JPH0625730Y2 - Assembly structure type liquid filled strut mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an assembly structure type liquid-filled strut mount suitable for an automobile strut vibration-proof mount.

(Prior Art) As this type of automobile vibration-proof mount, a vibration-proof rubber having a structure in which rubber is filled between a core metal fitting and an outer tubular metal fitting is often used.

(Problems to be Solved by the Invention) The above-mentioned anti-vibration rubber is transmitted to the vehicle interior as road noise due to vibration caused by unevenness of the road surface.
The main component of this vibration exists in the high frequency range of 80 to 400 Hz, and in the past it was mainly dealt with by reducing the dynamic spring constant of the rubber itself in the high frequency range as much as possible to lower the vibration transmissibility. I've been

However, with rubber itself, there is a limit to significantly lowering the dynamic spring constant in the high frequency range from the viewpoint of the rubber's original characteristics and the durability of the rubber when subjected to an excessive load. I couldn't do enough.

The present invention has been made in order to solve the drawbacks of the conventional anti-vibration rubber in order to solve such problems, and it is possible to exhibit the vibration isolation property by liquid in addition to the original anti-vibration property of rubber. The object of the present invention is to provide a mount structure that can be used and to improve comfort by improving vibration damping performance against high frequency vibrations and reducing indoor road noise.

(Means for Solving the Problems) However, the present invention, as shown in the embodiment of the accompanying drawings, includes a core metal fitting, an outer cylindrical metal fitting concentrically surrounded by the core metal fitting, and both metal fittings over the entire circumference. A mount base is formed of a rubber-like elastic body that is connected by a rubber-like elastic body, and a diaphragm made of an elastic body is provided between the two metal pieces at a position spaced apart by a predetermined distance in the axial direction of the core fitting from the vibration-isolating base. A liquid chamber consisting of a space is formed in the mount base by fixing it over the entire length of the mount base, and the liquid chamber is arranged in a direction perpendicular to the axis of the core metal fitting and fixed to one of the metal fittings. On the other hand, a liquid-filled strut mount in which the liquid chamber is filled with a liquid, which is provided with a plate-like body that is separated so that an annular opening of a predetermined area is interposed, and the outer cylinder metal fitting protrudes at the sealing surface. 2 in the axial direction so that they can be connected liquid-tightly by fitting It is characterized in that the vibration-proof base is fixed to the outer cylinder fitting on one side and the diaphragm is fixed to the outer cylinder fitting on the other side.

(Operation) When vertical vibration is applied to the core fitting with respect to the mount according to the present invention, the liquid flows into the annular opening due to the volume change of each liquid chamber divided into two by the deformation of the vibration isolating substrate.

When the frequency is low, the flow of the liquid is performed in synchronization with the input vibration, and the action of the liquid is almost eliminated.

Therefore, the dynamic spring characteristic mainly depends on the rubber characteristic of the vibration-proof substrate, and the vibration-proof effect in the low frequency range can be obtained as in the conventional case.

On the other hand, when the frequency is high, the liquid flow becomes difficult to synchronize with the input vibration, and the liquid itself exhibits a resonance phenomenon at a predetermined frequency, resulting in a low dynamic spring constant and high vibration transmissibility in the high frequency range. Can be lowered.

Normally, the vibration transmitted from the road surface enters the core metal fittings,
The force attenuated through the flow resistance of the diaphragm and the filling liquid is transmitted to the outer tubular metal fitting, and is transmitted as vibration and noise into the vehicle interior via the body fastened with bolts or the like.

At this time, since the outer tubular metal fitting is divided into two, the force transmitted through the vibration-proof base does not directly act on the diaphragm mounting portion on the outer tubular metal fitting side, so that the seal portion is unlikely to be deformed or deteriorated, and the stable sealing performance is obtained. Lasts for a long time.

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

In FIGS. 1 and 2, (1) is a metal core metal fitting, which is composed of a vibration-proof base fixing part (1 _A ) and a bearing mounting part (1 _B ) and is integrally welded to penetrate. A hole is formed in a cylindrical body having an axial direction, and the bearing (13) is fixed to the lower end portion by caulking, and is bolted to the vibration input member.

(2) is the first metal fitting (2 _A ) divided into two parts by the outer cylinder fitting in the axial direction
And the second metal fitting (2 _B ), both metal fittings (2 _A ), (2 _B ) have a brim portion serving as a sealing surface at the abutting portion, and have a substantially L-shaped cross-sectional shape. It is finished as a tubular body by abutting at both brim portions and caulking at a plurality of places such as three places and integrating them.

The outer cylinder (2) is arranged so as to be concentrically surrounded by the core metal (1).

Said first fitting (2 _A), a second fitting thin rubber layer constituting the integral with vibration-isolating base (3) to be described later to the sealing surface in the flange portion of the (2 _B) (8)
Is attached to the side of the second metal fitting (2 _B ) (see FIG. 3), the rubber layer (8) intervenes when the butt is integrated, so that the liquid seal is securely formed. , Both metal fittings
It also functions as a cushioning material to mitigate vibration transmission between (2 _A ) and (2 _B ).

Then, the vibration-damping base (3) made of a rubber-like elastic body and the diaphragm (4) are bridged to the core metal fitting (1) and the outer cylinder metal fitting (2) so that both the metal fittings (1), The antivibration base body (3) is fixedly attached to (2). The antivibration base body (3) is provided on the outer periphery of the antivibration base body fixing portion (1 _A ) of the core metal fitting (1) and the second metal fitting (2 _B ) Is provided so as to extend between the inner peripheral part and the inner peripheral part.

On the other hand, the diaphragm (4) has a thin donut shape made of rubber, for example, and has a cylindrical end of the bearing mounting portion (1 _B ) of the core metal fitting (1) and a first metallic fitting (2) of the outer cylindrical metal fitting (2). _A ) and the end on the same side, and it is fixed.
(4) outer ring (9) and inner ring (10) made of metal or plastic
These two wheels (9), (10) are made by vulcanizing and adhering them together.
To the first fitting (2 _A ) and the bearing mounting part (1 _B ) with the seal rubber (1
An airtight connection is ensured by fitting them through 1) and 12).

In addition, omitting one of the two wheels (9) and (10), the first metal fitting
(2 _A ) or the bearing mounting portion (1 _B ) may be directly vulcanized and bonded.

In this way, the diaphragm (4) is located at a predetermined distance in the axial direction of the core metal fitting (1) and the outer cylinder metal fitting (2) with respect to the vibration-proof base body (3). Liquid chamber (5) consisting of an airtight space inside by assembling (1) to (4)
Is formed.

Then, a plate-like body (6) as a vibrating plate is arranged in the liquid chamber (5), and this plate-like body (6) is made of a highly rigid plate such as a metal plate or a rubber-like elastic plate having elasticity. , Or a composite plate of both plates is formed into a substantially donut-shaped plate having a predetermined thickness.

In the illustrated example, the diaphragm (6) is the first metal fitting (2) of the outer metal fitting (2).
_A ) An annular opening with a specified area fixed to the inner circumference of the core fitting (1)
The core metal fitting (1) is arranged at right angles as the (7) surrounds it, but in addition, it is fixed to the core metal fitting (1).
The outer tubular fitting (2) may be provided with an annular opening (7) having a predetermined area so as to be in contact with the inner wall and intervene.

The vibrating plate (6) is fixed by press fitting, etc.
It can be easily fixed and integrated with (1) and (2) .Usually, the core metal (1) and the diaphragm (6) have a concentric relationship between the inner circumferences, and the gap has a fixed size, but If the opening area can be obtained, the diaphragm for both brackets (1) and (2) with a circular cross section
The inner peripheral shape of (6) does not necessarily have to be circular, but may be elliptical,
A polygonal shape is also possible.

The strut mount having the above-mentioned structure is the first metal fitting, which is an integrated structure of the core metal fitting (1), the second metal fitting (2 _B ) and the vibration damping base (3)
(2 _A ) and the vibrating plate (6) are produced as an integrated structure, respectively, and the first metal fitting (2 _A ) and the second metal fitting are arranged so that the rubber layer (8) interposes both of them. (2 _B ) are connected by butting the both flanges, and fixedly integrated by caulking or bolting.

By assembling the thus obtained assembly in a liquid such as ethylene glycol and then assembling the diaphragm (4) in this liquid, assembly and liquid filling are performed at the same time.

In this case, since the vibration-proof base (3) and the diaphragm (4) are connected to the second metal fitting (2 _B ) and the first metal fitting (2 _A ) which are separate bodies, the airtightness is higher. It is possible to form the liquid chamber (15).

When this mount is used as an automobile strut mount, the vibrations that are normally transmitted from the road surface enter the core metal fitting (1) through the vibration-isolating base (3), the diaphragm (4) and the flow resistance of the liquid in the liquid chamber (5). It is transmitted to the outer tubular metal fitting (2) in a damped state, and transmitted as vibration and noise into the vehicle interior via the vehicle body fastened with bolts and the like.

By mounting the liquid in the mount and providing the plate (6) inside, liquid resonance due to input vibration can be generated, and the dynamic spring constant of the mount can be reduced, that is, the vibration transmissibility can be reduced. Is.

(Effect of the device) (a) When low frequency vibration is transmitted, the liquid in the liquid chamber (5) flows synchronously with the input vibration without a large pressure change. The rubber characteristics possessed by (3) are obtained, and the same vibration damping effect as the conventional rubber mount can be obtained.

(B) In the case of high-frequency vibration, it becomes difficult for the liquid to flow synchronously through the annular opening (7), causing the liquid itself to resonate at a specified frequency, resulting in a low spring constant. Effectively lowers the rate and contributes significantly to quieting the passenger compartment.

(C) Since the outer tubular metal fitting (2) is divided into the second metal fitting (2 _B ) on the vibration damping base (3) mounting side and the first metal fitting (2 _A ) on the diaphragm (4) mounting side, Since the force transmitted through the vibration-isolating base (3) does not directly enter the diaphragm (4) mounting part of the first metal fitting (2 _A ), both the inner and outer seals of the diaphragm (4) even when a large load is applied. Only a small vibration force transmitted through the diaphragm (4) acts on the part, and the leakage of the enclosed liquid due to the deformation of the metal fittings and the deterioration of the sealing elastic body is extremely unlikely to occur, and stable protection is provided over a long period of time. Vibration performance can be exhibited.

[Brief description of drawings]

FIG. 1 is a front view showing a longitudinal section according to an embodiment of the present invention, FIG. 2 is a plan view showing a half portion, and FIG. 3 is a partial view of a butt portion of an outer tubular metal fitting in FIG. (1) ... Core fitting, (2) ... Outer cylinder fitting, (2 _A ) ... 1st fitting, (2 _B ) ... 2nd fitting, (3) ... Anti-vibration base, (4) ... Diaphragm, (5) ... liquid chamber, (6) ... plate-shaped body, (7) ... annular opening.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadayoshi Ohira, Miyoshi-cho, Nishikamo-gun, Aichi, Otsukoshi 3 Okayama, Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (72) Kazuya Terashima Miyoshi, Nishikamo-gun, Aichi Machidaiji Uchikoshi Igayama 3 Toyo Tire & Rubber Co., Ltd. Automobile Parts Technology Center (56) Reference JP-A-63-190949 (JP, A) Actual Kaihei 2-96057 (JP, U) Actual Kaihei 2 -62135 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A mount base is formed by a vibration-damping base body made of a core metal fitting, an outer tubular metal fitting concentrically surrounded by the core metal fitting, and both metal fittings connected over the entire circumference. hand,
A diaphragm made of an elastic body is fixed to the vibration isolating base at a position spaced apart in the axial direction of the core metal fitting so as to be fixed between the metal fittings to form a liquid chamber having a space in the mount base. Arranging in the liquid chamber in a direction at right angles to the axis of the core metal fitting, and fixing to one of the metal fittings, and
On the other side is a liquid-filled strut mount in which a plate-like body that is separated so as to interpose an annular opening of a predetermined area is provided, and the liquid chamber is filled with liquid. It is divided into two parts in the axial direction so that they can be connected in a liquid-tight manner, and the vibration-proof base body is attached to the outer cylinder fitting on one side.
An assembled structure type liquid-filled strut mount, wherein the diaphragms are fixed to the outer cylinder fittings on the other side.