JP2005076662A - Contact type damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact type damping device of a new structure capable of preventing the occurrence of irregular vibration of a vibrating member by preventing unstable displacement of a mass member. <P>SOLUTION: Coupling members 30a and 30b to directly or indirectly elastically couple the mass member 16 to the vibrating member 32 are situated on both sides in a central axial direction of the mass member to directly and indirectly elastically couple the mass member 16 to the vibration member 32. Rotational displacement around the central axis of the mass member 16 is limited as displacement in a direction extending perpendicularly to the axis of the mass member 16 is allowed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration damping device having a novel structure that can be easily manufactured with a simple structure and can exhibit an effective vibration damping effect, and in particular, is disposed so as to be capable of relative displacement with respect to a vibration member. The present invention relates to a novel structure of a contact-type vibration damping device that obtains a vibration damping effect based on the striking of a mass member against a vibrating member.

  Conventionally, in a vibration member where vibration is a problem, such as a car body of an automobile, a metal mass is elastically supported via a rubber elastic body as a vibration control device for reducing the vibration. A dynamic damper that constitutes a sub-vibration system for the vibration member by caulking is widely used. In such a dynamic damper, the natural frequency of the sub-vibration system is tuned to a vibration frequency that causes a problem in the vibration member that is the main vibration system, and effective damping against vibrations in the tuning frequency range of the vibration member. An effect can be obtained.

  However, in such a vibration damping device consisting of a secondary vibration system, the change in tuning frequency and vibration damping characteristics increase due to the temperature dependence of the spring characteristics of the rubber elastic body, and the desired vibration damping effect is stabilized. There was a problem that it was difficult to obtain. In addition, since the frequency range where the effective damping effect is exhibited is narrow, for example, in a vibration member of an automobile in which the frequency range of vibration to be controlled changes depending on the traveling state, etc., a sufficiently effective damping is achieved. In addition to the difficulty in obtaining the vibration effect, there was a problem that the tuning accuracy of the sub-vibration system was required and manufacturing and management were difficult.

  Therefore, in view of such a problem, the present applicant previously arranged a mass member so as to be relatively displaceable with respect to the vibration member in Patent Document 1 and the like, and the mass member has a spherical or cylindrical shape. A contact-type vibration damping device has been proposed in which the mass member is elastically brought into contact with the vibration member when the vibration is input, by making the contact surface face the vibration member. The vibration damping device having such a structure can be manufactured with a simple structure and can obtain an effective vibration damping effect against vibration over a wide frequency range. Moreover, by providing a spherical or cylindrical contact surface, the jumping-like displacement of the mass member at the time of vibration input is efficiently generated under a low frictional force, and the vibration damping effect due to hitting Is more effectively exhibited, and it is possible to obtain a damping effect by striking the mass member even against input vibrations in a plurality of directions. Therefore, it can be used particularly advantageously for vibration members such as handlebars and operation levers of heavy machinery in motorcycles.

  However, as a result of further studies by the present inventors, the mass member is non-adherent relative to the vibration member and can be relatively displaced in the contact-type vibration damping device having the conventional structure as described above. The problem that the displacement of the mass member becomes unstable depending on the use condition and the like, and irregular vibration may newly occur in the vibration member, has been clarified.

International Publication WO00 / 14429

  Here, the present invention has been made in the background of the above-described circumstances, and the problem to be solved is to prevent unstable displacement of the mass member and to prevent irregular vibration in the vibration member. An object of the present invention is to provide a contact-type vibration damping device having a novel structure capable of avoiding the occurrence.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.

  According to a first aspect of the present invention, a mass member is disposed so as to be relatively displaceable with respect to the vibration member, and the mass member is positioned opposite the vibration member with a spherical or cylindrical contact surface. In the contact-type vibration damping device in which the mass member is elastically brought into contact with the vibration member at the time of vibration input, the mass member is attached to the vibration member on both sides in the central axis direction of the mass member. A connecting member that is elastically connected directly or indirectly to the mass member is provided, and rotational displacement around the central axis of the mass member is limited while allowing displacement in the direction perpendicular to the axis of the mass member. .

  In the contact-type vibration damping device having the structure according to this aspect, the mass member is displaced relative to the vibration member based on the excitation force exerted from the vibration member to the mass member, and the mass member is The vibration member is repeatedly hit. Then, when the impact force based on the contact (contact) of the mass member with the vibration member is exerted on the vibration member, based on the phase difference between the vibration in the vibration member and the impact force due to the contact of the mass member, The vibration damping effect that is offset against the vibrating member is exhibited.

  In particular, in the contact-type vibration damping device according to this aspect, the mass member disposed so as to be relatively displaceable with respect to the vibration member is directly or indirectly connected to the vibration member by the connecting member on both sides in the central axis direction. Therefore, the rotational displacement around the central axis of the mass member can be prevented, and thereby the occurrence of irregular vibration in the vibration member can be avoided. That is, in the contact-type vibration damping device having a conventional structure, the irregular vibration in the vibration member confirmed by the present inventors, the mass member rotates around the central axis by further research and experiment by the present inventors. A new finding has been obtained that it may be caused by being displaced so as to dance in the circumferential direction while striking the vibrating member in a direction orthogonal to the central axis.

  Therefore, in the contact-type vibration damping device according to this aspect, the mass member is elastically connected to the vibration member on both sides of the central axis thereof, so that the axis perpendicular to the mass member serving as the vibration input direction to be damped is obtained. In the direction, the displacement of the mass member relative to the vibration member is allowed substantially independently, while in the axial direction and the circumferential direction, the displacement of the mass member relative to the vibration member is constrained. As a result, irregular vibration caused by the displacement of the mass member in the circumferential direction and the like is advantageously secured while advantageously ensuring the damping effect on the vibration to be damped, which is exhibited based on the striking of the mass member against the vibrating member. It has succeeded in suppressing it efficiently, and as a whole, an extremely excellent vibration damping effect can be exhibited.

  The mass member in this aspect is not particularly limited as long as the mass member can be opposed to the vibration member with a spherical or cylindrical contact surface. For example, the mass member has a spherical shape, a cylindrical shape, a cylindrical shape, or the like. As described above, any one having a circular shape or an annular shape having a cross section perpendicular to the axis can be adopted, and the size of the cross section is not necessarily required to be constant over the entire length in the central axis direction. Absent.

  Further, in this aspect, “the mass member is elastically brought into contact with the vibrating member” not only when the mass member is brought into direct and elastic contact with the vibrating member. The case where the mass member is brought into direct and elastic contact with another member fixed to the vibration member is also included.

  Furthermore, in this aspect, “the connecting member that elastically connects the mass member directly or indirectly to the vibrating member” is not only the connecting member that elastically connects the mass member directly to the vibrating member, but also the mass member. It also includes a connecting member that directly elastically connects to other members fixed to the vibration member.

  Furthermore, in this aspect, “elastically connecting” of “a connecting member that elastically connects the mass member directly or indirectly to the vibration member” constrains rotational displacement around at least the central axis of the mass member. This means that the mass member is directly or indirectly connected to the vibrating member with elasticity for the purpose, and when the mass member is displaced in a jumping state with respect to the vibrating member, the connecting member must be elastically deformed. It does not mean that the mass member is directly or indirectly connected to the vibration member.

  According to a second aspect of the present invention, in the contact-type vibration damping device according to the first aspect, the contact that is formed integrally or separately from the vibration member and receives vibration to be controlled is input. A member is fixed to the vibration member, and the mass member is elastically connected to the corresponding contact member by the connecting member. According to this aspect, it is possible to manage the contact condition of the mass member to the contact member by considering the component dimensional accuracy of the contact member and the mass member. The damping effect can be exhibited more effectively and stably.

  According to a third aspect of the present invention, in the contact-type vibration damping device according to the second aspect, the contact member is formed of a rigid housing, an accommodation space is formed inside the housing, and the accommodation is performed. The mass member is accommodated in the space, and the mass member is elastically connected to the housing by the connecting member. According to this aspect, it is possible to manage the contact condition of the mass member with the housing by taking into account the component dimensional accuracy of the mass member and the housing. It can be exhibited more effectively and stably.

  In particular, in the contact-type vibration damping device according to the present aspect, it is desirable that foreign matter can be prevented from entering the storage space by substantially blocking the storage space from the external space. This not only prevents direct damage to the connecting member, mass member, housing, etc. due to interference of foreign matter existing in the external space, but also prevents foreign matter such as dust or dust from contacting the mass member with the housing. It is possible to prevent a decrease in the vibration damping effect caused by entering between the surfaces and hindering the displacement of the mass member, and to stably obtain the target vibration damping effect.

  According to a fourth aspect of the present invention, in the contact-type vibration damping device according to the second aspect, the contact member is formed to include a vibration-damping rod that is fixedly extended from the vibration member, In the state where the mass member is cylindrical or annular and the mass member is extrapolated to the damping rod, both axial ends of the mass member are elastically connected to the vibration member by the connecting members, respectively. This is a feature. According to this aspect, it is possible to manage the contact condition of the mass member with the damping rod by considering the component dimensional accuracy of the mass member and the damping rod. The damping effect can be exhibited more effectively and stably.

  According to a fifth aspect of the present invention, in the contact-type vibration damping device according to the first aspect, the vibration member has a rod shape, while the mass member has a cylindrical shape or an annular shape. It is characterized in that both end portions in the axial direction of the mass member are elastically connected to the vibrating member by the connecting member in a state of being extrapolated to the vibrating member. According to this aspect, the contact-type vibration damping device is applied to the vibration member having a rod shape, and the contact of the mass member with the vibration member is stabilized to avoid the occurrence of irregular vibration. A contact-type vibration damping device that can be used is advantageously realized.

  According to a sixth aspect of the present invention, in the contact-type vibration damping device according to any one of the first to fifth aspects, the mass member is changed to the vibration member or the contact member by elastic deformation of the connection member. On the other hand, the natural frequency of a vibration system that is subjected to vibration displacement and repeatedly hits in a repeated jumping state is tuned to a frequency range of a resonance frequency to be damped in the vibration member. According to this aspect, it is avoided that the amount of jumping displacement of the mass member due to the change of the phase difference between the displacement of the mass member and the vibration of the vibrating member due to the change in frequency is significantly reduced. Therefore, even when the vibration to be damped in the vibration member extends over a plurality of or a wide frequency range, the mass member is efficiently leap-displaced, and the mass member strikes the vibration member or the contact member. The vibration control effect based on the contact (contact) can be efficiently exhibited.

  The natural frequency of the vibration system of the excitation displacement when the mass member jumps is tuned by adjusting the mass of the mass member constituting the mass system, the spring constant of the connecting member constituting the spring system, or the like. It is possible.

According to a seventh aspect of the present invention, in the contact-type vibration damping device according to any one of the second to sixth aspects, the contact member and the mass member are both 5 × 10 ³ MPa or more. The elastic member is formed of a rigid material having an elastic modulus, and a rubber elastic body layer is attached to a contact surface of at least one of the corresponding contact member and the mass member, and the mass member is in contact with the mass member through the rubber elastic layer. It is characterized by elastically hitting the member. According to this embodiment, for example, by adopting a hard synthetic resin material or the like that is set to 5 × 10 ^{3 to} 5 × 10 ⁴ MPa, it is possible to reduce the hitting sound and reduce the vibration damping effect in the low frequency range. Improvements and the like can be advantageously achieved. In addition, for example, by adopting a rigid material such as a metal having an elastic modulus of 5 × 10 ⁴ MPa or more, it is possible to improve the vibration damping effect in a high frequency range, and the mass mass with a compact size. Can be easily secured.

  As is apparent from the above description, in the contact-type vibration damping device structured according to the present invention, the mass member disposed so as to be relatively displaceable with respect to the vibration member is connected on both sides in the central axis direction. Since the mass member is elastically connected to the vibration member, rotational displacement around the central axis of the mass member can be prevented, so that positive contact by striking the vibration member due to displacement of the mass member in the direction perpendicular to the axis can be prevented. The generation of irregular vibrations in the vibration member, which is considered to be caused by the displacement of the mass member around the central axis, etc., can be avoided while effectively ensuring an objective or counterbalanced vibration damping effect.

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

  First, FIGS. 1 and 2 show a vibration damping device 10 as a first embodiment of the present invention. The vibration damping device 10 has a structure in which a mass fitting 16 as a mass member is accommodated and disposed in an accommodation space 14 formed by a housing 12 as an abutting member.

More specifically, the housing 12 includes a housing main body 18, a mounting plate 20, and connecting plates 22a and 22b. Each of the housing main body 18, the mounting plate 20 and the connecting plates 22a and 22b has an elastic modulus. It is made of a hard synthetic resin material of 5 × 10 ³ MPa or more, or a metal material such as an aluminum alloy. The housing main body 18 is provided with side wall portions 26, 26 projecting to one side in the thickness direction of the bottom wall portion 24 at both ends in the width direction (left-right direction in FIG. 2) of the bottom wall portion 24 having a longitudinal plate shape. It has a groove shape as a whole. The mounting plate 20 has a rectangular flat plate shape as a whole, and its longitudinal dimension is larger than the longitudinal dimension of the housing body 18, and its width dimension is in the width direction of the housing body 18. It is the same size as the dimensions. Each of the connecting plates 22a and 22b has a rectangular flat plate shape as a whole, and has a shape corresponding to the end surface of the housing body 18 in the longitudinal direction.

  The connecting plates 22a and 22b are overlapped with the end face in the longitudinal direction of the housing body 18 and fixed by bonding, welding or the like, and the mounting plate 20 is overlapped with the upper end face of the housing body 18 By being fixed by welding or the like, a storage space 14 is formed which has a square shape with the same internal dimensions in two directions orthogonal to each other and extends in a longitudinal direction over a predetermined length. In particular, in the present embodiment, the accommodation space 14 is blocked from the external space.

  In this manner, the mass bracket 16 is accommodated in the accommodation space 14 formed by the housing 12. The mass bracket 16 may be formed of ceramic, synthetic resin, or an appropriate composite material, but in the present embodiment, the mass bracket 16 is formed of a metal material with high specific gravity such as iron, and has a solid cylindrical shape as a whole. Presents. In particular, in the present embodiment, the outer diameter dimension of the mass metal fitting 16 is smaller than the inner dimension of the housing body 18. In addition, the axial dimension of the mass fitting 16 is sufficiently smaller than the longitudinal dimension of the accommodation space 14. Furthermore, a contact rubber layer 28 as a rubber elastic body layer that forms an elastic contact portion over the entire surface of the mass metal fitting 16 is attached. In this case, the abutting rubber layer 28 has a Shore D hardness of 80 or less according to ASTM standard D2240 in order to reduce a hitting sound when the mass metal fitting 16 hits the housing 12 and to improve a vibration damping effect. More preferably, it is formed of a rubber material having a Shore D hardness of 20 to 40.

  The mass bracket 16 is elastically connected to the housing 12 by connecting rubber elastic bodies 30a and 30b as connecting members in a state of being accommodated in the accommodating space 14. Each of the connecting rubber elastic bodies 30a and 30b is made of a conventionally known rubber material and has a cylindrical shape extending in the axial direction with a substantially constant circular cross section as a whole. Further, the outer diameter dimensions of the connecting rubber elastic bodies 30a and 30b are sufficiently smaller than the outer diameter dimension of the mass fitting 16, so that the elastic deformation in the direction perpendicular to the axis can be easily performed. ing. Therefore, in this embodiment, the connecting rubber elastic bodies 30a and 30b are made of the same rubber material and have the same shape as each other, thereby having the same spring characteristics. ing.

  The connecting rubber elastic body 30a has one end in the axial direction vulcanized and bonded to the connecting plate 22a, while the other end in the axial direction has one end in the axial direction of the mass fitting 16 in the contact rubber layer 28. The connecting rubber elastic body 30b is integrally formed on a portion attached to the end face, and one end of the connecting rubber elastic body 30b is attached to the other end face in the axial direction of the mass metal fitting 16 in the contact rubber layer 28. The other end in the axial direction is vulcanized and bonded to the connecting plate 22b. Thereby, the axial direction both ends of the mass metal fitting 16 are elastically connected with respect to the housing 12 by the connection rubber elastic bodies 30a and 30b. Therefore, in this embodiment, the mass metal fitting 16 and the connecting rubber elastic bodies 30a, 30b are positioned on the same central axis in a state where the connecting rubber elastic bodies 30a, 30b are not elastically deformed. The contact rubber layer 28 and the connecting rubber elastic bodies 30a and 30b are integrally formed.

  Further, the mass metal fitting 16 is elastically connected to the housing 12 by the connecting rubber elastic bodies 30a and 30b, so that the mass system is constituted by the mass metal fitting 16, and the spring system is constituted by the connecting rubber elastic bodies 30a and 30b. A vibration system is formed, and particularly in this embodiment, the natural frequency of such a vibration system is a vibration described later by appropriately adjusting the mass of the mass bracket 16 and the spring constants of the connecting rubber elastic bodies 30a and 30b. The member 32 is tuned to the frequency range of the resonance frequency to be damped.

  In this manner, the mass bracket 16 is displaced in a direction perpendicular to the housing 12 with respect to the housing 12 in a state where the mass bracket 16 is elastically coupled to the housing 12 by the coupling rubber elastic bodies 30 a and 30 b and accommodated in the accommodation space 14. As a result, the surface of the abutting rubber layer 28 deposited with a constant thickness over the entire outer peripheral surface of the mass metal fitting 16 is repeatedly abutted and separated from the inner surface of the housing 12. Winning is to occur. That is, when the connecting rubber elastic bodies 30 a and 30 b are elastically deformed, the mass metal fitting 16 can be displaced relative to the inner surface of the housing 12. Specifically, as shown in FIGS. 1 and 2, the mass metal fitting 16 is attached to the cylindrical outer peripheral surface of the contact rubber layer 28 in a state where the mass metal fitting 16 is positioned at the movement center in the direction perpendicular to the axis. Between the plate 20 and the bottom wall portion 24 of the housing body 18, a clearance dimension: δa of 0 to 0.5 mm is set, respectively, and the cylindrical outer peripheral surface of the contact rubber layer 28 and the housing body 18 are set. A gap dimension: δb having an appropriate size larger than 0 mm is set between both side wall portions 26 and 26 in FIG. Depending on the spring constants set for the connecting rubber elastic bodies 30a and 30b, the mass metal fitting 16 is displaced vertically downward (downward in FIG. 2) of the housing 12 due to the action of gravity, so that the housing body 18 You may arrange | position in the state which adjoined with respect to the bottom wall part 24, or was carried in contact.

  In the vibration damping device 10 having such a structure, the upper surface of the mounting plate 20 constituting the housing 12 is overlapped with a vibration member 32 such as an automobile body, and bolts formed at both longitudinal ends of the mounting plate 20. The bolt 36 inserted through the insertion holes 34 is fixedly attached to the vibration member 32.

  When the vibration member 32 is vibrated in the vertical direction or the horizontal direction in FIG. 2 with the vibration damping device 10 mounted on the vibration member 32 in this way, the housing 12 is integrated with the vibration member 32. Vibration energy is transmitted to the mass fitting 16 by elastically deforming the connecting rubber elastic bodies 30a and 30b that elastically connect the mass fitting 16 to the housing 12, and the mass fitting 16 is moved into the housing. 12 is repeatedly displaced in a state of jumping. Accordingly, the mass metal member 12 is repeatedly abutted against the housing 12 via the contact rubber layer 28 in the direction perpendicular to the axis, and the impact force applied from the housing 12 to the vibration member 32 at the time of the hitting causes the vibration member 32 to be applied. The counteracting damping effect based on the phase difference can be exerted against the induced vibration.

  In particular, in the present embodiment, since the mass metal fitting 16 is elastically connected to the housing 12 by the connecting rubber elastic bodies 30a and 30b at both axial ends, rotational displacement around the central axis of the mass metal fitting 16 can be prevented. Thereby, the occurrence of irregular vibration in the vibration member 32 can be avoided.

  Further, in this embodiment, the mass metal fitting 16 does not directly contact the vibration member 32 but directly contacts the housing 12, thereby exhibiting an offset vibration damping effect indirectly with respect to the vibration member 32. Therefore, regardless of the dimensional accuracy of the vibration member 32, the housing of the mass bracket 16 can be obtained by taking into account the component accuracy of the housing 12 and the mass bracket 16 and the thickness dimensional accuracy of the contact rubber layer 28. 12 can be managed with high accuracy.

  Further, in the present embodiment, both ends in the axial direction of the mass metal fitting 16 are elastically connected to the housing 12 by connecting rubber elastic bodies 30a and 30b, and these connecting rubber elastic bodies 30a and 30b have the same spring characteristics. In addition, since the connecting rubber elastic bodies 30a and 30b and the mass fitting 16 are positioned on the same central axis in a state where the mass fitting 16 is positioned at the movement center with respect to the housing 12, the connection is made. Based on the elastic deformation of the rubber elastic bodies 30a and 30b, an external force in a direction in which the central axis of the mass fitting 16 is inclined with respect to the longitudinal direction of the housing 12 relative to the mass fitting 16, or the mass fitting 16 around the central axis. It is possible to prevent external force in the direction in which the mass bracket 16 is rotated from being displaced, and thereby the displacement of the mass bracket 16 in the direction perpendicular to the axis can be reduced. It is possible to Joka. That is, the elastic main shaft of the support spring system by the connecting rubber elastic bodies 30a and 30b passes through the center of gravity of the mass fitting 16 and is set in the direction perpendicular to the axis, whereby the mass fitting 16 is displaced in the direction perpendicular to the axis. As a result, the problem such as deterioration of vibration caused by striking due to irregular displacement of the mass metal fitting 16 is more effectively avoided, and the damping effect based on striking is more effectively achieved. And it becomes possible to obtain stably.

  3 and 4 show a vibration damping device 38 as a second embodiment of the present invention. The vibration damping device 38 has a structure in which a mass metal fitting 44 as a mass member is accommodated and disposed in an accommodation space 42 formed by a housing 40 as an abutting member.

More specifically, the housing 40 includes a housing main body 46 and a lid body 48, and both the housing main body 46 and the lid body 48 are hard synthetic resin materials having an elastic modulus of 5 × 10 ³ MPa or more. Or a metal material such as an aluminum alloy. The housing main body 46 has a structure in which a mounting plate portion 52 having a disk shape is integrally formed with one end portion in the axial direction of the cylindrical portion 50 extending in the axial direction with substantially constant inner and outer diameter dimensions. Has been. That is, in the present embodiment, one end portion in the axial direction of the cylindrical portion 50 is closed by the mounting plate portion 52. On the other hand, the lid 48 has a disk shape, and the outer diameter dimension thereof is the same as the outer diameter dimension of the cylindrical portion 50. Then, the lid 48 is superimposed on the other end surface in the axial direction of the housing main body 46, that is, the opening end surface of the housing main body 46, and is fixed by welding, adhesion, or the like. An extended accommodation space 42 is formed.

  Thus, the mass metal fitting 44 is accommodated in the accommodation space 42 formed by the housing 40. The mass metal fitting 44 is made of a metal material having a high specific gravity such as iron and has a solid cylindrical shape as a whole. In particular, in this embodiment, the outer diameter dimension of the mass metal fitting 44 is smaller than the inner diameter dimension of the housing body 46. Further, the axial dimension of the mass metal fitting 44 is sufficiently smaller than the axial dimension of the accommodating space 42. Furthermore, a contact rubber layer 54 is attached to the entire surface of the mass metal fitting 44 over the entire surface. Therefore, the abutting rubber layer 54 has a Shore D hardness of 80 or less according to ASTM standard D2240 in order to reduce the hitting sound when the mass metal fitting 44 hits the housing 40 and to improve the vibration damping effect. More preferably, it is formed of a rubber material having a Shore D hardness of 20 to 40.

  Moreover, the mass metal fitting 44 is connected to the housing 40 at both ends in the axial direction by connecting rubber elastic bodies 56a and 56b as connecting members. Each of the connecting rubber elastic bodies 56a and 56b has a string shape extending in the axial direction with a substantially circular cross section. In particular, in this embodiment, the connecting rubber elastic bodies 56a and 56b are perpendicular to the mass fitting 44. The length, cross-sectional area, spring constant, etc. are set so that there is almost no spring component in the direction. As described above, the connecting rubber elastic bodies 56a and 56b have almost no spring component with respect to the mass fitting 44 that is relatively displaced in the direction perpendicular to the axis within the housing 40. With respect to the displacement around the central axis, the spring component is effective in the torsional direction.

  The connecting rubber elastic body 56a is integrally formed at a portion where one end portion is attached to the other end portion in the axial direction of the mass metal fitting 44 in the contact rubber layer 54, while the other end portion is formed. The lid 48 is attached to the central portion. The connecting rubber elastic body 56 b is attached to the central portion of the fixing plate 58 that is bolted to the mounting plate portion 52, while the other end portion is in the contact rubber layer 54. It is formed integrally with a portion attached to one end of the mass metal fitting 44 in the axial direction. Here, the fixed plate 58 is formed of a rigid material such as a metal material, and has a disk shape having an outer diameter smaller than the outer diameter of the mounting plate portion 52.

  In this manner, the mass metal fitting 44 is connected to the housing 40 by the coupling rubber elastic bodies 56a and 56b and accommodated in the accommodation space 42, and the mass metal fitting 44 is a cylinder in the housing main body 46 in the accommodation space 42. The difference between the inner diameter dimension D of the shaped part 50 and the outer diameter dimension d of the contact rubber layer 54: δc = (D−d) is displaceable in the direction perpendicular to the axis. In particular, in the present embodiment, δc = 0 to 1.0 mm is set.

  The vibration damping device 38 having such a structure can be assembled by press-fitting or the like into the hollow rod-shaped vibration member 60 such as a handlebar in a motorcycle. When the vibration member 60 is vibrated in a direction perpendicular to the axis in a state where the vibration device 38 is mounted on the vibration member 60, the housing 40 is vibrated integrally with the vibration member 60 and formed by the housing 40. Vibration energy is transmitted to the mass fittings 44 accommodated and arranged in the accommodation space 42, and the mass fittings 44 are repeatedly jumped and displaced in the direction perpendicular to the axis. As a result, the mass metal fitting 44 is repeatedly hit against the housing 40 in the direction perpendicular to the axis via the contact rubber layer 54, and vibration is generated by the impact force applied from the housing 40 to the vibrating member 60 at the time of such hitting. An offset damping effect based on the phase difference can be exhibited with respect to the vibration induced in the member 60.

  5 and 6 show a vibration damping device 62 as a third embodiment of the present invention. The vibration damping device 62 has a structure in which a mass metal fitting 66 as a mass member is extrapolated to the support rod 64.

  More specifically, as shown in the drawing, the support rod 64 extends straight with a circular cross section having a constant outer diameter at least over a predetermined length in the axial direction, and the straight portion is attached to the mass. Portion 68. The support rod 64 may itself be a vibration member that generates vibration to be damped. Alternatively, the vibration member to be damped may be separately provided, and the vibration member to be damped may be exerted by being fixed to the vibration member with a bolt, welding, or the like. The damping rod that forms the contact member is constituted by the support rod 64. Further, the structure and shape of the portion other than the mass mounting portion 68 in the support rod 64 are not illustrated, but are not limited in any way. For example, when the damping rod is configured by the support rod 64, A portion not shown may be modified to be fixed to the vibration member with a bolt or the like.

  On the other hand, the mass metal fitting 66 is formed of a metal material having a high specific gravity such as iron, and has a thick cylindrical shape extending over the entire circumference around the central axis with a constant rectangular cross-sectional shape. Further, a contact rubber layer 70 as a rubber elastic body layer is attached to the surface of the mass metal fitting 66 over the entire surface. Further, on the inner peripheral surface of the contact rubber layer 70, one annular protrusion 72 is formed on each side in the axial direction so as to protrude in the inner peripheral side with a mountain-shaped cross section and extend in the circumferential direction.

  The mass metal fitting 66 is elastically connected to the support rod 64 by connecting rubber elastic bodies 74 and 74 as connecting members in a state of being extrapolated to the support rod 64. Each of the connecting rubber elastic bodies 74 and 74 has a substantially cylindrical shape as a whole, and has a substantially constant inclination angle that gradually decreases in diameter as it goes outward in the axial direction from one axial end surface of the mass fitting 66. It has a tapered cylindrical shape. Further, a cylindrical mounting tube portion 76 that extends further outward in the axial direction with a substantially constant inner / outer diameter is integrally formed at the axially protruding tip portion (small-diameter side end portion) of the connecting rubber elastic body 74. ing. Further, a concave groove 78 for attaching a fastening band extending continuously in the circumferential direction is formed on the outer peripheral surface of the one mounting cylinder portion 76. Each of the connecting rubber elastic bodies 74 and 74 having such a structure is integrally formed with the end portion of the large-diameter side attached to the axial end surface of the mass metal fitting 66 in the contact rubber layer 70. Thus, both end portions in the axial direction of the mass fitting 66 are elastically supported by the connecting rubber elastic bodies 74 and 74 with respect to the support rod 64.

  Therefore, in this embodiment, since the inner diameter dimension of the mounting cylinder portion 76 is slightly smaller than the outer diameter dimension of the support rod 64, the support rod 64 is press-fitted into the inner hole of the mounting cylinder portion 76. As a result, the inner peripheral surface of the mounting cylinder portion 76 is brought into close contact with the outer peripheral surface of the support rod 64 based on the elasticity of the mounting cylinder portion 76. Further, by winding and fastening a fastening band or the like (not shown) formed of a hard material such as metal to the concave groove 78 provided in the attachment cylinder portion 76, the attachment cylinder portion 76 is fixed to the support rod 64. It can be firmly fixed so as not to move in the axial direction and the circumferential direction.

  Further, the mass metal fitting 66 is elastically connected to the support rod 64 by the connecting rubber elastic bodies 74 and 74, so that the mass system is constituted by the mass metal fitting 66 and the spring system is constituted by the connecting rubber elastic bodies 74 and 74. Two vibration systems are formed. In particular, in the present embodiment, the natural frequency of such a vibration system is such that the resonance frequency to be damped in the support rod 64 by appropriately adjusting the mass of the mass fitting 66 and the spring constants of the connecting rubber elastic bodies 74 and 74. It is tuned to the frequency range. In the present embodiment, the connecting rubber elastic bodies 74 and 74 have the same spring characteristics.

  In this manner, the mass metal fitting 66 is extrapolated to the support rod 64, and both end portions in the axial direction are elastically connected to the support rod 64 by the connection rubber elastic bodies 74, 74. A predetermined gap is formed between the protruding tip portion of the annular ridge 72 formed integrally with the outer peripheral surface of the support rod 64. Thereby, when the connecting rubber elastic bodies 74 and 74 are elastically deformed, the mass fitting 66 can be relatively displaced in the direction perpendicular to the axis with respect to the support rod 64. Specifically, as shown in FIG. 5 and FIG. 6, the protruding tip portion of the annular ridge 72 and the support rod 64 in a state where the mass fitting 66 and the support rod 64 are positioned on the same central axis. The gap dimension between δd is set to be 0 to 0.5 mm. Depending on the spring constants set for the connecting rubber elastic bodies 74, 74, the mass metal fitting 66 is displaced vertically downward from the central axis of the support rod 64 due to the action of gravity, so that the vertical upper side with respect to the support rod 64. It may be arranged in a state of being close to each other or in a state of being placed in contact.

  In the vibration damping device 62 having such a structure, when the support rod 64 is vibrated in a direction perpendicular to the axis, the connecting rubber elastic bodies 74 and 74 with the mounting cylinder portions 76 and 76 fixed to the support rod 64 are elastic. By being deformed, vibration energy is transmitted to the mass metal fitting 66 elastically connected to the support rod 64 by the connecting rubber elastic bodies 74, 74, and the mass metal fitting 66 is repeatedly oscillated and displaced with respect to the support rod 64 in a state of jumping. It is done. As a result, the mass metal fitting 66 is repeatedly abutted in the direction perpendicular to the support rod 64 via the annular protrusions 72, 72 formed integrally with the contact rubber layer 70. The same effect as that of the embodiment can be obtained.

  As mentioned above, although several embodiment of this invention has been explained in full detail, these are illustrations to the last, Comprising: This invention is not limited at all by the specific description in this embodiment. .

  For example, in the first embodiment, the axial end of the mass metal fitting 16 and the housing 12 are elastically connected by one connecting rubber elastic body (30). As shown, the axial end portion of the mass metal fitting 16 and the housing 12 are respectively connected to the housing 12 by a plurality of (three in the embodiment shown in FIGS. 7 and 8) connecting rubber elastic bodies 80, 80, 80. On the other hand, it may be elastically connected. In particular, in this embodiment, each of the connecting rubber elastic bodies 80, 80, 80 has a substantially constant circular cross section and a cylindrical shape extending in the axial direction, and has substantially the same spring characteristics in any direction perpendicular to the axis. Yes. Thereby, the mass frequency is constituted by the mass metal fitting 16, and the natural frequency of one vibration system in which the spring system is constituted by the plurality of connected rubber elastic bodies 80, 80, 80 is to be damped in the vibration member 32. It is possible to easily tune to the frequency range. In addition, by adopting such a mode, it is possible to set the force for suppressing the rotation of the mass metal fitting 16 around the central axis to be larger while setting the spring rigidity of each of the connecting rubber elastic bodies 80 to be small. In order to facilitate understanding, members and parts having the same structure as in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In the first embodiment, the connecting member is composed of the connecting rubber elastic bodies 30a and 30b formed of a rubber material. However, it is possible to adopt a connecting member formed of spring steel or the like. . In the first embodiment, each of the connecting members has a circular cross section that extends in the axial direction. However, the cross-sectional shape of the connecting member is not limited to a circular shape, but a rectangular shape or the like. The cross-sectional shape etc. which change to an axial direction may be sufficient.

  Furthermore, in the first embodiment, the mass metal fitting 16 has a solid columnar shape, but may have a hollow columnar shape or a cylindrical shape. In the first embodiment, it is also possible to adopt a solid or hollow spherical shape as the mass fitting 16.

  In the present invention, it is also possible to set the size of the gap between the elastic contact surfaces for the mass member and the vibration member to 0 mm. In particular, even when the gap size is set to 0 mm, the independent mass member is displaced with respect to the vibrating member by the elastic deformation of the elastic contact portion such as the contact rubber layer 54 due to the externally applied vibration force. Since the generation and disappearance of the gap between the striking surfaces in the elastic contact portion are repeated, the mass member substantially effectively strikes the vibration member. As a result, the above-mentioned counterbalance or positive vibration suppression effect is effectively exhibited. When the distance between the contact surfaces at the elastic contact portion is set to 0 mm, a slight compressive force is exerted on the elastic contact portion in consideration of dimensional errors in manufacturing the member. The independent mass member may be assembled to a vibration member such as a housing or a damping rod.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is sectional drawing which shows the damping device as 1st embodiment of this invention, Comprising: It is II sectional drawing in FIG. It is II-II sectional drawing in FIG. It is sectional drawing which shows the damping device as 2nd embodiment of this invention, Comprising: It is III-III sectional drawing in FIG. It is IV-IV sectional drawing in FIG. It is sectional drawing which shows the damping device as 3rd embodiment of this invention, Comprising: It is VV sectional drawing in FIG. It is VI-VI sectional drawing in FIG. In 1st embodiment, it is a figure which shows the other aspect for elastically connecting a mass metal fitting with respect to a housing with a connection rubber elastic body, Comprising: It is a VII-VII cross section in FIG. It is VIII-VIII sectional drawing in FIG.

Explanation of symbols

10 Damping device 16 Mass metal fitting 30a Linked rubber elastic body 30b Linked rubber elastic body

Claims (7)

The mass member is disposed so as to be relatively displaceable with respect to the vibration member, and the mass member is positioned opposite to the vibration member with a spherical or cylindrical contact surface. In the contact-type vibration damping device adapted to elastically contact the vibration member,
A connecting member for elastically connecting the mass member directly or indirectly to the vibrating member on both sides in the central axis direction of the mass member is provided, and while allowing displacement of the mass member in the direction perpendicular to the axis, A contact-type vibration damping device characterized by limiting rotational displacement about a central axis.   A contact member that is integrally or separately formed with respect to the vibration member and receives vibration to be damped is fixed to the vibration member, and the mass member is made a corresponding contact member by the connecting member. The contact-type vibration control device according to claim 1, wherein the contact-type vibration control device is elastically connected to the device.   The abutting member is formed of a rigid housing, an accommodation space is formed inside the housing, the mass member is accommodated in the accommodation space, and further, the mass member is attached to the housing by the connecting member. The contact-type vibration damping device according to claim 2, which is elastically connected to each other.   The abutting member is formed to include a damping rod that is fixedly extended from the vibrating member, while the mass member is cylindrical or annular, and the mass member is arranged on the damping rod. 3. The contact-type vibration damping device according to claim 2, wherein both ends of the mass member in the axial direction are elastically connected to the damping rod by the connecting members.   While the vibration member has a rod shape, the mass member is cylindrical or annular, and the mass member is extrapolated to the vibration member. The contact-type vibration damping device according to claim 1, wherein the vibration damping member is elastically connected to the vibration member.   Due to the elastic deformation of the connecting member, the mass member is subjected to the vibrational displacement of the mass member repeatedly elastically displaced against the vibrating member or the abutting member and elastically hits the mass member. The contact-type vibration damping device according to claim 1, which is tuned to a frequency range of a resonance frequency to be vibrated. The contact member and the mass member are both made of a rigid material having an elastic modulus of 5 × 10 ³ MPa or more, and a rubber elastic layer is formed on the contact surface of at least one of the contact member and the mass member. 7. The contact-type vibration damping device according to claim 2, wherein the mass member is elastically abutted against the corresponding contact member through the rubber elastic body layer.

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