JP2007064353A - Swing damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new swing damping device capable of providing effective spring components and damping components without increasing the size of the damping device and realizing excellent durability. <P>SOLUTION: A support arm 14 is swingably installed on a member 12 to be damped. A mass part 16 is installed on the support arm 14. A connection rubber 42 elastically and swingably supporting the support arm 14 is disposed on the mass part 16 at a position nearer a swing center axis 24 than the gravity center of the mass part 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration damping device that can exhibit an effective vibration damping effect by configuring a secondary vibration system for a vibration damping target member, and in particular, to obtain a vibration damping effect based on a rocking displacement of a mass member. The present invention relates to an oscillating vibration damping device.

  2. Description of the Related Art Conventionally, a swing type or pendulum type vibration control device is known as a type of a vibration control device that is employed in a vibration control target member in which vibration is a problem, such as a car body of an automobile. For example, it is shown in FIG. 11, FIG. 12, etc. of patent document 1 (Unexamined-Japanese-Patent No. 2004-301267).

  Such a swing type vibration damping device generally has a structure in which a support arm is elastically supported so as to be swingable and displaceable with respect to a vibration target member, and a mass portion is provided on the support arm. A mass-spring system composed of a support spring that elastically supports the support arm so as to be swingable and a mass portion provided on the support arm functions as a sub-vibration system for the member to be controlled. ing. Thus, by adjusting the spring constant of the support spring and the mass of the mass portion according to the vibration to be damped, the natural frequency of the sub-vibration system is tuned to the vibration to be damped. The damping effect is exhibited against the vibrations that occur.

  By the way, in the swing type vibration damping device having the conventional structure as shown in FIG. 11 and FIG. 12 of the above-mentioned Patent Document 1, a cylindrical rubber is disposed at the swing center of the support arm. While the outer peripheral surface is fixed to the member to be damped, the support arm is fixed to the inner peripheral surface of the cylindrical rubber. That is, the support spring that elastically supports the support arm so as to be able to swing and displace is constituted by such a cylindrical rubber.

  However, in such a swing type vibration damping device having a conventional structure, the tuning range of the spring characteristics of the support spring is narrow, and it may be difficult to obtain an effective vibration damping effect. Since the supporting spring that is covered and made of cylindrical rubber exhibits its spring characteristics exclusively by torsional elasticity, it is difficult to obtain a large spring constant. In addition, in order to obtain an effective damping effect when the vibration mass of the vibration suppression target member is large, it is necessary to set the mass of the mass portion to be large, but in order to avoid the change in the tuning frequency associated therewith, the spring constant As a result, it is necessary to increase the size of the cylindrical rubber. In addition, it is difficult to limit the amount of torsional deformation of the cylindrical rubber, so when a large vibration load is input, the amount of elastic deformation of the cylindrical rubber becomes excessive and easily damaged, and good durability There was also a problem that it was difficult to obtain.

  Patent Document 1 also discloses a structure in which a compression / tension spring is mounted between a tip portion of a support arm and a vibration suppression target member, and the support spring is configured by this spring.

  However, when a support spring is provided between the tip of the support arm and the member to be damped, there is no problem when a metal coil spring as described in Patent Document 1 is used as the support spring. When an elastic body is used, there is a problem in that it is difficult to ensure sufficient durability because the amount of bending becomes too large. In addition, if a support spring is provided at the tip of the support arm where the displacement distance during swinging is the largest, a large amount of deformation is required for the support spring, while the spring stiffness acts as a moment around the swing center axis of the support arm. Therefore, it is necessary to sufficiently lower the support spring. Therefore, it is necessary to increase the volume of the support spring, and in combination with the fact that the tip of the support arm needs to protrude further from the mass part, the size of the swing type vibration isolator further increases. There is also. In addition, even when the support spring is provided at the tip of the support arm in this way, excessive swinging displacement in the support arm cannot be prevented, so that excessive elastic deformation is caused in the support spring. There was a risk of damage to the support spring, and it was difficult to ensure sufficient durability.

JP 2004-301267 A

  Here, the present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the support arm can be elastically swung without increasing the overall size of the apparatus. The support spring is supported by a rubber elastic body, and in particular, it has a new structure that can realize a great degree of freedom regarding the tuning of the spring characteristics of the support spring and can realize excellent durability. The object is to provide a vibration damping device.

  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. Further, 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 an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

(First embodiment of the present invention)
That is, according to the first aspect of the present invention, the support arm is supported so as to be swingable and displaceable about the swing center axis with respect to the member to be controlled, and the support arm is placed at a position off the swing center axis. A oscillating type vibration damping device that has a mass portion having a center of gravity and that exerts a damping effect on the member to be damped based on an elastic oscillating displacement about the oscillating center axis of the support arm. In the apparatus, the support arm is elastic with respect to the vibration control target member at a position off the swing center axis of the support arm and at a position closer to the swing center axis than the center of gravity of the mass portion. The connecting arm is provided with a connecting rubber, and the supporting arm is supported by the connecting rubber so as to be swingable elastically around the swing center axis.

  In such a swing type vibration damping device structured according to this aspect, the support arm is placed at a specific position that is away from the swing center axis of the support arm and closer to the swing center axis than the center of gravity of the mass portion. By providing elastic support with the connecting rubber, an unprecedented effective elastic support structure is realized. In other words, the connecting rubber disposed at the specific position is not subjected to a heavy load in the torsional direction unlike the conventional structure in which the connecting rubber is disposed on the oscillation center axis, and the connecting rubber is provided at the tip of the support arm. The amount of deformation does not become excessive at the time of rocking displacement as in the conventional structure to which is attached.

  Therefore, it is possible to advantageously realize a suitable coupling spring characteristic required in the swing type vibration damping device, and a large degree of freedom in setting the spring characteristic can be secured, and the durability of the coupling rubber can be advantageously secured. is there. Moreover, since it is not necessary to increase the size of the connecting rubber so much when tuning the spring characteristics and ensuring the durability of the connecting rubber, it is possible to reduce the overall size of the oscillating vibration damping device.

  In this embodiment, the swing center axis represents the center of the swing motion of the support arm, and it is not always necessary to have an entity such as a shaft member.

(Second embodiment of the present invention)
According to a second aspect of the present invention, in the swing type vibration damping device according to the first aspect, the support arm has a longitudinal rod shape, and one end portion in the longitudinal direction thereof is the vibration damping device. In addition to being attached to the target member so as to be able to swing and displace, the mass portion is provided at the other end, and the intermediate portion in the longitudinal direction of the support arm is supported by the connecting rubber. It is characterized in that it is elastically connected to the vibration suppression target member.

  In this aspect, since the connecting rubber is disposed between the rocking central shaft and the mass portion on the support arm, the overall size can be reduced more advantageously. Further, the length dimension of the support arm can be reduced to the minimum necessary for connecting the oscillation central axis and the mass portion.

(Third embodiment of the present invention)
According to a third aspect of the present invention, in the swing type vibration damping device according to the first or second aspect, a stopper that faces the support arm at a predetermined distance in the swing direction. When the support arm is oscillated and displaced more than a certain amount by providing a cushioning rubber on the opposing surface in the swinging direction of the support arm and the stopper, A stopper mechanism for buffering the amount of swinging displacement of the support arm by contacting the stopper portion via a stopper is provided.

  In the swing type vibration damping device of the present aspect, the support arm is excessively large without any adverse effect on the elastic support characteristics of the connecting rubber when the support arm swings within a predetermined swing range. Can be limited in a buffering manner. Therefore, it is possible to prevent excessive stress and strain from being generated in the connecting rubber and further improve the durability. In addition, problems such as interference with other members due to excessive displacement of the support arm and the mass portion can be avoided.

(Fourth aspect of the present invention)
According to a fourth aspect of the present invention, in the oscillating vibration damping device according to the third aspect, the inner shaft member and the outer cylindrical member that are spaced apart from each other in the radial direction are connected by the main rubber elastic body. A pair of slits penetrating the main rubber elastic body in the axial direction at portions opposed to each other in one radial direction across the inner shaft member, and the inner shaft member and the outer cylinder in the slit. A cylindrical elastic coupling device having a structure in which an elastic protrusion protruding in the opposing direction of the member is employed, and one of the inner shaft member and the outer cylindrical member of the elastic coupling device is the member to be damped And attaching the other to the support arm, the main rubber elastic body of the elastic coupling device constitutes the coupling rubber, and the radial direction in which the pair of slits of the elastic coupling device are opposed to each other is That the inner shaft member and the outer tubular member as the swinging direction of the lifting arm is constructed of the stopper mechanism to ensure that is caused to abut through the elastic protrusion, and wherein.

  In this aspect, the connecting rubber and the stopper mechanism can be advantageously realized in a single elastic connecting device. In particular, in connection rubber, the main deformation at the time of rocking displacement of the support arm is shear deformation, while at the elastic protrusion, the main deformation at the time of contact with the rocking displacement of the support arm is compression deformation. Therefore, as described in the above fourth aspect, a greater degree of freedom in tuning the spring characteristics can be ensured.

  In addition, although the specific mounting aspect of the elastic coupling device in this aspect is not limited, for example, the axial direction of the elastic coupling device (the axial direction of the inner shaft member and the outer cylinder member) is set with respect to the axial direction of the support arm. The outer cylinder member is fixedly provided on the support arm, and the inner shaft member protrudes outward in the direction perpendicular to the axis of the support arm and is fixed to the vibration suppression target member. It can be mounted by doing. Alternatively, the elastic coupling device is arranged with the axial direction of the support arm facing the axial direction of the support arm, more preferably on the central axis of the support arm, and the inner shaft member is fixedly provided on the support arm, while the outer The cylindrical member can also be mounted by fixing it to the vibration suppression target member. In the latter mounting mode, the inner shaft member may be constituted by a support arm.

(Fifth aspect of the present invention)
According to a fifth aspect of the present invention, in the swing type vibration damping device according to the first to fourth aspects, the connecting rubber is subjected to shear deformation when the support arm swings. It is characterized by being.

  In the swing type vibration damping device of the present aspect, the coupling rubber whose main deformation is shear deformation is adopted, so that the volume of the coupling rubber is ensured to ensure a sufficient durability while the support arm is rocked. Dynamic displacement can be tuned to low spring characteristics. In addition, this aspect is suitably employed in combination with the above-described third or fourth aspect, and in particular, the main deformation in the buffer rubber with which the support arm is oscillated and displaced is set as a compression deformation. By adopting a combination of the above-described modes, the shear spring characteristics of the connecting rubber and the compression spring characteristics of the buffer rubber (elastic protrusion) are considered in an appropriate combination, so that the support spring characteristics when the support arm is swung is changed. It becomes possible to tune in a wider range.

(Sixth aspect of the present invention)
According to a sixth aspect of the present invention, there is provided a swing-type vibration damping device according to any one of the first to fifth aspects, wherein the bottom wall portion has a groove shape with side wall portions erected on both sides in the width direction. A bracket is used to fix the bottom wall of the groove-shaped bracket to the member to be damped, while supporting shafts are provided between the side walls on both sides in the width direction. By mounting the support arm so as to be swingable with respect to the shaft, the pivot shaft is constituted by the support shaft.

  In this aspect, it is possible to mount the swing type vibration damping device according to the present invention while minimizing the processing of the vibration damping target member. Further, since the groove-shaped bracket covers the swing center axis of the support arm with both side walls, it also has a protective function around the swing center axis of the support arm.

  Furthermore, this aspect is suitably employed particularly in combination with the elastic coupling device according to the fourth aspect described above. That is, when the outer cylinder member of the elastic coupling device is fixedly provided on the support arm by arranging the central axis of the elastic coupling device so as to be orthogonal to the central axis of the support arm, The projecting end portions are projected in parallel with the swing center axis of the support arm, and are arranged so as to extend over both side wall portions of the groove-shaped bracket in the same manner as the swing center axis. It can be supported by the part. Accordingly, it is possible to provide a swing type vibration damping device that is integrally assembled including the support arm, the mass portion, the elastic coupling device, and the bracket. And such a rocking | fluctuation type damping device can be mounted | worn to a damping object member only by simple field work which only fixes a bracket to a damping object member.

  As is apparent from the above description, in the swing type vibration damping device structured according to the present invention, a specific arrangement position form or the like is adopted for the connecting rubber that elastically swings and supports the support arm. As a result, in such a connected rubber, it is possible to perform characteristic tuning with a large degree of design freedom while ensuring excellent durability.

  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.

  1 and 2 show a dynamic damper 10 which is a swing type vibration damping device as one embodiment of the present invention. The dynamic damper 10 includes a swing arm 14 as a support arm, and a mass body 16 as a mass portion fixed to the swing arm 14. The dynamic damper 10 is attached to a vibration suppression target member 12 such as a vehicle body, a power unit, or a transmission, and can exhibit a vibration suppression effect.

  More specifically, the swing arm 14 is a rod-shaped metal material extending substantially linearly, and an end portion on one side thereof (the left end portion in FIGS. 1 and 2) is the swing center portion. It is set to 18. The swing center portion 18 is a cylindrical support tube 20 provided integrally with one end of the swing arm 14, and a cylinder that is overlapped with the inner peripheral surface of the support tube 20 and assembled in a housed state. The sliding cylinder 22 is formed in a shape. The sliding cylinder 22 disposed on the inner peripheral side of the support cylinder 20 is desirably formed of a resin or rubber material having a small friction coefficient.

  Further, a swing support shaft 24 as a support shaft that is a swing center axis is inserted into the swing center portion 18. The swing support shaft 24 is a linearly extending shaft body, and both end portions thereof are protruded from the sliding cylinder body 22 and the support cylinder 20 on both sides in the axial direction. Then, both end portions of the swing support shaft 24 are fixedly supported by bracket metal fittings 26 as groove-shaped brackets.

  The bracket metal fitting 26 has a deep groove shape extending in a substantially U-shape, and protrudes in parallel toward the same side from the mounting plate portion 28 as the bottom wall portion and both side edges of the mounting plate portion 28 in the width direction. A support plate portion 30 is provided as a pair of side wall portions provided and opposed to each other. Further, a bolt hole 32 is formed in a substantially central portion of the mounting plate portion 28 so as to penetrate therethrough. The mounting plate portion 28 is bolted to the vibration suppression target member 12 by mounting bolts 34 inserted through the bolt holes 32, and the bracket fitting 26 is attached to the vibration suppression target member 12.

  Then, the swinging center portion 18 is opposed to the swinging support shaft 24 fixedly provided so as to extend linearly in the opposing direction between the opposing surfaces of the pair of support plate portions 30, 30 in the bracket metal fitting 26. Is attached in an extrapolated state, and the swing arm 14 is attached to the bracket fitting 26 so as to be swingable around the swing support shaft 24 with respect to the damping target member 12. In the present embodiment, both end portions of the swing support shaft 24 in the axial direction are fixed to the support plate portions 30 and 30 by bolts or caulking. The support cylinder 20 is inserted into and out of the outer peripheral surface of the swing support shaft 24 through the sliding cylinder 22 with substantially no gap, that is, no backlash. Under such an assembled state, the support cylinder 20 can be slidably displaced in the circumferential direction relative to the swing support shaft 24 via the sliding cylinder 22.

  On the other hand, the other axial end portion (right end portion in FIGS. 1 and 2) of the swing arm 14 is a mass fixing portion 36 in which a thread is formed. The mass body 16 is attached to the mass fixing portion 36.

  The mass body 16 has a thick, substantially disk shape or circular block shape, and is formed of a hard material having a large specific gravity such as iron. A through hole 38 is formed on the central axis of the mass body 16, and the mass fixing portion 36 of the swing arm 14 is inserted into the through hole 38. Further, a set of positioning nuts 40 and 40 are screwed into the mass fixing portion 36 so as to sandwich the mass body 16 from both sides in the thickness direction. The mass body 16 is positioned and fixed with respect to the swing arm 14 by tightening the positioning nuts 40 and 40. In this embodiment, the mass body 16 is attached to the mass fixing portion 36 formed at the other end in the axial direction of the swing arm 14, so that the swing center portion 18 (the swing support shaft) is attached. The mass body 16 is disposed at a position off 24).

  Thus, the mass body 16 is oscillated and displaced as the oscillating arm 14 attached to the vibration suppression target member 12 via the bracket fitting 26 is oscillated. The swing arm 14 is elastically connected to the bracket fitting 26 by an elastic connecting device 42 described later. The sub-vibration system for the damping target member 12 is configured by elastically supporting the swing arm 14 in the swing direction by the spring component of the elastic coupling device 42. That is, in the present embodiment, the elastic coupling device 42 constitutes a coupling rubber.

  Then, the natural frequency of the secondary vibration system is tuned to a vibration frequency that causes a problem in the vibration suppression target member 12 that is the main vibration system. A dynamic damper 10 that can exhibit a damping effect is configured.

  In the present embodiment, since the mass body 16 is positioned in the axial direction of the swing arm 14 by the positioning nut 40, the tightening position of the positioning nut 40 is changed and adjusted in the axial direction of the swing arm 14. Thus, the separation distance of the center of gravity of the mass body 16 from the swing support shaft 24 as the swing center shaft can be easily changed. Therefore, the secondary vibration is determined according to the mass of the mass body 16 and the separation distance of the center of gravity point from the swing support shaft 24 according to the resonance frequency of the main vibration system constituted by the vibration suppression target member 12. The resonance frequency of the system can be tuned.

  Here, the above-described elastic coupling device 42 is disposed at an intermediate portion in the axial direction of the swing arm 14. The elastic coupling device 42 has a cylindrical shape as a whole, and has a structure in which an inner cylinder fitting 44 as an inner shaft member and an outer cylinder fitting 46 as an outer cylinder member are elastically connected by a main rubber elastic body 48. ing.

  More specifically, the inner cylinder fitting 44 is formed of a metal material having a small-diameter cylindrical shape. Further, on the substantially same central axis as the inner cylinder fitting 44, an outer cylinder fitting 46 is disposed spaced radially outward. The outer cylinder fitting 46 has a cylindrical shape with a larger diameter than the inner cylinder fitting 44. Further, a main rubber elastic body 48 is disposed between the radially opposed surfaces of the inner cylinder fitting 44 and the outer cylinder fitting 46 thus arranged. The main rubber elastic body 48 has a substantially cylindrical shape, and its inner peripheral surface is fixed to the outer peripheral surface of the inner cylindrical metal fitting 44, while its outer peripheral surface is fixed to the inner peripheral surface of the outer cylindrical metal fitting 46. . In short, the elastic coupling device 42 is constituted by an integrally vulcanized molded product of the main rubber elastic body 48 including the inner cylinder fitting 44 and the outer cylinder fitting 46.

  In the main rubber elastic body 48, a pair of hollow holes 50 are formed as through spaces (slits) so as to sandwich the inner cylindrical metal fitting 44 in one direction perpendicular to the axis. The fillet hole 50 is formed over a length of half a circumference or less in the circumferential direction, and the main rubber elastic body 48 is penetrated in the axial direction by the fillet hole 50.

  In addition, a stopper rubber 52 as a pair of elastic protrusions is protruded from each inner hole 50 so as to protrude radially outward from the inner tube fitting 44 in a direction perpendicular to the axis. In this embodiment, the stopper rubber 52 has a substantially quadrangular pyramid shape that gradually tapers toward the protruding tip, and is integrally formed with the main rubber elastic body 48. The stopper rubber 52 in the present embodiment is protruded in a direction substantially perpendicular to the axial direction of the inner cylinder fitting 44, and the main rubber elasticity of which the protruding tip is fixed to the inner peripheral surface of the outer cylinder fitting 46. The body 48 is positioned in the thinning hole 50 so as to be slightly separated from the body 48 in the radial direction (perpendicular to the axis). Further, the pair of stopper rubbers 52 constitute the cushion rubber in the present embodiment.

  Further, since the pair of thinning holes 50 are formed so as to face the main rubber elastic body 48 in one direction perpendicular to the axis, the pair of thinning holes 50 (the pair of stopper rubbers 52) are opposed to each other. The main rubber elastic body 48 has a narrow width in the circumferential direction in a direction perpendicular to the axis that is substantially perpendicular to the axis (left and right in FIG. 2), and a connecting arm portion 53 extending in the left and right direction is formed in FIG. . In this embodiment, as is apparent from FIG. 2, one direction perpendicular to the axis that is substantially perpendicular to one direction perpendicular to the axis in which the pair of hollow holes 50 are formed in the main rubber elastic body 48. Thus, the inner cylinder fitting 44 and the outer cylinder fitting 46 are elastically connected by the main rubber elastic body 48. That is, in the main rubber elastic body 48, the inner peripheral portion fixed to the inner cylindrical metal fitting 44 and the outer peripheral portion fixed to the outer cylindrical metal fitting 46 are mutually connected by the connecting arm portion 53 in the direction perpendicular to the axis. The inner cylinder fitting 44 and the outer cylinder fitting 46 are elastically connected to each other by the main rubber elastic body 48.

  The elastic coupling device 42 having such a structure is attached to an intermediate portion in the axial direction of the swing arm 14 by fixing the swing arm 14 to the outer peripheral surface of the outer tube fitting 46. In addition, an axial direction intermediate part means the whole area | region covering between both ends, and does not mean the axial center. In the present embodiment, the elastic coupling device 42 is disposed on the center axis of the swing arm 14 at a position slightly deviated toward the swing center axis side from the center between the swing center axis and the mass center of gravity. ing.

  As is clear from this, the elastic coupling device 42 in the present embodiment is located closer to the swing support shaft 24 than the center of gravity of the mass body 16 provided near the other end of the swing arm 14. It is arranged. In the present embodiment, the swing arm 14 seems to be physically divided at a part of the intermediate portion in the axial direction of the swing arm 14, but on the outer peripheral surface of the outer tube fitting 46 in the elastic coupling device 42. When the swing arm 14 is fixed, it can be recognized that the swing arm 14 extends substantially linearly including the outer tube fitting 46 integrally at an axial intermediate portion thereof.

  On the other hand, a stopper support shaft 54 as a stopper portion is inserted into the inner cylindrical metal fitting 44 in the elastic coupling device 42. The stopper support shaft 54 is disposed between the opposing surfaces of the pair of support plate portions 30 in the bracket fitting 26 so as to extend in the opposing direction of the pair of support plate portions 30, and both end surfaces thereof are a pair of support plates. It is fixed to the portion 30 with a bolt or the like. The swing support shaft 24 and the stopper support shaft 54 are disposed in parallel at a predetermined distance from each other, and are disposed perpendicular to the swing arm 14 in the same direction.

  As a result, the elastic coupling device 42 has its inner tubular fitting 44 attached to the vibration-damping target member 12 via the bracket fitting 26 and its outer tubular fitting 46 fixed to the swing arm 14. The middle of the swing arm 14 in the axial direction is elastically connected to and supported by the vibration control target member 12 by the elastic connecting device 42. In the present embodiment, the pair of stopper rubbers 52 formed on the main rubber elastic body 48 of the elastic coupling device 42 are respectively mounted in a state where the elastic coupling device 42 is attached to the vibration suppression target member 12 and the swing arm 14. A pair of connecting arms projecting in a direction perpendicular to the axis substantially parallel to the swing direction of the swing arm 14 and formed in one direction perpendicular to the axis substantially perpendicular to the pair of stopper rubbers 52. Each of the portions 53 is formed to extend in the axial direction of the swing arm 14.

  When the swing arm 14 is swung around the swing support shaft 24 in response to the input vibration, the inner cylindrical metal member 44 and the outer cylindrical metal member 46 are radially attached to the main rubber elastic body 48 of the elastic coupling device 42. In the pair of left and right connecting arm portions 53 in FIG. 2 formed so as to be continuously connected to each other, elastic deformation is caused. Based on the support spring characteristic exhibited based on the elastic deformation of the main rubber elastic body 48, the swing arm 14 is allowed to be elastically swung around the swing support shaft 24. . Here, when the swing arm 14 is swung, the elastic deformation generated in the pair of connecting arm portions 53 in the main rubber elastic body 48 is mainly shear deformation.

  Further, when the swinging displacement of the swinging arm 14 increases, specifically, a constant value set between the radially opposed surfaces of the stopper rubber 52 provided in the elastic coupling device 42 and the inner peripheral surface of the fillet hole 50. When the oscillating arm 14 is oscillated and displaced larger than the separation distance, the stopper rubber 52 is brought into contact with the main rubber elastic body 48 fixed to the inner peripheral surface of the outer cylinder fitting 46 in a direction substantially perpendicular to the axis. As a result, a greater spring characteristic is exhibited when the swing arm 14 is displaced by the elastic deformation of the stopper rubber 52. The elastic deformation of the stopper rubber 52 is mainly compression deformation, and exhibits greater spring rigidity than the shear deformation in the pair of connection arm portions 53 described above. When the swinging displacement of the swinging arm 14 gradually increases, finally, the spring characteristic of the stopper rubber 52 increases nonlinearly, and the swinging displacement of the swinging arm 14 is limited in a buffer manner. As is clear from this, in this embodiment, the stopper mechanism is configured including the stopper rubber 52.

  Based on the elastic deformation of the main rubber elastic body 48 and the stopper rubbers 52 and 52 due to the swing displacement of the swing arm 14, the spring component and the damping component can be obtained effectively.

  By appropriately setting the shape and material of the main rubber elastic body 48 and the shape and material of the stopper rubber 52, the spring component and damping component of the dynamic damper 10 can be set as appropriate, and the main vibration system It is possible to tune the resonance frequency of the oscillating dynamic damper 10 which is a secondary vibration system according to the resonance frequency.

  Further, by providing the elastic coupling device 42 in the middle portion of the swing arm 14, the swing displacement amount of the swing arm 14 can be limited even when excessive vibration is input. It is possible to avoid problems such as contact with the peripheral members due to the rocking displacement.

  Further, the elastic coupling device 42 is disposed in the middle portion of the swing arm 14 and the mass body 16 is attached to the vicinity of the end of the swing arm 14 on the side opposite to the swing center portion 18, thereby elastically connecting. The device 42 is disposed at a position closer to the swing support shaft 24 than the center of gravity of the mass body 16. Therefore, the swinging amplitude at the position where the elastic coupling device 42 is disposed can be made smaller than the swinging amplitude at the position where the mass body 16 is disposed, so that the main rubber elastic body 48 and the stopper rubber 52 in the elastic coupling device 42 are provided. Thus, it is possible to advantageously improve the durability of the elastic coupling device 42 by avoiding excessive elastic deformation.

  In the present embodiment, since the elastic coupling device 42 is provided in the middle portion of the swing arm 14, the elastic coupling device 42 can be advantageously provided without causing an increase in the size of the device.

  As mentioned above, although one Embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, in the above-described embodiment, the stopper rubber 52 formed integrally with the main rubber elastic body 48 is perpendicular to the axial direction from the main rubber elastic body 48 whose protruding tip is fixed to the inner peripheral surface of the outer cylinder fitting 46. Although formed so as to be slightly separated, the protruding tip of the stopper rubber 52 may be brought into contact with the main rubber elastic body 48 in advance. Alternatively, the stopper rubber 52 is not always necessary. On the other hand, the pair of lightening holes 50 may be omitted. In the case where no hollow hole is provided, the spring characteristic exhibited by the rubber elastic body 48 when the swing arm 14 swings is relatively hard due to the compression / tensile component being dominant. Is done.

  Moreover, the arrangement | positioning direction with respect to the perpendicular direction of the dynamic damper 10 is not limited at all. Specifically, the mass body 16 may be swung up and down in a substantially vertical direction, and the direction in which the mass body 16 is swung is swung in a substantially horizontal direction left and right and in other directions. The mounting direction may be set.

  In the above-described embodiment, the elastic coupling device 42 is disposed at the intermediate portion of the swing arm 14. However, the elastic connection device 42 is not necessarily provided between the swing center portion 18 and the mass body 16. There is no need. Specifically, for example, the rocking center portion 18 is provided in the middle portion of the rocking arm 14, and the elastic coupling device 42 is provided at one end of the rocking arm 14. It is also possible to attach the mass body 16 to the end of the other side of 14. Even in such an arrangement, the separation distance between the swing center portion 18 (swing support shaft 24) and the center of gravity of the mass body 16 is elastically connected to the swing center portion 18 (swing support shaft 24). The distance from the device 42 (stopper support shaft 54) is longer.

  Further, the shape of the mass body 16 and the method of attaching the mass body 16 to the swing arm 14 are not limited in any way by the above embodiment. For example, in the above-described embodiment, one elastic coupling device 42 is provided on the swing arm 14, and the swing displacement amount of the swing arm 14 is limited by the elastic connection device 42. Two or more elastic coupling devices 42 are arranged on both sides in the direction perpendicular to the axis of the oscillating arm 14 so as to sandwich the oscillating arm 14, and the oscillating displacement amount of the oscillating arm 14 by these plural elastic coupling devices 42. May be restricted.

  In addition, a plurality of swing arms 14 may be fixedly provided with respect to the support cylinder 20 at a predetermined distance in the axial direction or at a predetermined distance in the circumferential direction. In particular, by providing a plurality of swing arms at substantially equal intervals in the circumferential direction of the support cylinder 20, the support balance of the swing arm 14 can be made uniform.

  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 a top view which shows the dynamic damper as one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the dynamic damper shown by FIG. 1, Comprising: It is a figure corresponded in the II-II cross section in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dynamic damper 12 Damping object member 14 Swing arm 16 Mass body 18 Swing center part 24 Swing support shaft 42 Elastic coupling device 54 Stopper support shaft

Claims (6)

A support arm is supported so as to be swingable and displaceable around a swing center axis with respect to a vibration control target member, and a mass portion having a center of gravity is provided at a position off the swing center axis of the support arm. In the swing-type vibration damping device configured to exert a vibration damping effect on the vibration-damping target member based on an elastic rocking displacement around the rocking central axis of the support arm,
The support arm is elastically connected to the damping target member at a position off the swing center axis of the support arm and at a position closer to the swing center axis than the center of gravity of the mass portion. A swing type vibration damping device characterized in that a connecting rubber is provided, and the support arm is supported by the connecting rubber so as to be elastically swingable about the swing center axis.   The support arm has a longitudinal rod shape, and one end portion in the longitudinal direction is attached so as to be able to swing and displace with respect to the damping target member, and the other end portion 2. The swing type braking device according to claim 1, further comprising a mass portion, wherein a longitudinal intermediate portion of the support arm is elastically connected to the damping target member by the connecting rubber. Shaker.   A stopper portion is provided on the damping target member so as to be opposed to the support arm at a predetermined distance in the swing direction, and a shock absorbing rubber is provided on a surface facing the support arm in the swing direction of the stopper portion. By providing a stopper mechanism that limits the swing displacement amount of the support arm in a buffering manner by contacting the stopper portion via the buffer rubber when the support arm swings and displaces beyond a certain level. The swing type vibration damping device according to claim 1 or 2.   The inner shaft member and the outer cylinder member, which are spaced apart from each other in the radial direction, are connected by a main rubber elastic body, and the main rubber elastic body is pivoted at a portion opposed in one radial direction across the inner shaft member. A cylindrical elastic coupling device having a structure in which a pair of slits penetrating in the direction is formed and an elastic protrusion protruding in the opposing direction of the inner shaft member and the outer cylindrical member is provided in the slit. Then, by attaching one of the inner shaft member and the outer cylinder member of the elastic coupling device to the member to be damped and attaching the other to the support arm, the coupling with the main rubber elastic body of the elastic coupling device The inner shaft member and the outer cylindrical member are interposed between the elastic protrusions with the radial direction in which the pair of slits of the elastic coupling device are positioned facing each other as the swinging direction of the support arm. Oscillating vibration damping device according to claim 3 which constitute the stopper mechanism to ensure that is caused to abut Te.   The swing type vibration damping device according to any one of claims 1 to 4, wherein the connecting rubber is subjected to shear deformation when the support arm swings and displaces. A groove-shaped bracket with side walls standing on both sides in the width direction of the bottom wall portion is adopted, and the bottom wall portion of the groove-shaped bracket is fixed to the member to be damped, while the both sides in the width direction are 6. A support shaft is provided across the side wall portions of the first support shaft, and the support arm is swingably attached to the support shaft, whereby the swing center shaft is configured by the support shaft. The swing type vibration damping device according to any one of the above.

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