JP2016148425A - Liquid sealed vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid sealed vibration control device which damps vibration in multiple frequency bands with one device.SOLUTION: A liquid sealed vibration control device 10 has: an outer cylinder member 11; an inner cylinder member 13; and a vibration control part 12 disposed between the outer cylinder member 11 and the inner cylinder member 13 and including a liquid chamber, in which a liquid is enclosed, formed therein. A first liquid chamber group 50 and a second liquid chamber group 60, which are respectively formed by pairs of liquid chambers communicating with each other through communication passages and are divided from each other by a first partition wall 70 and a second partition wall 71 formed by elastic bodies, are provided in the vibration control part 12 so as to be arranged in a circumferential direction of the vibration control part 12. A passage cross sectional area of a first communication passage 51 of the first liquid chamber group 50 is different from a passage cross sectional area of a second communication passage 61 of the second liquid chamber group 60. A passage length of the first communication passage 51 is different from a passage length of the second communication passage 61.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a liquid filled vibration damping device having a liquid chamber filled with a liquid.

  Conventionally, for example, a device described in Patent Document 1 is known as a liquid-filled vibration damping device. The liquid-filled vibration damping device described in the document includes an outer cylinder member, an inner cylinder member, a vibration damping portion interposed between the outer cylinder member and the inner cylinder member, and a liquid formed inside the vibration damping portion. It has a room. The liquid chamber is divided into a main liquid chamber and a sub liquid chamber, and the main liquid chamber and the sub liquid chamber communicate with each other through a communication path. In such a vibration damping device, a vibration damping effect against vibrations input from the outside can be obtained by the vibration damping action caused by the flow of the liquid between the main liquid chamber and the sub liquid chamber through the communication path.

Japanese Patent Laid-Open No. 2004-21807

  By the way, if the flow path cross-sectional area or flow path length of the communication path is changed, the frequency band of the vibration to be attenuated is changed. For example, as the flow path cross-sectional area is reduced, the frequency band of vibration to be damped changes to the low frequency side. Further, the longer the flow path length is, the more the frequency band of vibration to be damped changes to the lower frequency side.

  Therefore, when there are a plurality of frequency bands for vibration transmitted from the vibration-damped member to be controlled by the liquid-filled vibration damping device to the liquid-filled vibration damping device, the flow path of the communication path is cut for each frequency band of vibration. It is conceivable to prepare a plurality of liquid-filled vibration damping devices with optimized areas and flow path lengths and use them side by side.

  However, if a plurality of liquid-filled vibration control devices are used to suppress vibrations in a plurality of frequency bands, the assembly of each vibration control device becomes complicated, or the vibration control device corresponds to the number of disposed liquid-filled vibration control devices. The overall size will increase.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a liquid-filled vibration damping device that can attenuate vibrations in a plurality of frequency bands with a single device.

  A liquid-filled vibration damping device that solves the above problems includes an outer cylinder member, an inner cylinder member, a cylinder that is disposed between the outer cylinder member and the inner cylinder member, and in which a liquid chamber that encloses liquid is provided. And a vibration control unit in the form of a ring. A plurality of liquid chamber groups, which are configured by a pair of liquid chambers communicated with each other by a communication path and are partitioned by elastic partition walls, are arranged in the vibration damping portion side by side in the circumferential direction of the vibration damping portion. ing. And it is comprised so that at least one of the flow-path cross-sectional area and flow-path length of a communicating path may differ for every liquid chamber group.

  In the liquid-filled vibration damping device having the same configuration, the flow of the liquid through the communication path occurs between the pair of liquid chambers constituting the liquid chamber group, so that the frequency according to the channel cross-sectional area and the channel length of the communication path Band vibration is attenuated. Here, in the same configuration, since a plurality of liquid chamber groups having at least one of the channel cross-sectional area and the channel length of the communication path are provided, vibrations in a plurality of frequency bands are generated by one liquid-filled vibration damping device. It becomes possible to attenuate.

  Further, in this configuration, since the plurality of liquid chamber groups are provided side by side in the circumferential direction of the vibration control unit, it is possible to configure a liquid-filled vibration damping device including a plurality of liquid chamber groups in a compact manner.

The perspective view of one Embodiment of a liquid enclosure damping device. FIG. 2 is a cross-sectional view of the liquid-filled vibration damping device along line 2-2 shown in FIG. 1. The figure which shows typically an example of the suspension aspect of the exhaust pipe to the vehicle body floor using the liquid filling vibration damping device of the embodiment. The top view which looked at the liquid filling vibration damping device of the embodiment and its peripheral part from the front side. Sectional drawing which looked at the liquid filling vibration damping device of the same embodiment, and its peripheral part from the side surface side. The graph which shows the attenuation | damping characteristic of the liquid filling vibration damping device of the embodiment.

  Hereinafter, an embodiment of a liquid-filled vibration damping device will be described in detail with reference to FIGS. Note that the liquid-filled vibration damping device of the present embodiment is interposed between the vehicle body floor and the exhaust pipe suspended from the vehicle body floor.

  As shown in FIG. 1, the liquid-filled vibration damping device 10 has a metal outer cylinder member 11 formed in a circular tube shape. A cylindrical damping portion 12 made of an elastic body such as rubber is bonded to the inner periphery of the outer cylinder member 11. A liquid chamber in which an incompressible liquid is sealed is provided inside the vibration damping unit 12. In addition, a metal inner cylinder member 13 formed in a circular tube shape is bonded to the central portion of the vibration damping portion 12 in the diameter direction.

FIG. 2 shows a cross-sectional structure of the liquid-filled vibration damping device 10 in a direction perpendicular to the central axis L (shown in FIG. 1) of the liquid-filled vibration damping device 10.
As shown in FIG. 2, a cylindrical inner cylinder support portion 14 that is integrally formed with the vibration damping portion 12 and to which an inner cylinder member 13 is bonded is provided inside the vibration damping portion 12. A first partition wall 70 and a second partition wall 71 that are in contact with the inner periphery surface 11 </ b> A of the outer cylinder member 11 are provided on the outer periphery surface of the inner cylinder support portion 14.

The first partition wall 70 and the second partition wall 71 are elastic bodies integrally formed with the inner cylinder support portion 14, and extend from the outer peripheral surface of the inner cylinder support portion 14 in the diameter direction of the outer cylinder member 11.
By the first partition wall 70 and the second partition wall 71, two liquid chambers 50 and 60 that are independently partitioned are formed inside the damping unit 12. In the following, these two liquid chambers 50 and 60 that are independently partitioned will be referred to as a first liquid chamber group 50 and a second liquid chamber group 60, respectively. As shown in FIG. 1, the first liquid chamber group 50 and the second liquid chamber group 60 are provided side by side in the circumferential direction of the damping unit 12.

  A first arm portion 15 and a second arm portion 17 extending toward the inner peripheral surface 11 </ b> A of the outer cylinder member 11 are provided on the outer peripheral surface of the inner cylinder support portion 14. The first arm portion 15 and the second arm portion 17 are integrally formed with the inner cylinder support portion 14, and are in the diameter direction of the outer cylinder member 11 from the outer peripheral surface of the inner cylinder support portion 14, and the first partition wall 70 and the second arm portion 17. Each extends in a direction orthogonal to the extending direction of the partition walls 71.

  By the first arm portion 15, the first liquid chamber group 50 is divided into a pair of liquid chambers, more specifically, a first main liquid chamber 50A and a first sub liquid chamber 50B. The second arm 17 also divides the second liquid chamber group 60 into a pair of liquid chambers, more specifically, a second main liquid chamber 60A and a second sub liquid chamber 60B.

  The end portion 16 of the first arm portion 15 has a fan shape extending in the circumferential direction of the inner cylinder support portion 14, and the first main portion 15 is between the end portion 16 and the inner peripheral surface 11 </ b> A of the outer cylinder member 11. A first communication path 51 is formed to communicate between the liquid chamber 50A and the first sub liquid chamber 50B.

  Further, the end portion 18 of the second arm portion 17 also has a fan shape extending in the circumferential direction of the inner cylinder support portion 14, and between the end portion 18 and the inner peripheral surface 11 </ b> A of the outer cylinder member 11, A second communication passage 61 is formed for communicating the two main liquid chambers 60A and the second sub liquid chamber 60B.

  The flow passage cross-sectional area of the first communication passage 51 is smaller than the flow passage cross-sectional area of the second communication passage 61. Further, the flow path length of the first communication path 51 is longer than the flow path length of the second communication path 61.

FIG. 3 shows an example of a manner of suspending the exhaust pipe to the vehicle body floor using such a liquid-filled vibration damping device 10.
As shown in FIG. 3, the exhaust pipe 21 provided so as to extend from the engine 19 to the rear of the vehicle body is provided with a catalyst 24 at a part on the engine 19 side and a muffler 25 at a part near the pipe end. ing. The vehicle body floor 20 is provided with a plurality of such suspension positions 22 and 23 of the exhaust pipe 21 (two in the example of FIG. 3). Incidentally, in the example of FIG. 3, the suspension position 22 is provided at the installation position of the catalyst 24 in the exhaust pipe 21, and the suspension position 23 is provided at the installation position of the muffler 25 in the exhaust pipe 21. The liquid-filled vibration damping device 10 of the present embodiment is installed at the suspension position 23 closest to the exhaust pipe rear end among the suspension positions 22 and 23.

4 and 5 show an example of a connection mode of the liquid filled vibration damping device 10 to the vehicle body floor 20 and the exhaust pipe 21. FIG.
As shown in these drawings, the liquid filled vibration damping device 10 is connected to the vehicle body floor 20 via a floor mounting member 26. The floor mounting member 26 includes a metal circular pipe portion 27 formed in a circular tube shape, and two fixing portions 28 made of a metal plate material bent in an L shape and fixed to both sides thereof. Yes. Then, the circular tube part 27 is fitted on the outer periphery of the outer cylinder member 11, and the fixing part 28 is fixed to the vehicle body floor 20 by welding, bolts, screws, or the like, so that the liquid-filled vibration damping device 10 can be 20 is connected.

  Further, the connection of the liquid filled vibration damping device 10 to the exhaust pipe 21 is performed via the exhaust pipe attachment member 29. The exhaust pipe attachment member 29 fixed to the muffler 25 of the exhaust pipe 21 is provided with a round rod-like attachment shaft 30 extending in the extending direction of the exhaust pipe 21. The liquid-filled vibration damping device 10 is connected to the exhaust pipe 21 by inserting the attachment shaft 30 into the inner periphery of the inner cylinder member 13. The attachment shaft 30 is inserted so as to be slidable in the axial direction with respect to the inner cylinder member 13. Therefore, the displacement of the exhaust pipe attachment member 29 due to the thermal expansion of the exhaust pipe 21 can be absorbed by the sliding of the attachment shaft 30 with respect to the inner cylinder member 13.

Next, the operation of the liquid filled vibration damping device 10 will be described.
FIG. 6 shows the attenuation characteristics of the liquid filled vibration damping device 10. Note that the curve indicated by the alternate long and short dash line L1 in FIG. 6 shows the attenuation characteristics of the liquid-filled vibration damping device that includes only the first liquid chamber group 50 having the first communication path 51 in the vibration damping portion 12. A curve indicated by a two-dot chain line L <b> 2 in FIG. 6 indicates the attenuation characteristic of the liquid-filled vibration damping device including only the second liquid chamber group 60 having the second communication path 61 in the vibration damping unit 12. And the curve shown with the continuous line L3 in FIG. 6 shows the attenuation | damping characteristic of the liquid enclosure damping device 10 of this embodiment provided with the said 1st liquid chamber group 50 and the said 2nd liquid chamber group 60. As shown in FIG.

  As described above, the flow path cross-sectional area of the first communication path 51 is smaller than the flow path cross-sectional area of the second communication path 61. Further, the flow path length of the first communication path 51 is longer than the flow path length of the second communication path 61. Here, as the flow path cross-sectional area of the communication passage communicating with the two liquid chambers is reduced, the frequency band of the vibration to be damped is changed to the lower frequency side. Further, as the length of the communication path communicating with the two liquid chambers is increased, the frequency band of the vibration to be damped is changed to the lower frequency side.

  Therefore, as shown in FIG. 6, the frequency band of vibration damped by the first liquid chamber group 50 (the frequency band of the curve indicated by the alternate long and short dash line L1) is the frequency of vibration damped by the second liquid chamber group 60. It is a band on the lower frequency side than the band (frequency band of the curve indicated by the two-dot chain line L2).

  The liquid-filled vibration damping device 10 of this embodiment includes both the first liquid chamber group 50 and the second liquid chamber group 60 that can attenuate vibrations in different frequency bands. Therefore, as indicated by a solid line L3 in FIG. 6, in the liquid filled vibration damping device 10, the frequency band of vibration that can be damped by the first liquid chamber group 50 and the frequency of vibration that can be damped by the second liquid chamber group 60. Vibrations in a plurality of frequency bands such as bands are attenuated.

  Further, the first liquid chamber group 50 and the second liquid chamber group 60 are provided side by side in the circumferential direction of the vibration control unit 12. Therefore, for example, compared with the case where the first liquid chamber group 50 and the second liquid chamber group 60 are provided side by side in the direction of the central axis L, the liquid filled vibration damping device 10 including the two liquid chamber groups 50 and 60 is compact. It is also possible to configure.

According to the liquid filled vibration damping device 10 of the present embodiment described above, the following effects can be obtained.
(1) Since the first liquid chamber group 50 and the second liquid chamber group 60 having different channel cross-sectional areas and channel lengths for communicating with a pair of liquid chambers are provided, one liquid-filled vibration damping The apparatus 10 can attenuate vibrations in a plurality of frequency bands.

  (2) Since the first liquid chamber group 50 and the second liquid chamber group 60 are arranged side by side in the circumferential direction of the vibration damping unit 12, the liquid-filled vibration damping device 10 including the two liquid chamber groups 50 and 60 is provided. Can be configured compactly.

In addition, the said embodiment can also be changed and implemented as follows.
In order to make the attenuation characteristics of the first liquid chamber group 50 different from the attenuation characteristics of the second liquid chamber group 60, the flow path cross-sectional areas and flow path lengths of the first communication path 51 and the second communication path 61 are different from each other. I tried to make it. In addition, in order to make the attenuation characteristics of the first liquid chamber group 50 different from the attenuation characteristics of the second liquid chamber group 60, only the cross-sectional areas of the first communication path 51 and the second communication path 61 are changed, Only the flow path lengths of the first communication path 51 and the second communication path 61 may be different.

-Although two liquid chamber groups were provided in the inside of the damping part 12, you may provide three or more liquid chamber groups.
Although the outer cylinder member 11 and the inner cylinder member 13 are made of metal, they may be formed of other materials.

-Although the outer cylinder member 11, the inner cylinder member 13, and the vibration suppression part 12 were circular shape, other cylindrical shapes, for example, square shape, may be sufficient.
Each of the inner cylinder support part 14, the first arm part 15, the second arm part 17, the end part 16 of the first arm part 15, the end part 18 of the second arm part 17, the first partition wall 70, and the second partition wall 71. The shape may be changed as appropriate.

  Although the liquid filled vibration damping device 10 is connected to the vehicle body floor 20 and the exhaust pipe 21 via the floor mounting member 26 and the exhaust pipe mounting member 29, the liquid filled vibration damping device 10 may be connected in other modes. .

The number of suspension positions of the exhaust pipe 21 provided on the vehicle body floor 20 may be arbitrarily changed. Further, the liquid-filled vibration damping device 10 may be provided at each of a plurality of suspension positions.
-Although the liquid enclosure damping device 10 of the said embodiment was used in the suspension position of the exhaust pipe 21 with respect to the vehicle body floor 20, the liquid enclosure device of the same structure is employable also for other uses.

 DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure damping device, 11 ... Outer cylinder member, 12 ... Damping part, 13 ... Inner cylinder member, 19 ... Engine, 20 ... Vehicle body floor, 21 ... Exhaust pipe, 22, 23 ... Suspension position, 24 ... Catalyst 25 ... Muffler, 26 ... Floor mounting member, 27 ... Circular pipe part, 28 ... Fixed part, 29 ... Exhaust pipe mounting member, 30 ... Mounting shaft, 50 ... First liquid chamber group, 50A ... First main liquid chamber, 50B ... first sub-liquid chamber, 51 ... first communication passage, 60 ... second liquid chamber group, 60A ... second main liquid chamber, 60B ... second sub-liquid chamber, 61 ... second communication passage.

Claims (1)

A liquid having an outer cylinder member, an inner cylinder member, and a cylindrical vibration damping portion disposed between the outer cylinder member and the inner cylinder member and provided with a liquid chamber in which liquid is enclosed. In the enclosed damping device,
A plurality of liquid chamber groups each composed of a pair of liquid chambers that are communicated with each other by a communication passage are arranged in the circumferential direction of the damping unit. A liquid-filled vibration damping device is provided, wherein at least one of a channel cross-sectional area and a channel length of the communication path is different for each liquid chamber group.