Electromagnetic actuator

Abstract

A clutch housing (20) houses a clutch unit (130) therein. A movable core (32) is provided outside the clutch housing (20). An electromagnetic coil (33) can drive the clutch unit (130) by using electromagnetic force to drive the movable core (32). An actuator housing (31) houses the movable core (32) and the electromagnetic coil (33). On the radially inner side of a specific end surface (310) with respect to an outermost diameter section (G1), the specific end surface (310) being the end surface on the clutch housing (20) side in the axial direction of the actuator housing (31), bolts (91) are provided such that one end thereof is joined to the specific end surface (310). Nuts (92) is screwed onto the other end of the bolts (91) and can fix the actuator housing (31) and the clutch housing (20) in a state in which the clutch housing (20) is sandwiched between the nuts (92) and the specific end surface (310).

Description

Electromagnetic actuator Cross-reference to related applications 【0001】 This application is based on Japanese Patent Application No. 2024-213797 filed on Dec. 6, 2024, the contents of which are incorporated herein by reference. 【0002】 The present disclosure relates to an electromagnetic actuator. 【0003】 Conventionally, an electromagnetic actuator including an electromagnetic coil capable of driving a driven part such as a clutch has been known. For example, in the electromagnetic actuator of Patent Document 1, a flange is provided on the housing of a solenoid having an electromagnetic coil, and the solenoid is fixed to the housing by fixing the flange to the housing that houses the driven part or the like with bolts or the like. 【0004】 U.S. Patent Application Publication No. 2014 / 0342874 【0005】 In the electromagnetic actuator of Patent Document 1, the flange of the solenoid is formed so as to extend radially outward from the axial end of the cylindrical housing. Therefore, there is a risk that the physical size of the electromagnetic actuator in the radial direction of the solenoid will increase. 【0006】 An object of the present disclosure is to provide a compact electromagnetic actuator. 【0007】 The electromagnetic actuator according to the present disclosure includes a driven part, a first housing, a movable core, an electromagnetic coil, a second housing, a bolt, and a nut. The first housing houses the driven part inside. The movable core is provided outside the first housing. The electromagnetic coil can drive the driven part by driving the movable core by electromagnetic force. The second housing houses the movable core and the electromagnetic coil. 【0008】 The bolt is provided such that one end thereof is joined to a specific end face, which is the outermost diameter portion of a specific end face on the first housing side in the axial direction of the second housing, on the radially inner side. The nut can fix the second housing and the first housing in a state where the first housing is sandwiched between the nut and the specific end face by screwing the nut to the other end of the bolt. 【0009】In this disclosure, the bolts that secure the second housing and the first housing are positioned radially inward relative to the outermost diameter portion of a specific end face. As a result, the size of the electromagnetic actuator in the radial direction of the second housing can be reduced. 【0010】 The above-mentioned and other purposes, features and advantages of this disclosure will become clearer from the following detailed description with reference to the accompanying drawings. The drawings are as follows: Figure 1 is a schematic diagram showing an electromagnetic actuator according to a first embodiment and a vehicle to which it is applied; Figure 2 is a cross-sectional view showing an electromagnetic actuator according to a first embodiment; Figure 3 is a cross-sectional view taken along line III-III in Figure 2; and Figure 4 is a cross-sectional view showing an electromagnetic actuator according to a second embodiment. 【0011】 The following describes electromagnetic actuators according to multiple embodiments, based on the drawings. In addition, substantially identical components in multiple embodiments are denoted by the same reference numerals, and their descriptions are omitted. 【0012】 (First Embodiment) Figure 1 shows an electromagnetic actuator according to the first embodiment and a vehicle to which it is applied. The clutch device 10, which is an "electromagnetic actuator," is mounted on a vehicle 1 such as an electric vehicle. 【0013】 Vehicle 1 is equipped with a motor generator 2, a reduction gear 17, a differential 9, a differential shaft 11, an axle case 16, a clutch device 10, a wheel shaft 12, a wheel 13, a wheel shaft 14, a wheel 15, and an electronic control unit (hereinafter referred to as "ECU") 100 as a "control unit". 【0014】 The motor generator 2 is used as a drive source for the vehicle 1 and can output torque when energized. The motor generator 2 can generate electricity through regenerative operation. The reduction gear 17 can reduce the torque from the motor generator 2. The differential 9 is a differential gear that distributes the torque from the reduction gear 17 to the wheels 13 and 15. The clutch device 10 is installed between the differential 9 and the wheels 13 and is used to allow or interrupt the transmission of torque between the differential 9 and the wheels 13. 【0015】More specifically, the reduction gear 17 includes a first gear shaft 3, a second gear shaft 4, a first small-diameter gear 5, a first large-diameter gear 6, a second small-diameter gear 7, and a second large-diameter gear 8. The first gear shaft 3 is connected to the motor generator 2 and is rotatable in conjunction with the rotation of the motor generator 2. The first small-diameter gear 5 is mounted coaxially with the first gear shaft 3 so as to be rotatable in conjunction with the first gear shaft 3. The second gear shaft 4 is mounted parallel to the first gear shaft 3. The first large-diameter gear 6 has a larger outer diameter than the first small-diameter gear 5, is rotatable with the first small-diameter gear 5, and is mounted coaxially with the second gear shaft 4 so as to be rotatable in conjunction with the second gear shaft 4. The second small-diameter gear 7 has a smaller outer diameter than the first large-diameter gear 6 and is mounted coaxially with the second gear shaft 4 so that it can rotate integrally with the second gear shaft 4. The second large-diameter gear 8 has a smaller outer diameter than the second small-diameter gear 7 and is mounted so that it can mesh with the second small-diameter gear 7. With this configuration, the torque from the motor generator 2 is reduced by the reduction gear 17 and output from the second large-diameter gear 8. 【0016】 Here, "coaxial" does not refer only to a state where the axes of both are strictly aligned, but also includes states where they slightly intersect within the limits of errors or common technical knowledge, and states where they are approximately parallel (the same applies hereinafter). 【0017】 The differential 9 is configured to connect to the second large-diameter gear 8. One end of the differential shaft 11 is configured to connect to the differential 9. 【0018】 The axle case 16 is formed to accommodate, for example, a motor generator 2, a reduction gear 17, a differential 9, a differential shaft 11, etc., and is provided on the vehicle 1. 【0019】 The clutch device 10 is mounted on the axle case 16. The first transmission unit 110 (described later) of the clutch device 10 is connected to the other end of the differential shaft 11. The second transmission unit 120 (described later) of the clutch device 10 is connected to one end of the wheel shaft 12. The other end of the wheel shaft 12 is connected to the wheel 13. Here, the wheel 13 is, for example, the rear left wheel of the vehicle 1. 【0020】One end of the wheel shaft 14 is connected to the differential 9. The other end of the wheel shaft 14 is connected to the wheel 15. Here, the wheel 15 is, for example, the rear right wheel of the vehicle 1. 【0021】 With the above configuration, when the clutch device 10 allows torque transmission between the first transmission unit 110 connected to the differential shaft 11 and the second transmission unit 120 connected to the wheel shaft 12, torque transmission between the motor generator 2 and the wheels 13 and 15 is permitted, allowing the vehicle 1 to run or the motor generator 2 to perform regenerative operation. 【0022】 The ECU 100 is a small computer having a CPU as a calculation means, ROM, RAM, etc. as storage means, and I / O as input / output means. Based on information such as signals from various sensors installed in various parts of the vehicle 1, the ECU 100 performs calculations according to a program stored in the ROM, etc., and controls the operation of various devices and equipment of the vehicle 1. In this way, the ECU 100 executes a program stored in a non-transitional physical recording medium. When this program is executed, the method corresponding to the program is executed. 【0023】 The ECU 100 can control the operation of the motor generator 2 based on information such as signals from various sensors. Furthermore, the ECU 100 can control the operation of the clutch device 10 by controlling the operation of the actuator 30, which will be described later. 【0024】 As shown in Figures 2 and 3, the clutch device 10 includes a clutch housing 20 as the "first housing", an actuator 30, a diaphragm 40, a fork 50, a fork support 501, a clutch section 130 as the "driven section", a first transmission section 110, a second transmission section 120, a connecting section 80, a bolt 91, a nut 92, a sealing member 93, and the like. 【0025】The clutch housing 20 includes a clutch housing cylindrical portion 21, a clutch housing bottom portion 22, a housing extension portion 23, a bolt hole portion 24, a clutch housing hole portion 201 as a "first housing hole portion", an extension cylindrical portion 202, etc. The clutch housing cylindrical portion 21 is formed in a cylindrical shape, for example, from metal. The clutch housing bottom portion 22 is formed integrally with the clutch housing cylindrical portion 21 so as to close one end of the clutch housing cylindrical portion 21. The housing extension portion 23 is formed to extend inward from the inner circumferential wall of the clutch housing cylindrical portion 21 on the clutch housing bottom portion 22 side. Two housing extension portions 23 are formed on the inner circumferential wall of the clutch housing cylindrical portion 21 so as to face each other. An extension portion end face 231 is formed on the side of the housing extension portion 23 opposite to the clutch housing bottom portion 22. The bolt hole portion 24 is formed to connect the side of the clutch housing bottom portion 22 opposite to the housing extension portion 23 and the extension portion end face 231 (see Figure 3). Here, the extended end face 231 and the opening of the bolt hole 24 in the extended end face 231 are located inside the clutch housing 20. 【0026】 The clutch housing hole 201 is formed in the clutch housing bottom 22 so as to connect the inside and outside of the clutch housing 20. The clutch housing hole 201 is formed between the two housing extensions 23. The extension cylinder 202 is formed integrally with the clutch housing bottom 22 so as to extend cylindrically from the clutch housing bottom 22 to the opposite side of the clutch housing cylinder 21. Here, the space inside the extension cylinder 202 is in communication with the space inside the clutch housing cylinder 21. An annular oil seal 102 is provided on the inside of the end of the extension cylinder 202 opposite to the end that connects to the clutch housing bottom 22. 【0027】A housing seal member 101 is provided on the side of the clutch housing cylinder 21 opposite to the clutch housing bottom 22. The housing seal member 101 is formed in an annular shape, for example, from rubber. When the clutch device 10 is attached to the axle case 16, the clutch housing 20 is fixed to the axle case 16 by bolts (not shown) with the side of the clutch housing cylinder 21 opposite to the clutch housing bottom 22 in contact with the outer wall of the axle case 16. At this time, the housing seal member 101 is compressed between the clutch housing 20 and the outer wall of the axle case 16. This makes it possible to maintain an airtight or liquid-tight seal between the clutch housing 20 and the axle case 16. In this embodiment, when the clutch device 10 is attached to the axle case 16, a lubricant is contained inside the clutch housing 20. Here, the lubricant is, for example, lubricating oil. This allows the clutch part 130 and other parts contained inside the clutch housing 20 to be lubricated. 【0028】 The actuator 30 is, for example, a solenoid. The actuator 30 includes an actuator housing 31 as a "second housing", a movable core 32, an electromagnetic coil 33, a shaft 34, a fixed core 35, a spring 36, etc. 【0029】The actuator housing 31 includes an actuator housing cylindrical portion 311, an actuator housing plate portion 312, an actuator housing plate portion 313, and an actuator housing hole portion 301 as a "second housing hole portion". The actuator housing cylindrical portion 311, the actuator housing plate portion 312, and the actuator housing plate portion 313 are formed of, for example, a magnetic material. The actuator housing cylindrical portion 311 is formed in a substantially cylindrical shape. The actuator housing plate portion 312 is formed integrally with the actuator housing cylindrical portion 311 so as to close one end of the actuator housing cylindrical portion 311. The actuator housing plate portion 313 is provided so as to close the other end of the actuator housing cylindrical portion 311. The actuator housing hole portion 301 is formed in the actuator housing plate portion 312 so as to communicate the inside and outside of the actuator housing 31. 【0030】 The movable core 32 is formed in a substantially cylindrical shape from, for example, a magnetic material. The movable core 32 is housed in the actuator housing 31 and is provided to reciprocate axially inside the actuator housing 31. The electromagnetic coil 33 is, for example, a cylindrical coil and is housed in the actuator housing 31. The shaft 34 is formed in a rod shape from, for example, metal, with one end's outer circumferential wall joined to the inner circumferential wall of the movable core 32 and the other end positioned radially inward of the actuator housing hole 301. The fixed core 35 is formed in a substantially cylindrical shape from, for example, a magnetic material. The fixed core 35 is housed in the actuator housing 31 and is fixed to the actuator housing 31 such that one end face faces the end face of the movable core 32 and the other end face abuts against the actuator housing plate portion 312. The spring 36 is, for example, a coil spring and is provided between the movable core 32 and the fixed core 35 on the radially outer side of the shaft 34. The spring 36 biases the movable core 32 toward the actuator housing plate portion 313. 【0031】The actuator 30 is mounted to the clutch housing 20 with the end of the shaft 34 opposite to the movable core 32 positioned radially inward of the clutch housing hole 201, and the actuator housing plate 312 of the actuator housing 31 in contact with the clutch housing bottom 22 of the clutch housing 20. As a result, the end of the shaft 34 opposite to the movable core 32 is located inside the clutch housing 20. The mounting of the actuator 30 to the clutch housing 20 will be described in detail later. 【0032】 When the electromagnetic coil 33 is energized, magnetic flux flows through the fixed core 35, actuator housing 31, and movable core 32, creating a magnetic attraction between the fixed core 35 and the movable core 32. As a result, the movable core 32 moves toward the fixed core 35, resisting the biasing force of the spring 36. 【0033】 The fork 50 includes a fork body 51, an engaging portion 52, a pad 54, etc. The fork body 51 is formed in a substantially arc shape, for example, from metal. The engaging portion 52 is formed integrally with the fork body 51 so as to connect to the center of the outer edge of the arc-shaped fork body 51. The engaging portion 52 has a hole 53. The hole 53 is formed to be recessed radially inward from the arc-shaped fork body 51 (see Figure 2). The pad 54 is provided at both ends of the arc-shaped fork body 51 so as to be rotatable relative to the fork body 51. 【0034】 The fork support portion 501 is formed in the shape of a cylindrical pin, for example, from metal. The fork support portion 501 is provided on the clutch housing 20 so that its tip fits into a fork support hole portion 55 formed in the fork body 51. As shown in Figure 3, two fork support portions 501 are provided so that their tips face each other on either side of the fork body 51. The fork 50 is supported by the fork support portions 501 so that it can rotate relative to the clutch housing 20. 【0035】The first transmission section 110 has a cylindrical end on the side opposite to the differential shaft 11. The second transmission section 120 is cylindrical, with one end located radially inward of the first transmission section 110 and the other end located radially inward of the extension cylindrical section 202. One end of the second transmission section 120 is supported by a bearing 103 provided on the inner circumferential wall of the first transmission section 110, and the other end is supported by a bearing 104 provided on the inner circumferential wall of the extension cylindrical section 202 (see Figure 2). 【0036】 As shown in Figure 2, the clutch section 130 has a fixed clutch 60 and a movable clutch 70. The fixed clutch 60 is made of, for example, metal and has a fixed clutch plate 62 and fixed dog teeth 63. The fixed clutch plate 62 is formed in an annular plate shape so as to extend radially outward from the outer peripheral wall of the second transmission section 120. The fixed dog teeth 63 are formed so as to extend radially while protruding from one surface of the fixed clutch plate 62. 【0037】 The movable clutch 70 is made of, for example, metal and has a movable clutch cylinder portion 71, a movable clutch plate portion 72, movable dog teeth 73, and a clutch groove portion 74. The movable clutch cylinder portion 71 is formed in a cylindrical shape. The movable clutch plate portion 72 is formed in an annular plate shape so as to extend radially outward from the outer peripheral wall of one end of the movable clutch cylinder portion 71. The movable dog teeth 73 are formed so as to extend radially while protruding from one surface of the movable clutch plate portion 72. The clutch groove portion 74 is formed in an annular shape so as to be recessed radially inward from the outer peripheral wall of the movable clutch cylinder portion 71. 【0038】The movable clutch 70 is spline-coupled to the first transmission unit 110 by spline teeth formed on the inner circumferential wall of the movable clutch cylinder 71 engaging with spline teeth formed on the outer circumferential wall of the first transmission unit 110. Therefore, the movable clutch 70 cannot rotate relative to the first transmission unit 110, but can move relative to it in the axial direction. By moving the movable clutch 70 toward the fixed clutch 60, the movable dog teeth 73 can engage with the fixed dog teeth 63. The pad 54 of the fork 50 is located in the clutch groove 74. The pad 54 is rotatable relative to the fork body 51 while located in the clutch groove 74. 【0039】 As shown in Figure 2, the connecting portion 80 has a connecting portion body 81 and an engaging portion 82. The connecting portion body 81 is formed in a rod shape, for example, from metal. One end of the connecting portion body 81 is formed in a cylindrical shape, and a screw groove is formed on the inner circumferential wall. The connecting portion body 81 has a spherical inner wall 811 and an opening 812. The spherical inner wall 811 is formed in a spherical shape at the other end of the connecting portion body 81. The opening 812 is formed to connect the space inside the spherical inner wall 811 with the space outside it. The opening 812 is formed in a direction perpendicular to the axis of the connecting portion body 81 with respect to the center of the spherical inner wall 811. 【0040】 The engaging portion 82 is formed in a rod shape, for example, from metal. The engaging portion 82 has a spherical portion 83, a flange portion 84, and a cylindrical portion 85. The spherical portion 83 is formed spherically at one end of the engaging portion 82. The cylindrical portion 85 is formed in a solid cylindrical shape at the other end of the engaging portion 82. The flange portion 84 is formed annularly so as to extend radially outward on the spherical portion 83 side relative to the cylindrical portion 85 of the engaging portion 82. 【0041】 The outer diameter of the spherical portion 83 is slightly smaller than the inner diameter of the spherical inner wall 811 of the connecting portion body 81. The engaging portion 82 is provided so that the spherical portion 83 fits into the spherical inner wall 811 of the connecting portion body 81. As a result, the engaging portion 82 is pivotable relative to the connecting portion body 81 with respect to the spherical portion 83. 【0042】The connecting portion 80 is integrally provided with the shaft 34 of the actuator 30 such that the thread groove on the inner circumferential wall of one end of the connecting portion body 81 engages with the thread formed on the end of the shaft 34 opposite to the movable core 32 of the actuator 30. As a result, the shaft 34 and the connecting portion body 81 of the connecting portion 80 are configured so that they cannot move relative to each other in the axial direction of the shaft 34. The cylindrical portion 85, which is the other end of the engaging portion 82 of the connecting portion 80, is fitted, i.e., engaged, with the hole 53 of the engaged portion 52 of the fork 50. The outer diameter of the cylindrical portion 85 of the engaging portion 82 is slightly smaller than the inner diameter of the hole 53. Therefore, the engaging portion 82 is axially movable relative to the engaged portion 52 while the outer circumferential wall of the cylindrical portion 85 slides against the inner circumferential wall of the hole 53 of the engaged portion 52. 【0043】 Figure 2 shows the state when the electromagnetic coil 33 of the actuator 30 is not energized. When the electromagnetic coil 33 is energized, the movable core 32 moves toward the fixed core 35 against the biasing force of the spring 36. As a result, the shaft 34 and the connecting part body 81 of the connecting part 80 move toward the opposite side from the actuator housing plate 313, i.e., toward the axle case 16. As a result, the driving force of the actuator 30 is transmitted from the shaft 34 through the connecting part 80 to the engaged part 52 of the fork 50, and the fork body 51 rotates around the fork support part 501. As a result, the pad 54 located in the clutch groove 74 moves toward the fixed clutch 60, and the movable dog teeth 73 engage with the fixed dog teeth 63. When the movable clutch 70 engages with the fixed clutch 60 by the engagement of the movable dog teeth 73 with the fixed dog teeth 63, torque transmission between the first transmission part 110 and the second transmission part 120 is permitted. 【0044】When the energization of the electromagnetic coil 33 is stopped with the movable dog tooth 73 meshed with the fixed dog tooth 63, the movable core 32 moves to the side opposite to the fixed core 35 by the biasing force of the spring 36. As a result, the shaft 34 and the connecting portion main body 81 of the connecting portion 80 move to the side of the actuator housing plate portion 313, that is, the side opposite to the axle case 16. Thereby, the fork main body 51 rotates about the fork support portion 501. As a result, the pad 54 located in the clutch groove portion 74 moves to the side opposite to the fixed clutch 60, and the meshing of the movable dog tooth 73 and the fixed dog tooth 63 is released. When the meshing of the movable dog tooth 73 and the fixed dog tooth 63 is released, and the engagement between the movable clutch 70 and the fixed clutch 60 is released, the torque transmission between the first transmission portion 110 and the second transmission portion 120 is interrupted. Thus, the fork 50 swings about the fork support portion 501 by the driving force of the actuator 30, that is, by the operation of the actuator 30. 【0045】 Next, the attachment of the actuator 30 to the clutch housing 20 and the like will be described. 【0046】 As shown in FIG. 3, the bolt 91 is formed in a rod shape, for example, of metal. A circular specific end face 310 is formed on the end face on the clutch housing 20 side in the axial direction of the actuator housing 31, that is, the end face of the actuator housing plate portion 312 on the side opposite to the actuator housing plate portion 313. The bolt 91 is provided such that one end thereof joins the specific end face 310 on the radially inner side with respect to the outermost diameter portion G1 of the specific end face 310. Here, one end of the bolt 91 is joined to the specific end face 310 by, for example, welding. Two bolts 91 are provided so as to join the outer edge portion of the specific end face 310. Two bolts 91 are provided at equal intervals in the circumferential direction of the specific end face 310. 【0047】The two bolts 91 are respectively inserted through the bolt holes 24 of the two housing extension parts 23 formed on the inner peripheral wall of the clutch housing cylinder part 21. A thread groove (thread crest) is formed on the outer peripheral wall of the other end side of the bolt 91. The other end of the bolt 91 protrudes from the extension part end face 231 of the housing extension part 23. That is, the other end of the bolt 91 is located inside the clutch housing 20. 【0048】 The nut 92 is, for example, a socket nut and is provided to be screwed onto the other end of the bolt 91. Thereby, the nut 92 can fix the actuator housing 31 and the clutch housing 20 in a state where the housing extension part 23 of the clutch housing 20 is sandwiched between the nut 92 and the specific end face 310. 【0049】 The seal member 93 is, for example, an annular washer made of metal or an annular O-ring made of rubber, and is provided between the nut 92 and the extension part end face 231 on the radially outer side of the other end of the bolt 91. Thereby, it is possible to keep the space between the nut 92 and the extension part end face 231 airtight or liquidtight, and suppress the leakage of the lubricant inside the clutch housing 20 to the outside through the bolt hole 24. 【0050】 The diaphragm 40 is formed in an annular film shape by an elastic material such as rubber. The diaphragm 40 is provided between the clutch housing hole 201 and the actuator housing hole 301 on the radially outer side of the shaft 34, and can seal the spaces on both axial sides of the shaft 34 and the inside and outside of the clutch housing 20, that is, keep them airtight or liquidtight. Here, the outer edge part of the diaphragm 40 is sandwiched between the outer edge part of the clutch housing hole 201 and the specific end face 310, and the inner edge part is provided to fit into an annular groove formed on the outer peripheral wall of the shaft 34. 【0051】As described above, in this embodiment, the clutch housing 20, which is the "first housing," houses the clutch unit 130, which is the "driven unit," inside. The movable core 32 is provided outside the clutch housing 20. The electromagnetic coil 33 can drive the clutch unit 130 by driving the movable core 32 with electromagnetic force. The actuator housing 31, which is the "second housing," houses the movable core 32 and the electromagnetic coil 33. 【0052】 The bolt 91 is positioned radially inward from the outermost diameter portion G1 of the specific end face 310, which is the end face of the actuator housing 31 on the clutch housing 20 side in the axial direction, with one end of the bolt 91 joining to the specific end face 310. The nut 92 is screwed onto the other end of the bolt 91, and the actuator housing 31 and the clutch housing 20 can be fixed together with the clutch housing 20 sandwiched between the specific end face 310 and the nut 92. 【0053】 In this embodiment, the bolts 91 that fix the actuator housing 31 and the clutch housing 20 are positioned radially inward relative to the outermost diameter portion G1 of a specific end face 310. Therefore, the size of the clutch device 10 as an "electromagnetic actuator" in the radial direction of the actuator housing 31 can be reduced. 【0054】 Furthermore, in this embodiment, multiple bolts 91 are provided on the outer edge of the specific end face 310. Therefore, the actuator housing 31 and the clutch housing 20 can be fixed more stably. 【0055】 Furthermore, in this embodiment, the other end of the bolt 91 is located inside the clutch housing 20. Therefore, space can be secured inside the clutch housing 20 for, for example, the connecting portion 80 and the end of the fork 50, and the size of the clutch housing 20 can be reduced. 【0056】 Furthermore, in this embodiment, the clutch housing 20 is capable of containing lubricant. This embodiment further includes a sealing member 93 provided at the other end of the bolt 91. This prevents lubricant from leaking out of the clutch housing 20. 【0057】 Furthermore, in this embodiment, the nut 92 is a cap nut, and the sealing member 93 is a washer or an O-ring. Therefore, leakage of lubricant from inside the clutch housing 20 can be suppressed even more effectively. 【0058】 Furthermore, in this embodiment, the clutch housing 20 has a clutch housing hole 201 as a "first housing hole" that connects the inside and outside. The actuator housing 31 has an actuator housing hole 301 as a "second housing hole" that connects the inside and outside. This embodiment further includes a shaft 34 and a diaphragm 40. The shaft 34 is provided such that one end is joined to the movable core 32 and the other end is located inside the actuator housing hole 301 and the clutch housing hole 201. The diaphragm 40 is provided between the clutch housing hole 201 and the actuator housing hole 301 on the radially outer side of the shaft 34, and is capable of sealing between the inside and outside of the clutch housing 20 and between the inside and outside of the actuator housing 31. Since one diaphragm 40 can seal between the inside and outside of the clutch housing 20 and between the inside and outside of the actuator housing 31, the number of components can be reduced and the size of the clutch device 10 can be made smaller. 【0059】 Furthermore, this embodiment further comprises a first transmission unit 110, a second transmission unit 120, and a fork 50. The second transmission unit 120 is provided so as to be rotatable relative to the first transmission unit 110. The fork 50 is driven by the drive of a movable core 32. The clutch unit 130, which is the "driven unit," has a fixed clutch 60 and a movable clutch 70. 【0060】The fixed clutch is fixed to the second transmission unit. The movable clutch 70 is provided so as to be axially relative to the first transmission unit 110 by the drive of the fork 50, and by engaging with the fixed clutch 60, it is possible to allow the transmission of torque between the first transmission unit 110 and the second transmission unit 120. As in this embodiment, by applying this disclosure to a clutch device of an electric vehicle (BEV), for example, it is possible to engage or disengage the axle of the electric vehicle and extend its driving range. In this embodiment, the clutch device 10 mounted on the electric vehicle can be made smaller. 【0061】 (Second Embodiment) Figure 4 shows an electromagnetic actuator according to the second embodiment. The second embodiment differs from the first embodiment in the configuration of the clutch housing 20 and bolts 91 as the "first housing". 【0062】 In this embodiment, the housing extension portion 23 is formed to extend inward from the inner circumferential wall of the clutch housing cylindrical portion 21, from the end of the clutch housing cylindrical portion 21 on the clutch housing bottom portion 22 side to the end on the opposite side of the clutch housing bottom portion 22. Therefore, the extension portion end face 231 is not formed inside the clutch housing 20, but is formed outside. Consequently, the other end of the bolt 91 is also located outside the clutch housing 20. 【0063】 In this embodiment, the other end of the bolt 91 is located outside the clutch housing 20. Therefore, there is no risk of the lubricant inside the clutch housing 20 leaking out through the bolt hole 24, and the sealing member 93 shown in the first embodiment can be omitted. 【0064】 As described above, in this embodiment, as in the first embodiment, the size of the clutch device 10 as an "electromagnetic actuator" in the radial direction of the actuator housing 31 can be reduced. In this embodiment, the sealing member 93 shown in the first embodiment can be omitted, thus reducing the number of components. 【0065】(Other Embodiments) In the above-described embodiment, an example was shown in which two bolts are provided on the outer edge of a specific end face. In contrast, in other embodiments, one bolt or three or more bolts may be provided on the specific end face. 【0066】 In other embodiments, the first housing may not contain a lubricant inside. In this case, a sealing member may not be provided at the other end of the bolt. 【0067】 In other embodiments, a diaphragm may not be provided. 【0068】 Furthermore, in the above-described embodiment, an example was shown in which the clutch device 10 is provided between the differential shaft 11 and the wheel shaft 12 to control the transmission of torque between the differential shaft 11 and the wheel shaft 12. In contrast, in another embodiment, for example, the first gear shaft 3 may be divided into two between the motor generator 2 and the first small-diameter gear 5, with one part connected to the first transmission unit 110 and the other part connected to the second transmission unit 120, and the clutch device 10 may be applied in this manner. In this case, the clutch device 10 can control the transmission of torque between the motor generator 2 and the first small-diameter gear 5. 【0069】 In another embodiment, for example, the second gear shaft 4 may be divided into two parts between the first large-diameter gear 6 and the second small-diameter gear 7, with one part connected to the first transmission unit 110 and the other part connected to the second transmission unit 120, and the clutch device 10 may be applied in this manner. In this case, the clutch device 10 can control the transmission of torque between the first large-diameter gear 6 and the second small-diameter gear 7. 【0070】 Furthermore, in the above-described embodiment, an example was shown in which the clutch device is used to control the transmission of torque between the motor generator and the rear wheels of the vehicle. In contrast, in another embodiment, the clutch device may be used to control the transmission of torque between the motor generator and the front wheels of the vehicle. 【0071】 Furthermore, this disclosure can be applied not only to electric vehicles, but also to vehicles that run on driving torque from an internal combustion engine, hybrid vehicles, and the like. 【0072】Furthermore, the above-described embodiment showed an example of an electromagnetic actuator as a clutch device having a fixed clutch and a movable clutch as the driven part. In contrast, in other embodiments, for example, the driven part may be the opening and closing part of a vehicle door, and the electromagnetic actuator may be a door opening and closing device. 【0073】(Disclosure of Technical Ideas) This specification discloses several technical ideas as described in the following paragraphs. Some paragraphs may be written in a multiple dependent form, where subsequent paragraphs optionally refer to preceding paragraphs. Furthermore, some paragraphs may be written in a multiple dependent form, where they refer to other multiple dependent forms. These paragraphs written in multiple dependent forms define several technical ideas. (Technical Concept 1) An electromagnetic actuator comprising: a driven part (130); a first housing (20) housing the driven part inside; a movable core (32) provided outside the first housing; an electromagnetic coil (33) capable of driving the driven part by driving the movable core with electromagnetic force; a second housing (31) housing the movable core and the electromagnetic coil; a bolt (91) provided radially inward from the outermost diameter portion (G1) of a specific end face (310), which is the end face of the second housing on the first housing side in the axial direction, with one end of the bolt joined to the specific end face; and a nut (92) that is screwed onto the other end of the bolt and capable of fixing the second housing and the first housing with the first housing sandwiched between it and the specific end face. (Technical Concept 2) The electromagnetic actuator according to Technical Concept 1, wherein a plurality of bolts are provided on the outer edge of the specific end face. (Technical Idea 3) The electromagnetic actuator according to technical idea 1 or 2, wherein the other end of the bolt is located inside the first housing. (Technical Idea 4) The electromagnetic actuator according to technical idea 3, wherein the first housing is capable of containing a lubricant and further comprises a sealing member (93) provided at the other end of the bolt. (Technical Idea 5) The electromagnetic actuator according to technical idea 4, wherein the nut is a cap nut and the sealing member is a washer or an O-ring.(Technical Concept 6) The electromagnetic actuator according to any one of Technical Concepts 1 to 5, further comprising: (Technical Concept 6) The first housing has a first housing hole (201) that communicates the inside and the outside; (Technical Concept 6) The first housing has a first housing hole (201) that communicates the inside and the outside; (Technical Concept 6) The second housing has a second housing hole (301) that communicates the inside and the outside; (Technical Concept 6) A shaft (34) provided such that one end is joined to the movable core and the other end is located inside the second housing hole and the first housing hole; and (Technical Concept 6) A diaphragm (40) provided between the first housing hole and the second housing hole on the radially outer side of the shaft, capable of sealing between the inside and outside of the first housing and between the inside and outside of the second housing. (Technical Idea 7) An electromagnetic actuator according to any one of Technical Ideas 1 to 6, further comprising: a first transmission unit (110); a second transmission unit (120) provided so as to be rotatable relative to the first transmission unit; and a fork (50) driven by the drive of the movable core, wherein the driven unit has a fixed clutch (60) fixed to the second transmission unit, and a movable clutch (70) provided so as to be axially movable relative to the first transmission unit by the drive of the fork, and which, by engaging with the fixed clutch, allows the transmission of torque between the first transmission unit and the second transmission unit. 【0074】 Thus, this disclosure is not limited to the embodiments described above, and can be implemented in various forms without departing from its essence. 【0075】 This disclosure is described based on embodiments. However, this disclosure is not limited to such embodiments and structures. This disclosure also includes various modifications and variations within the scope of equivalents. Furthermore, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer elements, fall within the scope and idea of ​​this disclosure.

Claims

1. An electromagnetic actuator comprising: a driven part (130); a first housing (20) housing the driven part inside; a movable core (32) provided outside the first housing; an electromagnetic coil (33) capable of driving the driven part by driving the movable core with electromagnetic force; a second housing (31) housing the movable core and the electromagnetic coil; a bolt (91) provided radially inward from the outermost diameter portion (G1) of a specific end face (310), which is the end face of the second housing on the first housing side in the axial direction, with one end of the bolt joined to the specific end face; and a nut (92) that is screwed onto the other end of the bolt and capable of fixing the second housing and the first housing with the first housing sandwiched between them.

2. The electromagnetic actuator according to claim 1, wherein a plurality of bolts are provided on the outer edge of the specific end face.

3. The electromagnetic actuator according to claim 1 or 2, wherein the other end of the bolt is located inside the first housing.

4. The electromagnetic actuator according to claim 3, wherein the first housing is capable of containing a lubricant, and further comprises a sealing member (93) provided at the other end of the bolt.

5. The electromagnetic actuator according to claim 4, wherein the nut is a cap nut and the sealing member is a washer or an O-ring.

6. The electromagnetic actuator according to claim 1 or 2, further comprising: a first housing having a first housing hole (201) that communicates the inside and outside; a second housing having a second housing hole (301) that communicates the inside and outside; a shaft (34) having one end joined to the movable core and the other end positioned inside the second housing hole and the first housing hole; and a diaphragm (40) provided radially outside the shaft between the first housing hole and the second housing hole, capable of sealing between the inside and outside of the first housing and between the inside and outside of the second housing.

7. The electromagnetic actuator according to claim 1 or 2, further comprising: a first transmission unit (110); a second transmission unit (120) provided so as to be rotatable relative to the first transmission unit; and a fork (50) driven by the drive of the movable core, wherein the driven unit comprises: a fixed clutch (60) fixed to the second transmission unit; and a movable clutch (70) provided so as to be axially movable relative to the first transmission unit by the drive of the fork, and capable of transmitting torque between the first transmission unit and the second transmission unit by engaging with the fixed clutch.

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