JP6615020B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a dynamic damper that suppresses vibration by being attached to a vibration suppression target member in which vibration such as a body of an automobile or an exhaust pipe is a problem.

  2. Description of the Related Art Conventionally, a dynamic damper is known as a type of damping device that suppresses vibration in a damping target member. The dynamic damper constitutes a mass-spring sub-vibration system by elastically supporting and attaching a mass member via a spring member to a vibration suppression target member constituting the main vibration system. Then, the problem vibration in the main vibration system is reduced by utilizing the resonance phenomenon of the sub vibration system.

  By the way, in order to obtain the desired damping effect in the dynamic damper, the natural frequency of the secondary vibration system is tuned according to the problem vibration in the main vibration system, and the mass mass of the secondary vibration system is appropriately secured. It is also necessary.

  Furthermore, if the mass member is separated and dropped when the spring member is damaged for some reason, it may strike against other members, causing secondary damage, etc. Therefore, a safety mechanism (fail-safe mechanism) is also required.

  Therefore, in a dynamic damper having a conventional structure, as shown in, for example, Japanese Patent Application Laid-Open No. 2012-47316 (Patent Document 1) and the like, it is caught on the base member attached to the vibration suppression target member side to prevent complete separation. It has been proposed to provide the engaging member to be fixed to the mass member with a bolt or the like.

  However, in such a conventional safety mechanism, a separate locking member is required, and it is also necessary to fix the locking member to the mass member with a bolt or the like. Increase was difficult to avoid.

  In addition, the dynamic damper having a conventional structure merely employs a large mass member to secure mass mass. For this reason, when the mass member is enlarged, not only is it difficult to secure the arrangement space, but the mass member is increased in inertia moment, and the mass member is subjected to an external force exerted in a direction different from the vibration to be damped. There is also a problem that it is difficult to suppress and converge the different direction motions such as swinging that are different from the original translational motion.

JP 2012-47316 A

  The present invention has been made in the background as described above, and the problem to be solved is that a fail-safe mechanism can be realized with a small number of parts, and mass mass can be made efficient while suppressing the opposite direction movement of the mass member. It is an object of the present invention to provide a dynamic damper having a novel structure that can be set automatically.

  In the first aspect of the present invention, the mass metal fitting is elastically connected by a rubber elastic body to the support plate metal fitting of the portal plate structure in which a pair of leg plate portions are provided on both sides in the length direction of the top plate portion. In the dynamic damper in which the support plate metal fitting is attached to the member to be damped, the mass metal fitting is a cast product, and the main body block portion and the main body are arranged in a region surrounded by the support plate metal fitting A projecting block portion projecting from the center portion of the block portion toward the top plate portion is integrally formed, and an opening hole is formed in the top plate portion of the support plate metal fitting so that the projection of the mass metal fitting is formed. A block portion is protruded outwardly through the opening hole, and is positioned around the protruding block portion in a mounted state in which a space between the leg plate portions on both sides of the support plate metal fitting is covered with the vibration suppression target member. Of the support plate While a fail-safe mechanism that prevents the mass metal fitting from falling off is formed including the peripheral portion of the opening hole, the opposing surface of the main body block portion to the both leg plate portions has a small surface roughness. In this case, the dynamic damper is characterized by a post-processed surface, and the rubber elastic body is bonded to the post-processed surface.

  In the dynamic damper having the structure according to this aspect, the protruding block portion is integrally formed from the center portion of the main body block portion in the mass metal fitting so as to protrude in the direction perpendicular to the length direction from the center of gravity of the main body block portion. Thus, a protruding block portion is provided. Therefore, the mass of the mass metal fitting can be set to be large by the protruding block portion while suppressing an increase in the moment of inertia around the center of gravity of the main body block portion.

  Moreover, since the mass metal fitting is a cast product, shape setting in which the main body block portion and the protruding block portion are integrally formed can be easily realized. In addition, since the adhesive surface of the rubber elastic body is a post-processed surface with a surface roughness smaller than that of the casting surface, the adhesive strength and reliability of the rubber elastic body are secured without being restricted by the material of the mold. However, it is possible to employ a cast mass fitting that is lower in cost than a machined molded product.

  In addition, since the protruding block portion abuts on the peripheral edge portion of the opening hole, the support plate bracket is prevented from coming out in the length direction of the main body block portion, so that a special locking member or the like is required. The fail-safe mechanism can be realized with a simple structure.

  A second aspect of the present invention is the dynamic damper according to the first aspect, wherein the rubber elastic body is positioned on the outer peripheral surface of the main body block portion so as to face the both leg plate portions of the support plate metal fitting. Compared to the bonded support surface, the other non-support surface has a different inclination angle in the protruding direction of the leg plate portion from the top plate portion, and the non-support surface has an outer peripheral dimension downward. A smaller taper taper is provided.

  In the dynamic damper of this aspect, the casting mass bracket is provided with an appropriate taper on the outer peripheral surface of the main body block portion while setting an inclination angle in consideration of the support spring characteristics and the adhesion durability of the rubber elastic body on the support surface. It is also possible to improve the demolding property.

  A third aspect of the present invention is the dynamic damper according to the first or second aspect, wherein a convex portion is formed on a portion of the outer peripheral surface of the main body block portion facing the both leg plate portions of the support plate metal fitting. Is formed, and the protruding tip surface of the convex portion is the post-processed surface.

  In the dynamic damper according to this aspect, since the protruding tip surface of the convex portion is a post-processed surface, it is easy to process the post-processed surface. Further, for example, by fixing the rubber elastic body including the stepped surface on the outer periphery of the convex portion, it is possible to efficiently secure the fixing area of the rubber elastic body to the mass metal fitting.

  According to a fourth aspect of the present invention, in the dynamic damper according to any one of the first to third aspects, the main body in which the rubber elastic body is bonded so as to face the both leg plate portions of the support plate metal fitting. A recess is formed on the support surface of the block portion.

  In the dynamic damper of this aspect, for example, while securing the mass of the mass metal fitting, the effective length of the rubber elastic body that elastically supports the mass metal fitting on the support plate metal fitting corresponding to the depth of the concave portion provided on the support surface is increased. It can also be set. In addition, for example, by providing one or a plurality of recesses on the support surface, it is possible to efficiently secure a fixing area of the rubber elastic body to the mass metal fitting by the bottom surface of the recess and the surrounding step surface. In this aspect, for example, it is possible to use substantially the entire adhesive surface of the main rubber elastic body in the mass metal fitting as a concave portion and the bottom surface of the concave portion as a post-processed surface, for example, the convex portion according to the third aspect. In combination, it is also possible to form at least one concave portion according to the present embodiment with respect to the protruding front end surface of the convex portion.

  According to a fifth aspect of the present invention, in the dynamic damper according to any one of the first to fourth aspects, the main body block is larger than a length dimension in a passing direction in the support plate metal fitting of the portal plate structure. The length dimension of the portion is increased, and both side portions in the length direction of the main body block portion are arranged so as to protrude from the region surrounded by the support plate fitting to both sides in the passage direction.

  In the dynamic damper of this aspect, by projecting the both sides in the length direction of the main body block portion outward from the support plate bracket, it is possible to further increase the mass mass while avoiding an increase in the size of the support plate bracket. Can do. Preferably, in this aspect, a buffer rubber film that covers the surface of the main body block portion that protrudes outward from the support plate metal fitting is formed integrally with the rubber elastic body.

  According to a sixth aspect of the present invention, in the dynamic damper according to any one of the first to fifth aspects, an annular step portion is provided in a peripheral portion of the opening hole of the top plate portion in the support plate metal fitting. In addition, a buffer stopper rubber that covers a surface of the mass metal fitting that faces the outer peripheral surface of the protruding block portion is fixed to the peripheral portion of the opening hole.

  In the dynamic damper of this aspect, since the peripheral portion of the opening hole is reinforced by the annular stepped portion, a stopper that limits excessive displacement of the mass metal fitting by buffering the protruding block portion to the peripheral portion of the opening hole The mechanism can be realized with good load bearing performance and a small number of parts.

  In this aspect, preferably, the inner peripheral surface of the stepped portion is also covered with a buffering stopper rubber so as to constitute the contact surface of the protruding block portion. As a result, the contact surface of the protruding block portion can be secured with a dimension width larger than the plate thickness of the top plate portion, and the volume of the buffer rubber for buffering can be set to be large so that the buffering action can be improved. .

  In the dynamic damper having the structure according to the present invention, the protruding block portion is integrally formed from the central portion of the main body block portion in the mass metal fitting, and protrudes from the center of gravity of the main body block portion in a direction orthogonal to the length direction. Thus, a protruding block portion is provided. Therefore, the mass of the mass metal fitting can be set to be large by the protruding block portion while suppressing an increase in the moment of inertia around the center of gravity of the main body block portion.

  Moreover, since the mass metal fitting is a cast product, shape setting in which the main body block portion and the protruding block portion are integrally formed can be easily realized. In addition, since the adhesive surface of the rubber elastic body is a post-processed surface with a surface roughness smaller than that of the casting surface, the adhesive strength and reliability of the rubber elastic body are secured without being restricted by the material of the mold. However, it is possible to employ a cast mass fitting that is lower in cost than a machined molded product.

  In addition, since the protruding block portion abuts on the peripheral edge portion of the opening hole, the support plate bracket is prevented from coming out in the length direction of the main body block portion, so that a special locking member or the like is required. The fail-safe mechanism can be realized with a simple structure.

The top view which shows the dynamic damper as one Embodiment of this invention in a mounting state. The front view of the dynamic damper shown by FIG. The side view of the dynamic damper shown in FIG. IV-IV sectional drawing in FIG. VV sectional drawing in FIG. VI-VI sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the dynamic damper as another aspect of this invention, Comprising: The figure corresponding to FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 6 show a dynamic damper 10 as an embodiment of a dynamic damper according to the present invention, which is mounted on a body of an automobile, for example, to reduce vibrations. The dynamic damper 10 has a structure in which a mass metal fitting 14 is elastically supported by a rubber elastic body 16 with respect to a support plate metal fitting 12. And the supporting plate metal fitting 12 is fixed with respect to the damping target members 18, such as a vehicle body which is the main vibration system, so that a secondary vibration system composed of a mass-spring system is configured. In the following description, the vertical direction refers to the vertical direction in FIG. Moreover, the left-right direction means the left-right direction in FIG.

  More specifically, the support plate metal fitting 12 is formed in a gate shape as a whole, and a top plate portion 20 that extends to the left and right, and a pair of left and right leg plates that extend substantially in parallel downward from both longitudinal ends of the top plate portion 20. Parts 22 and 22.

  In addition, attachment plate portions 24 and 24 are provided at the lower ends of both leg plate portions 22 and 22 so as to spread outward toward the opposite sides. Each mounting plate portion 24 is formed with a bolt insertion hole 26. As shown in FIG. 2, the mounting plate portions 24, 24 are superimposed on the vibration suppression target member 18, and the fixing plate 12 is inserted into the bolt insertion holes 26, 26 by the fixing bolts 28, 28. Is fixedly attached to the vibration suppression target member 18.

  Furthermore, an opening hole 30 is formed in the top plate portion 20. In particular, in the present embodiment, a circular opening hole 30 is provided in the approximate center of the top plate portion 20.

  In addition, an annular step portion 32 that rises upward is formed at the peripheral portion of the opening hole 30 in the top plate portion 20. Then, the opening edge portion 34 of the opening hole 30 is positioned above the top plate portion 20 by the height dimension A of the step portion 32.

  For example, a press-processed product is preferably used as the support plate metal fitting 12. That is, the target support metal fitting 12 can be obtained through press punching of a predetermined metal base plate and then through progressive press bending. In particular, in this embodiment, the top plate portion 20 and the leg plate portions 22 and 22 are formed so as to extend in the left-right direction and the up-down direction with a constant plate width dimension throughout.

  On the other hand, the mass metal fitting 14 is an integrally cast product made of metal such as iron, and includes a main body block portion 40 having a substantially rectangular block shape as a whole. In addition, a protruding block portion 42 that protrudes upward is integrally formed at the center of the main body block portion 40 in the length direction.

  The main body block portion 40 has a substantially rectangular cross section that is slightly smaller than the region surrounded by the top plate portion 20 and the both leg plate portions 22 and 22 of the support plate fitting 12. And the main body block part 40 is extended in the length direction (left-right direction in FIG. 3) with a substantially constant cross-sectional shape.

  Further, the outer peripheral surface of the main body block portion 40 is formed as an inclined surface 44 that gradually goes inward as it goes from the top to the bottom. That is, the main body block 40 has a tapered shape in which the lower surface is smaller than the upper surface and is narrowed downward. Of the outer peripheral surface of the main body block portion 40, both end surfaces in the length direction are slightly smaller in inclination angle than both end surfaces in the width direction.

  Furthermore, plate-like convex portions 46 and 46 projecting outward are formed on both end surfaces in the width direction of the main body block portion 40 at the central portion in the length direction. That is, the outer peripheral surface of the main body block portion 40 is configured to include the inclined surface 44 and the protruding tip surfaces of the convex portions 46 and 46. And the inclination angle different from the other inclined surface 44 is set to the protrusion front end surface of this convex part 46,46. In particular, in the present embodiment, the projecting tip surfaces of the protrusions 46 and 46 have a planar shape with a tilt angle smaller than that of the tilted surface 44 and spread substantially in the vertical direction, and close to the lower end from the upper end of the main body block unit 40. Has spread.

  In addition, the convex portions 46 and 46 are subjected to surface treatment on the projecting tip surface, whereby the adhesive surfaces 48 and 48 of the rubber elastic body 16 are formed. That is, in the present embodiment, the mass metal fitting 14 made of a cast product has a casting surface in which the outer peripheral surface and the upper and lower surfaces of the main body block portion 40 are molded with a casting mold. On the other hand, the projecting tip surfaces of the protrusions 46 and 46 are post-processed after the mass metal fitting 14 is cast, so that the surface roughness is made smaller than the casting surface, and the adhesive surfaces 48 and 48 are configured. Has been.

  The post-processing of the projecting tip surfaces of the protrusions 46 and 46 can be performed by polishing, grinding, cutting, or the like, but preferably blasting such as shot blasting or sand blasting is performed. Further, the surface roughness of the bonding surfaces 48, 48 varies depending on the required bonding performance and the material of the rubber elastic body 16 to be used, and is not limited. Generally, however, the value of the ten-point average roughness Rz of the JIS standard. It is desirable that the thickness is 100 μm or less, and is practically set within a range of about 5 to 100 μm.

  Furthermore, the protruding block part 42 protrudes upward from the upper surface of the main body block part 40 with an outer peripheral shape that is slightly smaller than the opening hole 30 of the top plate part 20 of the support plate 12. The protruding block portion 42 has a central axis set on a straight line extending in the vertical direction through the center of gravity of the main body block portion 40.

  Further, the protruding block portion 42 has a tapered outer peripheral surface 50 whose outer peripheral length gradually decreases upward. Particularly in the present embodiment, the protruding block 42 has a circular cross-sectional shape, and the outer diameter dimension gradually decreases upward.

  Further, as described above, the outer peripheral surfaces of the main body block portion 40 and the protruding block portion 42 are respectively provided with a tapered shape, so that the mass metal fitting 14 has the upper surface of the main body block portion 40 as a parting surface from the mold. Demolding is also easy.

  And the main body block part 40 is arranged in the insertion state in the area | region enclosed by the top-plate part 20 and both leg board parts 22 and 22 of the support plate metal fitting 12, and the protrusion block part 42 of the support plate metal fitting 12 is provided. It is arranged in an inserted state in the opening hole 30 of the top plate portion 20. As shown in FIGS. 2 and 4, between the main body block portion 40 and the top plate portion 20, both leg plate portions 22 and 22 of the support plate 12, and the damping target member 18, as shown in FIGS. A gap is set, and a gap is also set between the protruding block part 42 and the opening hole 30 of the support plate 12. In particular, in the present embodiment, the center of gravity: G of the mass metal fitting 14 is set so as to be positioned substantially at the center of the region surrounded by the top plate portion 20 and the both leg plate portions 22, 22 of the support plate metal fitting 12.

  Here, as shown in FIGS. 1, 3, 5, and 6, the main body block portion 40 is formed with a length dimension that is larger than the length dimension of the gate-shaped support plate fitting 12 in the passing direction. ing. And the length direction both sides of the main body block part 40 are each projected and arrange | positioned to the both sides of the gate passage direction in the support plate metal fitting 12 made into the gate shape.

  Further, as shown in FIGS. 2, 4, and 5, the protruding block portion 42 has a dimension from the upper surface of the main body block portion 40 to the upper surface of the top plate portion 20 of the support plate metal 12: The gap between the member 18 and the lower surface of the main body block 40 is formed with a projection height: H larger than the dimension: h1 plus h2. Even when the lower surface of the main body block 40 is in contact with and overlapped with the damping target member 18 that covers the lower open surface of the support plate 12, the peripheral edge of the opening hole 30 of the top plate 20 of the support plate 12. By maintaining the hooking of the protruding block portion 42 with respect to the portion, the mass metal fitting 14 is prevented from being detached due to coming off from the support plate metal fitting 12.

  In the present embodiment, since the top plate portion 20 of the support plate 12 is provided with the step portion 32 having the height dimension A, the protruding height H of the protruding block portion 42 is equal to h1 + h2. On the other hand, the height of the stepped portion 32 is set larger than the dimension obtained by adding A: h1 + h2 + A. That is, when H ≧ h1 + h2, it is possible to prevent the mass bracket 14 from being detached by being pulled out from the top plate portion 20 of the support plate 12, but when H ≧ h1 + h2 + A, it is also possible to prevent the separation from the opening hole 30. It becomes.

  Further, the rubber elastic body 16 that elastically supports the mass metal fitting 14 on the support plate metal 12 is provided between the opposing surfaces of the both side surfaces in the width direction of the main body block portion 40 and both leg plate portions 22 and 22 of the support plate metal fitting 12. ing. In particular, in the present embodiment, the rubber elastic body 16 extends linearly in a substantially horizontal direction with a substantially constant cross-sectional shape between the opposed surfaces of the main body block portion 40 to the both leg plate portions 22 and 22.

  Further, in the main body block portion 40 of the mass metal fitting 14, adhesive surfaces 48, 48 are arranged at portions facing the both leg plate portions 22, 22, and the rubber elastic body 16 is bonded surfaces (post-processed surfaces) 48, 48. Is vulcanized and bonded. That is, on the outer peripheral surface of the main body block portion 40, the protruding front end surfaces 48, 48 of the convex portions 46, 46 serve as a support surface to which the rubber elastic body 16 is bonded. On the other hand, on the outer peripheral surface of the main body block portion 40, the surfaces other than the projecting tip surfaces 48, 48 of the convex portions 46, 46, that is, the inclined surface 44, The surface (support surface) directly bonded to the bonding end surface is a surface (non-support surface) that is off. However, as will be described later, a covering rubber layer (52) formed integrally with the rubber elastic body 16 may be fixed to the non-supporting surface (inclined surface 44).

  In the present embodiment, the rubber elastic body 16 is formed by vulcanization molding of a rubber material in a molding cavity in which the support plate metal fitting 12 and the mass metal fitting 14 are set. 16 is vulcanized and bonded to the support plate 12 and the mass 14.

  A covering rubber layer 52 that is integrally formed with the rubber elastic body 16 is attached to the surface of the mass metal fitting 14. And the surface of the main body block part 40 is covered with the covering rubber layer 52 over substantially the whole surface except the center part of the bottom face. Further, the surface of the protruding block portion 42 is also covered with the covering rubber layer 52 except for the protruding tip portion.

  Furthermore, the top plate portion 20 of the support plate metal 12 is formed with a buffer rubber 54 as a buffer stopper rubber that is fixed to the peripheral portion of the opening hole 30 including the step portion 32. The buffer rubber 54 is formed so as to cover not only the inner peripheral surface of the opening hole 30 facing the protruding block portion 42 but also the inner peripheral surface of the stepped portion 32. In the present embodiment, the buffer rubber 54 is formed integrally with the rubber elastic body 16 via a covering rubber layer 56 attached to the inner surface of the support plate metal 12.

  As a result, in the support plate 12, the contact surface facing the outer peripheral surface of the protruding block 42 of the mass bracket 14 with a predetermined distance in the direction orthogonal to the central axis of the protruding block 42 is opened. The buffer rubber 54 covers an area extending from the inner peripheral surface of the hole 30 to the inner peripheral surface of the step portion 32.

  In the mass fitting 14, the amount of displacement in the direction orthogonal to the central axis of the protruding block portion 42 is buffered by the contact of the protruding block portion 42 with the inner peripheral surface of the buffer rubber 54. .

  Further, in the top plate portion 20 of the support plate metal member 12, the surface facing the upper surface of the main body block portion 40 of the mass metal member 14 in the vertical direction is constituted by the lower surface of the buffer rubber 54. The amount of upward displacement of the mass metal fitting 14 is buffered by the contact with the buffer rubber 54.

  In addition, about the downward displacement amount of the mass metal fitting 14, the main body block unit 40 abuts on the vibration suppression target member 18 via the covering rubber layer 52 that covers the outer peripheral edge of the lower surface of the main body block unit 40. It will be limited in buffer.

  As described above, the dynamic damper 10 having such a structure is configured such that the support plate 12 is fixed to the vibration suppression target member 18 by the fixing bolts 28, 28, so that the leg plate 22, The lower opening portion between 22 is mounted in a state covered with the vibration control target member 18. The mass of the mass metal fitting 14 and the spring constant of the rubber elastic body 16 are adjusted in accordance with the vibration frequency to be damped in the vibration damping target member 18, and the natural frequency of the mass-spring system constituting the sub-vibration system is adjusted. Is tuned to set the desired damping effect.

  When the dynamic damper 10 is attached to the vibration suppression target member 18, even if the rubber elastic body 16 is broken, for example, the protruding block portion 42 and the opening edge portion 34 of the opening hole 30 are in contact with each other. The horizontal extraction of the mass metal fitting 14 from the support plate metal fitting 12 is prevented. Therefore, a fail-safe mechanism that includes the peripheral portion (opening edge portion 34) of the opening hole 30 and prevents the mass fitting 14 from falling off is configured. In addition, when the dynamic damper 10 is mounted, the separation distance between the mass metal fitting 14 (main body block portion 40) and the vibration suppression target member 18 is made small so as not to contact when the vibration suppression target vibration is input. When the 16 is broken, the main body block portion 40 and the vibration suppression target member 18 are in contact with each other, so that the mass fitting 14 is prevented from falling off.

  Here, in the dynamic damper 10, since the protruding block portion 42 protrudes substantially straight above the center of gravity G of the main body block portion 40, a rotational moment around the center of gravity is generated even when the mass metal member 14 vibrates. And the moment of inertia can be kept small even if a swing occurs. Therefore, even if the mass metal fitting 14 is elongated in one direction as in the present embodiment, the risk that the mass metal fitting 14 and the support plate metal fitting 12 or the vibration suppression target member 18 will hit each other is reduced. The Accordingly, the mass of the mass metal fitting 14 can be set large, and the degree of freedom in tuning to the vibration frequency to be damped can be improved.

  Further, since the protruding block portion 42 of the mass metal fitting 14 is inserted into the opening hole 30 of the support plate metal fitting 12, the mass metal fitting 14 is effectively prevented from coming out of the support plate metal fitting 12, and such a simple structure is provided. A fail-safe mechanism is realized. In particular, the protruding block portion 42 constituting such a fail-safe mechanism is also effectively used as part of the mass of the mass metal fitting 14.

  In addition, post-processing is performed on the bonding surfaces 48 and 48 of the mass metal fitting 14 with the rubber elastic body 16 to reduce the surface roughness, thereby improving the bonding efficiency between the mass metal fitting 14 and the rubber elastic body 16. Therefore, the possibility that the mass metal member 14 and the rubber elastic body 16 are peeled and broken at the bonding surfaces 48 and 48 is reduced. Therefore, the risk of pulling out the mass fitting 14 from the support plate fitting 12 can be further reduced.

  In particular, since the fail-safe mechanism is realized with the simple structure as described above, the degree of freedom in designing the support plate fitting 12 and the mass fitting 14 can be improved. As a result, it is possible to adopt the gate-shaped support plate metal fitting 12 as in the present embodiment, and it is also possible to adopt the mass metal fitting 14 whose length dimension is larger than the dimension in the direction of the support plate metal fitting 12. It is also possible to set the mass of the metal fitting 14 larger.

  Furthermore, since the mass metal fitting 14 is formed of a cast product, the mass metal fitting 14 is more inexpensive than the mass metal fitting formed by extrusion molding or by cutting out a block-like metal fitting, and is inexpensive. Can be manufactured.

  Further, convex portions 46 and 46 are provided on both side surfaces in the width direction of the main body block portion 40, and the protruding front end surfaces of the convex portions 46 and 46 are formed as adhesive surfaces 48 and 48, and the mass member 14. The inclination angles are different from those of the outer peripheral surfaces other than the adhesive surfaces 48 and 48. Therefore, it is possible to set inclined surfaces according to vibration damping characteristics and the like on the bonding surfaces 48 and 48 and to remove the mold from the mold by attaching a punching taper to the outer peripheral surface other than the bonding surfaces 48 and 48. It is also possible to improve the performance.

  Furthermore, in the present embodiment, since the annular step portion 32 is provided at the peripheral portion of the opening hole 30 of the top plate portion 20, excellent rigidity is ensured even in the support plate fitting 12 using the press plate fitting. Is done. Thereby, in the single-piece | unit state before mounting | wearing with the dynamic damper 10, the possibility that the opening part of the support plate metal fitting 12 made into the gate shape may deform | transform, such as an expansion, may be reduced. Furthermore, it is possible to effectively prevent the support plate metal fitting 12 from being deformed by heat or the like during vulcanization of the rubber elastic body 12. Further, by providing the buffer rubber 54 at the peripheral portion of the opening hole 30, it is possible to effectively prevent the generation of noise when the mass fitting 14 is displaced in the vertical direction and hits the support plate fitting 12. .

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It is feasible in the form which added.

  For example, in the above-described embodiment, the projecting tip surfaces (adhesive surfaces 48, 48) of the convex portions 46, 46 have a planar shape that extends in a substantially vertical direction, but the convex portion 46, for example, as shown in FIG. , 46 may be provided with recesses 60, 60 that open outward. That is, in this embodiment, the recessed areas 60 and 60 are provided on the bonding surfaces 48 and 48, so that the bonding area can be improved. Further, it is possible to secure a larger rubber volume of the rubber elastic body 16, and the degree of freedom in tuning to the vibration frequency to be damped and the durability can be further improved. In particular, since the projecting tip surfaces of the projections 46 and 46 are post-processed surfaces, the recesses 60 and 60 can be easily formed by performing cutting or the like on the projecting tip surfaces of the projections 46 and 46. In addition, the design freedom of the shape of the recesses 60, 60 is ensured at a high level.

  In addition, the convex parts 46 and 46 as described in the embodiment and the mode shown in FIG. 7 are not essential, and the support surface to which the rubber elastic body 16 is bonded is continuous from the non-support surface (inclined surface 44). It may be a planar shape that extends, or a concave portion may be provided on the inclined surface 44 instead of the convex portion.

  Furthermore, in the said embodiment, although the damping target member 18 was provided so that the opening part of the support plate metal fitting 12 might be covered completely, you may make it cover the opening part of a support plate metal fitting partially. That is, a gap smaller than the width dimension of the mass member may be provided in the vibration damping target member. For example, even if the rubber elastic body is broken, the damping target member prevents the mass member from being pulled out from the support plate bracket. It only has to be adapted.

  Further, the directions such as up, down, left, and right described in the embodiment are not limited to the directions when the dynamic damper 10 according to the present invention is mounted.

  Furthermore, in the above embodiment, the covering rubber layer 52, the buffer rubber 54, and the covering rubber layer 56 are formed on the inclined surface 44 of the main body block portion 40, the peripheral portion of the opening hole 30 in the top plate portion 20, and the inner surface of the support plate fitting 12. However, in the present invention, these rubbers are not essential. That is, only the rubber elastic body 16 that elastically connects the support plate metal member 12 and the mass metal member 14 may be provided.

  In the embodiment, the dynamic damper for the automobile is described as the dynamic damper according to the present invention. However, the dynamic damper according to the present invention may be applied to other than the automobile.

10: Dynamic damper, 12: Support plate bracket, 14: Mass bracket, 16: Rubber elastic body, 18: Damping target member, 20: Top plate portion, 22: Leg plate portion, 30: Opening hole, 32: Stepped portion, 40: body block portion, 42: protruding block portion, 44: inclined surface (non-support surface), 46: convex portion, 48: adhesive surface (post-processed surface, support surface), 54: buffer rubber (buffer rubber for buffer) , 60: recess

Claims (6)

A mass bracket is elastically connected by a rubber elastic body to a support plate bracket having a portal plate structure in which a pair of leg plate portions are provided on both sides in the length direction of the top plate portion, and In the dynamic damper to which the support plate bracket is attached,
The mass metal fitting is a cast product, and a main body block portion disposed in an area surrounded by the support plate metal fitting, and a protruding block portion protruding from the central portion of the main body block portion toward the top plate portion, Are formed integrally, and an opening hole is formed in the top plate portion of the support plate metal fitting, and the protruding block portion of the mass metal fitting protrudes outward through the opening hole, Including a peripheral portion of the opening hole of the support plate metal fitting positioned around the protruding block portion in a mounted state in which the space between the leg plate parts on both sides of the support metal plate is covered with the vibration suppression target member; While the fail-safe mechanism for preventing the drop-off is configured, the opposing surface of the main body block portion to the both leg plate portions is a post-processed surface with reduced surface roughness, and the post-process Rubber elastic body on the surface Dynamic damper characterized in that it is bonded.   Compared to the support surface where the rubber elastic body is bonded to the outer peripheral surface of the main body block portion facing the both leg plate portions of the support plate metal fitting, the top plate portion is other than the support surface. 2. The dynamic damper according to claim 1, wherein the inclination angle in the projecting direction of the leg plate portion is different from each other, and the non-supporting surface is provided with a draft taper in which an outer peripheral dimension decreases downward.   A convex portion is formed on a portion of the outer peripheral surface of the main body block portion facing the both leg plate portions of the support plate metal fitting, and a protruding tip surface of the convex portion is the post-processed surface. The dynamic damper according to 1 or 2.   The recessed part is formed with respect to the support surface of the said main body block part to which the said rubber elastic body was adhere | attached facing the both said leg board part of the said support plate metal fitting. Dynamic damper.   The length dimension of the main body block portion is larger than the length dimension in the passing direction in the support plate metal fitting of the portal plate structure, and both side portions in the length direction of the main body block portion are the support plate metal fittings. The dynamic damper according to any one of claims 1 to 4, wherein the dynamic damper is disposed so as to protrude from a region surrounded by the two sides in a street direction.   An annular stepped portion is provided in the peripheral portion of the opening hole of the top plate portion in the support plate metal fitting, and the peripheral portion of the opening hole is in contact with the outer peripheral surface of the protruding block portion in the mass metal fitting. The dynamic damper according to any one of claims 1 to 5, wherein a buffer stopper rubber covering the opposing surface is fixed.

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