JP2007104851A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor that fixes a brush holder to a housing easily and at low cost, while keeping water proofing property around the brush holder. <P>SOLUTION: In an electric fan motor 10, the brush holder 46 is provided with a flange portion 54 on the side of a stator magnet 62 from a passing hole 34 of an end housing 16. An O ring 56 is inserted between the flange portion 54 and the peripheral portion of the passing hole 34. By making the flange portion 54 pressed to the side of the end housing 16 by the stator magnet 62, the brush holder 46 is fixed to the end housing 16 via the O ring 56. By making the flange portion 54 pressed to the side of the end housing 16 by the stator magnet 62, the O ring 56 is pressed by the peripheral portion of the passing hole 34 and the flange portion 54. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor, and more particularly, to an electric motor in which a brush holder is inserted into a through hole formed in a housing.

  The following are known as this type of electric motor (see, for example, Patent Document 1). For example, in the electric fan motor described in Patent Document 1, a rotor is rotatably accommodated in a housing, and an output shaft that projects out of the housing from an opening is integrally fixed to the rotor. Further, a printed coil is coaxially provided on the rotor, and a brush is pressed against the printed coil, and power is supplied from the brush. The brush is accommodated in a brush holder, and this brush holder is inserted and fixed in a through hole formed in the housing.

By the way, as shown in Patent Document 1, when this type of electric motor is applied to, for example, a radiator cooling system, it is expected that the electric motor will get wet. Therefore, in order to prevent water droplets from entering the housing through the through hole into which the brush holder is inserted, it is necessary to adopt a waterproof structure for the through hole into which the brush holder is inserted. Therefore, in the conventional electric motor, as this type of waterproof structure, for example, the brush holder is bonded to the peripheral portion of the through hole, or the brush holder is riveted to the housing by assembling an O-ring to the brush holder. .
JP 2000-156506 A

  However, as described above, when the brush holder is bonded to the peripheral portion of the through-hole, the number of man-hours for applying the adhesive and drying the adhesive increases, and each facility for bonding and drying is necessary. Along with these, costs increase.

  Similarly, when an O-ring is assembled to the brush holder and the brush holder is riveted to the housing, the number of parts associated with the rivet and the man-hour for caulking the rivet are increased, and equipment for caulking the rivet is required. As a result, costs increase.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a brush that secures waterproofness around the brush holder in an electric motor in which the brush holder is inserted into a through hole formed in the housing. An object of the present invention is to provide an electric motor capable of fixing a holder to a housing easily and at low cost.

  In order to solve the above-mentioned problem, an electric motor according to claim 1 is provided with a disc type rotor mounted on an output shaft and rotating integrally with the output shaft, a housing for accommodating the disc type rotor, and the disc type A surface facing the rotor in the rotational axis direction and a surface opposite to the surface facing the disk-shaped rotor is inserted into a stator magnet mounted on the housing, and a through hole formed in the housing, and the through hole A brush holder provided with a flange portion in which a seal member is inserted between the stator magnet side and a peripheral edge portion of the through hole, and is pressed against the disk-type rotor and accommodated in the brush holder. A brush, and the seal member is configured such that the flange portion is pressed against the housing side by the stator magnet so that the peripheral portion of the through hole and the flange Characterized in that it is compressed by the Department.

  Thus, in the electric motor according to the first aspect, the brush holder includes the flange portion on the stator magnet side of the through hole, and the seal member is interposed between the flange portion and the peripheral portion of the through hole. It is inserted. Further, the seal member is pressed by the peripheral edge portion of the through hole and the flange portion by pressing the flange portion toward the housing side by the stator magnet. Therefore, the seal member is pressed by the peripheral edge portion and the flange portion of the through hole, so that the waterproof property around the brush holder is ensured, that is, foreign matter such as water droplets enters the inside of the housing from the outside through the through hole. Can be prevented.

  In the electric motor according to the first aspect, the brush holder is fixed to the housing via the seal member by pressing the flange portion toward the housing by the stator magnet. Therefore, the brush holder can be fixed to the housing easily and at low cost without using an adhesive or rivets.

  At this time, like the electric motor according to the second aspect, the brush holder is more specifically configured to include a brush box portion that accommodates the brush. In this case, the flange portion is formed in a shape surrounding the brush box portion, and the seal member is formed of an O-ring formed along the shape of the flange portion. If comprised in this way, even if a brush holder is a structure provided with the brush box part which accommodates a brush, the waterproofness around a brush box part can be ensured reliably by a flange part and an O-ring.

  Further, as in the electric motor according to claim 3, when a wall portion protruding from the flange portion to the O-ring side is formed outside the O-ring of the flange portion, this wall portion is removed from the O-ring. In order to play the role of prevention, the wall part prevents the O-ring from moving to the outside of the flange part. Thereby, it can prevent that the waterproofness around a brush box part falls.

  Furthermore, as in the electric motor according to the fourth aspect, when the stator magnet is fixed to the housing with an adhesive, the stator magnet can be easily assembled to the housing. In addition, when the attractive force of the stator magnet to the housing at this time is set to be stronger than the reaction force that presses the stator magnet through the flange portion of the O-ring, an adhesive that fixes the stator magnet to the housing It is possible to prevent creep destruction due to a reaction force that presses the stator magnet via the flange portion of the O-ring.

  As in the electric motor according to the fifth aspect, a radiator cooling fan may be attached to the output shaft. That is, since the electric motor of the present invention is waterproof, it can be suitably used as a fan motor for cooling the radiator.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that members, arrangements, and the like described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

  First, the configuration of an electric fan motor 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  The electric fan motor 10 of this embodiment is used suitably for the cooling system of a radiator, for example. As shown in FIG. 1, the electric fan motor 10 includes a housing 12, and the housing 12 includes a housing main body 14 and an end housing 16. The housing body 14 and the end housing 16 are assembled by, for example, press-fitting the outer peripheral surface of the end housing 16 into the inner peripheral surface of the housing main body 14.

  A bearing housing portion 18 is formed in the center of the housing body 14 on the side opposite to the end housing 16, and a bearing member 20 is housed in the bearing housing portion 18. On the other hand, a bearing accommodating portion 22 is also formed in the center of the end housing 16, and a bearing member 24 is accommodated in the bearing accommodating portion 22. An output shaft 26 is fixed to the bearing members 20 and 24, so that the output shaft 26 is rotatable. One end of the output shaft 26 projects outwardly from an opening 28 formed in the housing body 14, and a projection 30, which projects outwardly from the housing body 14 of the output shaft 26, has a radiator cooling fan (not shown). Is fixed.

  An insertion portion 32 into which a flange portion 54 of a brush holder 46 described later is inserted is formed at a position away from the rotation axis of the end housing 16, and the brush holder is located at the center position of the insertion portion 32. A through hole 34 into which 46 brush box portions 48 are inserted is formed penetrating in the plate thickness direction. The end housing 16 is formed with a flat portion 36 along the radial direction on which a stator magnet 62 described later is mounted.

  A disc-shaped rotor 38 is rotatably accommodated in the housing 12. The disc type rotor 38 is constituted by a rotor main body 40 and a printed coil 42. A fixing portion 44 is formed at the center of the rotor main body 40, and the output shaft 26 is fixed to the fixing portion 44 by, for example, press fitting. The rotor body 40 and the printed coil 42 are assembled by, for example, press-fitting the outer circumferential surface of the rotor body 40 into the inner circumferential surface of the printed coil 42. The printed coil 42 has a configuration in which a plurality of coils (not shown) are printed on the surface of the disk member. When power is supplied from a brush 50 described later, a magnetic field is generated from each coil (not shown). .

  As shown in FIG. 3, the brush holder 46 includes a pair of bottomed cylindrical brush box portions 48 extending along the rotation axis direction. The pair of brush box portions 48 are shown in FIG. 1. Thus, the brush 50 and the spring 52 are accommodated, respectively. Each brush 50 is urged toward the print coil 42 by the elastic force of the spring 52, so that each brush 50 is pressed against the print coil 42.

  The brush box portion 48 is inserted into a through-hole 34 formed in the housing 12, and the direction perpendicular to the longitudinal direction of the brush box portion 48 is closer to the stator magnet 62 than the through-hole 34 of the brush box portion 48. A flange portion 54 is formed extending in the direction. As shown in FIG. 3, the flange portion 54 is formed in a shape surrounding the pair of brush box portions 48.

  Further, as shown in FIGS. 2 and 3, an O-ring 56 as a seal member is interposed between the peripheral edge portion of the through hole 34 and the flange portion 54. The O-ring 56 mainly prevents foreign matter such as water droplets from entering the housing 12 through the through-hole 34, and follows the shape of the flange portion 54 so as to surround the pair of brush box portions 48. Is formed. Further, on the outer side of the O-ring 56 of the flange portion 54, a wall portion 58 that prevents the O-ring 56 from coming off (disengaged) is formed to protrude from the flange portion 54 toward the O-ring 56 side.

  In addition, the wall portion 58 has a function of preventing moisture that has exuded from the O-ring 56 from entering the housing 12 to enhance the waterproof effect, and before the O-ring 56 is crushed more than necessary. A function of preventing the O-ring 56 from being unnecessarily crushed by contacting the end housing 16 may be achieved.

  As shown in FIG. 3, a connection terminal 60 connected to a cable 59 extending from an external power source is provided between the pair of brush box portions 48 on the side opposite to the stator magnet 62 of the brush holder 46.

  The stator magnet 62 opposes the disk-shaped rotor 38 in the rotation axis direction, and the surface of the stator magnet 62 opposite to the surface facing the disk-shaped rotor 38 is bonded to the flat portion 36 formed in the end housing 16 with an adhesive 66. It is fixed by. Further, as shown in FIG. 4B, the stator magnet 62 is formed with a notch fixing portion 64 at a position corresponding to the brush holder 46.

  The notch fixing portion 64 is accommodated in the brush box portion 48 while the peripheral portion of the notch fixing portion 64 presses the flange portion 54 of the brush holder 46 when the brush holder 46 is fixed by the stator magnet 62 as will be described later. The brush 50 is provided to penetrate the printed coil 42 side through a notch fixing portion 64. The notch fixing portion 64 is formed along the shape of the flange portion 54 of the brush holder 46 and has a slightly smaller dimension than the flange portion 54 so that the flange portion 54 can be pressed.

  In this embodiment, the stator magnet 62 is fixed to the flat portion 36 of the end housing 16 by the adhesive 66, so that the flange portion 54 is connected to the end housing 16 side by the peripheral portion of the notch fixing portion 64 of the stator magnet 62. Is pressed. Further, when the flange portion 54 is pressed toward the end housing 16, the O-ring 56 is pressed by the peripheral edge portion of the through hole 34 and the flange portion 54.

  By the way, in the assembly process of the electric fan motor 10 of this embodiment, the attachment of the brush holder 46, the O-ring 56, and the stator magnet 62 to the end housing 16 is performed as follows. That is, the O-ring 56 is attached to the brush holder 46, and in this state, the brush box portion 48 is inserted into the through hole 34 of the end housing 16 from the housing body 14 side, and the flange portion 54 of the brush holder 46 is connected to the end housing. 16 insertion portions 32 are positioned. At this time, the entire brush holder 46 is temporarily attached to the end housing 16 so that the O-ring 56 contacts the peripheral edge portion of the through hole 34 and the flange portion 54.

  Subsequently, the stator magnet 62 is fixed to the flat portion 36 of the end housing 16 with an adhesive 66. At this time, by fixing the stator magnet 62 to the flat portion 36 of the end housing 16 by adhesion, the flange portion 54 is pressed toward the end housing 16 by the stator magnet 62. Then, by pressing the flange portion 54 toward the end housing 16 in this manner, the O-ring 56 is pressed by the peripheral edge portion of the through hole 34 and the flange portion 54.

  In this embodiment, the adhesive 66 that fixes the stator magnet 62 to the flat portion 36 of the end housing 16 is creep-destructed by a reaction force that presses the stator magnet 62 via the flange portion 54 of the O-ring 56. In order to prevent this, the attractive force of the stator magnet 62 to the housing 12 is set to be stronger than the reaction force that presses the stator magnet 62 via the flange portion 54 of the O-ring 56.

  Next, the operation of the electric fan motor 10 having the above configuration will be described.

  In the electric fan motor 10 of this embodiment, since the end housing 16 and the brush holder 46 are comprised separately, the process (press process) of the end housing 16 becomes easy. That is, the brush holder 46 needs a certain length of the brush 50 in order to have durability. At this time, if the brush holder 46 having a size capable of securing a certain length of the brush 50 is formed integrally with the end housing 16, the brush box portion 48 of the brush holder 46 protrudes from the end housing 16. Become. However, in this embodiment, since the end housing 16 and the brush holder 46 are configured separately, the end housing 16 can be easily processed (pressed).

  At this time, when the electric fan motor 10 is used, for example, as a fan motor for cooling the radiator, the electric fan motor 10 is placed in a wet environment, so that the inside of the housing 12 is passed through the through hole 34 of the end housing 16. It is expected that foreign substances such as water droplets will enter the

  However, in the electric fan motor 10 of the present embodiment, the brush holder 46 includes a flange portion 54 on the stator magnet 62 side of the through hole 34, and between the flange portion 54 and the peripheral portion of the through hole 34, An O-ring 56 is inserted. The O-ring 56 is pressed by the peripheral edge portion of the through hole 34 and the flange portion 54 when the flange portion 54 is pressed toward the end housing 16 by the stator magnet 62. Accordingly, the O-ring 56 is pressed by the peripheral edge portion of the through hole 34 and the flange portion 54 to ensure waterproofness around the brush holder 46, that is, a water droplet from the outside to the inside of the housing 12 through the through hole 34. It is possible to prevent the entry of foreign substances such as.

  Further, in the electric fan motor 10 of the present embodiment, the brush holder 46 includes the brush box portion 48 that accommodates the brush 50, but the flange portion 54 is formed in a shape surrounding the brush box portion 48, and O The ring 56 is formed along the shape of the flange portion 54. Therefore, even if the brush holder 46 includes the brush box portion 48 that accommodates the brush 50, waterproofness around the brush box portion 48 can be reliably ensured by the flange portion 54 and the O-ring 56.

  Moreover, in the electric fan motor 10 of this embodiment, the wall part 58 which protrudes from the flange part 54 to the O-ring 56 side is formed in the outer side rather than the O-ring 56 of the flange part 54. Accordingly, since the wall portion 58 plays a role in preventing the O-ring 56 from coming off, the movement of the O-ring 56 to the outside of the flange portion 54 is prevented by the wall portion 58. Thereby, it can prevent that the waterproofness around the brush box part 48 falls.

  Further, in the electric fan motor 10 of this embodiment, the brush holder 46 is fixed to the end housing 16 via the O-ring 56 by the flange portion 54 being pressed toward the end housing 16 by the stator magnet 62. Therefore, the brush holder 46 can be fixed to the end housing 16 easily and at low cost without using an adhesive or rivets. That is, the equipment cost, the number of parts, and the man-hour can be reduced.

  Furthermore, in the electric fan motor 10 of this embodiment, the stator magnet 62 is fixed to the housing 12 with the adhesive 66, so that the stator magnet 62 can be easily assembled to the housing 12. At this time, the attractive force of the stator magnet 62 to the housing 12 is set to be stronger than the reaction force that presses the stator magnet 62 via the flange portion 54 of the O-ring 56. This prevents the adhesive 66 that fixes the stator magnet 62 to the flat portion 36 of the end housing 16 from being creep-destructed by a reaction force that presses the stator magnet 62 via the flange portion 54 of the O-ring 56. Can do.

  Further, in the electric fan motor 10 of the present embodiment, as described above, the O-ring 56 is compressed by the peripheral edge portion of the through hole 34 and the flange portion 54, so that the motor is controlled by the vibration damping function of the O-ring 56. It is also possible to prevent abnormal noise by suppressing vibration of the brush holder 46 caused by the brush 50 being in sliding contact with the printed coil 42 during rotation.

  As described above in detail, the electric fan motor 10 of the present embodiment can be suitably used as a fan motor for cooling a radiator because it is waterproof.

It is sectional drawing of the electric motor which concerns on one Embodiment of this invention. It is a principal part enlarged view of the electric motor shown in FIG. It is the figure which looked at the brush holder which concerns on one Embodiment of this invention from the opposite side to the stator magnet. It is the figure which looked at the end housing which concerns on one Embodiment of this invention from the stator magnet side, (a) is a stator magnet unmounted state, (b) is a figure which shows a stator magnet mounted state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric fan motor (electric motor), 12 ... Housing, 14 ... Housing main body, 16 ... End housing, 18, 22 ... Bearing housing part, 20, 24 ... Bearing member, 26 ... Output shaft, 28 ... Opening part, 30 DESCRIPTION OF SYMBOLS ... Projection part, 32 ... Insertion part, 34 ... Through-hole, 36 ... Plane part, 38 ... Disc type rotor, 40 ... Rotor main body part, 42 ... Print coil, 44 ... Fixed part, 46 ... Brush holder, 48 ... Brush box , 50 ... brush, 52 ... spring, 54 ... flange part, 56 ... O-ring (seal member), 58 ... wall part, 59 ... cable, 60 ... connection terminal, 62 ... stator magnet, 64 ... notch fixing part, 66 …adhesive

Claims (5)

A disk-shaped rotor mounted on the output shaft and rotating integrally with the output shaft;
A housing for accommodating the disk-shaped rotor;
A stator magnet facing the disk-shaped rotor in the direction of the rotation axis and having a surface opposite to the surface facing the disk-shaped rotor mounted on the housing;
A brush holder having a flange portion inserted into a through hole formed in the housing and having a seal member interposed between the through hole and the peripheral portion of the through hole on the stator magnet side;
A brush that is pressed against the disk-shaped rotor and housed in the brush holder;
The electric motor according to claim 1, wherein the seal member is pressed by a peripheral edge portion of the through hole and the flange portion when the flange portion is pressed toward the housing by the stator magnet. The brush holder includes a brush box portion that houses the brush,
The flange portion is formed in a shape surrounding the brush box portion,
The electric motor according to claim 1, wherein the seal member is an O-ring formed along the shape of the flange portion.   The electric motor according to claim 2, wherein a wall portion that protrudes from the flange portion toward the O-ring side is formed outside the O-ring of the flange portion. The stator magnet is fixed to the housing with an adhesive,
The attraction force of the stator magnet to the housing is set to be stronger than a reaction force that presses the stator magnet through the flange portion of the O-ring. Electric motor.   The electric motor according to claim 1, wherein a radiator cooling fan is attached to the output shaft.

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