JPH02169313A - Liquid sealed-system cylindrical vibro-isolating mount - Google Patents

Abstract

PURPOSE:To damp each vibration in both vertical and axial rectangular directions so favorably by using a vibration transmissibility abating action at a time when a fluid passes through an orifice or the like by receiving its resistance, jointly in addition to a vibration damping action by elasticity of a vibrationproof base body. CONSTITUTION:A core fitting 1 is clamped to a car body 18, and an outer casing fitting 2 is surrounded concentrically with this core fitting 1, while a toroidal vibrationproof base body 3 is installed interposingly between these elements. In addition, an elastic film 4 is set up in space between both the fittings 1, 2, and thereby a liquid chamber 9 is formed. Moreover, a partition body 5, partitioning off this chamber into two upper and lower chambers 9A, 9B, is set up in the liquid chamber 9, and this partition body 5 is formed of a partition ring 10 with an orifice 13, a press-in ring 11 and a rubber plate 12. When vibration out of a road surface is transmitted to a suspension member 19, each volumetric capacity of each of the two upper and lower chambers 9A, 9B is changed, and a liquid 17 is made to flow through the orifice 13 in a reversible manner. With this constitution, utilizing viscosity inherent in the liquid 17, a good damping effect is thus secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid-filled cylindrical anti-vibration mount suitable as an anti-vibration mount for a suspension member of an automobile.

(Prior art) Conventional anti-vibration mounts used for automobile suspension members include a core metal fitting, such as an inner cylinder, an outer cylinder metal fitting divided vertically into two parts with a flange, and a rubber elastic mount to integrate them. When assembled, the outer cylinder metal fitting is press-fitted from below into the suspension member, and the inner cylinder and the vehicle body are fastened together with bolts, etc. be done.

In the anti-vibration mount installed in this way, insert metal fittings are inserted into the rubber of the anti-vibration base in order to adjust the movement in the direction perpendicular to the axis of the suspension.
The structure allows the spring constant to be controlled by providing groove-shaped cutouts in the rubber layer.

(Problems to be Solved by the Invention) The above-mentioned anti-vibration mount exhibits high damping performance in a low frequency range against vibrations in the vertical direction of the vehicle in order to improve riding comfort and reduce noise inside the vehicle. On the other hand, there is a need for something that can have a low dynamic spring constant at high frequencies, but conventional rubber elastic bodies that exert a damping effect alone cannot meet this requirement due to problems such as the durability of the rubber. However, it has not been possible to provide a product with desirable vibration damping characteristics.

In order to address these problems, the present invention exhibits characteristics that satisfy the above-mentioned requirements, and at the same time, it has a novel structure that prevents the external force in the direction perpendicular to the axis coming from the suspension member from being transmitted to the vehicle body as an unreasonable input. The present invention was developed to provide a cylindrical anti-vibration mount with a cylindrical structure, and its main purpose is to improve ride comfort in a vehicle and reduce noise inside the vehicle.

(Means for Solving the Problems) In order to achieve the above object, the invention of claim 1 provides a core metal fitting, a core metal fitting, and a core metal fitting. While concentrically surrounding the
An outer cylindrical fitting in which the same end as the mounting side of the core metal fitting is formed on the insertion side into the mating member, extending between the mounting side end of the core fitting and the same side end of the outer cylindrical fitting. A mount base is formed by a vibration-proofing base made of an elastic material that connects the entire circumferences of both metal fittings to each other, and a mount base is formed between the opposite end of the core metal fitting and the same side end of the outer cylindrical metal fitting. By providing an elastic membrane that spans the vibration-proof base at a distance in the axial direction of the core metal fittings and connects the entire circumferences of both metal fittings,
A liquid chamber is formed in the mount base, and the liquid chamber further includes a partition ring that is provided with an orifice penetrating through the thickness side and that fits liquid-tightly into the middle part of the outer cylinder metal fitting, and a partition ring that is fitted in the middle part of the core metal fitting. It consists of a press-fit ring fitted in a fluid-tight manner and a rubber plate extending between the press-fit ring and the partition ring to connect them all around, and the liquid chamber is connected to an upper chamber facing the vibration-proofing base. A first partition is provided to divide the chamber into two chambers, a lower chamber facing the elastic membrane, and a liquid such as antifreeze is filled to form a liquid-filled cylindrical vibration-proof mount.

On the other hand, the invention of claim 2 is arranged in a direction perpendicular to the axis of the core metal fitting, and is fixed to one side of the core metal fitting and the outer cylindrical metal fitting,
The first partition in claim 1 is replaced by a second partition made of a plate of a predetermined thickness which is separated so that an annular opening of a predetermined area is interposed on the other side. ,
Furthermore, the invention according to claim 3 is characterized in that the second partition is added to the structure according to claim 1 and is provided inside the liquid chamber.

(Function) When relative vertical vibration is applied between the core metal fitting and the outer cylindrical metal fitting to the vibration isolating mount according to the present invention, the vibration isolating base is deformed, so the upper chamber and lower chamber are divided into two. The volume of each liquid chamber in the chamber changes, and the fluctuation in increase and decrease at this time becomes a reversible state in response to vibration, and as a result, the enclosed liquid flows through the orifice and/or the annular opening.

Since the orifice has fluid flow resistance, high damping characteristics are obtained in the low frequency vibration region due to the viscosity of the liquid. Demonstrates high damping effect.

On the other hand, when the frequency of the annular aperture is high, the liquid flow becomes difficult to synchronize with the input vibration, and the law itself exhibits a resonance phenomenon at a given frequency, resulting in a low dynamic spring constant and a low dynamic spring constant in the high frequency range. The vibration transmission rate can be lowered.

In order to more effectively exhibit the above-mentioned characteristics in a predetermined vibration frequency range, the length and cross-sectional area of the orifice should be selected in the case of the first partition, and the opening area of the annular opening should be selected in the case of the second partition. , can be easily adjusted by selecting plate thickness and material.

By the way, when this anti-vibration mount is installed on a vehicle, not only vibrations in the vertical and axial directions, but also vibrations in the direction perpendicular to the axis are transmitted to the vehicle body through the outer cylinder metal fitting, the vibration-proof base, and the core metal fitting. The effect of this vibration reduces the effect of the high damping characteristics of the anti-vibration mount in the vertical direction.
In the present invention, since the vibration isolating base is provided close to the upper end on the body side, the moment force on the body caused by an external force in the direction perpendicular to the axis can be reduced, and the high damping characteristics in the vertical direction can be fully utilized. It will be.

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

FIG. 1 and FIG. 2 show an embodiment according to claim 1, and (1
Reference numeral 1 denotes a metal core fitting, which is formed into a cylindrical body having a through hole in the axial direction, and is bolted to the vehicle body Q8).

Note that depending on the application, the bolts may be rotatably fastened via bearings.

(2) is an outer cylindrical metal fitting, and a flange that serves as a stopper during installation is integrally provided at one end, and the suspension member α is installed by press-fitting it into the hole and fixing it. This outer cylindrical metal fitting (2) is arranged so as to concentrically surround the core metal fitting, and in this case, the insertion side is placed in the center so that the flange is on the side opposite to the vehicle body alO. Both metal fittings (1) are installed on the same side as the mounting side of the metal fittings (11), (21, the anti-vibration base (3)
) is bridged between the mounting side end of the core metal fitting +11, which is the side closer to the vehicle body α, and the same side end of the outer cylindrical metal fitting (2), and both metal fittings ( 1) and (2), this vibration isolating base (3) is made of elastic rubber and has a roughly donut shape and is attached to both metal fittings (11, +
Each member (1) is integrated with 21 by vulcanization adhesive treatment.

A mount base is formed by (2) and (3).

In the mount base, there is a space between the end of the core metal fitting (1) opposite to the mounting side and the end of the outer cylinder metal fitting (2) on the same side, spaced apart from the vibration isolating base (3) in the axial direction. An elastic membrane (4) tightly connected to the entire circumference of both metal fittings +1) and f2) is provided.

A rubber diaphragm is used for the upper (self-elastic membrane (4)), and a seal ring (7) having a sealing material is integrally bonded to the inner circumference of the donut-shaped diaphragm by vulcanization adhesive treatment, and a A flange-shaped intermediate cylinder (8) corresponding to the end shape of the outer cylinder fitting (2) is integrally joined by vulcanization adhesive treatment, and the seal ring (7) is attached to the core metal fitting α).
By press-fitting the intermediate cylinder (8) to the outer cylinder metal fitting (2), it is possible to airtightly span and fix the two metal fittings (1) and +21.

By attaching the elastic membrane (4) in this way, the core metal fitting (1), the outer cylinder metal fitting (2), and the vibration isolating base (3) can
A sealed space is formed within the manwood base, and this space is used as a liquid chamber (9).

(5) is a first partition provided in the liquid chamber (9) to divide the liquid chamber (9) into upper and lower halves, and the orifice a31
The partition ring Ql is made of metal or plastic and is press-fitted into the center of the inner wall of the outer cylindrical fitting (2). A [ is provided with an orifice a1 of a narrow passage consisting of a concave groove extending over the periphery, and at one end of the 0th floor of this orifice is a first opening α open to the lower surface side.
0, and the other end thereof is provided with two second openings α that are open to the lower surface side.

On the other hand, the press-fit ring αD is made of metal or plastic, and is a member that is press-fitted onto the outer periphery of the core fitting (1) in the same way as the seal ring (7).

The rubber plate (b) has a donut shape, and has an outer peripheral edge and an inner peripheral edge integrally bonded to the partition ring 0 (ll) and the press-fit ring αD by vulcanization adhesive. A body (5) is formed.

This first partition (5) is fixed at a predetermined location prior to attachment of the elastic membrane (4), and is used to divide the liquid chamber (9) into an upper chamber (9A) and a lower chamber as shown in FIG. (98), and the two chambers (9a) and (h) are communicated only through the orifice Q31 via the openings Q4) and Q51.

In the anti-vibration mount having a ridge configuration, Q[9 is a recess provided in the anti-vibration base (3) and has a function of adjusting the spring constant against vibrations applied in a direction perpendicular to the mount axis.

In addition, aη is a liquid such as ethylene glycol that is filled in a predetermined volume in the liquid chamber (9), and although the liquid surface may be filled individually, An elastic membrane (4) within the liquid of the liquid tank containing the liquid surface.
Liquid filling is accomplished at the same time as final assembly.

This anti-vibration mount is attached to a predetermined location on the vehicle as shown in Figure 2, but when vibrations from the road surface are transmitted to the suspension member a1, the outer cylindrical metal fitting (2) and the anti-vibration base (3)
The vibration causes a volume change in the upper chamber (9A) and lower chamber (98), and the liquid surface reversibly flows through the orifice α1.

As a result, high damping characteristics can be obtained in the low frequency vibration region due to the viscosity of the liquid αη.

Further, the frequency at which high damping characteristics can be obtained at this time is mainly determined by the dimension of the orifice α fathom, but it can be easily adjusted in accordance with the human vibration frequency of the part where the vibration isolating mount is used.

In this case, in addition to the vertical vibration, the vibration in the direction perpendicular to the axis also enters the body a through the outer cylinder fitting (2), the vibration isolating base (3), and the core fitting (11), so the high damping characteristics against the vertical vibration are effective. Normally, this is reduced, but since the anti-vibration base (3) is provided close to the body α side, it is possible to reduce the moment force against the body α caused by an external force in the direction perpendicular to the axis. This means that the high attenuation characteristics of

FIG. 3 and FIG. 4 are embodiments according to claim 2, and the first
Components that are the same as those in the examples shown in FIGS. The structure differs in that the body (6) is used.

That is, the second partition (6) acts on the diaphragm, and is formed into a roughly donut-shaped plate of a predetermined thickness using a high-rigidity plate such as a metal plate or an elastic rubber plate. An annular opening (1
3)' is disposed and fixed to the outer cylindrical metal fitting (2) in a direction perpendicular to the outer cylindrical metal fitting (2) so as to be interposed therebetween.

Note that the second partition (6) can be fixed and integrated with the outer cylindrical fitting (2) by press-fitting or the like, but contrary to the illustrated example, the annular opening (13) is attached to the inner wall of the outer cylindrical fitting (2). )' may be fixed to the core metal fitting (1) with an intervening wire.

In addition, in the illustrated example, the core metal fitting (1) and the inner periphery of the second partition (6) are in a concentric relationship, and the gap is a constant size everywhere;
If a predetermined opening area can be obtained, the second partition body (6
) may be oval or polygonal instead of circular.

In the example shown in FIGS. 3 and 4 explained above, the second partition body (6)
vibrates vertically within the liquid chamber (9), and the liquid Qn causes a resonance phenomenon in the annular opening (13)' mainly in a high frequency vibration range, and the spring constant is significantly reduced in a predetermined frequency range. In this case, the spring constant reduction range is determined by the opening area of the annular opening (13)', the thickness of the plate, etc., and can be easily adjusted.

As described above, in order to make this spring constant reducing characteristic effective, the structure in which the vibration isolating base (3) is attached to the body a81 side plays a major role.

Although each side has been explained above, the first partition (5) and the second
Needless to illustrate, it is possible to provide the partition body (6) in the liquid chamber (9) with an interval in the vertical relationship; Needless to say, this is an extremely effective vibration damping means.

(Effects of the Invention) As is clear from the above explanation, the present invention provides a vibration damping effect due to the elasticity of the vibration isolating base (3), as well as resistance at the orifice Q3) or/and annular opening (13)' of the liquid aη. As a result, the damping characteristics in the axial direction increase and the spring constant in the high frequency vibration range decreases, thereby improving the riding comfort of the vehicle. It has an excellent effect of improving noise levels and reducing noise inside the car.

Furthermore, in the present invention, the vibration isolating base (3) is provided near the mounting side end of the core metal fitting (1), so even if vibration 1 is applied in a direction perpendicular to the axis of the vibration isolating mount, this will suppress the vibration. There is no unreasonable input to the receiving side, and the damping characteristics against vertical vibration in the axial direction are effectively exhibited without being diminished.

[Brief explanation of the drawing]

FIGS. 1 and 3 are plan views of each embodiment of the present invention, and FIGS.
- It is a sectional front view taken along the X-ray, YOY vA. (1)...Core metal fitting, (2)...Outer cylinder metal fitting, (3)
...Vibration isolation base, (4)...Elastic membrane, (5)...
First partition body, (6)...Second partition body, (9)...
Liquid chamber, (9,)...upper chamber, (9B)...lower chamber,
0ω...Partition ring, (11)...Press-fit ring, (
2)...Rubber plate, α snore...orifice, (13)'
...Annular opening, α7)...Liquid. Figure 1

Claims (1)

[Scope of Claims] 1. A core metal fitting, an outer cylindrical metal fitting that is concentrically surrounded by the core metal fitting, and the same end as the installation side of the core metal fitting is formed on the insertion side into the mating member, and installation of the core metal fitting. The mount base is formed by a vibration-proofing base made of an elastic material that spans between the side end portion and the same side end portion of the outer cylindrical metal fitting and connects the entire circumferences of both metal fittings. A space between the opposite end of the metal fitting and the end of the outer cylindrical metal fitting on the same side is spaced apart from each other in the axial direction of the core metal fitting with respect to the vibration isolating base, and the entire circumference of both metal fittings is mutually connected. A liquid chamber is formed in the mount base by providing an elastic membrane that connects the mount base, and the liquid chamber is further provided with an orifice penetrating the thickness side to provide a liquid-tight seal in the middle part of the outer cylindrical metal fitting. It consists of a fitted partition ring, a press-fit ring that is liquid-tightly fitted to the middle part of the core metal fitting, and a rubber plate that extends between the press-fit ring and the partition ring and connects them all around, and the above-mentioned A liquid characterized by being provided with a first partition that divides the liquid chamber into two chambers, an upper chamber facing the vibration-proofing base and a lower chamber facing the elastic membrane, and filled with a liquid such as antifreeze. Enclosed cylindrical anti-vibration mount. 2. A core metal fitting, an outer cylindrical metal fitting that surrounds the core metal fitting concentrically and has the same end as the installation side of the core metal fitting formed on the insertion side into the mating member, and The mount base is formed by a vibration-proofing base made of an elastic material that connects the entire periphery of both metal fittings by extending between the same side end of the cylindrical metal fitting, and the opposite end of the core metal fitting An elastic member is provided between the end portion of the outer cylindrical metal fitting and the end portion of the same side of the outer cylindrical metal fitting, extending apart from the vibration isolating base in the axial direction of the core metal fitting, and connecting the entire circumferences of both metal fittings to each other. By providing a membrane, a liquid chamber is formed within the mount base, and a membrane is disposed in the liquid chamber in a direction perpendicular to the axis of the core metal fitting, and is fixed to one side with respect to the core metal fitting and the outer cylinder metal fitting. The other side is made of a plate of a predetermined thickness that is separated so that an annular opening of a predetermined area is interposed therebetween, and the liquid chamber is divided into two chambers, an upper chamber facing the vibration-proof base and a lower chamber facing the elastic membrane. 1. A liquid-filled cylindrical anti-vibration mount, characterized in that it is provided with a second partition that separates the two, and is filled with a liquid such as antifreeze. 3. A core metal fitting, an outer cylindrical metal fitting that surrounds the core metal fitting concentrically and has the same end as the installation side of the core metal fitting on the insertion side into the mating member, and The mount base is formed by a vibration-proofing base made of an elastic material that connects the entire periphery of both metal fittings by extending between the same side end of the cylindrical metal fitting, and the opposite end of the core metal fitting An elastic member is provided between the end portion of the outer cylindrical metal fitting and the end portion of the same side of the outer cylindrical metal fitting, extending apart from the vibration isolating base in the axial direction of the core metal fitting, and connecting the entire circumferences of both metal fittings to each other. A liquid chamber is formed in the mount base by providing a membrane, and the liquid chamber is further provided with an orifice penetrating on the thickness side, and a partition ring is fitted liquid-tightly into the middle part of the outer cylindrical metal fitting. A first partition body consisting of a press-fit ring that is fluid-tightly fitted to the middle portion of the core metal fitting, a rubber plate that spans between the press-fit ring and the partition ring and connects the entire circumferences thereof, and the core metal fitting. a second partition made of a plate of a predetermined thickness, which is arranged in a direction perpendicular to the axis of the metal core and the outer cylindrical metal fitting, and is fixed to one side of the core metal fitting and the outer cylindrical metal fitting, and is free from the other side so that an annular opening of a predetermined area is interposed therebetween; A liquid-filled cylindrical anti-vibration mount characterized by being spaced apart from the body in a vertical relationship and filled with a liquid such as antifreeze.