JP6974989B2 - Manufacturing method of anti-vibration device - Google Patents

Description

The present invention relates to a method for manufacturing a vibration isolator.

A vibration-proof bush has been conventionally known as a vibration-proof device. For example, the anti-vibration bush shown in Patent Document 1 includes a base member and a mounting member, and the base member is between an inner cylinder member (first member), an outer cylinder member (second member), and both of these members. The mounting member includes the press-fitting cylinder member and the second rubber member (rubber) extending from the outer peripheral surface of the press-fitting cylinder member to both sides in the radial direction with the press-fitting cylinder member interposed therebetween. It has an elastic body). Then, the extended tip of the second rubber member is in contact with the inner peripheral surface of the outer cylinder member.

Japanese Unexamined Patent Publication No. 2014-20419

By the way, in the anti-vibration bush shown in Patent Document 1, after the base member and the mounting member are vulcanized and molded, the mounting member is vulcanized along the axial direction from one end side and the other end side of the inner cylinder member of the base member. It is manufactured so that the base member holds the mounting member by press-fitting it externally. That is, in the case of Patent Document 1, the press-fitting cylinder member is externally fitted and press-fitted into the outer peripheral surface of the inner cylinder member, so that the press-fitting cylinder member is held on the outer peripheral surface of the inner cylinder member. Therefore, there is a problem that a large residual strain is generated in the second rubber member.

The present invention has been made in view of these points, and an object of the present invention is to reduce residual strain of a rubber elastic body.

In order to achieve the above object, in the present invention, a gap is provided between the first member and the rubber elastic body and at least one of the second member and the rubber elastic body, and these members are assembled as an assembly jig. After arranging it in, all the members were assembled.

Specifically, the present invention is a method for manufacturing a vibration isolator including a first member, a second member, and a rubber elastic body connecting between the first member and the second member. ..

In the first invention, the rubber elastic body is provided in a plurality of pieces, and has a first rubber elastic body and a second rubber elastic body having properties different from those of the first rubber elastic body, and forms the rubber elastic body. A molding step, a coating step of applying an adhesive to the adhesive surface between the first member and the elastic elastic body, and the adhesive surface between the second member and the elastic elastic body, and the first member and the elastic elastic body. An arrangement step of arranging the first member, the second member, and the rubber elastic body on an assembly jig with a gap provided between the two members and at least one of the second member and the rubber elastic body. And, in the assembly jig, at least one of the first member and the second member is moved or deformed so as to fill the gap, and the rubber elastic body is placed between the first member and the second member. The first member, the second member, and the assembly step of assembling the rubber elastic body so as to be held are included, and in the arrangement step, the gap relating to the first rubber elastic body and the second rubber elastic body. It is characterized in that the size is different from that of the gap.

As a result, in the arrangement step, the first member, the second member, and the rubber elastic body are provided with a gap between the first member and the rubber elastic body and at least one of the second member and the rubber elastic body. Is placed on the assembly jig, and in the assembly process, at least one of the first member and the second member is moved or deformed so as to fill the gap in the assembly jig, and rubber is placed between the first member and the second member. Since the first member, the second member, and the rubber elastic body are assembled so as to hold the elastic body, the strain generated in the rubber elastic body when the rubber elastic body is connected between the first member and the second member is reduced. It is possible to suppress the residual strain of the rubber elastic body.

As a result, in the placement process, the size of the gap related to the first rubber elastic body and the gap related to the second rubber elastic body are made different, so that each rubber can be assembled in the assembly process according to the properties of each rubber elastic body. The strain applied to the elastic body can be adjusted.

By the way, for example, a rubber elastic body having a low dynamic fold spring characteristic dislikes strain, while a rubber elastic body having a high damping spring characteristic allows strain to some extent. When both rubber elastic bodies are used in a vibration isolator, if the conventional manufacturing method of press-fitting a rubber elastic body is used, the rubber elastic bodies are distorted almost evenly, so that the rubber elasticity is particularly low. In the body, the spring characteristics of the low dynamic fold are lower than the strain applied.

Here, when the first rubber elastic body is a rubber elastic body having a spring characteristic of low dynamic fold and the second rubber elastic body is a rubber elastic body having a spring characteristic of high damping, according to the third invention. In the arranging step, the first rubber elastic body having a low dynamic double spring characteristic is obtained by providing the gap related to the first rubber elastic body larger than the gap related to the second rubber elastic body and then performing the assembly step. The spring characteristics of low dynamic times can be maintained without adding excessive strain.

As described above, according to the present invention, the strain generated in the rubber elastic body when the rubber elastic body is connected between the first member and the second member can be reduced, and the residual strain of the rubber elastic body can be reduced. It can be suppressed.

It is a perspective view of the anti-vibration device which concerns on embodiment of this invention. It is a front view of the anti-vibration device. It is sectional drawing of the assembly jig which shows the state before arranging each member of the anti-vibration device. It is a top view of the inner jig. It is a top view which shows the outside jig in a closed state. FIG. 3 is a view corresponding to FIG. 3 showing a state after each member of the vibration isolator is arranged on the assembly jig. It is a figure corresponding to FIG. 3 which shows the state after reducing the diameter of an outer cylinder. It is a figure which shows the comparison result of the anti-vibration device of this invention, and the conventional anti-vibration device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the invention, its applications or its uses.

(Structure of anti-vibration device)
As shown in FIGS. 1 and 2, the anti-vibration device 1 according to the present invention is an anti-vibration bush used for, for example, a rear suspension of an automobile, and has characteristics against vibration input in the vertical direction and in the front-rear direction of the vehicle. The characteristics for the input vibration are different.

The anti-vibration device 1 includes a cylindrical metal inner cylinder 20 (first member) and a cylindrical metal outer cylinder 21 (first member) arranged coaxially with the inner cylinder 20 so as to be separated from the outer periphery thereof. 2 members), the first rubber elastic bodies 22 and 22 disposed between the two members 20 and 21 via a thermosetting adhesive and connecting the two members 20 and 21, and the inner cylinder 20 and the outer cylinder 21. It is provided with second rubber elastic bodies 23, 23 which are disposed between the two via a thermosetting adhesive and connect between the two 20 and 21.

The inner cylinder 20 is fastened to a member on the vehicle body side by a bolt or the like inserted therein, while the outer cylinder 21 is press-fitted into a press-fit hole formed in the trailing arm. Each end of the inner cylinder 20 in the axial direction protrudes outward in the axial direction from each end of the outer cylinder 21 in the axial direction. The first rubber elastic body 22 and the second rubber elastic body 23 are arranged alternately in a non-contact state with a gap 24 (second gap) evenly provided in the circumferential direction of the cylinder. Specifically, the first rubber elastic body 22 is arranged so as to face each other with the inner cylinder 20 interposed therebetween in the vertical direction. The second rubber elastic body 23 is arranged so as to face each other with the inner cylinder 20 interposed therebetween in the front-rear direction of the vehicle.

The first rubber elastic body 22 is made of a single material made of natural rubber and has a spring property of low dynamic fold. On each end face of the first rubber elastic body 22 in the tubular axis direction, a substantially rectangular parallelepiped-shaped protrusion 22a protruding outward in the tubular axis direction from each end face is integrally formed. The protrusion 22a is for positioning the first rubber elastic body 22 on the assembly jig 3 described later. The first rubber elastic body 22 has a substantially rectangular parallelepiped shape, and the combined length of the length in the tubular axis direction and the length in the tubular axis direction of the protrusions 22a and 22a is substantially the same as the axial length of the outer cylinder 21. .. Further, the length of the first rubber elastic body 22 in the circumferential direction is smaller than one-fourth of the length of the outer circumference of the inner cylinder 20.

The inner side surface 22c of the first rubber elastic body 22 has an arc shape along the outer peripheral surface of the inner cylinder 20 and is in contact with the outer peripheral surface of the inner cylinder 20. On the other hand, the outer surface 22d of the first rubber elastic body 22 has an arc shape along the inner peripheral surface of the outer cylinder 21 and is in contact with the inner peripheral surface of the outer cylinder 21. A groove 22b is provided on the outer surface 22d of the first rubber elastic body 22 in the tubular axis direction. The groove 22d is provided to satisfy the low dynamic doubling spring characteristic required for the assembled vibration isolator 1.

The second rubber elastic body 23 is made of a composite material in which synthetic rubber such as SBR (styrene butadiene rubber) is mixed with natural rubber, and has high damping spring characteristics. That is, the second rubber elastic body 23 has different properties from the first rubber elastic body 22. The second rubber elastic body 23 has substantially the same shape and size as the first rubber elastic body 22, and has no groove 22b of the first rubber elastic body 22.

The inner side surface 23c of the second rubber elastic body 23 is in contact with the outer peripheral surface of the inner cylinder 20, while the outer surface 23d of the second rubber elastic body 23 is in contact with the inner peripheral surface of the outer cylinder 21. Similar to the first rubber elastic body 22, substantially rectangular parallelepiped protrusions 23a for positioning the second rubber elastic body 23 on the assembly jig 3 are formed on each end surface of the second rubber elastic body 23 in the tubular axial direction. ing.

By the way, for example, in the rear suspension, in the vertical direction, it is desired to reduce the dynamic spring characteristics so as not to interfere with road noise and the stroke of the tire, while in the front-rear direction of the vehicle, in order to supplement the damping performance in this direction. There is a demand to increase the damping force that absorbs vibration and shock.

Here, according to the above configuration, the dynamic spring characteristics are reduced by using a rubber elastic body having a low dynamic double spring characteristic for the first rubber elastic body 22 that functions against vibration in the vertical direction. By using a rubber elastic body having high damping spring characteristics for the second rubber elastic body 23 that functions against vibration in the front-rear direction of the vehicle, it is possible to increase the damping force that absorbs vibration and impact, and the above requirements are met. It is possible to realize the vibration isolator 1 that satisfies the requirements.

(Composition of assembly jig)
Hereinafter, the assembly jig 3 for manufacturing the vibration isolator 1 as described above will be described.

The assembly jig 3 is for reducing the diameter of the outer cylinder 21 to assemble the inner cylinder 20, the outer cylinder 21, and the rubber elastic bodies 22 and 23.

As shown in FIG. 3, the assembly jig 3 includes a metal inner jig 31 and a metal outer jig 32 arranged above the inner jig 31.

The inner jig 31 is for positioning the inner cylinder 20 and the rubber elastic bodies 22 and 23. The inner jig 31 has a substantially cylindrical shape, and a flange portion 31d is formed at the upper end thereof. A circular recess 31a for accommodating the inner cylinder 20 is formed on the upper end surface of the inner jig 31. The opening diameter of the recess 31a is slightly larger than the outer diameter of the inner cylinder 20, and the depth thereof is substantially the same as the axial length of the portion of the inner cylinder 20 protruding from the outer cylinder 21 at one end in the axial direction.

A positioning guide 31c for guiding the protrusions 22a and 23a of the rubber elastic bodies 22 and 23 is formed on the upper end surface of the flange portion 31d of the inner jig 31. As shown in FIG. 4, four positioning guides 31c are formed at equal intervals in the circumferential direction of the inner jig 31.

A groove 31b for accommodating the protrusions 22a, 22a, 23a, 23a of the rubber elastic bodies 22 and 23 is formed between the positioning guides 31c and 31c which are adjacent to each other in the circumferential direction of the inner jig 31.

Four grooves 31b are provided at equal intervals in the circumferential direction of the inner jig 31. The depth of the groove 31b is smaller than the height of the protrusions 22a and 23a of the rubber elastic bodies 22 and 23. The length of the groove 31b in the cylinder diameter direction is larger than the length of the protrusions 22a and 23a in the cylinder diameter direction.

The outer jig 32 is for positioning the outer cylinder 21. As shown in FIG. 5, the outer jig 32 includes eight jig pieces 32b having a substantially fan shape, and these are arranged radially. The outer jig 32 has a substantially cylindrical shape as a whole by combining eight jig pieces 32b. That is, the outer jig 32 is equally divided into eight jig pieces 32b by a plane including the axis of the outer jig 32.

The outer jig 32 is in an open state in which a gap is formed between the jig pieces 32b and 32b adjacent to each other in the circumferential direction of the outer jig 32, and the gap is closed to form the outer jig 32 in a cylindrical shape. It is possible to change to the closed state (the state shown in FIG. 5).

Each jig piece 32b has an inner peripheral curved surface 32c corresponding to the curvature of the outer peripheral surface of the outer cylinder 21, and by combining the jig pieces 32b with each other, the accommodating portion 33 having a circular cross section is formed by each inner peripheral curved surface 32c. It is formed. As shown in FIG. 3, the accommodating portion 33 is connected to the lower accommodating portion 33a into which the inner jig 31 is coaxially inserted via the lower accommodating portion 33a and the stepped portion 33b, and accommodates the outer cylinder 21. It is composed of an upper accommodating portion 33c for the purpose. The inner diameter of the upper accommodating portion 33c is larger than the inner diameter of the lower accommodating portion 33a. The inner diameter of the upper accommodating portion 33c in the closed state is smaller than the outer diameter of the outer cylinder 21 before the diameter reduction. Further, the inner diameter of the lower accommodating portion 33a in the closed state is larger than the outer diameter of the flange portion 31d of the inner jig 31. The height of the upper accommodating portion 33c of the outer jig 32 is larger than the axial length of the outer cylinder 21.

The outer cylinder 21 is placed on the step portion 33b so that the outer peripheral surface of the outer cylinder 21 and the inner peripheral surface of the upper accommodating portion 33c are in contact with each other. Inside the outer jig 32, the inner jig 31 is arranged so that the upper surface 33d of the step portion 33b and the upper surface 31e of the flange portion 31d of the inner jig 31 are flush with each other.

(Manufacturing method of anti-vibration bush)
Hereinafter, a method of manufacturing the vibration isolator 1 using the assembly jig 3 configured as described above will be described.

First, each rubber elastic body 22 and 23 is separately vulcanized and molded using a mold (not shown) for each rubber elastic body 22 and 23 (molding step).

Next, thermosetting adhesion is performed to the entire surfaces of the inner side surfaces 22c and 23c and the outer surfaces 22d and 23d of the rubber elastic bodies 22 and 23 (the adhesive surface between the inner cylinder 20 and the outer cylinder 21 and the rubber elastic bodies 22 and 23). Apply the agent (application process).

In this way, by applying the adhesive to the entire surfaces of the inner side surfaces 22c, 23c and the outer side surfaces 22d, 23d of the rubber elastic bodies 22, 23, in the assembly process described later, each of them accompanies the reduction in diameter of the outer cylinder 21. When the rubber elastic bodies 22 and 23 are deformed, unbonded portions are less likely to occur between the rubber elastic bodies 22 and 23 and the inner cylinder 20 and the outer cylinder 21.

Next, as shown in FIG. 3, the inner jig 31 and the outer jig 32 of the assembly jig 3 are prepared, and as shown in FIG. 6, the outer jig 32 is outside the upper accommodating portion 33c of the outer jig 32 in the open state. After accommodating the cylinder 21, the inner cylinder 20 is accommodated in the recess 31a of the inner jig 31. After that, the rubber elastic bodies 22 and 23 are arranged in the inner jig 31 so that the protrusions 22a and 23a of the rubber elastic bodies 22 and 23 are accommodated in the groove 31b of the inner jig 31. At this time, a gap 24 is formed between the rubber elastic bodies 22 and 23 that are adjacent to each other in the circumferential direction of the cylinder. Further, the inner side surfaces 22c and 23c of the rubber elastic bodies 22 and 23 are in contact with the outer peripheral surface of the inner cylinder 20, while the outer surfaces 22d and 23d of the rubber elastic bodies 22 and 23 and the inner peripheral surface of the outer cylinder 21 are in contact with each other. A minute gap 25 (first gap) is created between the two. That is, the inner cylinder 20, the outer cylinder 21, and the rubber elastic bodies 22 and 23 are arranged on the assembly jig 3 with a gap 25 provided between the rubber elastic bodies 22 and 23 and the outer cylinder 21 (that is, the inner cylinder 20, the outer cylinder 21 and the rubber elastic bodies 22 and 23 are arranged. Placement process).

Here, since the inner side surfaces 22c and 23c having a larger area than the outer surfaces 22d and 23d of the rubber elastic bodies 22 and 23 are brought into contact with the outer peripheral surface of the inner cylinder 20, the rubber elastic bodies 22 and 23 are stabilized. Can be supported.

Next, when the outer jig 32 is pressed inward in the radial direction by the outer jig displacement device (not shown) (see the arrow in FIG. 6), each of the jig pieces 32b and 32b of the outer jig 32 is pressed. The gap is filled, and the outer jig 32 changes from the open state to the closed state. Along with this, the outer cylinder 21 is reduced in diameter by the outer jig 32, and as shown in FIG. 7, the gap 25 between the outer cylinder 21 and the rubber elastic bodies 22 and 23 is filled, and the rubber elastic bodies 22 ,. 23 is precompressed. In this way, the outer cylinder 21 is deformed so as to fill the gap 25 in the assembly jig 3, and the rubber elastic bodies 22 and 23 are assembled so as to be held between the inner cylinder 20 and the outer cylinder 21 ( Assembly process). In this assembly step, the non-contact state of the rubber elastic bodies 22 and 23 adjacent to each other in the circumferential direction of the cylinder is maintained. After that, the outer jig 32 is opened, and the assembled vibration isolator 1 is taken out from the assembly jig 3.

Next, the assembled anti-vibration device 1 is put into a curing furnace (not shown), and the thermosetting adhesive applied to the rubber elastic bodies 22 and 23 of the anti-vibration device 1 is cured (curing step). After that, the vibration isolator 1 is taken out from the curing furnace.

As described above, the vibration isolator 1 is manufactured.

(effect)
From the above, according to the present embodiment, in the arrangement step, the inner cylinder 20 is provided with a minute gap 25 between the outer surface 22d of the first rubber elastic body 22 and the inner peripheral surface of the outer cylinder 21. The outer cylinder 21 and the elastic elastic bodies 22 and 23 are arranged on the assembly jig 3, and in the assembly process, the outer cylinder 21 is reduced in diameter so as to fill the gap 25 in the assembly jig 3, and the inner cylinder 20 and the outer cylinder are reduced in diameter. Since the inner cylinder 20, the outer cylinder 21 and the rubber elastic bodies 22, 23 are assembled so as to hold the rubber elastic bodies 22 and 23 between the inner cylinder 20 and the outer cylinder 21, each rubber elastic body is formed between the inner cylinder 20 and the outer cylinder 21. When the bodies 22 and 23 are connected, the strain generated in the rubber elastic bodies 22 and 23 can be reduced, and the residual strain of the rubber elastic bodies 22 and 23 can be suppressed.

By the way, when manufacturing the vibration isolator 1 having the first rubber elastic body 22 and the second rubber elastic body 23 having different properties, there is a method of using a multicolor molding machine, but the rubber elastic bodies 22 and 23 having different properties are available. Since the molding conditions of the above are different, such as the molding time, the performance of the vibration isolator 1 that can be manufactured by this method is limited. In addition, since there are restrictions on the die drawing direction, there are restrictions on the molding conditions in this respect as well.

Here, according to the present embodiment, since the rubber elastic bodies 22 and 23 can be separately molded under the optimum molding conditions, the rubber elastic bodies 22 and 23 having different properties that cannot be manufactured by the multicolor molding machine are provided. The vibration isolator 1 can be manufactured. Further, the degree of freedom in designing the materials and shapes of the rubber elastic bodies 22 and 23 can be improved.

Further, according to the present embodiment, since the non-contact state of the rubber elastic bodies 22 and 23 adjacent to each other in the tubular circumferential direction is maintained in all the steps after the arrangement step, the strain due to the contact between the rubber elastic bodies 22 and 23 is maintained. Is not generated, and the residual strain of each rubber elastic body 22 and 23 can be further suppressed.

(Comparison with conventional anti-vibration device)
Manufactured by press-fitting a vibration isolator 1 manufactured by the manufacturing method of the present embodiment, a conventional vibration isolator manufactured by a multicolor molding machine (hereinafter referred to as a multicolor vibration isolator), and a rubber elastic body. The results are shown in FIG. 8 in comparison with the conventional anti-vibration device (hereinafter referred to as a press-fit type anti-vibration device).

In the press-fit type vibration isolator, the rubber elastic body is press-fitted between the inner cylinder and the outer cylinder, so that the rubber strain rate of the rubber elastic body becomes high (indicated by Δ in FIG. 8). On the other hand, in the anti-vibration device 1, since the assembly process is performed after the gap 25 is provided in the arrangement process, the rubber strain rate of the rubber elastic bodies 22 and 23 can be suppressed, so that the anti-vibration device 1 is compared with the press-fit type anti-vibration device. It is advantageous (indicated by a circle in FIG. 8).

In the press-fit type vibration isolator, the rubber elastic body is precompressed by press-fitting, so that the adjustment range of the precompression rate of the rubber elastic body is narrowed (indicated by Δ in FIG. 8). On the other hand, in the vibration isolator 1, the precompression rate applied to the rubber elastic bodies 22 and 23 is determined by making the size of the gap 25 between the rubber elastic bodies 22 and 23 different from each other. Since each can be adjusted, it is advantageous compared to other methods (indicated by ⊚ in FIG. 8).

In the multicolor vibration isolator, since a plurality of rubber elastic bodies are molded at the same time, there are restrictions on the molding conditions of each rubber elastic body, and the degree of freedom in combining the rubber materials is low (indicated by x in FIG. 8). On the other hand, in the vibration isolator 1, since the rubber elastic bodies 22 and 23 are separately molded in the molding process, there are no restrictions on the molding conditions of the rubber elastic bodies 22 and 23, and the degree of freedom in combining the rubber materials is not limited. Is high (indicated by ◎ in FIG. 8).

In the multicolor anti-vibration device, since the rubber elastic body is directly molded between the inner cylinder and the outer cylinder, there are restrictions on the mold removal direction of each rubber elastic body, and the degree of freedom in the shape of the rubber elastic body is low. (Indicated by Δ in FIG. 8). On the other hand, in the vibration isolator 1, since the rubber elastic bodies 22 and 23 are separately molded in the above molding process, there are no restrictions on the molding conditions of the rubber elastic bodies 22 and 23, and the rubber elastic bodies 22 and 23 are not restricted. Has a high degree of freedom in shape (indicated by a circle in FIG. 8).

As described above, the anti-vibration device 1 has a higher degree of freedom in design than the multicolor type and press-fit type anti-vibration devices because there are no restrictions in terms of precompression rate, combination of rubber materials, and degree of freedom in shape. Since the rubber strain rate can be suppressed, the vibration isolation performance is further improved.

(Other embodiments)
In the above embodiment, four rubber elastic bodies 22, 23 are provided, but the present invention is not limited to this, and one, two, three, or five or more may be provided.

Further, in the above embodiment, the first rubber elastic body 22 and the second rubber elastic body 23 are alternately arranged with gaps 24 evenly formed in the circumferential direction of the cylinder, but the sizes of the gaps 24 may be different. good.

Further, in the above embodiment, the first rubber elastic body 22 is composed of a single material made of natural rubber as a raw material, but the present invention is not limited to this, and the first rubber elastic body 22 may be composed of a composite material in which synthetic rubber is mixed with natural rubber. ..

Further, in the above embodiment, the first rubber elastic body 22 and the second rubber elastic body 23 are composed of a single material or a composite material using natural rubber as a main raw material, but the present invention is not limited to this, and urethane and thermoplastic elastomers are used. Etc. may be used as the main raw material.

Further, in the above embodiment, the properties of the first rubber elastic body 22 and the second rubber elastic body 23 are different, but they may be the same.

Further, in the above embodiment, the adhesive is applied to the inner side surfaces 22c, 23c and the outer side surfaces 22d, 23d of the rubber elastic bodies 22, 23, but instead of or in addition to this, the outer peripheral surface of the inner cylinder 20 is applied. And may be applied to the portion corresponding to each rubber elastic body 22 and 23 on the inner peripheral surface of the outer cylinder 21.

Further, in the above embodiment, the coating step is performed after the molding step, but the present invention is not limited to this. For example, when the adhesive is applied only to the inner cylinder 20 and the outer cylinder 21, the molding step may be performed after the coating step. , Both steps may be performed substantially at the same time.

Further, in the above embodiment, the gap 25 is provided between each rubber elastic body 22, 23 and the outer cylinder 21, but instead of or in addition to this, each rubber elastic body 22, 23 and the inner cylinder 20 are provided. A gap may be provided between the rubber and the rubber. In this way, when a gap is provided between the elastic elastic bodies 22 and 23 and the inner cylinder 20, the inner cylinder 20 may be deformed so as to fill the gap.

Further, in the above embodiment, the size of the gap 25 related to the first rubber elastic body 22 and the size of the gap 25 related to the second rubber elastic body 23 are the same, but the sizes may be different. For example, the gap 25 related to the first rubber elastic body 22 may be larger than the gap 25 related to the second rubber elastic body 23.

By the way, for example, the first rubber elastic body 22 having a low dynamic fold spring characteristic dislikes strain, while the second rubber elastic body 23 having a high damping spring characteristic allows strain to some extent. When both rubber elastic bodies 22 and 23 are used in the vibration isolator 1, if the conventional manufacturing method of press-fitting the rubber elastic bodies 22 and 23 is used, the rubber elastic bodies 22 and 23 are strained almost evenly. Therefore, particularly in the first rubber elastic body 22 having a low dynamic fold spring characteristic, the applied strain reduces the low dynamic fold spring characteristic.

Here, as described above, when the gap 25 related to the first rubber elastic body 22 is made larger than the gap 25 related to the second rubber elastic body 23, the first rubber elastic body 22 having a low dynamic double spring characteristic is formed. Excessive distortion is not applied.

Further, in the above embodiment, the diameter of the outer cylinder 21 is reduced so as to fill the gap 25, but the diameter is not limited to this, and for example, depending on the shape structure of the first member and the second member according to the present invention, the first member At least one of the first member and the second member may be moved so as to fill the gap provided between the rubber elastic body and the rubber elastic body and at least one of the second member and the rubber elastic body.

Further, in the above embodiment, the manufacturing method of the anti-vibration device 1 according to the present invention is adopted for the anti-vibration bush used for the rear suspension, but the present invention is not limited to this, and for example, it may be adopted for an engine mount, a dynamic damper, or the like. good.

Further, in the above embodiment, the first member and the second member according to the present invention are the cylindrical inner cylinder 20 and the outer cylinder 21, respectively, but the first member and the second member are the polygonal cylinder-shaped inner cylinder and the outer cylinder, respectively. The outer cylinder may be used, or the first member may be a columnar or polygonal columnar member.

1 Anti-vibration device 20 Inner cylinder (first member)
21 Outer cylinder (second member)
22 1st rubber elastic body 23 2nd rubber elastic body
22a, 23a Protrusion 25 Gap
3 Assembly jig 31 Inner jig
31c Positioning guide
32 Outer jig
33 Containment section

Claims (1)

A method for manufacturing a vibration isolator including a first member, a second member, and a rubber elastic body connecting between the first member and the second member.
A plurality of the rubber elastic bodies are provided, and have a first rubber elastic body and a second rubber elastic body having properties different from those of the first rubber elastic body.
The molding process for molding the rubber elastic body and
A coating step of applying an adhesive to the adhesive surface between the first member and the rubber elastic body and the adhesive surface between the second member and the rubber elastic body.
The first member, the second member, and the rubber elastic body are provided with a gap between the first member and the rubber elastic body and at least one of the second member and the rubber elastic body. And the placement process of arranging the rubber on the assembly jig
In the assembly jig, at least one of the first member and the second member is moved or deformed so as to fill the gap, and the rubber elastic body is held between the first member and the second member. The assembly step of assembling the first member, the second member, and the rubber elastic body is included.
In the arrangement step, a method for manufacturing a vibration isolator whose size differs between the gap related to the first rubber elastic body and the gap related to the second rubber elastic body.

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