JP2007202388A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor in which a bearing stopper does not separate easily from a bearing holder. <P>SOLUTION: A lead screw motor comprises a bearing holder 12 where a pivot bearing 11 supporting a shaft 2 rotatably is fitted in a bearing containing hole 12a from the axial direction, and a bearing retaining plate (bearing stopper) 13 having a leaf spring piece 13a for urging the pivot bearing 11 in the axial direction and fixed to the bearing holder 12. The bearing holder 12 has a flange portion 12b including a pair of parallel guide edge side portions X<SB>1</SB>, X<SB>2</SB>and a pair of parallel guide edge side portions Y<SB>1</SB>, Y<SB>2</SB>intersecting perpendicularly each other. The bearing retaining plate 13 has insertion edge side portions W<SB>1</SB>, W<SB>2</SB>provided with slide grooves S<SB>1</SB>, S<SB>2</SB>for inserting the guide edge side portions X<SB>1</SB>, X<SB>2</SB>or the guide edge side portions Y<SB>1</SB>, Y<SB>2</SB>. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a small motor such as a lead screw motor, and more particularly to an improvement of a bearing holder and a bearing holder for pressing and urging a bearing held by the bearing holder in an axial direction.

Conventionally, in the lead screw motor disclosed in Japanese Patent Laid-Open No. 2003-324892, a bearing holder for holding a pivot bearing is formed of a sintered molded product, which is welded and fixed to a yoke of an outer stator, and the pivot bearing is axially moved. A structure in which a bearing retainer having a spring piece to be pressed and energized is attached to the end face of the bearing holder, and hook-shaped mounting portions formed on both sides of the bearing retainer are engaged and fixed in the recesses of the bearing holder. It has become.
JP 2003-324892 A

  This bearing retainer has a function as a bearing retaining plate. However, since the pivot bearing is always pressed and urged in the axial direction by the spring piece which is cut and raised, it is added to the lead screw which is the motor shaft at the time of starting. A sudden thrust force may cause the hook-shaped mounting portion of the bearing retainer to come off from the recess of the bearing holder. In addition, depending on the variation in molding between the spring piece and the hook-shaped mounting portion, the degree of crowning in the axial direction differs, so that the pressing force on the pivot bearing tends to vary. Furthermore, the spring piece sags due to repeated rapid thrust forces, and the pressing force against the pivot bearing tends to decline over time.

  Accordingly, in view of the above problems, a first object of the present invention is to provide a motor in which a bearing retainer is unlikely to come off from a bearing holder.

  The second object of the present invention is to provide a motor in which the pressing force of the bearing retainer against the bearing is less likely to vary.

  The third object of the present invention is to provide a motor in which the pressing force of the bearing retainer against the bearing does not easily deteriorate over time.

  In order to solve the above problems, the present invention provides a bearing holder in which a bearing for rotatably supporting a motor shaft is fitted into a bearing housing hole from the axial direction, and a bearing for elastically pressing and urging the bearing in the axial direction. In a motor having an elastic part and having a bearing retainer attached to the bearing holder, the bearing retainer is inserted into the bearing holder from the radial direction of the bearing holder and attached to the bearing holder and the bearing retainer. And a sliding attachment device.

  Because it is equipped with a sliding attachment device, when assembling the motor, the bearing holder can be inserted into the bearing holder from the radial direction of the bearing holder and then attached after the bearing is inserted into the bearing receiving hole of the bearing holder from the axial direction. For this reason, the thrust force applied to the elastic part of the bearing retainer is substantially orthogonal to the insertion / removal direction of the bearing retainer, and the thrust force does not affect the removal direction of the bearing retainer, so that the bearing retainer is not easily detached from the bearing holder. Further, since the bearing retainer is inserted and attached in the radial direction of the bearing holder, the axial positioning of the elastic portion with respect to the bearing holder is uniform, and the pressing force of the bearing retainer against the bearing is less likely to vary.

  As this sliding attachment device, for example, it is integrally formed at the end of the bearing holder, and a pair of parallel guide portions extending in the radial direction with the shaft center therebetween, and an elastic portion between the bearing retainer. And a pair of groove portions that can slide along the guide portions corresponding to the pair of guide portions. In this configuration, the axial length of the bearing holder can be shortened as compared with the case where the pair of guide portions are integrally formed with the bearing retainer and the pair of groove portions are integrally formed with the bearing holder.

  The elastic portion may be a spring piece that is cut and raised, but the spring constant is relatively large due to the relatively short beam length of the spring piece, and the variation in the elastic pressing force of the spring piece is large. Therefore, it is desirable that the elastic portion is a bent leaf spring piece which is bent at the edge of the bearing retainer and the free end presses the bearing. Since the length of the beam including the bent portion is increased, the spring constant can be reduced, and variations in the elastic pressing force can be suppressed.

  Further, it is desirable that the bearing retainer has an abutting stop portion that limits the elastic deformation amount of the elastic portion. Excessive deformation of the elastic deformation portion due to a sudden thrust force applied to the motor shaft at the time of startup or the like can be prevented by the stopper portion, and the elastic portion can be prevented from being sag. The stopper portion can be a protrusion that receives the bearing when the pressing portion that hits the bearing of the elastic portion is retracted due to elastic deformation.

  Here, it is desirable that the bearing holder and the bearing retainer be provided with a positioning stopper for limiting the insertion depth of the bearing retainer with respect to the bearing holder. The pressing portion that contacts the bearing of the elastic portion can be uniformly positioned. The positioning stopper may be a bent portion that is formed integrally with the edge portion of the bearing holder and the edge of the bearing holder and is in contact with the edge portion of the bearing holder. This bent part can be used as an operating part by a fingertip when the bearing holder is inserted into the bearing holder.

  Furthermore, it is desirable that the bearing holder and the bearing retainer include a latching means for preventing the bearing retainer from being pulled out of the bearing holder. As this latching means, a latching hole formed on the end surface of the bearing holder and a bearing holder are formed integrally with the bearing holder, and can be constituted by a latching hook that falls into the latching hole when the bearing holder is inserted into the bearing holder. . Conversely, a latching hole formed in the bearing holder and an end surface of the bearing holder may be formed integrally, and a latching projection that fits into the latching hole by inserting and moving the bearing holder into the bearing holder may be used.

  The bearing holder is preferably formed integrally with the resin portion on the outer stator side. Reduction of the number of parts and variation in positioning of the bearing can be suppressed.

  In the present invention, the bearing retainer does not come off from the bearing holder, and variation in the pressing force with respect to the bearing can be suppressed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
Example 1
1 is a perspective view showing a lead screw motor according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a method of attaching a bearing retaining plate to a bearing holder of the motor, and FIG. 3 is a lead screw motor. 4A is a plan view of the bearing retaining plate, FIG. 4B is a front view of the bearing retaining plate, and FIG. 4C is a left side view of the bearing retaining plate. 4D is a right side view of the bearing retaining plate, FIG. 4E is a bottom view of the bearing retaining plate, FIG. 4F is a rear view of the bearing retaining plate, and FIG. FIG. 5A is a perspective view of the bearing retaining plate viewed from the front side, and FIG. 5B is a perspective view of the bearing retaining plate viewed from the back side.

  As shown in FIGS. 1 to 3, the lead screw motor of this example includes a motor shaft 2 that protrudes from the motor body 1 to form a lead screw (not shown), and one end face of a motor case 6 of the motor body 1. And a bearing 4 which is attached to the frame 3 supported by the shaft 3 and rotatably supports the reduced diameter portion 2a of the shaft 2.

  The motor body 1 is a PM type (permanent magnet type) stepping motor. As shown in FIG. 3, an inner rotor comprising a shaft 2 and a magnet 5 into which the shaft 2 is fitted, and a yoke (core) 7 ( A phase outer yoke 7aa, A phase inner yoke 7ab, B phase outer yoke 7ba, B phase inner yoke 7bb) and a coil 9 (A phase coil) wound on an insulating resin portion 8 forming a bobbin portion in the yoke 7. 9a and an outer stator composed of a B-phase coil 9b).

  The shaft 2 is rotatably supported by the pivot bearing 11 via a steel ball 10 that fits in the inside hole 2b of the base end portion thereof and in the bearing hole 11a of the pivot bearing 11. The pivot bearing 11 is integrally formed with the insulating resin portion 8 and is fitted into the bearing receiving hole 12a of the bearing holder 12 protruding from the motor case 6, and is pressed in the axial direction by a bearing retaining plate (bearing retainer) 13. It is forced and kept from coming off.

As shown in FIG. 2, the bearing holder 12 has a substantially rectangular flange having a pair of guide edge portions X ₁ and X ₂ parallel to each other and a pair of guide edge portions Y ₁ and Y ₂ orthogonal to each other and parallel to each other. Part 12b. On the other hand, the bearing retaining plate 13 is formed by press-molding a single metal plate as shown in FIGS. 4 and 5, and has a substantially rectangular shape corresponding to the shape of the flange portion 12b. A leaf spring piece 13a for press-contacting the center portion of the end surface (back surface) 11b of the bearing 11 is cut and raised. In the bearing retaining plate 13, as shown in FIG. 4, a pair of edges sandwiching the central axis L of the leaf spring piece 13 a has a substantially U-shaped cross section formed by bending twice, and guide edge portions X ₁ , X ₂ or It is sandwiched edge portions W ₁ and W ₂ having slide grooves S ₁ and S ₂ for inserting into the guide edge portions Y ₁ and Y ₂ . The pair of guide edge portions X ₁ , X ₂ or the pair of guide edge portions Y ₁ , Y ₂ and the sandwiching edge portions W ₁ , W ₂ connect the bearing retaining plate 13 to the bearing holder 12 from the radial direction of the bearing holder 12. A retaining plate attaching device for inserting and attaching is configured.

Further, one edge other than the sandwiching edge parts W ₁ and W ₂ is bent and serves as a stopper part M that regulates the insertion depth of the bearing retaining plate 13. Furthermore, the withdrawal of this the corner near which the edge portion W ₂ sandwiched between the stopper portion M intersect one of the bearing retainer plate 13, the bearing retainer plate 13 which once inserted from the side of the flange portion 12b In order to prevent this, an elastic latching hook F that engages with any one of the latching holes H _{1 to} H ₄ of the bearing holder 12 is cut and raised.

In assembling the motor main body 1 of the lead screw motor, after inserting the pivot bearing 11 into the bearing receiving hole 12a of the bearing holder 12 from the axial direction, as shown in FIG. W ₁ and W ₂ are inserted into the guide edge portions X ₁ and X ₂ of the bearing holder 12 from the radial direction (side) of the bearing holder 12. In this insertion process, although the inclined leaf spring piece 13a hits the convex portion of the flange portion 12b, the tip of the leaf spring piece 13a gets over the convex portion at the rearmost end in the insertion direction, so that it does not catch on the end surface 11b of the pivot bearing 11. depression, the stopper portion M comes into contact with the guide edge portions Y _1, depressed the latching hook F is also engaging hole H ₁ consuming blind, plate spring piece 13a is positioned in a central portion of the end face 11b of the pivot bearing 11 . The bearing retaining plate 13 attached to the bearing holder 12 from the side is detached from the bearing holder 12 because the thrust reaction force of the leaf spring piece 13a does not affect the direction in which the bearing retaining plate 13 is pulled out. There is nothing. Moreover, engaging the hook F is because the stops consuming the latching holes H _1, by any chance, even force is applied in a direction missing the stop plate 13 exits the bearing, does not come off from the bearing holder 12. Further, since it is not necessary to provide the conventional hook-shaped mounting portion on the bearing retaining plate 13, variations in the pressing force with respect to the pivot bearing 11 can be suppressed.

Since the guide edge portions X ₁ and X ₂ and the guide edge portions Y ₁ and Y ₂ are formed on the flange portion 12b, the bearing retaining plate 13 can be inserted from a direction opposite to the direction shown in FIG. also it can be inserted from both the pair of guide edges portions Y _1, Y _2. At this time, the latch hook F is adapted to latch on the latch hole H _3, H _4, or H ₂ . Therefore, since the bearing retaining plate 13 can be inserted into the flange portion 12b from four directions in the radial direction, the assembling property of the bearing retaining plate 13 can be improved.

Further, the bearing holder 12 is integrally formed by extending an insulating resin portion 18 for insulating and separating the yoke 7 and the coil 9 of the stator. For this reason, it is possible to reduce the number of parts and suppress the positioning variation of the pivot bearing 11.
(Example 2)
6 is a perspective view showing a lead screw motor according to Embodiment 2 of the present invention, FIG. 7 is a perspective view showing a method of attaching a bearing retaining plate to a bearing holder of the motor, and FIG. 8A is FIG. FIG. 8B is a cross-sectional view showing a state cut along line BB ′ in FIG. 7, and FIG. 9A is a retainer for the bearing. 9B is a front view of the bearing retaining plate, FIG. 9C is a left side view of the bearing retaining plate, and FIG. 9D is a right side of the bearing retaining plate. 9 (E) is a bottom view of the bearing retaining plate, FIG. 9 (F) is a rear view of the bearing retaining plate, and FIG. 10 (A) is a perspective view of the bearing retaining plate viewed from the front side. FIG. 10 (B) is a perspective view of the bearing retaining plate as seen from the back side. 6 to 10, the same parts as those shown in FIGS. 1 to 5 are denoted by the same reference numerals.

  As shown in FIGS. 6 to 8, the lead screw motor of the present example includes a motor shaft 2 'projecting from a motor body 1' to form a lead screw (not shown), and a motor case 6 of the motor body 1 '. 'And a bearing 4 which is attached to a frame 3' supported on one end face of 'and rotatably supports the reduced diameter portion 2a of the shaft 2'.

  The motor body 1 'is a PM type (permanent magnet type) stepping motor. As shown in FIG. 8, a shaft 2', an inner rotor composed of a first magnet 5a and a second magnet 5b into which the shaft 2 'is inserted, and a motor case 6 ′, A yoke (core) 7 (A-phase outer yoke 7aa, A-phase inner yoke 7ab, B-phase outer yoke 7ba, B-phase inner yoke 7bb) fixed within the coil and an insulating resin portion 8 forming a bobbin portion in the yoke 7. And an outer stator composed of coils 9 (A-phase coil 9a and B-phase coil 9b) wound thereon. Between the A-phase coil 9a and the B-phase coil 9b, a terminal block 8a of the insulating resin portion 8 stands sideways from the notch 6a of the motor case 6 ', and the coil 9 is wound around the terminal block 8a. Four prismatic terminal pins P for tying the wire terminals are implanted.

  The shaft 2 'has a base end portion loosely fitted in the bearing hole 11a of the thrust bearing 11' and is rotatably supported. This thrust bearing 11 ′ is integrally formed with the insulating resin portion 8 and is fitted into the bearing receiving hole 12 a of the bearing holder 12 ′ protruding from the motor case 6 ′ from the axial direction, and a bearing retaining plate (bearing retainer) 13. ′ Is pressed and urged in the axial direction to prevent it from coming off.

Here, the diameter of the portion of the shaft 2 ′ where the lead screw is formed is D ₁ , the diameter of the portion where the magnets 5a and 5b are inserted in the motor body 1 ′ is D ₂ , and the bearing hole 11a of the thrust bearing 11 ′. When the diameter of the proximal end portion to fit the _{D 3,} the shaft 2 _'is a stepped shaft having a relationship _{D 1> D 2> D 3} . The magnets 5a and 5b are bonded and fixed to the shaft 2 'by an adhesive reservoir B formed in a concave shape at the same side end.

  As shown in FIG. 7, the bearing holder 12 ′ of this example has a pair of rail portions (protrusions) 12 b ′ and 12 c ′ with the shaft centers parallel to each other at the ends thereof. (Ridge portions) 12b 'and 12c' integrally have guide portions 12ba 'and 12ca' projecting in the shape of a bowl outward in the radial direction. An outer peripheral side of the end surface between the rail portions 12b ′ and 12c ′ is formed as a guide slope Z. The thrust bearing 11 'is formed with an annular groove V that divides the center surface and the outer peripheral annular surface. And the latching protrusion G is integrally formed on one rail part 12c '.

On the other hand, as shown in FIGS. 9 and 10, the bearing retaining plate 13 ′ is formed by press-molding a single metal plate, and is bent at the edge of the substrate portion 13a ′ covering the rail portions 12b ′ and 12c ′. Then, the curved free end U has a curved leaf spring piece 13b 'that presses the center surface of the end face of the thrust bearing 11', and the pair of edges sandwiching the left-right symmetrical axis L of the substrate portion 13a 'is 2 degrees. The cross section is substantially U-shaped by bending, and is sandwiched edge portions W ₁ and W ₂ having slide grooves S ₁ and S ₂ for insertion into the guide portions 12ba ′ and 12ca ′. At the center portion of the substrate portion 13a ', the stopper pieces Q ₁ and Q ₂ are cut and raised with the curved free end side U therebetween, and the stopper pieces Q ₁ and Q ₂ are excessive on the curved free end side U. The elastic deformation comes into contact with the end face of the thrust bearing 11 'when approaching the substrate portion 13a'. A guide device 12ba ′, 12ca ′ and sandwiching edge portions W ₁ , W ₂ is a mounting device for inserting and mounting the bearing retaining plate 13 ′ into the bearing holder 12 ′ from the radial direction of the bearing holder 12 ′. It is composed.

Further, the edges other than the folded edges of the sandwiched edge portions W ₁ and W ₂ and the bent plate spring piece 13b ′ of the board portion 13a ′ are bent to regulate the insertion depth of the bearing retaining plate 13 ′. It is a stopper part M. Further, a latching hole H ′ for fitting with the latching projection G is formed at one location of the bearing retaining plate 13 ′.

In the assembly of the motor body 1 'of the lead screw motor, after the thrust bearing 11' is fitted from the axial direction into the bearing receiving hole 12a of the bearing holder 12 ', as shown in FIG. pinching edge portion _W 1, _{W 2} the bearing holder 12 guide portion of 'the radial direction from the (side) bearing holder 12' 12ba ', 12ca' plugs into. In this insertion process, the curved free end U of the curved plate spring piece 13b 'rides over the guide slope Z on the end face of the bearing holder 12', strides over the annular groove V and elastically hits the center face, and is latched. Since the hole H ′ fits into the latching protrusion G, the curved free end U is positioned on the center plane.

  The operational effects of this example are the same as those of the first embodiment, but in addition to this, the following operational effects are achieved. Since the leaf spring for applying the elastic force to the thrust bearing 11 'is a curved leaf spring piece 13b', the beam length is longer than the cantilever length of the leaf spring piece 13a of the first embodiment. The constant can be reduced, and variations in the elastic pressing force can be suppressed.

Further, since the bearing retaining plate 13 ′ has the retaining pieces Q ₁ and Q ₂ , excessive deformation of the bent plate spring piece 13b ′ due to a sudden thrust force applied to the shaft 2 ′ at the time of startup or the like. When this occurs, the end face of the thrust bearing 11 'can be received in place of the curved plate spring piece 13b', and the sag of the curved plate spring piece 13b 'can be suppressed, and durability is increased.

In lead screw motor of the present embodiment, 'out of the lead screw D ₁ the diameter of the formed portion of _the motor body 1' shaft 2 in the magnet 5a, diameter D ₂ of the portion 5b is _inserted, the thrust 'When the diameter of the end portion that fits in the bearing hole 11a of the D _3, the shaft 2' bearing 11 portion, since a stepped shaft having a relationship _{D 1> D 2> D 3} , the magnet is inserted the diameter D ₂ of smaller in diameter than the diameter D ₁ of the forming portion of the lead screw, the outer diameter of the motor main body small can be realized narrow motor. Moreover, the diameter D ₃ is the magnet 5a of the end portion, since a smaller diameter than the diameter D ₂ of the insertion portion of 5b, it is possible to suppress the sliding loss in the bearing hole 11a. Furthermore, since the first magnet 5a and the second magnet 5b for the different phase are provided independently in the portion where the magnets 5a and 5b are inserted in the axial direction, the magnetic flux leakage between the different phases is suppressed. Therefore, a high-torque thin motor can be realized.

  The above attachment device is not limited to the lead screw motor of this example, but can be applied to a fan motor and other motors.

It is a perspective view which shows the lead screw motor which concerns on Example 1 of this invention. It is a perspective view which shows the attachment system of the bearing retaining plate with respect to the bearing holder of the motor. It is sectional drawing which shows the lead screw motor. (A) is a plan view of the bearing retaining plate, (B) is a front view of the bearing retaining plate, (C) is a left side surface of the bearing retaining plate, and (D) is a right side of the bearing retaining plate. (E) is a bottom view of the bearing retaining plate, and (F) is a rear view of the bearing retaining plate. (A) is the perspective view which looked at the bearing retaining plate from the front side, (B) is the perspective view which looked at the bearing retaining plate from the back side. It is a perspective view which shows the lead screw motor which concerns on Example 2 of this invention. It is a perspective view which shows the attachment system of the bearing retaining plate with respect to the bearing holder of the motor. (A) is sectional drawing which shows the state cut | disconnected by the AA 'line in FIG. 7, (B) is sectional drawing which shows the state cut | disconnected by the BB' line in FIG. (A) is a plan view of the bearing retaining plate, (B) is a front view of the bearing retaining plate, (C) is a left side view of the bearing retaining plate, and (D) is a view of the bearing retaining plate. A right side view, (E) is a bottom view of the bearing retaining plate, and (F) is a rear view of the bearing retaining plate. (A) is the perspective view which looked at the bearing retaining plate from the front side, (B) is the perspective view which looked at the bearing retaining plate from the back side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 '... Motor body 2, 2' ... Motor shaft 2a ... Tip diameter reducing part 2b ... Ball-carrying hole 3, 3 '... Frame 4 ... Bearing 5 ... Magnet 5a ... First magnet 5b ... Second magnet 6 , 6 '... motor case 6a ... notch 7 ... yoke (core)
7aa: A phase outer yoke 7ab ... A phase inner yoke 7ba ... B phase outer yoke 7bb ... B phase inner yoke 8 ... Insulating resin part 8a ... Terminal block 9 ... Coil 9a ... A phase coil 9b ... B phase coil 10 ... Steel ball DESCRIPTION OF SYMBOLS 11 ... Pivot bearing 11 '... Thrust bearing 11a ... Bearing hole 11b ... End surface (back surface)
12, 12 '... Bearing holder 12a ... Bearing housing hole 12b ... Flange portions 12b', 12c '... Rail portion (ridge portion)
12ba ', 12ca' ... guide portions 13, 13 '... bearing retaining plate (bearing retainer)
13a ... plate spring piece 13a '... substrate portion 13b' ... fold plate spring pieces B ... adhesive reservoir _D 1 to D 3 _... diameter F ... latching hook G ... locking projection _H 1 _{to H} 4 of the shaft, H ' ... engaging hole L ... symmetry axis M ... stopper portion P ... prismatic terminal pin Q _1, Q 2 _... Bumping pieces S _1, S 2 _... slide groove U ... curved free end side V ... annular groove X _1, X ₂ , Y ₁ , Y ₂ ... guide edge W ₁ , W ₂ ... sandwiched edge Z ... guide slope

Claims (12)

A bearing holder that rotatably supports the motor shaft is inserted into the bearing receiving hole from the axial direction, and an elastic portion for elastically pressing and urging the bearing in the axial direction. In a motor having a bearing retainer that is attached,
A motor comprising: the bearing holder and the bearing retainer provided with a sliding attachment device for inserting and attaching the bearing retainer to the bearing holder from a radial direction of the bearing holder. The motor according to claim 1, wherein the sliding attachment device is formed integrally with an end portion of the bearing holder, and a pair of parallel guide portions extending in a radial direction between the shaft centers. The elastic member is formed integrally with the bearing retainer, and has a pair of grooves that can slide along the guides corresponding to the pair of guides. motor. 3. The motor according to claim 1, wherein the elastic portion is a bent plate spring piece that is bent at an edge of the bearing retainer and a free end presses the bearing. 4. The motor according to claim 1, wherein the bearing retainer includes an abutment portion that limits an elastic deformation amount of the elastic portion. 5. 5. The motor according to claim 4, wherein the stopper portion is a protrusion that receives the bearing when a pressing portion of the elastic portion that contacts the bearing is retracted due to elastic deformation. 6. The motor according to any one of claims 1 to 5, wherein the bearing holder and the bearing retainer are provided with a positioning stopper for limiting a depth of insertion of the bearing retainer into the bearing holder. Characteristic motor. 7. The motor according to claim 6, wherein the positioning stopper is a bent portion that is formed integrally with an edge portion on an end surface side of the bearing holder and an edge of the bearing retainer and abuts on the edge portion. Characteristic motor. The motor according to any one of claims 1 to 7, wherein the bearing holder and the bearing retainer are provided with a latching means for preventing the bearing retainer from being pulled out of the bearing holder. A motor characterized by 9. The motor according to claim 8, wherein the latching means is formed integrally with a latching hole formed in an end surface of the bearing holder and the bearing retainer, and the bearing retainer is inserted into the bearing holder. A motor that is a latching hook that falls into the latching hole. 9. The motor according to claim 8, wherein the latching means is formed integrally with a latching hole formed in the bearing retainer and an end surface of the bearing holder, and the bearing retainer is inserted into the bearing holder. The motor is a latching protrusion that fits into the latching hole. The motor according to any one of claims 1 to 10, wherein the bearing holder is formed integrally with a resin portion on the outer stator side. 12. The lead screw motor according to claim 1, wherein a lead screw is formed on a portion of the motor shaft protruding from the motor body.

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