Vehicle seat

Abstract

To provide a vehicle seat device which enables replacement of a weight and an elastic member for adjusting and changing vibration control characteristics and achieves good mountability of a damper case to a seat.SOLUTION: A dynamic damper D comprises: a damper case 17 formed by first and second case half bodies 17A, 17B which are separably coupled to each other to define a damper chamber 17C; a weight 15 housed in the damper chamber 17C; and an elastic member 16 disposed between the weight 15 and an inner surface of the damper chamber 17C so as to allow vibration of the weight 15. In the damper case 17, attachment parts 24A, 24B which are attached to two positions at left and right sides of a frame 12 of a seat S are formed. The frame 12 is disposed avoiding a portion between an upper surface of the damper case 17 and an inner surface of the seat S facing the upper surface.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a vehicle seat having a dynamic damper attached to a frame of the seat to be installed in the vehicle. T Regarding improvements. [Background technology]

[0002] Such a vehicle seat To In the dynamic damper, a dynamic damper composed of a housing, a weight that is accommodated in the housing so that it can vibrate, and an elastic member that is interposed between the weight and the housing is known, as disclosed in Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-242986 A Summary of the Invention [Problem to be solved by the invention]

[0004] The vehicle seat disclosed in the above Patent Document 1 To In the dynamic damper in the above, after the weight and elastic member are accommodated in the housing, the housing is integrated as a whole in a manner that cannot be disassembled, so that once the dynamic damper is assembled, even if it is necessary to adjust or change the vibration damping characteristics, the weight and elastic member cannot be replaced with those having different characteristics, and a new dynamic damper must be manufactured, which is uneconomical. Moreover, since the housing is not provided with a portion for mounting to the seat, a special mounting tool such as a band must be used to mount the housing to the seat, and the mounting work is also troublesome.

[0005] The present invention relates to The dynamic damper includes a weight that is supported by the elastic sheet and has a center of gravity that is offset from the center of the dynamic damper in at least one of the front-rear direction and the up-down direction of the seat, and the weight is formed in at least one of the shapes that are asymmetrical in the front-rear direction and the up-down direction of the seat. The vehicle seat To The purpose is to provide. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides Equipped with a dynamic damper inside the seat Vehicle seat To Leave, The dynamic damper includes a pad including an elastic sheet that is elastically deformable and that constitutes a part of the dynamic damper, and a weight that constitutes a part of the dynamic damper and is supported by the elastic sheet, and whose center of gravity is set at a position offset from the center of the dynamic damper in at least one of the front-rear direction and the up-down direction of the seat, and the weight is formed in at least one of a shape that is asymmetrical in the front-rear direction and the up-down direction of the seat. The first feature of this system is that

[0007] In addition to the first feature, the present invention also provides: The center of gravity of the weight is located above the center of the weight in the up-down direction. The second feature is that

[0008] Furthermore, in addition to the first or second characteristic, the present invention further comprises: The weight is formed so that the thickness in the front-rear direction and / or the width in the left-right direction of the seat gradually increases upward. The third feature is that

[0009] Furthermore, the present invention relates to No. 1~ The third feature Either In addition, The weight is a flat hexahedron extending in the front-rear direction of the seat. This is the fourth characteristic.

[0010] Furthermore, in addition to any one of the first to fourth features, the present invention provides The rear surface of the weight in the seat front-rear direction is formed into a curved surface protruding rearward. The fifth feature is that

[0011] Furthermore, the present invention relates to No. 1~ Fifth feature Either In addition, The dynamic damper has a damper case that constitutes an outer shell, and the weight housed inside the damper case, and the damper case is formed by curving the outer shell to fit the shape of the weight. The sixth feature is that

[0012] Furthermore, in addition to any one of the first to sixth features, the present invention provides The elastic sheet is wrapped around the weight so as to overlap the entire surface thereof and is housed together with the weight in the damper case. The elastic sheet is formed by four sheet pieces projecting from a central portion of a rectangle facing the rear surface of the weight in the seat front-rear direction, and the sheet pieces do not cover a part of the front surface of the weight in the seat front-rear direction. This is the seventh characteristic.

[0013] Furthermore, in addition to any one of the first to seventh features, the present invention provides The elastic sheet is interposed in a compressed state between an outer surface of the weight and an inner surface of the damper case that faces the outer surface and constitutes an outer shell of the dynamic damper. The eighth characteristic is that

[0014] Furthermore, the present invention has a ninth feature in addition to any one of the first to eighth features, in that the seat is composed of a seat cushion, a seat back, and a headrest, the seat cushion has a seat cushion frame, the seat back has a seat back frame and is connected to the seat cushion frame via a pivot so as to be able to recline, and the headrest is composed of a headrest frame, the pad covering a surface of the headrest frame, and a headrest skin.

[0015] Furthermore, in addition to the ninth feature, the present invention has a tenth feature in that the headrest comprises: the headrest frame including a main rib member supported by the seat back and extending in the vertical direction of the seat; a cushion member that is arranged inside the headrest skin, supports the weight, is formed of elastically deformable urethane and is fixed to the headrest frame by the adhesive strength of the urethane itself; and the elastic sheet that is arranged inside the headrest skin, configures the pad together with the cushion member, and is formed of urethane separately from the cushion member. Effect of the Invention

[0016] This issue Ming According to the characteristics, The seat has a dynamic damper inside the headrest.In a vehicle seat, The headrest includes a headrest pad including an elastic sheet that is elastically deformable and that constitutes a part of the dynamic damper, and a weight that constitutes a part of the dynamic damper and is supported by the elastic sheet, and the weight has a center of gravity that is offset from the center of the headrest in at least one of the front-rear direction and the up-down direction of the seat, and the weight is formed in at least one of a front-rear asymmetric shape and a up-down asymmetric shape. The vehicle seat To It can be configured. [Brief description of the drawings]

[0017] [Figure 1] 1 is a side view of an automobile seat device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of part 2 (the area around the headrest) of FIG. [Diagram 3] 3 is a view taken from the arrow 3 in FIG. 2. [Figure 4] 4 is a view seen from the arrow 4 in FIG. 2. [Diagram 5] Cross-sectional view taken along line 5-5 in Figure 3. [Figure 6] FIG. 4 is a perspective view corresponding to FIG. 3 . [Figure 7] FIG. 7 is an exploded perspective view of the dynamic damper in FIG. 6 . [Figure 8] 4A to 4C are explanatory diagrams illustrating a method for molding a cushion member of a headrest using a foam material. [Figure 9] FIG. 4 is a front view corresponding to FIG. 3 and showing a second embodiment of the present invention. [Figure 10] FIG. 1 is a perspective view of a headrest according to a first embodiment of the present invention. [Figure 11] FIG. 4 is a perspective view of an automobile seat device according to a second embodiment of the present invention. [Figure 12] FIG. 11 is a perspective view of an automobile seat device according to a third embodiment of the present invention. [Figure 13] FIG. 11 is a perspective view of an automobile seat device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] First, a first embodiment of the present invention will be described with reference to Figures 1 to 8. In the following description, front, rear, left and right are defined based on the automobile to which the present invention is applied.

[0019] In Fig. 1, an automobile seat S comprises a seat cushion 2, a seat back 3, and a headrest 4. The seat cushion 2 has a seat cushion frame 6 having a plurality of support legs 7, 7 formed at its lower part, and the support legs 7, 7 are fixed to the floor F of the automobile.

[0020] A pair of left and right brackets 8 protruding upward are connected to the rear end of the seat cushion frame 6, and a seat back frame 10 of the seat back 3 is connected to these brackets 8 via a pivot 9 so as to be able to recline.

[0021] A pair of left and right support cylinders 11, 11 are fixed to the upper end of the seat back frame 10, and the headrest 4 is supported by these support cylinders 11, 11 so that it can be raised and lowered and can be fixed in place.

[0022] As shown in Figures 2 to 6, the headrest 4 is configured in a teardrop shape by a headrest frame 12, a urethane foam cushion member 13 supported by the headrest frame 12, and a skin 14 covering the surface of the headrest frame 12, and a dynamic damper D is attached to the headrest frame 12.

[0023] The headrest frame 12 is made by bending pipe material, and is composed of a pair of left and right main frame members 12a, 12a supported by the pair of support tubes 11, 11, upper frame members 12b, 12b bent forward from the upper ends of the main frame members 12a, 12a, a pair of left and right front vertical frame members 12c, 12c bent downward and extending from the front ends of the upper frame members 12b, 12b, and a front cross frame member 12d that integrally connects the lower ends of the front vertical frame members 12c, 12c to each other. A reinforcing cross bar 19 having a smaller diameter than the pipe material is welded to the left and right front vertical frame members 12c, 12c so as to bridge them. Thus, a cushion member 13 is formed from the upper parts of the main frame members 12a, 12a to the front cross frame member 12d so as to encase the headrest frame 12, and this cushion member 13 is covered with a skin 14.

[0024] Before forming the cushion member 13, the dynamic damper D is attached using the front vertical bone members 12c, 12c and the front horizontal bone member 12d. The dynamic damper D is composed of a weight 15, an elastic sheet 16 that wraps the weight 15 so as to overlap its entire surface, and a damper case 17 having a damper chamber 17C that houses the weight 15 and the elastic sheet 16. The headrest frame 12 is disposed so as to avoid the portion between the upper surface of the damper case 17 and the inner surface of the skin 14 that faces the upper surface. The weight 15 is supported in all directions by the damper case 17 via the elastic sheet 16. The elastic sheet 16 constitutes the pad P of the headrest 4 together with the cushion member 13. do.

[0025] 2, 5 and 7, the weight 15 is made of cast iron and is a hexahedron flattened in the front-rear direction, with its front surface 15f formed as a convex curved surface close to a plane, and its rear surface 15r formed as a curved surface that protrudes rearward more than the front surface 15f. Furthermore, the weight 15 is formed so that its thickness in the front-rear direction and / or its width in the left-right direction gradually increase upward, so that the center of gravity G of the weight 15 occupies a position higher than the center C of the weight 15.

[0026] The elastic sheet 16 is made of urethane foam, and consists of four sheet pieces 16b-16e protruding from a rectangular central portion 16a corresponding to the rear surface 15r of the weight. When wrapping the weight 15 with this elastic sheet 16, the front surface 15f of the weight 15 is placed on the central portion 16a of the elastic sheet 16, and then the four sheet pieces 16b-16e are each erected and folded toward the rear surface 15r of the weight 15, and are adhered to the front surface 15f with double-sided adhesive tape 18. The weight 15 thus wrapped with the elastic sheet 16 is housed in a damper case 17, which is divided into two parts, front and rear. At that time, As shown by the dotted lines in FIG. 3, a portion of the seat front surface 15f in the front-rear direction remains uncovered by the sheet pieces 16b to 16e. The elastic sheet 16 is interposed in a compressed state between the outer surface of the weight 15 and the inner surface of the damper chamber 17C that faces the outer surface. This prevents the elastic sheet 16 from shifting inside the damper chamber 17C, keeps the weight 15 in a predetermined position at all times, and suppresses unnecessary movement of the weight 15, ensuring a predetermined vibration damping function.

[0027] As shown in Figures 2 to 7, the damper case 17 has a shape similar to the external shape of the weight 15, and therefore has a box shape that is flat in the front-to-rear direction. Its front wall 17f is formed into a curved surface that is close to a flat surface corresponding to the front surface 15f of the weight 15, and its rear wall 17r is formed into a curved surface that is curved so as to protrude significantly rearward corresponding to the rear surface 15r of the weight 15.

[0028] The damper case 17 is divided into a first case half 17A on the front side and a second case half 17B on the rear side, and a damper chamber 17C capable of accommodating a weight 15 wrapped in an elastic sheet 16 is defined between the first and second case halves 17A, 17B. Each of the case halves 17A, 17B is molded from synthetic resin.

[0029] The first and second case halves 17A, 17B are formed so that the distance A (see FIG. 2) between the vertical side of the weight 15 and the inner surface of the damper chamber 17C that faces this side with the elastic sheet 16 in between increases upward. In other words, the distance A increases with increasing distance from the support point 9 of the vibration system consisting of the seat back 3 and the headrest 4. In the illustrated example, in order to place importance on damping the front-rear vibration of the vibration system, the first and second case halves 17A, 17B are formed so that the distance A in the front-rear direction between the weight 15 and the inner surface of the damper chamber 17C increases in the direction away from the support point 9, i.e., upward.

[0030] Further, a fitting groove 20 and a fitting protruding wall 21 are formed on one and the other of the mating surfaces of both case halves 17A, 17B, which can be fitted together surrounding the damper chamber 17C, and a plurality of elastic connecting claws 22, 22... protruding outward are formed at the tip of the fitting protruding wall 21, and a plurality of connecting holes 23, 23... with which the elastic connecting claws 22, 22... can elastically snap-engage are formed at the bottom of the fitting groove 20. Thus, the plurality of sets of elastic connecting claws 22, 22... and connecting holes 23, 23... are disposed on the left and right side walls of the first and second case halves 17A, 17B facing each other with the weight 15 in between, and are also disposed on the upper walls of the first and second case halves 17A, 17B.

[0031] A plurality of recesses 23a, 23a... for receiving the claw portions of the elastic connecting claws 22, 22... engaged with the connecting holes 23, 23... are formed on the outer surface of the case half having the connecting holes 23, 23..., by recessing the first case half 17A inward from both the left and right sides and from above. Therefore, the elastic connecting claws 22, 22... do not protrude from the outer surface of the damper case 17, making it easier to handle the dynamic damper D.

[0032] First and second elastic support parts 24A, 24B are integrally formed on both left and right side walls of the second case half 17B. These first and second elastic support parts 24A, 24B are composed of plate-shaped arms 25a, 25b protruding outward from both left and right side walls of the second case half 17B, respectively, and major arc-shaped gripping claws 26a, 26b connected to the ends of the arms 25a, 25b and capable of snap-engaging with the front vertical bone members 12c, 12c so as to grip them. In other words, the major arc-shaped gripping claws 26a, 26b can elastically grip the front vertical bone members 12c, 12c over their respective half circumferences. The major arc-shaped gripping claws 26a, 26b have their openings 27a, 27b facing rearward so as to engage with the front vertical bone members 12c, 12c from the front. Therefore, the rearward load from the head of the occupant acts in a direction that causes the gripping claws 26a, 26b of the first and second elastic support parts 24A, 24B to engage with the front vertical bone members 12c, 12c, preventing the gripping claws 26a, 26b from coming off. In addition, by selecting the length of the arms 25a, 25b, the center distance between the gripping claws 26a, 26b can be made to match the center distance between the front vertical bone members 12c, 12c, allowing the gripping claws 26a, 26b to be accurately engaged with the front vertical bone members 12c, 12c.

[0033] The major arc-shaped gripping claws 26a, 26b are formed so that their inner diameters D1, D2 are different from each other. In the illustrated example, the inner diameter D2 of the gripping claws 26b of the second elastic support portion 24B is set to be larger than the inner diameter D1 of the gripping claws 26a of the first elastic support portion 24A. The major arc-shaped gripping claws 26a, 26b are formed so that their rigidity is different from each other. In the illustrated example, a notch 28 is provided at the tip of the gripping claws 26a of the first elastic support portion 24A, or the thickness of the gripping claws 26a is set to be thinner than the gripping claws 26b so that the rigidity of the gripping claws 26a of the first elastic support portion 24A is lower than that of the gripping claws 26b of the second elastic support portion 24B. The first and second elastic support portions 24A, 24B are arranged to sandwich the center of gravity G of the weight 15.

[0034] Each of the gripping claws 26a, 26b is provided with a window hole 29, through which the engagement state between each of the gripping claws 26a, 26b and the front vertical bone members 12c, 12c can be visually confirmed.

[0035] Meanwhile, a positioning support part 30 is integrally formed on the lower wall of the first case half 17A. The positioning support part 30 is composed of a plate-shaped arm 30a protruding downward from the lower wall of the first case half 17A and a U-shaped abutment claw 30b connected to the lower end of the arm 30a and capable of abutting and engaging with the front horizontal bone member 12d. The abutment claw 30b abuts and engages with the front horizontal bone member 12d from behind, thereby determining the engagement positions of the gripping claws 26a, 26b and the left and right front vertical bone members 12c, 12c. In this way, the mounting position of the damper case 17 on the headrest frame 12 is determined.

[0036] The arms 25a, 25b of the first and second elastic support parts 24B and the positioning support part 30 are formed at their bases with thickened parts 31 for strengthening the rigidity of the bases, and further, a pair of stoppers 32, 32 are formed on the left and right side walls of the first case half 17A to abut against the arms 25a, 25b of the first and second elastic support parts 24A, 24B and restrict their forward bending, i.e., bending of the arms 25a, 25b toward the opposite side of the openings 27a, 27b of the gripping claws 26a, 26b. Each stopper 32 has a U-shaped cross section and is made up of a central wall part 32a that abuts linearly against the back surface of the corresponding gripping claws 26a, 26b, and a pair of side wall parts 32b, 32b that are connected to both ends of the central wall part 32a and abut against the curved surfaces extending from the corresponding arms 25a, 25b to the back surfaces of the gripping claws 26a, 26b. The stopper 32 configured in this way has high rigidity and can secure a wide contact area with the back surface from the corresponding arm 25a, 25b to the gripping claws 26a, 26b, so that it can effectively restrict the bending of the arms 25a, 25b while avoiding concentrated stress as much as possible. Therefore, even if a large rearward load acts on the damper case 17 from the head of the occupant, the stoppers 32, 32 come into contact with the front surface of the arms 25a, 25b, restricting the arms 25a, 25b from bending forward, and thus restricting unnecessary rearward movement of the damper case 17.

[0037] Furthermore, since the stopper 32 is integrally connected to the outer wall of the fitting groove 20, it also contributes to strengthening the rigidity of the outer wall of the fitting groove 20.

[0038] Further, the arm portion 30a of the positioning support portion 30 is formed with a plurality of reinforcing ribs 33 that connect the lower wall of the first case half 17A and the contact claw 30b.

[0039] Next, a method for embedding the dynamic damper D in the headrest 4 will be described with reference to FIG.

[0040] Forming dies 37a, 37b which can be opened and closed vertically are attached to the underside of the machine base 35 and form a cavity 36 corresponding to the external shape of the headrest 4 excluding the headrest frame 12, and the skin 14 of the headrest 4 is stretched in advance on the inner surface of the cavity 36.

[0041] The skin 14 is provided with a foamable synthetic resin pouring port 38 that opens on its upper surface, and a support plate 39 fixed to the upper surface of the forming table 35 is provided with a nozzle guide tube 40 that is inserted into the foaming material pouring port 38. A foaming material supplying device 40 that inserts a nozzle 41 into the nozzle guide tube 40 is attached to the support plate 39. Furthermore, a bracket 43 provided on the support plate 39 supports the main frame members 12a, 12a of the headrest frame 12 that are arranged inside the nozzle guide tube 40. Thus, within the skin 14, the dynamic damper D supported by the front vertical frame members 12c, 12c of the headrest frame 12 is arranged offset to one side of the foaming material pouring port 38.

[0042] Thus, foaming material 44 such as urethane is injected from a foaming material supplying device 40 through a nozzle 41 into the bag-shaped skin 14 that is in close contact with the inner surface of the cavity 36, and the foaming material is allowed to form the cushion member 13 that encases the headrest frame 12 and the dynamic damper D within the skin 14. At this time, the dynamic damper D supported by the front vertical bone members 12c, 12c is disposed offset to one side of the foaming material pouring port 38, so that the pouring pressure of the foaming material 44 into the foaming material pouring port 38 does not directly act on the dynamic damper D, and therefore there is no risk of the elastic support parts 24A, 24B of the dynamic damper D coming off from the front vertical bone members 12c, 12c due to the pouring pressure. In addition, when the first and second case halves 17A, 17B are joined, the mating grooves 20 and the mating protrusion walls 21 of their mating surfaces are fitted into each other, so that the labyrinth effect can reliably prevent the foam material 44 from penetrating through the joint surfaces of the two case halves 17A, 17B, thereby maintaining the proper vibration control function of the dynamic damper D.

[0043] The headrest 4 thus manufactured can be removed from the molds by opening the molding dies 37a, 37b vertically.

[0044] The operation of the first embodiment will now be described.

[0045] When assembling the dynamic damper D, the weight 15 wrapped in the elastic sheet 16 as described above is fitted into the first case half 17A or the second case half 17B of the damper case 17, and then the openings of the two case halves 17A, 17B are aligned and the fitting protrusion wall 21 of one opening is deeply fitted into the fitting groove 20 of the other opening.The elastic connecting claws 22, 22... engage with the locking holes 23, 23..., allowing the two case halves 17A, 17B to be easily joined together without using screws, and at the same time the weight 15 can be supported by the damper case 17 via the elastic sheet 16 in all directions.

[0046] After the first and second case halves 17A and 17B are joined together, the elastic connecting claws 22 can be elastically deformed to separate them from the connecting holes 23, so that the first and second case halves 17A and 17B can be joined together. of It is also possible to separate them and open the damper chamber 17C. Therefore, by removing the weight 15 and the elastic sheet 16 from the damper chamber 17C and replacing them with ones having different characteristics, the vibration damping characteristics of the dynamic damper D can be easily adjusted and changed.

[0047] When the dynamic damper D thus assembled is attached to the headrest frame 12, first, the gripping claws 26a, 26b of the first and second elastic support parts 24A, 24B are pressed from the front against the left and right front vertical bone members 12c, 12c of the headrest frame 12, so that the left and right gripping claws 26a, 26b snap-engage with the left and right front vertical bone members 12c, 12c to grip the front vertical bone members 12c, 12c. Therefore, the damper case 17 can be simply and easily attached to the headrest frame 12 without using any special attachment tools such as screws or bands, and further, there is no need to perform any special processing on the left and right front vertical bone members 12c, 12c for the snap engagement of the gripping claws 26a, 26b.

[0048] In this case, the inner diameter D2 of the gripping claws 26b of the second elastic support portion 24B is set larger than the inner diameter D1 of the gripping claws 26a of the first elastic support portion 24A, and since the gripping claws 26a, 26b have different rigidities, the manufacturing error between the center-to-center distance of the left and right front vertical bone members 12c, 12c and the center-to-center distance of the left and right gripping claws 26a, 26b can be absorbed by the relatively small elastic deformation of the left and right gripping claws 26a, 26b. Therefore, despite the manufacturing error, both gripping claws 26a, 26b can be easily and securely attached to both front vertical bone members 12c, 12c.

[0049] When vibrations are transmitted from the floor F of the vehicle through the seat cushion 2 and pivot 9 to the seat back 3 and headrest 4, the weight 22 in the dynamic damper D resonates in association with the elastic deformation of the elastic sheet 16, thereby absorbing the vibration energy of the seat back 3 and headrest 4, thereby damping the vibration of the seat back 3 and headrest 4.

[0050] Moreover, the dynamic damper D is constructed by accommodating the weight 15 wrapped in the elastic sheet 16 in the damper case 17 consisting of the first and second case halves 17A, 17B which are separably connected to each other, and the first and second elastic support parts 24A, 24B which engage with the front vertical bone members 12c, 12c in the opposite direction to the position of the second case half 17B, i.e., from the front, are formed in the second case half 17B, and the positioning support part 30 which abuts against the front horizontal bone member 12d in the opposite direction to the position of the first case half 17A, i.e., from the rear, is formed in the first case half 17A. Therefore, when the weight 15 vibrates violently in the front-to-rear direction and a rearward vibration impact force acts on the second case half 17B, the vibration impact force is supported by the left and right front vertical bone members 12c, 12c via the first and second elastic support parts 24A, 24B which extend from the second case half 17B. Furthermore, when a forward vibration / impact force acts on the first case half 17A, the vibration / impact force is supported by the front cross bone member 12d via the positioning support portion 30 extending from the first case half 17A. Therefore, neither the front nor rear vibration / impact force acts in a direction that would separate the first and second case halves 17A, 17B, so that disassembly of the damper case 17 due to the vibration / impact force of the weight 15 can be prevented. Furthermore, the transmission of the vibration of the weight 15 to the cushion member 13 is suppressed by the damper case 17, so that the occupant does not feel uncomfortable.

[0051] Moreover, the first and second elastic support portions 24A, 24B are disposed so as to sandwich the center of gravity G of the weight 15, so that the vibration and impact force of the weight 15 can be stably supported via the second case half 17B. Moreover, the multiple sets of elastic connecting claws 22, 22... and connecting holes 23, 23... formed in the first and second case halves 17A, 17B are disposed at positions to sandwich the weight 15, so that the vibration and impact force of the weight 15 can be effectively supported by the multiple sets of elastic connecting claws 22, 22... and connecting holes 23, 23... that are engaged with each other, so that deformation of the first and second case halves 17A, 17B can be effectively prevented.

[0052] Furthermore, since the weight 15 is formed so that its center of gravity G is located above the center C of the weight 15, the center of gravity G of the weight 22 is located as far away as possible from the support point of the vibration system consisting of the seat cushion 2 and the headrest 4, and therefore the weight 22 with a relatively small mass can provide the vibration damping function of the dynamic damper D. Moreover, since the distance A between the side of the weight 15 and the inner surface of the damper chamber 17C that faces this side with the elastic sheet 16 in between increases in the direction away from the support point 9 of the vibration system consisting of the seat back 3 and the headrest 4, the amplitude of the weight 15 increases as it moves away from the support point 9, and the vibration damping effect can be rationally improved.

[0053] The damper case 17 is a box-shaped flattened in the front-rear direction corresponding to the outer shape of the weight 15, and its front wall 17f is formed as a curved surface close to a flat surface corresponding to the front surface 15f of the weight 15, and the rear wall 17r is formed as a curved surface curved more than the front wall 17f with a convex side facing rearward corresponding to the rear surface 15r of the weight 15. Therefore, even when the head of the occupant is strongly pressed against the front wall 17f of the damper case 17 via the cushion member 13, the head of the occupant is supported by a relatively wide area of ​​the front wall 17f of the damper case 17, and the occupant does not feel uncomfortable. Moreover, the curved shape of the front wall 17f and the rear wall 17r contributes to strengthening the rigidity of the damper case 17. Furthermore, the largely curved rear surface of the weight 15 and the rear wall 17r of the damper case 17 effectively utilize the space in the headrest 4 to allow the weight 15 to be thicker, which can contribute to improving the vibration damping function of the dynamic damper D.

[0054] Next, a second embodiment of the present invention shown in FIG. 9 will be described.

[0055] In the second embodiment, three or more elastic support parts 24A-24C supported by the headrest frame 12 are formed on the damper case 17 so as to be located at the vertices of a polygon 34 surrounding the center of gravity G of the weight 15. Specifically, the first to third elastic support parts 24A-24C are formed on the damper case 17 so as to be located at the three vertices of an inverted triangle 34, and the weight 15 is formed so that the center of gravity G of the weight 15 is located in the area of ​​the inverted triangle 34. The third elastic support part 24C is basically composed of an arm 25c and a major-arc-shaped gripping claw 26c, similar to the first and second elastic support parts 24A and 24B. The headrest frame 12 is arranged to avoid the upper surface of the damper case 17.

[0056] The first and second elastic support members 24A, 24B are formed on the second case half 17B, as in the previous embodiment, and are adapted to snap-engage from the front with the left and right front vertical bone members 12c, 12c of the headrest frame 12, and the third elastic support member 24C is formed on the first case half 17A and is adapted to snap-engage from the rear with the front horizontal bone member 12d.

[0057] The other configurations are the same as those of the previous embodiment, so in FIG. 9, the parts corresponding to those of the previous embodiment are given the same reference numerals and overlapping explanations are omitted.

[0058] According to this second embodiment, three or more elastic support members 24A-24C supported by the headrest frame 12 are formed on the damper case 17 so as to be located at the vertices of a polygon 34 surrounding the center of gravity G of the weight 15. This allows the vibration and impact force of the weight 15 to be distributed approximately evenly to all of the elastic support members 24A-24C via the damper case 17, effectively reducing the vibration of the damper case 17 and contributing to improved ride comfort.

[0059] Next, the present invention shown in FIG. 1 Reference The form will be explained.

[0060] This 1 ReferenceIn this embodiment, the dynamic damper D in the first embodiment is attached to the left and right upper rib members 12b, 12b of the headrest frame 12. That is, the first and second elastic support parts 24A, 24B of the damper case 17 are snap-engaged to the left and right upper rib members 12b, 12b from above, and the positioning support part 30 is abutted and engaged from below with the cross member 46 that connects the rear ends of the left and right upper rib members 12b, 12b, so that the headrest frame 12 is not disposed on the upper surface of the damper case 17. Since the other configurations are the same as those of the first embodiment, the parts in FIG. 10 that correspond to those of the first embodiment are given the same reference numerals and redundant explanations will be omitted.

[0061] This 1 Reference According to this embodiment, by effectively utilizing the space between the left and right upper rib members 12b, 12b for installing the dynamic damper D, the cushion member 13 of the headrest 4 has a sufficient thickness at the front part where the occupant's head comes into contact, and a sufficient distance is obtained from the support point of the vibration system consisting of the seat cushion 2 and the headrest 4 to the center of gravity G of the weight 22, thereby enhancing the vibration damping function of the dynamic damper D.

[0062] Next, the present invention shown in FIG. 2 A reference embodiment will be described.

[0063] This 2 In the reference embodiment, a dynamic damper D equipped with a damper case 17 having a substantially right-angled triangular shape in front view is disposed in the inner corners of the left and right corners of the upper part of the seatback frame 10 of the seatback 3, and a pair of elastic support parts 24A, 24B formed on the upper surface and one side surface of the damper case 17 are snap-engaged with the vertical bone member 10a and the horizontal bone member 10b of the seatback frame 10, respectively. The structure of the dynamic damper D is basically the same as that of the first embodiment, except that the shapes of the damper case 17 and the weight 15 housed therein are different.

[0064] This 2According to the reference embodiment, the vibration of the seat back 3 can be effectively controlled by the action of the dynamic damper D arranged at the top of the seat back frame 10. Moreover, the dead space at the inner corner of the upper corner of the seat back frame 10 can be effectively used for installing the dynamic damper D. Note that the dynamic damper D may be arranged only at the inner corner of either the left or right corner of the upper part of the seat back frame 10.

[0065] Next, the present invention shown in FIG. 3. Implementation The form will be explained.

[0066] This 3. Implementation In this embodiment, a pair of elastic support parts 24A, 24B formed on both left and right side surfaces of the damper case 17 are snap-engaged with a pair of inclined bone parts 49a, 49a inclined in opposite directions at the center of the corrugated bone member 49 that integrally connects the upper parts of the left and right vertical bone members 10a, 10a of the seat back frame 10. At this time, the pair of elastic support parts 24A, 24B are arranged obliquely corresponding to the pair of inclined bone parts 49a, 49a, so that the pair of elastic support parts 24A, 24B are prevented from moving up and down at the pair of inclined bone parts 49a, 49a. The basic structure of the dynamic damper D is the same as that of the first embodiment. In this way, the action of one dynamic damper D attached to the upper and center part of the seat back frame 10 can effectively damp the vibration of the seat back 3.

[0067] Finally, a third embodiment of the present invention shown in FIG. 13 will be described.

[0068] In this third embodiment, in order to damp vibrations of the seat cushion 2, a damper case 17 of a dynamic damper D is attached to a front reinforcing plate 6a that is welded to the front of the seat cushion frame 6 and extends in the left-right direction. In this case, a pair of elastic support parts 50, 50 is formed on the upper surface of the damper case 17. Each elastic support part 50 is composed of a shaft part 50a that protrudes from the outer surface of the damper case 17 and an arrowhead-shaped locking protrusion 50b formed at the tip of the shaft part 50a, and a slit 50c is provided from the tip of the locking protrusion 50b to the shaft part 50a to enable elastic diameter reduction of the locking protrusion 50b. A rubber elastic collar 52 is fitted to the shaft part 50a. On the other hand, a pair of locking holes 51, 51 are drilled in the front reinforcing plate 6a corresponding to the pair of elastic support parts 50, 50. When the locking projections 50b of the elastic support parts 50, 50 are pressed into these locking holes 51, 51 from below, the locking projections 50b do not elastically shrink in diameter, but after passing through the corresponding locking holes 51, they expand in diameter to their original shape, that is, they snap into engagement and are prevented from coming off the locking holes 51. At that time, the elastic collar 52 fitted on the shaft part 50a is compressed between the front reinforcing plate 6a and the damper case 17, and the locking projections 50b are held on the front surface of the front reinforcing plate 6a without any play due to the repulsive force. Except for the elastic support parts 50, 50, the structures of the damper case 17, the weight 15 housed therein, and the elastic sheet 16 that wraps it are basically the same as those of the first embodiment. Therefore, in FIG. 12, the parts corresponding to those of the first embodiment are given the same reference numerals, and duplicated explanations will be omitted.

[0069] According to the third embodiment, vibration of the seat cushion 2 can be effectively controlled by the action of the dynamic damper D arranged at the front end of the seat cushion frame 6. Moreover, the dead space below the front reinforcing plate 6a at the front end of the seat cushion frame 6 can be effectively used for installing the dynamic damper D, and further, the elastic support parts 50, 50 can be snap-engaged with the locking holes 51, 51 of the front reinforcing plate 6a by a simple pushing operation, making it easy to attach the damper case 17.

[0070] The present invention is not limited to the above-described embodiment, and various design modifications are possible without departing from the spirit of the present invention. For example, the first to fourth embodiments are not limited to the above-described embodiment. 2 In the embodiment, 2 The third and fourth reference embodiments may be used in combination. One of the first and second halves 17A, 17B constituting the damper case 17 may be formed in a box shape having an opening, and the other in a lid shape that closes the opening. The seat device of the present invention is not limited to automobiles, but may also be applied to railroad cars, airplanes, and the like. The seat S may also be installed so as to protrude from the wall of the vehicle. [Explanation of symbols]

[0071] C: Center of weight D... Dynamic Damper G: Center of gravity of weight P·····Pad S... Sheet 2. Seat cushion 3. Seat back 4. Headrest 6······Seat cushion frame 9. Axis 10 Seat back frame 12 Headrest frame M 12a... Main frame member 13 Cushioning member 14 Headrest covering 15... Weight 15f...Front of weight 15r...Rear surface of weight 16... Bullets Sex Scene to 16a: Center of elastic sheet 16b to 16e: Elastic sheet piece 17 Damper case

Claims

[Claim 1] A vehicle seat device comprising a dynamic damper attached to a frame of a seat having a cushion member and to be installed in a vehicle, the dynamic damper is comprised of a damper case consisting of first and second case halves separably joined to each other, a weight housed in the damper case, and an elastic member formed of a separate member from the cushion member and interposed between the weight and the damper case to allow vibration of the weight, a plurality of mounting portions that are attached to the frame are formed on the damper case; A vehicle seat device characterized in that, in a front view of the seat, a portion of the mounting portion engages with the frame at two locations on the left and right of the damper case, and a mounting portion separate from the two left and right mounting portions is provided between the two left and right mounting portions.

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