JP6835634B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat.

In recent years, a technique has been developed for using a net member as a cloth spring for a cushion member of a vehicle seat. For example, in Patent Document 1 below, regarding a seat cushion on which an occupant sits, a pair of side frames, a U-shaped pipe frame arranged between the side frames, and a cloth spring (net) stretched between the pipe frames. The material) and the vehicle seat structure having the material) are disclosed. As described above, by using the cloth spring as the cushion member, the weight of the cushion member can be reduced as compared with the urethane pad, the metal spring, or the like. Further, in the configuration disclosed in Patent Document 1, the tension of the cloth spring is secured by using a pipe frame having high rigidity.

By the way, when the cloth spring is used as described above, the tension of the cloth spring can be secured in the direction in which the cloth spring is laid. However, the end portion of the cloth spring is a free end in the direction in which the cloth spring is bridged (crossing direction) and the direction orthogonal to the plane of the cloth spring. In the direction in which the free ends of the cloth springs face each other, tension does not act even if a load is applied due to the seating of the occupant, and it is difficult to regulate the movement of the seated occupant. That is, it is difficult to control the deformation of the cloth spring in the direction orthogonal to the bridging direction of the cloth spring.

JP-A-2015-20596

In consideration of the above problems, the present invention obtains a vehicle seat capable of changing the amount of deformation of the cloth spring member with respect to a load from a seated occupant even in a direction orthogonal to the bridging direction in the plane of the cloth spring member. With the goal.

The vehicle seat of the first aspect of the present invention comprises a pair of frame members that form at least one skeleton of a seat cushion and a seat back and are spaced apart from each other at positions surrounding a seat area that supports the occupant. It is bridged between the pair of frame members so as to cover the seat area, and the length of the bridged direction at least one end side in the extending direction of the frame member is the center of the extending direction of the frame member. A cloth spring member having elasticity, which is shorter than the length in the bridged direction in the portion, is provided.

In the vehicle seat of the first aspect, a pair of frame members are arranged at positions surrounding the seat area supporting the occupant at intervals from each other. The pair of frame members form the skeleton of at least one of the seat cushion and the seat back. The cloth spring member has elasticity and is bridged between a pair of frame members so as to cover the seat area. The length of the cloth spring member in the spanning direction at least on one end side in the extending direction of the frame member is shorter than the length of the bridging direction in the central portion of the extending direction of the frame member. As a result, the elastic modulus of one end side of the cloth spring member is higher than that of the central portion. The elastic modulus here means Young's modulus. By making the elastic modulus on one end side of the cloth spring member higher than that in the central portion in this way, the cloth spring member is less likely to be deformed even when a load from the seated occupant is applied on the one end side, and the amount of deformation can be reduced. It can be made smaller.
The "length in the spanned direction" of the cloth spring member in the present invention means the length of the portion where the cloth spring member is in a crossed state. That is, it means the length of the portion where the elastic force can be exerted in the state where the cloth spring member is stretched.

In the vehicle seat of the second aspect of the present invention, the seat region includes a seat region that supports the thighs of the occupant from below, and the pair of frame members are located at positions surrounding the seat region. The length of the cloth spring member bridged between the cushion front-rear frames, including a pair of cushion front-rear frames extending in the seat width direction at intervals in the seat front-rear direction, is the seat width direction. It becomes shorter from the center to the outside in the seat width direction.

In the vehicle seat of the second aspect , the pair of frame members extend in the seat width direction with a space in the front-rear direction of the seat at a position surrounding the seat surface region that supports the thighs of the occupant from below. ing. The length of the cloth spring member straddled in the front-rear direction of the seat becomes shorter from the central portion in the seat width direction to the outer side in the seat width direction. Therefore, the elastic modulus of the cloth spring member is higher on the outside in the seat width direction than in the center in the seat width direction, and the amount of deformation due to the load from the seated occupant is on the outside in the seat width direction than in the center in the seat width direction. It becomes smaller. This makes it possible to regulate the movement of the seated occupant in the seat width direction.

In the vehicle seat of the third aspect of the present invention, the seat region includes a seat region that supports the thighs of the occupant from below, and the pair of frame members are located at positions surrounding the seat region. The length in the seat width direction of the cloth spring member, which includes a pair of cushion side frames extending in the front-rear direction of the seat at intervals in the seat width direction and is bridged between the cushion side frames, is from the rear of the seat. It becomes longer toward the front of the seat.

In the vehicle seat of the third aspect , the pair of frame members extend in the front-rear direction of the seat at a position surrounding the seat surface region that supports the thighs of the occupant from below, with a space between them in the seat width direction. ing. The cloth spring member spanned in the seat width direction has a long length from the rear of the seat to the front of the seat, and has a large elastic modulus on the rear side of the seat. Since the load from the seated occupant to the cloth spring member is larger on the buttocks side than on the thigh side, the cloth spring member can stably receive the load on the seated occupant by increasing the elastic modulus on the rear side of the seat. ..

In the vehicle seat of the fourth aspect of the present invention, a portion whose height in the vertical direction of the seat is lower than both ends in the width direction of the seat is formed at least on the rear side of the seat of the cloth spring member.

In the vehicle seat of the fourth aspect, a portion whose height in the vertical direction of the seat is lower than both ends in the width direction of the seat is formed at least on the rear side of the seat of the cloth spring member. In this portion where the height in the vertical direction of the seat is low, the deformation start position (deflection start position) with respect to the load from the seated occupant is lower than both ends in the seat width direction. Therefore, at least the seating pressure on the buttocks side of the seated occupant is increased. It can be reduced locally.

In the vehicle seat of the fifth aspect of the present invention, the seat region includes a back region that supports the back of the occupant, and the pair of frame members are spaced apart from each other in the vertical direction of the seat at positions surrounding the back region. The length of the cloth spring member bridged between the upper and lower back frames, including the upper and lower back frames extending in the seat width direction, is from the central portion in the seat width direction to the outside in the seat width direction. Becomes shorter.

In the vehicle seat of the fifth aspect , the pair of frame members extend in the seat width direction at a position surrounding the back region supporting the back of the occupant at intervals in the vertical direction of the seat. Then, the length of the cloth spring member bridged in the seat width direction becomes shorter from the central portion in the seat width direction to the outer side in the seat width direction. Therefore, the elastic modulus of the cloth spring member is higher on the outside in the seat width direction than in the center in the seat width direction, and the amount of deformation due to the load from the seated occupant is on the outside in the seat width direction than in the center in the seat width direction. It becomes smaller. This makes it possible to regulate the movement of the seated occupant in the seat width direction.

In the vehicle seat of the sixth aspect of the present invention, the seat region includes a back region that supports the back of the occupant, and the pair of frame members are spaced apart from each other in the seat width direction at positions surrounding the back region. The length of the cloth spring member in the seat width direction, which includes the back side frame extending in the vertical direction of the seat and is bridged between the back side frames, increases from the lower side of the seat to the upper side of the seat.

In the vehicle seat of the sixth aspect , the pair of frame members extend in the vertical direction of the seat at a position surrounding the back region supporting the back of the occupant at intervals in the width direction of the seat. The cloth spring member bridged in the seat width direction has a long length from the lower side of the seat to the upper side of the seat, and has a small elastic modulus on the upper side of the seat. By reducing the elastic modulus on the upper side of the seat in this way, it is possible to improve the cushioning performance of the seated occupant at the time of the backrest.

In the vehicle seat of the seventh aspect of the present invention, the cloth spring member is formed with an annular portion sewn by folding back the end side of the cloth spring member along the frame member, and is inserted through the annular portion. Further, a wire for supporting the end side of the cloth spring member and a mounting member for attaching the wire to the frame member are further provided.

The cloth spring member of the vehicle seat of the seventh aspect is formed with an annular portion sewn by folding back the end edge along the frame member. By inserting the wire through the annular portion, the end edge of the cloth spring member can be easily supported. Further, by attaching the wire to the frame member by the attachment member, the cloth spring member can be easily attached to the frame member via the wire.

In the vehicle seat of the eighth aspect of the present invention, the wires are arranged in pairs at intervals in the seat width direction, and the wires are arranged on the rear side of the seat toward the lower side of the seat when viewed from the seat width direction. A convex curved portion is formed.

In the vehicle seat of the eighth aspect, a curved portion that is convex toward the lower side of the seat when viewed from the seat width direction is formed on the rear side of the seat of the wire. Therefore, in the portion corresponding to the curved portion of the wire of the cloth spring member, the buttocks of the seated occupant fit better, and the movement of the seated occupant in the front-rear direction can be restricted.

According to the vehicle seat of the first aspect of the present invention, the amount of deformation of one end side or both end side of the cloth spring member due to the load from the seated occupant is smaller than that of the central portion in the direction orthogonal to the bridging direction. Can be done.

According to the vehicle seat of the second aspect of the present invention, the movement of the seated occupant in the seat width direction can be regulated by increasing the elastic modulus of the cloth spring member at both ends in the seat width direction.

According to the vehicle seat of the third aspect of the present invention, by increasing the elastic modulus of the cloth spring member on the rear side of the seat, the cloth spring member can stably receive the load of the seated occupant.

According to the vehicle seat of the fourth aspect of the present invention, the sitting pressure on the buttocks side of the seated occupant can be locally reduced.

According to the vehicle seat of the fifth aspect of the present invention, the movement of the seated occupant in the seat width direction can be restricted by increasing the elastic modulus of the cloth spring member at both ends in the seat width direction.

According to the vehicle seat of the sixth aspect of the present invention, the cushioning performance when the seated occupant is backrest can be improved by reducing the elastic modulus of the cloth spring member on the upper side of the seat.

According to the vehicle seat of the seventh aspect of the present invention, the cloth spring member can be easily attached to the frame member.

According to the vehicle seat of the eighth aspect of the present invention, the movement of the seated occupant in the front-rear direction can be restricted.

It is an overall schematic perspective view of the vehicle seat and the cloth spring unit which concerns on 1st Embodiment. It is a perspective view of the cloth spring unit of the vehicle seat which concerns on 1st Embodiment. It is an exploded perspective view of the cloth spring unit of the vehicle seat which concerns on 1st Embodiment. It is a top view of the cloth spring unit of the vehicle seat which concerns on 1st Embodiment. It is an overall schematic perspective view of the vehicle seat and the cloth spring unit which concerns on 2nd Embodiment. It is a perspective view of the cloth spring unit of the vehicle seat which concerns on 2nd Embodiment. It is an exploded perspective view of the cloth spring unit of the vehicle seat which concerns on 1st Embodiment. (A) It is a top view of the cloth spring unit of the vehicle seat which concerns on 3rd Embodiment. (B) It is a figure which looked at the cloth spring unit of FIG. 8 (A) from the direction of arrow 8B. (C) The cloth spring unit of FIG. 8A is a view seen from the direction of arrow 8C. It is a perspective view which shows the modification of the cloth spring unit of 3rd Embodiment. It is a top view which shows the other modification of the cloth spring unit of 3rd Embodiment. (A) It is a top view of the cloth spring unit of the vehicle seat which concerns on 4th Embodiment. (B) It is a figure which looked at the cloth spring unit of FIG. 11 (A) from the direction of arrow 11B. It is a top view of the modification of the cloth spring unit of the vehicle seat which concerns on 4th Embodiment. It is a top view of the modification of the cloth spring unit of the vehicle seat which concerns on 4th Embodiment. (A) It is a top view of the cloth spring unit of the vehicle seat which concerns on 4th Embodiment. (B) It is a figure which looked at the cloth spring unit of FIG. 14 (A) from the direction of arrow 14B. It is a top view of the modification of the cloth spring unit of the vehicle seat which concerns on 4th Embodiment. (A) It is a top view of the cloth spring unit of the vehicle seat which concerns on other embodiment. (B) is a view of the cloth spring unit of FIG. 16 (A) viewed from the direction of arrow 16B. (C) The cloth spring unit of FIG. 16A is a view seen from the direction of arrow 16C. (D) is a view of the cloth spring unit of FIG. 16 (A) seen from the direction of arrow 16D. (A) It is a top view of the cloth spring unit of the vehicle seat which concerns on other embodiment. (B) It is a figure which looked at the cloth spring unit of FIG. 17 (A) from the direction of arrow 17B. (C) The cloth spring unit of FIG. 17A is a view seen from the direction of arrow 17C. (D) is a view of the cloth spring unit of FIG. 17 (A) seen from the direction of arrow 17D.

[First Embodiment]

Hereinafter, the first embodiment of the vehicle seat according to the present invention will be described with reference to FIGS. 1 to 4. In these figures, the arrow FR indicates the front side in the front-rear direction of the seat, the arrow W indicates the width direction of the seat, and the arrow UP indicates the upper side in the vertical direction of the seat.

As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 12 on which the occupant sits, and a seat back 40 standing at the rear end of the seat cushion 12 to support the occupant's upper body. There is. The seat cushion 12 supports the thighs of the occupant from below.

A pair of cushion front and rear frames 14 are arranged on both ends of the seat cushion 12 in the front and rear direction of the seat. The cushion front-rear frame 14 is arranged on both sides of the seat front-rear direction surrounding the occupant's seat surface area 17 at intervals from each other as an example of the seat area. The cushion front and rear frames 14 extend along the seat width direction to form the skeleton of the seat cushion 12. The front side of the cushion front and rear frame 14 is the front cushion frame 14A, and the rear side is the rear cushion frame 14B. A cloth spring unit 20 is bridged between the pair of cushion front and rear frames 14.

As shown in FIG. 2, the cloth spring unit 20 includes a cloth spring member 22, a first wire 30, a second wire 32, and a hook 34.

The cloth spring member 22 is made of an elastic cloth material such as an elastic woven fabric, and has a cloth spring main body portion 24, one end portion 26, and the other end portion 28 as shown in FIG. .. One end 26 is arranged on the front side of the seat and the other end 28 is arranged on the rear side of the seat with the cloth spring main body 24 interposed therebetween.

The one end portion 26 is folded back toward the other end portion 28 side by the folding line 26A, and is sewn to the cloth spring main body portion 24 by the sewing line 26B as shown in FIG. An annular portion 26C is sewn by the cloth spring main body portion 24 and one end portion 26 on the folding line 26A side of the sewing line 26B. An opening 23 is formed at a position corresponding to the central portion of the folding line 26A in the extending direction.

As shown in FIG. 3, the other end 28 is formed on both sides in the seat width direction with the notch 27 formed in the center in the seat width direction interposed therebetween. The other end 28 is inclined so that the outer side in the seat width direction faces the one end 26 side in a plan view. The other end 28 is folded back toward the one end 26 side by the folding line 28A, and is sewn to the cloth spring main body 24 by the sewing line 28B as shown in FIG. An annular portion 28C is sewn on the other end 28 side of the sewing line 28B by the cloth spring main body 24 and the other end 28. The folding line 28A forms the other end side 22C of the cloth spring member 22, which will be described later.

As shown in FIG. 2, the cloth spring member 22 is arranged on one end side 22A arranged on the front side of the seat, side end sides 22B arranged on both sides in the seat width direction, and the rear side of the seat as the outer edge in a plan view. It has the other end to be. The one end side 22A is arranged along the seat width direction, and the side end side 22B is arranged along the seat front-rear direction. The other end side 22C is formed at a position along the folding line 28A, and is inclined so that the outside in the seat width direction faces the front of the seat.

A first wire 30 is attached to the annular portion 26C of the cloth spring member 22. As shown in FIG. 3, the first wire 30 has an insertion portion 30A and a connecting portion 30B bent from both ends of the insertion portion 30A. The insertion portion 30A is inserted through the annular portion 26C, and the extension portion 30B extends in the front-rear direction of the seat on the outside of the cloth spring member 22. The first wire 30 is provided on both sides of the opening 23.

A hook 34 is provided at each tip of the overhanging portion 30B. The hook 34 has a hook shape and is fastened to the front cushion frame 14A. The hooks 34 provided on the bridges 30B adjacent to each other with the opening 23 interposed therebetween are connected by the connecting portion 34A.

A second wire 32 is attached to the annular portion 28C of the cloth spring member 22. As shown in FIG. 3, the second wire 32 has an insertion portion 32A and a connecting portion 32B bent from both ends of the insertion portion 32A. The insertion portion 32A is inserted through the annular portion 28C, and the extension portion 32B extends in the front-rear direction of the seat on the outside of the cloth spring member 22. The second wire 32 is provided on both sides of the notch 27. The length of the overhanging portion 32B arranged on the center side in the seat width direction is shorter than the length of the overhanging portion 32B arranged on the outside in the seat width direction.

A hook 34 is provided at each tip of the overhanging portion 32B. The hook 34 has a hook shape and is fastened to the rear cushion frame 14B. The tips of the hooks 34 of the second wires 32 are connected to each other by the connecting portion 34B. Further, the hooks 34 provided on the bridge portions 32B adjacent to each other with the notch 27 interposed therebetween are connected by the connecting portion 34A.

One end 26 side of the cloth spring member 22 is attached to the front cushion frame 14A via the first wire 30 and the hook 34. Further, the other end 28 side is attached to the rear cushion frame 14B via the second wire 32 and the hook 34. That is, the cloth spring member 22 is bridged between the front cushion frame 14A and the rear cushion frame 14B. As shown in FIG. 4, in the bridging direction of the cloth spring member 22, the length L1 of one end side 22A is shorter than the length L2 of the intermediate portion in the seat width direction.
The "length in the bridging direction" of the cloth spring member 22 in the present invention is the length of the portion in which the cloth spring member 22 is crossed, that is, in the state where the cloth spring member 22 is bridged. It means the length of the part that can exert elastic force. Therefore, for example, even if the other end 28 side of the cloth spring member 22 extends rearward from the second wire 32 in the bridging direction, it is a free end and cannot exert elastic force, so that it extends rearward. The protruding part is excluded from the length. The annular portion 28C portion through which the second wire 32 is inserted becomes the end portion of the length of the cloth spring member 22.

As shown in FIG. 1, a pair of back upper and lower frames 44 are arranged at both ends of the seat back 40 in the vertical direction of the seat. The back upper and lower frames 44 are arranged at intervals from each other on both sides in the vertical direction of the seat surrounding the back area 47 of the occupant as an example of the seat area. The back upper and lower frames 44 extend along the seat width direction to form the skeleton of the seat back 40. The lower side of the back upper and lower frames 44 is the lower back frame 44A, and the upper side is the upper back frame 44B. The cloth spring unit 20 described above is bridged to the pair of back upper and lower frames 44.

The cloth spring unit 20 has one end 26 side arranged on the upper back frame 44B side and the other end 28 side arranged on the lower back frame 44A side. That is, the cloth spring member 22 has one end 26 side attached to the upper back frame 44B via the first wire 30 and the hook 34. Further, the other end 28 side is attached to the lower back frame 44A via the second wire 32 and the hook 34. That is, the cloth spring member 22 is bridged between the lower back frame 44A and the upper back frame 44B.

In the seat cushion 12 and the seat back 40, the load of the occupant is elastically supported by the cloth spring unit 20. A ventilation foam layer and a front seat layer (not shown) are laminated on the seated occupant side of the seat cushion 12 and the seat back 40 with respect to the cloth spring unit 20.

Next, the operation of this embodiment will be described.

When seated on the vehicle seat 10, the seat cushion 12 supports the occupant's thighs and buttocks from below, and the seat back 40 supports the occupant's upper body from the back side. At this time, the cloth spring member 22 is elastically deformed by the load from the occupant.

In the seat surface region 17, the cloth spring member 22 of the cloth spring unit 20 bridged to the cushion front-rear frame 14 has a length in the spanning direction on both outer sides in the seat width direction rather than the central portion in the seat width direction. Is short. Further, also in the back region 47, the cloth spring member 22 of the cloth spring unit 20 bridged to the back upper and lower frames 44 has a length in the spanning direction on both outer sides in the seat width direction with respect to the central portion in the seat width direction. Is shorter. Therefore, both outer sides in the seat width direction in which the cloth spring member 22 is short have a higher elastic modulus than the central portion in the seat width direction. Therefore, the side end side 22B side of the cloth spring member 22 having a high elastic modulus can reduce the amount of deformation due to the load from the seated occupant as compared with the central portion. Thereby, the movement of the seated occupant in the seat width direction can be restricted.
In the present embodiment, the cloth spring member 22 is attached to the front cushion frame 14A on the one end 26 side via the first wire 30 and the hook 34, and on the other end 28 side via the second wire 32 and the hook 34. Although it is attached to the rear cushion frame 14B, it may be attached to the front cushion frame 14A and the rear cushion frame 14B in other configurations. For example, the hook 34 may be directly attached to one end 26 and the other end 28 of the cloth spring member 22, and may be attached to the front cushion frame 14A and the rear cushion frame 14B via the hook 34. Further, the extending directions of the front cushion frame 14A and the rear cushion frame 14B are aligned with one end 26 and the other end 28 of the cloth spring member 22, and the cloth spring member 22 is directly attached to the front cushion frame 14A and the rear cushion frame 14B. You may. The above configuration may be applied to the second to fourth embodiments described later and each modification.

In the first embodiment, the other end 28 of the cloth spring member 22 is inclined so that the outer side in the seat width direction faces the one end 26 side in a plan view, but the present invention is not limited to this configuration. For example, the other end 28 of the cloth spring member 22 is inclined so that the outside in the seat width direction faces the one end 26 side in a plan view, while the one end 26 is in the plan view and the outside in the seat width direction is the other end 28 side. It may be configured to incline toward. The above configuration may be applied to the second to fourth embodiments and each modification described later.

[Second Embodiment]
Next, a second embodiment of the vehicle seat according to the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 5, the seat cushion 12 has a pair of cushion side frames 16 arranged at both ends in the seat width direction. The cushion side frames 16 are arranged on both outer sides in the seat width direction surrounding the seat area 17 of the occupant at intervals from each other. The cushion side frame 16 extends along the front-rear direction of the seat and forms the skeleton of the seat cushion 12. A cloth spring unit 50 is bridged between the pair of cushion side frames 16.

As shown in FIG. 6, the cloth spring unit 50 includes a cloth spring member 52, a third wire 60, a fourth wire 62, and a hook 64.

The cloth spring member 52 is made of an elastic cloth material such as an elastic woven fabric, and has a cloth spring main body portion 54, one end portion 56, and the other end portion 58 as shown in FIG. 7. .. One end 56 is arranged on one side on the outer side in the seat width direction, and the other end 58 is arranged on the other side on the outer side in the seat width direction with the cloth spring main body portion 54 interposed therebetween.

The one end 56 and the other 58 are inclined so that the front side of the seat faces the outside in the seat width direction in a plan view. Notches 55 and 57 are formed at the center of one end 56 and the other end 58 in the extending direction, respectively.

The one end portion 56 is folded back toward the other end portion 58 side by the folding line 56A, and is sewn to the cloth spring main body portion 54 by the sewing line 56B as shown in FIG. The other end 58 is folded back toward the one end 56 side by the folding line 58A, and is sewn to the cloth spring main body 54 by the sewing line 58B. An annular portion 56C is sewn on the one end 56 side of the sewing line 56B by the cloth spring main body 54 and the one end 56. The folding line 56A forms a side end side 52B of the cloth spring member 52, which will be described later. An annular portion 58C is sewn on the other end 58 side of the sewing line 58B by the cloth spring main body 54 and the other end 58. The folding line 58A forms a side end side 52B of the cloth spring member 52, which will be described later.

As shown in FIG. 6, the cloth spring member 52 has a long end side 52A arranged on the front side or the upper side of the seat as an outer edge in a plan view, and a side end side arranged on one end side and the other end side in the seat width direction. It has 52B and a short end side 52C arranged on the rear side of the seat or the lower side of the seat. The long end side 52A and the short end side 52C are arranged along the sheet width direction, and the side end side 52B is arranged so as to be inclined along the folding lines 56A and 58A, respectively.

A third wire 60 is attached to the annular portion 56C of the cloth spring member 52. As shown in FIG. 7, the third wire 60 has an insertion portion 60A and a connecting portion 60B bent from both ends of the insertion portion 60A. The insertion portion 60A is inserted through the annular portion 56C, and the extension portion 60B extends outside the cloth spring member 52 in the seat width direction. The third wire 60 is provided on both sides of the notch 55. The length of the gantry portion 60B arranged on the front side of the seat is longer than the length of the gantry portion 60B arranged on the rear side of the seat.

A hook 64 is provided at each tip of the overhanging portion 60B. The hook 64 has a hook shape and is fastened to the cushion side frame 16 on one end side. The hooks 34 provided on the bridge portions 60B adjacent to each other with the notch portion 55 interposed therebetween are connected by the connecting portion 64A.

A fourth wire 62 is attached to the annular portion 58C of the cloth spring member 52. The fourth wire 62 has an insertion portion 62A and a connecting portion 62B bent from both ends of the insertion portion 62A. The insertion portion 62A is inserted through the annular portion 58C, and the extension portion 62B extends in the front-rear direction of the seat on the outside of the cloth spring member 52. The second wire 62 is provided on both sides of the notch 57. The length of the bridge portion 62B arranged on the front side of the seat is longer than the length of the bridge portion 62B arranged on the rear side of the seat.

A hook 64 is provided at each tip of the overhanging portion 62B. The hook 64 has a hook shape and is fastened to the cushion side frame 16 on the other end side. The tips of the hooks 64 of the second wires 62 are connected to each other by the connecting portion 64B. Further, the hooks 64 provided on the bridge portions 62B adjacent to each other with the notch portion 57 interposed therebetween are connected by the connecting portion 64A.

The cloth spring member 52 is attached to the cushion side frame 16 on one end side via a third wire 60 and a hook 64 at one end 56 side. Further, the other end 58 side is attached to the cushion side frame 16 on the other end side via the second wire 62 and the hook 64. That is, the cloth spring member 52 is bridged between the pair of cushion side frames 16.

As shown in FIG. 5, the seat back 40 has a pair of back side frames 46 arranged at both ends in the seat width direction. The backside frames 46 are arranged on both sides in the seat width direction surrounding the back region 47 of the occupant at intervals from each other. The back side frame 46 extends along the vertical direction of the seat and forms the skeleton of the seat back 40. The cloth spring unit 50 described above is bridged to the pair of backside frames 46.

In the cloth spring unit 50, one side of the side end side 52B is arranged on one side of the back side frame 46, and the other side is arranged on the other side of the back side frame 46. That is, one side of the cloth spring member 52 is attached to one side of the backside frame 46 via the third wire 60 and the hook 64. Further, the other side is attached to the other side of the backside frame 46 via the fourth wire 62 and the hook 64. That is, the cloth spring member 52 is bridged between the pair of backside frames 46.

Next, the operation of this embodiment will be described.
When seated on the vehicle seat 10, the seat cushion 12 supports the occupant's thighs and buttocks from below, and the seat back 40 supports the occupant's upper body from the back side. At this time, the cloth spring member 52 is elastically deformed by the load from the occupant.

In the seat surface region 17, the cloth spring member 52 of the cloth spring unit 50 bridged to the cushion side frame 16 has a shorter length in the crossing direction in the rear side of the seat than in the front side of the seat. Therefore, the elastic modulus behind the seat where the cloth spring member 52 is short is higher than that at the front. Since the load from the seated occupant to the cloth spring member 52 is larger on the buttocks side than on the thigh side, the cloth spring member 52 can stably receive the load of the seated occupant by increasing the elastic modulus on the rear side of the seat. Can be done.

Further, in the back region 47, the cloth spring member 52 of the cloth spring unit 50 bridged over the pair of backside frames 46 has a shorter length in the crossing direction in the lower part of the seat than in the upper part of the seat. The cloth spring member 52 bridged in the seat width direction has a long length from the lower side of the seat to the upper side of the seat, and has a small elastic modulus on the upper side of the seat. By reducing the elastic modulus on the upper side of the seat in this way, it is possible to improve the cushioning performance of the seated occupant at the time of the backrest.

In the present embodiment, the cloth spring unit 50 is bridged to the cushion side frame 16 so that the length of the cloth spring member 52 in the spanning direction is shorter behind the seat than at the front of the seat. The cloth spring unit 50 may be laid so that the length of the 52 in the laying direction is reversed in the front-rear direction so that the rear of the seat is longer than the front of the seat. In this case, since the elastic modulus in the front of the seat where the cloth spring member 52 is short is higher than that in the rear, it is possible to restrict the movement of the seated occupant to the front of the seat during sudden braking or the like.

In the present embodiment, the cloth spring unit 50 is arranged on the seat cushion 12 and the seat back 40, but the cloth spring unit 50 may be arranged on either the seat cushion 12 or the seat back 40.

Further, the cloth spring unit 20 of the first embodiment and the cloth spring unit 50 of the second embodiment may be used in combination as appropriate. That is, the cloth spring unit 20 may be arranged on the seat cushion 12 and the cloth spring unit 50 may be arranged on the seat back 40, or the cloth spring unit 50 may be arranged on the seat cushion 12 and the cloth on the seat back 40. The spring unit 20 may be arranged.

[Third Embodiment]
Next, a third embodiment of the vehicle seat according to the present invention will be described. The present embodiment is the same as the first embodiment except for the configuration of the cloth spring unit 50. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 8A to 8C, the cloth spring unit 70 of the present embodiment includes a cloth spring member 22, a first wire 30, a second wire 72, and a hook 34. The cloth spring unit 70 of the present embodiment is the same as the cloth spring unit 20 of the first embodiment except for the configuration of the second wire 72.

A second wire 72 is attached to the annular portion 28C of the cloth spring member 22. As shown in FIGS. 8 (A) to 8 (C), the second wire 72 includes an insertion portion 72A, a bridge portion 72B bent from one end of the insertion portion 72A, and the other end of the insertion portion 72A. It has a bridge portion 72C bent from the above. The insertion portion 72A is inserted through the annular portion 28C, and is inclined so that the other end located outside in the seat width direction is located above the seat with respect to the one end located inside in the seat width direction. The overhanging portion 72B extends in the front-rear direction of the seat on the outside of the cloth spring member 22. On the other hand, the bridge portion 72C extends in the front-rear direction of the seat on the inside (notch 27 side) of the cloth spring member 22 in the seat width direction. Further, the second wire 72 is provided on both sides of the notch 27. Further, the length of the bridge portion 72B arranged on the center side in the seat width direction is shorter than the length of the bridge portion 72C arranged on the outside in the seat width direction.

As shown in FIGS. 8A and 8C, since the cloth spring member 22 is attached to the second wire 72, the height in the vertical direction of the seat is in the width direction of the seat on the rear side of the seat. A portion 22D lower than both ends (side edge 22B) is formed. Since the cloth spring member 22 is formed with a portion 22D whose position in the vertical direction of the seat is relatively low with respect to both ends in the width direction of the seat, a crease 22E is formed between the low portion 22D and a portion higher than the portion 22D. It is formed.

The cloth spring unit 70 of the present embodiment is used by being bridged over a pair of cushion front and rear frames 14.

Next, the operation of this embodiment will be described. The description of the operation obtained by the same configuration as that of the first embodiment will be omitted.

In the present embodiment, the second wire 72 forms a portion 22D of the cloth spring member 22 at least on the rear side of the seat so that the height in the vertical direction of the seat is lower than both ends in the width direction of the seat. The portion 22D having a low height in the vertical direction of the seat has a lower deformation start position (deflection start position) with respect to a load from the seated occupant than both ends in the seat width direction, so that at least the seating pressure on the buttocks side of the seated occupant is lower. Can be locally reduced. In particular, since the outside in the seat width direction is higher than the seat 22D, which is the boundary of the seat 22D having a low height in the vertical direction of the seat, the seated occupant in the low portion 22D. The sitting pressure can be effectively reduced.

In the third embodiment, the other end of the insertion portion 72A of the second wire 72, which is located outside the seat width direction, is inclined so as to be located above the seat. The present invention is not limited to this configuration. For example, as in the second wire 74 of the modified example shown in FIG. 9, the insertion portion 74A may be bent so as to be convex toward the lower side of the sheet to form a concave portion. By forming the recessed portion on the second wire 74, the recessed portion 22F is also formed on the cloth spring member 22 at the portion corresponding to the recessed portion. Here, since the height of the recessed portion 22F of the cloth spring member 22 in the vertical direction of the seat is lower than that of the other parts, the deformation start position (deflection start position) with respect to the load from the seated occupant is lower, and at least the seated occupant The sitting pressure on the buttocks side can be reduced at the portion corresponding to the concave portion 22F. For example, when the concave portion 22F corresponds to the ischium, the riding comfort of the seated occupant is improved.

In the third embodiment, the insertion portion 72A of the second wire 72 is inclined so that the other end located outside in the seat width direction is located above the seat with respect to the one end located inside in the seat width direction. , The present invention is not limited to this configuration. For example, as in the second wire 76 of another modified example shown in FIG. 10, the insertion portion 76A may be bent so as to be convex toward the front of the seat or the rear of the seat to form the convex portion. By forming a convex portion on the second wire 76 and forming a convex portion 78A on the second wire 76 of the cloth spring member 78 at a portion corresponding to the convex portion, the length in the direction spanned by the convex portion 78A can be increased. become longer. By locating the sciatica of the seated person in the portion corresponding to the convex portion 78A, the riding comfort of the seated person is improved.

Further, in the third embodiment, the insertion portion 30A of the first wire 30 is extended so that one end located inside in the sheet width direction and the other end located outside in the sheet width direction are substantially the same position in the sheet vertical direction. However, the present invention is not limited to this configuration. For example, as in the cloth spring unit 110 of another embodiment of the present invention shown in FIGS. 16A to 16D, one end portion of the insertion portion of the first wire 112 located inside in the seat width direction. The other end located outside in the width direction of the seat may be inclined so as to be located above the seat. With this configuration, the sitting pressure of the seated occupant can be reduced more effectively. Further, for example, as in the cloth spring unit 120 of still another embodiment of the present invention shown in FIGS. 17 (A) to 17 (D), the insertion portion of the first wire 122 is located inside in the seat width direction. Extend from one end to the other end located outside the seat width direction and above the one end without changing the position in the vertical direction of the seat (the height in the vertical direction of the seat remains the same), and in the middle May be tilted toward the other end. With this configuration, the sitting pressure of the seated occupant can be reduced more effectively.

[Fourth Embodiment]
Next, a fourth embodiment of the vehicle seat according to the present invention will be described. The present embodiment is the same as the second embodiment except for the configuration of the cloth spring unit 80. The same parts as those in the second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 11A and 11B, the cloth spring unit 80 of the present embodiment includes a cloth spring member 82, a first wire 84, a second wire 86, and a hook 34.

The first wire 84 and the second wire 86 are arranged at intervals in the sheet width direction. Further, both ends of each of the first wire 84 and the second wire 86 are bent outward in the seat width direction, and hooks 34 are attached to the tip portions, respectively. Further, the insertion portions 84A and 86A inserted into both ends of the cloth spring member 82 of the first wire 84 and the second wire 86 in the seat width direction are curved in an arc shape toward the rear side of the seat so as to be separated from each other. Curved portions 84B and 86B are formed. These curved portions 84B and 86B are curved so as to be convex toward the lower side of the seat when viewed from the seat width direction.

The cloth spring member 82 is made of the same material as the cloth spring member 52 of the second embodiment. Both ends of the cloth spring member 82 in the seat width direction are attached to the first wire 84 and the second wire 86, respectively.

Next, the operation of this embodiment will be described. The description of the operation obtained by the same configuration as that of the second embodiment will be omitted.

In the present embodiment, curved portions 84B and 86B are formed on the seat rear side of the first wire 84 and the second wire 86 so as to be convex toward the lower side of the seat when viewed from the seat width direction. Therefore, at the portions of the cloth spring member 82 corresponding to the curved portions 84B and 86B, the buttocks of the seated occupant are better fitted, and the movement of the seated occupant in the front-rear direction can be restricted.
Further, since the curved portions 84B and 86B have a wider width in the seat width direction from the front side of the seat to the rear side of the seat, the seating pressure of the thighs of the seated occupant is secured and the fit of the buttocks is further improved. Therefore, the movement of the seated occupant in the front-rear direction can be regulated more effectively.

Further, since the first wire 84 and the second wire 86 are smoothly curved, the seating pressure of the seated occupant can be changed smoothly (continuously). This improves the feeling of continuous sitting pressure of the seated occupant.

In the fourth embodiment, the cloth spring member 82 similar to the cloth spring member 52 of the second embodiment is used, and the density of the warp threads (arrangement interval) and the density of the weft threads (arrangement interval) are substantially constant. However, the present invention is not limited to this configuration. For example, as in the cloth spring member 88 shown in FIG. 12, the density of the warp threads 89 of the elastic fibers forming the cloth spring member 88 may be dense on the front side of the seat and sparse on the rear side of the seat. With this configuration, it is possible to increase the sitting pressure of the portion located on the thigh while reducing the sitting pressure of the portion located on the buttocks of the seated occupant. The configuration for changing the density of the warp threads of the elastic fiber may be applied to the first to third embodiments and each modification. For example, when applied to the first embodiment, it becomes the cloth spring member 90 of the modified example shown in FIG. In the cloth spring member 90, the density of the warp threads 91 is dense at the central portion in the sheet width direction and both ends, and the density of the warp threads 91 between the central portion and both ends in the sheet width direction is sparse. According to this configuration, the density of the warp threads 91 becomes sparse under the ischial bone of the seated occupant, so that the riding comfort is improved.
In FIG. 12, the warp threads 89 are shown so that the arrangement intervals of the warp threads 89 are extremely different so that the density of the warp threads 89 can be easily determined. In FIG. 13, similarly to FIG. 12, the warp yarns 91 are shown so that the arrangement intervals of the warp yarns 91 are extremely different so that the density of the warp yarns 91 can be easily discriminated.

Further, in the fourth embodiment, the cloth spring unit 80 is attached to the cushion side frame 16, but the present invention is not limited to this configuration. For example, it may be attached to the back side frame 46. Further, instead of the cloth spring unit 80, the cloth spring unit 100 shown in FIG. 14A may be attached to the backside frame 46. The first wire 102 and the second wire 104 of the cloth spring unit 100 are formed with curved portions 102A and 104A that are curved in an arc shape so as to expand in a direction away from each other from the lower side of the seat toward the intermediate portion. Curved portions 102B and 104B that are curved in an arc shape are formed so as to spread in a direction away from each other toward the upper side of the seat. Further, the curved portions 102A and 104A are curved in an arc shape so as to be convex from the lower side of the seat toward the upper side of the seat. Both ends of the first wire 102 and the second wire 104 are attached to the pair of backside frames 46, respectively. A cloth spring member 106 is attached to the first wire 102 and the second wire 104. In this modified example, the third wire 106 extending in the seat width direction is attached to the lower side of the seat of the cloth spring member 106. With the above configuration, the holdability of the portion of the cloth spring member 106 corresponding to the curved portions 102A and 104A, that is, the lumbar region of the seated occupant is improved. On the other hand, the cushioning property of the portion of the cloth spring member 106 corresponding to the curved portions 102B and 104B, that is, the shoulder portion of the seated occupant is improved. Further, the weft thread 107 of the cloth spring member 106 of the above-described modified example is densely packed at a position corresponding to the curved portions 102A and 104A, and sparsely arranged at a position corresponding to the curved portions 102B and 104B to cushion the shoulder portion of the seated occupant. The property is further improved (see FIG. 15).

Although the embodiments of the present invention have been described above, the present invention is not limited to the above, and it is possible to carry out various modifications other than the above within a range not deviating from the gist thereof. Of course.

10 Vehicle seat 12 Seat cushion 14 Cushion front and rear frame (frame member)
16 Cushion side frame (frame member)
17 Seat area (seat area)
22 Cloth spring member 22D Lower part 26C Ring part 28C Ring part 30 First wire (wire)
32 Second wire (wire)
34 Hook (mounting member)
40 Seat back 44 Back top and bottom frame (frame member)
46 Backside frame (frame member)
47 Back area (seat area)
52 Cloth spring member 56C annular part 58C annular part 60 3rd wire (wire)
62 Fourth wire (wire)
64 hook (mounting member)
84B curved part 86B curved part

Claims (6)

A pair of frame members that form at least one skeleton of the seat cushion and the seat back and are spaced apart from each other at positions surrounding the seat area that supports the occupant.
It is bridged between the pair of frame members so as to cover the sheet area, and the length of the frame member in the extending direction at least one end side in the extending direction is the center of the frame member in the extending direction. An elastic cloth spring member shorter than the length in the bridged direction in the portion.
With
The seat area includes a seat area that supports the thighs of the occupant from below.
The pair of frame members include a pair of cushion side frames extending in the front-rear direction of the seat at positions surrounding the seat surface region at intervals in the seat width direction.
A vehicle seat in which the length of the cloth spring member bridged between the cushion side frames in the seat width direction increases from the rear of the seat to the front of the seat. The vehicle seat according to claim 1 , wherein a portion whose height in the vertical direction of the seat is lower than both ends in the width direction of the seat is formed at least on the rear side of the seat of the cloth spring member. A pair of frame members that form at least one skeleton of the seat cushion and the seat back and are spaced apart from each other at positions surrounding the seat area that supports the occupant.
It is bridged between the pair of frame members so as to cover the sheet area, and the length of the frame member in the extending direction at least one end side in the extending direction is the center of the frame member in the extending direction. An elastic cloth spring member shorter than the length in the bridged direction in the portion.
With
The seat area includes a back area that supports the back of the occupant.
The pair of frame members include upper and lower back frames extending in the seat width direction at positions surrounding the back region at intervals in the seat vertical direction.
A vehicle seat in which the length of the cloth spring member bridged between the upper and lower back frames in the vertical direction of the seat becomes shorter from the central portion in the seat width direction to the outer side in the seat width direction. The seat area includes a back area that supports the back of the occupant.
The pair of frame members include a backside frame extending in the vertical direction of the seat at a position surrounding the back region at intervals in the width direction of the seat.
The vehicle seat according to claim 1 or 2 , wherein the length of the cloth spring member bridged between the back side frames in the seat width direction increases from the lower side of the seat to the upper side of the seat. The cloth spring member is formed with an annular portion that is sewn by folding back an end edge of the cloth spring member along the frame member.
A wire that is inserted through the annular portion and supports the end edge of the cloth spring member,
A mounting member that attaches the wire to the frame member,
The vehicle seat according to any one of claims 1 to 4, further comprising. A pair of frame members that form at least one skeleton of the seat cushion and the seat back and are spaced apart from each other at positions surrounding the seat area that supports the occupant.
It is bridged between the pair of frame members so as to cover the sheet area, and the length of the frame member in the extending direction at least one end side in the extending direction is the center of the frame member in the extending direction. An elastic cloth spring member shorter than the length in the bridged direction in the portion.
With
The seat area includes a seat area that supports the thighs of the occupant from below.
The pair of frame members include a pair of cushion front-rear frames extending in the seat width direction at positions surrounding the seat area at intervals in the seat front-rear direction.
The length of the cloth spring member bridged between the cushion front-rear frames in the seat front-rear direction becomes shorter from the central portion in the seat width direction to the outside in the seat width direction.
The cloth spring member is formed with an annular portion that is sewn by folding back an end edge of the cloth spring member along the frame member.
A wire that is inserted through the annular portion and supports the end edge of the cloth spring member,
A mounting member that attaches the wire to the frame member,
With more
The wires are arranged in pairs at intervals in the sheet width direction.
A vehicle seat in which a curved portion that is convex toward the lower side of the seat when viewed from the seat width direction is formed on the rear side of the seat of the wire.