JP2008133841A - Fluid-sealed cylindrical vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-sealed cylindrical vibration control device with a new structure which realizes a stopper mechanism for restricting a relative displacement amount in a rebounding direction with respect to an outer cylinder member of an inner shaft member by a simple structure with a great degree of design freedom. <P>SOLUTION: A stopper projection 18 provided so as to be projected outward orthogonally to the shaft from an inner shaft member 12 is positioned opposite an outer cylinder member 14 through a second window portion 26 provided to a position opposite to the first window portion 22 sandwiching an inner shaft member 12 in the intermediate sleeve 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cylindrical vibration isolator applied to, for example, a suspension bush or an engine mount in an automobile, and in particular, a fluid that obtains an anti-vibration effect based on a fluid action of a fluid sealed inside. The present invention relates to a sealed cylindrical vibration isolator.

  Conventionally, as described in Japanese Utility Model Laid-Open No. 64-3141 (Patent Document 1), as a type of anti-vibration coupling body or anti-vibration support body interposed between members constituting the vibration transmission system. The inner shaft member and the outer cylinder member that are spaced apart from each other in the radial direction are connected by a rubber elastic body, and pressure receiving chambers and equilibrium chambers are formed on both sides in the radial direction across the inner shaft member. There is known a fluid-filled cylindrical vibration isolator in which an equilibrium chamber is communicated with an orifice passage. In such a vibration isolator, it is possible to obtain a particularly effective vibration isolating effect in a specific frequency range based on the resonance action of the fluid flowing through the orifice passage. For example, to an engine mount or a suspension bush for an automobile. The application of is being considered.

  By the way, in such a fluid-filled cylindrical vibration isolator, there may be provided a stopper mechanism for buffering the relative displacement amount of the inner shaft member in the direction perpendicular to the axis with respect to the outer tube member.

  However, with respect to the stopper mechanism in the rebound direction in which the inner shaft member and the outer cylinder member relatively approach each other on the equilibrium chamber side, as described in, for example, JP-A-2005-265004 (Patent Document 2), A flexible rubber film constituting the wall portion of the equilibrium chamber is sandwiched between the outer cylinder members, and it may be difficult to ensure sufficient durability and load bearing performance.

  In addition, if the abutment surface of the stopper mechanism is in the equilibrium chamber, the orifice passage will be narrowed or clogged by the rubber scraps generated by repeated hits on the abutment surface, and the desired orifice effect May be difficult to fully demonstrate.

  In addition, as described in Japanese Patent No. 2990946 (Patent Document 3), a reinforcing metal fitting is embedded and disposed in a portion of the flexible rubber film where the stopper portion protruding from the inner shaft member abuts. However, the stopper clearance between the inner shaft member and the reinforcing bracket is reduced by arranging the reinforcing bracket on the inner peripheral side of the outer cylinder member, and the design of the stroke etc. until the stopper mechanism abuts. The degree of freedom is limited. In addition, when the main rubber elastic body and the flexible rubber film are integrally molded, when setting the stopper clearance between the inner shaft member constituting the stopper mechanism and the reinforcing bracket, it is necessary to ensure the mold dimensions. For this reason, since it is difficult to make the stopper clearance sufficiently small, there is a problem that the degree of freedom in designing the stopper mechanism is limited.

  Further, as described in Japanese Patent Application Laid-Open No. 4-165138 (Patent Document 4), a stopper portion projecting from an inner shaft member is passed through a flexible rubber film and directly into an outer cylinder member. It is also conceivable to bring the stopper portion into contact. However, even in such a structure, since the contact surface of the stopper mechanism is in the equilibrium chamber, there is a concern about the generation of rubber waste. In addition, the flexible rubber film is fixed to the stopper portion, so that free deformation may be hindered.

Japanese Utility Model Publication No. 64-3141 JP 2005-265004 A Japanese Patent No. 2909046 JP-A-4-165138

  Here, the present invention has been made in the background as described above, and the problem to be solved is a stopper mechanism that limits the relative displacement amount of the inner shaft member in the rebound direction with respect to the outer cylindrical member. Is to provide a fluid-filled cylindrical vibration isolator having a novel structure that can be realized with a simple structure with a high degree of design freedom.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  According to the present invention, an inner sleeve member and an intermediate sleeve spaced apart on the outer peripheral side of the inner shaft member are connected by a main rubber elastic body, and a pocket concave portion that opens to the outer peripheral surface through a first window portion formed in the intermediate sleeve is provided. A pressure receiving chamber into which vibration is input is formed by covering the first window portion with an outer cylindrical member which is provided on the main rubber elastic body and is fitted and fixed to the intermediate sleeve, while a thin wall portion is formed on the main rubber elastic body. By forming a part of the wall part with a thin wall part, an equilibrium chamber in which volume change is easily allowed is formed, and an incompressible fluid is sealed in these pressure receiving chamber and the equilibrium chamber, and the pressure receiving chamber is balanced. In a fluid-filled cylindrical vibration isolator provided with orifice passages communicating with each other, a second window portion is located at a position opposite to the first window portion with respect to the intermediate sleeve with respect to the inner shaft member. With A stopper protrusion that protrudes outward from the inner shaft member in a direction perpendicular to the axis, and the stopper protrusion is positioned opposite to the outer tube member through the second window, so that the shaft of the inner shaft member relative to the outer tube member is The present invention is characterized in that a stopper mechanism for restricting relative displacement in the perpendicular direction is configured.

  In such a fluid-filled cylindrical vibration isolator having a structure according to the present invention, the stopper protrusion provided so as to protrude outward in the direction perpendicular to the axis from the inner shaft member is the inner shaft member in the intermediate sleeve. Through the second window provided on the opposite side of the first window from the first window, the outer cylindrical member is positioned opposite to the first window. In other words, the stopper protrusion is positioned to face the outer cylinder member in the radial direction without sandwiching the thin portion of the main rubber elastic body. Therefore, it is possible to employ a mold having a structure that can be disassembled by opening the mold in the protruding direction of the stopper projection as a mold used when vulcanizing the main rubber elastic body. Accordingly, the protrusion height of the stopper protrusion, and hence the gap formed between the stopper protrusion and the outer cylinder member with which the stopper protrusion abuts (the stroke until the stopper mechanism comes into contact). That is, it is possible to ensure a large degree of freedom when designing the size of the clearance between the contact surfaces in the initial state.

  Therefore, in the fluid-filled cylindrical vibration isolator of the present invention, it is possible to ensure a large degree of freedom in designing the stopper mechanism, although the stopper mechanism has a very simple structure in which the stopper protrusion is brought into contact with the outer cylindrical member. Is possible.

  Further, in the present invention, since the stopper protrusion is brought into contact with the outer cylinder member outside the pressure receiving chamber and the equilibrium chamber, that is, outside the incompressible fluid sealing region, the stopper protrusion It is possible to prevent the orifice passage from being narrowed or clogged by rubber scraps generated due to repeated contact with the outer cylinder portion.

  Further, in the present invention, it is desirable that a slit penetrating in the axial direction is formed in the main rubber elastic body, and a stopper projection is positioned in the slit. Thereby, the peripheral area | region of a stopper protrusion part will be connected with external space through a slit. As a result, when the stopper protrusion comes into contact with the outer cylinder member, it is possible to advantageously avoid the air around the stopper protrusion from being compressed.

  Furthermore, in the present invention, it is desirable that a concave groove opening on the outer peripheral surface of the intermediate sleeve is formed, and an orifice passage is formed by covering the concave groove with an outer cylinder member. Thereby, it is not necessary to separately provide a member for forming the orifice passage, and the number of necessary parts can be reduced.

  In the present invention, the intermediate sleeve is provided with a third window portion positioned between the first window portion and the second window portion in the circumferential direction, and the third window is formed by the thin portion of the main rubber elastic body. A configuration in which the equilibrium chamber is formed by covering the portion from the inner peripheral side of the intermediate sleeve and further covering the opening on the outer peripheral side of the third window portion with the outer cylinder member is suitably employed.

  According to such a configuration, the pressure receiving chamber and the equilibrium chamber, both of which have a simple structure and excellent space by covering the window portion formed in the intermediate sleeve from the inner and outer peripheral surfaces with the main rubber elastic body and the outer cylindrical member. It can be formed with efficiency. The third window portion may be formed only on one side in the circumferential direction of the second window portion, or may be formed on both sides in the circumferential direction of the second window portion. Can be realized with even better space efficiency.

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

  1 to 3 show a suspension bush 10 as an embodiment of a fluid-filled cylindrical vibration isolator according to the present invention. The suspension bush 10 includes an inner cylinder member 12 as an inner shaft member and an outer cylinder member 14 as an outer cylinder member arranged at a predetermined distance in the radial direction, and a main body disposed therebetween. The rubber elastic body 16 is elastically connected. The suspension bush 10 is configured such that a support shaft (not shown) fixed to the suspension arm is inserted into and fixed to the inner cylinder fitting 12, while An arm eye (not shown) provided in the body is fitted and fixed so that it is interposed between the suspension arm and the body.

  In the suspension bush 10 of the present embodiment, the inner cylinder fitting 12 and the outer cylinder fitting 14 are arranged eccentrically, and a load is input under the mounting state on the automobile, and the main rubber elastic body 16 is elastically deformed. As a result, the inner cylinder fitting 12 and the outer cylinder fitting 14 are positioned on a substantially concentric axis. Further, the main vibration to be damped is input in a direction (vertical direction in FIGS. 1 to 3) substantially equal to the eccentric direction of the inner cylinder fitting 12 and the outer cylinder fitting 14. In the following description, unless otherwise indicated, the vertical direction means in principle the vertical direction in FIGS.

  More specifically, the inner cylinder fitting 12 is made of a metal material such as steel or aluminum alloy, or a hard material such as synthetic resin, and has a thick and small cylindrical shape as a whole. Further, a stopper projection 18 that projects outward in the direction perpendicular to the axis is integrally formed at the central portion in the axial direction of the inner cylindrical metal member 12. This stopper projection 18 is in a radial direction that is an input direction of a rebound load, which is one of the main loads (in FIGS. 1 and 2, the inner cylindrical member 12 is relatively downward relative to the outer cylindrical member 14. It has a block shape that protrudes greatly in the direction in which it can be displaced closer.

  Further, on the outer side in the radial direction of the inner cylinder fitting 12, a metal sleeve 20 as an intermediate sleeve surrounds the inner cylinder fitting 12 with a predetermined distance in the radial direction and being eccentric by a predetermined amount. It is arranged. As shown in FIGS. 4 to 10, the metal sleeve 20 is formed of a metal material such as an aluminum alloy or a hard material such as a synthetic resin, and has a large-diameter cylindrical shape as a whole.

  In this case, the metal sleeve 20 is formed with an upper opening window 22 as a substantially rectangular first window portion having a predetermined length in the circumferential direction at an intermediate portion in the axial direction. Preferably, the upper opening window 22 is formed so as to expand in the circumferential direction with a length of about 1/5 to 1/3.

  Further, the metal sleeve 20 is formed with a lower opening window 26 as a substantially rectangular second window portion that extends in the circumferential direction with a predetermined length at an intermediate portion in the axial direction. The lower opening window 26 is positioned in the radial direction with respect to the upper opening window 22, that is, in the eccentric direction of the inner and outer tube fittings 12, 14 which is the input direction of the static load exerted in the mounted state. It is formed at a position opposite to the upper opening window 22 across the metal fitting 12. Further, the lower opening window 26 has a circumferential dimension that is substantially the same as or smaller than that of the upper opening window 22, and is formed with substantially the same axial width dimension as the upper opening window 22.

  Furthermore, the metal sleeve 20 has a third window portion that is located at a substantially center between the circumferential direction of the lower opening window 26 on both sides in the circumferential direction of the upper opening window 22 in the axially intermediate portion thereof. A pair of intermediate opening windows 24 and 25 are formed. The pair of intermediate opening windows 24 and 25 have the same size and shape as each other, have a circumferential dimension substantially the same as or smaller than the upper and lower opening windows 22 and 26, and substantially the same as the upper and lower opening windows 22 and 26. They are formed with the same axial width dimension.

  Also, one partition vertical rail 28 that partitions one intermediate opening window 24 and lower opening window 26 in the circumferential direction, and the other intermediate partition window 25 and lower opening window 26 that partitions the other opening window 26 in the circumferential direction. Each of the partition vertical rails 30 has substantially parallel side surfaces on both sides in the circumferential direction. In the present embodiment, the side surfaces on both sides in the circumferential direction of the partition vertical bars 28 and 30 (that is, the opening end surfaces of the intermediate opening windows 24 and 25 and the lower opening window 26) are the openings of the lower opening window 26. The surface is substantially parallel to the rebound direction (that is, the radial direction in which the upper and lower opening windows 22 and 26 are opposed to each other). Thereby, the mold opening direction of the molding die at the time of vulcanization molding of the main rubber elastic body 16 is set to one radial direction (vertical direction in FIG. 1), and the opening portions of the respective opening windows 22, 24, 25, 26 are formed. Can be molded.

  Further, the metal sleeve 20 is formed with a groove 32 extending in the circumferential direction so as to open on the outer circumferential surface so as to sandwich the respective opening windows 22, 24, 25, 26 in the axial direction. For example, the concave groove 32 is formed with a length of 1/2 to 4/5 in the circumferential direction.

  A main rubber elastic body 16 is disposed between the inner cylinder fitting 12 and the metal sleeve 20. The main rubber elastic body 16 is made of a known rubber material such as natural rubber and has a thick cylindrical shape as a whole. The main rubber elastic body 16 has its inner peripheral surface vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal member 12, and its outer peripheral surface is vulcanized and bonded to the inner peripheral surface of the metal sleeve 20. As a result, as shown in FIGS. 11 to 18, it is formed as an integrally vulcanized molded product 34 including the inner cylindrical metal member 12 and the metal sleeve 20.

  Further, the main rubber elastic body 16 has an upper side in FIG. 15 which is one side of the eccentric direction (vertical direction in FIG. 15) of the inner cylindrical metal member 12 and the metal sleeve 20 (the larger separation distance in the eccentric direction). ), An upper pocket recess 36 is formed as a pocket recess. That is, the main rubber elastic body 16 has a large separation distance between the central axis of the inner cylindrical metal member 12 and the inner peripheral surface of the metal sleeve 20. In the upper side in FIG. 36 is formed. The upper pocket recess 36 is opened to the outer peripheral surface through the upper opening window 22 provided in the metal sleeve 20.

  Furthermore, the main rubber elastic body 16 is formed with a pair of intermediate pocket recesses 38 and 39 on both sides sandwiching the upper pocket recess 36 in the circumferential direction. These intermediate pocket recesses 38 and 39 are positioned in the main rubber elastic body 16 near both ends of the lower half circumference portion. One intermediate pocket recess 38 is opened to the outer peripheral surface through one intermediate opening window 24 provided in the metal sleeve 20, and the other intermediate pocket recess 39 is provided in the metal sleeve 20. It is opened to the outer peripheral surface through the other intermediate opening window 25. The inner surfaces of any of the intermediate pocket recesses 38 and 39 are set so as not to overhang when the pair of half-shaped molds are opened in the vertical direction in FIG.

  Further, the main rubber elastic body 16 is formed with a lightening hole 40 as a slit extending in the axial direction on the opposite side of the inner pocket metal fitting 12 from which the upper pocket recess 36 is formed. Has been. The lightening hole 40 is formed in the circumferential direction with a circumferential length of 1/3 to 2/3, and preferably with a circumferential length of approximately half a circumference. By forming the hollow hole 40, even when the inner and outer tube fittings 12 and 14 are arranged on the same axis in the mounted state, the portion located on the lower side in FIG. The tensile stress generated in the main rubber elastic body 16 is avoided.

  In addition, by forming such a hollow hole 40, the bottom wall portions 41 and 43 of the pair of intermediate pocket recesses 38 and 39 are thin. Thus, a flexible rubber film that is easily deformed is formed integrally with the main rubber elastic body 16. In particular, the lightening hole 40 has a shape that gives a substantially constant thickness dimension to the bottom wall portions 41 and 43 of the intermediate pocket recesses 38 and 39, respectively. It should be noted that the mold for forming the hollow hole 40 is designed so that it can be removed in the axial direction. The bottom wall portions 41 and 43 cover the intermediate opening windows 24 and 25 from the inside.

  Furthermore, a stopper projection 18 is projected from the inner cylinder fitting 12 side toward the radially outer side at the central portion of the lightening hole 40. The stopper protrusion 18 has an outer peripheral surface shape that is slightly smaller than the inner peripheral surface shape of the lower opening window 26, and the stopper protrusion 18 has a gap on the entire outer peripheral surface thereof and has a gap to the metal sleeve 20. In a state where interference is avoided, the projecting tip portion is positioned with respect to the lower opening window 26. The stopper protrusion 18 is entirely covered with a covering rubber layer 42 formed integrally with the main rubber elastic body 16, and the stopper protrusion 18 is configured by including the covering rubber layer 42. In addition, a contact surface is formed by the surface of the covering rubber layer 42, and a buffering action by the covering rubber layer 42 is exhibited at the time of contact.

  A thin seal rubber layer 44 integrally formed with the main rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface of the metal sleeve 20 over substantially the entire surface. The sealing rubber layer 44 is also vulcanized and bonded to the bottom and side surfaces of the groove 32, whereby a circumferential groove 46 extending in a smaller cross-sectional shape than the groove 32 is formed in the groove 32. 36 and a pair of intermediate pocket recesses 38 and 39 so as to extend over the outer peripheral surface. As a result, the upper pocket recess 36 and the pair of intermediate pocket recesses 38 and 39 are connected to each other by the circumferential groove 46. A plurality of seal lips 48 extending in the circumferential direction and the axial direction are integrally formed on the outer peripheral surface of the seal rubber layer 44.

  A thin-cylindrical outer cylindrical metal fitting 14 formed of a metal material such as an aluminum alloy is extrapolated to the integrally vulcanized molded product 34 of the main rubber elastic body 16 having such a structure. Further, the outer cylinder fitting 14 is fitted and fixed to the metal sleeve 20 by subjecting the outer cylinder fitting 14 to diameter reduction processing such as drawing.

  As a result, the opening portion of the upper pocket recess 36, the opening portions of the pair of intermediate pocket recesses 38 and 39, and the outer peripheral side openings of the pair of circumferential grooves 46 and 46 are fluidized by the outer cylinder fitting 14. Closely covered. As a result, a part of the wall portion is constituted by the main rubber elastic body 16 to form a pressure receiving chamber 50 in which an internal pressure fluctuation is generated when vibration is input. Further, a part of the wall part is configured by a bottom wall part 41 that can be easily deformed, and a volume change is easily allowed based on the deformation of the bottom wall part 41, and a part of the wall part Is constituted by the easily deformable bottom wall 43, and the second equilibrium chamber 54, the pressure receiving chamber 50, the first equilibrium chamber 52, and the second are easily allowed to change in volume based on the deformation of the bottom wall 43. A pair of fluid passages 56, 56 communicating with the equilibrium chamber 54 are formed.

  Accordingly, in the present embodiment, a communication passage 58 is configured by a portion of each fluid passage 56 connecting the first equilibrium chamber 52 and the second equilibrium chamber 54. The communication passages 58, 58, the first equilibrium chamber 52, and the second equilibrium chamber 54 constitute a single equilibrium chamber as a whole. As is clear from this, in the present embodiment, the bottom wall portions 41 and 43 constitute a thin portion.

  In the present embodiment, the pressure receiving chamber 50 and the equilibrium chambers 52, 54, 58, 58 are mutually connected by the portion of the fluid passages 56 that connects the pressure receiving chamber 50 and the equilibrium chambers 52, 54, 58, 58. An orifice passage 62 that communicates with each other is formed.

  Furthermore, incompressible fluid such as water, alkylene glycol, polyalkylene glycol, or silicone oil is sealed in the pressure receiving chamber 50, the equilibrium chambers 52, 54, 58, 58 and the orifice passages 62, 62. The viscosity or the like of the fluid to be sealed is not particularly limited and is appropriately determined according to the required vibration isolation characteristics and the like, but is based on the resonance action of the fluid flowing through the orifice passage 62. In order to advantageously obtain the vibration effect, a low viscosity fluid having a viscosity of 0.1 Pa · s or less is preferably employed. Further, the incompressible fluid is advantageously sealed by, for example, performing an assembly operation of the outer cylinder fitting 14 on the integrally vulcanized molded product 34 in the fluid.

  Further, as described above, when the outer cylinder fitting 14 is fitted and fixed to the integrally vulcanized molded product 34 of the main rubber elastic body 16, the lower opening window 26 provided in the metal sleeve 20 becomes the outer cylinder fitting. 14 is covered. As a result, the stopper protrusion 18 can be positioned to face the outer cylinder fitting 14 through the lower opening window 26.

  In the suspension bush 10 having such a structure, when a vibration is input in a state where the suspension bush 10 is mounted on an automobile, the relative displacement amount of the inner cylinder fitting 12 in the rebound direction with respect to the outer cylinder fitting 14 is a stopper. The protrusion 18 is limited by the contact with the outer cylinder fitting 14.

  As is clear from this, in the present embodiment, the stopper projection 18 and the outer cylinder fitting 14 constitute a stopper mechanism in the rebound direction.

  In the suspension bush 10 having such a structure, the stopper protrusion 18 is positioned to oppose the outer cylinder fitting 14 through the lower opening window 26, so that the main rubber elastic body 16 is integrally vulcanized. As a mold used when manufacturing the product 34, a mold that can be disassembled in the protruding direction of the stopper protrusion 18 can be employed. Thereby, it is possible to design the protrusion height of the stopper protrusion 18, that is, the size of the gap formed between the protrusion front end surface of the stopper protrusion 18 and the inner peripheral surface of the outer cylinder fitting 14 with a large degree of freedom. It becomes.

  Therefore, in the suspension bush 10 having the above-described structure, the stopper mechanism is designed in spite of the fact that a stopper mechanism having a very simple structure in which the stopper protrusion 18 is brought into direct contact with the outer cylinder fitting 14 is employed. A large degree of freedom can be secured.

  Further, since the stopper projection 18 is brought into contact with the outer cylinder fitting 14 outside the pressure receiving chamber 50 and the equilibrium chambers 52, 54, 58, 58, the stopper projection 18 contacts the outer cylinder fitting 14. It is possible to advantageously avoid the narrowing or clogging of the orifice passages 62 and 62 due to the rubber scrap generated due to the contact.

  Further, in the present embodiment, since the stopper projection 18 is positioned in the lightening hole 40, the air around the stopper projection 18 is compressed when the stopper projection 18 comes into contact with the outer cylinder fitting 14. This can be advantageously avoided.

  Furthermore, in the present embodiment, the outer peripheral side openings of the peripheral grooves 46 and 46 formed by attaching the seal rubber layer 44 to the bottom and side surfaces of the concave grooves 32 and 32 formed on the outer peripheral surface of the metal sleeve 20. Since the orifice passages 62 and 62 are formed by covering the outer cylinder fitting 14 with the outer cylinder fitting 14, it is not necessary to separately provide a member for forming the orifice passages 62 and 62. As a result, the number of necessary parts is reduced. It becomes possible to do.

  Further, in the present embodiment, intermediate opening windows 24 and 25 are formed in the metal sleeve 20 between the upper opening window 22 and the lower opening window 26 in the circumferential direction, and intermediate walls are formed by the bottom wall portions 41 and 43. The opening windows 24 and 25 are covered from the inner peripheral side of the metal sleeve 20, and the outer peripheral side openings of the intermediate opening windows 24 and 25 are covered by the outer cylindrical metal fitting 14, whereby the equilibrium chambers 52, 54, 58 and 58 are formed. Since the pressure receiving chamber 50 and the equilibrium chambers 52, 54, 58, 58 are all formed, the opening windows 22, 24, 25 formed in the metal sleeve 20 are arranged outside the main rubber elastic body 16. By covering from the inner and outer peripheral surfaces with the cylindrical metal fitting 14, it is possible to form with a simple structure and excellent space efficiency.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, in the embodiment, the equilibrium chamber may be configured by only one of the first equilibrium chamber 52 and the second equilibrium chamber 54. Moreover, in the said embodiment, the concave grooves 32 and 32 provided in the metal sleeve 20 may be one. Furthermore, in the embodiment, an orifice passage that connects the pressure receiving chamber and the equilibrium chamber from both sides in the circumferential direction may be provided.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

The front view which shows the suspension bush as one Embodiment of the fluid filling type | mold cylinder vibration isolator of this invention. II-II sectional drawing in FIG. III-III sectional drawing in FIG. The front view of the metal sleeve which comprises the suspension bush shown by FIG. VV sectional drawing in FIG. FIG. 5 is a top view of the metal sleeve shown in FIG. 4. VII-VII sectional drawing in FIG. The left view of the metal sleeve shown by FIG. The right view of the metal sleeve. The bottom view of the metal sleeve. The perspective view of the integral vulcanization molding product of the main body rubber elastic body which comprises the suspension bush shown by FIG. The front view which shows the integral vulcanization molded product of the main body rubber elastic body. XIII-XIII sectional drawing in FIG. The top view which shows the integral vulcanization molded product of the main body rubber elastic body shown by FIG. XV-XV sectional drawing in FIG. FIG. 12 is a left side view of an integrally vulcanized molded product of the main rubber elastic body shown in FIG. 11. The right view of the integral vulcanization molded product of the main body rubber elastic body. The bottom view of the integral vulcanization molding product of the main body rubber elastic body.

Explanation of symbols

10: Suspension bushing, 12: Inner cylinder fitting, 14: Outer cylinder fitting, 16: Main rubber elastic body, 18: Stopper projection, 20: Metal sleeve, 22: Upper opening window, 26: Lower opening window, 36: Upper pocket recess, 41: bottom wall, 43: bottom wall, 50: pressure receiving chamber, 62: orifice passage

Claims (4)

An inner shaft member and an intermediate sleeve spaced apart on the outer peripheral side of the inner shaft member are connected by a main rubber elastic body, and a pocket recess that opens to the outer peripheral surface through a first window formed in the intermediate sleeve is formed in the main rubber. A pressure receiving chamber into which vibrations are input is formed by covering the first window with an outer cylinder member that is provided on the elastic body and fitted and fixed to the intermediate sleeve, while a thin-walled portion is formed on the main rubber elastic body And forming a part of the wall part by the thin wall part to form an equilibrium chamber in which the volume change is easily allowed, and enclosing the incompressible fluid in the pressure receiving chamber and the equilibrium chamber. In a fluid-filled cylindrical vibration isolator provided with an orifice passage that communicates with the equilibrium chamber,
A stopper that protrudes outward from the inner shaft member in a direction perpendicular to the axis while providing a second window portion at a position opposite to the first window portion across the inner shaft member with respect to the intermediate sleeve. A stopper for restricting relative displacement of the inner shaft member in the direction perpendicular to the outer cylinder member with respect to the outer cylinder member by providing a protrusion and causing the stopper protrusion to oppose the outer cylinder member through the second window portion. A fluid-filled cylindrical vibration isolator characterized by comprising a mechanism.   The fluid-filled cylindrical vibration isolator according to claim 1, wherein a slit penetrating in an axial direction is formed in the main rubber elastic body, and the stopper protrusion is positioned in the slit.   A fluid-filled cylinder according to claim 1 or 2, wherein a concave groove is formed in an outer peripheral surface of the intermediate sleeve, and the orifice passage is formed by covering the concave groove with the outer cylinder member. Mold vibration isolator.   In the intermediate sleeve, a third window portion is provided between the first window portion and the second window portion in the circumferential direction, and the third portion is formed by the thin portion of the main rubber elastic body. The window portion is covered from the inner peripheral side of the intermediate sleeve, and the opening on the outer peripheral side of the third window portion is covered by the outer cylinder member to form the equilibrium chamber. 4. The fluid-filled cylindrical vibration isolator according to any one of items 1 to 3.

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