JP2839300B2 - How to assemble a liquid-filled bush - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling an anti-vibration bush used for a suspension or an engine mount of an automobile, particularly a liquid-enclosed bush in which a liquid such as silicon oil is enclosed.

2. Description of the Related Art For example, Japanese Patent Application Laid-Open
There is one disclosed in Japanese Patent Publication No. 149442. As shown in FIGS. 7 and 8, a hollow portion 44 is formed inside a vibration-isolating rubber body 43 interposed between an inner cylinder 41 and an outer cylinder 42.
A cavity 46 is filled with a liquid 46 such as silicon oil from an injection hole 45 formed in advance in 42, and the injection hole 45 is closed with a shield type blind rivet 47.

In the conventional structure as described above, since the blind rivet 47 is employed as the closing means of the injection hole 45,
As shown in FIG. 9, not only is it necessary to ensure a sufficient insertion depth of the sleeve 49, which is the rivet body before swaging, combined with the stem 48, but also the protrusion of the sleeve 49 after swaging into the outer cylinder. Since the length is relatively large and the length tends to vary, for example, when a circumferential torsional moment is applied between the outer cylinder 42 and the inner cylinder 41, the resistance plate 50 or the stopper formed integrally with the inner cylinder 41 is formed. There is a possibility that the blind rivet 47 may be damaged due to interference between the 51 and the sleeve 49 of the blind rivet 47. As a result, the installation position of the injection hole 45 and the shape of the resistance plate 50 or the stopper 51 are significantly restricted.

The blind rivet 47 is a swaged sleeve
The sealing property is secured by the press-fitting of the injection hole 49 and the injection hole 45. However, as shown in FIG.
When 52 is generated, the sealing performance is extremely reduced even if the sleeve 49 is swaged. Therefore, in order to prevent the above-described poor sealing performance, deburring must be performed after the processing of the injection hole 45, and the number of processing steps increases.

In addition, a sealant (or sealant) is placed on the crimping part between the injection hole 45 and the blind rivet 47 to improve the sealing performance.
However, it is difficult to use a sealing material together because the final sealing portion between the injection hole 45 and the blind rivet 47 is inside the outer cylinder 42. The problem remains.

The present invention has been made in view of the above-described problems, and has as its object to improve the sealing performance without using a blind rivet that tends to increase the number of steps, and also to restrict the shape of the resistor plate. It is an object of the present invention to provide an assembling method which alleviates the above.

Means for Solving the Problems According to the present invention, as described above, a pair of rubber bodies arranged in the axial direction between the inner cylinder and the outer cylinder is loaded, and the inner and outer cylinders and the pair of rubber bodies are defined. A liquid-filled bush in which a liquid is sealed in the sealed space formed and a resistance plate integrated with the inner cylinder faces the sealed space, and one of the rubber body and the outer cylinder having the auxiliary inner cylinder is formed from the outer cylinder. Separately forming an outer bush assembly including an auxiliary bushing and an inner bush assembly including the other rubber body having an auxiliary outer cylinder and an inner cylinder; and supporting the inner cylinder of the inner bush assembly with the auxiliary bush assembly. Either press-fit slightly into the inner cylinder, or slightly press the outer cylinder of the outer bush assembly into the auxiliary outer cylinder of the inner bush assembly, and then insert the outer bush assembly through the gap between the inner and outer bush assemblies. Fill liquid inside And a step of further press-fitting the liquid-filled outer bush assembly and the inner bush assembly to a predetermined position, reducing the diameter of the outer cylinder, and integrating both the outer and inner bush assemblies. Contains.

According to the above-described method, the liquid is filled in the process of combining the outer bush assembly and the inner bush assembly. Therefore, the liquid-filled bush having the desired structure can be used without filling the liquid later. Is obtained.

Embodiment FIG. 2 is a view showing an example of a liquid-filled bush assembled by the method of the present invention, wherein concentric inner cylinder 1 and outer cylinder 2 are shown.
And the vibration-isolating rubber body 3, 4 along the axial direction
The closed space 5 is defined by the inner and outer cylinders 1 and 2 and the pair of vibration isolating rubber bodies 3 and 4. A resistance plate 6 integrally formed with the inner cylinder 1 faces the sealed space 5, and a liquid 7 such as silicon oil is sealed in the sealed space 5. Reference numeral 8 denotes a core embedded in the resistance plate 6, reference numeral 9 denotes an auxiliary inner cylinder interposed between the inner cylinder 1 and one anti-vibration rubber body 4, and reference numeral 10 denotes an outer cylinder 2 and the other anti-vibration rubber body 3. The auxiliary outer cylinder is interposed between the auxiliary outer cylinder and the auxiliary outer cylinder.

The inner cylinder 1 is integrally formed with a stopper portion whose phase is shifted by 90 degrees with respect to the resistance plate 6 (see FIG. 7), but is not shown in FIG.

The following procedure is used to assemble such a liquid-filled bush.

As shown in FIG. 1 (A), the outer cylinder 2 and the auxiliary inner cylinder 9
And an outer bush assembly 11 in which the one anti-vibration rubber body 4 is vulcanized and bonded, and an inner bush assembly 12 in which the inner cylinder 1 and the auxiliary outer cylinder 10 and the other anti-vibration rubber body 3 are vulcanized and bonded. Are separately formed in advance, and seal members 13 and 14 are integrally formed on the inner periphery of the auxiliary inner cylinder 9 and the outer periphery of the auxiliary outer cylinder 10.

The sealing members 13 and 14 may be integrally formed on the corresponding outer periphery of the inner cylinder 1 and the inner periphery of the outer cylinder 2.

Then, as shown in FIG. 3B, one end of the inner cylinder 1 is slightly pressed into the auxiliary inner cylinder 9 with the out-tub assembly 11 down, and the liquid 7 corresponding to the volume of the sealed space 5 is measured. For example, the outer bush assembly 11 is filled from the gap 15 between the inner and outer bush assemblies 11, 12 by a filling gun or the like. At this time, the primary leakage of the liquid 7 is prevented by the seal member 13.

When the liquid 7 is filled, the inner bush assembly 12 is further press-fitted relatively to the out-to-bush assembly 11, and the outer cylinder 2 is reduced in diameter by a known drawing process. Thereby, both the outer and inner bush assemblies 11, 12 are integrated to ensure the sealing performance between the outer cylinder 2 and the auxiliary outer cylinder 9, and a liquid-filled bush having the structure shown in FIG. 2 is obtained. .

FIG. 1 (C) shows the inner bush assembly 12 of FIG. 1 (B).
FIG. 8 is a view showing another embodiment of the present invention, in which a step portion 1a is provided on the outer periphery of the inner cylinder 1;
Is different. The outer bush assembly 11 and the inner bush assembly are thus formed.
Positioning relative to 12 becomes easy.

Here, the end of the vibration-proof rubber body 3 of the outer cylinder 2 and the end of the auxiliary inner cylinder 9 are caulked (the caulked portion) as shown in FIGS. 3 and 4A and 4B. Sign 1
6, 17, and 18) are more desirable in terms of sealing properties and bonding strength.

FIG. 5 is a view showing another example of the liquid-filled bush assembled by the method of the present invention. This bush
A liquid 26 such as silicon oil is filled in a sealed space 25 defined by the inner cylinders 21 and 22 and a pair of vibration isolating rubbers 23 and 24 mounted between the inner and outer cylinders 21 and 22, A resistance plate 27 integral with the inner cylinder 21 faces the space 25.

The following procedure is used to assemble the fluid-filled bush having such a structure.

As shown in FIG. 6, an outer bush assembly 29 in which the outer cylinder 22 and the auxiliary inner cylinder 28 and one of the vibration isolating rubber members 24 are vulcanized and bonded, the inner cylinder 21 and the auxiliary outer cylinder 30 and the other Vibration rubber body 23
And an inner bushing assembly 31 to which vulcanized adhesive is formed separately in advance, and sealing material members 32 and 33 are previously integrated with the inner periphery of the stepped auxiliary inner cylinder 28 and the outer periphery of the auxiliary outer cylinder 30. In advance.

Then, as shown in the drawing, the auxiliary outer cylinder 30 of the inner bush assembly 31 is slightly press-fitted from one end of the outer cylinder 22 on the outer tub assembly 29 side, and both the inner and outer bush assemblies 29, 31 The liquid 26 corresponding to the volume of the sealed space 25 is filled into the out-to-bush assembly 29 from the gap between the two, more specifically, the gap 34 between the inner cylinder 21 and the auxiliary inner cylinder 28.

After this, the inner and outer bush assemblies 29, 3
1 are press-fitted to a prescribed position, and a portion of the outer cylinder 22 corresponding to the auxiliary outer cylinder 30 is reduced in diameter by drawing to form a shrink portion 36, thereby forming a liquid-filled type having a structure shown in FIG. Get Bush.

According to this structure, the auxiliary inner cylinder 28 has a stepped shape and the seal member 32 is
It is possible to contribute to the improvement of the sealing performance by securing the crushing allowance as large as possible. 4 (A) and FIG. 4 (A).
The same caulking as in (B) may be performed.

Effect of the Invention As described above, according to the present invention, since the liquid is filled in the process of combining the inner bush assembly and the out-to-bush assembly formed separately in advance, the case where the liquid is filled later as in the related art This eliminates the need for a blind rivet or other closing means. As a result, the restriction on the shape of the resistor plate is relaxed, so that a large degree of design freedom can be secured.In addition, the processing of the liquid injection hole and deburring can be abolished. Can contribute.

[Brief description of the drawings]

FIGS. 1A and 1B show an embodiment of the present invention.
FIG. 1 (C) is a cross-sectional view showing another example of the inner bush assembly shown in FIG. 2 (A), and FIG. 2 is the present invention. Sectional views of the liquid-filled bush assembled by the method, FIGS. 3 and 4 (A) and (B) are enlarged views of a main part of FIG. 2, and FIG. 5 is another example of the liquid-filled bush. Cross section shown, sixth
FIG. 7 is an explanatory view of assembling the liquid-filled bush shown in FIG. 5, FIG. 7 is a cross-sectional view showing an example of a conventional liquid-filled bush, and FIG. 8 is a cross-section taken along line VIII-VIII in FIG. FIG. 9 is an explanatory view of the blind rivet shown in FIG. 7 before swaging, and FIG. 10 is an enlarged sectional view of the injection hole in FIG. 1,21… Inner cylinder, 2,22… Outer cylinder, 3,4,23,24 …… Vibration-proof rubber body, 5,25 …… Enclosed space, 6,27 …… Resistance plate, 7,26… … Liquid, 9,30 …… Auxiliary inner cylinder, 10,28 …… Auxiliary outer cylinder, 11,29 ……
Outer bush assembly, 12, 31 ... Inner bush assembly, 15, 34 ... gap.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16F 13/00

Claims (1)

(57) [Claims] 1. A pair of rubber bodies arranged in the axial direction between an inner cylinder and an outer cylinder are loaded, and a liquid is sealed in a sealed space defined by the inner and outer cylinders and the pair of rubber bodies. A liquid-filled bush having a resistance plate integrated with the inner cylinder facing the enclosed space, wherein an outer bush assembly comprising one rubber body having an auxiliary inner cylinder and an outer cylinder; and an auxiliary outer cylinder A step of separately forming in advance an inner bush assembly including the other rubber body having the inner cylinder and the inner cylinder; and slightly press-fitting the inner cylinder of the inner bush assembly into the auxiliary inner cylinder of the outtub assembly, or A step of slightly press-fitting the outer cylinder of the outer tub assembly into the auxiliary outer cylinder of the inner bush assembly, and then filling the inside of the outer tub assembly with a liquid through a gap between the inner and outer bush assemblies; Outer filled with Further press-fitting the bush assembly and the inner bush assembly to a predetermined position, and reducing the diameter of the outer cylinder to integrate both the outer and inner bush assemblies. How to assemble the bush.