JP2018079858A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which can contribute to improvement of use feeling.SOLUTION: A vehicle seat includes: a seat cushion; a seat back including a seat back frame 41 which is supported by a rear end part of the seat cushion so as to tilt and a support part which can support a side part of a seating person; a reclining mechanism which causes the seat back 40 to tilt relative to the seat cushion; and a support part moving mechanism 70 which holds the support part 42. The support part 42 can move between a support position where a protruding length from the seat back frame 41 is large and an open position where the protruding length is smaller than when the support part 42 is at the support position. The support part moving mechanism 70 moves the support part 42 from the support position to the open position in conjunction with reclining of the seat back 40.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a vehicle seat.

Conventionally, a vehicle seat including a seat cushion and a seat back attached to a rear end portion of the seat cushion so as to be tiltable with respect to the seat cushion is known.
The vehicle seat of Patent Document 1 reduces the level difference between the seat back and the seat cushion by raising the rear end portion of the seat cushion when the seat back is tilted backward to be fully flat. As a result, the comfort of the occupant during full flatness can be improved, and the feeling of use of the vehicle seat can be improved.

JP 2003-118455 A

  By the way, in such a vehicle seat, a step may be formed in a portion other than between the seat back and the seat cushion. As an example of the step, there is a support portion that supports a side portion of a seated person provided at both ends in the width direction of the seat back. In the said patent document 1, the usability | use_condition of such a support part is not considered. For this reason, the room for improvement is left about the usability of the passenger | crew of the vehicle seat provided with a support part.

  A vehicle seat that solves the above problems includes a seat cushion, a seat back frame that is tiltably supported by a rear end portion of the seat cushion, and a seat back that includes a support portion that can support a side portion of a seated person. A vehicle seat comprising a reclining mechanism for tilting the seat back relative to the seat cushion, and a support part moving mechanism for holding the support part, wherein the support part protrudes from the seat back frame. The support portion is movable between a support position having a large amount and an open position having a projection amount smaller than the support position, and the support portion moving mechanism is interlocked with a backward tilt of the seat back, and the support portion is moved to the support portion. Move from the support position to the open position.

  According to the above configuration, when the seat back is tilted backward, the support portion moves to the open position where the amount of protrusion from the seat back frame is small. For this reason, while the support portion can support the side of the seated person until the seat back is largely tilted backward, when the seat back is largely tilted backward, the amount of protrusion is reduced, and the support portion moves the occupant on the seat back. It becomes difficult to be disturbed. For this reason, it can contribute to the improvement of the usability of the passenger | crew of a vehicle seat.

  In the vehicle seat, the seat cushion includes a support portion that supports the seat back so as to be tiltable, and the support portion moving mechanism is engaged with the support portion according to a rearward tilt angle of the seat back. The support part includes a restricting part that restricts movement of the support part from one of the support position and the open position to the other of the support position and the open position.

  According to the above configuration, since the movement of the support portion can be restricted by the support portion provided in the seat cushion, an increase in the number of parts can be suppressed as compared with a case where a member for restricting the movement of the support portion is newly added. .

  The said vehicle seat WHEREIN: The said support part movement mechanism is provided with the urging | biasing part which urges | biases so that the said support part may go to the other of the said support position and the said open position from one of the said support position and the said open position.

  According to the above configuration, since the support portion is urged from one of the support position and the open position to the other of the support position and the open position by the urging portion, the support portion is easily held at the other of the support position and the open position. .

  In the vehicle seat, the seat cushion is interlocked with a cushion frame, a cushion portion attached to the cushion frame, and a rearward tilt of the seat back, and at least a part of the cushion portion is raised with respect to the cushion frame. A moving mechanism is provided.

  According to the above configuration, at least a part of the cushion portion rises with respect to the cushion frame in conjunction with the rearward tilt of the seat back, so that a seat arrangement according to the rear tilt of the seat back can be realized.

  According to the vehicle seat, it is possible to contribute to an improvement in the feeling of use.

The side view which shows schematic structure of the vehicle seat. The perspective view which abbreviate | omitted the cushion member from the vehicle seat of FIG. The disassembled perspective view of the vehicle seat of FIG. The side view which shows a support part moving mechanism when the support part of FIG. 3 exists in a support position. The side view which shows a support part moving mechanism when the support part of FIG. 3 exists in an open position. Sectional drawing which follows the 5-5 line of FIG. The fragmentary sectional view which expanded a part of FIG.

  Hereinafter, an embodiment of a vehicle seat will be described with reference to the drawings. The vehicle seat of this embodiment can be used for various vehicles such as automobiles and railways. In the following, the right side indicates the right hand side of the seated person seated on the vehicle seat, and the left side means the left hand side of the seated person seated on the vehicle seat.

  As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 20 and a seat back 40 attached to the rear end of the seat cushion 20 so as to be tiltable. A headrest 11 is provided at the upper end of the seat back 40.

  A pair of left and right lower rails R <b> 1 extending in the front-rear direction of the vehicle seat 10 is provided on the floor F of the vehicle. Each of the lower rails R1 is attached with an upper rail R2 that can move relative to the lower rail R1 along the extending direction. The vehicle seat 10 is supported above the seat slide rail R formed by each of the lower rail R1 and the upper rail R2. A lifter that moves the entire vehicle seat 10 upward may be provided between the vehicle seat 10 and the seat slide rail R.

  As shown in FIG. 2, the seat cushion 20 includes a cushion frame 21 that is mounted on the upper rail R <b> 2 (see FIG. 1), and a cushion portion 24 that is placed on the cushion frame 21 via the moving mechanism 30. . As shown in FIG. 3, the cushion frame 21 includes a rectangular frame 22 and a bottom plate 23 attached to the frame 22. The cushion portion 24 includes a seat pan 25 and a cushion member 26 (see FIG. 1) placed on the seat pan 25. The seat pan 25 is disposed from the front end portion to the rear end portion of the seat cushion 20 and supports substantially the entire cushion member 26 from below.

  As shown in FIG. 2, the seat back 40 includes a seat back frame 41 attached to the rear end portion of the cushion frame 21 via the reclining mechanism 50, and a pair of left and right support portions 42 attached to the seat back frame 41. ing. A cushion member 43 (see FIG. 1) is attached to the front part of the seat back frame 41 and the support part 42 (on the back side of the seated person).

  As shown in FIG. 3, the reclining mechanism 50 has a release state in which the rearward tilt angle D can be changed at the rear end portion of the cushion frame 21 and the other end portion in the width direction (right end portion in the present embodiment). And a reclining lock device 53 for switching between a fixed state that cannot be changed. The reclining lock device 53 can be switched between a released state and a fixed state by a user via an operation unit such as a lever. The reclining mechanism 50 includes a support portion 51 provided at the rear end portion of the cushion frame 21 and one end portion in the width direction (the left end portion in the present embodiment). The support portion 51 is provided on the seat cushion 20 and is rotatably attached to the lower end portion of the seat back frame 41. When the seat back frame 41 rotates around the cushion frame 21 and the support portion 51, a rearward tilt angle D (see FIG. 1) that is an angle of the seat back frame 41 with respect to the cushion frame 21 changes.

  As shown by a two-dot chain line in FIG. 1, the reclining mechanism 50 can tilt the seat back frame 41 (seat back 40) back to a so-called full flat state. The rearward tilt angle DX in the full flat state is about 180 degrees. When the seat back 40 tilts backward by the reclining mechanism 50, the lock mechanism 60 that restricts the movement of the cushion portion 24 shown in FIG. 3 according to the angle D, the moving mechanism 30 that moves the cushion portion 24, and the support portion The support part moving mechanism 70 which moves 42 operates.

The locking mechanism 60 will be described with reference to FIG.
The lock mechanism 60 shown in FIG. 3 switches between a restricted state in which the relative movement between the cushion portion 24 and the cushion frame 21 is restricted and a released state in which the relative movement is allowed. The lock mechanism 60 includes a U-shaped striker 61 provided on the seat pan 25 and a lock member 62 provided on the cushion frame 21. Specifically, the lock member 62 is attached to a hole 23 </ b> A formed in the approximate center of the bottom plate 23. When the striker 61 is inserted into the recess 62B of the lock member 62 and is sandwiched between the movable members 62A, a restricted state is formed. Further, the release state is formed when the movable member 62A is separated from the recess 62B and the striker 61 can be separated from the recess 62B of the lock member 62.

  When the seat back 40 tilts backward and the rearward tilt angle D becomes equal to or greater than the release angle DL, the cable (not shown) pulls the movable member 62A, and the striker 61 shown in FIG. 3 can come out of the recess 62B of the lock member 62. It becomes like this. When the seatback 40 is returned to the front and the rearward tilt angle D becomes smaller, the cable (not shown) is loosened, and the striker 61 fitted in the recess 62B is sandwiched by the movable member 62A shown in FIG.

The moving mechanism 30 will be described with reference to FIG.
As illustrated in FIG. 3, the moving mechanism 30 includes a pair of left and right first links 31 and a pair of left and right second links 32 provided in front of the first link 31. Each first link 31 has a lower end 31A (one end) rotatably attached to an end of the first connecting member 33 extending in the width direction of the vehicle seat 10, and an upper end 31B (the other end) is a seat. The rear end portion of the pan 25 is rotatably supported. The first connection member 33 is attached to the cushion frame 21. For this reason, the lower end portion 31 </ b> A of the first link 31 is rotatable with respect to the cushion frame 21. Each second link 32 has a lower end 32A (one end) rotatably attached to an end of a second connection member 34 extending in the width direction of the vehicle seat 10, and an upper end 32B (the other end) is a seat. The rear end portion of the pan 25 is rotatably supported. The second connection member 34 is attached to the cushion frame 21. For this reason, the lower end portion 32 </ b> A of the second link 32 is rotatable with respect to the cushion frame 21. The lower end portion 31 </ b> A of the first link 31 is attached below the cushion frame 21 with respect to the lower end portion 32 </ b> A of the second link 32.

  The moving mechanism 30 is interlocked with the seat back 40 (see FIG. 3) by the transmission unit 54. The transmission part 54 includes a first transmission member 55 rotatably supported by the support part 51, a second transmission member 56 rotatably supported by the cushion frame 21, a first gear 57, a second gear 58, and And a third gear 59. The first gear 57 and the third gear 59 are sector gears, and the second gear 58 is a pinion gear. The first gear 57 rotates integrally with the second transmission member 56. The third gear 59 is connected to the lower end portion 31 </ b> A of the first link 31. The second gear 58 meshes with the first gear 57 and the third gear 59 and transmits the torque of the first gear 57 to the third gear 59. The transmission unit 54 accelerates the rotation input to the first gear 57 and outputs it from the third gear 59.

  When the rearward tilt angle D is less than the set angle DM, the cushion portion 24 including the seat pan 25 and the cushion member 26 is located at the first position. When the seat back 40 tilts backward and the rearward tilt angle D becomes equal to or larger than the set angle DM, the second transmission member 56 and the first gear 57 rotate together, and this rotation is the second gear 58 and The first link 31 is rotated around the lower end 31 </ b> A via the third gear 59. As a result, the upper end portion 31B of the first link 31 moves upward and forward, so that the rear end portion of the seat pan 25 attached to the upper end portion 31B of the first link 31 moves upward and forward. As the seat pan 25 moves, the second link 32 attached near the front end of the seat pan 25 rotates around the lower end 32A. As a result, the upper end portion 32B of the second link 32 moves upward and forward, so that the front end portion of the seat pan 25 attached to the upper end portion 32B of the second link 32 moves upward and forward. For this reason, the cushion member 26 moves upward and forward together with the seat pan 25, and the cushion portion 24 moves to the second position above and forward of the first position.

  When the rearward tilt angle D is less than the set angle DM, the seat pan 25 is held in a rearward tilt state in which the rear end portion is lower than the front end portion. At this time, the upper surface of the cushion member 26 shown by the solid line in FIG. 1 is also held in a rearward inclined posture in which the rear end portion is lower than the front end portion. When the rearward tilt angle D becomes equal to or larger than the set angle DM and the moving mechanism 30 operates, the rear end portion has a higher lift amount than the front end portion. Therefore, the height position of the front end portion of the seat pan 25 is The height position of the rear end portion substantially coincides and is held in a parallel posture parallel to the floor surface F. At this time, the cushion member 26 indicated by the two-dot chain line in FIG. 1 is also held in a parallel posture parallel to the floor surface F, with the height position of the front end portion substantially the same as the height position of the rear end portion. The

  As shown in FIG. 1, the set angle DM is set to be larger than the release angle DL. For this reason, when the rotation of the first link 31 is started, the lock mechanism 60 is switched to the released state prior to the start. For this reason, the lock mechanism 60 does not restrict the movement of the seat pan 25. When the rearward tilt angle D is equal to or greater than the release angle DL and the lock mechanism 60 is in the release state, the cushion portion 24 is movable with respect to the cushion frame 21, but the cushion portion 24 and the reclining mechanism 50 are not connected to each other. 54 is mechanically connected. In this way, even when an external force is applied to the cushion portion 24, the movement of the cushion portion 24 is suppressed by the force from the reclining mechanism 50 side. Further, since the transmission unit 54 functions as a speed increasing mechanism, the rearward tilt angle D necessary for sufficiently moving the moving mechanism 30 can be reduced. For this reason, for example, it can set so that the cushion part 24 may move only near the state of a full flat.

The support part 42 and the support part moving mechanism 70 are demonstrated with reference to FIGS.
As shown in FIG. 3, the support portion 42 is formed by a plate-like member extending along the longitudinal direction of the seat back 40. The support part moving mechanism 70 includes a support shaft 71 attached to the support part 42 along the longitudinal direction of the support part 42, and a plate-like restriction part 72 attached to the seat back frame 41 via a rotation shaft 72C. It has. The restricting portion 72 rotates together with the seat back frame 41 around the rotation axis 52 of the seat back frame 41 provided in the support portion 51.

  An urging portion 73 is attached to an intermediate portion of the support shaft 71 in the axial direction. The urging portion 73 is, for example, a coil spring, and applies a force that rotates to the support shaft 71 from the outside in the width direction of the seat back 40 toward the inside. The inward rotation of the support shaft 71 is restricted by the restriction portion 72.

  As shown in FIG. 4, the restricting portion 72 has a recess 72A formed at the upper end, and the lower end of the support shaft 71 bent in an L shape is fitted into the recess 72A. The lower end surface 72 </ b> B of the restricting portion 72 is provided so as to be able to contact the outer periphery of the support portion 51. An urging portion 72D (see FIG. 3) is attached to the rotating shaft 72C of the restricting portion 72, and the urging portion 72D supports the lower end surface 72B of the restricting portion 72 by urging the restricting portion 72 to rotate. It is pressed toward the outer periphery of the part 51. On the outer periphery of the support portion 51, there are a first area 51A on the arc and a second area 51B on the rotation center side of the first area 51A on the rear side of the vehicle seat 10 relative to the first area 51A. Is formed. A step 51C is formed between the first region 51A and the second region 51B.

  As shown by the solid line and the two-dot chain line in FIG. 4, in the range where the rearward tilt angle D is less than the open angle DS, the restricting portion 72 has the lower end surface 72 </ b> B of the restricting portion 72 in the first position as the seat back 40 tilts. It moves integrally with the seat back frame 41 (see FIG. 3) along the area 51A. At this time, the support shaft 71 is held at the innermost first rotation position (the position in FIG. 6 and the position of the two-dot chain line in FIG. 7) by the restricting portion 72 and the urging portion 73.

  As shown in FIG. 5, when the seat back 40 (see FIG. 3) further tilts backward and the rearward tilt angle D becomes equal to or greater than the open angle DS, the restricting portion 72 has a biasing portion 72 </ b> D (see FIG. 3). It rotates around the rotating shaft 72C by force and moves over the step portion 51C of the support portion 51 onto the second region 51B. At this time, the restricting portion 72 rotates the support shaft 71 from the inner side to the outer side in the width direction of the seat back 40. For this reason, the support shaft 71 is held by the restricting portion 72 at the second rotation position outside the first rotation position (the position indicated by the solid line in FIG. 7). At this time, the lower end surface 72B of the restricting portion 72 is in contact with the outer peripheral portion of the support portion 51, and the restricting portion 72 is further restricted from rotating around the rotation shaft 72C.

  When the rearward tilt angle D is greater than or equal to the open angle DS and less than the open angle DS, the restricting portion 72 rotates around the rotation shaft 72C while moving on the outer periphery of the support portion 51, and climbs over the stepped portion 51C to reach the first region 51A. Move up. As a result, the support shaft 71 returns to the first rotational position.

  6 and 7, when the support shaft 71 is in the first rotation position, the left and right support portions 42 have the largest protrusion amount L1 from the seat back frame 41. Is held in the support position. As shown by the solid line in FIG. 7, when the support shaft 71 is in the second rotational position, the support portion 42 is held at the open position where the protrusion amount L2 from the seat back frame 41 is the smallest protrusion amount L2. . At this time, the front surface of the seat back 40 in the support portion 42 is substantially parallel to the width direction of the seat back 40.

The vehicle seat 10 has the following operations and effects.
(1) When the seat back 40 tilts backward, the vehicle seat 10 moves the support portion 42 to the open position where the protrusion amount L is small. For this reason, the support part 42 can support the side of the seated person until the seat back 40 is largely tilted backward. On the other hand, when the seat back 40 is largely tilted backward, the protruding amount L of the support part 42 is reduced. 42 makes it difficult for the passengers on the seat back 40 to move. For this reason, it can contribute to the improvement of the occupant's usability of the vehicle seat 10.

  (2) Since the vehicle seat 10 can restrict the movement of the support portion 42 by the support portion 51 provided in the seat cushion 20, compared to a case where a member for restricting the movement of the support portion 42 is newly added, Increase in the number of parts can be suppressed.

  (3) Since the support portion 42 is urged by the urging portion 73 from one of the support position and the open position to the other of the support position and the open position by the urging portion 73, the vehicle seat 10 is moved to the support position and the open position. Easy to hold on the other.

  (4) The vehicle seat 10 realizes a seat arrangement according to the backward tilt of the seat back 40 because at least a part of the cushion portion 24 rises with respect to the cushion frame 21 in conjunction with the backward tilt of the seat back 40. it can.

In addition, you may change the said embodiment as follows.
A support unit moving mechanism that moves the support unit 42 with an electric actuator may be provided. In this case, for example, the support unit moving mechanism includes a control device that drives the electric actuator in accordance with the output of the sensor that detects the backward tilt angle D and rotates the support shaft 71. When the rearward tilt angle D exceeds the open angle DS, the control device rotates the support shaft 71 and moves the support portion 42 from the support position to the open position. Further, the control device rotates the support shaft 71 to move the support portion from the open position to the support position when the rearward tilt angle D becomes less than the open angle DS.

  -The urging | biasing part 73 may provide the force which goes to an open position from a support position to the support part 42. FIG. In this case, the restricting portion 72 restricts the support portion 42 from moving from the support position to the open position.

DESCRIPTION OF SYMBOLS 10 ... Vehicle seat, 11 ... Headrest, 20 ... Seat cushion, 21 ... Cushion frame, 22 ... Frame, 23 ... Bottom plate, 23A ... Hole, 24 ... Cushion part, 25 ... Seat pan, 26 ... Cushion member, 30 ... Movement mechanism, 31 ... first link, 31A ... lower end, 31B ... upper end, 32 ... second link, 32A ... lower end, 32B ... upper end, 33 ... first connecting member, 34 ... second Connection member, 40 ... seat back, 41 ... seat back frame, 42 ... support portion, 43 ... cushion member, 50 ... reclining mechanism, 51 ... support portion, 51A ... first region, 51B ... first region, 51C ... Stepped portion 52 ... Shaft 53 ... Reclining lock device 54 ... Transmission portion 55 ... First transmission member 56 ... Second transmission member 57 ... First gear 58 ... Second gear 59 Third gear, 60 ... Lock mechanism, 61 ... Striker, 62 ... Lock member, 62A ... Movable member, 62B ... Recess, 70 ... Support part moving mechanism, 71 ... Support shaft, 72 ... Restriction part, 72A ... Recess, 72B ... Lower end surface, 72C ... rotating shaft, 72D ... urging unit, 73 ... urging unit, F ... floor surface, R ... seat slide rail, R1 ... lower rail, R2 ... upper rail.

Claims (4)

Seat cushion,
A seat back frame supported by a rear end portion of the seat cushion so as to be tiltable, and a seat back including a support portion capable of supporting a side portion of a seated person;
A reclining mechanism for tilting the seat back with respect to the seat cushion;
A support part moving mechanism for holding the support part, and a vehicle seat comprising:
The support part is movable between a support position having a large protruding amount from the seat back frame and an open position having a smaller protruding amount than the support position.
The support part moving mechanism is interlocked with the backward inclination of the seat back, and moves the support part from the support position to the open position.
Vehicle seat. The seat cushion includes a support portion that supports the seat back to be tiltable,
The support part moving mechanism engages with the support part according to a rearward tilt angle of the seat back, so that the support part changes from one of the support position and the open position to the other of the support position and the open position. Provided with a regulation unit that regulates movement,
The vehicle seat according to claim 1. The support part moving mechanism includes a biasing part that biases the support part so as to go from one of the support position and the open position toward the other of the support position and the open position.
The vehicle seat according to claim 1 or 2. The seat cushion includes a cushion frame, a cushion portion attached to the cushion frame, and a moving mechanism that moves at least a part of the cushion portion relative to the cushion frame in conjunction with a backward tilt of the seat back.
The vehicle seat according to any one of claims 1 to 3.

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