JP5988832B2 - motor - Google Patents

Description

  The present invention relates to a motor in which a bearing member is held by an end plate at an end portion of a stator.

  In a motor such as a stepping motor, when a bearing mechanism that rotatably supports a rotating shaft is configured, a structure in which a bearing member disposed at an end of the stator is held between the stator and an end plate is proposed. (See Patent Document 1).

  In the motor having such a configuration, the bearing member includes rectangular engagement portions that overlap the end surface of the stator at a plurality of locations in the circumferential direction, and the end plate includes rectangular openings that each fit the plurality of engagement portions in the circumferential direction. It is provided in several places. For this reason, since the end plate does not overlap with the engaging portion of the bearing member in the motor axial direction, the dimension in the motor axial direction around the stator can be reduced. In addition, the circumferential dimension (width dimension) of the plurality of engaging portions is substantially the same as the circumferential dimension (width dimension) of the plurality of openings. Therefore, when the engaging portion is fitted into the opening, the outer edges on both sides in the circumferential direction of the plurality of engaging portions are in contact with the inner edges on both sides in the circumferential direction of the plurality of openings. Positioning in the circumferential direction can be performed.

JP 2004-140925 A

  However, in the case of the configuration described in Patent Document 1, each of the plurality of engaging portions fits in the plurality of openings to perform circumferential positioning of the bearing member and the end plate. When a location with low dimensional accuracy occurs in any of the plurality of openings, there is a problem that the engaging portion cannot be fitted into the opening and it is difficult to properly overlap the bearing member and the end plate.

  In view of the above problems, an object of the present invention is to provide a motor capable of efficiently overlapping a bearing member and an end plate with an appropriate positional relationship.

In order to solve the above-described problems, the present invention provides a rotor having a rotating shaft, a stator disposed around the rotor, and the rotating shaft being rotatable at one end in the motor axial direction of the stator. A motor comprising: a bearing member to be supported; and an end plate that overlaps the bearing member from the opposite side of the stator and holds the bearing member between the stator and the stator. Engaging portions that overlap the end surface are provided at a plurality of locations in the circumferential direction, and the end plate is provided with opening portions at which the plurality of engaging portions are respectively fitted at a plurality of locations in the circumferential direction, and the peripheral portion between the bearing member and the end plate is provided. direction positioning is performed with the engagement portion of the predetermined one point of said plurality of positions by the said opening, in the circumferential direction between the engaging portion and the opening in one position in which the predetermined The gap is a predetermined one piece. And wherein the smaller than the gap between the opening portion and the engaging portion in the other.

In the present invention, in the structure in which the bearing member disposed at the end of the stator is held between the stator and the stator by the end plate, the bearing member includes engagement portions that overlap the end face of the stator at a plurality of locations in the circumferential direction. The end plate includes openings at a plurality of locations in the circumferential direction in which a plurality of engaging portions are respectively fitted. For this reason, since the end plate does not overlap with the engaging portion of the bearing member in the motor axial direction, the dimension in the motor axial direction around the stator can be reduced. Here, when positioning the bearing member and the end plate in the circumferential direction, the positioning is performed by a predetermined engaging portion and an opening of a plurality of locations. It is sufficient that the dimensional accuracy is high in the joint portion and the opening portion, and the engaging portion and the opening portion at other locations do not need high dimensional accuracy if the engaging portion can be fitted into the opening portion. Therefore, since the situation that the engaging portion cannot be fitted into the opening is unlikely to occur, the bearing member and the end plate can be efficiently stacked with an appropriate positional relationship.

  In the present invention, the edge on the opposite side of the outer peripheral surface of the engaging portion from the side on which the stator is located, and at least one of the edges on the inner peripheral surface of the opening where the stator is located are tapered. It is preferable that it is a surface. According to such a configuration, the engaging portion can be easily fitted into the opening, so that the bearing member and the end plate can be efficiently overlapped.

  In the present invention, each of the plurality of engaging portions protrudes radially outward from the center side of the bearing member, and circumferential positioning of the bearing member and the end plate is performed in the engaging portion. It is preferable that the side surface portion extending radially outward is in contact with the inner peripheral surface of the opening. According to such a configuration, the bearing member and the end plate can be positioned in the circumferential direction with a simple configuration.

  In the present invention, among the plurality of engaging portions and the plurality of openings, the engaging portion and the opening formed at the one place have a circumferential width as compared with the other engaging portions and the opening. Preferably the dimensions are narrow.

  In the present invention, the end plate is an urging member including a leaf spring portion that urges the rotating shaft in the motor axial direction, and the leaf spring portion has a tip portion out of the plurality of engaging portions. It is preferable that one of the two is cut and raised so as to face the angular direction in which it is located.

  In the present invention, a portion extending in the circumferential direction on the outer peripheral surface of the engaging portion and a portion extending in the circumferential direction on the inner peripheral surface of the opening portion protrude toward the other side portion. It is preferable that a convex portion for positioning the bearing member and the end plate in the radial direction is formed by contacting the other side portion. According to such a configuration, the outer peripheral surface of the engaging portion and the inner peripheral surface of the opening portion are in contact with each other via the convex portion in the radial direction. Therefore, when the bearing member and the end plate are overlapped, the engaging portion is It can be easily fitted into the opening.

  In the present invention, the convex portion preferably has a semicircular planar shape. According to such a configuration, even when the engaging portion is difficult to fit into the opening due to the influence of dimensional tolerance, when the engaging portion is fitted into the opening, the convex portion is deformed if a little large force is applied. When overlapping the plate, the engaging portion can be easily fitted into the opening.

  In this invention, it is preferable that the said convex part is formed in the outer peripheral surface of all these some engaging parts, or the inner peripheral surface of all these several opening parts. According to such a configuration, the radial positioning between the bearing member and the end plate can be reliably performed, and even in this case, the engaging portion can be easily fitted into the opening.

  In the present invention, the engaging portion and the opening are substantially rectangular, and the convex portion is a radially outermost portion of the engaging portion, or a radially outermost portion of the opening. It is possible to adopt the configuration formed in the above.

  In this invention, it is preferable that the said convex part is formed in the said bearing member side, and the edge on the opposite side to the side in which the said stator is located in the outer peripheral surface of the said convex part is a taper surface. According to this configuration, when the bearing member and the end plate are overlapped, the engaging portion can be easily fitted into the opening.

  In this invention, it is preferable that the said convex part is formed in the said end plate side, and the edge by which the said stator is located in the outer peripheral surface of the said convex part is a taper surface. According to this configuration, when the bearing member and the end plate are overlapped, the engaging portion can be easily fitted into the opening.

In the present invention, in the structure in which the bearing member disposed at the end of the stator is held between the stator and the stator by the end plate, the bearing member includes engagement portions that overlap the end face of the stator at a plurality of locations in the circumferential direction. The end plate includes openings at a plurality of locations in the circumferential direction in which a plurality of engaging portions are respectively fitted. For this reason, since the end plate does not overlap with the engaging portion of the bearing member in the motor axial direction, the dimension in the motor axial direction around the stator can be reduced. Here, when positioning the bearing member and the end plate in the circumferential direction, the positioning is performed by a predetermined engaging portion and an opening of a plurality of locations. It is sufficient that the dimensional accuracy is high in the joint portion and the opening portion, and the engaging portion and the opening portion at other locations do not need high dimensional accuracy if the engaging portion can be fitted into the opening portion. Therefore, since the situation that the engaging portion cannot be fitted into the opening is unlikely to occur, the bearing member and the end plate can be efficiently stacked with an appropriate positional relationship.

It is explanatory drawing of the motor to which this invention is applied. It is explanatory drawing of the outer stator core of the motor which concerns on Embodiment 1 of this invention. It is explanatory drawing of the bearing member of the motor which concerns on Embodiment 1 of this invention. It is explanatory drawing of the end plate of the motor which concerns on Embodiment 1 of this invention. It is explanatory drawing of a mode that the end plate was piled up on the bearing member in the motor which concerns on Embodiment 1 of this invention. It is explanatory drawing of a mode that the end plate was piled up on the bearing member in the motor which concerns on Embodiment 2 of this invention. It is sectional drawing of the end plate of the motor which concerns on Embodiment 3 of this invention.

  An example of a motor to which the present invention is applied will be described with reference to the drawings. In the following description, in the motor axial direction L, the side on which the rotating shaft 50 protrudes from the stator 40 is referred to as an output side L1, and the side opposite to the side on which the rotating shaft 50 protrudes from the stator 40 is the opposite output side. This will be described as L2.

[Embodiment 1]
(overall structure)
FIG. 1 is an explanatory diagram of a motor according to Embodiment 1 of the present invention, and FIGS. 1A and 1B are a half sectional view of the motor and a rear view of the motor as viewed from the non-output side.

  A motor 1 shown in FIG. 1 is a stepping motor used for driving an optical head or the like in an optical disc driving apparatus such as a DVD or a Blu-ray disc, and has a cylindrical stator 40. The stator 40 has a structure in which an A-phase stator and a B-phase stator are arranged so as to overlap in the motor axial direction L. For this reason, in the stator 40, two annular coil bobbins 2 (the first coil bobbin 2A and the second coil bobbin 2B) around which the coil wire 20 is wound are disposed so as to overlap each other in the motor axial direction L, and the coil bobbin 2 In each, an inner stator core 3 and an outer stator core 4 are arranged to overlap each other. More specifically, an annular inner stator core 3A and an outer stator core 4A having a U-shaped cross section are disposed on both sides of the first coil bobbin 2A in the motor axial direction L, and the motor axis line in the second coil bobbin 2B. On both sides in the direction L, an annular inner stator core 3B and an outer stator core 4B having a U-shaped cross section are disposed so as to overlap each other. A plurality of pole teeth 31 and 41 of the inner stator cores 3A and 3B and the outer stator cores 4A and 4B are arranged in the circumferential direction on the inner peripheral surfaces of the first coil bobbin 2A and the second coil bobbin 2B. Thus, the cylindrical stator 40 provided with the rotor arrangement | positioning hole 30 is comprised, and the rotor 5 is coaxially arrange | positioned inside the stator 40 radial direction. In this embodiment, the outer stator cores 4A, 4B each extend to the outside in the radial direction of the first coil bobbin 2A and the second coil bobbin 2B to constitute the motor case 10.

  The coil bobbin 2 (first coil bobbin 2A and second coil bobbin 2B) is made of resin, and the terminal block 25 (25A, 25B) for holding the terminal 91 (terminals 91A, 91B) is integrally formed on the coil bobbin 2. Yes. The terminals 91 (terminals 91A and 91B) protrude radially outward from the motor case 10 and are connected to a wiring material (not shown) such as a flexible wiring board.

  In the rotor 5, the rotating shaft 50 extends in the motor axial direction L, and a cylindrical permanent magnet 59 is fixed by an adhesive 56 at a position near the counter-output side L 2 of the rotating shaft 50. The permanent magnet 59 has an outer peripheral surface 590 that is opposed to the pole teeth 31 and 41 of the stator 40 at a predetermined interval on the inner side in the radial direction inside the rotor arrangement hole 30. The rotating shaft 50 is made of a metal material such as stainless steel, brass, and aluminum. The outer peripheral surface 57 of the rotating shaft 50 that protrudes from the stator 40 (the output side L1) has an optical head (not shown). A spiral groove 58 is formed in which the rack formed on the side is engaged. In the rotating shaft 50, the portion where the spiral groove 58 is formed has a larger diameter than the portion where the permanent magnet 59 is fixed.

(Configuration of plate 65)
A plate 65 is provided on the output side L1 with respect to the stator 40. The plate 65 opposes the fixed plate portion 651 fixed to the end surface 48 of the output side L1 of the stator 40 (end surface of the output side L1 of the motor case 10) by a method such as welding, and faces the fixed plate portion 651 on the output side L1. A support plate portion 652 that supports the end portion 51 on the output side L1 of the rotary shaft 50, and a connection plate portion 653 that extends in the motor axial direction L and connects the fixed plate portion 651 and the support plate portion 652. ing. The fixed plate portion 651 is formed with a hole 650 that passes through the rotation shaft 50.

(Bearing structure of output side L1)
In the plate 65, the support plate portion 652 is configured with an output side L1 bearing mechanism 6 that supports the end portion 51 on the output side L1 of the rotary shaft 50 so as to be rotatable in the motor axial direction L and the radial direction. In the bearing mechanism 6, the bearing member 60 on the output side L 1 is fixed to the support plate portion 652 of the plate 65, and the end portion 51 on the output side L 1 of the rotating shaft 50 is the end surface of the bearing member 60 on the counter-output side L 2. And is supported by being fitted inside the recess 61 that is recessed toward the output side L1. The bearing member 60 has a large-diameter portion 64 that abuts against the surface on the counter-output side L2 of the support plate portion 652 while passing through a hole 656 formed in the support plate portion 652 of the plate 65. The movement to the output side L1 is restricted by the large diameter portion 64. In the rotary shaft 50, the end portion 51 on the output side L1 has a smaller diameter than the portion where the spiral groove 58 is formed, and is processed into a hemispherical shape.

(Configuration of outer stator core 4B)
Before describing the detailed configuration of the bearing mechanism 7 on the counter-output side L2, the configuration of the B-phase outer stator core 4B that constitutes the end surface of the counter-output side L2 of the stator 40 will be described.

  FIG. 2 is an explanatory diagram of the outer stator core 4B of the motor 1 according to the first embodiment of the present invention. FIGS. 2A, 2B, and 2C show the outer stator core 4B with the pole teeth 41 protruding. FIG. 4 is a plan view, a side view, and a cut end view when cut along the line POP ′.

  1 and 2, in the motor 1 of the present embodiment, the outer stator core 4B is configured as a case member constituting the motor case 10, and thus has a U-shaped cross section. More specifically, the outer stator core 4B includes an annular portion 45, a plurality of pole teeth 41 cut and raised from the inner peripheral edge of the annular portion 45 to the output side L1 in the motor axial direction L, and the annular portion 45. A cylindrical tube portion 46 extending from the outer peripheral edge to the output side L1 in the motor axial direction L and facing the pole teeth 41 on the outer side in the radial direction, and on the opposite output side L2 of the annular portion 45 The surface constitutes an end face 49 on the counter-output side L2 of the stator 40. The outer stator core 4B is disposed so as to overlap the coil bobbin 2 around which the coil wire 20 is wound. As a result, the coil bobbin 2 is disposed between the pole teeth 41 and the cylindrical portion 46. Here, at the inner peripheral edge of the annular portion 45, a portion sandwiched between the pole teeth 41 adjacent in the circumferential direction is a recess 451 cut out radially outward, and the recess 451 will be described later. The bearing member 70 to be positioned is positioned in the circumferential direction. A notch 452 that is further cut out in a circular arc shape is formed in a part of the concave portion 451, and the notch 462 is a positioning pin when positioning the outer stator core 4B and the bearing member 70. (Jig / not shown) is inserted.

  Two notches 461 and 468 that are notched in the motor axial direction L are formed at the front end edge of the cylindrical portion 46, and when the outer stator core 4B and the coil bobbin 2 are combined, the outer stator core 4B The coil bobbin 2 is aligned so that the notch 461 having a large circumferential dimension among the notches 461 and 468 overlaps the terminal block 25 of the coil bobbin 2 in the motor axial direction L.

  In this embodiment, both end portions of the notch 461 are semicircular shallow notches 462, and a step portion 463 that is one step shallower than the bottom of the notch 461 is formed at a position adjacent to the notch 462 in the circumferential direction. ing. As shown in FIG. 1A, convex portions 36 projecting radially outward from the outer peripheral edge of the inner stator core 3B enter the both ends of the notches 461, and the step portions 463 are convex portions 36 of the inner stator core 3B. The inner stator core 3B is positioned by abutting on the motor axial direction L.

  On the other hand, a notch 468 having a small circumferential dimension enters a convex portion 35 that protrudes radially outward from the outer peripheral edge of the inner stator core 3B, and a bottom portion of the notch 468 extends into the convex portion 35 of the inner stator core 3B. The inner stator core 3B is positioned in contact with the direction L. Note that both ends of the notch 468 are formed with notches 469 that are further deeply cut in a semicircular shape.

  The A-phase outer stator core 4A has the same configuration as the B-phase outer stator core 4B, and is arranged symmetrically in the motor axial direction L.

(Schematic configuration of the bearing mechanism 7 on the non-output side L1)
As shown in FIG. 1, in the motor 1 of this embodiment, the end 52 on the counter-output side L2 of the rotary shaft 50 is connected to the end 52 on the counter-output side L2 of the rotary shaft 50 in the motor axial direction L and the radial direction. A bearing mechanism 7 on the counter-output side L2 that is rotatably supported is configured. In this embodiment, a recess 595 that is recessed toward the output side L1 is formed on the end surface of the permanent magnet 59 on the counter-output side L2, and the bearing mechanism 7 projects from the permanent magnet 59 toward the counter-output side L2. The end 52 on the counter-output side L2 of the rotary shaft 50 is rotatably supported inside the recess 595. In the rotating shaft 50, the end 52 on the non-output side L2 is slightly smaller in diameter than the portion to which the permanent magnet 59 is fixed, and is processed into a hemispherical shape.

  In the bearing mechanism 7 on the counter-output side L 2, a disc-shaped bearing member 70 is disposed around the end portion 52 on the counter-output side L 2 of the rotating shaft 50, and the end portion 52 of the rotating shaft 50 is connected to the end of the bearing member 70. It fits inside the cylindrical part 71 and is rotatably supported. An end plate 80 is disposed on the opposite side L2 to the bearing member 70, and the bearing member 70 is held between the end plate 80 and the stator 40. Here, the end plate 80 is configured as a biasing member that biases the rotating shaft 50 toward the output side L1. More specifically, the end plate 80 includes a disc portion 81 fixed to the end face 49 on the counter-output side L2 of the stator 40 by welding or the like, and a leaf spring portion 85 cut and raised at the center portion of the disc portion 81. The disc portion 81 holds the end portion of the bearing member 70 between itself and the stator 40, and the leaf spring portion 85 urges the rotating shaft 50 toward the output side L1. Here, the output side L1 of the rotary shaft 50 is configured with a bearing mechanism 6 on the output side L1 that supports the end 51 of the output side L1 of the rotary shaft 50 so as to be rotatable in the motor axial direction L and the radial direction. . Accordingly, since the rotary shaft 50 is biased so that the end portion 51 on the output side L1 contacts the bearing mechanism 6, when the rotary shaft 50 rotates, the rotary shaft 50 in the motor axial direction L is rotated. Shaking is prevented.

(Detailed configuration of bearing member 70)
FIG. 3 is an explanatory diagram of the bearing member 70 of the motor 1 according to the first embodiment of the present invention. FIGS. 3 (a), (b), (c), (d), and (e) are bearing members. FIG. 7 is a plan view of the 70 viewed from the output side L1, a bottom view, a side view, a QQ ′ cross-sectional view, and an enlarged cross-sectional view of the Q ′ side as viewed from the non-output side L2.

  In FIG. 3, the bearing member 70 includes a cylindrical portion 71 having a hole 79 for supporting the end portion 52 of the rotary shaft 50 on the inside, and a disk portion 72 having a diameter increased at the end on the counter-output side L2 of the cylindrical portion 71. It is a resin part. The bearing member 70 has a plurality of engaging portions 73 extending radially outward from the center side on the surface opposite to the output side L2 of the disk portion 72, and the engaging portions 73 are located on the center side. Are connected. In this embodiment, as the engaging portion 73, three engaging portions 73a, 73b, 73c are formed at substantially equal angular intervals, and each of the engaging portions 73a, 73b, 73c has a substantially rectangular shape. ing. The outer dimension of the bearing member 70 is smaller than the outer dimension of the end surface 49 (the annular portion 45 of the outer stator core 4B) on the counter-output side L2 of the stator 40, and the outer diameter of the disk portion 72 is the inner diameter of the stator 40. It is the same as or slightly larger than the dimension (the inner diameter of the annular portion 45 of the outer stator core 4B).

  Of the three engaging portions 73a, 73b, and 73c, a plate-like detent portion 74 is formed on the opposite side to the engaging portion 73a, and the detent portion 74 includes the engaging portion 73a, Compared to 73b and 73c, the projecting dimension outward in the radial direction is small. Here, the rotation preventing portion 74 protrudes radially outward from the outer peripheral surface of the disc portion 72, while the engaging portion 73 protrudes radially outward from the surface on the counter-output side L <b> 2 of the disc portion 72. For this reason, the rotation prevention part 74 is located in the output side L1 rather than the engaging part 73. FIG. Between the anti-rotation portion 74 and the engaging portion 73a, a spring portion accommodating concave portion 75 extending from the anti-rotation portion 74 to the center of the bearing member 70 (position where the hole 79 is formed) is formed. The spring portion accommodating recess 75 has a tapered surface inclined obliquely from the outer peripheral side toward the center toward the counter-output side L2.

  In the bearing member 70 configured as described above, the engaging portions 73a, 73b, and 73c have basically the same shape, and a pair of side surface portions 731 and 732 extending radially outward, and a diameter And a distal end portion 733 extending in the circumferential direction on the outermost peripheral side in the direction and connected to the side surface portions 731 and 732.

  In any of the three engaging portions 73a, 73b, and 73c, a convex portion 734 that protrudes outward in the radial direction is formed near the center in the circumferential direction of the tip portion 733. In this embodiment, the three convex portions 734 are formed at equiangular intervals in the circumferential direction. For this reason, the convex part 734 formed in the engaging part 73a is formed in the center of the circumferential direction of the engaging part 73a, and the convex part 734 formed in the engaging parts 73b and 73c is the engaging part 73b and 73c. It is formed at a position shifted to one side from the circumferential center. In this embodiment, the convex portion 734 has a semicircular planar shape.

Here, if the circumferential dimensions (width dimensions) of the three engaging portions 73a, 73b, and 73c are W73a, W73b, and W73c, respectively, the width dimensions are as follows: W73a <W73b = W73c
have. That is, the width dimension W73a of the engaging part 73a is smaller than the width dimensions W73b and W73c of the other engaging parts 73b and 73c.

  In this embodiment, the three engaging portions 73 (engaging portions 73a, 73b, 73c) are outer peripheral surfaces including the position where the convex portion 734 is formed and the portion where the spring portion accommodating concave portion 75 is formed. As a whole, an edge on the side opposite to the side on which the stator 40 is located (counter output side L2) is a tapered surface 76 (chamfered surface).

(Detailed configuration of the end plate 80)
4 is an explanatory diagram of the end plate 80 of the motor 1 according to the first embodiment of the present invention. FIGS. 4 (a), 4 (b), 4 (c), and 4 (d) show the end plate 80 on the output side. It is the top view seen from L1, the bottom view seen from the non-output side L2, the side view, and RR 'sectional drawing.

  In FIG. 4, the end plate 80 includes a disc portion 81, a rectangular plate spring portion 85 that is obliquely cut and raised at the center portion of the disc portion 81, and a radially outward direction from the center of the disc portion 81. And a metal plate having an opening 83 extending therethrough. In the end plate 80, the openings 83 are formed at approximately equal angular intervals as openings 83a, 83b, 83c at a plurality of locations in the circumferential direction, but are connected on the center side. Moreover, the front-end | tip part 85a of the leaf | plate spring part 85 has faced the angle direction in which the opening part 83a is located. The outer dimension of the end plate 80 is smaller than the outer dimension of the end surface 49 (the annular portion 45 of the outer stator core 4B) on the counter-output side L2 of the stator 40 and larger than the outer dimension of the bearing member 70.

  In this embodiment, the outer peripheral edge of the disc portion 81 is linearly cut out at a plurality of locations in the circumferential direction, and three straight portions 811, 812, 813 are formed at substantially equal angular intervals. In this embodiment, linear portions 811, 812, 813 are formed at angular positions corresponding to the openings 83a, 83b, 83c.

  In the end plate 80 configured as described above, all of the three openings 83a, 83b, and 83c have a substantially rectangular shape. That is, each of the openings 83a, 83b, and 83c has a pair of side surface parts 831 and 832 extending outward in the radial direction, and the side surface parts 831 and 832 extending in the circumferential direction on the outermost peripheral side in the radial direction. And a distal end portion 833 connected to. Note that a concentric low step 87 is formed in the disc portion 81.

  Here, the leaf spring portion 85 is formed at a position that overlaps with the spring portion accommodating recess 75 of the bearing member 70 when the end plate 80 is overlapped on the non-output side L2 of the bearing member 70. Further, when the end plate 80 is overlapped on the non-output side L <b> 2 of the bearing member 70, the three openings 83 a, 83 b, 83 c are formed at positions that overlap with the engaging portions 73 a, 73 b, 73 c of the bearing member 70, respectively. The engaging portions 73a, 73b, 73c of the bearing member 70 are fitted into the openings 83a, 83b, 83c of the end plate 80, respectively.

Also, assuming that the circumferential dimensions (width dimensions) of the openings 83a, 83b, and 83c are W83a, W83b, and W83c, respectively, the width dimensions are as follows: W83a <W83b = W83c
have. That is, the width dimension W83a of the opening 83a is smaller than the width dimensions W83b and W83c of the other openings 83b and 83c.

Further, when comparing the width dimensions W83a, W83b, W83c of the openings 83a, 83b, 83c with the width dimensions W73a, W73b, W73c of the engaging portions 73a, 73b, 73c described with reference to FIG. Relationship W83a ≒ W73a
W83b> W73b
W83c> W73c
It has become. That is, the width dimension W83a of the opening 83a is slightly larger than the width dimension W73a of the engaging portion 73a, whereas the width dimensions W83b and W83c of the other opening portions 83b and 83c are It is considerably larger than the width dimensions W73b and W73c of 73b and 73c. Therefore, when the end plate 80 is overlapped on the non-output side L2 of the bearing member 70, the engaging portion 73a of the bearing member 70 is fitted into the opening 83a of the end plate 80 so that the bearing member 70 and the end plate 80 are moved in the circumferential direction. The other engaging portions 73b and 73c position the bearing member 70 and the end plate 80 in the circumferential direction even when fitted into the openings 83b and 83c of the end plate 80. Does not function.

  Further, the radial dimension (length dimension) of the openings 83a, 83b, 83c is the same as the radial dimension (length dimension) of the engaging parts 73a, 73b, 73c including the convex part 734 of the bearing member 70. Almost equal. For this reason, when the end plate 80 is overlapped on the non-output side L2 of the bearing member 70, the engaging portions 73a, 73b, 73c of the bearing member 70 are connected to the openings 83a, 83b, It abuts on the tip end portion 833 of 83c and exhibits the function of positioning the bearing member 70 and the end plate 80 in the radial direction.

(Assembly process of bearing mechanism 7)
FIGS. 5A and 5B are explanatory views showing a state in which the end plate 80 is stacked on the bearing member 70 in the motor 1 according to the first embodiment of the present invention. FIGS. It is explanatory drawing and sectional drawing which looked at the state which accumulated 80 from the non-output side L2 (end plate 80 side). In FIG. 5A, the end plate 80 is hatched to the right.

  In the manufacturing process of the motor 1 of this embodiment, when the bearing mechanism 7 is assembled, the rotor 65 is disposed inside the stator 40 after the plate 65 is attached to the stator 40, and then the bearing member 70 and the end plate 80. Is provided at the end of the stator 40 opposite to the output side L2.

  In that case, after attaching the bearing member 70 to the stator 40, the end plate 80 is piled up. The bearing member 70 and the end plate 80 may be attached to the stator 40 after the end plate 80 is stacked on the bearing member 70. In any case, as shown in FIG. 5, the end plate 80 is overlaid on the non-output side L <b> 2 of the bearing member 70. In this state, the leaf spring portion 85 is positioned inside the spring portion accommodating recess 75 of the bearing member 70. Further, the engaging portions 73 (engaging portions 73a, 73b, 73c) of the bearing member 70 are fitted into the opening portions 83 (opening portions 83a, 83b, 83c) of the end plate 80, respectively. In the leaf spring portion 85, the tip end portion 85 a faces the angular direction in which the engaging portion 73 a is located among the plurality of engaging portions 73.

  Here, when the engaging portion 73a of the bearing member 70 is fitted into the opening 83a of the end plate 80, the side surface portions 731 and 732 abut against the side surface portions 831 and 832 respectively, and the bearing member 70 and the end plate 80 Is positioned in the circumferential direction. However, even if the other engaging portions 73b and 73c are fitted in the openings 83b and 83c of the end plate 80, a gap is interposed between the side surface portions 731 and 732 and the side surface portions 831 and 832. And the function of positioning the end plate 80 in the circumferential direction. Further, the engaging portions 73a, 73b, and 73c of the bearing member 70 abut on the tip portions 833 of the openings 83a, 83b, and 83c of the end plate 80 via the convex portion 734, and the bearing member 70 and the end plate 80 are Positioned in the radial direction.

  Further, in a state where the bearing member 70 is overlapped with the end face 49 (the annular portion 45 of the outer stator core 4B) on the counter-output side L2 of the stator 40, the engaging portions 73 (73a, 73b, 73c) of the bearing member 70 are the stator 40. The position of the bearing member 70 in the motor axial direction L is defined by overlapping with the end face 49 on the opposite output side L2. Further, the rotation preventing portion 74 of the bearing member 70 is fitted into the recess 451 of the annular portion 45 of the outer stator core 4B, and the rotation of the bearing member 70 is performed. In that case, the front-end | tip part of the rotation prevention part 74 of the bearing member 70 contact | abuts to the deep bottom part of the recessed part 451 of the annular part 45 of the outer stator core 4B. Further, the disk portion 72 of the bearing member 70 is fitted inside the annular portion 45 of the outer stator core 4 </ b> B, and the bearing member 70 is coaxial with the stator 40.

  Thereafter, as shown in FIG. 1B, of the outer peripheral edge of the disc portion 81 of the end plate 80, the straight portions 811, 812, 813 are connected to the annular portion 45 of the outer stator core 4B (the end face 49 of the stator 40). Welding S is performed. As a result, the bearing member 70 is held between the end plate 80 and the end face 49 on the counter-output side L2 of the stator 40 (the annular portion 45 of the outer stator core 4B). Specifically, the bearing member 70 is prevented from moving to the output side L <b> 1 when the engaging portion 73 contacts the end surface 49 of the stator 40, and the disc portion 72 contacts the disc portion 81 of the end plate 80. This prevents the movement toward the non-output side L2.

(Main effects of this form)
As described above, in the motor 1 of this embodiment, when the bearing member 70 disposed at the end of the stator 40 is held between the stator 40 by the end plate 80, the bearing member 70 is the stator 40. Engaging portions 73 that overlap the end surface 49 are provided at a plurality of locations in the circumferential direction, and the end plate 80 includes openings 83 at which the plurality of engaging portions 73 are fitted respectively at a plurality of locations in the circumferential direction. For this reason, since the end plate 80 does not overlap with the engaging portion 73 of the bearing member 70 in the motor axial direction L, the dimension in the motor axial direction L around the stator 40 can be reduced. Further, in the bearing member 70, since the engaging portions 73 that overlap the end surface 49 of the stator 40 are formed at a plurality of locations, the bearing member 70 is supported on the end surface 49 of the stator 40 in a stable state. In particular, in this embodiment, since the engaging portions 73 are formed at three locations in the circumferential direction, the bearing member 70 is supported in a stable state on the end surface 49 of the stator 40.

  Here, when positioning the bearing member 70 and the end plate 80 in the circumferential direction, the positioning is performed by the engaging portion 73a and the opening 83a at one of the plurality of locations. For this reason, it is sufficient that the dimensional accuracy is high in the one engaging portion 73a and the opening 83a, and the engaging portion 73 is the opening 83 in the other engaging portions 73b and 73c and the openings 83b and 83c. High dimensional accuracy is not required as long as it can be fitted. Therefore, since the situation that the engaging portion 73 cannot be fitted into the opening 83 is unlikely to occur, the bearing member 70 and the end plate 80 can be efficiently stacked with an appropriate positional relationship.

  Of the plurality of engagement portions 73 and the plurality of openings 83, the engagement portions 73a and the openings 83a that contribute to the positioning in the circumferential direction are compared to the other engagement portions 73b and 73c and the openings 83b and 83c. Since the width dimension is narrow, there is an advantage that it is easy to obtain dimensional accuracy, and it is possible to reliably manufacture and assemble parts.

  Further, the leaf spring portion 85 provided on the end plate 80 extends from the position sandwiched between the two openings 83 toward the side where the other openings 83 are located. Can be arranged without. And the leaf | plate spring part 85 has orient | assigned the front-end | tip part 85a to the angular direction in which the engaging part 73a and the opening part 83a which contribute to the positioning of the circumferential direction are located. For this reason, if the direction of the leaf | plate spring part 85 is confirmed, the angular direction in which the engaging part 73a and the opening part 83a which contribute to circumferential positioning can be discriminate | determined easily.

  Further, the circumferential positioning of the bearing member 70 and the end plate 80 is performed by the side surface portions 731 and 732 extending radially outward in the engaging portion 73a coming into contact with the inner edge of the opening portion 83a. The circumferential positioning of the bearing member 70 and the end plate 80 can be performed with a simple configuration.

  Further, since the edge of the outer peripheral surface of the engaging portion 73 opposite to the side where the stator 40 is located is the tapered surface 76, the engaging portion 73 can be easily fitted into the opening 83. Therefore, the bearing member 70 and the end plate 80 can be efficiently stacked.

  Further, in the present embodiment, a convex portion 734 that positions the bearing member 70 and the end plate 80 in the radial direction is formed at the distal end portion 733 that extends in the circumferential direction at the outer edge of the engaging portion 73 of the bearing member 70. Therefore, the distal end portion 733 of the engaging portion 73 of the bearing member 70 and the distal end portion 833 of the opening 83 of the end plate 80 are in contact with each other via the convex portion 734 in the radial direction. Therefore, when the bearing member 70 and the end plate 80 are overlapped, the engaging portion 73 can be easily fitted into the opening 83.

  Here, since the convex portion 734 has a semicircular planar shape, even when the engaging portion 73 is difficult to fit into the opening portion 83 due to the influence of dimensional tolerance, the engaging portion 73 is fitted into the opening portion 84. If a little big force is applied, the convex part 734 will deform | transform. Therefore, when the bearing member 70 and the end plate 80 are overlapped, the engaging portion 73 can be easily fitted into the opening 83.

  Moreover, since the convex part 734 is formed in all the engaging parts 73, the radial positioning of the bearing member 70 and the end plate 80 can be reliably performed. It can be easily fitted into the opening 83. Moreover, since the outer peripheral surface of the engaging portion 73, including the portion where the convex portion 734 is formed, has an edge on the opposite side to the side where the stator 40 is located, the tapered surface 76. The portion 73 can be easily fitted into the opening 83.

[Embodiment 2]
FIG. 6 is an explanatory diagram showing a state in which the end plate 80 is overlaid on the bearing member 70 in the motor 1 according to the second embodiment of the present invention. In FIG. 6, the end plate 80 is hatched to the right. In addition, since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment, the convex portion 734 for positioning the bearing member 70 and the end plate 80 in the radial direction is formed in the engaging portion 73 of the bearing member 70. However, in this embodiment, as shown in FIG. A convex portion 834 that protrudes toward the engaging portion 73 is formed at the tip portion 833 of the opening 83 of the end plate 80, and the convex portion 834 has a semicircular planar shape.

  Even in such a configuration, as in the first embodiment, the distal end portion 733 of the engaging portion 73 of the bearing member 70 and the distal end portion 833 of the opening 83 of the end plate 80 are in contact with each other via the convex portion 834 in the radial direction. become. Therefore, when the bearing member 70 and the end plate 80 are overlapped, the engaging portion 73 can be easily fitted into the opening 83. Further, since the convex portion 834 has a semicircular planar shape, even when the engaging portion 73 is difficult to fit into the opening portion 83 due to the influence of dimensional tolerance, when the engaging portion 73 is fitted into the opening portion 83, If a little big force is applied, the convex part 834 will deform | transform. Therefore, when the bearing member 70 and the end plate 80 are overlapped with each other, the same effects as those of the first embodiment can be obtained, for example, the engaging portion 73 can be easily fitted into the opening 83.

[Embodiment 3]
FIG. 7 is a cross-sectional view of end plate 80 of motor 1 according to Embodiment 3 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.

  In the first embodiment, the outer peripheral surface of the engaging portion 73 has a tapered surface 76 on the opposite side to the side where the stator 40 is located. In this embodiment, as shown in FIG. An edge on the side (output side L1) where the stator 40 is located on the inner peripheral surface of the opening 83 of the 80 is a tapered surface 86.

  According to such a configuration, the engaging portion 73 can be easily fitted into the opening 83, so that the bearing member 70 and the end plate 80 can be efficiently overlapped.

  In addition, when the convex part 834 is provided in the end plate 80 like Embodiment 2, the inner peripheral surface of the opening part 83 of the end plate 80 is the side where the stator 40 is located in the whole including the convex part 834 ( It is preferable that the edge of the output side L1) is a tapered surface 86.

[Other embodiments]
In the above embodiment, the end surface 49 of the stator 40 is configured by the annular portion 45 of the outer stator core 4B. However, the case member in which the end surface 49 of the stator 40 is disposed so as to overlap the annular portion 45 of the outer stator core 4B. The present invention may be applied to a case where

  In the above embodiment, the stepping motor is exemplified, but the present invention may be applied to a motor 1 other than the stepping motor. In the above embodiment, the end plate 80 is configured as an urging member including the leaf spring portion 85, but the end portion 52 of the rotating shaft 50 is supported without the leaf spring portion 85. In some cases, the present invention may be applied to the motor 1 configured such that the rotating shaft 50 is supported by the bearing member 70 in the thrust direction and the end plate 80 holds the bearing member 70 between the stator 40. Further, the width dimensions of the plurality of engaging portions 73 of the bearing member 70 are the same, and among the plurality of openings 83 of the end plate 80, the width dimension of one opening 83 is larger than the width dimensions of the other openings 83. Then, a narrowed configuration may be adopted. Further, the width dimension of the plurality of openings 83 of the end plate 80 is the same, and the width dimension of one engagement part 73 among the plurality of engagement parts 73 of the bearing member 70 is the width dimension of the other engagement part 73. You may employ | adopt the structure widened compared with.

DESCRIPTION OF SYMBOLS 1 Motor 2 Coil bobbin 4, 4A, 4B Outer stator core 5 Rotor 40 Stator 49 End surface 50 of a stator core Rotating shaft 70 Bearing member 73, 73a, 73b, 73c Engagement part 80 End plate 83, 83a, 83b, 83c Opening part 85 Plate spring Portions 731 and 732 Side surface portion 733 of engaging portion Tip portions 734 and 834 of engaging portion Protruding portions 831 and 832 Side surface portion 833 of opening portion

Claims (11)

A rotor with a rotation axis;
A stator disposed around the rotor;
A bearing member that rotatably supports the rotating shaft at one end of the stator in the motor axial direction;
An end plate that overlaps the bearing member from the opposite side of the stator and holds the bearing member between the stator and the end plate;
In a motor having
The bearing member includes engaging portions that overlap the end face of the stator at a plurality of locations in the circumferential direction,
The end plate includes openings in the circumferential direction at which the plurality of engaging portions are respectively fitted,
Positioning in the circumferential direction between the bearing member and the end plate is performed by the engagement portion and the opening at a predetermined one of the plurality of locations ,
A gap in the circumferential direction between the engaging portion and the opening at the predetermined one place is smaller than a gap between the engaging portion and the opening at other than the predetermined one place. motor.   An edge of the outer peripheral surface of the engaging portion opposite to the side where the stator is located, and at least one edge of the inner peripheral surface of the opening where the stator is located are tapered surfaces. The motor according to claim 1. Each of the plurality of engaging portions protrudes radially outward from the center side of the bearing member,
Positioning of the bearing member and the end plate in the circumferential direction is performed by a side surface portion extending radially outward in the engagement portion being in contact with an inner circumferential surface of the opening. The motor according to claim 1 or 2, characterized in that   Among the plurality of engagement portions and the plurality of openings, the engagement portion and the opening formed at the one place have a narrower width dimension in the circumferential direction than the other engagement portions and the openings. The motor according to claim 3. The end plate is an urging member including a leaf spring portion that urges the rotating shaft in the motor axial direction.
The said leaf | plate spring part is cut and raised so that the front-end | tip part may turn to the angle direction in which either of these engagement parts is located, The one of Claim 1 thru | or 4 characterized by the above-mentioned. The motor described.   A portion extending in the circumferential direction on the outer peripheral surface of the engaging portion and a portion extending in the circumferential direction on the inner peripheral surface of the opening portion are projected toward the other side portion on the other side. 6. The motor according to claim 1, wherein a convex portion that positions the bearing member and the end plate in a radial direction by contacting the portion is formed.   The motor according to claim 6, wherein the convex portion has a semicircular planar shape.   The motor according to claim 6 or 7, wherein the convex portion is formed on an outer peripheral surface of all the plurality of engaging portions or on an inner peripheral surface of all the plurality of openings. The engaging portion and the opening are substantially rectangular.
The said convex part is formed in the outermost part of the radial direction of the said engaging part, or the outermost part of the radial direction of the said opening part, The any one of Claims 6 thru | or 8 characterized by the above-mentioned. The motor described in. The convex portion is formed on the bearing member side,
10. The motor according to claim 6, wherein an edge of the outer peripheral surface of the convex portion opposite to the side where the stator is located is a tapered surface. The convex portion is formed on the end plate side,
The motor according to any one of claims 6 to 9, wherein an edge on a side where the stator is located on the outer peripheral surface of the convex portion is a tapered surface.

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