JPH0914348A - Vibration control device - Google Patents

Abstract

PURPOSE: To provide a vibration control device of low cost and of good durability by integrally forming a spring member made of rubber material which is disposed between an inner cylinder and an outer cylinder and a mass member made of elastic material which are connected to the inner cylinder and the outer cylinder via the spring member and is formed into a cylinder shape. CONSTITUTION: A vibration control device 10 has an outer cylinder 12 of vibration receiving part and an inner cylinder 16 is arranged in the outer cylinder 12 in parallel to the outer cylinder 12 and is connected to a vibration generating part. A vulcanized spring member 14 is arranged between the inner cylinder 16 and the outer cylinder 12 on the outer peripheral surface of the inner cylinder 16 and on the inner circumferential surface of the outer cylinder 12. The spring member 14 comprises a spring member 14A of the inner cylinder side vulcanized to the inner cylinder 16, a recessed part 14C, and a spring member 14B of the outer cylinder side vulcanized to the outer cylinder 12. A mass member 18 made of elastic material which is connected to the inner cylinder 16 and the outer cylinder 12 via the spring member 14 and is formed into a cylinder shape is disposed so that it is sandwiched by the recessed part 14C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device that prevents transmission of vibrations from a member that generates vibrations, and is applicable to, for example, a bush or the like for reducing vibrations of a transmission.

[0002]

2. Description of the Related Art Conventionally, an anti-vibration device for elastically supporting the transmission has been arranged between the transmission serving as a transmission for changing the rotation of an engine and the vehicle body. The vibration isolator absorbs vibrations such as gear noises generated in the vehicle and prevents the vibrations from being transmitted to the vehicle body.

For example, a mass member 118 as shown in FIG.
The anti-vibration device 100 having the above has been used conventionally, and a conventional technique will be described below based on this anti-vibration device.

That is, as shown in FIG. 6, the gear noise of the transmission has a frequency in the range of about 400 to 600 Hz, whereas in the vibration isolator without the mass member 118, a spring member made of an elastic material, that is, a rubber member is used. 114
As shown by the alternate long and short dash line in FIG. 6, the dynamic spring constant K also tends to increase in proportion to the frequency.

Therefore, as shown in FIG.
By adding a flat plate-shaped metal mass member 118 having a predetermined mass to the spring member 114 connecting between the inner cylinder 116 and the inner cylinder 116, the post-resonance dynamic spring constant K is sufficient as shown by the solid line in FIG. By matching the lowered frequency range with the frequency range of gear noise of the transmission, a high vibration isolation effect was obtained.

[0006]

However, in the prior art, as shown in FIG.
As shown in FIG. 3, a large number of parts are required for the mass member 118 made of metal, and the surface of the mass member 118 for vulcanizing and adhering the mass member 118 to the spring member 114 in manufacturing such a vibration isolator. Therefore, an adhesive treatment such as application of an adhesive is required, which has been a cause of increasing the manufacturing cost of the vibration isolator.

Further, due to the deformation of the spring member 114 due to the absorption of vibration, the edges and corners 118A of the mass member 118 are
However, the spring member 114 itself and the stopper member 120 for softening the collision of the inner cylinder are repeatedly contacted with the spring member 1 repeatedly.
14 and the stopper member 120 may be damaged.

The present invention has been made in view of the above-mentioned reasons, and an object thereof is to obtain an anti-vibration device of low cost and high durability.

[0009]

A vibration-damping device according to a first aspect of the present invention is a cylindrical outer cylinder connected to one of a vibration generator and a vibration receiver, and is arranged inside the outer cylinder. In addition, a cylindrical inner cylinder connected to the other of the vibration generator and the vibration receiver, a spring member made of an elastic material interposed between the inner cylinder and the outer cylinder, and the spring member. And a mass member made of an elastic material, which is connected to the inner cylinder and the outer cylinder via a cylindrical member and is formed in a cylindrical shape, and the spring member and the mass member are integrally molded.

According to a second aspect of the present invention, the inner cylinder is made of an elastic material, and the inner cylinder, the spring member and the mass member are integrally formed.

According to a third aspect of the present invention, in the vibration isolator, the spring member has a constricted portion having an axial width that is considerably smaller than the axial width of the mass member.

A vibration isolator according to a fourth aspect of the present invention has a plurality of through holes provided between the outer cylinder and the mass member.

A vibration isolator according to a fifth aspect of the present invention has a plurality of through holes provided between the inner cylinder and the mass member.

According to a sixth aspect of the present invention, there is provided a vibration isolator comprising: a first mounting member connected to one of the vibration generating section and the vibration receiving section; and a second mounting member connected to one of the vibration generating section and the vibration receiving section. A member, a mass member made of an elastic material arranged between the first mounting member and the second mounting member, and the mass member each of the first mounting member and the second mounting member. And a spring member made of an elastic material that is connected to, and a predetermined spring-mass resonance system is formed by the spring member and the mass member.

[0015]

According to the operation of the vibration isolator according to claim 1, when the vibration generating portion generates vibration, the vibration is transmitted to the spring member through the outer cylinder or the inner cylinder, and the vibration is generated by the deformation of the spring member. Vibration is less likely to be transmitted to the vibration receiving portion side that is absorbed and connected to the inner cylinder or the outer cylinder.

At this time, by forming a predetermined spring-mass resonance system with the mass member and the spring member in the frequency range in which the dynamic spring constant increases according to the dynamic magnification of the spring member, the spring lowers after resonance. For example, the frequency range of gear noise of the transmission is matched with the frequency range, and the vibration of the frequency range of the gear noise is absorbed by the spring member so that it is difficult to transmit the vibration of this frequency range to the vibration receiving portion side.

Further, when manufacturing the vibration damping device of the present invention, since the spring member and the mass member are made of an elastic material and made of the same material and can be integrally molded, they are bonded to the spring member. Therefore, the adhesion processing to the mass member becomes unnecessary, the productivity is improved, and the mass member made of other material such as metal is not required separately, the number of parts is reduced, and the manufacturing cost is reduced. Further, since the mass member made of an elastic material is connected to the inner cylinder and the outer cylinder via the spring member and is formed in a cylindrical shape so as to have a large volume, the mass member may damage the spring member. Therefore, the durability of the anti-vibration device can be achieved.

The operation of the vibration isolator according to claim 2 is as follows.
When manufacturing the vibration damping device of the present invention, if the inner cylinder, the spring member, and the mass member are made of an elastic material and integrally molded at the same time, the inner cylinder and the mass member for adhering to the spring member Since the adhesion process to the substrate is not required, the productivity is improved, the mass member and the inner cylinder made of other material such as metal are not separately required, and the number of parts is greatly reduced, and the manufacturing cost is reduced.

The operation of the vibration isolator according to claim 3 is as follows.
If the spring member is provided with a constricted portion having an axial width that is considerably smaller than the axial width of the mass member, the volume of the mass member can be substantially increased, and thus the mass of the mass can be increased. The elastic material, which is lighter than metal, can be easily applied as the mass member.

The operation of the vibration isolator according to claim 4 is as follows.
Dynamic spring constant K of the spring member in the predetermined direction of the inner cylinder or the outer cylinder
When it is desired to reduce the number, it is possible to easily reduce the number by providing a plurality of through holes between the outer cylinder and the mass member in correspondence with the predetermined direction.

The operation of the vibration isolator according to claim 5 is as follows.
Similarly to claim 4, when it is desired to reduce the dynamic spring constant K of the spring member in a predetermined direction of the inner cylinder or the outer cylinder, a plurality of through holes are provided between the inner cylinder and the mass member in correspondence with the predetermined direction. It can be easily reduced by providing.

The operation of the vibration isolator according to claim 6 is as follows.
When the vibration generating part generates vibration, it is connected to one of the vibration generating part and the vibration receiving part through the first mounting member or the second mounting member connected to one of the vibration generating part and the vibration receiving part. The vibration is transmitted to the spring member, the vibration is absorbed by the deformation of the spring member, and the vibration is less likely to be transmitted to the vibration receiving portion side connected to the second mounting member or the first mounting member.

At this time, the frequency range in which the dynamic spring constant rises due to the surging of the spring member constitutes a predetermined spring-mass resonance system with the mass member and the spring member, so that, for example, the frequency range of gear noise of the transmission is set. It is changed to a deviated low frequency range, and the vibration of the gear noise in the frequency range is absorbed by the spring member, so that it is difficult to transmit the vibration in the frequency range to the vibration receiving portion side.

Further, when manufacturing the vibration damping device of the present invention, since the spring member and the mass member are made of an elastic material and made of the same material and can be integrally molded, they are bonded to the spring member. Therefore, the adhesion processing to the mass member becomes unnecessary, the productivity is improved, and the mass member made of other material such as metal is not required separately, the number of parts is reduced, and the manufacturing cost is reduced. Further, since the mass member made of an elastic material is provided which is connected to the second mounting member and the first mounting member via the spring member and has a cylindrical shape so as to provide a large volume, the mass member is a spring. The durability of the anti-vibration device can be achieved without damaging the members.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which a vibration damping device according to the present invention is applied to a bush type vibration damping device arranged between a transmission and a vehicle body is shown in FIGS. 1 (a) and 1 (b). This embodiment will be described based on these drawings.

As shown in FIGS. 1 (a) and 1 (b),
The vibration isolator 10 according to the present embodiment is provided with an outer cylinder 12 as a first mounting member that is formed into a cylindrical shape and is press-fitted into a vehicle body (not shown) that is a vibration receiving portion.

Inside the outer cylinder 12, an inner cylinder 16 which is a metal second mounting member formed in a cylindrical shape is arranged in parallel with the outer cylinder 12, and the inner cylinder 16 vibrates. It has a structure in which it is connected to a part of a transmission (not shown) which is a generator by bolts (not shown).

Further, between the inner cylinder 16 and the outer cylinder 12, there are disposed rubber spring members 14 vulcanized and bonded to the outer peripheral surface of the inner cylinder 16 and the inner peripheral surface of the outer cylinder 12, respectively. . The spring member 14 includes an inner cylinder side spring member 14A vulcanized and bonded to the inner cylinder 16, a constricted portion 14C described later, and an outer cylinder side spring member 14B vulcanized and bonded to the outer cylinder 12 at three positions. It is composed of members. The spring members 14A and 14B have an axial width that is considerably smaller than the axial widths of the bonding surfaces that are vulcanized and bonded to the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder of the inner cylinder side spring member 14A and the outer cylinder side spring member 14B. It has a constricted portion 14C. Further, a mass member 18 made of an elastic material, which is connected to the inner cylinder 16 and the outer cylinder 12 via the spring member 14 and is formed into a cylindrical shape, is provided so as to be sandwiched between the constricted portions 14C.

The method of manufacturing the vibration damping device of this embodiment will be described. First, the inner cylinder 16 and the outer cylinder 12 are placed in a mold (not shown), and the inner cylinder 16 and the outer cylinder are vulcanized by vulcanizing the rubber. The vibration damping device 10 in which the rubber spring member 14 and the mass member 18 are integrally molded is formed between the vibration damping device 10 and the rubber member 12. In addition,
When manufactured by such a method, the rubber contracts after vulcanization and contraction residual strain occurs in the spring member.
It is conceivable that the outer cylinder 12 is subjected to a drawing process in the final manufacturing step of No. 0 to remove the residual shrinkage of shrinkage and further give the compressive strain to the spring member 14 to improve the durability of the spring member.

The operation of this embodiment will be described below. As described above, when an elastic material such as rubber having a specific gravity smaller than that of metal is used as the mass member, it is possible to sufficiently increase the volume of the mass by forming the mass into a tubular shape as in this embodiment. it can. Furthermore, it is possible to provide the mass member with an elastic body that is an equivalent material used for the spring member,
As a result, the spring member and the mass member can be integrally formed. When the engine of the vehicle rotates and this rotation is transmitted to the transmission, gears in the transmission mesh with each other to generate vibration. Then, this vibration is transmitted from the transmission to the spring member 14 via the inner cylinder 16. The spring member 14 acts as an absorption main body, absorbs the vibration by the damping function based on the internal friction of the spring member 14, and makes it difficult to transmit the vibration to the vehicle body side.

At this time, the frequency range in which the dynamic spring constant K after the resonance of the spring member 14 decreases is matched with the frequency range of 400 to 600 Hz which is the frequency range of gear noise of the transmission, and the frequency range of this gear noise is The spring member 14 absorbs the vibration to make it difficult to transmit the vibration in this frequency range to the vehicle body side.

A second embodiment according to the present invention is shown in FIGS. 2 (a) and 2 (b), and this embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIGS. 2 (a) and 2 (b),
The spring member 14 is composed of an inner cylinder side spring member 14A that is vulcanized and bonded to the inner cylinder 16, a constricted portion 14C, and an outer cylinder side spring member 14B that is vulcanized and bonded to the outer cylinder 12. Configured. Further, a mass member 18 made of an elastic material, which is connected to the inner cylinder 16 and the outer cylinder 12 via the spring member 14 and is formed into a cylindrical shape, is provided so as to be sandwiched between the constricted portions 14C. Further, the outer cylinder side spring member 14B is provided with a spring member expanded portion 14D in which both ends thereof are expanded in the direction directly outside the axis.

The method of manufacturing the vibration isolator of this embodiment will be described. First, the inner cylinder 16 is placed in a mold (not shown),
By vulcanizing the rubber, the vibration damping device intermediate member 10A in which the rubber spring member 14 and the mass member 18 are integrally formed in the inner cylinder 16 is formed. Next, the external cylinder 1 prepared separately
The vibration damping device 10 is obtained by press-fitting the above-mentioned vibration damping device intermediate member 10A. It should be noted that both ends of the outer cylinder 12 are provided with an outer cylinder expanded portion 12A that is expanded by bending in the axially outward direction, and the outer cylinder side spring member 14B is fitted to the outer cylinder 12 so as to straddle the outer cylinder 12. Therefore, the spring member expanded portion 14D and the outer cylinder expanded portion 1
It is possible to prevent the spring member 14 from coming off the outer cylinder 12 due to interference with 2A.

A third embodiment according to the present invention is shown in FIGS. 3 (a) and 3 (b), and this embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIGS. 3 (a) and 3 (b),
The spring member 14 is composed of an inner cylinder side spring member 14A that is vulcanized and bonded to the inner cylinder 16, a constricted portion 14C, and an outer cylinder side spring member 14B that is vulcanized and bonded to the outer cylinder 12. Configured. Furthermore, the inner cylinder 16 is made of rubber and is formed integrally with the inner cylinder side spring member 14A. Also, the spring member 1
The mass member 18 made of an elastic material, which is connected to the inner cylinder 16 and the outer cylinder 12 via 4 and is formed in a cylindrical shape, has a constricted portion 14C.
It is provided so as to be sandwiched between. Further, the outer cylinder side spring member 14B is provided with a spring member expanded portion 14D in which both ends thereof are expanded in the direction directly outside the axis. That is, the inner cylinder 16
The spring member 14 and the mass member 18 are integrally formed of the same rubber by vulcanizing rubber in a mold to form the vibration isolator intermediate member 10A. Next, the outer cylinder 12 prepared separately
When the previous vibration isolator intermediate member 10A is press-fitted into the
0 is obtained. Therefore, it is not necessary to separately form the inner cylinder with a material other than rubber such as metal, and the number of members can be reduced. In addition, both ends of the outer cylinder 12 are provided with outer cylinder expanded portions 12 </ b> A that are bent outward in the axial direction and expanded in diameter.
Since 4B is fitted into the outer cylinder 12 so as to straddle the outer cylinder 12, the spring member expanded portion 14D and the outer cylinder expanded portion 12A interfere with each other to prevent the spring member 14 from falling off the outer cylinder 12. can do.

A fourth embodiment according to the present invention is shown in FIGS. 4 (a) and 4 (b), and this embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

An inner cylinder 16 is provided between the inner cylinder 16 and the outer cylinder 12.
A rubber spring member 14 vulcanized and bonded is arranged on each of the outer peripheral surface and the inner peripheral surface of the outer cylinder 12. Spring member 1
4 is an inner cylinder side spring member 14A that is vulcanized and bonded to the inner cylinder 16.
And a constricted portion 14C and an outer cylinder side spring member 14B that is vulcanized and bonded to the outer cylinder 12 at three positions.
Further, the mass member 1 made of an elastic material is connected to the inner cylinder 16 and the outer cylinder 12 via the spring member 14 and is formed in a cylindrical shape.
8 are provided. The inner cylinder side spring member 14A and / or the outer cylinder side spring member 14B has a constricted portion 14C, and the outer cylinder 1
6 and a plurality of through holes 20 penetrating in the axial direction of the inner cylinder 12 are provided. Therefore, by providing the inner cylinder side spring member 14A and / or the outer cylinder side spring member 14B with the appropriate number and size of the through holes 20 in the direction in which the inner cylinder or the outer cylinder is displaced, the spring member can be obtained. It becomes easy to reduce the dynamic spring constant K of 14.

[0039]

Since the vibration isolator according to the present invention is constructed as described above, it is possible to provide a vibration isolator with low cost and high durability.

[Brief description of the drawings]

FIG. 1A is a front view of a vibration isolation device according to a first embodiment of the present invention. (B) It is an AA arrow line sectional view of the anti-vibration device concerning the 1st example of the present invention.

FIG. 2A is a front view of a vibration isolator according to a second embodiment of the present invention. (B) It is the sectional view on the AA arrow line of the vibration isolator which concerns on 2nd Example of this invention.

FIG. 3 (a) is a front view of a vibration damping device according to a third embodiment of the present invention. (B) It is an AA arrow sectional view of the vibration isolator which concerns on 3rd Example of this invention.

FIG. 4 (a) is a front view of a vibration damping device according to a fourth embodiment of the present invention. (B) It is the sectional view on the AA arrow line of the vibration isolator which concerns on 4th Example of this invention.

FIG. 5 is an external perspective view of a conventional vibration damping device.

FIG. 6 is a diagram showing a graph showing a vibration damping characteristic of a conventional vibration damping device.

[Explanation of symbols]

 10, 100 Vibration isolation device 10A Vibration isolation device intermediate member 12, 112 Outer cylinder 12A Outer cylinder expanded portion 14, 114 Spring member 14A Inner cylinder side spring member 14B Outer cylinder side spring member 14C Constricted portion 14D Spring member expanded diameter Parts 16, 116 Inner cylinder 18, 118 Mass member 20 Through hole 118A Corner 120 Stopper member

Claims (6)

[Claims] 1. A cylindrical outer cylinder connected to one of the vibration generator and the vibration receiver, and an inner cylinder arranged inside the outer cylinder and connected to the other of the vibration generator and the vibration receiver. An inner cylinder formed in a tubular shape, a spring member made of an elastic material interposed between the inner cylinder and the outer cylinder, and a cylinder connected to the inner cylinder and the outer cylinder via the spring member. And a mass member made of an elastic material formed into a shape, and the spring member and the mass member are integrally molded. 2. The vibration isolator according to claim 1, wherein the inner cylinder is made of an elastic material, and the inner cylinder, the spring member, and the mass member are integrally molded. 3. The vibration isolator according to claim 1, wherein the spring member includes a constricted portion having an axial width that is considerably smaller than the axial width of the mass member. 4. The vibration isolator according to claim 1, wherein a plurality of through holes are provided between the outer cylinder and the mass member. 5. The vibration isolator according to claim 1, wherein a plurality of through holes are provided between the inner cylinder and the mass member. 6. A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to one of the vibration generating portion and the vibration receiving portion, and the first mounting member. A mass member made of an elastic material arranged between a member and the second mounting member, and a spring made of an elastic material connecting the mass member to each of the first mounting member and the second mounting member. A vibration damping device, comprising: a member, wherein a predetermined spring-mass resonance system is formed by the spring member and the mass member.