JP2010210025A - Vibration control device, and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device of simple structure capable of securing a force for fastening a bracket and an outer cylinder to each other, and to provide a method of manufacturing the same. <P>SOLUTION: An outer cylinder 14 is formed by injection molding, and has resin filling ports 14H as resin filling parts. Only one of the resin filing ports 14H is formed inside a cylindrical part 14A. The outer cylinder 14 is pressed into the bracket 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a so-called bush type vibration isolator attached to a rear suspension arm, a trading arm, a torque rod, and other arm members of an automobile, and a method of manufacturing the vibration isolator.

  As the outer cylinder of the bush type vibration isolator, a metal one has been conventionally used, but a resin one is also employed. The resin outer cylinder has the advantage of being lightweight and easy to mold.

  On the other hand, when the outer cylinder is made of resin, the strength of the resin is lower than that of metal, and therefore it is conceivable that the outer cylinder may be damaged if the removal force is increased and press-fitted into the bracket.

  Therefore, in Patent Document 1, in a cylindrical vibration damping device in which a rubber bush having a resin outer cylinder, an inner cylinder, and a rubber elastic body disposed therebetween is press-fitted into a rigid bracket. By forming a recess in the inner surface of the bracket, the inner surface of the bracket has a stepped shape, while the outer surface of the outer tube has a substantially axial straight shape, and the outer tube is shrunk using elastic deformation of the resin. The bracket is press-fitted into the bracket, and the stepped portion of the bracket and the stepped portion of the outer cylinder are engaged with each other in the axial direction and in the withdrawal direction by the elastic restoring force after the press-fitting.

  Further, in Patent Document 1, the fastening force of the outer cylinder is secured by blasting the inner surface of the bracket to roughen the surface to increase the friction coefficient, or an engaging protrusion is formed at one end of the outer cylinder. It has been devised such as holding it against the end face of the bracket to prevent it from coming off.

  However, the technique of Patent Document 1 has the following disadvantages. That is, when a concave portion is formed on the inner surface of the bracket, or when the surface is roughened, a labor for processing occurs and the cost increases. Further, when an engaging projection is formed at one end of the outer cylinder, the projection is exposed outside the bracket.

Japanese Patent No. 3767645

  An object of the present invention has been made in consideration of the above facts, and a vibration isolator capable of securing a fastening force between a bracket and an outer cylinder with a simple configuration, and manufacture of the vibration isolator. Is to provide a method.

  In order to achieve the above object, a vibration isolator according to claim 1 of the present invention is a cylindrical bracket connected to one of a vibration generating portion and a vibration receiving portion, and is formed into a cylindrical shape in the cylinder of the bracket. An outer cylinder that is press-fitted and made of resin containing a fiber reinforcing material and in which the fibers are oriented in the circumferential direction, and is arranged on the inner circumference side of the outer cylinder and connected to the other of the vibration generating part and the vibration receiving part An inner cylinder; and an elastic body that is disposed between an inner circumferential surface of the outer cylinder and an outer circumferential surface of the inner cylinder, and connects the outer cylinder and the inner cylinder to each other.

  In the above configuration, the outer cylinder is made of resin including a fiber reinforcing material, and the fiber orientation is in the circumferential direction. Thereby, the intensity | strength of the circumferential direction improves and the pressure input to a bracket can be enlarged. Therefore, it is possible to easily prevent the outer cylinder from coming off without engaging the bracket and the outer cylinder or roughening the surface to increase the friction coefficient.

  Here, “the fibers are oriented in the circumferential direction” means that most of the fibers are arranged in the circumferential direction or a direction along the circumferential direction, and the fibers are arranged in a direction different from the circumferential direction. Is included. That is, it does not mean that the orientation of all fibers is completely circumferential.

  The vibration isolator according to claim 2 of the present invention is characterized in that the outer cylinder has one point of a resin injection port for injection molding.

  Thus, by setting the resin injection port as one point, it is possible to orient the fibers in the circumferential direction as compared with the case where a plurality of points are arranged in the circumferential direction.

  The vibration isolator according to claim 3 of the present invention is characterized in that the outer cylinder is a plurality of points at which resin injection ports for injection molding are arranged in the cylinder axis direction.

  Thus, by setting the resin injection ports as a plurality of points arranged in the cylinder axis direction, the fibers can be oriented in the circumferential direction as compared with the case where the resin injection ports are arranged as a plurality of points arranged in the circumferential direction.

  The vibration isolator according to claim 4 of the present invention is characterized in that the resin injection port is formed inside the outer cylinder.

  Thus, if the resin injection port is formed inside the outer cylinder, there is no obstacle such as the resin injection port being caught when press-fitting into the bracket, and the press-in can be performed smoothly.

  A vibration isolator manufacturing method according to claim 5 of the present invention is the vibration isolator manufacturing method according to claim 1, wherein when the outer cylinder is injection-molded, only from one resin injection port. Injecting resin.

  In this way, by setting the resin injection port when the outer cylinder is injection-molded to one point, the fibers are oriented in the circumferential direction as compared to the case where the resin injection port is a plurality of points arranged in the circumferential direction. Can do.

  A vibration isolator manufacturing method according to claim 6 of the present invention is the vibration isolator manufacturing method according to claim 1, wherein when the outer cylinder is injection-molded, a plurality of points are arranged in the cylinder axis direction. A resin is injected from the resin injection port.

  In this way, by making the resin injection port when the outer cylinder is injection-molded into a plurality of points arranged in the cylinder axis direction, compared to the case where the resin injection port is arranged in a plurality of points arranged in the circumferential direction, the fibers It can be oriented in the circumferential direction.

  As described above, according to the present invention, the fastening force between the bracket and the outer cylinder can be ensured with a simple configuration.

It is a disassembled perspective view which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is sectional drawing seen from the axial direction of the vibration isolator which concerns on embodiment of this invention. It is a side view of the vibration isolator which concerns on embodiment of this invention. (A) of the outer cylinder of embodiment of this invention is a sectional side view, (B) is an expanded view. (A) of the mold at the time of injection-molding the outer cylinder of embodiment of this invention is a sectional side view, (B) is sectional drawing seen from the axial direction. (A) of the outer cylinder which concerns on the modification of embodiment of this invention is a sectional side view, (B) is an expanded view. It is a sectional side view of the outer cylinder which concerns on the modification of embodiment of this invention. It is an expanded view of the outer cylinder which shows the orientation of a fiber when a plurality of resin injection ports are formed in the circumferential direction.

  Hereinafter, a vibration isolator according to an embodiment of the present invention and a method for manufacturing the vibration isolator will be described with reference to the drawings.

  1 to 3 show a vibration isolator 10 according to the present embodiment. The vibration isolator 10 includes a bracket 12, an outer cylinder 14, an inner cylinder 16, and a rubber elastic body 18.

  The outer cylinder 14 includes a cylindrical portion 14A and a flange portion 14B. The cylindrical portion 14A has a cylindrical shape and has a certain thickness. The thickness of the cylindrical portion 14A is about 1 mm to 4 mm. The flange portion 14B is formed continuously on the radially outer side of one end portion of the cylindrical portion 14A, and has a plate ring shape.

  The outer cylinder 14 is made of resin containing fiber reinforcement. As the resin, polyamide, polyacetal, polycarbonate, polybutylene terephthalate, or the like can be used. Moreover, glass fiber, carbon fiber, aramid fiber, etc. can be used as a fiber reinforcement. The fiber reinforcement is preferably contained in the resin material at about 10 to 60%.

  The outer cylinder 14 is formed by injection molding, and has a resin injection port 14H, which is a resin injection portion, as shown in FIG. The resin injection port 14H is configured at only one point inside the cylindrical portion 14A.

  A cylindrical inner cylinder 16 is disposed along the axial direction S on the inner peripheral side of the outer cylinder 14. A rubber elastic body 18 is disposed between the outer peripheral surface of the inner cylinder 16 and the inner peripheral surface of the outer cylinder 14, and the inner cylinder 16 and the outer cylinder 14 are elastically connected by the rubber elastic body 18. The rubber elastic body 18 is vulcanized and bonded to the outer peripheral surface of the inner cylinder 16 on the inner peripheral side, and vulcanized and bonded to the inner peripheral surface of the outer cylinder 14 on the outer peripheral side.

  The bracket 12 has a cylindrical shape, and is connected to one of the vibration generating part and the vibration receiving part of the vehicle by a connecting part (not shown). The outer cylinder 14 is press-fitted into the bracket 12. A connecting shaft (not shown) is inserted through the inner cylinder 16, and the inner cylinder 16 is fixed to the connecting shaft in the inserted state. The inner cylinder 16 is connected to the other of the vibration generating part or the vibration receiving part of the vehicle via the connecting shaft.

  Next, a method for manufacturing the outer cylinder 14 will be described.

  First, as shown in FIG. 5A, the inner mold 20 and the outer mold 22 divided into two for injection molding are set together. The inner mold 20 includes a resin injection flow path 20A. And the resin material containing a fiber reinforcement is inject | poured through 20A of resin injection flow paths.

  Here, the resin injection is performed from only one point on the inner peripheral side, and the fibers 15 mixed in the resin material are directed in the direction in which the resin material flows, mainly in the circumferential direction R. FIG. 4B shows an exploded view of the outer cylinder 14 cut in the axial direction. In the vicinity of the resin injection port 14H, the fibers 15 are directed radially around the resin injection port 14H. However, the fibers 15 face in the circumferential direction R as they are separated from the resin injection port 14H, and 2 on the opposite side to the resin injection port 14H. The flow from the direction is combined and directed in the axial direction S. Thus, by injecting resin from only one resin injection port 14H, the orientation of the fibers 15 can be set in the circumferential direction.

  After the resin injection, the inner mold 20 and the outer mold 22 are removed after a predetermined time, and the outer cylinder 14 is taken out.

  Next, a method for manufacturing the vibration isolator 10 will be described.

  First, the outer cylinder 14 molded as described above and the inner cylinder 16 are set so as to be coaxial with the outer cylinder 14 in a mold (not shown) for vulcanization molding of the rubber elastic body 18. Then, a rubber material is poured into the mold and vulcanized. The rubber elastic body 18 is bonded to the outer peripheral surface of the inner cylinder 16 and the inner peripheral surface of the outer cylinder 14 by vulcanization.

  A set of the outer cylinder 14, the inner cylinder 16, and the rubber elastic body 18 is press-fitted into the inner peripheral side of the bracket 12 by a press-fitting press device, and between the inner peripheral surface of the bracket 12 and the outer peripheral surface of the outer cylinder 14. It is fixed by the frictional force.

  In this embodiment, since the orientation of the fiber 15 of the fiber reinforcement mixed in the resin material constituting the outer cylinder 14 is the circumferential direction R, the outer side is compared with the case where the fiber is oriented in the axial direction. The circumferential strength of the cylinder 14 is high. Therefore, the pressure input to the bracket 12 of the outer cylinder 14 can be increased to prevent the outer cylinder 14 from coming off.

  Further, in this embodiment, since the resin injection port 14H is formed on the inner peripheral side of the outer cylinder 14, there is no obstacle such as the resin injection port 14H being caught when press-fitting into the bracket 12, and it is smoothly performed. Can be press-fitted.

  In this embodiment, the example in which the resin injection port 14H is only one point has been described. However, the resin injection port 14H has a plurality of points arranged in the axial direction S of the outer cylinder 14 as shown in FIG. (3 points in FIG. 6) may be used. By arranging the resin injection ports 14H in a line in the axial direction S, the flow of resin at the time of resin injection can be set to the circumferential direction R, and the fibers 15 can be oriented in the circumferential direction R ( (See FIG. 6B). Also in this case, the resin injection port 14H is preferably formed inside the outer cylinder 14.

In this embodiment, the example in which the resin material is injected from the inner peripheral side of the outer cylinder 14 has been described. However, the resin material may be injected from the outer peripheral side of the outer cylinder 14. In this case, as shown in FIG. 7, it is preferable to configure a recess 14 </ b> D in which at least the resin injection port 14 </ b> H is concave. By configuring the recess 14D, it is possible to prevent the resin injection port 14H from coming into contact with the bracket 12 during press-fitting into the bracket 12.
Note that the recess 14D may be configured only in the resin injection port 14H portion, or may be configured in the entire circumference of the outer cylinder 14.

  Further, when the outer cylinder 114 is manufactured by injection molding in which a plurality of resin inlets H are provided in the circumferential direction, as shown in FIG. 8 (in FIG. 8, there are six resin inlets H), the fibers of the fiber reinforcing material 115 is oriented in the axial direction S, and has a different orientation from the fiber 15 of the present embodiment.

10 Vibration isolator 12 Bracket 14 Outer cylinder 14H Resin injection port 15 Fiber 16 Inner cylinder 18 Rubber elastic body R Circumferential direction S Axial direction

Claims (7)

A cylindrical bracket connected to one of the vibration generator and the vibration receiver;
An outer cylinder that is cylindrical and press-fitted into the bracket cylinder, is made of resin containing fiber reinforcement, and the fibers are oriented in the circumferential direction;
An inner cylinder disposed on the inner peripheral side of the outer cylinder and connected to the other of the vibration generating section and the vibration receiving section;
An elastic body disposed between an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder, and connecting the outer cylinder and the inner cylinder to each other;
Anti-vibration device with   The vibration isolator according to claim 1, wherein the outer cylinder has a single resin injection port for injection molding.   2. The vibration isolator according to claim 1, wherein the outer cylinder is a plurality of points at which resin injection ports for injection molding are arranged in a cylinder axis direction.   The vibration isolator according to claim 2 or 3, wherein the resin injection port is formed inside the outer cylinder. It is a manufacturing method of the vibration isolator of Claim 1,
A method of manufacturing a vibration isolator, comprising: injecting resin from only one resin injection port when the outer cylinder is injection-molded. It is a manufacturing method of the vibration isolator of Claim 1,
A method of manufacturing a vibration isolator, comprising: injecting resin from a plurality of resin injection ports arranged in a cylinder axis direction when the outer cylinder is injection-molded.   The method for manufacturing a vibration isolator according to claim 5 or 6, wherein the resin injection port is formed inside the outer cylinder.

Images