JP7027245B2 - Anti-vibration device - Google Patents

Description

The present invention relates to a vibration isolator that is applied to, for example, an automobile, an industrial machine, or the like, and absorbs and attenuates the vibration of a vibration generating portion of an engine or the like.

Conventionally, a tubular outer mounting member connected to either one of a vibration generating portion and a vibration receiving portion, and an inner mounting member connected to the other and arranged inside the outer mounting member, and an outer side. The liquid chamber between the pair of first main body rubbers and the pair of first main body rubbers, which connect the mounting member and the inner mounting member and are arranged at intervals in the axial direction along the central axis of the outer mounting member, is formed. A partition member that partitions the first liquid chamber and the second liquid chamber in the axial direction and has a limiting passage that communicates the first liquid chamber and the second liquid chamber, and connects the outer mounting member and the inner mounting member. A vibration isolator including a second main body rubber arranged outside the liquid chamber and an outer plate member to which the second main body rubber is connected is known as the outer mounting member.
In this anti-vibration device, the rubber of the second main body mainly supports the static load applied to the anti-vibration device and suppresses the relative displacement of the outer mounting member and the inner mounting member in the axial direction, while causing the vibration in the axial direction. At the time of input, the rubber of the first main body is elastically deformed, and the liquid in the liquid chamber is circulated between the first liquid chamber and the second liquid chamber through the restricted passage to attenuate and absorb the vibration. That is, the anti-vibration rubber and the liquid-sealed anti-vibration device are directly connected in the axial direction.
As this type of anti-vibration device, for example, as shown in Patent Document 1 below, a gap is provided between the inner peripheral surface of the second main body rubber and the outer peripheral surface of the inner mounting member, and the outer plate member is an annular flat plate. The structure formed in a shape is known.

European Patent Application Publication No. 2706257

However, in the conventional vibration isolator, when lateral vibration is input, the gap between the inner peripheral surface of the second main body rubber and the outer peripheral surface of the inner mounting member expands and contracts, so that the second main body rubber expands and contracts. Since the rubber is deformed, it is difficult to generate a damping force, and there is a problem that the lateral vibration cannot be damped and absorbed.

The present invention has been made in view of the above-mentioned circumstances, and is capable of attenuating and absorbing lateral vibration in a configuration in which a vibration-proof rubber and a liquid-sealed vibration-proof device are directly connected in the axial direction. The purpose is to provide a vibration device.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention is connected to a tubular outer mounting member connected to either one of a vibration generating portion and a vibration receiving portion, and is connected to the other, and is arranged inside the outer mounting member. A pair of first main body rubbers, which are connected to the inner mounting member, the outer mounting member, and the inner mounting member, and arranged at intervals in the axial direction along the central axis of the outer mounting member, and a pair. The liquid chamber between the rubbers of the first main body is axially divided into a first liquid chamber and a second liquid chamber, and a partition is formed in which a limiting passage for communicating the first liquid chamber and the second liquid chamber is formed. The member, the outer mounting member, and the inner mounting member are connected to each other, and a second main body rubber arranged outside the liquid chamber is provided. The outer mounting member is connected to the second main body rubber. The inner plate member is provided with a bound stopper that axially sandwiches the radial inner portion of the outer plate member with the first main body rubber, and is among the outer plate members. A radial inner portion facing the bound stopper in the axial direction is embedded in the second main body rubber, and the inner portion of the outer plate member includes an annular top wall whose front and back surfaces face in the axial direction and the annular top. An inner cylinder portion extending downward from the radial inner end portion of the wall along the axial direction on the rubber side of the first main body, and an outer extending downward from the radial outer end portion of the annular top wall. The outer plate member includes a tubular portion, and the outer plate member includes an outer portion that protrudes radially outward from the second main body rubber, and the outer portion is radially outer from the lower end portion of the outer cylinder portion. It is characterized in that it extends toward and is connected to either a vibration generating portion or a vibration receiving portion .

According to the present invention, the rubber of the second main body mainly supports the static load applied to the vibration isolator and suppresses the relative displacement of the outer mounting member and the inner mounting member in the axial direction, while vibrating in the axial direction. At the time of inputting, the rubber of the first main body is elastically deformed, and the liquid in the liquid chamber is circulated between the first liquid chamber and the second liquid chamber through the restricted passage, so that the vibration can be damped and absorbed. That is, a configuration is obtained in which the anti-vibration rubber and the liquid-sealed anti-vibration device are directly connected in the axial direction.
Further, among the outer plate members, the inner portion that faces the bound stopper in the axial direction and is embedded in the rubber of the second main body has an annular top wall with the front and back surfaces facing the axial direction, so that the bound stopper and the outer plate member are provided. Excessive relative displacement of the outer mounting member and the inner mounting member in the bound direction in which the rubber is relatively close to the axial direction can be suppressed, and the relative displacement amount can be adjusted with high accuracy.
Further, since the inner portion of the outer plate member includes an inner cylinder portion extending from the radial inner end portion of the annular top wall toward the rubber side of the first main body along the axial direction, the inner peripheral surface of the inner cylinder portion , The outer peripheral surface of the inner mounting member can be opposed to each other via the second main body rubber, and when the vibration in the lateral direction is input, the inner peripheral surface and the inner side of the inner cylinder portion of the second main body rubber can be opposed to each other. A damping force can be generated by elastically deforming the portion located between the mounting member and the outer peripheral surface. This makes it possible to attenuate and absorb vibrations in two directions, the axial direction and the lateral direction.

Here, in the bound stopper, the bound stopper rubber may be disposed on the surface facing the outer plate member in the axial direction.

In this case, since the bound stopper rubber is disposed on the surface of the bound stopper that faces the outer plate member in the axial direction, excessive relative displacement of the outer mounting member and the inner mounting member in the bound direction is suppressed. In addition, the portion of the second main body rubber that covers the annular top wall can be brought into contact with the bound stopper via the bound stopper rubber, and the durability of the second main body rubber can be ensured.

Further, the rubber of the second main body may be formed with a mounting hole penetrating in the axial direction, and the inner mounting member may be press-fitted into the mounting hole.

In this case, since the inner mounting member is press-fitted into the mounting hole of the second main body rubber, the position of the second main body rubber is particularly between the inner peripheral surface of the inner cylinder portion and the outer peripheral surface of the inner mounting member. It becomes possible to easily adjust the hardness of the portion to be subjected to, and it is possible to easily and accurately adjust the damping force exerted by the rubber of the second main body when the vibration in the lateral direction is input.

Further, of the pair of first main body rubbers, the first main body rubber adjacent to the second main body rubber in the axial direction faces the opposite side of the liquid chamber side along the axial direction, and the shaft is attached to the second main body rubber. The outer surfaces facing each other in the direction may be inclined with respect to both the radial direction and the axial direction in a vertical cross-sectional view along the axial direction.

In this case, of the pair of first main body rubbers, the outer surface of the first main body rubber adjacent to the second main body rubber in the axial direction is in the vertical cross-sectional view along the axial direction with respect to both the radial direction and the axial direction. Since it is inclined, it is possible to secure an axial distance between the outer surface and the end portion of the inner cylinder portion on the rubber side of the first main body, and suppress the interference between the two.

According to the present invention, in a configuration in which the anti-vibration rubber and the liquid-sealed anti-vibration device are directly connected in the axial direction, lateral vibration can be attenuated and absorbed.

It is a vertical sectional view of the vibration isolation device which concerns on one Embodiment of this invention.

Hereinafter, the vibration isolator 1 according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the vibration isolator 1 includes a cylindrical outer mounting member 11 connected to one of a vibration generating portion and a vibration receiving portion, and a tubular outer mounting member 11 connected to the other and the outer mounting member 11. A pair of first units that connect the inner mounting member 12 arranged inside, the outer mounting member 11 and the inner mounting member 12, and are arranged at intervals in the axial direction along the central axis O of the outer mounting member 11. A partition member 15 for axially partitioning the liquid chamber 14 between the main body rubbers 13a and 13b and the pair of first main body rubbers 13a and 13b, and the outer mounting member 11 and the inner mounting member 12 are connected and the liquid chamber 14 is connected. The second main body rubber 30 arranged on the outside of the is provided.

Hereinafter, the direction that intersects the central axis O in a plan view from the axial direction is referred to as a radial direction, and the direction that orbits around the central axis O is referred to as a circumferential direction.
The liquid chamber 14 is filled with, for example, ethylene glycol, water, silicone oil, or the like. This anti-vibration device 1 is applied to, for example, a cabin mount or the like, and is used in a state where the axial direction is directed in the vertical direction.

The outer mounting member 11 includes a first end member 17 and a second end member 18 to which a pair of first main body rubbers 13a and 13b are separately connected, a middle member 16 to which a partition member 15 is connected, and a second main body. The outer plate member 19 to which the rubber 30 is connected is provided.
The first end member 17 and the second end member 18 are each formed in a plate shape having a thickness in the axial direction, and the middle member 16 is formed in a cylindrical shape extending in the axial direction. The plate thickness of the first end member 17 is thinner than the plate thickness of the second end member 18. The second end member 18 is formed in an annular shape and is arranged at one end edge in the axial direction of the middle member 16. The first end member 17 is formed in an annular shape and is arranged at the other end edge of the middle member 16 in the axial direction. The first end member 17, the second end member 18, and the middle member 16 are respectively arranged coaxially with the central axis O.
Hereinafter, one side in the axial direction is referred to as a lower side, and the other side in the axial direction is referred to as an upper side.

The first end member 17 of the outer mounting member 11 is connected to the connected portion 35 provided by either the vibration generating portion or the vibration receiving portion. The connected portion 35 is connected to the upper surface of the first end member 17, the middle member 16 is connected to the lower surface of the first end member 17, and the second end member 18 is connected to the lower end opening edge of the middle member 16. There is. That is, the first end member 17 of the outer mounting member 11 is directly connected to the connected portion 35, and the middle member 16 and the second end member 18 are not directly connected to the connected portion 35. An outer plate member 19 is arranged above the first end member 17, and the first end member 17 and the outer plate member 19 sandwich the connected portion 35 in the axial direction.

The first end member 17, the second end member 18, the middle member 16, and the outer plate member 19 are integrally fixed to the first end member 17, the second end member 18, the middle member 16, and the outer plate member 19. In addition, an insertion hole 11a through which a bolt 36 for connecting the first end member 17 to the connected portion 35 is integrally formed is formed separately.

In the illustrated example, the bolt 36 is inserted from the second end member 18 side to integrally integrate the first end member 17, the second end member 18, the middle member 16, and the outer plate member 19 together with the connected portion 35. It penetrates in the axial direction. By screwing the nut 37 to the portion of the bolt 36 that protrudes upward from the outer plate member 19, the first end member 17, the second end member 18, the middle member 16, and the outer plate member 19 are integrally formed. It is fixed and the first end member 17 is connected to the connected portion 35. The bolt 36 is press-fitted into the portion of the insertion hole 11a formed in the first end member 17 and the portion formed in the second end member 18, and is formed in the middle member 16 and the outer plate member 19. In the part formed in, it is loosely fitted. A plurality of insertion holes 11a are arranged at intervals in the circumferential direction. The bolt 36 may be fitted only to the portion of the insertion hole 11a formed in the second end member 18.

The first end member 17 is provided with a first protruding portion 17a that projects inward in the radial direction and forms a part of the wall surface of the liquid chamber 14. The first protruding portion 17a protrudes inward in the radial direction from the inner peripheral edge of the first end member 17. The first protruding portion 17a is formed in a cylindrical shape and is fitted in the upper end portion of the middle member 16. The size of the first protruding portion 17a in the axial direction is larger than that of the first end member 17. The first protrusion 17a is arranged coaxially with the central axis O.

An injection hole 17b is formed in the first protrusion 17a by penetrating the first protrusion 17a in the axial direction and opening in the liquid chamber 14, and a sealing material 39 such as a rivet is attached to the injection hole 17b. The sealing material 39 is covered with the outer plate member 19 from above the sealing material 39. In the illustrated example, the upper end opening edge of the first protruding portion 17a is covered with the outer plate member 19 over the entire area thereof together with the upper surface of the first end member 17.
A recess is formed at the upper end opening edge of the first protrusion 17a, and an injection hole 17b is formed at the bottom surface of the recess. In the first protruding portion 17a, the axial size of the portion where the injection hole 17b is located is the same as the plate thickness of the first end member 17.

The second end member 18 is provided with a second protruding portion 18a that projects inward in the radial direction and forms a part of the wall surface of the liquid chamber 14. The second protruding portion 18a protrudes inward in the radial direction from the inner peripheral edge of the second end member 18. The second protruding portion 18a is formed in a cylindrical shape and is fitted in the lower end portion of the middle member 16. The size of the second protruding portion 18a in the axial direction is larger than that of the second end member 18. The second protrusion 18a is arranged coaxially with the central axis O.

The outer plate member 19 is formed in an annular shape and is arranged coaxially with the central axis O. The outer plate member 19 includes an inner portion 19a embedded in the second main body rubber 30 and an outer portion 19b protruding outward in the radial direction from the second main body rubber 30.

The inner portion 19a includes an annular top wall 19c whose front and back surfaces are axially oriented, an inner cylinder portion 19d extending downward from the radial inner end portion of the annular top wall 19c, and a radial outer side of the annular top wall 19c. An outer cylinder portion 19e extending downward from the end portion is provided. The lower end opening edge of the inner cylinder portion 19d is axially opposed to the upper first main body rubber 13a located above the pair of first main body rubbers 13a and 13b. The lower end opening edge of the inner cylinder portion 19d faces the intermediate portion in the radial direction of the upper first main body rubber 13a in the axial direction.
The outer portion 19b extends radially outward from the lower end portion of the outer cylinder portion 19e and is formed in an annular shape. The outer portion 19b is formed in a plate shape with the front and back surfaces facing in the axial direction. The lower surface of the outer portion 19b is connected to the connected portion 35 and faces the upper surface of the first end member 17 in the axial direction via the connected portion 35.
The outer mounting member 11 is not limited to the illustrated form, and may be appropriately changed, for example, the entire outer mounting member 11 may be integrally formed.

The second main body rubber 30 is arranged above the pair of first main body rubbers 13a and 13b. The second main body rubber 30 is axially adjacent to the upper first main body rubber 13a connected to the first end member 17 of the pair of first main body rubbers 13a and 13b. The second main body rubber 30 is formed in a cylindrical shape and is arranged coaxially with the central axis O. The inside of the second main body rubber 30 is a mounting hole 30a that penetrates the second main body rubber 30 in the axial direction, and the inner mounting member 12 is press-fitted into the mounting hole 30a.

The inner mounting member 12 is arranged inside the outer mounting member 11 in the radial direction. The inner mounting member 12 has a cylindrical shape and is arranged coaxially with the central axis O. The outer peripheral surface of the inner mounting member 12 is substantially parallel to the inner peripheral surface of the inner cylinder portion 19d of the outer plate member 19. Both ends of the inner mounting member 12 in the axial direction are located outside the outer mounting member 11 in the axial direction. The upper end of the inner mounting member 12 is located above the second main body rubber 30.

A bound stopper 41 is disposed at the upper end of the inner mounting member 12, and a rebound stopper 42 is disposed at the lower end of the inner mounting member 12. The bound stopper 41 and the rebound stopper 42 are each formed in an annular shape and are arranged coaxially with the central axis O. The bound stopper 41 and the rebound stopper 42 are each formed in a plate shape with the front and back surfaces facing in the axial direction.

The bound stopper 41 faces the inner portion 19a of the outer plate member 19 in the axial direction, and sandwiches the inner portion 19a of the outer plate member 19 in the axial direction between the upper first main body rubber 13a. In the bound stopper 41, the lower surface facing the outer plate member 19 in the axial direction is substantially parallel to the upper surface of the annular top wall 19c of the outer plate member 19. A bound stopper rubber 41a is arranged on the lower surface of the bound stopper 41. The bound stopper rubber 41a is adhered to the bound stopper 41. The bound stopper rubber 41a extends continuously over the entire circumference. The bound stopper rubber 41a is integrally formed with the second main body rubber 30. Of the bound stopper rubber 41a, the inner portion in the radial direction is connected axially to the inner peripheral portion of the second main body rubber 30, and the lower surface of the outer portion in the radial direction is connected to the upper surface of the outer peripheral portion of the second main body rubber 30. , Facing each other with a gap in the axial direction. The lower surface of the radial outer portion of the bound stopper rubber 41a faces the annular top wall 19c of the outer plate member 19 in the axial direction via the outer peripheral portion of the second main body rubber 30.

The rebound stopper 42 faces the second protrusion 18a in the axial direction. The second protruding portion 18a is provided with a rebound stopper rubber 42a that protrudes downward, that is, on the opposite side of the liquid chamber 14 side along the axial direction, and faces the upper surface of the rebound stopper 42 in the axial direction. The rebound stopper rubber 42a is arranged on the inner peripheral portion in the radial direction of the second protruding portion 18a, and faces the outer peripheral portion of the rebound stopper 42 in the axial direction. The rebound stopper rubber 42a extends continuously over the entire circumference. The rebound stopper rubber 42a is integrally formed with the lower first main body rubber 13b located on the lower side of the pair of first main body rubbers 13a and 13b. The lower surface of the rebound stopper rubber 42a is located below the lower surface of the second end member 18.
In the illustrated example, the rebound stopper rubber 42a is arranged on the second end member 18 via the second protruding portion 18a, but it may be arranged directly on the second end member 18.

The upper first main body rubber 13a is formed in an annular shape that gradually extends downward from the inside to the outside in the radial direction. Of the upper first main body rubber 13a, the inner end portion in the radial direction is adhered to the outer peripheral surface of the inner mounting member 12, and the outer end portion in the radial direction is adhered to the first protruding portion 17a. The upper first main body rubber 13a is connected to the first end member 17 via the first protruding portion 17a.
The lower first main body rubber 13b is formed in an annular shape that gradually extends downward from the inside to the outside in the radial direction. Of the lower first main body rubber 13b, the inner end portion in the radial direction is pressed against the outer peripheral surface of the inner mounting member 12 in a non-adhesive state, and the outer end portion in the radial direction is adhered to the second protruding portion 18a. There is. The lower first main body rubber 13b is connected to the second end member 18 via the second protruding portion 18a.

Of the pair of first main body rubbers 13a and 13b, the upper first main body rubber 13a adjacent to the second main body rubber 30 in the axial direction faces upward (opposite the liquid chamber 14 side along the axial direction) and is the first. 2 The outer surface facing the main body rubber 30 in the axial direction is inclined in both the radial direction and the axial direction in a vertical cross-sectional view along the axial direction. In the illustrated example, the outer surface of the upper first main body rubber 13a gradually extends downward from the inside to the outside in the radial direction. As a result, the outer surface of the upper first main body rubber 13a is gradually separated from the outer plate member 19 in the axial direction from the inner side to the outer side in the radial direction.

The partition member 15 has an annular shape and is arranged in the liquid chamber 14. The outer peripheral surface of the partition member 15 is connected to the inner peripheral surface of the outer mounting member 11, and the inner peripheral surface of the partition member 15 is connected to the outer peripheral surface of the inner mounting member 12. The partition member 15 partitions the liquid chamber 14 into a first liquid chamber 26 and a second liquid chamber 27 in the axial direction. Of the first liquid chamber 26 and the second liquid chamber 27, the volume of the first liquid chamber 26 located on the upper side is smaller than the volume of the second liquid chamber 27 located on the lower side. Not limited to this configuration, for example, the volume of the first liquid chamber 26 may be equal to or larger than the volume of the second liquid chamber 27.
The partition member 15 is formed with a restricted passage 21 that communicates the first liquid chamber 26 and the second liquid chamber 27. The restricted passage 21 extends beyond 360 ° around the central axis O.

The partition member 15 has an annular elastic portion 32 having an outer end portion in the radial direction connected to the outer mounting member 11, and an inner mounting member 12 fitted to the inner side, and the outer end portion in the radial direction is an elastic portion 32. It comprises a connected annular rigid body portion 33. The elastic portion 32 and the rigid body portion 33 are respectively arranged coaxially with the central axis O. The elastic portion 32 is made of, for example, a rubber material having a hardness lower than that of the rigid body portion 33. The radial inner end of the elastic portion 32 and the radial outer end of the rigid body 33 are connected to each other. The elastic portion 32 is adhered to the inner peripheral surface of the middle member 16 of the outer mounting member 11 and the radial outer end portion of the rigid body portion 33. The elastic portion 32 gradually extends downward from the inside to the outside in the radial direction. A step portion 12a formed on the outer peripheral surface of the inner mounting member 12 is in contact with the upper surface of the radial inner end portion of the rigid body portion 33.

The rigid body portion 33 includes a rigid body portion main body 34 having an orifice groove 33a forming an orifice groove 33a communicating the first liquid chamber 26 and the second liquid chamber 27 on the lower surface (one end surface facing one side in the axial direction) and the rigid body portion main body. It is provided with a lid 22 which is arranged on the lower surface of the 34 and which defines the limiting passage 21 by closing the lower opening in the orifice groove 33a.
The rigid body portion main body 34 and the lid body 22 are respectively arranged coaxially with the central axis O. The rigid body portion 34 has a larger axial size and a larger radial size than the lid body 22.

A press-fitting hole 34a into which the lid body 22 is press-fitted is formed on the lower surface of the rigid body portion main body 34. The depth of the press-fitting hole 34a is larger than the axial size of the lid 22. An orifice groove 33a is opened on the bottom surface of the press-fitting hole 34a. On the lower surface of the rigid body main body 34, the inner peripheral edge portion located inside the press-fitting hole 34a in the radial direction is located above the outer peripheral edge portion located radially outside the press-fitting hole 34a. The lower surface of the lid 22 is flush with the inner peripheral edge of the lower surface of the rigid body main body 34.
A first opening 34b that opens at one end in the circumferential direction of the orifice groove 33a is formed on the upper surface of the rigid body main body 34. The lid 22 is formed with a second opening 22a that opens at the other end of the orifice groove 33a in the circumferential direction.

Here, a support metal fitting 23 for sandwiching the lid 22 with the bottom surface of the press-fitting hole 34a is embedded in the lower first main body rubber 13b. The support metal fitting 23 is formed in a cylindrical shape and is arranged coaxially with the central axis O. The support metal fitting 23 is embedded in the inner peripheral edge portion of the lower first main body rubber 13b. The upper end opening edge of the support metal fitting 23 is located flush with or slightly below the upper surface of the inner peripheral edge portion of the lower first main body rubber 13b. The upper end opening edge of the support metal fitting 23 supports the inner peripheral edge portion on the lower surface of the lid 22. The upper end opening edge of the support metal fitting 23 may support the outer peripheral edge portion on the lower surface of the lid 22 or the radial intermediate portion.

The upper end portion of the support metal fitting 23 has a larger inner diameter and outer diameter than the portion located below the upper end portion, and is located outside in the radial direction. A part of the lower first main body rubber 13b is filled inside the upper end portion of the support metal fitting 23. Of the lower first main body rubber 13b, a portion (hereinafter referred to as an annular seal portion) 13c located inside the upper end portion of the support metal fitting 23 extends continuously over the entire circumference. The annular seal portion 13c is in pressure contact with the lower surface of the lid 22 and the lower surface of the rigid body main body 34. The annular seal portion 13c is in pressure contact with the inner peripheral edge portion of the lower surface of each of the lid body 22 and the rigid body portion main body 34.

As described above, according to the vibration isolator 1 according to the present embodiment, the second main body rubber 30 mainly supports the static load applied to the vibration isolator 1, and also supports the outer mounting member 11 and the inner mounting. While suppressing the relative displacement of the member 12 in the axial direction, when the vibration in the axial direction is input, the rubbers 13a and 13b of the first main body are elastically deformed, and the liquid in the liquid chamber 14 is transferred to the first liquid chamber 26 and the second liquid chamber. Vibration can be dampened and absorbed by circulating between the 27 and the restricted passage 21. That is, a configuration is obtained in which the anti-vibration rubber and the liquid-sealed anti-vibration device are directly connected in the axial direction.

Further, of the outer plate member 19, the inner portion 19a facing the bound stopper 41 in the axial direction and embedded in the second main body rubber 30 includes an annular top wall 19c whose front and back surfaces face in the axial direction. Excessive relative displacement of the outer mounting member 11 and the inner mounting member 12 in the bound direction in which the stopper 41 and the outer plate member 19 are relatively close to each other in the axial direction can be suppressed, and the relative displacement amount can be made highly accurate. Can be adjusted.

Further, since the inner portion 19a of the outer plate member 19 includes an inner cylinder portion 19d extending downward from the radial inner end portion of the annular top wall 19c, the inner peripheral surface of the inner cylinder portion 19d and the inner mounting member are provided. The outer peripheral surface of the 12 can be opposed to each other via the second main body rubber 30, and the inner peripheral surface and the inner side of the inner cylinder portion 19d of the second main body rubber 30 when the vibration in the lateral direction is input. A damping force can be generated by elastically deforming the portion located between the mounting member 12 and the outer peripheral surface. This makes it possible to attenuate and absorb vibrations in two directions, the axial direction and the lateral direction.

Further, in the bound stopper 41, since the bound stopper rubber 41a is disposed on the lower surface facing the outer plate member 19 in the axial direction, excessive relative displacement of the outer mounting member 11 and the inner mounting member 12 in the bound direction is provided. The portion of the second main body rubber 30 that covers the annular top wall 19c can be brought into contact with the bound stopper 41 via the bound stopper rubber 41a, and the durability of the second main body rubber 30 can be suppressed. Can be secured.

Further, since the inner mounting member 12 is press-fitted into the mounting hole 30a of the second main body rubber 30, in particular, the inner peripheral surface of the inner cylinder portion 19d and the outer peripheral surface of the inner mounting member 12 of the second main body rubber 30. It becomes possible to easily adjust the hardness of the portion located between and, and it is possible to easily and accurately adjust the damping force exerted by the second main body rubber 30 when the vibration in the lateral direction is input.

Further, of the pair of first main body rubbers 13a and 13b, the outer surface of the upper first main body rubber 13a adjacent to the second main body rubber 30 in the axial direction is in the radial direction and the axial direction in the vertical cross-sectional view along the axial direction. Since it is inclined with respect to both directions, it is possible to secure an axial distance between the outer surface and the lower end portion of the inner cylinder portion 19d and suppress interference between the two.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the lower first main body rubber 13b is pressed against the outer peripheral surface of the inner mounting member 12 in a non-adhesive state, and the upper first main body rubber 13a is adhered to the outer peripheral surface of the inner mounting member 12. Although the configuration is shown, the upper first main body rubber 13a is pressed against the outer peripheral surface of the inner mounting member 12 in a non-adhesive state, and the lower first main body rubber 13b is adhered to the outer peripheral surface of the inner mounting member 12. May be adopted.
Further, in the above embodiment, the outer surface of the upper first main body rubber 13a gradually extends downward from the inside to the outside in the radial direction, but the outer surface of the upper first main body rubber 13a is shown. It may gradually extend downward from the outside to the inside in the radial direction, or may extend straight in the radial direction.

Further, in the above embodiment, the support metal fitting 23 is embedded in the lower first main body rubber 13b, but the lid 22 is press-fitted by the lower first main body rubber 13b in which the support metal fitting 23 is not embedded. It may be sandwiched between the bottom surface of the hole 34a and the bottom surface.
Further, in the above embodiment, the lower first main body rubber 13b is pressed against the lower surface of the lid 22 and the lower surface of the rigid body main body 34, but the lower first main body rubber 13b is the lid. Even if a configuration that does not abut on both the lower surface of the body 22 and the lower surface of the rigid body main body 34, or a configuration that abuts on either the lower surface of the lid 22 or the lower surface of the rigid body main body 34 is adopted. good.

Further, in the above embodiment, the second main body rubber 30 is arranged above the pair of first main body rubbers 13a and 13b, and the outer plate member 19 is arranged above the first end member 17. As shown, a configuration is adopted in which the second main body rubber 30 is arranged below the pair of first main body rubbers 13a and 13b, and the outer plate member 19 is arranged below the second end member 18. May be good.
Further, the second main body rubber 30 may be adhered to the outer peripheral surface of the inner mounting member 12.

Further, in the above embodiment, the first protruding portion 17a is disposed on the first end member 17, and the second protruding portion 18a is disposed on the second end member 18, but the first protruding portion 17a is shown. And the configuration in which the first main body rubbers 13a and 13b are directly connected to the first end member 17 and the second end member 18 without having the second protruding portion 18a may be adopted.
Further, the plate thickness of the first end member 17 may be equal to or greater than the plate thickness of the second end member 18.
Further, the injection hole 17b is not limited to the first protrusion 17a, but may be formed in, for example, a second protrusion 18a or an outer mounting member 11, and the size of the first protrusion 17a in the axial direction is large. It may be formed in a portion different from the plate thickness of the first end member 17, or a vibration isolator having no injection hole 17b may be adopted.

Further, the sealing material 39 may be exposed to the outside of the vibration isolator 1.
The present invention can also be applied to a vibration isolator that does not have the bound stopper rubber 41a, the rebound stopper 42, and the rebound stopper rubber 42a.
For example, in the above embodiment, the partition member 15 is provided with the elastic portion 32 and the rigid body portion 33, but the present invention is not limited to such an embodiment, and for example, a configuration including only the rigid body portion may be adopted. ..
Further, the restricted passage 21 may extend less than 360 ° around the central axis O.
Further, the orifice groove 33a may be formed on the outer peripheral surface of the rigid body portion main body 34.

The vibration isolator 1 is not limited to the cabin mount of the vehicle, and can be applied to other than the cabin mount. For example, it can be applied to an engine mount for a vehicle, a bush, a mount of a generator mounted on a construction machine, or it can be applied to a mount of a machine installed in a factory or the like.

In addition, it is possible to appropriately replace the components in the above-described embodiment with well-known components without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

1 Anti-vibration device 11 Outer mounting member 12 Inner mounting member 13a, 13b 1st main body rubber 14 Liquid chamber 15 Partition member 19 Outer plate member 19a Inner part 19c Circular top wall 19d Inner cylinder 21 Restricted passage 26 1st liquid chamber 27th 2 Liquid chamber 30 2nd body rubber 30a Mounting hole 41 Bound stopper 41a Bound stopper rubber O Center axis

Claims (4)

A cylindrical outer mounting member connected to either one of the vibration generating portion and the vibration receiving portion, and an inner mounting member connected to the other and arranged inside the outer mounting member.
A pair of first main body rubbers that connect the outer mounting member and the inner mounting member and are arranged at intervals in the axial direction along the central axis of the outer mounting member.
The liquid chamber between the pair of rubbers of the first main body is divided into a first liquid chamber and a second liquid chamber in the axial direction, and a restricted passage for communicating the first liquid chamber and the second liquid chamber is formed. With the partition member
The outer mounting member and the inner mounting member are connected to each other, and a second main body rubber arranged outside the liquid chamber is provided.
The outer mounting member includes an outer plate member to which the second main body rubber is connected.
The inner mounting member is provided with a bound stopper that axially sandwiches the radial inner portion of the outer plate member with the first main body rubber.
Of the outer plate member, the inner portion in the radial direction facing the bound stopper in the axial direction is embedded in the rubber of the second main body.
The inner portion of the outer panel member is directed downward from the annular top wall whose front and back surfaces are oriented in the axial direction and the rubber side of the first main body along the axial direction from the radial inner end portion of the annular top wall. An inner cylinder portion extending downward from the radial outer end portion of the annular top wall is provided with an outer cylinder portion extending downward.
The outer plate member includes an outer portion protruding outward in the radial direction from the second main body rubber.
A vibration isolator characterized in that the outer portion extends radially outward from the lower end portion of the outer cylinder portion and is connected to either a vibration generating portion or a vibration receiving portion . The vibration isolator according to claim 1, wherein in the bound stopper, a bound stopper rubber is disposed on a surface facing the outer plate member in the axial direction. The vibration isolator according to claim 1 or 2, wherein a mounting hole penetrating in the axial direction is formed in the second main body rubber, and the inner mounting member is press-fitted into the mounting hole. Of the pair of first main body rubbers, the first main body rubber adjacent to the second main body rubber in the axial direction faces the opposite side of the liquid chamber side along the axial direction, and is axially attached to the second main body rubber. The vibration isolator according to any one of claims 1 to 3, wherein the facing outer surfaces are inclined in both the radial direction and the axial direction in a vertical cross-sectional view along the axial direction. ..

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