5 when torque is input to the reclining angle adjuster 7 is suppressed.

[0085] (1b) When torque is input to the reclining angle adjuster 7, the bent portion 63 can be actively deformed to absorb energy. Furthermore, the strain of the lower arm 6 can be propagated toward the front of the seat via the first rib 64. This facilitates the effect of reducing torque in the reclining angle adjuster 7. Furthermore, the first rib 64 suppresses bending of the lower arm 6 in the thickness direction.

[0086] (1c) The width of the first rib 64 in the thickness direction of the tilt angle adjustment plate 61 is greater than the width of the bent portion 63 in the thickness direction of the tilt angle adjustment plate 61. This allows the bent portion 63 to deform preferentially over the first rib 64. This facilitates the reduction of torque in the tilt angle adjuster 7.

[0087] (1d) The end portion of the first rib 64 in front of the seat is located closer to the front of the seat than the first joint 71A, the second joint 71B, and the third joint 71C. This can suppress the propagation of strain to the first joint 71A, the second joint 71B, and the third joint 71C, thereby suppressing damage to the first joint 71A, the second joint 71B, and the third joint 71C.

[0088] (1e) When a load is input to the lower arm 6 , the second rib 65 is deformed, thereby enhancing the energy absorption function of the lower arm 6 .

[0089] (1f) The longitudinal direction of the first rib 64 intersects the longitudinal direction of the second rib 65, whereby the second rib 65 generates a reaction force that resists the energy absorption of the first rib 64. Therefore, damage to the lower arm 6 can be suppressed.

[0090] (1g) The impact absorbing hole 62 has an upper protrusion 62C located above the first edge 62A and the second edge 62B, and a lower protrusion 62D located below the first edge 62A and the second edge 62B, thereby promoting the propagation of strain from the impact absorbing hole 62 to the curved portion 63 and the first rib 64.

[0091] (1h) The shock absorbing hole 62 has a shape in which the width decreases downward, thereby improving the energy absorption efficiency near the shock absorbing hole 62 .

[0092] [2. Other Implementations]

[0093] As mentioned above, although embodiment of this disclosure was described, this disclosure is not limited to the said embodiment, Various embodiments can be adopted.

[0094] (2a) In the vehicle seat of the above embodiment, the width of the first rib in the thickness direction of the reclining plate may be equal to or less than the width of the curved portion in the thickness direction of the reclining plate. Furthermore, the end of the first rib located at the front of the seat may be located further back than the junction between the reclining adjuster and the reclining plate.

[0095] (2b) In the vehicle seat of the above embodiment, the longitudinal direction of the first rib may be parallel to the longitudinal direction of the second rib when viewed from a direction parallel to the rotation center axis of the reclining angle adjuster.

[0096] (2c) In the vehicle seat of the above embodiment, the impact absorbing hole may not have the upper protrusion and the lower protrusion. In addition, the impact absorbing hole may not have a shape in which the width decreases downward.

[0097] (2d) In the vehicle seat of the above embodiment, the curved portion, the first rib, and the second rib may project inward in the seat width direction (i.e., toward the side where the reclining angle adjuster is located). Furthermore, the curved portion, the first rib, and the second rib may project in different directions.

[0098] (2e) The vehicle seat of the above embodiment can also be used as a seat for use in automobiles other than passenger cars, or a seat for use in vehicles other than automobiles, such as railway vehicles, ships, and aircraft.

[0099] (2f) The functions of one constituent element in the above-mentioned embodiment may be shared by a plurality of constituent elements, or the functions of a plurality of constituent elements may be integrated into a single constituent element. In addition, a portion of the configuration of the above-mentioned embodiment may be omitted. In addition, at least a portion of the configuration of the above-mentioned embodiment may be added to the configuration of the above-mentioned other embodiment, or at least a portion of the configuration of the above-mentioned embodiment may be replaced with the configuration of the above-mentioned other embodiment, etc. In addition, all the modes included in the technical ideas determined by the sentences recorded in the claims are embodiments of the present disclosure.

Claims

1. A seat for a vehicle, characterized in that have: seat cushions; a seat backrest capable of swinging relative to the seat cushion in a seat front-rear direction; a cushion frame, the cushion frame supporting the seat cushion; a backrest frame supporting the seat back; a lower arm, the lower arm being mounted on the seat cushion frame; as well as A reclining angle adjuster is connected to the backrest frame and the lower arm, and is configured to swing the backrest frame relative to the lower arm in the seat front-rear direction, and The lower arm has a plate-shaped tilt angle adjustment plate and a shock absorbing hole. The tilt angle adjuster is fixed to the tilt angle adjustment plate, and the tilt angle adjustment plate is fixed to the seat cushion frame at a plurality of fixing portions. The impact absorbing hole is provided on the tilt angle adjustment plate, When viewed from a direction parallel to the rotation center axis of the tilt angle adjuster, the impact absorbing hole is arranged at a position sandwiched between the rotation center axis of the tilt angle adjuster and the fixing portion located at the bottom of the plurality of fixing portions. The lower arm also has a bent portion and a first rib, The bent portion is provided continuously with the impact absorbing hole at a position further rearward of the seat than the impact absorbing hole, and is bent in the thickness direction of the reclining angle adjustment plate so as to deform with the impact absorbing hole as a starting point. The first rib extends from the impact absorbing hole at a position closer to the front of the seat than the impact absorbing hole, and the first rib protrudes in the thickness direction of the reclining angle adjustment plate. The bent portion and the first rib are compressibly deformable in the vertical direction.

2. The vehicle seat according to claim 1, wherein: The width of the first rib in the thickness direction of the tilt angle adjustment plate is greater than the width of the bent portion in the thickness direction of the tilt angle adjustment plate.

3. The vehicle seat according to claim 1 or 2, wherein: The end portion of the first rib located in front of the seat is located closer to the front of the seat than a joint portion between the reclining angle adjuster and the reclining angle adjustment plate.

4. The vehicle seat according to claim 1, wherein: The lower arm further includes a second rib extending from an end portion of the tilt angle adjustment plate toward an interior of the tilt angle adjustment plate above the bent portion, and the second rib protrudes in a thickness direction of the tilt angle adjustment plate.

5. The vehicle seat according to claim 4, wherein: When viewed from a direction parallel to a rotational center axis of the tilt angle adjuster, a longitudinal direction of the first rib intersects with a longitudinal direction of the second rib.

6. The vehicle seat according to claim 1, wherein: The impact absorbing hole has a first edge, a second edge, an upper protrusion, and a lower protrusion. The first edge is connected to the curved portion, The second edge is connected to the first rib, The upper protrusion is located above the first edge and the second edge. The downward protrusion is located below the first edge and the second edge.

7. The vehicle seat according to claim 1, wherein: The shock-absorbing hole has a shape in which the width decreases downward.

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