Vehicle seat

Abstract

To provide a vehicle seat capable of improving the strength.SOLUTION: A link mechanism of a vehicle seat comprises: a drive link member provided with a second gear that meshes with a first gear supported by a seat cushion, and configured to pivot according to pivoting of the first gear; an elongate hole provided in the drive link member and having a shape along an arc of a circle centered on a pivoting center of the drive link member; a restriction member that is inserted into the elongate hole, that has one end supported by the seat cushion, and that restricts a pivoting range of the drive link member; and a support member supporting the other end of the restriction member and supporting a shaft of the first gear. In a direction connecting the pivoting center and the restriction member, a first distance between an edge of the elongate hole on a second gear side and the restriction member is smaller than a second distance between an edge of the elongate hole on an opposite side to the second gear side and the restriction member.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] Patent Document 1 describes a vehicle seat that includes a sector gear that is operatively connected to one of link members connected by a torque rod and has an arc-shaped long hole formed therein, a pinion gear that is rotatably supported on a lower arm and meshes with the sector gear, a pressure bracket journaled on the pinion gear, and a stopper pin that passes through the long hole in the sector gear and has one end connected to the lower arm and the other end connected to the pressure bracket.

[0003] Patent document 2 describes a vehicle seat having a pair of connecting members that connect a pair of sliders of a slide mechanism to a seat cushion frame, and a connecting member that connects the pair of connecting members to each other in the vehicle width direction so as to suppress displacement of the pair of connecting members in the direction toward each other during a rear-end collision.

[0004] Patent document 3 describes a vehicle seat that includes a height adjustment mechanism that supports the seating portion so that it can be raised and lowered, and a height brake that is fixed to the side frame and engages with the height adjustment mechanism to lock the height position of the seating portion.

[0005] Patent Document 4 describes a vehicle seat equipped with a multi-link mechanism that functions as a four-link mechanism to set the seat height.

[0006] Patent document 5 describes a structure in which a side frame is assembled to an upper rail with a gap formed between the upper rail and the side frame, and a restricting bracket having a hook portion that closes part or all of the gap is attached to the side frame, and the hook portion is set to interfere with the lower rail or upper rail in the slide mechanism when a rear-end collision occurs to the vehicle. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-87554 [Patent Document 2] Patent No. 5846391 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-112150 [Patent Document 4] Patent No. 4452711 [Patent Document 5] Patent No. 5233547 Summary of the Invention [Problem to be solved by the invention]

[0008] The technology of the present disclosure aims to provide a vehicle seat that can improve strength. [Means for solving the problem]

[0009] A vehicle seat according to one embodiment of the disclosed technology is a vehicle seat with a height adjustable seat cushion, comprising: a drive link member provided with a second gear that meshes with a first gear supported on the seat cushion and that is configured to rotate in response to rotation of the first gear; a long hole provided in the drive link member and shaped along an arc of a circle centered on the rotation center of the drive link member; a regulating member that is inserted into the long hole and supported at one end by the seat cushion, and that regulates the rotation range of the drive link member; and a support member that supports the other end of the regulating member and supports the shaft of the first gear, wherein a first distance between the edge of the long hole on the second gear side and the regulating member in the direction connecting the rotation center and the regulating member is smaller than a second distance between the edge of the long hole on the opposite side to the second gear side and the regulating member. [Effects of the Invention]

[0010] According to the technology of the present disclosure, strength can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is an external perspective view showing a schematic configuration of a vehicle seat 100 according to one embodiment of the technology of the present disclosure. [Figure 2] FIG. 2 is a partially enlarged perspective view that schematically illustrates the internal configuration of the vehicle seat 100 shown in FIG. [Figure 3] FIG. 3 is a partially enlarged perspective view that schematically shows the internal configuration of the vehicle seat 100 shown in FIG. 1, as seen from a different direction than FIG. [Figure 4] FIG. 4 is a schematic diagram of the rear end portion of the left side frame 11L as viewed from the right side. [Figure 5] FIG. 5 is a schematic cross-sectional view taken along the line AA in FIG. [Figure 6] FIG. 6 is a schematic cross-sectional view taken along the line BB in FIG. [Figure 7] FIG. 7 is a perspective view showing a schematic configuration of the fixed bracket 64 and the reinforcing plate 65. As shown in FIG. [Figure 8] FIG. 8 is an enlarged view of a main portion of the vehicle seat 100 near the rear end portion of the left rear link member 61L as viewed from the right side. DETAILED DESCRIPTION OF THE INVENTION

[0012] FIG. 1 is an external perspective view showing a schematic configuration of a vehicle seat 100 according to an embodiment of the technology of the present disclosure. Vehicles in this specification include automobiles, airplanes, trains, mobile drones, ships, and the like. In the following description, the direction in front of an occupant sitting in the vehicle seat 100 in a normal posture is referred to as the forward direction Fr, and the direction opposite to the forward direction Fr is referred to as the rearward direction Rr, collectively referred to as the front-rear direction. Furthermore, the right side of the occupant when viewed from behind is referred to as the right direction R, and the left side of the occupant is referred to as the leftward direction L, collectively referred to as the left-right direction. Furthermore, the direction perpendicular to the front-rear direction and the left-right direction, and extending from the headrest toward the seat cushion, is referred to as the downward direction D, and the direction opposite to the downward direction D is referred to as the upward direction U, collectively referred to as the up-down direction. The front-rear direction, left-right direction, and up-down direction intersect with each other.

[0013] The vehicle seat 100 includes a seat cushion 1 that supports the buttocks and thighs of an occupant, and a seat back 2 that supports the lumbar region and back of the occupant. In the example of Fig. 1, the vehicle seat 100 is a driver's seat or a passenger's seat of an automobile.

[0014] The seat cushion 1 has a cushion frame 11 (see FIGS. 2 and 3) that forms a skeleton. The cushion frame 11 is covered with a pad (not shown) made of a relatively soft resin foam material such as urethane foam, and is further covered with a trim cover (not shown) that includes a covering material such as leather, woven fabric, or nonwoven fabric.

[0015] The seat back 2 has a back frame 21 (not shown) (see FIGS. 2 and 3) that forms a skeleton. The back frame 21 is covered with a pad (not shown) made of a relatively soft resin foam material such as urethane foam, and is further covered with a trim cover (not shown) that includes a covering material such as leather, woven fabric, or nonwoven fabric.

[0016] The vehicle seat 100 is fixed to the vehicle floor F and includes a pair of rail mechanisms 3 located directly below the seat cushion 1, and a foot bracket (not shown) positioned between the rail mechanisms 3 and the vehicle floor F and supporting the seat cushion 1 from below via the rail mechanisms 3.

[0017] The rail mechanism 3 is positioned directly below the seat cushion 1 to support the seat cushion 1 and is capable of moving the seat cushion 1 in the front-rear direction. The rail mechanism 3 has two long rails that extend in the front-rear direction, specifically a lower rail 31 that serves as a fixed rail and an upper rail 32 that serves as a movable rail. The upper rail 32 is capable of sliding (moving) together with the seat cushion 1 supported on its upper surface in the longitudinal direction of the lower rail 31 (i.e., the front-rear direction).

[0018] Fig. 2 is a partially enlarged perspective view schematically showing the internal configuration of the vehicle seat 100 shown in Fig. 1. Fig. 2 shows a state in which the pad and trim cover of the seat cushion 1 and the pad and trim cover of the seat back 2 have been removed. Fig. 3 is a partially enlarged perspective view schematically showing the internal configuration of the vehicle seat 100 shown in Fig. 1, seen from a different direction than Fig. 2.

[0019] The cushion frame 11 of the seat cushion 1 includes a left side frame 11L and a right side frame 11R that are arranged side by side in the left-right direction and extend in the front-rear direction. In the example of Figures 2 and 3, the left side frame 11L and the right side frame 11R are each a plate-like frame that is thick in the left-right direction.

[0020] The back frame 21 of the seat back 2 includes a left side frame 21L and a right side frame 21R that are arranged side by side in the left-right direction and extend in the up-down direction. In the example of Figures 2 and 3, the left side frame 21L and the right side frame 21R are each a plate-like frame that is thick in the left-right direction.

[0021] The vehicle seat 100 includes a reclining device 5 that adjusts the inclination of a seat back 2 relative to a seat cushion 1, and a seat lifter device 6 that adjusts the vertical height of the seat cushion 1. The seat lifter device 6 includes a parallel link mechanism, and includes a left rear link member 61L provided on the left rear, a right rear link member 61R provided on the right rear, a left front link member 62L provided on the left front, a right front link member 62R provided on the right front, and a cylindrical torque rod 60 made of a pipe or the like that rotatably passes through through holes that are formed in the rear end of the left side frame 11L and the rear end of the right side frame 11R and that penetrate laterally.

[0022] The left rear link member 61L has a lower end rotatably connected to the riser 71L via a hinge pin or the like, and an upper end connected to the left end of the torque rod 60. As shown in FIG. 3, a motor 63 is fixed to the left side surface of the left side frame 11L via a fixing bracket 64. The motor 63 is an example of an electric drive device that is activated by operating an operation button or the like (not shown). The power of the motor 63 is configured to be transmittable to the left rear link member 61L.

[0023] The right rear link member 61R has a lower end rotatably connected to the riser 71R via a hinge pin or the like, and an upper end connected to the right end of the torque rod 60.

[0024] The left front link member 62L has a lower end rotatably connected to a riser 72L via a hinge pin or the like, and an upper end rotatably connected to the front end of the left side frame 11L.

[0025] The right front link member 62R has a lower end rotatably connected to a riser 72R via a hinge pin or the like, and an upper end rotatably connected to the front end of the right side frame 11R.

[0026] Fig. 4 is a schematic diagram of the rear end portion of the left side frame 11L viewed from the right side, Fig. 5 is a schematic cross-sectional view taken along the line AA in Fig. 4, and Fig. 6 is a schematic cross-sectional view taken along the line BB in Fig. 4.

[0027] As shown in Fig. 4, the left side frame 11L is provided with a through-hole 110 that penetrates in the left-right direction. A pinion gear 66 is fixed to the output shaft of a motor 63 that is fixed to the left side frame 11L by a fixing bracket 64. As shown in Fig. 5, the pinion gear 66 is inserted into the through-hole 110 from the left side of the left side frame 11L and is disposed to the right of the left side frame 11L.

[0028] The left rear link member 61L is shaped like a plate that is thick in the left-right direction, and as shown in FIG. 4, a through-hole 613 that penetrates the left-right direction is connected to the torque rod 60. A sector gear 611 that meshes with the pinion gear 66 is provided in the left rear link member 61L between the pinion gear 66 and the through-hole 613. The sector gear 611 is fastened to the left rear link member 61L by fastening members V1 and V2, such as bolts and nuts. As shown in FIGS. 5 and 6, the sector gear 611 is provided between the left side frame 11L and the left rear link member 61L.

[0029] When the motor 63 is operated and the pinion gear 66 rotates, in response to this rotation, the sector gear 611 that meshes with the pinion gear 66, the left rear link member 61L that is integrated with the sector gear 611, and the torque rod 60 that is connected to the sector gear 611 rotate about the axis RC (see FIG. 4) of the torque rod 60. When the torque rod 60 rotates, the right rear link member 61R that is connected to the torque rod 60 also rotates, and the left front link member 62L and the right front link member 62R also rotate, causing the cushion frame 11 to move up and down.

[0030] In this way, the left rear link member 61L, the right rear link member 61R, the left front link member 62L, the right front link member 62R, the torque rod 60, the left side frame 11L, the right side frame 11R, the riser 71L, the riser 71R, the riser 72L, and the riser 72R form a parallel link mechanism that moves the seat cushion 1 in the vertical direction while maintaining its posture relative to the vehicle floor F.

[0031] 5, the left rear link member 61L includes a first region 614 facing the left side frame 11L across the sector gear 611, a second region 615 located closer to the left side frame 11L than the first region 614, and a third region 616 connecting the first region 614 and the second region 615. The sector gear 611 is fastened to the first region 614 by fastening members V1 and V2 (see FIG. 4).

[0032] The lower end of the second region 615 shown in FIG. 5 is rotatably connected to the riser 71L. The position of this lower end is restricted by the left-right position of the upper rail 32. Meanwhile, in the first region 614, the sector gear 611 is provided between the left side frame 11L and the left region. Therefore, if the left-right position is to be the same as that of the second region 615, the sector gear 611, the motor 63, and the like must be moved to the right from the state shown in FIG. 5. As shown in FIG. 5, the left-right position misalignment between the first region 614 and the second region 615 allows the sector gear 611, the motor 63, and the like to be positioned further inward of the seat, which contributes to reducing the seat width.

[0033] It should be noted that when the first region 614 and the second region 615 are positioned differently in the left-right direction in this way, the strength of the left rear link member 61L in the thickness direction is lower in the third region 616 than in the other regions.

[0034] As shown in FIG. 4, the left rear link member 61L is provided with an elongated hole 612 shaped along the arc of a circle centered on the axis RC, penetrating in the left-right direction between the sector gear 611 and the through-hole 613.

[0035] As shown in FIG. 6 , a cylindrical restriction pin 67 extending in the left-right direction is inserted through the elongated hole 612. A through-hole 111 penetrating the left side frame 11L in the left-right direction is formed at a position facing one end (left end) of the restriction pin 67. A fastening member V3, such as a bolt or a screw, is inserted into the through-hole 111 from the left side of the left side frame 11L to fasten and support the left end of the restriction pin 67 together with the fixed bracket 64 and the reinforcing plate 65 between the fixed bracket 64 and the left side frame 11L to the left side frame 11L. The restriction pin 67 restricts the rotation range of the left rear link member 61L. In other words, the left rear link member 61L is rotatable between a position where the restriction pin 67 abuts against one longitudinal end of the elongated hole 612 and a position where the restriction pin 67 abuts against the other longitudinal end of the elongated hole 612.

[0036] The vehicle seat 100 is further provided with a presser bracket 68 that supports the other end (right end) of the restriction pin 67 and also supports the shaft of the pinion gear 66. The presser bracket 68 is shaped like a plate that is thick in the left-right direction, and is provided to the right of the left rear link member 61L, as shown in Figures 5 and 6.

[0037] As shown in FIG. 4, the presser bracket 68 extends in the front-rear direction from the position of the regulating pin 67, straddling the pinion gear 66. The presser bracket 68 is fixed to the regulating pin 67 at its rear end. The presser bracket 68 is fastened to the left side frame 11L at two locations at its front end, together with the fixing bracket 64 and the reinforcing plate 65, by fastening members V4 such as bolts or screws. The left side frame 11L has through-holes that penetrate in the left-right direction at positions opposite the two fastening members V4. The presser bracket 68 rotatably supports the shaft of the pinion gear 66 between the front and rear fastening locations.

[0038] 5 and 6, a plate-shaped reinforcing plate 65 having a thickness in the left-right direction is provided between the fixed bracket 64 and the left side frame 11L. The reinforcing plate 65, together with the fixed bracket 64, is fastened to the left surface 11Ls (see FIG. 6) of the left side frame 11L.

[0039] 7 is a perspective view schematically illustrating the configuration of the fixed bracket 64 and the reinforcing plate 65. The fixed bracket 64 has a shape that extends in the front-rear direction along the pressing bracket 68. The fixed bracket 64 has a first surface 641 fastened to the surface 11Ls of the left side frame 11L by fastening members V3 (see FIG. 6), a second surface 642 fastened to the surface 11Ls of the left side frame 11L by fastening members V4 (see FIG. 4), a third surface 643 fastened to the motor 63, and a cylindrical tube portion 644, for example, protruding from the third surface 643 toward the left side frame 11L. The third surface 643 is provided between the first surface 641 and the second surface 642 and is provided at a position farther from the left side frame 11L than the first surface 641 and the second surface 642.

[0040] The first surface portion 641 and the second surface portion 642 each have a flat plate shape that is perpendicular to the left-right direction, for example. The first surface portion 641 has a fastening hole 64A that penetrates in the thickness direction. The second surface portion 642 has two fastening holes 64B that penetrate in the thickness direction, lined up above and below. The third surface portion 643 is located to the left of the first surface portion 641 and the second surface portion 642, and has a flat plate shape that is perpendicular to the left-right direction. The third surface portion 643 has four fastening holes 64C that penetrate in the thickness direction around the periphery of the tubular portion 644.

[0041] The motor 63 is fastened to the left surface of the third surface portion 643 by fastening members such as bolts or screws inserted into the four fastening holes 64C. The output shaft of the motor 63 is disposed on an inner circumferential portion 644A of the cylindrical portion 644, and a pinion gear 66 is provided on the inner circumferential portion 644A.

[0042] The reinforcing plate 65 has a shape that extends in the front-rear direction along the pressing bracket 68. The reinforcing plate 65 is provided with an opening 65A that penetrates the plate in the thickness direction at a position facing the inner periphery 644A of the cylindrical portion 644 of the fixed bracket 64, a fastening hole 65B that penetrates the plate in the thickness direction at a position facing the fastening hole 64A of the fixed bracket 64, and a fastening hole 65C that penetrates the plate in the thickness direction at a position facing the fastening hole 64B of the fixed bracket 64.

[0043] 6, the fastening hole 64A of the fixing bracket 64, the fastening hole 65B of the reinforcing plate 65, the through hole 111 of the left side frame 11L, and the restriction pin 67 are arranged to overlap in the left-right direction and are fastened together by a fastening member V3. The pinion gear 66 arranged in the inner circumferential portion 644A is inserted into the opening 65A of the reinforcing plate 65 and the through hole 110 of the left side frame 11L (see FIG. 4), and is arranged inside the left side frame 11L.

[0044] The fastening hole 64B of the fixed bracket 64, the fastening hole 65C of the reinforcing plate 65, the through hole provided in the left side frame 11L, and the right end portion of the pressing bracket 68 are arranged overlapping in the left-right direction and are fastened together by the fastening member V4.

[0045] The reinforcing plate 65 has a first region 651 that is in surface contact with the first surface portion 641 of the fixed bracket 64, a second region 652 that is in surface contact with the second surface portion 642 of the fixed bracket 64, and a third region 653 that faces the third surface portion 643 of the fixed bracket 64.

[0046] 5, when the fixed bracket 64 and the reinforcing plate 65 are fastened to the left side frame 11L, a part of the third region 653 of the reinforcing plate 65 abuts against the tip surface of the tubular portion 644. In order to fasten the motor 63 to the left surface of the fixed bracket 64, the third surface portion 643 is provided at a position far from the left side frame 11L. Therefore, the fastening strength of the fixed bracket 64 to the left side frame 11L is reduced between the left side frame 11L and the third surface portion 643.

[0047] The reinforcing plate 65 is provided with a flat third region 653 facing the third surface portion 643, and the third region 653 is in surface contact with the left side frame 11L. Providing the reinforcing plate 65 can increase the fastening force between the fixed bracket 64 and the left side frame 11L.

[0048] Fig. 8 is an enlarged right side view of a main portion near the rear end of the left rear link member 61L of the vehicle seat 100. Fig. 8 shows a straight line VL connecting the axis RC and the restriction pin 67, and a circle VC centered on the axis RC. When the left rear link member 61L rotates, the restriction pin 67 moves relative to the elongated hole 612 along an arc of the circle VC.

[0049] 8 also shows a distance L1 between the edge of the elongated hole 612 on the sector gear 611 side in the direction in which the straight line VL extends and the restriction pin 67, and a distance L2 between the edge of the elongated hole 612 on the opposite side to the sector gear 611 side in the direction in which the straight line VL extends and the restriction pin 67. Distance L1 is smaller than distance L2.

[0050] When an impact is applied from behind to a vehicle equipped with the vehicle seat 100, a downward force is applied to the left rear link member 61L. The movement of the left rear link member 61L is locked by the meshing of the sector gear 611 and the pinion gear 66. Therefore, a reaction force acting in the upward direction U against the force acting on the left rear link member 61L is transmitted to the pinion gear 66, and this reaction force is transmitted from the pinion gear 66 to the reinforcing plate 65 and the fixed bracket 64 via the pressing bracket 68.

[0051] Therefore, when the impact occurs, a force acts to move the restriction pin 67 in the upward direction U within the elongated hole 612. When the distance L1 is smaller than the distance L2, the movement distance of the restriction pin 67 when the restriction pin 67 moves in the upward direction U from the state shown in FIG. 8 can be shortened, compared to when the distance L1 is equal to or greater than the distance L2. This is because a small distance L1 shortens the distance until the restriction pin 67 contacts the edge of the elongated hole 612. The distance L1 is not particularly limited, but is preferably set to approximately 1 mm to 3 mm. When the distance L2 is larger than the distance L1, the restriction pin 67 can move smoothly relative to the elongated hole 612 even if manufacturing variations in the shape of the elongated hole 612 occur.

[0052] Furthermore, Figure 8 shows the shortest distance between the boundary BL and the fastening point (fastening member V2) of the first region 614 with the sector gear 611 (fastening member V1 and fastening member V2) that is closest to the boundary BL between the first region 614 and the third region 616 as distance L3.

[0053] As described above, when a force is applied to the pinion gear 66 in the upward direction U, a force acts on the pinion gear 66 and the motor 63 connected thereto, tending to rotate them counterclockwise, as indicated by the thick arrow in FIG. 5. When the pinion gear 66 rotates counterclockwise in the state shown in FIG. 5, a force acts on the sector gear 611 to tilt it toward the left in the direction L in FIG. 5. Because the third region 616 has low strength, this force causes the boundary BL between the first region 614 and the third region 616 to move toward the right in the direction R in FIG. 5, tilting the first region 614 to the left. This force tending to tilt the first region 614 of the left rear link member 61L leftward can be reduced by reducing the distance L3 shown in FIG. 8. Furthermore, increasing the section modulus of the boundary BL can more effectively suppress tilting of the first region 614.

[0054] Increasing the plate thickness is a normal design method for increasing the section modulus of the boundary BL, but setting the distance L3 within a certain range is effective for reducing the weight of the left rear link member 61L.

[0055] As a result of verification, it was found that if the distance L3 is set to 15 mm or more and 24 mm or less, the left rear link member 61L can be made lighter and the strength required for the left rear link member 61L can be ensured while suppressing the inclination of the first region 614 of the left rear link member 61L to a level that does not pose a practical problem. By suppressing the inclination of the first region 614, it is possible to prevent the meshing between the sector gear 611 and the pinion gear 66 from becoming shallow, and to increase the strength of the gear teeth.

[0056] As described above, this specification discloses the following matters. The following components and the like corresponding to the above-described embodiments are described in parentheses, but the present invention is not limited to these.

[0057] (1) A vehicle seat (vehicle seat 100) in which the height of a seat cushion (seat cushion 1) can be adjusted, a drive link member (left rear link member 61L) provided with a second gear (sector gear 611) that meshes with a first gear (pinion gear 66) supported by the seat cushion, and configured to be rotatable in response to rotation of the first gear; a long hole (long hole 612) provided in the driving link member and shaped along an arc of a circle (circle VC) centered on the rotation center (axis center RC) of the driving link member; a restricting member (restricting pin 67) that is inserted into the elongated hole and has one end supported by the seat cushion, and that restricts the rotation range of the drive link member; a support member (presser bracket 68) that supports the other end of the regulating member and supports the shaft of the first gear, A vehicle seat in which a first distance (distance L1) between the edge of the elongated hole on the second gear side and the regulating member in a direction connecting the rotation center and the regulating member is smaller than a second distance (distance L2) between the edge of the elongated hole on the opposite side to the second gear side and the regulating member.

[0058] According to (1), when a force is generated that tends to rotate the drive link member, a reaction force of that force is transmitted to the restricting member, causing the restricting member to move in a direction intersecting the direction of extension of the elongated hole. Because the restricting member is located in a position within the elongated hole close to the second gear, even when the restricting member moves in the aforementioned direction, the movement distance can be reduced. Therefore, contact between the restricting member and the edge of the elongated hole can suppress movement of the restricting member, the support member that supports it, and the first gear supported by it. This prevents the meshing between the first gear and the second gear from becoming shallow, improving the strength of the seat.

[0059] (2) The vehicle seat according to (1), an electric drive unit (motor 63) that drives the first gear and is provided on the opposite side of the support member across the frame (left side frame 11L) of the seat cushion; a fixing bracket (fixing bracket 64) provided between the electric drive unit and the frame for fixing the electric drive unit to the frame; A vehicle seat comprising: a plate member (reinforcement plate 65) provided between the fixed bracket and the frame.

[0060] According to (2), when force is applied to the fixed bracket via the support member or the first gear, the rigidity of the plate member can be utilized to suppress deformation of the fixed bracket, thereby more effectively preventing the meshing between the first gear and the second gear from becoming shallow.

[0061] (3) The vehicle seat according to (2), The one end of the restricting member is fastened to the plate member and the fixing bracket.

[0062] According to (3), when force is applied to the fixed bracket via the support member or the first gear, the rigidity of the plate member can be utilized to suppress deformation of the fixed bracket, thereby better preventing the meshing between the first gear and the second gear from becoming shallow.

[0063] (4) The vehicle seat according to (2) or (3), The fixed bracket has a first surface portion (first surface portion 641) fastened to the frame, a second surface portion (second surface portion 642) fastened to the frame, a third surface portion (third surface portion 643) fastened to the electric drive device, and a tubular portion (tubular portion 644) protruding from the third surface portion toward the frame, the third surface portion is provided between the first surface portion and the second surface portion, and is provided at a position farther from the frame than the first surface portion and the second surface portion; The plate member is fastened to the support member and the frame together with the fixing bracket between the first surface portion, the second surface portion and the frame, and has an area (third area 653) that is positioned between the third surface portion and the frame.

[0064] According to (4), the fixing bracket can be firmly fixed to the support member and the frame by the plate member, so even if force is applied to the support member or the first gear, the force transmitted to the fixing bracket can be dispersed and deformation of the fixing bracket can be suppressed. By suppressing deformation of the fixing bracket, displacement of the first gear can be suppressed and shallow meshing between the first gear and the second gear can be further prevented.

[0065] (5) (4) A vehicle seat according to the present invention, The driving link member includes a first region (first region 614) facing the frame across the second gear, a second region (second region 615) located closer to the frame than the first region, and a third region (third region 616) connecting the first region and the second region, the second gear is fastened to the first region, A vehicle seat in which the shortest distance (distance L3) between the fastening point (fastening member V2) of the first region with the second gear that is closest to the third region and the boundary (boundary BL) between the first region and the third region is 15 mm or more and 24 mm or less.

[0066] According to (5), deformation of the driving link member can be suppressed. [Explanation of symbols]

[0067] 1 seat cushion 2 seat backs 3 Rail mechanism 5 Reclining device 6 Seat lifter device 11 Cushion Frame 11L, 21L left side frame 11R, 21R right side frame 11Ls surface 21 Back Frame 31 Lower rail 32 Upper Rail 60 Torque rod 61L Left rear link member 61R Right rear link member 62L Left front link member 62R Right front link member 63 Motor 64 Fixing bracket 64A, 64B, 64C, 65B, 65C Fastening holes 65 Reinforcement plate 65A opening 66 Pinion gear 67 Regulatory pin 68 Bracket 71L, 71R, 72L, 72R risers 100 Vehicle seats 110,111,613 Through holes 611 Sector gear 612 long hole 614,651 1st area 615,652 2nd area 616,653 Third area 641 First side 642 Second side part 643 Third side 644 Cylinder part 644A Inner Peripheral Section V1, V2, V3, V4 bonding components Distances between L1, L2, and L3

Claims

1. A vehicle seat having a height-adjustable seat cushion, a drive link member provided with a second gear that meshes with a first gear supported by the seat cushion and that is configured to be rotatable in response to rotation of the first gear; an elongated hole provided in the drive link member and shaped along an arc of a circle centered on the rotation center of the drive link member; a restricting member that is inserted into the elongated hole and has one end supported by the seat cushion, and that restricts the rotation range of the drive link member; a support member that supports the other end of the regulating member and supports the shaft of the first gear, A vehicle seat, wherein a first distance between the edge of the elongated hole on the second gear side and the regulating member in a direction connecting the rotation center and the regulating member is smaller than a second distance between the edge of the elongated hole on the opposite side to the second gear side and the regulating member.

2. 2. The vehicle seat according to claim 1, an electric drive unit that drives the first gear and is provided on the opposite side of the support member across the frame of the seat cushion; a fixing bracket provided between the electric drive unit and the frame for fixing the electric drive unit to the frame; a plate member provided between the fixed bracket and the frame.

3. 3. The vehicle seat according to claim 2, The one end of the restricting member is fastened to the plate member and the fixing bracket.

4. The vehicle seat according to claim 2 or 3, the fixed bracket has a first surface portion fastened to the frame, a second surface portion fastened to the frame, a third surface portion fastened to the electric drive device, and a tubular portion protruding from the third surface portion toward the frame, the third surface portion is provided between the first surface portion and the second surface portion, and is provided at a position farther from the frame than the first surface portion and the second surface portion, The plate member is fastened to the support member and the frame together with the fixing bracket between the first surface portion, the second surface portion and the frame, and has an area positioned between the third surface portion and the frame.

5. 5. The vehicle seat according to claim 4, the driving link member includes a first region facing the frame across the second gear, a second region positioned closer to the frame than the first region, and a third region connecting the first region and the second region, the second gear is fastened to the first region, A vehicle seat, wherein the shortest distance between the closest fastening point of the first region with the second gear to the third region and the boundary between the first region and the third region is 15 mm or more and 24 mm or less.

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