JP2019142493A - Dynamic damper device, head rest device comprising dynamic damper device, and vehicular seat device comprising dynamic damper device - Google Patents

Abstract

To provide a vehicular seat device which allows an exchange of a weight or an elastic member for adjusting and changing vibration control characteristics, and which achieves preferable attachment properties of a damper case to a seat.SOLUTION: A dynamic damper D comprises: a damper case 17 formed of first and second case half bodies 17A, 17B which are coupled so as to separate each other and define a damper chamber mutually; a weight 15 accommodated in the damper chamber; and an elastic member interposed between the weight 15 and an inner surface of the damper chamber for allowing vibration of the weight 15. The damper case 17 comprises attachment parts 24A, 24B each of which is attached to a frame 12 of the seat at one of left and right two positions, the frame 12 is arranged while avoiding a part between a top surface of the damper case 17 and an inner surface of the seat facing the top surface.SELECTED DRAWING: Figure 6

Description

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

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

JP 2002-242986 A

  In the dynamic damper in the vehicle seat device disclosed in Patent Document 1, the housing is integrated so that it cannot be disassembled after the weight and the elastic member are accommodated. Therefore, once the dynamic damper is assembled, the vibration damper is assembled. Even if it is necessary to adjust or change the characteristics, the weight and the elastic member cannot be replaced with ones having different characteristics, and a new dynamic damper must be manufactured, which is uneconomical. In addition, since the housing is not provided with an attachment portion to the seat, a special attachment device such as a band has to be used for attachment to the seat, and the attachment work is troublesome.

  The present invention has been made in view of such circumstances, and makes it possible to replace a weight and an elastic member for adjusting or changing a damping characteristic, and also to attach a damper case (housing) to a seat. An object of the present invention is to provide an excellent vehicle seat apparatus.

  In order to achieve the above object, the present invention provides a vehicle seat device in which a dynamic damper is attached to a seat frame installed on a vehicle having a cushion member, and the dynamic dampers can be separated from each other. A damper case composed of first and second case halves coupled to the body, a weight housed in the damper case, and the cushion member are formed as separate members to allow vibration of the weight. The elastic member interposed between the weight and the damper case as described above, forming a plurality of attachment portions attached to the frame on the damper case, and in front view of the seat, A part of the attachment part engages with the frame at two places on the left and right of the damper case, and a separate attachment is provided between the two attachment parts on the left and right sides. That part is provided to the first feature.

  Further, according to the present invention, in addition to the first feature, a portion of the frame where the left and right mounting portions are engaged is a portion extending in a vertical direction of the seat, and the left and right two portions are engaged. A second feature is that a portion that engages with the attachment portions provided between the attachment portions is a portion that extends in the left-right direction of the seat.

  Furthermore, in addition to the first or second feature, the present invention provides the headrest frame, which has a pair of left and right main bone members extending in the vertical direction of the seat. A third feature is that the attachment portion is engaged with the main bone member, and the weight and the main bone member overlap each other in the vertical direction of the seat.

  Furthermore, in addition to the third feature, the present invention is characterized in that the attachment portions at the two left and right positions are in a position overlapping the weight and the main bone member in the vertical direction of the seat. To do.

  Furthermore, in addition to any one of the first to fourth characteristics, the present invention provides a headrest frame, which has a bone member extending in the left-right direction of the seat, The attachment portion provided between the attachment portions is engaged with the bone member, and is characterized in that the weight and the bone member overlap each other in the left-right direction of the seat.

  Furthermore, in the present invention, in addition to the fifth feature, the mounting portion provided between the two mounting portions on the left and right sides is positioned so as to overlap the weight and the bone member in the left-right direction of the seat. This is the sixth feature.

  Furthermore, in addition to any of the first to sixth features, the present invention relates to the frame so that the attachment portions at the two left and right sides cover the front surface of the frame in a front view of the seat. It is the seventh feature that they match.

  Furthermore, in addition to any of the first to seventh features, the present invention provides the damper case with a concave portion in which the damper case is recessed inward from the left and right sides in front view of the seat. The eighth feature is that the recesses are located in a position overlapping the weight in the vertical direction.

  The elastic member is the elastic sheet 16 in the embodiment of the present invention, which will be described later, the cushion member is the cushion member 13, the left and right two attachment portions are the elastic support portions 24A and 24B, and the left and right two portions. The mounting portions provided between the mounting portions are the elastic support portion 24C or the positioning support portion 30, the concave portion corresponds to the concave portion 23a, and the main bone member is the front in the embodiment of the present invention described later. The longitudinal bone member 12c corresponds to the anterior transverse bone member 12d in the embodiment of the present invention described later.

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

1 is a side view of a vehicle seat device according to a first embodiment of the present invention. The enlarged view of 2 parts (headrest periphery part) of FIG. FIG. FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 4 is a perspective view corresponding to FIG. 3. FIG. 7 is an exploded perspective view of the dynamic damper in FIG. 6. Explanatory drawing of the molding method by the foam material of the cushion member of a headrest. The front view corresponding to FIG. 3 which shows 2nd Embodiment of this invention. The perspective view of the headrest which shows 3rd Embodiment of this invention. The perspective view of the vehicle seat apparatus which shows the 1st reference form of this invention. The perspective view of the vehicle seat apparatus which shows the 2nd reference form of this invention. The perspective view of the vehicle seat apparatus which shows the 3rd reference form of this invention.

  First, it demonstrates from 1st Embodiment of this invention shown in FIGS. In the following description, front and rear and left and right are referred to based on an automobile to which the present invention is applied.

  In FIG. 1, the vehicle 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 in which a plurality of support legs 7 and 7 are formed in the lower part, 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 connected to the rear end portion of the seat cushion frame 6, and a seat back frame 10 included in the seat back 3 is connected to these brackets 8 via a pivot 9 so as to be reclining. .

  In addition, a pair of left and right support cylinders 11 and 11 are fixed to the upper end portion of the seat back frame 10, and the headrest 4 is supported by the support cylinders 11 and 11 so that the headrest 4 can be raised and lowered.

  As shown in FIGS. 2 to 6, the headrest 4 is composed of 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 of the headrest frame 12. A dynamic damper D is attached to the frame 12.

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

  Before the cushion member 13 is formed, the dynamic damper D is attached using the front longitudinal bone members 12c and 12c and the front 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, and a damper case 17 having a damper chamber 17 C that houses 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. The weight 15 is supported by the damper case 17 via the elastic sheet 16 in all directions.

  As shown in FIGS. 2, 5, and 7, the weight 15 is made of cast iron and has a hexahedron that is flat in the front-rear direction, and its front surface 15f is formed in a convex curved surface close to a plane. The rear surface 15r is formed as a curved surface that protrudes backward from the front surface 15f. Further, the weight 15 is formed such that the thickness in the front-rear direction and / or the lateral width in the left-right direction gradually increases upward, whereby the center of gravity G of the weight 15 is higher than the center C of the weight 15. 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. In this case, 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, then folded to the rear surface 15r side of the weight 15, and the front surface 15f Are bonded to each other through a double-sided adhesive tape 18. Thus, the weight 15 wrapped with the elastic sheet 16 is accommodated in a front and rear split damper case 17. 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. Thereby, the elastic sheet 16 is prevented from being displaced in the damper chamber 17C, the weight 15 is always held at a predetermined position, and unnecessary movement of the weight 15 is suppressed, and a predetermined vibration damping function can be secured. .

  As shown in FIGS. 2 to 7, the damper case 17 has a shape similar to the outer shape of the weight 15, and thus has a flat box shape in the front-rear direction. The rear wall 17r is formed in a curved surface that is curved so as to largely protrude rearward corresponding to the rear surface 15r of the weight 15, corresponding to the front surface 15f of the weight 15.

  The damper case 17 is divided into a first case half body 17A on the front side and a second case half body 17B on the rear side, and an elastic sheet 16 is interposed between the first and second case half bodies 17A and 17B. A damper chamber 17C that can accommodate the wrapped weight 15 is defined. Each case half 17A, 17B is formed of a synthetic resin.

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

  Also, a fitting groove 20 and a fitting projection wall 21 that can be fitted to each other so as to surround the damper chamber 17C are formed on one and the other of the mating surfaces of both case halves 17A and 17B. A plurality of elastic connection claws 22, 22... Projecting outward are formed at the distal end of 21, and a plurality of connection holes 23, 23... With which these elastic connection claws 22, 22. Is 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 therebetween. The first and second case halves 17A and 17B are also disposed on the upper side walls.

  The claw portions of the elastic coupling claws 22, 22 ... engaged with the coupling holes 23, 23 ... are formed on the outer surface of the case half on the side having the coupling holes 23, 23 ... in the illustrated example, the first case half 17A. A plurality of receiving recesses 23a, 23a,... Are formed by recessing the first case half 17A inwardly from the left and right sides and from above. Therefore, the elastic coupling claws 22, 22... Do not become protrusions from the outer surface of the damper case 17, and the dynamic damper D can be handled easily.

  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. The first and second elastic support portions 24A and 24B are connected to the plate-like arms 25a and 25b projecting outward from the left and right side walls of the second case half body 17B, respectively, and the ends of the arms 25a and 25b. In addition, the front longitudinal bone members 12c and 12c are configured by dominant arc-shaped gripping claws 26a and 26b that can be snap-engaged so as to grip them. That is, the superior arc-shaped gripping claws 26a and 26b can elastically grip the front longitudinal bone members 12c and 12c beyond the respective half circumferences. The arcuate gripping claws 26a and 26b have the openings 27a and 27b directed rearward so as to engage the front longitudinal bone members 12c and 12c from the front. Therefore, the backward load from the occupant's head acts in the direction in which the gripping claws 26a and 26b of the first and second elastic support portions 24A and 24B are engaged with the front longitudinal bone members 12c and 12c. The detachment of the claws 26a and 26b can be prevented. Further, by selecting the lengths of the arms 25a and 25b, the distance between the centers of the gripping claws 26a and 26b is made to coincide with the distance between the centers of the frontal longitudinal bone members 12c and 12c. Engagement with 12c and 12c can be performed accurately.

  The arcuate 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 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. The arcuate gripping claws 26a and 26b are formed so that their rigidity is different from each other. In the illustrated example, the gripping claw 26a of the first elastic support portion 24A is notched at the tip of the gripping claw 26a of the first elastic support portion 24A so that the rigidity of the gripping claw 26b of the second elastic support portion 24B is lower. 28 or the thickness of the gripping claw 26a is set to be thinner than that of the gripping claw 26b. The first and second elastic support portions 24 </ b> A and 24 </ b> B are disposed so as to sandwich the center of gravity G of the weight 15.

  Each gripping claw 26a, 26b is provided with a window hole 29, from which the engagement state between each gripping claw 26a, 26b and the front longitudinal bone member 12c, 12c can be visually confirmed. ing.

  On the other hand, a positioning support portion 30 is integrally formed on the lower side wall of the first case half 17A. The positioning support portion 30 is connected to the plate-like arm 30a protruding downward from the lower side wall of the first case half 17A, and the lower end of the arm 30a, and abuts and engages with the front transverse bone member 12d. The U-shaped contact claw 30b is obtained, and the contact claw 30b abuts and engages with the front transverse bone member 12d from the rear, so that the gripping claws 26a, 26b and the left and right front longitudinal bone members The engagement positions with 12c and 12c are defined. Thus, the mounting position of the damper case 17 on the headrest frame 12 is determined.

  The bases of the arms 25a and 25b of the first and second elastic support portions 24B and the positioning support portion 30 are formed with a thickened portion 31 that reinforces the rigidity of the bases, and further, the first and second elastic support portions 24A. A pair of stoppers 32, 32 that abut against the arms 25a, 25b of 24B and restrict them forward, that is, restrict the deflection of the arms 25a, 25b to the opposite side of 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 17A. Each stopper 32 includes a central wall portion 32a that linearly abuts the back surface of the corresponding gripping claws 26a and 26b, and the gripping claws 26a and 26b from the corresponding arms 25a and 25b that are connected to both ends of the central wall portion 32a. A pair of side wall portions 32b and 32b that abut on the curved surface extending across the back surface of the plate is configured 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 arm 25a, 25b to the gripping claws 26a, 26b, so that the concentrated stress is avoided as much as possible. The bending of 25a and 25b can be regulated effectively. Therefore, even if a large backward load is applied to the damper case 17 from the head of the occupant, the stoppers 32 and 32 abut against the front surfaces of the arms 25a and 25b to restrict the forward bending of the arms 25a and 25b. Thus, unnecessary rearward 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 contributes to strengthening the rigidity of the outer wall of the fitting groove 20.

  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.

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

  Formed on the lower surface of the machine base 35 are molds 37a and 37b that can open and close up and down to form cavities 36 corresponding to the outer shape of the headrest 4 excluding the headrest frame 12. The skin 14 of the headrest 4 is stretched.

  The skin 14 is provided with a foamable synthetic resin pouring port 38 opened on the upper surface thereof, and a support plate 39 fixed to the upper surface of the molding table 35 is provided with a nozzle guide cylinder inserted into the foaming material pouring port 38. 40 is provided. A foam material supply device 40 for inserting the nozzle 41 into the nozzle guide tube 40 is attached to the support plate 39. Further, the main frame members 12 a and 12 a of the headrest frame 12 disposed in the nozzle guide tube 40 are supported by the bracket 43 provided on the support plate 39. Thus, in the skin 14, the dynamic damper D supported by the front longitudinal bone members 12 c and 12 c of the headrest frame 12 is arranged offset to one side of the foam material inlet 38.

  Thus, a 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 that is in close contact with the inner surface of the cavity 36, and foamed to form a headrest frame in the skin 14. 12 and the cushion member 13 that encloses the dynamic damper D can be formed. At that time, the dynamic damper D supported by the front longitudinal bone members 12c and 12c is arranged offset to one side of the foam material inlet 38, so that the foam material 44 is poured into the foam material inlet 38. The pressure does not directly act on the dynamic damper D. Therefore, there is no concern about the elastic dampers 24A and 24B of the dynamic damper D being detached from the front longitudinal bone members 12c and 12c due to the pouring pressure. Further, when the first and second case halves 17A and 17B are joined, the fitting groove 20 and the fitting projecting wall 21 of their mating surfaces are fitted to each other. Intrusion from the joint surfaces of 17A and 17B can be reliably prevented by the labyrinth effect, and an appropriate vibration damping function of the dynamic damper D can be maintained.

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

  The operation of the first embodiment will be described.

  In assembling the dynamic damper D, the weight 15 wrapped with 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 both case halves 17A. , 17B, when the fitting projection wall 21 of the other opening is inserted deeply into the fitting groove 20 of one opening, the elastic coupling claws 22, 22... And the locking holes 23, 23. Thus, the case halves 17A and 17B can be easily coupled without using screws, and the weight 15 is supported on the damper case 17 via the elastic sheet 16 in all directions at the same time. be able to.

  Further, even after the first and second case halves 17A, 17B are joined, the elastic coupling claws 22, 22 ... are elastically deformed to separate them from the coupling holes 23, 23 ... It is also possible to open the damper chamber 17C by separating 17B. Accordingly, the weight 15 and the elastic sheet 16 are taken out from the damper chamber 17C and replaced with ones having characteristics different from those, so that the damping characteristics of the dynamic damper D can be easily adjusted and changed.

  In attaching the assembled dynamic damper D to the headrest frame 12, first, the grip claws 26a, 26b of the first and second elastic support portions 24A, 24B are attached to the left and right front longitudinal bone members 12c, 12c of the headrest frame 12. When pressed from the front, the left and right gripping claws 26a, 26b can snap to the left and right front longitudinal bone members 12c, 12c to grip the front longitudinal bone members 12c, 12c. Accordingly, the damper case 17 can be easily and easily attached to the headrest frame 12 without using special attachment tools such as screws and bands, and for the snap engagement of the gripping claws 26a and 26b. In addition, it is not necessary to apply special processing to the left and right front longitudinal bone members 12c, 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 gripping claws 26a and 26b have different rigidity. Therefore, the manufacturing error between the distance between the centers of the left and right front longitudinal bone members 12c, 12c and the distance between the centers of the left and right gripping claws 26a, 26b is absorbed by relatively little elastic deformation of the left and right gripping claws 26a, 26b. Accordingly, both the gripping claws 26a and 26b can be easily and surely attached to the front longitudinal bone members 12c and 12c in spite of the manufacturing error.

  While the automobile is running, when vibration is transmitted from the automobile floor F to the seat back 3 and the headrest 4 via the seat cushion 2 and the pivot 9, the weight 22 resonates with the elastic deformation of the elastic seat 16 in the dynamic damper D. Thus, the vibration energy of the seat back 3 and the headrest 4 is absorbed and replaced, and the seat back 3 and the headrest 4 can be damped.

  In addition, the dynamic damper D is configured by accommodating a weight 15 wrapped with an elastic sheet 16 in a damper case 17 composed of first and second case halves 17A and 17B that are detachably coupled to each other. The first and second elastic support portions 24A, 24B that engage with the front longitudinal bone members 12c, 12c from the opposite direction to the position of the second case half body 17B, that is, from the front, are formed on the half body 17B. Since the positioning support portion 30 is formed on the case half 17A in a direction opposite to the position of the first case half 17A, that is, from the rear side, the weight 15 vibrates vigorously in the front-rear direction. When a rearward vibration impact force acts on the second case half body 17B, the vibration impact force is applied to the left and right anterior longitudinal bones via the first and second elastic support portions 24A and 24B extending from the second case half body 17B. Wood 12c, is supported by 12c. When a forward vibration impact force acts on the first case half body 17A, the vibration impact force is supported by the front transverse bone member 12d via the positioning support portion 30 extending from the first case half body 17A. Accordingly, the vibration impact force in any direction before and after does not act in the direction in which the first and second case halves 17A and 17B are separated, thereby preventing the damper case 17 from being disassembled by the vibration impact force of the weight 15. it can. Further, since the vibration of the weight 15 is suppressed from being transmitted to the cushion member 13 by the damper case 17, it does not give the passenger an uncomfortable feeling.

  Further, since the first and second elastic support portions 24A and 24B are disposed 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, the plurality of sets of elastic connecting claws 22, 22... And connecting holes 23, 23... Formed in the first and second case halves 17A and 17B are arranged at positions sandwiching the weight 15, so that the weight 15 Are effectively supported by a plurality of sets of elastic connecting claws 22, 22... And connecting holes 23, 23... That are engaged with each other to effectively deform the first and second case halves 17A and 17B. Can be prevented.

  Further, the weight 15 is formed such that its center of gravity G is located above the center C of the weight 15, so that the center of gravity G of the weight 22 is from the support point of the vibration system composed of the seat cushion 2 and the headrest 4. Therefore, the vibration damping function of the dynamic damper D can be provided with the weight 22 having a relatively small mass. In addition, the distance A between the side surface of the weight 15 and the inner surface of the damper chamber 17 </ b> C facing the side surface with the elastic sheet 16 interposed therebetween is separated from the support point 9 of one vibration system including the seat back 3 and the headrest 4. Since the amplitude of the weight 15 increases as the distance from the support point 9 increases, the vibration damping effect can be increased reasonably.

  The damper case 17 has a box shape that is flat in the front-rear direction corresponding to the outer shape of the weight 15, and its front wall 17f is formed in a curved surface close to a plane corresponding to the front surface 15f of the weight 15. Since the rear wall 17r is formed in a curved surface that is larger than the front wall 17f with the convex side facing rearward corresponding to the rear surface 15r of the weight 15, the occupant's head is placed on the damper case via the cushion member 13. Even when the front wall 17f of the damper 17 is strongly pressed, the head of the occupant is supported by a relatively large area of the front wall 17f of the damper case 17, so that the occupant does not feel uncomfortable. Moreover, the curved shapes of the front wall 17f and the rear wall 17r contribute to the rigidity enhancement of the damper case 17. The rear surface of the weight 15 and the rear wall 17r of the damper case 17 which are further curved allow the thickness of the weight 15 to be increased by effectively using the space in the headrest 4 and improve the vibration damping function of the dynamic damper D. Can contribute.

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

  In the second embodiment, the damper case 17 is formed such that three or more elastic support portions 24 </ b> A to 24 </ b> C supported by the headrest frame 12 are positioned at the apex of the polygon 34 surrounding the gravity center 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 dominant arc-shaped gripping claw 26c, similarly to the first and second elastic support portions 24A and 24B. The headrest frame 12 is disposed so as to avoid the upper surface of the damper case 17.

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

  Since the other configuration is the same as that of the previous embodiment, the same reference numerals are assigned to the portions corresponding to those of the previous embodiment in FIG.

  According to the second embodiment, the damper case 17 is formed such that the three or more elastic support portions 24 </ b> A to 24 </ b> C supported by the headrest frame 12 are positioned at the apex of the polygon 34 surrounding the gravity center G of the weight 15. As a result, 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 reduce the ride comfort. Can contribute to improvement.

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

  In the third embodiment, the dynamic damper D in the first embodiment is attached to the left and right upper bone members 12 b and 12 b 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 with the left and right upper bone members 12b and 12b from above, and the positioning support portion 30 is connected to 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 by being brought into contact with and engaged with the cross member 46 connecting the rear end portions from below. Since the other configuration is the same as that of the first embodiment, portions corresponding to those of the first embodiment in FIG. 10 are denoted by the same reference numerals, and redundant description is omitted.

  According to the third embodiment, the space between the left and right upper bone members 12b, 12b is effectively utilized for the installation of the dynamic damper D, so that the front portion of the cushion member 13 of the headrest 4 where the head of the occupant comes into contact. To secure a sufficient thickness, and to obtain a sufficient distance from the support point of the vibration system composed of the seat cushion 2 and the headrest 4 to the center of gravity G of the weight 22 to enhance the vibration damping function of the dynamic damper D. it can.

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

  In the first reference embodiment, in the seat back 3, a dynamic damper D including a damper case 17 having a substantially right triangular shape in front view is disposed at the inner corners of the left and right corners of the upper portion of the seat back frame 10, A pair of elastic support portions 24A, 24B formed on the upper surface and one side surface of the damper case 17 are snap-engaged with the longitudinal bone member 10a and the lateral bone member 10b of the seat back frame 10, respectively. The structure of the dynamic damper D is basically the same except that the shape of the damper case 17 and the weight 15 accommodated therein is different from that of the first embodiment.

  According to the first reference embodiment, the vibration of the seat back 3 can be effectively suppressed by the action of the dynamic damper D arranged at the uppermost part of the seat back frame 10. In addition, the dead space at the inner corner of the upper corner of the seat back frame 10 can be effectively used for the installation of the dynamic damper D. The dynamic damper D may be disposed only at the inner corner of one of the left and right corners of the upper portion of the seat back frame 10.

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

  In the second reference embodiment, a pair of inclined bone portions 49a, 49a inclined in opposite directions at the center of the corrugated bone member 49 that integrally connects the upper portions of the left and right vertical bone members 10a, 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. At that time, the pair of elastic support portions 24A and 24B is disposed obliquely corresponding to the pair of inclined bone portions 49a and 49a, and thereby the pair of elastic support portions 24A and 24B is paired with the pair of inclined bone portions 49a and 49a. Vertical movement at is prevented. The basic structure of the dynamic damper D is the same as that of the first embodiment. Thus, the vibration of the seat back 3 can be effectively suppressed by the action of the single dynamic damper D attached to the upper portion and the center portion of the seat back frame 10.

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

  In the third reference embodiment, for damping the seat cushion 2, the damper case 17 of the dynamic damper D is attached to the front reinforcing plate 6a that is welded to the front portion of the seat cushion frame 6 and extends in the left-right direction. In this case, the damper case 17 is formed with a pair of elastic support portions 50, 50 on its upper surface. Each elastic support part 50 is comprised by the axial part 50a which protrudes from the outer surface of the damper case 17, and the arrowhead-like latching protrusion 50b formed in the front-end | tip of this axial part 50a, and is elastic of the latching protrusion 50b. A slit 50c is provided from the tip of the locking projection 50b to the shaft portion 50a so as to reduce the diameter. A rubber elastic collar 52 is fitted on the shaft portion 50a. On the other hand, the front reinforcing plate 6a is provided with a pair of locking holes 51, 51 corresponding to the pair of elastic support portions 50, 50. The elastic support portions 50, 50 are formed in the locking holes 51, 51, respectively. By pushing the locking projections 50b from below, each locking projection 50b is not elastically reduced 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. Separation 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 due to the repulsive force, the locking projection 50b is loosely placed on the front surface of the front reinforcing plate 6a. It is kept without. Except for the elastic support portions 50, 50, the structure of the damper case 17, the weight 15 accommodated in the damper case 17, and the elastic sheet 16 enclosing it is basically the same as that of the first embodiment. Therefore, in FIG. 12, the same reference numerals are given to the portions corresponding to those of the first embodiment, and the overlapping description is omitted.

  According to the third reference embodiment, the vibration of the seat cushion 2 can be effectively suppressed by the action of the dynamic damper D disposed 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 attached to the front reinforcing plate 6a by a simple pushing operation. The engaging holes 51 and 51 can be snap-engaged, and the damper case 17 can be easily attached.

  The present invention is not limited to the above-described 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 half bodies 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. The seat device of the present invention can be applied not only to automobiles but also to railway vehicles, aircrafts and the like. Further, the seat S can be installed overhanging 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 17B ... Second case half 23a ... Recesses 24A, 24B, 24C ... Mounting part (elastic support part)
30 ... Mounting part (positioning support part)

The present invention is a dynamic damper which is attached to the seat frame for a vehicle comprising a cushion member, the dynamic damper device headrest device having a, and to the improvement of a seat apparatus for a vehicle equipped with the dynamic damper device.

In such a vehicle seat device, a dynamic damper device is constituted by a housing, a weight accommodated in the housing so as to be able to vibrate, and an elastic member interposed between the weight and the housing. It is known as disclosed in Patent Document 1 below.

JP 2002-242986 A

Dynamic damper device in a vehicle seat device disclosed in Patent Document 1, the housing after accommodating the weight and the elastic member, the entire are non-degradable integrated, the dynamic damper is assembled once, control Even if it is necessary to adjust or change the vibration characteristics, the weight and the elastic member cannot be replaced with ones having different characteristics, and a new dynamic damper must be manufactured, which is uneconomical. In addition, since the housing is not provided with an attachment portion to the seat, a special attachment device such as a band has to be used for attachment to the seat, and the attachment work is troublesome.

  The present invention has been made in view of such circumstances, and makes it possible to replace a weight and an elastic member for adjusting or changing a damping characteristic, and also to attach a damper case (housing) to a seat. An object of the present invention is to provide an excellent vehicle seat apparatus.

To achieve the above object, the present invention provides a dynamic damper which is attached to the seat frame for a vehicle comprising a cushion member, and the weight to be housed in the cushion member, a member separate from the said cushion member in is formed, the first feature that it is constituted by an elastic member which is interposed between the cushion member and the weight.

The present invention, in addition to the first feature, the the said elastic member and the weight is replaceably accommodated in a case which is housed in the cushion member and the second said Rukoto.

Furthermore, in addition to the second feature of the present invention , the case is divided into two to cover the elastic member from the front-rear direction of the seat, and a plurality of claws that close the mating surfaces of the two case halves include the case, so as to surround the elastic member from the U-shaped three-way, are arranged on the mating surface of one of said case halves to a third feature of Rukoto.

Furthermore, in addition to the second or third feature, the present invention is provided with attachment portions that are engaged with the frame on the left and right side surfaces of the case, respectively, in the front view of the seat. member is disposed in a sandwiched between the mounting portion of the left and right positions and a fourth said Rukoto.

Furthermore, the present invention, in addition to any one of the first to fourth features, the frame includes a main bone member extending in the vertical direction and an upper bone member extending forward from the upper end of the main bone member. The fifth feature is that the elastic member is in a position overlapping the upper bone member in a side view of the sheet .

In addition to the first to fifth features of the present invention, the frame includes a main bone member extending in the vertical direction, an upper bone member extending forward from the upper end of the main bone member, and the upper bone member. It has a front longitudinal bone member that extends downward from the front end, and the elastic member is in a position overlapping the front longitudinal bone member and the weight in a side view of the sheet .

Furthermore, the present invention, a headrest apparatus der Rukoto with dynamic damper device according to any one of the first to sixth features of the seventh aspect of.

Furthermore, an eighth feature of the present invention is a vehicle seat device including the dynamic damper device according to any one of the first to seventh features.

The cushion member is a seat cushion 2 in an embodiment of the present invention described later, the seat is an automobile seat S , the frame is a headrest frame 12 , the dynamic damper device is a dynamic damper D , and the weight. Is the weight 15 , the elastic member is the elastic sheet 16 , the case is the damper case 17 , the case half is the first and second case half 17A, 17B , and the claw is the elastic connecting claw 22 . The attachment portion corresponds to the elastic support portions 24A and 24B , the main bone member corresponds to the main bone member 12a , the upper bone member corresponds to the upper bone member 12b , and the front longitudinal bone member corresponds to the front longitudinal bone member 12c .

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

1 is a side view of a vehicle seat device according to a first embodiment of the present invention. The enlarged view of 2 parts (headrest periphery part) of FIG. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 2. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 4 is a perspective view corresponding to FIG. 3. FIG. 7 is an exploded perspective view of the dynamic damper in FIG. 6. Explanatory drawing of the molding method by the foam material of the cushion member of a headrest. The front view corresponding to FIG. 3 which shows 2nd Embodiment of this invention. The perspective view of the headrest which shows 3rd Embodiment of this invention. The perspective view of the vehicle seat apparatus which shows 4th Embodiment of this invention. The perspective view of the vehicle seat apparatus which shows 5th Embodiment of this invention. The perspective view of the vehicle seat apparatus which shows 6th Embodiment of this invention.

  First, it demonstrates from 1st Embodiment of this invention shown in FIGS. In the following description, front and rear and left and right are referred to based on an automobile to which the present invention is applied.

  In FIG. 1, the vehicle 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 in which a plurality of support legs 7 and 7 are formed in the lower part, 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 connected to the rear end portion of the seat cushion frame 6, and a seat back frame 10 included in the seat back 3 is connected to these brackets 8 via a pivot 9 so as to be reclining. .

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

  As shown in FIGS. 2 to 6, the headrest 4 is composed of 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 of the headrest frame 12. A dynamic damper D is attached to the frame 12.

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

  Before the cushion member 13 is formed, the dynamic damper D is attached using the front longitudinal bone members 12c and 12c and the front 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, and a damper case 17 having a damper chamber 17 C that houses 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. The weight 15 is supported by the damper case 17 via the elastic sheet 16 in all directions.

  As shown in FIGS. 2, 5, and 7, the weight 15 is made of cast iron and has a hexahedron that is flat in the front-rear direction, and its front surface 15f is formed in a convex curved surface close to a plane. The rear surface 15r is formed as a curved surface that protrudes backward from the front surface 15f. Further, the weight 15 is formed such that the thickness in the front-rear direction and / or the lateral width in the left-right direction gradually increases upward, whereby the center of gravity G of the weight 15 is higher than the center C of the weight 15. 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. In this case, 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, then folded to the rear surface 15r side of the weight 15, and the front surface 15f Are bonded to each other through a double-sided adhesive tape 18. Thus, the weight 15 wrapped with the elastic sheet 16 is accommodated in a front and rear split damper case 17. 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. Thereby, the elastic sheet 16 is prevented from being displaced in the damper chamber 17C, the weight 15 is always held at a predetermined position, and unnecessary movement of the weight 15 is suppressed, and a predetermined vibration damping function can be secured. .

  As shown in FIGS. 2 to 7, the damper case 17 has a shape similar to the outer shape of the weight 15, and thus has a flat box shape in the front-rear direction. The rear wall 17r is formed in a curved surface that is curved so as to largely protrude rearward corresponding to the rear surface 15r of the weight 15, corresponding to the front surface 15f of the weight 15.

  The damper case 17 is divided into a first case half body 17A on the front side and a second case half body 17B on the rear side, and an elastic sheet 16 is interposed between the first and second case half bodies 17A and 17B. A damper chamber 17C that can accommodate the wrapped weight 15 is defined. Each case half 17A, 17B is formed of a synthetic resin.

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

  Also, a fitting groove 20 and a fitting projection wall 21 that can be fitted to each other so as to surround the damper chamber 17C are formed on one and the other of the mating surfaces of both case halves 17A and 17B. A plurality of elastic connection claws 22, 22... Projecting outward are formed at the distal end of 21, and a plurality of connection holes 23, 23... With which these elastic connection claws 22, 22. Is 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 therebetween. The first and second case halves 17A and 17B are also disposed on the upper side walls.

  The claw portions of the elastic coupling claws 22, 22 ... engaged with the coupling holes 23, 23 ... are formed on the outer surface of the case half on the side having the coupling holes 23, 23 ... in the illustrated example, the first case half 17A. A plurality of receiving recesses 23a, 23a,... Are formed by recessing the first case half 17A inwardly from the left and right sides and from above. Therefore, the elastic coupling claws 22, 22... Do not become protrusions from the outer surface of the damper case 17, and the dynamic damper D can be handled easily.

  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. The first and second elastic support portions 24A and 24B are connected to the plate-like arms 25a and 25b projecting outward from the left and right side walls of the second case half body 17B, respectively, and the ends of the arms 25a and 25b. In addition, the front longitudinal bone members 12c and 12c are configured by dominant arc-shaped gripping claws 26a and 26b that can be snap-engaged so as to grip them. That is, the superior arc-shaped gripping claws 26a and 26b can elastically grip the front longitudinal bone members 12c and 12c beyond the respective half circumferences. The arcuate gripping claws 26a and 26b have the openings 27a and 27b directed rearward so as to engage the front longitudinal bone members 12c and 12c from the front. Therefore, the backward load from the occupant's head acts in the direction in which the gripping claws 26a and 26b of the first and second elastic support portions 24A and 24B are engaged with the front longitudinal bone members 12c and 12c. The detachment of the claws 26a and 26b can be prevented. Further, by selecting the lengths of the arms 25a and 25b, the distance between the centers of the gripping claws 26a and 26b is made to coincide with the distance between the centers of the frontal longitudinal bone members 12c and 12c. Engagement with 12c and 12c can be performed accurately.

  The arcuate 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 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. The arcuate gripping claws 26a and 26b are formed so that their rigidity is different from each other. In the illustrated example, the gripping claw 26a of the first elastic support portion 24A is notched at the tip of the gripping claw 26a of the first elastic support portion 24A so that the rigidity of the gripping claw 26b of the second elastic support portion 24B is lower. 28 or the thickness of the gripping claw 26a is set to be thinner than that of the gripping claw 26b. The first and second elastic support portions 24 </ b> A and 24 </ b> B are disposed so as to sandwich the center of gravity G of the weight 15.

  Each gripping claw 26a, 26b is provided with a window hole 29, from which the engagement state between each gripping claw 26a, 26b and the front longitudinal bone member 12c, 12c can be visually confirmed. ing.

  On the other hand, a positioning support portion 30 is integrally formed on the lower side wall of the first case half 17A. The positioning support portion 30 is connected to the plate-like arm 30a protruding downward from the lower side wall of the first case half 17A, and the lower end of the arm 30a, and abuts and engages with the front transverse bone member 12d. The U-shaped contact claw 30b is obtained, and the contact claw 30b abuts and engages with the front transverse bone member 12d from the rear, so that the gripping claws 26a, 26b and the left and right front longitudinal bone members The engagement positions with 12c and 12c are defined. Thus, the mounting position of the damper case 17 on the headrest frame 12 is determined.

  The bases of the arms 25a and 25b of the first and second elastic support portions 24B and the positioning support portion 30 are formed with a thickened portion 31 that reinforces the rigidity of the bases, and further, the first and second elastic support portions 24A. A pair of stoppers 32, 32 that abut against the arms 25a, 25b of 24B and restrict them forward, that is, restrict the deflection of the arms 25a, 25b to the opposite side of 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 17A. Each stopper 32 includes a central wall portion 32a that linearly abuts the back surface of the corresponding gripping claws 26a and 26b, and the gripping claws 26a and 26b from the corresponding arms 25a and 25b that are connected to both ends of the central wall portion 32a. A pair of side wall portions 32b and 32b that abut on the curved surface extending across the back surface of the plate is configured 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 arm 25a, 25b to the gripping claws 26a, 26b, so that the concentrated stress is avoided as much as possible. The bending of 25a and 25b can be regulated effectively. Therefore, even if a large backward load is applied to the damper case 17 from the head of the occupant, the stoppers 32 and 32 abut against the front surfaces of the arms 25a and 25b to restrict the forward bending of the arms 25a and 25b. Thus, unnecessary rearward 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 contributes to strengthening the rigidity of the outer wall of the fitting groove 20.

  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.

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

  Formed on the lower surface of the machine base 35 are molds 37a and 37b that can open and close up and down to form cavities 36 corresponding to the outer shape of the headrest 4 excluding the headrest frame 12. The skin 14 of the headrest 4 is stretched.

  The skin 14 is provided with a foamable synthetic resin pouring port 38 opened on the upper surface thereof, and a support plate 39 fixed to the upper surface of the molding table 35 is provided with a nozzle guide cylinder inserted into the foaming material pouring port 38. 40 is provided. A foam material supply device 40 for inserting the nozzle 41 into the nozzle guide tube 40 is attached to the support plate 39. Further, the main frame members 12 a and 12 a of the headrest frame 12 disposed in the nozzle guide tube 40 are supported by the bracket 43 provided on the support plate 39. Thus, in the skin 14, the dynamic damper D supported by the front longitudinal bone members 12 c and 12 c of the headrest frame 12 is arranged offset to one side of the foam material inlet 38.

  Thus, a 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 that is in close contact with the inner surface of the cavity 36, and foamed to form a headrest frame in the skin 14. 12 and the cushion member 13 that encloses the dynamic damper D can be formed. At that time, the dynamic damper D supported by the front longitudinal bone members 12c and 12c is arranged offset to one side of the foam material inlet 38, so that the foam material 44 is poured into the foam material inlet 38. The pressure does not directly act on the dynamic damper D. Therefore, there is no concern about the elastic dampers 24A and 24B of the dynamic damper D being detached from the front longitudinal bone members 12c and 12c due to the pouring pressure. Further, when the first and second case halves 17A and 17B are joined, the fitting groove 20 and the fitting projecting wall 21 of their mating surfaces are fitted to each other. Intrusion from the joint surfaces of 17A and 17B can be reliably prevented by the labyrinth effect, and an appropriate vibration damping function of the dynamic damper D can be maintained.

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

  The operation of the first embodiment will be described.

  In assembling the dynamic damper D, the weight 15 wrapped with 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 both case halves 17A. , 17B, when the fitting projection wall 21 of the other opening is inserted deeply into the fitting groove 20 of one opening, the elastic coupling claws 22, 22... And the locking holes 23, 23. Thus, the case halves 17A and 17B can be easily coupled without using screws, and the weight 15 is supported on the damper case 17 via the elastic sheet 16 in all directions at the same time. be able to.

  Further, even after the first and second case halves 17A, 17B are joined, the elastic coupling claws 22, 22 ... are elastically deformed to separate them from the coupling holes 23, 23 ... It is also possible to open the damper chamber 17C by separating 17B. Accordingly, the weight 15 and the elastic sheet 16 are taken out from the damper chamber 17C and replaced with ones having characteristics different from those, so that the damping characteristics of the dynamic damper D can be easily adjusted and changed.

  In attaching the assembled dynamic damper D to the headrest frame 12, first, the grip claws 26a, 26b of the first and second elastic support portions 24A, 24B are attached to the left and right front longitudinal bone members 12c, 12c of the headrest frame 12. When pressed from the front, the left and right gripping claws 26a, 26b can snap to the left and right front longitudinal bone members 12c, 12c to grip the front longitudinal bone members 12c, 12c. Accordingly, the damper case 17 can be easily and easily attached to the headrest frame 12 without using special attachment tools such as screws and bands, and for the snap engagement of the gripping claws 26a and 26b. In addition, it is not necessary to apply special processing to the left and right front longitudinal bone members 12c, 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 gripping claws 26a and 26b have different rigidity. Therefore, the manufacturing error between the distance between the centers of the left and right front longitudinal bone members 12c, 12c and the distance between the centers of the left and right gripping claws 26a, 26b is absorbed by relatively little elastic deformation of the left and right gripping claws 26a, 26b. Accordingly, both the gripping claws 26a and 26b can be easily and surely attached to the front longitudinal bone members 12c and 12c in spite of the manufacturing error.

  While the automobile is running, when vibration is transmitted from the automobile floor F to the seat back 3 and the headrest 4 via the seat cushion 2 and the pivot 9, the weight 22 resonates with the elastic deformation of the elastic seat 16 in the dynamic damper D. Thus, the vibration energy of the seat back 3 and the headrest 4 is absorbed and replaced, and the seat back 3 and the headrest 4 can be damped.

  In addition, the dynamic damper D is configured by accommodating a weight 15 wrapped with an elastic sheet 16 in a damper case 17 composed of first and second case halves 17A and 17B that are detachably coupled to each other. The first and second elastic support portions 24A, 24B that engage with the front longitudinal bone members 12c, 12c from the opposite direction to the position of the second case half body 17B, that is, from the front, are formed on the half body 17B. Since the positioning support portion 30 is formed on the case half 17A in a direction opposite to the position of the first case half 17A, that is, from the rear side, the weight 15 vibrates vigorously in the front-rear direction. When a rearward vibration impact force acts on the second case half body 17B, the vibration impact force is applied to the left and right anterior longitudinal bones via the first and second elastic support portions 24A and 24B extending from the second case half body 17B. Wood 12c, is supported by 12c. When a forward vibration impact force acts on the first case half body 17A, the vibration impact force is supported by the front transverse bone member 12d via the positioning support portion 30 extending from the first case half body 17A. Accordingly, the vibration impact force in any direction before and after does not act in the direction in which the first and second case halves 17A and 17B are separated, thereby preventing the damper case 17 from being disassembled by the vibration impact force of the weight 15. it can. Further, since the vibration of the weight 15 is suppressed from being transmitted to the cushion member 13 by the damper case 17, it does not give the passenger an uncomfortable feeling.

  Further, since the first and second elastic support portions 24A and 24B are disposed 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, the plurality of sets of elastic connecting claws 22, 22... And connecting holes 23, 23... Formed in the first and second case halves 17A and 17B are arranged at positions sandwiching the weight 15, so that the weight 15 Are effectively supported by a plurality of sets of elastic connecting claws 22, 22... And connecting holes 23, 23... That are engaged with each other to effectively deform the first and second case halves 17A and 17B. Can be prevented.

  Further, the weight 15 is formed such that its center of gravity G is located above the center C of the weight 15, so that the center of gravity G of the weight 22 is from the support point of the vibration system composed of the seat cushion 2 and the headrest 4. Therefore, the vibration damping function of the dynamic damper D can be provided with the weight 22 having a relatively small mass. In addition, the distance A between the side surface of the weight 15 and the inner surface of the damper chamber 17 </ b> C facing the side surface with the elastic sheet 16 interposed therebetween is separated from the support point 9 of one vibration system including the seat back 3 and the headrest 4. Since the amplitude of the weight 15 increases as the distance from the support point 9 increases, the vibration damping effect can be increased reasonably.

  The damper case 17 has a box shape that is flat in the front-rear direction corresponding to the outer shape of the weight 15, and its front wall 17f is formed in a curved surface close to a plane corresponding to the front surface 15f of the weight 15. Since the rear wall 17r is formed in a curved surface that is larger than the front wall 17f with the convex side facing rearward corresponding to the rear surface 15r of the weight 15, the occupant's head is placed on the damper case via the cushion member 13. Even when the front wall 17f of the damper 17 is strongly pressed, the head of the occupant is supported by a relatively large area of the front wall 17f of the damper case 17, so that the occupant does not feel uncomfortable. Moreover, the curved shapes of the front wall 17f and the rear wall 17r contribute to the rigidity enhancement of the damper case 17. The rear surface of the weight 15 and the rear wall 17r of the damper case 17 which are further curved allow the thickness of the weight 15 to be increased by effectively using the space in the headrest 4 and improve the vibration damping function of the dynamic damper D. Can contribute.

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

  In the second embodiment, the damper case 17 is formed such that three or more elastic support portions 24 </ b> A to 24 </ b> C supported by the headrest frame 12 are positioned at the apex of the polygon 34 surrounding the gravity center 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 dominant arc-shaped gripping claw 26c, similarly to the first and second elastic support portions 24A and 24B. The headrest frame 12 is disposed so as to avoid the upper surface of the damper case 17.

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

  Since the other configuration is the same as that of the previous embodiment, the same reference numerals are assigned to the portions corresponding to those of the previous embodiment in FIG.

  According to the second embodiment, the damper case 17 is formed such that the three or more elastic support portions 24 </ b> A to 24 </ b> C supported by the headrest frame 12 are positioned at the apex of the polygon 34 surrounding the gravity center G of the weight 15. As a result, 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 reduce the ride comfort. Can contribute to improvement.

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

  In the third embodiment, the dynamic damper D in the first embodiment is attached to the left and right upper bone members 12 b and 12 b 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 with the left and right upper bone members 12b and 12b from above, and the positioning support portion 30 is connected to 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 by being brought into contact with and engaged with the cross member 46 connecting the rear end portions from below. Since the other configuration is the same as that of the first embodiment, portions corresponding to those of the first embodiment in FIG. 10 are denoted by the same reference numerals, and redundant description is omitted.

  According to the third embodiment, the space between the left and right upper bone members 12b, 12b is effectively utilized for the installation of the dynamic damper D, so that the front portion of the cushion member 13 of the headrest 4 where the head of the occupant comes into contact. To secure a sufficient thickness, and to obtain a sufficient distance from the support point of the vibration system composed of the seat cushion 2 and the headrest 4 to the center of gravity G of the weight 22 to enhance the vibration damping function of the dynamic damper D. it can.

Next, a fourth embodiment of the present invention shown in FIG. 11 will be described.

In the fourth embodiment, in the seat back 3, a dynamic damper D including a damper case 17 having a substantially right triangular shape in front view is disposed at the inner corners of the left and right corners of the upper portion of the seat back frame 10, A pair of elastic support portions 24A, 24B formed on the upper surface and one side surface of the damper case 17 are snap-engaged with the longitudinal bone member 10a and the lateral bone member 10b of the seat back frame 10, respectively. The structure of the dynamic damper D is basically the same except that the shape of the damper case 17 and the weight 15 accommodated therein is different from that of the first embodiment.

According to the fourth embodiment, the vibration of the seat back 3 can be effectively suppressed by the action of the dynamic damper D disposed at the top of the seat back frame 10. In addition, the dead space at the inner corner of the upper corner of the seat back frame 10 can be effectively used for the installation of the dynamic damper D. The dynamic damper D may be disposed only at the inner corner of one of the left and right corners of the upper portion of the seat back frame 10.

Next, a fifth embodiment of the present invention shown in FIG. 12 will be described.

In this fifth embodiment, a pair of inclined bone portions 49a, 49a inclined in opposite directions at the center of a corrugated bone member 49 that integrally connects the upper portions of the left and right vertical bone members 10a, 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. At that time, the pair of elastic support portions 24A and 24B is disposed obliquely corresponding to the pair of inclined bone portions 49a and 49a, and thereby the pair of elastic support portions 24A and 24B is paired with the pair of inclined bone portions 49a and 49a. Vertical movement at is prevented. The basic structure of the dynamic damper D is the same as that of the first embodiment. Thus, the vibration of the seat back 3 can be effectively suppressed by the action of the single dynamic damper D attached to the upper portion and the center portion of the seat back frame 10.

Finally, a sixth embodiment of the present invention shown in FIG. 13 will be described.

In the sixth embodiment , for damping the seat cushion 2, the damper case 17 of the dynamic damper D is attached to the front reinforcing plate 6a that is welded to the front portion of the seat cushion frame 6 and extends in the left-right direction. In this case, the damper case 17 is formed with a pair of elastic support portions 50, 50 on its upper surface. Each elastic support part 50 is comprised by the axial part 50a which protrudes from the outer surface of the damper case 17, and the arrowhead-like latching protrusion 50b formed in the front-end | tip of this axial part 50a, and is elastic of the latching protrusion 50b. A slit 50c is provided from the tip of the locking projection 50b to the shaft portion 50a so as to reduce the diameter. A rubber elastic collar 52 is fitted on the shaft portion 50a. On the other hand, the front reinforcing plate 6a is provided with a pair of locking holes 51, 51 corresponding to the pair of elastic support portions 50, 50. The elastic support portions 50, 50 are formed in the locking holes 51, 51, respectively. By pushing the locking projections 50b from below, each locking projection 50b is not elastically reduced 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. Separation 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 due to the repulsive force, the locking projection 50b is loosely placed on the front surface of the front reinforcing plate 6a. It is kept without. Except for the elastic support portions 50, 50, the structure of the damper case 17, the weight 15 accommodated in the damper case 17, and the elastic sheet 16 enclosing it is basically the same as that of the first embodiment. Therefore, in FIG. 12, the same reference numerals are given to the portions corresponding to those of the first embodiment, and the overlapping description is omitted.

According to the sixth embodiment, the vibration of the seat cushion 2 can be effectively suppressed by the action of the dynamic damper D disposed 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 attached to the front reinforcing plate 6a by a simple pushing operation. The engaging holes 51 and 51 can be snap-engaged, and the damper case 17 can be easily attached.

The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist thereof. For example, the fourth and sixth embodiments can be used in combination with the first to third embodiments. Further, one of the first and second half bodies 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. The seat device of the present invention can be applied not only to automobiles but also to railway vehicles, aircrafts and the like. Further, the seat S can be installed overhanging the wall surface of the vehicle.

D ・ ・ ・ ・ ・ ・ Dynamic damper device (dynamic damper)
S ··· Seat (car seat)
2. Cushion member (seat cushion)
12. Frame ( headrest frame )
12a... Main bone member
12b... Upper bone member
12c ··· Front longitudinal bone member 15 ··· Weight 16 ··· Elastic member (elastic sheet)
17 ... Case ( damper case )
17A , 17B ... Case half ( first and second case half )
22 ... Nail (elastic coupling claw)
24A, 24B ... Mounting part (elastic support part)

Claims (8)

In a vehicle seat device, wherein a dynamic damper is attached to a seat frame installed on a vehicle having a cushion member,
The dynamic damper is formed as a separate member from a damper case composed of first and second case halves coupled to each other in a separable manner, a weight housed in the damper case, and the cushion member, An elastic member interposed between the weight and the damper case so as to allow vibration of the weight,
A plurality of attachment portions to be attached to the frame are formed in the damper case,
In the front view of the seat, a part of the attachment portion engages with the frame at two left and right positions of the damper case, and between the two right and left attachment portions, The vehicle seat device is characterized in that another mounting portion is provided.   Of the frame, the portion where the left and right attachment portions are engaged is the portion extending in the vertical direction of the seat, and the attachment portion provided between the left and right attachment portions is engaged. The vehicle seat device according to claim 1, wherein the portion to be extended is a portion extending in a left-right direction of the seat.   The frame is a headrest frame, and has a pair of left and right main bone members extending in the vertical direction of the seat, and the two left and right attachment portions are engaged with the main bone member, The vehicle seat device according to claim 1, wherein the weight and the main bone member overlap each other in a vertical direction of the seat.   The vehicle seat device according to claim 3, wherein the two left and right attachment portions are positioned so as to overlap the weight and the main bone member in the vertical direction of the seat.   The frame is a headrest frame, and has a bone member extending in the left-right direction of the seat. 5. The vehicle seat device according to claim 1, wherein the weight and the bone member overlap each other in the left-right direction of the seat.   6. The vehicle according to claim 5, wherein an attachment portion provided between the two attachment portions on the left and right sides is in a position overlapping with the weight and the bone member in a left-right direction of the seat. Sheet device.   The front and rear two attachment portions are engaged with the frame so as to cover the front surface of the frame in a front view of the seat. Vehicle seat device.   In the front view of the seat, the damper case is provided with recesses in which the damper case is recessed inward from both the left and right sides, and these recesses are positioned to overlap the weight in the vertical direction. The vehicle seat device according to claim 1, wherein the vehicle seat device is a vehicle.

Images