Damper member and actuator, and method of manufacturing damper member

Abstract

To secure adhesion between a release film and the bottom surface of a frame member used as a mold when manufacturing viscoelastic members such as gel-like members by using, as the mold, at least one of a cylindrical inner frame member and a cylindrical outer frame member.SOLUTION: An actuator according to the present invention includes: a damper member; a cylindrical connector; and an outer frame member 13 joined to an outer peripheral surface of the connector. The connector is a viscoelastic member such as a gel-like member. A component bottom surface 130 of the outer frame member 13 includes: an inner peripheral portion 131; an outer peripheral portion 132; and a step portion connecting the inner peripheral portion 131 and the outer peripheral portion 132. A burr 134 is formed on the component bottom surface 130 protruding toward one side in a component axial direction. The burr 134 is formed on the outer peripheral portion 132 that is recessed toward the other side in the component axial direction with respect to the inner peripheral portion 131.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a damper member, an actuator, and a method for manufacturing a damper member. [Background technology]

[0002] Patent Document 1 describes an actuator including a connector connected to a movable body and a support, and a magnetic drive mechanism that moves the movable body relative to the support. In the actuator of Patent Document 1, the support includes a cylindrical case, cover members that close both ends of the case, and a coil holder arranged inside the case. The movable body includes a support shaft arranged at the radial center of the case, and a yoke and magnet fixed to the support shaft. The magnetic drive mechanism includes a magnet and a coil wound around a coil holder arranged on the outer periphery of the magnet.

[0003] In Patent Document 1, a cylindrical viscoelastic member is used as the connector. The cylindrical viscoelastic member is manufactured by a method (casting) in which a gel material is injected between an annular inner frame member and an outer frame member and then hardened. This results in a damper member in which the inner frame member is bonded to the inner peripheral surface of the viscoelastic member and the outer frame member is bonded to the outer peripheral surface of the viscoelastic member. By making such a damper member into a component in advance, there is no need to handle the viscoelastic member, such as a gel-like member, separately when assembling the actuator, which improves ease of assembly.

[0004] In Patent Document 1, when assembling the support body and the movable body, an inner frame member is fixed to the end of the support shaft, and an outer frame member is fixed to the inside of the case or coil holder. This connects the movable body and the support body via the damper member. In Patent Document 1, damper members are arranged at two locations on both ends of the support shaft, and the movable body is supported at two locations on both ends of the support shaft. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-32149 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, when a viscoelastic material such as a gel material is manufactured by casting, an inner frame member and an outer frame member are positioned relative to a manufacturing jig. At this time, cushioning material and a release film are placed on the bottom surface of the manufacturing jig, and then the inner frame member and the outer frame member are placed on the release film. Then, a gel material is poured onto the release film. This prevents the viscoelastic material from directly adhering to the manufacturing jig, allowing for easy release.

[0007] However, when manufacturing inner and outer frame members, burrs can form on the parting surfaces of the mold used to manufacture the parts. If burrs form on the bottom surface of the part that comes into contact with the release film, the release film and the bottom surface of the part will not adhere tightly to each other, resulting in a gap. In this case, the gel material will enter the gap between the release film and the bottom surface of the part, causing gel leakage. Alternatively, air will enter the gel through the gap between the release film and the bottom surface of the part, creating bubbles inside the gel material.

[0008] In view of the above problems, an object of the present invention is to ensure adhesion between the bottom surface of the part used as a mold and a release film when at least one of a cylindrical inner frame member and an outer frame member is used as a mold to manufacture a viscoelastic member such as a gel-like member by casting. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, one aspect of the damper member of the present invention is a damper member having a cylindrical viscoelastic member and a cylindrical part joined to the outer or inner peripheral surface of the viscoelastic member, wherein the cylindrical part has a bottom surface facing one side in a part axial direction along the central axis of the cylindrical part, the bottom surface having an inner peripheral portion extending from the inner peripheral edge of the bottom surface to the outer peripheral side, an outer peripheral portion that is positioned at a different position in the part axial direction from the inner peripheral portion and that extends from the outer peripheral edge of the bottom surface to the inner peripheral side, and a step portion connecting the inner peripheral portion and the outer peripheral portion, wherein a burr is formed on the bottom surface protruding to one side in the part axial direction, and the burr is located on a portion of the inner peripheral portion or the outer peripheral portion that is located on the other side in the part axial direction, or on the step portion.

[0010] One aspect of the actuator of the present invention comprises the above-mentioned damper member, a movable body having a support shaft extending in an axial direction that coincides with the axial direction of the component, a support body having a case surrounding the outer periphery of the support shaft and supporting the movable body via the damper member, and a magnetic drive mechanism that moves the movable body in the axial direction relative to the support body, wherein the damper member is characterized in that the viscoelastic member is arranged to surround the support shaft and is connected to the support shaft or the case via the tubular component, and when the movable body moves in the axial direction, the viscoelastic member undergoes shear deformation in the axial direction.

[0011] Next, one aspect of the method for manufacturing a damper member according to the present invention is characterized in that a cushioning material is placed on the bottom surface of a manufacturing jig, a release film is laminated on top of the cushioning material, and when the tubular part is positioned on the manufacturing jig, the bottom surface of the part presses the cushioning material via the release film, a gel material is filled on the inner or outer side of the tubular part, and the gel material is hardened to form the viscoelastic member and connect the viscoelastic member to the tubular part, and the viscoelastic member is removed from the manufacturing jig together with the tubular part.

[0012] Another aspect of the method for manufacturing a damper member according to the present invention is characterized in that a cushioning material is placed on the bottom surface of a manufacturing jig and a release film is laminated on top of the cushioning material; when the outer frame member and the inner frame member are positioned in the manufacturing jig, the outer frame member and the inner frame member are pressed toward the bottom surface to adhere the inner frame member to the cushioning material via the release film and to adhere at least the inner peripheral portion of the outer frame member to the cushioning material via the release film; a gel material is filled into the gap between the inner frame member and the outer frame member; and the gel material is hardened to mold the viscoelastic member and connect the viscoelastic member to the inner frame member and the outer frame member; and the viscoelastic member is removed from the manufacturing jig together with the inner frame member and the outer frame member. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of the actuator of the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the actuator shown in FIG. 1 (a cross-sectional view taken along line AA in FIG. 1). [Figure 3] FIG. 3 is an explanatory diagram of a manufacturing method of the damper member of the first embodiment. [Figure 4] FIG. 4 is a plan view and a cross-sectional view of the outer frame member of the first embodiment. [Figure 5] FIG. 5 is an explanatory diagram of a method for manufacturing the outer frame member shown in FIG. [Figure 6] FIG. 6 is an explanatory view showing a state in which the release film is pressed by the outer frame member shown in FIG. [Figure 7] FIG. 7 is an explanatory diagram of an outer frame member of a comparative example. [Figure 8] FIG. 8 is an explanatory diagram of an outer frame member according to the second embodiment. [Figure 9] FIG. 9 is an explanatory diagram of an outer frame member according to the third embodiment. [Figure 10] FIG. 10 is an explanatory diagram of an outer frame member according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the damper member 100 and the actuator 1 will be described with reference to the drawings.

[0015] (Overall composition) Fig. 1 is a perspective view of an actuator 1 of embodiment 1. Fig. 2 is a cross-sectional view of the actuator 1 shown in Fig. 1, taken along line AA in Fig. 1. As shown in Fig. 2, the actuator 1 includes a support 2, a movable body 3, a connecting body 10 connected to the support 2 and the movable body 3, and a magnetic drive mechanism 6.

[0016] In the following description, the direction in which the central axis L of the support shaft 30 disposed at the radial center of the movable body 3 extends is referred to as the axial direction, with one side of the axial direction being referred to as L1 and the other side of the axial direction being referred to as L2. The movable body 3 vibrates in the axial direction relative to the support body 2.

[0017] The magnetic drive mechanism 6 includes a magnet 61 arranged on the movable body 3 and a coil 62 arranged on the support body 2. The magnetic drive mechanism 6 may have a configuration in which the arrangement of the magnet 61 and the coil 62 is reversed. That is, the magnetic drive mechanism 6 may have a configuration in which the coil 62 is arranged on the movable body 3 and the magnet 61 is arranged on the support body 2.

[0018] The connecting body 10 has at least one of elasticity and viscoelasticity. As shown in Fig. 2, the movable body 3 is connected to the support body 2 via the connecting body 10 at each of an end portion on one axial side L1 and an end portion on the other axial side L2.

[0019] In the actuator 1, when current is applied to the coil 62, the magnetic drive mechanism 6 generates a driving force that drives the movable body 3 in the axial direction. By intermittently applying current to the coil 62, the movable body 3 vibrates in the axial direction. At this time, the connecting body 10 undergoes shear deformation. The connecting body 10 constitutes a damper member 100.

[0020] (Support) 1 and 2, the support body 2 includes a cylindrical case 20 that houses the movable body 3. The case 20 includes a cylindrical case body 24, a first cover member 21 that closes an end of the case body 24 on one side L1 in the axial direction, a second cover member 22 that closes an end of the case body 24 on the other side L2 in the axial direction, and a coil holder 4 that is disposed inside the case body 24.

[0021] As shown in Fig. 2, the coil holder 4 includes an annular first outer frame member fixing portion 41 and a body portion 42 that protrudes from the first outer frame member fixing portion 41 to the other side L2 in the axial direction. The first outer frame member fixing portion 41 is press-fitted into the case body 24, thereby fixing the coil holder 4 to the case body 24. A first outer frame member 51 is press-fitted inside the first outer frame member fixing portion 41. The case body 24 includes a second outer frame member fixing portion 25 that protrudes inward at a position on the other side L2 in the axial direction relative to the coil holder 4. A second outer frame member 52 is press-fitted inside the second outer frame member fixing portion 25.

[0022] The coil 62 of the magnetic drive mechanism 6 is disposed around the body 42 of the coil holder 4. The coil 62 is connected to two terminal pins 64 that protrude radially outward from the first outer frame member fixing portion 41. As shown in FIG. 1 , the case body 24 has a notch 65 formed by cutting out an end portion on one side L1 in the axial direction. A wiring board 7 is fixed to a board fixing portion 69 provided on the other side L2 in the axial direction of the notch 65. The terminal pins 64 protrude from the notch 65 to the outside of the case body 24 and are connected to the wiring board 7.

[0023] As shown in FIGS. 1 and 2, the first cover member 21 and the second cover member 22 each include a circular cover portion 26 when viewed in the axial direction, and a plurality of locking portions 27 provided on the outer periphery of the cover portion 26. The locking portion 27 is a claw portion that elastically deforms in the radial direction and is pushed into the inner periphery of the case body 24 together with the lid portion 26. The tip of the locking portion 27 is locked to a restricting portion 28 that protrudes from the edge of the case body 24 toward the inner periphery. The first lid member 21 is provided with a cover 66 that extends from the outer periphery of the lid portion 26 toward the other axial side L2 and fits into a notch 65 of the case body 24.

[0024] (movable body) The movable body 3 includes a support shaft 30 extending in the axial direction, a magnet 61 and a yoke 35 fixed to the support shaft 30, and a first inner frame member 36 and a second inner frame member 37. The support shaft 30, the first inner frame member 36, and the second inner frame member 37 are made of metal. The support shaft 30 passes through the magnet 61 and the yoke 35. The first inner frame member 36 and the second inner frame member 37 are cylindrical. An end portion of one axial side L1 of the support shaft 30 is press-fitted into the central hole of the first inner frame member 36. An end portion of the other axial side L2 of the support shaft 30 is press-fitted into the central hole of the second inner frame member 37. The magnet 61 and the yoke 35 are held in the axial center of the support shaft 30 by the first inner frame member 36 and the second inner frame member 37.

[0025] The magnet 61 is disk-shaped. The yoke 35 includes a first yoke 31 that abuts against the magnet 61 from one axial side L1, and a second yoke 32 that abuts against the magnet 61 from the other axial side L2. The second yoke 32 includes a cup-shaped first magnetic member 33 and a disk-shaped second magnetic member 34. The first magnetic member 33 includes a disk portion that abuts against the magnet 61 from the other axial side L2, and a cylindrical portion that extends from the outer edge of the disk portion toward the one axial side L1. The second magnetic member 34 abuts against the disk portion of the first magnetic member 33 from the other axial side L2. As shown in FIG. 2, the coil 62 wound around the body portion 42 of the coil holder 4 is disposed between the cylindrical portion of the second yoke 32 and the outer circumferential surface of the magnet 61.

[0026] The movable body 3 may be provided with a weight member for adjusting its weight. For example, the number of magnetic members constituting the yoke 35 may be increased so that the magnetic members also serve as weight members. Alternatively, the first inner frame member 36 and the second inner frame member 37 may be provided with the function of weight members.

[0027] (connector) The movable body 3 is connected to the support body 2 at two locations spaced apart in the axial direction via connecting bodies 10. As shown in FIG. 2, the connecting bodies 10 include a cylindrical first connecting body 11 joined to the inner circumferential surface of the first outer frame member 51 and the outer circumferential surface of the first inner frame member 36, and a cylindrical second connecting body 12 joined to the inner circumferential surface of the second outer frame member 52 and the outer circumferential surface of the second inner frame member 37. When the movable body 3 vibrates in the axial direction, the first connecting body 11 and the second connecting body 12 undergo shear deformation.

[0028] The connector 10 is made of a viscoelastic material. For example, various rubber materials such as gel-like materials made of silicone gel, natural rubber, diene rubber (e.g., styrene-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, etc.), non-diene rubber (e.g., butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, urethane rubber, silicone rubber, fluororubber, etc.), thermoplastic elastomer, and modified materials thereof can be used as the connector 10.

[0029] The connecting body 10 is a gel-like member made of silicone gel with a penetration of 90 to 110 degrees. The connecting body 10 is manufactured by a method of filling a mold with a viscoelastic material such as a gel material and hardening it (i.e., casting). At this time, two cylindrical parts used as molds are bonded to the inner and outer peripheral surfaces of the connecting body 10. In this way, the damper member 100 is manufactured, with cylindrical parts bonded to the inner and outer peripheral surfaces of the connecting body 10. By manufacturing the damper member 100, it is not necessary to handle the connecting body 10, which is a gel-like member, separately, making it easy to handle the parts. Furthermore, when assembling the actuator 1, the gel-like member is bonded to the connecting body 10. The support body 2 and the movable body 3 can be connected without performing the step of bonding the support body 2 and the movable body 3 together.

[0030] When manufacturing the first connecting body 11, the two cylindrical parts used as a mold are the first outer frame member 51 and the first inner frame member 36. When assembling the actuator 1, the end of one axial side L1 of the support shaft 30 is press-fitted into and fixed to the first inner frame member 36, and the first outer frame member 51 is press-fitted into and fixed to the coil holder 4. This connects the end of one axial side L1 of the movable body 3 to the support body 2 via the damper member 100.

[0031] Similarly, when manufacturing the second connecting body 12, the two cylindrical parts used as a mold are the second outer frame member 52 and the second inner frame member 37. When assembling the actuator 1, the end of the other axial side L2 of the support shaft 30 is press-fitted into and fixed to the second inner frame member 37, and the second outer frame member 52 is press-fitted into and fixed to the second outer frame member fixing portion 25 of the case 20. This connects the end of the other axial side L2 of the movable body 3 to the support body 2 via the damper member 100.

[0032] (Manufacturing method of damper member) 3 is an explanatory diagram of a manufacturing method of the damper member 100 of embodiment 1. In the following description, of the two tubular parts used as a mold, the tubular part on the outer periphery that will become the first outer frame member 51 or the second outer frame member 52 will be called the outer frame member 13. Similarly, of the two tubular parts used as a mold, the tubular part on the inner periphery that will become the first inner frame member 36 or the second inner frame member 37 will be called the inner frame member 14.

[0033] 3, the manufacturing method of this embodiment uses a manufacturing jig 90A and a pressing jig 90B. The manufacturing jig 90A has a flat bottom surface 91. The pressing jig 90B has an opposing surface 94 that faces the bottom surface 91 of the manufacturing jig 90A, a pin 95 that protrudes from the center of the opposing surface 94, and an inner peripheral surface 96 that surrounds the outer periphery of the pin 95. The inner peripheral surface 96 is provided with a recess 97 that accommodates the outer frame member 13.

[0034] As shown in Fig. 3, in the first step, cushion material 92 is placed on the bottom surface 91 of manufacturing jig 90A, and a release film 93 is placed on the surface of cushion material 92. Cushion material 92 is a foamed resin such as silicone sponge. In this embodiment, a heat-resistant foamed resin is used as cushion material 92 because the manufacturing jig 90A is heated together to thermally harden gel material G. Release film 93 is, for example, a film made of PET (polyethylene terephthalate) resin and coated with a fluororesin or silicone resin.

[0035] Subsequently, in the second step, the outer frame member 13 and the inner frame member 14 are positioned on the pressing jig 90B. For example, as shown in Fig. 4(b), the pressing jig 90B is turned over, and the pins 95 protruding from the opposing surface 94 are inserted into the inner frame member 14, and the inner frame member 14 is brought into contact with the opposing surface 94. In addition, the outer frame member 13 is positioned in the recesses 97 provided in the inner peripheral surface 96.

[0036] Next, in the third step, pressing jig 90B is inverted, and outer frame member 13 and inner frame member 14 are placed between pressing jig 90B and bottom surface 91 of manufacturing jig 90A. Because cushioning material 92 and release film 93 are placed on bottom surface 91 of manufacturing jig 90A, cushioning material 92 and release film 93 are sandwiched between outer frame member 13 and inner frame member 14 and bottom surface 91.

[0037] In the fourth step, pressing jig 90B is pressed toward bottom surface 91 of manufacturing jig 90A. For example, as shown in FIG. 3 , pressing jig 90B is pressed using a pressing mechanism 98 such as a clamp. As a result, cushioning material 92 is crushed by the pressing force, and release film 93 adheres tightly to the end surfaces of outer frame member 13 and inner frame member 14.

[0038] Here, we will explain the shape of the cushioning material when pressed by the outer frame member 13 and the inner frame member 14. In the drawings showing the third and fourth steps in Fig. 3, the outer frame member 13 and the inner frame member 14 are assembled to the pressing mechanism 98 so that the central axes of the respective members are aligned. In the following explanation, the direction along the central axis LA of the outer frame member 13 and the inner frame member 14 is referred to as the component axial direction, with one side of the component axial direction referred to as LA1 and the other side of the component axial direction referred to as LA2.

[0039] In the fourth step, the pressing force of the pressing mechanism 98 presses the cushion material 92, via the release film 93, against the end faces of one side LA1 in the component axis direction of the outer frame member 13 and the inner frame member 14. As a result, the cushion material 92 bulges toward the other side LA2 in the component axis direction in the gap S between the outer frame member 13 and the inner frame member 14. For ease of explanation, in FIG. 3, the shape of the cushion material 92 in the gap S is depicted as bulging out more than it actually is.

[0040] In the fifth step, gel material G is filled into the annular gap S formed between the outer frame member 13 and the inner frame member 14. For example, the gel material G is filled from a dispenser 99. Before the gel material G is poured into the gap S, an adhesion aid such as a primer (not shown) is applied to the outer peripheral surface of the inner frame member 14 and the inner peripheral surface of the outer frame member 13. The primer (adhesion aid) may be applied before or after the outer frame member 13 and the inner frame member 14 are positioned in the pressing jig 90B.

[0041] In the sixth step, the gel material G is heated together with the manufacturing jig 90A and the pressing jig 90B and hardened by maintaining the temperature at a specified temperature for a specified time. As a result, a connecting body 10, which is a gel-like material, is formed in the gap S. When the gel material G is heated and hardened, the portion that comes into contact with the primer reacts with the primer and is fixed to the outer peripheral surface of the inner frame member 14 and the inner peripheral surface of the outer frame member 13. Therefore, the connecting body 10 is fixed to the outer frame member 13 and the inner frame member 14 by the adhesive strength of the connecting body 10 itself.

[0042] In the seventh step, the completed connecting body 10 is removed from the manufacturing jig 90A and the pressing jig 90B together with the outer frame member 13 and the inner frame member 14. For example, through holes (not shown) for arranging ejector pins are formed in the bottom surface 91 of the manufacturing jig 90A and the opposing surface 94 of the pressing jig 90B, and the ejector pins are used to remove the connecting body 10 together with the outer frame member 13 and the inner frame member 14 from the manufacturing jig 90A and the pressing jig 90B. During demolding, the release film 93 is peeled off and removed from the connecting body 10. This yields the damper member 100.

[0043] In the completed damper member 100, the end face 111 of one side LA1 in the component axis direction of the connecting body 10 has an inverted shape of the cushioning material 92 that bulges on the other side LA2 in the component axis direction. Therefore, the end face 111 of the connecting body 10 is concave. Furthermore, the end face 112 of the other side LA2 in the component axis direction of the connecting body 10 is concave because the gel material G is depressed by surface tension during molding. Note that in FIG. 3, the shapes of the end faces 111, 112 of the connecting body 10 are depicted as being more concave than they actually are, for ease of explanation.

[0044] (Outer frame components) FIG. 4 shows a plan view and a cross-sectional view of the outer frame member 13 of the first embodiment. The outer frame member 13 is a cylindrical component extending in the component axial direction around the central axis LA. The outer frame member 13 has an annular component bottom surface 130 facing one side LA1 in the component axial direction. The component bottom surface 130 has an inner peripheral portion 131, an outer peripheral portion 132, and a step portion 133. As shown in the partially enlarged view of FIG. 4, the component bottom surface 130 has a burr protruding from the outer peripheral portion 132 toward one side LA1 in the component axial direction. 134 has been made.

[0045] The inner peripheral portion 131 is an annular surface that spreads outward from the inner peripheral edge of the component bottom surface 130. The outer peripheral portion 132 is an annular surface that spreads outward from the outer peripheral edge of the component bottom surface 130. Both the inner peripheral portion 131 and the outer peripheral portion 132 are flat surfaces that are perpendicular to the component axial direction. The connecting body 10 is disposed on the inner peripheral side of the outer frame member 13. Therefore, it is sufficient that the inner peripheral portion 131, which is disposed on the side where the gel material G is filled during manufacturing of the connecting body 10, is a surface that is perpendicular to the component axial direction, and the outer peripheral portion 132 does not have to be a flat surface that is perpendicular to the component axial direction.

[0046] The inner peripheral portion 131 and the outer peripheral portion 132 are located at different positions in the component axial direction. In the embodiment shown in Fig. 4, the outer peripheral portion 132 is recessed toward the other side LA2 in the component axial direction relative to the inner peripheral portion 131. The step portion 133 is a cylindrical surface extending in the component axial direction from the outer peripheral edge of the inner peripheral portion 131 to the inner peripheral edge of the outer peripheral portion 132.

[0047] FIG. 5 is an explanatory diagram of a manufacturing method for the outer frame member 13 shown in FIG. 4. The outer frame member 13 is manufactured by filling a mold 80 with molten material and hardening it. As shown in FIG. 5, the mold 80 is structured to be divided radially at the position of the component bottom surface 130 of the outer frame member 13. A dividing surface 81 of the mold 80 is located on the outer periphery side of a step portion 133. Therefore, as shown in the lower diagram of FIG. 5, a burr 134 is formed on the outer periphery portion 132 of the component bottom surface 130 along the dividing surface 81 of the mold 80, protruding to one side LA1 in the component axial direction. The burr 134 is a mark left by the dividing surface 81 of the mold 80.

[0048] 4 and 5, the height of the step portion 133 in the component axial direction and the height of the burr 134 are exaggerated to make the explanation easier to understand. The actual dimensions of the outer frame member 13 are, for example, an inner diameter of 14 mm and an outer diameter of 16.3 mm. As shown in the partially enlarged view of FIG. 5, the dimensions of the component bottom surface 130 are, for example, a radial width D1 of the inner peripheral portion 131 of 0.25 mm and a radial width D2 of the outer peripheral portion 132 of 0.8 mm. The position of the parting line where the burr 134 is formed is a position where the radial distance D3 from the step portion 133 is 0.15 mm.

[0049] The step portion 133 has a height H of 0.05 mm in the component axial direction, for example. The height of the step portion 133 is set in consideration of the height of burrs 134 formed along the parting line. It is preferable that the height of the step portion 133 is H≧0.05 mm.

[0050] Fig. 6 is an explanatory diagram showing a state in which the release film 93 is pressed by the outer frame member 13 shown in Fig. 4. When manufacturing the connecting body 10 by casting, a gap S for filling the gel material G is formed between the outer frame member 13 and the inner frame member 14, as shown in the upper diagram of Fig. 6. At this time, the component bottom surface 130 of the outer frame member 13 is pressed against the cushion material 92 via the release film 93.

[0051] The outer frame member 13 has a step 133 on the component bottom surface 130, and the inner peripheral portion 131 protrudes more than the outer peripheral portion 132. Because the inner peripheral portion 131 is a flat surface perpendicular to the component axial direction, the entire surface of the inner peripheral portion 131 adheres to the release film 93. A burr 134 is formed along the parting line on the component bottom surface 130, but the burr 134 protrudes from the outer peripheral portion 132, which is located more recessed than the inner peripheral portion 131. Therefore, the burr 134 does not prevent the inner peripheral portion 131 from adhering to the release film 93.

[0052] In this way, in the outer frame member 13, even if there are burrs 134, the adhesion between the inner peripheral portion 131 and the release film 93 can be ensured. Therefore, when filling the gel material G, there is little risk of gel leakage from the gap between the release film 93 and the component bottom surface 130. When filling, there is little risk of air getting into the gel material G through the gap between the release film 93 and the component bottom surface 130.

[0053] (Comparative Example) Fig. 7 is an explanatory diagram of an outer frame member 15 of the comparative example. Fig. 7 shows a manufacturing method for the outer frame member 15 of the comparative example, the cross-sectional shape of the component bottom surface 150, and the state in which the release film 93 is pressed by the outer frame member 15 of the comparative example. As shown in Fig. 7, unlike the outer frame member 13 described above, the outer frame member 15 of the comparative example does not have a step portion on the component bottom surface 150. Furthermore, the outer frame member 15 of the comparative example has a burr 154 formed on the component bottom surface 150 along the parting surface of the mold.

[0054] If there is no step on component bottom surface 150, the position of burr 154 may prevent sufficient adhesion between the inner periphery of component bottom surface 150 and release film 93. As shown in FIG. 7, if the distance between the inner periphery of component bottom surface 150 and burr 154 is not large, the area near the inner periphery of component bottom surface 150 may not adhere to release film 93, resulting in a high risk of a gap. This can easily cause gel leakage when filling the gel material G. Air can also easily get into the gel material G.

[0055] (Action and effect) As described above, the damper member 100 of this embodiment has a cylindrical connecting body 10 and a cylindrical component joined to the outer or inner peripheral surface of the connecting body 10. The connecting body 10 is a viscoelastic material such as a gel-like material. The cylindrical components include an outer frame member 13 that surrounds the outer peripheral side of the connecting body 10 and is joined to the outer peripheral surface of the connecting body 10, and an inner frame member that is disposed on the inner peripheral side of the connecting body 10 and is joined to the inner peripheral surface of the connecting body 10. The outer frame member 13 has a component bottom surface 130 that faces one side LA1 in the component axial direction along the central axis LA of the outer frame member 13. The component bottom surface 130 comprises an inner peripheral portion 131 that extends from the inner peripheral edge of the component bottom surface 130 toward the outer peripheral side, an outer peripheral portion 132 that is positioned at a different position in the component axial direction from the inner peripheral portion 131 and extends from the outer peripheral edge of the component bottom surface 130 toward the inner peripheral side, and a step portion 133 that connects the inner peripheral portion 131 and the outer peripheral portion 132. The component bottom surface 130 has a burr 134 that protrudes toward one side LA1 in the component axial direction. The burr 134 is provided on the outer peripheral portion 132 that is recessed toward the other side LA2 in the component axial direction relative to the inner peripheral portion 131.

[0056] In this embodiment, when the component bottom surface 130 of the outer frame member 13 is brought into close contact with the release film 93, even if burrs 134 are present, the inner peripheral portion 131 of the component bottom surface 130 can ensure close contact with the release film 93. Therefore, there is little risk of gel leakage when filling the gel material G. If gel leakage does not occur, there is no need to remove the gel that has spilled out after mold release, thereby improving the productivity of the damper member 100. In addition, there is little risk of air getting into the gel material G when filling the gel material G. Therefore, there is little risk of air bubbles forming inside the connecting body 10 or at the boundary between the connecting body 10 and other components, which can suppress a decrease in the durability of the damper member 100 and an effect on the vibration characteristics.

[0057] In this embodiment, the inner peripheral portion 131 of the component bottom surface 130 is a flat surface perpendicular to the component axial direction. By providing a flat surface perpendicular to the pressing direction in the region of the component bottom surface 130 on the side where the gel material G is filled, it is easy to ensure close contact with the release film 93.

[0058] In this embodiment, burrs 134 formed on component bottom surface 130 are marks left by parting surface 81 of mold 80 used to manufacture outer frame member 13. Therefore, there is no need to perform a step of removing burrs during manufacture of outer frame member 13 in order to prevent gel leakage or air from entering gel material G, thereby improving the productivity of damper member 100.

[0059] In this embodiment, the height H of the step portion 133 in the component axial direction is 0.05 mm. It was confirmed that by making the height H of 33 0.05 mm or more, gel leakage does not occur and air bubbles do not form inside the connecting body 10 or at the boundary with other parts.

[0060] The actuator 1 of this embodiment includes the damper member 100 described above, a movable body 3 including a support shaft 30 extending in an axial direction that coincides with the component axial direction of the damper member 100, a support body 2 including a case 20 that surrounds the outer periphery of the support shaft 30 and supports the movable body 3 via the damper member 100, and a magnetic drive mechanism 6 that moves the movable body 3 in the axial direction relative to the support body 2. The damper member 100 is disposed such that the connecting body 10 surrounds the support shaft 30. The damper member 100 is connected to the support body 2 via an outer frame member 13, and is connected to the movable body 3 via an inner frame member 14. When the movable body 3 moves in the axial direction, the connecting body 10 undergoes shear deformation in the axial direction.

[0061] The actuator 1 of this embodiment connects the movable body 3 and the support body 2 with the damper member 100. As described above, the damper member 100 is less likely to cause gel leakage and less likely to produce bubbles during the manufacturing of the connecting body 10. This makes it possible to suppress a decrease in productivity during the manufacturing of the actuator 1 components. It is also possible to suppress a decrease in component durability due to bubbles and an effect on the vibration characteristics of the actuator 1.

[0062] In the manufacturing method of the damper member 100 of this embodiment, cushioning material 92 is placed on the bottom surface of a manufacturing jig 90A, and a release film 93 is laminated on top of the cushioning material 92. When the cylindrical outer frame member 13 and inner frame member 14 are positioned in the manufacturing jig 90A, the component bottom surface 130 of the outer frame member 13 and the component bottom surface of the inner frame member 14 press against the cushioning material 92 via the release film 93. Thereafter, a viscoelastic material such as a gel material G is filled into the gap S between the outer frame member 13 and the inner frame member 14, and the gel material G is cured to form the connecting body 10 and connect the connecting body 10 to the outer frame member 13 and the inner frame member 14. The connecting body 10 is then removed from the manufacturing jig 90A together with the outer frame member 13.

[0063] In this way, by sandwiching the cushioning material 92 and the release film 93 between the cylindrical part used as a mold and the manufacturing jig 90A, a gap between the cylindrical part and the manufacturing jig 90A can be eliminated. In particular, in this embodiment, even if a burr 134 is present on the component bottom surface 130 of the outer frame member 13, which is a cylindrical part, the step 133 on the component bottom surface 130 allows the inner peripheral portion 131 of the component bottom surface 130 and the release film 93 to be closely contacted with each other. This prevents gel leakage and the growth of air bubbles. Furthermore, the use of the release film 93 facilitates demolding of the connecting body 10. Furthermore, because gel leakage is prevented, there is no need to remove excess gel after demolding. This reduces the effort required for demolding and jig cleaning, improving the productivity of the connecting body 10.

[0064] (Embodiment 2) The positional relationship between the step portion 133 and the burr 134 may be different from that of the above embodiment. Fig. 8 is an explanatory diagram of an outer frame member 13A of embodiment 2. As shown in Fig. 8, the mold 80A of embodiment 2 has a structure that is divided at the position of the step portion 133 of the component bottom surface 130A. Therefore, the outer frame member 13A of embodiment 2 has a burr 134 formed at the position of the step portion 133.

[0065] Providing a dividing surface at the position of the step portion 133 makes it difficult for burrs 134 to become large. Therefore, when using the outer frame member 13A as a mold for manufacturing the connecting body 10, the area in which adhesion with the release film 93 is hindered by burrs 134 is small. Therefore, as shown in the lower diagram of FIG. 8, it is possible to ensure an area in which the inner circumferential portion 131 and the release film 93 are in close contact with each other. Therefore, similar to the above embodiment, there is little risk of gel leakage when filling the gel material G, and there is little risk of air getting into the gel material G.

[0066] (Embodiment 3) In the above embodiment, the stepped portion 133 has a cylindrical surface extending in the component axial direction and has a single step. However, the shape of the stepped portion 133 is not limited to this. For example, the stepped portion may have multiple steps. FIG. 9 is an explanatory diagram of an outer frame member 13B of embodiment 3. As shown in FIG. 9, the outer frame member 13B of embodiment 3 includes an inner circumferential portion 131, an outer circumferential portion 132, and a stepped portion 133B. The stepped portion 133B has a two-step shape. The stepped portion 133B includes an annular step 135 that protrudes outward from a midpoint in the component axial direction between the outer circumferential edge of the inner circumferential portion 131 and the inner circumferential edge of the outer circumferential portion 132. The stepped portion 133B includes an annular step 135 that protrudes toward the recessed side of the inner circumferential portion 131 or the outer circumferential portion 132.

[0067] As in the second embodiment, the mold 80B of the third embodiment is structured to be divided at the position of the step portion 133B of the component bottom surface 130B. Therefore, the outer frame member 13B has a burr 134 at the position of the step portion 133. More specifically, the mold 80B of the third embodiment is structured to be divided at the position of the outer peripheral edge of the annular step portion 135. Therefore, the burr 134 is formed at the position of the outer peripheral edge of the annular step portion 135.

[0068] In the third embodiment, a burr 134 is formed at a position recessed from the inner peripheral portion 131. Therefore, when the outer frame member 13B is used as a mold for manufacturing the connecting body 10, a portion where the inner peripheral portion 131 and the release film 93 are in close contact with each other can be ensured, as shown in the lower diagram of FIG. 9. This reduces the risk of gel leakage and air getting into the gel material G when filling the outer frame member 13B. Furthermore, in the third embodiment, the step is divided into two steps instead of one, and the height of each step is low. This makes it difficult for gas to accumulate in the step portion of the mold 80B during the manufacturing of the outer frame member 13B. This prevents the gas from deteriorating the part shape accuracy of the outer frame member 13B.

[0069] (Embodiment 4) The positional relationship between the inner peripheral portion 131 and the outer peripheral portion 132 in the component axial direction may be different from that of the above embodiment. FIG. 10 is an explanatory diagram of an outer frame member 13C of embodiment 4. As shown in FIG. 10, the component bottom surface 130C of the outer frame member 13C has the outer peripheral portion 132 protruding toward one side LA1 in the component axial direction, and the inner peripheral portion 131 recessed toward the other side LA2 in the component axial direction. The step portion 133 is located on the outer peripheral side of the radial center of the component bottom surface 130C. The mold 80C used to manufacture the outer frame member 13C is structured to be split at the step portion 133. Therefore, a burr 134 is formed at the step portion 133.

[0070] In the fourth embodiment, as in the second embodiment, burrs 134 are formed at the positions of the step portions 133, so the burrs 134 are less likely to become large. Furthermore, the burrs 134 are formed at positions away from the inner peripheral edge of the component bottom surface 130C. Therefore, even if the inner peripheral portion 131 of the component bottom surface 130C has a shape that is more recessed than the outer peripheral portion 132, a portion near the inner peripheral edge of the component bottom surface 130C where the release film 93 adheres can be secured. Therefore, when filling the gel material G, there is little risk of gel leakage and air getting into the gel material G.

[0071] (Other embodiments) (1) The above embodiments can be applied to a damper member in which the inner frame member 14 is not joined to the inner circumferential surface of the connecting body 10, a manufacturing method thereof, and an actuator including a damper member. For example, the end of the support shaft 30 is held at the radial center of the outer frame member 13 by a pressing jig 90B, and the tip surface of the support shaft 30 presses the cushioning material 92 and the release film 93. Then, gel material G is filled into the gap between the outer circumferential surface of the support shaft 30 and the outer frame member 13. This makes it possible to manufacture a damper member and an actuator in which the connecting body 10 is connected directly to the support shaft 30 without the inner frame member 14 interposed therebetween.

[0072] Alternatively, the outer peripheral surfaces of pins 95 provided on pressing jig 90B can be used as a mold for the inner peripheral side to manufacture connecting body 10. In this case, a release film is placed on the outer peripheral surfaces of pins 95, and the tip surfaces of pins 95 press cushioning material 92 and release film 93 placed on bottom surface 91 of manufacturing jig 90A. In this way, outer frame member 13 is bonded to the outer peripheral surface of connecting body 10, and a damper member can be manufactured in which the inner peripheral surface of connecting body 10 is exposed.

[0073] (2) The shape of the component bottom surface 130 of the outer frame member 13 of each of the above embodiments can be applied to the shape of the component bottom surface of the inner frame member 14. In this case, the parting surface of the mold is positioned so that a burr is formed on the recessed portion of the inner and outer peripheral portions of the component bottom surface, in other words, on the portion located on the other side LA2 in the component axial direction. Alternatively, the parting surface of the mold is positioned so that a burr is formed at the position of the step portion. For example, the outer peripheral portion of the component bottom surface of the inner frame member 14 is formed to be more recessed than the inner peripheral portion, and the parting surface of the mold is positioned so that a burr is formed on the outer peripheral portion or the step portion. This ensures close contact between the component bottom surface of the inner frame member 14 and the release film 93, thereby suppressing gel leakage and bubble growth.

[0074] (3) When the shape of the component bottom surface 130 of the outer frame member 13 of each of the above embodiments is applied to the shape of the component bottom surface of the inner frame member 14, this embodiment can be applied to a damper member in which the outer frame member 13 is not joined to the outer peripheral surface of the connecting body 10, a manufacturing method thereof, and an actuator equipped with a damper member. For example, the connecting body 10 can be manufactured by using the inner peripheral surface 96 of the pressing jig 90B as a mold and placing a release film on the inner peripheral surface 96. This results in a damper member in which the inner frame member 14 is joined to the inner peripheral surface of the connecting body 10 and the outer peripheral surface of the connecting body 10 is exposed.

[0075] (summary) A summary of this disclosure is provided below. (1) A damper member having a cylindrical viscoelastic member and a cylindrical part joined to an outer peripheral surface or an inner peripheral surface of the viscoelastic member, the tubular part has a part bottom surface facing one side in a part axial direction along a central axis of the tubular part, The component bottom surface is an inner peripheral portion that extends from an inner peripheral edge of the bottom surface of the component toward an outer peripheral side; an outer peripheral portion that is positioned differently from the inner peripheral portion in the component axial direction and that extends from the outer peripheral edge of the component bottom surface toward the inner peripheral side; a step portion connecting the inner circumferential portion and the outer circumferential portion, a burr protruding toward one side in the component axial direction is formed on the component bottom surface, A damper member characterized in that the burr is located on the other side of the inner peripheral portion and the outer peripheral portion in the component axial direction, or on the step portion.

[0076] (2) the tubular part is an outer frame member that surrounds the outer periphery of the viscoelastic member, The damper member according to (1) above, wherein the viscoelastic member is bonded to the inner peripheral surface of the outer frame member.

[0077] (3) the outer peripheral portion is recessed toward the other side in the component axial direction relative to the inner peripheral portion, The damper member according to (2) above, wherein the burrs are disposed on the outer peripheral portion or the stepped portion.

[0078] (4) A damper member as described in (2) or (3) above, characterized in that it has an inner frame member into which the support shaft fits, and the inner frame member is joined to the inner surface of the viscoelastic member.

[0079] (5) A damper member according to any one of (2) to (4) above, characterized in that of the outer peripheral portion and the inner peripheral portion, at least the inner peripheral portion is a plane perpendicular to the component axis direction.

[0080] (6) The damper member according to any one of (1) to (5) above, wherein the burrs are marks on the parting surface of a mold used to manufacture the tubular part.

[0081] (7) The step portion is A damper member according to any one of (1) to (6) above, characterized in that it has an annular step portion that protrudes from a position between the outer peripheral edge of the inner peripheral portion and the inner peripheral edge of the outer peripheral portion toward the portion of the inner peripheral portion and the outer peripheral portion that is located on the other side in the component axial direction.

[0082] (8) The damper member according to any one of (1) to (7) above, wherein the height of the step portion in the component axial direction is 0.05 mm or more.

[0083] (9) The damper member according to any one of (1) to (8) above, a movable body having a support shaft extending in an axial direction that coincides with the component axial direction; a support body including a case surrounding an outer periphery of the support shaft and supporting the movable body via the damper member; a magnetic drive mechanism that moves the movable body relative to the support body in the axial direction, the damper member is arranged so that the viscoelastic member surrounds the support shaft, and is connected to the support shaft or the case via the cylindrical part, An actuator, characterized in that when the movable body moves in the axial direction, the viscoelastic member undergoes shear deformation in the axial direction.

[0084] (10) A method for manufacturing a damper member according to any one of (1) to (8) above, A cushioning material is placed on the bottom surface of the manufacturing jig, and a release film is laminated on the cushioning material; When the cylindrical part is positioned in the manufacturing jig, the bottom surface of the part presses the cushion material via the release film, Filling the inner circumferential side or the outer circumferential side of the cylindrical part with a viscoelastic material; hardening the viscoelastic material to form the viscoelastic member and connect the viscoelastic member to the tubular part; and removing the viscoelastic member together with the cylindrical part from the manufacturing jig.

[0085] (11) A method for manufacturing the damper member described in (4) above, A cushioning material is placed on the bottom surface of the manufacturing jig, and a release film is laminated on the cushioning material; When positioning the outer frame member and the inner frame member in the manufacturing jig, the outer frame member and the inner frame member are pressed toward the bottom surface to bring the inner frame member into close contact with the cushion material via the release film, and at least the inner peripheral portion of the outer frame member is brought into close contact with the cushion material via the release film; Filling a gap between the inner frame member and the outer frame member with a viscoelastic material; hardening the viscoelastic material to form the viscoelastic member and connect the viscoelastic member to the inner frame member and the outer frame member; a manufacturing method for a damper member, comprising removing the viscoelastic member together with the inner frame member and the outer frame member from the manufacturing jig; [Explanation of symbols]

[0086] 1...actuator, 2...support, 3...movable body, 4...coil holder, 6...magnetic drive mechanism, 7...wiring board, 10...connecting body, 11...first connecting body, 12...second connecting body, 13, 13A, 13B, 13C...outer frame member, 14...inner frame member, 15...outer frame member of comparative example, 20...case, 21...first lid member, 22...second lid member, 24...case body, 25...second outer frame member fixing portion, 26...lid portion, 27...locking portion, 28...regulating portion, 30...support shaft, 31...first yoke, 32...second yoke, 33...first magnetic member, 34...second magnetic member, 35...yoke, 36...first inner frame member, 37...second inner frame member, 41...first outer frame member fixing portion, 42...body portion, 51...first outer frame member, 52...second outer frame member, 61...magnet, 62...coil, 64...terminal pin, 65...notch portion, 6 6...Cover, 69...Substrate fixing portion, 80, 80A, 80B, 80C...Mold, 81...Parting surface, 90B...Pressing jig, 90A...Manufacturing jig, 91...Bottom surface, 92...Cushioning material, 93...Release film, 94...Opposite surface, 95...Pin, 96...Inner surface, 97...Recess, 98...Pressing mechanism, 99...Dispenser, 100...Damper member, 111, 112...End surface, 130, 130 A, 130B, 130C...bottom surface of component, 131...inner peripheral portion, 132...outer peripheral portion, 133, 133B...step portion, 134...burr, 135...annular step portion, 150...bottom surface of component, 154...burr, G...gel material, L...central axis, L1...one side in the axial direction, L2...other side in the axial direction, LA...central axis, LA1...one side in the axial direction of component, LA2...other side in the axial direction of component, S...gap

Claims

1. A damper member having a cylindrical viscoelastic member and a cylindrical part joined to an outer peripheral surface or an inner peripheral surface of the viscoelastic member, the tubular part has a part bottom surface facing one side in a part axial direction along a central axis of the tubular part, The component bottom surface is an inner peripheral portion that extends from an inner peripheral edge of the bottom surface of the component toward an outer peripheral side; an outer peripheral portion that is positioned differently from the inner peripheral portion in the component axial direction and that extends from the outer peripheral edge of the component bottom surface toward the inner peripheral side; a step portion connecting the inner circumferential portion and the outer circumferential portion, a burr protruding toward one side in the component axial direction is formed on the component bottom surface, A damper member characterized in that the burr is located on the other side of the inner peripheral portion and the outer peripheral portion in the component axial direction, or on the step portion.

2. the tubular part is an outer frame member that surrounds the outer periphery of the viscoelastic member, 2. The damper member according to claim 1, wherein the viscoelastic member is bonded to an inner peripheral surface of the outer frame member.

3. the outer peripheral portion is recessed toward the other side in the component axial direction relative to the inner peripheral portion, 3. The damper member according to claim 2, wherein the burrs are disposed on the outer circumferential portion or the stepped portion.

4. 3. The damper member according to claim 2, further comprising an inner frame member into which the support shaft fits, the inner frame member being joined to the inner peripheral surface of the viscoelastic member.

5. 3. The damper member according to claim 2, wherein at least the inner peripheral portion of the outer peripheral portion and the inner peripheral portion is a plane perpendicular to the component axial direction.

6. 2. The damper member according to claim 1, wherein the burrs are marks on a parting surface of a mold used to manufacture the tubular part.

7. The step portion is 2. The damper member according to claim 1, further comprising an annular step portion that protrudes from a position between the outer peripheral edge of the inner peripheral portion and the inner peripheral edge of the outer peripheral portion toward a portion of the inner peripheral portion or the outer peripheral portion that is located on the other side in the component axial direction.

8. 2. The damper member according to claim 1, wherein the height of the step portion in the component axial direction is 0.05 mm or more.

9. The damper member according to any one of claims 1 to 8; a movable body having a support shaft extending in an axial direction that coincides with the component axial direction; a support body including a case surrounding an outer periphery of the support shaft and supporting the movable body via the damper member; a magnetic drive mechanism that moves the movable body relative to the support body in the axial direction, the damper member is arranged so that the viscoelastic member surrounds the support shaft, and is connected to the support shaft or the case via the cylindrical part, When the movable body moves in the axial direction, the viscoelastic member undergoes shear deformation in the axial direction. An actuator characterized by its shape.

10. A method for manufacturing the damper member according to any one of claims 1 to 8, comprising: A cushioning material is placed on the bottom surface of the manufacturing jig, and a release film is laminated on the cushioning material; When the cylindrical part is positioned in the manufacturing jig, the bottom surface of the part presses the cushion material via the release film, Filling the inner circumferential side or the outer circumferential side of the cylindrical part with a viscoelastic material; hardening the viscoelastic material to form the viscoelastic member and connect the viscoelastic member to the tubular part; and removing the viscoelastic member together with the cylindrical part from the manufacturing jig.

11. A method for manufacturing a damper member according to claim 4, comprising the steps of: A cushioning material is placed on the bottom surface of the manufacturing jig, and a release film is laminated on the cushioning material; When positioning the outer frame member and the inner frame member in the manufacturing jig, the outer frame member and the inner frame member are pressed toward the bottom surface to bring the inner frame member into close contact with the cushion material via the release film, and at least the inner peripheral portion of the outer frame member is brought into close contact with the cushion material via the release film; Filling a gap between the inner frame member and the outer frame member with a viscoelastic material; hardening the viscoelastic material to form the viscoelastic member and connect the viscoelastic member to the inner frame member and the outer frame member; a manufacturing method for a damper member, comprising removing the viscoelastic member together with the inner frame member and the outer frame member from the manufacturing jig;

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