JP4511438B2 - 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.
JP 49-46155 A Japanese Utility Model Publication No. 5-75537

  By the way, when a direct axial external force (external force perpendicular to the cylinder axis direction perpendicular to the cylinder axis direction) is input to the vibration isolator, one side of the rubber elastic body in the cylinder axis orthogonal direction is compressed in the cylinder axis orthogonal direction, and the rubber elastic body The other side in the cylinder axis orthogonal direction is pulled in the cylinder axis orthogonal direction. Here, there is a demand for a suspension bush of an automobile to increase the axial straightness rigidity (rigidity in the direction perpendicular to the cylinder axis) in order to improve steering stability.

  Therefore, in order to satisfy the above requirements, the present inventors have developed a rubber / resin composite type vibration isolator having a high axial rigidity by using a combination of a rubber elastic body and a resin spring body. It was.

  The present invention has been made in view of such a point, and an object thereof is to provide an inner cylinder, an outer cylinder provided coaxially with the inner cylinder on the outer periphery of the inner cylinder, An object of the present invention is to provide a technique for increasing the axial straightness rigidity in a vibration isolator provided with a rubber elastic body that is provided between the two cylinders and connects the two cylinders to each other.

The first invention includes an inner cylindrical body, an outer cylindrical body provided coaxially with the inner cylindrical body on the outer periphery of the inner cylindrical body, and the two cylindrical bodies connected to each other. An anti-vibration device comprising a rubber elastic body, wherein at least one hole portion is provided over at least part of the cylinder circumferential direction at both ends in the cylinder axial direction of the rubber elastic body, At least one resin spring body is provided over at least a part of the cylinder circumferential direction in at least one hole at each end in the cylinder axial direction of the rubber elastic body, and the outer cylinder is It is made of resin, and the spring body is formed integrally with the outer cylindrical body .

  As a result, at least one hole is provided in each end of the rubber elastic body in the cylinder axial direction over at least part of the cylinder circumferential direction, and at least one hole in each end of the rubber elastic body in the cylinder axial direction. Since at least one resin-made spring body is provided in the part over at least a part of the cylinder circumferential direction, it is possible to increase the axial straight rigidity compared to the case where no spring body is provided in the rubber elastic body.

Since the outer cylinder is made of resin, when the outer cylinder is injection molded, the rubber elastic body is pre-compressed in the direction perpendicular to the cylinder axis with the injection molding pressure. Therefore, the durability of the rubber elastic body, and thus the durability of the vibration isolator can be improved.

Furthermore , since the spring body is formed integrally with the outer cylinder body, the number of steps for manufacturing the vibration isolator can be reduced.

According to a second invention, in the first invention, the inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the rubber elastic body are in a non-bonded state, and the rubber elastic body and the spring body are not bonded. It is an adhesive state.

  By the way, in order to improve riding comfort, there is a demand for lowering torsional rigidity.

  Here, according to the present invention, the inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the rubber elastic body are in a non-adhesive state, and the rubber elastic body and the spring body are in a non-adhesive state. When a torsional external force is input to the apparatus, the outer cylinder body and the spring body slide in the twisting direction with respect to the rubber elastic body. Therefore, torsional rigidity can be reduced.

  When an external force is input to the vibration isolator (tilting about an axis orthogonal to the cylinder axis direction), the inner cylinder rotates relative to the outer cylinder about the center point in the cylinder axis direction. Thus, one end in the cylinder axis direction of the rubber elastic body is compressed in the direction perpendicular to the cylinder axis, while the other end in the cylinder axis direction of the rubber elastic body is pulled in the direction perpendicular to the cylinder axis. And in order to improve riding comfort, there exists a request | requirement of reducing a torsional rigidity.

  Here, according to the present invention, since the rubber elastic body and the spring body are not bonded, when the external force is input to the vibration isolator, the other end in the cylinder axial direction of the rubber elastic body is the cylinder. It leaves | separates from the spring body of an axial direction other end side. For this reason, the other end in the cylinder axis direction of the rubber elastic body is not pulled in the direction perpendicular to the cylinder axis. Therefore, the twisting rigidity can be reduced.

  Furthermore, since the inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the rubber elastic body are not bonded, and the rubber elastic body and the spring body are not bonded, the outer cylindrical body and the spring body can be easily attached. The outer cylinder body and the spring body can be recycled. Therefore, the recyclability of the vibration isolator can be improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the hole has a distance from an outer peripheral surface of the inner cylindrical body at each end in the cylindrical axial direction of the rubber elastic body from the inner side to the outer side in the cylindrical axial direction. It is provided to grow as you go.

  Thereby, the hole is provided at each end of the rubber elastic body in the cylinder axis direction so that the distance from the outer peripheral surface of the inner cylinder increases from the inside to the outside in the cylinder axis direction. The portion located in the hole portion also increases as the distance from the outer peripheral surface of the inner cylinder body increases from the inside in the cylinder axis direction to the outside. Therefore, compared with the case where the hole is provided so that the distance from the outer peripheral surface of the inner cylinder is the same from the inner side to the outer side in the cylinder axis direction, the portion of the spring body located in the hole The free length can be increased. Therefore, the durability of the spring body, and thus the durability of the vibration isolator can be improved.

According to a fourth invention, in any one of the first to third 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 constituted by a single spring body 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 hole is configured by 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, and the spring body is the cylinder axis of the rubber elastic body. Since it is comprised by the one spring body provided in the hole of each direction edge part over the perimeter of a cylinder circumferential direction, the axial straight rigidity of all the cylinder axis orthogonal directions can be improved.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the hole portion is provided in each of the end portions of the rubber elastic body in the cylinder axis direction opposite to each other in a predetermined cylinder axis orthogonal direction. The first and second holes are provided, and the spring bodies are respectively provided in the first and second holes at the ends of the rubber elastic body in the cylinder axial direction over the entire region in the cylinder circumferential direction. It is comprised by the provided 1st and 2nd spring body, It is characterized by the above-mentioned.

  Thereby, the hole is composed of a first hole and a second hole provided at each of the end portions of the rubber elastic body in the cylinder axis direction opposite to each other in a predetermined direction perpendicular to the cylinder axis. Since the first and second spring bodies are provided in the first and second holes at the respective ends of the rubber elastic body in the cylinder axis direction over the entire area in the cylinder circumferential direction, the cylinder axis orthogonal direction Among them, it is possible to increase the axial straight rigidity in the predetermined cylinder axis orthogonal direction (the opposite direction). Therefore, directionality can be imparted to the axial rigidity.

In a sixth aspect of the present invention based on any one of the first to third aspects, the hole is provided at each end in the cylinder axial direction of the rubber elastic body over the entire circumference in the cylinder circumferential direction. The spring body is provided with first and second portions respectively provided in mutually opposing portions in a predetermined cylinder axis orthogonal direction in the hole at each end in the cylinder axis direction of the rubber elastic body. It is characterized by comprising a spring body.

  Thereby, the hole is configured by 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, and the spring body is the cylinder axis of the rubber elastic body. Since the first and second spring bodies are provided respectively in mutually opposite portions in the predetermined orthogonal direction of the cylinder axis in the hole at each end of the direction, the predetermined cylinder axis orthogonal in the orthogonal direction of the cylinder axis It is possible to increase the axial rigidity in the direction (opposite direction). Therefore, directionality can be imparted to the axial rigidity.

A seventh invention is substantially the same as any one of the first to sixth inventions, in a cross-sectional view in which the hole and the inner end in the cylinder axis direction of the spring body are cut in a direction perpendicular to the cylinder circumferential direction. It is formed in a circular shape.

  As a result, the inner end in the cylinder axis direction of the hole and the spring body is formed in a substantially circular shape in a cross-sectional view orthogonal to the cylinder circumferential direction, so that the inner end in the cylinder axis direction of the spring body is pointed. Compared with the case where it forms, it can suppress that a crack enters into a rubber elastic body. Therefore, the durability of the rubber elastic body, and thus the durability of the vibration isolator can be improved.

According to an eighth invention, in any one of the first to seventh inventions, the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the rubber elastic body are in a non-bonded state. It is.

  Thereby, since the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the rubber elastic body are not bonded, the inner cylindrical body can be easily removed and the inner cylindrical body can be recycled. Become. Therefore, the recyclability of the vibration isolator can be improved.

According to a ninth aspect based on the eighth aspect, convex portions are respectively provided on both ends of the outer peripheral surface of the inner cylindrical body in the cylindrical axial direction over the entire circumference in the cylindrical circumferential direction. The body is provided between the two convex portions.

  As a result, the convex portions are provided on both ends of the outer peripheral surface of the inner cylindrical body in the cylinder axial direction, and the rubber elastic body is provided between the both convex portions. The rubber elastic body can be prevented from coming off from the inner cylindrical body by the both convex portions.

In a tenth aspect of the invention according to the eighth or ninth aspect, a concave portion is provided over the entire circumference in the cylinder circumferential direction at the central portion in the cylinder axis direction of the inner peripheral surface of the rubber elastic body. A convex portion is provided over the entire circumference in the cylindrical circumferential direction at a portion corresponding to the concave portion on the outer peripheral surface of the inner cylindrical body.

  As a result, a concave portion is provided over the entire circumference in the cylinder circumferential direction at the central portion in the cylinder axial direction of the inner peripheral surface of the rubber elastic body, and a convex portion is provided at a portion corresponding to the concave portion on the outer peripheral surface of the inner cylindrical body. Is provided over the entire circumference in the cylinder circumferential direction, so that the concave portion and the convex portion can be fitted together. Therefore, it can suppress that a rubber elastic body slips out of an inner cylinder body by the fitting.

An eleventh invention is characterized in that, in the ninth or tenth invention, the spring body and the convex portion are provided so as to overlap each other when viewed in the cylinder axis direction.

  Thereby, since the spring body and the convex portion are provided so as to overlap each other when viewed in the cylinder axial direction, the spring elastic body and the convex portion can more reliably suppress the rubber elastic body from coming out of the inner cylindrical body. .

In a twelfth invention according to any one of the first to seventh inventions, a concave portion is provided on the outer peripheral surface of the rubber elastic body over the entire circumference in the cylinder circumferential direction. A convex portion is provided over the entire circumference in the cylinder circumferential direction at a portion of the inner peripheral surface corresponding to the concave portion.

  As a result, the concave portion is provided on the outer peripheral surface of the rubber elastic body over the entire circumference in the cylinder circumferential direction, and the convex portion is provided on the entire inner circumferential surface of the outer cylindrical body corresponding to the concave portion. Since it is provided over the circumference, the concave and convex portions can be fitted to each other. Therefore, the outer cylinder can be prevented from coming off from the rubber elastic body by the fitting.

In a thirteenth aspect of the present invention, in any one of the first to twelfth aspects of the present invention, at both ends of the outer peripheral surface of the outer cylindrical body in the cylinder axial direction, convex portions are provided over the entire circumference in the cylindrical circumferential direction. The outer cylindrical body is press-fitted and fixed in the cylindrical portion of the link so that the cylindrical portion is positioned between the two convex portions.

  As a result, convex portions are provided on both ends of the outer peripheral surface of the outer cylinder in the cylinder axis direction over the entire circumference in the cylinder circumferential direction, and the outer cylinder is placed inside the cylinder of the link. Since it press-fits so that it may be located between convex parts, it can suppress that the cylinder part of a link comes off from a vibration isolator by both convex parts.

A fourteenth aspect of the invention is a method of manufacturing the vibration isolator according to the first aspect of the invention, wherein the inner cylinder is set in a cavity of a rubber injection mold, and rubber is injected into the cavity in that state. Filling and heating the rubber injection mold to form a molded product comprising the inner cylinder and the rubber elastic body, and setting the molded product in the cavity of the resin injection mold In this state, the cavity is injected and filled with resin, and the resin injection molding die is cooled, whereby the outer cylinder body and the spring body are integrally injection molded. It is characterized by this.

A fifteenth aspect of the invention is a method of manufacturing the vibration isolator according to the first aspect of the invention, wherein the inner cylinder is formed by inserting the inner cylinder into the rubber elastic body and a step of molding the rubber elastic body. A step of producing an intermediate product comprising a body and the rubber elastic body, and the intermediate product is set in a cavity of a mold for resin injection molding, and in that state, the resin is injected and filled, and the resin injection And a step of integrally molding the outer cylinder body and the spring body by cooling the molding die.

  According to the present invention, at least one hole is provided in each end of the rubber elastic body in the cylinder axial direction over at least part of the cylinder circumferential direction, and at least each end of the rubber elastic body in the cylinder axial direction is provided. Since at least one resin spring body is provided in at least a part of the cylinder circumferential direction in one hole portion, the shaft is compared with the case where no resin spring body is provided in the rubber elastic body. Direct rigidity can be increased.

  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.

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

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

  Next, the inner cylinder 11 is set in a cavity of a rubber injection mold (not shown), and in this state, rubber is injected and filled into the cavity through a predetermined rubber injection injection hole. The injection mold is heated. After rubber vulcanization, the rubber injection mold is released. Thereby, as shown in FIG. 3A, the rubber elastic body 13 is injection-molded, and a molded product including the inner cylinder 11 and the rubber elastic body 13 is produced.

  Next, the molded product is set in a cavity of a resin injection mold (not shown), and in that state, resin is injected and filled into the cavity through a predetermined resin injection injection hole. Cool the mold. Here, from the viewpoint of improving the stability of the shape of the rubber elastic body 13, the resin injection injection holes are preferably arranged in a well-balanced manner. Therefore, the resin injection injection holes are disposed at two locations in the vicinity of mutually opposing portions in the direction perpendicular to the cylinder axis at the center in the cylinder axis direction of the outer peripheral surface of the rubber elastic body 13 (arrow A in FIG. 3B). 3), the rubber elastic body 13 is disposed at two locations near one side in the cylinder axis orthogonal direction at one end in the cylinder axis direction and the other side in the cylinder axis orthogonal direction at the other end in the cylinder axis direction (FIG. 3B). )) (See arrow B).

  After the resin is solidified, the resin injection mold is released. Thereby, as shown in FIG.3 (b), the outer cylinder 12 and each spring body 16 are injection-molded integrally, and the vibration isolator 10 is produced. Here, the rubber elastic body 13 is pre-compressed in the direction perpendicular to the cylinder axis by the injection molding pressure (injection pressure) of the resin, and the durability is improved.

-Effect-
As described above, according to the present embodiment, one curly portion 15 is provided on both ends of the rubber elastic body 13 in the cylinder axial direction over the entire circumference in the cylinder circumferential direction. Since one spring body 16 made of resin is provided over the entire circumference in the cylindrical circumferential direction on the straight portion 15 at each end, as compared with the case where the spring body 16 is not provided in the rubber elastic body 13. The axial rigidity can be increased.

  Since the outer cylinder 12 is made of resin, when the outer cylinder 12 is injection molded, the rubber elastic body 13 is pre-compressed in the direction perpendicular to the cylinder axis with the injection molding pressure. Therefore, the durability of the rubber elastic body 13 and, in turn, the durability of the vibration isolator 10 can be improved.

  Further, since the spring body 16 is formed integrally with the outer cylinder body 12, the number of manufacturing steps of the vibration isolator 10 can be reduced.

  By the way, in order to improve riding comfort, there is a demand for lowering torsional rigidity.

  Here, according to the present embodiment, the inner peripheral surface of the outer cylindrical body 12 and the outer peripheral surface of the rubber elastic body 13 are brought into a non-adhesive state, and the rubber elastic body 13 and the spring body 16 are brought into a non-adhesive state. Therefore, when a torsional external force is input to the vibration isolator 10, the outer cylinder body 12 and the spring body 16 slide in the twisting direction with respect to the rubber elastic body 13. Therefore, torsional rigidity can be reduced.

  Further, when the external force is input to the vibration isolator 10, the inner cylinder 11 rotates relative to the outer cylinder 12 about the center point in the cylinder axis direction, and the cylinder shaft of the rubber elastic body 13 is rotated. One end in the direction is compressed in the direction perpendicular to the cylinder axis, while the other end in the cylinder axis direction of the rubber elastic body 13 is pulled in the direction perpendicular to the cylinder axis. And in order to improve riding comfort, there exists a request | requirement of reducing a torsional rigidity.

  Here, according to the present embodiment, since the rubber elastic body 13 and the spring body 16 are in the non-adhered state, as shown in FIG. 4, when an external force is input to the vibration isolator 10, the rubber The other end in the cylinder axis direction of the elastic body 13 is separated from the spring body 16 on the other end side in the cylinder axis direction. Therefore, the other end in the cylinder axis direction of the rubber elastic body 13 is not pulled in the direction perpendicular to the cylinder axis. Therefore, the twisting rigidity can be reduced.

  Furthermore, since the inner peripheral surface of the outer cylindrical body 12 and the outer peripheral surface of the rubber elastic body 13 are not bonded, and the rubber elastic body 13 and the spring body 16 are not bonded, the outer cylindrical body 12 and The spring body 16 can be easily removed, and the outer cylinder body 12 and the spring body 16 can be recycled. Therefore, the recyclability of the vibration isolator 10 can be improved.

  Further, since the straight portion 15 is provided at each end in the cylinder axis direction of the rubber elastic body 13 such 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, the spring body The portion of the 16 located at the straight portion 15 (that is, the embedded portion 18) also increases as 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. Therefore, compared with the case where the straight portion 15 is provided so that the distance from the outer peripheral surface of the inner cylindrical body 11 is the same from the inner side to the outer side in the cylindrical axis direction, the freeness of the embedded portion 18 of the spring body 16 is reduced. The length can be increased. Therefore, the durability of the spring body 16 and, in turn, the durability of the vibration isolator 10 can be improved.

  Further, the curb portion is composed of one curb portion 15 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 is formed of the rubber elastic body 13. Since it is constituted by one spring body 16 provided over the entire circumference in the cylinder circumferential direction at the straight portion 15 at each end in the cylinder axis direction, it is possible to increase the axial straight rigidity in all the cylinder axis orthogonal directions. .

(Embodiment 2)
The present embodiment is different from the first embodiment in the configuration of the straight portion 15 and the spring body 16. Hereinafter, the difference will be described.

  5 is a plan view of the vibration isolator 10 according to the second embodiment, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII in FIG. First and second straightened portions 15a and 15b are disposed at portions of the rubber elastic body 13 facing each other in the direction perpendicular to the cylinder axis on each end surface in the cylinder axis direction. Each of the first and second straight portions 15a and 15b is disposed at a portion facing each other in the cylinder axis direction at each end of the rubber elastic body 13 in the cylinder axis direction. That is, each of the first and second straight portions 15a and 15b is formed in a shape obtained by dividing the ring into four equal parts when viewed in the cylinder axis direction.

  First and second spring bodies 16a and 16b are disposed at both ends of the outer cylinder body 12 in the cylinder axis direction. The first spring body 16a has a first lid portion 17a and a first embedded portion 18a, and the second spring body 16b has a second lid portion 17b and a second embedded portion 18b.

  The first and second lid portions 17a and 17b are respectively disposed on the outer peripheral portions of the first and second straight portions 15a and 15b on the end surfaces in the cylinder axis direction of the rubber elastic body 13, and are viewed in the cylinder axis direction. The ring is divided into four equal parts.

  The first and second embedded portions 18a and 18b are respectively disposed on the first and second straight portions 15a and 15b over the entire region in the cylinder circumferential direction. That is, each of the first and second embedded portions 18a and 18b is disposed so as to be filled in all of the first and second straight portions 15a and 15b. Each of the first and second embedded portions 18a and 18b is formed to match the shape of each of the first and second straight portions 15a and 15b. That is, each of the first and second embedded portions 18a and 18b is formed in a shape that divides the hollow truncated cone into four equal parts that expands outward in the cylinder axis orthogonal direction from the inner side to the outer side in the cylinder axis direction.

-Effect-
As described above, according to the present embodiment, the straightening portion 15 is provided with the first and second straightening portions provided at the mutually opposing portions in the predetermined cylinder axis orthogonal direction at the respective ends of the rubber elastic body 13 in the cylinder axis direction. 15a and 15b, and the spring body 16 is provided on the first and second straight portions 15a and 15b at the respective ends in the cylinder axis direction of the rubber elastic body 13 over the entire area in the cylinder circumferential direction. Since it is composed of the first and second spring bodies 16a and 16b, it is possible to increase the axial rigidity in the predetermined cylinder axis orthogonal direction (the opposing direction) of the cylinder axis orthogonal directions. Therefore, directionality can be imparted to the axial rigidity.

(Embodiment 3)
In the present embodiment, the configuration of the spring body 16 is different from that of the first embodiment. Hereinafter, the difference will be described.

  8 is a plan view of the vibration isolator 10 according to the third embodiment, FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a cross-sectional view taken along line XX in FIG. First and second spring bodies 16a and 16b are disposed at both ends of the outer cylinder body 12 in the cylinder axis direction. The first spring body 16a has a first lid portion 17a and a first embedded portion 18a, and the second spring body 16b has a second lid portion 17b and a second embedded portion 18b.

  Each of the first and second lid portions 17a and 17b is disposed at a portion facing the cylinder shaft orthogonal direction in the outer peripheral portion of the straight portion 15 of each end surface of the rubber elastic body 13 in the cylinder axis direction. In the direction view, the ring is formed into four equal parts.

  Each of the first and second embedded portions 18a and 18b is disposed in a portion of each straight portion 15 facing each other in the cylinder axis orthogonal direction. Each of the first and second embedded portions 18a and 18b is disposed at a portion facing each other in the tube axis direction at each end portion of the rubber elastic body 13 in the tube axis direction. Each of the first and second embedded portions 18a and 18b is formed in a shape that divides the hollow truncated cone into four equal parts that expands outward in the cylinder axis orthogonal direction from the inner side to the outer side in the cylinder axis direction.

-Effect-
As described above, according to the present embodiment, the curb portion is configured by one curb portion 15 provided at each end in the tube axial direction of the rubber elastic body 13 over the entire circumference in the tube circumferential direction. The body 16 is composed of first and second spring bodies 16a and 16b respectively provided in portions facing each other in a predetermined direction perpendicular to the cylinder axis in the straight portion 15 at each end of the rubber elastic body 13 in the cylinder axis direction. Therefore, the axial straight rigidity in the predetermined cylinder axis orthogonal direction (the opposite direction) of the cylinder axis orthogonal directions can be increased. Therefore, directionality can be imparted to the axial rigidity.

(Embodiment 4)
As shown in FIG. 11, in the present embodiment, the straight portion 15 (not shown in FIG. 11) and the inner end portion in the cylinder axial direction of the embedded portion 18 of the spring body 16 are cut in a direction perpendicular to the circumferential direction of the cylinder. It is formed in a substantially circular shape in cross-sectional view. In other respects, the configuration is almost the same as that of the first embodiment.

-Effect-
As described above, according to the present embodiment, the inner end portion in the cylinder axis direction of the straight portion 15 and the embedded portion 18 of the spring body 16 is formed in a substantially circular shape in a cross-sectional view orthogonal to the cylinder circumferential direction. Compared to the case where the inner end in the cylinder axis direction of the embedded portion 18 of the body 16 is formed in a pointed shape, the rubber elastic body 13 can be prevented from being cracked. Therefore, the durability of the rubber elastic body 13 and, in turn, the durability of the vibration isolator 10 can be improved.

  In addition, in this embodiment, although the structure of the straight part 15 and the spring body 16 as mentioned above is applied to the vibration isolator 10 which concerns on Embodiment 1, it is not restricted to this, For example, it concerns on Embodiment 2 or 3. You may apply to the vibration isolator 10.

(Embodiment 5)
In the present embodiment, the configurations of the inner cylindrical body 11 and the rubber elastic body 13 are different from those in the first embodiment. Hereinafter, the difference will be described.

  As shown in FIG. 12, the outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of the rubber elastic body 13 are in a non-adhered state. Outer flange portions 19 as convex portions projecting outward in the direction perpendicular to the cylinder axis are continuously disposed on both ends of the outer peripheral surface of the inner cylindrical body 11 over the entire circumference in the cylinder circumferential direction. Yes. The rubber elastic body 13 is disposed between both outer flange portions 19 and 19 in the cylinder axis direction. An inner recess 20 that is recessed outward in the direction perpendicular to the cylinder axis is provided continuously at the center in the cylinder axis direction on the inner peripheral surface of the rubber elastic body 13 over the entire circumference in the cylinder circumferential direction. An inner flange portion 21 as a convex portion protruding outward in the cylinder axis orthogonal direction extends over the entire circumference in the cylinder circumferential direction at a portion corresponding to the inner recess 20 in the central portion in the cylinder axis direction of the outer peripheral surface of the inner cylinder 11. It is provided continuously. The inner flange portion 21 is fitted in the inner concave portion 20. The inner flange portion 21 is disposed between the embedded portions 18 of the two spring bodies 16 and 16 in the cylinder axis direction. The inner flange portion 21 and the embedded portion 18 of each spring body 16 are disposed so as to overlap each other when viewed in the cylinder axis direction.

-Effect-
As described above, according to the present embodiment, since the outer peripheral surface of the inner cylindrical body 11 and the inner peripheral surface of the rubber elastic body 13 are in the non-bonded state, the inner cylindrical body 11 can be easily removed. The inner cylinder 11 can be recycled. Therefore, the recyclability of the vibration isolator 10 can be improved.

  Further, outer flange portions 19 are provided on both ends of the outer peripheral surface of the inner cylinder body 11 in the cylinder axial direction over the entire circumference in the cylinder circumferential direction, and the rubber elastic body 13 is provided on both outer flange portions 19 and 19. The rubber elastic body 13 can be prevented from coming off from the inner cylindrical body 11 by the outer flange portions 19 and 19.

  Further, an inner concave portion 20 is provided over the entire circumference in the cylinder circumferential direction at the central portion in the cylinder axial direction of the inner circumferential surface of the rubber elastic body 13, and corresponds to the inner concave portion 20 on the outer circumferential surface of the inner cylindrical body 11. Since the inner flange portion 21 is provided in the part over the entire circumference in the cylinder circumferential direction, the inner recess portion 20 and the inner flange portion 21 can be fitted to each other. Therefore, the rubber elastic body 13 can be prevented from coming off from the inner cylinder body 11 by the fitting.

  Further, since the embedded portion 18 and the inner flange portion 21 of each spring body 16 are provided so as to overlap each other when viewed in the cylinder axis direction, the embedded portion 18 and the inner flange portion 21 of each spring body 16 provide rubber. It can suppress more reliably that the elastic body 13 slips out from the inner cylinder 11.

  In the present embodiment, the configuration of the inner cylindrical body 11 and the rubber elastic body 13 as described above is applied to the vibration isolator 10 according to the first embodiment. However, the present invention is not limited thereto, and for example, the second or third embodiment. You may apply to the vibration isolator 10 which concerns.

(Embodiment 6)
In the present embodiment, the configurations of the inner cylindrical body 11 and the rubber elastic body 13 are different from those in the first embodiment. Hereinafter, the difference will be described.

  As shown in FIG. 13, the outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of the rubber elastic body 13 are in a non-bonded state. The inner cylinder 11 is equally divided into two in the cylinder axis direction, and includes first and second inner cylinders 11a and 11b. Outer flange portions 19 projecting outward in the cylinder axis orthogonal direction are respectively provided continuously at the both ends of the outer peripheral surface of the inner cylinder body 11 in the cylinder axis direction over the entire circumference in the cylinder circumferential direction. The rubber elastic body 13 is disposed between the outer flange portions 19 and 19 in the cylinder axis direction. Each outer flange portion 19 and the embedded portion 18 of each spring body 16 are arranged so as to overlap each other when viewed in the cylinder axis direction. Each curling portion 15 is provided continuously at each end in the cylinder axis direction of the rubber elastic body 13 over the entire circumference in the cylinder circumferential direction, and opens toward the outside in the cylinder axis orthogonal direction.

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

  First, rubber is injected and filled into a cavity of a rubber injection mold (not shown), and the rubber injection mold is heated. After rubber vulcanization, the rubber injection mold is released. Thereby, the rubber elastic body 13 is injection-molded.

  Next, the first and second inner cylinders 11a and 11b are inserted and fitted into the rubber elastic body 13 from both ends in the cylinder axis direction. Thereby, the intermediate product which consists of the inner cylinder 11 and the rubber elastic body 13 is produced.

  Next, the intermediate product is set in a cavity of a resin injection mold (not shown), and in this state, 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, the outer cylinder 12 and each spring body 16 are injection-molded integrally, and the vibration isolator 10 is produced.

-Effect-
As described above, according to the present embodiment, since the outer peripheral surface of the inner cylindrical body 11 and the inner peripheral surface of the rubber elastic body 13 are in the non-bonded state, the inner cylindrical body 11 can be easily removed. The inner cylinder 11 can be recycled. Therefore, the recyclability of the vibration isolator 10 can be improved.

  Further, outer flange portions 19 are provided on both ends of the outer peripheral surface of the inner cylinder body 11 in the cylinder axial direction over the entire circumference in the cylinder circumferential direction, and the rubber elastic body 13 is provided on both outer flange portions 19 and 19. The rubber elastic body 13 can be prevented from coming off from the inner cylindrical body 11 by the outer flange portions 19 and 19.

  Further, since the embedded portion 18 and each outer flange portion 19 of each spring body 16 are provided so as to overlap each other when viewed in the cylinder axis direction, the embedded portion 18 and each outer flange portion 19 of each spring body 16 Further, it is possible to more reliably suppress the rubber elastic body 13 from coming out of the inner cylindrical body 11.

  In the present embodiment, the configuration of the inner cylindrical body 11 and the rubber elastic body 13 as described above is applied to the vibration isolator 10 according to the first embodiment. However, the present invention is not limited thereto, and for example, the second or third embodiment. You may apply to the vibration isolator 10 which concerns.

(Embodiment 7)
In the present embodiment, the configurations of the inner cylindrical body 11 and the rubber elastic body 13 are different from those of the sixth embodiment. Hereinafter, the difference will be described.

  As shown in FIG. 14, an inner recess 20 that is recessed outward in the cylinder axis orthogonal direction is continuously provided over the entire circumference in the cylinder circumferential direction at the center in the cylinder axis direction of the inner peripheral surface of the rubber elastic body 13. ing. An inner flange portion 21 that protrudes outward in the cylinder axis orthogonal direction is provided continuously over the entire circumference in the cylinder circumferential direction at a portion corresponding to the inner recess 20 in the central portion in the cylinder axis direction of the outer peripheral surface of the inner cylinder body 11. It has been. The inner flange portion 21 is fitted in the inner concave portion 20. The inner flange portion 21, each outer flange portion 19, and the embedded portion 18 of each spring body 16 are disposed so as to overlap each other when viewed in the cylinder axis direction.

-Effect-
As described above, according to the present embodiment, the inner concave portion 20 is provided over the entire circumference in the cylinder circumferential direction at the central portion in the cylinder axis direction of the inner circumferential surface of the rubber elastic body 13, and the outer circumferential surface of the inner cylinder 11. Since the inner flange portion 21 is provided in the portion corresponding to the inner recess portion 20 over the entire circumference in the cylinder circumferential direction, the inner recess portion 20 and the inner flange portion 21 can be fitted together. Therefore, the rubber elastic body 13 can be prevented from coming off from the inner cylinder body 11 by the fitting.

  Further, since the embedded portion 18, each outer flange portion 19, and the inner flange portion 21 of each spring body 16 are provided so as to overlap each other when viewed in the cylinder axis direction, the embedded portion 18 of each spring body 16, The outer flange portion 19 and the inner flange portion 21 can more reliably suppress the rubber elastic body 13 from coming off the inner cylindrical body 11.

(Embodiment 8)
As shown in FIG. 15, in the present embodiment, an outer concave portion 22 that is recessed in the cylinder axis orthogonal direction is continuously provided over the entire circumference in the cylinder circumferential direction at the central portion in the cylinder axis direction of the outer peripheral surface of the rubber elastic body 13. In the portion corresponding to the outer concave portion 22 in the central portion in the tube axial direction of the inner peripheral surface of the outer cylindrical body 12, a convex portion 23 protruding inward in the direction perpendicular to the cylindrical axis is provided on the entire circumference in the cylindrical circumferential direction The convex portion 23 is fitted into the outer concave portion 22. In other respects, the configuration is almost the same as that of the first embodiment.

-Effect-
As described above, according to the present embodiment, the outer concave portion 22 is provided on the outer peripheral surface of the rubber elastic body 13 over the entire circumference in the cylinder circumferential direction, and the outer concave portion 22 on the inner peripheral surface of the outer cylindrical body 12 is provided. Since the convex part 23 is provided in the corresponding part over the perimeter of a cylinder circumferential direction, these outer side recessed parts 22 and the convex part 23 can be mutually fitted. Therefore, it can suppress that the outer cylinder body 12 comes off from the rubber elastic body 13 by the fitting.

  In addition, in this embodiment, although the structure of the above outer cylinder 12 and the rubber elastic body 13 is applied to the vibration isolator 10 which concerns on Embodiment 1, it is not restricted to this, For example, Embodiment 2 or 3 You may apply to the vibration isolator 10 which concerns.

(Embodiment 9)
As shown in FIG. 16, in the present embodiment, the outer convex portions 24 that protrude outward in the cylinder axis orthogonal direction are provided on both ends of the outer peripheral surface of the outer cylinder 12 in the cylinder axis direction over the entire circumference in the cylinder circumferential direction. The cylinder portions 14 of the suspension link are arranged in succession, and are arranged between both outer convex portions 24, 24 in the cylinder axis direction. In other respects, the configuration is almost the same as that of the first embodiment.

-Effect-
As described above, according to the present embodiment, the outer convex portions 24 are respectively provided over the entire circumference in the cylinder circumferential direction at both ends of the outer circumferential surface of the outer cylinder 12 in the cylinder axis direction. The cylinder portion 14 of the suspension link is press-fitted and fixed in the cylinder portion 14 of the suspension link so that the cylinder portion 14 is positioned between the both outer projections 24, 24. 14 can be prevented from coming off from the vibration isolator 10.

  In the present embodiment, the configuration of the outer cylindrical body 12 as described above is applied to the vibration isolator 10 according to the first embodiment. However, the configuration is not limited thereto, and for example, the vibration isolator according to the second or third embodiment. 10 may be applied.

(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-described embodiments, the straight portion 15 and the spring body 16 are provided as described above, but at least one straight portion 15 is provided in the cylindrical circumferential direction at each cylindrical axial end of the rubber elastic body 13. At least one spring body 16 may be provided over at least a part in the cylinder circumferential direction on at least one straight part 15 at each end of the rubber elastic body 13 in the cylinder axis direction. .

  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. However, from the viewpoint of improving the durability of the spring body 16 and thus the durability of the vibration isolator 10, the straight portion 15 increases as 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. It is preferable to form such that

  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 the embedding part 18 of each spring body 16, the rubber elastic body 13 is not provided. May be. 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, the embedded portion 18 of each spring body 16 may be brought into contact with the outer peripheral surface of the inner cylindrical body 11. Here, when the rubber elastic body 13 is disposed, the static spring characteristic in the direction perpendicular to the cylinder axis is a two-stage characteristic, and when the rubber elastic body 13 is not disposed, the static spring characteristic is linear.

  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. However, in the bonded state, the torsional rigidity and the torsional rigidity cannot be lowered.

  Moreover, in the said Embodiment 5 and 6, 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 non-adhesion state, in other embodiment, it is made into a non-adhesion state. Also good.

  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 provides an inner cylinder, an outer cylinder provided coaxially with the inner cylinder on the outer periphery of the inner cylinder, and the two cylinders provided between the two cylinders. It is useful for a vibration isolator provided with a rubber elastic body that connects the bodies 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 rubber elastic body, (b) is the injection molding of an outer cylinder body and a spring body. It is a figure which shows this process. It is a figure which shows a mode when external force is input to the vibration isolator. It is a top view of the vibration isolator which concerns on Embodiment 2. FIG. It is sectional drawing of the VI-VI line of FIG. It is sectional drawing of the VII-VII line of FIG. It is a top view of the vibration isolator which concerns on Embodiment 3. It is sectional drawing of the IX-IX line of FIG. It is sectional drawing of the XX line of FIG. It is sectional drawing cut | disconnected in the direction orthogonal to the cylinder circumferential direction of the outer cylinder body and spring body which concern on Embodiment 4. FIG. It is a figure equivalent to FIG. 2 of the vibration isolator which concerns on Embodiment 5. FIG. It is a figure equivalent to FIG. 2 of the vibration isolator which concerns on Embodiment 6. FIG. It is a figure equivalent to FIG. 2 of the vibration isolator which concerns on Embodiment 7. FIG. It is a figure equivalent to FIG. 2 of the vibration isolator which concerns on Embodiment 8. FIG. It is a figure equivalent to FIG. 2 of the vibration isolator which concerns on Embodiment 9. FIG.

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 part 18 Buried part 19 Outer flange part (convex part)
20 Inner recess 21 Inner flange (convex)
22 Outer concave portion 23 Convex portion 24 Outer convex portion

Claims (15)

An inner cylinder, an outer cylinder provided coaxially with the inner cylinder on the outer periphery of the inner cylinder, and a rubber elastic body provided between the two cylinders and connecting the two cylinders to each other. An anti-vibration device provided,
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,
In at least one hole at each end of the rubber elastic body in the cylinder axis direction, at least one resin spring body is provided over at least a part of the cylinder circumferential direction ,
The outer cylinder is made of resin,
The vibration isolator according to claim 1, wherein the spring body is formed integrally with the outer cylindrical body . The vibration isolator according to claim 1 , wherein
The inner peripheral surface of the outer cylinder and the outer peripheral surface of the rubber elastic body are in a non-adhered state,
The vibration isolator according to claim 1, wherein the rubber elastic body and the spring body are in an unbonded state. The vibration isolator according to claim 1 or 2 ,
The hole is provided at each end in the cylinder axial direction of the rubber elastic body so that the distance from the outer peripheral surface of the inner cylinder increases from the inner side to the outer side in the cylindrical axis direction. Anti-vibration device. In the vibration isolator as described in any one of Claims 1-3 ,
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 1-3 ,
The hole is composed of a first hole and a second hole provided in each of the end portions of the rubber elastic body facing each other in a predetermined direction perpendicular to the cylinder axis at each end in the cylinder axis direction,
The said spring body is comprised by the 1st and 2nd spring body each provided in the 1st and 2nd hole of each cylinder axial direction edge part of the said rubber elastic body over the whole region of a cylinder circumferential direction, respectively. Anti-vibration device characterized by In the vibration isolator as described in any one of Claims 1-3 ,
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 said spring body is comprised by the 1st and 2nd spring body each provided in the mutually opposing part of the predetermined cylinder-axis orthogonal direction in the hole of each cylinder-axis direction edge part of the said rubber elastic body. Anti-vibration device characterized. In the vibration isolator as described in any one of Claims 1-6 ,
The vibration isolator, wherein the hole and the inner end in the cylinder axial direction of the spring body are formed in a substantially circular shape in a cross-sectional view cut in a direction orthogonal to the cylinder circumferential direction. Vibration damping device according to any one of claims 1-7,
The anti-vibration device according to claim 1, wherein an outer peripheral surface of the inner cylinder and an inner peripheral surface of the rubber elastic body are in a non-bonded state. The vibration isolator according to claim 8 ,
Convex portions are respectively provided over the entire circumference in the cylinder circumferential direction at both ends in the cylinder axis direction of the outer peripheral surface of the inner cylinder.
The vibration isolator is characterized in that the rubber elastic body is provided between the both convex portions. The vibration isolator according to claim 8 or 9 ,
A concave portion is provided over the entire circumference in the cylinder circumferential direction at the center in the cylinder axial direction of the inner peripheral surface of the rubber elastic body,
A vibration isolator, wherein a convex portion is provided over the entire circumference in the cylindrical circumferential direction at a portion corresponding to the concave portion on the outer peripheral surface of the inner cylindrical body. The vibration isolator according to claim 9 or 10 ,
The anti-vibration device according to claim 1, wherein the spring body and the convex portion are provided so as to overlap each other when viewed in the cylinder axis direction. Vibration damping device according to any one of claims 1-7,
On the outer peripheral surface of the rubber elastic body, a recess is provided over the entire circumference in the cylinder circumferential direction,
A vibration isolator, wherein a convex portion is provided over the entire circumference in the cylindrical circumferential direction at a portion corresponding to the concave portion on the inner circumferential surface of the outer cylindrical body. Vibration damping device according to any one of claims 1 to 12,
On both ends of the outer peripheral surface of the outer cylindrical body in the cylinder axial direction, convex portions are respectively provided over the entire circumference in the cylindrical circumferential direction,
The anti-vibration device according to claim 1, wherein the outer cylindrical body is press-fitted and fixed in the cylindrical portion of the link so that the cylindrical portion is positioned between the two convex portions. It is a manufacturing method of the vibration isolator of Claim 1 , Comprising:
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, A step of making a molded article comprising the rubber elastic body,
By setting the molded product in a cavity of a resin injection mold, injecting and filling the cavity with resin in that state, and cooling the resin injection mold, the outer cylinder and the above And a step of injection-molding the spring body integrally with the spring body. It is a manufacturing method of the vibration isolator of Claim 1 , Comprising:
Forming the rubber elastic body;
Inserting the inner cylinder into the rubber elastic body to produce an intermediate product composed of the inner cylinder and the rubber elastic body;
The intermediate product is set in the cavity of the resin injection mold, and in that state, the resin is injected and filled, and the resin injection mold is cooled, whereby the outer cylinder body and the resin And a step of injection-molding the spring body integrally with the spring body.

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