JP2008189060A - Seat device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat device having a knuckle mechanism 35 a lower end part of which fluctuates in accordance with turn of a seat back 5 and capable of preventing fluctuation of the lower end part of the seat back 5 from badly influencing interlocking motion of a seat cushion tilting mechanism 7 in interlocking the seat cushion tilting mechanism 7 with turn of the seat back 5. <P>SOLUTION: A gear 64 for tilting is rotated by an electric motor 62 to turn the seat back 5, and the tilting mechanism 7 is actuated by using rotating displacement of this gear 64 for tilting. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a seat device in which a predetermined portion of a seat cushion is moved in accordance with forward or backward tilt of a seat back.

With respect to a vehicle seat, a so-called interlocking tilt is known in which the front end portion of the seat cushion is moved forward and obliquely upward in accordance with the rearward rotation of the seat back, thereby changing the inclination of the seat cushion seat surface. (See Patent Documents 1 and 2). In this interlocking tilt, the arm rotating around the swing center of the seat back and the tilt mechanism of the seat cushion are connected by a link mechanism. Also known is a seat device in which the rear end of the seat back rises as the seat back rotates, and the seat back and the seat cushion are flush with each other when the seat back is tilted to a horizontal position. (See Patent Document 3). It is also known to use a taumel mechanism that combines an internal gear and an external gear with a reclining knuckle of an automobile seat to make it easier to maintain a seat back tilting posture (see Patent Document 4). .
Japanese Patent Laid-Open No. 06-245837 JP-A-62-192114 Japanese Utility Model Publication No. 05-1337 Japanese Patent Laid-Open No. 06-62852

    In the case of a knuckle using the above Taumel mechanism, as shown in FIG. 16, for example, an internal gear A can be provided on the seat cushion frame B and an external gear C can be provided on the seat back frame D. In such a configuration, when the external gear C meshes with the internal gear A and rotates clockwise, the axis of the external gear C rotates around the axis O of the internal gear A (revolves) a. → b → c, and the seat back is rotated rearward. In the figure, for the sake of clarity, the gear ratio of the internal gear A to the external gear C is 9/8, and the axis of the external gear C is around the axis O of the internal gear A. When revolving once, the seat back rotates about 45 degrees backward. The fact that the axis of the external gear C revolves around the axis O of the internal gear A means that the seat back does not have a fixed center of swing and the lower end of the seat back changes when the seat back rotates. That's what it means. In this case, the lower end of the seat back moves back and forth by a distance corresponding to the diameter of the revolution track.

    Normally, the gear ratio is made smaller than 9/8 in order to reduce the seat back turning operation force. Therefore, for example, the axis of the external gear C is rotated while the seat back is rotated 45 degrees backward. Will revolve around the axis O of the internal gear A several times.

    Therefore, in the interlock tilt in which the arm is provided at the lower end of the seat back and the tilt mechanism of the seat cushion is connected by the link mechanism, the tilt of the seat cushion is caused by the forward and backward movement of the lower end of the seat back due to the revolution. The movement is jerky. That is, the tip of the arm cannot move in a circular motion with a constant trajectory, and moves while repeating a reverse movement due to the revolution. By repeating this return, the seat cushion also moves, for example, repeating tilt → stop → tilt → stop, resulting in a sense of discomfort or discomfort to the passenger.

    Accordingly, the present invention relates to a seat device having a knuckle mechanism in which the lower end of the seat back is changed as the seat back rotates, such as a taumel knuckle, and a part or the whole of the seat cushion is interlocked with the rotation of the seat back. In this case, it is an object to prevent the fluctuation of the lower end portion of the seat back from adversely affecting the interlocking.

    In order to solve such a problem, the present invention suppresses the movement of the seat cushion due to the fluctuation of the lower end of the seat back accompanying the rotation of the seat back, thereby smoothing the movement of the seat cushion. A rotation reflecting mechanism was provided.

That is, the invention according to claim 1 is an angle adjustment unit that rotates and holds the seat back from the reference standing position to at least one of the front and rear, and
A cushion actuation mechanism for moving a predetermined part of the seat cushion up and down or back and forth;
A prime mover that moves with the rotation of the seat back and provides a motive force to activate the cushion actuation mechanism;
In a seat device including an interlocking mechanism that transmits the movement of the driving portion to the cushion operating mechanism and interlocks a predetermined portion of the seat cushion with the rotation of the seat back.
The angle adjustment unit does not form a swing center determined by the rotation of the seat back, and causes the lower end of the seat back to fluctuate with the rotation.
In accordance with the rotation of the seat back, there is provided a rotation reflecting mechanism that suppresses the influence due to the fluctuation of the lower end of the seat back and moves the driving portion so that the change in the rotation angle of the seat back is reflected. It is characterized by being.

    Therefore, when the seat back rotates, the movement is reflected on the driving part, the movement of the driving part is transmitted to the cushion operating mechanism by the interlocking mechanism, and the predetermined part of the seat cushion moves up and down or back and forth. In this series of movements, the rotation reflecting mechanism suppresses the influence of fluctuations in the lower end portion of the seat back accompanying the rotation of the seat back when the rotation of the seat back is reflected in the driving portion. Therefore, regardless of the change in the lower end of the seat back, the predetermined portion of the seat cushion operates smoothly reflecting the rotation angle of the seat back.

    Examples of the cushion operation mechanism include a seat surface tilt mechanism that raises the front end of the seat cushion relative to the rear end to change the tilt of the seat surface, and, for example, an ottoman (footrest) suspended from the front end of the seat cushion. ) Can be employed as the ottoman rotation mechanism that rotates and lifts the seat back as the seat back rotates.

The invention according to claim 2 is the invention according to claim 1,
An operation force input unit for rotating the seat back;
The angle adjusting unit is characterized in that an operating force is input from the operating force input unit to rotate the seat back.

    That is, the angle adjusting unit is configured to push the seat back with the back against the bias of the spring in the hinge portion between the seat back and the seat cushion after the occupant releases the positioning lock of the seat back rotation. The operation force is input from the operation input unit (electric motor or manual operation force input knob (dial)), and the seat back is rotated to hold the position. The pivoting operability of the seat back is improved.

The invention according to claim 3 is the invention according to claim 2,
The rotation reflecting mechanism receives the operation force from the operation force input unit and operates with the angle adjustment unit.

    Accordingly, since the rotation of the seat back and the driving of the driving portion (that is, the operation of the cushion operating mechanism) are performed by a common operation force, the change in the rotation angle of the seat back is accurately reflected in the movement of the driving portion. Will be advantageous.

The invention according to claim 4 is the invention according to claim 3,
The interlocking mechanism includes a link that swings in the front-rear direction of the seat for operating the cushion operating mechanism, and the driving unit is connected to the link.

    Therefore, the movement of the prime mover can be transmitted from the interlocking mechanism to the cushion actuating mechanism with a simple configuration.

The invention according to claim 5 is the invention according to claim 4,
The driving part is provided so as to be rotationally displaced about a predetermined axis in accordance with the rotation of the seat back.
The link of the interlocking mechanism is formed with a long hole for preventing the rotational displacement of the driving portion from being transmitted to the cushion operating mechanism when the seat back is within a predetermined rotational angle range. It is characterized by.

    As a result, when the seat back is rotated to a predetermined angle, for example, and the predetermined portion of the seat cushion is in an intended state, the predetermined portion of the seat cushion does not change greatly even if the seat back is further rotated. (Or no change at all). Alternatively, until the seat back is rotated to a predetermined angle, the predetermined portion of the seat cushion is hardly moved (or the movement amount is set to zero), and when the seat back is rotated beyond the predetermined angle, the predetermined value of the seat cushion is set. The part can be moved to the desired state. Therefore, it is advantageous in bringing the predetermined portion of the seat cushion into an optimum state according to the rotation angle of the seat back.

The invention according to claim 6 is the invention according to claim 3,
The rotation reflecting mechanism and the operating force input unit are arranged on the outer side in the seat width direction than the seat back frame connected to the angle adjusting unit.

    Therefore, the problem of interference between the rotation reflecting mechanism and the operation force input unit and the occupant does not occur, so that the degree of freedom in designing the rotation reflection mechanism and the operation force input unit is increased, and good seating of the occupant is ensured. This is advantageous.

The invention according to claim 7 is the invention according to claim 1,
The angle adjusting unit includes an internal gear provided on one of the seat cushion and the seat back, and an external gear that meshes with the internal gear provided on the other and rolls on the inner peripheral side of the internal gear. A Taumel mechanism provided with a toothed gear is used.

    Accordingly, the rotation angle of the seat back can be adjusted with a relatively small force, and the posture retention force of the seat back is increased, so that the posture (tilt angle) of the seat back is inadvertently changed by an external force. This is advantageous in avoiding this.

    As described above, according to the present invention, in the seat device in which the seat back does not have a predetermined swing center and the position of the lower end portion of the seat back varies as the seat pivots, a rotation reflecting mechanism is provided, Since the change of the rotation angle of the seat back is reflected on the driving portion for operating the seat cushion while suppressing the influence due to the change of the lower end of the seat back, the seat is controlled regardless of the change of the lower end of the seat back. The cushion operates smoothly reflecting the rotation angle of the seat back, and it is possible to prevent the passenger from feeling uncomfortable or uncomfortable.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

<Embodiment 1>
(Overall configuration of sheet device)
FIG. 1 shows an embodiment in which a seat device according to the present invention is applied to a reclining type seat 1 installed in an automobile (in the following description, front and rear and right and left of an automobile are simply referred to as front and rear and right and left). A seat cushion 2 on which an occupant sits is attached to a vehicle body floor via a base frame 3 (see FIG. 2), and an ottoman 4 (footrest) is disposed in the lower part of the front end of the seat cushion 2 so as to be retractable. On the other hand, a seat back 5 is disposed so as to extend upward from the vicinity of the rear end of the seat cushion 2, and a headrest 6 is attached to the upper end of the seat back 5.

    In FIG. 2, the cushion structure of the seat cushion 2 is omitted and its frame structure is shown. Side frames 20 and 20 which are press-formed products of steel plates, for example, are provided on the left and right sides of the seat cushion 2, The front end portion and the rear end portion are connected by pipe members 21 and 22, respectively, and springs 23 and 23 made of a wire are bridged to the left and right at an intermediate portion in the front-rear direction. Further, a plate member 25 which is a frame of the ottoman 4 is attached to the pipe member 21 at the front end portion through arms 24 and 24 so as to be swingable.

    Side frames 30 and 30 of the base frame 3 are arranged in close proximity to the lower outer sides of the left and right cushion side frames 20 and 20, respectively. The base side frames 30 and 30 are also press-molded products, and they are connected to each other by front and rear connecting plates 31 and 31 and a pipe member 32.

    Further, a rising portion 30a that is curved and extends upward is formed at the rear end portion of the base side frame 30, and the lower end portion of the frame of the seat back 5 rotates through a knuckle 35 (angle adjusting portion). It is attached as possible.

    The seat device is provided with a tilt mechanism that changes the inclination of the seat surface of the seat cushion 2 in conjunction with the rotation of the seat back 5. This point will be described in detail later.

(Knuckle (angle adjustment part))
As shown in FIGS. 3 and 4, the knuckle 35 includes an internal gear 41 formed at the rear end rising portion 30 a of the seat cushion side frame, and an external gear 42 formed at the frame lower end portion 51 of the seat back. A Taumel mechanism is used. The external gear 42 has fewer teeth than the internal gear 41. This will be specifically described below.

    As shown in FIG. 4, an internal gear 41 and a bearing cylinder 43 on the inner side are formed concentrically at the rising portion 30 a on the seat cushion side, and the seat width is between the internal gear 41 and the bearing cylinder 43. Open outward in the direction. A rotation shaft 44 extending in the seat width direction is fitted to the bearing cylinder 43 of the left and right rising portions 30a of the seat and is rotatably supported.

    An annular external gear 42 is provided at the lower end 51 of the seat back frame so as to protrude toward the center in the seat width direction. The annular external gear 42 is inserted between the internal gear 41 of the rising portion 30a and the bearing cylinder 43 from the outside in the seat width direction. A cover 45 is fixed to the rotating shaft 44 outside the lower end 51 of the seat back frame, and the cover 45 covers the inside of the annular external gear 42. A support cylinder 46 is formed in the center of the cover 45, and the support cylinder 46 is fitted on the outer peripheral side of the bearing cylinder 43 so as to be rotatable from the outside in the seat width direction.

    As shown in FIG. 3, since the external gear 42 has a smaller number of teeth than the internal gear 41, it is eccentric with respect to the internal gear 41 by partially meshing with the internal gear 41. A space between the inner peripheral surface of the external gear 42 and the support tube 46 is referred to as an eccentric region. A pair of arc-shaped wedges 47 and 47 and an arc-shaped operating body 48 are inserted in the eccentric region. The wedges 47, 47 are urged away from each other by a spring 49, and due to the urging, the space between the inner peripheral surface of the external gear 42 and the support cylinder 46 in the eccentric region is narrowed. It is pushed in and is in a state of biting into the inner peripheral surface of the external gear 42 and the outer peripheral surface of the support cylinder 46. As a result, the external gear 42 has a large amount of eccentricity and is strongly pressed by the meshing portion with the internal gear 41, so that the external gear 42 is in a non-rotatable locked state. That is, the seat back 5 is held so as not to rotate with respect to the seat cushion 2.

    The operating body 48 is integrally provided on the outer peripheral surface side of the support tube 46 of the cover 45 and is disposed on the opposite side of the wedges 47 and 47 in the eccentric region, and both end surfaces are relative to the end surfaces of the wedges 47 and 47. is doing. When the rotating shaft 44 is rotated in one direction, the operating body 48 rotates in the same direction together with the rotating shaft 44 and hits one wedge 47, whereby the one wedge 47 rotates in the same direction and the above biting is released. (The above lock is released). Along with this, the external gear 42 rotates while changing the meshing position with the internal gear 41. By this rotation, the lock of the other wedge 47 is also released. The same applies when the rotation shaft 44 is rotated in the other direction.

    By rotating the rotating shaft 44 in this manner, the seat back 5 is unlocked with respect to the seat cushion 2 and is rotated forward or backward by the rotation of the external gear 42. At that time, since the external gear 42 on the seat back side is eccentric with respect to the axis of the rotating shaft 44 and revolves around the axis, the seat back 5 has no fixed center of swing, With the rotation, the position of the lower end of the seat back 5 varies (see FIG. 16).

(Operating force of the angle adjuster)
As shown in FIG. 4, one end of the rotating shaft 44 protrudes outward from the cover 45, and a rotating worm gear 61 is fixed to the protruding portion. As shown in FIG. 5, a worm 63 that is rotationally driven by an output shaft (operation force input unit) of the electric motor 62 is engaged with the rotating worm gear 61. Accordingly, an operating force is input to the knuckle 35 by the operation of the electric motor 62, whereby the rotating shaft 44 rotates and the seat back 5 rotates. The electric motor 62 is supported by the rear end rising portion 30a of the seat cushion side frame, and is operated by an occupant by an operation switch (not shown) provided in the seat 1 or in the room. The electric motor 62 may be installed on a vehicle body structure such as a vehicle body panel.

(Rotation reflection mechanism)
In order to mechanically interlock the seat cushion tilt mechanism with the rotation of the seat back 5 and change the tilt of the seat cushion 2, the driving portion that provides the driving force for operating the tilt mechanism, that is, the seat back 5 It is necessary to provide a prime mover that changes the posture reflecting the rotation. Therefore, in the present embodiment, as shown in FIG. 4, a cushion worm gear 64 constituting the rotation reflecting mechanism 60 is disposed adjacent to the rotation worm gear 61 and on the inner side in the seat width direction, and the rotation shaft 44. Is supported rotatably.

    As shown in FIG. 5, the cushion worm gear 64 has a fan-shaped tooth portion 65, and a driving portion 66 projects from the boss portion to the opposite side of the fan-shaped tooth portion 65. A tilt mechanism is connected to the prime mover 66 via a later-described interlocking mechanism. The cushion worm gear 64 is operated together with the knuckle 35 by the electric motor 62. For this purpose, the fan-shaped tooth portion 65 meshes with a worm 69 that is rotationally driven by the electric motor 62 via transmission gears 67 and 68. The support shaft of the worm 69 is rotatably supported by the rising portion 30a on the seat cushion side (not shown).

    In the case of the present embodiment, the cushion worm gear 64 and the transmission gears 67 and 68 constitute the rotation reflecting mechanism 60. The rotation reflecting mechanism 60 and the electric motor 62 are arranged on the outer side in the seat width direction than the seat back frame provided with the knuckle 35.

    When the electric motor 62 is operated to rotate the seat back 5, the seat back 5 is rotated by an angle corresponding to the operation amount of the electric motor 62. The same electric motor 62 rotates the cushion worm gear 64. Therefore, the rotational angle of the cushion worm gear 64, that is, the rotational position of the driving portion 66 reflects the rotation of the seat back 5.

    Further, as described above, the seat back 5 does not have a fixed swing center, and the position of the lower end portion of the seat back 5 varies with the rotation thereof, but the cushion worm gear 64 is rotated by the electric motor 62. Since it is only driven and rotates with a constant trajectory supported by the rotating shaft 44, the fluctuation of the lower end portion of the seat back 5 has no effect on the rotational position of the driving portion 66. The rotation position of the portion 66 reflects only the rotation angle of the seat back 5.

    As shown in FIG. 5, the seat back frame lower end 51 is joined to both lower ends of a frame body 50 formed by forming a pipe material in an inverted U shape along the peripheral shape of the seat back 5. It is formed by a molded plate.

(Tilt mechanism)
As shown in FIG. 6, a tilt mechanism 7 that tilts (swings) the seat cushion 2 adjacent to the inside (right side) of the left side frame 20 of the seat cushion 2, and this tilt is rotated by the seat back 5. An interlocking mechanism 8 for interlocking with the movement is provided integrally, and the seatback 5 is set at a predetermined angle from a reference standing position (a state where the seatback 5 is tilted backward by a predetermined angle of 5 to 20 ° with respect to the vertical) as shown in FIG. When rotating to a reclining position (see FIG. 7) tilted backward, the front portion of the seat cushion 2 is raised along with the subsequent tilting to increase the tilt toward the rear side of the seating surface. The predetermined angle can be set in advance as, for example, an inclination angle of the seat back 5 that is suitable for a passenger sitting on the seat 1 to take a nap.

    First, the tilt mechanism 7 will be described. As shown in FIG. 6, a downward projecting portion 20 a is formed at the front portion of the cushion side frame 20, and the projecting portion 20 a is interposed via a link 70 and a swing lever 71. The base side frame 30 is connected to the front portion so that the height can be adjusted. In addition, a downward projecting portion 20 b is formed at the rear end portion of the cushion side frame 20, and the projecting portion 20 b rotates around a support pin (a horizontal axis) 37 attached to the base side frame 30. Supported as possible.

    Thus, the cushion side frame 20 rotates around the support pin 37 that supports the lower projecting portion 20b on the rear side, so that the front portion of the seat cushion 2 swings up and down (tilt). Even if the front part of the seat cushion 2 swings, the rear end thereof hardly moves (in this example, it moves slightly back and forth due to the swing of the downward projecting part 20b), and the front part of the seat cushion 2 also moves up and down. The amount of movement before and after the amount of movement is small.

    More specifically, the lower projecting portion 20 a on the front side of the cushion side frame 20 is rotatably connected to the upper end portion of the link 70 via a pin 72, and the lower end portion of the link 70 is rocked via a pin 73. The movable lever 71 is pivotally connected to one end of the movable lever 71. This rocking lever 71 is a “<”-shaped flat plate member, and a rocking shaft 74 is fixed in a bent state at a bent portion. As shown in FIG. 2, the swing shaft 74 extends in the left-right direction, and both end portions thereof are rotatably supported by the base side frames 30 and 30, respectively.

    One side of the rocking lever 71 extends substantially forward from the rocking shaft 74 and rocks up and down. A link 70 connected to the end of the rocking lever 71 is located forward of the rocking shaft 74. The point of action of the force from the swing lever 71 to the cushion side frame 20 is positioned forward. This means that the point of application of the force to the front portion of the seat cushion 2 is far from the rear shaft support portion (support pin 37), and thereby the seat cushion can be operated with a relatively small force. The front part of 2 can be moved up and down.

    As described above, one side (hereinafter also referred to as an output side) of the swing lever 71 that operates the cushion side frame 20 via the link 70 is separated from the swing shaft 74 when the seat back 5 is in the reference standing position. It extends diagonally forward and downward. Therefore, the front part of the cushion side frame 20 connected to the end part on the output side via the link 70 is positioned relatively downward, and at this time, the seating surface of the seat cushion 2 is the seating posture of the occupant It is in the appropriate inclination state set beforehand corresponding to. Hereinafter, it is said that the seat cushion 2 is at the reference position at this time.

    Further, in this embodiment, a coil spring 75 is disposed between the cushion side frame 20 and the base side frame 30 behind the link 70 and the swing lever 71 so as to extend vertically, The front part of the cushion side frame 20 is always urged downward. This urging force acts downward on the output side of the swing lever 71 via the link 70, and always urges the swing lever 71 to rotate counterclockwise in FIG.

    On the other hand, although not shown, a stopper portion is provided on the inner side of the base side frame 30 so as to engage with the cushion side frame 20 when the seat cushion 2 is at the reference position and to prevent downward movement thereof. ing. For this reason, even if it is urged downward by the tensile force of the coil spring 75 as described above, the front part of the cushion side frame 20 cannot move below the position corresponding to the reference position of the seat cushion 2. . That is, the front portion of the seat cushion 2 is at the lowest position at the reference position.

    As described above, the other side of the swing lever 71 having a “<” shape extends substantially upward from the swing shaft 74 in this embodiment. The front end portion of the second interlocking link 81 of the interlocking mechanism 8 is rotatably connected, and the rotational displacement of the driving part 66 of the rotational reflecting mechanism 60 is transmitted via the interlocking mechanism 8. (Hereinafter, the other side of the swing lever 71 is also referred to as an input side). As will be described in detail later, when the seat back 5 tilts backward from the reference standing position to the reclining position, the input lever is pulled backward via the second interlocking link 81, so that the swing lever 71 is a coil spring. It rotates in the clockwise direction in the figure against the rotational biasing force of 75.

    When the swing lever 71 rotates in this manner, the output side thereof moves upward and pushes up the front portion of the cushion side frame 20 via the link 70. FIG. 7 shows a state in which the seat back 5 is tilted rearward to the reclining position. At this time, the front portion of the seat cushion 2 is at the highest position (uppermost position), and its seating surface tilts relatively rearward. Thus, it is possible to appropriately hold the buttocks of the occupant whose upper body is entrusted to the seatback 5 tilted backward, and to prevent the forward displacement thereof. The position of the seat cushion 2 at this time is hereinafter referred to as a tilt position.

    As described above, in the tilt mechanism 7 of this embodiment, the movement of the second interlocking link 81 in the front-rear direction accompanying the rotation of the seat back 5 is efficiently moved up and down by the “<”-shaped swing lever 71. In other words, the front part of the seat cushion 2 is moved up and down by converting into movement in the direction, and the amount of vertical movement of the front part of the seat cushion 2 can be sufficiently increased with a compact configuration.

    Further, the end of the swing lever 71 on the input side is positioned above the swing shaft 74 and is pulled rearward by the second interlocking link 81 as the seat back 5 rotates backward. As a result, the input side of the swing lever 71 is displaced rearward, that is, away from the swing shaft 74, so that it is easy to prevent the interference between them, and this also constitutes the tilt mechanism 7 compactly. This is preferable.

(Interlocking mechanism)
Next, the interlocking mechanism 8 will be described. The interlocking mechanism 8 of this embodiment includes first and second interlocking links 80 and 81 that connect the driving part 66 of the rotation reflecting mechanism 60 to the swing lever 71 of the tilt mechanism 7. One end portion (end portion on the seat back side) of the first interlocking link 80 is rotatably connected to the driving portion 66 via a pin 82, while the other end portion (tilt mechanism) of the first interlocking link 80 is provided. Side end) is rotatably connected to a rear end portion of the second interlocking link 81 via a pin 83. The front end portion of the second interlocking link 81 is rotatably connected to the input side end portion of the swing lever 71 of the tilt mechanism 7 via the pin 76 as described above.

-Long hole of the first interlocking link-
In this embodiment, the first interlocking link 80 is formed with a long hole 80a that is long in the longitudinal direction, and the long hole 80a can rotate with the support pin 38 attached to the base side frame 30 and slide. Engagement possible. For this reason, the first interlocking link 80 has an end portion (pin 82) between the elongated hole 80 a and the support pin 38 when the seatback 5 rotates around the rotation support shaft 52. The operation is restricted so that the engaged state is maintained, and as a result, the first interlocking link 80 is either rotated around the support pin 38 or slid along the support pin 38. The operation mode is switched so as to become the subject.

    For example, when the seat back 5 rotates between the reference standing position (FIG. 6) and the reclining position (FIG. 7), the moving direction of the one end portion (pin 82) of the first interlocking link 80 (in FIG. 6, the arrow a1). 1) is significantly different from the direction in which the elongated hole 80a extends, the first interlocking link 80 mainly operates to rotate around the support pin 38, and is connected to the other end. The rear end portion of the interlocking link 81 moves substantially in the front-rear direction as indicated by an arrow a2 in FIG. As a result, the entire second interlocking link 81 moves in the front-rear direction.

    On the other hand, when the seat back 5 is further tilted backward beyond the reclining position in FIG. 7, the movement direction of one end (pin 82) of the first interlocking link 80 is the long hole 80a as shown by an arrow a3 in FIG. Therefore, the first interlocking link 80 moves in the vertical direction by sliding the elongated hole 80a with respect to the support pin 38. As shown in FIG. 8, the support pin 38 is positioned at the lowermost end of the long hole 80 a of the first interlocking link 80 in the full flat position where the seat back 5 is substantially laid down.

    Then, when the seat back 5 rotates between the reclining position (FIG. 7) and the full flat position (FIG. 8), the other end portion (pin 83) of the first interlocking link 80 is shown by an arrow in FIG. As shown by a4, the second interlocking link 81 connected to the rear end portion of the second interlocking link 81 is rotated around the pin 76 at the front end portion, but is almost in the front and rear direction. Do not move.

    In other words, when the seat back 5 is tilted backward from the reference standing position, the first interlocking link 80 operates as a pivoting body as the seat back 5 tilts backward until the reclining position, whereby the second interlocking link is operated. The tilt mechanism 7 is operated via 81, and the inclination of the seat surface of the seat cushion 2 changes. On the other hand, when the seat back 5 is tilted backward beyond the reclining position, the first interlocking link 80 mainly operates by sliding up and down, and the tilt mechanism 7 does not operate, so that the seat cushion 2 is in the tilt position. Maintained.

-Long hole of the second interlocking link-
In this embodiment, a long hole 81a is also formed in the front end portion of the second interlocking link 81 connected to the output side of the swing lever 71 as described above, and a connecting pin 76 rotates in the long hole 81a. It is inserted so as to be slidable. As shown in FIG. 6 and the like, the long hole 81a extends long in the front-rear direction, so that the front end portion of the second interlocking link 81 can turn to the input-side end portion of the swing lever 71 and is substantially in the front-rear direction. It is slidably connected to.

    Due to the presence of the long hole 81a, even if the second interlocking link 81 moves back and forth as the seat back 5 rotates as described above, it is not transmitted to the swing lever 71 and the tilt mechanism 7 operates. There are things that do not. That is, when the seat back 5 is in the reference standing position, as shown in FIG. 6, the pin 76 is located at the front end of the long hole 81a of the second interlocking link 81, from which the second interlocking link 81 moves forward. Even if it moves, the pin 76 only slides relatively rearward in the long hole 81a formed therein, and the pin 76 is not pushed forward from the second interlocking link 81.

    Further, when the seat cushion 2 is in the reference position, the seat cushion 2 is prevented from moving downward by the stopper portion via the cushion side frame 20, and thus the swing lever 71 is in a state opposite to that shown in FIG. Clockwise rotation is prevented. Therefore, when the seatback 5 rotates between the reference standing position (FIG. 6) and the position tilted forward (FIG. 9), the first interlocking link 80 rotates accordingly, and the second interlocking is performed. Even if the link 81 moves back and forth, the operation is not transmitted to the swing lever 71, and the seat cushion 2 remains maintained at the reference position.

  On the other hand, when the seat back 5 is between the reference standing position (FIG. 6) and the reclining position (FIG. 7), the seat cushion 2 is also between the reference position and the tilt position. The tensile force of the acting coil spring 75 acts on the swing lever 71 via the link 70, and this is urged to rotate counterclockwise in FIG. For this reason, when the seat back 5 returns from the reclining position to the reference standing position, the pin 76 moves forward so as not to leave the front end of the elongated hole 81a as the second interlocking link 81 moves forward. Accordingly, the swing lever 71 rotates.

    On the other hand, when the seat back 5 tilts rearward toward the reclining position, the second interlocking link 81 moves rearward while pulling the pin 76 engaged with the elongated hole 81a at the front end portion thereof, and thus the swinging movement is performed. The moving lever 71 turns clockwise in FIG. 6 or the like against the turning biasing force caused by the tensile force of the coil spring 75.

    In other words, in this embodiment, when the seat back 5 is tilted forward from the reference standing position, the second displacement link 81 is connected to the connecting portion on the tilt mechanism 7 side so that the rotational displacement is not transmitted to the tilt mechanism 7. The long hole 81a is provided, and when the seat back 5 returns to the reference standing position from the reclining position, the rotational displacement is difficult to be transmitted. It is configured such that it always returns downward to the reference position by being urged downward by a tensile force of 75. As a result, the rotational displacement of the seat back 5 returning from the reclining position is transmitted to the tilt mechanism 7. Will be.

(Sheet operation)
Next, the operation of the seat 1 according to this embodiment will be described. First, when the seat back 5 is tilted backward from the reference standing position shown in FIG. 6, the rotating shaft 44 is rotated by the rotating worm gear 61 by operating the electric motor 62 by a switch operation. Due to the rotation of the rotating shaft 44, the operating body 48 rotates around the bearing cylinder 43 and the wedges 47, 47 are removed. Thereby, the external gear 42 on the seat back side rotates to change the meshing position with the internal gear 41 on the seat cushion side. That is, the seat back 5 rotates backward.

    Since the external gear 42 on the seat back side is eccentric with respect to the internal gear 41 on the seat cushion side, the lower end portion of the seat back varies as the seat back 5 rotates. That is, the axis of the external gear 42 circulates around the axis of the rotary shaft 44. For this reason, a component in the front-rear direction also appears in the fluctuation of the lower end of the seatback, and the reciprocating motion is also made in the front-rear direction.

    However, the driving force for tilting the seat cushion 2 is not taken from the seat back itself, and the driving portion of the worm gear 64 for cushions that supports the output of the electric motor 62 for rotating the seat back 5 on the rotating shaft 44. 66, the movement of the driving section 66 is used as a driving force. Therefore, the movement of the driving portion 66 is not affected by the change in the lower end portion of the seat back.

    Therefore, as the driving portion 66 rotates about the rotation shaft 44 in the clockwise direction in the drawing, the first interlocking link 80 smoothly counterclockwise without being slightly swung back and forth around the support pin 38. Rotate around. Accordingly, the second interlocking link 81 moves rearward and pulls the input side of the swing lever 71 rearward. As a result, the swing lever 71 is rotated clockwise as shown in FIG. 6 and the like, and the front portion of the cushion side frame 20 is pushed up via the link 70, thereby resisting the tensile force of the coil spring 75. The front rises. Thus, when the front part of the seat cushion 2 rises, the rise does not stop or reverse, preventing the passenger from feeling uncomfortable or uncomfortable.

    In this way, the front part of the seat cushion 2 rises as the seat back 5 tilts backward, and the rear tilt of the seat surface gradually increases, so that the butt of the occupant is appropriately adjusted according to the degree of rear tilt of the seat back 5 Will be able to hold. Then, as shown in FIG. 7, when the seat back 5 is in the reclining position and the occupant tilts the upper body in the seat back 5 so that it is easy to take a nap, the seat cushion 2 is compared at the tilt position. It will be in the state where it inclined tightly, and it can prevent front shift of a crew member's buttocks.

    Thus, even when the front portion of the seat cushion 2 is raised to the uppermost position so that the seat surface is inclined relatively tightly, the rear end of the seat cushion 2 is hardly moved (in this example, Rather, since there is no large gap between the lower end of the reclining seat back 5 as described above, the occupant's bottom is sandwiched in such a gap, and the comfortability is impaired. There is no fear.

    When the seat back 5 further tilts backward, the first interlocking link 80 now slides in the elongated hole 80a with respect to the support pin 38 and moves generally upward, whereby the second interlocking link 81 is moved. It rotates around its front end (pin 76) counterclockwise (upward) in the figure, and hardly moves back and forth. Thus, the swing lever 71 does not swing until the seat back 5 reaches the full flat position (FIG. 8), and the seat cushion 2 is maintained in the tilt position.

    Thus, when the seat back 5 tilts backward beyond the reclining position, the rotational displacement is not transmitted to the tilt mechanism 7 and the seat cushion 2 is maintained at the tilt position. The tilt of the seat surface does not become too tight even if the vehicle is tilted backward, so that the occupant's comfortability does not deteriorate and the operation of the reclining lever and the like does not become difficult.

    When the seatback 5 tilted backward beyond the reclining position returns to the reference standing position as described above, even if the seatback 5 is rotated to the reclining position in the same manner as described above, the second interlocking link 81 is moved to its front end. The swing lever 71 does not swing only by rotating around the portion (pin 76). On the other hand, from the reclining position to the reference standing position, when the first interlocking link 80 rotates around the support pin 38 clockwise as the seat back 5 rotates, the second interlocking link 81 is thereby rotated. Is moved forward, and the swing lever 71 is rotated counterclockwise in the figure by the rotation biasing force generated by the tensile force of the coil spring 75.

    Therefore, as the seat back 5 gradually rises from the reclining position toward the reference standing position, the front portion of the seat cushion 2 is gradually moved downward by the tensile force of the coil spring 75, and the inclination of the seat surface gradually increases. To become loose. As a result, the seat surface of the seat cushion 2 is in an appropriate inclined state corresponding to the degree of rearward inclination of the seatback 5 as in the case of the rearward inclination.

    When the seat back 5 that has returned to the reference standing position further rotates forward, the first interlocking link 80 moves around the support pin 38 along with the rotation as in the case of returning from the reclining position as described above. As a result, the second interlocking link 81 moves forward. At this time, the seat cushion 2 is already in the reference position, and the front portion thereof cannot move any further downward. Does not rotate, and the input side pin 76 slides relatively rearward along the elongated hole 81a at the front end of the second interlocking link 81.

    That is, the rotational displacement of the seat back 5 is absorbed by the elongated hole 81 a of the second interlocking link 81 in the interlocking mechanism 8 and is not transmitted to the tilt mechanism 7. On the contrary, when the seat back 5 is rotated from the forward tilt position to the reference standing position, the rotational displacement is absorbed by the elongated hole 81a of the second interlocking link 81 in the same manner as described above, to the tilt mechanism 7. Is not transmitted.

<Embodiment 2>
This embodiment is shown in FIGS. A rotating body 64A that rotates integrally with the cushion worm gear 64 is rotatably supported on the rotating shaft 44, and a driving portion 66 that protrudes downward is provided on the rotating body 64A. Further, the interlocking mechanism 8 is constituted by one interlocking link 85. The configuration of the tilt mechanism 7 is also changed. Other configurations are substantially the same as those of the first embodiment. Hereinafter, the same members are denoted by the same reference numerals, and description thereof is omitted.

    Referring to FIG. 10, in this example, the swing lever 77 of the tilt mechanism 7 is not shaped like “<” as in the above embodiment, and the swing shaft 74 is fixed to one end (the upper end in the figure) and the other end (The lower end in the figure) is constituted by a link serving as both an input side and an output side. Further, the link 70 connected to the swing lever 77 by the pin 73 has a longer axial length than that of the above embodiment. Furthermore, the front end portion of the interlocking link 85 is connected to the pin 73 that connects the two through a slot 85a so as to be rotatable and slidable.

    The interlocking link 85 is shaped like a letter “h” that is long in the front-rear direction so that the first and second interlocking links 80, 81 in the above embodiment are integrated, and the bent portion on the rear end side is the base side frame 30. A side of the upper projecting portion 30a extends upward, and a driving portion 66 on the seat back 5 side is rotatably connected to an upper end portion thereof via a pin 86. A slot 66a is formed in the driving portion 66, and a pin 86 attached to the rear end portion of the interlocking link 85 is rotatably and slidably engaged with the slot 66a. .

    When the seat back 5 tilts backward (reclining) from the reference standing position shown in FIG. 10 to the reclining position shown in FIG. 11, the connecting portion (pin 86) with the driving portion 66 moves along with the rotation of the seat back 5. By rotating around the rotating shaft 44 in the clockwise direction in the figure, the interlocking link 85 moves forward, so that the lower end portion of the swing lever 77 rotates around the swing shaft 74 in the clockwise direction in the figure. At the same time, the front portion of the cushion side frame 20 is pushed up via the link 70, and the seat cushion 2 is positioned at the tilt position where the front portion is the uppermost position.

    Next, when the seat back 5 further tilts beyond the reclining position (FIG. 11), the pin 86 at the rear end portion of the interlocking link 85 slides along the elongated hole 66a of the driving portion 66, and the seat back 5, even if the driving portion 66 rotates around the rotation shaft 44, the interlocking link 85 only rotates around the front end portion (pin 73). The link 70 is not operated. Therefore, the seat cushion 2 is maintained in the tilt position until the seat back 5 reaches the full flat position shown in FIG.

    On the other hand, when the seat back 5 tilts forward from the reference standing position (FIG. 10), the driving portion 66 rotates about the rotation shaft 44 counterclockwise as the rotation thereof, and the connecting portion with this. As the (pin 86) moves rearward and obliquely upward, the interlocking link 85 moves backward including its front end. However, in the long hole 85a at the front end portion of the interlocking link 85 that moves backward in this manner, the pin 73 slides relatively to the front side, and the pin 73 is not pulled to the rear side. Therefore, the swing lever 77 and the link 70 do not operate. For this reason, the seat cushion 2 is maintained at the reference position as shown in FIG.

    Thus, when the seat back 5 is further rotated forward from a state inclined forward by a predetermined angle and the driving portion 66 further rotates around the rotation shaft 44, the rear end portion of the interlocking link 85 is moved by the pin 86. Further, the pin 73 is already lifted obliquely upward, but since the pin 73 is already positioned at the front end in the elongated hole 85a at the front end, the pin 73 is also moved obliquely upward and rearward. The swing lever 77 is lifted obliquely upward rearward, whereby the swing lever 77 rotates around the swing shaft 74 counterclockwise in the figure.

    By the rotation of the swing lever 77, the front portion of the cushion side frame 20 is pulled down via the link 70, and the seat surface of the seat cushion 2 sinks as shown in FIG. Therefore, the seat back 5 can be largely inclined forward until the back surface thereof becomes a substantially horizontal forward lying position without causing interference with the seat cushion 2.

    In this example, as described above, the interlocking link 85 is connected to the driving portion 66 on the seat back 5 side and the swinging lever 77 on the tilt mechanism 7 side through the long holes 66a and 85a, respectively. Then, while the seat back 5 is rotated 90 ° or more (first set angle) from the reference standing position (FIG. 10) to the front prone position (FIG. 14), the seat cushion 2 is moved by the tilt mechanism 7. Only about 15 ° (second set angle) rotates. That is, since the downward tilt angle is smaller than the reference position of the seat cushion 2, it is not necessary to dispose the tilt angle greatly away from the vehicle body floor, and it can be said that the degree of freedom in layout is high.

    Further, as can be seen from FIGS. 11, 12, etc., since the interlocking link 85 has a “he” shape, the interlocking link 85 does not protrude upward even when the seat back 5 is largely inclined backward. The interference with the cushion body of the seat cushion 2 can be easily avoided.

    Thus, also in the case of the present embodiment, the rotation of the driving portion 66 accompanying the rotation of the seat back 5 is not affected by the fluctuation of the lower end portion of the seat back, so that the seat cushion 2 is smoothly smooth without being jerky. Tilt.

<Embodiment 3>
In this embodiment, the present invention is applied to an ottoman rotation mechanism and is shown in FIG. The driving portion 66 for the ottoman turning mechanism 90 is projected outward in the radial direction from the rotating body 64A that rotates integrally with the cushion worm gear 64 and rotates around the rotating shaft 44, as in the second embodiment. is there. The ottoman 91 is provided with a footrest cushion 93 on one side of a substrate 92. The ottoman rotation mechanism 90 is configured such that one end of the substrate 92 of the ottoman 91 is rotatably connected to the front end of the base side frame 30 of the seat cushion 2 by a support pin 94 in the seat width direction.

    The interlocking mechanism 8 is configured by one link 87. That is, the link 87 extends in the front-rear direction, its front end is connected to the base plate 92 of the ottoman 91 by the connecting pin 88 in the seat width direction, and its rear end is connected to the driving portion 66 by the connecting pin 89 in the seat width direction. . The connecting pin 88 at the front end is provided movably in a long hole (a long hole extending from the base end side to the front end side) 92 a formed in the substrate 92. Further, the link 87 is provided with a long hole 87a in the link longitudinal direction at an intermediate portion thereof, and the long hole 87a is engaged with a regulation pin 30A provided in the base side frame 30 in the seat width direction so as to be relatively movable. .

    Accordingly, when the seat back 5 is rotated backward, the link 87 moves forward due to the accompanying rotation of the driving portion 66, and accordingly, the ottoman 91 rotates forward from the state where it hangs down at the front end of the seat cushion 2. Then rise. Also in the present embodiment, the rotation of the driving portion 66 accompanying the rotation of the seat back 5 is not affected by the fluctuation of the lower end portion of the seat back, and therefore the ottoman 91 rotates and rises smoothly without being jerky.

<Other embodiments>
As described above, the rotating shaft 44 rotates at a fixed position in response to the operation force of the electric motor 62. Therefore, even if the driving portion 66 is provided to rotate integrally with the rotating shaft 44, the rotation of the seat back 5 can be performed. The seat cushion 2 can be tilted or the ottoman can be raised by reflecting only the rotation angle of the seat back 5 on the driving portion 66 without being affected by the fluctuation of the lower end of the seat back accompanying the movement. In this case, the rotating shaft 44 and the driving unit 66 constitute a rotation reflecting mechanism.

    In the case of adopting the Taumel mechanism for the angle adjustment unit, in the above embodiment, the internal gear 41 is provided on the seat cushion side and the external gear 42 is provided on the seat back side, but conversely the internal gear 41 is provided on the seat back side. The external gear 42 may be provided on the seat cushion side.

1 is a perspective view illustrating an appearance of an automobile seat according to Embodiment 1. FIG. It is a perspective view which omits the cushion body of the same form and shows the frame structure of a seat cushion. It is sectional drawing which shows the structure of the knuckle of the same form. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the expanded side view which shows the operation force input part of the same form, a rotation reflection mechanism, etc. It is a side view which shows the relationship of each mechanism of the sheet | seat apparatus of the form. FIG. 7 is a view corresponding to FIG. 6 at the time of reclining. FIG. 7 is a view corresponding to FIG. 6 when fully flat. FIG. 7 is a view corresponding to FIG. 6 when the seat back is tilted forward. FIG. 7 is a view corresponding to FIG. 6 according to the second embodiment. FIG. 8 is a view corresponding to FIG. FIG. 9 is a view corresponding to FIG. FIG. 10 is a view corresponding to FIG. FIG. 11 is a view corresponding to FIG. 10 when the seat back is retracted. FIG. 7 is a view corresponding to FIG. 6 according to the third embodiment. It is explanatory drawing of the subject of this invention.

Explanation of symbols

1 sheet (sheet device)
2 Seat cushion 5 Seat back 7 Tilt mechanism (cushion operating mechanism)
8 interlocking mechanism 35 knuckle (angle adjustment part)
41 Internal gear 42 External gear 44 Rotating shaft 60 Rotation reflecting mechanism 62 Electric motor (operation force input unit)
66 prime mover 90 ottoman turning mechanism (cushion actuating mechanism)
91 Ottoman (footrest)

Claims (7)

An angle adjuster for rotating and holding the seat back from the reference standing position to at least one of the front and rear, and
A cushion actuation mechanism for moving a predetermined part of the seat cushion up and down or back and forth;
A prime mover that moves with the rotation of the seat back and provides a motive force to activate the cushion actuation mechanism;
In a seat device including an interlocking mechanism that transmits the movement of the driving portion to the cushion operating mechanism and interlocks a predetermined portion of the seat cushion with the rotation of the seat back.
The angle adjustment unit does not form a swing center determined by the rotation of the seat back, and causes the lower end of the seat back to fluctuate with the rotation.
In accordance with the rotation of the seat back, there is provided a rotation reflecting mechanism that suppresses the influence due to the fluctuation of the lower end of the seat back and moves the driving portion so that the change in the rotation angle of the seat back is reflected. A sheet apparatus characterized by comprising: In claim 1,
An operation force input unit for rotating the seat back;
The seat device according to claim 1, wherein the angle adjustment unit rotates the seat back when an operation force is input from the operation force input unit. In claim 2,
The rotation reflection mechanism receives an operation force from the operation force input unit and operates with the angle adjustment unit. In claim 3,
The seating device according to claim 1, wherein the interlocking mechanism includes a link that swings in a seat front-rear direction for operating the cushion operating mechanism, and the driving unit is coupled to the link. In claim 4,
The driving part is provided so as to be rotationally displaced about a predetermined axis in accordance with the rotation of the seat back.
The link of the interlocking mechanism is formed with a long hole for preventing the rotational displacement of the driving portion from being transmitted to the cushion operating mechanism when the seat back is within a predetermined rotational angle range. The sheet apparatus characterized by the above-mentioned. In claim 3,
The seat device according to claim 1, wherein the rotation reflecting mechanism and the operation force input unit are arranged on an outer side in a seat width direction than a seat back frame connected to the angle adjusting unit. In claim 1,
The angle adjusting unit includes an internal gear provided on one of the seat cushion and the seat back, and an external gear that meshes with the internal gear provided on the other and rolls on the inner peripheral side of the internal gear. A seat device using a Taumel mechanism provided with a toothed gear.

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