JP5481913B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat in which a seat back can be adjusted in a backrest angle and a walk-in operation in which the seat back is tilted to a forward tilt position is also possible.

  Conventionally, in a vehicle seat, the seat back is tilted to a forward tilt position and the entire seat is slid to the front side of the vehicle, so that a space for getting on and off the rear seat without an entrance door behind the seat can be made. Some have a walk-in function. Here, Patent Document 1 below discloses a configuration of a vehicle seat having the above-described walk-in function.

  In this disclosure, the seat back is connected to the seat cushion via a reclining device that functions as a rotary shaft device that can be rotationally locked. This reclining device is configured to be switched between a locked state and a released state of tilting rotation of the seat back, and is normally held in a state of locking tilting rotation. The reclining device is configured to release the locked state by switching the vehicle seat to the walk-in posture and to switch to a state in which the seat back is allowed to rotate forward. .

JP 2009-23384 A

  However, in the prior art disclosed above, when the reclining device has an electric type configuration in which the seat back is tilted and rotated in accordance with the driving rotation of the electric motor, the seat back is locked as described above. There is a problem that a smooth switching operation such as releasing the seatback and immediately switching the seat back to the forward tilting posture cannot be performed.

  The present invention was devised to solve the above-described problems, and the problem to be solved by the present invention is that the seat back can be adjusted electrically even if the backrest angle adjustment operation can be performed electrically. The purpose of this is to make the walk-in operation for switching to a forward tilted posture smooth by making it unlocked.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
First, the first invention is a vehicle seat in which a seat back can be adjusted in a backrest angle and a walk-in operation in which the seat back is tilted to a forward leaning position is also possible. An electrically driven reclining device and a rotary hinge mechanism Have The reclining device couples the seat back to the seat cushion so as to be able to tilt and rotate. The rotary hinge mechanism supports the seat back so as to be tilted and rotated about a central axis different from the tilt rotation of the seat back via the reclining device. The reclining device has an electric drive type configuration in which the backrest angle of the seat back is changed or stopped in accordance with the electric drive. On the other hand, the rotating hinge mechanism is divided into a front part and a rear part in which the seat cushion is rotatably connected to each other, and the hinge rotation of each part is normally locked by a lock device. Unlocking-type rotary hinge structure that can be switched to a state in which the seat back can be rotated forwardly around the hinge connection point with the front part by performing the unlocking operation of the locking device. It has become.

  According to the first aspect of the invention, the seat back is adjusted by adjusting the backrest angle by the electrically driven reclining device. It is switched to a state where it can rotate forward and rotate around the hinge connection point with the front part. Thus, even if the adjustment operation of the seat back back angle can be performed electrically, the walk-in operation for switching the seat back to the forward tilting posture can be smoothly performed by the unlocking method.

  Next, according to a second aspect of the present invention, in the first aspect described above, the locking device includes a hook provided on a striker provided on one part of the front part or the rear part, and a hook provided on the other part. The member is hooked to be engaged and locked. The front part is connected to a buckle that is a fitting device for a seat belt apparatus in which a seat belt webbing is pulled out from a shoulder portion of the seat back. The front part is hinged to the rear part by a rotary hinge mechanism in a region above the connecting point with the buckle and below the central axis of the tilting rotation of the seat back by the reclining device. In addition, the engagement lock by the hook member and the striker is performed in a region on the rear side and the lower side of the connection point with the buckle.

  According to the second aspect of the invention, the seat occupant receives the input of a large load such that the seat occupant is thrown out to the front side of the vehicle due to the occurrence of a frontal collision, etc. The load in the forward rotation direction is input to the back. This load is input as a load in a direction in which the rear part of the seat cushion is rotated forward around the hinge connection point with respect to the front part via the reclining device in a rotation-retained state. However, the hinge connecting part and the locking device for receiving this load are arranged and set in each of the above-described regions so that a stable support force can be exhibited, so that the load can be received with a stable force. It is possible to configure a support structure that can be used.

  Next, according to a third aspect, in the second aspect described above, a central axis of tilting rotation of the seat back by the reclining device, a hinge connection point where the front part and the rear part are hinge-connected, and a hook member A triangle formed by connecting a lock point at which the striker engages and locks has an arrangement configuration that approximates a regular triangle.

  According to the third aspect of the invention, since the hinge connecting portion and the locking device are provided at the positions where the above-described arrangement relationship is established, the rear part of the seat cushion is moved forward about the hinge connecting point with respect to the front part. The load in the rotating direction and the load in the direction in which the rear part rotates backward around the striker with respect to the front part are each received with a stable force. Therefore, with the above-described support structure, the load in the forward tilt direction and the load in the rear tilt direction input to the seat back can be received with a stable force.

1 is a side view illustrating a schematic configuration of a vehicle seat according to a first embodiment. It is a perspective view showing frame structure of a vehicular seat. 1 is an external perspective view of a vehicle seat. FIG. 2 is a side view illustrating a state where the lock device is unlocked from the state of FIG. 1. FIG. 6 is a side view showing a state in which the seat back is brought down to a forward leaning position.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the vehicle seat 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 3, the vehicle seat 1 of the present embodiment is adopted as a second-row seat of a vehicle having a three-row seat, and a seat back 2 that serves as a backrest for a seated occupant, and a seating portion And the seat cushion 3. Here, the seat back 2 is supported by connecting the lower end portions of the left and right sides to the rear end portions of the left and right sides of the seat cushion 3 via the electrically driven reclining device 4.

  As shown in FIG. 2 in detail, each of the reclining devices 4 described above includes both leg portions of a gate-type back frame 2F forming the skeleton of the seat back 2, and the skeleton of the seat cushion 3 disposed on both outer sides thereof. And a plate-like frame (rear part 3B) that are connected to each other. Here, the back frame 2F is a long plate-like side frame that forms a skeleton on both the left and right sides of the seat back 2, and an inverted U-shaped upper frame that is bridged between the upper ends of these side frames and is rigidly coupled. It is configured in a gate shape.

  And in the gate shape inside of this back frame 2F, the plate-shaped reinforcement board 2H is spanned to the left and right, and is rigidly connected by two places. Further, a reinforcing pipe 2P made of a steel pipe pipe is bridged from side to side and rigidly connected to a lower end portion of the back frame 2F via a bracket 2J that supports an electric drive device 5 described later. As a result, the back frame 2F is assembled in a frame shape, and its bending strength and torsional strength are reinforced.

  In each of the reclining devices 4, the operation shaft 4 </ b> C inserted through the central portion thereof is integrally connected to each other by the rod 4 </ b> D inserted into the above-described reinforcing pipe 2 </ b> P. The electric drive device 5 arranged on the shaft is operated to rotate the shaft or to be rotated, so that the electric drive device 5 can be rotated or locked at the same time in synchronization with each other.

  Here, each of the reclining devices 4 described above is held in a state in which the backrest angle of the seat back 2 with respect to the seat cushion 3 is fixed as a state in which the reclining device 4 is normally rotated. Each reclining device 4 sets the backrest angle of the seat back 2 to the front side as shown in FIG. 3 in accordance with the movement of the rod 4D being rotated in one direction or the other direction by the electric drive device 5. Alternatively, the driving operation is performed so as to tilt backward.

  The basic configuration of each reclining device 4 described above is a known configuration disclosed in documents such as Japanese Patent Application Laid-Open No. 2008-18055, and detailed description thereof will be omitted. Briefly, the reclining device 4 is configured by assembling an external gear member having an external gear and an internal gear member having an internal gear, and the operation shaft 4C is operated to rotate the shaft by driving of the electric drive device 5. As a result, the external gear revolves while changing the meshing position with respect to the internal gear.

  And each reclining apparatus 4 is the state pressed by the pressing member provided between the external gear and the internal gear in the direction which both gears mesh with each other by the drive of the electric drive device 5 being stopped. Thus, it is configured to be held and kept in a rotationally locked state.

  Here, referring back to FIG. 2, the rotation driving operation of the rod 4D by the electric driving device 5 described above is performed using the electric motor 5A as a driving source, and the driving speed is adjusted so that the backrest angle of the seat back 2 can be easily adjusted. Is set to a relatively slow speed. Accordingly, the seat back 2 is configured to require a certain long time to move when the backrest angle is greatly changed.

  By the way, in the vehicle seat 1 of the present embodiment, when the occupant is away from the seating, the seat back 2 is brought down to the forward tilted position and the entire seat is slid forward to the front side of the vehicle, so Equipped with a walk-in function that allows a passenger to get on and off the rear seat without a seat (third row seat). Hereinafter, the configuration of the walk-in function will be described in detail.

  That is, as shown in FIG. 1, the seat cushion 3 has a skeleton structure in which a front part 3 </ b> A that forms the skeleton of the entire main part of the seat cushion 3 and a rear part 3 </ b> B that forms a connection part between the seat back 2. It is divided into two parts. The front part 3A and the rear part 3B are hingedly connected to each other by a support shaft 3C, and the locking device 10 provided in each rear part 3B is normally attached to the rear end of the front part 3A. It is held in a rotationally locked state by a structure that engages and locks the provided striker Ae.

  Here, on the vehicle outer side side portion of the front part 3A described above, although not shown, a buckle serving as a mounting tool for a seat belt apparatus of a type in which the seat belt webbing is pulled out from the shoulder opening portion of the seat back 2. 7 are connected. In the buckle 7, the lower end portion of the metal plate constituting the support portion on the base side is connected and fixed to the outer side plate portion Aa of the front part 3A by the connecting shaft 7A.

  And between the both-sides plate part Aa of the above-mentioned front side part 3A, the reinforcement pipe Ab which consists of a steel pipe pipe is spanned and rigidly connected. Here, in detail, the front side part 3A is a region above the connection point with the buckle 7 and below the central axis 4R of the tilting rotation of the seat back 2 by the reclining device 4, and the support shaft 3C. Is hinged to the rear part 3B so as to be rotatable. The front part 3A is engaged with the above-described latch 12 of each locking device 10 at the rear side and the lower side of the connecting point with the buckle 7 by the connecting shaft 7A. Is provided.

  Thereby, in the above-described region portion, a lock point at which the striker Ae and the latch 12 of each lock device 10 are engaged and locked is set. Further, the center axis point (center axis 4R) of the tilting rotation of the seat back 2 by the reclining device 4, the hinge connection point between the front part 3A and the rear part 3B by the support shaft 3C, and the striker Ae described above are arranged. The arrangement of the points is set so that the triangle formed by connecting the lock points has a shape that approximates a regular triangle.

  That is, the above three points are not arranged so that any one point is significantly separated from the other two arrangement dimensions, but the arrangement relations that are approximately approximate to each other are arranged. Is set to As a result, when the seated occupant receives an input of a large load that is thrown out toward the front of the vehicle due to the occurrence of a frontal collision or the like, the seat folds forward to the seat back 2 via the seat belt webbing that catches the occupant's body. Even when a rotational load is input, the load can be received with a stable force.

  Specifically, when a load in the forward-turning rotation direction is input to the seat back 2, the load is applied to the rear part 3B of the seat cushion 3 via the reclining device 4 in the rotation-retained state. Is input as a load in the direction of pre-rotation around the hinge connection point (support shaft 3C). However, the hinge connection point (support shaft 3C) and the lock point (engagement portion between the striker Ae and the lock device 10) for receiving this load are arranged and set in the above-described respective region portions, so that The dimension between the support points that can exhibit a stable support force in the height direction is secured, and the above-described load is supported by the stable support force.

  Further, the hinge connection point (support shaft 3C) and the lock point (engagement portion between the striker Ae and the lock device 10) are provided at positions that are close to the above-described equilateral triangle, so that the rear side The load in the direction in which the part 3B rotates forward around the support shaft 3C with respect to the front part 3A and the load in the direction in which the rear part 3B rotates rearward around the striker Ae with respect to the front part 3A are also stable. It will be received by force.

  Therefore, with the above-described support structure, the load in the forward tilt direction and the load in the rear tilt direction that are input to the seat back 2 can be received with a stable force. The above-described seat back 2 is operated by a lever operation of a walk-in lever (not shown) provided at a portion such as a shoulder portion of the seat back 2 to release the locked state of the locking device 10 (see FIG. 4), and the rear part. Rotate forward around the support shaft 3C integrally with 3B (see FIG. 5). Specifically, a torsion spring Ca that urges the rear part 3B in a direction that always rotates forward with respect to the front part 3A is hooked on the arrangement portion of the support shaft 3C described above.

  The torsion spring Ca is disposed by being twisted around the support shaft 3C, and one end of the torsion spring Ca is applied to the bottom surface of the top plate portion Ac of the front side part 3A to be locked. The end is applied to and locked by a locking plate Ba formed by bending at the front edge of the rear part 3B. As a result, the seat back 2 is brought down to a position where the seat back 2 assumes a forward leaning posture by the biasing force of the torsion spring Ca when the locked state of the locking device 10 is released by an operation of a walk-in lever (not shown). (See FIG. 5).

  Here, as shown in FIG. 5, the forward tilt rotation of the seat back 2 is such that the locking plate Ba formed on the rear part 3B is formed at the rear end of the top plate part Ac of the front part 3A. It can be stopped at a position where it comes into contact with the locking portion Ad. Although the illustration of the walk-in lever is omitted, the slide lock state of the slider device connecting the vehicle seat 1 to the floor so as to be slidable in the vehicle front-rear direction is performed. Is also released.

  As a result, the entire seat can be slid to the front side of the vehicle with the seat back 2 in the forward tilted position, and a space for getting on and off the rear seat without a passenger door (third row seat) behind it can be made. Can do. When the vehicle seat 1 that has been walked in as described above is returned to the original seating and useable posture state, the vehicle seat 1 is returned to the position before sliding, and the seat back 2 is tilted backward. As a result, the locking device 10 is pushed into the striker Ae to lock the engagement, so that the vehicle seat 1 is returned to the posture state before the walk-in operation.

  Hereinafter, the engagement lock structure with respect to the striker Ae of the locking device 10 mentioned above is demonstrated. The locking device 10 is provided fixed to the rear part 3B, and has an operation structure that can be engaged and locked with the striker Ae provided on the front part 3A. Specifically, as shown in FIG. 1, the locking device 10 includes a base plate 11 serving as a substrate, a latch 12 and a pole 13 rotatably connected to the base plate 11, and the latch 12 and the pole. 13 and a tension spring 14 hooked between them.

  Specifically, the base plate 11 is integrally connected to the rear part 3B by a connecting shaft 11B. The latch 12 is rotatably connected to the base plate 11 by a support shaft 12E, and the upper jaw portion 12A is moved to the striker by the movement of the striker Ae being relatively pushed into the receiving port 11A formed in the base plate 11. Pushed by Ae, the lower jaw portion 12B is turned to the back side of the striker Ae to close the receiving port 11A.

  The pole 13 is rotatably connected to the base plate 11 by a support shaft 13D. The pawl 13 is pushed to the position where the latch 12 is engaged with the striker Ae, and the engaging force abutted against the latch 12 by the urging force of the tension spring 14 hooked between the pawl 13 and the latch 12 is thus achieved. In this state, the latch 12 is locked in the posture state in which the receiving port 11A is closed.

  More specifically, the latch 12 is connected to a hanging pin 12C inserted into a curved long hole 11C formed through the base plate 11, and the hanging pin 12C slides in the long hole 11C. It can be rotated within the range. As shown in FIG. 4, the latch 12 is in a state before the engagement lock with the striker Ae by the urging force of the tension spring 14 hooked between the hook pin 12C and the hook portion 13B of the pole 13. Normally, the hooking pin 12C is held at a rotational position where it is locked to the end of the long hole 11C as being rotated and biased counterclockwise in the drawing.

  The above-described latch 12 is always held in a posture state in which the upper jaw portion 12A is projected from the mouth of the receiving port 11A formed in the base plate 11 before the engagement lock with the striker Ae. . The latch 12 is rotated in the clockwise direction in the figure against the urging of the tension spring 14 so that the upper jaw 12A is pushed away by the striker Ae when the striker Ae is pushed into the mouth of the receiving port 11A. . Thereby, the lower jaw part 12B is turned around so as to close the receiving port 11A in the form of going around behind the striker Ae (see FIG. 5).

  Thus, the latch 12 is in a state in which the corner 12D formed on the outer peripheral portion thereof is abutted against the corner 13A formed on the pole 13 and is rotated. Here, referring back to FIG. 1, the pole 13 is normally urged to rotate in the clockwise direction in the figure by the urging force of the tension spring 14 that is hooked between the pawl 13 and the latch 12. 13A is held in the initial rotational position state in which 13A rides on the corner 12D of the latch 12.

  As shown in FIG. 4, the pole 13 has the upper jaw portion 12 </ b> A of the latch 12 pushed by the striker Ae in the clockwise direction in the drawing, and the corner portion 13 </ b> A falls below the step of the corner portion 12 </ b> D of the latch 12. As a result, the latch 12 is prevented from rotating in the clockwise direction (locked state). That is, the pole 13 is rotated in the clockwise direction in the figure by the urging force of the tension spring 14 when the corner portion 13A is removed from the state of riding on the corner portion 12D by the rotation of the latch 12 described above.

  Thereby, the pole 13 will be in the state which made the corner | angular part 13A fall under the level | step difference of the corner | angular part 12D. In this state, the latch 12 is in a rotational posture in which the receiving port 11A is closed by the lower jaw portion 12B. Therefore, from this state, even if the latch 12 is rotated counterclockwise by the urging force of the tension spring 14, the corner portion 12D is abutted against the corner portion 13A of the pole 13 and its rotational movement is prevented. Therefore, the latch 12 is held in a rotationally locked state (locked state).

  Thus, the striker Ae is held in a locked state so as not to come out of the receiving port 11A by the engagement in which the lower jaw portion 12B of the latch 12 is turned to the back side. In this engagement locked state of the striker Ae by the latch 12 and the pole 13, the cable 15 hooked on the cable hooking portion 13C of the pole 13 is pulled by the operation of the above-described walk-in lever (not shown). It is canceled with.

  Specifically, when the cable 15 is pulled and the pole 13 is rotated in the counterclockwise direction in the drawing, the corner portion 13A is removed from the state where it is abutted against the corner portion 12D. As a result, the latch 12 is rotated counterclockwise by the urging force of the tension spring 14 so that the upper jaw portion 12A operates to discharge the striker Ae to the outside of the receiving port 11A, and the corner portion 12D has the corner portion 13A. Move so that it sneaks underneath. In this state, when the pulling operation of the cable 15 (the operation of the walk-in lever) is stopped, the corner portion 13A of the pole 13 rides on the corner portion 12D of the latch 12 again by the biasing force of the tension spring 14. Thus, the lock device 10 is returned to the initial state where the lock device 10 can be engaged and locked with the striker Ae.

  Thus, according to the vehicle seat 1 of the present embodiment, the seat back 2 is adjusted by adjusting the backrest angle by the electrically driven reclining device 4, while the walk-in lever (not shown) is used. A state in which the locking device 10 is released by operation so that the locking device 10 can be rotated forwardly around the hinge connection point (support shaft 3C) with the front part 3A integrally with the rear part 3B of the seat cushion 3. Is switched to. Thus, even if the adjustment operation of the backrest angle of the seat back 2 can be performed electrically, the walk-in operation for switching the seat back 2 to the forward tilted posture can be smoothly performed by using the unlocking type. Can do.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2F Back frame 2P Reinforcement pipe 2H Reinforcement plate 2J Bracket 3 Seat cushion 3A Front side part Aa Side plate part Ab Reinforcement pipe Ac Top plate part Ad Locking part Ae Striker 3B Rear part Ba Locking board 3C Support Axis (hinge connection point)
Ca torsion spring 4 reclining device 4C operation shaft 4D rod 4R central axis 5 electric drive device 5A electric motor 7 buckle 7A connecting shaft 10 locking device 11 base plate 11A receiving port 11B connecting shaft 11C long hole 12 latch (hook member)
12A Upper jaw portion 12B Lower jaw portion 12C Hanging pin 12D Corner portion 12E Support shaft 13 Pole 13A Corner portion 13B Hanging portion 13C Cable hook portion 13D Support shaft 14 Tension spring 15 Cable

Claims (3)

A seat for a vehicle in which a seat back can be adjusted, and a walk-in operation in which the seat back is tilted to a forward leaning position is also possible,
An electrically driven reclining device that connects the seat back to the seat cushion so as to be tiltable and rotatable;
A rotation hinge mechanism that supports the seat back so as to be tilted and rotated about a central axis different from the tilt rotation of the seat back via the reclining device,
While the reclining device is configured to be electrically driven such that the backrest angle of the seat back is changed or stopped according to the electric drive, the rotating hinge mechanism is hinged so that the seat cushions can rotate with respect to each other. and the front part being the configurations divided into a rear part and, at all times after the in Although the hinge rotation of the parts is locked by the locking device to perform the release operation of the lock device seatback said It has an unlocking type rotary hinge structure that can be switched to a state that can be rotated forwardly around the hinge connection point with the front part, integrated with the side part ,
The hinge connection point that is the rotation center axis during the walk-in operation of the seat back is above and behind the connection point of the buckle of the seat belt device connected to the front part, and is the center of the reclining device A vehicle seat characterized in that the vehicle seat is set in a region on the front side and the lower side of the axis . The vehicle seat according to claim 1,
The locking device is configured to be engaged and locked by hooking a hook member provided on the other part to a striker provided on one part of the front part or the rear part, the front part is connected a buckle of the seat belt apparatus, wherein the front part is engaged lock by said said hook member striker at a rear side and the lower side area portion than the connecting point of the buckle A vehicle seat characterized by being configured to be performed. The vehicle seat according to claim 2,
A central axis of tilting rotation of the seat back by the reclining device, a hinge connection point where the front part and the rear part are hinge-connected, and a lock point where the hook member and the striker are engaged and locked are connected. The vehicle seat is characterized in that the triangle formed by the above has an arrangement configuration that approximates a regular triangle.

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