JP2007006593A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve size reduction of an electric motor, without impairing assemblability of the electric motor equipped with a control board. <P>SOLUTION: Brushes 38a, 38b that contact with a commutator 17 are attached to a brush mechanism 32 that feeds a drive current to the commutator 17. Feeding terminal 41, 42 connected to an output terminal 31 of the control board 22 are attached to the brushes 38a, 38b for feeding the drive currents to the brushes 38a, 38b from the control board 22 that controls the drive state of the electric motor, and the feeding terminals 41, 42 are overlapped with each other in the thickness direction α and are folded toward the control board 22. As a result, the feeding terminals 41, 42 and the output terminal 31 are connected to each other, accompanied by the assembling work of the control board 22, whereby the assembling efficiency of the electric motor can be improved. Furthermore, by overlapping the feed terminals 41, 42 in the thickness direction α, occupancy spaces of the feeding terminals 41, 42 can be reduced, and the size reduction of the electric motor can be achieved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor including a control board, and more particularly to a technique that is effective when applied to achieve miniaturization of the electric motor.

  A power window device and a sunroof device mounted on a vehicle include an electric motor as a drive source for opening and closing the window glass and the sunroof. A control board having a drive circuit and a rotation sensor is incorporated in the electric motor, and the drive current for the motor body is controlled by the control board. When assembling such an electric motor, it is necessary to electrically connect a power supply terminal extending from the motor body to the control board, but the assembly direction of the control board and the insertion direction of the power supply terminal are orthogonal to each other. Therefore, it has been difficult to improve the assembly workability of the electric motor.

Therefore, an electric motor has been proposed in which the assembly direction of the control board is aligned with the insertion direction of the power supply terminal by bending the power supply terminals arranged in the width direction to improve the assembly workability (for example, And Patent Document 1). In addition, an electric motor has been proposed in which a substantially C-shaped power terminal is assembled on a control board and the power feeding terminal is sandwiched from the width direction by the power terminal to improve the assembly workability (for example, Patent Documents). 2).
JP 2004-159387 A JP 2003-274612 A

  However, in the electric motor described in Patent Document 1, the power supply terminals extending from the motor body are arranged side by side in the width direction, and a connector having a large width is formed, so that the space occupied by the power supply terminals is large. As a result, the size of the electric motor was increased. In particular, since an electric motor for driving a power window device or a sunroof device is assembled in a door or a roof where space is limited, it is important to reduce the size and thickness of the electric motor.

  Normally, the power supply terminal is composed of a pair of terminals. However, how to wire these terminals from the power supply unit to the substrate and how to insulate the terminals from each other is a problem. However, Patent Literature 1 does not mention the technology so far, and this point is also a problem in miniaturizing the electric motor.

  In addition, in the electric motor described in Patent Document 2, it is possible to achieve miniaturization, but the power supply terminal assembled to the control board has a special structure of a substantially C shape, From the viewpoint of cost reduction, it is desired to simplify the terminal shape.

  An object of the present invention is to achieve the miniaturization of an electric motor including a control board without impairing the assembly workability of the electric motor.

  An electric motor of the present invention is an electric motor that includes a motor rotating body incorporated in a motor housing chamber and a control board incorporated in a substrate housing chamber, and drives the motor rotating body by a driving current from the control board. In the case wall portion that divides the motor storage chamber and the substrate storage chamber, a communication hole that connects the motor storage chamber and the substrate storage chamber is formed. A first feeding terminal and a second feeding terminal guided to the substrate housing chamber through the communication hole are provided, and the first feeding terminal and the second feeding terminal arranged in the substrate housing chamber are terminals of In addition to being stacked in the thickness direction, each distal end portion is bent toward the control board, and the control board is incorporated into the board housing chamber, whereby the connection part of the control board and the tip of the power supply terminal The parts characterized in that it is electrically connected.

  The electric motor of the present invention is characterized in that an insulating member is provided between the first power supply terminal and the second power supply terminal to be overlapped.

  In the electric motor of the present invention, the power feeding mechanism includes a base portion to which the power feeding terminal is attached, and the insulating member and the base portion are integrally formed with resin.

  The electric motor of the present invention is characterized in that the first power supply terminal disposed on the control board side among the power supply terminals is bent toward the control board after being bent toward the second power supply terminal. And

  The electric motor of the present invention is characterized in that the first power supply terminal and the second power supply terminal are bent within a range of the size of the communication hole.

  In the electric motor of the present invention, the control board is assembled to the board housing chamber from a direction orthogonal to the rotation axis of the motor rotating body, and the tip of the power supply terminal is bent so as to face the assembly direction of the control board. It is characterized by being able to.

  According to the present invention, the first power supply terminal and the second power supply terminal are overlapped with each other in the thickness direction of the terminal, and the front ends of the first power supply terminal and the second power supply terminal are bent toward the control board. Therefore, the assembly direction of the electric motor can be matched with the insertion direction of the power supply terminal, and the assembly workability of the electric motor can be improved. In addition, since the power supply terminals are stacked in the thickness direction, the space occupied by the power supply terminals in the substrate housing chamber can be reduced, and the miniaturization of the electric motor can be achieved.

  In addition, since the first power supply terminal disposed on the control board side is bent toward the second power supply terminal, the connection portion of the control board can be brought close to the second power supply terminal, so that the control board is placed in the board housing chamber. Can be incorporated compactly. As a result, it is possible to reduce the size of the electric motor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an electric motor 10 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a part of the electric motor 10 in an exploded manner. An electric motor 10 shown in FIG. 1 is incorporated in a power window device (not shown) mounted on a vehicle, and is used as a power source when opening and closing a window glass assembled on a door.

  As shown in FIG. 1, the electric motor 10 includes a motor body 12 housed in a motor case 11 and a speed reduction mechanism 14 housed in a gear case 13, and the motor power output from the motor body 12 is reduced. It is transmitted to the output shaft 15 via the mechanism 14. The motor main body 12 is a so-called brushed DC motor, and a field magnet (not shown) is fixed in the motor housing chamber 11a of the motor case 11, and an armature 16 and a commutator 17 which are motor rotating bodies are rotatably accommodated. Is done. The speed reduction mechanism 14 that decelerates the motor power includes a worm 19 provided on an armature shaft 18 as a rotating shaft and a worm wheel 20 that meshes with the worm wheel 20 and is fixed to the output shaft 15.

  As shown in FIG. 2, a control board 22 for controlling the drive current of the motor body 12 is housed in a board housing chamber 21 a of the controller case 21 adjacent to the gear case 13 from a direction substantially perpendicular to the armature shaft 18. A case cover 23 that closes the substrate housing chamber 21a is assembled to the opening of the controller case 21, and is fixed by fastening means such as screws (not shown). In addition, a communication hole 21c that connects the motor storage chamber 11a and the substrate storage chamber 21a is formed in the case wall portion 21b of the controller case 21 that partitions the motor storage chamber 11a and the substrate storage chamber 21a. Feed terminals 41 and 42, which will be described later, are guided to the substrate housing chamber 21a through the holes 21c.

  In addition, a rectangular hole 24 communicating with the outside is formed in the controller case 21, and a rectangular tubular wall portion 25 that protrudes to the outside is formed so as to surround the rectangular hole 24. An input terminal portion 26 facing the rectangular hole 24 is assembled to the control board 22, and a male connector 27 is configured by the wall portion 25 and the input terminal portion 26 disposed inside the wall portion 25. A female connector (not shown) connected to a battery or an open / close switch is attached to the connector 27, and a battery current is supplied from the battery to the control board 22 and an open / close signal is input from the open / close switch. .

  As described above, the drive circuit unit 30 is provided on the control board 22 to which the battery current and the open / close signal are input. The drive circuit unit 30 includes electronic components such as a CPU, a relay, a capacitor, a transistor, a resistor, and a diode. And a printed circuit that electrically connects these electronic components. The battery current supplied from the input terminal unit 26 to the control board 22 is controlled by the drive current via the drive circuit unit 30 constructed on the control board 22, and then from the output terminal unit 31 as a connection unit to the motor body 12. Is supplied to a brush mechanism 32 which is a power feeding mechanism. The control board 22 controls the drive current based on the open / close signal from the open / close switch.

  3A and 3B are perspective views showing the brush mechanism 32 and the control board 22 connected thereto. 4A is a bottom view showing the brush mechanism 32 and the control board 22 from the direction of arrow a in FIG. 3B, and FIG. 4B is the brush mechanism from the direction of arrow b in FIG. 32 is a front view showing the control board 22 and the control board 22. FIG. 4C is a rear view showing the brush mechanism 32 and the control board 22 from the direction of the arrow c in FIG. 3B, and FIG. 4D is the brush mechanism from the direction of the arrow d in FIG. It is a side view which shows 32 and the control board 22. FIG.

  As shown in FIGS. 3 and 4, the brush mechanism 32 that supplies a driving current to the rotating commutator 17 has a resin brush holder 34 having a through hole 33 in the center, and the brush holder 34. Is constituted by a substantially elliptical base portion 35 and a pair of attachment portions 36 extending from the base portion 35. Further, a screw member (not shown) is attached to the attachment hole 36 a formed in the attachment portion 36, and the brush holder 34 is assembled to the controller case 21 with the end surface of the attachment portion 36 abutting against the controller case 21. Further, as shown in FIG. 4C, brushes 38a and 38b are attached to the brush holder 34 via leaf spring members 37a and 37b in order to supply drive current to the commutator 17 located inside the through hole 33. The opposed brushes 38 a and 38 b are in electrical contact with the commutator 17 disposed inside the through hole 33. In addition, by attaching the brushes 38a and 38b via the leaf spring members 37a and 37b, the brushes 38a and 38b can be elastically pressed against the commutator 17, and the brushes 38a and 38b are pressed against the rotating commutator 17. It is possible to ensure sliding contact.

  Further, as shown in FIG. 4C, a plate-like first power supply terminal 41 is connected to the leaf spring member 37a that supports the brush 38a in order to supply the drive current from the control board 22 to the brushes 38a and 38b. The plate-like second power supply terminal 42 is connected to the leaf spring member 37b that supports the brush 38b. As shown in FIG. 4D, an insulating member 43 extending along the armature shaft 18 is integrally molded with the base 35 of the brush holder 34, and a power supply terminal 41 is formed on the upper end surface of the insulating member 43. Is attached to the lower end surface of the insulating member 43. Thus, the power supply terminals 41 and 42 sandwiching the insulating member 43 are arranged so as to overlap in the thickness direction α of the terminals. And the front-end | tip part of the electric power feeding terminals 41 and 42 extended substantially parallel with respect to the amateur axis | shaft 18 is bent at substantially right angle toward the output terminal part 31 of the control board 22, and as shown to FIG. 3 (A). The assembly direction β of the control board 22 and the insertion direction γ of the power supply terminals 41 and 42 coincide with each other. In other words, the distal ends of the power supply terminals 41 and 42 are bent so as to face the assembly direction β of the control board 22.

  In this way, by making the assembly direction β of the control board 22 coincide with the insertion direction γ of the power supply terminals 41 and 42, the power supply terminal of the brush mechanism 32 is accompanied with the assembly work of the control board 22 to the controller case 21. 41 and 42 can be inserted into the output terminal portion 31 of the control board 22, and the output terminal portion 31 and the power supply terminals 41 and 42 can be electrically connected, so that the assembly work of the electric motor 10 is simplified. Can be achieved. Moreover, since the power supply terminals 41 and 42 are stacked in the thickness direction α, the occupied space of the power supply terminals 41 and 42 in the substrate housing chamber 21a can be reduced, and the electric motor 10 can be reduced in size. .

  Hereinafter, the bending structure of the power supply terminals 41 and 42 will be described in detail with reference to FIG. FIG. 5 is an explanatory diagram schematically showing power supply terminals 41 and 42 connected to the output terminal portion 31. As shown in FIG. 5, the insulating member 43 includes a thick plate portion 43 a formed on the proximal end side and a thin plate portion 43 b formed on the distal end side, via the communication hole 21 c of the case wall portion 21 b. The motor housing chamber 11a is inserted into the substrate housing chamber 21a. The power supply terminal 42 provided along the lower end surface of the insulating member 43 is bent in a substantially L shape within a size range of the communication hole 21c while the power supply terminal 42 is provided along the upper end surface of the insulating member 43. The provided power supply terminal 41 has its tip end bent in a substantially U shape within the size of the communication hole 21c so as to follow the shape change from the thick plate portion 43a to the thin plate portion 43b. In other words, the distal end portion of the power supply terminal 42 is formed in a substantially L shape by the substrate portion 42 a that is substantially parallel to the armature shaft 18 and the insertion plate portion 42 b that is bent substantially at right angles toward the output terminal portion 31. The front end portion of the power supply terminal 41 has a substrate portion 41a that is substantially parallel to the substrate portion 42a, a vertical plate portion 41b that is bent substantially at a right angle toward the substrate portion 42a, and a substantially right angle toward the insertion plate portion 42b. Are formed in a substantially U-shape by a horizontal plate portion 41 c bent to a right angle and an insertion plate portion 41 d bent substantially at a right angle toward the output terminal portion 31.

  As described above, the power supply terminal 41 disposed on the control board 22 side is bent toward the power supply terminal 42 so that the front end portion of the power supply terminal 41 is formed in a substantially U-shape. And while ensuring the height dimension H1 of the insulating member 43, a space for allowing the output terminal portion 31 to enter can be secured, and the output terminal portion 31 can be brought closer to the power supply terminal. That is, since the output terminal portion 31 can be inserted from the height level L1 of the substrate portion 41a to the height level L2 of the horizontal plate portion 41c, the control substrate 22 can be compactly incorporated in the substrate accommodating chamber 21a, and It becomes possible to reduce the size of the motor 10.

  Further, by forming the feeding terminal 41 in a substantially U shape, the height dimension H2 of the insertion plate portion 42b is set to be smaller than the height dimension H1 while securing the insertion allowance of the insertion plate portions 41d and 42b. Is possible. Thereby, since the height dimension H3 of the communication hole 21c can be set to the minimum, not only can the rigidity of the case wall portion 21b be sufficiently secured, but the waterproofness and dustproofness of the substrate housing chamber 21a can be secured. It becomes possible to raise. Furthermore, since the interval W between the insertion plate portions 41d and 42b can be set freely, the interval W between the insertion plate portions 41d and 42b can be set according to the interval between the insertion ports formed in the output terminal portion 31. It becomes possible. That is, since it becomes easy to employ the standard output terminal portion 31, the cost of the electric motor 10 can be reduced.

  As shown in FIG. 2, since the wall portion 25 constituting the connector 27 is formed on the controller case 21, the pressing load when connecting the connector 27 can be supported by the controller case 21. Thereby, since the load applied to the control board 22 can be reduced, the load-bearing capacity of the control board 22 can be set low, and the cost and weight of the control board 22 can be reduced. .

  Further, as shown in FIGS. 2 and 4A, a multipolar magnetized magnet 44 is fixed to the armature shaft 18, and the control board 22 has 2 to be close to the multipolar magnetized magnet 44. Two Hall elements 45 are assembled. When the electric motor 10 is driven, a pulse signal corresponding to the rotation of the armature shaft 18 is output from each Hall element 45. Therefore, the drive circuit unit 30 performs feedback control of the drive current based on the motor rotation speed. Is possible.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, as shown in FIG. 5, in order to reduce the height dimension H3 of the communication hole 21c, it is desirable to set the height dimension H2 of the insertion plate portion 42b to be smaller than the height dimension H1, but the height dimension H1. The height dimension H2 of the insertion plate portion 42b may be set beyond this.

  In the illustrated case, the two brushes 38a and 38b facing the brush mechanism 32 are attached. However, the present invention is not limited to this, and brushes may be added. In this case, the number of power supply terminals increases according to the added brush, but by overlapping all the power supply terminals in the thickness direction, the space occupied by the power supply terminals is reduced and the electric motor is downsized. It becomes possible to do.

  Further, in the illustrated case, the tip portions of the power supply terminals 41 and 42 are bent at a substantially right angle, but are not limited to a right angle, the mounting angle of the power supply terminals 41 and 42 with respect to the brush holder 34, the controller case The control board 22 may be appropriately changed according to the assembly angle of the control board 22 with respect to 21. Furthermore, it goes without saying that the power supply terminals 41 and 42 may be bent without being bent.

  Furthermore, in the above description, the electric motor 10 of the present invention is incorporated in the power window device, but the present invention is not limited to this, and the present invention may be applied to an electric motor incorporated in the wiper device. Furthermore, the electric motor 10 of the present invention may be incorporated in a sunroof device or tailgate device that automatically opens and closes the sunroof or tailgate.

  In the illustrated case, a DC motor with a brush is used as the motor body 12. However, the present invention is not limited to this, and other types of motor rotating bodies such as a brushless DC motor may be adopted. Needless to say.

It is a perspective view which shows the electric motor which is one embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows a part of electric motor. (A) And (B) is a perspective view which shows a brush mechanism and a control board connected to this. 3A is a bottom view showing the brush mechanism and the control board from the direction of arrow a in FIG. 3B, and FIG. 3B is a front view showing the brush mechanism and the control board from the direction of arrow b in FIG. 3C is a rear view showing the brush mechanism and the control board from the direction of arrow c in FIG. 3B, and FIG. 3D is a side view showing the brush mechanism and the control board from the direction of arrow d in FIG. FIG. It is explanatory drawing which shows roughly the electric power feeding terminal connected to an output terminal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric motor 11 Motor case 11a Motor accommodating chamber 12 Motor main body 13 Gear case 14 Reduction mechanism 15 Output shaft 16 Amateur (motor rotating body)
17 Commutator 18 Amateur axis (rotary axis)
19 Worm 20 Worm wheel 21 Controller case 21a Substrate accommodating chamber 21b Case wall portion 21c Communication hole 22 Control substrate 23 Case cover 24 Rectangular hole 25 Wall portion 26 Input terminal portion 27 Connector 30 Drive circuit portion 31 Output terminal portion (connection portion)
32 Brush mechanism (power feeding mechanism)
33 Through-hole 34 Brush holder 35 Base portion 36 Attachment portion 36a Attachment holes 37a, 37b Leaf spring members 38a, 38b Brush 41 Feed terminal (first feed terminal)
41a Substrate portion 41b Vertical plate portion 41c Horizontal plate portion 41d Insert plate portion 42 Feed terminal (second feed terminal)
42a Substrate part 42b Insertion plate part 43 Insulating member 43a Thick plate part 43b Thin plate part 44 Multipolar magnetized magnet α Thickness direction β Assembly direction γ Insertion direction

Claims (6)

An electric motor comprising a motor rotating body incorporated in the motor housing chamber and a control board incorporated in the substrate housing chamber, and driving the motor rotating body by a drive current from the control board,
Forming a communication hole in the case wall portion that divides the motor storage chamber and the substrate storage chamber to communicate the motor storage chamber and the substrate storage chamber;
The power feeding mechanism incorporated in the motor housing chamber is provided with a first power feeding terminal and a second power feeding terminal guided to the substrate housing chamber through the communication hole,
The first power supply terminal and the second power supply terminal arranged in the substrate housing chamber are overlapped in the thickness direction of the terminals, and respective distal end portions are bent toward the control board,
By incorporating the control board into the board housing chamber, the connection part of the control board and the tip part of the power supply terminal are electrically connected.   The electric motor according to claim 1, wherein an insulating member is provided between the first power supply terminal and the second power supply terminal to be overlapped.   3. The electric motor according to claim 2, wherein the power feeding mechanism includes a base portion to which the power feeding terminal is attached, and the insulating member and the base portion are integrally formed with resin.   The electric motor according to any one of claims 1 to 3, wherein the first power supply terminal disposed on the control board side among the power supply terminals is bent toward the second power supply terminal. An electric motor which is bent toward a control board.   5. The electric motor according to claim 1, wherein the first power supply terminal and the second power supply terminal are bent within a range of the size of the communication hole.   6. The electric motor according to claim 1, wherein the control board is assembled to the board housing chamber from a direction orthogonal to a rotation axis of the motor rotating body, and a front end portion of the power supply terminal is the control section. An electric motor characterized by being bent so as to face an assembly direction of a substrate.

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