JP2010193643A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a structure by which abrasion powder of a brush is prevented from adhering to a control substrate. <P>SOLUTION: A motor connection 24 mounted with a motor body, and a bottomed case part 21 opened in the direction orthogonal to an opening side of the motor connection 24 are provided at a gear case 20. Moreover, a brush holder housing chamber 26 to house a brush holder 27 is formed in the motor connection 24, and a substrate housing chamber 34b to house the control substrate 35 are formed in the case part 21.Furthermore, a first communication hole 41 and a second communication hole 44 communicating the brush holder housing chamber 26 with the inside of the case part 21 are provided at the gear case 20, a partition wall 46 having a substantially U-shaped cross section to partition between the first communication hole 41, and the second communication hole 44 and the substrate housing chamber 34b is provided in the case part 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor in which a control board for controlling rotation of a motor shaft is accommodated in a gear case.

  For example, a motor with a brush is used as a drive source for a wiper device or a power window device mounted on a vehicle. The motor with brush has a motor main body having a motor shaft and a gear case to which the motor main body is attached. In a motor with a brush, the motor shaft is driven to rotate by supplying a drive current to an armature fixed to the motor shaft.

  The gear case is provided with a motor connection part that opens to the motor body side, and the motor body is attached to the motor connection part. A brush holder housing chamber formed in the motor connection portion houses a brush holder including at least a pair of brushes for supplying power to the armature via a commutator. The gear case is provided with a bottomed case portion that opens in a direction orthogonal to the opening side of the motor connection portion. A speed reduction mechanism accommodation chamber formed in the case portion accommodates a speed reduction mechanism including a worm formed integrally with the motor shaft and a worm wheel meshing with the worm. The rotation of the motor shaft is decelerated and transmitted to the output shaft through the speed reduction mechanism, and the wiper device and the like are driven by the output shaft. A gear cover that closes the opening side of the case portion is attached to the gear case.

  By the way, as a motor with a brush, there is one in which a control board is accommodated in a case portion in order to simplify the electrical connection between a control board for controlling the rotational drive of a motor shaft and the brush (for example, Patent Document 1). However, when the control board is accommodated in the case portion in this way, there is a possibility that a problem may occur in the motor due to the foreign matter adhering to the control board. In view of this, for example, it has been proposed to provide a cover member in the case portion that divides the substrate storage chamber in which the control substrate is stored and the speed reduction mechanism storage chamber. This makes it possible to prevent the grease applied to the meshing portion of the speed reduction mechanism from adhering to the control board.

Special table 2003-531562 gazette

  However, the foreign matter that may adhere to the control board is not limited to the grease applied to the meshing portion of the speed reduction mechanism. As described in Patent Document 1, in a motor with a brush that accommodates a control board in a case portion, a power supply connector (brush device) mounted in a communication hole that communicates the brush holder housing chamber with the inside of the case portion. Thus, the control board and the brush are electrically connected. Therefore, the brush wear powder generated in the brush holder housing chamber when the motor is operating enters the substrate housing chamber through the gaps in the communication holes due to vibration during operation, etc., and the brush wear powder adheres to the control board and causes malfunction of the motor. May occur.

  An object of the present invention is to provide a structure that suppresses brush wear powder from adhering to a control substrate.

  The motor of the present invention includes a motor main body including a motor shaft, a gear case including a motor connecting portion to which the motor main body is attached and a bottomed case portion, a gear cover closing the opening side of the case portion, and the motor A brush holder housing chamber for housing a brush holder provided with a brush for supplying power to the motor body provided in the connecting portion, and a substrate housing for housing a control board provided in the case portion for controlling the rotational drive of the motor shaft. A communication hole communicating with the chamber, the brush holder housing chamber and the inside of the case portion, and disposed between the gear case and the gear cover provided in the case portion, between the communication hole and the substrate housing chamber. It has the partition wall which partitions off.

  In the motor according to the aspect of the invention, the partition wall includes a side wall portion and a facing wall portion connected to the side wall portion, and at least one of an end surface of the side wall portion and an end surface of the facing wall portion is the gear case. It extends toward an inner wall surface, and is formed so as to surround the communication hole by the side wall portion and the opposing wall portion.

  In the motor of the present invention, the communication hole is provided with a bearing fixing member that fixes a bearing that rotatably supports the motor shaft, and the partition wall is provided in proximity to the bearing fixing member. Features.

  The motor of the present invention is characterized in that the partition wall is formed integrally with the gear case or the gear cover.

  The motor according to the present invention is characterized in that the partition wall is formed separately from the gear case and the gear cover.

  The motor of the present invention is provided with a cover member for partitioning the substrate housing chamber and a speed reduction mechanism housing chamber that houses a speed reduction mechanism that decelerates and transmits the rotation of the motor shaft in the case portion, and is integrated with the cover member. And forming the partition wall.

  According to the present invention, since the partition wall for partitioning between the communication hole that connects the brush holder accommodation chamber and the inside of the case portion and the substrate accommodation chamber is provided in the case portion, the brush holder accommodation chamber is connected to the inside of the case portion via the communication hole. It is possible to suppress brush wear powder that has entered the substrate into the substrate housing chamber. Therefore, it is possible to prevent the brush wear powder from adhering to the control board and causing problems on the control board.

  According to the present invention, at least one of the end surface of the side wall portion and the end surface of the opposing wall portion extends toward the inner wall surface of the gear case, and is formed so as to surround the communication hole by the side wall portion and the opposing wall portion. The brush wear powder can be effectively prevented from entering the substrate housing chamber, and the partition wall can be installed in a small space. Therefore, the partition wall can be provided without increasing the size of the gear case.

  According to the present invention, since the bearing fixing member is mounted in the communication hole and the partition wall is disposed close to the bearing fixing member, the gap between the partition wall and the gear case is covered with the bearing fixing member. Become. Thereby, since the penetration path | route of the brush abrasion powder between a partition wall and a gear case is extended, it can further suppress that brush abrasion powder penetrate | invades into a board | substrate storage chamber.

It is a perspective view of the wiper motor which is one embodiment of the present invention. It is a disassembled perspective view of a wiper motor. It is sectional drawing which follows the AA line in FIG. It is a front view which shows a gear case from the motor main body side. It is a perspective view which expands and shows a part of wiper motor in the state where the gear cover was removed. It is sectional drawing which expands and shows a part of FIG. FIG. 6 is a plan view of the wiper motor shown in FIG. 5. It is a rear view which shows the back surface of a gear cover. It is sectional drawing which expands and shows a part of wiper motor which is other embodiment of this invention. It is sectional drawing which expands and shows a part of wiper motor which is other embodiment of this invention. It is sectional drawing which expands and shows a part of wiper motor which is other embodiment of this invention. It is a rear view which shows the back surface of the gear cover of the wiper motor shown in FIG.

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

  As shown in FIGS. 1 to 3, the wiper motor 10 is provided in a wiper device mounted on a vehicle such as an automobile, and drives a link mechanism (not shown) connected to a wiper arm. The wiper motor 10 is a motor with a speed reduction mechanism in which a motor main body 11 and a speed reduction mechanism that reduces the rotation of the motor main body 11 and transmits it to a link mechanism are combined into one unit. The wiper motor 10 has a motor main body 11 as a driving source and a gear portion 12 having a speed reduction mechanism.

  The motor body 11 is a DC motor with a brush, and a motor shaft 13 provided in the motor body 11 can rotate in the forward direction and the reverse direction. The motor body 11 has a yoke 14 formed by press-forming a thin steel plate or the like into a bottomed stepped cylinder. On the inner surface of the yoke 14, a plurality of permanent magnets 15 magnetized in the N-pole and S-pole toward the inside in the radial direction are fixed alternately in the rotational direction of the motor shaft 13.

  Inside the yoke 14 is accommodated an armature (armature) 16 that faces each permanent magnet 15 via a minute gap (air gap). The armature 16 has an armature core 16a having a plurality of slots in the rotation direction. In each slot, a plurality of armature coils 16b are mounted by winding a conductive wire. A motor shaft 13 is provided through the shaft center of the armature 16. The end of the motor shaft 13 on one end side in the axial direction (left side in FIG. 3) is rotatably supported by a bearing 17 fixed to the bottom wall of the yoke 14.

  A commutator 18 that rotates integrally with the armature 16 is fixed to the motor shaft 13 adjacent to the other axial end of the armature 16 (right side in FIG. 3). The commutator 18 includes a plurality of segment pieces that are arranged at equal intervals in the rotational direction while being insulated from each other. A coil end of the corresponding armature coil 16b is electrically connected to each segment piece.

  The motor body 11 is attached to a gear case (frame) 20 of the gear portion 12 on the opening side of the yoke 14. The gear case 20 formed by aluminum die casting includes a substantially rectangular bottomed case portion 21 that opens in a direction perpendicular to the axial direction of the motor shaft 13 (upward in FIG. 3). The gear case 20 is provided with a resin gear cover 22 formed in a substantially similar outer shape to the case portion 21 by a plurality of mounting screws 23, and the opening side of the case portion 21 is closed by the gear cover 22.

  The gear case 20 is integrally formed with a motor connection portion 24 to which the motor body 11 is attached at a side end portion of the case portion 21. As shown in FIG. 3, the motor connection portion 24 has a stepped cylindrical shape that opens in a direction orthogonal to the motor body 11 side (left side in FIG. 3), that is, the opening side of the case portion 21. The motor connection portion 24 is located on the motor main body 11 side and has a brush holder housing portion 24a formed in a substantially oval cross section. The motor connection portion 24 is formed to have a smaller diameter than the brush holder housing portion 24a. And a bearing support portion 24b having a substantially cylindrical shape protruding toward the portion 21 side (right side in FIG. 3). The motor main body 11 is fixed to the end surface on the opening side of the motor connection portion 24 by a plurality of fixing screws 25 with the other axial end of the motor shaft 13 protruding into the case portion 21 via the motor connection portion 24. ing.

  A brush holder accommodating chamber 26 is formed in the brush holder accommodating portion 24a into which the commutator 18 is inserted. The brush holder housing chamber 26 houses a resin brush holder 27 located around the commutator 18. The brush holder 27 includes a pair of brushes 27 a that are urged radially inward by a spring member and that are in sliding contact with the outer peripheral surface of the commutator 18. When a drive current is supplied to the armature coil 16b via the pair of brushes 27a and the commutator 18 made of a conductive material, an electromagnetic force is generated in the armature 16 so that the motor shaft 13 is rotationally driven.

  The other axial end of the motor shaft 13 projecting into the gear case 20 is rotatably supported by bearings 28 and 29 fixed in the gear case 20. A bearing 28 that supports a substantially central portion in the axial direction of the motor shaft 13 is mounted in a bearing support portion 24b. On the other hand, a bearing 29 that supports the other axial end of the motor shaft 13 is mounted in the case portion 21. A worm 13 a is integrally formed on the outer peripheral surface of the motor shaft 13 on the other end side in the axial direction, located between the bearings 28 and 29.

  A worm wheel 30 that meshes with the worm 13a is rotatably accommodated in the case portion 21 adjacent to the worm 13a. An output shaft 31 extending in a direction opposite to the opening side of the case portion 21 (downward in FIG. 3) is fixed to the shaft center of the worm wheel 30. The output shaft 31 that rotates integrally with the worm wheel 30 protrudes from the bottom wall of the case portion 21, and is connected to the link mechanism of the wiper device at the tip portion. As a result, the rotation of the motor shaft 13 is transmitted to the output shaft 31 at a reduced speed via a speed reduction mechanism (worm gear mechanism) composed of the worm 13a and the worm wheel 30, and the link mechanism is driven.

  As shown in FIG. 3, in the case portion 21, a resin that partitions a speed reduction mechanism accommodation chamber 34 a that accommodates the speed reduction mechanism and a substrate accommodation chamber 34 b that accommodates a control board 35 that controls the rotation drive of the motor shaft 13. The cover member 36 made of is attached. The speed reduction mechanism accommodation chamber 34 a is formed between the cover member 36 and the bottom wall of the case portion 21. On the other hand, the substrate housing chamber 34 b is formed between the cover member 36 and the gear cover 22. That is, the inside of the case portion 21 is partitioned on the upper and lower sides in FIG. 3 by the cover member 36 disposed at the substantially central portion in the opening direction of the case portion 21. The brush holder accommodation chamber 26 and the speed reduction mechanism accommodation chamber 34a are partitioned by the bearing 28, so that the brush wear powder generated in the brush holder accommodation chamber 26 when the motor is operated enters the speed reduction mechanism accommodation chamber 34a. Is prevented.

  The cover member 36 is disposed on the other end side in the axial direction of the motor shaft 13 relative to the bearing support portion 24b, and covers the other end side in the axial direction of the motor shaft 13 and the worm wheel 30 from the opening side of the case portion 21. It has become. The cover member 36 includes a bottom wall 36b formed with a through hole 36a through which the radial center portion of the worm wheel 30 is inserted, and a side wall 36c extending from the outer periphery of the bottom wall 36b to the opening side of the case portion 21. ing. The control board 35 is housed in the cover member 36 and is locked by a plurality of locking claws provided at the tip of the side wall 36c. The cover member 36 prevents the grease applied to the meshing portion between the worm 13 a and the worm wheel 30 from adhering to the control board 35.

  The control substrate 35 attached to the substrate housing chamber 34b side of the cover member 36 has a function as a so-called microcomputer in which a plurality of electronic components such as a CPU, a memory, and an FET are mounted on the substrate. In FIG. 3, illustration of electronic components mounted on the control board 35 is omitted.

  In order to detect the rotation of the motor shaft 13, a pair of hall sensors 37 are provided on the control board 35, and a sensor magnet 38 is fixed to the motor shaft 13 between the bearing 28 and the worm 13 a. The sensor magnet 38 is an annular multipolar magnetized magnet in which a plurality of magnetic poles are alternately magnetized in the circumferential direction. On the other hand, each hall sensor 37 is opposed to the sensor magnet 38 with a predetermined phase difference. As a result, when the motor shaft 13 rotates, a pulse signal having a period inversely proportional to the rotation number is output from each Hall sensor 37, and the control board 35 detects the rotation number of the motor shaft 13 from the period of the pulse signal. The control board 35 detects the rotation direction of the motor shaft 13 based on the order of appearance of the pulse signals from the hall sensors 37. These detection signals are used for controlling the rotational drive of the motor shaft 13 by the control board 35.

  4 is a front view showing the gear case from the motor body side, FIG. 5 is an enlarged perspective view showing a part of the wiper motor with the gear cover removed, and FIG. 6 is an enlarged view of a part of FIG. It is sectional drawing shown.

  As shown in FIG. 4, the motor connection portion 24 is formed with a substantially oval partition wall 24 c that connects the brush holder housing portion 24 a and the bearing support portion 24 b so as to extend in the radial direction of the motor shaft 13. The gear case 21 partitions the motor connection portion 24 and the case portion 21 by the partition wall 24c. Further, the partition wall 24c is positioned on the opening side (upper side in FIG. 4) of the case portion 21 with respect to the bearing support portion 24b, and passes through the partition wall 24c in the axial direction of the motor shaft 13 in a first series of substantially rectangular shapes. A hole 41 is formed. The brush holder housing chamber 26 communicates with the inside of the case portion 21 through the first series of holes 41.

  As shown in FIG. 5, in the first through-hole 41, a substantially rectangular parallelepiped power feeding part (power feeding connector) 27 b formed integrally with the brush holder 27 enters the case part 21 from the brush holder housing chamber 26 side. Protrusively provided. A conductive plate (not shown) that is electrically connected to the pair of brushes 27a is provided inside the power feeding portion 27b. As shown in FIG. 3, the power feeding portion 27 b is electrically connected to the control board 35 by a power feeding terminal 42 that is insert-molded in the gear cover 22. The control board 35 is connected to a wiper switch and a battery (not shown) via a connector 43 provided on the gear cover 22. Thereby, the control board 35 supplies a current to the motor main body 11 in accordance with a command signal from the wiper switch, and controls the rotational drive of the motor shaft 13.

  On the other hand, as shown in FIG. 6, a substantially rectangular second communication hole 44 extending in the radial direction of the motor shaft 13 is formed in the bearing support portion 24 b adjacent to the motor body 11 side of the bearing 28. . That is, the second communication hole 44 extends in the up-down direction in FIG. 6 and opens to the gear cover 22 side, and extends in the left-right direction in FIG. Through the second communication hole 44, the brush holder housing chamber 26 and the inside of the case portion 21 are communicated with each other. A bearing fixing member 45 for supporting the bearing 28 from one end side in the axial direction of the motor shaft 13 is mounted in the second communication hole 44. The bearing fixing member 45 includes a protruding portion 45 a that protrudes from the second communication hole 44 toward the opening side of the case portion 21.

  When the motor is operated, the gap between the first communication hole 41 and the second communication hole 44 as shown by arrows B and C in FIG. There is a risk of intrusion into the case portion 21 from the brush holder housing chamber 26 via the. In the wiper motor 10, it is possible to prevent the brush wear powder that has entered the case portion 21 through the gap between the first communication hole 41 and the second communication hole 44 from entering the substrate housing chamber 34 b and sticking to the control substrate 35. For this purpose, a partition wall 46 is provided in the case portion 21.

  Next, the shape of the partition wall 46 will be described in detail. 7 is a plan view of the wiper motor shown in FIG. 5, and FIG. 8 is a rear view showing the back surface of the gear cover.

  The partition wall 46 is formed separately from the gear case 20, the gear cover 22, and the cover member 36 by a resin material. As shown in FIGS. 5 and 7, the partition wall 46 is opposed to the partition wall 24c and extends in a direction orthogonal to the axial direction of the motor shaft 13 (left and right direction in FIG. 7), and the opposing wall portion 46a. And a pair of side wall portions 46b extending to the motor main body 11 side (upper side in FIG. 7).

  The facing wall portion 46a is provided close to the protrusion 45a of the bearing fixing member 45, and is provided on the other axial end side of the motor shaft 13 relative to the first communication hole 41 and the second communication hole 44, that is, on the substrate housing chamber 34b side. It has been. An arc-shaped notch 46c corresponding to the outer peripheral surface of the bearing support 24b is formed on the base end side in the height direction (gear case 20 side) of the facing wall 46a. The partition wall 46 is installed in a state where the notch 46c is fitted to the outer peripheral surface of the bearing support portion 24b. In addition, a protrusion 46d having a substantially rectangular cross section is provided on the front end side in the height direction (gear cover 22 side) of the opposing wall 46a, and protrudes from the central portion in the longitudinal direction of the opposing wall 46a toward the motor body 11 side. .

  On the other hand, the pair of side wall portions 46 b are provided on the outer side in the longitudinal direction of the opposing wall portion 46 a (outside in the left-right direction in FIG. 7) than the first communication hole 41 and the second communication hole 44. End surfaces 46e of the pair of side walls 46b opposite to the opposing wall portion 46a side, that is, both end surfaces of the partition wall 46 are extended toward the brush holder housing portion 24a side toward the inner wall surface side of the gear case 20, and It is arranged close to the inner wall surface. Here, the inner wall surface side of the gear case 20 is the outer peripheral fitting portion side between the gear case 20 and the gear cover 22. That is, the partition wall 46 has a substantially cross-sectional shape that surrounds the opening of the first communication hole 41 and the second communication hole 44 between the pair of side wall portions 46 b and the opposing wall portion 46 a between the inner wall surface of the gear case 20. It has a letter shape. A gap is set between the end surface 46e of the side wall portion 46b and the inner wall surface of the gear case 20 so as to suppress the passage of the brush wear powder. Note that the end surface 46e of the side wall 46b is brought into contact with the inner wall surface of the gear case 20, so that the passage of brush wear powder between the end surface 46e of the side wall portion 46b and the inner wall surface of the gear case 20 may be further suppressed. Of course it is good.

  As shown in FIG. 6, the partition wall 46 has a base end in the height direction in contact with the gear case 20 and a front end in the height direction in contact with the back surface of the gear cover 22. That is, the partition wall 46 disposed between the gear case 20 and the gear cover 22 is set to a height that contacts the gear case 20 and the gear cover 22, and brush wear between the partition wall 46, the gear case 20, and the gear cover 22 is performed. The passage of powder can be suppressed. In addition, the height direction base end portion and the height direction front end portion of the partition wall 46 may be brought close to the gear case 20 and the gear cover 22 through a gap that can suppress the passage of the brush wear powder, respectively. .

  As shown in FIG. 7, the gear case 20 is provided with a pair of support walls (wall receiving portions) 47 so as to be close to the inside of the pair of side wall portions 46 b (inside in the left-right direction in FIG. 7). The support wall 47 has a substantially rectangular parallelepiped shape facing the front end side in the longitudinal direction of the side wall portion 46b. A gap is set between the support wall 47 and the side wall portion 46b so as to suppress the passage of the brush wear powder. The support wall 47 supports the side wall portion 46 b of the partition wall 46, thereby preventing the partition wall 46 from being displaced with respect to the gear case 20. Further, a gap between the end surface 46 e of the side wall portion 46 b and the inner wall surface of the gear case 20 is covered with the support wall 47. Thereby, since the penetration path | route of the brush wear powder in the longitudinal direction front end side of the side wall part 46b is extended, it becomes possible to further suppress that brush wear powder penetrate | invades into the board | substrate storage chamber 34b.

  As shown in FIG. 8, a support wall (wall receiving portion) 48 having a U-shaped cross-section to which the projection 46 d of the partition wall 46 is fitted is provided on the back surface of the gear cover 22. The support wall 48 supports the opposing wall portion 46 a of the partition wall 46, thereby preventing the partition wall 46 from being displaced with respect to the gear cover 22.

  As described above, since the partition wall 46 for partitioning the first communication hole 41 and the second communication hole 44 and the substrate storage chamber 34b is provided in the case portion 21, the first communication hole 41 and the second communication hole are provided. It is possible to suppress the brush wear powder that has entered the case portion 21 from the brush holder housing chamber 26 via 44 from entering the substrate housing chamber 34b. Therefore, it is possible to prevent the brush wear powder from adhering to the control board 35 and causing a problem in the control board 35.

  Further, the end surfaces 46e of the pair of side wall portions 46b are extended toward the inner wall surface side of the gear case 20, and the partition wall 46 is formed by the opposing wall portion 46a and the side wall portion 46b to form the first series through holes 41 and the second communication holes 44. Since the cross-sectional shape is substantially U-shaped, the brush wear powder can be effectively prevented from entering the substrate housing chamber 34b, and the partition wall 46 can be installed in a small space without increasing the size of the gear case 20. A partition wall 46 can be provided. That is, both end surfaces of the partition wall 46 are extended toward the outer peripheral fitting portion side of the gear case 20 and the gear cover 22 so as to surround the communication holes 41 and 44, so that the brush wear powder is transferred to the substrate housing chamber 34 b. The cross-sectional shape of the partition wall 46 that is optimal for the motor can be obtained while effectively preventing intrusion.

  Further, since the bearing fixing member 45 is mounted in the first communication hole 41 and the second communication hole 44 and the partition wall 46 is disposed close to the bearing fixing member 45, as shown in FIG. A gap between the base end side in the height direction of the portion 46 a and the gear case 20 is covered with the protruding portion 45 a of the bearing fixing member 45. Thereby, since the penetration path | route of the brush abrasion powder in the height direction base end side of the opposing wall part 46a is extended, it can further suppress that brush abrasion powder penetrate | invades into the board | substrate storage chamber 34b.

  Furthermore, since the partition wall 46 is formed separately from the gear case 20, the gear cover 22, and the cover member 36, the material of the partition wall 46 can be appropriately selected. For example, the partition wall 46 can be formed of an inexpensive material. it can.

  As described above, in the wiper motor 10 shown in FIG. 6, the partition wall 46 is formed separately from the gear case 20, the gear cover 22, and the cover member 36. However, the present invention is not limited to this. The partition wall 46 may be formed integrally with the gear case 20, the gear cover 22, or the cover member 36. 9, 10, and 11 are enlarged cross-sectional views showing a part of a wiper motor according to another embodiment of the present invention. 9, 10, and 11, members similar to those shown in FIG. 6 are given the same reference numerals, and descriptions thereof are omitted.

  A partition wall 51 is provided integrally with the gear case 20 in the case portion 21 of the wiper motor 50 shown in FIG. The partition wall 51 extends and covers the gear cover 22 side so as to surround the first communication hole 41 and the second communication hole 44, and the end surface on the gear cover 22 side of the partition wall 51 is provided close to the opposing surface of the gear cover 22. It has been. Thereby, since each communication hole 41 and 44 and the board | substrate storage chamber 34b are partitioned off by the partition wall 51, the penetration | invasion to the board | substrate storage chamber 34b of brush abrasion powder can be suppressed. Thus, since the number of parts does not increase by providing the partition wall 51 integrally with the gear case 20, the partition wall 51 can be provided without complicating the assembly work and increasing the cost. Further, the assembling work can be easily performed without causing a positional shift of the partition wall 51 with respect to the gear case 20. Further, since no gap is formed between the partition wall 51 and the gear case 20, it is possible to more reliably suppress the brush wear powder from entering the substrate housing chamber 34b.

  A partition wall 61 is provided integrally with the side wall 36 b of the cover member 36 in the case portion 21 of the wiper motor 60 shown in FIG. 10. The partition wall 61 extends and covers the gear cover 22 side so as to surround the first communication hole 41 and the second communication hole 44, and the end surface on the gear cover 22 side of the partition wall 61 is provided close to the opposing surface of the gear cover 22. It has been. Thereby, since each communication hole 41 and 44 and the board | substrate storage chamber 34b are partitioned off by the partition wall 61, the penetration | invasion to the board | substrate storage chamber 34b of brush abrasion powder can be suppressed. Thus, since the number of parts does not increase by providing the partition wall 61 integrally with the cover member 36, the partition wall 61 can be provided without complication of assembly work and high cost. Further, the assembly work can be easily performed without causing a positional shift of the partition wall 61 with respect to the cover member 36. Furthermore, since no gap is formed between the partition wall 61 and the cover member 36, the brush wear powder can be more reliably prevented from entering the substrate housing chamber 34b.

  A partition wall 71 is provided integrally with the gear cover 22 in the case portion 21 of the wiper motor 70 shown in FIG. The partition wall 71 extends and covers the gear case 20 side so as to surround the first communication hole 41 and the second communication hole 44, and the end surface of the partition wall 71 on the side of the gear case 20 is close to the opposing surface of the gear case 20, Is provided. Thereby, since each communication hole 41 and 44 and the board | substrate storage chamber 34b are partitioned off by the partition wall 71, the penetration | invasion to the board | substrate storage chamber 34b of brush abrasion powder can be suppressed. Thus, since the number of parts does not increase by providing the partition wall 71 integrally with the gear cover 22, the partition wall 71 can be provided without complicating the assembly work and increasing the cost. In addition, the assembling work can be easily performed without causing a positional shift of the partition wall 71 with respect to the gear cover 22. Furthermore, since no gap is formed between the partition wall 71 and the gear cover 22, it is possible to more reliably suppress the brush wear powder from entering the substrate housing chamber 34b.

  In the above embodiment, the partition wall 46 has a substantially U-shaped cross section so that the end surfaces 46e of the pair of side wall portions 46b extend to the inner wall surface side of the gear case 20 and surround the communication holes 41 and 44. However, the shape of the partition wall is not limited to this and can be variously changed. FIG. 12 is a rear view showing the back surface of the gear cover of the wiper motor shown in FIG. 11, and shows a partition wall 71 whose sectional shape is changed. In FIG. 12, the same members as those shown in FIG. 8 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 12, the partition wall 71 formed integrally with the gear cover 22 is opposed to the partition wall 24c and extends in a direction perpendicular to the axial direction of the motor shaft 13 (left and right direction in FIG. 12). The side wall 71b is connected to one end in the longitudinal direction of the opposing wall 71a (the left end in FIG. 12) and extends toward the motor body 11 (upper in FIG. 12). An end surface 71c on the other end side in the longitudinal direction of the opposing wall portion 71a, that is, one end surface of the partition wall 71 is extended toward the right side in FIG. 12 toward the inner wall surface side of the gear case 20, and close to the inner wall surface of the gear case 20 Has been placed. On the other hand, the end surface 71d of the side wall portion 71b opposite to the opposing wall portion 71a side, that is, the other end surface of the partition wall 71 extends toward the inner wall surface side of the gear case 20 in FIG. It is arranged close to the wall. That is, the partition wall 71 has a substantially L-shaped cross section surrounding the first communication hole 41 and the second communication hole 44 between the inner wall surface of the gear case 20 by the side wall portion 71b and the opposing wall portion 71a. . The gaps between the end surface 71c of the opposing wall portion 71a and the end surface 71d of the side wall portion 71b and the inner wall surface of the gear case 20 are set so as to suppress the passage of the brush wear powder. Of course, the end surfaces 71c and 71d may be brought into contact with the inner wall surface of the gear case 20 to further suppress the passage of the brush wear powder between the end surfaces 71c and 71d and the inner wall surface of the gear case 20. It is.

  As described above, the end surface 71c of the opposing wall portion 71a and the end surface 71d of the side wall portion 71b are extended toward the inner wall surface of the gear case 20, and the partition wall 71 is connected to the first series through the opposing wall portion 71a and the side wall portion 71b. Since the cross section is substantially L-shaped so as to surround the hole 41 and the second communication hole 44, it is possible to effectively prevent the brush wear powder from entering the substrate housing chamber 34 b and to install the partition wall 71 in a small space. It is possible to provide the partition wall 71 without enlarging 20. Further, by forming the partition wall 71 to have an L-shaped cross section, it is possible to easily perform integral molding with the gear cover 22. Of course, the sectional shapes of the partition walls 46, 51 and 61 may be changed in the same manner.

  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 power supply portion 27b and the bearing fixing member 45 are provided in the first communication hole 41 and the second communication hole 44. As the communication holes, the brush holder housing chamber 26 and the case portion are provided. What is necessary is just to communicate with the inside of 21.

  Further, in the embodiment, the cover member 36 that partitions the speed reduction mechanism accommodation chamber 34a and the substrate accommodation chamber 34b is provided in the case portion 21, but the speed reduction mechanism accommodation chamber 34a and the substrate are provided without providing the cover member 36. The accommodation chamber 34b may be communicated.

  Furthermore, in the above-described embodiment, the motor of the present invention is applied to the wiper motor 10, but the present invention can also be applied to motors other than the wiper motor 10. Further, the present invention is not limited to a motor in which the motor shaft 13 can rotate in both forward and reverse directions, and can be applied to a motor in which the motor shaft 13 can rotate in only one direction.

  Further, in the embodiment, the gear case 20 is provided with the support wall 47 that supports the side wall 46b of the partition wall 46, and the gear cover 22 is provided with the support wall 48 that supports the opposing wall 46a of the partition wall 46. The number, the installation position, or the shape of the support walls can be changed as appropriate. The same applies to the partition walls 51, 61, 71.

10 Wiper motor (motor)
DESCRIPTION OF SYMBOLS 11 Motor main body 12 Gear part 13 Motor shaft 13a Worm 14 Yoke 15 Permanent magnet 16 Armature 16a Armature core 16b Armature coil 17 Bearing 18 Commutator 20 Gear case (frame)
DESCRIPTION OF SYMBOLS 21 Case part 22 Gear cover 23 Mounting screw 24 Motor connection part 24a Brush holder accommodating part 24b Bearing support part 24c Partition 25 Fixing screw 26 Brush holder accommodating chamber 27 Brush holder 27a Brush 27b Power feeding part (power feeding connector)
28, 29 Bearing 30 Worm wheel 31 Output shaft 34a Deceleration mechanism accommodation chamber 34b Substrate accommodation chamber 35 Control board 36 Cover member 36a Through hole 36b Bottom wall 36c Side wall 37 Hall sensor 38 Sensor magnet 41 First series of holes 42 Power supply terminal 43 Connector 44 Second communication hole 45 Bearing fixing member 45a Projection part 46 Partition wall 46a Opposite wall part 46b Side wall part 46c Notch 46d Projection part 46e End face 47, 48 Support walls 50, 60, 70 Wiper motor (motor)
51, 61, 71 Partition wall 71a Opposite wall 71b Side wall 71c, 71d End face

Claims (6)

A motor body having a motor shaft;
A gear case including a motor connecting portion to which the motor body is attached and a bottomed case portion;
A gear cover for closing the opening side of the case portion;
A brush holder housing chamber for housing a brush holder provided in the motor connecting portion and provided with a brush for supplying power to the motor body;
A substrate accommodation chamber for accommodating a control substrate provided in the case portion and controlling the rotational drive of the motor shaft;
A communication hole communicating the brush holder housing chamber and the inside of the case portion;
A motor provided in the case portion and disposed between the gear case and the gear cover, and having a partition wall that partitions the communication hole and the substrate housing chamber. The motor according to claim 1, wherein the partition wall includes a side wall portion and an opposing wall portion coupled to the side wall portion.
At least one of the end surface of the side wall portion and the end surface of the opposing wall portion extends toward the inner wall surface of the gear case;
The motor, wherein the side wall portion and the opposing wall portion are formed to surround the communication hole.   3. The motor according to claim 1, wherein a bearing fixing member that fixes a bearing that rotatably supports the motor shaft is attached to the communication hole, and the partition wall is provided in proximity to the bearing fixing member. A motor characterized by   The motor according to any one of claims 1 to 3, wherein the partition wall is formed integrally with the gear case or the gear cover.   The motor according to claim 1, wherein the partition wall is formed separately from the gear case and the gear cover.   The motor according to any one of claims 1 to 3, wherein the case portion divides a reduction mechanism housing chamber that houses a reduction mechanism that transmits the motor shaft by decelerating and transmitting the rotation of the motor shaft. A motor comprising a cover member and the partition wall formed integrally with the cover member.

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