JP2001239871A - Shock absorbing seat for vehicle and seat back frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the protection after the absorption of impact energy at back crash. SOLUTION: The backward movement of a person sitting on a seat in accompany with the input of the excess shock at back crash is received by a pressure receiving body 26 of which the backward movement is controlled by a control means 32, and the backward movement of the pressure receiving body is permitted within a predetermined control range when the backward movement load inputted to the pressure receiving body exceeds the control load by the control means. An upper end of a seat back 12 supporting a head rest is forwardly moved by the amount corresponding to the backward movement of the pressure receiving body 26 against the buckling backward tilting of the whole seat back caused by the buckling deformation of a specific part, whereby the backward moving amount of the upper end of the seat back can be controlled at the buckling backward tilting of the seat back.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact absorbing seat for a vehicle which absorbs impact energy at the time of a rear impact and protects a seated person from the impact, and a seat back frame structure thereof.

[0002]

2. Description of the Related Art An impact-absorbing sheet that absorbs impact energy at the rear of a vehicle, such as a collision at the time of a rear-end collision or a collision at the time of back running, that is, a so-called rear collision, and protects a occupant from this impact, has been developed. Various types of vehicle seats are provided.

An example of this type of sheet is disclosed in, for example,
07-132767. In the seat having this configuration, a meandering reinforcing rib portion is provided on a part of the bracket of the reclining device, and the seat back with the buckling deformation at the reinforcing rib portion tilts backward to reduce impact energy at the time of a rear collision. It allows for absorption.

[0004]

As described above, this known seat cannot be rearwardly inclined due to the back tilt of a seat back accompanied by buckling deformation at a reinforcing rib provided on a part of a bracket of a reclining device. Is formed so as to absorb impact energy. However, since the seat back simply leans backward with the vicinity of the reinforcing rib provided on the bracket of the reclining device as a fulcrum, the upper end of the seat back located at a position distant from the fulcrum at the time of this buckling backward tilt. Is likely to be relatively large.

That is, in the known configuration, although the impact energy at the time of a rear collision is absorbed by the backward inclination of the seat back due to the buckling deformation of the reinforcing rib, the amount of rearward movement of the upper end becomes large. Therefore, there is no denying that a so-called whiplash movement caused by a sharp backward tilt of the head can be caused. In addition, if the amount of rearward movement of the upper end of the seatback is large, there is a possibility that the occupant's upper body may shift from the upper end of the seatback.

[0006] Thus, in this known construction, the absorption of the impact energy at the time of a rear collision is obtained under the buckling of the seat back, but the subsequent continued protection for the occupant is sufficient. There is no denying that they may disappear.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular shock absorbing sheet and a seat back frame structure thereof capable of continuously enhancing protection while absorbing shock energy at the time of a rear collision.

[0008]

In order to achieve this object, according to the vehicle impact absorbing sheet of the present invention, the rearward movement of the occupant due to the input of an excessive impact at the time of a rear collision is restricted by a predetermined restriction. When the rearward movement load inputted to the pressure receiving body exceeds the regulation load by the regulating means, the rearward movement of the pressure receiving body is possible within a predetermined range. Then, by tilting the upper end of the seat back supporting the headrest forward forward by an amount corresponding to the rearward movement of the pressure receiving body, contrary to the tilt of the seat back after buckling, the seat back tilts after buckling. The amount of rearward movement of the upper end of the seat back at the time can be suppressed.

Further, according to the seatback frame structure of the present invention, the seatback frame forming the skeleton of the seatback has a frame body having a pair of left and right end portions integrally formed at both ends of the upper end portion, and at least the upper end portion thereof. Under the fixing of the part, at least a pair of left and right plate-shaped side frames integrally disposed at the left and right ends of the frame main body are formed, and the pressure receiving body is provided at least at the waist of the seated person. At the upper and lower positions that can be aligned, it is erected and fixed between the left and right ends of the frame main body, and the left and right ends of the frame main body and the side frame are moved at the upper end of the side frame via predetermined regulating means. Below the fixed position, the pressure receiving body is connected and supported so as to restrict backward movement of the pressure receiving body.

[0010] The rearward movement of the occupant due to the input of an excessive impact at the time of a rear collision is received by the pressure receiving body, and when the rearward movement load inputted to the pressure receiving body exceeds the regulated load by the regulating means, Is moved backward within a predetermined range, and under the backward movement of the pressure receiving body, the upper end portion of the seat back frame is pivoted in a forward tilt direction with respect to the side frame around a position fixed to the side frame. It is possible.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 (A) and 2 (A), in a vehicle impact absorbing sheet 10 according to the present invention, a seat back 12 is tilted rearward under buckling deformation of a specific portion. The seat occupant is configured to be protected from the impact at the time of a rear collision by absorbing the impact energy due to the backward buckling.

In the embodiment of the present invention, for example, a weak portion 16 serving as a lightening hole is provided at a part of the rear end of the seat cushion frame 14, for example, as shown in FIG.
As shown in (A), the strength weak portion is buckled and deformed, whereby the seat back 12 can be tilted backward, that is, tilted after buckling.

This kind of strength weakened portion 16 buckles and deforms only under the impact at the rear of the vehicle, such as a collision at the time of a rear-end collision or a collision at the time of back running, so-called excessive impact energy generated at the time of a rear collision. It is formed so as to have a specific rigidity or higher that does not cause buckling deformation under a normal load.

In this embodiment, the lightening hole at the rear end of the seat cushion frame 14 is embodied as the weakened portion 16, but the present invention is not limited to this.
For example, the weak brittle portion may be formed by a known rib shape or the like. Further, the location is not limited to the rear end of the seat cushion frame 14, and may be provided on a part of the reclining device or the like.

Here, as can be seen from FIG. 3 in addition to FIG. 1 (A), in the present invention, a seat back frame 18, which forms the skeleton of the seat back 12, has a pair of upper and lower ends 20a. Frame body 2 integrally having left and right end portions 20b
0, and at least the upper end thereof is fixedly attached, for example, under welding, and integrally disposed on the left and right ends of the frame body,
It is formed with a pair of left and right plate-like side frames 22 that are fixed. Then, for example, a separate lower frame 24 is installed and fixed between the lower end portions of the pair of side frames 22, so that the seat back frame 18 is formed in a substantially square front shape.

The seat back 12 has a substantially square seat back frame 18 as a skeleton, and a seat pad is provided on the front surface of an installation member such as an S spring installed between left and right side frames 22. The seat pad and the seat back frame are formed by covering the frame with a trim cover. The basic structure of the seat back is well known and is not the gist of the present invention. Description is omitted.

In the seat back frame 18 of this type, the headrest holder 25 is fixed to the upper end portion 20a of the frame body 20 at a position separated from the left and right sides, and when the stay is inserted into the headrest holder, A headrest (not shown) can be attached to the upper end of the seat back 12.

In the present invention, the pressure receiving member 26
Are erected and fixed between the left and right ends 20b of the frame body at least in the vertical position where they can be aligned with the waist of the seated person, and the left and right ends of the frame body and the side frames 22 are regulated by the restricting means 32. Are connected and supported so as to be able to regulate the rearward movement of the pressure receiving body below the fixed position at the upper end of the side frame.

As the pressure receiving body 26, for example, a erection rod 28 erected and fixed between the left and right ends 20b of the frame main body.
And a plate-shaped pressure receiving plate 30 fixed to and supported on the front side of the erection rod and extending in the left-right direction.

Here, as can be seen from FIG. 4, the frame body 20 is provided with brackets 34 at the lower ends of the left and right ends 20b.
Under the tightening of the bracket and the side frame by the stepped bolt 38 inserted through the insertion hole 36 of the side frame 22, the connection between the lower end of the frame body and the side frame, There is support.
As shown in FIGS. 1 to 4, in the embodiment of the present invention, a guide hole capable of guaranteeing the backward movement of the stepped bolt 38 and regulating the movement range thereof.
By providing the pressure receiving member 40 at a position separated from the rear of the insertion hole 36 through which the stepped bolt is inserted,
Is formed as a restricting means 32 that can move the rearward and backward of the moving range.

As shown in FIGS. 1B and 4, the insertion hole 36 and the guide hole 40 are separated and defined by a separation piece 42. The separation piece 42 is formed in a front-rear width having rigidity necessary to resist a load equal to or less than an excessive impact energy generated at the time of a rear collision. The restricting means 32 is configured so that the movement of the stepped bolt 38 to the guide hole 40 can be guaranteed.

In the restricting means 32 having this configuration, the insertion hole
Since the lower ends of the frame body 20 and the side frames 22 are connected and supported under the screwing and tightening of the stepped bolts 38 via the 36, the front and rear positions between the lower ends of the frame body and the side frames In other words, the front and rear positions of the pressure receiving body 26 are normally defined as positions where stepped bolts are inserted into the insertion holes shown in FIGS. 1 (A), 1 (B) and 4.

In the vehicle impact absorbing sheet 10 of the present invention having the above-described structure, when a rear collision of the vehicle occurs, a rearward moving load of the upper body is received by, for example, almost the entire seat back frame 18. When the rearward moving load exceeds the rigidity of the weakened portion 16, the seat back 12 is moved from the position shown in FIG. 1A to the position shown in FIG. At the corresponding position, that is, after buckling.

At about the same time, the pressure receiving body 26 receives the rearward movement of the occupant's waist, and the rearward moving load applies the rigidity of the separation piece 42 between the insertion hole 36 and the guide hole 40 of the side frame.
That is, when the shear load is exceeded, as shown in FIG.
Since the rearward movement of the stepped bolt 38 from the insertion hole into the guide hole under the shearing of the separation piece is ensured, the stepped portion with respect to the side frame 22 within the range defined by the rear edge of the guide hole 40 is secured. Due to the backward movement of the bolt, the frame body 20 is positioned near the fixed position with the side frame at the upper end,
In other words, it is attempted to rotate in a forwardly inclined direction around the upper end side fixed position 44 as a center.

As can be seen from FIGS. 1B and 4, when the stepped bolt 38 is moved into the guide hole 40, the stepped bolt is separated from the guide hole by, for example, a side frame. Around the stepped bolt on the outer side of 22
This can be easily prevented under the arrangement of the support ring 46 having a diameter larger than the vertical width of the guide hole 40.

Here, for example, a V-notch 48 having an open front end may be formed in advance at a front end of the side frame 22 below a fixed position with respect to the left and right ends 20b of the frame main body. By forming such a V notch 48, the deformation of the side frame accompanying the rotation of the frame main body 20 in the forward tilt direction, that is, buckling deformation, is promoted, and the deformation load, that is, the forward tilt of the frame main body, Can be appropriately adjusted and set.

Since the forward tilt of the frame body 20 due to the deformation of the side frame 22 is caused by the generation of excessive impact energy at the time of a rear collision, the deformation load of the side frame 22 is It is preferably equal to the load.

As described above, according to the vehicular shock absorbing sheet 10 of the present invention, the seat back 12 is moved by the corresponding angle under the buckling deformation of the weakened portion 16 due to the generation of the rear impact impact energy. As a whole, the seat body tilts after buckling, and the rearward movement of the pressure receiving body 26 causes the seat body to rotate forward in the forward tilt direction with respect to the side frame 22, i.e., the passive forward tilting rotation causes the seat to rotate. The upper end of the back frame 18, that is, the upper end 20a of the frame body, moves forward against the overall buckling inclination of the seat back frame.

That is, according to the present invention, the seat back
It is possible to keep only the rearward movement amount of the upper end to a small width while securing the overall post-buckling inclination of 12, and the headrest inserted at the upper end of the seatback moves forward with the upper end of the seatback. As a result, an excessive rearward tilt of the seated person's head or the like in the rearward direction, that is, a whiplash motion, can be suppressed in succession to the absorption of the impact energy due to the rearward buckling of the seat back. Therefore, protection of the head and neck at the time of a rear collision can be ensured continuously while absorbing the impact energy.

By suppressing the amount of backward movement of the upper end of the seat back 12, the shock absorbing sheet absorbs the impact energy due to the back buckling of the seat back. This can prevent the occupant's upper body from shifting up, and from this point as well, it is possible to provide protection that is continued after buckling.

As described above, according to the vehicle shock absorbing sheet 10 of the present invention, the impact energy absorbing function at the time of a rear collision due to the buckling of the seat back 12 is not impaired, and the head and the like continued to be provided therewith. Since the protection is possible, the performance of protecting the occupant is further improved.

According to the seat back frame structure of the shock absorbing sheet of the present invention, the above-described shock absorbing operation of the seat back 12 can be performed smoothly and reliably.

Further, under the connection of the upper and lower ends, the side frames 22 are integrally provided on the left and right ends 20b of the frame main body 20, and the connection of the lower ends thereof is connected to the frame main body. It is sufficient that the pressure receiving member 26 provided at the lower end can be moved backward through the restricting means 32 so that the configuration of the seat back frame 18 itself does not become complicated.

Here, in the embodiment of the present invention, the V-notch 48 is provided in the side frame 22, but it is sufficient if the buckling deformation accompanying the backward movement of the pressure receiving body 26 can be ensured in the side frame. Depending on the shape of the frame itself, the thickness of the plate, and the like, there may be a case where even if the V notch is omitted, the frame body 20 can be tilted forward with respect to the side frame.

However, if a V-notch 48 is provided in the side frame 22 as in this embodiment, the buckling deformation, that is, the frame main body, regardless of the shape of the side frame itself or the condition of the plate thickness, etc. Since the forward tilting rotation of 20 can be secured, the operation accuracy is surely improved. And the V notch
By providing the 48, the buckling deformation portion on the side frame 22 is specified, and from this point, the reliability of the operation accuracy can be improved.

Further, by changing the size (length in the front-rear direction) of the V notch 48, the buckling start load of the side frame 22 can be adjusted and controlled. By appropriately selecting the shape in addition to the above, the shock absorbing performance of the shock absorbing sheet 10 can be easily controlled. That is, since the shock absorbing performance can be arbitrarily adjusted and set according to the characteristics of the seat itself and the characteristics of the vehicle to which the seat is mounted, it is possible to easily provide a shock absorbing sheet having excellent adaptability. .

In the embodiment of the present invention,
The upper end of the side frame 22 is fixed to the left and right side ends 22b of the frame body under welding, and the forward tilt rotation of the frame body 20 with respect to the side frame is obtained under the buckling deformation of the side frame. , Under the forward tilting rotation of the frame body,
It is sufficient to move the upper end portion 20a forward against the overall post-buckling inclination of the seat cushion frame 18, and the present invention is not limited to this. For example, the upper end portions of the side frame and the left and right end portions of the frame body may be used. By fixing the gap at one point with a fixing bolt, the center of forward rotation of the frame body with respect to the side frame may be defined as the fixing bolt.

However, in such a configuration, the rotation restricting force at the fixing bolt portion cannot be secured sufficiently large. Therefore, when this rotation restricting force is to be increased to about the fixing force by welding, the rotation restricting force is increased. It cannot be denied that the configuration and workability are complicated.

On the other hand, in the embodiment of the present invention, the side frame 22 and the left and right end portions 22 of the frame main body are provided.
b is fixed by welding or the like, and the frame body 20 is rotated forward by tilting under the buckling deformation of the side frame. It can be easily secured without any change.

Further, since the upper end side fixed position 25 has a rotation restricting force greater than that against a normal load,
Since the rear regulating force of the 26 can be distributed between the upper end side fixed position and the regulating means 32 at the lower end, the load burden is reduced, so that the configuration of the regulating means is also prevented from becoming complicated.

In the embodiment of the present invention,
The insertion hole 36 and the guide hole 40 formed separately by the separation piece 42
Regulating means for regulating the backward movement of the pressure receiving body 26 by combining a stepped bolt 38 inserted into the insertion hole.
Although it is sufficient to regulate the rearward movement of the pressure receiving body and to define the rearward movement range thereof, the pressure receiving body is not limited to the separation by the separating piece. The regulating means may be configured as a combination of the specified insertion hole, the guide hole, and the stepped bolt.

Further, in the embodiment of the present invention,
A combination of a mounting rod 28 erected and fixed between the left and right ends 20b of the frame body and a plate-shaped pressure receiving plate 30 fixed to and supported on the front side of the erection rod and extending in the left-right direction is formed by a pressure receiving body 26. However, the present invention is not limited to this as long as it can receive the rearward transfer load of the upper body of the occupant, particularly the waist, and is not limited thereto. The pressure receiving member may be formed only from the pressure receiving member.

However, the pressure receiving plate is
By combining 30, the shape of the portion facing the waist of the seated person can be obtained as a flat surface, so that the normal elastic support performance of the seating surface of the seat back can be reliably prevented from lowering.

In the embodiment of the present invention, a vehicle shock absorbing sheet to be mounted on an automobile is exemplified. However, the present invention is not limited to this, although it is suitable for automobiles. The present invention may be applied to a vehicle seat.

The embodiments described above are intended to explain the present invention, and do not limit the present invention in any way, and all modifications and alterations within the technical scope of the present invention are also included in the present invention. It goes without saying that it is included in the invention.

[0047]

As described above, according to the impact absorbing sheet for a vehicle according to the present invention, the seat back can be moved only by the corresponding angle under the buckling deformation at a specific position due to the generation of the impact energy of the rear collision. The upper end of the seat back moves forward against the overall back buckling of the seat back due to the forward forward movement accompanying the rearward movement of the pressure receiving body, as well as the overall buckling of the seat. It is possible to suppress only the amount of rearward movement of the upper end of the back to a small width while securing the overall post-buckling inclination of the back. By suppressing the amount of rearward movement of the upper end of the seat back, an excessive backward tilt of the head of the seated person rearward, that is, whiplash movement can be suppressed, and the upper body of the seated person on the upper end of the seat back can be suppressed. Since the displacement can be prevented, the protection of the head and the like at the time of a rear collision can be ensured continuously by absorbing the impact energy.

That is, according to the impact absorbing sheet for a vehicle of the present invention, it is possible to continuously protect the head and the like without impairing the impact energy absorbing function at the time of a rear collision due to the buckling of the seat back. Therefore, the protection performance for the occupant is further improved.

According to the seat back frame structure of the shock absorbing sheet of the present invention, the above-described shock absorbing operation in the seat back can be smoothly and reliably performed.

Further, under the connection of the upper and lower ends, the side frames are integrally disposed on the left and right ends of the frame main body, and the connection of the lower ends thereof is connected to the lower end of the frame main body. It is sufficient that the pressure receiving member provided is connected via a restricting means so that the pressure receiving member can move backward, so that the configuration of the seat back frame itself does not become complicated.

Further, the upper end of the side frame is integrally fixed to the left and right ends of the frame body, and a V notch having an open front end is provided at the front end of the side frame below the fixing position. If it is formed, the buckling deformation of the side frame itself and the buckling deformation at a specific location can be ensured irrespective of conditions such as the thickness of the side frame itself, so that the operation accuracy is reliably improved.

By changing the size of the V notch, the buckling start load of the side frame can be adjusted.
Since the control becomes possible, the shock absorbing performance of the shock absorbing sheet can be easily controlled by appropriately selecting the shape together with the restricting force of the restricting means. That is, since the shock absorbing performance can be arbitrarily adjusted and set according to the characteristics of the seat itself and the characteristics of the vehicle to which the seat is mounted, it is possible to easily provide a shock absorbing sheet having excellent adaptability. .

Further, if the restricting means is constituted by the insertion hole of the stepped bolt and the guide hole separated and defined behind the insertion hole, the rearward movement of the pressure receiving body can be achieved without complicating the structure. The movement range can be regulated smoothly and reliably.

Further, the combination of a mounting rod fixedly mounted between the left and right ends of the frame body and a plate-shaped pressure receiving plate fixed to and supported on the front side of the mounting rod and extending in the left-right direction, If the body is formed, the shape of the portion facing the waist of the occupant can be obtained as a flat surface, so that it is possible to reliably prevent the seating surface of the seat back from being deteriorated in elastic support performance at normal times.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an impact absorbing sheet for a vehicle according to the present invention in an initial state, and a partially enlarged view of a regulating unit.

FIG. 2 is a schematic perspective view of a partially broken vehicle impact absorbing sheet.

FIG. 3 is a schematic side view of the vehicle shock absorbing sheet and a partially enlarged view of a restricting means when an impact due to a rear collision occurs.

FIG. 4 is a schematic sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 10 Shock absorbing sheet for vehicle 12 Seat back 18 Seat back frame 20 Frame body 22 Side frame 26 Pressure receiving body 32 Restriction means 36 Insertion hole 38 Stepped bolt 40 Guide hole 48 V notch

Continued on the front page (72) Inventor Yasuhiko Kamei 3-2-1, Matsubara-cho, Akishima-shi, Tokyo F-term in Tachi-S Co., Ltd. (Reference) 3B084 EB05 EC01 3B087 CD02 CD03 CD05 CD02 DB05 DC05 DE10

Claims (5)

[Claims] 1. An impact for a vehicle in which a seatback is tilted backward under a buckling deformation of a specific portion, and a seated person is protected from an impact at the time of a rear collision by absorbing impact energy due to the buckling tilt. In the absorption seat, the back movement of the occupant due to the input of an excessive impact at the time of a rear collision,
When the rearward movement load inputted to the pressure receiving body exceeds the restriction load by the restriction means, the pressure receiving body is moved backward within a predetermined range when the rearward movement load input to the pressure receiving body is received by the pressure receiving body restricted by the predetermined restriction means. By tilting the upper end of the seat back supporting the headrest forward forward by an amount corresponding to the rearward movement of the pressure receiving body, contrary to the tilt of the seat back after buckling, the seat back tilts after buckling. Wherein the amount of rearward movement of the upper end of the seat back can be suppressed. 2. A vehicle impact for tilting a seat back backward under a buckling deformation of a specific portion and protecting a occupant from an impact at the time of a rear collision by absorbing impact energy due to the buckling rearward tilt. In the absorbent sheet, a seat back frame that forms a skeleton of the seat back has a frame main body integrally having a pair of left and right ends at both ends of an upper end portion; And a pair of left and right plate-shaped side frames integrally provided at the left and right ends, and a pressure receiving body is provided at an up and down position that can be aligned with at least the waist of the seated person. While being erected and fixed between the side end portions, the left and right end portions of the frame body and the side frame are located below the fixed position at the upper end portion of the side frame via predetermined regulating means, The rearward movement of the pressure body is connected and supported so that the rearward movement of the pressure body can be restricted, and the rearward movement of the seated person due to the input of an excessive impact at the time of a rear collision is received by the pressure receiving body, and the rearward movement load input to this pressure receiving body is controlled by the restricting means. When the regulation load is exceeded, the pressure receiving body is moved backward within a predetermined range, and under the rearward movement of the pressure receiving body, the upper end of the seat back frame, with the fulcrum around the fixed position with the side frame, A seat back frame structure for a vehicle shock absorbing seat, wherein the seat back frame structure is rotatable in a forward leaning direction with respect to a side frame. 3. An upper end of the side frame is integrally fixed to left and right ends of the frame main body, and a V notch having an open front end is provided at a front end of the side frame below the fixing position. The seat back frame structure of the impact absorbing sheet for a vehicle according to claim 2 formed. 4. When the frame body is tilted forward with respect to the side frame, the side frame and the left and right end portions of the main body frame are connected by being tightened with stepped bolts through insertion holes of the side frame. A guide hole for ensuring the movement of the stepped bolt and restricting its movement range is provided at a position separated from the insertion hole of the side frame through which the stepped bolt is inserted on the locus of movement of the stepped bolt in FIG. The seat back frame structure of a vehicle impact absorbing sheet according to claim 2 or 3, wherein the pressure receiving body is capable of moving backward in the rearward direction and restricting the moving range. 5. A mounting rod fixedly mounted between left and right ends of the frame body, and a pressure receiving plate fixed and supported on the front side of the mounting rod and extending in a left-right direction; The seat back frame structure of a vehicle impact absorbing sheet according to any one of claims 2 to 4, wherein the seat back frame structure is formed and arranged as a combination of: