• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    wiper motor on a wiper motor including a motor unit having a rotation axis, and a gear unit having a speed reduction mechanism to reduce and output as the speed reduced speed, a first speed reduction gear forming a speed reduction mechanism is provided on one end side of an axis of rotation, a sensor magnet is attached to the other end of the axis of rotation, a control plate is provided in order to face the other end side of the axis of rotation from the axial direction of the axis of rotation, an mr sensor for detecting a rotational state of the axis of rotation is provided for a front portion of the control plate for the sensor magnet, and end portions coil coils configured to generate an electromagnetic force to rotate the axis of rotation based on the drive current supply of the control board are electrically connected control board.
    公开号:BR102012000232B1
    申请号:R102012000232-9
    申请日:2012-01-05
    公开日:2020-09-15
    发明作者:Toshiyuki Amagasa
    申请人:Mitsuba Corporation；
    IPC主号:
    专利说明:

    CROSS REFERENCE TO RELATED REQUEST
    The present application claims priority of JP Patent Application No. 2011-002005 filed on January 7, 2011, the content of which is thus incorporated by reference into that application. TECHNICAL FIELD OF THE INVENTION
    The present invention relates to a wiper motor including a motor unit having a rotation axis, and a gear unit having a speed reduction mechanism to reduce the rotation speed of a rotation axis and produce the reduced rotation in speed. BACKGROUND OF THE INVENTION
    Conventionally, an engine having a speed reduction mechanism (hereinafter simply referred to as “engine with speed reduction mechanism”) is used as a source for driving a wiper and the like to be mounted on a vehicle. The engine with speed reduction mechanism is designed to be a high power drive source of small size considering the mounting capacity in the vehicle. The engine with speed reduction mechanism includes a motor unit having a rotation axis, and a gear unit having a speed reduction mechanism (such as worm and worm gear), and it is designed so that its torque is increased by the speed reduction mechanism reducing rotation of the rotation axis and a rotational force is produced to the outside from an output axis provided to the speed reduction mechanism.
    Like a motor with a speed reduction mechanism that is used as a source of drive for a wiper device, a motor provided with a control plate to control the rotational direction of an axis of rotation and the number of revolutions is known. As described above, an engine with a speed reduction mechanism provided with the control plate is known, for example, an engine with a speed reduction mechanism described in Patent Document 1 (Publication of unexamined patent application JP No. 2010 -093977, Figure 3).
    The engine with speed reduction mechanism described in patent document 1 includes a motor unit having a rotation axis, and a speed reduction unit having a speed reduction mechanism formed of worm gear and the gear wheel. worm. The speed reduction unit includes a gear housing having a main body unit and a cover, the speed reduction mechanism is rotationally accommodated in the gear housing. A circuit board (control board) assembled with a plurality of circuit elements (magnetic sensor and the like) is accommodated in the gear housing, and arranged to cover the speed reduction mechanism in the axial direction of an output shaft .
    And, the control circuit provided to the outside is configured to recognize a rotational state of the rotation axis and the like, based on a detection signal from the magnetic sensor and the like, and to control the rotational direction (positive rotation or negative rotation) and the rotational speed of the axis of rotation. SUMMARY OF THE INVENTION
    However, according to the engine with speed reduction mechanism described in patent document 1, a circuit board assembled with a plurality of circuit elements is accommodated in the gear housing and arranged in the vicinity of a speed reduction mechanism to cover the speed reduction mechanism. Thus, this engine encounters such a problem that the dust generated by friction of a gear portion between the worm and the worm gearwheel that form the speed reduction mechanism, and grease and the like applied to the gear portion. gear are easily fixed to the circuit board by the rotational drive of the motor with speed reduction mechanism.
    When foreign matter such as friction-generated dust and grease is attached to the circuit board, the foreign matter acts as a heat insulating material to reduce heat dissipation from the circuit board and ends up causing the irregular functioning of each circuit element and lowering the detection accuracy of the magnetic sensor and the like. However, it is difficult to control the axis of rotation with high precision at an earlier stage, and maintenance and inspection is often necessary.
    An object of the present invention is to protect a circuit board from foreign matter such as friction-generated dust, grease and the like, and to provide a cleaner motor capable of controlling a rotating axis with high precision over a long period of time.
    A wiper motor according to the present invention includes a motor unit having a rotation axis, and a gear unit having a speed reduction mechanism for reducing the rotation speed of the rotation axis and producing the speed reduced rotation. , the wiper motor comprises: a first speed reduction gear provided on one end side of the axis of rotation and forming the speed reduction mechanism; a second speed reduction gear engaged with the first speed reduction gear to form the speed reduction mechanism and having an output shaft at a rotational center thereof; a sensor magnet attached to the other end of the axis of rotation; a control plate facing the other end of the axis of rotation in the axial direction of the axis of rotation; a rotation sensor provided with a portion facing the sensor magnet of the control board and detecting a rotational state of the axis of rotation; and a coil having an end side electrically connected to the control board and generating the electromagnetic force to rotate the axis of rotation by supplying control current to the control board.
    In the wiper motor according to the present invention, a magnet is mounted on the axis of rotation and the coil is wound inside a stator, and the axis of rotation is rotationally provided inside the stator under a non-contact state between the magnet and the coil.
    In the wiper motor according to the present invention, the control board is accommodated in a plate box having a connector connection portion to which an external connector is connected, and the plate box is mounted on an end portion of the motor housing that forms the motor unit.
    In the wiper motor according to the present invention, the rotation sensor is an MR sensor having a resistance value which is changed in response to the change in a magnetic field due to the rotation of the sensor magnet.
    According to the cleaner motor of the present invention, a first speed reduction gear forming a speed reduction mechanism is provided on one end side of a rotation axis, a sensor magnet is attached to the other end side of the axis of rotation, a control plate is provided so as to face the other end of the axis of rotation in the axial direction of the axis of rotation, a rotation sensor to detect a rotational state of the axis of rotation is provided for a front portion of the control board for the sensor magnet, and an end side of a coil configured to generate an electromagnetic force to rotate the axis of rotation based on the control current driving current is electrically connected to the board of control. In this way, the speed reduction mechanism and the control board can be provided on one end and the other end of the rotation axis respectively so that they are kept apart, and it is difficult to allow foreign materials such as as dust generated by friction, grease and the like reach the control board. Thus, it is possible to reduce the malfunction of each circuit element and degradation of detection accuracy of the magnetic sensor and the like by reducing the heat dissipation deterioration of the control board, and it is possible to reduce maintenance and inspection compared to and control a rotating axis with high precision over a long period of time.
    According to the cleaner motor of the present invention, once the magnet is mounted on the axis of rotation, the coil is wound inside the stator, and the axis of rotation is rotationally provided inside the stator while taking a state where the magnet is prevented from coming into contact with each of the coils, the wiper motor can be formed by a brushless motor. Consequently, because dust is not generated by brush friction, it is still possible to suppress foreign matter fixing to the control board.
    According to the cleaner motor of the present invention, since the control board is accommodated in a board box having a connector connection portion to which an external connector is connected, and the board box is mounted on the end of the motor box forming a motor unit, it is possible to accommodate the control plate in the plate box in advance. However, a variety of different specification control boards are accommodated in a common board box, and any of these control boards is arbitrarily selected according to the required specifications and thus the cleaner engine of different specifications can be easily built.
    According to the cleaner motor of the present invention, since the rotation sensor is an MR sensor having a resistance value which is changed in response to the change in a magnetic field due to the rotation of the sensor magnet, it is possible to provide the wiper motor without moving units such as switching components and the like. Thus, it is possible to increase the reliability of the wiper motor and control the axis of rotation with high precision over a long period of time. BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is a view explaining a wiper device provided with a wiper motor according to the present invention;
    Figure 2 is an enlarged perspective view of the wiper motor shown in Figure 1;
    Figure 3 is a cross-sectional view of the cleaner motor shown in Figure 2 along an axis of rotation and an output axis;
    Figure 4 is an exploded perspective view explaining an internal structure of a motor unit shown in Figure 3;
    Figure 5 is a bottom perspective view of an engine box in Figure 3;
    Figure 6 is a perspective view of a plate box in Figure 3 seen from its opening portion side; and
    Figure 7 is a cross-sectional view of the wiper motor according to the second embodiment corresponding to Figure 3. DESCRIPTION OF THE PREFERRED EMBODIMENTS
    In the following, a cleaner motor according to the first embodiment of the present invention will be described in detail with reference to the drawings.
    Figure 1 is a view explaining a wiper device provided with a wiper motor according to the present invention, Figure 2 is an enlarged perspective view of the wiper motor shown in Figure 1, Figure 3 is a cross-sectional view of the motor of wiper shown in Figure 2 along an axis of rotation and an output shaft, Figure 4 is an exploded perspective view explaining an internal structure of a motor unit shown in Figure 3, Figure 5 is a bottom perspective view of a motor housing in Figure 3, and Figure 6 is a perspective view of a plate housing in Figure 3 seen from its opening portion side.
    As shown in Figure 1, a front glass 11 as a window shield is provided on the front side of a vehicle 10 such as an automotive vehicle, and a cleaner device 12 for cleaning rainwater, dust and the like on the front glass 11 is mounted on a front end portion of the front window 11 on the vehicle 10. The wiper device 12 includes a pair of wiper members 13 provided on a driver's seat side and a front passenger seat side, and a wiper motor (wiper motor) 14. Wiper motor 14 is connected to a base end side of each wiper member 13 via a connecting mechanism 15, and configured to swing and drive each wiper blade 13a provided next to tip end of each wiper member 13 on the front glass 11.
    The wiper motor 14 is a positive and negative rotation wiper motor (reversible wiper motor) that alternatively performs positive and negative rotations based on a predetermined control logic. Thus, the connecting mechanism 15 oscillates in the direction of an arrow S in the drawing by repetitive positive and negative rotations of the wiper motor 14 as shown by an arrow R in the drawing. Each wiper blade 13a performs a reciprocal cleaning action on each cleaning strip 11a shown in Figure 1. In this way, it is possible to clean rain water, 5 dust and the like fixed on the front glass 11.
    As shown in Figures 2 to 6, the wiper motor 14 is a motor with a speed reduction mechanism that is provided with a DS1 speed reduction mechanism, and includes a motor unit 20, a gear unit 30, and a controller unit 40. Motor unit 10 and gear unit 30 are connected to each other by a plurality of SC fixing screws via a connecting member 50, and gear unit 30 and controller unit 40 are connected by a CS connection mechanism.
    The motor unit 20 includes a motor housing 21 which is formed of a steel plate in a lower cylindrical shape by a deep drawing work (press work) and the like. A bottom portion 21a of the motor box 21 is provided with a through hole 21b through which the other end side (right side in Figure 3) of a axis of rotation 22 penetrates. A bearing support portion 20 21c is integrally provided inside the motor box 21 in the vicinity of the through hole 21b. The bearing support portion 21c maintains a first radial bearing 23 to smoothly rotate the axis of rotation 22.
    As shown in Figure 5, a plurality of concave engagement portions 21d are provided on an outer circumferential side of the motor housing 21 and arranged along a circumferential direction of the motor housing 21. A total of four concave engagement portions 21 d (only two pieces in Figure 5) are provided along the circumference of the motor box 21 at regular intervals (at 90 degree intervals), and concave outwards towards its inner portion from the outside in the radial direction of the box motor 21. The concave engagement portions 21d are engaged with respective engagement claw portions 41a (see Figure 6) that are integrally provided with a plate box 41 to correspond to the respective concave engagement portions 21 d. Here, each concave coupling portion 21d and each coupling claw portion 41a constitute a CS connection mechanism, thereby securely securing the plate box 41 to the motor box 21 with a one-touch operation leading to the concave portions of engagement 21d to be engaged with the respective engagement claw portions 41a.
    An annular flange portion projecting radially outward 21e is integrally provided with an opening side (left side in Figure 3) of the motor housing 21. Since the flange portion 21e abuts a first flange portion 50a provided to the connection member 50, it is possible to connect both flange portions to each other without deviation by fixing them with each fixing screw SC with the predetermined fixing torque.
    An end side (left side in Figure 3) of the axis of rotation 22 is integrally provided with a serrated portion 22a composed of concavities and convexities extending in the axial direction. A first speed reduction gear 35 that forms the speed reduction mechanism DS1 is attached to the serrated portion 22a, so that the first speed reduction gear 35 and the rotation axis 22 are solidly fixed together, and it is possible prevent first speed reduction gear 35 from going crazy.
    One end side of the rotation shaft 22 is rotationally supported by a second radial bearing 52 provided to the connecting member 50, and protrudes into the gear unit 30 through the second radial bearing 52.
    The other end side of the axis of rotation 22 is rotationally supported by the first radial bearing 23, and protrudes into the controller unit 40 through the first radial bearing 23 and the through hole 21b. A concave mounting portion 22b taken concave along the axial direction of the axis of rotation 22 is provided for one end face of the other end portion of the axis of rotation 22. A sensor magnet 24 formed in approximately one disc shape is fixed to the concave mounting portion 22b, magnetized as well as to have a plurality of polarities in such a way that poles "N" and "S" are alternatively arranged along their circumferential direction, and rotate along the axis of rotation 22.
    A magnet 25 formed in an approximately cylindrical shape is fixed in an outer circumferential and approximately central portion in the axial direction of the axis of rotation 22 so as to extend in the axial direction of the axis of rotation 22. The magnet 25 is rotated by the electromagnetic force of coils 27 provided to the outer circumferential side of magnet 25, also magnetized in such a way that poles “N” and “S” are alternatively arranged along their circumferential direction, and rotates along the axis of rotation 22.
    A stator 26 formed in an approximately cylindrical shape is fixed inside the motor housing 21 by pressure adjustment. A plurality of teeth (not shown) extending radially towards the center portion of the stator 26 are integrally provided radially within the stator 26, and the coils 27 are wound around the respective teeth by concentrated winding.
    The magnet 25 is provided inside the coils 27 through a predetermined space (air gap), so that the axis of rotation 22 is rotatable inside the stator 26 under a non-contact state where the magnet 25 is prevented from coming into contact contact with each of the coils 27. Here, the axis of rotation 22, the magnet 25, the stator 26, and the coils 27 form a brushless motor. Each coil 27 has phases U, V, and W, and three end portions of coil 27a provided at one end of each coil 27 are electrically connected to a control plate 42 which is accommodated in the plate box 41 by penetration of the portion bottom 21a of engine box 21, as shown in Figure 5.
    Each of the coils 27 of phases U, V, and W is supplied with drive current from the control board 42 at a predetermined time delay 10, so that electromagnetic force is generated around it. A rotational force is generated in the magnet 25 by the generation of the electromagnetic force, thus rotating the axis of rotation 22 with predetermined rotational torque, number of revolutions, and rotational direction. Incidentally, by switching the direction of the drive current to be fed to the 15 coils 27 on one side (phase U, phase V, and phase W in that order) to the other side (phase W, phase V, and phase U in that order), the rotation of the rotation axis 22 is switched from a positive rotation to a negative rotation.
    The gear unit 30 includes a gear housing 31 which is, for example, molded from molten aluminum material 20 so as to be formed into a lower cylindrical shape. The opening side (right side in Figure 3) of the gear box 31 faces the opening side of the motor box 21, and is integrally provided with a flange portion projecting radially outwardly 31a. Since the flange portion 31 a abuts on a second flange portion 51 a provided 25 to the connecting member 50, it is possible to connect the flange portions to each other without deviation by securing them with each SC fastening screw with torque predetermined fixing system.
    A bottom portion 31b of the gearbox 31 is integrally provided with a support cylinder 31c formed in an approximately cylindrical shape. An output shaft 32 parallel to the axis of rotation 22 is thus provided so as to penetrate the support cylinder 31c. A third radial bearing 33 is provided between the support cylinder 31c and the output shaft 32. The third radial bearing 33 has a function to allow the axis of rotation 22 to be smoothly rotated.
    The output shaft 32 is configured to be larger than the axis of rotation 22 in diameter, and the output shaft 32 has greater rigidity than the axis of rotation 22. Thus, the output increased in torque by the speed reduction mechanism DS1 can be stably produced abroad.
    An end side (left side in Figure 3) of the output shaft 32 is integrally provided with a first serrated portion 32a composed of concavities and convexities extending in the axial direction and a male screw portion 32b close to the first serrated portion 32a. The first serrated portion 32a is engaged with an end side of an outlet plate 15a (see Figure 1) that forms the connection mechanism 15. In addition, the male screw portion 32b is secured by a threaded connection to a fixing nut. (not shown) to fix the output plate 15a to the output shaft 32. In this way, the output plate 15a is firmly fixed to the output shaft 32 so as not to run crazy.
    An end side of the output shaft 32 is mounted with a stop ring 34, so that the stop ring 34 prevents the output shaft 32 from playing with the support cylinder 31c in the axial direction. In this way, it is possible to prevent the play of the connection mechanism 15 when the wiper motor 14 is rotationally driven, and it is possible to suppress the generation of abnormal noise from the connection mechanism 15 and irregular wear of moving portions of the connection mechanism 15, , a junction sphere portion (not shown) and the like.
    The other end side (right side in Figure 3) of the output shaft 32 is integrally provided with a second serrated portion 32c composed of concavities and convexities extending in the axial direction. A second speed reduction gear 36 forming the speed reduction mechanism DS1 engaging with the first speed reduction gear 35 is attached to the second serrated portion 32c. Since the second serrated portion 32c is attached to the center of rotation of the second speed reduction gear 36, it is possible to prevent the second speed reduction gear 36 from running crazy. Furthermore, the other end side of the output shaft 32 is rotationally supported by a fourth radial bearing 53 provided to the connecting member 50.
    The speed reduction mechanism DS1 which reduces the speed of rotation of the axis of rotation 22 and produces, as an output, a reduced speed in rotation outwards through the output axis 32 is rotationally accommodated in gearbox 31. The mechanism of rotation Speed reduction DS1 consists of the first speed reduction gear 35 attached to the serrated portion 22a of the pivot shaft 22, and the second speed reduction gear 36 attached to the second serrated portion 32c of the output shaft 32. The first speed reduction 35 is configured to be smaller in diameter than the second speed reduction gear 36. In this way, its torque is increased by reducing rotation of the rotation axis 22 with a predetermined speed reduction ratio and the output increased by torque is produced as an outward output from output shaft 32.
    Connecting member 50 is, for example, molded from melted aluminum material so as to be formed into a lower cylindrical shape. The opening side (right side in Figure 3) of the connecting member 50 is facing the opening side of the motor box 21 and a bottom portion side 51 (left side in Figure 3) of the connecting member 50 is facing to the opening side of the gear housing 31. In other words, the connecting member 50 is arranged between the motor housing 21 and the gear housing 5.
    The opening side of the connecting member 50 is integrally provided with the first flange portion 50a that abuts the flange portion 21 and the motor housing 21, and the bottom portion side 51 of the connecting member 50 is integrally provided with the second flange portion 51a which 10 abuts the flange portion 31 a of the gearbox 31. In this way, the connecting member 50 is solidly fixed between the motor box 21 and the gear box 31 through each fixing screw SC.
    The bottom portion 51 of the connecting member 50 is integrally provided with a first concave bearing fixing portion 51b taken 15 towards the gearbox 31 and a second concave bearing fixing portion 51c taken concave towards the gearbox motor 21.0 second radial bearing 52 rotationally supporting one end side of the rotation shaft 22 is fixed to the first concave bearing fixing portion 51b, and the fourth radial bearing 53 rotationally 20 supporting the other end side of the output shaft 32 is fixed to the second concave bearing fixing portion 51c. In this way, it is possible to maintain an optimum gear state between the first speed reduction gear 35 and the second speed reduction gear 36 that form the speed reduction mechanism DS1, while '25 smoothly rotating the axis of rotation 22 and the output shaft 32.
    Controller unit 40 is formed in a lower cylindrical shape by injection molding and the like of resin material such as plastic and includes plate box 41 mounted on the end portion of the motor box 21.0 opening side (left side in Figure 3) of the plate box 41 is directed towards a bottom portion 21a of the motor box 21 and the opening side of the plate box 41 is, as shown in Figure 6, provided with a plurality of engagement claw portions 41a. The tip end sides of the hitch claw portions 41a extend towards the engine box 21, and the tip end sides of the hitch claw portions 41a are engaged with the respective concave hitch portions 21 d provided on the outer circumferential side of the engine box 21. A total of four hitch claw portions 41a are provided along the circumferential direction of the plate box 41 at regular intervals (at 90 degree intervals) to correspond to the respective concave portions coupling 21 d.
    The control plate 42 is formed of resin material such as, for example, phenolic resin in an approximately disk shape, accommodated in the plate box 41, and mounted on a bottom portion 41b of the plate box 41. The plate of control 42 is provided to be in front of the other end of the axis of rotation 22 in the axial direction of the axis of rotation 22, and electrically connected to the coil end portions 27a provided on one end side of the coils 27.
    The control board 42 is assembled with six drive circuits (circuit elements) 42a to supply drive current to each coil 27 and an MR (magnetic sensor) sensor 42b as a rotation sensor to detect a rotational state of the sensor magnet 24. The drive circuits 42a are arranged along the circumferential direction of the control board 42 and configured to supply the drive current to the coils 27 of phases U, V, and W in that order or in reverse order on the basis of the control of a controller on board the vehicle (not shown).
    The MR 42b sensor is provided in a portion facing the sensor magnet 24 of the control board 42. The MR 42b sensor has a resistance value that is changed in response to the change in the magnetic field due to the rotation of the sensor magnet 24, and generates this change in the value of 5 resistance as a detection signal. The MR 42b sensor detects a rotational state (rotational speed, rotational position and the like) of the rotation axis 22 of the change in the resistance value, and sends the detection signal (resistance value) to the controller on board the vehicle.
    The control board 42 is provided with a plurality of connection terminals 42c (only two terminals are illustrated) each being made of metallic material such as brass which is excellent in electrical conductivity and formed in a plate format. One end of each connection terminal 42c is electrically connected towards the outer circumference of the control board 42, and the other end of each connection terminal 42c penetrates through the plate box 41, and extends in one direction orthogonal to the axial direction of the rotation axis 22.
    In the plate box 41, a hollow connector connection portion 41c is integrally provided with a portion corresponding to each connection terminal 42c, and the other end side of each connection terminal 42c is exposed within the connection portion of the 41c connector. As shown by an arrow mark M in Figure 2, an external OC connector provided on a vehicle side 10 is inserted into the connecting portion of connector 41c, thus electrically connecting the controller on board the vehicle to the control board 42.
    Then, an operation of the wiper motor 14 formed as described above will be described in detail with reference to the drawings.
    When a wiper switch (not shown) provided inside the vehicle is switched on, the drive current is fed to each coil 27 from the controller on board the vehicle through each drive circuit 42a of the control board 42. Then, the electromagnetic force is generated in each coil 27, thus relatively rotating the magnet 25 (axis of rotation 22) in relation to the stator 26 (each coil 27). And the rotation of the axis of rotation 22 is reduced by the speed reduction mechanism DS1 (the first speed reduction gear 35 and the second speed reduction gear 36) in order to obtain a high torque. A high torque rotating force is transmitted to the connection mechanism 15 through the output shaft 32, and each wiper member 13 performs a periodic oscillating movement. Detection (position detection) of a reverse position and a stop position of each wiper member 13 is performed by counting the change in resistance values on the basis of the MR 42b sensor detection signal.
    Here, a predetermined amount of grease to make both gears spin smoothly is applied to the gear portion between the first speed reduction gear 35 and the second speed reduction gear 36. In addition, dust is generated by friction between the first speed reduction gear 35 and the second speed reduction gear 36 due to the long-term use of the wiper motor 14. Thus, even if the friction-generated dust, grease and the like are spread on the gearbox gear 31 by operating the wiper motor 14, since the bottom portion 51 of the connecting member 50 and the bottom portion 21a of the motor housing 21 are arranged between the speed reduction mechanism DS1 and the control plate 42 in this embodiment, the bottom portions 51 and 21a constitute a barrier (separation wall). However, dust generated by friction, grease and the like is prevented from reaching control board 42, and it is possible to keep control board 42 in a clean state.
    As described above, in the wiper motor 14 according to a first embodiment, the first speed reduction gear 35 forming the speed reduction mechanism DS1 is provided at one end side of the rotation shaft 22, the magneto. sensor 24 is attached to the other end of the axis of rotation 22, the control plate 42 is provided to be in front of the other end of the axis of rotation 22 in the axial direction of the axis of rotation 22, and the sensor MR 42b to detect the rotational state of the axis of rotation 22 is provided for a portion of the control plate 42 to be in front of the sensor magnet 24, and the coil end portions 27a of the coils 27 generating the electromagnetic force to take the axis of rotation 22 to rotate feeding the drive current from the control board 42 are electrically connected to the control board 42.
    In this way, it is possible to arrange the speed reduction mechanism DS1 and the control board 42 on one end side and the other end side of the rotation axis 22 in order to keep them apart, so that foreign matter such as friction-generated dust, grease and the like can be made more difficult to reach the control board 42. Thus, it is possible to reduce the malfunction of each drive circuit 42a and the degradation of detection accuracy of the MR 42b sensor by suppressing deterioration of heat dissipation from the control board 42, and it is possible to reduce maintenance and inspection compared to conventional ones and to control a rotation axis with high precision over a long period of time.
    In addition, in the wiper motor 14 according to the first embodiment, since the magnet 25 is mounted on the axis of rotation 22, and the coils 27 are wound inside the stator 26, and the axis of rotation 22 is rotationally provided within the stator 26 in a non-contact state where the magnet 25 is prevented from coming into contact with each of the coils 27, the wiper motor 14 can be formed by a brushless motor. However, since dust is generated by brush friction, it is still possible to prevent foreign material from being fixed to the control plate 42.
    Furthermore, in the wiper motor 14 according to the first embodiment, since the control plate 42 is accommodated in the plate box 41 having the connecting portion of the connector 41c to be connected to an outer connector OC, and the plate box 41 is mounted on the end portion of the motor box 21 that forms the motor unit 20, it is possible to accommodate the control plate 42 in the plate box 41 in advance. However, it is possible to easily build the wiper motor 14 based on different specifications by selecting an optional control board from the various control boards 42 accommodated in the common board box 41 in advance based on required specifications.
    In addition, since the rotation sensor is an MR 42b sensor having a resistance value that is changed in response to the change in the magnetic field due to the rotation of the sensor magnet 24, it is possible to provide the wiper motor 14 according to a first embodiment without mobile units such as switching components and the like. Thus, it is possible to increase the reliability of the wiper motor 14 and to control the rotation axis 22 with high precision over a long period of time.
    Then, a cleaner motor according to a second embodiment of the present invention will be described in detail with reference to the drawings. In addition, portions having the same functions as those of the first embodiment described above are denoted by the same reference numbers as those of the first embodiment and their detailed descriptions are omitted here.
    Figure 7 is a cross-sectional view of a wiper motor according to a second embodiment, and corresponds to Figure 3.
    As shown in Figure 7, a wiper motor (wiper motor) 60 according to a second embodiment differs from wiper motor 14 (see Figure 3) according to a first embodiment in which the speed DS1 is changed in structure, the axis of rotation is changed in shape, gearbox 31 is changed in shape, and connection member 50 is omitted.
    The wiper motor 60 includes a motor unit 70 and a gear unit 80, and these are connected together by a plurality of SC fixing screws.
    The motor unit 70 includes an axis of rotation 71 that is longer than the axis of rotation 22 (see Figure 3) of the first embodiment. An end side of the rotating shaft 71 extends into the gear housing 81 forming the gear unit 80, and an end side of the rotating shaft 71 is integrally provided with a worm thread (first gear of speed reduction) 72 forming a DS2 speed reduction mechanism. In the gearbox 81, the worm thread 72 rotates with the rotation of the axis of rotation 71.
    Gear unit 80 includes gear box 81 formed in an approximately bathtub shape. A worm sprocket (the second speed reduction gear) 82 forming the DS2 speed reduction mechanism is engaged with worm thread 72 and rotationally accommodated in gear box 81, and the end side of the base of an output shaft 83 is fixed to the rotational center of the worm gear wheel 82.
    The tip end side of the output shaft 83 extends outwardly through a protrusion portion (not shown) integrally provided with a bottom portion 81a of gear box 81, and the tip end side of the shaft outlet 83 is attached to an end side of an outlet plate 15a shown in Figure 1. Thus, rotation of the rotation shaft 71 is reduced in speed by worm 72 and worm gear 82 , thus producing as a speed-reduced output to the outside of the output shaft 83.
    One side of the motor box 21 of the gear box 81 is integrally provided with a wall portion 84 which is penetrated by the axis of rotation 71, and the wall portion 84 is provided with a second radial bearing 85 to rotationally support a portion approximately center of rotation axis 71. In addition, in gearbox 81, a third radial bearing 86 for rotationally supporting an end side of rotation axis 71 is provided on the opposite side of motor housing 21.
    In this way, since both sides of the end and the approximately central portion of the axis of rotation 71 are rotationally supported by the first radial bearing 23, the second radial bearing 85, and the third radial bearing 86, when the wiper motor 60 is rotationally driven, it is possible to obtain a stable rotation without vibration. Although a reactive force (arrow mark in the drawing) of the worm gear wheel 82 acts on the axis of rotation 71 (worm thread 72), it is possible to suppress the set of the axis of rotation 71 in the axial direction by a screw of adjustment 87 provided in gearbox 81. Thus, it is possible to suppress the generation of abnormal noises from the wiper motor 60.
    In the wiper motor 60, the wall portion 84 of the gear box 81 and the bottom portion 21a of the motor box 21 are arranged between the speed reduction mechanism DS2 and the control plate 42, and the wall portion 84 and the bottom portion 21a constitute a barrier (separation wall). However, dust generated by friction, grease and the like is prevented from reaching control board 42, and it is possible to keep control board 42 in a clean state.
    Even on the wiper motor 60 according to the second embodiment formed as described above, it is possible to achieve the same effect as that of the first embodiment. Furthermore, in the wiper motor 60 according to a second embodiment, since the wiper motor having the conventional speed reduction mechanism DS2 composed of worm 72 and worm gear 82 does not include a control board to be accommodated in gearbox 81, it is possible to reduce the thickness along the axial direction of the output shaft 83 of gearbox 81. Consequently, wiper motor 60 can be made compact and the capacity of being mounted on board vehicle can be improved.
    It is to be understood that the present invention is not limited to each of the described embodiments, and various modifications and alternations can be made without departing from the scope of the present invention. For example, in each of the described embodiments, although the axis of rotation 22 (axis of rotation 71) is provided with the magnet 25, the coils 27 are provided inside the stator 26, and a brushless motor is shown as the drive source, the present invention is not limited to that configuration, and can be applied to a brushed motor in which a commutator and a coil are provided with a rotating shaft, and a magnet and brush are provided for a housing motor.
    Furthermore, in each of the described embodiments, although each coil end portion 27a on one end side of each coil 27 is directly and electrically connected to the control board 42, the present invention is not limited to that configuration, and each coil end portion 27a and control board 42 can be electrically connected to each other via a connector. In this case, when the motor box 21 is mounted on the plate box 41, each end portion of coil 27a and the control plate 42 can be electrically connected to each other with one-touch operation, making it possible to simplify the assembly process of that motor.
    Furthermore, in each of the described embodiments, although each of the wiper motors 14 and 60 shown as a motor is a source of driving the wiper device that cleans the front window 11 of the vehicle 10, the present invention is not limited to the embodiments described above, and the wiper motor can be used as a driving source for the rear wiper device of a vehicle such as an automobile and the wiper device of a rail vehicle and an aircraft.
    权利要求:
    Claims (4)
    [0001]
    1. Wiper motor including a motor unit having a rotation axis, and a gear unit having a speed reduction mechanism to reduce the rotation speed of the rotation axis and produce the reduced speed rotation as the output, the motor wiper characterized by the fact that it comprises: a first speed reduction gear provided on one end side of the axis of rotation and forming the speed reduction mechanism; a second speed reduction gear engaged with the first speed reduction gear to form the speed reduction mechanism and having an output shaft at a rotational center thereof; a sensor magnet attached to the other end of the axis of rotation; a control plate facing the other end of the axis of rotation from the axial direction of the axis of rotation; a rotation sensor provided in a portion facing the sensor magnet of the control board and detecting a rotational state of the rotation axis; and a coil having an end side electrically connected to the control board and generating the electromagnetic force to rotate the axis of rotation by supplying driving current from the control board.
    [0002]
    2. Wiper motor according to claim 1, characterized in that a magnet is mounted on the axis of rotation and the coil is wound inside a stator, and the axis of rotation is rotationally provided within the stator under a state without contact between the magnet and the coil.
    [0003]
    3. Wiper motor according to claim 1, characterized by the fact that the control board is accommodated in a plate box having a connector connection portion to which an external connector 5 is connected, and the plate box is mounted on an end portion of the engine housing that forms the engine unit.
    [0004]
    4. Wiper motor according to claim 1, characterized in that the rotation sensor is an MR sensor having a resistance value which is changed in response to the change in a magnetic field 10 due to the rotation of the sensor magnet.
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    同族专利:
    公开号 | 公开日
    KR20120080528A|2012-07-17|
    US20120176073A1|2012-07-12|
    JP2012147519A|2012-08-02|
    CN102594028A|2012-07-18|
    EP2475079A3|2017-04-26|
    US8659251B2|2014-02-25|
    RU2566591C2|2015-10-27|
    EP2475079B1|2019-02-27|
    CN102594028B|2016-05-18|
    EP3480925A1|2019-05-08|
    RU2011153171A|2013-07-10|
    EP3480925B1|2021-07-21|
    EP2475079A2|2012-07-11|
    BR102012000232A2|2013-07-16|
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    法律状态:
    2013-07-16| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-16| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2020-04-28| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-09-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 05/01/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011-002005|2011-01-07|
    JP2011002005A|JP2012147519A|2011-01-07|2011-01-07|Motor device|
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