JP5836039B2 - Motor and motor manufacturing method - Google Patents

Description

  The present invention relates to a motor and a method for manufacturing the motor.

  Among various types of motors, a type of motor in which the rotor includes a rotating shaft is provided with a bearing that supports the rotating shaft. Further, since it is necessary to limit the movable range of the rotor to the bearing side when the rotor rotates to prevent rattling and contact between the rotor and the bearing, for example, the bearing and the motor axis line around the rotating shaft. There has been proposed a structure in which a cylindrical portion opposing in a direction is provided and a washer is provided at an end portion on the side where the bearing is located with respect to the cylindrical portion (see Patent Document 1).

JP 2008-22619 A

  However, when the cylindrical portion and the washer are provided as in the configuration described in Patent Document 1, there are problems that the number of parts increases, the number of assembly steps increases, and the cost of the motor increases. If it is necessary to adjust the gap between the bearing and washer by adjusting the dimension from the end of the rotor opposite to the bearing, that is, the end of the rotor opposite to the output side to the washer, It is necessary to prepare multiple types of washers with different dimensions, change the washer attached to the rotating shaft, and adjust the dimension from the end opposite to the bearing of the rotor to the washer. There is a problem that the number of parts increases, the number of assembly steps increases, and the cost of the motor increases.

  In view of the above problems, the object of the present invention is to limit the range of movement of the rotor to the bearing side without mounting a washer at a position facing the bearing on the rotating shaft, and to determine the direction of the motor axis between the rotor and the bearing. It is an object of the present invention to provide a motor and a method for manufacturing the motor that can adjust the size of the gap.

In order to solve the above-described problems, the present invention provides a motor having a rotor having a rotating shaft and a bearing that supports the rotating shaft, and the rotor is arranged around the rotating shaft in the motor axial direction. And a cylindrical portion made of resin that defines a movable range of the rotor toward the bearing side, and the cylindrical portion includes a flange portion that extends radially outward at an end portion of the bearing side , and the flange portion Is a plastic deformation part formed in the heat melting part of the end of the cylindrical part on the bearing side, and the plastic deformation part is opposed to the bearing through a gap .

  In the present invention, a cylindrical portion is provided around the rotating shaft in a position facing the bearing in the motor axial direction, and the cylindrical portion includes a flange portion that extends radially outward at an end portion on the bearing side. When displaced to the bearing side, the flange portion of the cylindrical portion comes into contact with the bearing. For this reason, even if a washer is not provided in the position which opposes a bearing in a rotating shaft, the movable range to the bearing side of a rotor can be restrict | limited.

In the present invention, the flange portion is ing by plastically deforming the bearing side end of the tubular portion. According to this configuration, when the cylindrical portion is plastically deformed and the collar portion is provided, the degree to which the cylindrical portion is shortened changes depending on the degree of plastic deformation. Therefore, if the degree of plastic deformation is adjusted, the bearing side of the rotary shaft Can adjust the dimension from the end on the opposite side to the end on the bearing side of the cylindrical portion. Therefore, the clearance dimension between the cylindrical portion of the rotor and the bearing can be adjusted.

Furthermore, in the present invention, the tubular portion is made of resin, the flange portion is ing by thermally melting the bearing side end of the tubular portion. According to such a configuration, the cylindrical portion can be easily plastically deformed to provide the flange portion.

  In the present invention, it is possible to adopt a configuration in which the cylindrical portion is a sleeve attached to the rotating shaft. According to such a configuration, regardless of the type of motor, the movable range to the bearing side of the rotor can be limited using the flange portion of the cylindrical portion.

  In the present invention, the rotor includes a core fixed to the rotating shaft, an insulator covering the core, and a coil wound from above the insulator, and the cylindrical portion is formed integrally with the insulator. It is preferable that According to such a configuration, there is an advantage that it is not necessary to provide a separate cylindrical portion.

According to another aspect of the present invention, there is provided a motor manufacturing method including a rotor having a rotating shaft and a bearing that supports the rotating shaft, and a resin-made cylindrical portion is provided at a position to be opposed to the bearing of the rotating shaft. The rotating shaft is obtained by performing a plastic deformation process in which the end of the cylindrical portion on the bearing side is thermally melted and plastically deformed into a shape that expands in the radial direction to shorten the axial dimension of the cylindrical portion. Adjusting the dimension from the end opposite to the bearing side to the end of the cylindrical portion on the bearing side, and facing the bearing-side end of the cylindrical portion and the bearing through a gap It is characterized by making it.

  In the present invention, it is preferable that an end portion on the bearing side of the cylindrical portion is formed with a stepped portion or a tapered portion at an inner edge before the plastic deformation step. According to this configuration, the end portion of the cylindrical portion can be easily plastically deformed.

In the present invention, the cylindrical portion made of resin is provided around the rotation shaft in a position facing the bearing in the motor axial direction, and the cylindrical portion has a flange portion that extends radially outward at the end portion on the bearing side. When the rotor is displaced to the bearing side, the flange portion of the cylindrical portion comes into contact with the bearing. For this reason, the movable range to the bearing side of the rotor can be limited without attaching a washer to the rotating shaft. Also, heat the tube part
Easily plastically deformed by fusion to be able to provide the flange portion, in which, since the cylindrical portion is changed the degree of shortened by the extent of plastic deformation, by adjusting the degree of plastic deformation, the rotor and the bearing The dimension of the gap in the motor axis direction can be adjusted.

It is sectional drawing of the motor which concerns on Embodiment 1 of this invention. It is sectional drawing of the motor which concerns on Embodiment 2 of this invention. In the motor to which this invention is applied, it is sectional drawing which shows the structure of the edge part of the other side of the motor axial direction of the cylinder part before performing a plastic deformation process.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, in the motor axis direction L, the side where the base end side of the rotating shaft is located is referred to as one side L1 (counter output side / downward side), and the side where the tip end side of the rotating shaft is located is the other side L2 ( Output side / upper side).

[Embodiment 1]
(Overall configuration of motor with brush)
FIG. 1 is a cross-sectional view of a motor according to Embodiment 1 of the present invention, and FIGS. 1A and 1B are a cross-sectional view of the entire motor and an enlarged cross-sectional view of the vicinity of a cylindrical portion. In the motor 1 with a brush shown in FIG. 1A, the output end side of the rotating shaft 51 protrudes from the upper end surface 31 of the cup-shaped motor case 3. Inside the motor case 3, a core 52 composed of a laminated core formed by laminating a plurality of magnetic plates is fixed by press-fitting at a substantially central portion of the rotating shaft 51 in the motor axial direction L. A plurality of salient poles 59 are formed at equiangular intervals on the outer peripheral side of the core 52, and a coil 53 is wound around each of the plurality of salient poles 59 to constitute an armature 50. In this embodiment, since the core 52 is coated with insulation, the coil 53 is directly wound around the core 52 without attaching an insulator. In this way, the armature 50 and the rotating shaft 51 constitute the rotor 5 that can rotate integrally.

  In the motor case 3, a permanent magnet 6 magnetized with a plurality of poles is fixed to the inner peripheral surface of the cylindrical body portion 32, and the permanent magnet 6 faces the outer peripheral surface of the core 52 through a predetermined gap. ing. A brush holder 4 made of polyamide or the like is attached to an opening end located on one side L1 of the motor case 3 in the motor axial direction L. In this embodiment, when viewed from the motor axial direction L, the motor case 3 has an oval shape composed of an arc portion and a straight portion connecting the arc portions, and the brush holder 4 corresponds to the shape. Also, when viewed from the motor axial direction L, it has an oval shape composed of an arc portion and a straight portion connecting the arc portions.

  The rotating shaft 51 is rotatably supported by a radial bearing 91 whose other side L2 in the motor axial direction L is held by the upper end surface 31 of the motor case 3, and a portion of the rotating shaft 51 that is supported by the radial bearing 91. As shown in FIG. 1B, a cylindrical tube portion 80 made of a sleeve is press-fitted and fixed between the portion where the core 52 is fixed.

  As shown in FIGS. 1A and 1B, the end portion 81 on one side L <b> 1 of the cylindrical portion 80 in the motor axial direction L is in contact with the core 52. On the other hand, the end portion 82 on the other side L2 of the cylinder portion 80 in the motor axial direction L is a flange portion 83 that extends radially outward. The flange portion 83 is a motor axis line with respect to the radial bearing 91. Opposing one side L1 in the direction L through a predetermined gap.

  Here, the flange 83 is formed by plastically deforming the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side, as will be described later. More specifically, the cylindrical portion 80 is a sleeve made of a thermoplastic resin such as polyacetal resin, and the flange portion 83 is formed by thermally melting the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side. Yes.

  One side L <b> 1 of the rotating shaft 51 in the motor axial direction L is supported in the thrust direction by the bottom surface of the bottomed cylindrical portion 42 formed in the brush holder 4, and is held radially inside the bottomed cylindrical portion 42. A bearing 96 is rotatably supported.

  A commutator 7 that rotates integrally with the rotating shaft 51 is formed in a portion of the rotating shaft 51 that is positioned on one side L1 in the motor axial direction L from the core 52, and a washer 75 and a varistor are positioned adjacent to the commutator 7. 77 is arranged. The commutator 7 includes a resin sleeve 71 fixed to the rotary shaft 51 and segments 72 held at equal angular intervals on the outer peripheral surface of the sleeve 71, and penetrates the sleeve 71 in the motor axial direction. The rotation shaft 51 is passed through the hole 710. In the commutator 7, three protrusions 711 protrude from the end of the sleeve 71 on the other side L <b> 2 in the motor axial direction toward the other side L <b> 2 in the motor axial direction. The three protrusions 711 are formed at equiangular intervals in the circumferential direction, are positioned between the coils 53 adjacent in the circumferential direction, and prevent the commutator 7 from spinning around the rotation shaft 51. Further, a washer 79 is attached to the rotary shaft 51 at a position adjacent to the commutator 7 on one side L1 in the motor axial direction L.

  The distal end sides of the two brushes 9 are in elastic contact with the outer peripheral surface of the commutator 7, and the proximal end sides of these brushes 9 are held by the brush holder 4. Here, the tip of the brush 9 is divided into three in a comb shape. The brush 9 is made of a metal plate, and the tip side that contacts the outer peripheral surface of the commutator 7 is formed of a clad material with a noble metal as a sliding portion.

  The brush holder 4 includes a flange portion 41 that overlaps the open end of the motor case 3, a thick portion 43 to which the terminal 99 is fixed inside the flange portion 41, and a space in which the brush 9 can be disposed around the commutator 7. A concave portion 44 having a substantially rectangular planar shape is formed, and a bottomed cylindrical portion 42 that holds a radial bearing 96 is formed at the central position of the concave portion 44.

  With respect to the brush holder 4 configured in this way, the base end side of the brush 9 is fixed in the slit of the brush holder 4, and the base end side of the brush 9 and the terminal 99 are directly inside the slit, Alternatively, they are electrically connected via a wiring member such as a substrate or a lead wire.

(Method for manufacturing motor 1)
In manufacturing the motor 1 of this embodiment, first, the core 52 is press-fitted and fixed to the rotating shaft 51. Next, when the rotating shaft 51 is press-fitted into the hole 710 of the sleeve 71 of the commutator 7, the three protrusions 711 of the commutator 7 enter between the adjacent coils 53 in the circumferential direction.

  Next, a cylindrical tube portion 80 made of a sleeve is attached to the other side L2 of the rotating shaft 51 in the motor axial direction L, and an end portion 81 on one side L1 of the cylindrical portion 80 in the motor axial direction L is brought into contact with the core 52. Make contact. As a result, the cylindrical portion 80 is provided at a position to be opposed to the radial bearing 91 on one side L1 in the motor axial direction L. At this time, the entire cylindrical portion 80 has the same outer diameter dimension in the length direction, and the flange portion 83 is not formed.

  Next, after winding the coil 53 around the core 52, the end of the coil 53 is connected to the end of the segment 72. Also, the varistor 77 is soldered. Next, the commutator 7 is polished so that the outer peripheral surface of the segment 72 is aligned with the outer peripheral surface of the sleeve 71.

  Next, from the end of the rotating shaft 51 opposite to the radial bearing 91 (from the end L1 on the one side L1 of the rotating shaft 51 in the motor axial direction L) to the end 82 (cylinder) of the cylindrical portion 80 on the radial bearing 91 side. The dimension LL up to the end portion 82) of the other side L2 in the motor axial direction L of the portion 80 is adjusted.

  More specifically, in the plastic deformation step, the end portion 82 of the cylindrical portion 80 is plastically deformed, and the end portion 82 on the radial bearing 91 side of the cylindrical portion 80 is used as the flange portion 83, and the radial bearing 91 side of the rotary shaft 51 is To the end 82 on the radial bearing 91 side of the cylindrical portion 80 (the other side L2 of the cylindrical portion 80 in the motor axial direction L) from the opposite end portion (the end portion on the one side L1 of the rotating shaft 51 in the motor axial direction L). The dimension LL up to the end portion 82) is adjusted to the design value. In this embodiment, the cylindrical portion 80 is a sleeve made of a thermoplastic resin such as polyacetal resin, and therefore the end portion 82 on the radial bearing 91 side of the cylindrical portion 80 is thermally melted to form the flange portion 83. As a result, the dimension of the cylindrical portion 80 in the motor axial direction L is shortened, so that the dimension LL from the end portion of the rotating shaft 51 on the opposite side to the radial bearing 91 side to the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side. Can be adjusted. Therefore, the clearance dimension between the radial bearing 91 and the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side can be adjusted.

  Therefore, after the motor 1 is assembled, when the cylinder portion 80 is displaced to the other side L2 of the rotor 5 in the motor axial direction L, it comes into contact with the radial bearing 91 side to move the rotor 5 toward the radial bearing 91 side. Define the range. Therefore, rattling in the motor axial direction L of the rotor 5 can be suppressed to a small level. Further, the end portion 82 (the flange portion 83) of the cylindrical portion 80 on the radial bearing 91 side is located on the other side L <b> 2 in the motor axial direction L from the coil 53. Therefore, even if the rotor 5 is displaced to the other side L2 in the motor axial direction L, the coil 53 does not come into contact with the radial bearing 91, so that the coil 53 can be prevented from being damaged.

(Main effects of this form)
As described above, the motor 1 of the present embodiment includes the cylindrical portion 80 that opposes the radial bearing 91 in the motor axial direction L around the rotation shaft 51, and the cylindrical portion 80 is an end portion on the radial bearing 91 side. 82 is provided with a flange 83 extending radially outward. Therefore, when the rotor 5 is displaced toward the radial bearing 91, the flange portion 83 of the cylindrical portion 80 comes into contact with the radial bearing 91. For this reason, the movable range of the rotor 5 toward the radial bearing 91 can be limited without attaching a washer at a position facing the radial bearing 91 on the rotating shaft 51.

  Further, when the cylindrical portion 80 is plastically deformed to provide the flange portion 83, the extent to which the cylindrical portion 80 is shortened changes depending on the degree of plastic deformation. Therefore, if the degree of plastic deformation is adjusted, the motor axial direction L of the rotor 5 , That is, the end 82 on the radial bearing 91 side of the cylindrical portion 80 from the end opposite to the radial bearing 91 side of the rotating shaft 51 (the end on one side L1 of the rotating shaft 51 in the motor axial direction L). The dimension LL up to (the end portion 82 on the other side L2 of the cylindrical portion 80 in the motor axial direction L) can be adjusted. Therefore, the clearance dimension between the radial bearing 91 and the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side can be adjusted.

  Furthermore, in this embodiment, the cylindrical portion 80 is a sleeve attached to the rotating shaft 51, so that the flange portion 83 of the cylindrical portion 80 allows the rotor 5 to be connected to the rotor 5 regardless of whether an insulator is used for the rotor 5. The movable range toward the radial bearing 91 can be limited.

  Further, in this embodiment, since the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side is thermally melted to form the flange portion 83, the flange portion 83 is small. Therefore, when a load is applied to the rotating shaft 51 via a worm gear or the like, the rotating shaft 51 is pulled to the other side L2 in the motor axial direction L so that the flange portion 83 and the radial bearing 91 slide. Even in this case, the sliding area is small. Therefore, it is possible to avoid a situation where a loud sliding sound is generated or a situation where a large sliding loss occurs.

[Embodiment 2]
FIG. 2 is a cross-sectional view of the motor 1 according to Embodiment 2 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 2, the motor 1 of the present embodiment is also a brushed motor 1 as in the first embodiment. In the rotor 5, a core 52 is press-fitted and fixed to a rotating shaft 51. Here, the rotor 5 has a resin insulator 8 that covers the core 52, and a coil 53 is wound around the core 52 from above the insulator 8. The insulator 8 includes, for example, a first member that covers the core 52 from one side L1 in the motor axial direction L and a second member that covers the core 52 from the other side L2 in the motor axial direction L.

  The rotating shaft 51 is rotatably supported by a radial bearing 91 whose other side L2 in the motor axial direction L is held by the upper end surface 31 of the motor case 3, and is supported by the radial bearing 91 on the rotating shaft 51. The cylindrical portion 80 is press-fitted and fixed between the portion where the core 52 is fixed and the portion where the core 52 is fixed.

  In the present embodiment, the cylindrical portion 80 is a portion protruding from the insulator 8 to the other side L2 in the motor axial direction L. For this reason, the end portion 81 on one side L <b> 1 of the cylinder portion 80 in the motor axial direction L is in contact with the core 52. On the other hand, the end portion 82 on the other side L2 of the cylinder portion 80 in the motor axial direction L is a flange portion 83 that extends radially outward. The flange portion 83 is a motor axis line with respect to the radial bearing 91. Opposing one side L1 in the direction L through a predetermined gap.

  Also in this embodiment, the flange 83 is formed by plastically deforming the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side, as in the first embodiment. More specifically, the cylindrical portion 80 is a sleeve made of a thermoplastic resin such as polyimide resin or polyacetal resin, and the flange portion 83 is obtained by thermally melting the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side. Is formed.

  In this embodiment, the insulator 8 includes a cylindrical portion 88 that protrudes toward the one side L1 in the motor axial direction L, and the cylindrical portion 88 is notched at equal angular intervals in the circumferential direction. Therefore, the protrusion 711 of the commutator 7 is located in the notch of the cylindrical portion 88 of the insulator 8 between the coils 53 adjacent in the circumferential direction, and prevents the commutator 7 from spinning around the rotating shaft 51. Yes.

  In manufacturing the motor 1 of this embodiment, first, the core 52 is press-fitted and fixed to the rotating shaft 51, and then the insulator 8 is attached to the core 52. At that time, the rotary shaft 51 is press-fitted into the cylindrical portion 80. As a result, the cylindrical portion 80 is provided at a position to be opposed to the radial bearing 91 on one side L1 in the motor axial direction L. At this time, the entire cylindrical portion 80 has the same outer diameter dimension in the length direction, and the flange portion 83 is not formed.

  Next, when the rotating shaft 51 is press-fitted into the hole 710 of the sleeve 71 of the commutator 7, the three protrusions 711 of the commutator 7 enter between the adjacent coils 53 in the circumferential direction.

  Next, after winding the coil 53 around the core 52, the end of the coil 53 is connected to the end of the segment 72. Also, the varistor 77 is soldered. Next, the commutator 7 is polished so that the outer peripheral surface of the segment 72 is aligned with the outer peripheral surface of the segment 72.

  Next, from the end of the rotating shaft 51 opposite to the radial bearing 91 (from the end L1 on the one side L1 of the rotating shaft 51 in the motor axial direction L) to the end 82 (cylinder) of the cylindrical portion 80 on the radial bearing 91 side. The dimension LL of the portion 80 up to the end portion 82 on the other side L2 in the motor axial direction L is adjusted to a set value.

  More specifically, in the plastic deformation step, the end portion 82 of the cylindrical portion 80 is plastically deformed, and the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side is used as a flange portion 83. In this embodiment, since the cylindrical portion 80 is made of a thermoplastic resin, the end portion 82 on the radial bearing 91 side of the cylindrical portion 80 is thermally melted to form the flange portion 83. As a result, the dimension of the cylindrical portion 80 in the motor axial direction L is shortened, so that the dimension LL from the end portion of the rotating shaft 51 on the opposite side to the radial bearing 91 side to the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side. Can be adjusted. Therefore, the clearance dimension between the radial bearing 91 and the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side can be adjusted.

  Therefore, after the motor 1 is assembled, when the cylinder portion 80 is displaced to the other side L2 of the rotor 5 in the motor axial direction L, it comes into contact with the radial bearing 91 side to move the rotor 5 toward the radial bearing 91 side. Define the range. Therefore, rattling in the motor axial direction L of the rotor 5 can be suppressed to a small level. Further, the end portion 82 (the flange portion 83) of the cylindrical portion 80 on the radial bearing 91 side is located on the other side L <b> 2 in the motor axial direction L from the coil 53. Therefore, even if the rotor 5 is displaced to the other side L2 in the motor axial direction L, the coil 53 does not come into contact with the radial bearing 91, so that the coil 53 can be prevented from being damaged.

  As described above, the motor 1 of the present embodiment also includes the cylindrical portion 80 that opposes the radial bearing 91 in the motor axial direction L around the rotation shaft 51 as in the first embodiment. A flange 83 is provided that extends radially outward at the end 82 on the radial bearing 91 side. Therefore, when the rotor 5 is displaced toward the radial bearing 91, the flange portion 83 of the cylindrical portion 80 comes into contact with the radial bearing 91. For this reason, the movable range of the rotor 5 toward the radial bearing 91 can be limited without attaching a washer at a position facing the radial bearing 91 on the rotating shaft 51.

  Further, when the cylindrical portion 80 is plastically deformed to provide the flange portion 83, the degree to which the cylindrical portion 80 is shortened changes depending on the degree of plastic deformation. Therefore, if the degree of plastic deformation is adjusted, the radial bearing 91 of the rotating shaft 51 is changed. The end 82 on the radial bearing 91 side of the cylindrical portion 80 (the other side of the cylindrical portion 80 in the motor axial direction L) from the end opposite to the side (the end on one side L1 of the rotating shaft 51 in the motor axial direction L) The dimension LL up to the end 82) of L2 can be adjusted. Therefore, the clearance dimension between the radial bearing 91 and the end portion 82 of the cylindrical portion 80 on the radial bearing 91 side can be adjusted.

  Furthermore, in this embodiment, the cylindrical portion 80 is a part of the insulator 8 attached to the core 52, and therefore there is an advantage that it is not necessary to attach a sleeve made of a separate member to the rotating shaft 51.

[Configuration Example of the Cylinder 80]
FIG. 3 is a cross-sectional view showing the configuration of the end portion 82 on the other side L2 of the cylinder portion 80 in the motor axial direction L before performing the plastic deformation step in the motor 1 to which the present invention is applied. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  As for the cylindrical portion 80 used in the first embodiment, it is possible to use one that extends with a certain thickness before the plastic deformation step, as shown in FIGS. 3 (a) and 3 (b). Thus, before performing the plastic deformation step, the plastic deformation step can be easily performed by using a thin end portion 82 on the other side L2 in the motor axial direction L.

  For example, a stepped portion 82a is formed at the inner edge of the end portion 82 on the other side L2 in the motor axial direction L of the cylindrical portion 80 shown in FIG. For this reason, if it melts so that the step part 82a whole may lose | disappear in a plastic deformation process, the collar part 83 shown in FIG. 1 and FIG. 2 can be formed easily.

  Further, a tapered portion 82b is formed on the inner edge of the end portion 82 on the other side L2 in the motor axial direction L of the cylindrical portion 80 shown in FIG. For this reason, if it heat-melts so that the whole taper part 82b may lose | disappear in a plastic deformation process, the collar part 83 shown in FIG. 1 and FIG. 2 can be formed easily.

[Other embodiments]
In the above embodiment, the present invention is applied to the motor 1 with a brush. However, the present invention is applied to a case where the movable range of the rotor 5 is limited in a motor of a type in which a permanent magnet is provided on the rotating shaft 51 such as a stepping motor. May be applied.

1. ・ Motor 5 with brush ・ ・ Rotor 8 ・ ・ Insulator 52 ・ ・ Core (laminated core)
80. ・ Tube part 83.

Claims (5)

In a motor having a rotor having a rotating shaft and a bearing supporting the rotating shaft,
The rotor includes a resin cylindrical portion that defines a movable range toward the bearing side of the rotor so as to face the bearing in the motor axial direction around the rotating shaft,
The cylindrical portion includes a flange portion that extends radially outward at an end portion on the bearing side , and the flange portion is a plastic deformation portion formed in a heat melting portion of the end portion on the bearing side of the cylindrical portion. The motor is characterized in that the plastic deformation portion faces the bearing through a gap . The motor according to claim 1, wherein the cylindrical portion is a sleeve attached to the rotating shaft . The rotor includes a core fixed to the rotating shaft, an insulator covering the core, and a coil wound from above the insulator,
The tubular portion, the motor according to claim 1 or 2, characterized in that it is formed on the insulator integrally. In a method of manufacturing a motor having a rotor having a rotation shaft and a bearing that supports the rotation shaft,
A resin cylindrical portion is provided at a position to be opposed to the bearing of the rotating shaft,
The bearing of the rotating shaft is formed by performing a plastic deformation process in which the end of the cylindrical portion on the bearing side is thermally melted and plastically deformed into a shape extending in the radial direction, and the axial dimension of the cylindrical portion is shortened. Adjusting the dimension from the end opposite to the side to the end of the cylindrical portion on the bearing side so that the end of the cylindrical portion on the bearing side and the bearing are opposed to each other through a gap. A manufacturing method of a motor characterized by the above. The motor manufacturing method according to claim 4, wherein a stepped portion or a tapered portion is formed on an inner edge of the end portion on the bearing side of the cylindrical portion before performing the plastic deformation step.

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