JPH084825A - Cylindrical rubber vibration isolator device - Google Patents

Abstract

PURPOSE:To realize a rubber vibration isolator device also having even damping characteristics in addition to spring characteristics by a spring ring. CONSTITUTION:An elliptic spring ring 4 is arranged between an inner cylindrical body 1 and an outer cylindrical body 2. The inner cylindrical body 1 is connected to an upper part of the spring ring 4 by a first rubber elastic body 5, while a lower part of the spring ring 4 is connected to the outer cylindrical body 2 by a second rubber elastic body 6. The second rubber elastic body 6 is constituted of an upward- facing elastic body part 6a, a downward-facing elastic body part 6b and an outer peripheral side elastic body part 6c, and a main liquid chamber 9 with sealed liquid L therein is defined from the upward-facing elastic body part 6a to the downward- facing elastic body part 6b. Auxiliary liquid chambers 10, 10 are expandably/ contractibly defined by rubber thin films 6f, 6f in the outer peripheral side elastic body part 6c and communicated with the main liquid chamber 9 via orifices 11, 11. The main liquid chamber is defined by a rubber partition wall 6e at a position opposing to the inner cylindrical body of the upward-facing elastic body part 6a in the vertical direction. The inner cylindrical body 1 is brought into contact with an upper surface of the rubber partition wall 6e and by downward displacement of the inner cylindrical body 1, liquid flow via the orifices 11, 11 is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for vibration-proofing applications such as engine mounts of automobiles, in which an inner cylinder and an outer cylinder are connected to each other via a rubber elastic body and an annular spring body. The present invention relates to a cylindrical anti-vibration rubber device.

[0002]

2. Description of the Related Art Conventionally, as a cylindrical vibration damping rubber device of this type, a lower part of an elliptical spring ring is elastically connected to a lower inner peripheral surface of an outer cylindrical body, and a spring ring is formed from an upper part of the spring ring. It is known that a rubber elastic body extending downward inward is formed, and a through hole for connection is formed in this rubber elastic body (see, for example, JP-A-3-172636).

[0003]

However, in the above-mentioned conventional cylindrical vibration damping rubber device, the vibration damping characteristics of the rubber elastic body are mainly determined by the spring characteristics peculiar to the spring ring. In addition to being inferior to the comparison, there is a drawback that the attenuation performance in a specific frequency range cannot be obtained. On the other hand, the dynamic characteristic is insufficient especially in the high frequency region only by the liquid column resonance between the two liquid chambers through the orifice as in a so-called liquid sealing bush in which liquid is sealed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a vibration damping characteristic based on the spring characteristic of an annular spring body and at the same time, to obtain a damping characteristic in a specific frequency range. To secure it.

[0005]

In order to achieve the above object, the invention according to claim 1 is such that an inner cylindrical body is arranged so that a cylindrical axis extends in a substantially horizontal direction, and the inner cylindrical body is surrounded. And an outer cylinder body arranged, wherein the inner cylinder body is connected to one of the vibration source and the vibration receiving portion, and the outer cylinder body is connected to the other, respectively, and a space between the inner cylinder body and the outer cylinder body is provided. It is premised that the device is arranged so that the vibration is input in the vertical direction. In this structure, the annular spring body is provided between the outer cylinder body and the inner cylinder body so as to surround the inner cylinder body, and the upper portion is connected to the inner cylinder body. A rubber elastic body that connects the spring body and the outer cylinder body to each other is provided.
Arranged between the lower part of the spring body located below the inner cylinder and the upward elastic body projecting to the inner cylinder side, and extending downward from the lower part of the spring body to the peripheral surface of the outer cylinder body. And a downward elastic body portion. A main liquid chamber, in which a liquid is enclosed, is defined by a rubber partition formed inside the rubber elastic body at a portion of the upward elastic body portion that vertically opposes the inner cylinder, and the main liquid chamber. A chamber and an auxiliary liquid chamber which is communicated with each other through an orifice and is formed so as to be expandable and contractible, and the inner cylindrical body is moved relative to the rubber elastic body by a relative displacement of the inner cylindrical body downward due to vibration input. The rubber partition is arranged so as to press the rubber partition.

According to a second aspect of the present invention, in the first aspect of the invention, the main liquid chamber is formed by penetrating the spring body from the upward elastic body portion to the downward elastic body portion, and the upward elastic body portion has a rubber partition wall. To integrally form a downward convex portion protruding into the main liquid chamber. A limiting passage is formed between the outer peripheral surface of the downward convex portion and the inner peripheral surface of the main liquid chamber, and the limiting passage is tuned so as to correspond to a frequency range higher than the orifice. .

Further, the invention according to claim 3 is provided with an inner cylinder body arranged so that the cylinder axis extends in a substantially horizontal direction, and an outer cylinder body arranged so as to surround the inner cylinder body, The inner cylindrical body is connected to one of the vibration source and the vibration receiving portion, and the outer cylindrical body is connected to the other, so that vibration is vertically input between the inner cylindrical body and the outer cylindrical body. What is done is assumed. In this structure, an annular spring body is provided between the outer cylinder body and the inner cylinder body so as to surround the inner cylinder body and has an upper portion connected to the inner cylinder body. A rubber elastic body for connecting the spring body and the outer cylinder body to each other is provided, and the rubber elastic body is arranged so as to extend downward from the lower portion of the spring body to the inner peripheral surface of the outer cylinder body. It is composed of a downward elastic body portion and a lateral elastic body portion that extends laterally from the side portion of the spring body and is arranged between the inner peripheral surface of the outer cylindrical body. And a main liquid chamber, in which a liquid is enclosed, is defined between the side portion of the spring body and the outer cylindrical body so that the lateral elastic body portion of the rubber elastic body is expanded and contracted by the lateral displacement of the spring body. The main liquid chamber and an auxiliary liquid chamber that is formed to be expandable and contractible by communicating with each other through an orifice are provided.

Further, the invention according to claim 4 is the same as claim 1.
Alternatively, in the invention as set forth in claim 3, a rubber stopper portion is formed so as to project in the vertical direction from the spring body or the outer cylinder body to limit the upward displacement or the downward displacement of the inner cylinder body.

[0009]

According to the above-mentioned structure, according to the first aspect of the present invention,
When vertical vibration is input between the inner cylinder and the outer cylinder, the inner cylinder is relatively displaced downward and presses the rubber partition wall to deform the main liquid chamber, and the auxiliary liquid is deformed via the orifice. A liquid flows between the liquid chamber and the liquid chamber. The liquid flow causes the liquid column resonance between the main liquid chamber and the sub liquid chamber via the orifice to attenuate the input vibration in the specific frequency range. Moreover, while the inner cylinder is connected to the upper part of the annular spring body, the lower part of the spring body is connected to the outer cylinder through the downward elastic body portion of the rubber elastic body, so that Anti-vibration characteristics with a low static-dynamic ratio are obtained based on the spring characteristics,
Thereby, in addition to the damping characteristic due to the liquid column resonance, the dynamic characteristic is improved by the spring body.

According to the second aspect of the present invention, in addition to the function of the first aspect of the present invention, the limiting passage between the downward convex portion protruding from the rubber partition wall into the main liquid chamber and the peripheral surface of the main liquid chamber is formed. Since it is tuned to correspond to the vibration in the high frequency range from the orifice, even if the vibration on the high frequency side that causes a so-called clogging phenomenon that the flow of the liquid through the orifice is substantially stopped is input. The flow of the liquid through the restriction passage is generated in the main liquid chamber, and thus the vibration isolation characteristic against the vibration in the high frequency region is imparted.

According to the third aspect of the invention, when vertical vibration is input between the inner cylinder and the outer cylinder, the upper portion of the annular spring body is displaced downward so that the side portion of the spring body is displaced. Elastically deforms so that it bulges outward. Due to the lateral displacement of the side portion of the spring body, the main liquid chamber formed in the lateral elastic body portion is contracted and deformed, and the liquid inside flows through the orifice with the sub liquid chamber. The liquid flow causes the liquid column resonance between the main liquid chamber and the sub liquid chamber via the orifice to attenuate the input vibration of the specific frequency. Moreover,
2. The invention according to claim 1, wherein the inner cylinder is connected to the upper part of the annular spring body, while the lower part of the spring body is connected to the outer cylinder via the downward elastic body portion of the rubber elastic body. In the same manner as in the above case, a low static-dynamic ratio based on the spring characteristic of the spring body is obtained, and in addition to the damping characteristic due to the liquid column resonance, the dynamic characteristic is improved based on this low static-dynamic ratio. Also in this case,
Since the main liquid chamber is arranged in the horizontal direction, which is the vibration input direction with respect to the inner cylindrical body, rather than in the vertical direction, occurrence of excessive hydraulic pressure fluctuation is avoided as compared with the case according to the invention of claim 1. In addition to improving the durability, it is not necessary to set the vertical positional relationship between the inner cylindrical body and the downward elastic body portion to a specific one, thereby increasing the degree of freedom in design.

Further, according to the invention described in claim 4, in addition to the operation according to the invention described in claim 1 or 3, since the rubber stopper portion is formed, the inner cylindrical body at the time of the vertical vibration input is input. Relative displacement upward or downward is limited to a predetermined displacement amount based on the rubber stopper portion,
As a result, the amount of deformation of the spring body is limited within a predetermined elastic range, so that the durability of the spring body is improved and the reliability of vibration isolation is improved.

[0013]

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

<First Embodiment> FIGS. 1 and 2 show a cylindrical vibration-proof rubber device according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes an inner cylinder body arranged so that the cylinder axis X extends in a substantially horizontal direction, and is connected to, for example, an engine side as a vibration source by a bolt (not shown) inserted in the inner cylinder body 1. Has been done. Reference numeral 2 denotes an outer cylinder body arranged so as to surround the inner cylinder body 1. For example, as a vibration receiving portion, a bracket 3a fixed to the lower side of the outer cylinder body 2 and bolts 3b and 3b are used. It is connected to the vehicle body side, and vertical vibration is input between the inner cylinder body 1 and the outer cylinder body 2 from the engine side or the vehicle body side. Further, 4 is an endless spring ring as an annular spring body which is arranged between the inner cylindrical body 1 and the outer cylindrical body 2 so as to surround the inner cylindrical body 1. It should be noted that FIGS. 1 and 2 are in a state before being attached to the engine or the vehicle body side, and show an unloaded state in which no external force acts on the inner cylinder body 1 or the outer cylinder body 2.

The spring ring 4 is made of metal or synthetic resin such as fiber reinforced plastic in a cylindrical shape having an oval or elliptical cross section, and is arranged so as to be short in the vertical direction and long in the horizontal direction. ing. The upper part of the spring ring 4 and the outer peripheral surface of the inner cylindrical body 1 are connected to each other by the first rubber elastic body 5, while the lower part of the spring ring 4 and the lower inner peripheral surface of the outer cylindrical body 2 are connected to each other. Are connected to each other by a second rubber elastic body 6, and the inner cylindrical body 1 is eccentric to the outer cylindrical body 2 by a predetermined amount. Also, they are connected to the outer cylindrical body 2 via the second rubber elastic body 6 while being elastically supported.

The first rubber elastic body 5 extends downward from the inner peripheral surface of the upper portion of the spring ring 4 so that the cross-sectional shape thereof spreads in an inverted triangular shape, and extends over the entire outer peripheral surface of the inner cylindrical body 1. The first rubber elastic body 5 is integrally formed with a rubber stopper portion 5a protruding upward from the upper portion of the spring ring 4.

The second rubber elastic body 6 has an upward elastic body portion 6a projecting upward from the lower portion of the spring ring 4 toward the inner cylinder 1 side, and extends downward from the lower portion of the spring ring 4. It is composed of a downward elastic body portion 6b arranged up to the inner peripheral surface of the outer cylindrical body 2. And this second
The rubber coating layers 7 and 7 vulcanized and bonded to the inner and outer peripheral surfaces of the spring ring 4 so as to connect between the rubber elastic body 6 and the first rubber elastic body 5, respectively. 6 is formed integrally with each other, and the respective rubber coating layers 7 exhibit vibration damping characteristics in cooperation with the spring ring 4 itself. In addition, the outer cylindrical body 2 of the downward elastic body portion 6b.
An outer peripheral side elastic body portion 6c is integrally formed so as to extend continuously from the side along the outer peripheral surface of the outer cylindrical body 2 in the entire circumferential direction. A reinforcing cylindrical body 8 is embedded in the outer peripheral side elastic body portion 6c so as to be covered with a rubber layer 6d on the outer peripheral surface thereof, and the reinforcing cylindrical body 8 extends to the inner peripheral surface of the outer cylindrical body 2. It is designed to be reinforced during press-fitting and assembly.

Inside the second elastic body 6, a main liquid chamber 9 is formed in a sealed state from the upward elastic body portion 6a to the downward elastic body portion 6b, and the liquid L is stored in the main liquid chamber 9. It is enclosed. The upper portion of the main liquid chamber 9 is defined by a relatively thin rubber partition wall 6e formed in the upper surface side portion of the upward elastic body portion 6a, that is, in the portion facing the inner cylindrical body 1 in the vertical direction, Spring ring 4 and reinforcing cylinder 8
Through the respective through windows 4a and 8a, and the lower part is defined by the inner peripheral surface of the outer tubular body 2.

Further, through-hole windows 8b are formed on the upper part of the above-mentioned reinforcing cylinder 8 at both left and right positions with the rubber stopper portion 5a sandwiched therebetween, and the outer peripheral elasticity at the positions of both through-hole portions 8b, 8b. As shown in FIG. 3, the body portion 6c is formed with a pair of auxiliary liquid chambers 10, 10 which are defined by the rubber thin film 6f and the inner peripheral surface of the outer cylindrical body 2 and can be expanded and contracted. The pair of sub liquid chambers 10, 10 and the main liquid chamber 9 are
As shown in FIG. 4, a part of the rubber layer 6d is cut away in the circumferential direction so that the orifices 11 formed between the reinforcing cylinder 8 and the outer cylinder 2 communicate with each other.

In such a structure, the inner cylindrical body 1 is connected to the engine side and the outer cylindrical body 2 is connected to the vehicle body side, respectively. The above-mentioned spring ring 4 under the weight of the engine
The upper part of the inner cylinder 1 is displaced downward so that the inner cylindrical body 1 is in contact with the upper surface of the rubber partition wall 6e as shown in FIG.
The bending rigidity of the spring ring 4 is set.

Reference numeral 12 in FIG. 1 indicates the first in the spring ring 4.
A space that is formed between the rubber elastic body 5 and the second rubber elastic body 6 and penetrates in the cylinder axis X direction, and 13 is between the rubber coating layer 7 and the outer peripheral side elastic body portion 6c, that is, the spring ring 4. A space L formed between the outer cylinder body 2 and the outer cylinder body 2, penetrating in the cylinder axis X direction, is an incompressible liquid sealed in the main liquid chamber 9 and each sub liquid chamber 10.

Next, the operation and effect of the first embodiment having the above structure will be described.

When the inner cylinder 1 is connected to the engine and the outer cylinder 2 is connected to the vehicle body so that the lower part of the inner cylinder 1 is in contact with the upper surface of the rubber partition wall 6e, for example, the inner cylinder is When a vertical vibration is input to the engine 1 from the engine side, the inner cylindrical body 1 is relatively displaced downward and the rubber partition wall 6e.
By pressing, the main liquid chamber 9 is deformed, and the liquid L inside flows through the orifices 11, 11 to the sub liquid chambers 10, 10 side. Due to the flow of the liquid L, liquid column resonance between the main liquid chamber 9 and the sub liquid chambers 10 and 10 through the orifices 11 and 11 against vibration of a specific frequency based on the shape of the orifices 11 and 11. Occurs. Therefore, due to the liquid column resonance, it is possible to reduce the input vibration, particularly the input vibration of a specific frequency on the low frequency side. On the other hand, since the inner cylindrical body 1 is connected to the upper part of the spring ring 4 via the first rubber elastic body 5, the spring ring 4 is elastically deformed and vibrates in response to the input vibration to the inner cylindrical body 1. Since the absorption is achieved, the vibration can be achieved in the state where the static-dynamic ratio is suppressed to be low based on the spring characteristic of the spring ring 4. This allows
In addition to the damping characteristic due to the liquid column resonance, the dynamic characteristic can be improved based on this low static-dynamic ratio. In addition, when the spring ring 4 absorbs vibrations, since the rubber coating layers 7 and 7 are closely adhered to the inner and outer peripheral surfaces of the spring ring 4, the amplitude of the spring ring 4 itself is the rubber coating. It is suppressed by the layers 7, 7.

<Second Embodiment> FIGS. 6 and 7 show a cylindrical anti-vibration rubber device according to a second embodiment of the present invention.
The present invention relates to the described invention. In the figure, reference numeral 14 is a main liquid chamber, and 6g is a downward convex portion integrally projected from the predetermined central region of the rubber partition wall 6e of the second rubber elastic body 6 toward the main liquid chamber 14 side. 6 and 7, the inner cylindrical body 1 is connected to the engine side, and the outer cylindrical body 2 is connected to the vehicle body side. The inner cylindrical body 1 receives the weight of the engine and is displaced downward to move the upper surface of the rubber partition wall 6e. 2 shows a state in which the engine weight is supported at a position where it abuts against.

The main liquid chamber 14 is defined by a liquid chamber portion 14a between the lower end of the downwardly projecting portion 6g and the inner peripheral surface of the outer cylindrical body 2 and a volume changeable by the rubber partition wall 6e. Chamber 1
4b, the inner peripheral surface of the downward elastic body portion 6b, and the outer peripheral surface of the downward convex portion 6g.
It is composed of an annular restriction passage 14c which connects a and 14b to each other. Further, the cross-sectional shape and the length of the restriction passage 14c are such that both the liquid chamber portions 1 in the high frequency side frequency range where the orifices 11, 11 are clogged.
Tuning is set so that the liquid L can flow between 4a and 14b.

Since the other construction of the above-mentioned cylindrical vibration damping rubber device is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

Further, in the case of the second embodiment, the vibration is on the higher frequency side than the specific frequency range on the lower frequency side where the liquid column resonance occurs through each of the orifices 11, and each of the orifices 11 has a visual effect. Even if a vibration on the high frequency side that causes a clogging phenomenon is input, the downward displacement of the inner cylindrical body 1 causes the downward convex portion 6g to move up and down to reduce the liquid chamber portion 14a.
The reduced amount of the liquid L flows into the liquid chamber portion 14b through the restriction passage 14c, so that the rubber partition wall 6e swells,
In the main liquid chamber 14, the liquid L flows between the two liquid chamber portions 14a and 14b. Thus, when the vibration on the high frequency side is input, in addition to the vibration isolation by the spring ring 4, the flow rate of the liquid L in the main liquid chamber 14 reduces the vibration transmissibility to the outer cylinder body 2 side. be able to.

<Third Embodiment> FIGS. 8 and 9 show a cylindrical vibration damping rubber device according to a third embodiment of the present invention.
The present invention relates to the described invention. In the figure, reference numeral 15 denotes a first rubber elastic body that connects the outer peripheral surface of the inner tubular body 1 and the upper portion of the spring ring 4 to each other, and 16 denotes the lower portion and left and right side portions of the spring ring 4 and the outer tubular body 2, respectively. A second rubber elastic body that connects the inner peripheral surface to each other, 17 is a rubber coating layer that covers the inner peripheral surface of the spring ring 4 in close contact, and 18 is an outer peripheral elasticity of the second rubber elastic body 16 described later. Reinforcing cylinders embedded in the body portion 16c, 19 and 19 are main liquid chambers, and 20 is a sub liquid chamber.

The second rubber elastic body 16 extends downward from the lower portion of the spring ring 4 and is arranged between the inner peripheral surface of the outer cylindrical body 2 and the downward elastic body portion 16a, and the spring ring. The lateral elastic body portions 16b, 1 extending outward from the left and right side portions of the outer peripheral portion 4 and extending to the inner peripheral surface of the outer cylindrical body 2
6b, and an outer peripheral side elastic body portion 16c connecting the outer peripheral side portions of these elastic body portions 16a and 16b and extending in the circumferential direction. Then, the reinforcing cylindrical body 18 embedded in the outer peripheral side elastic body portion 16c is press-fitted into the inner peripheral surface of the outer cylindrical body 2 via the rubber layer 16d vulcanized and adhered to the outer peripheral side thereof.

The main liquid chambers 19 are defined in the lateral elastic body portions 16b in a sealed state, and the outer peripheral side rubber coating layer 17 of the spring ring 4 and the inner periphery of the outer cylindrical body 2 are formed. It is defined by a surface and is expanded and contracted by the lateral displacement of the side portion of the spring ring 4. Further, as shown in FIG. 10, the auxiliary liquid chamber 20 is defined by the rubber thin film 16e and the inner peripheral surface of the outer cylindrical body 2 on the outer peripheral side elastic body portion 16c so as to be expandable and contractable. Sub liquid chamber 20
And the pair of main liquid chambers 19 and 19 are communicated with each other through orifices 21 and 21, respectively. As shown in FIG. 11, each of the orifices 21 is formed by removing a part of the rubber layer 16d between the reinforcing cylinder 18 and the outer cylinder 2 in the circumferential direction.

8 and 9, 16f is formed on the inner surface of the lower part of the spring ring 4 so as to project upward by a predetermined amount, and the inner cylinder 1 is fixed to the spring ring 4 when the inner cylinder 1 is displaced downward. Rubber cushions to avoid direct collision, 22
Is a space in the spring ring 4 which penetrates in the cylinder axis X direction between the first rubber elastic body 15 and the rubber cushioning portion 16f.
3 is a space penetrating in the cylinder axis X direction between the downward elastic body portion 16a and both lateral elastic body portions 16b, and 24 is a space penetrating in the cylinder axis X direction between the upper portion of the spring ring 4 and the rubber thin film 16e. It is a vacant place.

Since the other construction of the cylindrical vibration damping rubber device is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

In the case of the third embodiment, the inner cylinder 1
Is connected to the engine side, the outer cylinder 2 is connected to the vehicle body side, and the own weight of the engine acts on the inner cylinder 1,
The inner cylindrical body 1 and the rubber cushioning portion 16f are separated from each other in the vertical direction via the void 22. When vertical vibration is input to the inner cylinder 1 from the engine side, when the spring ring 4 is bent and the inner cylinder 1 is relatively displaced downward, for example, the upper part of the spring ring 4 is relatively moved downward. Both sides are displaced outward due to the displacement, and both main liquid chambers 19, 1
9 is reduced, and as a result, the flow of the liquid L is generated between the auxiliary liquid chamber 20 and each of the orifices 21. Then, due to the flow of the liquid L, liquid column resonance occurs between each main liquid chamber 19 and the sub liquid chamber 20 through each orifice 21 against vibration of a specific frequency based on the shape of each orifice 21. Therefore, as in the first embodiment, the liquid column resonance can reduce the input vibration, particularly the input vibration of a specific frequency on the low frequency side. On the other hand, also in the third embodiment, the inner cylindrical body 1 is connected to the upper portion of the spring ring 4 via the first rubber elastic body 15 to prevent the spring ring 4 from being vibrated by the input vibration to the inner cylindrical body 1. Since the vibration is absorbed by the elastic deformation in the upper half portion, the vibration can be achieved in a state where the static-dynamic ratio is suppressed to be low based on the spring characteristics of the spring ring 4. As a result, in addition to the damping characteristics due to the liquid column resonance described above, it is possible to improve the dynamic characteristics based on this low static-dynamic ratio also in the third embodiment. In addition, when the vibration is absorbed by the spring ring 4, the amplitude of the spring ring 4 itself can be suppressed by the rubber coating layers 17, 17.

Further, since the main liquid chambers 19 are arranged in the horizontal direction rather than the vertical direction which is the vibration input direction with respect to the inner cylindrical body 1, the vertical direction of the main liquid chamber 19 is different from that of the first embodiment. Excessive fluctuations in hydraulic pressure due to direct impact or the like are avoided, and the durability of each lateral elastic body portion 16b defining each liquid chamber 19 can be improved. Moreover, unlike the first embodiment, it is not necessary to set the vertical positional relationship between the inner cylindrical body 1 and the downward elastic body portion to a specific one (abutting state), and it is possible to increase the degree of freedom in design. it can.

Further, since the left and right side portions of the spring ring 4 are connected to the outer cylinder body 2 by the lateral elastic body portions 16b, a gap is formed between the both side portions of the spring ring 4 and the outer cylinder body 2. The spring ring 4 when formed
It is possible to reliably eliminate the possibility of noise generation due to collision when both side portions of the are displaced outward.

<Another Example of Third Embodiment> FIG. 12 shows another embodiment of the cylindrical vibration damping rubber device according to the third embodiment. One end of each of 25 and 25 communicates with both main liquid chambers 19. Communication pipes fixed to the outer cylindrical body 2 so as to
Is a bellows bag made of, for example, rubber and is communicated with the other end of the above. The two communicating tubes 25, 25 form an orifice, and the two bellows bags 26, 26 form a sub liquid chamber.

Also in this case, each main liquid chamber 19 is expanded or contracted by the lateral displacement of the spring ring 4 due to the vibration input, and the internal liquid L flows between each bellows bag 26 through each communication pipe 25. However, the communication pipes 2 on each side generated with this flow
Due to the liquid column resonance between the main liquid chamber 19 and the bellows bag 26 via 5, the vibration in the specific frequency range on the low frequency side can be attenuated.

<Example of Another Cylindrical Vibration Isolating Rubber; Part 1> FIG.
Reference numeral 3 shows an example of another cylindrical vibration-proof rubber, which is equivalent to the one except for the constitutions relating to liquid sealing such as the main liquid chamber 19 and the sub liquid chamber 20 of the third embodiment.

In the figure, 31 is a first rubber elastic body for connecting the outer peripheral surface of the inner cylinder 1 and the upper part of the spring ring 4 to each other, and 32 is the lower part of the spring ring 4, both left and right side parts and the outer cylinder 2. A second rubber elastic body that connects the inner peripheral surface of the
Reference numeral 33 denotes a rubber coating layer which covers the inner and outer peripheral surfaces of the entire circumference of the spring ring 4 in a close contact state.

The first rubber elastic body 31 is the inner cylindrical body 1
At an inward position of the spring ring 4 and
With the eccentricity upward by a predetermined amount with respect to
Are connected to each other.

Further, the second rubber elastic body 32 is arranged such that the spring ring 4 is located inward of the outer cylinder body 2 and is substantially coaxial with the outer cylinder body 2. It is connected to the body 2 to each other. The second rubber elastic body 32 extends downward from the lower portion of the spring ring 4 and is provided between the inner peripheral surface of the outer cylindrical body 2 and the downward elastic body portion 32 a, and the spring ring 4 is provided. Laterally extending elastic body portions 32b, 32b extending outward from the left and right side portions of the outer cylindrical body 2 to the inner peripheral surface of the outer cylindrical body 2, and each of the elastic body portions 32.
The outer peripheral side elastic bodies 32c extending in the circumferential direction are provided by connecting the outer peripheral side portions of a and 32b. The reinforcing cylinder 18 is embedded in the outer peripheral elastic body portion 16c, and the reinforcing cylinder 8 is press-fitted into the inner peripheral surface of the outer cylindrical body 2 via the rubber layer 32d vulcanized and bonded to the outer peripheral side thereof. Has been done.

Further, on the inner surface of the lower portion of the spring ring 4, there is formed a rubber cushioning portion 32e which projects upward from the upper side of the downward elastic body portion 32a by a predetermined amount, and the rubber cushioning portion 32e is formed on the inner cylindrical body 1a. It serves as a stopper that limits the downward displacement of the to a predetermined amount and cushions the collision. In addition, a rubber stopper portion 32f protruding downward from the outer peripheral elastic body portion 32c at a position above the inner cylindrical body 1 is formed, and this rubber stopper portion 32f defines a predetermined upward displacement amount of the inner cylindrical body 1. It is designed to provide a stopper that is limited to the ones and a buffer when the collision occurs.

In FIG. 13, reference numeral 34 denotes a space in the spring ring 4 which penetrates in the cylinder axis X direction between the first rubber elastic body 31 and the rubber cushioning portion 32e, and 35 and 35 are downward elastic body portions. 32a and the lateral elastic portions 32b between the cylinder axis X
A space 36 penetrating in the direction, the outer peripheral elastic body portion 3 between the upper portion of the spring ring 4 and the lateral elastic body portions 32b, 32b.
2c is a void that penetrates in the cylinder axis X direction.

Since the other construction of the cylindrical vibration damping rubber device is similar to that of the first embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

In the case of the vibration damping rubber device of the above example,
In a state where the inner cylinder 1 is connected to the engine side and the outer cylinder 2 is connected to the vehicle body side, and the engine weight acts on the inner cylinder 1, the inner cylinder 1 and the rubber cushioning portion 32f are vacant. Are separated from each other in the vertical direction. When vertical vibration is input to the inner cylinder 1 from the engine side, when the spring ring 4 is elastically deformed and the inner cylinder 1 is relatively displaced in the vertical direction, the left and right sides of the spring ring 4 are Since each lateral elastic body portion 32b is connected to the outer cylinder body 2 to limit free deformation in the left-right direction, the elastic deformation of the spring ring 4 is mainly sandwiched between the lateral elastic body portions 32b and 32b. Also, it is based on the bending of the upper part, and it is possible to obtain a harder anti-vibration property. Further, as described above, since the left and right side portions of the spring ring 4 are connected to the outer cylinder body 2 by the lateral elastic body portions 32b,
When a relative external force in the left-right direction acts between the outer cylinder body 2 and the inner cylinder body 1, the spring ring 4 is relatively hardened by supplementing the elastic resistance characteristic of the spring ring 4 with respect to the external force. The elastic resistance can be exerted, and a relatively hard lateral rigidity can be secured. In addition, as in the third embodiment,
When a gap is formed between both side portions of the spring ring 4 and the outer cylindrical body 2, it is possible to reliably eliminate generation of abnormal noise due to collision when both side portions of the spring ring 4 are displaced outward. You can Further, when the vibration is absorbed by the spring ring 4, the amplitude of the spring ring 4 itself is adjusted to the rubber coating layer 1.
It can be suppressed by 7, 17.

<Example of Other Cylindrical Vibration Isolating Rubber; Part 2> FIG.
4 and FIG. 15 show another example of the cylindrical vibration-proof rubber, which is the spring ring 4 in the above-mentioned example 1
It corresponds to the one in which a predetermined gap is interposed between both side portions of the and the lateral elastic body portions 32b.

In the figure, 41 is a first rubber elastic body for connecting the outer peripheral surface of the inner cylinder 1 and the upper part of the spring ring 4'to each other, and 42 is the lower part of the spring ring 4'and the inner part of the outer cylinder 2. A second rubber elastic body that connects the peripheral surface to each other, and 43 is the second rubber elastic body.
A third rubber elastic body on the outer peripheral side is formed continuously along the outer peripheral side of the rubber elastic body along the inner peripheral surface of the outer cylindrical body 2, and 44 is on the inner and outer peripheral surfaces of the entire circumference of the spring ring 4'in the circumferential direction. It is a rubber coating layer that covers in a tightly adhered state.

The second rubber elastic body 42 has a rubber buffer portion 42a as a stopper which projects upward from the inner peripheral surface of the lower portion of the spring ring 4'and limits the downward displacement of the inner cylindrical body 1 to a predetermined amount. Are integrally formed, and the rubber cushioning layer 42a and the rubber coating layer 4 that constitutes the lower surface of the inner cylindrical body 1
The vertical distance between the inner cylinder 1 and the inner cylinder 4 is set to a predetermined value when the engine is loaded on the inner cylinder 1.

The left and right side portions of the spring ring 4'of the third rubber elastic body 43 are opposed to each other in the left and right directions.
Lateral elastic members 43a are integrally formed so as to project to the left and right sides of the spring ring 4 ', and each lateral elastic member 43a is spaced apart from each lateral part of the spring ring 4'by a predetermined distance. It is located apart. Further, the inner cylindrical body 1 is attached to the third rubber elastic body 43 above the inner cylindrical body 1.
Is integrally formed with a rubber stopper portion 43b that projects toward the side and limits the upward displacement of the inner cylindrical body 1 to a predetermined amount.
Then, in the third rubber elastic body 43, the reinforcing cylindrical body 45 is provided with the rubber layer 43c interposed between the third rubber elastic body 43 and the inner peripheral surface of the outer cylindrical body 2.
Are embedded, and the reinforcing cylinder 45 is used to reinforce the outer cylinder 2 during press fitting.

Incidentally, in FIG. 14 and FIG.
Is a space in the spring ring 4'that penetrates in the cylinder axis X direction between the first rubber elastic body 41 and the rubber cushioning portion 42a, and 47 is a central position in the circumferential direction in the second rubber elastic body 42. A space penetrating in the X direction, and 48 is a space penetrating in the cylinder axis X direction between the third rubber elastic body 43 and the circumferential portion except the lower portion of the spring ring 4.

Since the other structure of the cylindrical vibration damping rubber device is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

Then, in the case of the anti-vibration rubber device of the above example,
When the inner cylinder 1 is connected to the engine side and the outer cylinder 2 is connected to the vehicle body side, and the engine weight acts on the inner cylinder 1 (the state shown in FIG. 14), the inner cylinder 1 and the rubber cushion are Part 4
2a and the space 2a are vertically spaced apart by a predetermined distance. When vibrations are input to the inner cylinder 1 from the engine side in the vertical direction, the vibration damping characteristics can be changed stepwise according to the acting load. That is, in the range up to the downward displacement amount δ1 of the inner cylindrical body 1 in which both side portions of the spring ring 4'are brought into contact with the respective lateral elastic body portions 43a as shown by the dashed line in FIG.
Due to the elastic characteristics of the spring ring 4'connected to the outer tubular body 2 by the rubber elastic body 42, the vibration characteristics of a relatively soft fit are obtained (see a in FIG. 16). When the downward displacement of the inner cylindrical body 1 exceeds the downward displacement amount δ1,
Both side portions of the spring ring 4'are laterally elastic body portions 43a.
Since it abuts against the upper end of the spring ring 4 ', the bending characteristic of the upper portion of the spring ring 4'and the lateral elastic members 4 are suppressed.
The vibration resistance changes to a relatively hard vibration isolation characteristic based on the rigidity (elasticity) of 3a and 43a (see b in the same figure). Furthermore, the inner cylinder 1
When the downward displacement amount of δ2 becomes δ2, the inner cylindrical body 1 contacts the rubber cushioning portion 42a as shown by the chain double-dashed line in FIG. 14, and thereafter, the vibration damping characteristic based on the compression characteristic of the second rubber elastic body 42 itself. (See c in the figure).

Therefore, when the input vibration from the engine side is a vibration having a comparatively small amplitude corresponding to the range of the downward displacement amount δ1, it is relatively soft as shown in FIG. The anti-vibration characteristics can be exhibited, and thereby, the muffled sound at the time of acceleration / deceleration when used as an engine mount of an automobile can be reduced. Then, the input vibration from the engine side causes the downward displacement amount δ.
If the vibration has a relatively large amplitude that exceeds 1, it is possible to suppress the amount of displacement with respect to the input vibration sufficiently small based on the relatively hard vibration isolation characteristics shown by “b” in the figure against that vibration and to endure it. It is possible to improve the sex.

The presence of the lateral elastic body portion 43a can prevent the side portion of the spring ring 4'and the outer cylindrical body 2 from interfering with each other in the same manner as in the case of the first example.

"Part 1" and "Part 2" described above
The following is a summary of the cylindrical anti-vibration rubber device of the example.

That is, the cylindrical vibration damping rubber device described above is
An inner cylinder body is arranged so that the cylinder axis extends in a substantially horizontal direction, and an outer cylinder body is arranged so as to surround the inner cylinder body, and the inner cylinder body is provided on one of a vibration source and a vibration receiver. Body is,
On the other hand, in the cylindrical vibration-proof rubber device, wherein the outer cylindrical body is connected to each other, and the vibration is vertically input between the inner cylindrical body and the outer cylindrical body, the outer cylindrical body and the outer cylindrical body An annular spring body, which is arranged between the inner cylinder body and the inner cylinder body so as to surround the inner cylinder body and has an upper portion connected to the inner cylinder body, and an outer spring body which extends downward from a lower portion of the spring body. A downward elastic body portion arranged up to the inner peripheral surface, and a lateral elastic body portion extending laterally from the side portion of the spring body to the inner peripheral surface of the outer cylindrical body. And a rubber elastic body that connects the spring body and the outer cylinder body to each other.

In such a cylindrical type vibration damping rubber device, the above-mentioned "No. 1" is one in which the lateral elastic body portion and the side portion of the spring ring are integrally connected to each other. The second one is one in which the lateral elastic body portion and the side portion of the spring ring are arranged with a predetermined gap.

<Other Aspects of the Present Invention> The present invention is not limited to the above-mentioned first to third embodiments, but includes various other modifications. That is, in each of the above-described embodiments, the spring ring 4 is an endless cylinder, but the present invention is not limited to this, and may be formed in an annular shape having a free end, such as a C-shaped cross section. In the case of the C-shape, the upper end portion thereof may be connected to the inner cylindrical body 1 and the lower end portion thereof may be connected to the outer cylindrical body 2 by a rubber elastic body or the like. In addition, the spring ring 4
May be shaped like the spring ring 4'shown in FIG.

In the second embodiment, the restriction passage 14 connecting the upper and lower liquid chamber portions 14a and 14b of the main liquid chamber 14 to each other.
Although c is formed in an annular shape, the present invention is not limited to this, and the restriction passage may be formed by forming one or a plurality of through holes in the spring ring 4 between the liquid chamber portions 14a and 14b, for example.

Further, in each of the above embodiments, the upper part of the spring ring 4 and the inner cylindrical body 1 are connected by the rubber elastic bodies 5 and 15, but the invention is not limited to this, and other means (welding or the like) is used. Alternatively, the both 4 and 1 may be directly connected.

Further, in the first and second embodiments, the inner cylindrical body 1 side and the rubber partition wall 6e are set so as to be in contact with each other in a loaded state. Alternatively, the liquid L may immediately flow due to the downward displacement of the inner cylindrical body 1 in the state of being separated.

[0062]

As described above, according to the cylindrical anti-vibration rubber device of the first aspect of the invention, when the vibration is input in the vertical direction, the liquid flows between the auxiliary liquid chamber and the orifice via the orifice. As a result, the liquid column resonance through the orifice can attenuate the input vibration of the specific frequency based on the orifice. Moreover, while the inner cylinder is connected to the upper part of the annular spring body, the lower part of the spring body is connected to the outer cylinder through the downward elastic body portion of the rubber elastic body, so that It is possible to obtain vibration damping characteristics with a low static-dynamic ratio based on the spring characteristics. Therefore, while securing the dynamic anti-vibration characteristics based on the anti-vibration characteristics with a low static-dynamic ratio by the spring body,
The liquid column resonance between the main liquid chamber and the sub liquid chamber via the orifice can also ensure the damping characteristic for a specific frequency.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, there is a restriction between the downward convex portion projecting from the rubber partition wall into the main liquid chamber and the peripheral surface of the main liquid chamber. Due to the passage, the flow in the main liquid chamber can be generated even with respect to the input vibration on the high frequency side that causes a so-called clogging phenomenon in which the flow of the liquid through the orifice is substantially stopped. As a result, it is possible to improve the vibration damping characteristics against the above-mentioned input vibration in the high frequency region.

According to the invention described in claim 3, as in the case of the invention described in claim 1, while securing the dynamic vibration-damping property based on the vibration-damping property of the spring body having a low static-dynamic ratio, The liquid column resonance between the main liquid chamber and the sub liquid chamber via the orifice can also secure the damping characteristic for a specific frequency. In addition, since the main liquid chamber is arranged in the horizontal direction of the inner cylinder, not in the vertical direction which is the vibration input direction, excessive hydraulic pressure fluctuations are generated as compared with the case according to the invention of claim 1. It is possible to improve durability by preventing
It is not necessary to specify a specific positional relationship between the inner cylindrical body and the rubber elastic body, and the degree of freedom in design can be improved.

Further, according to the invention of claim 4, in addition to the effect of the invention of claim 1 or 3,
Since the rubber stopper portion protruding upward from the upper portion of the spring body is formed, the deformation amount of the spring body can be surely limited to a predetermined displacement amount, and the durability of the spring body can be improved. Cushioning at the time of collision and prevention of abnormal noise can be achieved together.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line BB in FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a view corresponding to FIG. 1 in an engine loaded state of the first embodiment.

FIG. 6 is a transverse sectional view showing a second embodiment.

7 is a cross-sectional view taken along the line DD of FIG.

FIG. 8 is a transverse sectional view showing a third embodiment.

9 is a cross-sectional view taken along the line EE of FIG.

10 is a cross-sectional view taken along the line FF of FIG.

11 is a cross-sectional view taken along the line GG of FIG.

FIG. 12 is a cross-sectional view showing another aspect of the third embodiment.

FIG. 13 is a cross-sectional view showing another cylindrical anti-vibration rubber device.

FIG. 14 is a cross-sectional view showing another cylindrical vibration damping rubber device different from that shown in FIG.

15 is a cross-sectional view taken along line HH of FIG.

FIG. 16 is a relationship diagram between a load and a displacement amount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 inner cylinder body 2 outer cylinder body 4 spring ring (spring body) 6,16 2nd rubber elastic body (rubber elastic body) 6a upward elastic body part 6b, 16a downward elastic body part 6e rubber partition wall 6g downward convex part 7,17 Rubber coating layer 9, 14, 19 Main liquid chamber 10, 20 Sub liquid chamber 11, 21 Orifice 14c Restricting passage 25 Communication pipe (orifice) 26 Bellows bag (sub liquid chamber) X Cylindrical shaft

Claims (4)

[Claims] 1. A vibration generating source and a vibration receiving unit, comprising: an inner cylindrical body arranged so that a cylinder axis extends in a substantially horizontal direction; and an outer cylindrical body arranged so as to surround the inner cylindrical body. A cylindrical anti-vibration rubber device in which the inner cylindrical body is connected to one side and the outer cylindrical body is connected to the other side so that vibration is vertically input between the inner cylindrical body and the outer cylindrical body. In the above, an annular spring body, which is arranged between the outer cylinder body and the inner cylinder body so as to surround the inner cylinder body, and whose upper portion is connected to the inner cylinder body, is disposed below the inner cylinder body. An upward elastic body portion that protrudes from the lower portion of the spring body that is located toward the inner cylinder body side, and a downward elastic body portion that extends downward from the lower portion of the spring body and that is disposed between the outer cylinder body peripheral surface. A rubber elastic body configured to connect the spring body and the outer cylindrical body to each other; A main liquid chamber defined by a rubber partition formed in a portion of the upward elastic body portion that vertically opposes the inner cylinder body and filled with a liquid, and a main liquid chamber that communicates with each other via an orifice and expands and contracts. And an auxiliary liquid chamber that is formed so that the inner cylindrical body is in a positional relationship of pressing the rubber partition wall with respect to the rubber elastic body by the relative downward displacement of the inner cylindrical body due to the vibration input. A cylindrical anti-vibration rubber device, which is provided. 2. The main liquid chamber according to claim 1, wherein the main liquid chamber is formed through the spring body from the upward elastic body portion to the downward elastic body portion, and in the upward elastic body portion, from the rubber partition wall to the main liquid chamber. The protruding downward convex portion is integrally formed, and a limiting passage is formed between the outer peripheral surface of the downward convex portion and the inner peripheral surface of the main liquid chamber, and the limiting passage is in a frequency range higher than the orifice. Cylindrical anti-vibration rubber device tuned to correspond 3. An inner cylinder body having a cylinder axis arranged to extend in a substantially horizontal direction, and an outer cylinder body arranged so as to surround the inner cylinder body. A cylindrical anti-vibration rubber device in which the inner cylindrical body is connected to one side and the outer cylindrical body is connected to the other side so that vibration is vertically input between the inner cylindrical body and the outer cylindrical body. In the above, an annular spring body, which is arranged between the outer cylinder body and the inner cylinder body so as to surround the inner cylinder body and has an upper portion connected to the inner cylinder body, and a downward direction from a lower portion of the spring body. A downward elastic body portion which extends and is arranged up to the inner peripheral surface of the outer cylindrical body, and a portion which extends laterally from the side portion of the spring body to the inner peripheral surface of the outer cylindrical body. A rubber elastic body configured to connect the spring body and the outer cylindrical body to each other, and a lateral elastic body portion of the rubber elastic body. A main liquid chamber, which is defined between the side portion of the spring body and the outer cylinder so as to be expanded and contracted by the lateral displacement of the spring body, and in which a liquid is sealed; A cylindrical anti-vibration rubber device, comprising: a sub liquid chamber that is communicated with the sub liquid chamber and is capable of expanding and contracting. 4. The cylindrical vibration proof according to claim 1 or 3, wherein a rubber stopper portion is formed which protrudes vertically from the spring body or the outer cylinder body and limits the upward displacement or the downward displacement of the inner cylinder body. Rubber device.