JP6628693B2 - Anti-vibration device - Google Patents

Description

  The present invention relates to a vibration isolator.

Conventionally, as shown in Patent Literature 1 below, for example, a cylindrical first mounting member connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member connected to the other. There is known an anti-vibration device including an elastic body that connects these two mounting members. The elastic body includes an annular first elastic body and a second elastic body that are arranged at intervals in the axial direction along the central axis of the first mounting member.
A liquid chamber is formed between these two elastic bodies, and a plurality of elastic partition walls for dividing the liquid chamber into a plurality of pressure receiving liquid chambers are arranged at intervals in the circumferential direction. The second mounting member is axially divided into a first divided body in which the inner peripheral edge of the first elastic body is connected, and a second divided body in which the inner peripheral edge of the second elastic body is connected. .
The second mounting member has a mounting hole in which a connecting member that connects the second mounting member to one of the vibration generating unit and the vibration receiving unit is mounted. The mounting hole is formed integrally with the first divided body and the second divided body so as to pass through the respective divided surfaces in the axial direction.

JP 2013-245722 A

  However, in the conventional vibration isolator, since the mounting holes are formed integrally with the first and second divided bodies, for example, when a vibration having a large amplitude is inputted to the vibration isolator, the mounting hole is formed. The liquid in the room enters the mounting hole through between the divided surfaces of the first divided body and the second divided body, and the outside air flows through the mounting hole and between the divided surfaces of the first divided body and the second divided body. There was a risk of entering the room.

  The present invention has been made in view of the above-described circumstances, and provides a vibration damping device capable of preventing liquid in a liquid chamber from entering a mounting hole and preventing outside air from entering a liquid chamber. The purpose is to:

  A cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other, and an elastic body connecting both of these mounting members. The elastic body includes an annular first elastic body and a second elastic body which are arranged at intervals in an axial direction along a center axis of the first mounting member, and a space between these two elastic bodies is provided. A liquid chamber in which a liquid is sealed is formed, and a plurality of elastic partition walls for dividing the liquid chamber into a plurality of pressure receiving liquid chambers are arranged at intervals in a circumferential direction, and the second mounting member is The vibration isolator is divided in the axial direction into a first divided body to which an inner peripheral edge of a first elastic body is connected and a second divided body to which an inner peripheral edge of the second elastic body is connected. The first divided body may include one of the vibration generating unit and the vibration receiving unit. A second connecting member that communicates with a first mounting hole in which a first connecting member to be connected is mounted and a through hole formed in the second divided body and connects the first divided body and the second divided body. Is formed, and the first split body and the second split body are formed by integrally mounting the second connecting member in the through hole and the second mounting hole. The first mounting hole and the second mounting hole are connected to each other, and are not communicated with each other.

  According to the present invention, the first mounting hole in which the first connecting member that connects the first divided body to one of the vibration generating unit and the vibration receiving unit is mounted, and the through hole formed in the second divided body. Since the second mounting hole in which the second connecting member that connects the first divided body and the second divided body is communicated with the hole and is not communicated with each other, the liquid in the liquid chamber is not in communication with the first divided body. It is possible to prevent the divided body and the second divided body from reaching the first mounting hole through each of the divided surfaces, and even if outside air enters the first mounted hole, it reaches the divided surface. Can be prevented. Thus, it is possible to prevent the liquid in the liquid chamber from entering the first mounting hole and prevent outside air from entering the liquid chamber.

  A fitting recess and a fitting protrusion fitted into the fitting recess are formed separately on each of the divided surfaces of the first divided body and the second divided body. May be formed in the fitting recess or the fitting protrusion.

  In this case, since the second mounting hole is formed in the fitting recess or the fitting projection formed on each of the divided surfaces of the first divided body and the second divided body, the fitting recess and the fitting projection are formed. Due to the fitting structure of the parts, a long distance from the liquid chamber to the second mounting hole is secured, and the liquid in the liquid chamber passes between the divided surfaces of the first divided body and the second divided body. It is possible to suppress reaching the second mounting hole.

  Further, a first concave portion extending along the axial direction and opening outward in the axial direction may be formed in the elastic partition wall and the first elastic body.

  In this case, the elastic partition and the first elastic body are formed with the first concave portion that extends in the axial direction and opens toward the outside in the axial direction. It is possible to reduce the reaction force generated when vibration in the direction of compressive deformation is applied, and it is possible to reliably attenuate and absorb the vibration in this direction.

  In the outer peripheral surface of the first divided body, a portion located at a position equivalent to the first recess in both the axial direction and the circumferential direction has a second recess recessed inward in the radial direction. It may be formed.

  In this case, in the outer peripheral surface of the first split body, a second concave portion that is depressed inward in the radial direction is formed at a portion located at a position equivalent to the first concave portion in both the axial direction and the circumferential direction. Therefore, when vibration is applied to the vibration isolator in a direction in which the elastic partition walls are compressed and deformed in the radial direction, it is possible to prevent the outer peripheral surface of the first divided body from abutting against the inner surface of the first concave portion. The vibration in this direction can be further attenuated and absorbed.

  ADVANTAGE OF THE INVENTION According to the vibration isolation device which concerns on this invention, it can prevent that the liquid in a liquid chamber enters into a mounting hole, and the outside air enters into a liquid chamber.

It is a longitudinal section in a position containing an elastic partition of an anti-vibration device concerning one embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the vibration isolator shown in FIG. 1 at a position including a pressure receiving liquid chamber. It is a top view of the flat member of the vibration isolator shown in FIG. FIG. 2 is a cross-sectional view taken along line XX of the vibration isolator illustrated in FIG. 1.

Hereinafter, a liquid-filled type vibration damping device according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a vibration isolator 10 includes a cylindrical first mounting member 11 connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member 12 connected to the other. And elastic members 13 and 14 for elastically connecting the two mounting members 11 and 12 to each other. The elastic bodies 13 and 14 include annular first elastic bodies 13 and second elastic bodies 14 arranged at intervals in the axial direction along the central axis O of the first mounting member 11. Between these elastic bodies 13 and 14, an annular liquid chamber (liquid chamber) 19 in which liquid is sealed is formed, and an elastic partition wall 25 that divides the annular liquid chamber 19 into a plurality of pressure receiving liquid chambers 24 is formed. , Are arranged at intervals in the circumferential direction. Examples of the liquid include ethylene glycol, water, and silicone oil.

Hereinafter, a direction along the central axis O of the first mounting member 11 is referred to as an axial direction. In a plan view as viewed from the axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction orbiting around the central axis O is referred to as a circumferential direction. Here, the second mounting member 12 is formed in a columnar shape, and is disposed coaxially with the central axis O.
The central portion in the axial direction of the first mounting member 11 and the central portion in the axial direction of the second mounting member 12 are located at different positions in the axial direction. Hereinafter, in the axial direction, a side in which the central portion of the first mounting member 11 in the axial direction is located with respect to the central portion of the second mounting member 12 in the axial direction is referred to as one side in the axial direction, and the opposite side is referred to as one side. It is called the other side in the axial direction.
In the installation state in which the vibration isolator 10 is separately connected to the vibration generating unit and the vibration receiving unit, the bound side to which the static load (initial load) is input is the one side, and the bound side of the static load is The rebound side opposite to the input direction is the other side.

  As shown in FIG. 1, a flange 11 a protruding outward in the radial direction is formed at the other end of the first mounting member 11. The flange portion 11a has a rectangular shape in plan view when viewed from the axial direction. At the radially inner end of the opening edge on the other side of the first mounting member 11, a concave portion 11g that opens radially inward is formed. The inner peripheral surface of the first mounting member 11 is covered with a coating film 11b.

The first mounting member 11 has a one-side cylindrical portion 11c located on the one side, and the other having an inner diameter and an outer diameter smaller than the one-side cylindrical portion 11c, located on the other side of the one-side cylindrical portion 11c. And a side tubular portion 11d. An annular rib 11e extending over the entire circumference and protruding outward in the radial direction is provided at a connecting portion between the flange portion 11a and the other cylindrical portion 11d and a connecting portion between the one cylindrical portion 11c and the other cylindrical portion 11d. Are formed respectively. The outer diameter of the one end of the one-side cylindrical portion 11c is increased, and the inner diameter of the one-side end of the other cylindrical portion 11d is reduced.
A plurality of female screw parts 11f for attachment / detachment are formed on the one side cylindrical part 11c at the opening edge on the one side at intervals in the circumferential direction. The first mounting member 11 may have a square shape in a plan view as viewed from the axial direction.

  The outer diameter of the second mounting member 12 is smaller than the inner diameter of the first mounting member 11, and the second mounting member 12 is located radially inside the first mounting member 11. The second mounting member 12 protrudes from the other end of the first mounting member 11 toward the other side. The axial size of the second mounting member 12 is smaller than the axial size of the first mounting member 11.

  The elastic bodies 13 and 14 include an annular first elastic body 13 arranged at intervals in the axial direction, and an annular second elastic body 14 disposed on the one side of the first elastic body 13. Have. The first elastic body 13 and the second elastic body 14 are respectively arranged coaxially with the central axis O. The first elastic body 13 and the second elastic body 14 are formed of an elastic material made of, for example, a rubber material or a synthetic resin material. As shown in FIG. 2, between the first elastic body 13 and the second elastic body 14, an annular liquid chamber 19 in which liquid is sealed is formed.

  The outer peripheral edge of the first elastic body 13 is connected to the inner peripheral surface of the first mounting member 11 via the coating film 11b, and is disposed in the recess 11g of the first mounting member 11. I have. The first elastic body 13 gradually protrudes toward the other side from the outside to the inside in the radial direction, so that the size of the portion located inside in the radial direction along the axial direction increases. The first elastic body 13 closes the opening on the other side of the first mounting member 11.

The outer peripheral edge of the second elastic body 14 is connected to a ring member 20 fitted into the other end of the one-side cylindrical portion 11c of the first mounting member 11.
The second elastic body 14 gradually extends toward the other side from the outside in the radial direction to the inside. Of the outer surface of the second elastic body 14, the defining surface 14a facing the other side and defining the annular liquid chamber 19 is formed in a concave curved shape that is concave toward the one side.

Here, the opening on the one side of the first mounting member 11 is closed by a diaphragm 21. The diaphragm 21 includes a diaphragm rubber 21a and a diaphragm ring 21b embedded in the outer peripheral edge of the diaphragm rubber 21a and fitted into the one end of the first mounting member 11 via the coating film 11b. Have. The diaphragm rubber 21a is formed in an inverted bowl shape that opens toward the one side.
A portion located between the diaphragm 21 and the second elastic body 14 in the first mounting member 11 is a sealed liquid chamber 15.

In the present embodiment, the vibration isolator 10 includes a partition member 18 that partitions the filled liquid chamber 15 into the one side and the other side. The partition member 18 is sandwiched in the axial direction by the diaphragm ring 21b and the ring member 20, and is fitted in the first mounting member 11 via the coating film 11b. In the illustrated example, the partition member 18 includes a first partition member 18a and a second partition member 18b disposed on the one side of the first partition member 18a.
In the filled liquid chamber 15, a portion located between the partition member 18 and the second elastic body 14 is a main liquid chamber 16, and a portion located between the partition member 18 and the diaphragm 21 is a sub liquid chamber 17. Have been. The internal volume of the main liquid chamber 16 changes due to the deformation of the second elastic body 14. The inner volume of the sub liquid chamber 17 changes due to the deformation of the diaphragm rubber 21a of the diaphragm 21.

The main liquid chamber 16 and the sub liquid chamber 17 communicate with each other through orifice passages 22a and 22b. The orifice passages 22 a and 22 b are provided in the partition member 18.
The flow path lengths and flow path cross-sectional areas of the orifice passages 22a and 22b are set (tuned) so that the resonance frequency of the orifice passages 22a and 22b becomes a predetermined frequency. Examples of the predetermined frequency include a frequency of idle vibration (for example, a frequency of 18 Hz to 30 Hz and an amplitude of ± 0.5 mm or less) and a shake vibration having a lower frequency than idle vibration (for example, a frequency of 14 Hz or less, (Amplitude is larger than ± 0.5 mm).

The orifice passage 22 includes a first orifice passage 22a and a second orifice passage 22b having different resonance frequencies. The first orifice passage 22a is formed at a radially central portion of the partition member 18 and penetrates the partition member 18 in the axial direction. The second orifice passage 22b is disposed at a portion of the partition member 18 that is located radially outside the first orifice passage 22a. At least a portion of the second orifice passage 22b extends in the circumferential direction, and has a groove formed on the surface of the second partition member 18b facing the other side, and the back surface of the first partition member 18a facing the one side. , Are defined by
The second orifice passage 22b has a longer passage length and a smaller passage cross-sectional area than the first orifice passage 22a. The first orifice passage 22a and the second orifice passage 22b may have the same resonance frequency as each other, or may be only one of the first orifice passage 22a and the second orifice passage 22b. .

  Here, as shown in FIG. 1, two elastic partition walls 25 disposed between the first elastic body 13 and the second elastic body 14 are provided so as to sandwich the central axis O in the radial direction, and have the same shape and shape. These elastic partition walls 25 divide the annular liquid chamber 19 into two pressure receiving liquid chambers 24 having the same shape and the same size. The pressure receiving liquid chamber 24 is disposed so as to sandwich the central axis O in the radial direction.

The restriction passage 23 is provided between the ring member 20, the partition member 18, and the inner peripheral surface of the first mounting member 11. A pair of the restriction passages 23 are provided so as to individually communicate the pressure receiving liquid chambers 24 and the sub liquid chambers 17, and the pressure receiving liquid chambers 24 communicate with each other through the restriction passage 23 and the sub liquid chamber 17. The flow path length and flow path cross-sectional area of the restriction passage 23 are set (tuned) such that the resonance frequencies of the restriction passage 23 and the sub-liquid chamber 17 become a predetermined frequency. Examples of the predetermined frequency include a frequency of idle vibration, a frequency of shake vibration lower in frequency than idle vibration, and the like.
Note that the number of the restriction passages 23 may be one or two or more. When there are two or more restriction passages 23, the resonance frequencies may be different from each other. Instead of this, for example, the restriction passage 23 directly connects each pressure receiving liquid chamber 24, and is not in communication with the main liquid chamber 16, the sub liquid chamber 17, the first orifice passage 22a, and the second orifice passage 22b. It may be.

  The elastic partition 25 is connected to the first elastic body 13 and is in contact with the second elastic body 14. The elastic partition wall 25 protrudes from the first elastic body 13 toward the second elastic body 14, and gradually increases in size along the axial direction from the inside to the outside in the radial direction. The contact surface 25a facing the one side in the elastic partition wall 25 is formed in the shape of a projecting curved surface projecting toward the one side, and is in liquid-tight contact with the defining surface 14a of the second elastic body 14.

  The size of the elastic partition wall 25 in the radial direction is smaller than the size of the first elastic body 13 in the radial direction from the inner peripheral edge to the outer peripheral edge, and is smaller than the inner peripheral edge of the second elastic body 14 to the outer peripheral edge. It is smaller than the size along the radial direction up to the part. The radial outer end of the elastic partition wall 25 is connected to the coating film 11b. The first elastic body 13, the elastic partition 25, and the coating film 11b are integrally formed.

As shown in FIG. 1, the second mounting member 12 includes a first divided body 26 to which the inner peripheral edge of the first elastic body 13 is connected, and a second divided body to which the inner peripheral edge of the second elastic body 14 is connected. And a body 27 in the axial direction.
The second divided body 27 is formed in a columnar shape arranged coaxially with the central axis O. The outer diameter of the second divided body 27 gradually increases toward one side in the axial direction. Further, a concave portion 27a having a concave curved surface concave toward the other side is formed on the end surface of the second divided body 27 facing the one side.

A peripheral groove 27b opening toward the other side is formed in the outer peripheral edge of the end surface (divided surface) of the second divided body 27 facing the other side. At a radially central portion of the second divided body 27, a through-hole 27c penetrating the second divided body 27 in the axial direction is formed.
A fitting recess 27d that is depressed toward the one side is formed on an end surface of the second divided body 27 facing the other side. The fitting recess 27d is arranged coaxially with the central axis O. The through hole 27c and the fitting recess 27d communicate with each other in the axial direction. The through hole 27c has a smaller diameter than the fitting recess 27d.

An annular bulging portion 26c bulging outward in the radial direction is formed on the outer peripheral surface of the one end portion of the first divided body 26. A fitting projection 26b projecting toward the one side is formed on an end surface (divided surface) of the first divided body 26 facing the one side. The fitting protrusion 26b is disposed coaxially with the center axis O.
The fitting projection 26b is inserted into the fitting recess 27d of the second divided body 27. An axial gap is provided between the end surface of the fitting protrusion 26b facing the one side and the bottom surface of the fitting recess 27d of the second divided body 27. The end face of the first split body 26 facing the one side and the end face of the second split body 27 facing the other side are axially separated from each other, and an annular ring extending in the circumferential direction is provided therebetween. A recess 28 is formed.

Here, the first split body 26 has a first mounting hole 12a in which a first connecting member 29a for connecting the first split body 26 to one of the vibration generating unit and the vibration receiving unit is mounted. A second mounting hole 12b is formed to communicate with the through hole 27c of the two-piece body 27 and to receive a second connecting member 29b for connecting the first and second body members 26 and 27 together.
The first mounting hole 12a is formed on an end face of the first split body 26 facing the other side. The second mounting hole 12b is formed on an end face of the fitting projection 26b of the first split body 26 facing the one side. The first mounting hole 12a and the second mounting hole 12b respectively extend along the axial direction.

  The first divided body 26 and the second divided body 27 are axially connected to each other by integrally attaching the second connecting member 29b to the through hole 27c and the second mounting hole 12b. In the illustrated example, the second connecting member 29b is inserted into the through hole 27c from the one side of the second divided body 27, and is fixed to the second mounting hole 12b. The second mounting member 12 is fixed to one of the vibration generating unit and the vibration receiving unit via the fixing plate 29c.

As shown in FIG. 2, the inner peripheral edges of the first elastic body 13 and the second elastic body 14 are adjacent to each other in the axial direction. The inner peripheral edge of the second elastic body 14 is connected to the outer peripheral surface of the second split body 27 and enters the peripheral groove 27b.
The inner peripheral edge of the first elastic body 13 is connected to the outer peripheral surface of a portion of the first split body 26 located on the one side with respect to the central portion in the axial direction. In the illustrated example, the inner peripheral edge of the first elastic body 13 is axially sandwiched between an end face of the first split body 26 facing the one side and an end face of the second split body 27 facing the other side, It has entered the annular recess 28. The inner peripheral edges of each of the first elastic body 13 and the second elastic body 14 overlap with each other in a liquid-tight manner in the axial direction.

  Here, the vibration isolator 10 includes an opening / closing unit 30 that opens and closes the opening 22c on the side of the sub liquid chamber 17 in the first orifice passage 22a. The opening / closing means 30 is provided between the substrate 31 and the diaphragm 21 at a position away from the diaphragm 21 to the one side, and an airtight expansion / contraction space between the substrate 31 and the substrate 31. And a biasing means 33 for biasing the expanding / contracting film 32 toward the other side and pressing the diaphragm 21 against the peripheral edge of the opening of the first orifice passage 22a in the partition member 18. ing.

The board portion 31 has a circular shape in plan view as viewed from the axial direction. A protruding cylindrical portion 31a that protrudes from the surface of the substrate portion 31 facing the other side toward the other side and forms a topped cylindrical shape is formed at a radially central portion of the substrate portion 31. Outer peripheral portion 31b of radially outer portion of substrate portion 31 is formed thicker than other portions. On the surface of the outer peripheral portion 31b facing the other side, an annular groove 31c depressed to the one side is formed over the entire circumference.
As shown in FIG. 1, a plurality of first mounting holes 31 d that penetrate the substrate portion 31 in the axial direction are formed in the outer peripheral edge portion of the substrate portion 31 at intervals in the circumferential direction. The circumferential position of the first mounting hole 31d is equivalent to the circumferential position of the removable female screw portion 11f of the first mounting member 11.

A ring-shaped flat plate member 34 is disposed on the other side of the substrate section 31. A plurality of second mounting holes 34 a are formed in the outer peripheral edge of the flat plate member 34 at intervals in the circumferential direction.
On the other side of the flat plate member 34, a cylindrical pressing member 35 is provided. At one end of the pressing member 35, a flange portion 35a protruding outward in the radial direction is formed. The opening edge of the other side of the holding member 35 is in contact with the opening edge of the one side of the diaphragm ring 21b of the diaphragm 21, and presses the diaphragm 21 toward the other side. The diaphragm ring 21b is sandwiched in the axial direction by the partition member 18 and the pressing member 35.
The pressing member 35 is fitted into the first mounting member 11 via the coating film 11b. A plurality of third mounting holes 35b are formed in the flange portion 35a of the holding member 35 at intervals in the circumferential direction.

  The expansion / contraction film 32 is formed in a topped cylindrical shape having a flange portion 32a projecting outward in the radial direction at the one end. At the radially outer end of the flange portion 32a, an annular mounting portion 32b protruding outward in the radial direction is continuously provided. The annular mounting portion 32b has a radially inner end connected to a radially outer end of the flange portion 32a, a projecting ridge formed in a curved shape projecting toward the other side, and a diameter of the projecting ridge. A connecting portion protruding radially outward from an outer end in the direction; and an edge protruding toward the one side from a radial outer end of the connecting portion.

The edge of the annular mounting portion 32b is disposed in the annular groove 31c of the substrate 31. Each of the connecting portion and the edge portion of the annular mounting portion 32b is sandwiched between the substrate portion 31 and the flat plate member 34 in the axial direction.
The expansion / contraction film 32 is formed of an elastic material such as a rubber material or a synthetic resin material, and a metal auxiliary fitting 32e is embedded in the top wall 32c, the peripheral wall 32d, and the flange 32a. Thus, the top wall 32c, the peripheral wall 32d, and the flange 32a have a certain rigidity.

  The urging means 33 is a coil spring, into which the protruding cylindrical portion 31a of the substrate portion 31 is inserted. The other end of the urging means 33 is in contact with the back surface of the top wall 32c of the expansion / contraction film 32 that faces the one side, and the one end of the urging unit 33 faces the other side of the substrate unit 31. It is in contact with the surface. Thus, the urging means 33 urges the expansion / contraction film 32 toward the other side.

The board section 31 is detachably attached to the first attachment member 11. The board portion 31 is attached to the first attaching member 11 by screwing the attaching / detaching bolt 40 to the attaching / detaching female screw portion 11f while inserting the attaching / detaching bolt 40 into the first attaching hole 31d, the second attaching hole 34a, and the third attaching hole 35b. It is installed.
The board portion 31 is mounted on the one side opening edge of the first mounting member 11 together with the flat plate member 34 and the pressing member 35.
The opening / closing means 30 and the diaphragm 21 can be removed from the first mounting member 11 by removing all of the detachable bolts 40 from the first mounting member 11. In addition, the board part 31 and the flat plate member 34 may be formed integrally. Further, even if all of the attaching / detaching bolts 40 are removed from the first attaching member 11, the diaphragm 21 and the pressing member 35 may be fixed to the first attaching member 11.

Further, a supply / discharge hole 31 e through which the working fluid is supplied / discharged to the expansion / contraction space A is formed in the substrate portion 31. The supply / discharge hole 31 e is formed at a radially central portion of the projecting cylindrical portion 31 a of the substrate portion 31 and communicates the outside of the vibration isolator 10 with the expansion / contraction space A.
As shown in FIG. 2, between the substrate portion 31 and the first mounting member 11, a communication connecting the internal space B between the expansion / contraction film 32 and the diaphragm 21 and the outside of the vibration isolator 10. A passage 34b is formed. The communication passage 34b is formed on the surface of the flat plate member 34 facing the other side.

  As shown in FIG. 3, a plurality of communication passages 34b are formed at intervals in the circumferential direction. In the illustrated example, four communication paths 34b are formed. The communication passage 34b has a rectangular shape that is long in the radial direction in plan view as viewed from the axial direction. As shown in FIG. 2, the radial inner end of the communication passage 34 b is located radially inward of the inner peripheral edge of the holding member 35. The radial outer end of the communication passage 34b is located at the outer peripheral edge of the holding member 35, and the communication passage 34b is opened radially outward.

In the diaphragm 21, a facing portion 21 c of the first orifice passage 22 a facing the opening 22 c of the auxiliary liquid chamber 17 is in contact with the expansion / contraction film 32 via the spacer 36. The spacer 36 is a circular plate material and is made of metal. The spacer 36 and the top wall 32c of the expansion / contraction film 32 are disposed coaxially with the central axis O. The outer diameter of the spacer 36 is larger than the outer diameter of the top wall 32c of the expansion / contraction film 32. The shape of the spacer 36 is not limited to a circular shape.
The facing portion 21c of the diaphragm 21 is formed thicker than other portions. The facing portion 21c has a circular shape in plan view as viewed from the axial direction.

The size (thickness) of the facing portion 21c in the axial direction is equal over the entire area of the facing portion 21c. The outer peripheral edge of the opposing portion 21c is in contact with the partition member 18, and the center in the radial direction is in contact with or close to the partition member 18. In the illustrated example, on the surface of the facing portion 21c facing the other side, an abutting ring portion 21d protruding toward the other side is formed at an outer peripheral edge portion, and the other end portion is formed at a radial center portion. A contact protrusion 21e protruding toward the side is formed.
The opposing portion 21c of the diaphragm 21 is urged toward the other side by the urging means 33, and the contact ring 21d is pressed against the peripheral edge of the opening of the first orifice passage 22a of the partition member 18 to come into contact therewith. I have. Further, the contact protrusion 21e is in contact with or close to the rib 22d of the partition member 18 disposed in the opening 22c in the axial direction.

The opening 22c of the first orifice passage 22a on the side of the auxiliary liquid chamber 17 is located radially inward of the spacer 36 in plan view as viewed from the axial direction. Furthermore, in a plan view seen from the axial direction, the opening 22c is located radially inward of the facing portion 21c. In the illustrated example, the opening 22c, the opposing portion 21c, and the spacer 36 are disposed coaxially with the central axis O, and the inner diameter L of the opening 22c is smaller than the outer diameter of the opposing portion 21c and the spacer 36. .
Further, the inner diameter L of the opening 22 c is larger than the outer diameter of the urging means 33 in a plan view viewed from the axial direction.

  In the present embodiment, the first mounting hole 12a and the second mounting hole 12b formed in the first divided body 26 of the second mounting member 12 are not in communication with each other. In the portion of the first split body 26 located between the first mounting hole 12a and the second mounting hole 12b, a partition wall portion 12c that axially separates the inside of each of the first mounting hole 12a and the second mounting hole 12b. Is formed.

In the present embodiment, the first partition 25b that extends in the axial direction and opens outward in the axial direction is formed in the elastic partition wall 25 and the first elastic body 13. Two first concave portions 25b are formed so as to sandwich the second mounting member 12 in the radial direction, and are formed at respective radially central portions of the elastic partition walls 25.
As shown in FIG. 4, the first recess 25b has a circular shape in plan view when viewed from the axial direction. As shown in FIG. 1, the size (depth) in the axial direction of the first recess 25b is larger than the size (inner diameter) in the radial direction. The axial position of the one end of the first concave portion 25b is located on the one side with respect to the annular concave portion 28, and is located on the other side with the concave portion 27a of the second divided body 27. ing.

Further, in the present embodiment, a portion of the outer peripheral surface of the first divided body 26 which is located at a position equivalent to the first concave portion 25b in both the axial direction and the circumferential direction has a concave portion inward in the radial direction. Two concave portions 26d are formed.
The second concave portion 26d is formed in the annular bulging portion 26c of the first divided body 26. The second concave portion 26d has an arc shape in plan view as viewed from the axial direction, and extends along the axial direction. The inner peripheral surface of the second concave portion 26d is the same peripheral surface as the inner peripheral surface of the first concave portion 25b. Instead of this, the inner peripheral surface of the second concave portion 26d may be located slightly inward in the radial direction from the inner peripheral surface of the first concave portion 25b, and may be covered by the first elastic body 13.

Next, an operation of the vibration isolator 10 configured as described above will be described.
The vibration isolator 10 is of a compression type (an upright type) which is mounted such that the main liquid chamber 16 is located on the upper side in the vertical direction and the sub liquid chamber 17 is located on the lower side in the vertical direction.
For example, when the vibration isolator 10 is mounted as a cab mount on an automobile, the first mounting member 11 is connected to a ladder frame as a vibration generating unit, while being connected to the second mounting member 12 via a fixing plate 29c. A cabin as a vibration receiving unit is connected. The vibration isolator 10 is mounted such that, among the radial directions, the parallel direction in which the pressure-receiving liquid chambers 24 are arranged across the central axis O coincides with, for example, the front-back direction or the left-right direction. Note that the vibration isolator 10 may be used as an engine mount.

  In the vibration isolator 10, when the axial vibration is input and the first mounting member 11 and the second mounting member 12 are relatively displaced in the axial direction, the first mounting member 11 and the second mounting member 12 are connected to each other. The second elastic body 14 elastically deforms. Then, the volume of the main liquid chamber 16 changes, and liquid flows between the main liquid chamber 16 and the sub liquid chamber 17 through the first orifice passage 22a and the second orifice passage 22b, and the first orifice passage 22a and the second orifice Liquid column resonance occurs in the passage 22b, and vibration having a frequency equal to the resonance frequency of each of the first orifice passage 22a and the second orifice passage 22b is attenuated and absorbed.

  Further, when the radial vibration is input and the first mounting member 11 and the second mounting member 12 are relatively displaced in the radial direction, the first elastic body 13, the second elastic body 14, and the elastic partition 25 are elastically deformed. I do. Then, the volume of each pressure receiving liquid chamber 24 changes, and liquid flows between the respective pressure receiving liquid chambers 24 through the restriction passage 23 and the sub liquid chamber 17, and a liquid column resonance occurs in the restriction passage 23, and the resonance of the restriction passage 23 occurs. Vibration of the same frequency as the frequency is attenuated and absorbed.

Here, when the vibration generating section is driven and idle vibration is input, the inside of the expansion / contraction space A is exhausted through the supply / discharge hole 31 e to a negative pressure by the supply / discharge means (not shown), and the pressure is applied to the other side of the biasing means 33. The expansion / contraction film 32 is contracted against the urging force, and the pushing of the diaphragm 21 toward the other side by the expansion / contraction film 32 is released. As a result, the contact ring 21d of the diaphragm 21 is not pressed against the opening peripheral edge of the first orifice passage 22a of the partition member 18, and the first orifice passage 22a is opened.
Then, the liquid flows through the first orifice passage 22a having a lower flow resistance than the second orifice passage 22b to cause liquid column resonance, and the input idle vibration is attenuated and absorbed.

On the other hand, when the vibration generating unit is driven and shake vibration is input, the inside of the expansion / contraction film 32 is returned to the atmospheric pressure by, for example, supplying air into the expansion / contraction space A through the supply / discharge hole 31e. By expanding the expansion / contraction film 32 by the urging force directed to the other side, the diaphragm 21 is pushed up by the expansion / contraction film 32 toward the other side. As a result, the contact ring 21d of the diaphragm 21 is pressed against the peripheral edge of the opening of the first orifice passage 22a, and closes the opening of the first orifice passage 22a toward the auxiliary liquid chamber 17 side.
Then, the liquid flows through the second orifice passage 22b to cause liquid column resonance, and the input shake vibration is attenuated and absorbed.

  As described above, according to the vibration isolator 10 of the present invention, the first connecting member 29a for connecting the first split body 26 to one of the vibration generating unit and the vibration receiving unit is mounted. A second mounting hole that communicates with the first mounting hole 12a and the through hole 27c formed in the second divided body 27, and in which a second connecting member 29b that connects the first divided body 26 and the second divided body 27 is mounted. 12b are not communicated with each other, so that the liquid in the liquid chamber 19 is prevented from reaching the first mounting hole 12a through between the divided surfaces of the first divided body 26 and the second divided body 27. Further, even if outside air enters the first mounting hole 12a, it is possible to prevent the outside air from reaching the division surface. Thus, it is possible to prevent the liquid in the liquid chamber 19 from entering the first mounting hole 12a and prevent outside air from entering the liquid chamber 19.

  Further, since the second mounting hole 12b is formed in the fitting recess 27d or the fitting projection 26b formed on each of the divided surfaces of the first divided body 26 and the second divided body 27, the fitting recess 27d and the fitting recess 27d are formed. Due to the fitting structure of the fitting projection 26b, a long distance from the liquid chamber 19 to the second mounting hole 12b is ensured, and the liquid in the liquid chamber 19 is separated from the first divided body 26 and the second divided body. It is possible to suppress reaching the second mounting hole 12b through between the divided surfaces of the divided body 27.

  Further, the first partition 25b extending in the axial direction and opening outward in the axial direction is formed in the elastic partition 25 and the first elastic body. It is possible to reduce the reaction force generated when vibration in the direction of compressive deformation in the radial direction is applied, and it is possible to reliably attenuate and absorb the vibration in this direction.

  In the outer peripheral surface of the first split body 26, a second concave portion 26d that is depressed inward in the radial direction is formed in a portion located at a position equivalent to the first concave portion 25b in both the axial direction and the radial direction. When the vibration is applied to the vibration isolating device 10 in a direction in which the elastic partition wall 25 is compressed and deformed in the radial direction, the first divided body 26 is prevented from hitting the inner surface of the first concave portion 25b. And vibration in this direction can be further attenuated and absorbed.

Note that the technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, in the above embodiment, a fitting projection 26b is formed on the end face of the first divided body 26 facing the one side, and a fitting recess 27d is formed on the end face of the second divided body 27 facing the other side. Although the configuration described above has been described, the present invention is not limited to such an embodiment. The fitting recesses and the fitting protrusions fitted in the fitting recesses may not be separately formed on each of the divided surfaces of the first divided body and the second divided body.

Further, in the above embodiment, the configuration in which the first concave portion 25b is formed in the elastic partition wall 25 has been described, but the present invention is not limited to such a mode. The first recess may not be formed in the elastic partition.
Further, in the above-described embodiment, the configuration in which the second concave portion 26d is formed in the first divided body 26 has been described, but the present invention is not limited to such a configuration. The second recess may not be formed in the first divided body.

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-described modifications may be appropriately combined.

Reference Signs List 10 Anti-vibration device 11 First mounting member 12 Second mounting member 13 First elastic body 14 Second elastic body 15 Enclosed liquid chamber 19 Annular liquid chamber (liquid chamber)
23 Restriction passage 24 Pressure receiving liquid chamber 25 Elastic partition wall 25b First concave portion 26 First divided body 26b Fitting projection 26d Second concave portion 27 Second divided body 27c Through hole 27d Fitting concave portions 29a, 29b Connecting member O Center axis

Claims (4)

A first cylindrical mounting member connected to one of the vibration generating unit and the vibration receiving unit, and a second mounting member connected to the other;
An elastic body that connects these two mounting members,
The elastic body includes an annular first elastic body and a second elastic body arranged at intervals in an axial direction along a central axis of the first mounting member,
A liquid chamber filled with liquid is formed between these two elastic bodies, and a plurality of elastic partition walls dividing the liquid chamber into a plurality of pressure receiving liquid chambers are arranged at intervals in the circumferential direction. ,
The second mounting member includes a first divided body having an inner peripheral edge of the first elastic body connected thereto, and a second divided body having an inner peripheral edge of the second elastic body connected thereto in the axial direction. A divided vibration isolator,
A first mounting hole in which a first connection member for connecting the first divided body to one of the vibration generating unit and the vibration receiving unit is mounted; A second mounting hole in which a second connecting member that connects to the first divided body and the second divided body is mounted to communicate with the formed through hole, and
By mounting the second connecting member integrally with the through hole and the second mounting hole, the first divided body and the second divided body are connected to each other,
The first mounting hole and the second mounting hole are not communicated with each other. A fitting recess and a fitting protrusion fitted into the fitting recess are formed on each of the divided surfaces of the first and second divided bodies,
The vibration isolator according to claim 1, wherein the second mounting hole is formed in the fitting recess or the fitting protrusion.   The said elastic partition and the said 1st elastic body are formed along the said axial direction, and the 1st recessed part opened toward the outside of the said axial direction is formed. Anti-vibration device as described.   In the outer peripheral surface of the first split body, a second concave portion that is depressed inward in the radial direction is formed in a portion located at a position equivalent to the first concave portion in both the axial direction and the circumferential direction. The anti-vibration device according to claim 3, wherein:

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