Electromagnetic brake system

Abstract

To suppress an occurrence of a problem by thermal expansion in a spring hole member for lightening the weight of a yoke.SOLUTION: An electromagnetic brake device 1 includes a plurality of springs 6 for energizing a movable plate 4 in an axial direction, a yoke 51 having an inner cylinder part 53 and an outer cylinder part 54, a coil 52, and a spring hold member 70. The outer cylinder part 54 has a member storage part 60 for storing the spring hole member 70. The member storage part 60 has inner surfaces 61, 62, and 63. The spring hole member 70 includes outer surfaces 71, 72, and 73 brought into contact with the inner surfaces 61, 62, and 63, respectively and slits 79. The slits 79 are provided at parts arranged so as to be sandwiched between spring holes 78 and the inner surface 63 in a prescribed direction in the outer surface 73, and are arranged so as to extend over the whole in the axial direction of the outer surface 73.SELECTED DRAWING: Figure 8

Description

【Technical Field】 【0001】 The present invention relates to an electromagnetic brake device. 【Background Art】 【0002】 Patent Document 1 discloses an electromagnetic brake device that brakes a disk (hereinafter, a rotating member) that rotates with a predetermined axial direction as the rotation axis direction. The electromagnetic brake device includes a movable plate (hereinafter, a movable member) disposed adjacent to the rotating member in the axial direction, a plurality of springs that bias the movable member toward the rotating member in the axial direction, and an electromagnet for separating the movable member from the rotating member in the axial direction. The movable member is made of a magnetic material. The electromagnet has a yoke disposed on the opposite side of the rotating member with the movable member interposed therebetween in the axial direction, and a coil housed in the yoke. More specifically, the yoke has a cylindrical inner cylinder portion formed of a magnetic material and extending in the axial direction, and an outer cylinder portion formed of a magnetic material and disposed outside the inner cylinder portion in the radial direction. When the coil is energized, magnetic flux is generated, and the magnetic flux passes through the inner cylinder portion, the movable member, and the outer cylinder portion. As a result, a magnetic attraction force (hereinafter, simply referred to as magnetic force) is generated between the movable member and the yoke, and the movable member is attracted to the yoke and separated from the rotating member. When the energization of the coil is cut off, the magnetic force weakens in a short time. When the biasing force by the spring becomes relatively stronger than the magnetic force, the movable member is brought into contact with the rotating member by the spring. As a result, the brake by the frictional force is activated. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Laid-Open No. 61-88032 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 Generally, the area of ​​the cross-section of the outer cylinder perpendicular to the axial direction is larger than the area of ​​the cross-section of the inner cylinder perpendicular to the axial direction. In other words, the cross-sectional area of ​​the magnetic path through which the magnetic flux passes is larger in the outer cylinder. Therefore, by reducing the cross-sectional area of ​​the outer cylinder, it is possible to reduce the weight of the outer cylinder while allowing sufficient magnetic flux to pass through it. However, the outer cylinder generally requires a region in which multiple holes (hereinafter referred to as multiple spring holes) are formed to accommodate the multiple springs mentioned above. Therefore, studies are being conducted to replace the part of the outer cylinder in which the spring holes are formed and its surrounding area with a component made of a resin material or the like, which has a lower density than magnetic material. For the sake of explanation, such a component will be referred to as the spring hole component below. 【0005】 In electromagnetic brakes, Joule heating occurs in the coil (and yoke) when current flows through the coil. Consequently, the spring hole member is also heated by heat conduction. It has been found that, due to the fact that the material of the spring hole member expands more easily with heat than the material of the yoke (i.e., magnetic material), various problems occur, such as deformation of the spring hole and / or the occurrence of cracks in the spring hole member. 【0006】 The objective of the present invention is to suppress the occurrence of problems caused by thermal expansion in a spring hole member for reducing the weight of a yoke. [Means for solving the problem] 【0007】 The electromagnetic brake device of the first invention is an electromagnetic brake device for braking a rotating member that rotates with a predetermined axial direction as the rotation axis, comprising: a movable member disposed adjacent to one side of the rotating member in the axial direction, configured to be movable in the axial direction, and braking the rotation of the rotating member when in contact with the rotating member; a plurality of spring members that bias the movable member toward the other side in the axial direction; a cylindrical inner cylinder portion extending in the axial direction and made of a magnetic material; and a cylindrical outer cylinder portion disposed outside the inner cylinder portion in the radial direction of the inner cylinder portion and made of a magnetic material. The movable member comprises a yoke positioned on one side of the movable member in the axial direction, a coil positioned outside the inner cylinder and inside the outer cylinder in the radial direction of the yoke, which generates a magnetic force between the movable member and the yoke when current is flowing, and a spring hole member housed in the outer cylinder, positioned to extend in the axial direction, and configured to house at least one of the plurality of spring members, made of a material with a higher coefficient of thermal expansion and lower density than the material of the yoke, wherein the outer cylinder has a housing space formed therein for housing the spring hole member. The member housing portion has a housing section, and when viewed from the axial direction, the member housing section has a first inner surface that extends in a first direction inclined with respect to a predetermined direction in which a predetermined virtual line passing through the housing space extends, and is located on one side of the virtual line in an orthogonal direction perpendicular to the predetermined direction; a second inner surface that extends in a second direction inclined with respect to the predetermined direction opposite to the first direction, and is located on the other side of the virtual line in the orthogonal direction; and when viewed from the axial direction, it extends in a direction that intersects both the first and second directions and is located to intersect with the virtual line. The spring hole member has a spring hole that penetrates the spring hole member in the axial direction and is configured to accommodate one of the plurality of spring members, a first outer surface arranged to contact the first inner surface, a second outer surface arranged to contact the second inner surface, and a third outer surface arranged to contact the third inner surface.The third outer surface is characterized by having a slit provided in a portion of the third outer surface that is sandwiched between the spring hole and the third inner surface in the predetermined direction, and which extends over the entire area of ​​the third outer surface in the axial direction. 【0008】 In this invention, the spring hole member can be press-fitted into the member housing such that the first, second, and third outer surfaces of the spring hole member are in contact with the first, second, and third inner surfaces of the member housing, respectively. Furthermore, in this invention, when the spring hole member expands due to Joule heating when the coil is energized, the third outer surface of the spring hole member is pushed back by the third inner surface of the member housing. At that time, internal stress is generated near the third outer surface and near the spring hole, but since a slit is provided, a place for the internal stress to escape is created, and the internal stress can be alleviated. Therefore, in a spring hole member used to reduce the weight of the outer cylinder, the occurrence of problems due to thermal expansion can be suppressed. 【0009】 The electromagnetic brake device of the second invention is characterized in that, in the first invention, the third inner surface is arranged to face inward in the radial direction at least, the member housing portion opens to the inward side of the outer cylinder portion in the radial direction because the first inner surface and the second inner surface extend to the inward end of the outer cylinder portion in the radial direction, and the yoke has a coil housing groove in which the coil is housed, and an insulating hardened material is filled into the coil housing groove. 【0010】 In this invention, with the spring hole member housed in the member housing and the coil housed in the housing groove, a liquid hardening material is poured into the housing groove, causing a portion of the hardening material to come into contact with the spring hole member. Subsequently, when the hardening material hardens, the spring hole member can be fixed by the hardened material. Therefore, the spring hole member can be mounted even more stably. 【0011】 The electromagnetic brake device of the third invention is characterized in that, in the second invention, the member housing portion has a first bottom surface facing the other side in the axial direction, the coil housing groove has a second bottom surface facing the other side in the axial direction and positioned on one side of the first bottom surface in the axial direction, and the spring hole member is positioned between the first bottom surface and the second bottom surface in both the axial and radial directions and has a projection that protrudes at least to one side in the axial direction. 【0012】 When liquid hardening material is poured into the housing groove, there is a risk that some of the hardening material that reaches the second bottom surface may seep into the member housing through the gap between the spring hole member and the first bottom surface. In the present invention, the protruding portion can prevent the hardening material from flowing into this gap. 【0013】 The electromagnetic brake device of the fourth invention is characterized in that, in the second or third invention, it has an injection portion provided at the inner end of the spring hole member in the radial direction for injecting the liquid hardening material into the coil housing groove. 【0014】 Conventionally, an injection port is formed in the outer cylinder to allow the liquid hardening material to be injected into the containment groove. This requires extra processing work on the outer cylinder. In the present invention, there is no need to form an injection port in the outer cylinder, thus reducing the processing work on the outer cylinder. 【0015】 The electromagnetic brake device of the fifth invention is characterized in that, in any of the first to fourth inventions, the spring hole member is formed of an insulating material and has an extended portion that extends inward in the radial direction beyond the inner circumferential surface of the outer cylinder portion. 【0016】 In this invention, for example, even if the coil is about to come into contact with the inner surface of the outer cylinder during the manufacturing process of an electromagnetic brake device, the coil can be prevented from coming into contact with the inner surface of the outer cylinder by being supported by the extended portion. Therefore, the insulating state between the coil and the outer cylinder can be effectively maintained. [Brief explanation of the drawing] 【0017】 [Figure 1] This is a view of the electromagnetic brake device according to the present embodiment as seen from the axial direction. [Figure 2] (a) and (b) are cross-sectional views taken along line II-II of FIG. 1. [Figure 3] (a) is a view of the yoke as seen from the axial direction, and (b) is a perspective view of the yoke including a cross-sectional view in which a part of the yoke is cut away. [Figure 4] It is an enlarged view of a part of FIG. 3(a). [Figure 5] This is a view of the yoke and a plurality of spring hole members as seen from the axial direction. [Figure 6] (a) to (d) are views of the spring hole member as seen from various directions. [Figure 7] (a) is a perspective view of the yoke and the spring hole member including a cross-sectional view in which a part of the yoke and a part of the plurality of spring hole members are cut away, and (b) is an enlarged view of a part of (a). [Figure 8] It is an enlarged view of a part of FIG. 5. [Figure 9] (a) to (c) are explanatory views each showing three modification examples. [Figure 10] (a) to (c) are explanatory views each showing another three modification examples. [Figure 11] (a) and (b) are explanatory views each showing yet another three modification examples. [[ID=​​​​​​​​​ The general outline of the electromagnetic brake device 1 will be explained with reference to Figures 1 to 2(b). Figure 1 is a view of the electromagnetic brake device 1 from the side of the fixed plate 3, which will be described later, in the axial direction. Figure 2(a) is a cross-sectional view taken along line II-II of Figure 1. More specifically, Figure 2(a) shows the state of the electromagnetic brake device 1 when the coil 52, which will be described later, is energized (i.e., when current is flowing through the coil 52). Figure 2(b) is a cross-sectional view taken along line II-II of Figure 1, similar to Figure 2(a). More specifically, Figure 2(b) shows the state of the electromagnetic brake device 1 when no current is flowing through the coil 52. 【0020】 The electromagnetic brake device 1 is a device for stopping the operation of equipment (not shown) to which a rotating shaft RS (see Figure 2) is connected by braking the rotation of the rotating shaft RS. As shown in Figures 1 to 2(a), the electromagnetic brake device 1 comprises a rotating member 2, a fixed plate 3, a movable plate 4 (movable member of the present invention), an electromagnet unit 5, and a plurality of springs 6 (spring members of the present invention). The electromagnetic brake device 1 is configured to activate the brake by sandwiching the rotating member 2 attached to the rotating shaft RS between the fixed plate 3 and the movable plate 4. More specifically, the electromagnet unit 5 pulls the movable plate 4 towards the rotating member 2, separating it from the rotating member 2, thereby enabling the rotation of the rotating member 2. Furthermore, when the state in which the electromagnet unit 5 is pulling towards the movable plate 4 is released (hereinafter referred to as "the electromagnet unit 5 releasing the movable plate 4"), the movable plate 4 is pressed against the rotating member 2 by the plurality of springs 6 (see Figure 2(b)). This activates the brake. 【0021】 (Each component) Next, we will explain the components of the electromagnetic brake device 1 in more detail, referring to Figures 1 to 2(b). 【0022】 The rotating member 2 comprises a hub 21 and a disk 22. The hub 21 is a substantially cylindrical portion fixed to the tip RS1 of the rotating shaft RS. The hub 21 is, for example, a known spline collar. The hub 21 has a fitting portion 21a that fits with, for example, the inner circumference of the disk 22. The disk 22 is a substantially disc-shaped member positioned radially outside the hub 21. The inner circumference of the disk 22 fits with the fitting portion 21a of the hub 21 (see Figure 1). This allows the disk 22 to rotate integrally with the hub 21. Alternatively, the hub 21 and the disk 22 may be formed from a single member. 【0023】 For the sake of explanation, the following definitions of one side and the other side in the axial direction are shown in Figure 2(a). The lower side of Figure 2(a) is one side in the axial direction. The upper side of Figure 2(a) is the other side in the axial direction. Although not shown in Figure 2(b), the definitions of one side and the other side in the axial direction are the same in Figure 2(a) and Figure 2(b). As shown in Figures 2(a) and 2(b), an end face 22a is formed at one end of the disk 22 in the axial direction. An end face 22b is formed at the other end of the disk 22 in the axial direction. End face 22a is a surface arranged to be in contact with the end face 4b (described later) of the movable plate 4. End face 22b is a surface arranged to be in contact with the end face 3a (described later) of the fixed plate 3. 【0024】 The fixing plate 3 is, for example, a substantially disc-shaped member. As shown in Figures 2(a) and 2(b), the fixing plate 3 is positioned adjacent to the other side of the disk 22 in the axial direction. An end face 3a is formed at one end of the fixing plate 3 in the axial direction. The end face 3a is a surface positioned to be in contact with the end face 22b of the disk 22. As shown in Figure 3, the fixing plate 3 has a plurality of through holes 3b through which the shafts of a plurality of bolts B are inserted. The fixing plate 3 is fixed to the electromagnet unit 5 by a plurality of bolts B. 【0025】 The movable plate 4 is a substantially disc-shaped member. The movable plate 4 is made of a magnetic material such as iron. As shown in Figures 2(a) and 2(b), the movable plate 4 is positioned adjacent to one side of the disk 22 in the axial direction. The movable plate 4 is positioned adjacent to the other side of the electromagnet unit 5 in the axial direction. The movable plate 4 is positioned on the radially outer side of the rotation axis RS. An end face 4a is formed at one end of the movable plate 4 in the axial direction. End face 4a is a surface positioned to be in contact with an end face 54b formed on the yoke 51, which will be described later. An end face 4b is formed at the other end of the movable plate 4 in the axial direction. End face 4b is a surface positioned to be in contact with an end face 22a of the disk 22. End faces 4a and 4b are substantially parallel. 【0026】 As shown in Figures 2(a) and 2(b), the movable plate 4 has multiple through holes 4c through which multiple collars C are inserted. Each through hole 4c penetrates the movable plate 4 in the axial direction. Each of the multiple collars C extends in the axial direction. The multiple collars C are fixed between the fixed plate 3 and the electromagnet unit 5 by multiple bolts B. The movable plate 4 is guided in the axial direction by the multiple collars C. This makes the movable plate 4 movable in the axial direction. More specifically, the movable plate 4 is movable between a brake release position (see Figure 2(a)) and a brake activation position (see Figure 2(b)). The brake release position is the position of the movable plate 4 when it is attracted to the electromagnet unit 5 in the axial direction. The brake activation position is the position of the movable plate 4 when it is released from the electromagnet unit 5 and is fully pressed against the disc 22. 【0027】 The electromagnet unit 5 is a unit for attracting and releasing the movable plate 4. As shown in Figures 2(a) and 2(b), the electromagnet unit 5 is positioned adjacent to one side of the movable plate 4 in the axial direction. The electromagnet unit 5 has a yoke 51 and a coil 52. 【0028】 The yoke 51 is a generally cylindrical member extending along the axial direction. The yoke 51 is made of a magnetic material such as iron. The yoke 51 is positioned on the radially outer side of the rotation axis RS. The yoke 51 has an inner cylinder portion 53, an outer cylinder portion 54, and a disc portion 55. The inner cylinder portion 53, the outer cylinder portion 54, and the disc portion 55 form a coil housing groove 56 in which the coil 52 is housed. In this embodiment, the inner cylinder portion 53, the outer cylinder portion 54, and the disc portion 55 are integrally formed from a single member. However, it is not limited to this. 【0029】 The inner cylinder portion 53 is a substantially cylindrical part located immediately outside the radial axis RS. For convenience of explanation, one end of the inner cylinder portion 53 in the axial direction is shown by a dashed line in Figures 2(a) and 2(b). The inner cylinder portion 53 has an outer peripheral surface 53a formed at its radial outer end. The outer peripheral surface 53a is positioned to face the inner peripheral surface 54a, which will be described later, in the radial direction. 【0030】 The outer cylinder portion 54 is a substantially cylindrical portion located radially outside the inner cylinder portion 53. For convenience of explanation, one end of the outer cylinder portion 54 in the axial direction is shown by a dashed line in Figures 2(a) and 2(b). The outer cylinder portion 54 has an inner circumferential surface 54a formed at its radially inner end. The inner circumferential surface 54a is positioned radially, spaced apart from the outer circumferential surface 53a of the inner cylinder portion 53 and facing the outer circumferential surface 53a. An end face 54b is formed at the other end of the outer cylinder portion 54 in the axial direction. The end face 54b is positioned to be in contact with the end face 4a of the movable plate 4. The outer cylinder portion 54 has a plurality of screw holes 54c that extend axially. A plurality of bolts B are screwed into each of the plurality of screw holes 54c. The outer cylinder portion 54 has a plurality of mounting holes 54d (see Figures 3(a) and 3(b)) that extend axially. The plurality of mounting holes 54d are holes for attaching the electromagnetic brake device 1 to other devices (i.e., devices that are braked by the electromagnetic brake device 1). The outer cylinder portion 54 has a plurality of spring holes 57 that extend axially. A spring 6 is housed in each of the plurality of spring holes 57. 【0031】 The disc portion 55 is a substantially disc-shaped part. The disc portion 55 is located on one side in the axial direction of the inner cylinder portion 53 and the outer cylinder portion 54. For convenience of explanation, the boundary between the disc portion 55 and the inner cylinder portion 53 and the boundary between the disc portion 55 and the outer cylinder portion 54 are shown by dashed lines in Figures 2(a) and 2(b). An upper surface 55a (the second bottom surface of the present invention) is formed at the upper end of the disc portion 55. The upper surface 55a is located radially between the outer circumferential surface 53a of the inner cylinder portion 53 and the inner circumferential surface 54a of the outer cylinder portion 54. The upper surface 55a is connected to the outer circumferential surface 53a and the inner circumferential surface 54a. The coil housing groove 56 described above is formed by the outer circumferential surface 53a, the inner circumferential surface 54a and the upper surface 55a. 【0032】 The coil housing groove 56 houses the coil 52 and is further filled with, for example, a curing member 58 (see Figures 2(a) and 2(b)). The curing member 58 is a member formed of an insulating material to reliably insulate the yoke 51 and the coil 52. Hereinafter, the material of the curing member 58 will be referred to as the curing material. The curing material is, for example, a thermosetting resin material such as epoxy resin (also called mold resin), but is not limited to this. In this embodiment, an injection port 54e (see Figures 3(a) and 3(b)) is formed on the inner circumferential surface 54a of the outer cylinder portion 54. The injection port 54e is for injecting liquid curing material into the coil housing groove 56 during the manufacturing process in which the electromagnetic brake device 1 is manufactured. During the manufacturing process of the electromagnetic brake device 1, the liquid curing material is poured through the injection port 54e into the coil housing groove 56 in which the coil 52 is housed. Subsequently, the curing material is heat-cured to form the curing member 58. 【0033】 The coil 52 is configured to generate magnetic flux through the movable plate 4 and the yoke 51 when current is flowing. The coil 52 is located in the coil housing groove 56. The coil 52 is wound in the circumferential direction (see the symbol for coil 52 in Figure 2(a), etc.). The longitudinal ends of the wire members forming the coil 52 are located outside the yoke 51 through through holes 54f (see Figure 3(a)) that penetrate the outer cylinder 54 radially, and are connected to a power supply (not shown). The magnetic flux generated by the current flowing through the coil 52 passes through, for example, the inner cylinder 53, the movable plate 4, the outer cylinder 54, and the disc 55 in this order (not shown). In this way, a magnetic path through which the magnetic flux passes is formed around the entire circumference of the electromagnet unit 5. 【0034】 The multiple springs 6 are biasing members for biasing the movable plate 4 axially toward the other side. Each of the multiple springs 6 is, for example, a known compression coil spring. The multiple springs 6 are each housed in a plurality of spring holes 57. The multiple springs 6 are, for example, arranged at approximately equal intervals in the circumferential direction. In this embodiment, six springs 6 are housed in six spring holes 57 (see Figure 1). 【0035】 (Overview of the operation of the electromagnetic brake system) The operation of the electromagnetic brake device 1 having the above configuration will now be outlined. When the coil 52 is energized, a magnetic force (magnetic attraction force) is generated between the movable plate 4 and the yoke 51 due to the magnetic flux. When the magnetic force becomes stronger than the biasing force of the multiple springs 6 (i.e., elastic restoring force, also called spring load), the movable plate 4 moves to one side in the axial direction against the biasing force and is attracted to the yoke 51 (see Figure 2(a)). At this time, the movable plate 4 moves to the brake release position. When the movable plate 4 is in the brake release position, the rotating member 2 is slightly separated from the fixed plate 3 and the movable plate 4 in the axial direction. As a result, the rotating member 2 and the rotating shaft RS become rotatable. 【0036】 On the other hand, when the power to coil 52 is cut off, the magnetic force weakens rapidly. When the biasing force from spring 6 becomes relatively stronger than the magnetic force, the movable plate 4 separates from yoke 51 (i.e., is released from electromagnet unit 5). At this time, the movable plate 4 moves to the brake operating position due to the biasing force. When the movable plate 4 is pressed against the rotating member 2, the rotating member 2 is sandwiched between the fixed plate 3 and the movable plate 4. As a result, a frictional force acts between the end face 22a of disc 22 and the end face 4b of movable plate 4, and also between the end face 22b of disc 22 and the end face 3a of fixed plate 3. As a result, the rotation of the rotating member 2 and the rotating shaft RS is braked (i.e., the brake is activated). 【0037】 Here, studies are being conducted to replace the portion of the outer cylinder 54 in which the spring hole 57 is formed and its surrounding area with a component made of a resin material or the like, which is lighter than the magnetic material. For the sake of explanation, such a component will be referred to as the spring hole component below. In the electromagnetic brake device 1, when current flows through the coil 52, Joule heat is generated in the coil 52 (and the yoke 51). Consequently, the spring hole component is also heated by heat conduction. At that time, it has been found that various problems occur, such as deformation of the spring hole 57 and / or the occurrence of cracks in the spring hole component, due to the fact that the material of the spring hole component is more susceptible to thermal expansion than the material of the yoke 51 (i.e., the magnetic material). Therefore, in order to suppress the occurrence of problems due to thermal expansion in the spring hole component 70 (described later) for reducing the weight of the yoke 51, the electromagnetic brake device 1 is configured as follows. 【0038】 (Detailed configuration of the electromagnetic brake system) The detailed configuration of the electromagnetic brake device 1 will now be described. The electromagnetic brake device 1 has a plurality of member housing sections 60 formed in the yoke 51 (see Figure 3(a), etc.) and a plurality of spring hole members 70 (see Figure 5, etc.) each housed in the plurality of member housing sections 60. 【0039】 The member housing section 60 will be explained with reference to Figures 3(a) to 4. Figure 3(a) is a view of the yoke 51 from the axial direction. Figure 3(b) is a perspective view of the yoke 51, including a cross-sectional view in which a part of the yoke 51 is cut out. In other words, Figure 3(b) is a view of a part of the perspective view of the yoke 51 with two cross-sectional views parallel to the central axis of the yoke 51 added. Figure 4 is an enlarged view of a part of Figure 3(a). More specifically, Figure 4 is an enlarged view of one of the multiple member housing sections 60 (member housing section 60A) and its surrounding area. In Figures 3(a), 3(b), and 4, the illustration of members other than the yoke 51 is omitted. 【0040】 The direction of a member housing section 60A, which is one of the multiple member housing sections 60, is defined. First, as shown in Figure 4, one predetermined direction parallel to the radial direction is defined as the predetermined direction. For the sake of explanation, in the predetermined direction, the side closer to the central axis of the yoke 51 (i.e., the inner side in the radial direction) is defined as one side, and the opposite side is defined as the other side. A predetermined hypothetical straight line extending in the predetermined direction is called the hypothetical straight line LA. The direction perpendicular to both the predetermined direction and the axial direction is defined as the orthogonal direction. For the sake of explanation, the left side of Figure 4 is defined as one side in the orthogonal direction. The right side of Figure 4 is defined as the other side in the orthogonal direction. 【0041】 The following description will focus on member housing portion 60A as a representative of the multiple member housing portions 60. Member housing portion 60A is a portion in which a housing space S (see Figures 3(a) to 4) for housing one of the multiple spring hole members 70 is formed. Member housing portion 60A is formed in the outer cylindrical portion 54 of the yoke 51. As shown in Figures 3(a) to 4, member housing portion 60A has inner surfaces 61, 62, 63, 64 and 65, a bottom surface 66 (the first bottom surface of the present invention), two positioning holes 67, a bottom surface 68, and a stepped surface 69. These components of member housing portion 60A are components that form the housing space S. 【0042】 The inner surface 61 (the first inner surface of the present invention; see the thick line in Figure 4) is a surface that extends at least along the axial direction. The inner surface 61 is one of the surfaces for press-fitting the spring hole member 70 into the housing space S. The inner surface 61 extends in the axial direction from the position where the end surface 54b is formed to the position where the bottom surface 66 is formed. As shown in Figure 4, when viewed from the axial direction, the inner surface 61 is located on one side of a virtual straight line LA in the orthogonal direction. When viewed from the axial direction, the inner surface 61 extends substantially linearly in, for example, a first direction. The first direction is a direction that has a component in a predetermined direction and is inclined with respect to the predetermined direction. 【0043】 The inner surface 62 (the second inner surface of the present invention; see the thick line in Figure 4) is a surface that extends at least along the axial direction. The inner surface 62 is one of the surfaces for press-fitting the spring hole member 70 into the housing space S. The inner surface 62 extends in the axial direction from the position where the end surface 54b is formed to the position where the bottom surface 66 is formed. As shown in Figure 4, when viewed from the axial direction, the inner surface 62 is located on the other side of the virtual straight line LA in the orthogonal direction. In other words, the inner surface 62 is located on the opposite side of the inner surface 61 across the virtual straight line LA in the orthogonal direction. When viewed from the axial direction, the inner surface 62 extends substantially linearly in, for example, a second direction. The second direction is a direction that has a component in a predetermined direction and is inclined to the opposite side of the first direction with respect to the predetermined direction. 【0044】 In this embodiment, both the inner surface 61 and the inner surface 62 extend to the inner end of the outer cylinder portion 54 in the radial direction. As a result, the member housing portion 60 opens to the inside of the outer cylinder portion 54 in the radial direction. In other words, the housing space S faces the coil housing groove 56 in the radial direction. 【0045】 The inner surface 63 (the third inner surface of the present invention; see the thick line in Figure 4) is a surface that extends at least along the axial direction. The inner surface 63 is one of the surfaces for press-fitting the spring hole member 70 into the housing space S. The inner surface 63 extends in the axial direction from the position where the end surface 54b is formed to the position where the bottom surface 66 is formed. As shown in Figure 4, when viewed from the axial direction, the inner surface 63 extends at least in the orthogonal direction. The inner surface 63 faces at least one side in a predetermined direction (the inner side in the radial direction). When viewed from the axial direction, the inner surface 63 is curved, for example, along the circumferential direction of the outer cylinder portion 54. The inner surface 63 intersects (i.e., crosses) the virtual straight line LA. 【0046】 As shown in Figure 4, inner surface 61 faces the virtual line LA side in the orthogonal direction and the other side (inner surface 63 side) in a predetermined direction. Inner surface 62 also faces the virtual line LA side in the orthogonal direction and the other side (inner surface 63 side) in a predetermined direction. A more precise definition is as follows: When viewed from the axial direction, the point on inner surface 61 located at a predetermined first position in a predetermined direction is called point 61A. The point on inner surface 62 located at a predetermined first position in a predetermined direction is called point 62A. At the predetermined first position, the distance between inner surface 61 and inner surface 62 in the orthogonal direction (i.e., the shortest distance between point 61A and point 62A) is defined as distance D1. Similarly, when viewed from the axial direction, the point on inner surface 61 located at a predetermined second position in a predetermined direction is called point 61B. The second position is the position on the other side (inner surface 63 side) of the first position in a predetermined direction. Furthermore, the point on the inner surface 62 that is located at the second position in a predetermined direction is called point 62B. At the second position in the predetermined direction, the distance between the inner surface 61 and the inner surface 62 in the orthogonal direction (i.e., the shortest distance between point 61B and point 62B) is defined as distance D2. In this case, distance D2 is longer than distance D1. 【0047】 The inner surface 64 is located between the inner surface 61 and the inner surface 63 and is the surface connecting the inner surface 61 and the inner surface 63. Like the inner surface 61 and the inner surface 63, the inner surface 64 extends along the axial direction. The inner surface 64 may be curved, for example, so as to be convex outward in the radial direction. The inner surface 65 is located between the inner surface 62 and the inner surface 63 and is the surface connecting the inner surface 62 and the inner surface 63. Like the inner surface 62 and the inner surface 63, the inner surface 65 extends along the axial direction. The inner surface 65 may be curved, for example, so as to be convex outward in the radial direction. 【0048】 The bottom surface 66 is the surface that contacts the end surface 80 (described later) of the spring hole member 70. The bottom surface 66 faces the other side in the axial direction. The bottom surface 66 is connected to one end of the inner surfaces 61-65 in the axial direction. The two positioning holes 67 are holes through which the two positioning protrusions 81 (described later) of the spring hole member 70 are inserted. The bottom surface 68 is a surface located on one side of the bottom surface 66 in a predetermined direction and on one side in the axial direction. The stepped surface 69 extends in the axial direction and is a surface that connects the bottom surface 66 and the bottom surface 68 (see Figures 3(a) to 4). 【0049】 Other member housing sections 60 (member housing sections 60B and 60C; see Figure 3(a)) have the same structure as member housing section 60A, except for their orientation. In member housing section 60B, when viewed from the axial direction, a virtual line LB defines a predetermined direction and an orthogonal direction. In member housing section 60C, when viewed from the axial direction, a virtual line LC defines a predetermined direction and an orthogonal direction. Both virtual line LB and virtual line LC extend in a direction parallel to the radial direction. 【0050】 Next, the structure of the spring hole member 70 will be described with reference to Figures 5 to 8. Figure 5 is a view of the yoke 51 and the multiple spring hole members 70 from the axial direction. Figure 6(a) is a perspective view of the spring hole member 70 from at least the other side in the axial direction. Figure 6(b) is a view of the spring hole member 70 from the other side in the axial direction. Figure 6(c) is a perspective view of the spring hole member 70 from at least one side in the axial direction. Figure 6(d) is a view of the spring hole member 70 from one side in the axial direction. Figure 7(a) is a perspective view of the yoke 51 and the multiple spring hole members 70, including a cutaway cross-sectional view of a part of the yoke 51 and a part of the multiple spring hole members 70. Figure 7(b) is an enlarged view of a part (region R) of Figure 7(a). Figure 8 is an enlarged view of a part of Figure 5. 【0051】 As shown in Figure 5, the spring hole member 70 is a member placed in a housing space S formed by the member housing portion 60. The density of the material of the spring hole member 70 is lower than the density of the material of the yoke 51. The material of the spring hole member 70 is, for example, a resin material. As shown in Figures 6(a) to 8, the spring hole member 70 has outer surfaces 71, 72, 73, 74, 75, 76, an end face 77, two spring holes 78, two slits 79, an end face 80, two positioning protrusions 81, and a projection 82. 【0052】 The outer surfaces 71-76 are surfaces that extend along the axial direction. As shown in Figure 8, the outer surface 71 (the first outer surface of the present invention) is positioned to be in contact with the inner surface 61 of the member housing section 60. The outer surface 71 is positioned substantially parallel to the inner surface 61. The outer surface 72 (the second outer surface of the present invention) is positioned to be in contact with the inner surface 62 of the member housing section 60. The outer surface 72 is positioned substantially parallel to the inner surface 62. The outer surface 73 (the third outer surface of the present invention) is positioned to be in contact with the inner surface 63 of the member housing section 60. The outer surface 73 is divided into outer surfaces 73M, 73L, and 73R by two slits 79. The outer surface 73M is positioned between outer surfaces 73L and 73R in an orthogonal direction. The outer surface 74 is positioned opposite the inner surface 64 of the member housing section 60. The outer surface 74 is, for example, spaced apart from the inner surface 64. The outer surface 75 is positioned opposite the inner surface 65 of the member housing portion 60. The outer surface 75 is, for example, spaced apart from the inner surface 65. The outer surface 76 is a curved surface positioned in approximately the same location as the inner circumferential surface 54a of the outer cylinder portion 54 in the radial direction. The outer surface 76 faces the coil housing groove 56. 【0053】 As shown in Figures 6(a) and 6(b), the end face 77 is a surface located at the other end of the spring hole member 70 in the axial direction. The end face 77 is located in approximately the same position as the end face 54b of the outer cylinder portion 54 in the axial direction. Each of the two spring holes 78 is the same hole as the spring hole 57 described above. For convenience of explanation, the two spring holes 78 will be called spring holes 78L and 78R, respectively. Each of the two slits 79 is a slit formed in the outer surface 73. Each of the two slits 79 is positioned to extend over the entire axial area of ​​the outer surface 73. The two slits 79 will be called slits 79L and 79R, respectively. Slit 79L is positioned to be sandwiched between the spring hole 78L and the inner surface 63 of the member housing portion 60 in a predetermined direction. Being sandwiched means that in a predetermined direction, slit 79L at least partially overlaps both the spring hole 78L and the inner surface 63. Similarly, the slit 79R is positioned to be sandwiched between the spring hole 78R and the inner surface 63 of the member housing portion 60 in a predetermined direction. 【0054】 As shown in Figures 6(c) and 6(d), the end face 80 is a surface located at one end of the spring hole member 70 in the axial direction. The end face 80 is in contact with the bottom surface 66 of the member housing 60. The two positioning protrusions 81 are portions that project from the end face 80 to one side in the axial direction. The two positioning protrusions 81 have a shape that surrounds the two spring holes 78 when viewed from the axial direction. The two positioning protrusions 81 are inserted through the two positioning holes 67, respectively. The projection 82 is a portion that projects from the end face 80 to one side in the axial direction. The projection 82 is located at the other end of the spring hole member 70 in a predetermined direction. The projection 82 is located so as to be in contact with the bottom surface 68 and the stepped surface 69 of the member housing 60. In other words, the projection 82 is located between the bottom surface 66 of the member housing 60 and the upper surface 55a of the disc portion 55 in both the axial and radial directions. 【0055】 The spring hole member 70 having the above configuration is press-fitted (housed) into the member housing section 60. As shown in Figure 8, the outer surface 71 of the spring hole member 70 press-fitted into the member housing section 60 is in contact with the inner surface 61 of the member housing section 60. Similarly, the outer surface 72 is in contact with the inner surface 62. The outer surface 73 (outer surfaces 73M, 73L, and 73R) is in contact with the inner surface 63. Furthermore, in the manufacturing process of the electromagnetic brake device 1, with the spring hole member 70 press-fitted into the member housing section 60 and the coil 52 housed in the coil housing groove 56, a liquid hardening material is filled into the coil housing groove 56. At this time, the hardening material also comes into contact with the outer surface 76 facing the coil housing groove 56. At this time, the outer surfaces 71 and 72 are in contact with the inner surfaces 61 and 62, respectively, and the protruding portion 82 is in contact with the bottom surface 68 and the stepped surface 69 of the member housing section 60 (see Figure 7(b)). This closes the opening of the member housing section 60. Therefore, the intrusion of the liquid curing material into the housing space S is suppressed. Subsequently, as the curing material is heated and hardened, the spring hole member 70 is fixed to the curing member 58 via the outer surface 76. 【0056】 (Force applied to the spring hole member) Next, the force applied to the spring hole member 70 when it is heated will be explained with reference to Figure 8. 【0057】 When current flows through coil 52, the temperature of coil 52 (and yoke 51) rises due to Joule heating. As Joule heat is conducted to the spring hole member 70, the temperature of the spring hole member 70 also rises. At this time, the spring hole member 70 expands due to thermal expansion. The thermal expansion coefficient of the spring hole member 70 is greater than that of the yoke 51. Therefore, the thermal expansion of the spring hole member 70 is suppressed by the member housing portion 60. More specifically, according to the law of action and reaction, as shown by the arrows in Figure 8, the outer surface 71 of the spring hole member 70 is pushed back by the inner surface 61 of the member housing portion 60. Similarly, the outer surface 72 is pushed back by the inner surface 62. The outer surface 73 is pushed back by the inner surface 63. When such forces are applied to the spring hole member 70, internal stress is generated in the vicinity of the outer surface 73 of the spring hole member 70. 【0058】 If the slit 79 is not formed on the outer surface 73, internal stress tends to concentrate near the outer surface 73 and near the spring hole 78. This can lead to problems such as crack formation in the spring hole 78. On the other hand, in this embodiment, the slit 79 provides a release channel for internal stress, thus easing the internal stress near the outer surface 73 and near the spring hole 78. This suppresses the occurrence of cracks and other problems. 【0059】 As described above, the spring hole member 70 can be press-fitted into the member housing 60 such that the outer surface 71 of the spring hole member 70 contacts the inner surface 61 of the member housing 60, and the outer surface 72 of the spring hole member 70 contacts the inner surface 62 of the member housing 60. Furthermore, in this embodiment, when the spring hole member 70 expands due to Joule heating when the coil 52 is energized, the outer surface 73 of the spring hole member 70 is pushed back by the inner surface 63 of the member housing 60. At that time, internal stress is generated near the outer surface 73 and near the spring hole 78, but since a slit 79 is provided, a place for the internal stress to escape is formed, and the internal stress can be alleviated. Therefore, in the spring hole member 70 for reducing the weight of the outer cylinder portion 54, the occurrence of problems due to thermal expansion can be suppressed. 【0060】 Furthermore, when the spring hole member 70 is housed in the member housing section 60 and the coil 52 is housed in the coil housing groove 56, a portion of the hardening material comes into contact with the spring hole member 70 when the hardening material is poured into the coil housing groove 56. Subsequently, when the hardening material hardens, the spring hole member 70 can be fixed by the hardening material. Therefore, the spring hole member 70 can be attached even more stably. 【0061】 Furthermore, the protruding portion 82 prevents the hardening material from flowing into the gap between the member housing portion 60 and the spring hole member 70. 【0062】 Next, modified examples of the above embodiments will be described. However, components having the same configuration as the above embodiments will be denoted by the same reference numerals and their descriptions will be omitted as appropriate. 【0063】 Each modified example will be described with reference to Figures 9(a) to 11(c) as needed. Figures 9(a) to 11(b) are views of the yoke and multiple spring hole members (reference numerals omitted here) related to each modified example, as seen from the axial direction, similar to Figure 5. Figure 11(c) is a cross-sectional view similar to Figure 7(b). 【0064】 (1) When viewed from the axial direction, the slit 79 may extend from the outer surface 73 to the inner circumferential surface of the spring hole 78. 【0065】 (2) In the above embodiment, the outer surface 73 (outer surfaces 73M, 73L, and 73R) of the spring hole member 70 is in contact with the inner surface 63 of the member housing 60. However, this is not limited to this. Only a part of the outer surfaces 73M, 73L, and 73R may be in contact with the inner surface 63. For example, as shown in Figure 9(a), a spring hole member 70A may be provided instead of the spring hole member 70. In the spring hole member 70A, an outer surface 73AM may be provided instead of the outer surface 73M. The outer surface 73AM may be separated from the inner surface 63. 【0066】 Furthermore, as shown in Figure 9(b), for example, a spring hole member 70B may be provided instead of the spring hole member 70. In the spring hole member 70B, outer surfaces 73BL and 73BR may be provided instead of outer surfaces 73L and 73R. The outer surfaces 73BL and 73BR may be separated from the inner surface 63. Moreover, as shown in Figure 9(c), for example, a spring hole member 70B2 may be provided instead of the spring hole member 70B. In the spring hole member 70B2, outer surfaces 74B2 and 75B2 may be provided instead of outer surfaces 74 and 75. The outer surface 74B2 may be divided by a slit 83L that extends over the entire axial area of ​​the spring hole member 70B2. The outer surface 75B2 may be divided by a slit 83R similar to the slit 83L. 【0067】 (3) In the embodiments described above, an injection port 54e for injecting liquid hardening material into the coil housing groove 56 was provided in the outer cylinder portion 54. However, this is not the only way. The injection port 54e does not necessarily have to be provided. Alternatively, for example, as shown in Figure 10(a), a spring hole member 70C may be provided instead of the spring hole member 70. The spring hole member 70C may have an outer surface 76C instead of the outer surface 76. The outer surface 76C may have a recess 84 (the injection portion of the present invention) formed on the other side in a predetermined direction (i.e., the outer side in the radial direction). The recess 84 may be capable of guiding the liquid hardening material into the coil housing groove 56. This makes it possible to inject the hardening material into the coil housing groove 56 without forming an injection port 54e in the outer cylinder portion 54. Therefore, the effort required to process the outer cylinder portion 54 can be reduced. 【0068】 (4) In the embodiments described above, the outer surface 76 of the spring hole member 70 is positioned in approximately the same location as the inner circumferential surface 54a of the outer cylinder portion 54 in the radial direction. However, this is not the only option. For example, as shown in Figure 10(b), a spring hole member 70D may be provided instead of the spring hole member 70. The spring hole member 70D may have an outer surface 76D instead of the outer surface 76. The outer surface 76D may be located inward from the inner circumferential surface 54a of the outer cylinder portion 54 in the radial direction. In other words, the spring hole member 70D may have an extended portion 85 that extends inward from the inner circumferential surface 54a of the outer cylinder portion 54 in the radial direction. This allows the coil 52 to be caught by the extended portion 85 of the spring hole member 70D even if the coil 52 is about to come into contact with the inner circumferential surface 54a of the outer cylinder portion 54 during the manufacturing process of the electromagnetic brake device 1. This prevents contact between the coil 52 and the inner circumferential surface 54a. Therefore, the insulation between the coil 52 and the outer cylinder portion 54 can be effectively maintained. Also, in this case, the member housing portion 60 does not need to have a bottom surface 68. The bottom surface 66 may extend to the inner end of the member housing portion 60 in the radial direction. The protrusion 82 may extend radially inward from the bottom surface 66 and to one side in the axial direction. 【0069】 (5) In the embodiments described above, the outer surface 76 of the spring hole member 70 is assumed to face the coil housing groove 56. However, it is not limited to this. For example, as shown in Figure 10(c), a member housing portion 60E may be provided instead of the member housing portion 60. More specifically, an outer cylinder portion 54E may be provided instead of the outer cylinder portion 54. The outer cylinder portion 54E may have an inner circumferential surface 54Ea instead of an inner circumferential surface 54a. The member housing portion 60E may have inner surfaces 61E and 62E instead of inner surfaces 61 and 62. The inner surfaces 61E and 62E may be located radially outside the inner circumferential surface 54Ea. As a result, the member housing portion 60E may have an inner end wall 86 located at the inner end in the radial direction. Also, a spring hole member 70E may be provided instead of the spring hole member 70. The spring hole member 70E may have outer surfaces 71E, 72E, and 76E instead of outer surfaces 71, 72, and 76. The outer surfaces 71E, 72E, and 76E may be positioned radially outside the inner circumferential surface 54Ea. That is, the spring hole member 70E may be positioned to fit completely between the outer and inner ends of the outer cylinder portion 54E in the radial direction. In this case, during the manufacturing process of the electromagnetic brake device 1, the liquid hardening material is blocked by the inner end wall 86. Therefore, intrusion of the hardening material into the containment space S can be avoided. 【0070】 (6) In the embodiments described above, one side in a predetermined direction corresponds to the inside in the radial direction, and the other side in a predetermined direction corresponds to the outside in the radial direction. However, this is not limited to this. That is, one side in a predetermined direction may correspond to the outside in the radial direction, and the other side in a predetermined direction may correspond to the inside in the radial direction. As a specific example, as shown in Figure 11(a), a member housing portion 60F may be provided instead of the member housing portion 60. To define the predetermined direction and the orthogonal direction, a virtual line LA2 may be assumed instead of a virtual line LA. The virtual line LA2 may extend in a direction parallel to the radial direction. Roughly speaking, the orientation of the member housing portion 60F in the radial direction may be opposite to that of the member housing portion 60. Instead of the inner surface 61, an inner surface 61F may be provided that faces the opposite side of the inner surface 61 in the radial direction. Similarly, instead of the inner surfaces 62 and 63, inner surfaces 62F and 63F may be provided, respectively. Instead of the outer cylinder portion 54, an outer cylinder portion 54F may be provided. The outer cylinder portion 54F may have an inner circumferential surface 54Fa instead of an inner circumferential surface 54a. The outer cylinder portion 54F may have an outer circumferential surface 54Fg formed at the radially outer end of the outer cylinder portion 54F. The member housing portion 60F may open radially outward in the outer cylinder portion 54F. Also, a spring hole member 70F may be provided instead of the spring hole member 70. The spring hole member 70F may have outer surfaces 71F, 72F, and 73F instead of outer surfaces 71, 72, and 73. The spring hole member 70F may have an outer surface 76F instead of an outer surface 76. The outer surface 76F may be positioned approximately the same as the outer circumferential surface 54Fg in the radial direction. The spring hole member 70F may have a slit 79F instead of a slit 79. The slit 79F may be positioned between the spring hole 78 and the inner surface 63F in a predetermined direction. 【0071】 (7) The predetermined direction may be defined as a direction not parallel to the radial direction. For example, as shown in Figure 11(b), a member housing portion 60G may be provided instead of the member housing portion 60. To define the predetermined direction and the orthogonal direction, a virtual line LA3 may be assumed instead of a virtual line LA. The direction in which the virtual line LA3 extends may be a direction perpendicular to the virtual lines LA and LA2 described above. Of course, the direction in which the virtual line LA3 extends is not limited to this. The predetermined direction is a direction parallel to the virtual line LA3. Instead of the inner surfaces 61, 62 and 63, inner surfaces 61G, 62G and 63G may be provided, respectively. Instead of the outer cylinder portion 54, an outer cylinder portion 54G may be provided. The outer cylinder portion 54G may have an inner circumferential surface 54Ga instead of an inner circumferential surface 54a. The outer cylinder portion 54G may have an outer circumferential surface 54Gg formed at the outer end of the outer cylinder portion 54G in the radial direction. Alternatively, a spring hole member 70G may be provided instead of the spring hole member 70. The spring hole member 70G may have outer surfaces 71G, 72G, and 73G instead of outer surfaces 71, 72, and 73. The spring hole member 70G may have an outer surface 76G instead of outer surface 76. The spring hole member 70G may have only one spring hole 78. The spring hole member 70G may have a slit 79G instead of a slit 79. The slit 79G may be positioned so as to be sandwiched between the spring hole 78 and the inner surface 63G in a predetermined direction. 【0072】 (8) In the embodiments described above, the member housing portion 60 has a bottom surface 68 and a stepped surface 69. Also, the spring hole member 70 has a protrusion 82. However, it is not limited to these. For example, as shown in Figure 11(c), a member housing portion 60H may be provided instead of the member housing portion 60. An outer cylinder portion 54H may be provided instead of the outer cylinder portion 54. In the outer cylinder portion 54H, an inclined surface 68H may be provided instead of the bottom surface 68 and the stepped surface 69. The inclined surface 68H may face the other side in the axial direction and the inside in the radial direction. Also, a spring hole member 70H may be provided instead of the spring hole member 70. The spring hole member 70H may have a protrusion 82H instead of the protrusion 82. The protrusion 82H is located between the bottom surface 66 and the top surface 55a in both the axial and radial directions. The protrusion 82H is in contact with the inclined surface 68H. Even with this configuration, the intrusion of liquid hardening material into the containment space S during the manufacturing process of the electromagnetic brake device 1 is suppressed. 【0073】 (9) In the embodiments described above, the curing member 58 was made of a curing material which is a thermosetting resin material. However, it is not limited to this. The curing material may be made of a material other than a thermosetting resin material, as long as it can ensure insulation between the coil 52 and the yoke 51. Also, in the embodiments described above, the curing member 58 was filled into the coil housing groove 56. However, it is not limited to this. The curing member 58 does not have to be filled into the coil housing groove 56. 【0074】 (10) The number of spring holes 78 formed in each member housing section (60, etc.) is not limited to those described above. A member housing section 60, etc. may have only one spring hole 78. Alternatively, a member housing section 60, etc. may have three or more spring holes 78. It is preferable that one or more slits 79 are provided corresponding to each spring hole 78. 【0075】 (11) The spring hole members 70 and other spring hole members (hereinafter referred to as "spring hole members 70, etc.") may be colored. By making the colors of the spring hole members 70, etc. and the spring 6 significantly different from each other, it is possible to prevent forgetting to put the spring 6 into the spring hole 78 during the manufacture of the electromagnetic brake device 1. As a specific example of color, it is preferable that the spring hole members 70, etc. are colored red and the spring 6 is colored green, so that the color of the spring hole members 70 is the opposite color of the spring 6. 【0076】 (12) The number of springs 6 and bolts B provided in the electromagnetic brake device 1 is not limited to those described above. The number of springs 6 and bolts B shall be set appropriately according to the specifications of the electromagnetic brake device 1. [Explanation of symbols] 【0077】 1. Electromagnetic brake system 2 Rotating members 4. Movable plate (movable member) 5 Electromagnet Unit 6. Spring (spring component) 51 York 52 coils 53 Inner cylinder 54 Outer cylinder 54a Inner surface 55a Top surface (second bottom surface) 56 Coil housing groove 60 Member housing section 61. Inner self (First inner self) 62. Inner self (Second inner self) 63. Inner self (Third inner self) 66 Bottom (1st bottom) 70 Spring hole member 71 External surface (1st external surface) 72 External surface (second external surface) 73 External surface (3rd external surface) 78 spring holes 79 Slits 82 Protrusion 84 Recess (Injection area) 85 Extension LA virtual straight line

Claims

[Claim 1] An electromagnetic brake device for braking a rotating member that rotates with a predetermined axial direction as the rotation axis, A movable member is positioned adjacent to one side of the rotating member in the axial direction, configured to be movable in the axial direction, and brakes the rotation of the rotating member when in contact with the rotating member; A plurality of spring members that bias the movable member toward the other side in the axial direction, The movable member has a cylindrical inner cylinder portion extending in the axial direction and made of a magnetic material, and a cylindrical outer cylinder portion positioned outside the inner cylinder portion in the radial direction of the inner cylinder portion and made of a magnetic material, and a yoke positioned on one side of the movable member in the axial direction, A coil is positioned in the radial direction of the yoke, outside the inner cylinder and inside the outer cylinder, which generates a magnetic force between the movable member and the yoke when current is flowing. The device comprises a spring hole member housed in the outer cylinder portion, arranged to extend in the axial direction, and configured to house at least one of the plurality of spring members, made of a material with a higher coefficient of thermal expansion and lower density than the material of the yoke, The outer cylinder portion has a member housing portion in which a housing space for housing the spring hole member is formed, The member housing section is, When viewed from the axial direction, a first inner surface extends in a first direction inclined with respect to a predetermined direction in which a predetermined virtual straight line passing through the housing space extends, and is located on one side of the virtual straight line in an orthogonal direction perpendicular to the predetermined direction, When viewed from the axial direction, a second inner surface extends in a second direction that is inclined to the opposite side of the first direction with respect to the predetermined direction, and is located on the other side of the virtual straight line in the orthogonal direction, It has a third inner surface that extends in a direction intersecting both the first and second directions when viewed from the axial direction, and is arranged to intersect with the virtual straight line, The first inner surface faces the second inner surface side in the orthogonal direction and the third inner surface side in the predetermined direction. The second inner surface faces the first inner surface side in the orthogonal direction and the third inner surface side in the predetermined direction, The spring hole member is, An electromagnetic brake device characterized by having: a spring hole that penetrates the spring hole member in the axial direction and is configured to accommodate one of the plurality of spring members; a first outer surface arranged to contact the first inner surface; a second outer surface arranged to contact the second inner surface; a third outer surface arranged to contact the third inner surface; and a slit provided on the portion of the third outer surface that is sandwiched between the spring hole and the third inner surface in the predetermined direction, and that extends over the entire area of ​​the third outer surface in the axial direction. [Claim 2] The third inner surface is arranged to face inward in the radial direction at least, The member housing portion opens to the inside of the outer cylinder in the radial direction, as the first inner surface and the second inner surface extend to the inner end of the outer cylinder in the radial direction. The yoke has a coil housing groove in which the coil is housed, The electromagnetic brake device according to claim 1, characterized in that an insulating curing material is filled into the coil housing groove. [Claim 3] The member housing portion has a first bottom surface facing the other side in the axial direction, The coil housing groove is It has a second bottom surface that faces the other side in the axial direction and is positioned to the side of the first bottom surface in the axial direction, The spring hole member is, The electromagnetic brake device according to claim 2, characterized in that it has a projection that is disposed between the first bottom surface and the second bottom surface in both the axial and radial directions, and that protrudes at least to one side in the axial direction. [Claim 4] The electromagnetic brake device according to claim 2 or 3, characterized in that it has an injection portion provided at the inner end of the spring hole member in the radial direction for injecting the liquid hardening material into the coil housing groove. [Claim 5] The spring hole member is, An electromagnetic brake device according to any one of claims 1 to 3, characterized in that it has an extended portion made of an insulating material that extends inward in the radial direction beyond the inner circumferential surface of the outer cylinder portion.

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