Seat for a vehicle

Abstract

The utility model discloses a kind of vehicle seats without ensuring the space of cushion to the extent above required at the front side of seat and can inhibit back sliding when tilting adjustment. The vehicle seat (10) has: tilting adjuster (18), seat backrest (14) is fixed on it and is linked to cushion (12) and the seat backrest (14), and for adjusting the dumping angle of seat backrest (14) relative to cushion (12);Guide rail (20) is arranged at the side of cushion (12), and is formed as the center of tilting adjustment center is approximately circular arc, and is linked with tilting adjuster (18) in a way that can move along track, and tilting adjuster (18) is guided along track in a way that tilting adjustment rotation center is located at the position corresponding to hip point (HP) of seated occupant when tilting adjustment.

Description

Technical Field

[0001] This utility model relates to a seat for transportation vehicles. Background Technology

[0002] In general, in vehicle seats, such as front seats in cars, the seat back can be reclined by operating a tilt adjustment mechanism.

[0003] In the prior art document 1 below, a vehicle seat is disclosed that allows the seat back to recline by operating a tilt adjuster. To briefly describe it, this vehicle seat includes: a tilt adjuster consisting of a fixed side and a rotating side, with the fixed side fixed to a base component support; a seat back frame and a seat cushion frame, each connected to the rotating part of the tilt adjuster via a connecting rod or the like. Therefore, in this vehicle seat, when the seat back is tilted back while the occupant's hip point is not aligned with the rotation center of the seat back, the phenomenon of the occupant's clothing slipping upwards on their back (hereinafter referred to as "back slippage") is suppressed.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2014-180983 Utility Model Content

[0007] The problem to be solved by the utility model

[0008] However, in the aforementioned prior art vehicle seats, as the seat back is tilted back via a tilt adjuster, the seat back and its support are tilted backward, and the seat cushion frame is moved forward. Therefore, there is a problem that a space needs to be reserved in front of the seat to accommodate the amount of movement of the seat cushion frame.

[0009] The present invention takes into account the above facts and aims to provide a vehicle seat that does not require a seat cushion space of more than the required degree at the front side of the seat and can suppress back slippage during tilt adjustment.

[0010] Methods for solving problems

[0011] The vehicle seat described in technical solution 1 includes: a tilt adjuster on which a seat back is fixed and a seat cushion is connected to the seat back, and for adjusting the tilt angle of the seat back relative to the seat cushion; and a guide rail disposed on the side of the seat cushion and formed in a generally arc shape centered on the tilt adjustment center, and connected to the tilt adjuster in such a way that the tilt adjuster can move along the rail, and guides the tilt adjuster along the rail in such a way that the tilt adjustment rotation center is located at a position corresponding to the hip point of the seated occupant during tilt adjustment.

[0012] According to the present invention described in technical solution 1, since the seat back is fixed to the tilt adjuster, when the tilt adjuster moves along the generally arc-shaped guide rail located on the side of the seat cushion, the seat back moves together with the tilt adjuster relative to the seat cushion. Therefore, although the seat back is tilted, the seat cushion itself does not move in the fore-and-aft direction due to the tilt adjustment. Thus, there is no need to ensure space for seat cushion movement on the front side of the seat cushion.

[0013] Furthermore, as the tilt adjuster moves along the guide rail, which is formed in a roughly arc shape, the center of the seat back tilt adjustment is located at a position corresponding to the hip point of the seated occupant. Therefore, even when tilting, there is virtually no relative movement between the seat back and the seated occupant's back. Consequently, the so-called back slippage problem does not occur.

[0014] Utility Model Effect

[0015] As explained above, the vehicle seat of the present invention described in technical solution 1 has the following beneficial effects: it does not require ensuring the space of the seat cushion to a greater extent than necessary, and it can suppress back slippage during tilt adjustment. Attached Figure Description

[0016] Figure 1 This is a side view showing the basic structure of the vehicle seat according to this embodiment.

[0017] Figure 2 for Figure 1 The image shows a top view of the vehicle's seats.

[0018] Figure 3(A) is Figure 1 The following is a side view of the vehicle seat in normal use, and Figure 3(B) is a side view of the vehicle seat when fully reclined. Detailed Implementation

[0019] The following uses Figures 1 to 3(A)Figure 3(B) illustrates the vehicle seat 10 according to this embodiment. Additionally, the arrow UP, appropriately shown in each figure, indicates the upper side of the vehicle, and the arrow IN indicates the inner side in the width direction of the vehicle.

[0020] (Overall structure of vehicle seat 10)

[0021] like Figure 1 As shown, the vehicle seat 10 according to this embodiment is configured to include: a seat cushion 12, which is arranged parallel to the vehicle floor and supports the occupant's buttocks and thighs; and a seat back 14, which is erected on the rear end side of the seat cushion 12 and supports the occupant's back.

[0022] like Figure 1 as well as Figure 2 As shown, a pair of metal side frames 16 are provided on both sides of the seat cushion 12. Each side frame 16 is formed into a generally rectangular flat plate and is arranged with the length direction of the seat front-to-back direction and the thickness direction of the plate in the seat width direction. In the seat back 14, a metal seat back frame 17 is provided, which is formed into a generally inverted U-shape when viewed from the front and from above.

[0023] At the lower end of the aforementioned side frame 16, a pair of front and rear fixing brackets 23 are provided (see reference). Figure 1 The mounting bracket 23 is supported on a seat rail fixed to a vehicle floor (not shown) in a forward and backward movable manner, thereby allowing the vehicle seat 10 to be supported on the vehicle floor in a manner that enables adjustment of its forward and backward position.

[0024] (Main structural components of a vehicle seat)

[0025] Next, the main structural components of the vehicle seat 10 will be described in detail.

[0026] The aforementioned vehicle seat 10 is configured to be tiltable using a tilt adjustment mechanism. Specifically, it is configured such that the tilt adjustment angle of the seat back 14 can be adjusted by guiding the tilt adjuster 18, which is located on the side of the seat back frame 17, along the guide rail 20, which is laid on the side of the side frame 16 of the seat cushion 12.

[0027] First, the tilt adjuster 18 will be explained. For example... Figure 1As shown, tilt adjusters 18 are respectively disposed on the outer sides of the lower part of both sides of the seat back frame 17. Each tilt adjuster 18 is configured as a plate-shaped component that is generally J-shaped when viewed from the side of the seat. The upper end of the tilt adjuster 18 is attached (fixed) to three locations on the outer side of the lower part of the seat back frame 17 by bolts 21 and weld nuts (not shown). In addition, a guide rail box (slider) 24, which is generally box-shaped, is attached to the inner side of the lower end of the tilt adjuster 18 by a plurality of bolts 22. Therefore, the guide rail box 24 and the tilt adjuster 18 are integrated.

[0028] On the other hand, the guide rail 20 is disposed on the outer surface of the aforementioned side frame 16. Furthermore, the guide rail 20 is formed into an approximately quarter-circle shape when viewed from the side of the seat. One end of the guide rail 20 is disposed at the upper edge of the middle portion of the side frame 16 in the longitudinal direction, and the other end is disposed at the rear end of the side frame 16. The guide rail 20 is formed with a longitudinal cross-sectional shape approximately "U"-shaped (with two flanges). The guide rail housing 24 of the tilt adjuster 18 is fitted onto the guide rail 20 in a manner that allows it to slide along the track.

[0029] like Figure 1 as well as Figure 2 As shown, a straight rod-shaped bar 32 is mounted on the left and right side frames 16. A drive motor 36 is connected to the axial middle portion of the bar 32. The motor 36 is mounted on a support frame 40 erected between the left and right side frames 16. The output shaft of the motor 36 meshes with an input gear (not shown) located approximately at the axial middle portion of the bar 32 via a reduction gear (not shown). Therefore, when the motor 36 drives the rotation, the bar 32 rotates clockwise or counterclockwise around its axis.

[0030] Furthermore, on the outer side of the left and right side frames 16 in the seat width direction, there are support brackets 26 that appear to be cap-shaped when viewed from the side. The middle portion 26A of the support bracket 26 is arranged to protrude towards the underside of the seat, and a straight rod-shaped feed screw 28 is arranged through the middle portion 26A along the side frame 16. A hinge bracket 30 is mounted on the rear end of the feed screw 28, and the hinge bracket 30 is connected in a manner that allows it to rotate freely about a support shaft 31 that is upright and mounted on the lower part of the tilt adjuster 18. In addition, an anti-slip member is provided on the front end of the feed screw 28.

[0031] Inside the middle portion 26A of the aforementioned support bracket 26, a worm gear 34 is disposed, externally mounted on the axial middle portion of the feed screw 28. The worm gear 34 meshes with the feed screw 28, and also meshes with the aforementioned rod 32. Therefore, when the rod 32 rotates about its axis, its rotational force is transmitted to the feed screw 28 after being transmitted to the worm gear 34.

[0032] Here, the center of curvature O of the guide rail 20 is set so as to roughly correspond to the hip point (HP) of the seated occupant (a standard-sized dummy such as AM50). In other words, by allowing the tilt adjuster 18 to rotate freely around the pivot 31, the center of rotation of the tilt adjuster 18 is set to the pivot 31, and in order to allow the tilt adjuster 18 to move along the arc-shaped guide rail 20, another center of rotation is set at the front side of the seat of the tilt adjuster 18 via the rod 32, so that the center of rotation of the tilt adjustment during tilt adjustment is set in a position corresponding to the hip point (HP) of the seated occupant.

[0033] (The role and effects of the implementation method)

[0034] The function and effects of this embodiment will be explained below.

[0035] Figure 3(A) shows the normal operating state of the vehicle seat 10. From this state, when the occupant performs a tilt adjustment operation to recline the seat back 14, the motor 36 rotates forward, causing the lever 32 to rotate around its axis (towards...). Figure 2 The motor 36 is driven to rotate in the direction of arrow A. Furthermore, when the lever 32 rotates, its rotational force is transmitted from the worm gear 34 to the feed screw 28, causing the feed screw 28 to move forward towards the front of the seat (in the direction of arrow B), as shown in Figure 3(B). This pulls the tilt adjuster 18, causing the guide rail box 24 to move forward and upward along the guide rail 20 towards the front and top of the seat (in the direction of arrow C in Figure 3(A)). As a result, the seat back 14 tilts backward in the direction of arrow D while maintaining the occupant's hip point (HP) position. When the seat back 14 is reset, the motor 36 is driven in reverse.

[0036] As described above, in this embodiment, a guide rail 20, which is approximately arc-shaped when viewed from the side, is provided on the side of the seat cushion 12. The center of curvature O of the guide rail 20 is positioned approximately equal to the hip point HP of the seated occupant. Furthermore, the tilt adjuster 18, which is J-shaped when viewed from the side, moves along the guide rail 20 under the driving force of the motor 36. Therefore, even when the seat back 14 is tilted back during tilt adjustment, there is virtually no relative movement between the front surface of the seat back 14 and the back of the seated occupant. Thus, the so-called back slippage problem is avoided.

[0037] Furthermore, when the seat backrest 14 is tilted, the seat backrest 14 and the tilt adjuster 18 move together along the guide rail 20. Therefore, although the seat backrest 14 is tilted, the seat cushion 12 itself does not move forward or backward due to the tilt adjustment. Thus, there is no need to ensure space for movement of the seat cushion 12 on the side further forward of the seat.

[0038] As explained above, according to this embodiment, it is not necessary to ensure the space of the seat cushion 12 to the required extent on the front side of the seat, and back slippage can be suppressed during tilt adjustment.

[0039] In addition to the effects described above, this embodiment also provides the following benefits. Specifically, because the tilt adjuster 18, which is approximately J-shaped when viewed from the side, has a guide rail 20 on the side of the side frame 16 and moves along this guide rail 20, the aforementioned device structure components do not extend outwards in the seat width direction of the seat cushion 12. Therefore, the likelihood of the device structure components contacting the human body (especially the buttocks) when the occupant sits down is extremely low. This structure allows for unrestricted occupant height and also eliminates the need to significantly increase the seat width of the vehicle seat 10.

[0040] Furthermore, although an arc-shaped guide rail 20 is used in this embodiment, it is not limited to this; any guide rail formed into a generally arc shape is acceptable. For example, it can also be a guide rail formed by combining multiple arc shapes with different radii of curvature, as long as the shape can suppress backslip. Alternatively, instead of using a fixed radius of curvature, a guide rail formed by combining straight lines and curves into a generally arc shape can be used. By adopting this approach, a tilt adjustment action with a higher degree of freedom can be achieved.

[0041] Symbol Explanation

[0042] 10…Seat for vehicles; 12…Seat cushion; 14…Seat back; 16…Side frame; 18…Tilt adjuster; 20…Guide rail; HP…Hip point.

Claims

1. A seat for a vehicle, characterized in that, have: A tilt adjuster, on which a seat back is fixed and a seat cushion is connected to the seat back, and is used to adjust the tilt angle of the seat back relative to the seat cushion. A guide rail is provided on the side of the seat cushion and is formed in a generally arc shape centered on the tilt adjustment center. It is connected to the tilt adjuster in such a way that the tilt adjuster can move along the rail, and guides the tilt adjuster along the rail in such a way that the tilt adjustment rotation center is located at a position corresponding to the hip point of the seated occupant during tilt adjustment.

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