JP7366585B2 - linear motor - Google Patents

Description

The present invention relates to a linear motor.

A linear motor used as a device that notifies information by vibration is disclosed in Patent Document 1. The vibrating linear actuator of Patent Document 1 includes an outer yoke having a magnet portion, an inner yoke having a coil portion that generates a vibrating magnetic field with respect to the outer yoke, a base supporting the outer yoke and the inner yoke, and the base. and a lid part that covers the outer yoke and the inner yoke. A support member is spanned between the outer yoke and the inner yoke. The supporting member is a leaf spring, and the outer yoke is supported by the leaf spring so as to be able to freely vibrate.

Japanese Patent Application Publication No. 2003-154315

In a linear motor, a magnet and a coil face each other with a narrow gap between them. Therefore, when assembling a leaf spring between a movable body (outer yoke) equipped with a magnet and a fixed body (inner yoke) equipped with a coil, the magnet of the movable body and the fixed body tend to interfere with each other. The problem is that the work is not easy.

In view of the above problems, it is an object of the present invention to provide a linear motor that is easy to assemble by installing a leaf spring between a movable body and a fixed body.

In order to solve the above problems, the present invention provides a fixed body including a coil, a movable body including a magnet located on the inner peripheral side of the coil, and a movable body capable of displacing the movable body in a direction along the axis of the coil. and a support mechanism that moves the movable body in the axial direction by supplying power to the coil, wherein the direction along the axis of the coil is the axial direction;
When one of the axial directions is defined as a first direction and the other as a second direction, the support mechanism has a second structure that is spanned between the fixed body and the movable body with the thickness direction facing the axial direction. The movable body includes a movable body body including the magnet, and a first magnetic member fixed to the first plate spring in the first direction of the movable body body. The body main body is the first
The first magnetic member includes a first cylindrical portion into which the first axial portion is movably inserted in the axial direction, and a first cylindrical portion in which the first axial portion is inserted into the movable body body by the magnetic force of the magnet. the first leaf spring is provided with a first movable body side fixing part in a central portion in a radial direction perpendicular to the axis, and the first movable body side fixing part is attached to the first movable body side fixing part. It is characterized by being fixed to one cylindrical part .

According to the present invention, the movable body includes a first magnetic member and a movable body body having a magnet. Further, the first magnetic member is fixed to the first leaf spring, and the movable body main body is attracted to the first magnetic member by the magnetic force of the magnet. Therefore, in the assembly work in which the first leaf spring is bridged between the movable body and the fixed body, the first magnetic member and the movable body main body are separated, and the first leaf spring and the first magnetic member can be connected. . Further, after the first leaf spring and the first magnetic member are connected, the movable body can be configured by adhering the movable body body including the magnet to the first magnetic member. Therefore, interference between the magnet and the fixed body can be avoided during the assembly work in which the first leaf spring is bridged between the movable body and the fixed body. Moreover, if the first shaft part of the movable body main body is inserted into the first cylindrical part of the first magnetic member and the movable body main body is attracted to the first magnetic member, the movable body body including the magnet can be attached to the inner circumference of the coil. placed in a predetermined position on the side. Therefore, the assembly work of spanning the first leaf spring between the movable body and the fixed body becomes easy.

FIG. 1 is an external perspective view of a linear motor to which the present invention is applied. FIG. 2 is a sectional view taken along line AA of the linear motor shown in FIG. FIG. 3 is an exploded perspective view of the linear motor. FIG. 4 is a perspective view of the first leaf spring, the second leaf spring, and the movable body. FIG. 5 is an exploded perspective view of the first leaf spring, the second leaf spring, and the movable body. FIG. 6 is an explanatory diagram of the assembly work of the linear motor.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a linear motor according to the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a linear motor. FIG. 2 is a sectional view taken along line AA of the linear motor shown in FIG. FIG. 3 is an exploded perspective view of the linear motor. FIG. 4 is a perspective view of the first leaf spring, the second leaf spring, and the movable body. FIG. 5 is an exploded perspective view of the first leaf spring, the second leaf spring, and the movable body.

(overall structure)
As shown in FIG. 1, the linear motor 1 includes a cylindrical case 2. As shown in FIG. The case 2 includes a cylindrical body 3, a first sealing part 4 that seals the end of the body 3 on one side in the axial direction X along the axis L of the case 2, and a body on the other side in the axis L direction. A second sealing part 5 sealing the end of the part 3 is provided. An opening 6 is provided in the central portion of the body 3 in the axial direction X. A terminal block 7 projects from the opening 6 to the outside of the case 2 . Two first terminal pins 50 and two second terminal pins 56 are supported on the terminal block 7 .

In the following description, one side of the axial direction X is referred to as a first direction X1, and the other side is referred to as a second direction X2. The first direction X1 is the side where the first sealing part 4 is located, and the second direction X2 is the side where the second sealing part 5 is located.

As shown in FIG. 2, the case 2 houses the coil 11, the movable body 12, and the support mechanism 13. The coil 11 is arranged with its opening facing the axial direction X. The coil 11 is fixed to the body 3 of the case 2. The axis of the coil 11 is the same as the axis L of the case 2.

The coil 11 and the case 2 constitute a fixed body 15. The movable body 12 is located on the inner peripheral side of the coil 11. The movable body 12 includes a magnet 16. The support mechanism 13 includes a first leaf spring 17 and a second leaf spring 18 that are bridged between the fixed body 15 and the movable body 12. The first leaf spring 17 and the second leaf spring 18 each have their thickness directed in the axial direction X. The second leaf spring 18 is arranged apart from the first leaf spring 17 in the second direction X2.

The linear motor 1 moves the movable body 12 in the axial direction X by supplying power to the coil 11 . Furthermore, the linear motor 1 causes the movable body 12 to vibrate in the axial direction X by periodically reversing the direction of the current flowing through the coil 11.

(fixed body)
As shown in FIG. 1, the case 2 includes a first case 21 and a second case 22, which are divided in the middle of the body 3 in the axial direction X. The first case 21 is located in the first direction X1 of the second case 22. The first case 21 includes a first sealing part 4 and a first body part 23. The second case 22 includes a second sealing part 5 and a second body part 24. The first body part 23 and the second body part 24 constitute the body part 3 when the first case 21 and the second case 22 are stacked in the axial direction X. A first notch 25 is provided at the end of the first case 21 on the second case 22 side. A second notch 26 is provided at the end of the second case 22 on the first case 21 side. The first notch 25 and the second notch 26 constitute the opening 6 when the first case 21 and the second case 22 are overlapped in the axial direction X.

As shown in FIG. 2, the first sealing part 4 of the first case 21 has a first large diameter part 31 having the same outer diameter as the body part 3 and a first direction X1 of the first large diameter part 31. A first small diameter portion 32 having a smaller outer diameter than the first large diameter portion 31 is provided. The first sealing surface 33 facing in the second direction X2 in the first sealing part 4 of the first case 21 is provided with a circular recess depressed in the first direction X1 in the center portion. Therefore, the first sealing surface 33 includes a first annular surface portion 34, a first circular surface portion 35 that is located inside the first annular surface portion 34 and retreated from the first annular surface portion 34 in the first direction A first annular wall surface 36 extending in the direction X and connecting the first annular surface portion 34 and the first circular surface portion 35 is provided. The first annular surface portion 34 is provided on the first large diameter portion 31 , and the first circular surface portion 35 is provided on the first small diameter portion 32 .

The second sealing part 5 of the second case 22 has a second large diameter part 37 having the same outer diameter as the body part 3, and a second large diameter part 37 that extends from the second large diameter part 37 in the second direction X2 of the second large diameter part 37. The second small diameter portion 38 also has a small outer diameter. The second sealing surface 39 facing in the first direction X1 in the second sealing part 5 of the second case 22 is provided with a circular recessed portion recessed in the second direction X2 in the central portion. Therefore, the second sealing surface 39 includes a second annular surface portion 40, a second circular surface portion 41 that is located inside the second annular surface portion 40 and is recessed in the second direction X2, and an axis line. A second annular wall surface 42 extending in the direction X and connecting the second annular surface portion 40 and the second circular surface portion 41 is provided. The second annular surface portion 40 is provided on the second large diameter portion 37 , and the second circular surface portion 41 is provided on the second small diameter portion 38 .

The fixed body 15 includes, as the coil 11, a first coil 45 and a second coil 46 coaxially disposed in the second direction X2 of the first coil 45. As shown in FIG. 3, the first coil 45 is wound around a first coil bobbin 47. The first coil bobbin 47 includes a first annular portion 48 around which the first coil 45 is wound, and a first terminal block portion 49 that protrudes outward from a portion of the first annular portion 48 in the circumferential direction. The first terminal block section 49 includes two first terminal pins 50. One end and the other end of the winding of the first coil 45 are connected to each of the two first terminal pins 50 . As shown in FIG. 1, the first coil bobbin 47 is fixed to the first body part 23 with the first terminal block part 49 protruding from the first notch part 25 to the outside.

As shown in FIG. 2, the second coil 46 is wound around a second coil bobbin 53. As shown in FIG. 3, the second coil bobbin 53 includes a second annular portion 54 around which the second coil 46 is wound, and a second terminal block portion that protrudes outward from a portion of the second annular portion 54 in the circumferential direction. 55. The second terminal block portion 55 includes two second terminal pins 56 . One end and the other end of the winding of the second coil 46 are connected to each of the two second terminal pins 56 . As shown in FIG. 1, the second coil bobbin 53 is fixed to the second body portion 24 with the second terminal block portion 55 protruding from the second notch portion 26 to the outside.

Here, in the axial direction When stacked, the first terminal block section 49 and the second terminal block section 55 constitute the terminal block 7. Furthermore, a terminal block 7 protrudes outward from the opening 6 of the case 2.

(Support mechanism)
As shown in FIGS. 3, 4, and 5, the first leaf spring 17 has a circular outline when viewed from the axial direction X. As shown in FIGS. The first plate spring 17 includes a first movable body side fixing portion 61 to which the movable body 12 is connected in the central portion. The first movable body side fixing part 61 includes a first through hole 62 that penetrates in the axial direction X at the center. The first leaf spring 17 also includes first case-side fixing parts 63 fixed to the case 2 at both ends in the radial direction with the first movable body-side fixing part 61 therebetween. In this example, the first case-side fixing portion 63 is the outer peripheral edge of the first leaf spring 17. That is, the first case side fixing part 63 is annular and surrounds the first movable body side fixing part 61. Further, the first leaf spring 17 includes a plurality of first arm portions 64 that connect the first movable body side fixing portion 61 and the first case side fixing portion 63. The plurality of first arm parts 64 extend in the circumferential direction from the first movable body side fixing part 61 toward the first case side fixing part 63. The two first arm portions 64 that are adjacent to each other in the circumferential direction have overlapping portions that overlap when viewed from the radial direction.

As shown in FIG. 2 , the first leaf spring 17 has a first case-side fixing portion 63 fixed to the first annular surface portion 34 of the first case 21 . The first case-side fixing portion 63 and the first annular surface portion 34 are connected by welding. In the state where the first case side fixing part 63 is fixed to the first annular surface part 34, there is a gap between the first movable body side fixing part 61 and the first circular surface part 35 of the first case 21 in the axial direction L. There is a gap. When the state in which the first leaf spring 17 and the first coil bobbin 47 are fixed to the first case 21 is viewed from the axial direction It overlaps. There is a gap between the first case-side fixing part 63 and the first coil bobbin 47 in the axial direction L.

The second leaf spring 18 and the first leaf spring 17 are the same member. As shown in FIG. 5, the second plate spring 18 includes a second movable body side fixing portion 65 to which the movable body 12 is connected in the central portion. The second movable body side fixing part 65 includes a second through hole 66 that penetrates in the axial direction X at the center. Further, the second leaf spring 18 includes second case-side fixing parts 67 fixed to the case 2 at both ends in the radial direction with the second movable body-side fixing part 65 interposed therebetween. In this example, the second case-side fixing portion 67 is the outer peripheral edge of the second leaf spring 18 . That is, the second case side fixing part 67 is annular and surrounds the second movable body side fixing part 65. Further, the second plate spring 18 includes a plurality of second arm portions 68 that connect the second movable body side fixing portion 65 and the second case side fixing portion 67. The plurality of second arm parts 68 extend in the circumferential direction from the second movable body side fixing part 65 toward the second case side fixing part 67. The two second arm portions 68 that are adjacent to each other in the circumferential direction partially overlap when viewed from the radial direction.

As shown in FIG. 2 , the second leaf spring 18 has a second case-side fixing portion 67 fixed to the second annular surface portion 40 of the second case 22 . The second case-side fixing portion 67 and the second annular surface portion 40 are connected by welding. In the state in which the second case side fixing part 67 is fixed to the second annular surface part 40, there is a gap between the second movable body side fixing part 65 and the second circular surface part 41 of the second case 22 in the axial direction L. There is a gap. When the state where the second leaf spring 18 and the second coil bobbin 53 are fixed to the second case 22 is viewed from the axial direction X, the second case side fixing portion 67 of the second leaf spring 18 and the second coil 46 It overlaps with There is a gap between the second case-side fixing portion 67 and the second coil bobbin 53 in the axial direction L.

(movable body)
As shown in FIGS. 2 and 4, the movable body 12 includes a movable body main body 70 including a magnet 16, and a first magnetic member 71 fixed to the first leaf spring 17 in the first direction X1 of the movable body main body 70. , a second magnetic member 72 fixed to the second plate spring 18 in the second direction X2 of the movable body main body 70. As shown in FIG. 3, the movable body main body 70 has a cylindrical shape as a whole. The movable body main body 70 includes a first shaft portion 73 that protrudes in the first direction X1 from a central portion of the end surface in the first direction X1. Further, as shown in FIG. 2, the movable body main body 70 includes a second shaft portion 74 that protrudes in the second direction X2 from a central portion of the end surface in the second direction X2.

More specifically, the movable body main body 70 includes an annular first magnet 7 as the magnet 16.
7, an annular second magnet 78 disposed in the first direction X1 of the first magnet 77, and an annular third magnet 79 disposed in the second direction X2 of the first magnet 77. The first magnet 77, the second magnet 78, and the third magnet 79 are arranged coaxially. The first magnet 77, the second magnet 78, and the third magnet 79 have the same outer diameter. The first magnet 77, the second magnet 78, and the third magnet 79 have the same inner diameter dimension. The first magnet 77 is thicker in the axial direction X than the second magnet 78 and the third magnet 79. The second magnet 78 and the third magnet 79 are the same member.

Each of the first magnet 77, the second magnet 78, and the third magnet 79 has an S pole magnetized on the inner periphery side and an N pole magnet on the outer periphery side. Note that the first magnet 77, the second magnet 78, and the third magnet 79 may have their inner circumferential sides magnetized to the N pole, and their outer circumferential sides may be magnetized to the S pole.

Further, as shown in FIGS. 2 and 5, the movable body main body 70 includes a first annular member 81 disposed between a first magnet 77 and a second magnet 78, and a first magnet 77 and a third magnet 79. the second annular member 82 disposed between the center hole of the first magnet 77, the center hole of the second magnet 78, the center hole of the third magnet 79, the center hole of the first annular member 81, and the second A shaft member 83 extending through the center hole of the annular member 82 is provided. The first annular member 81 and the second annular member 82 are the same member. The outer diameter dimension of the first annular member 81 and the outer diameter dimension of the second annular member 82 are the same as the outer diameter dimensions of the first magnet 77 , the second magnet 78 , and the third magnet 79 . The inner diameter of the center hole of the first annular member 81 is the same as the inner diameter of the first magnet 77 , the second magnet 78 , and the third magnet 79 . As shown in FIG. 2, the first shaft portion 73 of the movable body main body 70 is a portion of the shaft member 83 that projects from the center of the second magnet 78 in the first direction X1. The second shaft portion 74 of the movable body main body 70 is a portion of the shaft member 83 that projects from the center of the third magnet 79 in the second direction X2.

The first magnetic member 71 and the second magnetic member 72 are made of metal. The first magnetic member 71 includes a first cylindrical portion 85 into which the first shaft portion 73 of the movable body main body 70 is movably inserted in the axial direction A suction part 86 is provided. The end surface of the first cylindrical portion 85 in the first direction X1 is fixed to the first movable body side fixing portion 61 of the first plate spring 17 . That is, the first cylindrical portion 85 is connected to the first movable body side fixed portion 61 by welding. In a state where the first cylindrical portion 85 and the first movable body side fixing portion 61 are connected, the center hole of the first cylindrical portion 85 and the first through hole 62 of the first movable body side fixing portion 61 communicate with each other.

The first suction portion 86 spreads toward the outer circumferential side from the end portion of the first cylinder portion 85 in the second direction X2. As shown in FIG. 5, the outline shape of the first suction portion 86 when viewed from the axial direction X is circular. As shown in FIG. 4, the outer diameter of the first suction portion 86 is the same as the outer diameter of the movable body main body 70. As shown in FIG. Further, the outer diameter of the first suction portion 86 is smaller than the outer diameter of the first leaf spring 17. When the state in which the first cylindrical portion 85 is fixed to the first movable body side fixing portion 61 is viewed from the axial direction It is located on the inside, and the first magnetic member 71 and the first case-side fixing part 63 do not overlap.

The movable body main body 70 is attracted to the first magnetic member 71 by the magnetic force of the magnet 16 . Thereby, the first magnetic member 71 and the movable body main body 70 become integrated. In the present invention, no adhesive means made of an adhesive layer is interposed between the first magnetic member 71 and the movable body main body 70. When the movable body main body 70 is attracted to the first magnetic member 71, the first magnetic member 71 and the movable body main body 70 are arranged coaxially. Further, when the movable body main body 70 is attracted to the first magnetic member 71, the end of the first shaft portion 73 in the first direction X1 is located inside the first cylindrical portion 85, as shown in FIG. . That is, the end of the first shaft portion 73 in the first direction X1 does not protrude from the first cylinder portion 85 in the first direction X1.

As shown in FIG. 2, the second magnetic member 72 is connected to a second cylindrical portion 88 into which the second shaft portion 74 of the movable body main body 70 is movably inserted in the axial direction A second suction part 89 is suctioned to 70. The end surface of the second cylindrical portion 88 in the second direction X2 is fixed to the second movable body side fixing portion 65 of the second plate spring 18 . That is, the second cylindrical portion 88 is connected to the second movable body side fixed portion 65 by welding. When the second cylindrical portion 88 and the second movable body side fixing portion 65 are connected, the center hole of the second cylindrical portion 88 and the second through hole 66 of the second movable body side fixing portion 65 communicate with each other.

The second suction portion 89 spreads toward the outer circumferential side from the end portion of the second cylinder portion 88 in the first direction X1. The outline shape of the second suction portion 89 when viewed from the axial direction X is circular. As shown in FIG. 4, the outer diameter of the second suction portion 89 is the same as the outer diameter of the movable body main body 70. As shown in FIG. Further, the outer diameter of the second suction portion 89 is smaller than the outer diameter of the second leaf spring 18 . When the state in which the second cylindrical portion 88 is fixed to the second movable body side fixing portion 65 is viewed from the axial direction It is located on the inner peripheral side, and the second magnetic member 72 and the second case-side fixing part 67 do not overlap.

The movable body main body 70 is attracted to the second magnetic member 72 by the magnetic force of the magnet 16. Thereby, the second magnetic member 72 and the movable body main body 70 become integrated. In the present invention, there is no bonding means made of an adhesive layer between the second magnetic member 72 and the movable body main body 70. When the movable body main body 70 is attracted to the second magnetic member 72, the second magnetic member 72 and the movable body main body 70 are arranged coaxially. Further, when the movable body main body 70 is attracted to the second magnetic member 72, the end of the second shaft portion 74 in the second direction X2 is located inside the second cylindrical portion 88, as shown in FIG. . That is, the end of the second shaft portion 74 in the second direction X2 does not protrude from the second cylinder portion 88 in the second direction X2.

(Assembling the linear motor)
FIG. 6 is an explanatory diagram of the assembly work of the linear motor 1. In FIG. 6, the linear motor 1 is shown cut along the axis L. As shown in FIG. 6, in the assembly work of the linear motor 1, first, the first plate spring 17 and the first magnetic member 71 are fixed. Specifically, the first cylindrical portion 85 of the first magnetic member 71 is connected to the first movable body side fixing portion 61 provided at the center of the first plate spring 17 by welding. Next, the first plate spring 17 and the first case 21 are fixed. Specifically, the first case-side fixing part 63 provided on the outer peripheral edge of the first plate spring 17 is connected to the first annular surface portion 34 of the first sealing part 4 of the first case 21 by welding. Thereafter, the first coil bobbin 47 around which the first coil 45 is wound is inserted into the first body 23 of the first case 21 . Then, the first coil bobbin 47 is fixed to the first body portion 23 with an adhesive or the like.

In addition, in parallel with fixing the first leaf spring 17 to the first case 21 and fixing the first coil 45 to the first case 21, the second leaf spring 18 and the second coil 46 are fixed to the second case 22. do. That is, the second plate spring 18 and the second magnetic member 72 are fixed. Specifically, the second cylindrical portion 88 of the second magnetic member 72 is connected to the second movable body side fixing portion 65 provided at the center of the second plate spring 18 by welding. Next, the second leaf spring 18 and the second case 22 are fixed. Specifically, the second case-side fixing portion 67 provided on the outer peripheral edge of the second plate spring 18 is connected to the second annular surface portion 40 of the second sealing portion 5 of the second case 22 by welding. Thereafter, the second coil bobbin 53 around which the second coil 46 is wound is inserted into the second body 24 of the second case 22 . Then, the second coil bobbin 53 is fixed to the second body 24 with an adhesive or the like.

Thereafter, the first case 21 and the second case 22 are faced to each other in the axial direction X, and the movable body main body 70 is arranged between the first magnetic member 71 and the second magnetic member 72. Thereafter, as shown by the arrow in FIG. 6, the first case 21 and the second case 22 are brought close to each other in the axial direction 85 , and the second shaft portion 74 of the movable body main body 70 is inserted into the second cylindrical portion 88 of the second magnetic member 72 . Then, the first body part 23 of the first case 21 and the second body part 24 of the second case 22 are joined to form the case 2.

Here, with the first shaft part 73 inserted into the first cylinder part 85 of the first magnetic member 71 and the second shaft part 74 inserted into the second cylinder part 88 of the second magnetic member 72, the first case 21 and the second case 22 are brought close to each other, the first magnetic member 71 and the second magnetic member 72 have their attracting parts (the first attracting part 86 and the second attracting part 89) movable by the magnetic force of the magnet 16. It is naturally adsorbed to the main body 70. Thereby, as shown in FIG. 2, the first magnetic member 71, the second magnetic member 72, and the movable body main body 70 are integrated to form the movable body 12. Therefore, the movable body 12 is supported by the fixed body 15 via the support mechanism 13 (first leaf spring 17 and second leaf spring 18).

With the first shaft portion 73 inserted into the first cylindrical portion 85 of the first magnetic member 71 and the second shaft portion 74 inserted into the second cylindrical portion 88 of the second magnetic member 72, the first magnetic member 71 When the second magnetic member 72 is attracted to the movable body main body 70, the movable body 12 opens a predetermined gap with the coil 11 on the inner peripheral side of the coil 11 (first coil 45 and second coil 46). placed in place.

Further, when the first magnetic member 71 and the second magnetic member 72 are attracted to the movable body main body 70 to form the movable body 12, the movable body 12 is operated by the elastic return force of the first plate spring 17 and the second plate spring. It will be in a state where it is supported at a balance position where the elastic return force of 18 is balanced. Thereby, the initial position of the movable body 12 in the axial direction X is defined. In the balance position (initial position), the first annular member 81 of the movable body 12 faces the first coil 45 in the radial direction. Further, the second annular member 82 of the movable body 12 faces the second coil 46 in the radial direction.

As shown in FIG. 2, when the movable body 12 is supported by the fixed body 15 via the support mechanism 13 (the first plate spring 17 and the second plate spring 18), when viewed from the axial direction The first circular surface portion 35 of the first sealing surface 33 of the first sealing portion 4 becomes a first overlapping surface portion that overlaps with the first movable body side fixing portion 61 . Here, the first case-side fixing portion 63 of the first leaf spring 17 is fixed to the first annular surface portion 34 located on the outer peripheral side of the first circular surface portion 35 (first overlapping surface portion), and The first circular surface portion 35 (first overlapping surface portion) is set back from the first annular surface portion 34 in the first direction X1 away from the movable body 12. Therefore, when the movable body 12 is displaced in the axial direction X and the first leaf spring 17 is bent in the first direction X1, it is possible to prevent the first blocking portion 4 and the first leaf spring 17 from coming into contact with each other. Therefore, a long movement range of the movable body 12 can be ensured.

Similarly, when the movable body 12 is supported by the fixed body 15 via the support mechanism 13 (the first leaf spring 17 and the second leaf spring 18) when viewed from the axial direction The second circular surface portion 41 of the second sealing surface 39 becomes a second overlapping surface portion that overlaps with the second movable body side fixing portion 65 . Here, the second case-side fixing portion 67 of the second leaf spring 18 is fixed to the second annular surface portion 40 located on the outer peripheral side of the second circular surface portion 41 (second overlapping surface portion), and The two circular surface portions 41 (second overlapping surface portions) are set back in the second direction X2 away from the movable body 12 than the second annular surface portions 40 are. Therefore, when the movable body 12 is displaced in the axial direction X and the second leaf spring 18 is bent in the second direction X2, it is possible to prevent the second blocking portion 5 and the second leaf spring 18 from coming into contact with each other. Therefore, a long movement range of the movable body 12 can be ensured.

(effect)
According to the present invention, the movable body 12 includes a first magnetic member 71 , a second magnetic member 72 , and a movable body main body 70 having the magnet 16 . Further, the first magnetic member 71 is fixed to the first leaf spring 17 , and the movable body main body 70 is attracted to the first magnetic member 71 by the magnetic force of the magnet 16 . The second magnetic member 72 is fixed to the second leaf spring 18 , and the movable body main body 70 is attracted to the second magnetic member 72 by the magnetic force of the magnet 16 . Therefore, in the assembling work in which the first leaf spring 17 is bridged between the movable body 12 and the fixed body 15, the first magnetic member 71 and the movable body main body 70 are separated, and the first leaf spring 17 and the first leaf spring 17 are separated from each other. 1 magnetic member 71 can be connected. In addition, in the assembly work in which the second plate spring 18 is bridged between the movable body 12 and the fixed body 15, the second magnetic member 72 and the movable body main body 70 are separated, and the second plate spring 18 and the second plate spring 18 are separated from each other. Two magnetic members 72 can be connected. Furthermore, the movable body body 70 including the magnet 16 is arranged between the first magnetic member 71 and the second magnetic member 72, and the movable body body 70 is attracted to the first magnetic member 71 and the second magnetic member 72. For example, the movable body 12 can be configured. Therefore, interference between the magnet 16 and the fixed body 15 can be avoided in the assembly work in which the first leaf spring 17 is bridged between the movable body 12 and the fixed body 15. Further, in the assembly work in which the second plate spring 18 is bridged between the movable body 12 and the fixed body 15, interference between the magnet 16 and the fixed body 15 can be avoided.
Therefore, the assembly work of spanning the leaf springs (the first leaf spring 17 and the second leaf spring 18) between the movable body 12 and the fixed body 15 becomes easy.

Further, the first shaft portion 73 of the movable body main body 70 is inserted into the first cylindrical portion 85 of the first magnetic member 71 so that the movable body main body 70 is attracted to the first magnetic member 71, and the second shaft portion 74 is When the movable body body 70 is inserted into the second cylindrical portion 88 of the magnetic member 72 and is attracted to the second magnetic member 72, the movable body body 70 including the magnet 16 is placed at a predetermined position on the inner circumferential side of the coil 11. Placed. Therefore, the gap between the coil 11 and the magnet 16 can be defined.

Furthermore, when manufacturing the linear motor 1, the first shaft portion 73 of the movable body body 70 is inserted into the first cylindrical portion 85 of the first magnetic member 71, and the movable body body 70 is attracted to the first magnetic member 71. , and if the second shaft portion 74 of the movable body main body 70 is inserted into the second cylindrical portion 88 of the second magnetic member 72 and the movable body main body 70 is attracted to the second magnetic member 72, the movable body 12 becomes It is supported at a balanced position where the elastic return force of the first plate spring 17 and the elastic return force of the second plate spring 18 are balanced. Therefore, the initial position of the movable body 12 in the axial direction X can be defined.

Further, the first leaf spring 17 includes a first movable body side fixing part 61 fixed to the first magnetic member 71 at the center part in the radial direction perpendicular to the axis L, and has a first movable body side fixing part 61 in between. A first case-side fixing portion 63 fixed to the case 2 is provided at both ends in the radial direction. Further, when viewed from the axial direction X, the first magnetic member 71 and the first case-side fixing portion 63 do not overlap. Therefore, it is easy to fix the first leaf spring 17 to the case 2, with the first magnetic member 71 fixed to the center portion. Similarly, the second leaf spring 18 includes a second movable body-side fixing portion 65 fixed to the second magnetic member 72 at the center portion in the radial direction perpendicular to the axis L, and the second movable body-side fixing portion 65 is interposed between the second movable body-side fixing portions 65 and A second case-side fixing part 67 fixed to the case 2 is provided at both ends in the radial direction. Further, when viewed from the axial direction X, the second magnetic member 72 and the second case-side fixing portion 67 do not overlap. Therefore, it is easy to fix the second leaf spring 18 to the case 2, to which the second magnetic member 72 is fixed.

Further, the case 2 is composed of a first case 21 and a second case 22, which are divided into two parts in the axial direction X. Therefore, it is easy to connect the first plate spring 17 to which the first magnetic member 71 is fixed to the first sealing part 4 of the first case 21. Furthermore, it is easy to connect the second plate spring 18 to which the second magnetic member 72 is fixed to the second sealing part 5 of the second case 22.

Further, the case 2 is composed of a first case 21 and a second case 22, which are divided into two in the axial direction X. Therefore, when manufacturing the linear motor 1, the first magnetic member 71 fixed to the case 2 via the first plate spring 17, and the second magnetic member 72 fixed to the case 2 via the second plate spring 18. By arranging the movable body main body 70 between them, the movable body main body 70 can be attracted to the first magnetic member 71 and the second magnetic member 72. Therefore, manufacturing of the linear motor 1 is easy.

Furthermore, since the case 2 is divided, the first coil 45 is held inside the first body part 23 of the first case 21, and the second coil 46 is held inside the second body part 24 of the second case 22. Easy to hold.

Further, the first coil 45 is wound around a first coil bobbin 47, and the first coil bobbin 47 is fixed to the first body portion 23. Therefore, compared to the case where the first coil 45 is directly fixed to the case 2, the position of the first coil 45 can be defined more accurately. Similarly, the second coil 46 is wound around a second coil bobbin 53, and the second coil bobbin 53 is fixed to the second body section 24. Therefore, compared to the case where the second coil 46 is directly fixed to the case 2, the position of the second coil 46 can be defined more accurately.

Here, in the present invention, the magnet 16 includes a first annular magnet 77, a second annular magnet 78 disposed in the first direction X1 of the first magnet 77, and a second annular magnet 78 disposed in the second direction X2 of the first magnet 77. It has an annular third magnet 79 arranged therein. The movable body main body 70 includes a first annular member 81 disposed between the first magnet 77 and the second magnet 78 and a second annular member 82 disposed between the first magnet 77 and the third magnet 79. and a shaft extending through the center hole of the first magnet 77, the center hole of the second magnet 78, the center hole of the third magnet 79, the center hole of the first annular member 81, and the center hole of the second annular member 82. A member 83 is provided. The first shaft portion 73 is a portion of the shaft member 83 that protrudes from the second magnet 78 in the first direction X1, and the second shaft portion 74 is a portion of the shaft member 83 that protrudes from the third magnet 79 in the second direction X2. This is the part that stands out. Therefore, it is easy to provide the first shaft portion 73 and the second shaft portion 74 on the movable body main body 70.

DESCRIPTION OF SYMBOLS 1... Linear motor, 2... Case, 3... Body, 4... First blocking part, 5... Second blocking part, 6... Opening, 7... Terminal block, 11... Coil, 12... Movable body, 13... Support Mechanism, 15... Fixed body, 16... Magnet, 17... First leaf spring, 18... Second leaf spring, 21... First case, 22... Second case, 23... First body, 24... Second body. , 25...first notch part, 26...second notch part, 31...first large diameter part, 32...first small diameter part, 33...first sealing surface, 34...first annular surface part, 35...th 1 circular surface portion, 36... first annular wall surface, 37... second large diameter portion, 38... second small diameter portion, 39... second sealing surface, 40... second annular surface portion, 41... second circular surface portion, 42... Second annular wall surface, 45... First coil, 46... Second coil, 47... First coil bobbin, 48... First annular part, 49... First terminal block part, 50... First terminal pin, 53... First 2 coil bobbin, 54... second annular part, 55... second terminal block part, 56... second terminal pin, 61... first movable body side fixing part, 62... first through hole, 63... first case side fixing part, 64...First arm part, 65...Second movable body side fixing part, 66...Second through hole, 67...Second case side fixing part, 68...Second arm part, 70...Movable body main body, 71...First magnetism Member, 72... Second magnetic member, 73... First shaft portion, 74... Second shaft portion, 77... First magnet, 78... Second magnet, 79... Third magnet, 81... First annular member, 82... Second annular member, 83... Shaft member, 85... First cylindrical part, 86... First adsorption part, 88... Second cylindrical part, 89... Second adsorption part, X... Axial direction, X1... First direction, X2 ...Second direction

Claims (9)

A fixed body including a coil, a movable body including a magnet located on the inner peripheral side of the coil, and a support mechanism that supports the movable body so as to be displaceable in a direction along the axis of the coil, A linear motor that moves the movable body in the axial direction by supplying power to a coil,
When the direction along the axis of the coil is an axial direction, one of the axial directions is a first direction, and the other is a second direction,
The support mechanism includes a first plate spring spanned between the fixed body and the movable body with the thickness direction facing the axial direction,
The movable body includes a movable body body including the magnet, and a first magnetic member fixed to the first leaf spring in the first direction of the movable body body,
The movable body main body includes a first shaft portion protruding in the first direction,
The first magnetic member includes a first cylindrical portion into which the first shaft portion is movably inserted in the axial direction, and a first adsorption portion that is adsorbed to the movable body main body by the magnetic force of the magnet. ,
The first leaf spring includes a first movable body side fixing portion in a radial center portion perpendicular to the axis,
A linear motor , wherein the first movable body side fixing part is fixed to the first cylinder part . The fixed body includes a case that accommodates the movable body, the support mechanism, and the coil,
2. The linear motor according to claim 1, further comprising a first case-side fixing part fixed to the case at both ends in the radial direction with the first movable body-side fixing part therebetween. The case includes a cylindrical body located on the outer peripheral side of the coil, and a first sealing part that seals an end of the body in the first direction,
The first sealing surface facing in the second direction in the first sealing portion includes a first overlapping surface portion that overlaps with the first movable body side fixing portion when viewed from the axial direction, and an outer periphery of the first overlapping surface portion. a first annular surface portion located on a side in the second direction of the first overlapping surface portion;
3. The linear motor according to claim 2, wherein the first case side fixing part is fixed to the first annular surface part. The support mechanism includes a second leaf spring spanned between the fixed body and the movable body with the thickness direction oriented in the axial direction at a position spaced apart from the first leaf spring in the second direction. ,
The movable body includes a second magnetic member fixed to the second leaf spring in the second direction of the movable body main body,
The movable body main body includes a second shaft portion protruding in the second direction,
The second magnetic member includes a second cylindrical portion into which the second shaft portion is movably inserted in the axial direction, and a second adsorption portion that is adsorbed to the movable body main body by the magnetic force of the magnet. The linear motor according to claim 3, characterized in that: The second leaf spring includes a second movable body-side fixing portion fixed to the second magnetic member at the radial center portion, and both radial end portions with the second movable body-side fixing portion sandwiched therebetween. 5. The linear motor according to claim 4, further comprising a second case-side fixing portion fixed to the case. The case includes a second sealing part that seals an end of the body in the second direction,
The second sealing surface facing in the first direction in the second sealing portion includes a second overlapping surface portion that overlaps with the second movable body side fixing portion when viewed from the axial direction, and an outer periphery of the second overlapping surface portion. a second annular surface portion located on the side in the first direction of the second overlapping surface portion;
6. The linear motor according to claim 5, wherein the second case side fixing part is fixed to the second annular surface part. The case includes a first case and a second case that are divided in the middle of the body in the axial direction,
The first case includes the first sealing part and a first body part,
The second case includes the second sealing part and a second body part,
7. The first body part and the second body part constitute the body part when the first case and the second case are overlapped in the axial direction. linear motor. The coil includes a first coil and a second coil coaxially arranged in the second direction of the first coil,
The first coil is wound around a first coil bobbin,
The second coil is wound around a second coil bobbin,
The first coil bobbin is fixed to the first body,
The linear motor according to claim 7, wherein the second coil bobbin is fixed to the second body. The magnets include a first annular magnet, a second annular magnet arranged in the first direction of the first magnet, and a third annular magnet arranged in the second direction of the first magnet; has
The movable body main body includes a first annular member disposed between the first magnet and the second magnet, a second annular member disposed between the first magnet and the third magnet, a shaft member extending through the center hole of the first magnet, the center hole of the second magnet, the center hole of the third magnet, the center hole of the first annular member, and the center hole of the second annular member; , comprising;
The first shaft portion is a portion of the shaft member that protrudes from the second magnet in the first direction,
The linear motor according to claim 8, wherein the second shaft portion is a portion of the shaft member that projects from the third magnet in the second direction.

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