JP2012042041A - Method for manufacturing antivibration rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress intrusion of rubber to both ends in the cylindrical axis direction of an outer tube, and improve durability of a rubber elastomer, in a method for manufacturing antivibration rubber.SOLUTION: Provided is a method for manufacturing a torque rod 1 having a first pipe member 23, a first outer tube 13, and a first rubber elastomer 33 formed between them. When the first rubber elastomer 33 is formed by vulcanization, a pressing part 81a not parallel with an end face 13c in a tube axial direction of the first outer tube 13 which is formed on a lower die 71 and an upper die 81 is pressed to an inner circumferential edge of an opening of the first outer tube 13 to chamfer the inner circumferential edge, so that intrusion of rubber to the end face 13c in the tube axial direction of the first outer tube 13 is suppressed, and a step is provided between the end face 13c in the tube axial direction of the first outer tube 13 and a tube axial direction end 53b in the outer circumferential edge of the first rubber elastomer 33.

Description

  The present invention relates to a method for manufacturing a vibration damping rubber used for, for example, a torque rod attached between an engine and a vehicle body to suppress displacement of the engine, a link part of a suspension of a vehicle, and the like.

  Conventionally, an anti-vibration rubber comprising an inner cylinder and an outer cylinder and a rubber elastic body interposed therebetween is known. Such a vibration-proof rubber can be obtained by, for example, press-fitting an integrally molded product obtained by vulcanizing and molding a rubber elastic body integrally with an inner cylinder body into an outer cylinder body provided on the torque rod body or the link body. And widely used as suspension link parts.

  By the way, recently, in order to omit the step of press-fitting an integrally molded product into the outer cylinder, the inner cylinder and the outer cylinder are mounted on a molding die, and the rubber elastic body is vulcanized integrally with the inner and outer cylinders. A method of manufacturing a vibration-proof rubber by molding has been adopted.

  For example, in Patent Document 1, a connecting member in which a first and a second outer cylinder are integrally formed, a first and a second inner cylinder, and a mass member are placed in a vulcanization mold and clamped. A torque rod in which a rubber-like elastic material is injected into a mold and vulcanized is disclosed.

JP 2008-094248 A

  By the way, in the method of mounting the inner cylinder body and the outer cylinder body on the molding die and vulcanizing and molding the rubber elastic body integrally with these inner and outer cylinder bodies, when the rubber elastic body is vulcanized, for example, the outer cylinder body In order to suppress the rubber from entering the end surface in the cylinder axis direction, the pressing part formed on the molding die and parallel to the end surface in the cylinder axis direction of the outer cylinder body is the inner peripheral edge of the opening of the outer cylinder body. In many cases, sealing is performed by pressing against the cylinder shaft.

  However, such a sealing method simply presses the pressing portion parallel to the end surface of the outer cylindrical body, so that a gap is easily generated between the end surface of the outer cylindrical body and the pressing portion. When the rubber elastic body is vulcanized and molded, if high-pressure uncrosslinked rubber enters the gap formed between the end surface of the outer cylinder and the pressing portion, it is applied to the end surface of the outer cylinder in the cylinder axis direction. As shown in FIG. 10, the adhesive that has been applied is flown to the inner peripheral edge portions of the cylindrical axial end surfaces 113 a and 113 c of the outer cylindrical body 113 and is not vulcanized and bonded to the both end surfaces 113 a and 113 c. There is a possibility that annular rubber films 143d and 143e are formed.

  As described above, when the rubber films 143d and 143e that are not vulcanized and bonded are formed on the both end surfaces 113a and 113c in the cylinder axis direction of the outer cylinder 113, the outer peripheral surface 143c of the rubber elastic body 143 and the inner peripheral surface of the outer cylinder 113 are formed. Even when vulcanized and bonded to 113e, the rubber films 143d and 143e are the starting points, and the rubber elastic body 143 is peeled off from the outer cylindrical body 113, or the rubber elastic body 143 is cracked. is there.

  Even if the rubber films 143d and 143e are not formed, as shown in FIG. 11 (a), the end surfaces 113a and 113c in the cylinder axis direction of the outer cylinder 113 and the outer circumferential surface 143c of the rubber elastic body 143 in the cylinder axis direction When the ends 143a and 143b are substantially flush with each other and the inner peripheral edge 113f of the opening of the outer cylindrical body 113 is present, as shown in FIG. The rubber elastic body 143 deformed by being sandwiched between the outer cylinder body 123 and the outer cylinder body 113 rides on the end surfaces 113a and 113c in the cylinder axis direction of the outer cylinder body 113. There is a risk of being damaged by the peripheral edge 113f. Such a flaw causes cracks, which causes a problem that the durability of the rubber elastic body 143 deteriorates. Then, the scratches caused by the inner peripheral edge 113f were deformed by the load being input and being sandwiched between the inner cylinder 123 and the outer cylinder 113, as shown in FIGS. 12 (a) and 12 (b). There is also a possibility that the stopper rubber 153 may occur when the stopper rubber 153 rides on the end surfaces 113a and 113c of the outer cylinder 113 in the cylinder axis direction.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an inner cylinder, an outer cylinder, and a method of manufacturing a vibration-proof rubber including a rubber elastic body. An object of the present invention is to provide a technique for suppressing rubber intrusion into both axial end faces and improving the durability of a rubber elastic body.

  In order to achieve the above object, in the present invention, the inner peripheral edge is chamfered by pressing a pressing portion that is not parallel to the end surface of the outer cylindrical body in the cylinder axial direction against the inner peripheral edge of the opening of the outer cylindrical body. By doing so, the seal is surely performed.

  Specifically, the first invention is directed to a method of manufacturing a vibration-proof rubber including an inner cylinder and an outer cylinder, and a rubber elastic body formed between the inner and outer cylinders.

  Then, when the rubber elastic body is vulcanized and molded, pressing portions formed on the upper mold and the lower mold of the molding die, which are not parallel to the end surface in the cylinder axial direction of the outer cylinder, By pressing against the inner peripheral edge of the opening of the body and chamfering the inner peripheral edge, it is possible to suppress the intrusion of rubber into the end surface of the outer cylindrical body in the cylindrical axis direction, and the cylindrical shaft of the outer cylindrical body A step is provided between the end face in the direction and the end in the cylinder axis direction at the outer peripheral edge of the rubber elastic body.

  According to the first aspect of the invention, unlike the sealing method in which a pressing portion parallel to this is pressed against the end surface of the outer cylinder in the cylinder axis direction from the cylinder axis direction, the inner peripheral edge of the opening of the outer cylinder is molded The inner peripheral edge of the opening of the outer cylinder and the pressing part are in close contact with each other by being pressed and chamfered by a pressing part that is formed in the mold and is not parallel to the end surface of the outer cylinder in the cylinder axis direction. Since the gap between the two disappears, the space can be reliably sealed.

  Further, by providing a step between the cylindrical axial end surface of the outer cylindrical body and the cylindrical axial end of the outer peripheral edge of the rubber elastic body, the rubber elastic body deformed by the input of the load is the cylinder of the outer cylindrical body. It is difficult to ride on the end face in the axial direction, and even if it rides, the rubber elastic body is hardly damaged because the inner peripheral edge of the opening of the outer cylinder is chamfered.

  As described above, in the method of manufacturing the vibration isolating rubber including the inner cylinder body, the outer cylinder body, and the rubber elastic body, the rubber can be prevented from entering the both end surfaces in the cylinder axis direction of the outer cylinder body and the durability of the rubber elastic body can be improved. Can be improved.

  According to a second invention, in the first invention, the inner peripheral edge is chamfered in an R shape.

  According to the second invention, the inner peripheral edge of the opening of the outer cylindrical body is crushed by the pressing portion and chamfered into a smooth R shape, so that the rubber deformed by the input of a load. The elastic body becomes more difficult to be damaged.

  According to a third invention, in the first invention, the inner peripheral edge is chamfered to an inclined surface.

  According to the third invention, the inner peripheral edge of the opening of the outer cylindrical body is crushed by the pressing portion and chamfered to the inclined surface, so that the rubber elastic body deformed by the input of the load is applied. Since it deform | transforms so that it may swell to a cylinder axial direction outer side along an inclined surface, it becomes difficult to ride on the end surface of the outer cylinder body of the cylindrical axis direction.

  In addition, when the inner peripheral edge of the opening of the outer cylinder is chamfered symmetrically with the cylinder axis, even if there is a dimensional error in the outer cylinder, the clamping force acting in the cylinder axis direction is caused by the inclined surface. Since the outer cylinder is converted into a force that pushes the outer cylinder in the cylinder radial direction symmetrically with the cylinder axis, the outer cylinder is guided to the center and positioning becomes easy.

  According to a fourth invention, in any one of the first to third inventions, the rubber elastic body is connected to a main spring portion that connects the inner cylinder body and the outer cylinder body, and to the outer cylinder body. And a stopper portion that abuts against the inner cylinder when the inner cylinder is displaced relative to the outer cylinder and acts as a stopper, and the main spring portion of the inner peripheral edge And the part corresponding to a stopper part is chamfered.

  According to the fourth invention, the inner peripheral edge of the opening of the outer cylindrical body is not chamfered over the entire circumference, but only the portions corresponding to the main spring portion and the stopper portion of the rubber elastic body are chamfered. Therefore, the vibration-proof rubber can be manufactured using the existing equipment without excessively increasing the clamping force of the mold.

  According to a fifth invention, in any one of the first to fourth inventions, the outer cylindrical body is made of an aluminum alloy.

  According to the fifth invention, by using a relatively soft aluminum alloy, it is possible to manufacture the vibration-proof rubber using the existing equipment without excessively increasing the clamping force of the mold.

  According to the manufacturing method of the vibration-proof rubber according to the present invention, the inner peripheral edge of the opening of the outer cylinder is formed on the molding die, and the pressing part is not parallel to the end surface in the cylinder axis direction of the outer cylinder. By being pressed and chamfered, the inner peripheral edge portion of the opening of the outer cylinder and the pressing portion are in close contact with each other, so that sealing can be reliably performed.

  Further, by providing a step between the end surface of the outer cylinder in the cylinder axis direction and the end of the rubber elastic body in the cylinder axis direction, it is difficult for the rubber elastic body to ride on the end surface of the outer cylinder in the cylinder axis direction. At the same time, the rubber elastic body is less likely to be damaged because the inner peripheral edge is chamfered even when it rides.

  As described above, the rubber can be prevented from entering the both end surfaces of the outer cylindrical body in the cylinder axial direction, and the durability of the rubber elastic body can be improved.

It is a figure which shows the torque rod which concerns on embodiment of this invention, The figure (a) is a top view, The figure (b) is a longitudinal cross-sectional view. It is arrow sectional drawing of the II-II line | wire of FIG. It is sectional drawing of the stopper part of a torque rod. It is a longitudinal cross-sectional view which shows typically the shaping die used for manufacture of a torque rod and the said torque rod. It is a schematic diagram explaining the manufacturing method of a torque rod in steps. FIG. 10 is a cross-sectional view of a main spring portion in a torque rod of Modification Example 1. FIG. 9 is a cross-sectional view of a stopper portion in a torque rod of Modification 1; FIG. 10 is a cross-sectional view of a main spring portion in a torque rod of Modification 2; FIG. 10 is a cross-sectional view of a main spring portion in a torque rod of Modification 2; It is sectional drawing of the main spring part in the conventional torque rod. It is sectional drawing of the main spring part in the conventional torque rod. It is sectional drawing of the stopper part in the conventional torque rod.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use. 2, 3, and 6 to 9, only the portions necessary for the description of the present embodiment are shown.

-Anti-vibration rubber-
FIG. 1 shows an embodiment in which an anti-vibration rubber according to the present invention is applied to a torque rod which is a kind of automobile engine mount. The torque rod 1 includes a torque rod main body 11, first and second pipe members 23 and 25 as inner cylinders, and first and second rubber elastic bodies 33 and 35.

  The torque rod main body 11 is cut out from an aluminum alloy shaped member produced by extrusion processing as is well known in the art, and has a substantially octagonal cylindrical first outer cylinder 13 and a cylindrical second outer cylinder. 15 and two ribs 7 and 7 connecting these outer cylinders 13 and 15. More specifically, the first and second outer cylinders 13 and 15 are connected by the two ribs 7 and 7 with a predetermined distance therebetween so that the respective axes are parallel to each other. In other words, the torque rod 1 has two large and small rubber bushes (first rubber bush (anti-vibration) having outer cylinders 13 and 15, pipe members (inner cylinders) 23 and 25, and rubber elastic bodies 33 and 35, respectively. The rubber) 3 and the second rubber bush 5) are combined through two ribs 7,7.

  The 1st and 2nd pipe members 23 and 25 are comprised by the round pipe made from aluminum (it may be made from iron) which has a through-hole in the center. The first pipe member 23 is provided inside the first outer cylindrical body 13 and the second pipe member 25 is provided inside the second outer cylindrical body 15, respectively. The first and second pipe members 23, 25 are provided. The first and second rubber elastic bodies 33 and 35 are firmly vulcanized and bonded to the outer periphery of each.

  The first rubber elastic body 33 is formed between the first pipe member 23 and the first outer cylinder 13 so as to connect the first pipe member 23 and the first outer cylinder 13. The second rubber elastic body 35 is formed between the second pipe member 25 and the second outer cylinder 15 so as to connect the second pipe member 25 and the second outer cylinder 15. .

  In other words, the first and second rubber bushes 3 and 5 are configured such that the pipe members 23 and 25 and the outer cylindrical bodies 13 and 15 are connected by the rubber elastic bodies 33 and 35, respectively, and the load acting between the both 3 and 5. Is elastically supported. Thus, for example, the first pipe member 23 of the relatively large-diameter first rubber bush 3 shown on the right side of FIGS. 1 and 2 is connected to a vehicle body side member (not shown), and on the left side of FIG. A second pipe member 25 of the relatively small-diameter second rubber bush 5 shown is connected to a power plant (not shown), and is configured to restrict swinging of the power plant around the roll inertia main axis.

  Further, the first rubber elastic body 33 has straight holes (space portions) 33a and 33b penetrating in the cylinder axis direction with the center of the first pipe member 23 and the second pipe member 25 sandwiching the first pipe member 23 therebetween. Two rods are formed so as to be opposed to the longitudinal direction of the rod (hereinafter simply referred to as the longitudinal direction), which is the direction connecting the centers of the two. The structure of the small-diameter second rubber bush 5 is the same as that of the large-diameter first rubber bush 3, but the second rubber elastic body 35 connecting the first pipe member 23 and the first outer cylinder body 13 is used. Are formed so that the straight holes 35a, 35a face each other in the direction perpendicular to the longitudinal direction with the second pipe member 25 interposed therebetween.

  By forming the straight holes 33a and 33b in this manner, the first rubber elastic body 33 has a main spring portion 43 that symmetrically connects the first pipe member 23 and the first outer cylindrical body 13 in the longitudinally perpendicular direction. , 43, each connected to the first outer cylindrical body 13, and when the first pipe member 23 is displaced relative to the first outer cylindrical body 13, it abuts against the first pipe member 23 to form a stopper action. It is divided into a first stopper portion 53 on the outside in the longitudinal direction and a second stopper portion 63 on the inside in the longitudinal direction. Thus, the first rubber bush 3 absorbs, for example, vibration around the roll axis of the power plant generated during idle operation of the engine (not shown) by deformation of the main spring portions 43 and 43, while the engine is started. When the power plant rolls greatly or shakes greatly, such as during sudden acceleration, the first pipe member 23 comes into contact with the first and second stopper portions 53 and 63 and the first pipe member beyond that The relative displacement between the first outer cylinder body 13 and the first outer cylinder body 13 is prevented, thereby restricting excessive rolling and shaking of the power plant.

  Furthermore, in the torque rod 1 of the present embodiment, as shown in FIG. 2, the inner peripheral edge 13 f of the portion corresponding to the main spring portions 43, 43 in the inner peripheral edge portion 13 g of the opening of the first outer cylindrical body 13. (See FIG. 5) is chamfered in an R shape. Thereby, between the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylinder 13 and the cylinder axis direction ends 43a and 43b on the outer peripheral edge 43c of the main spring portion 43, the R-shaped chamfered portions 13b and 13d are formed. A step is formed by the height. As described above, by providing a step between the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylinder 13 and the cylinder axis ends 43a and 43b at the outer peripheral edge 43c of the main spring portion 43, a load is input. Thus, the deformed main spring portion 43 is difficult to ride on the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylinder 13, and even when the main spring portion 43 rides on the inner peripheral edge of the opening of the first outer cylinder 13 Since 13f is chamfered in an R shape which is a smooth shape, the main spring portion 43 is hardly damaged.

  Further, in the torque rod 1 of the present embodiment, as shown in FIG. 3, the inner peripheral edge 13 f of the portion corresponding to the first stopper portion 53 in the inner peripheral edge portion 13 g of the opening of the first outer cylindrical body 13 is formed. It is chamfered in an R shape, and thereby, between the end surfaces 13 a and 13 c in the tube axis direction of the first outer cylinder 13 and the tube axis direction ends 53 a and 53 b on the outer peripheral edge 53 c of the first stopper portion 53, A step is formed by the height of the R-shaped chamfered portions 13b and 13d. As described above, by providing a step between the end surfaces 13a, 13c in the cylinder axis direction of the first outer cylinder 13 and the cylinder axis ends 53a, 53b at the outer peripheral edge 53c of the first stopper portion 53, a load is input. This makes it difficult for the first stopper portion 53 in contact with the first outer cylindrical body 13 to ride on the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylindrical body 13, and even if the first stopper portion 53 rides on the first outer cylinder 13 Since the inner peripheral edge 13f of the opening of the cylindrical body 13 is chamfered in an R shape that is a smooth shape, the first stopper portion 53 is hardly damaged. Of the inner peripheral edge 13g of the opening of the first outer cylinder 13, the inner peripheral edge 13f corresponding to the second stopper 63 is also chamfered in an R shape.

-Manufacturing method-
Next, the manufacturing method of the torque rod 1 according to the present embodiment will be described. Prior to the description of the manufacturing method, first, the molding dies 71 and 81 used for manufacturing the torque rod 1 will be described with reference to FIG. . FIG. 4 shows only the portions of the molding dies 71 and 81 that are directly related to the manufacturing method of the present invention.

  As shown in FIG. 4, the molding die has a lower die 71 and an upper die 81 that constitute a split surface perpendicular to the cylinder axis direction, and by combining these lower die 71 and upper die 81, In the molding die, a main spring is provided between the first pipe member 23 and the first outer cylinder 13 and a space for mounting the first pipe member 23 and the first outer cylinder 13 as an insert material. Cavities for molding the portions 43 and 43 and the first and second stopper portions 53 and 63 are formed. In addition, the code | symbol 79 and 89 in a figure show the core pin for hold | maintaining the 1st pipe member 23 with the attitude | position which orient | assigned the axial direction to the up-down direction, respectively. These core pins 79 and 89 are provided on the lower die 71 and the upper die 81, respectively, and are inserted inside the first pipe member 23 so as to sandwich the first pipe member 23 from the vertical direction. Hold.

  Further, on the mold surface that divides the space for mounting the first outer cylindrical body 13, the main spring portions 43 and 43 and the first and first of the inner peripheral edge 13 g of the opening of the first outer cylindrical body 13 are provided. 2 The pressing part 71a which is not parallel to the end faces 13a and 13c in the cylinder axis direction of the first outer cylinder 13 and is specifically recessed in an arc shape of a quarter in the part corresponding to the stopper parts 53 and 63. , 81a are formed.

  Next, a method for manufacturing the torque rod 1 using the molding dies 71 and 81 will be described. In the following description, a case where a portion corresponding to the first stopper portion 53 in the inner peripheral edge portion 13g of the opening of the first outer cylinder body 13 is chamfered by the upper mold 81 will be described. Chamfering is performed in substantially the same manner for the portions corresponding to the main spring portions 43 and 43 and the second stopper portion 63 in the inner peripheral edge portion 13g of the opening portion, and also when the lower die 71 is chamfered.

  First, an adhesive is applied to the torque rod main body 11 and the first and second pipe members 23 and 25, and then the torque rod main body 11 and the first and second pipe members 23 and 25 are used as insert materials on the lower mold 71. Installing. Next, as shown in FIG. 5A, the upper die 81 is overlapped with the lower die 71, and the molding dies 71 and 81 are clamped with a clamping force of 50 to 150 tons, which is a general clamping force.

  Then, the inner peripheral edge 13f of the opening of the first outer cylindrical body 13 made of a relatively soft aluminum alloy is pushed by a pressing portion 81a that is recessed in a quarter arc shape as shown in FIG. 5 (b). By being crushed, an R-shaped chamfer 13d is formed. In this way, the inner peripheral edge 13f of the opening of the first outer cylinder 13 is chamfered by the pressing portion 81a, so that the inner peripheral edge 13g of the opening of the first outer cylinder 13 and the pressing portion 81a are in close contact with each other. Then, since the gap between the both 13g and 81a disappears, the space is surely sealed, and thereby the rubber can be prevented from entering the end surface 13c of the first outer cylinder 13 in the cylinder axis direction. .

  Next, as shown in FIG. 5 (c), a predetermined rubber material is injected into the cavity 63 and held under a condition of a predetermined temperature and pressure for a predetermined time. The heating temperature is preferably 150 to 180 ° C., and the heating time is preferably about 3 to 30 minutes. Then, the mold is removed after being held for a predetermined time. However, by chamfering the inner peripheral edge 13f of the opening of the first outer cylinder 13, the end face 13c in the cylinder axis direction of the first outer cylinder 13 and the first A step is provided between the outer peripheral edge 53c of the stopper portion 53 and the cylindrical end 53b by the height of the R-shaped chamfered portion 13d.

  As described above, the rubber film is not formed on the end surface 13c in the cylinder axis direction of the first outer cylinder 13, and the end surface 13c in the cylinder axis direction of the first outer cylinder 13 and the first rubber elastic body. The torque rod 1 in which a step is provided through the chamfered portions 13b and 13d between the outer peripheral edge 33 and the cylindrical end 53b can be manufactured.

-Effect-
According to the present embodiment, unlike the sealing method in which the pressing portions parallel to the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylinder 13 are pressed from the cylinder axis direction, the opening of the first outer cylinder 13 is opened. The inner peripheral edges 13f and 13f of the portion are pressed by the pressing portions 71a and 81a formed on the lower die 71 and the upper die 81 and non-parallel to the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylinder 13. Since it is chamfered, the inner peripheral edge portions 13g, 13g of the opening of the first outer cylinder 13 and the pressing portions 71a, 81a are in close contact with each other, and the gap between both the portions 13g, 81a disappears. Sealed.

  Also, the end surfaces 13a and 13c in the cylinder axis direction of the first outer cylinder 13 and the main spring portions 43 and 43, and the cylinder axis direction ends 43a and 43b at the outer peripheral edges 43c and 53c of the first and second stopper portions 53 and 63, By forming a step between 53a and 53b, the main spring portions 43 and 43 and the first and second stopper portions 53 and 63 deformed by the input of a load are formed in the cylinder axis direction of the first outer cylindrical body 13. Since the inner peripheral edges 13f and 13f of the opening of the first outer cylinder 13 are chamfered into a smooth R shape even when riding on the end faces 13a and 13c, the load is reduced. The main spring portions 43 and 43 and the first and second stopper portions 53 and 63 which are deformed by the input are further hardly damaged.

  In addition, the inner peripheral edges 13f and 13f of the opening of the first outer cylinder 13 are not chamfered over the entire circumference, but the main spring portions 43 and 43 of the first rubber elastic body 33 and the first and second Since only the portions corresponding to the stopper portions 53 and 63 are chamfered and a relatively soft aluminum alloy is used as the first outer cylindrical body 13, the tightening force of the molding dies 71 and 81 is not excessively increased. The torque rod 1 can be manufactured using existing equipment.

(Modification 1)
As a first modification, the inner peripheral edges 13f and 13f corresponding to the main spring portions 43 and 43 are shown in FIG. 6, and the inner peripheral edges 13f and 13f corresponding to the first stopper portion 53 are shown in FIG. Are chamfered on each inclined surface. As a result, the first rubber elastic body 33 deformed by the input of the load is deformed so as to bulge outwardly in the cylinder axial direction along the chamfered portions (inclined surfaces) 13b and 13d. It becomes difficult to ride on both ends 13a and 13c in the cylinder axis direction of the body 13.

  In addition, since the two main spring portions 43 and 43 are substantially symmetric with respect to the longitudinal direction and the first and second stopper portions 53 and 63 are substantially symmetric with respect to the longitudinal direction, there is a dimensional error in the first outer cylinder 13. Even in this case, the clamping force acting in the cylinder axis direction is converted into a force that pushes the first outer cylinder 13 outwardly in the cylinder radial direction by the inclined surface, so that the first outer cylinder 13 is symmetric. Is guided to the center to facilitate positioning.

(Modification 2)
As a second modification, in FIG. 8, the inner peripheral edges 13 f and 13 f corresponding to the main spring portion 43 are chamfered in an R shape, and in FIG. 9, the inner peripheral edge 13 f corresponding to the main spring portion 43 is chamfered. , 13f are chamfered on the inclined surface, and the straight portion (the portion extending straight from the inner peripheral surface 13e of the first outer cylindrical body 13 in the cylinder radial direction) is removed from the main spring portion 43, and the outer peripheral edge of the main spring portion 43 is removed. The cylinder axis direction ends 43a and 43b in 43c are rubbed against the chamfered portions 13b and 13d. Thereby, the effect similar to the said embodiment can be acquired.

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

  In the above embodiment and the first and second modified examples, the anti-vibration rubber is applied to the torque rod 1. However, the present invention is not limited to this, and the inner cylinder and the outer cylinder are attached to the lower mold 71 and the upper mold 81, and a rubber elastic body. Any anti-vibration rubber can be applied as long as it is manufactured by vulcanization molding integrally with these inner and outer cylinders.

  Moreover, in the said embodiment, although the inner peripheral edge 13f of the opening part of the 1st outer cylinder 13 was chamfered by R shape or an inclined surface, not only this but the shape which does not damage the 1st rubber elastic body 33 Any shape may be chamfered.

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

  As described above, the present invention is useful for a method for manufacturing a vibration-proof rubber including an inner cylinder and an outer cylinder, and a rubber elastic body formed between these inner and outer cylinders.

1 Torque rod (anti-vibration rubber)
13 1st outer cylinder (outer cylinder)
13a, 13c End face 13f Inner peripheral edge 23 First pipe member (inner cylinder)
33 1st rubber elastic body (rubber elastic body)
43 Main spring portion 53 First stopper portions 43a, 43b, 53a, 53b Cylindrical axial ends 43c, 53c Outer peripheral edge 63 Second stopper portion 71 Lower mold (molding die)
81 Upper mold (molding mold)
71a, 81a pressing part

Claims (5)

An anti-vibration rubber manufacturing method comprising an inner cylindrical body and an outer cylindrical body, and a rubber elastic body formed between these inner and outer cylindrical bodies,
When the rubber elastic body is vulcanized and molded, pressing portions that are formed on the upper mold and the lower mold of the molding die and are not parallel to the end surface in the cylinder axial direction of the outer cylinder are provided on the outer cylinder. By pressing against the inner peripheral edge of the opening and chamfering the inner peripheral edge, it is possible to suppress the intrusion of rubber into the end surface of the outer cylindrical body in the cylindrical axis direction, and the cylindrical direction of the outer cylindrical body A method for producing a vibration-proof rubber, characterized in that a step is provided between an end surface and a cylindrical axial end at an outer peripheral edge of the rubber elastic body. In the manufacturing method of the vibration-proof rubber of Claim 1,
A method for producing a vibration-proof rubber, wherein the inner peripheral edge is chamfered in an R shape. In the manufacturing method of the vibration-proof rubber of Claim 1,
A method for producing a vibration-proof rubber, wherein the inner peripheral edge is chamfered on an inclined surface. In the manufacturing method of the vibration-proof rubber as described in any one of Claims 1-3,
The rubber elastic body is connected to a main spring portion that connects the inner cylindrical body and the outer cylindrical body, and the outer cylindrical body, and when the inner cylindrical body is relatively displaced with respect to the outer cylindrical body, And a stopper portion that abuts on the inner cylinder and performs a stopper action,
A method for producing a vibration-proof rubber, wherein a portion of the inner peripheral edge corresponding to the main spring portion and the stopper portion is chamfered. In the manufacturing method of the vibration-proof rubber as described in any one of Claims 1-4,
The outer cylinder is made of an aluminum alloy.

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