JP6018003B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that is applied to, for example, an automobile and absorbs and absorbs vibrations of a vibration generating unit such as an engine.

Conventionally, for example, as shown in Patent Document 1 below, a partition member is connected to a main liquid chamber and a sub liquid chamber, and a shake orifice that causes liquid column resonance in response to an input of shake vibration, and a valve member have been provided. The storage chamber accommodated in a freely displaceable or deformable manner, the communication hole that connects the storage chamber and the main liquid chamber, and the storage chamber and the sub liquid chamber communicate with each other to generate liquid column resonance with respect to the input of idle vibration. A configuration in which an idle orifice is formed is known.
In this vibration isolator, when the shake vibration is input, the valve member closes the opening of the idle orifice toward the accommodation chamber, and when the idle vibration is input, the opening of the idle orifice toward the accommodation chamber is closed. Opened.

JP 2009-243510 A

  However, in the conventional vibration isolator, for example, when the shake vibration is input, the idle orifice communicates with the storage chamber, or when the idle vibration having a relatively large amplitude is input, the communication between the idle orifice and the storage chamber is blocked. Therefore, there is room for improvement in accurately switching the communication between the idle orifice and the storage chamber and the blocking thereof with the valve member.

  The present invention has been made in consideration of such a situation, and the communication between the idle orifice and the storage chamber and the blocking thereof are made simple in the structure and less influenced by the amplitude of the input vibration. An object of the present invention is to provide a vibration isolator that can be switched with high accuracy according to the frequency of vibration.

  In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention includes a cylindrical first attachment member coupled to one of a vibration generating unit and a vibration receiving unit, And a second mounting member connected to the other, an elastic body connecting the two mounting members to each other, a liquid chamber in the first mounting member in which liquid is sealed, and the elastic body as a part of the wall surface. A main liquid chamber and a partition member that partitions into the sub liquid chamber, and the partition member communicates with the main liquid chamber and the sub liquid chamber and causes resonance with respect to an input of shake vibration. A main shake orifice, a storage chamber in which a valve member is stored in a freely displaceable or deformable manner, a sub-shake orifice that communicates the storage chamber and the main liquid chamber, and causes resonance with respect to an input of shake vibration; The storage chamber communicates with the main liquid chamber, and the front A communication hole having a flow resistance smaller than that of the sub-shake orifice, and an idle orifice that communicates with the storage chamber and the sub-liquid chamber and causes resonance with respect to an input of idle vibration are formed. The communication between the idle orifice and the storage chamber and the blocking thereof are switched in accordance with the displacement or deformation in the storage chamber due to the fluid pressure fluctuation in the main liquid chamber.

According to the present invention, since the secondary shake orifice that communicates with the main liquid chamber is opened in the storage chamber in which the valve member is stored, when the shake vibration is input to the vibration isolator, the secondary shake orifice is By causing resonance, the valve member of the storage chamber is pushed toward the sub liquid chamber side, and the opening of the idle orifice toward the storage chamber is closed. Thereby, the communication between the idle orifice and the storage chamber is cut off, the liquid in the liquid chamber flows through the main shake orifice and causes resonance, and the input shake vibration is attenuated and absorbed.
Further, when idle vibration is input to the vibration isolator, clogging occurs in the sub-shake orifice, and the force of pressing the valve member toward the sub-liquid chamber is reduced, so that the liquid that has entered the storage chamber The valve member flows on the outer peripheral side and becomes easy to sink downward, and the valve member can be easily floated. As a result, the opening of the idle orifice toward the accommodation chamber is opened, and the liquid in the liquid chamber flows through the idle orifice to cause resonance, so that the input idle vibration is attenuated and absorbed.
Here, for example, even if the amplitude of the input idle vibration is relatively large, the sub-shake orifice is clogged, so that the valve member is less likely to be pushed toward the sub-liquid chamber side. The opening of the idle orifice toward the accommodation chamber is opened, and this idle vibration can be damped and absorbed.
From the above, for example, without providing a piston member slidably in the cylinder chamber, the communication between the idle orifice and the storage chamber and the blocking thereof are made less susceptible to the influence of the input vibration, with a simple configuration. Thus, it is possible to switch accurately according to the frequency.

  Here, the sub-shake orifice opens toward an inner portion located on the inner side of the outer peripheral portion of the surface of the valve member, and the communication hole opens toward the outer peripheral portion of the surface of the valve member. Also good.

In this case, since the sub-shake orifice opens toward the inner part of the surface of the valve member, it becomes possible to stably push the valve member toward the sub-liquid chamber when inputting shake vibration. The opening of the idle orifice toward the accommodation chamber can be reliably closed.
In addition, since the communication hole is opened toward the outer peripheral portion on the surface of the valve member, the liquid that has entered the storage chamber through the communication hole can easily enter under the valve member when the idle vibration is input. The member can be reliably suspended.

  According to the present invention, the communication between the idle orifice and the storage chamber and the blocking thereof can be switched with high accuracy according to the frequency of the input vibration with a simple configuration and less affected by the amplitude of the input vibration. it can.

In one Embodiment which concerns on this invention, it is a longitudinal cross-sectional view of a vibration isolator. It is the perspective view which looked at the partition member shown in FIG. 1 from the subliquid chamber side. It is the perspective view which looked at the partition member shown in FIG.1 and FIG.2 from the main liquid chamber side.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the vibration isolator 1 includes a cylindrical first mounting member 11 connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member connected to the other. 12, an elastic body 13 that couples the two attachment members 11, 12 to each other, a liquid chamber in the first attachment member 11 in which a liquid is sealed, and a main liquid chamber having the elastic body 13 as a part of the wall surface. 14, and a partition member 16 that partitions the sub liquid chamber 15.
In the illustrated example, the second mounting member 12 is formed in a column shape, the elastic body 13 is formed in a cylindrical shape, and the first mounting member 11, the second mounting member 12, and the elastic body 13 are coaxial with the common axis. It is arranged. Hereinafter, the common axis is referred to as an axis O, the main liquid chamber 14 side along the axis O direction is referred to as one side, the sub liquid chamber 15 side is referred to as the other side, and the direction orthogonal to the axis O is referred to as the radial direction. A direction around the axis O is referred to as a circumferential direction.

When the vibration isolator 1 is mounted on an automobile, for example, the second mounting member 12 is connected to an engine as a vibration generating unit, while the first mounting member 11 receives vibrations via a bracket (not shown). By being connected to the vehicle body as a part, vibration of the engine is prevented from being transmitted to the vehicle body.
For example, ethylene glycol, water, silicone oil, or the like is sealed in the liquid chamber of the first mounting member 11.

The first mounting member 11 includes a one-side outer cylinder 21 located on one side and an other-side outer cylinder 22 located on the other side along the axis O direction.
The elastic body 13 is connected in a liquid-tight state to one end of the one-side outer cylinder 21, and the opening on one side of the one-side outer cylinder 21 is closed by the elastic body 13. Of the one-side outer cylinder 21, the other-side end portion 21a is formed to have a larger diameter than other portions. The inside of the one side outer cylinder 21 is a main liquid chamber 14. In the one-side outer cylinder 21, an annular groove 21b that extends continuously over the entire circumference is formed in a portion that is continuous from the other side with respect to the portion to which the elastic body 13 is connected.

  The diaphragm 17 is connected in a liquid-tight state to the other end of the other outer cylinder 22, and the other opening of the other outer cylinder 22 is closed by the diaphragm 17. Of the other-side outer cylinder 22, one end 22 a has a larger diameter than the other part. One end 22 a of the other outer cylinder 22 is fitted into the other end 21 a of the one outer cylinder 21. In addition, the partition member 16 is fitted in the other side outer cylindrical body 22. A portion located between the partition member 16 and the diaphragm 17 in the inside of the other outer cylinder 22 is a sub liquid chamber 15. The other outer cylinder 22 is covered over the entire area by a rubber film formed integrally with the diaphragm 17.

  An internal thread portion 12 a is formed coaxially with the axis O on the one end face of the second mounting member 12. The second mounting member 12 protrudes from the first mounting member 11 to one side. The second mounting member 12 is formed with a flange portion 12b that protrudes radially outward and continuously extends over the entire circumference. The flange portion 12 b is separated from one end of the first mounting member 11 to one side.

  The elastic body 13 is formed of, for example, a rubber material that can be elastically deformed, and is formed in a cylindrical shape that gradually increases in diameter from one side to the other side. One end of the elastic body 13 is connected to the second mounting member 12, and the other end is connected to the first mounting member 11. The inner peripheral surface of the one outer cylinder 21 of the first mounting member 11 is covered over the entire area by a rubber film formed integrally with the elastic body 13.

  In the partition member 16, the main liquid chamber 14 and the sub liquid chamber 15 communicate with each other, and a main shake orifice 31 and a valve member 32 that cause liquid column resonance in response to an input of shake vibration are accommodated in a displaceable or deformable manner. The storage chamber 33, the storage chamber 33, and the main liquid chamber 14 communicate with each other, and the sub-shake orifice 34 that causes liquid column resonance with respect to the input of shake vibration, the storage chamber 33, and the main liquid chamber 14 communicate with each other. In addition, a communication hole 27 having a flow resistance smaller than that of the sub-shake orifice 34 and an idle orifice 35 that allows the storage chamber 33 and the sub-liquid chamber 15 to communicate with each other and cause liquid column resonance in response to input of idle vibration are formed. Has been.

This will be specifically described below.
The partition member 16 includes a shake orifice member 25 fitted in the first mounting member 11 and an idle orifice member 26 disposed in the shake orifice member 25. The shake orifice member 25 is formed in a cylindrical shape with an idle orifice member 26 fitted therein.
The shake orifice member 25 is formed with a main shake orifice 31, a sub-shake orifice 34 and a communication hole 27, and the idle orifice member 26 is formed with an idle orifice 35, and the shake orifice member 25 and the idle orifice member 26 are A storage chamber 33 is formed therebetween.

  A recess is formed on the surface of one side of the idle orifice member 26, and the recess is closed from one side by the back surface of the other side of the top wall of the shake orifice member 25, so that the storage chamber 33 is defined. And in this storage chamber 33, the plate-shaped valve member 32 formed in circular shape in planar view is accommodated. In the illustrated example, the valve member 32 is smaller in both the size in the axis O direction and the size in the radial direction than the accommodating chamber 33. As for the gap between the valve member 32 and the wall surface of the storage chamber 33, the gap in the direction of the axis O is smaller than the gap in the radial direction. The valve member 32 is an elastic body.

A recess is formed on the back surface of the other side of the idle orifice member 26, and this recess serves as an idle orifice 35. The idle orifice 35 is formed in a circular shape in plan view. The idle orifice member 26 is formed with a first opening 29 that communicates the idle orifice 35 and the storage chamber 33. The inner diameter of the idle orifice 35 is the same as the inner diameter of the storage chamber 33, and the idle orifice 35 and the storage chamber 33 are each positioned coaxially with a common axis that is radially away from the axis O. In the illustrated example, the inner diameter of the storage chamber 33 is slightly larger than the inner diameter of the idle orifice 35.
The valve member 32 opens and closes the first opening 29 in accordance with the displacement or deformation in the storage chamber 33 caused by the fluid pressure fluctuation in the main liquid chamber 14, thereby the idle orifice 35 and the storage chamber 33. Switch between communication with and disconnection.
As shown in FIG. 2, a hollow hole 26 a having a C shape in plan view is formed on the back surface of the idle orifice member 26 so as to surround the idle orifice 35.

  The main shake orifice 31 is a circumferential groove formed on the outer peripheral surface of the shake orifice member 25, and a second opening 31 a that opens toward the inside of the main liquid chamber 14 and the auxiliary liquid chamber 15 at both peripheral ends thereof. A third opening 31b that opens inward is connected to each other. The 2nd opening part 31a and the 3rd opening part 31b are opened in the axis line O direction, as FIG.2 and FIG.3 shows. As shown in FIG. 1, the main shake orifice 31 is closed from the outside in the radial direction by the inner peripheral surface of the other outer cylindrical body 22 of the first mounting member 11.

In the top wall of the shake orifice member 25, an inner portion 25a located radially inside from the outer peripheral portion is recessed toward the other side. As shown in FIG. 3, a second opening 31 a is formed on the outer peripheral portion of the top wall of the shake orifice member 25. A cylindrical body 28 is erected on one side of the inner portion 25 a of the top wall of the shake orifice member 25, and the inner side thereof is a sub-shake orifice 34 that communicates with the storage chamber 33.
The flow resistance of the secondary shake orifice 34 is equal to or less than the flow resistance of the main shake orifice 31 and larger than the flow resistance of the idle orifice 35. The liquid column resonance frequency of each of the sub-shake orifice 34 and the main shake orifice 31 is tuned to a shake vibration frequency (for example, 14 Hz or less). The liquid column resonance frequency of the idle orifice 35 is tuned to an idle vibration frequency (for example, about 18 Hz to 30 Hz).

  The communication hole 27 is formed in a connection portion between the inner portion 25 a of the shake orifice member 25 and the cylindrical body 28. The communication hole 27 is a long hole extending along the outer peripheral surface of the cylinder 28, and a plurality of communication holes 27 are formed around the cylinder 28 at intervals. Further, the communication hole 27 has a flow path length along the axis O direction shorter than that of the auxiliary shake orifice 34. The communication hole 27 and the first opening 29 are formed in the same shape and size. Further, the communication hole 27 and the first opening 29 are arranged at the same position in the direction along the surface of the valve member 32, and face each other in the axis O direction with the valve member 32 interposed therebetween.

In the illustrated example, the sub-shake orifice 34, the communication hole 27, and the first opening 29 face the surface of the valve member 32 in the direction of the axis O. Further, the sub-shake orifice 34 opens toward an inner portion located on the inner side of the outer peripheral portion of the surface of the valve member 32, and the first opening portion 29 and the communication hole 27 are the outer peripheral portion on the surface of the valve member 32. It is open toward. For example, the sub-shake orifice 34 opens toward the portion of the surface of the valve member 32 that includes the position of the center of gravity of the valve member 32, and the first opening 29 and the communication hole 27 include the surface of the valve member 32, The valve member 32 is opened toward the portion away from the center of gravity.
The main shake orifice 31, the sub-shake orifice 34, and the idle orifice 35 are independent flow paths, and the liquid flowing through the main shake orifice 31 does not pass through the storage chamber 33, but the main liquid. It moves between the chamber 14 and the auxiliary liquid chamber 15.

  As described above, according to the vibration isolator 1 according to the present embodiment, the auxiliary shake orifice 34 communicating with the main liquid chamber 14 is opened in the storage chamber 33 in which the valve member 32 is stored. When shake vibration is input to the vibration device 1, liquid column resonance is generated at the sub-shake orifice 34, whereby the valve member 32 of the storage chamber 33 is pushed toward the other side, and the first opening 29 is opened. It will be blocked. Thereby, the communication between the idle orifice 35 and the storage chamber 33 is cut off, and the liquid in the liquid chamber flows through the main shake orifice 31 to cause liquid column resonance, and the input shake vibration is attenuated and absorbed.

Further, when idle vibration is input to the vibration isolator 1, clogging occurs in the sub-shake orifice 34, and the pressing force toward the other side with respect to the valve member 32 is reduced, so that it enters the storage chamber 33. Thus, the liquid flows on the valve member 32 toward the outer peripheral side and easily enters the lower side, and the valve member 32 can be easily floated. As a result, the first opening 29 is opened, and the liquid in the liquid chamber flows through the idle orifice 35 to cause liquid column resonance, and the input idle vibration is attenuated and absorbed.
Here, for example, even if the amplitude of the input idle vibration is relatively large, the sub-shake orifice 34 is clogged, so that the valve member 32 is less likely to be pushed toward the other side. The first opening 29 is opened, and this idle vibration can be absorbed and absorbed.

  From the above, for example, without providing a piston member slidably in the cylinder chamber, the communication between the idle orifice 35 and the storage chamber 33 and the blocking thereof are affected by the amplitude of the input vibration with a simple configuration. It can be made difficult and can be switched accurately according to the frequency.

Furthermore, since the sub-shake orifice 34 opens toward the inner part of the surface of the valve member 32, the valve member 32 can be stably pushed toward the other side when the shake vibration is input, The first opening 29 can be reliably closed.
Further, since the communication hole 27 opens toward the outer peripheral portion on the surface of the valve member 32, the liquid that has entered the storage chamber 33 through the communication hole 27 is input to the lower side of the valve member 32 when the idle vibration is input. It becomes easy to sink, and the valve member 32 can be reliably floated.

  Further, in the present embodiment, the communication hole 27 and the first opening 29 are opposed to each other in the direction of the axis O across the valve member 32, so that the liquid in the liquid chamber is allowed to flow when the idle vibration is input. It is possible to circulate between the communication hole 27 and the first opening 29 without any delay, and the valve member 32 can be floated more reliably.

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

For example, in the above-described embodiment, the case where the engine is connected to the second mounting member 12 and the first mounting member 11 is connected to the vehicle body has been described. However, the engine may be configured to be connected in reverse. A vibration isolator may be installed in the vibration generating unit and the vibration receiving unit other than the above.
In addition, the recessed portion may not be formed in the inner portion 25 a of the shake orifice member 25, and the lightening hole 26 a may not be formed in the back surface of the idle orifice member 26.
Moreover, in embodiment mentioned above, the subshake orifice 34 opens toward the inner side part located inside an outer peripheral part among the surfaces of the valve member 32, and the 1st opening part 29 and the communicating hole 27 are valve members. Although the structure opened toward the outer peripheral part on the surface of 32 was shown, it is not restricted to this, For example, the subshake orifice 34 is opened toward the outer peripheral part of the surface of the valve member 32, and the 1st opening part 29 and communication are connected. The hole 27 may be opened toward the inner part of the surface of the valve member 32.
Further, in the above-described embodiment, the communication hole 27 and the first opening 29 are formed in the same shape and size and are opposed to each other in the axis O direction with the valve member 32 interposed therebetween. The shape may be different from each other, or may be appropriately changed such that the positions along the surface of the valve member 32 are different from each other.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 11 1st attachment member 12 2nd attachment member 13 Elastic body 14 Main liquid chamber 15 Sub liquid chamber 16 Partition member 27 Communication hole 31 Main shake orifice 32 Valve member 33 Accommodating chamber 34 Sub shake orifice 35 Idle orifice

Claims (2)

A cylindrical first mounting member coupled to either one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body for connecting these two mounting members to each other;
A partition member that partitions the liquid chamber in the first mounting member in which the liquid is enclosed into a main liquid chamber having the elastic body in a part of a wall surface, and a sub liquid chamber;
With
In the partition member,
A main shake orifice that communicates the main liquid chamber and the sub liquid chamber, and causes resonance with respect to an input of shake vibration;
A storage chamber in which the valve member is stored in a displaceable or deformable manner; and
A sub-shake orifice that communicates the storage chamber and the main liquid chamber and causes resonance with respect to an input of shake vibration;
A communication hole that communicates between the storage chamber and the main liquid chamber, and has a smaller flow resistance than the sub-shake orifice;
An idle orifice that communicates with the storage chamber and the auxiliary liquid chamber and causes resonance with respect to an input of idle vibration;
Formed,
The valve member is configured to switch communication between the idle orifice and the storage chamber and blocking of the idle orifice in accordance with displacement or deformation in the storage chamber due to a fluid pressure fluctuation in the main liquid chamber. Shaker. The vibration isolator according to claim 1,
The sub-shake orifice opens toward an inner portion located inside the outer peripheral portion of the surface of the valve member, and the communication hole opens toward the outer peripheral portion on the surface of the valve member. Anti-vibration device characterized.

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