JP2019106889A - Motor device - Google Patents

Abstract

To make a motor device smaller and lighter without reducing layout properties to an object to be mounted.SOLUTION: A connector member 50 is formed in a substantially L shape by a resin material. Inside a connector member mounting hole 41c, a drive conductive member 25c, one end of which is electrically connected to a brush, the other end of which is electrically connected to a power supply terminal 53, projected from a brush holder 25, is exposed. The power supply terminal 53 is formed with a slit into which the drive conductive member 25c is inserted. The power supply terminal 53 and a signal terminal are formed in a substantially L shape along a shape of the connector member 50. With the connector member 50 inserted and fixed in the connector member mounting hole 41c, a sensor substrate 60 side of each of the power supply terminal 53 and the signal terminal is offset in an axial direction of an armature shaft 26 and the signal terminal is disposed closer to the brush than the power supply terminal 53.SELECTED DRAWING: Figure 8

Description

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

  Conventionally, as a drive source of a power window device mounted on a vehicle such as an automobile or a sunroof device, a motor device provided with a reduction mechanism capable of obtaining a large output while being compact is used. Then, the motor device is rotationally driven by operating the operation switch provided in the vehicle compartment etc. by the operator, whereby the opening / closing body such as the window glass or the sunroof is driven to open and close.

  As a motor apparatus provided with such a reduction gear mechanism, the technique described in patent document 1 is known, for example. A motor (motor device) described in Patent Document 1 includes a motor main body and a speed reduction portion, and a rotation shaft is rotatably accommodated in a yoke forming the motor main body, and a gear forming the speed reduction portion. In the housing, a worm and a worm wheel that form a speed reduction mechanism are rotatably accommodated. 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 faces the sensor magnet fixed to the rotation shaft, and the rotation shaft is rotated. It detects the rotation state of the

  The gear housing is formed with a board mounting port and a connector mounting port. The board mounting port is disposed on one side of the rotating shaft, and the connector mounting port is disposed on the other side of the rotating shaft. Then, mount the control circuit board from the board mounting port (one side), screw the control circuit board to the gear housing, mount the connector housing from the connector mounting port (the other side), and mount the connector housing Screwed to the gear housing.

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

  By the way, since the motor apparatus mounted in vehicles, such as the above-mentioned motor vehicles, is installed in a narrow door and in a roof, it is desirable to attain thickness reduction further by achieving size reduction and weight reduction.

  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 axis from one side sandwiching the rotation axis toward the other side sandwiching the rotation axis. 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 device and the rotation axis overlap, thereby reducing the size and weight of the motor device It was difficult to meet the needs.

  In addition, since the ratio of the control circuit board to the gear housing is large, the setting freedom is low when the fixing portion for fixing the motor device to the mounting object is provided in the gear housing, and consequently the mounting object of the motor device This has caused a reduction in the layout of the

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

  In one aspect of the present invention, there is provided a motor device comprising: a motor portion; and a gear portion having a connector member to which an external connector is connected, wherein the motor portion has a tubular motor case, A plurality of magnets fixed to an inner wall of a motor case, an armature which is accommodated in the motor case and on which a coil is wound, a rotating shaft fixed to a rotation center of the armature, and fixed to the rotating shaft; A sensor magnet in which a plurality of magnetic poles of N and S poles are alternately provided along the rotation direction of the rotation shaft, a commutator fixed to the rotation shaft, and a plurality of brushes slidingly contacted with the commutator; The brush holder holding the plurality of brushes and having a driving conductive member electrically connected to each of the plurality of brushes, the brush being attached to the opening portion of the motor case And the gear portion is formed along an axial direction of the rotation shaft, the worm gear fixed to the rotation shaft, a worm wheel engaged with the worm gear, and the worm gear being rotatably accommodated A worm gear accommodating portion, a worm wheel accommodating portion continuously provided to the worm gear accommodating portion, and rotatably accommodating the worm wheel, a connector member mounting hole into which the connector member is inserted and fixed, and the connector And a gear case connected to the motor case and having a conductive member connection hole in which the drive conductive member is projected, the connector member being substantially L-shaped by a resin material. The power supply terminal, the signal terminal, and the sensor magnet are formed in a shape. And a sensor substrate having a magnetic sensor disposed facing to electrically connect and fix the signal terminal, wherein the connector member is inserted and fixed in the connector member mounting hole; The signal terminal is formed in a substantially L-shape, and the power supply terminal is formed with a slit into which the driving conductive member is inserted at its tip, and the driving conductive member is inserted into the slit , The power terminal and the driving conductive member are electrically connected, and the power terminal and the signal terminal inserted into the conductive member connecting hole are the brush in which the signal terminal is closer to the brush than the power terminal. Are placed close to.

  In another aspect of the present invention, the sensor substrate includes a pair of long sides and a pair of short sides, and is formed in a substantially rectangular shape, and the pair of short sides is an axis of the rotation axis. It is disposed opposite to the direction orthogonal to the direction.

  In another aspect of the present invention, one end of the signal terminal is connected to one short side of the sensor substrate, and the magnetic sensor is provided on the other short side of the sensor substrate. There is.

  In another aspect of the present invention, the power supply terminal is formed wider than the signal terminal.

  In another aspect of the present invention, the sensor substrate is mounted with a rotation sensor that detects a change in the magnetic flux component of the magnetic pole caused by the rotation of the sensor magnet to detect the rotation state of the rotation shaft; The rotation sensor is extended outward in the radial direction of the rotation shaft, and the rotation sensor changes its electric resistance value according to the magnitude of the magnetic flux component of the magnetic pole along the extending direction of the sensor substrate. One component having a first magnetoresistance element, and a second magnetoresistance element whose electric resistance value changes according to the magnitude of the magnetic flux component of the magnetic pole along the direction orthogonal to the extending direction of the sensor substrate The largest surface of the plurality of surfaces forming the rotation sensor is provided to face the sensor substrate, and the rotation sensor is viewed from the opposite side across the sensor magnet, Said rotation sensor The electric resistance value of the first magnetoresistance element and the electric resistance value of the second magnetoresistance element are contained in the range of the axial dimension and the diameter size of the sensor magnet; With the change of the magnetic flux component of the magnetic pole toward the circumferential direction of the sensor magnet outside the sensor magnet in the radial direction.

  According to the present invention, it is possible to reduce the size and weight of the motor device without reducing the layout property to the mounting object.

It is a fragmentary sectional view showing a motor device concerning a 1 embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view showing a broken circle A in FIG. 1 in an enlarged manner. 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 of a sensor magnet and a sensor board | substrate. It is an explanatory view explaining an internal structure of a rotation sensor. It is explanatory drawing which shows typically 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 an explanatory view explaining a detection signal of a magnetic flux component by a rotation sensor, and an 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 sectional view showing a motor apparatus according to an embodiment of the present invention, FIG. 2 is an enlarged partial sectional view showing a broken circle A in FIG. 1 and FIG. 3 is a motor apparatus of FIG. The perspective view which shows the connector member of these 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) for raising and lowering a window glass. . The motor device 10 is formed as a small-sized motor with a reduction mechanism capable of large output, and is installed in a narrow space (not shown) formed in a door of a 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) to be unitized. .

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

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

  A commutator 27 is fixed at a substantially intermediate portion along the axial direction of the armature shaft 26 and at a position 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 (two in the figure) held by the brush holder 25 come in sliding contact with the outer periphery of the commutator 27, and each brush 28 is directed by the spring member 29 toward the commutator 27 at a predetermined pressure. In elastic contact. As a result, a rotational force (electromagnetic force) is generated in the armature 24 by supplying a drive current to each brush 28 from a controller (not shown), and thus the armature shaft 26 is rotated at a predetermined rotational speed and rotational torque. ing.

  A sensor magnet 30 is fixed at a substantially intermediate portion along the axial direction of the armature shaft 26 and on the opposite side of the commutator 27 from the armature 24 side. 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 integrally rotate with the armature shaft 26. Therefore, with the rotation of the armature shaft 26, the state of the magnetic flux lines for the rotation sensor 70 disposed radially outward of the sensor magnet 30 changes. (See Figure 6).

  A worm gear 31 is provided on the other axial end side of the sensor magnet 30 of the armature shaft 26 in the axial direction. The worm gear 31 is formed in a substantially cylindrical shape, and is fixed to the armature shaft 26 by press-fitting. The tooth portion 42 a of the worm wheel 42 rotatably provided in the gear case 41 is engaged with the worm gear 31. 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 reduction mechanism SD.

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

  As shown in FIG. 2, the brush holder 25 is formed in a predetermined shape by injection molding of a resin material such as plastic, and includes a holder main body 25a and a bearing holding cylinder 25b. The holder body 25a movably holds the plurality of brushes 28 and is mounted to the opening 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 drawing).

  A second radial bearing 34 rotatably supporting a substantially middle portion along the axial direction of the armature shaft 26 is attached to the tip end portion of the bearing holding barrel 25b. That is, the armature shaft 26 penetrates inside the bearing holding barrel 25b. Further, the sensor magnet 30 fixed to the armature shaft 26 is disposed inside the bearing holding barrel 25b, and is configured to rotate with the armature shaft 26 inside the bearing holding barrel 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 abrasion powder of each brush 28 on the sensor magnet 30 side is the rotation sensor 70 or the rotation sensor 70 is not attached to the sensor substrate 60 to be mounted. As a result, the decrease in the detection performance of the rotation sensor 70 can be suppressed for a long time.

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

  Inside the gear case 41, a worm gear accommodating portion 41a extending along the axial direction of the armature shaft 26, and a worm wheel accommodating portion 41b disposed in proximity to the worm gear accommodating portion 41a are formed. A worm gear 31 and a worm wheel 42 having a tooth portion 42a meshing with the worm gear 31 at its outer peripheral portion are rotatably accommodated in the respective housing portions 41a and 41b. Here, the worm gear 31 is formed in a helical shape, and the tooth portion 42 a is inclined at a gentle inclination angle in the axial direction of the worm wheel 42. Thus, 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 be able to transmit power to a window regulator (not shown). That is, the rotation of the armature shaft 26 is decelerated by the reduction mechanism SD to be increased in torque, and output from the output shaft 42 b to the window regulator.

  A third radial bearing 43 and a second thrust bearing 44 are provided on the side (left side in the drawing) opposite to the motor case 21 side along the axial direction of the armature shaft 26 of the worm gear accommodating 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.

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

  In this manner, one axial end of the armature shaft 26 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 the second radial bearing 34. It is rotatably supported, and the other axial end of the armature shaft 26 is rotatably supported by the third radial bearing 43 and the 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 41 c is disposed in the vicinity of the brush holder 25 and on the opposite side to the worm wheel housing 41 b 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, which is separate from the gear case 41, is inserted and fixed in the connector member mounting hole 41c. There is.

  Here, to describe the extension direction of the connector member mounting hole 41c 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 (depth direction in the drawing), The extending direction of the connector member mounting hole 41c is a Y-axis direction which is perpendicular to both the X-axis direction and the Z-axis direction. The X-axis direction and the Y-axis direction indicate the width direction of the motor device 10 in the vertical and horizontal directions, 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 25c (one in the drawing) exposed from the brush holder 25 are exposed in the conductive member connection hole 41e continuing to the inside of the connector member mounting hole 41c. . Each driving conductive member 25c is formed in a rod shape of brass or the like excellent in conductivity, and one end side of each driving conductive member 25c is electrically connected to each brush 28, respectively. The other end of each driving conductive member 25 c is electrically connected to one end of a pair of power terminals 53 provided in the connector member 50.

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

  As shown in FIG. 1, the gear case 41 is provided with three fixing portions 41 d. The fixing portions 41 d are arranged at predetermined intervals (approximately 120 degrees apart) around the gear case 41 so as to surround the output shaft 42 b. Further, fixing bolts (not shown) for fixing the motor device 10 in the door of the vehicle are attached to the respective fixing portions 41 d. As described above, the motor device 10 can be supported in a well-balanced manner in a narrow door by providing the fixing portions 41 d at predetermined intervals so as to surround the output shaft 42 b. It is possible to effectively prevent the motor device 10 from fluttering in the door even if it is caught.

  As shown in FIGS. 1 and 3, the connector member 50 is formed in a substantially L-shape by injection molding of a resin material such as plastic, and includes a connector connection portion 51 and an insertion portion 52. An external connector CN (see FIG. 1) on the vehicle side is connected to the connector connection 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, or the like (neither is shown) mounted on the vehicle.

  Inside the connector connection portion 51 and the insertion portion 52, a pair of power supply terminals 53 and four signal terminals 54 are inserted (embedded). Each of the power supply terminals 53 and each of the signal terminals 54 is formed in a substantially L-shape along the shape of the connector member 50 of brass or the like excellent in conductivity. Further, each power supply terminal 53 is thicker than each signal terminal 54 because a larger current flows to each power supply terminal 53 than to 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, and a slit in which the other end side of each drive conductive member 25c (see FIG. 2) is inserted in the exposed portion 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 supply terminal 53 is exposed to the inside of the connector connection portion 51, whereby it becomes electrically connected to each power supply 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 to the inside of the connector connection portion 51 in the same manner as 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 mounted 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 in a state where the connector member 50 is mounted on the gear case 41 (see FIG. 1). This prevents rainwater, dust, and the like from entering the connector member mounting hole 41c from the outside of the gear case 41.

  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 of the sensor substrate 60 is fixed to the insertion portion 52, whereby the short sides 62 face each other along the Y-axis direction, and the long sides 61 face each other along the Z-axis direction. ing.

  And 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. It is done. That is, as shown in FIGS. 1 and 2, the sensor substrate 60 is directed radially outward of the armature shaft 26 with the connector member 50 mounted on the gear case 41 and centered on the armature shaft 26. It is 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 using the drawings.

  FIGS. 4A and 4B are explanatory views for explaining the arrangement 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 the bearing SP functioning as a partition wall is held in the gap SP The cylinder 25b is disposed. Here, the dimension of the gap SP is set to a dimension satisfying the following three conditions. That is, the rotation sensor 70 is placed as close as possible to the sensor magnet 30 to obtain sufficient detection performance, and the sensor magnet 30 does not contact the bearing holding cylinder 25b when the sensor magnet 30 rotates, and the insertion portion 52 is attached to the connector member When inserted into the hole 41c, the sensor substrate 60 and the bearing holding cylinder 25b do not come in contact with each other.

  As shown in FIG. 4A, a thickness dimension t1 of the sensor substrate 60 including the rotation sensor 70 along the axial direction of the armature shaft 26 is a thickness along the axial direction (X-axis direction) of the armature shaft 26 of the sensor magnet 30. The dimension is set to t2 or less. That is, when viewed from the visual point LP on the opposite side of the sensor magnet 30, the sensor substrate 60 including the rotation sensor 70 is within the range of the axial dimension (= t2) of the sensor magnet 30 (dotted in FIG. The rotation sensor 70 can be accommodated in the range, and 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 drawing) Will be placed.

  As a result, 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, and realize downsizing of the motor device 10. There is.

  Also, 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 the thickness dimension w 2 or less along the 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 (the shaded area in the figure) when viewed from the visual point LP on the opposite side across the sensor magnet 30. The rotation sensor 70 is arranged within the range of the diameter dimension (= w2) of the sensor magnet 30 (within the shaded range in the figure) when viewed from the visual point LP. Be done.

  As a result, 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. Is realized.

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

  FIG. 5 is an explanatory view 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 a detection state of magnetic flux components by the rotation sensor at each position. FIG. 7 shows an explanatory view for explaining a detection signal of a magnetic flux component by the rotation sensor and an 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 pole (S pole / N pole) of the sensor magnet 30 facing the rotation sensor 70, that is, the direction of the magnetic flux lines and the changes. . Thus, the rotation sensor 70 can detect the rotational state of the armature shaft 26 (see FIG. 4), that is, the rotational direction and rotational speed of the armature shaft 26. Specifically, the rotation sensor 70 is provided with a magnetoresistive element (MR element) as a sensor element, and is further a GMR sensor to which a giant magnetoresistive effect (Giant Magneto Resistance Effect) is applied.

  Rotation sensor 70 has a Y-axis direction element (first MR element) 71 whose electric 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. The waveform conversion circuit 73 receives 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 of the input sine wave signals (magnetic flux component in the Y-axis direction / magnetic flux component in the Z-axis direction) into rectangular wave signals and outputs them.

  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), the rotation sensor 70 Magnetic flux lines pass along only the substantially Z-axis direction. Therefore, in this state, the Z-axis direction magnetic flux component, that is, the strength H of the magnetic field along the Z-axis direction is maximized, and the output of the Z-axis direction element 72 is maximized. On the other hand, the Y-axis direction magnetic flux component, that is, the strength H of the magnetic field 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” shown by the broken line arrow in FIG. 6 is decomposed, it becomes “Y axis direction magnetic flux component” of the solid arrow and “Z axis direction magnetic flux component” of the white arrow.

  On the contrary to the above, when the sensor magnet 30 is at the position of "90 °" with respect to the rotation sensor 70, the magnetic flux lines pass through the rotation sensor 70 along substantially only the Y-axis direction. Furthermore, the direction of the magnetic flux lines is directed to the S pole of the sensor magnet 30. Therefore, in this state, the Y-axis direction magnetic flux component, that is, the strength H of the magnetic field along the Y-axis direction is maximum on the negative side, and the output of the Y-axis direction element 71 is maximum on the negative side. On the other hand, the Z-axis direction magnetic flux component, that is, the strength H of the magnetic field 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 the position of “−90 °” with respect to the rotation sensor 70, the magnetic flux lines pass along the substantially Y-axis direction in the rotation sensor 70, and further, the magnetic flux lines The direction of is opposite to that of the above "90.degree.". Therefore, in this state, the Y-axis direction magnetic flux component, that is, the strength H of the magnetic field along the Y-axis direction is maximum on the positive side, and the output of the Y-axis direction element 71 is maximum on the positive side. On the other hand, the Z-axis direction magnetic flux component, that is, the strength H of the magnetic field along the Z-axis direction is minimized, and the output of the Z-axis direction element 72 is minimized.

  Thus, as shown in the upper part of FIG. 6, 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 / dotted chain line) having a phase difference of 90 °. Each is to be output. Thereafter, these sine wave signals are input to the waveform conversion circuit 73, and as shown in the lower part of FIG. 6, the two types of rectangular wave signals (OUT1 / OUT2) having a phase difference of 90.degree. Is generated, and the generated two types of rectangular wave signals are respectively output.

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

  Thus, 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 a vehicle. ing. Then, the controller monitors the rising timing and falling timing of each rectangular wave signal to grasp the rotation direction and rotation speed of the sensor magnet 30, that is, the armature shaft 26, and controls the motor device 10 based on this. It is supposed to

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

  FIG. 8 is an explanatory view for explaining an assembling procedure of the motor device of FIG.

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

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

  Here, since the seal member 55 is fitted in 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 In order to do so, both may be fixed by a fastening screw (not shown).

  Next, the worm wheel 42 is housed inside the worm wheel housing 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 sealed by a gear cover (not shown). Thus, the motor device 10 is completed. However, the worm wheel 42 may be accommodated inside the worm wheel accommodating portion 41 b before the connector member 50 is inserted into and fixed to the gear case 41.

  As described above in detail, according to the motor device 10 according to the present embodiment, the rotation sensor 70 for detecting the rotation state of the armature shaft 26 is provided outside the sensor magnet 30 via the gap SP in the radial direction. A sensor substrate 60 is provided to extend radially outward 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 in the prior art.

  Therefore, it is possible to reduce the size and weight of the motor device 10 further by reducing the thickness dimension of the motor device 10 along the direction (Z-axis direction) intersecting the direction in which the sensor substrate 60 extends.

  Further, since the sensor substrate 60 can be compacted as compared with the conventional case, the ratio of the sensor substrate 60 to the gear case 41 can be reduced, and the freedom of arrangement of the fixing portion 41 d to the gear case 41 can be improved. Therefore, it is possible to improve the layout of the motor device 10 on the mounting object.

  It goes without saying that the present invention is not limited to the above embodiment, and various changes can be made without departing from the scope of the invention. For example, although in the above embodiment, one GMR sensor having two MR elements responsive to magnetic flux lines formed by the sensor magnet 30 is adopted as the rotation sensor, the present invention is not limited to this. Alternatively, two inexpensive MR sensors having one MR element may be employed. Furthermore, other magnetic sensors (Hall IC etc.) can also be adopted.

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

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 (rotational 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 housing portion 41b Worm wheel housing portion 41c Connector member mounting hole 41d Fixing portion 41e Conductive member connecting hole 42 Worm wheel 42a Tooth portion 42b Output shaft 43 Third radial bearing 44 Second thrust bearing 45 Rubber bush 50 Connector member 51 Connector connection Part 52 Insertion part 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 Speed reduction mechanism SL slit SP clearance

Claims (5)

Motor part,
A gear portion having a connector member to which an external connector is connected;
A motor device provided with
The motor unit is
A tubular motor case,
A plurality of magnets fixed to the inner wall of the motor case;
An armature housed in the motor case and wound with a coil;
An axis of rotation fixed at the center of rotation of the armature;
A sensor magnet which is fixed to the rotation axis and in which a plurality of magnetic poles of N pole and S pole are alternately provided along the rotation direction of the rotation axis;
A commutator fixed to the rotating shaft,
A plurality of brushes in sliding contact with the commutator;
A brush holder that holds the plurality of brushes and has a drive conductive member electrically connected to each of the plurality of brushes, and is mounted to the opening of the motor case;
Equipped with
The gear portion is
A worm gear fixed to the rotating shaft;
A worm wheel engaged with the worm gear;
A worm gear accommodating portion formed along an axial direction of the rotating shaft, the worm gear accommodating portion rotatably accommodated, and a worm wheel accommodating provided continuously to the worm gear accommodating portion, the worm wheel rotatably accommodated And a connector member mounting hole in which the connector member is inserted and fixed, and a conductive member connection hole which is continued to the inside of the connector member mounting hole and from which the driving conductive member is projected, and is coupled to the motor case Gear case, and
Equipped with
The connector member is
It is formed in a substantially L-shape by a resin material,
Power terminal,
Signal terminal,
A sensor substrate having a magnetic sensor disposed to face the sensor magnet and to which the signal terminal is electrically connected and fixed;
Equipped with
The connector member is inserted and fixed in the connector member mounting hole,
The power supply terminal and the signal terminal are formed in a substantially L shape.
The power supply terminal is formed with a slit at its tip end into which the drive conductive member is inserted, the drive conductive member is inserted into the slit, and the power supply terminal and the drive conductive member are electrically connected. Connected,
The power supply terminal and the signal terminal inserted into the conductive member connection hole are disposed such that the signal terminal is closer to the brush than the power supply terminal.
Motor device. In the motor device according to claim 1,
The sensor substrate includes a pair of long sides and a pair of short sides, and is formed in a substantially rectangular shape.
The pair of short sides are disposed to face each other in a direction orthogonal to the axial direction of the rotation axis.
Motor device. In the motor device according to claim 2,
One end of the signal terminal is connected to one short side of the sensor substrate,
The magnetic sensor is provided on the other short side of the sensor substrate.
Motor device. The motor device according to any one of claims 1 to 3.
The power terminal is formed wider than the signal terminal.
Motor device. The motor device according to any one of claims 1 to 4.
The sensor substrate is mounted with a rotation sensor that detects a change in the magnetic flux component of the magnetic pole caused by the rotation of the sensor magnet and detects the rotation state of the rotation shaft.
The sensor substrate is extended radially outward of the rotation axis around the rotation axis,
The rotation sensor includes a first magnetoresistance element whose electric resistance value changes in accordance with the magnitude of the magnetic flux component of the magnetic pole along the extending direction of the sensor substrate, and the direction orthogonal to the extending direction of the sensor substrate And a second magnetoresistance element whose electric resistance value changes in accordance with the magnitude of the magnetic flux component of the magnetic pole along the magnetic pole.
The largest surface of the plurality of surfaces forming the rotation sensor is provided to face the sensor substrate,
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 pole in which the electric resistance value of the first magnetoresistance element and the electric resistance value of the second magnetoresistance element are directed radially outward of the sensor magnet and in the circumferential direction of the sensor magnet as the rotation shaft rotates. Are respectively changed by the change of the magnetic flux component of
Motor device.

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