JPH07280014A - Bush assembly body and its manufacture - Google Patents

Abstract

PURPOSE:To facilitate the change of the fitting angle by a fitting part, improve the degree of freedom of the design through the applicability to various fitting parts with different fitting angle, and dispense with the removal and finishing of rubber burrs to realize the efficient manufacturing. CONSTITUTION:An inner side metal piece 3 consists of an inner cylindrical member 5 both ends of which are opened and the outer circumferential surface is covered with a rubber elastic body 4, and a pair of fitting members 6, 6 which are separated from the inner cylindrical member 5 and connected to the respective end parts of the inner cylindrical member 5. The respective fitting members consist of a flange part 61 which is abutted can and stopped by the end surface 51 of the inner cylindrical member by an abutting surface 64, a connecting part 62 which is extended inwardly in the axial X direction of the cylinder and press fitted into the inner circumferential surface of the inner cylindrical member, and a flat plate part 63 which is extended outwardly in the axial direction of the cylinder and where a flat surface 63a and a fitting hole 65 are formed. The respective fitting members may be connected to each other in a relatively rotatable manner through a sliding member, etc., around the axis of the cylinder to the inner cylindrical member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush assembly which constitutes a vibration-proof rubber bush such as a suspension link bush, a suspension arm bush, a shock absorber lower bush or an engine mount bush of an automobile, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as this type of bush assembly, one used to support a final reduction gear (differential gear unit) on a vehicle body is known (for example, see Japanese Utility Model Laid-Open No. 1-9696). ). As shown in FIG. 6, the inner cylinder member a as the inner metal fitting is supported inside the outer cylinder member c as the outer metal fitting via the vibration-proof rubber elastic body b, as shown in FIG. Both ends of a in the cylinder axis direction (generally left-right direction in the figure) are projected outward from the rubber elastic body b and the outer cylinder body c in the cylinder axis direction, and the respective projecting end portions are flattened to penetrate the mounting bolts. A hole d is formed to serve as a mounting portion e. The outer cylinder member c is integrally mounted on the final reduction gear side, while the inner cylinder member a is mounted on the vehicle body side by bolts that penetrate the respective mounting portions e at both ends of the inner cylinder member a. The rubber elastic body b prevents vibrations input from the outer cylinder member c side or the inner cylinder member a side. Further, the rubber elastic body b includes
A pair of opening windows f, f penetrating in the cylinder axis direction are formed at both side positions which are orthogonal to the cylinder axis and sandwich the inner cylinder member a from the main vibration input direction (vertical direction in the figure). , And a predetermined vibration isolation characteristic against the above-mentioned input vibration is obtained.

In a method of manufacturing such a bush assembly, first, both ends of an inner cylinder member or a round bar member having a predetermined length are flattened by press working, and a through hole d is formed in a flat surface g thus formed. Open to form the mounting parts e, e. next,
After the rubber elastic body b is integrally vulcanized and molded with the inner cylindrical member a having the mounting portions e, e formed at both ends as an insert material, the integrally molded product (bush assembly) is preliminarily bracketed. Generally, press-fitting is performed in the outer cylinder member c integrally connected to h.

[0004]

By the way, in the above-mentioned conventional bush assembly, the pair of the vent windows f,
The formation position of f is determined corresponding to the main vibration input direction, while the direction of the flat surface g of each mounting portion e, that is, the relative mounting position of the inner cylindrical member a with respect to the rubber elastic body b in the circumferential direction. Is determined according to the orientation of the mounting seat surface on the vehicle body side. Therefore, when it becomes necessary to connect the inner cylindrical member and the rubber elastic body so that the flat surface g intersects the pair of the window parts f, f obliquely depending on the mounting seat surface on the vehicle body side. There is.

However, at the time of integrally vulcanizing and molding the rubber elastic body b, it is necessary to insert and remove the insertion mold for molding each of the punched window portions f from the axial direction of the cylinder, and each mounting portion e as described above. Is arranged so as to intersect with the pair of extraction windows f, f, there is a possibility that the insertion die cannot be taken in and out. Therefore, due to the application of the bush assembly having flat mounting portions on both ends as described above, the degree of freedom in design is reduced by the combination of the main vibration input direction and the direction of the mounting seat surface on which the mounting portion is mounted. In addition to restrictions, there are cases where the above combinations are not applicable.
In addition, once the inner tubular member a and the rubber elastic body b are integrally molded, the combination of the direction of the mounting portion e and the main vibration input direction is fixed, which is a different combination. It becomes impossible to apply to the part of. Therefore, it is necessary to manufacture different bush assemblies for each of the above-mentioned combinations of applied parts, which leads to complicated manufacturing and management. Further, due to manufacturing tolerances between the mounting seat surface on the vehicle body side and the mounting portion e, if a positional deviation occurs in the circumferential direction around the cylinder axis, the rubber is already attached to the mounting seat surface in a stationary state. The elastic body b may remain in the twisting direction around the cylinder axis, and the predetermined vibration isolation characteristics may not be exhibited.

Further, in the integral vulcanization molding of the inner cylindrical member a and the rubber elastic body b, the mounting portions e of the inner cylindrical member exist outside both ends of the forming range of the rubber elastic body b. Rubber burrs i (see FIG. 6) are generated on the outer surfaces of the two mounting portions e, e along the split surface of the two-divided molding die, and a finishing process for removing the rubber burrs i is required after demolding. This finishing process requires a great deal of labor. In addition, the molding rubber material may also spread to the flat surface g side during molding due to the manufacturing tolerance of the wall thickness of the mounting portions e, e, and the through hole d may be closed by the rubber thin film j. In this case, the removal and finishing requires a great deal of work.

Further, since both mounting portions e, e exposed to the outside of the rubber elastic body b are integrally formed as a part of the inner cylindrical member a, the coating on the both mounting portions e, e is performed by the rubber elastic body b. Since it is after integral vulcanization and molding, the method of coating the both mounting portions e, e is limited, and efficient coating cannot be performed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to facilitate the change of the mounting angle by the mounting portion and to mount various mounting portions having different mounting angles. Even if it is applicable, the degree of freedom in design is improved, and the removal finishing of the rubber flash is not required to improve the manufacturing efficiency.

[0009]

In order to achieve the above object, the invention according to claim 1 is a bush assembly which is disposed inside an outer metal shell connected to one of a vibration source and a vibration receiver. The inner metal fitting having a pair of mounting portions for the other of the vibration source and the vibration receiving portion, and the outer metal fitting and the inner metal fitting are interposed between the inner metal fitting and the outer metal fitting to mutually A cylindrical rubber elastic body to be connected, the outer peripheral surface of the rubber elastic body is covered and supported by the outer shell metal fitting, while the inner metal fitting is disposed so as to penetrate the rubber elastic body. The pair of inner metal fittings, which are arranged so as to project on both sides of the elastic body, are provided at both ends in the longitudinal axis direction with flat surfaces and mounting holes penetrating the flat surfaces in a direction orthogonal to the longitudinal axis direction. Is attached To assume that. In this structure, the inner metal member has an inner peripheral member whose outer peripheral surface is covered with the rubber elastic body in a state where both ends are open, and an inner cylindrical member which is configured separately from the inner cylindrical member and is provided at both end portions of the inner cylindrical member. It is composed of a pair of mounting members that are respectively coupled. Then, each of the mounting members, a coupling portion that extends inward in the longitudinal axis direction from the end surface position of the inner tubular member and is joined to the inner peripheral surface of the end portion of the inner tubular member, and the end surface of the inner tubular member. It is composed of a contact surface that abuts and prevents movement inward in the longitudinal axis direction, and a flat plate portion that extends outward from the contact surface in the longitudinal axis direction and constitutes the mounting portion.

According to a second aspect of the present invention, in the first aspect of the invention, the inner peripheral surface of the inner cylindrical member and the outer peripheral surface of each mounting member are coupled to each other so as to be relatively rotatable about the longitudinal axis. It is a thing.

According to a third aspect of the present invention, in the invention according to the second aspect, between the inner peripheral surface of the inner tubular member and the connecting portion of each mounting member, the longitudinal axis of the inner tubular member and each mounting member is rotated. In this configuration, an annular sliding member that allows relative rotation of is inserted.

According to a fourth aspect of the present invention, in the first aspect of the invention, the rubber elastic bodies at both sides in the vibration input direction sandwiching the inner tubular member are formed with a draft window portion penetrating in the axial direction of the tubular member. It is a thing.

According to a fifth aspect of the present invention, there is provided a bush assembly disposed inside an outer metal shell connected to one of the vibration source and the vibration receiving portion, wherein the vibration source and the vibration receiving portion are provided. An inner metal fitting having a pair of mounting portions for the other, and a tubular rubber elastic body interposed between the inner metal fitting and the outer metal fitting to connect the outer metal fitting and the inner metal fitting to each other, The outer peripheral surface of the rubber elastic body is covered and supported by the outer shell member, while the inner metal member is disposed so as to penetrate the rubber elastic member and project on both sides of the rubber elastic member. And a pair of mounting portions each having a flat surface and mounting holes penetrating the flat surface in a direction orthogonal to the longitudinal axis. Assuming method. In this structure, first, as a member that constitutes the inner metal fitting, an inner cylindrical member whose both ends are open and an outer peripheral surface is covered with the rubber elastic body, and the above-mentioned mounting that is coupled to both ends of the inner cylindrical member The component member preparing step of forming the pair of mounting members that are to be formed separately from each other is performed. Next, an integral molding step of vulcanizing the rubber elastic body integrally with the inner tubular member is performed. Then, a joining step of joining the mounting members to both ends of the inner cylindrical member of the integrally molded product formed by the integrally molding step is performed.

Further, the invention according to claim 6 is the same as claim 5.
In the invention described above, the rubber elastic body in the integral molding step is formed in a shape such that the outer peripheral surface of the rubber elastic body can be press-fitted into the inner peripheral surface of the outer shell.

[0015]

With the above construction, in the invention according to claim 1,
Since the inner fitting is composed of the inner cylinder member and the pair of mounting members which are formed separately from each other, each mounting member can be retrofitted to the assembly of the inner cylinder member and the rubber elastic body. Becomes Therefore, regardless of the circumstances at the time of forming the rubber elastic body, it is possible to change the relative mounting position of each mounting member with respect to the rubber elastic body in the circumferential direction about the longitudinal axis at any mounting angle. Therefore, the degree of freedom in designing the mounting angle of the mounting portion with respect to the rubber elastic body is improved, and the application site is expanded.
In addition, since the mounting angle of each mounting member with respect to the inner cylinder member can be changed and applied according to the application site of the present bush assembly, versatility can be improved.

Even when the rubber elastic body is integrally vulcanized and molded with the inner metal member, only the inner cylindrical member is vulcanized and molded integrally with the rubber elastic body, and vulcanized integrally with each mounting member. Since there is no need to mold, there is no occurrence of sticking of rubber burrs to the above-mentioned mounting part when the conventional mounting part is integrally formed at both ends of the inner tubular member and partially vulcanized and molded into this integral part. This eliminates the need for the conventional rubber flash removal finishing. In addition, it is possible to apply a coating process to the mounting member in advance, so that the coating method is not restricted and the efficiency of the coating process is improved.

According to the second aspect of the present invention, in addition to the operation of the first aspect of the present invention, the inner peripheral surface of the inner tubular member and the outer peripheral surface of the mounting member are mounted so as to be relatively rotatable about the longitudinal axis. Therefore, even after each mounting member is mounted on the inner cylinder member, each mounting member can be relatively rotated about the longitudinal axis, and various mounting angles can be obtained by mass production of one type of bush assembly. Can be applied to.
As a result, the complexity of manufacturing and inventory control of parts can be eliminated. Moreover, even if the original mounting angle is deviated due to the manufacturing tolerance of the vibration generating source side of the application site or the vibration receiving side of the vibration receiving part side, the respective mounting members can relatively rotate about the longitudinal axis. , By fastening each mounting member to the mounting seat surface, etc. via mounting holes, the mounting members rotate relative to each other to match the mounting angle to the mounting seat surface, and the initial residual strain is generated in the rubber elastic body. There is nothing to do. This ensures that the rubber elastic body has a predetermined vibration damping characteristic.

According to the invention of claim 3, in addition to the action of the invention of claim 2, the inner cylinder member and each mounting member are provided between the inner peripheral surface of the inner cylinder member and the joint portion of each mounting member. Since an annular sliding member that allows relative rotation about the longitudinal axis with respect to and is interposed, relative rotation between each mounting member and the inner cylinder member is performed more smoothly, and the invention according to claim 2 is described. The action is more reliably obtained.

According to the invention described in claim 4, in addition to the operation according to the invention described in claim 1, the rubber elastic bodies located on both sides in the vibration input direction sandwiching the inner cylinder member are provided with a draft window portion penetrating in the longitudinal axis direction. Since it is formed, desired vibration damping characteristics can be obtained by setting the formation range and size of this window portion. Since each mounting member can be joined to the inner cylindrical member after being integrally molded with the rubber elastic body as described above, a pair of punched window portions having the above-described action can be formed in the rubber elastic body. It is possible to avoid that the insertion / removal of the insertion die for the operation is restricted by the above-mentioned mounting members. Therefore, regardless of the combination of the position where the pair of draft windows are formed on the rubber elastic body and the mounting angle of each mounting member to the rubber elastic body, the combination of the bush assembly can be realized. become.

Further, in the invention according to claim 5, a component member preparing step of preparing the inner metal member as a component component of the inner tubular member and both mounting members separate from each other, and the inner tubular member of the component members. The bush assembly is formed by an integral molding step of integrally vulcanizing the rubber elastic body and an internal fitting step of internally fitting and coupling the respective mounting members of the above-mentioned constituent members to the integrally molded product formed by this integral molding step. Since the manufacturing is performed, in the integral molding step, it is only necessary to insert the inner tubular member into the molding die of the rubber elastic body, and both mounting portions are projected to the outside of the conventional rubber elastic body. It is possible to eliminate the occurrence of adhesion of rubber burrs to both mounting portions when integrally vulcanization molding is performed with the inner metal fitting. After the integrally molded product is formed by this integral molding process, the mounting members are respectively connected to both ends of the inner cylindrical member of the integrally molded product in the inner fitting process. It becomes possible to mount the mounting member at a different mounting angle. For this reason, the integral molding step of molding the rubber elastic body integrally with the inner cylinder member can be facilitated in manufacturing without being restricted by the mounting angle, and the degree of freedom in design can be improved. In addition, it is possible to perform the coating process or the like on both of the mounting members in advance in a single state, so that the efficiency of the coating process or the like can be improved.

Further, in the invention described in claim 6, in addition to the operation according to the invention described in claim 5, in the integral molding step, the outer peripheral surface of the rubber elastic body is shaped to be press-fitted into the inner peripheral surface of the outer shell. Since it is formed, it can be attached to the outer shell by simply press-fitting it into the outer shell.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIGS. 1 and 2 show a bush assembly according to a first embodiment of the present invention mounted on a suspension link rod on the side of a vibration source. In the figure, reference numeral 1 denotes a bush assembly, and the bush assembly 1 is arranged by being press-fitted into an outer shell member 22 to be described later at one end of the suspension link rod 2.
This suspension link rod 2 has a rod body 21.
A cylindrical outer metal fitting 22 fixed to one end of the rod body 21 in the rod axis Y direction with the cylinder axis oriented in a direction orthogonal to the rod axis Y, and a cylindrical connecting metal fitting 23 fixed to the other end. The outer shell member 22 and the bush assembly 1 constitute a connecting portion on one end side of the suspension link rod 2.

As shown in FIG. 3, the bush assembly 1 is composed of an inner metal fitting 3 and a rubber elastic body 4 formed so as to surround the outer circumference of the inner metal fitting 3.

The inner metal member 3 is composed of an inner cylinder member 5 to which the rubber elastic body 4 is joined on the outer peripheral surface thereof, and a pair of mounting members 6 and 6 connected to both ends of the inner cylinder member 5, which are separate bodies. It is composed of those formed in. The inner cylinder member 5 is
It has substantially the same length as the rubber elastic body 4 in the cylinder axis X direction, which is the longitudinal axis direction, and has both ends opened, and the outer peripheral surface thereof is covered with the rubber elastic body 4 over substantially the entire length. Each of the mounting members 6 has a flange portion 61 formed to have an outer diameter substantially the same as that of the end surface 51 of the inner tubular member 5, and the flange portion 6.
The inner cylinder member 5 includes a connecting portion 62 extending inward in the cylinder axis X direction, and a flat plate portion 63 extending outward from the flange portion 61 in the cylinder axis X direction to form a mounting portion. The inner surface of the flange portion 61 in the cylinder axis X direction contacts the end surface 51 of the inner cylindrical member 5 to prevent the contact surface 6 from moving inward in the cylinder axis X direction.
4, the coupling portion 62 has an outer diameter corresponding to the inner diameter of the inner cylindrical member 5, and the end inner peripheral surface 52 is formed until the contact surface 64 contacts the end surface 51 of the inner cylindrical member 5. The inner cylinder member 5 is press-fitted and is coupled to the inner cylinder member 5 to the extent that rattling with the inner cylinder member 5 does not occur in the direction orthogonal to the cylinder axis X. Further, the flat plate portion 63 is formed with a mounting hole 65 which is orthogonal to the cylinder axis X and penetrates in a direction orthogonal to the flat surfaces 63a of the flat plate portion 63, and the flat surfaces 63a are provided in predetermined directions. Is connected to the vehicle body side through a bolt (not shown) which is coupled to the inner cylinder member 5 so as to face the above and is inserted into the mounting hole 65. Regarding the mounting angle of the flat plate portion 63, an angle in the circumferential direction around the cylinder axis X is determined so that each flat surface 63a is oriented in the same direction as the mounting seat surface on the vehicle body side. And an angle Z (see θ in FIG. 2) formed by the flat surface 63a with respect to an axis Z (see FIG. 2) orthogonal to the cylinder axis X.

The rubber elastic body 4 is vulcanized integrally with the inner cylinder member 5 as described later so as to surround the inner cylinder member 5 and become a substantially cylindrical shape coaxial with the cylinder axis X. is there. Further, the rubber elastic body 4 is formed with punched window portions 41, 41 penetrating in the cylinder axis X direction at both positions of the rod tubular Y direction sandwiching the inner tubular member 5, respectively. With respect to 41, stopper portions 42, 42 projecting from the inner cylinder member 5 side to both sides in the rod axis Y direction are integrally formed. In addition, on the outer peripheral portions of both end surfaces of the rubber elastic body 4 in the cylinder axis X direction, a triangular first projection 43 is provided at a position where the rod axis Y is projected and at the rod body 22 side (see FIGS. 1 and 2). And the cylinder axis X of each mounting member 6
Is integrally formed with the second protrusion 44 that indicates the mounting position in the circumferential direction with respect to the center, that is, the mounting position with the mounting angle θ. Reference numerals 45 and 45 denote enlarged diameter portions formed at both ends of the rubber elastic body 4 in the cylinder axis X direction, and are formed so as to have the same outer diameter as the outer shell member 22 so that both end surfaces of the outer shell member 22 are connected to each other. It is designed to cover.

Next, a method of manufacturing the bush assembly 1 having the above-described structure and a method of mounting the bush assembly 1 on the suspension link rod 2 will be described. In addition, the suspension link rod 2 has an outer shell member 22 and a connection member 23 integrally formed with the rod body 21 in advance by a welding means or the like, and is subjected to a process such as painting in advance.

The bush assembly 1 is manufactured and mounted by a component member preparing step of preparing the inner tubular member 5 constituting the inner metal fitting 3 and the pair of mounting members 6 and 6, and the inner tubular member 5. A step of integrally molding with the rubber elastic body 4, a step of press-fitting the integrally molded product 7 formed by this step into the outer shell member 22, and after this press-fitting step, each attachment to both ends of the inner tubular member 5 The joining process of the member 6 is provided.

In the constituent member preparing step, the inner cylindrical member 5 having a predetermined diameter, wall thickness and length and the pair of mounting members 6 and 6 having a predetermined shape are separately formed. Then, in the integral molding step, the prepared inner cylinder member 5 is disposed as an insert material in the molding die to vulcanize and mold the rubber elastic body 4, and the rubber elastic body 4 is formed on the outer peripheral surface of the inner cylinder member 5. To form an integrally molded product 7 which is vulcanized and adhered. Next, in a press-fitting step, an adhesive material is applied to the outer peripheral surface of the integrally molded product 7, and this is applied to the outer shell metal member 22 of the suspension link rod 2.
It is press-fitted inside and connected to the outer shell member 22. At this time, the circumferential position of the integrally molded product 7 is positioned and press-fitted so that the first protrusion 43 faces the rod body 21. As a result, it is possible to connect the two extraction windows 41, 41 and the stoppers 42, 42 to the outer shell fitting 22 in a state in which they are surely oriented to the rod axis Y. Then, in the joining step, the outer shell member 22
The inner cylindrical member 6 is press-fitted until the contact surface 64 of each mounting member 6 comes into contact with the end surface 51 of the inner cylindrical member 6 from the both end openings of the inner cylindrical member 5 connected to the inner cylindrical member 6. To be integrated together. At this time, the respective mounting members 6 are press-fitted by adjusting the mounting angle so that the flat plate portion 63 faces the second protrusion 44, whereby the flat surface 63a of each flat plate portion 63 is securely mounted on the vehicle body side. It can be fixed in the direction corresponding to.

Next, the operation of the first embodiment having the above-mentioned structure
The effect will be described.

As described above, in the bush assembly 1, the outer peripheral surface of the rubber elastic body 4 is connected to the outer shell 22 at one end of the suspension link rod 2. The connection fitting 23, which is the other end of the suspension link rod 2, is connected to another suspension component member on the tire side as a vibration generation source, while both attachment members 6, 6 of the bush assembly 1 are connected.
Is connected to a mounting seat surface on the vehicle body side serving as a vibration receiving portion via bolts inserted in the mounting holes 65. Vibration and impact force in the rod axis Y direction input from the tire side to the outer shell 22 is absorbed by the rubber elastic body 4 between the tire 3 and the inner shell 3, and the transmission of the vibration and impact force transmitted to the vehicle body side is reduced. Is fulfilled. At this time, the inner metal member 3 is attached to the rubber elastic body 4.
At the both side positions sandwiching the rod axis Y direction from the above
Since 1, 41 are formed, the desired vibration-damping characteristics can be obtained by changing the setting range and size of each of the window portions 41, and both stopper portions 42, 42 projecting in the rod axis Y direction. This prevents excessive relative deformation when a large impact force is input.

On the other hand, in the above-described embodiment, the inner metal member 3 and the pair of mounting members 6 and 6 each having the inner metal member 3 formed separately from each other.
Since it is configured by, it becomes possible to perform the work of connecting both the mounting members 6 and 6 to the inner cylindrical member 5 after the rubber elastic body 4 is integrally formed.
Regardless of the formation position and formation range of 1,41,
Further, regardless of the mounting angle of each mounting member 6 to the rubber elastic body 4, whatever the mounting angle and the combination of the double window portions 41, the combination of the bush assembly 1 can be realized. It will be possible. In other words, when the rubber elastic body b is integrally vulcanized with the inner metal fitting a having the flat plate-shaped mounting portions e (see FIG. 6) formed at both ends, it is necessary to form the draft windows f and f. The insertion / extraction of the insert die is restricted by the direction of the mounting portion e, and there is a possibility that the bush assembly cannot be formed due to the inability to insert / extract the insert die. There is no restriction at all, and a bush assembly 1 having a mounting portion having an orientation (mounting angle) corresponding to the mounting seat surface regardless of the orientation of the mounting seat surface on the vehicle body side
Can be formed. For example, the double window 41,
It is also possible to freely change the mounting angle of the mounting member 6 with respect to 41 and dispose the mounting member 6 at the position shown by the alternate long and short dash line in FIG. Therefore, the bush assembly 1
It is possible to easily expand the range of the region to which can be applied, and to improve the versatility of the bush assembly 1 and the degree of freedom in design.

Further, in the above-described manufacturing method of the present embodiment, in the integral molding step, only the inner cylindrical member 5 is vulcanized and molded integrally with the rubber elastic body 4, and both the mounting members 6 and 6 are integrally vulcanized. Since it is not necessary to perform vulcanization molding, the above-mentioned conventional mounting parts e, e in the case where the rubber elastic body b is integrally vulcanized with the inner metal fitting a having the plate-shaped mounting parts e formed at both ends.
It is possible to eliminate the occurrence of adhesion of the rubber flash to the. As a result, it is possible to omit the conventional rubber flash removal finishing, reduce the man-hours, reduce the cost, and facilitate the manufacturing. In addition, it is possible to perform the coating process on each of the mounting members 6 in advance in a single state, and the coating method is not restricted, and the efficiency of the coating process can be improved.

FIG. 4 shows another aspect of the first embodiment. That is, serrations 66 are engraved on the outer peripheral surface of the joint portion 62a of each mounting member 6a shown in FIG. 4, and the outer peripheral surface of the joint portion 62a is fitted into the inner peripheral surface 52 of the inner cylinder member 5 with a slight press fit. By doing so, the bush assembly 1a is configured. Thereby, each of the mounting members 6
a can be firmly coupled to the inner cylinder member 5 via the serration 66, and the work of fitting the respective mounting members 6a into the inner cylinder member 5 can be performed more easily than in the case of press fitting. . The serration 66 is preferably involute serration, and may have a key groove corresponding to the inner peripheral surface 52 of the inner tubular member 5.

<Second Embodiment> FIG. 5 shows a second embodiment. In the figure, reference numerals 8 and 8 denote sliding members, and the mounting members 6 are mounted on the inner cylindrical member 5 via the sliding members 8 so as to be relatively rotatable about the cylinder axis X. That is, the inner fitting 3a in the second embodiment is the inner tubular member 5
, A pair of sliding members 8 and 8 and a pair of mounting members 6 and 6, and the inner metal fitting 3a and the rubber elastic body 4 are provided.
The bush assembly 1a is composed of

Each of the sliding members 8 is formed as a bush type sliding bearing using, for example, a bearing alloy, and has a flange portion 8 which is in contact with the end surface 51 of the inner cylindrical member 5 at one end.
1 is formed. Then, the outer peripheral surface of each sliding member 8 is fitted and held on the end inner peripheral surface 52 of the inner cylindrical member 5 in the integrally molded product 7 after the above-mentioned integral molding, and the inner peripheral surface of each sliding member 8 is held. The outer peripheral surface of the coupling portion 62 of each mounting member 6 is fitted into the inner side of the inner cylindrical member 5 to be mounted. As a result, the attachment members 6 are connected to the inner tubular member 5 in a state where the sliding members 8 allow relative rotation around the tubular axis X.

Since the other structures of the second embodiment are the same as those of the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

In the case of the second embodiment, the inner peripheral surface 52 of the inner cylindrical member 5 and the connecting portion 62 of each mounting member 6 are mounted via the sliding member 8 so as to be relatively rotatable about the cylindrical axis X. Therefore, even after each mounting member 6 is coupled to the inner tubular member 5, the respective mounting members 6 can be relatively rotated about the tubular axis X, and the mounting seat surface on the vehicle body side can be oriented in any direction. Even if formed, it can be attached to the attachment seat surface. As a result, mass production of one type of bush assembly 1a makes it possible to apply to various mounting angle parts,
It is possible to eliminate the complexity of production / inventory management of various types of parts for each application site.

Even if the orientation of the mounting seat surface on the vehicle body side deviates from the original mounting angle due to manufacturing tolerances, each mounting member 6 can rotate relative to the cylinder axis X, so that each mounting member 6 is By fastening with bolts to the mounting seat surface or the like through the mounting holes 65, the mounting members 6 naturally rotate relative to each other along the mounting seat surface, and the rubber elastic body 4 does not generate initial residual strain. . This ensures that the rubber elastic body has a predetermined vibration damping characteristic.

Moreover, in the case of the second embodiment, the inner cylinder member 5
Since the sliding member 8 is interposed between the inner cylinder member 5 and each mounting member 6, the inner cylinder member 5 and each mounting member 6 are coupled with each other while allowing relative rotation around the cylinder axis X. The relative rotation between the mounting members 6 and the inner cylinder member 5 can be performed more smoothly, and the above-described actions and effects can be obtained more reliably.

The present invention is not limited to the first and second embodiments described above, but includes various other modifications. That is, in the above-described embodiment, the case where the bush assembly 1 is applied to the suspension link rod 2 is shown, but the present invention is not limited to this, and the suspension arm bush, the shock absorber lower bush, or
It can also be applied to engine mounts and the like.

In the first and second embodiments described above, the cylindrical metal fitting 22 is shown as the outer metal fitting to which the bush assembly 1 is mounted, but the invention is not limited to this, and the outer peripheral surface of the rubber elastic body 4 is sandwiched from both sides. You may comprise an outer metal fitting with the metal fitting of two parts.

In the first and second embodiments described above, the outer shell 22 for holding the outer peripheral surface of the rubber elastic body is provided on the vibration source side.
Although the case where each attachment member 6 is connected to the vibration receiving portion side is shown, the present invention is not limited to this and may be configured to be connected to the opposite side, for example.

Further, in the first embodiment, each mounting member 6 is
Are joined by being press-fitted into the inner cylinder member 5,
Not limited to this, as long as the attachment members 6 are attached to the bush assembly 1 or the suspension link rod 2 until the attachment members 6 do not fall off before being actually attached and fixed to the vehicle, the attachment members 5 and 6 may be connected to each other. Good. Therefore, each of the mounting members may be simply fitted into the inner peripheral surface of the inner cylindrical member, or in this case, may be loosely fitted to the extent that the relative rotation is possible about the cylinder axis X. That is, after the mounting members are mounted on the vehicle-body-side mounting seat, the relative distance between the mounting members in the cylinder axis X direction is fixedly regulated, so that the mounting members may not fall off the inner cylindrical member. Because there is no.

Further, in the manufacturing method, in the first and second embodiments, the integrally molded product 7 formed by the integrally molding process is press-fitted into the outer shell metal fitting 22, and then the two mounting members 6, 6 are attached.
Is connected to the inner cylinder member 5, but not limited to this,
For example, both the mounting members 6 may be fitted into the inner tubular member 5 of the integrally molded product 7, and then the integrally molded product may be press-fitted into the outer shell member 22. That is, the step of connecting both mounting members 6 to the inner tubular member 5 may be before or after the step of press-fitting the outer tubular member 22 after the step of integrally molding the inner tubular member 5 and the rubber elastic body 4.

[0046]

As described above, according to the bush assembly of the first aspect of the invention, the inner metal member is composed of the inner cylinder member and the pair of mounting members which are formed separately from each other. It becomes possible to attach each mounting member to the assembly of the inner cylinder member and the rubber elastic body. Thus, regardless of the circumstances at the time of forming the rubber elastic body, it is possible to change the relative mounting position of each of the mounting members with respect to the rubber elastic body in the circumferential direction about the longitudinal axis at any mounting angle. In addition to obtaining the above advantage, it is possible to change the attachment angle of each attachment member with respect to the inner cylinder member according to the application site of the bush assembly to obtain the application advantage. be able to. Therefore, it is possible to improve the degree of freedom in designing the mounting angle of the mounting portion configured by each mounting member with respect to the rubber elastic body, improve versatility, and expand the range of applicable sites. You can

Even when the rubber elastic body is integrally vulcanized and molded with the inner metal fitting, only the inner cylindrical member is vulcanized and molded integrally with the rubber elastic body, and vulcanized integrally with each mounting member. Since it is possible to eliminate the need for molding, the conventional mounting parts are integrally formed at both ends of the inner tubular member, and the rubber flash adheres to the mounting parts when partially vulcanized and molded into this integrated part. It is possible to eliminate the occurrence of the above, and it is possible to omit the conventional rubber flash removal finishing. In addition, it becomes possible to apply a coating process to the mounting member in advance, so that the coating method is not restricted and the efficiency of the coating process can be improved.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, a state in which the inner peripheral surface of the inner tubular member and the outer peripheral surface of the mounting member are relatively rotatable about the longitudinal axis. Since each mounting member is mounted on the inner cylinder member, the mounting member can be relatively rotated about the longitudinal axis even after the mounting member is mounted on the inner cylindrical member. Even if the mounting seat surface of the side or the vibration receiving portion side is formed in any direction, the mounting seat surface can be mounted. As a result, one type of bush assembly 1a can be mass-produced so that it can be applied to parts with various attachment angles, and the complexity of production / inventory management of many kinds of parts for each applicable part can be eliminated. it can.
Moreover, even if the original mounting angle is deviated due to the manufacturing tolerance of the vibration generating source side of the application site or the vibration receiving side of the vibration receiving part side, the respective mounting members can relatively rotate about the longitudinal axis. , By fastening each mounting member to the above-mentioned mounting seat surface via the mounting holes, the above-mentioned mounting members rotate relative to each other so as to match the mounting angle to the mounting seat surface, and the initial residual strain occurs in the rubber elastic body. Can be avoided. As a result, it is possible to surely obtain a predetermined vibration damping characteristic of the rubber elastic body.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, an inner cylinder member is provided between the inner peripheral surface of the inner cylinder member and the inner fitting portion of each mounting member. Since an annular sliding member that allows relative rotation with respect to each mounting member about the longitudinal axis is interposed, relative rotation between each mounting member and the inner cylinder member can be made smoother, The effect of the invention described in 2 can be obtained more reliably.

According to the invention described in claim 4, in addition to the effect according to the invention described in claim 1, in addition to the effects of the invention described in claim 1, the draft windows penetrating in the longitudinal direction in the rubber elastic bodies at both sides in the vibration input direction sandwiching the inner tubular member. Even if the forming range and size of the parts are variously changed to obtain the desired vibration damping characteristics, both mounting members can be separated from the inner cylinder member and joined to the inner cylinder member after the rubber elastic body is formed. Therefore, it is possible to avoid that the insertion / removal of the insertion mold for forming the pair of extraction windows in the rubber elastic body is restricted by the respective mounting members. Therefore, regardless of the combination of the formation position of the pair of extraction windows on the rubber elastic body and the mounting angle of each mounting member to the rubber elastic body, the bush assembly can be formed in that combination. It can be performed easily and surely, and the scope of application can be further expanded.

According to the bush assembly manufacturing method of the fifth aspect of the present invention, a component member preparing step of preparing the inner metal member as a component member separate from each other of the inner tubular member and both mounting members, An integral molding step of vulcanizing and molding a rubber elastic body integrally with the inner tubular member of the constituent members, and the mounting members of the above constituent members are internally fitted and coupled to the integrally molded product formed by the integral molding step. Since the bush assembly is manufactured by the inner fitting process, only the inner cylinder member needs to be inserted into the molding die of the rubber elastic body in the above-mentioned integral molding process. It is possible to eliminate the occurrence of adhesion of the rubber burrs to the both mounting portions when integrally vulcanization molding is performed with the inner metal fitting in which both the mounting portions project toward one side. After the integrally molded product is formed by this integral molding process, the mounting members are internally fitted to the openings at both ends of the inner cylindrical member of the integrally molded product in the inner fitting process. The mounting member can be mounted at a different mounting angle, the integral molding process can be performed without being restricted by the mounting angle, and the manufacturing can be facilitated and the design flexibility can be improved. In addition, it is possible to perform the coating process and the like on both of the mounting members in advance in a single state, and it is possible to improve the efficiency of the coating process and the like.

Further, according to the invention of claim 6, in addition to the effect of the invention of claim 5, the outer peripheral surface of the rubber elastic body can be press-fitted into the inner peripheral surface of the outer shell in the integral molding step. Since it is formed in a shape, it can be attached to the outer shell metal fitting by simply press-fitting it.

[Brief description of drawings]

FIG. 1 is a perspective view of a suspension link rod equipped with a bushing assembly according to a first embodiment of the present invention.

FIG. 2 is a right side view with a part of FIG. 1 omitted.

FIG. 3 is a vertical sectional view of the first embodiment of FIG.

FIG. 4 is a view corresponding to FIG. 3, showing another aspect of the first embodiment.

FIG. 5 is a view corresponding to FIG. 3 showing a second embodiment.

FIG. 6 is a perspective view showing a conventional bush assembly.

[Explanation of symbols]

1, 1a Bush assembly 2 Suspension link rod (vibration source) 3, 3a Inner metal fitting 4 Rubber elastic body 5 Inner cylinder member 6, 6a Mounting member 7 Integral molded product 8 Sliding member 21 Outer shell metal fitting 41 Inside window 51 End surface of tubular member 52 Inner peripheral surface of inner tubular member 62, 62a Coupling portion (internal fitting portion) 63 Flat plate portion 63a Flat surface 64 Contact surface 65 Mounting hole X Cylindrical axis (longitudinal axis)

Claims (6)

[Claims] 1. A bushing assembly disposed inside an outer shell connected to one of a vibration source and a vibration receiving portion, wherein a pair of mounting portions for the other of the vibration source and the vibration receiving portion is provided. An inner metal member having, and a cylindrical rubber elastic body which is interposed between the inner metal member and the outer metal member and connects the outer metal member and the inner metal member to each other, and an outer peripheral surface of the rubber elastic member is provided. The inner metal fitting is covered and supported by the outer metal fitting, while the inner metal fitting is arranged to penetrate through the rubber elastic body, and the inner metal fitting is arranged so as to project on both sides of the rubber elastic material. In a bush assembly having a pair of mounting portions each having a flat surface and a mounting hole penetrating the flat surface in a direction orthogonal to the longitudinal axis direction at both ends, the inner metal fitting has both ends. Outside with open An inner cylinder member whose surface is covered by the rubber elastic body, and a pair of mounting members which are formed separately from the inner cylinder member and are respectively coupled to both ends of the inner cylinder member, Each mounting member is in contact with the end surface of the inner cylinder member, and the connecting portion that extends inward in the longitudinal axis direction from the end surface position of the inner cylinder member and is joined to the inner peripheral surface of the end portion of the inner cylinder member. A bushing assembly comprising: a contact surface that prevents movement inward in the longitudinal axis direction; and a flat plate portion that extends outward in the longitudinal axis direction from the contact surface to form the mounting portion. 2. The bush assembly according to claim 1, wherein an inner peripheral surface of the inner tubular member and an outer peripheral surface of each mounting member are coupled to each other in a state of being relatively rotatable about a longitudinal axis. 3. The ring-shaped sliding member according to claim 2, which allows relative rotation of the inner cylinder member and each mounting member about a longitudinal axis between the inner peripheral surface of the inner cylinder member and the coupling portion of each mounting member. A bush assembly in which a moving member is interposed. 4. The bush assembly according to claim 1, wherein the rubber elastic bodies on both sides in the vibration input direction sandwiching the inner tubular member are formed with a draft window portion penetrating in the axial direction of the tubular member. 5. A bushing assembly disposed inside an outer metal shell connected to one of a vibration source and a vibration receiving part, wherein a pair of mounting parts for the other of the vibration source and the vibration receiving part are provided. An inner metal member having, and a cylindrical rubber elastic body which is interposed between the inner metal member and the outer metal member and connects the outer metal member and the inner metal member to each other, and an outer peripheral surface of the rubber elastic member is provided. The inner metal fitting is covered and supported by the outer metal fitting, while the inner metal fitting is arranged to penetrate through the rubber elastic body, and the inner metal fitting is arranged so as to project on both sides of the rubber elastic material. In the method for manufacturing a bushing assembly, the inner metal member is formed by providing a pair of mounting portions, each of which has a flat surface at both ends and a mounting hole penetrating the flat surface in a direction orthogonal to a longitudinal axis direction. As a member , An inner cylindrical member that is open at both ends and whose outer peripheral surface is covered by the rubber elastic body, and a pair of mounting members that are coupled to both ends of the inner cylindrical member and serve as the mounting portions are formed separately from each other. Component forming step, an integral molding step of integrally vulcanizing the rubber elastic body with the inner cylindrical member, and the above-mentioned attachment to both ends of the inner cylindrical member of the integrally molded product formed by this integral molding step. A method of manufacturing a bushing assembly, comprising a joining step of joining members. 6. The method of manufacturing a bush assembly according to claim 5, wherein the rubber elastic body in the integrally molding step is formed into a shape in which the outer peripheral surface of the rubber elastic body can be press-fitted into the inner peripheral surface of the outer shell.