JP6488223B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of switching a state of a seat body by operating a plurality of links.

  A vehicle seat capable of switching the state of the seat body is already known. An example of such a vehicle seat includes a plurality of moving members such as a rotation link and the state of the seat body can be switched by operating each of the plurality of moving members (for example, patents). Reference 1).

  The vehicle seat described in Patent Document 1 is a vehicle seat provided with an ottoman that can be stored and deployed. A link mechanism comprising a plurality of links is provided between the ottoman and the seat cushion. The link mechanism includes a fixed link, a front link, a rear link, an upper link, and a drive unit. Furthermore, the drive unit has a motor and a feed screw that moves in the axial direction by the driving force of the motor, and connects the fixed link and the upper link.

  In the vehicle seat of Patent Document 1 configured as described above, each link moves when the motor operates and the feed screw moves in the axial direction. As a result, the state of the ottoman is switched by the movement operation of each link, and specifically, the state is switched between the storage state and the use state (the state where the occupant's lower leg is supported).

JP 2013-244936 A

  By the way, in the vehicle seat described in Patent Document 1, a feed screw is used as a member that moves straight in order to operate a plurality of links. However, as a member corresponding to the feed screw, a tip portion is a link. Alternatively, a member (advancing / retracting member) that moves forward and backward while moving straight while being fixed to a member connected to the link may be used. In such a case, the advancing / retreating member moves forward / backward so that the driving force of the advancing / retreating member is transmitted to each link, and as a result, each link moves.

  However, in the above configuration, there is a possibility that rattling occurs between the distal end portion of the advance / retreat member and the member to which the distal end portion is fixed. In particular, when the rectilinear direction of the advancing / retreating member is inclined with respect to the horizontal direction or the vertical direction, the leading end portion of the advancing / retreating member easily swings, and the above-described rattling occurs more significantly. On the other hand, the degree of rattling (the degree of deflection) when the above-described rattling occurs depends on the movable range of the tip of the advancing / retreating member, and the degree of rattling tends to increase as the movable range increases.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to reduce the degree of backlash generated at the tip by reducing the movable range of the tip of the advance / retreat member. The object is to provide a vehicle seat capable of satisfying the requirements.

  According to the vehicle seat of the present invention, the subject is a plurality of links that move to switch the state of the seat body, a forward and backward member that moves forward and backward while moving straight to move each of the plurality of links, A distal end portion of the advancing / retreating member, and a driving force receiving portion that receives the driving force of the advancing / retreating member and transmits the driving force to the plurality of links, and the plurality of links are in a state of being relatively rotatable Two intersecting links that intersect each other, an auxiliary link that is assembled to one of the two intersecting links via a rotation shaft, and swings when the driving force is transmitted; A turning locus when a fixed portion fixed to the driving force receiving portion of the tip portion of the advance / retreat member turns around a turning fulcrum is defined as a first locus, and the auxiliary link Part of the pivot shaft When the second locus is a turning locus when turning about the center, the first locus and the second locus are projected on a virtual plane orthogonal to the axial direction of the turning shaft. It is solved by both crossing each other.

  In the vehicle seat of the present invention configured as described above, two cross links that intersect each other in a plurality of links, and an auxiliary that is assembled to one of the cross links via a rotation shaft. And a link. Here, of the distal end portion of the advancing / retreating member, the rotation locus when the fixed portion fixed to the driving force receiving portion rotates around the rotation fulcrum is defined as the first locus. Further, a turning locus when a part of the auxiliary link is turned around the turning axis is defined as a second locus. And when both the 1st locus | trajectory and the 2nd locus | trajectory are projected on the virtual plane orthogonal to the axial direction of a rotating shaft, the said both cross | intersect each other. With such a configuration, the region (movable range) in which the tip of the advancing / retreating member can move is limited to the range where the second trajectory crosses the first trajectory. As a result, the movable range of the distal end portion of the advance / retreat member can be further reduced, thereby reducing the degree of backlash generated at the distal end portion of the advance / retreat member.

Further, in the above vehicle seat, the plurality of links move to switch the state of the ottoman that supports the lower leg of the seated person between the use state and the storage state in the seat body, and the vehicle It is good to arrange | position one set at a time in the state which provided the space | interval in the width direction of the sheet for use.
If it is said structure, in the vehicle seat which can switch an ottoman's state by operation | movement of a some link, it will become possible to reduce the degree of rattling which arises in the front-end | tip part of the advancing / retreating member which carries out a rectilinear operation.

Further, in the above vehicle seat, the plurality of links are assembled to the one of the cross links, and when the Ottoman state is in the use state, the other of the two cross links is along the other cross link. The first intersection link facing the other intersection link and the other intersection link are assembled to the other intersection link, and the one intersection is along the one intersection link when the Ottoman is in the use state. A second opposing link facing the link; a first sublink that is connected to the driving force receiving portion and swings when the driving force is transmitted; and adjacent to the first sublink in the width direction. And a second sub-link as the auxiliary link that swings integrally with the first sub-link.
In the above configuration, four links and two sublinks forming a pantograph mechanism are included in the plurality of links. By providing two sub-links, it is possible to reduce the movable range of the distal end portion of the advance / retreat member and reduce the degree of backlash generated at the distal end portion of the advance / retreat member.

In the above vehicle seat, the first sub link is assembled to the second opposing link via a second rotation shaft, and the first sub link is fixed in the width direction among the first sub links. When the rotation locus when the portion adjacent to the part is rotated about the second rotation axis is the third locus, the first locus, the second locus, and the first locus on the virtual plane. When three trajectories are projected, the first trajectory and the third trajectory may partially overlap, and the second trajectory may intersect a range of the first trajectory that overlaps the third trajectory.
In the above configuration, the rotation trajectory when the portion adjacent to the distal end portion (strictly, the fixed portion) of the advance / retreat member of the first sub-link rotates about the second rotation axis is the third sub-link. When a trajectory is used, the first trajectory and the third trajectory projected on the virtual plane partially overlap. The second locus projected on the virtual plane intersects the range where the first locus and the third locus overlap. As a result, the movable range of the distal end portion of the advance / retreat member can be reduced more effectively.

In the above vehicle seat, the first sub-link provided in the plurality of links arranged on one end side in the width direction and the plurality of links arranged on the other end side in the width direction are provided. It is good to further have a connecting member which connects between the 1st sublink, and the above-mentioned driving force reception part is good to be fixed on the peripheral face of the above-mentioned connecting member.
In said structure, the driving force reception part is being fixed on the outer peripheral surface of a connection member. That is, the driving force receiving unit is arranged in a space between the plurality of links arranged on one end side in the width direction and the plurality of links arranged on the other end side in the width direction. With such a configuration, it is possible to save the space for arranging the driving force receiving unit.

The vehicle seat further includes a motor for advancing and retracting the advance / retreat member, and the advance / retreat member is a rod-shaped member, and when moving forward, moves straight ahead diagonally upward. When retreating, it is better to go straight diagonally downward.
In the above configuration, the advancing / retreating member is a rod-shaped member, and is driven by a motor to advance / retreat in an oblique direction. In such a configuration, the tip portion of the advancing / retreating member is more likely to swing, and thus the rattle is more likely to occur at the tip portion. Therefore, in the above configuration, by providing the auxiliary link, the effect of the present invention in which the movable range of the distal end portion of the advance / retreat member is reduced to reduce the backlash becomes more prominent.

In the above vehicle seat, when the ottoman is in the used state, the driving force receiving portion may be positioned above the motor.
In the above configuration, when the ottoman is in the use state, the driving force receiving unit is positioned above the motor. That is, when the state of the ottoman is in use, the distal end portion of the advance / retreat member is located above the pivot point of the advance / retreat member. For this reason, when the advancing / retreating member moves back and forth to move the plurality of links in order to switch the ottoman state from the stored state to the use state, the distal end portion of the advancing / retreating member is more likely to swing, and more looseness occurs at the distal end portion. It becomes easy. Therefore, in the above configuration, by providing the auxiliary link, the effect of the present invention in which the movable range of the distal end portion of the advancing / retreating member is reduced and the backlash is reduced can be more remarkably exhibited.

Further, in the above vehicle seat, the one end side mounting bracket provided to attach the plurality of links arranged on one end side in the width direction to the seat cushion, and the other end side in the width direction. The other end side mounting bracket provided to attach the plurality of links to the seat cushion, and the motor disposed between the one end side mounting bracket and the other end side mounting bracket in the width direction. A fixing bracket, and the motor may be fixed to the motor fixing bracket.
In the above configuration, the motor fixing bracket is provided between the one end mounting bracket and the other end mounting bracket, and the motor is fixed to the motor fixing bracket. Thereby, it becomes possible to fix (arrange) the motor using the space between the plurality of links provided on one end side in the width direction and the plurality of links provided on the other end side in the width direction, Accordingly, it is possible to save the space for arranging the motor.

According to the present invention, the movable range of the distal end portion of the advance / retreat member can be further reduced, and the degree of backlash generated at the distal end portion of the advance / retreat member can be reduced.
In addition, according to the present invention, in the configuration in which the ottoman state is switched by the operation of a plurality of links, it is possible to reduce the degree of backlash that occurs at the tip of the advancing / retreating member that moves straight.
In addition, according to the present invention, by providing two sub links, the movable range of the distal end portion of the advance / retreat member can be further reduced, and the degree of backlash generated at the distal end portion of the advance / retreat member can be effectively reduced. Become.
In addition, according to the present invention, the movable range of the distal end portion of the advance / retreat member can be reduced more effectively.
Further, according to the present invention, it is possible to save the space for arranging the driving force receiving unit.
In addition, according to the present invention, since the advancing / retreating member made of a rod-shaped member is driven by a motor to advance / retreat in an oblique direction, the effects of the present invention can be exhibited more significantly.
Further, according to the present invention, when the advancing / retreating member moves back and forth to move the plurality of links in order to switch the ottoman state from the stored state to the use state, rattling is more likely to occur at the distal end portion of the advancing / retreating member. For this reason, the effect of this invention comes to be exhibited more notably.
Further, according to the present invention, it is possible to save the space for arranging the motor.

1 is an overall view of a vehicle seat according to an embodiment of the present invention. It is explanatory drawing regarding switching of the state of an ottoman. It is a figure which shows an ottoman and a link group. It is a figure which shows an ottoman, a link group, and a link cover. It is a side view which shows a link group and a link cover when the state of an ottoman is in a use state. It is a side view which shows a link group and a link cover when the state of an ottoman is in a stowed state. It is a figure when a link group is seen from the upper part. It is the figure which showed the operation example of the link group, and is a figure when it sees from the arrow X direction in FIG. It is the figure which showed the operation example of the link group, and is a figure which shows the AA cross section in FIG. It is the figure which showed the operation example of the link group, and is a figure which shows the BB cross section in FIG. It is explanatory drawing regarding the movable range of the front-end | tip part of the advance / retreat member which concerns on one Embodiment of this invention. It is explanatory drawing regarding the movable range of the front-end | tip part of the advance / retreat member which concerns on a comparative example.

  Hereinafter, an embodiment (this embodiment) of the present invention will be described. The embodiment described below is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents.

  Hereinafter, the vehicle seat S will be described as an example of the vehicle seat according to the present embodiment. However, the present invention can also be applied to a vehicle seat other than a vehicle seat, that is, a seat mounted on a vehicle other than a vehicle (for example, a ship or an aircraft).

  Incidentally, in the following description, the “front-rear direction” means the front-rear direction of the vehicle seat S, and specifically corresponds to the traveling direction of the vehicle. Moreover, the width direction means the width direction of the vehicle seat S, and specifically, is a direction that coincides with the lateral width direction (left-right direction) of the vehicle.

  First, the basic configuration of the vehicle seat S according to the present embodiment will be outlined with reference to FIG. As shown in FIG. 1, the vehicle seat S according to this embodiment includes a seat cushion S <b> 1 that supports a seated person's buttocks from below, a seat back S <b> 2 on which the seated person's back leans, and a seated person's head behind the seat cushion S <b> 1. The headrest S3 is supported. Since the configurations of the seat cushion S1, the seat back S2, and the headrest S3 are the same as known configurations, the description thereof will be omitted.

  Further, as shown in FIG. 1, the vehicle seat S according to the present embodiment includes an ottoman 10 disposed in front of the seat cushion S1. The ottoman 10 supports the lower leg of the seated person from below in front of the seat cushion S1, and constitutes the seat body together with the seat cushion S1, the seat back S2, and the headrest S3.

  Further, the ottoman 10 can move (strictly rotate) in the vertical direction and the front-rear direction. As a result, the state of the ottoman 10 is switched between the state shown in the solid line in FIG. 2 (ie, the use state) and the state shown in the broken line (ie, the storage state). Become. The “use state” is a state in which the ottoman 10 can support the lower leg of the seated person. Specifically, the rear end of the ottoman 10 in the vertical direction is substantially the same height as the front end of the seat cushion S1. In this state, the front end of the ottoman 10 is somewhat lower than the rear end. The “stored state” is a state in which the seat cushion is retracted from the position in the use state toward the front end portion of the seat cushion S1, and specifically, is a state in which the seat cushion is hung at a position immediately before the seat cushion S1.

  The vehicle seat S according to the present embodiment includes the link group 20 illustrated in FIG. 3 as a peripheral device of the ottoman 10. The link group 20 corresponds to a plurality of links, and moves to switch the state of the ottoman 10 that is a part of the seat body between the use state and the storage state. Moreover, in this embodiment, as shown in FIG. 3, the link group 20 is arrange | positioned 1 pair at a time in the state which provided the space | interval in the width direction.

  Moreover, the vehicle seat S according to the present embodiment includes the link cover 40 illustrated in FIG. 4. The link cover 40 is a resin cover member that covers the link group 20 from the front and side. In the present embodiment, the link cover 40 is divided into three parts as shown in FIG. 4, specifically, an upper cover 41, an intermediate cover 42 and a lower cover 43. However, the link cover 40 is not limited to being divided into a plurality of parts as in the present embodiment, and may be constituted by a single part.

  The link cover 40 is to be deformed in conjunction with the switching of the state of the ottoman 10, that is, the operation of the link group 20. Referring to FIGS. 5 and 6, when the state of the ottoman 10 is in use, each link of the link group 20 is at one end position (deployment position) of each movement range. At this time, the link cover 40 has a form (deployed form) in which the upper cover 41, the intermediate cover 42, and the lower cover 43 are arranged vertically as shown in FIG.

  On the other hand, when the state of the ottoman 10 is in the storage position, each link of the link group 20 is at the other end position (storage position) of the respective movement range. At this time, as shown in FIG. 6, the link cover 40 has a form (storage form) in which the upper cover 41 and the lower cover 43 enter the inside (width direction inside) of the intermediate cover 42.

  As described above, in the present embodiment, the form of the link cover 40 is switched in conjunction with the operation of the link group 20. Thereby, when the link group 20 operates (in other words, when the state of the ottoman 10 is switched), interference between the link group 20 and the link cover 40 is avoided, and each link of the link group 20 operates smoothly. It becomes like this.

  Hereinafter, the configuration of the link group 20 will be described in detail with reference to FIG. The link group 20 on one end side in the width direction (left side in FIG. 3) and the link group 20 on the other end side in the width direction (right side in FIG. 3) have a symmetrical structure. Only the configuration of the link group 20 on one end side in the direction will be described.

  The link group 20 includes a plurality of links, and in the present embodiment, includes seven links. More specifically, the plurality of links constituting the link group 20 include one fixed link fixed to the ottoman 10, four main body links forming a pantograph mechanism, and two sub links. It is. And these seven links operate | move in cooperation (movement operation | movement), and the state of the ottoman 10 comes to switch.

  Each link will be described individually. A link corresponding to the above-described fixed link (hereinafter referred to as the first link 21) is fixed to a substantially rectangular pan frame 11 that forms the base portion of the ottoman 10, as shown in FIG. Has been. The first link 21 is bolted to the end of the pan frame 11 in the width direction. When the ottoman 10 is in use, the extending direction and the front-rear direction of the first link 21 are along each other. .

  Four links corresponding to the main body link (hereinafter, the second link 22, the third link 23, the fourth link 24, and the seventh link 27) form a pantograph mechanism as described above. More specifically, the third link 23 and the fourth link 24 correspond to two intersecting links that intersect with each other in a relatively rotatable state. The fourth link 24 corresponds to “one crossing link” in the present invention, and the third link 23 corresponds to “the other crossing link” in the present invention.

  The third link 23 is a substantially Z-shaped link in a side view and is a relatively long link. The one end of the third link 23 in the extending direction is connected to the end of the first link 21 through the rivet R (strictly, the end positioned more rearward when the state of the ottoman 10 is in use). Part) in a rotatable state. When the ottoman 10 is in use, the third link 23 is in a posture in which the extending direction is slightly inclined with respect to the vertical direction, and the end on the side assembled to the first link 21 is at the uppermost position. Will come to be located.

  The fourth link 24 is a substantially linear link when viewed from the side. Further, the central portion in the extending direction of the fourth link 24 is assembled in a rotatable manner with respect to the central portion in the extending direction of the third link 23 via the rivet R. When the ottoman 10 is in use, the fourth link 24 is in a posture in which the extending direction is slightly inclined with respect to the front-rear direction. Strictly speaking, the fourth link 24 is inclined downward toward the rear. Is in an attitude.

  The second link 22 corresponds to a first opposing link, and is a substantially lightning-shaped link in a side view. In addition, one end portion in the extending direction of the second link 22 is connected to an end portion in the extending direction of the first link 21 through the rivet R (strictly speaking, an end positioned more forward when the state of the ottoman 10 is in use). Part) in a rotatable state. Further, the other end portion in the extending direction of the second link 22 is positioned more forward through the rivet R than the end portion in the extending direction of the fourth link 24 (strictly speaking, when the state of the ottoman 10 is in use). It is assembled so as to be rotatable with respect to the end portion. The second link 22 faces the third link 23 in a posture substantially parallel to the third link 23 when the state of the ottoman 10 is in use, and is a side assembled to the first link 21. The end of is located at the uppermost position.

  The seventh link 27 corresponds to a second opposing link, and is a link having a substantially V shape (strictly speaking, a V shape with an obtuse bending angle) when viewed from the side. In addition, one end of the seventh link 27 in the extending direction is connected to an end of the third link 23 in the extending direction via the rivet R (strictly speaking, the end positioned below when the state of the ottoman 10 is in use). Part) in a rotatable state. The seventh link 27 faces the fourth link 24 along the fourth link 24 at a position below the fourth link 24 when the ottoman 10 is in a use state, and is assembled to the third link 23. The end portion on the side that is formed is positioned most forward.

  Two links corresponding to the above-mentioned sub-links (hereinafter, the fifth link 25 and the sixth link 26) are the four links (that is, the second link 22, the third link 23, and the fourth link) that form the above-described pantograph mechanism. 24 and the seventh link 27) are links that operate to move. The sixth link 26 corresponds to the “first sub link” of the present invention. The fifth link 25 corresponds to an “auxiliary link” of the present invention and also corresponds to a “second sublink” of the present invention.

  The fifth link 25 is a substantially V-shaped link (strictly speaking, a V-shape with an obtuse bending angle) when viewed from the side, and is somewhat smaller than the other links. The fifth link 25 is assembled to the end of the fourth link 24 in the extending direction (strictly speaking, the end opposite to the side on which the second link 22 is assembled). More specifically, one end portion of the substantially V-shaped fifth link 25 is rotatable with respect to the extending direction end portion of the fourth link 24 via a rivet R as a rotation shaft. It is assembled. And the 5th link 25 moves the 4th link 24 with the 4th link 24 by operation | movement (strictly rocking | fluctuation operation | movement) itself.

  The sixth link 26 is a link having a substantially V shape (strictly speaking, a V shape having an obtuse bending angle) when viewed from the side. The sixth link 26 is assembled to the fifth link 25 in a state adjacent to the fifth link 25 on the side opposite to the fourth link 24 in the width direction. More specifically, one end portion of the substantially V-shaped sixth link 26 is connected to the end portion of the fifth link 25 via the rivet R (strictly, the side assembled to the fourth link 24). It is assembled in a rotatable state with respect to the opposite end). And the 6th link 26 moves the 5th link 25 with the 5th link 25 by the operation | movement (strictly rocking | fluctuation operation | movement) itself. In other words, the fifth link 25 swings integrally with the sixth link 26 when the sixth link 26 swings.

  Further, the end of the sixth link 26 opposite to the side assembled to the fifth link 25 is, for example, as shown in FIG. 10, through the rivet R as the second rotation shaft. The seven links 27 are assembled so as to be rotatable with respect to an intermediate portion in the extending direction. Then, the sixth link 26 moves along the seventh link 27 by moving itself (strictly swinging movement).

  The link group 20 configured as described above is unfolded from the folded state or folded from the unfolded state when each link moves (swings) within the moving range. Thereby, the state of the ottoman 10 is switched between the use state and the storage state.

  In the present embodiment, the rivet R used as a component for combining the links is arranged so that the axial direction thereof is along the width direction. The rivet R is inserted into a bush (not shown) fitted in an insertion hole formed in each link, and is finally assembled to each link by crimping the end of the rivet R.

  Further, the link group 20 is fixed to the seat cushion S1, strictly speaking, a seat cushion frame (not shown) via a mounting bracket 28 shown in FIG. The mounting bracket 28 will be described. The mounting bracket 28 is made of a plate-like member extending in the vertical direction, and is provided for each of the pair of left and right links 20. That is, in this embodiment, the attachment bracket 28 (attachment bracket on one end side) for attaching the link group 20 disposed on one end side in the width direction to the seat cushion S1, and the link group 20 disposed on the other end side in the width direction. And a mounting bracket 28 (mounting bracket on the other end side) for mounting to the seat cushion S1.

  The fourth bracket 24 and the seventh link 27 of the link group 20 are attached to the attachment bracket 28 via the rivet R so as to be rotatable. Specifically, as shown in FIG. 3, a flange portion 28 a that is bent and extends forward is formed at an end portion on the outer side in the width direction of the mounting bracket 28. Of the link support portions provided at the upper and lower two positions in the flange portion 28a, the link support portion on the upper side has the end portion in the extending direction of the fourth link 24 (strictly speaking, the second link 22 is assembled). The end portion on the side opposite to the side on which it is located is supported via a rivet R so as to be rotatable. The lower link support portion has an end portion in the extending direction of the seventh link 27 (strictly, an end portion opposite to the side assembled to the third link 23) via the rivet R. It is supported in a rotatable state.

  Further, as shown in FIG. 3, a connecting member for connecting the links in the link group 20 is provided between the pair of left and right link groups 20 in order to link both the link groups 20. More specifically, a first connecting member 31 made of a rod material is provided between the first links 21, and a second connecting member 32 made of a pipe material is provided between the fourth links 24 between the sixth links 26. A third connecting member 33 made of a pipe material is arranged between the seventh links 27, and a fourth connecting member 34 made of a rod material is arranged between the seventh links 27. The third connecting member 33 corresponds to the “connecting member” of the present invention.

  Incidentally, the first connecting member 31, the second connecting member 32, and the fourth connecting member 34 are also used as parts for holding the link cover 40. Specifically, the upper cover 41 is attached to the first connecting member 31, the intermediate cover 42 is attached to the second connecting member 32, and the lower cover 43 is attached to the fourth connecting member 34.

  By the way, the seated person of the vehicle seat S according to the present embodiment can automatically switch the state of the ottoman 10 by operating a switch (not shown). That is, the vehicle seat S according to the present embodiment is provided with a drive device that operates the pair of left and right links 20. This driving apparatus will be described. As shown in FIGS. 3 and 7, in this embodiment, the motor M and the advance / retreat member Ms constitute the driving apparatus. The advance / retreat member Ms is a rod-shaped member, specifically a lead screw.

  When the motor M is actuated (rotated), the advancing / retreating member Ms receives the rotational force and linearly moves. At this time, the direction in which the advance / retreat member Ms advances is switched according to the rotation direction of the motor M, whereby the advance / retreat member Ms moves forward and backward while moving straight.

  On the other hand, the distal end portion of the advance / retreat member Ms is attached to the third connecting member 33 via the distal end receiving portion 33a. The tip receiving portion 33 a functions as a driving force receiving portion that receives the driving force of the advance / retreat member Ms and transmits the driving force to each link group 20. More specifically, the tip receiving portion 33 a is a substantially plate-like component that holds the tip portion of the advance / retreat member Ms, and is fixed on the outer peripheral surface of the third connecting member 33.

  When the motor M rotates and the advance / retreat member Ms advances and retreats, the tip receiving portion 33a and the third connecting member 33 are integrated with the tip portion in the direction in which the tip portion of the advance / retreat member Ms is directed in conjunction with this. To move. As a result, the sixth link 26 operates (swings). Thereafter, the driving force from the advance / retreat member Ms is sequentially transmitted to the remaining links via the sixth link 26. For example, when the sixth link 26 swings, the fifth link 25 swings integrally with the sixth link 26, whereby the driving force from the advance / retreat member Ms is transmitted to the fifth link 25. It will be.

  Incidentally, in this embodiment, the advance / retreat member Ms advances / retreats in a direction slightly inclined with respect to the horizontal direction. Specifically, when moving forward, the advance / retreat member Ms moves forward obliquely upward and moves backward. Go straight diagonally downward toward the rear. Such movement of the advancing / retreating member Ms depends on the positional relationship between the motor M and the tip receiving portion 33a. Hereinafter, the positional relationship between the motor M and the tip receiving portion 33a will be described.

  First, the arrangement position of the motor M will be described. As shown in FIG. 3, in the present embodiment, the motor M is arranged between the pair of left and right links 20. More specifically, a horizontally long motor fixing bracket 35 is installed between the mounting bracket 28 at one end in the width direction and the mounting bracket 28 at the other end in the width direction. A motor M is fixed to the front surface of the motor fixing bracket 35. According to such an arrangement position, since the motor M is housed inside the pair of left and right links 20 in the width direction, the mechanism around the ottoman 10 in the vehicle seat S can be made more compact. Is possible.

  Next, the position of the tip receiving portion 33a will be described. As described above, the tip receiving portion 33a is fixed on the outer peripheral surface of the third connecting member 33, strictly speaking, upward from the upper portion of the outer peripheral surface. It is fixed in a state of extending toward it. On the other hand, the third connecting member 33 is at substantially the same position as the motor M in the vertical direction, as shown in FIG. For this reason, the tip receiving portion 33a (in particular, the portion of the tip receiving portion 33a where the tip of the advance / retreat member Ms is fixed) is positioned above the motor M.

  More specifically, as shown in FIG. 9, for example, when the ottoman 10 is in the stored state, the tip receiving portion 33 a is positioned slightly above the motor M. On the other hand, when the state of the ottoman 10 becomes the use state, the tip receiving portion 33a rises from the initial position (position when the state of the ottoman 10 is in the retracted state) and is positioned somewhat above the motor M. It becomes like this.

  Since the motor M and the tip receiving portion 33a are in the positional relationship as described above, the advance / retreat member Ms advances and retreats in a direction slightly inclined with respect to the horizontal direction.

  Next, the flow of switching the state of the ottoman 10 will be described with reference to FIGS. 8 to 10 with the operation of the link group 20 and the advance / retreat member Ms as the center. Each of FIGS. 8 to 10 shows three scenes with different ottoman 10 states. Specifically, in each figure, the upper figure is a figure when the state of the ottoman 10 is in use, the lower figure is a figure when the state is stored, and the middle figure is in the middle of switching. It is a figure when it is in the state.

  When the state of the ottoman 10 is the retracted state, as shown in FIG. 9, the advance / retreat member Ms is most retracted. In this state, the link group 20 is in a folded state. Specifically, as shown in FIGS. 8 and 10, four main body links (that is, the second link 22 and the third link 22) forming a pantograph mechanism. The link 23, the fourth link 24, and the seventh link 27) are in a closed state.

  In the above state, when the motor M operates (rotates), the advancing / retracting member Ms moves forward obliquely upward toward the front. As a result, as shown in FIG. 9, the tip receiving portion 33a and the third connecting member 33 move obliquely upward toward the front integrally with the tip portion of the advance / retreat member Ms. Further, the sixth link 26 swings so as to move obliquely upward toward the front in a manner interlocked with the movement of the third connecting member 33. At this time, the fifth link 25 swings integrally with the sixth link 26, and the fourth link 24 moves as the fifth link 25 swings. More specifically, the fourth link 24 is lifted at the end portion in the extending direction (strictly speaking, the end portion on the side where the second link 22 is assembled) around the rivet R assembled to the mounting bracket 28. It rotates as follows.

  On the other hand, when the sixth link 26 swings so as to move obliquely upward toward the front, the seventh link 27 is moved along with the sixth link 26. More specifically, as shown in FIG. 10, the seventh link 27 has an end portion in the extending direction around the rivet R assembled to the mounting bracket 28 (strictly, the third link 23 is assembled). Rotate so that the side edge is lifted.

  Then, as both the fourth link 24 and the seventh link 27 rotate, the third link 23 moves. Specifically, the third link 23 has an end portion in the extending direction around the rivet R assembled to the seventh link 27 (strictly, the end portion on the side where the first link 21 is assembled). It turns to go upward. At this time, the second link 22 moves in conjunction with the turning operation of the third link 23. More specifically, the second link 22 has an end portion in the extending direction around the rivet R assembled to the fourth link 24 (strictly, the end portion on the side where the first link 21 is assembled). It turns to go upward.

  By the series of movements described above, the state of the ottoman 10 is switched from the stored state to the used state. Further, when the above-described movement is traced in reverse, the state of the ottoman 10 is switched from the use state to the storage state. As described above, in the present embodiment, the driving force from the advance / retreat member Ms is transmitted to each link of the link group 20, so that each link moves, and as a result, the state of the ottoman 10 is switched. .

  On the other hand, as described in the section of the problem to be solved by the invention, rattling may occur between the distal end portion of the advance / retreat member Ms and the distal end receiving portion 33a to which the distal end portion is fixed. In particular, when the rectilinear direction of the advancing / retreating member Ms is inclined with respect to the horizontal direction as in the present embodiment, the leading end portion of the advancing / retreating member Ms is likely to swing, and the occurrence of rattling becomes more noticeable. For this situation, the present embodiment employs a configuration that reduces the degree of backlash when backlash occurs. Specifically, the above-mentioned sublink is included in the link group 20, and the backlash is reduced by the sublink.

  Hereinafter, with reference to FIGS. 11 and 12, the effect of reducing the backlash degree by the sublink will be described in detail. FIG. 11 is an explanatory diagram relating to the movable range of the distal end portion of the advance / retreat member Ms according to the present embodiment, and is a diagram schematically showing the skeleton of the sublink and the advance / retreat member Ms and their rotation trajectories. Moreover, the movable range of the front-end | tip part of the advance / retreat member Ms is represented as a hatched range in FIG.

  Moreover, FIG. 12 is explanatory drawing which concerns on the movable range of the front-end | tip part of the advance / retreat member Ms which concerns on a comparative example. FIG. 12 illustrates a case in which the sub link is not provided and the driving force of the advance / retreat member Ms is transmitted to the main body link. Specifically, the second link in which the fourth links 24 are connected to each other. A case is shown in which the connecting member 32 is provided with the same component as the tip receiving portion 33a (hereinafter, the other tip receiving portion 32x). FIG. 12 schematically shows the skeleton of the fourth link 24 and the advance / retreat member Ms and their rotation trajectories. In FIG. 12, the movable range of the distal end portion of the advance / retreat member Ms is hatched. Expressed as a range.

  11 and 12 both show a state where the state of the ottoman 10 is the storage state.

  First, the backlash degree in the comparative example will be described with reference to FIG. Of the distal end portion of the advancing / retracting member Ms, the fixed portion fixed to the other distal end receiving portion 32x can rotate around the rotation fulcrum (indicated by symbol a in FIG. 12). The rotation locus at this time is referred to as a first locus RA1.

  On the other hand, the fourth link 24 rotates around the rivet R (strictly speaking, the rivet R assembled to the mounting bracket 28, which is expressed as “R0” in FIG. 12). At this time, the portion of the fourth link 24 adjacent to the distal end portion of the advance / retreat member Ms in the width direction (strictly speaking, the fixed portion fixed to the other distal end receiving portion 32x in the distal end portion) is naturally. The rivet R rotates around the center. The rotation locus at this time is referred to as a comparison locus RA0.

  Here, when the first trajectory RA1 and the comparison trajectory RA0 are projected on a virtual plane orthogonal to the width direction (that is, a virtual plane corresponding to the paper surface of FIG. 12), both trajectories are curved as shown in FIG. Although the orientations are different, they are along each other and overlap over a relatively wide area. The range in which both the trajectories overlap corresponds to the movable range of the tip portion of the advance / retreat member Ms. And the rattling at the front-end | tip part of the advance / retreat member Ms may arise within the movable range of the said front-end | tip part. For this reason, when the movable range is relatively wide as in the case shown in FIG. 12, the degree of backlash tends to be relatively large.

  On the other hand, in the present embodiment, the movable range is reduced by providing two sub links, and particularly in the front-rear direction. More specifically, in the present embodiment, of the distal end portion of the advance / retreat member Ms, the fixed portion fixed to the distal end receiving portion 33a rotates around a rotation fulcrum (indicated by symbol a in FIG. 11). Can move. The rotation locus at this time is referred to as a first locus RA1 as in the comparative example.

  On the other hand, of the two sublinks, the fifth link 25 located on the outer side in the width direction is a rivet R (strictly speaking, a rivet R assembled to the fourth link 24, and in FIG. It is possible to rotate around “R1”). At this time, the portion of the fifth link 25 located at the position corresponding to the tip of the advance / retreat member Ms also rotates about the rivet R as a matter of course. The rotation locus at this time is referred to as a second locus RA2. The portion of the fifth link 25 located at the position corresponding to the distal end portion of the advance / retreat member Ms faces the fixed portion fixed to the distal end receiving portion 33a in the distal end portion with the sixth link 26 interposed therebetween. The part which exists in the position which performs, More specifically, it is the part which exists in the same position as said fixed site | part in the circumferential direction of the 3rd connection member 33. FIG.

  Of the two sublinks, the sixth link 26 located on the inner side in the width direction is a rivet R (strictly speaking, a rivet R assembled to the seventh link 27, 11 can be rotated around the center of “R2”. At this time, the portion of the sixth link 26 adjacent to the distal end portion of the advance / retreat member Ms in the width direction (strictly, the fixed portion of the distal end portion fixed to the distal end receiving portion 33a) is naturally also the rivet. It will rotate around R. The rotation locus at this time is referred to as a third locus RA3.

  Here, when the first locus RA1, the second locus RA2, and the third locus RA3 are projected onto a virtual plane orthogonal to the width direction (that is, a virtual plane corresponding to the paper surface of FIG. 11), as shown in FIG. The first locus RA1 and the third locus RA3 partially overlap each other. Further, as shown in the figure, the second locus RA2 intersects (crosses) the range overlapping the third locus RA3 in the first locus RA1. The range where the three trajectories overlap corresponds to the movable range of the tip of the advance / retreat member Ms.

  The movable range of the distal end portion of the advance / retreat member Ms according to the present embodiment is smaller than the movable range according to the comparative example, as can be seen by comparing FIG. 11 and FIG. As a result, the degree of backlash (particularly back and forth backlash) that may occur at the tip of the advance / retreat member Ms is reduced.

  In addition, by reducing the backlash in the front-rear direction, for example, when the ottoman 10 is in the retracted state when the vehicle is running, it is possible to prevent the front end portion of the advance / retreat member Ms from rattling in the front-rear direction. It becomes.

  The configuration of the vehicle seat of the present invention (specifically, the vehicle seat S) has been described above with an example. However, the above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents.

  In the above-described embodiment, the rod-shaped lead screw is used as the advancing / retreating member Ms that moves forward and backward while moving straight to move each link of the link group 20. However, the present invention is not limited to this, and may be a member other than the rod-shaped member as long as the driving force is transmitted to each link by moving forward and backward in the straight direction.

  In the above embodiment, the motor M is used as the drive source for the advance / retreat member Ms. However, as long as the advance / retreat member Ms is driven, a device other than the motor M is used as the drive source for the advance / retreat member Ms. Also good.

  In the above embodiment, the link group 20 is configured by seven links. However, the number of links constituting the link group 20 can be arbitrarily set. In the above-described embodiment, the link group 20 includes two sublinks (that is, the fifth link 25 and the sixth link 26). By providing these two sublinks, the forward / backward movement is performed. The movable range of the tip portion of the member Ms is reduced to reduce the backlash at the tip portion. However, the number of sublinks provided for reducing the movable range of the tip of the advance / retreat member Ms can be arbitrarily set.

  In the above embodiment, the link group 20, the advance / retreat member Ms, and the motor M are used as a mechanism for switching the state of the ottoman 10. That is, in the above-described embodiment, the configuration in which the state of the ottoman 10 is switched by the operation of each link of the link group 20 has been described as an application example of the present invention. However, the present invention can be applied to a vehicle seat in which the state of the seat body can be switched by a plurality of links, and of course, can be applied to a configuration in which a portion other than the ottoman 10 is switched in the seat body. is there. For example, the present invention can also be applied to a vehicle seat having a mechanism (so-called height link mechanism) that moves the seat body (specifically, the seat cushion) in the vertical direction by the operation of a plurality of links.

10 Ottoman 20 Link group 21 First link 22 Second link (first opposing link)
23 Third link (the other crossing link)
24 Fourth link (one crossing link)
25 Fifth link (second sublink, auxiliary link)
26 Sixth link (first sublink)
27 Seventh link (second opposing link)
28 mounting bracket 31 first connecting member 32 second connecting member 32x other tip receiving portion 33 third connecting member (connecting member)
33a Tip receiving part (driving force receiving part)
34 Fourth connecting member 40 Link cover 41 Upper cover 42 Intermediate cover 43 Lower cover R Rivet (rotating shaft, second rotating shaft)
M motor Ms advance / retreat member RA0 comparison locus RA1 first locus RA2 second locus RA3 third locus S vehicle seat S1 seat cushion S2 seat back S3 headrest

Claims (8)

Multiple links that move to switch the state of the seat body,
An advancing and retracting member that moves forward and backward while moving straight to move each of the plurality of links;
A distal end portion of the advance / retreat member is attached, and includes a drive force receiving portion that receives the drive force of the advance / retreat member and transmits the drive force to the plurality of links,
The plurality of links are:
Two intersecting links that intersect with each other so that they can rotate relative to each other;
An auxiliary link that is assembled to one of the two cross links via a rotation shaft and swings when the driving force is transmitted,
Of the distal end portion of the advance / retreat member, a rotation locus when a fixed portion fixed to the driving force receiving portion rotates around a rotation fulcrum is a first locus, and a part of the auxiliary link is the Projecting both the first locus and the second locus on a virtual plane orthogonal to the axial direction of the turning shaft when the turning locus when turning about the turning shaft is the second locus. A vehicle seat characterized in that the two intersect each other.   The plurality of links move to switch the state of the ottoman that supports the lower leg of the seated person between the use state and the storage state in the seat body, and provide an interval in the width direction of the vehicle seat. The vehicle seat according to claim 1, wherein the vehicle seats are arranged one by one in a closed state. The plurality of links are:
A first opposing link that is assembled to the one crossing link and faces the other crossing link along the other crossing link of the two crossing links when the Ottoman state is in the use state When,
A second opposing link assembled to the other crossing link and facing the one crossing link along the one crossing link when the Ottoman state is in the use state;
A first sub-link that is coupled to the driving force receiving unit and swings when the driving force is transmitted;
The vehicle according to claim 2, further comprising: a second sublink as the auxiliary link that is adjacent to the first sublink in the width direction and swings integrally with the first sublink. Sheet. The first sub link is assembled to the second opposing link via a second rotation shaft,
Of the first sub-link, when the portion adjacent to the fixed portion in the width direction rotates about the second rotation axis, the virtual plane is the third plane. When the first trajectory, the second trajectory, and the third trajectory are projected on top, the first trajectory and the third trajectory partially overlap, and the second trajectory is in the first trajectory, The vehicle seat according to claim 3, wherein the vehicle seat intersects with a range overlapping the trajectory. Between the first sublink provided in the plurality of links arranged on one end side in the width direction and the first sublink provided in the plurality of links arranged on the other end side in the width direction. It further has a connecting member to be connected,
The vehicle seat according to claim 3 or 4, wherein the driving force receiving portion is fixed on an outer peripheral surface of the connecting member. A motor for advancing and retracting the advance / retreat member;
The said advancing / retreating member is a rod-shaped member, and when moving forward, it moves straight up diagonally toward the front, and when moving backward, it moves straight down and diagonally downward. The vehicle seat according to claim 5.   The vehicle seat according to claim 6, wherein when the ottoman is in the use state, the driving force receiving portion is positioned above the motor. A mounting bracket on one end side provided to attach the plurality of links arranged on one end side in the width direction to a seat cushion;
An attachment bracket on the other end provided to attach the plurality of links arranged on the other end in the width direction to the seat cushion;
A motor fixing bracket disposed between the mounting bracket on the one end side and the mounting bracket on the other end side in the width direction;
The vehicle seat according to claim 6 or 7, wherein the motor is fixed to the motor fixing bracket.

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