JP2009144808A - Liquid sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid sealed vibration control device sufficiently securing a leak quantity of liquid to a main liquid chamber from a sub liquid chamber, when excessively large negative pressure is generated in the main liquid chamber. <P>SOLUTION: A liquid chamber of an engine mount is partitioned into the main liquid chamber 4 and the sub liquid chamber 5 by a partition member 10. The partition member 10 is held by a device body via a first elastic body 12, a second elastic body 13 and a peripheral edge division body 11. When negative pressure of the main liquid chamber 4 generated by inputting vibration to the engine mount is smaller than a predetermined value Pa, fluid is moved between the main liquid chamber 4 and the sub liquid chamber 5 only via an orifice passage when the volume of the main liquid chamber 4 changes in response to deformation of a vibration control body. While, when the negative pressure of the main liquid chamber 4 is larger than the predetermined value Pa, an auxiliary passage (a first space 13, a second space 24 and a third space 34) is opened by moving the partition member 10 to the main liquid chamber 4 side. Thus, the partition member 10 functions as a valve for opening the auxiliary passage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a liquid that is provided between a first structure that generates vibration and a second structure to which vibration from the structure is transmitted, and that attenuates the vibration by the movement of the liquid enclosed inside. The present invention relates to a sealed vibration isolator.

  As the liquid-filled vibration isolator, for example, one that is connected to each of the engine as the first structure and the vehicle body as the second structure to attenuate the vibration transmitted from the engine to the body. (So-called engine mount) is known.

  Here, in a conventional liquid-filled vibration isolator including such an engine mount, a storage chamber (liquid chamber) in which liquid is sealed is partitioned by a partition body, and a pressure receiving chamber (main liquid chamber) and an equilibrium chamber ( Sub-liquid chamber), and a structure in which these chambers communicate with each other through an orifice (basic passage) is employed. When vibration is input from one structure (engine) to the main liquid chamber, the liquid flows between the main liquid chamber and the sub liquid chamber through the orifice, and accordingly, the other structure (body) moves to the other liquid body (body). The transmitted vibration is attenuated.

  In such a liquid-filled vibration isolator, when an excessively large vibration is input to the main liquid chamber, the negative pressure that accompanies this is significantly increased, and cavitation occurs in the chamber. And since a vibration generate | occur | produces when the bubble by this lose | disappears, for example, in a vehicle, it comes to the problem that abnormal noise arises in a vehicle interior.

Therefore, in the liquid filled type vibration isolator described in Patent Document 1, a check valve is provided in the partition body in order to solve the above problem. According to this vibration isolator, when a negative pressure is generated in the main liquid chamber above a predetermined level due to an excessively large vibration input, the check valve opens and the liquid flows from the sub liquid chamber into the main liquid chamber. Sudden pressure fluctuations in the main liquid chamber are suppressed.
JP 2005-48906 A

  By the way, the liquid-filled vibration isolator of the above-mentioned Patent Document 1 is basically about the amount of liquid (leakage amount) flowing from the sub liquid chamber to the main liquid chamber when a large negative pressure is generated in the main liquid chamber. The structure is determined according to the physique of the check valve. On the other hand, the physique is naturally restricted by the structure of the compartment to which the check valve is attached. Has become difficult. For this reason, when an excessively large negative pressure is generated in the main liquid chamber, a sufficient amount of leak is not secured, and it is assumed that cavitation is caused accordingly.

  The present invention has been made in view of such circumstances, and its purpose is to sufficiently reduce the amount of liquid leakage from the sub liquid chamber to the main liquid chamber when an excessively large negative pressure is generated in the main liquid chamber. It is an object of the present invention to provide a liquid-filled vibration isolator that can be secured in a safe manner.

In the following, means for achieving the above object and its effects are described.
(1) According to the first aspect of the present invention, the transmitted vibration is provided between the first structure that generates vibration and the second structure to which vibration from the structure is transmitted. An apparatus main body which is provided with a liquid chamber which is connected to the first structure body and the second structure body and in which a liquid is sealed, and the liquid chamber is disposed in the first structure body. A liquid chamber compartment that divides into a main liquid chamber located on the structure side and a sub liquid chamber located on the second structure side; the first structure and the main liquid chamber as part of the apparatus main body; And a vibration isolator that is deformed with the vibration of the first structure, and when the negative pressure of the main liquid chamber is smaller than a predetermined value, When the volume of the liquid chamber changes, fluid is moved between the main liquid chamber and the sub liquid chamber only through the basic passage. When the negative pressure in the main liquid chamber is larger than the predetermined value, a liquid-filled type anti-reflection system that moves fluid between the main liquid chamber and the sub liquid chamber via an auxiliary passage provided separately from the basic passage. The gist is that the liquid chamber partition functions as a valve for opening and closing the auxiliary passage.

  According to the above invention, since the liquid chamber compartment having a larger physique than the check valve generally functions as a valve for opening and closing the auxiliary passage, the passage area of the auxiliary passage can be set larger accordingly. Therefore, when an excessively large negative pressure is generated in the main liquid chamber, a sufficient amount of liquid leakage from the sub liquid chamber to the main liquid chamber can be secured.

(2) The invention according to claim 2 is characterized in that, in the liquid-filled vibration isolator according to claim 1, the auxiliary passage has a passage area larger than that of the basic passage.
(3) The invention described in claim 3 is the liquid-filled vibration isolator according to claim 1 or 2, wherein the liquid chamber partition has a negative pressure in the main liquid chamber of less than the predetermined value or more. The main point is that it moves toward the main liquid chamber with the change to the above and opens the auxiliary passage through this movement.

  (4) According to a fourth aspect of the present invention, in the liquid-filled vibration isolator according to any one of the first to third aspects, the auxiliary passage is formed between the device main body and the peripheral edge of the liquid chamber partition. The gist is that it is provided in between.

  (5) The invention according to claim 5 is the liquid-filled vibration isolator according to any one of claims 1 to 4, wherein the liquid chamber partition is provided in the sub liquid chamber and the liquid It is supported by a support that seals between the chamber compartment and the auxiliary passage, and an elastic body that is provided in the main liquid chamber and maintains the force that presses the liquid compartment compartment against the support. When the negative pressure in the main liquid chamber is smaller than the predetermined value, the elastic body is pressed against the support to keep the auxiliary passage closed, and the negative pressure in the main liquid chamber is When the value is larger than a predetermined value, the elastic body is deformed along with the movement from the sub liquid chamber side toward the main liquid chamber side, thereby forming a space between the support body and the auxiliary passage, thereby the auxiliary. The gist is to maintain the passage open. To have.

  (6) The invention according to claim 6 is the liquid-filled vibration isolator according to claim 5, provided on the inner periphery of the apparatus main body, between the periphery of the liquid chamber partition and the apparatus main body. The gist of the present invention is to provide a peripheral partition that separates the two.

  (7) The invention according to claim 7 is the liquid-filled vibration isolator according to claim 6, wherein the auxiliary passage is formed between a peripheral edge of the liquid chamber partition body and the peripheral partition body. The gist is that it is.

  (8) The invention according to claim 8 is the liquid-filled vibration isolator according to claim 6 or 7, wherein the basic passage is formed between an inner periphery of the device main body and the peripheral partition body. The gist is that it is.

  (9) The invention according to claim 9 is the liquid-filled vibration isolator according to any one of claims 6 to 8, wherein the support is attached to the peripheral partition. It is said.

  (10) The invention according to claim 10 is the liquid-filled vibration isolator according to claim 9, wherein the peripheral partition is a surface of the liquid chamber partition on the side of the sub liquid chamber. The sub-liquid projecting portion that opposes the space through a space is formed, and the support is attached to the sub-liquid projecting portion and is arranged on the entire periphery of the liquid chamber partition. The gist is that the space between the liquid chamber partition and the auxiliary passage is sealed by filling the space between the liquid surface and the auxiliary liquid protrusion.

  (11) The invention described in claim 11 is the liquid-filled vibration isolator according to any one of claims 6 to 10, wherein the elastic body is attached to the peripheral partition body. It is said.

  (12) The invention according to claim 12 is the liquid-filled vibration isolator according to claim 11, wherein the peripheral partition is the main liquid chamber side surface of the liquid chamber partition. The main liquid projecting portion that is opposed to the main liquid projecting portion through a space is formed, and the elastic body is attached to the main liquid projecting portion and is part of the periphery of the liquid chamber partitioning body. The main liquid chamber and the auxiliary passage communicate with each other by filling the space between the main liquid surface and the main liquid protrusion and securing the space in another part of the periphery of the liquid chamber partition. The gist is that the liquid chamber compartment is pressed against the support while maintaining the state.

  (13) The invention according to claim 13 is the liquid-filled vibration isolator according to claim 12, wherein the elastic body has a shape corresponding to the shape of the peripheral edge of the liquid chamber partition and a part thereof. The gist is that the cutout is provided, and that the cutout maintains a state where the main liquid chamber and the auxiliary passage communicate with each other.

  (14) The invention according to claim 14 is the liquid-filled vibration isolator according to any one of claims 1 to 13, wherein the rigidity of the central portion of the liquid chamber partition is smaller than the rigidity of the periphery. The gist is to be set.

  According to the above invention, since the rigidity of the central portion of the liquid chamber partition is set smaller than the rigidity of the peripheral edge, the pressure fluctuation in the main liquid chamber is absorbed in the central portion so that the vibration isolation performance can be improved. become.

(First embodiment)
A first embodiment in which the liquid-filled vibration isolator according to the present invention is embodied as an automobile engine mount will be described with reference to FIGS.

  As shown in FIG. 1, the engine mount 1 includes a vehicle body side bracket 2 made of a bottomed cylindrical metal member that is an attachment member on the vehicle body side, and an engine side made of a disk-shaped metal member that is an attachment member on the engine side. The bracket 3 is configured to include a vibration isolator 7 made of a bottomed cylindrical rubber member that connects the brackets. A substantially circular diaphragm 8 having a flexible film is attached to the inside of the vehicle body side bracket 2, and a liquid chamber 6 in which liquid is sealed is formed between the diaphragm 8 and the vibration isolator 7. Has been. The vibration isolator 7 and the vehicle body side bracket 2 correspond to the apparatus main body.

  Specifically, the vehicle body side bracket 2 is formed as a bottomed cylindrical member by a bottom member 2a constituting a bottom portion and a cylindrical member 2b constituting a cylindrical portion on the top. A vehicle body side mounting bolt 2c for fixing the engine mount 1 to the vehicle body is attached to the bottom member 2a. A flange portion 2e is formed at the opening end portion of the bottom member 2a so as to protrude outward in the radial direction. A through hole 2d is formed in the side wall of the bottom member 2a to communicate the space defined between the bottom member 2a and the diaphragm 8 and the outside.

  The cylindrical member 2b includes a caulking portion 2f fitted to the bottom member 2a, a cylindrical portion 2g continuous to the caulking portion 2f, and an enlarged diameter that increases in diameter as it goes to the vibration isolator 7 continuously from the cylindrical portion 2g. It is comprised by the diameter part 2h. The vibration isolator 7 is vulcanized and bonded to the cylindrical portion 2g and the enlarged diameter portion 2h.

  The engine-side bracket 3 has a bolt 3a for fixing the engine mount 1 to the engine at the center, and a positioning pin 3b for positioning the engine mount 1 on the outer side of the bolt 3a. Is attached. Further, the upper surface of the vibration isolator 7 is vulcanized and bonded to the lower surface of the engine side bracket 3, whereby the vehicle body side bracket 2 and the engine side bracket 3 are integrated via the vibration isolator 7.

  The diaphragm 8 is formed of a flexible film, and its peripheral portion is vulcanized and bonded to a holding frame 9 formed in an annular shape with metal. Moreover, it fixes to the said caulking part 2f with the outward protrusion part 33 of the peripheral division body 11, and the flange part 2e of the bottom member 2a.

  The liquid chamber 6 is fixed to a cylindrical partition member 2b and a metal partition member 10 that partitions the liquid chamber 6 into a space on the engine side (main liquid chamber 4) and a space on the vehicle body side (sub liquid chamber 5). A peripheral partitioning body 11 that supports the partition member 10 is provided. The partition member 10 corresponds to a liquid chamber compartment.

  The peripheral partition body 11 is provided on the inner peripheral surface 7 a side of the vibration isolator 7, and the main liquid chamber side partition body 20 positioned in the main liquid chamber 4 and the sub liquid chamber side partition body positioned in the sub liquid chamber 5. 30. The main liquid chamber-side partition body 20 is provided with a first elastic body 12 made of rubber. The secondary liquid chamber side partition 30 is provided with a second elastic body 13 made of rubber. Further, an orifice passage 18 that communicates the main liquid chamber 4 and the sub liquid chamber 5 is provided between the main liquid chamber side section 20 and the sub liquid chamber side section 30 and the inner peripheral surface 7 a of the vibration isolator 7. A part of the outer peripheral groove 15 is formed.

  The partition member 10 is supported between the main liquid chamber side partition 20 and the sub liquid chamber side partition 30 while being pressed against each other by the first elastic body 12 and the second elastic body 13. Further, it is supported in a state in which a space (first space 14) is formed between the main liquid chamber side partition body 20 and the sub liquid chamber side partition body 30 over the entire circumference of its own periphery.

  The main liquid chamber side partition body 20 is a main body surface which is a surface of the partition body 10 on the main liquid chamber 4 side, and a partition main body 21 which forms the main body of the partition body 20 with the vehicle body side bracket 2 and the partition member 10 separated from each other. About 10A, the main liquid protrusion 22 protrudes radially inward from the partition main body 21 so as to face the space through the space, and the outer side protrudes radially outward from the partition main body 21 and is fixed to the vibration isolator 7. It is comprised by the protrusion part 23. FIG. The first elastic body 12 is attached to the main liquid protrusion 22.

  The secondary liquid chamber side partition 30 is a partition main body 31 that forms the main body of the partition 30 by separating the vehicle body side bracket 2 and the partition member 10, and a secondary liquid surface that is a surface of the partition member 10 on the secondary liquid chamber 5 side. 10B, a secondary liquid protrusion 32 that protrudes radially inward from the partition body 31 so as to face this through a space, and an outward protrusion that protrudes radially outward from the partition body 31 and fits into the caulking portion 2f. 33. The second elastic body 13 is attached to the secondary liquid protrusion 32.

  Between the main liquid chamber side compartment 20 and the sub liquid chamber side compartment 30 and the vehicle body side bracket 2, the main liquid chamber 4 and the sub liquid chamber 5 are always in communication, and the liquid moves between these chambers. An orifice passage 18 is provided to allow The orifice passage 18 is provided in the outward projecting portion 23 of the main liquid chamber side partition 20 to communicate the main liquid chamber 4 and the outer peripheral groove 15, and the partition main body 31 of the sub liquid chamber side partition 30. And an orifice 17 that communicates the auxiliary liquid chamber 5 with the outer circumferential groove 15, and the outer circumferential groove 15. The orifice passage 18 corresponds to a basic passage.

  With reference to FIGS. 2-4, the detail of the structure of the partition member 10 and the peripheral division body 11, and its periphery structure is demonstrated. 2A shows the planar structure of the partition member 10 and the peripheral partition body 11 as viewed from the engine side bracket 3 side, and FIG. 2B shows the partition member 10 and the peripheral partition body as viewed from the vehicle body side bracket 2 side. 11 planar structures are shown respectively.

  As shown in FIG. 2A, the first elastic body 12 is formed as an annular element corresponding to the shape of the peripheral edge 10 a of the partition member 10. Further, a convex portion 12A protruding radially inward and a concave portion 12B recessed radially outward with respect to the convex portion 12A are provided. The recess 12B is formed by providing a cutout in a part of the first elastic body 12, and a plurality of the recesses 12B are formed at positions symmetrical with respect to the center C.

  As shown in FIG. 3, the contact portion 12a of the convex portion 12A contacts the main liquid surface 10A of the partition member 10, and a space (second space 24) is formed between the concave portion 12B and the main liquid surface 10A. It is formed. In other words, the first elastic body 12 fills the space between the main liquid surface 10A and the main liquid protrusion 22 in a part of the peripheral edge 10a of the partition member 10, and the main liquid chamber 4 and the first part in another part. The space 14 is in communication with the second space 24.

  As shown in FIG. 2B, the second elastic body 13 is formed as an annular element corresponding to the shape of the peripheral edge 10 a of the partition member 10, and the thickness is substantially the same over the entire circumference. A contact portion 13a is provided. Then, the space between the partition member 10 and the first space 14 is sealed by maintaining the state in which the auxiliary liquid level 10B and the contact portion 13a are in contact with each other at the entire periphery 10a of the partition member 10. That is, the second elastic body 13 fills the space between the auxiliary liquid surface 10B and the auxiliary liquid protrusion 32 in the entire peripheral edge 10a of the partition member 10, whereby the auxiliary liquid chamber 5 and the first space 14 are separated. Maintains a state of no communication.

  In the engine mount 1, as described above, the partition member 10 is supported by the first elastic body 12 and the second elastic body 13, and the main liquid chamber side compartment 20 and the sub liquid chamber are deformed through deformation of these elastic bodies. A structure that allows a change in the position of the partition member 10 relative to the side partition 30 is employed.

  Then, when the partition member 10 is pushed toward the sub liquid chamber 5 by the pressure from the main liquid chamber 4, and the second elastic body 13 is compressed and deformed by this, as shown in FIG. Since the contact between the contact portion 13a of the elastic body 13 and the secondary liquid surface 10B of the partition member 10 is maintained, the secondary liquid chamber 5 and the first space 14 are still maintained in a state of not communicating with each other. At this time, the first elastic body 12 is deformed following the movement of the partition member 10, so that the contact between the contact portion 12a of the first elastic body 12 and the main liquid surface 10A is still maintained. On the other hand, when the partition member 10 is pulled to the main liquid chamber 4 side by the negative pressure of the main liquid chamber 4, and the first elastic body 12 is greatly compressed and deformed by this, as shown in FIG. The contact between the contact portion 13a of the elastic body 13 and the secondary liquid surface 10B of the partition member 10 is released, and a third space 34 is formed between the secondary liquid surface 10B and the contact portion 13a. At this time, the auxiliary liquid chamber 5 and the first space 14 are communicated with each other by the third space 34, and the main liquid chamber 4 and the first space 14 are communicated with each other by the second space 24. Movement of the liquid between the liquid chamber 4 and the sub liquid chamber 5 is allowed. That is, when the partition member 10 is separated from the second elastic body 13, the main liquid chamber 4 is separated from the orifice passage 18 by the first space 14, the second space 24, and the third space 34. An auxiliary passage 19 that communicates with the auxiliary liquid chamber 5 is formed. In other words, in the engine mount 1, the partition member 10 functions as a valve body that switches the open / close state of the auxiliary passage 19, and communicates the open / close state between the main liquid chamber 4 and the sub liquid chamber 5. Switching between the open state and the closed state in which the main liquid chamber 4 and the sub liquid chamber 5 do not communicate with each other is performed.

The operation of the engine mount 1 will be described with reference to FIGS. 1, 3, and 4.
When vibration is input from the engine to the engine mount 1, the volume of the main liquid chamber 4 changes with the deformation of the vibration isolator 7, thereby changing the pressure of the liquid in the main liquid chamber 4.

  Here, the pressure in the main liquid chamber 4 increases with the change in the pressure, and when the pressure in the main liquid chamber 4 exceeds the pressure in the sub liquid chamber 5, the partition member 10 is The pressure acts in the direction of the arrow A of 3 and the partition member 10 is pressed against the second elastic body 13 of the auxiliary liquid chamber 5. Thereby, since the contact part 13a of the 2nd elastic body 13 is maintained in the state which contacted the secondary liquid level 10B, between the partition member 10 and the 1st space 14 is sealed, and the auxiliary | assistant channel | path 19 is formed. That is, the closed state of the auxiliary passage 19 is maintained. Further, when the liquid in the main liquid chamber 4 is pressurized, a part thereof moves to the sub liquid chamber 5 through the orifice passage 18. The increase in the amount of liquid in the sub liquid chamber 5 due to the movement is absorbed by the change in the volume of the sub liquid chamber 5 due to the deformation of the diaphragm 8.

  On the other hand, when the pressure in the main liquid chamber 4 decreases and a negative pressure is generated in the main liquid chamber 4, and thus the pressure in the main liquid chamber 4 falls below the pressure in the sub liquid chamber 5, the partition member 10 is applied to the partition member 10 by the first elastic body 12 of the main liquid chamber 4.

  Here, when the negative pressure in the main liquid chamber 4 is smaller than the predetermined value Pa, a pressure is applied to move the partition member 10 in the direction of arrow B, but the partition member 10 is the second elastic body 13. Held in contact with the That is, the state in which the contact portion 13a of the second elastic body 13 and the secondary liquid surface 10B are in contact with each other is maintained, and the secondary liquid chamber 5 and the first space 14 are sealed by the second elastic body 13. Therefore, the closed state of the auxiliary passage 19 is maintained. Accordingly, a part of the liquid in the sub liquid chamber 5 moves to the main liquid chamber 4 only through the orifice passage 18. The decrease in the amount of liquid due to the liquid moving portion in the sub liquid chamber 5 is absorbed by the change in the volume of the sub liquid chamber 5 due to the deformation of the diaphragm 8. In this way, the vibration generated between the vehicle body side bracket 2 and the engine side bracket 3 connected via the vibration isolator 7 causes the orifice passage 18 between the main liquid chamber 4 and the sub liquid chamber 5. It is absorbed by the movement of the liquid through it.

  By the way, when an excessively large vibration is input to the engine mount 1, the negative pressure generated in the main liquid chamber 4 is remarkably increased. And when the negative pressure by this becomes more than predetermined value Pa, the partition member 10 is the main liquid with respect to the main liquid chamber side division body 20 and the sub liquid chamber side division body 30 with the pressure which acts in the arrow B direction. With the movement toward the chamber 4 side, the first elastic body 12 is compressed and deformed, and the partition member 10 is separated from the second elastic body 13. As a result, a third space 34 is formed between the secondary liquid surface 10B and the second elastic body 13, and the first space 14 and the peripheral partition body 11 are separated between the peripheral edge 10a and the peripheral partitioning body 11. An auxiliary passage 19 composed of the second space 24 and the third space 34 is formed. As a result, liquid leaks from the auxiliary liquid chamber 5 to the main liquid chamber 4 through the auxiliary passage 19, and due to this liquid leakage, the shortage of the liquid amount in the main liquid chamber 4 due to the generation of an excessively large negative pressure is suppressed. The

  Here, the passage area of the auxiliary passage 19 is set to be sufficiently larger than the passage area of the orifice passage 18, thereby securing a sufficient amount of liquid leakage from the sub liquid chamber 5 to the main liquid chamber 4. It is possible to do. The predetermined value Pa is the smallest of the negative pressures that cause cavitation in the main liquid chamber 4. This basically opens the auxiliary passage 19 before cavitation occurs in the main liquid chamber 4. A large amount of liquid leaks from the secondary liquid chamber 5 to the main liquid chamber 4 through the passage 19. The rigidity of the partition member 10, the first elastic body 12, and the second elastic body 13 is such that the auxiliary passage 19 is opened as the negative pressure in the main liquid chamber 4 changes from less than a predetermined value Pa to more than that. Each is set to

According to 1st Embodiment described above, there can exist the following effects.
(1) In this embodiment, the partition member 10 functions as a valve that opens and closes the auxiliary passage 19. As a result, the partition member 10 having a larger physique than the check valve generally functions as a valve for opening and closing the auxiliary passage 19, so that the passage area of the auxiliary passage 19 can be set larger accordingly. Therefore, when an excessively large negative pressure is generated in the main liquid chamber 4, a sufficient amount of liquid leakage from the sub liquid chamber 5 to the main liquid chamber 4 can be secured.

  (2) In this embodiment, when the negative pressure of the main liquid chamber 4 is smaller than the predetermined value Pa, the orifice passage 18 which is a basic passage when the volume of the main liquid chamber 4 changes with the deformation of the vibration isolator 7. Since the fluid is moved between the main liquid chamber 4 and the sub liquid chamber 5 only through the above, relatively small vibrations input to the engine mount 1 can be sufficiently damped.

  (3) In the present embodiment, when the negative pressure in the main liquid chamber 4 is greater than the predetermined value Pa, the main liquid chamber 4 and the auxiliary liquid chamber 5 are interposed via the auxiliary passage 19 provided separately from the orifice passage 18. Move the fluid with. Therefore, when an excessively large negative pressure is generated in the main liquid chamber 4, a sufficient amount of liquid leakage from the sub liquid chamber 5 to the main liquid chamber 4 can be secured. Moreover, since it can suppress that the pressure in the main liquid chamber 4 falls large, it becomes possible to suppress that cavitation occurs in the main liquid chamber 4.

(Second Embodiment)
With reference to FIG. 5, a second embodiment in which the liquid filled vibration isolator according to the present invention is embodied as an engine mount of a vehicle will be described. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The liquid-filled vibration isolator according to this embodiment differs from the liquid-filled vibration isolator according to the first embodiment in the following points. That is, in the first embodiment, the partition member 10 is formed in a manner in which the overall rigidity is substantially the same, whereas in the second embodiment, the rigidity of the central portion is higher than the rigidity of the periphery. The partition member 40 is formed so as to be smaller.

  Specifically, the partition member 40 is configured by a peripheral portion 42 sandwiched between the first elastic body 12 and the second elastic body 13 and a film portion 41 provided in an inner portion of the peripheral portion 42. Yes. The peripheral edge portion 42 is formed of metal, and the film portion 41 is formed of a flexible film, whereby the rigidity of the central portion of the partition member 40 is set smaller than the rigidity of the peripheral edge. This film part 41 adjusts a slight difference in internal pressure between the main liquid chamber 4 and the sub liquid chamber 5. In the present embodiment as well, when the negative pressure in the main liquid chamber 4 becomes larger than the predetermined value Pa, the partition member 40 is placed in the main liquid chamber with respect to the main liquid chamber side compartment 20 and the sub liquid chamber side compartment 30. 4, the rigidity of the partition member 40, the first elastic body 12, and the second elastic body 13 is set.

According to the second embodiment described above, the following functions and effects can be achieved in addition to the functions and effects (1) to (3) according to the first embodiment.
(4) In the present embodiment, the rigidity of the central part (film part 41) of the partition member 40 is set to be smaller than the rigidity of the peripheral edge (peripheral part 42). The film portion 41 absorbs the vibration, so that the vibration isolation performance can be further improved.

(Other embodiments)
In addition, the embodiment of the liquid-filled vibration isolator according to the present invention is not limited to the configuration exemplified in each of the above-described embodiments. For example, the following embodiment is appropriately modified as follows. It can also be implemented.

  In each of the above embodiments, the example in which the first elastic body 12 is formed of rubber has been shown. However, the first elastic body 12 may be a member that can be elastically deformed as the partition members 10 and 40 move toward the main liquid chamber 4, and is not necessarily rubber. For example, a spring may be employed as the elastic member, and the partition member 10 may be supported by the spring 50 as shown in FIG. The urging force of the spring 50 is set so as to contract when the negative pressure in the main liquid chamber 4 becomes larger than a predetermined value Pa. Even in this case, the contact portion 13a of the second elastic body 13 is maintained in contact with the sub liquid surface 10B by being pressed by the spring 50, and the sub liquid chamber 5 and the first space 14 are maintained. Since the space is sealed by the second elastic body 13, the auxiliary passage 19 is maintained in a closed state. Therefore, even in this case, the effects (1) to (4) according to the above embodiment can be achieved.

  In each of the above embodiments, the second elastic body 13 is formed of rubber that is an elastic member. However, the second elastic body 13 is not necessarily required to be an elastic member. For example, a metal support may be used as long as the space between the secondary liquid chamber 5 and the first space 14 can be sealed. Even in this case, the effects (1) to (4) according to the above embodiment can be achieved.

  In each of the above embodiments, the first elastic body 12 is formed in a substantially annular shape, and the example in which the concave portion 12B is formed by the notch is shown. However, the 1st elastic body 12 should just be the structure which can press and support the partition members 10 and 40 to the 2nd elastic body 13 side by the contact part 12a, for example, comprises the contact part 12a. You may employ | adopt the aspect which provides multiple 1st elastic bodies 12 along the main liquid protrusion part 22 of the main liquid chamber side division body 20. As shown in FIG.

  In each of the above-described embodiments, in the first elastic body 12, the example in which the plurality of concave portions 12B are formed at four positions at positions symmetrical with respect to the center C has been described. However, the concave portion 12B may be in a form in which the second space 24 constituting a part of the auxiliary passage 19 is formed, and the formation position and the number of the concave portions 12B may be modified. Even in this case, the first elastic body 12 forms a space between the main liquid surfaces 10A and 40A and the main liquid protrusion 22 in a part of the peripheral edge 10a (peripheral part 42) of the partition members 10 and 40. In addition, the main liquid chamber 4 and the auxiliary passage 19 can be maintained in communication with each other by the second space 24 in another part.

  In each of the above-described embodiments, the auxiliary passage 19 is provided between the peripheral partitioning body 11 and the peripheral edges 10a and 40a of the partition members 10 and 40. However, the first elastic body 12 and the second elastic body 13 are directly attached to the apparatus main body (at least one of the vibration isolator 7 and the vehicle body side bracket 2) without providing the peripheral partition body 11, and the main liquid chamber In addition to providing an orifice passage 18 that communicates with 4 and the auxiliary liquid chamber 5, an auxiliary passage 19 can be formed between the apparatus main body and the peripheral edges 10 a and 40 a of the partition members 10 and 40 separately from the passage.

  In each of the above embodiments, the present invention is embodied as an engine mount, but the application target of the present invention is not limited to this. In short, in addition to the orifice passage, a liquid-filled vibration isolator having an auxiliary passage communicating with the main liquid chamber and the sub liquid chamber, which opens and closes depending on the relationship between the pressure in the main liquid chamber and the pressure in the sub liquid chamber. For example, the present invention can be applied to any of them, and even in that case, the operational effects according to the above embodiment can be obtained.

1 is a longitudinal sectional view of an engine mount according to a first embodiment of the present invention. (A) is the top view, (b) is the bottom view about the peripheral structure of the partition member and peripheral division body in the engine mount of the embodiment. Sectional drawing which shows the cross-sectional structure which follows the 3-3 line | wire of FIG. 2 about the engine mount of the embodiment. Sectional drawing which shows the cross-sectional structure in the state which is a cross-sectional structure in alignment with the 3-3 line | wire of FIG. 2, and the partition member moved from the state of FIG. Sectional drawing which shows the cross-sectional structure equivalent to the cross-sectional structure in alignment with the 3-3 line of FIG. 2 about the engine mount concerning the 2nd Embodiment of this invention. The longitudinal cross-sectional view which shows the modification of the engine mount concerning this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine mount, 2 ... Car body side bracket, 2a ... Bottom member, 2b ... Cylindrical member, 2c ... Car body side mounting bolt, 2d ... Through hole, 2e ... Flange part, 2f ... Caulking part, 2g ... Cylindrical part, 2h ... enlarged diameter part, 3 ... engine side bracket, 3a ... bolt, 3b ... pin, 4 ... main liquid chamber, 5 ... sub liquid chamber, 6 ... liquid chamber, 7 ... vibration isolator, 7a ... inner peripheral surface, 8 ... Diaphragm, 9 ... Holding frame, 10, 40 ... Partition member, 10a, 40a ... Periphery, 10A, 40A ... Main liquid surface, 10B ... Sub-liquid surface, 11 ... Periphery partition, 12 ... First elastic body, 12A ... Convex part, 12B ... concave part, 12a, 13a ... abutting part, 13 ... second elastic body, 14 ... first space, 15 ... outer peripheral groove, 16, 17 ... orifice, 18 ... orifice path, 19 ... auxiliary passage 20 ... main liquid chamber side compartments, 21, 31 ... compartment main body, 22 ... main liquid protrusion, 3, 33 ... Outward projecting part, 24 ... Second space, 30 ... Sub liquid chamber side partition, 32 ... Sub liquid projecting part, 34 ... Third space, 41 ... Membrane part, 42 ... Peripheral part, 50 …spring.

Claims (14)

Provided between a first structure that generates vibration and a second structure to which vibration from the structure is transmitted, to attenuate the transmitted vibration;
An apparatus main body provided inside with a liquid chamber connected to the first structure and the second structure and filled with a liquid, and a main liquid in which the liquid chamber is located on the first structure side A liquid chamber compartment that divides into a chamber and a secondary liquid chamber located on the second structure side, and is provided between the first structure and the main liquid chamber as a part of the apparatus main body. A vibration isolator that deforms with vibration of the first structure,
When the negative pressure of the main liquid chamber is smaller than a predetermined value, the main liquid chamber, the sub liquid chamber, and the sub liquid chamber are connected via the basic passage only when the volume of the main liquid chamber changes with deformation of the vibration isolator. Between the main liquid chamber and the auxiliary liquid chamber via an auxiliary passage provided separately from the basic passage when the negative pressure of the main liquid chamber is greater than the predetermined value. In a liquid-filled vibration isolator that moves fluid,
The liquid-filled vibration isolator, wherein the liquid chamber partition functions as a valve that opens and closes the auxiliary passage. The liquid-filled vibration isolator according to claim 1,
The liquid-filled vibration isolator, wherein the auxiliary passage has a larger passage area than the basic passage. The liquid-filled vibration isolator according to claim 1 or 2,
The liquid chamber compartment moves toward the main liquid chamber as the negative pressure of the main liquid chamber changes from less than the predetermined value to more than the predetermined value, and opens the auxiliary passage through this movement. A liquid-filled vibration isolator characterized by that. In the liquid enclosure type vibration isolator as described in any one of Claims 1-3,
The auxiliary passage is provided between the apparatus main body and a peripheral edge of the liquid chamber partition body. In the liquid enclosure type vibration isolator as described in any one of Claims 1-4,
The liquid chamber partition is provided in the sub liquid chamber and seals between the liquid chamber partition and the auxiliary passage, and is provided in the main liquid chamber and supports the liquid chamber partition. And is supported by an elastic body that maintains a pressing force against the body. When the negative pressure in the main liquid chamber is smaller than the predetermined value, the elastic body is pressed against the support body to close the auxiliary passage. When the negative pressure of the main liquid chamber is larger than the predetermined value, the elastic body is deformed as the main liquid chamber moves from the sub liquid chamber side toward the main liquid chamber side. A liquid-filled vibration damping device, wherein a space is formed between a support and the auxiliary passage to maintain the auxiliary passage open. The liquid-filled vibration isolator according to claim 5,
A liquid-filled vibration isolator comprising a peripheral partition provided on the inner periphery of the device main body and separating the peripheral edge of the liquid chamber partition from the device main body. The liquid-filled vibration isolator according to claim 6,
The auxiliary passage is formed between a peripheral edge of the liquid chamber partition and the peripheral partition. The liquid-filled vibration isolator. The liquid-filled vibration isolator according to claim 6 or 7,
The said basic channel is formed between the inner periphery of the said apparatus main body, and the said peripheral division body. The liquid enclosure type vibration isolator characterized by the above-mentioned. In the liquid enclosure type vibration isolator as described in any one of Claims 6-8,
The liquid support type vibration isolator, wherein the support body is attached to the peripheral partition body. The liquid-filled vibration isolator according to claim 9,
The peripheral partition body is configured to include a secondary liquid protrusion that faces the secondary liquid surface, which is a surface on the secondary liquid chamber side of the liquid chamber partition body, through a space,
The support body is attached to the sub-liquid projecting portion and fills the space between the sub-liquid surface and the sub-liquid projecting portion at the entire periphery of the liquid chamber partition body. A liquid-filled vibration isolator that seals between the auxiliary passage. In the liquid enclosure type vibration isolator as described in any one of Claims 6-10,
The elastic body is attached to the peripheral partition body. The liquid-filled vibration isolator according to claim 11,
The peripheral partition body is configured to include a main liquid projecting portion facing the main liquid surface, which is a surface on the main liquid chamber side of the liquid chamber partition body, through a space,
The elastic body is attached to the main liquid protrusion and fills the space between the main liquid surface and the main liquid protrusion at a part of the periphery of the liquid chamber partition and By securing the space in another part of the periphery, the liquid chamber compartment is pressed against the support while maintaining the state in which the main liquid chamber and the auxiliary passage are in communication with each other. Liquid-filled vibration isolator. The liquid filled vibration isolator according to claim 12,
The elastic body has a shape corresponding to the shape of the peripheral edge of the liquid chamber partition and a shape in which a cutout is provided in a part thereof, and the main liquid chamber and the auxiliary passage communicate with each other through the cutout. A liquid-filled vibration isolator characterized by maintaining the above. In the liquid enclosure type vibration isolator as described in any one of Claims 1-13,
The liquid filled type vibration damping device, wherein a rigidity of a central portion of the liquid chamber partition is set to be smaller than a rigidity of a peripheral edge.

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