JP2006118547A - Fluid sealed vibration proof device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid sealed vibration proof device having novel construction for reducing abnormal sounds resulting from a movable plate hitting the inner face of a storage space while suppressing the transmission of vibration resulting from such an impact upon hitting. <P>SOLUTION: The device adopts a partition member 42 which is constructed by connecting an orifice member 44 securely supported by a second mounting member 14 to a partition member body 46 arranged on the inner periphery side of the orifice member 44 with a connecting rubber elastic body 48 arranged between the orifice member 44 and the partition member body 46. The partition member body 46 as part of the partition member 42 has the storage space 60 for storing the movable plate 82. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-vibration device used as, for example, an automobile engine mount and the like, and in particular, a fluid-filled vibration-proof vibration device that obtains a vibration-proof effect by utilizing the flow action of an incompressible fluid sealed inside. It relates to the device.

  Conventionally, an anti-vibration device in which a first attachment member and a second attachment member are connected by a main rubber elastic body as an anti-vibration coupling body or an anti-vibration support body interposed between members constituting a vibration transmission system. Is widely adopted in various fields, and as one type, the first mounting member and the second mounting member are connected by a main rubber elastic body, and a part of the wall portion is configured by the main rubber elastic body. A pressure receiving chamber in which a pressure fluctuation is generated when vibration is input between the mounting member and the second mounting member, and a part of the wall portion is configured by the flexible film, and the volume is based on the deformation of the flexible film. A fluid-filled type vibration isolator that forms an equilibrium chamber in which changes occur, encloses an incompressible fluid in the pressure receiving chamber and the equilibrium chamber, and has an orifice passage that communicates the pressure receiving chamber and the equilibrium chamber with each other Has been proposed.

  In such a fluid-filled vibration isolator, it is possible to obtain an anti-vibration effect using a fluid action such as a resonance action of the enclosed incompressible fluid, and only with the anti-vibration action of the main rubber elastic body. Low dynamic spring effect and high damping effect can be easily obtained in the tuning frequency range. For example, it can be applied to engine mounts for automobiles that require high vibration isolation performance in a specific frequency range. Is being considered.

  By the way, in an engine mount for automobiles, the frequency of vibrations to be vibrated may differ depending on the traveling state or the like. However, the anti-vibration effect exerted based on the resonance action of the fluid flowing through the orifice passage is limited to a relatively narrow frequency range in which the orifice passage is previously tuned. Therefore, in such a fluid-filled vibration isolator, when vibration in a frequency range higher than the tuning frequency of the orifice passage is input, the orifice passage is substantially closed, and thus, There is a problem that high vibration springs are generated and the vibration isolation performance is lowered.

  Therefore, in order to avoid a significant increase in the dynamic spring at the time of vibration input in a frequency range higher than the tuning frequency range of the orifice passage and to improve the vibration isolation performance, in a state of being fixedly supported by the second mounting member. An accommodation space is formed in the partition member that separates the pressure receiving chamber and the equilibrium chamber, and a movable plate is accommodated and arranged in such a manner that the movable plate can be slightly displaced with respect to the accommodation space, and the accommodation space is connected to the pressure receiving chamber and the equilibrium chamber through respective through holes. In addition, a fluid-filled vibration isolator has been proposed in which the pressure of the pressure receiving chamber is exerted on one surface of the movable plate and the pressure of the equilibrium chamber is exerted on the other surface through the through holes (Patent Document). 1).

  In the fluid-filled vibration isolator having such a structure, when a vibration in a high frequency range is input, a minute pressure fluctuation in the pressure receiving chamber is caused by a displacement of the movable plate based on a pressure difference between the pressure receiving chamber and the equilibrium chamber. It escapes to the equilibrium chamber and absorbs it. On the other hand, at the time of vibration input in the low frequency range in which the orifice passage is tuned, the amplitude of the vibration is large, so that the movable plate is in contact with the inner surface of the accommodation space and is substantially overlapped. It will be blocked. Therefore, pressure absorption in the pressure receiving chamber is avoided, and relative pressure fluctuations between the pressure receiving chamber and the equilibrium chamber are effectively generated, and a sufficient amount of fluid flow through the orifice passage between the two chambers is ensured. Thus, the vibration isolation effect by the orifice passage is effectively exhibited.

  However, in the fluid-filled vibration isolator having such a structure, when a large amplitude vibration is input and a sudden pressure fluctuation is generated in the pressure receiving chamber, the movable plate strikes the inner surface of the accommodation space vigorously. . Therefore, the vibration of the partition member due to the impact when the movable plate strikes the inner surface of the accommodation space is transmitted to the second mounting member that fixedly supports the partition member, so that it is recognized as sound or vibration. There was a problem that. Therefore, when the fluid-filled vibration isolator having the above-described structure is employed as, for example, an engine mount for an automobile, a difference that can be heard by the driver when the engine is cranked or over the step is used. There was also a risk that it would become a noise and one of the causes of lowering the ride feeling.

Japanese Patent Publication No. 4-17291

  Here, the present invention has been made in the background as described above, and the problem to be solved is to suppress the transmission of vibration caused by the impact when the movable plate strikes the inner surface of the accommodation space. Thus, it is an object of the present invention to provide a fluid-filled vibration isolator having a novel structure that can reduce the occurrence of abnormal noise caused by such hitting.

  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, or an invention idea that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.

  According to the first aspect of the present invention, the main mounting rubber elastic body connects the first mounting member attached to one member to be anti-vibrated and the second mounting member attached to the other member to be anti-vibrated. A pressure receiving chamber in which a part of the wall part is constituted by the main rubber elastic body and pressure fluctuation is generated at the time of vibration input, and a balance in which a part of the wall part is constituted by a flexible film and volume change is allowed. Chambers are formed on both sides of the partition member supported by the second mounting member, incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber, and the pressure receiving chamber and the equilibrium chamber are mutually connected. While providing the communicating orifice passage, the movable plate is accommodated in the accommodating space provided in the partition member, and through holes are formed to connect the accommodating space to the pressure receiving chamber and the equilibrium chamber, respectively. Through which the pressure of the pressure receiving chamber is applied to one surface of the movable plate. In addition, the pressure of the equilibrium chamber is exerted on the other surface, so that a minute pressure fluctuation in the pressure receiving chamber at the time of vibration input is released to the equilibrium chamber through the movable plate and absorbed. In the vibration isolator, the partition member is fixedly supported by the second mounting member, and an annular orifice member, and a partition member main body arranged on the inner peripheral side of the orifice member, and the orifice member Are connected by a connecting rubber elastic body arranged between the partition member main body and the orifice passage is constituted by the orifice member, while the movable plate is accommodated in the partition member main body. The accommodation space to be arranged is provided, and a pair of wall portions opposed to each other in the movable direction of the movable plate among the wall portions defining the accommodation space in the partition member body. By the through holes are formed in, respectively, that the accommodation space is connected to the equilibrium chamber and the pressure receiving chamber, characterized.

  In the fluid-filled vibration isolator having the structure according to this aspect, the partition member main body in which the movable plate is accommodated is elastically supported with respect to the second mounting member via the connecting rubber elastic body. Yes. Thereby, the vibration of the partition member main body due to the impact when the movable plate strikes the inner surface of the accommodation space is reduced or absorbed based on the elastic deformation of the connecting rubber elastic body.

  Therefore, in the fluid-filled vibration isolator according to this aspect, the partition caused by the impact when the movable plate hits the inner surface of the accommodation space by reducing or absorbing vibration based on the elastic deformation of the connecting rubber elastic body. It becomes possible to suppress the transmission of the vibration of the member main body to the second mounting member, and as a result, it is possible to reduce the occurrence of abnormal noise or the like due to the impact of the movable plate against the inner surface of the accommodation space.

  Further, in the fluid filled type vibration damping device according to this aspect, the orifice member constituting the orifice passage is positioned at the outermost peripheral portion of the partition member, so that the passage length of the orifice passage constituted by the orifice member is Can be advantageously ensured, whereby a large degree of freedom in tuning the orifice passage can be ensured.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator according to the first aspect, a resonance frequency of a vibration system configured by the partition member main body and the coupling rubber elastic body is the second attachment. It is characterized by being tuned to a frequency different from the natural frequency of the other member to be vibration-proofed, to which the member is attached. In the fluid-filled vibration isolator having such a structure according to the present embodiment, a decrease in the vibration isolating performance due to the resonance action of the vibration system constituted by the partition member main body and the connecting rubber elastic body is avoided. The anti-vibration performance can be obtained more effectively.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator according to the first or second aspect, between the partition member main body and a metal sleeve disposed on the outer peripheral side of the partition member main body. The connecting rubber elastic body is disposed, and the connecting rubber elastic body is bonded to the partition member main body and the metal sleeve, while the orifice member has a press-fitting hole into which the metal sleeve is press-fitted, and The metal sleeve is press-fitted and fixed to the orifice member, whereby the partition member main body and the orifice member are connected by the connecting rubber elastic body. In the fluid-filled vibration isolator having such a structure according to this aspect, it is possible to reduce the size of the molding die when vulcanizing and molding the connected rubber elastic body.

  According to a fourth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to third aspects, the inner hole of the orifice member is perpendicular to the central axis of the orifice member. The partition member main body is disposed on the inner peripheral side of the orifice member at a position displaced in a direction perpendicular to the central axis of the orifice member. And In the fluid-filled vibration isolator having the structure according to this aspect, the opening to the pressure receiving chamber side of the orifice passage formed in the orifice member and the equilibrium chamber side while ensuring a large size of the partition member main body It is possible to form the opening at a position close to the central axis of the orifice member.

  According to a fifth aspect of the present invention, in the fluid-filled vibration damping device according to any one of the first to fourth aspects, the movable plate is constituted by a movable rubber plate formed of a rubber elastic body, It is characterized in that at least a part of the movable plate is a corrugated portion having a continuous corrugation and spreading in a substantially corrugated shape. In the fluid-filled vibration isolator having such a structure according to this aspect, a wave-like portion having a substantially corrugated plate shape is provided for the movable rubber plate itself constituting the movable plate, and when a large amplitude vibration is input, Based on the pressure difference between the pressure receiving chamber and the equilibrium chamber that are applied to both sides of the movable rubber plate in the plate thickness direction, the wavy portion is repeatedly brought into contact with the inner surface of the accommodation space, or further from a state in which the wave-like portion is contacted in advance It is made to contact | abut in a wider range so that it may be pressed. That is, when the movable rubber plate comes into contact with the inner surface of the accommodation space, the liquid pressure is applied to the surface of the corrugated portion through the through hole and presses the movable rubber plate toward the inner surface of the accommodation space, and the inner surface of the accommodation space The pressing reaction force received from the lens acts. As a result, the wave-like portion is elastically deformed as a whole, and it is possible to effectively absorb the impact at the time of contact as described above based on the damping force and elasticity accompanying the elastic deformation of the wave-like portion.

  Therefore, in the fluid-filled vibration isolator according to this aspect, it is possible to reduce the impact itself when the movable rubber plate strikes (contacts) the inner surface of the accommodation space, thereby accommodating the movable rubber plate. It is possible to further reduce the occurrence of abnormal noise caused by hitting the inner surface of the space.

  In addition, in this aspect, a part (each convex part in thickness direction both surfaces) of a wavy part may be contact | abutted previously to the accommodation space inner surface, or the whole is between the opposing inner surfaces of a accommodation space. It may be displaceable in a floating state. In the former case, the impact caused by the contact of the wavy portion is a hit at the contact portion that spreads by applying vibration compared to the contact portion in the initial state where vibration is not applied, or when vibration is input Due to the elastic deformation of the wavy portion, the contact portion in the initial state is caused by the contact with the initial contact portion by repeating the separation and contact with the inner surface of the accommodation space. In the latter case, the impact caused by the contact of the wavy portion is generated by a hit or the like when the amplitude of the input vibration increases and the wavy portion comes into contact with the inner surface of the accommodation space and the amount of displacement is restricted. To do.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator according to the fifth aspect, the corrugated portion has a buffer lip protrusion integrally formed on a surface that contacts the inner surface of the accommodation space. It is characterized by that. In the fluid-filled vibration isolator having the structure according to this aspect, the impact at the time of contact of the movable rubber plate against the inner surface of the accommodation space (partition member main body) is not only due to the deformation of the entire waved portion. Also, absorption and reduction can be achieved by elastic deformation of the buffer lip protrusion. In particular, since the buffer lip protrusion is formed with a soft spring characteristic with respect to the entire corrugated portion, it acts in a complementary manner to the deformation of the entire corrugated portion, and further lowers from the beginning to the end of contact. It is possible to more effectively absorb and reduce a wide range of shocks from high frequencies to high frequencies.

  Therefore, in the fluid-filled vibration isolator according to this aspect, it is possible to further reduce the impact itself when hitting the inner surface of the accommodation space of the movable rubber plate, and thereby the inner surface of the accommodation space of the movable rubber plate. It is possible to further reduce the occurrence of abnormal noise or the like due to hitting.

  In addition, the buffer lip protrusion may extend in a line shape, for example, or may be scattered in a dot shape. Further, a plurality of buffer lip protrusions having different protrusion heights may be formed, or the protrusion heights of the buffer lip protrusions extending in one line may be partially different.

  According to a seventh aspect of the present invention, in the fluid-filled vibration isolator according to the fifth or sixth aspect, a central portion of the movable rubber plate is a circular flat plate portion, and the movable rubber plate It is characterized in that the corrugated portion is formed by forming the outer peripheral portion of the ring plate into a circular plate shape undulating in the circumferential direction over the entire circumference. In the fluid-filled vibration isolator having the structure according to this aspect, by providing both the flat plate-like portion and the wave-like portion, the wave-like portion absorbs and relaxes the shock when contacting the inner surface of the accommodation space. While obtaining the action, it is possible to ensure the fluid flow amount in the orifice passage by the reliable narrowing or blocking of the through hole by the flat plate portion.

  According to an eighth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the fifth to seventh aspects, the movable rubber plate has a plate thickness with respect to the accommodation space over the whole. The movable rubber plate is disposed so as to be minutely displaceable with a predetermined amount of gap in the direction, and when the movable rubber plate is displaced and abuts against the inner surface of the storage space, the wavy shape is formed on at least one surface of the movable rubber plate. It is characterized in that the portion first comes into contact with the inner surface of the accommodation space. In the fluid-filled vibration isolator having the structure according to this aspect, the entire movable rubber plate is displaced in the plate thickness direction in an unconstrained free state by the gap size between the inner surfaces facing each other in the accommodation space. Is acceptable. Therefore, at the time of vibration input, the entire movable rubber plate is allowed to be displaced while floating in the accommodation space, and the pressure absorbing function of the pressure receiving chamber can be more effectively exhibited.

  Further, in this aspect, when the movable rubber plate is displaced and comes into contact with the inner surface of the accommodation space in the partition member main body, the wavy portion is first on the inner surface of the accommodation space on at least one surface of the movable rubber plate. For example, even when the wavy portion is formed on a part of the movable rubber plate, the wavy portion is first brought into contact with the inner surface of the accommodation space, so that The impact at this time can be effectively absorbed by the elastic deformation action of the wavy portion from the initial contact stage. Therefore, it is possible to more effectively exhibit the effect of reducing the occurrence of abnormal noise or the like due to the wavy portion.

  According to a ninth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the fifth to eighth aspects, the convex portion on the one surface side and the other surface of the wavy portion of the movable rubber plate The swell height dimension in the plate thickness direction between the convex portion on the side is made smaller than the distance between the opposed inner surfaces of the accommodation space, so that the movable rubber plate The corrugated portion is housed and arranged so as to be displaceable with a predetermined gap in the plate thickness direction, and the corrugated portion is configured to contact the inner surface of the housing space by displacement in the plate thickness direction. . In the fluid-filled vibration isolator having such a structure according to this aspect, the entire wavy portion is displaced in the thickness direction in an unconstrained free state only by the gap dimension between the inner surfaces facing each other in the accommodation space. Permissible. Therefore, at the time of vibration input, the entire wavy portion is allowed to be displaced in a state of floating in the accommodation space, and the pressure absorbing function of the pressure receiving chamber can be exhibited more advantageously.

  According to a tenth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to ninth aspects, the second mounting member has a substantially cylindrical shape, and one of the second mounting members The first mounting member is spaced apart on the opening side of the first mounting member, and one opening of the second mounting member is formed by the main rubber elastic body connecting the first mounting member and the second mounting member. A fluid-tight cover is provided, and the other opening of the second mounting member is fluid-tightly covered with the flexible film, while the orifice member in the partition member is fixedly fixed by the second mounting member. The partition member is sandwiched between the opposing surfaces of the main rubber elastic body and the flexible membrane so as to spread in the direction perpendicular to the axis of the second mounting member. The pressure receiving chamber and the equilibrium chamber are formed on both sides, and the partition member The housing space is formed so as to extend in a direction perpendicular to the axis of the second mounting member in the interior of the partition member main body, and the space is expanded in a direction perpendicular to the axis of the second mounting member with respect to the housing space. It is characterized in that the movable plate is accommodated and arranged.

  In the fluid-filled vibration isolator having the structure according to this aspect, the pressure receiving chamber and the equilibrium chamber can be efficiently formed on both sides of the partition member, and the fluid-filled vibration isolator is compact as a whole. Can be realized. As a result, it can be used particularly advantageously as an engine mount for automobiles, for example.

  As is clear from the above description, in the fluid-filled vibration isolator having the structure according to the present invention, the partition member body provided with a housing space in which the movable plate is housed and arranged is an orifice member, The partition member main body caused by the impact when the movable plate hits the inner surface of the accommodation space because it is elastically supported by the connecting rubber elastic body with respect to the second mounting member that fixedly supports the orifice member It is possible to suppress the transmission of vibration based on the elastic deformation of the connecting rubber elastic body, thereby reducing the occurrence of abnormal noise caused by striking the inner surface of the accommodation space of the movable plate It becomes.

  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 automobile engine mount 10 as an embodiment of the present invention. The engine mount 10 has a structure in which a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are connected by a main rubber elastic body 16. The engine mount 10 has the first mounting bracket 12 attached to the power unit side, while the second mounting bracket 14 is attached to the body side, so that the power unit is mounted on the body to other engine mounts (not shown). It has come to support the anti-vibration in cooperation with. That is, in the present embodiment, one member that is vibration-proof connected by the power unit is configured, and the other member that is vibration-proof connected by the body is configured. Also, under such a mounted state, the engine unit 10 is subjected to a shared support load of the power unit, and accordingly, the main rubber elastic body 16 is elastically deformed, and the first mounting bracket is attached. 12 and the second mounting member 14 are adapted to be relatively displaced by approaching a predetermined amount in the vertical direction in FIG. And the main vibration which should be vibrated is input into the substantially up-down direction in FIG. 1 between the 1st mounting bracket 12 and the 2nd mounting bracket 14. FIG.

  More specifically, the first mounting member 12 has a substantially disk shape, and a mounting bolt 18 protruding upward (upper side in FIG. 1) is fixedly provided at the center portion thereof. In addition, a holding fitting 20 is fixed to the lower surface of the first mounting fitting 12 on the central axis thereof. The holding metal fitting 20 is provided with a tapered peripheral wall portion that gradually expands toward the upper opening, and is fixed to the lower surface of the first mounting metal 12 at the opening edge.

  On the other hand, the second mounting bracket 14 has a large-diameter substantially cylindrical shape, and is below the first mounting bracket 12 on the substantially same central axis as the first mounting bracket 12 (lower side in FIG. 1). Are spaced apart. In addition, the second mounting bracket 14 has a structure in which a fitting tube portion 24 that protrudes downward in the axial direction from the outer peripheral edge portion of the substantially annular plate-shaped rubber fixing portion 22 is integrally formed. ing. The inner peripheral portion of the rubber adhering portion 22 has a tapered inclined shape that is gradually inclined downward in the axial direction toward the center.

  A main rubber elastic body 16 is disposed between the opposing surfaces of the first mounting bracket 12 and the second mounting bracket 14. The main rubber elastic body 16 has a large-diameter, generally frustoconical shape, and a large hollow recess 26 is formed at the center thereof. The circular recess 26 is a bottomed reverse circular hole that gradually expands in the downward direction and opens to the end surface on the large diameter side. By forming the circular recess 26, the main rubber elastic body 16 is a thick inverted cup shape as a whole.

  The first mounting bracket 12 is superposed on the end surface on the small diameter side on the upper side in the axial direction of the main rubber elastic body 16, and the holding bracket 20 and the first mounting bracket are welded and fixed to the lower surface of the first mounting bracket 12. A main rubber elastic body 16 is vulcanized and bonded to 12. In the present embodiment, the main rubber elastic body 16 is also filled in the holding metal fitting 20. Further, the rubber fixing portion 22 of the second mounting bracket 14 is inserted from the outer peripheral surface to the large-diameter side end portion of the main rubber elastic body 16 and vulcanized and bonded in a substantially embedded state. That is, in the present embodiment, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting bracket 12 and the second mounting bracket 14.

  In addition, a substantially annular plate-shaped reinforcing metal fitting 28 is fixed to an axially intermediate portion of the main rubber elastic body 16 which is formed in a thick cylindrical shape, and the spring characteristics of the main rubber elastic body 16 are adjusted. In addition, a seal rubber layer 30 is attached to the second mounting bracket 14 so as to cover substantially the entire lower surface of the rubber fixing portion 22 and the inner peripheral surface of the fitting tube portion 24. The seal rubber layer 30 is integrally formed with the main rubber elastic body 16.

  As described above, the integrally vulcanized molded product of the main rubber elastic body 16 including the first and second mounting brackets 12 and 14 is flexible from the opening on the lower side in the axial direction of the second mounting bracket 14. A diaphragm 32 as a membrane is assembled.

  The diaphragm 32 has a substantially disk shape that has a sufficient slack in the central portion and can be easily deformed. Further, the diaphragm 32 is vulcanized and bonded to the fitting 34 at the outer peripheral edge thereof. The fitting 34 has a structure in which a cylindrical fixed tube portion 38 protruding upward from an outer peripheral edge portion is integrally formed with an annular plate-shaped support portion 36. The outer peripheral edge of the diaphragm 32 is vulcanized and bonded to the inner peripheral edge. In addition, the fixed cylinder portion 38 of the fitting 34 is extrapolated to the fitting cylinder 24 of the second mounting bracket 14 and subjected to diameter reduction processing such as eight-way drawing. Thereby, the fixed cylinder part 38 of the fitting 34 is externally fixed to the fitting cylinder part 24. The space between the fitting surfaces of the fixed cylinder part 38 and the fitting cylinder part 24 is fluid-tightly sealed with a seal rubber layer 40 formed on the fixed cylinder part 38.

  Thus, the center of the second mounting bracket 14 in the circular recess 26 formed in the main rubber elastic body 16 is obtained by externally fixing the fixed cylindrical portion 38 of the fitting 34 to the fitting cylinder 24. An opening portion opened downward through the hole is covered with a diaphragm 32 in a fluid-tight manner. An incompressible fluid is sealed in a region between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 32 that is formed using the circular recess 26 and is sealed in an external space. An enclosed area is defined. For example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is employed as the incompressible fluid sealed in the fluid sealing region, and in particular, in order to effectively obtain a vibration isolation effect based on the fluid flow action. It is desirable to employ a low viscosity fluid of 0.1 Pa · s or less. The incompressible fluid is sealed by, for example, assembling the diaphragm 32 to the integrally vulcanized molded product of the main rubber elastic body 16 including the first and second mounting brackets 12 and 14 in the incompressible fluid. Etc.

  Further, a partition member 42 is disposed in the fluid sealing region so as to spread in the direction perpendicular to the axis. As shown in FIGS. 2 to 4, the partition member 42 has a structure in which an orifice member 44 and a partition member main body 46 are connected by a connecting rubber elastic body 48. The orifice member 44 has a substantially annular block shape including a circular inner hole 50 penetrating the central portion in the thickness direction, and is formed of a light hard material such as an aluminum alloy in the present embodiment. . Therefore, in the present embodiment, the central axis of the inner hole 50 is biased in the radial direction, whereby the radial width dimension of the orifice member 44 changes in the circumferential direction. That is, in the present embodiment, the inner hole 50 is formed not at the center axis of the orifice member 44 but at a position shifted outward in the direction perpendicular to the axis with respect to the center axis of the orifice member 44.

  The partition member main body 46 is constituted by a main body metal fitting 52 and a lid plate metal fitting 54. The main body metal fitting 52 is provided with a circular housing recess 56 that opens upward, and has a shallow bottomed cylindrical shape as a whole. In the present embodiment, the accommodation recess 56 has a substantially constant depth throughout. The body fitting 52 is made of a metal such as an aluminum alloy, a hard synthetic resin, or the like. In the present embodiment, the body fitting 52 is made of a high specific gravity metal material such as steel. On the other hand, the lid plate metal 54 is formed into a disk shape as a whole, and is formed of the same material as that of the main body metal 52.

  The lid plate metal 54 is fixedly assembled to the main body metal 52 so as to overlap the upper surface of the main body metal 52 (the opening end surface of the housing recess 56). Therefore, in the present embodiment, the plurality of positioning protrusions 58 provided on the main body metal fitting 52 are inserted into the plurality of positioning holes 59 formed in the cover plate metal 52 so that the cover plate metal 54 and the main body metal 52 are positioned. In the aligned state, the positioning projection 58 is caulked to fix the lid plate metal 54 to the main body metal 52. In this way, the lid plate metal 54 is fixed to the main body metal 52, so that the opening of the accommodation recess 56 formed in the main body metal 52 is covered with the lid plate metal 54. As a result, inside the partition member main body 46, a hollow housing space 60 is formed that spreads in a disk shape with a substantially constant inner diameter and height. That is, the storage space 60 is formed between the axially opposed surfaces of the pair of flat inner surfaces 62 and 64 that extend in the direction perpendicular to the axis, and as shown by the phantom lines in FIG. The distance between the opposing surfaces of the inner surfaces 62 and 64: L is a predetermined distance from the maximum thickness dimension (plate thickness dimension including the buffer lip protrusions 94, 96, 98, 104, 106) of the movable rubber plate 82 described later: T Only set larger.

  A cylindrical metal sleeve 66 is disposed on the concentric shaft at a predetermined distance outside the radial direction of the partition member main body 46 having such a structure. A connecting rubber elastic body 48 is interposed between the partition member main body 46 and the metal sleeve 66.

  The connecting rubber elastic body 48 has a thick annular plate shape as a whole, and its inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the body fitting 52, and its outer peripheral surface is the inner surface of the metal sleeve 66. It is vulcanized and bonded to the peripheral surface. That is, the connecting rubber elastic body 48 is formed as an integrally vulcanized molded product including the metal sleeve 66 and the main body fitting 52.

  Therefore, in this embodiment, as shown in FIG. 5, the location where the positioning projection 58 is formed in the main body metal fitting 52 is projected outward in the radial direction compared to the other portions. Yes. Thereby, in the connecting rubber elastic body 48, the radial dimension is made smaller at the circumferential position corresponding to the positioning protrusion 58 provided on the main body fitting 52 than at other portions. In addition, the positioning protrusions 58 formed on the main body metal fitting 52 are positioned at equal intervals in the circumferential direction, so that portions of the connecting rubber elastic body 48 whose radial dimensions are reduced are equally spaced in the circumferential direction. It is located in. As a result, the bias of the spring characteristics in the circumferential direction due to the presence of a portion having a small radial dimension in the connected rubber elastic body 48 is suppressed, and as described later, the integral vulcanization of the connected rubber elastic body 48 is performed. The axial displacement of the partition member main body 46 in a state where the molded product is assembled to the orifice member 44 is stably generated.

  In the integrally vulcanized molded product of the connecting rubber elastic body 48 having such a structure, the metal sleeve 66 is press-fitted into the inner hole 50 formed in the orifice member 44, and the metal sleeve 66 is press-fitted and fixed to the orifice member 44. Thus, the orifice member 44 is assembled. Thereby, the partition member main body 46 and the orifice member 44 are connected by the connecting rubber elastic body 48. As is clear from this, in the present embodiment, the inner hole 50 constitutes a press-fitting hole.

  Further, as described above, the partition member main body 46 and the orifice member 44 are connected by the connecting rubber elastic body 48, so that the partition member main body 46 can be displaced in the vertical direction with respect to the orifice member 44. The elastic body 48 is elastically supported. Thus, one vibration system is configured in which the partition member body 46 is a mass and the connecting rubber elastic body 48 is a spring. The resonance frequency of the vibration system is tuned to a frequency different from the natural frequency of the body to which the second mounting bracket 14 is attached (in this embodiment, approximately 600 Hz). The frequency is lower than the natural frequency of the body (approximately 400 Hz). The tuning of the resonance frequency of the vibration system constituted by the partition member main body 46 and the connecting rubber elastic body 48 can be performed by changing the forming material or size of the partition member main body 46, This is advantageously realized by changing the size, shape, etc.

  Furthermore, in the present embodiment, since the inner hole 50 is formed at a position shifted outward from the central axis of the orifice member 44 in the direction perpendicular to the axis, the metal sleeve 66 is press-fitted into the inner hole 50. The integrally vulcanized molded product of the connecting rubber elastic body 48 assembled to the orifice member 44 is also at a position shifted outward from the central axis of the orifice member 44 in the direction perpendicular to the axis. Accordingly, in the present embodiment, the partition member main body 46 is displaced by the connecting rubber elastic body 48 in the vertical direction at a position displaced from the central axis of the orifice member 44 in the direction perpendicular to the axis. It is elastically supported.

  Further, the metal sleeve 66 press-fitted into the inner hole 50 is positioned on the stepped surface 68 formed in the vicinity of the lower opening of the inner hole 50, thereby positioning in the axial direction. When the metal sleeve 66 is positioned in the axial direction with respect to the orifice member 44, the partition member main body 46, the connecting rubber elastic body 48, and the orifice member 44 spread in a direction perpendicular to the central axis of the orifice member 44. It is located in. In particular, in the present embodiment, the upper surface of the orifice member 44 and the upper surface of the main body fitting 52 are positioned on substantially the same axis-perpendicular plane.

  The partition member 42 having such a structure is fitted into the fitting cylinder portion 24 of the second mounting bracket 14 so as to spread in the direction perpendicular to the axis. Then, the upper surface and the outer peripheral surface of the orifice member 44 positioned on the outer peripheral portion of the partition member 42 are fluidized with respect to the rubber fixing portion 22 and the fitting cylinder portion 24 of the second mounting bracket 14 via the seal rubber layer 30. It is closely stacked. Thereby, the orifice member 44 in the partition member 42 is fixedly supported by the second mounting member 14. In this state, when the partition member 42 is fitted into the fitting cylinder portion 24 of the second mounting bracket 14, the outer peripheral portion of the partition member 42, that is, the orifice member 44 is It is in contact with the support portion 36.

  Furthermore, the partition member 42 is fixedly supported by the second mounting bracket 14 as described above, so that the partition member 42 is disposed so as to spread in the direction perpendicular to the axis inside the fluid sealing region. Thereby, the fluid enclosure region is divided into two parts up and down, and on the one side in the axial direction (the upper side in FIG. 1) sandwiching the partition member 42, a part of the wall part is constituted by the main rubber elastic body 16. On the other hand, a pressure receiving chamber 70 is formed in which pressure fluctuation is caused by elastic deformation of the main rubber elastic body 16 when vibration is input between the first mounting bracket 12 and the second mounting bracket 14. On the other side in the axial direction across 42 (the lower side in FIG. 1), a part of the wall portion is constituted by a diaphragm 32, and volume change is easily allowed based on elastic deformation of the diaphragm 32. An equilibrium chamber 72 is formed.

  Further, the orifice member 44 constituting the partition member 42 is formed with a concave groove 74 that is open on the upper surface and extends continuously in the circumferential direction. The concave groove 74 is fixed to the rubber of the second mounting bracket 14. The portion 22 is covered with a fluid tight cover. Thereby, a tunnel-shaped passage exists in the outer peripheral portion of the partition member 42. In the present embodiment, the concave groove 74 is formed with a length that substantially makes one round of the outer peripheral portion of the partition member 42.

  Further, one end portion of the concave groove 74 extends radially inward from the inner peripheral edge portion of the rubber fixing portion 22 of the second mounting bracket 14, so that the inner end portion is closer to the inner side than the rubber fixing portion 22. A communication hole 76 is formed by opening the end of the groove 74 on the upper surface of the orifice member 44 on the circumferential side. Then, one end portion of the concave groove 74 is opened and connected to the pressure receiving chamber 70 through the communication hole 76. Further, the other end of the groove 74 is connected to the equilibrium chamber 72 through a communication hole 78 formed in the bottom wall portion of the groove 74 in the orifice member 44. Thus, an orifice passage 80 is formed by using the concave groove 74 of the orifice member 44, and the pressure receiving chamber 70 and the equilibrium chamber 72 are communicated with each other through the orifice passage 80. The orifice passage 80 is always maintained in a communication state in which the pressure receiving chamber 70 and the equilibrium chamber 72 are communicated.

  At the time of vibration input, relative pressure fluctuation is induced between the pressure receiving chamber 70 in which pressure fluctuation is caused and the equilibrium chamber 72 in which volume change is allowed based on deformation of the diaphragm 32. A fluid flow through the orifice passage 80 is generated between the two chambers 70 and 72. As a result, the anti-vibration effect based on the resonance action of the fluid that flows between the pressure receiving chamber 70 and the equilibrium chamber 72 through the orifice passage 80 has an anti-vibration effect in the axial direction (vertical direction in FIG. 1). It has come to be demonstrated.

  In particular, in the present embodiment, the resonance frequency of the fluid that is allowed to flow through the orifice passage 80 exhibits an effective anti-vibration effect against low-frequency large-amplitude vibrations around 10 Hz such as a shake based on the resonance action of the fluid. Is tuned to be. The tuning of the resonance frequency is realized by changing the setting of the passage cross-sectional area and the passage length of the orifice passage 80, for example.

  A movable rubber plate 82 as a movable plate is accommodated in the accommodation space 60 provided in the partition member main body 46. The movable rubber plate 82 has a substantially disc shape as a whole and is integrally formed of a rubber material. As described above, the movable rubber plate 82 has the maximum thickness dimension T that is smaller than the height dimension L of the accommodation space 60, and the movable rubber plate 82 is positioned in the center of the accommodation space 60. Under the state, a gap that extends over the entire circumference of the movable rubber plate 82 is formed between the inner surface of the accommodation space 60 (see FIG. 7). The movable rubber plate 82 is allowed to be freely displaced in the accommodation space 60 by a stroke corresponding to the size of the gap.

  In addition, the lid plate metal member 54 that is opposed to the movable rubber plate 82 in the plate thickness direction and forms the upper and lower wall portions of the storage space 60 and the bottom wall 84 of the storage recess 56 in the main body metal member 52 are axially arranged. Through holes 86 and 88 penetrating in the vertical direction are formed. As a result, the storage space 60 is connected to the pressure receiving chamber 70 through a through hole 86 penetrating the lid plate 54, and connected to the equilibrium chamber 72 through a through hole 88 penetrating the bottom wall 84. Yes. As a result, the upper surface of the movable rubber plate 82 accommodated in the accommodation space 60 is exposed to the pressure receiving chamber 70 through the through hole 86 penetrating the lid plate metal 54, while the lower surface of the movable rubber plate 82 is It is exposed to the equilibrium chamber 72 through a through-hole 88 penetrating the bottom wall 84 of the housing recess 56. The through holes 86 and 88 are opened over substantially the entire upper and lower inner surfaces 62 and 64 of the accommodation space 60, and in particular, a later described central flat plate portion 90 located at the central portion of the movable rubber plate 82. And an outer peripheral annular portion 92 (described later) located in the outer peripheral portion.

  Accordingly, the movable rubber plate 82 is configured so that the internal pressures of the pressure receiving chamber 70 and the equilibrium chamber 72 are exerted on the upper surface and the lower surface, and the movable rubber is based on the pressure difference between the pressure receiving chamber 70 and the equilibrium chamber 72 when vibration is input. A displacement in the plate thickness direction is generated with respect to the plate 82. That is, in the present embodiment, the lid plate metal 54 and the bottom wall 84 constitute a pair of wall portions facing each other in the movable direction of the movable plate, and are formed on the lid plate metal 54 and the bottom wall 84, respectively. The through holes 86 and 88 constitute a through hole. Then, based on the displacement of the movable rubber plate 82 in the axial direction, fluid flow through the through holes 86 and 88 of the cover plate metal 54 and the main body metal 52 is generated, so that the resonance action or pressure receiving chamber 70 of the fluid is generated. The hydraulic pressure absorbing action based on releasing the pressure fluctuation to the equilibrium chamber 72 is exerted, and the low dynamic spring effect with respect to the input vibration is exhibited.

  Note that the allowable stroke in the vertical direction (plate thickness direction) within the accommodation space 60 of the movable rubber plate 82 is the amplitude of vibration to be vibrated, the effective piston diameter in the pressure receiving chamber 70 of the engine mount 10, the movable rubber plate. It is adjusted appropriately depending on the size of 82 and the like. In this embodiment, when an amplitude vibration of ± 0.5 to 2.0 mm corresponding to the engine shake is applied between the first mounting bracket 12 and the second mounting bracket 14, the movable rubber plate 82 is moved. The movable rubber plate 82 is in contact with the inner surfaces 62 and 64 of the accommodation space 60, but when a medium or small amplitude vibration of ± 0.25 mm or less corresponding to idling vibration or traveling noise is input, the movable rubber plate 82 is in contact with the inner surfaces 62 and 64 of the accommodation space 60. The size of the gap between the opposed surfaces of the upper and lower surfaces of the movable rubber plate 82 and the upper and lower inner surfaces 62 and 64 of the accommodation space 60 is set so that the displacement is allowed in a region not in contact with the upper and lower surfaces.

  6 to 8, the movable rubber plate 82 of the present embodiment is continuous in the circumferential direction at the circular flat plate-shaped central flat plate portion 90 as the flat plate portion and the outer peripheral edge portion. And has an annular plate-shaped outer peripheral annular portion 92 extending in the shape of an annular plate.

  The central flat plate-like portion 90 extends in a circular shape with a substantially constant thickness on the central axis, and a plurality of buffer lip protrusions are integrally formed on both the upper and lower surfaces thereof. Such buffer lip protrusions are (a) an annular first buffer lip protrusion 94 continuously extending in the circumferential direction in the radial direction, and (b) radially outward from near the central axis. Eight independent second buffer lip protrusions 96 and (c) an annular third buffer lip protrusion 98 extending continuously in the circumferential direction on the outer peripheral edge portion.

  The outer peripheral annular portion 92 has an inner diameter dimension larger than the outer diameter dimension of the central flat plate portion 90 and is positioned on the same central axis as the central flat plate portion 90. In the substantially central portion in the plate thickness direction, the outer peripheral surface of the central flat plate-like portion 90 and the inner peripheral surface of the outer peripheral annular portion 92 are integrated with each other by a thin connecting portion 100 extending in the opposing radial direction. It is connected. In other words, the movable rubber plate 82 of the present embodiment has a pair of annular concave grooves that continuously extend in the circumferential direction at portions on the upper and lower surfaces that are separated from the outer peripheral edge by a predetermined distance radially inward. The inner peripheral side is a central flat plate-like portion 90 with the connecting portion 100 thinned by the peripheral portions 102, 102 interposed therebetween, and the outer peripheral side is an outer annular portion. 92.

  In addition, on the upper and lower surfaces of the outer peripheral annular portion 92, there are annular fourth buffer lip protrusions 104 and fifth buffer lip protrusions 106 extending continuously in the circumferential direction at the inner peripheral edge portion and the outer peripheral edge portion, respectively. It is integrally formed.

  Further, the outer circumferential annular portion 92 has a wall thickness dimension (including upper and lower buffer lip protrusions) smaller than a wall thickness dimension (including upper and lower buffer lip protrusions) of the central flat plate-shaped portion 90. And this outer periphery annular part 92 is made into the wave-like part curvedly formed as a whole so that it might wave in the plate | board thickness direction (up-down direction in FIG. 7, 8) in the circumferential direction. That is, the outer peripheral annular portion 92 is changed such that the center position in the thickness direction swings up and down in the circumferential direction without substantially changing the shape or size of the radial cross section (longitudinal cross section). . In particular, in the present embodiment, as shown in FIG. 8, the center line and the upper and lower surfaces of the outer peripheral annular portion 92 have a substantially sinusoidal wave shape in the circumferential direction with a constant cycle, and one cycle thereof. Is 90 degrees in the circumferential direction, and the upper and lower surfaces are generally smooth curved surfaces.

  Moreover, in this embodiment, the outer periphery annular part 92 is gradually thinned as it goes to the outer periphery side, and both the upper and lower surfaces are radially inclined surfaces having substantially the same angle. And since the connection part 100 is made thin, when the outer ring part 92 is deformed and displaced in a swinging manner with the connection part 100 as a fulcrum, only the outer periphery part does not come into contact with the inner periphery. They are in contact with each other or are in contact with each other at substantially the same time. As a result, in the region until the outer peripheral annular portion 92 abuts against the inner surfaces 62 and 64 of the accommodation space 60, it can be displaced within a swing angle range as large as possible.

  Furthermore, in the present embodiment, the inner peripheral edge of the lower surface of the outer ring part 92 is the central flat plate at the position (the left and right end positions in FIG. 8) that is the lowest end (bottom dead center) in the outer ring part 92. It can be positioned on the same plane as the lower surface of the shaped portion 90. Further, the inner peripheral edge portion of the upper surface of the outer peripheral annular portion 92 is substantially the same as the upper surface of the central flat plate-like portion 90 at a position (center position in FIG. 8) which is the uppermost end (top dead center) in the outer peripheral annular portion 92. They can be positioned on the same plane.

  The first to third buffer lip protrusions 94, 96, and 98 projecting from the central plate-shaped portion 90, and the fourth and fifth buffer lip protrusions 104 and 106 projecting from the outer annular portion 92. The projecting heights of are substantially the same.

  Therefore, considering the state in which the movable rubber plate 82 is not elastically deformed by an external force, the first to third buffering lip protrusions 94 projecting from the lower surface of the central plate-like portion 90 on the lower surface thereof. , 96, 98 and the fourth buffering lip protrusion 104 projecting from the lower surface of the outer peripheral annular portion 92 are positioned at the lowest end (bottom dead center) (right and left end positions in FIG. 8). The projecting front end portion is positioned on the same plane perpendicular to the axis. Further, on the upper surface, the protruding tip portions of the first to third buffering lip protrusions 94, 96, 98 protruding from the upper surface of the central flat plate-shaped portion 90 and the upper surface of the outer peripheral annular portion 92 are projected. The protruding tip at the position (center position in FIG. 8) that is the uppermost end (top dead center) of the fourth buffer lip protrusion 104 is positioned on the same axis perpendicular plane.

  Accordingly, when the movable rubber plate 82 is largely displaced in the axial direction (vertical direction) within the accommodation space 60, the movable rubber plate 82 (the projecting tip portions of the first to third buffering lip protrusions 94, 96, 98, and the fourth The protruding tip portion at a specific position on the circumference of the buffer lip protrusion 104 is brought into contact with the lower surface 64 and the upper surface 62 of the accommodation space 60 substantially simultaneously.

  In the present embodiment, the thickness of the outer circumferential annular portion 92 is made thinner as it goes to the outer circumferential side, and the outer circumferential annular portion 92 is curved upward and downward in the shape of a corrugated plate in the circumferential direction. Therefore, the fifth buffering lip protrusion 106 projecting from the outer peripheral edge of the outer peripheral annular portion 92 is positioned on the lower surface at the top dead center and on the upper surface at the bottom dead center. In any of the portions, there is almost no contact with the inner surfaces 62 and 64 of the accommodation space 60. Therefore, in the present embodiment, the fifth buffering lip protrusions 106 and 106 protrude from both the portion located on the lower surface at the top dead center and the portion located on the upper surface at the bottom dead center of the outer peripheral annular portion 92. The height is reduced to reduce weight and reduce rubber materials.

  In the engine mount 10 of the present embodiment having the above-described structure, when vibration in a substantially axial direction is input between the first mounting bracket 12 and the second mounting bracket 14 in the mounted state on the automobile. If it is a small amplitude vibration in the middle to high frequency range corresponding to idling vibration of about ± 0.1 to 0.25 mm or traveling noise of about ± 0.01 to 0.05 mm, a movable rubber plate The hydraulic pressure absorption action based on the displacement of 82 is exhibited. That is, at the time of inputting such small amplitude vibration in the middle to high frequency range, the movable rubber plate 82 is substantially within the movable range allowed by the gap provided between the inner surfaces 62 and 64 of the accommodation space 60. Based on being maintained in a floating state and freely displaced up and down, substantial fluid flow between the pressure receiving chamber 70 and the equilibrium chamber 72 through the through hole 86.88 is allowed through the receiving space 60. As a result, the pressure fluctuation in the pressure receiving chamber 70 is released to the equilibrium chamber 72. As a result, a significant increase in the dynamic spring due to clogging as an anti-resonance phenomenon of the orifice passage 80 is avoided, and good vibration isolation performance is exhibited.

  On the other hand, when the vibration input between the first mounting bracket 12 and the second mounting bracket 14 has a relatively large amplitude in the low frequency range, for example, a normal travel shake of ± 0.5 to 1.0 mm. In the case of a shake at the time of overcoming a step of about ± 1.0 to 2.0 mm, the displacement end of the central disk-shaped portion 90 of the movable rubber plate 82 is directed to the inner surfaces 62 and 64 of the accommodation space 60. Regulated by the contact, the pressure fluctuation in the pressure receiving chamber 70 cannot be absorbed by the displacement of the movable rubber plate 82. That is, the upper and lower surfaces of the movable rubber plate 82 (central disc-shaped portion 90) repeatedly abut (hit) against the upper and lower inner surfaces 62, 64 of the accommodation space 60. When the movable rubber plate 82 hits the upper and lower inner surfaces 62, 64 of the accommodation space 60 in this way, the through holes 86, 88 formed therein are narrowed or substantially closed by the movable rubber plate 82. It will be. As a result, a relative pressure fluctuation is effectively induced between the pressure receiving chamber 70 and the equilibrium chamber 72, and a fluid flow through the orifice passage 80 is generated based on the relative pressure fluctuation. . As a result, the desired vibration isolation effect based on the resonance action of the fluid flowing through the orifice passage 80 is exhibited.

  Therefore, in this embodiment, since the partition member main body 46 provided with the accommodation space 60 in which the movable rubber plate 82 is accommodated is elastically supported by the connecting rubber elastic body 48, the movable rubber plate 82 is accommodated in the accommodation space. When vibration is induced in the partition member main body 46 due to an impact when hitting the inner surfaces 62 and 64 of the 60, the connecting rubber elastic body 48 elastically supporting the partition member main body 46 is elastically deformed, whereby the partition member The vibration of the main body 46 is reduced or absorbed.

  Therefore, the engine mount 10 according to the present embodiment suppresses the transmission of the vibration induced in the partition member body 46 to the second mounting member 14 by using the vibration reduction or absorption action by the connecting rubber elastic body 48. It becomes possible. As a result, vibrations in a frequency range that cannot be heard when transmitted through the air are transmitted to the second mounting bracket 14 and further amplified by the body to avoid being recognized as abnormal noise. As a result, the vibration isolation performance of the engine mount 10 can be further improved.

  In particular, in the present embodiment, when the movable rubber plate 82 contacts the lower inner surface 64 of the accommodation space 60, the lower surface of the bottom dead center on the periphery curved in the outer peripheral annular portion 92 so as to wave up and down. Only abut first at a total of four locations on the circumference. Thereafter, when the hydraulic pressure acting on the movable rubber plate 82 from the upper surface gradually increases, the outer peripheral annular portion 92 is gradually elastically deformed by an external force (pressure) that increases in addition to the kinetic energy at the time of contact. The contact area gradually increases from the desired contact position on the lower surface of the bottom dead center on the circumference toward both sides in the circumferential direction.

  Similarly, when the outer peripheral annular portion 92 of the movable rubber plate 82 contacts the upper inner surface 62 of the accommodation space 60, similarly, the upper surface of the top dead center on the periphery of the outer peripheral annular portion 92 first contacts, Thereafter, as the amount of elastic deformation of the outer peripheral annular portion 92 increases, the contact surface gradually spreads on both sides in the circumferential direction, increasing the contact area. That is, the outer peripheral annular portion 92 strikes against the inner surfaces 62 and 64 of the accommodation space 60 even in portions other than the center of the convex portions on the upper and lower surfaces.

  By causing such a contact state, when the movable rubber plate 82 is in contact, the contact of the movable rubber plate 82 is based on the damping action accompanying the elastic deformation of the outer circumferential annular portion 92 or the absorption action of the contact energy. The impact at the time of contact is effectively reduced. As a result, it is possible to reduce or absorb the impact itself that causes vibration to the partition member main body 46, and as a result, it is caused by the contact of the movable rubber plate 82 against the inner surfaces 62 and 64 of the accommodation space 60. It is possible to further suppress the occurrence of abnormal noise.

  In particular, in this embodiment, a small impact when the movable rubber plate 82 contacts the inner surfaces 62 and 64 of the accommodation space 60 is caused by elastic deformation of the first to fifth buffering lip protrusions 94, 96, 98, 104, and 106. As a result, it is possible to exhibit a more effective impact mitigating effect.

  Furthermore, in this embodiment, not only the small buffer lip protrusion but also the elastic deformation of the movable rubber plate 82 main body having a predetermined thickness is used to contact the inner surfaces 62 and 64 of the accommodation space 60 of the movable rubber plate 82. Since the energy absorbing action is exerted, it is possible to effectively absorb and reduce the impact at the time of large contact.

  In addition, in the present embodiment, shock absorption at the time of contact is made at the outer peripheral edge portion (outer peripheral annular portion 92) of the movable rubber plate 82 where the displacement speed at the time of hitting is most likely to be maximum because it is a free displacement end. Since the wave-like portion that exhibits the action is formed, it is possible to more effectively exhibit the impact absorbing effect at the time of contact by the wave-like portion.

  In addition, in the present embodiment, the thin connecting portion 100 is formed near the outer peripheral edge of the movable rubber plate 82, and the outer peripheral annular portion 92 is configured to be deformable and displaceable to some extent independently from the central flat plate portion 90. Thus, the displacement and elastic deformation in the outer annular portion 92 are avoided from being unnecessarily restrained by the central flat plate-like portion 90, and the elastic deformation at the time of contact of the outer annular portion 92 advantageously occurs. It can be tightened. Therefore, the impact absorbing effect at the time of contact as described above accompanying elastic deformation of the outer peripheral annular portion 92 can be more effectively exhibited.

  Further, by forming the wave-like portion (outer peripheral ring portion 92) on the outer peripheral portion of the movable rubber plate 82, it becomes possible to advantageously ensure the balance of the overall elasticity and rigidity of the movable rubber plate 82.

  Furthermore, in this embodiment, the resonance frequency of the vibration system constituted by the partition member main body 46 and the connecting rubber elastic body 48 is tuned so as to remove the natural frequency of the vehicle body to which the second mounting bracket 14 is attached. Therefore, the resonance phenomenon of the vibration system does not become a problem.

  Furthermore, in the present embodiment, the partition member main body 46 is elastically supported by the connecting rubber elastic body 48 with respect to the orifice member 44 at a position shifted outward from the central axis of the orifice member 44 in the direction perpendicular to the axis. Then, one end of the concave groove 74 extends radially inward from the inner peripheral edge of the rubber fixing portion 22 of the second mounting bracket 14, and on the inner peripheral side of the rubber fixing portion 22. It becomes possible to open the end of the concave groove 74 on the upper surface of the orifice member 44. Accordingly, it is not necessary to increase the axial dimension of the orifice member 44 and to form the communication hole to the pressure receiving chamber 70 side of the orifice passage 80 so as to open radially inward. As a result, the orifice member The axial dimension (thickness dimension) 44 can be reduced. Accordingly, the axial size of the engine mount 10 can be reduced. In addition, it is possible to ensure the size of the partition member body 46, thereby ensuring the degree of freedom in tuning the resonance frequency of the vibration system constituted by the partition member body 46 and the connecting rubber elastic body 48. Become.

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

  For example, in the above-described embodiment, the plate thickness dimension of the central flat plate-shaped portion 90 and the separation dimension (swelling height) in the plate thickness direction between the convex portion on the upper surface side and the convex portion on the lower surface side in the outer peripheral annular portion 92. The dimension is set to be substantially the same so that when the movable rubber plate 82 is displaced in the axial direction and abuts against the inner surfaces 62 and 64 of the accommodation space 60, the central flat plate portion 90 and the outer annular portion 92, the upper and lower dead centers of the upper and lower surfaces of the outer peripheral annular portion 92, which is a wave-shaped portion, are shown in FIG. Further, it may be projected outward in the thickness direction. In this way, the outer peripheral annular portion 92 comes into contact with the inner surfaces 62 and 64 of the accommodating space 60 prior to the central flat plate-like portion 90, and the impact absorbing effect due to the elastic deformation of the outer peripheral annular portion 92 is further increased. It becomes possible to demonstrate effectively. Alternatively, as shown in FIG. 10, only on one surface of the upper and lower surfaces of the movable rubber plate 82, the outer peripheral annular portion 92, which is a wave-shaped portion, is formed with respect to the inner surface (the lower surface 64 or the upper surface 62). It may be configured to come into contact with each other. As a result, it is possible to effectively exhibit the effect of absorbing the shock accompanying the contact with at least one surface. 9 and 10 are side views schematically showing the outer peripheral surface of the movable rubber plate 82 as viewed from the outside in the direction perpendicular to the axis. For ease of understanding, members and parts having the same structure as in the above embodiment are denoted by the same reference numerals as in the above embodiment.

  Further, the wavy portion is not limited to the one in which the wavy unevenness is continuously formed in the circumferential direction as in the above-described embodiment, and for example, the wavy portion is continuously formed in one direction or movable. It is possible to employ various modes such as those in which wavy unevenness is formed by being divided into a plurality of regions of the rubber plate. Furthermore, in the said embodiment, although the wave-like part in a movable rubber plate was formed in the outer periphery part, it is also possible to comprise substantially the whole movable rubber plate as a wave-like part, for example. Furthermore, when forming a wave-like part in the outer periphery part of the movable rubber plate 82, the thin connection part 100 is not necessarily required. In addition, as for the wavy part, its shape, pitch, size of unevenness, etc. are effective according to the thickness of the wavy part (plate thickness dimension of the movable rubber plate), the material, the magnitude of the applied hydraulic pressure, etc. It is set as appropriate so that a good contact shock absorbing effect is exhibited. Therefore, in order to obtain an effective abutting impact absorbing effect, as a specific shape of the wavy unevenness, for example, a curve that does not have a sinusoidal angular portion than an uneven shape in which sawtooth-shaped corner portions are connected by a straight line. The uneven shape is preferably employed. Moreover, it is desirable that the thickness dimension of the wavy portion (in the case where the wavy portion has the buffer lip protrusion), the thickness dimension including the buffer lip protrusion is 2 mm to 15 mm. Note that the movable rubber plate including the wavy portion does not necessarily have a constant thickness dimension. Furthermore, it is preferable that the number of pitches of the undulations of the wavy portion: P is more preferably two or more cycles, in order to obtain a stable contact state with the inner surface of the accommodation space and an effective shock absorbing function. The distance between adjacent convex portions and convex portions or concave portions and concave portions: PL is set to 10 mm ≦ PL ≦ 50 mm. Furthermore, it is desirable that the depth of the undulations of the wavy portion: D (the separation distance in the thickness direction between the tip of the convex portion and the bottom of the concave portion) be 0.1 mm or more, and more preferably 0.2 mm ≦ D ≦ 1 mm.

  In the embodiment, the buffer lip protrusions (first to third buffer lip protrusions 94, 96, 98) are integrally formed on both sides in the thickness direction of the flat plate portion (central flat plate portion 90). In addition, there is a gap between the pair of opposed inner surfaces 62 and 64 in the accommodation space 60 and the buffer lip protrusions (first to third buffer lip protrusions 94, 96, 98) on both sides in the thickness direction of the movable rubber plate 82. The flat plate portion (center flat plate portion 90) can be freely displaced in the plate thickness direction by a predetermined amount within the storage space 60. For example, the flat plate portion can be paired with a pair of opposing spaces in the storage space. The inner surface of the buffer lip protrusion is sandwiched in a state where it is elastically deformed by a predetermined amount, and the flat plate portion is substantially displaced in the thickness direction within the accommodation space based on the elastic deformation of the buffer lip protrusion. like In Rukoto, shock effectively absorbed due to the striking of the housing space inside surface of the flat portion, may be reduced.

  In the above-described embodiment, the buffer lip protrusions 94, 96, 98, 104, and 106 are integrally formed on both surfaces of the movable rubber plate 82. However, these buffer lip protrusions are not always necessary, and as illustrated. In addition to the protrusion-shaped buffer lip protrusions that continuously extend in the circumferential direction or the direction perpendicular to the axis, it is also possible to adopt a number of independent buffer-shaped protrusion lip protrusions.

  In the above embodiment, the movable rubber plate 82 has a structure in which the outer peripheral annular portion 92 is provided outside the central flat plate-like portion 90. However, a circular flat plate-like movable rubber plate can also be adopted. It is.

  Furthermore, the specific shape of the main rubber elastic body 16 and the specific structure and shape of the orifice passage 80 are appropriately changed in consideration of the vibration-proof characteristics required for the mount and the space for installation. Of course, the present invention is not limited to the above embodiment.

  Furthermore, the resonance frequency of the vibration system constituted by the partition member main body 46 and the connecting rubber elastic body 48 is not limited to that of the above embodiment.

  Further, it is possible to configure a hydraulic pressure absorption mechanism of the pressure receiving chamber at the time of vibration input in a high frequency region by utilizing the resonance of the vibration system formed by the partition member main body 46 and the connecting rubber elastic body 48. Thus, for example, it is possible to improve the passive vibration isolation performance of the engine mount against acceleration noise.

  In addition, in the above-described embodiments, specific examples of the present invention applied to an engine mount for automobiles have been described. However, the present invention is applicable to vibration isolation of various vibrators other than automobiles in addition to automobile body mounts and differential mounts. Needless to say, any of them can be applied to the mount.

  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.

1 is a longitudinal sectional view showing an automobile engine mount as one embodiment of the present invention. It is a top view which shows the partition member which comprises the engine mount shown by FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2, illustrating a state where a movable rubber plate is accommodated and disposed. FIG. 3 is a bottom view of the partition member main body shown in FIG. 2. It is principal part sectional drawing of the VV direction in FIG. 2, Comprising: It is sectional drawing which shows the state by which the movable rubber plate was accommodated. It is a top view which shows the movable rubber plate which comprises the engine mount shown by FIG. It is VII-VII sectional drawing in FIG. FIG. 8 is a development view over a quarter circumference of the outer peripheral surface of the movable rubber plate shown in FIG. 7. FIG. 9 is a developed view of the outer peripheral surface corresponding to FIG. 8 for describing another structural example of the movable rubber plate that can be employed in the engine mount shown in FIG. 1. FIG. 6 is a developed view of the outer peripheral surface for explaining still another structural example of the movable rubber plate that can be employed in the engine mount shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine mount 12 1st attachment metal fitting 14 2nd attachment metal fitting 16 Main body rubber elastic body 32 Diaphragm 42 Partition member 44 Orifice member 46 Partition member main body 48 Connection rubber elastic body 54 Cover plate metal fitting 60 Accommodating space 70 Pressure receiving chamber 72 Equilibrium chamber 80 Orifice passage 82 Movable rubber plate 84 Bottom wall 86 Through hole 88 Through hole

Claims (10)

A first attachment member attached to one member to be vibration-proof connected and a second attachment member attached to the other member to be anti-vibration connected are connected by a main rubber elastic body, and the wall portion is formed by the main rubber elastic body. The second mounting member includes a pressure receiving chamber in which a part of the pressure receiving chamber is configured to cause pressure fluctuation when vibration is input, and an equilibrium chamber in which a part of the wall is configured by a flexible film and volume change is allowed. Formed on both sides of the partition member supported by the pressure chamber, enclosing an incompressible fluid in the pressure receiving chamber and the equilibrium chamber, and providing an orifice passage for communicating the pressure receiving chamber and the equilibrium chamber with each other, The movable plate is accommodated in the accommodating space provided in the partition member, and through holes are formed to connect the accommodating space to the pressure receiving chamber and the equilibrium chamber, respectively. Through the through holes, one side of the movable plate is formed. The pressure in the pressure receiving chamber is exerted and the other surface is As pressure 衡室 is exerted, the fluid filled type vibration damping device designed to absorb escape to the equilibrium chamber through the movable plate a small pressure fluctuations in the receiving chamber during input of vibration,
The partition member is fixedly supported by the second mounting member, and an annular orifice member, and a partition member main body disposed on the inner peripheral side of the orifice member, the orifice member and the partition member main body The housing is configured to be connected by a connecting rubber elastic body disposed therebetween, and the orifice passage is constituted by the orifice member, while the movable plate is housed and arranged with respect to the partition member main body. A space is provided, and the through hole is formed in each of the pair of wall portions opposed to each other in the movable direction of the movable plate among the wall portions defining the accommodation space in the partition member body, The fluid filled type vibration damping device, wherein the storage space is connected to the pressure receiving chamber and the equilibrium chamber, respectively.   The resonance frequency of the vibration system constituted by the partition member main body and the connecting rubber elastic body is tuned to a frequency different from the natural frequency of the other member to be vibrated, to which the second attachment member is attached. The fluid-filled vibration isolator according to claim 1.   The connecting rubber elastic body is disposed between the partition member main body and a metal sleeve disposed on the outer peripheral side of the partition member main body, and the connecting rubber elastic body is bonded to the partition member main body and the metal sleeve. On the other hand, the orifice member has a structure having a press-fitting hole into which the metal sleeve is press-fitted, and the metal sleeve is press-fitted and fixed to the orifice member, whereby the partition member main body and the orifice member are elastic to the connecting rubber. The fluid-filled vibration isolator according to claim 1 or 2, wherein the fluid-filled vibration isolator is connected by a body.   The inner hole of the orifice member is formed at a position shifted in a direction perpendicular to the central axis of the orifice member, so that the partition member body is perpendicular to the central axis of the orifice member. The fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the fluid-filled vibration isolator is disposed on an inner peripheral side of the orifice member at a shifted position.   5. The movable rubber plate formed of a rubber elastic body constitutes the movable plate, and at least a part of the movable plate is a wave-like portion that spreads in a substantially corrugated shape with continuous irregularities. The fluid-filled vibration isolator described in 1.   The fluid-filled vibration isolator according to claim 5, wherein the wave-like portion has a buffer lip protrusion formed integrally on a surface contacting the inner surface of the accommodation space.   A central portion of the movable rubber plate is a circular flat plate-like portion, and an outer peripheral portion of the movable rubber plate is formed in an annular plate shape that undulates in the circumferential direction over the entire circumference to constitute the wavy portion. The fluid-filled vibration isolator according to claim 5 or 6.   The movable rubber plate is accommodated and disposed so as to be minutely displaceable with a predetermined amount of gap in the thickness direction with respect to the accommodation space over the entire space, and the movable rubber plate is displaced to accommodate the accommodation space. The at least one surface of the movable rubber plate is in contact with the inner surface of the housing space so that the corrugated portion first contacts the inner surface of the housing space. Fluid-filled vibration isolator.   The waviness height dimension in the plate thickness direction between the convex portion on one surface side and the convex portion on the other surface side in the wavy portion of the movable rubber plate is smaller than the distance between the opposing inner surfaces of the accommodation space. Accordingly, the corrugated portion of the movable rubber plate is accommodated and disposed with a predetermined gap in the thickness direction with respect to the inner surface of the accommodating space, and the corrugated portion is displaced in the thickness direction. The fluid filled type vibration damping device according to any one of claims 5 to 8, wherein the fluid filled type vibration damping device is adapted to abut against an inner surface of the accommodation space. The second mounting member has a substantially cylindrical shape, and the first mounting member and the second mounting member are separated from each other on one opening side of the second mounting member. The main rubber elastic body to be coupled covers one opening of the second mounting member fluid-tightly, and the other opening of the second mounting member is fluid-tightly covered by the flexible film. On the other hand, the orifice member of the partition member is fixedly supported by the second mounting member, and the partition member is fixed between the opposing surface of the main rubber elastic body and the flexible film. The pressure receiving chambers and the equilibrium chambers are formed on both sides of the partition member so as to extend in a direction perpendicular to the axis of the partition member, and the second attachment is provided inside the partition member main body of the partition member. The accommodating space extends in a direction perpendicular to the axis of the member. The fluid-filled vibration isolator according to claim 1, wherein the movable plate is accommodated and disposed so as to spread in a direction perpendicular to the axis of the second mounting member with respect to the accommodation space. .

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