JP2021076225A - Vibration control device - Google Patents

Abstract

To attenuate and absorb vibration in a lateral direction, in a constitution in which a rubber vibration isolator and a liquid seal vibration control device are directly connected in an axial direction.SOLUTION: A vibration control device includes a second main body rubber 30 connecting an outer mounting member 11 and an inner mounting member 12 and disposed outside of a liquid chamber 14 between a pair of first main body rubbers 13a, 13b, the outer mounting member includes an outer plate member 19 to which the second main body rubber is connected, the inner mounting member is provided with a bound stopper 41 for axially holding an inner part 19a in a radial direction of the outer plate member with the first main body rubbers, the inner part in a radial direction axially opposed to the bound stopper, of the outer plate member is buried in the second main body rubber, and the inner part of the outer plate member includes an annular top wall 19c of which front and rear faces are directed in the axial direction, an inner cylindrical portion 19d extended toward the first main body rubber side along the axial direction from an inner end portion in the radial direction of the annular top wall, and a receiving plate portion 19f extended toward a radial inner side from an end portion at the first main body rubber side along the axial direction, of the inner cylindrical portion.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vibration isolator that is applied to, for example, automobiles, industrial machines, etc., and absorbs and attenuates vibrations of vibration generating parts such as engines.

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 are connected to 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 connects the first liquid chamber and the second liquid chamber is connected to 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 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, the second main body rubber expands and contracts so that 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 when lateral vibration is input. Is deformed, so that a damping force is unlikely to be generated, and there is a problem that 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. It is an object of the present invention to provide a vibration device.

In order to solve the above problems, the present invention proposes the following means.
The anti-vibration device according to the present invention is connected to a tubular outer mounting member connected to 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 that connect the inner mounting member, 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, and a pair. The liquid chamber between the rubbers of the first main body is partitioned 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. 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 is connected to the second main body rubber. A bound stopper is provided on the inner mounting member so as to sandwich the radial inner portion of the outer plate member in the axial direction with the first main body rubber, and the outer plate member is provided. Of these, the inner portion in the radial direction 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 has an annular top wall whose front and back surfaces face in the axial direction. An inner cylinder portion extending from the radial inner end portion of the annular top wall toward the first main body rubber side along the axial direction, and the first main body rubber side along the axial direction of the inner cylinder portion. A receiving plate portion extending inward in the radial direction from the end portion of the rubber plate is provided.

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 limiting 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 whose front and back surfaces face in 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 bounce 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 A damping force can be generated by elastically deforming the intervening portion located between the mounting member and the outer peripheral surface. As a result, vibrations in two directions, the axial direction and the lateral direction, can be attenuated and absorbed.
Further, since the inner portion of the outer plate member includes a receiving plate portion extending inward in the radial direction from the end portion on the rubber side of the first main body along the axial direction in the inner cylinder portion, the intervening portion of the rubber of the second main body is provided. However, it is supported by the receiving plate portion from the rubber side of the first main body along the axial direction, and the deformation of the intervening portion or the like due to the input of the vibration in the axial direction can be suppressed by the receiving plate portion. It is possible to reduce the load generated in the intervening portion when the vibration in the axial direction is input.

The connecting portion between the inner cylinder portion and the receiving plate portion may be curved so as to project outward in the radial direction.

In this case, since the connecting portion between the inner cylinder portion and the receiving plate portion is curved so as to project outward in the radial direction, the load generated in the connecting portion is suppressed when the vibration in the axial direction is input. In addition to being able to do so, while ensuring a radial gap between the radial inner end of the receiving plate and the outer peripheral surface of the inner mounting member, from the inner peripheral surface of the inner cylinder to the inside in the radial direction. It is possible to secure the protruding length of the facing receiving plate portion.

The protruding length of the receiving plate portion from the inner peripheral surface of the inner cylinder portion toward the inside in the radial direction may be smaller than the radial width of the annular top wall.

In this case, since the protruding length of the receiving plate portion from the inner peripheral surface of the inner cylinder portion toward the inside in the radial direction is smaller than the radial width of the annular top wall, when the vibration in the axial direction is input, The load generated in the connection portion can be reliably suppressed, and a radial gap between the radial inner end portion of the receiving plate portion and the outer peripheral surface of the inner mounting member can be reliably secured. ..

Of the pair of the 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 second main body rubber The outer surface facing the axial 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 longitudinal 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 receiving plate portion and suppress 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, it is possible to attenuate and absorb the vibration in the lateral direction.

It is a top view of the vibration isolation device which concerns on one Embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III of FIG.

Hereinafter, the vibration isolator 1 according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the vibration isolator 1 has a tubular outer mounting member 11 connected to one of a vibration generating portion and a vibration receiving portion, and an outer mounting member 11 connected to the other. A pair of inner mounting members 12 arranged inside the member 11, connecting the outer mounting member 11 and the inner mounting member 12, and arranged at intervals in the axial direction along the central axis O of the outer mounting member 11. The partition member 15 for axially partitioning the liquid chamber 14 between the first 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 to each other. A second main body rubber 30 arranged on the outside of the liquid chamber 14 is provided.

Hereinafter, in a plan view from the axial direction, the direction intersecting the central axis O is referred to as the radial direction, and the direction orbiting around the central axis O is referred to as the circumferential direction.
For example, ethylene glycol, water, silicone oil, etc. are sealed in the liquid chamber 14. 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, an inner member 16 to which a partition member 15 is connected, and a second main body. An 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 an annular shape and are arranged coaxially with the central axis O. The middle member 16 is formed in a tubular shape extending in the axial direction, and is arranged coaxially with the central axis O. The first end member 17 and the second end member 18 are separately fitted in both ends in the axial direction of the middle member 16.
Hereinafter, in the axial direction, the side where the first end member 17 is located with respect to the second end member 18 is referred to as the upper side, and the side where the second end member 18 is located with respect to the first end member 17 is referred to as the upper side. It is called the lower side.

The upper end portion of the first end member 17 is positioned so as to project upward with respect to the middle member 16 over the entire length in the circumferential direction. A first flange portion 17a is provided at the upper end portion of the first end member 17 so as to project outward in the radial direction and cover the upper end opening edge 16a of the middle member 16. The upper surface of the first flange portion 17a is flush with the upper end surface of the first end member 17.
It is not necessary to provide the first flange portion 17a on the first end member 17. The first end member 17 may be positioned in the middle member 16 over the entire length in the axial direction.

A protruding rib 17d that projects upward and extends in the circumferential direction is formed on the upper end surface of the first end member 17. The protruding rib 17d is formed on the inner peripheral edge portion on the upper end surface of the first end member 17. The protruding rib 17d extends continuously over the entire length in the circumferential direction. The protruding rib 17d does not have to be formed on the first end member 17.
The protruding rib 17d is fitted in the mounting hole 35a formed in the connected portion 35, which will be described later. This makes it possible to suppress the relative positional deviation between the first end member 17 and the connected portion 35, and when vibration is input, the first end member 17 and the connected portion 35 collide with each other and make an abnormal noise. Can be suppressed.

The lower end portion of the second end member 18 is positioned so as to project downward with respect to the middle member 16 over the entire length in the circumferential direction. A second flange portion 18a is provided at the lower end portion of the second end member 18 so as to project outward in the radial direction and cover the lower end opening edge 16b of the middle member 16. The lower surface of the second flange portion 18a is flush with the lower end surface of the second end member 18.
The second end member 18 does not have to be provided with the second flange portion 18a. The second end member 18 may be positioned in the middle member 16 over the entire length in the axial direction.

A first mounting protrusion 24 is provided on the outer peripheral surface of the middle member 16 so as to project outward in the radial direction. The second end member 18 is provided with a second mounting protrusion 25 that protrudes outward in the radial direction. The positions of the first mounting protrusion 24 and the second mounting protrusion 25 in the circumferential direction are the same as each other. The first mounting protrusion 24 and the second mounting protrusion 25 are provided on both sides of the central axis O in the radial direction, respectively.

The first mounting protrusion 24 is provided over the entire length in the axial direction on the outer peripheral surface of the middle member 16. The lower end surface of the first mounting protrusion 24 is flush with the lower end opening edge 16b of the middle member 16. The upper end of the first mounting protrusion 24 is positioned so as to project upward with respect to the middle member 16. The upper end surface of the first mounting protrusion 24 may be flush with the upper end opening edge 16a of the middle member 16. The first flange portion 17a is not arranged on the upper end surface of the first mounting protrusion 24, but the connected portion 35 provided by either the vibration generating portion or the vibration receiving portion is arranged. Of the surface of the upper end portion of the first mounting protrusion 24, the inner surface 24a facing inward in the radial direction extends in the axial direction and extends along a straight line circumscribing the inner peripheral surface of the middle member 16 when viewed from the axial direction. It is a flat surface. The outer peripheral surfaces of the first flange portions 17a are in contact with or close to each inner surface 24a at the upper end portions of the pair of first mounting protrusions 24 in the radial direction.

The first flange portion 17a is formed with a chamfered portion 17b extending along the inner surface 24a of the upper end portion of the first mounting protrusion 24 when viewed from the axial direction. The chamfered portions 17b are provided on both sides of the central axis O in the radial direction. A pair of chamfered portions 17b are radially sandwiched by each inner surface 24a at the upper end portion of the pair of first mounting protrusions 24. The upper surface of the first flange portion 17a and the upper end surface of the first end member 17 are located at positions in the axial direction equivalent to the upper end surface of the first mounting protrusion 24.

The second mounting protrusion 25 is provided on the second flange portion 18a of the second end member 18. The second mounting protrusion 25 projects radially outward from the second flange portion 18a. The second mounting protrusion 25 is formed in a plate shape having a thickness in the axial direction. The plate thicknesses of the second mounting protrusion 25 and the second flange 18a are the same as each other. The upper and lower surfaces of the second mounting protrusion 25 are flush with the upper and lower surfaces of the second flange portion 18a. The upper surface of the second mounting protrusion 25 is arranged on the lower end surface of the first mounting protrusion 24.
The plate thickness of the second mounting protrusion 25 is thicker than the plate thickness of the first flange portion 17a. The plate thickness of the second mounting protrusion 25 may be equal to or less than the plate thickness of the first flange portion 17a.

The first mounting protrusion 24 and the second mounting protrusion 25 are integrally fixed to the first mounting protrusion 24 and the second mounting protrusion 25, and the first mounting protrusion 24 is connected to the connected portion 35. Insertion holes 11a through which the fixing bolts 36 are inserted are formed separately.
Here, the outer plate member 19 is arranged above the first end member 17 and the first mounting protrusion 24. The upper end surfaces of the first end member 17 and the first mounting protrusion 24, the upper surface of the first flange portion 17a, and the lower surface of the outer plate member 19 sandwich the connected portion 35 in the axial direction.

The fixing bolt 36 is inserted into the insertion hole 11a from below, and penetrates the second mounting protrusion 25, the first mounting protrusion 24, and the outer plate member 19 together with the connected portion 35 in the axial direction. There is. The nut 37 is screwed to the portion of the fixing bolt 36 that protrudes upward from the outer plate member 19, so that the second mounting protrusion 25, the first mounting protrusion 24, and the outer plate member 19 are integrally fixed. The first mounting protrusion 24 is connected to the connected portion 35 without interposing the first end member 17. In the illustrated example, the tubular body 25a is fitted into the insertion hole 11a of the second mounting protrusion 25. The fixing bolt 36 is inserted into the insertion hole 11a of the first mounting protrusion 24 through the inside of the tubular body 25a. The fixing bolt 36 is press-fitted into the tubular body 25a.

A first of the first end members 17, which is located below the upper end and extends radially inward toward the upper part of the outer peripheral surface of the portion fitted in the middle member 16. An inclined surface 17c is formed. The first inclined surface 17c is provided on a portion of the first end member 17 that is separated from the pair of chamfered portions 17b in the circumferential direction. The first inclined surfaces 17c are provided on both sides of the central axis O in the radial direction.
The lower part of the outer peripheral surface of the portion of the first end member 17 that is located below the upper end and is fitted in the middle member 16 extends substantially straight in the axial direction over the entire length in the circumferential direction.

A second end member 18 that is located above the lower end and extends radially outward toward the lower part of the outer peripheral surface of the portion fitted in the middle member 16. An inclined surface 18c is formed. The second inclined surface 18c is provided at a portion of the second end member 18 that is separated from the pair of second mounting protrusions 25 in the circumferential direction. The second inclined surface 18c is provided on both sides of the central axis O in the radial direction.
The upper portion of the outer peripheral surface of the portion of the second end member 18 located above the lower end portion and fitted in the middle member 16 extends substantially straight in the axial direction over the entire length in the circumferential direction.

The inclination angles of the first inclined surface 17c and the second inclined surface 18c with respect to the axial direction are equal to each other. The first inclined surface 17c and the second inclined surface 18c extend in the circumferential direction. The central portions of the first inclined surface 17c and the second inclined surface 18c adjacent to each other in the axial direction in the circumferential direction coincide with each other. The circumferential length of the first inclined surface 17c is longer than the circumferential length of the second inclined surface 18c.

A first crimping portion 28 for tightening the outer peripheral surface of the first end member 17 is formed at the upper end portion of the middle member 16. A second crimping portion 29 for tightening the outer peripheral surface of the second end member 18 is formed at the lower end portion of the middle member 16. The first crimping portion 28 and the second crimping portion 29 are formed in the middle member 16 at a portion separated from the insertion hole 11a of the first mounting protrusion 24 in the circumferential direction. In the illustrated example, the first crimping portion 28 and the second crimping portion 29 are formed in the middle member 16 at a portion separated from the first mounting protrusion 24 in the circumferential direction. The first crimping portion 28 and the second crimping portion 29 are provided on both sides of the central axis O in the radial direction, respectively.

Both the inner peripheral surface and the outer peripheral surface of each of the first crimping portion 28 and the second crimping portion 29 extend inward in the radial direction toward the outside in the axial direction. The inner peripheral surface of the first crimping portion 28 tightens the first inclined surface 17c over almost the entire area, and the inner peripheral surface of the second crimping portion 29 tightens the second inclined surface 18c over almost the entire area. The outer peripheral surface of the first crimping portion 28 is covered from above by the first flange portion 17a, and the outer peripheral surface of the second crimping portion 29 is covered from below by the second flange portion 18a.

The inclination angles of the first crimping portion 28 and the second crimping portion 29 with respect to the axial direction are equal to each other. As shown in FIG. 3, the first crimping portion 28 and the second crimping portion 29 extend in the circumferential direction. The central portions in the circumferential direction of the first crimping portion 28 and the second crimping portion 29, which are adjacent to each other in the axial direction, coincide with each other. The circumferential length of the first crimping portion 28 is longer than the circumferential length of the second crimping portion 29. The circumferential distance between the second crimping portions 29 adjacent to each other in the circumferential direction is shorter than the circumferential length of the second crimping portion 29.

Of the first end member 17, the part to be crimped along the circumferential direction tightened to the first crimping portion 28 projects upward from the middle member 16. In the illustrated example, as described above, the upper end portion of the first end member 17 projects upward from the middle member 16 over the entire length in the circumferential direction. A first inclined surface 17c is formed on the outer peripheral surface of the to be tightened portion of the first end member 17. The first flange portion 17a described above is provided over the entire length in the circumferential direction at the upper end portion of the first end member 17, including the portion to be tightened.
Of the first end member 17, the upper end portion may be projected upward from the middle member 16 or the first flange portion 17a may be provided only in the portion to be tightened.

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 face in the axial direction, an inner cylinder portion 19d extending downward from the radial inner end portion of the annular top wall 19c, and a radial outer portion of the annular top wall 19c. An outer cylinder portion 19e extending downward from the end portion and a receiving plate portion 19f extending radially inward from the lower end portion of the inner cylinder portion 19d are provided.

The outer portion 19b extends radially outward from the lower end 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. The lower surface of the outer portion 19b is axially opposed to the upper end surfaces of the first mounting protrusion 24 and the first end member 17 and the upper surface of the first flange portion 17a via the connected portion 35.

The receiving plate portion 19f is axially opposed to the upper first main body rubber 13a located above the pair of first main body rubbers 13a and 13b. The connecting portion between the inner cylinder portion 19d and the receiving plate portion 19f is curved so as to project outward in the radial direction. The receiving plate portion 19f, the connecting portion, and the inner cylinder portion 19d are smoothly connected without a step, a corner portion, or the like. The protruding length of the receiving plate portion 19f from the inner peripheral surface of the inner cylinder portion 19d toward the inside in the radial direction is smaller than the radial width of the annular top wall 19c. The lower surface of the receiving plate portion 19f is located at an axial position equivalent to the lower surface of the outer portion 19b.

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 tubular 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 tubular 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. The outer peripheral surface of the inner mounting member 12 is separated inward from the radial inner end portion of the receiving plate portion 19f. 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 bounce 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 bounce stopper 41 and the rebound stopper 42 are each formed in an annular shape and are arranged coaxially with the central axis O. The bounce 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 bounce stopper 41 faces the inner portion 19a of the outer plate member 19 in the axial direction, and sandwiches at least the inner cylinder portion 19d and the receiving plate portion 19f in the axial direction between the upper first main body rubber 13a. In the bound stopper 41, the lower surface of the outer plate member 19 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 bounce stopper rubber 41a extends continuously over the entire length in the circumferential direction. The bounce stopper rubber 41a is integrally formed with the second main body rubber 30. Of the bounce stopper rubber 41a, the inner portion in the radial direction is connected to the inner peripheral portion of the second main body rubber 30 in the axial direction, and the lower surface of the outer portion in the radial direction is 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 is axially opposed to the annular top wall 19c of the outer plate member 19 via the outer peripheral portion of the second main body rubber 30.

The rebound stopper 42 faces the lower end surface of the second end member 18 in the axial direction. On the lower end surface of the second end member 18, a rebound stopper rubber 42a that projects on the opposite side of the liquid chamber 14 side along the axial direction, that is, downward, and faces the upper surface of the rebound stopper 42 in the axial direction is arranged. .. The rebound stopper rubber 42a is arranged on the inner portion in the radial direction on the lower end surface of the second end member 18, 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 length in the circumferential direction. The rebound stopper rubber 42a is formed integrally 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 upper first main body rubber 13a is formed in an annular shape and is arranged coaxially with the central axis O. 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 end member 17.
The lower first main body rubber 13b is formed in an annular shape and is arranged coaxially with the central axis O. Of the lower first main body rubber 13b, the inner end portion in the radial direction is pressure-welded to 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 end member 18. There is.

The outer surface of the upper first main body rubber 13a facing upward (opposite to the liquid chamber 14 side along the axial direction) and facing the second main body rubber 30 in the axial direction has a diameter in a vertical cross-sectional view along the axial direction. It is tilted in both the directional and axial directions. In the illustrated example, the outer surface of the upper first main body rubber 13a extends downward from the inside to the outside in the radial direction. The outer surface of the upper first main body rubber 13a is axially separated from the second main body rubber 30 and the outer plate member 19 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.
The partition member 15 is formed with a limiting passage 21 that communicates the first liquid chamber 26 and the second liquid chamber 27. The restriction passage 21 extends beyond 360 ° around the central axis O.

The partition member 15 has an annular elastic portion 32 in which the outer end portion in the radial direction is connected to the outer mounting member 11, and the inner mounting member 12 is fitted inside, and the outer end portion in the radial direction is the elastic portion 32. It includes 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 outer end portion in the radial direction of the rigid body portion 33. 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 is arranged on the lower surface of the rigid body portion main body 34 having an orifice groove 33a for communicating the first liquid chamber 26 and the second liquid chamber 27 on the lower surface thereof, and in the orifice groove 33a. A lid 22 that defines the restriction passage 21 by closing the lower opening is provided.
The rigid body main body 34 and the lid 22 are respectively arranged coaxially with the central axis O. The rigid body main body 34 has a larger axial size and a larger radial size than the lid 22.

A press-fitting hole 34a into which the lid 22 is press-fitted is formed on the lower surface of the rigid body 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-fit 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 positions of the inner peripheral edges of the lower surface of the lid 22 and the lower surface of the rigid body 34 in the axial direction are the same as each other.
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, in the lower first main body rubber 13b, a support metal fitting 23 that sandwiches the lid body 22 with the bottom surface of the press-fitting hole 34a is embedded. The support metal fitting 23 is formed in a tubular shape and is arranged coaxially with the central axis O. The support metal fitting 23 is embedded in the inner peripheral edge 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 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 body 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 body 22 or the intermediate portion in the radial direction.

The upper end portion of the support metal fitting 23 has a larger inner diameter and outer diameter than a 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 length in the circumferential direction. The annular seal portion 13c is pressure-welded over 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 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 that faces the bound stopper 41 in the axial direction and is 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 bouncing 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 The outer peripheral surfaces of the 12 can be opposed to each other via the second main body rubber 30, and when the vibration in the lateral direction is input, the inner peripheral surface and the inner side of the inner cylinder portion 19d of the second main body rubber 30 can be opposed to each other. A damping force can be generated by elastically deforming the intervening portion located between the mounting member 12 and the outer peripheral surface. As a result, vibrations in two directions, the axial direction and the lateral direction, can be attenuated and absorbed.

Further, since the inner portion 19a of the outer plate member 19 includes the receiving plate portion 19f extending radially inward from the lower end portion of the inner cylinder portion 19d, the intervening portion of the second main body rubber 30 is the receiving plate portion. Since it is supported from the lower side by 19f, deformation of the intervening portion or the like due to the input of axial vibration can be suppressed by the receiving plate portion 19f, and the intervening portion is suppressed when the axial vibration is input. It is possible to reduce the load generated in.

Since the connecting portion between the inner cylinder portion 19d and the receiving plate portion 19f is curved so as to project outward in the radial direction, it is possible to suppress the load generated in the connecting portion when the vibration in the axial direction is input. In addition, while ensuring a radial gap between the radial inner end portion of the receiving plate portion 19f and the outer peripheral surface of the inner mounting member 12, the radial direction from the inner peripheral surface of the inner cylinder portion 19d It is possible to secure the protruding length of the receiving plate portion 19f toward the inside.

Since the protruding length of the receiving plate portion 19f from the inner peripheral surface of the inner cylinder portion 19d toward the inside in the radial direction is smaller than the radial width of the annular top wall 19c, when the vibration in the axial direction is input, The load generated in the connection portion can be reliably suppressed, and a radial gap between the radial inner end portion of the receiving plate portion 19f and the outer peripheral surface of the inner mounting member 12 can be reliably secured. Can be done.

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 bidirectional 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 the relative direction, it is possible to secure an axial distance between the outer surface and the receiving plate portion 19f 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 extends downward from the inner side to the outer side in the radial direction, but the outer surface of the upper first main body rubber 13a has a diameter. It may extend downward or straight in the radial direction from the outside to the inside in the 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 is adopted in which the lower surface of the body 22 and the lower surface of the rigid body main body 34 are not in contact with each other, or the lower surface of the lid 22 and the lower surface of the rigid body main body 34 are in contact with each other. Good.

Further, in the above embodiment, the second main body rubber 30 and the outer plate member 19 are arranged above the pair of the first main body rubbers 13a and 13b and the first end member 17, but the first A configuration in which the two main body rubbers 30 and the outer plate member 19 are arranged below the pair of the first main body rubbers 13a and 13b and the second end member 18 may be adopted.
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 configuration in which the connected portion 35 is arranged on the upper end surface of the first mounting protrusion 24 is shown, but on the upper end surface of the first mounting protrusion 24, for example, the first flange portion 17a or the like is shown. The configuration in which is arranged may be adopted.

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 has been shown to include the elastic portion 32 and the rigid body portion 33, but the present invention is not limited to this aspect, and for example, a configuration including only the rigid body portion may be adopted. ..
Further, the restriction 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 main body 34.

The anti-vibration device 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 or bush for a vehicle, a mount of a generator mounted on a construction machine, or a mount of a machine installed in a factory or the like.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate 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 body rubber 14 Liquid chamber 15 Partition member 19 Outer plate member 19a Inner part 19c Circular top wall 19d Inner cylinder part 19f Receiving plate part 21 Restricted passage 26 1st Liquid chamber 27 2nd liquid chamber 30 2nd body rubber 41 Bound stopper O Center axis

Claims (4)

A tubular 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 sandwiches the radial inner portion of the outer plate member in the axial direction with the rubber of the first main body.
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 plate member has an annular top wall whose front and back surfaces face in the axial direction and a radial inner end portion of the annular top wall toward the rubber side of the first main body along the axial direction. A vibration isolator including an inner cylinder portion extending and a receiving plate portion extending inward in the radial direction from an end portion of the inner cylinder portion on the rubber side of the first main body along the axial direction. The anti-vibration device according to claim 1, wherein the connecting portion between the inner cylinder portion and the receiving plate portion is curved so as to project outward in the radial direction. The prevention according to claim 1 or 2, wherein the protruding length of the receiving plate portion from the inner peripheral surface of the inner cylinder portion toward the inside in the radial direction is smaller than the radial width of the annular top wall. Shaking device. Of the pair of the 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 second main body rubber The prevention according to any one of claims 1 to 3, wherein the outer surface facing the axial direction is inclined with respect to both the radial direction and the axial direction in a vertical cross-sectional view along the axial direction. Shaking device.

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