Anti-vibration device

Abstract

To suppress the oxidization of an elastic body.SOLUTION: An antivibration device 1 includes a cylindrical first mounting member 11 to be connected to one of a vibration generation part and a vibration receiving part and a second mounting part 12 connected to the other, an elastic body 13 connecting the first mounting member and the second mounting member, and a partition member 16 partitioning a liquid chamber 19 in the first mounting member into a first liquid chamber 14 having the elastic body in part of a partition wall and a second liquid chamber 15 along the axial direction running along a central axis O of the first mounting member, and formed with an orifice passage 17 to communicate the first liquid chamber and the second liquid chamber with each other. Herein, a deformable shield body 21 is provided for connecting the first mounting member and the second mounting member and covering the elastic body from the opposite side of the first liquid chamber along the axial direction. A shield chamber 22 defined between the shield body and the elastic body in the axial direction is shut off from the liquid chamber.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an anti-vibration device. [Background technology]

[0002] A known conventional vibration-damping device of this type includes a cylindrical first mounting member connected to either the vibration generating section or the vibration receiving section, a second mounting member connected to the other, an elastic body connecting the first and second mounting members, and a partition member that divides the liquid chamber in the first mounting member into a first liquid chamber having the elastic body as part of a dividing wall and a second liquid chamber along the axial direction of the central axis of the first mounting member. An orifice passage is formed in the partition member, connecting the first and second liquid chambers. In this vibration-damping device, when vibration is input, the first and second mounting members elastically deform the elastic body and displace relative to each other, changing the liquid pressure in the first liquid chamber and causing liquid to flow through the orifice passage, thereby damping and absorbing the vibration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-116920 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional vibration-damping device, the elastic body oxidizes when placed at high temperatures, which can cause the relative axial positions of the first and second mounting members to change over time, potentially resulting in the device no longer providing the desired vibration-damping performance.

[0005] The present invention has been made in consideration of the above circumstances, and has as its object to provide a vibration-damping device that can suppress oxidation of the elastic body. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above object, the vibration-damping device of the present invention comprises a cylindrical first mounting member connected to either the vibration generating part or the vibration receiving part, and a second mounting member connected to the other, an elastic body connecting the first mounting member and the second mounting member, and a partition member that divides the liquid chamber in the first mounting member along the axial direction along the central axis of the first mounting member into a first liquid chamber having the elastic body as part of a partition wall, and a second liquid chamber, and has an orifice passage formed therein that connects the first liquid chamber and the second liquid chamber, wherein a deformable shielding body is provided that connects the first mounting member and the second mounting member and covers the elastic body from the opposite side of the first liquid chamber along the axial direction, and the shielding chamber defined by being sandwiched between the shielding body and the elastic body in the axial direction is blocked from the liquid chamber.

[0007] A deformable shield is provided that connects the first mounting member and the second mounting member and covers the elastic body from the opposite side of the first liquid chamber along the axial direction.The shielding chamber defined by the shield and the elastic body in the axial direction makes it possible to prevent the elastic body from coming into contact with the outside air, thereby suppressing oxidation of the elastic body. Since the shielding chamber is isolated from the liquid chamber, it is possible to prevent changes in vibration-damping performance due to the provision of the shielding chamber, and the device can be easily applied to existing vibration-damping devices, for example.

[0008] The internal volume of the shielding chamber may be smaller than the internal volumes of the first liquid chamber and the second liquid chamber.

[0009] Since the internal volume of the shielding chamber is smaller than the internal volumes of the first and second liquid chambers, the provision of the shielding chamber can prevent the vibration-damping device from becoming bulky in the axial direction.

[0010] The shielding body may be formed integrally with the elastic body using the same material.

[0011] Since the shielding body is integrally formed from the same material as the elastic body, the vibration-damping device can be easily formed, and the shielding body can be smoothly deformed in accordance with the relative displacement of the first mounting member and the second mounting member.

[0012] The shielded chamber may be filled with the same liquid as that filled in the liquid chamber.

[0013] Since the shielding chamber is filled with the same liquid as that filled in the liquid chamber, the vibration isolation device can be easily formed. [Effects of the Invention]

[0014] According to this invention, oxidation of the elastic body can be suppressed. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view of an anti-vibration device shown as an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of a vibration isolation device according to the present invention will be described below with reference to FIG. The vibration-damping device 1 is a liquid-filled vibration-damping device that includes a cylindrical first mounting member 11 that is connected to either the vibration generating part or the vibration receiving part, a second mounting member 12 that is connected to the other, an elastic body 13 that connects the first mounting member 11 and the second mounting member 12, and a partition member 16 that divides the inside of the first mounting member 11 into a main liquid chamber (first liquid chamber) 14 and an auxiliary liquid chamber (second liquid chamber) 15, which will be described later. When this vibration isolation device 1 is mounted on an automobile, for example, the second mounting member 12 is connected to the engine as a vibration generating part, and the first mounting member 11 is connected to the vehicle body as a vibration receiving part, thereby suppressing transmission of engine vibration to the vehicle body.

[0017] Hereinafter, the direction along the central axis O of the first mounting member 11 will be referred to as the axial direction. The side of the second mounting member 12 along the axial direction will be referred to as the upper side, and the side of the partition member 16 along the axial direction will be referred to as the lower side. In addition, in a plan view of the vibration damping device 1 from the axial direction, the direction intersecting the central axis O will be referred to as the radial direction, and the direction going around the central axis O will be referred to as the circumferential direction. The first mounting member 11, the second mounting member 12, and the elastic body 13 are each formed in a circular or annular shape when viewed from above, and are disposed coaxially with the central axis O.

[0018] The second mounting member 12 is formed in the shape of a column extending in the axial direction. The second mounting member 12 is provided radially inside the first mounting member 11. The second mounting member 12 is formed with a threaded hole 12b extending downward from its upper end surface, and a bolt (not shown) serving as a mounting fixture on the engine side is screwed into this threaded hole 12b.

[0019] The elastic body 13 is made of a rubber material and is connected to the inner circumferential surface of the first mounting member 11 and the outer circumferential surface of the second mounting member 12. The elastic body 13 may be made of, for example, a synthetic resin material. The elastic body 13 is formed in a cylindrical shape that extends downward from the inside to the outside in the radial direction. In the illustrated example, a fitting tube 11a is fitted into the first mounting member 11, and the elastic body 13 is vulcanization-bonded to the inner surface of the fitting tube 11a and the outer surface of the second mounting member 12, respectively.

[0020] A rubber film 11b is vulcanization-bonded over the entire inner peripheral surface of the first mounting member 11. Within the interior of the first mounting member 11, a portion located below the elastic body 13 forms a liquid chamber 19. Within the interior of the first mounting member 11, a portion located below the elastic body 13 is provided with a partition member 16 and a diaphragm 20, in this order from top to bottom.

[0021] The diaphragm 20 is made of an elastic material such as rubber or soft resin, and is formed into a cylindrical shape with a bottom. The diaphragm 20 is vulcanization bonded to the first mounting member 11. The diaphragm 20 is formed integrally with the rubber film 11b. The diaphragm 20 closes the lower end opening of the first mounting member 11. In the example shown, the bottom of the diaphragm 20 is deep on the outer periphery and shallow in the center. The shape of the diaphragm 20 may be changed as appropriate.

[0022] Within the first mounting member 11, a portion sandwiched in the axial direction between the diaphragm 20 and the elastic body 13 forms a liquid chamber 19. The liquid chamber 19 is an enclosed space that is liquid-tightly sealed by the elastic body 13 and the diaphragm 20. The liquid chamber 19 is sealed (filled) with liquid.

[0023] The liquid chamber 19 is divided in the axial direction by a partition member 16 into a main liquid chamber 14 having the elastic body 13 as part of the partition wall, and an auxiliary liquid chamber 15 having the diaphragm 20 as part of the partition wall. The main liquid chamber 14 is a space surrounded by the elastic body 13 and the partition member 16, and its internal volume changes with the deformation of the elastic body 13. The auxiliary liquid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16, and its internal volume changes with the deformation of the diaphragm 20. The vibration-damping device 1 having this configuration is a compression-type device that is installed and used so that the main liquid chamber 14 is located vertically above and the auxiliary liquid chamber 15 is located vertically below.

[0024] The partition member 16 is formed in a disk shape and is fitted into the first mounting member 11. An orifice passage 17 is formed in the partition member 16, connecting the primary liquid chamber 14 and the secondary liquid chamber 15. The orifice passage 17 extends in the circumferential direction. The partition member 16 is formed with a storage chamber 16a that houses a plate-shaped membrane 18 made of a rubber material. The storage chamber 16a is located in the radial center of the partition member 16. The partition member 16 is formed with a first communication hole 16b that connects the storage chamber 16a and the primary liquid chamber 14 to each other, and a second communication hole 16c that connects the storage chamber 16a and the secondary liquid chamber 15 to each other. The first communication hole 16b and the second communication hole 16c extend in the axial direction. A plurality of first communication holes 16b and a plurality of second communication holes 16c are provided.

[0025] In the vibration-damping device 1 configured as described above, when vibration is input, the first mounting member 11 and the second mounting member 12 are displaced relative to each other while elastically deforming the elastic body 13. As a result, the liquid in the liquid chamber 19 flows between the primary liquid chamber 14 and the secondary liquid chamber 15 through the orifice passage 17, and as the membrane 18 is deformed or displaced in the storage chamber 16a, the liquid in the liquid chamber 19 flows between the primary liquid chamber 14 and the secondary liquid chamber 15 through the storage chamber 16a, the first communication hole 16b, and the second communication hole 16c.

[0026] In this embodiment, a deformable shield 21 is provided that connects the inner surface of the first mounting member 11 and the outer surface of the second mounting member 12 and covers the elastic body 13 from above (the opposite side of the first liquid chamber along the axial direction).

[0027] The shield 21 is spaced upward from the outer peripheral surface of the elastic body 13. The shield 21 is vulcanization bonded to the inner peripheral surface of the fitting tube 11a and the outer peripheral surface of the second mounting member 12. The shield 21 is formed integrally with the elastic body 13 using the same material. The shield 21 is formed in the shape of an annular plate. The shield 21 is disposed coaxially with the central axis O. The shield 21 extends downward from the inside to the outside in the radial direction. The volume of the shield 21 is smaller than the volume of the elastic body 13. The thickness of the shield 21 is thinner than the thickness of the elastic body 13. The shield 21 may be made of a material other than rubber, and may be formed in a bellows shape, for example.

[0028] The shielding chamber 22, which is defined by being sandwiched in the axial direction between the shielding body 21 and the elastic body 13, is isolated from the liquid chamber 19. The shielding chamber 22 is an independent sealed space that is not in communication with the liquid chamber 19. The shielding chamber 22 is formed in an annular shape and is disposed coaxially with the central axis O. The internal volume of the shielding chamber 22 is smaller than the internal volumes of the main liquid chamber 14 and the auxiliary liquid chamber 15. The shielding chamber 22 contains the same liquid as that contained in the liquid chamber 19. The shielded chamber 22 may be filled with a liquid different from the liquid filled in the liquid chamber 19, or with a gas.

[0029] As described above, according to the vibration-damping device 1 of this embodiment, a deformable shielding body 21 is provided that connects the first mounting member 11 and the second mounting member 12 and covers the elastic body 13 from above, so that the shielding chamber 22 defined by being sandwiched axially between the shielding body 21 and the elastic body 13 makes it possible to prevent the elastic body 13 from coming into contact with the outside air, thereby suppressing oxidation of the elastic body 13. Since the shielding chamber 22 is isolated from the liquid chamber 19, the provision of the shielding chamber 22 can prevent changes in vibration isolation performance, and the shielding chamber 22 can be easily applied to existing vibration isolation devices, for example.

[0030] Since the internal volume of the shielding chamber 22 is smaller than the internal volumes of the main liquid chamber 14 and the auxiliary liquid chamber 15, the provision of the shielding chamber 22 can prevent the vibration-damping device 1 from becoming bulky in the axial direction.

[0031] Since the shielding body 21 is formed integrally with the elastic body 13 using the same material, the vibration-damping device 1 can be easily formed, and the shielding body 21 can be smoothly deformed in accordance with the relative displacement of the first mounting member 11 and the second mounting member 12.

[0032] Since the shielding chamber 22 is filled with the same liquid as that filled in the liquid chamber 19, the vibration isolation device 1 can be easily formed.

[0033] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0034] For example, in the above embodiment, a compression type vibration damping device 1 was described in which positive pressure acts on the main liquid chamber 14 when a support load is applied, but the present invention can also be applied to a hanging type vibration damping device that is installed so that the main liquid chamber 14 is located vertically below and the auxiliary liquid chamber 15 is located vertically above, and in which negative pressure acts on the main liquid chamber 14 when a support load is applied.

[0035] In addition, in the above embodiment, the partition member 16 divides the liquid chamber 19 in the first mounting member 11 into a main liquid chamber 14 having the elastic body 13 as part of the partition wall, and an auxiliary liquid chamber 15, but this is not limited to this. For example, an elastic body may be provided instead of providing the diaphragm 20, and a pressure-receiving liquid chamber having this elastic body as part of its partition wall may be provided instead of providing the auxiliary liquid chamber 15. For example, it is possible to appropriately change to another configuration in which the partition member 16 separates the liquid chamber 19 in the first mounting member 11 into the first liquid chamber 14 and the second liquid chamber 15, and at least one of the first liquid chamber 14 and the second liquid chamber 15 has the elastic body 13 as part of its partition wall.

[0036] Furthermore, the vibration isolation device 1 is not limited to being used as an engine mount for a vehicle, but can also be applied to devices other than engine mounts. For example, it can be applied to a mount for a generator mounted on construction machinery, or to a mount for machinery installed in a factory or the like.

[0037] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0038] For example, aspects of the present invention are as follows. <1> a cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, and a cylindrical second mounting member connected to the other of the vibration generating unit and the vibration receiving unit; an elastic body connecting the first mounting member and the second mounting member; a partition member that divides a liquid chamber in the first mounting member into a first liquid chamber having the elastic body as a part of a partition wall and a second liquid chamber along an axial direction along a central axis of the first mounting member, and that has an orifice passage formed therein that connects the first liquid chamber and the second liquid chamber, a deformable shielding body is provided that connects the first mounting member and the second mounting member and covers the elastic body from the opposite side of the first fluid chamber along the axial direction, A shielding chamber defined by being sandwiched between the shielding body and the elastic body in the axial direction is isolated from the liquid chamber. <2> the internal volume of the shielding chamber is smaller than the internal volumes of the first liquid chamber and the second liquid chamber; <1> The vibration isolation device according to claim 1. <3> The shielding body is formed integrally with the elastic body using the same material. <1> or <2> The vibration isolation device according to claim 1. <4> The shielding chamber is filled with the same liquid as that filled in the liquid chamber. <1> from <3> The vibration-damping device according to any one of the preceding items. [Explanation of symbols]

[0039] 1. Vibration isolation device 11 First mounting member 12 Second mounting member 13 Elastic Body 14 Main liquid chamber (1st liquid chamber) 15 Secondary liquid chamber (second liquid chamber) 16 Partition member 17 Orifice passage 19 Liquid chamber 21 Shield 22 Shielded room O center axis

Claims

1. a cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, and a cylindrical second mounting member connected to the other of the vibration generating unit and the vibration receiving unit; an elastic body connecting the first mounting member and the second mounting member; a partition member that divides a liquid chamber in the first mounting member into a first liquid chamber having the elastic body as a part of a partition wall and a second liquid chamber along an axial direction along a central axis of the first mounting member, and that has an orifice passage formed therein that connects the first liquid chamber and the second liquid chamber, a deformable shielding body is provided that connects the first mounting member and the second mounting member and covers the elastic body from the opposite side of the first fluid chamber along the axial direction, a shield chamber defined by being sandwiched between the shield body and the elastic body in the axial direction is isolated from the liquid chamber, an internal volume of the shielding chamber is smaller than an internal volume of each of the first liquid chamber and the second liquid chamber; the shielding body is integrally formed with the elastic body using the same material, A vibration-isolating device, wherein the shielding body has a thickness thinner than that of the elastic body.

2. 2. The vibration isolation device according to claim 1, wherein the shielding chamber is filled with the same liquid as that filled in the liquid chamber.

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