JP2018139479A - Vibration isolation actuator - Google Patents

Abstract

A yoke member can be stably assembled while suppressing the tightening force exerted on the permanent magnet, and the use amount of the expensive permanent magnet is reduced, and the deterioration of the thermal demagnetization characteristics of the permanent magnet is avoided. An anti-vibration actuator having a novel structure that can be realized is provided. An anti-vibration actuator 10 includes a plurality of permanent magnets 64 that are spaced apart from each other in the circumferential direction and a strong magnet that is disposed on both axial sides of the plurality of permanent magnets 64. A pair of yoke members 60, 62 made of a magnetic material and a spacer member made of a non-magnetic material that is arranged between the circumferential directions of the plurality of permanent magnets 60, 62 and defines the distance between the pair of yoke members 60, 62 in the axial direction. 82 and a fixing member 90 that fixes the pair of yoke members 60 and 62 at a predetermined position of the distance between the axial directions by the spacer member 82. [Selection] Figure 2

Description

  The present invention relates to an anti-vibration actuator used in, for example, an active vibration damping device, and in particular, a coil member is disposed on a magnetic path formed by a magnet member, and an electromagnetic force is applied by energizing the coil member. The present invention relates to a vibration-proof actuator that generates a vibration force.

  2. Description of the Related Art Conventionally, in an active vibration isolator called an active type, an electromagnetic vibration isolating actuator has been employed to obtain an excitation driving force. Such an anti-vibration actuator generally includes an annular magnet member having magnetic poles on both sides in the axial direction, and a coil member disposed on a magnetic path by the magnet member, and a magnet is energized by energizing a coil constituting the coil member. An axial excitation force due to electromagnetic force is generated between the member and the coil member.

  Specifically, those described in Japanese Unexamined Patent Application Publication No. 2012-210835 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2000-234645 (Patent Document 2) are known as conventional vibration-proof actuators.

  By the way, in the conventional vibration-proofing actuators described in Patent Documents 1 and 2 described above, an annular permanent magnet that is continuous over the entire circumference in the circumferential direction is employed, and the permanent magnet A pair of yoke members disposed on both sides in the axial direction sandwich the permanent magnet from both sides in the axial direction and are fixed so as to exert a clamping force on the permanent magnet.

  However, in such a conventional vibration-proof actuator, the volume of the permanent magnet, which has a high material cost, tends to increase. Further, since a large clamping force is exerted on the permanent magnet, it becomes difficult to employ a permanent magnet made of a brittle sintered material, and there is a problem that the degree of freedom in design is limited. Moreover, since the permeance coefficient decreases as the perimeter of the permanent magnet and thus the surface area increase, the thermal demagnetization of the permanent magnet increases, which may adversely affect the stability of the output characteristics of the vibration-proof actuator. there were.

JP 2012-210835 A JP 2000-234645 A

  The present invention has been made in the background as described above, and the problem to be solved is that the yoke member can be stably assembled while suppressing the clamping force exerted on the permanent magnet, and the cost is high. An object of the present invention is to provide an anti-vibration actuator having a novel structure that can reduce the amount of permanent magnets used and avoid deterioration of the thermal demagnetization characteristics of the permanent magnets.

  A first aspect of the present invention includes a magnet member extending in the circumferential direction and a coil member disposed on a magnetic path formed by the magnet member, and the magnet member and the coil member are energized by energization of the coil member. An anti-vibration actuator in which an axial excitation force due to electromagnetic force is generated between the coil member and the coil member, wherein the magnet member is arranged with a plurality of permanent magnets spaced apart from each other in the circumferential direction; A pair of yoke members made of a ferromagnetic material disposed on both sides in the axial direction of the plurality of permanent magnets, and a non-direction that is arranged between the circumferential directions of the plurality of permanent magnets and defines the distance between the pair of yoke members in the axial direction. It is characterized by including a spacer member made of a magnetic material and a fixing member for fixing the pair of yoke members at a predetermined position of the axial distance by the spacer member.

  In the vibration-proof actuator structured according to this aspect, the permanent magnet is divided into a plurality of parts in the circumferential direction, so that the substantial size of the permanent magnet is suppressed even if the circumference of the magnet member increases. Thus, the increase in cost can be avoided and a large permeance coefficient can be secured to suppress thermal demagnetization.

  In addition, the clamping force of the pair of yoke members in the magnet member in the direction of mutual approach can be borne by the spacer member arranged using the space between the circumferential directions of the plurality of permanent magnets. It is possible to reduce a fixing force such as pinching between the pair of yoke members exerted on the. Therefore, it is possible to adopt a permanent magnet made of, for example, a brittle sintered metal while maintaining excellent strength and durability in the magnet member, and the degree of freedom in selecting and designing the permanent magnet can be greatly secured. .

  According to a second aspect of the present invention, in the vibration isolating actuator according to the first aspect, the permanent magnet is disposed on an outer peripheral side of the coil member.

  In the vibration-proof actuator having the structure according to this aspect, since the coil member is arranged on the inner peripheral side of the magnet member, while ensuring the number of turns of the coil for obtaining a necessary excitation force, the coil winding It is possible to reduce the total length of the. Further, by arranging the magnet member on the outer periphery, it is possible to easily set a sufficiently large space between the circumferential directions of the permanent magnet while securing a large perimeter and a substantial volume.

  According to a third aspect of the present invention, there is provided the vibration isolating actuator according to the second aspect, wherein the inner shaft member attached to the vibration suppression target is a hollow structure having an inner hole opened in at least one of the axial directions. The coil member is fixedly attached to the inner shaft member in an extrapolated state.

  In the vibration isolating actuator having the structure according to this aspect, even when the diameter dimension of the coil member or the magnet member arranged on the outer peripheral side of the inner shaft member is increased, the total length of the coil winding in the coil member is suppressed to reduce the coil. It is possible to reduce the size of the member and reduce the substantial volume of the permanent magnet to a small size, while achieving the desired output characteristics and making it possible to achieve further compactness and cost reduction more effectively. Become.

  According to a fourth aspect of the present invention, in the vibration-proof actuator according to any one of the first to third aspects, a permanent engagement between the permanent magnet and the spacer member is caused by the mutual engaging action. A restricting mechanism for restricting the movement of the magnet in the radial direction is provided.

  In the anti-vibration actuator structured according to this aspect, since the displacement of the permanent magnet having a plurality of divided structures in the magnet member is suppressed by the regulating mechanism, for example, the shaft by a pair of yoke members exerted on the permanent magnet It is possible to further reduce the directional tightening force and substantially eliminate the tightening force. Further, in this aspect, since the displacement of the permanent magnet is configured using the spacer member, the structure can be simplified as compared with a case where a special positioning member is separately provided.

  Furthermore, in this aspect, it is preferable that the following aspects are adopted. That is, according to a fifth aspect of the present invention, in the vibration-proof actuator according to the fourth aspect, the restriction mechanism is configured such that the overlapping surface with the spacer member on both sides in the circumferential direction of the permanent magnet is not in the radial direction. The engaging surface is configured to include a parallel shape, and movement of the permanent magnet in the radial direction is restricted by the engaging surface.

  According to a sixth aspect of the present invention, in the vibration isolating actuator according to any one of the first to fifth aspects, the permanent magnet and the yoke member are fixed to each other by a mutual engaging action. A restricting mechanism for restricting the movement of the magnet in the radial direction is provided.

  In the vibration isolating actuator having the structure according to this aspect, as in the fourth aspect, for example, the axial tightening force by a pair of yoke members exerted on the permanent magnet is further reduced, and the tightening force is substantially eliminated. It becomes possible. Further, in this aspect, since the displacement of the permanent magnet is configured using the yoke member, the structure can be simplified as compared with a case where a special positioning member is separately provided.

  In any one of the fourth to sixth aspects, it is preferable that the restricting mechanism has the following seventh or eighth aspect.

  According to a seventh aspect of the present invention, in the vibration isolating actuator according to any one of the fourth to sixth aspects, the restriction mechanism is provided on at least one of an inner peripheral side and an outer peripheral side of the permanent magnet. The engagement wall portion is configured so that the movement of the permanent magnet in the radial direction is restricted by the engagement wall portion.

  According to an eighth aspect of the present invention, in the vibration-proof actuator according to any one of the fourth to seventh aspects, the restriction mechanism is adjacent to the permanent magnet and the spacer member and / or the yoke member. The concave and convex engaging portion provided at the part is configured, and the concave and convex engaging portion restricts the movement of the permanent magnet in the radial direction.

  According to a ninth aspect of the present invention, in the vibration-proof actuator according to any one of the first to eighth aspects, the axial dimension of the spacer is larger than the axial dimension of the permanent magnet. A gap is formed between the permanent magnet and the yoke member in the axial direction.

  In the vibration-proof actuator structured according to this aspect, a gap is formed between the permanent magnet and the yoke member in the axial direction, so that the axial clamping force exerted on the permanent magnet from the yoke members on both sides is reduced. It becomes possible to reduce or avoid more reliably.

  According to a tenth aspect of the present invention, in the vibration isolating actuator according to the ninth aspect, a gap member made of an elastic material is disposed in the gap between the permanent magnet and the yoke member in the axial direction. It is what.

  In the vibration isolating actuator having the structure according to this aspect, a gap member made of an elastic material is provided in the gap between the permanent magnet and the yoke member in the axial direction. It can be effectively reduced that the permanent magnet is displaced in the axial direction and hits the yoke member to generate abnormal noise.

  According to an eleventh aspect of the present invention, in the vibration isolating actuator according to any one of the first to tenth aspects, the yoke member has an annular shape extending continuously over the entire circumference in the circumferential direction. It is what.

  In the vibration isolating actuator having the structure according to this aspect, since the yoke member is an annular member continuously extending over the entire circumference, the number of parts is reduced and the efficiency of the assembling work is improved. As a result, positioning of the yoke member in the magnet member is facilitated.

  In the vibration isolating actuator having the structure according to the present invention, the clamping force exerted on the permanent magnet is caused by causing the spacer member to bear a part or all of the clamping force of the pair of yoke members in the magnet member toward each other. The yoke member can be assembled stably while suppressing the force. Further, by adopting a split structure in which the permanent magnets are spaced apart from each other in the circumferential direction, it is possible to reduce the use amount of the expensive permanent magnets and avoid the deterioration of the thermal demagnetization characteristics of the permanent magnets.

The perspective view which shows the vibration-proof actuator as 1st embodiment of this invention in the state which removed the outer cover. It is a longitudinal cross-sectional view which shows the vibration-proof actuator shown by FIG. 1, Comprising: II-II sectional drawing in FIG. III-III sectional drawing in FIG. The perspective view of the longitudinal cross-section of the vibration-proof actuator shown by FIG. The perspective view which shows the magnet member which comprises the vibration-proof actuator shown by FIG. The longitudinal cross-sectional view of the magnet member shown by FIG. The perspective view which shows the permanent magnet which comprises the vibration-proof actuator shown by FIG. The perspective view which shows the spacer member which comprises the vibration-proof actuator shown by FIG. The perspective view which shows the state which mutually assembled | attached the permanent magnet shown by FIG. 7, and the spacer member shown by FIG. The top view which shows the state which mutually assembled | attached the permanent magnet and spacer member which comprise the vibration-proof actuator as 2nd embodiment of this invention. The longitudinal cross-sectional view which expands and shows the principal part of the vibration-proof actuator as 3rd embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIGS. 1 to 4 show an active vibration damping device 10 as a first embodiment of a vibration-proof actuator according to the present invention. In the perspective view of FIG. 1, the outer cover 12 is removed to show the internal structure. In the present embodiment, the active vibration damping device 10 is attached to the vehicle body 14 or the like that is the object of vibration damping so that an active vibration damping effect is exerted against the vibration of the vehicle body 14 or the like. It has become. In the following description, unless otherwise specified, the axial direction and the vertical direction refer to the central axial direction of the active vibration damping device 10 and the vertical direction in FIG.

  More specifically, the active vibration damping device 10 of this embodiment includes an inner shaft member 16 that extends in the vertical direction at the center. The inner shaft member 16 has a hollow, generally cylindrical shape that extends in the axial direction as a whole, and includes an inner hole 18 that has a substantially constant cross-sectional shape and extends in the axial direction. In the present embodiment, the inner hole 18 of the inner shaft member 16 penetrates in the axial direction, and the inner hole 18 is opened in both axial directions.

  Further, an outer peripheral flange portion 20 that protrudes to the outer peripheral side is provided at a lower end portion that is one of the inner shaft members 16 in the axial direction. In the present embodiment, the outer peripheral flange portion 20 is continuously formed over the entire circumference in the circumferential direction, and has an annular plate shape (flange shape). However, the outer peripheral flange portion may have a structure partially protruding on the periphery.

  The inner shaft member 16 is preferably formed of a rigid material such as a metal such as iron or an aluminum alloy or a synthetic resin such as a reinforcing resin. In the present embodiment, a large-diameter portion 22 having a larger outer diameter than the other portions of the inner shaft member 16 is formed at the lower end portion of the inner shaft member 16 (above the outer peripheral flange portion 20). . The large diameter portion 22 is formed over the entire circumference in the circumferential direction, and an annular step surface 24 extending in the direction perpendicular to the axis is formed by the upper end surface of the large diameter portion 22. That is, in the inner shaft member 16, the outer diameter dimension below the step surface 24 is relatively large, while the outer diameter dimension above the step surface 24 is relatively small. On the other hand, a screw portion 26 is provided on the outer peripheral surface of the upper end portion of the inner shaft member 16.

  The inner diameter dimension φA (see FIG. 2) of the inner hole 18 of the inner shaft member 16 is 40% or more of the axial dimension L (see FIG. 2) of the inner shaft member 16 (φA ≧ 0.4L). Is more preferable, and more preferably 50% or more (φA ≧ 0.5 L). In the present embodiment, the inner diameter dimension φA of the inner shaft member 16 is about 50% of the axial dimension L (φA≈0.5 L). Thereby, it becomes easy to utilize the inner hole 18 of the inner shaft member 16 as a work hole or a mounting hole, for example.

  A coil member 28 is externally attached to the inner shaft member 16. The coil member 28 includes an inner yoke member 30, resin bobbins 32 and 32 assembled in two stages on the inner yoke member 30, and coils 34 and 34 wound around the bobbins 32 and 32. ing.

  The inner yoke member 30 has a substantially cylindrical shape as a whole, and is formed of a ferromagnetic material such as iron, cobalt, or nickel. The inner yoke member 30 of this embodiment is composed of an upper inner yoke member 36 and a lower inner yoke member 38, and the upper and lower inner yoke members 36, 38 are overlapped with each other. Further, annular end-side flange portions 40 and center-side flange portions 42 are formed at both end portions in the axial direction of the upper and lower inner yoke members 36, 38, respectively, projecting to the outer peripheral side. In particular, in this embodiment, the upper inner yoke member 36 and the lower inner yoke member 38 are shaped to be reversed in the vertical direction, and the same member is reversed in the vertical direction so that the central flange portions 42 overlap each other. It is matched. As a result, the end side flange portions 40 and 40 protrude from the both end portions in the axial direction of the inner yoke member 30 to the outer peripheral side, and the center side flange portions 42 and 42 extend from the central portion in the axial direction of the inner yoke member 30 to the outer peripheral side. It protrudes.

  In each of the upper and lower inner yoke members 36, 38, an annular bobbin 32 having a recess 44 opened on the outer peripheral side is provided between the end flange portion 40 and the central flange portion 42 in the axial direction. The bobbin 32 is externally mounted and fixedly supported by being sandwiched between the end side flange portion 40 and the center side flange portion 42 in the axial direction.

  Further, coils 34 and 34 are formed by winding coil windings made of conductive metal wires in the recesses 44 and 44 of the bobbins 32 and 32. The ends of the coils 34 and 34 can be connected to an external power source (not shown) so that power can be appropriately supplied from the external power source. In the present embodiment, the upper coil 34 and the lower coil 34 have the wire wound around the bobbins 32 and 32 in opposite directions, and generate opposite magnetic fluxes by simultaneous energization. ing. Note that the upper and lower coils 34, 34 may be composed of mutually continuous wires.

  Further, the projecting tips (outer end portions) of the end side flange portions 40 and 40 and the center side flange portions 42 and 42 are bent in the axial direction, and the outer end portions of the end side flange portions 40 and 40 are in the center. The outer peripheral end portions of the side flange portions 42 and 42 face each other with a predetermined distance in the axial direction. As a result, both axial portions of the bobbins 32, 32 are covered from the outer peripheral side by the outer peripheral ends of the end side flange portions 40, 40 and the central side flange portions 42, 42. It is fixedly supported by being sandwiched at right angles.

  Furthermore, a magnetic path for guiding a magnetic flux by energizing the coils 34, 34 around the upper and lower coils 34, 34 is formed by the inner yoke member 30 including the end side flange portions 40, 40 and the center side flange portions 42, 42. It is supposed to be formed. And on the said magnetic path, the magnetic gaps 46 and 46 are formed by the clearance gap between the axial directions in the outer peripheral edge part of these edge part side flange parts 40 and 40 and the center side flange parts 42 and 42, respectively. Each of the magnetic gaps 46 and 46 has a substantially constant axial dimension and continuously spreads in an annular shape over the entire circumference.

  The upper and lower inner yoke members 36 and 38 constituting the inner yoke member 30 can be divided into, for example, a plurality of members in the axial direction, and the plurality of separately formed members are post-fixed to each other. Alternatively, they can be assembled to the inner shaft member 16 by being overlapped in the axial direction without being fixed to each other.

  And the leaf | plate springs 48 and 48 as an elastic member are piled up and arrange | positioned at the axial direction both end surfaces of the inner yoke member 30 made into such a structure. Each of the leaf springs 48 and 48 has a substantially thin annular plate shape, and is externally inserted into the inner shaft member 16 on both the upper and lower sides of the inner yoke member 30, and the inner peripheral portion thereof is located on the upper and lower sides of the inner yoke member 30. It is overlapped on both end faces and fixed as required. In the present embodiment, the plate springs 48, 48 are formed with a plurality of (three in the present embodiment) through-holes 50 extending in the circumferential direction and penetrating in the plate thickness direction. Spring length is set. A plurality of bolt insertion holes 52 are formed at appropriate positions on the outer peripheral portions of the leaf springs 48, 48.

  The coil member 28 and the leaf springs 48, 48 having the above structure are fixedly attached to the inner shaft member 16. That is, the lower plate spring 48, the coil member 28, and the upper plate spring 48 are externally inserted in this order from the upper side with respect to the inner shaft member 16, and a nut is attached to the screw portion 26 provided at the upper end portion of the inner shaft member 16. 56 is fastened. As a result, the inner peripheral portion of the coil member 28 is sandwiched between the large-diameter portion 22 of the inner shaft member 16 and the nut 56 via the leaf springs 48 and 48 and fixedly supported by the inner shaft member 16. ing.

  Here, a magnet member 58 as shown in FIGS. 5 and 6 is disposed on the outer peripheral side of the coil member 28. The magnet member 58 has an annular shape extending continuously over the entire circumference in the circumferential direction, and a plurality of upper and lower outer yoke members 60 and 62 as a pair of yoke members, and a plurality of them positioned between the axial directions. And a permanent magnet 64. That is, the upper and lower outer yoke members 60 and 62 are provided on both axial sides of the plurality of permanent magnets 64.

  The upper and lower outer yoke members 60 and 62 are substantially cylindrical or substantially annular members that continuously extend over the entire circumference in the circumferential direction, and are formed of a ferromagnetic material such as iron, cobalt, or nickel. . Each of the outer yoke members 60 and 62 has an axially inner end surface (a lower end surface for the upper outer yoke member 60 and an upper end surface for the lower outer yoke member 62) 65, 65 that is an overlapping surface with the permanent magnet 64. An annular flat surface is formed over the entire area.

  Further, on the inner peripheral surfaces of the upper and lower outer yoke members 60 and 62, a recessed groove portion 66 is formed that opens outward in the axial direction (that is, upward in the upper outer yoke member 60 and downward in the lower outer yoke member 62). The concave groove portion 66 has a predetermined circumferential dimension. In the present embodiment, in the upper and lower outer yoke members 60 and 62, the three concave groove portions 66, 66, and 66 are substantially equidistant on the circumference. Is provided. The groove portions 66, 66, 66 do not reach the inner end in the axial direction, and among the inner surfaces of the groove portions 66, 66, 66, the groove bottom surfaces 68, 68, 68 on the inner side in the axial direction are Each flat surface extends in a direction perpendicular to the axis.

  Further, a bolt insertion hole 70 penetrating in the vertical direction is provided in an axially inner portion serving as the groove bottom wall portion of the concave groove portions 66, 66, 66, and the bolt insertion hole 70 is connected to the upper and lower outer yokes. The members 60 and 62 open to the groove bottom surface 68 and the axially inner end surface 65. Two bolt insertion holes 70 are provided in each concave groove 66.

  Furthermore, on the inner circumferential surfaces of the upper and lower outer yoke members 60, 62, inner circumferential projections 72, 72, 72 projecting toward the inner circumferential side are provided between the circumferential directions of the recessed groove portions 66, 66, 66. . These inner peripheral projections 72, 72, 72 have a predetermined axis on the inner side in the axial direction on the inner peripheral surfaces of the upper and lower outer yoke members 60, 62 (lower side in the upper outer yoke member 60 and upper side in the lower outer yoke member 62). It extends in the circumferential direction with a directional dimension and a protruding dimension. Furthermore, on the axially outer end surfaces of the upper and lower outer yoke members 60, 62, outer peripheral portions between the circumferential directions of the concave groove portions 66, 66, 66 (portions positioned on the outer peripheral side of the inner peripheral protrusions 72, 72, 72). Are formed with bolt insertion holes 74 that open outward in the axial direction at positions corresponding to the bolt insertion holes 52 of the leaf springs 48, 48.

  In addition, on the axially inner end faces 65, 65 of the upper and lower outer yoke members 60, 62, projecting wall portions 76, 76 as engaging wall portions projecting inward in the axial direction are provided on the outer peripheral edge portion. . In this embodiment, these protrusion wall parts 76 and 76 are made into the cyclic | annular wall part extended continuously over the perimeter of the circumferential direction.

  The upper and lower outer yoke members 60 and 62 having such a structure are opposed to each other with a predetermined distance in the axial direction, and the recessed groove portion 66 and the inner circumferential protrusion 72 are formed at corresponding positions on the circumference. . Note that the upper and lower outer yoke members 60 and 62 are shaped upside down with respect to each other, and the same member can be used upside down.

  On the other hand, as shown in FIG. 7, the permanent magnet 64 of the present embodiment has a shape such that an annular permanent magnet is divided at three positions on the circumference, and has three curved magnets having a curved arc shape. 64, 64, 64 are provided spaced apart from each other in the circumferential direction. These permanent magnets 64, 64, 64 have predetermined axial dimensions and circumferential dimensions, and are arranged at substantially equal intervals on the circumference.

  Further, both end surfaces in the circumferential direction of the permanent magnets 64, 64, 64 spread in the radial direction (the direction that becomes the radial direction when assumed as an annular permanent magnet), and the radial center of the both end surfaces in the circumferential direction. Engaging convex portions 80 and 80 projecting outward in the circumferential direction are provided from the portion. In this embodiment, these engagement convex parts 80 and 80 have a semicircular cross section and extend in the axial direction (the central axis direction when an annular permanent magnet is assumed).

  Further, spacer members 82, 82, 82 as shown in FIG. 8 are provided between the circumferential directions of the permanent magnets 64, 64, 64. That is, each of the spacer members 82, 82, 82 has a curved arc shape in which an annular spacer member is divided at three locations on the circumference, and has predetermined axial dimensions and circumferential dimensions. They are arranged at substantially equal intervals above. These spacer members 82, 82, 82 are made of a nonmagnetic material such as stainless steel, aluminum, or copper, and in this embodiment, are made of austenitic stainless steel (SUS304). In the present embodiment, the axial dimensions of the spacer members 82, 82, 82 are slightly larger than the axial dimensions of the permanent magnets 64, 64, 64.

  In addition, the circumferential end surfaces of the spacer members 82, 82, and 82 are spread in the radial direction (the direction that becomes the radial direction when assumed as an annular spacer member), and at the radial center portion of the circumferential end surface. Are provided with engaging recesses 84 and 84 that are recessed inward in the circumferential direction. In the present embodiment, the engagement recesses 84 and 84 have a semicircular cross section corresponding to the engagement protrusions 80 and 80 and extend in the axial direction (the central axis direction when an annular spacer member is assumed).

  Furthermore, a bolt insertion hole 86 penetrating in the axial direction is provided in the central portion in the radial direction in the circumferential intermediate portion of each spacer member 82, 82, 82. In the present embodiment, each spacer member 82, 82, 82 is provided with two bolt insertion holes 86.

  As described above, the permanent magnets 64, 64, 64 and the spacer members 82, 82, 82 are alternately assembled in the circumferential direction as shown in FIG. In the present embodiment, the circumferential interval between the permanent magnets 64 adjacent to each other in the circumferential direction is substantially the same as or slightly larger than the circumferential dimension of each spacer member 82, and the permanent magnets 64, 64, 64 and the spacer The members 82, 82, and 82 can be assembled on the circumference without a substantial gap. That is, the engaging projections 80, 80 provided on the permanent magnet 64 enter the engaging recesses 84, 84 provided on the spacer member 82, and these are engaged with each other. Therefore, in the assembly 88 of the permanent magnet 64 and the spacer member 82, the permanent magnet 64 moves in the radial direction with respect to the spacer member 82 by the engaging action of the engaging convex portion 80 and the engaging concave portion 84. Is prevented. Therefore, in this embodiment, the concave / convex engaging portion that restricts the radial movement of the permanent magnets 64, 64, 64 is engaged with the engaging convex portion 80 provided in the adjacent portion between the permanent magnet 64 and the spacer member 82. It is comprised by the joint recessed part 84, and the control mechanism which controls the movement of the radial direction of the permanent magnets 64, 64, 64 including this uneven | corrugated engaging part is comprised.

  The substantially annular assembly 88 is held between the upper and lower outer yoke members 60 and 62. That is, the axially inner end surfaces 65 and 65 of the upper and lower outer yoke members 60 and 62 and the axially opposite end surfaces of the assembly 88 of the permanent magnet 64 and the spacer member 82 are overlapped, and the outer yoke members 60 and 62 are overlapped. The bolt insertion holes 70, 70 provided in the concave groove portion 66 and the bolt insertion holes 86 provided in the spacer member 82 are aligned in the circumferential direction, and the bolt 90 is inserted into the bolt insertion holes 70, 70, 86. It is inserted and fastened. Accordingly, the magnet member 58 shown in FIGS. 5 and 6 is configured, and the magnet member 58 includes the spacer member 82 and the bolt 90 in addition to the upper and lower outer yoke members 60 and 62 and the permanent magnet 64. It is configured.

  In particular, in this embodiment, since the axial dimension of the spacer member 82 is larger than the axial dimension of the permanent magnet 64, the axial distance between the upper and lower outer yoke members 60, 62 is defined by the spacer member 82. It has become so. Then, the bolts 90 are fastened to the upper and lower outer yoke members 60 and 62 and the spacer member 82, so that the upper and lower outer yoke members 60 and 62 are fixed at a predetermined position of the axial distance defined by the spacer member 82. Therefore, the fixing member that fixes the upper and lower outer yoke members 60 and 62 is constituted by the bolt 90.

  In the present embodiment, the outer diameter dimension of the assembly 88 of the permanent magnet 64 and the spacer member 82 is provided at the outer peripheral edge portions of the axially inner end surfaces 65 and 65 of the upper and lower outer yoke members 60 and 62. The protruding wall portions 76 and 76 are slightly smaller than the inner diameter. Thereby, the outer peripheral edge part in the axial direction both sides of the assembly 88 is covered with the projecting wall parts 76 and 76 from the outer peripheral side. Therefore, the permanent magnets 64, 64, 64 of the assembly 88 are prevented from being displaced to the outer peripheral side with respect to the upper and lower outer yoke members 60, 62. That is, in the present embodiment, when the permanent magnets 64, 64, 64 are displaced radially outward, the outer peripheral ends of the permanent magnets 64, 64, 64 abut against the projecting wall portions 76, 76 to be engaged. By doing so, the displacement of the permanent magnets 64, 64, 64 outward in the radial direction is regulated by the engaging action. Therefore, the restriction mechanism for restricting the radial displacement of the permanent magnets 64, 64, 64 includes the protruding wall portions 76, 76 provided between the permanent magnet 64 and the upper and lower outer yoke members 60, 62. Yes.

  The permanent magnets 64, 64, 64 constituting the magnet member 58 are each magnetized in the axial direction, and one of the N / S magnetic poles is formed on both upper and lower surfaces. That is, the permanent magnets 64, 64, 64 have magnetic poles that are paired with each other on the upper surface and the lower surface, for example, an N pole on the upper surface and an S pole on the lower surface. As the permanent magnets 64, 64, 64, ferrite magnets or alnico magnets can be used, but rare earth cobalt magnets are preferably used. In particular, the permanent magnets 64, 64, 64 are formed of a powder metal sintered body, so that the degree of freedom in shape can be improved.

  The permanent magnets 64, 64, 64 and the outer yoke members 60, 62 are opposed to each other with a slight gap between the axial directions. As a result, magnetic poles that are paired with each other are formed on the inner peripheral protrusions 72, 72 of the outer yoke members 60, 62 located on both axial sides of the permanent magnets 64, 64, 64. That is, N / S of the inner peripheral protrusion 72 of the upper outer yoke member 60 and the inner peripheral protrusion 72 of the lower outer yoke member 62 by the magnetic poles set on both axial end surfaces of the permanent magnets 64, 64, 64. Each one of the magnetic poles is provided. In the present embodiment, the inner peripheral surface of the inner peripheral protrusion 72 in the upper outer yoke member 60 and the inner peripheral surface of the inner peripheral protrusion 72 in the lower outer yoke member 62 are paired magnetic pole surfaces. The axial dimension of the magnetic pole part (inner peripheral protrusion 72) is smaller than the axial dimension of the magnetic gaps 46, 46 provided in the coil member 28.

  The magnet member 58 having such a structure is elastically supported with respect to the coil member 28. That is, the outer peripheral portions of the leaf springs 48 and 48 fixedly attached to the coil member 28 are provided on the leaf springs 48 and 48 so as to overlap with the axially outer end surfaces of the upper and lower outer yoke members 60 and 62. The bolt insertion holes 52 and the bolt insertion holes 74 provided in the upper and lower outer yoke members 60 and 62 are aligned in the circumferential direction. The bolt 92 is screwed into the bolt insertion hole 52 and the bolt insertion hole 74, whereby the magnet member 58 is elastically supported by the plate springs 48, 48 with respect to the coil member 28. In FIG. 3, the bolt 92 is not shown.

  As described above, the magnet member 58 is elastically supported with respect to the coil member 28, so that the magnet member 58 is elastically movable in the axial direction with respect to the coil member 28. That is, the coil member 28 is fixedly attached to the inner shaft member 16, so that the magnet member 58 can move elastically in the axial direction with respect to the inner shaft member 16. In the initial state such as when the coils 34 are not energized, the magnetic gaps 46 provided on the coil member 28 and the magnetic poles provided on the magnet member 58 (inner peripheral protrusions 72, 72) are positioned opposite to each other in the direction perpendicular to the axis. Thus, the upper and lower inner yoke members 36, 38 having the end side flange portion 40 and the center side flange portion 42 located on both sides of the magnetic gaps 46, 46 and the magnetic pole portions (inner peripheral protrusions 72, 72) are included. A magnetic path is formed. In other words, the coil member 28 including the inner yoke members 36 and 38 is disposed on the magnetic path formed by the permanent magnets 64, 64 and 64.

  In the active vibration damping device 10 of the present embodiment, the outer cover 12 is covered from above the inner shaft member 16 so as to cover the arrangement region of the coil member 28 and the magnet member 58 that generate electromagnetic force when energized. ing. The outer cover 12 has a substantially cylindrical shape with a bottom that opens downward, and a through hole 98 is formed in the center of the upper bottom wall 96. Then, the upper bottom wall 96 of the outer cover 12 is externally inserted into the inner shaft member 16 from above the nut 56 in a press-fit state, and the upper end portion of the outer cover 12 is fitted to the upper end portion of the inner shaft member 16. An O-ring 100 is provided between the overlapping surfaces of the upper end portion of the outer cover 12 and the upper end portion of the inner shaft member 16 to prevent water and dust from entering the outer cover 12. .

  On the other hand, the lower end portion of the outer cover 12 is bent toward the outer peripheral side to form a flange portion 102. The flange portion 102 is continuously formed over the entire circumference in the circumferential direction, and the flange portion 102 is overlapped with the outer peripheral flange portion 20 of the inner shaft member 16. Further, a caulking piece 104 protruding downward is formed at the outer peripheral end portion of the flange portion 102, and the lower end portion of the outer cover 12 is caulked and fixed to the outer peripheral flange portion 20 of the inner shaft member 16 by the caulking piece 104. Has been. An O-ring 106 is provided between the overlapping surfaces of the flange portion 102 and the outer peripheral flange portion 20 of the outer cover 12 to prevent water and dust from entering the outer cover 12. In short, between the inner shaft member 16 and the outer cover 12 assembled in an externally inserted state, a sealed space that is substantially cut off from the outer space is defined, and the coil member 28 is formed there. And an axial vibration mechanism composed of a magnet member 58, leaf springs 48, 48, and the like are disposed in a housed state.

  That is, in the active vibration damping device 10, a magnetic flux is generated around the coils 34, 34 when power is supplied to the coils 34, 34 from the outside, and the generated magnetic flux is a magnetic path formed by the inner yoke member 30. Thus, magnetic poles are formed on both sides of the magnetic gaps 46 and 46 in the axial direction.

  Thus, when a magnetic field is generated in the upper and lower magnetic gaps 46 and 46 by energization of the coils 34 and 34 of the coil member 28, the magnetic pole portions (inner peripheral protrusions 72 and 72) of the upper and lower outer yoke members 60 and 62 are generated. On the other hand, an axial magnetic attractive force is exerted. That is, in the upper and lower magnetic gaps 46, 46, opposite magnetic fields are generated on the respective opposing surfaces. For example, on the opposing surfaces sandwiching the upper magnetic gap 46, the upper side is the N pole and the lower side is the lower side. On the other hand, a magnetic pole having an S pole on the upper side and an N pole on the lower side is generated on the opposite surface across the lower magnetic gap 46 while an S magnetic pole is generated. As a result, the magnetic pole part (inner peripheral protrusion 72) of the upper outer yoke member 60 that faces the upper magnetic gap 46, and the magnetic pole part (inner peripheral protrusion 72) of the lower outer yoke member 62 that faces the lower magnetic gap 46. However, even when magnetic poles opposite to each other are set, electromagnetic force in the same axial direction is exerted.

  Based on the action of these magnetic forces, a driving force in any axial direction is applied to the magnet member 58 according to the energizing direction of the coil member 28 to the coils 34, 34. By controlling the energization interval and the energization direction to 34, it is possible to exert an axial excitation force on the inner shaft member 16 (coil member 28) on the magnet member 58 at a predetermined cycle.

  The active vibration damping device 10 having the above-described structure is attached to a vibration damping object such as the vehicle body 14. In the active vibration damping device 10 of the present embodiment, for example, a mounting piece (not shown) that protrudes further to the outer peripheral side extends from the outer peripheral flange portion 20 of the inner shaft member 16, and a bolt insertion hole is provided in the mounting piece. ing. Then, a bolt (not shown) is inserted into the bolt hole and screwed to the vehicle body 14 so that the active vibration damping device 10 is bolted to the vehicle body 14.

  The vibration transmitted to the vehicle body 14 is counteracted by the active vibration damping device 10, thereby providing a counteracting or positive damping effect on the vibration input to the vehicle body 14. It has come to be demonstrated.

  In the active vibration damping device 10 as described above, the permanent magnet 64 is divided in the circumferential direction, and since the spacer member 82 is provided between the circumferential directions, the permanent magnet is annular. Compared to the case, the cost can be reduced. In addition, the permeance coefficient can be increased and the thermal demagnetization can be suppressed compared to the case where the ring is formed, so that the output can be stabilized.

  In the magnet member 58, the upper and lower outer yoke members 60, 62 are fastened to the spacer members 82, 82, 82 with bolts 90, while the permanent magnets 64, 64, 64 are connected to the upper and lower outer yoke members 60, Since the upper and lower outer yoke members 60, 62 are fixed, the permanent magnets 64, 64, 64 are prevented from being subjected to an axial tightening force. Thereby, the damage etc. accompanying the tightening force exerted on the permanent magnets 64, 64, 64 can be prevented.

  In particular, by making the axial dimension of the permanent magnet 64 smaller than the axial dimension of the spacer member 82, a gap is formed between the upper and lower outer yoke members 60, 62 and the permanent magnets 64, 64, 64 in the axial direction. Therefore, it can be further avoided that an axial tightening force is exerted on the permanent magnets 64, 64, 64.

  Furthermore, in the present embodiment, a restriction mechanism that restricts the displacement of the permanent magnets 64, 64, 64 outward in the radial direction is provided. Specifically, projecting wall portions 76 and 76 projecting inward in the axial direction are provided at the outer peripheral edge portions of the upper and lower outer yoke members 60 and 62, and the projecting wall portions 76 and 76 and the permanent magnet 64, 64 and 64 abut against each other, so that displacement of the permanent magnets 64, 64, and 64 outward in the radial direction is restricted. Further, the engaging convex portions 80, 80 provided on the permanent magnet 64 and the engaging concave portions 84, 84 provided on the spacer member 82 are engaged with each other in a concave-convex manner, whereby the diameter of the permanent magnets 64, 64, 64 is obtained. Directional displacement is regulated. Since the displacement in the radial direction of the permanent magnets 64, 64, 64 is regulated by the regulation mechanism, the permanent magnet from the magnet member 58 is not exerted on the permanent magnets 64, 64, 64 in the axial direction. 64, 64, 64 can be prevented from falling off.

  In the present embodiment, since the coil member 28 is provided on the inner peripheral side of the magnet member 58, the total length of the wires constituting the coils 34, 34 is reduced while ensuring the number of turns of the coils 34, 34. Can be suppressed.

  Furthermore, in this embodiment, since the inner shaft member 16 has a hollow structure having the inner hole 18, it is possible to access other parts through the inner hole 18. Specifically, for example, when the active vibration damping device 10 is provided so as to cover the mounting position of the shock absorber on the vehicle body 14, the bolt is fastened or fastened to the piston rod of the shock absorber through the inner hole 18. Release is possible. In particular, as in the present embodiment, the inner diameter of the inner hole 18 is set to 40% or more of the axial dimension of the inner shaft member 16, so that the inner diameter of the inner hole 18 can be ensured to be large. Work through the holes 18 can be made easier.

  Furthermore, in the present embodiment, since the upper and lower outer yoke members 60 and 62 are annular, respectively, the work of assembling them to constitute the magnet member 58 can be facilitated. In particular, by making the upper and lower outer yoke members 60, 62 inverted in the vertical direction, the same member can be used, so that the manufacturing efficiency can be improved.

  Next, FIG. 10 shows an assembly 114 of the permanent magnet 110 and the spacer member 112 constituting the magnet member in the active vibration damping device as the second embodiment of the vibration isolating actuator according to the present invention. It is shown. In the present embodiment, a restriction mechanism that restricts the radial displacement of the permanent magnet 110 is provided with a restriction mechanism that is different from the first embodiment. However, the same restriction mechanism as that of the first embodiment may be employed. Since the structure other than the assembly 114 of the permanent magnet 110 and the spacer member 112 is the same as that of the first embodiment, the illustration is omitted. In the following embodiments, members and portions that are substantially the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted. To do.

  That is, in the permanent magnet 110 of the present embodiment, the magnet-side engagement surfaces 116 and 116 that are both end surfaces in the circumferential direction are straight lines extending in the radial direction (radial direction assuming a ring-shaped permanent magnet) (FIG. 10). It is inclined with respect to the inside (shown by a two-dot chain line), and is non-parallel to the radial direction. Specifically, the circumferential dimension on the inner circumferential side is larger and the circumferential direction on the outer circumferential side is larger than the case where both circumferential end surfaces of the permanent magnet (64) are radially expanded as in the first embodiment. The magnet side engagement surfaces 116 and 116 are inclined with respect to the radial direction so that the size is reduced.

  On the other hand, spacer side engagement surfaces 118, 118 that are both circumferential end surfaces of the spacer members 112, 112, 112 provided between the circumferential directions of the permanent magnets 110, 110, 110 correspond to the magnet side engagement surfaces 116, 116. Each of them extends in a slanting manner with respect to a straight line extending in the radial direction, and has a non-parallel shape with respect to the radial direction. Specifically, as compared to the case where both end surfaces in the circumferential direction of the spacer member (82) expand in the radial direction as in the first embodiment, the circumferential dimension on the inner circumferential side is small, and the circumferential direction on the outer circumferential side. The spacer-side engagement surfaces 118 and 118 are inclined with respect to the radial direction so that the size is increased.

  In the assembly 114 of the permanent magnet 110 and the spacer member 112, the magnet side engaging surfaces 116 and 116 of the permanent magnet 110 and the spacer side engaging surfaces 118 and 118 of the spacer member 112 are overlapped with each other and engaged. doing. That is, the engagement surfaces 116 and 118 on the magnet side and the spacer side are engagement surfaces that engage with each other, and the permanent magnet 110 and the spacer member 112 are connected to each other including the engagement surfaces. An overlapping surface is configured.

  In the assembly 114 as described above, when the permanent magnets 110, 110, 110 are subjected to a radially outward force, the overlapping surface (magnet side engagement surface 116) of the permanent magnet 110 and the spacer member 112. And the spacer-side engagement surface 118) is inclined with respect to the radial direction, the circumferential end portions of the permanent magnet 110 abut against the circumferential end portions of the spacer member 112, and the permanent magnets 110, 110, 110. Displacement in the radially outward direction is regulated. That is, in the present embodiment, the restriction mechanism that restricts the displacement of the permanent magnets 110, 110, 110 outward in the radial direction includes at least the magnet-side engagement surfaces 116, 116.

  The same effect as in the first embodiment can also be exhibited in the vibration-proof actuator provided with the assembly 114 of the permanent magnet 110 and the spacer member 112 having such a structure.

  Next, FIG. 11 shows a main part of an active vibration damping device as a third embodiment of the vibration isolating actuator according to the present invention. In the present embodiment, a gap member 122 is provided in the gap 120 between the permanent magnet 64 and the upper outer yoke member 60 in the axial direction. The gap member 122 is made of an elastic material, and has a leaf spring shape in this embodiment. The gap member 122 is preferably formed of a ferromagnetic material, but may be formed of a nonmagnetic material, for example, a rubber film having a predetermined axial dimension. The gap member 122 may be fixed to the upper outer yoke member 60, may be fixed to the permanent magnet 64, or may not be fixed to any of them.

  By providing the gap member 122, when the magnet member 58 is displaced in the axial direction in the active vibration damping device, the contact force of the permanent magnet 64 against the upper outer yoke member 60 is reduced by the elastic deformation of the gap member 122. Thus, it is possible to prevent the permanent magnet 64 from striking the upper outer yoke member 60 and generating abnormal noise.

  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 limited at all by the specific description regarding this embodiment.

  For example, in the above-described embodiment, the fixing member that fixes the upper and lower outer yoke members 60 and 62 to the specified position of the axial distance defined by the spacer member 82 is configured by the bolt 90, but is limited to this mode. It is not a thing. Illustratively, a stepped bolt may be employed as a nonmagnetic member that defines the separation distance in the approach direction between the axially opposed surfaces of the pair of yoke members 60 and 62. More specifically, for example, it is possible to employ a double-sided stepped bolt in which steps are provided at both ends of an axial intermediate portion that is formed into a large-diameter rod shape and both axial end portions are small-diameter male screw portions. By inserting the male threaded portions on both sides of such a double-sided stepped bolt into the through holes formed in the upper and lower yoke members 60 and 62 and screwing the fixing nuts from the outside and tightening, the stepped surfaces on both sides in the axial direction are moved up and down. The yoke members 60 and 62 are fastened by being overlapped with the opposing inner surfaces. Such a double-sided stepped bolt can serve as both a spacer member and a fixing member. In addition, since the distance between the opposing upper and lower yoke members 60 and 62 is defined by the double-sided stepped bolts, an area between the permanent magnets 64 and 64 adjacent to each other in the circumferential direction is formed as a space so as to penetrate the space. It is also possible to arrange both side stepped bolts.

  Furthermore, it is also possible to employ a sleeve-like fixing member. That is, as the fixing member for fixing the pair of yoke members 60 and 62, for example, a fixing sleeve that is externally inserted over the entire permanent magnet 64 and the upper and lower yoke members 60 and 62 is adopted in addition to the exemplified bolt. The permanent magnet 64 and the upper and lower yoke members 60, 62 are axially extended over the whole by caulking and fixing them to the outer peripheral edges of the respective axial ends of the upper and lower yoke members 60, 62 with both axial ends thereof facing the inner peripheral side. It is also possible to clamp and fix. As such a fixing sleeve, it is desirable to employ a nonmagnetic material.

  Furthermore, in the above-described embodiment, the three permanent magnets 64, 64, 64 are provided. However, the number of permanent magnets is not limited as long as a plurality of permanent magnets are provided. There may be four or more. In addition, it is not necessary to provide the spacer member between all the circumferential directions of the plurality of permanent magnets. Moreover, about a some permanent magnet, arrange | positioning at equal intervals on a periphery or employ | adopting the permanent magnet of the same shape is not essential. However, it is desirable that the magnetic field generated by the plurality of permanent magnets and the pair of yoke members 60 and 62 be symmetrical about the central axis so that an electromagnetic force in the axial direction is generated by energization of the coil member 28. .

  In the first embodiment, the present invention related to the vibration-proof actuator is applied to the active vibration damping device 10. However, the present invention relates to the vibration-proof device such as an engine mount. It is also possible to incorporate an anti-vibration actuator integrally. Furthermore, the present invention is applied to an active vibration isolator as disclosed in Japanese Patent Laid-Open No. 2002-188777, and a movable member constituting a part of the wall portion of the liquid chamber is vibrated to actively control the pressure in the liquid chamber. The present invention can also be applied to an anti-vibration actuator. Furthermore, in the above embodiment, the permanent magnet 64 is magnetized so as to have one magnetic pole at each end in the axial direction. However, depending on the configuration of the electromagnetic drive mechanism to be used, the position and polarity of the magnetic pole are included. The mechanical structure is appropriately set. For example, as shown in the above-mentioned Japanese Patent Application Laid-Open No. 2002-188777, a permanent magnet is used that is magnetized so as to have one magnetic pole on each side in the radial direction. It is also possible to constitute the present invention.

  Furthermore, in the above embodiment, the coil member 28 is fixedly attached to the inner shaft member 16 and the magnet member 58 is provided on the outer peripheral side thereof. However, the magnet member is fixedly attached to the inner shaft member. A coil member may be provided on the outer peripheral side. Further, the outer cover 12 is used as an outer cylinder member, and the magnet member 58 (or coil member) disposed on the outer peripheral side is fixedly supported on the outer cylinder member, and the coil member 28 disposed on the inner peripheral side is supported. (Or a magnet member) may be arranged on the outer periphery of the inner shaft member 16 so as to be relatively movable in the axial direction by the leaf springs 48, 48 or the like.

  Moreover, in the said embodiment, although the attachment piece extended from the outer peripheral flange part 20 of the inner shaft member 16 to the outer peripheral side, and was fixed to the vehicle body 14 by the said attachment piece, it is not limited to this aspect. . That is, a mounting piece extends from the inner hole of the inner shaft member to the inner peripheral side and is fixed to the vehicle body by the mounting piece, or a bolt extending from the vehicle body is inserted into the inner hole of the inner shaft member. It may be fixed to the vehicle body by being fastened. In this way, by attaching the inner shaft member to the object to be controlled using the inner hole, it is possible to reduce the overall size of the vibration-proof actuator. However, in the present invention, the inner hole of the inner shaft member is not essential. Further, the vibration suppression target is not limited to the vehicle body. Alternatively, the active vibration damping device may be attached to the vibration suppression target by being inserted into a through-hole provided in the vibration suppression target in a press-fitted state.

  Furthermore, in the embodiment, between the permanent magnet 64 and the outer yoke members 60, 62, an engagement wall portion (protruding wall portion) that protrudes from the outer peripheral edge portion of the outer yoke members 60, 62 toward the outer peripheral side of the permanent magnet 64. 76, 76) is provided to restrict the movement of the permanent magnet 64 outward in the radial direction. However, the present invention is not limited to this mode. That is, by providing an engaging wall portion that protrudes from the inner peripheral edge of the permanent magnet toward the inner peripheral side of the outer yoke member, the movement of the permanent magnet in the radially outward direction may be restricted. .

  Alternatively, even if the engagement wall portion that protrudes from the inner peripheral edge portion of the outer yoke member toward the inner peripheral side of the permanent magnet is provided, the movement of the permanent magnet inward in the radial direction is restricted. Even if the engagement wall portion protruding from the outer peripheral edge portion of the permanent magnet toward the outer peripheral side of the permanent magnet is provided, the movement of the permanent magnet inward in the radial direction is restricted. Good.

  In the first embodiment, the concave and convex engaging portions (engaging convex portions 80 and engaging concave portions 84) are provided between the permanent magnet 64 and the spacer member 82, and the permanent magnet 64 is radially outward. However, the present invention is not limited to such a mode. That is, the movement of the permanent magnet radially outward may be restricted by providing the concave and convex engaging portion between the axial direction of the permanent magnet and the outer yoke member.

  Further, in the second embodiment, the permanent magnet 110 and the spacer member 112 are overlapped with each other by inclining the overlapping surfaces (magnet side engaging surface 116, spacer side engaging surface 118) with respect to the radial direction. Although the movement of 110 in the radially outward direction is restricted, the movement of the permanent magnet inward in the radial direction is restricted by reversing the inclination direction of the overlapping surface of the permanent magnet and the spacer member. It may be like this.

  Moreover, in the said embodiment, although the upper and lower outer yoke members 60 and 62 were each made into the cyclic | annular form extended continuously over the perimeter of the circumferential direction, an outer yoke member may be divided | segmented in the circumferential direction.

10: Active vibration damping device (vibration-proof actuator), 14: Vehicle body (vibration target), 16: Inner shaft member, 18: Inner hole, 28: Coil member, 58: Magnet member, 60: Upper outer yoke member (Yoke member), 62: Lower outer yoke member (Yoke member), 64, 110: Permanent magnet, 76: Projection wall portion (engagement wall portion, restriction mechanism), 80: Engagement convex portion (concave engagement portion, restriction) Mechanism), 82, 112: spacer member, 84: engaging recess (concave engaging portion, regulating mechanism), 90: bolt (fixing member), 116: magnet side engaging surface (engaging surface, overlapping surface), 118: Spacer side engagement surface (engagement surface, overlapping surface), 120: gap, 122: gap member

Claims (11)

A magnet member extending in a circumferential direction; and a coil member disposed on a magnetic path formed by the magnet member, and an electromagnetic force is applied between the magnet member and the coil member by energizing the coil member. An anti-vibration actuator that generates an axial excitation force,
The magnet member includes a plurality of permanent magnets spaced apart from each other in the circumferential direction, a pair of yoke members made of a ferromagnetic material disposed on both axial sides of the plurality of permanent magnets, and the plurality of permanent magnets. A spacer member made of a non-magnetic material that is arranged between the magnets in the circumferential direction and defines a distance between the pair of yoke members in the axial direction, and the pair of yoke members are fixed at a predetermined position of the distance between the pair of yoke members in the axial direction. An anti-vibration actuator characterized by comprising a fixing member.   The vibration-proof actuator according to claim 1, wherein the permanent magnet is disposed on an outer peripheral side of the coil member.   An inner shaft member having a hollow structure having an inner hole opened in at least one of the axial directions and attached to a vibration control target is provided, and the coil member is fixedly attached to the inner shaft member in an extrapolated state. The vibration-proof actuator according to claim 2.   The control mechanism according to any one of claims 1 to 3, wherein a restriction mechanism is provided between the permanent magnet and the spacer member to restrict movement of the permanent magnet in the radial direction by mutual engagement. Anti-vibration actuator.   The restricting mechanism includes an engaging surface in which the overlapping surface with the spacer member on both sides in the circumferential direction of the permanent magnet has a non-parallel shape in the radial direction, and the permanent magnet is formed by the engaging surface. The vibration-proof actuator according to claim 4, wherein movement in the radial direction is restricted.   The restriction mechanism for restricting the radial movement of the permanent magnet by a mutual engagement action is provided between the permanent magnet and the yoke member. Anti-vibration actuator.   The restriction mechanism includes an engagement wall portion provided on at least one of the inner peripheral side and the outer peripheral side of the permanent magnet, and the radial movement of the permanent magnet is restricted by the engagement wall portion. The vibration-proof actuator according to any one of claims 4 to 6, wherein the vibration-proof actuator is provided.   The restricting mechanism is configured to include a concave and convex engaging portion provided in an adjacent portion between the permanent magnet and the spacer member and / or the yoke member, and the radial direction of the permanent magnet by the concave and convex engaging portion. The vibration-proof actuator according to any one of claims 4 to 7, wherein the movement of the vibration is restricted.   The gap between the permanent magnet and the yoke member is formed in the axial direction by making the axial dimension of the spacer member larger than the axial dimension of the permanent magnet. The vibration-proof actuator according to one item.   The vibration-proof actuator according to claim 9, wherein a gap member made of an elastic material is disposed in the gap between the permanent magnet and the yoke member in the axial direction.   The vibration-proof actuator according to any one of claims 1 to 10, wherein the yoke member has an annular shape that extends continuously over the entire circumference in the circumferential direction.

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