JPH11190386A - Liquid sealing type vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dispersion of an installing position and fixing strength of an action member arranged in a liquid sealing type vibration isolating device. SOLUTION: A flange metal fitting 28 extending outward of a radial direction is fixed to one end side of an axial direction of an inner cylindrical metal fitting 10. An outer cylindrical metal fitting 20 is coaxially arranged outward of a radial direction of the inner metal fitting 10 at a prescribed distance, and a second flange part 22 extending outward of a radial direction is arranged on one end side of the axial direction of the outer metal fitting 20. A first rubber elastic body 13 for elastically connecting both inner and outer metal fittings 10, 20 is arranged between them. A second rubber elastic body 23 for elastically connecting both first and second flange parts is arranged between the first and second flange parts. An annular liquid chamber 29 formed in continuity to a circumferential direction is arranged between the inner and outer metal fittings 10, 20. An annular rubber elastic body acting part 26 which is fixed integratedly along a circumferential direction and which is projected toward the inside of the liquid chamber is arranged near the second flange part 22 arranged on an inner circumferential surface of the outer metal fitting 20, and a vibration acting part V is formed between the annular rubber elastic body acting part 26 and the liquid chamber inner surface.

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 used for a vehicle body mount or the like.

[0002]

2. Description of the Related Art Conventionally, this type of liquid-filled type vibration damping device is
For example, as shown in Japanese Patent Publication No. 6-94889 (see FIGS. 7 and 8), an inner cylindrical fitting integrally having a flange portion 1b extending radially outward at one axial end of a cylindrical portion 1a. 1, a cylindrical portion 2a coaxially disposed at a predetermined distance radially outward of the cylindrical portion 1a, and a radially outwardly extending end at one axial end thereof, and a shaft extending relative to the flange portion 1b. 2b opposed to each other at a predetermined distance in the direction
And an outer cylinder fitting 2 integrally having the above. A rubber elastic body 3 for elastically connecting the cylindrical portions 1a and 2a is interposed between the cylindrical portions 1a and 2a. A thick portion 3 in which a portion of the rubber elastic body 3 opposed in one radial direction (left and right directions in the drawing) across the inner cylindrical fitting 1 extends substantially parallel to the radial direction between the inner and outer cylindrical fittings.
a. Further, a portion opposed to the thick portion 3a of the rubber elastic body 3 across the inner cylinder 1 in the direction perpendicular thereto is thinned and extends substantially parallel to the axial direction between the inner and outer cylinders. A pair of thin rubber walls 3b are formed on the inner cylinder 1 side and connected to the outer cylinder 2 on the other side in the axial direction.

A rubber elastic body 5 for elastically connecting the two flange parts 1b and 2b is interposed between the flange part 1b and the flange part 2b.
An annular liquid chamber 6 formed continuously between the inner and outer cylindrical fittings in the circumferential direction is disposed between the inner and outer cylindrical fittings. In the liquid chamber 6, there is provided an annular operating member 7 that forms a vibration operating portion V with a predetermined gap between itself and the inner surface of the liquid chamber 6.

This liquid filled type vibration damping device has a hard spring rigidity in one radial direction (thick portion direction) and a soft spring rigidity in another radial direction (thin rubber wall portion disposing direction) perpendicular thereto. , And the low dynamic spring characteristic with respect to the input vibration in the axial direction is effectively exhibited based on the flow of the liquid in the vibrating portion. This liquid-filled type vibration damping device is interposed, for example, in a mounting portion of a suspension member of a vehicle with respect to a body main body, and reduces road noise and the like in an axial direction that is a vehicle vertical direction to improve a ride comfort of the vehicle. In the right angle direction, the vehicle's attitude change is suppressed in one radial direction (thick portion direction), which is the left-right direction of the vehicle, to improve steering stability, and one radial direction (thin rubber wall portion, which is the vehicle's front-rear direction). Direction), the harshness and the like are reduced to improve the riding comfort of the vehicle.

[0005]

By the way, in the above-mentioned liquid filled type vibration damping device, the operating member 7 is provided between the inner surface of the liquid chamber 6 and the operating member 7 which is an individual member. Since it is mounted in the interior, there are variations in the mounting position and the fixing strength, and as a result, it is difficult to maintain stable vibration-proof characteristics of the liquid-filled vibration-proof device. The operating member 7
Since the is small, there may be a problem such as forgetting to assemble. An object of the present invention is to solve the above-described problems, and to provide a liquid-filled type vibration damping device that can prevent a variation in a mounting position and a fixing strength of an operation member and can avoid forgetting to assemble the operation member. With the goal.

[0006]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to claim 1 is characterized in that one end of the first cylindrical portion in the axial direction has a radially outer portion. An inner cylindrical metal fitting integrally having a first flange portion extending in a direction toward the first cylindrical portion, a second cylindrical portion concentrically arranged at a predetermined distance radially outward of the first cylindrical portion, A second flange portion extending radially outward at one axial end of the second cylindrical portion and opposed to the first flange portion at a predetermined axial distance from the first flange portion; A first rubber elastic body interposed between the first cylindrical portion and the second cylindrical portion to elastically connect the first and second cylindrical portions; Formed by thinning a portion of the first rubber elastic body which faces in one direction in the radial direction with the inner cylindrical metal member interposed therebetween;
A pair of thin rubbers each extending substantially in parallel with the axial direction between the inner cylindrical fitting and the outer cylindrical fitting, and being connected to the inner cylindrical fitting at one axial end and to the outer cylindrical fitting at the other axial end, respectively. A first rubber elastic body interposed between the wall portion, the first flange portion and the second flange portion, and elastically connecting the first and second flange portions; An annular liquid chamber disposed between the elastic body and the second rubber elastic body, formed between the inner and outer cylindrical fittings in the circumferential direction, and having a liquid sealed therein; and an inner periphery of the outer cylindrical fitting. An annular member integrally fixed along the circumferential direction at a position near the second flange portion of the surface and protruding toward the liquid chamber, and forming a vibration acting portion with a predetermined gap between the protruding end and the surface of the liquid chamber. That is, a rubber elastic body acting portion is provided.

[0007] In the invention according to the first aspect, the annular rubber elastic body acting portion forming a vibration acting portion with a predetermined gap between itself and the inner surface of the liquid chamber is connected to the second cylindrical member of the outer cylinder.
By fixing integrally by vulcanization molding in the vicinity of the flange part, the dispersion of the mounting position and fixing strength of the rubber elastic body acting member can be eliminated, and the stable vibration-proof characteristics of the liquid-filled vibration-proof device can be secured. be able to. Further, since the rubber elastic body working portion is formed simultaneously with the second rubber elastic body and the like by rubber vulcanization molding, it is possible to reliably prevent the inconvenience of forgetting to assemble the rubber elastic body.

Further, according to the first aspect of the present invention, since the rubber elastic body acting portion is made of rubber, a flexible displacement is possible in the axial vibration which is the main vibration input direction, and the liquid in the vibrating acting portion is provided. The pinpoint effect of vibration transmission reduction due to column resonance is slightly inferior to that of a rigid working member, but the width of the frequency region that reduces vibration transmission can be increased,
It is possible to suppress the rise of the anti-resonant high dynamic spring generated on the frequency side higher than the resonance frequency region of the vibration action section. Therefore, it is possible to exhibit a vibration-damping function in a wide frequency range while suppressing a decrease in the vibration-damping function due to a high dynamic spring generated on the high frequency side of the liquid-filled vibration-damping device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are sectional views of a liquid-filled type vibration damping device used for a body mount of an automobile according to the embodiment. It is shown by a diagram and a plan view. The liquid-filled type vibration damping device includes an inner cylindrical member 10 including a first cylindrical portion 11 and a flange metal member (first flange portion) 28 which is press-fitted and fixed to one end (the lower end in the drawing) of the inner cylindrical metal member 10. An outer cylindrical member 20 coaxially disposed radially outward at a predetermined distance, and a first member between the inner cylindrical member 10 and the outer cylindrical member 20.
The inner cylindrical fitting 10 and the outer cylindrical fitting 20 are integrally and elastically connected by the first rubber elastic body 13. Further, a second rubber elastic body 23 is interposed between the flange fitting 28 and the second flange portion 22 provided at one end (the lower end in the drawing) of the outer tubular fitting 20.

In the liquid filled type vibration damping device, the up-down direction shown in FIG. 1 is the up-down direction of the vehicle, and the up-down direction and the left-right direction shown in FIG. 2 are the front-rear direction and the left-right direction of the vehicle, respectively.
The inner cylinder fitting 10 is attached to a suspension member via a rod (not shown) inserted into the other end, and the outer cylinder fitting 20 is press-fitted and fixed in a mounting hole (not shown) provided in the body body. It is interposed between the suspension member and the body body.

As shown in FIGS. 3 and 4, the first cylindrical portion 11 has a lower portion 11a extending from a substantially intermediate position in the axial direction to one end side slightly smaller than an upper portion 11b extending to the other end side. The projection 11c has a small diameter in the middle portion and slightly protrudes in the left-right direction at an intermediate portion. Further, the inside of the first cylindrical portion 11 is provided with a flange portion 11d projecting from the inner wall in the direction perpendicular to the axis at the intermediate position. An axial length of the first cylindrical portion 11 is radially outward and an intermediate portion in the axial direction.
The metal sleeve 12 of substantially half of the cylindrical portion 11 is coaxially arranged at a predetermined interval. A first rubber elastic body 13 is interposed between the first cylindrical portion 11 and the metal sleeve 12 by vulcanization bonding to form a first vulcanized molded product M.

As shown in FIGS. 3 and 4, the first rubber elastic body 13 extends in one radial direction (left and right directions in the drawing) with the first cylindrical portion 11 interposed therebetween. A portion having substantially the same width as that of the metal sleeve 12 forms a pair of thick portions 13a filled between the upper and lower ends of the metal sleeve 12 in the axial direction. Perpendicularly approximately 1 / peripheral on both sides of the first cylindrical portion 11 perpendicular to the thick portion 13a.
A portion extending over three turns is a pair of thin rubber wall portions 13b.
It has become. The thin rubber wall portion 13b is provided in the first cylindrical portion 1.
1 and the metal sleeve 12 extend substantially in parallel in the axial direction,
The lower end in the axial direction is vulcanized and bonded to the first cylindrical portion 11 and the upper end in the axial direction is vulcanized to the metal sleeve 12.

[0013] As shown in FIG.
A second cylindrical portion 21 having a large diameter is provided, and a second flange portion 22 extending outward is provided at a lower end portion thereof. Outer fitting 20
On the second flange portion 22 side, a connecting metal fitting 27 having a flange portion 27a which is coaxially annular at a predetermined interval and which slightly extends toward the center at the upper end is arranged. Then, the second flange portion 22 of the outer tube fitting 20 and the connection fitting 2
The second rubber elastic body 23 is provided between the flange parts 27a of the first and the second rubber elastic bodies 23, and the second flange part 22 and the flange part 27a are integrally and elastically formed by the second rubber elastic body 23. To form a second vulcanized molded product N. A thin portion of a second rubber elastic body 23 extends on the inner and outer peripheral surfaces of the outer cylindrical fitting 20 except near the upper end of the second cylindrical portion 21, and a seal rubber layer 24 is formed on the inner peripheral surface.
However, the mounting rubber layer 25 is integrally vulcanized on the outer peripheral surface.

At a position near the second flange portion 22 of the outer sleeve 20, an annular rubber elastic member extending in the circumferential direction and in the axial direction is connected to the second rubber elastic member 23. A body action section 26 is provided. Rubber elastic body action part 2
The inner diameter of the first cylindrical portion 11 is smaller than that of the lower portion 11a of the first cylindrical portion 11 in order to provide a gap between the outer peripheral surface of the lower portion 11a of the first cylindrical portion 11 and the vibration acting portion V. It is larger than the outer diameter.

On the side of the second flange portion 22 of the outer cylindrical member 20, the connecting metal member 27 and the above-mentioned flange metal member 28 for insertion into the first cylindrical portion 11 are provided. As shown in FIG. 6, the flange fitting 28 has an annular plate shape whose outer diameter is slightly smaller than the inner diameter of the connecting fitting 27, and has an annular flat portion 28 a on the outer peripheral side and a truncated cone inside. It has a bulging portion 28b, and has a cylindrical portion 28c protruding in the same direction at the center of the bulging portion 28b.

The first vulcanized molded article M formed as described above
Is press-fitted from the upper side of the second vulcanized molded product N, the metal sleeve 12 is inserted into the seal rubber layer 24 of the outer sleeve 20, and the upper end side of the outer sleeve 20 is subjected to drawing to form the metal sleeve 1.
It is integrally connected by caulking to the end of 2. At the same time, the upper end portion of the outer tube fitting 20 is bent toward the radial axis to form the inner bent portion 21a, and the inner bent portion 21a
Are locked to the metal sleeve 12. Further, the flange fitting 28 is inserted into the connecting fitting 27 of the second vulcanized molded product N, and the cylindrical portion 28c of the flange fitting 28 is press-fitted and fixed to the lower portion 11a of the first cylindrical portion 11, and further, Connection fitting 2
7 are bent by bending and engaged with the flange fitting 28 to be integrally connected to each other to form a liquid-sealed type vibration damping device.

By assembling the first vulcanized molded product M, the second vulcanized molded product N, and the flange fitting 28, a first rubber elastic body is provided between the inner cylindrical fitting 10 and the outer cylindrical fitting 20. The both sides in the axial direction are partitioned by the thirteenth and second rubber elastic bodies 23 to form a circumferentially continuous annular space, which is formed as a liquid chamber 29 by filling an incompressible liquid in this space. . The liquid is sealed by performing an assembling operation in a liquid filled with liquid when assembling the first vulcanized molded product M, the second vulcanized molded product N, and the flange fitting 28.
The liquid is filled in the liquid chamber 29. As the liquid, an uncompressed liquid such as water, alkylene glycol, or silicone oil is used. An annular rubber elastic body acting portion 26 provided in the vicinity of the second flange portion 22 of the outer tube fitting 20 protrudes into the liquid chamber 29 to provide a gap between the outer circumferential surface of the inner tube fitting 10 and vibration. The action portion V is set.

In the liquid filled type vibration damping device constructed as described above, the annular rubber elastic body acting portion 26 forming the vibration acting portion V with a predetermined gap between itself and the inner surface of the liquid chamber 29 is connected to the outer cylinder fitting 20.
Is fixed integrally by vulcanization molding in the vicinity of the second flange portion 22. Thus, it is possible to eliminate the variation in the mounting position and the fixing strength of the rubber elastic body acting portion 26, and to stably prevent the liquid filled type vibration damping device. Vibration characteristics can be secured. Further, since the rubber elastic body acting portion 26 is integrally formed by rubber vulcanization molding at the same time as the second rubber elastic body 23 and the like, the inconvenience of forgetting to assemble can be reliably prevented.

Further, since the rubber elastic body acting portion 26 is made of rubber, a flexible displacement is possible in the vibration in the axial direction which is the main vibration input direction, and the vibration transmission is reduced by the liquid column resonance action of the vibration acting portion V. The pinpoint effect is slightly inferior to that of a rigid working member, but the width of the frequency region that reduces vibration transmission can be widened, and the anti-resonance that occurs on the higher frequency side than the resonance frequency region of the vibration acting portion V It is possible to suppress the rise of a typical high dynamic spring to be low. Therefore, it is possible to exhibit a vibration-damping function in a wide frequency range while suppressing a decrease in the vibration-damping function due to a high dynamic spring generated on the high frequency side of the liquid-filled vibration-damping device.

The specific external shape and the like of the liquid-filled type vibration damping device of the present invention are not limited to those shown in the above embodiment, but can be changed as appropriate.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 2 showing a liquid-filled type vibration damping device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the liquid-filled type vibration damping device.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 4, showing a first vulcanized molded product used in the liquid-filled type vibration damping device.

FIG. 4 is a plan view showing the first vulcanized molded product.

FIG. 5 is a cross-sectional view showing a second vulcanized molded product used in the liquid-filled type vibration damping device.

FIG. 6 is a plan view schematically showing the liquid-filled type vibration damping device.

FIG. 7 shows a conventional liquid-filled type vibration damping device of FIG.
It is sectional drawing in the VII-VII line direction.

FIG. 8 is a plan view showing the liquid-filled type vibration damping device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Inner cylinder fitting, 11 ... First cylindrical part, 12 ... Metal sleeve, 13 ... First rubber elastic body, 13a ... Thick part, 13
b: thin rubber wall, 20: external metal fitting, 21: cylindrical part, 2
2 ... second flange portion, 23 ... second rubber elastic body, 24
... seal rubber layer, 25 ... mounting rubber layer, 26 ... rubber elastic body acting part, 27 ... connecting bracket, 27a ... flange part, 28 ...
Flange fittings, 28c: cylindrical portion, 29: liquid chamber, M: first vulcanized molded product, N: second vulcanized molded product, V: vibration acting portion.

Claims (1)

[Claims] 1. An inner cylindrical fitting integrally having a first flange portion extending radially outward at one axial end of a first cylindrical portion, and a radially outer portion of the first cylindrical portion. A second cylindrical portion concentrically disposed at a predetermined distance from the first cylindrical portion, and extending radially outward at one axial end of the second cylindrical portion, and axially extending with respect to the first flange portion. An outer cylindrical member integrally having a second flange portion disposed so as to face a predetermined distance in a direction, and interposed between the first cylindrical portion and the second cylindrical portion. hand,
A first rubber elastic body that elastically connects the first and second cylindrical portions; and a portion of the first rubber elastic body that faces in one radial direction across the inner cylindrical metal fitting. Each of the inner and outer cylinders formed by being thinned extends substantially in parallel in the axial direction between the inner and outer cylinders. A pair of thin rubber walls respectively connected to the tube fitting side, and interposed between the first flange portion and the second flange portion to elastically connect the first and second flange portions. A second rubber elastic body connected to the first rubber elastic body and the second rubber elastic body, and a liquid is formed inside the inner and outer cylindrical fittings formed continuously in the circumferential direction. An annular liquid chamber in which is sealed, and a position near the second flange portion on the inner peripheral surface of the outer cylinder fitting. An annular rubber elastic body operating portion integrally fixed along the circumferential direction to the device and protruding toward the liquid chamber and forming a vibration operating portion with a predetermined gap between the protruding end and the inner surface of the liquid chamber; A liquid-filled type vibration damping device characterized by comprising: