JP5719199B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a dynamic damper that is attached to a vibration source side and attenuates vibrations on the vibration source side.

  The dynamic damper is attached to, for example, a seat back of a vehicle seat and attenuates vibration of the seat back (see Patent Document 1). The dynamic damper disclosed in Patent Document 1 includes a pair of upper and lower opposing walls, a rectangular parallelepiped mass member provided between the opposing walls, and two rubbers connecting the upper surface of the mass member and the lower surface of the upper opposing wall. An elastic body and two rubber elastic bodies that connect the lower surface of the mass member and the upper surface of the lower opposing wall, and the two upper and lower rubber elastic bodies are provided on both sides of the upper and lower surfaces of the mass member in the longitudinal direction. Is provided. These rubber elastic bodies are thinly formed in order to set the resonance frequency of the dynamic damper to a relatively low frequency.

JP 2003-226179 A

  However, since the rubber elastic body is formed thinly, the rubber elastic body is distorted by the vibration of the mass member, particularly the vibration in the longitudinal direction and the short side direction of the opposing wall. There is a risk of damage. Furthermore, if the rubber elastic body is damaged, the mass member may fall off.

  Therefore, in order to improve the durability of the rubber elastic body to prevent breakage, it is conceivable to make the rubber elastic body thicker (increase the cross-sectional area). However, if the rubber elastic body is thickened in the above layout, there is a problem that the spring constant of the rubber elastic body changes and the resonance frequency of the dynamic damper shifts.

  The present invention has been made in view of this point, and is to improve the durability of an elastic body while maintaining the resonance frequency of a dynamic damper.

A first invention is a dynamic damper that is attached to a vibration source side and attenuates vibrations on the vibration source side, and is provided between an attachment member having two opposing walls facing each other and the opposing walls. The opposing surfaces which are provided between the opposing mass walls and the opposing walls and on both sides in the longitudinal direction of the opposing walls in the mass member, and which oppose each other in the longitudinal direction of the opposing walls in the opposing walls and the mass member. An elastic body having a connecting portion for connecting the two opposing walls, each connecting portion extending in the opposing direction of the opposing walls, and a first connecting portion for connecting the opposing walls to each other; A second connection is provided between the first connecting portion and the opposing surface of the mass member so as to extend in a longitudinal direction of the opposing wall, and connects the first connecting portion and the opposing surface of the mass member to each other. And have a top A plurality of second connecting parts are provided between the first connecting part and the opposing surface of the mass member, respectively, and the plurality of second connecting parts provided on the same side in the longitudinal direction of the opposing wall are: The first connecting portions are arranged to be spaced from each other in the opposing direction of the opposing walls .

  Here, in general, by lengthening the elastic body, the elastic body can be thickened and the spring constant of the elastic body can be maintained.

  Then, according to the first aspect of the invention, the length of connecting the opposing walls of the elastic body and the mass member (hereinafter referred to as “elastic body free length”) can be made longer than before, so that the elastic body is thickened. In addition, the spring constant can be maintained. For this reason, durability of an elastic body can be improved, maintaining the resonant frequency of a dynamic damper.

  That is, the elastic body free length in the conventional dynamic damper is the length from each opposing wall to the upper and lower surfaces of the mass member. On the other hand, in the dynamic damper of the present invention, the elastic body is provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and the opposing walls and the mass member in the longitudinal direction of the opposing wall are mutually connected. Since the connecting portions that connect the opposing surfaces are provided, the elastic body free length of the dynamic damper of the present invention is at least longer than the conventional elastic body free length. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

Also, each connecting portion includes a first connecting portion for connecting the two opposing walls, provided so as to extend in the longitudinal direction of the opposing wall between said opposing surfaces of the first connecting portion and the mass member, a first coupling The elastic body free length is longer than that of the conventional elastic body free length by at least the second connecting portion. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

  In the dynamic damper of the present invention, since the elastic body is disposed on both sides of the opposing wall in the longitudinal direction of the mass member and supports the mass member from both sides in the longitudinal direction, the mass member is parallel to the opposing wall during vibration. Can be prevented from rotating around the center of gravity in a simple plane. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

  In addition, since the plurality of second connecting portions provided on the same side in the longitudinal direction of the opposing wall are arranged at intervals in the opposing direction of the opposing walls of the first connecting portion, the mass member is opposed to the opposing wall during vibration. Can be prevented from rotating around the center of gravity in a plane parallel to. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

According to a second aspect of the present invention, in the first aspect of the invention, the first connecting portion is formed such that a central portion in the extending direction protrudes to one side in the longitudinal direction of the facing wall from both ends. And

  Thereby, since the 1st connection part is formed so that the extension direction center part may protrude in the longitudinal direction one side of an opposing wall rather than both ends, a 1st connection part is straight in the longitudinal direction of an opposing wall. The free length of the elastic body can be made longer than when it is extended. Therefore, since the elastic body can be made thicker while maintaining the spring constant of the elastic body, the durability of the elastic body can be further improved while maintaining the resonance frequency of the dynamic damper.

According to a third aspect of the present invention, in the first or second aspect of the invention, the first connecting portion is formed such that a central portion in the extending direction protrudes to one side in the short direction of the facing wall from both ends. The connecting position of the first connecting portion to the facing wall is deviated from the connecting position of the second connecting portion to the facing surface of the mass member in the short direction of the facing wall. To do.

  Thereby, since the 1st connection part is formed so that the extension direction center part may protrude in the transversal direction one side of an opposing wall rather than both ends, a mass member vibrates and the said transversal direction other side When moving to the center, a force from both end portions toward the central portion in the extending direction acts, and the central portion in the extending direction is prevented from moving to the other side in the short direction. Accordingly, since the deformation in the short direction of the first connecting portion is suppressed, the rigidity of the elastic body in the short direction can be improved.

  In addition, since the free length of the elastic body can be made longer than the case where the first connecting portion extends straight in the short direction of the opposing wall, the elastic body is made thicker while maintaining the spring constant of the elastic body. Can do. Therefore, the durability of the elastic body can be further improved while maintaining the resonance frequency of the dynamic damper.

In a fourth aspect based on the first to third any one aspect of the invention, the first connecting portion, respectively provided by a plurality in the longitudinal direction on both sides of the opposing walls in the mass member, the longitudinal of said opposing walls The plurality of first connecting portions provided on the same direction side are arranged so as to be shifted from each other in the short direction of the facing wall.

  As a result, a plurality of first connecting portions are provided on both sides in the longitudinal direction of the opposing wall of the mass member, and the plurality of first connecting portions provided on the same side in the longitudinal direction of the opposing wall are mutually in the short direction of the opposing wall. Since they are displaced, the mass member can be prevented from rotating around the center of gravity in a plane parallel to the opposing wall during vibration. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

A fifth invention is a dynamic damper that is attached to a vibration source side and attenuates vibrations on the vibration source side, and is provided between an attachment member having two opposing walls facing each other and the opposing walls. The opposing surfaces which are provided between the opposing mass walls and the opposing walls and on both sides in the longitudinal direction of the opposing walls in the mass member, and which oppose each other in the longitudinal direction of the opposing walls in the opposing walls and the mass member. An elastic body having a connecting portion for connecting the two opposing walls, each connecting portion extending in the opposing direction of the opposing walls, and a first connecting portion for connecting the opposing walls to each other; A second connection is provided between the first connecting portion and the opposing surface of the mass member so as to extend in a longitudinal direction of the opposing wall, and connects the first connecting portion and the opposing surface of the mass member to each other. And have a top First connecting portion is characterized by being formed so as to protrude one longitudinal side of the opposing wall than both end portions thereof extending direction central portion.

Thereby, since the elastic body free length can be made longer than before, the elastic body can be thickened and the spring constant can be maintained. For this reason, durability of an elastic body can be improved, maintaining the resonant frequency of a dynamic damper.

That is, the elastic body free length in the conventional dynamic damper is the length from each opposing wall to the upper and lower surfaces of the mass member. On the other hand, in the dynamic damper of the present invention, the elastic body is provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and the opposing walls and the mass member in the longitudinal direction of the opposing wall are mutually connected. Since the connecting portions that connect the opposing surfaces are provided, the elastic body free length of the dynamic damper of the present invention is at least longer than the conventional elastic body free length. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

Each connecting portion is provided so as to extend in the longitudinal direction of the opposing wall between the first connecting portion that connects the opposing walls, and the first connecting portion and the opposing surface of the mass member. The elastic body free length is longer than that of the conventional elastic body free length by at least the second connecting portion. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

In the dynamic damper of the present invention, since the elastic body is disposed on both sides of the opposing wall in the longitudinal direction of the mass member and supports the mass member from both sides in the longitudinal direction, the mass member is parallel to the opposing wall during vibration. Can be prevented from rotating around the center of gravity in a simple plane. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

Further, since the first connecting portion is formed so that the central portion in the extending direction protrudes to one side in the longitudinal direction of the opposing wall from both ends, the first connecting portion extends straight in the longitudinal direction of the opposing wall. The free length of the elastic body can be made longer than in the case where it is. Therefore, since the elastic body can be made thicker while maintaining the spring constant of the elastic body, the durability of the elastic body can be further improved while maintaining the resonance frequency of the dynamic damper.

A sixth invention is a dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side, and is provided between an attachment member having two opposing walls facing each other and the opposing walls. The opposing surfaces which are provided between the opposing mass walls and the opposing walls and on both sides in the longitudinal direction of the opposing walls in the mass member, and which oppose each other in the longitudinal direction of the opposing walls in the opposing walls and the mass member. An elastic body having a connecting portion for connecting the two opposing walls, each connecting portion extending in the opposing direction of the opposing walls, and a first connecting portion for connecting the opposing walls to each other; A second connection is provided between the first connecting portion and the opposing surface of the mass member so as to extend in a longitudinal direction of the opposing wall, and connects the first connecting portion and the opposing surface of the mass member to each other. And have a top The first connecting portion is formed such that the central portion in the extending direction protrudes to one side in the short direction of the opposing wall from both ends, and the connecting position of the first connecting portion to the opposing wall is The second connecting portion is displaced from the connecting position of the mass member to the facing surface in the short direction of the wall.

Thereby, since the elastic body free length can be made longer than before, the elastic body can be thickened and the spring constant can be maintained. For this reason, durability of an elastic body can be improved, maintaining the resonant frequency of a dynamic damper.

That is, the elastic body free length in the conventional dynamic damper is the length from each opposing wall to the upper and lower surfaces of the mass member. On the other hand, in the dynamic damper of the present invention, the elastic body is provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and the opposing walls and the mass member in the longitudinal direction of the opposing wall are mutually connected. Since the connecting portions that connect the opposing surfaces are provided, the elastic body free length of the dynamic damper of the present invention is at least longer than the conventional elastic body free length. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

Each connecting portion is provided so as to extend in the longitudinal direction of the opposing wall between the first connecting portion that connects the opposing walls, and the first connecting portion and the opposing surface of the mass member. The elastic body free length is longer than that of the conventional elastic body free length by at least the second connecting portion. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

In the dynamic damper of the present invention, since the elastic body is disposed on both sides of the opposing wall in the longitudinal direction of the mass member and supports the mass member from both sides in the longitudinal direction, the mass member is parallel to the opposing wall during vibration. Can be prevented from rotating around the center of gravity in a simple plane. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

In addition, since the first connecting portion is formed so that the central portion in the extending direction protrudes to one side in the short direction of the opposing wall from both ends, the mass member vibrates to the other side in the short direction. When it moves, the force which goes to this extension direction center part from both ends acts, and this extension direction center part is prevented from moving to the said transversal direction other side. Accordingly, since the deformation in the short direction of the first connecting portion is suppressed, the rigidity of the elastic body in the short direction can be improved.

In addition, since the free length of the elastic body can be made longer than the case where the first connecting portion extends straight in the short direction of the opposing wall, the elastic body is made thicker while maintaining the spring constant of the elastic body. Can do. Therefore, the durability of the elastic body can be further improved while maintaining the resonance frequency of the dynamic damper.

A seventh invention is a dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side, and is provided between the attachment member having two opposing walls facing each other and the opposing walls. The opposing surfaces which are provided between the opposing mass walls and the opposing walls and on both sides in the longitudinal direction of the opposing walls in the mass member, and which oppose each other in the longitudinal direction of the opposing walls in the opposing walls and the mass member. An elastic body having a connecting portion for connecting the two opposing walls, each connecting portion extending in the opposing direction of the opposing walls, and a first connecting portion for connecting the opposing walls to each other; A second connection is provided between the first connecting portion and the opposing surface of the mass member so as to extend in a longitudinal direction of the opposing wall, and connects the first connecting portion and the opposing surface of the mass member to each other. And have a top A plurality of first connecting portions are provided on both sides in the longitudinal direction of the opposing wall in the mass member, and the plurality of first connecting portions provided on the same side in the longitudinal direction of the opposing walls are mutually connected to the opposing walls. It is characterized by being displaced in the lateral direction.

Thereby, since the elastic body free length can be made longer than before, the elastic body can be thickened and the spring constant can be maintained. For this reason, durability of an elastic body can be improved, maintaining the resonant frequency of a dynamic damper.

That is, the elastic body free length in the conventional dynamic damper is the length from each opposing wall to the upper and lower surfaces of the mass member. On the other hand, in the dynamic damper of the present invention, the elastic body is provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and the opposing walls and the mass member in the longitudinal direction of the opposing wall are mutually connected. Since the connecting portions that connect the opposing surfaces are provided, the elastic body free length of the dynamic damper of the present invention is at least longer than the conventional elastic body free length. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

Each connecting portion is provided so as to extend in the longitudinal direction of the opposing wall between the first connecting portion that connects the opposing walls, and the first connecting portion and the opposing surface of the mass member. The elastic body free length is longer than that of the conventional elastic body free length by at least the second connecting portion. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

In the dynamic damper of the present invention, since the elastic body is disposed on both sides of the opposing wall in the longitudinal direction of the mass member and supports the mass member from both sides in the longitudinal direction, the mass member is parallel to the opposing wall during vibration. Can be prevented from rotating around the center of gravity in a simple plane. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

In addition, a plurality of first connecting portions are provided on both sides in the longitudinal direction of the opposing wall of the mass member, and the plurality of first connecting portions provided on the same side in the longitudinal direction of the opposing wall are displaced from each other in the short direction of the opposing wall. Therefore, the mass member can be prevented from rotating around the center of gravity in a plane parallel to the opposing wall during vibration. Accordingly, the elastic body can be prevented from being twisted when the dynamic damper vibrates, so that the durability of the elastic body can be further improved.

  According to the present invention, the free length of the elastic body can be made longer than before. Accordingly, since the elastic body can be thickened while maintaining the spring constant of the elastic body, the durability of the elastic body can be improved while maintaining the resonance frequency of the dynamic damper.

It is a perspective view which shows the state which attached the dynamic damper which concerns on Embodiment 1 of this invention to the seat back of the vehicle seat. It is a figure which shows the state which attached the dynamic damper which concerns on Embodiment 1 to the seat back of the vehicle seat, (a) is the figure seen from the vehicle back, (b) is the figure seen from the downward | lower direction, ( c) is a view from the side of the vehicle. It is the figure which looked at the state which attached the dynamic damper concerning Embodiment 2 to the seat back of the seat for vehicles from the vehicles back. It is the figure which looked at the state which attached the dynamic damper which concerns on Embodiment 3 to the seat back of the vehicle seat from the vehicle side. It is the figure which looked at the state which attached the dynamic damper which concerns on Embodiment 4 to the seat back of the vehicle seat from the vehicle side. It is a figure which shows the state which attached the dynamic damper which concerns on the reference example 1 to the seat back of a vehicle seat, (a) is the figure seen from the vehicle back, (b) is the figure seen from the vehicle side. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 and 2, the dynamic damper 1 according to the first embodiment of the present invention is attached to a seat back (vibration source side) of a vehicle seat (not shown). For example, the vibration when the vehicle travels or the vibration when the seatback is tilted) is attenuated. The dynamic damper 1 includes an outer metal fitting (attachment member) 2, a weight (mass member) 3, and a rubber elastic body 4. , Also referred to as the X direction) in the vehicle width direction, the lateral direction of the side wall portions 21, 22 (hereinafter also referred to as the Y direction) in the vehicle front-rear direction, and the opposing direction of the side wall portions 21, 22 (hereinafter referred to as the Z direction). Are also arranged so as to substantially match in the vertical direction.

  The outer metal fitting 2 includes a substantially rectangular bottom wall portion 20 and cross sections each having a substantially rectangular first and second side wall portions 21 and 22 extending from the upper and lower end edges of the bottom wall portion 20 toward the rear of the vehicle. A U-shaped metal fitting main body, a first attachment portion 23 extending upward from the rear end edge of the first side wall portion 21, and a second attachment portion 24 extending downward from the rear end edge of the second side wall portion 22. And have. The first mounting portion 23 has one bolt hole 23a at each of the left and right ends. The second mounting portion 24 is formed with one bolt hole 24a at the center and the right end in the X direction. The dynamic damper 1 is bolted and fixed to the seat back by bolts (not shown) inserted through these bolt holes 23a and 24a.

  The weight 3 is disposed between the first and second side wall portions 21 and 22, that is, inside the outer metal fitting 2, and a surface of a substantially rectangular parallelepiped metal member is covered with a rubber film. The weight 3 is shorter in the X direction than the outer metal fitting 2.

  The rubber elastic body 4 is provided between both side walls 21 and 22 and on both sides of the weight 3 in the X direction, and faces each other in the X direction of the side walls and the weight 3 (in the Y direction of the weight 3). (Parallel planes) 30 and 30 are connected to each other. That is, the rubber elastic body 4 connects both side surfaces of the side wall portions 21 and 22 in the X direction and both side surfaces of the weight 3 corresponding to the X direction both ends (that is, the facing surfaces 30 and 30).

  Each connecting portion 40 is provided to extend in the X direction between the first connecting portion 41 that connects the side wall portions 21 and 22 to each other, and the first connecting portion 41 and the facing surface 30. And second connection portions 42, 42 that connect 41 and the opposing surface 30.

  The first connecting portions 41 and 41 are arranged symmetrically in the X direction with respect to the first central axis 5 connecting the centers of the Z-direction facing surfaces (upper and lower surfaces) 31 and 31 of the weight 3 and both side wall portions. It is arranged on the rear end side between 21 and 22 (on the first and second attachment portions 23 and 24 side from the center in the Y direction). And the 1st connection parts 41 and 41 have connected both the X direction both ends side of both side wall parts 21 and 22, respectively. The first connecting portions 41 and 41 are linear quadrangular columns and have the same shape. Moreover, the part joined to the both side wall parts 21 and 22 of each 1st connection part 41 is formed in the shape of a square frustum which narrows toward the longitudinal direction center part of each 1st connection part 41. As shown in FIG.

Two second connecting members 42 are provided between the first connecting portions 41 and 41 and the facing surfaces 30 and 30 of the weight 3, respectively, and two second connecting portions 42 provided on the same side in the X direction. , 42 are arranged at an interval in the Z direction of the first connecting portion 41. The second connecting portions 42, 42 on the same side in the X direction are arranged symmetrically in the Z direction with respect to the second central axis 6 connecting the centers of the opposing surfaces 30, 30 of the weight 3. It is provided at both ends in the Z direction. Each second connecting portion 42 is a linear quadrangular prism, and is formed integrally with the first connecting portion 41 and the rubber film on the surface of the weight 3. The portion of each second connecting portion 42 that joins the opposing surface 30 of the weight 3 and the first connecting portion 41 is formed in a quadrangular frustum shape that narrows toward the center in the length direction of the second connecting portion 42. Has been. Moreover, the 2nd connection part 42,42,42,42 is mutually the same shape.

  As described above, according to the present embodiment, the free length of the elastic body is surely made longer than the length between the side walls 21 and 22 and the upper and lower surfaces 31 and 31 of the weight 3 which are the conventional free length of the elastic body. Therefore, it is possible to maintain the spring constant of the rubber elastic body 4 while making the rubber elastic body 4 thick. Therefore, it is possible to improve the durability of the rubber elastic body 4 while maintaining the resonance frequency of the dynamic damper 1.

  The inventors of the present application actually compared the durability of the rubber elastic body between the conventional product and the dynamic damper of the present invention. This comparison was performed by measuring the stress applied to the most stretched portion of the rubber elastic body during dynamic damper vibration. The dynamic damper of the present invention is a rubber elastic body made of the same material as that of the conventional product, and is designed to have the same resonance frequency while increasing its cross-sectional area by about 5 times. As a result of the measurement, the stress applied to the most stretched portion of the rubber elastic body 4 was about half that of the conventional product. Therefore, in the dynamic damper of the present invention, it was confirmed that the durability of the rubber elastic body was improved as compared with the conventional product.

  Further, since the rubber elastic bodies 4 are disposed on both sides in the X direction of the weight 3 and support the weight 3 on both sides in the X direction, the weight 3 rotates around the first central axis 5 when the dynamic damper 1 vibrates. Can be suppressed. Further, since the second connecting portions 42, 42, 42, 42 support the weight 3 at two different points in the Z direction on both sides in the X direction, the weight 3 supports the second central shaft 6 when the dynamic damper 1 vibrates. Rotation as a center can be suppressed. Therefore, the rubber elastic body 4 can be prevented from being twisted by the rotation of the weight 3, so that the durability of the rubber elastic body 4 can be further improved.

  Further, in order to dispose the first connecting portions 41, 41 on both sides of the weight 3 in the X direction, the weight 3 must be expanded in the Y direction, and the clearance between the weight 3 and the bottom wall portion 20 is the conventional dynamic. Although it is narrower than the damper, as described above, the first and second connecting portions 41 and 42 suppress the rotation of the weight 3 around the first and second central axes 5 and 6. The hitting sound caused by the collision with the two bottom wall portions 20 can be suppressed.

  In the present embodiment, two second connecting portions 42 are provided on the same side in the X direction of the weight 3, but one or three or more may be provided.

(Embodiment 2)
In the first embodiment, the first connecting portions 41 and 41 of the rubber elastic body 4 are linear, but in this embodiment, the first connecting portions 41 and 41 are curved in the X direction as shown in FIG. Is. This will be described below.

  The first connecting portions 41 and 41 are curved so that the center portion in the extending direction protrudes to the X direction opposite weight 3 side (outside) from both ends. The first connecting parts 41, 41 are arranged such that the center part in the extending direction is on the inner side than both ends in the X direction of the side wall parts 21, 22 of the outer metal fitting 2. The other points are almost the same as in the first embodiment.

  As described above, according to the present embodiment, the elastic body free length of the rubber elastic body 4 can be made longer than that in the case where the first connecting portions 41 and 41 are linear, and the spring constant of the rubber elastic body 4 is maintained. However, the rubber elastic body 4 can be made thicker. Therefore, the durability of the rubber elastic body 4 can be further improved while maintaining the resonance frequency of the dynamic damper 1.

  In the present embodiment, the first connecting portions 41 and 41 are curved such that the center portions in the extending direction protrude toward the opposite side of the X direction than the both ends, but the center portions in the extending direction are at both ends. You may curve so that it may protrude to the X direction weight 3 side (inside) rather than a part.

(Embodiment 3)
In the present embodiment, as shown in FIG. 4, the first connecting portions 41, 41 of the rubber elastic body 4 are curved in the Y direction. This will be described below.

  The first connecting portions 41 and 41 are curved such that the center portion in the extension direction protrudes toward the Y-direction bottom wall portion 20, and the center portion in the extension direction protrudes toward the Y-direction bottom wall portion 20 from both ends. The connecting position to the both side walls 21 and 22 in the Y direction is from the connecting position of the second connecting parts 42 and 42 to the opposing surfaces 30 and 30 of the weight 3 on the side opposite to the bottom wall 20. It is shifted to. The portion of each first connecting portion 41 that connects both ends and the location where the second connecting portions 42, 42 are connected is formed linearly from both ends upward or downward toward the bottom wall portion 20. Yes. Moreover, the part which connects the location where the 2nd connection parts 42 and 42 of each 1st connection part 41 were connected is formed in the Z direction at linear form. The other points are almost the same as in the first embodiment.

  As described above, in the present embodiment, the first connecting portions 41 and 41 are formed such that the center portions in the extending direction protrude toward the bottom wall portion 20 in the Y direction from both ends, and thus the weight 3 vibrates. When moving to the Y-direction anti-bottom wall portion 20 side, a force from both ends of the first connecting portions 41 and 41 toward the central portion in the extending direction acts, and the central portion in the extending direction is displaced toward the anti-bottom wall portion 20 side in the Y-direction Prevent you from doing. Therefore, since the deformation | transformation of the 1st connection parts 41 and 41 in the Y direction is suppressed, the rigidity of the rubber elastic body 4 in the Y direction can be improved.

  Moreover, since the elastic body free length of the rubber elastic body 4 can be made longer than the case where the 1st connection parts 41 and 41 are linear similarly to Embodiment 2, it is maintaining the resonant frequency of the dynamic damper 1. FIG. The durability of the rubber elastic body 4 can be further improved.

  In the present embodiment, the first connecting portions 41, 41 are formed such that the central portion in the extending direction protrudes toward the bottom wall portion 20 in the Y direction from both end portions. You may form so that it may protrude in the Y direction anti-bottom wall part 20 side. Moreover, although the 1st connection parts 41 and 41 are bent in linear form, you may curve smoothly similarly to Embodiment 2. FIG.

(Embodiment 4)
In this embodiment, as shown in FIG. 5, two first connecting portions 41 are provided on both sides of the weight 3 in the X direction. This will be described below.

  Two first connecting portions 41 are provided on both sides of the weight 3 in the X direction, and the two first connecting portions 41 and 41 provided on the same side in the X direction are arranged so as to be shifted from each other in the Y direction. . The two first connecting parts 41, 41 provided on the same side in the X direction are arranged at the same position in the X direction. When the dynamic damper 1 is viewed from the front (Y direction), the first connecting parts 41, 41 41 overlaps. The other points are almost the same as in the first embodiment.

  As described above, in the present embodiment, two first connecting portions 41 are provided on both sides of the weight 3 in the X direction, and the first connecting portions 41 and 41 provided on the same side in the X longitudinal direction are displaced from each other in the Y direction. Therefore, it is possible to more reliably suppress the weight 3 from rotating around the first central axis 5 when the weight 3 vibrates. Accordingly, the rubber elastic body 4 can be prevented from being twisted when the dynamic damper 1 vibrates, so that the durability of the rubber elastic body 4 can be further improved. Furthermore, the hitting sound caused by the collision between the weight 3 and the bottom wall portion 20 of the outer metal fitting 2 can be more reliably suppressed.

  In the present embodiment, two first connecting portions 41 are provided on both sides of the weight 3 in the X direction, but three or more may be provided. Moreover, although the several 1st connection part 41 provided in the X direction same side was arrange | positioned in the same position in the X direction, you may arrange | position so that it may mutually shift | deviate.

( Reference Example 1 )
In this reference example , as shown in FIG. 6, the side walls 21, 22 and the opposing surfaces 30, 30 are connected on both sides in the X direction of the weight 3. This will be described below.

Connecting portions 40, 40 of the first connecting portions 41 in the implementation form 1 is identical to that second connecting portions 42,42,42,42 are excluding the portion between the portion for connecting.

  That is, the connecting portions 40, 40 are third connecting portions 43, 43, extending in the Z direction from the side wall portions 21, 22 to the Z direction second central axis 6 side (inside) from the upper and lower surfaces 31, 31 of the weight 3. 43, 43, and the third connecting portions 43, 43, 43, 43 are provided so as to extend in the X direction between the Z-direction center side ends of the third connecting portions 43, 43, 43, 43 and the facing surfaces 30, 30 of the weight 3, respectively. 4th connection part 44,44,44,44 which mutually connects each Z direction center side edge part of part 43,43,43,43 and each opposing surface 30 and 30 is provided. That is, the 3rd and 4th connection parts 43 and 44 have connected the X direction both ends side of the side wall parts 21 and 22, and the opposing surfaces 30 and 30, respectively. The other points are almost the same as in the first embodiment.

As described above, in the present reference example , the third connecting portions 43, 43, 43, 43 extend in the Z direction from the side walls 21, 22 to the second central axis 6 side from the upper and lower surfaces 31, 31 of the weight 3. The free length of the elastic body can be surely made longer than the length between the side walls 21 and 22 and the upper and lower surfaces 31 and 31 of the weight 3 which are the conventional free length of the elastic body. Therefore, it is possible to maintain the spring constant of the rubber elastic body 4 while making the rubber elastic body 4 thick. Therefore, the durability of the rubber elastic body 4 can be improved while maintaining the resonance frequency of the dynamic damper 1.

(Other embodiments)
In each said embodiment and reference example , although the 1st-4th connection parts 41-44 were square pillars, it is not limited to this, Other shapes may be sufficient.

Moreover, in each said embodiment and reference example , although the outer metal fitting 2 was provided with the bottom wall part 20, it is not limited to this, The 1st and 2nd side wall parts 21 and 22 and the 1st and 2nd attachment part 23 , 24 may be provided.

Moreover, in each said embodiment and reference example , although the dynamic damper 1 is applied to the seat back of the vehicle seat, it is not limited to this, You may apply to the other part of a vehicle.

In each of the above-described embodiments and reference examples , the first and third connecting portions 41 and 43 are different in cross-sectional area from the second and fourth connecting portions 42 and 44, but are not limited thereto. The cross-sectional areas of the four connecting portions 41 to 44 may be the same. In this case, the spring constant of the rubber elastic body 4 can be accurately maintained. Therefore, the resonance frequency of the dynamic damper 1 can be accurately maintained.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the dynamic damper according to the present invention can be applied to uses for suppressing the breakage of the elastic body.

1 Dynamic damper 2 Outer bracket (Mounting member)
21 1st side wall part (opposite wall)
22 Second side wall (opposite wall)
3 Weight (mass member)
30 Opposing surface 4 Rubber elastic body (elastic body)
40 connecting portion 41 first connecting portion 42 second connecting portion 43 third connecting portion 44 fourth connecting portion

Claims (7)

A dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side;
A mounting member having two opposing walls facing each other;
A mass member provided between the opposing walls;
Provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and connecting the opposing walls and opposing surfaces facing each other in the longitudinal direction of the opposing wall in the mass member. An elastic body having a connecting portion ,
Each said connection part is provided so that it may extend in the opposing direction of the said both opposing walls, Between the said 1st connection part which mutually connects the said opposing walls, and the said 1st connection part and the said opposing surface of the said mass member And a second connecting part that connects the first connecting part and the opposing surface of the mass member to each other.
A plurality of the second connecting portions are provided between the first connecting portion and the facing surface of the mass member, respectively.
The plurality of second connecting portions provided on the same side of the opposing wall in the longitudinal direction are arranged with a space in the opposing direction of the opposing walls of the first connecting portion. damper. The dynamic damper according to claim 1 ,
The dynamic damper according to claim 1, wherein the first connecting portion is formed such that a central portion in the extending direction protrudes to one side in the longitudinal direction of the facing wall from both ends. The dynamic damper according to claim 1 or 2 ,
The first connecting portion is formed such that the central portion in the extending direction protrudes to one side in the short direction of the opposing wall from both ends,
The connecting position of the first connecting portion to the facing wall is deviated from the connecting position of the second connecting portion to the facing surface of the mass member in the short direction of the facing wall. Dynamic damper. The dynamic damper according to any one of claims 1 to 3 ,
A plurality of the first connecting portions are provided on each of both sides in the longitudinal direction of the facing wall in the mass member,
The dynamic damper, wherein the plurality of first connecting portions provided on the same side in the longitudinal direction of the facing wall are arranged so as to be shifted from each other in the short direction of the facing wall. A dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side;
A mounting member having two opposing walls facing each other;
A mass member provided between the opposing walls;
Provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and connecting the opposing walls and opposing surfaces facing each other in the longitudinal direction of the opposing wall in the mass member. An elastic body having a connecting portion,
Each said connection part is provided so that it may extend in the opposing direction of the said both opposing walls, Between the said 1st connection part which mutually connects the said opposing walls, and the said 1st connection part and the said opposing surface of the said mass member And a second connecting part that connects the first connecting part and the opposing surface of the mass member to each other.
The dynamic damper according to claim 1, wherein the first connecting portion is formed such that a central portion in the extending direction protrudes to one side in the longitudinal direction of the facing wall from both ends. A dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side;
A mounting member having two opposing walls facing each other;
A mass member provided between the opposing walls;
Provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and connecting the opposing walls and opposing surfaces facing each other in the longitudinal direction of the opposing wall in the mass member. An elastic body having a connecting portion,
Each said connection part is provided so that it may extend in the opposing direction of the said both opposing walls, Between the said 1st connection part which mutually connects the said opposing walls, and the said 1st connection part and the said opposing surface of the said mass member And a second connecting part that connects the first connecting part and the opposing surface of the mass member to each other.
The first connecting portion is formed such that the central portion in the extending direction protrudes to one side in the short direction of the opposing wall from both ends,
The connecting position of the first connecting portion to the facing wall is deviated from the connecting position of the second connecting portion to the facing surface of the mass member in the short direction of the facing wall. Dynamic damper. A dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side;
A mounting member having two opposing walls facing each other;
A mass member provided between the opposing walls;
Provided between the opposing walls and on both sides in the longitudinal direction of the opposing wall in the mass member, and connecting the opposing walls and opposing surfaces facing each other in the longitudinal direction of the opposing wall in the mass member. An elastic body having a connecting portion,
Each said connection part is provided so that it may extend in the opposing direction of the said both opposing walls, Between the said 1st connection part which mutually connects the said opposing walls, and the said 1st connection part and the said opposing surface of the said mass member And a second connecting part that connects the first connecting part and the opposing surface of the mass member to each other.
A plurality of the first connecting portions are provided on each of both sides in the longitudinal direction of the facing wall in the mass member,
The dynamic damper, wherein the plurality of first connecting portions provided on the same side in the longitudinal direction of the facing wall are arranged so as to be shifted from each other in the short direction of the facing wall.

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