JPH10113932A - Manufacture of different kind rubber composite vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a different hardness composite vibration insulating rubber in one process. SOLUTION: An inner fitment 2 and an outer fitment 4 are put into a mold with runners of two systems, and parting components 7 are disposed at some intervals in the vicinity of the outer fitment 4 connected with the inner fitment 2, and a low hardness rubber material is injected from a runner on the arm section side, while a high hardness rubber material is injected from a runner on the main stopper side. A low hardness arm section 6, a high hardness main stopper section 10 and peripheral rubber 22 connected with edge rubber 20 can be formed simultaneously by the arrangement, and a low hardness rubber section is integrated with a high hardness rubber section through the parting components 7. At the time, rubbers of two different kinds having different harness are separated across the parting components 7 and not mixed each other. The positions of rubber connecting sections of two different kinds having different hardness, therefore, can be determined by the parting components 7, and the composite molding of different hardness rubbers can be completed in one process by the arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This application relates to a method of manufacturing a composite rubber vibration isolator used for an engine mount or a suspension bush.

[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 rubber is manufactured by injecting a uniform rubber having an arm portion and a main stopper portion into a common mold by injection or the like. 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.

Accordingly, an object of the present invention is to provide a method for manufacturing a vibration isolator in which rubber of an arm portion and a main stopper portion is a combination of different types of rubber having different physical properties such as hardness and the like in a single step.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an inner metal fitting, an outer metal fitting arranged at an outer side of the inner metal fitting, a rubber arm connecting between these two metal fittings, A main stopper made of rubber protruding from the side of the outer fitting along the input direction of the main vibration to be damped into the closed space formed between the arm and the outer fitting, and constituting the arm; In a method of manufacturing a vibration isolator comprising a combination of rubber and different rubbers having different compositions or properties of a rubber constituting a main stopper portion, a mold provided with two systems of runners comprising an arm portion side runner and a main stopper portion runner. A partition member is arranged at a connection portion between the arm portion and the outer metal fitting in the mold, and rubber having a low hardness is injected from the runner on the arm portion side to form the arm portion integrally with the inner metal fitting, and simultaneously, Metal fittings To form the main stopper part in the body, characterized in that to prevent contamination of the rubber of the arm portion and the main stopper part side by the partition member.

At this time, the different kinds of rubbers are combined with different hardness rubbers so that the hardness of the rubber forming the arm portion is lower than that of the main stopper portion and the hardness of the rubber forming the main stopper portion is higher than that of the arm portion. Can also.

[0008]

According to the present invention, when a partition member is arranged in the mold near the outer metal fitting and different kinds of rubber are injected into the inner metal fitting and the outer metal fitting, respectively, the two rubbers form the arm portion and the main stopper portion, respectively. The rubber on the arm portion side and the rubber on the main stopper portion side are connected via the member, and both are not mixed. Therefore, a vibration isolator made of a combination of different types of rubber can be manufactured in a single step, and the design characteristics of the arm and the main stopper can be accurately realized.

At this time, if the different types of rubber are combined with different hardness rubbers, the hardness of the rubber forming the arm portion is lower than that of the main stopper portion, and the hardness of the rubber forming the main stopper portion is higher than that of the arm portion. Since a composite vibration isolator of different hardness rubber can be easily manufactured, and the hardness of the arm portion can be relatively low, tuning is facilitated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment constructed as an engine mount, which is a kind of vibration-proof rubber, will be described with reference to FIGS. FIG. 1 is a front view thereof, and FIG.
FIG. 3 is a sectional view taken along line 2 of FIG.

As shown in FIGS. 1 and 2, the engine mount includes 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 and a partition member 7 provided in the vicinity of the outer fitting 4 of the arm 6, and a main member protruding from the outer fitting 4 to a closed space 8 surrounded by the arm 6 and the outer fitting 4. And a stopper portion 10.

The arm portion 6 extends in a substantially C-shape to the left and right with the inner metal fitting 2 as a center. The connecting portion 12 of the arm portion with the partition member 7 has an R-shape, and the central portion has an arm projecting upward. It has a section stopper 14. The main stopper 10 and the arm stopper 14 protrude upward in the drawing along the input direction X of the main vibration.

The material forming the arm portion 6 is a rubber material having a lower hardness than the main stopper portion 10, for example, a hardness of 45 to 65.
It is made of NR rubber of about Hs.

A closed space 16 is also formed between the upper part of the arm 6 and the outer fitting 4, and an edge rubber formed around the outer fitting 4 is provided on both sides of the arm stopper 14 in the closed space 16. An auxiliary stopper 18 is formed integrally with the projection 20.

The edge rubber 20 is continuous with the main stopper 10, and forms a peripheral rubber 22 as a whole, and is made of a rubber material having a hardness higher than that of the arm 6, for example, having a hardness of 50 to 50.
It is made of an NR rubber material of about 75 Hs, and is separated from the arm 6 by a partition member 7.

As is apparent from FIG. 2, the partition member 7 is located near the outer metal fitting 4 and is bonded to the end of the arm 6 and the edge rubber 20.

Reference numerals 24 and 26 in the drawing denote injection gates on the arm portion, and reference numerals 28, 30 and 32 denote injection gates on the side of the peripheral rubber 22. 28 is located at the center of the main stopper 10, and 30 and 32 are located at the left and right auxiliary stoppers 18.

To manufacture the vibration-isolating rubber of this embodiment, FIG.
As is apparent from FIG. 3, the inner metal fitting 2 and the outer metal fitting 4 are put into the molding space formed between the upper mold 34, the middle metal mold 36, and the lower mold 38, and slightly near the outer metal fitting 4 connected to the inner metal fitting 2. The partition members 7 are arranged at intervals.

Subsequently, a rubber material having a lower hardness than the main stopper portion 10 is injected from one system of runners continuous with the injection gates 24 and 26, and the injection gates 28 to 32 have a higher hardness than the arm portion 6. Inject rubber material.

Thus, the low-hardness arm portion 6 and the high-hardness peripheral rubber 22 in which the main stopper portion 10 and the edge rubber 20 are continuous are simultaneously formed, and the low-hardness portion and the high-hardness portion are separated from each other. They are integrated via the member 7.

However, the rubber on the side of the arm 6 and the rubber on the side of the peripheral rubber 22 are separated with the partition member 7 interposed therebetween, and do not mix with each other.

As described above, according to the present embodiment, the provision of the partition member 7 can prevent the mixing of rubber on both the arm portion 6 and the peripheral rubber 22 side. The connection portion of the two types of rubber can be determined, and the hardness of each portion can be accurately obtained.

Therefore, composite molding with different hardness can be performed in a single step using a common mold, molding can be performed without increasing mold cost and manufacturing man-hours, and quality control accompanying mold replacement is difficult. You don't have to.

Further, since a composite structure in which the arm portion 6 and the peripheral rubber 22 have different hardness is obtained, the hardness of the arm portion 6 and the hardness of the main stopper portion 10 can be changed arbitrarily, and the arm Tuning of the resonance frequency of the unit 6 becomes possible. Further, it is possible to tune the spring ratio in the up, down, front, rear, left and right directions.

An engine mount according to a second embodiment will be described with reference to FIG. The engine mount includes a substantially V-shaped inner fitting 2, an outer fitting 4 surrounding the inner fitting 2 in a substantially semicircular shape with an interval therebetween, an arm portion 6 connecting the inner fitting 2 and the outer fitting 4, and an arm. The arm 6 includes a main stopper 10 projecting from the outer fitting 4 into a closed space 8 surrounded by the outer fitting 4 and the arm 6. I have.

The main stopper 10 is formed continuously and integrally as a part of the outer rubber 40 formed along the outer metal fitting 4. The hardness of the arm 6 is lower than that of the main stopper 10, and conversely, The outer rubber 40 including the main stopper 10 has a higher hardness than the arm 6, and the rubber having different hardness is partitioned by the partition member 7.

Since the partition member 7 is disposed in a direction substantially perpendicular to the length direction of the arm portion 6 extending obliquely upward, in addition to the effect of the previous embodiment, the shearing force applied to the arm portion 6 is increased. Stress can be relieved and durability can be improved.

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.
In this case, it is possible to combine the arm portion with low hardness and the main stopper portion with high hardness, or the combination of the opposite arm portion with high hardness and the main stopper portion with low hardness. In addition, the materials used are not only the same materials but also different physical properties of the same series (for example,
Damping properties) It can be a combination of materials. Further, a combination of the same hardness having different damping characteristics and the like is also possible.

Further, as the injection method, a general injection method under normal pressure, vacuum press or the like can be adopted, instead of injection. Further, the shapes of the inner metal fitting and the outer metal fitting can be variously modified such as a cylindrical shape.

Further, the present invention can be applied not only to the engine mount but also to a suspension bush. FIG. 5 shows a third embodiment in which the present invention is applied to a bush type vibration isolating rubber which is a bush type vibration isolator. The vibration rubber shows its cross section. Also in this example, the inner cylinder 102 corresponding to the inner metal fitting and the outer cylinder 104 corresponding to the outer metal fitting are arranged concentrically, and the arm part 106 and the main stopper part 110 are provided.

The arm 106 extends radially to the left and right with the inner cylinder 102 interposed therebetween, and is connected to a position facing the outer cylinder 104.
A closed space 108 is formed between the arm portion 106 and each of the main stopper portions 110, and a closed space 108 is formed in the closed space 108 from a portion near the arm portion 106 toward each of the main stopper portions 110. An arm portion stopper 114 is formed so as to protrude.

The arm 106 and the main stopper 11
Numerals 0 are made of different hardness materials, and these different hardness materials are partitioned by a concentric arc-shaped partition member 107 provided near the outer cylinder 104 of the arm portion 106. In addition,
An edge rubber 120 is formed between the partition member 107 and the inner peripheral surface of the outer cylinder 104, and the edge rubber 120 is made of the same material as the main stopper 110.

This bush-type anti-vibration rubber can be molded in the same manner as in the above-described embodiment. As a result, the same effect can be obtained even in the bush-type rubber according to this embodiment.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line 1-2 of FIG.

FIG. 3 is a sectional view taken along line 1-3 in FIG. 1;

FIG. 4 is a front view of a second embodiment.

FIG. 5 is a cross-sectional view of the third embodiment.

[Explanation of symbols]

2: Inside fitting, 4: Outside fitting, 6: Arm part, 7: Partition member, 8: Closed space, 10: Main stopper part, 22: Peripheral rubber

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 31:00

Claims (2)

[Claims] 1. An inner metal fitting, an outer metal fitting provided at an interval outside the inner metal fitting, a rubber arm connecting the two metal fittings, and a closing member formed between the arm and the outer metal fitting. A rubber main stopper portion protruding from the outer bracket side along the input direction of the main vibration to be damped into the space, and the composition or physical properties of the rubber forming the arm portion and the rubber forming the main stopper portion In a method of manufacturing a vibration damping device using a combination of different rubbers having different types, a mold provided with two systems of runners including an arm portion side runner and a main stopper portion runner is provided, and an arm portion and an outer metal fitting in the mold are provided. A partition member is arranged at the connection part with the inner part, and a low hardness rubber is injected from the arm part side runner to form the arm part integrally with the inner metal part, and at the same time, the main stopper part is formed integrally with the outer metal part, and the partition part is formed. Element A method for manufacturing a different kind of rubber composite vibration isolator, wherein mixing of each rubber on an arm portion side and a main stopper portion side is prevented. 2. The method according to claim 1, wherein the different rubber comprises a combination of different hardness rubbers, wherein the hardness of the rubber forming the arm portion is lower than that of the main stopper portion, and the hardness of the rubber forming the main stopper portion is higher than that of the arm portion. The method for producing a heterogeneous rubber composite vibration isolator according to claim 1, wherein: