JP2013108584A - Liquid encapsulated vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid encapsulated vibration isolating device in which a gas existing in a thinned portion of a lid is excluded in pouring liquid at manufacturing the liquid encapsulated vibration isolating device.SOLUTION: A resin lid 9 for forming a principal fluid chamber 5 includes a peripheral wall 9a formed along an inner peripheral surface of an outer cylindrical body 2 and a stopper 9b which is formed in such a manner as to protrude to an upper side of the peripheral wall 9a and includes an upper surface 9d against which an elastic rubber body 3 abuts when both of cylindrical bodies 1, 2 vertically moves relative to each other, and four lateral sides 9e, 9e, .... Then, communicating holes 9f, 9f, ... for communicating with the principal fluid chamber 5 and an outer peripheral side of the peripheral wall 9a are formed.

Description

  The present invention relates to a liquid-filled vibration isolator for supporting, for example, an automobile engine.

  2. Description of the Related Art Conventionally, a liquid filled type vibration isolator for supporting, for example, an automobile engine is known. This type of liquid-filled vibration isolator is disclosed in, for example, Patent Document 1, and includes an inner cylinder in which a cylinder shaft is disposed sideways, an outer cylinder surrounding the inner cylinder, and the outer cylinder. A rubber elastic body for connecting the body and the inner cylindrical body, a main fluid chamber defined in the rubber elastic body at a lower position of the inner cylindrical body, and a secondary body defined at an upper position of the inner cylindrical body. A fluid chamber, a liquid and a gas sealed in the main fluid chamber and the sub fluid chamber, and an orifice communicating the main fluid chamber and the sub fluid chamber with each other. The main fluid chamber is a bottom surface of the rubber elastic body. And a lid body fitted along the inner peripheral surface of the outer cylindrical body. The lid is formed with a stopper that protrudes toward the main fluid chamber, and the stopper is in contact with the lower part of the rubber elastic body so as to limit the downward displacement of the inner cylinder to a predetermined amount. It has become.

  When manufacturing the liquid-filled vibration isolator, for example, a combination of a rubber elastic body and a lid is press-fitted halfway into the outer cylinder, and the cylinder axis direction coincides with the vertical direction of the press-fitted one By injecting a specified amount of liquid into the main fluid chamber and sub-fluid chamber in consideration of the amount of air enclosed as gas, and then press-fitting to the end and caulking both ends in the cylinder axis direction of the outer cylinder Made.

Japanese Patent No. 3676025

  Incidentally, the lid may be provided with a lightening portion for weight reduction. FIG. 7 is a view showing an example of such a lid, wherein FIG. 7A is a perspective view, and FIG. 7B is a side view seen from the direction of arrow VIIb in FIG. FIG. 7C is a sectional view taken along line VIIc-VIIc in FIG.

  The lid 90 is made of resin and has a peripheral wall 90a formed along the inner peripheral surface of the outer cylinder, and a rectangular parallelepiped stopper formed so as to protrude upward from the peripheral wall 90a. 90b. And this stopper part 90b has the upper surface 90c contact | abutted to the said rubber elastic body, and four side surfaces 90e, 90e, ... provided in the circumference | surroundings. The four hole portions 90f, 90f,... That are the thinned portions are respectively opened in a pair of side surfaces 90e, 90e facing in the cylinder axis direction, and extend to the center portion in the cylinder axis direction of the stopper portion 90b.

  However, when liquid is injected during manufacturing of the liquid-filled vibration isolator including the lid 90, gas is accumulated in the upper portions of the pair of lower holes 90f and 90f. The liquid sealed in the apparatus is less than the prescribed amount by the volume of the gas accumulated in the holes 90f and 90f. Accordingly, there is a problem that the liquid-filled vibration isolator cannot exhibit desired performance.

  This invention is made | formed in view of such a situation, The place made into the objective excludes the gas in the thickness reduction part of a cover body, when inject | pouring a liquid at the time of manufacture of a liquid enclosure type vibration isolator. An object of the present invention is to provide a liquid-filled vibration isolator capable of performing the above-described operation.

  In order to achieve the above object, the present invention is characterized in that a communication hole communicating with the main fluid chamber and the outer peripheral side of the peripheral wall portion is formed in the lid.

  Specifically, the present invention relates to an inner cylindrical body that is disposed with the cylindrical shaft sideways, an outer cylindrical body that surrounds the inner cylindrical body, and an intermediate body between the inner cylindrical body and the outer cylindrical body. The rubber elastic body is connected to each other, and a concave portion that is recessed upward and that opens downward is formed in the lower peripheral wall, and is partitioned by the rubber elastic body, and is formed relatively below. A main fluid chamber and a sub-fluid chamber formed relatively above, an orifice formed in a peripheral wall of the rubber elastic body and communicating with the main fluid chamber and the sub-fluid chamber, and an opening of the recess. The following solution was taken for a liquid-filled vibration isolator including a resin lid that forms the main fluid chamber.

  According to a first aspect of the present invention, the lid body is formed so as to protrude along the inner peripheral surface of the outer cylindrical body, and protrudes upward from the peripheral wall section. A stopper portion having an upper surface and a side surface with which the rubber elastic body abuts at the time of relative movement in the vertical direction, and a communication hole communicating with the main fluid chamber and the outer peripheral side of the peripheral wall portion is formed. It is characterized by that.

  According to this, the lid body is formed so as to protrude along the inner peripheral surface of the outer cylindrical body, and protrudes upward from the peripheral wall section. A stopper portion having an upper surface and a side surface with which the rubber elastic body abuts at the time of relative movement, and a communication hole communicating with the main fluid chamber and the outer peripheral side of the peripheral wall portion is formed. When the liquid is injected during the manufacture of the vibration isolator, the gas in the communication hole is excluded from the opening on the outer peripheral side of the peripheral wall portion of the communication hole, and the gas is difficult to accumulate in the communication hole. Accordingly, it is possible to suppress the performance deterioration of the liquid filled type vibration isolator.

  In a second aspect based on the first aspect, the communication hole penetrates the lid in the vertical direction.

  According to this, since the communication hole penetrates the lid body in the vertical direction, the communication hole can be molded without using a slide mold. Therefore, since the lid can be molded with a simple mold having an upper mold and a lower mold, the manufacturing cost can be suppressed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, four communication holes are formed, and the outer peripheral surface of the peripheral wall portion is 2 in the cylinder axis direction and the cylinder axis orthogonal direction perpendicular to the vertical direction. Each of the four regions is divided into four equal openings.

  According to this, the four communication holes are formed, and open to four regions each formed by dividing the outer peripheral surface of the peripheral wall portion into two equal parts in the cylinder axis direction and the cylinder axis orthogonal direction perpendicular to the vertical direction. Therefore, a cross-shaped rib is formed on the peripheral wall portion, and the rigidity of the stopper portion on the upper side of the peripheral wall portion is ensured. Therefore, the strength of the stopper portion can be maintained.

  According to a fourth invention, in any one of the first to third inventions, the communication hole opens in at least one of the side surface and the inner peripheral surface of the peripheral wall portion.

  According to this, since the communication hole opens on at least one of the side surface and the inner peripheral surface of the peripheral wall portion, even if gas enters the communication hole when the liquid-filled vibration isolator is used, the gas is released from the opening portion. Eliminated. Therefore, even when the liquid-filled vibration isolator is used, it is possible to suppress the performance degradation. In addition, when opening to both the side surface of a stopper part and the internal peripheral surface of a surrounding wall part, since opening area is larger than the case where it opens to this side surface or this internal peripheral surface, gas is easy to be excluded. Accordingly, it is possible to further suppress the performance degradation of the liquid filled type vibration isolator.

  Further, according to this, since the communication hole is not opened on the upper surface of the stopper portion, the surface pressure on the upper surface is ensured. Therefore, even when the rubber elastic body is greatly deformed and collides with the stopper portion when the liquid filled type vibration isolator is used, the impact can be sufficiently attenuated.

  According to a fifth invention, in any one of the first to fourth inventions, the communication hole extends in a cylinder axis direction.

  According to this, the communication hole extends in the cylinder axis direction. Then, when the liquid is injected during the manufacture of the liquid filled type vibration isolator, the direction in which the communication hole extends coincides with the movement direction of the liquid level, so that the gas in the communication hole naturally moves along with the rise in the liquid level. Be excluded outside. Therefore, it is possible to more reliably suppress the accumulation of gas in the communication hole.

  According to the present invention, the lid is formed with a communication hole that communicates with the main fluid chamber and the outer peripheral side of the peripheral wall portion. The gas in the hole is excluded from the opening on the outer peripheral side of the peripheral wall portion of the communication hole, and the gas is difficult to accumulate in the communication hole. Accordingly, it is possible to suppress the performance deterioration of the liquid filled type vibration isolator.

It is a disassembled perspective view of the liquid enclosure type vibration isolator which concerns on embodiment of this invention. It is the figure which looked at the rubber elastic body which concerns on embodiment of this invention from upper direction. It is side sectional drawing seen from the cylinder-axis direction of the liquid filled type vibration isolator which concerns on embodiment in an unloaded state. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is a perspective view which shows the cover body used for the liquid filled type vibration isolator which concerns on embodiment. It is a figure which shows the cover body used for the liquid filled type vibration isolator which concerns on embodiment, Comprising: The figure (a) is a top view, The figure (b) is seen from the arrow VIb direction of the figure (a). The figure (c) is a VIc-VIc line arrow sectional view of the figure (a). It is a figure which shows the conventional cover body used for a liquid enclosure type vibration isolator, Comprising: The figure (a) is a perspective view, The figure (b) is the side seen from the arrow VIIb direction of the figure (a). FIG. 4C is a cross-sectional view taken along line VIIc-VIIc in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

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

  In this vibration isolator, the inner cylinder 1 is attached to the transmission side of the engine and the outer cylinder 2 is attached to the vehicle body side in a state where the cylinder axis X is turned sideways so that the main fluid chamber 5 is positioned on the lower side. Used. In the following description, the vertical direction follows 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 (cylinder axis orthogonal direction).

  As shown in FIG. 1, the vibration isolator is a main fluid chamber in which the rubber elastic body 3 and the lid body 9 are combined and press-fitted into the outer cylinder 2 halfway, and the amount of air as gas A is taken into account. 5 and the sub-fluid chamber 6 are injected by injecting a predetermined amount of liquid L, and then press-fitted to the end to crimp 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.

  Further, the rubber elastic body 3 has an inner cylinder 1 and an intermediate cylinder 4 integrated by vulcanization molding therein, and in an unloaded state, as shown in FIG. The body 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 front and back in parallel with the cylinder axis X. The intermediate cylinder 4 is formed of the rubber elastic body 3. It is provided so as to surround the periphery 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 formed by fitting the rubber elastic body 3 into the outer cylindrical body 2 so as to be surrounded by the upper wall 3b and arc-shaped walls 3c, 3c and the inner wall of 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 portion 9 b 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 portion 9b, the inner wall upper portion 30 of the concave portion 3e serving as the ceiling surface of the main fluid chamber 5 is placed on the stopper portion 9b so as to reduce the impact. A buffer portion 30a that protrudes 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. 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.

  And in the use state which supported the static load of the engine which is a to-be-supported body, between the inner cylinder 1 and the upper wall 3b isolate | separates, the spring elastic body 3 deform | transforms, and the inner cylinder 1 is displaced below. To do.

  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 to 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. It is configured as a belt-like passage that extends in the circumferential direction from one lower end of the main spring portion 3 f and communicates with the auxiliary fluid chamber 6 in a state of being fitted into the cylindrical body 2. 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. The lateral exhaust passage 8a is formed at the upper end (the main fluid chamber 5) of the other main spring portion 3f in which the orifice 7 is formed. At the upper end of the concave portion 3e), and extends laterally from there toward the outer periphery.

  Then, as shown in FIG. 1, the horizontal exhaust passage 8a of the present embodiment is formed in a groove shape that is opened downward by dividing one main spring portion 3f of the rubber elastic body 3 into a substantially central portion in the front-rear direction. Has been. 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, the peripheral exhaust passage 8b is cut out sufficiently smaller than the orifice 7 so that the outer peripheral surface of the peripheral wall portion 3d of the rubber elastic body 3 does not substantially function as an orifice, so that the rubber elastic body 3 is the outer cylinder. In the state of being fitted into the body 2, the rubber elastic body 3 is connected to the lateral exhaust passage 8 a at the outer peripheral portion, and is configured to be a narrow tubular passage that extends upward in the circumferential direction and communicates with the auxiliary fluid chamber 6. Has been.

  In this embodiment, when a predetermined static load is applied, the main spring portion 3f is deformed so that the upper surface of the lateral exhaust passage 8a is inclined, and the connection portion with the peripheral exhaust passage 8b is set to be the highest. 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 which is provided at one lower end of the main spring portion 3f and communicates with the main fluid chamber 5 allows the liquid L flowing into the main fluid chamber 5 to flow along the inner wall thereof. It is preferable to provide a substantially upward opening. 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.

-Lid structure-
Next, the detailed structure of the lid body 9 will be described mainly with reference to FIGS. FIG. 5 is a perspective view showing the lid body 9. 6A and 6B are views showing the lid body 9. FIG. 6A is a plan view, and FIG. 6B is a side view seen from the direction of the arrow VIb in FIG. Fig. (C) is a sectional view taken along line VIc-VIc of Fig. (A). The directions shown in FIGS. 5 and 6 follow the directions when the vibration isolator is used.

  The lid body 9 includes a peripheral wall portion 9a formed along the inner peripheral surface of the outer cylindrical body 2, and the stopper portion 9b formed so as to protrude upward on the upper surface of the peripheral wall portion 9a. ing.

  The peripheral wall portion 9a has a substantially rectangular plate shape curved with the same curvature as the inner peripheral surface of the outer cylindrical body 2, and protrudes outward in the left-right direction at both ends in the front-rear direction at both ends in the left-right direction. Leg portions 9c, 9c,... Curved with the same curvature as the inner peripheral surface 2 are formed. As shown in FIG. 1, these leg portions 9 c, 9 c,... Are fitted into four groove portions provided on the lower peripheral wall of the rubber elastic body 3, so that the lid body 9 is attached to the rubber elastic body 3.

  The stopper portion 9b has a rectangular parallelepiped shape, and an upper surface 9d that comes into contact with the buffer portion 30a of the rubber elastic body 3 when the inner cylinder 1 moves in the vertical direction relative to the outer cylinder 2; There are four side surfaces 9e, 9e,... Provided around the upper surface 9d. In FIG. 5, only two of the four side surfaces 9e, 9e,... Are shown, and the remaining two are hidden.

  As shown in FIGS. 1, 3, and 4, the lid 9 has four communication holes 9f, 9f,... That communicate the main fluid chamber 5 with the outer peripheral side of the peripheral wall 9a. Is provided. In FIG. 5, only two of the four communication holes 9f, 9f,... Are shown, and the remaining two are hidden.

  These communication holes 9f, 9f,... Are provided below the upper surface 9d of the stopper portion 9a, and pass through the center C of the stopper portion 9b when the lid body 9 is viewed from above and below, as shown in FIG. The four center lines X and Y extending in the front-rear direction and the left-right direction are arranged symmetrically with respect to the two center lines X and Y, respectively.

  Since these communication holes 9f, 9f,... Have the same shape, the shape of one communication hole 9f will be described. As shown in FIG. 6A, the communication hole 9f has a rectangular shape extending in the front-rear direction when the lid body 9 is viewed from the up-down direction, and specifically, from the central portion of the stopper portion 9b in the front-rear direction. It extends to the outside of the stopper portion 9b of the peripheral wall portion 9a, and extends from the center portion of the stopper portion 9b in the left-right direction to a slightly inner side from the outer end in the left-right direction. As shown in FIG. 6B, the communication hole 9f has a substantially rectangular shape extending in the vertical direction when the lid body 9 is viewed from the front-rear direction, and is formed between the vertical center position of the stopper portion 9b and the upper surface 9d. It extends downward from the intermediate position and opens on the outer peripheral surface of the peripheral wall portion 9a, and further penetrates the outer portion of the stopper portion 9b of the peripheral wall portion 9a in the vertical direction. The left and right side surfaces 9g, 9g of the communication hole 9f are vertically formed. Further, as shown in FIG. 6 (c), the communication hole 9f opens in the front-rear direction side surface 9e of the stopper portion 9b when the lid body 9 is viewed from the left-right direction, and the opening portion and the stopper portion of the peripheral wall portion 9a. The penetrating part of the outer part of 9b is connected. The ceiling surface 9h of the communication hole 9f is inclined upward as it goes toward the front-rear direction side surface 9e, in other words, as it goes outward in the front-rear direction. Further, the longitudinal surface 9i on the inner side in the front-rear direction of the communication hole 9f is formed vertically.

  Since the communication holes 9f, 9f,... Having such shapes are arranged as described above, two holes extending in the front-rear direction and the left-right direction through the center C are provided below the upper surface 9d in the stopper portion 9b. Ribs 9j, 9j are formed.

  The inventors of the present application performed a simulation to verify the effects of the ribs 9j and 9j. The simulation is different from the lid 9 in that the lid 9 and only one communication hole 9f that passes through the stopper C 9b in the front-rear direction through the center C are formed (hereinafter referred to as comparison). 2 types). That is, the comparative product has an upper surface 9d having the same area as the lid 9, and the ribs 9j and 9j are not formed on the comparative product. In the simulation, the stress applied to the lid surface is calculated by the finite element method under the condition that the outer peripheral surface of the peripheral wall portion 9a is completely constrained and the same load is applied to the upper surface 9d of each stopper portion 9b vertically from above. did. As a result, the maximum stress applied to the lid body 9 was about half that of the comparative product. Therefore, it was confirmed that the cross-shaped ribs 9j and 9j contribute to the improvement of the strength of the stopper portion 9b.

≪Effect≫
According to the present embodiment, the lid 9 is formed with the communication holes 9f, 9f,... Communicating with the main fluid chamber 5 and the outer peripheral side of the peripheral wall portion 9a. When the gas A is injected, the gas A in the communication holes 9f, 9f,... It becomes difficult to accumulate. Therefore, it is possible to suppress the performance deterioration of the vibration isolator.

  Further, according to the present embodiment, the communication holes 9f, 9f,... Penetrate through the lid body 9 in the vertical direction, so that these communication holes 9f, 9f,. Is possible. Therefore, since the lid 9 can be molded with a simple mold having an upper mold and a lower mold, the manufacturing cost can be suppressed.

  Further, according to the present embodiment, four communication holes 9f, 9f,... Are formed, and each of the four regions is formed by dividing the outer peripheral surface of the peripheral wall portion 9a into two equal parts in the front-rear direction and the left-right direction. Since it is open, cross-shaped ribs 9j and 9j passing through the center C are formed on the peripheral wall 9a, and the rigidity of the stopper 9b is ensured. Accordingly, the strength of the stopper portion 9b can be maintained.

  Further, according to the present embodiment, the communication holes 9f, 9f,... Open to the left and right side surfaces 9e, 9e and the inner peripheral surface of the peripheral wall portion 9a, so that these communication holes 9f, 9f,. ... Even if gas A enters, gas A is excluded from this opening. Therefore, even when the vibration isolator is used, it is possible to suppress the performance degradation.

  Further, according to the present embodiment, since the communication holes 9f, 9f,... Are not opened on the upper surface 9d of the stopper portion 9b, the surface pressure on the upper surface 9d is ensured. Accordingly, even when the rubber elastic body 3 is greatly deformed and collides with the stopper portion 9b when the vibration isolator is used, the impact can be sufficiently attenuated.

  Further, according to the present embodiment, the communication holes 9f, 9f,. Then, when injecting the liquid L at the time of manufacturing the vibration isolator, the extending direction of the communication holes 9f, 9f,... Matches the moving direction of the liquid surface, so the gas A in the communication holes 9f, 9f,. Is naturally removed as the liquid level rises. Therefore, it is possible to more reliably suppress the gas A from accumulating in the communication holes 9f, 9f,.

  Further, according to the present embodiment, the communication holes 9f, 9f,... Open to the left and right side surfaces 9e, 9e of the stopper portion 9b, respectively, and the ceiling surfaces 9h, 9h,. Is inclined upward as it goes to the left and right side surfaces 9e, 9e, so that even if the gas A enters the communication holes 9f, 9f,. ... becomes the guide surface and guides the gas A upward. Therefore, the gas A that has entered the communication holes 9f, 9f,... Can be easily removed, and the accumulation of the gas A in the communication holes 9f, 9f,.

(Other embodiments)
In the above embodiment, the communication holes 9f, 9f,... Extend in the front-rear direction, but are not limited to this. For example, you may extend in the left-right direction. However, when the communication holes 9f, 9f,... Extend in the front-rear direction, the direction in which the communication holes 9f, 9f,. Therefore, the gas A in the communication holes 9f, 9f,... Is naturally removed as the liquid level rises, and the accumulation of the gas A can be more reliably suppressed.

  In the above embodiment, the four communication holes 9f, 9f,... Are arranged symmetrically with respect to the two center lines X, Y. However, the present invention is not limited to this. For example, the pair of communication holes 9f, 9f arranged in the front-rear direction may be communicated with each other to form a pair of communication holes symmetrical with respect to the center line X. In this case, when the liquid L is injected at the time of manufacturing the vibration isolator, the gas A in the communication hole rises and is not obstructed by the rib. However, from the viewpoint of the strength of the lid 9, the two communication holes 9 f, 9 f,... Are arranged symmetrically with respect to the two center lines X, Y, and the two ribs 9 j, which pass through the center C, 9j is preferably formed.

  In the above embodiment, the communication holes 9f, 9f,... Are provided so that the ribs 9j, 9j passing through the center C are formed, but the present invention is not limited to this. For example, a communication hole passing through the center C may be provided. However, from the viewpoint of the strength of the lid 9, it is preferable to provide a communication hole so as to avoid the center C.

  Moreover, in the said embodiment, although the communicating holes 9f, 9f, ... were formed so that it might each open in the left-right direction side surface 9e, 9e of the stopper part 9b, and the internal peripheral surface of the surrounding wall part 9a, it is not limited to this. The left and right direction side surfaces 9e, 9e or the inner peripheral surface of the peripheral wall portion 9a may be formed to open. However, since the opening area of the communication holes 9f, 9f,... Is larger than that of any one of the lateral side surfaces 9e, 9e and the inner peripheral surface of the peripheral wall 9a, the vibration isolator is manufactured. Sometimes, when the liquid L is injected, the gas A in the communication holes 9f, 9f,.

  Moreover, in the said embodiment, although the said vertical surfaces 9i, 9i, ... of the communicating holes 9f, 9f, ... were formed perpendicularly, it is not limited to this, For example, communicating holes 9f, 9f, ... May be formed so as to incline outward in the front-rear direction as they go upward, so as to approach the left and right side surfaces 9e, 9e that open. By forming in this way, when injecting the liquid L at the time of manufacturing the vibration isolator, when the communication hole 9f is arranged on the lower side, the vertical surface 9i becomes the ceiling surface of the communication hole 9f and the cylinder shaft Inclines upward as it goes outward. Then, the vertical surface 9i serves as a guide surface and guides the gas A in the communication hole 9f to the outer peripheral side of the peripheral wall portion 9a. Therefore, it is possible to more reliably suppress the gas A from accumulating in the communication hole 9f.

  Furthermore, in the said embodiment, although the four leg parts 9c, 9c, ... was provided in the cover body 9, it is not limited to this. For example, a pair of leg portions 9c and 9c may be provided on the diagonal of the peripheral wall portion 9a. However, from the viewpoint of stably attaching the lid body 9 to the rubber elastic body 3, it is preferable to provide four leg portions 9c like the lid body 9 of the above embodiment.

  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 applications that suppress the accumulation of gas in the lightening portion of the lid.

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Rubber elastic body 5 Main fluid chamber 6 Sub fluid chamber 9 Lid body 9a Peripheral wall portion 9b Stopper portion 9d Upper surface 9e Side surface 9f Communication hole

Claims (5)

An inner cylinder arranged with the cylinder axis facing sideways, an outer cylinder surrounding the inner cylinder, and interposing between the inner cylinder and the outer cylinder and connecting them together, A rubber elastic body in which a concave portion that is recessed upward and that opens downward is formed on the lower peripheral wall, a main fluid chamber that is partitioned by the rubber elastic body, is formed on the lower side, and a relatively upper side A sub-fluid chamber formed, an orifice formed on the peripheral wall of the rubber elastic body and communicating with the main fluid chamber and the sub-fluid chamber, and a resin that is fitted into the opening of the recess to form the main fluid chamber A liquid-filled vibration isolator comprising a lid made of
The lid body is formed so as to protrude along the inner peripheral surface of the outer cylindrical body, and protrudes upward from the peripheral wall section, and the relative movement in the vertical direction of the two cylindrical bodies. A stopper portion having a top surface and a side surface with which the rubber elastic body abuts, and a communication hole communicating with the main fluid chamber and the outer peripheral side of the peripheral wall portion is formed. Liquid-filled vibration isolator. The liquid-filled vibration isolator according to claim 1,
The liquid filled type vibration damping device, wherein the communication hole penetrates the lid body in a vertical direction. The liquid-filled vibration isolator according to claim 1 or 2,
Four communication holes are formed, and the outer peripheral surface of the peripheral wall portion is opened in four regions each divided into two in the cylinder axis direction and the cylinder axis orthogonal direction orthogonal to the vertical direction. A liquid-filled vibration isolator characterized by The liquid-filled vibration isolator according to any one of claims 1 to 3,
The communication hole is opened in at least one of the side surface and the inner peripheral surface of the peripheral wall portion. The liquid-filled vibration isolator according to any one of claims 1 to 4,
The liquid filled type vibration damping device, wherein the communication hole extends in a cylinder axis direction.

Images