JPH06147245A - Vibration isolating rubber - Google Patents

Abstract

PURPOSE:To prevent abrupt fluctuation of spring characteristic, and suppress generation of oscillations and noises. CONSTITUTION:A center stopper 6 made of the same material as that of an elastic rubber body 3 is projected from any one of an inner cylinder 2 and an outer cylinder 1 into any one of cutouts 4, 5 of the rubber body 3. Both side stoppers 7 made of the same material as that of the elastic rubber body 3 are formed such that their heights are lower than that of the center stopper 6 of the rubber body 3. Cutouts 8 are formed between the center stopper 6 and both side stoppers 7 so as to provide them with substantially independent functions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber used for supporting a power source of automobiles and various industrial machines, such as an engine mount, which is elastic between an inner cylinder and an outer cylinder made of a rigid material. The present invention relates to an anti-vibration rubber in which a rubber body is mounted, and two elastic rubber bodies facing each other with an inner cylinder sandwiched are provided with cutouts.

[0002]

2. Description of the Related Art A conventional anti-vibration rubber for an engine mount or the like has an elastic rubber body 102 mounted between an outer cylinder 100 and an inner cylinder 101 as shown in FIG. Notched cavities 103, 1 in two places of the elastic rubber body 102
04 is provided, and the outer cylinder 1 is provided in each of the cutout cavities 103 and 104.
The stoppers 105 and 106 protruding from the 00 side were formed. Then, since the inner cylinder 101 vibrates under the load of lowering it downward, the spring characteristics increase linearly before the elastic rubber body 102 surrounding the inner cylinder 101 hits the lower stopper 106, but After the collision (point C in FIG. 5), the spring characteristics became hard.

[0003]

In the conventional anti-vibration rubber, the notch cavity 104 is closed, that is, the stopper 10 is used.
When the elastic rubber body 102 surrounding the inner cylinder 101 hits 6,
The spring characteristics suddenly became hard (indicated by symbol II in the graph of FIG. 5), and at this time vibration and noise were generated.

Therefore, an object of the present invention is to provide an anti-vibration rubber in which the spring characteristics do not change rapidly and the generation of vibration and noise is suppressed.

[0005]

In order to achieve the above-mentioned object, the present invention uses an elastic rubber body so as to project from at least one of the inner cylinder and the outer cylinder into the notch space. Form a central stopper made of the same material, and form both side stoppers made of the same material on the elastic rubber body so that the protruding height is lower than the central stopper on both sides of the central stopper, and between the central stopper and both side stoppers. The notch is formed so that the two act substantially independently.

[0006]

In the present invention, for example, an engine mount is used,
When a central stopper and both side stoppers are formed in the lower cutout space, an input to push down the inner cylinder works, but at this time, if the elastic rubber body surrounding the inner cylinder does not contact the central stopper, When the input load is moderate, the elastic rubber body surrounding the inner cylinder comes into contact with the central stopper, and the spring characteristics become slightly hard (point A in FIG. 5). When a larger input load is applied, the central stopper is crushed, and at this time, the spring characteristic becomes hard and eventually contacts both stoppers (point B in FIG. 5). The spring characteristic rises smoothly as shown by the symbol I in FIG. 5, and abrupt changes as shown by the symbol II are suppressed. In addition, the presence of the cutout portion also makes the spring characteristic smooth at the initial stage when the elastic rubber body surrounding the inner cylinder contacts the central stopper.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIG. 1, an elastic rubber body 3 is mounted between an inner cylinder 2 and an outer cylinder 1 made of a rigid material,
Notched cavities 4 and 5 are provided at two locations of the elastic rubber body 3 that face each other with the inner cylinder 2 interposed therebetween. In this embodiment, a central stopper 6 made of the same material is formed on the elastic rubber body 3 so as to project from the outer cylinder 1 side in the upper cutout space 4. Both sides of the central stopper 6 are formed with both side stoppers 7 made of the same material in the elastic rubber body 3 so that the protruding height is lower than that of the central stopper 6. A notch 8 is formed between the central stopper 6 and both side stoppers 7 so that they act substantially independently.

FIG. 2 is a sectional view taken along the axial direction in the first embodiment. The engine side is attached to the outer cylinder 1 or the inner cylinder 2, and the vehicle body side is attached to the inner cylinder 2 or the outer cylinder 1. There is.

FIG. 3 is an enlarged cross-sectional view showing the relationship between the central stopper 6, the both side stoppers 7 and the notch portion 8. In order for the central stopper 6 and the both side stoppers 7 to act substantially independently, both are shown. The thickness t of the elastic rubber body 3 connecting the stoppers 6 and 7 does not affect the compression of the central stopper 6 after the collision of the central stopper 6 and the elastic rubber body 3 surrounding the inner cylinder 2. . Specifically, the thickness t of the elastic rubber body 3 at the cutout portion 8 is preferably 3 mm or less. This thickness t is necessary for simultaneously molding the central stopper 6 and both side stoppers 7 when vulcanizing rubber. In addition, the surface of each of the stoppers 7 facing the notch 4 is a flat portion 71, so that when the elastic rubber body 3 surrounding the inner cylinder 2 hits the flat portion 71, a hard spring characteristic can be obtained. it can.

In the second embodiment shown in FIG. 4, the central stopper 6, the both side stoppers 7,
The cutout portion 8 is formed.

In each of the illustrated embodiments, the central stopper 6 and both side stoppers 7 are formed so as to project from the outer cylinder 1 side, but conversely, the central stopper 6 and both sides are projected so as to project from the inner cylinder 2 side. The stopper 7 may be formed.

[0013]

As described above, according to the present invention, the elastic rubber body is made of the same material so as to project from at least one of the inner cylinder and the outer cylinder into the cutout space. A central stopper is formed, and both sides of the central stopper are made of the same material in the elastic rubber body so that the protruding height is lower than that of the central stopper. Since the notch is formed so that it works independently, the elastic rubber body on the side facing the central stopper comes into contact when the input load is moderate, the central stopper is crushed and the spring characteristics become harder, and even larger input When a load is applied, the elastic rubber bodies facing the stoppers on both sides come into contact with each other to exhibit a harder spring characteristic. According to the present invention, as shown by the symbol I in FIG. 5, once rises at the point where it contacts the central stopper (point in FIG. 5A), and then it contacts the stoppers on both sides (FIG. 5B).
It rises again at the point) and the contact point becomes twice, so the spring characteristic rises smoothly. Therefore, the generation of vibration and noise due to the abrupt change of the spring characteristics is suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the axial direction.

FIG. 3 is an enlarged cross-sectional view of a portion of a central stopper and both side stoppers.

FIG. 4 is a sectional view showing a second embodiment.

FIG. 5 is a graph showing the relationship between the load and the deflection of the example of the present invention and the conventional example.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Outer Cylinder 2 Inner Cylinder 3 Elastic Rubber Body 4,5 Notch Void 6 Center Stopper 7 Both Sides Stopper 8 Notch

Claims (1)

[Claims] 1. An anti-vibration rubber in which an elastic rubber body is mounted between an inner cylinder and an outer cylinder made of a rigid material, and two elastic rubber bodies facing each other with the inner cylinder sandwiched are provided with cutout cavities. A central stopper made of the same material is formed on the elastic rubber body so that it projects from either the inner cylinder or the outer cylinder in at least one of the cutout spaces, and it projects from the central stopper on both sides of the central stopper. Both ends of the elastic rubber body were made of the same material so that the height would be low, and a notch was formed between the center stopper and both sides stoppers so that they act substantially independently. Characteristic anti-vibration rubber.