JPH04302736A - Liquid sealing type vibration isolation device - Google Patents

Abstract

PURPOSE:To obtain an excellent vibration attenuating property by cutting off a burr of an elastic body so as to prevent a generation of flowing resistance of a liquid passing through an orifice. CONSTITUTION:While an elastic body 4 furnishing a recess 5 at the upper end 4a is provided on the outer peripheral surface of an inner tube 3 surrounded by an outer tube 1 in a concentrical condition, a partition plate 10 to partition the above recess 5 into a main liquid chamber 8 and a sub-liquid chamber 9 is provided, and furthermore, a hard quality of circular arc form installing member 21 furnishing an orifice 11 to replace and let flow the operating liquid in the main and the sub-liquid chambers 8 and 9 at the periphery is provided. And furthermore, cutters 23 and 23 at both ends 22a and 22b of the main body 22 of the installing member 21 have been extended in the direction of the upper end 4a of the elastic body 4 positioned higher than the outer end edges 4d and 4e of the connection of the elastic body 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled vibration damping device used, for example, to support an automobile engine or the like on a vehicle body.

0002

BACKGROUND OF THE INVENTION As a conventional cylindrical liquid-filled vibration damping device of this kind, the one shown in FIGS. 6 and 7 is known, for example (see Japanese Patent Laid-Open No. 1-182645, etc.).
.

To explain the outline, in the figure, 1 is an outer cylinder connected to a vehicle body etc. via a bracket 2 on the outer periphery, and 3 is the outer cylinder 1.
The outer cylinder 1 has openings 1a and 1b formed on both sides of its upper end. A substantially annular elastic body 4 for vibration absorption is vulcanized and bonded to the outer periphery of the inner cylinder 3. The elastic body 4 is molded in the upper and lower molds in the form of a semicircular upper end 4a and a lower end 4b connected to each other during vulcanization molding. In addition, this elastic body 4
A recess 5 is formed in the upper end 4a, and a metal annular support member 6 is fixed to the outer periphery. This support member 6 has an arcuate intermediate fitting 6a bonded to the outer peripheral surface of the lower end portion 4b of the elastic body 4.

[0004] Furthermore, the diaphragm 7 is provided between the outer cylinder 1 and the support member 6 and extends approximately along the inner peripheral surface of the outer cylinder 1. It is filled with a working fluid such as silicone oil. Further, between the diaphragm 7 and the recess 5, there is a half-moon-shaped partition plate 10 with a substantially U-shaped cross section that separates the inside of the recess 5 into an inner main liquid chamber 8 and an outer sub-liquid chamber 9. It is provided.

[0005] Also, on the outer peripheral surface of the intermediate metal fitting 6a, an arc-shaped rubber member 4 is vulcanized and molded together with the elastic body 4.
An orifice 11 is formed on the outer peripheral surface of the rubber member 4c, which communicates one end of the main liquid chamber 8 with one end of the auxiliary liquid chamber 9 on the opposite side. Furthermore, the recess 5
Between the side diaphragm 7 and the bracket 2, there is a crescent-shaped atmospheric chamber 12 that allows the diaphragm 7 to be flexibly deformed.
is provided.

When the inner cylinder 3 vibrates due to engine vibration and the elastic body 4 is displaced upward in the figure, the main liquid chamber 8 is compressed. Therefore, the working liquid in the main liquid chamber 8 flows into the sub-liquid chamber 9 through the orifice 11 as shown by the arrow, and the internal pressure of the sub-liquid chamber 9 increases, causing the diaphragm 7 to be pushed by its own spring force. It is deflected and deformed in the atmospheric chamber 12 against the force. Conversely, when the elastic body 4 is displaced downward, the fluid pressure in the main fluid chamber 8 decreases, and the spring force of the diaphragm 7 in turn causes the fluid pressure in the auxiliary fluid chamber 9 to decrease.
The liquid flows from the liquid through the orifice 11 into the main liquid chamber 8 .

[0007] In this way, the transmission of engine vibrations to the vehicle body is effectively suppressed by the vibration absorption effect of the elastic body 4 and the damping effect when the working fluid passes through the orifice 11.

In the figure, reference numerals 13 and 14 indicate ventilation holes that communicate the atmospheric chamber 12 with the outside, and reference numeral 15 indicates a cavity formed between the lower end 4b of the elastic body 4 and the intermediate fitting 6a.

[0009]

[Problems to be Solved by the Invention] However, in the conventional liquid-filled vibration isolating device, as described above, the elastic body 4
During vulcanization molding, the upper end 4a and the lower end 4b are integrally molded using a mold, so that the outer edges 4d and 4e of the connecting portion of both 4a and 4b are So-called burrs 16 and 17 are likely to occur on the parting line X. For this reason, both the burrs 16 and 17 are connected to both ends 11 of the orifice 11 that communicate with the main liquid chamber 8 and the auxiliary liquid chamber 9.
There is a possibility that a, 11b may be partially blocked. Therefore, a relatively large flow resistance is generated in the liquid flowing through the orifice 11, and smooth displacement flow between the main liquid chamber 8 and the sub-liquid chamber 9 is inhibited. As a result, as described above, the damping effect that occurs when the liquid passes through the orifice 11 deteriorates, making it impossible to obtain a sufficient vibration suppressing effect.

0010

[Means for Solving the Problems] The present invention has been devised in view of the above-mentioned problems of the conventional art. an annular elastic body, a diaphragm interposed between the outer tube and the elastic body and sealing a liquid therein, and a partition plate that separates the inside of the recess into a main liquid chamber and a sub-liquid chamber. , a hard circular arc-shaped fitting member that is fitted to the other end of the elastic body and forms an orifice on the outer peripheral surface for displacing and flowing the liquid into the main liquid chamber and the sub-liquid chamber; It is characterized in that both end portions of the attachment member extend toward one end from the outer edge of the connecting portion of both ends of the elastic body connected during molding.

[0011]

[Operation] According to the present invention having the above structure, even if burrs are generated on both ends of the connecting portion of the elastic body during vulcanization molding, when the fitting member is fitted to the other end of the elastic body, the burrs are removed. Either the burr is cut off at both ends of the fitting member, or after fitting is completed, the burr is covered with both ends to prevent it from protruding into the orifice. This can be reliably prevented from occurring.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. Incidentally, the same reference numerals are given to the constituent parts common to the conventional one, and a redundant explanation will be omitted.

FIG. 1 is a sectional view showing an embodiment of a liquid-filled vibration isolator according to the present invention, in which 1 is an outer cylinder having a bracket 2 fixed to its outer periphery, and 3 is an eccentric part of the outer cylinder 1. 4 is a substantially annular elastic body which is fixed to the outer periphery of the inner cylinder 3 and connects the upper end 4a and the lower end 4b during vulcanization molding; 5 is the upper surface of the upper end 4a; 6 is an annular support member; 7 is a diaphragm; 10 is a partition plate that separates the inside of the recess 5 into a main liquid chamber 8 and a sub-liquid chamber 9; 6a constitutes a part of the support member 6; It is an intermediate metal fitting. This intermediate metal fitting 6a is integrally embedded during vulcanization molding of the elastic body 4, and its both ends 6b, 6c are connected to the upper and lower ends 4a, 4b of the elastic body 4, both outer edges 4d, It extends further toward the upper end portion 4a than 4e, but enters into the elastic body 4. Therefore, as shown in FIGS. 2 and 3, thin burrs 16 and 17 are formed on the outer edges 4d and 4e of the elastic body near the outer surfaces of the ends 6b and 6c.

[0014] An arc-shaped fitting member 21 made of a synthetic resin material is fitted onto the outer peripheral surface of the intermediate fitting 6a exposed from the elastic body 4. This fitting member 21 is shown in FIG.
- As shown in FIG. 4, this is a rubber member 4c of the elastic body 4 in the conventional art and is provided separately from the elastic body 4, and is provided in parallel with the intermediate fitting 6a and both ends of the elastic body 4. The support member 6 is fitted into an arcuate groove 20 formed between the support members 6, 6.

More specifically, this fitting member 21 includes an arcuate main body 22 and both end portions 22a, 2 of the main body 22.
It consists of cutter parts 23, 23 integrally provided at the center of the main body 22 and an orifice groove 24 continuously formed on the outer peripheral surfaces of the main body 22 and the cutter parts 23, 23. The main body 22 has an arc length L1 equal to the length of the arc groove 20, that is, the arc length between the left and right pairs of protrusions 25, 25, 26, and 26 integrally formed directly above the outer edges 4d and 4e of the elastic body. It is set slightly smaller than that, and its width L2
is set to be slightly smaller than the width between the support members 6, 6, and the wall thickness L3 is approximately equal to the depth of the arcuate groove 20, that is, the depth from approximately the surface of the intermediate metal fitting 6a to the outer peripheral edge of each support member 6, 6. is set to be the same as Therefore, the arc groove 20
When fitting into the
6, 26 and the outer circumferential surfaces of the supporting members 6, 6. Also, both ends 22a of the main body 22
, 22b are elastically deformed inwardly before being fitted into the arcuate groove 20.

As shown in FIG. 5, the cutter portions 23, 23 are formed to protrude from both ends 22a, 22b of the main body 22, and have a chisel blade shape, and the amount of protrusion L4 is larger than the two outer edges 4.
d, 4e toward the upper end portion 4a of the elastic body, and its width L5 is set to be about 1 cm from each of the projections 2a.
The width is set to be slightly smaller than the width between 5, 25, 26, and 26.

The orifice groove 24 is connected to the diaphragm 7.
The orifice 11 is formed between the main and
The portions other than both end portions 24a and 24b near the sub-liquid chambers 8 and 9 are formed in a meandering shape, and the both end portions 24a and 24b are formed in a wide straight line.

The operation of this embodiment will be explained below. First, the supporting members 6, 6 including the inner cylinder 3, the elastic body 4, and the intermediate fitting 6a are vulcanized and bonded to each other in a mold in advance to form one part A, as shown in FIG. Next, in a liquid such as silicone oil, the partition plate 10 is assembled into the recess 5 of the elastic body 4, and at the same time, the fitting member 21 is fitted into the circular arc groove 20 by being pushed from below. Furthermore, each component such as the diaphragm 7 and the outer cylinder 1 is positioned from the outside of this assembly and assembled using a predetermined jig.
Further, by squeezing the outer peripheral surface of the outer cylinder 1 with a squeezing jig, a liquid-filled vibration isolator as shown in FIG. 1 is completed.

In order to fit the fitting member 21 into the A part, first, as shown in FIG.
2a, 22b and the inner surfaces of the cutter parts 23, 23 are fitted into both ends of the arcuate groove 20 from below, and the main body 22 is
is pushed up from below against the elastic reaction forces of both ends 22a and 22b. Then, the cutting edges 23a of the cutter parts 23, 23
, 23a are fitted between the protrusions 25, 25, 26, 26 while slidingly contacting the outer surface of the intermediate fitting 6a with a predetermined relatively strong pressure, the burrs 16, 1 formed on the outer edges 4d, 4e
Cut 7 from the root. Then, when the main body 22 is further pushed upward and completely fitted into the arcuate groove 20, the cutter parts 23, 23 go over both outer edges 4d, 4e and cover the outer edges 4d, 4e. Fit into place. Therefore, most of the burrs 16 and 17 are in the cutter parts 23 and 23.
However, even if a portion remains, it will be covered by the cutter portions 23, 23, and will not be exposed inside the orifice 11. Therefore, it is possible to reliably prevent the occurrence of liquid flow resistance due to 16 and 17 within the orifice 11, and a smooth displacement flow of liquid between the main liquid chamber 8 and the sub-liquid chamber 9 can be obtained at all times due to vibrations. .

Furthermore, in this embodiment, since the orifice 11 is formed in a meandering shape, a sufficient orifice length is ensured.
Good damping characteristics can be obtained.

The present invention is not limited to the configuration of the above-mentioned embodiments. For example, the entire fitting member 21 can be made of a lightweight metal material, and the main body 22 can be made of a synthetic resin material, and the cutter parts 23, It is also possible to form 23 from a metal material. By doing this, the burrs caused by the cutter parts 23, 23
The resection work of 6 and 17 becomes even better.

[0022]

As is clear from the above description, according to the present invention, burrs generated on the outer edge of the connecting portion of both ends of the elastic body during molding of the elastic body can be effectively removed by the both ends of the fitting member. Furthermore, even if the burr remains, it will be covered by both ends of the fitting member, thereby reliably preventing flow resistance of the working fluid due to burrs within the orifice. As a result, a smooth displacement flow of the liquid between the main liquid chamber and the sub-liquid chamber can be obtained at all times, and excellent vibration damping characteristics can be obtained due to passage through the orifice.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of the main components of this embodiment.

FIG. 3 is a sectional view taken in the direction of arrow B in FIG. 2;

FIG. 4 is a perspective view showing a state in which the fitting member used in this embodiment is fitted to part A.

FIG. 5 is an enlarged view of the main parts of the fitting member.

FIG. 6 is a cross-sectional view showing a conventional vibration isolator.

FIG. 7 is a sectional view taken along line CC in FIG. 6;

[Explanation of symbols]

1...Outer cylinder, 3...Inner cylinder, 4...Elastic body, 4a...Upper end, 4b
...lower end, 4d, 4e...outer edge of connecting portion, 5...recess, 7...
Diaphragm, 8... Main liquid chamber, 9... Sub-liquid chamber, 10... Partition plate, 11... Orifice, 16, 17... Burr, 21... Fitting member, 23... Cutter part.

Claims (1)

[Claims] 1. A substantially annular elastic body fixed to the outer peripheral surface of an inner cylinder surrounded by an outer cylinder and having a concave portion at one end; a diaphragm filled with liquid; a partition plate that separates the inside of the recess into a main liquid chamber and a sub-liquid chamber; and a hard arc-shaped fitting member constituting an orifice for displacing fluid into the sub-liquid chamber, and connecting both ends of the fitting member to the outer edge of the connecting portion of both ends of the elastic body connected during molding. A liquid-filled vibration isolator characterized by extending toward one end of the device.