JP5733025B2 - Linear actuator - Google Patents

Description

  The present invention provides a linear spring including a leaf spring that supports an inner core and an outer core that are provided inside and outside in the radial direction so as to have the same axial center, and elastically supports the outer core so as to reciprocate in the axial direction with respect to the inner core. It relates to an actuator.

  Conventionally, there are many types of linear actuators that reciprocate a mover in one direction with respect to a stator by the action of magnetism. Among them, a linear actuator having a configuration shown in Patent Document 1 below is known.

  This is a type called an outer movable type in which the mover is arranged outside the stator, and the outer core as the mover has the same axial center as the outer core as the stator. In addition, a permanent magnet is provided outside the inner core, and a magnetic pole part is provided inside the outer core. The permanent magnet and the magnetic pole part are placed close to each other with a certain distance therebetween, and the magnetic field formed between them is electrically The outer core is reciprocated in the direction of the axial center by being controlled and changed.

  The configuration of the linear actuator will be described in detail. The inner core is supported in the radial direction of the shaft by a shaft that passes through a through hole provided in the shaft center, and the outer periphery of the shaft is sandwiched between the inner core and the inner core. A pair of leaf springs is provided, and the outer core is elastically supported with respect to the axial direction of the shaft by being connected from the front surface and the rear surface by the pair of leaf springs. The leaf spring is formed in an “8” shape when viewed from the axial direction of the shaft, and a through hole is provided at the central intersection, and the shaft is simultaneously inserted into the through hole provided in the inner core and the through hole. As a result, the inner core and the leaf spring are arranged coaxially, and the outer core connected to the leaf spring can also be arranged coaxially with the inner core.

  In addition, a large-diameter portion that cannot pass through the through hole is formed on one end portion side of the shaft, and a male screw is formed on the other end portion side, and the leaf spring and the inner core are formed as described above. The position of the leaf spring or the inner core can be fixed with respect to the shaft by screwing the nut after inserting the through hole.

  In such a linear actuator, it is important to maintain a predetermined gap while appropriately facing the permanent magnet and the magnetic pole portion in order to maintain the characteristics as the linear actuator. For this purpose, the positions of the inner core and the outer core are determined. Various techniques for regulating the relationship have been proposed.

  For example, in Patent Document 1 described above, a groove portion is provided on the outer periphery of the leaf spring and a shaft portion is provided on the outer core, and the positional relationship between the leaf spring and the outer core is regulated by engaging the groove portion and the shaft portion. Indirectly, the positional relationship between the outer core and the inner core is regulated.

  Moreover, in patent document 2, while forming a shaft into a polygonal shape and making the through-hole of an inner core and a leaf | plate spring corresponding to this in a polygonal shape, the circle | round | yen between an inner core and a leaf | plate spring via a shaft is formed. The positional deviation in the circumferential direction is suppressed. Thereby, the positional relationship between the inner core and the outer core is also indirectly regulated.

  Further, in Patent Document 3, when the inner core and the outer core are relatively displaced in the radial direction, the inner core and the outer core are contacted to function as a stopper by contacting the permanent magnet and the magnetic pole portion before contacting each other. It is formed between. The contact portion also regulates the positional relationship between the inner core and the outer core during operation.

JP 2010-226874 A JP 2010-279161 A JP 2010-104126 A

  However, if a shaft formed in a columnar shape as in Patent Document 1 or Patent Document 3 is used and the shaft is inserted into a through hole of a leaf spring or an inner core and a nut is screwed onto the tip, the nut is given. The rotational force acts on the leaf spring, and the position of the leaf spring may shift in the circumferential direction with respect to the inner core.

  When a positional deviation occurs between the outer core and the inner core as described above, the magnetic field characteristics change due to a change in the positional relationship between the magnetic pole portion provided in the outer core and the permanent magnet provided in the inner core, and the linear actuator As a result, there is a problem that the operating characteristics change.

  In order to prevent such misalignment, it may be possible to carefully assemble while using a dedicated assembly jig. However, the manufacturing cost of the jig increases and the number of assembly steps increases, resulting in an increase in equipment cost. There is a fear.

  Furthermore, even if the assembly can be performed so that there is no circumferential displacement between the outer core and the inner core, the nut loosens due to vibration during driving, or there is a load in the circumferential direction from the outside. As a result, positional deviation gradually occurs in the circumferential direction, and the characteristics may change. In addition, when such a circumferential misalignment occurs, the outer core and the inner core may come into contact with each other to cause damage.

  As means for solving these problems, the shaft is made into a polygonal shape as in Patent Document 2, or a leaf spring or an inner core is provided after partially providing a key or a flat portion while keeping the shaft in a cylindrical shape. It is also conceivable to suppress the positional deviation in the circumferential direction by adopting shapes corresponding to these. However, such processing may lead to an increase in the size of the apparatus and an increase in manufacturing costs.

  An object of the present invention is to effectively solve such a problem. Specifically, the inner core and the outer core are not misaligned in the circumferential direction, have stable characteristics, are easy to assemble, and are compact. It is an object to provide a linear actuator that is inexpensive and inexpensive.

  In order to achieve this object, the present invention takes the following measures.

That is, the linear actuator of the present invention has an inner core, a pair of leaf springs provided so as to sandwich the inner core from the front and rear in the axial direction, and the same axial center as the inner core while being supported by the pair of leaf springs. And an outer core provided radially outward of the inner core, wherein one of the inner core and the outer core is provided with a permanent magnet, and the other of the inner core and the outer core is fixed with the permanent magnet. The magnetic poles that are opposed to each other are formed, and spacers are provided between the inner cores and the plate springs, the spacers and the inner cores, and the spacers and the plates adjacent to the spacers. Each of the opposing surfaces of the spring is contacted in the axial direction to form each contact portion, and the contact portion A recess formed on one of the opposing surfaces forming, are each have a plurality provided, protrusions and recesses constituting the engaging portion of the engaging portion comprising a convex portion formed on the other of said contact portion, The inner core, the leaf spring, and the spacer are formed by laminating steel plates, each of which is constituted by a caulking protrusion and a caulking hole, and is fixed to each other by pressing in the axial direction in a state where these are engaged. The caulking protrusion and the caulking hole are formed in a part of each steel plate .

  With this configuration, the inner core, the spacer, and the leaf spring are combined in the axial direction while engaging the concave portions and the convex portions provided on the opposing surfaces, so that the relative position is determined and the circumferential positional deviation is determined. It can be prevented from occurring. Therefore, the relative position of the outer core and the inner core supported by the leaf springs is shifted in the circumferential direction from assembly to use without using a specially processed shaft for forming a keyway, a flat surface, or the like. In addition, the magnetic pole part and the permanent magnet can be appropriately opposed to each other, and contact between components inside can be prevented. As a result, it is possible to provide a low-cost linear actuator that exhibits stable characteristics without causing a reduction in efficiency or failure.

Further, the convex portion and the concave portion constituting the engaging portion are constituted by caulking protrusions and caulking holes, and the positions are fixed to each other by pressing in the axial direction in a state where these are engaged. Therefore, the assembly can be facilitated and a strong fastening force can be generated at the engaging portion after the assembly. In addition, the inner core, the leaf spring, and the spacer are each formed by laminating steel plates, and the caulking protrusion and the caulking hole are formed in a part of each steel plate. The respective engaging portions can be configured easily, and each component having these engaging portions can be easily manufactured.

The linear actuator of the present invention has an inner core, a pair of leaf springs provided so as to sandwich the inner core from the front and rear in the axial direction, and the same axis as the inner core while being supported by the pair of leaf springs. And an outer core provided on the radially outer side of the inner core, wherein one of the inner core and the outer core is provided with a permanent magnet, and the other of the inner core and the outer core is provided with the permanent magnet and a predetermined magnet. The inner core and the pair of leaf springs are each formed with a through hole at the same axial center and are closely inserted into each through hole. The shaft is closely fitted to the outer periphery of the shaft and is disposed between the inner core and the leaf springs. Each of the spacers and the inner core, and each of the opposing surfaces of the leaf springs adjacent to the spacers in the axial direction constitutes a contact portion. An engaging part consisting of a concave part formed on one of the opposing surfaces constituting the contact part and a convex part formed on the other side is provided at least in one place on the contact part, and the convex part constituting the engaging part And the recesses are constituted by caulking projections and caulking holes, and the positions thereof are fixed to each other by pressing in the axial direction in a state in which these are engaged, and the inner core, the leaf spring, and the spacer are laminated with steel plates, respectively. The caulking protrusion and the caulking hole are formed in a part of each steel plate.

With this configuration, the inner core, the spacer, and the leaf spring are fitted on the outer periphery of the shaft, and the concave and convex portions provided on the respective opposing surfaces are simply engaged to determine the relative position in the circumferential direction. Misalignment does not occur. For this reason, as described above, the relative position between the outer core and the inner core supported by the leaf springs does not shift in the circumferential direction from assembly to use without special processing on the shaft, and the While being able to make a magnet oppose appropriately, the contact between components inside can be prevented. As a result, it is possible to provide a low-cost linear actuator that exhibits stable characteristics without causing a reduction in efficiency or failure.

Further, the convex portion and the concave portion constituting the engaging portion are constituted by caulking protrusions and caulking holes, and the positions are fixed to each other by pressing in the axial direction in a state where these are engaged. Therefore, the assembly can be facilitated and a strong fastening force can be generated at the engaging portion after the assembly. In addition, the inner core, the leaf spring, and the spacer are each formed by laminating steel plates, and the caulking protrusion and the caulking hole are formed in a part of each steel plate. The respective engaging portions can be configured easily, and each component having these engaging portions can be easily manufactured.

Furthermore, in order to reduce the number of parts and facilitate parts management and assembly, the spacer
Preferably, at least one of the inner core and the inner core are configured integrally.

  Furthermore, in order to further reduce the manufacturing cost of the linear actuator having the above-described effect, the permanent magnet is formed in a flat plate shape, and the facing surface of the magnetic pole portion facing the permanent magnet is formed flat. It is still more preferable to configure in this way.

As described above, according to the present invention described above, since the positional deviation between the components does not occur while the assembly is easy and simple, the internal permanent magnet and the magnetic pole portion can be appropriately opposed to each other, and the efficiency is reduced. It becomes possible to provide a low-cost linear actuator that exhibits stable characteristics without causing a failure.

1 is a perspective view of a linear actuator according to a first embodiment of the present invention. Sectional drawing of the linear actuator. The exploded perspective view of the linear actuator. The disassembled perspective view of the principal part of the linear actuator. Sectional drawing which shows the assembly method of the principal part of the linear actuator. The disassembled perspective view of the outer core which comprises the linear actuator. The disassembled perspective view of the stopper member which comprises the linear actuator. The disassembled perspective view of the leaf | plate spring which comprises the linear actuator. Sectional drawing and perspective view which show the principal part of the linear actuator. The schematic diagram which shows the form of the crimping part used with the linear actuator. The perspective view which shows the engagement relationship between the components of the linear actuator. Sectional drawing of the linear actuator which concerns on 2nd Embodiment of this invention. The principal part disassembled perspective view which shows the engagement relation between the components of the linear actuator. The disassembled perspective view of the linear actuator which concerns on 3rd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>

  As shown in FIG. 1, the linear actuator of this embodiment includes an inner core 2 that is largely provided inside, an outer core 3 that is provided on the outer periphery of the inner core 2 so as to have the same axis, and the above-described linear actuator. The shaft 6 comprises a shaft 6, a pair of leaf springs 41, 42 that support the outer core 3 on the outer periphery of the shaft 6, and stopper members 51, 52 provided in the front-rear direction of the leaf springs 41, 42, respectively. Has been.

  This configuration will be described in more detail with reference to the central sectional view shown in FIG.

The shaft 6 is formed in a columnar shape extending from the rear end portion 63 on the right side in the drawing toward the front end portion 62 on the left side in the drawing, and a large diameter portion 61 is formed on the right side in the drawing from the center in the longitudinal direction. Yes.
From the end surface 61a of the large diameter portion 61 to the left end portion 62 in the drawing is inserted as an insertion portion 64 into the inner core 2 and the leaf springs 41 and 42. The insertion portion 64 and the large diameter portion 61 are formed coaxially.

  The leaf spring 42, the spacer 72, the inner core 2, the spacer 71, and the leaf spring 41 are sequentially fitted in the insertion portion 64 of the shaft 6, and the disc spring 73 as a spring member and a fixed collar are provided in the vicinity of the distal end portion 62 of the shaft 6. 74 is fitted. Thus, the position of the leaf springs 41 and 42 and the inner core 2 is restricted between the end surface 74 b of the fixed collar 74 and the end surface 61 a of the large diameter portion 61 while being urged in the axial direction by the disc spring 73. It is like that.

  Here, in the description of the present embodiment, the axial direction means the axial direction in the shaft 6, and the radial direction and the circumferential direction mean the radial direction and the circumferential direction in the shaft 6, respectively. It is synonymous with the direction with reference to the third axis, and this definition will be used in the following description unless otherwise specified.

  The inner core 2 is formed of laminated steel plates, and core covers 21 and 22 are provided so as to sandwich the inner core 2 from the front and rear in the axial direction, and coils 25 and 26 are provided outside the core covers 21 and 22. ing. By applying a current to these coils 25 and 26, a vertical magnetic field in the figure can be generated. Further, permanent magnets 23 and 24 are provided above and below the inner core 2, and the permanent magnets 23 and 24 are configured such that different magnetic poles are arranged in the axial direction, respectively, 24, the magnetic poles are arranged in different directions.

  Before and after the inner core 2 in the axial direction, cylindrical spacers 71 and 72 are provided so that one end face is brought into contact with each other to form a contact portion, and the other end face of the spacer 71 and 72 is provided. The plate springs 41 and 42 are provided in contact with each other to form contact portions. The leaf springs 71 and 72 extend to the outer periphery of the inner core 2 and are configured to support the outer core 3 via the guide pins 93.

  The outer core 3 is configured as an upper core 31 and a lower core 32, which are divided into two in the vertical direction in the figure, and are provided so that guide pins 93 and 93 are inserted therethrough, respectively. Positioning is performed in the radial direction via 41 and 42. Further, stopper members 51 and 52 are provided so as to sandwich the outer core 3 in the front and rear in the axial direction, and these are also positioned by the guide pins 93 and 93 in the same manner as the outer core 3. Further, in the state where the respective members are arranged in this manner, the bolts 91 and 91 and the nuts 92 and 92 are fixed in the axial direction.

  The shape and configuration of each part showing the above rough configuration will be described in detail below.

  If the structure between components is demonstrated again using the exploded perspective view shown in FIG. 3, the inner core 2 will be in the state inserted | pinched between the leaf | plate springs 41 and 42 in the axial direction through the spacers 71 and 72, These The inside of the through holes 2a, 41a, 42a is inserted through the insertion portion 64 of the shaft 6, and is configured to have a larger diameter than the disc spring 73 and the through holes 2a, 41a, 42a in the vicinity of the distal end portion 62 of the shaft 6. A fixed collar 74 is fitted. In this manner, the inner core 2 and the leaf springs 41 and 42 are positioned in the radial direction so as to have the same axis as the axis X of the shaft 6 and are positioned in the axial direction.

  Before fitting the outer periphery of the shaft 6 as described above, peripheral parts are attached to the inner core 2 as shown in FIG. The inner cores 2 are each formed of laminated steel plates whose axial direction is the thickness direction, and are integrated by being connected to each other by caulking portions 2j formed on the respective steel plates as will be described in detail later. The front surface 2b and the rear surface 2c in the axial direction are configured as flat surfaces, and a crimping portion 2j is provided as a convex portion in the axial direction on the front surface 2b, and a crimping portion (not shown) is provided as a concave portion in the rear surface 2c. It has been. A through hole 2a is formed in the center from the front surface 2b to the rear surface 2c, and the upper surface 2d and the lower surface 2e are formed so as to be almost close to a curved surface along the circumferential direction. Further, step portions 2f and 2g are formed as escape portions for winding the coils 25 and 26 at positions near the through hole 2a below the upper surface 2d and above the lower surface 2e, respectively.

  The spacers 71 and 72 that contact the inner core 2 so as to sandwich the inner core 2 in the front-rear direction are formed in a cylindrical shape, and caulking portions 71j and 72j are provided on these end surfaces as well as the inner core 2. For this reason, part of the caulking portion provided on the inner core 2 and the caulking portions 71j and 72j of the spacers 71 and 72 are engaged with each other, so that the positions are mutually regulated when pressed in the axial direction. Yes.

  Further, core covers 21 and 22 are provided so as to sandwich the inner core 2 in the axial direction, and almost all of the inner core 2 is covered thereby. The core covers 21 and 22 are provided with opening holes 21a and 22a, respectively. Since the opening holes 21a and 22a are formed larger than the outer diameter of the spacers 71 and 72, the end surfaces 71b of the spacers 71 and 72 are provided. 72c are completely exposed in the axial direction. With the core covers 71 and 72 attached to the inner core 2 in this way, the permanent magnets 23 and 24 are attached from above and below. The permanent magnets 23 and 24 are each configured to have a curved surface that protrudes radially outward, and the inner surfaces 23b and 24b are in contact with the upper surface 2d or the lower surface 2e of the inner core 2 while being guided by the core covers 21 and 22. It is attached in this way. Thus, the outer surfaces 23a and 24a are formed so as to be curved surfaces constituting a part of a cylindrical surface centering on the axis of the through hole 2a in a state of being attached to the inner core 2.

  Further, in a state where the core covers 21 and 22 are attached to the inner core 2, the coil 25 is provided at the positions of the step portions 21b, 21c, 22b and 22c of the core covers 21 and 22 corresponding to the step portions 2f and 2g of the inner core 2. 26 is formed. By applying a current to the coils 25 and 26, the magnetic field formed by the permanent magnets 23 and 24 can be changed.

  After the inner core 2, the core covers 21 and 22, the spacers 71 and 72, the permanent magnets 23 and 24, and the coils 25 and 26 are assembled in advance as described above, the other cores as shown in FIG. The linear actuator 1 is assembled together with the parts.

  Leaf springs 41 and 42 are provided so as to be adjacent to the spacers 71 and 72, respectively. The leaf springs 41 and 42 are connected to the frame portions 41e and 42e formed in a square shape, and the frame portions 41e and 42e in the vertical position in the drawing, and the spring portions 41f and 42f formed in the shape of "8". And ring-shaped attachment portions 41h and 42h provided at the center thereof. By being configured in this manner, the frame portions 41e and 42e can be elastically displaced in the axial direction by the deformation of the spring portions 41f and 42f in a state where the mounting portions 41h and 42h are fixed. Yes. One of the end surfaces of the attachment portions 41h and 42h is positioned in the axial direction so as to contact the spacers 71 and 72. The through holes 41a and 42a provided at the centers of the mounting portions 41h and 42h are arranged coaxially with the through hole 2a of the inner core 2 and the shaft 6 is inserted therethrough. Cutout portions 41b, 41b, 42b, and 42b are formed at the upper and lower positions in the figure of the frame portions 41e and 42e of the leaf springs 41 and 42 so as to be aligned with the center of the through hole 41a. At the time of assembly, the upper core 31 and the lower core 32 are positioned so that the guide pins 93 and 93 are inserted along the notches 41b, 41b, 42b and 42b from above and below in the drawing. . Further, bolt holes 41g to 41g and 42g to 42g are formed at the four corners of the frame portions 41 and 42, and the bolts 91 to 91 are inserted into the portions at the final stage of assembly. .

  Hereinafter, the detailed configuration of the leaf springs 41 and 42 will be described using the leaf spring 42 as an example. As shown in FIG. 8, the plate spring 42 is configured by laminating plate spring steel plates 42 </ b> P <b> 1 to 42 </ b> P <b> 5 formed by punching and connecting them to each other. Each of the leaf spring steel plates 42P1 to 42P5 has the same overall shape, and the formed bolt hole portions 42g1 to g5, the cutout portions 42b1 to b5, and the through hole portions 42a1 to a5 are integrated after being laminated. A single bolt hole 42g, a notch 42b, and a through hole 42a are formed as shown in FIG.

  Each frame portion 42e1 to e5 is provided with twelve crimping portions 42j1 to 42j5 in the circumferential direction, and each of the attachment portions 42h1 to h5 is provided with two crimping portions 42j1 to 42j5 in the left-right direction in the drawing. The caulking portions 42j1 to 42j5 are formed so as to have an inverted V-shaped cross section by pressing, and are convex toward the left in the drawing. Therefore, it has a concave shape of the same shape on the back surface with respect to the convex surface. Therefore, the concave portions and the convex portions can be engaged with each other by aligning the positions of the caulking portions 42j1 to 42j5 having such shapes. Further, by applying a pressing force in the laminating direction with a press or the like in the state where the thin plates are laminated in this way, the caulking portions 42j1 to 42j5 are slightly deformed and the mutual coupling force is strengthened and integrated. Is possible.

  In the present embodiment, the leaf spring 41 shown in FIG. 3 has substantially the same configuration as the leaf spring 42 configured as described above, but has a convex portion on the contact surface with the adjacent disc spring 73. In order not to occur, only the portion is flattened. A specific method for flattening this will be described later.

  The plate springs 41 and 42 configured as described above are arranged so as to sandwich the inner core 2 via the spacers 71 and 72 as shown in FIG. 3, and the shaft 6 is inserted through the centers thereof. As described above, the core covers 21 and 22, the permanent magnets 23 and 24, and the coils 25 and 26 are attached to the inner core 2 in advance.

  When assembled in this way, the configuration is as shown in FIG. With the inner core 2 as the center, the plate spring 41, the spacer 71, the inner core 2, the spacer 72, and the plate spring 42 are arranged in this order from the left in the figure, and each of the through holes 41a, 71a, 2a, The insertion part 64 of the shaft 6 is inserted into the interior of 72a, 42a so that the end surface 61a of the large-diameter part 61 and the leaf spring 41 on the left side in the drawing sequentially contact each other in the axial direction.

  The positional relationship of the engaging portion at the contact portion between the members when assembling in this way will be described with reference to FIG.

  When the inner diameters of the inner core 2, the leaf springs 41 and 42, and the through holes 2 a, 41 a, 42 a, 71 a, and 72 a of the spacers 71 and 72 that are fitted into the insertion portion 64 of the shaft 6 are D 1 to D 5, these inner diameters D 1 To D5 are set so as to have the following relationship with the outer diameter D0 of the shaft insertion portion 64.

  That is, D1, D2, and D3 are substantially equal to D0, and are dimensioned so that the shaft 6 can be inserted smoothly and tightly. Therefore, the inner core 2 and the leaf springs 41 and 42 are restricted in the radial direction only by inserting the shaft 6. On the other hand, D4 and D5 are set to be slightly larger than these to such an extent that no play occurs.

  The inner core 2 has six crimping portions 2j to 2j on the front surface 2b and the rear surface 2c, respectively. The front surface 2b is formed with a convex portion as a crimping protrusion, and the rear surface 2c is formed with a concave portion as a crimping hole. Yes. Of these crimping portions 2j to 2j, two crimping portions 2k1 and 2k2 provided in the vicinity of the through hole 2a act as engaging portions with the adjacent spacers 71 and 72.

  Also, the spacer 71 is provided with crimping portions 71k1 (71j) and 71k2 (71j) at two positions corresponding to the crimping portions 2k1 and 2k2 provided on the inner core 2 with respect to the front surface 71a and the rear surface 71b. A convex portion as a caulking protrusion and a concave portion as a caulking hole are formed, respectively. Similarly, in the spacer 72, a convex portion as a caulking projection and a concave portion as a caulking hole are formed on the front surface 72a and the rear surface 72b at two positions corresponding to the caulking portions 2k1 and 2k2 of the inner core 2. Thus, caulking portions 72k1 (72j) and 72k2 (72j) are formed.

  Further, the leaf springs 41 and 42 also have caulking portions 41j to 41j and 42j to 42j, respectively, of which caulking portions 41k1, 41k2, 42k1, and 42k2 near the through holes 41a and 42a are spacers, respectively. 71 and 72 are provided at positions corresponding to the caulking portions 71k1, 71k2, 72k1, and 72k2, and engage with these. The caulking portions 42k1 and 42k2 of the leaf spring 42 each form a concave portion as a caulking hole with respect to the mounting portion rear surface 42d, and form a convex portion as a caulking projection with respect to the mounting portion front surface 42c. On the other hand, the caulking portions 41k1 and 41k2 of the leaf spring 41 each form a concave portion as a caulking hole with respect to the mounting portion rear surface 41d, and the mounting portion front surface 41c does not constitute a convex portion as a caulking projection and is out of plane. It is formed so as not to protrude.

  As described above, irregularities are formed on each surface perpendicular to the axial direction, and the irregularities are engaged when these are brought into contact with each other. Specifically, the front surface 2b of the inner core 2 and the rear surface 71b of the spacer 71 which are opposed to each other form an abutting portion by abutting in the axial direction, and crimping portions 2k1, 2k2 provided on the front surface 2b of the inner core 2 And the concave portions as the crimping portions 71k1 and 71k2 provided on the rear surface 71b of the spacer 71 are engaged with each other. The presence of two engaging portions among the contact portions formed in this manner ensures that the circumferential position is regulated.

  Similarly, a contact portion constituted by the front surface 71b of the opposing spacer 71 and the attachment portion rear surface 41d of the leaf spring 41, a contact portion constituted by the rear surface 2c of the inner core 2 and the front surface 72b of the spacer 72, and the spacer 72, the abutting portion constituted by the rear surface 72c of the leaf spring 42 and the attachment portion front surface 42c of the leaf spring 42 is configured to have two engaging portions each including a concave portion and a convex portion, Position restriction in the circumferential direction is performed at the point.

  Each member provided with the crimping portion having the circumferential position restriction as described above is inserted into the insertion portion 64 of the shaft 6 to obtain the state shown in FIG. The spacers 71 and 72 are formed so that the inner diameter is slightly larger than the outer diameter of the insertion portion 64 of the shaft 6, but the centering is automatically performed in the process of engaging in the axial direction as described above. .

  In such a state, the disc spring 73 as the spring member and the fixed collar 74 are fitted into the insertion portion 64 of the shaft 6. A through hole 74a provided in the center of the fixed collar 74 has an inner diameter slightly smaller than the outer diameter of the insertion portion 64 of the shaft 6, and the fixed collar 74 uses a hydraulic cylinder or the like to form the tip end portion 62 of the shaft 6. Further, by press-fitting in the right direction in the figure, the position is firmly fixed by the inner peripheral surface of the through hole 74a gripping the outer peripheral surface of the insertion portion 64 after the press-fitting.

  When the fixed collar 74 is press-fitted, it is only pressed in the axial direction, and the circumferential force is not applied as in the case of tightening the screw. Therefore, the position of each member is not shifted in the circumferential direction when assembling. . Therefore, it is possible to easily perform the assembly without using special attention, and to reduce assembly defects.

  Since the outer diameter of the fixed collar 74 is configured to be larger than the through holes 2a, 71a, 72a, 41a, and 42a of the inner core 2, the spacers 71 and 72, and the leaf springs 41 and 42, the fixed collar 74 is Acts as a position restricting member in the axial direction. That is, the position of the inner core 2, the spacers 71 and 72, and the leaf springs 41 and 42 is restricted in the axial direction between the end surface 74 b of the fixed collar 74 and the end surface 61 a of the large diameter portion 61. When the fixed collar 74 is press-fitted as described above, the disc spring 73 is deformed so as to be compressed in the axial direction, so that the restoring force of the disc spring 73 is always the inner core 2, the spacers 71 and 72, the leaf spring 41, It acts on 42 in the axial direction. For this reason, the axial displacement of the inner core 2, the spacers 71 and 72, the leaf springs 41 and 42, and the stationary collar 74 due to the displacement of the stationary collar 74 in the axial direction due to the thermal contraction of the shaft 6 and the thermal expansion of the shaft 6 Even when the relative position is changed, the shape of the disc spring 73 is restored so that no gap is generated, and the inner core 2, the spacers 71 and 72, and the leaf springs 41 and 42 are always changed in the axial direction without changing. You can work the urging power of. As a result, no gap is generated in the axial direction on the outer periphery of the shaft 6, and the support conditions for the leaf springs 41 and 42 can be prevented from changing. Therefore, even if it is used under severe conditions where the temperature change is severe, the change in characteristics as the linear actuator 1 is reduced.

  Further, the disc spring 73 is used as a spring member for applying an axial urging force to the inner core 2, the spacers 71, 72, and the plate springs 41, 42, so that the inner peripheral surface of the disc spring 73 is connected to the shaft 6. It is possible to easily support with high positional accuracy simply by fitting it to the outer periphery, and to apply a biasing force uniformly in the circumferential direction. For this reason, the leaf springs 41 and 42 can be uniformly supported over the entire circumference without any directionality, thereby contributing to the stabilization of the characteristics as the linear actuator 1.

  Further, caulking portions 2k1, 2k2, 71k1, 71k2, 72k1, 71k2, 41k1, 41k2, 42k1, and 42k2 that are provided in the respective abutting portions and perform circumferential position regulation as engaging portions composed of concave portions and convex portions. (Refer to FIG. 11) generates a strong fastening force by generating a slight deformation when the fixing collar 74 is press-fitted into the shaft 6 as a combination of a caulking projection and a caulking hole. Thereby, the inner core 2, the spacers 71 and 72, and the leaf springs 41 and 42 are integrated without causing any circumferential displacement.

  In the above assembly procedure, the inner core 2, the spacers 71, 72 and the leaf springs 41, 42 are fitted to the insertion portion 64 of the shaft 6, and then the inner core 2, Although the case where the spacers 71 and 72 and the leaf springs 41 and 42 are fastened to each other has been shown, adjacent members are integrated using a caulking portion in a stage before fitting into the insertion portion 64 of the shaft 6. It is also possible. For example, either or both of the spacers 71 and 72 can be connected to the inner core 2 by using a caulking portion to integrate them, and the number of parts can be reduced to facilitate parts management and assembly. It is preferable.

  After the inner core 2, the spacers 71 and 72, the leaf springs 41 and 42, the disc spring 73, and the fixed collar 74 are assembled with the shaft 6 as a reference as described above, the upper core 31 and the lower core 31 are arranged in the form shown in FIG. 3. The side cores 32 are respectively attached from above and below in the drawing, and constitute the outer core 3. The outer core 3 constituted by the upper core 31 and the lower core 32 is provided so as to surround the inner core 2 on the outer side in the radial direction of the inner core 2, and is sandwiched in the axial direction by the frame portions 41 e and 42 e of the leaf springs 41 and 42. Provided. The outer core 3 has magnetic pole portions 31a and 32a formed on the inner surface thereof, and is configured to face the permanent magnets 23 and 24 with an appropriate gap therebetween. The upper core 31 and the lower core 32 are provided with guide pins 93 and 93 so as to be inserted into pin holes 31b and 32b provided outside the magnetic pole portions 31a and 32a, respectively. Is inserted into the notches 41b and 42b formed in the plate springs 41 and 42 described above, and can be incorporated while positioning.

  Since it has a positioning function using such guide pins 93, positioning can be performed so that the outer core 3 and the inner core have the same axis X at the time of assembly. 24 and the magnetic pole portions 31a and 32a are not caused to collide with each other to cause damage, and an appropriate gap can be formed between them. The upper core 31 and the lower core 32 are provided with through holes 31c, 31c, 32c, and 32c at positions corresponding to the bolt holes 41g to 41g and 42g to 42g provided in the leaf springs 41 and 42, respectively. Bolts 91 to 91 can be inserted at the final stage of assembly.

  The upper core 31 and the lower core 32 having the shapes as described above are configured in detail as follows. Hereinafter, the upper core 31 will be described as a representative.

  The upper core 31 has a configuration as shown in FIG. 6, and is formed by integrating five core elements 31B1 to B5 arranged in the axial direction. Each of the core elements 31B1 to B5 is formed in a U shape and is formed by laminating thin steel plates each formed by punching. The method for connecting these thin plates is the same as the fastening method using the crimping portions 42j1 to 42j5 formed in the respective portions of the thin plates 42P1 to P5 described with reference to FIG.

  Returning to FIG. 6, the core elements 31 </ b> B <b> 1 to B <b> 5 have caulking portions 31 j <b> 1 to j <b> 5 at their respective portions, and the caulking portions 31 j <b> 1 to j <b> 5 Therefore, when the core elements 31B1 to B5 are overlapped, the crimping portions 31j1 to j5 are engaged to restrict the position. The core elements 31B1 to B5 are respectively formed with bolt hole portions 31c1 to 31c5 and pin hole portions 31b1 to b5, and when the core elements 31B1 to B5 are connected to form the upper core 31 as a unit, The bolt hole 31c and the pin hole 31b are respectively configured. Inside the pin hole 31 b, guide pins 93 are inserted in the axial direction, and both end portions of the guide pins 93 protrude from the upper core 31. Further, step portions 31d1 to d5 and 31e1 to e5 are formed at both ends of the U-shape of the core elements 31B1 to B5, respectively, and the lower core 32 after the portions are integrated as the upper core 31. It is configured to mesh with the same part (see FIG. 3).

  In the present embodiment, the lower core 32 shown in FIG. 3 has the same shape as the upper core 31 configured as described above, and is used with the upper core 31 upside down. is there.

  Returning to FIG. 3, after the upper core 31 and the lower core 32 are positioned between the leaf springs 41 and 42 while being positioned by the guide pins 93 and 93, the stoppers are further sandwiched from outside in the axial direction. The members 51 and 52 are assembled. The stopper members 51 and 52 are each configured to have a rectangular outer shape and are substantially the same as the outer shapes of the leaf springs 41 and 42 and the outer core 3. Each stopper member 51, 52 is provided with groove portions 51b, 51b, 52b, 52b on the upper and lower sides in the drawing, respectively, and these portions are fitted to both ends of guide pins 93, 93 protruding in the axial direction from the outer core 3. Thus, positioning is performed, and the axial center X of the shaft 6 and the central axis are made the same as in the outer core 3.

  The stopper members 51 and 52 are each formed in a shape of “8”, and holes 51 a and 52 a are provided at the center thereof. The inner diameters of these holes 51 a and 52 a are the above-described fixed collar 74. And the outer diameter of the large diameter portion 61 of the shaft 6 are set to be slightly larger. Therefore, the fixed collar 74 and the large diameter portion 61 do not interfere with the holes 51a and 52a. The stopper members 51 and 52 are respectively provided with bolt holes 51c to 51c and 52c to 52c at four corners.

  The stopper members 51 and 52 configured in such a shape have the following configuration in detail. Hereinafter, the stopper member 51 on the left side in the drawing will be representatively described.

  The stopper member 51 has a configuration as shown in FIG. 7, and is configured by connecting two stopper elements 51B1 and 51B2 in the axial direction. The stopper elements 51B1 and 51B2 are formed in a rectangular shape having substantially the same outer shape, but the stopper element 51B1 is formed in a “8” shape and the stopper element 51B2 is formed in a “O” shape. . These stopper elements 51B1 and 51B2 are each configured by laminating thin punched steel plates. These thin plates are connected by engaging the caulking portions 51j1 to 51j1 and 51j2 to 51j2 provided in each of them in the axial direction. The leaf springs 41 and 42, the inner core 2 and the core spring 2 shown in FIG. The outer core 3 is configured by the same method.

  The stopper member 51 is designed so that the caulking portions 51j1 to 51j1 in FIG. 7 do not protrude leftward in the drawing in order to prevent a convex portion from being generated in the axial direction when the stopper member 51 is assembled as the linear actuator 1. . This method will be described in detail later.

  The stopper member 52 (see FIG. 3) is also manufactured in the same manner as the stopper member 51 as described above, but differs from the stopper member 51 when assembled as the linear actuator 1 as shown in FIG. The crimping member (see FIG. 7) is formed in the direction in which the concave portion is formed with respect to the outside in the axial direction.

  The inner peripheral surfaces of the holes 51a and 52a provided at the centers of the stopper members 51 and 52 form gaps between the fixed collar 74 and the outer peripheral surfaces of the large-diameter portion 61 of the shaft 6, respectively. Further, a resin collar 75 is fitted on the outer periphery of the fixed collar 74 and a resin collar 76 is fitted on the outer periphery of the large-diameter portion 61a at positions facing the hole portions 51a and 52a. FIG. 2 shows gaps between the fixed collar 74 fitted with the resin collars 75 and 76 and the large-diameter portion 61 of the shaft 6 and the hole portions 51a and 52a of the stopper members 51 and 52 facing them. Are defined as δ2 and δ3, respectively. On the other hand, a gap between the permanent magnets 23 and 24 and the magnetic pole portions 31a and 32a is defined as δ1. In the present embodiment, δ2 and δ3 are set to have the same size, and are set to be smaller than δ1. Therefore, even when the inner core 2 and the outer core 3 are relatively displaced in the radial direction, before the permanent magnets 23 and 24 come into contact with the magnetic pole portions 31a and 32a, the resin collars 75 and 76 are connected to the stopper member 51, Since the contact with the inner peripheral surfaces of the hole portions 51a and 52a of the 52 functions as a stopper, the contact between the permanent magnets 23 and 24 and the magnetic pole portions 31a and 32a can be prevented.

  The resin collars 75 and 76 are attached to the fixed collar 74 and the large-diameter portion 61 of the shaft 6 as shown in FIGS. 9 (a) and 9 (b). FIG. 9B is a schematic diagram showing a simplified case assuming that parts such as the inner core 5 and the leaf springs 41 and 42 are removed from the shaft 6. Small diameter portions are formed as stepped portions 74c and 61b in the fixed collar 74 and the large diameter portion 61 of the shaft 6, respectively, and resin collars 75 and 76 are fitted into these portions.

  The resin collars 75 and 76 have the same shape, are each formed in a thin cylindrical shape, and are provided with cutting portions 75a and 76a at one place in the circumferential direction. For this reason, it is fitted into the stepped portions 74c and 74b so as to have a larger diameter than that portion, and the inner peripheral surface is brought into close contact with each other by the restoring force so that the position is fixed. The cutting portions 75a and 75b are provided obliquely with respect to the axial direction, and are configured to form the resin collars 75 and 76 at any location in the circumferential direction while being attached to the stepped portions 74c and 74b. The dimensions are set so that the part exists. Therefore, even if the inner core 2 and the outer core 3 are relatively displaced with respect to any radial direction, the function as a stopper remains unchanged.

  In the state where the stopper members 51 and 52 are formed and assembled as described above, the bolt holes 51c to 51c and 52c to 52c provided in the stopper members 51 and 52 are bolt holes 41g provided in the leaf springs 41 and 42, respectively. ˜41 g, 42 g to 42 g and the bolt holes 31 c, 31 c, 32 c, 32 c provided in the outer core 3 are continuous in the axial direction. Therefore, the bolts 91 to 91 are inserted in the state in which the stopper members 51 and 52 have been assembled, and the nuts 92 to 92 are tightened at the tips thereof, so that the stopper members 51 and 52, the leaf springs 41 and 42, and the outer core 3 are pivoted. Can be fastened in the direction.

  At this time, the convex portions and the concave portions constituting the stopper members 51 and 52, the leaf springs 41 and 42, and the caulking portions 51j, 52j, 41j, 42j, 31j, and 32j formed on the outer core 3 are respectively engaged in the axial direction. As a result, it functions as an engaging portion for positioning in the circumferential direction, and a small deformation is caused by applying a pressing force in a state where the convex portion is engaged as a caulking projection and the concave portion is engaged as a caulking hole. This will generate a stronger fastening force.

  After fastening in the axial direction in this way, the outer core 3 can operate integrally with the frame bodies 41e and 42e of the leaf springs 41 and 42 and the stopper members 51 and 52. The linear actuator 1 shown in FIG.

  Here, the method for mutually connecting the laminated steel plates used for constituting the inner core 2, the outer core 3, the spring members 41 and 42, and the stopper members 51 and 52 described above will be described in detail. FIG. 10A shows an example schematically showing the structure of the caulking portion.

  In this example, the case where the five thin steel plates 81a-e are connected is shown. On the thin plates 81c to e, convex portions as described above are formed by press marks as caulking portions 82c to 82e in respective parts. The convex portion is formed in a reverse V-shape with a notch parallel to two sides of the side, that is, the depth of the paper surface and the near side, while the notch is directed to one side (left direction in the figure). It is deformed and functions as a caulking projection. In order to form a concave portion as a caulking hole with respect to the back surface direction (right direction in the figure), the convex portion is engaged with the caulking portions 82c to 82e so that the concave and convex portions overlap when the thin plates 81c to e are overlapped. Match. In this example, rectangular openings are formed in the thin plates 82a and 82b as punching holes as the crimping portions 82a and 82b. The portion can be engaged so that a convex portion as a caulking portion 82c formed on the thin plate 81c is inserted. When the crimping portions 82a to 82e are engaged in this way, pressing is performed in the stacking direction by a press or the like, so that the crimping portions 82a to 82e are slightly deformed to generate a fastening force.

  In the configuration example of the caulking portions 82a to 82e, since the caulking portions 82a and 82b of the thin plates 81a and 81b on the left side in the drawing are rectangular openings, even when the thin plates 81a to 82e are stacked and connected, It is possible to prevent a convex portion from being formed on the left side of the drawing from the surface of the thin plate 81a. However, it is not essential to configure some of the crimped portions 82a and 82b as openings in this manner, and all the crimped portions may be formed in the same shape as the inverted V shape. Is possible. Among the above, the stopper member 51 shown in FIG. 3 is configured by a method of providing openings in some of the caulking portions 82a and 82b. All the caulking portions have the same inverted V shape and project outward. The stopper member 52, the inner core 2, the outer core 3, and the leaf spring 42 are formed so as to generate a portion that becomes. As described above, the plate spring 41 is configured such that only the caulking portion that contacts the disc spring 73 does not form a convex portion, and the other portions are configured such that a convex portion is generated.

  In this way, each member can be easily formed by laminating steel plates on which crimped portions as press marks or punched holes are formed, and each member is positioned using the crimped portions as engaging portions. While being used, it is configured to be able to exert a fastening force between the members by further pressing in the stacking direction.

  Moreover, it is also possible to comprise a crimping part like the example of FIG.10 (b). In this example, the caulking portions 182a to 182e are formed in a circular shape when viewed from the axial direction, and do not have a cut on the side unlike the inverted V type in FIG. 10 (b), the caulking portions 182a to 182e formed on the thin plates 181b to 181e constitute a circular convex portion in the left direction in the drawing, and the right side in the drawing which is the back surface. Form a circular recess. Further, the caulking portion 182a in the thin plate 181a is configured as the same circular hole. These caulking portions 182a to 182e are engaged when the thin plates 181a to 181e are stacked, and a fastening force can be generated between them by applying a pressing force in the axial direction.

  As described above, the linear actuator 1 configured as shown in FIGS. 1 and 2 operates as follows. Hereinafter, description will be made with reference to FIG.

  Since the linear actuator 1 in this embodiment is used by fixing the shaft 6, the linear actuator 1 is fitted into the outer periphery (insertion portion) 64 of the shaft 6 and is positioned in the axial direction by the fixed collar 74 and the disc spring 73. The inner core 2 is functioning as a so-called stator. Similarly, the outer core 3 provided on the radially outer side of the inner core 2 and having the same axis by the leaf springs 41 and 42 supported by the shaft 6 functions as a mover. The outer core 3 is elastically supported by the plate springs 41 and 42 so that the outer core 3 can be displaced in the plate thickness direction, that is, the axial direction of the shaft 6.

  Permanent magnets 23 and 24 are provided on the upper and lower sides of the inner core 2 in the drawing, and magnetic pole portions 31a and 32a are provided on the inner surface of the outer core 3 so as to face the permanent magnets 23 and 24, respectively. Provided, and a gap is formed between the two. As described above, the permanent magnets 23 and 24 are provided with different magnetic poles in the axial direction, and a magnetic field is generated around these magnetic poles. The positional relationship between the permanent magnets 23 and 24 and the magnetic pole portions 31 a and 32 a is an important factor that determines the characteristics of the linear actuator 1, and a positional deviation occurs in the circumferential direction between the leaf springs 41 and 42 and the inner core 2. This leads to a decrease in efficiency.

  In the present embodiment, at least two engaging portions composed of a concave portion and a convex portion are provided in the contact portion formed by contacting the opposing surfaces of the respective members in the axial direction, so that the circumferential direction can be obtained. Misalignment can be suppressed. Furthermore, since it is possible to prevent misalignment by adopting a configuration in which assembly can be performed without applying a force in the circumferential direction only by press-fitting the fixed collar 74 in the axial direction, the permanent magnet can be prevented. 23 and 24 and the magnetic pole portions 31a and 32 are maintained in an appropriate positional relationship so that the characteristics as a device are not impaired. In addition, since the concave and convex portions are formed as caulking holes and caulking projections, it is possible to exert a fastening force between the members by pressing in the axial direction during assembly, Since the urging force is always applied in the axial direction by the disc spring 73, the engaging portion composed of the concave portion and the convex portion can be more strongly maintained in the engaged state.

  By applying a current to the coils 25 and 26 provided so as to be wound around the inner core 2, a magnetic field can be biased in the axial direction. In a state where no current is applied, the magnetic pole portions 31a and 32a are disposed so as to face the axial center portions of the permanent magnets 23 and 24, respectively. An axial thrust can be applied to the portions 31a and 32a. In this way, the outer core 3 can be displaced in the axial direction, and the outer core 3 can be vibrated with an arbitrary acceleration and frequency by changing the current in a sine wave shape in the forward and reverse directions. It is also possible to use it as an active vibration damper by utilizing such a function.

  As described above, the linear actuator 1 according to the present invention includes the inner core 2, the pair of leaf springs 41 and 42 provided so as to sandwich the inner core 2 from the front and rear in the axial direction, and the pair of leaf springs 41 and 42. An outer core 3 provided on the radially outer side of the inner core 2 so as to have the same axial center as the inner core 2 while being supported, and the inner core 2 is provided with permanent magnets 23 and 24, The outer core 3 is formed with magnetic pole portions 31a, 32a facing the permanent magnets 23, 24 at a predetermined interval, and spacers 71, 72 are provided between the inner core 2 and the plate springs 41, 42, respectively. The spacers 71 and 72 and the inner core 2, and the spacers 71 and 72 and the leaf spring 4 adjacent to the spacers 71 and 72. , 42 are brought into contact with each other in the axial direction to form respective contact portions, and the engagement is formed of a concave portion formed on one of the opposing surfaces constituting the contact portion and a convex portion formed on the other. A plurality of joint portions are provided at each of the contact portions.

  With this configuration, the relative position is determined simply by combining the inner core 2, the spacers 71 and 72, and the leaf springs 41 and 42 in the axial direction while engaging the concave and convex portions provided on the opposing surfaces. It is possible to prevent misalignment in the circumferential direction. Therefore, the relative positions of the outer core 3 and the inner core 2 supported by the leaf springs 41 and 42 are shifted in the circumferential direction without using a specially processed shaft for forming a key groove, a flat surface portion, or the like. The magnetic pole portions 31a, 32a and the permanent magnets 23, 24 can be appropriately opposed to each other, and contact between components inside can be prevented. As a result, it is possible to provide the linear actuator 1 at a low cost that does not cause a reduction in efficiency or failure.

  Further, by integrally configuring at least one of the spacers and the inner core, the number of parts can be reduced, so that parts management and assembly can be facilitated.

  Further, the convex portion and the concave portion constituting the engaging portion are constituted by caulking protrusions and caulking holes, and the positions are fixed to each other by pressing in the axial direction in a state where these are engaged. Therefore, once the inner core 2, the leaf springs 41 and 42 and the spacers 71 and 72 are aligned, the members can be fastened without causing positional displacement in the circumferential direction during the assembly process. Therefore, assembly can be performed easily.

Further, the inner core 2, the plate springs 41 and 42, and the spacers 71 and 72 are formed by laminating steel plates, respectively, and a press mark or a press mark corresponding to the caulking projection and the caulking hole is formed on a part of each steel plate. Since the punch hole is formed, each member can be configured by a simple processing method, and the manufacturing cost can be further reduced.
Second Embodiment

  FIG. 12 shows a cross-sectional view of the linear actuator 101 according to the second embodiment of the present invention, and the same reference numerals are given to the portions common to the first embodiment.

  In this embodiment, the number of crimping portions formed on the inner core 102, the spacers 171, 172, the leaf springs 141, 142, the outer core 103 and the stopper members 151, 152 is reduced as compared with the case of the first embodiment. It is. Therefore, there is an advantage that the yield during processing is improved.

  The specific positional relationship of the caulking portions is as shown in FIG. 13, and those that act as engaging portions between the inner core 102, the spacers 171, 172, and the leaf springs 141, 142 are the respective through holes 102a, 171a, 172a. 141a, 142a, one caulking portion 102k1, 171k1, 141k1, 142k1 provided in the vicinity.

  In the present embodiment, the inner diameters D6 to D10 of the through holes 102a, 141a, 142a, 171a, and 172a of the inner core 102, the leaf springs 141 and 142, and the spacers 171 and 172 are all the same as the outer diameter D0 of the insertion portion 64 of the shaft 6. The shaft 6 is formed so that the shaft 6 can be inserted smoothly and tightly. Therefore, the inner core 102, the leaf springs 141 and 142, and the spacers 171 and 172 are each regulated in position in the radial direction by the shaft 6 and have the same axis.

  Therefore, although the inner core 102, the leaf springs 141 and 142, and the spacers 171 and 172 have only one engaging portion at each of the contact portions formed by the respective facing surfaces, the position regulation by the shaft 6 is limited. As a result, the position is regulated at two locations, respectively, so that the position can be reliably regulated in the circumferential direction as in the case of the first embodiment.

  Needless to say, a plurality of engaging portions may be provided in each abutting portion, and the positions may be regulated in cooperation with each other.

  As described above, the linear actuator 101 of the present invention includes the inner core 102, the pair of leaf springs 141 and 142 provided so as to sandwich the inner core 102 from the front and rear in the axial direction, and the pair of leaf springs 141 and 142. An outer core 103 provided on the radially outer side of the inner core 102 so as to have the same axial center as the inner core 102 while being supported, and the inner core 102 is provided with permanent magnets 23 and 24, The outer core 103 is formed with magnetic pole portions 131a and 132a facing the permanent magnets 23 and 24 at a predetermined interval, and the inner core 102 and the pair of leaf springs 141 and 142 are positioned at the same axial center. The through holes 102a, 141a, and 142a are formed, and the through holes 102 are formed. , 141a, 142a, and a shaft 6 closely inserted into the outer periphery of the shaft 6 and spacers 171, 172 disposed between the inner core 102 and the leaf springs 141, 142, respectively. The spacers 171 and 172 and the inner core 102, and the spacers 171 and 172 and the opposing surfaces of the leaf springs 141 and 142 adjacent to the spacers 171 and 172 are in contact with each other in the axial direction. And at least one engaging portion including a concave portion formed on one of the opposing surfaces constituting the contact portion and a convex portion formed on the other side. And

Since it is configured in this manner, the inner core 102, the spacers 171, 172, and the leaf springs 141, 142 are simply fitted into the outer periphery of the shaft 6 while engaging the concave and convex portions provided on the opposing surfaces. The position can be determined relatively with the above, and the circumferential displacement is not caused. Therefore, even if the shaft 6 is not specially processed, the relative positions of the outer core 103 and the inner core 102 supported by the plate springs 141 and 142 are not shifted in the circumferential direction, and the magnetic pole portions 131a and 132a and the permanent magnet 23 are not displaced. , 24 can be appropriately opposed to each other, and contact between components inside can be prevented. As a result, it is possible to provide the linear actuator 101 that does not cause a reduction in efficiency or failure at a low cost.
<Third Embodiment>

  FIG. 14 is an exploded perspective view of the linear actuator 201 according to the third embodiment of the present invention, and the same reference numerals are given to the portions common to the first embodiment and the second embodiment.

  In this embodiment, based on the configuration of the first embodiment, the permanent magnets 223 and 224 are configured in a flat plate shape, the inner core 202 to which the permanent magnets 223 and 224 are attached, and the core covers 221 and 222 are connected to the permanent magnet 223. The shape is changed to that corresponding to H.224. Further, the magnetic pole portions 231 a and 232 a facing the permanent magnets 223 and 224 are also formed with a flat surface corresponding to the permanent magnets 223 and 224.

  Since the permanent magnets 223 and 224 are configured in a flat plate shape as described above, the permanent magnets 223 and 224 can be easily processed, and the portions to be removed during the processing can be reduced. Manufacturing cost can be reduced. In general, permanent magnets are expensive because of the use of special materials, and are difficult to process. Therefore, the cost of the permanent magnets is high, and the cost required for these permanent magnets accounts for a large percentage of the manufacturing cost of the entire linear actuator. Therefore, the cost reduction effect by flattening the permanent magnet as described above is very large.

  However, in general, the flattening of the permanent magnets 223 and 224 is caused by a large gap between the permanent magnets 223 and 224 and the magnetic pole portions 231a and 232a due to a slight displacement in the circumferential direction between the inner core 202 and the outer core 203. Characteristics are easy to change and difficult to assemble.

  In this regard, in the present embodiment, the inner core 202, the spacers 71 and 72, and the leaf springs 41 and 42 are engaged with the concave and convex portions as the crimped portions provided in each, as in the first embodiment. Since the configuration is such that no positional displacement occurs in the circumferential direction, no circumferential positional displacement occurs between the outer core 203 and the inner core 202 that are supported by the leaf springs 41 and 42 and are regulated in the circumferential direction. It is like that. Therefore, the permanent magnets 223 and 224 can be flattened, and the cost reduction effect described above can be obtained.

  The specific configuration of each part is not limited to the above-described first to third embodiments.

  For example, in the above embodiment, the inner core 2 (102, 202) is configured as a stator and the outer core 3 (103, 203) is configured as a mover. However, this may be reversed.

  Further, in the above embodiment, the inner core 2 (102, 202) is provided with the permanent magnets 23 (223), 24 (224) and the coils 25, 26, and the outer core 3 (103, 203) is provided with the magnetic pole portion 31a (131a, 231a). ), 32a (132a, 232a), but this can be reversed.

  In the above embodiment, the disc spring 73 as a spring member is attached between the fixed collar 74 (174) and the leaf spring 41 (141). However, it is possible to apply an urging force in the axial direction. As long as it exists, it can be provided at any position between the large-diameter portion 61 of the shaft 6 and the fixed collar 74. For example, it is also suitable to provide between the large diameter portion 61 of the shaft 6 and the leaf spring 42 (142). Furthermore, it is good also as a structure which attaches the disc spring 73 to both between the fixed collar 74 and the leaf | plate spring 41 (141) and between the large diameter part 61 and the leaf | plate spring 42 (142).

  Other configurations can be variously modified without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Linear actuator 2 ... Inner core 3 ... Outer core 6 ... Shaft 21, 22 ... Core cover 23, 24 ... Permanent magnet 25, 26 ... Coil 31, 32 ... Split core 33, 34 ... Magnetic pole part 41, 42 ... Plate spring 51, 52 ... Stopper member 71, 72 ... Spacer 73 ... Belleville spring (spring member)
74 ... Fixed collar 75, 76 ... Resin collar 91 ... Bolt 92 ... Nut 93 ... Guide pin

Claims (4)

With inner core,
A pair of leaf springs provided so as to sandwich the inner core from the front and rear in the axial direction;
An outer core provided on the radially outer side of the inner core so as to have the same axis as the inner core while being supported by the pair of leaf springs,
A linear actuator in which a permanent magnet is provided on one of the inner core and the outer core, and a magnetic pole portion facing the permanent magnet at a predetermined interval is formed on the other of the inner core and the outer core,
Spacers are provided between the inner core and the leaf springs,
Each spacer and the inner core, and each spacer and each opposing surface of the leaf spring adjacent to the spacer are contacted in the axial direction to form a contact portion, and the opposing surface constituting the contact portion A plurality of engaging portions each including a concave portion formed on one side and a convex portion formed on the other side ,
The convex part and the concave part constituting the engaging part are constituted by caulking protrusions and caulking holes, and the positions are fixed to each other by pressing in the axial direction in a state in which these are engaged,
The linear actuator , wherein the inner core, the leaf spring, and the spacer are each formed by laminating steel plates, and the crimping protrusions and the crimping holes are formed in a part of each steel plate . With inner core,
A pair of leaf springs provided so as to sandwich the inner core from the front and rear in the axial direction;
An outer core provided on the radially outer side of the inner core so as to have the same axis as the inner core while being supported by the pair of leaf springs,
A linear actuator in which a permanent magnet is provided on one of the inner core and the outer core, and a magnetic pole portion facing the permanent magnet at a predetermined interval is formed on the other of the inner core and the outer core,
The inner core and the pair of leaf springs are each formed with a through hole at the same axial center, and a shaft that is tightly inserted into each through hole;
A spacer that is tightly fitted to the outer periphery of the shaft and disposed between the inner core and each leaf spring;
Each spacer and the inner core, and each spacer and each opposing surface of the leaf spring adjacent to the spacer are contacted in the axial direction to form a contact portion, and the opposing surface constituting the contact portion An engagement portion formed of a concave portion formed on one side and a convex portion formed on the other side is provided in at least one place on the contact portion ,
The convex part and the concave part constituting the engaging part are constituted by caulking protrusions and caulking holes, and the positions are fixed to each other by pressing in the axial direction in a state in which these are engaged,
The linear actuator , wherein the inner core, the leaf spring, and the spacer are each formed by laminating steel plates, and the crimping protrusions and the crimping holes are formed in a part of each steel plate . The linear actuator according to claim 1, wherein at least one of the spacers and the inner core are integrally formed. Wherein with permanent magnets is formed in a plate shape, a linear actuator according to any one of claims 1 to 3, the opposing surface of the magnetic pole portion, characterized in that it is formed flat facing the permanent magnet.

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