JP2001190355A - Headrest structure of automobile seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headrest structure of an automobile seat which effectively prevents a whiplash injury of an occupant when the automobile is struck from behind. SOLUTION: A supporting member 16 is inserted into a headrest body 15 from outside. The supporting member 16 has a pair of fitting parts 19 for fitting to a seat back 3 outside of the headrest body 15, and a receiving surface structure part 20 which continues from the pair of fitting parts 19 for receiving backward movement of the head of the occupant H inside the headrest body 15. The receiving surface structure part 20 and the pair of fitting parts 19 are set so that the receiving surface structure part 20 has an angle θinclining to the front side of the automobile body based on the vertical direction when they are used. Thereby, the receiving surface structure part 20 holds, from the upper side, an axial force (tension) of the neck generated as the neck is bent backward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest structure for a vehicle seat.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open Publication No. 7-11456, a headrest structure for a vehicle seat is designed to absorb a shock at the time of a collision or the like so as to reduce an adverse effect on an occupant and various parts of the seat. In which a core material made of a bead foam molded product is provided,
As disclosed in Japanese Patent Publication No. 1404, there is a headless body in which a core material having a low rebound resilience is filled in order to avoid a spring bag.

[0003]

However, none of the above-mentioned headrest structures has been sufficiently studied as to factors as a cause of whiplash, and furthermore, the relationship between these factors has not been sufficiently studied. It has not yet been prevented.

The present invention has been made in view of the above circumstances, and a technical problem of the present invention is to provide a headrest structure for an automobile seat that effectively prevents an occupant from whiplash during a rear collision of a vehicle. is there.

[0005]

According to the present invention (the first aspect of the present invention), there is provided a vehicle seat having a headrest body in which a support member is inserted from the outside. In the headrest structure, the support member has an attachment portion attached to the seatback side outside the headrest body, and a receiving surface configuration portion that is continuous with the attachment portion and receives rearward movement of the occupant's head in the headrest. The receiving surface constituting portion and the mounting portion are configured such that, in a use state, the receiving surface constituting portion has an angle that inclines forward of the vehicle body from the vertical direction. Preferred embodiments of the first aspect are as described in the second to fourth and eighth aspects.

In order to achieve the above technical object, according to the present invention (an invention of claim 5), in a headrest structure for an automobile seat in which a support member is inserted from outside into a headrest body, The upper part of the main body is configured to have a lower rebound resilience than the lower part of the headrest main body. Preferred embodiments of the fifth aspect are as described in the sixth to ninth and eighteenth aspects.

In order to achieve the above technical object, according to the present invention (invention of claim 10), in the headrest structure for an automobile seat in which a support member is inserted from the outside into the headrest body, The member has a pair of mounting portions mounted on the seat back side outside the headrest main body, and a receiving surface constituting portion continuous with the pair of mounting portions and receiving rearward movement of the occupant's head in the headrest main body, The receiving surface component is rotatably supported by the pair of mounting portions while a rotation support position is located between an upper edge and a lower edge of the receiving surface component. Preferred embodiments of the tenth aspect are as described in the 11th to 13th and 18th aspects.

In order to achieve the above technical object, according to the present invention (an invention of claim 14), in the headrest structure for an automobile seat in which a support member is inserted from the outside into the headrest body, A member having an attachment portion attached to the seatback side outside the headrest body, and a receiving surface component portion that is continuous with the attachment portion and that receives rearward movement of an occupant's head in the headrest; And the mounting portion are set such that the receiving surface configuring portion has an angle of inclination toward the vehicle body front side from the vertical direction in a use state, and the receiving surface configuring portion is flexed and deformed as compared with the mounting member. The configuration is easy. Preferred embodiments of the fourteenth aspect are as described in the fifteenth to seventeenth and eighteenth aspects.

[0009]

According to the first aspect of the present invention, the receiving surface constituting portion and the mounting portion are set such that the receiving surface constituting portion has an angle inclining toward the front of the vehicle body from the vertical direction in the use state. Therefore, at the time of vehicle rear collision, based on the angle between the receiving surface component and the mounting portion, the receiving surface component presses the axial force (tension) of the neck generated as the vehicle bends backward from above, The axial force on the occupant's neck can be reduced without significantly deteriorating other factors acting on the neck. Therefore, it is possible to effectively prevent the occupant from having whiplash during a rear collision of the vehicle. According to the second aspect of the present invention, since the mounting portion and the receiving surface forming portion are formed by bending the rod-shaped member, the mounting portion and the receiving surface forming portion can be formed very simply by the rod-shaped member. Become.

According to the third aspect of the present invention, since the receiving surface constituting portion has the bulging portion bulging inward from the peripheral edge of the receiving surface constituting portion toward the receiving surface constituting portion. The rearward movement of the occupant's head can be reliably received based on the bulging portion. According to the invention of claim 4, since the upper edge of the receiving surface constituting portion reaches near the upper end portion of the headrest main body in the headrest main body,
In the upper position, the axial force (tension) of the neck generated as the vehicle leans backward is suppressed from the upper side based on the inclined receiving surface constituting portion, and the axial force of the occupant's neck is reduced.
It can be further reduced. Therefore, it is possible to further increase the certainty of preventing the occupant from whiplash at the time of a vehicle rear collision.

According to the fifth aspect of the present invention, the upper portion of the headrest main body has a lower rebound resilience than the lower portion of the headrest main body. Therefore, the generated axial force (tension) of the neck is suppressed from above, and the above-mentioned claim 1 is claimed.
The same operation and effect can be obtained. According to the invention of claim 6, the support member has a pair of mounting portions for mounting to the seat back outside the headrest main body, and a receiving portion which is continuous with the pair of mounting portions and receives rearward movement of the occupant's head in the headrest main body. A pair of mounting portions and a receiving surface forming portion are formed by bending a rod-shaped member, and the receiving surface forming portion bulges downward from an upper edge of the receiving surface forming portion. Since the bulging portion has a bulging portion, the bulging portion bends rearward with the receiving surface constituting portion as a fulcrum. By pressing down the force (tension) from above, the same operation and effect as in the first aspect can be obtained.

According to the seventh aspect of the present invention, the receiving surface constituting portion and the pair of attaching portions are set such that the receiving surface constituting portion has an angle inclining toward the front side of the vehicle body from the vertical direction in a use state. In this case, the axial force (tension) of the neck, which is generated by bending backward, is suppressed from the upper side by the inclination of the receiving surface constituting portion in addition to the bending of the bulging portion. In comparison with the above, it is possible to further increase the certainty of preventing the occupant from whiplash at the time of a vehicle rear collision. According to the invention of claim 8, since the rebound resilience of the filler in the headrest body is set to be lower in the upper part of the headrest body than in the lower part of the headrest body,
Based on the difference in the resilience of the filler in the headrest body, the axial force (tension) of the neck generated as the user leans backward is suppressed from above, and the same operation and effect as in claim 1 can be obtained. Become. According to the ninth aspect of the present invention, the support member is attached to the seat back outside the headrest main body, and the receiving surface constituting portion is continuous with the mount portion and receives rearward movement of the occupant's head in the headrest main body. Since the receiving surface constituting portion and the mounting portion are set such that the receiving surface constituting portion has an angle of inclination toward the front side of the vehicle body from the vertical direction in the use state, the inside of the headrest main body is The axial force (tensile force) of the neck, which is generated as the back is bent, is suppressed from the upper side by the inclination of the receiving surface constituting portion, in addition to the difference in the rebound resilience of the filler.
As compared with the case of the above, the reliability of preventing the occupant from whiplash at the time of the vehicle rear collision can be further enhanced.

According to the tenth aspect, the support member is
A receiving surface component that has a pair of mounting portions that are mounted on the seat back side outside the headrest body, and a receiving surface component that is continuous with the pair of mounting portions and that receives rearward movement of an occupant's head within the headrest body; Is rotatably supported by the pair of mounting portions while the rotation support position is located between the upper edge and the lower edge of the receiving surface constituting portion. The rim and the lower edge quickly and accurately receive the occupant's head at two points, so that the neck moment can be reduced together with the axial force of the neck generated as the vehicle leans back. For this reason, it is possible to increase the certainty of preventing the occupant from whiplash at the time of a vehicle rear collision. According to the eleventh aspect of the present invention, the receiving surface constituting portion is formed by the rod-shaped member so as to have the upper edge portion and the lower edge portion extending in a relationship parallel to the lateral direction. With the upper edge portion and the lower edge portion, it is possible to obtain the same operation and effect as the above-mentioned claim 10.

According to the twelfth aspect of the present invention, the front surface of the receiving surface component has a curved surface close to the rear portion of the occupant's head. The head can be received quickly and accurately with two points,
The neck moment can be reduced together with the neck axial force generated as the user leans backward. For this reason, it is possible to increase the certainty of preventing the occupant from whiplash at the time of a vehicle rear collision. According to the thirteenth aspect of the present invention, since the receiving surface forming portion is formed of resin, the receiving surface forming portion having the curved front surface is easily and accurately formed, and the occupant head is provided on the front surface of the receiving surface forming portion. Can be received more quickly and accurately with two-point support.

According to the fourteenth aspect of the present invention, the receiving surface constituting portion and the mounting portion are set such that the receiving surface constituting portion has an angle inclining to the front side of the vehicle body from the vertical direction in the use state. Since the surface constituting portion is more easily deformed and deformed than the mounting member, based on the bending deformation (plastic deformation) of the receiving surface constituting portion, it rises to a predetermined collision load with a relatively high gradient at the beginning of the collision. And then the desired crash energy absorption characteristics for the neck that is maintained at that predetermined crash load condition can be approached. According to the invention of claim 15, the mounting portion and the receiving surface forming portion are formed by bending a rod-shaped member, and the receiving surface forming portion is formed by a rod-shaped member smaller than the mounting portion. The relative ease of bending of the receiving surface constituting portion is ensured based on the rod-shaped member having a small portion, and the same operation and effect as those of claim 14 can be obtained.

According to the sixteenth aspect of the present invention, the receiving surface forming portion has a bulging portion which bulges inward from the peripheral edge of the receiving surface forming portion toward the receiving surface forming portion. Is thinner than the other elements of the support member, based on the relatively thin bulging portion, specifically, the bulging portion can be easily bent and deformed. Based on the bending deformation of the bulging portion, it is possible to obtain the same operation and effect as in the fourteenth aspect.

According to the seventeenth aspect of the present invention, the thickness of the headrest body on the front side of the receiving surface constituting portion is smaller than that on the rear side of the receiving surface constituting portion, based on the receiving surface constituting portion. As a result, the head of the occupant is quickly received by the receiving surface component during the rear collision of the vehicle, and the receiving surface component is plastically deformed. The collision energy can be absorbed.

According to the eighteenth aspect of the present invention, in the use state, the upper portion is used for the seat back which moves forward at the time of a rear collision of the vehicle. Accordingly, the headrest body also moves forward, so that the gap between the occupant's head and the headrest body can be quickly reduced, and the function of the headrest can be effectively and effectively exerted.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1
Is a seat device 1 using the headrest structure according to the embodiment. The seat device 1 includes a seat cushion 2, a seat back 3, and a headrest 4.

The seat cushion 2 comprises a cushion body 5
And a pair of base members 6 provided on both left and right sides of a rear portion of the cushion body 5. Each base member 6 is movably engaged with a guide rail 7 extending in the vehicle front-rear direction, and the cushion body 5 is movable in the front-rear direction by the base member 6 being guided by the guide rail 7. The front and rear positions of the cushion body 5 can be adjusted by a known seat position adjusting mechanism (not shown).

The seat back 3 is rotatably supported by the base members 6 via a pair of left and right support plates 8. The seat back 3 has a seat back frame 9 inside, and the seat back frame 9 bends a pipe material into a rectangular shape (an annular shape),
A pair of left and right upright cylinders 10 and a pair of left and right upright cylinders 1
An upper cylinder portion 11 connects the upper cylinder portion 0 to the upper cylinder portion, and a lower cylinder portion 12 connects the pair of left and right upright cylinder portions 10 at the lower portion. A pair of headrest holders 13 are fixed to the upper cylindrical portion 11, and the pair of headrest holders 13 are fixed at a central portion in the longitudinal direction of the upper cylindrical portion 11 (a central portion in the left-right direction in FIG. 2). Are arranged at intervals. Side panels 14 are respectively provided on the pair of upright cylinder portions 10 so as to project forward, and the support plates 8 are attached to the respective side panels 14. The lower end of each support plate 8 is supported by the rear end of the base member 6 so as to be able to move up and down. A spring member (not shown) is interposed between each support plate 8 and the base member 6, and each support plate 8 is urged in a direction of falling forward, while each support plate 8 is The posture (standing state) can be adjusted by a known seat posture adjusting mechanism, whereby the posture of the seat back 3 with respect to the cushion body 5 can be adjusted.

The headrest 4 includes a headrest body 15
And a support member 16. Headrest body 1
5 is filled with a core material (not shown) as a filler, and the core material is covered with a skin (not shown). The support member 16 has a pair of mounting portions 19 and a receiving surface constituting portion 20 formed by a rod-shaped member (for example, one using a metal material, a resin material, or the like). The pair of mounting portions 19 are inserted into the headrest body 15 from the outside in parallel at a shorter interval than the width of the occupant head H, and their outer ends are respectively fitted and held in the headrest holders 13. Have been. The receiving surface constituting portion 20 includes side rod portions 21 extending continuously from the entry portions of the pair of mounting portions 19 to the upper side of the headrest main body 15 in the headrest main body 15, and horizontal rods connecting the both side rod portions 21. And a portion 22 that forms (partitions) a receiving surface 23 as if it could receive the occupant's head H. In the present embodiment, the receiving surface forming section 20 has a receiving surface 23 to reinforce the function as the receiving surface.
A bulging portion 24 bulging inward is provided. This bulge 24
Extends downward from the horizontal bar portion 22 while being juxtaposed with the side bar portions 21, and the diameter of the bulging portion 24 is smaller than the diameter of each of the side bar portion 21 and the horizontal bar portion 22. The bulging portion 24 is relatively easily bent with the horizontal bar portion 22 as a fulcrum (see the phantom line in FIG. 4). For this reason, when the bulging portion 24 is flexed, the bulging portion 24 is moved from the distal end side (lower end side) to the base end side (upper end side).
It is intended to show the characteristic that the repulsive force gradually increases toward. The receiving surface forming portion 20 is bent at a predetermined angle α with respect to the pair of mounting portions 19. The predetermined angle α between the receiving surface forming portion 20 and the pair of mounting portions 19 is such that when the outer ends of the pair of mounting portions 19 are fitted and held in the headrest holder 13, the receiving surface forming portion 20 becomes vertical. It is set so as to have an inclination angle θ inclined to the front side of the vehicle body with respect to the line G. Of course, in this setting, the comfort of the occupant during normal operation is also taken into consideration.

In the first embodiment, in order to effectively prevent the occupant from whiplash during a rear collision of the vehicle, the inclination of the receiving surface constituting portion 20 and the flexibility of the bulging portion 24 are set. Is to be used in combination. In the use state, when the receiving surface forming portion 20 has an inclination angle θ that inclines forward of the vertical line G toward the vehicle body,
The axial force (tension) of the neck, which is generated as the receiving surface constituting portion 20 is bent back, is suppressed from above, and the axial force of the occupant's neck is reduced.
This is because other factors acting on the neck can be reduced without significantly deteriorating.

The above contents are based on the following findings. That is, as a cause of whiplash, as shown in FIG. 5, the neck shear force Fxu, the neck shear force Fxd, and the neck axial force Fz
u, neck axial force Fzd, neck moment Mu, neck moment Md
It is considered that such factors are involved, and taking these factors into consideration, the change of each of the above-described components was examined by changing the inclination angle of the plate body using the receiving surface constituting portion 20 as a plate. Can be obtained. In this case, a low resilience core material having a thickness of 40 mm was used. In FIG. 6, each element of the plate as the receiving surface constituting unit 20 is normalized by a value in a vertical state (vertical state). According to the result shown in FIG. 6, the plate is tilted forward. The axial force Fzu on the neck according to
The axial force Fzd under the neck has been reduced. This is considered to be due to the effect of reducing the tension generated as the neck bends backward by pressing it from above. On the other hand, although the moment on the neck Mu tended to increase somewhat, other elements showed almost no tendency to increase. An experiment similar to the above was carried out by using a vertically parallel frame as the receiving surface constituting part 20 (upper and lower intervals of 100 mm).
Was also performed, but also in this case, as shown in FIG. 7, the same tendency as in the above case was shown. For this reason, based on the above knowledge, the receiving surface forming unit 20
The inclination of the (mainly, both side bar portions 21) itself and the bulging portion 24
The neck is pressed from the upper side by utilizing the characteristic of the resilience of the bulging portion 24 which becomes larger toward the upper side based on the flexibility. Therefore, in this embodiment,
Although the inclination of the receiving surface constituting portion 20 and the flexibility of the bulging portion 24 are combinedly used, one of these may be used alone.

FIG. 8 shows the second embodiment, and FIGS. 9 and 10 show the third embodiment.
Embodiment, FIGS. 11 to 13 are the fourth embodiment, FIGS. 14 and 15 are the fifth embodiment, FIGS. 16 to 18 are the sixth embodiment,
19 and 20 show a seventh embodiment. In each of the embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The second embodiment shown in FIG. 8 is a modification of the first embodiment. In the second embodiment, the horizontal bar portion 22 is formed so as to horizontally straddle the entire portion between both side bar portions 21. As a result, the receiving surface constituting portion 20 is reinforced, and at the time of a vehicle rear collision, the occupant head H can be more firmly pressed from above by the receiving surface constituting portion 20.

In the third embodiment shown in FIGS. 9 and 10, as the core material 25 as a filler in the headrest body 15, two different materials having different rebound resiliences are used. As the core material 25a in the upper portion of the headrest body 15, a material having a low rebound resilience is used, and the core material 2a in the lower portion of the headrest body 15 is used.
As 5b, a material having a higher resilience than the resilience of the core material 25a is used, and the headrest 4 is relatively rigid on the upper side and flexible on the lower side. This allows
As shown in FIG. 10, at the time of a vehicle rear collision, the repulsion force of the upper portion of the headrest 4 is smaller than that of the lower portion (the lower portion is more easily elastically deformed (compressed)), and substantially. As in the case of the first embodiment, a state where the occupant's head H is pressed from above can be realized. Also in the second embodiment, the receiving surface forming portion 20 is inclined forward of the vertical line G with an inclination angle θ. The portion H is pressed from above. Note that FIG.
Reference numeral 26 denotes an epidermis.

In the fourth embodiment shown in FIGS. 11 to 13, the receiving surface constituting portion 20 is rotatably supported by a pair of mounting portions 19. That is, this fourth
In the embodiment, the pair of mounting portions 19 are inserted into the headrest body 15 in a state where the interval is longer than the occupant's head H, and each upper portion thereof receives the receiving surface constituting portion 20. , Are continuously connected with a back 27 extending horizontally while projecting rearward. On the other hand, the receiving surface constituting portion 20 is formed in a rectangular shape by using a rod-shaped member (for example, a metal material, a resin material, or the like).
The rods 28 on both sides of the receiving surface component 20 are located between the upper bar 29 and the lower bar 30 of the receiving component 20 on the front side of the back 27 of the pair of mounting portions 19.
Are rotatably supported by the pair of mounting portions 19 while being positioned. This is because the upper rod portion 29 and the lower rod portion 30 of the receiving surface constituting portion 20 quickly and accurately receive the occupant's head H at two points during a vehicle rear collision, and the axial force of the neck generated as the vehicle leans backward. And the on-neck moment can both be reduced.

The above contents are based on the following findings. That is, the cause of the whiplash was studied from the viewpoint of reducing the whiplash, and when the occupant's head H was pressed with two upper and lower supports, the axial forces Fzu, Fzd of the neck and the moment Mu on the neck were reduced. As shown in FIG. 13, it has been found that the neck moment Mu is greatly reduced as the contact timing difference between the two points is shortened. For this reason, in the fourth embodiment, the receiving surface forming portion 20 is rotatably supported by the pair of mounting portions 19 in order to reduce the contact timing difference between the two points with the occupant head H.

The fifth embodiment shown in FIGS. 14 and 15 is a modification of the fourth embodiment. In the fifth embodiment, the receiving surface component 20 is formed in a bucket shape using resin, and has a curved surface 31 near the rear of the occupant head H on the front surface of the receiving surface component 20. . As a result, the fourth
As in the case of the embodiment, at the time of the vehicle rear collision, the receiving surface forming portion 20
The head of the occupant can be quickly and accurately received at two points on the front surface of the vehicle, and the neck moments Mu as well as the axial forces Fzu and Fzd generated as the user leans backward can be reduced.

In the sixth embodiment shown in FIGS. 16 to 18, a high-strength pipe is used as the pair of mounting portions 19, and one rod-like member is bent to the pair of pipes 19 in a substantially U-shape. The formed receiving surface constituting portion 20 is fitted and held. The receiving surface forming portion 20 and the pair of pipes 19 are set such that the receiving surface forming portion 20 has an inclination angle θ that inclines forward of the vertical line G toward the vehicle body in use. However, compared to the pair of pipes 19, it is more flexibly deformed and easily deformed. Thereby, based on the bending deformation (plastic deformation) of the receiving surface constituting portion 20, at the beginning of the collision, the vehicle is started up to a predetermined collision load with a relatively high gradient, and thereafter, the state of the predetermined collision load is maintained. To the desired collision energy absorption characteristic (see FIG. 18).
In the present embodiment, as shown in FIG. 17, the thickness L1 on the front side of the receiving surface forming portion 20 is set to be the thickness L2 on the rear side of the receiving surface forming portion 20 with reference to the receiving surface forming portion 20.
It is set to be thinner than that. by this,
At the time of a vehicle rear collision, the occupant's head H is promptly received by the receiving surface forming portion 20, and the receiving surface forming portion 20 is plastically deformed, so that the desired collision energy absorption characteristics (see FIG. 18) are obtained. The collision energy can be absorbed.

In the seventh embodiment shown in FIGS. 19 and 20, it is assumed that the headrest 4 according to each of the above embodiments is used, and the headrest 4 is integrated with the movement of the seat back 3 during a vehicle rear collision. The headrest 4 can be quickly and effectively received by moving the vehicle head forward and upward. That is, in the seventh embodiment, the movable adjustment mechanism 32 is provided between the support plate 8 and the side panel 14 so as to exert the above function. In the movable adjustment mechanism 32, as shown in FIG. 19, an arc-shaped guide slit 33, a locking pin 34, and a shaft hole 35 are formed on the support plate 8 in order from the upper side to the lower side, and upward toward the rear. The side panel 14 is provided with an engaging pin 36 and a hole 37 in order from the upper side to the lower side. While the engaging pin 36 is inserted into the guide slit 33, the link 38 is relatively rotatably fitted into the shaft hole 35 with the shaft 39 formed at one end thereof. The end passes through the hole 37 and the nut 40
Are rotatably supported by bolts 41 screwed into the bolts. Further, a mainspring spring 42 is interposed between the shaft portion 39 of the link 38 and the locking pin 34, and the other end of the link 38 is attached forward based on the urging force of the mainspring 42. Accordingly, the seat back 3 is also urged to be at the initial normal position (the state shown in FIG. 1). For this reason, as shown in FIG. 20, when the input load X acts on the seat back 3 from the vicinity of the occupant's waist toward the rear at the time of the vehicle rear collision, the entire seat back 3 resists the urging force of the mainspring, The headrest 4 rotates around the rotation center located above the load input unit, and accordingly, the headrest 4 moves forward and upward as shown by the phantom line in FIG. As a result, in addition to the functions of the headrest according to each of the above-described embodiments, the head H of the occupant can be more quickly and effectively received based on the movement of the headrest 4.

Although the embodiments have been described above, the present invention includes the following aspects. 1) The bulging portion 24 is bulged inward not only from the upper side of the receiving surface constituting portion but also from the side or the like. In this case, the bulge 24
This is because the rearward movement of the occupant head H can be reliably received. 2) To make the upper edge of the receiving surface constituting portion 20 as close as possible to the upper edge of the headrest body 15. This is because the axial force of the neck can be effectively suppressed from above.

It is to be noted that the object of the present invention is not limited to what is specified, but also includes providing what substantially corresponds to what is described as preferred or advantageous.

[Brief description of the drawings]

FIG. 1 is a side view showing a seat device using a headrest structure according to a first embodiment.

FIG. 2 is a front view illustrating a seat device using the headrest structure according to the first embodiment.

FIG. 3 is a front view showing a headrest structure according to the first embodiment.

FIG. 4 is an explanatory view showing the operation of the headrest structure according to the first embodiment.

FIG. 5 is a diagram showing elements that cause whiplash.

FIG. 6 is a characteristic diagram showing a change in axial force and the like of a neck when a plate body is used as a receiving surface component and the arrangement angle of the receiving surface component is changed.

FIG. 7 is a characteristic diagram showing a change in axial force and the like of a neck when an arrangement angle of the receiving surface forming portion is changed by using a receiving surface forming portion having two upper and lower frames.

FIG. 8 is an explanatory view showing a headrest structure according to a second embodiment.

FIG. 9 is an explanatory view showing a headrest structure according to a third embodiment.

FIG. 10 is a repulsive force characteristic diagram of upper and lower core materials in a headrest.

FIG. 11 is an explanatory view showing a headrest structure according to a fourth embodiment.

FIG. 12 is a longitudinal sectional view showing a headrest structure according to a fourth embodiment.

FIG. 13 is a characteristic diagram showing a relationship between a timing difference between two-point support with respect to the head and a moment on the neck.

FIG. 14 is an explanatory view showing a headrest structure according to a fifth embodiment.

FIG. 15 is a longitudinal sectional view showing a headrest structure according to a fifth embodiment.

FIG. 16 is a partial cross-sectional front view showing a headrest structure according to a sixth embodiment.

FIG. 17 is an explanatory view showing the operation of the headrest structure according to the sixth embodiment.

FIG. 18 is a characteristic diagram showing desired collision energy absorption characteristics of the receiving surface constituting portion.

FIG. 19 is an explanatory view showing a seat device using the headrest structure according to the embodiment.

FIG. 20 is an operation state diagram of the seat device according to FIG. 19;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat device 3 Seat back 4 Headrest 15 Headrest main body 16 Support member 19 Mounting part 20 Receiving surface constituent part 23 Receiving surface 24 Swelling part 25 Core material 25a Core material 25b Core material 32 Movable adjustment mechanism O Rotation support position θ Tilt angle G plumb line

Claims (18)

[Claims] 1. A headrest structure for a vehicle seat in which a support member is externally inserted into a headrest body, wherein the support member is attached to a seatback side outside the headrest body, and the attachment portion is provided. And a receiving surface component for receiving the rearward movement of the occupant's head in the headrest body, wherein the receiving surface component and the mounting portion are in use so that the receiving surface component is more vertically than A headrest structure for an automobile seat, wherein the headrest structure is set so as to have an angle inclined toward the front side of the vehicle body. 2. The headrest structure for an automobile seat according to claim 1, wherein the mounting portion and the receiving surface forming portion are formed by bending a rod-shaped member. 3. The receiving surface component according to claim 2, wherein the receiving surface component has a bulging portion that protrudes inward from the periphery of the receiving surface component. Car seat headrest structure. 4. The headrest structure for an automobile seat according to claim 1, wherein an upper edge of the receiving surface constituting portion extends to a vicinity of an upper end portion of the headrest main body in the headrest main body. 5. A headrest structure for a vehicle seat in which a support member is externally inserted into a headrest body, wherein an upper portion of the headrest body has a lower rebound resilience than a lower portion of the headrest body. A headrest structure for a vehicle seat. 6. The headrest body according to claim 5, wherein the support member has a pair of mounting portions for mounting to a seatback outside the headrest main body, and is continuous with the pair of mounting portions and behind the occupant head in the headrest main body. A receiving surface component for receiving the movement, wherein the pair of mounting portions and the receiving surface component are formed by bending a rod-shaped member, and the receiving surface component is formed from an upper edge of the receiving surface component. A headrest structure for an automobile seat, comprising a bulging portion bulging downward. 7. The receiving surface forming part and the pair of mounting parts according to claim 6, wherein the receiving surface forming part is set to have an angle inclining to a front side of the vehicle body from a vertical direction in a use state. And a headrest structure for an automobile seat. 8. The headrest body according to claim 5, wherein a resilience of the filler in the headrest body is set to be lower in an upper portion of the headrest body than in a lower portion of the headrest. Characteristic headrest structure for automotive seats. 9. The headrest assembly according to claim 8, wherein the support member is attached to a seatback side outside the headrest body, and a receiver that is continuous with the attachment part and receives rearward movement of an occupant's head in the headrest body. A surface configuration part, wherein the receiving surface configuration part and the mounting part are set so that the receiving surface configuration part has an angle inclining toward the vehicle body front side from the vertical direction in a use state. A headrest structure for an automobile seat characterized by the following. 10. A headrest structure for a vehicle seat in which a support member is externally inserted into a headrest body, wherein the support member is attached to a seatback side outside the headrest body, and A receiving surface component that is continuous with the pair of mounting portions and receives rearward movement of the occupant's head within the headrest body; the receiving surface component provides a rotational support position with an upper edge and a lower edge of the receiving surface component; A headrest structure for an automobile seat, wherein the headrest structure is rotatably supported by the pair of mounting portions while being positioned between the edge and the edge. 11. The receiving surface forming portion according to claim 10, wherein the receiving surface constituting portion is formed by a rod-shaped member so as to have an upper edge portion and a lower edge portion extending in a relationship parallel to the lateral direction. Car seat headrest structure. 12. The headrest structure for an automobile seat according to claim 10, wherein a front surface of the receiving surface forming portion has a curved surface close to a rear portion of an occupant's head. 13. The vehicle seat headrest structure according to claim 12, wherein the receiving surface constituting portion is formed of a resin. 14. A headrest structure for a vehicle seat in which a support member is externally inserted into a headrest body, wherein the support member is attached to a seatback side outside the headrest body, and the attachment portion is provided. And a receiving surface component for receiving the rearward movement of the occupant's head in the headrest, wherein the receiving surface component and the mounting portion are in use in a state where the receiving surface component is more vertically than the vertical direction. A headrest structure for an automobile seat, wherein the headrest structure is set to have an angle inclined forward, and wherein the receiving surface constituting portion is more easily bent and deformed than the mounting member. 15. The mounting part and the receiving surface forming part according to claim 14, wherein the mounting part is formed by bending a rod-shaped member, and the receiving surface forming part is formed by a rod-shaped member thinner than the mounting part. And a headrest structure for an automobile seat. 16. The bulging portion according to claim 15, wherein the receiving surface forming portion has a bulging portion that bulges inward from the periphery of the receiving surface forming portion toward the receiving surface forming portion. The headrest structure for a vehicle seat, wherein the headrest structure is thinner than other elements of the support member. 17. The headrest body according to claim 14, wherein a thickness of a front side of the headrest main body is smaller than a thickness of a front side of the reception surface main body with respect to the receiving surface main body. A headrest structure for an automobile seat, wherein the headrest structure is set as follows. 18. The headrest structure for a vehicle seat according to claim 1, wherein the headrest structure is used for a seatback whose upper portion moves forward at the time of a rear collision of the vehicle in a use state.