JP2014177183A - Vehicular seat structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular seat structure capable of restraining excessive displacement while allowing the displacement by a lumber adjustment mechanism of a lower part of a suspension mat with a simple constitution.SOLUTION: A vehicular seat structure (1) of the present invention comprises a seat back frame (28) including a vertical directional frame part (28a), a suspension mat (30) connected to a vertical directional frame, a lumber adjustment mechanism (44) connected to the suspension mat under a connection position between the suspension mat and the seat back frame and a tension member (32) extended between the vertical directional frames on the lower side of the suspension mat, and a lower edge part (30d) of the suspension mat is provided with a bent member (42) extending downward in front of a tension member and bent to the rear side by passing through under a predetermined distance from the tension member, so as to be arranged for reducing the predetermined distance (DI) between the bent member and the tension member when the lower edge part of the suspension mat is displaced forward and upward.

Description

  The present invention relates to a vehicle seat structure, and more particularly to a vehicle seat structure including a seat back having a seat back frame.

Usually, a vehicle seat back is mainly composed of a seat back frame, a predetermined elastic body disposed inside the seat back frame, and a pad material provided between the elastic body and a seated occupant. Composed. As such an elastic body, a configuration is known in which a suspension mat, which is a spring assembly, is disposed inward of a seat back frame and supported by the seat back frame via a winding spring (Patent Document 1). .
In addition, a lumbar adjustment mechanism that adjusts the position of the seat back in the front-rear direction of a portion of the seat back that contacts the waist of the occupant is known in order to improve the riding comfort of the occupant seated on the seat.

JP 2006-056360 A

  Here, in the seat back employing the suspension mat, in order to adjust the lumbar, when the portion of the suspension mat corresponding to the waist of the occupant is displaced in the front-rear direction of the seat, while allowing the displacement of the suspension mat by the lumbar adjustment, It must be positioned to prevent excessive displacement of the suspension mat. However, in order to allow and position such a displacement, for example, if a guide mechanism such as a slider that guides the lower edge portion of the suspension mat and holds it in an appropriate position is provided, the vehicle will increase in weight and cost. Therefore, it is required to allow the suspension mat to be displaced and to suppress excessive displacement with a simple configuration.

  The present invention has been made to solve the above-described problems of the prior art. In a seat back having a suspension mat, the displacement of the lower edge portion of the suspension mat by the lumbar adjustment mechanism is allowed with a simple configuration. An object of the present invention is to provide a vehicle seat structure that can suppress excessive displacement.

In order to achieve the above object, the present invention provides a vehicle seat structure including a seat cushion, a seat back, and a headrest, and includes a vertical frame portion extending in the vertical direction on both the left and right sides in the seat back. A back frame, a suspension mat disposed inside the seat back frame and connected to the vertical frame of the seat back frame, and a lumbar for displacing the lower portion of the suspension mat in the seat front-rear direction so as to support the waist of the occupant An adjustment mechanism, a lumbar adjustment mechanism that is connected to the suspension mat below the connection position between the suspension mat and the vertical frame of the seat back frame, and is provided on the lower side of the suspension mat, and the vertical direction of the seat back frame Left and right between frames A tension member stretched so as to extend, and extends downward from the front of the tension member at a lower edge portion of the suspension mat, and bends to the rear side through a predetermined distance below the tension member. The formed bending member is provided, and when the lower edge portion of the suspension mat is displaced forward and upward by the lumbar adjusting mechanism, the bending member decreases a predetermined distance between the bending member and the tension member. It is characterized by being arranged like this.
In the present invention configured as above, the lumbar adjustment mechanism is below the connection position between the suspension mat and the vertical frame of the seat back frame so that the lower portion of the suspension mat is displaced in the front-rear direction of the seat. The bending member provided at the lower edge portion of the suspension mat extends downward in front of the tension member and bends to the rear side through a predetermined distance below the tension member. Displacement of the lower edge portion toward the front and upward can be allowed. Further, the bending member is arranged so that the predetermined distance between the bending member and the tension member is reduced when the lower portion of the suspension mat is displaced forward and upward by the lumbar adjustment mechanism. Even if the lower edge portion of the lower edge portion is excessively displaced forward and upward beyond a predetermined maximum overhang amount, the bending member comes into contact with the tension member, and the positional relationship between them is regulated. Therefore, it is possible to suppress the excessive displacement while permitting the displacement of the lower edge portion of the suspension mat by the lumbar adjusting mechanism with a simple configuration without increasing the weight and cost.

Further, in the present invention, preferably, the suspension mat itself extends and deforms in the left-right direction, and has linear members extending in the up-down direction at both left and right edge portions, and the lumbar adjusting mechanism is These linear members are configured to perform lumbar adjustment by displacing the linear members forward and outward with respect to the respective vertical frames of the seat back frame, and the tension member includes a horizontal portion extending in the horizontal direction, A bending portion that is bent downward on the outer side of the left and right direction portion and extends in the up and down direction, and the bending member passes below a first predetermined distance that is a predetermined distance from the left and right direction portion of the tension member, and It arrange | positions so that it may bend in the back in the 2nd predetermined distance inward with respect to the up-down direction part of a tension member.
In the present invention configured as described above, the lumbar adjusting mechanism displaces the respective linear members forward and outward with respect to the respective vertical frames of the seat back frame, and the bending member is the tension member. Since it is disposed so as to be bent backward by a first predetermined distance from the left and right direction portion and through the second predetermined distance inward with respect to the vertical direction portion of the tension member, the suspension is adjusted by the lumbar adjusting mechanism. When the left and right edge portions of the mat are displaced forward and outward with respect to the seat back frame, the lower edge portion of the suspension mat is allowed to move in both the vertical and horizontal directions of the lower edge portion of the suspension mat. Even if an excessive displacement exceeds a predetermined maximum overhang amount, the bending member moves upward and comes into contact with the left-right direction portion of the tension member, And, moved along the outside of the sheet lateral direction abut in the vertical direction part of the tension member, the positional relationship thereof with one another is restricted. Therefore, it is possible to suppress the excessive displacement while permitting the displacement of the lower edge portion of the suspension mat by the lumbar adjusting mechanism with a simple configuration without increasing the weight and cost.

  According to the present invention, in a seat back having a suspension mat, an excessive displacement can be suppressed with a simple configuration while allowing a displacement of the lower edge portion of the suspension mat by the lumbar adjustment mechanism.

It is the perspective view which looked at the external appearance structure of the sheet | seat with which the vehicle seat structure by embodiment of this invention was applied from diagonally left front and upper direction. It is the perspective view which looked at the sheet | seat to which the vehicle seat structure by embodiment of this invention was applied diagonally left front and upper direction. It is the elements on larger scale which looked at the seat back part for demonstrating the attachment structure and lumbar adjustment mechanism of the suspension mat by this embodiment from diagonally left front and upper direction. It is a partial enlarged front view of a seat back portion for explaining a suspension mat mounting structure and a lumbar adjusting mechanism according to the present embodiment. It is a side view showing a state where the amount of displacement of the lower part of the suspension mat by the lumbar adjustment mechanism according to the present embodiment is small. It is a side view which shows the state with much displacement amount of the lower part of the suspension mat by the lumbar adjustment mechanism by this embodiment. FIG. 5 is a partially enlarged front view of a portion indicated by A in FIG. 4 for explaining the relationship of arrangement between a supporting spring member and a bending member according to the present embodiment. It is a figure shown like FIG. 7 which shows an example of the contact state of the spring member for support, and a bending member when the lower edge part of a suspension mat has displaced too much.

Next, a vehicle seat structure according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, the overall configuration of a vehicle seat structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of an exterior configuration of a seat to which a vehicle seat structure according to an embodiment of the present invention is applied, viewed obliquely from the left front and above, and FIG. 2 is a vehicle seat structure according to an embodiment of the present invention. It is the perspective view which looked at from diagonally left front and upper direction.

First, as shown in FIG. 1, the vehicle seat 1 according to the present embodiment includes a seat cushion 2, a seat back 4, and a headrest 6.
Trim members 8 that cover the lower part of the seat are provided on both the left and right sides of the seat cushion 2, and on the left side of the seat, the occupants are manually operated to move the seat cushion 2 up and down. A lift lever 10, a reclining lever 12 for reclining the seat back 4, and a lumbar support lever (ratchet lever) 13 for a lumbar adjustment mechanism described later are provided.

  Next, as shown in FIGS. 1 and 2, the vehicle body floors (not shown) on both the left and right sides of the seat 1 extend in the vehicle front-rear direction and support the seat cushion frame 2 slidably in the seat front-rear direction. A slide mechanism 14 is provided. These slide mechanisms 14 are mainly composed of guide rails 16 fixed to the floor and sliders 18 slidably engaged with these guide rails 16. In addition, the seat 1 is provided with a lift mechanism 20 that connects the slider 18 of the slide mechanism 14 and the seat cushion frame 24 and moves the seat cushion 2 up and down while supporting the seat 1. As shown in FIGS. 2 and 3, the lift mechanism 20 includes a pair of left and right front link members 22 provided at the front portion of the seat and a rear side link member 23.

  Next, as shown in FIG. 2, the seat 1 includes a pair of left and right seat cushion frames 24 and a seat pan 26 provided in the seat cushion 2, and a seat back 4. A seat back frame 28 for supporting a load applied to the back 4, a suspension mat 30 and a supporting spring member 32, and a headrest frame 36 configured to be able to adjust the vertical position of the headrest 6. .

  As shown in FIG. 2, the seat back frame 28 supports the headrest frame 36 by extending the upper and lower frame portions 28 a extending in the vertical direction on both the left and right sides in the seat back 2 and connecting them. Upper frame portion 28b.

Next, referring to FIGS. 3 and 4, the structure of the suspension mat 30 disposed inside the seat back frame 28 and its mounting structure to the seat back frame 28 will be described.
FIG. 3 is a front view of the seat back portion for explaining the configuration of the suspension mat and its mounting structure and the lumbar adjustment mechanism according to the embodiment of the present invention, and FIG. 4 shows the configuration of the suspension mat according to the present embodiment and It is the elements on larger scale of the seat back part for demonstrating the attachment structure and a lumbar adjustment mechanism.

First, the configuration of the suspension mat 30 will be described.
As shown in FIGS. 3 and 4, the suspension mat 30 includes a left and right linear member 30a extending in the vertical direction at both left and right edges, a central linear member 30b extending in the vertical direction between them, and a linear shape thereof. It has a plurality of transverse spring members 30c that connect the members 30a, 30b to each other in the left-right direction of the seat. The suspension mat 30 is configured as a spring assembly in which these members 30a, 30b, and 30c are joined to each other by welding or the like. The suspension mat 30 can be extended and deformed in the left-right direction by a plurality of lateral spring members 30c.

  Further, a bending member 42 described later is attached to the lower edge portion 30d of the suspension mat 30. In the present embodiment, the bending member 42 is formed by extending the lower end of the left and right linear members 30 a described above, and constitutes the lower end portion of the suspension mat 30. The bending member 42 is not limited to one formed by extending the left and right linear members 30a, and may be attached to an appropriate location by welding or the like as a separate member. Further, as will be described later, the bending member 42 is formed so as to overlap the supporting spring member 32 in a front view.

Next, a structure for attaching the suspension mat 30 to the seat back frame 28 will be described.
The upper portion of the suspension mat 30 is connected to the seat back frame 28 by a total of two wires 40 and is supported by the seat back frame 28. Specifically, one end of each wire 40 is attached to the upper part of the left and right edges of the suspension mat 30, one on each of the left and right sides, while the other end of these wires 40 is curved and illustrated. In this way, it is hooked and attached to the vertical frame portion 28a. In the present embodiment, the upper portion of the suspension mat 30 is supported by the wire 40, whereby the lower portion of the suspension mat 30 can be displaced particularly in the seat back front-rear direction, and the lower edge portion 30d of the suspension mat 30 is a free end. It is comprised so that it may become. A lumbar adjusting mechanism 44 is connected to the lower portion of the suspension mat 30 as will be described later.

Next, the lumbar adjustment mechanism will be described with reference to FIGS.
FIG. 5 is a side view showing a state in which the amount of displacement of the lower portion of the suspension mat by the lumbar adjusting mechanism (the amount of protrusion to the occupant side) is small, and FIG. 6 is the amount of displacement of the lower portion of the suspension mat by the lumbar adjusting mechanism. It is a side view which shows a state with much (the amount of protrusion to a passenger | crew side).

First, as shown in FIGS. 3 and 4, the lumbar adjusting mechanism 44 mainly includes two cable wires 46, sleeves 48 a and 48 b that receive the cable wires 46 so as to guide them, and the cable wires 46. A take-up mechanism 50 and a ratchet lever 13.
One end of each of the two cable wires 46 is attached to the winding mechanism 50, and extends from the winding mechanism 50 to the back side of the suspension mat 30 through one sleeve 48 a. The sleeve 48a branches into two sleeves 48b as shown, and the other end of each cable wire 46 is fixed to the front end 28c of the vertical frame 28a as shown. On the other hand, the end portions 48c of the two branches 48b are respectively fixed to the left and right linear members 30a of the suspension mat 30 as shown in the figure. The fixed end portions 48c of these sleeves 48b are below both the left and right sides from the attachment position of the wire 40 to the suspension mat 30 (the position at which one end of the wire 40 above the suspension mat 30 is attached). .

  With such a configuration, when the winding mechanism 50 winds up the cable wire 46, the other end portion of each cable wire 46 fixed to the front end portion of the vertical frame portion 28a and each sleeve 48b branched into two. Accordingly, the left and right linear members 30a are displaced forward and outward with respect to the respective vertical frames 28a of the seat back frame 28. With such displacement, the lower portion of the suspension mat 30, particularly the lower edge portion 30 d serving as the free end below the suspension mat 30, for example, from the state shown in FIG. 5 to the state shown in FIG. Displace forward and upward.

Next, a mechanism for suppressing excessive displacement of the lower edge portion of the suspension mat 30 by the supporting spring member and the bending member will be described with reference to FIGS.
FIG. 7 is a partially enlarged front view of a portion indicated by A in FIG. 4 for explaining the arrangement relationship between the supporting spring member and the bending member, and FIG. 8 shows the support when the suspension mat is excessively displaced. It is a figure shown like FIG. 7 which shows an example of the contact state of a spring member and a bending member. 7 and 8, only the right side (left side in the front view) angular spring 32 and the bending member 42 are shown, but the arrangement relationship between the left side angular spring 32 and the bending member 42 is the same. The description is omitted here.

  First, as shown in FIGS. 3 and 4, in this embodiment, the supporting spring member 32 disposed on the lower side of the suspension mat 30 includes a left-right portion 32 a extending in the left-right direction and a vertical portion extending in the up-down direction. It is formed in the shape of a square spring having 32b. Both ends of the supporting spring member (square spring) 32 are connected to the vertical frame portion 28a so as to be stretched between the vertical frame portions 28a.

  As shown in FIGS. 3 and 7, the bending member 42 described above has a predetermined distance D <b> 1 from the lateral portion 32 a below the angular spring 32 in a normal state where the lumbar mechanism is not operated. And is formed so as to bend backward with respect to the vertical portion 32b through a distance of a predetermined distance D2 and inward in the sheet width direction. Here, when the lower edge portion 30d of the suspension mat 30 is displaced forward and upward by the lumbar adjusting mechanism 44, the predetermined distance D1 between the bending member 42 and the left-right direction portion 32a decreases, but the predetermined distance D1. Is set to a distance that allows such a displacement within a range of a predetermined adjustment amount of the lumbar adjustment mechanism 44. Further, as described above, the displacement of the lower edge portion 30d of the suspension mat 30 is caused by displacing the left and right linear members 30a forward and outward with respect to the respective vertical frames 28a of the seat back frame 28. However, the predetermined distance D <b> 2 is set to a distance that allows such a displacement within a range in a predetermined adjustment amount of the lumbar adjustment mechanism 44.

On the other hand, the predetermined distances D1 and D2 are such that some load is applied from the rear of the suspension mat 30, and the lower edge portion 30d of the suspension mat 30 is excessively displaced forward and upward beyond a predetermined maximum displacement. At this time, the displacement of the lower edge portion 30d of the suspension mat 30 is set to a distance that can be regulated. That is, as shown in FIG. 8, when the lower edge portion 30d of the suspension mat 30 is excessively displaced forward and upward, the lower end portion of the bending member 42 comes into contact with the left-right direction portion 32a of the angular spring 32, and the bending member Thus, the upward displacement of the suspension mat 30 is suppressed, whereby excessive displacement of the lower edge portion 30d of the suspension mat 30 is suppressed.
Further, as described above, the lower portion of the suspension mat 30 is displaced by displacing the left and right linear members 30a forward and outward with respect to the respective vertical frames 28a of the seat back frame 28. Even when such forward and outward displacement is excessive, as shown in FIG. 8, the bending member 42 abuts on the vertical portion 32 b of the angular spring 32, and the outward direction of the bending member 42. Thus, excessive displacement of the lower edge portion 30d of the suspension mat 30 is suppressed.

  Here, in this embodiment, the square spring 32 is formed of a steel material thicker than the left and right linear members 30a and the bending member 42, and the strength thereof is increased. Further, both end portions of the square spring 32 are connected and stretched to the vertical frame portion 28a. Therefore, even when the bending member 42 abuts as described above, the angular spring 32 functions as a fixed end so that rigidity capable of suppressing excessive displacement of the bending member 42 and the lower edge portion of the suspension mat 30 can be obtained. ing. The bending member 42 is also formed to have strength and rigidity capable of suppressing the displacement of the lower portion of the suspension mat 30 when excessive displacement as described above occurs.

Next, the effect of the sheet structure according to the embodiment of the present invention will be described.
First, in the present embodiment, the lumbar adjusting mechanism 44 is connected to the suspension mat 30 so as to displace the suspension mat in the front-rear direction of the seat below the connection position between the suspension mat 30 and the seat back frame 28. A bending member 42 provided on the lower edge portion 30d of the mat 30 extends downward in front of the supporting spring member 32 and is bent backward from the supporting spring member 32 through a predetermined distance D1. Therefore, the lumbar adjusting mechanism 44 can allow the front edge and the upper edge of the lower edge portion 30d which is the lower free end of the suspension mat 30 to be displaced. Further, when the lower edge portion 30d of the suspension mat 30 is displaced forward and upward by the lumbar adjusting mechanism 44, the bending member 42 decreases the predetermined distance D1 between the bending member 42 and the supporting spring member 32. Therefore, even if the lower edge portion 30d of the suspension mat 30 attempts to displace excessively forward and upward beyond a predetermined maximum overhang amount, the bending member 42 contacts the supporting spring member 32. In contact with each other, their positional relationship is regulated. Therefore, the excessive displacement can be suppressed while allowing the displacement of the lower edge portion 30d of the suspension mat 30 by the lumbar adjustment mechanism 44 with a simple configuration without increasing the weight and cost.

  In the present embodiment, the lumbar adjusting mechanism 44 displaces the respective left and right linear members 30a forward and outward with respect to the respective vertical frames 30a of the seat back frame 30, and the bending member 42 is Bends a predetermined distance D1 from the left-right direction portion 32a of the support spring member 32 and bends backward through the inside in the seat width direction by a predetermined distance D1 with respect to the vertical direction portion 32b of the support spring member 32. Even if the left and right linear members 30a of the left and right edge portions of the suspension mat 30 are displaced forward and outward relative to the vertical frame 30a of the seat back frame 28 by the lumbar adjustment mechanism 44, the suspension mat is arranged. The lower part of the suspension mat 30 is allowed to move both in the vertical direction and the horizontal direction in the lower part of the suspension 30. Even if the minute is excessively displaced beyond the predetermined maximum overhang amount, the bending member 42 moves upward and contacts the left and right portion of the tension member, and also moves outward in the left and right direction of the seat. Then, they come into contact with the vertical portion 32b of the tension member 32, and their positional relationship is regulated. Therefore, it is possible to suppress the excessive displacement while permitting the displacement of the lower portion of the suspension mat 30 by the lumbar adjustment mechanism 44 with a simple configuration without increasing the weight and cost.

  In this embodiment, when the left and right edges of the upper part of the suspension mat 30 are connected to the seat back frame 28a in a smaller number than in the prior art, the left and right edges of the upper part are connected to the seat back frame 28a. Since the degree is small, it is more effective to suppress the excessive displacement of the lower portion of the suspension mat 30 by the support spring member 32 and the bending member 42 as described above. Further, since the left and right end portions of the suspension mat 30 are connected by the wire 40, the weight can be further reduced as compared with the case where a winding spring is used.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 4 Seat back 6 Headrest 28 Seat back frame 28a Vertical frame 28c of seat back frame Front end 30 of vertical frame Suspension mat 30a Left and right linear members (linear members) of the suspension mat
30d Lower edge 32 of suspension mat Supporting spring member / square spring (tension member)
32a Left and right portion 32b of supporting spring member 40 Up and down portion 40 of supporting spring member Suspension mat mounting wire 42 Suspension mat bending member 44 Lumbar adjustment mechanism 46 Lumbar adjustment mechanism cable wires 48a and 48b Sleeve 48c Fixed end D1 of the sleeve Vertical distance (first predetermined distance) between the supporting spring member and the lower end of the bending member
D2 Seat width direction distance (second predetermined distance) between the supporting spring member and the bending member

Claims (2)

A vehicle seat structure including a seat cushion, a seat back, and a headrest,
A seat back frame including a vertical frame portion extending in the vertical direction on both the left and right sides in the seat back;
A suspension mat disposed inside the seat back frame and connected to the vertical frame of the seat back frame;
A lumbar adjustment mechanism for displacing a lower portion of the suspension mat in the front-rear direction of the seat so as to support the occupant's waist, wherein the lumbar adjustment mechanism is below the connecting position of the suspension mat and the vertical frame of the seat back frame. A lumbar adjustment mechanism connected to the suspension mat;
A tension member provided on the lower side of the suspension mat and stretched between the vertical frames of the seat back frame so as to extend in the horizontal direction;
The lower edge portion of the suspension mat is provided with a bending member that extends downward in front of the tension member and is bent backward by a predetermined distance from the tension member. The member is arranged so that the predetermined distance between the bending member and the tension member decreases when the lower edge portion of the suspension mat is displaced forward and upward by the lumbar adjustment mechanism. A vehicle seat structure characterized by the above. The suspension mat has a linear member that itself extends and deforms in the left-right direction, and extends in the up-down direction at both right and left edge portions,
The lumbar adjustment mechanism is configured to perform lumbar adjustment by displacing these linear members forward and outward with respect to the respective vertical frames of the seat back frame,
The tension member has a left-right direction portion extending in the left-right direction, and a vertical direction portion bent downward on the outer side of the left-right direction portion and extending in the up-down direction,
The bending member passes below a first predetermined distance, which is the predetermined distance, from the left-right direction portion of the tension member, and passes through a second predetermined distance inward relative to the vertical direction portion of the tension member. The vehicle seat structure according to claim 1, wherein the vehicle seat structure is disposed so as to be bent.

Images