JP3972297B2 - Vibration control device with foreign matter discharge function - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a vibration damping device that obtains an offset vibration damping effect by hitting an annular independent mass member extrapolated to a shaft member fixed to a vibration member.
[0002]
[Background]
Conventionally, as a method of reducing vibration in a member such as an automobile body in which vibration is a problem, (a) a mass damper in which a mass member is fixed to the vibrating member, or (b) a spring member is interposed in the vibrating member. In addition, a dynamic damper that connects and supports the mass material, and (c) a vibration damping material in which a sheet-like elastic material is attached to the surface of the vibration member are known. However, both the (a) mass damper and the (b) dynamic damper have a problem in that the frequency range where the effective damping effect is exhibited is narrow in addition to the necessity of a large mass material mass. . In addition, the above (c) damping material has a problem that a large sticking area is required and the weight increases. Furthermore, the above-mentioned (b) dynamic damper and (c) damping material have a problem that it is difficult to stably obtain the desired damping effect because the temperature dependence of the damping effect is high. .
[0003]
In view of such a conventional problem, the applicant of the present invention previously described in Patent Document 1 is an independent mass member that can be displaced relative to a rigid housing that is fixed to the vibration member with no gap therebetween. When the vibration is input, the independent mass member is brought into contact with the housing by an elastic contact surface, thereby canceling out the sliding friction at the time of contact and energy loss due to the collision. We proposed a new structure of a vehicle vibration control device that can achieve a good vibration control effect. In the vehicular vibration damping device having such a structure, an effective vibration damping effect can be obtained with respect to vibrations over a wide frequency range with a small mass.
[0004]
[Patent Document 1]
International Publication WO00 / 14429 Pamphlet
[0005]
However, in the vehicular vibration damping device described in Patent Document 1, it is necessary to form a housing that houses the independent mass member so as to cover the entire mass member, so that the structure is complicated and manufactured. In addition to being difficult, the outer size of the housing becomes large, and there is a problem that it is difficult to cope with the case where the installation space is particularly limited.
[0006]
Therefore, the present applicant has filed a new patent application (Japanese Patent Application No. 2001-037790), in which an independent annular mass member is extrapolated with respect to a shaft member fixed to the vibration member, and is independent without adhesion. A vibration damping device having an improved structure has been proposed in which the independent mass member is disposed so as to be displaceable so that the independent mass member is displaced relative to the shaft member directly and elastically. In such a vibration control device, since it is not necessary to provide a sealed housing that covers the independent mass member, the structure can be simplified and the manufacturing can be facilitated, and the outer size can be advantageously reduced. It becomes possible.
[0007]
However, the inventors have made further studies on the improved structure damping device disclosed in the above-mentioned prior application (Japanese Patent Application No. 2001-037790). It is possible to form the area where the members are arranged with a form that is open to the outside air without being sealed by the housing. The independent mass member may be directly exposed to foreign matters such as water, mud, dust, etc. depending on the conditions of the location, and such foreign matter has entered the gap between the contact surfaces of the independent mass member and the shaft member. A new problem that the contact condition of the independent mass member and the shaft member may change, and the desired vibration damping effect based on such a contact may not be stably exhibited. That is inherent revealed.
[0008]
[Solution]
Here, the present invention has been made in the background as described above, and the problem to be solved is a vibration damping device as described above that does not include a sealed type housing, and an independent mass member. The problem of reduced vibration control performance caused by foreign matter entering the gap between the contact surfaces of the shaft member and the shaft member can be avoided, and the desired vibration control effect can be stably obtained. An object of the present invention is to provide a vibration damping device having a structured structure.
[0009]
[Solution]
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.
[0010]
  That is, according to the first aspect of the present invention, an annular independent mass member is extrapolated from a shaft member fixed to the vibration member so as to be independently displaceable without adhesion, and the shaft member In the vibration damping device in which the independent mass member is relatively displaced and directly and elastically hits, in the axial perpendicular direction and the axial direction constituting the mutual contact surface of the independent mass member and the shaft member A foreign matter discharge portion is provided between at least one of the opposing surfaces so that foreign matter that has entered between the opposing surfaces can be easily discharged to the outside, and the foreign matter can be expelled to the outside.In addition, when the independent mass member is displaced relative to the shaft member in the direction perpendicular to the axis, the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member that are in contact with each other are used as the contact surface. A first discharge that penetrates in the axial direction while forming a first hitting surface and partially increasing the distance between the opposing surfaces in the direction perpendicular to the axis on which the first hitting surface is formed. A foreign matter that forms a foreign material passage and constitutes the foreign matter discharge portion by the first discharge passage and enters between the opposing surfaces in the direction perpendicular to the axis can be discharged outward in the axial direction through the first discharge passage. In this way, the shaft member and the independent mass member are attached to the vibrating member in a state where the central axes of the shaft member and the independent mass member extend in a substantially horizontal direction, while the relative displacement in the circumferential direction between the shaft member and the independent mass member. Provide circumferential displacement limiting means to limit Both the shaft member and the independent mass member have the first discharge passage formed in a part of the circumference on the surface perpendicular to the axis, and the first discharge passage is attached to the vibrating member. The passage is positioned at the vertical lower end of the surface perpendicular to the axis.This is a feature.
[0011]
In such an embodiment, even if the independent mass member is directly exposed to the external space, foreign matter such as water, mud, dust, etc. exerted from the external space is not separated from the gap between the contact surface of the independent mass member and the shaft member. In the case of entering and mixing, the discharge of such foreign matter to the external space can be promoted. Therefore, while ensuring sufficient excellent effects such as compactness of size and simplicity of structure that can be exhibited because it does not have a sealed housing, problems caused by intrusion of foreign matters from the external space are reduced or reduced. Can be avoided, and the intended vibration damping effect can be obtained effectively and stably.
[0012]
Further, in this aspect, the independent mass member can be entirely formed of a rubber elastic body, a synthetic resin material, or the like, or a rigid material such as a metal can be fixed for reinforcement. By using a rigid material having a high specific gravity such as a compact independent mass member having a large mass can be advantageously realized. Therefore, in the case where not only the independent mass member but also the shaft member is formed of a rigid material, an elastic material such as a rubber elastic body or a synthetic resin is attached to at least one of the contact surfaces of the independent mass member and the shaft member. Thereby, the elastic contact with the shaft member of the independent mass member can be advantageously realized.
[0013]
Furthermore, in this embodiment, since the independent mass member is non-adherent and can be independently displaced with respect to the shaft member, a member that elastically connects both members between the independent mass member and the shaft member. Also does not exist. In other words, the entire surface of the independent mass member is completely separated and independent from the shaft member. Under the state where the independent mass member is positioned at the movement center with respect to the shaft member, the inner peripheral surface of the independent mass member is the shaft. It is designed to be spaced apart in the direction perpendicular to the axis over the entire outer peripheral surface of the member.
[0015]
  AndIn this aspect, based on the abutting action of the shaft member and the independent mass member on the first striking surface, an effective damping effect against vibration in the direction perpendicular to the axis can be exhibited. Even if foreign matter enters between the opposing surfaces in the direction perpendicular to the axis constituting one hitting surface, such foreign matter can be guided axially outward through the first discharge passage and easily discharged into the external space. Thus, a reduction in the vibration damping effect due to the foreign matter remaining in the gap can be effectively prevented. In particular, the first discharge passage is formed between the opposed surfaces of the shaft member and the independent mass member that are displaced relative to each other when vibration is input, and the first discharge passage is caused by the relative displacement of the shaft member and the independent mass member. Since the cross-sectional shape of the discharge passage is changed and an external force (vibration force) is also exerted on the foreign matter guided to the first discharge passage, the foreign matter is quickly transferred from the first discharge passage. It can be discharged to the outside. In order to further increase the efficiency of discharging foreign matter through the first discharge passage, the axial taper (inclination) relative to the opposing surfaces of the shaft member and the independent mass member forming the first discharge passage is provided. Surface). In addition, since the first discharge passage is partially formed on the circumference in the surface perpendicular to the axis, the damping effect based on the contact of the independent mass member with the shaft member is the first It can be effectively exhibited by the portion where the discharge passage is not formed.
Further, in the present aspect, the first vibration damping device is mounted on the vibration member, and is positioned at the lower end in the vertical direction in the gap between the axially opposed surfaces and opens upward. The concave groove that constitutes the discharge passage is positioned. Therefore, the foreign matter that has entered between the opposed surfaces in the direction perpendicular to the axis can be guided toward the first discharge passage by the action of gravity, thereby more efficiently discharging the foreign matter to the external space and It can be realized quickly.
[0016]
In this aspect, the distance between the opposing surfaces in the direction perpendicular to the axis of the first striking surface is determined by disposing the independent mass member on the same central axis with respect to the shaft member, and the outer peripheral surface of the shaft member and the independent mass. It shall be defined with the dimension measured under the condition that the inner peripheral surface of the member is positioned on the same central axis.
[0018]
  In addition, the first of the present inventiontwoThe aspect of the aboveOneIn the vibration damping device according to the aspect, both the shaft member and the independent mass member are formed of a metal material, and at least one of the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member is covered with a rubber elastic body. And forming at least one of the shaft member and the opposed surface in the direction perpendicular to the axis of the independent mass member with the rubber elastic body, and in the rubber elastic body, the outer peripheral surface of the shaft member and the independent mass member Elastic protrusions protruding from one of the inner peripheral surfaces of the inner peripheral surface to the other are integrally formed so as to extend in the circumferential direction at a plurality of locations in the axial direction, and the first protruding surface of the elastic protrusions A hitting surface is formed. In this embodiment, since the first hitting surface is partially formed on the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member, the first hitting surface is formed over the entire surface. Compared to the case where the surface is formed, the foreign object can be prevented from being caught in the first contact surface, and the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member enter between the opposing surfaces in the direction perpendicular to the axis. The foreign matter is also guided more quickly toward the first discharge passage in the circumferential direction through a relatively large gap provided in the portion where the elastic protrusion is not formed, and through the first discharge passage. The efficiency of discharging the foreign matter into the external space can be improved.
[0020]
  In addition, the first of the present inventionthreeIn this aspect, an annular independent mass member is extrapolated with respect to a shaft member fixed to the vibration member so that it can be independently displaced without adhesion, and the independent mass member is relatively displaced with respect to the shaft member. In the vibration damping device that directly and elastically strikes, between the at least one of the perpendicular direction and the axial direction constituting the mutual contact surface of the independent mass member and the shaft member. A foreign matter discharge portion that can facilitate the discharge of foreign matter that has entered between the opposing surfaces to the outside, and the independent mass member with respect to the shaft member. A first abutting surface as the abutting surface is constituted by the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member that abut against each other by being relatively displaced in a direction perpendicular to the axis, and the first abutting surface Configure the hitting surface On the inner peripheral surface of the independent mass member, an axially inclined surface is formed which gradually expands from the axial intermediate portion toward both axial end portions and is spaced radially outward from the outer peripheral surface of the shaft member. The shaft member and the shaft member are configured such that the foreign matter intruding between the opposing surfaces in the direction perpendicular to the axis is configured by the inclined surface in the axial direction, and the foreign material that is introduced between the opposing surfaces in the direction perpendicular to the axis The independent mass member is attached to the vibration member in a state where each central axis extends in a substantially horizontal direction.
[0021]
  In this embodiment, an effective damping effect against vibration in the direction perpendicular to the axis can be exhibited based on the contact action between the shaft member and the independent mass member on the first hitting surface. Even when foreign matter enters between the axially perpendicular facing surfaces constituting the first contact surface, the foreign matter is guided along the axially inclined surface forming the gap, so that Therefore, it is possible to effectively prevent the reduction of the vibration damping effect due to the foreign matter remaining in the gap. In particular, the axially inclined surface is formed on an independent mass member that is displaced relative to the shaft member when a vibration is input, and the foreign material on the axially inclined surface is caused by the displacement of the independent mass member relative to the axial member. On the other hand, since an external force (excitation force) can be exerted, the foreign matter can be more efficiently guided by the axially inclined surface and quickly discharged to the external space.
Further, in this aspect, with the vibration damping device attached to the vibration member, the foreign matter that has entered between the opposed surfaces in the direction perpendicular to the axis is guided downward in the circumferential direction by the action of gravity, and the vertical direction of the gap In addition, the vertical lower end portion is placed on the axially inclined surface formed on the inner peripheral surface of the independent mass member by the action of gravity. Therefore, the guide action of the foreign matter in the axial direction by the inclined surface in the axial direction can be more effectively exhibited by the gravitational force exerted on the foreign matter, and the discharge of the foreign matter to the external space is more efficient and It can be realized quickly.
[0022]
  In addition, the first of the present inventionFourThe aspect of the abovethreeIn the vibration damping device according to the above aspect, the shaft member and the independent mass member are both formed of a metal material, and a rubber elastic body is formed on the inner peripheral surface of the independent mass member, thereby the rubber elastic body. In the independent mass member, the axially perpendicular surface provided with the axially inclined surface is configured. In this embodiment, the strength of the shaft member and the independent mass member and the mass of the independent mass member can be easily ensured, and at the time of molding the rubber elastic body constituting the first striking surface, It is possible to easily form the inclined surface in the axial direction with any inclination angle and surface shape.
[0024]
  In addition, the first of the present inventionFiveThe first to the second aspectsFourIn the vibration damping device according to any one of the above, a pair of axial contact portions that are positioned on both sides of the independent mass member in the axial direction and extend in a direction perpendicular to the axial direction are fixedly provided to the axial member. The independent mass member is relatively displaced in the axial direction with respect to the shaft member, and the second abutting surface is formed by the axial contact portion that abuts each other and the axial end surface of the independent mass member. A hitting surface is formed. In such a vibration damping device according to this aspect, in addition to being capable of exhibiting a vibration damping effect against vibration in a direction perpendicular to the axis based on the abutting action of the independent mass member on the shaft member against the shaft member. Thus, an effective damping effect can be exerted even in the axial direction based on the contact action of the independent mass member with the second abutting surface against the shaft member.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0034]
1 to 2 show a vibration damping device 10 as a first embodiment of the present invention. The vibration damping device 10 is configured by assembling an annular mass 14 as an independent mass member in an extrapolated state with respect to a support rod 12 as a shaft member, and the support rod 12 is configured to control a vehicle body or the like. It is attached by being fixed to the vibration member 16 to be shaken. In the following description, the vertical direction means the vertical direction in FIGS. 1 and 2 corresponding to the vertical vertical direction.
[0035]
More specifically, the support rod 12 has a solid circular rod shape, and a large-diameter head 18 is integrally formed at one end in the axial direction, while the other end in the axial direction is formed. A bolt portion 20 that protrudes outward in the axial direction is integrally formed. An annular plate-shaped retaining plate 22 is externally fitted and fixed to the head portion 18, while a bracket plate 24 is extrapolated to the bolt portion 20 and screwed to the bolt portion 20. The retaining plate 22 and the bracket plate 24 are opposed to each other at a predetermined distance in the axial direction of the support rod 12.
[0036]
The support rod 12, the retaining plate 22, and the bracket plate 24 are all formed of a material having rigidity sufficient for an external force exerted by vibration input, for example, a metal such as iron. Yes.
[0037]
Further, the retaining plate 22 is provided with an arcuate engagement window 26 extending in the thickness direction around the central axis and extending in a circumferential direction by a predetermined length. Furthermore, the bracket plate 24 has a substantially rectangular flat plate shape, and a lower end edge portion is bent in the horizontal direction, and a fixed plate portion 28 is integrally formed. In the fixed plate portion 28, the surface of the vibration member 16 is formed. Are fixed to the vibration member 16 with fixing bolts 30.
[0038]
  On the other hand, the annular mass 14 has a rubber elastic body 34 on the surface of the annular mass fitting 32.CoveredThe structure is formed by wearing. The mass fitting 32 has a thick cylindrical shape with a rectangular cross-sectional shape extending in the circumferential direction, and its inner diameter is sufficiently larger than the outer dimension of the support rod 12, and the outer dimension is The outer dimensions of the stop plate 22 are substantially the same. For the mass metal fitting 32, it is desirable to select a material that is inexpensive, easy to mold, and has a large mass. For example, iron-based metal is advantageously employed.
[0039]
Further, the rubber elastic body 34 is attached to the outer peripheral surface of the mass metal fitting 32, and has a thin covering rubber layer 36 covering substantially the entire outer peripheral surface of the mass metal fitting 32, and both axial ends of the mass metal fitting 32. A pair of abutting rubber portions 38, 38 that incline outward in the axial direction and protrude inward in the radial direction, and an engagement protrusion 40 that protrudes outward in the axial direction from one axial end surface of the mass fitting 32. It is configured. The rubber elastic body 34 including the covering rubber layer 36, the contact rubber portions 38, 38 and the engagement protrusion 40 is integrally formed on the outer peripheral surface of the mass fitting 32 and vulcanized and bonded to the mass fitting 32. ing.
[0040]
In this case, each of the contact rubber portions 38, 38 has a tapered cylindrical shape that gradually decreases in diameter toward the outside in the axial direction, but is not continuous over the entire circumference of the mass fitting 32, It is formed with a length slightly larger than a half circumference in the circumferential direction. Further, the contact inner peripheral surfaces 42, 42 having a small-diameter arc shape are formed by the inner peripheral surfaces of the protruding tip portions of the pair of contact rubber portions 38, 38, and these contact inner peripheral surfaces 42, 42 are formed. Further, it is positioned radially inward from the inner peripheral surface of the covering rubber layer 36.
[0041]
The engagement protrusion 40 has an arc plate shape extending in the circumferential direction by a predetermined length, and is positioned on the outer peripheral side of the contact rubber part 38 at the same position on the circumference as the contact rubber part 38. Thus, it protrudes outward in the axial direction from the corresponding rubber contact portion 38.
[0042]
Such an annular mass 14 is attached to the support rod 12 by extrapolation before the bracket plate 24 is assembled. Further, under such an assembled state, the engagement projection 40 of the annular mass 14 is inserted in a loosely inserted state with respect to the engagement window 26 of the retaining plate 22, and the engagement window 26 of the engagement projection 40. Due to the engaging action, the annular mass 14 is positioned in the circumferential direction with respect to the retaining plate 22 and thus the support rod 12.
[0043]
As a result, the annular mass 14 that is externally attached to the support rod 12 that is disposed with the central axis extending in the horizontal direction by the bracket plate 24 that is bolted to the vibration member 16 is formed into a pair of contact rubbers. The portions 38 and 38 are positioned in the circumferential direction with the portions 38 and 38 positioned vertically upward, and the contact inner peripheral surfaces 42 and 42 of the pair of contact rubber portions 38 and 38 abut against the outer peripheral surface of the support rod 12. By being brought into contact with each other, it is supported in a suspended state. In short, in the present embodiment, the first striking surface is constituted by the outer peripheral surface of the support rod 12 and the contact inner peripheral surfaces 42, 42 of the pair of contact rubber portions 38, 38 brought into contact therewith. It is.
[0044]
Under such a mounting state, the axial intermediate portion of the mass fitting 32 continuously extends in the circumferential direction between the support rod 12 and the radially opposed surfaces (axially opposed surfaces) 44 and 46 of the mass fitting 32. A void 48 is formed. In addition, since the inner diameter dimension of the mass metal fitting 32 is sufficiently larger than the outer diameter dimension of the support rod 12, the radial direction of the cavity 48 can be obtained in a state where the mass metal fitting 32 is suspended and supported by the support rod 12. The dimensions are changed in the circumferential direction, and the void 48 is narrow in the vertical direction and wide in the vertical direction. In addition, at the vertical lower end portion where the radial dimension of the void 48 is maximized, the contact rubber portions (38, 38) are not formed at both axial end portions of the annular mass 14, whereby the void 48 is opened and communicated with the external space directly on both sides in the axial direction. That is, the pair of abutting rubber portions 38, 38 constituting the rubber elastic body 34 includes notches 50, 50 having a width less than a half circumference in the circumferential direction at a portion positioned at the lower end in the vertical direction of the annular mass 14. The groove is formed in cooperation with the notches 50 and 50 and the space 48 so that the distance between the radially opposing surfaces of the support rod 12 and the annular mass 14 is increased and extends in the axial direction. A first discharge passage 52 having a shape is formed.
[0045]
Therefore, in the vibration damping device 10 having such a structure, when vertical vibration is applied from the vibration member 16 to the support rod 12, vibration energy is applied to the annular mass 14 extrapolated to the support rod 12. As a result, the annular mass 14 jumps and displaces in the direction perpendicular to the axis (vertical direction), and the annular mass 14 strikes the outer peripheral surface of the support rod 12 at its abutting inner peripheral surface 42. Based on the hitting, an offset damping effect can be exhibited with respect to the support rod 12 and thus the vibration member 16.
[0046]
Therefore, in the vibration damping device 10, the void 48 formed between the radially opposed surfaces 44 and 46 constituting the contact surface perpendicular to the axial direction of the annular mass 14 and the support rod 12 is annular in the mounted state. When the mass 14 is suspended downward by gravity, the vertical lower end portion is set to be large, and the vertical lower end portion is provided with notches 50, 50 in the contact rubber portions 38, 38. Thus, a first discharge passage 52 that penetrates in the axial direction and opens to the external space is formed. Therefore, for example, when the vibration damping device 10 is attached, foreign matters such as water and mud Even when it enters between the radially opposed surfaces 44 and 46, it is moved downward by the action of gravity through the void 48 and guided to the vertical lower end, and then quickly discharged into the external space through the first discharge passage 52. Because it can be That.
[0047]
Accordingly, foreign matter such as water and mud stays between the radially opposing surfaces 44 and 46 constituting the contact surface perpendicular to the axial direction of the annular mass 14 and the support rod 12, and the outer peripheral surface of the support rod 12 and the annular mass 14. It is possible to prevent the vibration damping effect from continuing to enter between the abutting surfaces of the abutting inner peripheral surfaces 44, 44, and the desired vibration damping based on the abutting of the annular mass 14 on the support rod 12. The effect can be stably and effectively exhibited.
[0048]
In addition, in the vibration damping device 10 having the structure as described above, the structure in which the annular mass 14 is directly exposed to the external space can be maintained, so that the overall structure is simple and easy to manufacture, The effect that the overall size can be made compact can also be exhibited effectively.
[0049]
In particular, in the present embodiment, the elastic contact portion between the support rod 12 and the annular mass 14 is constituted by a pair of contact rubber portions 38 and 38 protruding obliquely outward in the axial direction from the annular mass 14. Since the abutment rubber portions 38 and 38 are elastically deformed with a shear component when abutting in the direction perpendicular to the axis, the spring characteristic of the abutment portion with respect to the support rod of the annular mass 14 is set to a low spring characteristic. There is also an advantage that it is easy to tune the peak of the damping characteristic to a low frequency range.
[0056]
  Also figure3In the present invention,twoA vibration damping device 70 as an embodiment is shown. In the vibration damping device 70, an annular mass 74 as an independent mass member is assembled to a fixing bracket 72 as a shaft member so as to be relatively displaceable.4When the annular mass 74 hits the fixing bracket 72 under the mounting state on the vibration member 75 as shown in FIG.
[0057]
More specifically, the fixing fitting 72 has a structure in which a plate fitting 78 is fixed to an end portion of the cylindrical fitting 76 in the axial direction. The tube fitting 76 has a flange portion 82 integrally formed at one axial end portion of a cylindrical tube portion 80, and has an annular shape continuously extending in the circumferential direction with an L-shaped cross section. On the other hand, the metal plate 78 has an annular plate shape having an insertion hole 80 in the center portion, and is axial with respect to the other axial end of the tube metal 76 (the axial end opposite to the flange portion 82). It is overlapped and fixed in the direction. As a result, the flange portion 82 and the plate fitting 78 are located on both sides of the tube portion 80 of the tube fitting 76 in the axial direction, spread outward in the direction perpendicular to the axis, and have a predetermined distance in the axial direction. The fixing bracket 72 is formed in the form of an annular groove that opens outward in the radial direction and extends continuously in the circumferential direction as a whole.
[0058]
On the other hand, the annular mass 74 has a structure in which a rubber elastic body 86 is attached to an annular block-shaped mass fitting 84 that continuously extends in the circumferential direction with a rectangular cross section. In particular, the rubber elastic body 86 is formed in the form of a rubber layer that covers substantially the entire surface of the mass fitting 84, and is preferably vulcanized and bonded to the mass fitting 84. The annular mass 74 has a minimum inner diameter dimension that is larger than the outer diameter dimension of the cylindrical fitting 76 of the fixing bracket 72 by a predetermined amount, and has a maximum axial dimension that is the same as that of the flange portion 82 of the fixing bracket 72. The distance between the opposing surfaces in the axial direction of the metal plate 78 is made smaller by a predetermined amount.
[0059]
The annular mass 74 is externally inserted into the cylindrical portion 80 of the fixing bracket 72 and is disposed between the axially facing surfaces of the flange portion 82 and the plate bracket 78, and an annular groove formed in the fixing bracket 72. It is assembled in the state accommodated in the. Further, under such an assembled state, the annular mass 74 can be relatively displaced with respect to the fixture 72 independently by a predetermined distance in the direction perpendicular to the axis and in the axial direction. In short, when the annular mass 74 is positioned on the same central axis with respect to the fixing bracket 72 and at the central portion in the axial direction, the annular mass 74 is fixed between the annular mass 74 and the fixing bracket 72 over the entire circumferential direction. A predetermined amount of gap is formed so that the annular mass 74 can be relatively displaced with respect to the fixture 72 independently.
[0060]
Thereby, the fixing member 72 and the annular mass 74 are opposed to each other in the radial direction by being opposed to each other in the radial direction by the outer peripheral surface of the cylindrical portion 80 and the inner peripheral surface of the annular mass 74 of the fixing member 72. , 90, and a pair of axial directions that are opposed to each other in the axial direction by the inner surfaces of the flange portion 82 and the plate metal 78 of the fixing metal 72 and the axially opposite end surfaces of the annular mass 74 and abut against each other. Opposing surfaces 92 and 94 are formed.
[0061]
In addition, the rubber elastic body 86 is attached to the inner peripheral surface of the mass metal fitting 84, and the thickness dimension of the portion forming the radial facing surface 90 is changed in the axial direction, so that the cylindrical mass is formed. The protruding height of the rubber elastic body 86 from the inner peripheral surface of the metal fitting 84 is different in the axial direction. Specifically, the protruding height of the rubber elastic body 86 from the inner peripheral surface of the mass metal fitting 84 is the largest at the central portion in the axial direction, and gradually becomes smaller from there toward the both sides in the axial direction. As a result, the diameter of the annular mass 74 formed by the rubber elastic body 86 is the smallest in the central portion with respect to the radially facing surface 88 (inner circumferential surface of the annular mass 74), and gradually expands from there to both sides in the axial direction. The taper which is diameter is attached.
[0062]
Furthermore, the rubber elastic body 86 is provided with elastic protrusions protruding outward in the axial direction at the radial intermediate portion in the portions that are attached to both end surfaces in the axial direction of the mass fitting 84 to form the axially facing surfaces 94, 94. 96 and 96 are integrally formed with the protrusion form extended in the circumferential direction.
[0063]
  Thus, the vibration damping device 70 having the above-described structure is shown in FIG.4As shown in FIG. 5, when the fixing bolt 98 is externally inserted into the fixing bolt 98 and screwed into the vibration member 75, the fixing metal 72 is attached to the vibration member 75 and the head 100 of the fixing bolt 98. It is attached by being fastened between and fixed to the vibration member 75. Further, under such a mounted state, the central axis of the fixing bracket 72 is extended in a substantially horizontal direction.
[0064]
  Thus, in such a mounted state,4As shown in FIG. 6, as in the first embodiment, the annular mass 74 externally attached to the fixing bracket 72 is suspended by the fixing bracket 72 fixed to the vibration member 75. It will be suspended and supported. When vibration in the vertical direction is applied, vibration energy is transmitted from the fixing bracket 72 to the annular mass 74, and the annular mass 74 is relatively displaced in a jumping state in the vertical direction with respect to the fixing bracket 72, and as a result. The annular mass 74 is repeatedly abutted between the radially opposed surfaces 88 and 90 with respect to the fixing bracket 72, and an offset damping effect can be exerted on the vibration member 75. In addition, a horizontal direction corresponding to the central axis direction with respect to the vibration damping device 70 (see FIG.4When vibration in the right and left direction is exerted, vibration energy is transmitted from the fixing bracket 72 to the annular mass 74, and the annular mass 74 is displaced relative to the fixing bracket 72 in the axial direction. As a result, the annular mass 74 is repeatedly abutted between the axially facing surfaces 92 and 94 on both sides in the axial direction with respect to the fixture 72, and an offset vibration damping effect can be exerted on the vibration member 75.
[0065]
  Here, in the vibration damping device 70, since the radial facing surface 90 constituting the radial contact surface of the annular mass 14 with respect to the fixing bracket 72 is an inclined surface inclined in the axial direction, Figure4As shown in FIG. 4, in the state where the annular mass 14 is suspended and attached by the fixing bracket 72 by gravity, the radial facing surfaces 88 of the cylindrical portion 80 of the annular mass 14 and the fixing bracket 72 are mounted. , 90 is made large at the lower end, and a first discharge passage 102 that penetrates in the axial direction and opens to the external space is formed. In addition, the bottom surface of the first discharge passage 102 is configured by the inner peripheral surface (radially opposed surface) 90 of the annular mass 74 and is tapered in a radial direction. Therefore, for example, even when a foreign substance such as water or mud enters between the radially opposed surfaces 88 and 90 under the mounted state of the vibration damping device 10, the opposed surface of the cylindrical portion 80 of the fixing bracket 72 and the annular mass 74. It is moved downward by the action of gravity through the space formed between them and guided to the vertical lower end, and then through the first discharge passage 102, with a taper formed on the bottom surface of the first discharge passage 102. It can be quickly discharged to the external space as it is sent out in the axially outward direction.
[0066]
Accordingly, in the vibration damping device 70 of the present embodiment as well, in the same way as in the first embodiment, foreign matters such as water and mud are opposed to each other in the radial direction that forms the axially perpendicular contact surfaces of the annular mass 74 and the fixing bracket 72. It is possible to prevent staying between the surfaces 88 and 90 and entering the space between the radial contact surfaces of the fixing bracket 72 and the annular mass 74 and continuing to inhibit the damping effect. The desired damping effect based on the contact can be stably and effectively exhibited.
[0067]
As is clear from the above description, in the present embodiment, the annular mass 74 is suspended and supported by the fixing bracket 72, so that the annular mass 74 and the fixing bracket 72 are disposed between the radially facing surfaces 88 and 90. The contact surface of the annular mass 74 against the fixing bracket 72 is formed by the first discharge passage 102 formed and the tapered structure of the inner peripheral surface of the annular mass 74 that further promotes the discharge of foreign matter from the discharge passage 102. A foreign matter discharge portion that promotes the discharge of foreign matter that has entered between them is configured in cooperation.
[0078]
Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention is not construed as being limited by specific descriptions in such embodiments, and those skilled in the art The present invention can be carried out in a mode in which various changes, corrections, improvements, etc. are added based on the knowledge of the above, and any such embodiment does not depart from the gist of the present invention. It should be understood that it is included within.
[0079]
【The invention's effect】
As is clear from the above description, the vibration damping device having the structure according to the present invention has a foreign matter discharging function, so that foreign matters such as water exerted from the external space can be applied between the independent mass member and the shaft member. Even in the case of entering the gap between the contact surfaces, the discharge of such foreign matter into the external space is promoted, and therefore, problems caused by the entry of foreign matter from the external space are reduced or avoided. The vibration damping effect can be effectively and stably exhibited.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a vibration damping device as a first embodiment of the present invention.
FIG. 2 is a right side view in FIG.
[Figure3] Of the present inventiontwoIt is a longitudinal cross-sectional view which shows the vibration damping device as embodiment of this.
[Figure4] Figure3It is a longitudinal cross-sectional explanatory drawing which shows the mounting state of the vibration damping device shown by 2.
[Explanation of symbols]
10 Vibration control device
12 Support rod
14 annular mass
16 Vibration member
32 mass brackets
34 Rubber elastic body
36 Coated rubber layer
38 Contact rubber part
40 Engagement protrusion
42 Contact inner peripheral surface
44 Radial facing surface
46 Radial facing surface
48 voids
52 First exhaust passageRoad
70 Damping device
72 Fixing bracket
74 annular mass
75 Vibration member
76 Tube fitting
78 metal plate
84 Mass bracket
86 Rubber elastic body
88 Radial facing surface
90 Radial facing surface
92 Axial facing surface
94 Axial facing surface
102 First exhaust passageRoad

Claims (5)

An annular independent mass member is extrapolated from the shaft member fixed to the vibration member so as to be displaceable independently without adhesion, and the independent mass member is directly displaced relative to the shaft member. And in the vibration damping device designed to hit elastically,
The foreign matter that has entered between the opposing surfaces is easily discharged to the outside between at least one of the opposing surfaces in the direction perpendicular to the axis and the axial direction constituting the mutual contact surface of the independent mass member and the shaft member. And providing a foreign matter discharge portion that can promote the discharge of the foreign matter to the outside, and
When the independent mass member is displaced relative to the shaft member in a direction perpendicular to the axis, the outer peripheral surface of the shaft member abuts against each other and the inner peripheral surface of the independent mass member as the first contact surface. In addition to forming a contact surface, a distance between the opposing surfaces perpendicular to the axis on which the first contact surface is formed is partially increased on the circumference to form a first discharge passage that penetrates in the axial direction. The foreign matter that has formed the foreign matter discharge portion by the first discharge passage and has entered between the opposed surfaces in the direction perpendicular to the axis can be discharged outward in the axial direction through the first discharge passage,
The shaft member and the independent mass member are attached to the vibration member in a state where the central axes extend in a substantially horizontal direction, and the circumferential member restricts the relative displacement in the circumferential direction of the shaft member and the independent mass member. In addition to providing a direction displacement limiting means, the first discharge passage is formed in a part of the circumference of the shaft member and the independent mass member on the surface perpendicular to the axis, and the first discharge passage is mounted on the vibration member. A vibration damping device having a foreign matter discharge function, wherein the first discharge passage is positioned at a vertical lower end portion of the surface perpendicular to the axis. The shaft member and the independent mass member are both made of a metal material, and a rubber elastic body is formed on at least one of the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member, and the rubber elasticity The shaft member and at least one of the opposed surfaces in the direction perpendicular to the axis of the independent mass member, and in the rubber elastic body, one of the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member is the other. An elastic projecting portion projecting toward the surface is integrally formed so as to extend in the circumferential direction at a plurality of locations in the axial direction, and the first hitting surface is configured by a projecting tip surface of the elastic projecting portion. A vibration damping device having a foreign matter discharging function according to 1 . An annular independent mass member is extrapolated from the shaft member fixed to the vibration member so as to be displaceable independently without adhesion, and the independent mass member is directly displaced relative to the shaft member. And in the vibration damping device designed to hit elastically,
The foreign matter that has entered between the opposing surfaces is easily discharged to the outside between at least one of the opposing surfaces in the direction perpendicular to the axis and the axial direction constituting the mutual contact surface of the independent mass member and the shaft member. And providing a foreign matter discharge portion that can promote the discharge of the foreign matter to the outside, and
When the independent mass member is displaced relative to the shaft member in a direction perpendicular to the axis, the outer peripheral surface of the shaft member and the inner peripheral surface of the independent mass member which are abutted with each other serve as a first striking surface. The outer peripheral surface of the shaft member that forms a contact surface and gradually expands from the axially intermediate portion toward both axial end portions on the inner peripheral surface of the independent mass member that forms the first contact surface An axially inclined surface that is spaced radially outward from the outer surface is formed, and the foreign material that has entered the foreign material discharge portion by the axially inclined surface and has entered between the opposing surfaces in the direction perpendicular to the axis is guided by the axially inclined surface. So that it can be discharged axially outward,
A vibration damping device having a foreign matter discharging function, wherein the shaft member and the independent mass member are attached to the vibration member in a state in which respective central axes extend in a substantially horizontal direction. The shaft member and the independent mass member are both formed of a metal material, and a rubber elastic body is formed on the inner peripheral surface of the independent mass member, and the axial direction of the independent mass member is formed by the rubber elastic body. The vibration damping device having a foreign matter discharging function according to claim 3 , wherein the axis-perpendicular surface is provided with an inclined surface. A pair of axial contact portions that are positioned on both sides of the independent mass member in the axial direction and extend in a direction perpendicular to the axis are fixedly provided to the shaft member, and the independent mass member is provided to the shaft member. It said axial abutment and said independent mass member by the axial end face as the strike contact surface of the second beat per surface claims 1 to 4 constitute the strikes each other by but is caused to relative displacement in the axial direction A vibration damping device having a foreign matter discharging function according to any one of the above.

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