JP5655361B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat provided with a cantilever recliner.

  2. Description of the Related Art Conventionally, for example, when a rear collision occurs in a vehicle, there is already known a vehicle seat provided with a stopper for restricting the seat back from being largely inclined backward with respect to the seat cushion due to a large load from an occupant. Yes. Here, the following Patent Document 1 discloses a vehicle seat having a plurality of concave and convex stoppers on opposite surfaces of a lower arm that is a frame on the seat cushion side and a side frame that is a frame on the seat back side. Yes. Thereby, even if the stopper function has a compact structure, it is possible to restrict the seat back from being greatly inclined backward.

JP 2009-201589 A

  However, in the technique of Patent Document 1 described above, since a plurality of stoppers act simultaneously, the function of absorbing a heavy load from an occupant (energy absorption function) was not provided.

  The present invention is intended to solve such a problem, and the purpose thereof is to provide a stopper function for restricting the seat back from tilting backward with respect to the seat cushion in a compact structure. It is to provide a vehicle seat having an energy absorption function.

The present invention is for achieving the above object, and is configured as follows.
According to the first aspect of the present invention, both edges of the back frame of the seat back are hinge-coupled to both edges of the cushion frame of the seat cushion, respectively, and one of the hinge coupling sites is one of the hinge coupling sites. Is a vehicle seat provided with a recliner that holds the back frame at a desired tilt position with respect to the cushion frame, and the cushion frame and the back frame at the hinge coupling portion on the other side of both hinge coupling portions; A plurality of stoppers are formed on the opposite surfaces of the back frame to restrict the rearward tilt of the cushion frame from the maximum backward tilt position of the reclining range by the recliner. Backward tilt regulation is performed in stages according to the tilt angle Sea urchin, and the distance in the radial direction around the axis of the hinge are arranged differently, stepwise restriction by a plurality of stoppers, the distance in the radial direction around the axis of the hinge is the longest stopper It is the structure characterized by performing in order from the long stopper remove | excluding .
According to this configuration, for example, the seat back resists the recliner locking force due to a large load acting on the seat back toward the rear due to a large load from the occupant accompanying the occurrence of a rear collision in the vehicle. Even when the vehicle is tilted rearward, the stopper acts in a plurality of stages between the seat cushion and the seat back. Therefore, as explained in the technique of Patent Document 1, since the plurality of stoppers do not act simultaneously, it is possible to restrict the seat back from tilting backward while absorbing a large load from the occupant. Therefore, the stopper function can be provided while the energy absorption function is provided.

Further, the invention according to claim 2 is the vehicle seat according to claim 1 , wherein the last restriction among the stepwise restrictions by the plurality of stoppers is a diameter around the hinge axis. In this configuration, the distance in the direction is set to be the longest .
According to this configuration, since the last restriction is sufficiently buffered, it is possible to absorb a large load without leaving a sense of foreign matter for the occupant.

FIG. 1 is a schematic perspective view of a vehicle seat according to an embodiment of the present invention. FIG. 2 is an enlarged view of the main part (lower arm and upper arm) of FIG. FIG. 3 shows the exploded state of FIG. FIG. 4 is a schematic side view of FIG. 5A is a cross-sectional view taken along line AA in FIG. 4, FIG. 5B is a cross-sectional view taken along line BB in FIG. 4, and FIG. 5C is a cross-sectional view taken along line CC in FIG. It is sectional drawing, (D) is the DD sectional view taken on the line of FIG.

  Hereinafter, the form for implementing this invention is demonstrated using FIGS. In the following description, “right rear seat 1” will be described as an example of “vehicle seat”. In the following description, the terms “up”, “down”, “front”, “rear”, “left”, and “right” refer to the upper, lower, front, rear, left, and right directions described in the above-described drawings, that is, the right rear seat 1 as a reference. When up, down, front, back, left, right are shown.

  First, with reference to FIGS. 1-3, schematic structure of the right rear seat 1 which concerns on the Example of this invention is demonstrated. The right rear seat 1 includes a seat cushion 2 and a seat back 3. In FIG. 1, the cushion pad and the seat cover are omitted in order to make the internal structure of the seat cushion 2 and the seat back 3 easier to see. Hereinafter, the seat cushion 2 and the seat back 3 will be described individually. First, the seat cushion 2 will be described.

  As shown in FIG. 1, the seat cushion 2 includes a cushion frame 10, a known cushion pad (not shown) that is assembled to the cushion frame 10 in a covering manner, and a known seat that covers the surface of the cushion pad. It is comprised from the cover (not shown).

  The cushion frame 10 includes a pair of left and right side frames 12, 14; a front panel 16 that is assembled so as to bridge the front ends (front ends in FIG. 1) of the side frames 12, 14; The rear rod 18 assembled so as to bridge the base end 14 (the rear end in FIG. 1) is formed in a substantially rectangular frame shape.

  Lower arms 20 and 22 are assembled on the base end side (rear end side in FIG. 1) of the surfaces (outer surfaces) of the side frames 12 and 14, respectively. Both the lower arms 20 and 22 are assembled by caulking, for example. The lower arms 20 and 22 are members for pivoting (hinging) the side frames 12 and 14 to both side frames 32 and 34 of the seat back 3 described later.

  Of the lower arms 20 and 22, the inner side (left side in FIG. 1) lower arm 20 includes cut and raised pieces (first cut and raised pieces 20a, second cut and raised pieces 20b, and third cut and raised pieces. 20c and the 4th cut-and-raised piece 20d) are formed in four places toward the inner side (refer FIGS. 2-3). The cut and raised pieces 20a, 20b, 20c, and 20d will be described in detail after the description of the seat back 3 described later. The seat cushion 2 is configured in this way.

  On the other hand, as shown in FIG. 1, the seat back 3 also has a back frame 30, a known cushion pad (not shown) that is assembled to the back frame 30, and the cushion pad, as with the seat cushion 2. It is comprised from the well-known seat cover (not shown) which covers the surface of this.

  The back frame 30 includes a pair of left and right side frames 32, 34, an upper frame 36 that is assembled so as to bridge the tips (upper ends in FIG. 1) of the side frames 32, 34, and both the side frames 32, It is comprised in the substantially rectangular frame shape from the lower panel 38 assembled | attached so that the base end (FIG. 1 lower end) of 34 may be bridged.

  Upper arms 40 and 42 are assembled on the base end side (the lower end side in FIG. 1) of the surfaces (outer surfaces) of the side frames 32 and 34, respectively. The upper arms 40 and 42 are assembled by welding, for example. The upper arms 40 and 42 are members for pivoting (hinging) the side frames 32 and 34 to the side frames 12 and 14 of the seat cushion 2 as described above.

  Among the upper arms 40 and 42, the inner side (left side in FIG. 1) upper arm 40 includes the above-described inner side lower arm 20 cut and raised pieces (first cut and raised pieces 20a and second cut and raised pieces 20b). , The third cut and raised pieces 20c and the fourth cut and raised pieces 20d), which can respectively correspond to (can be contacted with) the cut and raised pieces (first cut and raised pieces 40a, second cut and raised pieces 40b, third Cut and raised pieces 40c and fourth cut and raised pieces 40d) are formed at four locations outward (see FIGS. 2 to 3).

  These cut and raised pieces 40a, 40b, 40c, and 40d are different in the radial direction so as to be equally spaced in the circumferential direction around a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40. It is formed to be a distance.

  In this embodiment, the cut and raised pieces 40a, 40b, 40c, and 40d are formed at intervals of 90 ° in the circumferential direction around a bolt 50 (to be described later) that forms the pivotal axis of the upper arm 40 ( (See FIGS. 4-5).

  The first cut-and-raised piece 40a is formed so as to be separated from a bolt 50, which will be described later, which forms a pivotal axis of the lower arm 20 and the upper arm 40. Similarly, the second cut-and-raised piece 40b is also formed so as to be separated from a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, with a distance Lb.

  Similarly, the third cut-and-raised piece 40c is also formed so as to be separated from the bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, with a distance Lc. Similarly, the fourth cut-and-raised piece 40d is also formed so as to be separated from a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, with a distance Ld. These distances are set so that the relationship “Ld> La> Lb> Lc” is established. The seat back 3 is configured in this way.

  Here, the cut and raised pieces (the first cut and raised piece 20a, the second cut and raised piece 20b, the third cut and raised piece 20c, and the fourth cut and raised piece 20d) of the inner side lower arm 20 described above are described in detail. Then, these cut and raised pieces 20a, 20b, 20c, and 20d are also arranged at different intervals in the circumferential direction around a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, and in the radial direction. Are formed at different distances.

  In this embodiment, the first cut-and-raised piece 20a has a θa relative to the first cut-and-raised piece 40a of the upper arm 40 described above when the seat back 3 is at a maximum rearward tilt position described later with respect to the seat cushion 2. (In this example, there is no description because of “0 °”). Similarly to the first cut and raised piece 40a of the upper arm 40 described above, the first cut and raised piece 20a is separated from the bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, with a distance La. Is formed. That is, the first cut-and-cut piece 20a is in contact with the first cut-and-cut piece 40a of the upper arm 40 described above when the seat back 3 is at a maximum rearward tilt position described later with respect to the seat cushion 2. It is formed to become.

  Similarly, the second cut and raised piece 20b is also formed so as to be separated from the second cut and raised piece 40b of the upper arm 40 by an angle θb. Similarly to the second cut and raised piece 40b of the upper arm 40 described above, the second cut and raised piece 20b is also formed so as to be separated from a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40. Has been.

  Similarly, the third cut-and-raised piece 20c is also formed so as to be separated from the third cut-and-raised piece 40c of the upper arm 40 by an angle θc. Further, the third cut-and-raised piece 20c is also separated from a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, similarly to the third cut-and-raised piece 40c of the upper arm 40 described above. Is formed.

  Similarly, the fourth cut-and-raised piece 20d is also formed so as to have an angle of θd with respect to the fourth cut-and-raised piece 40d of the upper arm 40 described above. The fourth cut-and-raised piece 20d is also separated from a bolt 50, which will be described later, which forms the pivotal axis of the lower arm 20 and the upper arm 40, similarly to the fourth cut-and-raised piece 40d of the upper arm 40 described above. Is formed.

  These angles are set so that the relationship “θd> θc> θb> θa” is established. The cut and raised pieces (the first cut and raised piece 20a, the second cut and raised piece 20b, the third cut and raised piece 20c, and the fourth cut and raised piece 20d) of the inner side lower arm 20 are configured in this way. Yes.

  The lower arm 20 on the inner side (left side in FIG. 1) of the seat cushion 2 described above and the upper arm 40 on the inner side of the seat back 3 described above are pivoted (hinge coupled) via bolts 50 and nuts 52. ) At this time, as is clear from FIG. 3, since the washer 54 is interposed, the lower arm 20 and the upper arm 40 can be pivotally mounted without causing the nut 52 to loosen.

  On the contrary, the lower arm 22 on the outer side (right side in FIG. 1) of the seat cushion 2 and the upper arm 42 on the outer side of the seat back 3 are assembled via a known recliner 60. Yes. Thus, the tilt position of the seat back 3 with respect to the seat cushion 2 can be switched in the range from the normal position (position used during normal seating) to the maximum rearward tilt position (position used in the reclining state). The right rear seat 1 is configured in this way.

  Next, the operation of the right rear seat 1 described above will be described. In this description, the description will be made from the state in which the tilt position of the seat back 3 with respect to the seat cushion 2 is used at the maximum backward tilt position.

  From this state, for example, when a rear collision occurs in the vehicle, a large load is applied to the seat back 3 backward due to a large load from the occupant. As a result, the seat back 3 tilts backward against the locking force of the recliner 60. At this time, as already described, the first cut and raised piece 40a of the seat back 3 is in contact with the first cut and raised piece 20a of the seat cushion 2.

  As a result, a stopper (hereinafter referred to as “first stopper”) acts between the seat cushion 2 and the seat back 3. The seat back 3 is tilted rearward by breaking (against the stopper force of the first stopper).

  Further, when the seat back 3 is tilted, the second cut and raised piece 40b of the seat back 3 is in contact with the second cut and raised piece 20b of the seat cushion 2. As a result, a stopper (hereinafter referred to as “second stopper”) acts between the seat cushion 2 and the seat back 3 again. When it is destroyed (against the stopper force of the second stopper), the seat back 3 tilts backward.

  As the seat back 3 further tilts, the third cut and raised piece 40c of the seat back 3 is in contact with the third cut and raised piece 20c of the seat cushion 2 next. As a result, a stopper (hereinafter referred to as “third stopper”) acts between the seat cushion 2 and the seat back 3 again. The seat back 3 is tilted rearward by breaking (against the stopper force of the third stopper).

  Further, when the seat back 3 is further inclined, the third cut and raised piece 40d of the seat back 3 is in contact with the fourth cut and raised piece 20d of the seat cushion 2 next. As a result, a stopper (hereinafter referred to as “fourth stopper”) acts between the seat cushion 2 and the seat back 3 again. The inclination of the seat back 3 is regulated.

  The right rear seat 1 according to the embodiment of the present invention is configured as described above. According to this configuration, for example, a large load acting on the seat back 3 due to a large load from the occupant accompanying a rear collision in the vehicle causes the seat back 3 to lock the recliner 60. Even when the vehicle is tilted rearward against the above, there are four steps between the seat cushion 2 and the seat back 3 (first stopper, second stopper, third stopper, fourth stopper). Stopper) will act. Therefore, as explained in the technology of Patent Document 1, a plurality of stoppers do not act at the same time, so that it is possible to restrict the seat back 3 from tilting backward while absorbing a large load from the occupant. Therefore, the stopper function can be provided while the energy absorption function is provided.

  Further, according to this configuration, each stopper (the first stopper, the second stopper, the third stopper, and the fourth stopper) is separated from the bolt 50 that forms the pivotal axis of the lower arm 20 and the upper arm 40 by a distance La. , Lb, Lc, and Ld (Ld> La> Lb> Lc). Therefore, many stoppers can be formed even in a narrow space (in this example, the lower arm 20 and the upper arm 40).

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In the embodiment, four stoppers (first stopper, second stopper, third stopper, and fourth stopper) have been described as examples of the plurality of stoppers. However, it is not limited to this, and any number of two or more may be used.

  Further, in the embodiment, each cut and raised piece (first cut and raised piece 20a, second cut and raised piece 20b, third cut and raised piece 20c, and fourth cut and raised piece 20d) is formed on the lower arm 20. The example in which the cut and raised pieces (the first cut and raised pieces 40a, the second cut and raised pieces 40b, the third cut and raised pieces 40c, and the fourth cut and raised pieces 40d) are formed on the upper arm 40 has been described. However, the present invention is not limited to this, and without providing the lower arm 20 and the upper arm 40, the left side frame 12 is provided with the cut and raised pieces (first cut and raised pieces 20a, second cut and raised pieces 20b, and third The cut and raised pieces 20c and the fourth cut and raised pieces 20d) are formed, and the cut and raised pieces (first cut and raised pieces 40a, second cut and raised pieces 40b, and third cut and raised pieces are formed on the left side frame 32. 40c, a fourth cut and raised piece 40d) may be formed.

  In the embodiment, when a large load acts on the seat back 3 backward, the seat back 3 resists the locking force of the recliner 60, the first stopper, the second stopper, and the third stopper. An example has been described in which it tilts backward until it is regulated by the stopper. However, the present invention is not limited to this, and the seat back 3 may be regulated by the second stopper or the third stopper. Which stopper restricts the seat back 3 is determined by the magnitude of the large load.

1 right rear seat 2 seat cushion 3 seat back 10 cushion frame 20a first cut and raised piece 20b second cut and raised piece 20c third cut and raised piece 20d fourth cut and raised piece 30 back frame 40a first cut and raised Piece 40b second cut and raised piece 40c third cut and raised piece 40d fourth cut and raised piece 60 recliner

Claims (2)

Both edges of the back frame of the seat back are hinge-coupled to both edges of the cushion frame of the seat cushion, and one of the hinge coupling parts of the hinge coupling parts has a back frame with respect to the cushion frame. Is a vehicle seat equipped with a recliner that holds the desired tilt position,
Of the two hinge joints, the cushion frame and the back frame facing each other at the hinge joint on the other side are further backward from the maximum rearward tilt position of the reclining range by the recliner with respect to the back frame. A plurality of stoppers that regulate the tilt are formed,
The plurality of stoppers are arranged so that the rearward inclination of the back frame is regulated stepwise according to the inclination angle, and the radial distance around the hinge axis is different. And
The vehicle seat is characterized in that the stepwise regulation by the plurality of stoppers is performed in order from a long stopper except a stopper having a longest radial distance around the hinge axis. The vehicle seat according to claim 1,
Of the stepwise restrictions by the plurality of stoppers, the last restriction is set such that the radial distance centered on the hinge axis is the longest .

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