JPH01316538A - Liquid damping type vibration isolating mount - Google Patents

Abstract

PURPOSE:To maintain the quietness in an automobile room by forming the captioned vibration isolating mount with a partition member on which through holes are dispersedly provided on a partition board and a rubber stopper member which closes a part of the through holes with filling layers while closely attaching a thin layer thereto. CONSTITUTION:The chief components of the vibration isolating mount of an automobile are a body 1, a first metal fitting 3, a second metal fitting 4, a rubber board 5, and a partition board 6. The partition board 6 consists of two members, a partition member 14 and a stopper member 15. The partition member 14 is formed into a disk shape with a rigid body and through holes 16 are dispersedly provided thereon. The stopper member 15 is made of rubber and closes at least a part of the through holes with filling layers, while closely attaching thin layers along both sides. At the time of generating a high frequency oscillation, the stopper member 15 becomes in a movable condition. Thereby, the entrance of noise from an engine can be prevented maintaining the quietness in an automobile room.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid-damped vibration-isolating mount used to support an oscillating body such as an automobile engine in a vibration-isolating manner.

(Prior art) The damping function for low-frequency vibrations can be carried out by the enclosed liquid, and the vibration-absorbing function for high-frequency vibrations can be carried out by the vibration-proofing base material of a rubber elastic body that forms the chamber wall for sealing the liquid. Among these types of vibration isolating mounts, Japanese Patent Laid-Open No. 61 No. There is an anti-vibration mount disclosed in Japanese Patent No. -45130.

By the way, as shown in Fig. 9, in this vibration-proof mount, a fluid-tight chamber provided in a main body (1) having a vibration-proof base (2) made of a rubber elastic body is divided into two chambers α2) by a partition plate (6). ,
The basic structure is such that the chambers Q2) and 03 communicate with each other through an orifice a1 provided in the partition plate (6), and a liquid is sealed in each chamber. , an inner portion surrounded by a thick peripheral portion is formed as a thin flat plate portion, and at least one through hole αe is formed in the flat plate portion.
and a partition member a0 provided with an orifice αη on the peripheral edge thereof, and two opposing plate portions that can cover the through hole (161) along both sides of the flat plate portion. The partition plate (6) is formed by a stopper member a9 which is engaged with the partition member Oa so as to be able to move slightly toward and away from both surfaces of the flat plate part, and the following measures against vibrations are formed. As stated (becomes effective).

That is, when the oscillator supported by the engine etc. vibrates, the main body (the rubber elastic body 11 receives dynamic compressive deflection and the volume changes reversibly between the two chambers Q21 and Q3).
Because the vibration frequency is low and the amplitude is large, the partition plate (6)
The stopper member 09 is in a state where the through hole αe of the partition member is generally closed, and as a result, the liquid moves through the orifice 01, and naturally the liquid flow is reversed in the forward and reverse directions according to the vibration. A damping function due to the aperture effect is exhibited, and low frequency vibrations can be effectively damped.

On the other hand, in response to high-frequency vibrations, the liquid pressure in both chambers Q2) and Q31 tends to rise, but since the amplitude of the vibrations in this case is small and fast, the stopper member 0!9 is As the liquid is almost separated from the flat plate part and flows not only through the orifice aη but also through the through hole Ql, the increase in liquid pressure is suppressed and the dynamic spring constant in the high frequency region is reduced. Therefore, vibration transmission can be effectively cut off.

(Problem H to be solved by the invention) As described above, the conventional vibration isolating mount illustrated can sufficiently exhibit vibration isolation performance, but on the other hand, the stopper member Q"9 Since it is a movable structure that moves toward and away from the partition member α, it comes into contact with the partition member <14) every time it moves in response to vibrations, and there is a problem that a tapping sound is generated at that time.

Incidentally, the above-mentioned tapping noise is low decibel, but in the case of a car that requires quietness, this hitting noise may propagate into the cabin of the vehicle and mislead people into thinking that a malfunction has occurred, which can sometimes lead to complaints. be.

The present invention was invented in an attempt to provide an improved anti-vibration mount which can provide a solution to such hitting noises with an hour wheel structure and which does not differ from conventional ones in terms of anti-vibration performance. The purpose of this research is to demonstrate the effectiveness of reducing vibration and noise in automobiles, etc. in terms of comfort.

(Means for Solving the Problems) As is clear from the attached drawings showing the embodiments, the present invention forms a fluid-tight chamber in a main body having a vibration-proofing base made of a rubber elastic body, The partition plate is divided into two chambers, the two chambers are communicated with each other through an orifice provided in the partition plate, and a liquid is sealed in each chamber. a partition member in which a plurality of through holes are dispersedly provided in a thin lattice part, and the orifices are provided in the peripheral edge part; a thin layer in contact with both surfaces of the lattice part without gaps; A liquid damping vibration isolation mount is formed by a rubber stopper member having a filling layer that fills at least a portion of each through hole and being brought into close contact with the partition member.

(Function) When the vibration isolating mount having the above structure undergoes a reversible volume change in the chambers on both sides of the partition plate due to vibration, if the vibration is a low frequency vibration with a large amplitude, the filling layer of the stopper member and the filling layer The thin layer on the outside of both the layer and the through hole undergoes deformation in which it bulges from the volume decreasing side to the volume increasing side, that is, it bends, reaches its elastic limit, and does not bend any further, causing liquid to move through the orifice. At this time, a damping function due to the aperture effect is exhibited. On the other hand, for high-frequency vibrations, since the vibration amplitude is small, the portion of the stopper member that causes the aforementioned deflection reversibly deflects and deforms in response to the vibration amplitude within the elastic limit, and as a result, the liquid flows into the orifice. but also
Changes in chamber volume caused by deflection of the stopper member are also affected by flow interference, suppressing the tendency for the liquid pressure to rise, thus reducing the dynamic spring constant in the high frequency region and effectively blocking vibration transmission. be able to. □Please note that the stopper member only bends due to elastic deformation.
It does not generate any abnormal noise, functions as a vibration damper in a quiet environment, and can achieve its intended purpose.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

The anti-vibration mount for an automobile according to the embodiment of the present invention illustrated in FIG. 1 includes a main body (1), a first metal fitting (3), and a second metal fitting (4).
), a rubber plate (5) and a partition plate (6) as main constituent members.

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

The first metal fitting (3) has a hat shape and has a mounting bolt 0Ω fitted in the center, and its peripheral portion is crowned with the end of the cylindrical body (7) in the main body (11). After that, it is fixed and integrated with the main body (1) by caulking.

Note that this first metal fitting (3) has a small hole OD formed at an appropriate location such as the side thereof to form an air circulation hole.

The second metal fitting (4) is a metal plate having an abbreviated shape, and is brought into contact with the vibration isolating base (2) from the side and in surface contact with the metal flat plate (8) for the installation. After inserting the bolt (9), it is fixed and integrated with the main body (1) by tightening it.

On the other hand, the rubber plate (5) is a cylindrical body (
7) is placed horizontally so as to cover the opening side, and its peripheral edge is held between the end of the cylindrical body (7) and the peripheral edge of the first metal fitting (3). It is fixed to the main body (1) in an airtight manner.

The anti-vibration mount consists of the main body (11), the inner surface of the anti-vibration base (2), the inner wall surface of the cylindrical body (7) and the rubber plate (11).
5) is formed with an inner chamber having a sealed structure with one side as a peripheral wall, and a partition plate (6) is installed horizontally in this inner chamber,
This partition plate (6) partitions the inner chamber into two chambers CL and Q3) arranged above and below.

The partition plate (6) is composed of two members, a partition member Oa and a stopper member θ. First, the partition member Q41 has a disc shape made of a rigid body of light alloy or hard synthetic resin, and has a thick peripheral edge. At the same time, the inner part surrounded by the peripheral edge part is formed into a thin wall, and the thin inner part is formed into a lattice part in which a plurality of through holes αQ are distributed. A groove αη extending in the circumferential direction over approximately the entire circumference is recessed in the portion, and this groove a1 is divided by at least one swash plate portion (2I and becomes an annular passage extending approximately over the entire circumference). , from one end of the chamber (
A communication hole 0 facing the room (A) is provided, and a communication hole Q91 is provided which also passes through the peripheral portion from the other end and faces the room (A).
(See Figures 3 and 4).

The partition member a having such a structure is fixed to the inner circumferential wall of the main body (1), preferably to the inner circumferential wall of the metal cylindrical body (7), by pressure fitting. 0
2) and Q3), and therefore, this groove 0 is formed as an orifice through which liquid flows reversibly.

However, as shown in FIG. 3, for the partition member a in the illustrated example,
Thirteen through holes Q6) are dispersedly drilled in the lattice part, with one circular through hole (16A) in the center and "cocoon" shaped through holes (168) radially around it. In addition, six triangular through holes (16,) with rounded corners are provided between each of the through holes (16 m), and the central through hole (16 A'') A ring-shaped lattice bar is formed around the lattice bar, and branched lattice bars extending radially and branch-like from the lattice bar are formed.

This arrangement of holes is possible because the through holes are regularly distributed, the total area of the through holes accounts for a large proportion of the total area of the lattice section, and the lattice bars are arranged vertically and horizontally. This is because it is a pattern that satisfies the following three conditions: it extends over a wide area and the strength of the lattice portion is high.

Next, the stopper member 00 is made of rubber, and as shown in FIG. 2, unvulcanized rubber is filled into each of the through holes 00 and a thin plate-like layer is formed in contact with both sides of the lattice portion. By vulcanizing the integrated rubber layer, a structure that is integrally adhered to the partition member Oa can be obtained. A member having thin layers that are in close contact with each other is easily formed.

In addition, the stopper member a is attached to the partition member θ during the vulcanization process.
Either adhesive or non-adhesive treatment may be used for the season.
In short, it may be of any type as long as it has an integral form that is in close contact with the partition member Oa without any gaps.

The anti-vibration mount which houses the partition plate (6) having the above-mentioned structure has a liquid such as antifreeze liquid sealed inside the α-wave on each chamber side, thus completing the liquid damping type anti-vibration mount. Ru.

When this anti-vibration mount is used as an engine support in a car, for example, high-frequency vibrations during driving are basically absorbed by the anti-vibration base (2), so muffled sound and transmitted sound are well absorbed.

On the other hand, low- and medium-frequency vibrations such as idling vibrations are effectively absorbed by causing the liquid in both chambers (b) and (131) to flow reversibly through the orifice αη.

Since the vibration in this case has a large amplitude, the stopper member 0
5+ is a through hole Q from the chamber on the volume decreasing side to the chamber on the opposite side.
The filling layer intervening at f9 and the thin layers on both sides undergo a bulging deformation, which reaches its elastic limit and remains in a fixed state without deformation any further, and this state is occupied for most of the time when vibration is occurring. .

As a result, the liquid moves through the orifice aη while being constricted, thereby exhibiting a damping function.

On the other hand, in the case of high-frequency vibrations, the amplitude is small and fast, so the deflection is reversible within the elastic limit according to the vibrations, so the volume change in this part also affects the movement of the liquid, causing the orifice αη and As a result of their cooperation, the increase in fluid pressure in both chambers and alpha hot water is suppressed.

Therefore, the dynamic spring constant becomes small, muffled sound and transmitted sound are absorbed, and it is possible to prevent abnormal noise from entering the passenger compartment.

Regarding this vibration-proofing effect, the thickness of the lattice part of the partition member α0 in the partition plate (6) is set to 1 to 4 mm, and the space factor of the through hole αQ to the total area of the lattice part is set to 30 to 90.
Set to %. Further, the shape of the through-hole αe can be modified in various ways, and depending on the required strength and space factor of the lattice, it may be circular, oval, oval, etc., and there is no limit to the number thereof.

On the other hand, the stopper member 0!9 has a rubber hardness of 40 to 60 degrees, and a thickness of 0.5 to 3 degrees on one side. What is necessary is to set a combination that satisfies the required durability and characteristics within the range defined by OR.

Further, the thickness does not need to be uniform over the entire surface, and the thickness may vary in some areas.

Furthermore, the locations where the through-hole αe is filled are not limited to all of the through-holes, but some multiple locations such as one location illustrated in FIGS. 5 and 6, three locations illustrated in FIGS. 7 and 8, etc. It may be of.

By using one of the above-mentioned ranges that is effectively set, it has become possible to effectively reduce the dynamic spring constant in the medium and high frequency range exceeding 4511z, and thus in the low, medium and high frequency vibration range. It is possible to provide sufficient blocking performance against abnormal noises such as muffled sounds.

(Effects of the Invention) As described above, the present invention provides a partition member aa in which the partition plate (6) is made of a rigid body and is provided with through-holes Q[9 dispersedly, and at least a part of the through-holes aQ are filled. Since the rubber stopper member α9 is closed with a layer and a thin layer is adhered along both sides, when low frequency vibration occurs, the stopper member α reaches its elastic limit and becomes fixed.
When high-frequency vibrations occur, the stopper member Q5) enters a movable state in which it vibrates reversibly. Therefore, it is possible to suppress the increase in fluid pressure in the high-frequency vibration region and to reduce the dynamic spring constant, thereby reducing muffled sound and transmission. Since it has excellent sound blocking properties, it prevents noise from entering the vehicle engine and maintains the quietness of the vehicle interior.

Furthermore, for low frequency vibrations, only the orifice a performs its original liquid flow function, so that effective vibration damping can be achieved.

In this way, it is possible to exhibit sufficient blocking performance against vibrations in a wide range of low, medium, and high frequencies.

In particular, in the present invention, the partition plate (6) is an integral structure and does not generate any tapping noise, so quietness is maintained, and furthermore, the stopper member α has a portion that fills each through hole 019, and the partition member Q4 ) and a thin flat plate layer along both sides of the partition member α, the degree of connection between the partition member α and the stopper member α is strong, and a long life is ensured.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of one embodiment of the present invention, FIG. 2 is an enlarged plan view of the partition plate in FIG. 1, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG. 2, FIGS. 5 and 7 are enlarged plan views of each side of the partition plate according to the present invention, FIG. 6 is a sectional view taken along C-C in FIG.
The drawings are a sectional view taken along the line D-D VA in FIG. 7, and FIG. 9 is a sectional front view of a conventional liquid damping vibration isolation mount. (11...Main body, (2)...Vibration isolation base, (6)...
...Partition plate, (2), 031...Chamber, Oa...Partition member, α...Stopper member, OQ...Through hole, 0 sword...Orifice. Patent applicant: Toyo Rubber Industries, Ltd. Figure 1 Figure 2 Figure 3 16-hole hole Figure 4 Figure 5

Claims (1)

[Claims] 1. A fluid-tight chamber is formed in a main body having a vibration-proofing base made of a rubber elastic body, and the chamber is divided into two chambers by a partition plate,
The two chambers communicate with each other through an orifice provided in the partition plate, and a liquid is sealed in each chamber. In addition to forming a plurality of thin-walled lattice sections,
a partition member in which the orifice is provided on the peripheral edge;
It is characterized by being formed of a thin layer that contacts both sides of the grid portion without a gap, and a rubber stopper member that has a filling layer that fills at least a portion of each of the through holes and is brought into close contact with the partition member. Liquid-damped anti-vibration mount.