Vehicle seat

Abstract

To reduce loss of fit around a hip and a lumber part of a seated crewman when reclining.SOLUTION: A vehicle seat 10 comprises a seat cushion 12 having a cushion pad 20, and a seat back 14 having a back pad 22. The seat back 14 reclines with a front side with respect to an end 22D on a lower side of the back pad 22 as a rotation center. A portion on a rear side of the cushion pad 20 is formed into a shape having a convex part 20D which projects toward an upper side. In the state that the seat back 14 is located at a position where a back part of a seated crewman in such an attitude capable of visually confirming a front side can be supported, the end 22D on the lower side of the back pad 22 is located on an upper side with respect to the convex part 20D. Further, as a reclining angle of the seat back 14 increases toward a rear side, the end 22D on the lower side of the back pad 22 moves to seat rear side and lower side with respect to the convex part 20D.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle seat.

Background Art

[0002] Patent Document 1 below discloses an adjustment method for a vehicle seat that can reduce the change in the support position of the occupant's back during reclining. In the method described in this document, when adjusting the tilt angle of the backrest that supports the back of the occupant sitting on the seat cushion, the backrest rotates around a rotation center defined below the reference rotation center of the occupant during reclining and in front of the end of the backrest on the seat cushion side. Specifically, in one example described in Patent Document 1 below, by providing a link mechanism that changes the position of the rotation axis of the backrest in conjunction with the tilt angle of the backrest, the backrest rotates around a rotation center defined in front of the end of the backrest on the seat cushion side. Further, in another example described in Patent Document 1 below, by providing a link mechanism configured to slide the backrest frame along the seat back frame in conjunction with the tilt angle of the backrest, the backrest rotates around a rotation center defined in front of the end of the backrest on the seat cushion side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the configuration described in Patent Document 1 is useful from the viewpoint of suppressing changes in the support position of the occupant's back during reclining, but there is room for improvement from the viewpoint of reducing the deterioration of the fit around the hips and waist of the seated occupant during reclining.

[0005] In view of the above facts, an object of the present invention is to obtain a vehicle seat capable of reducing the deterioration of the fit around the hips and waist of the seated occupant during reclining.

Means for Solving the Problems

[0006] The vehicle seat according to the first aspect includes a seat cushion having a cushion pad that supports the hips of the seated occupant from below the seat, and a seat back having a back pad that supports the back of the seated occupant from behind the seat. The seat back reclines with respect to the seat cushion in a direction of changing the inclination of the seat back about a rotation center on the front side of the seat with respect to an end portion on the lower side of the seat of the back pad. In a cross-sectional view obtained by cutting the seat cushion along a plane formed by the vertical and front-rear directions of the seat at the center in the seat width direction, a portion on the rear side of the seat of the cushion pad is formed in a shape having a convex portion that protrudes upward from the seat. In a state where the seat back is disposed at a position capable of supporting the back of the seated occupant in a posture where the front side of the seat is visible, the end portion on the lower side of the seat of the back pad is disposed above the convex portion. As the reclining angle increases toward the rear side of the seat of the seat back, the end portion on the lower side of the seat of the back pad moves downward and rearward with respect to the convex portion.

[0007] In the vehicle seat according to the first aspect, by setting the rotation center of the seat back to the front side of the seat rather than the end portion on the lower side of the seat of the back pad, that is, by setting the rotation center of the seat back to the hip side of the seated occupant, it is possible to suppress a change in the support position of the occupant's back by the seat back during reclining. Further, the convex portion is formed on the cushion pad. And, in a state where the seat back is disposed at a position capable of supporting the back of the seated occupant in a posture where the front side of the seat is visible, the end portion on the lower side of the seat of the back pad is disposed on the upper side of the seat with respect to the convex portion. Further, as the reclining angle increases toward the rear side of the seat of the seat back, the end portion on the lower side of the seat of the back pad moves toward the rear side and the lower side of the seat with respect to the convex portion. Thereby, when reclining the seat back toward the rear side of the seat, it is possible to reduce the unevenness generated at the boundary portion between the cushion pad and the back pad. As a result, it is possible to reduce the damage to the fitting feeling in the vicinity of the hips and waist of the seated occupant during reclining.

[0008] The vehicle seat according to the second aspect is the vehicle seat according to the first aspect, in which the surface on the seated occupant side of the cushion pad and the surface on the seated occupant side of the back pad are covered with a skin that is continuous in the range from the cushion pad to the back pad.

[0009] According to the vehicle seat of the second aspect, the surface on the seated occupant side of the cushion pad and the surface on the seated occupant side of the back pad are covered with a skin. This skin has a structure in which the range from the cushion pad to the back pad is continuous. In this configuration, when reclining the seat back toward the rear side of the seat, it is possible to reduce the unevenness generated in the portion corresponding to the boundary portion between the cushion pad and the back pad on the skin. As a result, it is possible to reduce the damage to the fitting feeling in the vicinity of the hips and waist of the seated occupant during reclining.

[0010] In the vehicle seat according to the third aspect, in the vehicle seat according to the second aspect, in a cross-sectional view obtained by cutting the seat cushion along a plane formed by the vertical and longitudinal directions of the seat at the center in the seat width direction, the rotation center is located in a range from a position 75 mm above the seat to a position 75 mm below the seat with respect to the upper surface of the skin on the upper side of the seat.

[0011] According to the vehicle seat of the third aspect, the rotation center of the seat back is located within the above range with respect to the upper surface of the skin on the upper side of the seat. In other words, the rotation center of the seat back is close to the skin. In this configuration, compared with a configuration in which the rotation center of the seat back is located outside the above range, the amount of deformation of the skin accompanying the reclining of the seat back can be reduced.

[0012] The vehicle seat according to the fourth aspect is the vehicle seat according to any one of the first to third aspects, and on the seat rear side of the portion where the convex portion is formed in the cushion pad, there is formed a relief-shaped portion where the lower end portion of the back pad on the lower side of the seat is arranged when the seat back reclines in the direction in which it falls.

[0013] According to the vehicle seat of the fourth aspect, when the seat back is reclined in the direction in which it falls, the lower end portion of the back pad on the lower side of the seat is arranged in the relief-shaped portion formed in the cushion pad. In this configuration, it is possible to suppress strong interference between the lower end portion of the back pad on the lower side of the seat and the cushion pad when the seat back is reclined in the direction in which it falls.

Advantages of the Invention

[0014] The vehicle seat according to the present invention has an excellent effect that it can reduce the impairment of the fitting feeling in the vicinity of the buttocks and waist of the seated occupant during reclining.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0016] Using FIGS. 1 to 3, the vehicle seat 10 according to the embodiment of the present invention will be described. In the drawings, the arrows FR and UP shown indicate the front side and the upper side of the seat as viewed from the occupant seated on the vehicle seat 10, respectively. Hereinafter, when simply explaining in the front-rear, up-down, and left-right directions, unless otherwise specified, it shall indicate the front and rear in the seat front-rear direction, the up and down in the seat up-down direction, and the left and right in the seat left-right direction. Also, the seat left-right direction coincides with the seat width direction.

[0017] As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 12 that supports the buttocks P1 of the seated occupant P from below, a seat back 14 that supports the back P2 of the seated occupant P from the rear, and a headrest 18 that supports the head P3 of the seated occupant P from the rear. In FIG. 1, the cross-sectional hatching is omitted for the sake of clarity of the drawing.

[0018] The seat cushion 12 includes a cushion frame that constitutes the skeleton of the seat cushion 12 and a cushion pad 20 attached to the cushion frame.

[0019] The seat back 14 includes a back frame that constitutes the skeleton of the seat back 14 and a back pad 22 attached to the back frame. The lower side of the seat back 14 is pivotally connected to the rear side of the seat cushion 12 about the left - right direction as the axial direction. Thereby, the seat back 14 can be reclined (tilted) in the front - rear direction with respect to the seat cushion 12. Here, in the vehicle seat 10 of the present embodiment, the rotation center C of the seat back 14 with respect to the seat cushion 12 is located on the front side of the lower - side end portion 22D of the back pad 22, which will be described in detail later.

[0020] Next, the configuration of the main part of the present embodiment will be described.

[0021] Figs. 1 to 3 show cross - sections of the cushion pad 20 and the back pad 22 cut along the plane formed by the vertical direction and the front - rear direction at the center in the left - right direction. As shown in these figures, the cushion pad 20 includes a first cushion pad portion 20A that extends along the range from the thigh portion P4 to the buttocks P1 of the seated occupant P, and a second cushion pad portion 20B that extends rearward from the rear end of the first cushion pad portion 20A. The first cushion pad portion 20A constitutes the front - side part and the central part in the front - rear direction of the cushion pad 20. Also, the second cushion pad portion 20B constitutes the rear - side part of the cushion pad 20. A concave groove 20C with an open upper side is formed along the left - right direction at the boundary between the first cushion pad portion 20A and the second cushion pad portion 20B.

[0022] At the center in the front-rear direction of the second cushion pad portion 20B, a convex portion 20D protruding upward is formed. Here, the upper surface of the portion on the front side with respect to the portion where the convex portion 20D is formed in the second cushion pad portion 20B is a flat portion 20E that extends in the front-rear and left-right directions. And the protruding height of the convex portion 20D upward with respect to the flat portion 20E gradually increases toward the rear side. On the rear side with respect to the portion where the convex portion 20D is formed in the second cushion pad portion 20B, a stepped portion 20F is formed as a relief shape portion. The upper surface of this stepped portion 20F is located on the lower side with respect to the flat portion 20E. Here, in the vehicle seat 10 of the present embodiment, the rotation center C of the seat back 14 with respect to the seat cushion 12 is located above the rear end portion of the flat portion 20E.

[0023] The back pad 22 includes a first back pad portion 22A that extends along the vicinity of the shoulders in the back P2 of the seated occupant P, and a second back pad portion 22B that extends downward from the lower end of the first back pad portion 22A and extends along the range from the waist to the buttocks P1 in the back P2 of the seated occupant P. The first back pad portion 22A constitutes the upper portion of the back pad 22. Also, the second back pad portion 22B constitutes the lower portion of the back pad 22. Note that at the boundary between the first back pad portion 22A and the second back pad portion 22B, a concave groove 22C with the front side open is formed along the left-right direction. Also, the shape of the lower end portion 22D of the second back pad portion 22B, which is the lower end portion 22D of the back pad 22 (the shape in the cross-sectional view shown in FIGS. 1 to 3), is formed in a shape that narrows toward the cushion pad 20 side. Also, the shape of the outer peripheral surface of the lower end portion 22D of the second back pad portion 22B is a gently curved shape.

[0024] Further, the cushion pad 20 and the back pad 22 are covered by the skin 24. Here, the portion of the skin 24 that covers the surface of the cushion pad 20 on the side of the seated occupant P will be referred to as the cushion-side covering portion 24A. Also, the portion of the skin 24 that covers the surface of the back pad 22 on the side of the seated occupant P will be referred to as the back-side covering portion 24B. And in the present embodiment, the cushion-side covering portion 24A and the back-side covering portion 24B are configured to be continuously connected without interruption.

[0025] (Operations and Effects of the Present Embodiment) Next, the operations and effects of the present embodiment will be described.

[0026] As shown in FIGS. 1 and 2, in the vehicle seat 10 of the present embodiment described above, each part of the body of the seated occupant P is supported by the seat cushion 12, the seat back 14, and the headrest 18. Here, FIG. 1 shows the seat back 14 located at the first position A1 and the seat back 14 located at the second position A2. In the state where the seat back 14 is located at the first position A1, the back P2 of the seated occupant P is supported by the seat back 14 in a posture where the seated occupant P can visually recognize the front side. Also, in the state where the seat back 14 is located at the second position A2, the back P2 of the seated occupant P is supported by the seat back 14 in a posture where the seated occupant P can take a catnap or the like. Note that the seat back 14 can be reclined rearward (in the falling direction) with the second position A2 as the limit position.

[0027] Here, in the present embodiment, the rotation center C of the seat back 14 with respect to the seat cushion 12 is located on the front side of the lower end 22D of the back pad 22. In other words, the rotation center C of the seat back 14 with respect to the seat cushion 12 is set on the side of the buttocks P1 of the seated occupant P. Thereby, it is possible to suppress a change in the support position of the back P2 of the seated occupant P by the seat back 14 during reclining.

[0028] Further, in the present embodiment, when the seat back 14 is in the first position A1, the lower end portion 22D of the back pad 22 is disposed above the convex portion 20D of the cushion pad 20. As a result, when the seat back 14 is in the first position A1, the boundary portion between the cushion pad 20 and the back pad 22 has a smooth shape, and the unevenness generated at the boundary portion between the cushion pad 20 and the back pad 22 can be reduced. As a result, a good fitting feeling can be obtained in the hip portion P1 and the vicinity of the waist of the seated occupant P.

[0029] Also, as shown in FIGS. 1 to 3, when the seat back 14 is reclined from the first position A1 toward the second position A2, as the reclining angle increases toward the rear side of the seat back 14, the lower end portion 22D of the back pad 22 moves rearward and downward with respect to the convex portion 20D. As a result, even when the seat back 14 is reclined rearward, the boundary portion between the cushion pad 20 and the back pad 22 has a smooth shape, and the unevenness generated at the boundary portion between the cushion pad 20 and the back pad 22 can be reduced. As a result, it is possible to reduce the impairment of the fitting feeling in the hip portion P1 and the vicinity of the waist of the seated occupant P during reclining.

[0030] Further, in the present embodiment, the cushion-side covering portion 24A and the back-side covering portion 24B are configured to be continuously connected without interruption. In this configuration, when the seat back 14 is reclined rearward, the unevenness generated in the skin 24 at the portion corresponding to the boundary portion between the cushion-side covering portion 24A and the back-side covering portion 24B can be reduced. As a result, it is possible to reduce the impairment of the fitting feeling in the hip portion P1 and the vicinity of the waist of the seated occupant P during reclining.

[0031] In addition, in the present embodiment, the rotation center C of the seat back 14 is located at a position close to the upper surface of the cushion-side covering portion 24A of the skin 24. Specifically, the rotation center C of the seat back 14 is located in the range from 75 mm above the upper surface of the cushion-side covering portion 24A of the skin 24 to 75 mm below the upper surface of the cushion-side covering portion 24A of the skin 24 on the seat upper side. In this configuration, compared with the configuration in which the position of the rotation center C of the seat back 14 is located outside the above range, the amount of deformation of the skin 24 accompanying the reclining of the seat back 14 can be reduced. Thereby, it is possible to suppress a change in the design of the skin 24 accompanying the reclining of the seat back 14 and a change in the sitting feeling accompanying the deformation of the skin 24.

[0032] In addition, in the present embodiment, when the seat back 14 is reclined rearward, the lower end portion 22D of the back pad 22 is disposed within the step portion 20F formed in the cushion pad 20. In this configuration, when the seat back 14 is reclined toward the second position A2 side, it is possible to suppress strong interference between the lower end portion 22D of the back pad 22 and the cushion pad 20.

[0033] Note that, in the present embodiment described above, an example in which the step portion 20F as the relief shape portion is formed in the cushion pad 20 has been described, but the present invention is not limited to this. Whether or not to form the relief shape portion in the cushion pad 20 may be appropriately set in consideration of reaction forces and the like associated with interference between the lower end portion 22D of the back pad 22 and the cushion pad 20.

[0034] In addition, in the present embodiment, an example in which the rotation center C of the seat back 14 with respect to the seat cushion 12 is located above the upper surface of the cushion pad 20 has been described, but the present invention is not limited to this. Whether or not to set the rotation center C of the seat back 14 with respect to the seat cushion 12 above the upper surface of the cushion pad 20 may be appropriately set in consideration of the material of the skin 24 and the like.

[0035] In addition, in this embodiment, an example in which the cushion-side covering portion 24A and the back-side covering portion 24B are continuously connected without interruption has been described. However, the present invention is not limited to this. Whether to configure the cushion-side covering portion 24A and the back-side covering portion 24B to be continuously connected without interruption may be appropriately set in consideration of the design of the vehicle seat 10 (skin 24) and the like.

[0036] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above, and it goes without saying that various modifications other than the above can be implemented without departing from the gist of the present invention.

Explanation of reference numerals

[0037] 10 Vehicle seat 12 Seat cushion 14 Seat back 20 Cushion pad 20D Convex portion 20E Flat surface portion (the surface of the cushion pad on the seat upper side) 20F Step portion (relief shape portion) 22 Back pad 22D End portion of the back pad on the seat lower side 24 Skin C Rotation center

Claims

1. A seat cushion having a cushion pad that supports the buttocks of a seated occupant from below the seat, a seat back having a back pad that supports the back of the seated occupant from behind the seat, comprising: A vehicle seat in which the seat back reclines in a direction to change the inclination of the seat back with respect to the seat cushion about a center of rotation on the front side of the seat with respect to the end of the back pad on the lower side of the seat, In a cross-sectional view obtained by cutting the seat cushion at a plane formed by the vertical and longitudinal directions of the seat at the center in the seat width direction, the portion of the cushion pad on the rear side of the seat has a shape having a convex portion that protrudes upward from the seat, In a state where the seat back is disposed at a position where it can support the back of a seated occupant in a posture where the front side of the seat is visible, the end of the back pad on the lower side of the seat is disposed above the convex portion with respect to the seat, A vehicle seat in which, as the reclining angle increases toward the rear side of the seat back, the end of the back pad on the lower side of the seat moves toward the rear side and the lower side with respect to the convex portion.

2. The vehicle seat according to claim 1, wherein the surface on the occupant side of the cushion pad and the surface on the occupant side of the back pad are covered with a skin that is continuous in a range from the cushion pad to the back pad.

3. In a cross-sectional view obtained by cutting the seat cushion at a plane formed by the vertical and longitudinal directions of the seat at the center in the seat width direction, the center of rotation is located in a range from a position 75 mm above the seat to a position 75 mm below the seat with respect to the upper surface of the skin on the upper side of the seat. The vehicle seat according to claim 2.

4. On the rear side of the seat with respect to the portion where the convex portion is formed in the cushion pad, a relief-shaped portion is formed where the end of the back pad on the lower side of the seat is disposed when the seat back reclines in the direction in which it falls. The vehicle seat according to claim 1.

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