JP4896895B2 - Fluid-filled cylindrical vibration isolator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a fluid-filled cylindrical vibration isolator and a method for manufacturing a fluid-filled cylindrical vibration-proof device that obtain a vibration-proof effect based on the flow action of an incompressible fluid sealed in an internal fluid chamber. Is.

  Conventionally, as a kind of fluid-filled type vibration isolator that obtains a vibration-proof effect by using the flow action of an incompressible fluid sealed inside, for example, Patent Document 1 (Japanese Utility Model Laid-Open No. 06-30547) or There is known a fluid-filled cylindrical vibration isolator as disclosed in Patent Document 2 (Japanese Utility Model Publication No. 06-25728). In such a fluid-filled cylindrical vibration isolator, the inner shaft bracket and the metal sleeve, which are spaced apart from each other in the radial direction, are connected by the rubber elastic body of the main body, and the outer cylinder bracket is externally inserted into the metal sleeve and is fitted with a reduced diameter. The structure is fixed and fixed. Then, by covering the openings of the first and second pocket portions formed through the window portion of the metal sleeve with the outer tube fitting, the incompressible fluid is enclosed, and a relative pressure fluctuation is caused at the time of vibration input. First and second fluid chambers are formed. Furthermore, an orifice member extending in the circumferential direction across the first window is assembled, and the first fluid chamber and the second fluid chamber communicate with each other between the fitting surfaces of the orifice member and the outer tube fitting. An orifice structure in which an orifice passage is formed is preferably employed. With such an orifice structure, a large degree of freedom in tuning such as the length and cross-sectional area of the orifice passage is ensured, and the intended vibration isolation performance can be realized at a higher level.

  Conventionally, metal members such as aluminum alloys have been used as such orifice members. However, in recent years, the use of synthetic resin orifice members has been studied for the purpose of reducing the weight and cost. Yes.

  However, synthetic resin orifice members tend to be less elastic and more easily elastically deformed than metal ones. Therefore, it is necessary to mold the orifice member in consideration of a dimensional error, which has a problem of adversely affecting the manufacturing process.

  That is, for the purpose of automating the manufacturing process of the fluid-filled cylindrical vibration isolator, generally, the assembly of the orifice member to the integrally vulcanized molded product of the main rubber elastic body having the inner shaft bracket and the metal sleeve is performed in the atmosphere. Then, the assembled body is immersed in an incompressible fluid, and an outer cylinder fitting is extrapolated in the incompressible fluid and is fixed by fitting with a reduced diameter.

  However, if an orifice member made of synthetic resin is used, it is difficult to maintain the assembled state of the orifice member with respect to the integrally vulcanized molded product, and the orifice member protrudes from the integrally vulcanized molded product onto the outer peripheral surface in an incompressible fluid. There was a risk that the outer cylinder fitting would not be able to be extrapolated.

  Specifically, the orifice member is generally formed in a semi-cylindrical shape, and both end portions in the circumferential direction are formed on both sides in the circumferential direction sandwiching the first window portion in the metal sleeve of the integrally vulcanized molded product. The orifice member is fixed to the metal sleeve and the outer cylinder fitting by extrapolation of the outer cylinder fitting, and then fitted into the fitting concave groove. If it protrudes from the outer peripheral surface of the integrally vulcanized molded product, the axial end of the orifice member abuts on the outer cylinder fitting when the outer cylinder fitting is extrapolated.

  In order to deal with such a problem, for example, it is conceivable to employ an orifice member having a circumferential length of more than half a circumference and to assemble the orifice member in an integrally vulcanized molded product in a radially tightened state. However, it is difficult to make the length in the circumferential direction of the orifice member having the orifice groove on the outer peripheral surface more than half a circumference for the reason of removing the molding die.

  Further, it is conceivable to fix both ends of the orifice member in the circumferential direction to the integrally vulcanized molded product, but this is not practical in consideration of molding accuracy of the synthetic resin material and expansion / contraction due to temperature change.

  In addition, if the diameter dimension of the orifice member is smaller than the diameter dimension of the fitting groove of the metal sleeve, the orifice member can be assembled by being elastically deformed, but it will be detached from the metal sleeve due to the elasticity of the orifice member. It becomes. Therefore, the diameter dimension of the orifice member needs to be set slightly larger than the diameter dimension of the metal sleeve in consideration of molding accuracy of the synthetic resin, thermal deformation, and the like. For this reason, when the orifice member is assembled into an integrally vulcanized molded product, both ends in the circumferential direction of the orifice member protrude radially outward from the fitting groove of the metal sleeve, and this is the case when the outer cylinder fitting is extrapolated. There were circumstances that made it more difficult to solve the problem.

Japanese Utility Model Publication No. 06-30547 Japanese Utility Model Publication No. 06-25728

  Here, the present invention has been made in the background as described above, and the problem to be solved is that when the outer cylindrical member is mounted on the intermediate sleeve, the orifice member is disposed on the inner side of the intermediate sleeve. The fluid-filled cylindrical vibration-proof device and the fluid-filled cylindrical anti-vibration device have a novel structure that can provide excellent mounting workability and improve manufacturing efficiency. It is to provide a novel manufacturing method of a vibration device.

  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. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, the present invention is characterized in that an inner shaft member is sandwiched in a direction perpendicular to the axis in an integrally vulcanized molded product in which an inner shaft member and an intermediate sleeve spaced apart on the outer peripheral side thereof are connected by a main rubber elastic body. A first pocket portion and a second pocket portion are formed on both sides, and the first pocket portion and the second pocket portion are formed in the intermediate sleeve, respectively. Are formed on the outer peripheral surface of the intermediate sleeve, and are formed with recessed grooves extending in the circumferential direction on both sides of the first sleeve portion in the circumferential direction. The semi-cylindrical orifice member is disposed across the opening of the first pocket portion in the circumferential direction, and both end portions in the circumferential direction of the orifice member are respectively fitted into the fitting concave grooves and assembled. , The outer pocket member is extrapolated and reduced in diameter to the integrally vulcanized molded product with the refis member assembled, and is fitted and fixed to the intermediate sleeve, so that the first pocket portion and the second pocket portion are fluid-tightly covered. Thus, a first fluid chamber and a second fluid chamber, each of which is filled with an incompressible fluid, are formed, and between the outer peripheral surface of the orifice member and the intermediate sleeve, the first fluid chamber and the second fluid chamber are formed. In the fluid-filled cylindrical vibration isolator in which orifice passages are formed to communicate with each other in the fluid chamber, both ends in the axial direction at both ends in the circumferential direction of the orifice member are left in the circumferential direction, leaving inner peripheral edge portions, respectively. A concave portion extending in a circumferential direction from the portion is formed, and an engagement inner circumferential protrusion is formed on the inner circumferential side of each concave portion so as to extend the inner peripheral edge of the orifice member in the circumferential direction. In vulcanized molded products In the fitting groove, elastic engagement protrusions are formed on the inner surfaces of both walls in the groove width direction, and each elastic engagement protrusion is in contact with each concave portion at both circumferential ends of the orifice member. In the fluid-filled cylindrical vibration isolator that is compressed and deformed.

  In such a fluid-filled cylindrical vibration isolator having a structure according to the present invention, the elastic engagement protrusion of the integrally vulcanized molded product is in the groove width direction of the fitting groove with respect to the concave portion of the orifice member ( It is assembled in a state of being compressed and deformed in the axial direction of the orifice member. As a result, the orifice member is prevented from coming out of the fitting groove and is assembled to the integrally vulcanized molded product.

  Moreover, even if both circumferential ends of the orifice member are about to come out radially outward from the fitting concave groove of the integral vulcanized molded product, the engagement inner peripheral protrusion of the orifice member is elastically engaged with the integral vulcanized molded product. By locking the protrusions in the radial direction, the protrusions from the fitting grooves at both ends in the circumferential direction are prevented from protruding radially outward. That is, according to this structure, the orifice member is stably assembled inside the intermediate sleeve in the integrally vulcanized molded product.

  Therefore, when the outer cylinder member is extrapolated to the intermediate sleeve, the axial end portion of the orifice member is prevented from coming into contact with the outer cylinder member and obstructing it. Therefore, the manufacturing efficiency can be improved.

  Further, the present invention is characterized in that (a) the main rubber elastic body is vulcanized and bonded to the inner shaft member and the intermediate sleeve spaced apart on the outer peripheral side, and the inner shaft member is perpendicular to the axis. A first pocket portion and a second pocket portion that open to the outer peripheral surface through the first window portion and the second window portion formed in the intermediate sleeve are formed on both sides of the sandwiched sleeve, respectively, and the first pocket portion in the intermediate sleeve is further formed. The fitting grooves are formed on both sides of the window in the circumferential direction, and are fitted with elastic engagement protrusions on the inner surfaces of both walls in the groove width direction of the fitting grooves. And (b) having a semi-cylindrical shape and having an orifice groove formed on the outer peripheral surface, while leaving the inner peripheral edge portion on both axial end surfaces of the circumferential end portions, respectively. Circumferential direction from both circumferential ends Prepared by forming a synthetic resin material with an orifice member formed with a concave portion extending at a predetermined length and formed with an inner peripheral protrusion of the orifice member extending in the circumferential direction inside the concave portion. And (c) attaching an orifice member to the integrally vulcanized molded product, and mounting the orifice member so as to straddle the opening of the first pocket portion of the integrally vulcanized molded product in the circumferential direction. The both ends in the circumferential direction are fitted into the respective fitting concave grooves of the integrally vulcanized molded product, and the respective elastic engagement protrusions in the integrally vulcanized molded product with respect to the respective concave portions in the circumferential both ends of the orifice member. By contacting the part in a compressed deformation state and preventing deformation of the orifice member in the radial direction at both ends in the circumferential direction by engaging action of each elastic engagement protrusion to each engagement inner peripheral protrusion, Orientation for integrally vulcanized molded products A step of obtaining an assembly of a rubber member, (d) a step of preparing a metal outer cylinder member having a cylindrical shape, and (e) an assembly of an orifice member for an integrally vulcanized molded product. After immersing in the fluid and extrapolating the outer cylinder member to the integral vulcanization molded product in an incompressible fluid, the outer cylinder member is reduced in diameter and fitted and fixed to the intermediate sleeve of the integral vulcanization molded product As a result, the first pocket portion and the second pocket portion in the integrally vulcanized molded product are fluid-tightly covered to form the first fluid chamber and the second fluid chamber in which the incompressible fluid is sealed, respectively. And a step of covering the orifice groove of the orifice member to form an orifice passage that connects the first fluid chamber and the second fluid chamber to each other.

  According to such a method of the present invention, as described in the above-mentioned fluid-filled cylindrical vibration isolator, both ends in the circumferential direction of the orifice member are displaced radially outward from the fitting concave grooves of the intermediate sleeve. The elastic engagement protrusions and the inner periphery engagement protrusions, the first and second fluid chambers, and the like that are locked when the operation is performed are realized with a small and simple manufacturing process. Therefore, the cost can be effectively reduced as a result of achieving the intended improvement in manufacturing efficiency without increasing special processing steps and parts.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIGS. 1 and 2 show an automobile cab mount 10 as an embodiment of the fluid-filled cylindrical vibration isolator of the present invention. In the cab mount 10 for an automobile, an inner cylinder fitting 12 as an inner shaft member and an outer cylinder fitting 14 as an outer cylinder member are disposed at a predetermined distance in the radial direction and are interposed therebetween. The main rubber elastic body 16 is elastically connected. The inner cylinder fitting 12 and the outer cylinder fitting 14 are attached to a cabin and a vehicle body frame (not shown), respectively, so that the cabin is supported in a vibration-proof manner with respect to the vehicle body frame.

  The inner cylinder fitting 12 and the outer cylinder fitting 14 are slightly eccentrically arranged, and the body rubber elastic body 16 is elastically deformed due to the weight of the vehicle body frame in the mounted state, whereby the inner and outer cylinder fittings 12 and 14. Are arranged so as to be substantially coaxial, and main vibrations to be vibration-proofed are input in a substantially eccentric direction (vertical direction in FIG. 1) of the inner and outer cylindrical fittings 12 and 14.

  More specifically, the inner cylinder fitting 12 has a small-diameter cylindrical shape, and a stopper 18 that protrudes in one radial direction (upward in FIGS. 1 and 2) is provided at an axially intermediate portion thereof. It has been. The stopper 18 is formed using a rigid member made of a hard synthetic resin material or a metal material. A metal sleeve 20 having a large-diameter cylindrical shape as an intermediate sleeve is disposed on the radially outer side of the inner cylinder fitting 12 and the stopper 18 at a predetermined distance and slightly eccentric from the inner cylinder fitting 12. Yes.

  In the metal sleeve 20, first window portions 22, 22 are provided on the side where the eccentric distance from the inner cylinder fitting 12 is small, and the separation distance in the eccentric direction from the inner cylinder fitting 12 is large. A second window 24 is provided on the side. The first window portions 22 and 22 each have a substantially rectangular shape that extends in the circumferential direction in the axial direction intermediate portion of the metal sleeve 20 with a length of a little less than ¼ circumference. Further, the second window portion 24 has a substantially rectangular shape that extends in the circumferential direction in the axial direction intermediate portion of the metal sleeve 20 with a length of a little less than a half circumference.

  Between the circumferential direction of the 1st window parts 22 and 22 and the 2nd window part 24 in the metal sleeve 20, an axial direction intermediate part is recessed by predetermined width, and a pair of fitting recessed groove 26a extended in the circumferential direction, 26b is formed. Similarly, between the circumferential directions of the first window portions 22, 22, an intermediate portion in the axial direction is recessed with a predetermined width to form a fitting groove 27 extending in the circumferential direction.

  A main rubber elastic body 16 having a substantially cylindrical shape is interposed between the radially facing surfaces of the metal sleeve 20 and the inner cylindrical metal member 12, and the inner peripheral surface of the main rubber elastic body 16 is the outer periphery of the inner cylindrical metal member 12. While being vulcanized and bonded to the surface, the outer peripheral surface of the main rubber elastic body 16 is vulcanized and bonded to the inner peripheral surface of the metal sleeve 20. As a result, as shown in FIGS. 3 to 11, the inner cylinder fitting 12 and the metal sleeve 20 are integrally vulcanized and molded with the main rubber elastic body 16, and are connected to each other by the main rubber elastic body 16. A vulcanized product 28 is formed.

  A pair of fitting rubbers 30, 30 are provided on both wall portions in the groove width direction (left and right in FIGS. 6 and 7) of the fitting grooves 26 a, 26 b of the metal sleeve 20 in the integrally vulcanized molded product 28. ing. These fitting rubbers 30 and 30 are integrally formed with the main rubber elastic body 16, extend in the circumferential direction along both wall portions in the groove width direction, and extend from both walls to the inside in the groove width direction. Projecting inward in the axial direction, and opposed to each other at a predetermined distance in the axial direction (groove width direction).

  The main rubber elastic body 16 of the integrally vulcanized molded product 28 is provided with a concave first pocket portion 32 and a second pocket portion 34 having a substantially rectangular shape when viewed in the direction perpendicular to the axis. The pocket portion 32 opens to the outer peripheral surface through the first window portion 22 of the metal sleeve 20, and the second pocket portion 34 opens to the outer peripheral surface through the second window portion 24 of the metal sleeve 20. Yes. At the center of the bottom of the second pocket portion 34, a stopper 18 fixed to the inner cylindrical metal fitting 12 is projected. On the outer peripheral surface of the stopper 18, a thin buffer rubber layer integrally formed with the main rubber elastic body 16 is formed so as to cover substantially the whole. The stopper 18 is positioned to face the outer cylinder fitting 14 in the eccentric direction (up and down in FIG. 1) of the inner cylinder fitting 12 and the outer cylinder fitting 14 in accordance with the fitting and fixing of the outer cylinder fitting 14 to the metal sleeve 20 described later. It is done. Thus, when a large vibration is inputted in one radial direction (up and down in FIG. 1) with the cab mount 10 for an automobile mounted on the automobile, the inner cylinder fitting 12 is provided with the stopper 18 and the buffer rubber layer. By abutting on the outer cylinder fitting 14 via the inner and outer cylinder fittings 14, the displacement of the inner and outer cylinder fittings 12, 14 in one radial direction is limited in a buffering manner.

  Further, between the first pocket portion 32 and the radially opposing surface of the inner cylindrical metal member 12 in the main rubber elastic body 16, the main rubber elastic body 16 extends in the axial direction with a substantially constant cross-sectional shape and penetrates both end faces of the main rubber elastic body 16. A slit 36 is formed. An orifice member 38 is assembled to such an integrally vulcanized molded product 28.

  As shown in FIGS. 12 to 16, the orifice member 38 has a substantially semi-cylindrical shape. In this embodiment, the manufacturing cost, weight reduction, corrosion resistance, durability, strength, moldability, In consideration of dimensional accuracy and the like, for example, it is formed using a synthetic resin material such as polyethylene or nylon. An orifice groove 40 extending in the circumferential direction is formed on the outer peripheral surface of the orifice member 38 in a cross section that opens in a concave shape toward the outer side in the radial direction. One end portion of the orifice groove 40 opens at one end edge of the orifice member 38 in the circumferential direction (left in FIG. 12), and the other end portion of the orifice groove 40 extends around the orifice member 38. It opens to the inside of the orifice member 38 through a communication hole 42 formed through the wall on the other end side in the direction. In addition, a hollow recess 44 having an appropriate size is formed on the outer peripheral surface of the orifice member 38 excluding the formation site of the orifice groove 40. Furthermore, a notch-shaped positioning recess 46 is formed at one end in the circumferential direction of the orifice member 38 so as to open at the edge in the width direction and the circumferential direction.

  In particular, in this embodiment, when the orifice member 38 is formed, the radius of curvature of the orifice member 38 and the radius of curvature of the bottom of the fitting groove 26 in the metal sleeve 20 are set to be the same. In consideration of the molding accuracy and thermal deformation of the orifice member 38, the radius of curvature of the orifice member 38 is the bottom of the fitting groove 26 before the orifice member 38 is assembled to the integrally vulcanized molded product 28. It may be larger or smaller than the radius of curvature.

  As shown in FIG. 17, such an orifice member 38 is fitted from the radially outer side on the first pocket portion 32 side of the integrally vulcanized molded product 28 toward the first pocket portion 32. The inner circumferential surfaces on both sides in the circumferential direction of the orifice member 38 are superimposed on the bottom surfaces of the respective fitting grooves 26 of the metal sleeve 20, and both ends in the width direction on both sides in the circumferential direction of the orifice member 38 are fitted in the respective fittings. It is sandwiched between a pair of fitting rubbers 30, 30 of the fitting groove 26, and is clamped and fixed in the groove width direction of the fitting groove 26 based on the elasticity of the fitting rubber 30.

  Accordingly, the orifice member 38 is assembled along the circumferential direction of the integrally vulcanized molded product 28 so as to be fitted inside the first pocket portion 32 across the pair of fitting concave grooves 26a and 26b in the circumferential direction. Thus, an assembly 48 as shown in FIGS. 18 and 19 is formed. The fitting rubber 30 of one fitting groove 26 in the integrally vulcanized molded product 28 is provided with a positioning projection 50 having a shape corresponding to the positioning recess 46 of the orifice member 38. 50 is fitted in the positioning recess 46 and the orifice member 38 is assembled to the integral vulcanization molded article 28, whereby the assembly position of the orifice member 38 with respect to the integral vulcanized molded article 28 is determined.

  The outer cylinder 14 is assembled to the assembly 48. The outer cylinder fitting 14 has an approximately cylindrical shape with a large diameter, and is formed using an iron-based metal material that can be reduced in diameter in the radial direction. In addition, a thin seal rubber layer 52 is formed on the inner peripheral surface of the outer cylindrical metal member 14 over the entire surface.

  The outer cylinder fitting 14 is extrapolated to the assembly 48, and the outer cylinder fitting 14 is reduced in diameter by being subjected to diameter reduction processing such as an eight-way drawing to the outer cylinder fitting 14, so that the inner cylinder fitting 14 has an inner diameter. The peripheral surface is overlapped with the outer peripheral surfaces of the integrally vulcanized molded product 28 and the orifice member 38 in the assembly 48 with the seal rubber layer 52 interposed therebetween. Thereby, the outer cylinder fitting 14 is fitted and fixed to the assembly 48 and is elastically connected to the inner cylinder fitting 12 via the main rubber elastic body 16. Further, the first pocket portion 32 and the second pocket portion 34 are covered with the outer tubular metal fitting 14 fluid-tightly via the seal rubber layer 52.

  A first fluid chamber defined by the first pocket portion 32 and the outer cylinder fitting 14 is provided between the radially opposing surfaces of the inner cylinder fitting 12 and the outer cylinder fitting 14 on the side where the separation distance in the eccentric direction is small. 54 is formed, and a second fluid chamber 56 defined by the second pocket portion 34 and the outer cylindrical fitting 14 is formed on the side where the separation distance in the eccentric direction is large. Incompressible fluid is sealed in the first fluid chamber 54 and the second fluid chamber 56. For example, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is employed as the incompressible fluid to be enclosed. In order to effectively obtain a vibration isolation effect based on a fluid action such as a resonance action of the fluid. It is desirable to employ a low viscosity fluid of 0.1 Pa · s or less. Encapsulation of the incompressible fluid into the first and second fluid chambers 54 and 56 is preferably realized by, for example, assembling the assembly 48 and the outer cylindrical fitting 14 in the incompressible fluid. . A part of the wall portions of the first and second fluid chambers 54 and 56 are both composed of the main rubber elastic body 16, and the first and second fluid chambers 54 and 56 include inner cylinder fittings. Based on the elastic deformation of the main rubber elastic body 16 due to the relative displacement between the outer sleeve 12 and the outer tube fitting 14, pressure fluctuations are generated.

  In addition, the orifice passage 58 is formed by covering the opening of the orifice groove 40 in the orifice member 38 with the outer cylinder fitting 14 as the outer cylinder fitting 14 is assembled to the assembly 48. One end of the orifice passage 58 is connected to the second fluid chamber 56 through an opening opened in the circumferential end surface of the orifice member 38, and the other end of the orifice passage 58 is connected to the orifice member 38. The first fluid chamber 54 is connected through a communication hole 42 penetrating the peripheral wall portion. As a result, the first fluid chamber 54 and the second fluid chamber 56 are communicated with each other through the orifice passage 58 so that fluid flow through the orifice passage 58 is allowed between the two chambers 54 and 56. It has become. Based on the design change such as the passage length and the passage cross-sectional area of the orifice passage 58, the resonance frequency of the fluid that flows through the orifice passage 58 is effective against the vibration to be damped (high vibration effect). It is tuned so that the damping effect is demonstrated.

  In this case, elastic fitting protrusions 60 are provided on the fitting rubbers 30, 30 fixed to both wall portions in the groove width direction of the fitting groove 26. The elastic engagement protrusion 60 is integrally formed with the fitting rubber 30 and the main rubber elastic body 16, and is positioned radially outward from the bottom of the fitting groove 26 so as to extend in the groove width direction. Projects inward. In particular, in this embodiment, the elastic engagement protrusions 60 have a tapered shape such as a substantially hemispherical shape or a substantially truncated cone shape, and a plurality of (this embodiment) are spaced apart in the circumferential direction of the fitting groove 26. Then, two are provided for each fitting rubber 30.

  On the other hand, on both end surfaces in the axial direction at both ends in the circumferential direction of the orifice member 38, a predetermined length (in the present embodiment, the orifice member 38 in the circumferential direction) from the end edge in the circumferential direction leaves the inner peripheral edge. A concave portion 62 extending at a circumference of 1/20 to 1/4) is formed. That is, the concave portion 62 opens at the circumferential edge and the outer circumferential edge of the orifice member 38, and the width dimension in the axial direction is made smaller at the circumferential both ends of the orifice member 38 than at the circumferential central portion. A stepped shape is given. In addition, the recessed part 62 formed in the axial direction end surface in which the positioning recess 46 of the orifice member 38 is provided extends from the circumferential end edge of the positioning recess 46 toward the inner side in the circumferential direction. Further, groove portions 65 that are chamfered are formed on the outer peripheral edge portions of both end portions in the axial direction in the intermediate portion in the circumferential direction of the orifice member 38.

  Furthermore, on the inner peripheral side of each concave portion 62, an engagement inner peripheral protrusion 64 is formed extending in the circumferential direction on the inner peripheral edge of the orifice member 38. That is, the engagement inner peripheral protrusion 64 includes the inner peripheral edge of the orifice member 38 and the radially inner peripheral wall of the concave portion 62, and rises outward in the axial direction from the concave portion 62 of the orifice member 38. Thus, it is comprised by the thin curved plate-shaped part extended in the circumferential direction.

  As shown in FIG. 20, in the form in which the inner peripheral surfaces of both ends in the circumferential direction of the orifice member 38 are superimposed on the bottom surface of the fitting groove 26 when the integrally vulcanized molded product 28 and the orifice member 38 are assembled. Further, the engagement inner peripheral protrusion 64 of the orifice member 38 is positioned radially inward from the elastic engagement protrusion 60 of the integrally vulcanized molded product 28 and is opposed to the elastic engagement protrusion 60 in the radial direction. I'm hurt. In other words, the engagement inner peripheral protrusion 64 is inserted between the bottom surface of the fitting groove 26 and the radially opposing surface of the elastic engagement protrusion 60. FIG. 20 is a schematic model diagram, and illustration of the bottom surface of the fitting groove 26 is omitted. Further, behind the elastic engagement protrusions 60, both side walls in the width direction of the fitting grooves 26 in the metal sleeve 20 are reserved. Both side walls of the fitting grooves 26 are also shown in FIG. The illustration is omitted.

  Further, in a form in which both ends in the circumferential direction of the orifice member 38 are clamped in the axial direction by the pair of fitting rubbers 30, 30 of the respective fitting concave grooves 26, the respective elastic engagement protrusions 60 are each of the concave portions 62. It is contact | abutted by the axial direction with respect to the bottom face, and is compressively deformed by the axial direction.

  The automobile cab mount 10 according to the present embodiment is suitably realized using, for example, a specific example of a method for manufacturing a fluid-filled cylindrical vibration isolator described below.

  That is, the inner cylinder fitting 12 and the metal sleeve 20 are integrally vulcanized and molded by the main rubber elastic body 16, and the fitting rubber 30 and the elastic engagement protrusion 60 integrally formed with the main rubber elastic body 16 are formed on the metal sleeve 20. An integrally vulcanized molded product 28 provided in the fitting groove 26 is prepared.

  In addition, the orifice groove 38 and the like are formed on the outer peripheral surface of the semi-cylindrical shape, and the orifice member 38 having the concave portions 62 and the engaging inner peripheral protrusions 64 formed on both axial end surfaces of the semi-cylindrical circumferential ends. prepare. In the present embodiment, the orifice member 38 is formed by molding using a synthetic resin material. However, the concave portion 62 and the engagement inner peripheral projection 64 are formed in the direction of releasing the mold when the orifice member 38 is molded. In view of the above, the shape and size are such that do not hinder demolding.

  Then, the orifice member 38 is assembled to the integrally vulcanized molded product 28, and the orifice member 38 is mounted so as to straddle the opening of the first pocket portion 32 in the integrally vulcanized molded product 28. Both ends in the circumferential direction of 38 are fitted into the respective fitting grooves 26 of the integrally vulcanized molded product 28. At the same time, the elastic engagement protrusions 60 in the integrally vulcanized molded product 28 are brought into contact with the concave portions 62 at both ends in the circumferential direction of the orifice member 38 in a compressed deformation state, so that both end portions in the circumferential direction of the orifice member 38 are compressed. Deformation in the diameter increasing direction is prevented by the engaging action of each elastic engaging protrusion 60 to each engaging inner peripheral protrusion 64. Thereby, the assembly 48 of the orifice member 38 with respect to the integral vulcanization molded product 28 is obtained.

  Moreover, the outer cylinder metal fitting 14 by which the sealing rubber layer 52 was attached to the cylindrical inner peripheral surface is prepared.

  The assembly 48 is dipped in an incompressible fluid and shaken as necessary to release air remaining between the members of the assembly 48 and the like. Then, after the outer cylinder fitting 14 is extrapolated to the integral vulcanization molded product 28 of the assembly 48 in an incompressible fluid, the outer cylinder fitting 14 is reduced in diameter to form the metal sleeve 20 of the integral vulcanization molded article 28. Fit and fix. Accordingly, the first pocket portion 32 and the second pocket portion 34 in the integrally vulcanized molded product 28 are covered fluid-tightly, and the first fluid chamber 54 and the second fluid are respectively sealed in the incompressible fluid. The chamber 56 is formed and the orifice groove 40 of the orifice member 38 is covered to form the orifice passage 58. Thereby, the cab mount 10 for automobiles of this embodiment is implement | achieved.

  Therefore, in the automobile cab mount 10 having the above-described structure, the elastic engagement protrusion 60 of the integrally vulcanized molded product 28 is in the groove width direction of the fitting groove 26 with respect to the concave portion 62 of the orifice member 38. As a result, the orifice member 38 is prevented from coming out of the fitting groove 26 outwardly.

  In addition, even if both end portions in the circumferential direction of the orifice member 38 are about to come out radially outward from the fitting groove 26 of the integrally vulcanized molded product 28, the engaging inner peripheral protrusion 64 of the orifice member 38 is integrally vulcanized. The elastic engagement protrusion 60 of the product 28 is locked in the radial direction. Thereby, the protrusion to the radial direction outward from the fitting ditch | groove 26 in the circumferential direction both ends of the orifice member 38 is prevented.

  In particular, in this embodiment, the orifice member 38 is formed using a synthetic resin material, and is further used as a fluid-filled cylindrical vibration isolator in a relatively large automobile cab mount 10. It is unavoidable that the influence of the dimensional error with the fitting concave groove 26 of the integrally vulcanized molded product 28 due to the molding accuracy of the member 38, thermal deformation, and the like tends to increase.

  Therefore, in the present embodiment, when the orifice member 38 and the integrally vulcanized molded product 28 are fitted, the compression deformation of the elastic engagement protrusion 60 as described above, and the elastic engagement protrusion 60 and the engagement inner protrusion 64 is employed, so that even if the dimensional error of the orifice member 38 is large, the integral vulcanization molded product 28 of the orifice member 38 is radially outwardly moved. Protrusion is prevented.

  In particular, since the engagement mechanisms of the elastic engagement protrusions 60 and the engagement inner protrusions 64 are provided on both end surfaces in the axial direction at both ends in the circumferential direction of the orifice member 38, the end portions in the circumferential direction of the orifice member 38. The possibility that the orifice member 38 protrudes radially outward from the fitting concave groove 26 only on one side in the axial direction and is displaced with respect to the integrally vulcanized molded product 28 and assembled is avoided.

  Therefore, when the outer cylinder fitting 14 is extrapolated to the metal sleeve 20, the axial end of the orifice member 38 is prevented from coming into contact with the outer cylinder fitting 14 to be an obstacle, and as a result, excellent. The mounting workability can be obtained, and the production efficiency can be improved.

  In the present embodiment, the engagement inner peripheral protrusion 64 is integrally formed with the orifice member 38, and the elastic engagement protrusion 60 is integrally formed with the main rubber elastic body 16 of the integral vulcanization molded product 28. Therefore, the manufacturing process can be shortened and the number of parts can be prevented from increasing, and the cost can be reduced.

  Further, by adopting the manufacturing method of the automobile cab mount 10 as illustrated, the engagement inner peripheral protrusion 64, the elastic engagement protrusion 60, the first and second fluid chambers 54, 56, and the like are formed. It becomes easy and the production efficiency can be further improved.

  The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, and improvements based on the knowledge of those skilled in the art. Needless to say, any of these embodiments can be included in the scope of the present invention without departing from the spirit of the present invention.

  For example, the shape, size, structure, number, arrangement, etc. of the integrally vulcanized molded product 28, the orifice member 38, the first and second fluid chambers 54, 56, the orifice passage 58, the concave portion 62, etc. It is not limited to what is illustrated.

  Specifically, in the above-described embodiment, the engagement inner circumferential protrusion 64 is integrally formed with the orifice member 38, and the elastic engagement protrusion 60 is integrally formed with the main rubber elastic body 16 of the integral vulcanization molded product 28. However, these engagement inner peripheral protrusions and elastic engagement protrusions may be formed separately from the orifice member and the main rubber elastic body, respectively.

  For example, as shown in Japanese Utility Model Laid-Open No. 06-30547, an orifice member is disposed across the pocket portion on the equilibrium chamber side (the side corresponding to the second fluid chamber in the embodiment). It is also applicable to cases.

  It is also possible to employ a pair of semi-cylindrical orifice members, which are assembled to the integrally vulcanized product from both sides in the radial direction, so that a cylindrical orifice assembly as a whole is employed. Even in that case, it is possible to employ the engagement structure of the elastic engagement protrusion and the engagement inner peripheral protrusion according to the present invention in the assembly portion of at least one of the orifice members and the fitting concave groove. .

  Further, for example, as described in Japanese Utility Model Publication No. 06-25728, when forming the pocket portion and the fluid chamber, a fixing fitting is added to the opening peripheral portion of the bag-shaped body made of a flexible film. It is also possible to form a fluid chamber between the metal sleeve and the metal sleeve by supporting the fitting with the metal sleeve and the outer tube fitting by fitting and fixing in the radial direction. .

  In addition, in the above-described embodiment, specific examples of applying the present invention to an automobile cab mount have been described. However, the present invention is not limited to an automobile, other than an automobile engine mount, body mount, differential mount, suspension member mount, and the like. Any of the various vibration bodies can be applied to the fluid-filled cylindrical vibration isolator.

It is a cross-sectional view of the cab mount for automobiles as one embodiment of the present invention, and corresponds to the II cross section of FIG. The longitudinal cross-sectional view of the cab mount for the said motor vehicles. The perspective view of the integral vulcanization molded product which comprises a part of cab mount for the vehicles. The front view of the same body vulcanization molded product. The rear view of the same body vulcanization molded product. The right view of the same body vulcanization molded product. The left view of the same body vulcanization molded product. VIII-VIII sectional drawing of FIG. IX-IX sectional drawing of FIG. The bottom view of the same body vulcanization molded product. XI-XI sectional drawing of FIG. The bottom view of the orifice member which comprises a part of cab mount for the vehicles. The left view of the orifice member. The right view of the same orifice member. XV-XV sectional drawing of FIG. XVI-XVI sectional drawing of FIG. The cross-sectional view which shows one manufacturing process of the cab mount for the vehicles. The right view of the assembly which comprises a part of cab mount for the said motor vehicles. The left view of the assembly which comprises a part of cab mount for the vehicles. The cross-sectional view which expands and shows the principal part of the cab mount for the said cars like a model.

Explanation of symbols

10: cab mount for automobile, 12: inner cylinder fitting, 14: outer cylinder fitting, 16: main rubber elastic body, 20: metal sleeve, 28: integral vulcanized molded product, 22: first window, 24: first Second window portion, 26: fitting groove, 32: first pocket portion, 34: second pocket portion, 38: orifice member, 54: first fluid chamber, 56: second fluid chamber, 58 : Orifice passage, 60: Elastic engagement protrusion, 62: Concave part, 64: Engagement inner protrusion

Claims (2)

In an integrally vulcanized molded article in which an inner shaft member and an intermediate sleeve spaced apart on the outer peripheral side thereof are connected by a main rubber elastic body, a first pocket portion and a second pocket are formed on both sides of the inner shaft member sandwiched in a direction perpendicular to the axis. Two pocket portions are formed, and the first pocket portion and the second pocket portion are opened to the outer peripheral surface through the first window portion and the second window portion formed in the intermediate sleeve, respectively. In addition, fitting concave grooves extending in the circumferential direction are formed on both sides of the intermediate sleeve across the first window portion in the circumferential direction, and a semi-cylindrical orifice is formed with respect to the integrally vulcanized molded product. A member is disposed across the opening of the first pocket portion in the circumferential direction, and both end portions in the circumferential direction of the orifice member are respectively fitted into the fitting concave grooves and assembled. The member is assembled The outer tubular member is extrapolated and reduced in diameter to the integrally vulcanized molded product, and is fitted and fixed to the intermediate sleeve, so that the first pocket portion and the second pocket portion are fluid-tight. A first fluid chamber and a second fluid chamber, which are covered and filled with an incompressible fluid, are formed, and between the outer peripheral surface of the orifice member and the intermediate sleeve, the first fluid chamber is formed. In a fluid-filled cylindrical vibration isolator in which an orifice passage is formed to communicate with the second fluid chamber.
On both end surfaces in the axial direction at both end portions in the circumferential direction of the orifice member, concave portions extending from the circumferential end portion with a predetermined length in the circumferential direction are formed, leaving the inner peripheral edge portion, and the inner circumference of each concave portion On the side, an engaging inner peripheral protrusion is formed extending in the circumferential direction on the inner peripheral edge of the orifice member, and the inner surfaces of both walls in the groove width direction are formed in the fitting grooves in the integrally vulcanized molded product. The elastic engagement protrusions are formed on the first and second elastic engagement protrusions, and the elastic engagement protrusions are brought into contact with the concave portions at both ends in the circumferential direction of the orifice member to be compressed and deformed. Fluid-filled cylindrical vibration isolator. A rubber elastic body of the main body is vulcanized and bonded to the inner shaft member and an intermediate sleeve that is spaced apart from the outer peripheral side of the inner shaft member, and the intermediate sleeve is formed on the both sides of the inner shaft member in a direction perpendicular to the axis. The first pocket portion and the second pocket portion that open to the outer peripheral surface through one window portion and the second window portion are formed, and both sides of the intermediate sleeve sandwiching the first window portion in the circumferential direction Forming an integral vulcanization molded article in which elastic engagement protrusions are formed on the inner surfaces of both walls in the groove width direction of each of the engagement grooves,
It has a semi-cylindrical shape, and orifice grooves are formed on the outer peripheral surface, while the inner peripheral edge portion is left on each end surface in the axial direction at both end portions in the circumferential direction, with a predetermined length in the circumferential direction from both ends in the circumferential direction. A step of forming and preparing an orifice member made of a synthetic resin material in which an extending concave portion is formed, and an inner peripheral edge of the orifice member extending in the circumferential direction is formed inside each concave portion. When,
The orifice member is assembled to the integrally vulcanized molded product, the orifice member is mounted so as to straddle the opening of the first pocket portion in the integrally vulcanized molded product, and the orifice member The both ends of the circumferential direction are fitted into the respective fitting concave grooves of the integrally vulcanized molded product, and the concave portions of the orifice member in the circumferential direction of the integral vulcanized molded product are Each elastic engagement protrusion is brought into contact in a compressed deformation state, and the deformation in the diameter increasing direction of both circumferential ends of the orifice member is applied to the engagement inner peripheral protrusion of the elastic engagement protrusion. A step of obtaining an assembly of the orifice member with respect to the integrally vulcanized molded product by preventing the combined action;
Preparing a metal outer tube member having a cylindrical shape;
After the assembly of the orifice member with respect to the integrally vulcanized molded product is immersed in an incompressible fluid, and the outer cylinder member is extrapolated to the integrally vulcanized molded product in the incompressible fluid, The cylindrical member is reduced in diameter and fitted and fixed to the intermediate sleeve of the integrally vulcanized molded product, thereby covering the first pocket portion and the second pocket portion of the integrally vulcanized molded product in a fluid tight manner. At first, a first fluid chamber and a second fluid chamber, each of which is filled with an incompressible fluid, are formed, and the orifice groove of the orifice member is covered to cover the first fluid chamber and the second fluid. Forming an orifice passage that communicates the chambers with each other. A method for manufacturing a fluid-filled cylindrical vibration isolator.

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