JP6912319B2 - Vehicle seat - Google Patents

Description

This specification discloses a vehicle seat mounted on a vehicle.

In order to further improve the comfort of the occupants of the automobile, it is required to further improve the fit of the seat on which the occupants sit. Examples of the method for improving the fit of the sheet include changing the surface shape of the sheet, changing the internal structure of the sheet, and changing the physical properties of the material. Changes in the surface shape of the seat include, for example, making the seating surface of the seat into a shape that conforms to the shape of the human body. Further, the modification of the internal structure of the seat includes, for example, providing a mechanical component for adjusting the cushion length. Further, the change in the physical properties of the material includes, for example, adopting soft urethane on the surface side and hard urethane on the inner surface side as the material of the seat cushion.

However, if the internal structure of the sheet is changed or the physical properties of the material are changed, a large design change is required, development takes time, and the cost of the sheet increases. Therefore, it is desired to improve the fit by devising the surface shape of the seat, for example, the shape of the surface (seat surface) of the seat cushion on which the occupant sits.

For example, Patent Document 1 discloses a seat in which the seat surface of the seat cushion is inclined in the front-rear direction of the vehicle so as to rise forward. By inclining the seat surface so as to rise forward in this way, the contact area between the seat cushion and the occupant is increased, and the fit is improved.

Japanese Unexamined Patent Publication No. 2010-95054

However, if the seat surface is simply tilted, the seating comfort is good in a short time, but if the seat is continuously seated for a long time, the posture of the occupant tends to tilt later. In this case, the occupant had to unknowingly put his or her body into force in order to maintain the posture, or had to return to the original posture on a regular basis, which could lead to tiredness.

Therefore, this specification discloses a seat that can further improve the sitting comfort without changing the internal structure of the seat and the physical characteristics of the material.

The vehicle seat disclosed in the present specification is a seat cushion on which an occupant sits, and is a seat cushion in which the seat surface is inclined so as to become higher toward the front, and a occupant standing from the rear end of the seat cushion. The back frame, which includes a seat back that supports the back of the seat back and constitutes the skeleton of the seat back, is laid between two or more columnar members arranged at least in the width direction and the two columnar members. It has one or more cross members to be passed, the cross member includes a first cross member provided at a position supporting the pelvis of the occupant, and in the vicinity of the rear end of the seat surface in the width direction. An extending first seating surface groove is formed, and a second seating surface groove extending in the width direction is formed at substantially the center of the seating surface in the front-rear direction.

By inclining the seat surface, the contact area between the occupant and the seat cushion is improved, and the fit is improved. On the other hand, if the seat surface is tilted forward, the occupant's posture tends to tilt later, but by providing the first cross member provided at a position that supports the pelvis of the occupant, the occupant is surely supported and the occupant is supported. Improves sitting comfort. Further, by providing the second seat surface groove extending in the width direction at substantially the center of the seat surface in the front-rear direction, the front slip of the buttocks of the occupant is suppressed. As a result, even if the person continues to sit on the seat for a long time, he / she is less likely to get tired, and the seat comfort is improved. Here, "front" and "rear" mean front and rear for the occupant seated in the seat, and "width direction" means the left-right direction for the occupant.

The distance in the height direction from the rear end of the seat surface to the first cross member may be 115 mm or more and 135 mm or less.

By providing the first cross member at such a position, the pelvis of the occupant can be supported more reliably. Here, the "height direction" is the vertical direction for the occupant seated in the seat.

Further, the distance in the front-rear direction from the rear end of the seat surface to the second seat surface groove may be 180 mm or more and 215 mm or less.

By providing the second seat groove at such a position, it is possible to more reliably suppress the forward slip of the occupant's buttocks.

The inclination angle with respect to the longitudinal direction of the seat surface, the more the angle from the monodentate surface groove to the second Zamenmizo, it becomes larger towards the angle of the forward portion than the second seat surface groove May be good.

With such a configuration, the portion in front of the second seat surface groove functions like a step that prevents the buttocks from slipping forward, and the buttocks are more reliably prevented from slipping forward, which in turn makes the seat more comfortable to sit on. improves.

Further, the cross member may further include a second cross member located above the first cross member and a third cross member located above the second cross member.

With this configuration, not only the pelvis of the occupant but also the lumbar region and the back (near the shoulder blades) are supported, so that the occupant's sitting comfort is further improved.

Since the vehicle seat disclosed in the present specification has an inclined seat surface, the contact area between the occupant and the seat cushion is improved, and the fit is improved. On the other hand, if the seat surface is tilted forward, the occupant's posture tends to tilt later, but by providing the first cross member provided at a position that supports the pelvis of the occupant, the occupant is surely supported and the occupant is supported. Improves sitting comfort. Further, by providing the second seat surface groove extending in the width direction at substantially the center of the seat surface in the front-rear direction, the front slip of the buttocks of the occupant is suppressed. As a result, even if the person continues to sit on the seat for a long time, he / she is less likely to get tired, and the seat comfort is improved.

It is a perspective view of a rear seat. It is a schematic cross-sectional view of a rear seat. It is an enlarged view of the main part of FIG. It is an enlarged view of a seat cushion. It is a front view of the back frame of the left seat back. It is a figure which shows the positional relationship between the back frame of the left seat back and an occupant.

Hereinafter, the configuration of the vehicle seat will be described with reference to the drawings. FIG. 1 is a perspective view of a rear seat 10 which is an example of a vehicle seat. Further, FIG. 2 is a schematic cross-sectional view of the rear seat 10, and FIG. 3 is an enlarged view of a main part of FIG. Although the covers 26 and 34 are emphasized in FIG. 2, the covers 26 and 34 are actually thinner and are in close contact with the pads 20 and 32. Further, in FIG. 3, the illustrations of the covers 26 and 34 are omitted.

The rear seat 10 is a seat for three people that constitutes the seats in the second and subsequent rows of the automobile. The rear seat 10 includes a seat cushion 12 on which the occupant sits, a seat back 14 that supports the back of the occupant, and a headrest 16 that supports the head of the occupant. The seat cushion 12 has a continuous structure having a long width that can seat three people. The seat back 14 is divided into left and right at a ratio of 4: 6, and in the case of the illustrated example, it has a right seat back 14R for one person and a left seat back 14L for two people. .. In the following, when the right side and the left side are not distinguished, the subscripts R and L are omitted and referred to as "seat back 14". There are three headrests 16, each of which is detachably attached to a corresponding position at the upper end of the seat back 14.

The seat cushion 12 will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of the seat cushion 12. As is clear from FIG. 4, the upper surface of the seat cushion 12, that is, the seat surface 18 on which the occupant sits, is inclined with respect to the vehicle front-rear direction (front-rear direction for the occupant) so as to become higher as the occupant moves forward. .. The seat cushion 12 includes a cushion frame (not shown) constituting the skeleton, a cushion pad 20 supported by the cushion frame, and a cushion cover 26 covering the outer surface of the cushion pad 20.

The cushion frame is composed of a combination of wire rods made of metal, and is fixed to a fixing member in the vehicle interior. Since this cushion frame can use a well-known known technique, detailed description here will be omitted.

The cushion pad 20 is made of a material having an appropriate cushioning property, for example, urethane foam or the like. The bottom surface of the cushion pad 20 is substantially parallel to the front-rear direction of the vehicle, while the top surface of the cushion pad 20 is inclined with respect to the front-rear direction of the vehicle so as to gradually increase as the vehicle advances forward. Therefore, it can be said that the thickness of the cushion pad 20 increases as it approaches the front end. A first suspension groove 22a and a second suspension groove 22b extending in the vehicle width direction (left-right direction for the occupant) are formed on the upper surface of the cushion pad 20. The first and second suspension grooves 22a and 22b are both grooves for pulling the cushion cover 26, which will be described later, into the groove and pulling the cushion cover 26. Inside the first and second suspension grooves 22a and 22b, locking members (not shown) are provided to hook and lock the engaging straps and the like attached to the cushion cover 26. A part of the cushion cover 26 is suspended in the suspension grooves 22a and 22b by pulling the strings and the like provided on the cushion cover 26 into the suspension grooves 22a and 22b and hooking them on the locking member. Then, by suspending a part of the cushion cover 26 into the suspension grooves 22a and 22b, the surface of the cushion cover 26 can be given a three-dimensional effect, and an appropriate tension can be applied to the cushion cover 26. Further, by suspending a part of the cushion cover 26 into the first and second suspension grooves 22a and 22b, the first and second seat surface grooves 28a and 28b extending in the vehicle width direction are formed on the seat surface 18. Will be done.

Here, the first seat surface groove 28a (first suspension groove 22a) is provided near the rear end of the cushion pad 20. The first seat surface groove 28a corresponds to the rear end of the seat surface 18, and the cushion pad 20 stands up toward the seat back 14 side, which will be described later, at the rear end side of the first seat surface groove 28a. There is.

The second seat surface groove 28b (second suspension groove 22b) is located substantially at the center of the cushion pad 20 in the vehicle front-rear direction. That is, as shown in FIG. 3, the vehicle front-rear direction distance (distance from the rear end of the seat surface 18 to the second seat surface groove 28b) from the first seat surface groove 28a to the second seat surface groove 28b is defined as L1. When the vehicle front-rear direction distance from the two-seat groove 28b to the front end of the cushion pad 20 is L2, the distance L1 is substantially the same as or slightly smaller than the distance L2. More specifically, the second seat groove 28b is provided at a position preferably 180 mm or more, more preferably 185 mm or more, from the rear end of the seat surface 18 (that is, the first seat groove 28a). Further, the second seat surface groove 28b is provided at a position preferably 90 mm or more, more preferably 95 mm or more away from the hip point HP, which is assumed to be the center of the buttocks of the occupant seated on the rear seat 10. This is to prevent the buttocks from sliding forward, which will be described later.

Further, as shown in FIG. 4, the inclination angle of the upper surface (and thus the seat surface 18) of the cushion pad 20 with respect to the vehicle front-rear direction is larger on the front side of the second suspension groove 22b than on the rear side of the second suspension groove 22b. It has become. That is, when the inclination angle on the rear side of the second suspension groove 22b is α and the inclination angle on the front side is β, β> α. The difference between the two tilt angles (β-α) is preferably 5 ° or more, and more preferably 7 ° or more. The inclination angle α on the rear side of the second suspension groove 22b is preferably 8 ° or more, and more preferably 10 ° or more. The inclination angle β on the front side of the second suspension groove 22b is preferably 15 ° or more, and more preferably 17 ° or more.

The cushion cover 26 covers the cushion pad 20, and is formed by sewing two or more sheet materials together. As the sheet material, for example, cloth, synthetic leather sheet, leather sheet or the like can be used. The cushion cover 26 has a sewn portion formed by sewing sheet materials together. A part of this sewn portion is provided at a position corresponding to the first and second suspension grooves 22a and 22b. A string or the like (not shown) that is engaged with a locking member provided in the suspension grooves 22a and 22b is attached to the end of the sheet material in the vicinity of the sewn portion. As described above, by pulling the string or the like into the suspension groove and hooking it on the locking member, the seat surface grooves 28a and 28b are formed.

Next, the seat back 14 will be described. As shown in FIGS. 1 and 2, the seat back 14 is a portion that supports the back of the occupant and is a portion that stands upward from the rear end of the seat cushion 12. The seat back 14 includes a back frame 30 that serves as a skeleton member, a back pad 32 that is supported by the back frame 30, and a back cover 34 that covers the outer surface of the back pad 32.

Like the cushion pad 20, the back pad 32 is made of a material having an appropriate cushioning property, for example, urethane foam or the like. The back pad 32 is also provided with some suspension grooves, and a part of the back cover 34 is suspended in the suspension grooves. Like the cushion cover 26, the back cover 34 is also formed by stitching two or more sheet materials (cloth, synthetic leather sheet, leather sheet, etc.).

A back frame 30 is arranged behind the back pad 32. FIG. 5 is a front view of the back frame 30 of the left seat back 14L. Further, FIG. 6 is a diagram showing the positional relationship between the back frame 30 of the left seat back 14L and the occupant. As shown in FIGS. 5 and 6, the back frame 30 includes a main frame 40, a support frame 42, and a plurality of cross members 44a to 44d. The lower end of the back frame 30 is welded to the rotating shaft 46. The rotating shaft 46 is rotatably attached to a fixing member (not shown). As the rotation shaft 46 rotates, the back frame 30, and thus the seat back 14, swings (reclines) with respect to the seat cushion 12.

The main frame 40 constituting the back frame 30 is formed by bending a round metal pipe, and has a substantially U shape that opens downward when viewed from the front. More specifically, the main frame 40 is a member in which a pair of columnar members 52a and 52c extending in the vertical direction of the vehicle and a connecting portion 50 connecting the upper ends of the pair of columnar members 52a and 52c are integrated. be.

A support frame 42 is fixed by welding to a position of the back frame 30 corresponding to the boundary between the left seat and the center seat. Here, the support frame 42 and the columnar members 52a and 52c of the main frame 40 both function as columnar members extending in the vertical direction of the vehicle. Therefore, in the following, the columnar portion on the left side (right side in the drawing) is the "first columnar member 52a", the support frame 42 is the "second columnar member 52b", and the columnar portion on the right side (left side in the drawing) is the "third columnar member 52c". Called.

Further, the back frame 30 is roughly divided into a left frame portion 54L corresponding to the left seat and a central frame portion 54C corresponding to the center seat with the second columnar member 52b (support frame 42) as a boundary. .. Hereinafter, the configurations of the left frame portion 54L and the central frame portion 54C will be described.

First, the configuration of the left frame portion 54L will be described. The left frame portion 54L has two columnar members arranged at intervals in the vehicle width direction, that is, a first columnar member 52a and a second columnar member 52b. Three cross members extending in the vehicle width direction, that is, the first cross member 44a, the second cross member 44b, and the third cross member 44c are bridged between the first and second columnar members 52a and 52b. ing. Each of the cross members 44a to 44c is made of a round metal pipe and is fixed to the columnar members 52a and 52b by welding. The plurality of cross members 44a to 44c improve the rigidity of the back frame 30 and support the load of each occupant seated on the rear seat 10.

More specifically, the first cross member 44a mainly supports the upper part of the pelvis of the occupant. The first cross member 44a is provided at a position corresponding to the upper part of the pelvis of the occupant. More specifically, the distance L4 (see FIG. 3) in the vehicle height direction (vertical direction for the occupant) from the rear end of the seat surface 18 to the first cross member 44a is preferably 115 mm or more and 135 mm or less. More preferably, it is 120 mm or more and 130 mm or less. The distance L5 along the torso line Lt from the rear end of the seat surface 18 to the first cross member 44a is preferably 155 mm or more and 175 mm or less, and more preferably 160 mm or more and 170 mm or less. The torso line Lt is an assumed inclined line on the back of the occupant, and is usually a line inclined by 25 ° with respect to the vehicle height direction. The distance L6 along the torso line Lt from the hip point HP to the first cross member 44a is preferably 120 mm or more and 130 mm or less, and more preferably 123 mm or more and 128 mm or less. However, the numerical values shown here are all examples, and may be appropriately changed according to the assumed physique of the occupant, the inclination angle of the seat surface 18, and the like. In any case, it is desirable that the first cross member 44a is provided at a position corresponding to the pelvis of the occupant, particularly the upper part of the pelvis.

Here, some vehicles may not have the first cross member 44a, but in this example, the first cross member 44a is provided in order to improve the sitting comfort of the occupant. The relationship between the first cross member 44a and sitting comfort will be described in detail later.

The second cross member 44b mainly supports the lumbar region (near the lumbar spine) of the occupant. The second cross member 44b is provided above the first cross member 44a and below the center of the seat back 14 in the height direction (see FIG. 2).

The third cross member 44c mainly supports the back of the occupant (near the scapula). The third cross member 44c is provided above the second cross member 44b and above the center of the seat back 14 in the height direction. The third cross member 44c passes from the first columnar member 52a through the second columnar member 52b and further extends to the third columnar member 52c.

Next, the configuration of the central frame portion 54C will be described. The central frame portion 54C has two columnar members arranged at intervals in the vehicle width direction, that is, a second columnar member 52b and a third columnar member 52c. Two cross members extending in the vehicle width direction, that is, a third cross member 44c and a fourth cross member 44d, are provided between the second and third columnar members 52b and 52c. As described above, the third cross member 44c supports the back of the occupant (near the shoulder blades), and is provided above the center of the seat back 14 in the height direction. The fourth cross member 44d is below the third cross member 44c and is provided near the center of the seat back 14 in the height direction.

The back frame 30 of the right seat back 14R has substantially the same configuration as the left frame portion 54L. That is, the first to first columnar members bridged between the pair of columnar members provided at positions corresponding to both ends in the width direction of the right seat, the connecting portion connecting the upper ends of the pair of columnar members, and the pair of columnar members. It has three cross members.

The seating comfort of the rear seat 10 having the above configuration, particularly the seating comfort of the left side seat and the right side seat, will be described. In the rear seat 10 of this example, the seat surface 18 is inclined with respect to the front-rear direction of the vehicle so as to become higher as it approaches the front end. The tilt angle is at least 8 ° or more, and in some places, 15 ° or more. By forming the seat surface 18 in a shape that rises forward in this way, the contact area between the occupant and the seat surface 18 is increased, and the fit is improved.

That is, in general, the posture of the occupant is such that the buttocks sink into the seating surface and the thighs tilt forward by that amount, as shown in FIG. By forming the seat surface in a shape that rises forward according to the inclination of the thigh, the contact area between the thigh and the seat surface is increased, and the fit is improved. In particular, in this example, the inclination angle β on the front side of the seat surface groove 28 is made larger than the inclination angle α on the rear side with the second seat surface groove 28b as a boundary. In this case, even if the buttocks are greatly subducted and the inclination angle of the thighs of the occupant is increased by that amount, the thighs and the seat surface 18 are surely in contact with each other, so that the fit can be surely improved.

On the other hand, when the seat surface has a shape that rises forward, the posture of the occupant tends to tilt backward. More specifically, the occupant's legs are lifted and the pelvis is more likely to tilt later. In addition, the buttocks of the occupant are likely to be located at the back of the seat surface, resulting in a so-called deep sitting state. In this case, the vicinity of the pelvis of the occupant is likely to come into contact with the seat back 14. At this time, if there is no cross member that supports the pelvis, the back pad 32 is deformed so as to avoid the load on the pelvis, and the load on the pelvis cannot be sufficiently supported. As a result, the occupant needs to put more effort into his / her body in order to maintain his / her posture, and if he / she keeps sitting for a long time, he / she becomes tired easily. In this example, a first cross member 44a that supports the upper part of the pelvis is provided near the upper part of the pelvis. As a result, the load on the upper part of the pelvis can be sufficiently supported, and the sitting comfort of the occupant can be improved.

When the occupant sits on the rear seat 10, not only the upper part of the pelvis of the occupant but also the lumbar region (near the lumbar spine) and the back portion (near the scapula) tend to come into contact with the seat back 14. Therefore, the back frame 30 is also provided with a second cross member 44b and a third cross member 44c that support the waist and back. By further providing the second and third cross members 44b and c in addition to the first cross member 44a, the load of the occupant can be supported more stably, and the sitting comfort of the occupant can be further improved.

By the way, if the seat surface 18 is raised forward and the upper part of the pelvis is supported by the seat back 14, the occupant's buttocks gradually slide forward as the occupant's upper body sinks downward. This may cause the occupant's posture to collapse. In this case, in order to prevent the posture from collapsing, the occupant unknowingly exerts force on the body or periodically restores the posture. That is, when the seat surface 18 is raised forward and the upper part of the pelvis is only supported by the seat back 14, the sitting comfort for a short time is improved, but if the seating surface is continued for a long time, the fatigue of the occupant may increase. ..

Therefore, in this example, the second seat surface groove 28b extending in the vehicle width direction is provided near the center of the seat surface 18 in the vehicle front-rear direction, that is, at a position corresponding to the front side of the ischium of the occupant. The second bearing surface groove 28b functions as a frictional resistance and effectively prevents the buttocks from slipping forward.

Further, in this example, the inclination angle β on the front side of the second seat surface groove 28b is made larger than the inclination angle α on the rear side with the second seat surface groove 28b as a boundary. In this case, since the portion on the front side of the second seat surface groove 28b functions like a step that hinders the front slip of the buttocks, the front slip of the buttocks and, by extension, the collapse of the posture of the occupant are more effectively prevented.

As is clear from the above description, in the rear seat 10 disclosed in the present specification, the seat surface of the seat cushion 12 is raised forward, and the second seat extends in the vehicle width direction near the center of the seat surface in the vehicle front-rear direction. A surface groove 28b is provided, and a first cross member 44a that supports the upper part of the pelvis of the occupant is provided on the seat back 14. By combining these three features, the fit of the occupant is improved, the tiredness is less likely to occur even when sitting for a long time, and the seat comfort is improved. Further, in this example, as compared with the conventional rear seat 10, the inclination angle of the seat surface 18 and the position of the second seat surface groove 28b are changed, and the first cross member 44a is only added. In other words, no special materials are used or complicated mechanisms are added to improve sitting comfort. As a result, it is possible to improve the sitting comfort of the seat while suppressing the increase in cost as much as possible.

In the description so far, the seats in the second and subsequent rows of the vehicle, that is, the rear seat 10 have been described as an example, but the techniques disclosed in the present specification include other seats, for example, a driver's seat and an assistant. It may be applied to the seat. Further, in the above description, the number of cross members 44 corresponding to the left seat and the right seat is three, but if there is at least the first cross member 44a that supports the upper part of the pelvis, the number of cross members 44 is three. It may be less than a book or more than three. Further, in the above description, the seat surface inclination angle β on the front side of the second seat surface groove 28b is made larger than the seat surface inclination angle α on the rear side, but both inclination angles may be substantially the same. Further, in the description so far, the seat mounted on the vehicle has been described as an example, but the technology disclosed in the present specification can be mounted on another seat, for example, a marine seat, if it is mounted on a vehicle. Or, it may be applied to an aircraft seat or the like.

10 Rear seat, 12 Seat cushion, 14 Seat back, 16 Headrest, 18 Seat surface, 20 Cushion pad, 22a 1st suspension groove, 22b 2nd suspension groove, 26 Cushion cover, 28a 1st seat surface groove, 28b 2nd seat surface Groove, 30 back frame, 32 back pad, 34 back cover, 40 main frame, 42 support frame, 44a first cross member, 44b second cross member, 44c third cross member, 44d fourth cross member, 46 rotating shaft, 52a 1st columnar member, 52b 2nd columnar member, 52c 3rd columnar member, 54C central frame part, 54L left frame part.

Claims (5)

A seat cushion on which the occupant sits, and a seat cushion in which the seat surface is inclined so that it becomes higher toward the front.
A seat back that stands from the rear end of the seat cushion and supports the back of the occupant,
With
The back frame constituting the skeleton of the seat back is
Two or more columnar members arranged at least spaced apart in the width direction,
With one or more cross members straddling between the two columnar members,
Have,
The cross member includes a first cross member provided at a position supporting the pelvis of the occupant.
A first bearing surface groove extending in the width direction is formed in the vicinity of the rear end of the bearing surface.
A second seating surface groove extending in the width direction is formed at substantially the center of the seating surface in the front-rear direction.
A vehicle seat that features that. The vehicle seat according to claim 1.
A vehicle seat characterized in that the distance in the height direction from the rear end of the seat surface to the first cross member is 115 mm or more and 135 mm or less. The vehicle seat according to claim 1 or 2.
A vehicle seat characterized in that the distance in the front-rear direction from the rear end of the seat surface to the second seat surface groove is 180 mm or more and 215 mm or less. The vehicle seat according to any one of claims 1 to 3.
Angle of inclination with respect to the longitudinal direction of the bearing surface, than the angle from the first monodentate surface groove to the second Zamenmizo, towards the angle of the forward portion than the second seat surface groove is increased, it A vehicle seat featuring. The vehicle seat according to any one of claims 1 to 4.
The vehicle seat further comprises a second cross member located above the first cross member and a third cross member located above the second cross member. ..

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