JP5058688B2 - Electric motor with reduction mechanism and housing case for electric motor - Google Patents

Description

  The present invention relates to an electric motor with a speed reduction mechanism including a motor main body having a rotation shaft, and a speed reduction mechanism for reducing the rotation of the rotation shaft and outputting from the output shaft, and a connection unit for electrically connecting the power source and the motor main body. It is related with the storage case for electric motors which store.

  As a drive source for a wiper device, a power window device, a sunroof device or the like provided in a vehicle, an electric motor that is operated by a power source such as a battery mounted on the vehicle is usually used. In order to adapt the electric motor to these devices, it is necessary to reduce the rotational speed of the motor to a desired rotational speed. Therefore, such an electric motor is made into one unit as an electric motor with a speed reduction mechanism with a speed reduction mechanism attached.

  Usually, this electric motor with a speed reduction mechanism has a housing case for housing a connection unit that electrically connects the power source and the motor body. In general, the storage case is supplied as a part for an electric motor with a cover in order to prevent foreign matter from entering inside.

For example, in Patent Document 1, a connection unit mainly composed of a substrate, a circuit element mounted on the substrate, and a connection terminal provided on the back surface of the substrate is accommodated, and in particular, foreign matters are mixed on the substrate. In order to prevent this, an electric motor having a storage case covered with a lid has been proposed.
Japanese Patent No. 3650261

  However, if the housing case is covered, the inside of the housing case becomes invisible, so even after the housing case is manufactured, even if the members constituting the connection unit are not aligned or the components are not connected, There was a problem that could not be found.

  An object of the present invention is to make it possible to confirm that the housing case is provided with the constituent members of the connection unit and the connection locations between the constituent members.

The electric motor with a speed reduction mechanism according to the present invention is an electric motor with a speed reduction mechanism including a motor body having a rotation shaft and a speed reduction mechanism that decelerates the rotation of the rotation shaft and outputs the rotation from the output shaft. An armature including a commutator fixed to a shaft and a coil connected to the commutator, a motor yoke having a magnet mounted on an inner surface thereof, and rotatably accommodating the armature, mounted inside the motor yoke, and a brush holder for holding a pair of brushes in sliding contact with the commutator, being fixed to the motor yoke and a gear case for accommodating the reduction mechanism therein includes a pair of power supply terminals which are respectively connected to the power supply, on the gear case Connector, a pair of power supply side connection plates respectively connected to the power supply terminals, and the brush respectively A connection unit and a pair of brush-side connecting plate being connection, is disposed on the outer surface of the gear case, and the yield capacity case you accommodate the connecting unit therein is provided in the housing case, and, The presence or absence of the connection unit can be confirmed before the housing case is disposed on the outer surface of the gear case, while the housing case is closed by the outer surface of the gear case when the housing case is disposed on the outer surface of the gear case. And a confirmation window .

The electric motor with a speed reduction mechanism according to the present invention is an electric motor with a speed reduction mechanism including a motor body having a rotation shaft and a speed reduction mechanism that decelerates the rotation of the rotation shaft and outputs the rotation from the output shaft. An armature including a commutator fixed to a shaft and a coil connected to the commutator, a motor yoke having a magnet mounted on an inner surface thereof, and rotatably accommodating the armature, mounted inside the motor yoke, and a brush holder for holding a pair of brushes in sliding contact with the commutator, being fixed to the motor yoke and a gear case for accommodating the reduction mechanism therein includes a pair of power supply terminals which are respectively connected to the power supply, on the gear case Connector, a pair of power supply side connection plates respectively connected to the power supply terminals, and the brush respectively A connection unit comprising: a pair of brush-side connection plates that are connected; and a noise prevention unit that has one end connected to the pair of power-feeding-side connection plates and the other end connected to the pair of brush-side connection plates; It is disposed on the outer surface of the gear case, and the yield capacity case you accommodate the connecting unit therein is provided in the housing case, and the connection before the housing case is disposed on an outer surface of the gear case While the presence / absence of the unit can be confirmed, a confirmation window is provided that is closed by the outer surface of the gear case when the housing case is disposed on the outer surface of the gear case .

With reduction gear mechanism an electric motor of the present invention, the side surface of the housing case, whereas the accommodating case can be viewed inside of the housing case before being placed on the outer surface of the gear case, the housing case is the gear case In the state of being arranged on the outer surface of the motor , a connection confirmation window that is covered with the motor yoke or the connector is formed .

Internal housing case for electric motor of the present invention is used for the electric motor, the connection unit comprising a pair of power source side connection plate are connected to a power source, and a pair of motor-side connecting plate are connected to the motor body And a housing case for an electric motor that is disposed on an outer surface of a gear case that houses a speed reduction mechanism therein, and is capable of confirming the presence or absence of the connection unit before being disposed on the outer surface of the gear case. some one, is in a state of being disposed on the outer surface of the gear case and said Rukoto to have a confirmation window is closed by the outer surface of the gear case.

The storage case for an electric motor of the present invention is used for an electric motor, and a pair of power-side connection plates connected to a power source, a pair of motor-side connection plates respectively connected to a motor body, and one end of the pair A housing unit for an electric motor in which a connection unit including a noise preventing means connected to a power supply side connection plate and having the other end connected to the pair of motor side connection plates is housed inside the gear case. while it is possible to confirm the presence or absence of the connection unit prior to being placed on the sides, in a state of being disposed on an outer surface of the gear case and said Rukoto to have a confirmation window is closed by the outer surface of the gear case .

According to the present invention, since the confirmation window capable of confirming the presence or absence of the connection unit is formed in the storage case that stores the connection unit, before placing the storage case on the outer surface of the gear case even if the storage case is covered, You can look inside the storage case from the confirmation window. As a result, it is possible to confirm that the housing case is provided with the constituent members of the connection unit and the connection locations between the constituent members. On the other hand, in a state where the housing case is disposed on the outer surface of the gear case, the confirmation window is covered with the outer surface of the gear case.

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

  FIG. 1 is a perspective view showing a wiper motor according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the wiper motor shown in FIG.

  A wiper motor 11 shown in FIG. 1 is used as a drive source of a rear wiper device provided in a vehicle, and is an electric motor with a speed reduction mechanism in which a motor body 12 and a speed reducer 13 are formed as one unit.

  As shown in FIG. 2, the motor main body 12 is a motor with a brush provided with a rotating shaft 12a, and a commutator 14 (commutator) and an armature core (not shown) are fixed to the rotating shaft 12a. . A plurality of coils (armature windings) (not shown) are wound around the slots of the armature core, and the ends of these coils are respectively connected to corresponding segments of the commutator. The armature (armature) is connected by the commutator 14 and the coils. 15 is configured.

  The motor body 12 includes a motor yoke (yoke) 16 formed in a cylindrical shape with a bottom having an oval cross section, and the armature 15 has one end of a rotating shaft 12 a supported rotatably on the bottom of the motor yoke 16. Thus, the motor yoke 16 is rotatably accommodated. A pair of magnets (not shown) are mounted on the inner surface of the motor yoke 16 with different magnetic poles facing each other, and an armature core on which a coil is wound is formed by these magnets and the motor yoke 16. It is located in the magnetic field.

  3 is a power supply circuit diagram of the wiper motor shown in FIG. 1, and FIG. 4 is a perspective view showing details of a brush holder provided in the motor body.

  The wiper motor 11 is provided with a power feeding circuit 21 shown in FIG. 3 in order to supply a drive current to the motor body 12. The power supply circuit 21 has a pair of brushes 22a and 22b that are in sliding contact with the outer peripheral surface of the commutator 14. In order to hold the brushes 22a and 22b, as shown in FIG. A brush holder 23 is mounted.

  As shown in FIG. 4, the brush holder 23 is formed of a resin material, and is formed in a cylindrical shape along the inner surface of the motor yoke 16 and a main body wall portion 23a perpendicular to the axial direction of the rotating shaft 12a. And an outer peripheral wall portion 23 b covering the outer periphery of the motor yoke 16. The outer peripheral wall portion 23 b is mounted inside the motor yoke 16 so as to be in sliding contact with the inner surface of the motor yoke 16. Further, a through hole 23c is formed in the axis of the main body wall portion 23a. When the brush holder 23 is attached to the motor yoke 16, the commutator 14 of the armature 15 is inserted into the through hole 23c and the main body wall portion 23a. It is arranged inside.

  As shown in FIG. 4, the pair of brushes 22a and 22b held by the brush holder 23 are fixed to one ends of leaf springs 24a and 24b that are bent in a U-shape, respectively, and these leaf springs 24a and 24b. Are fixed to the brush holder 23 by fastening members (bolts) 25, so that the brushes 22a and 22b are brought into sliding contact with the outer peripheral surface of the commutator 14 while being urged by the leaf springs 24a and 24b. Yes. The plate springs 24a and 24b are formed of a metal plate such as a copper plate. When a direct current is supplied to the plate springs 24a and 24b, the current is supplied to the brushes 22a and 22b via the plate springs 24a and 24b. It has become so. When a current is supplied to the brushes 22a and 22b, the current is commutated by the commutator 14 and supplied to the coils. As a result, the coils in the magnetic field are energized to rotate the rotating shaft 12a together with the armature 15. Will do.

  The other elements constituting the power feeding circuit 21 will be sequentially described later.

  FIG. 5 is a partially cutaway sectional view showing the internal structure of the speed reducer shown in FIG.

  On the other hand, the speed reducer 13 has a gear case 26 fixed to the motor yoke 16. The gear case 26 is made of a conductor such as an aluminum alloy, and is electrically connected to the motor yoke 16 when fixed to the motor yoke 16.

  As shown in FIG. 5, a reduction mechanism 28 is accommodated in the gear case 26. The speed reduction mechanism 28 is a worm gear mechanism that includes a worm 31 and a worm wheel 32 that meshes with the worm 31. The worm 31 is integrally formed on the outer peripheral surface of the rotating shaft 12 a that protrudes into the gear case 26, and the worm wheel 32. Is supported by a support shaft 33 provided in the gear case 26 and is rotatable inside the gear case 26. Therefore, when the motor body 12 is operated and the rotary shaft 12a rotates, the rotation is reduced to a predetermined number of rotations by the speed reduction mechanism 28 and transmitted to the worm wheel 32.

  Further, the speed reducer 13 is provided with a power conversion mechanism 34 for converting the rotation of the worm wheel 32 into a swinging motion and transmitting it to the output shaft 27. The power conversion mechanism 34 includes a power conversion member 35 and an output gear 36. The power conversion member 35 includes an arm portion 35 a and a sector gear portion 35 b, and the distal end portion of the arm portion 35 a is warmed by a connecting shaft 37. The wheel 32 is rotatably connected to a position away from the rotation center axis. On the other hand, the output gear 36 is fixed to the base end portion of the output shaft 27 protruding into the gear case 26 and meshed with the sector gear portion 35 b of the power conversion member 35. A gear shaft 38 is provided at the axis of the sector gear portion 35b, and the gear shaft 38 and the output shaft 27 are slidably connected by a plate member 39, whereby the sector gear portion 35b is connected to the output gear 36. Are held in a state of being engaged with each other.

  With such a structure, when the motor main body 12 is operated and the worm wheel 32 is rotated, the arm portion 35a is reciprocated by the rotation, and the sector gear portion 35b is oscillated with respect to the output gear 36. Is converted into a swinging motion and output from the output shaft 27. That is, in the wiper motor 11, the rotational motion of the rotary shaft 12 a that is the power of the motor body 12 is decelerated by the speed reduction mechanism 28 and converted into a swing motion by the power conversion mechanism 34 and output from the output shaft 27. Yes.

  As shown in FIG. 1, the gear case 26 is formed with a boss portion 26a that protrudes parallel to the support shaft 33, and the output shaft 27 is parallel to the support shaft 33 and is rotatably supported by the boss portion 26a. Yes. Further, the distal end of the output shaft 27 protrudes to the outside from the boss portion 26a, and a rear wiper arm constituting the rear wiper device is attached to the distal end. Thereby, when the motor main body 12 is operated, the rear wiper arm swings together with the output shaft 27, and the wiping operation by the rear wiper device is performed.

  The wiper motor 11 is provided with a connector 43 for connecting the power feeding circuit 21 to a power source 41 such as a battery mounted on the vehicle and a wiper switch 42. As shown in FIG. 1, the connector 43 is formed as an independent unit, arranged on the outer surface of the gear case 26, and fixed to the gear case 26 by fastening members (bolts) 44. 3 and 5, the connector 43 is provided with a pair of power supply terminals 45a and 45b. The power supply terminal 45a is connected to the power source 41 and the wiper switch 42 via wiring, It is connected to an external connector (not shown) on the vehicle body side and grounded to the vehicle body. When the wiper switch 42 is turned on, power is supplied from the power supply 41 to the power supply terminal 45a.

  The connector 43 is provided with a switch terminal 46 for an auto stop circuit. The switch terminal 46 is inserted into the gear case 26 through an insertion hole (not shown) provided in the gear case 26 and rotates together with the worm wheel 32. In contact with a relay plate (not shown). When the rear wiper arm is in the lower inverted position, a position detection signal is output from the position detection terminal 47 of the connector 43 to a control device (not shown) via the switch terminal 46 and the relay plate. And even if the wiper switch 42 is randomly stopped, the control device stops the motor main body 12 when the rear wiper arm is in the lower reverse position.

  As shown in FIG. 1, a housing case 51 is disposed on the outer surface of the gear case 26.

  FIG. 6 is a perspective view showing details of the storage case shown in FIG. 1, and this storage case 51 is formed in a vertically long bathtub shape with a resin material, and as shown in FIG. Is assembled to the brush holder 23 so as to follow. That is, the storage case 51 is fixed to the brush holder 23 and is provided integrally with the brush holder 23. When the brush holder 23 is attached to the motor yoke 16, the storage case 51 is opened from the inside of the motor yoke 16. It protrudes to the gear case 26 side via When the gear case 26 is fixed to the motor yoke 16, the housing case 51 is arranged on the outer surface of the gear case 26.

  In the housing case 51, a connection unit 52 that electrically connects the brushes 22a and 22b and the power source 41 is housed. As shown in FIG. 6, the connection unit 52 is a pair of brush-side connections fixed to the end of the housing case 51 on the brush holder 23 side (hereinafter also simply referred to as “end on the brush holder side”). Plates (motor side connection plates) 53a, 53b, a pair of power supply side connection plates (power supply side connection plates) 54a, 54b fixed to the end on the connector 43 side, brush side connection plates 53a, 53b and power supply side connection Noise prevention means 57 provided between the plates 54a and 54b is provided. FIG. 6 shows a state in which the lid of the storage case 51 is removed.

  FIG. 7 is a plan view showing the main part of the connection unit. As shown in FIG. 7, the brush side connection plates 53a and 53b are each formed by bending a metal plate such as a copper plate. On the other hand, as shown in FIG. 4, the brush holder 23 is provided with a wiring board connected to the leaf springs 24a and 24b of the corresponding brushes 22a and 22b, and a pair of unit connection parts 56a and 56b at the ends thereof. have.

  And as shown in FIG. 7, the end part of brush side connection board 53a, 53b is each connected to this unit connection part 56a, 56b. Further, the other end portions of the brush side connection plates 53 a and 53 b protrude parallel to the inside of the housing case 51 through the opening of the motor yoke 16.

A partition wall 55 is provided between the pair of brush side connection plates 53a and 53b so as to protrude from the end on the brush holder side. The partition wall 55 is formed such that the protruding distance L ₁ from the end on the brush holder side is equal to the protruding distance L ₂ from the end on the brush holder side of the brush side connection plates 53a and 53b. Further, in the illustrated example, they are arranged at equal intervals from both the brush side connection plates 53a and 53b, and the width of the front end side half is narrower than the width of the base end side half.

  As described above, in the wiper motor 11, by providing the partition wall 55 between the pair of brush side connection plates 53a and 53b, it is possible to prevent a short circuit due to the flow of solder.

  That is, as shown in FIGS. 4 and 7, when the housing case 51 is assembled to the brush holder 23, the brush side connection plates 53a and 53b are soldered and connected to the unit connection portions 56a and 56b, respectively. At the time of this soldering, the unit connection portions 56a and 56b are arranged at positions close to each other in accordance with the distance between the brush side connection plates 53a and 53b. When the solder flows from the side connection plate, the flowed solder spreads to the other brush side connection plate, which may cause a short circuit.

  On the other hand, in this wiper motor 11, even if solder flows from one brush side connection plate, the flow of solder is stopped by the partition wall 55, and the flowed solder is prevented from spreading to the other brush side connection plate. it can.

Further, as shown in FIG. 7, the brush-side connection plates 53a and 53b are soldered to the unit connection portions 56a and 56b of the brush holder 23, respectively, so that the solder easily flows at the tip portions. However, by making the protruding distance L ₁ from the end of the partition wall 55 on the brush holder side equal to the protruding distance L ₂ from the side end of the brush holder of the brush side connection plates 53a and 53b, one brush side It is possible to prevent the solder flowing from the tip portion of the connection plate from flowing beyond the tip of the partition wall 55 to the other brush side connection plate.

  On the other hand, as shown in FIG. 6, the power supply side connection plates 54 a and 54 b are each formed by bending a metal plate such as a copper plate and arranged in parallel with each other, and one end portion thereof corresponds to the power supply terminal of the connector 43. 45a and 45b, and the other end protrudes in parallel with the inside of the housing case 51.

  Between the brush side connection plates 53a, 53b of the connection unit 52 and the power supply side connection plates 54a, 54b, the brushes 22a, 22b and the power supply terminals 45a, 45b are connected and the brushes 22a, 22b and the commutator 14 are slid. In order to absorb noise generated from the contact portion, a noise prevention means 57 is accommodated in the accommodation case 51 and provided.

  The noise prevention means 57 has a pair of choke coils 58a and 58b and a bidirectional varistor 59 as a capacitive element having the functions of a capacitor and a varistor. A partition wall 60 that is divided into two spaces is provided. The choke coils 58a and 58b are arranged in parallel in the housing case 51 and separated from each other by the partition wall 60. The bidirectional varistor 59 is connected to the choke coils 58a and 58b. Are arranged side by side on the connector 43 side and separated from the choke coils 58a and 58b by a partition wall 60. Each space defined by the partition wall 60 is set to have a shape and size corresponding to the outer shape of the choke coils 58a and 58b and the bidirectional varistor 59, whereby the choke coils 58a and 58b and the bidirectional The flexible varistor 59 can be easily mounted.

  As the capacitive element, only a capacitor or only a varistor may be mounted.

  One end of the choke coil 58a is connected to the brush side connection plate 53a, and the other end is connected to the power supply side connection plate 54a. That is, the choke coil 58a is connected between the brush 22a on the positive electrode side and the power supply terminal 45a on the positive electrode side. Connected in series. Similarly, one end of the choke coil 58b is connected to the brush side connection plate 53b, and the other end is connected to the power supply side connection plate 54b. That is, the choke coil 58b includes the negative electrode side brush 22b and the negative electrode side power supply terminal 45b. Are connected in series. One end of the bidirectional varistor 59 is connected to the power supply side connection plate 54a, and the other end is connected to the power supply side connection plate 54b. That is, the bidirectional varistor 59 is electrically connected between the choke coils 58a and 58b. It is connected to the.

  As a result, even if noise is generated from the sliding contact portion between the brushes 22a and 22b and the commutator 14, the choke coils 58a and 58b and the bidirectional varistor 59 absorb the noise flowing in the power feeding circuit 21 to the outside of the motor. Noise emission can be reduced. Further, since the noise preventing means 57 is provided immediately after the outlet of the power feeding circuit 21 from the motor yoke 16, that is, immediately after the opening through which each of the brush side connection plates 53a and 53b passes, the opening from the inside of the motor yoke 16 is provided. The noise radiated to the outside can be removed by the noise prevention means 57 before propagating to other wirings, etc., thereby reducing the radiation of the noise to the outside of the motor.

  As described above, in the wiper motor 11, the noise preventing means 57 is arranged outside the motor yoke 16, so that noise coming out from the inside of the motor yoke 16 through the opening is propagated to other wirings. Thus, the noise radiated from the wiper motor 11 can be reduced.

  Further, in the wiper motor 11, since the noise prevention means 57 is accommodated in the accommodation case 51 provided integrally with the brush holder 23, the assembly work of the noise prevention means 57 can be facilitated.

  Further, in the wiper motor 11, the partition case 60 is provided in the storage case 51, and the choke coils 58 a and 58 b and the bidirectional varistor 59 are stored in the storage space formed by the partition wall 60. The assembling work of the constituent elements to the housing case 51 can be facilitated.

  Further, in the wiper motor 11, since the housing case 51 is disposed on the outer surface of the motor yoke 16 or the gear case 26, the noise preventing means 57 can be assembled at the final stage of the motor assembling process. Specification of the wiper motor 11 according to the presence or absence of 57 becomes easy.

After housing the connection unit 52 inside the housing case 51 , the housing case 51 is covered with a lid 61, and the housing case 51 is assembled to the brush holder 23. FIGS. 8A and 8B are perspective views showing the storage case 51 with the lid 61 , respectively, and FIG. 9 is a bottom view showing the storage case 51 with the lid 61 .

As shown in FIG. 8 (a), a connection confirmation window 62 is formed on the side of the lid 61 on the fixed side of the brush side connection plate 53b at the connection point between the brush side connection plate 53b and the choke coil 58b . For this reason, before assembling the housing case 51 to the brush holder 23, whether or not the brush-side connecting plate 53b and the choke coil 58b are soldered by looking into the inside of the housing case 51 from the connection confirmation window 62 is determined. It can be confirmed. Although not shown, a similar confirmation window is also formed on the side surface of the brush side connection plate 53a fixed side.

As shown in FIG. 8B, a connection confirmation window 63 is formed on the side surface of the end portion on the connector 43 side of the lid 61 at a connection location between the power supply side connection plates 54 a and 54 b and the bidirectional varistor 59. Yes. Therefore, before assembling the housing case 51 to the brush holder 23 , the power supply side connection plates 54 a and 54 b and the bidirectional varistor 59 are soldered by looking into the inside of the housing case 51 from the connection confirmation window 63. It can be confirmed whether or not.

As shown in FIG. 9, a connection confirmation window 64 a is formed on the bottom surface of the housing case 51 at a connection location between the power supply side connection plate 54 a and the choke coil 58 a. Therefore, before the housing case 51 is arranged on the outer surface of the gear case 26 , the power supply side connection plate 54a and the choke coil 58a are soldered by looking into the inside of the housing case 51 from the connection confirmation window 64a. It can be confirmed whether or not. A similar connection confirmation window 64b is also formed at the connection point between the power supply side connection plate 54b and the choke coil 58b.

Further, choke coil confirmation windows 65a and 65b are formed at locations where the choke coils 58a and 58b on the bottom surface of the housing case 51 are housed . For this reason, it is possible to confirm whether or not the choke coils 58a and 58b are provided by looking through the choke coil confirmation windows 65a and 65b before the housing case 51 is disposed on the outer surface of the gear case 26 , respectively. It has become.

  Further, a varistor confirmation window 66 is similarly formed at a location where the bidirectional varistor 59 is accommodated on the bottom surface of the accommodating case 51.

As shown in FIG. 1, in the state in which the housing case 51 is disposed on the outer surface of the gear case 26, the connection confirmation window 62 for confirming the connection between the brush side connection plates 53a and 53b and the choke coils 58a and 58b is a motor. more covered yoke 16, the feed-side connecting plate 54a, connection confirming window 63 for confirming the connection between 54b and the bidirectional varistor 59 is more covered by the connector 43. In the state where the housing case 51 is disposed on the outer surface of the gear case 26, connection confirmation windows 64a and 64b and choke coil confirmation windows 65a and 65b for confirming the connection between the power supply side connection plates 54a and 54b and the choke coils 58a and 58b. and varistor confirmation window 66 on the outer surface of the gear case 26, and is so that blocked respectively.

As described above, in the housing case 51, the connection confirmation windows 62 and 63 and the connection confirmation windows 64a and 64b are formed, so that the brush-side connection plate 53a, 53b, the power supply side connection plates 54a, 54b, and the connection points between the choke coils 58a, 58b of the noise preventing means 57 and the bidirectional varistor 59, that is, confirm the connection points between the components of the connection unit 52. Can do. Similarly, by forming the choke coil confirmation windows 65a and 65b and the varistor confirmation window 66, the choke coils 58a and 58b of the noise preventing means 57 and the bidirectional varistor 59 which are constituent members of the connection unit 52 are provided in the housing case 51. It can be confirmed that it is provided.

  Further, in the storage case 51, the above-described confirmation windows are formed on the side surface and the bottom surface of the storage case 51, so that when the storage case 51 is assembled to the brush holder 23, these confirmation windows can be closed. it can. Thereby, it can prevent that a foreign material mixes in the storage case 51 from each confirmation window, and short-circuits.

  FIGS. 10A and 10B are cross-sectional views showing a procedure for grounding the motor yoke-side ground terminal to the motor yoke.

  In order to ground the brush 22b on the negative electrode side to the motor yoke 16, the brush holder 23 is provided with a motor yoke side ground terminal 67. The motor yoke side ground terminal 67 is formed by bending a metal plate such as a copper plate, and is fixed to the main body wall portion 23a of the brush holder 23 at the main body portion 67a, and the terminal portion 67b is connected to the main body portion 67a. As shown in FIG. 10 (a), it is bent into a square shape and protrudes from the notch formed in the outer peripheral wall portion 23b to the outside of the outer peripheral wall portion 23b. The main body 67a of the motor yoke side ground terminal 67 is connected to the negative brush 22b and the negative brush side connection plate 53b via a wiring board provided on the brush holder 23.

  When the brush holder 23 is mounted inside the motor yoke 16, as shown in FIG. 10B, the terminal portion 67b of the motor yoke side ground terminal 67 contacts the inner surface of the motor yoke 16 in an elastically deformed state. Thus, the negative brush 22b is grounded to the motor yoke 16. When the negative brush 22b is grounded to the motor yoke 16, the motor yoke 16 has a shielding effect, and noise can be prevented from being radiated to the outside of the motor via the motor yoke 16.

  FIG. 11 is a perspective view showing the gear case before the brush holder is attached, and FIG. 12 is an explanatory view showing the positional relationship between the protrusion and the rotation shaft shown in FIG. FIG. 13 is a cross-sectional view taken along the line AA in FIG. 12, and FIGS. 14A and 14B are front views showing a procedure for connecting the gear case side ground terminal to the protrusion.

  As shown in FIG. 11, a grounding protrusion 68 is provided on the outer surface of the gear case 26. As shown in FIG. 11, the protrusion 68 is formed of a conductor such as aluminum alloy integrally with the gear case 26 and is electrically connected to the gear case 26 and the motor yoke 16. As shown in FIGS. 12 and 13, the protrusion 68 is a surface that passes through the axis of the rotating shaft 12 a of the motor body 12 and is orthogonal to the outer surface of the gear case 26 (indicated by a one-dot chain line in FIG. 13). And on the crossing line (indicated by the alternate long and short dash line in FIG. 12). That is, the protrusion 68 is disposed on the central axis of the motor body 12, that is, the rotating shaft 12 a when viewed from the axial direction of the output shaft 27.

  On the other hand, as shown in FIG. 6, a locking plate 69 is provided at the tip of the housing case 51 on the connector 43 side, and as shown in FIG. 14, a locking groove 69a formed in the locking plate 69 is provided. The housing case 51 is positioned on the gear case 26 by engaging with the protrusion 68. In addition, each of the power supply side connection plates 53a and 53b fixed to the housing case 51 has the protrusion 68 so that the protrusion 68 is positioned in the middle of the housing case 51 when the housing case 51 is positioned by the protrusion 68. They are placed opposite to each other.

  As shown in FIG. 6, a gear case side ground terminal 70 is provided on the negative power supply side connection plate 54 b in order to ground the power supply side connection plate 54 b to the gear case 26. The gear case side ground terminal 70 is configured so that a part of the power supply side connection plate 54 b protruding from the housing case 51 toward the connector 43 side, that is, the tip end portion is folded back from the positive power supply side connection plate 54 a toward the housing case 51. It is formed by bending in a V shape, and is elastically deformable in the bending direction, that is, in a direction approaching and separating from the power supply side connection plate 54b. That is, the gear case side ground terminal 70 is formed of a metal plate such as a copper plate integrally with the power supply side connection plate 54b. When the housing case 51 is positioned on the gear case 26 while being positioned by the protrusion 68, it comes into contact with the side surface of the protrusion 68 in an elastically deformed state as shown in FIG. ing. The housing case 51 is provided with an abutting portion 71 that abuts against the distal end portion of the gear case side ground terminal 70 in contact with the side surface of the projecting portion 68. 68 and the contact portion 71 so as to come into contact with the protrusion 68 more firmly.

  The gear case side ground terminal 70 is grounded to the gear case 26 on the power supply terminals 45a and 45b side of the noise preventing means 57, the gear case 26 is electrically connected to the motor yoke 16, and the motor yoke 16 is further connected to the motor yoke side ground terminal 67. , The noise that could not be absorbed by the noise prevention means 57 is returned to the inside of the motor main body 12 through the gear case 26 and the motor yoke 16, and is thereby radiated to the outside of the motor. Noise can be reduced.

  As described above, in the wiper motor 11, the brush 22 b is grounded to the motor yoke 16 by the motor yoke side ground terminal 67, and the power feeding circuit 21 is disposed on the power feeding terminals 45 a and 45 b side from the noise prevention means 57 by the gear case side ground terminal 70. Since the gear case 26 is grounded, the noise that cannot be removed by the noise prevention means 57 is returned to the inside of the motor body 12 through the gear case side ground terminal 70 and the motor yoke side ground terminal 67, and is then transferred to the outside of the motor. Noise emission can be reduced.

  Further, in the wiper motor 11, the front end portion of the power supply side connection plate 54 b is bent into a V shape to form a gear case side ground terminal 70, and the gear case side ground terminal 70 is formed on a grounding projection 68 provided on the gear case 26. Since the contact is made in an elastically deformed state, the gear case side ground terminal 70 can be brought into contact with the protrusion 68 in a state where a spring force is always applied. In particular, by bending a part of the power supply side connection plate 54b into a V shape to form the gear case side ground terminal 70, a sufficient deflection length can be secured for the gear case side ground terminal 70 even in a narrow space. As a result, the gear case side ground terminal 70 can be reliably brought into contact with the protrusion 68 and the power feeding circuit 21 can be reliably grounded to the gear case 26. Further, by attaching the housing case 51 to the gear case 26, the gear case-side ground terminal 70 can be easily grounded to the protrusion 68. That is, since the gear case side ground terminal 70 can be reliably grounded to the gear case 26 without using a fastening member such as a screw, the number of parts of the wiper motor 11, the number of assembling steps, and the like can be reduced.

  Further, in the wiper motor 11, the protrusion 68 is disposed on a line passing through the axis of the rotating shaft 12a and perpendicular to the outer surface of the gear case 26 and intersecting the outer surface, and a pair of power supply side connection plates 54a and 54b. Are arranged so as to face each other with the projection 68 interposed therebetween, so that the gear case 26 may be formed in two symmetrical shapes according to the specifications such as the mounting state of the vehicle body of the wiper motor 11. The same motor body 12 can be used for each gear case 26. That is, the versatility of the motor main body 12 against the wrongness of the gear case 26 can be improved, and the cost of the wiper motor 11 can be reduced.

  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 present embodiment, the case where the present invention is applied to the wiper motor 11 that drives the rear wiper arm of the vehicle is shown. However, the present invention is not limited to this. For example, driving of a power window device or a sunroof device for a vehicle is performed. The present invention may be applied to a motor or the like used as a source.

  In the present embodiment, the speed reducer 13 is provided with the power conversion mechanism 34. However, the present invention is not limited to this, and the presence of the power conversion mechanism 34 is not limited as long as the speed reduction mechanism 28 is provided.

  Further, in the present embodiment, the brush side connection plates 53a and 53b and the power supply side connection plates 54a and 54b are formed separately, and the connection plates 53a to 54b are connected by the noise preventing means 57. However, the present invention is not limited to this, and the noise prevention means 57 may not be provided, and the brush side connection plates 53a and 53b and the power supply side connection plates 54a and 54b may be integrally formed.

Furthermore, in the present embodiment, the protruding distance L ₁ from the end of the partition wall 55 on the brush holder 23 side is the protruding distance L ₂ from the end of the brush side connecting plates 53a and 53b on the brush holder 23 side. Although equal, the brush-side connecting plates 53a, may be formed to be longer than the protrusion distance L ₂ from the end portion of the brush holder 23 side 53b.

  Furthermore, in the present embodiment, the brush is provided at two locations of the brush holder 23, but at the three or more locations, the brush side connection plate may be provided at three or more locations correspondingly. .

  Furthermore, in the present embodiment, the gear case side ground terminal 70 is formed by bending the front end portion of the power supply side connection plate 54b into a V shape, but the present invention is not limited to this. Any other shape may be used as long as it can be brought into contact with the protruding portion 68 in a state where a part of the power supply side connection plate 54b is elastically deformed, such as a part of which is bent into a dogleg shape.

It is a perspective view which shows the wiper motor which is one embodiment of this invention. It is a disassembled perspective view of the wiper motor shown in FIG. FIG. 2 is a power supply circuit diagram of the wiper motor shown in FIG. 1. It is a perspective view which shows the detail of the brush holder provided in a motor main body. FIG. 2 is a partially cutaway cross-sectional view showing an internal structure of the reduction gear shown in FIG. 1. It is a perspective view which shows the detail of the storage case shown in FIG. It is a top view which shows the principal part of a connection unit. (A), (b) is a perspective view which shows the storage case of the state which each lid | covered. It is a bottom view which shows the storage case of the state with the lid | cover. (A), (b) is sectional drawing which shows the grounding procedure to the motor yoke of a motor yoke side ground terminal, respectively. It is a perspective view which shows the gear case before a brush holder is attached. It is explanatory drawing which shows the positional relationship of the projection part shown in FIG. 11, and a rotating shaft. It is sectional drawing which follows the AA line in FIG. (A), (b) is a front view which shows the connection procedure of the gear case side ground terminal to a projection part, respectively.

Explanation of symbols

11 Wiper motor (electric motor with reduction mechanism)
DESCRIPTION OF SYMBOLS 12 Motor main body 12a Rotating shaft 13 Reducer 14 Commutator 15 Armature 16 Motor yoke 21 Feed circuit 22a, 22b Brush 23 Brush holder 23a Main body wall part 23b Outer peripheral wall part 23c Through-hole 24a, 24b Plate spring 25 Fastening member 26 Gear case 26a Boss part 27 Output shaft 28 Deceleration mechanism 31 Worm 32 Worm wheel 33 Support shaft 34 Power conversion mechanism 35 Power conversion member 35a Arm portion 35b Sector gear portion 36 Output gear 37 Connection shaft 38 Gear shaft 39 Plate member 41 Power supply 42 Wiper switch 43 Connector 44 Fastening member 45a, 45b Power supply terminal 46 Switch terminal 47 Position detection terminal 51 Housing case 52 Connection unit 53a, 53b Brush side connection plate (motor side connection plate)
54a, 54b Power supply side connection plate (power supply side connection plate)
55 Partition wall 56a, 56b Unit connection part 57 Noise prevention means 58a, 58b Choke coil 59 Bidirectional varistor 60 Bulkhead 62 Connection confirmation window 63 Connection confirmation window 64a, 64b Connection confirmation window 65a, 65b Choke coil confirmation window 66 Varistor confirmation window 67 Motor yoke side ground terminal 67a Body portion 67b Terminal portion 68 Projection portion 69 Locking plate 69a Locking groove 70 Gear case side ground terminal 71 Contact portion

Claims (5)

An electric motor with a speed reduction mechanism, comprising: a motor body including a rotation shaft; and a speed reduction mechanism that decelerates rotation of the rotation shaft and outputs the rotation shaft.
An armature comprising a commutator fixed to the rotating shaft and a coil connected to the commutator;
A motor yoke that has a magnet mounted on its inner surface and accommodates the armature rotatably;
A brush holder that is mounted inside the motor yoke and holds a pair of brushes in sliding contact with the commutator;
Is fixed to the motor yoke and a gear case for accommodating the reduction mechanism therein,
A pair of power supply terminals each connected to a power source, and a connector disposed on the gear case;
A connection unit comprising a pair of power supply side connection plates each connected to the power supply terminal, and a pair of brush side connection plates each connected to the brush;
Is disposed on the outer surface of the gear case, and the yield capacity case you accommodate the connecting unit therein,
A state in which the storage case is provided on the outer surface of the gear case, while the connection case can be confirmed before the storage case is disposed on the outer surface of the gear case. Then, the electric motor with a speed reduction mechanism having a confirmation window which is closed by an outer surface of the gear case . An electric motor with a speed reduction mechanism, comprising: a motor body including a rotation shaft; and a speed reduction mechanism that decelerates rotation of the rotation shaft and outputs the rotation shaft.
An armature comprising a commutator fixed to the rotating shaft and a coil connected to the commutator;
A motor yoke that has a magnet mounted on its inner surface and accommodates the armature rotatably;
A brush holder that is mounted inside the motor yoke and holds a pair of brushes in sliding contact with the commutator;
Is fixed to the motor yoke and a gear case for accommodating the reduction mechanism therein,
A pair of power supply terminals each connected to a power source, and a connector disposed on the gear case;
A pair of power supply side connection plates connected to the power supply terminals, a pair of brush side connection plates connected to the brushes, respectively, one end connected to the pair of power supply side connection plates and the other end to the pair A connection unit comprising noise preventing means connected to the brush side connection plate;
Is disposed on the outer surface of the gear case, and the yield capacity case you accommodate the connecting unit therein,
A state in which the storage case is provided on the outer surface of the gear case, while the connection case can be confirmed before the storage case is disposed on the outer surface of the gear case. Then, the electric motor with a speed reduction mechanism having a confirmation window which is closed by an outer surface of the gear case . The deceleration mechanism with the electric motor according to claim 1 or 2, wherein a side surface of said housing case, whereas the accommodating case can be viewed inside of the housing case before being placed on the outer surface of the gear case, the housing In the state where the case is disposed on the outer surface of the gear case, a connection confirmation window which is covered with the motor yoke or the connector is formed . A connection unit that is used for an electric motor and includes a pair of power supply side connection plates that are respectively connected to a power source and a pair of motor side connection plates that are respectively connected to the motor main body is housed inside, and a reduction mechanism inside A housing case for an electric motor disposed on an outer surface of a gear case for housing
It is possible to confirm the presence / absence of the connection unit before being arranged on the outer surface of the gear case, while having a confirmation window that is closed by the outer surface of the gear case in a state of being arranged on the outer surface of the gear case. A storage case for an electric motor. A pair of power-side connection plates used for an electric motor, each connected to a power source, a pair of motor-side connection plates each connected to a motor body, and one end connected to the pair of power-side connection plates An electric motor storage case in which a connection unit including noise preventing means connected to the pair of motor side connection plates at an end is accommodated inside ,
While it is possible to confirm the presence or absence of the connection unit prior to being placed on the outer surface of the gear case, Rukoto is in a state of being disposed on the outer surface of the gear case having a confirmation window is closed by the outer surface of the gear case A storage case for an electric motor.

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