JP2018144755A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which enables reduction of a load applied to an occupant's neck part.SOLUTION: A vehicle seat includes: a seat back frame F3 including a pair of left and right side frames 1L, 1R extending in a vertical direction and an upper frame 3 connecting upper parts of the side frames; and a headrest frame 7 coupled to the upper frame. Fragile parts 4, 100 having rigidity smaller than that of the other portion of the upper frame are provided in at least parts of the upper frame.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle seat mounted on an automobile or the like, and more particularly to a vehicle seat provided with a mechanism for reducing a load applied to an occupant when an impact load is applied.

  As a vehicle seat, there is a vehicle seat in which a weak portion is provided in a frame of a headrest that abuts on the head in order to reduce a load applied to the head of the occupant during a rear collision (for example, Patent Document 1). In the vehicle seat of Patent Document 1, the frame of the headrest is formed by a pipe, and includes a fragile portion that is deformed so as to have a flat cross section inside the headrest. At the time of a rear collision, the headrest supports the passenger's head from the rear side, and the fragile portion is plastically deformed, so that the load applied to the passenger's head is reduced.

Japanese Patent Application No. 5-12290

  However, the vehicle seat of Patent Document 1 is deformed so that the frame of the headrest is bent backward due to the load at the time of rear collision. Therefore, there is a possibility that the head moves backward with respect to the occupant's torso and a load is applied to the neck.

  This invention makes it a subject to provide the vehicle seat which can reduce the load added to a passenger | crew's neck in view of the above background.

  In order to solve the above problems, a seat back frame (F3) including a pair of left and right side frames (1L, 1R) extending in the vertical direction and an upper frame (3) connecting the upper portions of both side frames; A headrest frame (7) coupled to the upper frame, and at least a portion of the upper frame is provided with a weakened portion (4, 100) having a lower rigidity than other portions of the upper frame. Good.

  According to this configuration, the load applied to the occupant can be reduced by the deformation of the fragile portion. Further, since the upper frame is coupled to the seat back frame, the load from the occupant is easily transmitted to the fragile portion.

  In the above aspect, the headrest frame is connected to the upper frame between a left end portion (4L) located on the leftmost side and a right end portion (4R) located on the rightmost side of the weakened portion. It is good to be.

  According to this configuration, when the headrest frame moves rearward due to the load applied to the upper body of the occupant, the fragile portion is deformed, so that the load applied to the occupant's neck is reduced.

  In the above aspect, the headrest frame is connected via at least two or more connecting portions provided on the upper frame, and the leftmost connecting portion (51L) located on the leftmost side of the connecting portions and the left end It is good that a part is connected by the said weak part, and the right side connection part (51R) located in the rightmost side among the said connection parts, and the said right end part are connected by the said weak part.

  According to this configuration, the headrest frame easily moves according to the load, so that the fragile portion is more easily deformed, and the load applied to the occupant's neck is reduced.

  Further, in the above aspect, the left connecting portion and the right connecting portion of the upper frame may be connected by the fragile portion.

  According to this structure, since the weak part located behind a passenger | crew's neck becomes easy to deform | transform, the load added to a passenger | crew's neck is reduced more.

  In the above aspect, the headrest frame may be fixed to the upper frame.

  According to this configuration, since the load applied to the occupant's head is easily transmitted to the upper frame, the load applied to the occupant's upper body is further reduced.

  In the above aspect, the upper frame may be formed of a pipe-shaped member, and the weakened portion may be semicircular when viewed in cross section.

  According to this structure, a weak part can be comprised easily.

  In the above aspect, the front wall of the fragile portion is formed in a semicircular arc shape in a cross-sectional view, the rear wall is formed in a plate shape in a cross-sectional view, and the headrest frame is coupled to the front surface of the fragile portion. Good.

  According to this configuration, since the area of the portion where the headrest frame and the upper frame are coupled can be increased, the headrest frame and the upper frame can be easily coupled.

  In the above aspect, the upper frame may be formed of a pipe-shaped member, and the weakened portion may be flat when viewed in cross section.

  According to this configuration, the fragile portion can be easily configured by deformation of the upper frame. Further, the rigidity of the upper frame between the coupling portions can be made lower than that of a semicircle.

  In the above aspect, the upper frame may be formed of a pipe-like member, and an opening that penetrates toward the inside may be formed on a side surface of the fragile portion.

  According to this structure, the weak part for reducing the load added to a passenger | crew's neck part can be easily comprised by providing an opening part in an upper frame.

  In the above aspect, the opening may extend in the up-down direction at a substantially central position in the left-right direction of the upper frame.

  According to this configuration, when a load is applied to the occupant's neck, the load is applied to the occupant's neck by the deformation of the upper frame because the upper frame is bent rearward at a substantially central position in the left-right direction. The load applied to the cervix is reduced.

  In the above aspect, the headrest frame may be coupled to the front surface of the upper frame.

  According to this configuration, when a load is applied to the vehicle seat from the front, the upper frame is unlikely to come off the headrest frame.

  According to the above configuration, it is possible to provide a vehicle seat that can reduce the load applied to the neck of the occupant.

The perspective view of the vehicle seat which concerns on this invention 1 is an assembled perspective view of the vehicle seat of FIG. FIG. 2 is a front view of the seat back and a rear view of the vehicle seat when the back cover is removed The perspective view when the back upper frame and headrest frame of the vehicle seat which concern on this invention are seen from diagonally forward The perspective view when the back upper frame and headrest frame of the vehicle seat which concern on this invention are seen from diagonally back VI-VI sectional view of FIG. VII-VII sectional view of FIG. The perspective view of the back upper frame and headrest frame of the vehicle seat which concern on another embodiment The perspective view of the back upper frame and headrest frame of the vehicle seat which concern on another embodiment

  Embodiments of a vehicle seat according to the present invention will be described below with reference to FIGS. In the following description, the left and right sides and the inside and outside are determined based on the occupant seated on the vehicle seat. About the structure provided in right and left, a common number is attached | subjected, and when specifying left and right, the left or right character is attached | subjected to the name of a structure.

  As shown in FIG. 1, the vehicle seat S is a so-called full bucket seat having a seat cushion S1 and a seat back S2 in which a backrest S3 and a headrest portion S4 are integrally formed. The seat cushion S1 includes a seat cushion frame, a pad and an outer skin that are placed on the upper side of the seat cushion frame, and supports the occupant's buttocks and thighs. The seat cushion frame is formed in a frame shape by a pair of left and right cushion side frames F2 extending in the front-rear direction and a plurality of frames that connect the side surfaces inside the cushion side frames F2. The seat back S2 is formed with a pair of left and right vents S5 penetrating back and forth at a position corresponding substantially to the shoulder of the occupant.

  As shown in FIG. 2, the seat back S2 includes a seat back frame F3, a front cover C1 that covers the front side of the seat back frame F3, and a back cover C2 that is provided behind the seat back frame F3. . As shown in FIG. 2 and FIG. 3, the seat back frame F3 includes a pair of opposing left back side frame 1L and right back side frame 1R, and a back upper frame 3 connecting both the back side frames 1L and 1R, and A back lower frame 5 and a headrest frame 7 coupled to the back upper frame 3 are provided.

  Each of the backside frames 1L and 1R is formed of a metal plate material in a U shape facing inward in a horizontal sectional view and extends substantially vertically. The back side frames 1L and 1R are rotatably coupled to the rear end portions of the cushion side frames F2 via the reclining mechanism R at the lower end portions. The reclining mechanism R selectively holds the tilt angle of each of the back side frames 1L, 1R with respect to the cushion side frame F2 at an arbitrary angle. The left back side frame 1L and the right back side frame 1R are spaced apart in the left-right direction and form the width of the seat back S2. A plate-like erection member 8 is provided between the left and right backside frames 1L, 1R. The erection member 8 is supported by the left and right back side frames 1L and 1R through a predetermined elastic member 9 so as to be displaceable back and forth, and supports the back of the occupant with elastic force. In this embodiment, the erection member 8 is formed using a plate-like member, but is not limited to the plate-like member, and is a known configuration formed by a configuration that provides a lumbar support function (for example, a spring). It's okay.

  As shown in FIG. 3, a connecting member 10 for connecting the back side frames 1L, 1R and the back cover C2 is coupled to the rear walls of the lower ends of the left and right back side frames 1L, 1R.

  As shown in FIG. 3, the back upper frame 3 is formed by one continuous pipe member bent in an inverted U shape facing downward when viewed from the back, and connects the upper ends of both the back side frames 1L and 1R. ing. The back upper frame 3 has a shoulder portion 3A extending in the left-right direction and arm portions 3B extending downward from both ends of the shoulder portion, and inner surfaces of the corresponding back side frames 1L and 1R at the lower ends of the arm portions 3B. A part of the upper part overlaps and is joined by welding or the like. As shown in FIG. 6, the shoulder portion 3 </ b> A is provided with a fragile portion 4 that is deformed so as to form a semicircle having a wall surface facing rearward in a side view. The fragile portion 4 is formed over a predetermined range approximately at the center in the left-right direction of the shoulder portion 3A, as indicated by the oblique lines in FIG. In other words, the back upper frame 3 is deformed so as to have a semicircular arc-shaped wall surface facing forward and a planar wall surface facing rearward between the left end portion 4L and the right end portion 4R of the fragile portion 4. Yes. Further, sub-frames 6 are provided on the left and right ends of the upper portion of the back upper frame 3 to form portions that contact the shoulder of the occupant of the seat back S2.

  Wire-like sub-side frames 30LU and 30RU for connecting the back upper frame 3 and the left and right back side frames 1L and 1R are provided inside the left and right back side frames 1L and 1R and outside the installation member 8 in the left and right direction. It has been. Frame-side locking portions 32 that are paired on the left and right are provided at predetermined positions of the sub-side frames 30LU and 30RU. In the present embodiment, the frame side locking portion 32 is formed as a wire extending in the vertical direction. Further, below the left and right sub-side frames 30LU and 30RU, there are provided sub-side frames 30LD and 30RD which are formed in the shape of a wire having an annular shape and whose both ends are coupled to the left back-side frames 1L and 1R. Similarly, the frame side latching portions 32 are formed in the sub-side frames 30LD and 30RD. All the frame side locking portions 32 are arranged at a predetermined height above the connecting member 10.

  As shown in FIGS. 4, 5, and 7, the headrest frame 7 includes a first headrest frame 50, a second headrest frame 52 and a third headrest frame 54 coupled to the upper front side of the first headrest frame 50. Have The first headrest frame 50 has a pair of left and right first side frame portions 51L and 51R extending vertically and a first upper frame portion 51U connecting the upper ends of the first side frame portions and extending left and right. It is formed by a pipe member bent in a substantially inverted U shape facing downward when viewed from the front. The lower left ends and the lower right ends of the first side frame portions 51L and 51R are both disposed between the left end portion 4L and the right end portion 4R, and are bent in a substantially arc shape along the front side wall surface of the back upper frame 3. The left and right first side frame portions 51L and 51R are welded to the left connection portion 56L and the right connection portion 56R on the front surface of the back upper frame 3, respectively. At this time, the left connection portion 56L is disposed on the right side of the left end portion 4L, and the right connection portion 56R is disposed on the left side of the right end portion 4R. The first headrest frame 50 forms a part of the shape of the headrest portion S4 and also functions as a headrest pillar.

  The second headrest frame 52 includes a pair of left and right second side frame portions 53L and 53R coupled to the left and right first side frame portions 51L and 51R at the rear ends, and front ends of the second side frame portions 53L and 53R. A second front frame portion 53F that is connected and extends from side to side is provided. Due to the second side frame portions 53L and 53R and the second front frame portion 53F, the second headrest frame 52 has a generally inverted U shape when viewed from the front. The second side frame portions 53L and 53R are welded to the left and right inner surfaces of the first side frame portions 51L and 51R at the rear ends, respectively, and extend upward along the first side frame portions 51L and 51R. . Further, the second side frame portions 53L and 53R are bent with respect to the first side frame portions 51L and 51R, extend forward and leftward and rightward, then bend upward, and have a substantially L shape in a side view. There is no. The upper ends of the left and right second side frame portions 53L and 53R are joined by a second front frame portion 53F extending in the left-right direction to form a surface 51S extending in the up-down and left-right directions. The surface 51S of the second headrest frame 52 forms the front surface of the headrest portion S4 with which the occupant's head abuts.

  The third headrest frame 54 connects the left and right third side frame portions 55L and 55R joined at the rear ends to the surfaces facing the left and right inner sides of the left and right first side frame portions 51L and 51R, and the front ends thereof, A third front frame portion 55F extending left and right is provided. The third side frame portions 55L and 55R are the front surfaces of the first side frame portions 51L and 51R at the rear ends, respectively, and are connected to the first side frame portions 51L and 51R and the second side frame portions 53L and 53R. Is also welded to the bottom. The third side frame portions 55L and 55R respectively extend upward from the welded portions and bend, and extend obliquely forward and upward with respect to the first side frame portions 51L and 51R. The width in the left-right direction of the third front frame portion 55F is set to be wider than that of the second front frame portion 53F. The third front frame portion 55F abuts against the second front frame portion 53F from the rear, It is welded to the frame portion 53F. Due to the third side frame portions 55L and 55R and the third front frame portion 55F, the third headrest frame 55 has a generally inverted U shape when viewed from the front. The first headrest frame 50, the second headrest frame 52, and the third headrest frame 54 form a skeleton of the headrest portion S4.

  As shown in FIG. 2, the front cover C <b> 1 includes a pad member 36 that is a cushioning material that joins the seat back frame F <b> 3 from the front, and a skin material 37 that covers the front side of the pad member 36. A through hole 39 penetrating back and forth is formed at a position corresponding to the vent S5 of the pad member 36. Similarly to the pad member 36, an opening is formed in the skin material 37 at a position corresponding to the vent S5. A resin garnish 40 extending substantially in the rear is fitted in the opening of the skin material and the through hole 39 of the pad member 36. A plurality of locking claws (not shown) projecting in the inner circumferential direction are formed on the outer periphery of the rear end of the garnish 40.

  The back cover C2 is a resin plate-like member disposed along the back surface of the seat back S2, and is formed symmetrically. The back cover C <b> 2 includes a base portion 60 having a substantially square shape, and a head portion 61 that extends upward from the upper edge portion of the base portion 60 continuously to the base portion 60. The back cover C2 is coupled to the back surface of the seat back S2 so that the base 60 covers the backrest portion of the vehicle seat S and the head 61 covers the headrest portion S4 of the vehicle seat S. A pair of left and right through-holes 62 are formed in the upper portion of the base 60 at a position corresponding to the vent S5, and a cylindrical cover connecting portion 63 extends forward from the edge. A plurality of engagement holes, which are through-holes arranged so as to be aligned along the front end edge, are formed at the front end of the cover connecting portion 63. The engagement hole is disposed at a position where it engages with the locking claw of the garnish 40. A cover side locking portion 68 that is paired on the left and right sides of the back cover C2 is provided at the upper portion of the back cover C2 and at the substantially central portion in the vertical direction.

  A through hole 72 penetrating the back cover C2 back and forth is provided at a position below the base 60 of the back cover C2 and below the cover side locking portion 68 and corresponding to the screw hole 18 of the connecting member 10. ing. In the present embodiment, in order to improve the design, a countersink process for sinking the screw head is applied to the rear opening edge of the through hole 72.

  Next, an assembling method of the seat back S2 of the vehicle seat S will be described. As shown in FIG. 2, the back cover C <b> 2 is coupled to the seat back frame F <b> 3 by engaging the cover side locking portion 68 and the frame side locking portion 32. Further, the locking claw of the garnish 40 is fitted into the engagement hole of the back cover C2, and the front cover C1 and the back cover C2 are fixed to the seat back frame F3. Further, the lower part of the back cover C2 is fixed to the seat back frame F3 by passing a screw through the through hole 62 of the back cover C2 and coupling it to the screw hole 18 provided in the connecting member 10. As a result, the front cover C1 and the back cover C2 are joined to the seat back frame F3, and the seat back S2 is completed.

  Next, the effect of the vehicle seat S will be described. When an impact from the rear is applied to the vehicle body, an inertial force toward the rear is applied to the occupant. Due to the inertial force applied to the occupant, the occupant's neck moves backward, and a rearward load is applied to the upper portion of the seat back S2.

  As described above, the fragile portion 4 of the back upper frame 3 is formed in a semicircular shape in cross-sectional view, and the other part of the back upper frame 3 is formed in a circular shape in cross-sectional view. The fragile portion 4 is less rigid than the other portions. Therefore, the back upper frame 3 is bent backward at the fragile portion 4 and plastically deformed due to the backward load. Since the load is absorbed by the deformation of the fragile portion 4, the load applied to the occupant's neck is reduced.

  The left connection portion 56L and the right connection portion 56R are both provided between the left end portion 4L and the right end portion 4R, and the left connection portion 56L and the left end portion 4L, and the right connection portion 56R and the right end portion 4R are both fragile portions 4. Connected by. Therefore, the weak part 4 is deformed by the load applied to the upper body of the occupant, and the headrest frame 7 can be moved rearward. Since the load is absorbed by the deformation of the fragile portion 4, the load applied to the occupant's neck is reduced.

  In addition, since the left connecting portion 56L and the right connecting portion 56R are also connected by the fragile portion 4, when a rearward load is applied to the occupant's neck, the space between the left connecting portion 56L and the right connecting portion 56R. The fragile part 4 is also deformed. Therefore, the load applied to the occupant's neck is further reduced.

  Further, since the headrest frame 7 is fixed to the back upper frame 3, when the collision load is applied, the headrest frame 7 moves with respect to the backrest S3, and the possibility of applying an impact to the occupant is reduced. Furthermore, since the headrest frame 7 is fixed to the back upper frame 3, the load applied to the occupant's head is easily transmitted to the back upper frame 3, and the load applied to the upper body of the occupant is further reduced.

  Further, the fragile portion 4 is formed by deforming a pipe-like member constituting the back upper frame 3 so as to form a semicircular shape in a sectional view. Therefore, a weak part can be provided easily. Further, since the front wall of the fragile portion 4 is formed in a semicircular arc shape in a sectional view and the headrest frame 7 is coupled to the front wall, the area of the portion where the headrest frame 7 and the back upper frame 3 are coupled is large. It becomes easy to bond more firmly.

  Further, since the headrest frame 7 is coupled to the front surface of the back upper frame 3, when a load is applied to the vehicle seat S from the front, the back upper frame 3 is difficult to come off from the headrest frame 7.

  Since both the second headrest frame 52 and the third headrest frame 54 are coupled to the first headrest frame 50 at different locations, the load applied to the headrest portion S4 is applied to different locations of the first headrest frame 50. Is distributed. Therefore, the load is not concentrated and the first headrest frame 50 is not easily deformed.

  The second headrest frame 52 is joined at the rear end so as to extend forward with respect to the first headrest frame 50 to form a surface 51S. Therefore, the 2nd headrest frame 52 can support the load to the back added to a crew member's head. Since the third front frame portion 55F is welded to the rear side of the second front frame portion 53F, the load applied to the second headrest frame 52 is also transmitted to the third headrest frame 54 and is applied to the first headrest frame 50. Does not concentrate.

  An occupant's head seated in the rear seat may collide with the upper portion of the headrest portion S4 during a rear collision. As shown in FIG. 7, since the third headrest frame 54 is provided so as to extend forward and upward, the third headrest frame 54 can support a load from the upper portion of the headrest portion S4. Further, the second front frame portion 53F is welded to the front side of the third front frame portion 55F, and the upper surface of the second front frame portion 53F and the upper surface of the third front frame portion 55F are formed to be aligned. for that reason. The load applied to the upper portion of the headrest portion S4 is also applied to the second headrest frame 52, and the load applied to the first headrest frame 50 is not concentrated.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. As shown in FIG. 8, the weakened portion 104 may be formed as a portion in which the back upper frame 3 is deformed flat. Also in this case, the fragile portion 104 bends backward due to a backward load, so that the load applied to the occupant's neck is reduced. Moreover, since the rigidity can be lowered by the deformation of the back upper frame 3 as in the above embodiment, it is easy to provide the fragile portion 104.

  As shown in FIG. 8, when the fragile portion 104 is formed as a flatly deformed portion, as compared with the case where the fragile portion 4 is formed in a semicircular shape in a sectional view as shown in FIG. The rigidity of the fragile portion 104 is reduced. Therefore, when the fragile portion 104 is formed as a flatly deformed portion, the back upper frame 3 can be bent with a lower load, and the load applied to the occupant's neck can be reduced even with a lower load. it can. Thus, the threshold value of the load that causes deformation can be adjusted by the shape of the back upper frame 3.

  As shown in FIG. 9, the weakened portion 204 may be formed by forming an opening 200 having a predetermined size penetrating into the back upper frame 3. By forming the opening 200, the rigidity between the locations where the first side frame parts 51L and 51R are welded becomes smaller than the rigidity of the other parts of the back upper frame 3. Therefore, also in the back upper frame 3 shown in FIG. 9, when a backward load is applied, the back upper frame 3 bends backward, so that the load applied to the occupant's neck is reduced. In addition, since the rigidity can be reduced if the opening 100 is formed, it is easy to provide the fragile portion 204.

  Further, as shown in FIG. 9, the opening 200 is preferably formed so as to extend in the vertical direction at a substantially central position in the left-right direction of the back upper frame 3. According to this configuration, when a load is applied to the occupant's neck, the back upper frame 3 bends backward at a substantially central position in the left-right direction. Therefore, the load applied to the occupant's neck is effectively absorbed by the deformation of the back upper frame 3, and the load applied to the occupant's neck is easily reduced.

S2: Seat back S4: Headrest portion 1L, 1R: Back side frame 3: Back upper frame (upper frame)
4: weak part 4L: left end part 4R: right end part 7: headrest frame 56L: left side connection part 56R: right side connection part 104: weak part 204: weak part

Claims (11)

A pair of left and right side frames extending in the vertical direction, and a seat back frame including an upper frame connecting the upper portions of both side frames;
A headrest frame coupled to the upper frame;
The vehicle seat according to claim 1, wherein at least a part of the upper frame is provided with a weak part having a lower rigidity than the other part of the upper frame.   2. The vehicle according to claim 1, wherein the headrest frame is connected to the upper frame between a left end portion located on a leftmost side and a right end portion located on a rightmost side among the weakened portions. Sheet. The headrest frame is connected at at least two or more connecting portions provided on the upper frame,
The left side connection part located on the leftmost side of the connection part and the left end part are connected by the fragile part,
The vehicle seat according to claim 2, wherein the right-side connection portion located on the rightmost side of the connection portion and the right end portion are connected by the fragile portion.   The vehicle seat according to claim 3, wherein the left connecting portion and the right connecting portion of the upper frame are connected by the fragile portion.   The vehicle seat according to claim 4, wherein the headrest frame is fixed to the upper frame.   The vehicle seat according to any one of claims 2 to 5, wherein the upper frame is formed by a pipe-like member, and a cross section of the fragile portion has a semicircular shape.   The front wall of the fragile portion is formed in a semicircular arc shape in a cross-sectional view, the rear wall is formed in a plate shape in a cross-sectional view, and the headrest frame is coupled to the front surface of the fragile portion. 6. The vehicle seat according to 6.   The vehicle seat according to any one of claims 2 to 5, wherein the upper frame is formed by a pipe-like member, and a cross section of the fragile portion is flattened.   The upper frame is formed by a pipe-shaped member, and an opening portion penetrating inward is formed on a side surface of the fragile portion. The vehicle seat described.   The vehicle seat according to claim 9, wherein the opening extends in a vertical direction at a substantially central position in a horizontal direction of the upper frame.   The vehicle seat according to any one of claims 1 to 10, wherein the headrest frame is fixed to a front surface of the upper frame.

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