JP5379706B2 - Active vibration isolator and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an outer diameter of a body part, and to improve fitting property by simply fitting. <P>SOLUTION: This active vibration control device includes: a first plate spring member 28a fixed in the base body 12; a second plate sprig member 28b fixed to a ceiling surface 14f of a housing 14; a movable mechanism 30 elastically supported by the first plate spring member 28a and the second plate spring member 28b and fitted freely to displace along the axial direction; and a coil part 58 fixed to the disk-like support part 34 of the base body 12. The movable mechanism 30 has: a movable shaft body 36 elastically supported by the first plate spring member 28a and the second plate spring member 28b in both ends thereof along the axial direction; a first yoke 38, a permanent magnet 40 and a second yoke 42 held by the movable shaft body 36 and successively provided along the axial direction of the movable shaft body 36. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an active vibration isolator which is attached to a vibration isolation target member and can exhibit an active vibration isolating effect by exciting a movable element by energizing a coil portion, and a method for manufacturing the same.

  For example, in order to reduce vibration in a vibration isolation target member that requires vibration reduction, such as a vehicle body, generally, a vibration damping mechanism that uses a damping effect such as a shock absorber or a rubber elastic body, A vibration isolation mechanism using a spring effect such as a coil spring or a rubber elastic body is employed. Since both of these vibration damping mechanisms and vibration isolation mechanisms exhibit a passive vibration isolation function, in recent years, a mechanism that exhibits a more positive and advanced vibration isolation effect has been demanded.

  With regard to this type of active vibration isolator, for example, in Patent Document 1, the concentric positioning of the output member and the stationary support member is set to a high level, so that the clearance between the coil and the permanent magnet is high. There has been disclosed an active vibration isolator which is set with high accuracy and can efficiently vibrate and displace an output member.

JP 2008-208895 A

  By the way, in the active vibration isolator disclosed in Patent Document 1, in the assembling process, the inner peripheral portion of the disc-shaped leaf spring member is first assembled to the movable shaft portion constituting the output member. After housing the movable shaft portion in the housing, it is necessary to fix the outer peripheral edge portion of the leaf spring member with, for example, a fixing ring that is attached to the inner wall of the housing.

  For this reason, in the active vibration isolator disclosed in Patent Document 1, the fixed portion of the leaf spring member fixed to the housing must be set on the outer diameter side of the outer periphery of the output member, and as a result, Since the outer diameter of the housing is increased, it is difficult to reduce the outer diameter of the housing.

  The present invention has been made in view of the above points, and has an active vibration isolator capable of reducing the outer diameter of the main body portion and improving the assemblability by simply assembling the main body portion and a method for manufacturing the same. The purpose is to provide.

In order to achieve the above object, the present invention is an active vibration isolator that actively suppresses vibration of a vibration isolation target member, and is provided at a lower side and has both end portions along an axial direction opened. A main body configured by integrally coupling a substantially cylindrical base body and a bottomed cylindrical housing provided on the upper side, and the base body provided on one side in the axial direction in the main body A first leaf spring member that is fixed to the interior of the main body, a second leaf spring member that is provided on the other side along the axial direction in the main body and is fixed to the ceiling surface of the housing, the first leaf spring member, and the A movable element elastically supported by a second leaf spring member and assembled so as to be displaceable along the axial direction; and a coil part provided in the main body part and fixed to the main body part, wherein the movable element is arranged in the axial direction Both end portions along the first are the first A movable shaft body is elastically supported by a spring member and the second plate spring member, a first yoke, a permanent magnet held by the movable shaft member, and have a second yoke, the second plate spring member Is fixed to the ceiling surface of the housing with a screw member, the axis of the screw member is set to be located on the inner diameter side of the maximum outer diameter of the movable element, and the second yoke is the movable shaft body And an annular portion extending substantially parallel to the axial direction of the movable shaft body, the umbrella portion from the center of the movable shaft body A thin-walled portion that is gradually thinned toward the outer diameter side is formed, and the outer-diameter side of the thin-walled portion where the umbrella portion and the annular portion are continuous is in the axial direction of the screw member. and arranged opposite to said Rukoto.

  According to the present invention, an exciting force (propulsive force) is generated by energizing the coil portion fixed in the main body, and the movable shaft, the first yoke, the second yoke, and the permanent magnet are included by the exciting force. The movable element is displaced along the axial direction of the movable shaft body. As a result, the excitation force based on the displacement of the movable element is transmitted to the vibration isolation target member via the main body, and for example, vibrations that cause problems in the vehicle body or the like are reduced actively or in an offset manner.

In the present invention, in the assembling step, before the housing is assembled to the base body, the second leaf spring member can be fixed to the ceiling surface of the housing with a screw member in advance, and the outer diameter of the movable element can be reduced. The second leaf spring member can be easily fixed to the housing without being obstructed. As a result, in the present invention, it is not necessary to provide a space for fixing with a fixing member (for example, a conventional fixing ring) on the outer peripheral side (outer diameter side) of the movable element, and the disk is formed in a disk shape. Since the outer diameter of the second leaf spring member can be reduced as compared with the conventional one, a reduction in the outer diameter of the housing can be achieved.

  In the present invention, a support portion that protrudes by a predetermined length toward the inward side is provided at a substantially central portion along the axial direction of the base body, and the first leaf spring is provided on one surface (for example, the lower surface) of the support portion. By attaching the member and attaching the coil part to the other surface (for example, the upper surface) of the support part, the coil part and the first leaf spring member are respectively attached to both sides (upper and lower) of the support part. They can be arranged separately.

  As a result, in the present invention, the attachment portion of the coil portion inside the base body can be provided in the dead space near the first yoke, improving the layout of the arrangement of the coil portion, and finally from the housing and the base body. It can contribute to the size reduction of the main-body part comprised in the radial direction and an axial direction.

  Further, in the present invention, the opening portion that can be closed by the closing member is formed in the ceiling portion of the housing, and the fixing member that fixes the movable shaft body to the second leaf spring member by inserting the opening portion is provided. The movable shaft body can be easily fixed to the two leaf spring members. As a result, in the present invention, it is possible to reduce the assembly man-hours and reduce the cost.

Furthermore, according to the present invention, a main body portion is constituted by a housing and a base body, a movable element and a coil portion are disposed in the main body portion, and one end side of the movable shaft body constituting the movable element is arranged on the outer peripheral portion. A method of manufacturing an active vibration isolator in which the first plate spring member fixed to the body is elastically supported and the other end of the movable shaft body is elastically supported by a second plate spring member having an outer peripheral portion fixed to the housing. Before attaching the housing to the base body, the second leaf spring member is attached in advance to the ceiling surface of the housing with a screw member, and the housing is assembled to the base body. The fixing member is inserted from the outside to the inside along the opening formed in the housing, and the movable shaft body and the second leaf spring member are inserted by the fixing member. It is preferable to be fixed.

In the present invention, by using such an assembling step, the second leaf spring member can be fixed to the ceiling surface of the housing with a screw member in advance before the housing is assembled to the base body. Therefore, the second leaf spring member can be easily fixed to the housing without being obstructed by the outer diameter of the movable element, and a reduction in the outer diameter of the housing can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the outer diameter of a main-body part, the active vibration isolator which can be assembled | attached easily and can improve an assembly | attachment property, and its manufacturing method can be obtained.

1 is a schematic exploded perspective view of a vibration damping device that functions as an active vibration damping device according to an embodiment of the present invention. It is a longitudinal cross-sectional view along the axial direction of the said damping device. FIG. 3 is a partially enlarged longitudinal sectional view of FIG. 2. It is a principal part exploded longitudinal cross-sectional view of a movable mechanism. The permanent magnet is shown, (a) is the perspective view, (b) is a top view, (c) is sectional drawing which shows a magnetization direction. (A) And (b) is a longitudinal cross-sectional view explaining the state which press-fits a 2nd yoke with respect to an assembly, (c) is the C section expanded sectional view of (b). (A) And (b) is a longitudinal cross-sectional view which shows the assembly | attachment process of the said damping device. (A) And (b) is a longitudinal cross-sectional view which shows the assembly | attachment process of the said damping device. (A) And (b) is a longitudinal cross-sectional view which shows the other assembly | attachment process of the said damping device. (A) is explanatory drawing which showed the flow of the magnetic flux which generate | occur | produces in this embodiment, (b) is explanatory drawing which showed the flow of the magnetic flux which generate | occur | produces in a comparative example.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a schematic exploded perspective view of a vibration damping device that functions as an active vibration damping device according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view along the axial direction of the vibration damping device.

  As shown in FIGS. 1 and 2, the vibration damping device 10 includes a lower base body 12 and an upper housing 14, and the base body 12 and the housing 14 are integrally coupled. The main body is configured.

  That is, one end portion on the upper side of the base body 12 formed in a substantially cylindrical shape with both end portions along the axial direction opened to the opening side end portion of the bottom portion of the housing 14 formed in a bottomed cylindrical shape. They are fitted and arranged integrally. Note that a sealing member 16a is provided at a joint portion between the base body 12 and the housing 14 via an annular groove, and the inside of the housing 14 and the base body 12 is suitably sealed by the sealing member 16a. Further, the housing 14 is formed with a notch 20 that functions as a relief of a coupler 18 described later.

  The base body 12 on the lower side is formed of a substantially cylindrical body having a substantially circular opening on each of the upper and lower surfaces, and is a large-diameter bolt member that is inserted into the hole 12b of the mounting portion 12a that protrudes radially outward from the outer peripheral surface. For example, it is fixed to a vibration isolation target member 24 such as an engine frame or a body frame of an automobile via 22a. The upper housing 14 is formed of a bottomed cylindrical body having a ceiling portion 14e on the upper side, and a substantially circular opening 14a is formed at the center of the ceiling portion 14e of the housing 14.

  As shown in FIG. 2, the opening 14a of the housing 14 is provided so as to be able to be closed by a closing member 26 screwed into the threaded portion, and in an annular groove formed in the vicinity of the opening 14a. A seal member 16b is attached and is preferably sealed between the flange 26a of the closing member 26 and the upper surface of the housing 14. A stopper rubber 27 is attached to the bottom surface of the central portion of the closing member 26 to abut the head of a second fixing member 48b, which will be described later, and regulate the upper position. In FIG. 1, the closing member 26 and the seal member 16b are omitted, and the opening 14a of the housing 14 is exposed.

  The lower outer peripheral surface of the housing 14 is provided with a plurality of (for example, four) bulging portions 14b bulging along the radial direction, and a set of different diameters formed on the bulging portion 14b. A pair of bolt members 22b and 22c having different diameters are respectively screwed into the screw holes 14c and 14d. The pair of bolt members 22b and 22c having different diameters are respectively attached from the bottom to the top of the pair of screw holes 14c and 14d.

  In the space portion closed by the lower base body 12 and the upper housing 14, a lower first leaf spring member 28 b and an upper second leaf spring member 28 b extending substantially in the horizontal direction are provided. Due to the spring force, the movable mechanism (movable element) 30 is provided so as to be capable of being displaced in the vertical direction.

  The second leaf spring member 28b is fixed to the ceiling surface (inner wall) 14f of the housing 14 by a screw member 32a, while the first leaf spring member 28a is a disc protruding inward from the base body 12. It is fixed to the lower surface of the shaped support part (support part) 34 (described later) by a screw member 32b. Further, the fixing position (the axial position of the screw member 32a) of the second leaf spring member 28b fixed to the ceiling surface 14f of the housing 14 by the screw member 32a is the maximum outer diameter of various components of the movable mechanism 30 described later. By setting the inner diameter side more than the inner diameter, the outer diameter of the housing 14 can be reduced.

FIG. 3 is a partially enlarged longitudinal sectional view of FIG. 2, and FIG. 4 is an exploded longitudinal sectional view of a main part of the movable mechanism.
The movable mechanism 30 extends in the vertical direction, and is a cylindrical movable that is disposed in the vertical direction between the lower first plate spring member 28a and the upper second plate spring member 28b. A shaft body 36 is provided, and in the axial direction of the movable shaft body 36, a first yoke 38, a permanent magnet 40, and a second yoke 42 are sequentially arranged from the bottom to the top.

  In this case, the head (upper part) of the movable shaft body 36 has a locking portion 36a formed with a diameter increased by a predetermined length compared to other portions, and the first yoke 38 and the locking portion 36a are used. The upper position of the permanent magnet 40 is restricted. Further, an elastic member 44 such as a disc spring is mounted on the outer peripheral surface of the movable shaft 36 on the lower side of the first yoke 38, and the first yoke 38 and the permanent magnet 40 are moved by the elastic member 44 to the movable shaft. It is provided so as to be pressed (biased) toward the upper side of the body 36 (the locking portion 36a). Further, a locking member 46 made of, for example, a C clip or the like is locked (attached) to the annular groove 36 b formed on the outer peripheral surface of the movable shaft body 36, and the first yoke 38 and the permanent member are permanently attached by the locking member 46. The first yoke 38 and the permanent magnet 40 are integrally held with respect to the movable shaft 36 by preventing the magnet 40 from falling downward.

  Screw portions are respectively provided on the lower side and the upper side of the through-hole 36c along the axial direction of the movable shaft body 36 formed in a cylindrical shape. A bolt-shaped first fixing member 48a is screwed into the screw portion on the lower side of the movable shaft body 36, and a support rubber elastic body 50, a ring-shaped spacer 52, a second spacer, which will be described later, are inserted through the first fixing member 48a. One leaf spring member 28 a is integrally fixed (fastened) to the movable shaft 36. Further, as will be described later, a bolt-shaped second fixing member (fixing member) 48b inserted through the opening 14a of the housing 14 is screwed into the screw portion on the upper side of the movable shaft body 36, The second leaf spring member 28b and the second yoke 42 are integrally fixed (fastened) to the movable shaft body 36 via the second fixing member 48b.

  As shown in FIG. 4, the first yoke 38 has a substantially disc shape, and has a through hole 38 a through which the movable shaft body 36 penetrates in the center, and an annular inclined surface in the lower portion on the outer diameter side. A tapered surface 38b that prevents the generation of leakage magnetic flux is formed. This will be described in detail later.

FIG. 5 shows a permanent magnet, FIG. 5 (a) is a perspective view thereof, FIG. 5 (b) is a plan view, and FIG. 5 (c) is a sectional view showing a magnetization direction. .
As shown in FIG. 5 (a), the permanent magnet 40 has a substantially annular shape as a whole, and has a through hole 40a through which the movable shaft 36 penetrates at the center, and an upper surface and a lower surface along the axial direction. The opposite magnetic poles are magnetized.

  As shown in FIG. 5B, the permanent magnet 40 is composed of a half structure divided into two substantially semicircular shapes. The half structure is, for example, a nonmagnetic material such as SUS (JIS). It is stored and arranged in a ring shape in a bottomed cylindrical holder 54 formed of a material. For example, a disc-shaped cover member 56 made of a magnetic material such as iron is fitted into the upper opening of the holder 54 to hold the permanent magnet 40. As the magnetization direction of the permanent magnet 40 (see the arrow in FIG. 5C), for example, by magnetizing the upper surface along the axial direction as the S pole and the lower surface as the N pole, respectively, The poles (upper surfaces, lower surfaces) repel each other and are suitably stored on the inner peripheral surface of the bottom of the holder 54.

  The permanent magnet 40 is not limited to the divided structure as described above. For example, the permanent magnet 40 made of a single annular body may be used by omitting the holder 54 and the cover member 56. Further, the permanent magnet 40 made of an annular body as a whole shape is not limited to two divisions, and a plurality of arbitrarily divided permanent magnets may be accommodated in a ring in the holder 54. Further, the material of the permanent magnet 40 may be, for example, any of an alloy system, a ferrite system, a rare earth samarium-cobalt (Sm—Co) system, and a rare earth neodymium (Nd—Fe—B) system.

  The second yoke 42 is formed of a substantially bottomed cylindrical body, and has an umbrella portion 42a whose diameter increases from the center of the movable shaft body 36 toward the radially outward direction, and an axial direction of the movable shaft body 36 that is continuous with the umbrella portion 42a. , And an annular portion 42b that extends substantially parallel to the axis of the movable shaft body 36. The umbrella portion 42a is formed so that the thickness gradually decreases from the center portion toward the outer diameter side. Further, the annular portion 42b is provided so as to be separated from the first yoke 38 and the permanent magnet 40 by a predetermined length along the radial direction and to surround the coil portion 58 described later.

  In other words, the locking portion 36a having an enlarged diameter is formed on the upper portion of the movable shaft body 36, and the locking member 46 is mounted on the lower side of the movable shaft body 36, so that the locking portion 36a and the locking member 46 are mounted. The permanent magnet 40 and the first yoke 38 are sequentially arranged along the axial direction of the movable shaft 36 from the upper locking portion 36a side, and the first yoke 38 and the locking member 46 are arranged. An elastic member 44 that urges (presses) the first yoke 38 upward (permanent magnet 40 side) is disposed between the elastic members 44.

  In this embodiment, the locking portion 36a is integrally bulged with respect to the head of the movable shaft body 36. However, the locking portion 36a is formed separately from the movable shaft body 36 and is movable. You may make it fix to the head of the shaft body 36. FIG. Furthermore, for example, the elastic member 44 and the locking member 46 may be integrally configured by using a clip with a disc spring or the like.

  At the center of the second yoke 42, there is a hole into which a second fixing member 48b to be described later is inserted, and a center hole 42c that is continuous with the hole and into which the locking portion 36a of the movable shaft 36 can be press-fitted. The second yoke 42 and the permanent magnet 40 are closely arranged along the axial direction of the movable shaft body 36 through the central hole portion 42c.

  A disc-like support portion 34 that protrudes inward by a predetermined length is provided on the inner wall of the substantially central portion along the axial direction of the base body 12. The first plate spring member 28a is attached via the screw member 32b, and the coil portion 58 is attached to the upper surface (other surface) of the disk-like support portion 34 via the screw member 32c. The

  That is, the inner wall of the base body 12 is provided with an annular disk-shaped support portion 34 that protrudes by a predetermined length in the substantially horizontal direction on the inner diameter side, and the disk-shaped support portion 34 has an inner wall of the base body 12. The first leaf spring member 28a is fixed to the adjacent outer diameter side via a screw member 32b screwed into the screw hole from the lower side. On the other hand, the coil portion 58 is attached to the inner diameter side of the disc-like support portion 34 close to the movable shaft body 36 via another screw member 32c screwed into the screw hole from above.

  In this embodiment, the disk-like support part 34 that supports the coil part 58 is formed integrally with the base body 12, but the disk-like support part 34 formed separately from the base body 12 is provided. The base body 12 may be fixed with a screw member or the like.

  The coil portion 58 sandwiches, for example, a coil bobbin 60 formed of a non-conductive material such as a resin material, a coil 62 wound around the coil bobbin 60, and an upper end surface and a lower end surface of the coil bobbin 60. A first holding plate 64a and a second holding plate 64b that hold the coil 62 are provided. The first holding plate 64a and the second holding plate 64b may be formed of a nonmagnetic material such as SUS, for example. The coil bobbin 60 may be omitted and the coil 62 having a bobbinless structure may be used.

  The coil 62 is electrically connected to a terminal portion of the coupler 18 exposed to the outside through a lead wire. In this case, a notch portion 42d (see FIG. 1) that functions as a relief for avoiding contact with the thick portion 60a of the coil bobbin 60 is provided at the skirt portion of the annular portion 42b constituting the second yoke 42. It is done.

  On the lower side of the first leaf spring member 28a, the inner diameter surface is integrally vulcanized and bonded to the first metal fitting 66a, and the outer diameter surface is integrally vulcanized and bonded to the second metal fitting 66b. Is provided. The first metal fitting 66a is formed by a substantially bottomed cylindrical body, and the second metal fitting 66b is formed by an annular band.

  In this case, the first metal fitting 66a on the inner diameter side of the support rubber elastic body 50 is screw-fastened by the first fixing member 48a fastened to the lower end portion of the movable shaft body 36 with the ring-shaped spacer 52 interposed therebetween. The second metal fitting 66 b on the outer diameter side of the rubber elastic body 50 is fixed to the inner wall of the base body 12 by the lid member 68. A stopper portion 50a that abuts against the lid member 68 and regulates the lower position is provided at the lower portion on the inner diameter side of the support rubber elastic body 50 adjacent to the first metal fitting 66a.

  The lid member 68 is fixed to the bottom of the base body 12 by a bolt member 22c screwed from below. A sealing member 16c is attached to a joint portion between the lid member 68 and the base body 12 via an annular stepped portion, and it is preferable that rainwater or the like enter the base body 12 and the housing 14 by the sealing member 16c. Be blocked.

  The vibration damping device 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

First, the assembly process of the movable mechanism 30 will be described.
As shown in FIG. 4, the cover member 56, the permanent magnet 40, the holder 54, the first yoke 38 and the elastic member 44 are respectively connected from the lower end where the engaging portion 36a of the movable shaft 36 is not formed. After being sequentially inserted along the axial direction of the movable shaft body 36, for example, a locking member 46 made of a C clip is mounted (locked) in an annular groove 36b formed on the outer peripheral surface of the movable shaft body 36. An assembly is configured.

  In this case, the cover member 56, the permanent magnet 40, and the like inserted along the axial direction of the movable shaft body 36 are in contact with the engaging portion 36a of the movable shaft body 36 and the upper limit position thereof is restricted, and the elastic member The first yoke 38 is biased in the direction in which the first yoke 38 comes into close contact with the permanent magnet 40 side by the pressing force (spring force) of 44. In addition, in a state where the respective elements are connected and assembled along the axial direction of the movable shaft body 36, different magnetic poles are magnetized along the axial direction of the permanent magnet 40, respectively.

  6 (a) and 6 (b) are longitudinal sectional views for explaining a state in which the second yoke is press-fitted into the assembly body assembled in this way, and FIG. 6 (c) is a diagram of FIG. It is the C section expanded sectional view of (b).

  As shown in FIGS. 6A and 6B, the central hole portion 42c of the second yoke 42 is connected to the engaging portion 36a of the movable shaft body 36 constituting the assembly by the movable shaft body 36. Press fit along the axial direction. In this case, the press-fitting in the axial direction is restricted by the end surface of the movable shaft body 36 coming into contact with the annular stepped portion formed in the central hole 42c. When the second yoke 42 is press-fitted into the movable shaft body 36, the permanent magnet 40 is magnetized. However, since the upper position of the cover member 56 is restricted by the locking portion 36a of the movable shaft body 36, Sticking to the two-yoke 42 side is prevented. For this reason, assembly property can be made favorable.

  The cover member 56 serves as a pressing member for the permanent magnet 40. However, since the cover member 56 is made of a magnetic material, it prevents the magnetic flux from flowing between the second yoke 42 and the permanent magnet 40 as much as possible. Yes. Further, since the outer peripheral portion of the cover member 56 is fitted and arranged on the inner periphery of the upper opening of the holder 54, the second yoke 42 is press-fitted into the movable shaft body 36 and the cover member 56 in the second yoke 42. When the opposed portion of the second yoke 42 comes into contact with the cover member 56 and reaches the press-fitting restriction position in the second yoke 42, the second yoke 42, the cover member 56, the permanent magnet 40, the holder 54, and the first yoke 38 are elastic members. Each is arranged in close contact by the pressing force (spring force) of 44. As a result, each of the elements constituting the movable mechanism 30 is closely arranged along the axial direction of the movable shaft 36, so that the magnetic efficiency can be improved.

  As shown in FIG. 6C, the outer peripheral edge 40 b of the permanent magnet 40 is chamfered in an R shape, but by providing a cover member 56 that is fitted into the opening of the holder 54, the movable shaft 36 is provided. The cover member 56 can be locked by a slight annular step 36d formed in the above. As a result, as will be described later, it is possible to suppress the decrease in the effective area through which the magnetic flux flows in the second yoke 42 as much as possible. The permanent magnet 40 may be magnetized after the second yoke 42 is press-fitted into the movable shaft 36.

7 to 9 are longitudinal sectional views showing the assembly process of the vibration damping device 10.
First, as shown in FIG. 7A, the first leaf spring member 28a is fixed to the disk-like support portion 34 of the base body 12 via a screw member 32b screwed from below, The coil part 58 is fixed via the other screw member 32c screwed in. Subsequently, the assembly of the movable mechanism 30 including the second yoke 42 is inserted from above, and the lower end portion along the axial direction of the movable shaft 36 constituting the movable mechanism 30 is placed on the upper surface of the first leaf spring member 28a. Support by abutting.

  Next, as shown in FIG. 7 (b), the housing 14 provided with the second leaf spring member 28b fixed to the ceiling surface 14f by the screw member 32a in advance is fitted to the base body 12, and the bolt The housing 14 and the base body 12 are integrally fastened by the member 22b.

  That is, before the housing 14 is assembled to the base body 12, the second leaf spring member 28 b is attached to the ceiling surface 14 f of the housing 14 with the screw member 32 a in advance, and the housing 14 is attached to the base body 12. When the second fixing member 48b is inserted from the outside along the opening 14a formed in the housing 14, the movable shaft 36 and the second leaf spring member 28b are inserted by the second fixing member 48b. Then, the housing 14 and the base body 12 are integrally fastened by the bolt member 22b.

  Further, as shown in FIG. 7B, the second fixing member 48 b is inserted into the housing 14 along the opening 14 a formed in the ceiling 14 e of the housing 14 and not yet closed by the closing member 26. Thereafter, as shown in FIG. 8A, the second fixing member 48b is screwed into the screw portion on the upper side of the movable shaft 36 so that the upper end side of the movable mechanism 30 is moved to the second leaf spring member 28b ( Spring force). Further, as shown in FIG. 8A, the first fixing member 48a is screwed into the lower screw portion of the movable shaft body 36 from below, so that the supporting rubber elastic body 50 and the spacer 52 are interposed. The first leaf spring member 28 a is simultaneously fastened to the lower side of the movable shaft body 36.

  Subsequently, as shown in FIG. 8B, the lid member 68 is attached to the bottom of the base body 12 via the screw member 22c, and the opening 14a of the housing 14 is closed by the closing member 26. Then, the assembly work of the vibration damping device 10 is completed.

  9 (a) and 9 (b), the cross bolt 70 is used by using a cross bolt 70 and a nut 72 provided with screw portions 70a, 70b at both ends along the axial direction. One screw portion 70a is screwed into the lower screw portion of the movable shaft body 36 to fix the first leaf spring member 28a first, and then the other screw portion 70b of the cross bolt 70 is fitted with a nut 72. May be fastened to fix the support rubber elastic body 50. In this case, the other threaded portion 70 b of the cross bolt 70 functions as an elastic body attaching portion for attaching the supporting rubber elastic body 50.

  In the present embodiment, when the coil 62 is energized from a power supply device (not shown) through the coupler 18, the permanent magnet 40, the first yoke 38, and the second yoke 42 are formed as shown in FIG. As a current flows in the magnetic path formed, that is, in the coil 62 arranged in the magnetic field, Lorentz force acts on the fixed coil 62 (Fleming's left-hand rule), and the reaction force An exciting force is generated in the movable mechanism 30.

  In the present embodiment, an excitation force (propulsion force) is generated by energizing the coil 62, and the excitation force includes the movable shaft body 36, the first yoke 38, the second yoke 42, the permanent magnet 40, and the like. The mechanism 30 is displaced along the axial direction of the movable shaft body 36. As a result, the excitation force based on the displacement of the movable mechanism 30 is transmitted to the vibration isolation target member 24 through the housing 14 and the base body 12, and, for example, vibrations that cause problems in the vehicle body or the like are actively or cancelled. Reduced to

  On the other hand, as shown in FIG. 10 (b), as movable elements, an inner yoke and an outer yoke that are externally fitted to a movable shaft, and a cylindrical permanent magnet that is mounted on the annular step portion of the inner yoke, On the other hand, in a comparative example having a coil fixed to the apparatus main body side, a cylindrical permanent magnet fitted on the inner yoke forms a different magnetic pole between the inner diameter surface and the outer diameter surface. In the inner yoke disposed on the inner diameter side of the permanent magnet by the magnetized in the radial direction (see the arrow in the magnetizing direction), the magnetic flux generated by the permanent magnet and the magnetic flux generated by energizing the coil Magnetic saturation is caused (refer to the magnetic saturation part), and the magnetic loss in the magnetic path is increased, which may make it difficult to improve the magnetic thrust, that is, the excitation force applied to the movable element.

  In other words, in the comparative example shown in FIG. 10B, since the inner yoke is disposed on the inner diameter side of the permanent magnet, the generated magnetic flux circulates from the permanent magnet → the inner yoke → the outer yoke → the coil, so that It may be difficult to set a large magnetic path area between the magnet and the inner yoke, which may lead to magnetic saturation.

  The current (or voltage) supplied to the coil 62 may be an alternating current controlled corresponding to the frequency of the vibration in question or a direct current that is on / off controlled at a predetermined cycle. As described above, the vibration damping device 10 according to the present embodiment functions as a dynamic vibration damping device by the movable mechanism 30 functioning as a mass member that can be displaced with respect to the vibration isolation target member 24.

  In the present embodiment, for example, an active type vibration damping device that is directly attached to the vibration isolation target member 24 such as a vehicle body and directly reduces the vibration applied to the vibration isolation target member 24. Although the case where it applies to the apparatus 10 is illustrated, it is not limited to this, For example, as shown also in FIG. 1 of Unexamined-Japanese-Patent No. 2004-293602, between the members of a vibration transmission system Of course, the present invention can be applied to the active vibration isolation mount (active control mount; ACM).

  In the present embodiment, in the assembling process of the vibration device, as shown in FIG. 7B, before the housing 14 is assembled to the base body 12, the screw member 32a is used in advance with respect to the ceiling surface 14f of the housing 14. Since the second leaf spring member 28b is fixed, the outer diameter of the movable element (movable mechanism 30) (for example, the outer diameter of the annular portion 42b of the second yoke 42 having the maximum outer diameter in the movable mechanism 30) is set. The second leaf spring member 28b can be easily fixed without being obstructed.

  As a result, in this embodiment, it is not necessary to provide a space for fixing with a fixing member (for example, a conventional fixing ring) on the outer peripheral side (outer diameter side) of the movable element. Since the outer diameter of the second leaf spring member 28b can be reduced as compared with the conventional one, a reduction in the outer diameter of the housing 14 can be achieved.

  Further, in the present embodiment, the lower first plate spring member 28 a is fixed to the disk-like support portion 34 of the base body 12, and the upper second plate spring member 28 b is fixed to the ceiling surface 14 f of the housing 14. Since the first and second leaf spring members 28a and 28b are separately attached to the two members of the base body 12 and the housing 14, both end portions along the axial direction of the movable element are elastically supported. Can be easily performed.

  As a result, in the present embodiment, the coil portion 58 is movable between the outer diameter surface of the first yoke 38 (permanent magnet 40) and the annular portion 42b of the second yoke 42 inside the base body 12 and the housing 14. Even in the case where they are arranged close to each other, both end portions along the axial direction of the movable element can be elastically supported by the first and second leaf spring members 28a and 28b without sliding.

  Further, in the present embodiment, a disc-like support portion 34 that protrudes by a predetermined length toward the inward side is provided at a substantially central portion along the axial direction of the base body 12, and one surface of the disc-like support portion 34. The first leaf spring member 28a is attached to the (lower surface) and the coil part 58 is attached to the other surface (upper surface) of the disk-like support portion 34, whereby both side portions (upward) And the lower part), the coil part 58 and the first leaf spring member 28a can be separately arranged.

  As a result, in the present embodiment, the attachment portion of the coil portion 58 inside the base body 12 can be provided in the dead space below the first yoke 38, improving the layout of the arrangement of the coil portion 58, and ultimately In particular, it is possible to contribute to miniaturization of the housing 14 and the base body 12 in the radial direction and the axial direction.

  Furthermore, in this embodiment, the opening 14a that can be closed by the closing member 26 is formed in the ceiling 14e of the housing 14, and the opening 14a is inserted through the movable shaft as shown in FIG. 7B. By providing the second fixing member 48b for fixing the body 36 to the second leaf spring member 28b, the movable shaft body 36 can be easily fixed to the second leaf spring member 28b. As a result, in the present embodiment, it is possible to reduce the assembly man-hour and reduce the cost.

10 Vibration control device (active vibration isolation device)
12 Base body (main part)
14 Housing (main part)
14a Opening part 14e Ceiling part 14f Ceiling surface 24 Anti-vibration object member 26 Closure member 28a First leaf spring member 28b Second leaf spring member 30 Movable mechanism (movable element)
34 Disc-shaped support (support)
36 movable shaft body 38 first yoke 40 permanent magnet 42 second yoke 48b second fixing member (fixing member)
58 Coil section

Claims (4)

An active vibration isolator that actively suppresses vibration of a vibration isolation target member,
A substantially cylindrical base body provided on the lower side and opened at both ends along the axial direction; and a main body configured by integrally coupling a bottomed cylindrical housing provided on the upper side;
A first leaf spring member provided on one side along the axial direction in the main body and fixed to the inside of the base body;
A second leaf spring member provided on the other side along the axial direction in the main body and fixed to the ceiling surface of the housing;
A movable element elastically supported by the first leaf spring member and the second leaf spring member and assembled so as to be displaceable along the axial direction;
A coil part provided in the main body part and fixed to the main body part;
With
The movable element includes a movable shaft body elastically supported at both ends along the axial direction by the first plate spring member and the second plate spring member, a first yoke held by the movable shaft body, and a permanent possess magnet, and a second yoke,
The second leaf spring member is fixed to the ceiling surface of the housing with a screw member, and the axis of the screw member is set to be located on the inner diameter side of the maximum outer diameter of the movable element,
The second yoke has an umbrella portion that expands in a radially outward direction from the center of the movable shaft body, and an annular portion that extends substantially parallel to the axial direction of the movable shaft body,
The umbrella portion is formed with a thin portion that gradually becomes thinner from the center of the movable shaft toward the outer diameter side,
An outer diameter side of the thin portion and the umbrella portion and the annular portion are continuous, active vibration isolating device according to claim Rukoto arranged opposite said threaded member in the axial direction of the screw member. The active vibration isolator according to claim 1,
A substantially central portion along the axial direction of the base body is provided with a support portion that protrudes inward by a predetermined length, and the first leaf spring member is attached to one surface of the support portion. The active vibration isolator is characterized in that the coil portion is attached to the other surface of the support portion. The active vibration isolator according to claim 1 or 2,
An opening that can be closed by a closing member is formed in a ceiling portion of the housing, and a fixing member that is inserted through the opening and fixes the movable shaft body to the second leaf spring member is provided. Active vibration isolator. A main body is constituted by the housing and the base body, a movable element and a coil part are disposed in the main body, and one end side of the movable shaft constituting the movable element is fixed to the base body at an outer peripheral portion. A method of manufacturing an active vibration isolator which is elastically supported by a leaf spring member and is elastically supported by a second leaf spring member having an outer peripheral portion fixed to a housing at the other end side of the movable shaft body,
Attaching the second leaf spring member to the ceiling surface of the housing with a screw member before assembling the housing to the base body;
When the housing is assembled to the base body, a fixing member is inserted from the outside to the inside along an opening formed in the housing, and the movable shaft body and the second leaf spring member are moved by the fixing member. Fixing, and
A method of manufacturing an active vibration isolator characterized by comprising:

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