JP6955195B2 - Electric actuator - Google Patents

Description

The present invention relates to an electric actuator including an electric motor which is a power source for automatically opening and closing a door provided in a vehicle.

Patent Document 1 describes an example of an electric actuator constituting an electric sliding door device of a vehicle. This electric actuator houses an electric motor that is a power source of the electric sliding door device, a deceleration mechanism that transmits the drive torque output from the electric motor to the output shaft of the electric actuator, and an electric motor and a deceleration mechanism. It has a housing that is

As such an electric actuator, a control board on which various electronic components necessary for driving the electric motor are mounted is also housed in the housing.

Japanese Unexamined Patent Publication No. 2016-10877

The speed reduction mechanism is composed of a plurality of transmission members such as gears and belts that are operated by driving an electric motor. Then, in the housing, foreign matter generated by wear or breakage of the transmission members engaged with each other may be scattered. When the transmission member is made of a conductive material such as metal, the conductive foreign matter is scattered in the housing. When the electric motor, the speed reduction mechanism, and the control board are arranged in one accommodation space in this way, it is necessary to take measures against the scattering of foreign substances in the accommodation space caused by the wear or breakage of the transmission member. be.

The electric actuator for solving the above problems includes an electric motor, a transmission mechanism connected to the rotation shaft of the electric motor, and an output shaft to which torque output from the electric motor is transmitted via the transmission mechanism. A control board on which a plurality of electronic components are mounted, and a housing in which the electric motor, the transmission mechanism, and the control board are housed, and the transmission mechanism is the rotation of the electric motor. An intermediate shaft extending along the extending direction of the shaft, a first transmission unit that transmits the rotation of the rotating shaft of the electric motor to the intermediate shaft, and a second transmitting portion that transmits the rotation of the intermediate shaft to the output shaft. The second transmission unit has a transmission unit, and the second transmission unit has a first gear that rotates integrally with the intermediate shaft and a second gear that rotates integrally with the output shaft, and engages with each other. The matching first gear and the second gear are each made of an insulating material, and the housing sandwiches the stator of the electric motor in the axial direction which is the extension direction of the rotating shaft of the electric motor. It has a bottom wall located on the opposite side of the control board, and a surrounding wall standing on the bottom wall and surrounding the stator from the outside in the radial direction centered on the rotation axis. The tip of the surrounding wall faces the control board.

Since the transmission mechanism and the control board are arranged in one accommodation space in the housing, when foreign matter is generated in the housing due to wear or breakage of the first gear and the second gear that are engaged with each other. , The foreign matter may scatter in the accommodation space and adhere to the control board. In this regard, according to the above configuration, since the first gear and the second gear are made of an insulating material, the foreign matter is also made of an insulating material. Therefore, even if the foreign matter adheres to the control board, the electronic components on the control board can be normally driven, so that the electric motor can be appropriately driven.

Some of the components that make up an electric motor are made of a conductive material. When these parts are worn or damaged, conductive foreign matter is generated in the housing. In this respect, in the above configuration, the parts constituting the electric motor are arranged in the space partitioned by the surrounding wall and the control board. Therefore, even if conductive foreign matter is generated due to wear or breakage of the parts constituting the electric motor, the conductive foreign matter may flow out from the space partitioned by the surrounding wall and the control board. It can be suppressed by the surrounding wall and the control board. Therefore, it is possible to prevent the conductive foreign matter from scattering in the housing.

In the electric actuator, one of the surrounding wall and the electric motor is provided with a positioning recess, and the other one of the surrounding wall and the electric motor has a circumference centered on the rotation axis. It is preferable that the positioning convex portion accommodated in the positioning concave portion is provided in a state where the movement in the direction is restricted.

According to the above configuration, the displacement of the electric motor in the circumferential direction can be suppressed by accommodating the positioning convex portion in the positioning concave portion.
In the electric actuator, the surrounding wall is provided with a plurality of protrusions for suppressing misalignment that project inward in the radial direction and are arranged along the circumferential direction about the rotation axis. It is preferable to have.

According to the above configuration, it is possible to suppress the displacement of the electric motor in the radial direction inside the surrounding wall by each of the convex portions for suppressing the displacement.
In the electric actuator, it is preferable that the tip of the surrounding wall is provided with a convex portion for assembly that projects toward the control board. Further, it is preferable that the inner surface of the assembly convex portion in the radial direction includes an inclined surface that inclines so as to approach the inside in the radial direction as the distance from the control substrate in the axial direction increases.

When assembling the electric actuator, the electric motor may be accommodated inside the surrounding wall by moving the electric motor in the axial direction from the tip side of the surrounding wall. In the above configuration, an assembling convex portion is provided at the tip of the surrounding wall, and an inclined surface is provided on the assembling convex portion. Therefore, the electric motor that moves in the axial direction can be guided inward in the radial direction by the inclined surface. Therefore, the ease of assembling the electric actuator can be improved.

In the electric actuator, of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface. In this case, the number of electronic components mounted on the first surface is preferably smaller than the number of electronic components mounted on the second surface.

According to the above configuration, the number of electronic components mounted on the first surface to which the foreign matter easily adheres is smaller than the number of electronic components mounted on the second surface to which the foreign matter does not easily adhere. Therefore, the event that the foreign matter adheres to the electronic component is unlikely to occur.

In the electric actuator, of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface. When the inner region of the first surface in the radial direction from the surrounding wall is the inner region, at least the inner region of the first surface is coated with an insulating film. It is preferable to have.

According to the above configuration, an insulating film is coated on the inner region of the first surface to which conductive foreign matter may adhere due to wear or breakage of parts constituting the electric motor. Therefore, even if the conductive foreign matter adheres to the inner region, the electric motor can be appropriately driven.

In the electric actuator, of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface. When the inner region of the first surface in the radial direction from the surrounding wall is the inner region and the outer region in the radial direction from the inner region is the outer region, the electronic component in the inner region is defined as the outer region. The mounting density of the electronic component is preferably lower than the mounting density of the electronic component in the outer region.

According to the above configuration, the mounting density of the electronic component in the inner region where the conductive foreign matter is likely to adhere is lower than the mounting density of the electronic component in the outer region where the conductive foreign matter is unlikely to adhere. Therefore, the phenomenon that the conductive foreign matter adheres to the electronic component is unlikely to occur.

In the electric actuator, of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface. When the inner region of the first surface in the radial direction from the surrounding wall is the inner region and the outer region in the radial direction from the inner region is the outer region, the outer region includes the outer region. It is preferable that an electronic component that is taller than the electronic component mounted in the inner region is mounted.

According to the above configuration, tall electronic components are mounted in a region that does not face the components of the electric motor. Therefore, the control board can be arranged near the component in the axial direction as compared with the case where the tall electronic component is mounted in the inner region which is the area facing the component of the electric motor. .. Therefore, the electric actuator can be miniaturized.

In the electric actuator, prior Symbol intermediate shaft is disposed between the rotary shaft and the output shaft, said control board, insertion portion into which the intermediate shaft is inserted that provided.

According to the above configuration, by providing the insertion portion in the control board, it is possible to avoid contact between the intermediate shaft and the control board. Therefore, the control board can be brought closer to the components of the electric motor in the axial direction. Therefore, it is possible to contribute to the miniaturization of the electric actuator.

According to the electric actuator, the electric motor can be appropriately driven even if a foreign substance adheres to the control board housed in the housing.

The schematic diagram which shows the outline of the electric sliding door device which comprises the electric actuator of embodiment. The side view which shows the electric actuator of the same embodiment. The end view which shows the electric actuator. The plan view which shows the electric motor and its peripheral structure in the electric actuator. The perspective view which shows the internal structure of the electric actuator. An enlarged perspective view of a part of the first housing. The schematic diagram which shows the state of assembling the stator of an electric motor to the 1st housing. The perspective view which shows the internal structure of the electric actuator. FIG. 5 is a cross-sectional view schematically showing a positional relationship between a housing wall, a stator, and a control board in the electric actuator. The plan view which shows typically the 2nd surface of the control board of the electric actuator. The plan view which shows typically the 1st surface of the control board. The schematic diagram of the first surface. FIG. 6 is a schematic view showing a part of a surrounding wall and a stator in an electric actuator of another embodiment.

Hereinafter, an embodiment of the electric actuator will be described with reference to FIGS. 1 to 12.
FIG. 1 shows an electric sliding door device 10 of a vehicle including the electric actuator 20 of the present embodiment. As shown in FIG. 1, the electric sliding door device 10 includes a sliding door 11 that closes a door opening formed on a side surface of a vehicle body, and a plurality of rails 12 provided on the vehicle body. .. The slide door 11 is attached to the vehicle body in a state where it can slide and move in the extending direction of each rail 12.

The electric actuator 20 is built in the sliding door 11. Further, in the slide door 11, a conversion mechanism 15 is provided which transmits the torque output from the electric actuator 20 to the slide door 11 and slides the slide door 11 to move. For example, the conversion mechanism 15 can be configured to include a rotating drum and a plurality of cables.

Next, the electric actuator 20 will be described.
As shown in FIGS. 2 and 3, the electric actuator 20 includes a housing 21 and an output shaft 60 connected to a conversion mechanism 15. The output shaft 60 is rotatably supported by the housing 21, and a part of the output shaft 60 projects outside the housing 21. Then, a portion of the output shaft 60 protruding outside the housing 21 is connected to the conversion mechanism 15. In the present embodiment, the extending direction of the output shaft 60 is referred to as the axial direction Z.

The housing 21 is formed by assembling a first housing 22 and a second housing 23 having a bottomed cylindrical shape to each other. Bearings 24A and 24B for supporting the output shaft 60 are provided on the bottom wall 221 of the first housing 22 and the bottom wall 231 of the second housing 23, respectively. Further, an insertion hole 25 through which the output shaft 60 is inserted is formed in the bottom wall 231 of the second housing 23.

The housing 21 houses an electric motor 30, which is a power source for the electric sliding door device 10, a reduction mechanism 40, which is an example of a transmission mechanism that is driven and connected to the electric motor 30, and a control board 70. .. The speed reduction mechanism 40 is configured to transmit the torque output from the electric motor 30 to the output shaft 60. Various electronic components for controlling the drive of the electric motor 30 are mounted on the control board 70.

As shown in FIGS. 3 and 4, the electric motor 30 is a brushless motor. Such an electric motor 30 includes a rotating shaft 31 extending in the axial direction Z, a rotor 32 rotating integrally with the rotating shaft 31, and an annular shape located outside the rotor 32 in the radial direction centered on the rotating shaft 31. It has a stator 33 and a stator 33. The rotating shaft 31 is rotatably supported by the bottom wall 221 of the first housing 22 via the bearing 34A, and is rotatably supported by the bottom wall 231 of the second housing 23 via the bearing 34B. It is supported by. Further, on the outer peripheral side of the stator 33, a plurality of stator-side convex portions 331 projecting outward in the radial direction about the rotation shaft 31 are provided. Each of these stator-side convex portions 331 is arranged along the circumferential direction centered on the rotation shaft 31.

The control board 70 is arranged on the bottom wall 231 side of the second housing 23 with respect to the stator 33 in the axial direction Z.
The speed reduction mechanism 40 is intermediate between the intermediate shaft 41 arranged between the electric motor 30 and the output shaft 60 and the first transmission unit 44 that transmits the rotation of the rotation shaft 31 of the electric motor 30 to the intermediate shaft 41. It has a second transmission unit 46 that transmits the rotation of the shaft 41 to the output shaft 60. The intermediate shaft 41 extends in the axial direction Z. The intermediate shaft 41 is rotatably supported by the bottom wall 221 of the first housing 22 via the bearing 42A, and is rotatably supported by the bottom wall 231 of the second housing 23 via the bearing 42B. It is supported in a good condition.

The first transmission unit 44 is arranged on the opposite side of the control board 70 sandwiching the stator 33 in the axial direction Z, that is, on the bottom wall 221 side of the first housing 22 with respect to the stator 33 in the axial direction Z. As shown in FIG. 5, the first transmission unit 44 includes a first pulley 441 that rotates integrally with the rotating shaft 31, a second pulley 442 that rotates integrally with the intermediate shaft 41, a first pulley 441, and a first pulley 441. It has an endless belt 443 that is hung on the pulley 442 of 2. Then, when the rotating shaft 31 rotates, the belt 443 moves by rotating the first pulley 441, and the intermediate shaft 41 rotates together with the second pulley 442. That is, in the present embodiment, the first pulley 441, the second pulley 442, and the belt 443 are engaged with each other and function as an example of a "transmission member" that operates by driving the electric motor 30.

The bottom wall 221 of the first housing 22 is provided with an auxiliary mechanism 50 for pressing the belt 443 toward the first pulley 441. The auxiliary mechanism 50 has a pair of rotating bodies 51.

As shown in FIGS. 3 and 5, the second transmission unit 46 has a first gear 461 that rotates integrally with the intermediate shaft 41 and a second gear 462 that rotates integrally with the output shaft 60. .. The first gear 461 is arranged on the bottom wall 231 side of the second housing 23 with respect to the second pulley 442 in the axial direction Z. The diameter of the first gear 461 is smaller than the diameter of the second pulley 442. The first gear 461 and the second gear 462 are engaged with each other. Therefore, when the intermediate shaft 41 rotates, the first gear 461 and the second gear 462 rotate, respectively, so that the output shaft 60 rotates. That is, the first gear 461 and the second gear 462 are engaged with each other and function as an example of a "transmission member" that operates by driving the electric motor 30.

In the present embodiment, the first and second pulleys 441 and 442, the belt 443, and the first and second gears 461 and 462 are each made of an insulating material. For example, the first and second pulleys 441 and 442 and the first and second gears 461 and 462 are made of synthetic resin, respectively. Further, for example, the belt 443 is made of a fiber-containing rubber having a glass core wire.

As shown in FIGS. 3 to 5, the electric motor 30 is attached to the bottom wall of the housing 21 located on the opposite side of the control board 70 sandwiching the stator 33 in the axial direction Z, that is, the bottom wall 221 of the first housing 22. A surrounding wall 26 that surrounds the stator 33 from the outside is erected in the radial direction centered on the rotating shaft 31 of the above. The surrounding wall 26 has an arc shape, and the inner diameter of the surrounding wall 26 is slightly larger than the outer diameter of the stator 33.

As shown in FIGS. 4 to 6, a plurality of positioning grooves 27 functioning as positioning recesses are provided on the inner peripheral surface side of the surrounding wall 26. Each of these positioning grooves 27 is arranged along the circumferential direction centered on the rotation shaft 31. Further, each positioning groove 27 extends in the axial direction Z, respectively. Then, in each positioning groove 27, the stator-side convex portion 331 of the stator 33 is housed in a state where the movement in the circumferential direction is restricted. That is, in the present embodiment, the stator-side convex portion 331 functions as a "positioning convex portion".

Further, on the inner peripheral surface side of the surrounding wall 26, a plurality of first wall-side convex portions 28 protruding inward in the radial direction centered on the rotation shaft 31 are provided. Each of the first wall-side convex portions 28 is arranged along the circumferential direction centered on the rotation axis 31. Further, each of the first wall-side convex portions 28 extends in the axial direction Z. Then, the tip surface 281 of each of the first wall-side convex portions 28 is in surface contact with the stator 33 of the electric motor 30. As a result, the displacement of the electric motor 30 in the radial direction centered on the rotating shaft 31 is regulated. Therefore, in the present embodiment, the first wall-side convex portion 28 functions as an example of the “positional deviation suppressing convex portion”.

Further, as shown in FIGS. 5 and 6, at the tip of the surrounding wall 26 (that is, the end on the side facing the control board 70), a plurality of second walls projecting toward the control board 70 in the axial direction Z. A side convex portion 29 is provided. The number of the second wall-side convex portions 29 is the same as the number of the first wall-side convex portions 28, and each of the second wall-side convex portions 29 is along the circumferential direction centered on the rotation axis 31. Each is arranged. Specifically, each of the second wall-side convex portions 29 is arranged at the same circumferential position as the corresponding first wall-side convex portion 28. That is, each of the second wall-side convex portions 29 is connected to the corresponding first wall-side convex portion 28, respectively. The inner surface of each of the second wall-side convex portions 29 has an inclined surface 291 that inclines so as to approach the inner side in the radial direction as the distance from the control substrate 70 increases in the axial direction Z.

Here, with reference to FIG. 7, a procedure for assembling the stator 33 of the electric motor 30 to the first housing 22 when assembling the electric actuator 20 will be described.
As shown in FIG. 7, when the stator 33 is assembled to the first housing 22, the stator 33 is moved so as to approach the bottom wall 221 in the axial direction Z with respect to the first housing 22. At this time, if the center of the stator 33 is deviated from the center of the rotating shaft 31, the stator 33 comes into contact with the inclined surface 291 of the second wall-side convex portion 29 as shown by the alternate long and short dash line in FIG. When the stator 33 is pushed toward the bottom wall 221 in this state, it is guided by the inclined surface 291 so that the center of the stator 33 approaches the center of the rotation shaft 31 as shown by an arrow in FIG. It moves toward the bottom wall 221 while being displaced. As a result, the stator 33 is coaxially arranged with the rotating shaft 31 and the rotor 32 inside the surrounding wall 26. Therefore, in the present embodiment, the second wall-side convex portion 29 having the inclined surface 291 functions as an example of the “convex portion for assembly”.

Next, the control board 70 will be described.
As shown in FIGS. 8 and 9, the control board 70 is arranged so as to cover the electric motor 30 from the bottom wall 231 side of the second housing 23 in the axial direction Z. The control board 70 is attached to the first housing 22.

The tip of the surrounding wall 26 faces the control board 70. Therefore, in the housing 21, the surrounding wall 26 and the control board 70 partition the accommodation space 21A for accommodating the components of the electric motor 30 (that is, the rotor 32 and the stator 33).

Further, the control board 70 is provided with an insertion hole 71 through which the rotating shaft 31 is inserted, and an insertion notch 72 which is an example of the insertion portion through which the intermediate shaft 41 is inserted.
In the present embodiment, of the two surfaces of the control board 70, the surface facing the stator 33 is referred to as the first surface 73, and the surface opposite to the first surface 73, that is, the second housing 23. The surface facing the bottom wall 231 is referred to as a second surface 74.

FIG. 10 schematically illustrates a mounting mode of the electronic component 81 on the second surface 74. As shown in FIG. 10, a plurality of types of chip-shaped electronic components 81 are mounted on the second surface 74 in a relatively dense manner. Examples of the electronic component 81 mounted on the second surface 74 include an electronic control unit that controls the electric motor 30.

FIG. 11 schematically shows a mounting mode of the electronic components 82 and 83 on the first surface 73. The number of electronic components 82, 83 mounted on the first surface 73 is smaller than the number of electronic components 81 mounted on the second surface 74.

Further, as shown in FIGS. 9 and 11, the first surface 73 can be divided into a plurality of regions. Specifically, the first surface 73 is an inner region 73A which is a region inside the surrounding wall 26 in the radial direction about the rotation axis 31, and a region outside the inner region 73A in the radial direction. It can be divided into an outer region 73B. As shown in FIGS. 11 and 12, the mounting density of the electronic component 82 in the inner region 73A is lower than the mounting density of the electronic component 83 in the outer region 73B. Further, the distance between adjacent lines in the circuit pattern formed in the inner region 73A is formed in the distance between the adjacent lines in the circuit pattern formed in the outer region 73B and on the second surface 74. It is wider than both of the intervals between adjacent lines in the circuit pattern.

Examples of the electronic component 82 mounted on the inner region 73A include a chip-shaped electronic component (for example, a Hall IC) for detecting the rotation angle of the electric motor 30. Further, in the outer region 73B that does not face the component of the electric motor 30, a connector that is taller than the electronic component 82 mounted on the inner region 73A and the electronic component 81 mounted on the second surface 74. Electronic components 83 such as are mounted.

As shown in FIG. 12, the first surface 73 is coated with an insulating film 75. In FIG. 12, the region coated with the insulating film 75 is represented by a chain double-dashed line. As is clear from FIG. 12, at least the inner region 73A of the first surface 73 is coated with the insulating film 75. Examples of such an insulating film 75 include those containing a polyolefin resin as a component.

Next, the operation and effect of the electric actuator 20 of the present embodiment will be described.
(1) Each transmission member (that is, each pulley 441, 442, belt 443, and each gear 461, 462) constituting the speed reduction mechanism 40 operates by driving the electric motor 30 in a state of being engaged with each other. .. Then, foreign matter may be generated in the housing 21 due to wear or breakage of the transmission members engaged with each other, and the foreign matter may be scattered in the housing 21 and adhere to the control board 70. In this embodiment, the pulleys 441 and 442, the belt 443, and the gears 461 and 462 are each made of an insulating material. Therefore, the foreign matter generated by the wear or breakage of the pulleys 441, 442, the belt 443, and the gears 461, 462 is also made of the insulating material. Even if such an insulating foreign substance adheres to the electronic components 81 to 83 and the circuit pattern on the control board 70, the electronic components 81 to 83 can be appropriately driven. Therefore, in the electric actuator 20 in which the electric motor 30, the reduction mechanism 40, and the control board 70 are arranged in one accommodation space, foreign matter generated by wear or breakage of the pulleys 441, 442, the belt 443, and the gears 461, 462. Can properly drive the electric motor 30 even if it adheres to the control board 70.

(2) At least a part of the components of the electric motor 30 are made of a conductive material such as metal. Foreign matter due to wear or breakage may also be generated from parts made of such conductive materials. In this respect, in the present embodiment, the components of the electric motor 30 are arranged in the accommodation space 21A partitioned by the surrounding wall 26 and the control board 70. Therefore, even if conductive foreign matter is generated from the components of the electric motor 30 due to wear or breakage, the conductive foreign matter is discharged from the inside of the accommodation space 21A partitioned by the surrounding wall 26 and the control board 70 to the outside. The outflow can be suppressed by the surrounding wall 26 and the control board 70. That is, it is possible to prevent conductive foreign matter from adhering to the second surface 74 of the control board 70 and the outer region 73B of the first surface 73.

(3) In the control board 70, electronic components 81 to 83 are mounted on both the first surface 73 and the second surface 74, respectively. However, the number of electronic components 82 and 83 mounted on the first surface 73 to which the foreign matter easily adheres is larger than the number of electronic components 81 mounted on the second surface 74 to which the foreign matter does not easily adhere. few. Therefore, the event that the foreign matter adheres to the electronic component is unlikely to occur.

(4) Further, on the first surface 73, the mounting density of the electronic component 82 in the inner region 73A facing the component of the electric motor 30 is the outer region 73B not facing the component of the electric motor 30. It is lower than the mounting density of the electronic component 83 in. Therefore, the phenomenon that the conductive foreign matter adheres to the electronic component is unlikely to occur.

(5) Further, in the present embodiment, the inner region 73A of the first surface 73 to which the foreign matter is most likely to adhere is coated with an insulating film 75. Therefore, even if the foreign matter adheres to the electronic component 82 mounted on the inner region 73A, the electronic component 82 can be appropriately driven.

(6) In the present embodiment, a tall electronic component 83 such as a connector is mounted on the first surface 73. Further, the tall electronic component 83 is mounted on the outer region 73B of the first surface 73 that does not face the component component of the electric motor 30. Further, a relatively wide space is interposed between the outer region 73B and the bottom wall 221 of the first housing 22, and a tall electronic component 83 can be arranged in the space. Therefore, the gap between the bottom wall 231 of the second housing 23 and the control board 70 can be narrowed as compared with the case where such a tall electronic component 83 is mounted on the second surface 74. Further, as compared with the case where such a tall electronic component 83 is mounted on the inner region 73A of the first surface 73, the control board 70 can be brought closer to the component component of the electric motor 30. Therefore, the size of the electric actuator 20 in the axial direction Z can be reduced.

(7) Further, the control board 70 is provided with an insertion cutout portion 72, and the intermediate shaft 41 is inserted through the insertion cutout portion 72. By providing the control board 70 with a portion through which the intermediate shaft 41 is inserted in this way, the control board 70 can be arranged closer to the stator 33 side of the electric motor 30. This can further contribute to the miniaturization of the electric actuator 20.

(8) In the present embodiment, the surrounding wall 26 is provided with a positioning groove 27, and the stator 33 is provided with a stator-side convex portion 331 housed in the positioning groove 27. As a result, when the stator 33 is housed inside the surrounding wall 26, the position of the stator 33 in the circumferential direction can be easily aligned. Further, in a state where the stator 33 is arranged inside the surrounding wall 26, the side wall of the positioning groove 27 restricts the movement of the stator 33 in the circumferential direction. As a result, the displacement of the stator 33 in the circumferential direction can be suppressed. Therefore, it is possible to suppress a decrease in the detection accuracy of the rotation angle of the electric motor 30 using the signal output from the Hall IC mounted on the control board 70.

(9) Further, the surrounding wall 26 is provided with a plurality of first wall-side convex portions 28, and is provided on the tip surface 281 of each first wall-side convex portion 28 arranged along the circumferential direction. On the other hand, the stator 33 is in surface contact. As a result, the displacement of the stator 33 in the radial direction can be suppressed.

(10) Further, the surrounding wall 26 is provided with a second wall-side convex portion 29, and the second wall-side convex portion 29 is formed with an inclined surface 291. As a result, when the stator 33 is assembled to the first housing 22, the stator 33 that moves in the axial direction Z can be guided inward in the radial direction by the inclined surface 291. Therefore, the ease of assembling the stator 33 to the first housing 22 can be improved.

(11) In the present embodiment, the second wall-side convex portion 29 is arranged at the same circumferential direction as the first wall-side convex portion 28, and the second wall-side convex portion 29 is the first. It is connected to the wall-side convex portion 28. Therefore, the diameter of the second wall-side convex portion 29 at the base end portion is compared with the case where the second wall-side convex portion 29 is arranged at a position different from that of the first wall-side convex portion 28 in the circumferential direction. The directional dimension can be increased. Therefore, the rigidity of the second wall-side convex portion 29 can be increased. Therefore, when the stator 33 is arranged inside the surrounding wall 26, it is possible to prevent the second wall-side convex portion 29 from being damaged when the stator 33 comes into contact with the second wall-side convex portion 29.

The above embodiment may be changed to another embodiment as described below.
-The shape of the insertion portion formed on the control board 70 may be changed as appropriate. For example, when the control board 70 employs a board having a portion overlapping with the second gear 462 in the axial direction Z, the insertion portion may be a hole through which the intermediate shaft 41 can be inserted.

-A relatively tall electronic component such as a connector may be mounted on the second surface 74 of the control board 70.
On the first surface 73, the mounting density of the electronic component 83 in the outer region 73B may be as low as the mounting density of the electronic component 82 in the inner region 73A. In this case, the number of electronic components 81 mounted on the second surface 74 is larger than that in the case described in the above embodiment.

The number of electronic components 82 and 83 mounted on the first surface 73 may be about the same as the number of electronic components 81 mounted on the second surface 74.
If foreign matter adheres to the inner region 73A of the first surface 73 does not interfere with the normal driving of the electric motor 30, the first surface 73 should not be coated with the insulating film 75. May be good.

-If the surrounding wall 26 is provided with the first wall-side convex portion 28, the tip surface 281 of the first wall-side convex portion 28 does not necessarily have to come into contact with the stator 33. By providing the first wall-side convex portion 28 on the surrounding wall 26 in this way, it is possible to suppress the displacement of the stator 33 inside the surrounding wall 26.

-If the displacement amount of the stator 33 inside the surrounding wall 26 can be suppressed within an allowable range, it is not necessary to provide the first wall-side convex portion 28 on the surrounding wall 26. For example, by providing a convex portion for suppressing displacement that protrudes outward in the radial direction on the outer peripheral side of the stator 33 and bringing the tip of the convex portion for displacement positioning into contact with the inner peripheral surface of the surrounding wall 26, the surrounding wall 26 It is also possible to regulate the displacement of the stator 33 on the inside.

In the above embodiment, the second wall-side convex portion 29 is arranged at the same circumferential position as the first wall-side convex portion 28, but the circumferential position of the second wall-side convex portion 29 is set. , The position in the circumferential direction of the first wall-side convex portion 28 may be different. In this case, the number of the second wall-side convex portions 29 does not have to be the same as the number of the first wall-side convex portions 28.

-It is not necessary to provide the second wall-side convex portion 29 on the surrounding wall 26.
As shown in FIG. 13, a positioning recess 332 is provided on the outer peripheral side of the stator 33, and a positioning convex portion 127 projecting radially inward is provided on the inner peripheral side of the surrounding wall 26, and the positioning convex portion 127 is provided. It may be accommodated in the positioning recess 332. Even in this case, the displacement of the stator 33 in the circumferential direction can be suppressed as in the above embodiment.

If the displacement of the stator 33 in the circumferential direction can be suppressed within an allowable range, the positioning concave portion and the positioning convex portion may not be provided on the surrounding wall 26 and the stator 33.
As the transmission mechanism, if the torque output from the electric motor 30 can be transmitted to the output shaft 60, a mechanism having a configuration different from that of the speed reduction mechanism 40 described in the above embodiment may be adopted.

-As the electric motor, a motor other than the brushless motor may be adopted as long as it can be used as a power source for automatically opening and closing the door and can be accommodated in the housing 21.

-The electric actuator may be applied to an actuator for opening and closing a door other than the sliding door. For example, examples of doors other than sliding doors include back doors and luggage doors provided at the rear of the vehicle.

20 ... Electric actuator, 21 ... Housing, 22 ... First housing, 23 ... Second housing, 231 ... Bottom wall, 26 ... Surrounding wall, 27 ... Positioning groove, which is an example of a positioning recess, 127 ... For positioning Convex portion, 28 ... First wall-side convex portion which is an example of a convex portion for suppressing misalignment, 29 ... Second wall-side convex portion which is an example of an assembly convex portion, 291 ... Inclined surface, 30 ... Electric motor , 31 ... rotating shaft, 33 ... stator, 331 ... stator side convex portion which is an example of positioning convex portion, 332 ... positioning concave portion, 40 ... deceleration mechanism which is an example of transmission mechanism, 41 ... intermediate shaft, 44 ... 1 transmission unit, 441 ... 1st pulley which is an example of a transmission member, 442 ... a second pulley which is an example of a transmission member, 443 ... a belt which is an example of a transmission member, 46 ... a second transmission unit, 461 ... a first gear which is an example of a transmission member, 462 ... a second gear which is an example of a transmission member, 60 ... an output shaft, 70 ... a control board, 72 ... an insertion notch part which is an example of an insertion part, 73 ... First surface, 73A ... inner region, 73B ... outer region, 74 ... second surface, 75 ... insulating film, 81-83 ... electronic components.

Claims (9)

With an electric motor
A transmission mechanism connected to the rotating shaft of the electric motor and
An output shaft to which torque output from the electric motor is transmitted via the transmission mechanism, and
A control board on which multiple electronic components are mounted and
The electric motor, the transmission mechanism, and the housing in which the control board is housed are provided.
The transmission mechanism includes an intermediate shaft extending along an extension direction of the rotary shaft of the electric motor, a first transmission unit that transmits the rotation of the rotary shaft of the electric motor to the intermediate shaft, and the intermediate shaft. It has a second transmission unit that transmits rotation to the output shaft, and has.
The second transmission unit has a first gear that rotates integrally with the intermediate shaft and a second gear that rotates integrally with the output shaft.
The first gear and the second gear that engage with each other are each made of an insulating material .
The housing is
A bottom wall located on the opposite side of the control board sandwiching the stator of the electric motor in the axial direction which is the extension direction of the rotation shaft of the electric motor.
It is erected on the bottom wall and has a surrounding wall that surrounds the stator from the outside in the radial direction about the rotation axis.
An electric actuator in which the tip of the surrounding wall faces the control board. A positioning recess is provided on either one of the surrounding wall and the electric motor, and movement in the circumferential direction about the rotation axis is provided on either one of the surrounding wall and the electric motor. electric actuator according to claim 1, positioning protrusion in a restricted state is accommodated in the positioning within the recess. Wherein the surrounding wall protrudes inwardly in the radial direction, and the rotary shaft according to claim 1 or more position fixing protrusions which are arranged along a circumferential direction centered are provided The electric actuator according to claim 2. At the tip of the surrounding wall, a convex portion for assembly is provided so as to project toward the control board side.
An inside surface in the radial direction of the assembly protrusion is any one of claims 1 to 3 which includes an inclined surface inclined with increasing distance from the control board in the axial direction so as to approach inward in the radial direction The electric actuator according to one item. When the surface of both sides of the control board that faces the stator of the electric motor is the first surface and the surface that is located on the opposite side of the first surface is the second surface.
The electric motor according to any one of claims 1 to 4 , wherein the number of electronic components mounted on the first surface is smaller than the number of electronic components mounted on the second surface. Actuator. Of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface.
When the inner region of the first surface in the radial direction from the surrounding wall is defined as the inner region,
Wherein among the first surface, at least in the inner region, the electric actuator according to any one of claims 1 to 4, an insulating film is coated. Of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface.
When the inner region of the first surface in the radial direction from the surrounding wall is the inner region and the outer region in the radial direction from the inner region is the outer region.
The mounting density of electronic components in the inner region, the electric actuator according to any one of the electronic lower claim than the packing density of the component 1 to claim 4 in the outer region. Of both sides of the control board, the surface of the electric motor facing the stator is designated as the first surface, and the surface located on the opposite side of the first surface is designated as the second surface.
When the inner region of the first surface in the radial direction from the surrounding wall is the inner region and the outer region in the radial direction from the inner region is the outer region.
Wherein the outer region, the electric actuator according to any one of the preceding claims, tall electronic components than electronic components mounted on the inner region are mounted one to Claim 4. Before Symbol intermediate shaft is disposed between the rotary shaft and the output shaft,
The electric actuator according to any one of claims 1 to 8 , wherein the control board is provided with an insertion portion through which the intermediate shaft is inserted.

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