JP2010133453A - Liquid filled vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress gas in a sub fluid chamber from being entrained into liquid jetted from sub fluid chamber side openings of an orifice in a liquid filled vibration damper. <P>SOLUTION: In this liquid filled vibration damper, a gas entrainment suppressing member 10 is disposed in the sub fluid chamber 6. The gas entrainment suppressing member 10 includes receiving faces 11a, 12a opposingly disposed on the upper side of the orifice 7 and the sub fluid chamber side openings 7c, 8c of a peripheral exhaust passage 8b for receiving the liquid L jetted from the sub fluid chamber side openings 7c, 8c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inner cylinder arranged with the cylinder axis facing sideways, an outer cylinder surrounding the circumference of the inner cylinder, and the two intervening between the inner cylinder and the outer cylinder. Formed on the peripheral wall of the rubber elastic body, a main fluid chamber that is partitioned by the rubber elastic body, a sub fluid chamber that is relatively formed on the lower side, and a sub fluid chamber that is formed on the upper side. And an orifice communicating with the main fluid chamber and the sub-fluid chamber, and the sub-fluid chamber relates to a liquid-filled vibration isolator in which gas is sealed.

2. Description of the Related Art Conventionally, an air diaphragm type liquid-filled vibration isolator is known in which air is enclosed with a liquid and the diaphragm is omitted by utilizing the compression and expansion of the air (see Patent Documents 1 and 2). This liquid-filled vibration isolator includes an inner cylinder arranged with the cylinder axis facing sideways, an outer cylinder surrounding the inner cylinder, and the inner cylinder and the outer cylinder. A rubber elastic body that couples the two together, a main fluid chamber that is partitioned by the rubber elastic body, a sub fluid chamber that is relatively formed at the lower side, and a sub fluid chamber that is formed at the relatively upper side, And an orifice formed in the peripheral wall and communicating with the main fluid chamber and the sub-fluid chamber. Each fluid chamber is filled with liquid as an incompressible fluid and air as a compressible gas, but when used, the main fluid chamber is filled with liquid so that proper vibration isolation performance can be achieved. The sub fluid chamber is configured to be filled with liquid and air. The vibration of the vibration source is attenuated by liquid column resonance or the like that occurs when the liquid flows between the fluid chambers via the orifice.
Japanese Patent No. 3902812 Japanese Patent No. 3631348

  However, in the conventional liquid-filled vibration isolator, when the liquid moves between the two fluid chambers via the orifice, the liquid is ejected from the orifice on the side of the auxiliary fluid chamber to the auxiliary fluid chamber. The gas in the chamber was caught in and mixed in the ejected liquid, and as a result, the gas accumulated in the main fluid chamber, and the loss coefficient tan δ decreased or the variation thereof increased.

  The present invention has been made in view of such a point, and the object of the present invention is to provide an inner cylinder arranged with the cylinder axis facing sideways, an outer cylinder surrounding the inner cylinder, and these A rubber elastic body that is interposed between the inner cylinder body and the outer cylinder body and connects the two to each other, a main fluid chamber that is partitioned by the rubber elastic body, and that is relatively formed on the lower side, and a relatively upper side A sub-fluid chamber formed on the peripheral wall of the rubber elastic body, and an orifice communicating with the main fluid chamber and the sub-fluid chamber. In the vibration isolator, the gas in the subfluid chamber is prevented from being caught in the liquid ejected from the subfluid chamber side opening of the orifice.

  The first invention includes an inner cylinder arranged with the cylinder axis facing sideways, an outer cylinder surrounding the inner cylinder, and interposed between the inner cylinder and the outer cylinder. A rubber elastic body connected to each other, a main fluid chamber that is partitioned by the rubber elastic body and formed at a relatively lower side, a sub fluid chamber that is formed at a relatively upper side, and a peripheral wall of the rubber elastic body An orifice that is formed and communicates with the main fluid chamber and the sub-fluid chamber. The sub-fluid chamber is a liquid-filled vibration isolator in which a gas is sealed, and is disposed in the sub-fluid chamber. And a gas entrainment suppression member having a receiving surface for receiving the liquid ejected from the sub-fluid chamber side opening and disposed above the sub-fluid chamber side opening of the orifice. It is.

  As a result, a gas entrainment suppressing member having a receiving surface for receiving the liquid ejected from the sub-fluid chamber side opening is disposed in the sub-fluid chamber so as to face the upper side of the sub-fluid chamber side opening of the orifice. When the liquid is ejected from the opening of the sub-fluid chamber side of the orifice, the ejected liquid hits the receiving surface and is repelled, and the ejected liquid is prevented from going to the gas side of the sub-fluid chamber. For this reason, it can suppress that the gas of a subfluid chamber is caught in the liquid ejected from the subfluid chamber side opening of the orifice.

  In a second aspect based on the first aspect, the receiving surface is inclined downward or along a predetermined direction as it goes inward from the outside in a predetermined direction orthogonal to the cylinder axis direction and the vertical direction. It extends inward in a predetermined direction from the upper side of the sub fluid chamber side opening.

  As a result, the receiving surface of the gas entrainment suppressing member extends inward in the predetermined direction from the upper side of the secondary fluid chamber side opening of the orifice so as to incline downward as it goes from the outer side to the inner side in the predetermined direction, or along the predetermined direction. Since it extends inward in the predetermined direction from the upper side of the sub-fluid chamber side opening of the orifice, the liquid ejected from the sub-fluid chamber side opening of the orifice can be reliably received by the receiving surface. For this reason, it can suppress reliably that the gas of a subfluid chamber is caught in the liquid ejected from the subfluid chamber side opening of the orifice.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the receiving surface is below the liquid level of the liquid sealed in the sub-fluid chamber in a state where the static load of the supported body is supported. It is located in the side.

  Thereby, in the state where the receiving surface of the gas entrainment suppressing member supports the static load of the supported body, the entire surface thereof is positioned below the liquid surface of the liquid sealed in the sub fluid chamber. Compared to the case where at least a part of the receiving surface of the entrainment suppressing member is located above the liquid surface of the liquid sealed in the subfluid chamber, the liquid ejected from the subfluid chamber side opening of the orifice is received by the receiving surface. Can be received reliably. For this reason, it can suppress reliably that the gas of a subfluid chamber is caught in the liquid ejected from the subfluid chamber side opening of the orifice.

  According to a fourth invention, in any one of the first to third inventions, the length of the receiving surface in the cylinder axis direction is the same as or longer than the length of the auxiliary fluid chamber side opening in the cylinder axis direction. It is a feature.

  Thereby, the cylinder axial length of the receiving surface of the gas entrainment suppressing member is the same as or longer than the cylinder axial length of the sub fluid chamber side opening of the orifice. Compared with the case where the axial length is shorter than the length of the orifice in the sub-fluid chamber side opening, the liquid ejected from the orifice in the sub-fluid chamber side can be reliably received by the receiving surface. For this reason, it can suppress reliably that the gas of a subfluid chamber is caught in the liquid ejected from the subfluid chamber side opening of the orifice.

  A fifth invention is characterized in that, in any one of the first to fourth inventions, the gas entrainment suppressing member is made of rubber integrally formed with the rubber elastic body. .

  Thereby, since the gas entrainment suppressing member is made of rubber integrally molded with the rubber elastic body, the number of members can be reduced.

  According to a sixth invention, in any one of the first to fourth inventions, the gas entrainment suppressing member is a separate member attached to the sub-fluid chamber.

  Thereby, since the gas entrainment suppression member is made into the separate thing attached to the subfluid chamber, the material, shape, etc. of a gas entrainment suppression member can be set arbitrarily.

  According to the present invention, the gas entrainment suppressing member is disposed in the sub fluid chamber so as to face the upper side of the orifice on the sub fluid chamber side and has a receiving surface for receiving the liquid ejected from the sub fluid chamber side opening. Therefore, when the liquid is ejected from the orifice on the side of the sub fluid chamber, the ejected liquid hits the receiving surface and repels, preventing the ejected liquid from going to the gas side of the sub fluid chamber. Therefore, it is possible to suppress the gas in the sub fluid chamber from being caught in the liquid ejected from the sub fluid chamber side opening of the orifice.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 4, a liquid-filled vibration isolator (hereinafter referred to as a vibration isolator) according to Embodiment 1 of the present invention includes a metal inner cylinder 1 having a thin cylindrical shape, A cylindrical metal outer cylinder 2 that surrounds the periphery of the cylinder 1, and a substantially cylindrical rubber elastic body 3 that is interposed between the inner cylinder 1 and the outer cylinder 2 and connects the two to each other. The intermediate cylinder 4 integrated inside the rubber elastic body 3, the main fluid chamber 5 and the sub fluid chamber 6 formed in the outer cylinder 2 and filled with the liquid L, the main fluid chamber 5 and the sub fluid chamber 6. An orifice 7 communicating with the fluid chamber 6, an exhaust passage 8, a plastic lid 9, and the like are provided.

  In the vibration isolator, the inner cylinder 1 is attached to the transmission side of the engine and the outer cylinder 2 is attached in a state where the cylinder axis X is oriented horizontally (horizontally) so that the main fluid chamber 5 is positioned on the lower side. Used attached to the car body. In the following, the vertical direction and the like follow the direction in use, for example, the cylinder axis X direction is the front-rear direction, and the direction orthogonal to the front-rear direction and the vertical direction is the left-right direction (predetermined direction).

  As shown in FIG. 1, this vibration isolator is, for example, mainstream in consideration of the amount of air enclosed as a gas A by combining the rubber elastic body 3 and the lid 9 and press-fitting the outer cylinder 2 halfway. It is manufactured by injecting a predetermined amount of liquid L into the body chamber 5 and the sub-fluid chamber 6 and then press-fitting to the end to caulk both ends of the outer cylinder 2 in the cylinder axis direction.

  As shown in FIG. 2, the rubber elastic body 3 has a pair of arc-shaped walls 3c, 3c and an upper wall 3b in the upper part thereof, and is recessed upward in the lower peripheral wall 3d as shown in FIG. A recess 3e is provided.

  Moreover, the rubber elastic body 3 has the inner cylinder body 1 and the intermediate cylinder body 4 integrated by vulcanization molding inside thereof, and as shown in FIG. In addition, the inner cylinder 1 is provided at a portion where the cylinder axis is displaced above the cylinder axis X of the outer cylinder 2 so as to extend in the front-rear direction in parallel with the cylinder axis X. It is provided so as to surround the periphery of the elastic body 3 near the outer periphery. The rubber elastic body 3 is formed with a pair of gaps 3a and 3a extending in the front-rear direction on both the left and right sides of the inner cylinder 1.

  The auxiliary fluid chamber 6 is surrounded by the upper wall 3b and arc-shaped walls 3c, 3c and the inner wall (inner peripheral surface) of the outer cylindrical body 2 by fitting the rubber elastic body 3 into the outer cylindrical body 2. The main fluid chamber 5 is formed by fitting the lid 9 into the lower opening of the recess 3e.

  A stopper 9 a that protrudes upward is provided at a substantially central portion of the upper wall of the lid 9 that becomes the floor surface of the main fluid chamber 5. Even if the rubber elastic body 3 is greatly deformed and collides with the stopper 9a, the inner wall upper portion 30 of the concave portion 3e serving as the ceiling surface of the main fluid chamber 5 is opposed to the stopper 9a so as to reduce the impact. A buffer portion 30a protruding downward is provided.

  The rubber elastic body 3 having such a shape is elastically connected between the inner cylinder body 1 and the outer cylinder body 2 with a spring balance in which the rigidity in the vertical direction is increased and the rigidity is increased in the vertical direction. is doing.

  That is, in the rubber elastic body 3, the main spring portions 3f and 3f that can be elastically deformed from the left and right sides of the inner cylinder 1 extend obliquely downward toward the outer cylinder 2 in a symmetrical manner, and mainly the inner cylinder. 1 is configured to receive a load applied between the outer cylindrical body 2 and the outer cylindrical body 2 to be elastically deformed.

  In the use state in which the static load of the engine, which is a supported body, is supported, as shown in FIG. 3B, the inner cylindrical body 1 and the upper wall 3b are separated so that the rubber elastic body 3 is While deforming, the inner cylinder 1 is displaced downward.

  In particular, in the present embodiment, the main spring portions 3f and 3f are both configured to stand up and down from the left and right, so that even when a downward load is large, the main spring portions 3f and 3f are firmly received. . The shapes of the main spring portions 3f and 3f can be freely designed without worrying about the gas A accumulated in the main fluid chamber 5 because the exhaust passage 8 is provided as will be described later.

  As shown in FIGS. 1 and 3, the orifice 7 includes a belt-like groove portion 7 a formed by cutting out a substantially central portion in the front-rear direction of the peripheral wall 3 d of the rubber elastic body 3. In a state of being fitted into the cylindrical body 2, it is configured as a strip-shaped passage that extends in the circumferential direction from the lower end of the right main spring portion 3 f and communicates with the sub fluid chamber 6. Thus, since the passage length of the orifice 7 is relatively long, an excellent anti-vibration effect is exhibited in a low frequency range.

  On the other hand, an exhaust passage 8 that can automatically guide the gas A in the main fluid chamber 5 to the sub-fluid chamber 6 to be eliminated is formed separately from the orifice 7.

  That is, the exhaust passage 8 is composed of a lateral exhaust passage 8a and a peripheral exhaust passage 8b (orifice in the present invention). The lateral exhaust passage 8a is formed at the upper end of the left main spring portion 3f ( The upper end of the recess 3e constituting the main fluid chamber 5 is open and extends laterally from there toward the outer periphery.

  Then, as shown in FIGS. 1 and 5, the horizontal exhaust passage 8 a of this embodiment is opened downward by dividing the left main spring portion 3 f of the rubber elastic body 3 into two substantially at the center in the front-rear direction. It is formed in a groove shape. The formation of the lateral exhaust passage 8a in the groove shape in this way is advantageous in terms of manufacturing cost and mass productivity because it facilitates die-cutting at the time of molding, and the gas A accumulated in the main fluid chamber 5 is laterally exhausted. It becomes easy to enter, and also functions as an invitation groove for inducing the gas A from the main fluid chamber 5.

  Furthermore, a circumferential groove that is inclined around the buffer portion 30a formed on the inner wall upper portion 30 of the recess 3e, which is the ceiling surface of the main fluid chamber 5, so that the connection portion with the lateral exhaust passage 8a is located highest. 30b is formed over the entire circumference. That is, since the lateral exhaust passage 8a is opened at the highest portion of the circumferential groove 30b, the gas A accumulated in the upper portion of the main fluid chamber 5 is automatically guided to the opening of the lateral exhaust passage 8a through the circumferential groove 30b. Therefore, it is easy to be excluded from the main fluid chamber 5.

  On the other hand, as shown in FIG. 5, the peripheral exhaust passage 8 b has an outer peripheral surface of the peripheral wall 3 d of the rubber elastic body 3 cut out sufficiently smaller than the orifice 7, and the rubber elastic body 3 is fitted into the outer cylinder 2. In this state, the rubber elastic body 3 is connected to the lateral exhaust passage 8a at the outer peripheral portion, and is configured to be a narrow tubular passage extending upward in the circumferential direction and communicating with the auxiliary fluid chamber 6. Thus, since the passage length of the peripheral exhaust passage 8b is relatively short and the passage cross-sectional area is relatively small, the peripheral exhaust passage 8b also functions as an orifice that exhibits an excellent anti-vibration effect in a high frequency range. To do.

  In the present embodiment, as shown in FIG. 3 (b), when a predetermined static load is applied, the main spring portion 3f is deformed and the upper surface of the lateral exhaust passage 8a is inclined, and the peripheral exhaust passage 8b. Therefore, the gas A accumulated in the main fluid chamber 5 is automatically guided to the sub fluid chamber 6 and can be excluded with certainty. If the lateral exhaust passage 8a is also tilted as described above from the unloaded state, that is, from the molding stage, the above-described effects can be obtained reliably without depending on deformation.

  In addition to these, the communication port 7b of the orifice 7 connected to the main fluid chamber 5 provided at the lower end of the right main spring portion 3f allows the liquid L flowing into the main fluid chamber 5 to flow along the inner wall thereof. In addition, it may be provided so as to open substantially upward. Then, when the vibration isolator is used, when the liquid L flows into the main fluid chamber 5 through the orifice 7, the main fluid chamber 5 is laterally moved along the inner wall from the lower end portion where the orifice 7 is provided. Since the flow of the liquid L toward the exhaust passage 8a is formed, it is possible to more reliably prevent the gas A from accumulating in the main fluid chamber 5.

  As shown in FIGS. 2 to 4, the gas A sealed in the upper portion of the sub-fluid chamber 6 enters the sub-fluid chamber 6 from the sub-fluid chamber side openings 7 c and 8 c of the orifice 7 and the peripheral exhaust passage 8 b. A rubber gas entrainment suppressing member 10 for suppressing entrainment in the liquid L ejected to 6 is disposed. The gas entrainment suppressing member 10 is formed integrally with the rubber elastic body 3. The gas entrainment suppressing member 10 includes first and second gas entrainment suppressing units 11 and 12.

  The first gas entrainment suppressing unit 11 is for suppressing the gas A in the subfluid chamber 6 from being entrained in the liquid L ejected from the subfluid chamber side opening 7 c of the orifice 7. The first gas entrainment suppressing unit 11 is disposed on the right side of the sub fluid chamber 6 so as to be opposed to the upper left side of the sub fluid chamber side opening 7 c of the orifice 7. That is, the first gas entrainment suppressing portion 11 is disposed at substantially the same position as the sub fluid chamber side opening 7c of the orifice 7 in the front-rear direction. The front-rear direction length of the first gas entrainment suppressing portion 11 is longer than the front-rear direction length of the sub-fluid chamber side opening 7 c of the orifice 7 and shorter than the front-rear direction length of the sub-fluid chamber 6.

  The lower surface of the first gas entrainment suppressing portion 11 constitutes a receiving surface 11 a for preventing the liquid L ejected from the sub fluid chamber side opening 7 c of the orifice 7 from going to the gas A side of the sub fluid chamber 6. . The receiving surface 11a is opposed to the upper left side of the sub-fluid chamber side opening 7c of the orifice 7 by the first gas entrainment suppressing portion 11 being arranged opposite the upper left side of the sub fluid chamber side opening 7c of the orifice 7. The liquid L ejected from the secondary fluid chamber side opening 7c of the orifice 7 is received. The receiving surface 11a is inclined from the upper left side of the sub-fluid chamber side opening 7c of the orifice 7 to the left side (inward in the left-right direction) so as to incline downward from the right side (outside in the left-right direction) to the left side (inner side in the left-right direction) It extends. The length of the receiving surface 11a in the front-rear direction is such that the length in the front-rear direction of the first gas entrainment suppressing portion 11 is longer than the length in the front-rear direction of the sub-fluid chamber side opening 7c of the orifice 7. It is longer than the length in the front-rear direction of 7c. The receiving surface 11a is located below the liquid level of the liquid L sealed in the sub-fluid chamber 6 in a use state where the static load of the engine is supported.

  The right end surface of the first gas entrainment suppressing portion 11 is formed in a circular arc shape along the inner wall of the outer cylindrical body 2, while the lower end surface is integrated with the right end portion of the upper wall 3 b of the rubber elastic body 3. It is connected to.

  The second gas entrainment suppressing unit 12 is for suppressing the gas A in the subfluid chamber 6 from being entrained in the liquid L ejected from the subfluid chamber side opening 8c of the peripheral exhaust passage 8b. The second gas entrainment suppressing portion 12 is disposed on the left side of the sub fluid chamber 6 so as to be opposed to the right upper side of the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b. That is, the second gas entrainment suppressing portion 12 is disposed at substantially the same position as the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b in the front-rear direction. The front-rear direction length of the second gas entrainment suppressing portion 12 is longer than the front-rear direction length of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b and shorter than the front-rear direction length of the sub-fluid chamber 6.

  The lower surface of the second gas entrainment suppressing portion 12 constitutes a receiving surface 12a for preventing the liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b from going to the gas A side of the auxiliary fluid chamber 6. ing. The receiving surface 12a is arranged so that the second gas entrainment suppressing portion 12 is disposed on the diagonally upper right side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b, so that the right side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b. Oppositely disposed diagonally above, the liquid L ejected from the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b is received. The receiving surface 12a is tilted downward from the right side (outside in the left-right direction) to the left side (inside in the left-right direction) so as to incline downward from the vicinity of the upper right side of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. ). The longitudinal length of the receiving surface 12a is such that the longitudinal length of the second gas entrainment suppressing portion 12 is longer than the longitudinal length of the secondary fluid chamber side opening 8c of the circumferential exhaust passage 8b. It is longer than the length in the front-rear direction of the fluid chamber side opening 8c. The receiving surface 12a is located below the liquid level of the liquid L sealed in the sub fluid chamber 6 in a use state where the static load of the engine is supported.

  The left end surface of the second gas entrainment suppressing portion 12 is formed in a circular arc shape along the inner wall of the outer cylindrical body 2, while the lower end surface is integrated with the left end portion of the upper wall 3 b of the rubber elastic body 3. It is connected to.

-Operation of vibration isolator-
Hereinafter, the operation of the vibration isolator according to the present embodiment will be described.

  When the engine vibration is transmitted to the inner cylinder 1, the inner cylinder 1 is displaced relative to the outer cylinder 2 in the vertical direction, whereby the volumes of the main fluid chamber 5 and the sub-fluid chamber 6 are alternately changed. Zoom in and out. As a result, the liquid L flows through the orifice 7 and the peripheral exhaust passage 8b, and the engine vibration is attenuated by the liquid column resonance generated in the orifice 7 and the peripheral exhaust passage 8b along with this flow. At this time, since the gas A sealed in the sub fluid chamber 6 is compressed and expanded, the volume variation accompanying the movement of the liquid L between the main fluid chamber 5 and the sub fluid chamber 6 is absorbed. In addition, the flow amount of the liquid L through the peripheral exhaust passage 8b is ensured.

  Further, due to the liquid column resonance generated in the orifice 7 and the peripheral exhaust passage 8b, the liquid L flows from the sub-fluid chamber side openings 7c, 8c of the orifice 7 and the peripheral exhaust passage 8b along the inner wall of the outer cylindrical body 2. Is erupted. Thus, when the liquid L is ejected from the orifice 7 and the auxiliary fluid chamber side openings 7c and 8c of the peripheral exhaust passage 8b, the ejected liquid L is entrained in the first and second gas entrainment members 10. It is repelled by hitting the receiving surfaces 11a and 12a of the suppressing portions 11 and 12 (see the arrow in FIG. 3B), and the jetted liquid L is prevented from going to the gas A side of the sub fluid chamber 6. For this reason, the gas A in the auxiliary fluid chamber 6 is suppressed from being entrained in the liquid L ejected from the orifice 7 and the auxiliary fluid chamber side openings 7c and 8c of the peripheral exhaust passage 8b.

  FIG. 6 is a diagram showing the relationship between the frequency f of the vibration input to the vibration isolator and the loss coefficient tan δ. The solid line in the figure indicates the relationship between the frequency f of vibration input to the vibration isolator according to the present embodiment and the loss factor tan δ, and the broken line indicates the conventional vibration isolator, that is, the gas entrainment suppressing member. The relationship between the frequency f of the vibration input to the vibration isolator without 10 and the loss coefficient tan δ is shown. As shown in FIG. 6, the vibration isolator according to the present embodiment has a loss coefficient tanδ that is greater than that of the conventional vibration isolator. Further, the vibration isolator according to the present embodiment has a smaller variation in the loss coefficient tanδ than the conventional vibration isolator.

-Effect-
As described above, according to the present embodiment, the auxiliary fluid chamber 6 is disposed so as to be opposed to the upper side of the orifice 7 and the auxiliary fluid chamber side openings 7c, 8c of the peripheral exhaust passage 8b, and is ejected from the auxiliary fluid chamber side openings 7c, 8c. Since the gas entrainment suppressing member 10 having the receiving surfaces 11a and 12a for receiving the liquid L is disposed, the liquid L is ejected from the sub-fluid chamber side openings 7c and 8c of the orifice 7 and the peripheral exhaust passage 8b. The ejected liquid L hits the receiving surfaces 11a and 12a and is repelled, and the ejected liquid L is prevented from going to the gas A side of the sub-fluid chamber 6. For this reason, it can suppress that the gas A of the subfluid chamber 6 is caught in the liquid L ejected from the orifice 7 and the subfluid chamber side openings 7c, 8c of the peripheral exhaust passage 8b.

  Further, the receiving surfaces 11a and 12a of the gas entrainment suppressing member 10 are inclined from the upper side of the sub-fluid chamber side openings 7c and 8c of the orifice 7 and the peripheral exhaust passage 8b so that the receiving surfaces 11a and 12a are inclined downward from the outer side in the left-right direction to the inner side. Since it extends inward in the left-right direction, the liquid L ejected from the sub-fluid chamber side openings 7c, 8c of the orifice 7 and the peripheral exhaust passage 8b can be reliably received by the receiving surfaces 11a, 12a. For this reason, it can suppress reliably that the gas A of the subfluid chamber 6 is caught in the liquid L ejected from the orifice 7 and the subfluid chamber side opening 7c, 8c of the surrounding exhaust passage 8b.

  Furthermore, the receiving surfaces 11a and 12a of the gas entrainment suppressing member 10 are positioned below the liquid level of the liquid L sealed in the sub fluid chamber 6 in a state where the static load of the engine is supported. Therefore, the orifice 7 and the peripheral exhaust passage 8b are compared with the case where at least a part of the receiving surfaces 11a and 12a of the gas entrainment suppressing member 10 is located above the liquid level of the liquid L sealed in the sub fluid chamber 6. The liquid L ejected from the auxiliary fluid chamber side openings 7c, 8c can be reliably received by the receiving surfaces 11a, 12a. For this reason, it can suppress reliably that the gas A of the subfluid chamber 6 is caught in the liquid L ejected from the orifice 7 and the subfluid chamber side opening 7c, 8c of the surrounding exhaust passage 8b.

  Furthermore, since the longitudinal lengths of the receiving surfaces 11a, 12a of the gas entrainment suppressing member 10 are longer than the longitudinal lengths of the orifice 7 and the auxiliary fluid chamber side openings 7c, 8c of the peripheral exhaust passage 8b, Compared to the case where the longitudinal lengths of the receiving surfaces 11a, 12a of the suppressing member 10 are shorter than the longitudinal lengths of the orifices 7 and the auxiliary fluid chamber side openings 7c, 8c of the peripheral exhaust passage 8b, the orifice 7 and the peripheral exhaust passage The liquid L ejected from the secondary fluid chamber side openings 7c, 8c of 8b can be reliably received by the receiving surfaces 11a, 12a. For this reason, it can suppress reliably that the gas A of the subfluid chamber 6 is caught in the liquid L ejected from the orifice 7 and the subfluid chamber side opening 7c, 8c of the surrounding exhaust passage 8b.

  Moreover, since the gas entrainment suppressing member 10 is made of rubber integrally formed with the rubber elastic body 3, the number of members can be reduced.

(Embodiment 2)
In the present embodiment, the configuration of the gas entrainment suppressing member 10 is different from that of the first embodiment. Hereinafter, the difference will be mainly described. As shown in FIGS. 7 to 9, the gas entrainment suppressing member 10 according to this embodiment is an outer cylinder attached to the auxiliary fluid chamber 6 by being sandwiched between both arc-shaped walls 3 c and 3 c of the rubber elastic body 3. The body 2 and the rubber elastic body 3 are made of a separate resin. The gas entrainment suppressing member 10 includes first and second gas entrainment suppressing portions 13 and 14, a connecting portion 15, and first to third projecting portions 16 to 18.

  The first gas entrainment suppressing portion 13 is disposed on the right side of the sub fluid chamber 6 so as to be opposed to the upper side of the sub fluid chamber side opening 7 c of the orifice 7. That is, the first gas entrainment suppressing portion 13 is disposed at substantially the same position as the sub fluid chamber side opening 7c of the orifice 7 in the front-rear direction. The front-rear direction length of the first gas entrainment suppressing portion 13 is longer than the front-rear direction length of the sub-fluid chamber side opening 7 c of the orifice 7 and shorter than the front-rear direction length of the sub-fluid chamber 6.

  The lower surface of the first gas entrainment suppressing portion 13 constitutes a receiving surface 13 a for preventing the liquid L ejected from the sub fluid chamber side opening 7 c of the orifice 7 from going to the gas A side of the sub fluid chamber 6. . The receiving surface 13 a is disposed so as to face the upper side of the sub-fluid chamber side opening 7 c of the orifice 7 by the first gas entrainment suppressing portion 13 being disposed facing the upper side of the sub-fluid chamber side opening 7 c of the orifice 7. The liquid L ejected from the sub-fluid chamber side opening 7c of the orifice 7 is received. The receiving surface 13a extends to the left from the vicinity of the upper side of the sub fluid chamber side opening 7c of the orifice 7 along the left-right direction. The receiving surface 13a has a length in the front-rear direction of the first gas entrainment suppressing portion 13 that is longer than a length in the front-rear direction of the sub-fluid chamber side opening 7c of the orifice 7. The opening 7c is longer than the length in the front-rear direction. The receiving surface 13a is located below the liquid level of the liquid L sealed in the sub-fluid chamber 6 in a use state where the static load of the engine is supported. A cross section of the right end surface of the first gas entrainment suppressing portion 13 is formed in an arc shape along the inner wall of the outer cylindrical body 2.

  The second gas entrainment suppressing portion 14 is disposed on the left side of the sub fluid chamber 6 so as to be opposed to the upper side of the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b. That is, the second gas entrainment suppressing portion 14 is disposed at substantially the same position as the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b in the front-rear direction. The front-rear direction length of the second gas entrainment suppressing portion 14 is longer than the front-rear direction length of the sub-fluid chamber side opening 8 c of the peripheral exhaust passage 8 b and shorter than the front-rear direction length of the sub-fluid chamber 6.

  The lower surface of the second gas entrainment suppressing portion 14 constitutes a receiving surface 14a for preventing the liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b from going to the gas A side of the auxiliary fluid chamber 6. ing. The receiving surface 14a is opposed to the upper side of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b by the second gas entrainment suppressing portion 14 being disposed opposite the upper side of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. The liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b is received. The receiving surface 14a extends rightward from the vicinity of the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b so as to extend in the left-right direction. The length of the receiving surface 14a in the front-rear direction is such that the length in the front-rear direction of the second gas entrainment suppressing portion 14 is longer than the length in the front-rear direction of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. It is longer than the length in the front-rear direction of the fluid chamber side opening 8c. The receiving surface 14 a is located below the liquid level of the liquid L sealed in the sub fluid chamber 6 in a use state where the static load of the engine is supported. The cross section of the left end surface of the second gas entrainment suppressing portion 14 is formed in an arc shape along the inner wall of the outer cylindrical body 2.

  The connecting portion 15 is disposed at the center portion in the front-rear direction of the sub fluid chamber 6 and is provided so as to extend in the left-right direction between the first and second gas entrainment suppressing portions 13 and 14 so as to connect the two to each other. And is formed in a rectangular plate shape. The first projecting portion 16 extends upward from the central portion of the connecting portion 15 and has a rectangular cross section. The upper end surface of the first protrusion 16 is formed in an arc shape in cross section so as to follow the inner wall of the outer cylindrical body 2. The 2nd protrusion part 17 is extended from the center part of the connection part 15 to the front side, and the cross section is formed in the rectangular shape. The front end surface of the second protrusion 17 is in contact with the arcuate wall 3 c of the rubber elastic body 3. The third projecting portion 18 extends rearward from the central portion of the connecting portion 15 and has a rectangular cross section. The rear end surface of the third protrusion 18 is in contact with the arcuate wall 3 c of the rubber elastic body 3. As described above, the gas entrainment suppressing member 10 is positioned with respect to the auxiliary fluid chamber 6 by arranging the first to third projecting portions 16 to 18. Thus, by positioning the gas entrainment suppressing member 10, the support stability of the gas entrainment suppressing member 10 is improved.

  The operation of the vibration isolator according to the present embodiment and the relationship between the frequency f of the vibration input to the vibration isolator and the loss coefficient tan δ are substantially the same as in the first embodiment.

-Effect-
As described above, according to the present embodiment, the receiving surfaces 13a and 14a of the gas entrainment suppressing member 10 are laterally moved from the upper side of the orifice 7 and the auxiliary fluid chamber side openings 7c and 8c of the peripheral exhaust passage 8b so as to be along the lateral direction. Since it extends to the inside, the liquid L ejected from the sub-fluid chamber side openings 7c, 8c of the orifice 7 and the peripheral exhaust passage 8b can be reliably received by the receiving surfaces 13a, 14a. For this reason, it can suppress reliably that the gas A of the subfluid chamber 6 is caught in the liquid L ejected from the orifice 7 and the subfluid chamber side opening 7c, 8c of the surrounding exhaust passage 8b.

  Moreover, since the gas entrainment suppressing member 10 is a separate member attached to the sub-fluid chamber 6, the material, shape, and the like of the gas entrainment suppressing member 10 can be arbitrarily set.

  About the other point, the effect similar to Embodiment 1 is acquired.

  In this embodiment, the gas entrainment suppressing member 10 is made of resin, but is not limited thereto, and may be made of rubber, for example. However, from the viewpoint of ease of production at the time of manufacture, it is desirable to use a resin.

(Embodiment 3)
In the present embodiment, the configuration of the gas entrainment suppressing member 10 is different from that of the first embodiment. Hereinafter, the difference will be mainly described. As shown in FIGS. 10 to 12, the gas entrainment suppressing member 10 according to the present embodiment is an outer cylinder attached to the auxiliary fluid chamber 6 by being sandwiched between both arc-shaped walls 3 c and 3 c of the rubber elastic body 3. The body 2 and the rubber elastic body 3 are made of a separate resin. The gas entrainment suppressing member 10 includes first and second gas entrainment suppressing portions 19 and 20, a connecting portion 21, and first to third projecting portions 22 to 24.

  The first gas entrainment suppressing portion 19 is disposed on the right side of the sub fluid chamber 6 so as to be opposed to the upper side of the sub fluid chamber side opening 7 c of the orifice 7. That is, the first gas entrainment suppressing portion 19 is disposed at substantially the same position as the sub fluid chamber side opening 7c of the orifice 7 in the front-rear direction. The front-rear direction length of the first gas entrainment suppressing portion 19 is longer than the front-rear direction length of the sub-fluid chamber side opening 7 c of the orifice 7 and shorter than the front-rear direction length of the sub-fluid chamber 6.

  The lower surface of the first gas entrainment suppressing portion 19 constitutes a receiving surface 19 a for preventing the liquid L ejected from the sub fluid chamber side opening 7 c of the orifice 7 from going to the gas A side of the sub fluid chamber 6. . The receiving surface 19 a is disposed so as to face the upper side of the sub fluid chamber side opening 7 c of the orifice 7 by the first gas entrainment suppressing portion 19 being disposed facing the upper side of the sub fluid chamber side opening 7 c of the orifice 7. The liquid L ejected from the sub-fluid chamber side opening 7c of the orifice 7 is received. The receiving surface 19a extends to the left from the vicinity of the upper side of the sub fluid chamber side opening 7c of the orifice 7 along the left-right direction. The receiving surface 19 a has a length in the front-rear direction of the first gas entrainment suppressing portion 19 that is longer than a length in the front-rear direction of the sub-fluid chamber side opening 7 c of the orifice 7. The opening 7c is longer than the length in the front-rear direction. The receiving surface 19 a is located below the liquid level of the liquid L enclosed in the sub fluid chamber 6 in a use state where the static load of the engine is supported. A cross section of the right end surface of the first gas entrainment suppressing portion 19 is formed in an arc shape along the inner wall of the outer cylinder 2.

  The second gas entrainment suppressing unit 20 is disposed on the left side of the sub fluid chamber 6 so as to be opposed to the upper side of the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b. That is, the second gas entrainment suppressing unit 20 is disposed at substantially the same position as the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b in the front-rear direction. The length in the front-rear direction of the second gas entrainment suppressing portion 20 is longer than the length in the front-rear direction of the sub-fluid chamber side opening 8 c of the peripheral exhaust passage 8 b and shorter than the length in the front-rear direction of the sub-fluid chamber 6.

  The lower surface of the second gas entrainment suppressing portion 20 constitutes a receiving surface 20a for preventing the liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b from going to the gas A side of the auxiliary fluid chamber 6. ing. The receiving surface 20a is opposed to the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b by the second gas entrainment suppressing portion 20 being disposed opposite the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b. The liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b is received. The receiving surface 20a extends from the vicinity of the upper side of the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b to the right side along the left-right direction. The longitudinal length of the receiving surface 20a is such that the longitudinal length of the second gas entrainment suppressing portion 20 is longer than the longitudinal length of the secondary fluid chamber side opening 8c of the circumferential exhaust passage 8b. It is longer than the length in the front-rear direction of the fluid chamber side opening 8c. The receiving surface 20 a is located below the liquid level of the liquid L enclosed in the sub fluid chamber 6 in a use state where the static load of the engine is supported. The cross section of the left end surface of the second gas entrainment suppressing unit 20 is formed in an arc shape along the inner wall of the outer cylindrical body 2.

  The connecting portion 21 is disposed in the central portion of the sub fluid chamber 6 in the front-rear direction, and is provided between the first and second gas entrainment suppressing portions 13 and 14 to connect them to each other. A cross section is formed in an arc shape along the inner wall of the cylindrical body 2. The first projecting portion 22 extends downward from the central portion of the connecting portion 21 and has a rectangular cross section. The lower end surface of the first protrusion 22 has an arcuate cross section along the center of the upper wall 3b of the rubber elastic body 3. The 2nd projection part 23 is extended in the front side from the center part of the connection part 21, and the cross section is formed in the rectangular shape. The front end surface of the second protrusion 23 is in contact with the arcuate wall 3 c of the rubber elastic body 3. The third protrusion 24 extends rearward from the central portion of the connecting portion 21 and has a rectangular cross section. The rear end surface of the third protrusion 24 is in contact with the arcuate wall 3 c of the rubber elastic body 3. As described above, the gas entrainment suppressing member 10 is positioned with respect to the auxiliary fluid chamber 6 by arranging the first to third projecting portions 22 to 24. Thus, by positioning the gas entrainment suppressing member 10, the support stability of the gas entrainment suppressing member 10 is improved.

  The operation of the vibration isolator according to the present embodiment and the relationship between the frequency f of the vibration input to the vibration isolator and the loss coefficient tan δ are substantially the same as in the first embodiment.

  As described above, according to the present embodiment, substantially the same effect as that of the second embodiment can be obtained.

  In this embodiment, the gas entrainment suppressing member 10 is made of resin, but is not limited thereto, and may be made of rubber, for example. However, from the viewpoint of ease of production at the time of manufacture, it is desirable to use a resin.

(Embodiment 4)
In the present embodiment, the configuration of the gas entrainment suppressing member 10 is different from that of the first embodiment. Hereinafter, the difference will be mainly described. As shown in FIGS. 13 and 14, the gas entrainment suppressing member 10 according to the present embodiment is an outer cylinder attached to the auxiliary fluid chamber 6 by being sandwiched between both arc-shaped walls 3 c and 3 c of the rubber elastic body 3. The body 2 and the rubber elastic body 3 are made of a separate resin. The gas entrainment suppressing member 10 includes first and second gas entrainment suppressing units 25 and 26.

  The first gas entrainment suppression unit 25 is disposed on the right side of the sub fluid chamber 6 so as to be opposed to the upper side of the sub fluid chamber side opening 7 c of the orifice 7. That is, the first gas entrainment suppressing portion 25 is disposed at substantially the same position as the sub fluid chamber side opening 7c of the orifice 7 in the front-rear direction. The first gas entrainment suppressing portion 25 has a hat-like cross section.

  The upper part of the inner wall of the first gas entrainment suppressing portion 25 constitutes a receiving surface 25a for preventing the liquid L ejected from the sub fluid chamber side opening 7c of the orifice 7 from going to the gas A side of the sub fluid chamber 6. Yes. The receiving surface 25a is arranged to face the upper side of the sub-fluid chamber side opening 7c of the orifice 7 by the first gas entrainment suppressing portion 25 being arranged to face the upper side of the sub-fluid chamber side opening 7c of the orifice 7. The liquid L ejected from the sub-fluid chamber side opening 7c of the orifice 7 is received. The receiving surface 25a extends to the left from the vicinity of the upper side of the sub fluid chamber side opening 7c of the orifice 7 along the left-right direction. The length of the receiving surface 25 a is longer than the length of the sub-fluid chamber side opening 7 c of the orifice 7 in the front-rear direction. The receiving surface 25a is located below the liquid level of the liquid L sealed in the sub fluid chamber 6 in a use state where the static load of the engine is supported.

  The cross section of the right end surface of the first gas entrainment suppressing portion 25 is formed in an arc shape along the inner wall of the outer cylindrical body 2. The lower surface of the first gas entrainment suppressing portion 25 is supported by contact with the right end portion of the upper wall 3 b of the rubber elastic body 3.

  The second gas entrainment suppression unit 26 is separate from the first gas entrainment suppression unit 25. The second gas entrainment suppressing portion 26 is disposed on the left side of the sub fluid chamber 6 so as to be opposed to the upper side of the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b. That is, the second gas entrainment suppressing portion 26 is disposed at substantially the same position as the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b in the front-rear direction. The second gas entrainment suppressing unit 26 has a hat-like cross section.

  The upper part of the inner wall of the second gas entrainment suppressing portion 26 constitutes a receiving surface 26a for preventing the liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b from going to the gas A side of the auxiliary fluid chamber 6. is doing. The receiving surface 26a is opposed to the upper side of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b by the second gas entrainment suppressing portion 26 being disposed opposite to the upper side of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. The liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b is received. The receiving surface 26a extends to the right from the vicinity of the upper side of the sub fluid chamber side opening 7c of the orifice 7 along the left-right direction. The receiving surface 26a has a length in the front-rear direction that is longer than the length in the front-rear direction of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. The receiving surface 26 a is located below the liquid level of the liquid L sealed in the sub-fluid chamber 6 in a use state where the static load of the engine is supported.

  The cross section of the left end surface of the second gas entrainment suppressing portion 26 is formed in an arc shape along the inner wall of the outer cylindrical body 2. The lower surface of the second gas entrainment suppressing portion 26 is supported by contact with the left end portion of the upper wall 3 b of the rubber elastic body 3.

  The operation of the vibration isolator according to the present embodiment and the relationship between the frequency f of the vibration input to the vibration isolator and the loss coefficient tan δ are substantially the same as in the first embodiment.

  As described above, according to the present embodiment, substantially the same effect as that of the second embodiment can be obtained.

  In this embodiment, the gas entrainment suppressing member 10 is made of resin, but is not limited thereto, and may be made of metal, for example.

(Embodiment 5)
In the present embodiment, the configuration of the gas entrainment suppressing member 10 is different from that of the first embodiment. Hereinafter, the difference will be mainly described. As shown in FIGS. 15 and 16, the gas entrainment suppressing member 10 according to the present embodiment is attached to the auxiliary fluid chamber 6 by being inserted between the inner wall of the outer cylindrical body 2 and the peripheral wall 3 d of the rubber elastic body 3. The outer cylindrical body 2 and the rubber elastic body 3 are made of a separate metal. The gas entrainment suppressing member 10 includes first and second gas entrainment suppressing portions 27 and 28.

  The 1st gas entrainment suppression part 27 is provided with the receiving part 27a and the insertion part 27b. The first gas entrainment suppressing portion 27 is disposed on the right side of the sub fluid chamber 6 such that the receiving portion 27 a is disposed to face the upper side of the sub fluid chamber side opening 7 c of the orifice 7. That is, the first gas entrainment suppressing unit 27 is disposed at substantially the same position as the sub fluid chamber side opening 7c of the orifice 7 in the front-rear direction.

  The receiving portion 27a extends from the vicinity of the upper side of the sub fluid chamber side opening 7c of the orifice 7 to the left side along the left-right direction, and is formed in a rectangular plate shape. The longitudinal length of the receiving portion 27a is longer than the longitudinal length of the sub-fluid chamber side opening 7c of the orifice 7. The lower surface of the receiving portion 27 a constitutes a receiving surface 27 c for preventing the liquid L ejected from the sub fluid chamber side opening 7 c of the orifice 7 from going to the gas A side of the sub fluid chamber 6. The receiving surface 27c is arranged to face the upper side of the sub fluid chamber side opening 7c of the orifice 7 by the receiving portion 27a being arranged to face the upper side of the sub fluid chamber side opening 7c of the orifice 7. The liquid L ejected from the sub fluid chamber side opening 7c is received. The receiving surface 27c extends from the vicinity of the upper side of the sub-fluid chamber side opening 7c of the orifice 7 to the left side so that the receiving portion 27a extends along the left-right direction, so that the sub-fluid chamber side opening 7c of the orifice 7 extends along the left-right direction. It extends from the upper vicinity to the left. The length of the receiving surface 27c in the front-rear direction of the receiving portion 27a is longer than the length in the front-rear direction of the sub-fluid chamber side opening 7c of the orifice 7. It is longer than the direction length. The receiving surface 27c is located below the liquid level of the liquid L sealed in the sub-fluid chamber 6 in a use state where the static load of the engine is supported.

  The insertion portion 27 b extends downward from the right end of the receiving portion 27 a, branches in a bifurcated shape, and has a cross section formed in an arc shape along the inner wall of the outer cylinder 2. The insertion part 27 b is fitted into recesses (not shown) formed on both sides in the front-rear direction of the orifice 7 in the circumferential wall 3 d of the rubber elastic body 3, thereby inserting the inner wall of the outer cylindrical body 2 and the peripheral wall 3 d of the rubber elastic body 3. It is inserted between.

  The 2nd gas entrainment suppression part 28 is provided with the receiving part 28a and the insertion part 28b. The second gas entrainment suppressing portion 28 is disposed on the left side of the sub fluid chamber 6 such that the receiving portion 28a is disposed opposite to the upper side of the sub fluid chamber side opening 8c of the peripheral exhaust passage 8b. That is, the second gas entrainment suppressing portion 28 is disposed at substantially the same position as the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b in the front-rear direction.

  The receiving portion 28a extends from the vicinity of the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b to the right side along the left-right direction, and is formed in a rectangular plate shape. The front-rear direction length of the receiving portion 28a is longer than the front-rear direction length of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. The lower surface of the receiving portion 28a constitutes a receiving surface 28c for preventing the liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b from going to the gas A side of the auxiliary fluid chamber 6. The receiving surface 28c is disposed so as to be opposed to the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b by the receiving portion 28a being opposed to the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b. The liquid L ejected from the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b is received. The receiving surface 28c extends from the vicinity of the upper side of the auxiliary fluid chamber side opening 8c of the peripheral exhaust passage 8b to the right side so that the receiving portion 28a extends along the left and right direction, so that the auxiliary fluid chamber of the peripheral exhaust passage 8b extends along the left and right direction. It extends to the right side from the upper side vicinity of the side opening 8c. The receiving surface 28c has a length in the front-rear direction of the receiving portion 28a that is longer than a length in the front-rear direction of the sub-fluid chamber side opening 8c of the peripheral exhaust passage 8b. The opening 8c is longer than the length in the front-rear direction. The receiving surface 28c is located below the liquid level of the liquid L sealed in the sub-fluid chamber 6 in a use state where the static load of the engine is supported.

  The insertion portion 28 b extends downward from the left end of the receiving portion 28 a, branches in a bifurcated shape, and has a cross section formed in an arc shape along the inner wall of the outer cylindrical body 2. The insertion portion 28 b is fitted into recesses (not shown) formed on both sides in the front-rear direction of the peripheral exhaust passage 8 b in the peripheral wall 3 d of the rubber elastic body 3, thereby inserting the insertion portion 28 b into the inner wall of the outer cylindrical body 2 and the rubber elastic body 3. It is inserted between the peripheral wall 3d.

  The operation of the vibration isolator according to the present embodiment and the relationship between the frequency f of the vibration input to the vibration isolator and the loss coefficient tan δ are substantially the same as in the first embodiment.

  As described above, according to the present embodiment, substantially the same effect as that of the second embodiment can be obtained.

(Other embodiments)
The vibration isolator according to the present invention is not limited to the above-described embodiments, and includes various other configurations.

  That is, in each of the above embodiments, the receiving surface is provided so as to correspond to the orifice 7 and the auxiliary fluid chamber side openings 7c, 8c of the peripheral exhaust passage 8b, respectively, but the receiving surface is provided so as to correspond to only one of them. It may be provided. However, from the viewpoint of suppressing the gas A in the auxiliary fluid chamber 6 from being caught in the liquid L, it is desirable to provide a receiving surface so as to correspond to both.

  In each of the above embodiments, the length in the front-rear direction of the receiving surface of the gas entrainment suppressing member 10 is longer than the length in the front-rear direction of the orifice 7 and the auxiliary fluid chamber side openings 7c, 8c of the peripheral exhaust passage 8b. It may be the same. Thereby, the same effect as the above-described embodiments can be obtained.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the liquid-filled vibration isolator according to the present invention can be applied to a use for suppressing the gas in the subfluid chamber from being caught in the liquid ejected from the subfluid chamber-side opening of the orifice.

It is a disassembled perspective view of the liquid enclosure type vibration isolator which concerns on Embodiment 1 of this invention. It is the figure which looked at the rubber elastic body concerning Embodiment 1 from the upper part. It is a side sectional view seen from the cylinder axis direction of the liquid enclosure type vibration isolator which concerns on Embodiment 1, (a) has shown the state of no load, (b) has shown the state to which the load was added. It is the figure which looked at the rubber elastic body which concerns on Embodiment 1 from the right side. It is a perspective view which shows the principal part of the rubber elastic body which concerns on Embodiment 1. FIG. It is a figure which shows the relationship between the frequency f of the vibration input into the liquid filled type vibration isolator which concerns on Embodiment 1, and loss factor tan-delta. FIG. 3 is a view corresponding to FIG. 2 of a rubber elastic body according to a second embodiment. FIG. 3 is a view corresponding to FIG. 3 of a liquid filled type vibration damping device according to a second embodiment. FIG. 5 is a view corresponding to FIG. 4 of the rubber elastic body according to the second embodiment. FIG. 6 is a view corresponding to FIG. 2 of a rubber elastic body according to a third embodiment. FIG. 6 is a view corresponding to FIG. 3 of a liquid filled type vibration damping device according to a third embodiment. FIG. 5 is a view corresponding to FIG. 4 of the rubber elastic body according to the third embodiment. FIG. 6 is a view corresponding to FIG. 3 of a liquid filled type vibration damping device according to a fourth embodiment. FIG. 5 is a view corresponding to FIG. 4 of a rubber elastic body according to a fourth embodiment. FIG. 6 is a view corresponding to FIG. 3 of a liquid-filled vibration isolator according to Embodiment 5. FIG. 6 is a view corresponding to FIG. 4 of a rubber elastic body according to a fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Rubber elastic body 5 Main fluid chamber 6 Sub fluid chamber 7 Orifice 7c Sub fluid chamber side opening 8 Exhaust passage 8b Circumferential exhaust passage (orifice)
8c Sub fluid chamber side opening 10 Gas entrainment suppressing members 11a to 14a, 19a, 20a, 25a, 26a, 27c, 28c Receiving surface A Gas L Liquid

Claims (6)

An inner cylinder disposed with the cylinder axis facing sideways, an outer cylinder surrounding the inner cylinder, and a rubber elastic body that is interposed between the inner cylinder and the outer cylinder and connects the two to each other A main fluid chamber formed on the lower side, a sub fluid chamber formed on the upper side, and a peripheral wall of the rubber elastic body. An orifice communicating with the chamber and the sub-fluid chamber, wherein the sub-fluid chamber is a liquid-filled vibration isolator in which gas is sealed,
A gas entrainment suppressing member disposed in the sub-fluid chamber and having a receiving surface that is disposed on the upper side of the sub-fluid chamber side opening of the orifice and receives liquid ejected from the sub-fluid chamber side opening; A liquid-filled vibration isolator characterized by comprising: The liquid-filled vibration isolator according to claim 1,
The receiving surface is inclined downward from the outside in a predetermined direction orthogonal to the cylinder axis direction and the vertical direction, or from the upper side of the sub-fluid chamber side opening to the inside in the predetermined direction so as to follow the predetermined direction. A liquid-filled vibration isolator that extends. The liquid-filled vibration isolator according to claim 1 or 2,
The liquid-filled vibration isolating device, wherein the receiving surface is located below the liquid surface of the liquid sealed in the sub-fluid chamber in a state where the static load of the supported body is supported. . In the liquid enclosure type vibration isolator as described in any one of Claims 1-3,
A liquid-filled type vibration damping device, wherein the length of the receiving surface in the cylinder axis direction is the same as or longer than the length of the auxiliary fluid chamber side opening in the cylinder axis direction. In the liquid enclosure type vibration isolator as described in any one of Claims 1-4,
The liquid-encapsulated vibration damping device, wherein the gas entrainment suppressing member is made of rubber integrally formed with the rubber elastic body. In the liquid enclosure type vibration isolator as described in any one of Claims 1-4,
The liquid-encapsulated vibration damping device, wherein the gas entrainment suppressing member is a separate member attached to the sub-fluid chamber.

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