JP2015106995A - Holder and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new technology which fixes a choke coil to a holder with an adhesive.SOLUTION: A holder houses an element used to operate a motor. The holder includes: a housing part 36 which houses the element; a processing region 38 in which processing is performed to the element; and a guiding passage 40 which guides an adhesive used when the element is fixed to the housing part 36. The guiding passage 40 is formed in a region of the housing part 36 that is opposite to the processing region 38. The guiding passage 40 may have a recessed part 44 formed in a part of a bottom surface 36a of the housing part 36.

Description

  The present invention relates to a holder for storing an element used for operation of a motor, and a motor including the holder.

  Conventionally, motors have been used as drive sources for various devices and products. In addition, with the development and spread of wireless technology, there is an increasing demand for suppression of electrical noise generated by these motors. Therefore, a motor in which an element for suppressing electrical noise is mounted on a brush holder has been devised.

  For example, a small motor in which a choke coil is housed in a recess formed in an end bell is known (see Patent Document 1). When assembling this small motor, after the choke coil is inserted into the choke coil housing recess, the choke coil housing recess is filled with an adhesive, and the choke coil is fixed to the end bell.

Japanese Utility Model Publication No. 4-124591

  However, since the adhesive is a fluid, when the choke coil is fixed with the adhesive, it is not easy to accurately control the filling amount and application position of the adhesive, which may cause the adhesive to protrude and insufficient adhesive force. is there.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a new technique for fixing a choke coil to a holder with an adhesive.

  In order to solve the above-mentioned problem, a holder according to an aspect of the present invention is a holder for storing an element used for the operation of a motor, a storage part for storing the element, a processing region in which processing for the element is performed, A guide path for guiding the adhesive used when the element is fixed to the housing portion. The guide path is formed in a region on the opposite side of the processing region of the accommodating portion.

  Here, the accommodating part may be cylindrical. The cylindrical shape may be either cylindrical or non-cylindrical. Examples of the element include passive elements such as a choke coil, a capacitor, and a varistor. Further, the processing region can be regarded as a region where processing by electrical connection of elements or processing accompanied by physical deformation of elements is performed. According to this aspect, since the induced adhesive is directed to the guide path on the opposite side to the processing region, it is difficult for the adhesive to face the processing region. Therefore, the occurrence of problems caused by the adhesive can be reduced when the element is processed in the processing region.

  The guide path may have a recess formed in a part of the bottom surface of the housing portion. As a result, the adhesive can be more easily guided to the guide path.

  The recess may be formed at a position where the center of the recess is deviated from the center of the bottom surface, up to the inner peripheral surface of the housing portion. Thereby, when fixing an element to an accommodating part with an adhesive agent, an adhesive agent can be biased. Moreover, an adhesive agent can be guide | induced to the internal peripheral surface of an accommodating part.

  The recess may be formed so as not to overlap the center of the bottom surface. Thereby, the element can be stably held on the bottom surface.

  The accommodating part may have a circular inner peripheral surface. The recess may have an arcuate inner peripheral surface.

  The guide path communicates with the inner peripheral surface of the recess and may have a longitudinal groove formed in the inner wall of the housing portion. As a result, the adhesive is easily filled in the longitudinal grooves.

  You may further provide the choke coil accommodated in an accommodating part as an element. The longitudinal groove may be twice or more the wire diameter of the choke coil. Thereby, it is possible to fill the flutes with a sufficient amount of adhesive to fix the element.

  You may further provide the choke coil accommodated in an accommodating part as an element, and the adhesive agent which fixes a choke coil to an accommodating part. The adhesive may fill at least a part of the guide path. Thereby, the choke coil is fixed to the housing portion by the adhesive of the guide path.

  The processing area may be an area where a terminal electrically connected to the choke coil is installed. Thereby, the situation where the operation | work at the time of connecting a choke coil and a terminal is prevented with an adhesive agent can be suppressed.

  The accommodating part may be formed with a slit into which one end of the choke coil is inserted between the processing region. Thereby, a choke coil can be temporarily fixed easily.

  Another embodiment of the present invention is a motor. This motor includes a rotor, a cylindrical yoke housing that houses the rotor, and a holder that is attached to an opening of the yoke housing.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the new technique which fixes a choke coil to a holder with an adhesive agent is realizable.

It is a front view of the motor concerning this embodiment. It is sectional drawing of the motor which concerns on this Embodiment. It is the front view which looked at the brush holder shown in FIG. 2 from the rotor side. It is a perspective view of the accommodating part vicinity of the brush holder which concerns on this Embodiment. It is a schematic diagram of the accommodating part vicinity which concerns on this Embodiment. FIG. 6A is an enlarged schematic view in the vicinity of the accommodating portion, and FIG. 6B is a cross-sectional view taken along the line AA in FIG. FIG. 7A is a schematic diagram illustrating a state in which the housing portion is filled with an adhesive, and FIG. 7B is a schematic diagram illustrating a state in which a choke coil having a ferrite core is inserted and fixed in the housing portion. . FIG. 8A is a schematic diagram showing a state in which the choke coil is placed in the housing portion and the central portion is filled with the adhesive, and FIG. 8B is a diagram in which a ferrite core is inserted and fixed in the center of the choke coil. It is a schematic diagram which shows a mode that it does. It is an expansion schematic of the accommodating part vicinity which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Moreover, the structure described below is an illustration and does not limit the scope of the present invention at all.

  FIG. 1 is a front view of the motor according to the present embodiment. FIG. 2 is a cross-sectional view of the motor according to the present embodiment.

  A DC brush motor (hereinafter referred to as “motor”) 10 according to the present embodiment mainly includes a rotor housing 12 as a yoke housing, a rotor 14, a brush holder 16 with a connector, and a metal cover member. And an end plate 18. The rotor housing 12 has an opening 12a at one end and a closed bottom 12b at the other end. The bottom 12b is formed with a recess, and the bearing 17 is accommodated in the recess. An arc-shaped magnet 19 is disposed on the inner wall of the rotor housing 12.

  The rotor 14 includes a shaft 20, a core 22, a winding 24, and a commutator (commutator) 26. The shaft 20 is a rotating shaft that supports the rotor 14 via the bearing 17 and the bearing 28. The shaft 20 also functions as an output shaft. The bearing 28 is accommodated in a recess formed in the central portion of the end plate 18. The core 22 is formed by laminating a plurality of steel plates, and the shaft 20 is fixed in a state where the shaft 20 passes through the core 22. The winding 24 is wound around the groove 22a of the core 22, and generates a magnetic force when a current flows.

  The commutator 26 is fixed to the shaft 20 similarly to the core 22. The commutator 26 is a contact that allows a current supplied through a brush (not shown) to contact the coil 24 to flow through the winding 24 at an appropriate timing. The brush is, for example, a fork-shaped carbon brush mainly composed of carbon. In addition, a brush may have a precious metal etc. as a main component.

  The brush holder 16 is attached to the opening 12a of the cylindrical rotor housing 12 in which the rotor 14 is accommodated, and a power supply path to the rotor 14 via the brush is provided. In the middle of the power supply path, a noise suppression element such as a choke coil 32, a capacitor, or a varistor is mounted, and a circuit board 34 on which wirings connecting the elements are formed on the surface is provided.

  The brush holder 16 is provided in a circular lid portion 16a corresponding to the shape of the opening 12a of the rotor housing 12 and a position projecting in the radial direction from the outer edge portion of the lid portion 16a, and current is supplied from an external power source. And a connector portion 16b to which a power feeding terminal is connected. Input terminals (terminals) 35a and 35b are provided inside the connector portion 16b.

  FIG. 3 is a front view of the brush holder 16 shown in FIG. 2 as viewed from the rotor 14 side. FIG. 4 is a perspective view of the vicinity of the accommodating portion of the brush holder according to the present embodiment. FIG. 5 is a schematic view of the vicinity of the accommodating portion according to the present embodiment.

  The brush holder 16 shown in FIG. 3 is a part that is integrally molded into a predetermined shape using a resin material. Two cylindrical accommodating portions 36 for accommodating the choke coils 32 are formed on the lid portion 16 a of the brush holder 16. The choke coil 32 is a kind of element used for the operation of the motor 10 and is mainly used for suppressing electrical noise. Further, the choke coil 32 is a cylindrical part in which, for example, a metal wire is spirally wound. Further, the cylindrical choke coil 32 according to the present embodiment has a columnar ferrite core 42 inserted and fixed at the center thereof.

  The choke coil 32 and the ferrite core 42 need to be fixed with an adhesive in the accommodating portion 36 so that the choke coil 32 and the ferrite core 42 are not dropped from a predetermined position due to vibration or dropping. However, the adhesive is often a viscous liquid object, and its shape is difficult to control. Therefore, if the amount of the adhesive is less than the appropriate amount, the choke coil 32 and the ferrite core 42 may not be sufficiently fixed.

  On the other hand, if the amount of the adhesive is larger than the appropriate amount, it may overflow from the storage portion 36 and reach another area that is not originally required. In the present embodiment, for example, when spot welding the one end 32a of the choke coil 32 to the conduction path of the terminal or the circuit board 34, if the excess adhesive reaches the processing region 38, normal spot welding is hindered. There can be.

  Therefore, the brush holder 16 includes a guide path 40 that guides the adhesive used when the choke coil 32 and the ferrite core 42 are fixed to the housing portion 36. The guide path 40 is formed in a region on the opposite side of the processing region 38 of the accommodating portion 36. As a result, the guided adhesive is directed to the guide path 40 on the side opposite to the processing region 38, so that it is difficult for the adhesive to face the processing region 38. Therefore, when processing, for example, spot welding, is performed on the one end 32a of the choke coil 32 in the processing region 38, occurrence of problems due to the presence of the adhesive can be reduced. In addition, although the accommodating part 36 which concerns on this Embodiment is a cylindrical shape according to the shape of the choke coil 32, a non-cylindrical shape may be sufficient depending on the shape of an element.

  Next, the structure in the vicinity of the accommodating portion will be described in detail. FIG. 6A is an enlarged schematic view in the vicinity of the accommodating portion, and FIG. 6B is a cross-sectional view taken along the line AA in FIG.

  The guide path 40 has a recess 44 formed in a part of the bottom surface 36 a of the housing portion 36. As a result, the adhesive can be more easily guided to the guide path 40.

  Further, as shown in FIG. 6A, the concave portion 44 is formed at a position where the center C1 of the concave portion 44 is shifted with respect to the center C2 of the bottom surface 36a and to the inner peripheral surface 36b of the accommodating portion 36. . Thereby, when fixing the choke coil 32 and the ferrite core 42 to the accommodating part 36 with an adhesive agent, an adhesive agent can be biased. Further, the adhesive can be guided to the inner peripheral surface 36b of the housing portion 36.

  The recess 44 is formed so as not to overlap the center C2 of the bottom surface 36a. That is, the recess 44 is a region that is less than half of the bottom surface 36a. Thereby, the choke coil 32 can be stably held by the bottom surface 36a. The inner peripheral surface 36b of the cylindrical accommodating portion 36 is circular. The recess 44 has an arc-shaped inner peripheral surface 36c.

  The guide path 40 has a longitudinal groove 46 that communicates with the inner peripheral surface 36 b and the inner peripheral surface 36 c of the recess 44. The vertical groove 46 is formed on the inner peripheral surface 36 b of the accommodating portion 36. This makes it easier for the adhesive to fill the longitudinal grooves 46.

  Note that the housing portion 36 usually fixes the choke coil 32 along the shape of the inner peripheral surface 36 b, but also when the choke coil having a smaller diameter than the choke coil 32 that fits into the recess 44 is fixed. Can be used. That is, the accommodating portion 36 can fix a plurality of types of choke coils having different diameters without changing the shape. Moreover, you may form the recessed part 44 in multiple steps instead of one step. In this case, the accommodating portion can cope with more types of choke coils having different diameters.

  7A is a schematic diagram showing a state in which the accommodating portion 36 is filled with the adhesive 48, and FIG. 7B is a state in which the choke coil 32 having the ferrite core 42 is inserted into the accommodating portion 36 and fixed. It is a schematic diagram shown.

  As shown in FIG. 7A, first, an adhesive 48 is filled into the bottom surface 36 a of the housing portion 36. Next, when the choke coil 32 having the ferrite core 42 fixed at the center is inserted from above, the adhesive 48 is pushed out into the recess 44 of the guide path 40 to fill the recess 44, and then the remaining adhesive 48 is removed. It moves along the vertical groove 46 to the upper part. That is, the adhesive 48 can be intentionally guided to a region opposite to the processing region 38.

  In addition, since the adhesive 48 wraps around not only at the bottom portion but also at the side surface of the choke coil 32, the choke coil 32 is firmly fixed to the housing portion 36, and the motor is less likely to drop off due to vibration or dropping. Further, since the vertical groove 46 functions as a escape path for the adhesive 48, even if the adhesive 48 is larger than a predetermined amount, it is difficult to overflow from the accommodating portion 36. Note that the width W1 and the width W2 (see FIG. 6A) of the vertical groove 46 are twice or more the wire diameter R of the choke coil 32 (see FIG. 7A). More preferably, at least one of the width W1 and the width W2 is set to be three times or more. Thus, the longitudinal groove 46 can be filled with a sufficient amount of the adhesive 48 for fixing the choke coil 32.

  Thus, the adhesive 48 fills at least a part of the induction path 40, and the choke coil 32 is fixed to the housing portion 36 by the adhesive 48 in the induction path 40.

  As shown in FIGS. 3 and 5, the processing region 38 according to the present embodiment is a region where a terminal electrically connected to the choke coil 32 is installed or a region in the vicinity thereof (region 50). Thereby, the situation where the operation | work at the time of connecting the choke coil 32 and a terminal is prevented with an adhesive agent can be suppressed.

  Further, a slit 52 into which one end 32 a of the choke coil 32 is inserted is formed between the housing portion 36 and the processing region 38. As a result, the choke coil 32 can be easily temporarily secured, so that the choke coil 32 can be prevented from being displaced until the adhesive 48 is hardened. The slit 52 is provided below (inside) the upper surface of the brush holder 16 so that one end 32 a of the temporarily secured choke coil 32 does not protrude from the upper surface of the brush holder 16.

  Next, a modified example of the method for fixing the choke coil to the housing portion will be described. FIG. 8A is a schematic diagram showing a state in which the choke coil 32 is placed in the accommodating portion 36 and the center portion thereof is filled with the adhesive 48, and FIG. 8B is a diagram illustrating the ferrite core 42 of the choke coil 32. It is a schematic diagram which shows a mode that it inserts in the center and fixes.

  As shown in FIG. 8A, first, the choke coil 32 is placed on the bottom surface 36 a of the housing portion 36, and the adhesive 48 is filled in the central portion thereof. Next, when the ferrite core 42 is inserted from above the choke coil 32, the adhesive 48 is pushed out into the concave portion 44 of the induction path 40 to fill the concave portion 44, and then the surplus adhesive 48 travels through the vertical groove 46. Move to the top. At this time, the adhesive 48 simultaneously fills a part of the gap between the ferrite core 42 and the inner peripheral portion of the choke coil 32. Thereby, it is not necessary to fix the choke coil 32 and the ferrite core 42 to each other in advance, and the choke coil 32 and the ferrite core 42 can be fixed to the housing portion 36 in a single process. As a result, the cost can be reduced by simplifying the manufacturing process and reducing the adhesive used.

  Next, a modification of the concave portion of the guide path will be described. FIG. 9 is an enlarged schematic view of the vicinity of the accommodating portion according to the modification.

  The guide path 56 of the accommodating portion 54 shown in FIG. 9 is the same as the guide path 40 in that it has a recess 58 and a longitudinal groove 46, but the shape of the recess 58 is different. Specifically, the concave portion 58 has a smaller diameter than the bottom surface 54 a of the accommodating portion 54 and a substantially concentric shape. Accordingly, the accommodating portion 54 can guide the adhesive 48 in a wider range toward the vertical groove 46 while reliably supporting the bottom portion of the cylindrical choke coil 32 with the bottom surface 54a.

  The accommodating portion 36 has a recess 44 that is one step deeper on the bottom surface 36 a as the guide path 40, and is configured to guide the adhesive 48 to the vertical groove 46 via the recess 44. In contrast to this configuration, a groove is formed in the bottom of the ferrite core 42 in the modification. Then, by placing the ferrite core 42 on the bottom surface 36a of the accommodating portion 36 so that the groove faces the longitudinal groove 46 of the accommodating portion 36, the extruded adhesive 48 is intentionally placed on the longitudinal groove 46 side, that is, It can be directed to a region opposite to the processing region 38. In this case, it is not necessary to provide the recessed part 44 in the accommodating part 36, and the shape of the accommodating part 36 can be simplified. The groove at the bottom of the ferrite core 42 does not need to be formed over the entire diametrical direction, but may be formed in a region of a radial portion from the center of the bottom toward the vertical groove 46. Further, a hollow portion (concave portion) in which the adhesive 48 is accumulated at the bottom of the ferrite core 42 may be formed.

  As described above, the present invention has been described with reference to the above-described embodiment. However, the present invention is not limited to the above-described embodiment, and the present invention can be appropriately combined or replaced with the configuration of the embodiment. It is included in the present invention. In addition, it is possible to appropriately change the combination and processing order in the embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to the embodiment. The described embodiments can also be included in the scope of the present invention.

  10 motor, 12 rotor housing, 14 rotor, 16 brush holder, 16a lid, 16b connector, 19 magnet, 22 core, 24 windings, 26 commutator, 32 choke coil, 32a one end, 36 accommodating portion, 36a bottom surface, 36b Inner peripheral surface, 36c Inner peripheral surface, 38 processing region, 40 guide path, 42 ferrite core, 44 recess, 46 longitudinal groove, 48 adhesive, 52 slit, 54 accommodating portion, 54a bottom surface, 56 guide path, 58 recess.

Claims (11)

A holder for storing an element used for operation of a motor,
An accommodating portion for accommodating the element;
A processing region where processing of the element is performed;
A guide path for guiding the adhesive used when fixing the element to the housing portion,
The guide path is formed in a region opposite to the processing region of the housing portion.   The holder according to claim 1, wherein the guide path has a recess formed in a part of a bottom surface of the housing portion.   The holder according to claim 2, wherein the concave portion is formed at a position where a center of the concave portion is shifted with respect to a center of the bottom surface and extends to an inner peripheral surface of the housing portion.   The holder according to claim 2 or 3, wherein the recess is formed so as not to overlap a center of the bottom surface. The accommodating portion has a circular inner peripheral surface,
The recess has an arcuate inner peripheral surface,
The holder according to any one of claims 2 to 4, wherein the holder is provided.   The holder according to any one of claims 2 to 5, wherein the guide path includes a longitudinal groove formed on an inner wall of the housing portion in communication with an inner peripheral surface of the recess. A choke coil accommodated in the accommodating portion as the element;
The holder according to claim 6, wherein the longitudinal groove is twice or more the wire diameter of the choke coil. A choke coil housed in the housing section as the element;
An adhesive for fixing the choke coil to the housing portion,
The holder according to claim 1, wherein the adhesive fills at least a part of the guide path.   The holder according to claim 8, wherein the processing region is a region where a terminal electrically connected to the choke coil is installed.   The holder according to claim 8 or 9, wherein a slit into which one end of the choke coil is inserted is formed between the housing portion and the processing region. A rotor,
A cylindrical yoke housing that houses the rotor;
The holder according to any one of claims 1 to 10, which is attached to an opening of the yoke housing;
With motor.

Images