JP6155068B2 - motor - Google Patents

Description

  The present invention relates to a motor in which a distal end portion of a rotary shaft and both end portions of a support shaft are supported on a frame fixed to a motor main body portion.

  In motors such as stepping motors, a structure has been proposed in which the tip of the rotating shaft and both ends of the supporting shaft are supported by a frame fixed to the motor body. The supporting shaft is driven directly by the rotating shaft. Used as a guide shaft for a driven member that moves. The frame connects the first plate portion fixed to the motor body portion, the second plate portion facing the first plate portion and supporting the tip portion of the rotating shaft, and the first plate portion and the second plate portion. And a connecting portion.

  In the motor having such a configuration, when the support shaft is fixed to the frame, after mounting holes made of through holes are formed in the first plate portion and the second plate portion, impact is applied to the mounting holes to generate burrs. A structure in which the end portion of the support shaft is fixed using a small-diameter portion inside is proposed (see Patent Document 1).

JP 2001-286108 A

  However, in the configuration described in Patent Document 1, since a burr is used, there is a problem in that the fixing strength of the support shaft with respect to the frame is not sufficient for the laborious operation.

  In view of the above problems, an object of the present invention is to provide a motor capable of efficiently and appropriately fixing the end of a support shaft to a frame fixed to a motor main body.

In order to solve the above-described problems, a motor according to the present invention includes a motor main body, a rotating shaft protruding from the motor main body, a driven member driven by the rotating shaft, and a frame fixed to the motor main body. And a support shaft held by the frame in parallel with the rotating shaft, the frame facing the first plate portion, a first plate portion fixed to the motor main body portion. A second plate portion for supporting the tip end portion of the rotating shaft, and a connecting portion for connecting the first plate portion and the second plate portion, wherein the first end portion of the support shaft is the first end portion. Fixed to the plate portion, a second end portion of the support shaft is fixed to the second plate portion, a first fixed portion of the first end portion and the first plate portion, and the second end portion and the in at least one of the second fixed portion of the second plate portion, the through hole in which the support shaft is formed on the frame To the side where the supporting shaft extends in a state of Tsu is fixed by welding from the opposite side, welds that are fixed by the welding, the outer surface of the the distal end surface of the end portion of the support shaft frame It is formed in the flat surface which consists of .

In the present invention, at least one of the first fixed portion between the first end portion and the first plate portion and the second fixed portion between the second end portion and the second plate portion has a support shaft and a frame. It is fixed by welding, and with such a fixing structure, the support shaft and the frame can be efficiently fixed in a short time. Moreover, if it is fixing by welding, sufficient strength can be stably obtained, and thus the support shaft can be appropriately fixed to the frame. Furthermore, at least one of the first fixed portion and the second fixed portion is welded from the side opposite to the side on which the support shaft extends in a state where the support shaft is fitted in the through hole formed in the frame. Therefore, when welding is performed using a laser spot or the like, the support shaft and the frame do not hinder the welding operation.

  In the present invention, it is preferable that the support shaft and the frame are fixed by welding in both the first fixed portion and the second fixed portion.

  In the present invention, both the first fixed portion and the second fixed portion are opposite to the side on which the support shaft extends in a state where the support shaft is fitted in the through hole formed in the frame. It is preferable that it is welded from the side.

  In the present invention, one of the first fixed portion and the second fixed portion is a side on which the support shaft extends in a state in which the support shaft is fitted in the through hole formed in the frame. May be welded from the opposite side, and on the other hand, a stepped stepped end of the support shaft may be fitted into a stepped hole formed in the frame. According to such a configuration, when one end is fixed by welding, on the other side, the stepped end of the support shaft can be fitted into the stepped hole so that the support shaft is supported. Easy to work.

  In the present invention, it is preferable that at least one of the first fixed portion and the second fixed portion is welded only in a part in the circumferential direction of the support shaft. According to this configuration, the time required for welding can be shortened.

  In the present invention, the first plate portion includes a first projecting portion that projects outward in the radial direction from the motor main body portion when viewed from the axial direction of the rotating shaft, and the second plate portion includes the rotating shaft. A second projecting portion projecting radially outward from the motor body when viewed from the axial direction, wherein the first end portion is fixed to the first projecting portion, and the second end portion is the second projecting portion. It is preferable to be fixed to. According to such a configuration, the strength of the frame can be ensured by the structure of the frame and the support shaft even when the interval between the rotation shaft and the support shaft is set wide.

  In this invention, it is preferable that the space | interval of the said rotating shaft and the said support shaft is wider than the space | interval of the said rotating shaft and the said connection part. According to this configuration, the frame can be reinforced by the structure of the frame and the support shaft.

  In the present invention, the driven member is a linear motion member including an engaging portion that engages with a spiral groove formed on an outer peripheral surface of the rotating shaft, and a guide hole that slides on the support shaft. Can be adopted.

In the present invention, at least one of the first fixed portion between the first end portion and the first plate portion and the second fixed portion between the second end portion and the second plate portion has a support shaft and a frame. It is fixed by welding, and with such a fixing structure, the support shaft and the frame can be efficiently fixed in a short time. Moreover, if it is fixing by welding, sufficient strength can be stably obtained, and thus the support shaft can be appropriately fixed to the frame. Furthermore, at least one of the first fixed portion and the second fixed portion is welded from the side opposite to the side on which the support shaft extends in a state where the support shaft is fitted in the through hole formed in the frame. Therefore, when welding is performed using a laser spot or the like, the support shaft and the frame do not hinder the welding operation.

It is explanatory drawing of the motor which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the process of fixing a support shaft to a flame | frame among the manufacturing processes of the motor which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the process of fixing a support shaft to a flame | frame among the manufacturing processes of the motor which concerns on Embodiment 2 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 non-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. A motor 1 shown in FIG. 1 is a stepping motor used for driving a lens of a digital camera, 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 42 (first coil bobbin 42A and second coil bobbin 42B) around which the coil wire 46 is wound are disposed so as to overlap each other in the motor axial direction L. In each case, the inner stator core 43 and the outer stator core 44 are arranged to overlap each other. More specifically, an annular inner stator core 43A and an outer stator core 44A having a U-shaped cross section are arranged on both sides of the first coil bobbin 42A in the motor axial direction L, and the motor coil direction L in the second coil bobbin 42B. An annular inner stator core 43B and an outer stator core 44B having a U-shaped cross section are disposed on both sides of each other. On the inner peripheral surfaces of the first coil bobbin 42A and the second coil bobbin 42B, a plurality of pole teeth 45 of the inner stator cores 43A and 43B and the outer stator cores 44A and 44B are arranged in the circumferential direction. Thus, the cylindrical stator 40 provided with the rotor arrangement | positioning hole 41 is comprised, and the rotor 5 is coaxially arrange | positioned inside the stator 40 radial direction. In this embodiment, the outer stator cores 44A and 44B each extend to the radially outer side of the first coil bobbin 42A and the second coil bobbin 42B to constitute a motor case.

  Therefore, in this embodiment, the motor body 10 is constituted by the stator 40. For this reason, the end surface 11 on the output side L1 of the motor body 10 is composed of an annular portion 47 of the outer stator core 44A, and the end surface 12 on the counter-output side L2 of the motor body 10 is composed of an annular portion 48 of the outer stator core 44B. The outer peripheral surface 13 of the motor main body 10 includes a cylindrical portion 49 formed outside the outer stator cores 44A and 44B.

  In the rotor 5, the rotation shaft 50 extends in the motor axial direction L, and the rotation shaft 50 protrudes from the end surface 11 on the output side L <b> 1 of the motor body 10. A cylindrical permanent magnet 59 is fixed by an adhesive 56 at a position near the counter-output side L2 of the rotary shaft 50. The permanent magnet 59 is opposed to the pole teeth 45 of the stator 40 with a predetermined interval on the inner side of the stator 40 (rotor arrangement hole 41) on the inner side in the radial direction. The rotating shaft 50 is made of a metal material such as stainless steel, brass, or aluminum, and a spiral groove 58 is formed on the outer peripheral surface 57 of the outer peripheral surface of the rotating shaft 50 that protrudes from the motor main body 10 (output side L1). Has been. 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 frame 3)
A frame 3 is provided on the output side L1 with respect to the motor body 10. The frame 3 includes a first plate portion 31 fixed to the end surface 11 (the annular portion 47 of the outer stator core 44A) of the output side L1 of the motor body 10 by a method such as welding, and the first plate portion 31 on the output side L1. A second plate portion 32 that faces the end portion 51 on the output side L1 of the rotary shaft 50 and a connecting portion that extends in the motor axial direction L and connects the first plate portion 31 and the second plate portion 32. 33. The first plate portion 31 has a hole 30 through which the rotation shaft 50 passes. Further, the first plate portion 31 includes a first protruding portion 313 that protrudes radially outward from the outer peripheral surface 13 of the motor main body portion 10 when viewed from the axial direction of the rotating shaft 50 (motor axial direction L). Further, the second plate portion 32 includes a second projecting portion 323 that projects outward in the radial direction from the outer peripheral surface 13 of the motor main body portion 10 when viewed from the axial direction of the rotating shaft 50 (motor axial direction L).

  Here, a metal support shaft 9 is disposed between the first plate portion 31 and the second plate portion 32, and both ends of the support shaft 9 are held by the metal frame 3. More specifically, the first end portion 91 on the opposite side L2 of the support shaft 9 is fixed to the first plate portion 31 of the frame 3, and the second end portion 92 on the output side L1 of the support shaft 9 is fixed to the frame. 3 is fixed to the second plate portion 32. The structure for fixing the support shaft 9 to the frame 3 will be described later with reference to FIG.

(Bearing structure of output side L1)
In the frame 3, the second plate portion 32 is configured with an output-side L1 bearing mechanism 6 that supports an output-side L1 end 51 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 second plate portion 32 of the frame 3, and the end portion 51 on the output side L 1 of the rotating shaft 50 is connected to the opposite output side L 2 of the bearing member 60. The end surface is fitted and supported inside a 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 second plate portion 32 while passing through a hole 329 formed in the second plate portion 32 of the frame 3. The member 60 is restricted from moving to the output side L1 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.

(Schematic configuration of the bearing mechanism 7 on the non-output side L2)
In the motor 1 according to the present embodiment, the counter-output side L2 end portion 52 of the rotary shaft 50 is supported on the counter-output side L2 end portion 52 of the rotary shaft 50 so as to be rotatable in the motor axial direction L and the radial direction. A bearing mechanism 7 on the side L2 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 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. The end plate 8 is disposed on the opposite side L2 to the bearing member 70, and the bearing member 70 is held between the end plate 8 and the stator 40. Here, the end plate 8 is configured as a biasing member that biases the rotating shaft 50 toward the output side L1. More specifically, the end plate 8 includes a disc portion 81 fixed to the annular portion 48 on the counter-output side L2 of the stator 40 by welding or the like, and a leaf spring portion cut and raised at the center portion of the disc portion 81. 85, 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 biases 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.

(Fixing structure of support shaft 9)
In the motor 1 of this embodiment, the support shaft 9 is fixed between the first plate portion 31 and the second plate portion 32 of the frame 3 so as to be parallel to the rotary shaft 50, and the support shaft 9 is in the length direction. It is a round bar having a constant external dimension throughout. The support shaft 9 functions as a guide shaft for the driven member 2 or the like. For example, in the motor 1 of this embodiment, the driven member 2 includes an engaging portion 21 that engages with the spiral groove 58 formed on the outer peripheral surface 57 of the rotating shaft 50 and a guide hole 22 that slides on the support shaft 9. A linear motion member provided. Therefore, the support shaft 9 guides the driven member 2 along the motor axis direction L of the rotary shaft 50 while preventing the driven member 2 from rotating.

  Here, the first plate portion 31 includes a first projecting portion 313 that projects outward in the radial direction from the outer peripheral surface 13 of the motor body 10 when viewed from the axial direction of the rotating shaft 50 (motor axial direction L). The first end 91 of the support shaft 9 is fixed to the first overhang portion 313. The second plate portion 32 includes a second projecting portion 323 that projects outward in the radial direction from the outer peripheral surface 13 of the motor body 10 when viewed from the axial direction of the rotating shaft 50 (motor axial direction L). 2 The second end portion 92 of the support shaft 9 is fixed to the overhang portion 323. For this reason, the support shaft 9 is disposed on the outer side in the radial direction from the outer peripheral surface 13 of the motor body 10 when viewed in the axial direction of the rotating shaft 50 (motor axial direction L). Further, the connecting portion 33 of the frame 3 is disposed radially inward from the outer peripheral surface 13 of the motor main body 10 when viewed from the axial direction of the rotating shaft 50 (motor axial direction L). Therefore, the interval between the rotating shaft 50 and the support shaft 9 is wider than the interval between the rotating shaft 50 and the connecting portion 33.

  In configuring the motor 1 having such a configuration, in this embodiment, the first fixed portion 9 a between the first end portion 91 of the support shaft 9 and the first plate portion 31 of the frame 3, and the second end of the support shaft 9 are configured. The support shaft 9 and the frame 3 are fixed by welding at least one of the second fixing portions 9b of the portion 92 and the second plate portion 32 of the frame 3. In this embodiment, the support shaft 9 and the frame 3 are fixed by welding in both the first fixed portion 9a and the second fixed portion 9b.

  More specifically, in the first fixed portion 9 a, the first end 91 of the support shaft 9 fits into the attachment hole 310 formed of a through hole formed in the first projecting portion 313 of the first plate portion 31 of the frame 3. In this state, the first end portion 91 and the first overhang portion 313 are welded. In that case, welding is performed from the opposite side (counter output side L2) to the side where the support shaft 9 extends. In the second fixed portion 9b, the second end portion 92 of the support shaft 9 is fitted in the attachment hole 320 formed of a through hole formed in the second projecting portion 323 of the second plate portion 32 of the frame 3. The two end portions 92 and the second overhang portion 323 are welded. In that case, welding is performed from the opposite side (output side L1) to the side where the support shaft 9 is extended.

  In this embodiment, only a part of the support shaft 9 in the circumferential direction is welded at the first fixed portion 9a and the second fixed portion 9b. For this reason, in the 1st fixed part 9a and the 2nd fixed part 9b, the welding parts Lr and Ls exist only in the opposite side to the side in which the rotating shaft 50 is located among the circumferential directions of the support shaft 9. FIG. Further, the support shaft 9 has the same dimensions as those between the first plate portion 31 and the second plate portion 32. For this reason, the first end portion 91 of the support shaft 9 does not protrude from the first plate portion 31 to the counter-output side L2, and the first end portion 91 of the support shaft 9 is not counter-output side L2 of the first plate portion 31. It is in the same position as the surface. Further, the second end portion 92 of the support shaft 9 does not protrude from the second plate portion 32 to the output side L1, and the second end portion 92 of the support shaft 9 is connected to the surface of the output side L1 of the second plate portion 32. In the same position. Therefore, the welding location Lr is formed on a flat surface formed by the tip surface 915 of the first end portion 91 of the support shaft 9 and the surface on the non-output side L2 of the first plate portion 31, and the welding location Ls is formed on the support shaft 9. The second end portion 92 is formed on a flat surface composed of the front end surface 925 and the output side L1 surface of the second plate portion 32.

(Fixing process of support shaft 9)
FIG. 2 is an explanatory diagram illustrating a process of fixing the support shaft 9 to the frame 3 in the manufacturing process of the motor 1 according to the first embodiment of the present invention, and FIGS. ), (D) are explanatory diagrams of the steps constituting the second fixed portion 9b, explanatory diagrams showing an enlarged area surrounded by the circle Le in FIG. 2 (a), and enclosed by the circle Le in FIG. 2 (a). FIG. 6 is an enlarged cross-sectional view showing a region and an explanatory view of a process of forming the first fixed portion 9a.

  First, as shown in FIG. 2A, the driven member 2 is coupled to the rotating shaft 50. In this state, an attachment hole 310 made of a through hole is formed in the first plate portion 31, and an attachment hole 320 made of a through hole is formed in the second plate portion 32. Here, the inner diameter dimension of the attachment hole 310 and the attachment hole 320 is slightly larger than the outer diameter dimension of the support shaft 9. Accordingly, the support shaft 9 can be passed through the driven member 2 from the attachment hole 310 through the support shaft 9 and can be fitted into the attachment hole 320. At that time, the first end portion 91 of the support shaft 9 is received by the receiving member 98 so that the support shaft 9 does not fall down downward. In this embodiment, since the inner diameter dimensions of the mounting holes 310 and 320 are larger than the outer diameter dimension of the support shaft 9, it is difficult to apply a load to the first plate portion 31, the second plate portion 32 and the support shaft 9 during assembly. Therefore, the first plate portion 31, the second plate portion 32, and the support shaft 9 are not easily deformed or inclined.

  In this state, as indicated by an arrow Lb, of the boundary portion between the outer peripheral surface of the second end portion 92 of the support shaft 9 and the inner peripheral surface of the mounting hole 320, the side opposite to the side where the rotary shaft 50 is located. A laser spot is irradiated from the output side L1 toward the boundary portion, and the second end portion 92 and the second plate portion 32 are welded. As a result, as shown in FIGS. 2A, 2B, and 2C, a second fixed portion 9b between the second end portion 92 and the second plate portion 32 is formed, and in the second fixed portion 9b, The welding point Ls is formed only on the side opposite to the side where the rotary shaft 50 is located.

  Next, as indicated by an arrow La in FIG. 2D, the side where the rotation shaft 50 is located in the boundary portion between the outer peripheral surface of the first end 91 of the support shaft 9 and the inner peripheral surface of the mounting hole 310. A laser spot is irradiated from the opposite output side L2 toward the boundary portion on the opposite side to the first end portion 91 and the first plate portion 31. As a result, the first fixed portion 9a between the first end portion 91 and the first plate portion 31 is configured, and in the first fixed portion 9a, the welding point Lr is only on the side opposite to the side where the rotation shaft 50 is located. It is formed. As a result, the support shaft 9 is fixed to the frame 3.

(Main effects of this form)
As described above, in the motor 1 of this embodiment, the first fixed portion 9 a between the first end 91 of the support shaft 9 and the first plate portion 31 of the frame 3, and the second end 92 of the support shaft 9 In the second fixing portion 9b of the frame 3 with the second plate portion 32, the support shaft 9 and the frame 3 are fixed by welding. With such a fixing structure, the support shaft 9 and the frame 3 can be efficiently fixed in a short time unlike a form using burrs or the like or a form using an adhesive. In addition, if fixed by welding, unlike a form using burrs or the like or a form using an adhesive, sufficient strength can be stably obtained, and the adhesive adheres to an extra portion, etc. The support shaft 9 can be appropriately fixed to the frame 3 so that no problem occurs.

  Moreover, in the 1st fixing | fixed part 9a and the 2nd fixing | fixed part 9b, welding is performed from the opposite side (side shown by arrow La, Lb) from the side where the support shaft 9 is extended. For this reason, when welding is performed by irradiating a laser spot, the support shaft 9 and the frame 3 do not disturb the welding operation. Further, since the welding is performed from the side opposite to the side on which the support shaft 9 extends, the portion of the support shaft 9 sandwiched between the first plate portion 31 and the second plate portion 32 is not welded. It is unlikely to be deformed by heat. Therefore, the driven member 2 moves smoothly, and even if the welding mark is generated so as to protrude, the welding mark is opposite to the first plate part 31 on the counter-output side L2 or the second plate part 32. It is generated on the output side L1. Therefore, the movable range of the driven member 2 is not narrowed.

  In the first fixed portion 9a and the second fixed portion 9b, only a part in the circumferential direction of the support shaft 9 is welded. For this reason, the time required for welding can be shortened. Furthermore, since the welding position is on the side opposite to the side where the rotary shaft 50 is located, heat or the like due to welding is not easily transmitted to the motor body 10 side.

  Further, the first plate portion 31 includes a first projecting portion 313 that projects outward in the radial direction from the outer peripheral surface 13 of the motor main body 10 when viewed from the axial direction of the rotating shaft 50 (motor axial direction L). The first end portion 91 of the support shaft 9 is fixed to the one overhang portion 313. The second plate portion 32 includes a second projecting portion 323 that projects outward in the radial direction from the outer peripheral surface 13 of the motor main body 10 when viewed from the axial direction of the rotating shaft 50, and is supported by the second projecting portion 323. The second end 92 of the shaft 9 is fixed. For this reason, the support shaft 9 is disposed on the outer side in the radial direction from the outer peripheral surface 13 of the motor body 10 when viewed in the axial direction of the rotary shaft 50. Further, the interval between the rotating shaft 50 and the support shaft 9 is wider than the interval between the rotating shaft 50 and the connecting portion 33. Therefore, the frame 3 can be effectively reinforced by the structure including the frame 3 and the support shaft 9. In particular, in this embodiment, the frame 3 constitutes a structure that is integral with the support shaft 9, and the first plate portion 31 and the second plate portion 32 are interposed via the support shaft 9 at positions sufficiently separated from the connecting portion 33. Are connected. Therefore, even when a force for deforming the corner portion between the first plate portion 31 and the connecting portion 33 or the corner portion between the second plate portion 32 and the connecting portion 33 is applied, such deformation is unlikely to occur.

[Embodiment 2]
FIG. 3 is an explanatory diagram illustrating a process of fixing the support shaft 9 to the frame 3 in the manufacturing process of the motor 1 according to the second embodiment of the present invention, and FIGS. ) Is an explanatory view of a process for forming the second fixed portion 9b, a cross-sectional view showing an enlarged region surrounded by a circle Lf in FIG. 3A, and an explanatory view of a process for forming the first fixed portion 9a. is there. 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.

  Also in the motor 1 of this embodiment, as in the first embodiment, the support shaft 9 is fixed between the first plate portion 31 and the second plate portion 32 of the frame 3 so as to be parallel to the rotation shaft 50, and this The support shaft 9 functions as a guide shaft for the driven member 2.

  In manufacturing the motor 1 having such a configuration, in the present embodiment, first, the driven member 2 is coupled to the rotary shaft 50 as shown in FIG. In this state, an attachment hole 310 made of a through hole is formed in the first plate portion 31, and an attachment hole 320 made of a through hole is formed in the second plate portion 32. Here, the inner diameter dimension of the mounting hole 320 is slightly larger than the outer diameter dimension of the support shaft 9.

  On the other hand, as shown in FIG. 3B, the mounting hole 310 includes a large diameter portion 310a having a slightly larger inner diameter than the outer diameter of the support shaft 9, and a non-output side L2 from the large diameter portion 310a. Thus, a stepped hole is provided with a small diameter portion 310c having an inner diameter smaller than the outer diameter of the support shaft 9, and a step 310b is formed between the large diameter 310a and the small diameter 310c. Corresponding to this configuration, the first end portion 91 of the support shaft 9 has a large diameter portion 91a extending from the second end portion 92 side with the same outer diameter, and a counter-output side L2 from the large diameter portion 91a. And a stepped shaft end portion having a small diameter portion 91b having a smaller outer diameter than the large diameter portion 91a, and a step portion 91c is formed between the large diameter portion 91a and the small diameter portion 91b. . For this reason, when the support shaft 9 is passed from the attachment hole 320 side, the first end portion 91 of the support shaft 9 is supported by the attachment hole 310 formed of a stepped hole.

  In this state, as indicated by an arrow Lb in FIG. 3A, the side where the rotary shaft 50 is located on the boundary between the outer peripheral surface of the second end portion 92 of the support shaft 9 and the inner peripheral surface of the mounting hole 320. A laser spot is irradiated from the output side L1 toward the opposite side, and the second end portion 92 and the second plate portion 32 are welded. As a result, a second fixed portion 9b between the second end portion 92 and the second plate portion 32 is formed, and in this second fixed portion 9b, the welding point Ls is only on the side opposite to the side where the rotation shaft 50 is located. It is formed.

  Next, as indicated by an arrow La in FIG. 3C, the side where the rotation shaft 50 is located on the boundary between the outer peripheral surface of the first end 91 of the support shaft 9 and the inner peripheral surface of the mounting hole 310. Irradiates a laser spot from the opposite output side L2 toward the opposite side, and welds the first end portion 91 and the first plate portion 31. As a result, the first fixed portion 9a between the first end portion 91 and the first plate portion 31 is configured, and in the first fixed portion 9a, the welding point Lr is only on the side opposite to the side where the rotation shaft 50 is located. It is formed. As a result, the support shaft 9 is fixed to the frame 3.

  Thus, also in the present embodiment, as in the first embodiment, the first fixed portion 9a between the first end portion 91 of the support shaft 9 and the first plate portion 31 of the frame 3, and the second end portion of the support shaft 9 are used. In the second fixing portion 9b between the second plate portion 32 of the frame 92 and the frame 3, the support shaft 9 and the frame 3 are fixed by welding. Therefore, the support shaft 9 and the frame 3 can be efficiently fixed in a short time, and the same effects as in the first embodiment can be achieved, such as the support shaft 9 being properly fixed to the frame 3.

  In this embodiment, the stepped first end 91 of the support shaft 9 is fitted in the stepped hole (attachment hole 310) formed in the first plate portion 31 of the frame 3. For this reason, when the second end 92 is fixed by welding, the stepped first end 91 of the support shaft 9 is fitted into the stepped hole (attachment hole 310) at the first end 91, and the support shaft 9 is fixed. Since it can be set as the supported state, it is easy to perform welding work.

[Other embodiments]
In the above-described embodiment, the driven member 2 is a straight shaft provided with the engaging portion 21 that engages with the spiral groove 58 formed on the outer peripheral surface 57 of the rotating shaft 50 and the guide hole 22 that slides on the support shaft 9. Since the support shaft 9 functions as a guide shaft because it is a moving member, a driving gear is provided on the rotary shaft 50, and the gear meshing with the driving gear rotates as the driven member 2 to the support shaft 9. It may be a supported structure.

  In the above embodiment, the first fixing portion 9a and the second fixing portion 9b are fixed by welding. However, only one of the first fixing portion 9a and the second fixing portion 9b is welded. It may be a form in which fixing by is adopted. For example, in the second embodiment, fixing by welding is employed only in the second fixing portion 9b, and in the first fixing portion 9a, a stepped hole (mounting hole 310) formed in the first plate portion 31 of the frame 3 is used. The stepped first end 91 of the support shaft 9 may be fitted and fixed.

  In the above-described embodiment, both the frame 3 and the support shaft 9 are made of metal, but both the frame 3 and the support shaft 9 may be made of resin as long as welding can be used.

  In the above-described embodiment, both the first plate portion 31 and the second plate portion 32 are flat, but at least one of the first plate portion 31 and the second plate portion 32 is radial from the motor body 10. The structure bent in the middle of projecting outside may be sufficient. Further, the projecting portion may not be formed on the frame 3 and the fixing position of the support shaft 9 may overlap the motor main body portion 10 in the motor axial direction L. Further, the welding to the support shaft 9 may be all around. Further, the welding with respect to the support shaft 9 may be on the side where the motor main body 10 is located in the circumferential direction.

  Furthermore, the present invention is not limited to a stepping motor, and may be applied to other motors such as a motor with a brush.

DESCRIPTION OF SYMBOLS 1 Motor 2 Follower member 3 Frame 9 Support shaft 9a 1st fixed part 9b 2nd fixed part 10 Motor main-body part 31 1st board part 32 2nd board part 40 Stator 50 Rotating shaft 91 1st end part 92 2nd end part 313 First overhanging portion 323 Second overhanging portion La, Lb Laser spot irradiation direction Lr, Ls Welding location

Claims (8)

A motor body,
A rotating shaft protruding from the motor body,
A driven member that follows the rotating shaft;
A frame fixed to the motor body,
A support shaft held by the frame in parallel with the rotating shaft;
Have
The frame includes a first plate portion fixed to the motor body portion, a second plate portion facing the first plate portion and supporting a tip portion of the rotating shaft, the first plate portion, and the first plate portion. A connecting portion that connects the two plate portions;
A first end portion of the support shaft is fixed to the first plate portion;
A second end portion of the support shaft is fixed to the second plate portion;
At least one of the first fixed portion between the first end portion and the first plate portion and the second fixed portion between the second end portion and the second plate portion has the support shaft attached to the frame. It is fixed by welding from the side opposite to the side on which the support shaft extends in a state of being fitted in the formed through hole ,
The motor is characterized in that the welded portion fixed by the welding is formed on a flat surface including a tip end surface of the end portion of the support shaft and an outer surface of the frame .   The motor according to claim 1, wherein the support shaft and the frame are fixed by welding in both the first fixed portion and the second fixed portion. In both of the first fixed portion and the second fixed portion, welding is performed from the opposite side to the side on which the support shaft extends in a state in which the support shaft is fitted in a through hole formed in the frame. The motor according to claim 1, wherein the motor is provided. Wherein in one of the first fixed portion and the second fixed portion, the side on which the support shaft extends in a state in which the support shaft is fitted into the through hole formed in the frame from the opposite side Welded and
On the other hand, the motor according to claim 1, characterized in that the end portion of the stepped of the support shaft formed stepped hole in the frame is fitted. 5. The device according to claim 1, wherein at least one of the first fixed portion and the second fixed portion is welded only in a part in the circumferential direction of the support shaft. Motor. The first plate portion includes a first projecting portion that projects radially outward from the motor main body when viewed from the axial direction of the rotating shaft,
The second plate portion includes a second projecting portion that projects radially outward from the motor main body when viewed from the axial direction of the rotating shaft,
The first end is fixed to the first overhang;
The motor according to any one of claims 1 to 5, wherein the second end portion is fixed to the second overhanging portion . The motor according to claim 6 , wherein an interval between the rotating shaft and the support shaft is wider than an interval between the rotating shaft and the connecting portion . The driven member is a linear member including an engaging portion that engages with a spiral groove formed on an outer peripheral surface of the rotating shaft, and a guide hole that slides on the supporting shaft. Item 8. The motor according to any one of Items 1 to 7 .

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