JP2023139959A - Suspension for vehicle seat and vehicle seat - Google Patents

Abstract

To suppress dropping of a lower rotary shaft from rear ends of right and left lower rails in the event of collision of a vehicle.SOLUTION: A suspension 30 for a vehicle seat 10 comprises: right and left lower rails 34 fixed to a floor part of a vehicle body; right and left upper rails that are disposed above the right and left lower rails 34, and which a seat body part to which an occupant of a vehicle is restricted by a seat belt is connected to; right and left X links 38 that lift and lower the right and left upper rails by connecting the right and left lower rails 34 to the right and left upper rails respectively, and extending/shrinking in synchronization with each other; a lower rotary shaft 56 on both end parts in a lateral direction of the seat are rotatably supported by rear end parts of the right and left lower rails 34, and to which one link arm 40 that the right and left X links 38 have is fixed; and a center bracket 70 that is fixed to the floor part of the vehicle body, and which faces an intermediate part in the lateral direction of the seat of the lower rotary shaft 56 from above the seat.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle seat, and more particularly to a suspension for a vehicle seat.

The suspension seat described in Patent Document 1 below connects left and right lower rails fixed to the floor of the vehicle body, left and right upper rails arranged above the left and right lower rails, and the left and right lower rails and the left and right upper rails, respectively. It is equipped with left and right X-links. The left and right X links move the left and right upper rails up and down by expanding and contracting in synchronization with each other. A seat body portion on which an occupant sits is connected to the left and right upper rails, and the occupant is restrained to the seat body portion by a seat belt device. One of the pair of link arms of the left and right X links is fixed to the lower rotation shaft. The lower rotating shaft is rotatably supported at both end portions in the left and right direction of the seat at the rear end portions of the left and right lower rails.

JP 2021-46172 Publication

In the above-mentioned prior art, when an excessive load from an occupant trying to move inertially toward the front of the seat during a vehicle collision acts on the seat body through the seat belt, the seat body tries to rotate toward the front of the seat. At that time, the lower rotating shaft to which one of the link arms of the left and right X links is fixed tries to displace above the seat and toward the front of the seat. As a result, if the lower rotating shaft is significantly deformed, this may cause the lower rotating shaft to fall off from the rear end portions of the left and right lower rails.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a suspension for a vehicle seat and a vehicle seat that can suppress the lower rotating shaft from falling off from the rear end portions of the left and right lower rails in the event of a vehicle collision.

The vehicle seat suspension of the first aspect is configured to connect left and right lower rails that are fixed to the floor of the vehicle body, and a seat body that is disposed above the left and right lower rails and on which a vehicle occupant is restrained by a seat belt. left and right upper rails connected to the left and right upper rails, left and right X-links that connect the left and right lower rails and the left and right upper rails and move the left and right upper rails up and down by extending and contracting in synchronization with each other, and rear ends of the left and right lower rails. Both ends of the seat in the left and right direction are rotatably supported by the section, a lower rotating shaft to which one of a pair of link arms of the left and right X links is fixed, and a lower rotating shaft fixed to the floor section and the lower side A center bracket is provided that faces an intermediate portion of the rotating shaft in the left-right direction of the seat from above the seat.

Note that "fixed" in the first aspect means not to move relative to the object. This "fixing" includes not only direct fixation to the object but also indirect fixation via another member. This point also applies to "fixing" in the second, fourth, sixth, and seventh aspects.

In the vehicle seat suspension of the first aspect, the left and right lower rails are fixed to the floor of the vehicle body, and the seat main body is connected to the left and right upper rails arranged above the left and right lower rails. A vehicle occupant is restrained by a seat belt on the seat body. The left and right lower rails and the left and right upper rails are connected by left and right X links, respectively. These left and right X links expand and contract in synchronization with each other, so that the upper rail moves up and down together with the seat body. One of the pair of link arms of the left and right X links is fixed to the lower rotation shaft. Both end portions of the lower rotating shaft in the seat left and right direction are rotatably supported by the rear end portions of the left and right lower rails.

In this aspect, when an excessive load from an occupant trying to inertially move toward the front of the seat acts on the seat body through the seat belt during a vehicle collision, the seat body shifts around the front end sides of the left and right lower rails. The seat tries to rotate toward the front. At that time, the lower rotating shaft to which one of the pair of link arms of the left and right X-links is fixed tends to be displaced toward the upper side of the seat and the front side of the seat. An intermediate portion of the lower rotating shaft in the seat lateral direction faces a center bracket fixed to the floor of the vehicle body from below the seat. By engaging the center bracket with the lower rotating shaft, deformation of the lower rotating shaft is suppressed. As a result, it is possible to prevent the lower rotating shaft from falling off from the rear end portions of the left and right lower rails.

In the vehicle seat suspension of the second aspect, in the first aspect, the left and right reinforcing patches are arranged above the seat with respect to both ends of the lower rotating shaft in the left and right direction of the seat, and are fixed to the upper surfaces of the left and right lower rails. It is equipped with

In the vehicle seat suspension of the second aspect, left and right reinforcing patches arranged above the seat with respect to both end portions of the lower rotating shaft in the left and right direction of the seat are fixed to the upper surfaces of the left and right lower rails. This suppresses deformation of the left and right lower rails when the lower rotating shaft attempts to displace above the seat and toward the front of the seat, thereby preventing the lower rotating shaft from falling off from the rear ends of the left and right lower rails. It becomes easier to suppress.

In the vehicle seat suspension according to the third aspect, in the first aspect or the second aspect, the center bracket faces the lower rotating shaft with a gap therebetween.

In the third aspect of the vehicle seat suspension, the center bracket faces the lower rotating shaft with a gap therebetween. Thereby, when the left and right X links expand and contract, the lower rotating shaft to which one of the link arms is fixed can be smoothly rotated.

In any one of the first to third aspects, the suspension of the vehicle seat according to the fourth aspect spans between the lower surfaces of the rear end portions of the left and right lower rails, and is fixed to the floor portion. The center bracket is fixed to an upper surface of the rear floor bracket.

In the vehicle seat suspension of the fourth aspect, a center bracket is fixed to the upper surface of a rear floor bracket that spans between the lower surfaces of the rear end portions of left and right lower rails and is fixed to the floor of the vehicle body. This eliminates the need to fix the center bracket to the floor of the vehicle body separately from the rear floor bracket.

In the vehicle seat suspension according to a fifth aspect, in any one of the first to fourth aspects, the center bracket includes a notch portion that is open on both sides in the left-right direction of the seat and on the lower side of the seat. is formed, and an intermediate portion of the lower rotating shaft in the seat left-right direction is inserted into the notch.

In the vehicle seat suspension of the fifth aspect, the intermediate portion of the lower rotating shaft in the seat left-right direction is inserted into the above-mentioned notch formed in the center bracket. Therefore, when the lower rotating shaft attempts to displace toward the upper side of the seat and the front side of the seat, it is possible to prevent the lower rotating shaft from accidentally coming off from the center bracket.

In the vehicle seat suspension according to a sixth aspect, in the fifth aspect, the center bracket includes left and right side walls facing each other in the left-right direction of the seat, and an upper wall portion connecting the upper ends of the left and right side walls. , having left and right fixing wall portions extending outward in the left-right direction of the seat from lower end portions of the left and right side wall portions and fixed to the floor portion, and the cut portions are formed in the left and right side wall portions, respectively. has been done.

In the vehicle seat suspension according to the sixth aspect, since the center bracket has the above-mentioned left and right side wall portions, upper wall portion, and left and right fixed wall portions, the center bracket may be manufactured by, for example, press molding of sheet metal. I can do it. This center bracket has an inverted U-shaped section formed by left and right side walls and an upper wall. The left-right intermediate portion is inserted. This makes it easy to ensure the strength of the center bracket against the load applied from the lower rotating shaft.

In the vehicle seat suspension according to a seventh aspect, in the second aspect, two bolts for fixing the lower rail to the floor pass through the reinforcing patch, and the reinforcing patch has two bolts passing through the reinforcing patch. A portion between the two bolts is arranged above the seat of the lower rotating shaft.

According to the vehicle seat suspension of the seventh aspect, the left and right reinforcing patches, which are arranged above the seat with respect to both ends of the lower rotation shaft in the left and right direction of the seat and are fixed to the upper surfaces of the left and right lower rails, are attached to the left and right reinforcing patches that connect the lower rail to the vehicle body. There are two bolts that go through it to fix it to the floor. A portion of the reinforcing patch between the two bolts is arranged above the seat of the lower rotating shaft. As a result, the seating surfaces of the two bolts are expanded with one reinforcing patch, so the strength of the lower rail against the load from the lower rotating shaft can be improved with a reduced number of parts.

A vehicle seat according to an eighth aspect includes a seat body portion having a seat cushion on which a vehicle occupant sits, a seat back that supports the back of the occupant, and a seat belt device that restrains the occupant to the seat body portion. and a suspension for a vehicle seat according to any one of the first to seventh aspects, wherein the seat main body is connected to the left and right upper rails.

In the vehicle seat of the eighth aspect, an occupant of the vehicle sits on a seat cushion included in the seat body, and the back of the occupant is supported by a seat back included in the seat body. An occupant is restrained by a seat belt device on this seat body. This seat body portion is connected to left and right upper rails of the suspension. Since this suspension is of any one of the first to seventh aspects, the above-described actions and effects can be obtained.

As described above, in the vehicle seat suspension and vehicle seat according to the present invention, it is possible to suppress the lower rotating shaft from falling off from the rear end portions of the left and right lower rails in the event of a vehicle collision.

FIG. 1 is a side view showing a vehicle seat according to an embodiment. FIG. 2 is a side view showing a suspension included in the vehicle seat according to the embodiment. FIG. 2 is a first perspective view showing a configuration around a lower rotating shaft in the suspension according to the embodiment. FIG. 3 is a second perspective view showing the configuration around the lower rotating shaft in the suspension according to the embodiment. FIG. 4 is an enlarged perspective view of a part of the configuration shown in FIG. 3;

Hereinafter, a vehicle seat 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. Note that some symbols may be omitted in each figure to make the drawings easier to read. Further, arrows FR, LH, RH, and UP appropriately described in each figure indicate the front, left, right, and upper side of the vehicle seat 10, respectively. Hereinafter, when simply using the front, back, left, right, top and bottom directions, the directions with respect to the vehicle seat 10 will be shown.

As shown in FIG. 1, a vehicle seat 10 according to an embodiment of the present invention includes a seat main body 12 and a suspension 30. This vehicle seat 10 is, for example, a driver's seat of a right-hand drive vehicle. The seat body 12 includes a seat cushion 14 on which a vehicle occupant sits, a seat back 16 that supports the back of the occupant, and a three-point seat belt device 18 that restrains the occupant to the seat body 12. There is.

The seat belt device 18 includes a retractor (not shown) provided inside the seat back 16. One longitudinal end of a seatbelt (webbing) 20 is locked to the take-up shaft of this retractor. The other end in the longitudinal direction of the seat belt 20 is locked to an anchor member (not shown) provided on one side (right side in this case) of the seat cushion 14 in the left and right direction. A longitudinally intermediate portion of the seat belt 20 is wrapped around a belt anchor bracket (not shown) provided at the shoulder opening on one side (right side in this case) of the seat back 16 in the left and right direction. A tongue plate (not shown) is attached to a longitudinally intermediate portion of the seat belt 20 between the anchor member and the belt anchor bracket. This tongue plate is connectable to a buckle 22 provided on the other side (left side in this case) of the seat cushion 14 in the left-right direction.

In the seat belt device 18 configured as described above, when the occupant seated on the seat cushion 14 of the seat body portion 12 connects the tongue plate to the buckle 22, the occupant wears the seat belt 20. In this wearing state, the portion of the seatbelt 20 from the belt anchor bracket to the tongue plate serves as a shoulder belt that restrains the occupant's upper body, and the portion of the seatbelt 20 from the tongue plate to the anchor member restrains the occupant's lower back. It becomes a lap belt.

The suspension 30 is a shock absorbing device that suppresses vibrations of the vehicle body from being transmitted to the seat body portion 12 when the vehicle is running, and is disposed below the seat body portion 12 . This suspension 30 is covered with a resin cover 32 shown in FIG. As shown in FIG. 2, the suspension 30 includes a lower rail 34, an upper rail 36, and an X link 38. The lower rail 34, the upper rail 36, and the X-link 38 are provided on both left and right sides of the suspension 30, respectively.

The left and right lower rails 34 are made of, for example, press-formed metal plates, and have an elongated shape with the longitudinal direction extending in the front-rear direction. Each lower rail 34 has a substantially U-shape with an open inner side in the left-right direction when viewed in the front-rear direction. A front floor bracket 44 (see FIGS. 1 and 2) is fixed to the front end of each lower rail 34, respectively. Each front floor bracket 44 is made of, for example, a press-formed metal plate, and is fixed to the front end of each lower rail 34 by means such as bolt fastening.

As shown in FIGS. 3 and 4, the rear end portion of each lower rail 34 is fixed to a rear floor bracket 46, respectively. The rear floor bracket 46 is made of, for example, a press-formed metal plate, and has an elongated plate shape with its longitudinal direction in the left-right direction and its thickness direction in the up-down direction. Both end portions of the rear floor bracket 46 in the left and right direction are overlapped with the lower surfaces of the rear end portions of the left and right lower rails 34. Each lower rail 34 is fixed to a rear floor bracket 46 using a pair of front and rear bolts 48. The front and rear bolts 48 pass through the lower rail 34 and the rear floor bracket 46 from above, and are screwed into a pair of front and rear nuts (not shown) arranged on the lower surface of the rear floor bracket 46. As a result, the rear end portions of the left and right lower rails 34 are fastened and fixed to the rear floor bracket 46, and the rear floor bracket 46 spans between the lower surfaces of the rear end portions of the left and right lower rails 34.

The left and right front floor brackets 44 extend downward and forward from the front ends of the left and right lower rails 34, and their lower ends are fixed to the floor of the vehicle body by means of bolt fastening or the like. Bolt holes 50 (see FIGS. 3 and 4) are formed at both left and right ends of the rear floor bracket 46, and bolts (not shown) inserted into these bolt holes 50 are used to attach the rear floor bracket 46 to the floor of the vehicle body. Fixed. Thereby, the left and right lower rails 34 are fixed to the floor of the vehicle body via the left and right front floor brackets 44 and the rear floor brackets 46.

The left and right upper rails 36 are arranged above the left and right lower rails 34, respectively. The left and right upper rails 36 are made of, for example, press-formed metal plates, and have an elongated shape with the longitudinal direction extending in the front-rear direction. Each upper rail 36 has a substantially U-shape with an open inward side in the left-right direction when viewed in the front-rear direction. These upper rails 36 are connected to the left and right lower rails 34 via left and right X links 38.

The left and right X links 38 are constructed by combining two link arms 40 and 42 in an X shape. The two link arms 40 and 42 are made of, for example, a press-formed metal plate, and have an elongated shape with the longitudinal direction being the longitudinal direction and the horizontal direction being the thickness direction. One link arm 40 is inclined upward as it goes forward, and the other link arm 42 is inclined downward as it goes forward. The two link arms 40 and 42 are connected to each other via a link shaft 52 at their longitudinally intermediate portions. The link shaft 52 has an axial direction extending in the left-right direction, and the two link arms 40 and 42 are relatively rotatable around the axis of the link shaft 52.

One link arm 40 of the left and right X links 38 has a front end fixed to the upper slide shaft 54 and a rear end fixed to the lower rotation shaft 56. The other link arm 42 of the left and right X links 38 has a front end fixed to the lower slide shaft 58 and a rear end fixed to the upper rotation shaft 60. The upper slide shaft 54, the lower rotation shaft 56, the lower slide shaft 58, and the upper rotation shaft 60 are made of, for example, metal pipe material, and are arranged with the left-right direction as the axial direction. The link arms 40 and 42 are fixed to an upper slide shaft 54, a lower rotation shaft 56, a lower slide shaft 58, and an upper rotation shaft 60 by means such as welding.

The upper slide shaft 54 is inserted inside the front portions of the left and right upper rails 36, and is slidable in the front-back direction with respect to the left and right upper rails 36. Both ends of the lower slide shaft 58 in the left and right direction are inserted inside the front parts of the left and right lower rails 34, and are slidable in the front and rear directions with respect to the left and right lower rails 34.

Both ends of the lower rotating shaft 56 in the left and right direction are inserted inside the rear ends of the left and right lower rails 34 . As shown in FIGS. 3 and 4, bearing members 62 are fitted inside the rear end portions of the left and right lower rails 34, respectively. The left and right bearing members 62 are manufactured, for example, by injection molding of resin, and have an elongated block shape whose longitudinal direction is the longitudinal direction. Two bolts 48, front and rear, which fix each lower rail 34 to the rear floor bracket 46 pass through each bearing member 62. A bearing hole 64 is formed in the bearing member 62 between these two bolts 48, with the left-right direction being the axial direction and opening inward in the left-right direction. Both ends of the lower rotating shaft 56 in the left and right direction are rotatably fitted into bearing holes 64 of the left and right bearing members 62. Thereby, the lower rotating shaft 56 is rotatably supported by the rear end portions of the left and right lower rails 34 via the left and right bearing members 62.

Both left and right ends of the upper rotating shaft 60 are inserted inside the rear ends of the left and right upper rails 36. Although not shown, bearing members having basically the same configuration as the above-mentioned bearing member 62 are fitted inside the rear end portions of the left and right upper rails 36, respectively. The upper rotating shaft 60 is rotatably supported by the rear end portions of the left and right upper rails 36 via these bearing members.

In the suspension 30 configured as described above, the left and right X links 38 extend and contract synchronously with the lower rotation shaft 56 as a fulcrum, so that the left and right upper rails 36 move up and down in the vertical direction with respect to the left and right lower rails 34. Specifically, when the left and right upper rails 36 rise, the left and right X links 38 extend upward so that the inclination directions of the two link arms 40 and 42 approach the vertical direction. At this time, the upper slide shaft 54 and the lower slide shaft 58 linearly slide rearward relative to the left and right upper rails 36 and the left and right lower rails 34, and approach the upper rotation shaft 60 and the lower rotation shaft 56. .

On the other hand, when the left and right upper rails 36 descend toward the left and right lower rails 34, the left and right X links 38 contract downward so that the inclination directions of the two link arms 40 and 42 approach the front-rear direction. At this time, the upper slide shaft 54 and the lower slide shaft 58 linearly slide forward relative to the left and right upper rails 36 and the left and right lower rails 34, and are separated from the upper rotation shaft 60 and the lower rotation shaft 56. .

The suspension 30 configured as described above includes a spring (not shown) that urges the left and right upper rails 36 upward relative to the left and right lower rails 34, and a damper (not shown) that absorbs vibrations of the spring. The above-mentioned spring is, for example, an air spring supplied with compressed air via an air tube or the like from an air compressor that constitutes an air brake device of a vehicle, and the above-mentioned damper is, for example, a hydraulic cylinder type damper. The seat body portion 12 is connected to the left and right upper rails 36 via, for example, a well-known seat slide mechanism. The load of the occupant seated on the seat body 12 is elastically supported by the air spring, and vibrations of the seat body 12 are absorbed by the damper. Since the air spring bulges upward when air is supplied, the height positions of the left and right upper rails 36 and the seat body portion 12 are raised. Moreover, since the air spring contracts downward when the air is exhausted, the height positions of the left and right upper rails 36 and the seat body portion 12 are lowered.

As shown in FIGS. 3 to 5, this suspension 30 includes a center bracket 70 fixed to the upper surface of the rear floor bracket 46, and left and right reinforcing patches 84 fixed to the upper surface of the rear end portions of the left and right lower rails 34. It is equipped with As shown in FIGS. 3 and 4, the center bracket 70 is made of, for example, a press-formed metal plate, and is disposed above the center portion of the rear floor bracket 46 in the left-right direction. This center bracket 70 includes left and right side walls 72 that face each other in the left and right direction, an upper wall part 74 that connects the upper ends of the left and right side walls 72 in the left and right direction, and a left and right It has left and right fixed walls 76 extending outward in the direction.

The left and right fixed walls 76 are superimposed on the upper surface of the rear floor bracket 46, and two bolts 81 (not shown) passing through the left and right fixed walls 76 and the rear floor bracket 46 from above are located on the lower surface of the rear floor bracket 46. It is screwed into two nuts. As a result, the left and right fixing walls 76 are fastened and fixed to the rear floor bracket 46, and are also fixed to the floor of the vehicle body via the rear floor bracket 46. One of the fixed wall sections 76 (here, the left fixed wall section 76) has a positioning section 78 that extends rearward. The tip of the positioning portion 78 is bent downward and inserted into a positioning hole 82 formed in the rear floor bracket 46. When the left and right fixing walls 76 are fastened and fixed to the rear floor bracket 46, the center bracket 70 is positioned on the rear floor bracket 46 by the above-described insertion.

The left and right side wall portions 72 and the upper wall portion 74 of the center bracket 70 extend further forward than the rear floor bracket 46 and face the middle portion of the lower rotating shaft 56 in the left-right direction from above. Specifically, cut portions 80 are formed in the left and right side wall portions 72 on the front side of the left and right fixed wall portions 76, respectively. These notches 80 are open on both sides in the left-right direction and on the lower side, and the intermediate portion of the lower rotating shaft 56 in the seat left-right direction is inserted into these notches 80 . Each notch 80 has a semicircular shape concentric with the outer peripheral surface of the lower rotating shaft 56. A substantially C-shaped gap (number omitted) is formed between the edge of each notch 80 and the outer peripheral surface of the lower rotating shaft 56. They face each other with the gap shown above.

The left and right reinforcing patches 84 are arranged above both ends of the lower rotating shaft 56 in the left and right direction, and are fixed to the upper surfaces of the left and right lower rails 34. The left and right reinforcing patches 84 are formed into a substantially plate shape by, for example, press-formed metal plates, and are superimposed on the upper surfaces of the rear end portions of the left and right lower rails 34 . The left and right reinforcing patches 84 have an elliptical shape with the longitudinal direction extending in the front-rear direction when viewed in the up-down direction. Two front and rear bolts 48 that fix the rear end of the lower rail 34 to the rear floor bracket 46 pass through the front and rear ends of each reinforcing patch 84 . The front and rear ends of each reinforcing patch 84 serve as seating surfaces for the heads of the two bolts 48.

A portion of each reinforcing patch 84 between the two bolts 48 is disposed above the lower rotating shaft 56 . A bent portion 86 (numerals omitted except in FIG. 5) bent downward is formed at the inner edge of each reinforcing patch 84 in the left-right direction. This bent portion 86 extends in the front-rear direction above the lower rotating shaft 56. This bent portion 86 improves the bending strength of each reinforcing patch 84. Furthermore, a substantially circular through hole 88 is formed in the intermediate portion of each reinforcing patch 84 in the front-rear direction, thereby reducing the weight of each reinforcing patch 84.

(action and effect)
Next, the functions and effects of this embodiment will be explained.

In the suspension 30 included in the vehicle seat 10 having the above configuration, the left and right lower rails 34 are fixed to the floor of the vehicle body, and the seat main body 12 is connected to the left and right upper rails 36 arranged above the left and right lower rails 34. . A vehicle occupant is restrained by a seat belt 20 on the seat main body portion 12 . The left and right lower rails 34 and the left and right upper rails 36 are connected by left and right X links 38, respectively. As these left and right X links 38 expand and contract in synchronization with each other, the upper rail 36 moves up and down together with the seat body 12. One link arm 40 of the left and right X links 38 is fixed to a lower rotating shaft 56. Both end portions of the lower rotating shaft 56 in the seat left and right direction are rotatably supported by the rear end portions of the left and right lower rails 34 .

In this embodiment, when an excessive load from an occupant trying to move forward by inertia during a vehicle collision acts on the seat body 12 through the seat belt 20, the The seat body portion 12 attempts to rotate forward about the left and right front floor brackets 44. At that time, the lower rotating shaft 56 to which one link arm 40 is fixed tends to move upward and forward. An intermediate portion of the lower rotating shaft 56 in the left-right direction faces a center bracket 70 fixed to the floor of the vehicle body from below. By engaging the center bracket 70 with the lower rotating shaft 56, deformation of the lower rotating shaft 56 is suppressed. As a result, it becomes possible to suppress the lower rotating shaft 56 from falling off from the rear end portions of the left and right lower rails 34.

Furthermore, in this embodiment, left and right reinforcing patches 84 arranged above both ends of the lower rotating shaft 56 in the left and right direction are fixed to the upper surfaces of the left and right lower rails 34 . This suppresses deformation of the left and right lower rails 34 when the lower rotating shaft 56 attempts to displace upward and forward, so the lower rotating shaft 56 falls off from the rear end portions of the left and right lower rails 34. This makes it easier to suppress things.

Further, in this embodiment, the center bracket 70 faces the lower rotating shaft 56 with a gap therebetween. Thereby, when the left and right X links 38 expand and contract, the lower rotating shaft 56 to which one link arm 40 is fixed can be smoothly rotated.

Further, in this embodiment, a center bracket 70 is fixed to the upper surface of a rear floor bracket 46 that spans between the lower surfaces of the rear end portions of the left and right lower rails 34 and is fixed to the floor of the vehicle body. This eliminates the need for fixing the center bracket 70 to the floor of the vehicle body separately from the rear floor bracket 46.

Further, according to this embodiment, the center bracket 70 is formed with a notch 80 that is open on both sides in the left-right direction and the lower side, and the lower rotating shaft 56 is located in the notch 80 in the left-right direction. The middle part is inserted. Therefore, it is possible to prevent the lower rotating shaft 56 from accidentally coming off from the center bracket 70 when the lower rotating shaft 56 attempts to displace upward and forward.

Further, in this embodiment, since the center bracket 70 has the left and right side walls 72, the upper wall 74, and the left and right fixed walls 76, the center bracket 70 can be manufactured by press forming sheet metal, for example. can. The center bracket 70 has an inverted U-shaped cross section formed by left and right side walls 72 and an upper wall 74, and has a lower part formed in a notch 80 formed in each of the left and right side walls 72. A laterally intermediate portion of the side rotating shaft 56 is inserted. This makes it easy to ensure the strength of the center bracket 70 against the load applied from the lower rotating shaft 56.

Further, according to this embodiment, the left and right reinforcing patches 84, which are arranged above both ends of the lower rotation shaft 56 in the left and right direction and are fixed to the upper surfaces of the left and right lower rails 34, have the lower rails 34 attached to the floor of the vehicle body. Two bolts 48 for fixing are passed through. A portion of each reinforcing patch 84 between the two bolts 48 is arranged above the lower rotating shaft 56. As a result, the seating surfaces of the two bolts 48 are expanded with one reinforcing patch 84, so that the strength of the lower rail 34 against the load from the lower rotating shaft 56 can be improved with a reduced number of parts.

In the above embodiment, the two bolts 48 for fixing the lower rail 34 to the floor of the vehicle body pass through one reinforcing patch 84, but the present invention is not limited to this. For example, two bolts may pass through two reinforcing patches.

Further, in the above embodiment, the center bracket 70 has the left and right side walls 72, the upper wall 74, and the left and right fixed walls 76, and the left and right side walls 72 are each formed with a notch 80. However, the configuration of the center bracket is not limited to this, and the configuration of the center bracket can be changed as appropriate.

Further, in the above embodiment, the center bracket 70 is fixed to the floor of the vehicle body via the rear floor bracket 46, but the structure is not limited to this, and the center bracket may be directly fixed to the floor of the vehicle body. Good too.

Further, in the above embodiment, the center bracket 70 is configured to face the lower rotating shaft 56 with a gap therebetween, but the present invention is not limited to this. For example, a resin member may be interposed between the center bracket and the lower rotating shaft.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof. Moreover, it goes without saying that the scope of the rights of the present invention is not limited to the above embodiments.

10 Vehicle seat 12 Seat body 14 Seat cushion 16 Seat back 20 Seat belt 30 Suspension 34 Lower rail 36 Upper rail 38 X link 40 One link arm 46 Rear floor bracket 48 Bolt 56 Lower rotating shaft 70 Center bracket 72 Side wall 74 Upper wall Part 76 Fixed wall part 80 Notch part 84 Reinforcement patch

Claims (8)

The left and right lower rails are fixed to the floor of the vehicle,
left and right upper rails that are arranged above the left and right lower rails and to which are connected a seat body portion to which a vehicle occupant is restrained by a seat belt;
left and right X-links that connect the left and right lower rails and the left and right upper rails, respectively, and extend and contract in synchronization with each other to raise and lower the left and right upper rails;
a lower rotation shaft having both end portions in the left and right direction of the seat rotatably supported by the rear end portions of the left and right lower rails, and to which one of a pair of link arms of the left and right X links is fixed;
a center bracket fixed to the floor portion and facing an intermediate portion of the lower rotating shaft in the left-right direction of the seat from above the seat;
Vehicle seat suspension with The vehicle seat suspension according to claim 1, further comprising left and right reinforcing patches arranged above the seat with respect to both end portions of the lower rotating shaft in the left and right direction of the seat and fixed to upper surfaces of the left and right lower rails. 3. The vehicle seat suspension according to claim 1, wherein the center bracket faces the lower rotating shaft with a gap therebetween. a rear floor bracket that spans between the lower surfaces of the rear end portions of the left and right lower rails and is fixed to the floor;
The vehicle seat suspension according to any one of claims 1 to 3, wherein the center bracket is fixed to the upper surface of the rear floor bracket. The center bracket is formed with a notch in which both sides in the left-right direction of the seat and the lower side of the seat are open, and an intermediate portion in the left-right direction of the seat of the lower rotating shaft is inserted into the notch. The vehicle seat suspension according to any one of claims 1 to 4. The center bracket includes left and right side walls that face each other in the left and right direction of the seat, an upper wall that connects the upper ends of the left and right side walls, and an upper wall that extends outward in the left and right direction of the seat from the lower ends of the left and right side walls. and left and right fixed wall parts that are extended and fixed to the floor part,
The suspension for a vehicle seat according to claim 5, wherein the cut portions are formed in each of the left and right side wall portions. Two bolts for fixing the lower rail to the floor pass through the reinforcing patch, and a portion of the reinforcing patch between the two bolts is above the seat of the lower rotating shaft. The vehicle seat suspension according to claim 2, wherein the vehicle seat suspension is arranged. a seat body portion having a seat cushion on which an occupant of a vehicle sits, and a seat back that supports the back of the occupant;
a seat belt device that restrains the occupant to the seat main body;
The vehicle seat suspension according to any one of claims 1 to 7, wherein the seat main body is connected to the left and right upper rails;
Vehicle seat with