JP4937220B2 - Fluid filled cylindrical vibration isolator - Google Patents

Description

  The present invention relates to a fluid-filled cylindrical vibration-damping device that obtains a vibration-damping effect based on the flow action of a fluid sealed inside.

  Conventionally, an inner shaft member and an outer cylinder member disposed on the outer peripheral side of an inner shaft member and an outer cylinder member disposed as an anti-vibration device that is interposed between members constituting a vibration transmission system and that anti-vibrate and connect the two members are main rubber elastic bodies. A cylindrical vibration isolator having a structure connected to each other is known. In addition, as one type of such a cylindrical vibration isolator, a first fluid chamber and a second fluid chamber, each of which is filled with an incompressible fluid, are provided, and a fluid-filled type in which both the fluid chambers communicate with each other through an orifice passage. There is a cylindrical vibration isolator.

  In this fluid-filled cylindrical vibration isolator, an excellent vibration isolating effect can be easily obtained based on a fluid action such as a resonance action of a fluid that is caused to flow through the orifice passage when vibration is input. Therefore, for example, application to engine mounts, differential mounts, suspension bushings and the like for automobiles is being studied.

  However, in such a fluid-filled cylindrical vibration isolator, the vibration isolating effect exhibited by the resonance action of the fluid can be exerted only on vibrations in a relatively narrow frequency range tuned to the orifice passage. In particular, at the time of vibration input in a frequency range higher than the tuning frequency range of the orifice passage, there is a problem that the orifice passage is substantially closed and the vibration-proof performance is significantly lowered.

  In order to cope with this problem, a structure has been proposed in which a low-frequency orifice passage and a high-frequency orifice passage are provided side by side, and a movable member that restricts the amount of fluid flow is disposed in the high-frequency orifice passage. Since the high-frequency vibration is generally small in amplitude compared to the low-frequency vibration, the low-frequency orifice passage and the high-frequency orifice passage are set according to the input vibration frequency using the fluid flow amount limiting function by the movable member. Selective action.

  However, it is not easy to secure a space for arranging the movable member in the fluid-filled cylindrical vibration isolator. If the cover and the arrangement space for the movable member are enlarged, the formation space for the orifice passage is limited, and it is difficult to ensure both the arrangement space for the movable member and the formation space for the orifice passage. . Moreover, when the movable member is disposed, it is necessary to deal with problems such as an increase in the number of parts of the vibration isolator, a complicated structure, and an increase in assembly work process.

  Therefore, the present applicant previously proposed a fluid-filled cylindrical vibration isolator having a novel structure incorporating a movable member in Japanese Patent Application Laid-Open No. 61-206838 (Patent Document 1). This Patent Document 1 discloses a structure in which a movable rubber film as a movable member is attached to a portion where a communication hole is formed in an orifice passage to a fluid chamber so as to close the communication hole from the inner peripheral side.

  However, as a result of further studies by the present inventor, it has been found that there is room for further improvement in the structure described in Patent Document 1. In particular, a movable rubber film is disposed on the inner circumferential side of the orifice member in order to close the communication hole formed in the orifice member extending in the circumferential direction along the inner circumferential surface of the outer cylinder member, and the movable rubber film It is necessary to fix the support member to the inner peripheral surface of the orifice member. It was not easy in manufacturing to implement the movable rubber film on the inner peripheral surface of the orifice member and to fix the support member with sufficient strength and reliability.

  On the other hand, the present applicant previously proposed a structure in which a movable rubber film is stacked and assembled from the outer peripheral surface side of the orifice member in Japanese Patent Laid-Open No. 2002-155984 (Patent Document 2). According to this, since the support member fixed to the outer peripheral edge portion of the movable rubber film can be clamped and fixed between the orifice member and the outer cylinder member, the manufacture becomes easier as compared with Patent Document 1. . However, in the process of extrapolating the outer cylinder member with the movable rubber film superimposed on the outer peripheral surface of the orifice member, and further drawing the outer cylinder member and clamping the support member, the orifice member It was difficult to hold the movable rubber film at a predetermined position on the outer peripheral surface, and the manufacturing problem was still inherent.

JP-A 61-206838 JP 2002-155984 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the space for arranging the movable member and the space for forming the orifice passage can be ensured in a large amount. Another object of the present invention is to provide a fluid-filled cylindrical vibration isolator having a novel structure in which the movable member can be assembled to the orifice member with a simple structure and easy work.

  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, the outer cylinder member is disposed apart from the outer peripheral side of the inner shaft member, and the inner shaft member and the outer cylinder member are connected by the main rubber elastic body, and one radial direction sandwiching the inner shaft member is provided. Part of the wall portion is formed of a rubber elastic body of the main body to form a first fluid chamber filled with an incompressible fluid, and further incompressible on the other radial side across the inner shaft member A fluid is enclosed to form a second fluid chamber in which a relative pressure fluctuation occurs with the first fluid chamber when a radial vibration is input, while a circumference is formed along the inner circumferential surface of the outer cylinder member. In a fluid-filled cylindrical vibration damping device in which an orifice member extending in a direction is provided and an orifice passage communicating with the first fluid chamber and the second fluid chamber is formed by using the orifice member. A pocket formed on the outer peripheral surface The first fluid chamber is formed by covering with an outer cylinder member, and an orifice member having a structure extending in the circumferential direction so as to straddle the opening of the pocket portion in the circumferential direction is adopted as a low-frequency region as an orifice passage. A tuned low-frequency orifice passage and a high-frequency orifice passage tuned to a high frequency range are formed by using an orifice member, while the opening portion of the high-frequency orifice passage in the orifice member has an outer periphery. The fitting recess that opens to the surface is formed so as to extend from one axial end surface of the orifice member toward the other axial side, and the opposing inner surfaces on both sides in the circumferential direction of the fitting recess are formed from the outer circumferential surface of the orifice member. A reverse taper shape in which the distance between the opposing surfaces gradually increases as it goes inward in the radial direction, and the periphery of the fitting recess formed into the reverse taper shape. The opposing inner surfaces on both sides are made to be relatively inclined surfaces in which the distance between the opposing surfaces gradually decreases from one side of the orifice member toward the other side, and the fitting recesses are fitted into the fitting recesses. A fitting lid is formed which is provided with a communication hole that covers and connects the high-frequency orifice passage to the first fluid chamber through the fitting recess, and both end faces in the circumferential direction of the fitting lid are arranged on both sides in the circumferential direction of the fitting recess. The fitting lid is assembled by inserting the fitting lid into the fitting recess while sliding and displacing the fitting lid in the axial direction as a radially reverse tapered shape corresponding to the opposing inner surface of the fitting. And a movable member is accommodated in the accommodation space by forming an accommodation space between the overlapping surfaces of the fitting lid and the radial direction of the fitting lid, and the first fluid chamber is movable in accordance with pressure fluctuations caused by radial vibration input. High frequency based on member displacement While the fluid flow through the orifice passage for use is generated, one end surface in the axial direction where the fitting recess of the orifice member opens is overlapped with the inner surface of the pocket portion of the main rubber elastic body, and the fitting recess Reverse sliding displacement of one end face in the axial direction of the orifice member of the fitting lid fitted into the stopper is prevented by contact with the inner surface of the pocket portion, so that the fitting lid is prevented from coming out of the fitting recess. It is characterized by the fact that it was made to do so.

  In the fluid-filled cylindrical vibration isolator having the structure according to the present invention, the accommodating space for the movable member is formed by covering the fitting recess with the fitting lid. A space for forming a high-frequency orifice passage can be secured on the outer peripheral surface. Therefore, in the orifice member, it is possible to efficiently ensure both the accommodation space for the movable member and the formation space for the orifice passage.

  In the fluid-filled cylindrical vibration isolator according to the present invention, the specific recess or the inclined shape set on the fitting contact surface between the fitting recess and the fitting lid is used to prevent the fitting recess. The fitting lid can be easily fitted and assembled. On the other hand, the fitting lid fitted in the fitting recess is positioned with high accuracy and prevented from falling off unless slidingly displaced in a specific direction. Therefore, the movable member and the fitting lid can be easily and quickly assembled to the fitting recess of the orifice member. In addition, once assembled, the assembled movable member and the fitting lid are stable and predetermined with respect to the orifice member as long as no displacement of the fitting member relative to the orifice member in the direction opposite to the slide assembling direction occurs. It can be held in the assembled state to the position.

  In addition, the orifice member in which the movable member and the fitting lid are assembled is assembled in the pocket portion, so that the displacement of the fitting lid relative to the orifice member in the direction opposite to the slide assembling direction is prevented by the wall surface of the pocket portion. . Therefore, even when the outer cylinder member is press-fitted or inserted, or when the outer cylinder member is drawn, the assembled state of the movable member and the fitting lid with respect to the orifice member is special. It can be stably maintained without requiring a holding mechanism.

  By the way, in the present invention, for example, in the state where the fitting recess is covered with the fitting lid, a groove is formed in the outer circumferential surface of the fitting lid and the outer circumferential surface of the orifice member so as to extend in the circumferential direction. In addition, a communication hole is formed in the bottom wall of the groove-direction intermediate portion of the groove, and the groove is covered with an outer cylinder member to form a low frequency orifice passage. A mode in which the high-frequency orifice passage is formed by using a part of the low-frequency orifice passage is suitably employed.

  In such an embodiment, the orifice passage is formed using the outer peripheral surface of the fitting lid. Therefore, the space for forming the low-frequency orifice passage and the high-frequency orifice passage on the outer peripheral surface of the orifice member can be more efficiently secured.

  Further, in the present invention, for example, a movable rubber film as a movable member is incorporated in the accommodation space, and the outer peripheral edge of the movable rubber film is an opposing surface between the bottom surface of the fitting recess and the inner surface of the fitting lid. In this assembled state, the central portion of the movable rubber film is between the opposing surfaces of the bottom surface of the fitting recess and the inner surface of the fitting lid. A mode in which a gap is provided and elastic deformation displacement of the central portion of the movable rubber film is allowed may be employed.

  According to such an aspect, the outer peripheral edge portion of the movable rubber film is fixedly supported, and substantial fluid flow through the high-frequency orifice passage is allowed based on the elastic deformation of the central portion of the movable rubber film. . In addition, due to the reaction force based on the elasticity of the movable rubber film, both end surfaces in the circumferential direction of the fitting lid are pressed against opposing inner surfaces on both sides in the circumferential direction of the fitting recess formed in the orifice member. Therefore, the frictional force between the end faces on both sides in the circumferential direction of the fitting recess and the opposing inner surfaces on both sides in the circumferential direction of the fitting recess is increased, and the displacement resistance to the side opposite to the slide assembly direction in the fitting lid is increased. Power is demonstrated. Thereby, before the fitting lid is clamped and fixed between the outer cylinder member and the orifice member, the fitting lid is more effectively prevented from coming off from the orifice member.

  In the present invention, for example, the main rubber elastic body is bonded to the outer peripheral surface of the inner shaft member, and a metal sleeve is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body. A mode in which the formed pocket portion is opened to the outer peripheral surface through a window portion formed in the metal sleeve, and the pocket portion is covered with the outer cylinder member by covering the window portion of the metal sleeve with the outer cylinder member. Can be employed.

  By adopting the metal sleeve, the orifice member can be firmly fixed and assembled between the metal sleeve and the outer cylinder member, and as a result, the fixing force with respect to the fitting lid can be further set. Further, a seal rubber layer can be interposed between the metal sleeve and the outer cylinder member as necessary, and the sealing performance of the incompressible fluid sealing region can be further improved.

  Further, in the present invention, for example, pocket portions that open to the outer peripheral surface of the main rubber elastic body are formed on both sides in the direction perpendicular to the axis across the inner shaft member, and the pocket portions are covered with the outer cylinder member. An orifice member having a structure that forms a first fluid chamber and a second fluid chamber and extends in the circumferential direction so as to straddle the openings of the pocket portions in the circumferential direction is adopted, and the first high-frequency orifice passage in the orifice member is adopted. In both the opening portion to the one fluid chamber and the opening portion to the second fluid chamber, the fitting lids are fitted and assembled to form fitting recesses. The aspect which accommodated and arrange | positioned the movable member in the accommodation space between the overlapping surfaces with a fitting lid may be employ | adopted.

  By placing movable members on both side openings of the high-frequency orifice passage, the function of limiting the amount of fluid flow through the high-frequency orifice passage when low-frequency vibration is input, and hence the reliability and stability of the vibration-proof performance of the low-frequency orifice passage The improvement of property can be achieved. In this aspect, the main rubber elastic body and the orifice member can be used to form a symmetrical structure in the direction perpendicular to the axis where the first and second fluid chambers face each other. By adopting such a symmetrical structure, In addition, the mold shape, the assembling directionality, and the like are made common in the direction perpendicular to the axis, so that the manufacturing cost can be reduced and the manufacturing can be simplified.

  In the present invention, for example, a substantially cylindrical orifice member is formed as a whole by combining a first semi-cylindrical first divided orifice body and a second divided orifice body, and the first divided orifice body. A mode in which a low-frequency orifice passage and a high-frequency orifice passage are formed between the first and second divided orifice bodies may be employed.

  In such an aspect, the orifice member having a substantially cylindrical shape as a whole can secure a larger space for forming the low-frequency orifice passage and the high-frequency orifice passage over the entire circumference of the orifice member.

  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.

  First, FIG. 1 and FIG. 2 show a suspension bush 10 as a first embodiment of a fluid-filled cylindrical vibration isolator according to the present invention. The suspension bush 10 has a structure in which an inner cylinder fitting 12 as an inner shaft member and an outer cylinder fitting 14 as an outer cylinder member are elastically connected by a main rubber elastic body 16. The inner cylinder fitting 12 is attached to a vehicle body (not shown), and the outer cylinder fitting 14 is attached to a suspension arm (not shown), which is a wheel side member, so that it is interposed between the vehicle body and the suspension arm. The vehicle body and the suspension arm are connected to each other in a vibration-proof manner.

  More specifically, the inner cylinder fitting 12 is made of a metal material such as iron or aluminum alloy, and has a small cylindrical shape as a whole. In addition, you may make it form an inner shaft member (inner cylinder metal fitting 12) with a synthetic resin material. Moreover, the inner cylinder metal fitting 12 of this embodiment is the diameter-expanded part 18 by which the axial direction intermediate part was made larger diameter than the axial direction both ends. Furthermore, the inner cylinder fitting 12 of the present embodiment is a flange-shaped portion 20 in which one end portion in the axial direction widens outward in the direction perpendicular to the axial direction.

  Further, an intermediate sleeve 22 as a metal sleeve is disposed on the outer peripheral side of the inner cylinder fitting 12. The intermediate sleeve 22 has a substantially cylindrical shape that is thinner and larger in diameter than the inner cylinder fitting 12, and is formed of the same metal material as the inner cylinder fitting 12. In addition, a pair of window portions 24a and 24b are formed in an intermediate portion in the axial direction of the intermediate sleeve 22 so as to face each other in one radial direction. The window portion 24 is formed so as to extend with a length of a little less than a half circumference, and penetrates the intermediate sleeve 22 in the radial direction. Furthermore, a pair of groove-like portions 26, 26 are formed between the circumferential directions of the pair of window portions 24a, 24b in the intermediate sleeve 22. The groove-shaped portion 26 has a groove shape that opens to the outer peripheral surface at the intermediate portion in the axial direction of the intermediate sleeve 22, extends in the circumferential direction, and communicates with the pair of window portions 24 a and 24 b.

  Further, the inner cylindrical metal member 12 and the intermediate sleeve 22 are arranged on the same central axis so as to be positioned at a predetermined distance in the radial direction over the entire circumference. A main rubber elastic body 16 is interposed therebetween. The main rubber elastic body 16 is formed of a thick rubber elastic body having a substantially cylindrical shape, and is a concave surface that inclines inward in the axial direction as both axial end surfaces go radially inward.

  The inner peripheral surface of the main rubber elastic body 16 is overlapped with the outer peripheral surface of the inner cylindrical metal member 12 and vulcanized and bonded, and the outer peripheral surface is overlapped with the inner peripheral surface of the intermediate sleeve 22 and vulcanized and bonded. Yes. Thereby, the inner cylinder fitting 12 and the intermediate sleeve 22 are elastically connected to each other by the main rubber elastic body 16. That is, in the present embodiment, the main rubber elastic body 16 is formed as an integrally vulcanized molded product 28 provided with the inner cylinder fitting 12 and the intermediate sleeve 22. In the present embodiment, after the vulcanization molding of the main rubber elastic body 16, the intermediate sleeve 22 is subjected to diameter reduction processing such as an eight-way drawing, so By applying compression, the tensile stress acting on the main rubber elastic body 16 is reduced. The inner surface of the groove 26 formed in the intermediate sleeve 22 is entirely covered with a rubber layer integrally formed with the main rubber elastic body 16 (see FIG. 2).

  Further, the main rubber elastic body 16 is formed with a pair of pocket portions 30a and 30b on both sides of the inner cylinder fitting 12 in one radial direction. The pocket portion 30 is formed in a concave shape that opens to the outer peripheral surface at the axially intermediate portion of the main rubber elastic body 16, and as shown in FIG. 2, the pocket portion 30 is formed in the window portion 24 formed in the intermediate sleeve 22. It is formed with a corresponding little less than half circumference. The opening portion of the pocket portion 30 is aligned with the window portion 24, and the pocket portion 30 is communicated with the outer peripheral side of the intermediate sleeve 22 through the window portion 24. Further, in the present embodiment, positioning rubber protrusions 31 that protrude inward in the axial direction and extend in an appropriate length in the circumferential direction are provided on portions of the inner surface of the pocket portion 30 that are opposed to each other in the axial direction. Yes. The positioning rubber protrusions 31 may be formed over the entire length of the pocket portion 30 in the circumferential direction, or a plurality of positioning rubber projections 31 may be formed so as to be aligned in the circumferential direction of the pocket portion 30.

  The outer tube fitting 14 is fitted and fixed to such an integrally vulcanized molded product 28 of the main rubber elastic body 16. The outer cylinder fitting 14 is made of a metal material such as iron or aluminum alloy, and has a thin and large diameter substantially cylindrical shape as a whole.

  Further, the inner peripheral surface of the outer cylindrical metal member 14 is covered with a seal rubber layer 32 over substantially the entire surface. The seal rubber layer 32 is a thin rubber elastic body, and is formed on the inner peripheral surface of the outer cylinder fitting 14. Although not clearly shown in the drawings, the seal rubber layer 32 is formed with seal ridges protruding toward the inner peripheral side so as to protrude from the intermediate sleeve 22 and the orifice member 38 to be described later.

  Such an outer cylinder fitting 14 is fitted and fixed to the integrally vulcanized molded product 28 of the main rubber elastic body 16. That is, after the outer cylinder fitting 14 with the seal rubber layer 32 formed thereon is extrapolated with respect to the intermediate sleeve 22 constituting the integrally vulcanized molded product 28, the outer cylinder fitting 14 is reduced in diameter such as an eight-way throttle. By applying the processing, the outer cylindrical metal member 14 is brought into close contact with the outer peripheral surface of the intermediate sleeve 22 via the seal rubber layer 32 and fixed.

  Further, the outer cylinder fitting 14 is attached to the integral vulcanization molded product 28, so that the openings of the pair of windows 24 a and 24 b formed in the intermediate sleeve 22 are covered with the outer cylinder fitting 14. As a result, the opening portions of the pocket portions 30a and 30b opened through the window portions 24a and 24b are closed by the outer cylindrical fitting 14, and the liquid chamber 36a as the first fluid chamber is utilized using the pocket portion 30a. And a liquid chamber 36b as a second fluid chamber is formed using the pocket portion 30b. The liquid chamber 36 is hermetically sealed from the outside by overlapping the outer tubular fitting 14 with the intermediate sleeve 22 in a fluid-tight manner, and an incompressible fluid is sealed therein. Further, the liquid chambers 36a and 36b are formed on both sides of the inner cylindrical metal fitting 12 so as to face each other in one radial direction which is the main vibration input direction, and as shown in FIG. The chambers 36a and 36b are separated by an axial intermediate portion of the main rubber elastic body 16 extending in the radial direction substantially orthogonal to the opposing direction of the liquid chambers 36a and 36b.

  The incompressible fluid sealed in the liquid chamber 36 is not particularly limited, but water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is preferably used. In particular, in order to effectively obtain an anti-vibration effect based on the fluid flow action described later, it is desirable to employ a low viscosity fluid of 0.1 Pa · s or less as the sealed fluid. The incompressible fluid is sealed in the liquid chamber 36 by, for example, assembling the outer cylinder fitting 14 to the integrally vulcanized molded product 28 of the main rubber elastic body 16 in the incompressible fluid. The

  An orifice member 38 is disposed in the liquid chambers 36a and 36b. The orifice member 38 is a substantially cylindrical member that extends in the circumferential direction along the inner peripheral surface of the outer cylindrical metal member 14, and is disposed so as to straddle the openings of the pocket portions 30a and 30b in the circumferential direction. It is fixed to the integrally vulcanized molded product 28 of the elastic body 16.

  Therefore, the orifice member 38 of the present embodiment is constituted by a pair of orifice halves 40a and 40b having the same shape. That is, in the present embodiment, one orifice half body 40a constitutes a first divided orifice body, and the other orifice half body 40b constitutes a second divided orifice body.

  The orifice half 40 is made of a metal material such as iron or aluminum alloy, a hard synthetic resin material, or the like, and as shown in FIGS. Presents.

  Therefore, in this embodiment, a fitting recess 42 is formed in the central portion in the circumferential direction of the orifice half 40. The fitting recess 42 is formed so as to open to the outer peripheral surface of the orifice half 40 and extend from one axial end surface of the orifice half 40 to the other axial side. Particularly in the present embodiment, the fitting recess 42 is formed from one end surface in the axial direction to the other end surface in the axial direction.

  Further, the opposing inner surfaces 44, 44 on both sides in the circumferential direction of the fitting recess 42 gradually increase in distance between the opposing surfaces from the outer peripheral surface of the orifice half 40 toward the radially inner side. That is, the opposing inner surfaces 44, 44 on both sides in the circumferential direction of the fitting recess 42 have an inversely tapered shape.

  Furthermore, the opposing inner surfaces 44, 44 on both sides in the circumferential direction of the fitting recess 42 have a distance between the opposing surfaces that gradually decreases from one side in the axial direction of the orifice half 40 toward the other side. That is, the opposing inner surfaces 44, 44 on both sides in the circumferential direction of the fitting recess 42 are relatively inclined surfaces in which one of them is inclined relative to the other in the extending direction (longitudinal direction). .

  Furthermore, a through hole 46 is formed in the bottom wall of the fitting recess 42 so as to penetrate the bottom wall in the thickness direction. Incidentally, in this embodiment, the through-hole 46 which has a round-angle square-shaped opening cross section is divided into four by the partition piece.

  Further, an opening peripheral edge portion of the through hole 46 formed in the bottom wall of the fitting recess 42 projects outward in the radial direction of the orifice half 40 and extends over the entire circumference along the edge of the through hole 46. A positioning protrusion 48 is formed. In particular, in the present embodiment, a positioning groove 50 extending in the circumferential direction of the orifice half 40 is formed outside the portion of the positioning projection 48 that is opposed to the orifice half 40 in the axial direction.

  Furthermore, the first peripheral groove 52 and the second peripheral groove that open to the outer peripheral surface and extend in the circumferential direction are formed on the outer peripheral edge of the orifice half 40 except for the position where the fitting recess 42 is formed. 54 are formed at a predetermined distance in the axial direction. That is, the first circumferential groove 52 and the second circumferential groove 54 are each divided in the circumferential direction by the fitting recess 42.

  A fitting lid 56 is assembled to the orifice half 40 having such a structure. The fitting lid 56 is made of a metal material such as steel or an aluminum alloy, and has a bowl shape as a whole as shown in a single view in FIGS. That is, the fitting lid 56 has a curved surface corresponding to the outer peripheral surface of the orifice half 40 on one surface in the thickness direction (hereinafter referred to as an outer surface).

  Further, both end surfaces 58 and 58 in the width direction of the fitting lid 56, that is, in the circumferential direction of the orifice half 40 in the fitting lid 56 are both sides in the circumferential direction in the fitting recess 42 formed in the orifice half 40. Corresponds to the opposite inner surfaces 44, 44. That is, both end surfaces 58, 58 in the width direction of the fitting lid 56 are formed in a reverse taper shape in the thickness direction (the radial direction of the orifice half 40), and their extending direction (the orifice half 40). In the axial direction, one is an axially relative inclined surface that is inclined relative to the other.

  Further, the fitting lid 56 has a first connection groove 60 and a second connection groove 62 that open to the outer surface and extend in the width direction (the circumferential direction of the orifice half 40). Are formed so as to be lined up in the longitudinal direction of the fitting lid 56 corresponding to.

  An accommodation recess 64 is formed in the other surface (hereinafter referred to as an inner surface) in the thickness direction of the fitting lid 56. The accommodation recess 64 is a recess having a square section with rounded corners. Furthermore, a deformation allowing recess 66 is formed in the central portion of the receiving recess 64. The deformation-permissible recess 66 is a tapered recess having a circular cross section that gradually decreases in diameter toward the bottom side (the outer peripheral side of the orifice half 40), and opens to the bottom wall surface of the receiving recess 64. Is formed.

  Further, a communication hole 68 is formed in the fitting lid 56 at the bottom wall portion of the second connection groove 62. The communication hole 68 is an oval hole that penetrates the bottom wall portion of the second connection groove 62 in the radial direction of the orifice half 40, and one end is the center in the groove direction of the second connection groove 62. The other end is opened to the bottom wall portion of the housing recess 64 while being opened to the portion.

  A movable rubber film 70 as a movable member is attached to the fitting lid 56 having such a structure. As shown in FIGS. 10 and 11, the movable rubber film 70 is formed of a substantially rounded rectangular rubber elastic body corresponding to the shape of the housing recess 64. A support portion 72 that protrudes toward both sides in the thickness direction is integrally formed on the outer peripheral edge portion of the movable rubber film 70. Further, a seal lip 74 is integrally formed over the entire circumference in the center portion in the width direction of the support portion 72 and protrudes to both sides in the thickness direction. Furthermore, the movable rubber film 70 of this embodiment is gradually thinner at the center portion toward the center. Thereby, both surfaces of the central portion of the movable rubber film 70 are tapered inclined surfaces.

  Then, with the movable rubber film 70 fitted in the receiving recess 64 of the fitting lid 56, the fitting lid 56 is assembled to the orifice half 40 as shown in FIGS. ing. Specifically, the fitting lid 56 is slidably displaced from one side in the axial direction of the orifice half 40 to the other side, thereby being fitted into the fitting recess 42 and assembled. . As a result, the support portion 72 formed on the outer peripheral edge of the movable rubber film 70 is sandwiched between the bottom wall surface of the housing recess 64 and the bottom surface of the fitting recess 42, so that the movable rubber film 70 is elastic at the center. The orifice half 40 is mounted in a state where deformation is allowed.

  Note that the support portion 72 is positioned outside the positioning projection 48 with the movable rubber film 70 mounted in this manner. In particular, all the portions of the support portion 72 that are opposed to each other in the sliding direction of the fitting lid 56 are positioned in the positioning groove 50. Thus, the movable rubber film 70 is effectively positioned in a state where the fitting lid 56 is attached to the orifice half 40.

  When the movable rubber film 70 is attached as described above, the movable rubber film 70 is fitted to the bottom wall surface of the housing recess 64 formed in the fitting lid 56 and the fitting recess formed in the orifice half 40. 42 is accommodated and disposed in an accommodating space 76 formed between the opposed surfaces of the bottom surface of 42, that is, between the overlapping surfaces in the radial direction of the orifice half 40. In particular, in this embodiment, the deformation-permissible recess 66 is formed on the outer peripheral side (outer side) of the housing recess 64, and the movable rubber film 70 is positioned on the outer peripheral side (outer side) of the positioning protrusion 48. Therefore, a gap is formed between the movable rubber film 70 and the bottom surface of the housing recess 64 or the bottom surface of the fitting recess 42 so that elastic deformation of the central portion of the movable rubber film 70 is effectively allowed. It has become. As is clear from this, in this embodiment, the inner surface of the fitting lid 56 is constituted by the bottom wall surface of the housing recess 64.

  In addition, with the movable rubber film 70 mounted as described above, the movable rubber film 70 covers the opening on the liquid chamber 36 side of the communication hole 68 formed in the fitting lid 56 and also on the orifice half 40. The formed through-hole 46 is disposed so as to cover the radially outward opening. Therefore, in the present embodiment, the seal lip 74 integrally formed with the support portion 72 is sandwiched between the bottom surface of the housing recess 64 and the bottom surface of the fitting recess 42, thereby allowing the movable rubber film 70. Are arranged so as to fluid-tightly cover the opening of the deformation allowable recess 66 including the opening on the inner peripheral side of the communication hole 68 and to cover the opening on the outer peripheral side of the through hole 46 in a fluid-tight manner. .

  Furthermore, in the state where the fitting lid 56 is assembled to the orifice half 40 as described above, the first circumferential groove 52 and the first connection groove 60 cooperate with each other at the outer peripheral edge of the orifice half 40. Thus, the first concave groove 78 that opens to the outer peripheral surface and extends in the circumferential direction, the second peripheral groove 54 and the second connection groove 62 cooperate to open the outer peripheral surface and extend in the circumferential direction. Two concave grooves 80 are formed at a predetermined distance in the axial direction. Here, the first concave groove 78 extends with a length slightly shorter than the entire circumferential length of the orifice half 40, and one end thereof is formed in the vicinity of the circumferential end of the orifice half 40. The other end of the orifice half 40 is open to the circumferential end surface of the orifice half 40. The second groove 80 extends over the entire length in the circumferential direction of the orifice half 40, and both end portions thereof are opened at the circumferential end of the orifice half 40. A slope 84 is formed at one end of the second concave groove 80, and the first concave groove 78 gradually increases as one end of the second concave groove 80 goes outward in the circumferential direction. Inclined toward the side.

  And the orifice half body 40 to which the fitting lid 56 is assembled as described above is mounted on the integrally vulcanized molded product 28 of the main rubber elastic body 16 as shown in FIGS. . That is, as shown in FIG. 2, the pair of orifice halves 40a and 40b are fitted to the integrally vulcanized molded product 28 from both sides in the radial direction where the pair of pocket portions 30a and 30b face each other. In addition, both end portions in the circumferential direction of the orifice halves 40a and 40b are fitted into the pair of groove portions 26 and 26, and intermediate portions in the circumferential direction of the orifice halves 40a and 40b are formed in the main rubber elastic body 16. The pocket 30 is positioned so as to extend across the opening in the circumferential direction. Thereby, the orifice member 38 which has a substantially cylindrical shape as a whole is formed by combining the orifice halves 40a and 40b to which the fitting lid 56 is assembled.

  Further, in the state where the orifice member 38 is mounted on the integrally vulcanized molded product 28 of the main rubber elastic body 16 in this way, one end surface in the axial direction of the orifice half 40 is brought into contact with the inner surface of the pocket portion 30. It has been. As a result, one end surface in the axial direction (one longitudinal direction) of the fitting lid 56 fitted and assembled in the fitting recess 42 formed in the orifice half 40 is also brought into contact with the inner surface of the pocket portion 30. It has been. In particular, in this embodiment, both end surfaces in the axial direction of the fitting lid 56 are brought into contact with the inner surface of the pocket portion 30 via the positioning rubber protrusions 31. In other words, the positioning rubber protrusion 31 is clamped between the axial end surface of the fitting lid 56 and the inner surface of the pocket portion 30 in a state in which the orifice half 40 is fitted in the pocket portion 30. Thereby, the positional deviation in the axial direction of the orifice half 40 is prevented.

  Further, the pair of orifice halves 40a and 40b are mounted so as to be reversed in the vertical direction (axial direction), and each of the orifice halves 40a and 40b is attached to the integrally vulcanized molded product 28. The slopes 84 of the bodies 40a and 40b are connected to each other at one end in the circumferential direction. Thereby, in the orifice member 38 constituted by a pair of orifice halves 40a and 40b, the concave grooves 78 and 80 of the orifice half 40a and the concave grooves 78 and 80 of the orifice half 40b are connected in series, A spiral groove 86 is formed as a groove extending in a circumferentially continuous outer peripheral edge portion of the orifice member 38 with a length of a little less than two rounds.

  Further, the outer cylindrical member 14 is fitted and fixed to the integrally vulcanized molded product 28 with the orifice member 38 attached, whereby the outer peripheral surface of the orifice member 38 becomes the inner peripheral surface of the outer cylindrical member 14. On the other hand, it is fluid-tightly overlapped via the seal rubber layer 32. As a result, the opening on the outer peripheral side of the spiral groove 86 formed in the orifice member 38 is fluid-tightly covered with the outer cylinder fitting 14, and the spiral groove 86 is used as a low-frequency orifice passage. A first orifice passage 88 is formed.

  The first orifice passage 88 is a tunnel-like flow path that spirally extends in the circumferential direction with a length of a little less than two rounds, and one end communicates with the liquid chamber 36a through the connection hole 82 of the orifice half 40a. In addition, the other end is communicated with the liquid chamber 36 b through the connection hole 82 of the orifice half 40 b, and the pair of liquid chambers 36 a and 36 b are communicated with each other through the first orifice passage 88. The first orifice passage 88 adjusts the ratio of the passage length and the passage cross-sectional area in consideration of the wall spring rigidity of the liquid chamber 36, so that the flow of fluid with respect to the vibration-proof vibration in the low frequency range is reduced. It is tuned so that the vibration-proof effect based on the action is exhibited.

  Here, communication holes 68 and 68 penetrating through the inner peripheral wall portion are formed in the intermediate portion in the longitudinal direction of the first orifice passage 88, and the intermediate portion in the longitudinal direction of the first orifice passage 88 is formed. The portion communicates with the liquid chambers 36 a and 36 b through the communication holes 68 and 68. Then, the first orifice is formed by utilizing the communication holes 68 and 68 formed in each of the orifice halves 40a and 40b and a part of the first orifice passage 88 positioned between the communication holes 68 and 68. A second orifice passage 90 is formed as a high-frequency orifice passage that connects the pair of liquid chambers 36 a and 36 b with a passage length shorter than the passage 88. The second orifice passage 90 is formed with a passage sectional area substantially equal to the first orifice passage 88 and a passage length of about a half circumference shorter than the first orifice passage 88. Is tuned so as to exhibit an anti-vibration effect based on the resonance action of the fluid against vibrations in a high frequency range.

  Further, in the present embodiment, the movable rubber film 70 is disposed on the opening portion of the second orifice passage 90 to the pair of liquid chambers 36 a and 36 b, in other words, on both ends of the second orifice passage 90. The communication hole 68 of each orifice half 40 is covered with the movable rubber film 70. Accordingly, the substantial fluid flow through the second orifice passage 90 is restricted when the low frequency vibration is input, and the movable rubber film 70 is moved to the liquid chamber 36a when the medium to high frequency vibration is input. , 36b is elastically deformed by relative pressure fluctuations, so that the liquid chambers 36a, 36b are substantially communicated with each other through the second orifice passage 90.

  In the suspension bush 10 having such a structure, a first orifice passage 88 and a second orifice passage 90 are formed at positions radially outward from the accommodation space 76 in which the movable rubber film 70 is accommodated. Therefore, both the space for disposing the movable rubber film 70 and the space for forming the first and second orifice passages 88 and 90 can be efficiently secured.

  Further, the fitting lid 56 in which the movable rubber film 70 is fitted in the receiving recess 64 is slid from one side in the axial direction to the other side with respect to the fitting recess 42 of the orifice half body 40, so that the orifice Since the movable rubber film 70 is accommodated in the accommodating space 76 by being fitted into the fitting recess 42 of the half body 40 and assembled, the assembling work of the movable rubber film 70 is simplified. I can do it.

  Further, since both end surfaces 58, 58 in the circumferential direction of the fitting lid 56 have a radially reverse tapered shape corresponding to the opposite inner surfaces 44, 44 on both sides in the circumferential direction of the fitting recess 42, the fitting recess 42 is provided. It is possible to avoid the fitting lid 56 fitted into the fitting recess 42 from slipping out from the fitting recess 42 to the radially outer side or the other axial side.

  Furthermore, in a state where the orifice half 40 is assembled to the integrally vulcanized molded product 28 of the main rubber elastic body 16, the pocket portion 30 in which one end surface in the axial direction of the orifice half 40 is formed in the main rubber elastic body 16. Therefore, the fitting lid 56 assembled to the orifice half 40 can be prevented from slipping out from the fitting recess 42 to one side in the axial direction.

  Therefore, in the suspension bush 10 having the above-described structure, although the assembly of the fitting lid 56 to the fitting recess 42 can be realized by a very simple method of sliding displacement, the orifice half 40 is formed. When the main rubber elastic body 16 is assembled to the integrally vulcanized molded product 28, the fitting lid 56 is further fitted with the fitting half 56 in a state where the orifice half 40 is assembled to the single rubber vulcanized product 28 of the main rubber elastic body 16. The escape from the place 42 can be effectively prevented.

  In the present embodiment, the first orifice passage 88 and the second orifice passage 90 are formed using the first and second connection grooves 60 and 62 formed on the outer surface of the fitting lid 56. Therefore, the space for accommodating the movable rubber film 70 is effectively formed in a region inside the outer peripheral surface of the orifice member 38 while ensuring a sufficient space for forming the first orifice passage 88 and the second orifice passage 90. Can be secured.

  Furthermore, in this embodiment, the support portion 72 of the movable rubber film 70 is attached to the bottom surface of the fitting lid 56 and the fitting recess 42 in a state where the fitting lid 56 is fitted into the fitting recess 42 and assembled. Therefore, the restoring force resulting from the compressive deformation of the support portion 72 is exerted outwardly in the radial direction of the orifice half 40 with respect to the fitting lid 56. Both end surfaces 58, 58 in the circumferential direction are pressed against opposing inner surfaces 44, 44 on both sides in the circumferential direction in the fitting recess 42 in the radial direction of the orifice half 40. As a result, the frictional force generated between the fitting lid 56 and the orifice half 40, that is, the resistance force acting in the direction of preventing the fitting lid 56 from coming out of the fitting recess 42 can be increased. I can do it. As a result, it is possible to prevent a problem that the fitting lid 56 is detached from the orifice half 40 when the orifice half 40 is assembled to the integrally vulcanized molded product 28 of the main rubber elastic body 16.

  Next, an automotive engine mount 100 as a second embodiment of the fluid-filled cylindrical vibration isolator according to the present invention will be described with reference to FIG. The engine mount 100 includes a first mounting bracket 102 as an inner shaft member and a second mounting bracket 104 as an outer cylinder member spaced apart from each other, and the first mounting bracket 102 and the second mounting bracket 104. Are elastically connected by the main rubber elastic body 106, and the first mounting bracket 102 is attached to the power unit of the automobile, while the second mounting bracket 104 is attached to the body of the automobile, thereby the power unit. Is designed to support the body against vibration. The engine mount 100 of this embodiment is mounted in a state where the vertical direction in FIG. 15 is a substantially vertical vertical direction. In the following description, the vertical direction is basically the vertical direction in FIG. It shall be the direction.

  More specifically, the first mounting bracket 102 includes a support shaft portion 108 having a solid, small-diameter circular rod shape, with respect to the axial upper end portion of the support shaft portion 108 that extends straight in the vertical direction. The mounting and fixing portion 110 that extends in a thick and flat shape on the central axis is integrally formed. A taper portion 112 is provided at an axially intermediate portion of the support shaft portion 108, and the lower portion in the axial direction of the support shaft portion 108 has a smaller diameter than the upper portion in the axial direction across the taper portion 112. .

  Further, a metal sleeve 114 as an intermediate sleeve having a thin large-diameter cylindrical shape is disposed on substantially the same central axis line at a predetermined distance in the radial direction on the outer peripheral side of the first mounting bracket 102. . The metal sleeve 114 has a step 116 at an intermediate portion in the axial direction, and a stepped cylindrical shape in which the lower portion in the axial direction is a fitting portion 118 having a smaller diameter than the upper portion in the axial direction across the step 116. It is said that. In addition, a pair of window portions 120 and 120 are formed in the axially intermediate portion of the metal sleeve 114 at a portion opposed in one radial direction, and are opened with a length of a little less than a half circumference in the circumferential direction. . The pair of window portions 120 and 120 are formed on both sides in the axial direction including the step 116 so as to extend in the circumferential direction across the circumferential edge portions of the adjacent window portions 120. A step 116 is formed.

  The first mounting bracket 102 is disposed in a state where the first mounting bracket 102 is inserted from the axial upper opening of the metal sleeve 114, and the entire support shaft portion 108 of the first mounting bracket 102 is separated in the radial direction. In this state, the metal sleeve 114 is positioned. The mounting fixing portion 110 of the first mounting bracket 102 is positioned so as to protrude upward in the axial direction from the metal sleeve 114, while the lower end portion in the axial direction of the support shaft portion 108 is the lower end in the axial direction of the metal sleeve 114. It is positioned in the middle part in the axial direction that does not reach the part.

  Further, the main rubber elastic body 106 is disposed between the support shaft portion 108 of the first mounting bracket 102 and the radially facing surface of the metal sleeve 114, and the first mounting bracket 102 and the metal sleeve 114 are connected to each other. The main rubber elastic body 106 is elastically connected. The main rubber elastic body 106 has a thick cylindrical shape as a whole, and its inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the support shaft portion 108 of the first mounting bracket 102, The outer peripheral surface is vulcanized and bonded to the inner peripheral surface of the metal sleeve 114. In short, the main rubber elastic body 106 is formed as an integrally vulcanized molded product including the first mounting bracket 102 and the metal sleeve 114. The main rubber elastic body 106 is extended to the outer peripheral surface of the metal sleeve 114 through the window portion 120 of the metal sleeve 114, and the fitting portion 118 in a region outside the portion where the window portion 120 is formed on the periphery. An engagement rubber 122 is formed at the upper end of the.

  A large-diameter circular recess 124 that opens downward is formed at the lower end in the axial direction of the main rubber elastic body 106. The circular recess 124 is a reverse mortar-shaped or hemispherical recess, and is formed in the central portion in the radial direction at the lower end of the main rubber elastic body 106. Further, the main rubber elastic body 106 is formed with a pair of pocket portions 126, 126 opened on the outer peripheral surface on both sides of the first mounting member 102 in one radial direction. Each of the pair of pocket portions 126, 126 has an expanded shape (see FIG. 15) in which the axial opening width gradually increases as it approaches the opening, and is formed with a length of slightly less than a half circumference in the circumferential direction. The metal sleeve 114 is opened on the outer peripheral surface through a pair of windows 120 and 120.

  On the other hand, the second mounting bracket 104 has a cylindrical shape having a diameter larger than that of the metal sleeve 114, and a stepped portion 128 that extends in the radial direction is formed at an intermediate portion in the axial direction. A stepped cylindrical shape is formed such that the upper side in the axial direction is a large-diameter cylindrical portion 130 and the lower side in the axial direction is a small-diameter cylindrical portion 132. The large-diameter cylindrical portion 130 has substantially the same axial length as the metal sleeve 114.

  Further, a diaphragm 134 as a flexible film is vulcanized and bonded to the small diameter cylindrical portion 132. Diaphragm 134 is formed of a thin rubber elastic film and has a disk shape with a slack in the central portion so that deformation is easily permitted. Then, the outer peripheral edge portion of the diaphragm 134 is vulcanized and bonded to the small diameter cylindrical portion 132 over the entire circumference, so that the opening portion on the lower side in the axial direction of the second mounting bracket 104 is fluidized by the diaphragm 134. Closely covered. Note that a thin seal rubber layer 136 integrally formed with the diaphragm 134 is vulcanized and bonded to the second mounting bracket 104, and the inner peripheral surfaces of the large diameter cylindrical portion 130 and the small diameter cylindrical portion 132 are entirely covered. And is covered with a seal rubber layer 136.

  Then, the second mounting bracket 104 is reduced in diameter by, for example, eight-way drawing, by extrapolating the large-diameter cylindrical portion 130 of the second mounting bracket 104 to the integrally vulcanized molded product of the main rubber elastic body 106. As a result, the large-diameter cylindrical portion 130 is externally fixed to the metal sleeve 114. Accordingly, the support shaft portion 108 of the first mounting bracket 102 and the large-diameter cylindrical portion 130 of the second mounting bracket 104 are elastically connected by the main rubber elastic body 106. Note that the lower end surface of the metal sleeve 114 in the axial direction is in contact with the stepped portion 128 of the second mounting bracket 104, whereby the metal sleeve 114 is positioned in the axial direction with respect to the second mounting bracket 104. Yes. In addition, the gap between the fitting surfaces of the metal sleeve 114 and the second mounting bracket 104 is sealed by sandwiching a seal rubber layer 136.

  As described above, the second mounting bracket 104 is externally fitted and fixed to the metal sleeve 114, so that the opening on the large-diameter cylindrical portion 130 side of the second mounting bracket 104 is covered fluid-tightly by the main rubber elastic body 106. ing. As a result, a fluid sealing chamber 138 in which an incompressible fluid is sealed is formed at the bottom portion of the second mounting member 104. As the sealed fluid, for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof can be used. In particular, the prevention fluid based on the resonance action of the fluid through the first orifice passage 152 described later. In order to effectively obtain the vibration effect, it is desirable to employ a low viscosity fluid having a viscosity of 0.1 Pa · s or less.

  In addition, a partition member 140 having a substantially disc shape as a whole is disposed in the fluid sealing chamber 138 so as to extend in the direction perpendicular to the axis. The partition member 140 is formed by superimposing a thin disk-shaped lid fitting 144 on the upper surface of the thick disk-shaped partition fitting 142. The outer peripheral edge of the metal fitting 144 is overlapped in a close state, and is sandwiched between the stepped portion 128 of the second mounting metal fitting 104 and the outer peripheral edge of the lower end surface in the axial direction of the main rubber elastic body 106. The second mounting bracket 104 is fixedly assembled. In the present embodiment, protrusions protruding upward are formed at a plurality of positions on the outer periphery of the partition fitting 142, and through holes are formed at positions corresponding to the protrusions in the lid fitting 144. The partition fitting 142 and the lid fitting 144 are positioned relative to each other in the circumferential direction and in the direction perpendicular to the axis by inserting the protrusion into the through hole.

  Such a partition member 140 is disposed so as to expand in the direction perpendicular to the axis in the fluid sealing chamber 138 and is supported by the second mounting bracket 104, so that the fluid sealing chamber 138 is divided into two parts up and down by the partition member 140. A pressure receiving chamber 146 as a main liquid chamber having a part of the wall portion made of the main rubber elastic body 106 is formed on the upper side across the partition member 140, and on the lower side of the partition member 140. Is formed with an equilibration chamber 148 as a sub-liquid chamber in which a part of the wall portion is constituted by a diaphragm 134. When the vibration is input, the pressure fluctuation based on the elastic deformation of the main rubber elastic body 106 is applied to the pressure receiving chamber 146, and the volume change of the equilibrium chamber 148 is easily allowed based on the deformation of the diaphragm 134. Thus, a relative pressure difference is generated between the pressure receiving chamber 146 and the equilibrium chamber 148.

  Furthermore, the partition metal fitting 142 is formed with a circumferential groove 150 having an opening on the outer peripheral surface and extending in the circumferential direction at the outer peripheral portion with a length of a little less than one round. The opening of the circumferential groove 150 is the second attachment. The small diameter cylindrical portion 132 of the metal fitting 104 is covered fluid-tightly. Thereby, the outer peripheral part of the partition member 140 extends in the circumferential direction, one end in the circumferential direction is connected to the pressure receiving chamber 146 through the upper communication hole (not shown), and the other end in the circumferential direction is the lower communication hole. A first orifice passage 152 connected to the equilibrium chamber 148 is formed through (not shown), and fluid flow between the pressure receiving chamber 146 and the equilibrium chamber 148 is allowed through the first orifice passage 152. It has become so. In the present embodiment, the first orifice passage 152 has a high damping effect in a low frequency region corresponding to an engine shake based on the resonance action of the fluid flowing through the first orifice passage 152. Length, cross-sectional area, etc. are adjusted.

  Furthermore, a circular central recess 154 that opens upward is formed in the central portion of the partition fitting 142, and the opening of the central recess 154 is covered with the lid fitting 144 so as to be separated from the outside. A storage area 156 is formed. Further, in the partition fitting 142 and the lid fitting 144, a plurality of through holes 158 are formed in portions constituting the wall portions on both sides in the axial direction of the containing area 156, and the receiving area 156 receives pressure through the through holes 158. The chamber 146 communicates with the equilibrium chamber 148.

  Furthermore, the movable film 160 is accommodated in the accommodation area 156. The movable film 160 is formed of a rubber elastic body having a disk shape with a predetermined thickness, and a central support portion 162 that protrudes toward both sides in the thickness direction is integrally formed with a small-diameter columnar shape at a central portion in the radial direction. In addition, an annular support portion 164 that protrudes toward both sides in the thickness direction is formed integrally with the outer peripheral edge portion. In addition, a buffer protrusion that protrudes on both sides in the axial direction is integrally formed at a radial intermediate portion of the movable film 160 of the present embodiment. It is configured to abut against the metal fitting 144 in a buffering manner.

  The central support portion 162 and the annular support portion 164 are sandwiched between the opposing surfaces of the partition fitting 142 and the lid fitting 144, so that the accommodation region 156 is elastically supported by the partition fitting 142 and the lid fitting 144. The radial intermediate portion of the movable film 160, which is a portion located between the central support portion 162 and the annular support portion 164 in the radial direction, is located with respect to any of the partition fitting 142 and the lid fitting 144. Also, they are positioned at a predetermined distance in the axial direction, and a predetermined amount of elastic deformation is allowed in the axial direction (thickness direction) at the radial intermediate portion of the movable film 160.

  Note that the pressure of the pressure receiving chamber 146 and the pressure of the equilibrium chamber 148 are applied to both surfaces of the movable film 160 through the through holes 158 formed in the wall portion of the accommodation region 156. Since the movable film 160 is elastically deformed based on the pressure difference between the pressure receiving chamber 146 and the equilibrium chamber 148 exerted on the fluid, the fluid flow between the pressure receiving chamber 146 and the equilibrium chamber 148 becomes the elastic deformation amount of the movable film 160. In response to this, the pressure fluctuation in the pressure receiving chamber 146 is substantially reduced or absorbed. In particular, in this embodiment, the amount of elastic deformation of the movable film 160 is limited by the elasticity of the movable film 160 and the contact with the inner surface of the central recess 154 at the radial intermediate portion of the movable film 160, thereby When the medium or high frequency small amplitude vibration is input, the pressure fluctuation of the pressure receiving chamber 146 can be advantageously absorbed or reduced based on the elastic deformation of the movable film 160, while the low frequency large amplitude vibration such as engine shake is input. By restricting the amount of elastic deformation of the movable film 160, effective pressure fluctuation is induced in the pressure receiving chamber 146.

  On the other hand, the second mounting bracket 104 is externally fixed to the metal sleeve 114, so that the window portions 120, 120 of the metal sleeve 114 are fluid-tightly covered with the second mounting bracket 104. As a result, the openings of the pair of pocket portions 126 and 126 are covered, and a pair of working fluid chambers 166 and 166 in which an incompressible fluid is sealed are formed. That is, in the present embodiment, the first fluid chamber is constituted by one working fluid chamber 166, and the second fluid chamber is constituted by the other working fluid chamber 166. The pair of working fluid chambers 166 and 166 are filled with an incompressible fluid similar to that of the fluid sealing chamber 138.

  Although not necessarily clear in the figure, the pair of working fluid chambers 166 and 166 are opposed to each other with the support shaft portion 108 of the first mounting bracket 102 in one radial direction, and the main body rubber elasticity They are separated from each other by the body 106. As a result, when the main rubber elastic body 106 is elastically deformed by the input of vibration, pressure fluctuations that are opposite to each other in the positive and negative directions are positively generated in the pair of working fluid chambers 166 and 166. . As is clear from this, each of the pair of working fluid chambers 166 and 166 is a so-called pressure receiving chamber in which a part of the wall portion is constituted by the main rubber elastic body 106 and pressure fluctuation is caused by vibration input. Has been.

  Further, the working fluid chamber 166 is provided with the orifice member 168 shown in FIGS. 16 and 17 in the accommodated state. The orifice member 168 is formed of a hard material such as a synthetic resin material or a metal material, and has an open cylindrical shape that is substantially C-shaped when viewed from the axial direction. In addition, the upper end edge of the orifice member 168 is formed with notches 170 extending in the radial direction at a plurality of locations on the circumference, and is opened upward. In FIG. 16 and FIG. 17, for easy understanding, lines other than the structural lines of the members (for example, lines indicating curvature) are indicated by thin lines.

  Further, a concave groove 172 is opened on the outer peripheral surface of the orifice member 168. The concave groove 172 has a groove shape extending in the circumferential direction, and is folded back and extends with a predetermined length of about one and a half rounds. In addition, a first connection hole 174 that penetrates the orifice member 168 in the radial direction is formed at one end of the groove 172, and an orifice member 168 is formed at the other end of the groove 172. A second connection hole 176 penetrating in the radial direction is formed, and both end portions in the length direction of the concave groove 172 formed in the outer peripheral edge portion of the orifice member 168 are the first and second connection holes 174 and 176. The orifice member 168 communicates with a region on the inner peripheral side.

  Furthermore, a movable rubber film 70 as a movable member is assembled to the orifice member 168. That is, also in the present embodiment, the fitting lid 56 and the fitting recess 42 which are fitted and assembled in the fitting recess 42 formed so as to open on the outer peripheral surface of the orifice member 168 are overlapped in the radial direction. The movable rubber film 70 is accommodated in the accommodation space 76 formed between the surfaces. In addition, in the following description, about the member and site | part made into the same structure as 1st embodiment, those detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol as 1st embodiment.

  The orifice member 168 having such a structure is extrapolated from below in the axial direction with respect to the fitting portion 118 of the metal sleeve 114 vulcanized and bonded to the outer peripheral surface of the main rubber elastic body 106, and the second attachment. The metal sleeve 114 and the second mounting bracket 104 are opposed to each other by being positioned on the inner peripheral side of the large-diameter cylindrical portion 130 of the bracket 104 and subjecting the second mounting bracket 104 to diameter reduction processing. It is inserted and fixed between them. Under the arrangement of the orifice member 168, the orifice member 168 is disposed along the inner peripheral surface of the second mounting member 104 so as to straddle the opening of the one pocket portion 126 in the circumferential direction. In addition, both end portions in the circumferential direction are positioned on the opening portion of the other pocket portion 126. When the orifice member 168 is assembled to the integrally vulcanized molded product of the main rubber elastic body 106, the engagement rubber 122 fixed to the upper end portion of the outer peripheral surface of the fitting portion 118 of the metal sleeve 114 is the orifice member. The orifice member 168 is positioned in the circumferential direction with respect to the integrally vulcanized molded product of the main rubber elastic body 106 by being fitted into a notch 170 formed at the upper end of 168.

  Further, under the assembled state of the orifice member 168, the outer peripheral surface of the orifice member 168 is brought into close contact with the inner peripheral surface of the second mounting bracket 104 via the seal rubber layer 136, and the outer peripheral surface of the orifice member 168 The opening of the concave groove 172 that is opened in the first and second fittings 104 is fluid-tightly covered. Further, one end of the concave groove 172 communicates with one working fluid chamber 166 through the first connection hole 174, and the other end of the concave groove 172 passes through the second connection hole 176. The other working fluid chamber 166 is communicated. As a result, the orifice member 168 and the second mounting bracket 104 extend in the circumferential direction by a predetermined length and serve as a second low-frequency orifice passage that allows the pair of working fluid chambers 166 and 166 to communicate with each other. The orifice passage 178 is formed using the concave groove 172. In the present embodiment, the second orifice passage 178 is tuned so as to exhibit a high damping effect upon vibration input in a low frequency range.

  Further, the communication hole 68 formed in the bottom wall of the concave groove 172 is positioned radially outward of the one working fluid chamber 166. As a result, the pressure of one working fluid chamber 166 is applied to one surface of the movable rubber film 70 through the through hole 46 formed in the bottom wall of the fitting recess 42, and the movable rubber film The pressure of the other working fluid chamber 166 is applied to the other surface of the membrane 70 through the communication hole 68. That is, a third orifice passage 180 as a high-frequency orifice passage is formed using a part of the second orifice passage 178. In this embodiment, by appropriately adjusting the ratio between the passage length and the passage length of the third orifice passage 180, the resonance of the fluid that flows through the third orifice passage 180 at the time of vibration input in the high frequency range. The anti-vibration effect (low dynamic spring effect) based on the action is exhibited.

  Also in the automobile engine mount 100 having the above-described structure, the fitting lid 56 is slidably displaced from one side in the axial direction to the other side with respect to the fitting recess 42, so that the fitting lid 56 is The fitting recess 42 is fitted and assembled, and has a diameter larger than that of the movable rubber film 70 disposed between the overlapping surfaces of the fitting lid 56 and the fitting recess 42 in the radial direction. Since the second orifice passage 178 and the third orifice passage 180 are formed at positions outside the direction, the same effect as that of the first embodiment can be obtained.

  As mentioned above, although several embodiment of this invention has been explained in full detail, these are illustrations to the last, Comprising: This invention is not limited at all by the specific description in this embodiment. .

  For example, in the first embodiment, the suspension bush 10 having the structure in which the movable rubber film 70 is disposed at each of both end portions of the second orifice passage 90 has been described. As shown in FIG. In addition, it is of course possible to apply the present invention to the suspension bush 190 in which the movable rubber film 70 is disposed only at one end of the second orifice passage 90.

  In this case, an orifice half 192 is employed instead of the orifice half 40b. The orifice half 192 is formed of the same material as that of the orifice half 40, and as shown in FIG. 19, a first concave groove 78 and a second groove that open to the outer peripheral surface and extend in the circumferential direction are formed. The structure is such that a concave groove 80 is formed.

  Then, the outer cylinder fitting 14 is fitted and fixed to the integrally vulcanized molded product 28 of the main rubber elastic body 16 in which the orifice half 40a and the orifice half 192 are assembled, so that the same as in the first embodiment. A first orifice passage 88 having a passage length is formed. The second orifice passage 90 is connected to the liquid chamber 36b from the connection hole 82 of the orifice half 192, and thereby the passage length is longer than that of the first embodiment.

  In the first embodiment, the suspension bush 10 having a structure in which each of the pair of liquid chambers 36a and 36b is a pressure receiving chamber has been described. However, as shown in FIG. It is of course possible to apply the present invention to the cylindrical mount 196 in which the so-called equilibrium chamber 36b is formed of a rubber film 194 that is easily deformable and is easily allowed to change in volume. .

  In this case, the orifice member 198 having a semi-cylindrical shape is assembled to the integrally vulcanized molded product 28 of the main rubber elastic body 16. As shown in FIG. 21, the orifice member 198 includes a first concave groove 78 and a second concave groove 80 that open to the outer peripheral surface and extend in the circumferential direction. The other end of the second concave groove 80 is formed in the circumferential direction of the orifice member 198, etc., compared to the orifice half (40) of the first embodiment. The second concave groove 80 is not closed at the end face, and the second concave groove 80 becomes a dead end in the vicinity of the communication hole 68 formed in the fitting lid 56 assembled to the orifice member 198. In other words, the orifice member 198 has a structure in which one side in the circumferential direction of the second circumferential groove 54 does not exist in the orifice half (40).

  When the outer cylinder fitting 14 is fitted and fixed in a state where the orifice member 198 having such a structure is assembled to the integrally vulcanized molded product 28 of the main rubber elastic body 16, the first concave groove 78 is used. Thus, a low frequency orifice passage (not shown) is formed, and a high frequency orifice passage (not shown) is formed using the second concave groove 80. That is, the low-frequency orifice passage is connected to one liquid chamber 36 a through a connection hole 82 formed in the orifice member 198, and is connected to the other liquid chamber 36 b through an opening at the other circumferential end of the orifice member 198. Has been. The high-frequency orifice passage is connected to the other liquid chamber 36b through an opening at one end in the circumferential direction of the orifice member 198, and a movable rubber film 70 is disposed at the other circumferential end. It is connected to one liquid chamber 36 a through 70.

  Furthermore, as shown in FIG. 22, the housing recess 64 into which the movable rubber film 70 is fitted may be formed in the orifice half 40.

  18 to 22, members and parts having the same structure as that of the first embodiment are denoted by the same reference numerals as those of the first embodiment for easy understanding.

  Further, in the present invention, the movable member is accommodated and disposed in the accommodating space so as to be capable of minute displacement in the thickness direction, so that the hydraulic pressure absorbing action by the minute displacement is exerted, and in the maximum displacement state. It is also possible to employ a movable plate adapted to prevent the fluid from flowing on both sides of the movable member. When a movable plate is adopted as the movable member, the movable plate can be formed of a hard plate such as a synthetic resin in addition to a rubber elastic body. When the movable plate is formed of a hard plate such as a synthetic resin, it is desirable to form a buffer protrusion such as rubber on the contact surface between the movable plate and the inner surface of the accommodation space. Thereby, the hitting sound at the time of contact can be suppressed.

  Furthermore, in the present invention, when the movable film whose outer peripheral edge is supported with the central portion being elastically deformable is adopted as the movable member, the outer peripheral edge of the movable film is not attached to the orifice member or the fitting lid. It may be vulcanized and bonded. Specifically, in the first embodiment, the support portion 72 of the movable rubber film 70 may be vulcanized and bonded to the inner surface of the housing recess 64 of the fitting lid 56.

  Moreover, although the through-hole 46 formed in the bottom wall of the fitting recess 42 is partitioned into four by partition pieces, the number of partitions is not limited to this due to characteristic tuning or the like. In some cases, there may be no partition piece.

  Furthermore, in the present invention, the inner shaft member and the outer cylinder member may be arranged eccentrically as described in JP-A-5-141473.

  In addition, although not listed 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.

It is a longitudinal cross-sectional view which shows the suspension bush of 1st embodiment of this invention, Comprising: The longitudinal cross-sectional view of the II direction of FIG. The cross-sectional view of the suspension bush. The side view of the orifice half body which comprises the orifice member employ | adopted as the suspension bush. The expanded sectional view of the IV-IV direction in FIG. The expanded sectional view of the VV direction in FIG. The top view of the fitting lid employ | adopted as the suspension bush. The rear view of the fitting lid. The expanded sectional view of the VIII-VIII direction in FIG. The expanded sectional view of the IX-IX direction in FIG. The top view of the movable rubber film employ | adopted as the suspension bush. XI-XI sectional drawing in FIG. The top view of the orifice member in which the fitting lid was assembled | attached. The expanded sectional view of the XIII-XIII direction in FIG. The expanded sectional view of the XIV-XIV direction in FIG. The longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention. The perspective view of the orifice member employ | adopted as the engine mount. The side view of the same orifice member. The cross-sectional view which shows the other aspect of the suspension bush to which this invention was applied. The side view which shows the orifice half body employ | adopted with the suspension bush. The cross-sectional view which shows the cylindrical mount to which this invention was applied. The side view which is an orifice member employ | adopted with the same cylindrical mount, Comprising: A fitting lid | cover is shown in the state assembled | attached. Sectional drawing for demonstrating the assembly | attachment state of the orifice member and fitting lid which can be employ | adopted in this invention.

Explanation of symbols

10: Suspension bush, 12: Inner tube bracket, 14: Outer tube bracket, 16: Rubber elastic body, 22: Intermediate sleeve, 24: Window portion, 30a; Pocket portion, 36a: Liquid chamber, 36b: Liquid chamber, 38 : Orifice member, 42: fitting recess, 44: facing inner surface, 56: fitting lid, 58: end face, 68: communication hole, 70: movable rubber film, 76: accommodating space, 88: first orifice passage, 90: second orifice passage, 100: engine mount, 102: first mounting bracket, 104: second mounting bracket, 106: rubber elastic body of main body, 114: metal sleeve, 120: window portion, 126: pocket portion , 166: working fluid chamber, 168: orifice member, 178: second orifice passage, 180: third orifice passage, 190: suspension bush, 192: orifice half, 1 6: cylindrical mount, 198: orifice member

Claims (6)

An outer cylinder member is disposed apart from the outer peripheral side of the inner shaft member, the inner shaft member and the outer cylinder member are connected by a main rubber elastic body, and on one side in the radial direction across the inner shaft member A part of the wall portion is formed of the main rubber elastic body to form a first fluid chamber in which an incompressible fluid is enclosed, and further, the incompressible fluid is disposed on the other radial side across the inner shaft member. Is formed so as to form a second fluid chamber in which a relative pressure fluctuation occurs between the first fluid chamber when a radial vibration is input, and along the inner peripheral surface of the outer cylinder member In a fluid-filled cylindrical vibration isolator in which an orifice member extending in the circumferential direction is provided and an orifice passage communicating the first fluid chamber and the second fluid chamber is formed using the orifice member.
The pocket portion formed by opening on the outer peripheral surface of the main rubber elastic body is covered with the outer cylindrical member to form the first fluid chamber, and the opening of the pocket portion is straddled in the circumferential direction. The orifice member having a structure extending in the circumferential direction is employed, and the orifice member includes a low frequency orifice passage tuned to a low frequency region and a high frequency orifice passage tuned to a high frequency region as the orifice passage. While forming
A fitting recess that opens to the outer peripheral surface is formed in an opening portion of the orifice member to the first fluid chamber of the high-frequency orifice passage from the one axial end surface of the orifice member toward the other axial side. It is formed so as to extend, and the opposite inner surfaces on both sides in the circumferential direction of the fitting recess are formed in a reverse taper shape in which the distance between the opposed surfaces gradually increases from the outer peripheral surface of the orifice member inward in the radial direction. The opposed inner surfaces on both sides in the circumferential direction of the fitting recess that is tapered are formed as a relative inclined surface in which the distance between the opposed surfaces gradually decreases from one side in the axial direction of the orifice member to the other side.
A fitting lid formed with a communication hole that fits into the fitting recess to cover the fitting recess and communicates the high-frequency orifice passage to the first fluid chamber through the fitting recess. The fitting lid is fitted to the fitting recess as a radial reverse tapered surface corresponding to the opposite inner surfaces of the fitting recess on both sides in the circumferential direction and as an axially inclined surface. While fitting and assembling the sliding lid while sliding and sliding in the axial direction,
An accommodation space is formed between the radial overlapping surfaces of the fitting recess and the fitting lid, and a movable member is accommodated and arranged in the accommodation space, and the first is caused at the time of radial vibration input. While allowing the fluid flow through the high-frequency orifice passage based on the displacement of the movable member accompanying the pressure fluctuation of the fluid chamber,
One end surface in the axial direction where the fitting recess of the orifice member opens is overlapped with the inner surface of the pocket portion of the main rubber elastic body, and the fitting lid of the fitting lid fitted into the fitting recess is fitted. Reverse sliding displacement of the orifice member toward one end surface in the axial direction is prevented by contact with the inner surface of the pocket portion, and the fitting lid is prevented from coming out from the fitting recess. A fluid-filled cylindrical vibration isolator characterized by the above.   In a state where the fitting recess is covered with the fitting lid, a groove is formed in the outer circumferential surface of the fitting lid and the outer circumferential surface of the orifice member so as to extend in the circumferential direction. The communication hole is formed in the bottom wall of the intermediate portion in the groove direction of the groove, and the low-frequency orifice passage is formed by covering the concave groove with the outer cylindrical member. The fluid-filled cylindrical vibration isolator according to claim 1, wherein the high-frequency orifice passage is formed by utilizing a part of the high-frequency orifice passage.   A movable rubber film as a movable member is incorporated in the accommodation space, and an outer peripheral edge portion of the movable rubber film is sandwiched between opposing surfaces of the bottom surface of the fitting recess and the inner surface of the fitting lid. In such an assembled state, the movable rubber film has a central portion between the opposing surfaces of the bottom surface of the fitting recess and the inner surface of the fitting lid. 3. The fluid-filled cylindrical vibration isolator according to claim 1 or 2, wherein a gap is provided and elastic deformation displacement of a central portion of the movable rubber film is allowed.   The main rubber elastic body is bonded to the outer peripheral surface of the inner shaft member, and a metal sleeve is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body, and the pocket portion formed in the main rubber elastic body Is opened to the outer peripheral surface through a window portion formed in the metal sleeve, and the window portion of the metal sleeve is covered with the outer cylinder member, so that the pocket portion is covered with the outer cylinder member. The fluid-filled cylindrical vibration isolator according to any one of claims 1 to 3.   The first fluid chamber is formed by forming the pocket portions opened on the outer peripheral surface of the main rubber elastic body on both sides in the direction perpendicular to the axis across the inner shaft member, and covering the pocket portions with the outer cylinder member. Forming the second fluid chamber and adopting the orifice member having a structure extending in the circumferential direction so as to straddle the openings of the pocket portions in the circumferential direction, and the high-frequency orifice passage in the orifice member In both the opening portion to the first fluid chamber and the opening portion to the second fluid chamber, the fitting recesses are formed by fitting the fitting lids into the respective fitting recesses. 5. The fluid-filled cylindrical vibration damping device according to claim 1, wherein the movable member is housed and disposed in the housing space between the overlapping surfaces of the fitting recess and the fitting lid.   By combining the first divided orifice body and the second divided orifice body having a substantially semi-cylindrical shape, the orifice member having a substantially cylindrical shape as a whole is configured. The first divided orifice body and the second divided orifice body The fluid-filled cylindrical vibration isolator according to any one of claims 1 to 5, wherein the low-frequency orifice passage and the high-frequency orifice passage are formed across the gap.

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