JP2016109295A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an actuator which inhibits a physical constitution from enlarging.SOLUTION: An actuator 10 includes: a motor 12 having a rotary shaft 14; an output shaft 16 coaxially arranged with the rotary shaft 14; a rotary shaft side gear 38 which is provided so as to rotate integrally with the rotary shaft 14; and an output shaft side gear 40 which is provided so as to rotate integrally with the output shaft 16. The actuator 10 includes an intermediate gear structure 46 having a first intermediate gear 42, which is provided between the rotary shaft side gear 38 and the output shaft side gear 40 and engages with the rotary shaft side gear 38, and a second intermediate gear 44 which is provided so as to rotate integrally with the first intermediate gear 42 and engages with the output shaft side gear 40. A first intermediate gear 42 side end part in the intermediate gear structure 46 is supported by a first bearing 50. A second intermediate gear 44 side end part in the intermediate gear structure 46 is supported by a second bearing 52.SELECTED DRAWING: Figure 7A

Description

  The present invention relates to an actuator.

  The following Patent Document 1 discloses an actuator provided with a speed reduction mechanism. This actuator decelerates the rotational speed of a DC motor and the rotation shaft of the DC motor at a predetermined reduction ratio and transmits the reduced speed to the output shaft. And a mechanism. The speed reduction mechanism includes a worm provided on the rotating shaft of the DC motor, a worm gear meshing with the worm, a bevel gear provided coaxially with the worm gear and capable of rotating integrally with the worm gear, and an output And a crown gear which is provided so as to be integrally rotatable with the shaft and meshes with the bevel gear.

Special table 2003-529731 gazette

  However, in the actuator described in Patent Document 1, the worm gear and the bevel gear are cantilevered on the shaft extending from the bracket. Therefore, in order to suppress the axial displacement of the worm gear and the bevel gear during the operation of the actuator, it may be necessary to take measures such as increasing the rigidity of the shaft extended from the bracket. As a result, it is conceivable that the speed reduction mechanism is enlarged, and as a result, the size of the actuator provided with the speed reduction mechanism is increased.

  In view of the above facts, an object of the present invention is to obtain an actuator capable of suppressing an increase in size.

  The actuator according to claim 1, a motor having a rotating shaft, an output shaft disposed coaxially with the rotating shaft, a rotating shaft side gear provided to be rotatable integrally with the rotating shaft, and the output shaft An output shaft side gear provided so as to be integrally rotatable, meshed with the rotary shaft side gear and the output shaft side gear, provided between the rotary shaft side gear and the output shaft side gear, and a first intermediate gear; An intermediate gear structure having a second intermediate gear provided so as to be integrally rotatable with the first intermediate gear and disposed radially outside the rotation shaft with respect to the first intermediate gear; and in the intermediate gear structure A first bearing that supports an end portion on the first intermediate gear side; and a second bearing that supports an end portion on the second intermediate gear side in the intermediate gear structure.

  According to the actuator of the first aspect, when the rotation shaft of the motor rotates, the rotation shaft side gear rotates. When the rotation shaft side gear rotates, the first intermediate gear that meshes with the rotation shaft side gear rotates together with the second intermediate gear. That is, the intermediate gear structure rotates. Further, when the intermediate gear structure rotates, the output shaft side gear that meshes with the second intermediate gear of the intermediate gear structure rotates. As a result, the output shaft rotates. By the way, in the configuration in which the intermediate gear structure is cantilevered, the thickness of the portion that supports the intermediate gear structure is increased in order to suppress misalignment of the intermediate gear structure during operation of the actuator, or It may be necessary to increase the rigidity by increasing the diameter of the intermediate gear structure. However, in the present invention, the end portion on the first intermediate gear side and the end portion on the second intermediate gear side in the intermediate gear structure are respectively supported by the first bearing and the second bearing. That is, the intermediate gear structure is supported at both ends by the first bearing and the second bearing. For this reason, compared with the structure in which the intermediate gear structure is cantilevered, it is possible to prevent the portion that supports the intermediate gear structure from becoming larger or the intermediate gear structure from being radially thickened. . Thereby, in this invention, it can suppress that the physique of an actuator enlarges.

  According to a second aspect of the present invention, in the actuator according to the first aspect, the outer diameter of the second bearing is set larger than the outer diameter of the first bearing.

  According to the actuator of claim 2, the durability of the actuator is improved by setting the diameter of the second bearing that supports the thrust force generated in the intermediate gear structure to be larger than the diameter of the first bearing. Can be improved.

  The actuator according to claim 3 is the actuator according to claim 1 or 2, wherein the rotating shaft side gear, the output shaft side gear, and the intermediate gear structure are accommodated in a gear housing, At least one of the gear housing, the second bearing, and the intermediate gear component is provided with a restricting portion that restricts movement of the intermediate gear component relative to the gear housing toward the first intermediate gear.

  According to the actuator of the third aspect, by having the restricting portion, the movement of the intermediate gear structure to the first intermediate gear side can be restricted.

  According to a fourth aspect of the present invention, in the actuator according to the third aspect, the restricting portion is provided on the second bearing side.

  According to the actuator of the fourth aspect, by arranging the restricting portion at the above position, a space for providing the restricting portion can be easily secured.

  The actuator according to claim 5 is the actuator according to claim 4, wherein the restriction portion is provided in the second bearing, and the restriction portion is provided between the gear housing and a pressing member attached to the gear housing. Is arranged.

  According to the actuator of the fifth aspect, the displacement of the second bearing relative to the gear housing can be suppressed when a thrust force is input from the intermediate gear structure to the second bearing. Further, the second bearing is disposed between the gear housing and the pressing member so that the second bearing is fixed to the gear housing, so that the intermediate gear structure is rotated in the direction of the rotation axis. Can be effectively suppressed via the second bearing.

  The actuator according to claim 6 is the actuator according to any one of claims 1 to 5, wherein the first intermediate gear is a cross-sectional view cut along an axial direction of the rotating shaft and the output shaft. The output shaft side end is disposed on the output shaft side with respect to the motor side end of the output shaft side gear.

  According to the actuator of the sixth aspect, by disposing the first intermediate gear and the output shaft side gear as described above, it is possible to suppress the clearance between the motor and the output shaft side gear from being widened. it can. Thereby, in this invention, it can suppress that the dimension to the axial direction of an actuator increases.

  The actuator according to claim 7 is the actuator according to any one of claims 1 to 6, wherein the direction of the thrust force generated when the rotating shaft side gear and the first intermediate gear mesh with each other is The rotary shaft side gear, the first intermediate gear, the second intermediate gear, and the output shaft side so as to be in a direction opposite to the direction of the thrust force generated when the second intermediate gear and the output shaft side gear mesh with each other. The gear angle is set.

  According to the actuator of the seventh aspect, the thrust force input from the intermediate gear structure to the first bearing or the second bearing is reduced by setting the direction of the thrust force generated in the intermediate gear structure as described above. can do. Thereby, in this invention, durability of an actuator can be improved.

  The actuator according to claim 8 is the actuator according to any one of claims 1 to 7, wherein the motor includes a stator and a rotor disposed on a radially inner side of the stator. The dimension of the stator in the axial direction of the rotating shaft is set shorter than the dimension of the stator in the radial direction of the rotating shaft.

  According to the actuator of the eighth aspect, by setting the dimension of the stator of the motor as described above, it is possible to suppress an increase in the dimension of the actuator in the axial direction.

  The actuator according to a ninth aspect is the actuator according to any one of the first to eighth aspects, wherein the rotation axis direction of the intermediate gear component and the rotation axis direction of the rotation shaft are orthogonally arranged. ing.

  According to the actuator of the ninth aspect, the rotational axis direction of the rotary shaft of the actuator can be shortened by arranging the intermediate gear component and the rotary shaft direction of the rotary shaft as described above.

It is the disassembled perspective view seen from the actuator output-shaft side. It is a disassembled perspective view which decomposes | disassembles and shows the actuator shown by FIG. It is a perspective view which shows a motor. It is a perspective view which shows a deceleration mechanism. It is a top view which shows a deceleration mechanism. FIG. 6 is a side sectional view showing a section of the actuator cut along line 6-6 shown in FIG. 1. It is an expanded sectional view which expands and shows the part to which a pair of bearing was fixed in the gear housing cover. FIG. 7 is a plan sectional view showing a section of the actuator cut along the line 7A-7A shown in FIG. 1. FIG. 7B is an enlarged side cross-sectional view showing an enlarged cross section of a part of the actuator cut along line 7B-7B shown in FIG. 7A. It is a top view which shows the circuit board etc. with which the sensor magnet for detecting the rotation speed of an output shaft, and a Hall element were mounted. It is an expanded sectional side view corresponding to FIG. 7B which expands and shows the site | part in which the sensor magnet was provided. It is a top view corresponding to FIG. 8A which shows the circuit board of the actuator which concerns on a modification, a housing main body, etc. FIG.

  The actuator 10 which concerns on embodiment of this invention is demonstrated using FIGS. 1-8A. In addition, the arrow Z direction, the arrow R direction, and the arrow C direction that are appropriately shown in the drawing respectively indicate the axial direction, the radial direction, and the circumferential direction of the motor 12 that constitutes a part of the actuator. In addition, hereinafter, when only the axial direction, the radial direction, and the circumferential direction are indicated, the axial direction, radial direction, and circumferential direction of the motor 12 are indicated unless otherwise specified. Further, the axial direction, the radial direction, and the circumferential direction of the motor 12 coincide with the axial direction, the radial direction, and the circumferential direction of the rotating shaft 14 of the motor 12 and the output shaft 16 of the actuator 10, respectively.

  As shown in FIGS. 1 and 2, the actuator 10 of the present embodiment is an actuator of a type in which the rotating shaft 14 and the output shaft 16 of the motor 12 are arranged coaxially, and as shown in FIG. 2. The actuator 10 includes a motor 12 and a speed reduction mechanism 18 that reduces the rotation of the rotating shaft 14 of the motor 12 at a predetermined speed reduction ratio and transmits it to the output shaft 16.

  As shown in FIG. 3, the motor 12 is an inner rotor type 10-pole 12-slot brushless motor. The motor 12 includes a stator 20 that generates a rotating magnetic field, and a rotation in which the stator 20 is fielded. And a rotor 22 that is rotated by a magnetic field.

  The stator 20 includes a stator core 26 having twelve teeth portions 24 arranged at equal intervals along the circumferential direction, and conductive windings wound around the teeth portions 24 of the stator core 26. And 12 coils 28 formed by winding (concentrated winding). A rotating magnetic field is generated by switching the energization of each coil 28. The stator 20 is fixed to a motor housing 30 formed in a hat shape with one axial side (arrow Z direction side) open, and as shown in FIGS. 1 and 2, the motor housing 30. Is fixed to a gear housing 54 described later via bolts 32. As shown in FIG. 3, in this embodiment, the dimension H in the axial direction of the stator 20 is set shorter than the dimension D in the radial direction of the stator 20.

  As shown in FIG. 6A, the rotor 22 arranged on the inner side in the radial direction of the stator 20 includes a rotor core 34 formed in a columnar shape, and a rotation shaft fixed to an axial center portion of the rotor core 34. 14 and ten magnets 27 (see FIG. 6A) fixed to the outer peripheral portion of the stator core 26. The rotor 22 is supported by the motor housing 30 and a gear housing 54 described later via two bearings 36. In the present embodiment, a surface magnet type (SPM) that fixes the magnet 27 to the outer peripheral surface of the rotor core 34 is used. However, the present invention is not limited to this, and the magnet 27 is not limited to this. The interior permanent magnet (IPM) may be used.

  As shown in FIG. 2, the speed reduction mechanism 18 includes a rotation shaft side gear 38 provided so as to be integrally rotatable with the rotation shaft 14, an output shaft side gear 40 provided so as to be rotatable integrally with the output shaft 16, and rotation. A pair of intermediate gears provided between the shaft side gear 38 and the output shaft side gear 40 and having a first intermediate gear 42 that meshes with the rotary shaft side gear 38 and a second intermediate gear 44 that meshes with the output shaft side gear 40. The structure 46 is comprised.

  As shown in FIG. 3 and FIG. 4, the rotating shaft side gear 38 is a worm formed by rolling the end portion on one side in the axial direction of the metallic rotating shaft 14 as an example. . Note that a worm formed using a resin material or the like may be attached to the end of the rotating shaft 14 in the axial direction.

  As shown in FIGS. 4 and 5, the output shaft side gear 40 is provided on the outer peripheral portion of the disc portion 16 </ b> A provided at the end of the output shaft 16 on the other side in the axial direction. The shaft side gear 40 and the output shaft 16 can rotate together. The output shaft side gear 40 is a hypoid gear that has 45 teeth and is gradually narrowed toward the other side in the axial direction in a side view. Furthermore, in the present embodiment, the other end in the axial direction of the output shaft side gear 40, that is, the other end in the axial direction of the output shaft side gear 40 (the tooth tip 40 </ b> A of the output shaft side gear 40) is the output shaft 16. It is located on the other axial side with respect to the other axial surface of the disc part 16A.

  The pair of intermediate gear constituent bodies 46 is provided between the rotary shaft side gear 38 and the output shaft side gear 40, and the pair of intermediate gear constituent bodies 46 is configured so that the rotary shaft 14 and the output shaft 16 are viewed in the axial direction. It is arranged in a point object with the center as the object center and is arranged in parallel with each other. The intermediate gear structure 46 includes a metal rod-shaped shaft portion 48 extending in a direction orthogonal to the axial direction, a first intermediate gear 42 and a first intermediate gear 42 provided on one side and the other side of the shaft portion 48 in the longitudinal direction, respectively. 2 intermediate gears 44.

  The end of one side in the longitudinal direction of the shaft portion 48 is a first bearing fixing portion 48A to which an inner race of the first bearing 50 as the first bearing is fixed by press fitting, and the other end in the longitudinal direction of the shaft portion 48 This end portion is a second bearing fixing portion 48B to which an inner race of a second bearing 52 as a second bearing having a diameter larger than that of the first bearing 50 is fixed by press-fitting. In the present embodiment, the axial end portions of the shaft portion 48 are caulked at four locations along the circumferential direction, whereby the first bearing 50 and the second bearing 52 are connected to the first bearing fixing portion 48A and the second bearing. It does not come off the fixing portion 48B (see FIG. 7B). In addition, an intermediate portion between the portion where the first intermediate gear 42 is provided and the portion where the second intermediate gear 44 is provided in the shaft portion 48 is smaller in diameter than the outer diameters of the first intermediate gear 42 and the second intermediate gear 44. The connection portion 48 </ b> C. Further, as shown in FIG. 7B, in this embodiment, a flange portion 52B as a restricting portion is formed at the end portion on the one axial side of the outer race 52A of the second bearing 52.

  As shown in FIGS. 4 and 5, the first intermediate gear 42 is a worm wheel having 17 teeth and meshing with the rotary shaft side gear 38. The first intermediate gear 42 has a shaft portion. The first bearing fixing portion 48A is provided on the other side in the longitudinal direction of the shaft portion 48 (on the second bearing fixing portion 48B side). In the present embodiment, the first intermediate gear 42 is made of resin, and the first intermediate gear 42 is integrally rotated together with the shaft portion 48 by fixing the first intermediate gear 42 to the shaft portion 48. It is possible to do. Further, when the output shaft 16 of the motor 12 rotates clockwise as viewed from one side in the axial direction (when the output shaft 16 rotates in the direction of the arrow CW), the thrust force F1 due to the engagement between the rotary shaft side gear 38 and the first intermediate gear 42 is generated. It occurs in the intermediate gear structure 46. The direction of the thrust force F1 of the rotary shaft side gear 38 is such that the direction from the longitudinal side of the shaft portion 48 is directed to the other side (from the first bearing fixing portion 48A side to the second bearing fixing portion 48B side). An angle with respect to the axial direction of the rotating shaft 14 and an angle with respect to the axial direction of the shaft portion 48 of the first intermediate gear 42 are set.

  The second intermediate gear 44 is a hypoid pinion gear having 13 teeth and meshing with the output shaft side gear 40. The second intermediate gear 44 is one side in the longitudinal direction of the shaft portion 48 (first bearing fixing). It is formed so as to narrow toward the part 48A side). The second intermediate gear 44 is provided on one side in the longitudinal direction of the shaft portion 48 (on the first bearing fixing portion 48A side) with respect to the second bearing fixing portion 48B of the shaft portion 48. In the present embodiment, the second intermediate gear 44 is formed in the above-described portion of the shaft portion 48 by rolling a part of the shaft portion 48. Further, when the output shaft 16 of the motor 12 rotates clockwise as viewed from one side in the axial direction (when the output shaft 16 rotates in the direction of the arrow CW), the thrust force F2 due to the engagement between the second intermediate gear 44 and the output shaft side gear 40 is generated. It occurs in the intermediate gear structure 46. The direction of the thrust force F2 is such that the direction of the second intermediate gear 44 is from the other longitudinal side of the shaft portion 48 toward one side (from the second bearing fixing portion 48B side to the first bearing fixing portion 48A side). An angle with respect to the axial direction of the shaft portion 48 and an angle with respect to the radial direction of the output shaft 16 of the output shaft side gear 40 are set. That is, the rotation shaft side gear 38, the first intermediate gear 42, the second intermediate gear 44, and the output shaft side so that the direction of the thrust force F2 generated in the intermediate gear component 46 and the direction of the thrust force F1 are opposite to each other. The angle of the gear 40 is set. Further, in the present embodiment, the thrust force F1 generated in the intermediate gear structure 46 is smaller than the thrust force F2 when the actuator 10 is operated.

  As shown in FIG. 6A, the speed reduction mechanism 18 described above is disposed in a gear housing chamber 56 formed in a gear housing 54 provided on one axial side of the motor 12. The gear housing 54 forming the gear housing chamber 56 includes a gear housing body 58 formed in a box shape with the output shaft 16 side open, and a gear housing cover 60 that closes the open end of the gear housing body 58. Yes.

  A rotation shaft insertion hole 58 </ b> A through which the rotation shaft 14 is inserted is formed at the radial center portion of the gear housing main body 58. Further, as shown in FIG. 7A, a pair of intermediate gear components 46 are accommodated on one side and the other side in the radial direction across the center of the rotation shaft insertion hole 58A in the gear housing main body 58. An intermediate gear component housing portion 58B is provided. Further, a first bearing support hole 58C into which the outer race of the first bearing 50 is loosely inserted is formed at one end (in the radial direction) of the intermediate gear structure housing portion 58B. Further, as shown in FIG. 7B, a portion 52C where the flange portion 52B is not formed in the outer race 52A of the second bearing 52 is loosely inserted into the other end (radially outer side) of the intermediate gear component housing portion 58B. A second bearing support hole 58D is formed. Then, the intermediate gear structure 46 to which the first bearing 50 and the second bearing 52 are attached is inserted into the second bearing support hole 58D, and the flange portion 52B of the second bearing 52 is the peripheral edge of the second bearing support hole 58D. By abutting against the portion 58E, the movement of the second bearing 52 to the inside of the gear housing 54 (movement toward the first intermediate gear 42) is restricted. Further, the second bearing pressing member 62 as a pressing member is fixed to the gear housing main body 58 via a bolt 64 (see FIG. 2), so that the flange portion 52B of the second bearing 52 becomes the second bearing support hole 58D. It is arranged between the peripheral portion 58 </ b> E and the second bearing pressing member 62. As a result, the intermediate gear structure 46 to which the first bearing 50 and the second bearing 52 are fixed is attached to the gear housing main body 58. Further, the flange portion 52B of the second bearing 52 is disposed between the peripheral edge portion 58E of the second bearing support hole 58D and the second bearing pressing member 62, so that one side and the other side in the longitudinal direction of the shaft portion 48 are provided. It is possible for the second bearing 52 to take charge of the thrust force. As shown in FIG. 1, a lower rib 58 </ b> F for rigidity adjustment is erected on the outer peripheral portion of the gear housing main body 58.

  As shown in FIG. 6A, a pair of bearings 66 that support the output shaft 16 and are arranged adjacent to each other in the axial direction are fixed to the central portion of the gear housing cover 60 in the radial direction. More specifically, a bearing insertion portion 60 </ b> C formed in a cylindrical shape is provided in the center portion of the gear housing cover 60 in the radial direction. In addition, a flange-like bearing contact portion 60D that protrudes radially inward is provided at the end on one axial side of the bearing insertion portion 60C. The pair of bearings 66 are inserted into the bearing insertion portion 60C from the other side in the axial direction toward one side, so that the outer race of the bearing 66 disposed on the one side in the axial direction is brought into contact with the bearing contact portion 60D. The Then, the portion on the other side in the axial direction of the bearing insertion portion 60C (the portion indicated by reference numeral 60E (see also FIG. 6B)) is caulked so that the pair of bearings 66 does not come out of the bearing insertion portion 60C. Yes. A washer 68 is interposed between the inner race of the bearing 66 disposed on the other axial side of the pair of bearings 66 and the disc portion 16A provided on the other axial side of the output shaft 16. ing. Further, the holding member 70 is attached to the output shaft 16 in a state where the output shaft 16 is inserted through the inner race of the pair of bearings 66. As a result, the inner race of the pair of bearings 66 is sandwiched between the holding member and the disk portion 16 </ b> A of the output shaft 16. As a result, the output shaft 16 is prevented from coming out of the pair of bearings 66. By adopting the above configuration, the movement of the output shaft 16 in the axial direction with respect to the gear housing cover 60 is restricted. Further, in addition to being able to disperse the axial load applied to the output shaft 16 to the gear housing cover 60 via the bearing 66, the load transmitted to the gear housing cover 60 is a bolt 74 (FIG. 2) described later. To the gear housing main body 58 via the reference). Further, a cap 72 having an insertion hole through which the output shaft 16 is inserted is attached to the gear housing cover 60. Thereby, it is suppressed that the water droplet etc. which adhered to the actuator 10 penetrate | invade toward the bearing 66 side. As shown in FIG. 1, the gear housing cover 60 is provided with an upper rib 60 </ b> A that reinforces a portion where the pair of bearings 66 are fixed. In addition, the gear housing cover 60 is provided with three boss portions 60 </ b> B that are arranged at intervals along the circumferential direction. A bolt (not shown) is screwed into the three boss portions 60B, so that the actuator 10 can be fixed to a fixed portion or the like of the vehicle.

  The gear housing cover 60 described above is fixed to the gear housing body 58 via bolts 74 (see FIG. 2), so that the rotation constituting the speed reduction mechanism 18 is established between the gear housing cover 60 and the gear housing body 58. A gear housing chamber 56 is formed in which the shaft side gear 38, the intermediate gear structure 46, and the output shaft side gear 40 are housed. In the state where the rotary shaft side gear 38, the intermediate gear component 46 and the output shaft side gear 40 are accommodated in the gear accommodating chamber 56, the end of the first intermediate gear 42 on the output shaft 16 side (of the first intermediate gear 42. The tooth tip 42 </ b> A) is disposed on the output shaft 16 side with respect to the motor side end (the tooth tip 40 </ b> A of the output shaft side gear 40) of the output shaft side gear 40.

  Further, as shown in FIG. 8A, in this embodiment, the sensor magnet 76 as a detected portion for detecting the rotation speed and the rotation angle of the output shaft 16 and the detection portion for detecting the magnetism of the sensor magnet 76 are used. A circuit board 80 on which the Hall element 78 is mounted is provided.

  As shown in FIG. 8B, the sensor magnet 76 has a sensor magnet support member 90 at the end on the other side in the longitudinal direction of the shaft portion 48 of the intermediate gear component 46 (the end on the second bearing fixing portion 48B side). It is fixed through. The sensor magnet support member 90 includes a cylindrical press-fit portion 90A that is press-fit into a press-fit hole 48D formed at the end of the shaft portion 48 on the other side in the longitudinal direction. Further, the sensor magnet support member 90 is provided at one end of the press-fit portion 90A, and has a disc portion 90B formed in a disc shape whose axial direction is the axial direction of the press-fit portion 90A, and an outer peripheral portion of the disc portion 90B. The claw portion 90C is formed. The sensor magnet 76 is fixed to the sensor magnet support member 90 by holding the sensor magnet 76 by the claw portion 90C and the disc portion 90B. Further, in a state where the sensor magnet 76 is fixed to the sensor magnet support member 90, the press-fit portion 90A of the sensor magnet support member 90 is press-fitted into a press-fit hole 48D formed at the other end in the longitudinal direction of the shaft portion 48. . As a result, the sensor magnet 76 is fixed to the shaft portion 48, and the sensor magnet 76 can rotate together with the shaft portion 48.

  The circuit board 80 is fixed to the gear housing main body 58 via a circuit board support member (not shown) in a state of being arranged outside the gear housing 54 (outside the gear housing chamber 56). Further, a circuit board cover member (not shown) is attached to the gear housing main body 58, whereby the circuit board 80 is disposed in a sealed space formed between the gear housing main body 58 and the circuit board cover member. It has become so. Further, in a state where the circuit board 80 is fixed to the gear housing body 58, the Hall element 78 mounted on the circuit board 80 is disposed on the other side in the axial direction of the shaft portion 48 of the intermediate gear structure 46, and the sensor magnet. 76 and a predetermined clearance.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  As shown in FIGS. 1 to 3, according to the actuator 10 of the present embodiment, when the rotating shaft 14 of the motor 12 rotates, the rotating shaft side gear 38 rotates together with the rotating shaft 14. When the rotation shaft side gear 38 rotates, the first intermediate gear 42 that meshes with the rotation shaft side gear 38 rotates together with the second intermediate gear 44. That is, the intermediate gear structure 46 rotates. Further, when the intermediate gear component 46 rotates, the output shaft side gear 40 that meshes with the second intermediate gear 44 of the intermediate gear component 46 rotates. Thereby, the output shaft 16 rotates.

  By the way, in the configuration in which the intermediate gear structure 46 is cantilevered, the thickness of the portion that supports the intermediate gear structure 46 is reduced in order to suppress misalignment of the intermediate gear structure 46 when the actuator 10 is operated. It is conceivable that the rigidity needs to be increased by increasing or increasing the diameter of the intermediate gear structure 46.

  However, in this embodiment, as shown in FIG. 7A, the end on the first intermediate gear 42 side and the end on the second intermediate gear 44 side of the intermediate gear structure 46 are the first bearing 50 and the second bearing. 52 are respectively supported. That is, the intermediate gear structure is supported at both ends by the first bearing 50 and the second bearing 52. For this reason, as compared with the configuration in which the intermediate gear structure 46 is cantilevered, the portion that supports the intermediate gear structure 46 becomes larger, or the intermediate gear structure 46 becomes thicker in the radial direction. It is suppressed. Thereby, in this embodiment, it can suppress that the physique of the actuator 10 enlarges.

  Further, in the present embodiment, the durability of the actuator 10 is improved by setting the diameter of the second bearing 52 that supports the thrust force generated in the intermediate gear structure 46 to be larger than the diameter of the first bearing 50. Can be made.

  Further, in the present embodiment, the rotating shaft side gear 38, the first intermediate gear 42, and the second intermediate gear are arranged so that the direction of the thrust force F2 generated in the intermediate gear structure 46 is opposite to the direction of the thrust force F1. The thrust force (the resultant force of the thrust force F1 and the thrust force F2) input from the intermediate gear structure to the second bearing 52 is reduced by setting the angles of the shaft 44 and the output shaft side gear 40 with respect to a predetermined axis. can do. Thereby, in this embodiment, the durability of the actuator 10 can be improved.

  Further, in the present embodiment, as shown in FIG. 6A, in the state where the rotary shaft side gear 38, the intermediate gear component 46 and the output shaft side gear 40 are accommodated in the gear accommodating chamber 56, An end on the output shaft 16 side (tooth tip 42A of the first intermediate gear 42) is disposed on the output shaft 16 side with respect to a motor side end (tooth tip 40A of the output shaft side gear 40) of the output shaft side gear 40. ing. By disposing the first intermediate gear 42 and the output shaft side gear 40 as described above, it is possible to suppress the clearance between the motor 12 and the output shaft side gear 40 from becoming wide. Thereby, in this embodiment, it can suppress that the dimension to the axial direction of the actuator 10 increases.

  Furthermore, in this embodiment, as shown in FIG. 3, the dimension H in the axial direction of the stator 20 is set shorter than the dimension D in the radial direction of the stator 20. By setting the dimension of the stator 20 of the motor 12 as described above, it is possible to suppress an increase in the dimension of the actuator 10 in the axial direction.

  Further, in the present embodiment, as shown in FIGS. 4 to 8A, the pair of intermediate gear constituents 46 is provided between the rotation shaft side gear 38 and the output shaft side gear 40, so that the rotation is performed. The driving force of the shaft side gear 38 can be distributed to the pair of intermediate gear components 46 and transmitted to the output shaft side gear 40. Thereby, in this embodiment, the torque transmission capacity of the speed reduction mechanism 18 can be increased.

  Further, in the present embodiment, as shown in FIG. 8A, a sensor magnet 76 for detecting the rotation speed and rotation angle of the output shaft 16 is provided at the end of the intermediate gear structure 46. This suppresses an increase in the axial dimension of the actuator 10 as compared with the case where the sensor magnet 76 is provided on the other end (disk portion 16A) of the output shaft 16 in the axial direction. Can do. The rotation speed and rotation angle of the output shaft 16 are calculated by multiplying the rotation speed and rotation angle of the intermediate gear component 46 by the ratio between the second intermediate gear 44 and the output shaft gear 40. Also, by calculating the rotation speed and rotation angle of the output shaft 16 by the calculation, the detection accuracy (resolution) of the rotation speed and rotation angle of the output shaft 16 can be improved.

  In the present embodiment, the sensor magnet 76 is disposed at the end of the intermediate gear component 46 on the second intermediate gear 44 side in a state where the sensor magnet 76 is disposed on the opposite side of the second bearing 52 from the first bearing 50. It is attached via a magnet support member 90. Accordingly, it is possible to attach the sensor magnet 76 to the intermediate gear component 46 in a state where the first bearing 50 and the second bearing 52 are attached to the intermediate gear component 46. Thereby, it can be set as the shape of the sensor magnet 76 which is not restrained by the internal diameter of the 2nd bearing 52. FIG. That is, in the present embodiment, the design freedom (especially the size) of the sensor magnet 76 can be provided.

  Furthermore, in the present embodiment, the gear housing chamber 56 has a large capacity by not providing a space in the gear housing chamber 56 in which the circuit board 80 and the hall element 78 mounted on the circuit board 80 are disposed. As a result, an increase in the dimension of the actuator 10 in the axial direction can be suppressed.

  In the present embodiment, the rotation axis direction of the intermediate gear component 46 and the rotation axis direction of the output shaft 16 are arranged orthogonally. With this arrangement, the actuator 10 can be downsized in the axial direction.

  In this embodiment, the example in which the circuit board 80 on which the sensor magnet 76 for detecting the rotation speed and the rotation angle of the output shaft 16 and the Hall element 78 for detecting the magnetism of the sensor magnet 76 are mounted is provided. However, the present invention is not limited to this. For example, an actuator that does not need to control the rotation speed and rotation angle of the output shaft 16 may be configured without the circuit board 80 on which the sensor magnet 76 and the Hall element 78 are mounted.

  Moreover, although this embodiment demonstrated the example which provided the pair of intermediate gear structure 46 between the rotating shaft side gear 38 and the output shaft side gear 40, this invention is not limited to this. For example, a single intermediate gear structure 46 may be provided between the rotary shaft side gear 38 and the output shaft side gear 40. As described above, the number of intermediate gear components 46 may be set as appropriate in consideration of the torque transmission capacity of the speed reduction mechanism 18 and the like.

  Furthermore, in this embodiment, an example in which the actuator 10 is configured using the motor 12 in which the dimension H in the axial direction of the stator 20 is set shorter than the dimension D in the radial direction of the stator 20. However, the present invention is not limited to this. For example, you may comprise an actuator using the motor by which the dimension to the axial direction of a stator is set long compared with the dimension to the radial direction of the said stator. The actuator can also be configured using an outer rotor type brushless motor, a brushed DC motor, or the like.

  In the present embodiment, the rotation shaft side gear 38, the first intermediate gear 42, and the second intermediate gear are arranged so that the direction of the thrust force F2 generated in the intermediate gear structure 46 is opposite to the direction of the thrust force F1. Although the example which set the angle with respect to the predetermined axis | shaft of 44 and the output-shaft side gear 40 was demonstrated, this invention is not limited to this. The direction of the thrust force F2 and the direction of the thrust force F1 generated in the intermediate gear structure 46 may be set as appropriate in consideration of the processing cost of each gear constituting the speed reduction mechanism 18.

  Furthermore, in this embodiment, although the example which set the diameter of the 2nd bearing 52 larger than the diameter of the 1st bearing 50 was demonstrated, this invention is not limited to this. The diameters of the first bearing 50 and the second bearing 52 may be appropriately set in consideration of the life required for the first bearing 50 and the second bearing 52.

  In the present embodiment, in the state where the rotary shaft side gear 38, the intermediate gear component 46, and the output shaft side gear 40 are housed in the gear housing chamber 56, the end of the first intermediate gear 42 on the output shaft 16 side (the first gear). In the above description, the tooth tip 42A of the intermediate gear 42 is disposed on the output shaft 16 side with respect to the motor side end (the tooth tip 40A of the output shaft side gear 40) of the output shaft side gear 40. The present invention is not limited to this. Whether or not the first intermediate gear 42 and the output shaft side gear 40 are arranged as described above may be appropriately set in consideration of the reduction ratio of the reduction mechanism 18 and the like.

  Furthermore, in this embodiment, although the example which has arrange | positioned orthogonally the rotating shaft direction of the intermediate gear structure 46 and the rotating shaft direction of the output shaft 16 was demonstrated, this invention is not limited to this. For example, the intermediate gear structure 46 is inclined with respect to the direction orthogonal to the axial direction of the output shaft 16 so that the second intermediate gear 44 is disposed on the other side in the axial direction as compared with the first intermediate gear 42. It may be arranged.

  Further, in the present embodiment, the flange portion 52B of the second bearing 52 is disposed (sandwiched) between the peripheral portion 58E of the second bearing support hole 58D and the second bearing pressing member 62, whereby the first Although the example which comprised so that the movement with respect to the gear housing main body 58 of the intermediate gear structure 46 to which the bearing 50 and the 2nd bearing 52 were fixed was controlled was demonstrated, this invention is not limited to this. In other words, at least one of the second bearing 52 and the intermediate gear component 46 only needs to be provided with a restricting portion that restricts the movement of the intermediate gear component 46 relative to the gear housing body 58.

(Modification of the above embodiment)
Next, an actuator 82 according to a modification of the above embodiment will be described with reference to FIG. In addition, about the member and part which have the same function as the said embodiment, the code | symbol same as the said embodiment is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 9, the actuator 82 according to this modification includes a motor drive control unit 84 that controls the rotation of the motor 12, an output shaft angle detection unit 86 that detects the rotation speed and rotation angle of the output shaft 16, and Is provided. Further, a capacitor 88 as a circuit board mounting component is mounted (mounted) on the surface of the motor drive control unit 84 on the gear housing main body 58 side. A capacitor 88 attached to the motor drive control unit 84 and the output shaft side gear 40 are disposed so as to overlap in the axial direction. Further, in this embodiment, a part of the gear housing chamber 56 of the above embodiment is narrowed, so that the capacitor 88 is located on the side of one intermediate gear structure 46 (one intermediate gear) outside the gear housing chamber 56. It is arranged on the outer side in the radial direction of the structure 46.

  In the present modification described above, the capacitor 88 attached to the circuit board 80 and the output shaft side gear 40 are arranged so as to overlap in the axial direction, so that the capacitor 88 has a diameter of the actuator 10 with respect to the circuit board 80. Protruding outward in the direction is suppressed. Thereby, the enlargement to the radial direction of the actuator 10 can be suppressed.

  In the present modification, the example in which the capacitor 88 attached to the circuit board 80 and the output shaft side gear 40 are disposed so as to overlap in the axial direction has been described, but the present invention is not limited to this. For example, it is possible to suppress an increase in the size of the actuator 10 in the radial direction by arranging the heat sink and the transistor attached to the circuit board 80 and the output shaft side gear 40 so as to overlap in the axial direction.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 ... Actuator, 12 ... Motor, 14 ... Rotating shaft, 16 ... Output shaft, 20 ... Stator, 22 ... Rotor, 38 ... Rotating shaft side gear, 40 ... Output shaft side gear, 42 ... First intermediate gear, 44 ... Second intermediate gear, 46 ... Intermediate gear structure, 50 ... First bearing (first bearing), 52 ... Second bearing (second bearing), 52B ... Flange portion (regulator), 54 ... Gear housing, 62 ... second bearing pressing member (pressing member), D ... dimension in the radial direction of the stator, F1 ... thrust force, F2 ... thrust force, H ... dimension in the axial direction of the stator

Claims (9)

A motor having a rotating shaft;
An output shaft disposed coaxially with the rotating shaft;
A rotating shaft side gear provided to be rotatable integrally with the rotating shaft;
An output shaft side gear provided to be rotatable integrally with the output shaft;
The rotary shaft side gear and the output shaft side gear mesh with each other, provided between the rotary shaft side gear and the output shaft side gear, and provided so as to be integrally rotatable with the first intermediate gear and the first intermediate gear. An intermediate gear structure having a second intermediate gear disposed radially outside the rotating shaft with respect to the first intermediate gear;
A first bearing that supports an end of the intermediate gear structure on the first intermediate gear side;
A second bearing that supports an end of the intermediate gear structure on the second intermediate gear side;
Actuator equipped with.   The actuator according to claim 1, wherein an outer diameter of the second bearing is set larger than an outer diameter of the first bearing. The rotating shaft side gear, the output shaft side gear, and the intermediate gear component are housed in a gear housing,
At least one of the gear housing, the second bearing, and the intermediate gear component is provided with a restricting portion that restricts movement of the intermediate gear component relative to the gear housing toward the first intermediate gear. The actuator according to claim 1 or 2.   The actuator according to claim 3, wherein the restricting portion is provided on the second bearing side. The restricting portion is provided in the second bearing;
The actuator according to claim 4, wherein the restricting portion is disposed between the gear housing and a pressing member attached to the gear housing.   In a cross-sectional view cut along the axial direction of the rotating shaft and the output shaft, the output shaft side end of the first intermediate gear is more than the output shaft side with respect to the motor side end of the output shaft side gear. The actuator of any one of Claims 1-5 arrange | positioned at the side.   The direction of the thrust force generated when the rotating shaft side gear and the first intermediate gear mesh with each other is opposite to the direction of the thrust force generated when the second intermediate gear and the output shaft side gear mesh with each other. The actuator according to any one of claims 1 to 6, wherein angles of the rotating shaft side gear, the first intermediate gear, the second intermediate gear, and the output shaft side gear are set. The motor includes a stator and a rotor disposed on the radially inner side of the stator,
The dimension in the axial direction of the rotating shaft of the stator is set shorter than the dimension in the radial direction of the rotating shaft of the stator. The actuator described.   The actuator according to any one of claims 1 to 8, wherein a rotation axis direction of the intermediate gear component and a rotation axis direction of the rotation shaft are arranged orthogonal to each other.