JPH11182613A - Liquid sealing type vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide good vibration damping effect by liquid column resonance action even for vibration inputted in the prying direction. SOLUTION: This vibration control device is equipped with a main shaft metal fitting 1, a rubber elastic body 4 which is adhered onto the peripheral surface of the main shaft metal fitting 1 and has two pairs of first and second recessed parts 46, 47 which are facingly arranged on the both radial sides sandwiching the main shaft metal fitting 1 and are formed axially away from each other, and outer cylinder metal fittings 5 which are arranged coaxailly outside of the rubber elastic body 4 to cover openings of a first and second recessed parts 46, 47 and form a first main liquid chamber 51 and a first sub liquid chamber 52 inter-communicating through a first orifice passage and a second main liquid chamber 54 and a second sub liquid chamber 55 inter-communicating through a second orifice passage. The first main liquid chamber 51 and the second main liquid chamber 54, and the first sub liquid chamber 52 and the second sub liquid chamber 55, when vibration is inputted in the prying direction, are constituted to position on the both axial sides on the vibration input direction side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device suitably used as, for example, a suspension bush of an automobile.

[0002]

2. Description of the Related Art Conventionally, a liquid-filled type vibration damping device is provided at a connecting portion of a suspension arm mounted on an automobile to reduce vibration generated between the suspension arm and a connecting member connected thereto. It is arranged. As shown in FIGS. 6 and 7, the liquid-filled type vibration damping device includes a spindle metal fitting 101 and a pair of stoppers 122, 12 fitted to the outer periphery of the spindle metal fitting 101 and projecting in the centrifugal direction at an axially symmetric position.
2, a pair of ring portions 131, 132 and both ring portions 131, which are coaxially spaced apart from each other outside the main shaft fitting 101 and arranged at both ends in the axial direction.
An intermediate metal fitting 103 including a pair of bridging parts 134 and 134 which are bridged between 132 and form two windows together with both ring parts 131 and 132, a spindle metal fitting 101 and an intermediate metal fitting 1
03 and a pair of recesses 146, 146 and both recesses 14 opening in each of the windows.
6 and 146, a substantially cylindrical rubber elastic body 104 having an orifice groove 148, and concave portions 146 and 146 and an orifice groove 14 disposed coaxially outside the rubber elastic body 104.
And an outer tube fitting (not shown) for forming a main liquid chamber and a sub liquid chamber which are filled with liquid between the concave portions 146 and 146 and communicate with each other through the orifice groove 148. Have been.

[0003] In this liquid filled type vibration damping device, for example, an outer cylindrical fitting is fitted and fixed to a mounting hole provided at one end of a suspension arm, and a main spindle fitting 1 is mounted by a mounting bolt or the like.
01 is attached to the connecting member by fastening.
Then, when vibration occurs between the suspension arm and the connecting member based on vibration from a tire wheel or the like, and the main shaft fitting 101 and the outer cylinder metal are relatively displaced in a direction perpendicular to the axis, the main liquid chamber and the sub liquid A large vibration damping effect can be obtained by the liquid column resonance action of the liquid flowing through the orifice passage with the change in the volume of the chamber.

[0004] The frequency of the vibration suppressed by the liquid filled type vibration damping device is tuned by appropriately setting the length and the cross-sectional area of the orifice passage.

[0005]

By the way, the above-mentioned conventional liquid filled type vibration damping device is disposed between the suspension arm and the connecting member. Along with the vibration in the vertical direction, vibration may be input in a direction in which one of the spindle metal fitting 101 and the outer cylindrical metal fitting is tilted radially with respect to the other (prying direction). When such vibration is input, neither the main liquid chamber nor the sub liquid chamber has a change in volume, so that no liquid flows to the orifice passage. Therefore, a vibration damping effect based on the liquid column resonance action cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a liquid-filled type vibration damping device capable of obtaining a good vibration damping effect by a liquid column resonance action even for vibration input in the twisting direction. Providing is an issue to be solved.

[0007]

According to a first aspect of the present invention, there is provided a spindle metal fitting, which is fixed to an outer peripheral surface of the spindle metal fitting and is opposed to radially opposite sides of the spindle metal fitting. And a substantially cylindrical rubber elastic body having two pairs of recesses formed and spaced apart in the axial direction, and disposed coaxially outside the rubber elastic body to cover the opening of the recess, Via a first orifice passage connecting one of the opposed recesses to a first main liquid chamber and a second auxiliary liquid chamber communicating with each other via a second orifice passage connecting the other recesses radially opposite to each other; A second main liquid chamber and a second main liquid chamber communicating with each other;
An outer cylinder fitting that forms a sub liquid chamber, wherein the first main liquid chamber and the second main liquid chamber, and the first sub liquid chamber and the second sub liquid chamber are each provided with the main shaft fitting and the outer liquid chamber. When a vibration is input in a direction in which one of the cylindrical fittings falls down in the radial direction with respect to the other, a means is adopted which is located on both sides in the axial direction on the side of the vibration input direction.

According to this means, when vibration is input in a direction in which one of the main shaft fitting and the outer cylindrical fitting is inclined in the radial direction with respect to the other, the first main parts located on both sides in the axial direction on the side of the vibration input direction. The capacity of one of the liquid chamber and the second main liquid chamber increases and the capacity of the other decreases. At the same time,
The first sub-liquid chamber and the second sub-liquid chamber which are radially opposed to the first main liquid chamber and the second main liquid chamber and located on both sides in the axial direction have one of the reduced capacity and the other. The volume increases.

With this configuration, the liquid in both the liquid chambers flows through the first orifice passage based on the volume change of the first main liquid chamber and the first sub liquid chamber, and the liquid in the second main liquid chamber and the second sub liquid chamber is changed. The liquid in both liquid chambers flows through the second orifice passage based on the volume change. As a result, a liquid column resonance action is caused by the liquid flowing through the first and second orifice passages, and the vibration input in the twisting direction is effectively attenuated.

Therefore, according to the present invention, it is possible to obtain a good vibration damping effect by the liquid column resonance action even for vibration input in the twisting direction. According to a second aspect of the present invention, in the liquid-filled type vibration damping device according to the first aspect, the first orifice passage and the second orifice passage include:
Means is adopted in which the working frequency range set by the path length and the cross-sectional area is tuned to the same frequency range.

According to this means, the liquid column resonance in the same frequency region occurs in the two orifice passages of the first and second orifice passages, so that the vibration to be suppressed can be reduced more effectively. In addition, it is preferable that the tuning frequencies of the first and second orifice passages are more completely matched.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view along the axial direction of the liquid-filled type vibration damping device according to the present embodiment, and is a cross-sectional view taken along line II of FIG. 2, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is a sectional view taken along line III-III of FIG. 2.

The liquid-filled type vibration damping device of this embodiment is shown in FIG.
As shown in FIG. 3 to FIG. 3, a spindle member 1, a stopper member 2 having two pairs of stoppers 22 and 23 fitted on the outer peripheral surface of the spindle member 1 and projecting in a centrifugal direction at an axially symmetric position, An intermediate metal member 3 which is arranged coaxially spaced apart from the outside and includes three ring portions 31 to 33 and two pairs of bridging portions 34 and 35, and an intermediate metal member 3 interposed between the spindle metal member 1 and the intermediate metal member 3. And two pairs of concave portions 4 opened on the outer peripheral surface thereof.
A substantially cylindrical rubber elastic body 4 having 6, 47 and first and second orifice grooves 48, 49, and concave portions 46, 47 and first and second orifices disposed coaxially outside the rubber elastic body 4. An outer cylinder that covers the openings of the grooves 48 and 49 and forms first and second main liquid chambers 51 and 54, first and second sub liquid chambers 52 and 55, and first and second orifice passages 53 and 56. And a metal fitting 5 as a main element.

The spindle bracket 1 is formed of a metal into a pipe having a predetermined size. The stopper member 2 includes a cylindrical base 21 fitted on the outer peripheral surface of the central portion of the spindle metal fitting 1,
Two pairs of first and second stoppers 2 provided at both ends of the base 21 and formed in a fan shape protruding in the centrifugal direction at axially symmetric positions.
2, 23. The stopper member 2 is entirely formed of resin.

The intermediate fitting 3 includes first to third ring portions 31 to 3 which are coaxially arranged at both ends and a center in the axial direction.
3, a pair of first bridge portions 34 provided at axially symmetric positions between the adjacent first and second ring portions 31 and 32, and an axis between the adjacent second and third ring portions 32 and 33. It comprises a pair of second bridge portions 35 provided at symmetric positions. Two windows defined by the first bridge portion 34 and the first and second ring portions 31 and 32 adjacent to each other are formed between the pair of first bridge portions 34, and the other pair is formed. The second and third bridges 35 adjacent to the second bridge 35 are disposed between
Two windows defined by the ring portions 32 and 33 are formed.

As shown in FIGS. 4 and 5, the rubber elastic body 4 is formed into a substantially cylindrical shape by integrally vulcanizing with the spindle metal fitting 1 and the intermediate metal fitting 3 to which the stopper member 2 is fitted and fixed. Both are integrally connected. The rubber elastic body 4 is provided on the first and third ring portions 31, 3 of the intermediate fitting 3.
Annular side wall portions 41 and 42 located at both ends corresponding to 3;
An annular partition wall portion 43 disposed between the annular side wall portions 41 and 42 corresponding to the second ring portion 32 of the intermediate metal fitting 3, and a first and second bridge portions 34 and 35 of the intermediate metal fitting 3. Arm-shaped partition portions 44 and 45 extending radially and dividing the space between the two annular side wall portions 41 and 42 into two.

Thus, between the annular side wall portion 41 and the annular partition wall portion 43 and between the annular partition wall portion 43 and the annular side wall portion 42, two pairs of first and second openings that open to the windows of the intermediate fitting 3 are provided. First and second concave portions 46 and 47 are formed. The first and second stopper portions 22, 2 of the stopper member 2 fixed to the spindle metal fitting 1 are provided in the first and second concave portions 46, 47.
3 protrudes, and the first and second stopper portions 22, 2
The surface of 3 is covered with a rubber elastic body 4.

A first orifice groove 48 and a second orifice 47 are formed on the outer peripheral surface of one of the arm-shaped partition walls 44. The first orifice groove 48 and the second orifice 47 connect the pair of the first concaves 46 arranged in the radial direction. Two orifice grooves 49 are formed. Depressed portions 44a and 45a for adjusting spring characteristics are provided on both end surfaces in the axial direction of the arm-shaped partition portions 44 and 45, respectively.

The outer tube fitting 5 is formed in a cylindrical shape from metal. The outer tube fitting 5 is fitted coaxially outside the rubber elastic body 4 and then attached by crimping both ends inward in the radial direction. As a result, the outer metal fitting 5 covers the openings of the first and second recesses 46 and 47 and the first and second orifice grooves 48 and 49 of the rubber elastic body 4, and via the first orifice passage 53. The first main liquid chamber 51 and the first sub liquid chamber 52 communicating with each other and the second main liquid chamber 54 and the second sub liquid chamber 55 communicating with each other via the second orifice passage 56 are arranged in parallel in the axial direction. Is formed.
That is, the first and second main liquid chambers 51 and 54 and the first and second sub liquid chambers 52 and 55 are arranged so as to face each other on both radial sides with the main spindle 1 interposed therebetween.

The first orifice passage 53 and the second orifice passage 56 are tuned for the frequency of vibration to be suppressed by appropriately setting the length and cross-sectional area of the first orifice passage 53 and the second orifice passage 56. The tuning frequency range of the second orifice passage 56 is set to be the same frequency range. The first main liquid chamber 51, the first sub liquid chamber 52, the second main liquid chamber 54, and the second
The sub liquid chamber 55 is filled with a liquid L made of an incompressible fluid such as water, alkylene glycol, or silicone oil. The liquid L is supplied to the spindle fitting 1, the stopper member 2
A molded body formed by integrally vulcanizing the rubber elastic body 4 together with the intermediate metal fitting 3 is immersed in a water tank filled with the liquid L to be sealed, and the outer cylindrical metal fitting 5 is placed outside the rubber elastic body 4. Are fitted and fixed.

In the liquid-filled type vibration damping device of the present embodiment having the above-described configuration, for example, the outer cylinder fitting 5 is fitted and fixed in a mounting hole provided at one end of the suspension arm, and the main shaft is attached by a mounting bolt or the like. It is attached by fastening the metal fitting 1 to the connecting member. In this case, the axial direction of the main shaft 1 and the outer tube 5 is positioned vertically, and the arm-shaped partition portions 44 and 45 of the rubber elastic body 4 are positioned in the front-rear direction of the vehicle, and the first and second main liquid chambers 51 are formed. , 54 and the first and second auxiliary liquid chambers 52, 55 are arranged so as to be located in the vehicle left-right direction. That is, when the tire wheel vibrates in the vertical direction and vibration in the prying direction is input to the liquid-filled type vibration damping device, the first and second main liquid chambers 51 and 54 and the first and second
The auxiliary liquid chambers 52 and 55 are arranged so as to be located on both sides in the twisting direction.

Then, with the vertical vibration of the tire wheel, a twisting direction (FIG. 1) is applied to the liquid filled type vibration damping device.
1), the first main liquid chamber 51 and the second main liquid chamber 5 located on both sides in the axial direction on the side of the vibration input direction.
In No. 4, one volume increases and the other volume decreases. At the same time, the first main liquid chamber 51 and the second
The first sub-liquid chamber 52 and the second sub-liquid chamber 55, which are disposed radially opposite to the main liquid chamber 54 and located on both sides in the axial direction, decrease the volume of one of them and increase the volume of the other.

Accordingly, the liquid L in both the liquid chambers 51 and 52 flows through the first orifice passage 53 based on the volume change of the first main liquid chamber 51 and the first sub liquid chamber 52,
The liquid L in both the liquid chambers 54 and 55 flows through the second orifice passage 56 based on a change in volume of the main liquid chamber 54 and the second sub liquid chamber 55. Thus, the first and second orifice passages 5
A liquid column resonance action is caused by the liquid L flowing through the liquids 3, 56, and the vibration input in the twisting direction is effectively attenuated.

Since the first orifice passage 53 and the second orifice passage 56 are tuned to the same frequency range, the two first and second orifice passages 5 are used.
At columns 3 and 56, a liquid column resonance action in the same frequency region occurs, and the vibration input in the twisting direction is more effectively reduced. When vibration occurs between the suspension arm and the connecting member based on vibration from a tire wheel or the like, and the main shaft 1 and the outer tube 5 are relatively displaced in a direction perpendicular to the axis, one of the vibration input directions may be used. The first and second main liquid chambers 51 and 54 on the other side and the first and second sub liquid chambers 52 and 5 on the other side.
In No. 5, the volume on one side increases and the volume on the other side decreases. As a result, a liquid column resonance action is caused by the liquid L flowing through the first and second orifice passages 53 and 56, and the vibration generated between the suspension arm and the connecting member is effectively attenuated.

As described above, according to the liquid filled type vibration damping device of the present embodiment, the first main liquid chamber 51 and the second main liquid chamber 54 and the first sub liquid chamber 52 and the second sub liquid chamber 55 are When vibration is input in the twisting direction, it is configured to be located on both sides in the axial direction on the side of the vibration input direction. A damping effect can be obtained.

Further, the first orifice passage 53 and the second orifice passage 56 are tuned to the same frequency region because the working frequency region set by their passage length and cross-sectional area is tuned to the same frequency region. Since the liquid column resonance action in the same frequency region occurs in the second orifice passages 53 and 56, the vibration to be suppressed can be reduced more effectively.

[Brief description of the drawings]

FIG. 1 is a sectional view along an axial direction of a liquid filled type vibration damping device according to an embodiment of the present invention, and is a sectional view taken along line II of FIG.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

4 is a front view of a molded body formed by integrally vulcanizing the rubber elastic body according to the embodiment of the present invention, and is a front view as seen from the direction of arrow A in FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a front view of a molded body formed by integral vulcanization molding of a rubber elastic body according to a conventional liquid filled type vibration damping device.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main shaft fitting 2 ... Stopper member 3 ... Intermediate fitting 4 ... Rubber elastic body 5 ... Outer cylinder fitting 21 ... Base 22 ... 1st stopper 23 ... 2nd stopper 3
DESCRIPTION OF SYMBOLS 1 ... 1st ring part 32 ... 2nd ring part 33 ... 3rd ring part 3
4 First bridge portion 35 Second bridge portion 41, 42 Annular side wall portion 43 Partition wall portion 44, 45 Arm-shaped partition wall portion 46 First concave portion 47 Second concave portion 48 First
Orifice groove 49: second orifice groove 51: first main liquid chamber
52: first sub liquid chamber 53: first orifice passage 54: second main liquid chamber 55: second sub liquid chamber 56: second orifice passage

Claims (2)

[Claims] 1. A spindle metal fitting, and has two pairs of recesses fixed to the outer peripheral surface of the spindle metal fitting, disposed opposite to each other in the radial direction with the spindle metal fitting therebetween, and formed to be spaced apart in the axial direction. A substantially cylindrical rubber elastic body; and a first orifice passage disposed coaxially outside the rubber elastic body to cover an opening of the concave portion and connect one of the concave portions facing each other in the radial direction. A second main liquid chamber and a second sub liquid chamber communicating with each other via a second orifice passage connecting the other of the recesses radially opposed to the first main liquid chamber and the first sub liquid chamber communicating with each other are formed. Outer cylinder fitting
Wherein the first main liquid chamber and the second main liquid chamber, and the first sub liquid chamber and the second sub liquid chamber are arranged such that one of the main shaft fitting and the outer cylinder fitting is arranged radially with respect to the other. A liquid-filled type vibration damping device characterized in that, when vibration is input in a falling direction, the liquid-filled type vibration damping device is configured to be located on both sides in the axial direction on the side in the vibration input direction. 2. An operating frequency region set by the first orifice passage and the second orifice passage set by the passage length and the cross-sectional area thereof is tuned to the same frequency region. The liquid filled type vibration damping device as described in the above.