Motor, actuator, and steering device

Abstract

According to one embodiment of the present invention, a motor is provided in a steer-by-wire steering device mounted on a vehicle and generates a steering reaction force to a steering wheel of the vehicle, the motor being provided with: a rotor capable of rotating about a central axis; and a stator facing the rotor with a gap therebetween. The rotor has: a motor shaft extending in the axial direction of the central axis; and a rotor body fixed to the motor shaft. The stator and the rotor body are disposed so as to face each other in the axial direction. The motor shaft is directly connected to the steering wheel.

Description

Technical Field

[0001] This invention relates to motors, actuators, and steering devices. Background Technology

[0002] Previously, a separate power steering device where the steering mechanism and the rudder mechanism are not mechanically connected to each other was known, namely a steering device of the so-called steer-by-wire type (for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 4639500. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In steering systems like those described above, it is desirable to miniaturize the steering mechanism.

[0008] In view of the above, one of the objects of the present invention is to provide motors, actuators and steering devices that enable miniaturization of steering devices.

[0009] Methods for solving problems

[0010] One embodiment of the motor of the present invention is a motor included in a steering device of a vehicle with a steer-by-wire system, which generates a steering reaction force on the steering wheel of the vehicle. The motor includes: a rotor rotatable about a central axis; and a stator opposed to the rotor with a gap. The rotor has: a motor shaft extending axially along the central axis; and a rotor body fixed to the motor shaft. The stator and the rotor body are axially opposed. The motor shaft is directly connected to the steering wheel.

[0011] One embodiment of the actuator of the present invention includes: the motor described above; and an adjustment mechanism capable of adjusting the position of the steering wheel. The motor has a cylindrical portion that holds the stator inside, and the motor is disposed axially between the steering wheel and the adjustment mechanism. The cylindrical portion is cylindrical with an opening on the side where the adjustment mechanism is located in the axial direction. The opening is blocked by the adjustment mechanism.

[0012] One embodiment of the actuator of the present invention includes: the motor described above; and an adjustment mechanism capable of adjusting the position of the steering wheel. The motor is disposed axially between the steering wheel and the adjustment mechanism.

[0013] One aspect of the steering device of the present invention is a steering device for a steer-by-wire system mounted on a vehicle, the steering device comprising: a steering mechanism having a steering wheel and the aforementioned actuator for applying force to the steering wheel; and a steering mechanism driven based on the steering angle of the steering wheel.

[0014] The effects of the invention

[0015] According to one aspect of the present invention, the steering mechanism can be miniaturized in the steering system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the steering device in the first embodiment.

[0017] Figure 2 This is a partial cross-sectional view showing a portion of the steering device according to the first embodiment.

[0018] Figure 3 This is a partial cross-sectional view showing a portion of the steering device according to the second embodiment.

[0019] Figure 4 This is a partial cross-sectional view showing a portion of the steering device according to the third embodiment.

[0020] Figure 5 This is a partial cross-sectional view showing a portion of the steering device according to the fourth embodiment.

[0021] Figure 6 This is a partial cross-sectional view showing a portion of the steering device according to the fifth embodiment. Detailed Implementation

[0022] In the accompanying drawings, the XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The side towards which the arrow on the Z-axis points (+Z side) is the upper side, and the opposite side (-Z side) is the lower side. The X-axis direction is orthogonal to the Z-axis direction and represents the forward / backward direction of the vehicle equipped with the steering device in the following embodiments. In the following embodiments, the side towards which the arrow on the X-axis points (+X side) is the front side of the vehicle, and the opposite side (-X side) is the rear side of the vehicle. The Y-axis direction is orthogonal to both the X-axis and Z-axis directions and represents the left / right direction of the vehicle, i.e., the vehicle width direction. In the following embodiments, the side towards which the arrow on the Y-axis points (+Y side) is the left side of the vehicle, and the opposite side (-Y side) is the right side of the vehicle. The Z-axis direction is, for example, the vertical direction. The X-axis and Y-axis directions are, for example, the horizontal directions.

[0023] <First Implementation Method>

[0024] Figure 1 The steering device 100 of this embodiment shown is mounted on a vehicle. The steering device 100 is a steer-by-wire type steering device. Figure 1 As shown, the steering system 100 includes a steering mechanism 101 and a steering device 102. The steering mechanism 101 has a steering wheel 103 operated by the driver and an actuator 10 that applies force to the steering wheel 103. The steering device 102 has a steering mechanism 90 and a steering-side actuator 107. The steering mechanism 101 and the steering device 102 are not mechanically connected to each other. The steering device 102 is driven based on the steering angle θ of the steering wheel 103.

[0025] The steering mechanism 90 includes a first steering wheel 94a, a second steering wheel 94b, a rack and pinion shaft 91, tie rods 92a and 92b, and steering knuckle arms 93a and 93b. The rack and pinion shaft 91 extends along the left-right direction of the vehicle, i.e., the vehicle width direction. The first steering wheel 94a is connected to one end of the rack and pinion shaft 91 via the tie rod 92a and the steering knuckle arm 93a. The second steering wheel 94b is connected to the other end of the rack and pinion shaft 91 via the tie rod 92b and the steering knuckle arm 93b.

[0026] The steering-side actuator 107 includes a steering-side control device 108 and a steering-side motor 109. The steering-side control device 108 controls the steering-side motor 109 based on signals from the control device 40 (described later). The steering-side motor 109 is connected to a rack and pinion shaft 91. The steering-side motor 109 drives the steering mechanism 90 via the rack and pinion shaft 91. By driving the steering mechanism 90 by the steering-side motor 109, the angles of the first steering wheel 94a and the second steering wheel 94b change, thus changing the vehicle's direction of travel. The first steering wheel 94a and the second steering wheel 94b are a pair of front tires in the vehicle. The angles of the first steering wheel 94a and the second steering wheel 94b are the actual steering angles.

[0027] The steering wheel 103 is rotated by the driver around a central axis J. The central axis J is an imaginary axis. For example... Figure 2As shown, in this embodiment, the central axis J extends in a direction inclined upwards and downwards relative to the longitudinal direction. The central axis J is located on the upper side as it approaches the rear (-X side). The direction in which the central axis J extends is orthogonal to the left-right direction (Y-axis direction) of the vehicle. In the following description, unless otherwise specified, the axial direction in which the central axis J extends is simply referred to as the "axial direction". Furthermore, the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". The rotation angle of the steering wheel 103 about the central axis J is the steering angle θ. In the accompanying drawings, the direction in which the central axis J extends is indicated by arrow D1. The side towards which arrow D1 points (+D1 side) is called the "axial side", and the opposite side (-D1 side) is called the "axial side". The axial side is the rear and upper side. The axial side is the front (+X side) and lower side.

[0028] In the attached diagram, arrow D2 indicates a direction orthogonal to both the left-right direction (Y-axis direction) and the axial direction of the vehicle. In the following description, the direction in which arrow D2 extends is referred to as the "orthogonal direction," the side towards which arrow D2 points (+D2 side) is referred to as "one side of the orthogonal direction," and the opposite side (-D2 side) is referred to as "the other side of the orthogonal direction." One side of the orthogonal direction is the upper and front side (+X side). The other side of the orthogonal direction is the lower and rear side (-X side).

[0029] The steering wheel 103 has a base 104 and a main body 105 fixed to the base 104. The base 104 has a receiving portion 104d. Although not shown in the figure, an airbag is housed inside the receiving portion 104d. The base 104 has an opposing wall portion 104c located on the opposite side (-D1 side) of the axial direction. The opposing wall portion 104c is the wall portion on the opposite side of the axial direction that constitutes the receiving portion 104d. The base 104 has a connecting cylinder portion 104b protruding from the axial side (+D1 side) of the opposing wall portion 104c. The axial side surface of the opposing wall portion 104c forms part of the inner surface of the receiving portion 104d. The connecting cylinder portion 104b is cylindrical and opens on the opposite side of the axial direction with the central axis J as the center. The opening on the opposite side of the axial direction of the connecting cylinder portion 104b opens on the opposite side of the axial direction of the opposing wall portion 104c. By providing a connecting cylinder portion 104b, a connecting hole portion 104a is provided that is recessed from the axial side of the base portion 104 on the axial side.

[0030] like Figure 1 As shown, actuator 10 is an actuator that generates steering reaction force on the steering wheel 103 of the vehicle. Actuator 10 includes motor 20, adjustment mechanism 30, and control device 40. That is, steering system 100 includes motor 20, adjustment mechanism 30, and control device 40.

[0031] Motor 20 generates a steering reaction force around the central axis J on the vehicle's steering wheel 103. For example... Figure 2 As shown, the motor 20 is located on the other side of the steering wheel 103 (-D1 side) axially. No reduction gear is provided between the motor 20 and the steering wheel 103. Therefore, compared to the case where a reduction gear is provided between the motor 20 and the steering wheel 103, the steering device 101 can be miniaturized axially. The motor 20 includes a housing 50, a rotor 60, a stator 70, and a bearing 63. The housing 50 internally houses the rotor 60, the stator 70, and the bearing 63. The housing 50 has a cover 51, a cylindrical portion 52, a bottom 53, and a bearing retaining portion 54. That is, the motor 20 includes a cover 51, a cylindrical portion 52, a bottom 53, and a bearing retaining portion 54. It should be noted that the cover 51, the cylindrical portion 52, the bottom 53, and the bearing retaining portion 54 can also be separated from each other. Alternatively, two or three of the parts of the cover 51, cylinder 52, bottom 53, and bearing retainer 54 may be part of the same single component, and the remaining parts of the cover 51, cylinder 52, bottom 53, and bearing retainer 54 may be separate from the single component.

[0032] The cylindrical portion 52 is cylindrical, surrounding the central axis J. More specifically, the cylindrical portion 52 is generally cylindrical, centered on the central axis J. The cylindrical portion 52 internally holds the stator 70. A cover portion 51 is provided at the end of the cylindrical portion 52 on one axial side (+D1 side). The cover portion 51 is annular, centered on the central axis J. The cover portion 51 is plate-shaped, with its surface facing the axial direction. The radial outer edge of the cover portion 51 is connected to the end of the cylindrical portion 52 on one axial side. The cover portion 51 covers the stator 70 from one axial side. The cover portion 51 is axially spaced from the opposing wall portion 104c. A bottom 53 is provided at the end of the cylindrical portion 52 on the other axial side (-D1 side). The bottom 53 is a circular plate, centered on the central axis J. The bottom 53 closes the end of the cylindrical portion 52 on the other axial side.

[0033] A bearing retaining portion 54 is provided on the radial inner edge of the cover portion 51. The bearing retaining portion 54 protrudes from the cover portion 51 toward the axial side (+D1 side). The bearing retaining portion 54 is cylindrical about the central axis J. The bearing retaining portion 54 has a peripheral wall portion 54a protruding from the radial inner edge of the cover portion 51 toward the axial side and an annular wall portion 54b protruding radially inward from the end of the peripheral wall portion 54a on the axial side. The annular wall portion 54b is annular about the central axis J.

[0034] The rotor 60 is rotatable about its central axis J. The rotor 60 has a motor shaft 61 and a rotor body 62. The motor shaft 61 extends axially along the central axis J. The motor shaft 61 is generally cylindrical about the central axis J. The motor shaft 61 passes axially through the radially inner side of the cover portion 51 and the radially inner side of the bearing retainer portion 54. The end of the motor shaft 61 on one axial side (+D1 side) is located axially closer to the bearing retainer portion 54 and outside the housing 50.

[0035] The motor shaft 61 is directly connected to the steering wheel 103. Therefore, compared to the case where the motor shaft 61 and the steering wheel 103 are connected via a steering shaft and a reduction mechanism, the steering device 101 can be axially miniaturized by eliminating the need for a steering shaft and a reduction mechanism. In this embodiment, instead of a steering shaft connected to the steering wheel 103, the motor shaft 61 is directly connected to the steering wheel 103. This direct connection between the motor shaft 61 and the steering wheel 103 can also be described as a configuration where the motor shaft 61 serves as both the steering shaft and the steering shaft. In this embodiment, the steering shaft is not separated from the motor shaft 61, and no connecting member is needed to connect the motor shaft 61 to the steering shaft. Therefore, according to this embodiment, compared to the case where the motor shaft 61 is connected to the steering shaft, the steering device 101 can be further miniaturized axially.

[0036] In this embodiment, the motor shaft 61 is fitted and fixed within the connecting hole portion 104a, i.e., within the connecting cylinder portion 104b. More specifically, the axial side (+D1 side) end of the motor shaft 61 is fitted and fixed within the connecting hole portion 104a, i.e., within the connecting cylinder portion 104b. Thus, the motor shaft 61 is directly connected to the steering wheel 103. The method of fixing the motor shaft 61 to the steering wheel 103 is not particularly limited. The motor shaft 61 can be pressed into the connecting hole portion 104a and fixed to the steering wheel 103, or it can be fixed to the steering wheel 103 by screws, or it can be fixed to the steering wheel 103 by adhesive.

[0037] The rotor body 62 is fixed to the motor shaft 61. The rotor body 62 has a rotor core 62c, a first magnet 62d, and a second magnet 62e. The rotor core 62c is fixed to the outer circumferential surface of the motor shaft 61. The rotor core 62c is an annular shape centered on the central axis J. The rotor core 62c is a plate with its plate surface facing the axial direction. The first magnet 62d is fixed to one axial side (+D1 side) of the rotor core 62c. The second magnet 62e is fixed to the other axial side (-D1 side) of the rotor core 62c. The first magnet 62d and the second magnet 62e are annular shapes surrounding the central axis J. The first magnet 62d and the second magnet 62e are plate-shaped with their plate surfaces facing the axial direction. The radially inner edges of the first magnet 62d and the second magnet 62e are arranged to be radially separated from the outer circumferential surface of the motor shaft 61. The magnetic poles of the first magnet 62d and the second magnet 62e each include multiple N poles and multiple S poles arranged alternately around the central axis J.

[0038] The stator 70 and rotor 60 are positioned opposite each other with a gap. In this embodiment, the stator 70 and rotor 60 are arranged opposite each other in the axial direction. More specifically, the stator 70 and rotor body 62 are arranged opposite each other in the axial direction. That is, the motor 20 is an axial gap type motor in which the rotor 60 and stator 70 are positioned opposite each other with an axial gap. By making the motor 20 an axial gap type motor in this way, it is easier to reduce the size of the motor 20 in the axial direction compared to making the motor 20 a radial gap type motor. As a result, the steering device 101 can be further reduced in size in the axial direction. In addition, by making the motor 20 an axial gap type motor, it is easier to increase the torque of the motor 20 compared to making the motor 20 a radial gap type motor.

[0039] As described above, in this embodiment, the stator 70 and rotor body 62 are axially opposed, and the motor shaft 61 is directly connected to the steering wheel 103. This allows for appropriate axial miniaturization of the steering device 101 and increases the torque of the motor 20. Furthermore, in this embodiment, the stator 70 and rotor 60 are axially opposed, and no reduction gear is provided between the motor 20 and the steering wheel 103. This allows for appropriate axial miniaturization of the steering device 101 and increases the torque of the motor 20.

[0040] The stator 70 is annular, surrounding the motor shaft 61. More specifically, the stator 70 is approximately annular about the central axis J. The stator 70 is fixed to the inner circumferential surface of the cylindrical portion 52. More specifically, the radially outer surface of the stator 70 is fixed to the inner circumferential surface of the cylindrical portion 52. The method of fixing the stator 70 to the cylindrical portion 52 is not particularly limited. The stator 70 can be fixed to the cylindrical portion 52 by pressing, by thermoforming, or by screws or adhesives. The stator 70 has a stator core 73 and coils 74. In this embodiment, multiple stator cores 73 and coils 74 are spaced apart circumferentially. Multiple coils 74 are respectively mounted on multiple stator cores 73. Each coil 74 is mounted on each stator core 73, for example, through an insulator (not shown).

[0041] In this embodiment, the stator 70 includes a first stator 71 and a second stator 72. The first stator 71 is located on one axial side (+D1 side) of the rotor body 62. The second stator 72 is located on the other axial side (-D1 side) of the rotor body 62. By configuring the motor 20 as an axially spaced type with two stators 70 relative to one rotor body 62, compared to a motor with two rotor bodies 62 relative to one stator 70, the rotating portion of the motor 20 can be reduced, simplifying the motor 20's construction. Furthermore, compared to a case where the stator 70 is sandwiched between two rotor bodies 62 in the axial direction, it is easier to fix each stator 70 within the housing 50.

[0042] The first stator 71 is an annular ring surrounding the portion of the motor shaft 61 located on the axial side (+D1 side) of the rotor body 62. The second stator 72 is an annular ring surrounding the portion of the motor shaft 61 located on the opposite axial side (-D1 side) of the rotor body 62. The first stator 71 and the second stator 72 are axially separated from the rotor body 62. The stator core 73 of the first stator 71 is axially opposed to the first magnet 62d of the rotor body 62 through a gap. The stator core 73 of the second stator 72 is axially opposed to the second magnet 62e of the rotor body 62 through a gap.

[0043] The motor 20 has a conductive portion 74a that is electrically connected to the stator 70. The conductive portion 74a extends radially outward from the stator 70 and is connected to the substrate 41 described later. In this embodiment, the conductive portion 74a is a coil lead wire extending radially outward from the coil 74. The conductive portion 74a, as a coil lead wire, is formed by the end of the wire constituting the coil 74. It should be noted that the conductive portion 74a may also be a busbar electrically connected to the coil 74. In this embodiment, the conductive portion 74a includes a plurality of conductive portions 74a extending radially outward from the first stator 71 and a plurality of conductive portions 74a extending radially outward from the second stator 72.

[0044] Bearing 63 supports rotor 60 for rotation. In this embodiment, bearing 63 is a rolling bearing. More specifically, bearing 63 is a ball bearing. In this embodiment, bearing 63 includes a first bearing 63a and a second bearing 63b. That is, motor 20 includes a first bearing 63a and a second bearing 63b. The first bearing 63a supports the portion of motor shaft 61 located on the axial side (+D1 side) of rotor body 62 for rotation. The second bearing 63b supports the portion of motor shaft 61 located on the opposite axial side (-D1 side) of rotor body 62 for rotation. The first bearing 63a is located on the axial side of stator 70. The second bearing 63b is located on the opposite axial side of stator 70. The first bearing 63a is held inside bearing retainer 54. The first bearing 63a is supported from the axial side by annular wall portion 54b. The second bearing 63b is held by bearing cage 55 housed inside housing 50. Bearing cage 55 is annular surrounding motor shaft 61. The radial outer edge of the bearing cage 55 is fixed to the inner circumferential surface of the cylindrical portion 52. The bearing cage 55 is located on the opposite axial side of the two stators 70. The bearing cage 55 is configured to face the opposite axial side of the second stator 72 with a clearance.

[0045] The control device 40 controls the motor 20. The control device 40 is electrically connected to the stator 70. In this embodiment, the control device 40 is located radially outward of the motor 20. Therefore, compared to the case where the control device 40 is arranged axially on the motor 20, the steering device 101 can be further miniaturized in the axial direction. Furthermore, in a vehicle, compared to the space radially outward of the adjustment mechanism 30, the space radially outward of the motor 20 is difficult to accommodate other components and is easily left unused. Therefore, by using the space radially outward of the motor 20 as space for accommodating the control device 40, the space inside the vehicle can be effectively and flexibly utilized.

[0046] In this embodiment, the control device 40 is located on the other side (-D2 side) of the housing 50 in the orthogonal direction. The control device 40 has a base plate 41 and a housing 42. The housing 42 is fixed to the surface of the housing 50 on the other side in the orthogonal direction. The housing 42 is box-shaped with an opening on one side (+D2 side) in the orthogonal direction.

[0047] The surface of the substrate 41 faces radially. Therefore, compared to the case where the surface of the substrate 41 faces axially, the control device 40 can be miniaturized radially. This, in turn, allows for the radial miniaturization of the steering device 101. In this embodiment, the surface of the substrate 41 faces an orthogonal direction (D2 axis direction). The substrate 41 is housed inside the housing 42. In this embodiment, the substrate 41 is fixed to the housing 42. A conductive portion 74a is connected to the substrate 41. The substrate 41 is electrically connected to the coil 74 of the stator 70 via the conductive portion 74a. In this embodiment, the substrate 41 is electrically connected to both the first stator 71 and the second stator 72 via the conductive portion 74a. The conductive portion 74a, extending radially outward from the coil 74 of the first stator 71, passes through a through hole 52c provided in the cylindrical portion 52 and connects to the substrate 41. The conductive portion 74a, extending radially outward from the coil 74 of the second stator 72, passes through a through hole 52d provided in the cylindrical portion 52 and connects to the substrate 41. In this embodiment, since the conductive part 74a extends radially outward from the stator 70 and is connected to the substrate 41, the substrate 41 with its surface facing radially can be easily connected to the stator 70.

[0048] An inverter circuit that supplies power to the stator 70 is provided on the substrate 41. Power is supplied from the inverter circuit on the substrate 41 to the coil 74 of the stator 70 via the conductive part 74a, thereby driving the motor 20.

[0049] The actuator 10 includes a rotation detection device 80 capable of detecting the rotation angle of the rotor 60. The rotation detection device 80 is housed inside the housing 50. The rotation detection device 80 is located axially between the bearing cage 55 and the bottom 53 inside the housing 50. The rotation detection device 80 includes a sensor substrate 81, a rotation sensor 82, and a sensor magnet 83. The surface of the sensor substrate 81 faces axially. The sensor substrate 81 is fixed to the bottom 53. The sensor substrate 81 is electrically connected to the substrate 41 via a wiring 84. The wiring 84 extends from the inside of the housing 42 through a through hole 52e provided in the cylindrical portion 52 into the interior of the housing 50.

[0050] A rotation sensor 82 is mounted on one axial side (+D1 side) of the sensor substrate 81. In this embodiment, the rotation sensor 82 is a magnetic sensor. The rotation sensor 82 can be a magnetoresistive (MR) sensor or a Hall element. The rotation sensor 82 can be any type of sensor as long as it can detect the rotation of the rotor 60. A sensor magnet 83 is fixed to the rotor 60. In this embodiment, the sensor magnet 83 is fixed to the end face of the other axial side (-D1 side) of the motor shaft 61. The sensor magnet 83 is a circular plate centered on the central axis J. The sensor magnet 83 and the rotation sensor 82 are axially opposed with a gap between them. The rotation sensor 82 can detect the rotation angle of the rotor 60 by detecting the magnetic field of the sensor magnet 83.

[0051] Motor 20 has a torque sensor 85. The torque sensor 85 is a sensor capable of detecting the torque generated by motor shaft 61 about its central axis J. The torque sensor 85 is, for example, a strain gauge. The torque sensor 85 is mounted on the outer peripheral surface of motor shaft 61. In this embodiment, the torque sensor 85 is mounted on the outer peripheral surface of the portion of motor shaft 61 located on the axial side (+D1 side) of the rotor body 62. The torque sensor 85 can be mounted at any location on motor shaft 61 as long as it can detect the torque generated by motor shaft 61 about its central axis J. The torque sensor 85 can be any type of sensor as long as it can detect the torque generated by motor shaft 61 about its central axis J.

[0052] The control device 40 determines the target value of the steering reaction force generated by the steering wheel 103 based on the outputs from the rotation sensor 82 and the torque sensor 85, and controls the motor 20 based on the target value. The control device 40 detects the steering angle θ of the steering wheel 103 based on the outputs from the rotation sensor 82 and the torque sensor 85, and sends a signal to the steering-side control device 108 based on the steering angle θ.

[0053] The adjustment mechanism 30 can adjust the position of the steering wheel 103. Although the figure is omitted, the adjustment mechanism 30 includes, for example, a telescopic mechanism that can adjust the axial (D1 axis direction) position of the steering wheel 103 and a tilting mechanism that can adjust the angle of the steering wheel 103 relative to the horizontal direction. The tilting mechanism can adjust the vertical (Z axis direction) position of the steering wheel 103 by changing the angle of the central axis J relative to the horizontal direction.

[0054] The adjustment mechanism 30 is located on the opposite side of the motor 20's axial direction (-D1 side). The adjustment mechanism 30 is fixed to the housing 50 of the motor 20. In this embodiment, the motor 20 is positioned between the steering wheel 103 and the adjustment mechanism 30's axial direction. For example, when the adjustment mechanism 30 is positioned between the motor 20 and the steering wheel 103's axial direction, it is necessary to have the motor shaft 61 pass through the adjustment mechanism 30 axially, or to connect the adjustment mechanism 30 to the motor shaft 61, which may lead to problems such as an increase in the number of components in the adjustment mechanism 30 and a more complex connection structure. In contrast, in this embodiment, the motor 20 is positioned between the steering wheel 103 and the adjustment mechanism 30's axial direction. Therefore, it is not necessary to have the motor shaft 61 pass through the adjustment mechanism 30 axially, nor is it necessary to connect the adjustment mechanism 30 to the motor shaft 61. As a result, an increase in the number of components in the adjustment mechanism 30 can be suppressed, and a more complex connection structure can be suppressed. Therefore, it is easier to miniaturize the adjustment mechanism 30 and to further miniaturize the steering device 101 axially.

[0055] The adjustment mechanism 30 can adjust the position of the steering wheel 103 by moving the position of the motor 20 connected to the steering wheel 103. Therefore, the position of the steering wheel 103 can be adjusted together with the motor 20 via the adjustment mechanism 30. As a result, the position of the steering wheel 103 can be easily adjusted via the adjustment mechanism 30. Furthermore, compared to adjusting the position of the steering wheel 103 without moving the motor 20, it is easier to prevent the structural complexity of the adjustment mechanism 30. Therefore, it is easier to make the adjustment mechanism 30 more compact, and it is easier to further miniaturize the steering device 101 in the axial direction.

[0056] Hereinafter, embodiments different from the embodiments described above will be described. In the following descriptions of each embodiment, for configurations identical to those described earlier in the preceding descriptions of the embodiments, descriptions are sometimes omitted by appropriately using the same reference numerals, etc. Furthermore, for parts corresponding to each component of the configuration described earlier in the preceding descriptions of the embodiments, the same names are used, but different reference numerals are used. Points that differ from the above configurations will be described, while points identical to the above configurations will sometimes be omitted. It should be noted that configurations omitted in the following embodiments may be identical to those described earlier in the preceding descriptions of the embodiments, provided there is no contradiction.

[0057] <Second Implementation Method>

[0058] like Figure 3As shown, in the actuator 210 of the steering device 201 of this embodiment, the cylindrical portion 252 of the housing 250 of the motor 220 is cylindrical with openings on both axial sides. Therefore, compared to the case where the housing 250 has portions that block the axial ends of the cylindrical portion 252, it is easier to miniaturize the housing 250 in the axial direction. This makes it easier to further miniaturize the steering device 201 in the axial direction. The housing 250 differs from the housing 50 in the first embodiment in that it does not have a cover portion 51 and a bottom portion 53. In this embodiment, the housing 250 is composed of the cylindrical portion 252.

[0059] The cylindrical portion 252 has a small-diameter portion 252a and a large-diameter portion 252b. The end face of the small-diameter portion 252a on one axial side (+D1 side) is the end face of the cylindrical portion 252 on one axial side. A first stator 71 and a second stator 72 are fixed to the inner circumferential surface of the small-diameter portion 252a. In this embodiment, the end face of the small-diameter portion 252a on one axial side, i.e., the end face of the cylindrical portion 252 on one axial side, is located at the same position axially as the end face of the first stator 71 on one axial side. The large-diameter portion 252b is connected to the end face of the small-diameter portion 252a on the other axial side (-D1 side). The end face of the large-diameter portion 252b on the other axial side is the end face of the cylindrical portion 252 on the other axial side. The inner diameter of the large-diameter portion 252b is larger than the inner diameter of the small-diameter portion 252a. The outer diameter of the large-diameter portion 252b is larger than the outer diameter of the small-diameter portion 252a. The axial dimension of the larger diameter portion 252b is smaller than that of the smaller diameter portion 252a. A stepped portion 252d is provided between the outer peripheral surface of the smaller diameter portion 252a and the outer peripheral surface of the larger diameter portion 252b in the axial direction. This stepped portion 252d has a stepped surface 252c facing one side of the axial direction. The stepped surface 252c is annular about the central axis J.

[0060] The cylindrical portion 252 is cylindrical with an opening 252e, which opens on the side where the axial adjustment mechanism 230 is located, i.e., the other side (-D1 side). The opening 252e is the opening on the other side of the axial diameter portion 252b. The opening 252e is blocked by the adjustment mechanism 230. By configuring it in this way to block the opening 252e by the adjustment mechanism 230, the adjustment mechanism 230 can be brought closer to the motor 220 in the axial direction. As a result, the steering device 201 can be further miniaturized in the axial direction. In this embodiment, the adjustment mechanism housing 231 of the adjustment mechanism 230 has a top wall portion 232, a peripheral wall portion 233, and a fitting portion 234.

[0061] The top wall portion 232 is a circular plate centered on the central axis J. The axial side (+D1 side) of the top wall portion 232 faces the interior of the outer casing 250. The sensor substrate 281 of the rotation detection device 280 is fixed to the axial side of the top wall portion 232. The rotation detection device 280 is identical to the rotation detection device 80 in the first embodiment, except that the sensor substrate 281 is fixed to the top wall portion 232.

[0062] The peripheral wall portion 233 extends from the radial outer edge of the top wall portion 232 to the other axial side (-D1 side). The fitting portion 234 protrudes from the top wall portion 232 to one axial side (+D1 side). The fitting portion 234 is cylindrical with the central axis J as its center. The fitting portion 234 fits into the radial inner side of the large diameter portion 252b. In other words, the fitting portion 234 fits into the opening portion 252e. In this way, by fitting a part of the adjusting mechanism 230 into the opening portion 252e, the adjusting mechanism 230 can be easily connected to the motor 220. Furthermore, the opening portion 252e of the cylindrical portion 252 can be blocked by the adjusting mechanism 230, and the adjusting mechanism 230 can be mounted to the housing 250 with good shaft precision. Furthermore, by configuring the cylindrical portion 252 to have an opening 252e, as described above, the adjustment mechanism 230 can be fitted into the opening 252e and connected to the motor 220 without using threaded members or the like. On the other hand, the adjustment mechanism 230 can also be fixed to the motor 220 using threaded members. In this way, according to this embodiment, the degree of freedom in the construction that can be used as the construction for fixing the adjustment mechanism 230 to the motor 220 can be increased. In addition, since an easy-to-assemble construction that matches the construction of the adjustment mechanism 230 to the motor 220 can be used as the construction for fixing the adjustment mechanism 230 to the motor 220, the assemblability of the actuator 210 can be improved.

[0063] In this embodiment, the bearing retainer 55 of the first embodiment is not provided in the motor 220. In this embodiment, the motor 220 includes a first bearing retaining member 256 and a second bearing retaining member 257. The first bearing retaining member 256 is located radially inside the first stator 71 and is fixed to the first stator 71. The second bearing retaining member 257 is located radially inside the second stator 72 and is fixed to the second stator 72. In this embodiment, the first bearing retaining member 256 and the second bearing retaining member 257 are symmetrical in shape along the axial direction. The materials constituting the first bearing retaining member 256 and the second bearing retaining member 257 are non-magnetic materials.

[0064] The first bearing retaining member 256 has a first peripheral wall portion 256a surrounding the central axis J and a first annular wall portion 256b protruding radially inward from one axial side (+D1 side) of the first peripheral wall portion 256a. The first peripheral wall portion 256a is cylindrical and opens on the other axial side (-D1 side) with the central axis J as the center. The first peripheral wall portion 256a fits into the radially inner side of the first stator 71. The outer peripheral surface of the first peripheral wall portion 256a contacts the radially inner surface of the stator core 73 of the first stator 71. The first peripheral wall portion 256a is, for example, fixed to the stator core 73. In this embodiment, the axial dimension of the first peripheral wall portion 256a is the same as the axial dimension of the first stator 71. The first annular wall portion 256b is annular surrounding the motor shaft 61. The first annular wall portion 256b is annular with the central axis J as the center.

[0065] The second bearing retaining member 257 has a second peripheral wall portion 257a surrounding the central axis J and a second annular wall portion 257b protruding radially inward from the end of the second peripheral wall portion 257a on the other axial side (-D1 side). The second peripheral wall portion 257a is cylindrical and open on one axial side (+D1 side) with the central axis J as the center. The second peripheral wall portion 257a fits into the radially inner side of the second stator 72. The outer peripheral surface of the second peripheral wall portion 257a contacts the radially inner surface of the stator core 73 of the second stator 72. The second peripheral wall portion 257a is, for example, fixed to the stator core 73. The axial dimension of the second peripheral wall portion 257a is the same as the axial dimension of the second stator 72. The second annular wall portion 257b is annular surrounding the motor shaft 61. The second annular wall portion 257b is annular with the central axis J as the center.

[0066] In this embodiment, at least a portion of the bearing 263 is located radially inside the stator 70. Therefore, compared to a case where the bearing 263 is entirely positioned at a different axial position from the stator 70, the motor 220 can be axially miniaturized. This allows for further axial miniaturization of the steering device 201. In this embodiment, the bearing 263 includes a first bearing 263a and a second bearing 263b. The first bearing 263a is a rotatable bearing 263 supporting a portion of the motor shaft 61 located on the axially side (+D1 side) of the rotor body 62. The second bearing 263b is a rotatable bearing 263 supporting a portion of the motor shaft 61 located on the axially opposite side (-D1 side) of the rotor body 62.

[0067] In this embodiment, at least a portion of the first bearing 263a is located radially inside the first stator 71. At least a portion of the second bearing 263b is located radially inside the second stator 72. Therefore, at least a portion of each of the two bearings 263 can be arranged radially inside the stator 70. As a result, the motor 220 and the steering device 201 can be further miniaturized axially.

[0068] In this embodiment, the first bearing 263a is entirely located radially inside the first stator 71. The second bearing 263b is entirely located radially inside the second stator 72. Therefore, both bearings 263 can be integrally positioned radially inside the stator 70. This allows for further axial miniaturization of the motor 220 and the steering device 201. In this embodiment, the first bearing 263a is held by the first bearing retaining member 256. The second bearing 263b is held by the second bearing retaining member 257. Therefore, each bearing 263 can be stably positioned radially inside the stator 70. Furthermore, since the first bearing 263a and the second bearing 263b are respectively held on the stator 70, when the rotor body 62 and the first bearing 263a and the second bearing 263b are pressed into and fixed to the motor shaft 61, the position of the stator 70 and the relative positional relationship between the stator 70 and the rotor body 62 can be determined simply by adjusting the axial position and spacing of the rotor body 62 and the first bearing 263a and the second bearing 263b. Moreover, this makes it easy to optimize the axial air gap between the rotor body 62 and the stator 70.

[0069] The first bearing 263a is supported from one axial side (+D1 side) by the first annular wall portion 256b. The second bearing 263b is supported from the other axial side (-D1 side) by the second annular wall portion 257b. The other configurations of the bearing 263 are the same as those of the bearing 63 in the first embodiment. The other configurations of the motor 220 are the same as those of the motor 20 in the first embodiment.

[0070] In this embodiment, the end of the control device 240 on the other axial side (-D1 side) contacts the stepped surface 252c. This allows the control device 240 to be positioned axially relative to the housing 250. More specifically, the end of the housing 242 of the control device 240 on the other axial side contacts the stepped surface 252c. The other configurations of the control device 240 are the same as those of the control device 40 in the first embodiment.

[0071] The other configurations of actuator 210 are the same as those of actuator 10 in the first embodiment. The other configurations of steering device 201 are the same as those of steering device 101 in the first embodiment.

[0072] <Third Implementation Method>

[0073] like Figure 4 As shown, in the actuator 310 of the steering device 301 of this embodiment, the housing 350 of the motor 320 has a bottom member 353. The bottom member 353 closes the opening 252e on the other axial side (-D1 side) of the cylindrical portion 352. The cylindrical portion 352 is the same as the cylindrical portion 252 of the second embodiment, except that the through holes 52c, 52d, and 52e are not provided in the small diameter portion 352a. The bottom member 353 is fixed to the cylindrical portion 352. The bottom member 353 has: a bottom wall portion 353a that closes the opening 252e; and a fitting portion 353b that protrudes from the bottom wall portion 353a to one axial side (+D1 side). The fitting portion 353b is annular about the central axis J. The fitting portion 353b fits into the opening 252e.

[0074] In this embodiment, the motor 320 has a portion located radially outward from the adjustment mechanism 330. In this embodiment, the radial dimension of the adjustment mechanism 330 is smaller than that of the adjustment mechanism 30 in the first embodiment. In this embodiment, at least a portion of the control device 340 is located radially outward from the adjustment mechanism 330 and overlaps axially with the portion of the motor 320 located radially outward from the adjustment mechanism 330. Therefore, compared to the case where the control device 340 is arranged axially with the motor 320 or the adjustment mechanism 330, the actuator 310 can be miniaturized axially. This allows for further miniaturization of the steering device 301 axially. Furthermore, since the control device 340 can be positioned at the stepped portion between the motor 320 and the adjustment mechanism 330, radial enlargement of the actuator 310 can be suppressed. Therefore, radial enlargement of the steering device 301 can be suppressed. In this embodiment, the entire control device 340 is located radially outward of the adjustment mechanism 330, and overlaps axially with the portion of the motor 320 located radially outward of the adjustment mechanism 330. Therefore, the actuator 310 can be further miniaturized axially and radially. The other configurations of the motor 320 are the same as those of the motor 220 in the second embodiment.

[0075] The control device 340 is located on the orthogonal side (+D2 side) of the adjustment mechanism 330. The control device 340 is fixed to the axial side (-D1 side) of the portion of the motor 320 that is on the orthogonal side of the adjustment mechanism 330. In this embodiment, the control device 340 is fixed to the bottom wall portion 353a. The plate surface of the substrate 341 of the control device 340 faces radially. In this embodiment, the plate surface of the substrate 341 faces the orthogonal direction (D2 axis direction). The housing 342 that internally houses the substrate 341 is fixed to the portion of the bottom wall portion 353a located radially outward from the adjustment mechanism 330. More specifically, the housing 342 is fixed to the portion of the bottom wall portion 353a located on the orthogonal side of the adjustment mechanism 330. The substrate 341 is electrically connected to the coil 74 of the first stator 71 and the coil 74 of the second stator 72 respectively through a plurality of conductive portions 374a passing through the through hole 353c provided in the bottom wall portion 353a. The substrate 341 is electrically connected to the sensor substrate 81 via a wiring 384 passing through the through hole 353c. In this embodiment, the sensor substrate 81 is fixed to the axial side (+D1 side) of the bottom wall portion 353a.

[0076] The other configurations of actuator 310 are the same as those of actuator 210 in the second embodiment. The other configurations of steering device 301 are the same as those of steering device 201 in the second embodiment.

[0077] <Fourth Implementation Method>

[0078] like Figure 5 As shown, in the actuator 410 of the steering device 401 of this embodiment, the motor 420 has only one stator 470. The stator 470 is the same as the stator 70 in the first embodiment. In the rotor 460 of this embodiment, the rotor body 462 includes a first rotor body 462a and a second rotor body 462b. The first rotor body 462a is located on one axial side (+D1 side) of the stator 470. The second rotor body 462b is located on the other axial side (-D1 side) of the stator 470. In this way, by setting the motor 420 as a motor with an axial gap between two rotor bodies 462 and one stator 470, the torque density can be increased compared to the case of a motor with an axial gap between two stators 470 and one rotor body 462. The first rotor body 462a and the second rotor body 462b are axially separated by the stator 470. The first rotor body 462a and the second rotor body 462b are the same as the rotor body 62 in the first embodiment, except that their respective axial positions are different.

[0079] The control device 440 is identical to the control device 40 in the first embodiment, except that the base plate 41 is electrically connected to the coil 74 of a stator 470. The other configurations of the motor 420 are identical to those of the motor 20 in the first embodiment. The other configurations of the actuator 410 are identical to those of the actuator 10 in the first embodiment. The other configurations of the steering device 401 are identical to those of the steering device 101 in the first embodiment.

[0080] <Fifth Implementation Method>

[0081] like Figure 6 As shown, in the actuator 510 of the steering device 501 of this embodiment, the motor 520, like in the fourth embodiment, includes two rotor bodies 462 and a stator 470. In this embodiment, the bearing cage 55 of the first embodiment is not provided in the motor 520. The motor 520 includes a second bearing retainer 557. The second bearing retainer 557 is located radially inward of the stator 470. The construction of the second bearing retainer 557 is the same as that of the second bearing retainer 257 in the second embodiment. The second bearing retainer 557 has: a cylindrical second peripheral wall portion 557a, which opens on one axial side (+D1 side); and a second annular wall portion 557b, which protrudes radially inward from the end of the second peripheral wall portion 557a on the other axial side (-D1 side).

[0082] The second bearing 563b is held by the second bearing retaining member 557. At least a portion of the second bearing 563b is located radially inside the stator 470. More specifically, the entire second bearing 563b is located radially inside the stator 470. That is, in this embodiment, only the second bearing 563b of the first bearing 63a and the second bearing 563b is located radially inside the stator 470, and the first bearing 63a is axially offset relative to the stator 470. Even in this case, compared to the case where both the first bearing 63a and the second bearing 563b are axially offset relative to the stator 470, the steering device 501 can be miniaturized in the axial direction. The other configurations of the second bearing 563b are the same as those of the second bearing 263b in the second embodiment.

[0083] The other configurations of motor 520 are the same as those of motor 420 in the fourth embodiment. The other configurations of actuator 510 are the same as those of actuator 410 in the fourth embodiment. The other configurations of steering device 501 are the same as those of steering device 401 in the fourth embodiment.

[0084] This invention is not limited to the embodiments described above. Other configurations and methods can be employed within the scope of the technical concept of this invention. The number of bearings supporting the motor shaft for rotation is not particularly limited, as long as there is one or more. The type of bearing is not particularly limited. When a first bearing and a second bearing are provided, the first bearing and the second bearing may each be located only partially within the radial direction of the stator. The first bearing and the second bearing may also be directly held to the stator without bearing retaining members. At least a portion of the first bearing and at least a portion of the second bearing may be located within the same radial direction of the stator. The control device can be located in any position. The adjustment mechanism can be any mechanism as long as it can adjust the position of the steering wheel. The adjustment mechanism may also have only one of the telescopic mechanism and tilting mechanism described above. The central axis can extend in any direction.

[0085] It should be noted that this technology can be configured as follows. (1) A motor, which is a motor provided in a steering device of a vehicle with a steer-by-wire method, and which generates a steering reaction force on the steering wheel of the vehicle, the motor having: a rotor rotatable about a central axis; and a stator opposed to the rotor with a gap, the rotor having: a motor shaft extending axially along the central axis; and a rotor body fixed to the motor shaft, the stator and the rotor body being axially opposed, the motor shaft being directly connected to the steering wheel. (2) The motor according to (1), wherein the motor has a bearing supporting the rotor as rotatable, the stator being annular surrounding the motor shaft, at least a portion of the bearing being located radially inside the stator. (3) The motor according to (1) or (2), wherein the stator includes: a first stator located on one axial side of the rotor body; and a second stator located on the other axial side of the rotor body. (4) The motor according to (3) comprises: a first bearing supporting a portion of the motor shaft located on an axial side relative to the rotor body for rotation; and a second bearing supporting a portion of the motor shaft located on an axial side relative to the rotor body for rotation, wherein the first stator is an annular shape surrounding the portion of the motor shaft located on an axial side relative to the rotor body, and the second stator is an annular shape surrounding the portion of the motor shaft located on an axial side relative to the rotor body, wherein at least a portion of the first bearing is located radially inside the first stator, and at least a portion of the second bearing is located radially inside the second stator. (5) The motor according to (4), wherein the entire first bearing is located radially inside the first stator, and the entire second bearing is located radially inside the second stator. (6) The motor according to (4) or (5) comprises: a first bearing retaining member located radially inside the first stator and fixed to the first stator; and a second bearing retaining member located radially inside the second stator and fixed to the second stator, wherein the first bearing is retained in the first bearing retaining member, and the second bearing is retained in the second bearing retaining member. (7) The motor according to (1) or (2), wherein the rotor body comprises: a first rotor body located on one axial side of the stator; and a second rotor body located on the other axial side of the stator. (8) The motor according to any one of (1) to (7), wherein the motor includes a cylindrical portion that holds the stator inside, the cylindrical portion being cylindrical with openings on both axial sides, and the stator being fixed to the inner circumferential surface of the cylindrical portion.(9) An actuator comprising: a motor according to any one of (1) to (7); and an adjustment mechanism capable of adjusting the position of the steering wheel, the motor having a cylindrical portion holding the stator inside, and the motor being disposed axially between the steering wheel and the adjustment mechanism, the cylindrical portion being cylindrical with an opening on the side where the adjustment mechanism is located in the axial direction, the opening being blocked by the adjustment mechanism. (10) An actuator comprising: a motor according to any one of (1) to (8); and an adjustment mechanism capable of adjusting the position of the steering wheel, the motor being disposed axially between the steering wheel and the adjustment mechanism. (11) The actuator according to (10), wherein the adjustment mechanism is capable of adjusting the position of the steering wheel by moving the position of the motor connected to the steering wheel. (12) The actuator according to (10) or (11), wherein the actuator comprises a control device electrically connected to the stator, the control device being located radially outward of the motor. (13) The actuator according to (12), wherein the motor has a conductive portion electrically connected to the stator, the control device has a base plate with its plate surface facing radially, the conductive portion extending radially outward from the stator and connected to the base plate. (14) The actuator according to (10) or (11), wherein the actuator has a control device electrically connected to the stator, the motor has a portion located radially outward from the adjustment mechanism, at least a portion of the control device is located radially outward from the adjustment mechanism, and overlaps axially with the portion of the motor located radially outward from the adjustment mechanism. (15) A steering device, a steering device of a steer-by-wire type mounted on a vehicle, the steering device comprising: a steering mechanism having a steering wheel and an actuator according to any one of (9) to (14) for applying force to the steering wheel; and a steering mechanism driven based on the steering angle of the steering wheel.

[0086] Furthermore, the configurations and methods described in this specification can be appropriately combined to the extent that they do not contradict each other.

[0087] Explanation of reference numerals in the attached figures

[0088] 10, 210, 310, 410, 510: Actuators; 20, 220, 320, 420, 520: Motors; 30, 230, 330: Adjustment mechanisms; 40, 240, 340, 440: Control devices; 41, 341: Base plates; 52, 252, 352: Cylindrical sections; 60, 460: Rotors; 61: Motor shaft; 62, 462: Rotor bodies; 63, 263: Bearings; 63a, 263a: First bearings; 63b, 263b, 563b : Second bearing; 70, 470: Stator; 71: First stator; 72: Second stator; 74a, 374a: Conductive part; 100: Steering device; 101, 201, 301, 401, 501: Steering device; 102: Steering wheel; 103: Steering wheel; 252e: Opening; 256: First bearing retaining member; 257, 557: Second bearing retaining member; 462a: First rotor body; 462b: Second rotor body; J: Central axis; θ: Steering angle.

Claims

1. A motor, which is included in a steering device of a steer-by-wire system of a vehicle, and generates a steering reaction force on the steering wheel of the vehicle, the motor comprising: The rotor is capable of rotating about its central axis; and The stator is positioned opposite the rotor with a gap between them. The rotor has: The motor shaft extends axially along the central axis; and The rotor body is fixed to the motor shaft. The stator and the rotor body are axially opposed to each other. The motor shaft is directly connected to the steering wheel.

2. The motor according to claim 1, wherein, The motor includes bearings that support the rotor so that it can rotate. The stator is an annular shape surrounding the motor shaft. At least a portion of the bearing is located radially inside the stator.

3. The motor according to claim 1, wherein, The stator includes: The first stator is located on one axial side of the rotor body; and The second stator is located on the other side of the rotor body along its axial direction.

4. The motor according to claim 3, comprising: A first bearing supports a portion of the motor shaft located on the axially side relative to the rotor body, enabling it to rotate; and The second bearing supports the portion of the motor shaft located on the axially opposite side compared to the rotor body, enabling it to rotate. The first stator is an annular structure surrounding the portion of the motor shaft located on the axial side relative to the rotor body. The second stator is an annular structure surrounding the portion of the motor shaft located on the opposite side of the rotor body in the axial direction. At least a portion of the first bearing is located radially inside the first stator. At least a portion of the second bearing is located radially inside the second stator.

5. The motor according to claim 4, wherein, The entire first bearing is located radially inside the first stator. The entire second bearing is located radially inside the second stator.

6. The motor according to claim 4, comprising: A first bearing retaining member is located radially inside the first stator and fixed to the first stator; and The second bearing retaining member is located radially inside the second stator and is fixed to the second stator. The first bearing is held in the first bearing retaining member. The second bearing is held in the second bearing holding member.

7. The motor according to claim 1, wherein, The rotor body includes: The first rotor body is located on one axial side of the stator; and The second rotor body is located on the other side of the stator along its axial direction.

8. The motor according to claim 1, wherein, The motor includes a cylindrical portion that holds the stator inside. The cylindrical portion is a cylindrical shape with openings on both axial sides. The stator is fixed to the inner circumferential surface of the cylindrical part.

9. An actuator comprising: The motor according to any one of claims 1 to 7; and The adjustment mechanism can adjust the position of the steering wheel. The motor has a cylindrical portion that holds the stator inside, and the motor is positioned axially between the steering wheel and the adjustment mechanism. The cylindrical portion is a cylindrical shape with an opening on the side where the adjustment mechanism is located in the axial direction. The opening is blocked by the adjustment mechanism.

10. An actuator comprising: The motor according to any one of claims 1 to 8; and The adjustment mechanism can adjust the position of the steering wheel. The motor is positioned axially between the steering wheel and the adjustment mechanism.

11. The actuator according to claim 10, wherein, The adjustment mechanism can adjust the position of the steering wheel by moving the position of the motor connected to the steering wheel.

12. The actuator according to claim 10, wherein, The actuator includes a control device electrically connected to the stator. The control device is located radially outside the motor.

13. The actuator according to claim 12, wherein, The motor has a conductive part that is electrically connected to the stator. The control device has a substrate with its surface facing radially. The conductive portion extends radially outward from the stator and is connected to the substrate.

14. The actuator according to claim 10, wherein, The actuator includes a control device electrically connected to the stator. The motor has a portion located radially outward from the adjustment mechanism. At least a portion of the control device is located radially outside the adjustment mechanism and overlaps axially with a portion of the motor located radially outside the adjustment mechanism.

15. A steering device, which is a steer-by-wire steering system mounted on a vehicle, comprising: Steering mechanism, comprising a steering wheel and an actuator according to claim 10 for applying force to said steering wheel; and The steering mechanism is driven based on the steering angle of the steering wheel.

Images