JP6601159B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat having a lower seat back and an upper seat back tiltable with respect to the lower seat back.

  2. Description of the Related Art Conventionally, a vehicle seat is known in which a seat back is vertically divided into a lower seat back and an upper seat back, and the upper seat back can be tilted with respect to the lower seat back with reference to the dividing line ( Patent Document 1). In such a vehicle seat, the upper seat back is tilted forward with respect to the lower seat back while the entire seat back is tilted backward by the reclining mechanism, so that the driver can relax in the seat back. It is possible to fit. Further, the vehicle seat is configured such that the direction of the front surface of the seat back always faces forward regardless of the driver's steering.

JP 2003-190217 A

  However, in the prior art, since the front of the seat back is always facing forward, when the driver performs turning steering, a part of the body (a part around the left or right shoulder) is separated from the seat back. There is a problem that it becomes far away and steering becomes difficult.

  Accordingly, an object of the present invention is to provide support for a driver's steering in a vehicle seat in which a seat back is divided into upper and lower parts.

In order to solve the above-described problem, a vehicle seat according to the present invention includes a lower seat back and an upper seat back provided on the lower seat back and tiltable with respect to the lower seat back. Have.
The upper seat back is provided with an upper posture changing device that changes the direction of at least a part of the upper seat back to the left and right according to a steering operation.

  According to this configuration, since the direction of at least a part of the upper seat back can be changed to the left and right according to the steering operation of the driver, when the driver performs the turning steering, a part of the body is moved to the upper seat back. It is possible to prevent the driver from leaving the vehicle and to support the driver's steering.

  Further, in the above-described configuration, the upper posture changing device can be configured to act on a first portion that is a part of a side portion of the upper seat back to advance and retract the first portion in the front-rear direction. .

  According to this, since the upper posture changing device acts on the first part which is a part of the side part of the upper seat back, a part of the side part of the driver's body can be pushed well by the first part. Thus, it is possible to satisfactorily support the driver's steering.

  In the above-described configuration, the amount by which the first part is advanced by the upper posture changing device can be reduced as the upper seat back is tilted forward with respect to the lower seat back.

  When the upper seat back is greatly tilted forward with respect to the lower seat back, the distance between the steering and the upper seat back is smaller than when the upper seat back is tilted with respect to the lower seat back. In this case, for example, if the amount by which the first part is advanced by the upper posture changing device is constant, the driver's arm is pushed too far forward by the first part and the driver feels uncomfortable. On the other hand, as the upper seat back is tilted forward, the amount by which the first portion is advanced by the upper posture changing device is reduced, so that the driver becomes more uncomfortable even when the distance between the steering and the upper seat back is reduced. I can suppress feeling.

  In the above-described configuration, the lower seat back may be provided with a lower posture changing device that changes the direction of at least a part of the lower seat back to the left and right according to a steering operation.

  Accordingly, the driver's steering can be suitably supported by the upper posture changing device and the lower posture changing device.

  Further, in the above-described configuration, the lower posture changing device is configured to act on a second portion that is a part of a side portion of the lower seat back and to advance and retract the second portion in the front-rear direction. Can do.

  According to this, since the lower posture changing device acts on the second part which is a part of the side part of the lower seat back, the part of the side part of the driver's body is separated by the first part and the second part. It can push well and can perform a driver's steering support well.

  In the above-described configuration, the distance from the first part to the lower surface of the upper seat back is made smaller than the distance from the first part to the upper surface of the upper seat back, and the second part to the lower side The distance to the upper surface of the seat back may be smaller than the distance from the second portion to the lower surface of the lower seat back.

  According to this, since the first part and the second part on which the force of each posture changing device acts are arranged close to the boundary line between the upper seat back and the lower seat back, each posture changing device gives the driver On the other hand, the applied force can be concentrated in one place, and the driver's steering can be well supported.

  Further, in the above-described configuration, the upper posture changing device and the lower posture changing device include a pressure receiving member disposed behind the driver, and left and right sides connected to the left side and the right side of the pressure receiving member, respectively. A link member, and left and right actuators that move the left or right side of the pressure receiving member forward and backward by rotating each link member, and the output shaft of the actuator of the upper posture changing device is The output shaft of the actuator of the lower posture changing device may be directed upward.

  According to this, since the upper link member and pressure receiving member and the lower link member and pressure receiving member can be brought close to each other, the force applied to the driver from each posture changing device can be concentrated in one place. Thus, the steering of the driver can be well supported.

  ADVANTAGE OF THE INVENTION According to this invention, a driver | operator's steering support can be performed in the vehicle seat by which the seat back was divided | segmented up and down.

  Further, according to the present invention, the upper posture changing device is configured to act on the first portion that is a part of the side portion of the upper seat back, so that a part of the side portion of the driver's body is changed to the first portion. It can be pushed well by one part, and the driver's steering can be supported well.

  In addition, according to the present invention, even when the distance between the steering and the upper seat back is reduced by reducing the amount by which the first position is advanced by the upper posture changing device as the upper seat back is tilted forward, It can be suppressed that the person feels uncomfortable.

  Further, according to the present invention, by providing the lower posture changing device in the lower seat back, the upper posture changing device and the lower posture changing device can suitably support the steering of the driver.

  Further, according to the present invention, the lower posture changing device is configured to act on the second portion that is a part of the side portion of the lower seat back, thereby a part of the side portion of the driver's body. Can be favorably pushed by the first part and the second part, and the steering of the driver can be favorably supported.

  According to the present invention, the distance from the first part to the lower surface of the upper seat back is made smaller than the distance from the first part to the upper surface of the upper seat back, and from the second part to the upper surface of the lower seat back. Is made smaller than the distance from the second part to the lower surface of the lower seat back, the force applied to the driver from each posture changing device can be concentrated in one place. Steering can be supported well.

  Further, according to the present invention, the output shaft of the actuator of the upper posture change device is directed downward and the output shaft of the actuator of the lower posture change device is directed upward, so that the upper link member and the pressure receiving member and the lower Since the link member and the pressure receiving member can be brought close to each other, the force applied to the driver from each posture changing device can be concentrated in one place, and the driver's steering can be well supported.

1 is a perspective view of a vehicle seat as a vehicle seat according to an embodiment. It is a perspective view of a seat frame built in a vehicle seat. It is an expansion perspective view which shows a rocking | fluctuation mechanism. It is a disassembled perspective view which disassembles and shows a rocking | fluctuation mechanism. It is a top view which shows operation | movement of a rocking | fluctuation mechanism. It is the perspective view which looked at the seat back pad from the back side. It is a figure which shows a rocking | fluctuation mechanism and a motion of a seat back pad when a vehicle is a straight drive state. It is a figure which shows a rocking | fluctuation mechanism and a motion of a seat back pad when steering is rotated to the right to a predetermined angle. It is a figure which shows a motion of a rocking | fluctuation mechanism and a seat back pad when steering is rotated to the right to an angle larger than a predetermined angle. It is a figure which shows tilting operation | movement of the upper side seat back with respect to a lower side seat back. It is a figure which shows the modification of a seat back pad.

Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, a vehicle seat S as an example of a vehicle seat is a seat used in a driver's seat of an automobile, and mainly includes a seat cushion S1, a seat back S2, and a headrest S3. Yes.

  The seat back S2 includes a lower seat back S21 and an upper seat back S22 provided on the lower seat back S21 and tiltable with respect to the lower seat back S21. The lower seat back S21 is provided with a lower posture changing device M1 that changes the direction of the upper part of the front surface of the lower seat back S21 to the left and right according to the operation of the steering ST. The upper seat back S22 is provided with an upper posture changing device M2 that changes the orientation of the lower part of the front surface of the upper seat back S22 to the left and right in accordance with the operation of the steering wheel ST22.

  The vehicle seat S is provided with an angle detection sensor 72 that detects an angle of the upper seat back S22 with respect to the lower seat back S21, and a vehicle on which the vehicle seat S is mounted detects a steering angle of the steering ST. A steering angle sensor 71 and a control device 100 that controls each posture changing device M1, M2 based on signals from the steering angle sensor 71 and the angle detection sensor 72 are provided.

  A seat frame F as shown in FIG. 2 is built in the seat cushion S1 and the seat back S2. The seat frame F is mainly composed of a seat cushion frame F1 constituting a frame of the seat cushion S1 and a seat back frame F2 constituting a frame of the seat back S2. The seat cushion S1 is configured by covering the seat cushion frame F1 with a seat cushion pad made of a cushion material such as urethane foam and a skin material made of synthetic leather or fabric. The seat cushion frame F1 is installed on the floor of the automobile via the slide rail SL. Thereby, the vehicle seat S can adjust the front-rear position.

The seat back S2 is configured by covering the seat back frame F2 with a seat back pad 60 (see FIG. 6) made of a cushioning material and a skin material made of synthetic leather or fabric. The lower portion of the seat back frame F2 is rotatably connected to the rear portion of the seat cushion frame F1 via a reclining mechanism (not shown). As a result, the seat back S2 can be tilted back and forth with respect to the seat cushion S1.
In the present specification, front and rear, left and right, and top and bottom are based on an occupant seated on the vehicle seat S in a state where the seat back S2 is not tilted by the reclining mechanism.

  The seat back frame F2 includes a lower frame 11 constituting the lower seat back S21 and an upper frame 12 constituting the upper seat back S22. The lower frame 11 and the upper frame 12 are configured by bending a pipe material.

  The lower frame 11 has a U-shape that is open on the upper side, and includes a side frame 11C that extends vertically and is separated from the left and right, and a lower frame 11D that connects the lower ends of the side frames 11C. On the upper part of the left and right side frames 11C, a lower posture changing device M1 is provided. The lower attitude changing device M1 is supported by a right swing mechanism 50R fixed to the right side frame 11C, a left swing mechanism 50L fixed to the left side frame 11C, and left and right swing mechanisms 50R and 50L. And an S spring 41 as an example of a pressure receiving member. In FIG. 2, the swinging mechanisms 50R and 50L are simplified as appropriate.

  The upper frame 12 has a U-shape that opens to the lower side, and includes a side frame 12C that extends vertically and is separated from the left and right, and an upper frame 12D that connects the upper ends of the side frames 12C. A bracket 12A is welded to the lower ends of the left and right side frames 12C. The bracket 12A is connected to upper ends of the left and right side frames 11C of the lower frame 11 so as to be rotatable about an axis B1 along the left-right direction.

  Under the left and right side frames 12C, an upper posture changing device M2 having a structure substantially similar to that of the lower posture changing device M1 is provided. The upper attitude changing device M2 is supported by a right swing mechanism 50R fixed to the right side frame 12C, a left swing mechanism 50L fixed to the left side frame 12C, and left and right swing mechanisms 50R and 50L. And an S spring 41 as an example of a pressure receiving member. Since the lower posture changing device M1 and the upper posture changing device M2 have a vertically symmetric structure, in the following description, the lower posture changing device M1 will be described as a representative, and the upper posture changing device M2 will be appropriately described. Description is omitted.

  The S spring 41 extends in the left-right direction while being bent a plurality of times in the vertical direction within a predetermined range in the vertical direction, and is disposed at a position where the seat back pad 60 can be directly supported (see FIG. 7). Specifically, the S spring 41 of the upper posture changing device M2 is arranged at a position around the occupant's shoulder, and the S spring 41 of the lower posture changing device M1 is arranged at a position around the chest.

  The S spring 41 is disposed between a plurality of straight portions 41a extending in the vertical direction and spaced apart in the left-right direction, and two adjacent straight portions 41a, 41a, and above or below. And a plurality of bent portions 41b that protrude toward the surface. Specifically, the plurality of bent portions 41b arranged on each linear portion 41a are convex upward, connected to the upper ends of two adjacent linear portions 41a and 41a, and below each linear portion 41a. The plurality of arranged bent portions 41b are convex downward and are connected to the lower ends of the two adjacent linear portions 41a and 41a.

  The plurality of upper bent portions 41b are arranged at the same position in the vertical direction, and the plurality of lower bent portions 41b are arranged at the same position in the vertical direction. Of the plurality of bent portions 41b, the bent portion 41b closest to the right swing mechanism 50R and the bent portion 41b closest to the left swing mechanism 50L are convex toward the direction away from the actuator 51 described later. Yes. That is, the S spring 41 of the lower posture changing device M1 is convex upward, and the S spring 41 of the upper posture changing device M2 is convex downward.

  Of the plurality of straight portions 41a, the straight portion 41a closest to the right swing mechanism 50R and the straight portion 41a closest to the left swing mechanism 50L are located on the inner side in the left-right direction with respect to the base end portion. It is bent like this. Specifically, each linear portion 41a closest to each of the swing mechanisms 50R and 50L has a base end portion extending downward from the bent portion 41b, and an inclination extending from the lower end of the base end portion toward the inner side and the lower side in the left-right direction. And a tip portion extending downward from the lower end of the inclined portion. And the base end part of each linear part 41a is rotatably supported by each rocking | fluctuation mechanism 50R, 50L.

  The right swing mechanism 50R is a mechanism for moving the right end portion of the S spring 41 forward and backward, and is provided between the right side frame 11C and the right end portion of the S spring 41. The left swing mechanism 50L is a mechanism for moving the left end portion of the S spring 41 forward and backward, and is provided between the left side frame 11C and the left end portion of the S spring 41. Each swing mechanism 50R, 50L is controlled by the control device 100 so that the S spring 41 swings in the same direction as the turning direction of the vehicle. ) Can be received by the S spring 41.

  Note that various methods can be adopted as a control method by the control device 100. As an example, for example, a lateral acceleration or a turning direction is calculated based on signals from a wheel speed sensor and a steering angle sensor 71 (not shown), and when the lateral acceleration exceeds a predetermined threshold, There is a method in which the outer swing mechanism is operated and the outer end of the S spring 41 in the turning direction is pushed forward by the swing mechanism.

  Further, the control device 100 controls the lower posture changing device M1 and the upper posture changing device M2 to operate with substantially the same operation amount. Specifically, when the S spring 41 is swung by a predetermined angle toward one of the left and right in accordance with the operation of the steering ST, the S spring 41 is moved by the left and right other swing mechanism of the lower posture changing device M1. The amount by which the one end is advanced is a predetermined amount, and the amount by which the other end of the S spring 41 is advanced by the left and right other swing mechanism of the upper posture changing device M2 is substantially the same as the predetermined amount.

  Further, the control device 100 determines, based on the signals from the steering angle sensor 71 and the angle detection sensor 72, the amount by which the end portion of the S spring 41 is advanced by the posture changing devices M1 and M2 with respect to the lower seat back S21. Thus, the upper seat back S22 is configured to become smaller as it leans forward. Specifically, when the angle of the upper seat back S22 relative to the lower seat back S21 is 0 ° (when the upper seat back S22 is at the position of the two-dot chain line in FIG. 10), the control device 100 The operation amount of each posture changing device M1, M2 corresponding to the operation is defined as a first operation amount. On the other hand, when the angle of the upper seat back S22 with respect to the lower seat back S21 is larger than 0 ° (when the upper seat back S22 is at the position indicated by the solid line in FIG. 10), the control device 100 causes the steering ST to The operation amount of each posture changing device M1, M2 according to the operation is set to a second operation amount smaller than the first operation amount. Note that the operation amounts of the posture changing devices M1 and M2 may be set so as to be inversely proportional to the angle of the upper seat back S22, and the first seat angle is set to the first angle when the angle of the upper seat back S22 is from 0 ° to the first angle. The operation amount may be set appropriately according to the angle range so that the operation amount is set to the second operation amount from the first angle to the second angle.

  The swing mechanisms 50R and 50L of the lower posture changing device M1 are arranged so as to be offset downward with respect to the center CL of the S spring 41 in the vertical direction. In other words, in the lower attitude changing device M1, the distance from the lower end of each swing mechanism 50R, 50L to the center CL is longer than the distance from the upper end of each swing mechanism 50R, 50L to the center CL. On the other hand, the swinging mechanisms 50R and 50L of the upper posture changing device M2 are arranged so as to be offset upward with respect to the center (not shown) of the S spring 41 in the vertical direction. In other words, in the upper posture changing device M2, the distance from the upper end to the center of each swing mechanism 50R, 50L is longer than the distance from the lower end to the center of each swing mechanism 50R, 50L.

  In other words, output shafts 51C (see FIG. 3) of two actuators 51, which will be described later, constituting the lower posture changing device M1 are directed upward and output shafts of the two actuators 51 constituting the upper posture changing device M2. 51C is directed downward.

  Each swing mechanism 50R, 50L has a symmetrical structure. In the following description, the structure of the right swing mechanism 50R will be described as a representative, and description of the left swing mechanism 50L will be omitted.

  As shown in FIGS. 3 and 4, the right swing mechanism 50 </ b> R mainly includes an actuator 51, a holding bracket 52, a first link member 53, a second link member 54, and a torsion spring 55. It is configured.

  The actuator 51 is a drive source for rotating the first link member 53 and the second link member 54. The actuator 51 includes a stepping motor 51A, a gear box 51B, and an output shaft 51C, and the output shaft 51C extends in the vertical direction. It is arranged along. The driving force from the stepping motor 51A is decelerated by the gear box 51B and transmitted to the output shaft 51C, so that the output shaft 51C rotates at a predetermined angle.

  The holding bracket 52 is a substantially semicircular plate-like member, and is fixed to the side frame 11C by welding or the like via an attachment surface 52A formed in an arc shape. In addition, the holding bracket 52 is formed with a through hole 52B for allowing the output shaft 51C of the actuator 51 to pass therethrough. An upper end surface 51D of the actuator 51 is fixed to the lower surface of the holding bracket 52 by screws or the like (not shown).

  The first link member 53 is a plate-like member formed in a long shape, and one end thereof is fixed to the output shaft 51C of the actuator 51, so that the other end is centered on the output shaft 51C in the front-rear direction. It can swing (see FIG. 5). That is, the first link member 53 is rotatable with respect to the side frame 11C.

  Specifically, a cross-sectional view D-type engagement hole 53A that engages with a cross-sectional view D-type tip of the output shaft 51C is formed at one end of the first link member 53, and the other end side has a first An insertion hole 53 </ b> B into which a stepped bolt 56 and a collar 57 that become the swing center of the two link member 54 are inserted is formed. Further, two rectangular plate-like regulating walls 58 that define the swing range of the second link member 54 are fixed to one end side and the other end side of the insertion hole 53B in the first link member 53, respectively. One rectangular fitting hole 53C is formed.

  Accordingly, it is possible to restrict the second link member 54 from swinging with respect to the first link member 53 with the two restriction walls 58. Further, a fixing hole 53D for fixing one end portion 55A of the torsion spring 55 is formed between the engagement hole 53A and the insertion hole 53B in the first link member 53.

  The second link member 54 is rotatably provided on the first link member 53 by the stepped bolt 56, the collar 57, and the nut 59 described above. Specifically, an insertion hole 54 </ b> A through which the shaft portion 56 </ b> A of the stepped bolt 56 is inserted is formed at one end portion of the second link member 54. On the other hand, the stepped bolt 56 has a shaft portion 56A and a medium diameter portion 56C that has a larger diameter than the shaft portion 56A and a smaller diameter than the head portion 56B.

  The collar 57 is rotatably supported in the insertion hole 53B of the first link member 53, and the cylindrical portion 57A through which the shaft portion 56A of the stepped bolt 56 is inserted, and radially outward from the upper end of the cylindrical portion 57A. And an extending flange portion 57B. The cylindrical portion 57 </ b> A is formed so as to slightly protrude from the lower surface of the first link member 53 in a state where the flange portion 57 </ b> B is in contact with the upper surface of the first link member 53.

  The flange portion 57 </ b> B functions as a retaining member that sandwiches and supports the second link member 54 between the intermediate diameter portion 56 </ b> C of the stepped bolt 56 and suppresses the collar 57 from falling downward from the first link member 53. ing. The nut 59 is fastened to the lower end of the collar 57 by being screwed into the shaft portion 56A (screw portion) of the stepped bolt 56 protruding downward from the lower end of the cylindrical portion 57A of the collar 57. . The nut 59 functions as a retaining member that prevents the collar 57 from being pulled upward from the first link member 53 in a state where the nut 59 is fastened to the collar 57.

  That is, the second link member 54 can swing integrally with the first link member 53 together with the stepped bolt 56, the collar 57 and the nut 59. Further, as shown in FIG. 5, the end portion of the S spring 41 described above is rotatable at the other end portion of the second link member 54 (the end portion opposite to the insertion hole 54 </ b> A: hereinafter, the leading end portion). A connection hole 54B is formed to engage with.

  As a result, when the first link member 53 swings forward from the rear initial position (solid line position), the S link 41 restricts the distal end portion of the second link member 54 from moving outward in the left-right direction. Thus, the second link member 54 swings away from (opens) the first link member 53. When the first link member 53 swings from the front position (the position indicated by the two-dot chain line) to the initial position, the second link member 54 approaches (closes) the first link member 53 by a torsion spring 55 described later. ) Swings in the) direction.

  As shown in FIG. 4, a fixing hole 54 </ b> C for fixing the other end portion 55 </ b> B of the torsion spring 55 is formed between the insertion hole 54 </ b> A and the connection hole 54 </ b> B in the second link member 54.

  The torsion spring 55 is disposed between the first link member 53 and the second link member 54 (mechanistically), and generates a biasing force that pulls the first link member 53 and the second link member 54 together. Is configured to do. That is, the torsion spring 55 is configured to urge the second link member 54 to an initial position (position indicated by a solid line in FIG. 5) with respect to the first link member 53. Thereby, the second link member 54 can be returned to the initial position by the urging force of the torsion spring 55.

  Specifically, the torsion spring 55 includes a coil portion 55C, an L-shaped first arm portion 55D extending radially outward from the lower end of the coil portion 55C, and extending radially outward from the upper end of the coil portion 55C. And an L-shaped second arm portion 55E extending downward.

  The coil portion 55 </ b> C of the torsion spring 55 is disposed so as to surround the medium diameter portion 56 </ b> C (the rotation shaft of the second link member 54 on the first link member 53 side). Accordingly, for example, the right-side swing mechanism 50R can be made more compact than a structure in which the coil portion of the torsion spring is disposed so as not to surround the rotation shaft of the second link member.

  As shown in FIG. 6, the seat back pad 60 includes a lower pad P <b> 1 supported in a state where it covers the lower frame 11 from the front side, and an upper side supported in a state where it covers the upper frame 12 from the front side. And a pad P2.

  The lower pad P1 includes a cushion member P11 made of urethane foam or the like, and a hardly deformable member P12 that is harder to deform than the cushion member P11. The cushion member P11 includes a base portion 61 disposed between the occupant and the seat back frame F2, a left side portion 63 and a right side portion 64 extending rearward from the left end portion and the right end portion of the base portion 61, and a rear portion of the left side portion 63. A left flange portion 66 extending inward in the left-right direction from the end portion and a right flange portion 67 extending inward in the left-right direction from the rear end portion of the right side portion 64 are integrally provided.

  The upper pad P2 has substantially the same structure as the lower pad P1, although the size and shape are different from the lower pad P1. Hereinafter, parts having substantially the same structure as the parts of the lower pad P1 are denoted by the same reference numerals.

  The upper pad P2 includes a cushion member P21 made of urethane foam or the like, and a hardly deformable member P22 that is harder to deform than the cushion member P21. The cushion member P21 includes a base portion 61 disposed between the occupant and the seat back frame F2, an upper portion 62, a left portion 63, and a right portion 64 extending rearward from the upper end portion, the left end portion, and the right end portion of the base portion 61. An upper flange portion 65 extending downward from the rear end portion of the upper portion 62, a left flange portion 66 extending inward in the left-right direction from the rear end portion of the left side portion 63, and inward in the left-right direction from the rear end portion of the right side portion 64. An extending right flange portion 67 is integrally provided.

  The hardly deformable members P12 and P22 are rectangular sheet-like members that are long in the left-right direction, and are made of, for example, a resin plate-like member or a cushion material harder than the cushion members P11 and P21. Is provided. Specifically, the hardly deformable member P12 constituting the lower pad P1 is provided on the upper part of the base portion 61 of the lower pad P1, and the hardly deformable member P22 constituting the upper pad P2 is provided on the base portion 61 of the upper pad P2. It is provided at the bottom. As a method for manufacturing such a seat back pad 60, for example, after setting the hardly deformable members P12 and P22 in the mold for forming the cushion members P11 and P21, the material of the cushion members P11 and P21 is injected into the mold. The method of doing is mentioned.

  As shown in FIG. 7, the hardly deformable members P <b> 12 and P <b> 22 arranged vertically are arranged at positions adjacent to the S springs 41 arranged vertically in the front-rear direction. 7 to 9, for the sake of convenience, the S spring 41 is simplified and illustrated, and only the lower structure is illustrated.

  Specifically, the hardly deformable members P12 and P22 are larger than the S spring 41 in the up and down direction, and the S spring 41 is disposed within the range of the hardly deformable members P12 and P22 in the up and down direction. The hard-to-deform members P12 and P22 and the S spring 41 may be arranged so as to contact each other when the occupant leans against the seat back pad 60. For example, the occupant leans against the seat back pad 60. In a state where there is not, they may be arranged with a slight gap therebetween or in contact with each other.

  The base portion 61 has a support surface 61A that supports the back of the occupant. Left and right side support portions 68L and 68R are integrally provided on the left and right sides of the base portion 61 so as to protrude forward from the support surface 61A and support the left and right arms of the occupant from the left and right outer sides. The left flange portion 66 and the right flange portion 67 wrap around the back side of the seat back frame F <b> 2 and sandwich the seat back frame F <b> 2 with the base portion 61. The structure around the base portion 61 is substantially the same as that of the upper pad P2.

Next, the operation of the swing mechanisms 50R and 50L will be described.
As shown in FIGS. 7 to 9, for example, when the vehicle is turned in the right direction (clockwise in the figure), the upper and lower two left-side swing mechanisms 50L swing forward, whereby the upper and lower two S springs 41 are provided. Swings clockwise in the figure. As a result, the left side PL of the hardly deformable members P12 and P22 is pushed by a larger amount of movement than the right side by the two S springs 41 that oscillate, and a part of each support surface 61A (occupant) The portion near the shoulder and chest) is inclined toward the right side, so that the centrifugal force applied to the occupant can be satisfactorily received by the support surface 61A. Here, the left side portion PL of the hardly deformable member P12 is an example of a second portion on which the lower posture changing device M1 acts, and as shown in FIG. 6, the base portion 61 of the lower pad P1. The upper part (a part) of the left side part is configured. Further, the left side portion PL of the hardly deformable member P22 is an example of a first portion that is a portion on which the upper posture changing device M2 acts, and a lower portion (partly) of the left side portion of the base portion 61 of the upper pad P2. ).

  The distance from the side part PL corresponding to the first part to the lower surface of the upper pad P2 (upper seat back S22) is the distance from the side part PL corresponding to the first part to the upper surface of the upper pad P2 (upper seat back S22). Is smaller than The distance from the side part PL corresponding to the second part to the upper surface of the lower pad P1 (lower seat back S21) is the same as the distance from the side part PL corresponding to the second part to the lower pad P1 (lower seat back S21). ) Is smaller than the distance to the bottom surface. That is, each side part PL on which the force of each posture changing device M1, M2 acts is arranged near the boundary line between the upper seat back S22 and the lower seat back S21.

  When the vehicle is turned leftward, the right side portions of the hardly deformable members P12 and P22 correspond to the first part and the second part, respectively, contrary to the above.

  Further, when swinging the two upper and lower S springs 41 as described above, the control device 100 operates the two upper and lower left swing mechanisms 50L with the same operation amount, and therefore, the control device 100 and the support surface 61A of the upper pad P2 It is possible to suppress the occurrence of a step between the support surface 61A of the lower pad P1 and to prevent the passenger from feeling uncomfortable.

  As shown in FIG. 10, the control device 100 changes each posture when the forward inclination angle of the upper seat back S22 is large (see the solid line) compared to when the forward inclination angle is small (see the two-dot chain line). The operation amount of the devices M1 and M2 is reduced. Here, when the forward tilt angle of the upper seat back S22 is large, the distance between the steering ST and the upper seat back S22 is smaller than when the forward tilt angle is small. In this case, for example, if the operation amount of each posture changing device is constant regardless of the forward tilt angle, the driver's arm is pushed forward by each posture changing device and the driver feels uncomfortable. On the other hand, as the upper seat back S22 tilts forward, the operation amount of each of the posture change devices M1 and M2 is reduced, so that even when the distance between the steering ST and the upper seat back S22 becomes smaller, the driver becomes more uncomfortable. You can suppress the feeling.

  In addition, the effect mentioned above presupposes the state which inclined the lower seat back S21 back somewhat by the reclining mechanism. For this reason, the control device 100 may be configured to perform the above-described control when the lower seat back S21 is inclined at a predetermined angle later from the standing state (a state substantially along the vertical direction). Specifically, a sensor for detecting a rearward tilt angle from the standing state of the lower seat back S21 is provided, and the control device 100 operates the posture changing devices M1 and M2 in the range of the rearward tilt angle from 0 ° to a predetermined angle. When the amount is constant (a value smaller than the maximum value) and the rearward tilt angle is equal to or larger than the predetermined angle, the operation amount of each posture changing device M1, M2 is reduced as the upper seat back S22 tilts forward. It may be configured.

As described above, according to this embodiment, the following effects can be obtained.
Since the orientation of the lower part of the upper seat back S22 and the upper part of the lower seat back S21 can be changed to the left and right according to the driver's steering operation, when the driver performs turning steering, a part of the body is placed on the upper seat. The separation from the back S22 and the lower seat back S21 can be suppressed. Therefore, the driver's steering can be supported in the vehicle seat S in which the seat back S2 is divided vertically.

  Each posture changing device M1, M2 is configured to operate on the first part or the second part (side part PL) which is a part of the side part of the upper seat back S22 or the lower seat back S21. A part of the side of the person's body can be favorably pushed by the first part and the second part, and the driver can be favorably supported for steering.

  As the upper seat back S22 tilts forward, the operating amount of each of the posture changing devices M1 and M2 is reduced, so that the driver feels uncomfortable even when the distance between the steering ST and the upper seat back S22 is reduced. Can be suppressed.

  Since the posture change devices M1 and M2 are provided in both the upper seat back S22 and the lower seat back S21, the posture change devices M1 and M2 can suitably support the steering of the driver.

  Since the first part and the second part (each side part PL) on which the force of each posture changing device M1, M2 acts are arranged close to the boundary line between the upper seat back S22 and the lower seat back S21, The force applied to the driver from the change devices M1 and M2 can be concentrated in one place, and the driver's steering can be favorably supported.

  By turning the output shaft 51C of the actuator 51 of the upper posture change device M2 downward and the output shaft 51C of the actuator 51 of the lower posture change device M1 upward, the upper link members 53 and 54 and the S spring 41 The lower link members 53 and 54 and the S spring 41 can be brought close to each other. Therefore, the force applied to the driver from each posture changing device M1, M2 can be concentrated in one place, and the driver's steering can be well supported.

  Since the S spring 41 that directly supports the seat back pad 60 is swung by the swing mechanisms 50R and 50L, the support surface 61A of the seat back pad 60 is compared with a conventional structure in which a pressure receiving member having a complicated shape is provided. A structure that changes the direction to the left and right can be configured simply.

  Since each bent portion 41b closest to each swing mechanism 50R, 50L bends in a direction away from each swing mechanism 50R, 50L, when the S spring 41 is deformed in the front-rear direction, each bend portion 41b is Interference with the swing mechanisms 50R and 50L can be suppressed.

  By arranging the hardly deformable members P12 and P22 and the S spring 41 adjacent to each other in the front-rear direction, the S spring 41 pushes the hardly deformable members P12 and P22 when the S spring 41 swings. Can be reduced by the deformation of the cushion members P11 and P21, and the support surface 61A can be tilted satisfactorily.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below. In the following description, components that are substantially the same as those in the above-described embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the above embodiment, the upper and lower two S springs 41 are configured to swing in the same direction on the left and right, but the present invention is not limited to this. For example, a switch for turning ON / OFF the control according to the steering operation may be provided, and when this switch is OFF, the upper S spring 41 and the lower S spring 41 may be controlled to operate in different directions. For example, when a switch for executing the massage mode is provided and this switch is turned ON, the upper seat back S22 controls the upper posture changing device M2 so that the left and right orientations of the upper S spring 41 are alternately changed. A massage that twists the driver's body may be performed. In the massage mode, the lower S spring 41 may be in a stopped state, or may be swung so as to face in a direction opposite to the direction of the upper S spring 41.

  In the above embodiment, the posture changing devices M1 and M2 are provided in both the upper seat back S22 and the lower seat back S21. However, the present invention is not limited to this, and for example, the posture changing device is provided only in the upper seat back. Also good.

  In the above embodiment, the lower posture change device M1 and the upper posture change device M2 are controlled to operate with substantially the same operation amount. However, the present invention is not limited to this, and each posture change device has a different operation amount. You may control so that it may operate | move.

  In the embodiment, the upper posture changing device M2 changes the direction of a part (lower part) of the upper seat back S22 to the left and right, and the lower posture changing device M1 changes the direction of a part (upper part) of the lower seat back S21. Although it is configured to change to the left and right, the present invention is not limited to this. For example, the upper posture changing device may be configured to change the orientation of the entire upper seat back to the left and right, and the lower posture changing device may change the orientation of the entire lower seat back to the left and right. It may be configured.

  In the above embodiment, the hardly deformable members P12 and P22 are configured to be pushed only by the S spring 41. However, the present invention is not limited to this, and for example, as shown in FIG. You may comprise so that the hardly deformable members P12 and P22 can be pushed. Specifically, in this embodiment, the hardly deformable members P12 and P22 are adjacent to the second link members 54 of the swing mechanisms 50R and 50L in the front-rear direction. The hardly deformable members P12 and P22 and the second link member 54 only need to be configured to contact at least when the swinging mechanisms 50R and 50L are operated. That is, the hardly deformable members P12 and P22 and the second link member 54 may be arranged with a slight gap therebetween or in contact with each other when the occupant is not leaning against the seat back pad 60. Also good.

  According to this configuration, the hardly deformable members P12 and P22 can be pushed not only by the S spring 41 but also by any of the left and right swing mechanisms 50R and 50L, so the direction of the support surface 61A is changed more favorably. be able to.

  In the above embodiment, the S spring 41 is exemplified as the pressure receiving member. However, the present invention is not limited to this, and may be a coil spring, a plate member made of resin, metal, or the like.

  In the above-described embodiment, the swing mechanisms 50R and 50L are illustrated as devices for advancing and retracting the left side or right side of the pressure receiving member. It may be a device or the like. Further, the number of link members provided in the swing mechanism is not limited to two as in the above embodiment, but may be one or three or more.

  In the above embodiment, the torsion spring 55 is exemplified as a spring that biases the second link member 54 to the initial position with respect to the first link member 53. However, the present invention is not limited to this, and for example, a leaf spring, a wire spring, or the like. Other urging members may be used.

  The specific configuration of the seat frame F (the seat cushion frame F1 and the seat back frame F2) shown in the embodiment is an example, and the present invention is not limited to the configuration of the embodiment. For example, a plate-shaped frame and a pipe material may be appropriately combined.

  In the said embodiment, although the vehicle seat S used by a motor vehicle was illustrated as a vehicle seat, this invention is not limited to this, For example, the sheet | seat used for a ship, an aircraft, etc. It can also be applied to.

M2 Upper posture change device S Vehicle seat S21 Lower seat back S22 Upper seat back ST Steering

Claims (6)

A vehicle seat having a lower seat back and an upper seat back provided on the lower seat back and tiltable with respect to the lower seat back,
The upper seat back is provided with an upper posture changing device that changes the direction of at least a part of the upper seat back to the left or right according to a steering operation ,
The upper posture changing device acts on a first part that is a part of a side portion of the upper seat back, and advances and retracts the first part in the front-rear direction,
The vehicle seat according to claim 1, wherein as the upper seat back is tilted forward with respect to the lower seat back, an amount by which the first position is advanced by the upper posture changing device is reduced . The vehicle according to claim 1, wherein the lower seat back is provided with a lower posture changing device that changes the direction of at least a part of the lower seat back to the left and right according to a steering operation. Sheet. Said lower position changing device acts on the second portion which is a part of the side of the lower seat back, according to claim 2, wherein the advancing and retracting the second portion in the longitudinal direction Vehicle seat. A vehicle seat having a lower seat back and an upper seat back provided on the lower seat back and tiltable with respect to the lower seat back,
The upper seat back is provided with an upper posture changing device that changes the direction of at least a part of the upper seat back to the left or right according to a steering operation,
The lower seat back is provided with a lower posture changing device that changes the direction of at least a part of the lower seat back to the left and right according to a steering operation,
The upper posture changing device acts on a first part that is a part of a side portion of the upper seat back, and advances and retracts the first part in the front-rear direction,
The lower posture changing device acts on a second part that is a part of a side portion of the lower seat back, and advances and retracts the second part in the front-rear direction,
The distance from the first part to the lower surface of the upper seat back is smaller than the distance from the first part to the upper surface of the upper seat back,
The distance from the second portion to the upper surface of the lower seat back, the multiplication product sheet you being smaller than the distance from the second portion to a lower surface of the lower seat back. The upper posture changing device and the lower posture changing device are respectively a pressure receiving member disposed behind the occupant, left and right link members connected to a left side portion and a right side portion of the pressure receiving member, and each of the link members. Left and right actuators for moving the left side or the right side of the pressure receiving member forward and backward by rotating the pressure receiving member, and
Wherein the output shaft of the actuator of the upper position changing device, downwardly directed, the output shaft of the actuator of the lower attitude changing device according to claim claim 2, characterized in that is directed upward 4 The vehicle seat according to any one of the above.   A seat cushion and a headrest are further provided.
  The upper seat back has left and right side frames,
  The upper posture changing device is supported by a right swing mechanism fixed to the right side frame, a left swing mechanism fixed to the left side frame, the right swing mechanism, and the left swing mechanism. An S spring,
  One of the right-side swing mechanism and the left-side swing mechanism is a mechanism for moving an end portion on one side of the S spring in the front-rear direction, and the one side of the side frame on the one side and the one side of the S spring. The vehicle seat according to any one of claims 1 to 5, wherein the vehicle seat is provided between an end of the vehicle and the vehicle seat.

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