JPH07293633A - Tubular liquid-sealed vibration isolating mount - Google Patents

Abstract

PURPOSE:To improve the degree of freedom of the design of a vibration isolating mount by forming a diaphragm of a liquid chamber by an elastic body having ozone resistance different from an elastic body main body for connecting an intermediate tube to an inner tube, and shortening an orifice passage by making an air chamber on the lower part of the diaphragm released, in a liquid- sealed vibration isolating mount provided with the inner, outer and intermediate tube. CONSTITUTION:An elastic body 15 to be brought in pressure-contact with the inner surface of an outer tube 2, and for sealing a clearance between an partition wall 14 and the outer tube 2 is integrally formed on the partition wall 14 of an orifice forming member 4 for sectioning an orifice passage 9, and a diaphragm 7 formed by an upper side liquid chamber 8 and a seal elastic body 15 is integrally formed on the orifice forming part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical liquid-filled vibration-damping mount suitable for vibration-proof support of an engine on a vehicle body in an FF type automobile or the like.

[0002]

2. Description of the Related Art Various types of cylindrical liquid-filled anti-vibration mounts have been proposed which are interposed between an engine and a vehicle body and which support the engine vibrations so as to prevent the vibrations of the engine from directly propagating into the vehicle interior. Although many of them have been put to practical use, one type of such vibration-proof mounts is, for example, one shown in FIGS.

That is, as shown in the figure, the above conventional vibration-proof mount has an inner cylinder 1 installed laterally, an intermediate cylinder 3 which eccentrically encloses the inner cylinder 1 slightly downward and surrounds it in an axially parallel manner, and the intermediate cylinder 3 is concentric. A rubber elastic body 5 is vulcanized and bonded between the inner cylinder 1 and the intermediate cylinder 3 so as to extend over the lower parts of the cylinders 1 and 3.

Inside the rubber elastic body 5, a lower liquid chamber 6 having the rubber elastic body 5 as a chamber wall is formed, while above the inner cylinder 1, the lower wall is a rubber film. An upper liquid chamber 8'consisting of the diaphragm 7'is formed. The diaphragm 7'is directly vulcanized and bonded to the intermediate cylinder 3 so as to cover the notch in the upper part of the intermediate cylinder 3 from below.

Between the intermediate cylinder 3 and the outer cylinder 2,
A pair of semi-concave tubular orifice fittings 21 that form an orifice flow path 9 that connects the upper and lower liquid chambers 6 and 8'through the inner surface of the outer cylinder 2 and a part of the intermediate cylinder 3 are provided at the abutting ends. Is fitted and fitted with a pair of butted rubbers 19. The sealing of the orifice flow path 9 is performed by bringing the outer peripheral portion of the intermediate cylinder 3 and the partition wall 20 at the center of the orifice fitting 21 into close contact with the seal rubber film formed by thin film coating on the inner surface of the outer cylinder 2.

In the figure, 10 is a diaphragm cover, and 11 'is a stopper for the rubber elastic body.

[0007]

However, in the above-mentioned conventional vibration-proof mount, since the diaphragm is vulcanized and bonded to the intermediate cylinder, it is the same as the rubber elastic body main body which is similarly vulcanized and bonded to the intermediate cylinder. Since it is integrally formed of rubber, the air chamber formed by the diaphragm and the diaphragm cover has a closed structure to prevent ozone.

That is, in the above conventional vibration proof mount, it is necessary to set the flow length of the orifice flow path to be long corresponding to the diaphragm whose movement is hardened by the pressure of the closed air chamber. There was a problem that it was difficult to reduce the size.

According to the present invention, the diaphragm is formed of an elastic body having ozone resistance by coping with the actual situation as described above, and in particular by finding a new structure for an orifice forming member forming an orifice flow path, The purpose of this is to open the air chamber and shorten the orifice flow path to improve the degree of freedom in designing the vibration-proof mount.

[0010]

That is, the features of the vibration-proof mount of the present invention which meet the above-mentioned object are that an inner cylinder is provided laterally, an intermediate cylinder and an outer cylinder that surround the inner cylinder substantially in parallel with each other, and An elastic body main body interposed between the inner cylinder and the intermediate cylinder, a lower liquid chamber formed by the elastic body main body under the inner cylinder, and a diaphragm made of an elastic film at a part of the inner cylinder A cylinder provided with an upper liquid chamber formed above, and an orifice forming member which is arranged between the outer cylinder and the intermediate cylinder and which forms an orifice flow path for communicating the both liquid chambers with the inner surface of the outer cylinder. In the mold liquid filled vibration isolation mount, the partition wall of the orifice forming member that defines the orifice flow path is integrally formed with an elastic body that is pressed against the inner surface of the outer cylinder and seals between the partition wall and the outer cylinder. In the orifice forming member, the upper liquid chamber, the Lies was allowed provided integrally with the diaphragm formed by an elastic body for Lumpur.

[0011]

In the vibration-damping mount of the present invention, the diaphragm is integrally formed with the orifice forming member that forms the orifice flow path, and is integrally formed with the same elastic body as the sealing elastic body attached to the orifice forming member. Therefore, it is possible to configure the diaphragm by an elastic body having ozone resistance different from that of the elastic body, thereby making the lower air chamber open to the atmosphere to make the movement of the diaphragm flexible, and the orifice passage Can be shortened to improve the degree of freedom in designing the vibration proof mount.

Further, in the above-described vibration-proof mount of the present invention, the conventional sealing rubber film coating on the inner surface of the outer cylinder is eliminated by integrally forming the sealing elastic body on the partition wall of the orifice forming member. It is possible to eliminate the need to consider the lack of thickness of the seal rubber film and to eliminate the problem of distortion of the seal rubber film when the outer cylinder is contracted.

[0013]

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

FIG. 1 is an axially parallel sectional view showing a cylindrical liquid-filled vibration-damping mount according to an embodiment of the present invention, and FIG. 2 is an axially orthogonal sectional view thereof.
FIG. 3 is an enlarged cross-sectional view showing a lower portion of the mount of the embodiment before the outer tube is contracted, FIG. 4 is a side view showing an orifice forming member of the embodiment, FIG. 5 is a perspective view of the same, and FIG. 4 is a view in the direction of arrow A in FIG. 4, and FIG. 7 is a view in the direction of arrow B in FIG.

That is, as shown in FIGS. 1 and 2, the anti-vibration mount according to this embodiment has a horizontally-arranged inner cylinder 1 and this inner cylinder 1.
A rubber elastic body 5 as an elastic body main body, which is eccentric and surrounds in parallel with the axis, and an intermediate cylinder 3 and an orifice forming member 4 interposed between the inner and outer cylinders 1 and 2.
A lower liquid chamber 6 formed below the inner cylinder 1 by the rubber elastic body 5, and a diaphragm 7 made of a rubber film at the lower portion.
An orifice flow formed along the inner side of the outer cylinder 2 by the orifice forming member 4 and the upper liquid chamber 8 formed above the inner cylinder 1 to communicate the upper and lower liquid chambers 6, 8 with each other. And path 9.

The above-mentioned orifice channel 9 is shown in FIGS.
As shown in FIG. 2, since it meanders in an S shape or a spiral shape in places, it appears only in fragments in FIG.
Further, the orifice flow path 9 connects the upper and lower liquid chambers 6 and 8 with each other through a through hole 16.

Further, this vibration-proof mount is provided with a stopper member 11 inside the lower liquid chamber 6 to limit the range of vertical movement of the inner cylinder 1. The stopper member 11 is integrally formed by an orifice fitting 12 of the orifice forming member 4 which will be described later, and the inside thereof is filled with rubber.

On the other hand, as shown in FIGS. 4 and 5, the orifice forming member 4 is formed by an elastically deformable tubular body of which a part is cut out and which is substantially C-shaped in a side view. As shown in FIGS. 1 and 2, is composed of an irregularly shaped semi-cylindrical orifice fitting 12 and a partially cut rubber elastic body 13 for orifice that is vulcanized and bonded to the orifice fitting 12. There is. In this embodiment, the cutout portion 4a of the orifice forming member 4 is formed by the intermediate cylinder 3 as shown in FIG.
It is designed to be fitted and integrated with the convex portion 3a of
The notch portion 4a may be a slit-shaped member obtained by simply cutting the orifice forming member 4 in the axial direction. That is, the orifice forming member 4 pushes outward the rubber elastic body 13 for the orifice in the upper half portion (see FIG. 4), which can be freely moved by the notch portion 4a, to expand the intermediate cylinder 3
Can be fitted on the outside.

On the other hand, as shown in FIGS. 1 and 3, the orifice forming member 4 comprises a part of each of the orifice fitting 12 and the rubber elastic body 13 for the orifice, and has the orifice flow passage 9 and the upper liquid chamber 8. A partition wall 14 is formed upright so as to form partitions. As shown in FIG. 1, the partition wall 14 is integrally formed with a rubber seal elastic body 15 which is pressed against the outer cylinder 2 and seals between the partition wall 14 and the outer cylinder 2. When the partition wall 14 is formed by the orifice rubber elastic body 13, the sealing elastic body 15 is also integrally formed by the orifice rubber elastic body 13.

The seal elastic body 15 is shown in FIGS.
As shown in FIG. 5, in the partition wall 14 on the axially outer side, which is the outer wall in each of the upper liquid chamber 8 and the orifice passage 9, in this embodiment, it extends to the outer peripheral portion of the intermediate cylinder 3, and the seal The elastic body 15 is sandwiched between the intermediate cylinder 3 and the outer cylinder 2 to further enhance the sealing effect.

In the embodiment of the present invention, the upper liquid chamber 8 and the diaphragm 7 are integrally formed in the orifice forming member 4 by the seal elastic body 15, that is, the rubber elastic body 13 for the orifice. ing. The orifice rubber elastic body 13 forming the diaphragm 7 is made of rubber having ozone resistance, and is attached to the lower side of the diaphragm 7 to cover the diaphragm cover 10.
As shown in FIG. 2, a through hole 10a is formed to open the air chamber 17 formed between the diaphragm 7 and the diaphragm 7 to the atmosphere.

The partition wall 14 of the upper liquid chamber 8 has a ridge 18 projecting outward in the axial direction as shown in FIGS. 1 and 5, and as shown in FIG. 3 is fitted between the shoulder portion 10b of the diaphragm cover 10 to stabilize the mounting of the upper liquid chamber 8 in the mount.

However, when the vibration-proof mount of the embodiment of the present invention having the above-mentioned structure is used as an engine mount, when the vibration from the engine is transmitted, the rubber elastic body also vibrates and the upper and lower liquids inside A volume change occurs between the chambers 6 and 8 and the liquid reversibly flows through the orifice 9. As a result, due to the viscosity of the liquid, high vibration damping characteristics are exhibited in the low frequency vibration region, while liquid flow occurs in the high frequency vibration region. Since it becomes difficult to synchronize with the input vibration and the liquid resonates, the low dynamic spring constant reduces the vibration transmissibility to reduce vibration and noise in the passenger compartment.

In the vibration-proof mount according to the above-described embodiment of the present invention, the diaphragm 7 is integrally formed with the orifice forming member 4 forming the orifice flow path 9, and the sealing elastic member attached to the orifice forming member 4 is formed. Since it is integrally molded with the same elastic body as the body 15, the diaphragm 7 can be configured by an elastic body having ozone resistance different from the elastic body 5 that connects the intermediate cylinder 3 and the inner cylinder 1. Thus, it is possible to open the lower air chamber 17 to the atmosphere to make the movement of the diaphragm 7 flexible and shorten the orifice flow path 9 to improve the degree of freedom in designing the vibration proof mount. By integrally forming the sealing elastic body 15 on the partition wall 14 of No. 4, the conventional coating of the seal rubber film on the inner surface of the outer cylinder is abolished. Distortion problems of the sealing rubber film when the swaged outer cylinder while eliminating the need for consideration for underfill like seal rubber film can be eliminated.

Further, in the vibration-proof mount according to the embodiment of the present invention, the assembly of the orifice forming member 4 is extremely performed in the process of expanding the substantially C-shaped cylindrical body and fitting it on the intermediate cylinder 3. It becomes easier to perform, and the orifice channel 9
Is formed within the range of the C-shaped orifice forming member 4, so there is no need for complicated assembly such as abutting the flow paths of different members.

Although the embodiments of the present invention have been described above, each rubber (elastic body) can be formed of, for example, a synthetic resin having elasticity.

[0027]

As described above, the liquid-filled anti-vibration mount of the present invention is an elastic body that is pressed against the inner wall of the outer cylinder to the partition wall of the orifice forming member of the mount to seal between the partition wall and the outer cylinder. Is integrally formed, the orifice forming member is integrally provided with an upper liquid chamber and a diaphragm formed by the elastic body for sealing,
Since the diaphragm is integrally formed with the orifice forming member that forms the orifice flow path and is integrally formed with the same elastic body as the sealing elastic body attached to the orifice forming member, it is different from the elastic body of the mount. It is possible to configure the diaphragm with an ozone-resistant elastic body, which allows the lower air chamber to be opened to the atmosphere to make the movement of the diaphragm flexible, shorten the orifice flow path, and design the vibration-proof mount freely. It is possible to improve the degree of sealing. Further, by integrally forming a sealing elastic body on the partition wall of the orifice forming member, the conventional coating of the seal rubber film on the inner surface of the outer cylinder is abolished. When the problem of distortion of the seal rubber film when the outer cylinder is contracted is solved without consideration for lack of wall thickness etc. In which a marked effect.

[Brief description of drawings]

FIG. 1 is an axially parallel sectional view showing a cylindrical liquid-filled vibration damping mount according to an embodiment of the present invention.

FIG. 2 is a sectional view orthogonal to the axis of the same.

FIG. 3 is an enlarged sectional view of an essential part showing a lower portion of the mount of the embodiment before the outer tube is contracted.

FIG. 4 is a side view showing the orifice forming member of the embodiment.

FIG. 5 is a perspective view of the same.

FIG. 6 is a view on arrow A in FIG.

FIG. 7 is a view as seen from the direction of the arrow B in FIG.

FIG. 8 is a longitudinal cross-sectional view of the center of a conventional cylindrical liquid-filled vibration-damping mount.

9 is a cross-sectional view taken along line XX of FIG.

10 is an exploded perspective view of the anti-vibration mount shown in FIG.

[Explanation of symbols]

 1 Inner Cylinder 2 Outer Cylinder 3 Intermediate Cylinder 3a Convex Part of Intermediate Cylinder 4 Orifice Forming Member 4a Notch of Orifice Forming Member 5 Rubber Elastic Body 6 Lower Liquid Chamber 7 Diaphragm 8 Upper Liquid Chamber 9 Orifice Channel 10 Diaphragm Cover 11 Stopper Member 12 Orifice Metal Fitting 13 Orifice Rubber Elastic Body 14 Partition Wall 15 Sealing Elastic Body 16 Orifice Passage Hole 17 Air Chamber 18 Convex Strip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatsugu Takaoka 3rd Ikagayama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center

Claims (1)

[Claims] 1. A laterally provided inner cylinder, an intermediate cylinder and an outer cylinder that surround the inner cylinder substantially in parallel with each other, an elastic body main body interposed between the inner cylinder and the intermediate cylinder, and the elastic body main body. Disposed between the lower liquid chamber formed below the inner cylinder, the upper liquid chamber formed above the inner cylinder with a diaphragm made of an elastic film partially, and between the outer cylinder and the intermediate cylinder. And a partition wall of the orifice forming member that defines the orifice flow path in a cylindrical liquid-filled vibration damping mount that includes an orifice forming member that forms an orifice flow path that communicates the liquid chambers with the inner surface of the outer cylinder. An elastic body that is pressed against the inner surface of the outer cylinder to seal between the partition wall and the outer cylinder is integrally formed, and the orifice forming member is formed of the upper liquid chamber and the sealing elastic body. That the integrated diaphragm and Characteristic cylindrical liquid-filled anti-vibration mount.