JPH04272536A - Liquid sealing type vibration isolating device - Google Patents

Abstract

PURPOSE:To uniformly seal the space between an outer tube and a tube metal without increasing the number of components of a liquid sealing type vibration isolating device. CONSTITUTION:In a liquid sealing type vibration isolating device which comprises a tube metal 6 affixed to the outer periphery of the end portion of a vibration absorbing rubber material 3 being stuck to the outer periphery of an inner tube and a sealed portion 9 formed by extension of the rubber material 3 onto the outer peripheral face of the tube metal 6 with the tube metal 6 being pressed into an outer tube 2 and with the end portion of the outer tube 2 being calked, an annular protrusion 14 is provided on the outer periphery of the end portion of the tube metal 6 so as to regulate the displacement of the sealed portion 9 due to expansion toward the end portion of the tube metal 6, thus uniformizing sealing forces over the whole peripheral area of the sealed portion 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator used as an engine mount for an automobile, and more particularly to a liquid-filled vibration isolator in which a liquid such as silicone oil is sealed.

0002

2. Description of the Related Art This type of liquid-filled vibration isolator includes the ones shown in FIGS. 5 to 7.

This vibration isolator has a rubber material 3 for vibration absorption interposed between an inner cylinder 1 attached to a vehicle body or the like and an outer cylinder 2 attached to an engine etc. A liquid chamber 5 having an orifice 4 is formed in between, and vibration absorption is prevented by the vibration absorption effect of the rubber material 3 and the damping effect when the liquid in the liquid chamber 5 passes through the orifice 4. I have to. In addition, a tube metal 6 is fixed to the outer periphery of the end of the rubber material 3, and when the tube metal 6 is press-fitted into the outer tube 2 via the seal ring 7 and the end of the outer tube 2 is caulked, The outer tube 2 and the tube metal 6 are integrated, and the liquid sealing chamber 5 is kept sealed. In the case of this vibration isolator, a diaphragm 8 is fixed to the inner circumferential surface of the outer cylinder 2 with a predetermined flexure, and this diaphragm 8 constitutes a part of the liquid chamber 5.

However, in the case of this vibration isolator, the seal ring 7 is interposed between the tube metal 6 and the outer tube 2 when the tube metal 6 is press-fitted into the outer tube 2, so there is a problem that the number of parts increases. There is. For this reason, in the past, as a solution to this problem, a part of the rubber material 3 is extended onto the outer circumferential surface of the cylindrical metal 6 as shown in FIG.
A structure has also been devised in which the seal portion 9 maintains the seal between the barrel metal 6 and the outer barrel 2.

[0005] These similar structures are shown in, for example, Japanese Patent Laid-Open Nos. 62-26830 and 63-199939.

[0006]

[Problems to be Solved by the Invention] The vibration isolator shown in FIG. 8 has the advantage of reducing the number of parts, but on the other hand, the seal portion 9 that is press-fitted into the outer cylinder 2 when caulking the outer cylinder 2 has the advantage of reducing the number of parts.
As shown in FIG. 9, due to a slight misalignment, a portion of the seal portion 9 may be greatly extended and displaced toward the end of the cylindrical metal 6, and the sealing force at that portion may be reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid-filled vibration damping device that can uniformly seal between an outer cylinder and a cylindrical metal without increasing the number of parts.

[0008]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the present invention fixes a tube metal to the outer periphery of the end of a rubber material for vibration absorption fixed to the outer periphery of the inner cylinder, and also fixes the rubber material to the outer periphery of the vibration absorbing rubber material. In a liquid-filled vibration damping device in which a seal portion is formed by extending onto the outer circumferential surface of the cylinder metal, and the cylinder metal is press-fitted into the outer cylinder and the end of the outer cylinder is caulked, the end of the cylinder metal An annular projection is provided on the outer periphery to restrict displacement of the seal portion.

[0009]

[Operation] When the tube metal is press-fitted into the outer tube and the end of the outer tube is caulked, a part of the seal portion tends to stretch toward the end of the tube metal due to misalignment of the seal portion during press-fitting. There is, but
This displacement is regulated by the annular protrusion of the barrel metal.

0010

[Embodiment] Next, an embodiment of the present invention will be described based on FIGS. 1 to 4. Note that the same reference numerals are used for the same parts as those shown in the drawings from FIG. 5 onwards.

In FIGS. 1 to 4, numeral 1 denotes an inner cylinder that is attached to a vehicle body etc. via a rod (not shown), and 2 denotes a bracket 10 (see FIG. 4) that is attached to a mounting member such as an engine.
It is an outer cylinder that can be attached via. A rubber material 3 for vibration absorption is interposed between the inner cylinder 1 and the outer cylinder 2.

The rubber material 3 is vulcanized and bonded to the inner cylinder 1, and a recess 11 constituting a liquid sealing chamber 5 is formed in a part of its outer peripheral surface. A partition plate 12 is provided in the recess 11 to divide the liquid chamber 5 into two upper and lower chambers, and one end of the partition plate 12 is brought into close contact with the inner peripheral surface of the outer cylinder 2. . 13 is a cavity formed in the rubber material 3 along the axial direction.

Reference numeral 6 denotes a cylindrical metal vulcanized and bonded to the outer peripheral surface of the rubber material 3. A part of it is cut out in the shape of a window. Here, a part of the rubber material 3 extends onto the outer circumferential surface of both ends of the tube metal 6 to form a seal portion 9 consisting of a plurality of annular protrusions; An annular projection 14 is formed, and the annular projection 14 prevents the seal portion 9 from being displaced in the extension direction (toward the end of the cylindrical metal 6) due to external force. Furthermore, 1
Reference numeral 5 denotes an orifice groove formed in the center of the barrel 6 along its circumferential surface, and the two upper and lower chambers of the liquid-filled chamber 5 communicate with each other through this orifice groove 15.

The outer cylinder 2 is provided with two openings 16, 16 along its circumferential direction, and these openings 16
, 16 is fixed to the diaphragm 8 so as to close the diaphragm 8. This diaphragm 8 constitutes the liquid sealing chamber 5 together with the recess 11 of the rubber material 3, and in a normal state, the diaphragm 8 is bent in a hemispherical shape toward the inside of the outer cylinder 2 at the openings 16, 16, and vibrates. (The downward displacement of the outer cylinder 2) compresses the lower chamber of the liquid enclosure chamber 5, and the liquid L inside it is compressed.
flows into the upper chamber through the orifice groove 15,
It bulges and deforms in the outward direction (in the direction of the openings 16, 16) to allow an increase in the amount of liquid in the upper chamber. This vibration isolator prevents transmission of vibrations by the vibration absorbing effect of the rubber material 3 and the damping effect when the fluid L passes through the orifice groove 15.

Further, a cylindrical metal 6 is press-fitted into the inside of the outer cylinder 2, and both ends of the cylindrical metal 6 are caulked after this press-fitting. As a result of crimping in this manner, the outer cylinder 2 and the cylindrical metal 6 are integrated with each other, and the sealing portion 9 maintains the sealing of the liquid enclosure chamber 5.

When the end of the outer cylinder 2 is swaged, a part of the seal 9 may locally stretch toward the end of the cylindrical metal 6 due to slight deviation of the seal 9 during press-fitting or variations in the swage force. Although the seal portion 9 may try to displace, since the annular protrusion 14 is formed on the outer periphery of the end of the cylindrical metal 6, local displacement of the seal portion 9 is suppressed. As a result, a substantially uniform sealing force can be obtained over the entire circumference of the seal portion 9.

[0017]

As described above, according to the present invention, an annular protrusion that restricts the displacement of the seal portion is provided on the outer periphery of the end of the barrel, so that the seal portion does not expand locally and displace when the outer cylinder is caulked. This makes it possible to seal uniformly between the outer cylinder and the cylindrical metal without increasing the number of parts.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view corresponding to section A in FIG. 2 showing one embodiment of the present invention.

FIG. 2 is a sectional view of the same embodiment.

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a front view of the same embodiment.

FIG. 5 is a sectional view showing a conventional technique.

FIG. 6 is a sectional view taken along line CC in FIG. 5;

FIG. 7 is an enlarged sectional view corresponding to section D in FIG. 5;

FIG. 8 is an enlarged sectional view of another conventional technique corresponding to section D in FIG. 5;

FIG. 9 is a plan view showing the same technology.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Inner cylinder, 2... Outer cylinder, 3... Rubber material, 6... Cylinder metal, 9... Seal part, 14... Annular protrusion.

Claims (1)

[Claims] Claim 1: A barrel is fixed to the outer periphery of the end of a vibration-absorbing rubber material fixed to the outer periphery of the inner cylinder, and the rubber material is extended onto the outer peripheral surface of the barrel to form a sealing portion. A liquid-filled vibration isolator formed by press-fitting a barrel into an outer cylinder and caulking an end of the outer cylinder, characterized in that an annular protrusion is provided on the outer periphery of the end of the barrel for regulating displacement of the seal portion. A liquid-filled vibration isolator.