JP2010202076A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a vehicular seat capable of securing a high degree of energy absorbing capability even when a large load is inputted from behind into a vehicle, while, in addition, the backward inclination angle of a seat back is free from becoming large upon the relative absorption of energy. <P>SOLUTION: The vehicular seat 10 is so arranged as to respectively absorb energy, when a large load is entered into the upper part of its seat back 14, by a first energy absorbing section 16, while to absorb energy when a large load is inputted into the lower part of the sheet back 14, by a second energy absorbing section 18, thereby securely making the amount of energy absorption sufficiently large. In addition, when these energy absorptions are performed, the displacement stroke in the second energy absorption section 18 is found to be greater than the displacement stroke in the first energy absorption section 16, resulting in the seat back 14's backward inclination angle not becoming large, keeping a seated occupant M from sliding and falling from the vehicular seat 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle seat applied to a vehicle such as an automobile.

  Vehicle seats applied to vehicles such as automobiles are required to have high energy absorption performance during sudden deceleration of the vehicle. In recent years, not only front seats (driver seats and passenger seats) but also rear seats. The same performance is required for the seat. Furthermore, it is also required to ensure energy absorption performance when a heavy load is applied to the vehicle from behind (so-called rear collision, etc.).

  Here, in the rear seat of the vehicle, for example, when a large load acts on the vehicle from behind, a large impact load directed toward the rear of the vehicle acts on the seat back depending on the weight of the seated passenger. The large load is absorbed by the back frame (pipe or back pan) of the seat back being bent and deformed to ensure a predetermined energy absorption performance.

  However, in such a conventional seat back energy absorption structure, for example, when an excessive load due to a collision from behind is input to the seat back, the back frame (pipe, etc.) of the seat back is bent and deformed. Although the energy can be absorbed by this, the seat frame itself may be largely inclined backward as a whole because the back frame is bent and deformed. In other words, to ensure high energy absorption performance, it is necessary to set the back frame (pipe, etc.) to be bent and deformed greatly. However, if this setting is made, the rear side inclination angle of the seat back itself increases. It was a contradiction to each other. For this reason, in the conventional vehicle seat, even if the rearward inclination angle of the seat back is increased, it is essential to take measures to prevent the seated occupant from slipping off the seat.

  In this case, a seat has been proposed in which a headrest for protecting the head (neck portion) of a seated occupant moves forward when a large load is input to the vehicle from the rear (for example, Patent Documents). 1).

  In this type of vehicle seat, when a large load is input to the vehicle from behind, the seated occupant is held to some extent by the headrest that has moved forward.

  However, in the seat shown in Patent Document 1, since the headrest simply moves forward when a large load is input to the vehicle from the rear side, that is, the headrest moves by the rearward inclination angle of the seatback itself. However, it is still not possible to sufficiently solve the contradictory problem of "the high back-up angle of the seatback when a large load is applied when trying to ensure high energy absorption performance" as described above. Met.

JP-A-11-70828

  In consideration of the above facts, the present invention can ensure high energy absorption performance even when a large load is input to the vehicle from the rear, and the seatback rearward inclination angle increases when the energy is absorbed. The object is to obtain a vehicle seat that is not.

  The vehicle seat of the invention according to claim 1 supports the seat back and the upper part of the seat back to the vehicle body, and displaces the seat back upper support position when a load exceeding a predetermined value directed toward the rear of the vehicle is input. The first energy absorbing portion that absorbs the load and the lower portion of the seat back are supported by the vehicle body, and the seat back lower support position is displaced larger than the displacement stroke by the first energy absorbing portion when the load is input. And a second energy absorbing portion that absorbs the load.

  In the vehicle seat according to the first aspect, the upper portion of the seat back is supported by the vehicle body by the first energy absorbing portion, while the lower portion of the seat back is supported by the vehicle body by the second energy absorbing portion.

  Here, when a large load is input to the vehicle from the rear, that is, when a large load greater than a predetermined value directed toward the rear of the vehicle is input to the seat back, the first energy absorbing unit supports the upper portion of the seat back. While absorbing the large load while displacing the position, the second energy absorbing portion absorbs the large load while displacing the support position under the seat back.

  Thus, in the vehicle seat according to claim 1, when a large load is input, the upper part of the seat back is absorbed by the first energy absorbing part and the lower part of the seat back is absorbed by the second energy absorbing part. The amount of absorption can be secured sufficiently large. Moreover, in this case, at the time of energy absorption, the displacement stroke in the second energy absorption unit is larger than the displacement stroke in the first energy absorption unit. Therefore, the rearward inclination angle of the seat back does not increase, and the seated occupant does not fall off the vehicle seat.

  The vehicle seat according to the first aspect of the present invention can ensure high energy absorption performance even when a large load is input to the vehicle from the rear, and the seat back has a large inclination angle when absorbing the energy. It has an excellent effect of never becoming.

1 is a perspective view showing main components and seated occupants of a vehicle seat according to an embodiment of the present invention. It is a disassembled perspective view which shows the structure of the 1st energy absorption part of the vehicle seat which concerns on embodiment of this invention. The 1st energy absorption part of the vehicle seat which concerns on embodiment of this invention is shown, (A) is a side view in a normal state, (B) is a side view at the time of energy absorption and lock plate cancellation | release. It is a disassembled perspective view which shows the structure of the 2nd energy absorption part of the vehicle seat which concerns on embodiment of this invention. The 2nd energy absorption part of the vehicle seat which concerns on embodiment of this invention is shown, (A) is a side view in a normal state, (B) is a side view at the time of energy absorption. It is a side view which shows the inclination state of the seat back of the vehicle seat which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. In each figure, the arrow FR direction is the vehicle (seat) front side, and the arrow RE direction is the vehicle (seat) rear side.

  FIG. 1 is a perspective view showing main components of a vehicle seat 10 and a seated passenger M according to an embodiment of the present invention.

  The vehicle seat 10 includes a seat cushion 12 on which an occupant M is seated, and a seat back 14 erected on the rear end side of the seat cushion 12. The upper portion of the seat back 14 is supported by the vehicle body by a pair of left and right first energy absorbing portions 16, and the lower portion thereof is supported by the vehicle body by a pair of left and right second energy absorbing portions 18.

  Here, FIG. 2 shows an exploded perspective view of the configuration of the first energy absorption unit 16, and FIGS. 3A and 3B show the configuration of the first energy absorption unit 16. It is shown in a side view.

  The first energy absorbing unit 16 includes an upper plate 20 and a lower plate 22. The upper plate 20 is made of a plate material, and has a fitting hole 24 and a plurality of comb-like protrusions 26 formed continuously from the fitting hole 24 in the center portion. Similarly, the lower plate 22 is made of a plate material, and has a recess 28 corresponding to the fitting hole 24 and the protrusion 26 of the upper plate 20. The lower plate 22 is integrally assembled to the upper plate 20 by a bolt 30 and a nut 32. Yes.

  The upper plate 20 and the lower plate 22 are integrally attached to the upper portion of the seat back 14 in a state of being assembled with each other, and in this attached state, the pins 34 protruding from the vehicle body side pass through the recesses 28 of the lower plate 22. After the insertion, it enters the insertion hole 24 of the upper plate 20. When the upper plate 20 moves to the vehicle rear side together with the seat back 14 due to a large load acting on the seat back 14, the pin 34 is relatively displaced while sequentially bending the plurality of comb-shaped protrusions 26. It is configured to absorb energy.

  A lock plate 36 is disposed between the upper plate 20 and the lower plate 22. As shown in FIG. 3A, the lock plate 36 is formed in a substantially U shape as a whole, and an intermediate portion is supported by the upper plate 20 so as to be rotatable by a support shaft 38. Further, a torsion coil spring 40 is wound around the support shaft 38 and always urges the lock plate 36. Therefore, normally, the L-shaped tip portion 42 of the lock plate 36 is positioned corresponding to the insertion hole 24 of the upper plate 20 and faces the pin 34 that has entered the insertion hole 24. As a result, the pin 34 comes out of the insertion hole 24 (in other words, the relative displacement of the upper plate 20 relative to the pin 34 toward the vehicle front side, that is, the inclination of the seat back 14 to which the upper plate 20 is attached to the front side). Movement).

  Furthermore, one end of a wire cable 44 is connected to the other end of the lock plate 36, and the other end of the wire cable 44 is connected to a release lever (not shown). By operating the release lever and pulling the wire cable 44, the lock plate 36 can be rotated against the biasing force of the torsion coil spring 40, and the L-shaped tip portion 42 can be detached from the insertion hole 24 of the upper plate 20. it can. Thus, the pin 34 that has entered the insertion hole 24 can be removed from the insertion hole 24 (that is, the seat back 14 to which the upper plate 20 is attached is inclined forward).

  On the other hand, FIG. 4 shows an exploded perspective view of the configuration of the second energy absorption unit 18, and FIGS. 5A and 5B show the configuration of the second energy absorption unit 18 in a side view. It is shown in the figure.

  The second energy absorbing unit 18 includes a bracket 46. The bracket 46 is made of a block material, and has a fitting groove 48 and a plurality of comb-like protrusions 50 formed continuously from the fitting groove 48 on the side surface portion. The bracket 46 is fixed to the floor surface of the vehicle body corresponding to the lower part of the seat back 14, and the pin 52 protruding from the seat back 14 enters the fitting groove 48 in this state. When the pin 52 moves to the vehicle rear side due to a large load acting on the seat back 14, the pin 52 is relatively displaced while bending the comb-like projections 50 in order to absorb predetermined energy. Has been.

  Further, here, the energy absorption stroke by the bracket 46 (protrusion 50) and the pin 52 in the second energy absorbing portion 18 as described above, that is, the displacement stroke of the pin 52 that moves while deforming the protrusion 50 of the bracket 46 is the first energy. It is set to be larger than the energy absorption stroke by the upper plate 20 (projection 26) and the pin 34 in the absorbing portion 16, that is, the displacement stroke of the pin 34 that moves while deforming the projection 26 of the upper plate 20.

  The displacement strokes can be arbitrarily set depending on, for example, the width dimension (size) or the number of formed projections 26 of the upper plate 20 and the projections 50 of the bracket 46.

  The operation and effect of this embodiment will be described below.

  In the vehicle seat 10 configured as described above, the upper portion of the seat back 14 is supported by the vehicle body by the first energy absorbing portion 16, while the lower portion of the seat back 14 is supported by the vehicle body by the second energy absorbing portion 18. (The state shown in FIG. 6A). In this normal state, in the first energy absorbing portion 16, as shown in FIG. 3A, the pin 34 protruding from the vehicle body enters the insertion hole 24 of the upper plate 20 after passing through the recess 28 of the lower plate 22. It is out. Further, in the second energy absorbing portion 18, as shown in FIG. 5A, the pin 52 protruding from the seat back 14 enters the fitting groove 48.

  Here, when a large load is input to the vehicle from the rear, that is, when a large load greater than a predetermined value directed toward the rear of the vehicle is input to the seat back 14 by the weight of the occupant M, the first energy absorbing unit 16 absorbs the large load while displacing the support position of the upper portion of the seat back 14, and the second energy absorber 18 absorbs the large load while displacing the support position of the lower portion of the seat back 14 (FIG. 6B ) State shown).

  That is, in the first energy absorbing portion 16, as shown in FIG. 3B, a large load acts on the seat back 14, so that the upper plate 20 moves to the vehicle rear side together with the seat back 14 and protrudes from the vehicle body side. The pin 34 to be displaced is relatively displaced while sequentially bending the plurality of comb-like protrusions 26 of the upper plate 20, and predetermined energy absorption is achieved. Note that the lock plate 36 shown in FIG. 3B only shows a state in which the wire cable 44 is pulled and rotated, and is irrelevant to energy absorption as described above.

  On the other hand, in the second energy absorbing portion 18, as shown in FIG. 5 (B), a large load acts on the seat back 14 to move to the vehicle rear side, and the pins 52 protruding from the seat back 14 are comb-like. The plurality of protrusions 50 are relatively displaced while being sequentially bent, and predetermined energy absorption is achieved.

  As the energy absorption further proceeds, the energy absorption stroke by the bracket 46 (protrusion 50) and the pin 52 in the second energy absorbing portion 18 (that is, the displacement stroke of the pin 52 that moves while deforming the protrusion 50 of the bracket 46) is the first. 1 Since the energy absorption stroke by the upper plate 20 (projection 26) and the pin 34 in the energy absorbing portion 16 (that is, the displacement stroke of the pin 34 that moves while deforming the projection 26 of the upper plate 20) is set, As shown in FIG. 6C, the rearward inclination angle of the seat back 14 is reduced and energy absorption is completely completed.

  Thus, in the vehicle seat 10 according to the present embodiment, when a large load is input, the upper part of the seat back 14 is provided by the first energy absorbing unit 16 and the lower part of the seat back 14 is provided by the second energy absorbing unit 18. Since each of them absorbs energy, a sufficiently large amount of energy absorption can be secured. In addition, in this case, when the energy is absorbed, the displacement stroke in the second energy absorption unit 18 is larger than the displacement stroke in the first energy absorption unit 16, so the rearward inclination angle of the seat back 14 does not increase, and the seated occupant M does not slip off from the vehicle seat 10.

  In the above-described embodiment, energy absorption is performed by the plurality of protrusions 26 and the pins 34 of the upper plate 20 in the first energy absorption unit 16, and the plurality of brackets 46 in the second energy absorption unit 18. Although the description has been given of the configuration in which energy absorption is performed by the protrusion 50 and the pin 52, the configuration for energy absorption in each energy absorption portion is not limited to this, and other members using members such as a damper and an elastic body are used. Even the configuration can be realized. Even if it is a case where it comprises in this way, the effect similar to the vehicle seat 10 which concerns on embodiment mentioned above can be acquired.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat cushion 14 Seat back 16 1st energy absorption part 18 2nd energy absorption part 20 Upper plate 24 Insertion hole 26 Projection 34 Pin 46 Bracket 48 Insertion groove 50 Projection 52 Pin M Crew

Claims (1)

Seat back,
A first energy absorber that supports the upper portion of the seat back to the vehicle body and absorbs the load by displacing the seat back upper support position when a load of a predetermined value or more directed toward the rear of the vehicle is input;
A second energy absorbing part that supports the lower part of the seat back to the vehicle body and absorbs the load by displacing the seat back lower part supporting position larger than a displacement stroke by the first energy absorbing part when the load is input; ,
A vehicle seat comprising:

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