JP4960152B2 - motor - Google Patents

Description

  The present invention relates to a motor. More specifically, the present invention relates to a bearing structure for the shaft end of the rotating shaft.

  Stepping motors used in digital cameras, digital video cameras, and the like generally include a rotor having a permanent magnet on the outer periphery of a rotating shaft and a stator disposed on the outer periphery of the rotor. It is rotatably supported.

In such a motor, as a structure for mounting a bearing, for example, a configuration is disclosed in which a cylindrical portion is formed on a base plate on an end surface on the counter-output side of a stator and a bearing is press-fitted into the cylindrical portion (Patent Document 1). reference).
JP-A-10-98865

  However, in the configuration described in Patent Document 1, it is difficult to ensure a suitable clearance between the cylindrical portion and the bearing. Therefore, when the bearing is press-fitted into the cylindrical portion, the cylindrical portion is deformed, and the positional accuracy of the bearing is increased. There is a problem that it cannot be secured. Moreover, the situation that a bearing is hold | maintained in the state inclined with respect to the cylinder part may also occur.

  In view of the above problems, an object of the present invention is to provide a motor capable of arranging a bearing with high accuracy.

In order to solve the above problems, in the present invention, a rotor having a rotating shaft having a permanent magnet, a stator disposed on the outer peripheral side of the rotor, a bearing that supports the rotating shaft, and the bearing are held. In the motor having a bearing holder, the bearing includes a bearing portion that supports the rotating shaft and a flange portion that protrudes in a radial direction from the bearing portion, and the bearing holder is a bearing into which the bearing portion is inserted. A support hole and a flange support portion that overlaps the flange portion on one side in the motor axial direction, and the flange portion is pressed and fixed to the bearing holder or the stator toward the flange support portion. the support member is held in the bearing holder is provided with a positioning portion for defining the angular position about the motor axis of the bearing contact around the motor axis relative to said bearing, said bearing ho The flange part support part is composed of a bottom part of a recess recessed in the motor axial direction, and the bearing part is inserted into the bearing support hole in a state where the flange part enters the inside of the recess. The bearing is hold | maintained at the said bearing holder, The internal peripheral surface of the said recessed part is the said positioning part, It is characterized by the above-mentioned.

In the present invention, the bearing is provided with a flange portion that protrudes in the radial direction from the bearing portion, and a structure in which the flange portion is pressed and fixed toward the flange support portion of the bearing holder by the support member held by the bearing holder or the stator. Since it is adopted, the bearing is always held in the bearing holder in an appropriate posture. Further, since it is not necessary to press-fit the bearing portion of the bearing into the bearing support hole of the bearing holder, the bearing support hole of the bearing holder is not deformed when the bearing is disposed. Therefore, the bearing can be arranged with high accuracy. Also, the bearing holder is formed with a positioning portion that abuts the bearing around the motor axis to define the angular position of the bearing around the motor axis, so that the bearing is oriented in a predetermined direction around the motor axis. While being able to fix to a state, this state can be maintained reliably. Furthermore, in the bearing holder, the flange support portion is composed of a bottom portion of a recess recessed in the motor axis direction, and the bearing flange is inserted into the recess of the bearing holder, so that the size of the motor in the motor axis direction is shortened. can do. In addition, if a structure in which the flange portion of the bearing is fitted in the recess of the bearing holder is adopted, the inner peripheral surface of the recess and the outer peripheral surface of the flange portion interfere with each other, so that the flange portion does not rattle in the circumferential direction. The position restriction in the circumferential direction can be reliably performed. Here, it is preferable that the concave portion includes a substantially rectangular concave portion, and the flange portion has a substantially rectangular shape in which a contour shape when the bearing is viewed from the motor axial direction can be engaged with the concave portion. .

  In this invention, it is preferable that the said support member is provided with the spring property which presses and fixes the said collar part elastically toward the said collar part support part. If comprised in this way, a collar part can be reliably pressed and fixed toward the collar part support part of a bearing holder with a support member.

  In this invention, it is preferable that the said supporting member is hold | maintained at the end surface of the other side in the motor axial direction of the said bearing holder. If comprised in this way, since it is not necessary to form a complicated engagement mechanism, such as a hook, in a bearing holder or a stator, the dimension in the motor axial direction of a motor can be shortened.

  In the present invention, the bearing is formed with a through hole through which the shaft end of the rotating shaft is inserted in the motor axial direction, and the shaft end of the rotating shaft is connected to the support member in the motor axial direction. It is preferable that a spring portion that is biased to the side is formed. If comprised in this way, the function which energizes a rotating shaft and the function which fixes a bearing to a bearing holder can be provided to one support member, and reduction of a number of parts can be aimed at.

  In the present invention, a plurality of protrusions protruding along the motor axis may be formed on one of the surface of the support member that overlaps the flange and the surface of the flange that overlaps the support member. preferable. If comprised in this way, a collar part can be reliably pressed and fixed toward the collar part support part of a bearing holder compared with the structure which surface-joins a supporting member and a bearing.

  In the present invention, it is preferable that a plurality of protrusions projecting along the motor axis are formed on one of the surface of the bearing holder that overlaps the flange and the surface of the flange that overlaps the bearing holder. . If comprised in this way, a collar part can be reliably pressed and fixed to the collar part support part of a bearing holder compared with the structure which surface-joins the collar part support part of a bearing holder, and the collar part of a bearing.

  In this invention, it is preferable that the said protrusion is formed in two places which pinch | interpose a motor axis line, for example. If comprised in this way, the collar part of a bearing can be pressed and fixed to the collar part support part of a bearing holder, without the center axis line of the bearing part of a bearing inclining with respect to a motor axis line.

In the present invention, when a plurality of protrusions projecting in the motor axis direction are formed on one of the surface overlapping the flange portion in the support member and the surface overlapping the support member in the flange portion, the bearing portion is The bearing support hole is formed in a circular shape having an inner diameter dimension substantially the same as the outer diameter dimension of the bearing portion, and the protrusions are formed at two positions sandwiching the motor axis. In addition, it is also possible to adopt a configuration that is formed at a position overlapping the contour of the bearing portion and the opening edge of the bearing support hole when viewed from the motor axial direction.

In the present invention, the bearing portion is preferably formed in a cylindrical shape having an outer diameter dimension substantially the same as the inner diameter dimension of the stator. If comprised in this way, the center axis line of a bearing part and the center axis line of a stator can be piled up by inserting a bearing part in the center hole of a stator.

  In this invention, it is preferable that the said collar part support part consists of the bottom part of the recessed part dented in the motor axial direction in the said bearing holder, for example. If comprised in this way, since it becomes the structure where the collar part of the bearing entered in the recessed part of the bearing holder, the dimension in the motor axial direction of a motor can be shortened. In addition, if a structure in which the flange portion of the bearing is fitted in the concave portion of the bearing holder is adopted, the inner peripheral surface of the concave portion and the outer peripheral surface of the flange portion interfere with each other, so that the flange portion does not rattle in the circumferential direction. The position restriction in the circumferential direction can be reliably performed.

  In the present invention, the bearing is provided with a flange portion that protrudes in the radial direction from the bearing portion, and a structure in which the flange portion is pressed and fixed toward the flange support portion of the bearing holder by the support member held by the bearing holder or the stator. Since it is adopted, the bearing is always held in the bearing holder in an appropriate posture. Further, since it is not necessary to press-fit the flange portion of the bearing into the bearing support hole of the bearing holder, the bearing support hole of the bearing holder is not deformed when the bearing is disposed. Therefore, the bearing can be arranged with high accuracy.

  A motor to which the present invention is applied will be described below with reference to the drawings. In the following explanation, in the motor axis direction, the side from which the rotating shaft protrudes will be referred to as the output side (front end side / front side), and the opposite side will be described as the non-output side (base end side / back side). In the present embodiment, an example in which the present invention is applied to a motor of a type in which the rotating shaft is biased to one side (output side / tip side) in the motor axial direction by a biasing member will be described.

(General configuration of motor)
1A to 1D are respectively a plan view of a motor to which the present invention is applied, a right side view in which the upper half is cut away, and an output side in a motor axial direction (a side from which a rotating shaft projects). 2) a front view and a rear view.

  As shown in FIGS. 1A to 1D, the motor 1 of this embodiment is a small stepping motor, and includes a rotor 3 and a stator 4 disposed on the outer peripheral side of the rotor 3.

  The rotor 3 includes a rotating shaft 31 extending in the direction of the motor axis L, and a cylindrical permanent magnet 32 fixed to the outer periphery of the rotating shaft 31, and the rotating shaft 31 is partially a stator 4. It protrudes from the end surface on the tip side. N poles and S poles are alternately magnetized in the circumferential direction on the outer peripheral surface of the permanent magnet 32. In this embodiment, the permanent magnet is a sintered magnet formed by compressing and molding a magnet powder, and is made of a rare earth magnet such as a neodymium magnet.

  The stator 4 has side surfaces facing each other as a flat surface, while the other side surfaces are formed in an arc shape. The stator 4 includes an annular coil wound around an insulator and a pair of stator cores 41 and 42 provided on both sides of the coil in the axial direction, and an outer peripheral side of the stator sets 41 and 42 in the axial direction. The case 49 also functions as a back yoke. The stator sets 41 and 42 are stacked in the direction of the motor axis L, and the stator core constituting the stator sets 41 and 42 includes a large number of pole teeth along the inner peripheral surface of the coil. The pole teeth formed on each of the pair of stator cores are alternately arranged in the circumferential direction of the coil and are opposed to the permanent magnet 32 with a gap. In the case 49, an opening 49a is formed in a side surface formed in an arc shape, and terminal portions 47 and 48 to which a winding terminal of the coil 46 is connected protrude from the opening 49a.

  In the stator 4, a bearing holder 6 is fixed to a base end side (counter output side) end surface of the rotating shaft 31 among end surfaces facing each other in the direction of the motor axis L by a method such as spot welding. The shaft end on the base end side is supported by a first radial bearing 11 fixed to the bearing holder 6.

  Although details will be described later with reference to FIGS. 2 to 5, an urging member 7 (support member) is held on the opposite side of the bearing holder 6 from the side on which the stator 4 is located. The member 7 fixes the first radial bearing 11 to the bearing holder 6 and urges the rotary shaft 31 toward the distal end side.

  Although details will be described later with reference to FIGS. 6 and 7, a plate 19 is fixed to the end face on the output side (the end face on which the rotating shaft 31 protrudes) in the stator 4. A through hole 19a for projecting the rotating shaft 31 is formed. The second radial bearing 12 is held in the through hole 19a, and the rotating shaft 31 is also rotatably supported by the second radial bearing 12.

  Here, the rotating shaft 31 is biased to the output side by the biasing member 7, and it is necessary to regulate the position in the direction of the motor axis L. Therefore, as will be described later in detail with reference to FIG. 7, a washer set 5 in which the washers can be in sliding contact with each other between the permanent magnet 32 and the second radial bearing 12 is inserted into the rotary shaft 31. Thus, a structure is adopted in which the position of the rotor 3 is regulated in the direction of the motor axis L via the washer set 5 and the second radial bearing 12.

(Configuration of the bearing holder 6, the first radial bearing 11, and the biasing member 7)
FIGS. 2A and 2B are a rear view and a cross-sectional view taken along line AA ′ of the bearing holder 6 used in the motor to which the present invention is applied, as viewed from the non-output side in the direction of the motor axis L. FIGS. 3A to 3C are a rear view, a bottom view, and a BB view of the first radial bearing 11 used in the motor to which the present invention is applied as viewed from the opposite output side in the direction of the motor axis L. It is a cross-sectional view. 4A and 4B are a rear view and a right side view, respectively, of an urging member used in a motor to which the present invention is applied as viewed from the non-output side in the motor axis L direction. FIG. 5 is an explanatory view showing the structure when the bearing holder, the first radial bearing, and the urging member used in the motor to which the present invention is applied are combined with each other. b1) is a sectional view and a rear view showing the bearing holder 6 holding the first radial bearing 11, and FIGS. 5 (a2) and 5 (b2) are the counter output of the stator 4 by the bearing holder 6 respectively. A sectional view and a rear view showing a state of being fixed to the side end face, and FIGS. 5 (a3) and 5 (b3), respectively, urging the shaft end on the counter-output side of the rotating shaft 31 by the urging member 7. It is sectional drawing and back view which show. In FIGS. 5 (b1) and 5 (b2), the first radial bearing is hatched to the right.

As shown in FIG. 2, the bearing holder 6 is a substantially rectangular sintered part, and a through hole 60 including a through hole is formed at a substantially central position through which the motor axis L passes. A shallow concave portion 61 is formed in a region around the through hole 60 on the counter-output side end face of the bearing holder 6. The through-hole 60 has a shape in which a rectangular portion protrudes from the circular portion toward the outer peripheral side, and the circular portion constitutes a bearing support hole 60a that holds a first radial bearing 11 described later, and the rectangular portion is A positioning hole 60b for positioning the bearing holder 6 and the stator 4 is formed. The recess 61 includes a substantially rectangular first recess (depression portion) 61a extending in the left-right direction (the direction indicated by the arrow x) from the region where the bearing support hole 60a is formed, and the upper end of the first recess 61a. It is formed by a substantially rectangular second recess 61b that protrudes upward from the center portion in the longitudinal direction (y direction) of the bearing holder 6.

  In the bearing holder 6 configured as described above, the bottom 61c of the recess 61 is used as a flange support portion that supports the flange 11b of the first radial bearing 11 described later, and the inner peripheral wall 61d of the recess 61 is the first The radial bearing 11 is used as a positioning portion that defines an angular position around the motor axis L.

  As shown in FIG. 3, the first radial bearing 11 includes a cylindrical bearing portion 11a having a circular shaft hole 11e, and a flange portion 11b projecting in a radial direction from a non-output side end portion of the bearing portion 11a. It is a resin molded product provided with. The bearing portion 11a has a cylindrical shape having an outer diameter that is substantially the same as the inner diameter of the stator shown in FIG.

  In the first radial bearing 11, a large-diameter circular recess 11d is formed concentrically with the shaft hole 11e on the end face on the counter-output side, and the shaft hole 11e and the circular recess 11d are integrated. A through hole penetrating the first radial bearing 11 in the direction of the motor axis L is formed. The flange portion 11b has a substantially rectangular shape extending in the left-right direction (the direction indicated by the arrow x), and a part of the outer peripheral portion of the bearing portion 11a projects in an arc shape at the center portion of the upper end of the flange portion 11b. Yes. In the flange portion 11b, small cylindrical protrusions 11c are formed in the same size at two positions sandwiching the shaft hole 11e and the circular recess 11d on the left and right sides on the non-output side end face, and the two protrusions 11c are connected to the motor axis L Is formed at a point-symmetrical position with respect to. In the first radial bearing 11 configured as described above, the two projecting portions 11c are provided with a flat plate portion 71 of the urging member 7 when the urging member 7 described later is held on the side opposite to the side where the stator 4 is located. Is biased toward the output side.

  As shown in FIG. 4, the urging member 7 is made of a metal plate such as SUS301 processed into a predetermined shape, and a flat plate portion 71 formed in an oval shape and a substantially central portion of the flat plate portion 71 are directed toward the output side. And a spring portion 72 that is obliquely cut and raised in the shape of a tongue piece, and the flat plate portion 71 also has a spring property.

  Next, referring to FIG. 5, the bearing holder 6, the first radial bearing 11, and the method of attaching the biasing member 7 to the stator 4 will be described, and the bearing holder 6, the first radial bearing 11, and the attachment The relationship between the members of the biasing member 7 will be described in detail. As a method for assembling the motor 1, a method of inserting the rotating shaft 31 from the output side of the stator 4 after attaching the bearing holder 6, the first radial bearing 11, and the biasing member 7 to the stator 4. There is a method of attaching the bearing holder 6, the first radial bearing 11, and the urging member 7 to the stator 4 after inserting the rotating shaft 31 into the stator 4. In this embodiment, the latter method is used. Is illustrated.

  When attaching the bearing holder 6, the first radial bearing 11, and the biasing member 7 to the stator 4, the bearing holder 6 is attached to the stator 4 with the first radial bearing 11 inserted into the bearing holder 6. After fixing, the urging member 7 is fixed to the bearing holder 6 in a state where the urging member 7 is fixed to the bearing holder 6 and the first radial bearing 11 is inserted into the bearing holder 6. Later, a second method of attaching the bearing holder 6, the first radial bearing 11, and the biasing member 7 to the stator 4, and after fixing the biasing member 7 to the bearing holder 6, the first radial is mounted on the bearing holder 6. There is a third method in which the bearing 11 is inserted and then the bearing holder 6, the first radial bearing 11, and the urging member 7 are attached to the stator 4. In this embodiment, the first method is exemplified. .

  First, as shown in FIGS. 5 (a 1) and (b 1), the first radial bearing 11 has a flange so that the bearing portion 11 a of the first radial bearing 11 enters the inside of the bearing support hole 60 a of the bearing holder 6. The portion 11b is inserted inside the first recess 61a of the bearing holder 6 so that the bearing holder 6 and the first radial bearing 11 are overlapped.

  Next, as shown in FIGS. 5 (a 2) and 5 (b 2), after inserting the rotor 3 inside the stator 4, the bearing so that the first radial bearing 11 is concentric with the opening 4 a of the stator 4. The holder 6 is fixed to the case 49 of the stator 4 by adhesion or welding. As a result, the shaft end on the counter-output side of the rotating shaft 31 passes through the shaft hole 11e of the first radial bearing 11 and is positioned in the circular recess 11d.

  Next, as shown in FIGS. 5 (a3) and 5 (b3), the urging member 7 is oriented so that the root portion 72a of the spring portion 72 is located above and the tip portion 72b of the spring portion 72 is located below. Then, after the biasing member 7 is overlapped on the end face on the opposite output side of the bearing holder 6, for example, the flat plate portion 71 of the biasing member 7 is subjected to laser welding at three locations 71 r to Fix to the bearing holder 6.

  As a result, the flat plate portion 71 of the urging member 7 abuts the projection 11c of the first radial bearing 11 with elasticity, and the flange portion 11b of the first radial bearing 11 is the bottom 61c ( It is pressed against the buttocks support part). Therefore, the urging member 7 presses and fixes the flange portion 11 b of the first radial bearing 11 to the bottom portion 61 c (the flange portion support portion) of the concave portion 61 of the bearing holder 6. Further, the inner peripheral wall 61 d of the concave portion 61 of the bearing holder 6 abuts on the outer peripheral edge of the flange portion 11 b of the first radial bearing 11 around the motor axis L and around the motor axis L of the first radial bearing 11. It functions as a positioning part that defines the angular position. Therefore, the first radial bearing 11 can be fixed in a state facing a predetermined direction around the motor axis L, and this state can be reliably maintained. Furthermore, since the two protrusions 11c are formed at point-symmetrical positions about the motor axis L, the urging force by the urging member 7 is applied to the two protrusions 11c substantially equally, so the first radial bearing 11 does not tilt with respect to the motor axis.

  Further, the distal end portion 72b of the spring portion 72 of the urging member 7 is in contact with the shaft end on the opposite side of the rotating shaft 31, and urges the rotating shaft 31 toward the output side. Accordingly, the urging member 7 has a function of urging the rotating shaft 31 and a function of fixing the first radial bearing 11 to the bearing holder 6, so that the number of parts can be reduced. Can do.

  Further, in the first radial bearing 11, the bearing portion 11 a has a cylindrical shape having an outer diameter dimension substantially the same as the inner diameter dimension of the stator shown in FIG. 1, and the bearing section 11 a is located inside the center hole of the stator 4. It is in a state where it entered. Therefore, the central axis of the bearing portion 11a and the central axis of the stator 4 can be overlapped.

  Furthermore, since the biasing member 7 is held on the end face of the bearing holder 6 by a method such as laser welding, it is not necessary to form a complicated engagement mechanism such as a hook in the bearing holder 6 or the stator 4. The dimension in the direction of the motor axis L can be shortened.

  5 (a3) and 5 (b3), the bearing holder 6, the first radial bearing 11, and the urging member 7 are attached to the stator 4 and then the rotating shaft from the output side of the stator 4 is used. This can also be realized by inserting 31. 5 (a3) and 5 (b3), the biasing member 7 is fixed to the bearing holder 6 in a state where the first radial bearing 11 is inserted into the bearing holder 6, and then the bearing holder 6 The first radial bearing 11 and the method of attaching the urging member 7 to the stator 4, and after the urging member 7 is fixed to the bearing holder 6, the first radial bearing 11 is inserted into the bearing holder 6, and thereafter The bearing holder 6, the first radial bearing 11, and the urging member 7 can also be realized by attaching the stator 4 to the stator 4.

(Configuration of second radial bearing 12 and washer set 5)
6A to 6C are a cross-sectional view, a front view of a plate, and a CC ′ cross-sectional view of a second radial bearing used in a motor to which the present invention is applied, respectively. FIG. 7 is an enlarged cross-sectional view of a region R in FIG.

  The second radial bearing 12 shown in FIGS. 6 (a) and 7 is a sintered oil-impregnated bearing, and includes a cylindrical bearing portion 12a and a flange portion 12b whose diameter is larger than the end on the counter-output side of the bearing portion 12a. Have. Further, as shown in FIGS. 6B, 6C and 7, the plate 19 is formed with a through hole 19a into which the bearing portion 12a of the second radial bearing 12 is fitted. The output side end face of the stator 4 is fixed by a method such as welding.

  As shown in FIG. 7, in the motor 1 of the present embodiment, the rotating shaft 31 passes through the second radial bearing 12 and is rotatably supported. Here, as described with reference to FIG. 5, the rotating shaft 31 is urged to the output side by the urging member 7, so that it is necessary to regulate the position in the direction of the motor axis L. Therefore, in this embodiment, the washer set 5 is inserted in the rotating shaft 31 so that the washers can come into sliding contact with each other between the permanent magnet 32 and the second radial bearing 12.

  The washer set 5 includes a first washer 51 adjacent to the output side end surface of the permanent magnet 32, a second washer 52 adjacent to the counter output side end surface of the second radial bearing 12, and the first washer 51 and the first washer 51. And a third washer 53 located between the two washers. Here, the first washer 51 is fixed to the rotor 3 by being press-fitted and fixed to the rotating shaft 31, and is in contact with the end face of the permanent magnet 32. On the other hand, the second washer 52 and the third washer 53 are rotatable relative to the rotation shaft 31.

  In the present embodiment, the first washer 51 and the second washer 52 have the same outer diameter, whereas the third washer 53 has an outer diameter larger than that of the first washer 51 and the second washer 52. Is smaller. Therefore, in the washer set 5, adjacent washers have different outer diameter dimensions.

  The first washer 51, the second washer 52, and the third washer 53 are all thin resin rings. In this embodiment, the first washer 51, the second washer 52, and the third washer 53 are made of a nylon sheet containing a solid lubricant such as graphite.

  In the motor 1 configured as described above, the rotating shaft 31 is urged to the output side by the urging member 7, but the direction of the motor axis L of the rotating shaft 31 by the washer set 5 and the second radial bearing 12. The location is restricted. In the washer set 5, the first washer 51 is fixed to the rotor 3, but the second washer 52 and the third washer 53 are rotatable relative to the rotation shaft 31. When the rotor 3 rotates, between the first washer 51 and the third washer 53, between the third washer 53 and the second washer 52, between the second washer 52 and the second radial bearing 12 Since sliding occurs between the end faces, useless force is not applied to the rotor 3.

(Main effects of this form)
As described above, in the motor 1 of the present embodiment, the flange portion 11b is projected from the bearing portion 11a of the first radial bearing 11 in the radial direction, and the flange portion is held by the biasing member 7 held by the stator 4. Since the structure in which 11b is pressed and fixed toward the bottom 61c (saddle support portion) of the recess 61 of the bearing holder 6 is employed, the first radial bearing 11 is always held in the bearing holder 6 in an appropriate posture. Further, since it is not necessary to press-fit the bearing portion 11a of the first radial bearing 11 into the bearing support hole 60a of the bearing holder 6, the bearing support hole 60a is not deformed when the first radial bearing 11 is disposed. . Therefore, the first radial bearing 11 can be arranged with high accuracy.

  Further, since the urging member 7 has a spring property to press and fix the flange portion 11b with elasticity, the urging member 7 can reliably press and fix the flange portion 11b to the bearing holder 6. In addition, on the surface of the first radial bearing 11 that overlaps with the biasing member 7, a protrusion 11 c that protrudes from the motor axis is formed, and the protrusion 11 c is formed at two locations across the motor axis L. . Therefore, the flange portion 11b can be pressed and fixed to the bearing holder 6 without the central axis of the bearing portion 11a of the first radial bearing 11 being inclined with respect to the motor axis L.

  Furthermore, in this embodiment, since the flange 11b of the first radial bearing 11 is inserted into the recess 61 of the bearing holder 6, the dimension of the motor 1 in the direction of the motor axis L can be shortened. And the inner peripheral wall 61d of the recessed part 61 can be utilized as a positioning part which prescribes | regulates the angular position around the motor axis L of the 1st radial bearing 11. FIG. Further, since the flange 11b of the first radial bearing 11 enters the recess 61 of the bearing holder 6 so that the recess 61 and the flange 11b are securely engaged, the flange 11b does not rattle in the circumferential direction. The position restriction of the first radial bearing 11 in the circumferential direction can be reliably performed.

  Further, on the output side in the direction of the motor axis L, when supporting the rotor 3 in the thrust direction, the washers can be slidably contacted with each other between the permanent magnet 32 and the second radial bearing 12 on the rotary shaft 31. A washer set 5 is used. For this reason, when the rotor 3 rotates, washers slide. Therefore, in the case where the second washer 52 is made of resin, regardless of the material of the second radial bearing 12, for example, good slidability can be obtained even if the second radial bearing 12 made of metal is used. High slidability can be realized.

  Further, since the adjacent washers in the washer set 5 have different outer diameters, the outer peripheral edges of the adjacent washers do not overlap, so even if there are burrs on the outer peripheral edge of the washer, There is no interference and the washer slides well. In addition, since the contact area between the washers is defined by the size of the third washer 53 having a small outer diameter, the contact area between the washers is narrow and the sliding loss is small, so that high slidability is achieved. Can be realized. Therefore, the washer set 5 and the second radial bearing 12 can support the rotor 3 in the thrust direction with high slidability and no rotation unevenness occurs.

  Although the second washer 52 is made of resin, a sintered oil-impregnated bearing can be used as the second radial bearing 12, and such a radial bearing provides a highly reliable bearing at a relatively low cost. can do.

  Further, in the washer set 5, the first washer 51 adjacent to the end face of the permanent magnet 32 is fixed to the rotor 3, and the first washer 51 rotates integrally with the rotor 3. For this reason, since the 1st washer 51 does not slide with respect to the permanent magnet 32, the situation where the permanent magnet 32 wears can be avoided. In particular, in this embodiment, since a sintered rare earth magnet is used as the permanent magnet 32, good magnetic characteristics can be obtained, but there is a drawback that it is weak against abrasion. Since the washer 51 does not slide with respect to the permanent magnet 32, even if a sintered rare earth magnet is used as the permanent magnet 32, wear does not occur.

(Other embodiments)
In the above embodiment, the two protrusions 11c formed on the first radial bearing 11 are formed at point-symmetric positions around the motor axis L, but the formation positions of the two protrusions 11c are not limited to this. .

  In the above embodiment, the protrusion 11c is formed on the surface of the flange portion 11b of the first radial bearing 11 that overlaps the biasing member 7. However, even if the protrusion is formed on the surface of the biasing member 7 that overlaps the flange portion 11b. Well, it is preferable to form a plurality of such protrusions, for example, at two positions sandwiching the motor axis L.

  In addition, a plurality of protrusions protruding from the motor axis L are provided on one of the surface of the bearing holder 6 that overlaps with the flange 11b and the surface of the flange 11b that overlaps with the bearing holder 6, for example, 2 sandwiching the motor axis L It may be formed at a location, and in such a case, it is compared with a configuration in which the flange support portion of the bearing holder 6 (the bottom portion 61c of the recess 61) and the flange portion 11b of the first radial bearing 11 are surface-bonded. Thus, the flange portion 11b can be reliably pressed and fixed to the flange support portion of the bearing holder 6.

  Moreover, although the structure which hold | maintained the biasing member 7 in the end surface of the bearing holder 6 was employ | adopted in the said form, you may employ | adopt the structure by which the biasing member 7 is hold | maintained in the other location. That is, in the above embodiment, a configuration is used in which the biasing member 7 is held on the end surface of the bearing holder 6 by a method such as laser welding, but the end surface of the bearing holder 6 is not used as the welding surface. You may employ | adopt the structure which hold | maintained the biasing member 7 to the surface, the end surface of the stator 4, or the outer peripheral surface by methods, such as laser welding.

  In the above embodiment, the washer constituting the washer set 5 is made of resin, but may be made of metal. In the above embodiment, the washer set 5 is constituted by a total of three washers. However, a plurality of third washers 53 may be used, and the washer set 5 may be constituted by a total of four or more washers. Further, in the above-described embodiment, the first washer 51 is fixed to the rotor 3 by press-fitting the first washer 51 with respect to the rotating shaft 31. However, the first washer using an adhesive is used. 51 may be fixed to the rotor 3. Moreover, in the said form, since the thing with the same outer diameter dimension was used as the 1st washer 51 and the 2nd washer 52, the kind of washer which should be prepared could be reduced, but all the outer diameter dimensions are different. The washer set 5 may be configured using the washer.

1A to 1D are a plan view of a motor to which the present invention is applied, a right side view in which the upper half is cut away, a front view of the motor viewed from the output side in the motor axial direction, and a rear view. . (A), (b) is the rear view which looked at the bearing holder used for the motor to which this invention is applied from the non-output side in a motor axial direction, and AA 'sectional drawing. (A)-(c) is the back view, bottom view, and BB 'sectional view which looked at the 1st radial bearing used for the motor to which the present invention is applied from the counter-output side in the motor axial direction, respectively. (A), (b) is the front view of the back view which looked at the biasing member used for the motor to which this invention is applied from the counter-output side in a motor axial direction, and a right view, respectively. It is explanatory drawing which shows a structure when the bearing holder used for the motor to which this invention is applied, the 1st radial bearing, and the biasing member are mutually combined. (A)-(c) is respectively sectional drawing of the 2nd radial bearing used for the motor to which this invention is applied, a front view of a plate, and CC 'sectional drawing. It is an expanded sectional view of the area | region R in FIG.1 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 3 Rotor 4 Stator 6 Bearing holder 7 Energizing member (support member)
11 1st radial bearing 11a Bearing part 11b ridge part 12 2nd radial bearing 31 Rotating shaft 32 Permanent magnet

Claims (10)

In a motor having a rotor including a rotating shaft having a permanent magnet, a stator disposed on the outer peripheral side of the rotor, a bearing that supports the rotating shaft, and a bearing holder that holds the bearing,
The bearing includes a bearing portion that supports the rotating shaft, and a flange portion that projects in a radial direction from the bearing portion,
The bearing holder includes a bearing support hole into which the bearing portion is inserted, and a flange support portion that overlaps with the flange on one side in the motor axial direction.
The bearing holder or the stator holds a support member that presses and fixes the flange toward the flange support .
The bearing holder includes a positioning portion that contacts the bearing around the motor axis and defines an angular position around the motor axis of the bearing,
In the bearing holder, the flange support portion includes a bottom portion of a recess recessed in the motor axial direction.
The bearing is held by the bearing holder by the bearing portion being inserted into the bearing support hole in a state where the flange portion enters the inside of the recess.
An inner peripheral surface of the concave portion serves as the positioning portion . The concave portion includes a substantially rectangular concave portion,
The motor according to claim 1, wherein the flange portion has a substantially rectangular shape in which a contour shape of the bearing viewed from the motor axial direction is engageable with the recessed portion. The motor according to claim 1, wherein the support member has a spring property that elastically presses and fixes the flange toward the flange support. 4. The motor according to claim 1, wherein the support member is held on the other end surface of the bearing holder in the motor axial direction. 5. The bearing is formed with a through hole through which the shaft end of the rotating shaft is inserted in the motor axial direction.
The motor according to any one of claims 1 to 4, wherein the support member is formed with a spring portion that urges the shaft end of the rotating shaft toward one side in the motor axial direction. A plurality of protrusions protruding in a motor axis direction are formed on one of a surface of the support member that overlaps the flange and a surface of the flange that overlaps the support member. Item 6. The motor according to any one of Items 1 to 5. A plurality of protrusions that protrude along a motor axis are formed on one of a surface of the bearing holder that overlaps with the flange and a surface of the flange that overlaps with the bearing holder. The motor according to any one of 1 to 6. The motor according to claim 6 or 7, wherein the protrusion is formed at two positions sandwiching the motor axis. The bearing portion is cylindrical.
The bearing support hole is formed in a circular shape having an inner diameter dimension substantially the same as the outer diameter dimension of the bearing portion,
The protrusions are formed at two locations sandwiching the motor axis, and are formed at positions that overlap the contour of the bearing and the opening edge of the bearing support hole when viewed from the motor axis direction. The motor according to claim 6. The motor according to any one of claims 1 to 9, wherein the bearing portion is formed in a cylindrical shape having an outer diameter dimension substantially the same as an inner diameter dimension of the stator.