JP3677020B2 - Power window drive motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power window drive motor of an automobile, for example.
[0002]
[Prior art]
In a power window of an automobile, the window glass is driven up and down by a drive motor, and the drive motor is controlled by an ECU (control unit).
[0003]
In this control, when it is necessary to know the raising / lowering position of the window glass, a Hall IC is attached to the drive motor. The Hall IC is provided on the motor housing side corresponding to the magnet fixed to the outer peripheral surface of the armature shaft, is an alternating type, and detects a magnetic fluctuation accompanying the rotation of the armature shaft and emits a pulse. The pulses are output to the ECU, and the ECU counts the pulses to detect the raising / lowering position of the window glass, and drives and controls the drive motor based on the raising / lowering position of the window glass.
[0004]
Here, conventionally, the drive motor is provided in the door, while the ECU is provided in the armrest of the door or under the handle, and the drive motor and the ECU are arranged separately.
[0005]
[Problems to be solved by the invention]
For this reason, as shown in FIG. 6, in the ECU 100, the substrate 102 is accommodated in a protective case 106 with a lid 104, the case 106 is attached to the vehicle body side by a bracket 108, and an ECU-dedicated case 106 and bracket 108 are separately required. It becomes.
[0006]
Further, as shown in FIG. 7, the ECU 100 and the window glass raising / lowering switch 110 are connected to each other via the first connector 112, and in addition, the ECU 100, the motor main body 114, and the drive motor 118 including the Hall IC 116, Are connected to each other via the second connector 120. Here, complicated wiring and long distances are not preferable.
[0007]
When the wiring is extended, the following problem occurs.
[0008]
That is, when a power relay (not shown) for operating the motor is installed in the ECU 100, if the distance between the drive motor 118 and the ECU 100 is far away, the motor power line becomes long and the wiring resistance (wiring becomes long). The problem of voltage drop due to increased wiring resistance is introduced. When the window glass is closed, the window glass is restrained and a lock current is generated.
[0009]
When the lock current is generated, a large voltage drop occurs and the motor torque efficiency is greatly reduced. Therefore, in order to close the window glass against the restraining force of the window glass, it is necessary to enlarge the drive motor.
[0010]
In consideration of the above facts, the present invention aims to reduce the number of components in the control unit, and to obtain a power window drive motor that simplifies wiring and shortens the distance to the control unit. .
[0011]
[Means for Solving the Problems]
  A power window drive motor according to a first aspect of the present invention includes an armature shaft, and a motor main body that opens and closes the window by a drive force transmitted through a worm wheel that meshes with a worm provided on the armature shaft. A gear box connected to the motor body and containing the armature shaft and the worm wheel;A cover that closes the gear box, and a part of the cover that is disposed between the cover and the worm so as to straddle the worm;A control unit for driving and controlling the motor body is incorporated, and a connection terminal connected to an external circuit is attached.Has a rectangular partA board, and a magnetic sensor mounted on the board and emitting a pulse as the motor body rotates,Attached to the rectangular partAt least one of the control unit and the connection terminal is accommodated in a cavity formed between the base plate and the bottom wall of the gear box on the side in the rotational radial direction of the armature shaft. It is a feature.
[0012]
  In the power window drive motor according to the first aspect of the present invention, a substrate is provided.Rectangle part ofControl unit for controlling the motor bodyIs further provided on this substrate.A magnetic sensor that emits pulses as the motor body rotates is provided.The Moreover,This substrate is disposed in a gear box that accommodates a part of the armature shaft provided in the motor body. For this reason, in the power window drive motor, the motor main body and the control unit for controlling the motor main body are integrated.
[0013]
This eliminates the need for a case or bracket dedicated to the control unit that is required when a control unit is provided separately, and the number of components in the control unit can be reduced. In addition, the wiring between the motor body and the control unit is shortened and simplified as compared with the case where the control unit is provided separately.
[0014]
Furthermore, by integrating with the control unit as described above, even if a power relay for driving the motor is arranged in the control unit, the motor power line may be short, its wiring resistance is small, and voltage drop based on the wiring resistance Is suppressed. Thereby, the overall size reduction of this power window drive motor is attained.
[0015]
In this way, the cost of the entire power window system is also reduced.
[0016]
  In addition, as described above, since the magnetic sensor that emits a pulse as the motor body rotates is also mounted on the substrate, the wiring distance of the magnetic sensor signal line can be shortened and simplified.
And since a board | substrate is arrange | positioned so that a worm may be straddled, it can arrange | position in the state which made the board | substrate approach to a worm and a worm wheel. For this reason, for example, the magnetic sensor mounted on the substrate can be disposed close to the worm or worm wheel. Thus, when the rotation of the motor body is detected indirectly by detecting the rotation of the worm or worm wheel, the rotation of the worm or worm wheel can be reliably detected by the magnetic sensor. The degree of freedom of arrangement of each component mounted on a substrate such as a magnetic sensor is improved.
[0017]
Further, in this power window drive motor, at least one of the control unit provided on the board and the connection terminal connected to the external circuit is on the side of the armature shaft in the rotational radius direction, and the bottom wall of the board and the gear box. Is accommodated in a cavity formed between the two. By accommodating at least one of the above in such a cavity, it is not necessary to forcibly flatten the control unit and the connection terminal on the substrate, and to reduce the thickness of the entire substrate. The substrate can be miniaturized.
[0018]
The magnetic sensor may be positioned corresponding to the output gear and emit a pulse as the output gear rotates. Alternatively, the magnetic sensor may be positioned corresponding to the armature shaft extending from the motor body and pulsed as the armature rotates. May be issued.
[0019]
  A power window drive motor according to a second aspect of the present invention includes an armature shaft, and a motor main body that opens and closes the window by a driving force transmitted through a worm wheel that meshes with a worm provided on the armature shaft. ,A cover that closes the gear box, and a part of the cover is disposed between the cover and the worm so as to straddle the worm;A control unit for driving and controlling the motor body is incorporated, and a connection terminal connected to an external circuit is attached.Has a rectangular partA substrate, a magnetic sensor mounted on the substrate and emitting a pulse as the motor body rotates, and the motor bodyAs well asAt the side of the armature shaft in the radial direction of rotationAttached to the rectangular partAnd a gear box in which a hollow portion that accommodates at least one of the connection terminal and the control unit is formed.
[0020]
  In the power window drive motor according to the second aspect of the present invention, a substrate is provided.Rectangle part ofControl unit for controlling the motor bodyIs further provided on this substrate.A magnetic sensor that emits pulses as the motor body rotates is provided.The Moreover,This substrate is disposed in a gear box that accommodates a part of the armature shaft provided in the motor body. For this reason, in the power window drive motor, the motor main body and the control unit for controlling the motor main body are integrated.
[0021]
This eliminates the need for a case or bracket dedicated to the control unit that is required when a control unit is provided separately, and the number of components in the control unit can be reduced. In addition, the wiring between the motor body and the control unit is shortened and simplified as compared with the case where the control unit is provided separately.
[0022]
Furthermore, by integrating with the control unit as described above, even if a power relay for driving the motor is arranged in the control unit, the motor power line may be short, its wiring resistance is small, and voltage drop based on the wiring resistance Is suppressed. Thereby, the overall size reduction of this power window drive motor is attained.
[0023]
In this way, the cost of the entire power window system is also reduced.
[0024]
  In addition, as described above, since the magnetic sensor that emits a pulse as the motor body rotates is also mounted on the substrate, the wiring distance of the magnetic sensor signal line can be shortened and simplified.
And since a board | substrate is arrange | positioned so that a worm may be straddled, it can arrange | position in the state which made the board | substrate approach to a worm and a worm wheel. For this reason, for example, the magnetic sensor mounted on the substrate can be disposed close to the worm or worm wheel. Thus, when the rotation of the motor body is detected indirectly by detecting the rotation of the worm or worm wheel, the rotation of the worm or worm wheel can be reliably detected by the magnetic sensor. The degree of freedom of arrangement of each component mounted on a substrate such as a magnetic sensor is improved.
[0025]
  Furthermore, in this power window drive motor, a cavity is formed on the side in the rotational radial direction of the armature shaft in the gear box. This cavity has a substrateRectangle part ofAt least one of a control unit provided in the terminal and a connection terminal connected to an external circuit is accommodated. By accommodating at least one of the above in such a cavity, it is not necessary to forcibly flatten the control unit and the connection terminal on the substrate, and to reduce the thickness of the entire substrate. The substrate can be miniaturized.
[0026]
The magnetic sensor may be positioned corresponding to the output gear and emit a pulse as the output gear rotates. Alternatively, the magnetic sensor may be positioned corresponding to the armature shaft extending from the motor body and pulsed as the armature rotates. May be issued.
[0027]
  A power window drive motor according to a third aspect of the present invention is the power window drive motor according to the first or second aspect of the present invention.Formed continuously from the rectangular portion,An annular ring disposed between the worm wheel and a cover for closing the gear box in a state of being opposed to the peripheral portion of the worm wheel.PartThe above-described substrate is configured.
[0028]
In the power window drive motor according to the third aspect of the present invention, the worm wheel meshes with the worm provided on the armature shaft. Therefore, when the worm rotates together with the armature shaft, this rotation is transmitted to the worm wheel and the worm wheel rotates.
[0029]
  On the other hand, in this power window drive motor, the substrateContinuously from the rectangular partAnnulusIs formed.The annular portion is disposed between the worm wheel and the cover for closing the gear box in a state of being opposed to the peripheral portion of the worm wheel.
[0030]
A power window drive motor according to a fourth aspect of the present invention is the power window drive motor according to the first aspect of the present invention, wherein a part of the cover that closes the gear box is stepped. An element disposition gap is formed between the cover and the bottom wall of the gear box, in which elements attached to the substrate are disposed.
[0031]
In the power window drive motor according to the fourth aspect of the present invention, a part of the cover for closing the gear box is formed with a step, whereby an element disposition gap is formed between the cover and the gear box. In this power window drive motor, the elements provided on the substrate are arranged in the element arrangement gap.
[0032]
Thus, by forming a step in part of the cover to form the element arrangement gap, the substrate can be efficiently accommodated without increasing the gear box thickness while increasing the mechanical strength of the cover.
[0033]
A power window drive motor according to a fifth aspect of the present invention is the power window drive motor according to the first aspect of the present invention, wherein the hollow portion is formed on both sides of the armature shaft, The connection terminal is accommodated in the hollow portion located on the peripheral wall side of the gear box.
[0034]
In the power window drive motor according to the fifth aspect of the present invention, the hollow portions are formed on both sides of the armature shaft. Furthermore, a connection terminal is accommodated in the direction located in the surrounding wall side of a gear box among these hollow parts.
[0035]
In this way, the connection terminal is accommodated in the cavity on the peripheral wall side, so that, for example, the wiring can be connected to the connection terminal simply by cutting out a part of the peripheral wall of the gear box corresponding to the cavity, or the connection terminal Can be exposed to the outside.
[0036]
A power window drive motor according to a sixth aspect of the present invention is the power window drive motor according to any one of the first to fifth aspects, wherein at least a part of the hollow portion is disposed in the gear box. It is characterized in that it is formed adjacent to the housing portion of the worm wheel.
[0037]
In the power window drive motor according to the sixth aspect of the present invention, the housing portion of the gear box in which at least one of the control portion and the connection terminal is housed is adjacent to the housing portion of the worm wheel in the gear box. It is formed. As a result, at least one of the control unit and the connection terminal accommodated in the accommodation unit and the worm wheel are arranged close to each other, and a useless space where nothing is arranged in the gear box can be reduced or eliminated. it can.
[0038]
For this reason, it is possible to reduce the size of the gear box, and thus the overall size of the power window drive motor.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a power window drive motor 14 according to an embodiment of the present invention will be described with reference to FIGS.
[0040]
As shown in FIG. 2, a power window driving motor (hereinafter simply referred to as a driving motor) 14 is provided in a door 12 in a power window of an automobile. A drum 16 is connected to the drive motor 14, and both ends of a wire 18 are wound around the drum 16 in different directions. A carrier plate 20 is fixed to an intermediate portion of the wire 18.
[0041]
The drum 16 rotates forward and backward in accordance with the forward and reverse rotations of the drive motor 14, and one end of the wire 18 is wound around the drum 16 by the forward rotation of the drum 16, and the other end of the wire 18 is wound on the drum 16. Drawn from. On the other hand, one end of the wire 18 is pulled out from the drum 16 due to the reverse rotation of the drum 16, and the other end of the wire 18 is wound around the drum 16. As a result, the carrier plate 20 moves up and down the guide rail 22 in accordance with the forward and reverse rotations of the drive motor 14, and the window glass 24 attached to the carrier plate 20 ascends (the window glass closing direction). Move) and descend (moves in the window glass opening direction).
[0042]
As shown in FIG. 3, the drive motor 14 includes a motor main body 26 including a stator 28 and a rotor (armature) 30. A gear box 32 is connected to the motor body 26. An armature shaft 34 is accommodated in the gear box 32. A worm 36 is provided on the armature shaft 34, and a worm wheel 38 (or a helical gear) constituting an output gear meshes with the worm 36. The worm wheel shaft 40 is orthogonal to the armature shaft 34.
[0043]
As shown in FIG. 1, the gear box 32 is open at one end in the worm wheel shaft 40 direction, and the open end is closed (closed) by a motor cover 42 as a cover attached from one end side in the worm wheel shaft 40 direction. . In the gear box 32, an element substrate 44 as a substrate in which a control unit (ECU) is incorporated between the worm wheel 38 and the motor cover 42 is one end side in the worm wheel shaft 40 direction, that is, the open end of the gear box 32. Housed from the side.
[0044]
The element substrate 44 is concentric with the worm wheel shaft 40 and includes an annular portion 46 facing the peripheral portion of the worm wheel 38 and a rectangular portion 48 facing the tip portion of the armature shaft 34. The peripheral portion of the worm wheel 38 is thin, and an annular magnet 50 is fixed to the peripheral portion.
[0045]
The magnet 50 has a plurality of poles in which different poles are alternately arranged along the annular direction (the rotation direction of the worm wheel 38). On the outer peripheral side of the magnet 50, an element arrangement space 51 such as a transistor is formed between the element substrate 44 and the worm wheel 38 (see FIG. 4).
[0046]
A pair of Hall ICs 52 and 54 (Hall IC, A, Hall IC, B) constituting a magnetic sensor corresponding to the magnet 50 are mounted on the element substrate 44 in the element arrangement gap 51. As described above, since the element substrate 44 is accommodated in the gear box 32 from one end side in the worm wheel axis 40 direction, the Hall ICs 52 and 54 mounted on the element substrate 44 are also in the gear box from one end side in the worm wheel axis 40 direction. 32.
[0047]
In FIG. 4, reference numeral 55 denotes an element such as a transistor. The Hall ICs 52 and 54 are of an alternating type and are arranged at a predetermined angular interval around the worm wheel shaft 40 to detect magnetic fluctuations generated as the magnet 50 rotates together with the worm wheel 38 and emit pulses.
[0048]
A cavity 58 is formed between the rectangular portion 48 of the element substrate 44 and the bottom wall of the gear box 32 and between the portion containing the armature shaft 34 in the gear box 32 and the portion containing the worm wheel 38. ing. The hollow portion 58 is mounted on the rectangular portion 48 of the element substrate 44 in a state where the ECU main body 56 constituting the control portion is accommodated.
[0049]
  On the other hand, a cavity 60 is formed on the side opposite to the cavity 58 through the portion of the gear box 32 that accommodates the worm wheel 38. The hollow portion 60 is mounted on the rectangular portion 48 of the element substrate 44 in a state where a terminal 62 as a connection terminal is accommodated.Thus, the element substrate 44 on which the ECU main body 56 and the terminal 62 are mounted is arranged so as to straddle the worm 36 between the cavity 58 and the cavity 60.A wiring lead-out opening 64 is formed in the side wall of the gear box 32 corresponding to the hollow portion 60, and the wirings 66 and 68 are connected to the terminal 62 through the opening 64 as shown in FIG.
[0050]
The element substrate 44 is provided with a power relay (not shown) for operating the motor, and the wiring 66 is a power line between the power relay and the motor body 26. On the other hand, the wiring 68 includes an operation line to the window glass lift switch 70 via the terminal 62 and a power line to the power source 72 (see also FIG. 5).
[0051]
In the ECU, for example, motor control as described below is performed.
That is, when a foreign object is caught between the window glass 24 and the window frame 25 (see FIG. 2) while the window glass 24 is being raised, the drive motor 14 is immediately stopped or once it is reversed and then stopped. Measures to prevent pinching are taken. A power window that takes this measure is called a so-called jam protection type power window.
[0052]
The pinching prevention measure is performed based on a lock current generated when a foreign object is pinched. On the other hand, when the window glass 24 is cut off, the window glass 24 is restrained from being raised and lowered by the window frame 25 to generate a lock current.
[0053]
Therefore, after the window glass 24 reaches a predetermined position where there is no risk of foreign objects being caught, even if a lock current is generated, it is necessary to complete the closing of the window glass 24 without taking any measures to prevent the jamming.
[0054]
Therefore, in the ECU, pulses emitted from the Hall ICs 52 and 54 are up-counted along with the normal rotation of the worm wheel 38 (motor forward rotation) and down-counted along with the reverse rotation of the worm wheel 38 (motor reverse rotation). The motor rotation position is known by the pulse count number, and therefore the raising / lowering position of the window glass 24 is known. After the pulse count number reaches the pulse count number n corresponding to the predetermined position of the window glass 24, the motor control is performed so as not to take a pinching prevention measure.
[0055]
Here, in the case of the normal rotation of the worm wheel 38, one Hall IC 52 emits a pulse first, and before that Hall IC 52 emits the next pulse, the other Hall IC 54 emits a pulse between the Hall ICs 52, 54. Pulses are generated one after another for each Hall IC so that a phase difference is generated in the pulses. The pulse of the Hall IC 52 and the pulse of the Hall IC 54 are added together and counted up. Therefore, it corresponds to the rotation amount of the worm wheel 38. That is, the pulse count number with respect to the amount of raising and lowering of the window glass is doubled as compared with the case where there is a single Hall IC, and the pulse resolution is increased.
[0056]
As the pulse resolution is increased, the predetermined position of the window glass 24 is brought closer to the closing position of the window glass 24, and a dead zone (a position between the predetermined position of the window glass 24 and the closing position of the window glass 24 is not taken). This makes it possible to prevent the trapping of even smaller foreign objects while ensuring the normal closing operation of the window glass.
[0057]
In addition, since the generation order of the pulses of the Hall ICs 52 and 54 differs depending on the normal rotation and reverse rotation of the worm wheel 38, it is possible to determine the normal rotation and reverse rotation by detecting that the pulse generation order is different. When the worm wheel 38 is reversed and the window glass 24 is lowered, the pinching prevention measure is unnecessary. Therefore, if it is determined that the rotation of the worm wheel 38 is reverse rotation, the control circuit for the pinching prevention measure is omitted. be able to.
[0058]
Furthermore, since it is possible to determine whether the worm wheel 38 is rotating forward or backward, it is known whether the window glass is at the rising limit edge or the falling limit edge. The count number can be reset, and by this reset, the correspondence between the pulse count number and the raising / lowering position of the window glass 24 can be obtained with high accuracy.
[0059]
An engagement recess 74 is formed inside the open end edge of the gear box 32, and an engagement protrusion 76 is formed on the outer peripheral edge of the annular portion 46 of the element substrate 44 corresponding to the engagement recess 74. The engagement convex part 76 engages with the joint concave part 74, and the element substrate 44 is positioned.
[0060]
In addition, a protrusion 78 is provided outside the open end edge of the gear box 32, and a locking piece 80 protrudes from the periphery of the motor cover 42 corresponding to the protrusion 78, and the locking piece 80 is caulked to the protrusion 78. Thus, the motor cover 42 is attached.
[0061]
The motor cover 42 has an outer shape similar to the outer shape of the element substrate 44 when viewed from the worm wheel shaft 40 direction, and a step is formed so as to form an element arrangement gap 51 such as a transistor between the element cover 44 and the motor cover 42. Is done.
[0062]
As shown in FIG. 4, one end of the worm wheel shaft 40 is pivotally supported by a bearing portion 82 that is recessed in the center of the motor cover 42, and the other end of the worm wheel shaft 40 is the bottom of the gear box 32. It is supported through the wall. The penetrating tip of the worm wheel shaft 40 is a connecting portion 84 with the drum 16.
[0063]
A mounting piece 86 protrudes radially outward from the gear box 32, and the drive motor 14 is connected to the door 12 by connecting means such as a bolt passing through the mounting piece 86. 12 is mounted.
[0064]
Next, the operation and effect of the present embodiment will be described.
[0065]
When the window glass raising / lowering switch 70 is operated, the drive motor 14 rotates forward and the window glass 24 is raised. If the window glass raising / lowering switch 70 is operated by the lowering switch, the drive motor 14 is reversed and the window glass 24 is lowered.
[0066]
On the other hand, a pulse is emitted from the Hall ICs 52 and 54 with the rotation of the drive motor 14, that is, with the rotation of the worm wheel 38. In the ECU (control unit), when the worm wheel 38 is rotated forward, the pulses are up-counted, and while the pulse count number does not reach the pulse count number n, a trapping prevention measure is taken, and the pulse count number is set to the pulse count number n. After reaching the motor control, the motor is controlled so as not to take a pinching prevention measure.
[0067]
Here, an element substrate 44 in which an ECU is incorporated is housed in the gear box 32, and the drive motor 14 is integrated with the ECU.
[0068]
Therefore, a case or a plaque dedicated to the ECU, which is required when the ECU is separately provided, is not necessary, and the number of components in the ECU is reduced.
[0069]
Further, the wiring between the motor body 26 and the ECU is shortened and simplified as compared with the case where the ECU is provided separately.
[0070]
Due to the integration with the ECU, even if a power relay for operating the motor is installed in the ECU, the motor power line is short and the wiring resistance is small, and the voltage drop based on the wiring resistance is suppressed. As a result, the drive motor can be reduced in size.
[0071]
In this way, the cost of the entire power window system is also reduced.
[0072]
Further, according to the configuration in which the Hall ICs 52 and 54 connected to the ECU are mounted on the element substrate 44, the wiring of the sensor signal can be shortened and simplified.
[0073]
Further, since the Hall ICs 52 and 54 are accommodated in the gear box 32 along with the element substrate 44 along the worm wheel axis 40 direction, the assembly direction of the worm wheel 38 to the gear box 32 and the Hall IC 52 to the gear box 32, The accommodation direction of 54 is substantially the same direction. Moreover, the mounting direction of the motor cover 42 is also the same direction as the element substrate 44 in the direction of the worm wheel shaft 40. Thus, workability at the time of assembling is improved by setting the assembling direction and the accommodating direction of the members such as the worm wheel 38, the motor cover 42, the element substrate 44, and the Hall ICs 52 and 54 to the same direction.
[0074]
In the main drive motor 14, the gear box 32, that is, the main drive motor 14 is attached to the door 12 through which the connecting means such as a bolt penetrates the attachment piece 86. Since the direction is the same as the direction of the worm wheel shaft 40, that is, the direction in which the element substrate 44 is assembled to the gear box 32, the gear box 32 remains attached to the door 12 with respect to the gear box 32. The element substrate 44 can be attached and detached.
[0075]
  Further, in the present drive motor 14, when viewed from the direction along the axial direction of the armature shaft 34, the terminal 62 is disposed in the hollow portion 60 where the terminal 62 is positioned on the substantially opposite side of the worm wheel 38 via the armature shaft 34. Is done. For this reason, the dimension of the gear box 32 along the direction of the worm wheel shaft 40 can be reduced as compared with the case where the terminal 62 is disposed laterally along the direction of the worm wheel shaft 40 with respect to the armature shaft 34. The drive motor 14 can be reduced in size and thickness.
In addition, since the element substrate 44 is disposed so as to straddle the worm 36 between the cavity portion 58 and the cavity portion 60, the element substrate 44 can be disposed close to the worm wheel 38 and the worm wheel 38 that meshes with the worm 36. As a result, the Hall ICs 52 and 54 mounted on the element substrate 44 can be disposed close to the magnet 50 provided on the worm wheel 38. Thereby, the magnetic fluctuation of the magnet 50 due to the rotation of the worm wheel 38 can be detected accurately and reliably by the Hall ICs 52 and 54, and the degree of freedom of arrangement of the Hall ICs 52 and 54 on the element substrate 44 is improved.
[0076]
Further, in the present drive motor 14, the ECU main body 56 attached to the element substrate 44 is accommodated in the cavity 58, and the terminal 62 attached to the element substrate 44 is accommodated in the cavity 60. As described above, the structure in which the ECU main body 56 and the terminal 62 on the element substrate 44 are accommodated in the hollow portions 58 and 60 makes the structure and assembly of the ECU main body 56 and the terminal 62 flat on the element substrate 44. You don't have to. Thereby, the area of the element substrate 44 can be reduced, and as a result, the element substrate 44 can be reduced in size.
[0077]
Further, in the drive motor 14, a part of the motor cover 42 is formed as a step as described above, whereby an element disposition gap 51 is formed between the motor cover 42 and the gear box 32. In the drive motor 14, the elements provided on the element substrate 44 are arranged in the element arrangement gap 51.
[0078]
In this way, by forming a step in part of the motor cover 42 to form the element disposition gap 51, the element substrate 44 is increased without increasing the thickness of the gear box 32 while increasing the mechanical strength of the motor cover 42. Can be accommodated efficiently.
[0079]
In the present drive motor 14, cavities 58 and 60 are formed on both sides of the armature shaft 34, respectively. Furthermore, the terminal 62 is accommodated in the cavity 60 located on the peripheral wall side of the gear box 32 among these cavities 58 and 60.
[0080]
As described above, the terminal 62 is accommodated in the hollow portion 60 on the peripheral wall side, so that, for example, a part of the peripheral wall of the gear box 32 corresponding to the hollow portion 60 is cut out to form the opening 64. Wirings 66 and 68 can be connected.
[0081]
Further, in the present drive motor 14, as described above, of the hollow portions 58, 60, the hollow portion 58 is between the portion accommodating the armature shaft 34 in the gear box 32 and the portion accommodating the worm wheel 38. Is formed. By adopting a structure in which the ECU main body 56 is accommodated in the cavity 58 formed at such a position, the ECU main body 56 is disposed in proximity to the worm wheel 38. Thereby, it is possible to reduce or eliminate a useless space in which no member is arranged in the gear box 32.
[0082]
For this reason, it is possible to reduce the size of the gear box 32 and, consequently, the overall size of the drive motor 14.
[0083]
The present invention is not limited to the above-described embodiments, and various modifications can be made without changing the gist.
[0084]
For example, in the above embodiment, the Hall ICs 52 and 54 as magnetic sensors detect the rotational position of the worm wheel 38 in a position corresponding to the worm wheel 38, but are not limited to this, and the base end of the armature shaft A magnet is provided on the outer periphery of the armature, and Hall ICs 52 and 54 are provided between the magnet and the substrate. Alternatively, a magnet is provided on the outer periphery of the tip of the armature shaft, and the Hall ICs 52 and 54 are provided between the magnet and the substrate. The rotational position of the armature shaft may be provided to detect the rotational position of the armature shaft, and other detections related to the rotation such as the rotational speed are not limited to the rotational position. Further, the magnetic sensor is limited to the Hall ICs 52 and 54. Is not to be done.
[0085]
In such a configuration, the drive motor can be used because the space on the side of the end of the motor body along the axial direction of the armature shaft can be used as a space for installing magnetic sensors such as Hall ICs 52 and 54. There is a merit that it contributes to downsizing.
[0086]
In the above embodiment, two Hall ICs are provided. However, the number is not limited, and may be one or three or more. When there are a plurality of Hall ICs, the pulse resolution is a multiple of the number of Hall ICs. Note that the pulse resolution increases as the number of poles of the magnet 50 increases.
[0087]
Further, the gear box 32 is provided with a worm gear composed of a worm 36 and a worm wheel 38, but is not limited thereto.
[0088]
Furthermore, the motor control by the ECU is not limited to the control in the above embodiment.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a power window drive motor according to an embodiment of the present invention.
FIG. 2 is a schematic perspective view of a power window.
FIG. 3 is a partially cutaway view of the armature shaft of the power window drive motor as seen from the direction perpendicular to the axis.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a wiring diagram of a power window according to the present embodiment.
FIG. 6 is a perspective view showing a control unit of a conventional power window drive motor.
FIG. 7 is a wiring diagram of a conventional power window.
[Explanation of symbols]
14 ... Power window drive motor, 24 ... Window glass (window), 26 ... Motor body, 32 ... Gear box, 34 ... Armature shaft, 36 ... Worm, 38 ... Worm wheel, 42 ... motor cover (cover), 44 ... element substrate (substrate), 46 ... annular part, 48 ... rectangular part, 51 ... element arrangement gap, 52, 54,. Hall IC (magnetic sensor), 56 ... ECU body (control unit), 58, 60 ... hollow portion, 62 ... terminal (connection terminal)

Claims (6)

A motor body that includes an armature shaft and that opens and closes the window by a driving force transmitted through a worm wheel that meshes with a worm provided on the armature shaft;
A gear box connected to the motor body and containing the armature shaft and the worm wheel;
A cover for closing the gear box;
A connection terminal that is arranged between the cover and the worm in the gear box so that a part thereof straddles the worm, incorporates a control unit that drives and controls the motor body, and is connected to an external circuit A substrate having a rectangular portion to which is attached;
A magnetic sensor mounted on the substrate and emitting a pulse as the motor body rotates;
Further, at least one of the control unit and the connection terminal attached to the rectangular part is between the base plate and the bottom wall of the gear box on the side in the rotational radial direction of the armature shaft. Housed in the formed cavity,
A power window drive motor characterized by that. A motor body that includes an armature shaft and that opens and closes the window by a driving force transmitted through a worm wheel that meshes with a worm provided on the armature shaft;
A cover for closing the gear box;
A rectangle in which a part is arranged between the cover and the worm so as to straddle the worm, a control unit for driving and controlling the motor body is incorporated, and a connection terminal connected to an external circuit is attached A substrate having a portion ;
A magnetic sensor mounted on the substrate and emitting a pulse as the motor body rotates;
A gear box that accommodates the motor main body and has a hollow portion that accommodates at least one of the connection terminal and the control unit attached to the rectangular portion on the side of the rotational radius direction of the armature shaft;
A power window drive motor comprising: The substrate is formed by including an annular portion formed continuously from the rectangular portion and disposed between the worm wheel and a cover for closing the gear box in a state of being opposed to the peripheral portion of the worm wheel. did,
The power window drive motor according to claim 1, wherein the power window drive motor is provided. A part of the cover that closes the gear box is stepped to form an element arrangement gap in which elements attached to the substrate are arranged between the cover and the bottom wall of the gear box.
The power window drive motor according to any one of claims 1 to 3, wherein the motor is a power window drive motor. The hollow portion is formed on both sides of the armature shaft, and the connection terminal is accommodated on the side located on the peripheral wall side of the gear box among the hollow portions.
The power window drive motor according to any one of claims 1 to 4, wherein the power window drive motor is provided. Forming at least a portion of the cavity adjacent to a housing portion of the worm wheel in the gear box;
The power window drive motor according to any one of claims 1 to 5, wherein the motor is a power window drive motor.

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