JP4624494B2 - Cylindrical dynamic damper and manufacturing method thereof - Google Patents

Description

  The present invention relates to a dynamic damper and a method of manufacturing the same, and more particularly to a cylindrical dynamic damper used by being inserted into a pipe disposed in a body of an automobile and a method of manufacturing the same. .

  Conventionally, various anti-vibration devices have been used in automobiles, and among them, in order to reduce that various mechanical components attached to the body vibrate due to vibration generated from a power unit or the like. A dynamic damper that absorbs and suppresses the vibration has been suitably used.

  As one of such dynamic dampers, a dynamic damper is attached to a drive shaft used in a power transmission system of an automobile to prevent the vehicle body from vibrating due to vibration generated in a power unit system such as an engine. The structure is adopted. For example, in Japanese Patent Laid-Open No. 5-149386 (Patent Document 1), a damper mass is coaxially disposed in a hollow hole of a drive shaft having a hollow structure with a predetermined gap with respect to an inner peripheral surface thereof. In addition, a structure in which a pair of support rubber elastic bodies are fixed to both axial ends of the damper mass, and the damper mass is connected to the drive shaft by the pair of support rubber elastic bodies to be elastically supported is disclosed. ing.

  Furthermore, in Japanese Patent Laid-Open No. 2002-235803 (Patent Document 2), bending resonance is generated in a propulsion shaft (propeller shaft) that constitutes a part of a power transmission system used in an FR vehicle, a 4WD vehicle, or the like. As a dynamic damper that is press-fitted to reduce, an inner pipe is placed inside a resin outer pipe, and these are elastically connected by a mounting rubber inside a resin mounting pipe that is fixed to the propeller shaft. A structure is shown in which an inner weight is press-fitted into the inner pipe so as to be press-fitted into the inner pipe and fixed, and arranged at the axial center of the mounting pipe. Furthermore, in Japanese Patent Application Laid-Open No. 2003-97633 (Patent Document 3), as in the case of Patent Document 2, as a dynamic damper attached to the propeller shaft, an inner weight is arranged on the axis of the outer pipe, A structure in which the outer pipe and the inner weight are elastically connected by fitting a mount rubber interposed between the outer pipe and the inner weight into an annular recess formed in the body portion of the inner weight. Things have been revealed.

  Also, in recent years, in order to achieve a more comfortable ride, vibrations have been absorbed and suppressed using dynamic dampers even for mechanical parts that have not previously been equipped with vibration isolation devices. For example, by pressing a dynamic damper into a pipe attached to a seat (seat), vibrations transmitted from the vehicle body side are absorbed to prevent the seat from resonating. Yes.

  However, even when a dynamic damper is attached at such a location, the dynamic damper as disclosed in Patent Documents 1 to 3 described above has various problems.

  For example, like the one described in Patent Document 1, the dynamic damper is attached to the pipe by press-fitting into the hollow hole of the pipe via the attachment portions in the supporting rubber elastic body fixed to both ends of the damper mass. When it is carried out by the method of attaching directly, since the positional relationship between the mounting portion of such a support rubber elastic body and the damper mass is not fixed, the force applied at the time of press-fitting into the pipe, Due to the deformation of the support rubber elastic body, the length changes, causing a problem that the damper mass and the support rubber elastic body are not arranged in a predetermined positional relationship. As a result, the damper characteristics of the dynamic damper The problem is that there is a change.

  Moreover, in the thing of patent document 2 and patent document 3, even when it reduces in size with the shape, the magnitude | size of the inner weight required in order to acquire sufficient vibration-proof performance, and the thickness of mount rubber are set. There are inherent problems that are difficult to secure. In addition, since the mount rubber that elastically connects the inner weight and the outer pipe is connected only at the substantially central portion in the axial direction, the inner weight is swung around the central portion in the axial direction. In some cases, the inner weight and the outer pipe may collide with each other to cause abnormal noise. Further, in Patent Document 2, an inner weight is press-fitted into a combination of two sets of assemblies in which an inner pipe and an outer pipe are connected by a rubber elastic body, thereby suppressing the movement in the deflection or bending direction. However, in such a case, the structure is complicated and causes problems such as deterioration in productivity and increase in cost.

JP-A-5-149386 JP 2002-235803 A JP 2003-97633 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that there is no fear that the shape and the damper characteristics will change even if inserted into a pipe. To provide a cylindrical dynamic damper and an effective manufacturing method thereof.

  In the present invention, in order to solve such a technical problem, a cylindrical dynamic damper that is inserted and fixed in a pipe to reduce vibration of the pipe is formed into a cylindrical shape at both ends. And a cylindrical holding member having rigidity, which is fixed to the inner peripheral surface of the pipe, and is positioned in the axial direction in the cylindrical holding member. A longitudinal mass member supported at both ends, and corresponding portions of both end portions of the mass member and the cylindrical portions at both ends of the cylindrical holding member are elastically connected to each other, and the mass A rubber elastic body at both ends for supporting the member only at both ends thereof, and the rubber elastic body is positioned at a predetermined distance from a corresponding end portion of the mass member, and the cylindrical holding member Fixed to the inner peripheral surface of the corresponding cylindrical part And a connecting portion that connects the supporting portion and a corresponding end portion of the mass member, and the cylindrical holding members are arranged at the cylinders at both ends. By connecting the shape portions with the two axisymmetric connecting portions, they are integrally formed, and further, the window portion is formed as a large opening between the circumferential directions of the two connecting portions. The rubber elastic body is formed by a vulcanization mold inserted through the molding cavity in a molding cavity corresponding to the outer shape of the rubber elastic body, so that the rubber elastic body has the mass member and the cylindrical holding member. The gist of the present invention is a cylindrical dynamic damper characterized by being formed as an integral vulcanized molded product.

  Moreover, according to one of the desirable aspects of the cylindrical dynamic damper according to this invention which solves this subject, the said cylindrical holding member is a rubber elastic body of predetermined thickness on the outer peripheral surface of the cylindrical part of the both ends. Each layer is integrally formed and configured.

  Furthermore, in another aspect according to the present invention, the connecting portion of the rubber elastic body wraps around the outer peripheral surface from the end surface of the mass member, and the thin rubber is formed on the outer peripheral surface of the end portion of the mass member. The cylindrical dynamic damper forming the layer is also a feature.

  In the present invention, in order to advantageously manufacture such a cylindrical dynamic damper, the cylindrical dynamic damper is inserted and fixed in the pipe to reduce the vibration of the pipe, and the cylinders at both ends are formed. And a rigid cylindrical holding member fixed to the inner peripheral surface of the pipe, and to be positioned in the axial direction within the cylindrical holding member. A longitudinal mass member supported at both ends, and corresponding portions of both end portions of the mass member and the cylindrical portions at both ends of the cylindrical holding member are elastically connected to each other, A rubber elastic body at both ends that supports the mass member only at both ends thereof, and the rubber elastic body is positioned at a predetermined distance from a corresponding end portion of the mass member, and the cylindrical holding member Corresponding cylindrical shape When manufacturing a structure having a disk-like support portion fixed to the inner peripheral surface of the disk, and a connection portion connecting the support portion and a corresponding end portion of the mass member, the cylinder The cylindrical holding member is integrally formed by connecting the cylindrical portions at both ends with the two axisymmetric connecting portions, and a window that opens widely between the circumferential directions of the two connecting portions. A vulcanization mold having a molding cavity that forms the outer shape of the rubber elastic body that connects the cylindrical holding member and the mass member through such a large opening window portion is formed as a cylindrical portion. The rubber material that forms the rubber elastic body is molded after being inserted into the holding member and set at a predetermined position of the mold so that the cylindrical holding member and the mass member are in predetermined positions, respectively. Such as a cylindrical holding member A method of manufacturing a cylindrical dynamic damper is adopted in which the rubber elastic body that integrally connects the cylindrical holding member and the mass member is formed by performing integral vulcanization molding with the support member. It will be.

  Thus, according to the cylindrical dynamic damper according to the present invention, the longitudinal mass member is elastically connected and supported via the rubber elastic body in the rigid cylindrical holding member. The rubber elastic body is not deformed by the pressure applied when the cylindrical dynamic damper is inserted into the pipe. Therefore, the distance between the mass member and the rubber elastic body changes, and the mass members are changed. Since there is no possibility that the positional relationship between the rubber elastic body and the rubber elastic body changes, the damper characteristics by the cylindrical dynamic damper are stably exhibited.

  In addition, in such a cylindrical dynamic damper, the mass member is connected to and supported by the opposite end portions of the cylindrical holding member at both ends thereof, thereby providing damper characteristics. In addition to easily reducing the size of the cylindrical dynamic damper without taking into account the change of the mass, and when vibration is applied in the run-out or twisting direction centering on the central portion of the mass member in the axial direction. However, there is a possibility that the mass member does not move or bend in the above-described direction, the end of the mass member may collide with the inner peripheral surface of the cylindrical holding member, and the generation of abnormal noise associated therewith. The problem will be resolved effectively.

  Further, according to the cylindrical dynamic damper according to the present invention, the disc-shaped support in which the rubber elastic body that couples the mass member and the cylindrical holding member is fixed to the inner peripheral surface of the cylindrical portion of the cylindrical holding member. And a connecting portion that connects the end portion of the mass member to the cylindrical dynamic damper having such a structure, in other words, in the direction perpendicular to the axis of the cylindrical holding member. When vibration is input in the direction perpendicular to the axis of the mass member, the elastic elastic body is deformed in the shearing direction at the above-described connecting portion, and thus soft spring characteristics can be exerted, so that low frequency vibration Therefore, effective damper characteristics can be exhibited. In addition, by increasing the diameter of the disk-shaped support part, the distance between the outer peripheral surface of the mass member and the inner peripheral surface of the cylindrical holding member is increased without affecting the spring characteristics of the rubber elastic body. Therefore, the possibility that the mass member and the inner surface of the cylindrical holding member collide can be effectively avoided.

  Furthermore, in such a cylindrical dynamic damper according to the present invention, the cylindrical holding members connect the cylindrical portions provided at both ends in the axial direction by two axially symmetric connecting portions, and the two While it is possible to reduce the weight while securing the strength of the cylindrical holding member in the axial direction, since the two window portions are formed so as to open greatly between the circumferential directions of the connecting portion, A vulcanization mold having a molding cavity that forms the outer shape of a rubber elastic body that connects the cylindrical holding member and the mass member is inserted into the cylindrical holding member through the window having a large opening. After setting the mold holding member and the mass member at predetermined positions, the rubber material for forming the rubber elastic body is filled into the molding cavity of the mold to form a cylindrical shape. Same as holding member and mass member By performing vulcanization molding, is a predetermined shape, it become possible to form a rubber elastic body integrally connected to the tubular holding member and the mass member.

  According to one of desirable aspects of the cylindrical dynamic damper according to the present invention, since the rubber elastic body layer having a predetermined thickness is formed on the outer peripheral surface of the cylindrical holding member, the cylindrical dynamic damper is When inserted into the pipe, it comes into contact with the pipe via the rubber elastic layer, and is elastically pressed and fixed to the inner surface of the pipe at the contact portion, and is inserted into the pipe. The rigidity required for this is only a small force that can compress the deformation of the rubber elastic layer and oppose the frictional force generated between the rubber elastic layer and the inner peripheral surface of the pipe. It is not necessary to press the cylindrical holding member having an excessive pressure that compresses and deforms to a size that can be inserted into the inner diameter of the pipe to be inserted. Therefore, when the cylindrical holding member is pressed into the pipe, Risk of deformation due to pressure It can be effectively avoided.

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

  First, FIG. 1 shows a cylindrical dynamic damper 10 according to the present invention in the form of a front view thereof, FIG. 2 shows the plan view thereof, and FIG. A cross-sectional view cut in a direction perpendicular to the axis at the axially central portion of the dynamic damper 10 is shown. As can be seen from these drawings, the cylindrical dynamic damper 10 includes an outer cylinder fitting 12 that is a cylindrical holding member and a mass fitting 14 that is disposed in the outer cylinder fitting 12 and has a cylindrical shape. The both ends corresponding to the axial direction are elastically connected to each other by integral vulcanization adhesion by the rubber elastic body 16.

  More specifically, the outer cylinder fitting 12 is formed from a rigid metal cylinder, and has a substantially cylindrical shape as a whole, in which a part of the cylindrical wall of the outer cylinder fitting 12 is formed. However, as shown in FIG. 1 and FIG. 2, the window portions 18 and 18 are respectively formed by being largely cut off at the axially symmetrical both side central portions. The window portions 18 and 18 are respectively formed with cylindrical portions 20 and 20 to which the rubber elastic body 16 is vulcanized and bonded to the inner peripheral surface at both axial end portions of the outer tube fitting 12. Further, the notch remaining portions of the cylindrical wall of the outer cylinder fitting 12 are formed as connecting portions 22 and 22, which are positioned axially symmetrically between the window portions 18 and 18 so as to connect the cylindrical portions 20 and 20. It has been done. In addition, the cylindrical part 20 is formed by reducing the diameter so as to be slightly smaller than the diameter of the connecting part 22 in the portion where the window part 18 is provided in the outer cylinder fitting 12.

  On the other hand, in such an outer cylinder fitting 12, the mass fitting 14 arranged in the axial direction is a solid long cylindrical shape formed of a metal material or the like, and the size thereof is the outer cylinder fitting. The outer diameter of the outer cylinder fitting 12 is shorter than the entire length of the outer cylinder fitting 12 so as to be displaceable within the outer diameter of the outer cylinder 12.

  And the rubber elastic body 16 which connects these outer cylinder metal fittings 12 and mass metal fittings 14 is the inner peripheral surface of the cylindrical part 20 formed in the edge part of the outer cylinder metal fittings 12 like sectional drawing shown by FIG. A disk-shaped support portion 24 fixed to the disk portion, and a connection portion 26 extending from a disk-shaped central portion of the support portion 22 and fixed to a corresponding end portion of the mass metal fitting 14. The portion 26 is connected to the axial end surface of the mass metal fitting 14 and wraps around the outer peripheral surface from the end surface of the mass metal fitting 14 to form a thin rubber layer 28. Further, the rubber elastic body material wraps around the outer peripheral surface of the cylindrical portion 20 at both ends of the outer cylinder fitting 12 from the inner rubber elastic body 16, and protrudes integrally with the rubber elastic body 16 over the entire circumference. 30 is continuously formed in the circumferential direction. In addition, the outer diameter of such a protrusion 30 is slightly larger than the outer diameter of the connecting portion 22 in the outer cylinder fitting 12. Further, such a rubber elastic body 16 can be formed by using a material appropriately selected according to a target vibration-proof performance from various known rubber materials. Various known vulcanizing agents, vulcanization accelerators and the like used in vulcanization molding are used as necessary.

  By the way, such a cylindrical dynamic damper 10 is manufactured by the following procedure, for example. First, a predetermined metal cylinder is processed to prepare an outer cylinder fitting 12 having a window portion 18 and a mass fitting 14, and vulcanized gold having a molding cavity for giving a rubber elastic body 16. Set in place on the mold. At this time, a part of the mold enters the outer cylinder fitting 12 through the window 18 provided in the outer cylinder fitting 12, and the end of the mass fitting 14 set in the outer cylinder fitting 12 and the outer cylinder The inner peripheral surface of the cylindrical portion 20 of the metal fitting 12 is set so as to appear at a predetermined position in the molding cavity for molding the rubber elastic body 16. Then, after filling the molding cavity with a rubber material and performing integral vulcanization molding, the obtained integral vulcanized molded product is released from the mold to obtain a target product, that is, an outer cylinder. A rubber elastic body 16 is integrally vulcanized and bonded to the corresponding end portions of the metal fitting 12 and the mass metal fitting 14 so that the outer cylinder metal fitting 12 and the mass metal fitting 14 are connected and elastically supported. The cylindrical dynamic damper 10 having a structure in which the rubber protrusions 30 formed over the entire circumference of the outer peripheral surface of the both ends of the outer cylinder fitting 12 are formed integrally with the rubber elastic body 16 is obtained. .

  When the cylindrical dynamic damper 10 thus obtained is inserted into a pipe that absorbs or suppresses the intended vibration, the outer cylinder is inserted from one end of the cylindrical dynamic damper 10. The flange-shaped rubber protrusion 30 formed on the outer peripheral surface of the metal fitting 12 is compressed and deformed so as to have a size corresponding to the inner diameter of the pipe to be inserted, and is pushed into the pipe. At that time, the cylindrical dynamic damper 10 is moved to a target position in the pipe by pressing the cylindrical portion 20 on the one end side of the outer cylindrical fitting 12. In this way, the cylindrical dynamic damper 10 has the rubber protrusions 30 formed on the outer peripheral surfaces at both ends thereof so that the pressure between the inner peripheral surface of the pipe to be attached and the outer peripheral surface of the outer cylindrical metal fitting 12 is reduced. By doing so, it is fixed at an arbitrary position in the pipe.

  As described above, in the cylindrical dynamic damper 10 according to the present invention, the rubber elastic bodies 16 and 16 fixed to both ends of the mass metal fitting 14 are provided with the cylindrical portions 20 formed at both ends of the highly rigid outer cylinder fitting 12. , 20 are vulcanized and bonded to the inner peripheral surface, and the outer cylinder fitting 12 and the mass fitting 14 are elastically connected and supported, and the mass fitting 14 is held by 12 different outer cylinder fittings. When the cylindrical dynamic damper 10 is inserted into the pipe to which it is attached, the rubber elastic body 16 is deformed by the applied pressure, and the positional relationship between the rubber elastic body 16 and the mass fitting 14 changes. There is no possibility that the damper characteristics of the cylindrical dynamic damper 10 will change.

  In addition, the cylindrical portions 20 and 20 formed at both ends of the outer cylinder fitting 12 and both ends of the mass fitting 14 are connected by a rubber elastic body 16 to be elastically supported. A rubber elastic body is arranged at the central portion in the axial direction between the inner peripheral surface of the conventional outer cylindrical metal fitting and the outer peripheral surface of the mass metal fitting, so that the distance between the outer peripheral surface of the metal fitting 12 and the inner peripheral surface of the mass metal fitting 14 is elastic. Therefore, the cylindrical dynamic damper 10 can be made smaller than the connected cylindrical dynamic damper, and the cylindrical dynamic damper 10 can be advantageously downsized. In addition, since the mass metal fitting 14 is elastically supported at both ends thereof as described above, the cylindrical dynamic damper 10 can be swung or twisted around the central portion in the axial direction of the mass metal fitting 14. Even when a vibration in the direction is applied, the mass metal fitting 14 does not cause the above-described vibration or the deflection in the bending direction. Therefore, the end portion of the mass metal fitting 14 and the inner circumference of the outer cylinder metal fitting 12 are not generated. Problems such as a desired damper characteristic not being exhibited and abnormal noise occurring due to collision with the surface are effectively eliminated.

  Further, a rubber elastic body 16 that connects corresponding ends of the end of the mass metal fitting 14 and the end of the outer cylindrical metal fitting 12 is a disk-shaped support portion 24 fixed to the inner peripheral surface of the cylindrical portion 20. When the vibration in the direction perpendicular to the axis of the mass fitting 14 is input to the cylindrical dynamic damper 10, the rubber is formed from the connection portion 26 that connects it to the end of the mass fitting 14. The elastic body 16 is sheared and deformed at the connection portion 26, so that a soft spring characteristic can be exhibited. As a result, the cylindrical dynamic damper 10 is effective against low-frequency vibrations. This makes it possible to exhibit damper characteristics. Further, in this case, by adjusting the size of the support portion 24, the outer cylindrical fitting 12 to which the rubber elastic body 16 is fixed without affecting the spring characteristics of the connection portion 26 that exhibits soft spring characteristics. Since it is possible to increase the diameter, the distance between the outer peripheral surface of the mass metal fitting 14 and the inner peripheral surface of the outer cylinder metal fitting 12 can be increased. The risk of collision with the inner peripheral surface can also be effectively avoided. Further, in such a connection portion between the rubber elastic body 16 and the mass metal fitting 14, the connection portion 26 wraps around to cover the entire end portion of the mass metal fitting 14, and a thin rubber layer 28 is formed. The vulcanization adhesion area between the body 16 and the mass metal fitting 14 can be increased, and they are bonded more firmly.

  Further, the outer cylindrical fitting 12 is formed by connecting the cylindrical portions 20 provided at both axial end portions thereof with two axially symmetric connecting portions 22 and 22, and in the circumferential direction of the two connecting portions 22 and 22. When the rubber elastic body 16 is vulcanized and molded into the outer tube fitting 12 through the window portion 18, since the two axially symmetric window portions 18 and 18 are configured to be opened widely. Since it becomes easy to insert and remove the mold to be used, and the desired cylindrical dynamic damper 10 can be easily obtained, the productivity can be advantageously improved.

  In the cylindrical dynamic damper 10 having the structure shown here, the rubber protrusion 30 is integrally formed with the rubber elastic body 16 on the outer peripheral surface of the end portion of the outer tube fitting 12. The force required when inserting the cylindrical dynamic damper 10 into the pipe causes the rubber protrusion 30 to be compressed and deformed between the outer peripheral surface of the outer cylindrical metal member 12 and the inner peripheral surface of the pipe to be inserted. Since a force large enough to resist the frictional force generated between the rubber protrusion 30 and the inner peripheral surface of the pipe is sufficient, the metal on the outer peripheral surface of the outer cylinder fitting 12 and the inner peripheral surface of the pipe are in direct contact with each other. Thus, it is possible to press-fit with a smaller force than in the case, and problems such as damage of the cylindrical dynamic damper 10 when inserted into the pipe are effectively eliminated. .

  As mentioned above, although one typical embodiment of the present invention has been described in detail, it is merely an example, and the present invention is interpreted in a limited manner by a specific description in such an embodiment. It should be understood that this is not the case.

  For example, in the above-described embodiment, by deforming the rubber elastic body 16 in the shear direction in response to vibration input, the rubber elastic body 16 can exhibit a soft spring characteristic, so that the cylindrical dynamic damper 10 is However, as shown in FIGS. 5 and 6, the rubber elastic body 46 is connected to the inner peripheral surface of the outer cylindrical metal member 42, as shown in FIGS. 5 and 6. The rubber elastic body 46 is configured so as to be interposed between the outer peripheral surface of the mass metal fitting 44 and when the vibration in the direction perpendicular to the axis of the mass metal fitting 44 is input, Of course, it is also possible to provide the cylindrical dynamic damper 40 that exhibits a vibration isolation effect by being compressed and deformed between the inner peripheral surface of the metal fitting 42. In these drawings, 48 is a window portion, 50 is a cylindrical portion, and 52 is a connecting portion.

  In addition, the rubber protrusions 30 are provided at both ends of the outer cylinder fitting 12, but the shape, axial length, and number of rubber layers formed on the outer peripheral surface of the outer cylinder fitting 12 are cylindrical dynamic. Depending on the pipe to be inserted and fixed, the damper is appropriately changed and formed. Further, such a rubber layer may not be formed like the cylindrical dynamic damper 40 shown in FIGS. 5 and 6, and the inner peripheral surface of the pipe into which the cylindrical dynamic damper is inserted and the outer cylindrical fitting 12. It is also possible to fix in the pipe by making direct contact with the outer peripheral surface of the pipe.

  In addition, in the embodiment illustrated in FIGS. 1 to 4, the outer diameter of the cylindrical portion 20 formed at both ends of the outer cylindrical fitting 12 is slightly smaller than the outer diameter of the connecting portion 22 of the outer cylindrical fitting 12. However, it is not essential to reduce the outer diameter of the cylindrical portion 20. In other words, the mold used when vulcanizing and molding the rubber elastic body 16 from the window portion 18 provided in the outer cylinder fitting 12 has a size that can easily enter and leave the outer cylinder fitting 12. It is good.

  In addition, although not listed one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

It is front explanatory drawing which shows an example of the cylindrical dynamic damper according to this invention. It is a plane explanatory view of the cylindrical dynamic damper shown in FIG. It is AA cross-section explanatory drawing in FIG. FIG. 3 is a cross-sectional explanatory view taken along line BB in FIG. 2. FIG. 5 is a cross-sectional explanatory diagram corresponding to FIG. 4 and showing a reference example of a cylindrical dynamic damper. FIG. 6 is a cross-sectional explanatory view of the cylindrical dynamic damper shown in FIG. 5 corresponding to FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cylindrical dynamic damper 12 Outer cylinder metal fitting 14 Mass metal fitting 16 Rubber elastic body 18 Window part 20 Cylindrical part 22 Connection part 24 Support part 30 Protrusion

Claims (4)

A cylindrical dynamic damper that is inserted and fixed in the pipe to reduce the vibration of the pipe,
A cylindrical holding member having rigidity, which is composed of a cylindrical portion at both ends and a connecting portion for connecting the cylindrical portions, and is fixed to the inner peripheral surface of the pipe, and is positioned in the axial direction within the cylindrical holding member As described above, the longitudinal mass members supported at both ends and the corresponding ones of the both end portions of the mass member and the tubular portions at both ends of the tubular holding member are elastically connected to each other. A rubber elastic body at both ends for supporting the mass member only at both ends thereof, and the rubber elastic body is positioned at a predetermined distance from a corresponding end of the mass member, A disk-shaped support portion fixed to the inner peripheral surface of the corresponding cylindrical portion of the shape holding member, and a connection portion that connects the support portion and a corresponding end portion of the mass member. And
The cylindrical holding member is integrally formed by connecting the cylindrical portions at both ends with the two axially symmetric connecting portions, and further, a large opening is provided between the circumferential directions of the two connecting portions. Formed as a window part,
The rubber elastic body is formed by a vulcanization mold inserted through the window portion, and the rubber elastic body is formed by integral vulcanization molding in a molding cavity corresponding to the outer shape of the rubber elastic body. A cylindrical dynamic damper characterized in that it is formed as an integrally vulcanized molded product with a holding member. 2. The cylindrical dynamic damper according to claim 1, wherein the cylindrical holding member integrally has a rubber elastic body layer having a predetermined thickness on outer peripheral surfaces of cylindrical portions at both ends thereof. The connection part in the said rubber elastic body goes around to an outer peripheral surface from the end surface of the said mass member, and forms the thin rubber layer in the outer peripheral surface of the end part of this mass member. Cylindrical dynamic damper. A cylindrical dynamic damper that is inserted and fixed in a pipe to reduce vibration of the pipe, and includes a cylindrical portion at both ends and a connecting portion that connects the cylindrical portions, and the inner peripheral surface of the pipe A rigid cylindrical holding member fixed to the longitudinal direction, a longitudinal mass member supported at both ends so as to be positioned in the axial direction in the cylindrical holding member, both ends of the mass member, and the cylindrical shape And a rubber elastic body at both ends for elastically connecting the corresponding ones of the cylindrical portions at both ends of the holding member to support the mass member only at both ends thereof, and the rubber A disc-shaped support portion that is positioned at a predetermined distance from a corresponding end portion of the mass member and fixed to an inner peripheral surface of the corresponding cylindrical portion of the cylindrical holding member; and A support and a corresponding end of the mass member In a connecting portion for connection to, the production of those composed,
The cylindrical holding member is integrally formed by connecting the cylindrical portions at both ends with the two axially symmetric connecting portions, and a large opening is provided between the circumferential directions of the two connecting portions. A vulcanizing mold having a molding cavity that forms an outer shape of the rubber elastic body that connects the cylindrical holding member and the mass member through the large-opened window portion. A rubber material that forms the rubber elastic body is inserted into the cylindrical holding member and set in a predetermined position of the mold so that the cylindrical holding member and the mass member are in predetermined positions, respectively. Forming the rubber elastic body integrally connecting the cylindrical holding member and the mass member by filling the molding cavity and integrally vulcanizing the cylindrical holding member and the mass member. Characteristic cylindrical dyna Method of manufacturing a Kkudanpa.

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