JP2021060069A - Friction mechanism and motor - Google Patents

Abstract

To suppress deformation of a rotating shaft when forming a friction mechanism.SOLUTION: A friction mechanism S includes a rotating shaft 50, a gear 60 having a shaft hole 60a through which the rotating shaft 50 is inserted, and a first washer 71 and a second washer 72 through which the rotating shaft 50 is inserted. The first washer 71 is sandwiched between a surface 61 on a first direction A1 side of the gear 60 and an enlarged diameter portion 80 provided on the rotating shaft 50, and the second washer 72 is sandwiched between a surface 62 on a second direction A2 side of the gear 60 and a deformed portion 50b in which a part of the rotating shaft 50 is crushed and plastically deformed to the first direction A1 side with respect to the second washer 72. The rotating shaft 50 is formed with a receiving surface 50f capable of receiving force for pressing the rotating shaft 50 toward the second direction A2, which is closer to the second direction A2 side than an end portion 50e on the first direction A1 side of the rotating shaft 50.SELECTED DRAWING: Figure 5

Description

The present invention relates to a friction mechanism and a motor.

Conventionally, a friction mechanism has been known in which the driving force of a driving source is transmitted to an output unit during normal operation, and when an excessive load is applied for some reason, the transmission of power is cut off to protect the driving object and the power transmission mechanism. ing. For example, Patent Document 1 discloses a geared motor 100 including a friction drive device 1.

The friction drive device 1 shown in Patent Document 1 is an annular metal plate having a rotating shaft 2, a tubular rotating member 4 having a hole 40 through which the rotating shaft 2 is inserted, and an annular metal plate into which the rotating shaft 2 is inserted. It has a member 3 and a plate-shaped urging member 5. The annular member 3 is sandwiched between the other surface 48 (more specifically, the one-side convex portion 47) of the tubular rotating member 4 and the large-diameter portion 21 provided on the rotating shaft 2, and is a plate. The shape urging member 5 has a one surface 46 (more specifically, the other side convex portion 49) of the tubular rotating member 4 and a part of the rotating shaft 2 on the other side L2 with respect to the plate-shaped rotating member 5. It is sandwiched between a deformed portion 23a that has been crushed and plastically deformed. Of the one surface 46 of the tubular rotating member 4, the peripheral portion of the shaft hole is recessed from the one-side convex portion 47 in contact with the plate-shaped urging member 5, and the inner peripheral portion 56 of the plate-shaped urging member 5 is deformed. It is pressed by the portion 23a and elastically deformed to the other side L2.

Japanese Unexamined Patent Publication No. 2014-58993

In the friction drive device 1, the plate-shaped urging member 5 is elastically deformed to the other end side L2 at the press-molded deformed portion 23a. The deformed plate-shaped urging member 5 urges the tubular rotating member 4 so as to press it against the annular member 3. As a result, the tubular rotating member 4 rotates integrally with the rotating shaft 2 due to the frictional resistance generated between the plate-shaped urging member 5 and the annular member 3. When an external force exceeding the frictional resistance is applied to the rotating shaft 2, the rotating shaft 2 slides (idles) with respect to the tubular rotating member 4, so that the external force is released.

When forming the friction drive device 1, for example, when press-molding the deformed portion 23a, a jig is used to press the end portion of the rotating shaft 2 with a strong force. At this time, the rotating shaft 2 may be bent depending on the length, shape, strength, and the like of the rotating shaft 2. This is because a pressing force is applied from one end of the rotating shaft 2 to the other end. Therefore, an object of the present invention is to suppress deformation of the rotating shaft when forming the friction mechanism.

The friction mechanism of the present invention comprises a rotating shaft, a gear having a shaft hole through which the rotating shaft is inserted, and a first washer and a second washer which are ring-shaped metal plates into which the rotating shaft is inserted. When one side of the rotating shaft in the axial direction is the first direction and the other side is the second direction, the first washer is provided on the surface of the gear on the first direction side and on the rotating shaft. The second washer is sandwiched between the enlarged diameter portion and the surface of the gear on the second direction side, and a part of the rotation shaft is on the first direction side with respect to the second washer. The rotating shaft is sandwiched between a deformed portion that has been crushed and plastically deformed, and the rotating shaft is located on the second direction side of the end portion of the rotating shaft on the first direction side. It is characterized in that a receiving surface capable of receiving a pressing force in two directions is formed.

According to this aspect, the rotating shaft presses the rotating shaft toward the second direction side at a position away from the end portion on the first direction side, that is, the end portion on the first direction side. A receiving surface that can receive force is formed. Therefore, it is possible to suppress the application of a pressing force from one end of the rotating shaft to the other end, that is, the friction mechanism can be configured so that the force is applied only for a short distance in the axial direction. Deformation of the rotating shaft during formation can be suppressed.

In the friction mechanism of the present invention, the rotating shaft may adopt a configuration in which a flange is formed at the end of the enlarged diameter portion on the second direction side, and the receiving surface is one surface of the flange. .. With such a configuration, a receiving surface can be formed at the end of the enlarged diameter portion on the second direction side, so that the configuration can be such that a force is applied only to a particularly short distance in the axial direction.

In the friction mechanism of the present invention, the rotating shaft may adopt a configuration in which a groove is formed in the enlarged diameter portion and the receiving surface is one surface of the groove. With such a configuration, the receiving surface can be easily formed only by forming a groove in the enlarged diameter portion. In addition, it is possible to suppress the occurrence of a portion where the outer diameter becomes large in the enlarged diameter portion.

In the friction mechanism of the present invention, the receiving surface receives a force of pressing the gear toward the second direction side via the jig when the gear is fixed to the rotating shaft by caulking with a jig. Is preferably configured so that This is because with such a configuration, the gear can be easily fixed to the rotating shaft by caulking with a jig.

The motor of the present invention preferably includes a rotor, a stator, and a friction mechanism including a rotating shaft that rotates as the rotor rotates with respect to the stator. This is because, with such a configuration, it is possible to obtain a motor in which deformation of the rotating shaft is suppressed.

In the motor of the present invention, a housing having a hole for accommodating the rotor, the stator, and the friction mechanism and projecting a part of the rotating shaft to the outside, and between the hole and the rotating shaft. It is preferable to include a resin member to be provided. This is because the resin member can reduce the frictional force between the hole and the rotating shaft and reduce the rotational load of the rotating shaft.

The friction mechanism of the present invention can suppress deformation of the rotating shaft when forming the friction mechanism.

It is a perspective view which shows the whole structure of the motor of Example 1. FIG. It is a side sectional view of the motor of Example 1. FIG. It is a top view which shows the state which removed the cover plate in the motor of Example 1. FIG. It is a perspective view of the friction mechanism of the motor of Example 1. FIG. It is a partial perspective view of the friction mechanism of the motor of Example 1. FIG. It is a perspective view of the rotation shaft of the friction mechanism of the motor of Example 1. FIG. FIG. 5 is a cross-sectional view for explaining a state in which a gear is fixed to a rotating shaft by caulking with a jig in the friction mechanism of the motor of the first embodiment. It is a perspective view of the rotation shaft of the friction mechanism of the motor of Example 2. FIG. FIG. 5 is a cross-sectional view for explaining a state in which a gear is fixed to a rotating shaft by caulking with a jig in the friction mechanism of the motor of the second embodiment. It is a perspective view of the rotation shaft of the friction mechanism of the motor of a reference example. It is sectional drawing for demonstrating the state of fixing a gear to a rotating shaft by caulking with a jig in the friction mechanism of the motor of a reference example.

Hereinafter, the geared motor 1 as a motor according to an embodiment of the present invention will be described with reference to the drawings.
[Example 1] (FIGS. 1 to 7)
First, the geared motor 1 of the first embodiment will be described. In the following description, "upper" and "lower" refer to directions parallel to the Z axis of the coordinate axis display drawn in FIGS. 1 to 3, with the Z1 side as "upper" and the Z2 side as "lower". To do. Then, "upper" corresponds to the first direction A1 in FIGS. 4 to 11, and "lower" corresponds to the second direction A2 in FIGS. 4 to 11. 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". Similarly, "left and right" means a direction parallel to the Y axis of the same coordinate axis display.

(Geared motor)
1 to 3 are explanatory views showing the overall configuration of the geared motor 1 to which the present invention is applied, and FIGS. 1, 2, and 3 are a perspective view of the geared motor 1 and a side cross section of the geared motor 1 in this order. FIG. 3 is a plan view showing a state in which the cover plate 12 is removed from the geared motor 1. As shown in FIG. 1, the geared motor 1 is provided on a bottomed tubular motor case 11, a cover plate 12 which is a plate-shaped member covered with an opening at the upper end of the motor case 11, and a front side of the motor case 11. It has a mounted terminal cover 15.

The cover plate 12 is provided with an opening for exposing the enlarged diameter portion 80 of the rotating shaft 50 of the friction mechanism S to the outside of the case, and a burring portion which is a circular flange portion in a plan view rising upward at the opening edge. 12b is formed. A part of the outer peripheral surface of the enlarged diameter portion 80 faces the inner peripheral surface of the burring portion 12b via the resin member 100. Further, the cover plate 12 is provided with a pair of attachment pieces 12a extending in the shape of a tongue piece from the left and right. The mounting piece 12a is a connecting portion when the geared motor 1 is assembled to a higher-level device or the like.

The terminal cover 15 is attached so as to cover an opening provided in a part of the peripheral surface of the motor case 11. The terminal cover 15 is composed of a base portion 151 mounted on the opening of the motor case 11 and a connector housing 152 provided so as to project forward from the base portion 151. Inside the connector housing 152, terminals 29 arranged in a row on the left and right are held as shown in FIGS. 2 and 3.

As shown in FIG. 2, the terminal 29, which is the power supply terminal of the geared motor 1, is a pin terminal whose both ends are bent up and down in the longitudinal direction thereof. The portion bent below the terminal 29 is arranged in the connector housing 152, and constitutes an external connection portion 292 to which the terminal of the male connector is connected. The portion bent upward of the terminal 29 constitutes a entwined portion 291 in which the coil wires of the stator coils 22 and 27 of the geared motor 1 are entwined.

The geared motor 1 of this embodiment is a two-phase stepping motor, and the stator 20 includes an A-phase stator coil 22 wound around an A-phase coil bobbin 21 and a B-phase stator coil 27 wound around a B-phase coil bobbin 26. ,have. A terminal holding portion 21a, which is a thick portion for holding the terminal 29, is formed on the front edge of the A-phase coil bobbin 21. The A-phase stator coil 22 has a claw pole-shaped salient pole, an upper yoke 23a and a lower yoke 23b. Similarly, the B-phase stator coil 27 also has an upper yoke 28a and a lower yoke 28b. The lower yoke 28b of the B-phase stator coil 27 is formed by cutting a part of the bottom surface of the motor case 11 into the motor case 11.

A rotor 30 is arranged in the rings of the stator coils 22 and 27 with a predetermined air gap. The rotor 30 is composed of a rotor magnet 32 which is a permanent magnet and a rotor support 31 which is a resin shaft body insert-molded into the rotor magnet 32. A shaft hole penetrating vertically is formed at the center of the rotor support 31 in the radial direction, and a rotor support shaft 39, which is a fixed shaft, is inserted into the shaft hole. The rotor support shaft 39 is fixed to the bottom surface of the motor case 11 and the cover plate 12. The lower surface of the rotor 30 is supported by a leaf spring 35 which is a leaf spring, and the rotor 30 is urged upward by the leaf spring 35.

A gear plate 13 which is a flat plate member is arranged on the upper surface of the stator 20. A pinion gear 31a, which is a gear portion, is formed at the upper end of the rotor support 31, and the pinion gear 31a projects upward from a through hole provided in the gear plate 13. A plurality of support shafts 49 are fixed to the upper surface of the gear plate 13 and the lower surface of the cover plate 12, and the first gear 41, the second gear 42, and the third gear 43, which will be described later, can be rotated on the support shaft 49. It is supported. Further, in the friction mechanism S, the base end portion 55 of the rotating shaft 50 is rotatably supported by a bearing 44c provided on the upper surface of the gear plate 13.

As shown in FIG. 3, the first gear 41, the second gear 42, and the third gear 43 constituting the reduction gear mechanism are each a composite in which spur gears having different pitch circle diameters are integrated in the axial direction. It is a gear. The rotation of the pinion gear 31a is decelerated via the first gear 41, the second gear 42, and the third gear 43, and is transmitted to the friction mechanism S. Specifically, the pinion gear 31a meshes with the large-diameter gear portion 41a of the first gear 41, and the small-diameter gear portion 41b of the first gear 41 meshes with the large-diameter gear portion 42a of the second gear 42. Similarly, the small-diameter gear portion 42b of the second gear 42 meshes with the large-diameter gear portion 43a of the third gear 43. The small-diameter gear portion 43b of the third gear 43 meshes with the gear 60 of the friction mechanism S.

The geared motor 1 includes a friction mechanism S, and transmits rotational power output from a motor unit including a rotor 30 and a stator 20 to a gear 60 of the friction mechanism S, while transmitting torque when an overload acts. It shuts off and allows the relative rotation of the motor unit and the gear 60. That is, the torque between the motor unit and the gear 60 is the frictional force acting between the first washer 71 and the surface 61 on the first direction A1 side (Z1 side) of the gear 60, and the second washer 72 and the gear 60. When it is less than or equal to the sum of the frictional force acting between the surface 62 on the A2 side (Z2 side) in the second direction, the motor unit and the gear 60 rotate integrally, so that the driving force of the motor unit is the first washer. It is transmitted to the gear 60 via the 71 and the second washer 72. The torque acting between the motor unit and the gear 60 exceeds the sum of the frictional force acting between the first washer 71 and the surface 61 and the frictional force acting between the second washer 72 and the surface 62. Then, the first washer 71 slides with respect to the surface 61 and the second washer 72 slides with respect to the surface 62, so that the torque transmission from the motor portion to the gear 60 is cut off. This makes it possible to allow the relative rotation of the gear 60 and the motor unit. Therefore, even when an excessive load is applied to the side of the gear 60, it is possible to prevent the gear from being damaged.

(Shaft Member Holding Structure) Hereinafter, a structure in which the geared motor 1 holds the friction mechanism S will be described with reference to FIG.

In the friction mechanism S, the base end portion 55 of the rotating shaft 50 is rotatably supported by a bearing 44c provided on the upper surface of the gear plate 13. Then, as shown in FIG. 2, the enlarged diameter portion 80 of the rotating shaft 50 is fitted to the burring portion 12b of the cover plate 12 via the resin member 100. Since the enlarged diameter portion 80 is fitted to the burring portion 12b via the resin member 100, there is an advantage that the slipperiness is improved and contact corrosion between dissimilar metals does not occur.

(Structure of friction mechanism)
Next, in addition to FIGS. 1 to 3, the configuration of the friction mechanism S in the geared motor 1 of the present embodiment will be described by using FIGS. 4 to 7 and FIGS. 10 and 11 showing the geared motor 1 of the reference example. explain. Here, FIG. 4 is a perspective view of the friction mechanism S of the present embodiment, FIG. 5 is a partial perspective view of the friction mechanism S of the present embodiment, and FIG. 6 is a rotation shaft of the friction mechanism S of the present embodiment. It is a perspective view of 50, and FIG. 7 is a cross-sectional view for explaining how the gear 60 is fixed to the rotating shaft 50 by caulking with a jig 200 in the friction mechanism S of this embodiment. Further, FIG. 10 is a perspective view of the rotation shaft 50 of the friction mechanism S in the geared motor 1 of the reference example, and FIG. 11 is a rotation of the friction mechanism S of the geared motor 1 of the reference example by caulking with a jig 200. It is sectional drawing for demonstrating the state of fixing a gear 60 to a shaft 50.

The friction mechanism S of this embodiment is an overload protection mechanism in which two power transmission members rotate integrally due to frictional resistance. The friction mechanism S has a torque limiter function that transmits the driving force of the drive source to the output unit during normal operation, and cuts off the transmission of power when an excessive load is applied for some reason to protect the drive target and the power transmission mechanism. have.

As shown in FIGS. 2, 5 and 7, the friction mechanism S of this embodiment is a ring-shaped metal plate through which the rotating shaft 50, the gear 60, and the rotating shaft 50 are inserted. It includes one washer 71 and a second washer 72. As shown in FIG. 2, the gear 60 has a shaft hole 60a through which the rotating shaft 50 is inserted. Here, the gear 60 is a rotating member made of resin, and the first washer 71 and the second washer 72 are ring-shaped metal plates.

Here, as shown in FIGS. 4 and 5, when one side of the rotating shaft 50 in the axial direction A is the first direction A1 and the other side is the second direction A2, the first washer 71 is a gear. It is sandwiched between the surface 61 on the A1 side of the first direction of 60 and the enlarged diameter portion 80 provided on the rotating shaft 50. Further, the second washer 72 is a deformed portion in which the surface 62 on the second direction A2 side of the gear 60 and a part of the rotating shaft 50 are crushed toward the first direction A1 side with respect to the second washer 72 and plastically deformed. It is sandwiched between 50b and 50b.

Further, as shown in FIGS. 5 to 7, the rotating shaft 50 is located at a position on the second direction A2 side in the axial direction A, in other words, is a second end portion 50e on the first direction A1 side of the rotating shaft 50. A flange 50c as a receiving portion is provided at a position on the A2 side in the two directions so that a receiving surface 50f capable of receiving a force for pressing the rotating shaft 50 toward the A2 side in the second direction is formed. As described above, the rotation shaft 50 of the friction mechanism S of the present embodiment is located at a position distant from the end portion 50e on the first direction A1 side and the second direction A2 side, that is, the end portion 50e on the first direction A1 side. A receiving surface 50f capable of receiving a force for pressing the rotating shaft 50 toward the second direction A2 is formed therein. Therefore, the friction mechanism S of the present embodiment can suppress the application of a pressing force from one end 50e of the rotating shaft 50 to the other end 50d, that is, a short distance D1 in the axial direction A. The configuration is such that only force is applied, and the deformation of the rotating shaft 50 when forming the friction mechanism S can be suppressed.

Here, in the jig 200 shown in FIG. 7, the contact portion 202 is brought into contact with the root portion 55a of the base end portion 55, which is the forming portion of the deformed portion 50b, and the contact portion 203 is brought into contact with the receiving surface 50f. The configuration is such that a force can be applied in the direction in which the contact portion 202 and the contact portion 203 are brought closer to each other. As shown in FIG. 7, when the gear 60 is fixed to the rotating shaft 50 by caulking with the jig 200 in the friction mechanism S of the geared motor 1 of the present embodiment, the rotating shaft 50 is in the axial direction. In A, the force is applied only to the short distance D1 from the deformed portion 50b to the receiving surface 50f. Therefore, the rotating shaft 50 is not easily deformed.

On the other hand, in the jig 200 shown in FIG. 11, the contact portion 202 is brought into contact with the root portion 55a of the base end portion 55, the contact portion 201 is brought into contact with the end portion 50e, and the contact portion 202 and the contact portion 201 are brought into contact with each other. It is configured so that force can be applied in the direction of approaching. The friction mechanism S of the geared motor 1 of the reference example shown in FIGS. 10 and 11 does not have a flange 50c as a receiving portion as shown in FIGS. 10 and 11. Then, as shown in FIG. 11, when the gear 60 is fixed to the rotating shaft 50 by caulking with the jig 200 in the friction mechanism S of the geared motor 1 of the reference example, the rotating shaft 50 has an axis line. In the direction A, a force is applied to a long distance D0 from the deformed portion 50b to the end portion 50e. Therefore, the rotating shaft 50 is easily deformed.

As described above, depending on the shape of the friction mechanism S, when the gear 60 is fixed to the rotating shaft 50 by caulking with the jig 200, a force is applied to the second direction A2 side via the jig 200. The rotating shaft 50 may be easily deformed by making it possible. However, the friction mechanism S of the present embodiment has a short distance D1 in which a force is applied in the axial direction A, so that the rotation shaft 50 can be easily crimped by using the jig 200 while suppressing the deformation of the rotating shaft 50. The gear 60 can be fixed to the rotating shaft 50.

Further, as described above, in the friction mechanism S of the present embodiment, the rotating shaft 50 has a flange 50c formed at the end of the enlarged diameter portion 80 on the second direction A2 side, and the receiving surface 50f is the flange 50c. It is composed on one side. With such a configuration, the friction mechanism S of the present embodiment can form the receiving surface 50f at the end of the enlarged diameter portion 80 on the second direction A2 side, so that the force can be applied only to a particularly short distance in the axial direction A. It is possible to make the configuration so that it does not take.

Here, as shown in FIG. 7, the deformed portion 50b is crushed toward the A1 side in the first direction with respect to the second washer 72 by press working with the jig 200. At this time, since the peripheral portion of the shaft hole 60a of the gear 60 is recessed, the inner peripheral edge of the second washer 72 is elastically deformed so as to be pushed by the deformed portion 50b and the inner peripheral edge is warped toward the first direction A1. To do. As a result, the second washer 72 acts as a disc spring and urges the gear 60 toward the A1 side in the first direction. Then, the urged gear 60 is pressed against the first washer 71. Since the first washer 71 has higher rigidity than the second washer 72, it does not deform even when it receives the urging force of the second washer 72. As a result, the gear 60 rotates integrally with the rotating shaft 50 due to the frictional resistance generated between the first washer 71 and the second washer 72. When an external force exceeding the frictional resistance is applied to the friction mechanism S, the first washer 71 and the second washer 72 and the gear 60 slip, and the rotating shaft 50 or the gear 60 idles to parry the external force. ..

Here, in the friction mechanism S of the present embodiment, a metal plate having a higher rigidity than the second washer 72 is used for the first washer 71. This prevents the first washer 71 from being distorted by the force applied when the deformed portion 50b is press-molded.

The first washer 71 and the second washer 72 of this embodiment have the same thickness. The rigidity of the first washer 71 is increased by subjecting the first washer 71 to a salt bath soft nitriding treatment. By applying a surface treatment to the first washer 71 to increase its rigidity, distortion of the first washer 71 is prevented without increasing the thickness of the first washer 71, that is, without hindering the miniaturization of the friction mechanism S. It is possible.

Since the friction mechanism S uses the second washer 72 as a disc spring, the second washer 72 needs to be deformed and assembled. In the friction mechanism S of the present embodiment, the first washer 71 uses a washer having a higher rigidity than the second washer 72 to strongly prevent the first washer 71 from being deformed, thereby making the second washer 72 stronger. It is possible to increase the threshold torque by elastically deforming it more greatly. The "threshold torque" here means a torque in which one of the rotating shaft 50 or the gear 60 is fixed and the other starts idling when an external force is applied to the other.

As described above, according to the friction mechanism S of the present embodiment, the deformation of the first washer 71 is prevented, so that the variation in the threshold torque at which the rotating shaft 50 and the gear 60 start idling is suppressed. In addition, it becomes easy to set the same threshold torque to a large value.

Next, the geared motor 1 of this embodiment will be described from the viewpoint of the motor. The geared motor 1 of this embodiment includes a rotor 30, a stator 20, and a friction mechanism S including a rotating shaft 50 that rotates with respect to the stator 20 as the rotor 30 rotates. With such a configuration, the geared motor 1 of this embodiment is a motor in which deformation of the rotating shaft 50 is suppressed.

Further, in the geared motor 1 of the present embodiment, the housing 5 which accommodates the rotor 30, the stator 20, and the friction mechanism S and has a burring portion 12b as a hole for projecting a part of the rotating shaft 50 to the outside, It has. Then, as shown in FIGS. 1 to 3, a resin member 100 is provided between the burring portion 12b and the rotating shaft 50. By providing the resin member 100 between the burring portion 12b and the rotating shaft 50, the resin member 100 can reduce the frictional force between the burring portion 12b and the rotating shaft 50, and can reduce the rotational load of the rotating shaft 50.

[Example 2] (FIGS. 8 and 9)
FIG. 8 is a perspective view of the rotation shaft 50 of the friction mechanism S in the geared motor 1 of the second embodiment, and FIG. 11 is a rotation of the friction mechanism S of the geared motor 1 of the second embodiment by caulking with a jig 200. It is sectional drawing for demonstrating the state of fixing a gear 60 to a shaft 50. The components common to those in the first embodiment are indicated by the same reference numerals, and detailed description thereof will be omitted. Further, the geared motor 1 of the present embodiment has the same configuration as the geared motor 1 of the first embodiment except for the configuration of the rotating shaft 50 in the friction mechanism S.

As shown in FIG. 6, the rotating shaft 50 in the friction mechanism S of the geared motor 1 of the first embodiment includes a flange 50c having a receiving surface 50f. On the other hand, as shown in FIG. 8, the rotating shaft 50 in the friction mechanism S of the geared motor 1 of the present embodiment is provided with a groove 50 g having a receiving surface 50f in the enlarged diameter portion 80 instead of being provided with the flange 50c. ..

Here, the jig 200 shown in FIG. 9 is provided with a convex portion 204 that can move in a direction intersecting the axial direction A (Z-axis direction), and has a configuration in which the convex portion 204 can be inserted into the groove 50 g. It has become. Then, the contact portion 202 is brought into contact with the root portion 55a of the base end portion 55, and the convex portion 204 is inserted into the groove 50g to bring the contact portion 202 into contact with the receiving surface 50f, so that the contact portion 202 and the convex portion 204 are brought closer to each other. It is a configuration that can be added. As shown in FIG. 9, when the gear 60 is fixed to the rotating shaft 50 by caulking with the jig 200 in the friction mechanism S of the geared motor 1 of the present embodiment, the rotating shaft 50 is in the axial direction. In A, the force is applied only to the short distance D2 from the deformed portion 50b to the receiving surface 50f. Therefore, the rotating shaft 50 is not easily deformed.

As described above, in the friction mechanism S of the present embodiment, the rotating shaft 50 has a groove 50g formed in the enlarged diameter portion 80, and the receiving surface 50f is formed on one surface of the groove 50g. Since the friction mechanism S of the present embodiment has such a configuration, the receiving surface 50f can be easily formed only by forming the groove 50g in the enlarged diameter portion 80. Further, the rotating shaft 50 can be easily formed by suppressing the occurrence of a portion having a large outer diameter in the enlarged diameter portion 80.

The present invention is not limited to the above-described embodiment, and can be realized with various configurations within a range not deviating from the gist thereof. For example, the technical features in the examples corresponding to the technical features in each form described in the column of the outline of the invention may be used to solve some or all of the above-mentioned problems, or one of the above-mentioned effects. It is possible to replace or combine as appropriate to achieve part or all.

1: Geared motor, 11: Motor case, 12: Cover plate, 12b: Burling part (opening), 20: Stator, 30: Rotor, S: Friction mechanism, 50: Rotating shaft, 50b deformed part :, 50c: Flange , 50d: end, 50e: end, 50f: receiving surface, 50g: groove, 55: base end, 60: gear, 60a: shaft hole, 61: surface, 62: surface, 71: first washer, 72 : 2nd washer, 80: Enlarged diameter part, 100: Resin member, 200: Jig

Claims (6)

Rotation axis and
A gear having a shaft hole through which the rotating shaft is inserted,
The first washer and the second washer, which are ring-shaped metal plates through which the rotating shaft is inserted,
With
When one side of the rotation axis in the axial direction is the first direction and the other side is the second direction,
The first washer is sandwiched between the surface of the gear on the first direction side and the enlarged diameter portion provided on the rotating shaft.
The second washer is composed of a surface of the gear on the second direction side and a deformed portion in which a part of the rotating shaft is crushed toward the first direction side with respect to the second washer and plastically deformed. Sandwiched between
The rotating shaft is formed with a receiving surface capable of receiving a force for pressing the rotating shaft toward the second direction on the second direction side of the end of the rotating shaft on the first direction side. A friction mechanism characterized by being In the friction mechanism according to claim 1,
The rotating shaft has a flange formed at the end of the enlarged diameter portion on the second direction side.
A friction mechanism characterized in that the receiving surface is one surface of the flange. In the friction mechanism according to claim 1,
The rotating shaft has a groove formed in the enlarged diameter portion.
A friction mechanism characterized in that the receiving surface is one surface of the groove. In the friction mechanism according to any one of claims 1 to 3,
The receiving surface is configured to be able to receive a force pressing the gear in the second direction via the jig when the gear is fixed to the rotating shaft by caulking with a jig. Friction mechanism featuring. With the rotor
With the stator
The friction mechanism according to any one of claims 1 to 4, further comprising the rotating shaft that rotates as the rotor rotates with respect to the stator.
A motor characterized by being equipped with. In the motor according to claim 5,
A housing having a hole for accommodating the rotor, the stator, and the friction mechanism and projecting a part of the rotating shaft to the outside.
A resin member provided between the hole and the rotating shaft,
A motor characterized by being equipped with.

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