JP2020179847A5 - - Google Patents

Description

Vehicle seat device

The present invention relates to an improvement of a vehicle seat device in which a dynamic damper is attached to a seat frame installed on the vehicle.

In such a vehicle seat device, a dynamic damper is composed of a housing, a weight oscillatingly housed in the housing, and an elastic member interposed between the weight and the housing. It is known to be disclosed in Patent Document 1 below.

Japanese Unexamined Patent Publication No. 2002-242986

In the dynamic damper in the vehicle seat device disclosed in Patent Document 1, the housing is integrated so as not to be disassembled after the weight and the elastic member are accommodated. Therefore, once the dynamic damper is assembled, vibration damping is performed. Even if it is necessary to adjust or change the 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 mounting portion for the seat, a special mounting device such as a band must be used for mounting on the seat, and the mounting work is also troublesome.

The present invention has been made in view of such circumstances, and it is possible to replace the weight and the elastic member for adjusting or changing the vibration damping characteristics, and the damper case (housing) can be attached to the seat. It is an object of the present invention to provide a good vehicle seat device.

To achieve the above object, the present invention is the seat of the frame to be installed in a vehicle having a cushion member, formed by attaching a dynamic damper, in a vehicle seat apparatus, the dynamic damper can be separated from each other The damper case composed of the first and second case halves coupled to the damper case, the weight housed in the damper case, and the cushion member are formed of separate members to allow vibration of the weight. It is constituted by an elastic member interposed between the heavy mass and the damper case so as, in the said damper case, a main body for accommodating the weight and the elastic member, the right and left in the frame 2 It is formed and a mounting portion mounted in place is, the left-right direction of the outer end of said body portion, a first feature that you located between the frame.

The present invention, in addition to the first feature, the mounting portion of the damper case, the second feature that you have attached to the front portion of the frame.

Further, in the present invention, in addition to the first or second feature, the damper case has a third attachment portion to be attached to the frame in addition to the two attachment portions, and the third attachment portion. mounting portion of the the Rukoto attached to the frame at a position overlapping with the weight in the vertical direction and the third feature.

Incidentally, the sheet in the vehicle seat S in the embodiment of the present invention to be described later, the frame to the headrest frame 12, the elastic member in elastic sheet 16, the mounting portion of the front Symbol two places first, 2 The elastic support portions 24A and 24B, the third attachment portion is the elastic support portion 24C or the positioning support portion 30, and the outer ends of the main body portion in the left-right direction are the left and right of the first and second case halves 17A and 17B. Corresponds to the outer edges of both side walls.

According to the first to third features of the present invention, for the vehicle, the weight and the elastic member can be replaced for adjusting or changing the vibration damping characteristics, and the damper case can be easily attached to the seat. A seat device can be configured.

The side view of the seat device for automobiles which concerns on 1st Embodiment of this invention. Enlarged view of the second part (peripheral part of the headrest) of FIG. 3 arrow view of FIG. 4 arrow view of FIG. FIG. 5-5 is a sectional view taken along line 5-5 of FIG. The perspective view corresponding to FIG. An exploded perspective view of the dynamic damper in FIG. Explanatory drawing of molding method using foam material of cushion member of headrest. The front view corresponding to FIG. 3 which shows the 2nd Embodiment of this invention. The perspective view of the headrest which shows the 3rd Embodiment of this invention. FIG. 3 is a perspective view of an automobile seat device showing a first reference embodiment of the present invention. FIG. 3 is a perspective view of an automobile seat device showing a second reference embodiment of the present invention. FIG. 3 is a perspective view of an automobile seat device showing a third reference embodiment of the present invention.

First, the first embodiment of the present invention shown in FIGS. 1 to 8 will be described. In the following description, front and rear, left and right are referred to with reference to the automobile to which the present invention is applied.

In FIG. 1, the automobile seat S includes 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 and 7 formed at the lower portion, and the support legs 7 and 7 are fixed to the floor F of the automobile.

A pair of left and right brackets 8 projecting upward are continuously provided at the rear end of the seat cushion frame 6, and the seat back frame 10 of the seat back 3 is reclinably connected to these brackets 8 via a pivot 9. ..

A pair of left and right support cylinders 11 and 11 are fixedly provided at the upper end of the seat back frame 10, and the headrest 4 is supported by these support cylinders 11 and 11 so as to be able to move up and down and be fixed.

As shown in FIGS. 2 to 6, the headrest 4 is formed in a teardrop shape with a headrest frame 12, a cushion member 13 made of urethane foam supported by the headrest frame 12, and a skin 14 covering the surface thereof. The dynamic damper D is attached to the frame 12.

The headrest frame 12 is formed by bending a pipe material, and is formed by bending a pair of left and right main bone members 12a and 12a supported by the pair of support cylinders 11 and 11 and from the upper ends of the main bone members 12a and 12a to the front. The bent upper bone members 12b, 12b, the pair of left and right anterior longitudinal bone members 12c, 12c extending downward from the front ends of the upper bone members 12b, 12b, and the lower ends of the anterior longitudinal bone members 12c, 12c. It is composed of anterior transverse bone members 12d that are integrally connected to each other, and the left and right anterior longitudinal bone members 12c and 12c are welded so that a reinforcing crossbar 19 having a diameter smaller than that of the pipe material is bridged. Thus, a cushion member 13 is formed so as to wrap the headrest frame 12 from the upper part of the main bone members 12a and 12a to the anterior lateral bone member 12d, and the cushion member 13 is covered with the skin 14.

Prior to the formation of the cushion member 13, the dynamic damper D is attached using the anterior longitudinal bone members 12c and 12c and the anterior transverse bone member 12d. The dynamic damper D includes a weight 15, an elastic sheet 16 that wraps the weight 15 so as to overlap the entire surface thereof, and a damper case 17 having a damper chamber 17C that accommodates the weight 15 and the elastic sheet 16. The headrest frame 12 is arranged so as to avoid a portion between the upper surface of the damper case 17 and the inner surface of the skin 14 facing the upper surface. Further, the weight 15 is supported by the damper case 17 via the elastic sheet 16 in all directions thereof.

As shown in FIGS. 2, 5 and 7, the weight 15 is made of cast iron and has a hexahedron flat in the front-rear direction, and its front surface 15f is formed on a convex curved surface close to a plane. The rear surface 15r is formed on a curved surface that projects rearwardly more than the front surface 15f. Further, the weight 15 is formed so that the wall thickness in the front-rear direction and / or the width in the left-right direction gradually increases upward, whereby the center of gravity G of the weight 15 is above the center C of the weight 15. It will occupy a position.

The elastic sheet 16 is made of urethane foam, and is formed by projecting four sheet pieces 16b to 16e from a square central portion 16a corresponding to the rear surface 15r of the weight, and the weight 15 is wrapped by the elastic sheet 16. After placing the front surface 15f of the weight 15 on the central portion 16a of the elastic sheet 16, the four sheet pieces 16b to 16e are erected respectively, then folded toward the rear surface 15r side of the weight 15 and the front surface 15f thereof. Is adhered to the surface via the double-sided adhesive tape 18. The weight 15 wrapped in the elastic sheet 16 in this way is housed in the damper case 17 divided into two front and rear parts. At that time, the elastic sheet 16 is interposed between the outer surface of the weight 15 and the inner surface of the damper chamber 17C facing the outer surface in a compressed state. As a result, it is possible to prevent the elastic sheet 16 from shifting in the damper chamber 17C, keep the weight 15 at a predetermined position at all times, suppress unnecessary movement of the weight 15, and secure a predetermined vibration damping function. ..

The damper case 17 has a main body portion for accommodating the weight 15 and the elastic sheet 16 and a mounting portion for attaching the main body portion to the headrest frame 12. As shown in FIGS. 2 to 7, the main body of the damper case 17 has a shape similar to the outer shape of the weight 15, and therefore has a flat box shape in the front-rear direction, and the front wall 17f thereof. Is formed on 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 on a curved surface corresponding to the rear surface 15r of the weight 15 so as to project significantly rearward. NS.

The main body of the damper case 17 is divided into two parts, a first case half body 17A on the front side and a second case half body 17B on the rear side, and elasticity is provided between the first and second case half bodies 17A and 17B. A damper chamber 17C capable of accommodating the weight 15 wrapped in the sheet 16 is defined. The case halves 17A and 17B are each molded of synthetic resin.

In the first and second case halves 17A and 17B, the distance A between the side surface of the weight 15 along the vertical direction and the inner surface surface of the damper chamber 17C facing the side surface with the elastic sheet 16 sandwiched between them (see FIG. 2). Is formed so as to increase upward. That is, the interval A increases as the distance from the support point 9 of the vibration system including the seat back 3 and the headrest 4 increases. In the case of the illustrated example, in order to emphasize the damping of the front-rear vibration of the vibration system, the first and second case halves 17A and 17B have a distance A in the front-rear direction between the weight 15 and the inner surface of the damper chamber 17C. It is formed so as to increase away from the support point 9, that is, upward.

Further, on one and the other of the mating surfaces of the two case halves 17A and 17B, a fitting groove 20 and a fitting protrusion 21 which surround the damper chamber 17C and can be fitted to each other are formed, and the fitting protrusion 21 is formed. A plurality of elastic connecting claws 22, 22 ... Protruding outward are formed at the tip end portion of 21, and a plurality of connecting holes 23, 23 ... In which these elastic connecting claws 22, 22 ... Can be elastically snap-engaged. Is formed at the bottom of the fitting groove 20. Thus, a plurality of sets of elastic connecting claws 22, 22 ... And connecting holes 23, 23 ... Are arranged on the left and right side walls of the first and second case halves 17A and 17B facing each other with the weight 15 interposed therebetween. It is also arranged on the upper side walls of the first and second case halves 17A and 17B.

On the outer surface of the case half body having the connecting holes 23, 23 ..., the first case half body 17A in the illustrated example, the claw portions of the elastic connecting claws 22, 22 ... Engage with the connecting holes 23, 23 ... A plurality of receiving recesses 23a, 23a ... Are formed by recessing the first case half body 17A inward from both the left and right sides and from above, respectively. Therefore, the elastic connecting claws 22, 22 ... Do not become protrusions from the outer surface of the main body of the damper case 17, and the dynamic damper D can be easily handled.

The first and second elastic support portions 24A and 24B are integrally formed on the left and right side walls of the second case half body 17B as attachment portions to the left and right two positions of the headrest frame 12, and these first and second elastic support portions are integrally formed. The left and right side walls of the first and second case halves 17A and 17B, which are the outer ends of the main body of the damper case 17 in the left-right direction, are formed between the front vertical bone members 12c and 12c of the headrest frame 12 by the portions 24A and 24B. Ru is allowed to position to. The first and second elastic support portions 24A and 24B are connected to the plate-shaped arms 25a and 25b protruding outward from the left and right side walls of the second case semifield 17B, respectively, and to the tips of the arms 25a and 25b. It is composed of superior arc-shaped gripping claws 26a and 26b that can be snap-engaged with the anterior longitudinal bone members 12c and 12c so as to grip the anterior longitudinal bone members 12c and 12c. That is, the superior arc-shaped gripping claws 26a and 26b can elastically grip the anterior longitudinal bone members 12c and 12c beyond their respective half circumferences. The superior arc-shaped gripping claws 26a and 26b have their openings 27a and 27b directed rearward so as to engage the anterior longitudinal bone members 12c and 12c from the front. Therefore, the backward load from the occupant's head acts in the direction of engaging the gripping claws 26a, 26b of the first and second elastic support portions 24A, 24B with the anterior longitudinal bone members 12c, 12c, and grips It is possible to prevent the claws 26a and 26b from coming off. Further, by selecting the lengths of the arms 25a and 25b, the distance between the centers of both gripping claws 26a and 26b is made to match the distance between the centers of both anterior longitudinal bone members 12c and 12c, and the anterior longitudinal bone members of the gripping claws 26a and 26b are matched. Engagement with 12c and 12c can be performed accurately.

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

Further, window holes 29 are provided in the gripping claws 26a and 26b, and the engagement state between the gripping claws 26a and 26b and the anterior longitudinal bone members 12c and 12c can be visually confirmed from the window holes 29. ing.

On the other hand, a positioning support portion 30 as a third attachment portion to the headrest frame 12 is integrally formed on the lower side wall of the first case semifield 17A. The positioning support portion 30 is connected to the plate-shaped arm 30a protruding downward from the lower side wall of the first case semifield 17A and the lower end of the arm 30a, and abuts and engages with the anterior lateral bone member 12d. It is composed of a U-shaped abutting claw 30b to be obtained, and the abutting claw 30b abuts and engages with the anterior lateral bone member 12d from the rear, whereby the gripping claws 26a and 26b and the left and right anterior longitudinal bone members The engagement positions with 12c and 12c are defined. The positioning support portion 30 is attached to the anterior transverse bone member 12d at a position overlapping the weight 15 in the vertical direction, and thus the attachment position of the damper case 17 on the headrest frame 12 is determined.

At the roots of the arms 25a and 25b of the first and second elastic support portions 24B and the positioning support portion 30, a thickening portion 31 for strengthening the rigidity of the roots is formed, and further, the first and second elastic support portions 24A. , A pair of stoppers 32, 32 that abut on the arms 25a, 25b of the 24B and restrict the bending of the arms 25a, 25b forward, that is, to the side opposite to the openings 27a, 27b of the gripping claws 26a, 26b. It is formed on the left and right side walls of the first case half body 17A. Each stopper 32 has a central wall portion 32a that linearly contacts the back surface of the corresponding gripping claws 26a and 26b, and gripping claws 26a and 26b from the corresponding arms 25a and 25b that are connected to both side ends of the central wall portion 32a. A pair of side wall portions 32b and 32b that abut on the curved surface extending over the back surface of the wall are formed in a U-shaped cross section. The stopper 32 having such a configuration has high rigidity and can secure a wide contact area with the back surface from the corresponding arms 25a and 25b to the gripping claws 26a and 26b, so that concentrated stress can be avoided as much as possible and the arm. The deflection of 25a and 25b can be effectively regulated. Therefore, even if a large backward load is applied to the damper case 17 from the occupant's head, the stoppers 32 and 32 abut on the front surfaces of the arms 25a and 25b to regulate the forward bending of the arms 25a and 25b. Therefore, unnecessary backward movement of the damper case 17 can be restricted.

Further, 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.

Further, the arm portion 30a of the positioning support portion 30 is formed with a plurality of reinforcing ribs 33 for connecting the lower side wall of the first case half body 17A and the contact claw 30b.

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

Molds 37a and 37b that can be opened and closed vertically are attached to the lower surface of the machine base 35 to form a cavity 36 corresponding to the outer shape of the headrest 4 excluding the headrest frame 12, and the inner surface of the cavity 36 is previously attached. The skin 14 of the headrest 4 is stretched.

The skin 14 is provided with a foamable synthetic resin pouring port 38 that opens on the upper surface thereof, and the support plate 39 fixed to the upper surface of the molding table 35 has a nozzle guide cylinder that is inserted into the foam material pouring port 38. 40 is provided. Further, a foam material supply device 40 for inserting the nozzle 41 into the nozzle guide cylinder 40 is attached to the support plate 39. Further, the bracket 43 provided on the support plate 39 supports the main bone members 12a and 12a of the headrest frame 12 arranged in the nozzle guide cylinder 40. Thus, in the epidermis 14, the dynamic damper D supported by the anterior longitudinal bone members 12c and 12c of the headrest frame 12 is arranged so as to be offset to one side of the foam material pouring port 38.

Thus, the foam material 44 such as urethane is injected from the foam material supply device 40 through the nozzle 41 into the bag-shaped skin 14 in close contact with the inner surface of the cavity 36, and by foaming the foam material 44, the headrest frame is introduced into the skin 14. A cushion member 13 that encloses the 12 and the dynamic damper D can be formed. At that time, the dynamic damper D supported by the anterior longitudinal bone members 12c and 12c is arranged so as to be offset to one side of the foam material pouring port 38, so that the foam material 44 is poured into the foam material pouring port 38. Since the pressure does not act directly on the dynamic damper D, there is no concern that the elastic support portions 24A and 24B of the dynamic damper D will be separated from the anterior longitudinal bone members 12c and 12c due to the inflow pressure. Further, in the first and second case halves 17A and 17B, when the fitting grooves 20 and the fitting protrusions 21 of their mating surfaces are fitted to each other at the time of joining, the foam material 44 is the both case halves. Intrusion from the joint surfaces of 17A and 17B can be reliably prevented by the labyrinth effect, and the proper vibration damping function of the dynamic damper D can be maintained.

The headrest 4 manufactured in this way can be taken out of the mold by opening the molding molds 37a and 37b up and down.

The operation of this first embodiment will be described.

In assembling the dynamic damper D, the weight 15 wrapped in the elastic sheet 16 is fitted into the first case half body 17A or the second case half body 17B of the damper case 17 as described above, and then both case half bodies 17A. When the openings of 17B are aligned and the fitting protrusion 21 of the other opening is deeply fitted into the fitting groove 20 of one opening, the elastic connecting claws 22, 22 ... And the locking holes 23, 23 ... By engaging the two cases, the semifields 17A and 17B can be easily connected without using screws, and at the same time, the weight 15 is supported by the damper case 17 via the elastic sheet 16 in all directions thereof. be able to.

Further, even after the first and second case halves 17A and 17B are connected, the elastic connecting claws 22, 22 ... Are elastically deformed to be separated from the connecting holes 23, 23 ..., And both case halves 17A, It is also possible to separate the 17B and open the damper chamber 17C. Therefore, by taking out the weight 15 and the elastic sheet 16 from the damper chamber 17C and replacing them with those having different characteristics, the vibration damping characteristics of the dynamic damper D can be easily adjusted and changed.

In attaching the dynamic damper D assembled in this way to the headrest frame 12, first, the gripping claws 26a and 26b of the first and second elastic support portions 24A and 24B are attached to the left and right anterior longitudinal bone members 12c and 12c of the headrest frame 12. When pressed from the front, the left and right gripping claws 26a and 26b can snap-engage the left and right anterior longitudinal bone members 12c and 12c to grip the anterior longitudinal bone members 12c and 12c. Therefore, the damper case 17 can be easily and easily attached to the headrest frame 12 without using special attachments such as screws and bands, and for snap engagement of the gripping claws 26a and 26b. In addition, it is not necessary to perform special processing on the left and right anterior longitudinal bone members 12c and 12c.

At that time, the inner diameter D2 of the gripping claw 26b of the second elastic support portion 24B is set larger than the inner diameter D1 of the gripping claw 26a of the first elastic support portion 24A, and the rigidity of the gripping claws 26a and 26b is different from each other. Therefore, the manufacturing error between the center-to-center distances of the left and right anterior longitudinal bone members 12c and 12c and the center-to-center distances of the left and right gripping claws 26a and 26b is absorbed by the relatively small elastic deformation of the left and right gripping claws 26a and 26b. Therefore, despite the manufacturing error, both gripping claws 26a and 26b can be easily and securely attached to both anterior longitudinal bone members 12c and 12c.

When vibration is transmitted from the floor F of the vehicle to the seat back 3 and the headrest 4 via the seat cushion 2 and the pivot 9 while the vehicle is running, the weight 22 resonates with the elastic deformation of the elastic seat 16 in the dynamic damper D. Therefore, the vibration energy of the seat back 3 and the headrest 4 is absorbed instead, and the seat back 3 and the headrest 4 can be suppressed.

Moreover, the dynamic damper D is configured by accommodating the weight 15 wrapped in the elastic sheet 16 in the main body of the damper case 17 composed of the first and second case semifields 17A and 17B which are separably coupled to each other. The first and second elastic support portions 24A and 24B that engage with the anterior longitudinal bone members 12c and 12c from the front in the direction opposite to the position of the second case half body 17B are formed on the second case half body 17B. Since the positioning support portion 30 is formed on the first case semifield 17A in the direction opposite to the position of the first case semifield 17A, that is, in contact with the anterior transverse bone member 12d from the rear, the weight 15 is moved in the front-rear direction. When it violently vibrates and a backward vibration impact force acts on the second case half body 17B, the vibration impact force is applied to the left and right via the first and second elastic support portions 24A and 24B extending from the second case half body 17B. It is supported by the anterior longitudinal bone members 12c and 12c. Further, when a forward vibration impact force acts on the first case half body 17A, the vibration impact force is supported by the anterior transverse bone member 12d via the positioning support portion 30 extending from the first case half body 17A. Therefore, since the vibration impact force in either the front-rear direction does not act in the direction of separating the first and second case halves 17A and 17B, it is possible to prevent the damper case 17 from being disassembled by the vibration impact force of the weight 15. can. Further, since the vibration of the weight 15 is suppressed from being transmitted to the cushion member 13 by the damper case 17, the occupant does not feel uncomfortable.

Further, since the first and second elastic support portions 24A and 24B are arranged so as to sandwich the center of gravity G of the weight 15, the vibration impact force of the weight 15 is stably supported via the second case half body 17B. can do. Further, since the plurality of sets of elastic connecting claws 22, 22 ... And the connecting holes 23, 23 ... Formed on the first and second case halves 17A and 17B are arranged at positions sandwiching the weight 15, the weight 15 The vibration impact force of the above is effectively supported by a plurality of sets of elastic connecting claws 22, 22 ... And connecting holes 23, 23 ... In an engaged state with each other, and the deformation of the first and second case halves 17A and 17B is effective. Can be prevented.

Further, since the center of gravity G of the weight 15 is formed so as to be above the center C of the weight 15, the center of gravity G of the weight 22 is from the support point of the vibration system including the seat cushion 2 and the headrest 4. Since it occupies a position as far away as possible, the vibration damping function of the dynamic damper D can be imparted with the weight 22 having a relatively small mass. Moreover, the distance A between the side surface of the weight 15 and the inner surface surface of the damper chamber 17C facing the side surface with the elastic sheet 16 sandwiched thereof is in a direction away from the support point 9 of one vibration system including the seat back 3 and the headrest 4. Since the weight is increased toward, the amplitude of the weight 15 increases as the distance from the support point 9 increases, so that the vibration damping effect can be reasonably enhanced.

Further, the main body of the damper case 17 has a box shape flattened in the front-rear direction corresponding to the outer shape of the weight 15, and the front wall 17f thereof has a curved surface close to a flat surface corresponding to the front surface 15f of the weight 15. Since the rear wall 17r is formed on a curved surface that is curved more than the front wall 17f with the convex side facing rearward corresponding to the rear surface 15r of the weight 15, the head of the occupant is formed via the cushion member 13. Even when the vehicle is strongly pressed against the front wall 17f of the damper case 17, the occupant's head is supported by a relatively large area of the front wall 17f of the damper case 17, which does not give the occupant a sense of discomfort. Moreover, the curved shapes of the front wall 17f and the rear wall 17r contribute to strengthening the rigidity of the damper case 17. The rear surface of the weight 15 and the rear wall 17r of the damper case 17 that are further curved allow the weight 15 to be thickened by effectively utilizing the space in the headrest 4, and improve the vibration damping function of the dynamic damper D. Can contribute to.

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

In this second embodiment, the damper case 17 is formed so that three or more elastic support portions 24A to 24C supported by the headrest frame 12 are located at the vertices of the polygon 34 surrounding the center of gravity G of the weight 15. Specifically, the damper case 17 is formed so that the three first to third elastic support portions 24A to 24C are arranged at the three vertices of the inverted triangle 34, and in the region of the inverted triangle 34. The weight 15 is formed so that the center of gravity G of the weight 15 is located. The third elastic support portion 24C is basically composed of an arm 25c and a superior arc-shaped gripping claw 26c, similarly to the first and second elastic support portions 24A and 24B. The headrest frame 12 is arranged so as to avoid the upper surface of the damper case 17.

The first and second elastic support portions 24A and 24B are formed on the second case semifield 17B as in the previous embodiment, and are snapped to the left and right anterior longitudinal bone members 12c and 12c of the headrest frame 12 from the front. The third elastic support portion 24C is formed on the first case semifield 17A so as to be snap-engaged with the anterior transverse bone member 12d from the rear.

Since other configurations are the same as those of the previous embodiment, the same reference numerals are given to the parts corresponding to the previous embodiments in FIG. 9, and duplicate description will be omitted. The third elastic support portion 24C is attached to the anterior transverse bone member 12d at a position overlapping the weight 15 in the vertical direction to form a third attachment portion of the damper case.

According to this second embodiment, the damper case 17 is formed so that three or more elastic support portions 24A to 24C supported by the headrest frame 12 are located at the apex of the polygon 34 surrounding the center of gravity G of the weight 15. By doing so, the vibration impact force of the weight 15 is distributed substantially evenly to all the elastic support portions 24A to 24C via the damper case 17, and the vibration of the damper case 17 is effectively suppressed to be small, and the riding comfort is improved. Can contribute to improvement.

Next, a third embodiment of the present invention shown in FIG. 10 will be described.

In this third embodiment, the dynamic damper D in the first embodiment is attached to the left and right upper bone members 12b, 12b of the headrest frame 12. That is, the first and second elastic support portions 24A and 24B of the damper case 17 are snap-engaged to the left and right upper bone members 12b and 12b from above, and the positioning support portion 30 is the left and right upper bone members 12b and 12b. The headrest frame 12 is not arranged on the upper surface of the damper case 17 because it is abutted and engaged with the cross member 46 connecting the rear ends from below. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the parts corresponding to the first embodiment in FIG. 10, and duplicate description will be omitted.

According to the third embodiment, by effectively utilizing the space between the left and right upper bone members 12b and 12b for the installation of the dynamic damper D, the front portion of the cushion member 13 of the headrest 4 with which the head of the occupant comes into contact. The vibration damping function of the dynamic damper D can be enhanced by ensuring a sufficient wall thickness and obtaining a sufficient distance from the support point of the vibration system including the seat cushion 2 and the headrest 4 to the center of gravity G of the weight 22. can.

Next, the first reference embodiment of the present invention shown in FIG. 11 will be described.

In this first reference embodiment, in the seat back 3, a dynamic damper D provided with a damper case 17 having a substantially right-angled triangular shape when viewed from the front is arranged in the inner corners of the upper left and right corners of the seat back frame 10. A pair of elastic support portions 24A and 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 seat back frame 10, respectively. The structure of the dynamic damper D is basically the same except that the shapes of the damper case 17 and the weight 15 housed therein are different from those of the first embodiment.

According to this first reference embodiment, the vibration damping of the seat back 3 can be effectively performed by the action of the dynamic damper D arranged at the uppermost portion of the seat back frame 10. Moreover, the dead space in the inner corner of the upper corner of the seat back frame 10 can be effectively used for installing the dynamic damper D. The dynamic damper D may be arranged only in the inner corner of either the left or right corner of the upper part of the seat back frame 10.

Next, the second reference embodiment of the present invention shown in FIG. 12 will be described.

In this second reference embodiment, a pair of inclined bone portions 49a, 49a inclined in opposite directions at the central portion of the wavy bone member 49 that integrally connects the upper portions of the left and right vertical bone members 10a and 10a of the seat back frame 10. The pair of elastic support portions 24A and 24B formed on the left and right side surfaces of the damper case 17 are snap-engaged, respectively. At that time, the pair of elastic support portions 24A and 24B are obliquely arranged corresponding to the pair of inclined bone portions 49a and 49a, whereby the pair of elastic support portions 24A and 24B are arranged with the pair of inclined bone portions 49a and 49a. The vertical movement is blocked. The basic structure of the dynamic damper D is the same as that of the first embodiment. In this way, the vibration damping of the seat back 3 can be effectively performed by the action of one dynamic damper D attached to the upper portion and the central portion of the seat back frame 10.

Finally, the third reference embodiment of the present invention shown in FIG. 13 will be described.

In this third reference embodiment, the damper case 17 of the dynamic damper D is attached to the front reinforcing plate 6a which is welded to the front portion of the seat cushion frame 6 and extends in the left-right direction in order to suppress the vibration of the seat cushion 2. In this case, the damper case 17 is formed with a pair of elastic support portions 50, 50 on the upper surface thereof. Each elastic support portion 50 is composed of a shaft portion 50a protruding from the outer surface of the damper case 17 and an arrowhead-shaped locking projection 50b formed at the tip of the shaft portion 50a, and the elastic support portion 50b is elastic. A slit 50c is provided from the tip of the locking projection 50b to the shaft portion 50a in order to enable a smooth diameter reduction. A rubber elastic collar 52 is fitted on the shaft portion 50a. On the other hand, a pair of locking holes 51, 51 are bored in the front reinforcing plate 6a corresponding to the pair of elastic support portions 50, 50, and the elastic support portions 50, 50 are formed in these locking holes 51, 51. By pushing the locking projection 50b from below, each locking projection 50b does not elastically shrink in diameter, but after passing through the corresponding locking hole 51, the diameter is expanded to the original shape, that is, snap-engaged and locked. The detachment from the hole 51 is prevented. At that time, the elastic collar 52 fitted to the shaft portion 50a is compressed between the front reinforcing plate 6a and the damper case 17, and the repulsive force causes the locking projection 50b to play back on the front surface of the front reinforcing plate 6a. It is held without. Other than the elastic support portions 50 and 50, the structure of the damper case 17, the weight 15 housed therein, and the elastic sheet 16 surrounding the damper case 17 is basically the same as that of the first embodiment. Therefore, in FIG. 12, the parts corresponding to the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

According to this third reference embodiment, the vibration damping of the seat cushion 2 can be effectively performed by the action of the dynamic damper D arranged at the front end portion 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 the installation of the dynamic damper D, and the elastic support portions 50, 50 can be moved to the front reinforcing plate 6a by a simple pushing operation. It can be snap-engaged with the locking holes 51, 51, and the damper case 17 can be easily attached.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof. For example, the first and third reference embodiments can be used in combination with the first to third embodiments. Further, one of the first and second halves 17A and 17B constituting the damper case 17 can be formed in a box shape having an opening, and the other can be formed in a lid shape for closing the opening. Further, the seat device of the present invention can be applied not only to automobiles but also to railway vehicles, aircraft and the like. The seat S can also be installed so as to project from the wall surface of the vehicle.

D ・ ・ ・ ・ ・ ・ Dynamic damper S ・ ・ ・ ・ ・ ・ Seat 12 ・ ・ ・ ・ ・ Headrest frame (frame)
15 ・ ・ ・ ・ ・ Weight 16 ・ ・ ・ ・ ・ Elastic member (elastic sheet)
17 ... Damper case 17A ... First case half body 17B ... Second case half body
2 4A, 24B, 24C ··· mounting portion (elastic support portion)
30 ... Mounting part (positioning support part)

Claims (3)

In a vehicle seat device in which a dynamic damper is attached to the frame of a seat having a cushion member and installed on the vehicle.
The dynamic damper is formed of a damper case composed of first and second case halves that are separably coupled to each other, a weight housed in the damper case, and a member different from the cushion member. wherein it is composed of a heavy weight to allow vibration of the weight and the elastic member is interposed between the damper case,
The damper case is formed with a main body portion that accommodates the weight and the elastic member, and attachment portions that are attached to the frame at two locations on the left and right, and the outer end of the main body portion in the left-right direction is the frame. characterized that you positioned between a vehicle seat apparatus. The vehicle seat device according to claim 1, wherein the mounting portion of the damper case is mounted on a front portion of the frame. The damper case has a third mounting portion to be mounted on the frame in addition to the two mounting portions, and the third mounting portion is positioned so as to overlap the weight in the vertical direction. The vehicle seat device according to claim 1 or 2, wherein the vehicle seat device is attached to a frame.