JP5687102B2 - Vibration isolator - Google Patents

Description

  The present invention relates to an anti-vibration device in which a vibration generating source and a vibration receiving side are anti-vibrated and connected to each other, and more particularly, to an anti-vibration device that can omit drawing of an outer cylinder member and can ensure durability.

  Conventionally, vibration isolators such as torque rods and suspension arms that connect the vibration generating side and the vibration receiving side to each other have been used. This vibration isolator includes two bushes attached to the vibration generating side and the vibration receiving side and a connecting member that connects the two bushes to each other. Each of the two bushes includes an inner cylinder member and an outer cylinder member that are formed in a cylindrical shape, and a vibration-isolating base that is formed of a rubber-like elastic body provided therebetween. For example, as disclosed in Patent Document 1, the bush is formed by applying an adhesive to the outer surface of the inner cylinder member and the inner surface of the outer cylinder member, and then molding the inner cylinder member, the outer cylinder member, and the unvulcanized rubber. It is manufactured by heating and pressurizing in a mold to crosslink and cure the unvulcanized rubber, and to bond the cross-linked and cured rubber-like elastic body to the inner cylinder member and the outer cylinder member.

JP 2001-260233 A

  However, since unvulcanized rubber undergoes curing shrinkage during crosslinking, tensile strain is generated at the inner surface of the outer cylinder member and the adhesion interface between the outer surface of the inner cylinder member and the rubber-like elastic body. This tensile strain adversely affects the fracture life of the vibration-proof substrate (durability of the vibration-proof device).

  Therefore, for an anti-vibration device capable of compressing and reducing the diameter of the outer cylinder member (for example, pressing the outer cylinder fitting into a bracket or the like), after crosslinking and curing the rubber-like elastic body, Drawing was performed to compress the outer cylinder member (outer cylinder fitting). This drawing process removes the tensile strain at the adhesive interface and ensures the durability of the vibration isolator. In this case, in order to ensure the durability of the vibration isolator, there is a problem that the drawing of the outer cylinder member cannot be omitted.

  Further, among vibration isolators, it is difficult to compress the outer cylinder member to reduce the diameter (for example, those in which a rubber-like elastic body is directly vulcanized and bonded to a bracket or the like, and the outer cylinder member is made of a synthetic resin) However, since it is difficult to draw the outer cylinder member, it is difficult to remove the tensile strain at the adhesive interface, and it is difficult to ensure the durability of the vibration isolator.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vibration isolator capable of omitting drawing of the outer cylinder member and ensuring durability.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, the vibration isolator according to claim 1 comprises two bushes attached to the vibration generating side and the vibration receiving side, and a connecting member for connecting the two bushes to each other. In the vibration isolator, each of the two bushes is bonded to a vibration isolating base made of a rubber-like elastic body on the inner surface of the outer cylindrical member. The vibration isolating base has a through hole formed so as to penetrate in the axial direction, and the cylindrical portion of the inner cylinder member formed in a cylindrical shape is press-fitted into the through hole of the vibration isolating base. When the cylinder portion is press-fitted into the through hole, the diameter of the through hole is increased, and the vibration-proof base is compressed between the cylinder portion and the outer cylinder member. As a result, a compressive force can be applied to the adhesion interface between the inner surface of the outer cylinder member and the vibration-proof base. Therefore, it is possible to remove the tensile strain at the adhesive interface between the inner surface of the outer cylinder member and the vibration isolating base, and to secure the durability of the vibration isolator.

Furthermore, since the tensile strain at the adhesive interface between the inner surface of the outer cylinder member and the vibration-proof base can be removed without drawing the outer cylinder member, there is an effect that the drawing process of the outer cylinder member can be omitted.
Moreover, the cylinder part is provided with the 1st cylinder part and the 2nd cylinder part which consists of a 1st cylinder part and another member. Since the first cylinder part can be press-fitted from one side of the through-hole and the second cylinder part can be press-fitted from the other side of the through-hole, there is an effect of improving the press-fitting workability of the inner cylinder member.

Moreover, the 1st cylinder part and the 2nd cylinder part are equipped with the chamfering part in the perimeter of the edge of the outer peripheral surface of the front-end | tip press-fitted in a through-hole. Thereby, the 1st cylinder part and the 2nd cylinder part can be press-fitted in a through-hole, making it guide to a chamfering part. Therefore, there is an effect that the press-fit workability of the inner cylinder member can be improved.

In addition, a bolt is inserted into an insertion hole penetrating the first cylinder part and the second cylinder part in the axial direction, and each of the two bushings is fastened and fixed to the vibration generating side and the vibration receiving side, and the tip of the first cylinder part A recess is formed by the chamfered portion when the end surface of the first tube and the end surface of the second cylindrical portion are in contact with each other in the axial direction. Since the recess receives the vibration isolating base that is deformed by press-fitting the first cylindrical portion and the second cylindrical portion, the vibration isolating base can be prevented from being caught between the mating surfaces of the first cylindrical portion and the second cylindrical portion. . Therefore, the mating surfaces of the first cylinder part and the second cylinder part can be reliably abutted in the axial direction within the through hole . As a result, there is no possibility that the vibration isolating base is interposed between the mating surfaces of the first tube portion and the second tube portion, and it is possible to prevent the bolts that are fastened and fixed from being easily loosened.

According to the vibration isolator of claim 2 , the first cylindrical portion and the second cylindrical portion are inclined portions whose outer diameter gradually decreases from the other end side toward the respective one ends that are press-fitted into the through holes, And a cylindrical small-diameter portion provided on one end side of the inclined portion. Thereby, since it can press-fit the 1st cylinder part and the 2nd cylinder part to a through-hole, guiding it to an inclination part, there exists an effect which can improve the press-fit workability | operativity of an inner cylinder member.
In addition, since the first cylindrical portion and the second cylindrical portion have a recess for rubber escape formed on one end side by the inclined portion and the small-diameter portion, the anti-vibration is deformed by the press-fitting of the first cylindrical portion and the second cylindrical portion. A substrate can be received. Thereby, it can prevent that a vibration proof base | substrate is bitten between the mating surfaces of a 1st cylinder part and a 2nd cylinder part. Therefore, in addition to the effect of the first aspect , the press-fit workability of the inner cylinder member can be improved, and the mating surface of the first cylinder part and the second cylinder part can be reliably abutted in the axial direction in the through hole. There is an effect that can be done.
According to the vibration isolator of claim 3 , the first cylinder part and the second cylinder part are formed to project from the outer periphery in the shape of a hook in the direction perpendicular to the axis, and the projecting part is press-fitted into the through hole. And a tapered portion having an outer diameter that gradually decreases toward each end that is press-fitted into the through hole from the overhang portion. As a result, the first tube portion and the second tube portion can be press-fitted into the through-hole while being guided by the tapered portion, and the first tube portion and the second tube portion that are press-fitted so as to face each other can be prevented from falling off. . Therefore, in addition to the effect of the first or second aspect , the press-fit workability of the inner cylinder member can be improved and the inner cylinder member can be prevented from falling off.

(A) is a top view of the vibration isolator in 1st Embodiment, (b) is sectional drawing of the vibration isolator in the Ib-Ib line. (A) is an axial sectional view of the outer cylindrical member and the vibration isolating base before the inner cylindrical member is press-fitted, and (b) is an axial sectional view of the inner cylindrical member. (A) is an axial sectional view of the vibration isolator in 2nd Embodiment, (b) is an axial sectional view of an inner cylinder member. (A) is a top view of the vibration isolator in 3rd Embodiment, (b) is sectional drawing of the vibration isolator in the IVb-IVb line. It is a schematic diagram of the assembly apparatus of a vibration isolator. (A) is a schematic diagram which shows the state which fixed the outer cylinder member to the assembly apparatus, (b) is a schematic diagram which shows the state which raised the raising / lowering body and deform | transformed the vibration-proof base, (c) is It is a schematic diagram which shows the state which press-fitted the cylinder part to the vibration-proof base, (d) is a schematic diagram which shows the state which lowered the raising / lowering body. (A) is a top view of the vibration isolator in 4th Embodiment, (b) is sectional drawing of the vibration isolator in the VIIb-VIIb line. (A) is an axial sectional view of the vibration isolator in the fifth embodiment, (b) is an axial sectional view of the vibration isolator in the sixth embodiment, and (c) is the seventh embodiment. It is an axial sectional view of the vibration isolator in the form. (A) is an axial sectional view of the vibration isolator in the eighth embodiment, (b) is an axial sectional view of the vibration isolator in the ninth embodiment, and (c) is the tenth embodiment. It is an axial sectional view of the vibration isolator in the form. (A) is a schematic diagram showing a state in which an outer cylinder member and a cylinder portion to which an anti-vibration base is bonded are set in an assembling apparatus, and (b) fixes the outer cylinder member to which an anti-vibration base is bonded to the assembling apparatus. It is a schematic diagram which shows the state which carried out, and (c) is a schematic diagram which shows the state which raised the raising / lowering body, (d) is a schematic diagram which shows the state which press-fit the cylinder part to the vibration-proof base. (A) is an axial sectional view of the inner cylinder member of the vibration isolator in the eleventh embodiment, (b) is an axial sectional view of the inner cylinder member of the vibration isolator in the twelfth embodiment, (C) is an axial sectional view of the inner cylinder member of the vibration isolator in the thirteenth embodiment, and (d) is an axial sectional view of the inner cylinder member of the vibration isolator in the fourteenth embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. Fig.1 (a) is a top view of the vibration isolator 1 in 1st Embodiment of this invention, FIG.1 (b) is sectional drawing of the vibration isolator 1 in the Ib-Ib line | wire of Fig.1 (a). is there. In FIGS. 1A and 1B, a part (one bush) of the vibration isolator 1 (torque rod) used for connecting the vibration generating side and the vibration receiving side is illustrated. The illustration of the other bush and the illustration of the connecting member 2 (rod) connecting the two bushes in the longitudinal direction are omitted.

  As shown in FIG. 1A, the bush of the vibration isolator 1 includes an inner cylinder member 10 attached to a vibration generation side or vibration receiving side member (not shown), and an outer peripheral side of the inner cylinder member 10. And an anti-vibration base body 30 that is interposed between the outer cylinder member 20 and the inner cylinder member 10 and is made of a rubber-like elastic material. Configured.

  The inner cylinder member 10 is formed of a metal material in a cylindrical shape, and is fastened with a bolt to a vibration generation side or vibration receiving side member (not shown) via an insertion hole 11 formed in the center of the inner cylinder member 10. Fixed. The outer cylinder member 20 is made of a metal material in a cylindrical shape, is integrally formed with the connecting member 2 (rod), and is positioned on the outer peripheral side of the inner cylinder member 10 with a predetermined interval. The vibration-proof base 30 has a through-hole 31 that is penetrated in the axial direction in the center. The inner surface of the through-hole 31 is in close contact with the outer surface of the inner cylinder member 10, and the inner cylinder member 10 and the outer cylinder member 20 They are connected over the entire circumference.

  As shown in FIG. 1B, the anti-vibration base 30 is formed with a pair of recesses 32 extending in the circumferential direction with a concave longitudinal section opening outward in the axial direction at both ends in the axial direction. By forming the recess 32, stress concentration and distortion of the vibration isolating base 30 due to tensile deformation caused by vibrations acting on the vibration isolator 1 are reduced.

  The inner cylinder member 10 is formed in a cylindrical shape and is press-fitted into the through-hole 31, and an outer edge of the inner cylinder member 10 protrudes in the direction intersecting the axial direction with respect to the outer periphery of the cylinder part 12, and is one end of the cylinder part 12 A first flange portion 13 projecting on the side, and a second flange portion 14 disposed on the other end side of the cylindrical portion 12 with an outer edge extending in a direction intersecting the axial direction with respect to the outer periphery of the cylindrical portion 12. It has.

  The cylindrical portion 12 has a first flange portion 13 projecting from the other end side, and one end side is press-fitted from one side (left side in FIG. 1B) of the through hole 31, and the outer surface is constrained by the inner surface of the through hole 31. The first cylindrical portion 12a and a member separate from the first cylindrical portion 12a, the second flange portion 14 projecting from one end side, and from the other side of the through hole 31 (right side in FIG. 1 (b)). A second cylindrical portion 12b whose other end is press-fitted and whose outer surface is constrained by the inner surface of the through-hole 31.

  Next, a method for assembling the vibration isolator will be described with reference to FIG. 2A is an axial sectional view of the outer cylinder member 20 and the vibration isolation base 30 (intermediate product S) before the inner cylinder member 10 is press-fitted, and FIG. 2B is an axis of the inner cylinder member 10. FIG. The vibration isolator 1 is assembled by pressing the inner cylinder member 10 into the intermediate product S.

  As shown in FIG. 2A, the intermediate product S is a member in which the vibration isolation base 30 is bonded to the outer cylinder member 20. In order to manufacture the intermediate product S, first, the outer cylinder member 20 is set in a molding die (not shown) provided with a core for forming the through hole 31. An adhesive is applied to the inner surface 21 of the outer cylinder member 20. Next, after injecting unvulcanized rubber into the molding die, the molding die is heated and pressurized to crosslink and cure the unvulcanized rubber and to bond the cross-cured rubber-like elastic body and the outer cylindrical member 20. Thereby, the through-hole 31 is formed in the axial direction of the vibration isolating base 30, and the intermediate product S in which the vibration isolating base 30 is bonded to the outer cylinder member 20 is manufactured. The unvulcanized rubber constituting the vibration-proof substrate 30 by crosslinking and curing causes curing shrinkage during the crosslinking and curing, so that the intermediate product S is an adhesive interface between the inner surface 21 of the outer cylindrical member 20 and the vibration-proof substrate 30. Tensile strain is generated.

  As shown in FIG. 2B, the inner cylinder member 10 is composed of two parts, and the first cylinder part 12a and the first flange part 13, and the second cylinder part 12b and the second flange part 14 have the same shape. And it is formed in the same size. Thereby, a single part can be used as two parts which comprise the inner cylinder member 10, and a number of parts can be reduced.

  The inner diameter D1 of the through hole 31 formed in the intermediate product S is set to a value smaller than the outer diameter D2 of the cylindrical portion 12 (the first cylindrical portion 12a and the second cylindrical portion 12b) of the inner cylindrical member 10. . In the present embodiment, the length L1 + L2 obtained by adding the length L1 of the first cylinder portion 12a and the length L2 of the second cylinder portion 12b is the length L3 in the axial direction of the through hole 31 of the intermediate product S. It is set to be smaller. Further, the first flange 13 and the second flange 14 are formed so that the entire circumference protrudes in a direction perpendicular to the axial direction with respect to the outer circumferences of the first cylinder part 12a and the second cylinder part 12b.

  The vibration isolator 1 is press-fitted from one side of the through-hole 31 of the intermediate product S to one end side of the first cylindrical portion 12a in which the first flange portion 13 protrudes from the other end side, and the second flange to the one end side. It is manufactured by press-fitting the other end side of the second cylindrical portion 12b on which the portion 14 is projected from the other side of the through hole 31 of the intermediate product S. Since the first cylinder part 12a and the second cylinder part 12b are press-fitted from one side and the other side of the through-hole 31, the outer surfaces of the first cylinder part 12a and the second cylinder part 12b and the vibration-proof substrate 30 are vulcanized and bonded. Even if it does not do, the outer surface of the 1st cylinder part 12a and the 2nd cylinder part 12b will be restrained by the internal peripheral surface of the through-hole 31. FIG. Thereby, it can prevent that the tensile strain accompanying the hardening shrinkage | contraction of a rubber-like elastic body arises in the interface of the 1st cylinder part 12a and the 2nd cylinder part 12b, and the vibration proof base 30.

  Furthermore, since the inner diameter D1 of the through hole 31 is set to a value smaller than the outer diameter D2 of the first cylindrical portion 12a and the second cylindrical portion 12b, the first cylindrical portion 12a and the second cylindrical portion 12b are formed in the through hole 31. As a result, the through-hole 31 is expanded in diameter, and the vibration isolation base 30 is compressed between the first and second cylindrical portions 12a, 12b and the outer cylindrical member 20. As a result, a compressive force can be applied to the adhesion interface between the inner surface 21 of the outer cylinder member 20 and the vibration isolation base 30. Therefore, the tensile strain generated at the bonding interface between the inner surface 21 of the outer cylinder member 20 and the vibration isolation base 30 can be removed, and the durability of the vibration isolation device 1 can be improved.

  Further, the vibration isolating base 30 is compressed between the first cylindrical portion 12a and the second cylindrical portion 12b and the outer cylindrical member 20, and a preload is applied to the vibration isolating base 30, thereby increasing the spring constant in the direction perpendicular to the axis. can do. As a result, it is possible to improve the vibration isolation characteristics when a large vibration is input to the vibration isolation device 1 (when a large load is input).

  In addition, since the inner cylinder member 10 is press-fitted into the through hole 31 without drawing the outer cylinder member 20, the tensile strain at the bonding interface between the inner surface 21 of the outer cylinder member 20 and the vibration isolation base 30 can be removed. The drawing of the outer cylinder member 20 can be omitted. Therefore, also in the vibration isolator 1 that directly vulcanizes and bonds the rubber-like elastic body to the outer cylinder member 20, the tensile strain at the bonding interface can be removed without drawing the outer cylinder member 20, and the vibration isolator 1 durability can be improved.

  Further, the first flange portion 13 can prevent the first cylindrical portion 12 a press-fitted from one side of the through hole 31 from dropping from the other side of the through hole 31. Further, the second flange portion 14 can prevent the second cylindrical portion 12 b press-fitted from the other side of the through hole 31 from dropping from one side of the through hole 31.

  In addition, a bolt (not shown) is inserted into an insertion hole 11 formed in the center of the inner cylinder member 10, and is fastened and fixed to a counterpart component (not shown) on the vibration generating side or the vibration receiving side. The first cylinder part 12 a and the second cylinder part 12 b are prevented from dropping from the through hole 31 by being blocked by the flange part 13 and the second flange part 14. Since it is possible to achieve complete drop-off prevention at the same time as fastening with bolts to the mating part, it is excellent in workability and reliability.

  Moreover, since the 1st cylinder part 12a and the 2nd cylinder part 12b which comprise the cylinder part 12 consist of separate members, without letting the 1st flange part 13 and the 2nd flange part 14 pass the inner side of the through-hole 31, it is 1st. The first cylinder part 12 a and the second cylinder part 12 b can be press-fitted into the through hole 31. Since the first cylinder part 12a and the second cylinder part 12b can be press-fitted without expanding the through hole 31 to the size that allows the first flange part 13 and the second flange part 14 to pass through, the press-fitting workability of the inner cylinder member 10 can be achieved. Can be improved. Furthermore, since the outer edges of the first flange portion 13 and the second flange portion 14 can be formed so as to largely protrude from the inner peripheral edge of the through hole 31, the press-fitted inner cylinder member 10 drops from the through hole 31. Can be surely prevented.

Further, the length L1 + L2 obtained by adding the length L1 of the first cylindrical portion 12a and the length L2 of the second cylindrical portion 12b is smaller than the length L3 in the axial direction of the through hole 31 of the intermediate product S. Is set. Furthermore, the 1st flange part 13 and the 2nd flange part 14 are formed so that the perimeter may protrude in the direction orthogonal to an axial direction with respect to the outer periphery of the 1st cylinder part 12a and the 2nd cylinder part 12b. As a result, a bolt (not shown) is inserted into the insertion hole 11 and fastened to a counterpart component (not shown) on the vibration generating side or the vibration receiving side, and the press-fit end 12a1 and the second cylinder portion of the first cylinder part 12a are fixed. When the press-fit end 12b1 of 12b is contacted in the axial direction, the vibration isolation base 30 is compressed in the axial direction from one side and the other side of the through hole 31 by the first flange portion 12a and the second flange portion 12b. The As a result, an axial preload can be applied to the vibration isolating base 30, the spring constant of the vibration isolating base 30 can be increased, and the fracture life of the vibration isolating base 30 can be improved.

  In addition, the first flange portion 13 and the second flange portion 14 compress the protrusions 33 protruding from both ends in the axial direction inside the recess 32 of the vibration isolation base 30. Furthermore, since the depth in the axial direction of the recess 32 of the vibration isolating base 30 is set to be larger than the compression amount by the first flange portion 13 and the second flange portion 14, after preloading the vibration isolating base 30. The recess 32 can be secured. As a result, it is possible to ensure the effect of reducing stress concentration and distortion of the vibration-proof base 30 by the recess 32.

  In addition, in the state before the vibration isolator 1 is fastened and fixed to the vibration generation side or vibration receiving side member, the press-fit end 12a1 of the first tube portion 12a and the press-fit end 12b1 of the second tube portion 12b are in the axial direction. Not abutted. In this state, since the vibration-proof base 30 is not compressed in the axial direction, almost no force is generated to push the first cylindrical portion 12a and the second cylindrical portion 12b in the axial direction of the through hole 31. Since the compression force in the direction perpendicular to the axis is applied to the first cylindrical portion 12a and the second cylindrical portion 12b by the vibration isolating base 30, before the first cylindrical portion 12a and the second cylindrical portion 12b are fastened and fixed to the vibration generating side or vibration receiving side member, It can avoid that the cylinder part 12a and the 2nd cylinder part 12b fall out of the through-hole 31. FIG.

  Moreover, since the outer surface of the inner cylinder member 10 (the first cylinder portion 12a and the second cylinder portion 12b) is restrained in a non-bonded state with the inner surface of the through hole 31 of the vibration isolation base 30, the outer surface of the inner cylinder member 10 The step of applying the adhesive can be omitted. As a result, it is possible to prevent the adhesive from adhering to the inner cylinder member 10, and since the inner cylinder member 10 and the rubber-like elastic body are not vulcanized and bonded, it is possible to prevent rubber burrs from adhering to the inner cylinder member 10.

  Further, the vibration isolating substrate 30 may cause fatigue failure in the vicinity of the adhesion interface due to the force acting in the axial direction during use, but the outer surface of the inner cylinder member 10 and the vibration isolating substrate 30 (through hole 31) are Since no adhesive interface is formed between them, the distortion of the vibration-proof substrate 30 can be reduced, and the fracture life of the vibration-proof substrate 30 can be improved.

  In addition, when the outer surface of the inner cylinder member 10 (the 1st cylinder part 12a and the 2nd cylinder part 12b) is restrained with the inner surface of the through-hole 31 of the anti-vibration base | substrate 30, a non-adhesion state, the outer cylinder member 20 or an inner cylinder member 10, the inner cylinder member 10 tends to be displaced in the axial direction with respect to the vibration isolation base 30, so that the spring constant in the axial direction tends to decrease. However, since the spring constant in the axial direction can be increased by preloading the vibration isolation base 30 with the first flange portion 13 and the second flange portion 14, the inner cylinder member 10 and the vibration isolation base 30 are in a non-contact state. The fall of the spring constant by this can be prevented.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, about the case where the inner cylinder member 10 is provided with the 1st cylinder part 12a in which the 1st flange part 13 is protrudingly provided, and the 2nd cylinder part 12b in which the 2nd flange part 14 is protrudingly provided. explained. On the other hand, in the second embodiment, the inner cylinder member 110 includes a third cylinder part 112 on which the first flange part 113 is projected, and the second flange part 114 is attached to the third cylinder part 112. A description will be given of the case. In addition, the same part as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description.

  FIG. 3A is an axial sectional view of the vibration isolator 101 according to the second embodiment, and FIG. 3B is an axial sectional view of the inner cylinder member 110. As shown in FIG. 3A, the vibration isolator 101 includes an outer cylinder member 20, a vibration isolation base 30 (hereinafter referred to as “intermediate product S”) bonded to the inner surface of the outer cylinder member 20, and a shaft of the vibration isolation base 30. And an inner cylinder member 110 having a cylinder part (third cylinder part 112) connected to a through hole 31 that is formed to penetrate in the direction.

  As shown in FIG. 3B, the inner cylinder member 110 is formed in a cylindrical shape, and has a third cylinder portion 112 whose one end is press-fitted into the through hole 31 (see FIG. 3A), and the third cylinder. A first flange portion 113 projecting on the other end side of the third tube portion 112 with an outer edge protruding in a direction intersecting the axial direction with respect to the outer periphery of the portion 112 and attached to one end side of the third tube portion 112 The second flange portion 114 is provided.

  The third cylindrical portion 112 has an outer diameter D3 set to a value larger than the inner diameter D1 of the through hole 31 formed in the intermediate product S (see FIG. 2A). The second flange portion 114 is a ring-shaped member in which an attachment portion 114 a attached to the third cylinder portion 112 is formed. In the present embodiment, the attachment portion 114 a is formed so as to be fitted to the outer periphery 112 a of the third cylinder portion 112. The length L4 from the first flange portion 113 to the second flange portion 114 when the second flange portion 114 is attached to the third tube portion 112 is the length in the axial direction of the through hole 31 of the intermediate product S. It is set smaller than L3. Furthermore, the first flange 113 and the second flange 114 are formed so that the entire circumference protrudes in a direction perpendicular to the axial direction with respect to the outer periphery 112 a of the third cylindrical portion 112.

  In order to manufacture the vibration isolator 101, one end side (the opposite side of the first flange portion 113) of the third cylindrical portion 112 in which the first flange portion 113 protrudes from the other end side is formed as a through hole of the intermediate product S. It press-fits from one side of 31, and projects one end side of the third cylindrical portion 112 from the other side of the through hole 31. And the attachment part 114a is fitted to the one end side of the 3rd cylinder part 112 protruded from the other side of the through-hole 31, and the 2nd flange part 114 is attached. Since the third cylindrical portion 112 is press-fitted from one side of the through hole 31, the third cylindrical portion 112 can be connected to the through hole 31 without vulcanizing and bonding the outer periphery 112 a of the third cylindrical portion 112 and the vibration isolation base. Restrained at the inner surface. Thereby, it can prevent that the tensile strain accompanying the cure shrinkage of a rubber-like elastic body arises in the interface of the 3rd cylinder part 112 and the vibration proof base 30. FIG.

  Furthermore, since the inner diameter D1 (see FIG. 2A) of the through hole 31 is set to a value smaller than the outer diameter D3 of the third cylindrical portion 112, the third cylindrical portion 112 is press-fitted into the through hole 31. Thus, the diameter of the through hole 31 is increased, and the vibration isolation base 30 is compressed between the third cylindrical portion 112 and the outer cylindrical member 20. As a result, a compressive force can be applied to the bonding interface between the inner surface of the outer cylinder member 20 and the vibration-proof substrate 30. Therefore, the tensile strain generated at the bonding interface between the inner surface of the outer cylinder member 20 and the vibration isolation base 30 can be removed, and the durability of the vibration isolation device 101 can be improved.

  Further, the inner cylinder member 110 is press-fitted into the through-hole 31 without drawing the outer cylinder member 20, thereby bonding the inner surface 21 (see FIG. 2A) of the outer cylinder member 20 and the vibration isolation base 30. Since the tensile strain at the interface can be removed, drawing of the outer cylinder member 20 can be omitted. Therefore, also for the vibration isolator 101 that directly vulcanizes and bonds the rubber-like elastic body to the outer cylinder member 20, the tensile strain at the bonding interface can be removed without drawing the outer cylinder member 20, and the vibration isolator The durability of 101 can be improved.

  In addition, the third cylinder portion 112 press-fitted from one side (the left side in FIG. 3A) of the through hole 31 by the first flange portion 113 protruding from the other end side of the third cylinder portion 112 is formed in the through hole. It can prevent falling off from the other side of 31 (right side of FIG. 3A). Furthermore, since the second flange portion 114 is attached to one end side of the third cylindrical portion 112 protruding from the other side of the through hole 31, the third cylindrical portion 112 is also prevented from falling off from one side of the through hole 31. it can.

  Moreover, since the rigid bodies of the second flange portion 114 (attachment portion 114a) and the third cylinder portion 112 are attached to each other, the connection between the second flange portion 114 and the third cylinder portion 112 can be strengthened. Thereby, it is possible to prevent the second flange portion 114 from dropping from the third cylinder portion 112. Thereby, it is possible to reliably prevent the inner cylinder member 110 press-fitted into the through hole 31 from dropping from the through hole 31.

  Further, since the cylindrical portion (third cylindrical portion 112) is provided so as to penetrate from one side to the other side of the through hole 31, it is prevented that a seam (step) is formed on the inner surface of the insertion hole 11. As a result, when a bolt for fastening and fixing to a vibration generating side or vibration receiving side member (not shown) is inserted into the insertion hole 11 and fastened, problems such as the bolt being caught at the seam are prevented. , Bolt insertion workability and fastening workability can be improved.

  Moreover, since the 3rd cylinder part 112 which comprises a cylinder part consists of another member with the 2nd flange part 114, without letting the 1st flange part 113 and the 2nd flange part 114 pass the inner side of the through-hole 31, it is 3rd. The cylindrical portion 112 can be press-fitted into the through hole 31. Since the 3rd cylinder part 112 can be press-fit even if it does not expand the through-hole 31 to the magnitude | size which can pass the 1st flange part 113 and the 2nd flange part 114, press-fit workability | operativity can be improved. Further, since the outer edges of the first flange portion 113 and the second flange portion 114 can be formed so as to largely protrude from the inner peripheral edge of the through hole 31, the press-fitted inner cylinder member 110 drops from the through hole 31. Can be surely prevented.

  The length L4 from the first flange portion 113 to the second flange portion 114 when the second flange portion 114 is attached to the third tube portion 112 is the length in the axial direction of the through hole 31 of the intermediate product S. It is set smaller than L3 (see FIG. 2A). Further, the first flange portion 113 and the second flange portion 114 are formed so that the entire circumference protrudes in a direction perpendicular to the axial direction with respect to the outer circumference of the third cylinder portion 112. Thereby, the vibration isolating base 30 is compressed in the axial direction from the one side and the other side of the through hole 31 by the first flange portion 113 and the second flange portion 114. As a result, an axial preload can be applied to the vibration isolating base 30, the spring constant of the vibration isolating base 30 can be increased, and the fracture life of the vibration isolating base 30 can be improved.

  Further, the first flange portion 113 and the second flange portion 114 compress the projecting portions 33 projecting at both axial ends inside the recess 32 of the vibration isolating base 30, so that the recess 32 of the vibration isolating base 30 in the axial direction is compressed. Since the depth is set to be larger than the compression amount by the first flange portion 113 and the second flange portion 114, the recess 32 of the vibration isolation base 30 can be secured. As a result, it is possible to ensure the effect of reducing stress concentration and distortion of the vibration-proof base 30 by the recess 32.

  As shown in FIG. 3A, the second flange portion 114 has an attachment position in the third tube portion 112 close to the first flange portion 113 side, and an extra length 112a is provided in the third tube portion 112. It is desirable to be attached. By changing the extra length 112a of the third cylindrical portion 112, the magnitude of the preload applied in the axial direction of the vibration isolation base 30 can be changed, and the degree of freedom of the preload can be improved. Further, by providing the extra length 112a, it is possible to make it difficult for the second flange portion 114 to interfere with the counterpart component (not shown) on the vibration generating side or the vibration receiving side, and the degree of freedom in designing the counterpart component can be improved. .

  Moreover, it is desirable that the one end side of the outer periphery 112a of the third cylindrical portion 112 to which the second flange portion 114 is attached be expanded so that the outer diameter gradually increases as the first flange portion 113 is approached. The second flange portion 114 (attachment portion 114a) can be firmly fixed to the outer periphery 112a of the third tube portion 112 by the wedge effect, and the second flange portion 114 (attachment portion 114a) on one end side of the third tube portion 112 is secured. This is because the amount of press-fitting into the vibration-proof substrate 30 is restricted and the amount of preload applied in the axial direction of the vibration-proof base 30 is restricted.

  Here, since the inner cylinder member 110 (third cylinder portion 112) is restrained in a non-bonded state with the inner surface of the through hole 31 of the vibration isolating base 30, the step of applying an adhesive to the outer surface of the inner cylinder member 110 is performed. Can be omitted. As a result, it is possible to prevent the adhesive from adhering to the inner cylinder member 110, and since the vibration-proof base 30 is not vulcanized and bonded to the inner cylinder member 110, it is possible to prevent rubber burrs from adhering to the inner cylinder member 110.

  In addition, a force acts in the axial direction due to vibration during use and may break near the adhesion interface of the vibration isolating substrate 30, but an adhesion interface is formed between the outer surface of the inner cylinder member 110 and the through hole 31. Therefore, the distortion of the vibration isolating substrate 30 can be reduced, and the fracture life of the vibration isolating substrate 30 can be improved.

  When the outer surface of the inner cylinder member 110 (third cylinder portion 112) is restrained in a non-bonded state with the through-hole 31 of the vibration isolating base, the vibrations input to the outer cylinder member 20 or the inner cylinder member 110 cause internal vibration. Since the cylindrical member 110 is easily displaced in the axial direction with respect to the vibration isolating base 30, there is a tendency that the axial spring constant is reduced. However, since the spring constant in the axial direction can be increased by applying preload to the vibration isolation base 30 by the first flange portion 113 and the second flange portion 114, the inner cylinder member 110 and the vibration isolation base 30 are in a non-contact state. The fall of the spring constant by this can be prevented.

  Next, a third embodiment will be described with reference to FIG. In the first embodiment and the second embodiment, the vibration isolator 1, 101 (in which a rubber-like elastic body is integrally vulcanized and bonded to the outer cylindrical member 20 in which the connecting member 2 (rod) is integrally formed. Torque rod) has been described. On the other hand, in 3rd Embodiment, the bush (vibration isolator 201) manufactured by vulcanizing-bonding a rubber-like elastic body to an outer cylinder metal fitting (outer cylinder member 220) is demonstrated.

  The bushing's outer cylinder fitting (outer cylinder member 220) is press-fitted into an outer cylinder member of a bracket (not shown) that constitutes a torque rod, suspension arm, etc., so that a vibration isolator such as a torque rod, suspension arm, etc. is provided. Can be manufactured. Therefore, in the following embodiment, illustration of the bracket for press-fitting the outer cylinder fitting (outer cylinder member 220) and the outer cylinder member of the bracket is omitted. In addition, the same part as 2nd Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 4A is a plan view of the vibration isolator 201 according to the third embodiment, and FIG. 4B is a cross-sectional view of the vibration isolator 201 along the line IVb-IVb.

  As shown in FIG. 4A, the vibration isolator 201 is positioned on an inner cylinder member 210 attached to a vibration generation side or vibration receiving side member (not shown), and on the outer peripheral side of the inner cylinder member 210. And an anti-vibration base body 30 that is interposed between the outer cylinder member 220 and the inner cylinder member 210 and is made of a rubber-like elastic material. The inner cylinder member 210 is made of a metal material in a cylindrical shape, and is fastened with a bolt to a vibration generation side or vibration receiving side member (not shown) through the insertion hole 11 formed in the center of the inner cylinder member 210. Fixed. The outer cylinder member 220 is made of a metal material in a cylindrical shape, and is positioned on the outer peripheral side of the inner cylinder member 210 at a predetermined interval.

  As shown in FIG. 4B, the third cylinder portion 112 of the inner cylinder member 210 is a portion where one end side (the right side in FIG. 4B) is press-fitted into the through-hole 31, and the first flange on the other end side. A portion 113 is protruded. A stepped portion 211 having a step diameter smaller than that of the outer periphery 112a of the third cylindrical portion 112 is formed on the entire periphery of the edge of the outer peripheral surface on the one end (press-fit end 112b) side of the third cylindrical portion 112. The step portion 211 is a portion where the attachment portion 214a formed on the second flange portion 214 is fitted to the outer peripheral surface. When the attachment portion 214a is fitted to the step portion 211, the step portion 211 intersects the axial direction. The second flange portion 214 is brought into contact with the wall portion 212 along.

  Here, the distance L5 (the distance between the first flange portion 113 and the wall portion 212) between the first flange portion 113 and the second flange portion 214 when the second flange portion 214 is attached to the stepped portion 211 is an internal distance. The length L3 (see FIG. 2A) in the axial direction of the through hole 31 of the vibration isolating base 30 before the cylindrical member 210 is press-fitted is set to be smaller. As a result, the vibration-proof base 30 is compressed in the axial direction from one side and the other side of the through hole 31 by the first flange portion 113 and the second flange portion 214. As a result, an axial preload can be applied to the vibration isolating base 30, the spring constant of the vibration isolating base 30 can be increased, and the fracture life of the vibration isolating base 30 can be improved. Furthermore, since the magnitude of the preload is determined by the distance L5 between the first flange portion 113 and the wall portion 212, variation in the axial spring constant can be suppressed.

  As shown in FIG. 4B, an extra length can be provided in the stepped portion 211 by setting the axial length of the stepped portion 212 to be larger than the thickness of the second flange portion 214 in the axial direction. . Thereby, it is possible to make it difficult for the second flange portion 214 to interfere with the mating part of the vibration generating side or vibration receiving side member (not shown), and the degree of freedom in designing the mating part can be improved.

  Further, since the third cylindrical portion 112 is press-fitted from one side of the through hole 31 (left side in FIG. 4B), the third cylindrical portion 112 and the antivibration base 30 are not vulcanized and bonded. The cylindrical portion 112 is restrained by the through hole 31. Thereby, it can prevent that the tensile strain accompanying the cure shrinkage of a rubber-like elastic body arises in the interface of the 3rd cylinder part 112 and the vibration proof base 30. FIG. Furthermore, since a compressive force can be applied to the adhesion interface between the inner surface of the outer cylinder member 220 and the vibration isolation substrate 30, the tensile strain generated at the adhesion interface between the inner surface of the outer cylinder member 220 and the vibration isolation substrate 30 is removed. The durability of the vibration isolator 201 can be improved.

  In addition, since the inner cylinder member 210 is press-fitted into the through-hole 31 without performing the drawing process on the outer cylinder member 220, the tensile strain at the bonding interface between the inner surface of the outer cylinder member 220 and the vibration isolating base 30 can be removed. Drawing of the outer cylinder member 220 can be omitted. Therefore, it is not necessary to draw the outer cylinder member 220 before press-fitting into a mating part (not shown) that constitutes a torque rod, a suspension arm, etc., and the man-hour related to drawing can be reduced.

  Next, a method for manufacturing the vibration isolator will be described with reference to FIGS. First, the vibration isolator assembling apparatus 301 will be described with reference to FIG. In addition, the same part as 3rd Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 5 is a schematic view of the vibration isolator assembling apparatus 301. As shown in FIG. 5, the assembling apparatus 301 moves up and down between a lower mold 310 and an upper mold 330 fixed to a bolster and a slider of a press apparatus (not shown), and between the lower mold 310 and the upper mold 330. It is configured to include a middle mold 320 that can be arranged.

  FIG. 5 illustrates a state where the outer cylinder member 220 (intermediate product S) to which the vibration-proof base 230 is bonded is placed on the lower mold 310. The anti-vibration base 230 is the same as the anti-vibration base 30 except that the recess 32 is omitted.

  As shown in FIG. 5, the lower mold 310 is a member on which the outer cylinder member 220 (intermediate product S) to which the vibration isolation base 230 is bonded is placed, and one axial end portion of the outer cylinder member 220 is placed. A positioning recess 311 is formed on the upper surface. Further, the lower mold 310 is formed with a circular lower hole portion 312 penetrating from the center of the bottom surface of the recess 311 to the lower surface of the lower mold 310. The inner diameter of the lower hole portion 312 is formed to be slightly larger than the outer diameter of the second flange portion 214 (see FIG. 4B). An annular elevating body 313 is accommodated inside the lower hole portion 312, and the elevating body 313 is configured to be able to move up and down in the lower hole portion 312. The elevating body 313 is formed with an intrusion hole 314 into which a support portion 332 described later enters.

  The middle mold 320 is a member for fixing the outer cylinder member 220 (intermediate product S) placed on the lower mold 310, and the axial direction of the outer cylinder member 220 (intermediate product S) placed on the lower mold 310. A housing portion 321 in which the other end portion is housed is recessed in the lower surface. Further, the middle mold 320 is formed with an upper hole portion 322 that penetrates from the center of the upper surface of the housing portion 321 to the upper surface of the middle mold 320. The inner diameter of the upper hole 322 is set to be approximately the same size as the inner peripheral diameter D4 (see FIG. 4B) of the outer cylinder member 220. By forming the upper hole portion 322, a shoulder portion 323 that can be brought into contact with the other axial end portion of the outer cylinder member 220 is formed on the upper surface of the housing portion 321.

  The upper mold 330 is a member for pressing down the inner cylinder member 210 (third cylinder portion 112) and press-fitting it into the through hole 31, and presses the end portion (first flange portion 113) of the inner cylinder member 210 with the lower surface. And a pressing plate 331 that pushes down the inner cylinder member 210 (third cylinder portion 112) and a rod-like support portion 332 that is suspended from the lower surface of the pressing plate 331. The support portion 332 is a member for supporting and temporarily fixing the inner cylinder member 210 (third cylinder portion 112) press-fitted into the through-hole 31, so that the support portion 332 can be inserted into the insertion hole 11 of the inner cylinder member 210. The inner diameter of the insertion hole 11 is slightly narrower. A ball plunger 333 is embedded in the outer peripheral surface on the lower end side of the support portion 332 so as to lock the end surface of the inner cylinder member 210 (third cylinder portion 112) through which the support portion 332 is inserted. The upper mold 330 is urged in a direction away from the middle mold 320 by a spring 334 interposed between the middle mold 320 and the upper mold 330.

  Next, a method for manufacturing the vibration isolator will be described. First, as shown in FIG. 5, the slider of the press device (not shown) is raised to raise the upper die 330 and the middle die 320, and then the first flange portion 113 of the inner cylinder member 210 is raised to the third cylinder. The support portion 332 is inserted into the insertion hole 11 so that the portion 112 faces downward. While the support portion 332 is inserted into the inner cylinder member 210, the ball plunger 333 is pushed in by the inner surface of the insertion hole 11 of the inner cylinder member 210 and protrudes when the lower end of the inner cylinder member 210 passes. Thereby, the inner cylinder member 210 is temporarily fixed to the support part 332 in the state by which the support part 332 was penetrated, without falling.

  Further, the elevating body 313 of the lower mold 310 is lowered and placed on the upper surface of the elevating body 313 so that the axial direction of the second flange portion 214 is directed upward and downward. Next, the outer cylinder member 220 (intermediate product S) to which the vibration-proof base 230 is bonded is placed in the recess 311 so that the axial direction is vertically directed. Note that the inner diameter of the through hole 31 of the intermediate product S is set to be larger than the inner diameter of the second flange portion 214 (attachment portion 214a).

  Further description will be given with reference to FIG. 6A is a schematic diagram showing a state in which the outer cylinder member 220 is fixed to the assembling apparatus 301, and FIG. 6B is a schematic diagram showing a state in which the vibration isolator base 230 is deformed by raising the elevating body 313. FIG. FIG. 6C is a schematic diagram showing a state in which the cylindrical portion 112 is press-fitted into the vibration isolation base 230, and FIG. 6D is a schematic diagram showing a state in which the elevating body 313 is lowered.

  After placing the second flange portion 214 and the intermediate product S on the lower die 310 (see FIG. 5), the upper die 330 and the middle die 320 are lowered as shown in FIG. The shoulder portion 323 of the middle mold 320 is brought into contact with the portion (outer cylinder member holding step). Next, as shown in FIG. 6B, the elevating body 313 is raised. Since the inner diameter of the through-hole 31 is set to be larger than the inner diameter of the second flange portion 214 (attachment portion 214a), when the elevating body 313 is raised, the periphery of the through-hole 31 (anti-vibration base 230). ) Is pressed against the second flange portion 214. When the elevating body 313 is further raised, the shoulder portion 323 of the middle mold 320 is in contact with the axial end portion of the outer cylinder member 220, so that the peripheral edge (vibration isolation base 230) of the through hole 31 is pressed upward. The anti-vibration base 230 is deformed and the diameter of the upper end side of the through hole 31 is increased (vibration-proof base pressing step). In addition, since the accommodating part 321 is formed in the intermediate | middle mold | type 320, when the anti-vibration base | substrate 230 deform | transforms by the raising of the raising / lowering body 313, the position shift of the horizontal direction may arise in the outer cylinder member 220 (intermediate product S). Is prevented.

  Next, as shown in FIG. 6C, the upper mold 330 is lowered, and the support portion 332 is lowered toward the through hole 31. The upper mold 330 is lowered while compressing the spring 334. When friction occurs between the lowered inner cylinder member 210 and the through hole 31, the lower end surface of the inner cylinder member 210 leaves the ball plunger 333, but the upper end surface (first flange portion 113) of the inner cylinder member 210 is a pressing plate. When contacting the lower surface of 331, the inner cylinder member 210 is pushed down as the pressing plate 331 is lowered. Since the inner cylinder member 210 is provided with the support portion 332, the inner cylinder member 210 is press-fitted into the through hole 31 without being displaced or bent. Further, the lower end side of the support portion 332 that is pushed down as the upper die 330 is lowered enters the intrusion hole 314 of the elevating body 313, while the inner cylinder member 210 is pressed by the pressing plate 331, and the step at the tip of the third cylinder portion 112. The part 211 is press-fitted into the attachment part 214a (second flange part 214) (inner cylinder member press-fitting process).

  Next, as shown in FIG. 6D, the elevating body 313 is lowered, and the force acting upward on the periphery (vibration-proof base 230) of the through hole 31 is released (press release process). Accordingly, the vibration isolation base 230 can be brought into close contact with the inner cylinder member 210 (third cylinder portion 112), and the position of the inner cylinder member 210 (third cylinder portion 112) press-fitted into the through hole 31 is determined. Finally, the upper mold 330 and the middle mold 320 are raised, and the vibration isolator into which the inner cylinder member 210 is press-fitted is taken out from the assembly apparatus 301.

  According to the manufacturing method of the vibration isolator as described above, after holding the outer cylinder member 220, the peripheral edge of the through hole 31 (upward in FIG. 5) in the opposite direction (upward in FIG. 5) of the inner cylinder member 210 (downward in FIG. 5). By pressing the anti-vibration base body 230) in the axial direction (vibration-proof base body pressing step), the through hole 31 can be deformed so that the side facing the press-fitting direction of the inner cylinder member 210 (upper side in FIG. 5) is expanded. it can. Thereby, the inner cylinder member 210 can be easily press-fitted into the through hole 31, and the press-fitting workability can be improved. Furthermore, when the inner cylinder member 210 is press-fitted, it is possible to prevent the vibration-proof base 230 from being deformed due to the friction between the outer surface of the inner cylinder member 210 and the through-hole 31 in the press-fitting direction.

  Here, when the inner cylinder member 210 is press-fitted without pressing the peripheral edge of the through-hole 31 in the axial direction in the direction opposite to the press-fitting direction of the inner cylinder member 210, the friction between the outer surface of the inner cylinder member 210 and the through-hole 31. As a result, the anti-vibration base 230 is dragged in the press-fitting direction, and the anti-vibration base 230 is deformed. Due to the deformation of the vibration isolation base 230, an axial reaction force (elastic force of the vibration isolation base 230) acts in a direction opposite to the press-fitting direction of the inner cylinder member 210, and the vibration isolation base 230 is distorted in a complicated manner. There is a problem that the press-fitting of 210 is hindered and the position of the press-fitted inner cylinder member 210 is difficult to determine.

  On the other hand, according to the manufacturing method of the vibration isolator in the present embodiment, the peripheral edge of the through hole 31 is pressed in the direction opposite to the press-fitting direction of the inner cylinder member 210, thereby being dragged by the press-fitting of the inner cylinder member 210. Thus, the vibration-proof base 230 can be prevented from being deformed in the axial direction. As a result, the axial reaction force of the vibration isolation base 230 acting on the press-fitted inner cylinder member 210 can be restricted, and the press-fit workability of the inner cylinder member 210 can be improved.

  In addition, by pressing the peripheral edge (vibration isolation base 230) of the through hole 31 in the axial direction opposite to the press-fitting direction of the inner cylinder member 210, distortion in the press-fitting direction of the inner cylinder member 210 generated in the vibration isolation base 230 is reduced. On the other hand, the strain in the direction opposite to the press-fitting direction can be increased. Then, when the inner cylinder member 210 is press-fitted into the through hole 31, release of the peripheral edge of the through hole 31 (press release process) causes the vibration isolation base 230 to be deformed (restored) in a direction in which the axial strain is reduced. The through hole 31 comes into close contact with the inner cylinder member 210, and the position of the inner cylinder member 210 is determined. By simplifying the direction of strain generated in the vibration isolation base 230, it is possible to predict the amount of axial deformation of the vibration isolation base 230 when the peripheral edge of the through hole 31 (vibration isolation base 230) is released. As a result, the position of the inner cylinder member 210 press-fitted into the through hole 31 can be easily determined.

  Moreover, since the periphery (vibration-proof base 230) of the through-hole 31 is pressed using the 2nd flange part 214 attached to the 3rd cylinder part 112 of the inner cylinder member 210, in order to press the periphery of the through-hole 31 There is no need to prepare separate parts, and the number of prepared parts can be reduced. Furthermore, since the vibration isolator is manufactured by press-fitting the third cylindrical portion 112 into the through hole 31 and attaching the second flange portion 214, the production efficiency of the vibration isolator can be improved.

  Further, since the stepped portion 211 is formed at the edge of the outer peripheral surface of the press-fitting end 112b (see FIG. 4B) of the third cylindrical portion 112, the inner diameter of the attachment portion 214a can be reduced accordingly. As a result, the radial thickness (the left-right direction in FIG. 5) of the second flange portion 214 can be increased. As a result, the periphery of the through hole 31 (vibration isolation base 230) can be pressed by the large surface of the second flange portion 214, and the load can be distributed to the periphery of the through hole 31. As a result, it is difficult to cause a problem that the peripheral edge of the through hole 31 is damaged or a load cannot be applied to the vibration isolation base 230.

  Next, a fourth embodiment will be described with reference to FIG. In the first to third embodiments, the case where the solid vibration-proof base 30 is interposed between the inner cylinder members 10, 110, 210 and the outer cylinder members 20, 220 has been described. On the other hand, in the fourth embodiment, a case will be described in which a straight portion 432 (vacant space) penetrating in the axial direction is formed in the vibration-proof base 430. Further, in the fourth embodiment, chamfered portions 411 and 412 are formed on the entire circumference of the outer peripheral surface of the first cylindrical portion 12a and the second cylindrical portion 12b of the inner cylindrical member 410 at the distal end (pressed end) on the press-fitting side. The case where this is done will be described. The same parts as those in the first embodiment or the third embodiment are denoted by the same reference numerals, and the following description is omitted. FIG. 7A is a plan view of the vibration isolator 401 in the fourth embodiment, and FIG. 7B is a cross-sectional view of the vibration isolator 401 along the line VIIb-VIIb.

  As shown in FIG. 7A, the vibration isolator 401 is positioned on the outer cylinder side of the inner cylinder member 410 attached to a vibration generation side or vibration receiving side member (not shown). And an anti-vibration base 430 that is interposed between the outer cylinder member 220 and the inner cylinder member 410 and is made of a rubber-like elastic material.

  The anti-vibration base 430 is formed with a pair of straight portions 432 penetrating in the axial direction at positions opposed to the axis perpendicular direction with the inner cylinder member 410 interposed therebetween. Thereby, the spring constant in the direction perpendicular to the axis of the vibration isolator 401 can be made different between the direction in which the straight portions 432 face each other and the direction orthogonal thereto.

  As shown in FIG. 7 (b), the inner cylinder member 410 has the entire circumference of the edge of the outer peripheral surface of the first cylinder part 12a and the second cylinder part that are press-fitted into the through-hole 431 at the press-fitting side tip (press-fit end). Chamfered portions 411 and 412 are formed on the surface. By forming the chamfered portions 411 and 412 at the edges of the first cylindrical portion 12a and the second cylindrical portion 12b, the first cylindrical portion 12a and the second cylindrical portion 12b can be easily press-fitted into the through hole 431. The press-fit workability of the inner cylinder member 410 can be improved.

  Further, when the first cylinder part 12 a and the second cylinder part 12 b are in contact with each other in the axial direction in the through hole 431, a recess is formed by the chamfered parts 411 and 412. The recess formed by the chamfered portions 411 and 412 is compressed when the first cylindrical portion 12a and the second cylindrical portion 12b are press-fitted from one side and the other side of the through-hole 431, and is formed on the inner surface side of the through-hole 431. A deformed (escaped) rubber-like elastic body can be received.

  Here, when the chamfered portions 411 and 412 are not formed at the edge, the first cylindrical portion 12a and the second cylindrical portion 12b are press-fitted from one side and the other side of the through-hole 431 to penetrate the rubber-like elastic body. If the inner surface of the hole 431 is deformed, a rubber-like elastic body may be caught between the mating surfaces (press-fit end surfaces). In this case, when the bolt is fastened to a vibration generation side or vibration receiving side member (not shown), the first cylindrical portion 12a and the second cylindrical portion 12b are not brought into contact with each other in the axial direction because a rubber-like elastic body is interposed. . In this state, there is a possibility that the bolt is likely to loosen during use due to the elastic force of the rubber-like elastic body that is bitten.

  On the other hand, according to the present embodiment, since the recess is formed by the chamfered portions 411 and 412, it is possible to prevent the rubber-like elastic body from being caught between the mating surfaces (press-fit end surfaces), and the first tube portion 12a and the 2nd cylinder part 12b can be made to contact | abut reliably in the axial direction within the through-hole 431. FIG. Thereby, there is no possibility that the rubber-like elastic body is interposed between the mating surfaces (press-fit end surfaces), and the bolts fastened and fixed are prevented from being easily loosened during use.

  Next, a fifth embodiment will be described with reference to FIG. In the fourth embodiment, when the chamfered portions 411 and 412 are formed on the entire periphery of the outer peripheral surface of the distal end on the press-fitting side of the first cylindrical portion 12a and the second cylindrical portion 12b of the inner cylindrical member 410. Explained. In the fifth embodiment, instead of the chamfered portions 411 and 412, a case will be described in which rubber escape recesses 511 and 512 are formed on the outer periphery of the first tube portion 12a and the second tube portion 12b on the press-fitting side. . The same parts as those in the first embodiment or the third embodiment are denoted by the same reference numerals, and the following description is omitted. FIG. 8A is an axial sectional view of the vibration isolator 501 according to the fifth embodiment.

  As shown in FIG. 8 (a), the inner cylinder member 510 has rubber escape recesses 511, 512 on the outer periphery of the first cylinder part 12a and the second cylinder part 12b that are press-fitted into the through hole 31. Is formed. The rubber escape recesses 511 and 512 are formed so as to be smoothly continuous with the outer peripheral cylindrical surfaces of the first cylindrical portion 12a and the second cylindrical portion 12b, and the outer diameter gradually decreases toward the press-fit end (tip). Inclined portions 511a and 512a, and small-diameter portions 511b and 512b connected to the press-fit end sides of the inclined portions 511a and 512a and formed in a cylindrical shape having a substantially constant outer diameter.

  As described above, the inner cylinder member 510 is formed with the inclined portions 511 and 512 that are smoothly continuous with the outer cylindrical surface on the press-fitting side of the first cylinder portion 12a and the second cylinder portion 12b. Smooth press-fitting becomes possible. Further, since the rubber escape recesses 511 and 512 are formed on the outer periphery of the first cylinder part 12a and the second cylinder part 12b on the press-fitting side, the rubber-like elastic body deformed on the inner surface of the through hole 31 is used for rubber escape. Receiving in the recesses 511 and 512, it is possible to prevent the rubber-like elastic body from being caught between the mating surfaces (press-fit end surfaces). As a result, similar to the fourth embodiment, the mating surface (press-fit end surface) can be contacted in the axial direction, and the bolt fastened and fixed to the mating part can be prevented from loosening during use. Further, since the rubber escape recesses 511 and 512 are provided with the small diameter portions 511b and 512b, the capacity of the acceptable rubber-like elastic body can be increased. In particular, it is advantageous when a rubber-like elastic body having a small spring constant and a large deformation amount is used.

  Next, a sixth embodiment will be described with reference to FIG. 5th Embodiment demonstrated the case where the recesses 511 and 512 for rubber escape were formed in the outer periphery of the press injection side of the 1st cylinder part 12a and the 2nd cylinder part 12b. In the sixth embodiment, a case where chamfered portions 611 and 612 are further formed will be described. Note that the same parts as those in the fifth embodiment are denoted by the same reference numerals, and the following description is omitted. FIG. 8B is an axial sectional view of the vibration isolator 601 according to the sixth embodiment.

  As shown in FIG. 8B, the inner cylinder member 610 of the vibration isolator 601 has chamfered portions 611 and 612 formed on the entire periphery of the outer edge of the rubber escape recesses 511 and 512. Since the recesses are formed by the chamfered portions 611 and 612, it is possible to prevent the rubber-like elastic body from being caught between the mating surfaces (press-fit end surfaces), and the first cylindrical portion 12a and the second cylindrical portion 12b are passed through the through-hole 31. It can be made to contact reliably in an axial direction. Thereby, there is no possibility that the rubber-like elastic body is interposed between the mating surfaces (press-fit end surfaces), and it is possible to prevent the bolt fastened and fixed to the mating part (not shown) from being easily loosened during use.

  Next, a seventh embodiment will be described with reference to FIG. In 2nd Embodiment, the case where the outer periphery 112a of the 3rd cylinder part 112 of the inner cylinder member 110 was formed in the cylindrical shape was demonstrated. On the other hand, in the seventh embodiment, a case where a chamfered portion 711 is formed on the entire circumference of the outer peripheral surface of the distal end (press-fit end 112a) of the third tube portion 112 of the inner tube member 710. explain. The same parts as those in the second embodiment or the sixth embodiment are denoted by the same reference numerals, and the following description is omitted. FIG. 8C is an axial sectional view of the vibration isolator 701 according to the seventh embodiment.

  As shown in FIG. 8C, the inner cylinder member 710 of the vibration isolator 701 has a chamfered portion 711 formed on the entire circumference of the press-fitting side tip (press-fit end 112 a) of the third cylinder portion 112. A second flange portion 114 is attached to the outer peripheral surface of the third cylindrical portion 112 on the first flange portion 113 side from the chamfered portion 711. By forming the chamfered portion 711, the third cylindrical portion 112 can be easily press-fitted into the through hole 31. Further, since the chamfered portion 711 is provided, the third cylindrical portion 112 can be easily press-fitted into the second flange portion 114. As a result, the press-fitting workability of the inner cylinder member 710 (third cylinder part 112) can be improved.

  Next, with reference to FIG. 9A to FIG. 9C, the eighth to tenth embodiments will be described. In the first to seventh embodiments, the case where the inner cylinder members 10, 110, 210, 410, 510, 610, and 710 are constituted by a plurality of members has been described. On the other hand, in the eighth embodiment to the tenth embodiment, the case where the inner cylinder members 810, 910, and 1010 are constituted by one member will be described. In addition, the same part as 3rd Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 9A illustrates an eighth embodiment.

  As shown in FIG. 9A, the inner cylinder member 810 of the vibration isolator 801 includes a cylindrical cylinder portion 811 formed around an insertion hole 11 that penetrates in the axial direction. The vibration isolator 801 is manufactured by press-fitting the cylindrical portion 811 from the press-fit end 811 a into the through hole 31 of the vibration-proof base 30. In the vibration isolator 801, since the inner cylinder member 810 is formed of one member, the number of parts can be reduced.

  Next, a ninth embodiment will be described with reference to FIG. 9th Embodiment demonstrates the case where the chamfering part 911 is formed in the press-fit end 811a of the inner cylinder member 910. FIG. In addition, the same part as 8th Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 9B is an axial sectional view of the vibration isolator 901 according to the ninth embodiment.

  As shown in FIG. 9B, the inner cylinder member 910 of the vibration isolator 901 has a chamfered portion 911 formed on the entire outer periphery of the end edge (press-fit end 811 a) of the cylinder portion 811. Thereby, the cylinder part 811 can be easily press-fitted into the through-hole 31 and the press-fitting workability of the inner cylinder member 910 (cylinder part 811) can be improved.

  Next, a tenth embodiment will be described with reference to FIG. In the eighth embodiment and the ninth embodiment, the case where the outer peripheral surface of the cylindrical portion 811 is formed smoothly has been described. In contrast, in the tenth embodiment, a case where irregularities are formed on the outer peripheral surface of the cylindrical portion 811 will be described. In addition, the same part as 8th Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 9C is an axial sectional view of the vibration isolator 1001 according to the tenth embodiment.

  As shown in FIG. 9C, the inner cylinder member 1010 of the vibration isolator 1001 is formed in a cylindrical shape and is press-fitted into the through-hole 31 from the press-fit end 811 a and penetrates the vibration-proof base 30. And an outer edge of the cylindrical portion 811 that protrudes at the end opposite to the press-fit end 811a with the outer edge protruding in the direction intersecting the axial direction, and the outer periphery of the cylindrical portion 811 near the press-fit end 811a 811b and a protruding portion 1012 formed so as to protrude in the shape perpendicular to the axis in a direction perpendicular to the axis, and a tapered portion 1013 formed in a tapered shape so that the outer diameter gradually decreases from the protruding portion 1012 to the press-fit end 811a. Has been. Further, the inclination angle of the overhanging portion 1012 with respect to the axis of the inner cylinder member 1010 is set to be larger than the inclination angle of the tapered portion 1013 with respect to the axis.

  According to the vibration isolator 1001 configured as described above, since the inner cylinder member 1010 includes the tapered portion 1013, the cylinder portion 811 can be easily press-fitted into the through hole 31 and the press-fit workability is improved. it can. Further, since the flange portion 1011 and the overhang portion 1012 are provided, the inner cylinder member 1010 press-fitted into the through hole 31 can be made difficult to drop off. As described above, the vibration isolator 1001 can improve the press-fit workability of the inner cylinder member 1010 and can prevent the inner cylinder member 1010 from dropping off.

  Next, the manufacturing method of the vibration isolator using the assembly apparatus 301 is demonstrated with reference to FIG. In addition, the same part as 8th Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 10A is a schematic view showing a state in which the outer cylinder member 220 and the cylinder portion 811 to which the vibration isolation base 230 is bonded are set in the assembly apparatus 301, and FIG. 10B is a diagram in which the vibration isolation base 230 is bonded. FIG. 10C is a schematic diagram showing a state in which the elevating body 313 is raised, and FIG. 10D is a cylindrical part 811. It is a schematic diagram which shows the state which press-fitted in the vibration-proof base 230. The anti-vibration base 230 is the same as the anti-vibration base 30 except that the recess 32 is omitted.

  First, as shown in FIG. 10A, the slider of the press device (not shown) is raised to raise the upper die 330 and the middle die 320, and then the support portion 332 is inserted into the insertion hole 11 of the inner cylinder member 810. insert. While the support portion 332 is inserted into the inner cylinder member 810, the ball plunger 333 is pushed in by the inner surface of the insertion hole 11 of the inner cylinder member 810, and protrudes when the lower end of the inner cylinder member 810 passes. Thereby, the inner cylinder member 810 is temporarily fixed to the support part 332 in a state where the support part 332 is inserted without dropping.

  Further, the elevating body 313 of the lower mold 310 is lowered, and the annular portion R formed in a ring shape is fixed to the upper surface of the elevating body 313. Next, the outer cylinder member 220 (intermediate product S) to which the vibration-proof base 230 is bonded is placed in the recess 311 so that the axial direction is vertically directed. The inner diameter of the through hole 31 of the intermediate product S is set to be larger than the inner diameter of the annular portion R. The inner diameter of the annular portion R is set to be larger than the outer diameter of the inner cylindrical member 810 (cylindrical portion 811).

  Next, as shown in FIG. 10B, the upper mold 330 and the middle mold 320 are lowered, and the shoulder 323 of the middle mold 320 is brought into contact with the axial end of the outer cylinder member 220 (outer cylinder member holding step). Next, as shown in FIG. 10C, the elevating body 313 is raised. Since the inner diameter of the through-hole 31 is set to be larger than the inner diameter of the annular portion R, when the elevating body 313 is raised, the annular portion R is pressed against the periphery of the through-hole 31 (vibration isolation base 230). It is done. When the elevating body 313 is further raised, the shoulder portion 323 of the middle mold 320 is in contact with the axial end portion of the outer cylinder member 220, so that the peripheral edge (vibration isolation base 230) of the through hole 31 is pressed upward. The anti-vibration base 230 is deformed and the diameter of the upper end side of the through hole 31 is increased (vibration-proof base pressing step).

  Next, as shown in FIG. 10 (d), the upper mold 330 is lowered, and the inner cylinder member 810 is pressed by the pressing plate 331 to be press-fitted into the through hole 31 (inner cylinder member press-fitting process). Further, the lower end side of the support portion 332 that is pushed down as the upper mold 330 is lowered enters the intrusion hole 314 of the elevating body 313. Further, the inner cylinder member 810 is pressed by the pressing plate 331 to enter the annular portion R and penetrate the through hole 31.

  Next, the elevating body 313 is lowered, and the force acting upward on the peripheral edge (vibration-proof base 230) of the through hole 31 is released (press release process). Thereby, the vibration-proof base 230 can be brought into close contact with the inner cylinder member 810, and the position of the inner cylinder member 810 press-fitted into the through hole 31 is determined. Finally, the upper mold 330 and the middle mold 320 are raised, and the vibration isolator into which the inner cylinder member 810 is press-fitted is taken out from the assembly apparatus 301. According to the method for manufacturing the vibration isolator as described above, the same operation and effect as described above with reference to FIG. 6 can be realized.

  Next, an eleventh embodiment to a fourteenth embodiment will be described with reference to FIGS. In the eighth embodiment to the tenth embodiment, the case where the inner cylinder members 810, 910, 1010 are constituted by one member has been described. In contrast, in the eleventh to fourteenth embodiments, the case where the inner cylinder members 1110, 1210, 1310, and 1410 are constituted by a plurality of members will be described. In addition, the same part as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. Further, in FIGS. 11A to 11D, illustration of the outer cylinder member and the vibration isolating base of each vibration isolator is omitted. First, the inner cylinder member 1110 of the vibration isolator according to the eleventh embodiment will be described with reference to FIG. FIG. 11A is an axial sectional view of the inner cylinder member 1110.

  As shown in FIG. 11A, the inner cylinder member 1110 has the first cylinder part and the second cylinder part constituted by the same member 1111. Therefore, the first cylinder part 1111 will be described, and the second cylinder part will be described. Description of 1111 is omitted. In addition, a 1st cylinder part and a 2nd cylinder part are comprised by the same member 1111, and can reduce a number of parts. Here, the first cylinder portion 1111 is a member that is formed in a cylindrical shape and is press-fitted from a press-fit end 1112 into a through hole (not shown) of the vibration-proof base. The first cylindrical portion 1111 is formed in a tapered shape so that the outer diameter gradually decreases from the protruding portion 1114 toward the press-fit end 1112, and is formed so as to protrude in a hook shape in the direction perpendicular to the axis from the outer periphery. The protruding portion 1114 and the tapered portion 1115 are repeatedly formed. In addition, the inclination angle of the overhanging portion 1114 with respect to the axis of the first tube portion 1111 is set to be larger than the inclination angle of the tapered portion 1115 with respect to the axis.

  According to the inner cylinder member 1110 of the vibration isolator configured as described above, since the tapered part 1115 is provided, the first cylinder part and the second cylinder part 1111 can be easily press-fitted, and the press-fitting workability. Can be improved. In addition, since the overhanging portion 1114 is provided and the press-fit ends 1112 of the first tube portion and the second tube portion 1111 are press-fitted so as to face each other in the axial direction, the press-fitted first tube portion and the second tube portion 1111 are dropped off. It can be difficult.

  Next, the inner cylinder member 1210 of the vibration isolator according to the twelfth embodiment will be described with reference to FIG. FIG. 11B is an axial sectional view of the inner cylinder member 1210. As shown in FIG. 11B, the inner cylinder member 1210 has the first cylinder part and the second cylinder part constituted by the same member 1211. Therefore, the first cylinder part 1211 will be described, and the second cylinder part will be described. The description of 1211 is omitted.

  The first cylindrical portion 1211 is a member that is formed in a cylindrical shape and is press-fitted from a press-fit end 1212 into a through-hole (not shown) of the vibration-proof base, and has a first flange at an end opposite to the press-fit end 1212. A portion 1213 is protruded. The first cylindrical portion 1211 is formed in a tapered shape so that the outer diameter gradually decreases from the protruding portion 1214 toward the press-fit end 1212. The taper portion 1215 and the overhang portion 1214 and the taper portion 1215 are repeatedly formed. Further, a chamfered portion 1216 is formed on the entire circumference of the outer peripheral surface of the press-fit end 1212. In addition, the inclination angle of the overhanging portion 1214 with respect to the axis of the first cylinder portion 1211 is set to be larger than the inclination angle of the tapered portion 1215 with respect to the axis.

  According to the inner cylinder member 1210 of the vibration isolator configured as described above, since the chamfered portion 1216 is formed at the press-fit end 1212, the press-fit workability can be further improved and the rubber-like elastic body deformed by press-fit. To prevent biting at the mating surface. Further, since the first flange portion 1213 and the second flange portion are provided so as to project, preload can be applied in the axial direction of the vibration-proof base.

  Next, an inner cylinder member 1310 of the vibration isolator according to the thirteenth embodiment will be described with reference to FIG. FIG. 11C is an axial sectional view of the inner cylinder member 1310. As shown in FIG. 11C, the inner cylinder member 1310 has the first cylinder part and the second cylinder part formed of the same member 1311. Therefore, the first cylinder part 1311 will be described, and the second cylinder part will be described. The description of 1311 is omitted.

  The first cylindrical portion 1311 is a member that is formed in a cylindrical shape and is press-fitted from a press-fit end 1312 into a through-hole (not shown) of the vibration-proof base, and a first flange is formed at an end opposite to the press-fit end 1312. A portion 1313 is protruded. The first cylindrical portion 1311 includes a cylindrical portion 1314 formed in a cylindrical shape, a protruding portion 1315 formed to protrude from the cylindrical portion 1314 in the shape perpendicular to the axis, and an outer diameter extending from the protruding portion 1315 to the press-fit end 1312. And a tapered portion 1316 which is formed in a tapered shape so as to gradually become smaller.

  According to the inner cylinder member 1310 of the vibration isolator configured as described above, since the tapered portion 1316 is provided, it is possible to receive the rubber-like elastic body deformed by press-fitting and prevent the biting at the mating surface. In addition, since the overhang portion 1315 and the tapered portion 1316 are formed in the vicinity of the press-fit end 1312, even if the number of the overhang portions 1315 and the taper portions 1316 is small, the press-in workability can be improved and the drop-off preventing effect can be improved. Thereby, the processing man-hour of the overhang | projection part 1315 and the taper part 1316 can be reduced.

  Next, the inner cylinder member 1410 of the vibration isolator according to the fourteenth embodiment will be described with reference to FIG. FIG. 11D is an axial sectional view of the inner cylinder member 1410. As shown in FIG. 11 (d), the inner cylinder member 1410 has the first cylinder part and the second cylinder part constituted by the same member 1411. Therefore, the first cylinder part 1411 will be described, and the second cylinder part will be described. Description of 1411 is omitted.

  The first tube portion 1411 is a member that is formed in a cylindrical shape and is press-fitted from a press-fit end 1412 into a through-hole (not shown) of the vibration-proof base, and a first flange is formed at the end opposite to the press-fit end 1412. A portion 1413 is protruded. The first tube portion 1411 is tapered so that the outer diameter gradually decreases from the first overhang portion 1414 toward the press-fit end 1412. A tapered portion 1415 formed in a shape, a second overhanging portion 1416 formed to project from the tapered portion 1415 in the shape of a hook in a direction perpendicular to the axis, and a tapered portion 1415 extending from the second overhanging portion 1416 toward the press-fit end 1412. An inclined portion 1417 formed so that the outer diameter gradually becomes steeper and smaller, a small diameter portion 1418 connected to the press-fit end 1412 side of the inclined portion 1417 and formed in a cylindrical shape having a substantially constant outer diameter, and a small diameter And a chamfered portion 1419 formed on the entire circumference of the press-fit end 1412 of the portion 1418.

  According to the inner cylinder member 1410 of the vibration isolator configured as described above, since the chamfered portion 1419 and the inclined portion 1417 are provided, the press-fitting workability can be improved. Moreover, since the 1st overhang | projection part 1414, the taper part 1415, and the 2nd overhang | projection part 1416 are provided, the drop-off prevention effect can be improved. Further, since the chamfered portion 1419 and the inclined portion 1417 are provided, the rubber-like elastic body deformed by the press-fitting can be received and the biting at the mating surface can be prevented.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the numerical values (for example, the number and size of each component) given in the above embodiment are merely examples, and other numerical values can naturally be adopted.

  In the above-described embodiment, the case where the inner cylinder member and the outer cylinder member are formed of a metal material has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to adopt one formed of a synthetic resin material. It is.

  Although the said embodiment demonstrated the case where the axial direction length of the 1st cylinder part and the 2nd cylinder part of the inner cylinder members 10,410,510,610,1110,1210,1310,1410 was formed equally. However, the present invention is not necessarily limited to this, and it is naturally possible to employ the first tube portion and the second tube portion having different axial lengths.

  In the above embodiment, the case where the inner cylinder members 10, 110, 210, 410, 510, 610, 710, 1110, 1210, 1310, and 1410 are formed in a cylindrical shape has been described. However, the present invention is not necessarily limited to this. Of course, it is possible to adopt one formed in a deformed cylindrical shape, a rectangular tube shape, or the like.

  Although the description has been omitted in the above-described embodiment, it is naturally possible to use the counterpart member on the vibration generating side or the vibration receiving side as the second flange portions 114 and 214 in the inner cylindrical members 110, 210, and 710. . Thereby, the number of parts can be reduced.

  In the said embodiment, although the case where the 2nd flange parts 114 and 214 were attached to the 3rd cylinder part 112 by press-fitting in the inner cylinder members 110, 210, and 710 was not necessarily restricted to this, Of course, it can be attached by other means. Examples of other means include screwing and welding.

  Naturally, it is possible to manufacture the vibration isolator (torque rod, bush, etc.) by replacing the inner cylindrical members in the first to fourteenth embodiments described in the above embodiments with each other.

  In the above embodiment, the case where the inner cylinder member is press-fitted into the through-hole of the vibration-proof base and the inner cylinder member is restrained in a non-adhered state has been described. It is naturally possible to apply the adhesive to the inner cylinder member or the through-hole before press-fitting the member and bond the inner cylinder member and the vibration-proof substrate. Thereby, a possibility that an inner cylinder member may drop | omit until it is bolted by the other components of a vibration generation side or a vibration receiving side can be reduced.

Although description is omitted in the above embodiment, when the vibration isolator 1 (see FIG. 1) is manufactured using the assembling apparatus 301 (see FIG. 5), first, the first flange portion 13 is placed on the top. The first cylinder portion 12 a is attached to the support portion 332. And the 1st cylinder part 12a is press-fit from the one side of the through-hole 31 of the vibration isolator base 30. FIG. After changing the upper and lower sides of the outer cylinder member 20, the second cylinder part 12b is mounted on the support part 332 so that the second flange part 14 is on the upper side. Next, the elevating body 313 is raised, and the vibration isolating substrate 30 at the periphery of the through hole 31 is pressed by the first flange portion 13. Next, the 2nd cylinder part 12b is press-fit from the opposite side of the through-hole 31 of the vibration isolator 30. FIG. Also in this case, there is an effect that the press-fit workability of the inner cylinder member 10 can be improved and the position of the press-fitted inner cylinder member 10 can be easily determined.
<Others>
<Means>
The anti-vibration device of the technical idea 1 includes an anti-vibration device including two bushes attached to a vibration generating side and a vibration receiving side, and a connecting member for connecting the two bushes to each other. Each is formed into a cylindrical shape and has an outer cylindrical member connected to the connecting member, a through-hole that is bonded to the inner surface of the outer cylindrical member and is formed to penetrate in the axial direction, and is a rubber-like elastic body And an inner cylinder member having a cylindrical portion which is formed in a cylindrical shape and is press-fitted into the through hole and whose outer surface is constrained by the inner surface of the through hole. .
The anti-vibration device according to the technical idea 2 is the anti-vibration device according to the technical idea 1, wherein the outer cylinder member is formed integrally with the connecting member, and the anti-vibration base is vulcanized and bonded to the outer cylinder member. It is characterized by being.
The vibration isolator according to technical idea 3 is the vibration isolator according to technical idea 1 or 2, wherein the outer diameter of the cylindrical portion gradually decreases from the other end side toward one end that is press-fitted into the through hole. It has one or more of a chamfered portion, an inclined portion, and a tapered portion.
<Effect>
According to the vibration isolator described in the technical idea 1, in the vibration isolator including two bushes attached to the vibration generating side and the vibration receiving side, and a connecting member that connects the two bushes to each other, In each of the two bushes, a vibration-proof base made of a rubber-like elastic body is bonded to the inner surface of the outer cylinder member. The vibration isolating base has a through hole formed so as to penetrate in the axial direction, and the cylindrical portion of the inner cylinder member formed in a cylindrical shape is press-fitted into the through hole of the vibration isolating base. When the cylinder portion is press-fitted into the through hole, the diameter of the through hole is increased, and the vibration-proof base is compressed between the cylinder portion and the outer cylinder member. As a result, a compressive force can be applied to the adhesion interface between the inner surface of the outer cylinder member and the vibration-proof base. Therefore, it is possible to remove the tensile strain at the adhesive interface between the inner surface of the outer cylinder member and the vibration isolating base, and to secure the durability of the vibration isolator.
Furthermore, since the tensile strain at the adhesive interface between the inner surface of the outer cylinder member and the vibration-proof base can be removed without drawing the outer cylinder member, there is an effect that the drawing process of the outer cylinder member can be omitted.
According to the vibration isolator described in the technical idea 2, since the vibration isolating base is vulcanized and bonded to the outer cylinder member, and the outer cylinder member is formed integrally with the connecting member, a bush that is a component is separately prepared. There is no need, and the bushing press-fitting step can be omitted. Thereby, in addition to the effect of the technical idea 1, it is possible to reduce the number of parts and to reduce the number of steps related to the press-fitting process.
In addition, since the outer cylinder member is formed integrally with the connecting member, in order to remove the tensile strain at the adhesive interface between the inner surface of the outer cylinder member and the vibration-proof base, the outer cylinder member is compressed to reduce the diameter. It is difficult to process. However, since the tensile strain at the adhesive interface can be removed by press-fitting the inner cylinder member into the through hole, there is an effect that the durability of the vibration isolator can be ensured.
Furthermore, since the preload in the direction perpendicular to the axis can be applied to the vibration isolation base by press-fitting the inner cylinder member into the through hole, the spring constant in the direction perpendicular to the axis of the vibration isolation device can be increased. Thereby, in addition to the effect of the technical idea 1, there exists an effect which can improve the vibration proof effect at the time of heavy load input.
According to the vibration isolator of the technical idea 3, the cylindrical portion is one or more of a chamfered portion, an inclined portion, and a tapered portion whose outer diameter gradually decreases from the other end side toward one end that is press-fitted into the through hole. have. Thereby, a cylinder part can be press-fitted in a through-hole, making it guide in any one or more of a chamfering part, an inclination part, and a taper part. Thereby, in addition to the effect of the technical idea 1 or 2, there exists an effect which can improve the press fit workability | operativity of an inner cylinder member.

1,101 Vibration isolator 201,401,501,601,701,801,901,1001 Vibration isolator (bush)
2 connecting member 10, 110, 210, 410, 510, 610, 710, 810, 910, 1010, 1110, 1210, 1310, 1410 Inner cylinder member (part of bush)
11 insertion hole 12 cylinder part 12a, 1111, 1211, 1311, 1411 1st cylinder part (a part of cylinder part)
12b, 1111, 1211, 1311, 1411 2nd cylinder part (a part of cylinder part)
112 3rd cylinder part (a part of cylinder part)
20,220 Outer cylinder member (part of bush)
30, 230, 430 Anti-vibration base (part of bush)
31,431 Through hole 411, 412, 611, 612, 711, 911, 1216, 1419 Chamfered portion 511a, 512a, 1417 Inclined portion 511b, 512b, 1418 Small diameter portion 1012, 1114, 1214, 1315, 1414 Overhang portion 1013, 1115 , 1215,1316,1415 tapered portion 1416 second overhang and part (overhang)

Claims (3)

In the vibration isolator comprising two bushes attached to the vibration generating side and the vibration receiving side, and a connecting member for connecting the two bushes to each other,
Each of the two bushes is
An outer cylinder member formed into a cylindrical shape and connected to the connecting member;
An anti-vibration substrate that is bonded to the inner surface of the outer cylindrical member and has a through-hole formed in the axial direction, and is made of a rubber-like elastic body;
An inner cylinder member having a cylindrical portion that is formed into a cylindrical shape and is press-fitted into the through-hole and the outer surface of which is restrained by the inner surface of the through-hole.
The cylinder part is a first cylinder part press-fitted from one side of the through hole;
The first cylinder part is made of a separate member, and includes a second cylinder part press-fitted from the other side of the through hole ,
The first tube portion and the second tube portion include an insertion hole penetrating in the axial direction, and a chamfered portion on the entire circumference of the edge of the outer peripheral surface of the distal end press-fitted into the through hole,
Bolts are inserted into the insertion holes, and each of the two bushings is fastened and fixed to the vibration generating side and the vibration receiving side, and the end surface of the tip of the first tube portion and the end surface of the tip of the second tube portion Are in contact with each other in the axial direction, so that a recess is formed by the chamfered portion,
The recess receives the anti-vibration base that is deformed by press-fitting the first and second cylinders . The first cylindrical portion and the second cylindrical portion are inclined portions whose outer diameters gradually decrease from the other end side toward the respective one ends that are press-fitted into the through holes,
The inclined portion antivibration device according to claim 1, characterized in that it comprises a cylindrical small-diameter portion provided continuously at one end of the. The first cylinder part and the second cylinder part are formed so as to project in a hook shape in the direction perpendicular to the axis from the outer periphery, and are projected into the through hole,
Antivibration device according to claim 1 or 2, characterized in that it comprises a tapered portion whose outer diameter is gradually reduced toward each end to be press-fitted into the through hole from the overhang.

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