JP2538464B2 - Fluid filled cylinder mount - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled tubular mount suitable for use as an automobile suspension bush, an engine mount, or the like, which has a vibration-damping effect based on the flow action of a fluid enclosed therein. Is.

[0002]

BACKGROUND ART Conventionally, as a kind of a connecting body that is interposed between two members constituting a vibration transmission system and connects both members with a vibration isolation, an inner cylindrical metal member and an outer side thereof are separated by a predetermined distance. It has a structure in which the outer cylinder fittings arranged are connected by a rubber elastic body interposed between them, and it is mainly against vibrations in the direction perpendicular to the mount axis that are input between the inner and outer cylinder fittings. A cylindrical mount that exhibits a vibration damping effect is known, and has been used as, for example, an automobile suspension bush or a cylindrical engine mount.

Further, in recent years, in order to cope with the sophistication of required characteristics due to the trend toward higher grades of vehicles, a relative internal pressure fluctuation is caused between the inner and outer cylinder fittings when vibration is input. Various so-called fluid-filled tubular mounts having a structure in which a plurality of fluid chambers are formed and an orifice passage that connects the fluid chambers to each other are provided, and various so-called fluid-filled cylindrical mounts have been proposed. Since it is possible to easily obtain a vibration-proof effect that is difficult to obtain by only a rubber elastic body based on the resonance action, it has come to be favorably used as a mount for an automobile or the like.

By the way, in the orifice passage in such a fluid-filled tubular mount, the inner tubular metal fitting and the outer peripheral surface thereof are conventionally arranged as generally shown in Japanese Patent Laid-Open No. 62-274128. It is formed between the fitting and the orifice fitting, or is disclosed in JP-A-56-1.
As disclosed in Japanese Laid-Open Patent Application No. 64242 and Japanese Patent Laid-Open No. 61-270533, it is formed between the outer tubular fitting and the orifice fitting fitted to the inner peripheral surface thereof.

However, in any of these structures, since a special member for forming the orifice passage is required, increase in the number of parts constituting the mount and complication of the mount structure are avoided. However, there is also a problem that the orifice forming space is easily restricted in location.

In order to solve such a problem, it may be possible to form a through hole extending between the fluid chambers and penetrating the inside of the rubber elastic body, and forming an orifice passage by the through hole. However, in such an orifice passage, the cross-sectional area is likely to change due to the deformation of the rubber elastic body at the time of input of vibration or load, so that stable vibration damping characteristics cannot be obtained, which is not practical. It wasn't.

[0007]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is that the orifice has a simple structure and can exhibit stable vibration damping characteristics. An object is to provide a fluid-filled tubular mount having a passage.

[0008]

SOLUTION: In order to solve such a problem, in the present invention, an inner tubular metal fitting and an outer tubular metal fitting, which is arranged concentrically or eccentrically at a predetermined distance outside the inner tubular metal fitting,
While connecting with a rubber elastic body interposed between them , the radial direction so that they are located on both sides with the inner tubular metal fitting interposed therebetween.
Form two rubber outer pockets on the rubber elastic body.
And the openings of those pockets with the outer cylinder metal fittings.
The pressure receiving chamber and the pressure receiving chamber that are filled with the specified incompressible fluid and that cause internal pressure fluctuation during vibration input
And forming an equilibrium chamber which volume change is allowed by the deformation of the fine flexible wall portion, the fluid-filled cylindrical mount comprising an orifice passage connecting them together pressure receiving chamber and the equilibrium chamber, said equilibrium chamber Along the bottom of the pocket
Spreads in the mount circumferential direction and penetrates in the mount axial direction
By forming a lightening hole in the rubber elastic body,
Thin the bottom wall of the pocket that provides the equilibrium chamber.
A flexible wall portion that is easily elastically deformed.
Write, said orifice passage, at a position close to the side of the front Kigai tube metal fitting, thereby forming through said rubber elastic body in opposite directions of the equilibrium chamber and the pressure receiving chamber, the lightening hole, the orifice of the orifice passage between the passage and the inner cylinder gold instrument
Allowed extended to the vicinity at the extending portion of meat vent holes, that constitute a cavity extending along said orifice passage, it is an its features.

Further, in such a fluid-filled tubular mount according to the present invention, in the pressure receiving chamber,
From the inner tubular metal fitting side, protruding toward the outer tubular metal fitting,
A cushioning rubber integrated with the rubber elastic body is provided and
Grain-shaped irregularities are formed on the outer peripheral surface of the tip of the rubber .

[0010]

In other words, in the fluid-filled cylindrical mount having the structure according to the present invention, the orifice passage is formed by penetrating the rubber elastic body forming the partition between the fluid chambers. Further, it can be advantageously formed with a simple structure without requiring any special member, and the forming space thereof is not particularly limited.

[0011] Moreover, in the such orifice passage is formed by the outer tubular member you close position thereto, with its shape is advantageously maintained between the inner cylinder gold instrument not adjacent position thereto and the orifice passage The cavities effectively prevent the change of the cross-sectional area due to the deformation of the rubber elastic body at the time of vibration input, and the desired prevention based on the resonance action of the fluid flowing in the orifice passage is thereby prevented. The vibration effect can be effectively and stably exhibited.

[0012]

The embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIGS. 1, 2, and 3 show the principle of the present invention .
One of automotive engine mount to facilitate the solution
The reference example of is shown. In these drawings, 10 and 12 are an inner tubular metal member and an outer tubular metal member, respectively, which are arranged at a predetermined distance in a radial direction from each other and are eccentrically provided with a predetermined dimension, and are interposed between them. They are integrally connected by a rubber elastic body 14. In the engine mount 16, the inner cylinder fitting 1
0 is attached to the power unit side, and the outer cylinder metal fitting 12 is attached to the vehicle body side, so that the power unit can be supported in a vibration-proof manner with respect to the vehicle body. In such a mounted state, the inner and outer tubular metal fittings 10, 12 are
By applying a power unit load between them, both of the tubular metal fittings 10 and 12 are positioned substantially concentrically, and the eccentric direction of the both tubular metal fittings 10 and 12 (in FIG. 1,
The main vibrations to be isolated are input in the vertical direction).

More specifically, the inner tubular member 10 is formed in a thick cylindrical shape. In addition, a stopper metal fitting 18 having a substantially rectangular frame shape is externally mounted and welded and fixed to a central portion of the inner metal fitting 10 in the axial direction. First and second stopper portions 20 and 22 are formed so as to project at a predetermined height.

A metal sleeve 24 is arranged radially outward of the inner tubular member 10 with a predetermined distance. The metal sleeve 24 has a large-diameter thin-walled cylindrical shape as a whole, and first and second window portions 26 and 28 each having a substantially rectangular shape are provided at portions facing each other in one radial direction. Has been. Then, such a metal sleeve 24 is arranged eccentrically by a predetermined dimension on the outer side of the inner cylindrical metal fitting 10, and under such an arrangement state, the first and second window portions 26, 28 of the metal sleeve 24 are The first and second stopper portions 20 and 22 are projected from the inner tubular metal fitting 10 side toward the first and second window portions 26 and 28 while being positioned on both sides in the eccentric direction.

Then, as shown in FIGS. 4 and 5, between the inner tubular member 10 and the metal sleeve 24,
A rubber elastic body 14 is interposed. This rubber elastic body 14
Is formed with a thick cylindrical shape as a whole,
The inner cylindrical metal member 10 is formed on the inner peripheral surface thereof, and the metal sleeve 24 is formed on the outer peripheral surface thereof by vulcanization adhesion as an integrally vulcanized molded product 30.

In addition, the rubber elastic body 14 constituting the integrally vulcanized molded product 30 includes the inner cylindrical metal fitting 10 and the metal sleeve 2.
4 on both sides in the eccentric direction with respect to the first pocket 3
2 and a second pocket portion 34 are formed and opened to the outer peripheral surface through the first window portion 26 and the second window portion 28 provided on the metal sleeve 24, respectively. Incidentally, these first and second pocket portions 32, 34
The inside of each of the first and second stopper portions 2 is
0 and 22 are set to projecting positions, and buffer rubbers 36 and 38 having a predetermined thickness are integrally formed by the rubber elastic body 14 on the projecting end faces of the respective stopper portions 20 and 22. . Furthermore, the first and second pocket portions 3 are respectively provided on both end surfaces in the axial direction of the rubber elastic body 14.
Recesses 40 and 42 are formed between the bottoms of the second and the inner cylinders 10 and the inner tubular metal member 10 at a predetermined depth in the axial direction. The recesses 40 and 42 form the rubber elastic body 1.
The spring characteristic of No. 4 is adjusted and the rubber elastic body 14
The stress and deformation concentration in the above are alleviated, and the durability is improved.

Furthermore, in the rubber elastic body 14, the metal sleeves 24 are respectively provided on both sides in the radial direction orthogonal to the facing direction of the first and second pocket portions 32 and 34.
The axial center portion is located near the side and along the inner peripheral surface of the metal sleeve 24.
Two pockets 3 extend in the opposite directions of the two pockets 3
Communication holes 44, 44 are formed to connect the communication holes 2, 34.

Further, slits 46 serving as voids are formed in the radially inner portions of the communication holes 44, 44, respectively.
Is formed so as to penetrate axially between the communication hole 44 and the inner tubular metal member 10. Here, the slit 4
6 is formed along each communication hole 44, preferably over at least ½ of the total length L of the communication hole 44. That is, since such a slit 46 is formed between the communication hole 44 and the inner tubular member 10, the portion of the rubber elastic body 14 that constitutes the wall portion of the communication hole 44 is different from the other portion. Since the rubber elastic body 14 is made independent, the wall portion of the communication hole 44 is effectively prevented from being deformed even when the inner cylindrical metal fitting 10 is deformed due to the displacement of the metal sleeve 24. Can be done.

Then, as shown in FIGS. 1, 2, and 3, a large-diameter cylindrical outer cylinder fitting 12 is externally inserted to the integrally vulcanized molded product 30 having such a structure, The diameter of the metal sleeve 24 is reduced by octagonal drawing and the like, and the metal sleeve 24 is fitted on the outer peripheral surface of the metal sleeve 24 to be integrally assembled.
A thin seal rubber layer 48 is integrally vulcanized and adhered to the inner peripheral surface of the outer tubular metal member 12 over substantially the entire surface thereof.

That is, by assembling the outer tubular metal member 12, the openings of the first and second pocket portions 32 and 34 formed in the integrally vulcanized molded product 30 are fluid-tightly covered. Thereby, the first and second fluid chambers 5 in which predetermined incompressible fluids are enclosed by the first and second pocket portions 32 and 34, respectively.
0,52 are formed. It should be noted that water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is preferably adopted as the fluid sealed in the fluid chambers 50 and 52.

Further, in the first and second fluid chambers 50 and 52 thus formed, they are communicated with each other by the communication holes 44 and 44 provided through the rubber elastic body 14. As a result, these communication holes 44, 44
Thus, the orifice passages 54, 54 that allow the fluid to flow between the fluid chambers 50, 52 are formed.

Therefore, in the engine mount 16 having the above-described structure, when vibration is input between the inner and outer cylindrical metal fittings 10 and 12, the first fluid chamber 50 and the second fluid chamber 52 are separated from each other. Based on the relative internal pressure fluctuations caused during
Orifice passages 54, 5 between the two fluid chambers 50, 52
The flow of fluid through 4 will be generated,
As a result, a predetermined vibration damping effect can be exhibited based on the flow action or resonance action of the fluid made to flow through the orifice passages 54, 54. In particular, in the present reference example, based on the resonance action of the fluid flowing in the orifice passage 54, the orifice passage 54 is provided with a damping effect for the input vibration in the low frequency region corresponding to shake or bounce. The cross-sectional area and length of 54 are tuned.

In particular, in this engine mount 16, the orifice passage 54 is formed from the place where the orifice passage 54 is formed by the communication hole 44 formed through the inside of the rubber elastic body 14. There is no need for special members to
The reduction of the number of parts and the simplification of the mounting structure can be achieved very effectively.

In addition, the orifice passage 5 is formed by the communication hole 44 formed by penetrating the inside of the rubber elastic body 14 as described above.
By configuring No. 4, it is possible to advantageously secure the cross-sectional area of the orifice passage without being particularly restricted, the degree of freedom in setting the orifice passage can be sufficiently secured, and the design can be easily changed. As a result, the tuning of the mount anti-vibration characteristics can be performed with a great degree of freedom, and the required anti-vibration characteristics can be easily and effectively realized.

Moreover, in the engine mount 16 described above, the slit 46 is provided between the communication hole 44 which constitutes the orifice passage 54 and the inner tubular metal member 10.
The portion of the rubber elastic body 14 where the orifice passage 54 is formed can be effectively separated from the vibration transmission path between the inner and outer cylindrical metal fittings 10 and 12 of the rubber elastic body 14, whereby the inner and outer cylindrical metal fittings are formed. Even when the rubber elastic body 14 is deformed at the time of inputting the vibration between 10 and 12, the deformation of the orifice passage 54 can be advantageously prevented, and the desired prevention by the fluid flowing in the orifice passage 54 can be prevented. The vibration effect can be exerted extremely effectively and stably.

Here, the present invention is the same as described above.
Unlike the engine mount 16 with one fluid chamber structure,
A structure in which a pressure receiving chamber and an equilibrium chamber are provided on both sides of a tubular metal fitting.
Applied to a fluid-filled cylindrical mount
Te, 6 and 7 are automotive engine mount 60 as an embodiment of the present invention is shown. Incidentally, in this embodiment, the for reference example similar structure have been members and sites, respectively, in the figure, denoted by the same reference numerals as the reference example, and omitting the detailed description To do.

In the engine mount 60,
With respect to the rubber elastic body 14, a lightening hole 62 that extends along the bottom surface of the second pocket portion 34 between the second pocket portion 34 and the stopper metal fitting 18 has the rubber elastic body 14 in the mount axial direction. It is formed to penetrate. This lightening hole 62 can effectively reduce or prevent the generation of tensile stress in the rubber elastic body 14 when the weight of the power unit is exerted when mounting the mount, and the durability can be improved advantageously. .

The thinned hole 62 reduces the thickness of the bottom wall of the second pocket 34 to form a flexible wall 64 which is easily elastically deformed. As a result, in the engine mount 60 of the present embodiment, the openings of the first pocket portion 32 and the second pocket portion 34 are covered with the outer tubular metal fitting 12, respectively, so that the first pocket portion 32 is covered. Thus, the pressure receiving chamber 66 in which the internal pressure fluctuation is induced at the time of vibration input is formed, while the second pocket portion 34 is balanced so that the volume change is easily allowed based on the deformation of the flexible wall portion 64. A chamber 68 is formed.

Further, the lightening holes 62 have both ends in the mount circumferential direction which extend to the vicinity of the communication holes 44, which penetrate the rubber elastic body 14 and form the orifice passages 54. It is located. On the other hand, in the communication hole 44, only a portion (a portion of l _{1 in} FIG. 6) facing the lightening hole 62 has a constant cross section, and the other portion (a portion of l _{2 in} FIG. 6). Are formed with a larger cross-sectional area. In particular, in the present embodiment, the portion of the communication hole 44 formed with a large cross-sectional area: l ₂ has a tapered shape that opens toward the pressure receiving chamber 66 side, and the rubber elastic body 14 at the time of load input. The cross-sectional area is increased as the deformation amount of the area increases.

That is, in the communication hole 44 composed of such a small cross-sectional area portion: l ₁ and a large cross-sectional area portion: l ₂ , the inside of the communication hole 44 is prevented by the fluid flowing therein. The vibration characteristics are mainly determined only by the small cross-section area: l ₁ , and the large cross-section area: l ₂ does not substantially function as an orifice passage. Therefore, the orifice passage 54 is formed only by the small cross-sectional area: l _{1 of the} communication hole 44.

Then, in the small cross-sectional area portion: l ₁ of the communication hole 44 forming the orifice passage 54, the wall portion formed by the rubber elastic body 14 has the lightening hole 62.
Since the extended portion is independent of the other portions, even when the rubber elastic body 14 is deformed at the time of inputting a load, the deformation of the wall portion can be effectively prevented. As is apparent from this, in the present embodiment, the extension of both ends of the lightening hole 62 in the mount circumferential direction is performed.
The provided portion forms a void that reduces or prevents the deformation of the orifice passage 54.

Therefore, even in the engine mount 60 according to the present embodiment, the rubber elastic body 1 is used as in the reference example.
4 in which the orifice passage 54 is formed can be effectively separated from the vibration transmission path between the inner and outer cylindrical metal fittings 10 and 12 in the rubber elastic body 14, whereby the orifice passage 54 is substantially formed even when vibration is input. It can be maintained in a constant shape.

Therefore, when the flow of the fluid through the orifice passage 54 is caused by the relative internal pressure fluctuation caused between the pressure receiving chamber 66 and the equilibrium chamber 68 at the time of the vibration input, that fluid is generated. The desired anti-vibration characteristics exhibited based on the resonance action of (3) can be stably exhibited, and therefore, the same effects as those of the reference example can be effectively exhibited.

The portion of the communication hole 44 in which the orifice passage 54 is not formed: l ₂ does not necessarily have to be formed in a tapered shape, and can be passed through the orifice passage 54 even when the rubber elastic body 14 is deformed during vibration input. The area may be larger than the portion forming the orifice passage 54: l ₁ to the extent that the vibration damping characteristics exerted by the flowing fluid are not significantly affected.

Further, the engine mount 60 of this embodiment.
In the above, in the outer peripheral surface 70 of the distal end portion of the cushioning rubber 36 that constitutes the stopper mechanism that regulates the relative displacement amount of the inner and outer cylindrical metal fittings 10 and 12, the entire surface thereof is provided with grain-like irregularities. When the displacement is regulated, the cushioning rubber 36 is applied to the outer tubular metal fitting 12 on the surface having the ruggedness.
The inner peripheral surface (seal rubber layer 48) is made to abut.

In other words, since the wrinkle-shaped unevenness is provided on the outer peripheral surface 70 of the tip end portion of the cushioning rubber 36, when the cushioning rubber 36 is brought into contact with the seal rubber layer 48 when a large load is input, these The coefficient of friction between the contact surfaces can be advantageously reduced, and relative sliding between the cushion rubber 36 and the seal rubber layer 48 due to the deformation of the cushion rubber 36 can be easily tolerated. From where
The generation of abnormal noise (sliding contact noise or frictional noise) due to the slip can be effectively reduced or prevented.

Further, the effect of reducing the friction coefficient due to the wrinkle-like concavities and convexities can be exerted further because the contact surface is in the pressure receiving chamber 66 and the fluid is interposed between the contact surfaces. is there.

Due to such a concavo-convex asperity, the generation of abnormal noise due to the slip between the contact surfaces due to the deformation of the cushion rubber 36 at the time of contact with the seal rubber layer 48 is reduced or prevented. Therefore, it is possible to sufficiently thicken the cushioning rubber layer 36 while avoiding the problem of the generation of such an abnormal sound, thereby, when the stopper mechanism operates (when displacement is regulated). ) Impact mitigation
It can be achieved more effectively.

The embodiments of the present invention have been described in detail above, but these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, the orifice passages do not necessarily have to be formed on both sides in the circumferential direction between the fluid chambers, but may be formed on only one side thereof.

[0043]

[0044]

[0045] In addition, in the above embodiment shows a specific example of an application of the present invention to an automotive engine mount, the present invention may contain other automotive suspension bushing or differential mount, a member mount, etc., Or for tubular mounts in various devices other than automobiles,
Of course, any of them can be applied to advantage.

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be carried out, and such an embodiment does not depart from the spirit of the present invention.
Both are included within the scope of the present invention,
Needless to say.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an automobile engine mount for facilitating the understanding of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view showing an integrally vulcanized molded product forming the engine mount shown in FIG. 1.

5 is a view taken along the line VV in FIG.

FIG. 6 is a cross-sectional view showing an engine mount for an automobile as one embodiment of the present invention.

7 is a vertical cross-sectional view of the engine mount shown in FIG.

[Explanation of symbols]

 10 Inner Cylinder Metal Fitting 12 Outer Cylinder Metal Fitting 14 Rubber Elastic Body 16 Engine Mount 24 Metal Sleeve 30 Integrated Vulcanized Molded Product 44 Communication Hole 46 Slit 50 First Fluid Chamber 52 Second Fluid Chamber 54 Orifice Passage 60 Engine Mount 62 Thickening Hole 66 Pressure receiving chamber 68 Equilibrium chamber

Claims (2)

(57) [Claims] 1. An inner tubular metal fitting and an outer tubular metal fitting, which is arranged concentrically or eccentrically with a predetermined distance on the outside thereof, are connected by a rubber elastic body interposed therebetween, In the radial direction so that it is located on both sides of the inner cylinder fitting.
Form two rubber outer pockets on the rubber elastic body.
And the openings of those pockets with the outer cylinder metal fittings.
The pressure receiving chamber and the pressure receiving chamber that are filled with the specified incompressible fluid and that cause internal pressure fluctuation during vibration input
And forming an equilibrium chamber which volume change is allowed by the deformation of the fine flexible wall portion, the fluid-filled cylindrical mount comprising an orifice passage connecting them together pressure receiving chamber and the equilibrium chamber, said equilibrium chamber Mount along the bottom of the pocket giving
A lightening hole that extends in the circumferential direction and penetrates in the mount axial direction
The equilibrium chamber is formed by forming the rubber elastic body.
Thinning the bottom wall of the pocket to give elastic deformation
While configured as easily Do the flexible wall portion, said orifice passage, at a position close to the side of the front Kigai tube gold instrument, through the rubber elastic body in opposite directions of the equilibrium chamber and the pressure receiving chamber and forming, the lightening hole, Shi allowed extending between said orifice passage and said <br/> inner cylinder gold instrument to the vicinity of the orifice passage
Because, at the extending portion of meat vent hole, the fluid-filled cylindrical mount, characterized in that to constitute a cavity extending along said orifice passage. 2. The inner cylinder metal fitting side in the pressure receiving chamber
From the rubber elastic body protruding toward the outer tubular fitting from
An integral cushion rubber is provided, and the tip of the cushion rubber is outside
The fluid-filled tubular mount according to claim 1 , wherein the circumferential surface is provided with grain-like irregularities .