JPS6337543Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a vibration-isolating mount used for mounting an automobile engine to a vehicle body in a vibration-isolating manner.

When supporting an engine installed in a car in a vibration-proof manner, since the rotation speed of the engine itself is wide, the damping coefficient for large-amplitude low-frequency vibrations that occur at low speeds is large, and Of course, a vibration-proof mount that can satisfy the two requirements of high vibration isolation against high-frequency vibrations is required, but vibration-proof mounts that use rubber or air springs, which are highly damping materials, are Increasing the damping function against low frequency vibrations increases the dynamic spring characteristics against high frequency vibrations.
On the other hand, if the dynamic spring characteristics are improved against high-frequency vibrations, the damping function against low-frequency vibrations cannot be demonstrated, and this has the disadvantage that effective vibration-proofing performance cannot be maintained against vibrations over a wide range. .

In order to eliminate these drawbacks, much research and development has been carried out on anti-vibration mounts that exhibit fairly good anti-vibration characteristics for both high- and low-frequency vibrations, and various types of anti-vibration mounts have been proposed. However, among various vibration isolating mounts, the present invention is a liquid damping mount in which the vibration damping function is carried out by the enclosed liquid, while the vibration insulating function is carried out by a rubber layer. This anti-vibration mount belongs to the anti-vibration mount, and has a new structure that can more effectively suppress vibrations caused by high-speed engine rotation, and special noises that occur during startup, acceleration, and deceleration. The present invention has been devised to provide this.

Therefore, the present invention encapsulates the structure of the chamber volume change part related to the orifice member for liquid flow, which is a member that exhibits damping performance against low-frequency vibrations particularly during low-speed operation, and also encapsulates the structure of the chamber volume change part related to the orifice member for liquid flow, which is a member that exhibits damping performance against low-frequency vibrations particularly during low-speed operation. By confining it in the enclosure, it is possible to make it more compact and robust, and by installing a mass damper, it is excellent against muffled sound in the intermediate frequency range and transmitted sound in the high frequency range. The upper metal fitting, the lower metal fitting, and the upper metal fitting were interposed between the two metal fittings, and the upper part was airtightly connected to the upper metal fitting and the lower part to the lower metal fitting. Consisting of a rubber cylindrical body, a ring-shaped mass damper airtightly interposed in the middle part of the cylinder body of the rubber cylindrical body, and a capsule housed in a closed space surrounded by them, This capsule has a double-chamber structure in which a sealed bag whose volume can be varied by expansion and contraction and which can be communicated with the surrounding sealed space through an orifice member is housed in a rigid case, and the sealed space and the sealed bag are connected to each other. It is characterized by being filled with liquid.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The figure is a schematic structural diagram of an example of the vibration-proof mount of the present invention, which includes an upper metal fitting 1 for fixing to the body of an automobile engine, a lower fitting 2 for fixing to the automobile body, a rubber cylindrical body 3, and a housing. It includes a member 4, a capsule 5, and a mass damper 9 as constituent members.

The rubber cylindrical body 3 is in the shape of a pot with an open bottom, and its top is integrally fixed to the upper metal fitting 1, and its bottom periphery is integrally fixed to a housing member 4 having an annular shape.

The mass damper 9 has a ring shape, and is airtightly integrated with the middle portion of the barrel of the rubber cylindrical body 3, and is interposed in a transverse manner.

The connections made between the upper metal fitting 1 and the rubber cylindrical body 3, the housing member 4 and the rubber cylindrical body 3, and the mass damper 9 and the rubber cylindrical body 3 are completely liquid-tight and are protected against external mechanical forces. It must have sufficient durability, and for that purpose, vulcanization adhesion is a suitable treatment means.

On the other hand, the housing member 4 serves as a reinforcing member for the rubber cylindrical body 3, and also functions as a support base material for the rubber cylindrical body 3 by being closely integrated with the lower metal fitting 2.

In this way, by integrating the lower metal fitting 2 and the housing member 4 in a fluid-tight manner, both metal fittings 1,
2. A liquid-tight sealed space is formed surrounded by the rubber cylindrical body 3, the mass damper 9, and the housing member 4, and this sealed space is filled with a liquid 10 such as water.

Next, the capsule 5 consists of a double-walled sealed bag 7 made of an elastic material such as rubber and whose volume can be varied by expansion and contraction, housed in a liquid-tight rigid case 6 made of a rigid plate material such as hard synthetic resin or metal. It has a chamber structure, and the inside of the sealed bag 7 is communicated with the sealed space outside the rigid case 6 via an orifice member 8, for example, a thin tube, which is provided to penetrate the rigid case 6 in a liquid-tight manner.

The space existing between the rigid case 6 and the sealed bag 7 of the capsule 5 has an appropriate volume corresponding to the volume of the sealed space filled with the liquid 10, and has a pressure equal to or higher than atmospheric pressure. It encloses air.

The capsule 5 is then allowed to float in the liquid within the sealed space or is attached to one location of the rubber cylindrical body 3 (not shown).

The anti-vibration mount having the above structure has an outer portion made up of sturdy members including an upper metal fitting 1, a lower metal fitting 2, a housing member 4, and a mass damper 9, and a strong rubber cylindrical body 3 made of thick rubber. Since it is surrounded, it has great mechanical strength.

In a state in which the engine is supported, the sealed bag 7 maintains its regular shape in a state where the pressure applied to the sealed space and the pressure of the sealed air portion of the capsule 5 are balanced.

When the engine is running and vibrates, the rubber cylindrical body 3
When subjected to dynamic compression, it exhibits dynamic spring characteristics and functions as a vibration damper.

At this time, the volume of the liquid 10 filling portion inside the rubber cylindrical body 3 changes due to the convexity of the rubber cylindrical body 3.
0 moves in and out of the sealed bag 7 via the orifice member 8.

Therefore, the squeezing effect of the liquid passing through the orifice member 8 provides a high damping ability against vibrations.

On the other hand, the mass damper 9 interposed in the middle part of the rubber cylindrical body 3 has a damper function with respect to vibration propagation in the compression direction to the rubber cylindrical body 3, and also has a damper function with respect to vibrations in the shear direction. It has the function of keeping a large constant.

Therefore, setting the resonance frequency of the mass damper 9 to, for example, 350Hz for vibrations in the rubber compression direction, and 150Hz for vibrations in the shearing direction, reduces the weight, diameter, and thickness of the mass damper 9. This is possible by making appropriate selections, and thus exhibits an absorption function for the engine transmitted sound of around 300 to 600 Hz, which is likely to occur during acceleration and deceleration, and plays a major role in making the interior of the car quieter. It is.

By the way, if the above anti-vibration mount is used,
Even if the sealed bag 7 is damaged, the air sealed between the sealed bag 7 and the rigid case 6 will simply move within the rubber cylindrical body 3, and the liquid 10 will leak out of the device. Such inconveniences do not occur at all, and although the damping ability against vibrations is unavoidably reduced in such a situation, the ability to carry heavy objects can be maintained.

Next, the unique effects of the present invention are listed below.

(a) When the rubber cylindrical body 3 is subjected to dynamic compressive bending, it exhibits dynamic spring characteristics which are effective in damping vibrations, while the throttling effect of the liquid passing through the orifice member 8 further exhibits high damping capacity against vibrations.

Furthermore, mass damper 9 is applied to the intermediate frequency range (100
~150Hz) muffled sound and high frequency range (300~
500Hz) has a damping effect on transmitted sound.

Therefore, the functions of these three members work together to fully exhibit the vibration isolation function.

(b) Both the upper and lower fittings 1 are encapsulated with a structure that has a damping function against vibrations, especially low-frequency vibrations.
2. Since the rubber cylinder 3 and the mass damper 9 are immersed in a liquid and sealed inside a strong and strong structure, a device that is strong against external forces and has a long life can be obtained.

(c) Compared to the conventional vibration-proof mount of this type, which forms two upper and lower chambers with a partition in order to allow the fluid to flow through the constrictor, the height dimension is lower and the same effect is achieved. It can have a compact structure.

(d) Even if the sealed bag 7 of the capsule 5 were to be damaged during use, the damping function would only be reduced and the liquid 10 would not leak at all, so the high weight carrying capacity could still be ensured, and the conventional It is more reliable than conventional devices that tend to leak and require frequent replacement.

As described above, the present invention is a vibration-proof mount with liquid damping for engines, which has great utility value.

[Brief explanation of the drawing]

The figure is a cross-sectional front view of one example of the vibration-proof mount of the present invention. 1... Upper metal fitting, 2... Lower metal fitting, 3... Rubber cylindrical body, 5... Capsule, 6... Rigid case, 7...
Sealed bag, 8...orifice member, 9...mass damper.

Claims (1)

[Scope of utility model registration request] Upper metal fitting 1, lower metal fitting 2, and both metal fittings 1 and 2
A rubber cylindrical body 3 is interposed between the rubber cylindrical body 3 and the upper part is hermetically connected to the upper metal fitting 1 and the lower part is hermetically connected to the lower metal fitting 2. A ring-shaped mass damper 9 and a capsule 5 housed in a closed space surrounded by the ring-shaped mass damper 9.
The capsule 5 has a double-chamber structure in which a sealed bag 7 whose volume can be varied by expansion and contraction is housed in a rigid case 6, and the inside of the sealed bag 7 is provided through the rigid case. A vibration-proof mount with liquid damping for an engine, characterized in that the sealed space is communicated with the sealed space through an orifice member 8, and the sealed space and the sealed bag 7 are filled with liquid.