JP4471908B2 - Vibration isolator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a vibration isolator and a manufacturing method thereof.

  Conventionally, for example, a vibration isolator used as a suspension bush for an automobile is known (see, for example, Patent Documents 1 and 2).

  The vibration isolator of Patent Documents 1 and 2 includes a metal inner cylindrical body, a resin outer cylindrical body provided coaxially with the inner cylindrical body on the outer periphery of the inner cylindrical body, and a space between the two cylindrical bodies. And a rubber elastic body for connecting both cylinders to each other.

  Hereinafter, the manufacturing method of these vibration isolator is shown. First, the inner cylinder is set in a cavity of a rubber injection mold, and in that state, rubber is injected and filled, and the rubber injection mold is heated. After rubber vulcanization, the rubber injection mold is released. Thereby, the rubber elastic body is injection-molded, and a molded product including the inner cylinder body and the rubber elastic body is manufactured. Next, the molded product is set in the cavity of the resin injection mold, and in this state, the resin is injected and filled in the cavity, and the resin injection mold is cooled. After the resin is solidified, the resin injection mold is released. Thereby, an outer cylinder is injection-molded and a vibration isolator is produced.

Here, the rubber elastic body is pre-compressed in the direction orthogonal to the cylinder axis (direction orthogonal to the cylinder axis direction) by the injection molding pressure (injection pressure) of the resin, and durability is improved.
JP 49-46155 A Japanese Utility Model Publication No. 5-75537

  However, in the above vibration isolator, the shape of the rubber elastic body tends to become unstable due to the pre-compression by the injection molding pressure of the resin.

  The present invention has been made in view of the above points, and an object thereof is to provide an inner cylindrical body and a resin outer cylindrical body provided coaxially with the inner cylindrical body on the outer periphery of the inner cylindrical body. And a method for manufacturing the same, and a technique for improving the stability of the shape of the rubber elastic body. There is to do.

  According to a first aspect of the present invention, an inner cylindrical body, a resin-made outer cylindrical body provided coaxially with the inner cylindrical body on the outer periphery of the inner cylindrical body, and the two cylindrical bodies are provided between the two cylindrical bodies. And a rubber elastic body that connects the rubber elastic bodies to each other. At least one hole portion is provided on at least part of the cylinder circumferential direction at both ends in the cylinder axial direction of the rubber elastic body. And at least one hole at each end in the cylinder axial direction of the rubber elastic body is provided with at least one resin spring body formed integrally with the outer cylinder body in at least a part of the cylinder circumferential direction. At least the outer cylinder body and the spring bodies constitute a resin body, and the resin body is divided into a plurality of parts in the cylinder axis direction, and is composed of the plurality of divided bodies. It is characterized by.

  Accordingly, at least the outer cylinder body and each spring body constitute a resin body, and the resin body is divided into a plurality of parts in the cylinder axis direction, and is formed of the plurality of divided bodies. After that, by setting the inner cylinder and each divided body in a cavity of a rubber injection mold, in that state, the rubber is injected and filled, and the rubber injection mold is heated, An anti-vibration device can be made by injection molding a rubber elastic body. At this time, since the rubber elastic body is injection-molded after the plurality of divided bodies are molded, the rubber elastic body is not pre-compressed in the direction perpendicular to the cylinder axis by the resin injection molding pressure. Therefore, the stability of the shape of the rubber elastic body can be improved.

  A second invention is characterized in that, in the first invention, the resin body is divided into two in the cylinder axis direction, and comprises the first and second divided bodies.

  Thereby, the optimal form of this invention is realizable.

  According to a third invention, in the second invention, the concave portion extends over the entire circumference in the cylinder circumferential direction on the inner axial end surface of the outer cylinder of one of the first and second divided bodies. A convex portion is provided over the entire circumference in the cylinder circumferential direction at a portion corresponding to the concave portion on the inner axial end surface of the outer cylinder of the other divided body. To do.

  Thereby, the recessed part is provided in the cylinder axial direction inner side end surface of the outer cylinder body of one division body among the 1st and 2nd division bodies over the perimeter of a cylinder circumferential direction, and the outer cylinder of the other division body Since the convex part is provided in the part corresponding to the recessed part in the cylindrical axial direction inner side end surface of the body, the recessed part and the convex part can be fitted together. Therefore, before setting the first and second divided bodies in the cavity of the rubber injection mold, the first and second divided bodies can be set in the cavity in a pre-combined state by performing the fitting. . Therefore, the first and second divided bodies can be easily set in the cavity.

  A fourth invention is characterized in that, in the second invention, a predetermined distance is provided between inner end surfaces in the cylinder axis direction of the outer cylinders of the first and second divided bodies. is there.

  As a result, a predetermined gap is provided between the inner end surfaces of the outer cylinders of the first and second divided bodies in the cylinder axial direction, so that the rubber injection mold is an upper mold, a lower mold, and a rubber. In the case of having an intermediate mold disposed between the two molds at the time of injection molding of the elastic body, at the time of injection molding of the rubber elastic body, the inner mold is the first and second divided bodies between the two molds. It can arrange | position so that it may be pinched | interposed between the cylinder axial direction inner side end surfaces of this outer cylinder body. Therefore, at the time of injection molding of the rubber elastic body, the rubber injected into the cavity of the rubber injection mold and the middle mold can be brought into contact with each other. Therefore, heat can be sufficiently transferred to the rubber injected and filled into the cavity through the middle mold. Therefore, the thermal conductivity to the rubber injected and filled in the cavity can be improved.

  According to a fifth invention, in any one of the first to fourth inventions, the hole is provided at each end in the cylinder axis direction of the rubber elastic body over the entire circumference in the cylinder circumferential direction. The spring body is composed of a single spring body that is provided over the entire circumference in the cylinder circumferential direction at the hole at each end in the cylinder axial direction of the rubber elastic body. It is characterized by this.

  Thereby, the optimal form of this invention is realizable.

  According to a sixth invention, in any one of the first to fifth inventions, the resin body is provided with at least one through-hole penetrating in the thickness direction. .

  Accordingly, since at least one through hole penetrating in the thickness direction is provided in the resin body, the rubber injection injection hole for injecting the rubber into the resin body at the time of injection molding of the rubber elastic body. Or used as a rubber deficiency confirmation hole for confirming whether rubber is deficient.

  According to a seventh invention, in any one of the first to sixth inventions, at least one end portion of the rubber elastic body in the cylinder axial direction is integrally formed with the rubber elastic body. The stopper rubber elastic body is provided so as to protrude outward in the cylinder axis direction.

  Thereby, since the stopper rubber elastic body molded integrally with the rubber elastic body is provided at at least one of the both ends in the cylinder axial direction of the rubber elastic body so as to protrude outward in the cylinder axis direction. By the stopper rubber elastic body, relative movement in the cylinder axis direction of both cylinders can be restricted.

  An eighth invention is a method of manufacturing the vibration isolator according to the first invention, wherein the step of molding the plurality of divided bodies, and the inner cylinder body and each of the divided bodies are molded into a rubber injection mold. And a step of injecting and filling rubber into the cavity in this state and heating the rubber injection mold to injection-mold the rubber elastic body. To do.

  Thus, after molding a plurality of divided bodies, the inner cylinder body and each divided body are set in a cavity of a rubber injection mold, and in that state, rubber is injected and filled, and rubber injection molding is performed. The rubber elastic body is injection-molded by heating the metal mold. At this time, since the rubber elastic body is injection-molded after the plurality of divided bodies are molded, the rubber elastic body is not pre-compressed in the direction perpendicular to the cylinder axis by the resin injection molding pressure. Therefore, the stability of the shape of the rubber elastic body can be improved.

  In a ninth aspect based on the eighth aspect, the resin body is divided into two parts in the cylinder axis direction, and is composed of first and second divided parts. At the time of injection molding of the mold, the lower mold, and the rubber elastic body, the inner peripheral portion is sandwiched between the molds between the inner end surfaces in the cylinder axial direction of the outer cylinder bodies of the first and second divided bodies. It has a middle size arranged in the.

  As a result, the rubber injection molding die is a cylinder of an outer cylindrical body having an inner peripheral portion between the two molds when the upper mold, the lower mold, and the rubber elastic body are injection molded. The middle mold is disposed so as to be sandwiched between the inner end faces in the axial direction, so that the rubber injected into the cavity of the rubber injection mold and the middle mold are in contact with each other when the rubber elastic body is injection molded. Can be in a state. Therefore, heat can be sufficiently transferred to the rubber injected and filled into the cavity through the middle mold. Therefore, the thermal conductivity to the rubber injected and filled in the cavity can be improved.

  According to the present invention, after molding a plurality of divided bodies, the inner cylinder and each divided body are set in a cavity of a rubber injection mold, and in that state, the rubber is injected and filled, Since the rubber elastic body is injection-molded by heating the rubber injection molding die, the rubber elastic body is not pre-compressed in the direction perpendicular to the cylinder axis by the resin injection molding pressure. Therefore, the stability of the shape of the rubber elastic body can be improved.

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

(Embodiment 1)
1 is a plan view of a vibration isolator 10 according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. The vibration isolator 10 is used as a suspension bush for an automobile. The vibration isolator 10 includes a hollow cylindrical metal inner cylinder 11, a hollow cylindrical outer cylinder 12 disposed coaxially with the inner cylinder 11 on the outer periphery of the inner cylinder 11, and A rubber elastic body 13 is provided between the cylinders 11 and 12 and connects the cylinders 11 and 12 to each other.

  The outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of the rubber elastic body 13 are in a bonded state in which they are bonded to each other with an adhesive. The outer cylinder body 12 is made of resin and is press-fitted and fixed in a cylinder portion 14 (shown only in FIG. 2) of the suspension link. The material of the rubber elastic body 13 is natural rubber, for example.

  On the both end surfaces of the rubber elastic body 13 in the cylinder axis direction, one curling portion 15 as a hole opening toward the outside in the cylinder axis direction is disposed. Each curling portion 15 is provided continuously over the entire circumference in the cylinder circumferential direction near the inner cylinder 11 at each end in the cylinder axis direction of the rubber elastic body 13. That is, each of the straight portions 15 is formed in an annular shape when viewed in the cylinder axis direction at portions facing each other in the cylinder axis direction at each end in the cylinder axis direction of the rubber elastic body 13. Each curling portion 15 extends from each end surface in the cylinder axis direction of the rubber elastic body 13 to the vicinity of the central portion in the cylinder axis direction. Each curling portion 15 is provided at each end of the rubber elastic body 13 in the cylinder axis direction so that the distance from the outer peripheral surface of the inner cylinder 11 increases from the inner side to the outer side in the cylinder axis direction. That is, each straight portion 15 is formed to expand outward in the cylinder axis orthogonal direction (direction orthogonal to the cylinder axis direction, cylinder radial direction) as it goes from the inside in the cylinder axis direction to the outside.

  One spring body 16 made of resin is disposed at both ends of the outer cylinder body 12 in the cylinder axis direction. Each spring body 16 is injection-molded integrally with the outer cylinder body 12. The material of each of the spring bodies 16 and the outer cylinder body 12 is, for example, acylamide, polyamide, nylon, PPO (polyphenylene oxide), polyester, or the like.

  Each spring body 16 has a lid portion 17 that covers a part of each end surface of the rubber elastic body 13 in the cylinder axis direction, and an embedded portion 18 embedded in each straight portion 15.

  Each lid portion 17 is integrally provided at each end of the outer cylindrical body 12 in the cylinder axis direction. Each lid portion 17 is formed in an annular shape when viewed in the cylinder axis direction, and is disposed on the outer peripheral portion of the straight portion 15 on each end surface in the cylinder axis direction of the rubber elastic body 13. The inner surface in the cylinder axis direction of each lid portion 17 and each end surface in the cylinder axis direction of the rubber elastic body 13 are in a non-adhered state that are not bonded to each other with an adhesive.

  Each embedded portion 18 is integrally provided on the inner peripheral portion of each lid portion 17. Each buried portion 18 is provided in each straight portion 15 over the entire circumference in the cylinder circumferential direction and over the entire area in the cylinder axis direction. That is, each embedded portion 18 is provided so as to block all of the straight portions 15. Each embedded portion 18 is formed to match the shape of each straight portion 15. That is, each embedded portion 18 is formed in a hollow truncated cone (hollow substantially cylindrical) shape that expands outward in the cylinder axis orthogonal direction from the inner side in the cylinder axis direction toward the outer side. The outer surface of each embedded portion 18 and each straight portion 15 are in a non-bonded state.

  The outer cylindrical body 12 and each spring body 16 constitute a resin body 19. The resin body 19 is equally divided into two in the cylinder axis direction, and includes first and second divided bodies 20 and 21. That is, the outer cylinder body 12 is divided into two equal parts in the cylinder axis direction, and each spring body 16 is not divided in the cylinder axis direction. The first and second divided bodies 20 and 21 are substantially the same. One spring body 16 is disposed on each outer end of the outer cylinder 12 of the first and second divided bodies 20 and 21 in the cylinder axis direction.

-Manufacturing method of vibration isolator-
Hereinafter, the manufacturing method of the vibration isolator 10 of this embodiment is demonstrated, referring FIG.

  First, resin is injected and filled into a cavity of a resin injection mold (not shown) through a predetermined resin injection injection hole, and the resin injection mold is cooled. After the resin is solidified, the resin injection mold is released. Thereby, one divided body 20 is injection-molded. Another divided body 21 is formed by the same method (see FIG. 3A).

  Next, an adhesive is applied to the outer peripheral surface of the inner cylinder 11.

  Next, the inner cylindrical body 11 and the two divided bodies 20 and 21 are set in a cavity of a rubber injection mold (not shown), and in this state, rubber is injected into the cavity via a predetermined rubber injection injection hole. The rubber injection mold is heated by injection and filling. After rubber vulcanization, the rubber injection mold is released. Thereby, as shown in FIG.3 (b), the rubber elastic body 13 is injection-molded and the vibration isolator 10 is produced.

-Effect-
As described above, according to the present embodiment, after the two divided bodies 20 and 21 are molded, the inner cylindrical body 11 and the respective divided bodies 20 and 21 are set in the cavity of the rubber injection mold, and in this state. The rubber elastic body 13 is injection molded by injecting and filling rubber into the cavity and heating the rubber injection mold. At this time, since the rubber elastic body 13 is injection-molded after the two divided bodies 20 and 21 are molded, the rubber elastic body 13 is not pre-compressed in the direction perpendicular to the cylinder axis by the resin injection molding pressure. Therefore, the stability of the shape of the rubber elastic body 13 can be improved.

(Embodiment 2)
The present embodiment is different from the first embodiment in that a plurality of through holes 22,... Penetrating in the thickness direction are provided in the resin body 19. Hereinafter, the difference will be described.

  As shown in FIG. 4, a plurality of through holes 22,... Are formed in the lid portion 17 of the spring body 16 of the first and second divided bodies 20 and 21 (in FIG. 4, the first divided body 20. Only the through-hole 22 is shown). Each through-hole 22 of the first divided body 20 and each through-hole 22 of the second divided body 21 are respectively disposed in mutually opposing portions of the resin body 19 in the cylinder axis direction. Each through hole 22 of one of the first and second divided bodies 20, 21 serves as a rubber injection injection hole for injecting and injecting rubber into the resin body 19 when the rubber elastic body 13 is injection molded. Each of the through holes 22 of the other divided body 21 is used to confirm whether or not the rubber is insufficient by checking whether or not the rubber is out of each hole 22 at the time of injection molding of the rubber elastic body 13. It is used as a rubber shortage confirmation hole. As described above, the through holes 22 of the first divided body 20 and the through holes 22 of the second divided body 21 function as the rubber injection injection hole and the rubber shortage confirmation hole, respectively. Thus, the resin body 19 is arranged in a well-balanced manner.

-Effect-
As described above, according to the present embodiment, since the resin body 19 is provided with the plurality of through holes 22 penetrating in the thickness direction, the through holes 22,. It can be used as a rubber injection injection hole for injecting rubber into the resin body 19 or as a rubber shortage confirmation hole for confirming whether the rubber is insufficient.

  In the present embodiment, a plurality of through holes 22,... Are formed in the resin body 19, but at least one through hole 22 may be formed.

  In the present embodiment, the plurality of through holes 22 are formed in the lid portion 17 of the spring body 16 of the first and second divided bodies 20 and 21, respectively. As shown in FIG. 5, a plurality of through holes 22,... May be formed in the embedded portions 18 of the spring bodies 16 of the first and second divided bodies 20, 21 respectively.

(Embodiment 3)
As shown in FIG. 6, in the present embodiment, a concave portion 23 recessed in the cylinder axial direction is continuously provided over the entire circumference in the cylinder circumferential direction on the inner end surface in the cylinder axial direction of the outer cylindrical body 12 of the first divided body 20. In the portion corresponding to the concave portion 23 on the inner end surface of the outer cylindrical body 12 of the second divided body 21, the convex portion 24 protruding in the cylindrical axial direction is provided on the entire circumference in the cylindrical circumferential direction. The convex portion 24 is fitted into the concave portion 23. In other respects, the configuration is almost the same as that of the first embodiment.

-Manufacturing method of vibration isolator-
Hereinafter, the manufacturing method of the vibration isolator 10 of this embodiment is demonstrated.

  First, resin is injected and filled into the cavity of the first resin injection mold, and the first resin injection mold is cooled. After the resin is solidified, the first resin injection mold is released. Thereby, the 1st division body 20 is injection-molded.

  Next, resin is injected and filled into the cavity of the second resin injection mold, and the second resin injection mold is cooled. After the resin is solidified, the second resin injection mold is released. Thereby, the 2nd division body 21 is injection-molded.

  Next, an adhesive is applied to the outer peripheral surface of the inner cylinder 11.

  Next, the recessed part 23 of the 1st division body 20 and the convex part 24 of the 2nd division body 21 are mutually fitted, and the 1st division body 20 and the 2nd division bodies 20 and 21 are mutually combined.

  Next, the inner cylinder 11 and the first and second divided bodies 20 and 21 combined in advance are set in a cavity of a rubber injection mold, and rubber is injected and filled into the cavity in that state. The rubber injection mold is heated. After rubber vulcanization, the rubber injection mold is released. Thereby, the rubber elastic body 13 is injection-molded, and the vibration isolator 10 is produced.

-Effect-
As described above, according to the present embodiment, the concave portion 23 is formed on the entire inner circumference in the cylinder circumferential direction on the inner end surface in the cylinder axis direction of the outer cylinder 12 of one of the first and second divided bodies 20 and 21. Since the convex portion 24 is provided over the entire circumference in the cylinder circumferential direction at the portion corresponding to the concave portion 23 on the inner axial end surface of the outer cylinder 12 of the other divided body 21. The concave portion 23 and the convex portion 24 can be fitted to each other. Therefore, before setting the first and second divided bodies 20 and 21 in the cavity of the rubber injection mold, the first and second divided bodies 20 and 21 are combined in advance by fitting them together. Can be set in that cavity. Therefore, the 1st and 2nd division bodies 20 and 21 can be easily set in the cavity.

  In the present embodiment, the recess 23 is provided on the inner end surface in the cylinder axis direction of the outer cylinder 12 of the first divided body 20, and the protrusion 24 is provided on the inner end surface in the cylinder axis direction of the outer cylinder 12 of the second divided body 21. Is provided on the inner end surface in the cylinder axial direction of the outer cylindrical body 12 of the second divided body 21, and the convex portion 24 is provided on the inner end surface in the cylindrical axial direction of the outer cylindrical body 12 of the first divided body 20. It may be provided.

(Embodiment 4)
This embodiment is different from the first embodiment in that stopper rubber elastic bodies 25 are provided at both ends of the rubber elastic body 13 in the cylinder axis direction. Hereinafter, the difference will be described.

  As shown in FIG. 7, each spring body 16 is embedded near the outer cylinder body 12 in each end portion in the cylinder axis direction of the rubber elastic body 13. The opening angle of each spring body 16 with respect to the cylinder axis direction is larger than that of the first embodiment. The length of each spring body 16 in the cylinder axis direction is shorter than that of the first embodiment.

  A plurality of through holes 22,... Are formed in the spring bodies 16 of the first and second divided bodies 20, 21, respectively.

  Stopper rubber elastic bodies 25 formed integrally with the rubber elastic body 13 are disposed at both ends in the cylinder axial direction of the rubber elastic body 13 over the entire circumference in the cylinder circumferential direction. Each stopper rubber elastic body 25 is disposed on the outer surface in the cylinder axis direction of the lid portion 17 of the spring body 16 of each of the divided bodies 20 and 21 so as to protrude outward in the cylinder axis direction.

  In FIG. 7, the cylinder portion 14 of the suspension link is not shown.

-Manufacturing method of vibration isolator-
Hereinafter, the manufacturing method of the vibration isolator 10 of this embodiment is demonstrated.

  First, resin is injected and filled into the cavity of the resin injection mold, and the resin injection mold is cooled. After the resin is solidified, the resin injection mold is released. Thereby, one divided body 20 is injection-molded. In the same manner, another divided body 21 is formed.

  Next, an adhesive is applied to the outer peripheral surface of the inner cylinder 11.

  Next, the inner cylinder 11 and the two divided bodies 20 and 21 are set in a cavity of a rubber injection mold, and in this state, rubber is injected and filled into the cavity. Heat. After rubber vulcanization, the rubber injection mold is released. Thereby, the rubber elastic body 13 and the stopper rubber elastic body 25 are injection-molded integrally, and the vibration isolator 10 is produced.

-Effect-
As described above, according to the present embodiment, the stopper rubber elastic body 25 formed integrally with the rubber elastic body 13 is provided at both ends of the rubber elastic body 13 in the cylinder axis direction so as to protrude outward in the cylinder axis direction. Therefore, the stopper rubber elastic body 25 can restrict the relative movement of the cylinders 11 and 12 in the cylinder axis direction.

  In this embodiment, the stopper rubber elastic body 25 is disposed at both ends of the rubber elastic body 13 in the cylinder axis direction. However, the stopper rubber elastic body 25 is provided at one end of the rubber elastic body 13 in the cylinder axis direction. May be provided.

(Embodiment 5)
In the present embodiment, the configuration of the rubber injection mold 26 is different from that of the first embodiment. Hereinafter, the difference will be described.

  Each curling portion 15 opens toward the outer cylinder 12 on each end surface in the cylinder axis direction of the rubber elastic body 13 (see FIG. 8). The opening angle of the embedded portion 18 of each spring body 16 with respect to the cylinder axis direction is larger than that of the first embodiment. The length of the embedded portion 18 of each spring body 16 in the cylinder axis direction is shorter than that of the first embodiment.

  Between the inner end surfaces of the outer cylinder 12 of the first and second divided bodies 20 and 21 in the cylinder axial direction, there is a predetermined interval having a size substantially the same as the length (thickness) of the middle die 26c in the cylinder axis direction. Open (see FIG. 8). In other words, the notch portion 27 is provided in the central portion of the outer cylindrical body 12 in the cylinder axis direction over the entire circumference in the cylinder circumferential direction.

-Manufacturing method of vibration isolator-
Hereinafter, the manufacturing method of the vibration isolator 10 of this embodiment is demonstrated, referring FIG.

  Here, the rubber injection mold 26 of the present embodiment is recessed in the cylinder axis direction and provided with a circular recess in a part of the opening cross section, and rubber molding is performed on one side of the rubber elastic body 13 in the cylinder axis direction. When the rubber elastic body 13 is molded with a rubber, the upper mold 26a is disposed so as to face the upper mold 26a, and a concave portion having a circular shape in which a part of the opening cross-section is recessed in the cylinder axis direction, In addition, when the rubber elastic body 13 is molded with a rubber, the lower mold 26b for molding the other side of the rubber elastic body 13 in the cylinder axis direction is disposed between the two molds 26a and 26b and penetrates in the cylinder axis direction. And an intermediate mold 26c provided with an opening having a circular opening cross section. The opening sectional area of the upper mold 26a and the lower mold 26b is larger than the opening sectional area of the middle mold 26c. That is, the inner diameters of the upper mold 26a and the lower mold 26b are larger than the inner diameter of the middle mold 26c.

  First, resin is injected and filled into the cavity of the resin injection mold, and the resin injection mold is cooled. After the resin is solidified, the resin injection mold is released. Thereby, one divided body 20 is injection-molded. In the same manner, another divided body 21 is formed.

  Next, an adhesive is applied to the outer peripheral surface of the inner cylinder 11.

  Next, the inner cylinder 11 and the two divided bodies 20 and 21 are set in the cavity of the rubber injection mold 26. At this time, the middle mold 26c is disposed so that the inner peripheral portion is interposed between the inner end surfaces in the cylinder axis direction of the outer cylinder 12 of the two divided bodies 20 and 21. In this state, the cavity is injected and filled with rubber, and the rubber injection mold 26 is heated. After rubber vulcanization, the rubber injection mold 26 is released. Thereby, the rubber elastic body 13 is injection-molded, and the vibration isolator 10 is produced.

-Effect-
As described above, according to the present embodiment, the rubber injection mold 26 has the inner peripheral portion between the upper mold 26a, the lower mold 26b, and the rubber elastic body 13 during the injection molding. Has a middle die 26c disposed so as to be sandwiched between inner end surfaces in the cylinder axial direction of the outer cylindrical body 12 of the first and second divided bodies 20, 21, so that the rubber injection is performed during the injection molding of the rubber elastic body 13. The rubber injected and filled in the cavity of the molding die 26 and the middle die 26c can be brought into contact with each other. Therefore, heat can be sufficiently transferred to the rubber injected and filled into the cavity through the middle die 26c. Therefore, the thermal conductivity to the rubber injected and filled in the cavity can be improved.

(Other embodiments)
In each of the above-described embodiments, the vibration isolator 10 is used as a suspension bush for an automobile. However, the present invention is not limited to this. It can be applied to such bushes.

  Moreover, in each said embodiment, although the inner cylinder 11 is a metal thing, it is not restricted to this, For example, a resin thing may be sufficient.

  Further, in each of the above embodiments, the straight portion 15 is provided at each end in the cylinder axial direction of the rubber elastic body 13 over the entire circumference in the cylinder circumferential direction, and the spring body 16 is provided on the cylinder axis of the rubber elastic body 13. The end portions of the rubber elastic body 13 are provided at the end portions in the cylinder circumferential direction, but at least one edge portion 15 is provided at each end portion in the cylinder axis direction of the rubber elastic body 13 in at least a part of the cylinder circumferential direction. It is sufficient to provide at least one spring body 16 over at least a part in the cylinder circumferential direction on at least one straight part 15 at each end in the cylinder axis direction of the rubber elastic body 13.

  Further, in each of the above embodiments, the straight portion 15 is provided at each end in the cylinder axis direction of the rubber elastic body 13 so that the distance from the outer peripheral surface of the inner cylinder 11 increases from the inside toward the outside in the cylinder axis direction. However, the present invention is not limited to this. For example, the distance from the outer peripheral surface of the outer cylinder 12 may be the same from the inner side to the outer side in the cylinder axis direction.

  Moreover, in each said embodiment, although the rubber elastic body 13 is provided between the outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of each spring body 16, the rubber elastic body 13 does not need to be provided. That is, a space portion may be formed between the outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of the embedded portion 18 of each spring body 16. Furthermore, when the rubber elastic body 13 is not provided, each spring body 16 may be brought into contact with the outer peripheral surface of the inner cylindrical body 11.

  Moreover, in each said embodiment, although the outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of the rubber elastic body 13 are made into the adhesion state, you may make it into a non-adhesion state.

  Moreover, in each said embodiment, the cylinder axial direction inner surface of the cover part 17 of each spring body 16 and each cylinder axial direction end surface of the rubber elastic body 13 are made into a non-adhesion state, and the embedding part 18 of each spring body 16 is made. Although the outer surface and each of the straight portions 15 are not bonded, they may be bonded.

  Moreover, in each said embodiment, although the 1st and 2nd division bodies 20 and 21 are substantially the same thing or the approximate thing, they may differ. For example, the first and second divided bodies 20 and 21 may have different lengths in the cylinder axis direction of the outer cylinder 12.

  Moreover, in each said embodiment, although the resin body 19 consists of the 1st and 2nd division bodies 20 and 21, it may consist of not only this but three or more division bodies. In this case, it is preferable to provide the spring bodies 16 in the two divided bodies located on the outermost sides in the cylinder axis direction.

  Moreover, in each said embodiment, although the outer cylinder body 12 and each spring body 16 comprise the resin body 19, at least the outer cylinder body 12 and each spring body 16 should just comprise the resin body 19. FIG. That is, in addition to the outer cylindrical body 12 and each spring body 16, other resin-made constituent bodies may also form the resin body 19. However, this structure needs to be formed integrally with the outer cylinder 12 and each spring body 16.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is provided between the inner cylinder, the resin outer cylinder provided coaxially with the inner cylinder on the outer periphery of the inner cylinder, and both the cylinders, It is useful for a vibration isolator provided with a rubber elastic body that connects the two cylinders to each other.

It is a top view of the vibration isolator which concerns on Embodiment 1 of this invention. It is sectional drawing of the II-II line of FIG. It is a figure which shows the process of the manufacturing method of the vibration isolator which concerns on Embodiment 1, (a) is a figure which shows the process of injection molding of a resin body, (b) shows the process of injection molding of a rubber elastic body. FIG. 6 is a perspective cross-sectional view of a divided body according to Embodiment 2. FIG. It is a perspective sectional view of the modification of FIG. It is sectional drawing cut | disconnected in the direction orthogonal to the cylinder circumferential direction of the division body which concerns on Embodiment 3. FIG. It is a figure equivalent to FIG. 2 of the vibration isolator which concerns on Embodiment 4. FIG. It is a figure which shows the state of arrangement | positioning of the metal mold | die for rubber injection molding in the process of injection molding of the rubber elastic body of the vibration isolator which concerns on Embodiment 5. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Inner cylinder 12 Outer cylinder 13 Rubber elastic body 14 Suspension link cylinder 15 Straight part (hole)
16 Spring body 17 Lid portion 18 Buried portion 19 Resin body 20 First divided body 21 Second divided body 22 Through hole 23 Recessed portion 24 Convex portion 25 Stopper rubber elastic body 26 Rubber injection mold 26a Upper die 26b Lower die 26c Middle die

Claims (9)

An inner cylinder, a resin-made outer cylinder provided coaxially with the inner cylinder on the outer periphery of the inner cylinder, and a rubber elasticity provided between the two cylinders and connecting the two cylinders to each other An anti-vibration device comprising a body,
At least one hole is provided over at least a part of the cylinder circumferential direction at both ends in the cylinder axial direction of the rubber elastic body,
At least one hole at each end in the cylinder axial direction of the rubber elastic body is provided with at least one resin spring body formed integrally with the outer cylinder over at least a part in the cylinder circumferential direction. And
At least the outer cylinder body and the spring bodies constitute a resin body,
The anti-vibration device according to claim 1, wherein the resin body is divided into a plurality of parts in the cylinder axis direction and includes the plurality of divided bodies. The vibration isolator according to claim 1, wherein
The anti-vibration device according to claim 1, wherein the resin body is divided into two in the cylinder axis direction, and includes the first and second divided bodies. The vibration isolator according to claim 2,
A concave portion is provided over the entire circumference in the cylinder circumferential direction on the inner end surface in the cylinder axial direction of the outer cylinder of one of the first and second divided bodies.
A vibration isolator, wherein a convex portion is provided over the entire circumference in the cylinder circumferential direction at a portion corresponding to the concave portion on the inner axial end surface of the outer cylinder of the other divided body. The vibration isolator according to claim 2,
A vibration isolator having a predetermined distance between the inner end surfaces in the cylinder axis direction of the outer cylinders of the first and second divided bodies. In the vibration isolator as described in any one of Claims 1-4,
The hole is composed of one hole provided at each end in the cylinder axial direction of the rubber elastic body over the entire circumference in the cylinder circumferential direction,
The anti-vibration device according to claim 1, wherein the spring body is constituted by a single spring body provided in a hole at each end of the rubber elastic body in the cylinder axial direction over the entire circumference in the cylinder circumferential direction. In the vibration isolator as described in any one of Claims 1-5,
The vibration isolator, wherein the resin body is provided with at least one through hole penetrating in the thickness direction. In the vibration isolator as described in any one of Claims 1-6,
A stopper rubber elastic body formed integrally with the rubber elastic body is provided at at least one of the both ends in the cylinder axial direction of the rubber elastic body so as to protrude outward in the cylinder axial direction. Anti-vibration device characterized. It is a manufacturing method of the vibration isolator of Claim 1, Comprising:
Forming the plurality of divided bodies;
By setting the inner cylindrical body and each of the divided bodies in a cavity of a rubber injection mold, injecting and filling rubber into the cavity in that state, and heating the rubber injection mold, And a step of injection-molding the rubber elastic body. In the manufacturing method of the vibration isolator of Claim 8,
The resin body is divided into two in the cylinder axis direction, and is composed of first and second divided bodies,
The rubber injection mold includes an upper cylinder, a lower mold, and an outer cylinder of the first and second divided bodies whose inner peripheral portion is between the molds when the rubber elastic body is injection molded. A vibration isolator manufacturing method comprising: an intermediate mold disposed so as to be sandwiched between axially inner end faces.

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