WO2018194147A1 - Wiper motor - Google Patents

Abstract

Provided is a wiper motor provided with: a conductive housing in which a deceleration mechanism is housed; a motor body housed in a yoke connected to the housing and equipped with a brush having a power feeding terminal that contacts a commutator to supply power to a rotor and a ground terminal that has one end contacting the commutator and the other end connected to a conductive partition of the housing, said partition covering an opening portion of the yoke; a power feeding line for supplying the power to the power feeding terminal via a choke coil for removing noise; a ground line for connecting the partition and a ground region to each other; and a capacitor connecting the power feeding line and the ground line to each other and allowing a noise component flowing through the ground line to pass through the choke coil.

Description

Wiper motor

This disclosure relates to a wiper motor.

In a DC motor with a brush used for a wiper motor or the like, when electric power is supplied to the rotor coil via the brush, the rotor rotates. In the brushed DC motor, the electrical connection between the commutator and the brush provided coaxially with the rotor is intermittently switched as the rotor rotates. Such switching of electrical connection is a kind of switching operation, and a noise component whose potential changes at a high frequency is likely to be generated with the operation.

FIG. 8 is a schematic view showing a general wiper motor 100. As shown in FIG. 8, the wiper motor 100 is a deceleration that reduces the rotational speed of the rotating shaft by the motor unit 120 in which the stator and the rotor are housed and the worm gear mechanism provided at the end of the rotating shaft of the rotor. Part 130.

The stator and rotor of the motor unit 120 are provided in a yoke 122 made of aluminum die casting or the like. The yoke 122 has a substantially cylindrical shape with a hollow inside, and houses the stator and the rotor in the internal space.

The speed reduction unit 130 includes the above-described worm gear mechanism housed in an aluminum die-cast housing 132, and the housing 132 and the worm gear mechanism are covered with a resin housing cover 134. The housing cover 134 is provided with a connector 136, and electric power for rotating the wiper motor 100 is supplied via the connector 136.

FIG. 9 is a block diagram showing an example of the electrical configuration of the wiper motor 100. The connector 136 is supplied with a high terminal 136H that is supplied with electric power for rotating the wiper motor 100 at a high speed, and with a voltage lower than that of the high terminal 136H in order to rotate the wiper motor 100 at a lower speed than the aforementioned high speed rotation. And a ground terminal 136N electrically connected to the negative terminal 140N of the brush 140 of the wiper motor 100 through a housing 132 and a yoke 122 made of aluminum die casting. The electrical connection from the negative electrode terminal 140N to the grounding region is performed via the housing 132 of the wiper motor 100, and the structure of the wiper motor 100 can be simplified.

The power supplied from the high terminal 136H is supplied to the commutator 142 via the choke coil 138H that removes the high-frequency component that becomes noise and the positive terminal 140H of the brush 140. The electric power supplied from the Low terminal 136L is supplied to the commutator 142 via the choke coil 138L that removes the high-frequency component that becomes noise and the positive terminal 140L of the brush 140. The motor unit 120 includes a rotor and a stator, which are not shown in FIG.

As described above, a high-frequency noise component is generated by the rotation of the wiper motor 100. The noise component passes through the yoke 122 and the housing 132 from the negative electrode terminal 140N of the brush 140 as indicated by a broken line 160.

The noise prevention capacitors 146 and 148 do not pass direct current but pass alternating current. Therefore, a noise component whose potential changes at high frequency is guided to the choke coil 138L via the capacitor 148. The noise component can also be guided to the choke coil 138H via the yoke 122, the housing 132, and the noise prevention capacitor 146.

The choke coils 138H and 138L are high-inductance elements and exhibit high impedance with respect to high-frequency noise components, so that the noise components are blocked by the choke coils 138H and 138L. Even if the noise components in the choke coils 138H and 138L are not sufficiently cut off, the noise components are supplied to the wiper motor 100 via the positive terminals 140H and 140L and consumed together with the electric power for rotating the wiper motor 100. .

However, in the configuration shown in FIG. 9, the electrical connection between the energization path indicated by the broken line 160 and the capacitor 146 is detoured, and the high frequency noise component is not the capacitor 146 but the broken line 160 in FIG. 8. In addition, it easily flows to the ground terminal 136N side through the yoke 122 and the housing 132. As a result, there is a problem that the noise component is not effectively consumed and the noise component is easily diffused through the yoke 122 and the housing 132. In order to prevent the diffusion of the noise component to the outside, a shield for suppressing the emission of the noise component is required for the yoke 122 and the housing 132 separately.

Japanese Patent Laid-Open No. 2003-134722 discloses an invention of a wiper motor in which conduction of a noise component housing or the like is cut off by connecting a negative electrode terminal of a brush and a ground terminal of a connector with a lead wire.

In Japanese Patent Laid-Open No. 9-226526, when a resin housing cover is attached to a metal housing, the negative electrode terminal of the brush and the ground terminal of the connector are connected by a metal plate sandwiched between the housing side and the housing cover. Thus, an invention of a wiper motor that interrupts conduction of a noise component housing or the like is disclosed.

However, since the wiper motor described in Japanese Patent Laid-Open No. 2003-134722 has a fragile lead wire mounted on the speed reduction portion where the worm gear is rotating, the lead wire may be disconnected. Further, there is a problem that the connecting work of the lead wires is complicated.

In the wiper motor described in JP-A-9-226526, it is not easy to attach a metal plate for connecting the negative electrode terminal of the brush and the ground terminal of the connector in a predetermined manner when the housing cover is attached. If the metal plate is not attached in a predetermined manner, the negative electrode terminal of the brush and the ground terminal of the connector are not electrically connected, and the metal plate may contact the wiper motor housing or the like. In the case of contact, the wiper motor circuit may be short-circuited.

The present disclosure provides a wiper motor that can effectively block a noise component generated with the rotation of the wiper motor and that can easily implement a configuration that blocks the noise component.

A first aspect of the present disclosure includes a conductive housing that houses a speed reduction mechanism, a power supply terminal that is housed in a yoke that is coupled to the housing, and that supplies power to a rotor in contact with a commutator, and one end of the power supply terminal A motor body having a brush having a ground terminal connected to a conductive partition wall of the housing and contacting the commutator and the other end covering the opening of the yoke; and a choke coil for noise removal at the power supply terminal A power supply line for supplying power, a ground line for connecting the partition wall and the ground region, a capacitor for connecting the power supply line and the ground line, and passing a noise component flowing through the ground line through the choke coil, This is a wiper motor.

According to the first aspect, the ground terminal connected to the partition wall of the housing electrically connects the negative electrode terminal of the brush to the ground area via the yoke and the housing, and connects the ground line and the power supply line. High-frequency noise components flowing from the negative electrode terminal of the brush can be effectively guided to the choke coil for noise removal via the capacitor, and as a result, the noise components generated with the rotation of the wiper motor can be effectively blocked. .

A second aspect of the present disclosure is the wiper motor according to the first aspect, wherein the ground line is further connected to an inner wall of the housing between one end of the capacitor and a ground region.

According to the second aspect, the grounding line is further connected to the inner wall of the housing between the one end of the capacitor and the grounding region, so that the noise component that has entered the housing can be effectively guided to the capacitor. As a result, it is possible to effectively block a noise component generated with the rotation of the wiper motor.

According to a third aspect of the present disclosure, in the second aspect, the portions of the ground line connected to the partition and the inner wall of the housing have conductivity and elasticity, and the partition and the inner wall of the housing The wiper motor is in contact with each other and is electrically connected to the housing.

According to the third aspect, by making the connecting portion connected to the partition wall of the ground line and the inner wall of the housing, for example, made of metal having elasticity, the electrical connection between the ground line and the housing can be easily performed. Can do.

According to a fourth aspect of the present disclosure, a conductive housing that houses a speed reduction mechanism, a power supply terminal that is housed in a yoke that is coupled to the housing, and that supplies power to a rotor in contact with a commutator and one end of the power supply terminal A motor main body having a brush having a ground terminal connected to a conductive partition wall of the housing, the other end of which contacts the commutator and covers the opening of the yoke, and a bearing of the rotating shaft of the motor main body are held. The wiper motor further includes a bulge provided in the partition, a power supply line for supplying power to the power supply terminal, and a ground line for connecting the bulge to the ground region.

According to the fourth aspect, by connecting the ground line to the bulge portion provided in the partition wall to which the ground terminal of the brush is connected, it is possible to reduce the distance that the noise component flows through the housing. Radiation of components to the outside world is suppressed.

According to a fifth aspect of the present disclosure, in the fourth aspect, the bulge portion includes a lip portion that sandwiches and locks a plate-like terminal, and one end of the ground line is locked to the lip portion. This is a wiper motor that is formed as described above.

According to the fifth aspect, one end of the ground line is locked to the lip portion, so that the electrical connection between the ground line and the partition wall is ensured.

According to a sixth aspect of the present disclosure, in the fifth aspect, one end of the ground line is deformed in a direction intersecting an assembly direction of the housing cover with respect to the housing, and contacts an inner side surface of the lip portion. The wiper motor.

According to the sixth aspect, the electrical connection between the ground line and the partition wall is ensured by contacting the inner surface of the lip portion while stress is applied to one end of the ground line and deforms.

A seventh aspect of the present disclosure is the wiper motor according to the fifth or sixth aspect, wherein one end of the grounding line is bent so that a tip portion contacts an inner surface of the lip portion.

According to the seventh aspect, the electrical connection between the ground line and the partition wall is ensured by bending the tip of one end of the ground line so as to contact the inner surface of the lip portion.

The eighth aspect of the present disclosure is the wiper motor according to the fourth or fifth aspect, wherein one end of the ground line is formed so as to sandwich a side surface of the bulge portion.

According to the eighth aspect, one end of the ground line sandwiches the bulge portion, so that the electrical connection between the ground line and the partition wall is ensured.

A ninth aspect of the present disclosure is the wiper motor according to the fourth aspect, wherein the bulge portion includes a protrusion, and one end of the ground line is formed so as to contact a top portion and a side surface of the protrusion. It is.

According to the ninth aspect, one end of the ground line comes into contact with the top and side surfaces of the protruding portion of the bulge, so that the electrical connection between the ground line and the partition wall is ensured.

A tenth aspect of the present disclosure is the wiper motor according to the ninth aspect, wherein one end of the ground line is formed so as to be in contact with a part of the top of the protrusion and the side surface of the one.

According to the tenth aspect, the one end of the ground line is in contact with a part of the top of the protrusion and the side surface of the one, so that the electrical connection between the ground line and the partition wall is ensured.

According to an eleventh aspect of the present disclosure, in the ninth or tenth aspect, the protrusion includes a groove at the top, and one end of the ground line is formed so as to contact a side surface of the groove. It is a wiper motor.

According to the eleventh aspect, when one end of the ground line is in contact with the side surface of the groove, the electrical connection between the ground line and the partition wall is ensured.

It is a block diagram showing an example of an electric composition of a wiper motor concerning a 1st embodiment of this indication. It is an example of the schematic diagram of the deceleration part in the state where the housing cover of the wiper motor concerning a 1st embodiment of this indication was removed. It is an example of the schematic diagram at the time of seeing the deceleration part of the wiper motor which concerns on 1st Embodiment of this indication from the arrow A direction of FIG. It is a schematic diagram showing a wiper motor concerning a 1st embodiment of this indication. It is a block diagram showing an example of an electric composition of a wiper motor concerning a 2nd embodiment of this indication. It is a schematic diagram showing a wiper motor concerning a 2nd embodiment of this indication. It is a graph which shows an example of the radiation noise reduction effect of a 1st embodiment of this indication and a 2nd embodiment of this indication. It is the schematic which shows a general wiper motor. It is a block diagram showing an example of an electrical configuration of a general wiper motor. It is the schematic which showed the inner side (side which accommodates the deceleration mechanism of a wiper motor) of the housing cover which concerns on 3rd Embodiment of this indication. It is a perspective view at the time of making a housing cover couple with a housing of a wiper motor concerning a 3rd embodiment of this indication. FIG. 11B is a cross-sectional view of the housing combined with the housing cover, taken along line AA in FIG. 11A. It is a perspective view at the time of combining a housing cover with the housing of the wiper motor concerning a 4th embodiment of this indication. FIG. 12B is a cross-sectional view of the housing combined with the housing cover, taken along line BB in FIG. 12A. It is a perspective view at the time of combining a housing cover with the housing of the wiper motor concerning a 5th embodiment of this indication. FIG. 13B is a cross-sectional view of the housing combined with the housing cover, taken along line CC in FIG. 13A. It is a perspective view at the time of combining a housing cover with the housing of the wiper motor concerning a 6th embodiment of this indication. FIG. 14B is a cross-sectional view of the housing combined with the housing cover, taken along line DD in FIG. 14A. It is a perspective view at the time of combining a housing cover with the housing of the wiper motor concerning the 1st modification of this indication. FIG. 15B is a cross-sectional view of the housing combined with the housing cover, cut along line EE in FIG. 15A. It is a perspective view at the time of combining a housing cover with the housing of the wiper motor concerning the 2nd modification of this indication. FIG. 16B is a cross-sectional view of the housing combined with the housing cover, taken along line FF in FIG. 16A. It is a perspective view at the time of making a housing cover couple with a housing of a wiper motor concerning another mode of the 2nd modification of this indication. FIG. 18B is a cross-sectional view of the housing combined with the housing cover, cut along line GG in FIG. 17A.

[First Embodiment]
FIG. 1 is a block diagram showing an example of an electrical configuration of a wiper motor 10 according to the present embodiment.

As shown in FIG. 1, the wiper motor 10 is a deceleration that reduces the rotational speed of the rotating shaft by a motor unit 20 in which a stator and a rotor are housed and a worm gear mechanism provided at the end of the rotating shaft of the rotor. Part 30.

The stator and rotor of the motor unit 120 are provided in a yoke 22 made of aluminum die casting or the like. The yoke 22 has a substantially cylindrical shape with a hollow inside, and houses the stator and the rotor in the internal space.

The speed reduction unit 30 includes the above-described worm gear mechanism housed in an aluminum die-cast housing 32, and the housing 32 and the worm gear mechanism are covered with a resin housing cover 34.

The connector 36 is supplied with a high terminal 36H that is supplied with electric power for rotating the wiper motor 10 at a high speed, and with a voltage lower than that of the high terminal 36H in order to rotate the wiper motor 10 at a lower speed than the high speed rotation described above. And a ground terminal 36 </ b> N electrically connected to the negative terminal 40 </ b> N of the brush 40 of the wiper motor 10.

The electric power supplied from the high terminal 36H is supplied to the commutator 42 via the high voltage line 56 and the choke coil 38H that removes high-frequency components that become noise and the positive terminal 40H of the brush 40. The electric power supplied from the Low terminal 36L is supplied to the commutator 42 via the low voltage line 58 via the choke coil 38L that removes high-frequency components that become noise and the positive terminal 40L of the brush 40. Each of the high voltage line 56 and the low voltage line 58 is connected to the positive terminals 40H and 40L through an opening 80 provided in the partition wall 50 that separates the motor unit 20 and the speed reduction unit 30. The motor unit 20 includes a rotor and a stator, which are not shown in FIG. The partition wall 50 is configured integrally with the housing 32 and is a part that covers the opening of the housing 32 in a state where the yoke 22 and the housing 32 are coupled. The connector 36 may have one positive charge terminal, one brush positive terminal, and one choke coil.

The ground terminal 36N is a terminal connected to the ground area on the vehicle side. In the wiper motor 10, a ground line 54, a conductive partition wall 50 made of aluminum die casting, a second connection terminal 52C, a breaker 52B, and the like. And electrically connected to the negative terminal 40N of the brush 40 through the first connection terminal 52A. The ground line 54 is connected to the partition wall 50 at the end 54A, and connects the ground terminal 36N, the partition wall 50 shown by the broken line 60, the first connection terminal 52C, the breaker 52B, the first connection terminal 52A, and the negative electrode terminal 40N of the brush 40. Connect electrically. The breaker 52 </ b> B is a device that prevents the damage to the wiper motor 10 and a circuit related to the wiper motor 10 by opening an electric circuit when the current (motor current) of the coil of the wiper motor 10 becomes excessive.

The ground line 54 and the high voltage line 56 are connected by a capacitor 46 for preventing noise. The ground line 54 and the low voltage line 58 are connected by a capacitor 48 for noise prevention. One end of the capacitor 46 is connected between the choke coil 38H of the high voltage line 56 and the High terminal 36H of the connector 36, and the other end is connected between the end 54A of the ground line 54 and the ground terminal 36N of the connector 36. Connected. The capacitor 48 has one end connected between the choke coil 38L of the low voltage line 58 and the low terminal 36L of the connector 36, and the other end connected between the end 54A of the ground line 54 and the ground terminal 36N of the connector 36. Connected between.

The high-frequency noise component is generated by the rotation of the wiper motor 10. The noise component passes from the negative terminal 40N of the brush 40 through the first connection terminal 52A, the breaker 52B, and the second connection terminal 52C, and is shown by a broken line 60 in FIG. As shown in FIG. 4, the partition 50 passes through the ground line 54 from the end 54A.

The noise preventing capacitors 46 and 48 do not pass direct current but pass alternating current. Therefore, a noise component whose potential changes at high frequency is guided to the choke coil 38H via the capacitor 46. The noise component can also be guided to the choke coil 38L via the capacitor 48.

The choke coils 38H and 38L are high-inductance elements and exhibit high impedance with respect to high-frequency noise components, so that the noise components are blocked by the choke coils 38H and 38L. Even if the noise components in the choke coils 38H and 38L are not sufficiently blocked, the noise components are supplied to the wiper motor 10 via the positive terminals 40H and 40L, and are consumed together with the electric power for rotating the wiper motor 10. .

As shown in FIG. 1, in this embodiment, the noise component is conducted to the ground line 54 via the first connection terminal 52A, the breaker 52B, and the second connection terminal 52C. As described above, the distance that the noise component conducts through the partition wall 50 that is a part of the housing 32 of the wiper motor 10 is shorter than that of the wiper motor 100 shown in FIG. 9. In addition, noise components are more likely to pass through the noise preventing capacitors 46 and 48 via the first connection terminal 52A, the breaker 52B, the second connection terminal 52C, and the ground line 54, so that the noise component is more noise than the wiper motor 100 shown in FIG. Effective in reducing components.

FIG. 2 is an example of a schematic diagram of the speed reduction unit 30 with the housing cover 34 of the wiper motor 10 according to the present embodiment removed. Usually, the housing cover 34 is coupled to the housing 32 by a fixing member such as a fixing bolt 68 and covers the inside of the housing 32.

A worm wheel 74 that decelerates the rotational speed of the wiper motor 10 is housed inside the housing 32 of the speed reducing unit 30 with the housing cover 34 removed. A circuit including the high terminal 36H and the high voltage line 56, the low terminal 36L and the low voltage line 58, the ground terminal 36N and the ground line 54, and the capacitors 46 and 48 is configured to straddle the worm wheel 74. Each of the high voltage line 56, the low voltage line 58, and the ground line 54 shown in FIG. 2 is formed of a rigid metal wire or metal plate.

The high voltage line 56 and the low voltage line 58 are connected to the positive terminals 40H and 40L of the brush 40 through openings provided in the partition wall 50, respectively. Since the partition 50 is conductive, the high voltage line 56 and the low voltage line 58 pass through the opening of the partition 50 while being covered with the insulating member 76.

As shown in FIG. 2, the ground line 54 is electrically connected to the partition wall 50 by the end 54A. The ground line 54 has electrical conductivity and elasticity at the end 54A, and may be electrically connected by the end 54A coming into contact with the partition wall 50. However, in order to ensure the connection, a bolt or the like is used. The end 54A may be fixed to the partition wall 50 using a fixing member.

FIG. 3 is an example of a schematic diagram when the speed reduction unit 30 of the wiper motor 10 according to the present embodiment is viewed from the direction of arrow A in FIG. FIG. 3 shows a state where the yoke 22, the rotor and the stator are removed, and the configuration of the brush 40 is shown. In addition, an output shaft 78 provided coaxially with the worm wheel 74 of the speed reduction unit 30 is shown. A link mechanism or the like of the wiper device is connected to the end of the output shaft 78.

The positive terminals 40H and 40L and the negative terminal 40N constituting the brush 40 are in contact with a commutator 42 (not shown) of the wiper motor 10 to supply power to the rotor. As shown in FIG. 3, the first connection terminal 52A is connected to the negative terminal 40N. The first connection terminal 52A is connected to the breaker 52B. The breaker 52B is connected to the partition wall 50 via the second connection terminal 52C.

FIG. 4 is a schematic diagram showing the wiper motor 10 according to the present embodiment. The noise component generated by the rotation of the wiper motor 10 partially flows to the ground terminal 36N side via the ground line 54 as shown by a broken line 62 in FIG. Through the choke coil 38L. As a result, the noise component is effectively consumed, and the emission of the noise component to the outside world is suppressed.

As described above, according to the present embodiment, the partition wall 50 is made to be a noise component by disposing the circuit for electrically connecting the connector 36 and the brush 40 including the capacitors 46 and 48 for preventing noise. Is reduced, and the noise component is led to the noise prevention capacitors 46 and 48, whereby the emission of the noise component to the outside is suppressed.

[Second Embodiment]
Next, a second embodiment of the present disclosure will be described. As shown in FIG. 5, the wiper motor 12 according to the present embodiment is different from the first embodiment in that a third connection terminal 70 is provided, but other configurations are the same as those in the first embodiment. Since it is the same as the form, detailed description of other configurations is omitted.

As shown in FIG. 5, the third connection terminal 70 has one end connected between the other end of the capacitor 48 of the ground line 54 and the ground terminal 36N of the connector 36 and the other end electrically connected to the inner wall of the housing 32. Connected. As a result, the noise component flows from the negative terminal 40N of the brush 40 to the third connection terminal 70 through the partition 50 and the path of the housing 32 indicated by the broken line 66. Similar to the first embodiment, the noise component also flows to the end portion 54A of the ground line 54 through the path of the partition wall 50 indicated by the broken line 60. As a result, the noise component is exhausted through the choke coils 38H and 38L via the capacitors 46 and 48. Alternatively, part of the noise component is guided to the ground area of the vehicle via the ground terminal 36N.

In the present embodiment, compared to the first embodiment, the distance that the noise component conducts through the structure (partition wall 50) of the wiper motor 10 becomes longer. However, the third connection terminal 70 allows the noise prevention capacitor 46 to be connected. , 48 are connected to the ground line 54, so that noise components easily flow.

FIG. 6 is a schematic diagram showing the wiper motor 10 according to the present embodiment. The noise component generated by the rotation of the wiper motor 12 partially flows to the ground terminal 136N side through the housing 32 as shown by the broken line 66 in FIG. 6, but the remaining noise component is shown by the broken line 72, for example. In this way, it is guided to the choke coil 38L through the capacitor 48. As a result, the noise component is effectively consumed, and the emission of the noise component to the outside world is suppressed. The portion of the third connection terminal 70 that is connected to the inner wall of the housing 32 has conductivity and elasticity, and may be configured to contact the inner wall of the housing 32 and be electrically connected to the housing. The third connection terminal 70 may be fixed to the inner wall of the housing 32 with a fixing member such as a bolt.

FIG. 7 is a graph showing an example of the radiation noise reduction effect of the present embodiment (Act 2) and the first embodiment (Act 1). As shown in FIG. 7, this embodiment has the most remarkable noise reduction effect from low frequency components to high frequency components.

As described above, according to the present embodiment, a circuit that electrically connects the connector 36 and the brush 40 including the capacitors 46 and 48 for preventing noise is disposed, and the housing is formed by the third connection terminal 70. By directing the noise component flowing through 32 to the capacitors 46 and 48 for preventing noise, radiation of the noise component to the outside is suppressed.

[Third Embodiment]
Next, a third embodiment of the present disclosure will be described. In the present embodiment, the same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 10, the wiper motor according to the present embodiment includes a ground line 254, a high voltage line 256, and a low voltage line 258 inside the resin housing cover 234 (on the side that houses the reduction mechanism of the wiper motor). It is arranged.

One end 256H1 of the high voltage line 256 is connected to the High terminal 36H (see FIG. 2) of the connector 36, and one end 258L1 of the low voltage line 258 is connected to the Low terminal 36L (see FIG. 2) of the connector 36. In addition, one end 254N1 of the ground line 254 is connected to the ground terminal 36N of the connector 36 and is disposed up to the fixing bolt contact 170. The fixing bolt contact 170 is in contact with the fixing bolt 68 when the housing cover 234 is coupled to the housing, so that the ground line 254 and the housing are electrically connected via the fixing bolt 68.

The other end 256H2 of the high voltage line 256 and the other end 258L2 of the low voltage line 258 form a protruding terminal so as to be electrically connected to the positive terminals 40H and 40L of the brush 40. The other end 254N2 of the grounding line 254 is a bulge-shaped part (hereinafter referred to as “hereinafter,“ This terminal is electrically connected to the bulge.

FIG. 11A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to the present embodiment, and FIG. 11B illustrates the housing 232 coupled with the housing cover 234 along the line AA in FIG. 11A. It is sectional drawing at the time of cut | disconnecting along. As shown in FIG. 11A, the other end 254N2 of the ground line 254 contacts the upper end of the bulge 260 that covers the bearing of the rotating shaft of the wiper motor. The bulge 260 is made of aluminum die cast formed integrally with the partition wall 50 of the housing 232, and the negative electrode terminal 40N (see FIG. 3) of the brush 40 is electrically connected thereto.

As shown in FIG. 11B, the other end 254N2 of the ground line 254 is electrically connected to a lip 262 provided at the upper end of the bulge 260. The lip 262 includes two thin plate-like members formed in parallel. When the housing cover 234 is coupled to the housing 232, the other end 254N2 of the ground line 254 is inserted and locked between the two plate-like members. The tip 266 of the other end 254N2 of the ground line 254 is bent so as to come into contact with the inner surface of the lip 262. When the housing cover 234 is coupled to the housing 232 in accordance with the assembly direction α, it is substantially orthogonal to the assembly direction α. Bends in the bending direction β. As a result, the side surface portion of the other end 254N2 contacts the plate-like member of the lip 262, and the electrical connection between the other end 254N2 and the lip 262 is ensured. A gap is provided between the bottom of the inner surface of the lip 262 and the tip 266 of the other end 254N2. The gap is for preventing the tip 266 of the other end 254N2 from hitting the inner bottom of the lip 262 and adversely affecting the coupling between the housing 232 and the housing cover 234.

The lip 262 is configured as a separate part from the housing 232, and may be fixed to the upper end of the bulge 260 of the housing 232 by electric welding or conductive adhesive. In this embodiment, the lip 262 is die-cast together with the bulge 260. It is cast integrally with the housing 232. Alternatively, the lip 262 is cast integrally with the housing 232 by die casting together with the bulge 260 as one protrusion at the upper end of the bulge 260, and after casting, two thin plate-like members are formed by machining. Also good.

As described above, since the negative electrode terminal 40N of the brush 40 is electrically connected to the partition wall 50 cast integrally with the bulge 260, by bringing the other end 254N2 of the ground line 254 into contact with the bulge 260, The ground line 254 can be electrically connected in the vicinity of the negative electrode terminal 40N of the brush 40, and the distance for conducting noise components from the negative electrode terminal 40N of the brush 40 to the ground line 254 via the housing 232 can be shortened. It becomes possible.

As described above, according to the present embodiment, the distance of the noise component flowing through the housing 232 is shortened compared to the first embodiment and the second embodiment, so that the noise component is transferred to the outside world. Radiation is suppressed.

Further, according to the present embodiment, when the housing 232 and the housing cover 234 are coupled, the tip 266 of the other end 254N2 first contacts the inside of the lip 262, and the other end 252N2 extends along the inside of the lip 262. As attached, the other end 254N2 serves as an assembly guide for the housing cover 234 to which the ground line 254 is attached.

[Fourth Embodiment]
Next, a fourth embodiment of the present disclosure will be described. In the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 12A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to the present embodiment, and FIG. 12B illustrates the housing 232 coupled with the housing cover 234 along the line BB in FIG. 12A. It is sectional drawing at the time of cut | disconnecting along. As shown in FIG. 12A, the ground line 254 has the other ends 254N3A and 254N3B, and the other ends 254N3A and 254N3B are in contact with the side portions of the bulge 260, respectively. As shown in FIG. 12B, the other ends 254N3A and 254N3B of the ground line 254 are electrically connected to the bulge 260 so as to sandwich the side surface portion of the bulge 260. Further, in the present embodiment, since it is not necessary to form the lip 262 that requires fine processing on the bulge 260, when the lip 262 is not formed, the manufacturing cost of the housing 232 compared to the third embodiment. Can be reduced. As shown in FIG. 12B, the tip portions 268A and 268B of the other ends 254N3A and 254N3B are spread outward with respect to the bulge 260, and the bulge 260 can be easily sandwiched when the housing cover 234 is assembled to the housing 232. It is like that.

As described above, since the negative electrode terminal 40N of the brush 40 is electrically connected to the partition wall 50 cast integrally with the bulge 260, the other ends 254N3A and 254N3B of the ground line 254 are connected to the side surface portion of the bulge 260. By making the contact, the ground line 254 can be electrically connected in the vicinity of the negative electrode terminal 40N of the brush 40, and the distance through which the noise component is conducted via the housing 232 from the negative electrode terminal 40N of the brush 40 to the ground line 254. Can be shortened.

As described above, according to the present embodiment, the distance of the noise component flowing through the housing 232 is shortened compared to the first embodiment and the second embodiment, so that the noise component is transferred to the outside world. Radiation is suppressed.

Further, by bringing the other ends 254N3A, 254N3B into contact with the side portions of the bulge 260, the area where the ground line 254 and the housing 232 are in electrical contact can be made larger than in the third embodiment. The ground line 254 and the housing 232 can be reliably connected.

Further, according to the present embodiment, when the housing 232 and the housing cover 234 are coupled, the leading ends 268A and 268B of the other ends 254N3A and 254N3B first contact the side surface of the bulge 260, and along the side surface of the bulge 260 Since the other ends 254N3A and 254N3B are attached, the other ends 254N3A and 254N3B serve as an assembly guide for the housing cover 234 to which the ground line 254 is attached.

[Fifth Embodiment]
Next, a fifth embodiment of the present disclosure will be described. In this embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 13A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to the present embodiment, and FIG. 13B illustrates the housing 232 coupled with the housing cover 234 along the line CC in FIG. 13A. It is sectional drawing at the time of cut | disconnecting along. As shown in FIG. 13A, the ground line 254 has the other ends 254N4A, 254N4B, and 254N4C, and the other ends 254N4A and 254N4C are in contact with the side surfaces of the bulge 260, respectively, as in the fourth embodiment. 254N4B is locked to the lip 262 at the upper end of the bulge 260 as in the third embodiment.

As described above, the negative electrode terminal 40N of the brush 40 is electrically connected to the partition wall 50 cast integrally with the bulge 260, so that the other ends 254N4A, 254N4B, and 254N4C of the ground line 254 contact the bulge 260. By doing so, the ground line 254 can be electrically connected in the vicinity of the negative electrode terminal 40N of the brush 40, and the distance for conducting the noise component from the negative electrode terminal 40N of the brush 40 to the ground line 254 via the housing 232 is increased. It can be shortened.

As described above, according to the present embodiment, the distance of the noise component flowing through the housing 232 is shortened compared to the first embodiment and the second embodiment, so that the noise component is transferred to the outside world. Radiation is suppressed.

Further, according to the present embodiment, when the housing 232 and the housing cover 234 are coupled, first, the distal end 266 of the other end 254N4B abuts on the inner side of the lip 262, and the distal ends 268A, 268B of the other ends 254N4A, 254N4C. The other end 254N4A, 254N4B, 254N4C serves as an assembly guide for the housing cover 234 to which the ground line 254 is attached.

Further, the other ends 254N4A, 254N4C are brought into contact with each other so as to sandwich the side surface portion of the bulge 260, and the other end 254N4B is engaged with the lip at the upper end portion of the bulge 260, thereby making the ground line more than the fourth embodiment. It is possible to increase the number of places where the 254 and the housing 232 are in electrical contact with each other and increase the area related to the contact, and the ground line 254 and the housing 232 can be reliably connected.

[Sixth Embodiment]
Next, a sixth embodiment of the present disclosure will be described. In the present embodiment, the same components as those in the first to fifth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

14A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to the present embodiment, and FIG. 14B illustrates the housing 232 coupled with the housing cover 234 along the line DD in FIG. 14A. It is sectional drawing at the time of cut | disconnecting along. As shown in FIG. 14A, the ground line 254 has the other end 254N5, and the other end 254N5 is electrically connected to the upper end 264 that is a protrusion of the bulge 260.

The front end portion 270 of the other end 254N5 of the ground line 254 is formed so as to cover the upper end portion 264 of the bulge 260 to ensure electrical connection with the upper end portion 264. The ends 270A and 270B of the tip 270 of the other end 254N5 of the ground line 254 are spread outward with respect to the upper end 264, so that the upper end 264 can be easily sandwiched when the housing cover 234 is assembled to the housing 232. It has become.

As described above, since the negative electrode terminal 40N of the brush 40 is electrically connected to the partition wall 50 cast integrally with the bulge 260, the other end 254N5 of the ground line 254 covers the upper end portion 264 of the bulge 260. By making such contact, the ground line 254 can be electrically connected in the vicinity of the negative electrode terminal 40N of the brush 40, and noise components are conducted through the housing 232 from the negative electrode terminal 40N of the brush 40 to the ground line 254. It is possible to shorten the distance to be made.

As described above, according to the present embodiment, the distance of the noise component flowing through the housing 232 is shortened compared to the first embodiment and the second embodiment, so that the noise component is transferred to the outside world. Radiation is suppressed.

Also, by forming the tip 270 of the other end 254N5 of the ground line 254 so as to cover the upper end 264 of the bulge 260, the ground line 254 and the housing 232 can be reliably connected.

Further, according to the present embodiment, since it is not necessary to form the lip 262 that requires fine processing, the manufacturing cost of the housing 232 can be reduced as compared with the third embodiment.

Further, according to the present embodiment, the distal ends 270A and 270B of the distal end portion 270 of the other end 254N5 of the ground line 254 are spread outward with respect to the upper end portion 264, and when the housing 232 and the housing cover 234 are coupled. Since the ends 270A and 270B of the tip 270 of the other end 254N5 of the ground line 254 first contact the upper end 264, the other end 254N5 serves as an assembly guide for the housing cover 234 to which the ground line 254 is attached.

[First Modification of Sixth Embodiment]
Next, a first modification example of the sixth embodiment of the present disclosure will be described. In the present embodiment, the same components as those in the first to sixth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 15A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to this modification, and FIG. 15B is a diagram illustrating the housing 232 coupled with the housing cover 234 along the line EE in FIG. 15A. It is sectional drawing at the time of cut | disconnecting along. As shown in FIG. 15A, the ground line 254 has the other end 254N6, and the other end 254N6 is electrically connected to the upper end 264 of the bulge 260.

The tip portion 272 of the other end 254N6 of the ground line 254 has end portions 272A and 272B that spread outward with respect to the upper end portion 264 of the bulge 260 similarly to the sixth embodiment, and covers the upper end portion 264, The terminal 272 </ b> C contacts the side surface of the recess (groove) of the upper end 264, thereby ensuring electrical connection with the bulge 260. The end 272C is bent so as to come into contact with the side surface of the concave portion of the upper end 264. When the housing cover 234 is coupled to the housing 232 according to the assembling direction α, the end 272C is bent in the bending direction β substantially orthogonal to the assembling direction α. Bend. As a result, the side surface portion of the end 272 </ b> C contacts the side surface portion of the recess of the upper end portion 264.

As described above, since the negative electrode terminal 40N of the brush 40 is electrically connected to the partition wall 50 cast integrally with the bulge 260, the tip 272 of the other end 254N6 of the ground line 254 is connected to the upper end of the bulge 260. The ground line 254 can be electrically connected in the vicinity of the negative electrode terminal 40N of the brush 40 by contacting the side surfaces of the concave portions of the portion 264 and the upper end 264. From the negative terminal 40N of the brush 40 to the ground line 254 The distance through which the noise component is conducted through the housing 232 can be shortened.

As described above, according to the present modification, the distance of the noise component flowing through the housing 232 is shortened compared to the first embodiment and the second embodiment, so that the noise component is transferred to the outside world. Radiation is suppressed.

Further, the tip end portion 272 of the other end 254N6 of the ground line 254 is formed so as to cover the upper end portion 264 of the bulge 260 and is formed so as to be in contact with the side surface portion of the concave portion of the upper end portion 264. And the housing 232 can be more reliably connected than in the sixth embodiment.

Further, according to the present modification, since it is not necessary to form the lip 262 that requires fine processing, the manufacturing cost of the housing 232 can be reduced as compared with the third embodiment.

Further, according to the present embodiment, the ends 272A and 272B of the tip 272 of the other end 254N6 of the ground line 254 are spread outward with respect to the upper end 264, and when the housing 232 and the housing cover 234 are joined together. Since the ends 272A and 272B of the tip 272 of the other end 254N6 of the ground line 254 first contact the upper end 264, the other end 254N6 serves as an assembly guide for the housing cover 234 to which the ground line 254 is attached.

[Second Modification of Sixth Embodiment]
Next, a second modification example of the sixth embodiment of the present disclosure will be described. In the present embodiment, the same components as those in the first to sixth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 16A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to this modification, and FIG. 16B illustrates the housing 232 coupled with the housing cover 234 along the line FF in FIG. 16A. It is sectional drawing at the time of cut | disconnecting along. As shown in FIG. 16A, the ground line 254 has the other end 254N7A, and the tip 274A of the other end 254N7A is formed so as to cover one side surface and a part of the top of the upper end 264 of the bulge 260. 260 is electrically connected. The distal end 274A of the other end 254N7A extends outward with respect to the upper end 264 of the bulge 260 and facilitates contact between the upper end 264 and the distal end 274A when the housing cover 234 is assembled to the housing 232. . Further, the tip 274A of the other end 254N7A bends in a bending direction γ substantially perpendicular to the assembling direction α when the housing cover 234 is coupled to the housing 232 according to the assembling direction α. As a result, the tip 274A of the other end 254N7A is pressed against the top of the upper end 264, and the electrical connection between the other end 254N7A and the upper end 264 is ensured.

This modification may be an embodiment as shown in FIGS. 17A and 17B. 17A is a perspective view when the housing cover 234 is coupled to the housing 232 of the wiper motor according to another aspect of the present modification, and FIG. 17B is a perspective view of the housing 232 coupled with the housing cover 234 shown in FIG. FIG. 10 is a cross-sectional view taken along the line G. As shown in FIG. 17A, the ground line 254 has the other end 254N7B, and the tip 274B of the other end 254N7B is different from the case of FIGS. 16A and 16B in one side and top of the upper end 264 of the bulge 260. It is formed so as to cover the part and is electrically connected to the bulge 260. In addition, the other end of the ground line 254 may be formed so as to cover one side surface and a part of the top portion of the upper end portion 264 and to be in contact with the side surface portion of the recess (groove portion) of the upper end portion 264. .

As described above, since the negative electrode terminal 40N of the brush 40 is electrically connected to the partition wall 50 cast integrally with the bulge 260, the other end 254N7A or the other end 254N7B of the ground line 254 is connected to the upper end of the bulge 260. By making contact with the portion 264, the ground line 254 can be electrically connected in the vicinity of the negative terminal 40N of the brush 40, and noise components are transmitted from the negative terminal 40N of the brush 40 to the ground line 254 via the housing 232. It is possible to shorten the distance of conduction.

As described above, according to the present modification, the distance of the noise component flowing through the housing 232 is shortened compared to the first embodiment and the second embodiment, so that the noise component is transferred to the outside world. Radiation is suppressed.

Further, according to the present modification, since it is not necessary to form the lip 262 that requires fine processing, the manufacturing cost of the housing 232 can be reduced as compared with the third embodiment.

Further, according to this modification, it is sufficient to form the other ends 254N7A and 254N7B of the ground line 254 so as to be electrically connected to the one side surface portion and the one side top portion of the upper end portion of the bulge 260. The manufacturing cost of the product can be reduced as compared with the example.

The disclosures of Japanese Patent Application No. 2017-084035 filed on April 20, 2017 and Japanese Patent Application No. 2018-060588 filed on March 27, 2018 are hereby incorporated by reference in their entirety. Is taken in.

All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually described to be incorporated by reference, Incorporated herein by reference.

Claims (11)

A conductive housing containing a deceleration mechanism;
A power supply terminal that is housed in a yoke that is coupled to the housing and that contacts the commutator to supply power to the rotor, and one end of which contacts the commutator and the other end covers the opening of the yoke A motor body including a brush having a ground terminal connected to the partition wall;
A power supply line for supplying power to the power supply terminal via a choke coil for noise removal;
A ground line connecting the partition wall and the ground region;
A capacitor for connecting the power supply line and the ground line, and passing a noise component flowing through the ground line through the choke coil;
Wiper motor with The wiper motor according to claim 1, wherein the ground line is further connected to an inner wall of the housing between one end of the capacitor and a ground region. The portion of the ground line connected to the partition wall and the inner wall of the housing has electrical conductivity and elasticity, and is in contact with the partition wall and the inner wall of the housing to be electrically connected to the housing. The wiper motor according to 2. A conductive housing containing a deceleration mechanism;
A power supply terminal that is housed in a yoke coupled to the housing, contacts the commutator and supplies power to the rotor, and one end contacts the commutator and the other end covers the opening of the yoke. A motor body including a brush having a ground terminal connected to the partition wall;
A bulge portion provided in the partition so as to hold a bearing of the rotating shaft of the motor body;
A power supply line for supplying power to the power supply terminal;
A ground line connecting the bulge part and the ground region;
Wiper motor with The bulge portion includes a lip portion that sandwiches and locks the terminal,
The wiper motor according to claim 4, wherein one end of the ground line is formed to be locked to the lip portion. 6. The wiper motor according to claim 5, wherein one end of the grounding line is deformed in a direction intersecting with an assembly direction of the housing cover with respect to the housing and contacts an inner surface of the lip portion. The wiper motor according to claim 5 or 6, wherein one end of the grounding line is bent so that a tip part contacts an inner surface of the lip part. The wiper motor according to claim 4 or 5, wherein one end of the ground line is formed so as to sandwich a side surface of the bulge portion. The bulge portion includes a protrusion,
The wiper motor according to claim 4, wherein one end of the ground line is formed so as to come into contact with a top portion and a side surface of the protruding portion. 10. The wiper motor according to claim 9, wherein one end of the ground line is formed so as to be in contact with a part of the top of the protrusion and a side surface of the one. The protrusion has a groove on the top,
11. The wiper motor according to claim 9, wherein one end of the ground line is formed so as to be in contact with a side surface portion of the groove portion.

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