JP2021109623A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat which can restrict an inclination amount of a seat back in a forward inclination direction with configuration excellent in a degree-of-freedom of design.SOLUTION: A vehicle seat, which comprises a seat cushion and a seat back capable of inclining with respect to the seat cushion, includes a control member which has a first contact part capable of contacting a back side contact part provided on the seat back side, and a second contact part capable of contacting a cushion side contact part provided on the seat cushion side at positions separated from each other in a longer direction, and in which the first contact part is movable between a lock position where movement of the back side contact part is regulated to restrict a forward inclination amount of the seat back, and a lock release position where restriction of the forward inclination amount of the seat back is released. The control member is fixed at the lock position when the second contact part contacts the cushion side contact part, and moves to the lock release position from the lock position in such a manner that the first contact part is pressed against the back side contact part by forward inclination motion of the seat back when the second contact part does not contact the cushion side contact part.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle seat in which the seat back can be tilted.

There is a vehicle seat in which the seat back can be tilted with respect to the seat cushion, and the tilt of the seat back is restricted at a predetermined position. For example, in order to facilitate getting on and off the rear seats, a vehicle seat capable of a walk-in operation in which the seat back is tilted forward while sliding the entire seat forward. A type that holds the tilted position (limits the amount of forward tilt) is known.

As an example of such a vehicle seat, Patent Document 1 describes a configuration in which a rotatable stopper arm and a support arm are supported on the seat cushion frame side. When the seat back is tilted forward, the protruding portion (kick portion) provided on the seat back frame side comes into contact with the stopper pin of the stopper arm. The support arm can be rotated to a position where it comes into contact with the stopper pin from the opposite side of the protruding portion and a position where it does not come into contact with the stopper pin. When the support arm is in contact with the stopper pin, the rotation of the stopper arm is restricted. Therefore, when the protruding portion on the seat back frame side is in contact with the stopper pin, the seat back frame is further tilted forward. Be regulated. Since the stopper arm is allowed to rotate when the support arm does not abut on the stopper pin, when the protruding portion on the seat back frame side abuts on the stopper pin, the stopper arm is rotated by pushing by the protruding portion. , The seat back frame tilts further forward.

Japanese Unexamined Patent Publication No. 2013-1177

Generally, the seat back is urged in the forward tilting direction, and when the reclining device is unlocked, the seat back vigorously tilts forward due to the urging force and the weight of the seat back itself. The mechanism that limits the amount of forward tilt of the seat back stops the seat back against the weight and urging force of the seat back.

In the seat reclining device that tiltably supports the seat back with respect to the seat cushion, many parts are concentrated near the center of rotation of the seat back. Therefore, it is required to arrange a mechanism for limiting the amount of forward tilt of the seat back in a space-efficient manner.

The vehicle seat of Patent Document 1 has a cantilever structure in which the stopper arm projects unilaterally from the rotation shaft, and when limiting the forward tilt of the seat back, the protruding portion on the seat back side and the seat cushion side The support arm and the stopper pin are sandwiched from both sides. Therefore, it is necessary to arrange both the stopper arm and the support arm in the vicinity of the rotation center of the seat back, which has a large space constraint, which limits the degree of freedom in design.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat capable of limiting the amount of tilting of the seat back in the forward tilting direction with a configuration having an excellent degree of freedom in design.

According to the present invention, in a vehicle seat provided with a seat cushion and a seat back that can be tilted with respect to the seat cushion, a first contact that enables contact with a back-side contact portion provided on the seat back side. The portion and the second contact portion that enables contact with the cushion side contact portion provided on the seat cushion side are provided at positions separated in the longitudinal direction, and the first contact portion is the back side contact portion. The control member is provided with a control member that can be moved to a locking position that restricts the movement of the seat back to limit the forward tilt amount of the seat back and a locking release position that releases the restriction on the forward tilt amount of the seat back. When the abutting portion of 2 abuts on the cushion side abutting portion, it is fixed at the locking position, and when the second abutting portion does not abut on the cushion side abutting portion, the seat back tilts forward to cause a second. The contact portion of 1 is pressed against the back side contact portion and moves from the locking position to the unlocking position.

The control member can select various operation modes. As one form of the control member, it can be made rotatable about a shaft provided on the seat cushion side. In this case, the shaft is configured to be located between the first contact portion and the second contact portion in the longitudinal direction of the control member.

Further, it is preferable that the distance of the second contact portion from the shaft is larger than the distance of the first contact portion from the shaft.

When the control member moves from the locked position to the unlocked position due to the forward tilting operation of the seat back, even in the most forward tilted position of the seat back, the control member is pressed by the first contact portion from the back side contact portion. Is preferably held in the unlocked position.

According to the vehicle seat of the present invention, a control member capable of contacting the back side contact portion and the cushion side contact portion at different positions in the longitudinal direction is provided between the back side contact portion and the cushion side contact portion. By providing the seat back, it is possible to limit the amount of tilting of the seat back in the forward tilting direction with a configuration having an excellent degree of freedom in design.

It is a side view of a vehicle seat. It is an exploded perspective view of the seat reclining device provided in the vehicle seat. It is the figure which looked at the seat reclining device from the front. It is a side view which shows the seat reclining apparatus in the initial position of a seat back. It is a side view which shows the seat reclining apparatus in a walk-in state. It is a side view which shows the seat reclining apparatus at the stage where a control link starts rotation from a locking position to a locking release position. It is a side view which shows the seat reclining device at the most forward leaning position of a seat back.

Hereinafter, embodiments to which the present invention has been applied will be described with reference to the drawings. The vehicle seat 10 shown in FIG. 1 is supported so as to be movable in the front-rear direction of the vehicle via a seat truck. The left direction in FIG. 1 is the front of the vehicle, and the right direction is the rear of the vehicle. The seat track has a lower rail 11 and an upper rail 12 that can slide in the front-rear direction with respect to the lower rail 11. A pair of left and right lower rails 11 and upper rails 12 are provided, respectively. The upper rail 12 can be brought into a slide lock state in which the front-rear movement with respect to the lower rail 11 is restricted by the slide lock mechanism 13 and a slide allowable state in which the lower rail 11 can be moved back and forth. A well-known slide lock mechanism 13 can be applied, and detailed description thereof will be omitted. The vehicle seat 10 is moved and urged forward by a slide spring (not shown).

A rotation support shaft 14 extending in the left-right direction is fixed in the vicinity of the front end of the lower rail 11. The rotation support shaft 14 is rotatably supported by the rotation support bracket 15 fixed to the floor surface. A floor lock mechanism 16 is provided near the rear end of the lower rail 11. The floor lock mechanism 16 operates in a locked state of holding the striker 17 fixed to the floor surface and an unlocked state of releasing the holding of the striker 17. FIG. 1 shows the locked state of the floor lock mechanism 16. A well-known floor lock mechanism 16 can be applied, and detailed description thereof will be omitted. When the floor lock mechanism 16 is unlocked, the rear portion of the vehicle seat 10 can be lifted and rotated about the rotation support shaft 14.

The vehicle seat 10 has a seat cushion 18 which is a seat surface portion and a seat back 19 which is a backrest portion. The seat back 19 is supported so as to be tiltable in the front-rear direction with respect to the vicinity of the rear end of the seat cushion 18 via the seat reclining device 20.

In the reclining region R shown in FIG. 1, the seat reclining device 20 operates the reclining lock mechanism 21 (see FIGS. 2 and 3) described later to hold the seat back 19 at an arbitrary angle position (reclining lock). It is possible. In the reclining region R, the position where the reclining angle of the seat back 19 is the smallest (standing) is the initial position 19A, and the position where the reclining angle is the largest (backward tilting) is the final tilting position.

The seat reclining device 20 urges the seat back 19 in the forward tilting direction (counterclockwise direction in FIG. 1) by a forward tilting spring (not shown), and when the reclining lock mechanism 21 is unlocked, the seat is seated. The back 19 falls forward from the initial position 19A. The tilt region of the seat back 19 in front of the initial position 19A is a forward tilt region U in which the angle of the seat back 19 is not maintained by the reclining lock mechanism 21 (reclining lock is not performed).

A release handle 22 and a walk-in operation lever 23 are provided on the side of the vehicle seat 10. With the seat back 19 in the reclining area R from the last tilt position to the initial position 19A, the reclining lock is released by each operation of the release handle 22 and the walk-in operation lever 23, and the seat back 19 is moved to the forward tilt area U. Can be defeated. When the release handle 22 is operated, the seat back 19 can be tilted forward to the most forward tilted position 19C in the forward tilted region U where the amount of forward tilting is the largest. When the walk-in operation lever 23 is operated, the seat back 19 can be tilted forward to the forward tilt position 19B in the middle of the forward tilt region U. The operation of the seat back 19 to each of these positions will be described in detail later.

The configuration and operation of the seat reclining device 20 will be described with reference to FIGS. 2 and 2. One seat reclining device 20 is provided on each side of the vehicle seat 10 in the width direction, and the seat reclining device 20 operates in conjunction with each other on the left and right sides. 2 to 7 show the seat reclining device 20 on one side.

As shown in FIG. 2, the seat reclining device 20 has a lower bracket 25 fixedly supported on the seat cushion 18 side and an upper bracket 26 fixedly supported on the seat back 19 side. The lower bracket 25 is fixed near the rear end of the seat cushion frame 27 (see FIG. 1) that constitutes the skeleton of the seat cushion 18. The lower bracket 25 and the seat cushion frame 27 may be integrally formed. A reclining lock mechanism 21 is provided between the lower bracket 25 and the upper bracket 26 (see FIG. 3).

The upper bracket 26 is tilted forward with respect to the lower bracket 25 by a forward tilting spring (not shown) installed between the upper bracket 26 and the lower bracket 25 (forward tilt position 19B and forward tilt position 19C of the seat back 19). Is being urged towards.

The reclining lock mechanism 21 is a round type reclining lock mechanism, and since its configuration is well known, it will be briefly described. A base plate and a ratchet plate each forming a disk shape are combined so as to be relatively rotatable, the base plate is fixed to the fastening portion 25a of the lower bracket 25, and the ratchet plate is fixed to the fastening portion 26a of the upper bracket 26. The center of relative rotation between the base plate and the ratchet plate is the center of rotation of the seat back 19.

Between the base plate and the ratchet plate in the reclining lock mechanism 21, a plurality of lock members (not shown) that can move in the radial direction around the rotation center of the seat back 19 and rotate around the rotation center of the seat back 19. A lock control member (not shown) is arranged. Each of the plurality of lock members is restricted from moving in the rotational direction with respect to the base plate. The lock control member rotates integrally with a hinge pin (not shown) inserted into a hole formed in the center of the base plate and the ratchet plate. The radial position of each lock member changes due to the change in the position of the lock control member in the rotational direction. When each lock member moves in the outer diameter direction, the outer teeth formed on each lock member mesh with the inner teeth formed on the ratchet plate, and the relative rotation between the base plate and the ratchet plate is restricted.

The lock control member is urged in the locking direction by engaging the outer teeth of the lock member with the inner teeth of the ratchet plate by a lock urging spring (not shown) provided in the reclining lock mechanism 21. Inside the reclining lock mechanism 21, meshing regulating means (not shown) for regulating the meshing of the outer teeth of the lock member and the inner teeth of the ratchet plate at a predetermined rotation phase of the base plate and the ratchet plate is provided. In the forward tilting region U of the seat back 19, the reclining lock mechanism 21 is not locked by the action of the meshing regulating means. In the reclining region R of the seat back 19, the reclining lock mechanism 21 maintains a locked state that regulates the tilt of the upper bracket 26 with respect to the lower bracket 25 by the urging force of the lock urging spring.

A protrusion 28 forming a back-side contact portion is formed in the lower portion of the upper bracket 26. As the seat back 19 tilts, the position of the protrusion 28 changes around the center of rotation of the seat back 19.

An arc-shaped guide hole 29 is formed in the lower bracket 25. A regulation pin 30 forming a cushion-side contact portion is inserted into the guide hole 29. The regulation pin 30 is provided on a linking lever (not shown) pivotally supported by the lower bracket 25, and the regulation pin 30 moves in the guide hole 29 according to the rotation of the linking lever. The guide hole 29 extends substantially in the vertical direction and has a curved shape that changes its position in front of the seat from the upper end to the lower end.

The position of the regulation pin 30 on the upper end side of the guide hole 29 is defined as the regulation position (FIG. 5). The position of the regulation pin 30 on the lower end side in the guide hole 29 (FIGS. 4, 6, and 7) is set as the regulation release position. Functionally, the state where the control link 32 (second contact surface 36a), which will be described later, is located on the movement locus of the control link 32 (second contact surface 36a) is the regulation position of the regulation pin 30, and the control link 32 (second contact surface 36a). The state of retracting from the movement locus is the regulation release position of the regulation pin 30, and the regulation position and the regulation release position of the regulation pin 30 do not necessarily correspond to the end of the guide hole 29. For example, the regulation release position of the regulation pin 30 may be set in the middle of the guide hole 29.

The regulation pin 30 approaches the upper bracket 26 as it is located upward in the guide hole 29. However, as shown in FIG. 5, even when the regulation pin 30 is in the uppermost regulation position, the protrusion 28 and the regulation pin 30 do not advance on the movement locus of the protrusion 28 of the upper bracket 26, and the protrusion 28 and the regulation pin 30 are directly connected. Not in contact with. In other words, the regulation pin 30 is not located on the extension of the moving direction of the protrusion 28 at any position in the operating range, but is located below the moving locus of the protrusion 28.

A control link 32 is provided as a control member interposed between the protrusion 28 and the regulation pin 30. The link shaft 34 supported by the lower bracket 25 is inserted into the shaft hole 33 provided in the control link 32, and the control link 32 is rotatably supported around the link shaft 34. The control link 32 has a first arm 35 and a second arm 36 extending in different directions (generally opposite directions) from the formation position of the shaft hole 33. The direction in which the first arm 35 and the second arm 36 extend is the longitudinal direction of the control link 32. A positioning protrusion 37 is provided so as to project from the second arm 36.

A first contact surface 35a is formed on the first arm 35, and a second contact surface 36a is formed on the second arm 36. The first contact surface 35a and the second contact surface 36a are provided at positions separated from each other in the longitudinal direction of the control link 32. More specifically, the first contact surface 35a is located on the side surface near the tip of the first arm 35, the second contact surface 36a is located on the side surface near the tip of the second arm 36, and the longitudinal direction of the control link 32. The link shaft 34 is located between the first contact surface 35a and the second contact surface 36a.

The control link 32 moves to the locking position shown in FIGS. 4 to 6 and the locking release position shown in FIG. 7 by rotation. At the locked position of the control link 32, the first arm 35 and the second arm 36 extend substantially in the vertical direction. At this time, the first contact surface 35a and the second contact surface 36a face each other toward the front side of the seat, and the first contact surface 35a is located in front of the second contact surface 36a. More specifically, the first contact surface 35a is located above and in front of the link shaft 34, and the second contact surface 36a is located below the link shaft 34. At the unlocked position of the control link 32, the first arm 35 tilts so as to increase the amount of protrusion toward the rear side of the seat, and the second arm 36 tilts so as to increase the amount of protrusion toward the front side of the seat.

A cable bracket 38 is attached to the control link 32. The cable bracket 38 has a shaft hole 39 into which the link shaft 34 is inserted, a positioning hole 40 into which the positioning protrusion 37 is inserted, and a cable connection hole 41. The position of the cable bracket 38 with respect to the control link 32 is determined by fitting the positioning protrusion 37 and the positioning hole 40. Then, the control link 32 and the cable bracket 38 rotate integrally around the link shaft 34.

The cable 42 is connected to the cable connection hole 41 of the cable bracket 38. The cable 42 is connected to the floor lock mechanism 16 (FIG. 1), and the floor lock mechanism 16 can be operated from the locked state to the unlocked state by pulling the cable 42.

In order to increase the rigidity of the control link 32, the thickness of the control link 32 is increased. On the other hand, if the thickness of the control link 32 is large, it becomes difficult to directly attach the cable 42 to the control link 32. By providing the cable bracket 38, which is a member separate from the control link 32, the above problem can be solved and the rigidity of the control link 32 can be ensured and the cable 42 can be attached easily. It should be noted that the control link 32 and the cable bracket 38 may not be separated as in the present embodiment, but a configuration in which the cable is directly connected to the control member corresponding to the control link 32 may be selected.

Although not shown, the seat reclining device 20 includes a control mechanism that transmits the operations of the release handle 22 and the walk-in operation lever 23 to perform a predetermined operation. The control mechanism is composed of a plurality of levers assembled to the lower bracket 25, cables and rods for transmitting an operating force to these levers, and the like.

FIG. 4 shows the seat reclining device 20 at the initial position 19A of the seat back 19. When the seat back 19 is in the reclining region R including the initial position 19A, the regulation pin 30 is held at the restriction release position near the lower end in the guide hole 29.

When the release handle 22 is operated in the locked state of the reclining lock mechanism 21, the rotation is transmitted to the lock control member of the reclining lock mechanism 21 via the control mechanism, and the lock member disengages the outer teeth from the inner teeth of the ratchet plate. Moved in the unlock direction. Then, the upper bracket 26 can be tilted with respect to the lower bracket 25 in an unlocked state. The reclining lock mechanism 21 can be unlocked, and the seat back 19 can be tilted in the reclining region R to select an arbitrary angular position. In the reclining region R, when the angle of the seat back 19 is determined, the reclining lock mechanism 21 returns to the locked state, and the seat back 19 is maintained at the angle.

When the reclining lock mechanism 21 is unlocked, if the seat back 19 is not held by an external force such as human power, the seat back 19 tilts forward from the reclining region R due to the urging force of the forward tilting spring. Tilt towards region U. The amount of tilt of the seat back 19 to the forward tilt region U differs depending on whether the release handle 22 is operated or the walk-in operation lever 23 is operated.

When the walk-in operation lever 23 is operated in the locked state of the reclining lock mechanism 21, the reclining lock mechanism 21 is unlocked via the control mechanism in the same manner as when the release handle 22 is operated. Further, the operating force of the walk-in operation lever 23 is transmitted to the slide lock release member (not shown) which is a component of the slide lock mechanism 13 via the control mechanism, and the slide lock release operation by the slide lock release member is performed. Will be done. As a result, the upper rail 12 becomes a slide allowable state in which the upper rail 12 can slide with respect to the lower rail 11. Further, the operating force of the walk-in operation lever 23 is transmitted to the regulation pin 30 via the control mechanism, and the regulation pin 30 moves from the regulation release position (FIG. 4) to the regulation position (FIG. 5).

As shown in FIG. 5, when the regulation pin 30 is in the regulation position, the second contact surface 36a of the second arm 36 comes into contact with the regulation pin 30, so that the control link 32 moves to the unlocking position (FIG. 7). The rotation of the is regulated and fixed at the locking position. In this state, when the seat back 19 is tilted forward by a predetermined amount in the forward tilting region U and the protrusion 28 of the upper bracket 26 comes into contact with the first contact surface 35a of the first arm 35, the control link 32 is locked. Further movement of the protrusion 28 is restricted by the control link 32, and the upper bracket 26 stops at the angle shown in FIG. The position of the seat back 19 at this time is the forward tilt position 19B.

Therefore, when the walk-in operation lever 23 is operated, if the seat back 19 is not held by an external force such as human power, the seat back 19 slides while being tilted to the forward tilt position 19B by the urging force of the forward tilting spring. The slide lock by the lock mechanism 13 is released, which is a so-called walk-in state. FIG. 5 shows the seat reclining device 20 in the walk-in state.

When the reclining lock mechanism 21 is unlocked by operating the release handle 22, the regulation pin 30 maintains the regulation release position (FIG. 4), and the control link 32 is allowed to rotate to the unlock position. There is. Therefore, as shown in FIG. 6, the seat back 19 is further tilted forward from the state where the protrusion 28 of the upper bracket 26 is in contact with the first contact surface 35a of the first arm 35 (forward tilt position 19B of the seat back 19). It is possible to work.

When the seat back 19 tilts from the forward tilt position 19B toward the most forward tilt position 19C, the protrusion 28 of the upper bracket 26 presses the first contact surface 35a of the first arm 35, and the control link 32 is in the unlocked position. Rotate toward. FIG. 6 shows a state in which the control link 32 starts rotating to the unlocked position. Since the regulation pin 30 is not located on the movement locus of the second arm 36 of the control link 32, the second arm 36 is in a state of swinging with respect to the regulation pin 30, and the control link 32 is rotated to the unlocked position. Is not regulated.

FIG. 7 shows the seat reclining device 20 at the most forward tilted position 19C of the seat back 19. The control link 32 completes the rotation to the unlocked position when the seat back 19 reaches the most forward tilted position 19C or at a slightly time-consuming stage when the seat back 19 reaches the most forward tilted position 19C. As the control link 32 rotates from the locking position (FIG. 6) to the unlocking position (FIG. 7), the cable 42 connected to the cable bracket 38 is towed, and the floor lock mechanism 16 is unlocked from the locked state. Switch to the locked state. As shown in FIG. 7, a state in which the protrusion 28 of the upper bracket 26 presses the first arm 35 (a state in which the control link 32 is held in the unlocked position) with the seat back 19 reaching the most forward tilted position 19C. ) Is continued, and the floor lock mechanism 16 maintains the unlocked state.

Therefore, when the seat back 19 is tilted to the most forward tilted position 19C, the floor lock mechanism 16 releases the holding of the striker 17, and the rear portion of the vehicle seat 10 can be flipped up around the rotation support shaft 14.

The rotation of the control link 32 from the locked position to the unlocked position may be detected by a detecting means (not shown). By detecting the rotation of the control link 32, for example, a state in which the seat back 19 is tilted to the most forward tilted position 19C (so-called falldown state) can be detected.

In addition to the release handle 22 and the walk-in operation lever 23, a falldown operation member may be provided. In this case, when the operation member for falldown is operated in the walk-in state shown in FIG. 5, the regulation pin 30 moves from the regulation position to the regulation release position, and the seat back 19 can be tilted to the most forward tilt position 19C. ..

Alternatively, the regulation pin 30 may be configured to move to the regulation release position in response to the operation of the release handle 22. In this case, when the release handle 22 is operated in the walk-in state shown in FIG. 5, the regulation pin 30 moves from the regulation position to the regulation release position, and the seat back 19 can be tilted to the most forward tilt position 19C.

The seat reclining device 20 has a complicated structure with a high component arrangement density near the center of rotation of the seat back 19 in which the reclining lock mechanism 21 is installed, and has a small space margin. For example, although omitted in each drawing of the present embodiment, the component of the control mechanism that transmits the respective operations of the release handle 22 and the walk-in operation lever 23 to perform a predetermined operation is the reclining lock mechanism 21. It is provided around.

Here, in the seat reclining device 20 of the present embodiment, the protrusion 28 provided on the seat back 19 side (upper bracket 26) and the regulation pin 30 provided on the seat cushion 18 side (lower bracket 25) are interposed. A first contact surface 35a that comes into contact with the protrusion 28 and a first contact surface 35a that comes into contact with the regulation pin 30 at different positions in the longitudinal direction of the control link 32 (at positions separated from each other in the longitudinal direction). Two contact surfaces 36a are provided. That is, the regulation pin 30 is arranged at a position far away from the center of rotation of the seat back 19 to receive a load for limiting the amount of forward tilt of the seat back 19. As a result, the degree of freedom in designing the mechanism for limiting the forward tilt amount of the seat back 19 is improved, and a configuration excellent in load bearing capacity and space efficiency can be realized.

For example, as a comparative example, the control link 32 is not provided with the second arm 36, and instead, the side surface of the first arm 35 on the opposite side of the first contact surface 35a is regulated on the seat cushion side such as the regulation pin 30. Assume a configuration in which the means is brought into contact with the means. The regulating means are a regulation position that abuts on the first arm 35 to limit the forward tilt amount of the seat back 19, and a regulation release position that does not limit the forward tilt amount of the seat back 19 without contacting the first arm 35. It is supported so that it can be moved to. In this comparative example, the load input from the protrusion 28 is directly transmitted from the first arm 35 to the regulating means on the seat cushion side. Further, configuring the regulatory means capable of moving to the regulated position and the regulated release position while having sufficient strength to withstand the load is to form the seat back 19 in which the arrangement density of parts is high and the space is limited. Difficult near the center of rotation.

On the other hand, in the seat reclining device 20 of the present embodiment, the second arm 36 (second contact surface 36a) of the control link 32 and the regulation pin 30 are located in a region separated below where the space restriction is small as described above. Places the points where they come into contact with each other. Therefore, the shape and strength of the second arm 36 and the regulation pin 30 can be set with a high degree of freedom, and the load bearing capacity when limiting the forward tilt amount of the seat back 19 can be reasonably increased.

The control link 32, which is a control member interposed between the protrusion 28 and the regulation pin 30, is a rotating member that rotates about the link shaft 34, and has a first contact surface 35a that abuts on the protrusion 28. The second contact surfaces 36a that come into contact with the regulation pin 30 are located on both sides of the link shaft 34 in the longitudinal direction of the control link 32. Then, at the locking positions of the control link 32 (FIGS. 4, 5, and 6), the first contact surface 35a and the second contact surface 36a both face the front of the vehicle seat 10 and make the first contact. The protrusion 28 is located in front of the surface 35a, and the regulation pin 30 is located in front of the second contact surface 36a. When limiting the amount of forward tilt of the seat back 19, the backward pressing load received by the first contact surface 35a is converted into a forward load and transmitted from the second contact surface 36a to the regulation pin 30. do. According to this configuration, the components required for the control link 32 and the area in front of the control link 32 can be integrated without providing a configuration for receiving a load on the rear side of the control link 32, so that the rear part of the seat reclining device 20 can be integrated. This is especially useful when space is constrained.

Further, the control link 32, which is a rotating member, sets the distance from the link shaft 34 to the first contact surface 35a (strictly speaking, the position where the protrusion 28 abuts on the first contact surface 35a) as DA and the link shaft. Assuming that the distance from 34 to the second contact surface 36a (strictly speaking, the position where the regulation pin 30 abuts on the second contact surface 36a) is set to DB, the larger the DB with respect to DA, the more the control link 32 The load input to the regulation pin 30 is reduced per unit rotation angle. Therefore, it is more preferable that the relationship between DA and DB is at least DA ≦ DB and DA <DB. As shown in FIGS. 4 to 6, the change of extending the second arm 36 of the control link 32 downward (in the direction away from the center of rotation of the seat back 19) to increase the ratio of the DB is less likely to be restricted by space. Cheap. In this way, when the control link 32, which is a rotating member, is used as the control member, the load reduction effect can be achieved by setting the positional relationship between the two contact portions (the first contact surface 35a and the second contact surface 36a). Can be obtained.

In addition, unlike the control link 32, it is also possible to use a control member that moves in a form other than rotation. For example, instead of the control link 32, a control member that can move linearly in the front-rear direction of the seat may be installed with the longitudinal direction directed in the vertical direction of the seat. In this control member, the front side surface near the upper end serves as the first contact portion that contacts the back side contact portion (corresponding to the protrusion 28) on the seat back 19 side, and the rearward side surface near the lower end serves as a first contact portion. , It becomes the second contact portion that contacts the cushion side contact portion (corresponding to the regulation pin 30) on the seat cushion 18 side. The contact between the second contact portion and the cushion side contact portion restricts the control member from moving backward. Then, when the seat back 19 tilts forward and the back side contact portion abuts on the first contact portion, the seat back 19 tilts further forward via the control member whose movement to the rear is restricted. Operation is restricted. When the cushion-side contact portion separates downward from the position where it contacts the second contact portion, the back-side contact portion presses the first contact portion, and the control member moves rearward while the seat back. It becomes a state that allows the further forward tilting motion of 19.

It is also possible to realize a control member that linearly moves in the front-rear direction of the seat as a modified example in which the support structure of the control link 32 is changed. For example, the lower bracket 25 is formed with an elongated hole extending in the front-rear direction of the seat. A non-circular guide protrusion that is inserted into the elongated hole in a state where rotation is restricted is provided on the control link 32 side instead of the link shaft 34. Then, as the guide protrusion moves along the elongated hole, the control link 32 operates linearly in the front-rear direction of the seat while maintaining the angles shown in FIGS. 4 to 6. In this modification, the cushion-side contact portion (corresponding to the regulation pin 30) is not the front surface (second contact surface 36a) of the second arm 36 of the control link 32 but the rear surface of the second arm 36. It is preferable to restrict the movement of the control link 32 to the rear by contacting the control link 32.

As described above, the present invention can be applied without limiting the form of movement of the control member. Then, on the back side contact portion (corresponding to the protrusion 28) provided on the seat back 19 side, the first contact portion (corresponding to the first contact surface 35a) and the seat cushion 18 side. The length of the control member (corresponding to the control link 32) with the second contacting portion (corresponding to the second contact surface 36a) capable of contacting the provided cushion-side contacting portion (corresponding to the regulation pin 30). It is established if the requirement that the cushions are provided at positions separated from each other in the direction is satisfied.

In the embodiment in which the control member is a rotating member (control link 32), the first contact portion (first contact surface 35a) and the second contact portion (first contact surface 35a) come into contact with each other in the longitudinal direction of the control member, as in the above embodiment. The shaft (link shaft 34) of the control member is configured to be located between the portions (second contact surface 36a).

Further, as in the above embodiment, the operation of the control member (control link 32) from the locking position (FIGS. 4 to 6) to the unlocking position (FIG. 7) is utilized to make the floor lock mechanism 16 like the floor lock mechanism 16. By performing the unlocking operation of the locking mechanism and detecting the position of the seat back 19 in the forward tilted state, the control member can be provided with multiple functions. As a result, the seat reclining device can be made highly functional with a small number of parts.

The back-side contact portion provided on the seat back side and the cushion-side contact portion provided on the seat cushion side are not limited to the protrusion 28 and the regulation pin 30 of the above embodiment. For example, instead of the regulation pin 30 that moves along the guide hole 29 in an arcuate locus, a back-side contact portion made of a member that moves linearly may be used. Further, instead of the cylindrical shape such as the regulation pin 30, a prism or other shape of the back side contact portion may be used.

Further, in the above embodiment, the second contact surface 36a, which is the side surface of the second arm 36, comes into contact with the regulation pin 30 to fix the control link 32 at the locking position. Unlike this configuration, a groove is formed in the second arm 36 of the control link 32, and the control link 32 is fixed at the locking position by the regulation pin entering the inside of the groove. May be good. When the regulation pin is separated from the groove, the control link 32 can be moved from the locking position to the unlocking position.

The configuration and shape of the control member are not limited to the above embodiment. For example, the control link 32 has a shape in which the first arm 35 and the second arm 36 are not aligned in a straight line but are bent in the middle of the longitudinal direction. When the control member is a rotating member, unlike the control link 32 having such a shape, a linear (I-shaped) control member having no bending in the middle or a V-shape with a large degree of bending is used. Or an L-shaped control member, a curved control member, or the like may be used.

Further, even when a control member of a type that moves linearly instead of rotating is used, the configuration and shape of the control member can be arbitrarily selected. For example, in the above-described modified example, a configuration has been described in which only the support structure of the control link 32 is changed to linearly move the control link 32 in the front-rear direction of the seat. Unlike this, a linear (I-shaped) control member extending in the vertical direction of the seat, a control member having a bent shape different from that of the control link 32, a curved control member, and the like are linearly arranged. You may move it.

In the above embodiment, the protrusion 28 of the upper bracket 26 is in contact (pressing) with the first contact surface 35a of the first arm 35 at the most forward tilted position 19C of the seat back 19, but the seat back is tilted forward. At the position, the contact between the back side contact portion (corresponding to the protrusion 28) and the first contact portion (corresponding to the first contact surface 35a) may be released.

Further, the embodiment of the present invention is not limited to the above embodiment and its modifications, and may be variously modified, replaced, or modified without departing from the spirit of the technical idea of the present invention. Furthermore, if the technical idea of the present invention can be realized in another way by the advancement of technology or another technology derived from it, it may be carried out by using that method. Therefore, the scope of claims covers all embodiments that may be included within the scope of the technical idea of the present invention.

10: Vehicle seat 16: Floor lock mechanism 18: Seat cushion 19: Seat back 19A: Initial position 19B: Forward tilt position 19C: Frontmost tilt position 20: Seat reclining device 21: Reclining lock mechanism 22: Release handle 23: Walk-in Operation lever 25: Lower bracket 26: Upper bracket 28: Projection (back side contact)
29: Guide hole 30: Regulation pin (cushion side contact part)
32: Control link (control member)
34: Link shaft (seat cushion side shaft)
35: First arm 35a: First contact surface (first contact portion)
36: Second arm 36a: Second contact surface (second contact portion)
38: Cable bracket 42: Cable

Claims (4)

In a vehicle seat provided with a seat cushion and a seat back that can be tilted with respect to the seat cushion.
A first contact portion capable of contacting the back side contact portion provided on the seat back side and a second contact portion capable of contacting the cushion side contact portion provided on the seat cushion side. And the seat back are separated from each other in the longitudinal direction, and the first contact portion regulates the movement of the back side contact portion to limit the forward tilt amount of the seat back, and the seat back. Equipped with a control member that can be moved to the unlocked position that releases the restriction on the amount of forward tilting
The control member
When the second contact portion comes into contact with the cushion side contact portion, it is fixed at the locking position.
When the second abutting portion does not abut on the cushion side abutting portion, the first abutting portion is pressed against the back side abutting portion by the forward tilting operation of the seat back, and the engaging portion is engaged. A vehicle seat characterized by moving from a stop position to the unlocked position. The control member is rotatable about a shaft provided on the seat cushion side, and the shaft is located between the first contact portion and the second contact portion in the longitudinal direction of the control member. The vehicle seat according to claim 1, wherein the seat is located. The vehicle seat according to claim 2, wherein the distance of the second contact portion from the shaft is larger than the distance of the first contact portion from the shaft. Claims 1 to 3, wherein the control member is held at the unlocked position by pressing the first contact portion from the back side contact portion at the most forward tilted position of the seat back. The vehicle seat according to any one of the above.

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