actuator

Abstract

The present application provides an actuator having strength required for a fixing portion that constitutes a cylindrical member and a cover member of a cylindrical housing. The housing of the actuator has a cylindrical member and a first cover member that closes an opening of one side of the cylindrical member. A fixing portion that fixes the first cover member and the cylindrical member has: a first protrusion that protrudes from the first cover member to an outer peripheral side; a second protrusion that protrudes from the first cover member to the outer peripheral side in a second direction of the first protrusion; a first recess that is provided to an inner peripheral surface of the cylindrical member and into which the first protrusion is inserted; and a second recess into which the second protrusion is inserted. In a state before the first protrusion is inserted into the first recess, a first protrusion width dimension of the first protrusion is greater than a first recess width dimension of the first recess, and a second protrusion width dimension of the second protrusion is greater than a second recess width dimension of the second recess.

Description

Technical Field

[0001] The present invention relates to an actuator in which a movable body vibrates within a housing. Background Art

[0002] Such an actuator is described in Patent Document 1. The actuator described in this document comprises: a support body having a housing; a movable body housed in the housing; a connecting member connecting the housing and the movable body so as to be movable relative to each other; and a magnetic drive mechanism that moves the movable body relative to the support body. The support body comprises a retaining frame fixed to the housing and a coil retained by the retaining frame. The movable body comprises a yoke and a magnet fixed to the yoke and opposed to the coil. The connecting member is a viscoelastic body and is disposed between the housing and the yoke. The magnetic drive mechanism is composed of the coil of the support body and the magnet of the movable body.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-13086 Summary of the Invention

[0006] Technical problem to be solved by the invention

[0007] The inventors have proposed an actuator that houses a movable body in a cylindrical housing and causes the movable body to vibrate along the axis of the housing. In such an actuator, the housing includes a cylindrical component located on the outer peripheral side of the movable body and a cover component that closes the opening of the cylindrical component in the axial direction. The connecting component that connects the movable body and the supporting body includes: an annular viscoelastic body; an inner frame component fixed to the end face of the inner peripheral side of the viscoelastic body; and an outer frame component fixed to the end face of the outer peripheral surface of the viscoelastic body. The connecting component is coaxially arranged with the housing. The inner frame component of the connecting component is connected to the movable body. The outer frame component is retained from the radial outside and one side in the axial direction by a retaining frame fixed to the cylindrical component. The cover component abuts against the outer frame component from the other side in the axial direction. The cover component prevents the viscoelastic body from being exposed outside the housing and prevents the outer frame component from moving to the other side in the axial direction.

[0008] In such an actuator, when an external impact such as from being dropped is applied, the external force acts on the movable body, causing it to move within the housing. Furthermore, as the movable body moves, the force acting on the movable body is transmitted to the cover member via the connecting member. Therefore, when the actuator is subjected to an external impact, an axial load is applied to the cover member. Therefore, in such an actuator, to prevent the cover member from falling off the barrel member when subjected to an external impact, the fixing portion between the barrel member and the cover member must be strong.

[0009] The present application has been made in view of the above problems, and has as its object to provide an actuator in which a fixing portion of a cylindrical member and a lid member that constitute a cylindrical case has strength.

[0010] Technical solution adopted to solve the technical problem

[0011] To solve the above problems, the actuator of the present application is characterized by having: a case having a cylindrical member and a lid member that is inserted into the cylindrical member and closes an opening of one side in an axial direction of the cylindrical member; a movable body housed in the case; a connecting member that connects the movable body and the case so as to be relatively movable in the axial direction; and a magnetic drive mechanism that causes the movable body to vibrate relative to the case in the axial direction, the case having a plurality of fixing portions that fix the lid member to the cylindrical member, the lid member having an abutting portion that abuts against the connecting member from the first direction side when one side in the axial direction is set as a first direction and the other side is set as a second direction, each fixing portion having: a first protrusion that protrudes outward in a circumferential direction of the lid member from a portion of the circumferential direction; a second protrusion that protrudes outward in the second direction from the portion of the circumferential direction of the lid member; a first recess that is provided on an inner peripheral surface of the cylindrical member and into which the first protrusion is inserted; and a second recess that is provided on the inner peripheral surface of the cylindrical member and into which the second protrusion is inserted, each of a pair of first end surfaces of the first protrusion located at both ends in the circumferential direction being in contact with each of a pair of first side walls of the first recess that are opposed in the circumferential direction, each of a pair of second end surfaces of the second protrusion located at both ends in the circumferential direction being in contact with each of a pair of second side walls of the second recess that are opposed in the circumferential direction, a first contact area at which each first end surface is in contact with each first side wall being larger than a second contact area at which each second end surface is in contact with each second side wall, a first protrusion width dimension between the pair of first end surfaces in the circumferential direction being larger than a first recess width dimension between the pair of first side walls in the circumferential direction in a state before the first protrusion is inserted into the first recess, and a second protrusion width dimension between the pair of second end surfaces in the circumferential direction being larger than a second recess width dimension between the pair of second side walls in the circumferential direction.

[0012] In the present application, a first protrusion and a second protrusion that protrude outward in the circumferential direction are provided on the cap member, and a first recess into which the first protrusion is inserted and a second recess into which the second protrusion is inserted are provided on the inner circumferential surface of the barrel member. In addition, in a state before the first protrusion is inserted into the first recess, the first protrusion width dimension of the first protrusion is larger than the first recess width dimension of the first recess, and the second protrusion width dimension of the second protrusion is larger than the second recess width dimension of the second recess. Therefore, when the cap member is inserted into the barrel member and fixed, in each fixing portion, the first protrusion is pressed into the first recess, and the second protrusion is pressed into the second recess. Therefore, by the plurality of fixing portions, a strength with which the cap member does not fall off from the barrel member can be obtained. In addition, two pressing sites are provided in each fixing portion. Therefore, even in a case where the first protrusion or the second protrusion is broken due to an impact from the outside and the pressing sites become one, the cap member can be prevented from falling off from the barrel member. Furthermore, a first contact area in which the first end surface of the first protrusion contacts the first side wall of the first recess is larger than a second contact area in which the second end surface of the second protrusion contacts the second side wall of the second recess. Thus, the frictional force between the first end surface of the first protrusion and the first side wall of the first recess becomes large, and thus the cap member is more easily prevented from falling off from the barrel member. Here, in an actuator, when vibration of a movable body is transmitted to the cap member via a connecting member, there is a problem in that the cap member rotates around the axis due to the vibration, and the cap member easily falls off from the barrel member. In this regard, in the present application, the first contact area in which the first end surface of the first protrusion contacts the first side wall of the first recess is larger than the second contact area in which the second end surface of the second protrusion contacts the second side wall of the second recess. Therefore, by the contact of the first end surface of the first protrusion with the first side wall of the first recess, the cap member can be prevented from rotating with respect to the barrel member, and the cap member can be prevented from easily falling off from the barrel member.

[0013] In addition, when the first end surface of the first protrusion and the second end surface of the second protrusion overlap, and the first side wall of the first recess and the second side wall of the second recess overlap, as viewed in the axis direction, the first end surface of the first protrusion and the second end surface of the second protrusion are arranged in a straight line in the axis direction, and the first side wall of the first recess and the second side wall of the second recess are arranged in a straight line in the axis direction. In this case, when a force in the axis direction is applied to the cap member, there is a problem in that each of the first protrusion and the second protrusion easily falls off from the first recess and the second recess in the axis direction. In this regard, in the present application, it can be configured that each of the first end surface and the second end surface is located at a different position in the circumferential direction, and each of the first side wall and the second side wall is located at a different position in the circumferential direction. In this way, the first end surface and the second end surface are not arranged in a straight line in the axis direction, and the first side wall and the second side wall are not arranged in a straight line in the axis direction. Therefore, the cap member can be easily prevented from falling off from the barrel member.

[0014] In the present invention, it can be set that the width dimension of the first protrusion is longer than the width dimension of the second protrusion, the width dimension of the first recess is longer than the width dimension of the second recess, and when observed from the axial direction, the second protrusion is located on the circumferential inner side of the first protrusion, and the second recess is located in the second direction of the first recess, and is connected to the first recess in the axial direction. In this way, in each fixing part, the first protrusion and the second protrusion are arranged in overlapping positions. Therefore, by pressing each fixing part in the second direction, the first protrusion and the second protrusion can be inserted into the first recess and the second recess. In addition, when observed from the first direction side, the second protrusion is located on the inner side of the first protrusion. Therefore, when observing the state in which the cover part is fixed to the barrel part from the first direction side, the first protrusion can be used to hide the second protrusion and the second groove for inserting the second protrusion.

[0015] In the present invention, the first press-in allowance obtained by deducting the first recess width dimension from the first protrusion width dimension can be set to be less than the second press-in allowance obtained by deducting the second recess width dimension from the second protrusion width dimension. In this way, by pressing the second protrusion into the second recess away from the open end of the barrel component, the strength of each fixing portion can be ensured. Therefore, the first cover component is difficult to fall off from the barrel component. In addition, in this way, when the first protrusion is pressed into the first recess on the side close to the open end of the barrel component, the deformation of the open end of the barrel component can be prevented or suppressed.

[0016] In the present invention, it can be set that the first protrusion protrudes further toward the outer peripheral side than the second protrusion, and the first recess is recessed deeper toward the outer peripheral side than the second recess. In this way, it is easy to make the first contact area where the circumferential first end face of the first protrusion contacts the first side wall of the first recess larger than the second contact area where the circumferential second end face of the second protrusion contacts the second side wall of the second recess. As a result, it is easy to increase the friction between the first end face of the first protrusion and the first side wall of the first recess, so it is easier to prevent the cover component from falling off from the barrel component. In addition, since the first contact area between the first end face of the first protrusion and the first side wall of the first recess becomes larger, when the vibration of the movable body is transmitted to the cover component, it is possible to prevent the cover component from rotating relative to the barrel component.

[0017] In the present application, the first end surface of each first protrusion can be curved, and the first side wall of each first recess can be a transfer surface on which the shape of the curved surface is transferred. In this way, the first contact area of the first end surface of the first protrusion in contact with the first side wall of the first recess can be larger than the second contact area of the second end surface of the second protrusion in contact with the second side wall of the second recess. Thus, the frictional force between the first end surface of the first protrusion and the first side wall of the first recess can be increased, and the cap member can be more easily prevented from falling off the barrel member. In addition, when the vibration of the movable body is transmitted to the cap member, the cap member can be prevented from rotating with respect to the barrel member.

[0018] In the present application, it is preferable that the fixing portions be provided at equal angular intervals. In this way, the strength of the cap member to prevent the cap member from falling off the barrel member can be easily ensured by the plurality of fixing portions.

[0019] In the present application, a retainer that is fixed to the inside of the housing can be provided, the connecting member can include a ring-shaped viscoelastic body that expands in the radial direction, an inner frame portion that is fixed to an end surface on the inner circumferential side of the viscoelastic body, and an outer frame portion that is fixed to an end surface on the outer circumferential side of the viscoelastic body, and the retainer can hold the outer frame portion from the outer circumferential side and the second direction side, the inner frame portion can be connected to the movable body, and the abutting portion can abut against the outer frame portion. In this way, the outer frame portion of the connecting member can be held in a state in which the outer frame portion cannot move in the axial direction by the cap member and the retainer that constitute the support body. In addition, the viscoelastic body of the connecting member can be prevented from being exposed to the outside of the housing by the cap body.

[0020] Effects of the Invention

[0021] In the present application, the first protrusion and the second protrusion provided in the cap member are pressed into the first groove and the second groove provided in the inner circumferential surface of the barrel member. Thus, the strength of the cap member to prevent the cap member from falling off the barrel member can be ensured by the plurality of fixing portions that fix the cap member and the barrel member. In addition, two press-in portions are provided in the fixing portions. Thus, even when the first protrusion or the second protrusion is broken due to an impact from the outside and the press-in portions become one, the cap member can be prevented from falling off the barrel member. Furthermore, the first contact area of the first end surface of the first protrusion in contact with the first side wall of the first recess can be larger than the second contact area of the second end surface of the second protrusion in contact with the second side wall of the second recess. Thus, the frictional force between the first end surface of the first protrusion and the first side wall of the first recess can be increased, and the cap member can be more easily prevented from falling off the barrel member. In addition, the cap member can be prevented from rotating with respect to the barrel member. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of an actuator according to an embodiment of the present application.

[0023] Figure 2 is an exploded perspective view of the actuator.

[0024] Figure 3 is an A-A sectional view of Figure 1

[0025] Figure 4 is a B-B sectional view of Figure 1

[0026] Figure 5 is an explanatory view of the fixing portion.

[0027] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0028] 1... actuator; 2... support body; 3... movable body; 4... coil holder; 5... housing; 6... magnetic drive mechanism; 7... wiring substrate; 8... lead wire; 10... viscoelastic body; 11... first connecting member; 12... second connecting member; 20... cylindrical member; 21... first cover member; 22... second cover member; 25... connecting member holding portion; 27... fixing portion; 30... support shaft; 31... first magnetic yoke; 32... second magnetic yoke; 33... first magnetic member; 34... second magnetic member; 35... yoke; 36... first inner frame member; 37... second inner frame member; 38... weight adjustment portion; 40... coil holding portion; 41... connecting member holding portion; 43... first recess; 44... first step portion; 45... second step portion; 46... second recess; 51... first outer frame member; 52... second outer frame member; 60... wiring lead-out portion; 61... magnet; 62... coil; 63... coil wire; 64... terminal pin; 65... notch portion; 66... cover portion; 69... substrate holding portion; 70... lead wire holding portion; 71... hole; 81... first protrusion; 81a... first end surface; 82... second protrusion; 82a... second end surface; 83... protrusion side step portion; 91... first recess; 91a... first side wall; 91b... first peripheral wall; 92... second recess; 92a... second side wall; 92b... second peripheral wall; 93... groove portion side step portion; 310... shaft hole of first magnetic yoke; 330... shaft hole of first magnetic member; 331... end plate portion; 332... bent portion; 333... cylindrical portion; 340... shaft hole of second magnetic member; 361... annular protrusion of first inner frame member; 371... annular protrusion of second inner frame member; 214, 610... shaft hole of magnet; D1... first protrusion width dimension; D2... second protrusion width dimension; E1... first recess width dimension; E2... second recess width dimension; F1... first contact area; F2... second contact area; L... axis of housing; X... axis direction. DETAILED DESCRIPTION

[0029] (Overall Structure)

[0030] ​​An embodiment of the present application will be described below with reference to the drawings. Figure 1 is a perspective view of an actuator 1 of an embodiment of the present application. Figure 2 is Figure 1 is an exploded perspective view of the actuator 1 shown in Figure 3 , Figure 4 is Figure 1 is a sectional view of the actuator 1 shown in Figure 3 is a sectional view taken at the A-A position of Figure 1 . Figure 4 is a sectional view taken at the B-B position of Figure 1 . Figure 4 is a sectional view taken in a direction orthogonal to Figure 3 .

[0031] As shown in Figure 1 , the actuator 1 has a cylindrical appearance. As shown in Figure 3 , Figure 4 , the actuator 1 includes a support body 2 having a cylindrical housing 5, a movable body 3 housed in the housing 5, and first and second connecting members 11 and 12 connecting the support body 2 and the movable body 3 so as to be relatively movable in an axial direction X along an axis L of the housing 5. The first connecting member 11 connects the movable body 3 and the support body 2 in one end portion of the axial direction X within the housing 5. The second connecting member 12 connects the movable body 3 and the support body 2 in the other end portion of the axial direction within the housing 5.

[0032] Further, the actuator 1 includes a magnetic drive mechanism 6 that moves the movable body 3 in the axial direction X. The magnetic drive mechanism 6 includes a magnet 61 provided to the movable body 3 and a coil 62 provided to the support body 2. In the following description, one side of the axial direction X is referred to as a first direction XI, and the other side of the axial direction X is referred to as a second direction X2.

[0033] (First and second connecting members)

[0034] As shown in Figure 2As shown in FIG. 1, the first connecting member 11 includes a ring-shaped viscoelastic body 10, a first inner frame member 36 fixed to an end surface on the inner peripheral side of the viscoelastic body 10, and a first outer frame member 51 fixed to an end surface on the outer peripheral side of the viscoelastic body 10. The viscoelastic body 10 is joined to the first inner frame member 36 and the first outer frame member 51 by adhesion of the viscoelastic body 10 itself. The first inner frame member 36 is fixed to the movable body 3, and the first outer frame member 51 is held to the support body 2. The second connecting member 12 includes a ring-shaped viscoelastic body 10, a second inner frame member 37 fixed to an end surface on the inner peripheral side of the viscoelastic body 10, and a second outer frame member 52 fixed to an end surface on the outer peripheral side of the viscoelastic body 10. The viscoelastic body 10 is joined to the second inner frame member 37 and the second outer frame member 52 by adhesion of the viscoelastic body 10 itself. The second inner frame member 37 is fixed to the movable body 3, and the second outer frame member 52 is held to the support body 2.

[0035] As the viscoelastic body 10, a gel-like member made of a silicone gel or the like, natural rubber, diene rubber (for example, styrene-butadiene rubber, isoprene rubber, butadiene rubber, chlorobutadiene rubber, acrylonitrile-butadiene rubber, or the like), non-diene rubber (for example, butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, polyurethane rubber, silicone rubber, fluororubber, or the like), a thermoplastic elastomer, or the like, or a modified material thereof can be used. Alternatively, the viscoelastic body 10 can be a composite member in which a gel-like member, rubber, or a modified material thereof is combined with an elastic body such as a spring.

[0036] (Support body)

[0037] The support body 2 includes a housing 5 and a coil holder 4 fixed to the inner side of the housing 5. As shown in FIG. 1, the housing 5 includes a cylindrical tube member 20, a first cover member 21 that closes an opening of a first direction X1 of the axis direction X of the tube member 20, and a second cover member 22 that closes an opening of a second direction X2 of the axis direction X of the tube member 20. The coil holder 4 is cylindrical and is coaxially arranged with the housing 5. As shown in FIG. 1, the coil holder 4 is located between the first cover member 21 and the second cover member 22 on the inner peripheral side of the tube member 20. The coil holder 4 holds a coil 62 and holds the first outer frame member 51 of the first connecting member 11. Figure 1 Figure 2 As shown in FIG. 1, the housing 5 includes a cylindrical tube member 20, a first cover member 21 that closes an opening of a first direction X1 of the axis direction X of the tube member 20, and a second cover member 22 that closes an opening of a second direction X2 of the axis direction X of the tube member 20. The coil holder 4 is cylindrical and is coaxially arranged with the housing 5. As shown in FIG. 1, the coil holder 4 is located between the first cover member 21 and the second cover member 22 on the inner peripheral side of the tube member 20. The coil holder 4 holds a coil 62 and holds the first outer frame member 51 of the first connecting member 11. Figure 3 Figure 4 As shown in FIG. 1, the housing 5 includes a cylindrical tube member 20, a first cover member 21 that closes an opening of a first direction X1 of the axis direction X of the tube member 20, and a second cover member 22 that closes an opening of a second direction X2 of the axis direction X of the tube member 20. The coil holder 4 is cylindrical and is coaxially arranged with the housing 5. As shown in FIG. 1, the coil holder 4 is located between the first cover member 21 and the second cover member 22 on the inner peripheral side of the tube member 20. The coil holder 4 holds a coil 62 and holds the first outer frame member 51 of the first connecting member 11.

[0038] In addition, the support body 2 includes a ring-shaped connecting member holding portion 25 protruding from the inner peripheral surface of the tube member 20. The connecting member holding portion 25 is located between the coil holder 4 and the second cover member 22 in the axis direction X. The connecting member holding portion 25 holds the second outer frame member 52 of the second connecting member 12.

[0039] (Tube member, first cover member, and second cover member)​​

[0040] The cylindrical member 20 is made of resin. As shown in Figure 2 , the cylindrical member 20 has a notch portion 65 in which an edge in a first direction XI of the axis direction X is cut in a second direction X2. Further, the cylindrical member 20 has a wiring board holding portion 69 in the second direction X2 of the notch portion 65. The wiring board 7 is fixed to the wiring board holding portion 69. The lead 8 for power supply is electrically connected to the wiring board 7. A lead holding portion 70 holding the lead 8 is provided at a position adjacent to the wiring board 7 in the circumferential direction. The lead 8 is connected to the coil 62 via the wiring board 7.

[0041] The first cover member 21 is made of resin. The first cover member 21 has a circular first end plate portion 211 and a circular ring-shaped first side plate portion 212 extending from an outer periphery of the first end plate portion 211 in the second direction X2. The first end plate portion 211 has a circular ring-shaped rib 213 protruding in the second direction X2 on an inner periphery side of the first side plate portion 212. The rib 213 is coaxial with the first side plate portion 212. A plurality of protrusions 214 protruding in the second direction X2 are provided at equal angle intervals on an end surface of the rib 213 in the second direction. In this example, three protrusions 214 are provided. A cover portion 66 protruding in the second direction X2 is provided at a part of the circumferential direction of the first side plate portion 212.

[0042] As shown in Figure 1 , the first cover member 21 is inserted into the cylindrical member 20 from the first direction XI side and is fixed to an end portion in the first direction XI of the cylindrical member 20. When the first cover member 21 is inserted into the cylindrical member 20 from the first direction XI side, the cover portion 66 is inserted into the notch portion 65 from the first direction XI side. A gap between an end edge in the second direction X2 of the cover portion 66 and the notch portion 65 when the cover portion 66 is inserted into the notch portion 65 is a wiring lead-out portion 60 for leading out the coil wire 63 of the coil 62 to the outside of the housing 5.

[0043] Here, a plurality of fixing portions 27 fixing the first cover member 21 and the cylindrical member 20 at a prescribed strength are provided in the circumferential direction therebetween. In this example, the fixing portions 27 are provided at three places at equal angle intervals. Details of each fixing portion 27 will be described later.

[0044] The second cover member 22 is made of resin. The second cover member 22 has a circular second end plate portion 221 and a circular ring-shaped second side plate portion 222 extending from an outer periphery of the second end plate portion 221 in the first direction XI. As shown in Figure 3 , Figure 4 , the second cover member 22 has a circular ring-shaped rib 223 in the second end plate portion 221. The rib 223 is coaxial with the second side plate portion 222 and protrudes in the first direction XI. Three protrusions 224 protruding in the first direction XI are provided at equal angle intervals on an end surface of the rib 223 in the second direction.

[0045] The second cover member 22 is inserted from the second direction X2 side of the tubular member 20 and is fixed to the end portion of the second direction X2 of the tubular member 20. Between the second cover member 22 and the tubular member 20, three fixing portions 27 that fix them with a prescribed strength are provided at equal angular intervals in the circumferential direction. Each fixing portion 27 has the same structure as the fixing portion 27 provided between the first cover member 21 and the tubular member 20.

[0046] (Coil holder)

[0047] As shown in FIG. 6, the coil holder 4 has a coil holding portion 40 that holds the coil 62 and a connection member holding portion 41 that holds the first outer frame member 51 of the first connection member 11 in the first direction Xl of the coil holding portion 40. As shown in FIG. 7, the coil 62 held in the coil holding portion 40 is positioned in the central portion of the axis direction X in the housing 5. Figure 2 Figure 3 Figure 4

[0048] The connection member holding portion 41 is ring-shaped. A first recessed portion 43 that is ring-shaped and is cut out from the first direction Xl and the inner peripheral side is provided on the inner peripheral surface of the connection member holding portion 41. A first step portion 44 is provided on the end portion of the second direction X2 of the first recessed portion 43. The first outer frame member 51 of the first connection member 11 is pressed into the first recessed portion 43 from the first direction Xl side. At the time of pressing in, the first step portion 44 comes into abutment with the first outer frame member 51 from the second direction X2 side, positioning the first outer frame member 51 in the axis direction X. Thus, the coil holder 4 holds the first outer frame member 51 of the first connection member 11 from the outer peripheral side and the second direction X2 side.

[0049] Figure 2 Figure 3 As shown in FIG. 8, two terminal pins 64 protrude from the outer peripheral surface of the connection member holding portion 41 to the outer peripheral side. The end portions of the coil wire 63 that are led out from the coil 62 are wound around the two terminal pins 64. When the coil holder 4 is fixed to the housing 5, the two terminal pins 64 protrude to the outside of the housing 5 via the wiring lead-out portion 60. Here, as shown in FIG. 9, the two terminal pins 64 that protrude to the outside of the housing 5 are electrically connected to the pads provided on the edge of the hole 71 provided on the wiring board 7. Thus, the coil wire 63 is electrically connected to the lead wire 8 for power supply. Figure 1 Figure 2 Figure 3

[0050] As shown in FIG. 8, two terminal pins 64 protrude from the outer peripheral surface of the connection member holding portion 41 to the outer peripheral side. The end portions of the coil wire 63 that are led out from the coil 62 are wound around the two terminal pins 64. When the coil holder 4 is fixed to the housing 5, the two terminal pins 64 protrude to the outside of the housing 5 via the wiring lead-out portion 60. Here, as shown in FIG. 9, the two terminal pins 64 that protrude to the outside of the housing 5 are electrically connected to the pads provided on the edge of the hole 71 provided on the wiring board 7. Thus, the coil wire 63 is electrically connected to the lead wire 8 for power supply. Figure 3 Figure 4 ​​​​​​​​​As shown, when the first cover member 21 is fixed to the tubular member 20, the protrusion 214 of the first cover member 21 abuts the first outer frame member 51 from the first direction X1. Specifically, the protrusion 214 of the first cover member 21 abuts the first outer frame member 51 from the first direction X1. When the first cover member 21 is fixed to the tubular member 20, the first cover member 21 prevents the first outer frame member 51 from moving in the first direction X1. Furthermore, the first cover member 21 prevents the viscoelastic body 10 of the first connecting member 11 from being exposed to the outside.

[0051] (Connecting member holding portion)

[0052] The connecting component retaining portion 25 is located in the second direction X2 of the coil holder 4. The connecting component retaining portion 25 is annular. An annular second recess 43 formed by cutting from the second direction X2 and the inner peripheral side is provided on the inner peripheral surface of the connecting component retaining portion 25. A second step portion 45 is provided at the end portion of the first direction X1 of the second recess 46. The second outer frame member 52 of the second connecting component 12 is pressed into the second recess 46 from the second direction X2 side. During the pressing, the second step portion 45 abuts against the second outer frame member 52 from the first direction X1 side, positioning the second outer frame member 52 in the axial direction X. Thus, the connecting component retaining portion 25 holds the second outer frame member 52 of the second connecting component 12 from the outer peripheral side and the first direction X1 side.

[0053] Here, when the second cover member 22 is fixed to the tubular member 20, the protrusion 214 of the second cover member 22 abuts the second outer frame member 52 from the second direction X2 side. In other words, the protrusion 214 of the second cover member 22 is a contact portion that abuts the second outer frame member 52 from the second direction X2 side. When the second cover member 22 is fixed to the tubular member 20, the second cover member 22 prevents the second outer frame member 52 from moving in the second direction X2. Furthermore, the second cover member 22 prevents the viscoelastic body 10 of the second connecting member 12 from being exposed to the outside.

[0054] (Movable body)

[0055] like Figures 2-4 As shown, the movable body 3 has a support shaft 30 extending in the axial direction X at the radial center of the support body 2. The support shaft 30 is a round metal rod. The axis of the support shaft 30 is the axis of the movable body 3 and coincides with the axis L of the housing 5. A magnet 61 is supported on the support shaft 30. The magnet 61 has an axial hole 610 at its center through which the support shaft 30 passes.

[0056] Furthermore, a yoke 35 is supported on the support shaft 30. The yoke 35 includes a first yoke 31 overlapping the magnet 61 in a first direction X1 of the axial direction X, and a second yoke 32 overlapping the magnet 61 in a second direction X2.

[0057] The first yoke 31 is a disc shape having a prescribed thickness. The first yoke 31 has a shaft hole 310 for the support shaft 30 to pass through in the center. The first yoke 31 is fixed to the face of the first direction X1 of the magnet 61 by adhesion or the like. Here, the outer diameter dimension of the first yoke 31 is larger than the outer diameter dimension of the magnet 61. Therefore, the outer peripheral surface of the first yoke 31 projects to the radial direction outside than the outer peripheral surface of the magnet 61.

[0058] The second yoke 32 is composed of two members, a first magnetic member 33 which is cup-shaped and a second magnetic member 34 which is a circular plate. The first magnetic member 33 has a circular end plate portion 331 having a shaft hole 330 for the support shaft 30 to pass through in the center, a curved portion 332 which curves from the outer edge of the end plate portion 331 to the first direction X1, and a cylindrical portion 333 which extends from the curved portion 332 to the first direction X1. The end plate portion 331 of the first magnetic member 33 is fixed to the end face of the second direction X2 of the magnet 61. The second magnetic member 34 has a shaft hole 340 for the support shaft 30 to pass through in the center. The second magnetic member 34 is fixed to the end plate portion 331 of the first magnetic member 33 from the side opposite to the magnet 61. As shown in FIG. 6, a plurality of through holes which pass through in the axial direction X are provided on the second magnetic member 34 on the outer peripheral side of the shaft hole 340. Each of the through holes is a weight adjustment portion 38 for adjusting the weight of the movable body 3. Figure 2

[0059] As shown in FIG. 6, the first inner frame member 36 of the first connecting member 11 is fixed to the support shaft 30 in the first direction X1 of the first yoke 31. More specifically, an annular protruding portion 361 which protrudes to the radial direction inside is provided on the inner peripheral surface of the first inner frame member 36 on the end portion of the second direction X2, and the support shaft 30 is pressed into the center hole of the annular protruding portion 361. Thus, the first inner frame member 36 is fixed to the support shaft 30. Figure 3 Figure 4 Further, the second inner frame member 37 of the second connecting member 12 is fixed to the support shaft 30 from the second direction X2 side of the second yoke 32. More specifically, an annular protruding portion 371 which protrudes to the radial direction inside is provided on the inner peripheral surface of the second inner frame member 37 on the end portion of the first direction X1, and the support shaft 30 is pressed into the center hole of the annular protruding portion 371. Thus, the second inner frame member 37 is fixed to the support shaft 30.

[0060] When the first inner frame member 36 and the second inner frame member 37 are fixed to the support shaft 30, the first inner frame member 36 abuts against the first yoke 31 from the first direction X1 side. Further, the second inner frame member 37 abuts against the second magnetic member 34 from the second direction X2 side. Therefore, the magnet 61 and the yoke 35 which are supported by the support shaft 30 are fixed to the support shaft 30 from both sides in the axial direction X by the first inner frame member 36 and the second inner frame member 37.

[0061] When the first inner frame member 36 and the second inner frame member 37 are fixed to the support shaft 30, the first inner frame member 36 abuts against the first yoke 31 from the first direction X1 side. Further, the second inner frame member 37 abuts against the second magnetic member 34 from the second direction X2 side. Therefore, the magnet 61 and the yoke 35 which are supported by the support shaft 30 are fixed to the support shaft 30 from both sides in the axial direction X by the first inner frame member 36 and the second inner frame member 37. ​​

[0062] When the magnet 61 and the yoke 35 are fixed to the support shaft 30, the magnet 61 and the yoke 35 are located in the central portion of the support shaft 30 in the axial direction X. In addition, the cylindrical portion 333 of the second yoke 32 is located radially outward of the outer peripheral surface of the magnet 61 and the first yoke 31 at a position that is apart from the outer peripheral surface of the magnet 61 and the first yoke 31 in the radial direction. Here, when the support body 2 and the movable body 3 are connected via the first connecting member 11 and the second connecting member, a portion of the coil 62 of the movable body 3 is located between the cylindrical portion 333 of the second yoke 32 and the outer peripheral surface of the magnet 61. In addition, a portion of the coil 62 of the movable body 3 is located between the cylindrical portion 333 of the second yoke 32 and the outer peripheral surface of the first yoke 31.

[0063] (Action of the actuator)

[0064] The actuator 1 causes the magnetic drive mechanism 6 to generate a driving force that drives the movable body 3 in the axial direction X by energizing the coil 62. When energization to the coil 62 is cut off, the movable body 3 returns to the home position under the restoring force of the viscoelastic body 10. Therefore, by intermittently performing energization to the coil 62, the movable body 3 vibrates in the axial direction X. In addition, it is possible to set such that by adjusting an alternating-current waveform applied to the coil 62, an acceleration with which the movable body 3 moves in the first direction XI of the axial direction X is different from an acceleration with which the movable body 3 moves in the second direction X2. Therefore, a person who holds a device in which the actuator 1 is installed as a haptic device is able to feel a vibration that has directionality in the axial direction X. In addition, it is also possible to configure a speaker using the actuator 1.

[0065] (Fixing portion)

[0066] Next, the fixing portion 27 of the fixing cylinder member 20 and the first cover member 21 will be described in detail. Figure 5 is an explanatory view of the fixing portion 27. In addition, the fixing portion 27 that fixes the second cover member 22 and the cylinder member 20 is the same as the fixing portion 27 that fixes the first cover member 21 and the cylinder member 20. Therefore, the fixing portion 27 that fixes the first cover member 21 and the cylinder member 20 will be described, and the description of the fixing portion 27 that fixes the second cover member 22 and the cylinder member 20 will be omitted.

[0067] As shown in Figure 1 , the first cover member 21 and the cylinder member 20 are provided with the fixing portion 27 at three positions in the circumferential direction around the axis L. The three fixing portions 27 are provided at equal angular intervals. Each fixing portion 27 has the same structure.

[0068] As shown in Figure 5As shown, each of the fixing portions 27 is provided with a first protrusion 81 protruding outward in the circumferential direction from a portion of the first side plate portion 212 of the first cover member 21, and a second protrusion 82 protruding outward in the second direction X2 from a portion of the circumferential direction of the first cover member 21. In addition, each of the fixing portions 27 is provided with a first recess 91 provided on the inner circumferential surface of the cylindrical member 20 and into which the first protrusion 81 is inserted, and a second recess 92 provided on the inner circumferential surface of the cylindrical member 20 and into which the second protrusion 82 is inserted. The first protrusion 81 is inserted into the first recess 91 from the first direction XI side. The second protrusion 82 is inserted into the second recess 92 from the first direction XI side.

[0069] The first protrusion 81 is provided with a pair of first end surfaces 81a at both ends in the circumferential direction. The second protrusion 82 is provided with a pair of second end surfaces 82a at both ends in the circumferential direction. A first protrusion width dimension D1 between the pair of first end surfaces 81a in the circumferential direction is larger than a second protrusion width dimension D2 between the pair of second end surfaces 82a in the circumferential direction. When viewed from the axial direction X, the first protrusion 81 overlaps the second protrusion 82, and the second protrusion 82 is located inward in the circumferential direction of the first protrusion 81. In this example, the second protrusion 82 is located at a central portion in the circumferential direction of the first protrusion 81. Each of the first end surfaces 81a of the first protrusion 81 and each of the second end surfaces 82a of the second protrusion 82 is located at a different position in the circumferential direction.

[0070] In addition, the first protrusion 81 protrudes more outward than the second protrusion 82. Therefore, a protrusion side step portion 83 provided with an end surface facing the second direction X2 is provided between the first protrusion 81 and the second protrusion 82.

[0071] Here, each of the first end surfaces 81a is a curved surface that is curved when viewed from the axial direction X. In this example, each of the first end surfaces 81a is curved in an S shape when viewed from the axial direction X.

[0072] The first recess 91 is provided with a pair of first side walls 91a facing each other in the circumferential direction on an inner wall surface thereof, and a first peripheral wall 91b of a circular arc extending in the circumferential direction between the pair of first side walls 91a. The first peripheral wall 91b faces the radially inner side of the cylindrical member 20. The second recess 92 is provided with a pair of second side walls 92a facing each other in the circumferential direction on an inner wall surface thereof, and a second peripheral wall 92b of a circular arc extending in the circumferential direction between the pair of first side walls 91a. The second peripheral wall 92b faces the radially inner side of the cylindrical member 20. When viewed from the axial direction X, the first recess 91 overlaps the second recess 92, and an end of the first direction XI of the second recess 92 communicates with a central portion in the circumferential direction of the first recess 91. Therefore, each of the first side walls 91a of the first recess 91 and each of the second side walls 92a of the second recess 92 is located at a different position in the circumferential direction.

[0073] Further, the first recess 91 is recessed deeper toward the outer circumferential side than the second protrusion 82. Therefore, the first peripheral wall 91b is located at a position further radially outward than the second peripheral wall 92b. Therefore, a groove side step portion 93 having an end surface toward the first direction Xl is provided between the first recess 91 and the second recess 92.

[0074] Here, each first side wall 91a is a transfer surface of a curved surface shape in which the first protrusion 81 is transferred. Therefore, each first side wall 91a is a curved surface having an S shape when viewed from the axis direction X.

[0075] In a state where the first cover member 21 is fixed to the cartridge member 20, each first end surface of the pair of first end surfaces 81a of the first protrusion 81 is in contact with each first side wall of the pair of first side walls 91a of the first recess 91, and the second end surface of the pair of second end surfaces 82a of the second protrusion 82 is in contact with each second side wall of the pair of second side walls 92a of the circumferentially opposed second recess 92. The first contact area Fl at which each first end surface 81a is in contact with each first side wall 91a is larger than the second contact area F2 at which each second end surface 82a is in contact with each second side wall 92a.

[0076] Here, in a state before the first protrusion 81 is inserted into the first recess 91, the first protrusion width dimension Dl of the first protrusion 81 is larger than the first recess width dimension El between the pair of first side walls 91a in the circumferential direction of the first recess 91. Further, the second protrusion width dimension D2 of the second protrusion 82 is larger than the second recess width dimension E2 between the pair of second side walls 92a in the circumferential direction of the second recess 92. A first press-in allowance obtained by subtracting the first recess width dimension El from the first protrusion width dimension Dl is equal to or less than a second press-in allowance obtained by subtracting the second recess width dimension E2 from the second protrusion width dimension D2. In the present example, the first press-in allowance is 0.05 mm to 0.1 mm. The second press-in allowance is 0.1 mm to 0.2 mm.

[0077] (EFFECTS)

[0078] In the present example, the first protrusion 81 and the second protrusion 82 are provided on the first cover member 21 so as to protrude toward the outer periphery, and the first recess 91 into which the first protrusion 81 is inserted and the second recess 92 into which the second protrusion 82 is inserted are provided on the inner peripheral surface of the barrel member 20. In addition, in a state before the first protrusion 81 is inserted into the first recess 91, the first protrusion width dimension Dl of the first protrusion 81 is larger than the first recess width dimension El of the first recess 91, and the second protrusion width dimension D2 of the second protrusion 82 is larger than the second recess width dimension E2 of the second recess 92. Therefore, when the first cover member 21 is inserted into the barrel member 20 to fix them, in each fixing portion 27, the first protrusion 81 is pressed into the first recess 91, and the second protrusion 82 is pressed into the second recess 92. Therefore, by the plurality of fixing portions 27, it is possible to have a strength with which the first cover member 21 does not easily fall off from the barrel member 20.

[0079] In addition, two pressing-in portions are provided on each fixing portion 27. Therefore, even in a case where the first protrusion 81 or the second protrusion 82 is broken due to an impact from the outside so that the pressing-in portions become one, it is possible to prevent the first cover member 21 from falling off from the barrel member 20.

[0080] Furthermore, the first contact area Fl at which the first end surface 81a of the first protrusion 81 contacts the first side wall 91a of the first recess 91 is larger than the second contact area F2 at which the second end surface 82a of the second protrusion 82 contacts the second side wall 92a of the second recess 92. Due to this, the frictional force between the first end surface 81a of the first protrusion 81 and the first side wall 91a of the first recess 91 becomes large, and thus it is more likely to prevent the first cover member 21 from falling off from the barrel member 20.

[0081] Here, in the actuator 1, when the vibration of the movable body 3 is transmitted to the first cover member 21 via the first connecting member 11, there is a problem that the first cover member 21 rotates around the axis L due to the vibration, and the first cover member 21 easily falls off from the barrel member 20. In view of this, in the present example, the first contact area Fl at which the first end surface 81a of the first protrusion 81 contacts the first side wall 91a of the first recess 91 is larger than the second contact area F2 at which the second end surface 82a of the second protrusion 82 contacts the second side wall 92a of the second recess 92. Therefore, by the contact of the first end surface 81a of the first protrusion 81 with the first side wall 91a of the first recess 91, it is possible to prevent the first cover member 21 from rotating with respect to the barrel member 20. Therefore, it is possible to prevent the first cover member 21 from easily falling off from the barrel member 20.

[0082] Further, in each of the fixing portions 27, when the first end surface 81a of the first protrusion 81 and the second end surface 82a of the second protrusion 82 overlap each other and the first side wall 91a of the first recessed portion 91 and the second side wall 92a of the second recessed portion 92 overlap each other as viewed in the axial direction X, the first end surface 81a of the first protrusion 81 and the second end surface 82a of the second protrusion 82 are aligned on a straight line in the axial direction X, and the first side wall 91a of the first recessed portion 91 and the second side wall 92a of the second recessed portion 92 are aligned on a straight line in the axial direction X. In this case, when a force in the axial direction X is applied to the first cover member 21, there is a problem that each of the first protrusion 81 and the second protrusion 82 easily falls out of the first recessed portion 91 and the second recessed portion 92 in the axial direction X. In this regard, in the present example, each of the first end surface 81a and the second end surface 82a is located at a different position in the circumferential direction, and each of the first side wall 91a and the second side wall 92a is located at a different position in the circumferential direction. Therefore, the first end surface 81a of the first protrusion 81 and the second end surface 82a of the second protrusion 82 are not aligned on a straight line in the axial direction X, and the first side wall 91a of the first recessed portion 91 and the second side wall 92a of the second recessed portion 92 are not aligned on a straight line in the axial direction X. Thus, it is easy to prevent the first cover member 21 from falling out of the tubular member 20.

[0083] Here, in the present example, the second protrusion 82 overlaps the first protrusion 81 as viewed in the axial direction X. Therefore, when the first cover member 21 is fixed to the tubular member 20, by pressing each of the fixing portions 27 in the second direction X2, it is possible to press the first protrusion 81 into the first recessed portion 91 and the second protrusion 82 into the second recessed portion 92. Further, as viewed from the first direction XI, the second protrusion 82 is in a state of being hidden by the first protrusion 81. Therefore, when the first cover member 21 is fixed to the tubular member 20 as viewed from the first direction XI, it is possible to hide the second protrusion 82 and the second recessed portion 92 into which the second protrusion 82 is inserted, by the first protrusion 81.

[0084] Further, the first protrusion 81 protrudes further outward in the circumferential direction than the second protrusion 82, and the first recessed portion 91 is recessed further deeply in the outward direction in the circumferential direction than the second recessed portion 92. Therefore, it is possible to make the first contact area Fl at which the first end surface 81a of the first protrusion 81 in the circumferential direction comes into contact with the first side wall 91a of the first recessed portion 91 larger than the second contact area F2 at which the second end surface 82a of the second protrusion 82 in the circumferential direction comes into contact with the second side wall 92a of the second recessed portion 92. Thus, the frictional force between the first end surface 81a of the first protrusion 81 and the first side wall 91a of the first recessed portion 91 becomes large, and thus it is easier to prevent the first cover member 21 from falling out of the tubular member 20. Further, since the first contact area Fl of the first end surface 81a of the first protrusion 81 and the first side wall 91a of the first recessed portion 91 becomes large, when the vibration of the movable body 3 is transmitted to the first cover member 21, it is possible to prevent the first cover member 21 from rotating with respect to the tubular member 20.

[0085] Further, in the present example, since the first protrusions 81 protrude more outwardly than the second protrusions 82, a protrusion-side step portion 83 having an end surface facing the second direction X2 is formed between the first protrusions 81 and the second protrusions 82. On the other hand, since the first recesses 91 are recessed more deeply outwardly than the second recesses 92, a groove-side step portion 93 having an end surface facing the first direction X1 is formed between the first recesses 91 and the second recesses 92. Thus, when the fixing portions 27 are pressed into the second direction X2 in order to fix the first cover member 21 to the barrel member 20, the protrusion-side step portion 83 and the groove-side step portion 93 abut in the axial direction X. Thus, when the first cover member 21 is fixed to the barrel member 20, the first cover member 21 can be positioned in the axial direction X.

[0086] Further, in the present example, each of the first end surfaces 81a is a curved surface that is curved when viewed from the axial direction X, and each of the first side walls 91a is a transfer surface that transfers the shape of the curved surface. Thus, the first contact area Fl at which the first end surface 81a of the first protrusion 81 contacts the first side wall 91a of the first recess 91 can be larger than the second contact area F2 at which the second end surface 82a of the second protrusion 82 contacts the second side wall 92a of the second recess 92. Thus, the frictional force between the first end surface 81a of the first protrusion 81 and the first side wall 91a of the first recess 91 becomes large, and thus the first cover member 21 is more likely to be prevented from falling off the barrel member 20. Further, since the first contact area Fl of the first end surface 81a of the first protrusion 81 and the first side wall 91a of the first recess 91 is large, when vibration of the movable body 3 is transmitted to the first cover member 21, the first cover member 21 can be prevented from rotating relative to the barrel member 20.

[0087] Further, in the present example, the first press-in allowance, which is obtained by subtracting the first recess width dimension E1 from the first protrusion width dimension D1, is equal to or less than the second press-in allowance, which is obtained by subtracting the second recess width dimension E2 from the second protrusion width dimension D2. Thus, by pressing the second protrusion 82 into the second recess 92 away from the opening end of the barrel member 20, a strength that is larger than that between the first protrusion 81 and the first recess 91 can be ensured between the second protrusion 82 and the second recess 92. Thus, the first cover member 21 is less likely to fall off the barrel member 20. Further, since the first press-in allowance is equal to or less than the second press-in allowance, when the first protrusion 81 is pressed into the first recess 91 provided on the side of the barrel member 20 close to the opening end, the opening end of the barrel member 20 can be prevented or inhibited from being deformed.

[0088] Here, in the present example, the fixing portions 27 are provided at three equal angular intervals. Thus, by the plurality of fixing portions 27, a strength at which the first cover member 21 is unlikely to fall off the barrel member 20 can be easily ensured.

[0089] Further, in this example, the actuator 1 is provided with the coil holder 4 fixed to the inside of the case 5. The first connecting member 11 is provided with: the annular viscoelastic body 10 arranged coaxially with the case 5; the first inner frame member 36 fixed to the end surface of the inner peripheral side of the viscoelastic body 10; and the first outer frame member 51 fixed to the end surface of the outer peripheral side of the viscoelastic body 10. The coil holder 4 holds the first outer frame member 51 from the radially outer side and the second direction X2 side. The first inner frame member 36 is connected to the movable body 3. The first abutting portion 28 provided to the first cover member 21 abuts against the first outer frame member 51 from the first direction XI side. Thus, by the first cover member 21 and the coil holder 4 constituting the support body 2, the first outer frame member 51 can be held so as not to move in the axial direction X. Further, by the first cover member 21, the viscoelastic body 10 can be prevented from protruding to the outside of the case 5.

[0090] Further, in a case where the tubular member 20 and the first cover member 21 are made of resin, the hardness of the tubular member 20 is preferably equal to or higher than the hardness of the first cover member 21. In this way, when the first protrusion 81 and the second protrusion 82 of the first cover member 21 are inserted into the first recess 91 and the second recess 92 of the tubular member 20, the outer diameter dimension of the tubular member 20 can be prevented or suppressed from changing.

[0091] (Variants)

[0092] The first protrusion 81 and the second protrusion 82 provided on the second direction X2 of the first protrusion 81 can also be formed at different positions in the circumferential direction. In this case, the first recess 91 and the second recess 92 are provided at different positions in the circumferential direction. Further, the second recess 92 extends from the opening end of the tubular member 20 in the axial direction X.

[0093] Further, the pair of first end surfaces 81a of the first protrusion 81 can also be flat surfaces. Also, the fixing portion 27 can be provided at two places in the circumferential direction, or at four or more places.

Claims

1. An actuator, characterized in that: have: a housing including a cylindrical member and a cover member that is inserted into the cylindrical member and closes one axial opening of the cylindrical member; a movable body accommodated in the housing; a connecting member connecting the movable body and the housing so as to be movable relative to each other in the axial direction; as well as a magnetic drive mechanism that causes the movable body to vibrate in the axial direction relative to the housing, The housing includes a plurality of fixing portions for fixing the cover member to the cylinder member. When one of the axial directions is defined as a first direction and the other as a second direction, the cover member includes a contact portion that contacts the connecting member from the first direction side. Each fixing portion includes: a first protrusion protruding from a portion of the circumference of the cover member toward the outer circumference; a second protrusion protruding from a portion of the circumferential direction of the cover member toward the outer circumference in the second direction of the first protrusion; and a first recess provided on the inner circumferential surface of the cylinder member and into which the first protrusion is inserted; and a second recess provided on the inner circumferential surface of the cylinder member and into which the second protrusion is inserted, The first end surfaces of the first protrusion, which are located at both ends in the circumferential direction, are in contact with the first side walls of the first recess, which are opposite to each other in the circumferential direction. The second end surfaces of the second protrusion, which are located at both ends in the circumferential direction, are in contact with the second side walls of the second recess, which are opposite to each other in the circumferential direction. A first contact area between each first end surface and each first side wall is larger than a second contact area between each second end surface and each second side wall. In the state before the first protrusion is inserted into the first recess, the first protrusion width dimension between the pair of first end faces in the circumferential direction is larger than the first recess width dimension between the pair of first side walls in the circumferential direction, and the second protrusion width dimension between the pair of second end faces in the circumferential direction is larger than the second recess width dimension between the pair of second side walls in the circumferential direction.

2. The actuator according to claim 1, characterized in that Each first end face and each second end face is located at different positions in the circumferential direction, The first side walls and the second side walls are located at different positions in the circumferential direction.

3. The actuator according to claim 2, characterized in that The first protrusion width dimension is longer than the second protrusion width dimension, The first recess width is longer than the second recess width. When viewed from the axial direction, the second protrusion is located on the inner side of the first protrusion in the circumferential direction. The second recess is located in the second direction of the first recess and is connected to the first recess in the axial direction.

4. The actuator according to any one of claims 1 to 3, characterized in that A first press-fitting allowance obtained by subtracting the first recess width dimension from the first protrusion width dimension is equal to or smaller than a second press-fitting allowance obtained by subtracting the second recess width dimension from the second protrusion width dimension.

5. The actuator according to any one of claims 1 to 3, characterized in that The first protrusion protrudes toward the outer periphery than the second protrusion. The first recessed portion is recessed deeper toward the outer peripheral side than the second recessed portion.

6. The actuator according to any one of claims 1 to 3, characterized in that Each first end surface is a curved surface when viewed from the axial direction, Each first side wall is a transfer surface to which the shape of the curved surface is transferred.

7. The actuator according to any one of claims 1 to 3, characterized in that Three or more fixing portions are provided at equal angular intervals.

8. The actuator according to any one of claims 1 to 3, characterized in that The actuator includes a holder fixed inside the housing. The connecting member comprises: an annular viscoelastic body extending in the radial direction; an inner frame member fixed to the end surface of the inner peripheral side of the viscoelastic body; and an outer frame member fixed to the end surface of the outer peripheral side of the viscoelastic body. The holder holds the outer frame member from the outer peripheral side and the second direction side. The inner frame member is connected to the movable body. The abutting portion abuts against the outer frame member.

Images