JPH0740751Y2 - Fluid-filled cylinder mount device - Google Patents

Description

[Technical field] The present invention relates to a fluid-filled tubular mounting device, and particularly, an excessive relative displacement of the inner and outer tubular metal fittings is advantageously controlled with a low impact property when an excessive vibration load is input. The present invention relates to the structure of a fluid-filled cylindrical mount device that can be used.

(Background Art) In recent years, as a type of a cylindrical mount device that is interposed between two members that are to be vibration-proof connected to each other, and that mainly suppresses transmission of vibration in the mount radial direction, it is concentric with a predetermined distance from each other. Or a pair of fluids in which a predetermined incompressible fluid is sealed between the inner and outer tubular metal fittings while elastically connecting the inner tubular metal fitting and the outer tubular metal fitting which are eccentrically arranged with a rubber elastic body. Various so-called fluid-filled cylindrical mount devices having a structure in which chambers are provided in a state of being communicated with each other through an orifice passage have been proposed, and are suitably used as, for example, suspension bushes and engine mounts of automobiles. Is becoming available.

In such a fluid-filled tubular mount device, it is generally necessary to define a fluid chamber of a predetermined volume therein and to enclose the fluid in the fluid chamber when manufacturing the fluid-filled tubular mount device. As shown in Japanese Patent No. 164428,
The fluid chamber is formed by closing the opening of the recess provided in the rubber elastic body and opening on the outer peripheral surface by the external insertion of the outer tubular metal fitting to the rubber elastic body. By performing the extrapolation operation in a predetermined fluid, the fluid can be enclosed in the fluid chamber at the same time as the extrapolation operation of the outer tubular fitting.

Further, in such a cylindrical mount device, in order to prevent excessive deformation of the rubber elastic body when a large vibration load is input, as described in the above publication, the fluid A stopper block is provided inside the chamber, the stopper block protruding from the inner tubular metal fitting side toward the outer tubular metal fitting side at a predetermined height and facing the inner surface of the outer tubular metal fitting side at a predetermined distance. The relative displacement of the inner and outer tubular metal fittings is restricted by the contact with the metal fittings.

In addition, a cushioning rubber having a predetermined thickness is usually formed on the protruding end surface of the stopper block in order to reduce the impact when the stopper block comes into contact with the outer cylindrical metal member.

By the way, it is desirable that the spring characteristic of the cushioning rubber is set to be soft in order to effectively reduce the impact when the stopper block abuts against the outer tubular metal fitting. It is effective to increase the protrusion height by forming the protrusions. However, if the protrusion height of the cushion rubber is increased in this way, the amount of strain at the time of contact increases and the durability decreases.

Therefore, it is extremely difficult to realize a satisfactory shock absorbing performance while ensuring sufficient durability by the shock absorbing mechanism using only the cushioning rubber provided on the protruding end surface of the stopper block. There was.

(Problem to be Solved) Here, the present invention has been made in the background of the circumstances as described above, and the problem to be solved is as follows.
Excellent impact absorption performance when contacting the displacement control member
It is an object of the present invention to provide a fluid-filled tubular mount device having a shock absorbing mechanism that can be advantageously realized with sufficient durability.

(Solution) In order to solve such a problem, according to the present invention, (a) an inner tubular metal member and (b) a pair of window portions that are radially opposed to each other, and those window portions are provided. A metal sleeve provided with a pair of concave grooves extending in the circumferential direction straddling the circumferential end portions of the inner cylindrical metal fitting and arranged at a predetermined distance outside the inner cylindrical metal fitting; and (c) the inner cylindrical metal fitting and the metal sleeve. And a rubber elastic body having a pair of pocket portions opened through the window portion of the metal sleeve, the rubber elastic body being interposed between the rubber sleeve and the inner tubular metal fitting. And an inner stopper having projections projecting from the inner tubular metal fitting side into the pockets at predetermined heights, and the first cushion rubber integrally provided on the projecting end faces of the projections. Member and (e) the metal sleeve A pair of half-cylinder-shaped fittings which are arranged in the window portion and which are assembled by positioning the both ends in the circumferential direction by the recessed grooves, with respect to the protrusions of the stopper member on their inner circumferential surfaces. The second stopper rubber integrally projectingly formed on the surface facing the portion, and (f) the outer stopper member is externally fitted and fixed on the outer peripheral surface of the metal sleeve. An outer cylindrical metal member integrally formed with a seal rubber on an inner peripheral surface for holding the position fixedly and liquid-tightly sealing the recess groove and the opening of the pocket portion, and (g) the opening of the pocket portion. Is sealed by the outer cylinder metal fitting, and a pair of fluid chambers formed therein, in which a predetermined incompressible fluid is sealed, and (h) the opening of the groove is the outer cylinder. By being sealed with metal fittings Its interior is formed, each other and an orifice passage communicating with such pair of fluid chambers,
The present invention is characterized by the fluid-filled type cylindrical mount device.

(Embodiment) Hereinafter, in order to more specifically clarify the present invention, an embodiment of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show a specific example of an automobile suspension bush having a structure according to the present invention. In these figures, reference numeral 10 denotes an inner tubular metal fitting, and an outer tubular metal fitting 12 is arranged radially outward of the inner tubular metal fitting at a predetermined distance and substantially concentrically. Then, the inner tubular metal member 10 and the outer tubular metal member 12 are integrally and elastically connected by a rubber elastic body 14 having a substantially cylindrical shape interposed therebetween.

Although not shown in the drawings, such a suspension bush is normally mounted by inserting a predetermined pivot into the inner hole 16 of the inner tubular metal fitting 10, while the outer tubular metal fitting 12 is attached. By being fitted and fixed in a mounting hole provided in a connecting member which is to be vibration-proof connected to the pivots, it is interposed between the pivots and the connecting member.

More specifically, as shown in FIG. 3 and FIG. 4, the inner tubular metal member 10 has a thick-walled cylindrical shape, and has a substantially thin-walled cylindrical shape outward in the radial direction. Metal sleeve 18
Are arranged at a predetermined distance and are slightly eccentric in the radial direction. Then, the inner tubular metal fitting 10 and the metal sleeve 18
In between, and the cylindrical rubber elastic body 14 is interposed, the inner peripheral surface of the rubber elastic body 14 with respect to the outer peripheral surface of the inner cylindrical metal fitting 10, and the outer peripheral surface with respect to the inner peripheral surface of the metal sleeve 18. Each of them is formed as an integrally vulcanized molded product 20 which is vulcanized and adhered.

In addition, the rubber elastic body 14 is provided with a pair of pocket portions 22, 22 that open to the outer peripheral surface at positions that face each other in one radial direction at the central portion in the axial direction.

Further, the metal sleeve 18 is formed with windows 24, 24 at portions facing the pockets 22, 22 when fixed to the outer peripheral surface of the rubber elastic body 14, respectively. The pocket portions 22, 22 are opened to the outer peripheral surface through 24, 24. Also, such a metal sleeve 18
The axial center portion of the window portions 24, 24 is reduced in diameter between both circumferential end portions thereof, thereby forming circumferentially extending recessed grooves 26, 26 between the window portions 24, 24. ing.

On the other hand, a stopper fitting 28 is fixedly attached to the central portion of the inner tubular fitting 10 in the axial direction. The stopper fitting 28 has a substantially thick annular plate shape, and has a pair of recesses 30 and 30 in which the outer diameter is reduced and recessed at opposing portions in one radial direction thereof. While
The stopper portions 3 in which both side portions in the radial direction orthogonal to the facing direction of the facing portions 30 and 30 project outward in the radial direction at a predetermined height
It is said to be 2, 32.

The stopper fitting 28 has a stopper portion 32,
32 are fitted and fixed to the inner cylindrical metal fitting 10 at the inner holes 34 of the pockets 22 and 22 in a state of protruding outward in the radial direction at a predetermined height, respectively.

Further, on the protruding end surface 36 of the stopper portion 32 of the stopper metal fitting 28, the first cushion rubber having a predetermined thickness is provided.
38 is integrally formed. This first rubber cushion 38
Is formed with a trapezoidal cross section, and the stopper 32
It is vulcanized and adhered so that it is located over substantially the entire length of the projecting end face 36 in the circumferential direction. As is clear from this, in the present embodiment, the stopper fitting 28 and the first cushion rubber 38 form an inner stopper member.

Further, in the integrally vulcanized molded product 20 having such a structure, the metal sleeve 18 is subjected to a diameter reduction process as required, and the rubber elastic body 14 is pre-compressed. After that, as shown in FIGS. 1 and 2, the fittings 40 are assembled to the windows 24, 24 in which the pockets 22, 22 are opened. This mounting bracket 40, as shown in FIGS. 5 to 7,
A window portion which is in the shape of a half-cylindrical body having substantially the same curvature as the metal sleeve 18 and which is provided in the metal sleeve 18.
The locking pieces 42, 42 are formed to have a width substantially the same as the opening width of the groove 24 and the concave groove 26, and at both ends in the circumferential direction thereof, the locking pieces 42, 42 projecting radially inward from both sides in the width direction, respectively. It is provided integrally.

And, as shown in FIG. 1 and FIG. 2, these mounting brackets 40, 40 are attached to the integral vulcanization molded article 20.
From the facing direction of the window portions 24, 24, the window portions 24 and the recessed groove 26 are assembled so as to fit in the opening portions of the opening portions of the window portion 24 and the concave groove 26 to cover those openings, and the circumferential end surfaces are brought into contact with each other, Each of the locking pieces 42 has a concave groove in the metal sleeve 18.
It is positioned by being locked to 26.

In addition, the mounting brackets 40, 40 are arranged on the inner peripheral surface side, which are located radially opposite the projecting end surface 36 of the stopper portion 32 when assembled to the integrally vulcanized molded product 20, respectively. A second cushion rubber 44, which has a trapezoidal cross section, projects radially inward at a predetermined height in the central portion of the direction, and is opposed to the first cushion rubber 38 with a predetermined distance.
Are provided and are integrally vulcanized and bonded. That is, as is clear from this, in this embodiment, the mounting members 40, 40 and the second cushion rubbers 44, 44 constitute the outer stopper member.

In particular, in this embodiment, since the mounting portions 40, 40 are assembled to the integrally vulcanized molded product 20, the opening portions of the window portion 24 and the concave groove 26 are closed. Through holes 46, 46 are provided for the 40, and the interior of the pocket portion 22 can be communicated to the outside through the through holes 46 even after the mounting brackets 40, 40 are assembled. . Also, each second cushion rubber
An arc-shaped recess 48 is provided at both sides in the width direction at the center of the 44, and its spring characteristic is set to be soft.

Then, as shown in FIGS. 1 and 2, the outer tubular metal fitting 12 is further externally inserted to the integrally vulcanized molded product 20 in which the mounting metal fittings 40, 40 are assembled. -ing Here, the outer cylinder fitting 12 is formed in a large-diameter cylindrical shape, and a thin sleeve-shaped seal rubber 50 is integrally vulcanized and adhered to the inner peripheral surface thereof over substantially the entire surface. Has been. And this outer cylinder metal fitting 12
Is externally attached to the integrally vulcanized molded product 20 and reduced in diameter, so that the inner peripheral surface thereof is pressed against the outer peripheral surfaces of the metal sleeve 18 and the mounting brackets 40, 40 via the seal rubber 50. The both ends in the axial direction are swaged, and the both ends in the axial direction are roll-crimped, so that the metal sleeve 18 is integrally assembled in a state of being locked to both end faces in the axial direction. In particular, in the outer tubular metal fitting 12 in the present embodiment, both axial end portions are made smaller in diameter than the central portion, and as described above, when the predetermined connecting member is mounted in the mounting hole, it is fitted and fixed. The operation can be easily performed.

That is, by assembling the outer tubular metal fitting 12, the openings of the pocket portions 22 and 22 and the concave grooves 26 and 26 covered by the mounting metal fittings 40 and 40 are liquid-tightly sealed, respectively. In such pockets 22, 22,
The pair of fluid chambers 52, 52 and the orifice passages 54, 54 for communicating the fluid chambers 52, 52 with each other in the concave grooves 26, 26.
Are formed respectively. Further, by the outer insertion and fitting of the outer tubular metal fitting 12, the outer peripheral surfaces of the mounting metal fittings 40, 40 are brought into contact with the inner peripheral surface of the outer metal fitting 12 to be held in a fixed position.

Further, these fluid chambers 52, 52 and the orifice passage 54,
A predetermined incompressible fluid such as water, alkylene glycol, polyalkylene glycol, silicone oil, etc. is filled and sealed in each of the 54.

By the way, such fluid encapsulation is generally carried out by performing an assembling operation of the bush in the fluid. However, in the suspension bush having the above-mentioned structure, the pocket is Since a through hole 46 is provided in each of the fittings 40 that close the portion 22 and the recessed groove 26, and the fluid can be injected through the through holes 46, the fittings 40 After assembling the integrally vulcanized molded article 20 of in the atmosphere,
It is possible to immerse the assembled product in a fluid and perform only the outer insertion operation of the outer cylinder fitting 12 in the fluid.

In the suspension bush having the above-mentioned structure, the fluid chamber between the inner and outer cylindrical metal fittings 10 and 12 is
When vibration is input in the bush radial direction, which is the opposite direction of 52, 52, the fluid flow through the orifice passages 54, 54 is changed based on the relative internal pressure change generated between the fluid chambers 52, 52. As known in the art, the resonance action of the fluid flowing in the orifice passage 54 causes the orifice passage 54 to have a predetermined frequency with respect to the input vibration in the tuned predetermined frequency range. The anti-vibration effect of can be exhibited. In the present embodiment, based on the flow of the fluid through the orifice passage 54, its length, flow passage cross-sectional area, etc. are tuned so that a low dynamic spring effect can be exerted at the time of vibration input such as road noise. It has been confused.

Therefore, in the suspension bush with such a structure, the inner and outer tubular metal fittings when an excessive vibration load is input.
The relative displacement amount of 10 and 12 depends on the protruding end surface 36 of the stopper 32.
And the inner peripheral surface of the mounting bracket 40, the first and second cushioning rubber 3
It will be possible to be regulated by abutment via 8, 44.
Since the thickness of the elastic body that can exert the impact absorbing effect at the time of contact as described above can be designed as the total thickness of the first buffer rubber 38 and the second buffer rubber 44, It is possible to suppress the thickness of the rubbers 38 and 44, that is, the amount of strain to a low level, whereby the improvement of shock absorbing performance can be advantageously achieved while ensuring sufficient durability. .

In addition, in such a suspension bush, the mounting brackets 40, 40 that form the outer stopper member are each formed in a half-cylindrical shape, and both circumferential ends thereof are formed in the concave groove 26 portion of the metal sleeve 18. From the structure that is assembled by being locked,
The positioning is advantageous, and the assembling is easy, and the mechanization of the assembling can be easily realized.

Further, in the suspension bush according to the present embodiment, through holes 46, 46 are provided in the respective fittings 40, and the assembling of the fittings 40, 40 to the integrally vulcanized molded product 20 is performed in the atmosphere. Therefore, it is possible to exert extremely excellent assembling property or manufacturability.

Next, FIGS. 8 and 9 show a suspension bush according to another embodiment of the present invention. In this embodiment, the members having the same structure as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, in the suspension bush of this embodiment, the stopper portions 32, 32 of the stopper fitting 28 are
Are respectively configured as separate members, and the first buffer rubber 38 formed by using a rubber material different from the rubber elastic body 14 forming the bush main body is vulcanized and bonded on each protruding end surface 36. Has been. The stoppers 32, 32 are integrally attached via the thin-walled cylindrical connecting sleeve 56.

Therefore, even with the bush according to the present embodiment, the stopper portion 32 that restricts the relative displacement of the inner and outer tubular metal fittings 10 and 12 when the excessive vibration load is input by the contact thereof.
On the contact surface between the
38 and the second cushioning rubber 44 are provided, and the shock absorbing function at the time of abutment thereof can be exhibited in cooperation with the first and second cushioning rubbers 38, 44. Similar to the first embodiment, the impact absorption performance can be advantageously improved while ensuring sufficient durability.

Further, particularly in the present embodiment, the first cushion rubber 38,
Since it is formed separately from the rubber elastic body 14, it also has the advantage that the desired cushioning performance can be set advantageously without being affected by the vibration damping characteristics required for the bush. Of.

Although the embodiments of the present invention have been described in detail above, this is a literal example, and the present invention should not be construed as being limited to such specific examples.

For example, as shown in FIG. 10 and FIG. 11, with respect to an intermediate portion in the projecting direction of the first buffer rubber 38 and the second buffer rubber 44, a hard material that spreads in a direction perpendicular to the projecting direction. It is also possible to dispose the intermediate plate 58 of the buffer rubbers 38 and 44 so that they are integrally fixed to each other so as to suppress the amount of strain of the buffer rubbers 38 and 44, thereby further improving the durability of the buffer rubbers 38 and 44. It can be advantageously improved.

Further, the mounting member 40 that constitutes the outer stopper member does not necessarily have to be formed in a shape that covers the openings of the pocket portion 22 and the concave groove 26 over the entire surface, and can be positioned by engaging with the concave groove 26. Anything is fine. And
When such a mounting member that does not close the pocket portion 22 is used, it is not necessary to specifically provide the through hole 46 in the mounting member.

In addition, it goes without saying that the present invention can be favorably applied not only to the suspension bush as illustrated but also to an engine mount of an automobile, an antivibration mount of various devices, and the like.

Although not listed one by one, the present invention can be carried out in variously modified, modified, improved, etc. modes based on the knowledge of those skilled in the art. Needless to say, all of them are included in the scope of the present invention without departing from the spirit of the above.

(Effect of the Invention) As is apparent from the above description, in the fluid-filled tubular mount device according to the present invention, the stopper member is arranged not only on the inner tubular metal fitting side but also on the outer tubular metal fitting side, and Since the cushioning rubber that absorbs the shock when the relative displacement of the tubular metal fitting is regulated is installed separately on the contact surface of each stopper member, the distortion amount of each cushioning rubber is suppressed and the overall Since excellent shock absorbing performance can be exhibited satisfactorily, a cylindrical mounting device having both sufficient durability and excellent shock absorbing performance at the time of displacement regulation can be advantageously realized. is there.

[Brief description of drawings]

1 is a longitudinal sectional view showing a suspension bush as an embodiment of the present invention, which is a view corresponding to a II cross section in FIG. 2, and FIG. 2 is a II- in FIG.
It is a II sectional view. FIG. 3 is a longitudinal sectional view showing an integrally vulcanized molded product which constitutes the suspension bush shown in FIG. 1, and is a view corresponding to the III-III section in FIG. FIG. 4 shows IV-IV in FIG.
FIG. 5 is a cross-sectional view showing the outer stopper member that constitutes the suspension bush shown in FIG. 1, FIG. 6 is a bottom view of FIG. 5, and FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. 5. 8 is a vertical cross-sectional view showing a suspension bush as another embodiment of the present invention, which is a view corresponding to the VIII-VIII cross section in FIG. 9, and FIG. 9 is a sectional view taken along line IX-IX in FIG. Furthermore, FIG. 10 and FIG. 11 are cross-sectional explanatory views showing an embodiment different from the above-mentioned embodiment for the inner stopper member and the outer stopper member, respectively. 10: Inner tube fitting, 12: Outer tube fitting 14: Rubber elastic body, 18: Metal sleeve 22: Pocket part, 24: Window part 26: Recessed groove, 28: Stopper fitting 32: Stopper part, 36: Projected end face 38: First buffer rubber, 40: Mounting bracket 42: Locking piece, 44: Second buffer rubber 46: Through hole, 50: Seal rubber 52: Fluid chamber, 54: Orifice passage

Claims (1)

[Scope of utility model registration request] 1. An inner tubular metal fitting, a pair of windows that are located opposite to each other in the radial direction, and a pair of recessed grooves that extend in the circumferential direction across the circumferential ends of the windows. A metal sleeve, which is disposed outside the tubular fitting at a predetermined distance, and an inner sleeve which is interposed between the inner tubular fitting and the metallic sleeve to integrally connect them, and which is opened through a window portion of the metallic sleeve. And a rubber elastic body having a pair of pockets, and projections that are integrally provided on the inner tubular metal fitting and that project from the inner tubular metal fitting side into the pocket portion at a predetermined height, respectively, and An inner stopper member having a first cushioning rubber integrally provided on the projecting end surface of the projecting portion, the inner stopper member being arranged in the window portion of the metal sleeve, and both circumferential ends being positioned by the recessed grooves. Assembled by An outer side formed by integrally projecting second cushioning rubbers on the inner peripheral surfaces of the pair of half-cylinder-shaped mounting metal fittings that face the protrusions of the stopper member. A stopper member, and an outer peripheral surface of the metal sleeve, which is externally fitted and fixed,
While holding the outer stopper member in a fixed position, liquid-tightly seal the concave groove and the opening of the pocket portion,
An outer cylindrical metal member having a seal rubber integrally formed on the inner peripheral surface, and a predetermined incompressibility formed inside the outer cylindrical metal member by sealing the opening of the pocket portion with the outer cylindrical metal member. A pair of fluid chambers in which a fluid is sealed, and an orifice passage formed in the interior of the recessed groove by sealing the opening of the recessed groove with the outer tubular metal fitting to communicate the pair of fluid chambers with each other. And a fluid-filled tubular mounting device.