JP2021045022A - Geared motor - Google Patents

Abstract

To achieve both the accuracy of detecting a placement angle by a magnetic sensor and the strength of a gear for a gear member used in a geared motor.SOLUTION: A geared motor includes a gear member in which a metal portion and a resin portion are integrated, and a magnetic sensor that detects that the gear member has reached a predetermined arrangement angle, and a tooth portion is formed in at least a part of the outer surface of the metal portion, a permanent magnet is embedded in the resin portion, and when the gear member is viewed from its axial direction, the permanent magnet is placed at a position away from the surrounding metal portion by at least half the length of the shortest transfer dimension passing through the center of the permanent magnet.SELECTED DRAWING: Figure 4

Description

The present invention relates to a geared motor, and more particularly to a geared motor capable of detecting the arrangement angle of a gear member by a magnetic sensor.

The following Patent Document 1 discloses a geared motor (1) including a magnetic sensor (33). In the geared motor of Patent Document 1, a permanent magnet (44) is fixed to the output unit (8, 40), and the position where the permanent magnet faces the magnetic sensor is detected as the rotation reference position (0 °) of the output unit. To do.

Japanese Unexamined Patent Publication No. 10-191616

As in Patent Document 1, a geared motor that detects the arrangement angle of a gear member with a magnetic sensor is known. Such a geared motor detects that the gear member has reached a predetermined arrangement angle by bringing a permanent magnet attached to the gear member close to the magnetic sensor on its orbit. A non-magnetic material such as a resin that does not interfere with the magnetism of the permanent magnet is generally used for the gear member to which the permanent magnet is attached. When a ferromagnetic material such as iron is used to increase the strength of the gear member, the direction of the magnetic flux of the permanent magnet is affected by iron, and the detection accuracy of the magnetic sensor may be impaired.

In view of the above problems, an object to be solved by the present invention is to achieve both the accuracy of detecting the arrangement angle by the magnetic sensor and the strength of the gear in the gear member used in the geared motor.

In order to solve the above problems, the geared motor of the present invention includes a gear member in which a metal portion and a resin portion are integrated, and a magnetic sensor that detects that the gear member has reached a predetermined arrangement angle. A tooth portion is formed on at least a part of the outer surface of the metal portion, a permanent magnet is embedded in the resin portion, and when the gear member is viewed from its axial direction, the permanent magnet is permanently formed. It is characterized in that it is arranged at a position away from the surrounding metal portion at least half the length of the shortest transfer dimension passing through the center of the magnet.

By forming the gear member with a metal portion and a resin portion and forming tooth portions on the metal portion, high strength can be obtained as a gear. By embedding a permanent magnet in the resin part, which is a non-magnetic material, and arranging the permanent magnet at a predetermined distance from the metal part, it is possible to achieve both the strength of the gear and the detection accuracy of the permanent magnet by the magnetic sensor. Become.

Further, it is preferable that the metal portion and the resin portion have a shape that engages with the gear member in the circumferential direction. By forming these into a shape that engages with each other in the circumferential direction, it is possible to prevent the metal portion and the resin portion from idling even when a large external force is applied to the gear member.

In such a configuration, for example, the metal portion is a member having a substantially annular shape, the resin portion is arranged in the ring of the metal portion, and the metal is formed on a part of the inner peripheral surface of the metal portion. A metal portion-side engaging portion is formed that protrudes inward in the radial direction of the portion or is recessed outward in the radial direction of the metal portion, and a resin corresponding to the shape of the metal-side engaging portion is formed on the outer peripheral surface of the resin portion. It is conceivable that the portion-side engaging portion is formed.

Further, it is preferable that the resin portion has a rotation amount limiting portion that prevents further rotation of the gear member in the same direction by coming into contact with another member when the gear member reaches a predetermined arrangement angle. Not only is the magnetic sensor detecting that the gear member has reached a predetermined arrangement angle, but the rotation range of the gear member is mechanically limited by the rotation amount limiting unit, for example, the gear is used by using the rotation amount limiting unit. It is possible to more reliably control the arrangement angle of the gear member, such as determining the initial position of the member.

In such a configuration, for example, when the direction along the axial direction of the gear member is up and down, an arc-shaped groove extending along the circumferential direction of the gear member is formed on the upper surface or the lower surface of the resin portion. Therefore, it is conceivable that a stopper member, which is another member whose position is fixed, is inserted into the groove portion. At this time, the resin portion is formed from a disk portion having a substantially circular plate surface facing up and down, a shaft portion which is a shaft body extending upward from the center of the upper surface of the disk portion, and a center of the lower surface of the disk portion. It is preferable to have a rib which is a thick portion protruding downward, and the groove portion is formed on the lower surface of the rib.

Further, the geared motor of the present invention has a shape in which the metal portion and the resin portion engage with each other in the circumferential direction and the vertical direction of the gear member when the direction along the axial direction of the gear member is up and down. It is preferable to have. By forming these into a shape that engages with each other in the circumferential direction and the vertical direction, it is possible to prevent the metal portion and the resin portion from idling or separating even when a large external force is applied to the gear member.

In such a configuration, for example, the metal portion has an annular portion having an annular shape and a shaft portion which is a shaft body arranged in the ring of the annular portion, and the annular portion and the shaft portion. Is connected by a plurality of arm portions extending radially from the outer peripheral surface of the shaft portion when the gear member is viewed from its axial direction, and the resin portion is formed between the annular portion and the shaft portion. It is conceivable that the resin portions are arranged so that the resin portions extend between the plurality of arm portions and above and below these arm portions.

Further, it is preferable that the metal portion and the resin portion are integrated by insert molding. Thereby, a complicated engaging structure of the metal portion and the resin portion can be realized flexibly and easily.

Further, the metal portion is preferably an iron-based sintered part. According to the geared motor of the present invention, even when the metal portion is made of iron, which is a ferromagnetic material, the influence of the metal portion on the magnetism of the permanent magnet is reduced, and the detection accuracy of the permanent magnet by the magnetic sensor is maintained.

As described above, according to the present invention, it is possible to achieve both the accuracy of detecting the arrangement angle by the magnetic sensor and the strength of the gear in the gear member used in the geared motor.

It is a perspective view of the geared motor which concerns on embodiment. It is a perspective plan view of a geared motor. It is a side view sectional view of a geared motor. It is a top view and a side view sectional view of an output part. It is a perspective view of the metal part which constitutes an output part. It is a perspective perspective view and the bottom view of the resin part which constitutes an output part. It is a side view sectional view which shows the modification of the engagement structure of a metal part and a resin part. It is a top view and the side view sectional view of the output part which concerns on other embodiment of a geared motor.

[Outline of configuration]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The geared motor 1 described below is a motor unit that uses a stepping motor 2 as a drive source and can control the amount of rotation of the output unit 33.

FIG. 1 is a perspective perspective view of the geared motor 1 according to the present embodiment. In the following description, "upper" and "lower" refer to directions parallel to the Z axis of the coordinate axis display drawn in FIG. 1 and the like, with the Z1 side being "upper" and the Z2 side being "lower". The "front" and "back" refer to directions parallel to the X axis of the same coordinate axis display, and the X1 side is "front" and the X2 side is "back".

The geared motor 1 reduces the rotation of the stepping motor 2 by a reduction gear train to drive the output unit 33. The case 90 that houses the components of the geared motor 1 is provided with an opening 911 that exposes the tip of the output unit 33 to the outside of the case. A fitting hole 521 having serrations formed on the inner surface is provided on the tip surface of the output unit 33. A connecting portion of another device (not shown) is fitted into the fitting hole 521. The connecting structure between the output unit 33 and the other device is not limited to the fitting hole 521 of the present embodiment, and can be appropriately changed according to the shape of the connecting portion of the other device.

Further, the geared motor 1 includes a hall IC 14 which is a magnetic sensor for detecting that the output unit 33 has reached a predetermined arrangement angle. A permanent magnet 15 is embedded in the output unit 33, and the hall IC 14 is arranged at a position where the permanent magnet 15 overlaps vertically (the permanent magnet 15 is on the upper side and the hall IC 14 is on the lower side) on the orbit around the permanent magnet 15. As a result, the geared motor 1 can detect and control the arrangement angle and the amount of rotation of the output unit 33 with reference to the position where the hall IC 14 and the permanent magnet 15 overlap. The magnetic sensor is not limited to the Hall IC 14 of the present embodiment, and may be a sensor using a coil or an MR (Magneto Resistive) element as long as it can detect a magnetic field (magnetic field).

[Power transmission mechanism]
FIG. 2 is a perspective plan view of the geared motor 1. As shown in FIG. 2, a first gear 31 and a second gear 32 forming a reduction gear train are arranged between the pinion gear 23 of the stepping motor 2 and the output unit 33. The first gear 31 and the second gear 32 are composite gears in which spur gears having different pitch circle diameters are integrated in the axial direction.

The pinion gear 23 meshes with the large-diameter gear portion 311 of the first gear 31, and the small-diameter gear portion 312 of the first gear 31 meshes with the large-diameter gear portion 321 of the second gear 32. The small-diameter gear portion 322 of the second gear 32 meshes with the tooth portion 41 formed on the outer peripheral surface of the metal portion 40 of the output portion 33. The outer diameter of the metal portion 40 is larger than the outer diameter of the small diameter gear portion 322 of the second gear 32. As a result, the rotation of the pinion gear 23 is decelerated via the first gear 31 and the second gear 32, and the output unit 33 is rotated.

When the output unit 33 rotates, the distance between the permanent magnet 15 embedded in the output unit 33 and the hall IC 14 changes. The output value of the hall IC 14 is input to a control device (not shown), and the control device identifies from the output value of the hall IC 14 that the output unit 33 has reached a predetermined arrangement angle.

FIG. 3 is a sectional view taken along the line AA of the geared motor 1 of FIG. Hereinafter, the structure of the geared motor 1 will be described in more detail with reference to FIG.

The stepping motor 2 is a motor having an annular stator 22 and a rotor 21 arranged in the ring of the stator 22. The motor case that houses the rotor 21 and the stator 22 is composed of a cup-shaped stator cup 241 and a cover plate 242 that closes the opening thereof.

The stepping motor 2 of this embodiment is a two-phase stepping motor, and the stator 22 has a stator coil 221 and a claw yoke 222 composed of A phase and B phase. The rotor 21 is composed of a rotor magnet 211 which is a permanent magnet and a rotor support 212 which is an insert-molded resin shaft body. A shaft hole penetrating vertically is formed at the center of the diameter of the rotor support 212, and a support shaft 213 is inserted through the shaft hole. The support shaft 213 is a fixed shaft joined to the bottom surface of the stator cup 241 and the cover plate 242.

A pinion gear 23, which is a gear portion, is formed at the upper end of the rotor support 212. The cover plate 242 is provided with a window portion 243 that projects upward from the central portion thereof and has an opening on the side surface thereof. A part of the pinion gear 23 is exposed from the window portion 243 and meshes with the large diameter gear portion 311 of the first gear 31.

The output unit 33 is rotatably supported by the support shaft 17 in which a support shaft 17 which is a fixed shaft provided in the case 90 is fitted into a shaft hole 59 which is a recess formed in the lower surface thereof. As will be described in detail later, a groove portion 531 extending along the circumferential direction of the output portion 33 is formed on the lower surface of the output portion 33, and the groove portion 531 is a stopper which is a pin whose position in the case 90 is fixed. The member 16 is inserted.

A connector housing 11 to which a power line is connected is provided on the front surface of the case 90. The electric power supplied to the power supply terminal 12 of the connector housing 11 is input to the terminal 223 (see FIGS. 1 and 2) of the stepping motor 2 via the plurality of substrates 13 arranged in the case 90. Further, the above-mentioned hall IC 14 is mounted on the substrate 13. Although not shown in FIG. 1, the substrate 13 to which the power feeding terminal 12 is bonded and the substrate 13 to which the terminal 223 of the stepping motor 2 is bonded are electrically connected via a flexible substrate. There is.

The upper case 91, which is the upper lid of the case 90, is provided with an opening 911 and an opening rib 912, which is a portion in which the peripheral edge of the opening 911 is formed thickly in a cylindrical shape. The upper surface of the opening rib 912 has an annular recess on the inner peripheral surface side, and an O-ring 93 is arranged in the recess. The O-ring 93 closes the gap formed in the connecting portion between the geared motor 1 and the other device, and prevents moisture and dust from entering the mechanism. Further, in the geared motor 1, an annular rubber packing 94 is also provided at the fitting portion between the upper case 91 and the lower case 92, so that the airtightness of the geared motor 1 alone is ensured.

[Structure of output unit]
(Overall structure)
FIG. 4 is a plan view of the output unit 33 (FIG. 4 (a)) and a sectional view taken along the line BB of FIG. 4 (a) (FIG. 4 (b)). FIG. 5 is a perspective view of the metal portion 40 constituting the output portion 33. FIG. 6 is a perspective perspective view (FIG. 6 (a)) and a bottom view (FIG. 6 (b)) of the resin portion 50 constituting the output unit 33. Hereinafter, the structure of the output unit 33 will be described with reference to FIGS. 4-6.

The output unit 33 is a gear member in which a metal portion 40, which is an iron-based sintered part, and a resin portion 50, which is a non-magnetic material, are integrated.

A tooth portion 41 is formed on the outer peripheral surface of the metal portion 40, and a second gear 32 forming a reduction gear train is meshed with the tooth portion 41. The geared motor 1 has obtained high strength as a gear member by forming the tooth portion 41 on the metal portion 40, and there is a risk of deformation or tooth loss of the tooth portion 41 when a large external force is applied to the output portion 33. It is mitigating.

A cylindrical permanent magnet 15 is embedded in the resin portion 40 of the output portion 33. The permanent magnet 15 is arranged at a position where the distance d from the peripheral metal portion 40 to the portion closest to the permanent magnet 15 is equal to or greater than the length of the radius r of the permanent magnet 15. As a result, the influence of the metal portion 40 on the direction of the magnetic flux of the permanent magnet 15 is reduced, and the detection accuracy of the permanent magnet 15 by the Hall IC 14 is ensured. The permanent magnet 15 of this embodiment has a cylindrical shape and its radius r is equal over the entire circumference of the permanent magnet 15, but when a prismatic permanent magnet is used, for example, it is at least half the length of its shortest delivery dimension. Therefore, it is necessary to dispose of the metal portion 40 away from the surrounding metal portion 40.

As described above, in the geared motor 1, the output portion 33 is composed of the metal portion 40 and the resin portion 50, the tooth portion 41 is formed in the metal portion 40, and the permanent magnet 15 is embedded in the resin portion 50 which is a non-magnetic material. Further, by arranging the permanent magnet 15 at a predetermined distance from the metal portion 40, both the high strength of the output unit 33 as a gear member and the detection accuracy of the permanent magnet 15 by the hall IC 14 are compatible.

(Metal part and resin part engagement structure)
The metal portion 40 of this embodiment is a member having a substantially annular shape (see FIG. 5), and the resin portion 50 is provided in the ring of the metal portion 40. A convex portion 42 (engagement portion on the metal portion side) protruding inward in the radial direction of the metal portion 40 is formed on a part of the inner peripheral surface of the metal portion 40. Three convex portions 42 are formed at equal intervals in the circumferential direction of the metal portion 40. Depending on the viewpoint and interpretation, it can be considered that a concave portion recessed outward in the radial direction of the metal portion 40 is formed between the convex portion 42 and the convex portion 42 adjacent thereto. The resin portion 50 is integrated with the metal portion 40 by insert molding. Therefore, the resin portion 40 is inevitably formed with a recess 511 (engagement portion on the resin portion side) corresponding to the shape of the convex portion 42 of the metal portion 40. When the convex portion 42 and the concave portion 511 engage in the circumferential direction of the output portion 33, the metal portion 40 and the resin portion 50 rotate integrally in the circumferential direction.

FIG. 7 is a side sectional view showing another example of the engagement structure of the metal portion 40 and the resin portion 50. If undercut is allowed during molding of the metal portion 40, the metal portion 40 and the resin portion 50 are provided in the circumferential direction by providing a tapered portion 43 as shown in FIG. 7, for example, on the inner peripheral surface of the metal portion 40. Not only can it be engaged in the vertical direction. As a result, even when a force is applied to the metal portion 40 in the vertical direction, it is possible to prevent the metal portion 40 from falling off from the resin portion 50.

As described above, in the output unit 33 of this embodiment, the metal portion 40 and the resin portion 50 are integrated by insert molding, but the metal portion 40 and the resin portion 50 are engaged in the circumferential direction and / or the vertical direction thereof. The method of fitting is not limited to the structure in which the unevenness is fitted by insert molding. For example, it is conceivable that the metal portion 40 is caulked and fixed to the resin portion 50, or these are fixed with screws. Alternatively, it is conceivable to use a so-called snap-fit structure in which the resin portion 50 is provided with elastically deformable claws and the metal portion 40 is fixed by hooking the claws.

(Rotation amount control unit)
As shown in FIG. 6, the resin portion 50 of the present embodiment has a disc portion 51 having a substantially circular plate surface facing up and down, and a shaft which is a cylindrical shaft body extending upward from the center of the upper surface of the disc portion 51. It is composed of a portion 52 and a rib 53 which is a cylindrical thick portion protruding downward from the center of the lower surface of the disc portion 51. The thickness of the disk portion 51 and the metal portion 40 in the vertical direction are the same.

A rotation amount limit on the lower surface of the rib 53 prevents further rotation of the output unit 33 in the same direction by contacting the stopper member 16 (see FIG. 3) when the output unit 33 reaches a predetermined arrangement angle. A groove portion 531 which is a portion is formed. The groove portion 531 is an arc-shaped groove extending along the circumferential direction of the output portion 33. Strictly speaking, both ends of the groove portion 531 in the extending direction are rotation amount limiting portions.

The geared motor 1 not only detects that the output unit 33 has reached a predetermined arrangement angle by the hall IC 14, but also mechanically limits the rotation range of the output unit 33 by the groove portion 531 and the stopper member 16. For example, the output unit 33 is used to determine the initial position of the output unit 33, so that the arrangement angle of the output unit 33 can be more reliably grasped and controlled. The groove portion 531 also functions as a safety device for reducing runaway and malfunction of the geared motor 1. In this embodiment, the groove portion 531 is provided on the lower surface of the resin portion 50, but it is also possible to provide this on the upper surface of the resin portion 50.

The permanent magnet accommodating portion 54 of the output portion 33 projects downward from the lower surface of the disc portion 51. The rotatable range of the output unit 33 of this embodiment is limited by the groove portion 531 and even if the shape of the output unit 33 is asymmetric with respect to the rotation center line, vibration due to imbalance of centrifugal force is unlikely to occur. .. If the vertical thickness of the resin portion 40 is adjusted to the length of the permanent magnet 15 as a whole, the imbalance is reduced, but the material efficiency of the output portion 33 is reduced. The output portion 33 of the geared motor 1 is provided with a metal tooth portion 41, and sufficient strength can be obtained even with a thickness of about the disk portion 51. Therefore, the geared motor 1 intentionally accepts that the shape of the output unit 33 is asymmetrical, and enhances the material efficiency of the output unit 33. This is the same even when the permanent magnet accommodating portion 54 projects upward from the upper surface of the disc portion 51.

[Other Embodiments]
(Overall structure)
FIG. 8 is a diagram showing a structure of an output unit 33b, which is an output unit according to another embodiment of the geared motor. FIG. 8A is a plan view of the output unit 33b. FIG. 8B is a cross-sectional view taken along the line CC of FIG. 8A. Hereinafter, the structure of the output unit 33b will be described with reference to FIG. In the following description, the same components as those of the above-described embodiment will be designated by the same reference numerals as those of the above-described embodiments, and detailed description thereof will be omitted.

The output unit 33b is a gear member in which a metal portion 40b, which is an iron-based sintered part, and a resin portion 50b, which is a non-magnetic material, are integrated by insert molding. A tooth portion 461 is formed on the outer peripheral surface of the metal portion 40b, and a second gear 32 forming a reduction gear train is meshed with the tooth portion 461.

A permanent magnet 15 is embedded in the resin portion 50b of the output portion 33b. Also in the output unit 33b of the present embodiment, the permanent magnet 15 is arranged at a position where the distance d from the peripheral metal portion 40b to the portion closest to the permanent magnet 15 is equal to or greater than the length of the radius r of the permanent magnet 15. Has been done. Further, a groove portion 531 which is a rotation amount limiting portion is formed on the lower surface of the resin portion 50b.

(Metal part and resin part engagement structure)
The metal portion 40b has an annular portion 46 having an annular shape and a shaft portion 47 which is a shaft body arranged in the ring of the annular portion 46. The annular portion 46 and the shaft portion 47 are connected by a plurality of arm portions 48 extending radially from the outer peripheral surface of the shaft portion 47 when the output portion 33b is viewed in a plan view. Three arm portions 48 are formed at equal intervals in the circumferential direction of the metal portion 40b. As shown in FIG. 8B, the vertical thickness of the arm portion 48 is smaller than the vertical width of the annular portion 46 (the tooth width of the tooth portion 461).

A fitting hole 471 having serrations formed on the inner surface is provided on the tip surface of the shaft portion 47. A connecting portion of another device (not shown) is fitted into the fitting hole 471. The connecting structure between the output unit 33b and the other device is not limited to the fitting hole 471 of the present embodiment, and the shape of the shaft portion 47 can be appropriately changed according to the shape of the connecting portion of the other device.

The resin portion 50b is provided between the annular portion 46 and the shaft portion 47 of the metal portion 40b. The resin portion 50b is filled so that the upper and lower surfaces thereof are flat with the upper and lower surfaces of the annular portion 46 without a step, except for the groove portion 531. In this embodiment, the length of the permanent magnet 15 in the vertical direction is also the same as the tooth width of the tooth portion 461. The resin portion 50b extends between the arm portions 48 and above and below the arm portions 48, whereby the metal portion 40b and the resin portion 50b engage with each other in the circumferential direction and the vertical direction of the output portion 33b.

In the output portion 33b, not only the tooth portion 461 that meshes with the second gear 32 but also the shaft portion 47 to which the connecting portion of another device is fitted is made of metal, and the tooth portion 41 (annular portion 46) and the shaft portion It is connected to 47 by a metal arm portion 48. As a result, not only the strength of either the input unit or the output unit of the output unit 33b, but also the strength of the entire force propagation path in the output unit 33b is increased. By holding the permanent magnet 15 in the resin portion 50b using the space provided between the arm portions 48, the influence of the metal portion 40b on the direction of the magnetic flux of the permanent magnet 15 is reduced, and the hall IC14 The detection accuracy of the permanent magnet 15 is ensured.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

1: Geared motor, 14: Hall IC (magnetic sensor), 15: Permanent magnet, 16: Stopper member, 2: Stepping motor, 31: 1st gear, 32: 2nd gear (other gear member), 33, 33b : Output part (gear member), 40, 40b: Metal part, 41, 461: Tooth part, 42: Convex part (metal part side engaging part), 43: Tapered part, 46: Ring part, 47: Shaft part 48: Arm part, 50, 50b: Resin part, 51: Disc part, 511: Recessed part (resin part side engaging part), 52: Shaft part, 53: Rib, 531: Groove part (rotation amount limiting part), 54 : Permanent magnet housing

Claims (11)

A gear member in which a metal part and a resin part are integrated,
A magnetic sensor for detecting that the gear member has reached a predetermined arrangement angle is provided.
A tooth portion is formed on at least a part of the outer surface of the metal portion.
A permanent magnet is embedded in the resin part,
When the gear member is viewed from its axial direction, the permanent magnet is arranged at a position away from the surrounding metal portion by at least half the length of the shortest transfer dimension passing through the center of the permanent magnet. A geared motor featuring. The geared motor according to claim 1, wherein the metal portion and the resin portion have a shape of engaging with each other in the circumferential direction of the gear member. The metal part is a member having a substantially annular shape.
The resin portion is arranged in the ring of the metal portion, and the resin portion is arranged in the ring.
A metal portion-side engaging portion is formed on a part of the inner peripheral surface of the metal portion, which protrudes inward in the radial direction of the metal portion or is recessed outward in the radial direction of the metal portion.
The geared motor according to claim 2, wherein a resin portion-side engaging portion corresponding to the shape of the metal-side engaging portion is formed on the outer peripheral surface of the resin portion. The resin portion has a rotation amount limiting portion that prevents further rotation of the gear member in the same direction by coming into contact with another member when the gear member reaches a predetermined arrangement angle. The geared motor according to any one of claims 1 to 3. When the direction along the axial direction of the gear member is up and down, an arc-shaped groove extending along the circumferential direction of the gear member is formed on the upper surface or the lower surface of the resin portion.
The geared motor according to claim 4, wherein a stopper member, which is another member whose position is fixed, is inserted into the groove. The resin portion includes a disc portion having a substantially circular plate surface facing up and down, a shaft portion which is a shaft body extending upward from the center of the upper surface of the disc portion, and a shaft portion extending downward from the center of the lower surface of the disc portion. It has ribs, which are thick parts,
The geared motor according to claim 5, wherein the groove is formed on the lower surface of the rib. The resin portion has a magnet accommodating portion in which the permanent magnet is accommodated.
Any one of claims 4 to 6, wherein the magnet accommodating portion projects upward or downward from the resin portion when the direction along the axial direction of the gear member is set up and down. Geared motor. Claim 1 is characterized in that the metal portion and the resin portion are in a shape that engages in the circumferential direction and the vertical direction of the gear member when the direction along the axial direction of the gear member is up and down. The geared motor described in. The metal portion has an annular portion having an annular shape and a shaft portion which is a shaft body arranged in the ring of the annular portion.
The annular portion and the shaft portion are connected by a plurality of arm portions extending radially from the outer peripheral surface of the shaft portion when the gear member is viewed from the axial direction thereof.
The geared motor according to claim 8, wherein the resin portion is arranged between the annular portion and the shaft portion, and extends between the plurality of arm portions and above and below the arm portions. .. The geared motor according to any one of claims 1 to 9, wherein the metal portion and the resin portion are integrated by insert molding. The geared motor according to any one of claims 1 to 10, wherein the metal portion is an iron-based sintered part.

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