JP5297954B2 - Reclining device for vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device for a vehicular seat capable of stabilizing the actuation of a seat back while making the seat back thin. <P>SOLUTION: A tilting bracket 16 is provided, which is equipped with a first rotation shaft 17 journaled to a seat cushion 14a, and a second rotation shaft 18 journaled to a seat back 14b. On the seat back 14b, a back side stopper 24 projecting toward the tilting bracket 16 side is provided. The tilting bracket 16 is provided with a front regulating portion 22a abutting on a front surface of the back side stopper 24, and a rear regulating portion 22b abutting on a rear surface of the back side stopper 24. The front regulating portion 22a is set at a front side position by a first setting angle &theta;1 from a line q connecting the first rotation shaft 17 and the second rotation shaft 18, and the rear regulating portion 22b is set at a rear side position by a second setting angle &theta;2 larger than the first setting angle &theta;1 from the line q. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a reclining device for a vehicle seat.

As a rear seat of a vehicle, there is known a seat that allows a passenger walking space to be secured between left and right seats as necessary by allowing the center seat to be flipped up to the side (for example, Patent Documents). 1).
In the rear seat described in Patent Document 1, the seat back of the center seat is connected to the rear end portion of the seat cushion via a hinge so as to be tiltable, while the seat cushion of the center seat is connected to one of the left and right adjacent seats. On the other hand, it is connected via a link mechanism so that it can be flipped up.

JP 2007-91077 A

  By the way, in this type of seat, it is desirable to reduce the thickness of the seat back from the viewpoint of securing the passage space when flipping up, but considering the reclining of the seat back integrally with the adjacent seat during normal use, to some extent As described above, it is difficult to reduce the thickness of the seat back. In other words, if the thickness of the seat back of the center seat is made thinner than a certain level while keeping the reclining axis of the seat adjacent to the center seat coaxial, between the seat back of the center seat and the seat back of the seat adjacent to the center seat It becomes easy to make a step.

  For this reason, a tilt bracket having a first rotating shaft pivotally supported by the seat cushion and a second rotating shaft pivotally supported by the seat back is used, and the seat back is tilted in two stages via the tilt bracket. The reclining device to be made is researched. In this reclining device, when the seat back is normally used (deployed), the tilt bracket is erected so as to be inclined forward with respect to the seat cushion, and in this state, the seat back is rotated by the second rotation of the tilt bracket. Tilt to the rear upper side around the axis.

  However, when such a tilt bracket is adopted, the rotation direction of the seat back on the second rotation shaft is difficult to be determined, and there is a concern that the behavior of the seat back becomes unstable during the operation of causing the seat back. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat reclining device capable of stabilizing the operation of the seat back while reducing the thickness of the seat back.

The invention according to claim 1, which solves the above problem, includes a first rotation shaft (for example, a first rotation shaft in a later-described embodiment) supported by a seat cushion (for example, a seat cushion 14a in a later-described embodiment). A tilt bracket including a rotation shaft 17) and a second rotation shaft (for example, a second rotation shaft 18 in an embodiment described later) pivotally supported by a seat back (for example, a seat back 14b in an embodiment described later). (E.g., a tilt bracket 16 in an embodiment described later), a vehicle seat reclining device in which the seat back is tiltably coupled to the seat cushion via the tilt bracket, A back side stopper that protrudes toward the tilt bracket side (for example, a back side stopper 24 in an embodiment described later). The tilt bracket is provided with a front restriction portion (for example, a restriction portion 22a in an embodiment described later) that contacts the front surface of the back side stopper, and a rear side restriction portion (for example, a back surface stopper that contacts the rear surface of the back side stopper). In the embodiment described later, a restricting portion 22b) is provided, and the front restricting portion has a first set angle about the second rotating shaft from a line connecting the first rotating shaft and the second rotating shaft. (For example, a first set angle θ1 in an embodiment described later) is set to the front position, and the rear regulating portion is larger than the first set angle from the line around the second rotation axis. A rear set position is set by a second set angle (for example, a second set angle θ2 in an embodiment described later), and the tilt bracket is biased in the direction of lowering the front lower portion around the first rotation axis. Energizing spr Grayed (e.g., bias spring 30 in the embodiment), characterized in that is provided.
Accordingly, when the seat back is raised rearward from the state where the seat back is tilted forward to the seat cushion side, the back side stopper comes into contact with one of the front side restricting portion and the rear side restricting portion, and the tilt bracket is moved to the first position. The rear side is rotated about the rotation axis, but when the back side stopper comes into contact with the rear side restricting portion, the bending angle of the seat back and the tilting bracket becomes larger. At this time, since the tilting bracket is urged downward by the urging spring about the first rotation axis, the seat back rotates preferentially about the second rotation axis. . For this reason, it is easy to stably operate the seat back in a state where the back side stopper is in contact with the rear side restricting portion.

According to a second aspect of the present invention, in the vehicle seat reclining device according to the first aspect, a notch portion (for example, in an embodiment described later) that forms the front restriction portion and the rear restriction portion in the tilt bracket. A notch portion 22) is provided, and the back side stopper is disposed so as to protrude inside the notch portion.
Thereby, a front side regulation part and a rear side regulation part come to be integrally formed on a tilt bracket.

  According to the first aspect of the present invention, when the seat back is raised, the back side stopper stably comes into contact with the rear side restricting portion that can increase the bending angle of the seat back and the tilt bracket. A stable raising operation of the seat back can be obtained while reducing the thickness of the seat back.

  According to the second aspect of the present invention, since the front side restricting portion and the rear side restricting portion are integrally formed by the notch portion provided in the tilting bracket, the manufacturing cost is reduced by simplifying the structure and facilitating the manufacturing. be able to.

1 is a side view of a vehicle according to an embodiment of the present invention. It is the perspective view which looked at the 2nd row seat of vehicles of one embodiment of this invention from the front part slanting upper part. It is the perspective view which looked at the 2nd row seat of vehicles of one embodiment of this invention from the rear part slanting upper part. It is a side view which shows the frame | skeleton part of the 2nd row center sheet | seat of one Embodiment of this invention. It is the side view to which a part of frame part of the 2nd line center sheet of one embodiment of this invention was expanded. It is the side view to which a part of frame part of the 2nd line center sheet of one embodiment of this invention was expanded. It is the side view to which a part of frame part of the 2nd line center sheet of one embodiment of this invention was expanded. It is a side view for demonstrating the action | operation of the 2nd row center sheet | seat of one Embodiment of this invention. It is a side view for demonstrating the action | operation of the 2nd row center sheet | seat of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a side surface of a vehicle 1 in which the reclining device of this embodiment is adopted. This vehicle 1 is a minivan type vehicle having seats 2A, 2B, and 2C in three front and rear rows, and the reclining device of this embodiment is employed in the second row seat 2B.

2 and 3 show the second-row seat 2B portion in the passenger compartment.
As shown in the figure, in the second row seat 2B, the right seat 10 and the left seat 11 are installed on the vehicle body floor 12 via the guide rails 13 so as to be slidable in the front-rear direction. A center sheet 14, which is narrower than the right sheet 10 and the left sheet 11, is connected to the side part so as to be able to flip up and rotate. The center seat 14 is unfolded so as to fill a gap between the right seat 10 and the left seat 11 and is flipped up to the right seat 10 side in a folded state. Form a walking space where occupants can move. In FIG. 2, only the center seat 14 is shown with the internal structure such as the frame portion exposed.

  The right seat 10 and the left seat 11 are connected to the rear ends of the seat cushions 10a and 11a via a hinge (not shown) so as to be tiltable, and the seat backs 10b and 11b are operated by a lever operation of a reclining mechanism (not shown). The inclination angle can be adjusted.

The center seat 14 is connected to the frame portion of the seat cushion 10a of the right seat 10 via a link mechanism (not shown) so that the seat cushion 14a can be flipped up and rotated. In FIG. 2, reference numeral 15 denotes a cover that covers a link mechanism that connects the right seat 10 and the center seat 14. In addition, the seat back 14b of the center seat 14 is connected to the rear end of the seat cushion 14a on both the left and right sides via a pair of tilt brackets 16 described later.
The seat cushion 14a and the seat back 14b of the center seat 14 are compared with the seat backs 10b and 11b of the left and right seats 10 and 11 so that a wider walking space can be secured between the left and right seats 10 and 11 in the raised state. Thinly formed.

4 to 7 show a connecting portion of the seat cushion 14a of the center seat 14 and the frame portion of the seat back 14b.
As shown in these drawings, the tilt bracket 16 is made of an oval plate material, and one end in the longitudinal direction is rotatably connected to the rear end portion of the frame portion of the seat cushion 14a. The other end in the direction is rotatably connected to the lower end of the frame portion of the seat back 14b. A portion where one end of the tilt bracket 16 is rotatably connected to the seat cushion 14a is referred to as a first rotating shaft 17, and a portion where the other end of the tilt bracket 16 is rotatably connected to the seat back 14b is second. The rotation axis 18 is referred to as

The first rotation shaft 17 of the tilt bracket 16 is set to be coaxial with the hinge center P (reclining shaft) of the right seat 10 when the seat cushion 14a of the center seat 14 is in the deployed state. Further, when the center seat 14 is used (deployed), the tilt bracket 16 is fixed in a state where the tilt bracket 16 stands obliquely forward about the first rotation shaft 17. For this reason, the upper end side of the tilt bracket 16 protrudes forward, and the lower end of the seat back 14b is supported by the second rotating shaft 18 at the protruding position. Accordingly, the seat back 14b of the center seat 14 is thinner than the seat backs 10b and 11b of the left and right seats 10 and 11, but the front surface thereof is substantially the same as that of the seat backs 10b and 11b of the left and right seats 10 and 11. It will be the same.
A biasing spring 30 is provided between the tilt bracket 16 and the seat cushion 14a to bias the tilt bracket 16 about the first rotation shaft 17 in a direction to tilt the front bracket downward.

As shown in FIGS. 2 and 3, a lock mechanism 19 for integrally connecting the raised seat back 14b to the seat back 10b of the right seat 10 is provided at the middle position of the right frame portion of the seat back 14b. Is provided. In the figure, reference numeral 20 denotes a striker that protrudes from the seat back 10 b of the right seat 10 and that engages the lock mechanism 19 of the center seat 14.
The center seat 14 does not include an independent reclining operation unit. However, when the seat back 14b is connected to the seat back 10b of the right seat 10 via the lock mechanism 19, the right seat 10 is reclined by the reclining operation of the right seat 10. It will tilt together.
Further, a release strap 25 is provided at the right upper end portion of the seat back 14 b of the center seat 14, and the lock mechanism 19 can be unlocked by pulling the release strap 25.

  By the way, as shown in FIGS. 5 to 7, the tilt bracket 16 has predetermined ones around the first rotation shaft 17 and the second rotation shaft 18 on one end side (lower end side) and the other end side (upper end side). Notch portions 21 and 22 each having an angular range cut out in an arc shape are provided, and the restricting portions 21a and 21b and the restricting portions 22a and 22b are formed by edges facing both ends of the notch portions 21 and 22 in the circumferential direction. Each is composed.

On the other hand, on the side surface of the frame portion of the seat cushion 14 a of the center seat 14, a cushion side stopper 23 that protrudes into the notch portion 21 on one end side of the tilt bracket 16 is provided, and the frame portion of the seat back 14 b of the center seat 14 is provided. The back side stopper 24 which protrudes in the notch part 22 of the other end side of the tilt bracket 16 is provided in the side surface.
The cushion side stopper 23 is formed in a substantially arc shape with the first rotation shaft 17 as the center, and the front lower end side of the tilt bracket 16 is brought into contact with the front end face of the regulation portion 21a on the lower end front side of the tilt bracket 16. The tilting bracket 16 is restricted from tilting toward the rear upper side by contacting the rear end surface with a regulating portion 21b on the lower end rear side of the tilting bracket 16.
Further, the back-side stopper 24 is formed in a substantially arc shape with the second rotation shaft 18 as the center, and the front end surface of the back-side stopper 24 can be brought into contact with the restricting portion 22a on the upper end front side of the tilting bracket 16, and the rear end surface Can be brought into contact with the restricting portion 22b on the rear side of the upper end of the tilt bracket 16. In this embodiment, the restricting portion 22a constitutes the front restricting portion in the present invention, and the restricting portion 22b constitutes the rear restricting portion in the present invention.

Here, the restricting portion 22a on the upper end front side of the tilt bracket 16 has a first set angle θ1 about the second rotation shaft 18 from the line q connecting the first rotation shaft 17 and the second rotation shaft 18. The upper end rear restricting portion 22b is set to the front position, and is set to the rear position by the second set angle θ2 larger than the first set angle θ1 from the line q around the second rotation shaft 18. ing.

FIG. 8 sequentially shows the state of change when the seat back 14b of the center seat 14 in the raised state is moved forward by (A), (B), (C), and FIG. 9 shows the state of being moved forward. The changes when the seat back 14b is caused are sequentially shown in (D) and (C).
Hereinafter, the operation at the time of storing and unfolding the center seat 14 will be described with reference to these drawings.

When the seat back 14b in the raised state shown in FIG. 8A is moved forward, first, the release strap 25 is pulled to release the lock mechanism 19, and the seat back 14b of the center seat 14 is moved to the seat back of the right seat 10. Release for 10b.
As a result, as shown in FIG. 8B, the tilting bracket 16 receives the force of the biasing spring 30 and falls forward about the first rotary shaft 17 on the lower end side, and then continues to FIG. ), The seat back 14b is tilted about the second rotation shaft 18 on the upper end side of the tilt bracket 16. At this time, as shown in FIG. 7, the forward tilt of the tilt bracket 16 is regulated by the front end surface of the cushion side stopper 23 coming into contact with the regulating portion 21a on the lower end front side of the tilt bracket 16, and the seat back 14b is tilted. As shown in FIG. 6, the front end surface of the back side stopper 24 is regulated by abutting against the regulating portion 22 a on the front side of the upper end of the tilt bracket 16.

  Thereafter, the side portion of the seat cushion 14a with the seat back 14b superimposed on the upper surface side is pushed upward, and the seat cushion 14a is flipped up and turned to the side portion of the right seat 10 together with the seat back 14b. Thereby, a walking space is created between the left and right seats 10 and 11, and an occupant can walk before and after the second row seat 2B.

Further, when the center seat 14 is deployed from this state, the seat cushion 14a is tilted to the side of the right seat 10 together with the seat back 14b (the state shown in FIG. 8C), and the seat back 14b is manually moved from this state. Bring it backwards.
Thereby, as shown in FIG. 9D, the seat back 14b first rotates to the upper rear side around the second rotation shaft 18 on the upper end side of the tilt bracket 16. At this time, since the tilting bracket 16 is urged downward by the urging spring 30, the seat back 14 b rotates preferentially around the second rotation shaft 18.

When the seat back 14b rotates about the second rotation shaft 18 by a set angle (from the line q to the second set angle θ2), the rear end surface of the back side stopper 24 is tilted as shown in FIG. The bending angle between the seat back 14b and the tilting bracket 16 is substantially fixed.
Thereafter, when the seat back 14b is further raised, the tilting bracket 16 turns to the upper rear side about the first rotation shaft 17, and the locking mechanism 19 on the side portion of the seat back 14b is connected to the striker 20. When engaged, the rotation of the seat back 14b is locked.
It should be noted that depending on how the force is applied to cause the seat back 14b, there may be a situation where the seat back 14b fluctuates back and forth around the second rotation shaft 18, but the tilting bracket 16 is provided with a biasing spring 30 attached thereto. The force is always applied to the front lower side, the second set angle θ2 is set larger than the first set angle θ1, and the rear end surface of the back side stopper 24 is brought into contact with the restricting portion 22b of the tilt bracket 16. Since the bending angle between the tilting bracket 16 and the seat back 14b becomes large and tends to be stable when coming into contact, the bending angle between the seat back 14b and the tilting bracket 16 is maintained almost stably during the raising operation.

  As a result, the seat back 14b of the center seat 14 is integrated with the seat back 10b of the right seat 10, and the inclination angle of the seat back 14b is adjusted by the reclining operation of the right seat 10. During the reclining operation, when the seat back 14 b reaches the rear side tilt regulation position, the lower end rear regulation part 21 b of the tilt bracket 16 contacts the rear end surface of the cushion side stopper 23.

As described above, in the center seat 14, the restricting portions 22a and 22b and the back side stopper 24 of the tilt bracket 16 are set so that the second set angle θ2 is larger than the first set angle θ1. Therefore, during the raising operation of the seat back 14b, the bending angle between the seat back 14b and the tilting bracket 16 can be increased, and the bending angle between the seat back 14b and the tilting bracket 16 can be stably maintained on the side where the state is easily stabilized. Can do.
For this reason, it is possible to obtain a stable raising operation of the seat back 14b while reducing the thickness of the seat back 14b by employing the tilt bracket 16.

  Further, the center seat 14 is provided with the restricting portions 22a and 22b and the back side stopper 24 of the tilt bracket 16 so that the second set angle θ2 is larger than the first set angle θ1. The tilt bracket 16 is tilted rearward by the same angle as that in the normal posture (forward tilt) shown in FIG. 4, and the seat back 14b is prevented from being locked to the seat back 10b of the right seat 10 in this state. can do.

  That is, the height of the lock mechanism 19 of the seat back 14b is determined by the tilt angle of the tilt bracket 16 and the seat back 14b around the first rotating shaft 17 and the second rotating shaft 18, but the tilt bracket 16 and the seat When the backs 14b are inclined at the same angle in the forward and backward directions with respect to the normal posture, the height of the lock mechanism 19 is the same as that in the normal posture, and the lock mechanism 19 is locked with the striker 20. On the other hand, in the center seat 14 of this embodiment, the reverse inclination angle of the seat back 14b with respect to the tilt bracket 16 is caused by the contact between the restriction portion 22a and the back-side stopper 24 to the first set angle θ1 (first Therefore, the height of the lock mechanism 19 and the striker 20 do not match even if the tilt bracket 16 tilts backward. Accordingly, it is possible to reliably prevent the seatback 14b from being locked by tilting backward by the same angle as when the tilt bracket 16 is in the normal posture.

  In the case of this embodiment, the plate-shaped tilt bracket 16 is provided with arc-shaped notches 21 and 22, and the restricting portions 21 a, 21 b, 22 a, and 22 b are configured by the edges facing the notches 21 and 22. In addition, since the cushion side stopper 23 and the back side stopper 24 are inserted and arranged in the notches 21 and 22, respectively, the manufacturing cost can be reduced by simplifying the structure and facilitating the manufacturing. .

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

14 ... Center seat (vehicle seat)
DESCRIPTION OF SYMBOLS 14a ... Seat cushion 14b ... Seat back 16 ... Tilt bracket 17 ... 1st rotating shaft 18 ... 2nd rotating shaft 22 ... Notch part 22a ... Restriction part (front side regulation part)
22b ... Regulator (rear regulator)
24 ... Back side stopper
30: Biasing spring θ1: First set angle θ2: Second set angle

Claims (2)

A tilt bracket having a first rotating shaft pivotally supported by the seat cushion and a second rotating shaft pivotally supported by the seat back is provided, and the seat back can tilt to the seat cushion via the tilt bracket. A vehicle seat reclining device connected to
A back-side stopper that protrudes toward the tilt bracket side is provided on the seat back,
The tilt bracket is provided with a front side restricting portion that contacts the front surface of the back side stopper, and a rear side restricting portion that contacts the rear surface of the back side stopper,
The front restricting portion is set at a front position by a first set angle about the second rotation axis from a line connecting the first rotation axis and the second rotation axis,
The rear side restricting portion is set at a rear position by a second set angle larger than the first set angle from the line around the second rotation axis ,
A reclining device for a vehicle seat , wherein an urging spring is provided to urge the tilt bracket in a direction of tilting the front lower portion around the first rotation shaft .   The notch part which forms the said front side regulation part and the rear side regulation part is provided in the said inclination bracket, The said back side stopper protrudes and is arrange | positioned inside the said notch part, The Claim 1 characterized by the above-mentioned. The reclining device of the vehicle seat as described.

Images