Vehicle seat

Abstract

To obtain a vehicle seat capable of suppressing an increase in cost with a simple structure and suppressing a back deviation of a seated person.SOLUTION: A vehicle seat 10 includes: a seat cushion frame 16; a seat back frame 26; and a connecting part 34 as a hinge mechanism. The seat cushion frame 16 and the seat back frame 26 are connected at the connecting part 34, and the connecting part 34 can absorb a relative positional deviation in a seat up and down direction that occurs between a rotation center of a seated occupant and a rotation center of the seat back frame 26 following a reclining movement of a seat back 14, and can suppress a back deviation. Therefore, for example, compared to a case where a front connecting mechanism and a rear connecting mechanism are provided between the seat cushion frame and a vehicle body, a number of parts can be reduced, and the number of work steps can be reduced accordingly, making it possible to suppress an increase in costs.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] The vehicle seat described in Patent Document 1 below discloses technology that reduces the misalignment of the relative positions (so-called back shift) between the occupant and the seat back in the vertical direction of the seat that occurs when the seat back is reclined.

[0003] In this prior art, the seat cushion frame is attached to the vehicle body via a front connecting mechanism and a rear connecting mechanism. The front connecting mechanism is configured so that the front link can move along a front guide gear of a front bracket, and the front link moves on an arc centered on a virtual center point set above the vehicle of the seat cushion. Meanwhile, the rear connecting mechanism is configured so that the rear link can move along a rear guide gear of a rear gear bracket, and the rear link moves on an arc centered on the virtual center point.

[0004] In this prior art, when the seat back is reclined, the front link and the rear link move toward the front of the vehicle along an arc centered on the virtual center point, the seat cushion frame is displaced so as to incline toward the lower side of the vehicle as it moves toward the rear of the vehicle, and the seat back frame connected to the rear end of the seat cushion frame is tilted toward the rear of the vehicle. At this time, the occupant reclines about the virtual center point in the same way as the vehicle seat, so that the center of rotation of the vehicle seat when reclining and the center of rotation of the occupant coincide with each other, and the back of the seated occupant is prevented from slipping away from the seat back. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-19441 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned Patent Document 1, a front connecting mechanism and a rear connecting mechanism are provided between the seat cushion frame and the vehicle body, which increases the number of parts, and therefore the number of work steps increases, resulting in increased costs.

[0007] In consideration of the above, an object of the present invention is to provide a vehicle seat that has a simple structure, prevents costs from increasing, and prevents the back of the seated occupant from shifting. [Means for solving the problem]

[0008] The vehicle seat of the first aspect includes a seat cushion frame that forms a skeletal member of a seat cushion on which an occupant sits, a seat back frame that forms a skeletal member of a seat back that is connected to the seat cushion frame via a connecting portion and supports the upper body of the seated occupant seated on the seat cushion, and is supported on the seat cushion frame so as to be reclined around an axis portion that is provided along the seat width direction, and a hinge mechanism that is provided on the connecting portion and is capable of absorbing relative positional misalignment in the vertical direction of the seat that occurs between the seated occupant and the seat back when the seat back is reclined.

[0009] The vehicle seat according to the first aspect includes a seat cushion frame, a seat back frame, and a hinge mechanism. The seat cushion frame constitutes a skeletal member of the seat cushion, and the seat back frame is connected to the seat cushion frame via a connecting portion and constitutes a skeletal member of the seat back. The seat back frame is supported so as to be reclined about an axis portion provided along the seat width direction relative to the seat cushion frame.

[0010] On the other hand, the hinge mechanism is provided at the connecting portion, and the connecting portion is capable of absorbing the relative positional shift in the vertical direction of the seat that occurs between the seated occupant and the seat back when the seat back is reclined. As a result, in this aspect, so-called back slippage can be suppressed.

[0011] As described above, in this embodiment, the hinge mechanism provided at the connection between the seat cushion frame and the seat back frame can prevent the back from slipping, so that the number of parts can be reduced compared to, for example, the prior art where a front connecting mechanism and a rear connecting mechanism are provided between the seat cushion frame and the vehicle body to prevent the back from slipping.

[0012] It should be noted that "absorbing the positional deviation" here means that the positional deviation can at least be reduced, and does not necessarily mean that the positional deviation is completely eliminated.

[0013] The vehicle seat of the second aspect is the vehicle seat of the first aspect, wherein the hinge mechanism includes a sector gear formed along the shape of a long hole provided in an arc shape with a virtual HP position corresponding to the hip point of the seated occupant as the center of rotation at the lower end in the seat vertical direction of a back side frame constituting a side portion of the seatback frame when the seatback is upright, and a pinion gear forming the shaft portion, meshing with the sector gear and rotating along with the reclining movement of the seatback.

[0014] In the vehicle seat according to the second aspect, the hinge mechanism includes a sector gear and a pinion gear. The sector gear is provided at the lower end in the seat vertical direction of a back side frame that constitutes a side portion of the seat back frame. An arc-shaped long hole is formed at the lower end of the back side frame with the rotation center being a (virtual) HP position that corresponds to the hip point of a seated occupant when the seat back is upright.

[0015] The sector gear is formed along the shape of the long hole. That is, in this embodiment, the sector gear is formed in the long hole formed in the back side frame, and is provided inside the outer edge of the back side frame. Therefore, in this embodiment, the hinge mechanism can be made more compact than in a comparative example in which the sector gear is provided on the outer edge (outside) of the back side frame.

[0016] On the other hand, the pinion gear forms the shaft of the seat back frame and rotates with the reclining movement of the seat back. Since the sector gear meshes with the pinion gear, when the seat back is reclined, the sector gear moves as the pinion gear rotates, changing the meshing position between the pinion gear and the sector gear.

[0017] The meshing position between the pinion gear and the sector gear moves upward at the lower end of the back side frame in response to the reclining movement of the seat back. In other words, the lower end of the back side frame moves downward and forward of the seat along the shape of the elongated hole in which the sector gear is formed.

[0018] In this manner, in this aspect, by moving the lower end of the seatback frame toward the lower side of the seat and toward the front side of the seat in response to the reclining movement of the seatback, it is possible to absorb the relative positional misalignment in the vertical direction of the seat that occurs between the seated occupant and the seatback when the seatback is reclined.

[0019] The vehicle seat according to the third aspect is the vehicle seat according to the second aspect, wherein the hinge mechanism further includes a guide hole provided on the back side frame above the sector gear in the seat vertical direction, the guide hole being formed in an arc shape at a position spaced apart from the sector gear with the HP position as the center of rotation, and a guide pin provided on a cushion side frame constituting a side portion of the seat cushion frame and engaged with the guide hole.

[0020] In the vehicle seat according to the third aspect, the hinge mechanism further includes a guide hole and a guide pin. The guide hole is provided above the sector gear in the seat vertical direction in the back side frame, and is formed in an arc shape at a position spaced apart from the sector gear with the head pad of the seated occupant as the rotation center.

[0021] On the other hand, the guide pin is provided on a cushion side frame that constitutes a side portion of the seat cushion frame, and is engaged with the guide hole. The guide hole is formed in an arc shape with the HP position as the center of rotation, similar to the sector gear, so that the guide hole moves in the same manner as the sector gear, with the guide pin engaged with the guide hole as a reference, following the reclining movement of the seat back.

[0022] As a result, in this embodiment, the guide pin prevents the seat back, which can rotate around the shaft portion of the pinion gear that meshes with the sector gear, from rotating toward the rear of the seat when a seated occupant leans back against the seat back.

[0023] The vehicle seat of the fourth aspect is the vehicle seat of the second or third aspect, in which a cover plate is provided on the outer side of the sector gear in the seat width direction to maintain the meshing state between the sector gear and the pinion gear.

[0024] In the vehicle seat according to the fourth aspect, a cover plate is provided on the outer side of the sector gear in the seat width direction. This cover plate maintains the meshing state between the sector gear and the pinion gear. For example, an external force may be applied to the upper end of the seat back when a passenger sitting in the back seat presses the seat forward. In this case, if the meshing state between the sector gear and the pinion gear is released, problems such as the inability to recline the seat back may occur.

[0025] For this reason, in this embodiment, a cover plate is provided on the outer side of the sector gear in the seat width direction so that the sector gear and the pinion gear are kept in mesh with each other. This makes it possible to prevent the sector gear and the pinion gear from being disengaged from each other even if an external force toward the front of the seat is applied to the upper end of the seat back.

[0026] A vehicle seat according to a fifth aspect is a vehicle seat according to any one of the second to fourth aspects, in which the back side frame is divided into an upper frame and a lower frame in the vertical direction of the seat, and the sector gear and the guide hole are formed in the lower frame.

[0027] In the vehicle seat according to the fifth aspect, the back side frame is divided into an upper frame and a lower frame in the seat vertical direction. Since the sector gear and the guide hole are formed in the lower frame, only the lower frame can be changed according to the vehicle model. Effect of the Invention

[0028] As described above, the vehicle seat according to the present invention has a simple configuration, which can suppress an increase in costs and can prevent the back of the seated occupant from shifting. [Brief description of the drawings]

[0029] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention, as viewed from a diagonally front right side. [Diagram 2] 1 is an exploded perspective view of a vehicle seat according to an embodiment of the present invention, as viewed from a diagonally front right side; [Diagram 3] 2 is an end view of the main part showing the main part when cut along the line AA shown in FIG. [Figure 4] 1A is an enlarged perspective view of a vehicle seat according to an embodiment of the present invention in an upright state, and FIG. 1B is an enlarged perspective view of a vehicle seat according to an embodiment of the present invention in an upright state, and FIG. 1B is an enlarged perspective view of a vehicle seat according to an embodiment of the present invention in an upright state. [Diagram 5]1A is an enlarged perspective view of a vehicle seat according to an embodiment of the present invention in a reclined position, and FIG. 1B is an enlarged perspective view of a vehicle seat according to an embodiment of the present invention in a reclined position. FIG. [Figure 6] 1 is a left side view showing a vehicle seat according to an embodiment of the present invention in an upright state. [Figure 7] 1 is a left side view showing a vehicle seat according to an embodiment of the present invention in a reclined state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, a vehicle seat according to an embodiment of the present invention will be described with reference to the drawings. Note that the arrow FR shown as appropriate in the following drawings indicates the forward direction in the seat front-rear direction (the direction in which the seated person faces), the arrow UP indicates the upward direction in the seat vertical direction, and the arrow RH indicates the rightward direction in the seat width direction. Hereinafter, when the directions of front-rear, up-down, and left-right are used in the description, they refer to the front-rear direction in the seat front-rear direction, the up-down direction in the seat vertical direction, and the left-right direction in the seat width direction when facing the traveling direction of the vehicle, unless otherwise specified.

[0031] (Vehicle seat configuration) First, the configuration of the vehicle seat according to this embodiment will be described.

[0032] As shown in Figures 1 and 2, a vehicle seat 10 in this embodiment includes a seat cushion 12 for an occupant to sit on, a seat back 14 that supports the upper body of the seated occupant seated on the seat cushion 12, and a headrest (not shown) that supports the head of the seated occupant.

[0033] The seat cushion 12 includes a seat cushion frame 16 that constitutes a framework of the seat cushion 12, and the seat cushion frame 16 has a generally rectangular frame shape in a plan view. The seat cushion frame 16 includes left and right cushion side frames 18, 20 that are arranged along the front-rear direction of the seat on the outer sides of the seat width direction of the seat cushion frame 16, a front pipe 22 that spans between the front end of the cushion side frame 18 and the front end of the cushion side frame 20, and a rear pipe 24 that spans between the rear end of the cushion side frame 18 and the rear end of the cushion side frame 20.

[0034] On the other hand, the seat back 14 is configured to include a seat back frame 26 that forms a framework member of the seat back 14, and the seat back frame 26 is generally in an inverted U shape with an opening on the lower side. The seat back frame 26 is configured to include left and right back side frames 28, 30 that are arranged along the seat up-down direction on the outer sides of the seat back frame 26 in the seat width direction, and an upper pipe 32 that spans between the upper ends of the back side frames 28 and 30.

[0035] The lower ends of the back side frames 28, 30 are connected to the rear ends of the cushion side frames 18, 20 respectively via connecting parts (hinge mechanisms) 34, and the seat back 14 is capable of rotating in the fore-and-aft direction of the vehicle relative to the seat cushion 12 around the connecting parts 34, thereby enabling the seat back 14 to be reclined.

[0036] A reclining motor 36 is provided on the cushion side frame 18 side and is capable of rotating in both forward and reverse directions. The motor 36 is driven to rotate the seat back 14 about the connecting portion 34 (to enable reclining). The motor 36 is provided with a gear box 38, and although not shown, the rotation of an output shaft 40 is reduced by a plurality of gears constituting the gear box 38. A pinion gear (hinge mechanism, connecting portion) 42 is connected to the output shaft 40, and the driving force of the motor 36 can be transmitted to the pinion gear 42.

[0037] As shown in Fig. 3, the shaft portion 42A of the pinion gear 42 penetrates the cushion side frame 18. As shown in Fig. 1, a gear connecting shaft 44 is bridged between the cushion side frame 18 and the cushion side frame 20, and the shaft portion 42A of the pinion gear 42 is fitted into one end portion of the gear connecting shaft 44. Note that Fig. 3 is an end view of the main parts excluding the motor 36 when cut along the line AA shown in Fig. 1.

[0038] As shown in FIG. 2, a pinion gear 42 is also provided on the cushion side frame 20 side, and a shaft portion 42 A of the pinion gear 42 passes through the cushion side frame 20 and is fitted onto the other end of the gear connecting shaft 44 .

[0039] In this manner, the left and right pinion gears 42 are synchronized by connecting the left and right pinion gears 42 via the gear connecting shaft 44. A motor 48 for a lifter is provided on the cushion side frame 20 side. This motor 48 is capable of rotating in both forward and reverse directions, and the seat cushion 12 can be raised and lowered via the rear pipe 24 by driving the motor 48.

[0040] In this embodiment, the back side frames 28, 30 are divided into upper and lower halves, respectively, of an upper frame 50 and a sector gear bracket (lower frame) 52. Since the back side frames 28 and 30 have substantially the same configuration, the same reference numerals are used for the left and right frames when there is no need to distinguish between the left and right frames, and in the following explanation, the back side frame 28 will be explained as a representative of both frames.

[0041] The upper frame 50 and the sector gear bracket 52 are fastened and integrated via a bolt 54. A sector gear (hinge mechanism, connecting portion) 56 and a guide hole (connecting portion) 58 are formed in the sector gear bracket 52. The sector gear 56 is provided on the upper side of an elongated hole 60 that is provided in an arc shape with the HP position P (see FIG. 6) corresponding to the hip point of a seated occupant of a standard Japanese build as the center of rotation when the seat back 14 is upright, for example, and is formed along the shape of the elongated hole 60, and the pinion gear 42 is meshed with the sector gear 56. Note that in this embodiment, the sector gear 56 is provided on the upper side of the elongated hole 60, but it may be provided on the lower side of the elongated hole 60.

[0042] On the other hand, the guide hole 58 is provided above the sector gear 56 and is formed in an arc shape at a position spaced apart from the sector gear 56 with the HP position P (see FIG. 6) as the center of rotation. Here, guide pins (connecting parts) 62 protrude outward in the seat width direction from the rear ends of the cushion side frames 18, 20 along the seat width direction. The guide pins 62 are engageable with the guide holes 58.

[0043] The guide hole 58 and the sector gear 56 are formed so that the stroke of the guide hole 58 moving with the guide pin 62 as the reference and the stroke of the sector gear 56 moving with the pinion gear 42 as the reference are substantially the same.

[0044] Here, when the motor 36 shown in Figures 4(A) and 5(A) is driven, the pinion gear 42 rotates. As a result, as shown in Figures 5(A) and (B), the sector gear 56 meshing with the pinion gear 42 moves along the shape of the long hole portion 60 with the pinion gear 42 as a reference. At this time, the guide hole 58 moves along the shape of the guide pin 62 with the guide pin 62 as a reference. As a result, the seat back 14 rotates in the seat front-rear direction as shown in Figure 7.

[0045] 2 and 3, on the other hand, in this embodiment, a cover plate 64 is attached to the outer side of the sector gear bracket 52 in the seat width direction via a bolt 66. In other words, the sector gear bracket 52 and the pinion gear 42 are disposed between the cover plate 64 and the cushion side frame 18.

[0046] (Function and Effects of Vehicle Seats) Next, the operation and effects of the vehicle seat according to this embodiment will be described.

[0047] 2, in this embodiment, the vehicle seat 10 includes a seat cushion frame 16, a seat back frame 26, and a connecting portion 34 provided with a hinge mechanism. The seat cushion frame 16 and the seat back frame 26 are connected to each other at the connecting portion 34.

[0048] In this embodiment, the connecting portion 34 can absorb the relative positional shift in the up-down direction of the seat that occurs between the seated occupant and the seat back 14 when the seat back 14 is reclined. As a result, in this embodiment, so-called back shifting can be suppressed.

[0049] As described above, in this embodiment, the connection portion 34 between the seat cushion frame 16 and the seatback frame 26 can prevent the back from slipping. Therefore, for example, although not shown, in comparison with the case of the background art in which a front connecting mechanism and a rear connecting mechanism are provided between the seat cushion frame and the vehicle body to prevent the back from slipping, this embodiment can reduce the number of parts. As a result, this embodiment can reduce the number of work steps and prevent costs from increasing.

[0050] Here, the connecting portion 34 provided with the hinge mechanism will be specifically described. As shown in FIG. 2, in this embodiment, the connecting portion 34 includes a sector gear 56 and a pinion gear 42.

[0051] The sector gear 56 is provided on the lower end portion (sector gear bracket 52) ​​of each of the back side frames 28, 30 that constitute the side portions of the seat back frame 26. The sector gear bracket 52 is formed with an arc-shaped elongated hole portion 60 that rotates around the HP position P of the seated occupant when the seat back 14 is in an upright position. The sector gear 56 is formed along the shape of the elongated hole portion 60.

[0052] That is, the sector gear 56 is formed in the long hole portion 60 formed in the sector gear bracket 52 of the back side frames 28, 30, respectively, and is therefore provided inside the outer edge of the sector gear bracket 52. For this reason, for example, although not shown, as a comparative example, the coupling portion 34 can be made more compact compared to a case in which the sector gear 56 is provided on the outer edge (outside) of the sector gear bracket 52.

[0053] On the other hand, the pinion gear 42 forms part of the shaft (gear connecting shaft 44) of the seatback frame 26, and when the motor 36 shown in Figures 4(A) and 5(A) is driven, the pinion gear 42 rotates together with the reclining movement of the seatback 14. Since the sector gear 56 is meshed with the pinion gear 42, when the seatback 14 is reclined, the sector gear 56 moves together with the rotation of the pinion gear 42. This changes the meshing position of the pinion gear 42 and the sector gear 56.

[0054] The meshing position of the pinion gear 42 and the sector gear 56 moves upward in the sector gear bracket 52 of the back side frames 28, 30 in response to the reclining movement of the seat back 14. In other words, the back side frames 28, 30 move downward and forward of the seat along the shape of the elongated hole portion 60 in which the sector gear 56 is formed.

[0055] In this manner, in this embodiment, by moving the back side frames 28, 30 toward the lower side and the front side of the seat in response to the reclining movement of the seat back 14, it is possible to absorb the relative positional misalignment in the up-down direction of the seat that occurs between the seated occupant and the seat back 14 when the seat back 14 is reclined.

[0056] In this embodiment, as shown in FIG. 6, the sector gear 56 and the guide hole 58 are provided with the seat back 14 in an upright position, with the HP position P of a seated occupant of standard Japanese build as the center of rotation. However, the position P serving as the center of rotation does not necessarily have to be the HP position, as long as it is near the HP position of the seated occupant.

[0057] In the present embodiment, the connecting portion 34 of the vehicle seat 10 further includes a guide hole 58 and a guide pin 62. The guide hole 58 is provided above the sector gear 56 in the back side frames 28, 30, and is formed in an arc shape at a position spaced apart from the sector gear 56 with the HP position P of the seated occupant as the rotation center.

[0058] 4(A) and (B), the guide pin 62 is provided on each of the cushion side frames 18 and 20, and is engaged with a guide hole 58 formed in each of the back side frames 28 and 30. The guide hole 58 is formed in an arc shape with the HP position P (see FIG. 6) as the center of rotation, similar to the sector gear 56. Therefore, in response to the reclining movement of the seat back 14, the guide hole 58 moves in the same manner as the sector gear 56, with the guide pin 62 engaged with the guide hole 58 as a reference.

[0059] The guide hole 58 is formed in an arc shape at a position spaced apart from the sector gear 56 with the HP position P of the seated occupant as the rotation center, and the guide hole 58 is formed on the seat rear side of the sector gear 56. Therefore, with respect to the seat back 14 which can rotate around the shaft portion 42A of the pinion gear 42 which meshes with the sector gear 56, the guide pin 62 engaged in the guide hole 58 suppresses the rotation of the seat back 14 towards the seat rear side when the seated occupant leans back against the seat back 14.

[0060] In this embodiment, as shown in Fig. 3, a cover plate 64 is provided on the outer side of the sector gear 56 in the seat width direction. This cover plate 64 maintains the meshed state between the sector gear 56 and the pinion gear 42. For example, as shown in Fig. 6, an external force F may be applied to the upper end of the seat back 14 when a seated passenger in the rear seat presses the seat forward. At this time, if the meshed state between the sector gear 56 and the pinion gear 42 is released, problems such as the inability to recline the seat back 14 may occur.

[0061] For this reason, in this embodiment, a cover plate 64 is provided on the outer side of the sector gear 56 in the seat width direction, and is set to maintain the meshed state between the sector gear 56 and the pinion gear 42. This makes it possible to prevent the disengagement of the meshed state between the sector gear 56 and the pinion gear 42 even if an external force F toward the front side of the seat is applied to the upper end of the seat back 14. Note that the cover plate 64 is not necessarily required.

[0062] 2, in this embodiment, the back side frames 28, 30 are divided into an upper frame 50 and a sector gear bracket 52. Since the sector gear 56 and the guide hole 58 are formed in the sector gear bracket 52, it is possible to change only the sector gear bracket 52 in accordance with the vehicle model, for example by changing the arc center positions of the sector gear 56 and the guide hole 58.

[0063] This allows at least a portion of the back side frames 28, 30 to be shared, which results in reduced costs, compared to when the back side frames 28, 30 are formed to suit the vehicle model. However, it goes without saying that the upper frame 50 and the sector gear bracket 52 may be formed integrally.

[0064] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications can be made without departing from the spirit of the present invention. It goes without saying that the scope of the present invention is not limited to the above embodiment. [Explanation of symbols]

[0065] 10 Vehicle seats 12 Seat cushion 14 Seat back 16 Seat cushion frame 18 Cushion side frame 20 Cushion side frame 26 Seat back frame 28 Backside Frame 30 Backside Frame 34 Connection part (hinge mechanism) 42 Pinion gear (hinge mechanism, connecting part) 42A Shaft 44 Gear connecting shaft (shaft) 50 Upper Frame 52 Sector gear bracket (lower frame) 56 Sector gear (hinge mechanism, connecting part) 58 Guide hole (hinge mechanism) 60 Long hole part 62 Guide pin (hinge mechanism) 64 Cover Plate P HP position

Claims

1. a seat cushion frame that constitutes a framework of a seat cushion on which an occupant sits; a seat back frame that is connected to the seat cushion frame via a connecting portion and forms a framework member of a seat back that supports an upper body of a seated occupant seated on the seat cushion, and is supported on the seat cushion frame in a reclining manner around an axis portion that is provided along a seat width direction; a hinge mechanism provided at the connecting portion, capable of absorbing a relative positional deviation in a seat up-down direction that occurs between the seated occupant and the seat back when the seat back is reclined; A vehicle seat comprising:

2. The hinge mechanism includes: a sector gear formed along the shape of an elongated hole provided in an arc shape with a virtual HP position corresponding to a hip point of the seated occupant as a rotation center at a lower end portion in a seat vertical direction of a back side frame constituting a side portion of the seat back frame when the seat back is in an upright state; a pinion gear that forms the shaft portion, meshes with the sector gear, and rotates in accordance with the reclining operation of the seat back; The vehicle seat according to claim 1 , further comprising:

3. The hinge mechanism includes: a guide hole provided on the back side frame above the sector gear in the seat vertical direction, the guide hole being formed in an arc shape at a position spaced apart from the sector gear with the HP position as a rotation center; a guide pin provided on a cushion side frame constituting a side portion of the seat cushion frame and engaged with the guide hole; 3. The vehicle seat according to claim 2, further comprising:

4. 3. The vehicle seat according to claim 2, wherein a cover plate for maintaining an engagement state between the sector gear and the pinion gear is provided on an outer side of the sector gear in the seat width direction.

5. 4. The vehicle seat according to claim 3, wherein the back side frame is divided into an upper frame and a lower frame in a seat up-down direction, and the sector gear and the guide hole are formed in the lower frame.

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