JP2015150978A - Back frame of vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back frame of a vehicle seat which inhibits vibrations of a headrest during normal time while securing seating person's head support capability in a collision.SOLUTION: A headrest 50 may be attached to a back frame 31 of a vehicle seat, and the back frame 31 of the vehicle seat includes: an upper side portion 32a; a reinforcement member 35 provided below the upper side portion 32a so as to be arranged parallel to the upper side portion 32a; and a holder member 36 for attaching the headrest 50. The holder member 36 is disposed so as to span between the upper side portion 32a and the reinforcement member 35. A lower part of the holder member 36 is attached to the reinforcement member 35 through rubber cushions 61, 62. An upper part of the holder member 36 is located at the upper side portion 32a and disposed at the inner side of a cylindrical restriction member 37 which restricts tilting of the headrest 50 in a fore and aft direction.

Description

  The present invention relates to a back frame of a vehicle seat to which a headrest can be attached.

  In a vehicle seat provided with a headrest for supporting a seated person's head on the upper part of the seat back, vibration from the engine is transmitted to the headrest via the floor panel and the seat frame when the vehicle is running or idling. Here, a technique for suppressing headrest vibration by lowering the resonance frequency of the headrest by lowering the support rigidity of the headrest attachment member to the back frame and separating it from the resonance point of the floor panel is disclosed in Patent Document 1 below. .

JP2013-103551A

  In the prior art described in Patent Document 1, while securing the support rigidity of the headrest when the vehicle receives a collision from the rear (hereinafter referred to as a collision), the vehicle is traveling or idling (hereinafter referred to as a normal time). In addition, the vibration of the headrest is suppressed. For this reason, in order to lower the support rigidity of the headrest mounting member to the back frame, only one member of the two members over which the headrest mounting member is stretched is fixed. Therefore, the elastic modulus when the position of the headrest mounting member is changed with respect to the back frame can be reduced, but it is difficult to obtain a damping effect proportional to the speed of the position change. If the damping effect is small, even though the resonance frequency of the headrest can be lowered, the vibration magnification, which is the vibration transmission rate, increases, and the vibration suppressing effect is limited.

  The present invention was devised in view of the above points, and while maintaining the headrest support rigidity at the time of a collision, the vibration of the headrest caused by vibration from the engine during normal operation is reduced, and the resonance frequency of the headrest is reduced and the vibration magnification is increased. It is an object of the present invention to provide a back frame for a vehicle seat that can be reduced by reducing the height of the vehicle.

  A first aspect of the present invention is a vehicle seat back frame to which a headrest can be attached at an upper portion, and the back frame is provided in parallel with an upper frame member forming an upper side and a lower side of the upper frame member. And a headrest attachment member for attaching a headrest, the headrest attachment member being arranged to span the upper frame member and the reinforcement member, and the upper frame member of the headrest attachment member One of the locations spanned by the reinforcing member is attached via a vibration isolator, and the other location is in contact with each other when the headrest is tilted backward about the one location to suppress the tilt. It is set as the arrangement | positioning structure used as a state to carry out.

  According to the first aspect of the present invention, the headrest mounting member is disposed so as to span the upper frame member forming the upper side of the back frame and the reinforcing member provided in parallel to the lower side of the upper frame member. It is attached to either the frame member or the reinforcing member via a vibration isolator. Accordingly, the support rigidity of the headrest mounting member with respect to the back frame is reduced, and a damping effect is obtained when the headrest mounting member is displaced with respect to the back frame. As a result, during normal times, the resonance frequency of the headrest relative to the back frame is reduced, and at the same time, the vibration magnification is reduced, thereby suppressing the vibration of the headrest. Further, when the headrest is tilted backward with the other portion as the center, the other portion is brought into contact with each other to be in a state of suppressing the tilting. For this reason, at the time of a collision, it is possible to prevent the headrest that receives force from the seated person from being tilted backward, and to secure the support performance of the seated person's head.

  According to a second aspect of the present invention, there is provided the back frame according to the first aspect, wherein the anti-vibration material is such that the headrest attachment member is in the front-rear direction relative to the upper frame member or the reinforcing member. It is characterized by being arranged to allow movement by compressing and deforming.

  According to the second invention, in addition to the function and effect of the first invention, the vibration damping material is compressed and deformed in response to the movement of the headrest mounting member in the front-rear direction with respect to the back frame. It is demonstrated and the vibration of the headrest is suppressed efficiently.

  A third invention of the present invention is the back frame according to the first invention or the second invention, wherein the headrest mounting member has a structure in which a pair of pipe-shaped members are connected by a connecting member.

  According to the third invention, in addition to the operational effects of the first invention or the second invention, the headrest mounting member has a structure in which a pair of pipe-shaped members are connected by the connecting member. Assembling of members becomes easy.

  A fourth invention of the present invention is the back frame according to any one of the first to third inventions, wherein the upper frame member or the reinforcing member in the other portion is provided with the headrest mounting member. A restriction member is provided for restricting movement of a predetermined amount or more in the front-rear direction.

  According to the fourth invention, in addition to the operational effects of any one of the first to third inventions, the upper frame member or the reinforcing member at the other location has a predetermined amount or more in the front-rear direction of the headrest mounting member. Since the restricting member for restricting the movement is provided, it is possible to prevent the headrest from being excessively tilted in any direction.

  According to a fifth aspect of the present invention, there is provided the back frame according to the fourth aspect, wherein a vibration isolating material is disposed between the regulating member and the headrest mounting member.

  According to the fifth aspect, in addition to the function and effect of the fourth aspect, since the vibration isolator is disposed between the regulating member and the headrest mounting member, in addition to the damping effect of the vibration isolator at one location Thus, the damping effect of the vibration isolating material between the regulating member and the headrest mounting member is added, and the vibration of the headrest is further suppressed.

1 is a perspective view of a vehicle seat having a back frame according to a first embodiment of the present invention. It is a perspective view which shows the assembly method of the back frame which concerns on the said embodiment. It is a side view which shows the back frame and headrest which concern on the said embodiment. It is sectional drawing cut | disconnected and shown by the IV-IV line of FIG. It is sectional drawing cut | disconnected and shown by the VV line | wire of FIG. It is a graph explaining the vibration magnification of the headrest by the structure of the said embodiment. It is a figure which shows the holder attachment part of the back frame which concerns on 2nd Embodiment.

  1 to 6 show a first embodiment of the present invention. In each figure, each direction of the vehicle when the vehicle seat is attached to the vehicle floor is indicated by an arrow. In the following description, the description regarding the direction is made based on this direction.

In FIG. 1, the outer shape of the vehicle seat 10 is indicated by a two-dot chain line. The vehicle seat 10 includes a seat cushion 20 on which an occupant sits, a seat back 30 that serves as a back of the occupant, and a headrest 50 (see FIG. 3) that supports the occupant's head. The seat back 30 is connected to the rear end portion of the seat cushion 20, and the angle formed with respect to the seat back 30 can be adjusted by a pair of recliners 40 provided at the connecting portion. The pair of recliners 40 are connected by a rod 41 to be interlocked.

  The seat back 30 includes a metal back frame 31 having a substantially rectangular frame shape when viewed from the front as shown by a solid line in FIG. Furthermore, the seat back 30 has a pad material that is a cushion material that covers the back frame 31 and a skin material that is covered by the pad material as members that form an outer shape (indicated by a two-dot chain line in FIG. 1) including a backrest surface. doing. A headrest 50 is attached to the upper part of the seat back 30 to support the back of the seated person.

  The back frame 31 mainly includes an upper frame 32, a side frame 33, and a lower panel 34. These structural members are integrally connected to each other by welding to form a substantially rectangular frame shape. The side frame 33 is a plate-like member disposed in the vertical direction on the left and right, and ribs (standing walls) directed inward of the seat are provided at the front and rear ends. The upper frame 32 is a member obtained by bending a pipe having a circular cross section into a substantially U shape, and has both side portions 32b and an upper side portion 32a. Both side portions 32 b of the upper frame 32 are coupled to the upper ends of the side frames 33. The lower panel 34 is a member having a long plate shape, and is attached laterally inside the lower portions of the side frames 33. The upper side portion 32a corresponds to an “upper frame member” recited in the claims.

  A reinforcing member 35 is attached between the side portions 32 b of the upper frame 32. The reinforcing member 35 is a long strip-shaped member, and is disposed in a direction in which the width direction is the vertical direction, and is parallel to the upper frame 32. Both ends of the reinforcing member 35 in the longitudinal direction are welded and fixed to the rear sides of both side portions 32b of the upper frame 32, respectively. In addition, the reinforcing member 35 is configured such that the edges on both sides in the width direction are bent toward the front side in the longitudinal direction.

  A flat portion 32a1 is provided at the front portion of the upper frame 32 centering on a position away from the center in the left-right direction by half the distance between the stays 51 of the headrest 50. Here, a regulating member 37 having a U-shaped cross section is attached by welding. The regulating member 37 has a shape in which the upper bottom portions of the trapezoidal side wall portion 37b are connected by a rectangular front wall portion 37a, and the lower bottom portion of the side wall portion 37b is welded and fixed to the flat portion 32a1 of the upper frame 32. Yes. The cross section of the inner portion surrounded by the flat portion 32a1 of the upper frame 32, the front wall portion 37a of the restricting member 37, and both side wall portions 37b of the restricting member 37 is larger than the cross section of the holder 36b described later. Yes. That is, the cylindrical portion in the vertical direction formed by the regulating member 37 and the flat portion 32a1 of the upper frame 32 is dimensioned so that the holder 36b is loosely inserted.

As shown in FIG.1 and FIG.5, the holder member 36 is a member which connected the lower end part of a pair of holder 36b which is a square tube-shaped metal member with the connection member 36a. The holder 36b is a member in which a pair of side wall portions 36b2 are connected by a front wall portion 36b1 and a rear wall portion 36b3, and a resin headrest support 38 for inserting and supporting the stay 51 of the headrest 50 can be inserted and supported. It has become. The connecting member 36a is a plate-shaped member having an L-shaped cross section, and is fixed by welding by bending the left and right end portions thereof and contacting the lower end portions of the side wall portions 36b2 of both holders 36b. As shown in FIG. 2, holes 36 a 1 for attaching the holder member 36 to the reinforcing member 35 are provided at both ends in the left-right direction of the connecting member 36 a. The holder member 36 and the holder 36b correspond to a “headrest mounting member” and a “pipe-like member” recited in the claims.

  As shown in FIGS. 1, 2, and 4, the holder member 36 is attached to the reinforcing member 35 using a stepped bolt 60, a nut 64, and the like. At this time, the upper portions of both holders 36 b of the holder member 36 are inserted into a vertical cylindrical portion formed by a regulating member 37 attached to the upper frame 32 and a flat portion 32 a 1 of the upper frame 32. In this state, both the holders 36 b of the holder member 36 are arranged in a bridging manner between the upper frame 32 and the reinforcing member 35. A stepped bolt 60 is passed through two holes 35a for attaching the holder member 36 formed in the reinforcing member 35. The stepped bolt 60 is provided with a vibration isolating rubber 61, a hole 36a1 of the connecting member 36a, a vibration isolating rubber 62, and a washer 63. Then, the nut 64 is tightened. As a result, the holder member 36 is attached to the reinforcing member 35. The anti-vibration rubbers 61 and 62 correspond to the “vibration-isolating material” recited in the claims.

  As shown in FIG. 4, the stepped bolt 60 includes a head 60a, a large-diameter shaft portion 60b that is not threaded, and a small-diameter shaft portion 60c that is threaded. The anti-vibration rubber 61 is a ring-shaped part made of chloroprene rubber, and has a large diameter portion 61a and a small diameter portion 61b. The outer diameter of the large-diameter portion 61a is about 30% larger than the diameter of the head 60a of the stepped bolt 60, the inner diameter thereof is slightly larger than the diameter of the large-diameter shaft portion 60b of the bolt 60, and the thickness thereof is connected. The member 36a is about four times the plate thickness. The outer diameter of the small diameter portion 61b is slightly smaller than the diameter of the hole 36a1 of the connecting member 36a, the inner diameter thereof is slightly larger than the diameter of the large shaft portion 60b of the bolt 60, and the thickness thereof is the plate of the connecting member 36a. It is almost the same as the thickness. The anti-vibration rubber 62 is a ring-shaped part made of chloroprene rubber, and has the same outer diameter, inner diameter, and thickness as the large-diameter portion 61 a of the anti-vibration rubber 61. When the connecting member 36a is fastened and fixed to the reinforcing member 35 using the stepped bolt 60, the vibration isolating rubber 61, the vibration isolating rubber 62, the washer 63, and the nut 64, the connecting member 36a extends in the axial direction of the stepped bolt 60. In addition, it is attached to the reinforcing member 35 via a vibration-proof rubber also in a direction perpendicular thereto. In this state, the lower part of the holder member 36 is viscoelastically supported with respect to the back frame 31. Further, the compression rate of the anti-vibration rubber 61 and the anti-vibration rubber 62 when tightened and fixed using the nut 64 can be controlled by the length of the large-diameter shaft portion 60b of the stepped bolt 60.

  As shown in FIG. 5, the upper portions of both holders 36 b of the holder member 36 are surrounded by a flat portion 32 a 1 of the upper frame 32, a front wall portion 37 a and both side wall portions 37 b of the restricting member 37, through vibration-proof rubber 70. It is inserted and supported by a cylindrical part formed by the inner part. The anti-vibration rubber 70 is made of chloroprene rubber like the anti-vibration rubbers 61 and 62, and is a rectangular tube-shaped member. The outer shape of the cross section is slightly smaller than the cross section of the cylindrical portion formed by the inner portion surrounded by the flat portion 32a1 of the upper frame 32 and the front wall portion 37a and both side wall portions 37b of the restricting member 37. The shape is slightly smaller than the outer cross section of both holders 36b. Assembling is performed in a state where the upper portions of both holders 36b are inserted into the inner cylindrical portion of the vibration-proof rubber 70, and the upper portions of both holders 36b are connected to the flat portion 32a1 of the upper frame 32, the front wall portion 37a of the regulating member 37, and both side wall portions It is performed by inserting it into a cylindrical part formed by the inner part surrounded by 37b. In this state, the upper portion of the holder member 36 is viscoelastically supported with respect to the back frame 31. The anti-vibration rubber 70 also corresponds to “anti-vibration material” recited in the claims.

  The embodiment configured as described above has the following operational effects. In general, a vehicle floor panel resonates with an idling engine or the like at a specific frequency, and this vibration is a cushion frame or back frame 31 fixed to the floor panel regardless of whether an occupant is seated on the seat. Is also transmitted to the headrest 50 via. The headrest 50 has a higher resonance frequency as the support rigidity by the back frame 31 is higher. As shown in FIG. 6, the headrest vibrates by amplifying the vibration level of the floor panel as the resonance frequency is closer to the resonance point of the floor panel. In the diagram shown in FIG. 6, the resonance frequency of the floor panel during general engine idling is defined as f1. The resonance frequency of the headrest 50 of the conventional first back frame indicated by the alternate long and short dash line, in which the holder 36b is fixed to the upper frame 32 and the reinforcing member 35, is substantially the same as the above f1, and the vibration of the floor panel is reduced. 50 is most amplified and transmitted. Next, the resonance frequency of the headrest 50 of the other conventional second back frame indicated by the broken line, in which the holder 36b is fixed only to the reinforcing member 35, is f2 lower than f1, and the vibration of the headrest 50 at the frequency f1. The magnification can be lowered from the conventional point a to point b. The conventional second back frame is a technique disclosed in Patent Document 1, and this effect is produced because the support rigidity is lowered because the holder 36b is fixed only to the reinforcing member 35.

  On the other hand, in this embodiment, the lower part of the holder member 36 is attached to the reinforcing member 35 via the vibration isolating rubbers 61 and 62, and the upper part of the holder member 36 is attached to the upper frame 32 via the anti vibration isolating rubber 70. Therefore, the support rigidity is lowered and the damping effect by the vibration isolating rubbers 61, 62, and 70 works. Accordingly, as indicated by the solid line in the diagram of FIG. 6, the resonance frequency of the headrest 50 of the present embodiment is f2 lower than f1, and the vibration magnification is lower than that of the conventional second back frame shown by the broken line. It becomes. The vibration magnification of the headrest 50 at the frequency f1 can be lowered from the b point to the c point of the conventional second back frame. Further, in the present embodiment, the vibration magnification not only in the front-back direction but also in the up-down and left-right directions can be reduced. This is because when the lower part of the holder member 36 is attached to the reinforcing member 35 with the stepped bolt 60, the small-diameter portion 61b of the anti-vibration rubber 61 is interposed between the hole 36a1 of the connecting member 36a and the stepped bolt 60, and the holder member This is because the anti-vibration rubber 70 is interposed between the upper portion 36, the upper frame 32, and the regulating member 37. Furthermore, in the present embodiment, the upper part of the holder 36b is supported by the upper frame 32 through the anti-vibration rubber 70, so that excessive force is applied to the headrest 50 in the front-rear direction or the left-right direction during a collision or the like. Even if added, the seated person's head can be supported steadily. As described above, the vibration of the headrest 50 in the normal state can be suppressed while ensuring the head support performance of the seated person at the time of a collision or the like.

  7A and 7B show a second embodiment of the present invention. Regarding the same configuration as that of the first embodiment, the same reference numerals are given to the drawings, and the description thereof is omitted. A member corresponding to the upper frame 32 and the reinforcing member 35 in the first embodiment is an upper member 80. The upper member 80 is a metal plate-like member having a U-shaped cross section with the rear opened and having an upper surface portion 80a, a front surface portion 80b, and a lower surface portion 80c. Two rectangular holes 80a1 into which the holder 36b can be loosely inserted are provided at predetermined positions on the upper surface portion 80a so as to have a larger area than the cross section of the holder 36b. Two rectangular holes 80c1 into which the holder 36b can be loosely inserted are provided at predetermined positions in the lower surface portion 80c so as to have a larger area than the cross section of the holder 36b. The two holders 36b are welded together by a connecting member 136a, which is a metal plate-like member having a U-shaped cross section that opens downward at the lower end thereof. Between the connecting member 136a and the lower surface portion 80c of the upper member 80, the stepped bolt 60, the anti-vibration rubber 61, the anti-vibration rubber 62, the washer 63, and the nut 64 are provided at two places between the holders 36b as in the first embodiment. Are fastened and joined. That is, the relationship between the stepped bolt 60, the vibration isolating rubber 61, the vibration isolating rubber 62, the washer 63, the nut 64 and the lower surface portion 80c is the same as the stepped bolt 60, the anti vibration isolating rubber 61, and the anti vibration isolating rubber 62 in the first embodiment. The relationship between the washer 63, the nut 64, and the connecting member 36a is the same. Further, the relationship between the stepped bolt 60, the vibration isolating rubber 61, the vibration isolating rubber 62, the washer 63, the nut 64 and the connecting member 136a is as follows: the stepped bolt 60, the vibration isolating rubber 61, and the anti vibration isolating rubber 62 in the first embodiment. The relationship between the washer 63, the nut 64, and the reinforcing member 35 is the same. Further, an anti-vibration rubber 170 is provided between the upper portion of the holder 36b and the wall surface of the rectangular hole 80a1 of the upper surface portion 80a. The anti-vibration rubber 170 also corresponds to “anti-vibration material” recited in the claims.

  Also in the second embodiment as described above, the mounting support rigidity of the holder 36b with respect to the upper member 80 can be lowered, and the damping effect by the vibration isolating rubbers 61, 62, and 170 works as in the first embodiment. Accordingly, as indicated by a solid line in the diagram of FIG. 6, the resonance frequency of the headrest 50 of the present embodiment is f2 lower than the above f1, and the vibration magnification is lower than the other conventional techniques of the broken line. The vibration magnification of the headrest 50 at the frequency f1 can be lowered from the b point to the c point of the conventional second back frame. Furthermore, the vibration magnification not only in the front-rear direction but also in the vertical and horizontal directions can be reduced. The reason is the same as in the first embodiment. Further, as in the first embodiment, since the upper part of the holder 36b is supported by the upper surface part 80a through the anti-vibration rubber 170, excessive force is applied to the headrest 50 in the front-rear direction or the left-right direction during a collision or the like. Even if added to the head, the head of the seated person can be supported steadily. As described above, the vibration of the headrest 50 in the normal state can be suppressed while ensuring the head support performance of the seated person at the time of a collision or the like.

  In the second embodiment, the attachment method between the holder 36b and the upper surface portion 80a and the attachment method between the holder 36b and the lower surface portion 80c may be interchanged. That is, the upper part of the holder 36b may be coupled by the connecting member 136a and attached to the upper surface part 80a using the stepped bolt 60. Furthermore, both the upper part and the lower part of the holder 36b may be coupled by the connecting member 136a and attached to the upper surface part 80a and the lower surface part 80c using the stepped bolts 60, respectively. Further, the upper part and / or the lower part of the holder 36b may be coupled by the connecting member 136a and attached to the front surface part 80b using the stepped bolt 60.

As mentioned above, although specific embodiment was described, this invention is not limited to those structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example,
1. In the first embodiment and the second embodiment, the chloroprene rubber is used as the vibration isolating rubber 61, 62, 70, 170 as the material for the vibration isolating material, but not limited to this, a urethane elastomer or a felt material may be used.
2. In the first embodiment and the second embodiment, the stepped bolt 60 is used for attachment via the anti-vibration rubber. However, the present invention is not limited to this. Even if the compression ratio of the anti-vibration rubber can be controlled to a predetermined value, rivet caulking is also possible. Good.
3. In the first embodiment and the second embodiment, the mounting using the stepped bolt 60 is performed by aligning the axial direction of the stepped bolt 60 with the substantially front-rear direction of the vehicle. You may carry out according to the substantially left-right direction of a vehicle.
4). In the first embodiment and the second embodiment, the connecting members 36a and 136a of the holder 36b are set between the holders 36b. However, the present invention is not limited to this, and the connecting members are extended to the outside of the holder 36b and the end portions thereof are both side frames. You may attach to 33 using the stepped volt | bolt 60. FIG. According to this, the reinforcing member 35 can be omitted.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 20 Seat cushion 30 Seat back 31 Back frame 32 Upper frame 32a Upper side part (upper frame member)
35 Reinforcing member 36 Holder member (headrest mounting member)
36a Connecting member 36b Holder (pipe-shaped member)
37 Control member 50 Headrest 61 Anti-vibration rubber (anti-vibration material)
62 Anti-vibration rubber (anti-vibration material)
70 Anti-vibration rubber (anti-vibration material)
170 Anti-vibration rubber (anti-vibration material)

Claims (5)

  A back frame of a vehicle seat to which a headrest can be attached at an upper portion, wherein the back frame includes an upper frame member forming an upper side, a reinforcing member provided in parallel to the lower side of the upper frame member, and a headrest. A headrest mounting member for mounting, and the headrest mounting member is disposed so as to span between the upper frame member and the reinforcing member, and is spanned between the upper frame member and the reinforcing member of the headrest mounting member Among them, one part is attached via a vibration isolator, and the other part is arranged to be in contact with each other when the headrest is tilted backward with the one part as a center to suppress the tilting. A back frame characterized by   2. The back frame according to claim 1, wherein the vibration isolator moves with the headrest attachment member compressing and deforming the vibration isolator in the front-rear direction with respect to the upper frame member or the reinforcing member. A back frame characterized by being arranged to allow.   3. The back frame according to claim 1, wherein the headrest mounting member has a structure in which a pair of pipe-shaped members are connected by a connecting member.   The back frame according to any one of claims 1 to 3, wherein the upper frame member or the reinforcing member in the other portion has a predetermined amount or more in a front-rear direction of the headrest mounting member. A back frame comprising a regulating member for regulating movement. The back frame according to claim 4, wherein a vibration isolating material is disposed between the regulating member and the headrest mounting member.

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