JP6580181B2 - Motor equipment - Google Patents

Description

  The present invention relates to a motor device having a rotating shaft.

  2. Description of the Related Art Conventionally, a motor device provided with a speed reduction mechanism capable of obtaining a large output while being small is used as a drive source such as a power window device and a sunroof device mounted on a vehicle such as an automobile. When the operator operates an operation switch provided in the vehicle interior or the like, the motor device is driven to rotate, whereby an opening / closing body such as a window glass or a sunroof is opened / closed.

  As a motor device provided with such a reduction mechanism, for example, a technique described in Patent Document 1 is known. A motor (motor device) described in Patent Document 1 includes a motor main body and a speed reduction unit, and a rotation shaft is rotatably accommodated in a yoke that forms the motor main body, and a gear that forms a speed reduction unit. A worm and a worm wheel that form a speed reduction mechanism are rotatably accommodated in the housing. In addition, a control circuit board on which a plurality of electric circuit components are mounted is provided in the gear housing, and the Hall element constituting the electric circuit components is opposed to the sensor magnet fixed to the rotating shaft, and the rotating shaft The rotation state is detected.

  The gear housing is formed with a board mounting port and a connector mounting port. The board mounting port is disposed on one side across the rotation shaft, and the connector mounting port is disposed on the other side across the rotation shaft. Then, the control circuit board is mounted from the board mounting port (one side), the control circuit board is screwed to the gear housing, the connector housing is mounted from the connector mounting port (the other side), and the connector housing is mounted. Screwed to the gear housing.

JP 2004-166481 A (FIGS. 1 and 2)

  By the way, since the motor device mounted on a vehicle such as an automobile as described above is installed in a narrow door or a roof, it is desirable to reduce the thickness and reduce the size and weight.

  However, according to the motor device described in Patent Document 1 described above, the control circuit board is provided so as to straddle the rotation shaft from one side of the rotation shaft to the other side of the rotation shaft. Therefore, not only the thickness dimension along the direction in which the control circuit board of the motor device extends is large, but also the thickness dimension along the direction in which the control circuit board of the motor apparatus and the rotating shaft overlap with each other is large, and thus the motor apparatus is further reduced in size and weight. It was difficult to meet the needs.

  Further, since the ratio of the control circuit board to the gear housing is large, when the fixing portion for fixing the motor device to the object to be attached is provided in the gear housing, the setting freedom is low, and consequently the object to be attached to the motor device. The layout has been degraded.

  An object of the present invention is to provide a motor device capable of reducing the size and weight of the motor device without deteriorating the layout property to the attachment object.

In one aspect of the present invention, an armature closed to coil the rotary shaft is wound, is formed into a bottomed cylindrical shape, and the motor case in which the armature is accommodated, a worm gear fixed to the rotary shaft, wherein A gear case formed along the axial direction of the rotating shaft and having a worm gear housing portion in which the worm gear is rotatably housed, a commutator fixed to the rotating shaft, and a plurality of brushes slidably contacted with the commutator are held. A brush body including a holder main body, and a bearing holder that is formed along the axial direction of the rotary shaft from the holder main body and is mounted with a bearing member that rotatably supports the rotary shaft ; and the rotary shaft A sensor magnet that is fixed and has a plurality of magnetic poles alternately provided along the rotation direction of the rotation shaft, and a gap on the radially outer side of the sensor magnet. A sensor board disposed on the sensor board, and a rotation sensor that is provided on the sensor board and detects a rotation state of the rotary shaft from a change in the magnetic pole accompanying rotation of the sensor magnet. A first magnetism extending about a shaft toward a radially outer side of the rotation shaft, wherein the rotation sensor changes in electrical resistance value according to a magnitude of a magnetic flux component along an extending direction of the sensor substrate. A resistance element, and a second magnetoresistive element whose electric resistance value changes according to the magnitude of a magnetic flux component along a direction orthogonal to the extending direction of the sensor substrate, and the rotation sensor is the sensor When viewed from the opposite side across the magnet, the rotation sensor is accommodated within the axial dimension and diameter dimension of the sensor magnet, and the electrical resistance value of the first magnetoresistive element and the first The electrical resistance of the magnetoresistive element, with the rotation of said rotary shaft, said are respectively changed by the change in magnetic flux component directed in the circumferential direction of the sensor magnet in the radial direction outside of the sensor magnet, the bearing holding tube The outer peripheral surface portion at the tip portion is supported by the worm gear housing portion together with the bearing member, and the holder body is supported by the opening portion of the motor case .

In another aspect of the present invention, the sensor board is provided on a connector member to which an external connector is connected , and the connector member is assembled to a housing that houses the rotating shaft from the outside in the radial direction of the rotating shaft. Tei Ru.

In another aspect of the present invention, the end face at the tip portion of the bearing holding tube, the are closed by the rotation shaft and the bearing member, a partition wall is provided between the rotation sensor and the sensor magnet Tei The

  According to the present invention, the motor device can be further reduced in size and weight without degrading the layout property to the attachment object.

It is a fragmentary sectional view showing a motor device concerning one embodiment of the present invention. It is a partial expanded sectional view which expands and shows the broken-line circle | round | yen A part of FIG. It is a perspective view which shows the connector member of the motor apparatus of FIG. (A), (b) is explanatory drawing explaining the arrangement | positioning relationship between a sensor magnet and a sensor board | substrate. It is explanatory drawing explaining the internal structure of a rotation sensor. It is explanatory drawing which shows multiple relative positions of the sensor magnet with respect to a rotation sensor, and demonstrates the detection state of the magnetic flux component by the rotation sensor in each position. It is explanatory drawing explaining the detection signal of the magnetic flux component by a rotation sensor, and the output signal of a rotation sensor. It is explanatory drawing explaining the assembly procedure of the motor apparatus of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a partial cross-sectional view showing a motor device according to an embodiment of the present invention, FIG. 2 is an enlarged partial cross-sectional view showing a broken-line circle A portion of FIG. 1, and FIG. 3 is a motor device of FIG. The perspective view which shows these connector members is shown, respectively.

  A motor device 10 shown in FIG. 1 is used as a drive source of a power window device (not shown) mounted on a vehicle such as an automobile, and drives a window regulator (not shown) that moves the window glass up and down. . The motor device 10 is formed as a motor with a speed reduction mechanism capable of large output even though it is small, and is installed in a narrow space (not shown) formed in the door of the vehicle. The motor device 10 includes a motor unit 20 and a gear unit 40. The motor unit 20 and the gear unit 40 are connected to each other by a plurality of fastening screws 11 (two in the drawing) and are unitized. .

  The motor unit 20 includes a motor case 21 formed into a bottomed cylindrical shape by pressing (deep drawing) a steel plate made of a magnetic material. A plurality of magnets 22 (two in the figure) having a substantially arc-shaped cross section are fixed to the inner wall of the motor case 21, and an armature 24 around which a coil 23 is wound is provided inside each magnet 22. It is rotatably accommodated through a predetermined gap. A brush holder 25 is attached to the opening side (left side in the figure) of the motor case 21, and the opening side of the motor case 21 is closed by the brush holder 25.

  An armature shaft 26 as a rotation axis is fixed through the rotation center C1 of the armature 24. The armature shaft 26 is provided so as to cross both the motor unit 20 and the gear unit 40, and one end side (right side in the drawing) of the armature shaft 26 is disposed inside the motor case 21. The other end side in the direction (left side in the figure) is disposed inside the gear case 41.

  A commutator 27 is fixed to a substantially intermediate portion along the axial direction of the armature shaft 26 and a portion close to the armature 24. The end of the coil 23 wound around the armature 24 is electrically connected to the commutator 27.

  A plurality of brushes 28 (two in the drawing) held by the brush holder 25 are slidably contacted with the outer periphery of the commutator 27, and each brush 28 has a predetermined pressure toward the commutator 27 by a spring member 29. In elastic contact. As a result, when a driving current is supplied to each brush 28 from a controller (not shown), a rotational force (electromagnetic force) is generated in the armature 24. As a result, the armature shaft 26 rotates at a predetermined rotational speed and rotational torque. ing.

  A sensor magnet 30 is fixed to a substantially intermediate portion along the axial direction of the armature shaft 26 and on the side opposite to the armature 24 side of the commutator 27. The sensor magnet 30 is formed in an annular shape by alternately arranging four magnetic poles (see FIG. 4) along the rotation direction of the armature shaft 26. The sensor magnet 30 is configured to rotate integrally with the armature shaft 26. Therefore, as the armature shaft 26 rotates, the state of magnetic flux lines with respect to the rotation sensor 70 disposed on the radially outer side of the sensor magnet 30 changes. (See FIG. 6).

  A worm gear 31 is provided on the other end side in the axial direction than the sensor magnet 30 of the armature shaft 26. The worm gear 31 is formed in a substantially cylindrical shape and is fixed to the armature shaft 26 by press-fitting. The worm gear 31 meshes with a tooth portion 42 a of a worm wheel 42 that is rotatably provided in the gear case 41. As a result, the worm gear 31 rotates in the gear case 41 as the armature shaft 26 rotates, and the rotation is transmitted to the worm wheel 42. Here, the worm gear 31 and the worm wheel 42 form a speed reduction mechanism SD.

  The bottom side (right side in the figure) of the motor case 21 is formed in a stepped shape, and a small-diameter portion 21a having a smaller diameter than the main body portion of the motor case 21 is provided in the portion. A first radial bearing 32 and a first thrust bearing 33 are mounted on the small-diameter portion 21a. These bearings 32 and 33 rotatably support one end side of the armature shaft 26 in the axial direction.

  As shown in FIG. 2, the brush holder 25 is formed into a predetermined shape by injection molding a resin material such as plastic, and includes a holder main body 25a and a bearing holding cylinder 25b. The holder main body 25a holds the plurality of brushes 28 movably and is attached to the opening portion of the motor case 21 (see FIG. 1). On the other hand, the bearing holding cylinder 25b is formed in a cylindrical shape and protrudes from the holder main body 25a toward the gear case 41 side (left side in the figure).

  A second radial bearing 34 that rotatably supports a substantially intermediate portion along the axial direction of the armature shaft 26 is attached to the tip portion of the bearing holding cylinder 25b. That is, the armature shaft 26 penetrates inside the bearing holding cylinder 25b. The sensor magnet 30 fixed to the armature shaft 26 is disposed inside the bearing holding cylinder 25b, and rotates together with the armature shaft 26 inside the bearing holding cylinder 25b.

  Here, the bearing holding cylinder 25 b constitutes a partition wall in the present invention, and the bearing holding cylinder 25 b is provided between the sensor magnet 30 and the rotation sensor 70. As described above, by providing the bearing holding cylinder 25b functioning as a partition wall between the sensor magnet 30 and the rotation sensor 70, the wear powder of each brush 28 on the sensor magnet 30 side causes the rotation sensor 70 and the rotation sensor to move. 70 is prevented from adhering to the sensor substrate 60 on which 70 is mounted. Thereby, it can suppress over the long term that the detection performance of the rotation sensor 70 falls.

  As shown in FIG. 1, the gear unit 40 includes a gear case (housing) 41 and a connector member 50. The opening side (front side in the figure) of the gear case 41 is sealed by a gear cover (not shown). The gear case 41 that forms the gear portion 40 is formed in a predetermined shape from a resin material, and is connected to the opening side of the motor case 21 via the brush holder 25.

  Inside the gear case 41, there are formed a worm gear housing portion 41a extending along the axial direction of the armature shaft 26 and a worm wheel housing portion 41b disposed in the vicinity of the worm gear housing portion 41a. Inside each of these accommodating portions 41a and 41b, a worm gear 31 and a worm wheel 42 having a tooth portion 42a meshing with the worm gear 31 on the outer peripheral portion are accommodated rotatably. Here, the worm gear 31 is formed in a spiral shape, and the tooth portion 42 a is inclined at a gentle inclination angle toward the axial direction of the worm wheel 42. Thereby, smooth power transmission from the worm gear 31 to the worm wheel 42 is possible.

  An output shaft 42b is disposed at the rotation center C2 of the worm wheel 42, and the output shaft 42b is connected to a window regulator (not shown) so that power can be transmitted. That is, the rotation of the armature shaft 26 is decelerated by the speed reduction mechanism SD to increase the torque, and is output from the output shaft 42b to the window regulator.

  A third radial bearing 43 and a second thrust bearing 44 are provided on the side (left side in the figure) opposite to the motor case 21 side along the axial direction of the armature shaft 26 of the worm gear housing portion 41a. The third radial bearing 43 and the second thrust bearing 44 rotatably support the other axial end side of the armature shaft 26.

  A rubber bush 45 is provided on the opposite side of the second thrust bearing 44 to the armature shaft 26 side, and the rubber bush 45 presses the second thrust bearing 44 toward the armature shaft 26 with a relatively weak force. It is like that. This suppresses the armature shaft 26 from rattling in the axial direction while suppressing an increase in rotational resistance of the armature shaft 26.

  As described above, one end of the armature shaft 26 in the axial direction is rotatably supported by the first radial bearing 32 and the first thrust bearing 33, and a substantially intermediate portion along the axial direction of the armature shaft 26 is supported by the second radial bearing 34. The other end of the armature shaft 26 in the axial direction is rotatably supported by a third radial bearing 43 and a second thrust bearing 44. Thereby, the armature shaft 26 can rotate smoothly.

  The gear case 41 is further provided with a stepped connector member mounting hole 41c. The connector member mounting hole 41c is disposed in the vicinity of the brush holder 25 and on the side opposite to the worm wheel housing portion 41b side with the armature shaft 26 interposed therebetween. The connector member mounting hole 41c extends in the radial direction of the armature shaft 26, and the connector member 50 separate from the gear case 41 is inserted into and fixed to the connector member mounting hole 41c. Yes.

  Here, the extension direction of the connector member mounting hole 41c will be described in more detail. When the axial direction of the armature shaft 26 is the X-axis direction and the axial direction of the output shaft 42b is the Z-axis direction (the drawing depth direction), The extending direction of the connector member mounting hole 41c is a Y-axis direction that is perpendicular to both the X-axis direction and the Z-axis direction. Note that the X-axis direction and the Y-axis direction indicate the vertical and horizontal width directions of the motor device 10, and the Z-axis direction indicates the thickness direction of the motor device 10.

  As shown in FIG. 2, a pair of drive conductive members 25 c (one in the drawing) protruding from the brush holder 25 are exposed inside the connector member mounting hole 41 c. Each drive conductive member 25c is formed in a rod shape from brass or the like having excellent conductivity, and one end side of each drive conductive member 25c is electrically connected to each brush 28. Further, the other end side of each drive conductive member 25 c is electrically connected to one end side of a pair of power supply terminals 53 provided on the connector member 50.

  Here, just by inserting the connector member 50 into the connector member mounting hole 41c, one end side of each power supply terminal 53 is automatically electrically connected to the other end side of each driving conductive member 25c. Yes.

  As shown in FIG. 1, the gear case 41 is provided with three fixing portions 41d. Each fixing portion 41d is arranged at a predetermined interval (approximately 120 ° interval) around the gear case 41 so as to surround the output shaft 42b. And each fixing | fixed part 41d is each mounted | worn with the fixing bolt (not shown) for fixing the motor apparatus 10 in the door of a vehicle. In this way, by providing the fixing portions 41d at predetermined intervals so as to surround the output shaft 42b, the motor device 10 can be supported in a well-balanced manner in the narrow door, and as a result, the motor device 10 has a high load. Even if it is applied, it is possible to effectively prevent the motor device 10 from wobbling in the door.

  As shown in FIGS. 1 and 3, the connector member 50 is formed in a substantially L shape by injection molding a resin material such as plastic, and includes a connector connecting portion 51 and an insertion portion 52. An external connector CN (see FIG. 1) on the vehicle side is connected to the connector connecting portion 51, and the insertion portion 52 is inserted into the connector member mounting hole 41c of the gear case 41. Here, the external connector CN is electrically connected to a battery, a controller and the like (none of which are shown) mounted on the vehicle.

  A pair of power supply terminals 53 and four signal terminals 54 are inserted (embedded) inside the connector connection portion 51 and the insertion portion 52. Each power terminal 53 and each signal terminal 54 are formed in a substantially L shape along the shape of the connector member 50 by using brass or the like having excellent conductivity. Further, each power terminal 53 is thicker than each signal terminal 54, because a larger current flows through each power terminal 53 than each signal terminal 54.

  One end side of each power supply terminal 53 protrudes from the insertion portion 52 and is exposed to the outside. The exposed portion is a slit into which the other end side of each drive conductive member 25c (see FIG. 2) is inserted. SL is formed. Here, in FIG. 3, only the slit SL of one power supply terminal 53 is shown. Further, the other end side of each power terminal 53 is exposed inside the connector connecting portion 51, and is thereby electrically connected to each power terminal (not shown) on the external connector CN side. ing.

  One end side of each signal terminal 54 is electrically connected to a sensor substrate 60 provided in the insertion portion 52. On the other hand, the other end side of each signal terminal 54 is exposed inside the connector connecting portion 51, similarly to the other end side of each power supply terminal 53. Thereby, the other end side of each signal terminal 54 is electrically connected to each signal terminal (not shown) on the external connector CN side.

  A seal member 55 made of an elastic member such as rubber is provided on the connector connection portion 51 side of the insertion portion 52, and the seal member 55 is attached so as to surround the periphery of the insertion portion 52. The seal member 55 is arranged between the insertion portion 52 and the connector member mounting hole 41c with the connector member 50 mounted on the gear case 41 (see FIG. 1). This prevents rainwater, dust, and the like from entering from the outside of the gear case 41 toward the inside of the connector member mounting hole 41c.

  A sensor substrate 60 is integrally provided in the insertion portion 52. The sensor substrate 60 is formed in a substantially rectangular shape, and includes a pair of long sides 61 and a pair of short sides 62. One short side 62 side of the sensor substrate 60 is fixed to the insertion portion 52, whereby each short side 62 faces along the Y-axis direction, and each long side 61 faces along the Z-axis direction. ing.

  One end side of the four signal terminals 54 is electrically connected to one short side 62 side of the sensor substrate 60, and the rotation sensor 70 is mounted on the other short side 62 side of the sensor substrate 60. Has been. That is, as shown in FIGS. 1 and 2, the sensor substrate 60 has the connector member 50 attached to the gear case 41 and is directed radially outward of the armature shaft 26 around the armature shaft 26. Has been extended.

  Here, the positional relationship between the sensor magnet 30 fixed to the armature shaft 26 and the sensor substrate 60 on which the rotation sensor 70 is mounted will be described in more detail with reference to the drawings.

  FIGS. 4A and 4B are explanatory views for explaining the positional relationship between the sensor magnet and the sensor substrate.

  As shown in FIG. 4, the other short side 62 side of the sensor substrate 60 is disposed on the radially outer side of the sensor magnet 30 via a gap SP, and in this gap SP, a bearing holding functioning as a partition wall is provided. A cylinder 25b is arranged. Here, the dimension of the gap SP is set to a dimension that satisfies the following three conditions. That is, sufficient detection performance can be obtained by bringing the rotation sensor 70 as close as possible to the sensor magnet 30. When the sensor magnet 30 rotates, the sensor magnet 30 does not contact the bearing holding cylinder 25b, and the insertion portion 52 is attached to the connector member. The sensor substrate 60 and the bearing holding cylinder 25b are not in contact with each other when inserted into the hole 41c.

  As shown in FIG. 4A, the thickness dimension t1 along the axial direction of the armature shaft 26 of the sensor substrate 60 including the rotation sensor 70 is the thickness along the axial direction (X-axis direction) of the armature shaft 26 of the sensor magnet 30. It is set to dimension t2 or less. That is, the sensor substrate 60 including the rotation sensor 70 is within the range of the axial dimension (= t2) of the sensor magnet 30 when viewed from the viewing point LP on the opposite side across the sensor magnet 30 (shaded in the drawing). The rotation sensor 70 is within the range of the axial dimension (= t2) of the sensor magnet 30 when viewed from the visual point LP (within the shaded range in the figure). Placed in.

  Thereby, it is possible to suppress an increase in the dimension of the motor device 10 along the axial direction (X-axis direction) of the armature shaft 26, that is, the width dimension of the motor device 10, thereby realizing a reduction in size of the motor device 10. Yes.

  As shown in FIG. 4B, the width dimension w1 along the direction in which the short side 62 of the sensor substrate 60 including the rotation sensor 70 extends is the radial direction of the armature shaft 26 of the sensor magnet 30 (Y-axis direction / Z It is set to a thickness dimension w2 or less along (axial direction). That is, the sensor substrate 60 including the rotation sensor 70 is within the range of the diameter dimension (= w2) of the sensor magnet 30 when viewed from the viewing point LP on the opposite side across the sensor magnet 30 (shaded range in the figure). The rotation sensor 70 is disposed within the range of the diameter dimension (= w2) of the sensor magnet 30 (within the shaded range in the figure) when viewed from the viewing point LP. Is done.

  Thereby, it is possible to suppress an increase in the dimension of the motor device 10 along the axial direction (Z-axis direction) of the output shaft 42b (see FIG. 1), that is, the thickness dimension of the motor device 10, and the motor device 10 is thin. Has been realized.

  Next, the structure and operation of the rotation sensor 70 will be described in detail with reference to the drawings.

  FIG. 5 is an explanatory diagram for explaining the internal structure of the rotation sensor, and FIG. 6 schematically shows a plurality of relative positions of the sensor magnet with respect to the rotation sensor, and an explanation for explaining the detection state of the magnetic flux component by the rotation sensor at each position. FIG. 7 is an explanatory diagram for explaining the detection signal of the magnetic flux component by the rotation sensor and the output signal of the rotation sensor.

  As shown in FIG. 5, the rotation sensor 70 is a magnetic sensor that captures changes in the magnetic poles (S pole / N pole) of the sensor magnet 30 facing the rotation sensor 70, that is, the direction of the magnetic flux lines and changes thereof. . Thereby, the rotation sensor 70 can detect the rotation state of the armature shaft 26 (see FIG. 4), that is, the rotation direction and the rotation speed of the armature shaft 26. Specifically, the rotation sensor 70 includes a magnetoresistive element (MR element) as a sensor element, and is a GMR sensor to which a giant magnetoresistive effect (Giant Magneto Resistance Effect) is applied.

  The rotation sensor 70 includes a Y-axis direction element (first MR element) 71 whose electrical resistance value changes according to the magnitude of the magnetic flux component along the Y-axis direction, and the magnitude of the magnetic flux component along the Z-axis direction. And a Z-axis direction element (second MR element) 72 whose electric resistance value changes. The rotation sensor 70 further includes a waveform conversion circuit 73, and the waveform conversion circuit 73 is inputted with sine wave signals (see FIG. 7) from the Y-axis direction element 71 and the Z-axis direction element 72, respectively. It has become. The waveform conversion circuit 73 converts each input sine wave signal (Y-axis direction magnetic flux component / Z-axis direction magnetic flux component) into a rectangular wave signal and outputs it.

  As shown in FIGS. 6 and 7, when the sensor magnet 30 is at the reference position of “0 °” with respect to the rotation sensor 70 (the positional relationship shown in FIG. 4B), Magnetic flux lines pass only along the substantially Z-axis direction. Therefore, in this state, the Z-axis direction magnetic flux component, that is, the magnetic field strength H along the Z-axis direction is maximized, and the output of the Z-axis direction element 72 is maximized. On the other hand, the magnetic flux component in the Y-axis direction, that is, the magnetic field strength H along the Y-axis direction is minimized, and the output of the Y-axis direction element 71 is minimized. Here, when the “magnetic flux vector amount” indicated by the broken-line arrow in FIG. 6 is decomposed, the “Y-axis direction magnetic flux component” indicated by the black arrow and the “Z-axis direction magnetic flux component” indicated by the white arrow are obtained.

  When the sensor magnet 30 is at the “90 °” position with respect to the rotation sensor 70, contrary to the above, a magnetic flux line passes through the rotation sensor 70 only substantially in the Y-axis direction. Furthermore, the direction of the magnetic flux lines is directed to the south pole of the sensor magnet 30. Therefore, in this state, the Y-axis direction magnetic flux component, that is, the magnetic field strength H along the Y-axis direction is maximized on the negative side, and the output of the Y-axis direction element 71 is maximized on the negative side. On the other hand, the magnetic flux component in the Z-axis direction, that is, the magnetic field strength H along the Z-axis direction is minimized, and the output of the Z-axis direction element 72 is minimized.

  When the sensor magnet 30 is at a position “−90 °” with respect to the rotation sensor 70, a magnetic flux line passes through the rotation sensor 70 only along the substantially Y-axis direction. The direction of is opposite to the case of “90 °”. Therefore, in this state, the Y-axis direction magnetic flux component, that is, the magnetic field strength H along the Y-axis direction is maximized on the positive side, and the output of the Y-axis direction element 71 is maximized on the positive side. On the other hand, the magnetic flux component in the Z-axis direction, that is, the magnetic field strength H along the Z-axis direction is minimized, and the output of the Z-axis direction element 72 is minimized.

  As described above, the Y-axis direction element 71 and the Z-axis direction element 72 of the rotation sensor 70 have two types of sine wave signals (solid line / dashed line) having a phase difference of 90 ° as shown in the upper part of FIG. Are each output. Thereafter, these sine wave signals are input to the waveform conversion circuit 73, and the waveform conversion circuit 73 has two types of rectangular wave signals (OUT1 / OUT2) having a phase difference of 90 ° as shown in the lower part of FIG. ), And the generated two types of rectangular wave signals are output.

  Here, the waveform conversion circuit 73 includes a first threshold value th1 on the positive side and a second threshold value th2 on the negative side. By comparing the two types of sine wave signals with the respective threshold values th1 and th2, The rising point and falling point of the rectangular wave signal (OUT1 / OUT2) are determined.

  In this manner, the rotation sensor 70 outputs two types of rectangular wave signals having a phase difference of 90 °, and these rectangular wave signals are input to a controller (not shown) mounted on the vehicle. ing. And a controller grasps | ascertains the rotation direction and rotational speed of the sensor magnet 30, ie, the armature shaft 26, by monitoring the rising timing and falling timing of each rectangular wave signal, and controls rotation of the motor apparatus 10 based on this. It is supposed to be.

  Next, the assembly procedure of the motor apparatus 10 formed as described above will be described in detail with reference to the drawings.

  FIG. 8 shows an explanatory view for explaining the assembly procedure of the motor device of FIG.

  First, the motor unit 20 in which the armature 24 and the brush holder 25 are assembled to the motor case 21 is prepared, and the gear case 41 is prepared. Then, as indicated by an arrow (1) in the figure, the worm gear 31 forming the motor unit 20 is caused to face the worm gear housing portion 41a of the gear case 41, and the worm gear 31 is inserted into the worm gear housing portion 41a. Thereafter, the brush holder 25 is abutted against the gear case 41. Next, as shown by an arrow (2) in the figure, the fastening screw 11 is screwed to the gear case 41 using a fastening tool (not shown), so that the motor case 21 and the gear case 41 are connected and integrated.

  Thereafter, as indicated by an arrow (3) in the figure, the insertion portion 52 side of the connector member 50, that is, the sensor substrate 60 side is caused to face the connector member mounting hole 41c. Then, the insertion portion 52 is inserted into the connector member mounting hole 41c, whereby the other end side of each driving conductive member 25c is inserted into the slit SL (see FIG. 3) on one end side of each power supply terminal 53, Electrically connected. In this way, the connector member 50 is incorporated into the gear case 41 from the radially outer side of the armature shaft 26, and the mounting of the connector member 50 to the gear case 41 is completed.

  Here, since the seal member 55 is fitted into the connector member mounting hole 41c, the connection strength between the connector member 50 and the gear case 41 is sufficient, but the connection strength between the connector member 50 and the gear case 41 is stronger. For this reason, both may be fixed by a fastening screw (not shown).

  Next, the worm wheel 42 is accommodated in the worm wheel accommodating portion 41b of the gear case 41 from the opening side of the gear case 41, and the opening side of the gear case 41 is further sealed with a gear cover (not shown). Thereby, the motor apparatus 10 is completed. However, the worm wheel 42 may be housed inside the worm wheel housing portion 41b before the connector member 50 is inserted and fixed in the gear case 41.

  As described above in detail, according to the motor device 10 according to the present embodiment, the rotation sensor 70 that is disposed on the radially outer side of the sensor magnet 30 via the gap SP and detects the rotation state of the armature shaft 26 is provided. The sensor substrate 60 is provided so as to extend outwardly in the radial direction of the armature shaft 26 around the armature shaft 26. Therefore, it is not necessary to provide the sensor substrate 60 so as to straddle the armature shaft 26 as before.

  Therefore, the thickness dimension of the motor device 10 along the direction (Z-axis direction) intersecting the direction in which the sensor substrate 60 extends can be reduced, and the motor device 10 can be further reduced in size and weight.

  In addition, since the sensor substrate 60 can be gathered more compactly than before, the ratio of the sensor substrate 60 to the gear case 41 can be reduced, and the degree of freedom of arrangement of the fixing portion 41d with respect to the gear case 41 can be improved. Therefore, it is possible to improve the layout of the motor device 10 on the object to be attached.

  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, in the above-described embodiment, the rotation sensor employs one GMR sensor having two MR elements that react to the magnetic flux lines formed by the sensor magnet 30, but the present invention is not limited to this. Two inexpensive MR sensors having one MR element may be employed. Furthermore, other magnetic sensors (such as Hall IC) can be employed.

  In the above embodiment, the motor device 10 is used as a drive source of a power window device mounted on a vehicle. However, the present invention is not limited to this, and other drive sources such as a sunroof device. Can also be used.

DESCRIPTION OF SYMBOLS 10 Motor apparatus 11 Fastening screw 20 Motor part 21 Motor case 21a Small diameter part 22 Magnet 23 Coil 24 Armature 25 Brush holder 25a Holder main body 25b Bearing holding cylinder (partition wall)
25c Conductive member for driving 26 Armature shaft (rotating shaft)
27 Commutator 28 Brush 29 Spring Member 30 Sensor Magnet 31 Worm Gear 32 First Radial Bearing 33 First Thrust Bearing 34 Second Radial Bearing 40 Gear Portion 41 Gear Case (Housing)
41a Worm gear accommodating portion 41b Worm wheel accommodating portion 41c Connector member mounting hole 41d Fixed portion 42 Worm wheel 42a Tooth portion 42b Output shaft 43 Third radial bearing 44 Second thrust bearing 45 Rubber bushing 50 Connector member 51 Connector connecting portion 52 Inserting portion 53 Power terminal 54 Signal terminal 55 Seal member 60 Sensor board 61 Long side 62 Short side 70 Rotation sensor 71 Y-axis direction element 72 Z-axis direction element 73 Waveform conversion circuit CN External connector LP Visual point SD Deceleration mechanism SL Slit SP Gap

Claims (3)

An armature have a rotation axis coil is wound,
A motor case formed in a bottomed cylindrical shape and containing the armature;
A worm gear fixed to the rotating shaft;
A gear case having a worm gear housing portion formed along the axial direction of the rotating shaft and in which the worm gear is rotatably housed;
A commutator fixed to the rotating shaft;
A holder main body that holds a plurality of brushes that are slidably contacted with the commutator, and a bearing holder that is formed along the axial direction of the rotary shaft from the holder main body and rotatably supports the rotary shaft. A brush holder with a cylinder;
A sensor magnet fixed to the rotating shaft and provided with a plurality of magnetic poles alternately along the rotating direction of the rotating shaft;
A sensor substrate disposed via a gap on the outside in the radial direction of the sensor magnet;
A rotation sensor provided on the sensor substrate for detecting a rotation state of the rotation shaft from a change in the magnetic pole accompanying rotation of the sensor magnet;
With
The sensor substrate extends toward the radially outer side of the rotating shaft around the rotating shaft,
The rotation sensor includes a first magnetoresistive element whose electric resistance value changes according to the magnitude of a magnetic flux component along the extending direction of the sensor substrate, and a magnetic flux along a direction orthogonal to the extending direction of the sensor substrate. A second magnetoresistive element whose electrical resistance value changes according to the size of the component,
When the rotation sensor is viewed from the opposite side across the sensor magnet, the rotation sensor is accommodated within the range of the axial dimension and the diameter dimension of the sensor magnet,
A magnetic flux in which the electrical resistance value of the first magnetoresistive element and the electrical resistance value of the second magnetoresistive element are directed radially outward of the sensor magnet in the circumferential direction of the sensor magnet as the rotating shaft rotates. It has been changed by the change of each component,
The outer peripheral surface portion at the tip portion of the bearing holding cylinder is supported by the worm gear housing portion together with the bearing member,
The holder body is supported by an opening portion of the motor case,
Motor device. The motor device according to claim 1,
The sensor substrate is provided on the connector member external connector is connected, said connector member, Ru Tei assembled from the outside in the radial direction of the rotary shaft in a housing for housing the rotary shaft, the motor unit. In the motor device according to claim 1 or 2,
End surface at the tip portion of the bearing holding tube, the are closed by the rotation shaft and the bearing member, Ru Tei partition wall is provided between the rotation sensor and the sensor magnet, the motor device.

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