JP2020111295A - Dynamic damper, headrest and vehicular sheet - Google Patents

Abstract

To provide a dynamic damper that can efficiently exert damping effect against vibration in a specific direction that should be damped primarily by regulating a weight from moving in a predetermined direction.SOLUTION: A dynamic damper D includes: a weight 15; elastic members S1 to S3 for supporting the weight 15 so as to be capable of vibrating; and movement regulating means WG for regulating the weight 15 from moving in a predetermined direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a dynamic damper that includes a weight and an elastic member that supports the weight so that the weight can vibrate, and a headrest and a vehicle seat that include the dynamic damper.

A method in which the above-mentioned dynamic damper is applied to, for example, a vehicle seat and is used to reduce seat vibration is conventionally known as disclosed in Japanese Patent Application Laid-Open No. 2004-242242.

Japanese Patent No. 6110853

In the dynamic damper disclosed in the above-mentioned Patent Document 1, since the movement restricting means for restricting the movement of the weight in the specific direction is not provided, the weight vibrates in all the front-back, left-right, and up-down directions of the seat. It is designed to be able to exert its vibration damping function.

However, depending on the vibration damping target (for example, vehicle seat), it is assumed that the dynamic damper is desired to dampen only the vibration in the specific direction. In this case, if the weight is displaced and vibrates in a direction other than the specific direction, there is a risk that the motion of the weight will be wasted to that extent, and the damping effect against vibration in the specific direction, which is supposed to be damped, will be reduced.

The present invention has been made in view of the above circumstances, and it is possible to regulate the movement of the weight in a predetermined direction, and to efficiently exert a vibration damping effect on vibration in a specific direction that should be originally damped. An object of the present invention is to provide a damper, a headrest and a vehicle seat equipped with a dynamic damper.

In order to achieve the above object, the present invention provides a dynamic damper including a weight and an elastic member that supports the weight in a vibrating manner, and a movement restricting unit that restricts movement of the weight in a predetermined direction. The first feature is the provision.

In addition to the first feature of the present invention, in addition to the first feature, the movement restricting means includes a weight guide portion that slidably guides the movement of the weight in a specific direction different from the predetermined direction. The second characteristic.

In addition to the first or second feature, the present invention includes a damper case that accommodates the weight and the elastic member, and the weight guide portion avoids the elastic member inside the damper case. The third feature is that it is arranged at a position.

Further, in addition to the third characteristic, the present invention has a fourth characteristic that the weight guide portion is provided so as to project from the inner surface of the damper case.

Further, in addition to the fourth characteristic, the present invention has a fifth characteristic that at least a pair of the weight guide portions are provided so as to project from inner surfaces of the damper case which face each other.

Furthermore, in the present invention, in addition to the third to fifth characteristics, the elastic member covers the outer side surface between the one end surface and the other end surface of the weight over substantially the entire circumference, and the weight. A sixth feature is that it includes a second elastic member and a third elastic member respectively coupling one end surface and the other end surface of the weight to the inner surface of the damper case.

Furthermore, in addition to the sixth feature of the present invention, a friction reducing member that is located on the side opposite to the weight and abuts the inner surface of the damper case is attached to the second and third elastic members. The seventh feature is that the second and third elastic members are arranged in a compressed state between the friction reducing member and the weight in the damper case.

In addition to the seventh characteristic, the present invention has an eighth characteristic that the friction reducing member is interposed between the weight guide portion and the damper case.

In addition to the sixth to eighth features of the present invention, the pair of weight guide portions projecting from the inner surfaces of the damper case facing each other may have the second and third elastic members. The ninth feature is that they are arranged opposite to each other with sandwiching therebetween.

In addition to the seventh or eighth characteristic, the present invention has a tenth characteristic that the friction reducing member is formed of a synthetic resin material.

An eleventh feature of the present invention is a headrest including a dynamic damper having any one of the third to tenth features, wherein the damper case is held by a frame or a cushion member of the headrest.

The present invention is also a vehicle seat including a dynamic damper having any one of the third to tenth features, wherein the damper case is held by at least one of a frame and a cushion member of a seat back and a seat cushion. The twelfth feature is to be performed.

According to the first feature of the present invention, in the dynamic damper, the movement restricting means for restricting the movement of the weight in the predetermined direction is provided, so that the movement of the weight in the predetermined direction is restricted and the weight is moved in the predetermined direction. The unnecessary movement of the weight of can be suppressed. As a result, the dynamic damper can efficiently exert the damping effect on the vibration in the specific direction, which is supposed to be damped, and facilitates the optimization (tuning) of the damping mode according to the vibration mode of the damping target. ..

Further, according to the second feature, since the movement restricting means is configured by the weight guide portion that slidably guides the movement of the weight in a specific direction different from the predetermined direction, the weight is slid in the specific direction. Since the weight guide part for the dynamic guide serves also as the movement restricting means, the structure can be simplified and the cost can be reduced accordingly.

Further, according to the third feature, the damper case accommodating the weight and the elastic member is provided, and the weight guide portion is disposed in the damper case at a position avoiding the elastic member, so that the elastic member is smooth. It is possible to install the weight guide portion in the damper case without disturbing the elastic deformation.

According to the fourth feature, since the weight guide portion is provided so as to project from the inner surface of the damper case, the weight guide portion (and thus the movement restricting means) can be easily formed by utilizing the inner wall of the damper case. ..

Further, according to the fifth feature, at least a pair of weight guide portions are provided so as to project from the inner surfaces of the damper case that face each other, so that the pair of weight guide portions that face each other restrict movement of the weight. The sliding guide can be performed stably and accurately.

According to the sixth feature, the elastic member covers the outer surface of the weight over the entire circumference thereof, and the second elastic member covers the one end surface and the other end surface of the weight respectively. Since it is divided into members, the form of each elastic member can be simplified as much as possible and the moldability of the elastic member is better than in the case where the weight is covered with a single elastic member. In addition, the first elastic member and the second and third elastic members are made of different elastic materials, so that the first elastic member, the second and third elastic members correspond to the vibration direction to be damped. The material selection with the elastic member, the hardness setting, the thickness setting, etc. can be optimally performed.

According to the seventh feature, the second and third elastic members are provided with a friction reducing member located on the side opposite to the weight and contacting the inner surface of the damper case. Is disposed in a compressed state between the friction reducing member and the weight in the damper case, so that the second and third elastic members can impart sufficient hardness to the second and third elastic members as a damper spring and reduce the friction. Since it can be easily fixed to the inner surface of the damper case through the member without rattling, the workability of assembling the dynamic damper is improved.

Further, according to the eighth feature, since the friction reducing member is interposed between the weight guide portion and the damper case, the dead space between the weight guide portion (and thus the movement restricting means) and the damper case is provided. The friction reducing member can be effectively used to deploy the friction reducing member without difficulty, and thus the structure can be simplified and downsized.

Further, according to the ninth feature, since the pair of weight guide portions projectingly provided on the inner surfaces of the damper case facing each other are arranged to face each other with at least a part of the elastic member interposed therebetween, the elasticity of the part By utilizing the space inside the damper case existing on both sides of the member, the pair of weight guide portions can be installed without difficulty.

Further, according to the tenth feature, since the friction reducing member is made of a synthetic resin material, it is possible to easily form the friction reducing member in a desired form.

According to the eleventh feature, the effect of the first feature can be exerted on the headrest.

According to the twelfth feature, the effect of the first feature can be exerted on the vehicle seat.

The side view of the vehicle seat device which concerns on 1st Embodiment of this invention. An enlarged main-portion cross-sectional view of an arrow view portion (around the headrest) of FIG. Sectional view taken along line 3-3 of FIG. 4-4 enlarged sectional view of FIG. Perspective view showing the internal structure of the headrest Exploded perspective view of the dynamic damper inside the headrest Front view showing a modification of the corner confirmation means (first elastic member) FIG. 3 is a perspective view showing a modified example of the combined structure of the weight and the first elastic member. It is the top view which looked at the combination structure of an elastic member and a weight from the upper part, (a) shows an embodiment and (b)-(d) shows a modification. It is a development view showing the development mode before winding the 1st elastic member around a weight, (a) shows an embodiment and (b) shows a modification. FIG. 3 is a sectional view corresponding to FIG. 3, which schematically shows first to third modified examples of a combined structure of an elastic member, a damper case, a weight, and a weight guide portion. Sectional drawing corresponding to FIG. 3 schematically showing fourth to sixth modified examples of a combined structure of an elastic member, a damper case, a weight and a weight guide portion. A cross-sectional view corresponding to FIG. 3, which schematically illustrates a seventh modified example of the combined structure of the elastic member, the damper case, the weight, and the weight guide portion. The perspective view which shows the internal structure of the headrest which shows 2nd Embodiment of this invention. The perspective view which shows the internal structure of the vehicle seat which shows 3rd Embodiment of this invention. The perspective view which shows the internal structure of the vehicle seat which shows 4th Embodiment of this invention. The perspective view which shows the internal structure of the vehicle seat which shows 5th Embodiment of this invention. Sectional drawing corresponding to FIG. 3 which shows 6th Embodiment of this invention. Sectional drawing corresponding to FIG. 3 which shows 7th Embodiment of this invention.

First, the first embodiment of the present invention shown in FIGS. 1 to 13 will be described. In the following description, front and rear and left and right refer to an automobile as a vehicle to which the present invention is applied.

In FIG. 1, a vehicle seat 1 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 supporting legs 7 and 7 formed on a lower portion thereof, and the supporting legs 7 and 7 are fixed to a floor F of an automobile. A conventionally well-known position adjusting mechanism capable of adjusting the front and rear positions of the support legs 7 and 7 may be interposed between the support legs 7 and 7 and the floor F.

A pair of left and right brackets 8 projecting upward are continuously provided at a rear end portion of the seat cushion frame 6, and a seatback frame 10 of the seatback 3 is connected to the brackets 8 via a pivot 9 so as to be reclining. ..

A pair of left and right support cylinders 11 and 11 are fixedly provided on the upper end of the seatback frame 10, and the headrest 4 is supported by the 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 includes a headrest frame 12, a urethane foam cushion member 13 supported by the headrest frame 12, and a skin 14 covering the surface of the headrest frame 12. The dynamic damper D is attached to the frame 12.

The headrest frame 12 is formed by bending a pipe material, and has a pair of left and right main frame members 12a, 12a supported by the pair of support cylinders 11, 11 and front ends of the main frame members 12a, 12a. The bent upper bone members 12b, 12b, the pair of left and right front vertical bone members 12c, 12c bent and extended downward from the front ends of these upper bone members 12b, 12b, and the lower end portions of these front vertical bone members 12c, 12c. The front cross members 12d are integrally connected to each other, and the left and right front vertical members 12c, 12c are welded with bridging reinforcing crossbars 19 having a smaller diameter than the pipe material.

Thus, the cushion member 13 is formed so as to cover the headrest frame 12 from the upper part of the main frame members 12a, 12a to the front transverse frame member 12d, and the cushion member 13 is covered with the skin 14. Before forming the cushion member 13, the dynamic damper D is attached using the front longitudinal members 12c, 12c and the front transverse member 12d.

The dynamic damper D includes a weight 15, a first elastic member S1 that covers the outer surface between the upper and lower end surfaces and the other end surface of the weight 15 over the entire circumference, and upper and lower one end surfaces and the other end surface of the weight 15. And second and third elastic members S2 and S3 respectively covering the above, and a damper case 17 accommodating the weight 15 and the elastic members S1 to S3. Then, as will be described later, the weight 15 is elastically supported by the damper case 17 via the second and third elastic members S2 and S3 so as to be able to vibrate.

The weight 15 is made of metal (for example, cast iron), and is formed in a substantially rectangular parallelepiped shape that is flat in the front and rear direction in the illustrated example.

The first elastic member S1 is formed in a rectangular sheet shape, and is fixed (eg, adhered) to the side surface of the weight 15 while being wound around the outer surface of the weight 15 over the entire circumference. Then, with the first elastic member S1 set in the damper case 17 together with the weight 15, slight gaps 91 and 92 are set between the front and rear side wall inner surfaces and the left and right side wall inner surfaces of the damper case 17. .. Thus, when the weight 15 vibrates in the front-rear direction and the left-right direction, the front-rear side surface and the left-right side surface of the first elastic member S contact the inner surface of the damper case 17 so as to fill the gaps 91 and 92. The impact at this time is absorbed and relaxed by the elastic deformation of the first elastic member S.

It should be noted that the first elastic member S1 is set in the damper case 17 together with the weight 15 so that the gaps 91 and 92 do not occur (that is, the inner surface of the damper case 17 is in an uncompressed state or a slightly compressed state). It may be arranged so as to abut.

Further, the upper end portion and the lower end portion of the first elastic member S1 have an end portion shape C (that is, a portion of the weight 15 that exposes the upper end portion and the lower end portion including the upper and lower left and right corner portions E of the weight 15 in a strip shape. The upper end and the lower end are respectively recessed toward the center of the upper and lower sides, in other words, the size is smaller than the weight 15 in the vertical direction).

Thus, the end portion shape C constitutes a corner portion confirmation means for confirming at least a corner portion E of the weight 15. In this case, the corner portion E of the weight 15 includes the upper and lower end surfaces of the weight 15 and the first and second side surfaces (that is, the front side surface and the left and right side surfaces) that are respectively continuous with the end surfaces and are adjacent to each other. It refers to a corner formed by a set (in other words, a set of three surfaces of the weight 15).

FIG. 7 shows a modification of the corner confirmation means. For example, (a) shows the first corner so that only one corner of the plurality of corners E of the weight 15 is exposed. The corner confirmation means is composed of a notch C′ formed by notching a part (corner portion) of the elastic member S1. Further, in (b), the first elastic member S1 has an end portion shape C that exposes only one end portion of the weight 15 on the upper and lower sides in a strip shape, as in the above-described embodiment. Is used as the corner confirmation means.

Although not shown, the first elastic member S1 may be formed of a transparent synthetic resin material to serve as the corner confirmation means. Further, in (c), in addition to the modified example of (a), a cutout portion 80 for exposing the end portion of the weight 15 in the widthwise (ie, left-right direction) intermediate portion is further provided at the upper and lower end portions of the first elastic member S1. What is formed is shown.

Further, since the weight 15 is formed in a substantially rectangular parallelepiped shape as described above, since the weight 15 is formed in a polygonal shape in a horizontal cross section (more specifically, a horizontal cross section), the first elastic member S1 is It has a bent portion S1c corresponding to the corner of the outer side surface of 15. Further, the bending portion S1c is provided with a bending facilitating means for facilitating the bending as compared with a portion of the first elastic member S1 other than the portion other than the bending portion S1c.

In the present embodiment, the bending facilitating means is provided in a part of the first elastic member S1 corresponding to the corner of the outer surface of the weight 15, that is, the corner portion, as shown in FIGS. 4, 6 and 10A. The thin portion 81 is formed. Further, as shown in FIG. 10( b ), a plurality of perforated holes are formed in a part of the first elastic member at intervals (that is, in a perforated shape along the bent portion S 1 c) corresponding to the corners of the weight 15. The small holes 82 may constitute a foldable means.

Each of the elastic members S1 to S3 is preferably made of a sheet-shaped elastic material that is softer than the cushion member 13. Further, in the embodiment, the first elastic member S1 and the second and third elastic members S2, S3 are made of different elastic materials, for example, urethane foam molded to a desired wall thickness, and have a foaming ratio (hence, elasticity). It is composed of elastic materials having different forces.

The second and third elastic members S2, S3 are set to be thicker and have higher hardness than the first elastic member S1 when set in the damper case 17. In order to impart sufficient hardness to the second and third elastic members S2 and S3, the second and third elastic members S2 and S3 are attached to the inner surfaces of the upper and lower side walls of the damper case 17 and the weight in the set state. It is placed in a compressed state between the upper and lower end surfaces of 15.

The first elastic member S1 and the second and third elastic members S2, S3 may be made of different elastic materials (for example, urethane foam material and rubber material) or the same elastic material. You may. Further, it is desirable that the second and third elastic members S2 and S3 are made of an elastic material having a higher hardness than the first elastic member S1 even in the free state thereof.

The second and third elastic members S2, S3 are formed in a rectangular sheet shape smaller than the cross-sectional shape of the weight 15, and are bonded (adhered, for example) to the upper and lower end surfaces and the other end surface of the weight 15, respectively. .. A rectangular flat plate-shaped friction reducing member 70 that is located on the side opposite to the weight 15 and contacts the upper and lower sidewall inner surfaces of the damper case 17 is joined (adhered) to the second and third elastic members S2 and S3. The second and third elastic members S2, S3 are compressed between the friction reducing member 70 fixed by pressure and fixed to the inner surfaces of the upper and lower side walls of the damper case 17 and the end surface of the weight 15 in a compressed state. It is installed.

As described above, the outer ends of the second and third elastic members S2 and S3 are not directly fixed to the inner surfaces of the upper and lower side walls of the damper case 17 but are pressed and fixed via the friction reducing member 70. The three elastic members S2 and S3 can be easily pressure-contacted and fixed to the inner surface of the damper case 17 through the friction reducing member 70 without play. When the fixing work is performed, the friction reducing member 70 smoothly slides on the inner surface of the damper case 17, so that the workability is excellent and the workability of assembling the dynamic damper is improved.

Further, the friction reducing member 70 of the present embodiment is formed of a synthetic resin material having a low surface friction coefficient, which makes it possible to easily form the friction reducing member 70 in a desired shape. The friction reducing member 70 may be made of another material having a low surface friction coefficient, for example, a metal plate having a polished surface.

The friction reducing member 70 may be omitted and the second and third elastic members S2, S3 may be directly coupled (eg, bonded) to the inner surfaces of the upper and lower side walls of the damper case 17.

Further, FIG. 8 shows a modified example of the weight 15. For example, in (a), the weight 15 is formed in a cylindrical shape, in (b), it is formed in the shape of a quadrangular pyramid that tapers upward, and in (c), the shape of a quadrangular pyramid that tapers downward. The shape formed in (d) is shown in the shape of a truncated cone, and the shape formed in (e) is shown in the shape of an inverted cone. The expanded shape of the sheet-shaped first elastic member S1 is appropriately set so that the weight 15 is wound around the outer surface of the modified example without slack over the entire circumference.

Further, FIG. 9 shows a modification of the second and third elastic members S2, S3. That is, in contrast to the present embodiment shown in (a), in (b), the second and third elastic members S2, S3 are stacked in the lateral direction (specifically, the front-back direction) of the weight 15 in a plan view. It is shown that the weight is formed longer than the weight 15, and (c) shows the second and third elastic members S2 and S3 in the longitudinal direction (specifically, the left-right direction) of the weight 15 in a plan view. It is shown that it is formed longer than 15, and in FIG. 8D, the second and third elastic members S2 and S3 are formed shorter than the weight 15 in both vertical and horizontal directions (specifically, in the front-back and left-right directions) in plan view. What you have done is shown.

The weight 15 covered with the sheet-shaped first to third elastic members S1 to S3 as described above is housed in the front and rear half-split damper case 17. Therefore, the weight 15 is elastically supported by the damper case 17 so as to be able to vibrate mainly through the second and third elastic members S2 and S3.

As shown in FIGS. 2 to 6, 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. The weight 15 has a flat surface or a curved surface close to the front surface 15f, and the rear wall 17r has a flat surface or a curved surface close to the rear surface 15r of the weight 15.

This damper case 17 is divided into a front side first case half body 17A and a rear side second case half body 17B, and each case half body 17A, 17B is molded of synthetic resin. A rectangular fitting groove 20 and a fitting projection wall 21 that can be fitted to each other are formed on one and the other of the facing surfaces of the case halves 17A and 17B, respectively, and at the tip of the fitting projection wall 21. Are formed with a plurality of connecting claws 22, 22... Protruding outward, and a plurality of connecting holes 23, 23. Is formed.

The first and second elastic support portions 24A and 24B are integrally formed on both left and right side walls of the second case half body 17B. The first and second elastic support portions 24A and 24B are respectively provided at plate-shaped arms 25a and 25b protruding outward from the left and right side walls of the second case half body 17B and the tips of the arms 25a and 25b. The front vertical frame members 12c, 12c are configured to have superior arcuate gripping claws 26a, 26b which can be snap-engaged so as to grip them. That is, the superior arcuate gripping claws 26a and 26b can elastically grip the front vertical bone members 12c and 12c over the respective half circumferences. The arcuate gripping claws 26a, 26b have their respective openings 27a, 27b directed rearward so as to engage with the front longitudinal members 12c, 12c from the front. Therefore, the rearward load from the head of the occupant acts in the direction in which the grip 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 disengagement of the claws 26a and 26b can be prevented. Further, by selecting the lengths of the arms 25a and 25b, the center-to-center distance between the two gripping claws 26a and 26b is made to match the center-to-center distance between the two front vertical bone members 12c and 12c. The engagement with 12c and 12c can be performed accurately.

The arcuate gripping claws 26a and 26b are formed such that their inner diameters D1 and D2 are different from each other. In the illustrated example, the inner diameter D2 of the grip claw 26b of the second elastic support portion 24B is set to be larger than the inner diameter D1 of the grip claw 26a of the first elastic support portion 24A. The superior arcuate gripping claws 26a and 26b are formed so that their rigidity is different from each other. In the illustrated example, a notch is formed at the tip of the grip claw 26a of the first elastic support portion 24A so that the rigidity of the grip claw 26a of the first elastic support portion 24A is lower than that of the grip claw 26b of the second elastic support portion 24B. 28 is provided, or the thickness of the grip claw 26a is set thinner than that of the grip claw 26b. 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 therebetween.

A window hole 29 is provided in each of the gripping claws 26a and 26b, and the engagement state between the gripping claws 26a and 26b and the front longitudinal bone members 12c and 12c can be visually confirmed through the window hole 29. ing.

On the other hand, the positioning support portion 30 is integrally formed on the lower side wall of the first case half body 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 half 17A and the lower end of the arm 30a so as to abut and engage with the front transverse member 12d. A U-shaped contact claw 30b to be obtained, and the contact claw 30b abuts and engages the front transverse member 12d from the rear side, whereby the grip claws 26a and 26b and the left and right front longitudinal members are formed. The engagement position with 12c, 12c is defined. In this way, the mounting 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 thickened portion 31 that strengthens the rigidity of the roots is formed, and further, the first and second elastic support portions 24A. , 24B contact the arms 25a, 25b to bend them forward, that is, a pair of stoppers 32, 32 for restricting the bending of the arms 25a, 25b to the side opposite to the openings 27a, 27b of the gripping claws 26a, 26b. It is formed on both left and right side walls of the first case half body 17A. Each stopper 32 has a central wall portion 32a that linearly abuts against the back surface of the corresponding gripping claw 26a, 26b, and the arms 25a, 25b connected to both side ends of the central wall portion 32a to gripping claws 26a, 26b. The pair of side wall portions 32b, 32b that come into contact with the curved surface extending over the back surface of the above-mentioned No. 1 is configured to have a U-shaped cross section. The stopper 32 having such a structure has high rigidity and can secure a wide contact area with the back surface extending 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. The bending of 25a and 25b can be controlled effectively. Therefore, even if a large rearward load is applied to the damper case 17 from the head of the occupant, the stoppers 32, 32 come into contact with the front surfaces of the arms 25a, 25b to restrict the forward bending of the arms 25a, 25b. Therefore, 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. In addition, the arm portion 30a of the positioning support portion 30 is provided with a plurality of reinforcing ribs 33 that connect the lower side wall of the first case half body 17A and the contact claw 30b.

By the way, the dynamic damper D includes a movement restricting unit WG that restricts the movement of the weight 15 in a predetermined direction (the vertical direction in the illustrated example). In the present embodiment, the movement restricting means WG is composed of a weight guide portion WG that slidably guides the movement of the weight 15 in a specific direction (front-back direction, left-right direction in the illustrated example) different from the predetermined direction. It

More specifically, the upper and lower portions of the inner surfaces of the left and right side wall portions of the first and second case halves 17A and 18B, which are separate parts of the damper case 17, project toward each other and extend in the front-rear direction. A pair of protruding left and right protruding weight guide portions WG are integrally projected. Then, the pair of weight guide portions WG at the bottom of the first and second case halves 17A, 18B slidably contact the lower end portion of the weight 15 in the front-rear direction and the pair of weight guide portions at the top. Since the WG slidably contacts the upper end of the weight 15 in the front-rear and left-right directions, the vertical relative movement of the weight 15 with respect to the damper case 17 is restricted.

The upper and lower weight guide portions WG are in contact with the inner surfaces of the corresponding upper and lower friction reducing members 70 on the weight 15 side, and support the friction reducing members 70 from the weight 15 side. Although not shown, a modification in which a slight vertical gap is set between the weight guide portion WG and the friction reducing member 70 can also be implemented.

Further, as another modified example of the damper case 17, although not shown, a pair of left and right protrusions is formed only on the inner surface of the left and right side walls of one of the first and second case halves 17A and 18B. The weight-like weight guide portion WG may be provided so as to project.

The upper and lower weight guide portions WG are arranged at positions avoiding the elastic members S1 to S3. Moreover, the pair of left and right upper and lower weight guide portions WG are arranged to face each other with the second elastic member S2 and the third elastic member S3 sandwiched therebetween. Accordingly, the left and right weight guide portions WG facing each other can stably and accurately perform the movement regulation and the sliding guide of the weight 15.

Further, the friction reducing member 70 joined to the outer end surfaces of the second and third elastic members S2, S3 (the end surfaces on the side opposite to the weight 15) includes the upper and lower weight guide portions WG and the upper and lower portions of the damper case 17. It is inserted between each of the inner end faces. As a result, the friction reducing member 70 can be comfortably arranged by effectively utilizing the dead space between the weight guide portion WG (hence the movement restricting means) and the damper case 17, and the structure can be simplified and downsized. .. Further, the friction reducing member 70 is stably and firmly sandwiched between the weight guide portion WG and the inner surfaces of the upper and lower side walls of the damper case 17 at a fixed position.

Further, the longitudinal length of the weight guide portion WG in a front view (see FIG. 3) is formed to be substantially equal to or longer than the length of the shortest side of the weight 15 (that is, the dimension in the front-rear direction). Thereby, the effective length of the weight guide portion WG can be sufficiently ensured, and the weight 15 can be stably supported by the weight guide portion WG.

11 to 13 show modified examples of the weight guide portion WG forming the movement restricting means for the weight 15. For example, in the first modified example shown in (a), a pair of upper and lower weight guide portions WG are provided on the inner surfaces of the upper and lower side walls of the damper case 17 (that is, one or both of the first and second case halves 1A). The second and third elastic members S2, S3 are provided so as to be protruded, and the upper and lower end surfaces of the weight 15 are brought into contact with the weight guide portions WG so as to be slidable forward, backward, leftward and rightward. As a result, the vertical movement of the weight 15 is restricted.

Further, in the second modified example shown in (b), the first elastic member S1 wound around and fixed to the outer surface of the weight 15 is divided into upper and lower parts, and then the pair of upper and lower weight guide parts WG are provided. Upper and lower end surfaces and left and right side surfaces of the weight 15 are slidably brought into contact with each other. As a result, the movement of the weight 15 in the vertical and horizontal directions is restricted.

Further, the third modified example shown in (c) is one in which the upper and lower first elastic members S1 in the second modified example of (b) are omitted.

Further, in the fourth modified example shown in (d), the pair of upper and lower weight guide parts WG in the third modified example of (c) are omitted, and the left and right side surfaces of the weight are moved forward and backward by the pair of left and right weight guide parts WG. And slidably in contact with each other. As a result, the lateral movement of the weight 15 is restricted.

Further, in the fifth modified example shown in (e), the first elastic member S1 is wound around and fixed to the weight 15 around the horizontal axis in the left-right direction, while the damper case 17 (that is, the first and second case halves 1A) is fixed. One or both of the left and right side wall inner surfaces are provided with a pair of left and right weight guide portions WG so as to project so as to avoid the second and third elastic members S2, S3, and the weight guide portions WG receive the weight 15 The left and right side faces of the are slidably brought forward and backward and vertically. As a result, the lateral movement of the weight 15 is restricted.

Further, in the sixth modified example shown in (f), the disposition of the weight 15 and the elastic members S1 to S3 of the embodiment shown in FIGS. 1 to 6 is angularly displaced by 90 degrees around the front-rear center line of the dynamic damper D. Equivalent to a thing. In this case, the movement of the weight 15 in the left-right direction is restricted by the weight guide portion WG, that is, the weight 15 is supported by the weight guide portion WG so as to be slidable up and down and front and back. As a result, the lateral movement of the weight 15 is restricted.

In the seventh modified example shown in (g), the weight guide portion WG extends in the front-rear direction on the front and rear side wall inner surfaces of the damper case 17 (that is, one or both of the first and second case halves 1A). It is composed of a support pin protruding from. That is, the upper and lower intermediate portions of the weight 15 are fitted to and supported by the support pin WG so as to be slidable back and forth without play, and the support pin WG restricts the vertical and horizontal movement of the weight 15.

11 to 13, the friction reducing member 70 is omitted except for the sixth modification (f), and the second and third elastic members S2 and S3 are the inner surface of the damper case 17. However, even in each of the modified examples other than the sixth modified example, even if the second and third elastic members S2 and S3 are pressed against and fixed to the inner surface of the damper case 17 via the friction reducing member 70. Good.

Next, the operation of the first embodiment will be described.

In the assembly procedure of the dynamic damper D, first, the first elastic member S1 is wound around and fixed (for example, adhered) to the outer surface between the upper and lower one end surfaces and the other end surface of the weight 15, and the upper and lower one end surfaces of the weight 15 and The second and third elastic members S2, S3 are joined (adhered, for example) to the other end surface, and the assembly of the weight and the elastic member is assembled into a small assembly. Then, the damper case 17 is assembled by sandwiching the assembly between the facing surfaces of the first and second case halves 17A and 17B and detachably connecting the mating surfaces of the case halves 17A and 17B. ..

In this case, the second and third elastic members S2 and S3 are vertically compressed and deformed, and the damper case 17 (first and second case halves 17A and 17B) is vertically moved through the friction reducing member 70. It is press-fitted and fitted to the inner surface of the side wall, while the front and rear side surfaces and the left and right side surfaces of the first elastic member S1 are respectively attached to the front and rear side wall surfaces and the left and right side wall inner surfaces of the damper case 17 (first and second case halves 17A and 17B). Face each other with the gaps 91 and 92 interposed therebetween.

The dynamic damper D thus assembled is set together with the outer skin 14 in the cavity of a mold (not shown) for injection-molding the cushion member 13 of the headrest 4, and the cushion member 13 is injection-molded in the set state. At the same time, the dynamic damper D is integrally embedded at a predetermined position in the cushion member 13.

When the vibration of the automobile is transmitted from the floor F to the seat back 3 and the headrest 4 through the seat cushion 2 and the pivot 9 during traveling of the automobile, the weight 15 in the dynamic damper D mainly includes the second and third elastic members S2 and S3. The seat back 3 and the headrest 4 can be damped by resonating with the elastic deformation of and absorbing the vibration energy of the seat back 3 and the headrest 4 instead.

In such a dynamic damper D, since the weight 15 is formed in a polyhedron (substantially rectangular parallelepiped shape), and the weight 15 is covered and supported by the sheet-like elastic members S1 to S3 formed in advance to a desired thickness, An elastic member having a desired thickness can be extremely easily formed on the outer surface of the weight 15, and the dynamic damper D having stable vibration damping characteristics can be provided at low cost.

Further, in the dynamic damper D of the embodiment, since the weight guide portion WG is provided as the movement restricting means for restricting the movement of the weight 15 in the predetermined direction (for example, the vertical direction), the movement of the weight 15 in the predetermined direction is performed. Is restricted, and unnecessary movement of the weight in the predetermined direction is suppressed. As a result, the dynamic damper D can efficiently exhibit the vibration damping effect on the vibration in the specific direction (for example, the front-rear, left-right direction) that should be damped, and the optimization of the vibration damping mode according to the vibration mode of the vibration damping target. (Tuning) becomes easy.

Further, the weight 15 can move (and thus vibrate) back and forth and left and right even if the vertical movement of the weight 15 is restricted, and at that time, the second and third elastic members S2 and S3 having a relatively high hardness. Since it vibrates in a stable state in the front-rear and left-right directions due to the elastic deformation of the dynamic damper D, the dynamic damper D can effectively exert a damping effect on the front-rear and left-right direction vibrations.

In addition, in the present embodiment, the weight guide portion WG that slides and guides the weight 15 in the specific direction also serves as the movement restricting means, which simplifies the structure and thus reduces the cost.

In addition, the first elastic member S1 of the present embodiment has a slight gap 91, 92 between the front and rear side wall inner surfaces and the left and right side wall inner surfaces of the damper case 17 when the first elastic member S1 is set in the damper case 17 together with the weight 15. Is set. Then, when the weight 15 vibrates back and forth or left and right as described above, the front and rear side surfaces or the left and right side surfaces of the first elastic member S collide with the inner surface of the damper case 17 so as to fill the gaps 91 and 92. However, the impact at that time is absorbed and relaxed by the elastic deformation of the first elastic member S.

On the other hand, if the first elastic member S1 is omitted, the weight 15 may directly collide with the inner surface of the damper case 17 when the weight 15 vibrates back and forth, and left and right, but an unpleasant collision sound may occur. In the present embodiment, the generation of unpleasant collision noise can be effectively prevented by the buffering effect of the first elastic member S1.

The first elastic member S is elastically compressed when the weight 15 still vibrates in the front-rear direction or the left-right direction after the front and rear side surfaces and the left and right side surfaces contact the inner surface of the damper case 17 as described above. The weight 15 can be deformed and an elastic resistance can be applied to the weight 15.

Further, in the present embodiment, among the corner portions E where at least one upper and lower end surface of the weight 15 and the first and second side surfaces (front side surface, left and right side surface) that are respectively continuous with the one end surface and are adjacent to each other are gathered. At least a part of the corner E is visible when the weight 15 is assembled in the damper case 17. As a result, when the weight 15 is assembled, the weight corner E can be directly and easily aligned with the inner surface of the damper case 15, so that the weight 15 is inserted into the damper case 17. Assembly workability, and consequently assembly workability of the dynamic damper D is improved. Moreover, by confirming the corner portion E of the weight 15 before the weight 15 is assembled into the damper case 17, it is possible to easily perform the prior confirmation of the attachment state of the first elastic member S1 to the weight end E. Therefore, the assembling workability is further enhanced.

In addition, in the present embodiment, the elastic members S1 to S3 that cover the weight 15 respectively include the first elastic member S1 that covers the outer surface of the weight 15 over the entire circumference and one end surface and the other end surface of the weight 15, respectively. It is divided into a second elastic member S2 and a third elastic member S3 to be covered. As a result, the form of each of the elastic members S1 to S3 can be simplified as much as possible and the formability is better than in the case where the weight 15 is covered with a single sheet-like elastic member. Moreover, since the materials and thicknesses of the first elastic member S1 and the elastic materials forming the second and third elastic members S2 and S3 can be easily changed, the first elastic member S1 can be easily changed in accordance with the vibration damping target, the installation site, and the posture. The elastic member S1 and the second and third elastic members S2 and S3 can each be selected in terms of material, hardness, thickness, etc., of the elastic members S1 to S3 so as to exert the optimum dynamic damper effect.

14 shows a second embodiment, in which the dynamic damper D 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 with the left and right upper bone members 12b and 12b from above, and the positioning support portion 30 is attached to the left and right upper bone members 12b and 12b. A cross member 46 connecting the rear end portions is abutted and engaged from below. Since other configurations are the same as those in the first embodiment, in FIG. 10, parts corresponding to those in the first embodiment are designated by the same reference numerals, and overlapping description will be omitted.

According to the second embodiment, the space between the left and right upper bone members 12b, 12b is effectively used for the installation of the dynamic damper D, so that in the cushion member 13 of the headrest 4, the front portion with which the head of the occupant abuts. Of the seat cushion 2 and the headrest 4 and 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 to enhance the vibration damping function of the dynamic damper D. it can.

Further, FIG. 15 shows a third embodiment, in which the seat back 3 has a substantially right-angled triangular shape in front corners at the inner corners of the upper and left corners of the seat back frame 10. The dynamic damper D including the damper case 17 is arranged, and the pair of elastic support portions 24A and 24B formed on the upper surface and one side surface of the damper case 17 are provided on the vertical frame member 10a and the horizontal frame member 10b of the seatback frame 10. Each is snap-engaged. 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 the third embodiment, the vibration of the seat back 3 can be effectively suppressed by the action of the dynamic damper D arranged on the uppermost part of the seat back frame 10. Moreover, the dead space at the inner corner of the upper corner of the seatback frame 10 can be effectively used for installing the dynamic damper D. The dynamic damper D may be provided only at the inner corner of either the left or right corner of the upper portion of the seatback frame 10.

In addition, FIG. 16 shows a fourth embodiment, in which the left and right vertical bone members 10a of the seatback frame 10 are integrally connected to each other at the central portions of the corrugated bone members 49 that integrally connect the upper portions thereof. A pair of elastic support portions 24A, 24B formed on both left and right side surfaces of the damper case 17 are snap-engaged with the pair of inclined bone portions 49a, 49a inclined in opposite directions, respectively. At that time, the pair of elastic support portions 24A, 24B are obliquely arranged corresponding to the pair of inclined bone portions 49a, 49a, and thus the pair of elastic support portions 24A, 24B are arranged in the pair of inclined bone portions 49a, 49a. Up and down movement is prevented. The basic structure of the dynamic damper D is the same as that of the first embodiment. In this way, the vibration of the seat back 3 can be effectively performed by the action of the single dynamic damper D attached to the upper part and the central part of the seat back frame 10.

Further, FIG. 17 shows a fifth embodiment, in which a front reinforcing plate 6a which is welded to the front portion of the seat cushion frame 6 and extends in the left-right direction for damping the seat cushion 2. The damper case 17 of the dynamic damper D is attached to the. In this case, the damper case 17 has a pair of elastic support portions 50, 50 formed on the upper surface thereof. Each elastic support portion 50 is composed of a shaft portion 50a protruding from the outer side surface of the damper case 17, and an arrowhead-shaped locking protrusion 50b formed at the tip of the shaft portion 50a. A slit 50c is provided from the tip of the locking projection 50b to the shaft portion 50a so that the diameter can be reduced. An elastic collar 52 made of rubber 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 supporting parts 50, 50, and the elastic supporting parts 50, 50 are provided in the locking holes 51, 51. By pushing in the locking projections 50b from below, the locking projections 50b do not elastically contract in diameter, but after passing through the corresponding locking holes 51, they expand to the original shape, that is, snap-engage and lock. Detachment from the hole 51 is prevented. At this 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 rattle on the front surface of the front reinforcing plate 6a. Retained without. Except for the elastic supporting portions 50, 50, the damper case 17, the weight 15 housed therein, and the sheet-like elastic members S1 to S3 covering the same are basically the same as those in the first embodiment. Therefore, in FIG. 17, the portions corresponding to those in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

According to the fifth embodiment, the action of the dynamic damper D arranged at the front end portion of the seat cushion frame 6 can effectively suppress the vibration of the seat cushion 2. 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 easily moved to the front reinforcing plate 6a by a simple pushing operation. The locking holes 51, 51 can be snap-engaged, and the damper case 17 can be easily attached.

In addition, FIG. 18 shows a sixth embodiment, in which the damper case 17 is not provided with an elastic supporting portion, and the damper case 17 is provided with a cushion member 13 which is harder than the sheet-like elastic members S1 to S3. Since it is embedded and held in other parts, and other configurations are the same as those of the first embodiment, in FIG. 18, parts corresponding to those of the first embodiment are designated by the same reference numerals, and a duplicate description will be given. Omit it.

According to the sixth embodiment, since the damper case 17 is not provided with the elastic support portion, the structure of the dynamic damper D can be simplified. When the damper case 17 is embedded in the cushion member 13 made of foam material, the damper case 17 is hung on the headrest frame 12 with a thread and held at a predetermined position, and after the cushion member 13 is molded, the thread is cut. become.

Further, FIG. 19 shows a seventh embodiment. In each of the above-described embodiments, the weight 15 and the weight guide portion WG are brought into contact with each other in the vertical direction and are engaged with each other (that is, are directly brought into contact with each other so as to be slidable in the front-rear direction and the left-right direction). In the configuration, a slight gap 93 is set in the vertical direction between the weight 15 and the weight guide portion WG, and the weight 15 can be slightly displaced vertically with respect to the damper case 17 within the range of the gap 93. ing.

Since the other configurations of the seventh embodiment are the same as those of the first embodiment, each component is given the same reference numeral as the corresponding component of the first embodiment, and further description is omitted. To do. Thus, also in the seventh embodiment, it is possible to achieve the same effect as that of the first embodiment.

Further, in the seventh embodiment, since a slight vertical gap 93 is set between the weight 15 and the weight guide portion WG, the weight 15 elastically deforms the second and third elastic members S2, S3. In the process of vibrating back and forth or left and right with the above, the weight 15 does not receive a sliding resistance larger than that of the weight guide portion WG due to the existence of the gap 93, and the damper characteristic of the rising of the dynamic damper D can be stabilized. it can. Further, when the weight 15 is strongly vibrated in the vertical direction as well, the weight 15 contacts the weight guide portion WG so as to close the gap 93, so that further vertical movement is restricted. It Also in this case, the movement of the weight 15 in the front-rear and left-right directions is allowed by the weight 15 slidingly contacting the weight guide portion WG in the front-rear and left-right directions.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.

For example, at least one of the third to fifth embodiments can be used in combination with the first or second embodiment.

Further, one of the first and second halves 17A and 17B forming the damper case 17 may be formed in a box shape having an opening, and the other may be formed in a lid shape closing the opening.

Further, the vehicle seat 1 according to the present invention is applicable not only to automobiles but also to railway vehicles, airplanes and the like. The seat 1 can also be installed by projecting from the wall surface of the vehicle.

In the above-described embodiment, the weight guide portion WG (movement restriction means) restricts the vertical movement of the weight 15, but the movement restriction direction can be arbitrarily set according to the vibration suppression target. For example, as shown in FIGS. 11B and 12C and FIGS. 12D to 12F, the horizontal movement of the weight 15 may be restricted, or the illustration is omitted. However, the movement of the weight 15 in the front-rear direction may be restricted.

Further, in the above-described embodiment, the elastic members S1 to S3 are formed into a sheet shape, and are attached to the weight 15 to be attached and fixed afterwards. You may do it.

Further, in the above-described embodiment, the headrest 4 which is a separate component from the seatback 3 is attached to the seatback 3 afterwards. You may implement as.

Further, in the above-described embodiment, the dynamic damper D is provided with the corner confirmation means C and C'for confirming at least a corner E of the weight 15, but in the present invention, the above-mentioned corners are provided. The confirmation means may be omitted, and the corner portion E of the weight 15 may not be confirmed.

D... Dynamic dampers S1 to S3... First to third elastic members WG as elastic members... Weight guide section 1 as movement restricting means... Vehicle seat Seats for automobiles as seats, seat cushions, seat backs, headrests, and seat cushion frames as frames Seat back frame 12 as frame 12 Headrest frame 13 as frame 13 Cushion member 15 Weights 17 Damper case 70 Friction reducing member

Claims (12)

In a dynamic damper including a weight (15) and elastic members (S1 to S3) that vibratably support the weight (15),
A dynamic damper comprising a movement restricting means (WG) for restricting the movement of the weight (15) in a predetermined direction. 2. The movement restricting means is composed of a weight guide portion (WG) slidably guiding the movement of the weight (15) in a specific direction different from the predetermined direction. Dynamic damper described in. A damper case (17) accommodating the weight (15) and the elastic members (S1 to S3);
The dynamic weight according to claim 1 or 2, wherein the weight guide portion (WG) is arranged in a position avoiding the elastic members (S1 to S3) in the damper case (17). damper. The dynamic damper according to claim 3, wherein the weight guide portion (WG) is provided on an inner surface of the damper case (17) so as to project therefrom. The dynamic damper according to claim 4, wherein at least a pair of the weight guide portions (WG) are respectively provided on the inner surfaces of the damper case (17) facing each other. The elastic member includes a first elastic member (S1) that covers an outer surface between one end surface and the other end surface of the weight (15) over substantially the entire circumference, and one end surface and the other end surface of the weight (15). The dynamic damper according to any one of claims 3 to 5, further comprising second and third elastic members (S2, S3) respectively coupled to the inner surface of the damper case (17). A friction reducing member (70) is attached to the second and third elastic members (S2, S3), which is located on the opposite side of the weight (15) and is in contact with the inner surface of the damper case (17). ,
The second and third elastic members (S2, S3) are arranged in a compressed state between the friction reducing member (70) and the weight (15) in the damper case (17). The dynamic damper according to claim 6. The dynamic damper according to claim 7, wherein the friction reducing member (70) is inserted between the weight guide portion (WG) and the damper case (17). A pair of the weight guide portions (WG) projectingly provided on the inner surfaces of the damper case (17) facing each other are arranged to face each other with the second and third elastic members (S2, S3) interposed therebetween. The dynamic damper according to any one of claims 6 to 8, characterized in that: The dynamic damper according to claim 7, wherein the friction reducing member (70) is made of a synthetic resin material. A headrest comprising the dynamic damper according to any one of claims 3 to 10, wherein the damper case (17) is held by a frame (12) or a cushion member (13) of the headrest (4). Headrest featuring. A vehicle seat comprising the dynamic damper according to any one of claims 3 to 10, wherein the damper case (17) is a frame of at least one of a seat back (3) and a seat cushion (2). (6, 10) or a cushion member (13), The vehicle seat characterized by the above-mentioned.

Images