JP2006258235A - Active type vibration control actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an excitation mechanism by mainly eliminating influence of lateral acceleration by vehicle vibration or the like of the excitation mechanism to a solenoid type drive member in an active type vibration control actuator. <P>SOLUTION: The active type vibration control actuator is provided with a mass member (M) having a predetermined mass relative to an object to be damped; and the excitation mechanism for exciting the mass member (M) and connected to the mass member (M) through an elastic body 26. The excitation mechanism is provided with a projection-like member 28 for supporting the mass member (M) and divided from the mass member (M); and a drive member for driving the projection-like member 28 by increase/decrease of electro-magnetic force and vibrating the mass member (M). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an active vibration-proof actuator that actively suppresses vibration from a vibration generation source such as an engine that is a power source in transportation equipment.

  As an example of this type of active vibration isolation actuator, an active vibration isolation device disclosed in Patent Document 1 is known. In this conventional example, a vibration fitting (14) as a mass member is a leaf spring (16 as an elastic support member), compared to a yoke fitting (12) as a yoke member fixed to a vibration suppression target such as an automobile body. ) Is elastically connected and supported via Thereby, one vibration system is configured in which the vibration fittings (14) and the like are mass systems and the leaf spring (16) is a spring system. The coil (18) is fixedly assembled to the yoke fitting (12), and a magnetic relative displacement force (excitation force) is applied to the excitation fitting (14) by energizing the coil (18). ). And the vibration in the vibration suppression target is actively suppressed by performing relative excitation control of the vibration fitting (14) with respect to the yoke fitting (12).

  The yoke fitting (12) as a yoke member is made of a magnetic material, and is inserted and arranged in the coil (18), and the yoke member (12) is protruded on both sides in the axial direction of the coil (18). Magnetic pole portions (42a, 42b) are formed by yoke members (12) at the outer peripheral portions on both sides. On the other hand, a mass member (14) made of a magnetic material is disposed on the outer peripheral side of the yoke member (12) so as to be relatively displaceable in the axial direction. An elastic support member (16) for elastically positioning the yoke member (12) and the mass member (14) relative to each other in the axial direction is provided. Further, in the mass member (14), each magnetic pole portion (42a, 42b) are formed on the outer peripheral side of the magnetic pole part (44, 46) which is separated from the outer peripheral side and biased to one side in the axial direction to be opposed to each other and fed to the coil (18). A relative driving force in the axial direction is exerted on the yoke member (12) and the mass member (14) based on the magnetic force applied between the portion (42a, 42b) and the magnetic attraction portion (44, 46). I am doing so.

  However, when the mass member (14) receives lateral acceleration due to vehicle vibration due to road surface disturbance or the like, the elastic support member supports the mass member (14) as the mass member (14) is displaced in the lateral direction. Since (16) is elastically deformed, the radial clearance between the mass member (14) and the outer peripheral side of the yoke member (12) is narrowed, and there is a possibility of worst contact. Since the desired suction force cannot be obtained when the mass member (14) and the yoke member (12) come into contact with each other, it is necessary to set a radial clearance in a wide range in consideration of the displacement, and a desired suction with a wide set gap. In order to obtain the force, it is necessary to increase the number of turns of the coil (18) or to increase the coil wire diameter in order to increase the amount of power supplied to the coil (18). .

Also, Patent Document 2 proposes an active vibration isolator that is fixed to a vibration suppression object via a rubber elastic support member, but still eliminates the influence of lateral acceleration on the mass member. Not be able to.
JP 2002-181126 A JP 2004-44680 A

  The technical aspect of the present invention is to reduce the size of a vibration mechanism in an active vibration isolation actuator by eliminating the influence of lateral acceleration mainly due to vehicle vibration on the electromagnetic drive member of the vibration mechanism. It was an issue.

The first technical measure taken to solve the above problems is as follows:
An active vibration isolating actuator comprising: a mass member having a predetermined mass with respect to a vibration suppression target; and a vibration mechanism that vibrates the mass member and is coupled to the mass member via an elastic body. ,
The excitation mechanism includes a convex member that supports the mass member and is divided from the mass member, and a driving member that drives the convex member by increasing or decreasing electromagnetic force to vibrate the mass member. That is.

Further, the second technical means is the first technical means,
One or both of the contact surfaces of the convex member and the mass member have a spherical shape, and the mass member is supported in a point contact state.

The third technical means is the first technical means,
The convex member has a magnetic plunger driven by the electromagnetic force and a shaft press-fitted into the plunger, and is held by a bearing so as to be slidable in the axial direction.

The fourth technical means is the third technical means,
The drive member includes a coil member that generates the electromagnetic force, a yoke member that opposes an end surface of the coil member and forms a magnetic gap between the magnetic plunger, and the coil member and the yoke member. And an elastic body that is interposed and urges both to separate in the axial direction.

The fifth technical means is the third technical means,
The drive member includes a coil member that generates the electromagnetic force, and a yoke member that opposes an end surface of the coil member and forms a magnetic gap with the magnetic plunger. The yoke member and the magnetic plunger The taper which comprises a magnetic attraction part was formed in at least one of these.

  By taking the first technical means, the mass member slides on the end surface of the convex member supporting the mass member even when the mass member receives acceleration in the lateral direction mainly due to vehicle vibration or the like. The radial clearance of the magnetic attraction unit is not affected. Therefore, it is possible to set an optimal radial clearance that effectively draws the magnetic attraction force, and thus the vibration mechanism can be downsized.

  By adopting the second technical means, the friction force when the mass member slides on the end face of the convex member supporting the mass member is reduced, the load in the radial direction of the bearing portion is reduced, and the life is extended. Can be achieved.

  By adopting the third technical means, the magnetic plunger does not move laterally even if lateral acceleration due to vehicle vibration or the like is applied, so the radial clearance set in the suction section is always constant over the entire circumference. Controllability is improved.

  By taking the fourth technical means, the arrangement of the yoke member corresponding to the magnetic pole portion in the axial direction is restricted with respect to the vibration in the vertical direction, and the attractive force is stabilized.

  By taking the fifth technical means, the amount of change in magnetic flux due to the displacement of the magnetic plunger is reduced, so that the attractive force is stabilized.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In the following description, the vertical direction refers to the vertical direction in FIG.

  The active vibration isolation actuator described in the present embodiment is fixed to a vibration suppression target member 11 such as an automobile body (not shown) and actively suppresses vibration from the engine.

  As shown in FIG. 1, the case 13 is substantially cylindrical and the upper part is narrowed by one step, and the narrowed lower surface restricts the position of the upper yoke 15 in the axial direction. Further, the upper portion of the case 13 is expanded and bent upward through the upper flat portion 13a, and the ring-shaped rubber elastic body 26 is press-fitted and held by the inner diameter of the large-diameter portion 13c bent upward from the upper flat portion 13a. That is, the case 13 is composed of a middle body portion 13b and a large diameter portion 13c having two different outer diameters.

  The inner diameter of the middle body portion 13 b of the case 13 is substantially the same as the outer diameter of the upper flange 15 c of the upper yoke 15, and the upper yoke 15 and the coil member 18 are inserted into the case 13. A part of the side surface of the case 13 is provided with a notch 33 for arranging the wiring connection terminal 32 from the coil member 18. The lower end portion 13d of the case 13 has an inner diameter that is one step larger and thinner, and has substantially the same diameter as the outer diameter of the lower flange 20a of the lower yoke 20. After the lower yoke 20 is inserted into the lower end portion 13 d of the case 13, the bottom plate 25 is brought into close contact with the lower surface of the lower flange 20 a of the lower yoke 20 via the seal member 24, and the thin portion is folded back to the inner diameter side of the case 13. Caulking is integrated. A plurality of substantially L-shaped mounting plates 12 are integrated with the case 13 by spot welding as required on the outer surface of the middle body portion 13b, and are fastened to the vibration suppression target member 11 by bolts or the like. .

  The bottom plate 25 has a disk shape in which a positioning uneven portion 25a of the spring 23 is formed at the center, and is tightly fixed to the lower yoke 20 via a seal member 24 to ensure airtightness. Further, it is inserted into a hole 22 a formed in the lower part of the plunger 22, and receives a reaction force of a spring 23 that urges the plunger 22 upward.

  The yoke member is composed of two parts, an upper yoke 15 and a lower yoke 20. The upper yoke 15 is formed with an upper flange 15c inserted into the inner diameter of the case 13 at the upper portion and a boss portion 15d inserted into the inner diameter of the coil member 18 below the center, and the plunger 22 is sucked into the inner diameter of the boss portion 15d. A taper-shaped magnetic attraction portion 15b is provided. A bearing 30 for press-fitting and holding the shaft 21 in the axial direction is press-fitted into the center of the upper yoke 15. As shown in FIG. 3, the center hole of the upper yoke 15 into which the bearing 30 is press-fitted is connected to the upper and lower spaces of the upper yoke 15 and includes a plurality of communication grooves 15a through which air can flow.

  The lower yoke 20 is formed with a lower flange 20a inserted into the lower diameter of the lower end portion of the case 13 at the lower portion thereof. The upper surface of the lower flange 20a is in pressure contact with the coil member 18 via the seal member 19. . A hole into which the plunger 22 is inserted is formed at the center of the lower yoke 20, and a bearing 31 that holds the plunger 22 slidably in the axial direction is press-fitted into the lower half of the hole.

  The plunger 22 has a cylindrical shape made of a magnetic material, and has a hole 22a into which the spring 23 is inserted. The upper third of the outer surface has a tapered shape that matches the shape of the magnetic attracting portion 15b described above, and is disposed at a position facing the conical shape of the upper yoke 15 to constitute the magnetic attracting portion. Yes. Also, one or more spiral grooves 22b as shown in FIG. 2 are formed on the outer surface of the plunger 22 (only one surface is shown), and when the plunger 22 moves up and down, Air can flow. A non-magnetic shaft 21 slidably held on a bearing 30 fixed to the upper yoke 15 is press-fitted and integrated at the center of the upper surface of the plunger 22.

  The coil member 18 is a coil wound around a bobbin made of an electrically insulating resin. After the coil is wound, the outer diameter is filled and sealed to the same diameter as the inner diameter of the case 13 by the same type of electrically insulating resin molding, and the connection terminal 32 is integrally molded.

  A wave washer 17 is inserted between the upper end of the coil member 18 and the lower surface of the upper flange 15c of the upper yoke 15, and urges them away. The seal member 19 is interposed between the upper surface of the lower flange 20a of the lower yoke 20 and the lower end surface of the coil member 18, and the upper surface of the upper flange 15c of the upper yoke 15 and the lower surface of the upper flat portion 13a of the case 13. The inserted sealing member 14 is compressed to ensure the airtightness of each joint surface. Further, the sealing member 16 inserted in the lower surface groove portion of the upper flange 15 c of the upper yoke 15 ensures airtightness with the coil member 18.

  Further, the wave washer 17 urges the coil member 18 and the upper yoke 15 apart in the axial direction, thereby absorbing the axial shape error of both and regulating the position.

  The mass member (M) includes a weight 27 made of a disk-shaped metal lump having a mass corresponding to the vibration suppression target member 11, and a sheet 28 press-fitted into the center of the lower surface of the weight 27. The sheet 28 has a cylindrical surface with a spherical surface on one side and a flange for press-fitting positioning. The sheet 28 is pressed into the weight 27 and is in contact with the top surface of the shaft 21 with a spherical surface.

  The rubber elastic body 26 has a ring shape, and an inner diameter portion is firmly fixed to a portion of the lower portion of the weight 27 having a small diameter by vulcanization baking. An annular thin plate is integrally formed by vulcanizing and baking the outer peripheral portion, and the annular thin plate portion is press-fitted into the large-diameter portion 13 c of the case 13 to generate a predetermined tensile force on the rubber elastic body 26.

  The weight 27 is biased downward by the rubber elastic body 26. That is, the plunger 22 is biased downward via the shaft 21. On the other hand, the plunger 22 is urged upward by the spring 23, and the seat 28 and the shaft 21 come into contact with each other, and the initial position in the axial direction is regulated.

  Next, the operation of the above embodiment will be described. When the coil member 18 is energized from the control unit through the power supply lead wire in accordance with the magnitude of the vibration input from a vibration generation source (not shown), a magnetic field is generated in the upper yoke 15 and the lower yoke 20, and the plunger 22 and the upper yoke 15. A suction force is generated at the taper-shaped portion opposed to. The plunger 22 sucked by energization pushes up the mass member (M) composed of the weight 27 and the sheet 28 through the shaft 21. Since the mass member (M) is urged downward by the rubber elastic body 26, when power is cut off, the plunger 22 is pushed downward to move to a position that matches the reaction force of the spring 23. By repeating the above operation, the mass member (M) is vibrated up and down. Note that the amount of movement of the mass member (M) can be controlled by controlling the vibration frequency by changing the energization time and adjusting the supply current. The amount of movement of the mass member (M) and the vibration frequency are adjusted as appropriate, and an excitation force corresponding to the vibration to be damped is applied to the object to be damped, so that the vibration in the damped object is actively reduced.

  The suction portion will be described in more detail. Generally, the magnetic attraction force is inversely proportional to the stroke. In the present embodiment, since the magnetic attraction portion 15b is formed in a tapered shape, even when the plunger 22 moves upward from the neutral position and the overlap amount increases, conversely, it moves downward from the neutral position. Even when the overlap amount is reduced, the amount of change in the area of the overlap portion is small, so that the amount of change in the suction force in the axial direction is small and a stable suction force can be generated.

  As described above in detail, according to the present embodiment, a stable axial suction force is generated even when lateral acceleration is applied due to vehicle vibration or the like, and the excitation force corresponding to the vibration to be controlled is controlled. It affects the vibration target and actively reduces the vibration in the vibration suppression target.

  In the present embodiment, a method of press-fitting an annular thin plate in which the connection between the mass member and the drive unit is integrated with the outer peripheral portion of the rubber elastic body 26 by vulcanization and baking into the large-diameter portion 13c of the case 13 is provided. However, a configuration in which the upper end of the case 13 is formed in a conical shape, and the rubber elastic body 26 is directly vulcanized and baked on the outer surface of the case 13 to be firmly fixed is shown in FIG. 4 as another embodiment.

  Needless to say, the wave washer 17 inserted between the upper end of the coil member 18 and the lower surface of the upper flange 15c of the upper yoke 15 can be replaced with a disc spring. Furthermore, the spring 23 that urges the plunger 22 upward can be replaced with another elastic body or a rebound material.

It is sectional drawing of the active vibration-proof actuator which shows one Embodiment to which this invention is applied. It is a perspective view of the plunger employ | adopted as the active vibration isolating actuator shown by FIG. It is an AA view of FIG. It is sectional drawing of other embodiment.

Explanation of symbols

11 Damping target member 12 Mounting plate 13 Case 15 Upper yoke 17 Wave washer 18 Coil member 20 Lower yoke 21 Shaft 22 Plunger 23 Spring 25 Bottom plate 26 Rubber elastic body 27 Weight 28 Seat 30 Bearing 31 Bearing 32 Connection terminal

Claims (5)

An active vibration isolating actuator comprising: a mass member having a predetermined mass with respect to a vibration suppression target; and a vibration mechanism that vibrates the mass member and is coupled to the mass member via an elastic body. ,
The excitation mechanism includes a convex member that supports the mass member and is divided from the mass member, and a drive member that drives the convex member by increasing or decreasing electromagnetic force to vibrate the mass member. An active type vibration-proof actuator.   2. The active vibration-proof actuator according to claim 1, wherein one or both of contact surfaces of the convex member and the mass member have a spherical shape and support the mass member in a point contact state.   The convex member has a magnetic plunger driven by the electromagnetic force and a shaft press-fitted into the plunger, and is held by a bearing so as to be slidable in the axial direction. The active vibration-proof actuator as described.   The drive member includes a coil member that generates the electromagnetic force, a yoke member that opposes an end surface of the coil member and forms a magnetic gap between the magnetic plunger, and the coil member and the yoke member. The active vibration-proof actuator according to claim 3, further comprising an elastic body that is interposed and urges both to separate in the axial direction.   The drive member includes a coil member that generates the electromagnetic force, and a yoke member that opposes an end surface of the coil member and forms a magnetic gap with the magnetic plunger. The yoke member and the magnetic plunger The active vibration-proof actuator according to claim 3, wherein a taper constituting a magnetic attraction portion is formed on at least one of the active vibration-proof actuators.

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