Vibration isolation device

Abstract

A vibration isolation device (1, 101), wherein a partition member (16) is provided with a throttling passage (24) connecting a main liquid chamber (14) and a secondary liquid chamber (15), a plurality of first connecting holes (42a) connecting the main liquid chamber and a storage chamber (42), and a second connecting hole (42b) connecting the secondary liquid chamber and the storage chamber, and a first wall (16b) of the partition member, which is provided with the first connecting holes and constitutes a part of the inner surface of the main liquid chamber, is provided with a spring directed toward an elastic body ( 13) A cylindrical member (21) protruding in the axial direction, a plurality of first communicating holes opening in the first wall surface, an inner portion (16f) located on the inner side of the cylindrical member and an outer portion (16g) located on the outer side of the cylindrical member, and a partition member (16, 116) or a movable member (141) including a flow state adjustment portion (50, 150) for adjusting the flow of fluid between the outer peripheral surface of the cylindrical member (21) and the inner peripheral surface of the main liquid chamber (14).

Description

Technical Field

[0001] The present invention relates to a vibration isolating device which is applied to, for example, automobiles, industrial machinery, etc., and absorbs and attenuates vibrations of a vibration generating part such as an engine.

[0002] This application claims priority based on Japanese Patent Application No. 2019-202575 filed in Japan on November 7, 2019, Japanese Patent Application No. 2019-202578 filed in Japan on November 7, 2019, and Japanese Patent Application No. 2019-202592 filed in Japan on November 7, 2019, the contents of which are incorporated herein by reference. Background Art

[0003] As such a vibration isolation device, a structure is conventionally known, which includes: a first mounting member and a second mounting member, the first mounting member being cylindrical and connected to either a vibration generating part or a vibration receiving part, and the second mounting member being connected to the other of the vibration generating part and the vibration receiving part; an elastomer which elastically connects the above-mentioned two mounting members; a partitioning member which divides a liquid chamber in the first mounting member sealed with a liquid into an auxiliary liquid chamber and a main liquid chamber having an elastomer in a part of the partition wall; and a movable member which is accommodated in a storage chamber provided in the partitioning member in a deformable or displaceable manner, and the partitioning member is provided with a throttling passage connecting the main liquid chamber and the auxiliary liquid chamber, a plurality of first connecting holes connecting the main liquid chamber and the storage chamber, and a second connecting hole connecting the auxiliary liquid chamber and the storage chamber. In this vibration isolation device, when a relatively high-frequency idle vibration among low-frequency vibrations with a frequency of less than 200 Hz is input in the axial direction, the liquid in the liquid chamber is circulated in the first connecting hole and the second connecting hole while the movable component is deformed or displaced in the storage chamber, thereby attenuating and absorbing the idle vibration. In addition, when a relatively low-frequency swing vibration is input in the axial direction, the liquid in the liquid chamber is circulated in the throttling passage, thereby attenuating and absorbing the swing vibration.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-327789 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, the conventional vibration isolation device cannot attenuate or absorb medium-frequency vibrations of 200 Hz to 1000 Hz.

[0009] The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to provide a vibration isolation device capable of attenuating and absorbing medium-frequency vibrations.

[0010] Solutions for solving problems

[0011] The first technical solution of the vibration isolation device of the present invention is a vibration isolation device, which includes: a first mounting member and a second mounting member, the first mounting member is cylindrical and connected to any one of the vibration generating part and the vibration receiving part, and the second mounting member is connected to the other of the vibration generating part and the vibration receiving part; an elastic body, which elastically connects the above-mentioned two mounting members; a partitioning member, which divides the liquid chamber in the first mounting member sealed with liquid into an auxiliary liquid chamber and a main liquid chamber having the elastic body in a part of the partition wall in the axial direction along the central axis of the first mounting member; and a movable member, which is accommodated in a storage chamber provided in the partitioning member in a deformable or displaceable manner, and the partitioning member is provided with a storage chamber for displacing the liquid A throttling passage connecting the main liquid chamber and the auxiliary liquid chamber, a plurality of first connecting holes connecting the main liquid chamber and the storage chamber, and a second connecting hole connecting the auxiliary liquid chamber and the storage chamber, a cylindrical member protruding along the axial direction toward the elastomer is arranged on the first wall surface of the partition member, which is provided with the first connecting holes and constitutes a part of the inner surface of the main liquid chamber, and the plurality of first connecting holes are opened in both the inner part located on the inner side of the cylindrical member and the outer part located on the outer side of the cylindrical member in the first wall surface, and the partition member or the movable member includes a flow state adjustment part for adjusting the flow of the fluid between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the main liquid chamber.

[0012] Effects of the Invention

[0013] According to the present invention, medium-frequency vibration can be attenuated and absorbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a longitudinal sectional view of the vibration isolation device according to the first embodiment of the present invention.

[0015] Figure 2 yes Figure 1 A cross-sectional view of the vibration isolation device taken along line A-A is shown.

[0016] Figure 3 It is a longitudinal sectional view of a vibration isolation device according to a second embodiment of the present invention.

[0017] Figure 4 yes Figure 3 A cross-sectional view of the vibration isolation device as viewed along line BB is shown.

[0018] Figure 5 It is a longitudinal sectional view of a vibration isolation device according to a third embodiment of the present invention.

[0019] Figure 6 yes Figure 5 A cross-sectional view of the vibration isolation device taken along line A-A is shown.

[0020] Figure 7 It is a longitudinal sectional view of a vibration isolation device according to a fourth embodiment of the present invention.

[0021] Figure 8 It is a longitudinal sectional view of a vibration isolation device according to a fifth embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following is based on Figure 1 and Figure 2 A first embodiment of the vibration isolation device of the present invention will be described.

[0023] like Figure 1 As shown, the vibration isolation device 1 is a liquid-sealed vibration isolation device, which includes: a first mounting member 11 and a second mounting member 12, the first mounting member 11 is cylindrical and connected to any one of the vibration generating part and the vibration receiving part, and the second mounting member 12 is connected to the other of the vibration generating part and the vibration receiving part; an elastomer 13, which elastically connects the first mounting member 11 and the second mounting member 12 to each other; a partition member 16, which divides the liquid chamber 19 in the first mounting member 11 sealed with liquid into an auxiliary liquid chamber 15 and a main liquid chamber 14 having the elastomer 13 in a part of the partition wall; and a movable member 41, which is housed in a housing chamber 42 provided in the partition member 16 in a deformable or displaceable manner.

[0024] Hereinafter, the direction along the central axis O of the first mounting member 11 is referred to as the axial direction. In addition, the side where the second mounting member 12 is located in the axial direction is referred to as the upper side, and the side where the partition member 16 is located is referred to as the lower side. In addition, when the vibration isolation device 1 is viewed from above from the axial direction, the direction intersecting the central axis O is referred to as the radial direction, and the direction surrounding the central axis O is referred to as the circumferential direction. In addition, the first mounting member 11, the second mounting member 12, and the elastic body 13 are each circular or annular in a plan view, and are arranged coaxially with the central axis O.

[0025] When the vibration isolating device 1 is installed in a car, for example, the second mounting member 12 is connected to the engine or the like as a vibration generating part, and the first mounting member 11 is connected to the vehicle body as a vibration receiving part. Thus, the transmission of the vibration of the engine or the like to the vehicle body is suppressed. Alternatively, the first mounting member 11 may be connected to the vibration generating part, and the second mounting member 12 may be connected to the vibration receiving part.

[0026] The first mounting member 11 includes an inner tube portion 11a, an outer tube portion 11b, and a lower support portion 11c. The inner tube portion 11a is fitted into the outer tube portion 11b. The lower support portion 11c is formed in an annular shape. The lower end opening edge of the outer tube portion 11b is placed on the upper surface of the outer peripheral portion of the lower support portion 11c. The first mounting member 11 is formed in a cylindrical shape as a whole. The first mounting member 11 is connected to a vehicle body or the like as a vibration receiving portion by means of a bracket not shown in the figure.

[0027] The second mounting member 12 is located radially inside and above the first mounting member 11. The outer diameter of the second mounting member 12 is smaller than the inner diameter of the first mounting member 11. The second mounting member 12 is engaged with the inner side by a mounting metal fitting not shown in the figure and is connected to an engine or the like as a vibration generating part by means of the mounting metal fitting. In addition, the relative positions of the first mounting member 11 and the second mounting member 12 are not limited to the example shown in the figure, and can also be appropriately changed. In addition, the outer diameter of the second mounting member 12 can also be set to be greater than the inner diameter of the first mounting member 11.

[0028] The elastic body 13 is formed into a cylindrical shape extending in the axial direction. The elastic body 13 expands in diameter from the top to the bottom. The first mounting member 11 and the second mounting member 12 are connected to the two axial ends of the elastic body 13, respectively. The second mounting member 12 is connected to the upper end of the elastic body 13, and the first mounting member 11 is connected to the lower end of the elastic body 13. The elastic body 13 closes the upper end opening of the first mounting member 11. The lower end of the elastic body 13 is connected to the inner circumferential surface of the inner tube portion 11a of the first mounting member 11. The upper end of the elastic body 13 is connected to the lower surface of the second mounting member 12. The elastic body 13 is formed of a rubber material or the like, and is vulcanized and bonded to the first mounting member 11 and the second mounting member 12. The thickness of the elastic body 13 becomes thinner from the top to the bottom. In addition, the elastic body 13 can also be formed of, for example, a synthetic resin material or the like. A stopper rubber 13a covering the outer peripheral surface and the upper surface of the second mounting member 12 is integrally formed at the upper end of the elastic body 13. An outer housing 12a surrounding the second mounting member 12 is embedded in the elastic body 13 and the stopper rubber 13a.

[0029] The diaphragm 20 is formed of an elastic material such as rubber or soft resin and is formed into a bottomed cylindrical shape. The upper end of the diaphragm 20 is sandwiched between the inner circumference of the lower support portion 11c of the first mounting member 11 and the outer circumference of the partition member 16, thereby ensuring the liquid tightness of the inner side of the diaphragm 20 and closing the lower end opening of the first mounting member 11.

[0030] In the example shown in the figure, the bottom of the diaphragm 20 is deep on the outer peripheral side and shallow in the center. However, as the shape of the diaphragm 20, various shapes known in the art can be adopted besides this shape.

[0031] The lower end opening of the first mounting member 11 is closed by the diaphragm 20, and the upper end opening of the first mounting member 11 is closed by the elastic body 13 as described above, so that the first mounting member 11 forms a liquid chamber 19 which is sealed liquid-tightly. A liquid is sealed (filled) in the liquid chamber 19. Examples of the liquid include ethylene glycol, water, and silicone oil.

[0032] The liquid chamber 19 is divided into a main liquid chamber 14 and a sub-liquid chamber 15 in the axial direction by a partition member 16. The main liquid chamber 14 has an inner peripheral surface 13c of the elastic body 13 in a part of the wall surface, and is a space surrounded by the elastic body 13 and the partition member 16, and the inner volume changes according to the deformation of the elastic body 13. The sub-liquid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16, and the inner volume changes according to the deformation of the diaphragm 20. The vibration isolation device 1 having such a structure is a compression type device installed and used in a manner that the main liquid chamber 14 is located on the upper side in the vertical direction and the sub-liquid chamber 15 is located on the lower side in the vertical direction.

[0033] The partition member 16 is provided with a plurality of first communicating holes 42a that connect the main liquid chamber 14 and the storage chamber 42, and a second communicating hole 42b that connects the auxiliary liquid chamber 15 and the storage chamber 42. The partition member 16 is provided with a plurality of second communicating holes 42b, and the number of the first communicating holes 42a and the number of the second communicating holes 42b are the same. Each of the first communicating holes 42a and the second communicating holes 42b is opposite to each other in the axial direction. The inner diameters (cross-sectional areas of the flow paths) of the first communicating holes 42a and the second communicating holes 42b that are opposite to each other in the axial direction are the same. The flow path lengths of the first communicating holes 42a and the second communicating holes 42b that are opposite to each other in the axial direction are the same. In addition, one second communicating hole 42b may also be formed in the partition member 16.

[0034] Here, in the partition member 16, the upper wall surface constituting a part of the inner surface of the main liquid chamber 14 and the lower wall surface constituting a part of the inner surface of the auxiliary liquid chamber 15 are respectively in a circular shape arranged coaxially with the central axis O when viewed from the axial direction. The diameters of the upper wall surface and the lower wall surface of the partition member 16 are equal to each other. The upper wall surface of the partition member 16 is opposite to the inner peripheral surface 13c of the elastic body 13 in the axial direction, and the lower wall surface of the partition member 16 is opposite to the inner surface of the diaphragm 20 in the axial direction.

[0035] In the example shown in the figure, a concave portion is provided in the entire area of ​​the upper wall surface of the partition member 16 except the peripheral portion 16a. A plurality of first connecting holes 42a are opened in the entire area of ​​the bottom surface (hereinafter referred to as the first wall surface) 16b of the concave portion. A concave portion is provided in the entire area of ​​the lower wall surface of the partition member 16 except the peripheral portion 16c. A plurality of second connecting holes 42b are opened in the entire area of ​​the bottom surface (hereinafter referred to as the second wall surface) 16d of the concave portion. The concave portions of the upper wall surface and the lower wall surface are each in a circular shape coaxially arranged with the central axis O when viewed from the axial direction, and the inner diameter and depth of each concave portion are equal to each other.

[0036] The storage chamber 42 is provided in the axial portion between the first wall surface 16b and the second wall surface 16d in the partition member 16. The storage chamber 42 is in a circular shape coaxially arranged with the central axis O when viewed from the axial direction. The diameter of the storage chamber 42 is larger than the diameter of each of the first wall surface 16b and the second wall surface 16d. The movable member 41 is formed in a plate shape with the front and back sides facing the axial direction. The movable member 41 is in a circular shape coaxially arranged with the central axis O when viewed from the axial direction. The movable member 41 is formed of an elastic material such as rubber or soft resin.

[0037] The partition member 16 is provided with a throttle passage 24 that connects the main liquid chamber 14 and the auxiliary liquid chamber 15. The throttle passage 24 is provided in the axial portion between the outer peripheral edge portion 16a of the upper wall surface and the outer peripheral edge portion 16c of the lower wall surface in the partition member 16. The upper end of the throttle passage 24 is located above the first wall surface 16b, and the lower end of the throttle passage 24 is located below the second wall surface 16d. The flow path cross-sectional shape of the throttle passage 24 is a rectangular shape that is long in the axial direction. The resonance frequency of the throttle passage 24 is lower than the resonance frequency of each of the first connecting hole 42a and the second connecting hole 42b.

[0038] like Figure 2 As shown, the opening 25 of the main liquid chamber 14 side of the throttling passage 24 is provided at the outer peripheral edge 16a of the upper wall surface of the partition member 16. The opening 25 is formed by arranging a plurality of through holes 25a at intervals in the circumferential direction, and a plurality of hole rows 25b are arranged in a manner that each position in the radial direction and the circumferential direction is different. The inner diameter of the through hole 25a is smaller than the inner diameter of the first connecting hole 42a. Two hole rows 25b are arranged at the outer peripheral edge 16a of the upper wall surface of the partition member 16. The circumferential offset of each hole row 25b and the radial offset of each hole row 25b are respectively equal to the inner diameter of the through hole 25a.

[0039] The opening portion of the throttle passage 24 on the auxiliary liquid chamber 15 side is provided at the outer peripheral edge portion 16c of the lower wall surface of the partition member 16, and is an opening having an opening area larger than the opening area of ​​the opening portion 25 on the main liquid chamber 14 side, that is, the total opening area of ​​the plurality of through holes 25a. The opening portion 25 on the main liquid chamber 14 side and the opening portion on the auxiliary liquid chamber 15 side of the throttle passage 24 are located radially outward of the first communicating hole 42a and the second communicating hole 42b.

[0040] A flange portion 16e is provided at the upper end of the partition member 16. The flange portion 16e protrudes outward in the radial direction and extends continuously over the entire circumference. The upper surface of the flange portion 16e abuts against the lower end opening edges of the inner tube portion 11a and the outer tube portion 11b of the first mounting member 11 via an annular upper side sealing material 27. The lower surface of the flange portion 16e abuts against the upper surface of the inner circumference of the lower support portion 11c of the first mounting member 11 via the upper end opening edge of the diaphragm 20 and an annular lower side sealing material 28 surrounding the upper end opening edge of the diaphragm 20 from the radial outer side.

[0041] The partition member 16 includes an upper cylinder 31 and a lower cylinder 32 disposed so as to abut against each other in the axial direction, an upper wall 33 closing the lower end opening of the upper cylinder 31, and a lower wall 34 closing the upper end opening of the lower cylinder 32. Alternatively, the partition member 16 may be formed integrally.

[0042] The upper end opening edge of the upper cylinder 31 is the outer peripheral edge portion 16a of the upper wall surface of the aforementioned partition member 16. A flange portion 16e is provided at the upper end portion of the upper cylinder 31. A circumferential groove is provided at a portion of the lower end opening edge of the upper cylinder 31 that is located radially outward relative to the inner circumference, and the circumferential groove is recessed upward and opens radially outward. The upper wall 33 is fixed to the inner circumference of the lower end opening edge of the upper cylinder 31. The first connecting hole 42a is provided on the upper wall 33.

[0043] A circumferential groove recessed downward is provided in the radial middle portion of the upper end opening edge of the lower cylinder 32, which is axially opposite to the circumferential groove of the upper cylinder 31. The throttling passage 24 is formed by dividing the circumferential groove and the circumferential groove of the upper cylinder 31. The outer peripheral edge portion of the upper end opening edge of the lower cylinder 32, which is located radially outside the circumferential groove, abuts against the lower surface of the flange portion 16e of the upper cylinder 31. The lower cylinder 32 is embedded in the upper end portion of the diaphragm 20, and the upper end portion of the diaphragm 20 is embedded in the lower support portion 11c of the first mounting member 11. As a result, the upper end portion of the diaphragm 20 is clamped in the radial direction by the outer peripheral surface of the lower cylinder 32 and the inner peripheral surface of the lower support portion 11c. The lower wall 34 is fixed to the inner peripheral portion of the upper end opening edge of the lower cylinder 32. The second connecting hole 42b is provided in the lower wall 34.

[0044] At least one of the inner circumference of the lower end opening edge of the upper cylinder 31 and the inner circumference of the upper end opening edge of the lower cylinder 32 is provided with abutment protrusions 34a, 34b that protrude toward the other and abut against the other. In the illustrated example, both the inner circumference of the lower end opening edge of the upper cylinder 31 and the inner circumference of the upper end opening edge of the lower cylinder 32 are provided with abutment protrusions 34a, 34b. The abutment protrusions 34a, 34b are formed into an annular shape coaxially arranged with the central axis O, and the upper wall 33 and the lower wall 34 are arranged on the radial inner side of the abutment protrusions 34a, 34b in a state of being spaced apart from each other in the axial direction. The storage chamber 42 is divided and formed by the lower surface of the upper wall 33, the upper surface of the lower wall 34, and the inner circumferential surface of the abutment protrusions 34a, 34b.

[0045] Furthermore, in the present embodiment, a cylindrical member 21 is disposed on the first wall surface 16 b of the partition member 16 , which has the first communication hole 42 a and constitutes a part of the inner surface of the main liquid chamber 14 , and projects in the axial direction toward the elastic body 13 .

[0046] The cylindrical member 21 is formed in a cylindrical shape and is arranged coaxially with the central axis O. The cylindrical member 21 extends straight in the axial direction. The axial length of the cylindrical member 21 is more than 20% of the maximum axial height T of the main liquid chamber 14. In the illustrated example, the maximum axial height T of the main liquid chamber 14 is the axial distance between the upper end of the inner circumferential surface 13c of the elastomer 13 and the first wall surface 16b extending radially inward from the bottom to the top. The axial length of the cylindrical member 21 is set so that the upper end of the cylindrical member 21 does not abut against the inner circumferential surface 13c of the elastomer 13 when an axial static load is applied to the vibration isolation device 1 and when an axial vibration is input. In addition, as mentioned above, the inner circumferential surface 13c of the elastomer 13 is a portion extending radially inward from the bottom to the top. As in the example shown in the figure, when the upper end portion of the inner surface of the elastomer 13 that divides and forms the main liquid chamber 14 is provided with a recessed pit portion recessed upward, the upper end portion of the inner circumferential surface 13c of the elastomer 13 refers to the opening peripheral edge portion of the recessed pit portion on the inner surface of the elastomer 13.

[0047] The upper part of the cylindrical member 21 protrudes upward from the upper end opening of the concave portion provided on the upper wall surface of the partition member 16. The outer peripheral surface of the upper part of the cylindrical member 21 is radially opposite to the lower end of the inner peripheral surface of the inner cylindrical portion 11a of the first mounting member 11 and the lower end of the inner peripheral surface 13c of the elastic body 13. The protruding length of the upper part of the cylindrical member 21 from the upper end opening of the concave portion is shorter than the depth of the concave portion. In addition, the protruding length is shorter than the axial distance between the portion of the inner peripheral surface 13c of the elastic body 13 that is axially opposite to the upper end opening edge of the cylindrical member 21 and the upper end opening edge of the cylindrical member 21. The upper end opening edge of the cylindrical member 21 is axially opposite to the portion of the inner peripheral surface 13c of the elastic body 13 that extends radially inward from the bottom to the top, and that is offset downward from the central portion in the direction in which the inner peripheral surface 13c extends when viewed in a longitudinal section along the axial direction.

[0048] The radius of the inner circumferential surface of the cylindrical member 21 is larger than the radial interval between the outer circumferential surface of the cylindrical member 21 and the inner circumferential surface of the recessed portion provided on the upper wall surface of the partition member 16. The inner diameter of the cylindrical member 21 is more than half of the maximum inner diameter R of the main liquid chamber 14. In the example shown in the figure, the maximum inner diameter R of the main liquid chamber 14 is the inner diameter of the lower end portion of the inner cylinder portion 11a of the first mounting member 11. The plane area of ​​the portion 16f of the first wall surface 16b located on the inner side of the cylindrical member 21 (hereinafter referred to as the inner side portion) is larger than the plane area of ​​the portion 16g located on the outer side of the cylindrical member 21 (hereinafter referred to as the outer side portion).

[0049] The plurality of first communicating holes 42a are open to both the inner portion 16f and the outer portion 16g of the first wall surface 16b. All of the plurality of first communicating holes 42a are opposite to the upper surface of the movable member 41. The cylindrical member 21 is connected to the portion of the first wall surface 16b between the adjacent first communicating holes 42a, and is arranged in a manner not to overlap with the first communicating holes 42a. The cylindrical member 21 is arranged in a manner that the inner peripheral surface and the outer peripheral surface are in contact with the first communicating holes 42a when viewed from the axial direction.

[0050] Here, the partition member 16 includes a flow state adjustment portion 50. The flow state adjustment portion 50 adjusts the flow of the fluid between the outer peripheral surface 21s of the cylindrical member 21 and the inner peripheral surface 13c of the main liquid chamber 14. Here, the inner peripheral surface 13c of the main liquid chamber 14 is also the inner peripheral surface 13c of the elastic body 13. In addition, the flow state adjustment portion 50 includes a partition member 16 including a plurality of first connecting holes 42a. The flow state adjustment portion 50 may also be a plurality of different forms described below. In addition, the partition member 16 is expressed as including the flow state adjustment portion 50, but the partition member 16 may also be expressed as constituting the flow state adjustment portion 50.

[0051] In the partition member 16 including the flow state adjusting portion 50, the number of the first communicating holes 42a opened in the outer portion 16g is different from the number of the first communicating holes 42a opened in the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50 of the illustrated example, the number of the first communicating holes 42a opened in the outer portion 16g is less than the number of the first communicating holes 42a opened in the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50, the ratio of the opening area of ​​the first communicating holes 42a in the plane area of ​​the outer portion 16g is different from the ratio of the opening area of ​​the first communicating holes 42a in the plane area of ​​the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50 of the illustrated example, the ratio of the opening area of ​​the first communicating holes 42a in the plane area of ​​the outer portion 16g is smaller than the ratio of the opening area of ​​the first communicating holes 42a in the plane area of ​​the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50 , the total opening area of ​​the first communication holes 42 a opened in the inner portion 16 f is larger than the total opening area of ​​the first communication holes 42 a opened in the outer portion 16 g .

[0052] A plurality of first communication holes 42a opened in the outer portion 16g are arranged at equal intervals D in the circumferential direction over the entire circumferential length of the outer portion 16g. A plurality of first communication holes 42a opened in the inner portion 16f are arranged at equal intervals over the entire region of the inner portion 16f. In the inner portion 16f, a plurality of first communication holes 42a are arranged at equal intervals B in the circumferential direction, and a plurality of rows of first communication holes 42a arranged in the circumferential direction are arranged concentrically around the central axis O at equal intervals C in the radial direction.

[0053] In the inner portion 16f of the partition member 16 including the flow state adjusting portion 50, the intervals B and C between the adjacent first communicating holes 42a are smaller than the inner diameter of the first communicating holes 42a. In the outer portion 16g of the partition member 16 including the flow state adjusting portion 50, the interval D between the adjacent first communicating holes 42a is larger than the inner diameter of the first communicating holes 42a. The intervals B and C between the adjacent first communicating holes 42a in the inner portion 16f of the partition member 16 including the flow state adjusting portion 50 are different from the interval D between the adjacent first communicating holes 42a in the outer portion 16g. In the partition member 16 including the flow state adjusting portion 50 of the illustrated example, the intervals B and C between the adjacent first communicating holes 42a in the inner portion 16f are narrower than the interval D between the adjacent first communicating holes 42a in the outer portion 16g. The circumferential spacing B and the radial spacing C between the adjacent first communication holes 42a in the inner portion 16f of the partition member 16 including the flow state adjusting portion 50 are narrower than the circumferential spacing D between the adjacent first communication holes 42a in the outer portion 16g. In the inner portion 16f of the partition member 16 including the flow state adjusting portion 50, the circumferential spacing B and the radial spacing C between the adjacent first communication holes 42a are equal to each other.

[0054] In addition, the intervals B and C between adjacent first connecting holes 42a in the inner part 16f of the partition member 16 including the flow state adjustment part 50 can be set to be greater than the interval D between adjacent first connecting holes 42a in the outer part 16g. In addition, the circumferential interval B and radial interval C between adjacent first connecting holes 42a in the inner part 16f can also be different from each other.

[0055] In the partition member 16 including the flow state adjustment portion 50, the flow resistance of the liquid flowing through the first communication hole 42a opened in the outer part 16g is different from the flow resistance of the liquid flowing through the first communication hole 42a opened in the inner part 16f. In the present embodiment, in the partition member 16 including the flow state adjustment portion 50, the flow path cross-sectional area of ​​the first communication hole 42a opened in the outer part 16g is different from the flow path cross-sectional area of ​​the first communication hole 42a opened in the inner part 16f. In the partition member 16 including the flow state adjustment portion 50, the flow path cross-sectional area of ​​each first communication hole 42a is the same over the entire length in the axial direction. In addition, in the partition member 16 including the flow state adjustment portion 50, the flow path cross-sectional area of ​​each first communication hole 42a may also be different depending on the position in the axial direction. In this case, the flow path cross-sectional area of ​​the first communication hole 42a can be represented by the average value of the flow path cross-sectional areas at multiple positions along the axial direction.

[0056] In the present embodiment, in the partition member 16 including the flow state adjusting portion 50, the flow path cross-sectional area of ​​the first communicating hole 42a opened at the outer portion 16g is smaller than the flow path cross-sectional area of ​​the first communicating hole 42a opened at the inner portion 16f. Thus, the flow resistance of the liquid flowing through the first communicating hole 42a opened at the outer portion 16g is higher than the flow resistance of the liquid flowing through the first communicating hole 42a opened at the inner portion 16f. Here, the thickness of each of the upper wall 33 and the lower wall 34 is the same over the entire region, and the flow path length of the first communicating hole 42a opened at the outer portion 16g is the same as the flow path length of the first communicating hole 42a opened at the inner portion 16f.

[0057] In the partition member 16 including the flow state adjusting portion 50 , the flow path length to of the first communication hole 42a opened in the outer portion 16g and the flow path length ti of the first communication hole 42a opened in the inner portion 16f may be different from each other.

[0058] In the vibration isolation device 1 having such a structure, when an idling vibration with a relatively high frequency among low-frequency vibrations is input in the axial direction, the liquid in the liquid chamber 19 flows through the first communicating hole 42a and the second communicating hole 42b while the movable member 41 is deformed or displaced in the storage chamber 42, thereby attenuating and absorbing the vibration. In addition, when a rocking vibration with a relatively low frequency among low-frequency vibrations is input in the axial direction, the liquid in the liquid chamber 19 flows through the throttle passage 24, thereby attenuating and absorbing the vibration.

[0059] As described above, according to the vibration isolation device 1 of the present embodiment, since the cylindrical member 21 protruding toward the elastic body 13 is disposed on the first wall surface 16b of the partition member 16, when the elastic body 13 is deformed in the secondary vibration mode when viewed in a longitudinal section along the axial direction with the input of the intermediate frequency vibration in the axial direction, the node portion that was previously generated in the central portion of the elastic body 13 is offset to the second mounting member 12 side due to, for example, the difficulty of the liquid flowing between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper portion of the cylindrical member 21, and the portion of the elastic body 13 located closer to the first mounting member 11 than the node portion is easier to deform than the portion located closer to the second mounting member 12 than the node portion. Therefore, when the intermediate frequency vibration in the axial direction is input, the portion of the elastic body 13 located closer to the first mounting member 11 than the node portion is actively deformed, and the stiffness of the elastic body 13 can be reduced in appearance, and the vibration can be attenuated and absorbed.

[0060] In addition, since the plurality of first connecting holes 42a open in both the inner portion 16f and the outer portion 16g of the first wall surface 16b, many first connecting holes 42a can be arranged on the first wall surface 16b, for example, idling vibrations with relatively high frequencies among low-frequency vibrations can be reliably attenuated and absorbed.

[0061] In addition, the partition member 16 includes a flow state adjustment portion 50 for adjusting the flow of the fluid between the outer peripheral surface 21s of the cylindrical member 21 and the inner peripheral surface 13c of the main liquid chamber 14. Therefore, the flow state of the liquid between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the cylindrical member 21, such as the flow rate, can be adjusted, and the position of the node portion can be easily adjusted.

[0062] In addition, in the partition member 16 including the flow state adjustment portion 50, the flow resistance of the liquid flowing through the first connecting hole 42a opened in the outer portion 16g is different from the flow resistance of the liquid flowing through the first connecting hole 42a opened in the inner portion 16f. Therefore, the flow state of the liquid between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper part of the cylindrical member 21, such as the flow rate, can be adjusted, and the position of the node portion can be easily adjusted. In addition, by designing the first connecting hole 42a provided on the first wall surface 16b instead of the cylindrical member 21 protruding from the first wall surface 16b, the flow state of the liquid between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper part of the cylindrical member 21 can be adjusted, so that it is not easy to produce design constraints compared with the case where the cylindrical member 21 is designed to adjust the flow state.

[0063] In the partition member 16 including the flow state adjustment portion 50, the flow path cross-sectional area of ​​the first connecting hole 42a opened in the outer portion 16g is different from the flow path cross-sectional area of ​​the first connecting hole 42a opened in the inner portion 16f. Therefore, the flow resistance of the liquid flowing through the former first connecting hole 42a and the flow resistance of the liquid flowing through the latter first connecting hole 42a can be reliably made different from each other. In the partition member 16 including the flow state adjustment portion 50, the number of the first connecting holes 42a opened in the outer portion 16g and the number of the first connecting holes 42a opened in the inner portion 16f are different from each other, so it is easy to adjust the flow state of the liquid such as the flow velocity between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper part of the cylindrical member 21, and the position of the node portion can be easily adjusted.

[0064] In the partition member 16 including the flow state adjusting portion 50, the flow resistance of the liquid flowing through the first communicating hole 42a opened at the outer portion 16g is higher than the flow resistance of the liquid flowing through the first communicating hole 42a opened at the inner portion 16f. Therefore, it is more difficult for the liquid to flow between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper portion of the cylindrical member 21, and when the intermediate frequency vibration in the axial direction is input, the node portion can be reliably shifted to the second mounting member 12 side, and the intermediate frequency vibration can be reliably attenuated and absorbed.

[0065] In addition, since the axial length of the cylindrical member 21 is more than 20% of the maximum axial height T of the main liquid chamber 14, it is possible to reliably attenuate and absorb axial intermediate frequency vibrations. In addition, since the inner diameter of the cylindrical member 21 is more than half of the maximum inner diameter R of the main liquid chamber 14, it is possible to reliably attenuate and absorb axial intermediate frequency vibrations.

[0066] Furthermore, in the partition member 16 including the flow state adjusting portion 50, the ratio of the opening area of ​​the first communicating hole 42a to the plane area of ​​the outer portion 16g is different from the ratio of the opening area of ​​the first communicating hole 42a to the plane area of ​​the inner portion 16f. Therefore, the flow state such as the flow velocity of the liquid between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper portion of the cylindrical member 21 can be adjusted, and the position of the node portion can be easily adjusted.

[0067] In addition, by designing the first connecting hole 42a to be provided on the first wall surface 16b instead of the cylindrical member 21 protruding from the first wall surface 16b, the flow state of the liquid between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper part of the cylindrical member 21 can be adjusted, so it is less likely to produce design constraints compared to the case where the flow state is adjusted by designing the cylindrical member 21.

[0068] Furthermore, in the partition member 16 including the flow state adjusting portion 50, the flow path cross-sectional area of ​​the first communicating hole 42a opened in the outer portion 16g is different from the flow path cross-sectional area of ​​the first communicating hole 42a opened in the inner portion 16f. Therefore, it is possible to reliably make the ratio of the opening area of ​​the first communicating hole 42a in the plane area of ​​the outer portion 16g and the ratio of the opening area of ​​the first communicating hole 42a in the plane area of ​​the inner portion 16f different from each other.

[0069] Furthermore, in the partition member 16 including the flow state adjusting portion 50, the intervals B and C between the adjacent first communication holes 42a in the inner portion 16f are different from the interval D between the adjacent first communication holes 42a in the outer portion 16g. Therefore, it is possible to reliably make the ratio of the opening area of ​​the first communication holes 42a in the plane area of ​​the outer portion 16g different from the ratio of the opening area of ​​the first communication holes 42a in the plane area of ​​the inner portion 16f.

[0070] Furthermore, in the partition member 16 including the flow state adjustment portion 50, the ratio of the opening area of ​​the first communicating hole 42a to the plane area of ​​the outer portion 16g is smaller than the ratio of the opening area of ​​the first communicating hole 42a to the plane area of ​​the inner portion 16f. Therefore, it is more difficult for the liquid to flow between the inner peripheral surface 13c of the main liquid chamber 14 and the outer peripheral surface 21s of the upper portion of the cylindrical member 21, and when the intermediate frequency vibration in the axial direction is input, the node portion can be reliably shifted to the second mounting member 12 side, and the intermediate frequency vibration can be reliably attenuated and absorbed.

[0071] Next, a second embodiment of the present invention will be described. The basic structure is the same as that of the first embodiment. Therefore, the same reference numerals are given to the same structures, and the description thereof is omitted, and only the different points are described.

[0072] In the vibration isolation device 2 of this embodiment, as Figure 3 As shown in FIG. 1 , in the partition member 16A including the flow state adjusting portion 50A, the flow path length to of the first communication hole 42a opened at the outer portion 16g is different from the flow path length ti of the first communication hole 42a opened at the inner portion 16f. As a result, the flow resistance of the liquid flowing through the first communication hole 42a opened at the outer portion 16g is different from the flow resistance of the liquid flowing through the first communication hole 42a opened at the inner portion 16f.

[0073] In the present embodiment, in the partition member 16A including the flow state adjusting portion 50A, the flow path length to of the first communicating hole 42a opened at the outer portion 16g is longer than the flow path length ti of the first communicating hole 42a opened at the inner portion 16f. Thus, the flow resistance of the liquid flowing through the first communicating hole 42a opened at the outer portion 16g is higher than the flow resistance of the liquid flowing through the first communicating hole 42a opened at the inner portion 16f.

[0074] In the example shown in the figure, the thickness of the outer peripheral portion of each of the upper wall 33A and the lower wall 34A is thicker than the thickness of the portion located at a position radially inward of the outer peripheral portion. The lower surface of the upper wall 33A and the upper surface of the lower wall 34A are respectively flat within the range of the entire region. The thickness of the outer peripheral portion of each of the upper wall 33A and the lower wall 34A is the same as each other. A cylindrical member 21 is provided on the upper surface of the inner peripheral edge portion of the outer peripheral portion of the upper wall 33A. The upper surface of the outer peripheral portion of the upper wall 33A is the outer portion 16g. According to the above, in the partition member 16A including the flow state adjustment portion 50A, the flow path length to of the first connecting hole 42a opened in the outer portion 16g is longer than the flow path length ti of the first connecting hole 42a opened in the inner portion 16f.

[0075] like Figure 4 As shown, in the partition member 16A including the flow state adjusting portion 50A, the flow path cross-sectional area of ​​the first communication hole 42a opened at the outer portion 16g is equal to the flow path cross-sectional area of ​​the first communication hole 42a opened at the inner portion 16f. In the partition member 16A including the flow state adjusting portion 50A, the plurality of first communication holes 42a opened at the first wall surface 16b are all adjacent to each other, and the intervals between the first communication holes 42a are equal to each other and are smaller than the inner diameter of the first communication hole 42a.

[0076] According to the vibration isolation device 2 of the present embodiment, in the partition member 16A including the flow state adjusting portion 50A, the flow path length to of the first communicating hole 42a opened at the outer portion 16g and the flow path length ti of the first communicating hole 42a opened at the inner portion 16f are different from each other. Therefore, the flow resistance of the liquid flowing through the former first communicating hole 42a and the flow resistance of the liquid flowing through the latter first communicating hole 42a can be reliably made different from each other, and the same effect as that of the vibration isolation device 1 of the first embodiment can be achieved.

[0077] In addition, the protective scope of the present invention is not limited to the above-described embodiment, and various modifications can be added within the scope not departing from the gist of the present invention.

[0078] For example, in the partition member 16 including the flow state adjusting portion 50, the flow resistance of the liquid flowing through the first communication hole 42a opened in the outer portion 16g may be lower than the flow resistance of the liquid flowing through the first communication hole 42a opened in the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50, the flow path cross-sectional area of ​​the first communication hole 42a opened in the outer portion 16g may be larger than the flow path cross-sectional area of ​​the first communication hole 42a opened in the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50, the flow path length of the first communication hole 42a opened in the outer portion 16g may be shorter than the flow path length of the first communication hole 42a opened in the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50, the number of the first communication holes 42a opened in the outer portion 16g may be set to be greater than the number of the first communication holes 42a opened in the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50, the ratio of the opening area of ​​the first communicating hole 42a in the plane area of ​​the outer portion 16g may be set to be greater than the ratio of the opening area of ​​the first communicating hole 42a in the plane area of ​​the inner portion 16f. In the partition member 16 including the flow state adjusting portion 50 of the embodiment, the sum of the opening areas of the first communicating holes 42a opened in the inner portion 16f is made larger than the sum of the opening areas of the first communicating holes 42a opened in the outer portion 16g, but the present invention is not limited thereto. For example, in the partition member 16 including the flow state adjusting portion 50, the sum of the opening areas of the first communicating holes 42a opened in the inner portion 16f may be set to be less than the sum of the opening areas of the first communicating holes 42a opened in the outer portion 16g.

[0079] In addition, the structure in which the cylindrical member 21 is connected to the first wall surface 16b in a manner not overlapping with the first communicating hole 42a is shown, but the cylindrical member 21 and the first communicating hole 42a may also be connected to the first wall surface 16b in an overlapping manner. In addition, as the elastic body 13, a structure formed into a cylindrical shape extending in the axial direction is shown, but a structure formed into a ring-shaped plate-like structure having upper and lower surfaces may also be adopted. In addition, a concave pit portion is formed on the upper wall surface of the partition member 16, but the concave pit portion may not be formed.

[0080] Furthermore, in the above-described embodiment, compression-type vibration isolation devices 1 and 2 are described in which a positive pressure is applied to the main liquid chamber 14 due to an applied supporting load. However, the device can also be applied to a suspension-type vibration isolation device in which the main liquid chamber 14 is installed at a lower side in the vertical direction and the auxiliary liquid chamber 15 is installed at an upper side in the vertical direction, and a negative pressure is applied to the main liquid chamber 14 due to an applied supporting load.

[0081] Furthermore, the vibration isolation devices 1 and 2 of the present invention are not limited to being applied to engine mounts of vehicles, but can also be applied to equipment other than engine mounts, for example, to generator mounts mounted on construction machinery, or to machine mounts installed in factories, etc.

[0082] In the partition member 16 including the flow state adjusting portion 50, the ratio of the opening area of ​​the first communicating hole 42a to the plane area of ​​the outer portion 16g may be larger than the ratio of the opening area of ​​the first communicating hole 42a to the plane area of ​​the inner portion 16f.

[0083] In the partition member 16 including the flow state adjusting portion 50 , the flow path cross-sectional area of ​​the first communication hole 42 a opened in the outer portion 16 g may be set to be larger than the flow path cross-sectional area of ​​the first communication hole 42 a opened in the inner portion 16 f .

[0084] In the partition member 16 including the flow state adjusting portion 50 , the flow resistance of the liquid flowing through the first communication hole 42a opened in the outer portion 16g may be set to be lower than the flow resistance of the liquid flowing through the first communication hole 42a opened in the inner portion 16f .

[0085] Furthermore, the components of the above-described embodiment may be appropriately replaced with well-known components without departing from the gist of the present invention, and the above-described embodiment and modified examples may be appropriately combined.

[0086] According to the present invention, since a cylindrical member protruding toward the elastic body is disposed on the first wall surface of the partition member, when the elastic body is deformed in a secondary vibration mode when viewed in a longitudinal section along the axial direction with the input of axial intermediate frequency vibration, the node portion previously generated in the central portion of the elastic body is offset toward the second mounting member side, for example, because the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the cylindrical member is difficult to flow, and in the elastic body, the portion located closer to the first mounting member side than the node portion is easier to deform than the portion located closer to the second mounting member side than the node portion. As a result, when axial intermediate frequency vibration is input, in the elastic body, the portion located closer to the first mounting member side than the node portion is actively deformed, which can apparently reduce the stiffness of the elastic body and can attenuate and absorb the vibration.

[0087] In addition, since the plurality of first connecting holes are open in both the inner portion of the first wall surface located on the inner side of the cylindrical component and the outer portion located on the outer side of the cylindrical component, many first connecting holes can be arranged on the first wall surface, for example, idling vibrations with relatively high frequencies among low-frequency vibrations can be reliably attenuated and absorbed.

[0088] In addition, the partition member includes a flow state adjustment portion for adjusting the flow of the fluid between the outer peripheral surface of the tubular member and the inner peripheral surface of the main liquid chamber. Therefore, the flow state of the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the tubular member, such as the flow rate, can be adjusted, and the position of the node portion can be easily adjusted.

[0089] In addition, in the partition member including the flow state adjusting portion, the flow resistance of the liquid flowing through the first communication hole opened at the outer portion is different from the flow resistance of the liquid flowing through the first communication hole opened at the inner portion. Therefore, the flow state of the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the tubular member, such as the flow velocity, can be adjusted, and the position of the node portion can be easily adjusted.

[0090] In addition, the flow state of the liquid between the inner circumferential surface of the main liquid chamber and the outer circumferential surface of the cylindrical member can be adjusted by designing the first connecting hole provided on the first wall surface instead of the cylindrical member protruding from the first wall surface. Therefore, it is less likely to produce design constraints compared with the case of adjusting the flow state by designing a cylindrical member.

[0091] In the partition member including the flow state adjusting portion, a flow path cross-sectional area of ​​the first communication hole opened at the outer portion and a flow path cross-sectional area of ​​the first communication hole opened at the inner portion may be different from each other.

[0092] In this case, since the flow cross-sectional area of ​​the first connecting hole opening to the outer portion and the flow cross-sectional area of ​​the first connecting hole opening to the inner portion in the partition member are different from each other, the flow resistance of the liquid flowing through the former first connecting hole and the flow resistance of the liquid flowing through the latter first connecting hole can be reliably made different from each other.

[0093] In the partition member, a flow path length of the first communication hole opened in the outer portion and a flow path length of the first communication hole opened in the inner portion may be different from each other.

[0094] In this case, since the flow path length of the first connecting hole opening to the outer portion and the flow path length of the first connecting hole opening to the inner portion in the partition member are different from each other, the flow resistance of the liquid flowing through the first connecting hole of the former and the flow resistance of the liquid flowing through the first connecting hole of the latter can be reliably made different from each other.

[0095] In the partition member, the number of the first communication holes opened in the outer portion and the number of the first communication holes opened in the inner portion may be different from each other.

[0096] In this case, since the number of the first connecting holes opening to the outer part and the number of the first connecting holes opening to the inner part in the partition member are different from each other, it is easy to adjust the flow state such as the flow rate of the liquid between the inner circumferential surface of the main liquid chamber and the outer circumferential surface of the tubular member, and the position of the node part can be easily adjusted.

[0097] In the partition member, a flow resistance of the liquid flowing through the first communication hole opened at the outer portion may be higher than a flow resistance of the liquid flowing through the first communication hole opened at the inner portion.

[0098] In this case, in the partition member, the flow resistance of the liquid flowing through the first connecting hole opened at the outer portion is higher than the flow resistance of the liquid flowing through the first connecting hole opened at the inner portion. Therefore, it is more difficult for the liquid to flow between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the cylindrical member, and when the axial intermediate frequency vibration is input, the node portion can be reliably shifted to the second mounting member side, and the intermediate frequency vibration can be reliably attenuated and absorbed.

[0099] According to the present invention, in the partition member including the flow state adjusting portion, the ratio of the opening area of ​​the first communicating hole to the plane area of ​​the outer portion is different from the ratio of the opening area of ​​the first communicating hole to the plane area of ​​the inner portion. Therefore, the flow state of the liquid between the inner circumferential surface of the main liquid chamber and the outer circumferential surface of the tubular member, such as the flow velocity, can be adjusted, and the position of the node portion can be easily adjusted.

[0100] In addition, the flow state of the liquid between the inner circumferential surface of the main liquid chamber and the outer circumferential surface of the cylindrical member can be adjusted by designing the first connecting hole provided on the first wall surface instead of the cylindrical member protruding from the first wall surface. Therefore, it is less likely to produce design constraints compared with the case of adjusting the flow state by designing a cylindrical member.

[0101] In the partition member, a flow path cross-sectional area of ​​the first communication hole opened at the outer portion and a flow path cross-sectional area of ​​the first communication hole opened at the inner portion may be different from each other.

[0102] In this case, in the partition member, the flow path cross-sectional area of ​​the first communicating hole opened to the outer portion is different from the flow path cross-sectional area of ​​the first communicating hole opened to the inner portion. Therefore, the ratio of the opening area of ​​the first communicating hole to the plane area of ​​the outer portion can be reliably made different from the ratio of the opening area of ​​the first communicating hole to the plane area of ​​the inner portion.

[0103] In the partition member, an interval between the mutually adjacent first communication holes in the inner portion and an interval between the mutually adjacent first communication holes in the outer portion may be different from each other.

[0104] In this case, since in the partition member, the intervals between adjacent first connecting holes in the inner part and the intervals between adjacent first connecting holes in the outer part are different from each other, it is possible to reliably make the proportion of the opening area of ​​the first connecting hole in the plane area of ​​the outer part different from the proportion of the opening area of ​​the first connecting hole in the plane area of ​​the inner part.

[0105] In the partition member, a ratio of an opening area of ​​the first communicating hole to a plane area of ​​the outer portion may be smaller than a ratio of an opening area of ​​the first communicating hole to a plane area of ​​the inner portion.

[0106] In this case, in the partition member, the ratio of the opening area of ​​the first communicating hole to the plane area of ​​the outer portion is smaller than the ratio of the opening area of ​​the first communicating hole to the plane area of ​​the inner portion. Therefore, it is more difficult for the liquid to flow between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the tubular member, and when the intermediate frequency vibration in the axial direction is input, the node portion can be reliably shifted to the second mounting member side, and the intermediate frequency vibration can be reliably attenuated and absorbed.

[0107] The following is based on Figure 5 and Figure 6 A third embodiment of the vibration isolation device of the present invention will be described.

[0108] like Figure 5 As shown, the vibration isolation device 101 is a liquid-sealed vibration isolation device, which includes: a first mounting member 111 and a second mounting member 112, the first mounting member 111 is cylindrical and connected to any one of the vibration generating part and the vibration receiving part, and the second mounting member 112 is connected to the other of the vibration generating part and the vibration receiving part; an elastomer 113, which elastically connects the first mounting member 111 and the second mounting member 112 to each other; a partition member 116, which divides the liquid chamber 119 in the first mounting member 111 sealed with liquid into an auxiliary liquid chamber 115 and a main liquid chamber 114 having the elastomer 113 in a part of the partition wall; and a movable member 141, which is housed in a housing chamber 142 provided in the partition member 116 in a deformable or displaceable manner.

[0109] Hereinafter, the direction along the central axis O of the first mounting member 111 is referred to as the axial direction. In addition, the side where the second mounting member 112 is located in the axial direction is referred to as the upper side, and the side where the partition member 116 is located is referred to as the lower side. In addition, when the vibration isolation device 101 is viewed from above from the axial direction, the direction intersecting the central axis O is referred to as the radial direction, and the direction surrounding the central axis O is referred to as the circumferential direction.

[0110] In addition, the first mounting member 111 , the second mounting member 112 , and the elastic body 113 each have a circular shape or an annular shape in a plan view, and are arranged coaxially with the central axis O.

[0111] When the vibration isolating device 101 is installed in a car, for example, the second mounting member 112 is connected to the engine or the like as a vibration generating part, and the first mounting member 111 is connected to the vehicle body as a vibration receiving part. Thus, the transmission of the vibration of the engine or the like to the vehicle body is suppressed. Alternatively, the first mounting member 111 may be connected to the vibration generating part, and the second mounting member 112 may be connected to the vibration receiving part.

[0112] The first mounting member 111 includes an inner tube portion 111 a , an outer tube portion 111 b , and a lower support portion 111 c .

[0113] The inner tube portion 111a is fitted into the outer tube portion 111b. The lower support portion 111c is formed in an annular shape. The lower end opening edge of the outer tube portion 111b is placed on the upper surface of the outer peripheral portion of the lower support portion 111c. The first mounting member 111 is formed in a cylindrical shape as a whole. The first mounting member 111 is connected to a vehicle body or the like as a vibration receiving portion by means of a bracket not shown in the figure.

[0114] The second mounting member 112 is located radially inside and above the first mounting member 111. The outer diameter of the second mounting member 112 is smaller than the inner diameter of the first mounting member 111. The second mounting member 112 is fitted inside by a mounting metal fitting (not shown) and is connected to an engine or the like as a vibration generating unit via the mounting metal fitting.

[0115] The relative positions of the first mounting member 111 and the second mounting member 112 are not limited to the illustrated example, and may be appropriately changed. In addition, the outer diameter of the second mounting member 112 may be set to be equal to or larger than the inner diameter of the first mounting member 111 .

[0116] The elastic body 113 is formed in a cylindrical shape extending in the axial direction, and the diameter of the elastic body 113 increases from the upper side to the lower side.

[0117] The first mounting member 111 and the second mounting member 112 are connected to the two axial ends of the elastic body 113, respectively. The second mounting member 112 is connected to the upper end of the elastic body 113, and the first mounting member 111 is connected to the lower end of the elastic body 113. The elastic body 113 closes the upper end opening of the first mounting member 111. The lower end of the elastic body 113 is connected to the inner circumferential surface of the inner tube portion 111a of the first mounting member 111. The upper end of the elastic body 113 is connected to the lower surface of the second mounting member 112. The elastic body 113 is formed of a rubber material or the like, and is vulcanized and bonded to the first mounting member 111 and the second mounting member 112. The thickness of the elastic body 113 becomes thinner from the top to the bottom. In addition, the elastic body 113 can also be formed of a synthetic resin material or the like, for example.

[0118] A stopper rubber 113a covering the outer peripheral surface and the upper surface of the second mounting member 112 is integrally formed at the upper end of the elastic body 113. An outer housing 112a surrounding the second mounting member 112 is embedded in the elastic body 113 and the stopper rubber 113a.

[0119] The diaphragm 120 is formed of an elastic material such as rubber or soft resin and is formed into a bottomed cylindrical shape. The upper end of the diaphragm 120 is clamped by the inner circumference of the lower support portion 111c of the first mounting member 111 and the outer circumference of the partition member 116, thereby ensuring the liquid tightness of the inner side of the diaphragm 120 and closing the lower end opening of the first mounting member 111.

[0120] In the example shown in the figure, the bottom of the diaphragm 120 is deep on the outer peripheral side and shallow in the center. However, as the shape of the diaphragm 120, various shapes known in the art can be adopted besides this shape.

[0121] The lower end opening of the first mounting member 111 is closed by the diaphragm 120, and the upper end opening of the first mounting member 111 is closed by the elastic body 113 as described above, so that the first mounting member 111 forms a liquid chamber 119 which is sealed liquid-tightly. A liquid is sealed (filled) in the liquid chamber 119. Examples of the liquid include ethylene glycol, water, and silicone oil.

[0122] The liquid chamber 119 is divided into a main liquid chamber 114 and a sub-liquid chamber 115 in the axial direction by a partition member 116. The main liquid chamber 114 has an inner peripheral surface 113c of the elastic body 113 in a part of the wall surface, and is a space surrounded by the elastic body 113 and the partition member 116, and the inner volume changes according to the deformation of the elastic body 113. The sub-liquid chamber 115 is a space surrounded by the diaphragm 120 and the partition member 116, and the inner volume changes according to the deformation of the diaphragm 120. The vibration isolation device 101 having such a structure is a compression type device installed and used in a manner that the main liquid chamber 114 is located on the upper side in the vertical direction and the sub-liquid chamber 115 is located on the lower side in the vertical direction.

[0123] The partition member 116 is provided with a plurality of first communicating holes 142a that connect the main liquid chamber 114 and the storage chamber 142, and a second communicating hole 142b that connects the auxiliary liquid chamber 115 and the storage chamber 142. The partition member 116 is provided with a plurality of second communicating holes 142b, and the number of the first communicating holes 142a and the number of the second communicating holes 142b are the same. Each of the first communicating holes 142a and the second communicating holes 142b is opposite to each other in the axial direction. The inner diameters (cross-sectional areas of the flow paths) of the first communicating holes 142a and the second communicating holes 142b that are opposite to each other in the axial direction are the same. The flow path lengths of the first communicating holes 142a and the second communicating holes 142b that are opposite to each other in the axial direction are the same. In addition, one second communicating hole 142b may also be formed in the partition member 116.

[0124] Here, in the partition member 116, the upper wall surface constituting a part of the inner surface of the main liquid chamber 114 and the lower wall surface constituting a part of the inner surface of the auxiliary liquid chamber 115 are respectively in a circular shape arranged coaxially with the central axis O when viewed from the axial direction. The diameters of the upper wall surface and the lower wall surface of the partition member 116 are equal to each other. The upper wall surface of the partition member 116 is opposite to the inner peripheral surface 113c of the elastic body 113 in the axial direction, and the lower wall surface of the partition member 116 is opposite to the inner surface of the diaphragm 120 in the axial direction.

[0125] In the example shown in the figure, a concave portion is provided on the entire area of ​​the upper wall surface of the partition member 116 except the peripheral portion 116a. A plurality of first connecting holes 142a are opened on the entire area of ​​the bottom surface (hereinafter referred to as the first wall surface) 116b of the concave portion. A concave portion is provided on the entire area of ​​the lower wall surface of the partition member 116 except the peripheral portion 116c. A plurality of second connecting holes 142b are opened on the entire area of ​​the bottom surface (hereinafter referred to as the second wall surface) 116d of the concave portion. The concave portions of the upper wall surface and the lower wall surface are each in a circular shape coaxially arranged with the central axis O when viewed from the axial direction, and the inner diameter and depth of each concave portion are equal to each other.

[0126] The storage chamber 142 is provided in a portion of the partition member 116 located between the first wall surface 116b and the second wall surface 116d in the axial direction. The storage chamber 142 has a circular shape coaxially arranged with the central axis O when viewed from the axial direction. The diameter of the storage chamber 142 is larger than the diameter of each of the first wall surface 116b and the second wall surface 116d.

[0127] The movable member 141 is formed in a plate shape with its front and back sides facing the axial direction. The movable member 141 has a circular shape arranged coaxially with the central axis O when viewed from the axial direction.

[0128] The partition member 116 is provided with a throttling passage 124 that connects the main liquid chamber 114 and the auxiliary liquid chamber 115. The throttling passage 124 is provided in the axial portion between the outer peripheral edge portion 116a of the upper wall surface and the outer peripheral edge portion 116c of the lower wall surface in the partition member 116. The upper end of the throttling passage 124 is located above the first wall surface 116b, and the lower end of the throttling passage 124 is located below the second wall surface 116d. The flow path cross-sectional shape of the throttling passage 124 is a rectangular shape that is long in the axial direction. The resonance frequency of the throttling passage 124 is lower than the resonance frequency of each of the first connecting hole 142a and the second connecting hole 142b.

[0129] like Figure 6 As shown, the opening 125 of the main liquid chamber 114 side of the throttling passage 124 is provided at the outer peripheral edge 116a of the upper wall surface of the partition member 116. The opening 125 is composed of a plurality of hole rows 125b arranged at intervals in the circumferential direction by the through holes 125a, and arranged in a manner that each position in the radial direction and the circumferential direction is different. The inner diameter of the through hole 125a is smaller than the inner diameter of the first connecting hole 142a. Two hole rows 125b are arranged at the outer peripheral edge 116a of the upper wall surface of the partition member 116. The circumferential offset of each hole row 125b and the radial offset of each hole row 125b are respectively equal to the inner diameter of the through hole 125a.

[0130] The opening of the throttle passage 124 on the auxiliary liquid chamber 115 side is provided at the outer peripheral edge portion 116c of the lower wall surface of the partition member 116, and is an opening having an opening area larger than the opening area of ​​the opening 125 on the main liquid chamber 114 side, that is, the total opening area of ​​the plurality of through holes 125a. The opening 125 on the main liquid chamber 114 side and the opening on the auxiliary liquid chamber 115 side of the throttle passage 124 are located radially outward of the first communicating hole 142a and the second communicating hole 142b.

[0131] A flange portion 116e is provided at the upper end of the partition member 116. The flange portion 116e protrudes outward in the radial direction and extends continuously over the entire circumference. The upper surface of the flange portion 116e abuts against the lower end opening edges of the inner tube portion 111a and the outer tube portion 111b of the first mounting member 111 via an annular upper side sealing material 127. The lower surface of the flange portion 116e abuts against the upper surface of the inner circumference of the lower support portion 111c of the first mounting member 111 via the upper end opening edge of the diaphragm 120 and an annular lower side sealing material 128 surrounding the upper end opening edge of the diaphragm 120 from the radial outer side.

[0132] The partition member 116 includes an upper cylinder 131 and a lower cylinder 132 disposed in abutment with each other in the axial direction, an upper wall 133 closing the lower end opening of the upper cylinder 131, and a lower wall 134 closing the upper end opening of the lower cylinder 132. Alternatively, the partition member 116 may be formed integrally.

[0133] The upper end opening edge of the upper cylinder 131 is the outer peripheral edge portion 116a of the upper wall surface of the aforementioned partition member 116. A flange portion 116e is provided at the upper end portion of the upper cylinder 131. A circumferential groove is provided at a portion of the lower end opening edge of the upper cylinder 131 that is located radially outward relative to the inner circumference, and the circumferential groove is recessed upward and opens radially outward.

[0134] The upper wall 133 is fixed to the inner peripheral portion of the lower end opening edge of the upper cylinder 131. The upper wall 133 is provided with a first communication hole 142a.

[0135] A circumferential groove recessed downward is provided in the radial middle portion of the upper end opening edge of the lower cylinder 132, which is axially opposite to the circumferential groove of the upper cylinder 131. The throttling passage 124 is formed by dividing the circumferential groove and the circumferential groove of the upper cylinder 131. The outer peripheral edge portion of the upper end opening edge of the lower cylinder 132, which is located radially outward of the circumferential groove, abuts against the lower surface of the flange portion 116e of the upper cylinder 131. The lower cylinder 132 is embedded in the upper end portion of the diaphragm 120, and the upper end portion of the diaphragm 120 is embedded in the lower support portion 111c of the first mounting member 111. As a result, the upper end portion of the diaphragm 120 is clamped in the radial direction by the outer peripheral surface of the lower cylinder 132 and the inner peripheral surface of the lower support portion 111c.

[0136] The lower wall 134 is fixed to the inner peripheral portion of the upper end opening edge of the lower cylinder 132. The lower wall 134 is provided with a second communication hole 142b.

[0137] At least one of the inner circumference of the lower end opening edge of the upper cylinder 131 and the inner circumference of the upper end opening edge of the lower cylinder 132 is provided with abutment protrusions 134a, 134b that protrude toward the other and abut against the other. In the illustrated example, both the inner circumference of the lower end opening edge of the upper cylinder 131 and the inner circumference of the upper end opening edge of the lower cylinder 132 are provided with abutment protrusions 134a, 134b. The abutment protrusions 134a, 134b are formed into an annular shape coaxially arranged with the central axis O, and the upper wall 133 and the lower wall 134 are arranged on the radial inner side of the abutment protrusions 134a, 134b in a state of being spaced apart from each other in the axial direction. The storage chamber 142 is divided and formed by the lower surface of the upper wall 133, the upper surface of the lower wall 134, and the inner circumference of the abutment protrusions 134a, 134b.

[0138] Furthermore, in the present embodiment, a cylindrical member 121 is disposed on the first wall surface 116 b of the partition member 116 , which has the first communication hole 142 a and constitutes a portion of the inner surface of the main liquid chamber 114 , and projects axially toward the elastic body 113 .

[0139] The cylindrical member 121 is formed in a cylindrical shape and is arranged coaxially with the central axis O. The cylindrical member 121 extends straight in the axial direction. The axial length of the cylindrical member 121 is more than 20% of the maximum axial height T of the main liquid chamber 114. In the illustrated example, the maximum axial height T of the main liquid chamber 114 is the axial distance between the upper end of the inner circumferential surface 113c of the elastic body 113 and the first wall surface 116b extending radially inward from the bottom to the top. The axial length of the cylindrical member 121 is set so that the upper end of the cylindrical member 121 does not abut against the inner circumferential surface 113c of the elastic body 113 when an axial static load is applied to the vibration isolation device 101 and when an axial vibration is input.

[0140] In addition, as mentioned above, the inner circumferential surface 113c of the elastomer 113 is a portion extending radially inward from the bottom to the top. As in the example shown in the figure, when the upper end portion of the inner surface of the elastomer 113 that divides and forms the main liquid chamber 114 is provided with a recessed pit portion recessed upward, the upper end portion of the inner circumferential surface 113c of the elastomer 113 refers to the opening peripheral edge portion of the recessed pit portion on the inner surface of the elastomer 113.

[0141] The upper portion of the cylindrical member 121 protrudes upward from the upper end opening of the concave portion provided on the upper wall surface of the partition member 116. The outer peripheral surface 121s of the upper portion of the cylindrical member 121 is radially opposite to the lower end of the inner peripheral surface of the inner cylindrical portion 111a of the first mounting member 111 and the lower end of the inner peripheral surface 113c of the elastic body 113. The protruding length of the upper portion of the cylindrical member 121 from the upper end opening of the concave portion is shorter than the depth of the concave portion. In addition, the protruding length is shorter than the axial distance between the portion of the inner peripheral surface 113c of the elastic body 113 that is axially opposite to the upper end opening edge of the cylindrical member 121 and the upper end opening edge of the cylindrical member 121. The upper end opening edge of the cylindrical member 121 is axially opposite to a portion of the inner circumferential surface 113c of the elastic body 113 which extends radially inward from bottom to top and is offset downward from the center portion in the direction in which the inner circumferential surface 113c extends when viewed in a longitudinal section along the axial direction.

[0142] The radius of the inner circumference of the cylindrical member 121 is larger than the radial interval between the outer circumference 121s of the cylindrical member 121 and the inner circumference of the recessed portion provided on the upper wall of the partition member 116. The inner diameter of the cylindrical member 121 is more than half of the maximum inner diameter R of the main liquid chamber 114. In the example shown in the figure, the maximum inner diameter R of the main liquid chamber 114 is the inner diameter of the lower end of the inner cylinder 111a of the first mounting member 111. The plane area of ​​the portion 116f of the first wall surface 116b located on the inner side of the cylindrical member 121 (hereinafter referred to as the inner side portion) is larger than the plane area of ​​the portion 116g located on the outer side of the cylindrical member 121 (hereinafter referred to as the outer side portion).

[0143] The plurality of first communication holes 142 a are open to both the inner portion 116 f and the outer portion 116 g of the first wall surface 116 b . All of the plurality of first communication holes 142 a face the upper surface of the movable member 141 .

[0144] The cylindrical member 121 is connected to a portion of the first wall surface 116b between adjacent first communicating holes 142a and is disposed so as not to overlap with the first communicating holes 142a. The cylindrical member 121 is disposed so that the inner peripheral surface and the outer peripheral surface 121s are in contact with the first communicating holes 142a when viewed from the axial direction.

[0145] Here, the partition member 116 or the movable member 141 includes a flow state adjustment portion 150. The flow state adjustment portion 150 adjusts the flow of the fluid between the outer peripheral surface 121s of the cylindrical member 121 and the inner peripheral surface 113c of the main liquid chamber 114. Here, the inner peripheral surface 113c of the main liquid chamber 114 is also the inner peripheral surface 113c of the elastic body 113. In addition, the flow state adjustment portion 150 includes the movable member 141 or the partition member 116 including a plurality of first connecting holes 142a. The flow state adjustment portion 150 may also be a plurality of different forms described below. In addition, the partition member 116 or the movable member 141 is expressed as including the flow state adjustment portion 150, but the partition member 116 or the movable member 141 may also be expressed as constituting the flow state adjustment portion 150.

[0146] In the partition member 116 including the flow state adjusting portion 150, the number of the first communicating holes 142a opened in the outer portion 116g is different from the number of the first communicating holes 142a opened in the inner portion 116f. In the partition member 116 including the flow state adjusting portion 150 of the illustrated example, the number of the first communicating holes 142a opened in the outer portion 116g is less than the number of the first communicating holes 142a opened in the inner portion 116f.

[0147] In the partition member 116 including the flow state adjusting portion 150, the ratio of the opening area of ​​the first communicating hole 142a to the plane area of ​​the outer portion 116g is different from the ratio of the opening area of ​​the first communicating hole 142a to the plane area of ​​the inner portion 116f. In the partition member 116 including the flow state adjusting portion 150 of the illustrated example, the ratio of the opening area of ​​the first communicating hole 142a to the plane area of ​​the outer portion 116g is smaller than the ratio of the opening area of ​​the first communicating hole 142a to the plane area of ​​the inner portion 116f.

[0148] In the partition member 116 including the flow state adjusting portion 150 , the total opening area of ​​the first communication holes 142 a opened in the inner portion 116 f is larger than the total opening area of ​​the first communication holes 142 a opened in the outer portion 116 g .

[0149] In the partition member 116 including the flow state adjusting portion 150, the flow path cross-sectional area of ​​the first communication hole 142a opened at the outer portion 116g and the flow path cross-sectional area of ​​the first communication hole 142a opened at the inner portion 116f are the same. In addition, in the partition member 116 including the flow state adjusting portion 150, the flow path cross-sectional area of ​​the first communication hole 142a opened at the outer portion 116g and the flow path cross-sectional area of ​​the first communication hole 142a opened at the inner portion 116f may be different from each other.

[0150] In the partition member 116 including the flow state adjusting portion 150, the plurality of first communication holes 142a opened in the first wall surface 116b are all adjacent to each other, and the intervals between the first communication holes 142a are equal to each other and are smaller than the inner diameter of the first communication holes 142a. In addition, the intervals between the adjacent first communication holes 142a in the inner portion 116f of the partition member 116 including the flow state adjusting portion 150 and the intervals between the adjacent first communication holes 142a in the outer portion 116g may be different from each other.

[0151] A plurality of first communication holes 142a opened in the outer portion 116g are arranged at equal intervals in the circumferential direction over the entire circumferential length of the outer portion 116g.

[0152] In the inner portion 116f, a plurality of first communication holes 142a are arranged at equal intervals in the circumferential direction, and a plurality of rows of the first communication holes 142a arranged in the circumferential direction are arranged concentrically around the central axis O at equal intervals in the radial direction.

[0153] Here, in the partition member 116 including the flow state adjusting portion 150, the thickness of each of the upper wall 133 and the lower wall 134 is the same over the entire region, and the flow path length of the first communication hole 142a opened at the outer portion 116g is the same as the flow path length of the first communication hole 142a opened at the inner portion 116f. In addition, in the partition member 116 including the flow state adjusting portion 150, the flow path length of the first communication hole 142a opened at the outer portion 116g and the flow path length of the first communication hole 142a opened at the inner portion 116f may be different from each other.

[0154] In the partition member 116 including the flow state adjusting portion 150, the flow resistance of the liquid flowing through the first communication hole 142a opened at the outer portion 116g and the flow resistance of the liquid flowing through the first communication hole 142a opened at the inner portion 116f are the same. In addition, in the partition member 116 including the flow state adjusting portion 150, the flow resistance of the liquid flowing through the first communication hole 142a opened at the outer portion 116g and the flow resistance of the liquid flowing through the first communication hole 142a opened at the inner portion 116f may be different from each other.

[0155] Furthermore, in the present embodiment, in the movable member 141 including the flow state adjusting portion 150, the rigidity of the outer peripheral portion 141a located radially outward from the cylindrical member 121 is different from the rigidity of the inner portion 141b located radially inward from the cylindrical member 121. In the movable member 141 including the flow state adjusting portion 150, the rigidity of the material forming the outer peripheral portion 141a is different from the rigidity of the material forming the inner portion 141b.

[0156] In the movable member 141 including the flow state adjustment part 150 of the illustrated example, the rigidity of the material forming the outer peripheral part 141a is higher than the rigidity of the material forming the inner part 141b. Thus, in the movable member 141 including the flow state adjustment part 150, the rigidity of the outer peripheral part 141a is higher than the rigidity of the inner part 141b. The materials forming the outer peripheral part 141a and the inner part 141b are elastic materials such as rubber or soft resin. The outer peripheral part 141a and the inner part 141b are bonded or welded to each other. The diameter of the inner part 141b is larger than half the diameter of the movable member 141. The boundary portion of the outer peripheral part 141a and the inner part 141b is located directly below the cylindrical member 121. In addition, the boundary portion can also be located at a position slightly offset radially from the cylindrical member 121.

[0157] In the vibration isolation device 101 having such a structure, when an idling vibration with a relatively high frequency among low-frequency vibrations is input in the axial direction, the liquid in the liquid chamber 119 flows through the first connecting hole 142a and the second connecting hole 142b while the movable member 141 is deformed or displaced in the storage chamber 142, thereby attenuating and absorbing the vibration. In addition, when a rocking vibration with a relatively low frequency among low-frequency vibrations is input in the axial direction, the liquid in the liquid chamber 119 flows through the throttle passage 124, thereby attenuating and absorbing the vibration.

[0158] As described above, according to the vibration isolation device 101 of the present embodiment, since the cylindrical member 121 protruding toward the elastomer 113 is arranged on the first wall surface 116b of the partition member 116, when the elastomer 113 is deformed in the secondary vibration mode when viewed in a longitudinal section along the axial direction with the input of axial medium-frequency vibration, the node portion previously generated in the central portion of the elastomer 113 is offset toward the second mounting member 112 side, for example, due to the difficulty of liquid flowing between the inner peripheral surface 113c of the main liquid chamber 114 and the outer peripheral surface 121s of the upper portion of the cylindrical member 121. In the elastomer 113, the portion located closer to the first mounting member 111 than the node portion is easier to deform than the portion located closer to the second mounting member 112 than the node portion. Therefore, when axial intermediate frequency vibration is input, the portion of the elastic body 113 located closer to the first mounting member 111 than the node portion will actively deform, which can apparently reduce the rigidity of the elastic body 113 and can attenuate and absorb the vibration.

[0159] In addition, since the plurality of first connecting holes 142a open to both the inner portion 116f and the outer portion 116g of the first wall surface 116b, many first connecting holes 142a can be arranged on the first wall surface 116b, for example, idling vibrations with relatively high frequencies among low-frequency vibrations can be reliably attenuated and absorbed.

[0160] In addition, the partition member 116 or the movable member 141 includes a flow state adjustment portion 150 for adjusting the flow of the fluid between the outer peripheral surface 121s of the cylindrical member 121 and the inner peripheral surface 113c of the main liquid chamber 114. Therefore, the flow state of the liquid between the inner peripheral surface 113c of the main liquid chamber 114 and the outer peripheral surface 121s of the cylindrical member 121, such as the flow rate, can be adjusted, and the position of the node portion can be easily adjusted.

[0161] In addition, in the movable member 141 including the flow state adjustment part 150, the rigidity of the outer peripheral part 141a and the rigidity of the inner part 141b are different from each other. Therefore, when vibration is input, the outer peripheral part 141a and the inner part 141b of the movable member 141 are deformed differently, so that the flow state of the liquid between the inner peripheral surface 113c of the main liquid chamber 114 and the outer peripheral surface 121s of the upper part of the cylindrical member 121, such as the flow rate, can be adjusted, and the position of the node part can be easily adjusted.

[0162] In addition, the flow state of the liquid between the inner circumferential surface 113c of the main liquid chamber 114 and the outer circumferential surface 121s of the upper part of the cylindrical member 121 can be adjusted by designing a movable member 141 housed in the storage chamber 142 instead of the cylindrical member 121 protruding from the first wall surface 116b. Therefore, it is less likely to produce design constraints compared with the case of designing the cylindrical member 121 to adjust the flow state.

[0163] In the movable member 141 including the flow state adjusting portion 150, the rigidity of the material forming the outer portion 141a is different from the rigidity of the material forming the inner portion 141b. Therefore, the rigidity of the outer portion 141a and the rigidity of the inner portion 141b can be reliably made different from each other.

[0164] In the movable member 141 including the flow state adjustment part 150, the rigidity of the outer peripheral part 141a is higher than that of the inner part 141b, and when vibration is input, the outer peripheral part 141a is less likely to deform than the inner part 141b. Therefore, the liquid between the inner peripheral surface 113c of the main liquid chamber 114 and the outer peripheral surface 121s of the upper part of the cylindrical member 121 is more difficult to flow, and when the axial intermediate frequency vibration is input, the node part can be reliably offset to the second mounting member 112 side, and the intermediate frequency vibration can be reliably attenuated and absorbed.

[0165] Furthermore, since the axial length of the cylindrical member 121 is equal to or greater than 20% of the maximum axial height T of the main liquid chamber 114 , the intermediate frequency vibration in the axial direction can be reliably attenuated and absorbed.

[0166] Furthermore, since the inner diameter of the cylindrical member 121 is equal to or more than half of the maximum inner diameter R of the main liquid chamber 114 , it is possible to reliably attenuate and absorb the intermediate frequency vibration in the axial direction.

[0167] Next, a fourth embodiment of the present invention will be described, and the basic structure is the same as that of the third embodiment. Therefore, the same reference numerals are given to the same structures, and the description thereof is omitted, and only the different points are described.

[0168] In the vibration isolation device 102 of this embodiment, Figure 7As shown, in the movable member 241 including the flow state adjusting portion 250 , a reinforcing member 141 c is buried in either the outer peripheral portion 241 a or the inner portion 241 b .

[0169] In the example shown in the figure, the entire movable member 241 including the flow state adjustment part 250 is integrally formed of the same material. The reinforcing member 141c is embedded in the outer peripheral portion 241a of the movable member 241. The reinforcing member 141c is formed of a material having a higher rigidity than the material forming the movable member 241. The reinforcing member 141c is formed of, for example, a rubber material, a fiber, a metal material, or a resin material. The reinforcing member 141c is provided within the entire length of the outer peripheral portion 241a in the circumferential direction. The reinforcing member 141c extends continuously within the entire length of the circumferential direction.

[0170] According to the vibration isolation device 102 of the present embodiment, in the movable member 141 including the flow state adjustment section 250, the reinforcing member 141c is embedded in either the outer peripheral portion 241a or the inner portion 241b. Therefore, the rigidity of either one can be increased, and the rigidity of the outer peripheral portion 241a and the rigidity of the inner portion 241b in the movable member 241 can be reliably made different from each other, and the same effects as those of the vibration isolation device 101 of the first embodiment can be achieved.

[0171] Next, a fifth embodiment of the present invention will be described, and the basic structure is the same as that of the third embodiment. Therefore, the same reference numerals are given to the same structures, and the description thereof is omitted, and only the different points are described.

[0172] In the vibration isolation device 103 of this embodiment, Figure 8 As shown, in the movable member 341 including the flow state adjusting portion 350 , the thickness t1o of the outer peripheral portion 341a and the thickness t1i of the inner portion 341b are different from each other.

[0173] In the example shown in the figure, the movable member 341 including the flow state adjusting portion 350 is integrally formed of the same material. In the movable member 341 including the flow state adjusting portion 350, the thickness t1o of the outer peripheral portion 341a is thicker than the thickness t1i of the inner portion 341b. In the movable member 341 including the flow state adjusting portion 350, the thickness t1o of the outer peripheral portion 341a is thicker than the thickness t1i of the inner portion 341b over the entire length in the circumferential direction.

[0174] According to the vibration isolation device 103 of the present embodiment, in the movable member 341 including the flow state adjusting portion 350, the thickness t1o of the outer peripheral portion 341a and the thickness t1i of the inner portion 341b are different from each other. Therefore, the rigidity of the outer peripheral portion 341a and the rigidity of the inner portion 341b can be reliably made different from each other, and the same effect as that of the vibration isolation device 101 of the first embodiment can be achieved.

[0175] In addition, the protective scope of the present invention is not limited to the above-described embodiment, and various modifications can be added within the scope not departing from the gist of the present invention.

[0176] For example, in the movable member 141 including the flow state adjusting portion 150, the rigidity of the material forming the outer portion 141a may be lower than the rigidity of the material forming the inner portion 141b, and the rigidity of the outer portion 141a may be lower than the rigidity of the inner portion 141b.

[0177] In the movable member 141 including the flow state adjusting portion 150 , the reinforcing member 141 c may be buried in the inner portion 141 b of the movable member 141 so that the rigidity of the outer peripheral portion 141 a is lower than that of the inner portion 141 b .

[0178] In the movable member 341 including the flow state adjusting portion 350 , the thickness t1o of the outer portion 341a may be thinner than the thickness t1i of the inner portion 341b , and the rigidity of the outer portion 341a may be lower than that of the inner portion 341b .

[0179] In the movable member 141 including the flow state adjusting portion 150 , the outer peripheral portion 141 a and the inner portion 141 b may be divided and independent of each other.

[0180] In the partition member 116 including the flow state adjusting portion 150 , the number of the first communication holes 142 a opened in the outer portion 116 g may be greater than the number of the first communication holes 142 a opened in the inner portion 116 f .

[0181] In the partition member 116 including the flow state adjusting portion 150, the ratio of the opening area of ​​the first communicating hole 142a to the plane area of ​​the outer portion 116g may be set to be greater than the ratio of the opening area of ​​the first communicating hole 142a to the plane area of ​​the inner portion 116f.

[0182] In the above-described embodiment, in the partition member 116 including the flow state adjusting portion 150, the total opening area of ​​the first communication holes 142a opened to the inner portion 116f is made larger than the total opening area of ​​the first communication holes 142a opened to the outer portion 116g, but the present invention is not limited thereto. For example, the total opening area of ​​the first communication holes 142a opened to the inner portion 116f may be set to be less than the total opening area of ​​the first communication holes 142a opened to the outer portion 116g.

[0183] Furthermore, although the structure in which the cylindrical member 121 is connected to the first wall surface 116b so as not to overlap with the first communicating hole 142a is shown, the cylindrical member 121 may be connected to the first wall surface 116b so as to overlap with the first communicating hole 142a.

[0184] Furthermore, although the elastic body 113 is shown as a structure formed in a cylindrical shape extending in the axial direction, a structure formed in a ring-shaped plate shape having upper and lower surfaces may be adopted.

[0185] Furthermore, although a recessed portion is formed on the upper wall surface of the partition member 116 , the recessed portion may not be formed.

[0186] Furthermore, in the embodiment, compression-type vibration isolation devices 101, 102, 103 are described in which a positive pressure is applied to the main liquid chamber 114 due to the applied supporting load. However, the device can also be applied to a suspension-type vibration isolation device in which the main liquid chamber 114 is installed at the lower side in the vertical direction and the auxiliary liquid chamber 115 is installed at the upper side in the vertical direction, and a negative pressure is applied to the main liquid chamber 114 due to the applied supporting load.

[0187] Furthermore, the vibration isolation devices 101, 102, and 103 of the present invention are not limited to being applied to engine mounts of vehicles, but can also be applied to equipment other than engine mounts, for example, to generator mounts mounted on construction machinery, or to machine mounts installed in factories, etc.

[0188] Furthermore, the components of the above-described embodiment may be appropriately replaced with well-known components without departing from the gist of the present invention, and the above-described embodiment and modified examples may be appropriately combined.

[0189] For example, the partition member may include two situations in which the flow state adjusting portion (a situation in which the flow resistance of the liquid flowing in the first connecting hole opening to the outer part is different from the flow resistance of the liquid flowing in the first connecting hole opening to the inner part and a situation in which the ratio of the opening area of ​​the first connecting hole in the plane area of ​​the outer part is different from the ratio of the opening area of ​​the first connecting hole in the plane area of ​​the inner part) is combined.

[0190] In addition, either or both of the two cases in which the partition member includes a flow state adjusting portion (a case in which the flow resistance of the liquid flowing in the first connecting hole opening to the outer portion is different from the flow resistance of the liquid flowing in the first connecting hole opening to the inner portion and / or a case in which the ratio of the opening area of ​​the first connecting hole in the plane area of ​​the outer portion is different from the ratio of the opening area of ​​the first connecting hole in the plane area of ​​the inner portion) and the case in which the movable member includes a flow state adjusting portion (a case in which the stiffness of the outer peripheral portion located radially outside the tubular member and the stiffness of the inner portion located radially inside the tubular member are different).

[0191] According to the present invention, since a cylindrical member protruding toward the elastic body is disposed on the first wall surface of the partition member, when the elastic body is deformed in a secondary vibration mode when viewed in a longitudinal section along the axial direction with the input of axial intermediate frequency vibration, the node portion previously generated in the central portion of the elastic body is offset toward the second mounting member side, for example, because the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the cylindrical member is difficult to flow, and in the elastic body, the portion located closer to the first mounting member side than the node portion is easier to deform than the portion located closer to the second mounting member side than the node portion. As a result, when axial intermediate frequency vibration is input, in the elastic body, the portion located closer to the first mounting member side than the node portion is actively deformed, which can apparently reduce the stiffness of the elastic body and can attenuate and absorb the vibration.

[0192] In addition, since the plurality of first connecting holes are open in both the inner portion of the first wall surface located on the inner side of the cylindrical component and the outer portion located on the outer side of the cylindrical component, many first connecting holes can be arranged on the first wall surface, for example, idling vibrations with relatively high frequencies among low-frequency vibrations can be reliably attenuated and absorbed.

[0193] Furthermore, the partition member or the movable member includes a flow state adjusting portion, so that the flow state of the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the cylindrical member, such as the flow rate, can be adjusted, and the position of the node portion can be easily adjusted.

[0194] In addition, in a movable component including a flow state adjustment portion, since the stiffness of the outer peripheral portion is different from the stiffness of the inner portion, when vibration is input, the outer peripheral portion and the inner portion in the movable component undergo different deformations, thereby being able to adjust the flow state of the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the tubular component, such as the flow rate, and being able to easily adjust the position of the node portion.

[0195] In addition, the flow state of the liquid between the inner circumferential surface of the main liquid chamber and the outer circumferential surface of the cylindrical member can be adjusted by designing a movable member housed in the storage chamber rather than a cylindrical member protruding from the first wall surface. Therefore, it is less likely to produce design constraints compared to the case of designing a cylindrical member to adjust the flow state.

[0196] In the movable member, the rigidity of a material forming the outer peripheral portion and the rigidity of a material forming the inner portion may be different from each other.

[0197] In this case, since the rigidity of the material forming the outer peripheral portion and the rigidity of the material forming the inner portion in the movable member are different from each other, the rigidity of the outer peripheral portion and the rigidity of the inner portion can be reliably made different from each other.

[0198] In the movable member, a reinforcing member may be embedded in any one of the outer peripheral portion and the inner portion.

[0199] In this case, a reinforcing member is embedded in one of the outer peripheral portion and the inner portion of the movable member, so that the rigidity of the one can be increased, and the rigidity of the outer peripheral portion and the rigidity of the inner portion of the movable member can be reliably made different from each other.

[0200] In the movable member, a thickness of the outer peripheral portion and a thickness of the inner portion may be different from each other.

[0201] In this case, since the thickness of the outer peripheral portion and the thickness of the inner portion of the movable member are different from each other, the rigidity of the outer peripheral portion and the rigidity of the inner portion can be reliably made different from each other.

[0202] In the movable member, the outer peripheral portion may have higher rigidity than the inner portion.

[0203] In this case, the rigidity of the outer peripheral portion of the movable member is higher than that of the inner portion, and when vibration is input, the outer peripheral portion is less likely to deform than the inner portion. Therefore, it is more difficult for the liquid between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the cylindrical member to flow, and when axial intermediate frequency vibration is input, the node portion can be reliably offset to the second mounting member side, and the intermediate frequency vibration can be reliably attenuated and absorbed.

[0204] Industrial Applicability

[0205] The vibration isolation device according to the present invention can attenuate and absorb medium-frequency vibrations.

[0206] Description of Reference Numerals

[0207] 1, 2, 101, 102, 103, vibration isolation device; 11, 111, first mounting member; 12, 112, second mounting member; 13, 113, elastic body; 14, 114, main liquid chamber; 15, 115, auxiliary liquid chamber; 16, 16A, 116, 216, 316, partition member; 16b, 116b, first wall surface; 16f, 116f, inner portion; 1 6g, 116g, outer portion; 19, 119, liquid chamber; 21, 121, tubular member; 24, 124, throttling passage; 41, 141, 241, 341, movable member; 42, 142, storage chamber; 42a, 142a, first connecting hole; 42b, 142b, second connecting hole; 50, 50A, 150, 250, 350, flow state adjustment unit.

Claims

1. A vibration isolation device, in, The vibration isolation device comprises: a first mounting member and a second mounting member, the first mounting member being cylindrical and connected to one of the vibration generating portion and the vibration receiving portion, and the second mounting member being connected to the other of the vibration generating portion and the vibration receiving portion; An elastic body elastically connects the two mounting members; a partition member that partitions a liquid chamber in the first mounting member in which a liquid is sealed into an auxiliary liquid chamber and a main liquid chamber having the elastic body in a part of a partition wall in an axial direction along a central axis of the first mounting member; and a movable member which is accommodated in an accommodation chamber provided in the partition member in a deformable or displaceable manner, The partition member is provided with a throttle passage connecting the main liquid chamber and the auxiliary liquid chamber, a plurality of first communication holes connecting the main liquid chamber and the storage chamber, and a second communication hole connecting the auxiliary liquid chamber and the storage chamber. A cylindrical member is disposed on a first wall surface of the partition member, which has the first communication hole and constitutes a part of the inner surface of the main liquid chamber, and projects toward the elastic body in the axial direction. The plurality of first communicating holes are opened in both the inner portion of the first wall surface located inside the cylindrical member and the outer portion located outside the cylindrical member, and the plurality of first communicating holes are opened in the inner portion. The partition member or the movable member includes a flow state adjusting portion that adjusts the flow of the liquid between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the main liquid chamber. In the partition member including the flow state adjusting portion, the flow resistance of the liquid flowing through the first communication hole opened at the outer portion and the flow resistance of the liquid flowing through the first communication hole opened at the inner portion are different from each other. In the partition member, a flow path length of the first communication hole opened at the outer portion and a flow path length of the first communication hole opened at the inner portion are different from each other.

2. The vibration isolation device according to claim 1, in, In the partition member, a flow path cross-sectional area of ​​the first communication hole opened at the outer portion and a flow path cross-sectional area of ​​the first communication hole opened at the inner portion are different from each other.

3. The vibration isolation device according to claim 1 or 2, in, In the partition member, the number of the first communication holes opened in the outer portion and the number of the first communication holes opened in the inner portion are different from each other.

4. The vibration isolation device according to claim 1 or 2, in, In the partition member, the flow resistance of the liquid flowing through the first communication hole opened at the outer portion is higher than the flow resistance of the liquid flowing through the first communication hole opened at the inner portion.

5. A vibration isolation device, in, The vibration isolation device comprises: a first mounting member and a second mounting member, the first mounting member being cylindrical and connected to one of the vibration generating portion and the vibration receiving portion, and the second mounting member being connected to the other of the vibration generating portion and the vibration receiving portion; An elastic body elastically connects the two mounting members; a partition member that partitions a liquid chamber in the first mounting member in which a liquid is sealed into an auxiliary liquid chamber and a main liquid chamber having the elastic body in a part of a partition wall in an axial direction along a central axis of the first mounting member; and a movable member which is accommodated in an accommodation chamber provided in the partition member in a deformable or displaceable manner, The partition member is provided with a throttle passage connecting the main liquid chamber and the auxiliary liquid chamber, a plurality of first communication holes connecting the main liquid chamber and the storage chamber, and a second communication hole connecting the auxiliary liquid chamber and the storage chamber. A cylindrical member is disposed on a first wall surface of the partition member, which has the first communication hole and constitutes a part of the inner surface of the main liquid chamber, and projects toward the elastic body in the axial direction. The plurality of first communicating holes are opened in both the inner portion of the first wall surface located inside the cylindrical member and the outer portion located outside the cylindrical member, and the plurality of first communicating holes are opened in the inner portion. The partition member or the movable member includes a flow state adjusting portion that adjusts the flow of the liquid between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the main liquid chamber. In the partition member including the flow state adjusting portion, a ratio of an opening area of ​​the first communicating hole to a plane area of ​​the outer portion and a ratio of an opening area of ​​the first communicating hole to a plane area of ​​the inner portion are different from each other. In the partition member, intervals between the first communication holes adjacent to each other in the inner portion and intervals between the first communication holes adjacent to each other in the outer portion are different from each other.

6. The vibration isolation device according to claim 5, in, In the partition member, a flow path cross-sectional area of ​​the first communication hole opened at the outer portion and a flow path cross-sectional area of ​​the first communication hole opened at the inner portion are different from each other.

7. The vibration isolation device according to claim 5 or 6, in, In the partition member, a ratio of an opening area of ​​the first communicating hole to a plane area of ​​the outer portion is smaller than a ratio of an opening area of ​​the first communicating hole to a plane area of ​​the inner portion.

8. A vibration isolation device, in, The vibration isolation device comprises: a first mounting member and a second mounting member, the first mounting member being cylindrical and connected to one of the vibration generating portion and the vibration receiving portion, and the second mounting member being connected to the other of the vibration generating portion and the vibration receiving portion; An elastic body elastically connects the two mounting members; a partition member that partitions a liquid chamber in the first mounting member in which a liquid is sealed into an auxiliary liquid chamber and a main liquid chamber having the elastic body in a part of a partition wall in an axial direction along a central axis of the first mounting member; and a movable member which is accommodated in an accommodation chamber provided in the partition member in a deformable or displaceable manner, The partition member is provided with a throttle passage connecting the main liquid chamber and the auxiliary liquid chamber, a plurality of first communication holes connecting the main liquid chamber and the storage chamber, and a second communication hole connecting the auxiliary liquid chamber and the storage chamber. A cylindrical member is disposed on a first wall surface of the partition member, which has the first communication hole and constitutes a part of the inner surface of the main liquid chamber, and projects toward the elastic body in the axial direction. The plurality of first communicating holes are opened in both the inner portion of the first wall surface located inside the cylindrical member and the outer portion located outside the cylindrical member, and the plurality of first communicating holes are opened in the inner portion. The partition member or the movable member includes a flow state adjusting portion that adjusts the flow of the liquid between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the main liquid chamber. In the movable member including the flow state adjusting portion, the rigidity of the outer peripheral portion located radially outward from the cylindrical member and the rigidity of the inner portion located radially inward from the cylindrical member are different from each other.

9. The vibration isolation device according to claim 8, in, In the movable member, the rigidity of a material forming the outer peripheral portion and the rigidity of a material forming the inner portion are different from each other.

10. The vibration isolation device according to claim 8 or 9, in, In the movable member, a reinforcing member is embedded in any one of the outer peripheral portion and the inner portion.

11. The vibration isolation device according to claim 8 or 9, in, In the movable member, a thickness of the outer peripheral portion and a thickness of the inner portion are different from each other.

12. The vibration isolation device according to claim 8 or 9, in, In the movable member, the outer peripheral portion has a higher rigidity than the inner portion.

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