JPH0629634B2 - Liquid damping type anti-vibration support device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid damping type anti-vibration support device used to support a vibration body such as an automobile engine in a vibration-proof manner.

(Prior Art) When an engine mounted on an automobile is supported in a vibration-proof manner, the large fluctuation range of the engine itself causes a large damping coefficient for low-frequency vibration with large amplitude that occurs at low speed, and high speed. There is a need for an anti-vibration support device that can satisfy the two requirements of high vibration insulation against high-frequency vibrations that sometimes occur, but low-frequency vibrations such as cranking vibrations and idling vibrations, and vibrations due to medium-frequency vibrations, It is difficult for both noise and high-frequency vibrations such as muffled sound and transmitted sound to exhibit effective and simultaneous anti-vibration properties because their characteristics are mutually opposite. It can be carried by the enclosed liquid, while the vibration insulation function can be carried by the rubber-vibration anti-vibration base material that forms the chamber wall for enclosing the liquid. Liquid damping type anti-vibration supporting devices have come to be adopted.

By the way, in this type of conventional anti-vibration support device, the inner chamber provided in the main body having the anti-vibration base material made of a rubber tubular body is separated by a partition plate.
It has a well-known structure in which each chamber is divided into two chambers, and these spaces are communicated with each other through an orifice provided in the partition plate, and liquid is enclosed in each chamber. Most are fixed to the inner wall of the body.

On the other hand, a partition plate having a thin structure to easily absorb small amplitude vibrations in a high frequency region has been proposed and used in some cases.

(Problems to be Solved by the Invention) In each of the conventional devices described above, in the former case, since the partition plate has high rigidity and has a fixed structure, the liquid pressure of the liquid chamber becomes high in the high-frequency vibration region, so that the moving spring There is a problem that the constant becomes large, which causes a muffled sound, which impairs the quietness of the passenger compartment.

On the other hand, regarding the latter, there is a problem that the damping characteristics against vibrations in the middle frequency and low frequency regions are deteriorated, and it is difficult to manufacture a partition plate with a thin film structure that has uniform mechanical strength and uniform characteristics. Had.

Therefore, the present invention provides a technical object to solve the drawbacks of such conventional devices of this type.
In order to exert damping performance against low-frequency vibration, a fluid bag placed on one side of a rigid partition plate is expanded synchronously in opposite phase to the vibration propagating from the vibrator. On the other hand, by contracting the fluid bag synchronously in the same phase in order to reduce the dynamic spring constant for high frequency vibration, it not only has a damping effect on low frequency vibration but also decompresses by high frequency vibration. It aims to suppress the rise and to eliminate muffled noise in particular, and to play a part in realizing low vibration and low noise of automobiles and the like.

(Means for Solving the Problems) However, the present invention allows a liquid damping type vibration damping support device (hereinafter referred to as a vibration damping mount) to be constituted by a vibration damping support and a fluid pressure generating device (15), The anti-vibration support is provided on the main body (1) having the anti-vibration base body (2) made of a rubber elastic body, and the rigidity is provided with the orifice (16) penetrating the inner chamber filled with the liquid in the thickness direction. Two chambers (12) with a partition plate (6) consisting of a plate,
In addition to partitioning into (13), a fluid bag (14) capable of changing volume is independently formed on the side of the vibration isolating substrate (2) of the partition plate (6).

Further, the fluid pressure generator (15) detects the vibration frequency of the vibrating body supported by the anti-vibration support body, and has the same frequency as this, and when the vibration frequency is in a low frequency range, it is reversed. It is formed in a device that generates pulsating pressure of the same phase in the phase and high frequency regions.

The present invention is characterized in that the fluid pressure generator (15) and the fluid bag (14) are connected by a pipe (17), and the fluid bag (14) is forcibly expanded and contracted by the pulsating pressure. And

(Operation) According to the present invention, the main body is provided when the vibrating body supported by the engine vibrates by virtue of the above-mentioned means.
Since the rubber elastic body which is the vibration-proof substrate (2) of (1) undergoes dynamic compression bending, the volumes of the chambers (12) and (13) on both sides of the partition plate (6) reversibly change.

In this case, the vibration of the anti-vibration support that causes low frequency vibration and the fluid bag
Due to the antiphase relationship with (14), the chamber containing the fluid bag (14) tries to expand or contract, whereas the fluid bag (1
4) conversely contracts or expands, resulting in an orifice (16)
Due to the movement of the liquid, a large amount of the liquid movement is naturally reversed according to the vibration, and at this time, the damping function by the throttling effect is sufficiently exerted, and the low frequency vibration can be effectively damped.

On the other hand, in response to the occurrence of high-frequency vibration, the hydraulic pressure in the chamber tends to rise, but since the fluid bag (14) expands and contracts in the same phase as the volume change of the chamber, the increase in hydraulic pressure is attenuated. Is
The dynamic spring constant on the high frequency vibration region side can be reduced, and the vibration transmission can be made effective or interrupted.

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.

The illustrated anti-vibration mount consists of an anti-vibration support and a fluid pressure generator (15).
The anti-vibration support is composed of the main body (1),
It has a first metal fitting (3), a second metal fitting (4), a rubber plate (5) and a partition plate (6) as main constituent members.

The main body (1) has a block-shaped rubber elastic body that serves as a vibration-proof base (2) with a metal tubular body (7) on one side and a mounting bolt (9) on the other side in the center. The metal flat plates (8) they have are attached together in the process of vulcanization molding.

The first metal fitting (3) has a hat shape and has a mounting bolt (1
(0) is fitted in the central part, but the peripheral part is
It is fixedly integrated with the end of the tubular body (7) in (1).

In addition, the first metal fitting (3) has a small hole (1
1) is bored to form an air circulation hole.

The second metal fitting (4) is a substantially L-shaped metal plate body, and is brought into contact with the vibration isolating base (2) from the side, and the metal flat plate (8).
After being brought into surface contact with, the mounting bolt (9) is inserted and then tightened, it is fixedly integrated with the main body (1).

On the other hand, the rubber plate (5) is laid horizontally so as to cover the open end of the tubular body (7) in the main body (1), and the peripheral portion thereof is the same as the end portion of the tubular body (7). By holding the first metal fitting (3) with the peripheral edge portion, the peripheral edge portion is fixed to the main body (1) in an airtight manner.

The anti-vibration support thus constructed has the anti-vibration base inside the main body (1).
The inner surface of (2), the inner wall surface of the tubular body (7) and one side surface of the rubber plate (5) are formed into an inner chamber of a hermetically sealed structure, and the partition plate (6) is formed in this inner chamber. The inner chamber is divided into two chambers (12) and (13) arranged vertically by the partition plate (6).

The partition plate (6) is formed of a rigid plate body such as a hard synthetic resin, the peripheral portion is thick, the inner portion surrounded by the peripheral portion is a thin flat plate portion, the peripheral portion Is provided with a groove (16) extending in the circumferential direction over substantially the entire circumference, and the groove (16) is divided by at least one swash plate portion (20) to form an arc shape over the entire circumference. A communication hole (18) that penetrates the peripheral portion from one end to the chamber (12) and a communication hole (19) that also penetrates the peripheral portion from the other end and faces the chamber (13). Are provided respectively (see FIGS. 2 and 3).

The partition plate (6) having such a structure is fixed by pressure fitting to the inner peripheral wall of the main body (1), for example, the inner peripheral wall of the metal tubular body (7). Groove (16) is in both chambers (12), (1
It becomes a passage that connects 3), and accordingly, this groove (1
6) is formed in the orifice that reversibly flows the fluid.

On the lower surface of the partition plate (6), that is, on the side of the vibration-proof substrate (2), a fluid bag (14) capable of changing volume is independently formed and appropriately fixed, but the fluid bag (14) is reinforced. An airtight flat flexible bag made of a rubber film having a cloth as a core is formed, and a pipe connection port is opened at one place.

The fluid pressure generating device (15) paired with the vibration isolating support having the above structure is a device for generating pulsating pressure so that the pulsation pressure can be increased / decreased and adjusted, and the vibrating body supported by the vibration isolating support is , For example, the vibration frequency of the engine is detected by a vibrometer, etc., and it has a structure that can generate a fluid pressure having a pulsation of the same frequency. Is in the low frequency range, for example, 45 Hz or less, air pressure of opposite phase (meaning a phase angle shift of 180 °) is generated with respect to the vibration of the vibrating body, and in the high frequency range exceeding 45 Hz, it is the same. It is formed so as to generate a fluid pressure in phase.

Then, the pressure fluid supply port of the fluid pressure generator (15) and the pipe connection port of the fluid bag (14) are connected by a pipe (17),
The fluid bag (14) is forcibly expanded and contracted by the pulsating pressure.

Although the device example of the present invention has the structure described above, the anti-vibration support body is filled with a liquid such as antifreeze liquid in each chamber (12), (13), and further as described above, the fluid pressure generation device (15) and the fluid. Bag (14) and tube (1
The vibration-proof support is used by interposing it as described in 7) and interposing it as a vibration-proof body between, for example, the body of the automobile and the engine.

In this case, since high-frequency vibrations generated during traveling are basically absorbed by the vibration-proof base body (2), muffled sound and transmitted sound can be absorbed and cut off satisfactorily.

On the other hand, low-frequency vibrations such as riddling vibrations occur in both chambers (12),
It is effectively damped by reversibly flowing the liquid in (13) through the orifice (16).

By the way, when low frequency vibration occurs, as shown in FIG. 4, the fluid bag (14) is expanded and contracted by the pulsating pressure of opposite phase and equal frequency. As described above, as a result of the remarkable diaphragm effect of the orifice (16), the damping coefficient for vibration becomes large, and low-frequency vibration can be effectively damped by the vibration-proof support.

On the other hand, when high frequency vibration occurs, the fluid bag (14) is expanded and contracted by the pulsating pressure of the same phase and the same frequency as shown in FIG. 5, so that the chambers (12), (13) The increase of the hydraulic pressure in) is reduced, the dynamic spring constant is reduced, and the transmission of vibration is effectively cut off.

As described above, according to the present invention, the partition plate (6) in the vibration-proof support body
The fluid bladder (14) closely attached to the fluid chamber (14) is forced to repeatedly expand and contract at the same frequency with the opposite phase when low frequency vibration occurs, and the fluid chamber While operating so as to contradict expansion and contraction, when high-frequency vibration occurs, on the contrary, it is designed to expand and contract in synchronization with the expansion and contraction of the liquid chamber. In addition to suppressing it, the dynamic spring constant can be reduced, and it has excellent damping and disconnection characteristics of muffled sound and transmitted sound.On the other hand, in the low frequency vibration region, the orifice (16) exerts the diaphragm action more effectively and is effective. Vibration damping is achieved.

Thus, it is possible to stably exhibit sufficient performance and disconnection performance against vibration in a wide range including low and high frequencies.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a main part according to an example of the present invention, FIG. 2 is a plan view of a partition plate in FIG. 1, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 5 and 5 are vibration characteristic diagrams showing the relationship between the vibration of the fluid bag and the vibration of the vibrating body in FIG. 1 in the low frequency region and the high frequency region, respectively. (1) …… Main body, (2) …… Vibration isolation substrate, (6) …… Partition plate, (12), (13) …… Room, (14) …… Fluid bag, (15) …… Fluid pressure Generator, (16) …… Olihuis, (17) …… Tube,

Front Page Continuation (72) Inventor Satoshi Ito 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Shuichi Okamoto 4-49, Kamehama-cho Tsu City, Mie (72) Inventor Kazuo Horinishi Mie 3-5-14, Shinmachi, Tsu-shi, Japan (56) References: Showa 58-119643 (JP, U) International publication 85/208 (WO, A)

Claims (1)

[Claims] 1. A rigid plate provided with an orifice (16) penetrating in a thickness direction an inner chamber provided in a main body (1) having a vibration-proof base body (2) made of a rubber elastic body and filled with a liquid. A partition plate (6) made of a body partitions the two chambers (12) and (13), and a volume-changeable fluid bag (14) is provided on the partition plate (6) on the side of the vibration isolation substrate (2). ) Is independently formed and the vibration frequency of the vibrating body supported by this vibration isolating support is detected, and when the same frequency is used and the vibration frequency is in the low frequency range. Is provided with a fluid pressure generator (15) that generates a pulsating pressure in the opposite phase and in the same phase when in a high frequency range, and the fluid pressure generator (15) and the fluid bag (14) are connected by a pipe (17). A liquid damping type vibration-damping support device, which is connected and forcibly expands and contracts the fluid bag (14) by the pulsating pressure.