JP2005273791A - Active type fluid encapsulated vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an active type fluid encapsulated vibration isolator having an improved structure capable of enhancing the durability of a flexible film and a solenoid type actuator by reducing the deterioration of the flexible film due to heat transfer from the solenoid type actuator. <P>SOLUTION: A driving rod 94 having a projection 128 rising toward the flexible film 36 and transmitting the driving force of the solenoid type actuator 106 to a vibratory exciting member 56 is inserted into the center hole 130 of a heat insulator 126, which is located between the mutually confronting surfaces of the flexible film 36 and the solenoid type actuator 106, and also a cylindrical seal piece 136 is formed in a single piece structure stretching out from approximately the center of the film 36 toward the heat insulator 126, whereto the forefront of the seal piece 136 is abutted, and the center hole 130 of the heat insulator 126 is covered with lid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is employed in, for example, an automobile engine mount, body mount, vibration control device, or the like, and can exhibit an active or counterbalanced vibration isolation effect against the vibration to be isolated. In particular, a part of the wall of the vibration action chamber in which the incompressible fluid is sealed is constituted by a vibration member, and the vibration member is driven by an electromagnetic actuator to control the pressure of the vibration action chamber. The present invention relates to an active fluid-filled vibration isolator that can obtain an active vibration isolating effect.

  As a type of anti-vibration coupling body and anti-vibration device as an anti-vibration support body interposed between members constituting the vibration transmission system, the first mounting member and the second mounting member are coupled by a main rubber elastic body. In addition, a part of the wall portion is formed of the main rubber elastic body to form a vibration action chamber into which vibration is input, and an incompressible fluid is sealed in the vibration action chamber, while the wall portion of the vibration action chamber is Another part is composed of a vibration member, and an actuator for driving the vibration member is provided, and the vibration working chamber is pressure controlled by exciting the vibration member. An active vibration isolator is known. For example, the anti-vibration device described in Patent Literature 1, Patent Literature 2, and the like. Such an active fluid-filled vibration isolator is capable of counteracting vibrations by applying an excitation force corresponding to vibration to be vibrated against a member to be vibration-isolated, By actively changing the spring characteristics according to the input vibration to reduce the dynamic spring, etc., it is possible to obtain a positive anti-vibration effect against the vibration. Application is considered.

  By the way, such an active fluid-filled vibration isolator requires an actuator that generates an excitation force, and such an actuator requires high controllability of frequency and phase with respect to the generated excitation force. Therefore, as an anti-vibration actuator employed in the active fluid-filled vibration isolator, for example, as described in the above-mentioned patent document, etc., a magnetic force or electromagnetic force generated by energizing a coil is used. An electromagnetic actuator adapted to drive the output member is preferably employed. Such an electromagnetic actuator is generally disposed on the opposite side of the vibration working chamber with the vibration member interposed therebetween, and its output member is connected to the vibration member. Then, by energizing the coil of the electromagnetic actuator, the output member is displaced by vibration, and the connected vibration member is displaced by vibration.

  However, such electromagnetic actuators have internal Joule heat (copper loss) due to the current flowing through the coil, eddy current loss and hysteresis loss (iron loss) in the iron core, loss due to friction between members (mechanical loss), etc. Due to the loss, the electromagnetic actuator itself generates heat during driving. Therefore, when there is a rubber member such as a rubber elastic film constituting the wall portion of the fluid chamber, which is disposed directly opposite to the electromagnetic actuator, the electromagnetic member There is a possibility that an adverse effect due to the heat generated by the actuator may be exerted, resulting in a change in the spring characteristics of the rubber member, resulting in a decrease in the vibration isolation performance, or a deterioration of the rubber member, resulting in insufficient durability.

  In addition, the existence of such a rubber member and the problem of deterioration due to heat generated by the electromagnetic actuator have a problem of greatly affecting the stability of the output characteristics of the electromagnetic actuator itself.

  That is, in the electromagnetic actuator, as is well known, the action of the magnetic force or electromagnetic force generated by energizing the coil member varies greatly depending on the gap size such as the magnetic gap formed by the coil member or the output member. However, the gap size is very small and needs to be managed with high accuracy.

  However, as described above, when the rubber member is deteriorated, fillers such as an anti-aging agent and an extender for the rubber member are likely to bleed on the surface. When these fillers become powdery foreign matter and enter the gaps of the electromagnetic actuator, there is a concern that the operation stability of the electromagnetic actuator is hindered.

  For such a problem, for example, as disclosed in Patent Document 3, it is conceivable to dispose dust-proof rubber so as to cover the upper side of the electromagnetic actuator. However, it is impossible to avoid the deterioration of the rubber member due to the heat generated by the electromagnetic actuator only by providing such dust-proof rubber. Furthermore, in the structure as shown in Patent Document 3, the dust-proof rubber itself for preventing dust from entering is formed of a rubber elastic film, and dust generated from the dust-proof rubber may enter the actuator, It is not always possible to say that it exhibits an effective dustproof effect.

JP-A-11-351313 JP 2001-1765 A JP 2000-227137 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to reduce the deterioration of the flexible film due to heat transfer from the electromagnetic actuator, and It is an object of the present invention to provide an active fluid-filled vibration isolator having an improved structure capable of improving the durability of a conductive film and an electromagnetic actuator.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are based on the entire specification and drawings, or based on the inventive concept that can be grasped by those skilled in the art from these descriptions. It should be understood that

(Aspect 1 of the present invention)
That is, according to the first aspect of the present invention, the first attachment member attached to one member to be vibration-proof connected is separated from the one opening side of the cylindrical second attachment member attached to the other member. By placing and connecting the first mounting member and the second mounting member with a main rubber elastic body, one opening of the second mounting member is covered with the main rubber elastic body, By covering the other opening of the second mounting member with a flexible film that is easily deformable, a sealed region of incompressible fluid is formed between the opposing surfaces of the main rubber elastic body and the flexible film. In addition, a vibration member that is elastically supported by a support rubber elastic body with respect to the second mounting member is disposed so as to partition the enclosed region, so that a part of the wall portion is elastic to the main body rubber. The vibration action chamber composed of a body and a part of the wall are composed of the flexible film. While forming the equilibrium chamber, an electromagnetic actuator that controls the pressure of the vibration working chamber by applying a driving force to the vibration member to displace the vibration member is provided with the flexible membrane interposed therebetween. An active fluid-filled vibration isolator disposed on the opposite side of the vibration working chamber, wherein the substantially annular ring extends so as to cover the electromagnetic actuator between the opposing surfaces of the flexible membrane and the electromagnetic actuator. A plate-shaped heat insulator is provided to fix the outer peripheral edge of the heat insulator to the electromagnetic actuator, and the inner peripheral portion of the heat insulator is raised toward the flexible film side to A projecting portion that is spaced apart from the actuator, and a driving rod is inserted into the center hole of the heat insulator, and the driving force of the electromagnetic actuator is increased by the driving rod. A cylindrical seal piece that is positioned on the outer peripheral side of the drive rod and that extends from the substantially central portion of the flexible membrane toward the heat insulator; and It is characterized in that the end portion of the cylindrical seal piece is brought into contact with the heat insulator to cover the central hole of the heat insulator.

  In the active fluid-filled vibration isolator having the structure according to this aspect, by arranging a specific shape of heat insulator and cylindrical seal piece in combination between the flexible film and the opposed surface of the electromagnetic actuator, Heat transfer to the flexible film due to internal loss of the electromagnetic actuator can be reduced. Thereby, deterioration of a flexible film | membrane can be reduced, the change of the spring characteristic of a flexible film | membrane can be suppressed, and the anti-vibration characteristic requested | required can be maintained stably over a long term.

  That is, in the present invention, a heat insulator having a specific shape of a protruding portion that rises toward the flexible membrane side and is separated from the electromagnetic actuator at the inner peripheral portion thereof is provided between the electromagnetic actuator and the flexible membrane. By disposing in between, the radiation heat generated by the electromagnetic actuator can be blocked by the heat insulator, and the radiation heat to the flexible film can be reduced.

  Furthermore, the upper space of an electromagnetic actuator can be made into a sealed area by covering the upper part of the electromagnetic actuator with a heat insulator and a cylindrical seal piece. Thereby, the electromagnetic actuator and the flexible membrane are blocked from each other, and the convective heat transfer from the electromagnetic actuator to the flexible membrane can be more effectively reduced.

  In addition, the protrusion is formed on the inner peripheral portion of the heat insulator, and a predetermined gap is secured between the outer peripheral edge and the flexible film, so that the bulging deformation of the flexible film is achieved. Therefore, the durability can be improved without changing the anti-vibration characteristics.

  Further, by reducing heat transfer to the flexible film, it is possible to suppress bleeding of various fillers filled in the flexible film on the surface of the flexible film. As a result, the amount of dust generated from the flexible film is reduced. Moreover, even if dust is generated, the dust can be prevented from entering the inside of the electromagnetic actuator by being guided from the protrusion formed on the heat insulator to the outer peripheral side away from the center hole of the heat insulator. -ing

  Further, in the present invention, the cylindrical seal piece integrally formed from the flexible film is brought into contact with the protruding portion of the heat insulator, so that the central hole through which the drive rod is inserted is covered with a substantially sealed state. The dust is prevented from entering through the central hole. The cylindrical seal piece covers the center hole of the heat insulator, so that dust can be prevented from entering the area where the electromagnetic actuator is disposed, and the dust generated from the flexible film can be more effectively heated. It becomes possible to guide to the outer peripheral direction away from the central hole of the insulator. Thus, it is possible to suppress dust from entering the inside of the electromagnetic actuator, improve the durability of the electromagnetic actuator, and stably obtain the required anti-vibration characteristics over a long period of time.

  Further, in the present invention, a high degree of sealing performance can be obtained by forming the cylindrical seal piece with a flexible film which is a rubber elastic body. Furthermore, by forming the cylindrical seal piece integrally with the flexible film, it is possible to realize these dustproof effects and heat insulation effects without increasing the number of parts.

(Aspect 2 of the present invention)
According to a second aspect of the present invention, in the active fluid-filled vibration isolator according to the first aspect, the drive rod is disposed substantially through the flexible film, and the flexible The membrane is fluid-tightly bonded to the outer peripheral surface of the drive rod, and spreads in a substantially skirt shape from the inner peripheral portion of the flexible membrane constrained by the drive rod toward the heat insulator. Thus, the cylindrical seal piece is projected and formed.

  In the active fluid-filled vibration isolator having the structure according to the present aspect, the deformation of the flexible membrane main body is softened by forming the cylindrical seal piece from the inner peripheral portion constrained by the drive rod. Will not be affected. In addition, since the cylindrical seal piece is formed not on the flexible membrane body portion that is easily deformed but on the portion restrained by the drive rod, the strength of the cylindrical seal piece is ensured and the drive It is possible to improve the durability against repeated deformation of the cylindrical seal piece by the vibration drive of the rod.

  Further, since the cylindrical seal piece is formed so as to spread in a substantially skirt shape toward the heat insulator, the cylindrical seal piece is softened against shear deformation, and the cylindrical seal piece is added to the drive rod. An adverse effect on the vibration displacement is avoided. Furthermore, the contact state of the cylindrical seal piece with the heat insulator can be maintained at a high level, and the dustproof effect and the heat insulating effect can be maintained even when the drive rod is displaced by vibration.

  As is apparent from the above description, in the active fluid-filled vibration isolator having the structure according to the present invention, the heat having a specific shape including the protruding portion rising toward the flexible membrane side in the inner peripheral portion. The insulator is disposed between the electromagnetic actuator and the flexible membrane, and the cylindrical seal piece formed integrally with the flexible membrane is brought into contact with the protruding portion to cover the center hole of the heat insulator. This effectively reduces heat transfer due to radiation and convection from the electromagnetic actuator to the flexible membrane, suppresses the deterioration of the flexible membrane, and maintains the desired anti-vibration characteristics stably over the long term. I can do it.

  Moreover, in addition to reducing the amount of dust generated from the flexible membrane by suppressing heat transfer to the flexible membrane, the center hole of the heat insulator has a cylindrical seal even if dust is generated. Covered by a piece, the dust is discharged in the outer circumferential direction by the protrusion of the heat insulator, so that the dust is prevented from entering the inside of the electromagnetic actuator, and the durability of the electromagnetic actuator is improved. I can do it.

  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 a first embodiment of the present invention. The engine mount 10 includes a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member that are spaced apart from each other and disposed therebetween. A mount main body 18 elastically connected by the interposed main rubber elastic body 16 is configured to be fitted into a stopper fitting 20. In the engine mount 10, the first mounting bracket 12 is attached to a power unit (not shown), while the second mounting bracket 14 is attached to an automobile body (not shown) so that the power unit is supported by vibration isolation against the body. It has become. Further, under such a mounted state, the engine mount 10 has a shared load of the power unit between the first mounting bracket 12 and the second mounting bracket 14 in the mount center axis direction which is the vertical direction in FIG. As a result, the main rubber elastic body 16 is elastically deformed in the direction in which the first mounting bracket 12 and the second mounting bracket 14 approach each other. Further, the main vibration to be vibration-proofed is input between the first mounting bracket 12 and the second mounting bracket 14 in a direction in which the mounting brackets 12 and 14 approach / separate each other. ing. In the following explanation, the vertical direction means the vertical direction in FIG. 1 in principle.

  More specifically, the first mounting member 12 has a truncated conical shape. Further, an annular plate-like stopper portion 22 protruding on the outer peripheral surface is integrally formed at the large-diameter side end portion of the first mounting member 12. Further, a fixed shaft 24 is integrally projected from the end portion on the large diameter side toward the upper side in the axial direction, and a fixing screw hole 26 that opens to the upper end surface is formed in the fixed shaft 24. The first mounting bracket 12 is attached to a power unit of an automobile (not shown) by a fixing bolt (not shown) screwed into the fixing screw hole 26.

  On the other hand, the second mounting bracket 14 has a large-diameter, generally cylindrical shape. In addition, a step portion 28 is formed in the intermediate portion in the axial direction of the second mounting bracket 14, and the upper side in the axial direction is a large-diameter portion 30 across the step portion 28, and the lower side in the axial direction is The small diameter portion 32 is used. Note that a thin seal rubber layer 34 is formed on the inner peripheral surface of the large diameter portion 30. Further, a diaphragm 36 made of a thin rubber film as a flexible film is disposed in the vicinity of the lower opening end of the small-diameter portion 32, and the outer peripheral edge of the diaphragm 36 is the second mounting bracket 14. By being vulcanized and bonded to the inner peripheral surface of the small-diameter portion 32, the lower opening in the axial direction of the second mounting bracket 14 is covered with a fluid-tight cover. Further, a connecting metal fitting 38 is vulcanized and bonded to the central portion of the diaphragm 36.

  The first mounting bracket 12 is positioned so as to be spaced apart upward in the axial direction of the second mounting bracket 14, and the first mounting bracket 12 and the second mounting bracket 14 are made of a main rubber elastic body. 16 is elastically connected.

  The main rubber elastic body 16 has a substantially truncated cone shape as a whole, and a mortar-shaped concave surface 40 is formed on the end surface on the large diameter side. The first mounting bracket 12 is vulcanized and bonded to the end surface on the small diameter side of the main rubber elastic body 16 in a state of being inserted in the axial direction. The stopper portion 22 of the first mounting bracket 12 is superimposed on the end surface on the small diameter side of the main rubber elastic body 16 and is vulcanized and bonded so as to be covered with the main rubber elastic body 16. The contact rubber 42 protruding upward from the main body rubber elastic body 16 is formed integrally with the main rubber elastic body 16, and a concave groove 44 is formed inside the contact rubber 42. A connecting sleeve 46 is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body 16 on the large diameter side.

  The connecting sleeve 46 vulcanized and bonded to the large-diameter outer peripheral surface of the main rubber elastic body 16 is fitted into the large-diameter portion 30 of the second mounting bracket 14 so that the large-diameter portion 30 is reduced in diameter. Thus, the main rubber elastic body 16 is fluidly fitted and fixed to the second mounting bracket 14. As a result, the axially upper opening of the second mounting bracket 14 is covered fluid-tightly by the main rubber elastic body 16, so that the main rubber elastic body is placed inside the second mounting metal 14. A liquid chamber 48 is formed as a sealed region that is fluid-tightly cut off from the external space between the opposing surfaces of 16 and the diaphragm 36, and the incompressible fluid is sealed in the liquid chamber 48.

  As the incompressible fluid to be enclosed, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like can be used, and in particular, to effectively obtain a vibration isolation effect based on the resonance action of the fluid. And a viscosity of 0.1 Pa. A low-viscosity fluid of s or less is preferably employed.

  Further, a partition member 50 and an orifice member 52 are incorporated in the second mounting member 14 and are disposed between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 36.

  The partition member 50 has a support rubber elastic body 54 that spreads with a predetermined thickness, and a vibration plate 56 as a vibration member is vulcanized and bonded to a central portion of the support rubber elastic body 54. The vibration plate 56 has a shallow, substantially cup shape, and an insertion concave groove 58 that opens downward in the axial direction is formed in the outer peripheral edge portion thereof. Vulcanized and bonded to the inner peripheral edge of the body 54. A buffer portion 60 is formed in the upper portion of the insertion concave groove 58 and the support rubber elastic body 54 is turned around to be thick.

  Further, an annular outer peripheral metal fitting 62 is vulcanized and bonded to the outer peripheral edge of the support rubber elastic body 54, and a peripheral groove 64 extending continuously in the circumferential direction is formed on the outer peripheral metal fitting 62. Yes. And the axial direction upper side opening part of this outer periphery metal fitting 62 is made into the flange-like part 66 extended radially outward, and the flange-like part 66 is piled up on the step part 28 of the 2nd attachment metal fitting 14, and a step part 28 and the connecting sleeve 46 are clamped and fixed. As a result, the partition member 50 is disposed so as to extend in the direction perpendicular to the axis at an intermediate portion between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 36, and the interior of the second mounting bracket 14 is divided into two sides in the axial direction. I'm coughing. Therefore, on the upper side across the partition member 50, a vibration action in which a part of the wall portion is constituted by the main rubber elastic body 16 and pressure fluctuations are generated due to elastic deformation of the main rubber elastic body 16 at the time of vibration input. A working fluid chamber 68 as a chamber is formed. On the other hand, below the partition member 50, an equilibrium chamber 70 is formed in which a part of the wall portion is constituted by the diaphragm 36 and volume change is easily allowed.

  Further, the orifice member 52 is configured by superimposing the upper and lower thin plates on each other, and the outer peripheral edge portion thereof is overlapped with the flange-like portion 66 of the outer peripheral metal fitting 62 so that the flange-like portion 66 and the main body rubber elasticity. By being sandwiched between the inner peripheral edge of the large-diameter side end portion of the body 16, the body 16 is fixedly supported by the second mounting bracket 14 via the outer peripheral bracket 62. As a result, the orifice member 52 is disposed so as to extend in the direction perpendicular to the axis at the intermediate portion between the opposing surfaces of the main rubber elastic body 16 and the partition member 50, and the working fluid chamber 68 is divided into two sides in the axial direction. Yes. Thus, a pressure receiving chamber 72 in which a part of the wall portion is formed of the main rubber elastic body 16 is formed on the upper side with the orifice member 52 interposed therebetween. On the other hand, on the lower side of the orifice member 52, a vibration chamber 74 is formed in which a part of the wall portion is constituted by a vibration plate 56.

  Further, a first orifice passage 76 in the form of a through hole that allows the pressure receiving chamber 72 and the vibration chamber 74 to directly communicate with each other is provided slightly outside from the central portion of the orifice member 52, and is about 50 to 150 Hz. It is tuned to a high frequency range such as a booming sound.

  Further, a circumferential passage 78 extending continuously in the circumferential direction between the overlapping surfaces of the upper and lower thin plates is formed in the outer peripheral edge portion of the orifice member 52. One end of the circumferential passage 78 is connected to the vibration chamber 74 through the communication hole 79. The outer peripheral edge of the orifice member 52 is overlapped with the outer peripheral edge of the partition member 50, and the second orifice passage is formed by covering the peripheral groove 64 formed in the outer peripheral edge of the outer peripheral metal fitting 62. 80 is formed. One end of the second orifice passage 80 is connected to the pressure receiving chamber 72 from the communication hole 79 through the vibration chamber 74 and the first orifice passage 76, and the other end is connected to the equilibrium chamber 70. Has been. Thus, a second orifice passage 80 that allows the pressure receiving chamber 72 and the equilibrium chamber 70 to communicate with each other is formed. The second orifice passage 80 is tuned to a low frequency range such as an engine shake of about 10 Hz.

  However, the specific forms and tunings of the first and second orifice passages 76 and 80 described above are merely examples, and are appropriately determined by those skilled in the art depending on the required vibration isolation characteristics, the basic structure of the vibration isolation device, and the like. It is to be changed and is not limited at all.

  Further, the mount body 18 having the above-described structure has the second mounting bracket 14 fitted into the stopper bracket 20 and is attached to the body of the automobile (not shown) via the stopper bracket 20. Yes.

  The stopper fitting 20 has a large-diameter stepped cylindrical shape, the lower side of which has a larger diameter than the upper side, and the mount main body 18 is inserted through the lower opening, and the locking step part 82 is inserted. It is locked by press fitting. On the other hand, a contact portion 84 extending inward is formed in the upper opening, and the stopper portion 22 of the first mounting bracket 12 contacts the contact portion 84 via the contact rubber 42. The stopper function in the rebound direction is exhibited. An insertion hole 86 is provided in the contact portion 84 so that an appropriate gap is maintained between the first mounting bracket 12 and the fixed shaft 24, and the first mounting bracket 12 is perpendicular to the axis. Relative displacement is allowed. In addition, a collar member 88 on the umbrella is attached to the fixed shaft 24 of the first mounting member 12 so as to cover the insertion hole 86 of the stopper member 20.

  The second mounting bracket 14 fitted in the stopper fitting 20 is locked by the locking step portion 82 of the stopper fitting 20 and is press-fitted and fixed so that it cannot be pulled out. Further, a plurality of leg portions 90 projecting on the outer peripheral surface and extending downward are fixed to the stopper fitting 20, and these leg portions 90 are placed on a body of an automobile not shown and fixed with fixing bolts. As a result, the engine mount 10 is mounted on the body of the automobile.

  Further, in the mount body 18, a vibration plate 56 provided on the partition member 50 is overlapped and fixed in close contact with a connection fitting 38 provided at the center portion of the diaphragm 36. A peripheral wall portion 92 that rises upward in the axial direction is formed on the outer peripheral edge portion of the coupling metal 38, and the peripheral wall portion 92 is fitted into the insertion concave groove 58 of the vibration plate 56 so that the vibration plate 56 can be inserted into the vibration plate 56. It is fixed. Here, the diaphragm 36 extends and is attached to the outer peripheral portion and the upper end portion of the peripheral wall portion 92, so that an incompressible fluid flows between the contact surfaces of the vibration plate 56 and the coupling fitting 38. It is prevented from entering.

  A connecting rod 94 is integrally formed as a drive rod extending in a rod shape downward in the axial direction at the central portion of the connecting bracket 38, and the connecting bracket 38 is fixed to the vibration plate 56. A connecting rod 94 that protrudes downward in the axial direction from the plate 56 is formed. The projecting tip surface of the connecting rod 94 has a circular flat tip contact surface 96 at the center, and the outer periphery of the tip contact surface 96 has a curved shape and rises in the axial direction. A contact surface 98 is provided.

  On the other hand, in the inside of the vibration chamber 74 constituting the working fluid chamber 68 in the mount body 18, a first coil spring 100 as a first biasing means is provided between the opposing surfaces of the orifice member 52 and the vibration plate 56. Accordingly, the vibration plate 56 is urged in a direction away from the working fluid chamber 68 (downward in the axial direction in the present embodiment). Here, the orifice member 52 and the vibration plate 56 are respectively formed with plateau-like protrusions 102 and 104 that protrude in a plateau shape, and these plateau-like protrusions 102 and 104 form the first coil spring 100. By locking, excessive displacement of the first coil spring 100 in the direction perpendicular to the axis is prevented. Since the first coil spring 100 is disposed inside the vibration chamber 74, that is, inside the incompressible fluid, the incompressible fluid is used as a lubricant, and the orifice member 52 and the vibration plate 56 are used. The occurrence of wear and abnormal noise due to rubbing is reduced.

  Further, an electromagnetic actuator as an electromagnetic actuator is provided on the lower side in the axial direction of the second mounting bracket 14 from which the connecting rod 94 is projected, that is, on the side opposite to the working fluid chamber 68 across the vibration plate 56 and the connecting bracket 38. A vibration exciter 106 is provided.

  The electromagnetic exciter 106 includes a coil 108 and a housing 110 fixedly assembled to the coil 108 so as to surround the coil 108. The housing 110 has a thick bottomed cylindrical shape, and is formed with an outer yoke portion 114 extending over the entire circumference in an L-shaped cross section so as to surround the outer peripheral surface and the lower end surface of the coil 108. A substantially cylindrical inner yoke 116 that extends so as to cover the entire inner circumferential surface of the coil 108 in the axial direction is assembled to the inner circumferential surface of the coil 108. The inner yoke 116 is assembled so that the upper end portion thereof is slightly higher than the coil 108, and is set at a position slightly lower than the upper end portion of the outer yoke portion 114. Further, the upper opening edge of each of the inner yoke 116 and the outer yoke 114 is slightly enlarged in diameter. The outer yoke portion 114 and the inner yoke 116 are each formed of a ferromagnetic material, and a magnetic pole is formed at the upper end portion of each of the outer yoke portion 114 and the inner yoke 116 when the coil is energized.

  On the other hand, an engagement groove 118 is formed on the outer peripheral edge of the housing 110, and a locking piece 120 formed on the lower edge of the second mounting member 14 is fitted into the engagement groove 118. Thus, the electromagnetic exciter 106 is attached so as to cover the lower end opening of the second mounting member 14. As described above, in the present embodiment, the electromagnetic exciter 106 is directly fixed to the second mounting member 14 without using a separate member such as a bracket. The positional deviation when assembled with the center axis of the is reduced. In addition, between the housing 110 of the electromagnetic exciter 106 and the second mounting bracket 14, a pressing rubber 122 formed by the diaphragm 36 extending downward is sandwiched, so that the electromagnetic excitation is performed. The backlash of the vessel 106 is prevented. As a result, the central axis of the coil 108 is substantially aligned with the central axis of the mount body 18 and is aligned with the central axes of the second mounting bracket 14 and the vibration plate 56. Further, the housing 110 has a bottomed cylindrical shape, and covers the lower opening of the second mounting member 14 in the axial direction, thereby preventing dust from entering from below.

  A heat transfer prevention plate 126 as a heat insulator is attached to the upper side of the housing 110. The heat transfer prevention plate 126 has a substantially hat shape having a diameter slightly smaller than the outer diameter of the housing 110, and a protruding portion 128 that rises toward the inner peripheral portion is formed. The insertion hole 130 is penetrated, and the connecting rod 94 is inserted. The diameter dimension of the insertion hole 130 is larger than the outer diameter dimension of the connecting rod 94 so that an appropriate gap is maintained between the connecting rod 94 and the relative displacement in the direction perpendicular to the axis of the connecting rod 94 is allowed. Has been. Further, the outer peripheral edge portion of the heat transfer prevention plate 126 is a press-fit fixing portion 132 that bends downward, and the press-fit fixing portion 132 is press-fitted into a press-fit groove 134 formed in the housing 110 so as to be fitted. The heat transfer prevention plate 126 is disposed between the opposed surfaces of the electromagnetic exciter 106 and the diaphragm 36 so as to cover the electromagnetic exciter 106. In order to effectively prevent heat transfer, it is desirable to use a material having a low heat transfer coefficient as the heat transfer prevention plate 126, and it is also possible to adopt not only a metal but also a synthetic resin, For example, iron or stainless steel is suitably used as the metal material, and nylon 6 or nylon 66 is suitably employed as the synthetic resin material.

  On the other hand, on the outer peripheral side of the connecting rod 94 in the substantially central portion of the diaphragm 36 located on the opposite side of the electromagnetic exciter 106 across the heat transfer prevention plate 126, a cylindrical shape protruding toward the heat transfer prevention plate 126 side. A cylindrical abutting wall 136 as a seal piece is integrally formed and abutted against the protruding portion 128 of the heat transfer prevention plate 126. Here, the cylindrical abutting wall 136 is abutted in a substantially skirt shape with its tip portion extending outward from the heat transfer preventing plate 126 along the inclined surface 138 of the protrusion 128 of the heat transfer preventing plate 126. Thus, even when the vibration plate 56 is vibrated and displaced by driving the electromagnetic vibrator 106, the contact state with the inclined surface 138 is maintained. The cylindrical abutment wall 136 covers the insertion hole 130 that is an opening of the heat transfer prevention plate 126, and the upper space of the electromagnetic exciter 106 is an internal space facing the outer peripheral surface of the diaphragm 36. Is a sealed area 139 that is blocked.

  An armature 140 as an output member is assembled in the housing 110 in which the coil 108 is assembled. The armature 140 is formed of a ferromagnetic material having a circular block shape as a whole, has an outer diameter slightly smaller than the inner diameter of the inner yoke 116, and is fitted into the inner yoke 116 on the same central axis as the coil 108. Therefore, it is assembled so as to be capable of relative displacement in the axial direction. Further, the armature 140 has an axial length dimension slightly larger than that of the coil 108, and an upper end portion of the armature 140 is a radial protrusion 142 whose outer diameter is widened to the vicinity of the inner peripheral edge of the outer yoke 114. Yes. The radial protrusion 142 forms a magnetic gap between the outer yoke 114 and the inner yoke 116 in which an effective magnetic attractive force is applied. For example, as shown in the figure, effective magnetic attraction force acts between the radial protrusion 142 and the upper end of the outer yoke 114 and between the radial protrusion 142 and the upper end of the inner yoke 116. It is supposed to be.

  The armature 140 is formed with a recess 144 that opens toward the connecting rod 94, and the bottom surface of the recess 144 is a flat contact surface 146 that extends in a direction perpendicular to the axis, while the recess 144 has On the opposite side, an accommodation space 148 that opens downward in the axial direction is formed. A second coil spring 150 as a second urging means is accommodated between the accommodation space 148 and the opposed surface of the bottom of the housing 110, and the armature 140 is vibrated by the second coil spring 150. It is biased towards the side. Here, an excessive displacement in the direction perpendicular to the axis of the second coil spring 150 is prevented by the insertion concave groove 152 formed in the accommodation space 148 and the plate-like convex portion 154 protruding from the lower portion of the housing 110. ing. In addition, since the accommodation space 148 is formed, it is possible to effectively secure the accommodation space while ensuring the free length of the second coil spring 150 and the axial dimension of the armature 140, thereby reducing the overall size. It has been. A plurality of communication holes 156 and 156 are provided in the contact surface 146 in the axial direction so that the upper and lower spaces of the armature 140 communicate with each other so as to act as an air spring in which the upper and lower spaces of the armature 140 are sealed. To avoid doing. In addition, a shock absorbing rubber 158 is bonded to a portion of the bottom portion of the housing 110 that faces the lower end surface of the armature 140, and the armature 140 abuts against the bottom portion of the housing 110 so that the hitting sound is reduced. In addition, durability is improved. In order to reduce wear due to rubbing with other members of the second coil spring 150, a collar member made of a low friction material such as polyethylene or polytetrafluoroethylene is provided at the axial end of the second coil spring 150. May be worn.

  The connecting rod 94 is inserted into the recess 144 of the armature 140 in a loosely inserted state, and the tip contact surface 96 of the connecting rod 94 is brought into contact with the contact surface 146 of the armature 140. . Here, the vibration plate 56 is biased in the direction toward the armature 140 by the first coil spring 100, and the armature 140 is biased in the direction toward the vibration plate 56 by the second coil spring 150. The vibration plate 56 and the armature 140 are urged toward each other, and the tip contact surface 96 of the connecting rod 94 and the contact surface 146 of the armature 140 are held in contact with each other. Become. Further, since the vibration plate 56 is urged in the direction toward the armature 140 by the first coil spring 100, a cylindrical shape that is substantially integrally connected to the vibration plate 56 via the connecting rod 94. The abutting wall 136 is also urged in the direction toward the heat transfer preventing plate 126, so that the cylindrical abutting wall 136 is more firmly abutted against the inclined surface 138, and the sealing state is high. Maintained. Note that the contact state between the connecting rod 94 and the armature 140 is not maintained only in the neutral state where the driving force is not applied to the armature 140, but also in the vibration state where the driving force is applied to the armature 140. In order to maintain the contact state, in short, the first and second coil springs 100 and 150 are attached so that the contact pressure that changes during transmission of the driving force is stably maintained at a value greater than zero. The force is set, and more preferably, the first and second coil springs 100 and 150 are set to the same spring constant.

  Here, the connecting rod 94 and the armature 140 are only brought into contact with each other in a non-fixed state, and a relative axial displacement is generated between the vibration plate 56 and the armature 140. Even so, such a misalignment is advantageously absorbed by the gap between the recess 144 of the armature 140 and the connecting rod 94. Here, since the insertion hole 130 of the heat transfer prevention plate 126 is maintained at a proper gap with the connecting rod 94, the displacement of the connecting rod 94 is not hindered. Further, since the connecting rod 94 abuts against the inner peripheral surface of the recess 144, the driving force of the armature 140 can be stably applied to the vibration plate 56.

  Under such an assembled state, the armature 140 is elastically positioned and held by the balance between the first and second coil springs 100 and 150. Under this state, the vibration plate 56 supported by the support rubber elastic body 54 and the armature 140 are not fixedly connected. Therefore, the support rubber elastic body 54 supports the armature 140 in the neutral state of the armature 140. Therefore, the durability of the support rubber elastic body 54 is improved.

  Further, in such a neutral state where the armature 140 is positioned, the urging force of the support rubber elastic body 54 against the first coil spring 100 and the second coil spring 150 exerting urging forces in opposite directions in the axial direction is axial. Compared to the axial elastic force exerted on the armature 140 by the support rubber elastic body 54, the armature 140 is maintained by the first coil spring 100 and the second coil spring 150. The elastic force in the axial direction exerted on is set sufficiently large. Accordingly, the elastic force in the axial direction exerted on the armature 140 by the first coil spring 100 or the second coil spring 150 is set sufficiently large while suppressing the amount of elastic deformation caused to the support rubber elastic body 54 in the neutral state. The armature 140 can be stably positioned in the axial direction in a neutral state while suppressing the characteristic change caused by the sag of the support rubber elastic body 54, and the axial driving force of the armature 140 can be increased. Based on the large spring rigidity set for the first coil spring 100 and the second coil spring 150, it is possible to transmit to the vibration plate 56 with excellent transmission efficiency and responsiveness. That is, since the contact state between the armature 140 and the connecting rod 94 is firmly maintained by the first and second coil springs 100 and 150, the driving force of the armature 140 is effectively applied to the vibration plate 56. It is transmitted.

  Although not shown, the engine mount 10 having the above-described structure can control the energization of the coil 108. For example, the engine ignition signal of the power unit is used as a reference signal and is also vibration-proofed. The energization control can be performed by performing feedback control such as adaptive control using the vibration detection signal of the power member as an error signal, or by using map control based on preset control data. As a result, by applying a magnetic force to the armature 140 and driving it to vibrate in the axial direction, a driving force corresponding to the vibration to be vibrated is applied to the vibration plate 56, so that the internal pressure of the working fluid chamber 68 is increased. An active vibration isolation effect can be obtained by the control.

  Therefore, in the engine mount 10 of the present embodiment, since the heat transfer prevention plate 126 is disposed so as to cover the upper part of the electromagnetic exciter 106, it is caused by an internal loss during driving of the electromagnetic exciter 106. It is possible to prevent heat generation from being exerted on the diaphragm 36 as much as possible.

  That is, since the heat transfer prevention plate 126 is disposed across the opposing surfaces of the electromagnetic vibrator 106 and the diaphragm 36, the radiant heat from the electromagnetic shaker 106 is blocked by the heat transfer prevention plate 126. Thus, direct transmission of radiant heat to the diaphragm 36 is prevented. Further, since the projecting portion 128 is formed in the central portion of the heat transfer preventing plate 126, the convection heat can be cooled by generating air flow in the inner space of the projecting portion 128 by driving the armature 140. In addition, the internal space of the projecting portion 128 is a sealed region 139 in which the insertion hole 130 serving as the opening is covered with a cylindrical abutting wall 136 integrally formed with the diaphragm 36, thereby The air heated by the heat generated by the vibrator 106 is contained in the sealed region 139 and does not leak outside, and the heated air is prevented from coming into contact with the diaphragm 36. In particular, in the present embodiment, the cylindrical abutting wall 136 is abutted against the inclined surface 138 of the projecting portion 128 by the first coil spring 100 in a pressed state, so that the air in the sealed region 139 is more advanced. Contained. As a result, it is possible to effectively prevent heat transfer to the diaphragm 36 due to heat generated by the internal loss of the electromagnetic exciter 106, and to suppress the deterioration of the diaphragm 36. Can be obtained effectively.

  In addition, a heat transfer prevention plate 126 is disposed above the electromagnetic vibrator 106, and the insertion hole 130, which is an opening of the heat transfer prevention plate 126, is covered with a cylindrical abutting wall 136. Since the upper portion of the electromagnetic exciter 106 is almost completely covered, even if dust is generated due to deterioration of the diaphragm 36, the dust does not enter the electromagnetic exciter 106. Further, since the inclined surface 138 is formed on the heat transfer prevention plate 126, the dust falling on the heat transfer prevention plate 126 is guided to the outer peripheral side of the heat transfer prevention plate 126 by the inclined surface 138 and collected. Intrusion of dust into the electromagnetic exciter 106 is more effectively prevented, and the durability of the electromagnetic exciter 106 is improved.

  As mentioned above, although embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not interpreted limitedly by the specific description in this embodiment.

  For example, the attachment mode of the heat transfer prevention plate 126 is not limited at all, and the press-fit fixing portion 132 is formed on the outer peripheral edge portion of the heat transfer prevention plate 126 as in the second embodiment shown in FIG. Alternatively, the outer peripheral edge portion of the heat transfer prevention plate 126 may be pressed against the housing 110 by the sandwiching rubber 122 while being placed on the upper surface of the housing 110 of the electromagnetic vibrator 106. In addition, in 2nd embodiment shown in FIG. 2, about the structure and member similar to the engine mount 10 as above-mentioned 1st embodiment, the code | symbol same as 1st embodiment is attached | subjected, and the thing is attached. Detailed description is omitted.

  Alternatively, the press-fitting fixing part 132 is formed and press-fitted and fixed in a press-fitting groove 134 formed in the outer peripheral edge of the housing 110, and the outer peripheral edge of the heat transfer prevention plate 126 is pressed against the housing 110 by the pressing rubber 122 and fixed. It is also possible to do.

  In the present invention, the outer peripheral edge of the heat insulator may be fixed directly or indirectly to and supported by the electromagnetic actuator. For example, the outer peripheral edge of the heat transfer preventing plate 126 may be It may be fixed to the mounting bracket 14 and fixed to the electromagnetic vibrator 106 via the second mounting bracket 14.

  Furthermore, the specific shape of the heat transfer prevention plate 126 can be changed as appropriate, and the press-fit fixing part 132 may be eliminated as described above. The protrusion 128 does not necessarily have to be formed as a flat surface, and can also be formed as an inclined surface. According to such an aspect, the dust falling on the heat transfer prevention plate 126 can be more effectively discharged to the outside of the heat transfer prevention plate 126.

  Furthermore, the connection mode between the vibration plate 56 and the armature 140 of the electromagnetic vibrator 106 is merely an example, and the armature 140 and the connection rod 94 may be fixedly connected. Alternatively, the vibration plate 56 and the connecting rod 94 may be separated and held in contact with each other so that they can be displaced relative to each other in a direction perpendicular to the axis. It is possible to more effectively absorb the displacement in the direction perpendicular to the axis between the vibration plate 56 and the armature 140 due to the above.

  Furthermore, the specific mode of the electromagnetic exciter 106 is not limited at all, and various modes can be adopted. For example, as described in Japanese Patent Laid-Open No. 2001-3981, The yoke members 114 and 116 in the electromagnetic exciter 106 in the first embodiment may have a substantially upside down structure, and a magnetic gap may be formed on the lower side of the electromagnetic exciter 106. As shown in Japanese Patent No. 351313, the lower end portion of the outer yoke may be extended in the inner circumferential direction to form a magnetic gap on the lower end surface of the armature.

  In addition, the present invention is not limited to the automobile engine mount having the shape as illustrated, but can also be applied to a so-called cylindrical mount, etc., in a body mount or a member mount for an automobile, or in various devices other than an automobile. The present invention can be similarly applied to a vibration isolator such as a mount or a vibration damper.

  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.

It is a longitudinal section showing an engine mount as a first embodiment of the present invention. It is a principal part expanded longitudinal sectional view which shows the engine mount as 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine mount 12 1st attachment bracket 14 2nd attachment bracket 16 Main body rubber elastic body 36 Diaphragm 38 Connection bracket 56 Excitation plate 70 Equilibrium chamber 72 Pressure receiving chamber 74 Excitation chamber 76 First orifice passage 80 Second orifice Passage 94 Connecting rod 100 First coil spring 106 Electromagnetic exciter 108 Coil 110 Housing 126 Heat transfer prevention plate 128 Projection portion 130 Insertion hole 132 Press-fit fixing portion 134 Press-fit groove 136 Cylindrical contact wall 140 Armature 150 Second coil spring

Claims (2)

A first mounting member attached to one member to be vibration-proof connected is arranged separately on one opening side of a cylindrical second mounting member attached to the other member, and the first mounting member By connecting the second mounting member with the main rubber elastic body, one opening of the second mounting member is covered with the main rubber elastic body, and the other opening of the second mounting member is covered. Are covered with an easily deformable flexible film to form an incompressible fluid sealing region between the opposing surfaces of the main rubber elastic body and the flexible film, and to the second mounting member. A vibration working chamber elastically supported by a supporting rubber elastic body is arranged so as to partition the enclosing region, whereby a vibration working chamber in which a part of the wall portion is constituted by the main rubber elastic body, and a wall A part of the part forms an equilibrium chamber composed of the flexible film, An electromagnetic actuator for controlling the pressure of the vibration action chamber by applying a driving force to the vibration member and oscillating and displacing the vibration member is disposed on the opposite side of the vibration action chamber with the flexible film interposed therebetween. Type fluid-filled vibration isolator,
A substantially annular plate-shaped heat insulator that extends so as to cover the electromagnetic actuator is disposed between the opposing surfaces of the flexible film and the electromagnetic actuator, and the outer peripheral edge of the heat insulator is attached to the electromagnetic actuator. While fixing to the actuator, the inner peripheral portion of the heat insulator is raised toward the flexible membrane to form a protruding portion that is separated from the electromagnetic actuator, while a drive rod is installed in the central hole of the heat insulator The drive rod transmits the driving force of the electromagnetic actuator to the vibration member by the drive rod, and is positioned on the outer peripheral side of the drive rod from the substantially central portion of the flexible membrane to the heat insulator A cylindrical seal piece extending toward the surface is integrally formed, and the tip of the cylindrical seal piece is brought into contact with the heat insulator. , Active fluid filled type vibration damping device, characterized in that the covering the central hole of the heat insulator. The drive rod is disposed substantially through the flexible membrane, the flexible membrane is fluid-tightly bonded to the outer peripheral surface of the drive rod, and the flexible 2. The active fluid-filled type protection according to claim 1, wherein the cylindrical seal piece protrudes from an inner peripheral portion of the membrane constrained by the drive rod so as to spread in a substantially skirt shape toward the heat insulator. Shaker.

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