JPH084828A - Vibration control device - Google Patents

Abstract

PURPOSE:To ensure opening and closing of a restricted passage by forming a valve supporting part into a predetermined specified dimension and shape. CONSTITUTION:A circular hole 44 and a cylindrical hole part 50 which is coaxial with the circular hole 4 and whose diameter is smaller than the circular hole 44 is formed in a middle block 18. A groove part 62 is circulatingly-formed around the circular hole 44, and a section between the inner periphery surface and the outer peripheral surface in the groove part 64 is jointed with plural ribs 72 which extends in a radial direction. The thickness around the circular hole 44 and the hole part 50 is roughly constant and formed into relatively thin shape, so it is possible to form the dimension and shape of the circular hole 44 and the hole part 50 into predetermined specific values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for damping and absorbing vibrations from a vibration generator, and is suitable as an engine mount for automobiles.

[0002]

2. Description of the Related Art An anti-vibration device as an engine mount is arranged between an engine and a vehicle body of an automobile, and the anti-vibration device prevents the vibration of the engine from being transmitted to the vehicle body. There is.

Inside this type of vibration isolator, a main liquid chamber and a sub liquid chamber filled with liquid are formed separated by a partition member, and the main liquid chamber and the sub liquid chamber are shake-vibrated. They are in communication with each other via a plurality of restricted passages for absorbing (e.g. vibrations with a frequency of less than 15 Hz) and idle vibrations (e.g., vibrations with a frequency of 20-40 Hz).

An opening / closing member, which is a valve for opening / closing the limiting passage under the control of the control means, is arranged in at least one of the plurality of limiting passages, and the opening / closing member is the main liquid. The chamber and the auxiliary liquid chamber are made to communicate with each other or not to communicate with each other.

From the above, when a shake vibration occurs, for example, the opening / closing member causes the restriction passage to be in a non-communication state, and the liquid flows between the main liquid chamber and the auxiliary liquid chamber only through the other restriction passage. To be in a state to do.

[0006]

On the other hand, the partition member employed in the vibration isolator as described above is generally manufactured by molding using a resin material as a material because of the relationship of forming a restricted passage therein. . However, at the time of molding with a resin material, it is necessary to make the dimensions and shape of the thick wall portion have a predetermined size and shape, because the sinking of the resin material accompanying the molding processing and the resin shrinkage due to heat shrinkage during the molding processing More difficult than problems such as dimensional changes.

Therefore, in the case where a columnar valve support portion is formed in a thick partition wall member for supporting the opening / closing member, it is difficult to ensure the roundness of the valve support portion. It was

In view of the above facts, the present invention is to provide a vibration isolator in which a valve support portion is formed in a predetermined size and shape and the like so that the restricted passage can be opened and closed surely.

[0009]

According to another aspect of the present invention, there is provided a vibration isolator, comprising: a first mounting member connected to one of a vibration generating portion and a vibration receiving portion; and a vibration detecting portion and a vibration receiving portion connected to the other. A second mounting member, an elastic body provided between the first mounting member and the second mounting member and deformable when vibration occurs, and the elastic body can be expanded and contracted as at least a part of a partition wall. A main liquid chamber filled with the liquid, a sub liquid chamber filled with the liquid, and a space between the main liquid chamber and the sub liquid chamber, and a space between the main liquid chamber and the sub liquid chamber. A partition wall member made of resin in which a restriction passage communicating with the partition wall member is formed, a valve support portion formed in a portion of the partition wall member corresponding to the restriction passage member and having an annular groove portion in the periphery thereof, and the valve member having an annular shape. It is possible to open and close the limiting passage and ribs that connect the inner peripheral surface side and the outer peripheral surface side in the groove. A closing member which is supported by the valve support portion, and having a driving means for opening and closing movement of said closing member to open and close said restricted passage in accordance with the frequency of vibration by the vibration generating portion.

[0010]

The operation of the vibration isolator according to claim 1 will be described below.

When the vibration generator generates vibration, the first
The vibration is transmitted to the elastic body through the mounting member or the second mounting member, and the vibration is absorbed by the deformation of the elastic body to the vibration receiving portion side connected to the second mounting member or the first mounting member. Vibration becomes difficult to be transmitted.

Further, the main liquid chamber expands and contracts with the deformation of the elastic body, and accordingly, the liquid flows between the sub liquid chamber and the main liquid chamber which are connected to the main liquid chamber through the restriction passage, Viscous resistance of liquid flow in the restriction passage and damping action based on liquid resonance,
The vibration damping effect can be improved.

Further, the opening / closing member supported by the valve supporting portion formed on the partition member that separates the main liquid chamber and the sub liquid chamber from each other is provided with the limiting passage according to the frequency of the vibration generated by the vibration generating unit. Is opened and closed by the drive means.

On the other hand, since the annular groove portion is formed around the valve support portion, the size and shape of the valve support portion can be made predetermined. Therefore, there is no possibility that a gap is created between the valve support portion and the opening / closing member, liquid leaks, or the opening / closing member is in strong contact with the valve supporting portion so that the opening / closing member is difficult to open / close within the valve supporting portion.

Since the inner peripheral surface side and the outer peripheral surface side in the groove are connected by ribs, deformation of the valve supporting portion is prevented when vibration occurs, and the size and shape of the valve supporting portion are prevented. It is possible to prevent such changes.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolation device according to an embodiment of the present invention is shown in FIGS. 1 to 6, and this embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 3, a vibration isolation device 10
Is attached to the vehicle body in a state where the outer cylinder 16 is fitted and press-fitted into the annular portion 11A of the attachment frame 11 that is attached to the vehicle body as a vibration receiving portion (not shown). The vibration isolator 10 includes a cylindrical inner cylinder 12 arranged substantially parallel to a cylindrical outer cylinder 16. In the present embodiment, the inner cylinder 12 is not shown as a vibration generator. It is connected to the engine. Therefore, for example, the inner cylinder 12 serves as the first mounting member and the outer cylinder 16 serves as the second mounting member.

On the other hand, the thin rubber layer 13 is provided inside the outer cylinder 16.
Is vulcanized and bonded, and a part of the thin rubber layer 13 is a first diaphragm 22 separated from the inner peripheral surface of the outer cylinder 16.

A pair of intermediate blocks 17 and 18 are inserted in the outer cylinder 16. As shown in FIG. 1, the intermediate block 18, which is a partition wall member made of synthetic resin, is formed by injection molding into a substantially semicircular block shape when viewed from the axial direction of the outer cylinder 16. The outer peripheral surface of the intermediate block 18 is in close contact with the inner peripheral surface of the thin rubber layer 13. As shown in FIG. 3, flange portions 17A are formed at both axial ends of the intermediate block 17, and the outer peripheral surface of the flange portion 17A is in close contact with the thin rubber layer 13. The intermediate block 18 is fitted between the flange portions 17A.

As shown in FIG. 1, a notch 17B is formed in the center of the intermediate block 17 facing the intermediate block 18, and the above-mentioned inner cylinder 12 penetrates the notch 17B. A main body rubber 14, which is an elastic body, is laid between the inner cylinder 12 and the intermediate block 17. As a result, the inner cylinder 12 can move relative to the outer cylinder 16.

The body rubber 14 is also vulcanized and adhered to the top surface of the intermediate block 18, and the notch portion 14A forming a main liquid chamber 28 between the body rubber 14 and the intermediate block 18 is formed in the middle portion of the body rubber 14. Are formed. Further, the inner peripheral surface of the intermediate block 17 is located between the flange portions 17A of the intermediate block 1.
A first auxiliary liquid chamber 30 is formed which is partitioned by 7 and whose outer peripheral surface is partitioned by the thin rubber layer 13 and the first diaphragm 22. The main liquid chamber 28 and the first auxiliary liquid chamber 30 are filled with a liquid such as water or oil.

Further, in the intermediate block 18, the main liquid chamber 2
8 is formed with a circular hole 44 whose one end faces in FIG. 1 and which extends in the vertical direction in the vertical direction. The circular hole 44 has a lower portion coaxial with the circular hole 44 and having a diameter smaller than that of the circular hole 44. The cylindrical hole portion 50 is formed so as to penetrate to the spot facing portion formed on the lower side of the intermediate block 18. That is, the circular hole 44 and the hole portion 50 form a valve support portion.

As shown in FIGS. 4 to 6, the circular hole 44
A groove portion 62 is formed in an annular shape around the circle so as to surround the circular hole 44, and the inner peripheral surface side and the outer peripheral surface side in the groove portion 62 are connected by a plurality of ribs 66, 68, 70. ing. Therefore, these ribs 66, 68 and 70 allow the annular groove portion 6 to be formed.
2 is divided into a plurality of concentric slits. That is, the inner and outer peripheral surfaces of the groove portion 62 are connected by a pair of thick ribs 66, 68 and a plurality of thin ribs 70 (three in this embodiment) radially formed to be thinner than the thick ribs 66, 68. The ribs 66, 68, 70 reinforce the cylindrical wall portion forming the circular hole 44.

Further, the holes 5 are also provided around the holes 50.
The groove portion 64 is formed in an annular shape so as to surround 0, and the inner peripheral surface side and the outer peripheral surface side in the groove portion 64 are connected by a plurality of radially extending ribs 72 (four in this embodiment). ing.
Therefore, the groove portion 64 is formed concentrically with the groove portion 62, and the groove portion 64 is divided into a plurality of concentric circular slits by the plurality of ribs 72.

On the other hand, the intermediate block 18 is provided with a passage 32 and a passage 36 which are restricted passages toward the outside of the circular hole 44. One end of the passage 32 passes through the side face forming the circular hole 44 and the thick rib 66 to communicate with the circular hole 44, and the other end of the passage 32 is formed on the outer peripheral surface of the intermediate block 18 to form the first sub liquid chamber 30. It is communicated with the passage 33 which is communicated with.

Further, one end of the passage 36 communicates with the circular hole 44 through the side surface forming the circular hole 44 and the thick rib 68, and the other end of the passage 36 is formed on the outer peripheral surface of the intermediate block 18. Of the secondary liquid chamber 40.

As shown in FIG. 1, the second auxiliary liquid chamber 40 has through-holes (not shown) formed by penetrating between the outer cylinder 16 and the inner and outer peripheral surfaces of the annular portion 11A of the mounting frame 11, respectively. The outer cylinder 1 faces each other with the thin rubber layer 13 interposed therebetween.
The thin rubber layer 13 at a portion facing the through hole 6 is the second diaphragm 24. An air chamber 26 for accumulating air is installed between the second diaphragm 24 and the inner wall surface of the outer cylinder 16.

The longitudinal dimension of the passage 36 is shorter than the longitudinal dimension of the passage 32 so that the passage resistance of the passage 36 is smaller than the passage resistance of the passage 32. Further, in the present embodiment, the passage 32 is formed so as to be able to absorb vibration (idle vibration) in a relatively high frequency band of low frequencies, and the passage 36 is effective for high-frequency vibration (crowded sound). It is formed so that it can be absorbed.

On the other hand, a rotor valve 52, which is an opening / closing member, is inserted into the circular hole 44 and supported in the circular hole 44, and a small-diameter sliding portion 5 constituting the lower portion of the rotor valve 52.
2A is rotatably fitted in the hole 50. And
An O-ring 51 is arranged between the sliding portion 52A and the hole 50 to prevent liquid leakage from the main liquid chamber 28. Further, the sliding portion 52A of the rotor valve 52 has the outer cylinder 1
6 is connected to a connecting portion 48A of a motor 48 which is a driving means attached to the outer periphery of the rotor 6, and the rotor valve 52 can be rotated by receiving the driving force of the motor 48.

Further, the motor 48 is connected to the control means 46, and the control means 46 is connected to the vehicle speed sensor 43 for detecting the vehicle speed and the engine speed sensor 45 for detecting the engine speed. In order to prevent the rotor valve 52 from coming off, a saddle-shaped stopper 21 as shown in FIG. 3 is fixed to the intermediate block 18 corresponding to the circular hole 44.

The front end of the rotor valve 52 facing the main liquid chamber 28 has a cylindrical shape, and a through hole 54 is formed in a part of the cylindrical peripheral surface of the rotor valve 52. Depending on the rotational position of the rotor valve 52, the through hole 54 is arranged at a position where only the passage 32 is in communication as shown in FIG. 1 or only the passage 36 is in communication as shown in FIG. .

A passage 34 is formed in the intermediate block 18. The cross-sectional area of the passage 34 is equal to that of the passage 3
The length in the longitudinal direction (the passage direction of the liquid) is made longer than the length in the longitudinal direction of the passages 32 and 36, and the passage resistance of the passage 34 is set to be larger than that of the passages 32 and 36. ing. As a result, the passage 34 can effectively absorb vibration (shaking vibration) in a relatively low frequency band of low frequencies.

The passage 34 communicates with the main liquid chamber 28 by opening one end 34A at a surface corresponding to the main liquid chamber 28 of the intermediate block 18, and the passage 34 has the other end 34B. Through the first auxiliary liquid chamber 30. The passage 34 extends downward from one end portion 34A in FIG. 1, penetrates the intermediate block 18, and further has an extended end extending along the outer peripheral edge portion of the intermediate block 18 and the other end portion 34.
It has been extended to B.

From the above, the through hole 54 of the rotor valve 52
2, the passage 36 communicates with the main liquid chamber 28, and the passage 32 is closed by the peripheral wall of the rotor valve 52. In this state, the liquid flows back and forth between the main liquid chamber 28, the circular hole 44, and the passage 36, and the second The diaphragm 24 is deformed so that the second auxiliary liquid chamber 40 expands and contracts. An air chamber is formed between the first diaphragm 22 and the outer cylinder 16 and communicates with the outside as necessary.

The operation of this embodiment will be described below. When the engine generates vibration, the vibration is transmitted to the main body rubber 14 via the inner cylinder 12, and the vibration is absorbed by the deformation of the main body rubber 14, and the vibration is less likely to be transmitted to the vehicle body side connected to the outer cylinder 16. Become.

The main liquid chamber 28 expands and contracts with the deformation of the main body rubber 14, and accordingly, the sub liquid chambers 30, 40 and the main liquid chambers 40 and 36 connected to the main liquid chamber 28 through the passages 32, 34, 36 are formed. Two
The liquid circulates between the liquid passages 8 and 8, and the vibration damping effect can be improved by the viscous resistance of the liquid flow in the passages 32, 34, 36 and the damping action based on the liquid resonance.

Further, a circular hole 44 is formed in the intermediate block 18 which separates the main liquid chamber 28 from the auxiliary liquid chambers 30 and 40, and a rotor valve 52 supported by the circular hole 44 is generated by the engine. Passage 3 according to the frequency of vibration
It is opened and closed by a motor 48 so as to open and close 2, 36.

On the other hand, since the circular groove portions 62 and 64 are formed around the circular hole 44 and the hole portion 50, the wall thickness around the circular hole 44 and the hole portion 50 is substantially constant and relatively large. Since the intermediate block 18 is thinly formed, it is possible to make the size and shape of the circular hole 44 and the hole 50 predetermined when the intermediate block 18 is formed. For this reason, a liquid may leak between the circular hole 44 and the hole portion 50 and the rotor valve 52, or the rotor valve 52 may come into close contact with the circular hole 44 and the hole portion 50 so that the rotor valve 52 is circular. It does not become difficult to open and close within the hole 44 and the hole 50.

Further, since the inner peripheral surface side and the outer peripheral surface side in the groove portions 62, 64 are connected by the ribs 66, 68, 70, 72, when vibrations of the circular hole 44 and the hole portion 50 occur. Therefore, the deformation of the circular hole 44 and the hole 50 is prevented from being changed.

Next, a specific example of vibration isolation by rotation of the rotor valve 52 within the circular hole 44 will be described below.

For example, when vibration in a relatively high frequency band of low frequencies (idle vibration) occurs, the control means 46.
Determines by the vehicle speed sensor 43 and the engine speed sensor 45 that idle vibration is occurring. And
In this case, the motor 48 is controlled so that the through hole 54 of the rotor valve 52 reaches a position where only the passage 32 is in the communicating state (position in FIG. 1). As a result, the liquid flows back and forth between the main liquid chamber 28 and the first sub liquid chamber 30 through the passage 32, and the liquid column resonates in the passage 32 to absorb the idle vibration.

Further, when vibration (muffled sound) in the high frequency band occurs, the control means 46 determines that the muffled sound is generated by the vehicle speed sensor 43 and the engine speed sensor 45. In this case, the rotor valve 52
The motor 48 is controlled so as to reach the position (the position in FIG. 2) where only the passage 36 is brought into the communication state by the through hole 54 of. In this state, a muffled sound is generated,
The passage 34 having a high passage resistance is clogged.

Therefore, the liquid comes and goes between the main liquid chamber 28 and the second sub liquid chamber 40 via the rotor valve 52, and the liquid resonates in the liquid column in the passage 36 to lower the liquid. It becomes a double and the muffled sound is absorbed.

Further, when vibration in a relatively low frequency band of low frequencies (shaking vibration) occurs, the control means 4
In No. 6, the vehicle speed sensor 43 and the engine speed sensor 45 determine that shake vibration is occurring. Then, in this case, the motor 48 is controlled by the rotor valve 52 so as to reach a position where the passage 32 and the passage 36 are both in the non-communication state.

As a result, the liquid flows back and forth between the main liquid chamber 28 and the first sub liquid chamber 30 through the passage 34, and the liquid is highly attenuated due to the resistance and liquid column resonance when passing through the passage 34. The shake vibration is absorbed.

In the above-described embodiment, the sub-liquid chamber is composed of the first sub-liquid chamber 30 and the second sub-liquid chamber 40. The opening / closing of the passage 32 connected to the liquid chamber 30 may be performed only by the rotor valve 52.

Although the opening / closing member is the rotor valve 52, it goes without saying that it may be another general valve.

Further, in the above-mentioned embodiment, the inner cylinder is connected to the engine and the outer cylinder is connected to the vehicle body side, but the structure may be reversed. On the other hand, in the above embodiment, the purpose is to prevent the vibration of the engine mounted on the vehicle.
It goes without saying that the vibration damping device of the present invention is used for other purposes, and the shape and the like are not limited to those of the embodiment.

[0049]

Since the vibration isolator according to the present invention is constructed as described above, it is excellent in that the valve support can be formed in a predetermined size and shape, etc., to surely open and close the restricted passage. Have an effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vibration isolation device according to an embodiment of the present invention.

FIG. 2 is an operation diagram of FIG.

FIG. 3 is an exploded perspective view of a vibration damping device according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of an intermediate block adopted in a vibration isolator according to an exemplary embodiment of the present invention, which is a view taken along line 4-4 of FIG.

FIG. 5 is a plan view of an intermediate block adopted in the vibration control device according to the embodiment of the present invention.

6 is a view taken along the line 6-6 of FIG.

[Explanation of symbols]

 10 Vibration Isolator 12 Inner Cylinder (First Mounting Member) 14 Main Body Rubber (Elastic Body) 16 Outer Cylinder (Second Mounting Member) 18 Intermediate Block (Partition Wall Member) 28 Main Liquid Chamber 30 First Sub Liquid Chamber ( Sub liquid chamber 40 Second sub liquid chamber (sub liquid chamber) 44 Circular hole (valve support portion) 48 Motor (driving means) 50 Hole portion (valve support portion) 52 Rotor valve (opening / closing member) 62 Groove portion 64 Groove portion 66 Thick rib 68 Thick rib 70 Thin rib 72 Rib

Claims (1)

[Claims] 1. A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the first mounting member. An elastic body that is provided between the member and the second mounting member and that deforms when vibration occurs; a main liquid chamber that is expandable and contractible using the elastic body as at least a part of the partition wall and filled with liquid; A partition member made of resin in which a sub-liquid chamber to be filled and a limiting passage that isolates the main liquid chamber and the sub-liquid chamber from each other and connects the main liquid chamber and the sub-liquid chamber is formed. And a valve support portion formed in a portion of the partition member corresponding to the restricted passage and having an annular groove portion in the periphery, and between the inner peripheral surface side and the outer peripheral surface side in the annular groove portion. A rib connecting the opening and closing, and an opening / closing supported in the valve supporting portion so that the restriction passage can be opened / closed. Vibration damping device for a timber, characterized by having the driving means for opening and closing movement of said closing member to open and close said restricted passage in accordance with the frequency of vibration by the vibration generating portion.