JP2007318884A - Assembly-type commutator and method of manufacturing assembly- type commutator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembly-type commutator, where a plurality of commutator parts can be arranged and fixed easily in specified positions even if it is a micro commutator by simple constitution and besides the assembly of the commutator is easy, and its manufacturing method. <P>SOLUTION: In a roughly ring-shaped retainer ring 30 where a through hole 31 is made at the center, a plurality of projections 32, on one side, and grooves 33, between these projections 32, are made, and the bases of the riser parts 21 ranging from the commutator parts 20 engage with each other between the projections 31, and the base ends of the commutator parts 20 abut each on the inner face of the through hole 31 of the retainer ring 30. For a holder 10, a flange part 12 is made on its base end side, and the cylindrical part 11 of the holder 10 is threaded into the through hole 31 of the retainer ring 30 via a plurality of commutator parts 20 interposed, and the flange part 12 is pressed against the retainer ring 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an assembly type commutator attached to a rotary electric machine such as a small motor and a method for manufacturing the assembly type commutator.

  Small motors and vibration motors are widely used in various fields such as audio / video equipment, optical precision equipment, and mobile phones, and in recent years, lighter and thinner and higher performance have been promoted. In the small motor, a permanent magnet is mounted inside a casing, and a rotor that is rotatably supported by a bearing is disposed to face the permanent magnet. The rotor is provided with a commutator unit having a commutator portion, and a brush installed in the casing is in sliding contact with the commutator to supply power to the armature winding of the rotor.

  There are two types of commutators: a mold type that integrates the whole with a thermosetting resin and an assembly type that uses a thermoplastic resin for the insulation part. Assembling type commutators are often used for motors.

  As for an assembly type commutator, the structure disclosed by Unexamined-Japanese-Patent No. 2000-92793 (patent document 1) is generally known, for example. 5 is an exploded perspective view showing a conventional assembly type commutator, and FIG. 6 is a cross-sectional view showing a cross section thereof. The commutator includes an insulating base 1 having a flange portion 3 formed at one end of the cylindrical portion 2, three commutator portions 4 made of a conductive metal attached to the insulating base 1, and an outer periphery of the commutator portion 4. And a ring member 5 that presses the commutator portion 4 against the outer peripheral surface of the insulating base 1 and fixes them together. The commutator section 4 is curved in an arc shape and is slidably contacted with a brush of a small motor (not shown). The commutator section 4 has a riser section 4a that is continuously provided radially from one end side. An end portion of an armature winding (not shown) is connected to the riser portion 4a. In such a structure, the means for fixing the plurality of commutator portions 4 to the outer peripheral surface of the insulating base 1 depends on the pressing force of the ring member 5.

  When manufacturing the assembly type commutator, first, the base end of the commutator portion 4 is inserted into the circumferential groove 3a formed in the flange portion 3 of the insulating base 1, and the riser portion 4a is formed into the radial groove 3b. Mating. Thereafter, the ring member 5 is inserted and assembled from the distal end side to the proximal end side of the commutator portion 4.

  As described above, the commutator itself has been miniaturized with the recent miniaturization of small motors and vibration motors. Therefore, even when trying to fit the three smallest commutator portions 4 to the insulating base 1. Since the position is not fixed, it becomes difficult to insert the ring member 5, and the position of the commutator portion 4 is displaced, which causes a problem that the function as the commutator cannot be performed. On the other hand, the ring member 5 is usually made of a material having an electrical insulating function made of a fiber such as paper. Then, after the three commutator portions 4 are mounted on the outer peripheral surface of the insulating base 1, the ring member 5 is inserted from the top end side in the figure and presses each commutator portion 4 against the outer peripheral surface of the insulating base 1. I am trying to fix it in the state. However, when such a dimension of the ring member 5 is changed, there is a serious problem that the pressing force of each commutator portion 4 is changed and the commutator portion 4 is pulled out of the insulating substrate 1 due to vibration or impact. It sometimes occurred.

  In order to avoid the problem of the fixing means as described above, Japanese Patent Laid-Open No. 8-149760 (Patent Publication 2) discloses a means for increasing the fixing strength of the commutator portion to the insulating base without using a ring member. It is disclosed. That is, the assembly type commutator is formed with a plurality of outwardly recessed grooves on the side surface of the flange portion formed in the cylindrical portion, and the recessed grooves are formed outwardly from the three conductive commutator portions. The terminal part for armature winding connection bent toward is stored. And the convex part is provided in the side wall and terminal part of a ditch | groove, and when a terminal part is press-fitted in a ditch | groove, it is comprised so that a terminal part may be latched in the state which the convex part and the side wall deform | transformed. .

JP 2000-92793 A JP-A-8-149760

  According to such an assembly-type commutator disclosed in Patent Document 2, since the terminal portion of the commutator portion is press-fitted into the recessed groove formed in the flange portion, the above-described ring member can be omitted. Become. However, due to variations in dimensional accuracy between the groove formed on the side surface of the flange portion and the terminal portion of the commutator portion, there are those with low press-fitting strength, which may be caused by vibration or dropping that occurs when a small motor rotates. There may be a serious problem that the commutator is pulled out by impact. Also, in the case of an ultra-compact commutator with an outer diameter of 3 mm or less attached to the outer periphery of the cylindrical part, the required press-fitting strength is required because the dimensions of the concave groove and the terminal part of the commutator part are small. As a result, there has been a problem that variation in press-fit strength due to dimensional variation becomes large, and as a result, it cannot be used for an ultra-small assembly type commutator. Furthermore, when manufacturing the above-mentioned ultra-small commutator, the commutator part to be assembled itself is extremely small, so that it is difficult to attach the commutator part at a predetermined position, and many defective products are generated. There is.

  In view of the above, an object of the present invention is to easily arrange and fix a plurality of commutator portions at predetermined positions even with an ultra-small commutator with a simple configuration, and to easily assemble the commutator. An object of the present invention is to provide an assembly type commutator and a manufacturing method thereof.

  In order to solve the above-mentioned problem, the assembly type commutator according to the invention of claim 1 is a cylindrical commutator part having a commutator part formed in an arc shape and a riser part connected to the commutator part. The retainer ring formed in a substantially ring shape with a through hole formed in the center has a plurality of protrusions and a plurality of protrusions on one surface thereof. Grooves are formed between the protrusions, the base portions of the riser portions are engaged between the protrusions, and the base end portions of the commutator portions are brought into contact with the inner surfaces of the through holes of the retainer ring, The holder is formed with a flange portion on the proximal end side, and the cylindrical portion of the holder is inserted into the through hole of the retainer ring with the plurality of commutator portions interposed therebetween, and the flange portion of the holder is inserted into the retainer retainer ring. It is the subject matter that is pressed against the grayed.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the protrusion of the retainer ring is set to a height equal to or less than the plate thickness of the riser portion connected to the commutator portion. .

  Furthermore, the invention according to claim 3 is the invention according to claim 1, wherein a plurality of protrusions having a thickness equal to or less than the plate thickness of the commutator portion are formed to protrude on the inner periphery of the through hole of the retainer ring. Is formed substantially equal to the width of each commutator portion.

  Furthermore, in the invention according to claim 4, each commutator is provided in a cylindrically formed holder having a plurality of commutator portions each having a commutator portion formed in an arc shape and a riser portion connected to the commutator portion. The retainer ring formed in a substantially disc shape in the assembly type commutator, in which a slit is provided between the parts and fixed, and the retainer ring is fitted to the outer periphery of the commutator part and fixed to the outer peripheral surface of the holder. Has a plurality of protrusions on one surface and a groove formed between the protrusions, and the commutator part is fitted into the through hole of the retainer ring, and the riser part of the commutator part is a groove part between the protrusions. The cylindrical portion of the holder is inserted into the insertion hole formed by the inner surfaces of the plurality of commutator portions disposed on the inner surface of the through hole of the retainer ring, and the flange portion of the holder is Retail By pressing on-ring, and a plurality of subject matter a method for manufacturing a fixed assembled commutator of the commutator unit.

  According to the assembly type commutator according to the present invention, the retainer ring formed in a substantially ring shape having a through hole in the center has a plurality of protrusions on one surface and a groove portion between the protrusions. Therefore, the position of each commutator part can be determined by the retainer ring by engaging the base part of the riser part between the protrusions. Further, the base end portion of the commutator portion is brought into contact with the inner surface of the through hole of the retainer ring, and the cylindrical portion of the holder having a flange portion formed on the base end side is inserted into the through hole of the retainer ring. As a result, each commutator portion is fixed between the inner surface of the retainer ring and the cylindrical portion of the holder, so that separation in the radial direction is reliably prevented, and the flange portion of the holder is pressed against the retainer ring. This prevents the commutator portions from being detached in the axial direction, so that even if the commutator is extremely small, it is possible to provide a highly accurate commutator in which positional deviation is suppressed.

  In addition, since the height of the retainer ring protrusion is set to be equal to or less than the plate thickness of the riser portion connected to the commutator portion, when the flange portion of the holder is pressed against the retainer ring, the riser portion Since it is pressed, displacement of the commutator portion in the axial direction can be prevented.

  Further, a plurality of protrusions are formed on the inner periphery of the through hole of the retainer ring so that the height is equal to or less than the plate thickness of the commutator portion and the distance between the inner surfaces is substantially equal to the width of the commutator portion. By doing so, it is possible to accurately maintain the interval between the slits formed between the commutator portions even when the commutator is vibrated.

  According to the manufacturing method of the assembly type commutator according to the present invention, the commutator portion is inserted into the inner surface of the retainer ring through-hole, and the riser portion of the commutator portion is inserted into the groove between the protrusions formed on one surface. By fitting, slits with a predetermined interval can be easily formed between the commutator portions. From this state, the cylindrical portion of the holder is inserted into the insertion hole formed by the inner surfaces of the plurality of commutator portions disposed on the inner surface of the through hole of the retainer ring, and the flange portion of the holder is further inserted into the retainer. By pressing against the ring, the plurality of commutator portions can be fixed at predetermined positions, and the commutator can be easily assembled.

  The assembly type commutator is configured such that a plurality of commutator portions each having a commutator portion formed in an arc shape and a riser portion connected to the commutator portion are rectified with respect to the outer peripheral surface of the insulating base formed in a cylindrical shape. A slit is provided between the child parts, the arrangement is fixed, and a ring member is fitted on the outer periphery of the commutator part, and is pressed and fixed to the outer peripheral surface of the insulating base. In this assembled commutator, the retainer ring is formed in a substantially ring shape with a through hole formed in the center, and a plurality of protrusions and a groove portion are formed between the protrusions on one surface. A base portion of a riser portion connected to the commutator portion is engaged between the protrusions, and a base end portion of the commutator portion is brought into contact with an inner surface of the through hole of the retainer ring. The holder has a flange portion on the base end side. And the cylindrical part of a holder is inserted in the through-hole of a retainer ring, a some commutator part is interposed, and also the flange part of a holder is pressed on a retainer ring. Accordingly, the plurality of commutator portions are fixedly pressed to the inner surface and the outer peripheral surface of the cylindrical portion of the holder with the base end portion of the retainer ring through-hole, and the riser portion connected to the commutator portion is formed by the protrusion of the retainer ring. It is fixed by the flange part of the holder in a state of being engaged therebetween.

  1 is a cross-sectional view of an assembly type commutator according to an embodiment of the present invention, FIG. 2 is a left side view of the commutator in FIG. 1, and FIG. 3 is a perspective view of a retainer ring. As shown in FIG. 1, the assembly type commutator includes a holder 10 made of an insulating material made of a synthetic resin formed in a cylindrical shape, and a plurality of rectifiers made of a conductive metal and attached to the outer periphery of the holder 10. It is comprised by the child part 20 and the retainer ring 30 inserted in the outer periphery of the commutator part 20 and positioning and fixing the commutator part 20.

  The holder 10 is made of an engineering plastic having a small coefficient of thermal expansion or a change with time, such as a synthetic resin such as polyamide 9T resin or polybutylene terephthalate (PBT). The holder 10 is formed by a molding means such as injection molding using a predetermined mold using these resins.

  In the holder 10, a cylindrical portion 11 and a flange portion 12 having a larger diameter than the cylindrical portion 11 are integrally formed on the base end side, and a rotation shaft (not shown) is inserted into the central shaft hole 13.

  The retainer ring 30 is made of an engineering plastic having a small coefficient of thermal expansion and a change with time, and is formed by a predetermined molding die, for example, by molding means such as injection molding. As shown in FIG. 3, the retainer ring 30 is formed in a substantially flat plate shape, and a through hole 31 is formed in the center. Then, on one surface of the retainer ring 30, projections 32 are formed at equal intervals of about 120 degrees in the circumferential direction, and groove portions 33 are formed between these projections 32. The height of the protrusion 32 is set to a dimension equal to or smaller than the plate thickness of the riser portion 21 connected to the commutator portion 20, that is, the same as the plate thickness of the riser portion 21 or smaller than the plate thickness. In addition, on the inner periphery of the through hole 31, three protrusions 34 are integrally formed at regular intervals of 120 degrees. The distance between the circumferential side surfaces of the protrusions 34 is set to be substantially equal to the width of the commutator portion 20, and the circumferential width of the protrusions 34 is a slit formed between the commutator portions 20. The width S is set to 23 (see FIG. 4D).

  The commutator portion 20 is formed in an arc shape so as to be in sliding contact with a brush disposed in a rotary electric machine such as a small motor (not shown). From one end side of the commutator portion 20, a riser portion 21 that is bent toward the outer side in the radial direction is continuously provided. The commutator portion 20 is made of a clad material in which copper is used as a base material and a thin contact material such as Ag-Cu is embedded in a portion that is in sliding contact with the brush. Further, the commutator portion 20 has a curvature radius that matches the outer peripheral surface of the cylindrical portion 11 of the holder 10, and the width thereof is a predetermined width S between the adjacent commutator portions 20 when attached to the holder 10. The slits 23 are set to be formed. Note that an armature winding (not shown) is connected to the riser unit 21.

  And between the three protrusions 34 projectingly formed on the inner periphery of the through hole 31 of the retainer ring 30, the side surfaces of the respective commutator portions 21 are engaged so as to come into contact with one side surface. The relative position is determined by fitting the riser portion 21 of each commutator portion 20 into the groove portion 33 formed between the plurality of formed protrusions 32. Further, by inserting the cylindrical portion 11 of the holder 10 through the through hole 31 of the retainer ring 30, the plurality of commutator portions 20 are disposed between the inner surface of the through hole 31 of the retainer ring 30 and the outer surface of the cylindrical portion 11 of the holder 10. It is interposed between the two. Further, by pressing the flange portion 11 of the holder 10 against the retainer ring 30, the riser portions 21 of the plurality of commutator portions 20 are fixed in a sandwiched state.

  At this time, the height of the protrusion 32 is set to a dimension equal to or smaller than the plate thickness of the riser unit 21 connected to the commutator unit 20, that is, the same as or smaller than the plate thickness of the riser unit 21. Thus, since the riser portion 21 protrudes from the protrusion 32, the commutator portion 20 is clamped and fixed when the flange portion 11 of the holder 10 is pressed, so that displacement in the thrust direction is prevented. As described above, the three commutator portions 20 are fixed by the holder 10 and the retainer ring 30 in a state where the proximal end portion and the riser portion 21 are positioned. In addition, although the protrusion 34 was formed in the inner periphery of the through-hole 31 of the retainer ring 30, this protrusion 34 can be abbreviate | omitted.

  Next, the manufacturing method of the assembly type commutator which consists of this invention is demonstrated based on FIG. As shown in FIGS. 4A and 4B, the three commutator portions 20 are fitted into the groove portions 33 of the retainer ring 30. Thereby, each commutator part 20 is positioned by the riser part 21 by the groove part 33 of the retainer ring 30, and the commutator part 20 is positioned by the three protrusions 34 formed to protrude from the inner surface of the retainer ring 30. Thereby, it is temporarily fixed in a state where the relative position is determined.

  Next, as shown in FIG. 4C, the cylindrical portion 11 of the holder 10 is inserted into the insertion hole 50 formed by the inner surfaces of the three commutator portions 20, and the retainer ring 30 is attached to the flange portion 11 of the holder. Press to.

  Thereby, the three commutator parts 20 are fixed in a state where the base end part and the riser part 21 are positioned by the holder 10 and the retainer ring 30, and the commutator is manufactured. In the manufacturing method described above, when manufacturing an ultra-compact assembly type commutator, an assembly jig (not shown) may be used because the retainer ring 30 and the commutator unit 20 are extremely small. preferable.

  Incidentally, in the assembly type commutator described above, the outer diameter of the three commutator portions 20 arranged in a cylindrical shape is about 0.7 mm to 2.0 mm, and about 0.3 mm to 1.5 mm. It is fitted and fixed to a rotation shaft with a minimum diameter. Even such an ultra-small assembly type commutator can be easily manufactured. In addition, a plurality of protrusions 32 are formed on one surface of the retainer ring 30, a groove portion 33 is formed between the protrusions 32, and the plurality of commutator portions 20 are inserted from one surface side to insert the riser portion 21 into the groove portion 33. After that, the plurality of commutator portions 20 and the holder 10 can be performed from one surface side of the retainer ring 30 such that the cylindrical portion 11 of the holder 10 is inserted from one surface side of the retainer ring 30. There exists the characteristic which can simplify a process.

  Although the present invention has been specifically described above based on the embodiments, it is needless to say that the present invention is not limited to the above embodiments and can be variously modified without departing from the gist thereof. For example, in the embodiment described above, a three-pole assembly type commutator having three commutator units is used, but a multi-pole assembly type commutator having four or more commutator units may be used. Further, the shape of the retainer ring may be appropriately modified. Furthermore, when the strength of the flange portion of the holder and the retainer ring is insufficient, other fixing means such as adhesion or welding may be used in combination.

It is sectional drawing of the assembly-type commutator concerning this invention. It is a left view in FIG. It is a perspective view of the retainer ring concerning the present invention. (A) thru | or (D) show the manufacturing process of the assembly-type commutator concerning this invention, (A) is a perspective view which shows the process of arrange | positioning a retainer ring to an assembly jig, (B) is two or more in a retainer ring. The perspective view which shows the process of fixing the commutator part of this, (C) is a perspective view which shows the state which fixed several commutator parts, (D) is a perspective view which shows the process of inserting a holder. It is the disassembled perspective view which showed the structure of the conventional assembly type commutator. It is sectional drawing which showed the structure of the conventional assembly type commutator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Holder 11 Cylindrical part 12 Flange part 20 Commutator part 21 Riser part 23 Slit 30 Retainer ring 31 Through-hole 32 Projection 33 Groove part 34 Projection 50 Insertion hole

Claims (4)

Assembling-type rectification in which a plurality of commutator sections having a commutator section formed in an arc shape and a riser section connected to the commutator section are arranged and fixed by providing slits on the outer peripheral surface of a cylindrical holder In the child
In the retainer ring formed in a substantially ring shape with a through hole formed in the center, a plurality of protrusions and a groove portion are formed between the protrusions on one surface,
While engaging the base part of the riser part between the protrusions, the base end part of the commutator part is brought into contact with the inner surface of the through hole of the retainer ring,
The holder is formed with a flange on the base end side,
Assembling-type rectification characterized in that a plurality of commutator portions are interposed in the through holes of the retainer ring so that the cylindrical portion of the holder is inserted, and the flange portion of the holder is pressed against the retainer ring. Child.   The assembly type commutator according to claim 1, wherein the protrusion of the retainer ring is set to a height equal to or less than a plate thickness of a riser portion connected to the commutator portion.   2. A plurality of protrusions having a thickness equal to or less than the thickness of the commutator portion are formed on the inner periphery of the through hole of the retainer ring, and each interval is formed substantially equal to the width of each commutator portion. The assembly type commutator described in 1. A plurality of commutator parts having a commutator part formed in an arc shape and a riser part connected to the commutator part are disposed and fixed in a cylindrical holder by providing slits between the commutator parts. In the assembly type commutator formed by fitting a ring to the outer periphery of the commutator part and fixing it to the outer peripheral surface of the holder,
The retainer ring formed in a substantially disk shape has a plurality of protrusions on one side and a groove formed between the protrusions,
After fitting the commutator portions into the through holes of the retainer ring and engaging the riser portions of the commutator portions with the grooves between the protrusions,
The cylindrical portion of the holder is inserted into the insertion hole formed by the inner surfaces of the plurality of commutator portions disposed on the inner surface of the through hole of the retainer ring, and the flange portion of the holder is pressed against the retainer ring. The manufacturing method of the assembly-type commutator which fixed the said some commutator part.

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