JP6966264B2 - Geared motor - Google Patents

Description

The present invention relates to a geared motor that rotates an output member having a gear and a worm on the outer peripheral surface.

A geared motor for outputting a large torque from a motor is described in Patent Document 1. The geared motor of the same document transmits the rotation of a motor body having an output shaft, a fixed shaft parallel to the output shaft, a resin output member rotatably supported by the fixed shaft, and the rotation of the output shaft to the output member. It is equipped with a transmission mechanism. The output member includes a gear at one end of the fixed shaft in the axial direction on the outer peripheral surface thereof, and a worm on the other side of the gear. The transmission mechanism is a reduction gear mechanism. The rotation of the output shaft is transmitted to the gears of the output member via the transmission mechanism.

JP-A-2017-93104

When the output member is made of resin, the dimensional accuracy of the output member tends to decrease due to sink marks or the like generated when the output member is formed by injection molding.

In view of such a problem, an object of the present invention is to provide a geared motor including a resin output member that can be molded with high dimensional accuracy.

In order to solve the above problems, the geared motor according to the present invention transmits the rotation of the output shaft to the motor body including the output shaft, the fixed shaft, the output member rotatably supported by the fixed shaft, and the rotation of the output shaft. The output member has a transmission mechanism, and the output member is arranged on an inner cylinder portion having a shaft hole through which the fixed shaft penetrates and an outer peripheral side of the inner cylinder portion, and one of the axial directions of the fixed shaft is first. When the direction and the other are the second directions, the outer cylinder portion in which the gear is formed at the end portion of the outer peripheral surface in the first direction and the worm is formed in the second direction of the gear, the inner cylinder portion and the outer side. The transmission mechanism includes a plurality of ribs extending between the cylinders in the axial and radial directions to connect the inner cylinder and the outer cylinder, and the transmission mechanism transmits the rotation of the output shaft to the gear. The inner peripheral surface of the outer tubular portion includes a tapered first inner peripheral surface portion whose radial dimension increases from a predetermined position of the central portion of the output member in the axial direction toward the end in the first direction. A second inner peripheral surface portion having a taper whose radial dimension increases from the predetermined position toward the end surface in the second direction is provided , and the plurality of ribs have a molding gate connected to the end surface in the first direction. It is characterized by having a gate mark.

According to the present invention, the resin output member includes an outer cylinder portion having a gear and a worm on the outer peripheral surface, and an inner cylinder portion located inside the outer cylinder portion. Further, the outer cylinder portion and the inner cylinder portion are connected by a plurality of ribs. As a result, the output member is provided with a space between the inner cylinder portion, the outer cylinder portion, and the plurality of ribs, so that it is possible to prevent the output member from becoming thick. Therefore, when the output member is formed by injection molding, it is possible to prevent or suppress the deterioration of the dimensional accuracy of the output member due to sink marks or the like. Further, since the outer tubular portion is provided with a tapered first inner peripheral surface that expands toward the end in the first direction on the inner peripheral surface thereof, the portion of the outer tubular portion on which the gear is formed becomes thick. Easy to suppress. Therefore, it is easy to mold the gear with high accuracy. Further, when the output member is injection-molded, the resin can be injected into the mold from the ribbed portion.

In the present invention, the output member may be provided with a parting line mark of a molding die at the predetermined position. That is, in injection molding, as a mold for forming a space between the inner cylinder portion, the outer cylinder portion, and a plurality of ribs, a first mold and a second mold divided into two in the axial direction at a predetermined position. When is used, the output member is provided with a parting line mark corresponding to the party line of the first mold and the second mold at a predetermined position.

In the present invention, each of the plurality of ribs projects from the end face in the circumferential direction to the end face facing the circumferential direction around the axis, and exceeds the predetermined position from the end in the first direction toward the second direction. It is provided with an extending protruding portion, and the end of the protruding portion in the second direction can be continuous with the end face without a step via a curved surface. In this way, as the gate, a gate provided with a resin injection port corresponding to the combined area of the rib and the protruding portion when viewed from the axial direction can be used. Therefore, a gate having a wider resin injection port can be used as compared with the case where the rib does not have a protruding portion. Further, if the end of the protruding portion in the second direction is continuous with the end face of the rib via a curved surface without a step, a step may be formed between the end of the protruding portion in the second direction and the end face of the rib. In comparison, the fluidity of the resin is improved, so that it is possible to prevent cracks from occurring at the end portion of the protruding portion in the second direction due to a temperature change or the like.

In the present invention, it is desirable that the inclination of the first inner peripheral surface portion with respect to the axis line is larger than the inclination of the second inner peripheral surface portion with respect to the axis line. By doing so, it is possible to further prevent the portion of the outer cylinder portion where the gear is formed from becoming thick.

In the present invention, it is desirable that the tooth tip and the tooth bottom of the gear are located between the tooth tip and the tooth bottom of the worm when viewed from the axial direction. In this way, the inclination of the first inner peripheral surface portion with respect to the axis is made larger than the inclination of the second inner peripheral surface portion with respect to the axis while ensuring the thickness from the tooth bottom of the gear to the first inner peripheral surface portion. be able to.

In the present invention, the output member may be provided with an annular surface between the gear and the worm in the axial direction, and the annular surface may be located on the outer peripheral side of the tooth tip of the gear. .. If such an annular surface is provided, even if the gear and the member on the outer peripheral side of the annular surface come into contact with the output member, this member comes into contact with the annular surface and contact with the gear is avoided.

In the present invention, the first plate portion fixed to the end surface of the motor body on the side where the output shaft protrudes, the second plate portion facing the first plate portion in the axial direction, and the first plate portion. It is assumed that the frame includes a third plate portion that connects the first plate portion and the second plate portion, and the fixed shaft is bridged between the first plate portion and the second plate portion. be able to. In this way, it is easy to arrange the fixed shaft on the side where the output shaft of the motor body protrudes to support the output member.

According to the present invention, the output member is provided with a space between the inner cylinder portion, the outer cylinder portion, and the plurality of ribs. This makes it possible to prevent the output member from becoming thick. Further, the outer tubular portion of the output member includes a first inner peripheral surface having a taper that extends toward the end in the first direction in which the gear is formed. As a result, it is possible to prevent the portion where the gear is formed from becoming thick. Therefore, it is possible to prevent or suppress a decrease in the dimensional accuracy of the output member due to sink marks or the like generated when the output member is formed by injection molding. Further, since the outer tubular portion is provided with the first inner peripheral surface having a taper that extends toward the end in the first direction on the inner peripheral surface thereof, the portion of the outer tubular portion on which the gear is formed becomes thick. Easy to suppress. Therefore, it is easy to mold the gear with high accuracy.

It is an external perspective view of the geared motor to which this invention is applied. It is a perspective view of the geared motor which removed the cover which covers a transmission mechanism. It is a perspective view when the output member is seen from the 1st direction and the 2nd direction. It is a side view when the output member is seen from the direction orthogonal to the axis line. It is sectional drawing when the output member is cut along the axis. It is explanatory drawing of the molding method of an output member.

An example of a geared motor to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view of a geared motor to which the present invention is applied. FIG. 2 is a perspective view of a geared motor from which the cover covering the transmission mechanism has been removed. As shown in FIG. 1, the geared motor 1 is rotatably supported by a motor body 2, a frame 3 fixed to one side of the motor body 2, a fixed shaft 4 supported by the frame 3, and a fixed shaft 4. The output member 5 is provided. Further, the geared motor 1 includes a cover 6 that covers an end portion of the output member 5 on the motor body 2 side.

As shown in FIG. 2, the motor body 2 includes an output shaft 11 projecting toward the frame 3. The motor body 2 is a stepping motor. A power feeding unit 12 is provided on the side surface of the motor body 2. In the following description, the axis L direction of the fixed shaft 4 is the X direction, the side where the motor body 2 is located with respect to the frame 3 is the first direction X1, and the opposite direction is the second direction X2. The first direction X1 is the counter-output side of the motor body 2, and the second direction X2 is the output side of the motor body 2.

The frame 3 includes a first plate portion 15 fixed to the end of the motor body 2 in the second direction X2 by a method such as welding, a second plate portion 16 facing the first plate portion 15 in the X direction, and X. A third plate portion 17 extending in the direction and connecting the first plate portion 15 and the second plate portion 16 is provided. The first plate portion 15 is substantially rectangular. A hole 19 is formed in the first plate portion 15, and the output shaft 11 of the motor body 2 projects from the first plate portion 15 in the second direction X2 through the hole 19. A motor pinion 20 is attached to a portion of the output shaft 11 that protrudes from the first plate portion 15 in the second direction X2.

The fixed shaft 4 is bridged between the first plate portion 15 and the second plate portion 16. The shaft end portion of the fixed shaft 4 in the first direction X1 is fitted into a support hole (not shown) formed in the first plate portion 15. The shaft end portion of the fixed shaft 4 in the second direction X2 is fixed to the second plate portion 16 in a state of being fitted into the through hole 22 formed in the second plate portion 16. The fixed shaft 4 extends parallel to the output shaft 11 of the motor body 2.

The output member 5 extends linearly in the X direction. A fixed shaft 4 penetrates the output member 5. A gear 26, an annular surface 27, and a worm 28 are provided in this order on the outer peripheral surface of the output member 5 from the side of the first direction X1 to the side of the second direction X2. Details of the output member 5 will be described later.

A transmission mechanism 29 for transmitting the rotation of the output shaft 11 to the output member 5 is provided between the first plate portion 15 and the second plate portion 16. The transmission mechanism 29 is a reduction wheel train and includes a motor pinion 20 and a composite gear 31. The composite gear 31 includes a large-diameter gear 32 and a small-diameter gear 33 provided coaxially with the large-diameter gear 32 in the first direction X1 of the large-diameter gear 32. The composite gear 31 is rotatably supported by a support shaft 30 projecting from the first plate portion 15 in the X2 direction. The large-diameter gear 32 of the composite gear 31 meshes with the motor pinion 20. The small-diameter gear 33 of the composite gear 31 meshes with the gear 26 of the output member 5. Therefore, when the motor body 2 is driven, the rotation of the output shaft 11 is transmitted to the output member 5 via the transmission mechanism 29.

The cover 6 is fixed to the first plate portion 15. Further, the cover 6 is positioned on the third plate portion 17. A transmission mechanism 29 and a gear 26 of the output member 5 are housed inside the cover 6. As shown in FIG. 1, the annular surface 27 and the worm 28 of the output member 5 are exposed to the outside of the cover 6 from the opening 6a formed in the end surface of the cover 6 in the second direction X2.

(Details of output member)
FIG. 3A is a perspective view of the output member 5 viewed from the side of the first direction X1, and FIG. 3B is a perspective view of the output member 5 viewed from the side of the second direction X2. be. FIG. 4 is a side view of the output member 5 when viewed from a direction orthogonal to the axis L. FIG. 5 is a cross-sectional view of the output member 5 cut along the axis L.

The output member 5 is made of resin. The output member 5 is between an inner cylinder portion 35 having a shaft hole 25 through which the fixed shaft 4 penetrates, an outer cylinder portion 36 arranged on the outer peripheral side of the inner cylinder portion 35, and between the inner cylinder portion 35 and the outer cylinder portion 36. Is provided with a plurality of ribs 37 extending in the X direction and the radial direction to connect the inner cylinder portion 35 and the outer cylinder portion 36. The inner cylinder portion 35 and the outer cylinder portion 36 are arranged coaxially.

The inner cylinder portion 35 has a constant outer diameter dimension. The shaft hole 25 of the inner cylinder portion 35 has a constant inner diameter dimension. The inner cylinder portion 35 includes a protruding cylinder portion 35a projecting from the end of the outer cylinder portion 36 in the first direction X1 in the first direction X1 at the end on the side of the first direction X1.

A gear 26 is formed at an end portion of the outer peripheral surface of the outer tubular portion 36 in the first direction X1. A worm 28 is formed in the second direction X2 of the gear 26 on the outer peripheral surface of the outer tubular portion 36. On the outer peripheral surface of the outer tubular portion 36, the region where the worm 28 is formed in the X direction is longer than the region where the gear 26 is formed in the X direction, and is longer than the region of the annular surface 27 in the X direction. Further, the region where the worm 28 is formed in the X direction is longer than the region where the gear 26 is formed and the annular surface 27 are combined.

Further, as shown in FIG. 4, in the outer tubular portion 36, the outer diameter D1 (the tooth tip circle of the worm 28) of the region where the worm 28 is provided is the largest, and the outer diameter D2 of the annular surface 27 is the worm 28. Is smaller than the outer diameter D1 of the region provided with. The outer diameter D3 (the tooth tip circle of the gear 26) of the region where the gear 26 is provided is slightly smaller than the outer diameter D2 of the annular surface 27. When viewed from the X direction, the tooth tip 26a and the tooth bottom 26b of the gear 26 are located between the tooth tip 28a and the tooth bottom 28b of the worm 28.

As shown in FIG. 5, the inner peripheral surface 40 of the outer tubular portion 36 has a taper whose inner diameter dimension E1 becomes longer from a predetermined position P of the central portion of the output member 5 in the X direction toward the end of the first direction X1. 1 The inner peripheral surface portion 40a and the second inner peripheral surface portion 40b having a taper in which the inner diameter dimension E2 becomes longer from the predetermined position P toward the end in the second direction X2 are provided. The predetermined position P is at a position overlapping the region where the worm 28 is provided when viewed from a direction orthogonal to the axis L. At a predetermined position P on the inner peripheral surface 40 of the outer tubular portion 36, a parting line mark 41 of a molding die when the output member 5 is molded by injection molding remains. The inclination α1 of the first inner peripheral surface portion 40a with respect to the axis L is larger than the inclination α2 of the second inner peripheral surface portion 40b with respect to the axis L. Here, since the inner cylinder portion 35 has a constant outer diameter dimension, the inclination α1 of the first inner peripheral surface portion 40a with respect to the axis L is the inclination angle of the first inner peripheral surface portion 40a with respect to the outer peripheral surface of the inner cylinder portion 35. The inclination α2 of the second inner peripheral surface portion 40b with respect to the axis L is the inclination angle of the second inner peripheral surface portion 40b with respect to the outer peripheral surface of the inner tubular portion 35.

Six ribs 37 are provided at equal intervals around the axis L. As shown in FIG. 3A, a gate mark 42 to which a molding gate is connected when the output member 5 is molded by injection molding remains on the end surface of each rib 37 in the first direction X1. Each rib 37 is provided with projecting portions 43 projecting in the circumferential direction from each of these end faces on both end faces facing the circumferential direction around the axis L. More specifically, each rib 37 has a rectangular rib body 39 whose longitudinal direction is oriented in the radial direction when viewed from the X direction, and one of the circumferential directions from each of the end faces on both sides of the rib body 39 in the circumferential direction. A pair of projecting portions 43 projecting to the side and the other side are provided. Each protruding portion 43 includes an arc contour that protrudes in the circumferential direction when viewed from the X direction.

Here, as shown in FIG. 5, each protruding portion 43 extends slightly beyond the predetermined position P from the end of the rib 37 in the first direction X1 toward the second direction X2. In other words, each protruding portion 43 is not provided on the end side portion of the rib 37 in the second direction X2. The end of each protruding portion 43 in the second direction X2 is continuous with the end surface of the rib 37 (the end surface facing the circumferential direction of the rib body 39) via the curved surface 44 without any step.

(Manufacturing method of output member)
FIG. 6 is an explanatory diagram of a molding method of the output member. The output member 5 is formed by injection molding in which resin is injected through a gate 57 into a cavity formed by a mold 50. In this example, as shown by the dotted line in FIG. 6, as the mold 50, the outer mold 51 forming the gear 26, the annular surface 27, and the worm 28, and the inner circumference of the inner cylinder portion 35 and the outer cylinder portion 36 are formed. The output member 5 is injection molded using the surface 40, the plurality of ribs 37, and the inner mold 52 for forming a space between them. In injection molding, resin is injected from the first direction X1 through the gate 57 into the cavity partitioned by the inner mold 52 and the outer mold 51.

Here, the outer mold 51 has an outer first mold 53 located in the first direction X1 and an outer second mold located in the second direction X2 with a boundary between the annular surface 27 and the worm 28 in the X direction. The one divided into the mold 54 is used. Then, when the molded product is taken out from the mold 50, the outer first mold 53 is separated from the molded product in the first direction X1, and the outer second mold 54 is rotated around the axis L from the molded product. Separated in the second direction X2.

On the other hand, the inner mold 52 is divided into an inner first mold 55 located in the first direction X1 and an inner second mold 56 located in the second direction X2 with a predetermined position P in the X direction as a boundary. Use what is. Then, when the molded product is taken out from the mold 50, the inner first mold 55 is separated from the molded product in the first direction X1, and the inner second mold 56 is separated from the molded product in the second direction X2. ..

Here, the inner peripheral surface 40 of the outer tubular portion 36 has a first inner peripheral surface portion 40a having a taper extending in the first direction X1 from a predetermined position P in the central portion in the X direction and a second taper extending in the second direction X2. The inner peripheral surface portion 40b is provided. That is, the inner peripheral surface 40 of the outer tubular portion 36 is provided with a first inner peripheral surface portion 40a and a second inner peripheral surface portion 40b having a draft. Therefore, the inner first mold 55 is extracted from the molded product (output member 5) in the first direction X1, and the second mold 50 located in the second direction X2 is moved from the molded product (output member 5) to the second direction X2. It is easy to extract.

The parting line mark 41 provided in the central portion (predetermined position P) of the output member 5 in the X direction is a boundary (parting line) between the inner first mold 55 and the inner second mold 56 at the time of injection molding. It is a mark of. Further, the gate mark 42 provided by the rib 37 on the end surface in the first direction X1 is a mark to which the gate 57 is connected at the time of injection molding.

(Action effect)
According to this example, the resin output member 5 has an inner cylinder portion 35 through which the fixed shaft 4 penetrates, and an outer cylinder portion 35 having a gear 26 and a worm 28 on the outer peripheral surface and arranged on the outer peripheral side of the inner cylinder portion 35. The unit 36 is provided. Further, these are connected by a plurality of ribs 37. As a result, since a space is provided between the inner cylinder portion 35, the outer cylinder portion 36, and the plurality of ribs 37, it is possible to prevent the output member 5 from becoming thick. Therefore, it is possible to prevent or suppress deterioration of the dimensional accuracy of the output member 5 due to sink marks generated when the output member 5 is formed by injection molding.

Further, the outer tubular portion 36 includes a first inner peripheral surface portion 40a having a taper that extends toward the end of the first direction X1 on the inner peripheral surface 40. Therefore, it is easy to prevent the portion of the outer cylinder portion where the gear 26 is formed from becoming thick. Therefore, the gear 26 can be molded with high accuracy. Further, by providing the tapered first inner peripheral surface portion 40a, it is possible to prevent the portion where the gear 26 is formed from becoming thick without providing a step on the inner peripheral surface of the outer tubular portion. Therefore, as compared with the case where a step is provided on the inner peripheral surface of the outer tubular portion 36 to make the portion where the gear 26 is formed thinner, the inner peripheral surface of the outer tubular portion 36 is cracked due to a temperature change or the like. Can be prevented from occurring.

Further, in this example, each rib 37 projects from the end face to the end faces on both sides facing the circumferential direction in the circumferential direction, and extends from the end of the first direction X1 toward the second direction X2 until it exceeds a predetermined position P. The existing protruding portion 43 is provided. Therefore, as the gate 57, a gate 57 having a resin injection port corresponding to the combined area of the rib 37 and the protruding portion 43 when viewed from the X direction can be used. In other words, the resin can be injected into the mold 50 from the gate 57 having a wide resin injection port as compared with the case where the rib 37 does not have the protruding portion 43.

Further, the end of the protruding portion 43 provided on each rib 37 in the second direction X2 is continuous with the end surface of the rib 37 (the end surface of the rib body 39) via the curved surface 44 without a step. Therefore, the fluidity of the resin is improved as compared with the case where a step is formed between the end of the protruding portion 43 in the second direction X2 and the end face of the rib 37, which is caused by a temperature change or the like. Therefore, it is possible to prevent cracks from occurring at the end portion of the protruding portion 43 in the second direction X2.

Here, in this example, the inclination α1 of the first inner peripheral surface portion 40a with respect to the axis L is larger than the inclination α1 of the second inner peripheral surface portion 40b with respect to the axis L. Therefore, it is possible to further prevent the portion of the outer tubular portion 36 on which the gear 26 is formed from becoming thick. Further, when viewed from the X direction, the tooth tip 26a and the tooth bottom 26b of the gear 26 are located between the tooth tip 26a and the tooth bottom 26b of the worm 28. Therefore, while ensuring the thickness from the tooth bottom 26b of the gear 26 to the first inner peripheral surface portion 40a, the inclination α1 of the first inner peripheral surface portion 40a with respect to the axis L is the inclination of the second inner peripheral surface portion 40b with respect to the axis L. It is easy to make it larger than α1.

Further, in this example, the annular surface 27 of the output member 5 is located on the outer peripheral side of the tooth tip 26a of the gear 26. Since the annular surface 27 is provided, even when a member such as the gear 26 and the cover 6 on the outer peripheral side of the annular surface 27 comes into contact with the output member 5, this member contacts the annular surface 27 and reaches the gear 26. Contact is avoided.

(Other embodiments)
In the above example, six molding gates are connected to the mold 50 when the output member 5 is molded by injection molding, but the number of molding gates is not limited to this. When changing the number of molding gates, the number of ribs 37 connecting the inner cylinder portion 35 and the outer cylinder portion 36 can be changed to a number facing the number of molding gates.

The geared motor 1 may further include a plurality of gears in the transmission mechanism 29 that transmits the rotation of the output shaft 11 to the output member 5. Further, the motor body 2 of the geared motor 1 is not limited to the stepping motor, and may be, for example, a brushed motor.

1 ... Geared motor, 2 ... Motor body, 3 ... Frame, 4 ... Fixed shaft, 5 ... Output member, 6 ... Cover, 11 ... Output shaft, 12 ... Power supply unit, 15 ... First plate part, 16 ... Second plate Part, 17 ... Third plate part, 19 ... Hole, 20 ... Motor pinion, 22 ... Through hole, 25 ... Shaft hole, 26 ... Gear, 26a ... Gear tooth tip, 26b ... Gear tooth bottom, 26a ... Tooth tip , 26b ... tooth bottom, 27 ... annular surface, 28 ... worm, 28a ... worm tooth tip, 28b ... worm tooth bottom, 29 ... transmission mechanism, 30 ... support shaft, 31 ... composite gear, 32 ... large diameter gear, 33 ... Small diameter gear, 35 ... Inner cylinder part, 35a ... Protruding cylinder part, 36 ... Outer cylinder part, 37 ... Rib, 39 ... Rib body, 40 ... Inner peripheral surface of outer cylinder part, 40a ... First inner peripheral surface part , 40b ... 2nd inner peripheral surface portion, 41 ... Parting line mark, 42 ... Gate mark, 43 ... Protruding part, 44 ... Curved surface, 50 ... Mold, 51 ... Outer mold, 52 ... Inner mold, 53 ... Outer 1st mold, 54 ... Outer 2nd mold, 55 ... Inner 1st mold, 56 ... Inner 2nd mold, 57 ... Gate, L ... Axial line, X ... Axial direction, X1 ... 1st direction, X2 ... Second direction, α1 ... Inclination angle of the first inner peripheral surface portion with respect to the axis, α2 ... Inclination angle of the second inner peripheral surface portion with respect to the axis line

Claims (7)

A motor body with an output shaft and
Fixed shaft and
An output member rotatably supported by the fixed shaft and
It has a transmission mechanism that transmits the rotation of the output shaft.
The output member is arranged on the outer peripheral side of the inner cylinder portion having a shaft hole through which the fixed shaft penetrates, and one of the axial directions of the fixed shaft is the first direction and the other is the second direction. At that time, a gear is formed at the end portion in the first direction on the outer peripheral surface and a worm is formed in the second direction of the gear, and the axial direction is between the inner cylinder portion and the outer cylinder portion. And a plurality of ribs extending in the radial direction to connect the inner cylinder portion and the outer cylinder portion.
The transmission mechanism transmits the rotation of the output shaft to the gears.
The inner peripheral surface of the outer tubular portion includes a tapered first inner peripheral surface portion whose diameter dimension increases from a predetermined position of the central portion of the output member in the axial direction toward the end in the first direction, and the predetermined inner peripheral surface portion. A tapered second inner peripheral surface portion whose diameter dimension increases from the position toward the end in the second direction is provided .
The geared motor is characterized in that the plurality of ribs are provided with gate marks to which a molding gate is connected to the end surface in the first direction. The geared motor according to claim 1, wherein the output member is provided with a parting line mark of a molding die at the predetermined position. Each of the plurality of ribs projects from the end face in the circumferential direction to the end face facing the circumferential direction around the axis, and extends beyond the predetermined position from the end in the first direction toward the second direction. With parts,
The geared motor according to claim 1 or 2 , wherein the end of the protruding portion in the second direction is continuous with the end face without a step via a curved surface. The geared according to any one of claims 1 to 3 , wherein the inclination of the first inner peripheral surface portion with respect to the axis line is larger than the inclination of the second inner peripheral surface portion with respect to the axis line. motor. The geared motor according to claim 4 , wherein the tooth tip and the tooth bottom of the gear are located between the tooth tip and the tooth bottom of the worm when viewed from the axial direction. The output member includes an annular surface between the gear and the worm in the axial direction.
The geared motor according to any one of claims 1 to 5 , wherein the annular surface is located on the outer peripheral side of the tooth tip of the gear. A first plate portion fixed to the end surface of the motor body on the side where the output shaft protrudes, a second plate portion facing the first plate portion in the axial direction, and a first plate portion and a second plate. It has a frame including a third plate portion that connects the portions.
The geared motor according to any one of claims 1 to 6 , wherein the fixed shaft is bridged between the first plate portion and the second plate portion.

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