JPH11311280A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve inconvenience caused by vulcanization bonding, prevent a rubber elastic body from being cut, avoid direct contact between an inner cylinder fitting and a bracket fitting and prevent excessive displacement at the time of large input. SOLUTION: In a vibration control device constituted in such a way that a rubber elastic body is fitted to a bracket fitting and that an inner cylinder and a plate fitting are attached to the rubber elastic body, the rubber elastic body 2, the bracket fitting 1, the plate fitting 5 and an inner cylinder fitting are not bonded to one another, but a cylindrical protruding part 21 fitted into a receiving hole 1A of the bracket fitting 1 is formed at the rubber elastic body 2, and a recess is formed at a boundary part of a contact part with the cylindrical protruding part of the rubber elastic body 2 and the surface of the bracket fitting 1. Stoppers 23 swollen outward are formed at the side peripheral surface of the rubber elastic body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical vibration isolator, which is used as a cabin mount for agricultural machines such as tractors, construction machines such as bulldozers, or engine mounts for industrial machines. Related to the device.

[0002]

2. Description of the Related Art As a conventional cylindrical vibration isolator, there is known a vibration isolator in which a rubber-like elastic body 102 is interposed between an inner cylindrical fitting 100 and an outer member 101 as shown in FIG. In this conventional example, the rubber-like elastic body 102 and the inner cylinder 100 are vulcanized and bonded, and the rubber-like elastic body 102 and the outer member 101 are also vulcanized and bonded. A so-called sandwich type vibration damping device in which the bracket 103 is sandwiched between the outer members 101 by using two of those shown in FIG. 8 was configured (see FIG. 9). In FIG. 9, a bolt 104 is inserted into the inner cylindrical fitting 100 from one end side and tightened with a nut 105 at the other end side. Plates 106 are provided between the head of the bolt 104 and one rubber-like elastic body 102 and between the nut 105 and the other rubber-like elastic body 102, respectively. In addition, the inner cylinder fitting 1
No. 00 does not bond with the rubber-like elastic body 102 by vulcanization, but also has the rubber-like elastic body 102 and the outer member 101 vulcanized and bonded, and then inserts the inner cylindrical fitting 100 into the hole of the rubber-like elastic body 102 later. Are known.

[0003] Further, as shown in Fig. 10, a rubber-like elastic body 102 and a metal fitting are not vulcanized and bonded at all, and a metal fitting is assembled to the rubber-like elastic body 102 during assembly. This is such that a metal fitting 107 is sandwiched between two rubber-like elastic bodies 102, a plate 106 is provided on both surfaces of the rubber-like elastic body 102, and a metal fitting 108 is provided on one plate 106 side. Through which bolts 104 are inserted and nuts 105 are tightened.
8 is assembled.

[0004]

When a metal fitting is vulcanized and bonded to a rubber-like elastic body, preparation is required to improve the adhesion of the metal fitting, thereby increasing the product cost and preventing rusting of the metal fitting. There were restrictions on surface treatment. For example, when plating is performed on a metal fitting, the adhesive strength with a rubber-like elastic body may be reduced depending on the type of plating. In addition, since the vulcanization molding dies are also set with metal fittings, the dies themselves become high, and depending on the size, there is a problem that the number of molds that can be formed by one dies is limited and production efficiency deteriorates. Further, in the conventional example in which the metal fitting and the rubber-like elastic body are not vulcanized and bonded, since the rubber-like elastic body comes into direct contact with the corner of the metal fitting, the rubber-like elastic body is cut off at the corner. The body had poor durability. Furthermore, since the inner cylindrical fitting is inserted into the hole of the other fitting, a gap is required between the two fittings, which makes it difficult to position the fittings. There was also the inconvenience of contact.

[0005] Therefore, the present invention eliminates the inconvenience caused by the vulcanization bonding and prevents the rubber-like elastic body from being cut.
It is an object of the present invention to provide an anti-vibration device that avoids direct contact between an inner cylinder fitting and a bracket fitting and prevents an excessive displacement amount at a large input.

[0006]

In order to achieve the above object, the present invention relates to a rubber-like elastic body which comes into contact with a bracket fitting to be attached to one of a vibration source side and a vibration source side. The inner cylindrical fitting is inserted into a through hole formed from one surface of the rubber-like elastic body to the other surface, and a plate fitting having a hole on the other surface of the rubber-like elastic body is brought into contact with the inner cylindrical fitting and the hole of the plate fitting. And a connection fitting to be attached to the other of the vibration source side and the vibration source side is inserted into the receiving hole of the bracket fitting and the rubber-like elastic body is compressed between the bracket fitting and the plate fitting by tightening the connecting fitting. In the vibration device, the rubber-like elastic body and the bracket fitting, the plate fitting, and the inner tubular fitting are not bonded to each other, and the rubber-like elastic body forms a cylindrical protrusion fitted into the receiving hole of the bracket fitting,
A hollow is formed at the boundary between the cylindrical protrusion of the rubber-like elastic body and the part that comes into contact with the surface of the bracket, and the outer side that functions as a stopper on the side peripheral surface of the rubber-like elastic body when a large input action is applied along the axial direction. A stopper portion that bulges out is formed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, one surface of a rubber-like elastic body 2 comes into contact with a bracket 1 attached to the non-vibration source side,
The inner cylindrical fitting 4 is inserted into a through hole 3 formed from one surface of the rubber-like elastic body 2 to the other surface and a receiving hole 1A of the bracket 1. A plate fitting 5 having a hole 5A is provided in contact with the other surface of the rubber-like elastic body 2.

A connection fitting 6 shown in FIG. 2 is inserted into the hole 5A and the inner cylindrical fitting 4, and the rubber fitting 2 can be compressed between the bracket fitting 1 and the plate fitting 5 by tightening the connection fitting 6. It has become. As the connection fitting 6,
A bolt 6A having a head and a bolt 6A
Nut 6B can be suitably used.

In the embodiment shown in FIG. 1, there is shown a so-called sandwich type vibration damping device using two rubber-like elastic members 2 in contact with both surfaces of a bracket 1. Here, the rubber-like elastic body 2, the bracket fitting 1, the plate fitting 5, and the inner cylindrical fitting 4 are not vulcanized and bonded to each other, but are assembled later.

FIG. 3 shows details of the rubber-like elastic body 2. FIG.
In the rubber-like elastic body 2, the receiving hole 1 of the bracket 1
A cylindrical projection 21 that fits into A is formed. Also,
A recess 22 is formed at the boundary between the cylindrical protrusion 21 and the portion that comes into contact with the surface of the bracket 1. further,
A stopper portion 23 that bulges outward and functions as a stopper when a large input action is applied along the axial direction is formed on the side peripheral surface of the rubber-like elastic body 2.

The plate fitting 5 used here has a hole 5
Inclined portion 5B bent from the periphery of the flat plate portion forming A
And a dish-shaped member having a flange portion 5C formed on the tip side of the inclined portion 5B. In FIG. 1, when a large input acts between T and P, the rubber-like elastic body 2 is compressed between the bracket fitting 1 and the plate fitting 5, and at this time, the flange portion 5C
Is prevented from colliding with the stopper portion 23 and the displacement amount becomes excessive. In addition, the cylindrical protrusion 21 has a buffering function when a force in the Q direction in FIG. 1 acts.

In another embodiment shown in FIG. 5, a stopper rubber 7 is provided in contact with the surface of the bracket 1 opposite to the surface with which the rubber-like elastic body 2 comes into contact. A flat plate fitting 5 is provided on the outer surface of each of the rubbers 7 so as to be in contact therewith. In addition, stopper rubber 7
Is formed with a hole 7A, into which one end of the inner tube fitting 4 is inserted. Rubber elastic body 2 used here
As shown in FIG. 6, a cylindrical projection 21 fitted into the receiving hole 1 </ b> A of the bracket 1 is formed, and a recess 22 is formed adjacent to the cylindrical projection 21. A stopper 23 having a height h at both ends is formed on the side peripheral surface of the rubber-like elastic body 2.

As shown in FIG. 7, the stopper rubber 7 protrudes only in the vicinity of its outer peripheral edge so that the contact area with the bracket 1 is reduced. In the example illustrated in FIG.
A ridge portion 7A is formed, and the flat portion 7B on which the ridge portion 7A is formed comes into contact with the bracket 1 under a constant load. That is, the flat portion 7B comes into contact with the bracket 1 when the ridge 7A is crushed. The stopper rubber 7 does not contact the corner of the bracket 1 at which the receiving hole 1A is formed, and the outer peripheral edge of the stopper rubber 7 does not contact the bracket 1. A similar ridge 7D is formed on the surface of the stopper rubber 7 opposite to the ridge 7B, and comes into contact with the plate fitting 5.

[0015]

As described above, according to the present invention, the rubber-like elastic body and the bracket, the plate, and the inner cylinder are not bonded to each other. Can be sufficiently applied. In addition, a cylindrical projection is formed on the rubber-like elastic body so as to fit into the receiving hole of the bracket, and this cylindrical projection is fitted into the receiving hole of the bracket, so that the rubber elastic body can be positioned. As much as possible, a buffering action against a force acting in a direction perpendicular to the axial direction acts. In addition, since a recess is formed at the boundary between the cylindrical protrusion of the rubber-like elastic body and the portion that comes into contact with the surface of the bracket, the rubber-like elastic directly contacts the corner of the bracket, and this corner forms There is no danger of the rubber elastic body being cut. Further, since a stopper portion swelling outward which functions as a stopper at the time of a large input action along the axial direction is formed on a side peripheral surface of the rubber-like elastic body, it is possible to prevent an excessive displacement amount at the time of a large input. Can be. In general, according to the present invention, the cost can be reduced, the durability of the rubber-like elastic body is excellent, and the positioning at the time of assembly becomes easy.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a state in which a connecting fitting is fastened between two plate fittings shown in FIG. 1;

FIG. 3 is a sectional view of a rubber-like elastic body.

FIG. 4 is a sectional view of a plate fitting.

FIG. 5 is a sectional view showing another embodiment.

FIG. 6 is a sectional view of the rubber-like elastic body used in FIG.

FIG. 7 is a sectional view of a stopper rubber.

FIG. 8 is a sectional view showing a conventional example.

FIG. 9 is a cross-sectional view showing a conventional sandwich type vibration damping device using two of those shown in FIG. 8;

FIG. 10 is a sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket fitting 1A Receiving hole 2 Rubber-like elastic body 3 Through-hole 4 Inner cylinder fitting 5 Plate fitting 5A hole 6 Connection fitting 21 Cylindrical protrusion 22 Depression 23 Stopper part

Claims (4)

[Claims] 1. One surface of a rubber-like elastic body comes into contact with a bracket fitting attached to one of a vibration source side and a vibration source side,
The inner cylindrical fitting is inserted into a through hole formed from one surface of the rubber-like elastic body to the other surface, and a plate fitting having a hole on the other surface of the rubber-like elastic body is brought into contact with the inside of the inner cylindrical fitting and the plate fitting. Insert the connecting bracket to be attached to either the vibration source side or the vibration source side into the hole and the receiving hole of the bracket,
In a vibration damping device capable of compressing the rubber-like elastic body between the bracket fitting and the plate fitting by tightening the connecting fitting, the rubber-like elastic body and the bracket fitting, the plate fitting, and the inner cylindrical fitting are not bonded to each other, A rubber projection is formed in the rubber-like elastic body, and a hollow is formed at a boundary between the cylindrical projection of the rubber-like elastic body and a portion that comes into contact with the surface of the bracket. An anti-vibration device, wherein a stopper portion which functions as a stopper when a large input action is applied in the axial direction is formed on a side peripheral surface of an elastic body, and which protrudes outward. 2. The rubber-like elastic body and the plate metal fitting are provided on both sides of a bracket fitting, and one inner cylindrical metal fitting is inserted into a through hole of each rubber-like elastic body. Anti-vibration device. 3. A stopper rubber is brought into contact with a surface of the bracket fitting opposite to the rubber-like elastic body, and one end of the inner cylindrical fitting is inserted into a hole of the stopper rubber. The vibration isolator according to claim 1, wherein a metal fitting similar to the plate metal fitting is provided. 4. The vibration damping device according to claim 3, wherein the stopper rubber comes into contact with the bracket by avoiding a corner portion of the receiving hole forming part and the outer peripheral edge of the stopper rubber is also kept out of contact. .