JP2011188626A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which hardly allows a biasing member to come off, and has superior vibration resistance and impact resistance. <P>SOLUTION: The motor 1 includes: a rotor 20 having a rotating shaft 22 and a permanent magnet 24 fixed on a peripheral surface of the shaft 22; and a stator 31 disposed around the rotor 20. The motor 1 also includes: a fixation body 30 having an engaging hole 38 formed on the exterior of the fixation body 30; a biasing member 42 for biasing the rotor 20 toward a front end in the axial direction, of the rotor 20; and a biasing member 40 having an engaging pawl 44 engaged to the engaging hole 38. Here, the biasing member 40 is attached to the fixation body 30 in such a manner that at least a part of the engaging pawl 44 is press-fitted in the engaging hole 38. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly to a motor provided with a biasing member that biases a rotating rotor toward the tip side.

  For example, in a motor as disclosed in Patent Document 1, the shaft end is biased in the axial direction by a biasing member. Patent Document 1 discloses a configuration in which the shaft end on the base end side (stator side) is urged toward the distal end side by an urging member attached to the end face of the stator. By urging the rotor in one direction in this way, rattling or tilting of the rotor during motor driving can be prevented.

  FIG. 13 is a one-side cross-sectional view for explaining a mounting structure of a biasing member in a conventional motor 100 such as the motor described in Patent Document 1 (hatching of a cross-sectional portion (below line Y for easy understanding) Is omitted). The urging member 101 has a bottom plate portion 102 formed with a leaf spring 106 that urges the rotor 110 toward the tip at the center, and an engaging claw portion 104 bent from the bottom plate portion 102. On the other hand, an engagement hole 122 of a predetermined size is formed in the outer wall (case 121) of the stator 120. The urging member 101 is attached so as to cover the end surface on the proximal end side of the cylindrical stator 120 by engaging the engagement claw 104 with the engagement hole 122.

  Specifically, the engagement claw 104 is engaged with the engagement hole 122 in the following configuration. As shown in the enlarged view of the Z part, a hooking part 108 bent radially inward is formed at the tip of the engaging claw part 104. The urging member 101 is attached to the stator 120 by the hooking portion 108 being hooked on the proximal end surface 122 a of the engagement hole 122.

JP 2007-20346 A

  However, in the motor 100 to which the urging member is attached in this way, if a large force is applied to the rotor 110 due to vibration or impact, the attachment attached to the stator 120 is applied. The urging member 101 may come off. This is because the large load transmitted to the biasing member 101 may not be supported only by the hooking portion 108 hooked in the engagement hole 122.

  In view of the above circumstances, the problem to be solved by the present invention is to provide a motor excellent in vibration resistance and impact resistance in which a biasing member that biases the rotor toward the tip side is difficult to come off.

  In order to solve the above problems, the present invention includes a rotor having a rotating shaft and a permanent magnet fixed to the peripheral surface thereof, a stator disposed around the rotor, and an engagement hole on the outside. A fixed body formed, a base plate that abuts on a base end side end surface of the fixed body, an urging portion that is cut and raised from the base plate toward the distal end side in the axial direction, and biases the rotor toward the distal end side in the axial direction; A biasing member that has an engagement claw portion bent from the base plate toward the distal end side and engaged with the engagement hole, wherein the biasing member is at least a part of the engagement claw portion. Is attached to the fixed body in a state of being press-fitted into the engagement hole.

  According to the motor of the present invention, the urging member that urges the rotor toward the distal end side is fixed in a state where at least a part of the engaging claw portion of the urging member is press-fitted into the engaging hole. The biasing member is difficult to come off. Therefore, a motor excellent in vibration resistance, impact resistance and the like can be obtained.

  Further, according to the present invention, the engagement claw portion includes: a main body portion formed along an outer surface of the fixed body; and a press-fit portion formed at a distal end of the main body portion and press-fitted into the engagement hole. It is preferable to provide.

  Further, according to the present invention, the inner surface of the engagement hole includes at least a first support surface perpendicular to the axis of the rotor and two side surfaces that intersect the first support surface and face each other. The press-fitting portion is formed by bending from the main body portion inward in the radial direction of the rotor, the first press-contact portion press-contacted to the first support surface, and the first press-contact portion from the first press-contact portion. It is preferable to have a sandwiched portion that is bent in the axial direction of the rotor and is sandwiched between the two side surfaces.

  As described above, the first pressure contact portion is pressed against the first support surface constituting the inner surface of the engagement hole, and the sandwiched portion is sandwiched between the first support surface and the second support surface. As a result, the press-fit portion is unlikely to come off from the engagement hole.

  In the present invention, it is preferable that at least one of the front end of the sandwiched portion and the second support surface is formed with a notched portion in which a part thereof is notched.

  In this way, at least one of the front end of the sandwiched portion and the second support surface is cut away, and the contact area between the sandwiched portion and the second support surface is reduced, so that the engagement hole is sandwiched. The resistance (friction resistance) at the time of press-fitting the portion (press-fit portion) can be appropriately adjusted (the ease of press-fitting of the sandwiched portion (press-fit portion) can be appropriately adjusted) so that the press-fitting work can be easily performed.

  Furthermore, the present invention is further configured to be bent from the sandwiched portion to the outer side in the radial direction of the rotor so as to face the first press contact portion, and press-contacted to the second support surface. It is preferable to have a pressure contact part.

  In this way, the second press-contact portion that is press-contacted to the second support surface is provided, and the press-fitting portion of the urging member that has a substantially U-shaped cross section (a cross section cut along a plane parallel to the axis of the rotor) If it is set as the structure press-fitted in the engagement hole, the detachment of the press-fit portion from the engagement hole is surely prevented.

  Furthermore, in the present invention, it is preferable that an end portion of the second pressure contact portion bends toward the tip side and abuts on an outer surface of the fixed body.

  If comprised in this way, when the press-fit part is press-fitted into the engagement hole, the bent part functions as a stopper, so that the press-fit part is not pushed too much. That is, the operator who performs the attaching work of the urging member does not need to adjust the press-fitting amount by adjusting the force, and the press-fitting work becomes easy.

  Further, according to the present invention, two side surfaces intersecting the first support surface and the second support surface are formed on the inner surface of the engagement hole, and the two side surfaces and the sandwiched portion are separated from each other. It is preferable to be in the state.

  If comprised in this way, since it becomes the structure by which the to-be-clamped part (press-fit part) was clamped only between the 1st support surface which is an inner surface of an engagement hole, and a 2nd support surface, The resistance (friction resistance) at the time of press-fitting (press-fit portion) does not become too large, and the press-fitting work of the sandwiched portion (press-fit portion) becomes easy.

  On the other hand, in the above-mentioned present invention, the inner surface of the engagement hole includes at least a first support surface perpendicular to the axis of the rotor, two side surfaces intersecting the first support surface and facing each other, The press-fitting portion is formed by bending from the main body portion inward in the radial direction of the rotor, and a first press-contact portion press-contacted to the first support surface, and the first press-contact portion. It is good also as a structure which bends in the axial direction of the said rotor, and has a to-be-clamped part clamped between the said 2 side surfaces.

  As described above, when the first pressure contact portion is pressed against the first support surface constituting the inner surface of the engagement hole and the sandwiched portion is sandwiched between the two side surfaces, press-fitting from the engagement hole is possible. The part becomes difficult to come off.

  In the present invention, it is preferable that at least one of both ends of the sandwiched portion and the two side surfaces is formed with a notched portion in which a part thereof is notched.

  In this way, by sandwiching at least one of the tip of the sandwiched portion and the two side surfaces and reducing the contact area between the sandwiched portion and the two side surfaces, the sandwiched portion (press-fit portion) ) Can be adjusted as appropriate so as to facilitate the press-fitting operation (adjustability of press-fitting of the sandwiched portion (press-fit portion) is adjusted as appropriate).

  In the invention, it is preferable that the press-fitting portion further includes a second press-contact portion that is formed by bending from the sandwiched portion outward in the radial direction of the rotor and press-contacted to each of the two side surfaces. Is preferred.

  If comprised in this way, the 2nd press-contact part press-contacted to two side surfaces will be provided, and the cross-section (cross section cut | disconnected by the plane perpendicular | vertical to the axis line of a rotor) of the energizing member used as a substantially "U" shape If the press-fit portion is press-fitted into the engagement hole, the press-fit portion from the engagement hole is reliably prevented from coming off.

  Furthermore, in the present invention, it is preferable that an end portion of the second pressure contact portion bends toward the tip side and abuts on an outer surface of the fixed body.

  If comprised in this way, when the press-fit part is press-fitted into the engagement hole, the bent part functions as a stopper, so that the press-fit part is not pushed too much. That is, the operator who performs the attaching work of the urging member does not need to adjust the press-fitting amount by adjusting the force, and the press-fitting work becomes easy.

  Further, according to the present invention, a second support surface facing the first support surface is formed on the inner surface of the engagement hole, and the second support surface and the sandwiched portion are separated from each other. Preferably there is.

  If comprised in this way, since it becomes the structure by which the to-be-clamped part (press-fit part) was clamped only between the two side surfaces which are the inner surfaces of an engagement hole, when press-fitting a to-be-clamped part (press-fit part) The resistance (friction resistance) does not increase too much, and the press-fitting work becomes easy.

  In the present invention, it is preferable that the engagement hole is formed in a motor case that covers the stator.

  A reaction force of the urging force is applied to the urging member that urges the rotating shaft. Therefore, a motor case that constitutes a main body portion of the motor is most suitable as a member that supports the reaction force.

  In the present invention, it is preferable that the sandwiched portion does not protrude into the stator.

  If comprised in this way, since the to-be-clamped part does not have a possibility of contacting with the drive coil etc. which are provided in the inside of a stator, generation | occurrence | production of malfunction inside a stator, such as a disconnection of a drive coil, is prevented.

  According to the present invention, since at least a part of the engaging claw portion of the urging member is press-fitted into the engagement hole formed in the fixed body made of the stator or the like, the urging force is applied from the fixed body. The member is difficult to come off. Therefore, a motor having excellent vibration resistance and impact resistance can be obtained.

It is a half sectional view in the longitudinal direction of the motor concerning one embodiment of the present invention. It is the perspective view which decomposed | disassembled and showed the principal part of the motor shown in FIG. It is the figure which expanded and showed the engagement hole vicinity formed in the motor case of the motor (motor concerning 1st embodiment) shown in FIG. It is the figure which showed the structure for making the contact area of a to-be-clamped part and a 2nd support surface small. It is the figure which showed the attachment (press-fit) procedure of the press-fit part (clamped part) with respect to an engagement hole. It is the figure which expanded and showed the engagement hole vicinity formed in the motor case of the motor concerning the modification 1-1. It is the figure which expanded and showed the engagement hole vicinity formed in the motor case of the motor concerning the modification 1-2. It is the figure which expanded and showed the engagement hole vicinity formed in the motor case of the motor concerning 2nd embodiment. It is the figure which showed the structure for reducing the contact area of a to-be-clamped part and two side surfaces. It is the figure which expanded and showed the engagement hole vicinity formed in the motor case of the motor concerning the modification 2-1. It is the figure which expanded and showed the engagement hole vicinity formed in the motor case of the motor concerning the modification 2-2. It is the figure which showed roughly an example about the position in which an engagement hole is formed. It is sectional drawing for demonstrating the attachment structure of the biasing member in the conventional motor.

<First embodiment>
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a motor according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a half sectional view in the longitudinal direction of the motor 1 according to the first embodiment of the present invention (for easy understanding of the drawing, the hatching of the cross section (below the line X) is omitted). In the following description, the left side in FIG. 1 is referred to as the distal end side, and the right side is referred to as the proximal end side. That is, the side of the rotating shaft 22 where the lead screw 22a is formed is referred to as the distal end side, and the side where the fixed body 30 is fixed is referred to as the proximal end side. Further, the “axis” simply refers to the axis X of the rotor 20. FIG. 2 is an exploded perspective view showing a main part of the motor 1. 3 is an enlarged view of the vicinity of the engagement hole 38 formed in the motor case 37, FIG. 3 (a) is an enlarged view of a portion A shown in FIG. 1, and FIG. 3 (b) is FIG. FIG. 3B is a perspective view of the engagement hole 38 as seen from the proximal end side.

  The motor 1 according to the present embodiment is a stepping motor. The motor 1 includes a rotor 20, a fixed body 30 having a stator 31 provided around (a base end side) around the rotor 20, and a biasing member 40 that biases the rotor 20 toward the distal end side.

  In the present embodiment, the rotor 20 refers to a configuration that rotates when the motor 1 is driven. The rotor 20 has a rotating shaft 22 and a permanent magnet 24. Specifically, a permanent magnet 24 in which N poles and S poles are alternately magnetized in the circumferential direction is fixed to the outer peripheral surface on the proximal end side of the rotating shaft 22. The rotating shaft 22 has a lead screw 22a formed on the outer peripheral surface thereof (a portion protruding from the stator 31) (excluding the tip end side shaft end 221). The rotary shaft 22 has a distal end side shaft end 221 supported by a distal end side bearing 54 attached to the frame 50, and a proximal end side shaft end 222 supported by a proximal end side bearing 56 attached to the bearing holding member 52. Yes.

  In the present embodiment, the fixed body 30 refers to a portion that does not move even when the motor 1 is driven, and has at least a stator 31. In addition to the stator 31, the fixed body 30 includes a frame 50 fixed to the front end surface of the stator 31, a bearing holding member 52 fixed to the base end surface of the stator 31, a front end side bearing 54 attached to the frame 50, and a bearing holding A proximal end bearing 56 is attached to the member 52.

  The stator 31 is composed of two stator sets that are arranged so as to overlap the permanent magnet 24 on the outer peripheral side in the axial direction of the rotary shaft 22. Each of the stator sets includes an inner stator core 311, a drive coil 313 wound around a coil bobbin 313 a, and an outer stator core 312 that sandwiches the drive coil 313 between the inner stator core 311.

  Each of the inner stator core 311 and the outer stator core 312 is formed with a plurality of pole teeth 36 erected in the axial direction at equal intervals on the inner peripheral edge thereof. Specifically, the pole teeth 36 formed on the inner stator core 311 are configured to interleave with the pole teeth 36 formed on the outer stator core 312. An annular drive coil 313 is arranged on the outer periphery of the pole teeth 36 in the inner stator core 311 and the outer stator core 312 that are configured to interleave in this way via a coil bobbin 313a.

  Further, the outer peripheral edge of the outer stator core 312 on the front end side is bent up so as to cover the outer periphery of the drive coil 313, and functions as a motor case 37. The motor case 37 is formed in a cylindrical shape by drawing. An engagement hole 38 having a predetermined size is formed on the outer surface of the cylindrical shape. As shown in FIG. 3, the engagement hole 38 is a through hole formed in a substantially rectangular shape in plan view. The urging member 40 is attached to the stator 31 constituting the fixed body 30 using the engagement hole 38. A specific configuration of the engagement hole 38 and a mounting structure of the urging member 40 will be described later. Further, two positioning holes 39 for positioning the bearing holding member 52 are formed in the base end side end surface of the stator 31 (outer stator core 321 on the base end side).

  The stator 31 is provided with a terminal block 58 that protrudes from the outer surface of the motor case 37. A plurality of terminal pins 581 for power supply are erected on the terminal block 58, and winding terminals of the drive coil 313 are entangled.

  The frame 50 fixed to the end surface on the front end side of the stator 31 is a member formed in a substantially “U” shape by bending both ends of a metal plate at a substantially right angle. A distal end side bearing 54 that is a radial bearing is fixed to the distal end of the frame 50. The distal end side bearing 54 rotatably supports the distal end side shaft end 221 of the rotating shaft 22 via a steel ball 542 held in the recess 541.

  A bearing holding member 52 is fixed to the base end surface of the stator 31. The bearing holding member 52 is a resin molded product, and the planar shape thereof is a shape obtained by cutting out four corners of a rectangular plate into an arc shape. The bearing holding member 52 is formed with an annular protrusion 521 that protrudes from the center toward the distal end, and two positioning protrusions 522 that protrude toward the distal end so as to sandwich the annular protrusion 521. As shown in FIG. 2, the annular protrusion 521 is engaged with the inner periphery of the pole tooth 36 of the stator 31, and the positioning protrusion 522 is engaged with a positioning hole 39 formed on the base end side end surface of the stator 31. The holding member 52 is positioned with respect to the stator 31.

  A through hole 52 a into which the base end side bearing 56 is inserted is formed in the approximate center of the bearing holding member 52. The base end side bearing 56 is arranged in a state in which it can move in the axial direction in the through hole 52a. The proximal end bearing 56 is formed in a cylindrical shape with a flat end surface on the proximal end side. The base end side bearing 56 rotatably supports the base end side shaft end 222 of the rotary shaft 22 via a steel ball 562 held in the recess 561.

  The proximal end side bearing 56 is urged toward the distal end side by the urging member 40 attached to the fixed body 30. That is, when the proximal end bearing 56 is biased toward the distal end side, the rotary shaft 22, that is, the rotor 20 supported by the proximal end bearing 56 is biased toward the distal end side. In this way, the rotor 20 is supported so as to be sandwiched between the distal end side bearing 54 and the proximal end side bearing 56. Thereby, rattling and tilting of the rotating rotor 20 are prevented. Hereinafter, the structure of the urging member 40 and the structure for attaching the urging member 40 to the stator 31 constituting the fixed body 30 will be described in detail.

  The urging member 40 is a press-worked product formed of a thin metal plate such as stainless steel that can be elastically deformed. The urging member 40 has a shape similar to that of the bearing holding member 52 in which four corners of a rectangular plate are cut out into an arc shape. The base plate 41 having the urging member 42 abutting against the flat proximal end surface of the proximal end bearing 56 and urging the rotor 20 toward the distal end, and the urging member 40 to the fixed body 30 (stator 31). It has two engaging claws 44 for attachment. The urging portion 42 is a so-called leaf spring that is formed by cutting and raising a substantially central portion of the base plate 41 that abuts the proximal end surface of the stator 31. The urging portion 42 is cut and raised so as to protrude from the base plate 41 toward the distal end side (side on which the bearing holding member 52 is located).

  The engagement claw portion 44 is formed so as to bend substantially in the axial direction from the approximate center of the two short sides of the base plate 41 and to face each other with the urging portion 42 interposed therebetween. That is, the urging member 40 is attached to the stator 31 using the engagement claw portion 44. The engagement claw portion 44 has a main body portion 441 and a press-fit portion 442.

  The main exterior 441 is a portion formed from the base plate 41 along the outer peripheral surface of the stator 31 (fixed body 30). The length in the axial direction is approximately equal to the length from the proximal end surface of the stator 31 to the engagement hole 38.

  A press-fit portion 442 is formed at the tip of the main body portion 441. As shown in FIGS. 2 and 3, the press-fit portion 442 includes a press-contact portion (first press-contact portion) 442 a and a sandwiched portion 442 b. Specifically, the pressure contact portion 442a is a portion that is bent inward in the radial direction of the rotor 20 from the front end of the main body portion 441, and is substantially parallel to the base plate 41. The sandwiched portion 442b is a portion of the pressure contact portion 442a. It is a portion formed by bending in the axial direction from the tip. The axial length of the press contact portion 442a is formed to be slightly larger than the axial length of the engagement hole 38 (interval between a first support surface 381 and a second support surface 382 described later). .

  On the other hand, the engagement hole 38 is a hole formed in a substantially rectangular shape in plan view formed by press punching. A first support surface 381 perpendicular to the axis of the rotor 20 and a second support surface 382 facing the first support surface 381 are formed on the inner surface. That is, the first support surface 381 and the second support surface 382 are formed in the thickness direction of the motor case 37. Note that the second support surface 382 is located on the tip side of the first support surface 381.

  The biasing member 40 is attached to the stator 31 (fixed body 30) using the engagement hole 38 as follows. First, the base plate 41 of the urging member 40 is in close contact with the proximal end surface of the fixed body 30, that is, the proximal end surface of the bearing holding member 52 in this embodiment. Therefore, the urging portion 42 is in contact with the base end side bearing 56 with elasticity. On the other hand, the press-fit portion 442 of the engagement claw portion 44 is press-fitted into the engagement hole 38. Specifically, the press contact portion 442 a formed substantially parallel to the base plate 41 is hooked on the first support surface 381 of the engagement hole 38. Since the urging portion 42 is in elastic contact with the base end side bearing 56, a reaction force of the urging force is applied to the entire urging member 40, and the pressure contact portion 442 a is in pressure contact with the first support surface 381. In this state, the pressure contact portion 442a is in contact with the first support surface 381 with a predetermined pressing force. Hereinafter, “pressure contact” refers to such a state. Further, the sandwiched portion 442b is formed such that its axial length is slightly larger than the axial length of the engagement hole 38, so that the tip of the sandwiched portion 442b contacts the second support surface 382. Yes. That is, the sandwiched portion 442b is in a state of being sandwiched (in other words, press-fitted) between the first support surface 381 and the second support surface 382.

  As described above, the urging member 40 is attached to the stator 31 with the press-fit portion 442 formed at the tip of the engagement claw portion 44 being press-fitted and fixed in the engagement hole 38 formed in the stator 31. It has been. Specifically, the pressed portion 442a is pressed against the first support surface 381, and the sandwiched portion 442b is held between the first support surface 381 and the second support surface 382. The press-fit strength of the press-fit portion 442 with respect to the engagement hole 38 is high, and the urging member 40 is unlikely to come off from the fixed body 30. Therefore, it can be set as the motor 1 excellent in vibration resistance and vibration resistance.

  Here, when the resistance at the time of press-fitting of the press-fit portion 442 (the sandwiched portion 442b) is too large, the press-fit portion 442 may not be press-fit or the engagement hole 38 (motor case 37) may be deformed. Therefore, by adopting the configuration shown in FIG. 4, the resistance (friction resistance) at the time of press-fitting may be adjusted as appropriate.

  FIG. 4 is a plan view of the engagement hole 38 for explaining such a configuration (corresponding to FIG. 3B). As shown in FIG. 4A, the contact area between the sandwiched portion 442b and the second support surface 382 may be reduced by notching part of the tip portion of the sandwiched portion 442b (notched portion 451). . As a result, the frictional resistance between the sandwiched portion 442b and the engagement hole 38 is reduced, so that the press-fit portion 442 is easily press-fitted into the engagement hole 38. On the other hand, as shown in FIG. 4B, a notch (notch 452) for reducing the contact area with the sandwiched portion 442b may be formed on the second support surface 382 as shown in FIG. Good. Further, notches may be formed in both the sandwiched portion 442b and the second support surface 382. Note that the size of the notch may be adjusted as appropriate, but the left and right sides of the straight line that bisects the sandwiched portion 442b in the width direction are symmetrical so that the frictional resistance against the press-fit portion 443 is not biased. It is better to make a notch.

  Further, as can be seen from FIG. 3, the sandwiched portion 442b is separated from the two side surfaces 383 constituting the inner surface of the engagement hole 38 (the surface intersecting the first support surface 381 and the second support surface 382). It is formed to such a width. That is, there is a gap C between the sandwiched portion 442b and the two side surfaces 383. This is because when the sandwiched portion 442 b is configured to be sandwiched not only between the first support surface 381 and the second support surface 382 but also between the two side surfaces 383, the engagement hole 38. This is because the resistance (friction resistance) at the time of press-fitting of the sandwiched portion 442b (press-fit portion 442) into the head becomes too large. That is, the sandwiched portion 442b (press-fit portion 442) is configured to be sandwiched only between the first support surface 381 and the second support surface 382, so that the resistance during press-fit becomes appropriate. The press-fitting work becomes easy. In the present embodiment, the pressure contact portion 442a is also separated from the two side surfaces 383.

  3A, the sandwiched portion 442b sandwiched between the first support surface 381 and the second support surface 382 protrudes into the stator 31 (inside the engagement hole 38). It does not protrude from the open end. Therefore, the pinched portion 442b prevents the occurrence of problems such as disconnection of the drive coil 313 housed inside the stator 31.

  On the other hand, in order to facilitate the press-fitting work of the press-fitting portion 442 into the engagement hole 38, when the urging member 40 is processed, the angle formed by the press-contact portion 442a and the sandwiched portion 442b is an acute angle (for example, about 45 degrees). (The shape of the press-fit portion 442 may be formed in a substantially “<” shape). In this way, the press-fit portion 442 can be press-fitted into the engagement hole 38 in the order shown in FIG. That is, first, as shown by the dotted line in FIG. 5, the pressure contact portion 442 a is hooked on the first support surface 381, and then the sandwiched portion 442 b is placed on the radially inner side of the rotor 20 as shown by the solid line in FIG. 5. By pushing in toward, the sandwiched portion 442b can be sandwiched between the first support surface 381 and the second support surface 382. That is, the operation of engaging the press-fit portion 442 with the engagement hole 38 (operation of hooking the press-contact portion 442a on the first support surface 381) can be facilitated.

  Hereinafter, modified examples of the motor 1 according to the first embodiment will be described. In the following modification, only the configuration of the press-fitting portion 442 of the engaging claw portion 44 in the urging member 40 is different, and the other configurations are the same as those of the motor 1 according to the first embodiment. Therefore, the same components are denoted by the same reference numerals, and description thereof is omitted. Note that enlarged views (FIGS. 6 and 7) for explaining the respective modified examples show the vicinity of the engagement hole 38 formed in the stator 31 in an enlarged manner, and the motor 1 according to the first embodiment described above. This corresponds to FIG. 3 shown as an explanatory diagram.

(Modification 1-1)
As shown in FIG. 6, the press-fitting portion 442 of the motor according to the modified example 1-1 is formed by bending from the main body portion 441 to the inner side in the radial direction of the rotor 20, similarly to the motor 1 according to the first embodiment. The first pressure contact portion 442a and the sandwiched portion 442b formed by bending in the axial direction from the first pressure contact portion 442a.

  In addition, the press-fitting portion 442 of the motor according to the present modification includes a second press-contact portion 442c formed by bending outward from the sandwiched portion 442b in the radial direction of the rotor 20. That is, the press-fit portion 442 has a substantially “U” -shaped cross section. Note that when the urging member 40 is processed, the angle formed between the second pressure contact portion 442c and the sandwiched portion 442b is formed to be slightly larger than 90 degrees. That is, the distance between the first pressure contact portion 442a and the second pressure contact portion 442c is formed so as to gradually increase toward the radially outer side of the rotor 20.

  When the press-fit portion 442 formed in this way is engaged with the engagement hole 38, the second press-contact portion 442 c is in a state of being press-contacted with the second support surface 382 of the engagement hole 38. In other words, the first support surface 381 and the second support are in a state where the first press contact portion 442a is press contacted to the first support surface 381 and the second press contact portion 442c is press contacted to the second support surface 382. The sandwiched portion 442b is sandwiched between the surface 382 and the surface 382. Thus, in this modification, since the press-fit portion 442 is more firmly press-fitted into the engagement hole 38, the urging member 40 attached to the stator 31 is less likely to come off.

(Modification 1-2)
As illustrated in FIG. 7, the press-fit portion 442 of the motor according to the modified example 1-2 includes a first press-contact portion 442a and a sandwiched portion 442b, similarly to the motor 1 according to the first embodiment. In addition, like the motor according to the modified example 1-1, the second pressure contact portion 442c is provided. The end of the second pressure contact portion 442c is bent toward the tip end side in the axial direction (parallel to the sandwiched portion 442b) (bent portion 442d). The bent portion 442d is in contact with the outer peripheral surface of the motor case 37 (engaged with the opening edge of the engagement hole 38).

  In this way, if the end portion of the second press contact portion 442c is bent toward the distal end side in the axial direction, the bent portion 442d functions as a stopper. Therefore, when the press fit portion 442 is press fitted into the engagement hole 38, the press fit portion 442 is not pushed too much. That is, since it is not necessary to adjust the press-fitting amount by adjusting the force, the press-fitting work is facilitated. Even if an external force is applied radially inward to the press-fit portion 442 (particularly the sandwiched portion 442b), the bent portion 442b is in contact with the outer peripheral surface of the motor case 37, so that the sandwiched portion 442b is It does not protrude into the stator 31 (projects from the inner opening end of the engagement hole 38). Therefore, the pinched portion 442b prevents the occurrence of problems such as disconnection of the drive coil 313 housed inside the stator 31. Furthermore, rattling of the press-fit portion 442 press-fitted into the engagement hole 38 is reduced, and the press-fit portion 442 is less likely to come off from the engagement hole 38.

  In the modified examples 1-1 and 1-2, the sandwiched portion 442b and the second pressure contact portion 442c may be partially cut out, or the second support surface 382 may be cut out. That is, a configuration in which the contact area between the sandwiched portion 442b or the second press contact portion 442c and the second support surface 383 may be adopted so that the press fit portion 442 can be easily press-fitted into the engagement hole 38.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. The motor 2 according to the second embodiment is different from the motor 1 according to the first embodiment in the configuration of the press-fit portion 443. Other configurations are the same as those of the motor 1 according to the first embodiment. Therefore, components other than the press-fitting portion 443 are denoted by the same reference numerals and description thereof is omitted. FIG. 8 is an enlarged view showing the vicinity of the engagement hole 38 formed in the motor case 37, and corresponds to FIG. 3 for explaining the first embodiment.

  The press-fit portion 443 of the motor 2 includes a press-contact portion (first press-contact portion) 443a and a sandwiched portion 443b. The pressure contact portion 443a is a portion formed by bending the tip end of the main body portion 441 inward in the radial direction of the rotor 20, and such a configuration is the same as the pressure contact portion (first pressure contact portion) 442a in the first embodiment. is there.

  On the other hand, the sandwiched portion 443b is a portion formed by bending in the axial direction from the press contact portion 443a. The width of the sandwiched portion 443b (the length in the direction orthogonal to the axial direction) is formed to be slightly larger than the distance between the two side surfaces 383 of the engagement hole 38.

  The press-fitting portion 443 is press-fitted into the engagement hole 38 as follows. First, the base plate 41 of the biasing member 40 is in close contact with the proximal end surface of the stator 31. Therefore, the urging portion 42 is in contact with the base end side bearing 56 with elasticity. The press contact portion 443 a formed substantially parallel to the base plate 41 is hooked on the first support surface 381 of the engagement hole 38. Since the urging portion 42 is in a state of elastically contacting the proximal end side bearing 56, a reaction force of the urging force is applied to the entire urging member 40, and the pressure contact portion 443 a is applied to the first support surface 381. It is in a pressed state. Further, since the sandwiched portion 443b has a width that is slightly larger than the interval between the two side surfaces 383 of the engagement hole 38, it is sandwiched between the two side surfaces 383 (in other words, press-fitted). ) State. That is, in the second embodiment, the sandwiched portion 443b is sandwiched between the two side surfaces 383 of the engagement hole 38, so that the sandwiched portion 442b is the first support surface 381 and the second support surface. It differs from 1st embodiment pinched between 382.

  As described above, the urging member 40 is attached to the stator 31 with the press-fit portion 443 formed at the tip of the engagement claw portion 44 being press-fitted and fixed in the engagement hole 38 formed in the stator 31. ing. Specifically, since the pressed portion 443a is pressed against the first support surface 381, and the clamped portion 443b is held between the two side surfaces 383, the press-fit portion 443 is pressed into the engagement hole 38. The strength is high, and the urging member 40 is difficult to come off from the fixed body 30. Therefore, it can be set as the motor 1 excellent in vibration resistance and vibration resistance.

  In this embodiment, of the press-fit portion 443, the press-contact portion 443a is in contact with the first support surface, and the sandwiched portion 443b is in contact with the two side surfaces 383. In other words, since the press-fit portion 443 is in contact with the three inner surfaces of the engagement hole 38, a more stable press-fit state can be obtained.

  Here, when the resistance at the time of press-fitting of the press-fit portion 443 (the sandwiched portion 443b) is too large, the press-fit portion 443 may not be press-fit or the engagement hole 38 (motor case 37) may be deformed. Therefore, by adopting the configuration shown in FIG. 9, the resistance (friction resistance) at the time of press-fitting may be adjusted as appropriate.

  FIG. 9 is a plan view of the engagement hole 38 for explaining such a configuration (corresponding to FIG. 8B). As shown in FIG. 9A, the contact area between the sandwiched portion 443b and the two side surfaces 383 may be reduced by notching part of both ends of the sandwiched portion 443b (notched portion 453). As a result, the frictional resistance between the sandwiched portion 443b and the engagement hole 38 is reduced, so that the press-fit portion 443 is easily press-fitted into the engagement hole 38. On the other hand, as shown in FIG. 9B, a notch (notch 454) may be formed on the two side surfaces 383 for reducing the contact area with the sandwiched portion 443b. Further, notches may be formed on both the sandwiched portion 443b and the two side surfaces 383. Note that the size of the notch may be adjusted as appropriate, but it is symmetrical with respect to a straight line that bisects the sandwiched portion 443b in the length direction so that the frictional resistance against the press-fit portion 443 is not biased. It is better to form a notch in

  Further, as can be seen from FIG. 8B, the axial length of the sandwiched portion 443b is formed so as not to contact the second support surface 382 that constitutes the inner surface of the engagement hole 38. Yes. That is, a gap C exists between the sandwiched portion 443b and the second support surface 382. This is because the sandwiched portion 443b is sandwiched not only between the two side surfaces 383 of the engagement hole 38 but also between the first support surface 381 and the second support surface 382. This is because the resistance (friction resistance) at the time of press-fitting the clamped portion 443b (press-fit portion 443) into the engagement hole 38 becomes too large. That is, by adopting a configuration in which the sandwiched portion 443b (press-fit portion 443) is sandwiched only between the two side surfaces 383, resistance during press-fit becomes appropriate, and the press-fit operation becomes easy.

  8A, the sandwiched portion 443b sandwiched between the first support surface 381 and the second support surface 382 protrudes into the stator 31 (inside the engagement hole 38). It does not protrude from the open end. Therefore, occurrence of problems such as disconnection of the drive coil 313 housed in the stator 31 is prevented by the sandwiched portion 443b.

  Hereinafter, modifications of the motor 2 according to the second embodiment will be described. In the following modification, only the configuration of the press-fit portion 443 of the engaging claw portion 44 in the urging member 40 is different, and the other configurations are the same as those of the motor 2 according to the first embodiment. Therefore, the same components are denoted by the same reference numerals, and description thereof is omitted. In addition, the figure (FIG. 10, FIG. 11) which showed each modification is equivalent to FIG.8 (c) which is explanatory drawing of the motor 2 concerning said 2nd embodiment.

(Modification 2-1)
As shown in FIG. 10, the press-fit portion 443 of the motor according to the modified example 2-1 is formed by bending from the main body portion 441 to the inner side in the radial direction of the rotor 20, similarly to the motor 1 according to the first embodiment. The first press contact portion 443a and the sandwiched portion 443b formed by bending in the axial direction from the first press contact portion 443a.

  In addition to this, the press-fit portion 443 of the motor according to the present modification has two second press-contact portions 443c formed by bending outward from the sandwiched portion 443b in the radial direction of the rotor 20. That is, the press-fitting portion 443 has a substantially U-shaped cross section (cross section cut along a plane orthogonal to the axis). Note that when the urging member 40 is processed, the angle formed between each of the second press contact portions 443c and the sandwiched portion 443b is formed to be slightly larger than 90 degrees. That is, the interval between the second press contact portions 443 c is formed so as to gradually increase toward the radially outer side of the rotor 20.

  When the press-fit portion 443 formed in this way is engaged with the engagement hole 38, the second press-contact portion 443 c is in a state of being press-contacted with the side surface 383 of the engagement hole 38. That is, the sandwiched portion 443b is sandwiched between the side surfaces 383 in a state where the second press contact portions 443c are pressed against the side surfaces 383. Thus, in this modification, since the press-fit portion 443 is more firmly press-fitted into the engagement hole 38, the urging member 40 attached to the stator 31 is less likely to come off.

(Modification 2-2)
As illustrated in FIG. 11, the press-fit portion 443 of the motor according to the modified example 2-2 includes a first press-contact portion 443a and a sandwiched portion 443b, similarly to the motor 2 according to the second embodiment. In addition, like the motor according to the modified example 2-1, it has two second press contact portions 443c. However, the end of the second pressure contact portion 443c is bent outward (in parallel with the sandwiched portion 443b) of the rotor 20 (bent portion 443d). The bent portion 443d is in contact with the outer peripheral surface of the motor case 37 (engaged with the opening edge of the engagement hole 38).

  In this way, if the end of the second press contact portion 443 is bent outward in the circumferential direction of the rotor 20, the bent portion 443 d functions as a stopper. Therefore, when the press fit portion 443 is press fitted into the engagement hole 38. The press-fitting portion 443 is not pushed too much. That is, since it is not necessary to adjust the press-fitting amount by adjusting the force, the press-fitting work is facilitated. Even if an external force is applied to the press-fit portion 443 (particularly the sandwiched portion 443b) inward in the radial direction, the bent portion 443d is in contact with the outer peripheral surface of the motor case 37. It does not protrude into the stator 31 (projects from the inner opening end of the engagement hole 38). Therefore, the occurrence of problems such as the drive coil 313 being disconnected by the sandwiched portion 443b is prevented. Furthermore, rattling of the press-fit portion 443 press-fitted into the engagement hole 38 is reduced, and the press-fit portion 443 is less likely to come off from the engagement hole 38.

  In the above-described modified examples 2-1 and 2-2, the sandwiched portion 443b and the second press-contact portion 443c may be partially cut out, or the two side surfaces 383 may be partially cut out. That is, a configuration in which the contact area between the sandwiched portion 443b or the second press contact portion 443c and the second support surface 383 may be adopted so that the press fit portion 443 can be easily press-fitted into the engagement hole 38.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, it has been described that the engagement hole 38 is formed in the motor case 37. However, the engagement hole 38 may be formed in the fixed body 30 that does not rotate even when the motor is driven. The position is not particularly limited. For example, as schematically shown in FIG. 12, a bearing holding member 63 is provided so as to protrude from the base end side end surface 601 of the stator 60, and the base end side bearing 62 that supports the rotating shaft 61 is held by the bearing holding member 63. In this case, the space generated between the stator 60 and the bearing holding member 63 may be used as the engagement hole 65 for attaching the biasing member 64.

  In the present embodiment, it has been described that the urging member 40 has the two engaging claws 44 formed to face each other, but two or more may be provided. For example, the four engaging claws 44 may be formed so as to protrude from the center of each side of the base plate 41.

  Further, in the present embodiment, it has been described that the engagement hole 38 is a through hole formed in the motor case 37, but a recess having a predetermined depth (depth at which the press-fit portions 442 and 443 can be press-fitted) ( A recess). In this way, the press-fit portions 442 and 443 do not enter the stator 31, and disconnection of the drive coil 313 is prevented.

DESCRIPTION OF SYMBOLS 1 Motor 20 Rotor 22 Rotating shaft 24 Permanent magnet 30 Fixed body 31 Stator 37 Motor case 38 Engagement hole 381 First support surface 382 Second support surface 383 Side surface 40 Energizing member 42 Energizing part 44 Engaging claw part 441 Main body part 442 Press-fit part (first embodiment)
442a First press contact portion 442b Clamped portion 442c Second press contact portion 442d Bend portion 443 Press fit portion (second embodiment)
443a First press contact portion 443b Clamped portion 443c Second press contact portion 444d Bending portion 444 Press fit portion (third embodiment)
444a Pressure contact portion 444b Insertion portion 451-454 Notch

Claims (14)

A rotor having a rotating shaft and a permanent magnet fixed to the circumferential surface thereof;
A stationary body having a stator disposed around the rotor and having an engagement hole formed on the outside;
A base plate that abuts on the base end side end surface of the fixed body, an urging portion that is cut and raised from the base plate toward the distal end side in the axial direction, and biases the rotor toward the distal end side in the axial direction, and from the base plate to the distal end side An urging member having an engaging claw that is bent and engaged with the engaging hole;
In motors with
The motor according to claim 1, wherein the urging member is attached to the fixed body in a state where at least a part of the engagement claw portion is press-fitted into the engagement hole. The engaging claw portion is
A main body formed along the outer surface of the fixed body;
A press-fit portion formed at the tip of the main body and press-fitted into the engagement hole;
The motor according to claim 1, further comprising: At least the inner surface of the engagement hole,
A first support surface perpendicular to the axis of the rotor;
A second support surface facing the first support surface and positioned on the tip side from the first support surface;
Formed,
The press-fitting part is
A first press contact portion formed by bending from the main body portion inward in the radial direction of the rotor, and press-contacted to the first support surface;
A bent portion formed by bending in the axial direction of the rotor from the first pressure contact portion, and sandwiched between the first support surface and the second support surface;
The motor according to claim 2, further comprising:   4. The motor according to claim 3, wherein at least one of the front end of the sandwiched portion and the second support surface is formed with a notched portion in which a part thereof is notched. . The press-fitting part further includes
It has a second pressure contact portion that is formed by bending outward from the sandwiched portion so as to face the first pressure contact portion and is in pressure contact with the second support surface. The motor according to claim 3.   6. The motor according to claim 5, wherein an end portion of the second pressure contact portion is bent toward a distal end side and is in contact with an outer surface of the fixed body.   Two side surfaces intersecting with the first support surface and the second support surface are formed on the inner surface of the engagement hole, and the two side surfaces and the sandwiched portion are in a separated state. The motor according to any one of claims 3 to 6, characterized in that: At least the inner surface of the engagement hole,
A first support surface perpendicular to the axis of the rotor;
Two side surfaces intersecting the first support surface and facing each other;
Formed,
The press-fitting part is
A first press contact portion formed by bending from the main body portion inward in the radial direction of the rotor, and press-contacted to the first support surface;
A bent portion formed by bending from the first pressure contact portion in the axial direction of the rotor, and sandwiched between the two side surfaces;
The motor according to claim 2, further comprising:   9. The motor according to claim 8, wherein at least one of both ends of the sandwiched portion and the two side surfaces is formed with a notched portion in which a part thereof is notched. The press-fitting part further includes
The motor according to claim 8, further comprising a second press-contact portion that is formed to be bent from the sandwiched portion toward the outer side in the radial direction of the rotor and is press-contacted to each of the two side surfaces.   11. The motor according to claim 10, wherein an end portion of the second pressure contact portion is bent toward a distal end side and is in contact with an outer surface of the fixed body.   A second support surface facing the first support surface is formed on the inner surface of the engagement hole, and the second support surface and the sandwiched portion are in a separated state. The motor according to any one of claims 8 to 11.   The motor according to any one of claims 1 to 12, wherein the engagement hole is formed in a motor case covering the stator. The motor according to claim 13, wherein the sandwiched portion does not protrude into the stator.

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