JP2009180316A - Fluid sealed cylindrical vibration control device and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid sealed cylindrical vibration control device advantageously improved in the fitting performance and sealing performance of an orifice member. <P>SOLUTION: The orifice member 24 is formed by fixing or embedding two reinforcing bodies 37 and 37 which are formed of rigid members comprising divided cylindrical parts 50 in an orifice member body 36 which is formed of a cylindrical rubber elastic body and has a cut part 34 and a bending part 46 symmetrically to each other at a predetermined interval in the circumferential direction in a state of pinching the cut part 34 between both circumferential ends of the divided cylinder part 50 and in a state of pinching the bending part 46 between other ends thereof. This orifice member 24 is bent by the bending part 46 and assembled in an intermediate sleeve 28 by being enlarged from a direction at a nearly right angle with respect to the shaft so as to constitute a vibration damping device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluid-filled cylindrical vibration isolator and a manufacturing method thereof, and in particular, has two fluid chambers in which an incompressible fluid is sealed, and a fluid action of the sealed fluid between the two fluid chambers. The present invention relates to an improved structure of a fluid-filled cylindrical vibration isolator and a method for advantageously producing such a fluid-filled cylindrical vibration isolator.

  Conventionally, a shaft member that is interposed between two members constituting a vibration transmission system and is attached to one of the members to be vibration-proof connected as a kind of vibration-proof connection body that connects the two members. And an outer cylinder member that is disposed around such a shaft member at a predetermined distance outward in a direction perpendicular to the axis and is attached to the other of the two members. The two fluid chambers, which are connected by a rubber elastic body, and in which a predetermined incompressible fluid is sealed are provided so as to be symmetrically sandwiched with the shaft member interposed therebetween. An orifice passage that communicates with each other is formed, and at the time of vibration input, the incompressible fluid sealed in each of the two fluid chambers can be caused to flow through the orifice passage. Fluid-filled cylindrical vibration proof Location is known.

  Such a fluid-filled cylindrical vibration isolator can obtain an effective anti-vibration effect based on the resonance action of an incompressible fluid that is caused to flow through the orifice passage when vibration is input. It is suitably used as a suspension bushing such as an engine mount, a body mount, a subframe mount, a differential mount, or a strut bar cushion.

  By the way, in this kind of fluid-filled cylindrical vibration isolator, the input vibration of the target vibration isolator is a frequency range corresponding to the ratio of the cross-sectional area and length of the orifice passage. In order to increase the degree of freedom in designing the length and cross-sectional area of the orifice passage, and to expand the tuning range of the vibration frequency of the target vibration-proof object, the orifice passage is placed between the outer cylinder member. For example, Patent Documents 1 and 2 disclose the structure in which the orifice member to be formed is disposed in the opening of the pocket portion of the rubber elastic body that provides the fluid chamber.

  In this case, a shaft member and a rigid intermediate sleeve arranged around the shaft member and spaced outward in the direction perpendicular to the shaft are connected by a main rubber elastic body interposed therebetween. In addition, two pocket portions provided in such a main rubber elastic body are respectively opened on the outer peripheral surface through a window portion provided in the intermediate sleeve, and an orifice groove connecting the two pocket portions is provided on the outer periphery. Using an orifice member provided on the surface, it is fitted into the opening of the pocket portion, and further to the opening of the intermediate sleeve, and the outer tube fitting is fitted over and fixed thereon, so that at least the window described above By covering the portion and the orifice member, two fluid chambers filled with an incompressible fluid are formed corresponding to the two pocket portions and the orifice passage corresponding to the orifice groove. It is configured so that but is formed, is employed.

  However, in such a conventional fluid-filled cylindrical vibration isolator, since the orifice member is composed of a pair of divided structures so as to be arranged with respect to the openings of the two pocket portions, it is inevitably necessary. In addition, an increase in the number of parts and an increase in manufacturing cost is inevitable. Further, since it is necessary to fix the pair of divided structures in a fluid-tight manner between the intermediate sleeve and the outer cylinder member, there is a problem that the divided structures fall off in such assembling work. In addition, the assembly workability is troublesome and inherently difficult.

  For this reason, in Patent Document 3, the orifice member is a single substantially C-shaped member extending in the circumferential direction with a length of a half or more in place of the pair of divided structures, and the circumferential intermediate portion thereof. The orifice member is expanded by forming an axial groove extending linearly continuously in the axial direction so that elastic deformation of the orifice member is allowed at the site where the axial groove is formed. A fluid-filled cylindrical vibration isolator that can be attached to an integrally vulcanized molded product in which a shaft member and an intermediate sleeve are connected by a rubber elastic body. A device has been proposed.

  However, in such a fluid-filled cylindrical vibration isolator, there is a concern that leakage may occur in the seal portion of the orifice member.

  That is, when a substantially C-shaped orifice member is used, generally, such an orifice member is expanded while being elastically deformed and assembled into an integrally vulcanized molded product, and then both end portions in the circumferential direction of the orifice member. However, the seal | sticker between the both ends of this orifice member is ensured by making it contact with the main-body rubber elastic-body part arrange | positioned among them. However, due to dimensional errors that occur during the formation of the orifice member or during the molding of an integrally vulcanized molded product, the dimension between the two end surfaces in the circumferential direction of the orifice member is such that the main rubber elastic body portion positioned between them is positioned. Therefore, there is a possibility that a gap may be formed between the end surface in the circumferential direction of the orifice member and the side surface in the thickness direction of the main rubber elastic body portion. When this happens, there is a concern that the incompressible fluid in the fluid chamber may leak from the gap. In addition, when the outer cylinder fitting is reduced in diameter and fixed to the intermediate sleeve while being externally fitted, the outer cylindrical fitting is fixed between the circumferential end portions of the orifice member and the main rubber elastic body portion. Although the generation of gaps can be eliminated to some extent, it has been difficult to completely eliminate such gaps when the diameter reduction of the outer cylinder fitting is small or when such gaps are large.

JP-A-61-270533 JP 2000-145876 A JP 2006-138430 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that both the assembly property and the sealing property of the orifice member can be effectively enhanced. An object of the present invention is to provide an improved fluid-filled cylindrical vibration isolator. Further, in the present invention, it is an object of the present invention to provide a method capable of advantageously manufacturing such a fluid-filled cylindrical vibration isolator.

  And in the present invention, in order to solve the above-mentioned problem or the problem grasped from the description of the entire specification and the drawings, it can be advantageously implemented in various aspects as listed below, Moreover, each aspect described below can be employed in any combination. The aspects or technical features of the present invention are not limited to those described below, but can be recognized based on the description of the entire specification and the inventive concept disclosed or suggested in the drawings. It should be understood that there is.

[1] A shaft member and a rigid intermediate sleeve arranged around the shaft member so as to be spaced outward in the direction perpendicular to the shaft are connected by a main rubber elastic body interposed therebetween. On the other hand, the first and second pocket portions provided symmetrically in the main rubber elastic body are opened to the outer peripheral surface through the window portion provided in the intermediate sleeve, and the opening is further covered. In a state where the outer cylindrical fitting is externally fitted to the intermediate sleeve, the diameter is reduced and fixed, so that the incompressible fluid corresponding to the first and second pocket portions is sealed. An orifice member that symmetrically forms the first and second fluid chambers and has an orifice groove on the outer peripheral surface that connects the two pocket portions to each other is disposed between the intermediate sleeve and the outer cylinder member. To extend circumferentially between two fluid chambers By disposing, an orifice passage that allows the two fluid chambers to communicate with each other corresponding to the orifice groove is formed, and the incompressible fluid in the two fluid chambers can be caused to flow through the orifice passage. In the fluid-filled cylindrical vibration isolator configured as described above, the orifice member is made of (a) a cylindrical rubber elastic body provided with a circumferential groove forming the orifice groove on the outer circumferential surface, and An orifice member main body provided at one place above, which is cut at an axially extending cut portion and can be expanded by bending at a bent portion positioned symmetrically with the cut portion; (B) two rigid members each having a divided cylindrical portion having a circumferential length less than a half circumference of the orifice member main body, and each divided cylindrical portion of the two rigid members is arranged around the circumference of the orifice member main body. Along the ditch The orifice member main body is positioned so as to be coaxial with each other, and one end portion in the circumferential direction of each of the divided cylindrical portions is a circumference sandwiching the cut portion of the orifice member main body. The other ends in the circumferential direction are arranged at a predetermined distance on both sides in the direction, and the other ends in the circumferential direction are arranged on both sides in the circumferential direction with the bent portion of the orifice member body interposed therebetween. And two reinforcing bodies that are fixed or embedded in the orifice member body and reinforce the orifice member body, and the orifice member is folded in the orifice member body. The intermediate sleeve can be assembled to the intermediate sleeve from a direction perpendicular to the axis by being bent and expanded at the curved portion, and the intermediate sleeve can be attached to the intermediate sleeve in the assembled state. The orifice member is sandwiched between the intermediate sleeve and the outer tube fitting while the orifice member body is elastically deformed by reducing the diameter of the outer tube fitting fitted outside. Fluid-filled cylindrical vibration isolator.

[2] On the both sides in the width direction of the outer peripheral surface of the divided cylindrical portion in the reinforcing body, vertical wall portions that are opposed to each other and extend continuously in the circumferential direction are respectively erected integrally, and the divided cylindrical portion is The fluid-filled cylinder according to the above aspect [1], wherein the vertical wall portion is fixed or embedded in a side wall portion of the circumferential groove while being fixed or embedded in a bottom portion of the circumferential groove of the orifice member main body. Anti-vibration device.

[3] An outer flange that protrudes outward in the opposing direction of the two side wall portions and extends continuously in the circumferential direction at an end of the reinforcing body opposite to the divided cylindrical portion side of the vertical wall portion. The fluid-filled cylindrical vibration damping device according to the above aspect [1] or [2], in which the portions are integrally formed.

[4] The fluid-filled cylindrical vibration damping device according to the above aspect [3], wherein an outer flange portion of the vertical wall portion in the reinforcing body is fixed or embedded in the orifice member body.

[5] The circumferential length of the outer flange portion of the vertical wall portion in the reinforcing body is made larger than the circumferential length of the divided cylindrical portion, and the outer flange is formed at the circumferential end portion of the reinforcing body. The fluid-filled cylindrical shape according to the above aspect [3] or [4], wherein an end edge in the circumferential direction of the portion protrudes outward in the circumferential direction from an end edge in the circumferential direction of the divided cylindrical portion Anti-vibration device.

[6] <A> A shaft member, and a rigid intermediate sleeve arranged around the shaft member and spaced outward in a direction perpendicular to the shaft are attached to the main rubber elastic body interposed therebetween. The first pocket portion and the second pocket portion provided symmetrically in the main rubber elastic body are opened to the outer peripheral surface through a window portion provided in the intermediate sleeve. A step of preparing a sulfur molded product, and <a> (a) a circumferential groove formed on the outer circumferential surface of a cylindrical rubber elastic body having a circumferential length less than one circumference, and one place on the circumference An orifice member body which is cut at an axially extending cut portion and is opened by bending at a bent portion positioned symmetrically with the cut portion; and (b) the Two parts having a divided cylindrical part having a circumferential length less than a half circumference of the orifice member body And each of the divided cylindrical portions of the two rigid members is positioned coaxially with the orifice member main body so as to extend along the circumferential groove of the orifice member main body, and each of the divided cylindrical portions. One end in the circumferential direction of the orifice member is disposed on both sides in the circumferential direction sandwiching the slit portion of the orifice member main body with a predetermined distance from each other, and further, the other end in the circumferential direction The orifice member main body is fixed or embedded in the orifice member main body in a state where they are arranged at a predetermined distance from each other on both sides in the circumferential direction sandwiching the bent portion of the orifice member main body. A step of preparing an orifice member including two reinforcing bodies that reinforce the structure, and <c> bending the orifice member at a bent portion of the orifice member main body to expand it into the integrally vulcanized molded product. Axial direction Is assembled so as to extend in the circumferential direction between the first and second pocket portions, and then the outer cylinder fitting is externally fitted to the intermediate sleeve of the integrally vulcanized molded product. The orifice member main body is elastically deformed by reducing the diameter, and the orifice member is clamped between the intermediate sleeve and the outer tube fitting, and <d> the intermediate portion of the outer tube fitting. Non-compressed by fixing the outer tube fitting to the intermediate sleeve by a reduced diameter in a state of external fitting to the sleeve, and covering the first pocket portion and the second pocket portion fluid-tightly. And forming the first fluid chamber and the second fluid chamber symmetrically filled with the ionic fluid, and covering the circumferential groove of the orifice member with the outer cylinder member. Orifice passage communicating with the second fluid chamber Method of manufacturing a fluid-filled cylindrical vibration damping device which comprises the step of forming.

  In such a fluid-filled cylindrical vibration isolator having a structure according to the present invention, the orifice member is formed by fixing or embedding two reinforcing bodies on a cylindrical orifice member body having a slit portion. It is composed of a single member, and can be assembled to the intermediate sleeve from the direction perpendicular to the axis while being expanded by bending at the bent portion. Therefore, like the conventional C-shaped orifice member, the excellent assembling property for the intermediate sleeve can be exhibited very advantageously. Further, the circumferential ends of the respective divided cylindrical portions of the two reinforcing bodies are positioned at a predetermined distance from each other on both sides in the circumferential direction sandwiching the bent portion of the orifice member body made of a rubber elastic body. From the place where it is fastened, the orifice member can be easily bent with a relatively small force at the bent portion of the orifice member body without being obstructed by the rigid reinforcing body. Assembling property of the orifice member to the intermediate sleeve can be effectively enhanced.

  In the fluid-filled cylindrical vibration isolator according to the present invention, in particular, the orifice member main body is cut by a slit extending in the axial direction at one place on the circumference of the cylindrical rubber elastic body. In the assembled state of the orifice member to the intermediate sleeve, the orifice member body is formed in a cylindrical shape before being expanded in diameter, and the end surfaces (cut surfaces) of the cut portions are formed between each other. Are brought into direct contact with each other. Therefore, the conventional C-shaped orifice member having a structure in which both end portions in the circumferential direction of the orifice member are brought into contact with the main rubber elastic body portion positioned between them in the assembled state to the intermediate sleeve. Unlike the case, it is possible to advantageously eliminate the formation of a gap between the circumferential ends of the orifice member (end faces of the cut portion of the orifice member main body) due to a dimensional error or the like.

  Moreover, such an orifice member is sandwiched between the intermediate sleeve and the outer tube fitting that is externally fitted, reduced in diameter, and fixed, in the assembled state to the intermediate sleeve. . Therefore, when the cut portion is formed by cutting at one place on the circumference of the orifice member body, even if a fine gap is formed between the end faces of the cut portion, the outer cylinder fitting When the diameter is reduced, the orifice member body portion that is compressed and elastically deformed gathers in the peripheral portion of the cut portion where no rigid reinforcing body exists, whereby the end faces of the cut portion are Pressing with a larger force, the fine gap can be completely eliminated.

  Therefore, in the fluid-filled cylindrical vibration isolator according to the present invention as described above, the assembling property of the orifice member can be advantageously improved, and the sealing property of the orifice member can be extremely effectively enhanced. It can be done. As a result, in addition to the improvement in manufacturability being effectively realized, the desired vibration isolating effect can be effectively and stably exhibited over a longer period.

  And in the manufacturing method of the fluid-filled cylindrical vibration isolator according to the present invention, since the orifice member exhibiting the excellent characteristics as described above is used, the assembly property of the orifice member and the more sufficient A fluid-filled cylindrical vibration isolator capable of exhibiting sealing performance very effectively can be advantageously manufactured.

  First, FIG. 1 shows a suspension bush of an automobile as an embodiment of a fluid-filled cylindrical vibration isolator according to the present invention in a vertical cross-sectional form, and FIG. 2 shows a cross section of the suspension bush. The surface morphology is shown. In these drawings, the suspension bush 10 is coaxially positioned with a predetermined distance outwardly in the radial direction (perpendicular to the axis) around the inner cylinder fitting 12 as an axial member. The outer cylinder fitting 14 is further provided, and the inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected by a main rubber elastic body 16 interposed between the two fittings 12 and 14. It is structured.

  In this case, a pivot (not shown) or the like (not shown) is inserted into the inner hole 18 of the inner cylinder fitting 12, and the inner cylinder fitting 12 is attached to one of the two members to be vibration-proof connected. On the other hand, the outer cylindrical metal fitting 14 is attached to the other of the two members via a predetermined fitting, and is mainly in the radial direction (perpendicular to the axis) in the vertical direction in FIG. The intended vibration-proof characteristics can be exhibited with respect to the vibration load input to.

  Further, in such a suspension bush 10, the first and second pair of pocket portions 20 a and 20 b are symmetrical with respect to the central axis with respect to the main rubber elastic body 16 with the inner cylinder fitting 12 interposed therebetween. Provided. And each opening part of these 1st and 2nd pocket parts 20a and 20b is covered with the outer cylinder metal fitting 14, and the 1st and 2nd pair with which predetermined | prescribed incompressible fluid was enclosed Fluid chambers 22a and 22b are formed. Further, a single orifice member 24 having a thick cylindrical shape as a whole extends in the circumferential direction between the first and second pocket portions 20a, 20b, that is, a pair of pocket portions 20a. , 20b so as to be bridged over. The orifice member 24 and the outer cylinder fitting 14 form an orifice passage 26 that allows the first and second fluid chambers 22a and 22b to communicate with each other.

  More specifically, as shown in FIGS. 3 to 7, the inner cylinder fitting 12 and the main rubber elastic body 16 are configured as an integrally vulcanized molded product 30 together with a metal sleeve 28 as an intermediate sleeve. That is, the inner cylindrical metal fitting 12 having a thick, small-diameter cylindrical shape and the stepped cylindrical metal sleeve 28 spaced apart radially outward are integrally vulcanized with the main rubber elastic body 16. By operation, the main rubber elastic body 16 is connected to form an integrally vulcanized molded product 30.

  As apparent from FIGS. 5 to 6, the metal sleeve 28 has a large diameter having an axial length substantially corresponding to the thickness of the wall portions of the pocket portions 20a and 20b on both end sides in the axial direction. A pair of window portions 28c, 28a, 28a is formed by having a stepped cylindrical shape in which the intermediate portion in the axial direction is a small diameter portion 28b, and the cylindrical wall portion is cut into a large rectangular shape. 28c is provided symmetrically with respect to the central axis. And the 1st and 2nd pocket parts 20a and 20b opened by the outer peripheral surface through the window part 28c of such a metal sleeve 28 are formed symmetrically on both sides of the inner cylinder metal fitting 12. As shown in FIG.

  3, 5, and 7, both axial ends of both sides of the small-diameter portion 28 b divided into two by the two windows 28 c, 28 c of the metal sleeve 28 are provided. Further, the positioning convex portions 32 and 32 having a rectangular planar shape extending from the large-diameter portions 28a and 28a at substantially the same height have a predetermined length in the axial direction by the rubber elastic body material wrapped around the main rubber elastic body 16. Each is provided so as to protrude.

  On the other hand, the orifice member 24 that forms the orifice passage 26 between the outer peripheral fitting 14 and the inner peripheral surface thereof by the external fitting is an orifice member main body made of a rubber elastic body as shown in FIGS. 36 and an integral vulcanization molded product having two reinforcing bodies 37, 37 embedded in the orifice member main body 36, are configured as a single member.

  More specifically, the orifice member main body 36 has a cylindrical shape as a whole, has a relatively thick wall thickness, an outer diameter substantially the same as the outer diameter of the large diameter portion 28a of the metal sleeve 28, and the small diameter portion 28b. The inner diameter is substantially the same as the outer diameter, and the axial length of each window portion 28c of the metal sleeve 28 is substantially the same as the axial length (see FIG. 1).

  Further, a circumferential groove 38 extending in the circumferential direction length that does not reach one circumference is formed in the central portion in the width direction (axial direction) of the outer peripheral surface of the orifice member main body 36. The circumferential groove 38 has a rectangular cross section surrounded by a bottom 40 having a thickness less than half of the thickness of the orifice member body 36 and two sufficiently thick side walls 42, 42. ing. In addition, one rectangular through hole 44 is provided at each end of the bottom 40 of the circumferential groove 38 in the circumferential direction so as to penetrate the circumferential groove 38 in the thickness direction.

  In the orifice member main body 36, as shown in FIGS. 8 and 9, the portion between the circumferential ends of the circumferential groove 38, that is, the circumferential central portion of the portion where the circumferential groove 38 is not formed. A slit 34 extending in a straight line in the axial direction is formed and cut in the circumferential direction. Further, a portion that is positioned symmetrically with the formation portion of the cut portion 34 is a bent portion 46. Thereby, the orifice member main body 36 can be expanded by being bent at the bent portion 46 (see FIG. 14).

  In addition, positioning recesses 48 are respectively formed on the side surfaces of both sides in the axial direction of the formation portion of the cut portion 34 and the formation portion of the bent portion 46 in the orifice member main body 36. Each of these positioning recesses 48 has a rectangular shape, and has a size that allows the rectangular positioning protrusions 32 provided on the outer surface of the small diameter portion 28b of the metal sleeve 28 in the integrally vulcanized molded product 30 to enter. (See FIG. 1).

  On the other hand, as is clear from FIGS. 10 to 12, the two reinforcing bodies 37, 37 embedded in the orifice member main body 36 are divided into a divided cylindrical portion 50 having a divided cylindrical shape and the divided cylindrical portion 50. The cross section is substantially U-shaped and integrally has two divided annular plate-like vertical wall portions 52, 52 that extend in the circumferential direction opposite to each other on both sides in the width direction (axial direction) of the outer peripheral surface of It is made of a metal member. Further, the end of each vertical wall portion 52 opposite to the divided cylindrical portion 50 side protrudes by a predetermined height toward the outer side in the width direction of the divided cylindrical portion 50 (the outer side in the opposite direction of the vertical wall portions 52), Further, the outer flange portion 54 extending continuously in the circumferential direction of the vertical wall portion 52 (the divided cylindrical portion 50) has a divided cylindrical shape having a larger diameter than the divided cylindrical portion 50 and a sufficiently small axial length, and is integrally formed. Has been. Further, a through hole 56 is formed in a portion that is offset from the one end portion in the circumferential direction of the divided cylindrical portion 50 to the center by a predetermined dimension. The through hole 56 has a rectangular shape corresponding to the through hole 44 provided in the bottom portion 40 of the orifice member main body 36.

  In each of the reinforcing bodies 37, the divided cylindrical portion 50 is provided in the orifice member main body 36 with a wall thickness that is thinner than the thickness of the bottom portion 40 of the orifice member main body 36 and an inner diameter that is slightly larger than the inner diameter of the bottom portion 40. The circumferential groove 38 has a circumferential length shorter than half of the circumferential length. Further, the vertical wall portion 52 has the same thickness as that of the divided cylindrical portion 50 and a height lower than that of the side wall portion 42 of the orifice member main body 36, and the outer flange portion 54 is larger than the thickness of the side wall portion 42. Also has a small protruding height.

  The two divided cylindrical portions 50 of the two reinforcing bodies 37 are positioned so as to be coaxial with the orifice member main body 36 and extend along the circumferential groove 38 provided on the outer peripheral surface of the orifice member main body 36. In this state, it is embedded in the bottom portion 40 of the orifice member main body 36. Further, two vertical wall portions 52, 52 and outer flange portions 54, 54 formed integrally therewith are respectively embedded in the two side wall portions 42, 42 of the orifice member main body 36.

  As a result, the two reinforcing bodies 37 are embedded in the orifice member main body 36 in a state where they are positioned coaxially therewith, so that the orifice member 24 is connected to the orifice member main body 36 and the two reinforcing bodies 37, 37. 37 is formed as an integral vulcanized molded product, and an orifice groove 58 formed of a circumferential groove 38 of the orifice member main body 36 is formed on the outer peripheral surface of the orifice member 24.

  And in such an orifice member 24, the circumferential direction which the edge part of the circumferential direction of the two division | segmentation cylindrical parts 50 pinched | interposed the cut part 34 in the non-formation site | part of the orifice groove | channel 58 (circumferential groove 38) in between. The other end portions in the circumferential direction are spaced from each other on both sides in the circumferential direction sandwiching the bent portion 46 of the orifice member main body 36 therebetween. They are positioned apart. In other words, the cut portion 34 and the bent portion 46 are formed so as to be symmetrically located in a portion where the two reinforcing bodies 37 are not embedded.

  Thus, as will be described later, after the orifice member 24 is obtained as an integrally vulcanized molded product comprising the orifice member main body 36 and the two reinforcing bodies 37, 37, the two reinforcing bodies 37, 37 are not embedded. The cut portion 34 can be easily formed by simply cutting the circumferential central portion of one of the two portions in the axial direction, and the orifice by bending at the bent portion 46 is also possible. The expansion of the member main body 36 and the expansion of the orifice member 24 can be performed smoothly without being obstructed by the two reinforcing bodies 37 and 37.

  Further, in the orifice member 24, through holes 56 provided in the divided cylindrical portions 50 of the respective reinforcing bodies 37 are provided at both ends of the bottom portion 40 of the orifice groove 58 formed of the circumferential groove 38 of the orifice member main body 36. It corresponds to the through hole 44. Thus, one through hole 60 that opens the orifice groove 58 toward the inside of the orifice member 24 is formed at each end in the circumferential direction of the orifice groove 58 by the through hole 44 and the through hole 56. ing.

  Further, a thin seal rubber layer 62 is formed on the outer peripheral surfaces of the outer flange portions 54 of the two reinforcing bodies 37, 37. Thereby, as will be described later, when the orifice member 24 is sandwiched between the metal sleeve 28 and the outer cylinder fitting 14, the gap between the outer peripheral surface of the orifice member 24 and the inner circumference surface of the outer cylinder fitting 14 is The seal rubber layer 62 of each outer flange portion 54 of the orifice member 24 and the thin seal rubber film 64 fixed on the entire inner peripheral surface of the outer cylinder fitting 14 are surely sealed.

  Here, as shown in FIGS. 11 and 13, both end portions in the circumferential direction of each reinforcing body 37 spread from the inner side toward the outer side at both end edges in the circumferential direction of the respective vertical wall portions 52. Is a form that is cut so as to be drawn (an inclined form that is inclined outward in the circumferential direction from the inside toward the outside). Thereby, the circumferential direction length of the outer flange part 54 is made longer than the circumferential direction length of the divided cylindrical part 50, and the circumferential edge of the outer flange part 54 is the circumferential edge of the divided cylindrical part 50. Rather than projecting outward in the circumferential direction. In other words, the circumferential edge of the outer flange portion 54 located with the cut portion 34 interposed therebetween is cut more than the circumferential edge of the divided cylindrical portion 50 located with the cut portion 34 interposed therebetween. The divided cylindrical portion 50 is located close to the flange portion 34, and the circumferential edge of the outer flange portion 54 positioned with the bent portion 46 interposed therebetween is positioned with the bent portion 46 interposed therebetween. It is positioned closer to the circumferential central portion of the bent portion 46 than the circumferential edge. Here, the outer flange portion 54 located at the position where the positioning recess 48 of the orifice member main body 36 is formed is narrower by a predetermined dimension than the other outer flange 54 portions.

Thus, in the present embodiment, as shown in FIG. 13, among the end portions in the circumferential direction of the two reinforcing bodies 37, particularly, the end portions located on both sides in the circumferential direction with the bent portion 46 interposed therebetween. Of the orifice member main body 36 located between the edges of the divided cylindrical portion 50, the length L ₁ in the circumferential direction of the orifice member main body 36 located between the edges of the outer flange portion 54. circumferential length of: is longer than L _2. Thereby, when the bending part 46 is bent, the orifice member 24 is devised so that it can be expanded more smoothly with a sufficient amount of rubber (the bending part 46 has more rubber). The orifice member 24 can be expanded more smoothly by being expanded in quantity. On the other hand, each outer flange portion 54 and the circumferential length of the seal rubber layer 62 formed on the outer peripheral surface thereof are made as long as possible, so that the orifice member 24 is connected to the metal sleeve 28. And the outer cylinder fitting 14, the seal rubber layer 62 is held and pressed by each outer flange portion 54 and the outer cylinder fitting 14 with a longer circumferential length. As a result, the sealing performance between the outer peripheral surface of the orifice member 24 and the inner peripheral surface of the outer cylindrical fitting 14 is further improved while ensuring smooth expansion by easy bending at the bent portion 46 as described above. It can be secured effectively.

  By the way, the suspension bush 10 of this embodiment having such a structure is manufactured, for example, according to the following procedure.

  That is, by performing a known vulcanization molding operation, an integrally vulcanized molded product 30 having a structure as shown in FIGS. 5 to 7 is manufactured.

  Further, the orifice member 24 having a structure as shown in FIGS. 8 to 13 is manufactured by a known vulcanization molding operation different from that without the cut portion 34. That is, first, the orifice member 24 is molded in a state in which the two reinforcing bodies 37 are embedded in the cylindrical orifice member main body 36 having no cut portion. Thereafter, the end portions in the circumferential direction of the two reinforcing bodies 37 are separated from each other, and the two orifice member main body 36 portions facing each other in the radial direction in which the respective reinforcing bodies 37 do not exist inside (rubber elastic body only) Of the portion in which the through-hole 60 is formed in the vicinity thereof is cut by, for example, a cutting blade or the like, and the cutting portion 34 is formed by the cutting portion. Further, a portion located on the opposite side in the radial direction from the formation side of the cut portion 34 is a bent portion 46. As a result, the orifice member 24 made of a single member, in which the cut portion 34 and the bent portion 46 are provided in a portion symmetrically positioned with respect to the central axis, is obtained.

  Thereafter, the orifice member 24 thus obtained is fitted (fitted) to the integrally vulcanized molded product 30 manufactured separately. For example, as shown in FIG. 14, the fitting operation is performed by elastically deforming the bent portion 46 by the slit portion 34 in which the orifice member 24 is bent at the bent portion 46 and positioned symmetrically. By utilizing the action, it is greatly expanded and opened, and in this state, the orifice member 24 is relative to the integrally vulcanized molded product 30 from the direction perpendicular to the axis through the expanded opening. It is carried out by inserting it automatically.

  Then, as shown in FIGS. 15 and 16, the orifice member 24 is fitted into the integral vulcanization molded product 30, and the assembled body 66 assembled is obtained. In addition, in the orifice member 24 fitted to the integrally vulcanized molded product 30 in the assembly 66, from the expanded state where the bent portion 46 is bent, by the elastic deformation action of the bent portion 46, The cylindrical shape before the expansion is restored, and the end faces (cut surfaces) in the circumferential direction of the orifice member main body 36 formed by the cut portions 34 are brought into contact with each other without a gap.

  Further, when the assembly 66 is formed, the vulcanization molding is integrally performed in the positioning recesses 48 provided on both side surfaces of the cut portion 34 forming portion and the bent portion 46 forming portion of the orifice member 24. The positioning protrusion 32 formed on the product 30 is brought into the entry position. Thereby, the formation part of the cut part 34 and the formation part of the bent part 46 of the orifice member 24 are formed in the first and second pocket parts 20 a and 20 b of the metal sleeve 28 in the integrally vulcanized molded product 30. The two small-diameter portions 28b are separated from each other on the outer peripheral surface, and the two through holes 60, 60 of the orifice member 24 are provided with the first and second pocket portions 20a of the integrally vulcanized molded product 30. , 20b are positioned so as to communicate with each other.

  Next, after the outer cylinder fitting 14 is fitted on the outer peripheral surface of the assembly 66 obtained as described above, a known method such as an eight-way stop is applied to the outer cylinder fitting 14. The outer diameter metal fitting 14 is fixed to the assembly 66 (metal sleeve 28) by reducing the diameter.

  Thereby, the orifice member main body 36 portion (the formation part of the cut part 34 and the formation part of the bent part 46) located on the outer peripheral surface of the small diameter part 28b of the metal sleeve 28 is separated from the outer peripheral surface of the small diameter part 28b. The orifice member 24 is sandwiched and fixed between the metal sleeve 28 and the outer tubular fitting 14 while being elastically deformed by being sandwiched between the inner circumferential surface of the tubular fitting 14.

  At this time, the rubber part located at the circumferential end of each reinforcing body 37 of the orifice member main body 36 elastically compressed and deformed by the clamping force between the metal sleeve 28 and the outer cylindrical fitting 14 is The reinforcing body 37 is gathered at the formation part of the cut part 34 and the formation part of the bent part 46. Thereby, especially in the formation site | part of the cutting part 34 of the orifice member main body 36, the end surfaces (cut surface) of the cutting part 34 which mutually contacts are press-contacted by bigger force. For this reason, even when a fine gap is formed between the end faces of the cut portion 34 when the cut portion 34 is formed, the outer cylinder fitting 14 is attached to the metal sleeve 28 to which the orifice member 24 is assembled. When the diameter is reduced and fixed in a state of being externally fitted, the fine gap between the end faces of the cut portion 34 can be completely eliminated.

  Further, by fixing the outer cylinder fitting 14 to the assembly 66 (metal sleeve 28), the first and second pocket portions 20a and 20b of the main rubber elastic body 16 are sealed rubber inside the outer cylinder fitting 14. First and second fluid chambers 22a and 22b corresponding to the first and second pocket portions 20a and 20b are formed on the inner peripheral surface of the membrane 64 so as to be fluid-tightly covered. At the same time, the orifice groove 58 of the orifice member 24 is also fluid-tightly covered with the inner peripheral surface of the seal rubber film 64 inside the outer cylinder fitting 14, so that the first and second fluids formed simultaneously. A single orifice passage 26 having a predetermined length and a cross-sectional area of the flow path that allows the chambers 22a and 22b to communicate with each other through the through holes 60 is formed. Thus, the suspension bush 10 as shown in FIGS. 1 and 2 is completed.

  Thus, in the suspension bush 10 of the present embodiment, the orifice member 24 made of a single cylindrical member having the cut portion 34 is expanded by bending at the bent portion 46, The integrated vulcanized molded product 30 (metal sleeve 28) can be assembled by being fitted from the direction perpendicular to the axis. Therefore, the excellent assembling property for the metal sleeve 28 can be exhibited very advantageously. Further, since the bent portion 46 of the orifice member 24 is formed of only the rubber portion without any reinforcing member 37 embedded in the orifice member 24, the orifice member 24 has such a configuration. The bent portion 46 can be easily bent with a relatively small force, and the assembly of the orifice member 24 to the integrally vulcanized molded product 30 can also be effectively improved. . Thus, excellent manufacturability can be ensured extremely advantageously.

  In the suspension bushing 10, the end surfaces of the cut portion 34 of the orifice member 24 sandwiched between the outer cylinder fitting 14 and the metal sleeve 28 are located between the outer cylinder fitting 14 and the metal sleeve 28. It is possible to advantageously avoid the occurrence of a gap between the end surfaces due to pressure contact with each other based on the clamping pressure. Therefore, the sealing performance around the first and second fluid chambers 22a and 22b and the orifice passage 26 can be more sufficiently secured. As a result, the desired vibration isolation effect can be effectively and stably exhibited over a longer period.

  Further, in the present embodiment, the outer flange portion 54 is formed on each of the two metal reinforcing bodies 37, 37 embedded in the orifice member 24, and the outer flange portion 54 is further formed on the orifice member main body 36. By being embedded, a seal rubber layer 62 is provided on the outer peripheral surface of the outer flange portion 54. Such a seal rubber layer 62 is sandwiched between the outer cylinder fitting 14 and the outer flange portion 54. Also by this, the sealing performance around the first and second fluid chambers 22a and 22b and the orifice passage 26 can be effectively enhanced.

  Moreover, in the suspension bush 10 of this embodiment, the circumferential end portions of the outer flange portions 54 of the two reinforcing bodies 37 and 37 located between the bent portions 46 of the orifice member 24 are sandwiched therebetween. While being narrowed, while between the circumferential ends of each divided cylindrical portion 50 is widened, while ensuring a smooth expansion by easy bending at the bent portion 46, The sealability between the outer peripheral surface of the orifice member 24 and the inner peripheral surface of the outer cylinder fitting 14 can be more effectively ensured. Therefore, both the excellent assembling property of the orifice member 24 to the integrally vulcanized molded product 30 and the sufficient sealing performance around the first and second fluid chambers 22a and 22b and the orifice passage 26 are both higher. It can be used advantageously at the level.

  Further, in the present embodiment, the divided cylindrical portion 50 of each reinforcing body 37 is embedded in the bottom 40 of the orifice groove 58 (circumferential groove 38) of the orifice member main body 36 constituting the orifice passage 26, and each vertical wall portion. 52 are embedded in the respective side wall portions 42 of the orifice groove 58, and when the orifice member 24 is clamped between the metal sleeve 28 and the outer cylinder fitting 14, the orifice groove is caused by the clamping pressure. It is possible to advantageously prevent the bottom 40 of the 58 and the side walls 42 from being deformed. As a result, the flow passage cross-sectional area of the orifice passage 26 is stably ensured, so that desired vibration isolation characteristics can be advantageously exhibited.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, a pair of symmetrical pocket portions 20a and 20b (fluid chambers 22a and 22b) are provided on both sides of the inner cylinder fitting 12, but such a pocket portion 20 is A plurality of structures can be provided in the same structure as the conventional one, and the arrangement form is appropriately set. In addition, the size of the pair of pocket portions 20a and 20b may be the same size or different sizes.

  Further, even in the arrangement form of the orifice passage 26, the arrangement form of the orifice groove 58 is provided so that an orifice passage having a flow path cross-sectional area and a length corresponding to the target vibration frequency of the vibration isolation target can be provided. By appropriately selecting, it is set appropriately.

  Moreover, the inner cylinder metal fitting 12 and the outer cylinder metal fitting 14 are concentrically positioned as illustrated, and are connected to each other by the main rubber elastic body 16 in an eccentricly positioned form. In the case of the eccentric arrangement, when the initial load is applied, in general, the inner cylinder fitting 12 and the outer cylinder fitting 14 are eccentric so that they are concentrically positioned, and the main rubber elastic body 16 will be connected.

  Further, as the material of the rubber elastic body constituting the main rubber elastic body 16 and the orifice member main body 36 and the incompressible fluid sealed in the fluid chamber 22, known ones are employed. For example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is employed as the incompressible fluid, but generally a low-viscosity fluid of 0.1 Pa · s or less is preferably used.

  Furthermore, in the above-described embodiment, the two reinforcing bodies 37 are embedded in the orifice member main body 36. For example, each reinforcing body 37 is attached to the inner peripheral surface or the outer peripheral surface of the orifice member main body 36. It may be fixed.

  The material of the reinforcing body 37 may be a material other than the exemplified metal as long as it has rigidity. Furthermore, the reinforcement body 37 should just have the division | segmentation cylindrical part 50 at least, Therefore, the vertical wall part 52 and the outer flange part 54 can also be abbreviate | omitted.

  Furthermore, when the outer flange portion 54 is formed on the reinforcing body 37, a rubber portion (for example, a seal rubber film) that seals between the outer cylinder bracket 14 and the outer flange portion 54 on the inner peripheral surface of the outer cylinder bracket 14 is provided. 64), the outer flange portion 54 can be protruded from the side wall portion 42 of the orifice member main body 36 without being fixed or embedded in the orifice member main body 36.

  In the above embodiment, the intermediate sleeve is constituted by the metal sleeve 28, but the material of the intermediate sleeve is not particularly limited to metal as long as it has rigidity.

  In addition, in the said embodiment, although the specific example of what applied this invention to the suspension bush of a motor vehicle and its manufacturing method was shown, this invention is for various motor vehicles, such as an engine mount of a motor vehicle, and a body mount. The present invention can be advantageously applied to the fluid-filled cylindrical vibration isolator, various fluid-filled cylindrical vibration-proof devices used in addition to automobiles, and methods of manufacturing these vibration-proof devices. Of course.

  In addition, although not enumerated one by one, the present invention can be implemented 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 any of the embodiments falls within the scope of the present invention without departing from the spirit of the present invention.

It is a longitudinal cross-sectional explanatory drawing which shows one Embodiment of the suspension bush which has a structure according to this invention, Comprising: It is a figure equivalent to the II cross section of FIG. FIG. 2 is a cross-sectional explanatory view of the suspension bush shown in FIG. 1. It is front explanatory drawing of the integral vulcanization molded product used for the suspension bush shown by FIG. It is right side explanatory drawing of the integral vulcanization molded product shown by FIG. It is a VV cross-sectional explanatory drawing in FIG. It is VI-VI cross-section explanatory drawing in FIG. It is VII-VII cross-section explanatory drawing in FIG. It is front explanatory drawing of the orifice member used for the suspension bush shown by FIG. It is a back surface explanatory view of the orifice member shown in FIG. It is XX cross-section explanatory drawing in FIG. It is XI-XI cross-section explanatory drawing in FIG. It is XII-XII cross-section explanatory drawing in FIG. FIG. 13 is an enlarged explanatory view of a part XIII in FIG. 11. In the suspension bush shown in FIG. 1, it is explanatory drawing which shows the state which assembled | attached the orifice member to the integral vulcanization molded product. It is front explanatory drawing of the assembly which comprises the suspension bush shown by FIG. 1 by which an orifice member is assembled | attached to an integral vulcanization molded product. It is back surface explanatory drawing of the assembly | attachment body shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suspension bush 12 Inner cylinder metal fitting 14 Outer cylinder metal fitting 16 Main body rubber elastic body 20 Pocket part 22 Fluid chamber 24 Orifice member 26 Orifice passage 28 Metal sleeve 34 Cutting part 36 Orifice member main body 37 Reinforcement body 46 Bending part 50 Divided cylinder part 58 Orifice groove 62 Seal rubber layer

Claims (6)

A shaft member and a rigid intermediate sleeve arranged around the shaft member and spaced apart outward in the direction perpendicular to the shaft are connected by a main rubber elastic body interposed therebetween, The intermediate sleeve is formed so that the first and second pocket portions provided symmetrically in the rubber elastic body of the main body are opened on the outer peripheral surface through the window portion provided in the intermediate sleeve, and the opening portion is further covered. The first and second incompressible fluids corresponding to the first and second pocket portions are respectively sealed by reducing the diameter in a state in which the outer cylindrical fitting is externally fitted to the first pocket portion and fixing the outer cylindrical fitting. The two fluid chambers are formed symmetrically, and an orifice member having an orifice groove on the outer peripheral surface for connecting the two pocket portions to each other is disposed between the intermediate sleeve and the outer cylinder member. To extend in the circumferential direction between In this way, an orifice passage that communicates the two fluid chambers with each other corresponding to the orifice groove is formed so that the incompressible fluid in the two fluid chambers can flow through the orifice passage. A fluid-filled cylindrical vibration isolator configured,
The orifice member comprises:
It is made of a cylindrical rubber elastic body provided with a circumferential groove forming the orifice groove on the outer peripheral surface, and is cut at an axially extending cut portion provided at one place on the circumference. An orifice member body that can be expanded by bending at a bent portion that is symmetrical to the portion;
The rigid member includes two rigid members each having a divided cylindrical portion having a circumferential length less than a half circumference of the orifice member main body, and each divided cylindrical portion of the two rigid members extends along a circumferential groove of the orifice member main body. So that the end of each of the divided cylindrical portions is circumferentially sandwiched between the slit portions of the orifice member main body. Further, the other ends in the circumferential direction are arranged on both sides in the circumferential direction sandwiching the bent portion of the orifice member main body with a predetermined distance from each other. Two reinforcing bodies that are fixed or embedded in the orifice member main body and reinforce the orifice member main body in a state of being spaced apart from each other;
And the orifice member is folded at the bent portion of the orifice member main body and widened so that the intermediate sleeve can be assembled from the direction perpendicular to the axis. When the outer cylinder fitting externally fitted to the intermediate sleeve is reduced in diameter in the assembled state to the intermediate sleeve, the orifice member is disposed between the intermediate sleeve and the outer cylinder fitting. A fluid-filled cylindrical vibration isolator characterized by being held while elastically deforming an orifice member main body.   On both sides in the width direction of the outer peripheral surface of the divided cylindrical portion in the reinforcing body, vertical wall portions that are opposed to each other and extend continuously in the circumferential direction are respectively erected integrally, and the divided cylindrical portion is the orifice member. The fluid-filled cylindrical vibration damping device according to claim 1, wherein the vertical wall portion is fixed or embedded in a side wall portion of the peripheral groove while being fixed or embedded in a bottom portion of the peripheral groove of the main body.   An outer flange portion that protrudes outward in the opposing direction of the two side wall portions and extends continuously in the circumferential direction at an end portion of the vertical wall portion opposite to the divided cylindrical portion side in the reinforcing body. The fluid-filled cylindrical vibration isolator according to claim 1 or 2, wherein each is integrally formed.   The fluid-filled cylindrical vibration isolator according to claim 3, wherein an outer flange portion of the vertical wall portion of the reinforcing body is fixed or embedded in the orifice member main body.   The circumferential length of the outer flange portion of the vertical wall portion in the reinforcing body is made larger than the circumferential length of the divided cylindrical portion, and the circumferential edge of the outer flange portion is at the circumferential end of the reinforcing body. The fluid-filled cylindrical vibration isolator according to claim 3 or 4, wherein an end edge in the direction protrudes outward in the circumferential direction from an edge in the circumferential direction of the divided cylindrical portion. A shaft member and a rigid intermediate sleeve arranged around the shaft member and spaced outward in the direction perpendicular to the shaft are connected by a main rubber elastic body interposed therebetween, An integrated vulcanization molded product is prepared by opening a first pocket portion and a second pocket portion symmetrically provided in the main rubber elastic body to the outer peripheral surface through a window portion provided in the intermediate sleeve. Process,
(A) An axially extending slit provided on the outer circumferential surface of a cylindrical rubber elastic body having a circumferential groove formed with a circumferential length less than one round, and provided at one location on the circumference An orifice member body that is cut at a bent portion that is symmetrically positioned with respect to the cut portion, and (b) a circumferential length that is less than a half circumference of the orifice member body And each of the two rigid members coaxially with the orifice member main body so as to extend along a circumferential groove of the orifice member main body. While being positioned, one end in the circumferential direction of each of the divided cylindrical portions is disposed on both sides in the circumferential direction with the cut portion of the orifice member body interposed between them at a predetermined distance from each other, Furthermore, the other ends in the circumferential direction are The orifice member main body is fixed or embedded in both sides of the orifice member body at a predetermined distance on both sides in the circumferential direction with the bent portion interposed therebetween to reinforce the orifice member main body. Providing an orifice member including two reinforcing bodies;
The orifice member is folded at the bent portion of the orifice member main body, expanded, and fitted into the integral vulcanized molded product from the direction perpendicular to the axis, so that the gap between the first and second pocket portions is obtained. After being assembled so as to extend in the circumferential direction, the orifice member main body is elastically deformed by externally fitting the outer cylinder fitting to the intermediate sleeve of the integrally vulcanized molded product and reducing the diameter. Clamping the orifice member between the intermediate sleeve and the outer tube fitting;
The outer cylinder fitting is fixed to the intermediate sleeve by the reduced diameter of the outer cylinder fitting when fitted to the intermediate sleeve, and the first pocket portion and the second pocket portion are fluid-tight. By covering, the first fluid chamber and the second fluid chamber enclosing the incompressible fluid are formed symmetrically, and the peripheral groove of the orifice member is covered with the outer cylinder member. Forming an orifice passage communicating the first fluid chamber and the second fluid chamber;
A method for manufacturing a fluid-filled cylindrical vibration isolator, comprising:

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