JPH08326811A - Vibration control device - Google Patents

Abstract

PURPOSE: To prevent the early deterioration of vibration control rubber at the time of a vibration generating body being fitted through the vibration control rubber. CONSTITUTION: On end surface parts abutting against the brackets 3, 4 of rubber bodies 6b, 7b, precompression parts 6g, 7g which becomes taller than inside metal fittings 6c, 7c and project on a bracket side and are compressed preliminarily toward the direction of a fitting bracket 1 to which a vibration generating body is fitted in a assembly state, are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for mounting a vibration generator such as an engine in a vibration-proof manner.

[0002]

BACKGROUND OF THE INVENTION Generally,
When installing a vibration generator such as an engine on the body side,
Since it is required to mount in a vibration-proof state, a vibration-proof device using a vibration-proof rubber is known. As such an anti-vibration device, conventionally, as shown in FIG. 4, a fixing bracket 3 integrally provided on the body side, a bolt 5 penetrating the fixing bracket 3, an internal metal fitting 6c through which the bolt 5 penetrates, 7
c and the anti-vibration rubbers 6b and 7 integrally provided on the internal metal fittings 6c and 7c, one end surface of which is in contact with the fixed bracket 3.
b, a receiving bracket 4 with which the other end surface portions of the anti-vibration rubbers 6b and 7b are in contact, and the bolt 5 penetrates, and a nut 8 screwed into the bolt 5 penetrating the receiving bracket 4.
Ring-shaped recessed groove 6 formed on the outer circumference of the anti-vibration rubber 6b, 7b
The external metal fittings 6e and 7e integrally fitted to the d and 7d, and the vibration generator mounting bracket 1 to which the vibration generator is mounted and which is internally fitted to the external metal fittings 6e and 7e, and mounted together with the vibration generator. In some cases, when the bracket vibrates, the vibration is absorbed by the compression of the anti-vibration rubbers 6b and 7b.

However, in absorbing this vibration, the anti-vibration rubbers 6b and 7b receive a compressive load in the direction of the arrow from the vibrating mounting bracket 1 as shown in FIG. If the anti-vibration rubbers 6b and 7b are not pre-compressed in advance, there is a problem that the supporting force of the anti-vibration rubbers 6b and 7b of the mounting bracket 1 is small and stable support is impaired.

Therefore, in order to give a pre-compression to the anti-vibration rubber, as shown in FIG. 6, the distance between both flanges 6f, 7f of the external metal fittings 6e, 7e is set smaller than the thickness of the mounting bracket 1, and the mounting bracket 1 1 to flange 6
Anti-vibration rubber 6b, 7
It is proposed to give b pre-compression. However, this is the direction of pre-compression (direction of arrow C in FIG. 6)
And the direction of the vibration load received from the mounting bracket (the direction of arrow A in FIG. 6) are the same, the load of the vibration isolator in the same direction is large, and the vibration isolation property of the antivibration rubber is impaired at an early stage. There is a problem that the vibration performance deteriorates.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and was devised with the object of providing a vibration damping device capable of solving these problems. When attaching the vibration generator via the anti-vibration rubber, a fixed bracket integrally provided on the body side,
A bolt penetrating the fixing bracket, an internal fitting through which the bolt penetrates, a vibration-proof rubber integrally provided on the internal fitting and having one end surface abutting on the fixing bracket, and the other end surface of the vibration-proof rubber. A receiving bracket that abuts and through which the bolt penetrates, a nut that is screwed into the bolt that penetrates the receiving bracket, and an external metal fitting that is integrally fitted in a ring-shaped groove formed on the outer periphery of the vibration-proof rubber. A vibration body mounting bracket to which a vibration generator is attached and which is fitted to the external metal fitting is provided. At least one end face portion of the vibration damping rubber contacting the fixing bracket or the receiving bracket has a height higher than that of the internal metal fitting. Thus, a preliminary compression portion is formed which projects toward the corresponding bracket side and is pre-compressed in the mounting bracket direction in the assembled state.

According to the present invention, the antivibration rubber is prevented from deteriorating in an early stage.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a mounting bracket integrally provided on the side of a diesel engine (not shown, which corresponds to a vibration generator of the present invention) mounted on a construction machine. Rubber member 2
The diesel engine is attached to the body side in a vibration-proof state by being supported on the body side (vehicle body) via the.

On the other hand, 3 is a fixed bracket integrally provided on the body side to support the mounting bracket 1, and 4 is a receiver provided so as to face the fixed bracket 3 with the anti-vibration rubber member 2 interposed. The brackets 3 and 4 are provided with through holes 3a and 4a through which the bolt 5 penetrates.

The anti-vibration rubber member 2 includes an upper rubber member 6 assembled from above with respect to the mounting hole 1a formed in the mounting bracket 1, and a lower rubber member 7 assembled from below. It is composed of a pair of upper and lower rubber members 6, 7. Further, the rubber members 6 and 7 have inner cylindrical portions 6a and 7a, respectively.
Frustum-shaped rubber bodies 6b, 6b in which are formed and integrally fixed to the inner cylindrical portions 6a, 7a of the rubber bodies 6b, 7b,
Cylindrical internal fittings 6c, 7c through which the bolt 5 penetrates
And a ring-shaped external metal fitting 6 that is integrally fixed to the recessed grooves 6d and 7d formed in the outer peripheral portions of the rubber bodies 6b and 7b on the bottom surface side and that fits into the mounting holes 1a of the mounting bracket 1.
The outer metal fittings 6e and 7e are provided with flange portions 6f and 7f that come into contact with the upper side surface or the lower side surface of the outer peripheral edge portion of the mounting hole 1a.

Then, the mounting bracket 1 is mounted on the upper side by fitting the outer metal fittings 6e and 7e into the mounting holes 1a,
With the lower rubber members 6 and 7 assembled from the upper and lower sides of the mounting hole 1a, the upper end surface portion of the rubber body 6b of the upper rubber member 6 is attached to the fixed bracket 3 and the rubber body 7b of the lower rubber member 7 is attached.
The lower end face portion of the
Then, the bolt 5 is inserted through the through hole 3a of the fixed bracket 3 so as to pass through the inner metal fittings 6c and 7c of the rubber members 6 and 7 and the through hole 4a of the receiving bracket 4, and the nut 8 is attached to the tip of the bolt 5. Although it is configured to be attached to the fixed bracket 3 by tightening with screwing,
An upper end surface portion of the rubber body 6b of the upper rubber member 6 that abuts the fixing bracket 3, and a lower rubber member 7 rubber body 7b.
Preliminary compression portions 6g, 7g, which are taller than the inner metal fittings 6c, 7c and project toward the corresponding brackets 3, 4 respectively, are formed on the lower end surface portion that abuts the receiving bracket 4. The preliminary compression portions 6g and 7g are configured to perform preliminary compression toward the mounting bracket 1 when the nut 8 is tightened.

In the embodiment of the present invention configured as described above, the mounting bracket 1 integrally provided on the diesel engine side, which is the vibration generator, is attached to the fixed bracket 3 on the body side via the vibration-proof rubber member 2. In this case, the rubber members 6b and 7b of the rubber members 6 and 7 constituting the vibration-proof rubber member 2 are attached to the fixed bracket 3 or the receiving bracket 4 at the end face portions thereof. , Preliminary compression portions 6g, 7g that are taller than the inner metal fittings 6c, 7c and project toward the corresponding brackets 3, 4 are formed, and the preliminary compression portions 6g, 7g are attached to the mounting bracket 1. Thus, pre-compression is performed toward the mounting bracket 1 direction.

As a result, the rubber body 6b of the anti-vibration rubber member 2,
7b is to be pre-compressed in a direction (arrow B direction in FIG. 1) opposite to the vibration load direction (arrow A direction in FIG. 1) of the mounting bracket 1 due to the vibration of the diesel engine, and thus the mounting bracket 7b. The vibration of No. 1 can be effectively absorbed, and as in the case where the pre-compression direction and the vibration load direction are the same direction, a large load acts on the rubber bodies 6b and 7b in the same direction, and the vibration resistance of the rubber bodies 6b and 7b is improved. Will not be impaired at an early stage, and good vibration damping performance can be exhibited over a long period of time.

The present invention is not limited to the above-mentioned embodiment, and in addition to the pre-compression portion formed on the end face portion that abuts on the fixed bracket and the receiving bracket of the vibration-proof rubber member, as the pre-compression portion. Then, as in the second embodiment shown in FIG. 3, both flanges 6f, 7f of the outer metal fittings 6e, 7e.
The interval may be set smaller than the thickness of the mounting bracket 1 so that the outer side portions of the flange portions 6f, 7f of the rubber bodies 6b, 7b are also pre-compressed. In this case, precompression is performed in two directions.

[0014]

In summary, since the present invention is constructed as described above, the mounting bracket on the side of the vibration generator is attached to the fixed bracket on the side of the body in a vibration-proof state via the vibration-proof rubber. The anti-vibration rubber has a pre-compression part that is taller than the internal metal fitting and protrudes toward the corresponding bracket on the end face part that comes into contact with the fixed bracket or the receiving bracket. Will be pre-compressed toward the mounting bracket. As a result, the anti-vibration rubber is pre-compressed in the direction opposite to the vibration load direction of the mounting bracket due to the vibration of the vibration generator, so that the vibration of the mounting bracket can be effectively absorbed and the pre-compression can be performed. Direction and vibration load direction are the same direction, a large load in the same direction does not act on the rubber body and the vibration resistance of the rubber body is not impaired in an early period. Therefore, good vibration damping performance can be exhibited.

[Brief description of drawings]

FIG. 1 is a view showing an assembled state of a vibration-proof rubber member.

FIG. 2 is a sectional view of a rubber member.

FIG. 3 is a diagram showing an assembled state of a vibration-proof rubber member in the second embodiment.

FIG. 4 is a diagram showing an assembled state of a vibration-proof rubber member in a conventional example.

FIG. 5 is a sectional view of a rubber member in a conventional example.

FIG. 6 is a diagram showing an assembled state of a vibration-proof rubber member in a proposed example.

[Explanation of symbols]

 1 Mounting Bracket 2 Anti-vibration Rubber Member 3 Fixed Bracket 4 Receiving Bracket 5 Bolt 6 Upper Rubber Member 6b Rubber Body 6c Internal Metal Fitting 6d Recessed Groove 6e External Metal Fitting 6g Pre-compressed Part 7 Lower Rubber Member 7b Rubber Body 7c Internal Metal Fitting 7d Recessed Groove 7e External fitting 7g Pre-compression part 8 Nut

Claims (3)

[Claims] 1. A mounting bracket integrally provided on the body side, a bolt penetrating the fixing bracket, and an internal fitting through which the bolt penetrates when the vibration generator is mounted on the body side via a vibration-proof rubber. An anti-vibration rubber which is provided integrally with the internal metal fitting and has one end surface abutting against the fixed bracket, a receiving bracket with which the other end surface of the anti-vibrating rubber abuts and through which the bolt passes, and a receiving bracket Nuts that are screwed into the bolts, external metal fittings that are integrally fitted inside the ring-shaped groove formed on the outer circumference of the anti-vibration rubber, and vibration generators that are attached to the external metal fittings. At least one end face part that is in contact with the fixed bracket or the receiving bracket of the anti-vibration rubber and is taller than the internal metal fitting and protrudes to the corresponding bracket side. Then, the anti-vibration device is characterized in that a pre-compression portion is pre-compressed in the mounting bracket direction in the assembled state. 2. The vibration damping device according to claim 1, wherein the pre-compression portion is formed on both end portions of the vibration damping rubber. 3. The anti-vibration rubber according to claim 1 or 2,
The anti-vibration device is characterized in that the internal metal fittings and the external metal fittings are divided into two parts in the bolt length direction.