JP5811782B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat provided in a vehicle.

Conventionally, a vehicle seat has various structures for ensuring the safety of an occupant when the vehicle receives a collision.
For example, in the prior art described in Patent Document 1, when the vehicle receives a collision from the rear, the rear seat impact is absorbed by retreating the entire vehicle seat without changing the height of the headrest portion as much as possible. A framework structure for a vehicle seat is disclosed.

JP 2009-29185 A

When the vehicle receives a collision from behind, if the impact on the neck of the occupant is large, so-called “whipping” tends to occur.
In the prior art described in Patent Document 1, since the entire vehicle seat is retracted to absorb the impact at the time of a rear collision, the headrest portion is also retracted, and the movement distance of the occupant's head is increased. It is difficult to reduce the impact on the body. In order to reduce the impact on the occupant's neck, it is preferable that the moving distance to the rear of the headrest portion is shorter.
Moreover, in the prior art described in Patent Document 1, a complicated link mechanism for reversing the entire vehicle seat at the time of a rear collision is provided with a cylindrical rear collision shock absorbing unit for absorbing a rear collision impact. It has. For this reason, the number of parts of the vehicle seat is large, and the structure of the vehicle seat is complicated.
The present invention was devised in view of such points, and with a simpler structure, when a vehicle receives a collision from the rear, it can appropriately absorb the impact and support the head of the occupant. It is an object of the present invention to provide a vehicle seat that can further reduce the amount of rearward movement of the location.

In order to solve the above problems, the vehicle seat according to the present invention takes the following means.
First, the first invention of the present invention is a vehicle seat having a seat cushion portion where an occupant sits down and a seat back portion where the occupant leans back.
The seat cushion portion has a skeleton cushion frame, the seat back portion has a skeleton back frame, and the cushion frame and the back frame are seated on the vehicle seat. It connects with the passenger | crew by the connecting member provided in a pair in the left-right direction.
The connecting member has a position of the seat back portion relative to the seat cushion portion due to a rear load of an occupant sitting on the vehicle seat when the vehicle provided with the vehicle seat is rear-projected. Is formed so as to be deformed so as to move at least backward relative to the occupant.
Further, the connecting member has a plate-like connecting plate, and the connecting plate includes a floating island surface that is a surface fixed to the back frame side and a surface fixed to the cushion frame side. A base surface, and a slit portion is formed at the boundary between the floating island surface and the base surface, and the floating island surface is defined with respect to the base surface, and the weakened portion is The bridge portion is formed to extend downward from above to the occupant seated on the vehicle seat and connects the base surface and the floating island surface.
The bridge portion has an upper bridge portion formed above the floating island surface, and a lower bridge portion formed below the floating island surface, and the lower bridge portion Is formed so as to be more fragile than the upper bridge portion, and when a passenger's rear load is applied, the floating island surface connected to the base surface at the upper bridge portion is In the cavity portion of the slit portion, an arc is drawn like a pendulum so as to move backward.

  In the first aspect of the present invention, the fragile portion is provided in the connecting member that connects the cushion frame and the back frame, and the fragile portion is deformed when the rear impact occurs to appropriately absorb the impact. it can.

Next, a second invention of the present invention is the vehicle seat according to the first invention, wherein the vehicle seat has a connection assisting portion in addition to the bridge portion connecting the base surface and the floating island surface, The connection auxiliary part is formed to be more fragile than the lower bridge part.

According to said 1st invention , the floating island surface is connected with the base surface in the bridge part extended toward the downward direction from upper direction.
By this simple structure, when receiving a rear impact, the bridge part is deformed, and the floating island surface is moved upward and backward relative to the base surface while drawing an arc like a pendulum, The shock can be absorbed appropriately.
Further, since the floating island surface is moved like a pendulum, the back frame fixed to the floating island surface moves backward with respect to the cushion frame and tilts forward. Therefore, the rearward movement amount at the portion that supports the head of the occupant can be further reduced.
Furthermore, the structure of the connection plate can be made simpler.

Next, a third invention of the present invention is a vehicle seat having a seat cushion portion where an occupant sits down and a seat back portion where the occupant leans back.
The seat cushion portion has a skeleton cushion frame, the seat back portion has a skeleton back frame, and the cushion frame and the back frame are seated on the vehicle seat. It connects with the passenger | crew by the connecting member provided in a pair in the left-right direction.
The connecting member has a position of the seat back portion relative to the seat cushion portion due to a rear load of an occupant sitting on the vehicle seat when the vehicle provided with the vehicle seat is rear-projected. Is formed so as to be at least rearwardly moved with respect to the occupant.
Further, the connecting member has a plate-like connecting plate, and the connecting plate includes a floating island surface that is a surface fixed to the back frame side and a surface fixed to the cushion frame side. A base surface, and a slit portion is formed at a boundary between the floating island surface and the base surface, and the floating island surface is defined with respect to the base surface.
The bridge portion is not formed below the floating island surface but is formed only above the floating island surface so as to extend downward from above with respect to an occupant seated on the vehicle seat. When a rear load is applied to the occupant, the floating island surface connected to the base surface at the bridge portion arcs like a pendulum in the cavity of the slit portion with respect to the base surface. It is configured to draw and move backwards.

According to said 1st invention, while being able to implement | achieve the structure of a weak part more simply, the rigidity which supports a floating island surface with respect to a base surface is appropriate in the normal time when the vehicle has not received the collision. Can be secured.

FIG. 2 is a perspective view for explaining the outline of the vehicle seat 1 and the outline of the cushion frame 3F and the back frame 2F inside the vehicle seat 1; It is a perspective view explaining the structure of the connection member 50 which connects the cushion frame 3F and the back frame 2F. It is a figure explaining the external appearance of the connection plate 50P, and the example of another connection plate. It is a figure explaining the movement amount (DELTA) M1 of the location which supports the behavior of the vehicle seat 1 at the time of receiving the collision from back, and a passenger | crew's head.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. 1 to 4, the X axis, the Y axis, and the Z axis indicate orthogonal coordinates, the X axis direction indicates the front-rear direction of the vehicle (the direction toward the X axis is the front), and the Y axis direction indicates the vehicle. The left-right direction (the direction toward the Y-axis is left) is shown, and the Z-axis direction is the up-down direction of the vehicle (the direction toward the Z-axis is up).

● [Appearance of vehicle seat 1 (Fig. 1)]
FIG. 1 is a perspective view of the entire vehicle seat 1.
As shown in FIG. 1, the vehicle seat 1 includes a seat cushion part 3 where the occupant sits down, a seat back part 2 where the occupant leans back, and a headrest part 6 (the occupant's head) Equivalent to the part supporting the head). Note that the headrest portion 6 may be omitted, and the occupant's head may be supported on the upper portion of the seat back portion 2. In the description of the present embodiment, an example of the vehicle seat 1 having the headrest portion 6 will be described.
Moreover, the seat cushion part 3 has the cushion frame 3F used as a skeleton, and the seat back part 2 has the back frame 2F used as a skeleton. The left and right sides of the back frame 2F are connected by a connecting rod 2R, and the left and right sides of the cushion frame 3F are connected by a connecting rod 3R.
The cushion frame 3 </ b> F and the back frame 2 </ b> F are connected to each other by a pair of connecting members 50 provided to the occupant seated on the vehicle seat 1.

Further, the vehicle seat 1 is attached to a pair of left and right slide devices 4 fixed to the floor F of the vehicle.
The slide device 4 includes support tools 40F and 40R, a lower rail 20, an upper rail 10, a support frame 40, a slide lever 30L, and the like.
The support tools 40F and 40R are arranged in the front-rear direction, and each is fixed to the floor surface F.
The lower rail 20 is a rail extending in the front-rear direction, and is fixed to the support tools 40F and 40R.
The upper rail 10 is a rail extending in the front-rear direction, is inserted through the lower rail 20, and is slidable in the front-rear direction with respect to the lower rail 20.
The support frame 40 is fixed to the upper rail 10, and the seat cushion portion 3 of the vehicle seat 1 is connected to the support frame 40.

The occupant can release the slide lock mechanism by operating the slide lever 30L to adjust the position of the vehicle seat 1 in the front-rear direction, and the slide lock mechanism is locked by releasing the slide lever 30L. Can be. Note that description of the details of the slide lock mechanism is omitted.
Further, the occupant can operate the reclining lever 5 to release the reclining lock mechanism and adjust the inclination angle of the seat back part 2 with respect to the seat cushion part 3, and recline by releasing the reclining lever 5. The locking mechanism can be locked. The details of the reclining lock mechanism will not be described.

● [Structure of connecting member 50 (FIG. 2) and structure of connecting plate 50P (FIG. 3)]
Next, the structure of the connecting member 50 will be described with reference to FIG. 2, illustration of the reclining lever 5 and the spring in FIG. 1 is omitted.
The connecting member 50 includes a reclining adjusting member 50A that can adjust the inclination angle of the back frame 2F with respect to the cushion frame 3F, and a plate-like connecting plate 50P. The reclining adjustment member 50A includes a fixed portion 50B that is fixed to the attachment surface 2M of the back frame 2F, and a movable portion 50C that is rotatable relative to the fixed portion 50B.
The fixed portion 50B is fixed to the mounting surface 2M of the back frame 2F, the movable portion 50C is fixed to the connecting plate 50P, and the connecting plate 50P is fixed to the cushion frame 3F.
The reclining adjustment member 50A can use an existing one, and the description of the details of the reclining adjustment member 50A will be omitted.

The connecting plate 50P is formed of a metal or the like that can be deformed by an impact, and includes a base surface 51P, a floating island surface 52P, bridge portions 53P and 54P, a slit portion 56, a mounting hole 55, and the like.
The floating island surface 52P is a surface fixed to the back frame 2F side (in the example of FIG. 2, a surface fixed to the movable portion 50C of the reclining adjustment member 50A fixed to the back frame 2F).
The base surface 51P is a surface that is fixed to the cushion frame 3F side, and in the example illustrated in FIG. 2, is a surface that surrounds the periphery of the floating island surface 52P. The base surface 51P is fixed to the mounting hole 3H of the cushion frame 3F with a bolt B1 or the like inserted through the mounting hole 55.
A slit 56 is formed at the boundary between the floating island surface 52P and the base surface 51P, and the floating island surface 52P is partitioned from the base surface 51P.

When the vehicle receives a collision from the rear, the connecting plate 50P moves the position of the seat back portion 2 relative to the seat cushion portion 3 at least rearward by the rear load of the occupant seated on the vehicle seat 1. The weak part which deform | transforms in this way is formed, and this weak part is the bridge parts 53P and 54P.
The bridge portions 53P and 54P connect and support the floating island surface 52P with respect to the base surface 51P, and are formed to extend downward from above. In addition, although the bridge part demonstrated in this Embodiment is extended toward the downward direction from upper direction, it inclines at angle (theta) A toward the front a little rather than the perpendicular direction (FIG. 3 (A)-( C)). However, even if it is inclined toward the previous term, in the vertical direction, or inclined in the rear direction, it does not have to be in the horizontal direction anyway (including diagonally), and only needs to extend from the top to the bottom. . Note that the inclination angle θA is appropriately set by experiment or the like.
Further, the width W1 of the bridge portion 53P (corresponding to the upper bridge portion) formed above is larger than the width W2 of the bridge portion 54P (corresponding to the lower bridge portion) formed below. Therefore, the lower bridge portion 54P is formed to be more fragile than the upper bridge portion 53P.

Next, another example of the connecting plate 50P will be described with reference to FIG.
3A shows an example of the structure of the connection plate 50Pa of the first embodiment, FIG. 3B shows an example of the structure of the connection plate 50Pb of the second embodiment, and FIG. ) Shows an example of the connection plate 50Pc of the third embodiment.
In the connection plate 50Pa shown in FIG. 3A, the floating island surface 52Pa is connected and supported by bridge portions 53Pa and 54Pa extending downward from above with respect to the base surface 51Pa. Further, the width of the bridge portion 53Pa is greater than the width of the bridge portion 54Pa, and the lower bridge portion 54Pa is formed to be more fragile than the upper bridge portion 53Pa.

  In the connection plate 50Pb shown in FIG. 3B, the floating island surface 52Pb is connected and supported only by the bridge portion 53Pb extending downward from above with respect to the base surface 51Pb. The connection plate 50Pb shown in FIG. 3B has a shape in which the lower bridge portion 54Pa is omitted from the connection plate 50Pa shown in FIG.

  In the connection plate 50Pc shown in FIG. 3C, the floating island surface 52Pc is connected and supported by the bridge portions 53Pc and 54Pc extending from the upper side to the lower side and the connection auxiliary portion 57Pc with respect to the base surface 51Pc. Further, the width of the bridge portion 53Pc is greater than the width of the bridge portion 54Pc, and the lower bridge portion 54Pc is formed to be more fragile than the upper bridge portion 53Pc. Note that any number of the auxiliary connecting portions 57Pc are provided at arbitrary positions, and the width of the auxiliary connecting portions 57Pc is made smaller than the width of the lower bridge portion 54Pc, and the lower connecting auxiliary portion 57Pc It is formed to be more fragile than the bridge portion 54Pc. For this reason, the connection assisting portion 57Pc has a structure that is easier to extend (easily deform) than the bridge portion 53Pc and the bridge portion 54Pc due to the load of the occupant when the vehicle receives a collision.

When the vehicle receives a rear collision, a passenger's rear load is applied, and the rear load is concentrated from the back frame 2F of the seat back portion 2 to the floating island surface 52P (52Pa to 52Pc) of the connecting plate 50P (50 Pa to 50Pc). The upper bridge portion 53P (53Pa to 53Pc) and the lower bridge portion 54P (54Pa, 54Pc and the connection auxiliary portion 57Pc) are deformed. During deformation, the deformation amount of the lower bridge portion 54P is larger than the deformation amount of the upper bridge portion 53P. That is, when an occupant's rear load is applied, the floating island surface 52P (52Pa to 52Pc) with respect to the base surface 51P (51Pa to 51Pc), as shown by the dotted lines in FIGS. It moves so as to draw an arc like a pendulum in the hollow part of the slit part 56 (the floating island surface 52P (52Pa to 52Pc) corresponds to the weight of the pendulum, and the bridge part 53P (53Pa to 53Pc) corresponds to the thread of the pendulum. ). In this case, as shown in FIGS. 3A to 3C, the floating island surfaces 52Pa to 52Pc move like pendulums, and the center P of the floating island surfaces 52Pa to 52Pc moves to the center P ′.
Therefore, the back frame 2F (that is, the seat back portion 2) connected to the floating island surface 52P (52Pa to 52Pc) moves backward by ΔL and moves upward by ΔH with respect to the seat cushion portion 3, It moves so as to incline forward by an angle θ1.

● [Effect of this application (Fig. 4)]
Next, the effect by the connection plate 50P in this Embodiment is demonstrated using FIG.
FIG. 4 is a diagram for explaining the behavior of the vehicle seat 1 before and after the collision by the connection member 50 (connection plate 50P) in the present embodiment when a collision from the rear is received. It is represented by a solid line. Moreover, the state after the collision in the vehicle seat using the connection plate 50P of the present embodiment is indicated by a one-dot chain line, and the state after the collision in a conventional vehicle seat not using the connection plate 50P of the present embodiment. Is represented by a dotted line.
Since the upper rail 10 can slide with respect to the lower rail 20 of the sliding device 4, there is always a gap between the lower rail 20 and the upper rail 10. Due to this gap, both the vehicle seat 1 of the present embodiment and the conventional vehicle seat are inclined rearward at an angle θ2 after the rear impact, and the conventional vehicle seat indicated by the dotted line is a headrest. The rearward movement amount ΔM2 of the portion (the portion that supports the occupant's head) is large.

On the other hand, in the vehicle seat 1 using the connection plate 50P of the present application, the position of the seat cushion portion 3 is the same as that of the conventional vehicle seat after the rear collision, but the position of the seat back portion 2 is greatly different. .
After the rear impact, the floating island surface 52P of the connecting plate 50P moves like a pendulum with respect to the base surface 51P by the occupant's rear load. Accordingly, the seat back portion 2 moves rearward with respect to the seat cushion portion 3 (see ΔL in FIGS. 3A to 3C) and moves upward (see FIGS. 3A to 3C). ΔH), and further tilted forward (see angle θ1 in FIGS. 3A to 3C). Due to the inclination of this angle θ1, as shown in FIG. 4, the headrest portion 6 (the portion that supports the head of the occupant) moves forward from the position of the headrest portion after the conventional rear impact, so that the headrest portion 6 is smaller than the movement amount ΔM2 of the headrest portion of the conventional vehicle seat.
That is, when the vehicle receives a collision from the rear, the position of the seat back portion 2 is moved at least rearward with respect to the seat cushion portion 3 to absorb the impact, and further, the movement amount ΔM1 of the headrest portion 6 is set as follows. The impact on the occupant's neck can be further reduced.
Moreover, the structure of the connecting plate 50P is a very simple structure that can be punched out by a press, and is easy to manufacture. Further, neither a complicated link mechanism nor an impact absorbing device is particularly required, and the safety can be further improved without increasing the number of parts of the vehicle seat 1.

The vehicle seat 1 of the present invention is not limited to the appearance, configuration, structure, shape, and the like described in the present embodiment, and various changes, additions, and deletions can be made without departing from the spirit of the present invention.
In the description of the present embodiment, the example in which the connecting member 50 has the reclining adjusting member 50A has been described. However, in the case of a vehicle seat that does not have the reclining mechanism, the connecting member 50 is formed only by the connecting plate 50P. The base surface 51P of the connection plate 50P may be fixed to the cushion frame 3F, and the floating island surface 52P of the connection plate 50P may be fixed to the back frame 2F.
Further, the shape of the connecting plate 50P is not limited to the shape shown in FIGS. 2 and 3A to 3C, and can be various shapes.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back part 3 Seat cushion part 4 Slide apparatus 5 Reclining lever 6 Headrest part (location which supports a passenger | crew's head)
10 Upper rail 20 Lower rail 50 Connection member 50P Connection plate 51P Base surface 52P Floating island surface 53P, 53Pa, 53Pb, 53Pc (Upper) bridge part 54P, 54Pa, 54Pc (Lower) bridge part 56 Slit part 57Pc Connection auxiliary part ΔM1, ΔM2 Amount of movement (headrest)

Claims (3)

A seat cushion where the occupant sits down,
In a vehicle seat having a seat back portion on which the occupant leans back,
The seat cushion portion has a cushion frame as a skeleton,
The seat back portion has a back frame as a skeleton,
The cushion frame and the back frame are connected by a pair of connecting members provided in a left-right direction with respect to an occupant seated on the vehicle seat,
In the connecting member, the position of the seat back portion relative to the seat cushion portion is determined by a rear load of an occupant seated on the vehicle seat when the vehicle provided with the vehicle seat is rear-projected. A fragile portion that is deformed so as to move at least backward with respect to the occupant is formed ,
The connecting member has a plate-like connecting plate,
The connecting plate has a floating island surface which is a surface fixed to the back frame side, and a base surface which is a surface fixed to the cushion frame side,
A slit portion is formed at the boundary between the floating island surface and the base surface, and the floating island surface is defined with respect to the base surface,
The fragile portion is formed by a bridge portion that is formed so as to extend downward from above with respect to an occupant seated on the vehicle seat, and connects the base surface and the floating island surface,
The bridge portion has an upper bridge portion formed above the floating island surface, and a lower bridge portion formed below the floating island surface,
The lower bridge part is formed to be more fragile than the upper bridge part,
When an occupant's rear load is applied, the floating island surface connected to the base surface at the upper bridge portion forms an arc like a pendulum in the cavity of the slit portion with respect to the base surface. Configured to move to,
Vehicle seat.   The vehicle seat according to claim 1,
  In addition to the bridge portion connecting the base surface and the floating island surface, it has a connection auxiliary portion,
  The connection auxiliary part is formed to be more fragile than the lower bridge part,
  Vehicle seat.   A seat cushion where the occupant sits down,
  In a vehicle seat having a seat back portion on which the occupant leans back,
  The seat cushion portion has a cushion frame as a skeleton,
  The seat back portion has a back frame as a skeleton,
  The cushion frame and the back frame are connected by a pair of connecting members provided in a left-right direction with respect to an occupant seated on the vehicle seat,
  In the connecting member, the position of the seat back portion relative to the seat cushion portion is determined by a rear load of an occupant seated on the vehicle seat when the vehicle provided with the vehicle seat is rear-projected. A bridge portion that is deformed so as to be moved at least backward with respect to the occupant is formed,
  The connecting member has a plate-like connecting plate,
  The connecting plate has a floating island surface which is a surface fixed to the back frame side, and a base surface which is a surface fixed to the cushion frame side,
  A slit portion is formed at the boundary between the floating island surface and the base surface, and the floating island surface is defined with respect to the base surface,
  The bridge portion is formed only above the floating island surface without being formed below the floating island surface, and is formed so as to extend downward from above to an occupant seated on the vehicle seat. And
  When an occupant's rear load is applied, the floating island surface connected to the base surface at the bridge portion forms an arc like a pendulum in the cavity of the slit portion with respect to the base surface. Configured to move,
  Vehicle seat.

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