JP2008248929A - Resin cylindrical bracket, anti-vibration mount assembly using the same and manufacturing method of resin cylindrical bracket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin cylindrical bracket having a new structure capable of effectively preventing positional shift and drop off due to upward detachment of the anti-vibration mount while avoiding problems such as increase of operation processes caused by providing a bottom metal fitting for a pneumatic actuator specified to be composed of a metal. <P>SOLUTION: The bottom metal fitting 114 in a dish-like shape for the pneumatic actuator 140 having an outer diameter smaller than an inner diameter of the cylindrical part 102 in the resin cylindrical bracket 20 is provided and connection parts 118 extending out from a plurality of positions on a circumference of the bottom metal fitting 114 toward an outer circumferential side are buried and fixed at a lower end part of the cylindrical part 102. In the part where the connecting parts 118 are fixed, an inner circumferential surface of the cylindrical part 102 is structured by an upper tapered surface 124 extending from an upper side opening part and gradually tapered toward a lower side opening part. In the part where the connecting parts are not fixed, the inner circumferential surface of the cylindrical part 102 is structured by a lower tapered surface 126 extending from the lower side opening part and gradually contracting toward the upper side opening part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a resin cylindrical bracket that is attached to an anti-vibration mount such as an engine mount and interposed between an anti-vibration mount and a vibration-proof target member such as a vehicle body, and an anti-vibration mount assembly using the same. Furthermore, it is related with the manufacturing method of resin-made cylindrical brackets.

  Conventionally, as an anti-vibration coupling body or an anti-vibration support body interposed between members constituting a vibration transmission system, for example, a first attachment member attached to one member to be anti-vibration connected is a cylindrical shape. An anti-vibration mount is known in which the first mounting member and the second mounting member are connected to each other by a main rubber elastic body so as to be spaced apart from each other on the side of one opening of the second mounting member. Further, as one type of such an anti-vibration mount, there is also known a fluid-enclosed anti-vibration mount that utilizes an anti-vibration effect based on a fluid action of a fluid enclosed inside. That is, the fluid-filled vibration-proof mount is, for example, a vibration-proof mount in which the partition member is supported on the axially intermediate portion of the second mounting member, and the wall portion is disposed on one axial side across the partition member. Part of the main body is made of rubber elastic body to form a pressure receiving chamber in which fluctuations in internal pressure occur when vibration is input, and part of the wall is made of a flexible membrane on the other side in the axial direction across the partition member It has a structure in which an equilibrium chamber that is allowed to change in volume is formed and an orifice passage that communicates the pressure receiving chamber and the equilibrium chamber is provided.

  Furthermore, in view of the problem that the vibration isolation effect based on the fluid flow action is effectively exhibited in the tuning frequency range of the orifice passage, it is difficult to effectively obtain vibration in the frequency range outside the tuning frequency range. For example, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-130126), a first orifice passage tuned to a low frequency region and a tuning to a higher frequency region than the first orifice passage. An output member as a valve means for switching the second orifice passage between a communication state and a cutoff state according to the frequency range of the input vibration, and a pneumatic actuator for opening and closing the output member An air pressure-switching type fluid-filled vibration-proof mount is also proposed.

  In addition, in the vibration proof mount having such a structure, the second mounting member is attached to a vibration proof member such as a vehicle body via a bracket for manufacturing reasons or the like. There is. That is, for example, when pre-compression is applied to the main rubber elastic body in order to improve the durability of the main rubber elastic body, a method of subjecting the second mounting member to diameter reduction processing such as an eight-way drawing It has been known. When performing such diameter reduction processing, if the attachment portion to the member to be vibration-proof connected is provided directly on the second attachment member, the diameter reduction processing is performed on the second attachment member. Is difficult to apply. Therefore, as shown in Patent Document 1, the second mounting member is press-fitted and fixed to a separately formed cylindrical bracket, and the cylindrical bracket is fixed to a member such as a vehicle body that is connected in a vibration-proof manner. Thus, a structure in which the second mounting member is assembled to the vibration isolation target member via the cylindrical bracket is employed.

  Furthermore, when such a cylindrical bracket is employed in a pneumatic switching type vibration-proof mount, a bottom bracket of a pneumatic actuator is provided on the cylindrical bracket. This bottom metal fitting is a member that constitutes a part of the wall of the working air chamber in the pneumatic actuator. For example, in Patent Document 1, the bottom metal fitting is integrated using the lower end of a metal cylindrical bracket. Is formed.

  By the way, the conventional cylindrical bracket can easily obtain high rigidity as shown in Patent Document 1 in order to prevent deformation and breakage when the vibration-proof mount body is assembled to the cylindrical bracket. It was made of possible ferrous metals. However, in recent years, for the purpose of improving the fuel consumption and weight of the vehicle, it has been studied to employ a synthetic resin material such as a fiber reinforced resin as a material for forming the cylindrical bracket.

  However, when such a resin-made cylindrical bracket is used for a switching type fluid-filled vibration-proof mount equipped with a pneumatic actuator, the metal bottom bracket is separated from the cylindrical bracket. It is necessary to form the body and fix it to the cylindrical bracket by using a rivet or the like. Therefore, if the plastic cylindrical bracket is applied to the pneumatic switching type anti-vibration mount, the bottom bracket is separated from the cylindrical bracket, the number of parts increases, and the bottom bracket is attached to the cylindrical bracket. It was easy to become a problem that the attachment process was specially required.

  Further, as a means for solving the above-described problems, it is conceivable to adopt a bottom member formed of a synthetic resin material in place of the bottom metal member formed of metal and integrally mold it with the cylindrical bracket. Thus, when the bottom member which closes one opening part of a cylindrical bracket is integrally molded, the shape of the internal peripheral surface of a cylindrical bracket is set by the upper side metal mold | die removed by the axial direction upper direction. Here, in the molding of the synthetic resin, in order to facilitate the removal of the mold from the molded product, the surface on the cavity side of the mold is a tapered surface that gradually increases in diameter toward the demolding direction, The molded product is attached with a die taper. Therefore, when the cylindrical bracket and the bottom member are integrally formed, the inner peripheral surface of the cylindrical bracket is constituted by an upper tapered surface that gradually expands in the axial direction upward. However, when the entire inner peripheral surface of the cylindrical bracket is configured by the upper tapered surface that gradually increases in diameter toward the upper side, the anti-vibration mount that is inserted from the upper side in the axial direction is easily detached from the cylindrical bracket. There was a problem.

  Furthermore, when each member is assembled to the bottom member formed of the synthetic resin material to constitute the pneumatic actuator, the bottom member constituting a part of the wall portion of the working air chamber to which the air pressure is applied from the outside, and other members A gap is easily formed between the members constituting a part. Therefore, there is a problem in that it is difficult to achieve stable operation of the actuator due to imperfect sealing from the outside of the working air chamber, as compared to assembly by press fitting when a metal bottom metal fitting is used. .

JP 2003-130126 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to increase the number of work steps by providing a bottom fitting for a pneumatic actuator made of metal. It is an object of the present invention to provide a resin-made cylindrical bracket having a novel structure that can effectively prevent positional displacement and dropout due to upward pulling of the vibration-proof mount while avoiding such problems.

  Another object of the present invention is to provide a pneumatic switching type anti-vibration mount that includes a resin-made cylindrical bracket and can advantageously realize switching of the anti-vibration characteristics by stable operation of the pneumatic actuator. To do.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, the present invention relates to a resin-made cylindrical bracket provided with a cylindrical portion that is externally fitted and fixed to a vibration-proof mount, and the cylindrical portion has a dish-like shape at the opening portion on the lower side in the axial direction. A bottom bracket for a pneumatic actuator having an outer diameter smaller than the inner diameter of the shaped portion is disposed, and connecting portions that protrude toward the outer peripheral side are integrally formed at a plurality of locations on the circumference of the bottom bracket. The connecting portion is embedded and fixed to the lower end portion of the cylindrical portion, and is supported at an upper portion in the axial direction of the cylindrical portion at a portion where the connecting portion is fixed on the periphery of the cylindrical portion. An upper taper surface extending from the opening of the cylindrical portion and gradually reducing in diameter toward the axially lower opening is provided on the inner peripheral surface of the cylindrical portion, and the connecting portion is provided on the periphery of the cylindrical portion. In the part off the axis, it extends from the opening on the lower side in the axial direction of the cylindrical part and faces the opening on the upper side in the axial direction. Lower tapered surface gradually reduced in diameter Te is characterized in that provided on the inner peripheral surface of the cylindrical portion.

  In such a resin-made cylindrical bracket having a structure according to the present invention, the connecting portion is formed integrally with the bottom bracket for the pneumatic actuator, and the connecting portion is embedded and fixed in the cylindrical portion of the resin-made cylindrical bracket. Thus, the metal bottom metal fitting can be integrally provided at a predetermined position of the cylindrical portion. Therefore, without requiring a special process of assembling the metal bottom bracket to the resin bracket, the weight of the cylindrical portion is made of synthetic resin, and the air pressure by making the bottom bracket metal. Effects such as realization of stable operation of the actuator can be advantageously obtained.

  In addition, by providing upper and lower taper surfaces on the inner peripheral surface of the cylindrical part, it is possible to achieve both ease of fitting when it is externally fixed to the anti-vibration mount and difficulty in removing the anti-vibration mount. It becomes possible to do.

  The bottom metal fitting supported by the cylindrical portion of the resin cylindrical bracket is a base housing that constitutes a pneumatic actuator, and as a whole has a dish shape, but the specific shape is limitedly interpreted. For example, a material having a substantially annular shape with a through hole formed in the center portion of the bottom wall portion can also be adopted as the bottom metal fitting of the present invention.

  Further, in the resin-made cylindrical bracket according to the present invention, the mounting leg attached to the vibration-proof target member is integrally formed with the cylindrical part, and the mounting leg is formed from the lower end in the axial direction of the cylindrical part. A structure in which the connecting portion integrally formed with the bottom metal fitting extends to the outer peripheral side from the cylindrical portion and is embedded and fixed to the mounting leg portion is preferable. Adopted.

  By adopting such a structure, the connecting portion is fixed over a wide range extending not only to the cylindrical portion but also to the mounting leg portion, so that the cylindrical portion and the mounting formed integrally with the synthetic resin material can be used. The fixing strength of the bottom bracket to the leg can be improved, and a stable mounting state of the bottom bracket can be realized.

  Further, in the resin-made cylindrical bracket according to the present invention, the inner peripheral surface of the cylindrical portion is an axially intermediate portion of the cylindrical portion at a portion where the connecting portion is removed on the periphery of the cylindrical portion. The upper taper surface formed in the region from the axially upper opening to the axially upper opening and the lower taper surface formed in the region from the axially intermediate portion of the cylindrical portion to the axially lower opening It is desirable that a locking top portion extending in the circumferential direction and projecting to the inner peripheral side is formed at the boundary between the upper and lower tapered surfaces and is locked to the vibration-proof mount.

  By providing such a locking top and abutting and locking the vibration-proof mount to the bracket while the vibration-proof mount is attached to the bracket, it is possible to more advantageously prevent the vibration-proof mount from being detached from the bracket.

  Furthermore, the present invention provides an anti-vibration mount assembly in which the anti-vibration mount is fitted to the resin-made cylindrical bracket according to any one of claims 1 to 3, wherein the anti-vibration mount is provided. However, an output member that is spaced apart above the bottom metal fitting is provided to fix the inner peripheral edge of the annular plate-shaped elastic partition wall to the output member, and the outer peripheral edge of the elastic partition wall is annular The pneumatic actuator having a working air chamber sealed from the outside between the output member and the bottom metal fitting is configured by fixing the fitting metal fitting and press-fitting the fitting metal fitting to the bottom metal fitting. In addition, the vibration isolating mount assembly has a structure in which the vibration isolating characteristics can be switched by driving and displacing the output member with the air pressure exerted on the working air chamber.

  In the vibration-proof mount assembly having the structure according to the present invention as described above, the elastic partition wall constituting the wall portion of the working air chamber is press-fitted and fixed to the bottom metal fitting so that the elastic partition wall is attached at a predetermined position. The target assembly state can be stably maintained. Therefore, it is possible to effectively ensure the airtightness of the working air chamber and advantageously realize the operation of the intended pneumatic actuator.

  In the vibration isolating mount assembly according to the present invention, the first mounting member to which the anti-vibration mount is attached to one of the anti-vibration target members is fitted to the resin-made cylindrical bracket to be the anti-vibration target. One of the first mounting member and the second mounting member are connected to each other by the main rubber elastic body by being spaced apart from the upper opening of the cylindrical second mounting member attached to the other of the members, The partition member is supported by the second mounting member, and on one side sandwiching the partition member, a part of the wall portion is constituted by the main rubber elastic body, and pressure is received when vibration is input. A chamber is formed, and on the other side of the partition member, a part of the wall portion is made of a flexible film, and an equilibrium chamber is formed in which volume change is allowed. The chamber is filled with incompressible fluid and further A first orifice passage communicating with the chamber and the equilibrium chamber and a second orifice passage tuned in a higher frequency range than the first orifice passage, and the output member of the pneumatic actuator is driven and displaced It is also possible to adopt a structure in which the anti-vibration characteristics can be switched by switching the second orifice passage between the communication state and the cutoff state by being tightened.

  Adopting the anti-vibration mount of such structure, the stable operation is realized by adopting the metal bottom bracket for the communication state and cutoff state of the second orifice passage tuned to a higher frequency range. By switching with a pneumatic actuator, an excellent vibration isolation effect based on the fluid flow action can be effectively obtained for both low-frequency and high-frequency vibrations.

  Further, in the vibration isolating mount assembly according to the present invention, a fitting rubber is formed on the outer peripheral surface of the second mounting member in the vibration isolating mount, and the fitting rubber is formed of the resin cylindrical shape. It is desirable that the anti-vibration mount exerts a resistance against the resin cylindrical bracket by abutting and locking to the lower tapered surface of the bracket.

  If such a structure is adopted, the dragging rubber is pressed against the lower taper surface and is brought into contact with and locked, so that a drag force against the vibration-proofing mount from the bracket can be advantageously obtained. . Therefore, it is possible to stably realize a target assembled state of the vibration-proof mount and the bracket, and to avoid problems such as the vibration-proof mount being detached from the bracket and coming off.

  The present invention also includes a step of preparing in advance an upper mold and a lower mold for setting the inner peripheral surface shape of the cylindrical portion, and a molding mold including the upper mold and the lower mold. A molding cavity is formed, and the bottom metal fitting is sandwiched between the upper mold and the lower mold, and the connecting portion formed integrally with the bottom metal fitting is positioned so as to extend into the molding cavity. A step of filling the molding cavity with a synthetic resin material, molding the resin cylindrical bracket with the bottom metal part inserted therein, and removing the molding die from the molded resin cylindrical bracket When manufacturing the resin cylindrical bracket according to any one of claims 1 to 3 by a process, the upper mold is removed upward from the resin cylindrical bracket, Using the taper surface for demolding the upper mold The upper tapered surface formed on the inner peripheral surface of the cylindrical portion is formed so as to extend from the upper opening edge of the cylindrical portion, and the lower mold is removed downward from the resin cylindrical bracket. The lower taper surface is formed so as to extend from the lower opening edge of the cylindrical portion using the taper surface for demolding of the lower mold, and on the circumference of the cylindrical portion By extending the lower mold upward from the bottom metal part at the part where the connection part is removed, the lower taper surface is formed to extend above the bottom metal part at the part from which the connection part is removed. The method of manufacturing the resin cylindrical bracket is also characterized.

  According to such a method of manufacturing a resin cylindrical bracket according to the present invention, the inner peripheral surface shape of the resin cylindrical bracket is set by the upper and lower molds that are removed vertically in the axial direction. The upper and lower taper surfaces formed on the inner peripheral surface of the cylindrical portion of the resin-made cylindrical bracket are the taper for removing the upper and lower molds (the molding die forming the wall of the molding cavity is made of synthetic resin) In order to be easily removed from the molded product after filling, it is formed by using a slant that is gradually increased in diameter toward the demolding direction. Therefore, by providing the upper and lower taper surfaces, it is excellent in guiding action when assembling the vibration-proof mount to the cylindrical bracket and securing the pull-out resistance when the vibration-proof mount is attached to the cylindrical bracket. These effects can be realized with a small number of processes and parts without requiring special processes and parts for forming the upper and lower tapered surfaces.

  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 shows an anti-vibration mount assembly 10 as an embodiment of the present invention. This anti-vibration mount assembly 10 includes an anti-vibration mount in which a first attachment fitting 14 as a first attachment member and a second attachment fitting 16 as a second attachment member are elastically connected by a main rubber elastic body 18. The first mounting bracket 14 is attached to the power unit (not shown) while the second mounting bracket 16 is a cylinder. The power unit is vibration-proof supported by the vehicle body by being fitted into the shape bracket 20 and attached to the vehicle body side (not shown) via the cylindrical bracket 20. In the following description, the vertical direction means the vertical direction in FIG. 1 which is the main vibration input direction in principle.

  More specifically, the first mounting bracket 14 is a highly rigid member formed of a metal material such as iron or aluminum alloy, and has a substantially inverted truncated cone block shape. A mounting bolt 22 is integrally formed on the large-diameter side end face of the first mounting bracket 14 so as to protrude upward in the axial direction.

  On the other hand, the second mounting bracket 16 has a substantially cylindrical shape with a large diameter as a whole. In addition, the second mounting bracket 16 includes a constricted portion 24 as an annular concave groove at the upper end in the axial direction. The constricted portion 24 is recessed inward in the radial direction and extends in the circumferential direction. In the present embodiment, the constricted portion 24 has a substantially constant cross-sectional shape over the entire circumference of the second mounting bracket 16. In particular, the upper opening portion of the second mounting bracket 16 constituting the upper portion of the constricted portion 24 is a tapered portion 26 that gradually expands toward the opening side. Thereby, the depth of the groove-shaped part formed so as to open to the outer peripheral side using the shape of the constricted portion 24 gradually becomes shallower as it goes to the opening side of the second mounting bracket 16.

  A flange-like portion 28 that extends outward in the radial direction is integrally formed at the opening-side end edge portion of the constricted portion 24 that is the opening edge portion on the upper side in the axial direction of the second mounting bracket 16. Further, a pair of fixing pieces 30, 30 projecting to the outer peripheral side are integrally formed on the flange-shaped portion 28 so as to face each other in one radial direction, and bolts are inserted into the fixing pieces 30, 30. Holes 32 are provided. The flange-shaped portion 28 is integrally formed with one contact piece 34 that protrudes to the outer peripheral side at one location on the circumference. Then, a shock absorber 36 is attached and formed on the outer surface in the axial direction of the contact piece 34, thereby forming a bound stopper that allows a power unit side mounting bracket (not shown) to contact.

  Furthermore, an inclined portion 38 that gradually decreases in diameter as it goes downward in the axial direction is formed at the axially intermediate portion of the second mounting bracket 16, and a large diameter portion 40 is formed between the inclined portion 38 and the constricted portion 24. On the other hand, the axially lower side of the inclined portion 38 is a small diameter portion 42. Moreover, the opening edge part by the side of the small diameter part 42 is made into the crimping part bent in the radial direction inner side.

  In the second mounting bracket 16 having such a structure, the first mounting bracket 14 is disposed on substantially the same central axis so as to be spaced apart from the opening portion on the upper side in the axial direction. A main rubber elastic body 18 is disposed between the first mounting bracket 14 and the second mounting bracket 16, and the first mounting bracket 14 and the second mounting bracket are arranged by the main rubber elastic body 18. 16 is elastically connected.

  The main rubber elastic body 18 has a truncated cone shape as a whole, and is vulcanized and bonded to the main rubber elastic body 18 so that the first mounting bracket 14 is inserted from the end surface on the small diameter side. Further, the opening portion on the upper side in the axial direction of the second mounting bracket 16 is overlapped and vulcanized and bonded to the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 18. In particular, in the present embodiment, the entire constricted portion 24 is fixed to the outer peripheral surface of the main rubber elastic body 18. In the present embodiment, the main rubber elastic body 18 is an integrally vulcanized molded product including the first mounting bracket 14 and the second mounting bracket 16.

  Further, the opening of the second mounting bracket 16 is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body 18 in this way, so that the opening on the upper side in the axial direction of the second mounting metal 16 is the main rubber elastic body. 18 is closed fluid-tightly. A mortar-shaped large-diameter recess 44 is formed on the large-diameter side end surface of the main rubber elastic body 18 and is opened in the second mounting bracket 16.

  Furthermore, a seal rubber layer 46 is formed on the inner peripheral surface of the second mounting bracket 16. The seal rubber layer 46 is integrally formed with the main rubber elastic body 18, and the inner peripheral surfaces of the large diameter portion 40 and the inclined portion 38 are covered by the seal rubber layer 46 over substantially the entire surface. The seal rubber layer 46 is thinner than the lower end portion of the main rubber elastic body 18, and the seal rubber layer 46 extends downward from the outer peripheral edge of the lower end portion of the main rubber elastic body 18. A stepped surface 48 extending in the direction perpendicular to the axis is formed at the opening peripheral edge of the large-diameter recess 44 in the main rubber elastic body 18.

  A fitting rubber 50 as a fitting rubber is attached to the outer peripheral surface of the second mounting bracket 16. The fitting rubber 50 is formed of a rubber elastic body having a large-diameter substantially cylindrical shape, and covers the outer peripheral surface of the second mounting bracket 16 from the upper end in the axial direction to the lower end of the large-diameter portion 40. It is formed so as to adhere. In other words, the fitting rubber 50 is formed so as to cover from the axially intermediate portion of the second mounting bracket 16 to the upper end edge in the axial direction. The fitting rubber 50 has a lower portion that is a press-contact portion 52 fixed to the outer peripheral surface of the large-diameter portion 40 of the second mounting bracket 16, and an upper portion that is on the outer peripheral side of the constricted portion 24. A thick fixing portion 54 filled in the formed concave portion is formed. In this embodiment, the fitting rubber 50 is integrally formed with the main rubber elastic body 18 through a through hole (not shown) penetrating through the flange-like portion 28, the constricted portion 24, etc. of the second mounting bracket 16. Has been.

  Further, in this embodiment, the press contact portion 52 which is a portion fixed to the large diameter portion 40 in the fitting rubber 50 protrudes to the outer peripheral side as compared with the fixed portion 54 which is a portion fixed to the constricted portion 24. It has a large diameter, and an annular annular step surface 56 is provided at the boundary between the pressure contact portion 52 and the fixing portion 54. Thereby, the outer peripheral surface of the fitting rubber 50 is made into the substantially cylindrical shape with a step.

  In the present embodiment, the annular step surface 56 is located slightly above the lower end portion of the constricted portion 24 that extends from the upper end portion of the large diameter portion 40 toward the inner peripheral side in the second mounting bracket 16. It is formed as follows. Further, in the present embodiment, the annular step surface 56 is an annular inclined surface that is gradually inclined downward in the axial direction as going to the outer peripheral side. Further, although not necessarily clear in the figure, the press contact portion 52 of the fitting rubber 50 in the present embodiment is formed with a plurality of groove-shaped portions that open to the outer peripheral surface and extend linearly in the axial direction. The outer peripheral surface of the press-contact portion 52 has an uneven shape in the circumferential direction. Further, on the outer peripheral surface of the fitting rubber 50, an annular seal lip having a small protrusion shape and extending in the circumferential direction may be integrally formed.

  Further, the outer diameter size of the pressure contact portion 52 in the fitting rubber 50 is set larger than the minimum inner diameter size of the cylindrical portion 102 in the cylindrical bracket 20 described later. In the present embodiment, the outer diameter dimension of the fixing portion 54 in the fitting rubber 50 is substantially the same as or slightly larger than the outer diameter dimension of the large diameter portion 40 in the second mounting bracket 16. The inner diameter dimension of the upper opening portion of the cylindrical portion 102 in the bracket 20 is made slightly smaller.

  Further, a partition member 58 and a diaphragm 60 as a flexible film are sequentially inserted into the second mounting bracket 16 from an opening portion below the axial direction, and are fitted and fixed to the second mounting bracket 16. ing. Each of the partition members 58 has a structure in which upper and lower partition plates 62 and 64 having a substantially disk shape formed of a hard material such as a metal material or a synthetic resin material are overlapped with each other in the axial direction. The diaphragm 60 is formed of a thin rubber film, has a substantially thin disk shape with ripples of slackness, and a cylindrical support fitting 66 is vulcanized and bonded to the outer peripheral edge thereof. ing.

  Then, the partition member 58 and the diaphragm 60 are sequentially inserted into the second mounting bracket 16 in the axial direction, and thereafter, the second mounting bracket 16 is subjected to diameter reduction processing such as eight-way drawing. The outer peripheral surfaces of the partition member 58 and the support metal fitting 66 are fitted and fixed to the second attachment metal fitting 16. The lower end opening of the second mounting bracket 16 is caulked and locked to the lower end of the support bracket 66. Further, under such an assembled state, the partition member 58 and the support fitting 66 are overlapped with each other in the axial direction, and between the stepped surface 48 of the main rubber elastic body 18 and the lower end caulked portion of the second attachment fitting 16. , Is positioned in the axial direction. Furthermore, the seal rubber layer 46 is sandwiched between the partition member 58 and the second mounting bracket 16, and the diaphragm 60 is integrally formed between the support bracket 66 and the second mounting bracket 16. Thus, the seal rubber 68 attached to the outer peripheral surface of the support metal fitting 66 is clamped.

  Thus, a pressure receiving chamber 70 in which a part of the wall portion is formed of the main rubber elastic body 18 is formed on the upper side in the axial direction of the partition member 58, while the wall is formed on the lower side in the axial direction of the partition member 58. An equilibrium chamber 72 is formed, part of which is made of a diaphragm 60. The pressure receiving chamber 70 and the equilibrium chamber 72 are fluid-tightly partitioned with respect to the external space, and are filled with incompressible fluid such as water, alkylene glycol, polyalkylene glycol, and silicone oil, respectively. The fluid is sealed in the pressure receiving chamber 70 and the equilibrium chamber 72 by drawing the partition member 58 and the diaphragm 60 into the second mounting bracket 16 in the incompressible fluid and drawing the second mounting bracket 16. It can be advantageously made by applying.

  The pressure receiving chamber 70 is adapted to cause a pressure change based on elastic deformation of the main rubber elastic body 18 when vibration is input between the first mounting bracket 14 and the second mounting bracket 16. On the other hand, the balance chamber 72 is allowed to change its volume by allowing the diaphragm 60 to be easily deformed.

  Further, the upper partition plate 62 constituting the partition member 58 is formed with a circumferential groove 74 having an outer peripheral edge extending in a substantially constant cross-sectional shape and having a predetermined length in the circumferential direction that opens to the outer peripheral surface. On the other hand, in the lower partition plate 64, an outer peripheral groove 76 extending in the outer peripheral edge portion with a substantially constant cross-sectional shape is formed on the outer peripheral surface and the upper surface in the axial direction so as to have a predetermined length in the circumferential direction. An inner peripheral groove 78 extending in the middle portion in the direction with a substantially constant cross-sectional shape is formed on the upper surface in the axial direction and has a predetermined length in the circumferential direction. Further, a circular recess 80 that opens downward is formed in the central portion of the lower partition plate 64.

  The upper and lower partition plates 62 and 64 are overlapped in the axial direction, and the second mounting bracket 16 is fitted and fixed to each outer peripheral surface, so that the circumferential groove 74 and the outer circumferential groove 76 are covered. The partition member 58 is formed with upper and lower two-stage outer flow paths 82 and 84 each extending in the circumferential direction by a predetermined length in the outer peripheral edge portion. The outer flow paths 82 and 84 are connected in series at a connection hole 86 formed in the upper partition plate 62 at one end, and the other end is connected to the upper and lower partition plates 62 and 64. The pressure-receiving chamber 70 and the equilibrium chamber 72 are communicated with each other through the formed communication holes 88 and 90. As a result, a first orifice passage 92 is formed in the outer peripheral portion of the partition member 58 so as to extend in the circumferential direction by a length of one or more rounds and permit fluid flow between the pressure receiving chamber 70 and the equilibrium chamber 72. Yes.

  Further, the inner peripheral groove 78 of the lower partition plate 64 is covered with the upper partition plate 62, and therefore, an inner flow path 94 extending in the radial intermediate portion with a predetermined length is formed inside the partition member 58. Has been. One end portion of the inner flow path 94 is opened and communicated with the pressure receiving chamber 70 through a communication hole 96 formed in the upper partition plate 62, and the other end portion is connected to the lower partition plate 64. Through the communication hole 98 formed in the above, the recess 80 opens to the equilibrium chamber 72 and communicates therewith. As a result, a second orifice passage 100 is formed in the intermediate portion in the radial direction of the partition member 58 that extends in the circumferential direction by a length of one round or less and allows fluid flow between the pressure receiving chamber 70 and the equilibrium chamber 72. Has been.

  In the present embodiment, the first orifice passage 92 is tuned to a low frequency range of about 10 Hz so as to exhibit an effective vibration-proofing effect against engine shake, while the second orifice passage 100. Is tuned to a high frequency range of about 20 to 40 Hz so as to exhibit an effective anti-vibration effect against idling vibration.

  The mount body 12 having such a structure is fixedly assembled to the cylindrical bracket 20 as shown in FIG. The cylindrical bracket 20 is formed of a hard synthetic resin material such as fiber reinforced resin. As shown in FIG. 2, the cylindrical bracket 20 has a substantially cylindrical shape and has a cylindrical portion 102 into which the mount body 12 is fitted. I have. An attachment leg 104 extending to the outer peripheral side is integrally formed at the lower end edge of the cylindrical portion 102. In the present embodiment, the mounting leg portion 104 has a plate shape that is opposed to each other in one radial direction and extends toward both sides. A fixing nut 106 is fixed to each of the mounting legs 104, and a central hole of the fixing nut 106 passes through the mounting legs 104 in the axial direction (plate thickness direction).

  A pair of fixed support pieces 108 and 108 are integrally formed at the upper edge of the cylindrical portion 102. The fixed support piece 108 is formed in a plate shape that protrudes in the opposing direction of the pair of mounting legs 104 and 104 and extends in the direction perpendicular to the axis, and is opposed to the radial direction in one direction and the pair of fixed support pieces 108. , 108 are formed. Further, fixing bolts 110 are respectively implanted in the fixing support pieces 108 and protrude upward in the axial direction. In addition, an abutting support piece 112 protruding in a direction substantially orthogonal to the opposing direction of the pair of fixed support pieces 108 and 108 is integrally formed at the upper edge of the cylindrical portion 102. Further, reinforcing ribs for reinforcing the fixed support pieces 108 and 108 and the contact support piece 112 are integrally formed on the outer peripheral surface of the cylindrical bracket 20.

  Further, a base fitting 114 as a bottom fitting for a pneumatic actuator is disposed at the lower end opening of the tubular portion 102 of the tubular bracket 20. The base metal fitting 114 has a shallow, substantially dish shape, and is a highly rigid member formed of a metal material such as iron. Furthermore, the base metal fitting 114 is formed with an outer diameter smaller than the inner diameter of the cylindrical portion 102 of the cylindrical bracket 20. Further, the base metal fitting 114 of this embodiment is provided with a central hole 116 that penetrates the bottom wall portion. As shown in FIG. 3, the central hole 116 has an oval shape and is formed in the central portion of the bottom wall of the base metal fitting 114.

  Further, a pair of connection support portions 118, 118 as a connection portion are integrally formed at the opening peripheral edge portion of the base metal fitting 114. As shown in FIG. 3, the connection support portion 118 has a substantially rectangular flat plate shape extending in the direction perpendicular to the axis, and is opposed to the upper end opening of the base metal fitting 114 in one radial direction and is positioned on the outer peripheral side. A pair is provided so as to protrude. In addition, a through hole 120 penetrating in the thickness direction (up and down in FIG. 2) is formed in the central portion of the connection support portion 118.

  And a pair of connection support part 118,118 is embedded and fixed to the lower end part of the cylindrical part 102 in the cylindrical bracket 20, and the attachment leg part 104 extended to radial direction outward from there. The metal fitting 114 is disposed on and fixed to the cylindrical bracket 20 on substantially the same central axis. As a result, as shown in FIG. 3, the lower opening of the cylindrical portion 102 is closed at the portion where the connection support portions 118, 118 are fixed on the periphery of the cylindrical portion 102. On the other hand, on the periphery of the cylindrical portion 102, the central portion of the lower opening of the cylindrical portion 102 is covered with the base metal fitting 114 at the portion where the connection support portions 118, 118 are removed, and the cylindrical portion 102. A gap 122 is formed between the base metal 114 and the base metal 114 in the radial direction, and an area above the base metal 114 on the inner peripheral side of the cylindrical portion 102 is an area below the base metal 114 through the gap 122 (external ).

  The gap 122 has a radial size d: 3 mm ≦ d ≦ 15 mm, and more preferably 5 mm ≦ d ≦ 10 mm. In other words, in the portion where the connection support portions 118, 118 are removed on the circumference, the radial separation distance d between the inner peripheral surface of the cylindrical portion 102 and the outer peripheral surface of the base metal piece 114 is 3 mm ≦ d ≦ 15 mm. More preferably, it is desirable that 5 mm ≦ d ≦ 10 mm. In particular, in the present embodiment, the radial dimension d of the gap 122 is d = 6 mm.

  In the present embodiment, the inner peripheral surface of the cylindrical portion 102 of the cylindrical bracket 20 is configured as a tapered surface. More specifically, the portion where the connection support portions 118 and 118 are fixed on the circumference of the tubular portion 102 is formed in a region extending from the upper end opening edge of the tubular portion 102 to the upper surface of the connection support portions 118 and 118. Thus, the inner peripheral surface of the cylindrical portion 102 is constituted by the upper tapered surface 124 that gradually decreases in diameter as it goes downward in the axial direction. On the other hand, in the part where the connection support parts 118, 118 are removed on the circumference of the cylindrical part 102, it is formed from the upper end opening edge of the cylindrical part 102 to the axially intermediate part, and gradually goes downward in the axial direction. The cylindrical portion 102 is formed by the upper tapered surface 124 that is reduced in diameter and the lower tapered surface 126 that is formed from the axially intermediate portion of the cylindrical portion 102 to the lower end opening edge and gradually reduces in diameter in the axial direction. The inner peripheral surface of is constructed.

  The inclination angles of the upper and lower tapered surfaces 124 and 126 are not particularly limited, but are desirably 0.5 degrees or more and 5 degrees or less. In particular, in this embodiment, the inclination angles of the upper and lower tapered surfaces 124 and 126 are set to 1 to 2 degrees. When the inclination angle of the tapered surfaces 124 and 126 is too small, it is difficult to obtain a sufficient locking effect with the mount body 12 described later. On the other hand, when the inclination angle is too large, the outer diameter of the cylindrical bracket 20 is reduced. This is because the size of the anti-vibration mount assembly 10 is increased.

  Further, at the portion of the circumference of the cylindrical portion 102 where the connection support portions 118, 118 are removed, as shown in FIG. 2, a ridge line shape extending in the circumferential direction at the boundary between the upper taper surface 124 and the lower taper surface 126. A locking top portion 128 is formed. The locking top portion 128 is formed so as to protrude toward the inner peripheral side. In this embodiment, the locking top portion 128 has a substantially bowl-shaped cross-sectional shape that gradually becomes narrower in the axial direction toward the protruding tip side. ing. Further, in the present embodiment, the locking top portion 128 extends in the circumferential direction with a length of a little less than a half circumference, and a pair of the locking top portions 128 are opposed to each other in one radial direction orthogonal to the protruding direction of the connection support portions 118 and 118. Is formed.

  Here, in the present embodiment, the upper taper surface 124 and the lower taper surface 126 are formed by using the taper for demolding the molding die for the cylindrical bracket 20. That is, as shown in FIG. 4, the cylindrical bracket 20 in the present embodiment includes four horizontal molds 134 and 134 that are divided in the circumferential direction from an upper mold 130 and a lower mold 132 that are prepared in advance. , 134, 134 is formed by filling a synthetic resin material into a molding cavity 135 having a wall portion, and the upper taper surface 124 uses a taper for demolding the upper mold 130. The lower taper surface 126 is formed by utilizing the taper for demolding the lower mold 132.

  More specifically, as shown in FIG. 4, the inner peripheral surface shape of the cylindrical bracket 20 is set by the upper and lower molds 130 and 132 constituting the wall portion of the molding cavity 135, and four horizontal The outer peripheral surface shape of the cylindrical bracket 20 is set by the mold 134.

  That is, a central convex portion 136 is formed at the central portion of the upper mold 130 and has a substantially cylindrical shape and protrudes downward in the axial direction. The central convex portion 136 has a shape in which outer peripheral surfaces thereof are opposed to each other in one radial direction and flat surfaces parallel to each other are connected by an arcuate curved surface, and has a substantially constant oval cross section in the axial direction. It extends to. A part of the inner peripheral surface shape of the cylindrical bracket 20 is set by the arcuate curved surface constituting the outer peripheral surface of the central convex portion 136.

  On the other hand, the lower mold 132 is provided with a pair of flange wall portions 138 and 138 projecting upward. The flange wall 138 has a cross-sectional shape surrounded by a subarc and a chord, and is formed so as to extend substantially in the axial direction. In the present embodiment, the pair of ribs 138, 138 are provided so that the flat surfaces (string side in the cross-sectional shape) constituting a part of the outer peripheral surface are opposed to each other, and facing upward. Protruding. And the other part of the inner peripheral surface shape of the cylindrical bracket 20 is set by the arcuate curved surfaces constituting the outer peripheral surfaces of the flange wall portions 138 and 138.

  On the other hand, the outer peripheral side wall surface of the molding cavity 135 is configured by the inner peripheral surface of the horizontal mold 134 so that the outer peripheral surface shape of the cylindrical bracket 20 is set by the inner peripheral surfaces of the four horizontal molds 134. It has become.

  A base metal fitting 114 is disposed between the central convex portion 136 of the upper mold 130 and the central portion of the lower mold 132, and the base metal fitting 114 is sandwiched between the upper and lower molds 130 and 132, and The connection support portions 118, 118 integrally formed on the opening edge portion of the base metal fitting 114 extend into the molding cavity 135 of the cylindrical bracket 20 and are positioned. In particular, the connection support portions 118, 118 in this embodiment are provided so as to extend to the lower end portion of the molding cavity 135, and the protruding tip portion of the mounting leg portion 104 is integrally formed with the lower end of the cylindrical bracket 20. It is provided with a length that extends into the cavity. Further, the fixing bolt 110 is set at a predetermined position between the upper mold 130 and the four horizontal molds 134, and the fixing nut 106 is set at a predetermined position between the lower mold 132 and the four horizontal molds 134. Is done.

  Further, since the outer diameter of the base metal fitting 114 is made smaller than the inner diameter of the cylindrical bracket 20, the cylindrical bracket 20 is formed at a portion on the circumference where the connection support portions 118, 118 of the base metal fitting 114 are removed. The wall surface on the inner peripheral side of the cavity 135 is positioned farther to the outer peripheral side than the outer peripheral edge portion of the base metal fitting 114. Further, at the portion where the connection support portions 118, 118 are removed, the central convex portion 136 provided on the upper mold 130 is positioned farther to the inner peripheral side than the inner peripheral side wall surface position of the molding cavity 135. Then, in the part where the connection support portions 118, 118 on the circumference are removed, the pair of ribs 138, 138 provided in the lower mold 132 sandwich the central convex portion 136 in the facing direction of the pair of facing planes. The base metal fittings 114 (connection support portions 118, 118) are extended to the upper side. And in the part which remove | deviated the connection support part 118,118 on the periphery, the inner peripheral side wall surface of the shaping | molding cavity 135 comes to be comprised by the circular-arc-shaped curved surface which comprises the outer peripheral surface of the collar wall part 138,138. Yes. In the present embodiment, the pair of ribs 138 and 138 has a protruding height smaller than the axial height of the cylindrical bracket 20.

  As a result, the shape of the inner peripheral surface of the cylindrical bracket 20 at the portion where the connection support portions 118, 118 are removed on the circumference is from the lower end portion in the axial direction to the intermediate portion in the axial direction. , 138 and the central convex portion 136 of the upper mold 130 from the axially intermediate portion to the axially upper end portion.

  The base metal fitting 114, the fixing bolt 110, and the fixing nut 106 are set at predetermined positions on the molds 130, 132, and 134, and the molding resin 135 is filled with the synthetic resin material, whereby the base metal fitting 114 is filled. In addition, a resin-made cylindrical bracket 20 in which a fixing bolt 110 and a fixing nut 106 are integrally inserted is formed. In particular, in this embodiment, the synthetic resin material is filled in the through hole 120 formed in the connection support portion 118, so that the base metal member 114 can be advantageously fixed to the cylindrical portion 102. .

  Furthermore, after the cylindrical bracket 20 is molded, the upper mold 130, the lower mold 132, and the horizontal mold 134 are removed from the cylindrical bracket 20 as a molded product.

  Here, in the upper and lower molds 130 and 132 for setting the inner peripheral surface shape of the cylindrical bracket 20, the portion for setting the inner peripheral surface shape of the cylindrical bracket 20 gradually expands in the direction of removing the mold. It is composed of a tapered surface that has a diameter. That is, the upper mold 130 is removed from the cylindrical bracket 20 in the axial direction, and the outer peripheral surface (arc-shaped curved surface portion) of the central convex portion 136 that sets the inner peripheral surface shape of the cylindrical bracket 20 is set. ) Is a tapered surface that gradually inclines toward the outer peripheral side as it goes upward in the axial direction, which is the base end side of the central convex portion 136. On the other hand, the lower mold 132 is removed from the cylindrical bracket 20 in the axial direction, and the outer peripheral surfaces (arc-shaped curves) of the flange wall portions 138 and 138 that set the inner peripheral surface shape of the cylindrical bracket 20 are set. The surface portion is a tapered surface that gradually inclines toward the outer peripheral side as it goes downward in the axial direction, which is the base end side of the flange wall portions 138 and 138.

  Since such a tapered surface is set on each outer peripheral surface of the central convex portion 136 and the rib wall portions 138 and 138, the upper die 130 is removed from the upper die 130 by the guide action of the tapered surface, and the lower die The mold 132 can be easily removed downward, and the upper and lower tapered surfaces 124 and 126 can be easily formed on the inner peripheral surface of the cylindrical bracket 20 by using these removal taper surfaces. . In the present embodiment, in the portion where the pair of connection support portions 118, 118 are removed on the circumference, the flange wall portions 138, 138 of the lower mold 132 extend upward from the base metal fitting 114, and the lower taper surface 126 is formed so as to extend from the lower opening of the cylindrical portion 102 to the upper side of the base metal fitting 114.

  The mount body 12 is assembled to the cylindrical bracket 20 formed in this way. The mount main body 12 is fitted from the upper opening of the tubular portion 102 in the tubular bracket 20, and the second mounting bracket 16 extends substantially entirely except for the flange-shaped portion 28. It is incorporated in a state of being accommodated in the shape portion 102. Under the assembled state, the flange-shaped portion 28 of the second mounting bracket 16 is overlapped with the upper end surface in the axial direction of the cylindrical bracket 20.

  In addition, the cylindrical part 102 of the cylindrical bracket 20 is made into the thickness dimension with which the flange-shaped part 28 of the 2nd attachment bracket 16 can be piled up with sufficient area with respect to the upper end surface. In addition, a pair of fixed pieces 30 protruding from the second mounting bracket 16 with respect to the pair of fixed support pieces 108 and 108 and the contact support piece 112 provided at the upper opening edge of the cylindrical portion 102, 30 and the abutment piece 34 are overlapped and supported from below.

  The mount body 12 and the cylindrical bracket 20 are fixed to the fixing support pieces 108 and 108 with respect to the bolt insertion holes 32 and 32 formed in the fixing pieces 30 and 30 of the second mounting bracket 16. The bolts 110 and 110 are inserted to be positioned in the radial direction. In this embodiment, a stopper plate (not shown) in the form of a portal plate is inserted through the fixing bolts 110 and 110, and the fixing pieces 30 and 30 are connected to the fixing pieces 30 and 30 by nuts (not shown) screwed to the fixing bolts 110 and 110. The fixed support pieces 108 and 108 and a stopper fitting (not shown) are overlapped and fixed to each other. As a result, the second mounting bracket 16 is fixed to the cylindrical bracket 20 by the fixing bolts 110 and 110.

  Here, when the mount main body 12 is fitted into the cylindrical bracket 20 as described above, the outer diameter dimension of the large-diameter portion 40 that has the maximum outer diameter dimension in the cylindrical portion of the second mounting bracket 16 is set. The inner diameter of the cylindrical portion 102 of the cylindrical bracket 20 is smaller than the inner diameter at the position where the locking top portion 128 is formed. Therefore, it is possible to avoid applying a large stress to the cylindrical bracket 20 and to easily and quickly assemble the mount body 12 to the cylindrical bracket 20. A gap corresponding to the difference between the outer diameter dimension of the second mounting bracket 16 and the inner diameter dimension of the cylindrical portion 102 in the cylindrical bracket 20 exists between the two members 16 and 20. Since the fitting rubber 50 attached to the second mounting bracket 16 is interposed in a pinched state, the mount body 12 and the cylindrical bracket 20 are relatively displaced in the twisting direction and the radial direction. Is effectively prevented, and it is possible to advantageously realize securing of a slipping resistance due to frictional resistance of the fitting rubber 50 or the like.

  In particular, in the present embodiment, the fitting rubber 50 is pressed against the intermediate portion in the axial direction of the cylindrical portion 102 of the cylindrical bracket 20, and the shaft of the cylindrical portion 102 of the cylindrical bracket 20. It is spaced apart on the inner peripheral side with respect to the upper end portion in the direction. Further, in this embodiment, the press-contact portion 52 of the fitting rubber 50 is pressed against the lower taper surface 126 in the vicinity of the locking top portion 128 and the fixing portion 54 is in contact with the inner peripheral surface of the tubular portion 102. It is spaced apart on the inner circumference side.

  Further, the vibration-proof mount assembly 10 is provided with a pneumatic actuator 140 using a base metal fitting 114 fixed to the cylindrical bracket 20. The pneumatic actuator 140 includes a bottom plate member 142 fitted to the base metal fitting 114 and a rubber elastic wall 144 as an elastic partition wall.

  The bottom plate member 142 has a substantially disk shape, and is formed of a metal such as an aluminum alloy, a hard synthetic resin, or the like. In addition, a central protrusion 146 having a substantially inverted cup shape is integrally formed at the central portion of the bottom plate member 142. Further, the central protrusion 146 is integrally formed with a port 148 extending so that the central portion protrudes outward (downward in the axial direction). The bottom plate member 142 has a central portion fitted in the central hole 116 of the base metal fitting 114, and an outer peripheral edge overlapped with the bottom wall portion of the base metal fitting 114 and is assembled to the base metal fitting 114.

  The rubber elastic wall 144 has an annular plate shape as a whole, and its inner peripheral edge portion is vulcanized and bonded to the opening peripheral edge portion of the press fitting 150 as an output member having a substantially reverse cup shape. The pressing metal 150 is disposed above the base metal 114 and the bottom plate member 142 in the central portion of the base metal 114. A covering rubber 154 formed integrally with the rubber elastic wall 144 is attached to the entire surface of the pressing metal 150. Further, the outer peripheral edge portion of the rubber elastic wall 144 is vulcanized and bonded to a fitting ring 152 as a substantially annular fitting. The fitting ring 152 is an annular metal fitting that extends in the circumferential direction with a substantially L-shaped cross section having a peripheral wall portion and a bottom wall portion, and the bottom wall portion is embedded and fixed to the outer peripheral edge portion of the rubber elastic wall 144. The outer peripheral surface of the rubber elastic wall 144 is vulcanized and bonded to the inner peripheral surface of the peripheral wall portion.

  The fitting ring 152 is press-fitted and fixed to the peripheral wall portion of the base metal 114, so that the rubber elastic wall 144 is fixedly assembled to the base metal 114. In this state where the rubber elastic wall 144 is assembled to the base metal fitting 114, the outer peripheral edge portion of the rubber elastic wall 144 is fluid-tightly pressed against the outer peripheral edge portion of the bottom plate member 142, thereby the bottom plate member 142. A working air chamber 156 separated from the external space is formed between the facing surfaces of the pressing metal 150.

  A coil spring 157 is accommodated in the central portion of the working air chamber 156, and is disposed between the opposed surfaces of the bottom plate member 142 and the press fitting 150. The coil spring 157 is fitted to the central protrusion 146 and is positioned and supported. Further, the pressing metal member 150 is always urged in the direction away from the base metal member 114 in the axial direction by the urging force of the coil spring 157.

  In such a pneumatic actuator 140, the upper bottom portion of the press fitting 150 is disposed opposite to the center of the bottom portion of the partition member 58 with the diaphragm 60 interposed therebetween. In this state, when the working air chamber 156 is connected to the atmosphere, as shown in FIG. 1, the pressing fitting 150 is elastically protruded upward by the urging force of the coil spring 157. The diaphragm 60 is pressed against the opening of the recess 80 by the upper bottom portion of the pressing fitting 150.

  The anti-vibration mount assembly 10 having the above-described structure is configured such that the first mounting bracket 14 is fixed to a mounting bracket (not shown) with a mounting bolt 22 and the mounting bracket is also not shown. Is attached to the power unit side of the automobile. On the other hand, the fixing nut 106 provided on the mounting leg 104 of the cylindrical bracket 20 that is externally fitted and fixed to the second mounting bracket 16 is fixed to a vehicle body (not shown) such as a subframe in an automobile, so that the cylindrical bracket 20 is attached to the vehicle body side. As a result, the anti-vibration mount assembly 10 is interposed between the automobile power unit, which is one member to be anti-vibration connected, and the automobile body, which is the other member to be anti-vibration connected, and the power unit is attached to the vehicle body. It is designed to support vibration isolation.

  Note that, under such a state where the vibration isolating mount assembly 10 is mounted on an automobile, a shared support load of the power unit is exerted between the first mounting bracket 14 and the cylindrical bracket 20 in a substantially axial direction. The main rubber elastic body 18 is elastically deformed by a predetermined amount, and the first mounting bracket 14 and the second mounting bracket 16 in the mount body 12 are displaced by a predetermined amount in the approaching direction in the axial direction. Is done.

  Thereby, in a state where no external force is exerted, the diaphragm 60 is held at a position separated from the lower surface of the partition member 58, but in a state where the atmospheric pressure is exerted on the working air chamber 156, the pressing fitting 150 is elastically protruded upward based on the urging force of the coil spring 157, and the diaphragm 60 is pressed against the opening of the recess 80 by the upper bottom portion of the pressing metal 150. The second orifice passage 100 is maintained in a blocked state.

  In addition, when the anti-vibration mount assembly 10 is attached, an air pipe 158 is connected to a port 148 formed in the base metal fitting 114 constituting the pneumatic actuator 140, and through the air pipe 158, The working air chamber 156 is selectively connected to the atmosphere and the negative pressure source 160. That is, a switching valve 162 is disposed on the air pipe line 158 connected to the working air chamber 156. When the switching valve 162 is controlled by the control device 164 and switched, The working air chamber 156 is selectively switched and connected to the atmosphere and the negative pressure source 160.

  Then, by selectively applying atmospheric pressure and negative pressure to the working air chamber 156 in accordance with the running state of the automobile, the second orifice passage 100 is controlled to communicate / cut off, and the vibration-proof characteristic of the mount body 12 is switched. It can be changed. That is, the press fitting 150 is displaced downward against the urging force of the coil spring 157 under a state in which negative pressure is applied to the working air chamber 156 of the pneumatic actuator 140 from the outside. Thereby, the pressing force to the diaphragm 60 based on the urging force of the coil spring 157 is released, and the second orifice passage 100 is maintained in a communicating state. In addition, a buffer stopper rubber 166 protruding downward is formed on the upper bottom portion of the pressing metal 150, and the displacement amount of the pressing metal 150 when the pressing metal 150 is pulled down by negative pressure suction is the center of the buffer stopper rubber 166. The contact with the protrusion 146 is limited in a buffering manner.

  In the vibration proof mount assembly 10 of the present embodiment having the above-described structure, the base metal fitting 114 of the pneumatic actuator 140 is made of metal, and the fitting ring 152 is press-fitted into the peripheral wall portion of the base metal fitting 114, A rubber elastic wall 144 is fitted to the base metal fitting 114. Therefore, the rubber elastic wall 144 is firmly positioned and fixed with respect to the base metal fitting 114, and the close contact state of the rubber elastic wall 144 with the bottom plate member 142 can be effectively realized. Therefore, the target pressure can be effectively applied to the working air chamber 156 by controlling the switching valve 162, and the stable operation of the pneumatic actuator 140 can be advantageously realized.

  Moreover, when the resin-made cylindrical bracket 20 is injection-molded or the like, the base support 114 is formed as a separate metal member by embedding and fixing the connection support portions 118 and 118 integrally formed with the base support 114. There is no need for a special process for assembly when adopting. Therefore, excellent effects such as weight reduction by adopting a synthetic resin as the material of the cylindrical bracket 20 and securing of the airtightness of the working air chamber 156 by adopting a metal such as iron as the material of the base metal fitting 114 are obtained. The anti-vibration mount assembly 10 that can be realized at the same time can be realized with a small number of manufacturing steps.

  Further, in the vibration proof mount assembly 10 having the structure according to the present embodiment, the inner peripheral surface of the cylindrical portion 102 of the cylindrical bracket 20 extends from the upper opening edge and gradually inclines toward the outer peripheral side as it goes upward in the axial direction. The upper tapered surface 124 is configured. Therefore, the mount main body 12 can be easily fitted into the cylindrical bracket 20 by the guiding action of the upper tapered surface 124.

  Furthermore, in the vibration isolating mount assembly 10 having the structure according to the present embodiment, the inner peripheral surface of the cylindrical portion 102 of the cylindrical bracket 20 extends from the lower opening edge and extends axially upward in a part of the periphery. The lower tapered surface 126 that gradually inclines toward the inner peripheral side as it goes is formed. Thereby, it is possible to advantageously obtain a pull-out resistance against the bracket of the mount main body 12 due to the abutment engagement between the lower tapered surface 126 and the pressure contact portion 52 of the fitting rubber 50. Therefore, even when the fitting rubber 50 is elastically deformed when the mount body 12 is assembled to the cylindrical bracket 20, the mounting body 12 is attached to the cylindrical bracket 20 by the restoring force of the fitting rubber 50 after assembling. Thus, it is possible to prevent relative displacement upward.

  Furthermore, in the present embodiment, on the inner peripheral surface of the cylindrical bracket 20, a ridge line-like locking top portion 128 extending in the circumferential direction at the boundary between the upper and lower tapered surfaces 124 and 126 is formed. The locking top portion 128 is configured to contact and lock against the pressure contact portion 52 or the annular step surface 56 of the fitting rubber 50. Therefore, it is possible to more advantageously prevent the mount body 12 from coming off from the cylindrical bracket 20. In addition, in the present embodiment, the locking top portion 128 is gradually narrowed toward the protruding tip side, and has a bowl shape in the longitudinal section. Therefore, the locking force due to the contact between the locking top portion 128 and the fitting rubber 50 is more effectively exhibited.

  In particular, in the present embodiment, the outer diameter is made smaller than the inner diameter of the cylindrical bracket 20, and the pair of integrally formed connection support portions 118, 118 are long enough to be embedded and fixed in the cylindrical bracket 20. By adopting the base metal fitting 114 having a specific shape projecting into the upper and lower sides, the upper and lower tapered surfaces 124 and 126 are formed by making effective use of the demolding taper of the upper and lower molds 130 and 132. Therefore, the excellent effects as described above due to the provision of the upper and lower tapered surfaces 124 and 126 are obtained by shaving the inner peripheral surface after molding the cylindrical bracket 20 or adopting a special structure for providing the tapered surface. It can be realized easily without any problems.

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

  For example, the base metal fitting 114 as the bottom metal fitting in the above embodiment is provided with a connection support portion 118 as a pair of connection portions at positions opposed in one radial direction. However, the connecting portions are not necessarily a pair, and any number of connecting portions may be provided as long as they are provided at two or more locations on the circumference.

  In addition, the connecting portion provided in the bottom bracket does not necessarily need to be formed so as to extend from the peripheral edge of the opening of the bottom bracket toward the outer peripheral side as in the above-described embodiment, for example, the peripheral wall portion of the bottom bracket It may be provided so as to extend from the axially intermediate portion to the outer peripheral side.

  In the above embodiment, the central hole 116 penetrating the center of the bottom wall portion of the base metal fitting 114 is formed, and the base metal fitting 114 has a substantially annular shape. The shape is not limited by the description of the embodiment. Specifically, for example, a bottom metal fitting having a shallow bottomed cylindrical shape in which the bottom wall portion has a disk shape and does not have a through hole such as the central hole 116 in the bottom wall portion is adopted. You can also. When such a bottom metal fitting is employed, the port 148 may be formed on the bottom metal fitting without employing another member having the port 148 such as the bottom plate member 142 in the above embodiment.

  In the above-described embodiment, the upper taper surface 124 and the lower taper surface 126 are formed on the inner peripheral surface of the portion of the base metal bracket 114 that is away from the connection support portion 118 on the periphery of the cylindrical portion 102 of the cylindrical bracket 20. In addition, a locking top portion 128 is formed at the boundary between the upper and lower tapered surfaces 124 and 126. However, it is not necessary that the upper and lower tapered surfaces having different inclination directions are formed on the inner peripheral surface of the cylindrical portion 102 in the portion where the fixed portion of the connection support portion 118 is removed. In this portion, the lower taper surface 126 may be formed over the entire axial direction of the inner peripheral surface.

  The specific structure of the mount body 12 shown in the above embodiment is merely an example, and the present invention is a pneumatic switching type of various vibration isolation mounts whose vibration isolation characteristics can be switched by a pneumatic actuator. Is applicable.

  In the above embodiment, the overlapping surface of the central convex portion 136 of the upper mold 130 and the ribs 138 and 138 of the lower mold 132 is a flat surface extending in the axial direction. By making the overlapping surface into a tapered surface, the upper and lower molds may be easily aligned.

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

The longitudinal cross-sectional view of the vibration proof mount assembly as one Embodiment of this invention. The longitudinal cross-sectional view of the cylindrical bracket which comprises the vibration proof mount assembly shown by FIG. The bottom view of the cylindrical bracket shown by FIG. The longitudinal cross-sectional view which shows the assembly state of the shaping die of the cylindrical bracket shown by FIG.

Explanation of symbols

10: anti-vibration mount assembly, 12: mount main body, 14: first mounting bracket, 16: second mounting bracket, 18: rubber elastic body of main body, 20: cylindrical bracket, 50: fitting rubber, 58: Partition member, 60: Diaphragm, 70: Pressure receiving chamber, 72: Equilibrium chamber, 92: First orifice passage, 100: Second orifice passage, 102: Cylindrical portion, 104: Mounting leg portion, 114: Base fitting, 118: Connection support portion, 122: Clearance, 124: Upper taper surface, 126: Lower taper surface, 128: Locking top portion, 130: Upper die, 132: Lower die, 135: Molding cavity, 140: Pneumatic actuator 144: Rubber elastic wall, 150: Press fitting, 152: Fitting ring, 156: Working air chamber

Claims (7)

In the resin cylindrical bracket provided with a cylindrical portion that is fitted and fixed to the vibration-proof mount,
A bottom fitting for a pneumatic actuator having a dish shape and having an outer diameter smaller than the inner diameter of the cylindrical portion is disposed in the opening portion on the lower side in the axial direction of the cylindrical portion. A plurality of connecting portions projecting toward the outer peripheral side are integrally formed at a plurality of locations on the periphery of the metal fitting, and the connecting portions are embedded and fixedly supported at the lower end portion of the cylindrical portion. The upper taper surface extending from the axially upper opening of the cylindrical part and gradually reducing the diameter toward the axially lower opening is formed in the part where the connecting part is fixed on the circumference of the cylindrical part. In the portion that is provided on the inner peripheral surface of the cylindrical portion and is disengaged from the connecting portion on the circumference of the cylindrical portion, the cylindrical portion extends from the axially lower opening to the axially upper opening. A resin cylindrical bra characterized in that a lower taper surface that gradually decreases in diameter is provided on the inner peripheral surface of the cylindrical portion. Tsu door.   A mounting leg portion attached to the vibration isolation target member is formed integrally with the cylindrical portion, and the mounting leg portion is formed so as to extend from the lower end in the axial direction of the cylindrical portion to the outer peripheral side. The resin-made cylindrical bracket according to claim 1, wherein the connecting portion integrally formed with the bottom metal part extends outward from the cylindrical portion and is fixedly embedded in the mounting leg portion.   On the periphery of the cylindrical part, the inner peripheral surface of the cylindrical part is formed in a region from the axially intermediate part of the cylindrical part to the opening on the upper side in the axial direction. It is composed of the upper taper surface and the lower taper surface formed in a region extending from the axially intermediate portion of the cylindrical portion to the axially lower opening, and in the circumferential direction at the boundary between the upper and lower taper surfaces The resin-made cylindrical bracket according to claim 1, wherein a locking top portion that extends in the direction of the inner periphery and protrudes toward the inner peripheral side is formed to be locked to the vibration-proof mount. An anti-vibration mount assembly configured by fitting an anti-vibration mount to the resin cylindrical bracket according to any one of claims 1 to 3,
An output member is provided separately above the bottom metal fitting, and the inner peripheral edge of the annular plate-like elastic partition is fixed to the output member, and the outer peripheral edge of the elastic partition is annular The pneumatic actuator has a working air chamber sealed from the outside between the output member and the bottom metal fitting by fixing the fitting metal to the bottom metal fitting. An anti-vibration mount assembly characterized in that the anti-vibration characteristics of the anti-vibration mount can be switched by driving and displacing the output member with air pressure exerted on the working air chamber.   As the anti-vibration mount, a first attachment member attached to one of the anti-vibration target members is fitted into the plastic cylindrical bracket and attached to the other anti-vibration target member. The first mounting member and the second mounting member are mutually connected by the main rubber elastic body, while the partition member is supported by the second mounting member. On one side of the partition member, a part of the wall portion is formed of the main rubber elastic body to form a pressure receiving chamber in which pressure fluctuation is generated when vibration is input, and the other side of the partition member is sandwiched On the side of this, an equilibrium chamber in which a part of the wall portion is made of a flexible film and volume change is allowed is formed, and an incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber. The first orifice that connects the pressure receiving chamber and the equilibrium chamber to each other A structure in which a second orifice passage tuned in a higher frequency range than the first orifice passage is provided is adopted, and the output member of the pneumatic actuator is driven to displace the second orifice passage. The vibration-proof mount assembly according to claim 4, wherein the vibration-proof characteristic of the vibration-proof mount is switched by switching the orifice path of the vibration-proof to a communication state or a cutoff state.   A fitting rubber is formed on the outer peripheral surface of the second mounting member of the vibration-proof mount, and the fitting rubber is brought into contact with and locked to the lower taper surface of the resin cylindrical bracket. The anti-vibration mount assembly according to claim 5, wherein the anti-extraction force of the anti-vibration mount with respect to the resin cylindrical bracket is exhibited. A mold preparing step for preparing in advance a mold including an upper mold and a lower mold for setting the inner peripheral surface shape of the cylindrical section as a molding mold for the cylindrical section;
The molding die including the upper die and the lower die is combined to form a molding cavity, and the bottom fitting is sandwiched between the upper die and the lower die so as to be integrated with the bottom fitting. A mold matching step for positioning the formed connecting portion so as to extend into the molding cavity;
A molding step of filling the molding cavity with a synthetic resin material and molding the resin cylindrical bracket into which the bottom metal fitting is inserted,
A demolding step of removing a molding die from the molded resin cylindrical bracket;
When manufacturing the resin cylindrical bracket according to any one of claims 1 to 3,
The upper mold is removed from the resin cylindrical bracket in the axial direction, and is formed on the inner peripheral surface of the cylindrical portion by using a demolding taper surface of the upper mold. The upper taper surface is formed so as to extend from the upper opening edge of the cylindrical portion, and the lower mold is removed downward from the resin cylindrical bracket, and the lower mold is removed. The lower taper surface is formed so as to extend from the lower opening edge of the cylindrical portion by using a taper surface for a mold, and the lower mold is formed at a portion on the circumference of the cylindrical portion where the connecting portion is removed. Of the resin cylindrical bracket, wherein the lower taper surface is formed to extend upward from the bottom metal part at a portion where the connection portion is removed. Production method.

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