JP4099133B2 - Method for manufacturing terminal assembly, terminal assembly and vehicle wiper motor - Google Patents

Description

  The present invention relates to a method for manufacturing a terminal assembly, a terminal assembly, and a wiper motor for a vehicle.

2. Description of the Related Art Conventionally, in order to prevent the generation of motor noise, a motor brush connected to a noise prevention element such as a choke coil or a capacitor is known. For example, Patent Document 1 discloses a motor having a choke coil connected as a noise preventing member. As shown in FIG. 6 of Patent Document 1, this motor includes a brush in which connection terminals 40 and 41, choke coils 32 and 33, and brushes 29 and 30 to which power supply side connector terminals are connected for power supply are connected. It has a terminal assembly (hereinafter simply referred to as a brush assembly). One end of the choke coils 32 and 33 is connected to the ends of the pigtails 38 and 39 of the brushes 29 and 30 by caulking-fixed connectors 42 and 43, and the other end of the choke coils 32 and 33 is connected to the terminal members 40 and 41 and the fuses. Connected by ging.
JP 2002-315274 A (FIG. 6)

  By the way, in order to constitute the brush assembly described above, connecting tools 42 and 43 for connecting the pigtails 38 and 39 of the brushes 29 and 30 and the choke coils 32 and 33 are necessary. Therefore, a component supply device corresponding to each of the connection tools 42 and 43 is required, and the cost is increased due to maintenance and management of the connection tools 42 and 43. Further, since the connection tools 42 and 43 are small parts, there is a problem that handling such as positioning and holding is difficult in assembly work, and workability is poor.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method of manufacturing a terminal assembly, a terminal assembly, and a vehicle wiper motor that have good workability and can suppress an increase in cost. .

In order to solve the above-mentioned problem, the invention according to claim 1 includes a brush of a motor, a noise prevention element that is connected to the brush at one end to suppress noise of the motor, and a conductive plate material. a manufacturing method of a terminal assembly, comprising: a terminal body, a the end of the noise prevention element together with the connection terminal of the power supply side is connected is connected, the other end of the pre-Symbol noise preventing device is connected and the terminal body to have a connection portion constitutes a terminal member formed integrally with plate member and connecting device had the conductive connecting the one end of the pigtail and the noise preventing device of the brush, after a pigtail of the brush at one end of the noise preventing device connected to at the terminal body integral with said connecting device, disconnect the said terminal body and the connecting device The connecting portion of the terminal body to which the fitting is disconnected and be connected to the other end of the noise preventing device.

According to a second aspect of the present invention, in the method of manufacturing the terminal assembly according to the first aspect, at least one of the connection and the connection of the terminal body by the connection portion is crimped and then welded. It was to so.
According to a third aspect of the present invention, in the method for manufacturing a terminal assembly according to the first or second aspect, the noise prevention element is a choke coil that reduces noise in the FM frequency band of the motor.

Invention of claim 4, the brushes of the motor, and suppresses noise preventing device noise of the motor is connected to one end by a pigtail connection device before Symbol brush, it is formed of a plate material having conductivity the connecting In a terminal assembly comprising a terminal body that is separated from a terminal member in which the tool is integrally formed, and connected to the other end of the noise prevention element while being connected to the connection terminal on the power source side of the motor, The terminal body includes a connection portion connected to the other end of the noise prevention element, a cut portion from which the connection tool is disconnected, and a terminal portion to which a connection terminal on the power source side of the motor is connected. .

According to a fifth aspect of the present invention, in the terminal assembly according to the fourth aspect, the noise prevention element is a choke coil that reduces noise in the FM frequency band of the motor.
According to a sixth aspect of the present invention, there is provided a motor main body provided with an armature having a rotating shaft and a commutator, and the terminal assembly according to the fourth or fifth aspect, constituting the terminal assembly and slidingly contacting the commutator. A brush holder device that holds a brush that supplies driving power to the armature, and a gear housing that is assembled integrally with the motor body and that houses a reduction mechanism that reduces the rotation of the rotation shaft and transmits it to the output shaft. And a vehicle wiper motor for driving the vehicle wiper device.

(Function)
According to the first aspect of the present invention, as a connection part for connecting the pigtail of the brush, the noise prevention element, and the terminal body, the terminal body is provided with the connection portion and the connection tool is formed integrally with the terminal body. A terminal member was used, and the pigtail and one end of the noise prevention element were connected by a connection tool among the terminal members, and the other end of the noise prevention element was connected to the connection portion of the terminal body. Accordingly, since the connector main body and the terminal main body that connect the brush pigtail, the noise prevention element, and the terminal main body can be handled as one terminal member, it is possible to reduce the maintenance and the parts supply device. Furthermore, since the connector for connecting the pigtail of the brush and the noise prevention element can be handled as a large component in which the terminal body is integrated, handling such as positioning and holding is easy in the assembly work.

According to the invention described in claim 2 , since the connection is made not only by caulking but also by welding, the reliability of electrical connection is further improved.
According to invention of Claim 3, the noise of the FM frequency band of a motor can be reduced with a choke coil.
According to the fourth aspect of the invention, since the connector main body and the terminal main body that connect the brush pigtail, the noise prevention element, and the terminal main body can be handled as one terminal member, the maintenance of the parts and the parts The supply device can be reduced. Furthermore, since the connector for connecting the pigtail of the brush and the noise prevention element can be handled as a large component in which the terminal body is integrated, handling such as positioning and holding is easy in the assembly work.

According to the fifth aspect of the present invention, noise in the FM frequency band of the motor can be reduced by the choke coil.
According to the sixth aspect of the present invention, since the connector body and the terminal body for connecting each of the brush tail, the noise prevention element, and the terminal body can be handled as one terminal member, the maintenance of the parts and the parts The supply device can be reduced. In addition, since the connector for connecting the pigtail of the brush and the noise prevention element can be handled as a large component in which the terminal main body is integrated, handling such as positioning and holding is easy in assembly work. Furthermore, the wiper motor is used as a vehicle wiper motor for wiping the front window, and is installed at the lower end of the front window and is mounted near the radio of the vehicle. Can be reduced.

  According to the present invention, it is possible to provide a method of manufacturing a terminal assembly, a terminal assembly, and a vehicle wiper motor that have good workability and suppress an increase in cost.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
A wiper motor 1 shown in FIG. 1 is used as a drive source of a vehicle wiper device that wipes raindrops and the like adhering to a windshield glass (front glass) of a vehicle. Accordingly, the wiper motor 1 is disposed at the lower end of the front window and is mounted in the vicinity of the vehicle radio.

  The wiper motor 1 includes a motor body 2 and a speed reduction unit 3. The yoke housing 4 constituting the motor body 2 is made of a conductive metal material and is formed in a substantially bottomed cylindrical shape. A plurality of magnets 5 are fixed to the inner peripheral surface of the yoke housing 4, and an armature 6 is rotatably accommodated inside each magnet 5. A thrust bearing 8 and a radial bearing 9 that rotatably support the base end portion of the rotating shaft 7 of the armature 6 are provided at the bottom of the yoke housing 4. A gear housing 10 of the speed reduction unit 3 that covers the distal end side of the rotary shaft 7 on which the worm 7 a is formed is assembled to the opening 4 a of the yoke housing 4 with screws 11.

  The gear housing 10 is made of a metal such as an aluminum alloy, and has an opening recess 10 a having substantially the same shape as the opening 4 a of the yoke housing 4. The gear housing 10 is formed with a gear housing recess 10b for housing a speed reduction mechanism including the worm 7a and the worm wheel 12 of the rotating shaft 7 (see FIG. 4). In the gear housing 10, a radial bearing 13 that rotatably supports an intermediate portion of the rotating shaft 7 is fixed to a predetermined portion, and a bearing portion 10 c that rotatably supports the tip portion of the rotating shaft 7 is formed. . A worm 7 a is disposed between the bearing 13 and the bearing portion 10 c, and the worm 7 a is engaged with the worm wheel 12. The worm wheel 12 is drivingly connected to an output shaft 14 arranged in parallel to a direction orthogonal to the direction of the axis L1 of the rotary shaft 7 (wiper motor 1).

  As shown in FIG. 2, a plate cover 15 is attached to the gear housing 10. The plate cover 15 closes the opening 10d of the gear housing recess 10b shown in FIG. Incidentally, as for the plate cover 15 shown in FIG. 5, the inner surface 15a side has faced the paper surface side. The plate cover 15 is integrally provided with a power supply connector 16 connected to a vehicle body side connector (not shown) extending from the vehicle body side and receiving a drive power supply from the vehicle body side. When the drive power is supplied from the power supply connector 16, the motor body 2 is rotationally driven, and the rotation of the rotation shaft 7 (worm 7 a) is decelerated and transmitted to the output shaft 14. A wiper arm (not shown) is drivingly connected to the output shaft 14 via a link mechanism (not shown) of a vehicle wiper device. When the output shaft 14 rotates, the wiper arm performs a predetermined wiping operation. It has become.

  As shown in FIG. 1, a brush holder device 21 is assembled in the opening recess 10 a of the gear housing 10 facing the yoke housing 4. As shown in FIG. 3, the brush holder device 21 includes a substantially annular base plate 22. The base plate 22 is formed of a thermosetting resin having an insulating property such as a phenol resin. A rotating shaft 7 and a commutator 6 a fixed to the rotating shaft 7 are inserted through the center portion of the base plate 22. The base plate 22 (brush holder device 21) is fixed to the gear housing 10 with two screws 24a and 24b via floating support members 23a and 23b made of vibration-proof rubber (elastic material) mounted at two predetermined locations. Has been. That is, since the brush holder device 21 is fixed to the gear housing 10 by the floating support members 23a and 23b, vibrations generated in the brush holder device 21 by the floating support members 23a and 23b are transmitted to the gear housing 10 side. Is suppressed.

  Three brush holders (first to third brush holders) 25, 26 and 27 having a substantially rectangular tube shape are provided on one side surface (surface on the yoke housing 4 side) 22 a of the base plate 22 in the circumferential direction of the plate 22. It is fixed with a predetermined angular interval. The first brush holder 25 and the second brush holder 26 are arranged on a straight line passing through the axis center of the rotating shaft 7 with the rotating shaft 7 interposed therebetween, and the third brush holder 27 is disposed around the base plate 22 from the second brush holder 26. It is arranged at a position shifted by a predetermined angle in the direction. The brush holders 25 to 27 accommodate and hold a common brush 28, a low-speed driving brush 29, and a high-speed driving brush 30 that are slidably held along the radial direction of the armature 6. Each brush 28, 29, 30 is formed in a substantially quadrangular prism shape, and pigtails 28a, 29a, 30a are connected to radially outer ends.

  Support pins 31, 32, and 33 project from the positions near the brush holders 25, 26, and 27 on one side surface 22 a of the base plate 22, respectively. Torsion springs 34, 35, and 36 for urging the brushes 28, 29, and 30 toward the commutator 6a are attached to the support pins 31, 32, and 33, respectively. The tips of the brushes 28 to 30 are always in sliding contact with the commutator 6 a by the elastic force of the torsion springs 34 to 36.

  The base plate 22 is provided with a circuit breaker 41 for circuit protection in the vicinity of the first brush holder 25. The circuit breaker 41 has one connection terminal connected to the other end of the pigtail 28 a fixed at one end to the common brush 28 via a terminal plate 42 a fixed to the base plate 22, and the other connection terminal connected to the base plate 22. It is connected to a fixed terminal plate 42b. The terminal plate 42b is fastened together with the base plate 22 by screws 24b screwed into the screw holes of the gear housing 10, and the circuit breaker 41 is grounded through the terminal plate 42b and the screws 24b.

  In addition, a coil housing portion 45 is formed in the base plate 22 between the second brush holder 26 and the third brush holder 27. The coil housing portion 45 is integrally formed with the base plate 22 and protrudes on both sides of the one side surface 22a and the other side surface 22b of the base plate 22.

  As shown in FIG. 3, the coil housing portion 45 is formed with two recesses 46 a and 46 b arranged along the circumferential direction. Each of the recesses 46 a and 46 b is formed so as to accommodate a choke coil. In the present embodiment, the choke coil 47 is accommodated only in the recess 46 a close to the second brush holder 26. The choke coil 47 functions as a noise prevention element that reduces noise in the FM frequency band of the motor 1. Therefore, the choke coil 47 is disposed at the lower end of the front window and reduces noise generated by the low-speed driving brush 29 in the wiper motor 1 mounted in the vicinity of the radio of the vehicle, thereby reducing the influence on the radio.

  One end of the choke coil 47 is connected to a pigtail 29 a extending from the low-speed driving brush 29 by a connector 48, and the other end is connected to a first brush side terminal (hereinafter simply referred to as a first terminal) 49. The first terminal 49 has a female connection terminal portion 49a (see FIG. 4) as a first connection terminal portion. An insertion hole is formed in the bottom of the recesses 46 a and 46 b in the coil housing portion 45, and the female connection terminal portion 49 a protrudes from the recess 46 a toward the side surface 22 b of the base plate 22 through the insertion hole. It is supported by the provided terminal support 45a.

  On the other hand, as shown in FIG. 3, a second brush side terminal (hereinafter simply referred to as a second terminal) 50 is accommodated in the recess 46 b close to the third brush holder 27. The tip of a pigtail 30a extending from the high-speed driving brush 30 is fixed to the second terminal 50 by caulking.

  Similarly to the first terminal 49, the second terminal 50 has a female connection terminal portion 50a (see FIG. 4) as a first connection terminal portion. The female connection terminal portion 50a protrudes toward the side surface 22b of the base plate 22 through an insertion hole formed in the bottom of the recess 46b, and is supported by the terminal support portion 45b.

  As shown in FIG. 5, five power supply terminals 51 to 55 are laid on the plate cover 15, and one end of each terminal 51 to 55 is a connector housing 16 a of a power supply connector 16 provided on the plate cover 15. It protrudes as a connection terminal inside. Male connection terminal portions 56a and 56b as second connection terminals are formed at the other ends of the two power supply side terminals 51 and 52 among these power supply side terminals 51 to 55, and the male connection terminal portions 56a and 56b are formed. 56b is erected from a predetermined portion of the plate cover 15 corresponding to the female connection terminal portions 49a and 50a. The male connection terminal portions 56a and 56b are fitted into the female connection terminal portions 49a and 50a when the plate cover 15 is attached to the gear housing 10 and the opening 10d of the gear housing recess 10b is closed.

  Contact terminals 57a, 57b, and 57c are connected to the remaining three power supply side terminals 53, 54, and 55. The contact terminals 57a to 57c are in contact with the surface on which the conductive pattern 58a of the rotating plate 58 connected so as to rotate integrally with the worm wheel 12 when the plate cover 15 is mounted. That is, the position of the wiper arm is detected. Then, based on this detection position, when the wiper switch (not shown) is turned off, the wiper arm is always stopped at the home position through the male connection terminal portions 56a and 56b through the female connection terminal portions 49a and 50a. Supply of drive power to the brushes 29 and 30 is maintained, and the wiper motor 1 (motor body 2) is driven.

  The connection tool 48 that connects the pigtail 29a of the low-speed drive brush 29 and the choke coil 47 is disconnected from the first terminal 49 to which the choke coil 47 is connected. That is, the connection tool 48 and the first terminal 49 are manufactured as the terminal member 61 shown in FIGS. 6 (a) and 6 (b). The terminal member 61 is formed from a conductive plate material through a punching process and a bending process. The terminal member 61 includes a caulking portion 62 and a terminal main body 63, and the caulking portion 62 is separated from the terminal main body 63 and used as the connection tool 48. The terminal main body 63 separated from the connection tool 48 is used as the first terminal 49. used.

  The terminal main body 63 is extended in parallel with the main body portion 63a from the main body portion 63a provided with the female connection terminal portion 49a, the abutting portion 63b erected from the main body portion 63a, and the abutting portion 63b. And a cutting portion 63c.

  A connecting piece 64 as a connecting portion for connecting the choke coil 47 is extended to the main body portion 63a together with the female connecting terminal portion 49a. A crimping part 62 (connector 48) is integrally formed at the tip of the cutting part 63c. The crimping part 62 (connector 48) is formed in a U-shape.

  The terminal member 61 is used as shown in FIG. First, the crimping portion 62 of the terminal member 61 is crimped to connect the tip end of the pigtail 29 a of the low-speed driving brush 29 and the end portion 47 a of the choke coil 47. Next, the terminal member 61 is cut | disconnected along the thick line C1 of FIG. 7, and the crimping | crimped part 62, ie, the connection tool 48, is cut | disconnected from the cutting part 63c. Then, the terminal main body 63 from which the connection tool 48 is disconnected, that is, the connection piece 64 of the first terminal 49 is caulked to connect the end portion 47 b of the choke coil 47 to the first terminal 49.

  The connection tool 48 and the connection piece 64 are welded after caulking. By connecting the pigtail 29a and the end portion 47a of the choke coil 47 and the end portion 47b of the choke coil 47 and the first terminal 49 by welding as well as the connection by caulking, the reliability of the electrical connection can be further improved. it can.

  As described above, the first terminal assembly 71 including the low-speed driving brush 29, the choke coil 47, and the first terminal 49 is configured. The first terminal assembly 71 is attached to the base plate 22. At this time, the choke coil 47 and the first terminal 49 are inserted into the recess 46 a of the coil housing portion 45 formed integrally with the base plate 22, and the brush 29 is inserted into the second brush holder 26. The first terminal 49 is inserted into an insertion hole formed in the bottom of the recess 46a. The contact portion 63b of the first terminal 49 is in contact with the bottom surface of the recess 46a, and the female connection terminal portion 49a protrudes toward the side surface 22b of the base plate 22 by a predetermined length. That is, the protrusion amount of the female connection terminal portion 49a from the base plate 22 is set by the length of the main body portion 63a and the contact portion 63b formed by bending from the main body portion 63a.

  The second terminal 50 connected to the high-speed driving brush 30 is formed in a target shape with the terminal member 61. That is, the second terminal 50 has a crimping portion and a terminal main body, and the pigtail 30a of the high-speed driving brush 30 is connected to the second terminal 50 by crimping the crimping portion to constitute a second terminal assembly. Accordingly, since the second terminal 50 and the pigtail 30a of the high-speed driving brush 30 are connected at the caulking portion, the high-speed driving brush 30 and the second terminal 50 can be easily connected. In addition, when the choke coil 47 is connected to the high-speed drive brush 30, the second terminal 50 is used, that is, there is no need to change the terminal, and it is possible to save the trouble of exchanging used parts and managing a plurality of terminals. it can.

  In the second terminal assembly, the second terminal 50 is inserted into the recess 46 b of the coil housing portion 45, and the brush 30 is inserted into the third brush holder 27. Similarly to the first terminal assembly 71, the contact portion of the second terminal 50 is in contact with the bottom surface of the recess 46b, and the protrusion amount of the female connection terminal portion 50a from the base plate 22 is the protrusion amount of the first terminal 49. And the same predetermined length.

  In addition, although it is clear, even when the choke coil 47 is not connected to the low-speed driving brush 29, the terminal member 61 in which the connector 48, the (caulking portion 62) and the first terminal 49 (the terminal body 63) are integrated. Therefore, it is possible to save the trouble of exchanging used parts and managing a plurality of terminals.

As described above, the present embodiment has the following effects.
(1) As a connection part for connecting the pigtail 29a of the low-speed driving brush 29, the choke coil 47, and the first terminal 49, a connection piece 64 is provided in the first terminal 49 and the first terminal 49 (terminal body 63). ) And the terminal member 61 in which the connection tool 48 (crimping part 62) is formed. The pigtail 29a and the end portion 47a of the choke coil 47 are connected by the crimping portion 62 (connector 48) of the terminal member 61, and the choke coil 47 is connected by the connection piece 64 of the terminal body 63 (first terminal 49). The end 47b of the terminal is connected to the terminal body 63. Accordingly, since the connector 48 and the first terminal 49 for connecting the pigtail 29a, the choke coil 47, and the first terminal 49 of the low-speed driving brush 29 can be handled as one terminal member 61, the maintenance of the parts is performed. And parts supply equipment can be reduced.

(2) After the tip of the pigtail 29a and the end 47a of the choke coil 47 are connected by the crimping part 62, the crimping part 62 and the terminal body 63 are separated. Therefore,
The connection tool 48 for connecting the pigtail 29a of the low-speed drive brush 29 and the choke coil 47 can be handled as a terminal member 61, which is a large component integrated with the first terminal 49. Easy to handle.

  (3) Both the connection tool 48 and the connection piece 64 were welded after the caulking process. Therefore, not only the connection by caulking but also the connection by welding is further improved, so that the reliability of the electrical connection is further improved.

  (4) The second terminal 50 is configured in the same manner as the first terminal 49, and the pigtail 30 a of the high-speed driving brush 30 is connected to the second terminal 50 at the caulking portion. Accordingly, since the same terminal can be used regardless of the presence or absence of the choke coil, it is possible to save the trouble of exchanging parts used and managing a plurality of terminals.

In addition, you may change the said form as follows.
In the above embodiment, both the connection tool 48 and the connection piece 64 are welded after the caulking process, but at least one of the connection tool 48 and the connection piece 64 may be welded.

  In the above embodiment, the connection piece 64 is provided on the terminal main body 63 (first terminal 49) and the end portion 47b of the choke coil 47 is connected. However, the connection may be made by welding or fusing.

  In the above embodiment, after the pigtail 29a and the end portion 47a of the choke coil 47 are connected by the crimping portion 62, the crimping portion 62 and the terminal body 63 are separated. And the pigtail 29a and the end portion 47a of the choke coil 47 may be connected by the caulking portion 62 (connector 48).

Sectional drawing of the wiper motor of this embodiment. The external view seen from the bottom face side of the wiper motor. AA sectional view taken on the line AA of FIG. Explanatory drawing in the gear accommodation recessed part in a gear housing. Explanatory drawing of a plate cover. (A) is a front view of a terminal member, (b) is a side view of a terminal member. Explanatory drawing which shows the manufacturing process of a brush assembly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor main body, 6 ... Armature, 6a ... Commutator, 7 ... Rotary shaft, 10 ... Gear housing, 14 ... Output shaft, 21 ... Brush holder apparatus, 29 ... Brush, 29a ... Pigtail, 47 ... Choke coil, 48 ... connector, 49 ... first terminal, 61 ... terminal member, 63 ... terminal body, 63c ... cutting portion.

Claims (6)

A motor brush,
An anti-noise element that has one end connected to the brush and suppresses noise of the motor;
A terminal body to which a connection terminal on the power source side of the motor is connected and the other end of the noise prevention element is connected, made of a conductive plate material;
A method for manufacturing a terminal assembly comprising:
Integral with plate material and the terminal body to have a connection portion to which the other end of the pre-Symbol noise preventing device is connected, a connecting device for connecting one end of the pigtail and the noise preventing device of the brush had the conductive It is formed into a terminal member,
Wherein after the pigtail of the brush connected to one end of said noise preventing device at the terminal body integral with said connecting device, disconnect the said terminal body and the connecting device, wherein the terminal body to which the fitting is disconnected Connecting the connecting portion to the other end of the noise preventing element,
A manufacturing method of a terminal assembly. In the manufacturing method of the terminal assembly according to claim 1,
The terminal assembly manufacturing method according to claim 1, wherein at least one of the connection tool and the connection of the terminal body by the connection portion is crimped and then welded . In the manufacturing method of the terminal assembly according to claim 1 or 2,
The method of manufacturing a terminal assembly, wherein the noise prevention element is a choke coil that reduces noise in the FM frequency band of the motor . A motor brush,
And suppressing noise preventing device noise of the motors being connected to one end by a pigtail before Symbol brush fitting,
A terminal formed from a conductive plate member and separated from a terminal member integrally formed with the connection tool, to which a connection terminal on the power supply side of the motor is connected and connected to the other end of the noise prevention element The body,
In a terminal assembly with
The terminal body includes a connection part connected to the other end of the noise prevention element, a cutting part from which the connection tool is disconnected, a terminal part to which a connection terminal on the power source side of the motor is connected,
A terminal assembly. The terminal assembly according to claim 4,
The terminal assembly according to claim 1, wherein the noise preventing element is a choke coil that reduces noise in the FM frequency band of the motor. A motor body provided with an armature having a rotating shaft and a commutator;
A brush holder device comprising the terminal assembly according to claim 4 or 5 and configured to hold a brush that constitutes the terminal assembly and that is in sliding contact with the commutator and supplies driving power to the armature.
A gear housing that is assembled integrally with the motor body, and that houses a reduction mechanism that reduces the rotation of the rotary shaft and transmits it to the output shaft;
A vehicle wiper motor for driving a vehicle wiper device.

Images