JP2568970Y2 - External cylinder fixing structure of liquid ring anti-vibration support device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing an outer cylinder of a liquid-sealed anti-vibration support device used for an engine mount of an automobile or the like.

[0002]

2. Description of the Related Art The structure of a liquid chamber in a liquid-sealing and vibration-proof supporting device of this kind is such that a plurality of recessed portions are formed on an outer periphery of a rubber elastic body interposed between an inner cylinder and an outer cylinder. The recess is filled with a liquid to form a liquid chamber, while an outer cylinder is fitted around the outer periphery of the rubber elastic body to make the liquid tight. Accordingly, JP-A-62-22
As disclosed in Japanese Patent No. 4746, there is a risk that the liquid may leak out simply by press-fitting the outer cylinder to the outer periphery of the rubber elastic body and drawing. On the other hand, since the anti-vibration support load is also applied in the axial direction, the outer cylinder may come off from the rubber elastic body only by this fitting method.

For this reason, Japanese Patent Application Laid-Open No. 56-164242 discloses a reinforcing ring provided on the outer periphery of a rubber elastic body (such a reinforcing ring is usually provided to reinforce the rubber elastic body). The O-ring is mounted between the outer cylinder and the outer cylinder to prevent leakage of the liquid, and both ends of the outer cylinder are bent at right angles inward along the side of the rubber elastic body to prevent the liquid from coming off. Are shown.

[0004]

However, such a method increases the material cost because the width of the outer cylinder must be increased by the bending allowance. Further, it is technically very difficult to perform such a bending process without deforming the outer cylinder, and also requires a number of bending steps. The present invention solves such a problem and, in short, prevents liquid tightness and detachment by simply applying a simple operation to the outer cylinder.

[0005]

In order to solve the above-mentioned problems, in the present invention, at least a part of a concave portion which is depressed from the outer periphery is vertically separated, and only the concave portion is cut out near the outer periphery. A cylindrical rubber elastic body enclosing a reinforcing ring is provided, a liquid is sealed in the concave portion, and an outer cylinder is fitted to the outer periphery of the rubber elastic body to make the concave portion a liquid chamber, while each liquid chamber is formed. The liquid seal is characterized in that the outer cylinder is fixed to a rubber elastic body by squeezing in a taper shape so that the diameter is continuously reduced toward both ends of the outer cylinder. The present invention provides an outer cylinder fixing structure of an anti-vibration support device, and in this means, the outer cylinder fixing structure is characterized in that the outer cylinder is squeezed until the outer end of the outer cylinder contacts the outer end of the reinforcing ring.

[0006]

By taking the above measures, the ends of the outer cylinder are tapered so that the diameter decreases continuously toward the end. The rubber elastic body between them is compressed, and has a sufficient effect of preventing detachment and liquid tightness. Also, they do not bend at right angles.
Therefore, processing is easy.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a front view of a liquid-sealed anti-vibration support device.
The liquid ring vibration isolating support device includes an inner cylinder 10, a cylindrical rubber elastic body 12 mounted on the outer periphery of the inner cylinder 10, and a rubber elastic body 1.
And an outer cylinder 14 fitted on the outer periphery of the outer cylinder 2. This embodiment shows an engine mount in which the inner cylinder 10 is fixed to a chassis-side member and the outer cylinder 14 is fixed to an engine-side member. In order to support the weight of the engine, the outer cylinder 14 has a load direction ( In FIG. 3, the eccentricity is preliminarily eccentric to the upper side.

FIG. 1 is a partial longitudinal sectional view of a liquid-sealed vibration isolating support device,
Although FIG. 2 is a cross-sectional view, the rubber elastic body 12, the inner cylinder 1
At least with both ends in the axial direction of 0
Recess 1 a part thereof depressed toward the center from the outer periphery
6, 18 are vertically spaced. The rubber elastic body 12
The upper part of the inner cylinder 10 is formed with a penetrating part 20 penetrating in the axial direction for the purpose of softening the rubber, and the upper concave part 16 is formed by the outer cylinder 14 having the outer periphery of the rubber elastic body 12. , The inner periphery of which is recessed to the left and right of the overhanging portion 22 formed so that the inside of the through portion 20 projects toward the inner cylinder 10 to the extent that the bottom portion maintains a constant thickness with the through portion 20. Formed
Have been. This thickness is set relatively thin, and the recess 16
Has a diaphragm structure in order to increase the amount of liquid movement, and hangs down in the through portion 20. Therefore, it can be said that the upper concave portion 16 is divided into two right and left portions with the overhang portion 22 as a boundary. However, a passage 24 is formed around the outer periphery of the overhang portion 22 in the axial direction , and the two recessed portions 16 communicate with each other.

The lower recess 18 is formed by recessing the rubber elastic body 12 below the inner cylinder 10 to such an extent that the rubber elastic body 12 keeps a considerable thickness, and the top (the lowermost portion in FIG. 2). 3) is provided with a bridging portion 26 that bridges the wall surfaces that constitute the front and rear walls of the recess 18 in the axial direction . Further, a reinforcing ring 28 obtained by cutting out the two recessed portions 16 and 18 into a window shape is embedded and reinforced near the outer periphery of the rubber elastic body 12. FIG. 4 is a partial cross-sectional side view of this reinforcing ring 28. The window-shaped cutout is formed by a central recess 16,
18 and both end portions are cylindrical portions 40 in which meat is present as a whole. Further, both sides of the cylindrical portion are formed with a step to increase the diameter.

When the rubber elastic body 12 described above is immersed in a liquid and the outer cylinder 14 is fitted therein, the two concave portions 16 and 18 are formed into liquid chambers 16 and 18 in which the liquid is sealed. The liquid chambers 16 and 18 are communicated by an orifice structure 30 described below. That is, the passage groove 32 is formed in the cylindrical portion of the rubber elastic body 12 constituting the wall of the liquid chambers 16 and 18, and both ends of the passage groove 32 are communicated with the respective liquid chambers 16 and 18. (This passage groove 32 is also filled with liquid).
By the way, in this case, the reinforcing ring 28 is provided under the passage groove 32.
So that the cylindrical portion 40 is located.
And the outer cylinder 14 to ensure sufficient liquid tightness. still,
At the entrance of the passage groove 32, a portion communicating with the lower liquid chamber 18 is set near the bridging portion 26, and a portion communicating with the upper liquid chamber 16 extends to a far side beyond the overhang portion 22. It is desirable to extend the entire length of the rubber elastic body 12 so as to go around at least a half circumference. Further, the passage groove 32 is formed in one or both of the front and rear cylindrical portions of the liquid chambers 16 and 18, and the latter case has a larger flow amount of the liquid.

FIG. 5 is a cross-sectional view of a main part of the outer peripheral portion of the rubber elastic body 12. The cylindrical portion constituting the front and rear walls of the liquid chambers 16 and 18 of the rubber elastic body 12 and the opposite side of the passage groove 32. One or several sealing lips 34 formed in a strip shape are formed in a ring shape with the partially cut cylindrical portion of the outer cylinder 14.
Is a liquid-tight member for fitting. This allows O
Nothing like a ring is needed.

As described above, when the inner cylinder 10 is fixed to the chassis side member and the engine is mounted on the outer cylinder 12, the vibration of the engine is attenuated and cut off and transmitted to the chassis. In addition, a stopper structure is provided to restrict excessive displacement when it occurs. That is, in the lower liquid chamber 18, the rubber elastic body 12
(The rigidity is increased by enclosing a metal core 38 that extends from the inner cylinder 10 at this time.) When the stopper body 36 hits the bridging portion 26, the excessive displacement is regulated by the projecting portion 22 hitting the inner cylinder 10 with respect to the downward displacement.

By the way, according to the present invention, when the outer cylinder 14 is fitted to the rubber elastic body 12, the diameter of the outer cylinder 14 increases as the both ends approach the ends.
Is reduced in a taper shape so that the diameter of the reinforcing ring 28 is continuously reduced. The degree of contact is sufficient, so that the rubber elastic body 12 and the outer cylinder 14 are fixed very firmly. Specifically, the outer cylinder 14 has a diameter of 90 mm and an end portion of 4 m.
It is sufficient to reduce the diameter by about 1 to 2 mm over about m.
In this case, there is an advantage that the liquid-tight effect of the orifice structure 30 is improved.

When the force required for disengagement in the above example was measured, it was found to be 800 to 1500 kg, which is a value that can withstand practical use. Incidentally, when the outer cylinder 14 was straight, the weight was 100 to 200 kg, and the strength was not enough with this. When the outer cylinder 14 was bent at a right angle, it was 1500 to 2500 kg, and the strength was unnecessarily high.

[0015]

As described above, according to the present invention, when the outer cylinder is fitted to the outer periphery of the rubber elastic body, the diameter increases as the both ends approach the end.
Only by squeezing it to decrease continuously, it was possible to achieve a practically durable prevention of detachment and a liquid-tight effect. Therefore, the cost was significantly reduced in terms of material cost, easiness of processing, and reduction of man-hours .

[Brief description of the drawings]

FIG. 1 is a partial vertical cross-sectional view of a liquid-sealed anti-vibration support device.

FIG. 2 is a cross-sectional view of the liquid-sealed vibration isolating support device.

FIG. 3 is a front view of the liquid-sealed anti-vibration support device.

FIG. 4 is a partial cross-sectional side view of a reinforcing ring.

FIG. 5 is a sectional view of a main part of a rubber elastic body.

[Explanation of symbols]

 Reference Signs List 10 inner cylinder 12 rubber elastic body 14 outer cylinder 16 liquid chamber 18 liquid chamber 28 reinforcing ring 30 orifice structure

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-98718 (JP, A) JP-A-1-182645 (JP, A) JP-A-62-184249 (JP, A) JP-A-62-184249 JP-A-56-164242 (JP, A) JP-A-2-124338 (JP, U) JP-A-2-432338 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A cylindrical rubber elastic body in which at least a part of a concave portion which is recessed at least partly from the outer periphery is vertically provided at an outer periphery of an inner cylinder, and a reinforcing ring in which only the recessed portion is cut out near the outer periphery is enclosed. The body is mounted, the liquid is sealed in the concave portion, and the outer cylinder is fitted around the rubber elastic body to make the concave portion a liquid chamber, while each liquid chamber communicates with an orifice structure. In the support device, the diameter increases as both ends of the outer cylinder move toward the ends.
An outer cylinder fixing structure for a liquid-sealed vibration isolating support device, wherein the outer cylinder is fixed to a rubber elastic body by squeezing the taper shape so as to decrease continuously . 2. The outer cylinder fixing structure according to claim 1, wherein the outer cylinder is squeezed until the outer end of the outer cylinder contacts the outer end of the reinforcing ring.