Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
  • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
  • F16H25/20—Screw mechanisms
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa

Definitions

• This disclosure relates to actuators.
• Patent Document 1 discloses a disconnector device that is installed in a vehicle and switches between a two-wheel drive state and a four-wheel drive state.
• This disconnector device can switch between a two-wheel drive state and a four-wheel drive state by separating or connecting the differential shaft and the hub depending on the driving conditions.
• the disconnector device includes a ball screw shaft that rotates when the motor is operated, a nut connected to the ball screw shaft, a sleeve that moves together with the nut, and a fork engaged with the sleeve. The motor rotates the ball screw shaft, and the nut moves the fork via the sleeve, thereby connecting or disconnecting the differential shaft and the hub.
• the purpose of this disclosure is to obtain an actuator that can shorten the shaft from the rotating part to the axial displacement part.
• the actuator includes a stator formed in an annular shape that generates a rotating magnetic field, a shaft formed of a soft magnetic material and disposed radially inward of the stator and equipped with a magnet, the shaft rotating as the stator generates a rotating magnetic field, and an axial displacement portion disposed at the center of rotation of the shaft that displaces in the axial direction as the shaft rotates.
• FIG. 1 is a cross-sectional view showing a cross section of an actuator according to a first embodiment taken along an axial direction
• FIG. 2 is a front view showing an engagement portion between a fork and a main shaft
• FIG. 3 is a cross-sectional view showing a cross section of an actuator according to a second embodiment taken along an axial direction
• FIG. 4 is a cross-sectional view showing a cross section of an actuator according to a third embodiment taken along an axial direction
• FIG. 5 is a cross-sectional view showing a cross section of the actuator according to the fourth embodiment taken along the axial direction.
• FIG. 1 An actuator 10 according to a first embodiment of the present disclosure will be described with reference to Figures 1 and 2.
• the arrow Z direction, arrow R direction, and arrow C direction appropriately shown in the figures respectively indicate one side in the rotational axial direction, the outer side in the rotational radial direction, and one side in the rotational circumferential direction of a rotor 16 described later.
• hereinafter when simply indicating an axial direction, a radial direction, or a circumferential direction, it indicates the rotational axial direction, the rotational radial direction, and the rotational circumferential direction of the rotor 16 unless otherwise specified.
• the actuator 10 of this embodiment includes a stator 12 that generates a rotating magnetic field, and a housing 14 that contains the stator 12 and the like.
• the actuator 10 also includes a rotor 16 that rotates when the stator 12 generates a rotating magnetic field, and a linear motion part 18 that serves as an axial displacement part that is displaced in the axial direction when the rotor 16 rotates.
• the actuator 10 also includes a fork 20 that serves as a transmission part and is connected to the linear motion part 18.
• the stator 12 is composed of a stator core 22 formed in an annular shape and a number of coils 24 formed around the stator core 22. A rotating magnetic field is generated around the stator 12 by switching the flow of electricity to the multiple coils 24.
• the stator 12 is supported by the housing 14, which will be described later, for example by pressing the stator core 22 into the housing 14.
• the housing 14 is formed in a cylindrical shape that penetrates in the axial direction.
• the housing 14 includes a stator support portion 14A on which the stator 12 is supported on the radially inner side.
• the housing 14 also includes a bearing support portion 14B on which the bearing 26 is supported on the radially inner side.
• the bearing support portion 14B is disposed adjacent to the stator support portion 14A on one axial side of the stator support portion 14A, and has a smaller diameter than the stator support portion 14A.
• the housing 14 also includes an oil seal support portion 14C on which the oil seal 28 is supported on the radially inner side.
• the oil seal support portion 14C is disposed adjacent to the bearing support portion 14B on one axial side of the bearing support portion 14B, and has a smaller diameter than the bearing support portion 14B.
• a control portion 30 and a housing cover 32 for controlling the current supply to the stator 12 (multiple coils 24) are provided on the other axial side of the housing 14.
• the other axial side of the housing 14 is closed by the control portion 30 and the housing cover 32.
• a bearing 34 is fixed to the housing cover 32.
• the rotor 16 includes a shaft 36 formed of a soft magnetic material such as steel, and a magnet 38 provided on the shaft.
• the shaft 36 includes a large diameter portion 36A disposed radially inward relative to the stator 12.
• the shaft 36 also includes a medium diameter portion 36B that protrudes from the large diameter portion 36A toward one axial side and has an outer diameter set smaller than that of the large diameter portion 36A.
• the shaft 36 also includes a small diameter portion 36C that protrudes from the large diameter portion 36A toward the other axial side and has an outer diameter set smaller than that of the medium diameter portion 36B.
• the portion of the medium diameter portion 36B adjacent to the large diameter portion 36A is supported by the bearing 26, and the end of the small diameter portion 36C on the other axial side is supported by the bearing 34.
• the magnet 38 is fixed to the radially outer surface of the large diameter portion 36A.
• the magnet 38 may be a segment magnet divided in the circumferential direction, or may be a ring magnet formed in an annular shape.
• the magnet 38 may be configured to be provided on the inner periphery of the large diameter portion 36A.
• a linear motion portion insertion hole 36D into which the linear motion portion 18 described later is inserted from one axial side is formed at the rotation center of the large diameter portion 36A and the medium diameter portion 36B.
• the end of the linear motion portion insertion hole 36D on one axial side is opened on one axial side at the end face on one axial side of the medium diameter portion 36B.
• the end of the linear motion portion insertion hole 36D on the other axial side is closed inside the large diameter portion 36A.
• a first screw portion 36E is formed along the axial direction on the inner periphery of the linear motion portion insertion hole 36D.
• the linear motion part 18 is formed using a rod-shaped steel material.
• a second screw part 18A is formed along the axial direction on the outer periphery of this linear motion part 18.
• the linear motion part 18 is inserted into the linear motion part insertion hole 36D of the shaft 36 with the second screw part 18A and the first screw part 36E screwed together.
• the fork 20 is disposed on the radial outer periphery of the medium diameter portion 36B of the shaft 36.
• the fork 20 includes a slide support portion 20A slidably supported on the medium diameter portion 36B of the shaft 36, and a main shaft engagement portion 20B protruding radially outward from the slide support portion 20A.
• the slide support portion 20A is formed with a slide hole 20C into which the medium diameter portion 36B of the shaft 36 is inserted.
• the inner peripheral surface of the slide hole 20C slides against the outer peripheral surface of the medium diameter portion 36B, allowing the fork 20 to move (displace) in the axial direction along the medium diameter portion 36B of the shaft 36.
• the main shaft engagement portion 20B of the fork 20 engages with the main shaft 40 that constitutes part of the mechanism that is the control target of the actuator 10 of this embodiment. This allows power to be transmitted from the fork 20 to the control target.
• the fork 20 is also connected to the linear motion part 18 via a connecting member 42.
• the connecting member 42 has a first connecting part 42A that is fixed to one axial end of the linear motion part 18 via a fastening member 44.
• the connecting member 42 also has a second connecting part 42B that extends from the radially outer end of the first connecting part 42A toward the other axial side. The other axial end of this second connecting part 42B is fixed to the fork 20 via a fastening member 46. This allows the fork 20 to move axially together with the linear motion part 18 and the connecting member 42.
• the shaft 36 rotates toward the other circumferential side relative to the linear moving part 18, and the linear moving part 18 moves toward the other axial side relative to the shaft 36.
• the fork 20 can be moved axially along the main shaft 40 by moving the linear moving part 18 in the axial direction. This allows you to control the controlled object.
• the linear motion part 18 is configured to be inserted into the center of rotation of the shaft 36. In this configuration, compared to a configuration in which the linear motion part 18 is disposed on the axial extension of the shaft 36, it is possible to shorten the axial length of the range from the shaft 36, which is the rotating part, to the linear motion part 18.
• the fork 20 is supported slidably on the medium diameter portion 36B of the shaft 36.
• This configuration makes it unnecessary to provide a part whose only function is to support the fork 20. As a result, it is possible to prevent the number of parts of the actuator 10 from increasing and the configuration from becoming complicated.
• the fork 20 engages with the main shaft 40, thereby preventing the linear motion part 18 from rotating in the circumferential direction.
• This configuration makes it unnecessary to provide a part whose only function is to prevent the linear motion part 18 from rotating in the circumferential direction. As a result, it is possible to prevent the number of parts of the actuator 10 from increasing and the configuration from becoming complicated.
• a magnet 38 is provided on the large diameter portion 36A of the shaft 36. This allows the large diameter portion 36A of the shaft 36 to function as the rotor core of the rotor 16. With this configuration, it is possible to prevent an increase in the number of parts of the rotor 16 compared to a rotor in which the rotor core is fixed to the shaft.
• stator support portion 14A, the bearing support portion 14B, and the oil seal support portion 14C of the housing 14 are arranged adjacent to each other in the axial direction, so that the stator 12, the bearing 26, and the oil seal 28 are arranged adjacent to each other in the axial direction.
• stator 12, the bearing 26, and the oil seal 28 are arranged adjacent to each other in the axial direction.
• an actuator 48 according to a second embodiment will be described with reference to Fig. 3.
• members and parts corresponding to those of the actuator 10 described above are denoted by the same reference numerals as those of the actuator 10 described above, and descriptions thereof may be omitted.
• the shaft 36 of the actuator 48 of this embodiment has a medium diameter portion 36B that protrudes from the large diameter portion 36A toward one axial side and the other axial side.
• the fork 20 is disposed on the radial outer periphery of the medium diameter portion 36B of the shaft 36.
• a linear motion portion insertion hole 36D into which the linear motion portion 18 is inserted is formed in the rotation center of the large diameter portion 36A and the medium diameter portion 36B.
• the end of the linear motion portion insertion hole 36D on one axial side is opened to one axial side at the end face of the medium diameter portion 36B on one axial side.
• the end of the linear motion portion insertion hole 36D on the other axial side is opened to the other axial side at the end face of the medium diameter portion 36B on the other axial side. That is, the linear motion portion insertion hole 36D is configured to penetrate the rotation center of the shaft 36 in the axial direction.
• a linear motion part 18 that is longer than that of the actuator 10 described above can be provided at the center of rotation of the shaft 36.
• the axial movement range of the linear motion part 18 and the fork 20 can be expanded compared to the actuator 10 described above.
• an actuator 50 according to a third embodiment will be described with reference to Fig. 4.
• members and parts corresponding to those of the actuator 10 described above are denoted by the same reference numerals as those of the actuator 10 described above, and descriptions thereof may be omitted.
• the fork 20 is disposed on the radial outer periphery of the large diameter portion 36A of the shaft 36 and on the radial outer periphery of the stator support portion 14A of the housing 14.
• the fork 20 is supported so as to be slidable on the stator support portion 14A of the housing 14. More specifically, the stator support portion 14A of the housing 14 is inserted into the slide hole 20C of the slide support portion 20A. The inner circumferential surface of the slide hole 20C slides against the outer circumferential surface of the stator support portion 14A, allowing the fork 20 to move axially along the stator support portion 14A of the housing 14.
• the axial length of the medium diameter portion 36B of the shaft 36 can be set shorter than in the actuator 10 described above.
• the actuator 50 of this embodiment described above can be made smaller in size in the axial direction than in the actuator 10 described above.
• an actuator 52 according to a fourth embodiment will be described with reference to Fig. 5.
• members and parts corresponding to those of the actuator 10 described above are denoted by the same reference numerals as those of the actuator 10 described above, and descriptions thereof may be omitted.
• the portion of the shaft 36 of the actuator 10 described above that corresponds to the large diameter portion 36A is the small diameter portion 36C.
• the rotor core 54 is fixed to this small diameter portion 36C by press fitting or the like.
• the magnet 38 is fixed to the outer circumferential surface of the rotor core 54.
• the fork 20 is disposed on the radial outer periphery of the medium diameter portion 36B of the shaft 36.
• the actuator 52 of this embodiment described above has a configuration including a rotor core 54.
• the actuator 52 can be designed to be capable of using the rotor core 54 of another motor.
• the fork 20 is moved axially by the linear motion part 18, but the present disclosure is not limited to this.
• the linear motion part 18 may be configured to move a member other than the fork 20 in the axial direction.
• the linear motion part 18 may be configured to directly engage with the controlled object.
• a stator (12) formed in an annular shape to generate a rotating magnetic field; a shaft (36) formed of a soft magnetic material, arranged radially inward relative to the stator, and provided with a magnet (38), the shaft (36) rotating when the stator generates a rotating magnetic field;
• An axial displacement portion (18) provided at the rotation center of the shaft and displaced in the axial direction as the shaft rotates;
• An actuator (10, 48, 50, 52) comprising: (Appendix 2)
• a transmission part (20) connected to the axial displacement part is provided on the radial outer side of the shaft, 2.
• the transmission portion is provided along an outer circumferential surface of the shaft, 3.
• the actuator according to claim 2 wherein the axial displacement portion is displaced in the axial direction, thereby displacing the transmission portion along the outer circumferential surface of the shaft.
• the transmission portion is provided radially outward of the stator and along an outer circumferential surface of a housing (14) that supports the stator, 3.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Power Engineering (AREA)
• Permanent Magnet Type Synchronous Machine (AREA)
• Transmission Devices (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

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Citations (2)

• 2023
  • 2023-09-15 JP JP2023150589A patent/JP2025043202A/ja active Pending
• 2024
  • 2024-07-10 CN CN202480058651.8A patent/CN121844469A/zh active Pending
  • 2024-07-10 WO PCT/JP2024/025019 patent/WO2025057551A1/ja active Pending

Patent Citations (2)

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