JP2008187878A - Coil bobbin for small electric actuator, and method of manufacturing small electric actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil bobbin for a small electric actuator that can be set to a winding device surely, even if it is formed to be a near hollow cylinder to house a rotor inside it. <P>SOLUTION: A coil bobbin 511 has the shape of near hollow cylinder for housing a rotor 540 inside of it, with a coil winding groove 528 provided on the outer surface for winding a coil in the plane almost parallel to the axial direction of the rotor. A pair of recesses 526 engaged with a pair of chuck claws 952 are provided on the outer periphery of at least one side among both sides sandwiching the coil winding groove. The coil bobbin is halved in the axial direction of the rotor, with each of split bobbins 520 and 530 provided with a bearing hole in which a spindle end of the rotor is inserted for free rotation. At winding, the rotor is housed inside the coil bobbin and the chuck claw is engaged with the recess to grip the coil bobbin. Under that condition, the coil bobbin is rotated while a coil is wound in the coil winding groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coil bobbin for a small electric actuator used, for example, as drive means for an electric diaphragm device, and a method for manufacturing a small electric actuator using the coil bobbin.

  A small-sized electric actuator is used as a driving means in an electric diaphragm device incorporated in a photographing apparatus such as a video camera. As an electric actuator used for this type of application, the actuator described in Patent Document 1 is composed of a rotor and a stator, and the stator is divided in half by a plane including the central axis of the rotor and united between them. The coil bobbin that rotatably accommodates the rotor, a coil wound around the outer periphery of the coil bobbin, and a cylindrical yoke mounted on the outer periphery of the coil bobbin. In the rotor, a permanent magnet magnetized in the diameter direction is integrally provided on the outer periphery of the rotor shaft, and the coil is wound around the outer periphery of the coil bobbin in a plane substantially parallel to the axial direction of the rotor. .

  Further, in the electric throttle device described in Patent Document 2, an electric actuator is used in which a B-shaped coil bobbin is used and the rotor is fitted into the coil bobbin through the side opening.

JP-A-10-254022 Japanese Patent Laid-Open No. 11-183962

  By the way, when winding a coil on a coil bobbin with a winding device, it is common to perform winding while setting and rotating the coil bobbin on the rotating shaft of the winding device. Even in the actuator, it seems that winding is performed on the coil bobbin in the manufacturing stage, but when the coil bobbin is formed in a substantially hollow cylindrical shape and the rotor is accommodated therein, the coil bobbin is accommodated in the state where the rotor is accommodated. However, it is impossible to penetrate the rotating shaft of the winding device, and it is necessary to take other measures.

  In consideration of the above circumstances, the present invention provides a coil bobbin for a small electric actuator that is formed in a substantially hollow cylindrical shape and can be securely set in a winding device even when the rotor is accommodated therein, and its An object of the present invention is to provide a manufacturing method of a small electric actuator using a coil bobbin.

  The coil bobbin for the small electric actuator according to the first aspect of the present invention has a substantially hollow cylindrical shape capable of rotatably accommodating the rotor therein, and the coil can be wound around the outer surface in a plane substantially parallel to the axial direction of the rotor. A pair of recesses that have a coil winding groove and that can grip a coil bobbin by engaging a pair of chuck claws on at least one outer periphery of both sides sandwiching the coil winding groove are provided. It is characterized by.

  A second aspect of the present invention is the coil bobbin for the small electric actuator according to the first aspect, wherein the coil bobbin is divided into two in the axial direction of the rotor, and the shaft end of the rotor can be freely rotated on each of the divided bobbins. A bearing hole to be fitted is provided.

  Invention of Claim 3 is a manufacturing method of the small electric actuator including the process of winding a coil on the perimeter of a coil bobbin, The process of accommodating a rotor in the inside of a coil bobbin of Claim 1 or 2, and after this process, A step of gripping the coil bobbin by engaging a pair of chuck claws with a recess provided on the outer periphery of the coil bobbin, and a coil in the coil winding groove while rotating the coil bobbin while being gripped by the chuck claws. And a step of winding.

  A fourth aspect of the present invention is the method of manufacturing the small electric actuator according to the third aspect, wherein a protruding piece for detecting directionality is provided on an outer peripheral portion of only one side of both sides sandwiching a coil winding groove of the coil bobbin. The coil bobbins arranged in the same direction are prepared on the alignment device while the presence or absence of the projecting pieces is detected by the alignment device, and the prepared coil bobbins are gripped by the chuck claws.

  According to the first aspect of the present invention, the coil bobbin can be gripped in a cantilever manner only by one side sandwiching the coil winding groove by engaging the pair of chuck claws with the recess. Therefore, by rotating the chuck claw as it is, the coil can be wound around the outer coil winding groove while rotating the coil bobbin.

  According to the invention of claim 2, since the coil bobbin is divided into two in the axial direction of the rotor, the rotor is rotated into the coil bobbin by combining the divided bobbins while fitting the shaft end of the rotor into the bearing hole of each divided bobbin. Can be accommodated freely. Therefore, assembly can be simplified.

  According to the invention of claim 3, after the rotor is housed in the coil bobbin, the coil bobbin is held in a cantilever shape only by one side sandwiching the coil winding groove by engaging the pair of chuck claws with the recess. By rotating the chuck claw as it is, the coil can be wound around the outer coil winding groove while rotating the coil bobbin. Therefore, even when a large number of coil bobbins are arranged side by side, winding can be performed while simultaneously rotating the coil bobbins.

  According to the invention of claim 4, since the coil bobbin can be gripped by the chuck pawl in a state in which the coil bobbin is aligned in a certain direction, even when two types of coils for driving and braking are wound around the coil winding groove, the coil bobbin is distinguished and wound. Line can be done.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing a configuration of an electric diaphragm device incorporating an actuator using the coil bobbin of the embodiment as diaphragm blade driving means, FIG. 2 is a perspective view showing a configuration of a diaphragm substrate in the electric diaphragm device, and FIG. FIG. 4 is an exploded perspective view showing the configuration of the actuator of the electric diaphragm device, FIG. 5 is an exploded perspective view showing the configuration of the main unit of the actuator, and FIG. FIG. 7 is a perspective view showing the external appearance of the bobbin unit (coil bobbin incorporating a rotor) in a state before winding the coil, FIG. 7 is a perspective view showing the external appearance of the opposite side of the bobbin unit, and FIG. FIG.

FIG. 9 is a perspective view for explaining a method of aligning the bobbin unit with a certain direction when winding the coil on the bobbin unit, and FIG. 10 is a method of eliminating a bobbin unit that is not aligned with an appropriate direction. FIG. 11 is a perspective view seen from the front of a chuck device that chucks a properly aligned bobbin unit, FIG. 12 is a perspective view showing the relationship between the chuck device and the bobbin unit, and FIG. FIG. 14 is a perspective view showing a state where a bobbin unit is gripped by the chuck device, FIG. 14 is a perspective view showing a state where a plurality of bobbin units gripped by the chuck device are mounted on a coil winding device, and FIG. FIG. 16B is a cross-sectional view showing a state in which the coil is wound around the coil winding groove, and FIG. 16 is a completed state of the electric throttle device. FIG. 17 is a schematic longitudinal sectional view showing the actuator mounting portion cut in two specific planes in the completed state, FIG. 18 is a schematic longitudinal sectional view showing the same part cut in another plane, and FIG. FIG. 17 is a perspective view showing an example in which an electric wire unit is pulled out on the opposite side to FIG.

  As shown in FIG. 1, this electric diaphragm device is in a state where a rectangular plate-shaped diaphragm substrate 100 made of a resin molded product and a bottom surface (on one plate surface) of the diaphragm substrate 100 are superimposed on each other. A pair of diaphragm blades 200 and 300 that are slidably assembled, and a blade cover that covers the diaphragm blades 200 and 300 on the lower surface of the diaphragm substrate 100 after the diaphragm blades 200 and 300 are assembled on the lower surface of the diaphragm substrate 100 400, an actuator 500 as an aperture driving device assembled to one end portion in the longitudinal direction of the upper surface of the aperture substrate 100, and an electric wire unit 600 connected to the actuator 500.

  The diaphragm substrate 100 is provided with a flat slide base portion 101 on which the diaphragm blades 200 and 300 slide, and an actuator mounting portion 102 is provided at one end of the slide base portion 101 in the longitudinal direction. The slide base 101 is provided with an opening 103 that forms an optical path. On the side of the slide base 101 where the diaphragm blades are arranged, guide pins (reference numerals omitted) for guiding the diaphragm blades 200 and 300 and the blade cover 400 are provided. An engaging claw 104 is provided.

  Further, the blade cover 400 includes an opening 401 that forms an optical path, an engaged portion 402 that engages with the engaging claw 104 of the diaphragm substrate 100, and a protective plate that covers the lower surface of the actuator mounting portion 102 of the diaphragm substrate 100. Part 405, ventilation slit 406 formed in the peripheral part of protection plate part 405, and engaged part 407 engaged with engagement part 141 (see FIG. 3) of actuator mounting part 102 of diaphragm substrate 100. Is provided.

  Each diaphragm blade 200, 300 is provided with a notch-shaped or hole-shaped through-hole portion 201, 301 for forming a diaphragm aperture. The optical path can be adjusted by sliding the diaphragm blades 200 and 300 linearly on the diaphragm substrate 100 in the longitudinal direction.

  Further, filters (for example, ND filters) 205 and 305 are attached to the through-hole portions 201 and 301 forming the aperture openings of the aperture blades 200 and 300 so that the filter function is exhibited when the aperture is minimum. . In addition, long grooves 202 and 302 are provided in the vicinity of the side edges of the diaphragm blades 200 and 300 in parallel with the side edges. By fitting these long grooves 202 and 302 into guide pins (reference numerals omitted) of the diaphragm substrate 100, the diaphragm blades 200 and 300 are held so as to be linearly slidable along the longitudinal direction of the diaphragm substrate 100.

As elements for driving the diaphragm blades 200 and 300, first, lateral grooves 204 and 304 perpendicular to the sliding direction of the diaphragm blades 200 and 300 are provided at the longitudinal ends of the diaphragm blades 200 and 300, respectively. Yes. On the other hand, a drive lever 542 is provided on the actuator 500 attached to the actuator attachment portion 102 of the diaphragm substrate 100. The drive lever 542 has drive pins 543 protruding toward the diaphragm substrate 100 at both ends, and a central portion thereof is integrated with a rotor shaft (described later) of the actuator 500. Each drive pin 543 engages with lateral grooves 204 and 304 provided at the longitudinal ends of the aperture blades 200 and 300, respectively. With this, when the actuator 500 is driven to rotate, the drive pin 543 is rotated. The two diaphragm blades 200 and 300 are linearly slid in opposite directions to adjust the aperture of the optical path.

  Next, the actuator mounting portion 102 of the diaphragm substrate 100 will be described with reference to FIGS. A substantially circular actuator mounting hole 121 passes through the actuator mounting portion 102. An arcuate guide wall 122 that guides the insertion of the actuator 500 is erected on a part of the periphery of the actuator mounting hole 121 (on the opposite side of the slide base 101), and the above-described blade cover 400 is engaged at the lower end thereof. An engaging portion 141 for stopping is formed.

  In addition, the actuator 500 can be placed from above at four locations (two locations on the slide base 101 side and two locations on the opposite side) at approximately equal intervals in the circumferential direction on the periphery of the actuator mounting hole 121. A projecting piece-shaped actuator seat 123 is provided, and each actuator seat 123 is provided with an engagement hole 123a for inserting a pin on the actuator 500 side (a pin indicated by reference numeral 535a in FIG. 6).

  In addition, a pair of locking claws (yoke engagement) for locking the actuator 500 are provided at two positions on the periphery of the actuator mounting hole 121 that do not interfere with the actuator seat 123 and face each other across the center of the actuator mounting hole 121. The pawl 130 is erected. On the upper inner surface side of the lock claw 130, a hook 131 whose upper surface is a guide slope is provided. A pair of guide pillars 125 are erected on both sides of each lock claw 130. These guide pillars 125 have a guide surface 125 a that guides the outer periphery of a yoke 570 of the actuator 500 described later, and a guide surface 125 b that guides the flange 573 at the lower end of the yoke 570 toward the lock claw 130.

  In addition, electric wire clamp portions 150 are provided on both sides of the actuator mounting portion 102. The electric wire clamp portion 150 has a substantially C-shape composed of a vertical arm 151 and a curved arm 152, and utilizes the bending of both arms 151 and 152 from a gap 153 between the tips of the vertical arm 151 and the curved arm 152. By inserting the electric wire inside the bending arm 152, the function of holding the electric wire so as not to come off is exhibited. The vertical arm 151 is provided with a guide slope 151 a for facilitating the insertion of an electric wire, and a retaining protrusion 152 a is provided on the inner surface side of the distal end of the bending arm 152.

Next, the actuator 500 will be described with reference to FIGS.
As shown in FIG. 4, the actuator 500 is of a rotor type that rotates within a predetermined angular range, and is composed of a rotor 540 and a stator (coil bobbins 511, coils 591 and 592, and a yoke 570 as a center. ), A circuit board 580, and a magnetic piece 590 that attracts and holds the position of the rotor 540 when not energized. When the drive lever 542 is operated so that the aperture blades 200 and 300 are in the middle position between the maximum aperture position (the aperture open position) and the minimum aperture position (the fully open position), the magnetic piece 590 has the permanent magnet 545 of the rotor 540. It is arranged at a position equidistant from the N pole and the S pole, and has a function of generating an attractive force between the N pole and the S pole, thereby giving a rotational biasing force to the rotor.

The rotor 540 includes a resin-made rotor shaft 541, a permanent magnet 545 fixed to the rotor shaft 541, and a drive pin 543 that is integrally formed with the lower end of the rotor shaft 541 and engages with the aperture blades 200 and 300 at the tip. Drive lever 542. The permanent magnet 545 has a cylindrical shape that is polarized in the diametrical direction to an N-pole and an S-pole, and the rotor shaft 541 passes through the central portion thereof. The drive lever 542 extends in the opposite direction 180 degrees from the rotation center of the rotor shaft 541 and is a pair of drive pins 543 at a position equidistant from the rotation center of the rotor shaft 541 and spaced apart by 180 degrees in the circumferential direction. Is provided. In this case, the directions of the magnetic poles N and S of the permanent magnet 545 coincide with the direction in which the drive lever 542 extends, and the rotor shaft 541 and the permanent magnet 545 are fitted to each other to facilitate the coincidence. A concave portion 546 and a convex portion 545a for positioning in the circumferential direction are provided.

  The stator of the actuator 500 is formed on the outer periphery of the coil bobbin 511 with the resin coil bobbin 511, the driving and braking coils 591 and 592 wound around the outer periphery of the coil bobbin 511, and the coils 591 and 592 wound. And a fitted cylindrical yoke 570. The yoke 570 is formed by projecting a pair of flange portions 573 on the outer periphery of the lower end 572 of the cylindrical peripheral wall 571 so as to be separated from each other by 180 degrees in the circumferential direction.

  The coil bobbin 511 is configured as a combined body of an upper bobbin (half bobbin) 520 and a lower bobbin (bobbin half) 530 that are divided into two in the axial direction of the rotor 540, and the rotor 540 is accommodated inside the coil bobbin 511. The upper and lower shaft ends 541b and 541a of the rotor shaft 541 are rotatably fitted in the bearing holes 522 and 532 of the upper bobbin 520 and the lower bobbin 530, respectively.

  The upper bobbin 520 includes an upper end wall 521 having a bearing hole 522, substantially cylindrical peripheral wall portions 524 and 525, and a partition wall 527 that partitions the coil winding groove 528 into two. The peripheral wall portion 525 having a large diameter is a portion that fits into the inner peripheral surface of the cylindrical wall 571 of the yoke 570, and is arranged at four positions on the circumference at intervals. On the other hand, the peripheral wall portion 524 having a small diameter is formed as a recessed portion between the peripheral wall portions 525 having a large diameter. Both sides of the partition wall 527 are also formed as a peripheral wall portion 524 having a small diameter, and this portion is a coil winding groove 528 sandwiched between the peripheral wall portion 525 having a large diameter and the partition wall 527.

  Further, as shown in FIG. 7, one end of a pair of peripheral wall portions 524 having a small diameter arranged at a position orthogonal to the partition wall 527 is positioned at the upper end portion and the front center portion for positioning at the time of chucking described later. Are provided with a notch 524a and a recess 524b. Further, as shown in FIG. 6, the peripheral wall portion 525 having a large diameter is provided with a recess 526 for engaging a chuck claw (indicated by reference numeral 952 in FIGS. 11 to 13) during chucking. Accordingly, a pair of recesses 526 for engaging the chuck claws are provided on both sides of the coil winding groove 528, respectively. In addition, a positioning protrusion 529 for detecting the direction of the coil bobbin 511 is provided at the lower end of the peripheral wall 524 having a small diameter opposite to the side where the notch 524a and the recess 524b for positioning during chucking are provided. Is provided. The projecting piece 529 is used when aligning the direction of the coil bobbin 511 with the aligning device.

  In addition, a fan-shaped substrate receiving surface 523 is provided on the upper end surface of the large-diameter peripheral wall portion 525 arranged at four locations, and each substrate receiving surface 523 is provided with an insertion hole 523a for the terminal pin 561. It has been. In the assembly stage of the actuator 500, as shown in FIG. 4, the circuit board 580 is placed on the board receiving surface 523, and the terminal pins 561 that are press-fitted into the insertion holes 523a and are conducted to both ends of the coils 591 and 592 are provided. By soldering to the through hole 583 of the insulating substrate 581 of the circuit board 580, both ends of the coils 591 and 592 and each conductor pattern 582 are connected to each other. Then, as shown in FIG. 16, by soldering the base end 602 of each wire 601 of the wire unit 600 having the connector 603 at the tip to each land of the conductor pattern 582, each wire 601 and each terminal pin 561 Are connected one to one.

  Further, the lower bobbin 530 includes a lower end wall 531 having a bearing hole 532, a pair of arcuate walls 534 erected on the peripheral edge of the lower end wall 531, and an outer side of the lower end wall 531. A fixed protrusion 535 protruding outward in the radial direction, an insertion pin 535a protruding on the lower surface of the fixed protrusion 535, and an upper bobbin 520 protruding upward in the vicinity of the fixed protrusion 535 And a pin portion 533 for fitting to the inner wall, and an arc wall 534 and a window portion 538 for leading the drive lever 542 secured between the arc walls 534.

  By combining the upper bobbin 520 and the lower bobbin 530 having the above-described configuration, a coil bobbin 511 having a substantially hollow cylindrical shape capable of accommodating the rotor 540 is formed. When the upper and lower bobbins 520 and 530 are combined, the rotor shaft 541 is combined. The bobbin unit 512 that accommodates the rotor 540 in a rotatable manner as shown in FIGS. 6 to 8 is configured by fitting the upper and lower shaft ends 541b and 541a into the respective bearing holes 522 and 532 of the upper and lower bobbins 520 and 530. Is done. At the stage of this bobbin unit 512, the tip of the drive lever 542 is led out to the outside from the window portion 538 secured at the joint of the upper bobbin 520 and the lower bobbin 530. In addition, a coil winding groove 528 capable of winding the coils 591 and 592 in a plane substantially parallel to the axial direction of the rotor 540 is formed on the outer surface of the coil bobbin 511. At this stage, the terminal pin 561 is attached.

  Then, by winding the coils 591 and 592 around the bobbin unit 512, the main body unit 510 before the insertion into the yoke 570 is configured, and the main body unit 512 is further inserted into the yoke 570, and the upper end of the main body unit 512 is inserted. The circuit board 580 is soldered to the actuator 500 to constitute the actuator 500.

Next, the assembly procedure of the actuator 500 will be described.
As described above, the coil bobbin 511 can be configured by combining the upper bobbin 520 and the lower bobbin 530. At that time, the upper bobbin 520 and the lower bobbin 530 are combined while fitting the upper and lower shaft ends 541b and 541a of the rotor shaft 541 in the bearing holes 522 and 532 of the upper and lower bobbins 520 and 530, respectively. As shown in FIG. 8, a bobbin unit 512 having a rotor 540 that is rotatably built therein is configured. At that stage, the terminal pin 561 is press-fitted into the insertion hole 523a.

  Next, the main unit 510 is configured by winding the coils 591 and 592 around the coil winding groove 528 of the bobbin unit 512. In doing so, first, the bobbin unit 512 is placed on the aligning device in order to align the direction of the bobbin unit 512. 9 and 10 show the main part of the alignment apparatus 900, and the bobbin unit 512 is conveyed by vibrations or the like from the left back to the right front in the figure.

  The alignment device 900 is provided with a lower rail 902 and an upper rail 903 on the front side of the vertical back plate 901, and the bobbin unit 512 is configured such that the coil winding groove 528 is slidably fitted to the lower rail 902. , Move in a certain posture. The back plate 901 is provided with a slide groove 905 into which the positioning protrusion 529 of the bobbin unit 512 is fitted. When the positioning protrusion 529 is provided on the back side of the bobbin unit 512, the slide groove 905 includes The bobbin unit 512 moves while the positioning protrusion 529 is fitted.

  The upper rail 903 is formed in a path such that the coil winding groove 528 gradually fits into the upper rail 903 as the bobbin unit 512 moves from the inlet side 903a to the outlet side 903b. In addition, on the lower rail 902 side where the coil winding groove 528 is surely fitted to the upper rail 903, a pit 904 for removing the bobbin unit 512 that is not in an appropriate direction is provided. When the positioning protrusion 529 is fitted in the slide groove 905 of the back plate 901, the bobbin unit 512 is not dropped from the drop hole 904 by being supported by the slide groove 905 and the upper rail 903. When the positioning protrusion 529 is not fitted, the engagement portion is only the upper rail 903, so the bobbin unit 512 falls from the pit 904 formed in the lower rail 902.

Therefore, as shown in FIG. 10, when the positioning protrusion 529 is facing the front, the bobbin unit 512 is dropped halfway, and when it is facing the back, the bobbin unit 512 is transported to the end. In other words, the latter is transported in a constant posture until the end with the proper orientation. Therefore, by using this aligning apparatus 900, the bobbin unit 512 can be handled with a certain direction even in mass production.

  FIG. 11 and FIG. 12 show a configuration diagram of a handling chuck device for winding a coil. The chuck device 950 includes a rod 951, a pair of chuck claws 952 provided at the tip of the rod 951, a positioning protrusion 953, and a positioning projection 954.

  When performing winding, first, the bobbin unit 512 is aligned with the alignment device 900 described above, and the bobbin unit 512 aligned in the same direction is gripped with the chuck claws 952. That is, as shown in FIGS. 12 and 13, the bobbin unit 512 is gripped by engaging the pair of chuck claws 952 with the two recesses 526 provided on the outer peripheral portion of the coil bobbin 511. In this case, a large number of chuck devices 950 are provided in the winding machine 960, and the bobbin units 512 can be arranged in a row. Then, while rotating the bobbin unit 512 while being gripped by the chuck claws 952, the main unit 510 is configured by winding the coils 591 and 592 around the coil winding groove 528 as shown in FIG. In this case, the coils 591 and 592 are wound around the outer periphery of the bobbin unit 512 in a plane substantially parallel to the axial direction of the rotor 540.

  Next, the main body unit 510 is removed from the chuck device 950, and as shown in FIG. 4, a cylindrical yoke 570 is fitted to the outer periphery thereof, and the circuit board 580 and the electric wire unit 600 are attached to constitute the actuator 500. Then, as shown in FIG. 16, the actuator 500 is mounted on the actuator mounting portion 102 of the diaphragm substrate 100 from above, thereby completing the electric diaphragm apparatus. Note that the electric wire 601 of the electric wire unit 600 can be pulled out to the right side as seen from the opening 103 as shown in FIG. 16, or can be pulled out to the left side as shown in FIG. In either case, the electric wire 601 can be reliably clamped by simply inserting the electric wire 601 into the electric wire clamp portion 150 provided on the diaphragm substrate 100 from above.

  When the actuator 500 is mounted on the actuator mounting portion 102 of the diaphragm substrate 100 as described above, the four fixed protrusions 535 provided on the coil bobbin 511 of the actuator 500 are provided on the diaphragm substrate 100 as shown in FIGS. The four pins 535a on the lower surface of the fixed projection piece 535 are engaged with the engagement holes 123a of the actuator receiving seat 123, whereby the actuator 500 is positioned. At the same time, the flange 573 at the lower end of the yoke 570 is engaged and locked with the yoke locking claw 130 on the diaphragm substrate 100 side, so that the fixed protrusion 535 of the coil bobbin 511 is interposed between the yoke 570 and the actuator seat 123. As a result, the actuator 500 is securely and firmly fixed to the diaphragm substrate 100. In this state, the two drive pins 543 of the drive lever 542 of the actuator 500 are engaged with the lateral grooves 204 and 304 of the diaphragm blades 200 and 300, respectively.

  As described above, in the case of this electric throttle device, the coil bobbin 511 that supports the rotor 540 is not split in half on the plane including the central axis of the rotor, and is combined, but the upper bobbin that is divided into two in the axial direction of the rotor 540 520 and the lower bobbin 530 are combined, so that the bearing holes 522 and 532 for rotatably supporting the rotor shaft 541 need not be divided in half, and the rotor shaft 541 is formed into the completely circular bearing holes 522 and 532. The shaft ends 541a and 541b can be fitted. Therefore, the rotor shaft 541 can be rotationally supported by a smooth bearing surface having no discontinuous portions on the entire circumference, and the operation can be stabilized.

  Further, since the shaft ends 541a and 541b of the rotor shaft 541 are fitted in the bearing holes 522 and 532 and both the upper bobbin 520 and the lower bobbin 530 are combined, assembly with uniform accuracy can be easily performed. Further, since the coils 591 and 592 are wound in a plane substantially parallel to the axial direction of the rotor 540, the bobbin 511 divided into two in the axial direction of the rotor 540 can be tightened by the coils 591 and 592, and the assembly The rigidity can be increased. Further, since the tip of the drive lever 542 formed integrally with the rotor shaft 541 is led out from the window portion 538 secured at the joint of the upper bobbin 520 and the lower bobbin 530, the axial dimension of the actuator 500 is made compact. Therefore, the entire diaphragm device can be reduced in thickness.

  Further, the yoke 570 positioned on the outer periphery of the actuator 500 is fixed to the diaphragm substrate 100 with the yoke locking claw 130, so that the internal coil bobbin 511 is sandwiched between the yoke 570 and the diaphragm substrate 100. 100, the coil bobbin 511, and the yoke 570 are integrated, and are more resistant to vibration and the like. In addition, the stability of the support of not only the yoke 570 but also the coil bobbin 511 is enhanced, so that the operation can be facilitated. Further, since the coil bobbin 511 inside the yoke 570 is not directly locked by the claw, it is not necessary to secure an extra dimension for engaging the claw and the coil bobbin, and the structure can be made compact. In addition, since the electric wire 601 connected directly to the coils 591 and 592 can be clamped to the diaphragm substrate 100, the wiring property of the electric wire 601 is improved.

  Further, when assembling the actuator 500, the coil bobbin 511 is held in a cantilever shape only by one side sandwiching the coil winding groove 528 by engaging the pair of chuck claws 952 with the recess 526. The coil can be wound around the outer peripheral coil winding groove 528 while rotating the chuck claw 952 as it is and rotating the coil bobbin. Therefore, even when a large number of coil bobbins 511 (bobbin units 512) are arranged side by side, winding can be performed on each coil bobbin at the same time. In addition, the positioning bobbin 511 is provided on the coil bobbin 511 so that the coil bobbin 511 can be gripped by the chuck pawl 952 in a state where the coil bobbin 511 is aligned in a certain direction. Even when the two types of coils 591 and 592 are wound, winding can be performed while distinguishing them.

It is a disassembled perspective view which shows the structure of the electrically-driven diaphragm | throttle device incorporating the actuator using the coil bobbin of embodiment of this invention as an aperture blade drive means. It is a perspective view which shows the structure of the aperture board | substrate in the same electric aperture device. It is a top view which shows the structure of the aperture_diaphragm | restriction board | substrate. It is a disassembled perspective view which shows the structure of the actuator of the same electric aperture device. It is a disassembled perspective view which shows the structure of the main body unit of the actuator. It is a perspective view which shows the external appearance of the bobbin unit (coil bobbin which incorporated the rotor inside) which is the state before the coil winding of the main body unit. It is a perspective view which shows the external appearance of the other side of the bobbin unit. It is a longitudinal cross-sectional view of the bobbin unit. It is a perspective view for explanation of a method of aligning bobbin units with a fixed direction when winding a coil around the bobbin unit. It is a perspective view for demonstrating the method in the case of removing the bobbin unit which does not align with appropriate directionality. It is the perspective view seen from the front of the chuck device which chucks the bobbin unit properly aligned. It is a perspective view which shows the relationship between the chuck device and a bobbin unit. It is a perspective view which shows the state which hold | gripped the bobbin unit with the chuck | zipper apparatus. It is a perspective view which shows the state which mounted | wore with the coil winding apparatus with the several bobbin unit hold | gripped with the chuck | zipper apparatus. (A) is sectional drawing which shows the structure of the coil winding groove | channel of the bobbin unit, (b) is sectional drawing which shows the state which wound the coil in the coil winding groove | channel. It is a perspective view which shows the completion state of the same electric aperture device. It is a schematic longitudinal cross-sectional view which cuts and shows the actuator attaching part in the completion state by two specific planes. It is a schematic longitudinal cross-sectional view which cuts and shows the same part by another plane. It is a perspective view which shows the case where an electric wire is pulled out in the direction different from FIG.

Explanation of symbols

500 Actuator 511 Coil bobbin 520 Upper bobbin (split bobbin)
522 Bearing hole 526 Recess for chucking 528 Coil winding groove 529 Locating protrusion 530 Lower bobbin (divided bobbin)
532 Bearing hole 540 Rotor 541a Shaft end 541b Shaft end 591 Coil (drive side)
592 Coil (braking side)
952 Chuck claw

Claims (4)

  It has a substantially hollow cylindrical shape capable of rotatably accommodating a rotor inside, and has a coil winding groove on the outer surface that can wind a coil in a plane substantially parallel to the axial direction of the rotor, and the coil winding groove A coil bobbin for a small electric actuator, characterized in that a pair of recesses capable of gripping a coil bobbin by engaging a pair of chuck claws are provided on at least one outer periphery of both sides sandwiched. A coil bobbin for a small electric actuator according to claim 1,
A coil bobbin for a small electric actuator, wherein the coil bobbin is divided into two in the axial direction of the rotor, and each of the divided bobbins is provided with a bearing hole for rotatably fitting the shaft end of the rotor. In a method for manufacturing a small electric actuator including a step of winding a coil on the outer periphery of a coil bobbin,
Accommodating the rotor inside the coil bobbin according to claim 1 or 2,
After the step, the step of gripping the coil bobbin by engaging a pair of chuck claws with a recess provided on the outer periphery of the coil bobbin;
Winding the coil around the coil winding groove while rotating the coil bobbin while being gripped by the chuck claw;
A method of manufacturing a small electric actuator, comprising: It is a manufacturing method of the small electric actuator according to claim 3,
Protruding pieces for detecting directionality are provided on the outer periphery of only one side of both sides of the coil winding groove of the coil bobbin, and they are arranged in the same direction while detecting the presence or absence of the protruding pieces with an alignment device. A method of manufacturing a small electric actuator, comprising preparing a coil bobbin on an alignment device and holding the prepared coil bobbin with the chuck claw.

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