JP2013091343A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat capable of compactifying a lifter device having an anti-sinking structure.SOLUTION: The vehicle seat 1 includes: a lifter device 20 that adjusts the height of a seating part 10 where the occupant seats; and a locking means 30 that prevents sinking of the seating part 10 at vehicle crash from backward. The lifter device 20 includes: a linking member 21 of which one side end is turnably coupled with the seating part 10 and the other side end is coupled with a supporting member that supports the seat, turns by the end of the other side as a fulcrum when vertically moving the seating part 10, and the end of one side moves vertically; and a locked member 22 where a locked tooth part 221 that turns with the linking member 21. The locking means 30 includes locking members 31 and 32 that have the locking tooth parts 311 and 321 that move to the locking position engaging to the locked tooth part 221 from the original position by the load when crashing to the vehicle from backward.

Description

  The present invention relates to a vehicle seat provided with a lifter device that adjusts the height of a seating portion of the seat.

  A vehicle seat provided with a lifter device that adjusts the height of a seating portion within a predetermined range is known. Such a vehicle seat is provided with a structure (sink prevention structure) that prevents the seating portion from sinking at the time of a vehicle collision from the rear (rear collision), as described in Patent Document 1 below. There is.

JP 2009-208737 A

  However, the structure described in Patent Document 1 is provided with a stopper pin (29) for supporting the rear link (14) and a bracket (30) for transmitting a load transmitted to the rear link at the time of a rear collision to the upper rail (12). There is a problem that the lifter device becomes large in the vehicle front-rear direction.

  In view of the above circumstances, the problem to be solved by the present invention is to provide a vehicle seat capable of making the lifter device having a sinking prevention structure compact.

  In order to solve the above-described problems, the present invention provides a vehicle with a lifter device that adjusts the height of a seating portion on which an occupant sits, and a lock unit that prevents the seating portion from sinking in the event of a vehicle collision from behind In the seat, the lifter device has one end rotatably connected to the seating portion and the other end rotatably connected to a support member that supports the seat. A link member that pivots around the other end when moving up and down, and the one end moves up and down, and a locked member on which a locked tooth portion that rotates together with the link member is formed. The lock means includes a lock member having a lock tooth portion that moves from an original position to a lock position that meshes with the locked tooth portion when the vehicle collides from behind.

  In the above configuration, when the vehicle collides from the rear, the lock tooth portion of the lock member meshes with the locked tooth portion of the locked member that rotates together with the link member, so that the rotation of the link member is prevented and the seat portion sinks. Is prevented. Since the locked tooth portion rotates together with the link member, and the lock member can be installed near the locked tooth portion, the sinking prevention structure can be made compact. Moreover, since the rotation of the link member is directly prevented by the lock member, an excellent effect of preventing the sinking is exhibited.

  In this case, the lock means includes an upper lock member having a first lock tooth portion located above the lock tooth portion, and the lock member that is rotatably connected to the upper lock member. A lower lock member having a second lock tooth portion positioned below the tooth portion, and the lock tooth portions of the two lock members so that the lock tooth portions of these lock members do not mesh with the locked tooth portion in a normal state. An urging member for urging in a direction away from the urging member, and when the vehicle collides from the rear, the upper lock member rotates downward against the urging force of the urging member due to the load. The lock tooth portion meshes with the locked tooth portion, and the second lock tooth portion of the lower lock member pulled by the rotation of the upper lock member meshes with the locked tooth portion. That's fine.

  In this way, when the vehicle collides from the rear, the locked tooth portion that rotates together with the link member is sandwiched between the upper lock member and the lower lock member that moves by being pulled by the upper lock member. Thus, the rotation of the link member can be more reliably prevented.

  Further, in this case, a restraining member that moves to a position where it engages with an engaged portion provided on the upper surface of the upper lock member at the time of a vehicle collision from the rear, and further prevents the upper lock member from rotating upward. It is good to have.

  In this way, it is possible to reliably maintain at least the state in which the first lock tooth portion formed on the upper lock member and the locked tooth portion are engaged, that is, the state in which the rotation of the link member is prevented.

  The vehicle seat according to the present invention has a structure in which the rotation of the link member is prevented by locking the locked tooth portion of the locked member that rotates together with the link member by the lock member. Can be made compact.

It is a side view of the vehicular seat concerning a first embodiment of the present invention, and Drawing 1 (a) shows a normal state and Drawing 1 (b) shows the state where rotation of a link member was blocked. It is the sectional view on the AA line in FIG. It is a side view of the vehicle seat concerning a 1st modification. It is a side view of the vehicle seat concerning a 2nd modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the vertical direction (height direction) refers to the height direction of the vehicle seat 1 (Z-axis direction shown), and the front-rear direction refers to the front-rear direction of the vehicle seat 1 (Y-axis direction shown). The width direction refers to the width direction of the vehicle seat 1 (X-axis direction shown in the drawing).

  The vehicle seat 1 according to the present embodiment includes a seat body, a lifter device 20, and a lock unit 30. As the seat body, a well-known general one having a seating portion 10 (seat cushion) and a backrest portion (seat back) on which an occupant sits can be applied, and detailed description thereof is omitted.

  The lifter device 20 is a device having a link member 21 that can set the seating portion 10 to an arbitrary height within a predetermined range. As a mechanism for changing the height of the seating portion 10, a known general mechanism can be applied. For example, a device that moves the seating portion 10 up and down by rotating the sector gear by human power (lever operation) or a drive source (motor or the like) can be applied (see, for example, Japanese Patent Application Laid-Open No. 2011-173396). A total of four link members 21 are provided on the front and rear sides of the vehicle, respectively. The end of the link member 21 on the floor side is rotatably connected to an upper rail 51 (corresponding to a support member in the present invention) via a bracket 40 having a substantially U-shaped cross section and a locked member 22 described later. The other end is pivotally connected to a seating portion 10 (specifically, a seat frame constituting the seating portion 10). The upper rail 51 is a member that slides along the lower rail 52 fixed to the floor. That is, the seat body can slide in the front-rear direction. When the lifter device 20 is driven and the seat portion 10 is moved up and down, the link member 21 rotates with the end portion on the floor side as a fulcrum, and the end portion on the seat portion 10 side moves up and down.

  The lifter device 20 has a locked member 22. The locked member 22 is a shaft member that is rotatably supported by the bracket 40 so that the axis line coincides with the width direction. Locked tooth portions 221 are formed in portions of the locked member 22 located between both side walls of the bracket 40. The link member 21 is fixed to the outside of the side wall on one side of the bracket 40 in the locked member 22. The locked member 22 and the link member 21 are joined by welding or the like, for example. Therefore, when the link member 21 rotates with the end portion on the floor side as a fulcrum, the locked tooth portion 221 of the locked member 22 also rotates accordingly. Therefore, if the rotation of the locked tooth portion 221 is prevented, the rotation of the link member 21 is also prevented. The locked member 22 may be integrally formed with the link member 21. In other words, any configuration may be used as long as the locked tooth portion 221 rotates together with the link member 21.

  The lock means 30 is configured to prevent the link member 21 from rotating when the vehicle collides from the rear and prevent the seating portion 10 from sinking. The lock means 30 includes a lock member having a lock tooth portion that meshes with the locked tooth portion 221 of the link member 21 by a load at the time of a vehicle collision. Hereinafter, a specific configuration of the lock means 30 included in the vehicle seat 1 according to the present embodiment will be described in detail. The lock means 30 includes an upper lock member 31, a lower lock member 32, and an urging member 33.

  The upper lock member 31 is located above the locked tooth portion 221. On the lower surface of the upper lock member 31, a first lock tooth portion 311 that can mesh with the locked tooth portion 221 is formed. On the other hand, the lower lock member 32 is positioned below the locked tooth portion 221. On the upper surface of the lower lock member 32, a second lock tooth portion 321 that can mesh with the locked tooth portion 221 is formed. The lower lock member 32 has a shape such that the rear end side (front end side) protrudes upward together with the second lock tooth portion 321 formed on the upper surface thereof. Specifically, the locked tooth portion 221 and the second lock tooth portion 321 are positioned so as to overlap in the horizontal direction. The upper lock member 31 and the lower lock member 32 are connected at the front end (base end) so as to be rotatable in a direction toward and away from each other by a connecting shaft 42. Further, the entire lock means 30 (the connected upper lock member 31 and the lower lock member 32) is rotated by a rotation support shaft 41 fixed to the bracket 40 on the front end side (base end side) of the upper lock member 31. It is supported freely. That is, the entire locking means 30 rotates with respect to the bracket 40 with the rotation support shaft 41 as a fulcrum. The position where the rotation support shaft 41 is provided is behind the position (front end) where the connection shaft 42 is provided. Further, the center of gravity G of the upper lock member 31 is located behind the position where the lock means 30 is rotatably supported by the rotation support shaft 41 (hereinafter simply referred to as the center of rotation (of the lock means 30)). It is set to be.

  The upper side lock member 31 and the lower side lock member 32 are biased in a direction away from each other by a biasing member 33 (torsion spring). Although the attachment method of the urging member 33 is not limited to a specific method, in the present embodiment, the urging member 33 is inserted through the rotation support shaft 41 and attached. The lower lock member 32 urged by the urging member 33 has a lower surface in contact with the bottom surface of the bracket 40. The urging force of the urging member 33 is a normal state (which means a normal state in which no vehicle collision occurs from the rear. The same applies hereinafter), and the first lock tooth portion 311 and the lower side of the upper lock member 31. The second locking tooth portion 321 of the locking member 32 is set to a force that does not mesh with the locked tooth portion 221.

  Hereinafter, an operation (operation) of the lock means 30 having such a configuration will be described. In the event of a vehicle collision from the rear, a backward inertia force is generated in the lock means 30. As described above, the center of gravity of the upper lock member 31 is located behind the center of rotation. Therefore, the upper lock member 31 rotates downward (in the direction of arrow B shown in FIG. 1) against the urging force of the urging member 33 due to the inertial load due to the weight of the upper lock member 31. That is, the first lock tooth portion 311 of the upper lock member 31 moves in a direction approaching the locked tooth portion 221, and the lock tooth portion at the first position meshes with the locked tooth portion 221.

  When the upper lock member 31 rotates downward, the lower lock member 32 connected to the upper lock member 31 is pulled forward by the upper lock member 31 so as to slide on the bottom surface of the bracket 40. To do. When the lower lock tooth portion moves in this way, the second lock tooth portion 321 located so as to overlap the locked tooth portion 221 in the horizontal direction moves forward and meshes with the locked tooth portion 221 as it is. To do.

  Thus, at the time of a vehicle collision from the rear, the first locking tooth portion 311 of the upper locking member 31 and the second locking tooth portion 321 of the lower locking member 32 rotate together with the link member 21. Engage with 221 in between. When both the lock teeth engage with the locked teeth 221, the link member 21 can no longer rotate. Therefore, the link member 21 rotates backward due to the inertial load acting on the occupant during a vehicle collision from the rear. This can prevent the seat 10 from sinking.

  The urging force of the urging member 33 is such that the first lock tooth portion 311 of the upper lock member 31 and the second lock tooth portion 321 of the lower lock member 32 mesh with the locked tooth portion 221 at least by the inertia load. It is set to the size to move until. In other words, the urging force of the urging member 33 is the first when the first locking tooth portion 311 and the second locking tooth portion 321 are not engaged with the locked tooth portion 221 and the vehicle is collided from the rear. The first lock tooth portion 311 and the second lock tooth portion 321 are set so as to move until they mesh with the locked tooth portion 221. The inertial force generated in the locking means 30 at the time of a vehicle collision may be calculated based on the impact at the time of the vehicle collision when there is a possibility that the seating portion 10 may sink.

  Further, the locking means 30 may be installed on at least one of the link members 21 on the vehicle rear side. In order to increase the effect of preventing the seating portion 10 from sinking, it may be installed on both the link members 21 located on the rear side of the vehicle, or may be installed on all the link members 21 provided on the vehicle. Good.

  Next, a modified example of the vehicle seat 1 (locking means 30) according to the above embodiment will be described. The following modifications (first modification and second modification) are all provided with a configuration for further enhancing the locking function of the locking means 30. In addition, description is abbreviate | omitted about the structure same as the said embodiment.

  The locking means 30 of the first modification further includes a restraining member (hereinafter, the restraining member of the present modification is referred to as the first restraining member 60 in order to be distinguished from the restraining member of the second modification). The first restraining member 60 is a claw-like member provided above the upper lock member 31. Specifically, it is rotatably supported on the inner surface of the side wall of the bracket 40 (the side wall on the upper lock member 31 side). On the other hand, on the upper surface of the upper lock member 31, an engaged portion which is a protrusion protruding upward (hereinafter, the engaged portion of this modification is distinguished from the engaged portion of the second modification). 1st engaged part 30a) is formed.

  In the normal state, the inner (rear) surface of the first restraining member 60 is in contact with the upper surface (first engaged portion 30a) of the upper lock member 31. Specifically, the first restraining member 60 is in a state in which the rotation of the first restraining member 60 is restricted by the upper lock member 31 urged upward by the urging member 33 (upper side). It is in a state of leaning against the lock member 31).

  When the vehicle collides from the rear, the upper lock member 31 rotates downward, and the first lock tooth portion 311 meshes with the locked tooth portion 221. Further, the second lock tooth portion 321 of the lower lock member 32 also meshes with the locked tooth portion 221. Accordingly, the first restraining member 60 that has been leaning against the upper lock member 31 is rotated downward by its own weight. When the upper locking member 31 and the first restraining member 60 move in this way, the entire first restraining member 60 is positioned in front of the first engaged portion 30a of the upper locking member 31, and the first restraining member The leading end of 60 comes into contact with the front side of the first engaged portion 30 a of the upper lock member 31. In such a state, the first restraining member 60 acts on the upper lock member 31 in the form of a so-called tension rod, and restricts the upper lock member 31 from rotating upward.

  When the upward rotation of the upper lock member 31 is restricted in this way, the state where the first lock tooth portion 311 of the upper lock member 31 and the locked tooth portion 221 are engaged is maintained. Naturally, the state where the second lock tooth portion 321 of the lower lock member 32 and the locked tooth portion 221 are engaged is also maintained. That is, if the configuration according to this modification is applied, not only the moment when the vehicle collides from behind but also the state in which the rotation of the link member 21 to the rear is prevented after the collision. Accordingly, it is possible to prevent the seat portion 10 from sinking due to the state in which the rotation of the link member 21 is prevented by the upper lock member 31 and the lower lock member 32 immediately after the collision of the vehicle.

  Next, the lock means 30 of the second modification will be described. The locking means 30 of the second modification example further includes a restraining member (hereinafter, the restraining member of this modification example is referred to as a second restraining member 70 in order to be distinguished from the restraining member of the first modification example). The second restraining member 70 is a shaft-like member that is rotatably provided on the bracket 40. The second restraining member 70 is a base end portion which is a lower end portion rotatably supported by the bracket 40 and a shaft-like portion extending in the width direction and is positioned above the upper lock member 31. It has the restraint part 71 to do. On the other hand, on the upper surface of the upper lock member 31, there is an engaged portion that is a protrusion protruding upward (hereinafter, the engaged portion of this modification example is distinguished from the engaged portion of the first modification example). Is referred to as a second engaged portion 30b).

  In a normal state, the restraint portion 71 of the second restraint member 70 is in contact with the upper surface of the upper lock member 31 (the front side of the first engaged portion 30a). Specifically, the second restraining member 70 is rotated by the upper locking member 31 urged upward by the urging member 33 while the second restraining member 70 is about to rotate backward with its own weight as the center. It is in a restricted state (a state leaning on the upper lock member 31).

  When the vehicle collides from the rear, the upper lock member 31 rotates downward, and the first lock tooth portion 311 meshes with the locked tooth portion 221. Further, the second lock tooth portion 321 of the lower lock member 32 also meshes with the locked tooth portion 221. Accordingly, the second restraining member 70 (restraining portion 71) that has been leaning against the upper locking member 31 is rotated downward about the base end portion by its own weight. When the upper locking member 31 and the second restraining member 70 move in this way, the restraining portion 71 of the second restraining member 70 gets over the second engaged portion 30b of the upper locking member 31, and the second engaged member. It will be in the state which contacted the rear side of the joint part 30b. With such a state, the upper locking member 31 is restricted from turning upward by the restraining portion 71 of the second restraining member 70 that is hooked on the second engaged portion 30b.

  When the upward rotation of the upper lock member 31 is restricted in this way, the state where the first lock tooth portion 311 of the upper lock member 31 and the locked tooth portion 221 are engaged is maintained. Naturally, the state where the second lock tooth portion 321 of the lower lock member 32 and the locked tooth portion 221 are engaged is also maintained. That is, if the configuration according to the present modification is applied, the state in which the rotation of the link member 21 is prevented by the upper lock member 31 and the lower lock member 32 after the collision of the vehicle, as in the first modification. It is possible to prevent the seating portion 10 from sinking due to immediate elimination.

  These modifications are merely examples. Any configuration may be used as long as the upper lock member 31 is prevented from rotating upward when the upper lock member 31 moves to a position where the first lock tooth portion 311 meshes with the locked tooth portion 221.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Seating part 20 Lifter device 21 Link member 22 Locked member 221 Locked tooth part 30 Locking means 31 Upper lock member 311 First lock tooth part 32 Lower lock member 321 Second lock tooth part 33 Force members 60, 70 Restraining members 30a, 30b Engaged portion

Claims (3)

In a vehicle seat comprising: a lifter device that adjusts the height of a seating portion on which an occupant sits; and a locking means that prevents the seating portion from sinking during a vehicle collision from behind,
In the lifter device, one end portion is rotatably connected to the seating portion, and the other end portion is rotatably connected to a support member that supports a seat to move the seating portion up and down. A link member that rotates with the other end portion as a fulcrum, and the one end portion moves up and down, and a locked member in which a locked tooth portion that rotates together with the link member is formed. ,
The vehicle seat according to claim 1, wherein the lock means includes a lock member having a lock tooth portion that moves from an original position to a lock position that meshes with the locked tooth portion by a load when the vehicle collides from behind. The locking means is
An upper lock member having a first lock tooth portion located above the locked tooth portion;
A lower lock member having a second lock tooth portion, which is rotatably connected to the upper lock member, and is located below the lock tooth portion;
An urging member for urging both lock teeth in a direction away from each other so that the lock teeth of the lock members do not mesh with the locked teeth in a normal state,
At the time of a vehicle collision from the rear, the upper lock member rotates downward against the urging force of the urging member due to the load, and the first lock tooth portion meshes with the locked tooth portion. 2. The vehicle seat according to claim 1, wherein the second lock tooth portion of the lower lock member pulled by the rotation of the upper lock member meshes with the locked tooth portion.   It further includes a restraining member that moves to a position where it engages with an engaged portion provided on the upper surface of the upper lock member at the time of a vehicle collision from behind, and prevents the upper lock member from rotating upward. The vehicle seat according to claim 2.

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