JP6673142B2 - Rotary drive device and shift-by-wire system using the same - Google Patents

Description

  The present invention relates to a rotary drive capable of outputting torque and a shift-by-wire system using the same.

  2. Description of the Related Art Conventionally, in a shift range switching device of an automobile, a shift range selected by a driver is detected by an electronic control device, a drive control of a rotary driving device is performed according to the detected value, and a shift-by-wire system for switching a shift range of an automatic transmission. It has been known.

JP 2010-203543 A Japanese Patent No. 5648564

  In the shift-by-wire system of Patent Literature 1, the output of the rotary drive device is connected to the shift range switching device of the automatic transmission, and the shift range of the automatic transmission can be switched by the torque output from the output unit. The rotary drive device is provided with a resin rotary member having external teeth that mesh with the external teeth of the output unit. Then, a magnet is provided on the rotating member, and by detecting a magnetic flux from the magnet, the rotational position of the rotating member is detected, and the rotational position of the output unit and the shift position of the shift range switching device are indirectly detected. . Therefore, there is a possibility that the detection accuracy of the rotational position of the output unit may be reduced due to play between the output unit and the rotating member.

  In the shift-by-wire system of Patent Document 1, the output unit is formed of a magnetic material such as iron from the viewpoint of strength. Here, in order to directly detect the rotational position of the output unit, if a magnet is provided in the output unit, the magnetic flux from the magnet may flow to the output unit, and the density of the detected magnetic flux may decrease. In this case, the detection accuracy of the rotational position of the output unit may be reduced.

In the rotary drive device disclosed in Patent Document 2, a rotary electric machine is provided on a front housing side of a housing for housing the rotary electric machine, and a speed reducer is provided on a rear housing side. The torque of the rotating electric machine is reduced by a speed reducer as a gear mechanism, and is output to a manual shaft of a shift range switching device via an output unit. It is considered that the rotary drive device is provided such that the rear housing faces or abuts the outer wall of the shift range switching device. Here, the speed reducer is provided so as to protrude from the center of the rotating electric machine toward the shift range switching device. Therefore, a substantially annular dead space may be formed between the outer wall of the rear housing around the speed reducer and the outer wall of the shift range switching device. Therefore, the mountability of the rotary drive may be reduced.
Further, in the rotary drive device of Patent Document 2, when a magnetic flux density detecting unit for detecting the rotational position of the output unit is provided on the front housing side, the magnetic flux density detecting unit is arranged at a position close to the rotating electric machine. . Therefore, there is a possibility that the detection accuracy of the rotational position of the output unit may be reduced due to the magnetic flux leakage from the rotating electric machine. On the other hand, when the magnetic flux density detection unit is provided on the rear housing side far from the rotary electric machine, the dead space described above may further increase, and the mountability of the rotary driving device may further decrease.

  The present invention has been made in view of the above-described problems, and has as its object to provide a rotation drive device having high detection accuracy of a rotational position of an output unit and high mountability, and a shift-by-wire system using the same. Is to do.

The rotary drive device (1) of the present invention includes a housing (10), a rotating electric machine (3), an output gear (81), an output unit (86), a yoke (90), a first magnetic flux generation unit (93), and a second. A magnetic flux generator (94), a magnetic flux density detector (141), and first holes (811, 812, 813) are provided.
The rotating electric machine is provided in the housing.
The output gear is formed of a magnetic material, and rotates by a torque output from the rotating electric machine.
The output unit is provided integrally with the output gear so that the shaft (Ax2) coincides with the rotation center (C1) of the output gear, and rotates together with the output gear.

The yoke is provided in the output gear, and forms a first yoke (91) and an arc-shaped gap (S1) along an arc (Arc1) around the rotation center of the output gear between the first yoke. It has a second yoke (92).
The first magnetic flux generator (93) is provided between one end of the first yoke and one end of the second yoke.
The second magnetic flux generator (94) is provided between the other end of the first yoke and the other end of the second yoke.
The magnetic flux density detector is provided in the housing so as to be relatively movable with respect to the yoke in the arc-shaped gap, and outputs a signal corresponding to the density of the magnetic flux passing therethrough.
The first hole is formed between the rotation center of the output gear and the yoke so as to penetrate the output gear in the thickness direction.

  According to the present invention, the magnetic flux generated from the first magnetic flux generating section and the second magnetic flux generating section flows through the first yoke and the second yoke, and becomes a leakage magnetic flux through the arc-shaped gap between the first yoke and the second yoke. jump. The magnetic flux density detection unit outputs a signal corresponding to the density of the leakage magnetic flux flying through the arc gap. Thus, the relative position of the yoke with respect to the magnetic flux density detecting section can be detected, and the rotational position of the output section can be detected.

  The magnetic flux generated from the first magnetic flux generation unit and the second magnetic flux generation unit also flows to the output gear formed of a magnetic material. In the present invention, the first hole is formed between the rotation center of the output gear and the yoke, that is, at a specific location of the output gear. Therefore, the path of the magnetic flux flowing through the output gear can be reduced. Thereby, the magnetic flux flowing through the output gear can be reduced. Therefore, the density of the leakage magnetic flux flying in the arc-shaped gap can be increased. Therefore, the detection accuracy of the rotational position of the output unit can be improved.

The present invention relates to a rotary drive device (1) mounted on a mounting target (130) and capable of rotating and driving a driving target (101, 110), comprising a front housing (11), a rear housing (12), and a rotary electric machine ( 3), a gear mechanism (50), an output section (86), and a magnetic flux density detection section (141).
A space (5) is formed between the rear housing and the front housing, and a surface opposite to the front housing is provided so as to be able to face or abut the mounting object.
The rotating electric machine is provided on the rear housing side of the space.
The gear mechanism is provided on the front housing side with respect to the rotating electric machine in the space, and can transmit torque of the rotating electric machine.
The output unit is provided radially outside the rotating electric machine, has a connection unit (861) on the attachment target side that can be connected to the drive target, and outputs the torque transmitted by the gear mechanism to the drive target.
The magnetic flux density detecting unit is provided on the front housing side so as to be rotatable relative to the output unit, and outputs a signal corresponding to the density of the magnetic flux passing therethrough.

In the present invention, the gear mechanism is provided on the front housing side with respect to the rotating electric machine. Therefore, the rear housing provided on the side opposite to the gear mechanism with respect to the rotating electric machine can have a flat shape. Thus, when the rotary drive device is mounted on the mounting target, a dead space that can be formed between the rear housing and the mounting target can be reduced. Therefore, the mountability of the rotation drive device can be improved.
Further, in the present invention, the magnetic flux density detecting section is provided on the front housing side. That is, the magnetic flux density detection unit can be provided on the side opposite to the rotating electric machine with respect to the gear mechanism. Therefore, the distance between the magnetic flux density detection unit and the rotating electric machine can be increased. Thereby, it is possible to suppress the leakage magnetic flux from the rotating electric machine from affecting the magnetic flux density detection unit. Therefore, the accuracy of detecting the rotational position of the output unit by the magnetic flux density detecting unit can be improved.
Further, in the present invention, since the magnetic flux density detecting unit is provided on the front housing side, compared to a case where the magnetic flux density detecting unit is provided on the rear housing side, an increase in dead space that can be formed between the rear housing and the mounting target is reduced. It can be further suppressed.
The first aspect of the present invention further includes an output gear (81). The output gear is provided so as to be rotatable integrally with the output unit on the side opposite to the rear housing with respect to the rotary electric machine in the axial direction of the output unit, and rotates by the torque transmitted by the gear mechanism. The magnetic flux density detection unit is provided on the opposite side of the rotating electric machine with respect to the output gear in the axial direction of the output unit.
In the second aspect of the present invention, the magnetic flux density detecting section is provided on the axis of the output section.
A third aspect of the present invention further comprises a forced drive shaft (160). The forced drive shaft is provided on the axis of the output unit on the opposite side to the connection unit, and can forcibly rotate the output unit when torque is input.

FIG. 2 is a cross-sectional view illustrating the rotary drive device according to the first embodiment of the present invention. FIG. 1 is a schematic diagram showing a shift-by-wire system to which a rotation drive device according to a first embodiment of the present invention is applied. FIG. 3 is a view of a part of the rotary drive device according to the first embodiment of the present invention as viewed from the direction of arrow III in FIG. FIG. 6 is a sectional view showing a rotary drive device according to a second embodiment of the present invention. The figure which looked at FIG. 4 from the arrow V direction. Sectional drawing which shows the rotary drive by 3rd Embodiment of this invention.

Hereinafter, a rotary drive device according to a plurality of embodiments of the present invention will be described with reference to the drawings. In a plurality of embodiments, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(1st Embodiment)
The rotary actuator 1 as a rotary drive device shown in FIG. 1 is applied, for example, as a drive unit of a shift-by-wire system that switches a shift of an automatic transmission of a vehicle.

  First, the shift-by-wire system will be described. As shown in FIG. 2, the shift-by-wire system 100 includes a rotary actuator 1, an electronic control unit (hereinafter, referred to as “ECU”) 2, a shift range switching device 110, a parking switching device 120, and the like. The rotary actuator 1 rotationally drives the manual shaft 101 of the shift range switching device 110 to be driven. As a result, the shift range of the automatic transmission 108 is switched. The rotation of the rotary actuator 1 is controlled by the ECU 2. The rotary actuator 1 is attached to, for example, a wall 130 of a shift range switching device 110 to be attached. The rotary actuator 1 drives the park rod 121 and the like of the parking switching device 120 by rotating and driving the manual shaft 101 of the shift range switching device 110.

  The shift range switching device 110 includes a manual shaft 101, a detent plate 102, a hydraulic valve body 104, a wall 130, and the like. The wall 130 houses the manual shaft 101, the detent plate 102, the hydraulic valve body 104, and the like. The manual shaft 101 is provided such that one end protrudes from the wall 130 via a hole 131 (see FIG. 1) formed in the wall 130.

  One end of the manual shaft 101 is spline-coupled to the output portion 86 of the rotary actuator 1 (described later). The detent plate 102 is formed in a fan shape extending radially outward from the manual shaft 101, and rotates integrally with the manual shaft 101. The detent plate 102 is provided with a pin 103 projecting parallel to the manual shaft 101.

  The pin 103 is locked to an end of a manual spool valve 105 provided on the hydraulic valve body 104. Therefore, the manual spool valve 105 reciprocates in the axial direction by the detent plate 102 that rotates integrally with the manual shaft 101. The manual spool valve 105 switches the hydraulic supply path to the hydraulic clutch of the automatic transmission 108 by reciprocating in the axial direction. As a result, the engagement state of the hydraulic clutch is switched, and the shift range of the automatic transmission 108 is changed.

  The detent plate 102 has a concave portion 151, a concave portion 152, a concave portion 153, and a concave portion 154 at a radial end. The recesses 151 to 154 correspond to, for example, a P range, an R range, an N range, and a D range, which are shift ranges of the automatic transmission 108, respectively. The position of the manual spool valve 105 in the axial direction is determined by the engagement of the stopper 107 supported at the distal end of the leaf spring 106 with any of the concave portions 151 to 154 of the detent plate 102.

  When torque is applied to the detent plate 102 from the rotary actuator 1 via the manual shaft 101, the stopper 107 moves to another adjacent recess (one of the recesses 151 to 154). As a result, the axial position of the manual spool valve 105 changes.

  For example, when the manual shaft 101 is rotated clockwise as viewed from the arrow Y direction in FIG. 2, the pin 103 pushes the manual spool valve 105 into the hydraulic valve body 104 via the detent plate 102, and the hydraulic valve body 104 Are switched in the order of D, N, R, and P. As a result, the shift range of the automatic transmission 108 is switched in the order of D, N, R, and P.

On the other hand, when the manual shaft 101 is rotated counterclockwise, the pin 103 pulls out the manual spool valve 105 from the hydraulic valve body 104, and the oil passage in the hydraulic valve body 104 is switched in the order of P, R, N, and D. . As a result, the shift range of the automatic transmission 108 is switched in the order of P, R, N, and D.
As described above, the rotation angle of the manual shaft 101 rotationally driven by the rotary actuator 1, that is, the predetermined position in the rotation direction corresponds to each shift range of the automatic transmission 108.

  The parking switching device 120 includes a park rod 121, a park pole 123, a parking gear 126, and the like. The park rod 121 is formed in a substantially L shape, and the detent plate 102 is connected to one end. A conical portion 122 is provided at the other end of the park rod 121. By converting the rotational movement of the detent plate 102 into a linear movement by the park rod 121, the conical part 122 reciprocates in the axial direction. A park pole 123 is in contact with a side surface of the conical portion 122. Therefore, when the park rod 121 reciprocates, the park pole 123 is driven to rotate about the shaft 124.

  A protrusion 125 is provided in the rotation direction of the park pole 123. When the protrusion 125 meshes with the gear of the parking gear 126, the rotation of the parking gear 126 is restricted. As a result, the drive wheels are locked via a drive shaft or a differential gear (not shown). On the other hand, when the projection 125 of the park pole 123 is disengaged from the gear of the parking gear 126, the parking gear 126 becomes rotatable and the lock of the driving wheel is released.

Next, the rotary actuator 1 will be described.
As shown in FIG. 1, the rotary actuator 1 includes a housing 10, an input shaft 20, a motor 3 as a rotating electric machine, a speed reducer 50 as a gear mechanism, an output shaft 60, an output gear 81, an output section 86, a yoke 90, The magnet 93 as the first magnetic flux generating unit, the magnet 94 as the second magnetic flux generating unit, the Hall IC 141 as the magnetic flux density detecting unit, the first holes 811, 812, 813, the second holes 821, 822, 823, etc. Have.

  The housing 10 has a front housing 11, a rear housing 12, a middle housing 13, and a sensor housing 14. The rear housing 12, the middle housing 13, and the sensor housing 14 are formed of, for example, resin. The front housing 11 is formed of a metal such as aluminum, for example.

  The rear housing 12 is formed in a bottomed cylindrical shape. The middle housing 13 is formed in an annular shape, and is provided so as to contact the opening of the rear housing 12. The front housing 11 is provided so as to contact the middle housing 13 on the side opposite to the rear housing 12. The sensor housing 14 is provided so as to contact the front housing 11 on the side opposite to the middle housing 13. In the present embodiment, the rotary actuator 1 is attached to the wall 130 such that the surface of the rear housing 12 opposite to the front housing 11 faces the wall 130 of the shift range switching device 110.

  The rear housing 12 and the front housing 11 are fixed by bolts 4 with the middle housing 13 interposed therebetween. Thus, the space 5 is formed inside the rear housing 12, the middle housing 13, and the front housing 11.

Annular gaskets 6 and 7 made of rubber are sandwiched between a position where the rear housing 12 and the middle housing 13 are in contact with each other and a position where the middle housing 13 and the front housing 11 are in contact with each other. Therefore, the inside and the outside of the space 5 are kept airtight or liquidtight.
The sensor housing 14 is fixed to the front housing 11 by bolts 15.

  The input shaft 20 is formed of, for example, a metal. The input shaft 20 has one end 21, a large diameter part 22, an eccentric part 23, and another end 24. The one end 21, the large diameter portion 22, the eccentric portion 23, and the other end 24 are integrally formed so as to be arranged in this order in the direction of the axis Ax1.

  One end 21 is formed in a columnar shape. The large diameter portion 22 is formed in a columnar shape having an outer diameter larger than the one end portion 21 and is provided coaxially with the one end portion 21 (axis Ax1). The eccentric part 23 is formed in a cylindrical shape having an outer diameter smaller than that of the large diameter part 22, and is provided eccentric with respect to the axis Ax <b> 1 which is the rotation center of the input shaft 20. That is, the eccentric part 23 is provided eccentric with respect to the one end part 21 and the large diameter part 22. The other end 24 is formed in a cylindrical shape having an outer diameter smaller than that of the eccentric part 23, and is provided coaxially with the one end 21 and the large diameter part 22 (axis Ax1).

  The input shaft 20 is rotatably supported at the other end 24 by the front bearing 16 and at one end 21 by the rear bearing 17. In the present embodiment, the front bearing 16 and the rear bearing 17 are, for example, ball bearings.

  The front bearing 16 is provided inside an output shaft 60 described later. The output shaft 60 is rotatably supported by a metallic cylindrical metal bearing 18 provided inside the front housing 11. That is, the other end 24 of the input shaft 20 is rotatably supported via the metal bearing 18, the output shaft 60, and the front bearing 16 provided on the front housing 11. On the other hand, one end 21 of the input shaft 20 is rotatably supported via a rear bearing 17 provided at the center of the bottom of the rear housing 12. Thus, the input shaft 20 is rotatably supported by the housing 10.

The motor 3 as a rotating electric machine is a three-phase brushless motor that generates a driving force without using a permanent magnet. The motor 3 is provided on the rear housing 12 side of the space 5. That is, the motor 3 is provided so as to be housed in the housing 10. The motor 3 has a stator 30, a coil 33, and a rotor 40.
The stator 30 is formed in a substantially annular shape, and is fixed to the rear housing 12 so as to be non-rotatable by being pressed into the metal plate 8 insert-molded in the rear housing 12.

  The stator 30 is formed by laminating a plurality of thin plates made of a magnetic material such as iron in the thickness direction. Stator 30 has stator core 31 and stator teeth 32. Stator core 31 is formed in an annular shape. The stator teeth 32 are formed to protrude radially inward from the stator core 31. The plurality of stator teeth 32 are formed at equal intervals in the circumferential direction of the stator core 31. In the present embodiment, for example, twelve stator teeth 32 are formed.

  The coil 33 is provided so as to be wound around each of the plurality of stator teeth 32. The coil 33 is electrically connected to the bus bar 70. The bus bar 70 is provided at the bottom of the rear housing 12 as shown in FIG. The power supplied to the coil 33 flows through the bus bar 70. The bus bar portion 70 has a terminal 71 connected to the coil 33 on the radial inside of the coil 33 provided on the stator 30. The coil 33 is electrically connected to the terminal 71. Power is supplied to the terminal 71 based on the drive signal output from the ECU 2.

  The rotor 40 is provided radially inside the stator 30. The rotor 40 is formed by laminating a plurality of thin plates made of a magnetic material such as iron in the thickness direction. The rotor 40 has a rotor core 41 and salient poles 42. The rotor core 41 is formed in an annular shape and is press-fitted and fixed to the large-diameter portion 22 of the input shaft 20. The salient poles 42 are formed to protrude from the rotor core 41 toward the radially outer stator 30. A plurality of salient poles 42 are formed at equal intervals in the circumferential direction of the rotor core 41. In the present embodiment, for example, eight salient poles 42 are formed. The rotor 40 is rotatable relative to the housing 10 and the stator 30 by the rotor core 41 being press-fitted and fixed to the input shaft 20.

When electric power is supplied to the coil 33, a magnetic force is generated in the stator teeth 32 around which the coil 33 is wound. Thereby, the salient pole 42 of the corresponding rotor 40 is drawn to the stator teeth 32. The plurality of coils 33 constitute, for example, three phases of a U phase, a V phase, and a W phase. When the ECU 2 switches energization in the order of the U-phase, V-phase, and W-phase, the rotor 40 rotates in, for example, one direction in the circumferential direction. Rotate to the other. As described above, by switching the energization to each coil 33 and controlling the magnetic force generated in the stator teeth 32, the rotor 40 can be rotated in any direction.
In the present embodiment, a rotary encoder 72 is provided between the bottom of the rear housing 12 and the rotor core 41. The rotary encoder 72 has a magnet 73, a substrate 74, a Hall IC 75, and the like.

  The magnet 73 is a multi-pole magnet formed in an annular shape and having N and S poles alternately magnetized in the circumferential direction. The magnet 73 is arranged coaxially with the rotor core 41 at an end of the rotor core 41 on the rear housing 12 side. The board 74 is fixed to the inner wall at the bottom of the rear housing 12. The Hall IC 75 is mounted on the substrate 74 so as to face the magnet 73.

The Hall IC 75 has a Hall element and a signal conversion circuit. The Hall element is a magnetoelectric conversion element utilizing the Hall effect, and outputs an electric signal proportional to the density of the magnetic flux generated by the magnet 73. The signal conversion circuit converts the output signal of the Hall element into a digital signal. The Hall IC 75 outputs a pulse signal synchronized with the rotation of the rotor core 41 to the ECU 2 via the signal pin 76. The ECU 2 can detect the rotation angle and the rotation direction of the rotor core 41 based on the pulse signal from the Hall IC 75.
The speed reducer 50 has a ring gear 51 and a sun gear 52.

  The ring gear 51 is formed in a ring shape from a metal such as iron, for example. The ring gear 51 is non-rotatably fixed to the housing 10 by being pressed into the annular plate 9 insert-molded in the middle housing 13. Here, the ring gear 51 is fixed to the housing 10 so as to be coaxial with the input shaft 20 (axis Ax1). The ring gear 51 has internal teeth 53 formed on the inner edge.

  The sun gear 52 is formed in a substantially disk shape with a metal such as iron, for example. The sun gear 52 has a columnar projection 54 formed to project in a thickness direction from a position radially away from the center of one surface by a predetermined distance. The projections 54 are formed at equal intervals in the circumferential direction of the sun gear 52. In the present embodiment, nine projections 54 are formed, for example (see FIG. 3). Further, the sun gear 52 has external teeth 55 formed on the outer edge so as to mesh with the internal teeth 53 of the ring gear 51. The sun gear 52 is eccentrically provided to be rotatable relative to the input shaft 20 via a middle bearing 19 provided on the outer periphery of the eccentric portion 23 of the input shaft 20. As a result, when the input shaft 20 rotates, the sun gear 52 revolves while rotating around the inside of the ring gear 51 while the external teeth 55 mesh with the internal teeth 53 of the ring gear 51. Here, the middle bearing 19 is, for example, a ball bearing like the front bearing 16 and the rear bearing 17.

  The output shaft 60 is formed of a metal such as iron, for example. The output shaft 60 has a substantially cylindrical output cylinder portion 61 and a substantially disk-shaped disk portion 62. The output cylinder 61 is rotatably supported by the housing 10 via a metal bearing 18 provided inside the front housing 11. Here, the output cylinder portion 61 is provided so as to be coaxial with the large diameter portion 22 of the input shaft 20. The front bearing 16 is provided inside the output cylinder 61. Thus, the output cylinder 61 rotatably supports the other end 24 of the input shaft 20 via the metal bearing 18 and the front bearing 16.

The disk portion 62 is formed in a substantially disk shape so as to expand radially outward from an end of the output cylinder portion 61 on the sun gear 52 side in the space 5. The disk portion 62 has a hole 63 into which the protruding portion 54 of the sun gear 52 can enter. The hole 63 is formed so as to penetrate the disk 62 in the thickness direction. In the present embodiment, nine holes 63 are formed in the circumferential direction of the disk part 62 corresponding to the projecting parts 54 (see FIG. 3).
External teeth 64 are formed on the outer edge of the disk portion 62 over the entire range in the circumferential direction (see FIG. 3).

  With the above-described configuration, when the sun gear 52 revolves while rotating inside the ring gear 51, the inner wall of the hole 63 of the disk part 62 of the output shaft 60 is pushed in the circumferential direction of the disk part 62 by the outer wall of the protrusion 54. . Thereby, the rotation component of the sun gear 52 is transmitted to the output shaft 60. The rotation speed of the sun gear 52 is lower than the rotation speed of the input shaft 20. Therefore, the rotation output of the motor 3 is output from the output shaft 60 after being decelerated. Thus, the ring gear 51 and the sun gear 52 function as a “reducer”.

  The output gear 81 is made of, for example, a relatively high-strength magnetic material such as iron. The output gear 81 is formed in a plate shape. As shown in FIG. 3, the output gear 81 has an annular portion 801, a sector 802, and external teeth 85.

  The annular portion 801 is formed in an annular shape. The fan-shaped portion 802 is formed so as to fan out radially outward from the outer edge of the annular portion 801. In FIG. 3, the boundary between the annular portion 801 and the sector 802 is indicated by a two-dot chain line.

  The external teeth 85 are formed on a part of the outer edge of the sector 802 in the circumferential direction. The output gear 81 is provided between the middle housing 13 and the sensor housing 14 so that the external teeth 85 mesh with the external teeth 64 of the output shaft 60. Accordingly, when the motor 3 is driven to rotate and the output shaft 60 rotates, the output gear 81 rotates about the axis of the annular portion 801. That is, the output gear 81 rotates by the torque output from the motor 3. Here, the axis of the annular portion 801 is the rotation center C1 of the output gear 81.

  The output portion 86 is formed in a substantially cylindrical shape, for example, from a metal having a relatively high strength, such as iron. The output portion 86 is provided such that an outer wall at one end is fitted to an inner wall of the annular portion 801 of the output gear 81. The output unit 86 is provided so as not to rotate relative to the output gear 81 at the rotation center C1 of the output gear 81. That is, the output unit 86 is provided integrally with the output gear 81 such that the axis Ax2 coincides with the rotation center C1 of the output gear 81. Therefore, when the output gear 81 rotates, the output unit 86 rotates with the output gear 81 about the rotation center C1.

The output portion 86 is provided such that an end side opposite to the output gear 81 is located inside a cylindrical metal bearing 87 provided in the middle housing 13. Thus, the output portion 86 and the output gear 81 are rotatably supported by the middle housing 13 via the metal bearing 87.
A spline groove 861 as a connecting portion is formed on the inner wall of the output portion 86 at the end opposite to the output gear 81.

  As shown in FIG. 1, when one end of the manual shaft 101 of the shift-by-wire system 100 is fitted into the spline groove 861 of the output unit 86, the output unit 86 and the manual shaft 101 are spline-coupled. Thus, the output unit 86 outputs the torque of the motor 3 to the manual shaft 101 by transmitting the rotation of the input shaft 20 via the speed reducer 50 and the output gear 81.

  As shown in FIG. 2, the yoke 90 has a first yoke 91 and a second yoke 92. The first yoke 91 and the second yoke 92 are each formed in an arc shape by laminating arc-shaped thin plates made of a magnetic material such as iron. The first yoke 91 and the second yoke 92 are provided on the sensor housing 14 side with respect to the output gear 81. The first yoke 91 is provided along the outer edge of the sector 802 of the output gear 81 where the external teeth 85 are not formed. The second yoke 92 is provided on the rotation center C1 side of the output gear 81 with respect to the first yoke 91 and at a position away from the first yoke 91 by a predetermined distance.

  Here, the first yoke 91 and the second yoke 92 are respectively provided along an arc Arc1 centered on the rotation center C1 of the output gear 81. As a result, an arc-shaped gap S1 is formed between the first yoke 91 and the second yoke 92, which is an arc-shaped gap along the arc Arc1 centered on the rotation center C1.

  The magnet 93 as a first magnetic flux generation unit is provided so as to be sandwiched between one end of the first yoke 91 and one end of the second yoke 92. The magnet 93 is provided such that the S pole side is in contact with one end of the first yoke 91 and the N pole side is in contact with one end of the second yoke 92.

  The magnet 94 as a second magnetic flux generating unit is provided so as to be sandwiched between the other end of the first yoke 91 and the other end of the second yoke 92. The magnet 94 is provided such that the N pole contacts the other end of the first yoke 91 and the S pole contacts the other end of the second yoke 92.

  Thereby, the magnetic flux generated from the N poles of the magnets 93 and 94 flows through the first yoke 91 and the second yoke 92. Further, the magnetic flux flowing through the first yoke 91 and the second yoke 92 flies as a leakage magnetic flux through the arc-shaped gap S1 between the first yoke 91 and the second yoke 92. Further, the magnetic flux generated from the N poles of the magnets 93 and 94 also flows to the output gear 81 formed of a magnetic material.

  In the present embodiment, the first yoke 91, the second yoke 92, and the magnets 93 and 94 are covered by a molded portion 95 made of resin. That is, the first yoke 91, the second yoke 92, and the magnets 93 and 94 are molded with resin.

  The Hall IC 141 as a magnetic flux density detecting unit is insert-molded in a supporting unit 142 formed to protrude from the sensor housing 14 toward the output gear 81. That is, the Hall IC 141 is provided on the front housing 11 side. The support section 142 supports the Hall IC 141. As shown in FIGS. 1 and 2, the support portion 142 and the Hall IC 141 are provided so as to be located in the arc-shaped gap S1. That is, the Hall IC 141 is provided in the sensor housing 14 so as to be relatively movable with respect to the yoke 90 in the arc-shaped gap S1.

  The Hall IC 141 has a Hall element and a signal conversion circuit like the Hall IC 75. The Hall element outputs a signal corresponding to the density of the leakage magnetic flux flying in the arc-shaped gap S1. That is, the Hall element outputs a signal corresponding to the density of the magnetic flux passing therethrough.

  The output gear 81 and the output portion 86 are rotatable within the range of the length of the external teeth 85 in the circumferential direction. That is, the rotatable range of the output gear 81 and the output portion 86 corresponds to the range of the circumferential length of the external teeth 85. Here, the Hall IC 141 and the support portion 142 can move relative to the yoke 90 from near the end of the arc-shaped gap S1 on the magnet 93 side to near the end of the arc 94 on the magnet 94 side.

  The Hall IC 141 outputs a signal corresponding to the rotational position of the yoke 90 to the ECU 2. The ECU 2 can detect the rotational positions of the output gear 81 and the output unit 86 based on a signal from the Hall IC 141. Thus, the ECU 2 can detect the rotational position of the manual shaft 101 and the shift range of the automatic transmission 108.

As shown in FIG. 2, the first hole 811 is formed between the rotation center C1 and the yoke 90 so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The first hole 811 is formed in a circular shape. Here, the first hole 811 is formed such that the center is located on a first virtual straight line L1 connecting the rotation center C1 and the center of the yoke 90. Note that the first hole 811 is formed along the outer edge of the annular portion 801.
In the present embodiment, the first virtual straight line L1 passes through the center of the arc-shaped gap S1.

  The first hole 812 is formed between the rotation center C1 and the yoke 90 so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The first hole 812 is formed in a circular shape, like the first hole 811. Here, the first hole portion 812 is formed such that the center is located on a second virtual straight line L21 connecting the rotation center C1 and one end of the yoke 90, that is, the vicinity of the magnet 93. Note that the first hole 812 is formed along the outer edge of the annular portion 801.

The first hole 813 is formed between the rotation center C1 and the yoke 90 so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The first hole 813 is formed in a circular shape like the first hole 812. Here, the first hole 813 is formed such that the center is located on the second virtual straight line L22 connecting the rotation center C1 and the other end of the yoke 90, that is, the vicinity of the magnet 94. The first hole 813 is formed along the outer edge of the annular portion 801.
In the present embodiment, the first holes 811, 812, 813 are formed at equal intervals in the circumferential direction of the output gear 81.

  The second hole 821 is formed at a position corresponding to the arc-shaped gap S1 so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The second hole 821 is formed in a circular shape. The second hole 821 is formed on the magnet 94 side with respect to the first virtual straight line L1.

  The second hole 822 is formed at a position corresponding to the arc-shaped gap S1 so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The second hole 822 is formed in a circular shape, like the second hole 821. The second hole 822 is formed at an intermediate position between the first virtual straight line L1 and the second virtual straight line L21.

The second hole 823 is formed at a position corresponding to the arc-shaped gap S1 so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The second hole 823 is formed in a circular shape like the second hole 822. The second hole 823 is formed near the second virtual straight line L22.
The output gear 81 is formed with holes 831, 832, 841 in addition to the first holes 811, 812, 813 and the second holes 821, 822, 823.

  The holes 831, 832, 841 are formed so as to penetrate the sector 802 of the output gear 81 in the thickness direction. The holes 831 and 832 are formed in a circular shape like the first hole 811. The holes 831 and 832 are formed between the annular portion 801 and the external teeth 85. The hole 841 is formed in a circular shape, like the second hole 821. The hole 841 is formed near the magnet 93 between the annular portion 801 and the external teeth 85.

  FIG. 3 shows the magnetic flux generated from the N poles of the magnets 93 and 94 and flowing through the yoke 90 and the output gear 81, and the leakage magnetic flux flying through the arc-shaped gap S1. Here, the direction of the arrow indicating the magnetic flux corresponds to the direction of the magnetic flux, and the length of the line of the arrow corresponds to the height of the magnetic flux density.

  As shown in FIG. 3, the density of the leakage magnetic flux flying in the arc-shaped gap S1 is higher at a position closer to the magnet 93 or the magnet 94, and lower at a position closer to the first imaginary straight line L1. Further, the direction of the leakage magnetic flux flying in the arc-shaped gap S1 is reversed between the magnet 93 side and the magnet 94 side with respect to the first virtual straight line L1. Therefore, at the position corresponding to the first virtual straight line L1 in the arc-shaped gap S1, the magnetic flux density becomes zero. Further, since the first holes 811, 812, and 813 are formed in the output gear 81, the path of the magnetic flux flowing through the output gear 81 is narrowed.

As described above, (1) the rotary actuator 1 of the present embodiment includes the housing 10, the motor 3, the output gear 81, the output unit 86, the yoke 90, the magnet 93, the magnet 94, the Hall IC 141, and the first hole 811. , 812, 813.
The motor 3 is provided in the housing 10.
The output gear 81 is formed of a magnetic material, and rotates by a torque output from the motor 3.
The output unit 86 is provided integrally with the output gear 81 so that the axis Ax2 coincides with the rotation center C1 of the output gear 81, and rotates together with the output gear 81.

The yoke 90 is provided on the output gear 81, and forms a first yoke 91 and an arc-shaped gap S <b> 1 along the arc Arc 1 centered on the rotation center C <b> 1 of the output gear 81 between the first yoke 91 and the first yoke 91. It has two yokes 92.
The magnet 93 is provided between one end of the first yoke 91 and one end of the second yoke 92.
The magnet 94 is provided between the other end of the first yoke 91 and the other end of the second yoke 92.
The Hall IC 141 is provided in the housing 10 so as to be relatively movable with respect to the yoke 90 in the arc-shaped gap S1, and outputs a signal corresponding to the density of the magnetic flux passing therethrough.
The first holes 811, 812, 813 are formed between the rotation center C1 of the output gear 81 and the yoke 90 so as to penetrate the output gear 81 in the thickness direction.

  In the present embodiment, the magnetic flux generated from the magnet 93 and the magnet 94 flows through the first yoke 91 and the second yoke 92, and becomes a leakage magnetic flux through the arc-shaped gap S1 between the first yoke 91 and the second yoke 92. jump. The Hall IC 141 outputs a signal corresponding to the density of the leakage magnetic flux flying in the arc-shaped gap S1. Thus, the relative position of the yoke 90 with respect to the Hall IC 141 can be detected, and the rotational position of the output unit 86 can be detected.

  The magnetic flux generated from the magnet 93 and the magnet 94 also flows through the output gear 81 formed of a magnetic material. In the present embodiment, first holes 811, 812, and 813 are formed between the rotation center C1 of the output gear 81 and the yoke 90, that is, at specific locations of the output gear 81. Therefore, the path of the magnetic flux flowing through the output gear 81 can be reduced. Thus, the magnetic flux flowing through the output gear 81 can be reduced. Therefore, the density of the leakage magnetic flux flying in the arc-shaped gap S1 can be increased. Therefore, the detection accuracy of the rotational position of the output unit 86 can be improved.

  By the way, when the yoke 90, the magnet 93, and the magnet 94 are provided on a rotating member separate from the output unit 86, for example, which is rotated by the rotation of the output unit 86, the play between the output unit 86 and the rotating member is caused by There is a possibility that the detection accuracy of the rotational position of the output unit 86 may be reduced. In this embodiment, a yoke 90, a magnet 93, and a magnet 94 are provided on an output gear 81 integrated with an output section 86 to which the torque of the rotary actuator 1 is output. Therefore, the rotational position of the output unit 86 can be detected with high accuracy.

  The output gear 81 provided with the yoke 90 is made of a relatively strong magnetic material. Therefore, the output gear 81 is suitable for being used in the middle of a power transmission path to the output unit 86 to which the torque of the rotary actuator 1 is output.

  (2) In the present embodiment, the first hole 811 is formed on the first virtual straight line L1 connecting the rotation center C1 and the center of the yoke 90. At the position corresponding to the first virtual straight line L1 in the arc-shaped gap S1, the magnetic flux density becomes zero. Therefore, the first hole 811 on the first imaginary straight line L1 can narrow the path of the magnetic flux flowing to the portion of the output gear 81 corresponding to the position where the magnetic flux density becomes zero in the arc-shaped gap S1. Thereby, the magnetic flux density near the position where the magnetic flux density becomes zero in the arc-shaped gap S1 can be increased. Therefore, if the first hole 811 is not formed in the output gear 81, the density of the leakage magnetic flux decreases near the position where the magnetic flux density becomes zero in the arc-shaped gap S1, but in the present embodiment, the arc-shaped gap S1 In this case, since the magnetic flux density near the position where the magnetic flux density becomes zero can be increased, the detection accuracy of the rotational position of the output unit 86 particularly at the center of the rotatable range of the output gear 81 and the output unit 86 can be increased. Therefore, the detection accuracy of the rotational position of the output unit 86 can be improved over the entire rotatable range of the output gear 81 and the output unit 86.

  (3) In the present embodiment, the first hole 812 is formed on the second virtual straight line L21 connecting the rotation center C1 and one end of the yoke 90. Further, the first hole 813 is formed on a second virtual straight line L22 connecting the rotation center C1 and the other end of the yoke 90. Therefore, in the arc-shaped gap S1, the magnetic flux density at the end on the magnet 93 side and the end on the magnet 94 side can be increased. Accordingly, the detection accuracy of the rotational position of the output unit 86 at both ends of the rotatable range of the output gear 81 and the output unit 86 can be particularly improved.

  (4) In the present embodiment, a plurality of first holes (811, 812, 813) are formed in the circumferential direction of the output gear 81. Therefore, the magnetic flux density in the length direction of the arc gap S1 can be uniformly increased. In the present embodiment, three first holes (811, 812, 813) are formed at equal intervals in the circumferential direction of the output gear 81.

  (5) The present embodiment further includes second holes 821, 822, 823 formed at positions corresponding to the arc-shaped gap S1 so as to penetrate the output gear 81 in the thickness direction. Therefore, it is possible to reduce the magnetic flux flowing in the portion of the output gear 81 corresponding to the arc-shaped gap S1. Thereby, the density of the leakage magnetic flux flying through the arc-shaped gap S1 can be further increased. Therefore, the detection accuracy of the rotational position of the output unit 86 can be further improved.

(6) The present embodiment relates to a rotary actuator 1 which is attached to a wall portion 130 as an attachment target and is capable of rotationally driving a manual shaft 101 of a shift range switching device 110 as a drive target. , A rear housing 12, a motor 3, a speed reducer 50, an output unit 86, and a Hall IC 141.
The space 5 is formed between the rear housing 12 and the front housing 11, and a surface opposite to the front housing 11 is provided to be able to face the wall 130.
The motor 3 is provided on the rear housing 12 side of the space 5.
The reduction gear 50 as a gear mechanism is provided on the front housing 11 side with respect to the motor 3 in the space 5 and can transmit the torque of the motor 3.
The output portion 86 is provided radially outside the motor 3, has a spline groove 861 on the wall portion 130 side that can be connected to the manual shaft 101 of the shift range switching device 110, and shifts the torque transmitted by the speed reducer 50. Output to the manual shaft 101 of the range switching device 110.
The Hall IC 141 is provided on the front housing 11 side so as to be rotatable relative to the output unit 86, and outputs a signal corresponding to the density of the magnetic flux passing therethrough.

In the present embodiment, the speed reducer 50 is provided on the front housing 11 side with respect to the motor 3. Therefore, the rear housing 12 provided on the opposite side of the motor 3 from the speed reducer 50 can have a flat shape. Thus, when the rotary actuator 1 is mounted on the wall 130, a dead space that can be formed between the rear housing 12 and the wall 130 can be reduced. Therefore, the mountability of the rotary actuator 1 can be improved.
In the present embodiment, the Hall IC 141 is provided on the front housing 11 side. That is, the Hall IC 141 can be provided on the side opposite to the motor 3 with respect to the speed reducer 50. Therefore, the distance between the Hall IC 141 and the motor 3 can be increased. Thereby, it is possible to suppress the leakage magnetic flux from the motor 3 from affecting the Hall IC 141. Therefore, the detection accuracy of the rotation position of the output unit 86 by the Hall IC 141 can be improved.
Further, in the present embodiment, since the Hall IC 141 is provided on the front housing 11 side, the dead space which can be formed between the rear housing 12 and the wall 130 is increased as compared with the case where the Hall IC 141 is provided on the rear housing 12 side. Can be further suppressed.

  Also, (7) the present embodiment includes an output gear 81 that is rotatably provided integrally with the output portion 86 on the opposite side of the rear housing 12 of the motor 3 and that rotates by the torque transmitted by the speed reducer 50. I have. The Hall IC 141 is provided on the opposite side of the output gear 81 from the motor 3. Therefore, the distance between the Hall IC 141 and the motor 3 can be increased, and the magnetic flux leakage from the motor 3 can be blocked by the output gear 81. Thereby, it is possible to further suppress the leakage magnetic flux from the motor 3 from affecting the Hall IC 141.

  (11) The shift-by-wire system 100 of the present embodiment includes the rotary actuator 1 and the shift range switching device 110 described above. The shift range switching device 110 is connected to the output unit 86 of the rotary actuator 1 and can switch the shift range of the automatic transmission 108 by the torque output from the output unit 86.

  In the rotary actuator 1 of the present embodiment, since the detection accuracy of the rotation position of the output unit 86 is high, the rotation position of the manual shaft 101 to which the output unit 86 is connected and the shift range of the automatic transmission 108 can be adjusted with high accuracy. Can be detected.

(2nd Embodiment)
FIGS. 4 and 5 show a rotary actuator according to a second embodiment of the present invention.
The second embodiment further includes a forced drive shaft 160.
The forcible drive shaft 160 is formed in a long shape by, for example, metal, and is provided on the axis (Ax2) of the output portion 86 on the opposite side to the spline groove 861. In the present embodiment, the forced drive shaft 160 is provided coaxially with the output unit 86.
When the torque is input, the forced drive shaft 160 can forcibly rotate the output unit 86. In the present embodiment, when the output unit 86 is forcibly driven to rotate by the forced drive shaft 160, the manual shaft 101 is disengaged from the projection 125 of the park pole 123 and the parking gear 126, that is, The stopper 107 rotates in a direction to move from the concave portion 151 (P range) to the concave portion 154 (D range).
For example, even if the rotary actuator 1 becomes inoperable when the shift range is the P range, the P range (locking of the drive wheels) can be released by manually rotating the forced drive shaft 160.

In this embodiment, the rotary actuator 1 is attached to the wall 130 so that the surface of the rear housing 12 opposite to the front housing 11 abuts against the wall 130 of the shift range switching device 110 (see FIG. 4).
As shown in FIG. 5, in the present embodiment, the yoke 90 is provided between the speed reducer 50 and the forced drive shaft 160.
In the present embodiment, the output gear 81 and the output section 86 are integrally formed by the same member. In the present embodiment, the first hole 811 and the second hole 821 shown in the first embodiment are not formed.
The configuration of the second embodiment is the same as that of the first embodiment except for the points described above. Therefore, in the second embodiment, the same effects as in the first embodiment can be obtained for the same configuration as in the first embodiment.

  As described above, (9) the present embodiment further includes the forced drive shaft 160. The forced drive shaft 160 is provided on the opposite side of the spline groove 861 on the axis of the output unit 86, and can forcibly rotate the output unit 86 when torque is input. Therefore, even when the rotary actuator 1 becomes inoperable when the shift range is in the P range, the P range (drive wheel lock) can be released by manually rotating the forced drive shaft 160.

  (10) The present embodiment includes the output gear 81 and the yoke 90. The Hall IC 141 is relatively movable with respect to the yoke 90 in an arc-shaped gap S1 formed between the first yoke 91 and the second yoke 92. The yoke 90 is provided between the speed reducer 50 and the forced drive shaft 160. As described above, in the present embodiment, by disposing the yoke 90 in the space between the speed reducer 50 and the forced drive shaft 160 formed by providing the forced drive shaft 160, the space is effectively used. be able to.

(Third embodiment)
FIG. 6 shows a rotary actuator according to a third embodiment of the present invention. The third embodiment differs from the second embodiment in the arrangement and the like of the Hall IC 141.
In the third embodiment, the yoke 90 and the forced drive shaft 160 shown in the second embodiment are not provided. The Hall IC 141 is provided on the axis (Ax2) of the output unit 86. More specifically, the Hall IC 141 is supported by a support 142 inside the sensor housing 14 provided on the axis (Ax2) of the output unit 86.
A magnet 143 is provided at an end of the output section 86 opposite to the spline groove 861. Therefore, the magnet 143 can rotate together with the output unit 86. The magnet 143 is provided so as to face the Hall IC 141 on the axis (Ax2) of the output unit 86.

The Hall IC 141 outputs a signal corresponding to the density of the magnetic flux generated by the magnet 143. Thereby, the relative rotation position of the magnet 143 with respect to the Hall IC 141 can be detected, and the rotation position of the output unit 86 can be detected.
Note that, also in the third embodiment, the Hall IC 141 is provided on the opposite side of the output gear 81 from the motor 3. Therefore, the distance between the Hall IC 141 and the motor 3 can be increased, and the magnetic flux leakage from the motor 3 can be blocked by the output gear 81. Further, in the third embodiment, since the Hall IC 141 is provided on the axis (Ax2) of the output unit 86, the distance between the Hall IC 141 and the motor 3 is larger than in the second embodiment.
The configuration of the third embodiment is the same as that of the second embodiment except for the points described above. Therefore, in the third embodiment, the same configuration as that of the second embodiment can provide the same effect as that of the second embodiment.

  As described above, (8) in the present embodiment, the Hall IC 141 is provided on the axis (Ax2) of the output unit 86. Therefore, the distance between the Hall IC 141 and the motor 3 can be increased, and the influence of the leakage magnetic flux from the motor 3 on the Hall IC 141 can be further suppressed. Further, since the yoke 90 can be omitted, the number of members can be reduced, the size can be reduced, and the magnetic circuit can be simplified. In the configuration in which the Hall IC 141 is disposed at a position away from the axis of the output unit 86 as in the second embodiment, when the output shaft 60 and the output gear 81 are inclined, the distance between the yoke 90 and the Hall IC 141 changes. , The detection accuracy of the Hall IC 141 may be reduced. On the other hand, in the present embodiment, since the Hall IC 141 is provided on the axis (Ax2) of the output unit 86, even if the output unit 86 is inclined, the distance between the magnet 143 and the Hall IC 141 changes little, and the Hall IC 141 changes. Can be prevented from lowering the detection accuracy.

(Other embodiments)
In the above-described embodiment, an example has been described in which three (811, 812, 813) first hole portions are formed at equal intervals in the circumferential direction of the output gear. On the other hand, in other embodiments of the present invention, the first holes may not be formed at equal intervals in the circumferential direction of the output gear. Further, one, two, or four or more first holes may be formed in the output gear. The first hole may not be formed such that the center is located on the first virtual straight line L1 or the second virtual straight lines L21 and L22.

Further, in another embodiment of the present invention, the first hole and the second hole are not limited to a circle, but may be formed in any shape such as an ellipse, a triangle, a rectangle, or a polygon.
In another embodiment of the present invention, the number of the second holes is not limited to three (821, 822, 823), but one, two, or four or more may be formed in the output gear. .
Further, in another embodiment of the present invention, the second hole may not be formed in the output gear.
In another embodiment of the present invention, at least one of the holes 831, 832, 841 may not be formed in the output gear 81.

  In the above-described embodiment, an example has been described in which the gear mechanism includes a speed reducer that reduces the rotation of the input shaft and transmits the rotation to the output shaft. On the other hand, in another embodiment of the present invention, instead of the speed reducer, a speed increaser that speeds up the rotation of the input shaft and transmits the rotation to the output shaft may be provided as a gear mechanism. Alternatively, a mechanism for transmitting the rotation of the input shaft to the output shaft at a constant speed may be provided instead of the speed reducer. Alternatively, the input shaft and the output shaft may be integrally connected or formed so as not to rotate relative to each other without providing a mechanism such as a speed reducer or a speed increaser. That is, the output shaft only needs to be able to output the torque of the rotary electric machine to the driven shaft by transmitting the rotation of the input shaft.

In the above-described embodiment, an example has been described in which the rotary actuator is attached to the housing of the shift range switching device. On the other hand, in another embodiment of the present invention, the rotary actuator may be attached to a portion other than the housing of the shift range switching device, an outer wall of the device, or the like.
In another embodiment of the present invention, the rotating electric machine is not limited to a three-phase brushless motor, but may be another type of motor.

Further, in another embodiment of the present invention, any number of concave portions of the detent plate may be formed. That is, the number of ranges of the automatic transmission to which the present invention can be applied is not limited to four.
The shift-by-wire system according to the present invention is an automatic transmission for a continuously variable transmission (CVT) or HV (hybrid vehicle) that switches between four positions “P”, “R”, “N”, and “D” as in the above-described embodiment. In addition to the transmission (A / T), it can also be used for range switching of an EV (electric vehicle) or HV parking mechanism that switches between two positions of “P” or “notP”.
Further, in another embodiment of the present invention, the rotary actuator may be a device other than a shift range switching device or a parking switching device of a shift-by-wire system of a vehicle, and may be a driving target or a mounting target.
As described above, the present invention is not limited to the above embodiment, and can be implemented in various forms without departing from the gist of the present invention.

Reference Signs List 1 rotary actuator (rotary driving device), 3 motor (rotary electric machine), 10 housing, 81 output gear, 86 output section, 90 yoke, 91 first yoke, 92 second yoke, 93 magnet (first magnetic flux generating section) , 94 magnet (second magnetic flux generating unit), 141 Hall IC (magnetic flux density detecting unit), 811, 812, 813 first hole, Ax2 axis, C1 rotation center, Arc1 arc, S1 arc-shaped gap, 130 wall (mounting) Target), 101 manual shaft (drive target), 110 shift range switching device (drive target), 11 front housing, 5 spaces, 12 rear housing, 50 reduction gear (gear mechanism), 861 spline groove (connection part)

Claims (13)

A housing (10);
A rotating electric machine (3) provided in the housing;
An output gear (81) formed of a magnetic material and rotated by torque output from the rotating electric machine;
An output section (86) provided integrally with the output gear so that a shaft (Ax2) coincides with the rotation center (C1) of the output gear, and rotating together with the output gear;
A second yoke provided on the output gear and having a first yoke (91) and an arc-shaped gap (S1) along an arc (Arc1) centered on the rotation center between the first yoke and the first yoke; A yoke (90) having (92);
A first magnetic flux generator (93) provided between one end of the first yoke and one end of the second yoke;
A second magnetic flux generator (94) provided between the other end of the first yoke and the other end of the second yoke;
A magnetic flux density detector (141) provided in the housing so as to be relatively movable with respect to the yoke in the arc-shaped gap, and outputting a signal corresponding to a density of a magnetic flux passing therethrough;
First holes (811, 812, 813) formed between the rotation center and the yoke so as to penetrate the output gear in the thickness direction;
A rotary drive device (1) comprising:   The rotation drive device according to claim 1, wherein the first hole is formed on a first virtual straight line (L1) connecting the rotation center and the center of the yoke.   The rotation drive device according to claim 1 or 2, wherein the first hole is formed on a second virtual straight line (L21, L22) connecting the rotation center and one end or the other end of the yoke.   The rotation drive device according to any one of claims 1 to 3, wherein a plurality of the first holes are formed in a circumferential direction of the output gear.   The rotation according to any one of claims 1 to 4, further comprising a second hole (821, 822, 823) formed at a position corresponding to the arc-shaped gap so as to penetrate the output gear in a thickness direction. Drive. A rotation drive device (1) attached to the attachment target (130) and capable of rotationally driving the drive target (101, 110),
A front housing (11),
A rear housing (12) that forms a space (5) between the front housing and the front housing, and a surface opposite to the front housing is provided so as to be able to face or abut the mounting object;
A rotating electric machine (3) provided on the rear housing side of the space;
A gear mechanism (50) provided on the front housing side with respect to the rotating electric machine in the space, and capable of transmitting torque of the rotating electric machine;
An output unit (861) provided on a radially outer side of the rotating electric machine and connectable to the driven object on the attachment target side, and configured to output torque transmitted by the gear mechanism to the driven object. 86),
A magnetic flux density detector (141) provided on the front housing side so as to be rotatable relative to the output unit and outputting a signal corresponding to the density of a magnetic flux passing therethrough;
An output gear (81) that is provided so as to be rotatable integrally with the output unit on the side opposite to the rear housing with respect to the rotating electric machine in the axial direction of the output unit, and that rotates by torque transmitted by the gear mechanism;
Equipped with a,
The magnetic flux density detecting unit, the rotary drive device that provided on the side opposite to the rotating electrical machine with respect to the output gear in the axial direction of the output section. A rotation drive device (1) attached to the attachment target (130) and capable of rotationally driving the drive target (101, 110),
A front housing (11),
A rear housing (12) that forms a space (5) between the front housing and the front housing, and a surface opposite to the front housing is provided so as to be able to face or abut the mounting object;
A rotating electric machine (3) provided on the rear housing side of the space;
A gear mechanism (50) provided on the front housing side with respect to the rotating electric machine in the space, and capable of transmitting torque of the rotating electric machine;
An output unit (861) provided on a radially outer side of the rotating electric machine and connectable to the driven object on the attachment target side, and configured to output torque transmitted by the gear mechanism to the driven object. 86),
A magnetic flux density detector (141) provided on the front housing side so as to be rotatable relative to the output unit and outputting a signal corresponding to the density of a magnetic flux passing therethrough;
Equipped with a,
The magnetic flux density detecting unit, the rotary drive device that provided on the axis of the output unit. A rotation drive device (1) attached to the attachment target (130) and capable of rotationally driving the drive target (101, 110),
A front housing (11),
A rear housing (12) that forms a space (5) between the front housing and the front housing, and a surface opposite to the front housing is provided so as to be able to face or abut the mounting object;
A rotating electric machine (3) provided on the rear housing side of the space;
A gear mechanism (50) provided on the front housing side with respect to the rotating electric machine in the space, and capable of transmitting torque of the rotating electric machine;
An output unit (861) provided on a radially outer side of the rotating electric machine and connectable to the driven object on the attachment target side, and configured to output torque transmitted by the gear mechanism to the driven object. 86),
A magnetic flux density detector (141) provided on the front housing side so as to be rotatable relative to the output unit and outputting a signal corresponding to the density of a magnetic flux passing therethrough;
A forced drive shaft (160) provided on the axis of the output unit on the opposite side to the connection unit and capable of forcibly driving the output unit to rotate when torque is input;
A rotary drive device comprising: The rotation drive device according to claim 6, wherein the magnetic flux density detection unit is provided on an axis of the output unit. 7. The forcible drive shaft according to claim 6, further comprising a forced drive shaft provided on an axis of the output unit on a side opposite to the connection unit, and capable of forcibly driving the output unit to rotate when torque is input. Rotary drive. An output gear (81) rotatably provided integrally with the output section on the opposite side of the rotary electric machine from the rear housing, and rotated by torque transmitted by the gear mechanism;
A first yoke (91) is provided in the output gear, and an arc-shaped gap (S1) is formed between the first yoke and an arc (Arc1) around the rotation center (C1) of the output gear. A yoke (90) having a second yoke (92).
The magnetic flux density detector is relatively movable with respect to the yoke in the arc-shaped gap,
The rotary drive device according to claim 8 , wherein the yoke is provided between the gear mechanism and the forced drive shaft. The rotation drive device according to any one of claims 6 to 11 , wherein the shaft of the connection portion is located radially outward with respect to the shaft of the rotary electric machine. A rotary drive device according to any one of claims 1 to 12 ,
A shift range switching device (110) connected to the output unit and capable of switching a shift range of the automatic transmission (108) by torque output from the output unit;
A shift-by-wire system (100) comprising:

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