JPH10113931A - Manufacture of different kind rubber composite vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the mold cost and manhours of a vibration isolator. SOLUTION: A device comprises an inner fitment 2, an outer fitment 4, an arm section 6 and a main stopper section 10 protruded into a closed space 8, and the main stopper section 10 is formed of different hardness higher than that of a main body rubber 22 integrating the inner fitment 2, the outer fitment 4 and the arm section 6 all together. In that case, the inner fitment 2 and the outer fitment 4 are put into a mold, and the rubbers of different hardness are injected into the main body rubber 22 side and the main body stopper section 10 side respectively by runners of separate systems to form a fusion section 26 of the main body rubber 22 and the main stopper section 10 and connect the main body rubber with the stopper section. At that time, the rubber injection amount and the rubber injection start timing are adjusted to form a connecting section 24 and the fusion section 26 on the main stopper section 10 side to protect the product performance from the adverse effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a vibration isolator used for an engine mount, a suspension bush, and the like. It relates to the manufacturing method of the device.

[0002]

2. Description of the Related Art As a general structure of an anti-vibration device used for an engine mount or the like, an inner metal fitting, an outer metal fitting arranged outside at an interval, and a rubber arm for connecting the two metal fittings are provided. And a rubber main stopper portion protruding from the outer fitting side along the input direction of main vibration to be damped into the closed space formed between the arm portion and the outer fitting. is there.

[0003]

By the way, the arm portion is required to have some elasticity, and the main stopper portion is desired to be hardly elastically deformed. However, such an anti-vibration device is manufactured by injecting uniform rubber into the common mold by injection or the like in the arm portion and the main stopper portion. Therefore, a rubber portion having an arm portion and a main stopper portion having different hardness cannot be formed only by one-step process.

Accordingly, if rubbers having different hardnesses are to be injection-molded, a common mold cannot be used, and the mold must be manufactured in a multi-step process using a plurality of molds. Mold cost increases. In addition, since the mold is exchanged on the way, the number of manufacturing steps is increased. In addition, in the case of insert molding, quality control becomes difficult due to damage at the time of mold replacement.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a vibration isolator of a different rubber composite type in which an arm portion and a main stopper portion have different hardness and the like in one step.

[0006]

Means for Solving the Problems In order to solve the above problems, a first invention according to a method of manufacturing a composite rubber vibration isolator according to the present invention comprises an inner metal fitting, an outer metal fitting arranged outside the outer metal fitting with an interval, and A rubber arm that connects the two metal fittings, and a rubber projecting along the input direction of the main vibration to be isolated from the external metal fitting into a space formed between the arm and the external metal fitting. In the method of manufacturing a different rubber composite vibration damping device having the main stopper portion and the arm portion side, the composition or physical properties of the rubber or the both are different from each other, the arm portion is formed in the mold. And a main stopper runner for forming a main stopper. The two types of runners are provided. Injected, with fused connection with the rubber of the arm-side at both ends along the outer bracket of the main stopper part, characterized in that the formation of the fused portion to the main stopper portion.

According to a second aspect of the present invention, in the first aspect, a main stopper side cavity for forming a main stopper portion and an arm side cavity for forming an arm portion are provided, and different cavities are provided for the respective cavities. And the injection time of different kinds of rubber into each cavity is shifted so that a part of the rubber on the arm portion side goes into the cavity on the main stopper portion at the time of this injection.

A third invention is characterized in that, in the first invention, the amount of rubber injected into the main stopper portion side cavity for forming the main stopper portion is smaller than the capacity of the main stopper portion side cavity.

According to a fourth aspect of the present invention, when different types of rubber are injected by using the two systems of runners, a rubber reservoir is formed at a connection portion between the rubber on the arm portion side and the rubber on the main stopper portion side along the outer metal fitting. Characterized by

A fifth invention is characterized in that, in any one of the first to fourth inventions, the rubber of the main stopper is made of rubber having a higher hardness than the rubber of the arm.

[0011]

According to the first aspect of the present invention, when different kinds of rubber are separately injected from two systems of runners separately provided for the arm portion side and the main stopper portion into the same mold, An arm portion and a main stopper portion are respectively formed.

At this time, connecting portions with the arm portion are formed on both left and right sides of the main stopper portion, and a fusion portion formed by mixing different kinds of rubber is provided on the main stopper portion side. Set the rubber connection part formation position on the stopper part side
Regulations can be made so as not to affect product performance.

[0013] Therefore, since composite molding of different types of rubber can be performed using only one mold, molding can be performed in a single-step process without replacing the mold. Therefore, the mold is not complicated and the mold cost is not increased. In addition, the number of manufacturing steps does not need to be increased. Also,
Quality control becomes easier.

According to the second aspect of the present invention, the injection time of different types of rubber into the main stopper portion side cavity and the arm portion side cavity is shifted so that a part of the arm portion side rubber goes into the main stopper portion side cavity. Thus, the fusion portion can be reliably formed on the main stopper portion side by one injection molding.

According to the third aspect of the present invention, the amount of rubber injected into the main stopper side cavity is made smaller than the capacity of the main stopper part, so that a part of the arm part side rubber goes into the main stopper part side cavity. Thus, the fusion portion can be reliably formed on the main stopper portion side by one injection molding.

According to the fourth invention, when different kinds of rubber are separately injected by using the two runners and the rubber on the arm portion side and the rubber on the main stopper portion side are connected along the outer metal fitting, When a rubber reservoir is formed in this connection portion, rubber flowing from the arm portion side to the main stopper portion side or vice versa is easily stopped at the rubber reservoir portion, so that the main stopper portion and the arm portion side are easily separated, and the connection is made. It is possible to prevent adverse effects on product performance due to parts.

According to the fifth aspect of the present invention, any one of the above methods is used, and the hardness of the main stopper portion and the arm portion is reduced because the main stopper portion has a higher hardness than the arm portion as a different kind of rubber. Different vibration damping devices can be easily manufactured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. 1 is a front view of an engine mount to which the present invention is applied, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view of hardness showing a molding method.

As shown in FIGS. 1 and 2, the engine mount comprises a cylindrical inner fitting 2, an outer fitting 4 surrounding the inner fitting 2 in a substantially pentagonal shape with a space therebetween, and an inner fitting 2 and an outer fitting. 4 includes an arm portion 6 connecting between the arm members 4 and a main stopper portion 10 protruding from the outer fitting 4 to a closed space 8 surrounded by the arm portion 6 and the outer fitting 4.

The arm 6 extends in a substantially C-shape to the left and right about the inner metal fitting 2, and the upper part 12a of the connecting part 12, which is the base of the arm with the outer metal, has a round shape. . The central portion has an arm portion stopper 14 protruding upward. Both the main stopper 10 and the arm stopper 14 protrude upward in the drawing along the input direction X of the main vibration.

A closed space 16 is also formed between the upper side of the arm 6 and the outer metal fitting 4, and auxiliary stoppers 18 project from the outer metal fitting 4 on both sides of the arm stopper 14 in the closed space 16.

An edge rubber 20 is formed around the outer metal fitting 4, and the edge rubber 20 is provided on the arm 6 and the auxiliary stopper 1.
The main body rubber 22 is formed continuously and integrally with the base material 8, and is made of, for example, NR rubber having a hardness of about 45 to 65 Hs.

The main stopper 10 has a hardness higher than that of the main rubber 22 and is made of, for example, NR rubber having a hardness of about 50 to 75 Hs. The portion covers the outer metal fittings 4 and forms a connection portion 24 with the edge rubber 20. The connection portion 24 extends into the main stopper portion 10, and the rubber of the main stopper portion 10 and the main body portion rubber 22 extend from both left and right sides. A fusion portion 26 with rubber is formed.

The connecting portion 24 is formed at a position facing the closed space 8 on the side of the main stopper portion 10 distant from the lower portion 12b of the connecting portion 12 with the outer fitting of the arm portion, and does not affect the performance of the product. It has become.

In this embodiment, the minimum radius 28 of the outer fitting 4 is located at the portion where the fusion portion 26 is formed, and this radius is the other radius 29 a of the outer fitting 4.
It is smaller than any of b and c.

Reference numerals 30, 32, 34, 36 shown in FIG.
Denotes an injection gate on the side of the main body rubber 22, and 38 denotes an injection gate provided solely at substantially the center of the main stopper 10 on the side of the main stopper 10.

FIG. 3 shows a cross section of a rubber injection mold. An upper mold 40, a middle mold 42 and a lower mold 44 form a molding cavity, and an upper runner plate 46 and a lower runner plate 48 overlap on the upper mold 40. It is provided. The molding cavity includes a main stopper portion cavity 65 for forming a main stopper portion and an arm portion side cavity 66 for forming an arm portion.

An arm-side runner 50 is provided for communicating the upper runner plate 46 and the lower runner plate 48,
The arm-side runner 50 branches from the lower end of the arm-side injection path 56 extending downward from the vertical nozzle touch 54 provided on the upper surface of the runner block 52 to each of the injection gates 30 to 36.

Further, stopper runners 60 are formed in the upper runner plate 46 and the lower runner plate 48 so as not to overlap with the arm runners 50 on the same plane.
While communicating with the injection gate 38, the runner block 5
2 and communicates with a stopper side injection path 64 extending from the horizontal nozzle touch 62.

Next, a method of manufacturing the vibration isolator according to this embodiment will be described. In FIG. 3, a nozzle of a molding machine (not shown) for injecting the rubber material of the main body rubber 22 abuts on the vertical nozzle touch 54 and injects the rubber material of the main stopper portion 10 into the horizontal nozzle touch 62. Contact another nozzle.

Subsequently, when each rubber material is injected from each nozzle, the arm side injection path 56 and the arm side runner 50 are injected.
Is injected from the injection gates 30 to 36 through the injection gate 36 to form the main body rubber 22, and the injection gate 38 through the stopper side injection path 64 and the stopper side runner 60.
The main stopper portion 10 is formed by injecting the main stopper.

At this time, the rubber material on the side of the main body rubber 22 flows on the outer metal fitting 4 toward the left and right sides of the main stopper 10,
On the other hand, the rubber material on the side of the main stopper 10 flows on the outer fitting 4 in the left-right direction.

For this reason, a fusion portion 26 connected by the connection portion 24 and made of the rubber material of the main rubber portion 22 and the main stopper portion 10 is formed inside the main stopper portion 10 and sandwiches the connection portion 24. As a result, the main body rubber 22 whose rubber is softer than the main stopper 10 and the harder main stopper 10 are integrally formed.

At this time, the amount of rubber injected into the main stopper portion 10 is set to be smaller than the capacity of the main stopper portion 10, for example, about 70%, and the rubber injection start time of the main stopper portion 10 is earlier than that of the main body rubber 22. Then, the connection part 24
Can be formed at a position closer to the main stopper portion 10 than the fusion portion 26, and can be prevented from entering the arm portion 6 side and affecting product performance.

In addition, even if the rubber injection start time of the main stopper portion 10 and the main body portion rubber 22 is shifted, the entire injection time can be completed at about the same level as in the conventional case, and moreover, the mold is replaced to change the multi-stage. Since there is no need for molding, manufacturing man-hours and mold costs can be reduced.

FIGS. 4 to 6 show a second embodiment. This embodiment is the same as the previous embodiment except for the structure of the boundary between the rubber portion of the main body and the stopper. Therefore, the same reference numerals are used for the common parts, and duplicate description is omitted.

FIG. 4 is a view similar to FIG.
As shown in FIG. 5 which is a cross section taken along the line -5 and FIG. 6 which is a cross section taken along the line 6-6, the boundary between the main body rubber portion 22 and the main stopper portion 10 of the engine mount is a substantially discontinuous rubber parting portion. 70, and a rubber reservoir 72 is formed in the rubber parting portion 70.

As is apparent from FIG. 5, the rubber reservoir 72 wraps around the rubber 22 mainly into the rubber reservoir space 74 formed between the upper mold 40, the outer fitting 4 and the lower mold 44. It is formed by filling the rubber at the tip.

As is apparent from FIG. 6, the rubber reservoir space 7
The arm 4 and the main stopper 10 are provided with a clearance 4 (an interval of, for example, 1 or less) formed inevitably in the molding technique on the contact surface between the outer metal fitting 4 and the upper mold 40 and the lower mold 44. It communicates with the molding space.

Therefore, the rubber parting portion 70 and the arm portion 6
In addition, a substantially burrs-like connection portion having an extremely small thickness for connecting the main stopper portions 10 is formed (not shown). However, even with this connection, the arm 6 and the main stopper 10 are substantially separated with respect to the behavior as an elastic member.

In this manner, the boundary between the main stopper portion 10 and the main body rubber 22 can be clearly and more accurately defined, and the amount of rubber mixed into the main stopper portion 10 from the main body rubber 22 side can be reduced.

At this time, it is natural that the position of the rubber reservoir 72 is set to a position which does not affect the performance of the product, and the rubber reservoir 72 is closed such that it does not fall on the lower portion 12 b of the connecting portion 12 in the arm 6. There is a position facing the space 8.

The present invention is not limited to the above embodiments, but can be applied in various ways. For example, the rubber used is NR
Not only the system but also a CR system or the like can be appropriately selected. In addition, the same material or different materials can be appropriately combined with each other.

Further, when injecting the rubber, the time for injecting the rubber into the cavity 65 on the main stopper portion and the time for injecting the rubber into the cavity 66 on the arm portion are shifted.
In addition, either one or both of making the rubber injection amount into the main stopper portion side cavity 65 smaller than the capacity of the main stopper portion side cavity 65 can be used.

The difference in the rubber injection time means a difference in the timing of injecting the rubber into the cavities of the main stopper portion side cavity 65 and the arm portion side cavity 66. , Or the injection is started simultaneously for each runner, but the injection timing for each cavity can be shifted by changing the length of each runner. Furthermore, it is also possible to cause a difference in the speed of flowing through the runner by making the viscosity of the injected molten rubber different.

In addition, the shapes of the inner metal fitting and the outer metal fitting can be variously modified such as a cylindrical shape. In addition, as the injection method, a general injection method under normal pressure or a vacuum press can be adopted instead of injection. Furthermore, a combination of low hardness of the arm portion and a high hardness of the main stopper portion or a combination of the opposite arm portion of high hardness and a low hardness of the main stopper portion are possible. In addition, the materials used may be not only the same material but also a combination of materials having different physical properties (for example, damping characteristics) of the same series.
Further, a combination of the same hardness having different damping characteristics and the like is also possible.

Further, the present invention can be applied not only to the engine mount but also to a suspension bush and the like.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view of a mold.

FIG. 4 is a view corresponding to FIG. 1 of a second embodiment.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

[Explanation of symbols]

2: inner metal fitting, 4: outer metal fitting, 6: arm part, 8: closed space, 10: main stopper part, 22: main body rubber, 24: connection part, 26: fusion part, 40: upper mold, 42: middle mold , 44:
Lower die, 65: cavity on the main stopper portion side, 66: cavity on the arm portion side, 70: rubber parting portion, 72: rubber reservoir portion

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29K 21:00 B29L 31:00

Claims (5)

[Claims] 1. An inner metal fitting, an outer metal fitting arranged at an interval outside the inner metal fitting, a rubber arm connecting the two metal fittings, and a space formed between the arm and the outer metal fitting. A rubber main stopper portion protruding in the main vibration input direction to be subjected to vibration damping from the outer metal fitting side into the inside, and the composition and / or physical properties or both of the rubber constituting the main stopper portion and the arm portion side are mutually In a method of manufacturing a different type of rubber composite vibration isolator, a mold is provided with two systems of runners including a runner on an arm portion side for forming an arm portion and a main stopper portion runner for forming a main stopper portion. The above-mentioned different kinds of rubber are injected from the runner on the arm portion side and the runner on the main stopper portion side, and are fused and connected to the rubber on the arm portion side at both ends along the outer fitting of the main stopper portion. A method for manufacturing a different type of rubber composite vibration isolator, wherein a portion is formed on a main stopper portion side. 2. A main stopper portion-side cavity for forming a main stopper portion and an arm portion-side cavity for forming an arm portion, wherein different cavities are injected into the respective cavities. 2. The method for manufacturing a heterogeneous rubber composite vibration isolator according to claim 1, wherein the injection time of the heterogeneous rubber into each of the cavities is shifted so that a part of the side rubber wraps into the cavity on the main stopper portion side. 3. The vibration isolator according to claim 1, wherein the amount of rubber injected into the main stopper portion side cavity for forming the main stopper portion is smaller than the capacity of the main stopper portion side cavity. Equipment manufacturing method. 4. An inner metal fitting, an outer metal fitting arranged outside the outer metal fitting, a rubber arm connecting the two metal fittings, and a space formed between the arm and the outer metal fitting. A rubber main stopper portion protruding in the main vibration input direction to be subjected to vibration damping from the outer metal fitting side into the inside, and the composition and / or physical properties or both of the rubber constituting the main stopper portion and the arm portion side are mutually In a method of manufacturing a different type of rubber composite vibration isolator, a mold is provided with two systems of runners including a runner on an arm portion side for forming an arm portion and a main stopper portion runner for forming a main stopper portion. The different types of rubber are injected from the runners on the arm portion side and the main stopper portion side, and a rubber reservoir is formed at a connection portion between the rubber on the arm portion side and the rubber on the main stopper portion side along the outer metal fitting. A method for producing a heterogeneous rubber composite vibration damping device, characterized in that: 5. The method of manufacturing a composite rubber vibration isolator according to claim 1, wherein the rubber of the main stopper is made of rubber having a higher hardness than the rubber of the arm.