JP2012197822A - Vibration damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping device, according to which a structure of a vulcanizing mold can be simplified to reduce cost required for vulcanization forming, and the life of the vulcanizing mold can be extended.SOLUTION: A second filling trace part 24 which is connected to a filling opening when a first filing trace part 14 and a second vibration damping substrate 23 are vulcanized and formed which are connected to the filling opening of the vulcanizing mold when a first vibration damping substrate 13 is vulcanized and formed is disposed at a position enabling visual recognition from one direction along the axial direction of a first bushing 10. The routing of the filling opening of the vulcanizing mold and a gate are simplified and the gate can be hardly clogged with a filled rubber-like elastic material. Consequently, the life of the vulcanizing mold can be improved. Further, as the direction of mold splitting (partitioning) of the vulcanizing mold can be made as one direction, the structure of the vulcanizing mold can be simplified, and cost required for vulcanization molding can be reduced.

Description

  The present invention relates to an anti-vibration device that connects and vibrates a vibration generating side and a vibration receiving side to each other, and more particularly to an anti-vibration device that can simplify the structure of a vulcanization mold and reduce the cost required for vulcanization molding. Is.

  Conventionally, vibration isolators such as a torque rod and a suspension arm that mutually connect the vibration generation side and the vibration receiving side with vibration isolation have been used. As such an anti-vibration device, a first bush and a second bush having rubber elastic bodies interposed between an inner cylinder and an outer cylinder, and a combination in which the first bush and the second bush are connected with their axial directions orthogonal to each other. What is provided with the connection member made from resin is disclosed (patent document 1).

  In the technique disclosed in Patent Literature 1, in order to manufacture a vibration isolator, first, a rubber elastic body is vulcanized and molded, and an inner cylinder is integrally vulcanized and bonded to prepare a first assembly for the first bush. And make a spare assembly for the second bush. Next, these preliminary assemblies are set in a mold. Then, the synthetic resin material is injected into the cavity formed in the mold, and the synthetic resin material and the pre-assembled product are integrally formed, so that the first bush and the second bush are connected by the synthetic resin connecting member. An anti-vibration device can be obtained. However, since the preliminary assembly for the first bush and the second bush is prepared and the vibration isolation device is manufactured by integrally molding the preliminary assembly in the mold, the preliminary assembly is prepared. However, there is a problem that the number of manufacturing steps of the vibration isolator increases.

  Therefore, there is a method of manufacturing a vibration isolator without creating a spare assembly for the first bush and the second bush. In this case, first, a connecting member having outer cylinders connected to both ends is created, and the connecting member and the two inner cylinders are set in a vulcanization mold. Then, the molding material of the rubber elastic body is injected into the cavity for the first bush and the second bush formed between the vulcanization molds (between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder). In addition to vulcanization molding, the inner cylinder and the outer cylinder are vulcanized and bonded together. Thereby, the vibration isolator which connected the 1st bush and the 2nd bush with the connection member can be obtained.

JP 2005-265122 A

  However, in the above prior art, since the axial directions of the first bush and the second bush are orthogonal to each other, the direction of the injection hole of the molding material for vulcanizing the rubber elastic body of the first bush, The direction of the injection hole of the molding material for vulcanizing and molding the 2-bush rubber elastic body was different. Therefore, the routing of the injection hole and the gate are complicated. As a result, there is a problem that the molding material is easily clogged with the complicated gate, the life of the vulcanization mold is reduced, and the cost required for the vulcanization molding is increased.

  In addition, since the direction of the injection hole for injecting the molding material of the first bush is different from the direction of the injection hole for injecting the molding material of the second bush, the direction of mold splitting (division) in the vulcanization mold is The direction of the first bush and the second bush differed by 90 degrees. This complicates the structure of the vulcanization mold and increases the cost of the vulcanization mold, and complicates the molding operation including mold assembly and disassembly, resulting in an increase in the cost required for vulcanization molding. .

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolator capable of simplifying the structure of a vulcanization mold and reducing the cost required for vulcanization molding.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the vibration isolator of claim 1, the first outer cylinder of the first bush and the second outer cylinder of the second bush are connected to both ends of the connecting member, and the axial directions thereof are mutually connected. In the vibration isolator in which the first bush and the second bush are arranged so as to be orthogonal to each other, the first vibration isolating base of the first bush is formed when the first vibration isolating base is vulcanized by a vulcanization mold. The second vibration isolating base of the second bush includes a first injection trace portion connected to the injection hole, and the second vibration isolating base of the second bush is connected to the injection hole when the second vibration isolating base is vulcanized by a vulcanization mold. An injection trace part is provided. Since the first injection trace portion and the second injection trace portion are arranged at positions that can be seen from one direction along the axial direction of the first bush or the second bush, the injection hole of the first vibration isolation substrate and the second vibration isolation substrate Can be provided in one direction along the axial direction of the first bush or the second bush. As a result, the routing of the injection hole of the vulcanization mold and the gate can be simplified. Thereby, it is possible to prevent clogging of the molding material such as the rubber-like elastic material with the gate. Thereby, the lifetime of the vulcanization mold can be improved, and as a result, the cost required for vulcanization molding can be reduced.

  In addition, by dividing the injection hole of the first anti-vibration base and the injection hole of the second anti-vibration base in one direction along the axial direction of the first bush or the second bush, the mold is divided (divided) in the vulcanization mold. The direction can be made one direction along the axial direction of the first bush or the second bush without making the first bush and the second bush different. Thereby, the structure of the vulcanization mold can be simplified, and the cost of the vulcanization mold can be reduced. Further, since the structure of the vulcanization mold can be simplified, the molding work including mold assembly and mold disassembly can be simplified. As a result, the cost required for vulcanization molding of the vibration isolator can be reduced.

  According to the vibration isolator of claim 2, one of the first injection trace part or the second injection trace part is formed in the axial direction of the axial end face of the first vibration isolation base or the second prevention base, and the first injection trace part Alternatively, the other of the second injection trace portions is an outer peripheral surface in the outer peripheral direction in which the axial end surface of the first vibration isolation base or the second anti-vibration base is positioned axially outside the axial end surface of the first outer cylinder or the second outer cylinder. Is formed. Therefore, one axial direction of the 1st bush or the 2nd bush and the direction of the injection hole of the 1st anti-vibration base and the 2nd anti-vibration base can be made to correspond. Thereby, in addition to the effect of Claim 1, there exists an effect which can make one axial direction of a 1st bush or a 2nd bush into the parting (division | segmentation) direction of a vulcanization mold.

  The other of the first injection trace part and the second injection trace part is such that the axial end face of the first vibration isolation base or the second prevention base is positioned outside the axial end face of the first outer cylinder or the second outer cylinder. Since it is formed on the outer peripheral surface, it is difficult to cause cracks in the first injection trace portion or the second injection trace portion when the vibration-proof substrate is used.

  That is, the first vibration isolation base and the second vibration isolation base are members that are elastically deformed when the vibration isolation device is used, and in particular, the root portion of the first injection trace portion and the second injection trace portion is the use of the vibration isolation device. Sometimes stress concentration is likely to occur, and cracks are likely to occur due to this. However, since the stress acting on the outer peripheral surface of the first vibration isolating base and the second vibration isolating base located on the outer side in the axial direction from the axial end surface of the first outer cylinder or the second outer cylinder is small, By forming the first injection trace portion and the second injection trace portion, it is possible to make it difficult to cause a crack at the root of the first injection trace portion and the second injection trace portion. As a result, in addition to the effect of the first aspect, there is an effect that it is possible to prevent the first vibration-isolating base and the second vibration-isolating base from being cracked and reducing the durability.

  According to the vibration isolator of claim 3, the first outer cylinder or the second outer cylinder has a through-hole formed through the outer peripheral surface and the inner peripheral surface of the first outer cylinder or the second outer cylinder. In addition, one of the first injection trace portion and the second injection trace portion is formed in the axial direction of the axial end face of the first vibration isolation base or the second prevention base. The other of the first injection trace part and the second injection trace part is formed in an injection part composed of a rubber-like elastic material injected into the through hole. Therefore, one axial direction of the 1st bush or the 2nd bush and the direction of the injection hole of the 1st anti-vibration base and the 2nd anti-vibration base can be made to correspond. Thereby, in addition to the effect of Claim 1, there exists an effect which can make one axial direction of a 1st bush or a 2nd bush into the parting direction of a vulcanization mold.

  The other of the first injection trace part or the second injection trace part is formed in an injection part made of a rubber-like elastic material injected into a through hole formed through the first outer cylinder or the second outer cylinder. Therefore, the periphery of the root of the first injection trace portion or the second injection trace portion can be restrained by the inner peripheral surface (around the through hole) of the first outer cylinder or the second outer cylinder.

  Here, the first anti-vibration base and the second anti-vibration base are members that are elastically deformed when the anti-vibration device is used, and stress concentration tends to occur particularly at the roots of the first injection trace and the second injection trace. This is the place where cracks are likely to occur. As described above, since the periphery of the root of the first injection trace portion and the second injection trace portion where cracks are likely to occur is restrained around the through hole, the deformation amount of the root can be reduced, and the first injection trace portion and the second injection trace portion can be reduced. It is possible to prevent a crack from occurring in the injection trace portion. As a result, in addition to the effect of the first aspect, there is an effect capable of preventing the durability of the first vibration isolation base and the second vibration isolation base from being lowered.

  According to the vibration isolator of claim 4, the first vibration isolation base is provided with a straight portion that is positioned in a direction connecting the first bush and the second bush on the axial end face and is recessed in the axial direction. Therefore, the first vibration-proof base can be lowered in the direction connecting the first bush and the second bush. As a result, the vibration isolation performance of the vibration isolation device can be improved.

  On the other hand, a region overlapping the first inner cylinder in a direction orthogonal to the direction connecting the first bushing and the second bushing of the first vibration isolation base and in the direction perpendicular to the axis of the first bushing is relatively high spring. Can be By forming the first injection trace portion in this region, the amount of deformation of the root of the first injection trace portion can be suppressed, so that it is difficult for the root to crack. Thereby, in addition to the effect of any one of Claims 1 to 3, there is an effect that it is possible to prevent the durability of the first vibration isolating base from being lowered while improving the vibration isolating performance.

It is a top view of the vibration isolator in 1st Embodiment. It is sectional drawing of a vibration isolator and a vulcanization mold. FIG. 3 is a cross-sectional view of a vibration isolator and a vulcanization mold taken along line III-III in FIG. 2. It is sectional drawing of the vibration isolator and vulcanization die in the IV-IV line of FIG. It is a side view of the vibration isolator in 2nd Embodiment. It is sectional drawing of a vibration isolator and a vulcanization mold. It is sectional drawing of the vibration isolator and vulcanization mold in the VII-VII line of FIG. FIG. 7 is a cross-sectional view of a vibration isolator and a vulcanization mold taken along line VIII-VIII in FIG. 6. It is sectional drawing of the vibration isolator and vulcanization metal mold | die in the IX-IX line of FIG. It is a top view of the vibration isolator in 3rd Embodiment. It is sectional drawing of a vibration isolator and a vulcanization mold. It is a side view of the vibration isolator in 4th Embodiment. It is a top view of a vibration isolator.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a vibration isolator 1 according to the first embodiment of the present invention. In addition, the vibration isolator 1 has shown the torque rod for motor vehicles.

  As shown in FIG. 1, the vibration isolator 1 includes a first bush 10 attached to an unillustrated engine side (vibration generating side) and a second bush 20 attached to a vehicle body side (vibration receiving side) not shown. And a connecting member 30 for connecting the first bush 10 and the second bush 20 to each other. The first bush 10 and the second bush 20 are connected to each other so that the axial directions thereof are orthogonal to each other by a connecting member 30 and are configured to be able to regulate displacement in the roll direction of the engine and displacement in the front-rear direction during acceleration. Has been.

  The first bush 10 includes a first inner cylinder 11 attached to the engine side, a first outer cylinder 12 positioned on the outer peripheral side of the first inner cylinder 11, and the first inner cylinder 11 and the first outer cylinder. 12 and a first anti-vibration base 13 made of a rubber-like elastic material.

  The first inner cylinder 11 is a member made of a metal material into a cylindrical shape, and a fastening member (not shown) such as a bolt is inserted into an insertion hole 11a drilled in the center, and the engine is connected to the engine through the fastening member. Fastened to the side. The first outer cylinder 12 is formed of a metal material in a cylindrical shape, is integrally connected to the connecting member 30, and is positioned on the outer peripheral side of the first inner cylinder 11 with a predetermined interval.

  The first vibration isolation base 13 is a member made of a rubber-like elastic material. The first inner cylinder 11 and the first outer cylinder 12 are integrally vulcanized and bonded, and the first inner cylinder 11 and the first outer cylinder 12 are connected over the entire circumference. The first vibration isolation base 13 is formed with a straight portion 13a that penetrates the first vibration isolation base 13 in the axial direction (perpendicular to the plane of FIG. 1) at diagonal positions sandwiching the first inner cylinder 11.

  When the first vibration isolation substrate 13 is vulcanized, the first injection trace portion 14 is formed by an injection hole 62 (see FIG. 3) and a relief hole 64 formed in a vulcanization mold (upper mold 60) described later. This is a portion to be formed, and is formed in the axial direction of one axial end face of the first vibration isolating base 13 (before the vertical direction in FIG. 1). Further, the first injection trace 14 is in a direction (vertical direction in FIG. 1) perpendicular to the direction connecting the first bush 10 and the second bush 20 (horizontal direction in FIG. 1) and in the direction perpendicular to the axis of the first bush 10. One projection p is formed in each region p overlapping the first inner cylinder 11 with the first inner cylinder 11 in between.

  The second bush 20 includes a second inner cylinder 21 attached to the vehicle body side, a second outer cylinder 22 positioned on the outer peripheral side of the second inner cylinder 21, and the second inner cylinder 21 and the second outer cylinder. And a second vibration isolating base 23 made of a rubber-like elastic material.

  The second inner cylinder 21 is a member formed in a cylindrical shape from a metal material, and a fastening member (not shown) such as a bolt is inserted through an insertion hole drilled in the center, and the vehicle body side through the fastening member. Fastened and fixed to. The second outer cylinder 22 is formed of a metal material in a cylindrical shape and is continuously provided integrally with the connecting member 30, and is positioned on the outer peripheral side of the second inner cylinder 21 with a predetermined interval. The second outer cylinder 22 is formed such that its axial length (vertical direction in FIG. 1) is shorter than the axial length of the second inner cylinder 21, and its inner diameter (left and right direction in FIG. 1) is smaller than the inner diameter of the first outer cylinder 12. Is formed.

  The second vibration isolating base 23 is a member made of a rubber-like elastic material. The second inner cylinder 21 and the second outer cylinder 22 are integrally vulcanized and bonded to connect the second inner cylinder 21 and the second outer cylinder 22 over the entire circumference. The second anti-vibration base 23 is formed such that the entire axial length (vertical direction in FIG. 1) is longer than the axial length of the second outer cylinder 22, and the axial end face is longer than the axial end face of the second outer cylinder 22. It protrudes and is located outside in the axial direction (upper side and lower side in FIG. 1).

  The second injection trace portion 24 is formed by an injection hole 66 (see FIG. 4) and an escape hole 68 formed in a vulcanization mold (upper mold 60) described later when the second vibration-proof base 23 is vulcanized. The outer peripheral surface of the axial end surface of the second vibration isolating base 23 that is a portion to be formed and protrudes outward in the axial direction (upper side and lower side in FIG. 1) from the axial end surface of the second outer cylinder 22 (FIG. 1 paper surface) It is formed in the vertical direction). In the present embodiment, the second injection trace 24 is formed at one location on the outer peripheral surface of the axial end surface of the second vibration isolation base 23 with the second outer cylinder 22 interposed therebetween. Specifically, the second injection trace portion 24 is formed in a protruding portion 23 a that protrudes in the outer peripheral direction of the outer peripheral surface of the axial end surface of the second vibration isolation base 23.

  The connecting member 30 is a member for connecting the first bush 10 and the second bush 20 and is made of a metal material in a rod shape. The connecting member 30 includes the first outer cylinder 12 and the second outer cylinder such that the axial direction of the first bush 10 (the vertical direction in FIG. 1) and the axial direction of the second bush 20 (the vertical direction in FIG. 1) are orthogonal to each other. 22 is integrally provided. Thus, even if the axial direction of the first bush 10 (the vertical direction in FIG. 1) and the axial direction of the second bush 20 (the vertical direction in FIG. 1) are orthogonal to each other, the first injection of the vibration isolator 1 is performed. The trace part 14 and the second injection trace part 24 are arranged at positions that can be seen from one direction along the axial direction of the first bush 10 (the vertical direction in FIG. 1).

  Next, the vulcanization mold (the lower mold 50, the upper mold 60, and the runner plate 70) in which the vibration isolator 1 is manufactured will be described with reference to FIGS. 2 to 4 show that the lower mold 50 and the upper mold 60 of the vulcanization mold are closed, and the first inner cylinder 11, the second inner cylinder 21, the first outer cylinder 12, and the second outer cylinder. A state in which a rubber-like elastic material is filled in a cavity formed by setting a connecting member 30 connecting 22 is illustrated. FIG. 2 is a cross-sectional view of the vibration isolator 1 and the vulcanization mold (lower mold 50 and upper mold 60). The first inner cylinder 11 is set such that the axial length (vertical direction in FIG. 2) is larger than the axial length of the second outer cylinder 12.

  As shown in FIG. 2, the lower mold 50 is a member configured to be capable of closing and opening the mold by moving up and down (up and down in FIG. 2) with respect to the upper mold 60. On the upper surface of the lower mold 50, fitting holes 50a, 50c, 50d, in which the first inner cylinder 11, the first outer cylinder 12, the connecting member 30, the second inner cylinder 21, and the second outer cylinder 22 are fitted and held. 50e and fitting step 50g (see FIG. 4), molding surfaces 50b and 50f (see FIG. 4) constituting a part of the cavity in which the first vibration isolation base 13 and the second vibration isolation base 23 are molded are recessed. Has been.

  The fitting hole 50a is a part where the axial end of the first inner cylinder 11 is fitted and held, and a support pin 51 is provided projecting from the center. The support pin 51 is a member that fits into the insertion hole 11 a of the first inner cylinder 11 and locks the first inner cylinder 11. The molding surface 50b constitutes a part of the cavity and is a curved surface for molding the axial end surface (lower side in FIG. 2) of the first vibration isolation base 13.

  The molding surface 50b rises and slopes in the axial direction from the fitting hole 50a along the direction connecting the first bush 10 (see FIG. 1) and the second bush 20 (left and right direction in FIG. 2), and in the axial direction. It is connected to the fitting hole 50c while entering. The fitting holes 50c, 50d, and 50e are fitted and held on the axial end of the first outer cylinder 12, the connecting member 30, and the outer peripheral surface of the second outer cylinder 22 (part of the axial end). It is a part.

  The upper mold 60 is a member configured to be mold-closeable and mold-openable with respect to the lower mold 50, and is disposed to face the upper side of the lower mold 50. With the lower mold 50 and the upper mold 60 closed, the first inner cylinder 11, the first outer cylinder 12, the connecting member 30, the second inner cylinder 21 and the second outer cylinder 22 are pressed and clamped portions 60a, 60c, 60d, 60e, 60g (see FIG. 4), molding surfaces 60b, 60f (see FIG. 4) constituting part of the cavity in which the first vibration isolation base 13 and the second vibration isolation base 23 are molded are Recessed on the lower surface of the mold 60.

  The fitted portion 60 a is a portion that presses and clamps the axial end portion of the first inner cylinder 11, and an inner cylinder presser 61 that is concentrically opposed to the support pin 51 is protruded from the center. The inner cylinder retainer 61 is a member that fits into the insertion hole 11 a of the first inner cylinder 11 and locks the first inner cylinder 11. The molding surface 60b is a curved surface that forms a part of the cavity and molds the axial end surface (upper side in FIG. 2) of the first vibration isolation base 13.

  The molding surface 60b is inclined downward from the fitted portion 60a toward the outer circumferential direction along the direction connecting the first bush 10 and the second bush 20 (left and right direction in FIG. 2), and the fitted portion while entering the axial direction. 60c is provided continuously. The fitted portions 60c, 60d, 60e, and 60g (see FIG. 4) are the axial end portion of the first outer cylinder 11, the connecting member 30, and the outer peripheral surface of the second outer cylinder 22 (part of the axial end portion). Each is a part to be pressed and clamped.

  As shown in FIG. 2, the axial interval (vertical direction in FIG. 2) between the molding surfaces 50 b and 60 b formed on the lower mold 50 and the upper mold 60, respectively, approaches the first outer cylinder 12. It is shorter than the axial length. Thereby, the axial direction (FIG. 2) from the axial direction end surface of the 1st anti-vibration base | substrate 13 in the site | part located in the direction (FIG. 2 left-right direction) which connects the 1st bush 10 and the 2nd bush 20 of the 1st anti-vibration base | substrate 13. A straight portion 13b that is recessed in the vertical direction is formed.

  Further, a straight portion 13 a (see FIG. 1) penetrating the axial end surface of the first vibration isolating base 13 is formed by a nested die (not shown) that is fitted and fixed to the lower die 50 and the upper die 60. The first bushing 10 and the second bushing of the first anti-vibration base 13 are formed by forming the straight portions 13a and 13b in the portion located in the direction connecting the first bushing 10 and the second bushing 20 of the first anti-vibration base 13. The direction in which 20 is connected can be lowered. As a result, the anti-vibration performance for suppressing the vibration in the longitudinal direction of the connecting member 30 input to the anti-vibration device 1 can be improved.

  Next, the first vibration isolation base 13 will be described with reference to FIG. 3 is a cross-sectional view of the vibration isolator 1 and the vulcanizing mold (lower mold 50, upper mold 60, and runner plate 70) taken along line III-III in FIG. The runner plate 70 is a member mounted on the upper surface of the upper mold 60 and is configured to be separable from the upper mold 60 when the lower mold 50 and the upper mold 60 are opened. The runner plate 70 has a runner groove 71 for injection of a molding material such as a rubber-like elastic material and an air and a release groove 72 for the molding material formed on the lower surface. When the lower mold 50 and the upper mold 60 are closed, the injection runner groove 71 is connected to an injection port of a molding material injection device (not shown) and one end is formed in the upper mold 60. It communicates with the injection hole 62. When the lower mold 50 and the upper mold 60 are closed, the escape groove 72 has one end communicating with the escape hole 64 formed in the upper mold 60 and the other end on the side surface of the vulcanization mold (upper mold 60). It is open.

  The injection hole 62 is a flow path through which a molding material is injected, and is formed through the upper mold 60 in the vertical direction from the upper surface of the upper mold 60 to the molding surface 60b. The injection hole 62 is formed in a tapered shape with a diameter decreasing toward the lower surface of the upper mold 60, and a constricted gate 63 is formed in the vicinity of the molding surface 60b. At the time of die-cutting after molding, the molded first anti-vibration base 13 and the unnecessary portion of the molding material are separated by the gate 63 to form the first injection trace portion 14 (see FIG. 1).

  The escape hole 64 is a flow path through which air and excess molding material flow out, and is formed through the upper mold 60 in the vertical direction from the upper surface of the upper mold 60 to the molding surface 60b. The relief hole 64 is formed in a taper shape with a diameter decreasing toward the lower surface of the upper mold 60, and a constricted gate 65 is formed in the vicinity of the molding surface 60b. At the time of die-cutting after molding, the molded first anti-vibration base 13 and the unnecessary portion of the molding material are separated by the gate 65, and the first injection trace portion 14 (see FIG. 1) is formed.

  The injection hole 62 and the escape hole 64 are positioned approximately 180 ° across the axis of the cavity (the first inner cylinder 11), and the direction connecting the first bush 10 and the second bush 20 (vertical in FIG. 3). Is formed in a direction orthogonal to (direction). Further, the axial interval (vertical direction in FIG. 3) between the molding surface 50b and the molding surface 60b constituting the cavity communicating with the injection hole 62 and the escape hole 64 is relative to the direction connecting the first bush 10 and the second bush 20. Along the direction (right and left direction in FIG. 3) perpendicular to each other, it gradually increases toward the axial center (first inner cylinder 11). Thereby, the first inner side is projected in a direction perpendicular to the direction connecting the first bushing 10 and the second bushing 20 of the first vibration isolation base 13 (left and right direction in FIG. 3) and in the direction perpendicular to the axis of the first bushing 10. The region p (see FIG. 1) overlapping the cylinder 11 can be made highly springy. By forming the first injection trace portion 14 in this region p, the amount of deformation of the root of the first injection trace portion 14 when the vibration isolator 1 is used can be suppressed.

  Here, if the first injection trace portion 14 remains in an upright state on the first vibration isolation substrate 13, the first injection trace portion 14 behaves like a foreign substance existing on the surface of the first vibration isolation substrate 13, Stress concentration occurs at the root of the first injection trace 14. Due to this, a crack is generated at the root, and when the crack progresses, there is a possibility that the durability of the vibration isolator 1 is lowered.

  On the other hand, the region p (see FIG. 1) has a relatively high spring compared to the direction connecting the first bush 10 and the second bush 20 of the first vibration isolation base 13, and the first injection trace portion is formed in this region p. By forming 14, it is possible to make it difficult to cause a crack at the root of the first implantation trace portion 14. Thereby, it can prevent that durability of the vibration isolator 1 falls.

  Next, the second vibration isolation base 23 will be described with reference to FIG. 4 is a cross-sectional view of the vibration isolator 1 and the vulcanizing mold (lower mold 50, upper mold 60, and runner plate 70) taken along line IV-IV in FIG. The fitting hole portion 50e is a portion where both axial end portions of the second outer cylinder 21 are fitted and held, and is formed on the upper surface of the lower mold 50 and connected to the molding surface 50f. The molding surface 50f is a surface for molding the end surface in the axial direction of the second vibration isolating base 23, and the axial length of the entire cavity (the left-right direction in FIG. 4) is fitted into which the second outer cylinder 22 is fitted. It is formed to be longer than the axial length of the hole 50e. The fitting step portion 50g is a portion where both axial end portions of the second inner cylinder 21 are fitted and held, and is formed with a step so as to protrude outward in the axial direction from the molding surface 50f extending in the vertical direction. 50f is continuously provided.

  The fitted portion 60 e is a portion that presses and holds the outer peripheral surface of the second outer cylinder 21, and is formed on the lower surface of the upper mold 60. The molding surfaces 60f are continuously provided on both sides in the axial direction of the fitted portion 60e. The molding surface 60f is a surface for forming a cavity that forms the axial end surface of the second vibration isolation base 23, and the axial length of the entire cavity (left and right direction in FIG. 4) is the same as that of the second outer cylinder 22. It is formed so as to be longer than the axial length of the fitted portion 60e. Recessed portions 60f1 and 60f2 are provided at the upper end of the molding surface 60f so as to be provided on both axial sides of the upper end of the fitted portion 60e. The fitted portion 60g is a portion that presses and clamps both end portions in the axial direction of the second inner cylinder 21, and is connected to the molding surface 60f with a step so as to protrude outward in the axial direction.

  The injection hole 66 has an upper end communicating with the injection runner groove 73, penetrating the upper mold 60 in the vertical direction, and a lower end communicating with the recessed portion 60 f 1 via the gate 67. The escape hole 68 has an upper end communicating with the escape runner groove 74, penetrating the upper mold 60 in the vertical direction, and a lower end communicating with the recessed portion 60 f 2 via the gate 69. The molding material is injected from the injection hole 66 and filled into the cavity, and the surplus flows out from the escape hole 68. At the time of die cutting after molding, the molded second vibration isolating base 23 and the unnecessary portion of the molding material are separated by the gates 67 and 69, and the second injection trace portion 24 is formed.

  Here, the injection hole 66 and the escape hole 68 are formed at positions that are substantially 180 ° across the second outer cylinder 22, and the gates 67 and 69 are axially outer sides of the axial end surfaces of the second outer cylinder 22. Is formed. As a result, the second injection trace portion 24 can be formed on the outer peripheral surface of the second vibration isolation base 23 protruding outward in the axial direction from the axial end surface of the second outer cylinder 22. If the second injection trace portion 24 remains in a protruding shape on the second vibration isolation base 23, stress concentration easily occurs at the root portion due to the elastic deformation of the second vibration isolation base 23, and cracks are likely to occur due to this. .

  However, since the stress acting on the outer peripheral surface of the second vibration isolation base 23 located on the axially outer side from the axial end surface of the second outer cylinder 22 is small, by forming the second injection trace portion 24 on the outer peripheral surface, It is possible to make it difficult to generate a crack at the root of the second injection trace portion 24. As a result, it is possible to prevent the second vibration-proof substrate 23 from cracking and lowering the durability.

  The upper mold 60 is provided with recessed portions 60f1 and 60f2 that are recessed at the upper end of the molding surface 60f and that are continuously provided on both sides in the axial direction of the fitted portion 60e, and gates 67 and 69 are provided in the recessed portions 60f1 and 60f2. Are communicating. By filling the concave portions 60f1 and 60f2 with the molding material, a protruding portion 23a (see FIG. 5) that protrudes from the outer peripheral surface of the second vibration-isolating base 23 that protrudes axially outward from the axial end surface of the first outer cylinder 22 1), and the second injection trace portion 24 is formed on the protruding portion 23a. Since the stress acting on the outer peripheral surface of the second vibration isolating base 23 on which the protruding portion 23a is formed is small, and the protruding portion 23a can have a smaller curvature than the curvature of the second injection trace portion 24, the protruding portion The stress concentration of 23a is relaxed. As a result, stress concentration in the second implantation trace portion 24 can also be suppressed. In this manner, by forming the second injection trace portion 24 in the protruding portion 23a, it is possible to further prevent a crack from occurring at the root of the second injection trace portion 24.

  Next, a method for manufacturing the vibration isolator 1 using the vulcanization molds (the lower mold 50, the upper mold 60, and the runner plate 70) described above will be described. A mold in which the upper mold 50 and the lower mold 60 are separated from each other after the adhesive is applied to the outer circumferential surfaces of the first inner cylinder 11 and the second inner cylinder 21 and the inner circumferential surfaces of the first outer cylinder 12 and the second outer cylinder 22. In the opened state, the second inner cylinder 21 is fitted to the fitting step 50g while the second outer cylinder 22 is fitted to the fitting hole 50e (see FIG. 4) of the lower mold 50, and the fitting hole 50c. , 50d (see FIG. 2), the first outer cylinder 12 and the connecting member 30 are fitted. Further, the first inner cylinder 11 is fitted to the support pin 51. Next, the lower mold 50 is moved up and down (up and down in FIG. 2) with respect to the upper mold 60 to close the lower mold 50 and the upper mold 60 together. As a result, the first inner cylinder 11, the first outer cylinder 12, the connecting member 30, the second inner cylinder 21, and the second outer cylinder 22 are pressed by the fitted portions 60a, 60c, 60d, 60e, and 60g of the upper mold 60. Is done. As a result, a cavity surrounded by the lower mold 50 and the upper mold 60 and the first outer cylinder 12 and the second outer cylinder 22 is formed around the first inner cylinder 11 and the second inner cylinder 12.

  After the runner plate 70 is closed, a predetermined amount of molding material is injected at a predetermined pressure through injection runner grooves 71 and 73 and injection holes 62 and 66 from an injection device (not shown). The injected molding material is filled between the first inner cylinder 11 and the first outer cylinder 12, the second inner cylinder 21 and the second outer cylinder 22. As the molding material flows and fills, air is discharged from the escape holes 64 and 68. Excess molding material overflows from the escape holes 64 and 68.

  After the molding material is filled in the cavity, the molding material (rubber-like elastic material) undergoes a vulcanization reaction by holding the molding material in a pressurized and heated state for a certain period of time, and simultaneously the first inner cylinder 11 and the first outer cylinder. 12, vulcanized and bonded integrally to the second inner cylinder 21 and the second outer cylinder 22; As a result, the first anti-vibration base 13 and the second anti-vibration base 23 are formed.

  After molding, the lower mold 50 and the upper mold 60 are opened, and the runner plate 70 is separated from the upper surface of the upper mold 60. At that time, the molding material is separated at the locations of the gates 63, 65, 67 and 69. At this time, the first injection trace portion 14 and the second injection trace portion 24 are formed. By pushing up the support pins 51 of the lower mold 50 upward, the vibration isolator 1 on which the first vibration isolator base 13 and the second vibration isolator base 23 are molded can be detached from the lower mold 50, and the vibration isolator 1 Can be taken out from the vulcanization mold (lower mold 50, upper mold 60 and runner plate 70).

  As described above, the injection hole 62 and the escape hole 64 of the first vibration isolation base 13 and the injection hole 66 and the escape hole 68 of the second vibration isolation base 23 are provided in one direction along the axial direction of the first bush 10. Thereby, the 1st injection trace part 14 and the 2nd injection trace part 24 of the vibration isolator 1 are arrange | positioned in the position which can be visually recognized from one direction along the axial direction of the 1st bush 10. As shown in FIG. As a result, the routing of the injection holes 62 and 66 of the upper mold 60 and the escape holes 64 and 68 and the structure of the gates 63, 65, 67, and 69 can be simplified. Thereby, the rubber-like elastic material injected into the vulcanization mold can be hardly clogged with the gates 63, 65, 67 and 69. Thereby, the lifetime of the vulcanization mold (upper mold 60) can be improved. As a result, the cost required for vulcanization molding can be reduced.

  Further, the injection hole 62 and the escape hole 64 of the first vibration isolation base 13 and the injection hole 66 and the escape hole 68 of the second vibration isolation base 23 are positioned in one direction along the axial direction of the first bushing 10, thereby adding pressure. The direction of dividing (dividing) in the metal mold (the lower mold 50 and the upper mold 60) does not differ between the first bush 10 and the second bush 20, and in one direction along the axial direction of the first bush 10. can do.

  In particular, in the vibration isolator 1, the first injection trace portion 14 is formed in the axial direction of the axial end surface of the first vibration isolation base 13, and the second injection trace portion 24 is configured such that the axial end surface of the second prevention base 23 is the second outer cylinder. 22 is formed on the outer peripheral surface located on the axially outer side from the axial end surface. Thereby, the dividing (dividing) direction of the vulcanizing mold can be made to coincide with the axial direction of the first bush 10. As a result, the structure of the vulcanization mold can be simplified, and the cost of the vulcanization mold can be reduced. Further, since the structure of the vulcanization mold can be simplified, the molding work including mold assembly and mold disassembly can be simplified. Thereby, the cost required for the vulcanization molding of the vibration isolator 1 can be reduced. Furthermore, since the structure of the vulcanization mold (the lower mold 50 and the upper mold) can be simplified, the number of vibration isolator 1 per vulcanization mold can be increased, and the vibration isolator 1 can be manufactured. Cost can be reduced.

  Next, a second embodiment will be described. In the first embodiment, the first injection trace portion 14 is formed in the axial direction of the axial end surface of the first vibration isolation base 13, and the second injection trace portion 24 is formed in the outer peripheral direction of the outer peripheral surface of the second vibration isolation base 23. Explained the case. On the other hand, in the second embodiment, the first injection trace portion 114 is formed in the outer peripheral direction of the axial end surface of the first vibration isolation base 113, and the second in the axial direction of the axial end surface of the second vibration isolation base 123. The case where the injection trace part 124 is formed will be described. In addition, the same part as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 5 is a side view of the vibration isolator 101 according to the second embodiment.

  As shown in FIG. 5, the vibration isolator 101 includes a first bush 110 attached to an engine side (vibration generating side) (not shown) and a second bush 120 attached to a vehicle body side (vibration receiving side) (not shown). And a connecting member 30 for connecting the first bush 110 and the second bush 120 to each other. The first bush 110 and the second bush 120 are connected by the connecting member 30 so that the axial directions thereof are orthogonal to each other, and the displacement in the roll direction of the engine and the displacement in the front-rear direction during acceleration can be regulated. Has been.

  The first bush 110 includes a first inner cylinder 11 attached to the engine side, a first outer cylinder 12 positioned on the outer peripheral side of the first inner cylinder 11, and the first inner cylinder 11 and the first outer cylinder. 12 and a first anti-vibration base 113 made of a rubber-like elastic material.

  The first vibration isolation base 113 is a member made of a rubber-like elastic material. The first inner cylinder 11 and the first outer cylinder 12 are integrally vulcanized and bonded, and the first inner cylinder 11 and the first outer cylinder 12 are connected over the entire circumference. In the first vibration isolation base 113, a straight portion 113 b that extends from the axial end surface of the first vibration isolation base 13 in the axial direction (vertical direction in FIG. 1) is provided at a position sandwiching the first inner cylinder 11.

  The protruding portion 113 c is a portion protruding in the outer peripheral direction of the axial end surface of the first vibration isolation base 113 protruding outward in the axial direction from the axial end surface of the first outer cylinder 12. The projecting portion 113c is projected in a direction (vertical direction in FIG. 5) perpendicular to the direction connecting the first bush 110 and the second bush 120 (left and right direction in FIG. 5) and in the direction perpendicular to the axis of the first bush 110. It protrudes in a region overlapping the first inner cylinder 11 and is arranged in parallel with the first outer cylinder 12 sandwiched on the axially outer side from the axial end surface of the first outer cylinder 12.

  The first injection trace portion 114 is formed by an injection hole 162 (see FIG. 7) and an escape hole 164 formed in a vulcanization mold (upper mold 160) described later when the first vibration isolation base 113 is vulcanized. In this embodiment, it is formed on the protruding portion 113c.

  The second bush 120 includes a second inner cylinder 21 attached to the vehicle body side, a second outer cylinder 22 positioned on the outer peripheral side of the second inner cylinder 21, and the second inner cylinder 21 and the second outer cylinder. 22 and a second vibration isolation base 123 made of a rubber-like elastic material. The second vibration isolation base 123 is a member made of a rubber-like elastic material. The second inner cylinder 21 and the second outer cylinder 22 are integrally vulcanized and bonded to connect the second inner cylinder 21 and the second outer cylinder 22 over the entire circumference.

  The second injection trace portion 124 is formed by an injection hole 166 (see FIG. 9) and an escape hole 168 formed in a vulcanization mold (upper mold 60) described later when the second vibration-proof base 123 is vulcanized. And is formed in the axial direction (vertical direction in FIG. 5) of the axial end surface of the second vibration-proof base 123. The axial direction of the first bush 110 (up and down direction in FIG. 5) and the axial direction of the second bush 120 (perpendicular direction in FIG. 5) are orthogonal to each other. The 2 injection trace part 124 is arrange | positioned in the position which can be visually recognized from one direction along the axial direction (FIG. 1 paper surface perpendicular | vertical direction) of the 2nd bush 120. As shown in FIG.

  Next, with reference to FIGS. 6 to 9, the vulcanization mold (the lower mold 150, the upper mold 160, the runner plate 170, and the middle molds 181 and 182) in which the vibration isolator 101 is manufactured will be described. 6 to 9, the lower mold 150 and the upper mold 160 of the vulcanization mold are closed, and the first inner cylinder 11, the second inner cylinder 21, the first outer cylinder 12, and the second outer cylinder. A state in which a rubber-like elastic material is filled in a cavity formed by setting a connecting member 30 connecting 22 is illustrated. FIG. 6 is a cross-sectional view of the vibration isolator 101 and the vulcanization mold (the lower mold 150, the upper mold 160, and the middle molds 181 and 182).

  As shown in FIG. 6, the lower mold 150 is a member configured to be capable of closing and opening the mold by moving up and down (up and down in FIG. 6) with respect to the upper mold 160. On the upper surface of the lower mold 150, fitting holes 150a, 150d, 150e, in which the first inner cylinder 11, the first outer cylinder 12, the connecting member 30, the second inner cylinder 21, and the second outer cylinder 22 are fitted and held. 150g and the fitting step part 150c (refer FIG. 7) are recessedly provided. Further, molding surfaces 150b (see FIG. 7) and 150f constituting a cavity in which the first vibration isolation base 113 and the second vibration isolation base 123 are molded are recessed in the upper surface of the lower mold 150.

  The upper mold 160 is a member configured to be mold-closeable and mold-openable with respect to the lower mold 150, and is disposed to face the lower mold 150. With the lower mold 150 and the upper mold 160 closed, the first inner cylinder 11, the first outer cylinder 12, the connecting member 30, the second inner cylinder 21, and the second outer cylinder 22 that are fitted and held in the lower mold 150. Is pressed and clamped. The fitted parts 160a and 160d of the upper mold 160 press and hold the first outer cylinder 12 and the connecting member 30 fitted and held in the fitting holes 150a and 150d of the lower mold 50, and the fitted part 160e The second inner cylinder 21 fitted and held in the fitting hole 150e of the mold 150 is pressed and clamped. The fitted portion 160g presses and holds the second outer cylinder 22 fitted and held in the fitting hole 150g.

  The middle molds 181 and 182 are members for forming a straight portion 113a that penetrates in the axial direction of the first vibration isolation base 113, and are orthogonal to the dividing direction (the vertical direction in FIG. 6) of the lower mold 150 and the upper mold 160. It is configured as a slide type that slides in a direction (perpendicular to FIG. 6).

  The molding surfaces 150f and 160f are surfaces for molding the end surface in the axial direction of the second vibration isolation base 123, and are continuous with the fitting hole portions 150e and 150g and the fitted portions 160e and 160g, respectively. The molding surfaces 150f and 160f for molding the second vibration-isolating base 123 have an axial length (vertical direction in FIG. 6) of the entire cavity, and a fitting hole portion 150g and a fitting portion 160g in which the second outer cylinder 22 is pressed and clamped. It is formed so that it may become longer than the axial interval. A support pin 151 that locks the second inner cylinder 21 protrudes from the center of the fitting hole 150e, and an inner cylinder presser 161 protrudes from the fitted part 160e so as to face the support pin 151.

  Next, the first vibration isolation base 113 will be described with reference to FIG. 7 is a cross-sectional view of the vibration isolator 101 and the vulcanizing mold (the lower mold 150, the upper mold 160, the middle molds 181, 182 and the runner plate 170) taken along the line VII-VII in FIG. The fitting hole 150a is a portion where the axial end surface of the first outer cylinder 12 is fitted and held, and is formed on the upper surface of the lower mold 150 and is continuous with the molding surface 150b.

  The molding surface 150b is a curved surface for molding the end surface in the axial direction of the first vibration isolation base 113. The molding surface 150b is formed in the lower mold 150 in the axial direction of the first inner cylinder 11 and the first outer cylinder 12 (left and right direction in FIG. 7). Is formed at the tip of the middle mold 181 that slides on the fitting hole 150c. Since the molding surface 150b is formed as a curved surface that protrudes inward in the axial direction from the axial end surface of the first outer cylinder, the straight portion 113b is recessed in the axial end surface of the first vibration isolation base 113. The fitting hole 150 c is a portion for fitting and holding the axial end surface of the first inner cylinder 11, and is formed in the lower mold 150 and the middle mold 181.

  The fitted portion 160a is a portion where the axial end surface of the first outer cylinder 12 is fitted and held, and the middle mold 182 that slides in the axial direction (left and right direction in FIG. 7) of the first inner cylinder 11 and the first outer cylinder 12. Formed continuously with the molding surface 160b. The molding surface 160b is a surface for molding the axial end surface of the first vibration isolation base 113 and forming a straight portion 113b that is recessed in the axial direction of the axial end surface. The molding surface 160b is formed as a curved surface that protrudes inward in the axial direction from the axial end surface of the first outer cylinder 12, and is continuous with the fitted portion 160c. The fitted part 160 c is a part for fitting and holding the axial end surface of the first inner cylinder 11, and is formed in the middle mold 182 and the upper mold 160.

  The upper end of the injection hole 162 communicates with the runner groove 171 for injection, and the lower end communicates with the recessed portion 160b1 recessed through the molding surface 160b via the gate 163 while penetrating the middle mold 182 in the vertical direction. The escape hole 164 has an upper end communicating with the escape runner groove 172, passing through the middle mold 182 in the vertical direction, and a lower end communicating with the recess 160 b 2 via the gate 165. The recessed portions 160b1 and 160b2 are portions for forming the protruding portions 113c (see FIG. 5) in the first vibration isolation base 113. The molding material is injected from the injection hole 162 and filled into the cavity, and the surplus flows out from the escape hole 164. At the time of die-cutting after molding, the molded first anti-vibration base 113 and the unnecessary portion of the molding material are separated by the gates 163 and 165, and the first injection trace portion 113 is formed.

  The injection hole 162 and the escape hole 164 are formed at positions that are substantially 180 ° opposite to each other with the first outer cylinder 12 interposed therebetween, and the gates 163 and 165 are formed in the vicinity of the axial end surface of the first inner cylinder 11. It is formed on the recessed portions 160b1 and 160b2. Thereby, the 1st injection | pouring trace part 114 (refer FIG. 5) is formed in the protrusion part 113c which protruded in the outer peripheral surface of the 1st anti-vibration base | substrate 113 which exists in the axial direction outer side from the axial direction end surface of the 1st outer cylinder 12. be able to.

  Here, if the first injection trace 114 remains on the first vibration isolation base 113 in a protruding shape, stress concentration easily occurs at the base portion due to the elastic deformation of the first vibration isolation base 113, and cracks are caused thereby. It is easy to generate. The stress concentration is more likely to occur as the curvature of the protrusion increases. However, since the first injection trace portion 114 is formed on the protruding portion 113c having a curvature smaller than the curvature of the root of the first injection trace portion 114, stress concentration generated at the root of the protruding portion 113c can be reduced. As a result, stress concentration occurring at the root of the first injection hole 114 can be suppressed. As a result, it is possible to make it difficult for a crack to occur at the root portion of the first injection trace portion 114, and it is possible to prevent the durability from being deteriorated due to a crack in the first vibration isolation base 113.

  Moreover, the 1st injection | pouring trace part 114 is formed in the axial direction end surface vicinity of the 1st inner cylinder 11 of the 1st anti-vibration base | substrate 113 located inside the straight part 113b. In this portion, the deformation of the first vibration isolation base 113 is restricted to some extent by the first inner cylinder 11. Therefore, by forming the first injection trace portion 114 at this portion, it is possible to make it difficult to cause a crack at the root of the first injection trace portion 114.

  Next, with reference to FIG. 8, a description will be given of the straight portion 113 a formed through the axial end surface of the first vibration isolation base 113 in the axial direction. 8 is a cross-sectional view of the vibration isolator 101 and the vulcanization mold (the lower mold 150, the upper mold 160, and the runner plate 170) taken along the line VIII-VIII in FIG. The middle molds 181 and 182 are configured as slide molds that are slidable in the axial direction (left-right direction in FIG. 8) of the first inner cylinder 11 and the first outer cylinder 12 sandwiched between the fitting hole 150a and the fitted part 160a. At the same time, it is inserted between the first inner cylinder 11 and the first outer cylinder 12 and is in contact with each other in the axial direction. As a result, a straight portion 113 a that is formed through the axial end surface of the first vibration isolation base 113 is formed. By forming the straight portion 113a, the first anti-vibration base 113 has a partially reduced spring constant in the direction perpendicular to the axis.

  Next, the second vibration isolation base 123 will be described with reference to FIG. 9 is a cross-sectional view of the vibration isolator 101 and the vulcanization mold (the lower mold 150, the upper mold 160, and the runner plate 170) taken along line IX-IX in FIG. The injection hole 166 has an upper end communicating with the injection runner groove 173, passing through the upper mold 160 in the vertical direction, and having a lower end opened to the molding surface 160 f via the gate 167 and communicated with the cavity. The escape hole 168 has an upper end communicating with the escape runner groove 174, passing through the upper mold 160 in the vertical direction, and having a lower end opened to the molding surface 160 f via the gate 169 and communicated with the cavity. The molding material is injected from the injection hole 166 and filled into the cavity, and the surplus flows out from the escape hole 168. At the time of die-cutting after molding, the molded second anti-vibration base 123 and the unnecessary portion of the molding material are separated by the gates 167 and 169 to form the second injection trace portion 124 (see FIG. 5). The injection hole 166 and the escape hole 168 are formed at positions that are substantially 180 ° opposite to each other with the second inner cylinder 21 interposed therebetween.

  Next, a manufacturing method of the vibration isolator 101 using the vulcanization molds (the lower mold 50, the upper mold 60, the runner plate 70, and the middle molds 181 and 182) described above will be described. A mold in which the upper mold 150 and the lower mold 160 are separated after the adhesive is applied to the outer circumferential surfaces of the first inner cylinder 11 and the second inner cylinder 21 and the inner circumferential surfaces of the first outer cylinder 12 and the second outer cylinder 22. In the open state, the second outer cylinder 22 and the connecting member 30 are fitted into the fitting holes 150e and 150d (see FIG. 6), and the second inner cylinder 21 is fitted to the support pin 151. Further, the first outer cylinder 12 is fitted into the fitting hole 150a (see FIG. 7), and the first inner cylinder 11 is fitted into the fitting step 150c while sliding the middle die 181. Next, the lower mold 150 is moved up and down (up and down in FIG. 6) with respect to the upper mold 160 to close the lower mold 150 and the upper mold 160 together. Further, the middle mold 182 is slid to sandwich the first inner cylinder 11 and the first outer cylinder 12. Thereby, a cavity surrounded by the first outer cylinder 12 and the second outer cylinder 22 is formed around the first inner cylinder 11 and the second inner cylinder 12.

  After the runner plate 170 is closed, a predetermined amount of molding material is injected at a predetermined pressure through injection runner grooves 171 and 173 and injection holes 162 and 166 from an injection device (not shown). The injected molding material is filled between the first inner cylinder 11 and the first outer cylinder 12, the second inner cylinder 21 and the second outer cylinder 22. As the molding material flows and fills, air is discharged from the escape holes 164 and 168, and excess molding material overflows from the escape holes 164 and 168.

  After the molding material is filled in the cavity, the molding material (rubber-like elastic material) undergoes a vulcanization reaction by holding the molding material in a pressurized and heated state for a certain period of time, and simultaneously the first inner cylinder 11 and the first outer cylinder. 12, vulcanized and bonded integrally to the second inner cylinder 21 and the second outer cylinder 22; As a result, the first anti-vibration base 113 and the second anti-vibration base 123 are formed.

  After molding, the lower mold 150, the upper mold 160 and the middle molds 181 and 182 are opened, and the runner plate 170 is separated from the upper surface of the upper mold 160. At that time, the molding material is cut off at the locations of the gates 163, 165, 167 and 169. At this time, the first injection trace portion 114 (see FIG. 5) and the second injection trace portion 124 are formed. By pushing up the support pins 151 (see FIG. 6) of the lower mold 150 upward, the vibration isolation device 101 in which the first vibration isolation base 113 and the second vibration isolation base 123 are formed can be detached from the lower mold 150. The vibration isolator 101 can be taken out.

  As described above, the injection hole 162 and the escape hole 164 of the first vibration isolation base 113 and the injection hole 166 and the escape hole 168 of the second vibration isolation base 123 are arranged in the axial direction of the second bush 120 (the vertical direction in FIG. 9). The first injection trace portion 114 and the second injection trace portion 124 of the vibration isolator 101 are arranged at positions that can be seen from one direction along the axial direction of the second bush 120. As a result, the routing of the injection holes 162 and 166 and the escape holes 164 and 168 of the upper mold 160 and the structure of the gates 163, 165, 167, and 169 can be simplified. Thereby, the rubber-like elastic material injected into the vulcanization mold (upper mold 160) can be hardly clogged with the gates 163, 165, 167, and 169. This can improve the life of the vulcanization mold. As a result, the cost required for vulcanization molding can be reduced.

  Further, the injection hole 162 and the escape hole 164 of the first vibration isolation base 113 and the injection hole 166 and the escape hole 168 of the second vibration isolation base 123 are arranged in one direction along the axial direction of the second bush 120 (the vertical direction in FIG. 9). Positioning the shaft of the second bush 120 without changing the direction of dividing (dividing) in the vulcanizing mold (the lower mold 150 and the upper mold 160) between the first bush 110 and the second bush 120. It can be in one direction along the direction. Since the first vibration isolating base 113 is provided with concave portions 113a and 113b that extend inward in the axial direction on the axial end face, the middle size is configured so as to be slidable in the axial direction of the first bush 110 (left and right in FIG. 7) Although 181 and 182 (slide mold) are necessary, the structure of the vulcanization mold can be simplified and the cost of the vulcanization mold can be reduced.

  Further, since the structure of the vulcanization mold can be simplified, the molding work including mold assembly and mold disassembly can be simplified. Thereby, the cost required for vulcanization molding of the vibration isolator 101 can be reduced. Furthermore, since the structure of the vulcanization mold can be simplified, the number of vibration isolation devices 101 per vulcanization mold can be increased, and the manufacturing cost of the vibration isolation device 101 can be reduced.

  Next, a third embodiment will be described with reference to FIGS. 10 and 11. In the first embodiment, the case where the second injection trace portion 24 is formed on the outer peripheral surface of the second vibration isolation base 23 has been described. On the other hand, in the third embodiment, a through-hole 22a is formed in the second outer cylinder 22 to which the second anti-vibration base 223 is bonded, and a molding material is injected from the through-hole 22a to thereby provide the second anti-vibration base. A case will be described in which 223 is formed and the second injection trace portion 224 is formed in the through hole 22a. In addition, the same part as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 10 is a plan view of the vibration isolator 201 according to the third embodiment.

  As shown in FIG. 10, the vibration isolator 201 includes a first bush 10 attached to an engine side (vibration generating side) (not shown) and a second bush 220 attached to a vehicle body side (vibration receiving side) not shown. And a connecting member 30 for connecting the first bush 10 and the second bush 220 to each other.

  The second bush 220 includes a second inner cylinder 21 attached to the vehicle body side, a second outer cylinder 22 positioned on the outer peripheral side of the second inner cylinder 21, and the second inner cylinder 21 and the second outer cylinder. And a second vibration isolating base 223 made of a rubber-like elastic material. The second anti-vibration base 223 is made of a rubber-like elastic material, and is integrally vulcanized and bonded to the second inner cylinder 21 and the second outer cylinder 22, and between the second inner cylinder 21 and the second outer cylinder 22. Are connected over the entire circumference.

  The second anti-vibration base 223 is set so that the axial length (the vertical direction in FIG. 10) is larger than the axial length of the second outer cylinder 22 and smaller than the axial length of the second inner cylinder 21. The second outer cylinder 22 is formed with a through hole 22a penetrating the inner peripheral surface and the outer peripheral surface in the same direction as the axial direction of the first bush 10 (perpendicular to the plane of FIG. 10), and a portion of the through hole 22a. A second implantation trace portion 224 is formed in the first. As a result, the first injection trace part 14 and the second injection trace part 224 of the vibration isolator 201 are arranged at positions that can be seen from one direction along the axial direction of the first bush 10 (the vertical direction in FIG. 10).

  Next, with reference to FIG. 11, the vibration isolator 201 manufactured by a vulcanization mold will be described. In FIG. 11, the lower mold 50 and the upper mold 260 of the vulcanizing mold are closed, and the first inner cylinder 11, the second inner cylinder 21, the first outer cylinder 12, and the second outer cylinder 22 are continuously provided. A state in which a rubber-like elastic material is filled in a cavity in which a connecting member 30 is set and formed is illustrated. Further, the illustration of the runner plate is omitted. FIG. 11 is a cross-sectional view of the vibration isolator 201 and the vulcanization mold (the lower mold 50 and the upper mold 260).

  As shown in FIG. 11, the upper mold 260 is a member configured to be mold-closeable and mold-openable with respect to the lower mold 50, and is disposed to face the lower mold 50. With the lower mold 50 and the upper mold 260 closed, the first inner cylinder 11, the first outer cylinder 12, the connecting member 30, the second inner cylinder 21, and the second outer cylinder 22 that are fitted and held in the lower mold 50. Is pressed and clamped. The fitted parts 260a and 260c of the upper mold 260 press and hold the first inner cylinder 11 and the second outer cylinder 12 fitted and held in the fitting holes 50a and 50c of the lower mold 50, and the fitted parts 260a, A molding surface 260b connected to 260c forms a cavity with the molding surface 50b. An inner cylinder presser 261 facing the support pin 51 is arranged at the axial center of the cavity. The fitting portion 260d presses and holds the connecting member 30 between the fitting hole portion 50d, and the fitting portion 260e presses and holds the second outer cylinder 22 fitted and held in the fitting hole portion 50e.

  The injection hole 266 communicates with an injection runner groove (not shown) at the upper end, penetrates the upper mold 260 in the vertical direction, and has a lower end formed in a through hole 22a formed in the second outer cylinder 22 via the gate 267. Communicate. The molding material constituting the second vibration isolation base 223 is injected from the injection hole 267 and filled between the second inner cylinder 21 and the second outer cylinder 22 and into the through hole 223a. The second vibration isolating base 223 is molded from the molding material injected between the second inner cylinder 21 and the second outer cylinder 22, and the injection portion 223a is molded from the molding material injected into the through hole 223a. Air or the like in the cavity is discharged from an escape hole (not shown). Similarly, the first vibration isolation substrate 13 is filled with a molding material from an injection hole (not shown), and the first vibration isolation substrate 13 having the straight portion 13b is molded.

  At the time of die-cutting after molding, the molded first anti-vibration base 13 and the unnecessary portion of the molding material are separated by a gate (not shown) to form the first injection trace portion 14 (see FIG. 10). . Further, the molded second vibration isolating base 223 and the unnecessary portion of the molding material are separated by the gate 267, and the second injection trace portion 224 (see FIG. 10) is formed in the injection portion 223a. As a result, the periphery of the root of the second injection trace portion 224 is restrained by the inner peripheral surface of the second outer cylinder 22 (around the through hole 22a).

  Here, at the root of the second injection trace portion 224, stress concentration is likely to occur due to elastic deformation of the second vibration isolation base 223, and cracks are likely to occur due to this. However, since the periphery of the root of the 2nd injection trace part 224 is restrained by the periphery of the through-hole 22a, the vibration isolator 201 can make the deformation amount of the root small. Thereby, it can prevent that the 2nd injection | pouring trace part 224 produces a crack, and can prevent that durability of the 2nd vibration-proof base 223 falls.

  Further, the second vibration isolation base 223 is formed such that the axial length (vertical direction in FIG. 10) is larger than the axial length of the second outer cylinder 22 and smaller than the axial length of the second inner cylinder 21. Therefore, the direction of dividing (dividing) in the vulcanizing mold (the lower mold 50 and the upper mold 260) is set to one direction along the axial direction of the first bush 10 (FIG. 11), and the slide mold and the like are omitted. And the structure of the vulcanization mold can be simplified.

  Next, a fourth embodiment will be described with reference to FIGS. In the third embodiment, a through-hole 22a is formed in the second outer cylinder 22 to which the second anti-vibration base 223 is bonded, and the second anti-vibration base 223 is formed by injecting a molding material from the through-hole 22a. Explained the case. On the other hand, in the fourth embodiment, a through-hole 12a is formed in the first outer cylinder 12 to which the first anti-vibration base 313 is bonded, and a molding material is injected from the through-hole 12a to thereby provide the first anti-vibration base. A case where 313 is molded will be described. The same parts as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and the following description is omitted. FIG. 12 is a side view of the vibration isolator 301 according to the fourth embodiment, and FIG. 13 is a plan view of the vibration isolator 301.

  As shown in FIG. 12, the vibration isolator 301 includes a first bush 310 attached to an engine side (vibration generating side) (not shown) and a second bush 120 attached to a vehicle body side (vibration receiving side) not shown. And a connecting member 30 for connecting the first bush 310 and the second bush 120 to each other.

  The first bush 310 includes a first inner cylinder 11 attached to the vehicle body side, a first outer cylinder 12 positioned on the outer peripheral side of the first inner cylinder 11, and the first inner cylinder 11 and the first outer cylinder. 12 and a first anti-vibration base 313 made of a rubber-like elastic material. The first anti-vibration base 313 is made of a rubber-like elastic material, and is integrally vulcanized and bonded to the first inner cylinder 11 and the first outer cylinder 12, and between the first inner cylinder 11 and the first outer cylinder 12. Are connected over the entire circumference.

  The first vibration isolation base 313 is provided with a concave portion 313b that extends inward in the axial direction in a direction perpendicular to the axis connecting the first bush 310 and the second bush 120 on the axial end surface. Thus, the first vibration isolation base 313 is formed such that the axial length (vertical direction in FIG. 12) on the first outer cylinder 12 side is shorter than the axial length of the first outer cylinder 12. Further, as shown in FIG. 13, the first vibration isolation base 313 is formed with a straight portion 313a penetrating the axial end face in the axial direction (perpendicular to the paper surface of FIG. 13). Accordingly, in the first vibration isolation base 313, the spring constant in the direction connecting the first bush 310 and the second bush 120 (the left-right direction in FIG. 13) is orthogonal to the direction connecting the first bush 310 and the second bush 120. It is set to be smaller than the spring constant in the direction (vertical direction in FIG. 13).

  As shown in FIGS. 12 and 13, the first outer cylinder 12 is formed with a through hole 12 a penetrating the inner peripheral surface and the outer peripheral surface in the same direction as the axial direction (vertical direction in FIG. 13) of the second bush 120. Yes. An injection portion 313c into which a molding material (rubber-like elastic material) is injected is formed in the through hole 12a, and a first injection trace portion 314 is formed in the injection portion 313c. As a result, the first injection trace portion 314 and the second injection trace portion 124 of the vibration isolator 301 are arranged at positions that can be seen from one direction along the axial direction of the second bush 120 (the vertical direction in FIG. 12).

  In particular, the first outer cylinder 12 includes a through hole 12a formed through the outer peripheral surface and the inner peripheral surface of the first outer cylinder 12, and the first injection trace portion 314 is a rubber-like material injected into the through hole 12a. It is formed in the injection part 313c comprised from an elastic material. On the other hand, the second implantation trace part 124 is formed in the axial direction of the axial end surface of the second prevention base 123. Therefore, the axial direction of the 2nd bush 120 and the direction of the injection hole (not shown) of the 1st anti-vibration base | substrate 313 and the 2nd anti-vibration base | substrate 123 can be made to correspond. Thus, by using a slide mold (not shown) for forming the straight portions 313a and 313b on the first vibration isolation base 313, the direction of mold division (division) in the vulcanization mold (not shown) Can be in one direction along the axial direction of the second bush 120. As a result, the cost of the vulcanization mold can be reduced by simplifying the structure of the vulcanization mold. In addition, since the molding work including mold assembly and mold separation can be simplified, the cost required for vulcanization molding of the vibration isolator can be reduced.

  Further, since the first injection trace portion 314 is formed in the injection portion 313c made of a rubber-like elastic material injected into the through hole 12a formed through the first outer cylinder 12, the root of the first injection trace portion 314 is formed. Is restricted by the inner peripheral surface of the first outer cylinder 12 (around the through hole 12a). As a result, the amount of deformation of the root of the first injection trace portion 314 can be reduced, and the first injection trace portion 314 can be prevented from cracking. Thereby, it can prevent that the durability of the 1st anti-vibration base | substrate 313 falls.

  The first anti-vibration base 313 of the anti-vibration device 301 is positioned in the direction connecting the first bush 310 and the second bush 120 on the axial end face (left and right direction in FIG. 12) and in the axial direction (up and down direction in FIG. 12). Since the concave portions 313a and 313b are provided, the first vibration-isolating base 313 can be lowered in the direction in which the first bush 310 and the second bush 120 are connected. As a result, the vibration isolation performance of the vibration isolation device 301 can be improved.

  On the other hand, the first inner cylinder is projected in a direction (vertical direction in FIG. 13) perpendicular to the direction connecting the first bush 310 and the second bush 120 of the first vibration isolation base 313 and in the direction perpendicular to the axis of the first bush 310. The region p (see FIG. 13) overlapping 11 can be made relatively high in spring. By forming the first injection trace portion 314 in this region p, the amount of deformation of the root of the first injection trace portion 314 can be suppressed, so that the root can be prevented from cracking. Thereby, it is possible to prevent the durability of the first anti-vibration base 313 from being lowered while improving the anti-vibration performance of the anti-vibration device 301.

  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 and shapes given in the above embodiments are examples, and other numerical values can naturally be adopted. Further, the quantity, shape, dimension (outer diameter), protrusion length (height), etc. of the first injection trace portions 14, 114, 314 and the second injection trace portions 23, 123, 223 described in the above embodiments are examples. Yes, it is naturally possible to arbitrarily set the vibration isolator 1, 101, 201, 301 depending on the size of the vibration isolator, the structure of the vulcanizing mold, and the like.

  In each of the above-described embodiments, the case where the first inner cylinder 11, the first outer cylinder 12, the second inner cylinder 21, the second outer cylinder 22, and the connecting member 30 are made of a metal material has been described. Of course, it is not limited, and it is possible to use synthetic resin materials.

  In the above embodiments, the case where the first outer cylinder 12 and the second outer cylinder 22 are formed integrally with the connecting member 30 has been described. However, the present invention is not necessarily limited to this, and the first outer cylinder 12 is not necessarily limited thereto. Of course, it is possible to form the second outer cylinder 22 and the connecting member 30 by separate members and to connect them by welding or the like.

  Moreover, in each said embodiment, although the case where the connection member 30 was formed in rod shape was demonstrated, it is not necessarily restricted to this, What is comprised in flat form, a thing provided with a flange part, etc. Of course, it is possible to employ other connecting members in response to demands for weight reduction or the like.

  In each of the embodiments described above, the case where the first inner cylinder 11, the first outer cylinder 12, the second inner cylinder 21, and the second outer cylinder 22 are formed in a cylindrical shape has been described. Instead, it is naturally possible to adopt a rectangular tube shape according to the required characteristics.

  In each of the embodiments described above, the case where the straight portions 13a, 13b, 113a, 113b, 313a, and 313b are formed on the first vibration isolation bases 13, 113, and 313 has been described. However, the present invention is not necessarily limited thereto. Depending on the required characteristics, it is naturally possible to prevent the first vibration isolating substrate 13, 113, 313 from forming a straight portion.

  In each of the above embodiments, the case where the first bushes 10, 110, 310 and the second bushes 20, 120, 220 are formed in a bottomless cylindrical shape has been described. However, the present invention is not necessarily limited to this. As disclosed in JP-A-2005-23973 and the like, it is naturally possible to form a bottomed tube (tub shape).

  In each of the above embodiments, the torque rod for an automobile is exemplified as the vibration isolator 1, 101, 201, 301. Is done. Moreover, it is not limited to the object for motor vehicles, It can apply as an object for trains or other various connection rods.

1, 101, 201, 301 Anti-vibration device 10, 110, 310 First bush 11 First inner cylinder 12 First outer cylinder 12a, 22a Through hole 13, 113, 313 First anti-vibration base 13a, 13b, 113a, 113b , 313a, 313b Straight part 14, 114, 314 First injection trace part 20, 120, 220 Second bush 21 Second inner cylinder 22 Second outer cylinder 23, 123, 223 Second vibration isolation base 23a Protruding part (outer peripheral surface) )
24, 124, 224 Second injection trace 30 Connection member 50, 150, 250 Lower mold (part of vulcanization mold)
60, 160, 260 Upper mold (part of vulcanization mold)
62, 66, 162, 166, 266 Injection hole (part of vulcanization mold)
70,170 Runner plate (part of vulcanization mold)
181 and 182 Medium mold (part of vulcanization mold)
223a, 313c injection region p region

Claims (4)

A first inner cylinder formed in a cylindrical shape;
A first outer cylinder located on the outer peripheral side of the first inner cylinder;
A first bush including a first vibration isolation base interposed between the first inner cylinder and the first outer cylinder and made of a rubber-like elastic material;
A second inner cylinder formed in a cylindrical shape;
A second outer cylinder located on the outer peripheral side of the second inner cylinder;
A second bushing provided with a second vibration isolating base interposed between the second inner cylinder and the second outer cylinder and made of a rubber-like elastic material;
A vibration isolator comprising: a connecting member that connects the first outer cylinder and the second outer cylinder to both ends and connects the first bush and the second bush so that axial directions thereof are orthogonal to each other;
The first vibration isolation substrate includes a first injection trace portion connected to an injection hole when the first vibration isolation substrate is vulcanized by a vulcanization mold,
The second vibration isolation substrate includes a second injection trace portion connected to an injection hole when the second vibration isolation substrate is vulcanized by a vulcanization mold,
The anti-vibration device, wherein the first injection trace part and the second injection trace part are arranged at positions that can be seen from one direction along the axial direction of the first bush or the second bush. One of the first injection trace part or the second injection trace part is formed in the axial direction of the axial end face of the first vibration isolation base or the second prevention base,
The other of the first injection trace part or the second injection trace part is such that the axial end face of the first vibration isolation base or the second prevention base is more axial than the axial end face of the first outer cylinder or the second outer cylinder. 2. The vibration isolator according to claim 1, wherein the vibration isolator is formed on an outer peripheral surface located outside. The first outer cylinder or the second outer cylinder includes a through-hole formed so as to penetrate through an outer peripheral surface and an inner peripheral surface of the first outer cylinder or the second outer cylinder.
One of the first injection trace part or the second injection trace part is formed in the axial direction of the axial end face of the first vibration isolation base or the second prevention base,
The anti-vibration device according to claim 1, wherein the other of the first injection trace part and the second injection trace part is formed in an injection part made of a rubber-like elastic material injected into the through hole. . The first vibration isolation base is provided with a straight portion that is positioned in a direction connecting the first bush and the second bush on the end face in the axial direction and is recessed in the axial direction.
The first injection trace portion is formed in a region overlapping the first inner cylinder in a projection orthogonal to a direction connecting the first bush and the second bush and in a direction perpendicular to the axis of the first bush. The vibration isolator according to any one of claims 1 to 3, wherein the anti-vibration device is provided.

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