JP6848474B2 - Motor device with shield structure - Google Patents

Description

The present invention relates to a motor device having a shield structure including a reduction gear portion and a connector portion, which can exert a good effect of improving EMC (electromagnetic compatibility) performance.

Many motor devices such as wipers, power windows, power seats, electric power steering, sun roofs, dual clutch transmissions, window washer fluid pumps, electric oil pumps, and electric power steering are used in vehicles. These motor devices are driven by a DC motor via reduction gears. Brushed motors and brushless motors are known as DC motors. Brushed motors are often used for wipers, power windows, power seats, sunroofs, etc. because they have particularly good startability and a large torque at the time of starting. Brushless motors are often used in dual clutch transmissions, window washer fluid pumps, electric oil pumps, electric power steering, etc. because of their good durability, quietness, and low vibration.

These motor devices are sources of electromagnetic noise. That is, in the brushed motor, since the direction of the current flowing through the armature of the rotor is controlled by the brush and the commutator, a large electromagnetic noise is generated in this portion. Further, in the brushless motor, since the current flowing through the winding of the stator core is controlled by the control circuit, a large electromagnetic noise is generated in the stator core, the winding and the control circuit. These electromagnetic noises are generated in frequencies ranging from low frequencies to GHz, and may adversely affect various electronic devices such as so-called smartphones, feature phones, tablet terminals, car navigation systems, AM radios, and FM radios. .. Therefore, various regulations are applied to the intensity of electromagnetic noise generated from the motor device, and the motor device is provided with various electromagnetic noise suppressing means, that is, means for improving EMC performance. In recent years, EMC measures in a higher frequency band have been required in order to support vehicle communication, automatic driving of vehicles, and smart keys.

For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 2007-20255), a substantially cylindrical end bracket member having a bottom surface and having one end opened, and a bottom surface portion covering the one end opening of the end bracket member are provided. In a motor in which a rotating shaft member of a brushed motor is rotatably held in a housing having a, a choke coil is formed as a means for improving EMC performance while forming a connector portion forming portion inside the peripheral wall portion of the end bracket member. And an example of providing a noise killer capacitor is shown.

Further, in Patent Document 2 (Japanese Unexamined Patent Publication No. 2008-271701), in a motor in which a part of a drive substrate is exposed from a notch formed on the outer periphery of the main body, a bottom lid attached to a bottom opening of the casing main body is used. , An example in which the bottom of the shield case and the side surface of the shield case are formed, and the opening formed between the side surface of the shield case and the outer circumference of the casing body is covered with the ceiling of the shield case to magnetically shield the EMC performance. It is shown.

JP-A-2007-202255 Japanese Unexamined Patent Publication No. 2008-271701

According to the motor disclosed in Patent Document 1, it is possible to reduce the electromagnetic noise generated in the wiring that feeds the brush by the choke coil and the noise killer capacitor, but it is possible to suppress the electromagnetic noise in all frequency bands. Have difficulty. Further, since the end bracket provided with the connector portion is made of resin, electromagnetic noise transmitted through the space generated inside the motor device leaks from this portion to the outside.

On the other hand, according to the motor disclosed in Patent Document 2, electromagnetic noise can be shielded in the portion shielded by the metal casing, but the connector portion is not covered with the metal member. It is not possible to suppress the electromagnetic noise generated from the metal terminals of the connector.

The motor disclosed in Patent Document 2 relates to a small motor not provided with a reduction gear, and the housing is metallized and shielded for such a small motor. It is easy to adopt. However, if the configuration of metallizing the housing and shielding it is applied as it is to a motor device for a vehicle that integrally has a reduction gear and a connector portion, the size of the reduction gear portion is compared with the size of the motor. Due to its large size and complicated outer shape, it takes time to assemble, so it is difficult to adopt it immediately. Therefore, in order to improve the EMC performance of a vehicle motor device that integrally includes a reduction gear and a connector portion, a shield is required at a portion other than the housing of the motor itself.

The present invention has been made to solve the above-mentioned problems of the prior art. That is, the present invention satisfactorily suppresses electromagnetic noise transmitted in the space generated inside the motor device to the EMC, for a motor device having a connector portion and an integral reduction gear, such as a motor for a vehicle. It is an object of the present invention to provide a motor device having a shielding function capable of improving performance and easily assembling this motor device.

The motor device provided with the shielding function of the first aspect of the present invention is
A motor body housed in a motor case and having a rotor with a rotating shaft,
A deceleration mechanism for decelerating the rotation of the rotating shaft,
The connector part connected to the power supply and
A power supply means connected to the connector portion for supplying power to the motor body, and
A housing that houses the speed reduction mechanism, the connector, and the power feeding means, and is coupled to the motor case.
In a motor device having a shield function
The housing is integrally formed of a metal member
The power feeding means and the connector portion are integrally formed of a resin member.
The housing has a bottomed box-shaped connector accommodating portion for accommodating the connector portion.
The housing has a bottomed box-shaped reduction mechanism accommodating portion for accommodating the deceleration mechanism portion and a bottomed box-shaped power feeding means accommodating portion for accommodating the power feeding means.
The bottom of the power feeding means accommodating portion is integrally coupled to the side wall of the deceleration mechanism accommodating portion.
A part of the bottom or outer wall of the connector accommodating portion is also used as a side wall of the power feeding means accommodating portion and is integrally coupled with the power feeding means accommodating portion.
The rotating shaft extends through the bottom portion of the power feeding means accommodating portion and the integrally coupled portion of the side wall of the deceleration mechanism accommodating portion to the deceleration mechanism portion.
The opening of the power feeding means accommodating portion is closed by the motor case .

In the motor device provided with the shield function of the first aspect of the present invention, the speed reduction mechanism portion, the connector portion, and the power feeding means are housed in a housing integrally formed of a metal member. Since the power feeding means and the connector portion, which are the sources of electromagnetic noise, are housed in a housing integrally formed of a metal member, according to the motor device having the shielding function of the first aspect of the present invention. Electromagnetic noise generated in the motor device is less likely to leak to the outside, and a motor device having a shield function having excellent EMC characteristics can be obtained.

Moreover, according to the motor device provided with the shield function of the first aspect of the present invention, the housing accommodating the reduction mechanism portion, the power feeding means, and the connector portion is integrally formed of a metal member. Since the housing can be manufactured by a die casting method using, for example, aluminum or an aluminum alloy, the housing can be easily manufactured and the number of assembly steps can be reduced.

Further, according to the motor device provided with the shield function of the first aspect of the present invention, the power feeding means and the connector portion are integrally formed of a resin member, and are integrally formed by, for example, insert molding with a resin material. Therefore, the manufacturing can be facilitated and the assembly man-hours can be reduced.

Further, according to the motor device provided with the shield function of the first aspect of the present invention, the connector portion which is a source of electromagnetic noise can be reliably accommodated by the bottomed box-shaped connector accommodating portion. The electromagnetic noise generated in the section is less likely to leak to the outside, and a motor device having a shield function having excellent EMC characteristics can be obtained.

Further, in the motor member having the shield function of the first aspect of the present invention, the opening side of the motor case of the motor body is provided so as to close the opening of the power feeding means accommodating portion via the flange. The motor case is made of a magnetic material such as iron. Further, the power feeding means accommodating portion is made of metal and has conductivity. Further, the power feeding means located on the opening side of the motor body is housed in the power feeding means accommodating portion and the closed space formed by the motor case. Therefore, in the motor member having the shield function of the first aspect of the present invention, the periphery of the power feeding means is shielded by the power feeding means accommodating portion and the motor case. Therefore, according to the motor member having the shielding function of the sixth aspect of the present invention, the electromagnetic noise generated in the motor member is less likely to leak to the outside by shielding the power feeding means which is the source of the electromagnetic noise. Therefore, a motor member having a shield function having excellent EMC characteristics can be obtained.

The motor device provided with the shield function of the second aspect of the present invention is
A motor body housed in a motor case and having a rotor with a rotating shaft,
A deceleration mechanism for decelerating the rotation of the rotating shaft,
The connector part connected to the power supply and
A power supply means connected to the connector portion for supplying power to the motor body, and
A housing that houses the speed reduction mechanism, the connector, and the power feeding means, and is coupled to the motor case.
In a motor device having a shield function
The power feeding means and the connector portion are integrally formed of a resin member.
The housing has a bottomed box-shaped connector accommodating portion for accommodating the connector portion.
The housing has a bottomed box-shaped reduction mechanism accommodating portion for accommodating the deceleration mechanism portion and a bottomed box-shaped power feeding means accommodating portion for accommodating the power feeding means.
The bottom of the power feeding means accommodating portion is integrally coupled to the side wall of the deceleration mechanism accommodating portion.
The rotating shaft extends through the bottom portion of the power feeding means accommodating portion and the integrally coupled portion of the side wall of the deceleration mechanism accommodating portion to the deceleration mechanism portion.
The opening of the power feeding means accommodating portion is closed by the motor case.
The housing is formed of a metal member, the connector accommodating portion is formed detachably, and the housing other than the connector accommodating portion is integrally formed.
A part of the bottom portion or the outer wall of the connector accommodating portion is also used as a side wall of the power feeding means accommodating portion and is coupled to the power feeding means accommodating portion .
According to the motor member having the shielding function of this aspect, the degree of freedom of the mold can be improved when the housing is manufactured by a die casting method using, for example, aluminum or an aluminum alloy. Moreover, since the power feeding means and the connector portion can be assembled with the connector accommodating portion removed, assembly is easy even if the power feeding means and the connector portion are integrally formed.

Further, the motor device having the shield function of the third aspect of the present invention is the motor device having the shield function of the first or second aspect, and the side wall of the connector accommodating portion is covered with at least the terminal of the connector portion. It is characterized by having a height to be obtained.

According to the motor device having the shielding function of this aspect, the periphery of the terminal of the connector portion can be reliably covered by the side wall of the connector accommodating portion, so that the electromagnetic noise generated at the terminal of the connector portion is less likely to leak to the outside. Therefore, a motor device having a shield function having excellent EMC characteristics can be obtained.

Further, the motor device having the shield function according to the fourth aspect of the present invention is the motor device having the shield function according to any one of the first to third aspects, and the connector accommodating portion is located at the bottom of the connector portion. It is characterized in that a protrusion that abuts on the bottom of the motor is provided.

When inserting an external connector into the connector part, if there is a gap between the bottom of the connector part and the bottom of the connector accommodating part, the connector part is pushed in the insertion direction of the external connector, so that the connector part and the power feeding means Stress is applied to the connection between the connector and the connector, which may cause deterioration such as cracking. According to the motor device provided with the shield function of the fifth aspect of the present invention, the protrusion at the bottom of the connector portion comes into contact with the bottom of the connector accommodating portion, so that the connection portion is not stressed and the connection portion is not stressed. No deterioration occurs.

Further, the motor device having the shield function of the fifth aspect of the present invention is the motor device having the shield function of any one of the first to fourth aspects, and the power feeding means is provided in the rotor. It is characterized by including a brush that supplies power to the commutator.

According to the motor device having the shield function of such an embodiment, a motor member having a shield function using a brushed motor as the motor main body can be obtained.

Further, the motor device having the shield function of the sixth aspect of the present invention is the motor device having the shield function of any one of the first to fifth aspects, and the power feeding means is the stator coil of the motor body. It is characterized by including means for energizing the motor.

According to the motor device having the shield function of this aspect, a motor member using, for example, a brushless motor as the motor main body can be obtained.

As described above, according to the motor device having the shield function of the present invention, the housing can be easily manufactured, and the electromagnetic noise generated in the motor device is less likely to leak to the outside, and the shield has excellent EMC characteristics. A motor device with a function can be obtained.

It is a front view of the motor device of Embodiment 1. It is a front side perspective view of the motor device of Embodiment 1. It is a rear side perspective view of the motor device of Embodiment 1. It is an exploded perspective view of the motor device of Embodiment 1. It is a vertical sectional view which shows the internal structure of the motor device of Embodiment 1. FIG. It is a vertical sectional view which shows the internal structure of the motor device of the modification 1. FIG. It is a front view of the motor device of the modification 2. It is a front view of the motor device of the modification 3. It is an exploded perspective view of the motor device of Embodiment 2. It is a vertical sectional view which shows the internal structure of the motor device of Embodiment 2. FIG. 11A is an enlarged perspective view showing a connector cover of a modified example of the second embodiment, and FIG. 11B is an enlarged plan view of the connector cover as well.

Hereinafter, a motor device having a shield function including a connector portion and a reduction gear portion according to the present invention will be described in detail using various embodiments. However, the various embodiments shown below will be described by taking a motor device for driving a power seat of a vehicle (automobile) as an example for embodying the technical idea of the present invention. It is not intended to be specified as shown in the embodiment of. The present invention can be equally applied not only to a motor device for driving a power seat of a vehicle, but also to a motor device having a shield function including other connector portions and reduction gear portions included in the claims.

[Embodiment 1]
A motor device having a shield function having a connector portion and a reduction gear portion according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is a front view of the motor device provided with the shield function of the first embodiment, FIG. 2 is a front perspective view, FIG. 3 is a rear perspective view, and FIG. 4 is an exploded view. It is a perspective view, and FIG. 5 is a vertical cross-sectional view also showing an internal structure.

As shown in FIGS. 1 to 3, the motor device 10A having the shield function of the first embodiment is adapted for driving a power seat (not shown) of a vehicle. The motor device 10A includes a motor main body 11, a reduction mechanism portion 20, a connector portion 30, a housing 50, and a cover 70.

As shown in FIG. 5, the motor body 11 is a DC motor with a brush capable of forward / reverse rotation, and includes a substantially bottomed cylindrical motor case 12 made of a soft magnetic material. The motor case 12 has a function as a stator yoke, and a plurality of, for example, four permanent magnets 13 are fixed to the inner peripheral surface of the motor case 12, and the plurality of permanent magnets 13 are the motor case. The magnetic poles are alternately arranged so as to be different along the circumferential direction of the twelve to form a four-pole stator field. The armature 14 forming a part of the rotor is rotatably housed in the motor case 12 so as to face the inner peripheral side of the permanent magnet 13. A rotation shaft 15 is fixed to the center of the armature 14, and the armature 14 rotates together with the rotation shaft 15. One end of the rotating shaft 15 in the axial direction is rotatably supported by a bearing at the bottom 16 of the motor case 12. The other end side of the rotating shaft 15 in the axial direction extends to the speed reduction mechanism portion 20, and a worm 22 is provided at the tip thereof. The tip side and the motor body side of the worm 22 are rotatably supported by bearings, respectively.

A commutator 18 (see FIG. 4) is fixed to the other end of the armature 14 of the rotating shaft 15 in the axial direction, and the commutator 18 rotates together with the rotating shaft 15. The commutator 18 is electrically connected to an armature coil wound around a magnetic pole of the armature 14. The brush holder 17 is arranged so as to cover the periphery of the commutator 18, and is formed in a substantially annular shape. The brush holder 17 is provided with a plurality of brushes (not shown) on the inner surface side, and the plurality of brushes are brought into contact with the commutator 18 of the armature 14 so as to be slidable to supply power to the commitator 18. Here, the brush holder 17 is included in the "power feeding means". Further, it is desirable that the brush holder 17 is provided with a choke coil or a noise killer capacitor that is electrically connected to the brush as a means for improving EMC performance.

As will be described later, the connector portion 30 is located on the outer peripheral side of the brush holder 17, at a position substantially parallel to the direction perpendicular to the axial center of the helical gear 25, and on the side opposite to the worm 22 provided. It is provided integrally with the brush holder 17. An external connection plug (not shown) for electrically connecting to a control device (not shown) for controlling the rotation of the motor body 11 is inserted into the connector portion 30. It is also possible to house the control device inside the housing 50. In this case, in addition to the power supply, a signal line from a sensor or the like is connected to the connector portion 30 as needed. A terminal 31 connected to a plug for external connection is provided inside the connector portion 30, and the other end of the conductive member 32 whose one end is electrically connected to the brush holder 17 is electrically connected to this terminal 31. Is connected. As will be described later, the terminal 31 and the conductive member 32 may be integrally formed. In the motor device 10A having the shield function of the first embodiment, the opening direction of the plug insertion port 33 into which the plug for external connection is inserted in the connector portion 30 is substantially the extending direction of the rotating shaft 15 of the motor body 11. It is provided in parallel and in a direction facing the motor body 11 side.

The speed reduction mechanism unit 20 is connected to the motor body 11 to reduce the rotation of the motor body 11, and here, the first and second speed reduction mechanisms 21a and 21b, the housing 50, and the cover 70 are used. It is configured. The housing 50 is manufactured by a die-casting method using, for example, aluminum or an aluminum alloy, and has a speed reduction mechanism accommodating portion 51, a power feeding means accommodating portion 52, and a connector accommodating portion 53. .. The reduction mechanism accommodating portion 51 has a bottomed box shape and opens toward the axial direction of the helical gear 25, and accommodates the first and second deceleration mechanisms 21a and 21b therein, which will be described later. It is blocked by the cover 70 of the. Further, as shown in FIGS. 4 and 5, a worm 22 forming a part of the deceleration mechanism portion 20 is rotatably mounted in the deceleration mechanism portion accommodating portion 51.

The power feeding means accommodating portion 52 has a bottomed box shape, the bottom portion is integrally connected to the outer wall of the speed reduction mechanism accommodating portion 51, the motor body 11 side is open, and the brush holder 17 as the power feeding means is provided. It is housed and this opening is closed by a motor case 12 and a flange 12a, as will be described later.

The connector accommodating portion 53 has a bottomed box shape, and a part of the outer wall thereof is also used as the outer wall of the power feeding means accommodating portion 52 and is integrally coupled with the power feeding means accommodating portion 52. The connector accommodating portion 53 has an opening on the motor main body side in a direction substantially parallel to the axis of the rotating shaft 15 of the motor main body 11, and the connector accommodating portion 30 is accommodated inside the opening. As will be described later, the connector portion 30 is connected to an external power supply by inserting a plug for external connection from the opening side.

That is, the speed reduction mechanism accommodating portion 51, the power feeding means accommodating portion 52, and the connector accommodating portion 53 are all a single metal member integrally formed of a conductive material, and also function as a shield member. The housing 50 is grounded by being body-grounded by the vehicle.

The first deceleration mechanism 21a is composed of a combination of the worm 22 and the worm wheel 23. The other end side of the rotating shaft 15 of the motor body 11 is passed through the inside of the brush holder 17 and extends into the reduction mechanism portion 20, and the worm 22 is attached to the other end side of the rotating shaft 15. The worm wheel 23 is formed in a substantially disk shape, and the worm 22 meshes with the outer peripheral portion of the worm wheel 23.

The second reduction mechanism comprises a combination of a first helical gear 24 integrated with the worm wheel 23 and a second helical gear 25 that meshes with the first helical gear 24. The center of the first helical gear 24 is rotatably mounted in the reduction mechanism accommodating portion 51 by a pin 26. The second helical gear 25 has an opening 27 in which, for example, a power seat drive shaft (not shown) is inserted and fixed in the center, and a reduction mechanism accommodating portion 51 into which the power seat drive shaft is also inserted. It is arranged so as to be coaxial with the opening 54 of the cover 70 and the opening 71 of the cover 70.

As a result, the rotation of the armature 14 in the motor body 11 is decelerated to the second helical gear 25 via the rotating shaft 15, the worm 22, the worm wheel 23, and the first helical gear 24 at a predetermined reduction ratio, and the second The drive shaft (not shown) of the power seat fixed to the opening 27 of the helical gear 25 is driven at a predetermined rotational speed.

The cover 70 is made of synthetic resin here, and is provided by a plurality of screws 72 with the first deceleration mechanism 21a and the second deceleration mechanism 21b arranged between the cover 70 and the deceleration mechanism accommodating portion 51. It is fixed so as to cover the open end of the bottom box-shaped reduction mechanism accommodating portion 51.

Further, the brush holder 17 and the connector portion 30 are integrally connected by a thin plate-shaped synthetic resin bridge portion 34 arranged on the motor body 11 side. A conductive member 32 that electrically connects the brush holder 17 and the terminal 31 of the connector portion 30 is also integrally formed with the bridge portion 34 by, for example, insert molding. The conductive member 32 is, for example, a bus bar formed of a copper plate, and the end portion of the conductive member 32 on the brush holder 17 side is electrically connected to the brush, and the end portion of the conductive member 32 on the connector portion 30 side is connected. The terminal 31 is integrally molded with the conductive member 32. The terminal 31 is raised from the conductive member 32 in a substantially vertical direction toward the opening side of the connector accommodating portion 53 substantially parallel to the axial direction of the motor body. The connector portion 30 has a bottomed box shape, and the bottom portion is formed to be substantially rectangular. The conductive member 32 includes a bridge portion 34, a portion of the side wall of the connector portion 30 on the side of the power feeding means accommodating portion 52, and a connector. It is embedded in the molding resin at the bottom of the portion 30. Then, the terminal 31 projects from the molding resin at the bottom of the connector portion 30 substantially perpendicularly to the bottom of the connector portion 30 toward the opening side of the connector accommodating portion 53 inside the side wall of the connector portion. The distance from the bottom of the connector portion 30 on the side wall of the connector portion 30 to the opening of the connector portion 30 is set to be longer than the distance from the bottom of the connector portion 30 to the tip of the terminal 31 by a predetermined dimension. .. That is, the terminal 31 is raised from the bottom to the opening side inside the side wall so as to be covered by the side wall of the connector portion 30.

The connector accommodating portion 53 in which the connector portion 30 is housed has a bottomed box-like shape having a substantially rectangular bottom so as to correspond to the shape of the connector portion 30, and the connector portion 30 is inserted from the opening side. As a result, the connector portion 30 is accommodated. When the connector portion 30 is accommodated in the connector accommodating portion 53, a part of the side wall of the connector portion 30 projects to the opening side of the connector accommodating portion 53 by a predetermined length. This facilitates the work of inserting the plug for external connection into the connector portion 30.

Further, in the state where the connector portion 30 is accommodated in the connector accommodating portion 53, the distance from the bottom portion of the connector accommodating portion 53 on the side wall of the connector accommodating portion 53 to the opening of the connector accommodating portion 53 is the distance from the bottom portion of the connector accommodating portion 53 to the tip of the terminal 31. It is set to be longer than the distance to by a predetermined dimension. As a result, the terminal 31 is covered with the side wall of the connector accommodating portion 53 made of conductive metal, so that the electromagnetic noise generated at the terminal 31 can be shielded.

If there is a gap between the bottom of the connector housing 53 and the bottom of the connector 30 while the connector 30 is housed in the connector housing 53, when the plug for external connection is inserted into the connector 30, when the plug for external connection is inserted into the connector 30. Around the connection portion between the bridge portion 34 and the connector portion 30, stress is generated in the direction in which the bottom portion of the connector portion 30 approaches the connector accommodating portion 53, and this stress causes a crack around the connection portion between the bridge portion 34 and the connector portion 30. There is a risk of deterioration such as. Therefore, a plurality of connector portion protrusions 35 are provided on the outside of the bottom portion of the connector portion 30 (the side facing the connector accommodating portion 53), and the connector portion protrusions 35 are provided on the inner surface side of the bottom portion of the connector accommodating portion 53. Since it is configured to be in contact with each other, it is possible to eliminate the occurrence of stress around the connection portion between the bridge portion 34 and the connector portion 30 when the plug for external connection is inserted into the connector portion 30.

Since the brush holder 17, the connector portion 30, and the bridge portion 34 are all molded as a single member by, for example, injection molding using a synthetic resin material, they can be easily molded. As a result, since the brush holder 17, the connector portion 30, and the bridge portion 34 are integrated, the brush holder 17 and the connector portion 30 can be inserted from the opening sides of the power feeding means accommodating portion 52 and the connector accommodating portion 53, respectively. Since it can be assembled, it is easy to assemble and the number of assembly steps can be reduced.

Next, the operation and effect of the motor device 10A having the shield function according to the first embodiment of the present invention will be described.

When an external connection plug (not shown) for electrically connecting to a control device (not shown) for controlling the rotation of the motor body 11 is inserted into the terminal 31 of the connector part 30, the connector part 30 When the rotating shaft 15 of the motor body 11 is rotated in a predetermined direction, a current in the forward direction is applied to the terminal 31, and when the rotating shaft 15 of the motor body 11 is rotated in the direction opposite to the predetermined direction, a current in the opposite direction is applied to the terminal 31. It is supplied from the control device. When the control device performs pulse width modulation (PWM) control, the control device supplies the terminal 31 with a duty drive voltage corresponding to the rotation speed of the rotation shaft 15 of the motor body 11. That is, the control device increases the duty of the drive voltage when increasing the rotation speed of the rotation shaft 15 of the motor body 11, and decreases the duty of the drive voltage when decreasing the rotation speed of the rotation shaft 15 of the motor body 11.

The current input to the terminal 31 is supplied to the commutator 18 of the motor body 11 by the brush provided in the brush holder 17, which is a power feeding means, through the conductive member 32 of the bridge portion 34. Since the commutator 18 is electrically connected to the armature coil wound around the magnetic pole of the armature 14, when a current is supplied to the armature 18, a current flows through the armature coil and the magnetic pole of the armature 14 is excited. The magnetic pole of the armature 14 magnetically attracts and repels the stator field, so that the armature 14 rotates. The rotation of the armature 14 is transmitted to the worm 22 via the rotation shaft 15 and further transmitted to the worm wheel 23 meshing with the worm 22 to reduce the speed at a predetermined reduction ratio. Further, the worm wheel 23 is decelerated at a predetermined reduction ratio by being transmitted to the helical gear 25 meshing with the helical gear 24 via the helical gear 24 formed coaxially with the worm wheel 23, and the deceleration is reduced. The rotation is transmitted to the drive shaft of the power seat inserted and fixed in the opening 27 of the helical gear 25. The power seat is driven by the rotation transmitted to the drive shaft of the power seat.

When power is supplied to the commutator 18 of the motor body 11 by the brush provided in the brush holder 17 which is the power feeding means, a large electromagnetic noise is generated because the brush is in sliding contact with the commutator 18. When a choke coil or a noise killer capacitor is electrically connected to the brush as a means for improving EMC performance, the brush holder 17 can reduce the generation of electromagnetic noise to some extent, but all of them. It is not possible to suppress electromagnetic noise in the frequency band.

In the motor device 10A having the shield function of the first embodiment, the brush holder 17 as the power feeding means that is the source of electromagnetic noise is the power feeding means accommodating portion 52 of the conductive metal housing 50 and the motor case made of magnetic material. Since it is housed by the 12 and the flange 12a, the electromagnetic noise generated in the brush holder 17 is shielded. Further, the motor case 12 of the motor main body 11 is formed with a flange 12a which is the same member as the motor case 12 and extends outward on the opening side, and the flange 12a is an opening portion of the power feeding means accommodating portion 52 by a plurality of screws 19. It is installed so as to cover. As a result, the housing 50 made of the conductive material covers one surface side of the deceleration mechanism portion 20 by the deceleration mechanism portion accommodating portion 51, and covers the outer peripheral side of the brush holder 17 as the power feeding means by the power feeding means accommodating portion 52. , The connector accommodating portion 53 covers the outer peripheral side of the connector portion. As described above, since the open end of the power feeding means accommodating portion 52 is covered by the motor case 12 of the motor body 11 and the flange portion 12a thereof, the brush holder 17 as the power feeding means that is a source of electromagnetic noise. The periphery of the internal space of the motor body 11 in which the motor body 11 is arranged is covered with a conductive member and shielded.

The brush holder 17 as a power feeding means that is a source of electromagnetic noise includes a feeding means accommodating portion 52 of a housing 50 made of a conductive metal, for example, aluminum or an aluminum alloy, and a motor case 12 and a flange 12a made of a magnetic material, for example, iron. Shielded by. Here, since the housing 50 is a member having a large volume in which the reduction mechanism accommodating portion 51, the power feeding means accommodating portion 52, and the connector accommodating portion 53 are integrally molded, it acts like a large capacitor and increases the capacitance. It can be made larger. Further, since the motor case 12 also has conductivity, the capacitance can be further increased. For this reason, when the housing 50 of the motor device 10A having the shield function of the first embodiment of the present invention is used, the absorption capacity of electromagnetic noise is high and the EMC performance is high.

Electromagnetic noise is also generated from the terminal 31 of the connector portion 30, but since the terminal 31 has a bottomed box shape and the bottom portion is covered with the connector accommodating portion 53 having a substantially rectangular shape, this electromagnetic noise is shielded. Moreover, the distance from the bottom of the connector portion 30 on the side wall of the connector portion 30 to the opening of the connector portion 30 is set to be longer than the distance from the bottom portion of the connector portion 30 to the tip of the terminal 31 by a predetermined dimension. ing. That is, since the terminal 31 is raised from the bottom to the opening side inside the side wall so as to be covered by the side wall of the connector portion 30, the EMC performance can be further improved.

Moreover, since the housing 50 is integrally molded with the speed reduction mechanism accommodating portion 51, the power feeding means accommodating portion 52, and the connector accommodating portion 53, only one mold is required when molding by die casting or the like. Is easy. Further, when the housing 50 is integrally molded, the number of parts is reduced, so that assembly is easy and the assembly man-hours can be reduced. Further, since the brush holder 17, the connector portion 30, and the bridge portion 34 are integrally molded by, for example, injection molding using a synthetic resin material, they can be easily molded and the number of parts can be reduced. .. As a result, the brush holder 17 and the connector portion 30 can be assembled by inserting the brush holder 17 and the connector portion 30 from the opening side of the power feeding means accommodating portion 52 and the connector accommodating portion 53, respectively. Can also be reduced.

As a result, according to the motor device 10A having the shield function of the first embodiment, the internal space of the motor body 11 is electromagnetically shielded in substantially all directions. The electromagnetic noise propagating in the generated space can also be effectively suppressed, and the EMC performance becomes very good. In addition, the speed reduction mechanism accommodating portion 51, the power feeding means accommodating portion 52, and the connector accommodating portion 53 are all integrally formed of a conductive material, which facilitates manufacturing.

[Modification 1]
Although the motor device 10A having the shield function of the first embodiment shows an example in which a brushed motor is used as the motor main body 11, a brushless motor can also be used. A modified example of the first embodiment using such a brushless motor will be described with reference to FIG. Note that FIG. 6 is a vertical cross-sectional view of the motor device having the shield function of the modified example of the first embodiment, and in FIG. 6, the same components as the motor device 10A of the first embodiment shown in FIGS. 1 to 5. The same reference numerals are given to the above, and detailed description thereof will be omitted.

The configuration of the motor device 10B having the shield function of this modification is different from that of the motor device 10A having the shield function of the first embodiment in that the motor body 11a is a brushless motor. Therefore, the motor body 11a in the motor device 10B having the shield function of the modified example includes a permanent magnet 13, an armature 14, a commutator 18, and a commutator attached to the inside of the motor case 12 provided in the motor body 11 of the first embodiment. It does not have a brush holder 17 with a brush that slides on 18. Instead, the motor body 11a of the modified example is provided with a rotor 14a having, for example, a 4-pole permanent magnet on the outer peripheral surface of the rotating shaft 15, and a stator core having a plurality of magnetic poles on the inner peripheral side inside the motor case 12. 13a is provided, a stator coil is wound around each magnetic pole of the stator core 13a, and a control circuit 17a for energizing the stator coil is provided. The control circuit 17a is arranged in a portion of the motor device 10A where the brush holder 17 is provided. The control circuit 17a is included in the "power feeding means".

The control circuit 17a is electrically connected to the terminal 31 of the connector portion 30 via the conductive member 32 of the bridge portion 34, and power is supplied from the terminal 31. The output current of the control circuit is supplied to the stator coil, for example, which is centrally wound around the magnetic poles of the stator core 13a via the conductive member 32a. A Hall element as a position detecting means is fixed to the circuit board so as to face the axial end surface of the permanent magnet of the rotor 14a. The position detection means is not limited to the Hall element, and any magnetic detection element such as a Hall IC, a magnetoresistive element, or an MR sensor may be used. The control circuit 17a switches the phase for exciting the stator coil of each magnetic pole of the stator core 13a according to the position of the field by the permanent magnet of the rotor 14a detected by the position detecting means. The magnetic poles of the stator core 13a are composed of, for example, three-phase and six poles, and power elements (not shown) such as six field effect transistors (hereinafter referred to as FETs) constituting, for example, a three-phase bridge circuit are mounted on the control circuit 17a. The control circuit 17a controls the rotation direction and rotation speed of the rotor 14a by controlling the energization of the stator coils of the magnetic poles of the stator core 13a by a three-phase bridge circuit.

In the motor device 10B having a shield function of a modified example of such a configuration, since there is no brush and commutator, it is unlikely that large electromagnetic noise like a brushed motor is generated, but in the control circuit 17a, switching by a power element is performed. Since the control is performed, electromagnetic noise due to switching noise is generated. The control circuit 17a as the power feeding means, which is a source of electromagnetic noise, is composed of the power feeding means accommodating portion 52 of the housing 50, the motor case 12, and the flange 12a, similarly to the motor device 10A provided with the brushed motor body 11 of the first embodiment. Since it is accommodated, the electromagnetic noise generated from the control circuit 17a is shielded. Moreover, in the modified example motor device 10B, the shield structure is substantially the same as that of the motor device 10A provided with the brushed motor 11 of the first embodiment, so that a difference in dynamic characteristics occurs due to a difference in the configuration of the motor body. Even if there is, the EMC performance is better than that of the motor device 10A having a shield function including the brushed motor body 11 of the first embodiment.

[Modifications 2 and 3]
The motor device 10C of the second modification of the first embodiment will be described with reference to FIG. 7, and the motor device 10D of the third modification will be described with reference to FIG. 7 is a front view of the motor device of the modified example 2, and FIG. 8 is a front view of the motor device of the modified example 3. Further, in FIGS. 7 and 8, the same reference numerals are given to the same components as the motor device 10A of the first embodiment shown in FIGS. 1 to 5, and detailed description thereof will be omitted.

In the motor device 10A having the shield function of the first embodiment, the plug insertion port 33 of the connector portion 30 is provided so as to be substantially parallel to the extending direction of the rotation shaft 15 of the motor body 11. On the other hand, in the motor device 10C having the shield function of the second modification, the plug insertion port 33a of the connector portion 30a is substantially perpendicular to the extending direction of the rotation shaft 15 of the motor body 11, and is upward in the front view. It is arranged so that it faces. Further, in the motor device 10D having the shield function of the modified example 3, the plug insertion port 33b of the connector portion 30b is substantially perpendicular to the extending direction of the rotation shaft 15 of the motor body 11, but is directed toward the front view. It is arranged like this.

That is, the motor device 10A having the shield function of the first embodiment, the motor device 10C having the shield function of the modified example 2, and the motor device 10D having the shield function of the modified example 3 are plugs of connector portions, respectively. The directions in which the insertion ports 33, 33a, and 33b face are three-dimensionally rotated by 90 °. The directions in which the plug insertion ports 33, 33a, and 33b face may be appropriately determined according to the application of each motor device. Even in the motor devices 10C and 10D having the shield function of the modifications 2 and 3, substantially the same EMC performance and manufacturing ease as those of the motor device 10A having the shield function of the first embodiment are ensured. can do.

[Embodiment 2]
The motor device 10E of the second embodiment will be described with reference to FIGS. 9 and 10. 9 is an exploded perspective view of the motor device of the second embodiment, and FIG. 10 is a vertical cross-sectional view showing the internal structure of the motor device of the second embodiment. Further, in FIGS. 9 and 10, the same reference numerals are given to the same components as the motor device 10A of the first embodiment shown in FIGS. 1 to 5, and detailed description thereof will be omitted.

The housing 50 in the motor device 10A of the first embodiment is configured to simultaneously cover the outer peripheral side of the brush holder 17 and the connector portion 30. Therefore, the housing 50 has a complicated structure in combination with the reduction mechanism accommodating portion 51, the power feeding means accommodating portion 52, and the connector accommodating portion 53, and can be produced at once by the die casting method. Although it can be done, there is a risk that defective products will occur during manufacturing.

Therefore, the motor device 10E provided with the shield function of the second embodiment has substantially the same improved EMC performance as the motor device 10A of the first embodiment, with a partial configuration of the connector accommodating portion 53 as a separate configuration. It is intended to be effective and easy to manufacture.

The configuration of the motor device 10E having the shield function of the second embodiment is different from that of the motor device 10A having the shield function of the first embodiment, that the connector accommodating portion 53 can be attached to and detached from the outer wall of the power feeding means accommodating portion 52. It is a point formed by a connector cover 55 formed of a four-sided wall member in which a portion facing the plug insertion port 33 side of the connector portion 30 and the power feeding means accommodating portion 52 is formed. The connector cover 55 is formed by a die casting method, a press working method, or the like using a conductive metal such as aluminum or an aluminum alloy as a material.

The connector cover 55 made of the four-sided wall member according to the second embodiment is formed with a plurality of fitting projections 56 on the outer wall side of the power feeding means accommodating portion 52, and is formed on the outer wall of the feeding means accommodating portion 52. Is formed with a plurality of grooves 56 into which the fitting protrusions 56 are fitted at positions facing the fitting protrusions 56. In this state, when a plurality of fitting protrusions 46 of the connector cover 55 are inserted into the grooves 57 formed in the outer wall of the power feeding means accommodating portion 52 and fitted, a part of the outer wall of the feeding means accommodating portion 52 is formed. Formes the inner wall 53a of the connector accommodating portion 53, and has substantially the same configuration as the connector accommodating portion 53 of the first embodiment. In addition, instead of inserting only the fitting projection 46 into the groove 57, the fitting projection 46 is substantially parallel to the axial direction of the motor body in the feeding means accommodating portion 52 in the four-sided wall member of the connector cover 55 in the groove 57. It is also possible to insert the pair of sides facing the power feeding means accommodating portion 52 of the pair of side walls facing each other into the groove 57. In this case, it is desirable that the portion of the groove 57 corresponding to the fitting protrusion 46 is a deep groove that matches the shape of the fitting protrusion 46. As a result, the connector cover 55 comes into contact with the power feeding means accommodating portion 52 substantially on the entire pair of sides, the potential of the connector cover 55 becomes more stable, and the EMC performance of the connector portion 30 with respect to the terminal 31 can be further improved. it can.

According to the motor device having the shielding function of this aspect, the plurality of fitting projections 56 of the connector cover 55 made of the four-sided wall member are simply fitted into the plurality of grooves 57 formed in the power feeding means accommodating portion 52. Therefore, the connector cover 55 made of the four-sided wall member and the power feeding means accommodating portion 52 can be integrated to form the connector accommodating portion 53. Further, the connector cover 55 can be separated from the power feeding means accommodating portion 52 only by pulling out the connector cover 55 made of the four-sided wall member.

As a result, according to the motor device 10E having the shield function of the second embodiment, the brush holder 17 or the bearing portion 17b and the connector in a state where the connector cover 55 made of the four-sided wall member is removed from the outer wall of the power feeding means accommodating portion 52. Since the portion 30 can be assembled, even if the brush holder 17 or the bearing portion 17b is integrally formed, the assembly becomes easy. Moreover, since the connector cover 55 is electrically connected to the outer wall of the power feeding means accommodating portion 52, it is possible to exhibit the same EMC performance as the motor device 10A of the first embodiment.

[Modification example]
A modified example of the motor device 10E having the shield function of the second embodiment will be described with reference to FIG.
In the motor device 10E having the shield function of the second embodiment, the connector accommodating portion 53 is formed with the fitting projection 56 of the connector cover 55 made of a four-sided wall member on the outer wall side of the power feeding means accommodating portion 52. The connector accommodating portion 53 is formed by fitting the connector into the connector 53. However, when such a motor device 10E is used for a member having a large vibration such as a vehicle, the fitting projection 56 of the connector cover 55 may come off from the groove 57 formed in the power feeding means accommodating portion 52. .. Therefore, in the modified example of the motor device 10E having the shield function of the second embodiment, a plurality of grooves formed on the outer wall side of the fitting projection 56 of the connector cover 55 made of a four-sided wall member and the power feeding means accommodating portion 52. It is designed so that it can be firmly bonded to 57.

That is, notches 58 are formed in the fitting protrusions 56a on the two opposite sides of the connector cover 55a made of the four-sided wall member of the modified example in a direction intersecting the protruding direction of the fitting protrusions 56a and in the same direction. At the same time, an engaging portion (not shown) with respect to the notch of the fitting protrusion is formed in the groove 57. The configuration of such an engaging portion is not shown because it is well known, but for example, it is a rod-shaped member formed so as to cross between the side walls of the groove 57, and has a notch 58 inside the groove 57. For example, forming a recess corresponding to the shape of the fitting protrusion 56a.

In a motor device having a shielding function of a modified example having such a configuration, a plurality of facing fitting projections 56a of a connector cover 55a made of a four-sided wall member are formed in a plurality of grooves formed in a power feeding means accommodating portion 52. Opposite to the motor body 11 so that after fitting, the notches formed in the fitting protrusions on the two opposite sides of the connector cover 55a engage with the engaging portion formed in the power feeding means accommodating portion 52. Slide to the side. In this state, when the flange 12a of the motor case 12 is covered from the motor body 11 side so as to close the opening of the power feeding means accommodating portion 52 of the housing 50, the flange 12a fits the connector cover 55a on the two opposite sides of the connector cover 55a. The notch formed in the protrusion 56a is pressed in the direction of engaging with the engaging portion formed in the power feeding means accommodating portion 52, and the fitting protrusion 56a is configured to be prevented from coming off from the groove 57. As a result, the connector cover 55a and the power feeding means accommodating portion 52 can be firmly integrated to form the connector accommodating portion 53.
In order to separate the connector cover 55a from the power feeding means accommodating portion 52, the connector cover 55a is slid in a direction away from the notch formed in the fitting projection of the feeding means accommodating portion 52, and then the connector cover 55a is moved. Since it can be removed by simply pulling it out, it is easy to assemble and disassemble.

[Embodiment 3]
The housing 50 is synthesized in that the motor device having the shield function of the third embodiment is different from the motor devices 10A to 10D having the shield function of the first embodiment or the motor device 10E having the shield function of the second embodiment. It is integrally molded by injection molding or the like using a resin as a material, and the surface of the molded resin is plated with a conductive metal. Even when the material of the housing 50 is not a conductive metal but a synthetic resin, the surface of the molding resin is plated with the conductive metal to provide a brush holder 17 as a power feeding means that is a source of electromagnetic noise and a control. Since the circuit 17a and the like are shielded by the conductive metal, the electromagnetic noise generated in the brush holder 17 and the control circuit 17a and the like is shielded. Further, electromagnetic noise is also generated from the terminal 31 of the connector portion 30, but since the terminal 31 is covered by the connector accommodating portion 53 of the housing 50 which is also plated with the conductive metal, this electromagnetic noise is shielded. Has been done. Further, since the housing 50 is integrally molded by injection molding or the like using a synthetic resin as a material, it is easy to manufacture, and the manufacturing cost is reduced as compared with manufacturing by a die casting method using, for example, aluminum or an aluminum alloy. can do.

10A-10E: Motor device with shield function 11, 11a: Motor body 12: Motor case 12a: Flange 13: Permanent magnet 13a: Motor winding 14: Armature 14a: Rotor 15: Rotating shaft 16: Bottom 17: Brush holder 17a: Control circuit 18: Commitator 19: Screw 20: Deceleration mechanism 21a, 21b: Deceleration mechanism 22: Worm 23: Worm wheel 24, 25: Helical gear 26: Pin 27: Opening 30, 30a, 30b: Connector portion 31, 31b: Terminals 32, 32a: Conductive members 33, 33a, 33b: Plug insertion port 34: Bridge part Connector part protrusion 35 50: Housing 51: Speed reduction mechanism part housing part 52: Power supply means housing part 53: Connector housing part 53b: Inner wall 54: Opening
55, 55a: Connector cover (four-sided wall member) 56, 56a: Fitting protrusion 57: Groove 58: Notch 70: Cover 71: Opening 72: Screw

Claims (6)

A motor body housed in a motor case and having a rotor with a rotating shaft,
A deceleration mechanism for decelerating the rotation of the rotating shaft,
The connector part connected to the power supply and
A power supply means connected to the connector portion for supplying power to the motor body, and
A housing that houses the speed reduction mechanism, the connector, and the power feeding means, and is coupled to the motor case.
In a motor device having a shield function
The housing is integrally formed of a metal member
The power feeding means and the connector portion are integrally formed of a resin member.
The housing has a bottomed box-shaped connector accommodating portion for accommodating the connector portion.
The housing has a bottomed box-shaped reduction mechanism accommodating portion for accommodating the deceleration mechanism portion and a bottomed box-shaped power feeding means accommodating portion for accommodating the power feeding means.
The bottom of the power feeding means accommodating portion is integrally coupled to the side wall of the deceleration mechanism accommodating portion.
A part of the bottom or outer wall of the connector accommodating portion is also used as a side wall of the power feeding means accommodating portion and is integrally coupled with the power feeding means accommodating portion.
The rotating shaft extends through the bottom portion of the power feeding means accommodating portion and the integrally coupled portion of the side wall of the deceleration mechanism accommodating portion to the deceleration mechanism portion.
A motor device having a shield function , wherein the opening of the power feeding means accommodating portion is closed by the motor case. A motor body housed in a motor case and having a rotor with a rotating shaft,
A deceleration mechanism for decelerating the rotation of the rotating shaft,
The connector part connected to the power supply and
A power supply means connected to the connector portion for supplying power to the motor body, and
A housing that houses the speed reduction mechanism, the connector, and the power feeding means, and is coupled to the motor case.
In a motor device having a shield function
The power feeding means and the connector portion are integrally formed of a resin member.
The housing has a bottomed box-shaped connector accommodating portion for accommodating the connector portion.
The housing has a bottomed box-shaped reduction mechanism accommodating portion for accommodating the deceleration mechanism portion and a bottomed box-shaped power feeding means accommodating portion for accommodating the power feeding means.
The bottom of the power feeding means accommodating portion is integrally coupled to the side wall of the deceleration mechanism accommodating portion.
The rotating shaft extends through the bottom portion of the power feeding means accommodating portion and the integrally coupled portion of the side wall of the deceleration mechanism accommodating portion to the deceleration mechanism portion.
The opening of the power feeding means accommodating portion is closed by the motor case.
The housing is formed of a metal member, the connector accommodating portion is formed detachably, and the housing other than the connector accommodating portion is integrally formed.
A motor device having a shield function, characterized in that a bottom portion or a part of an outer wall of the connector accommodating portion is also used as a side wall of the power feeding means accommodating portion and is coupled to the power feeding means accommodating portion. The motor device having a shield function according to claim 1 or 2 , wherein the side wall of the connector accommodating portion has at least a height at which the terminals of the connector portion are covered. The motor device having a shield function according to any one of claims 1 to 3, wherein the bottom portion of the connector portion is provided with a protrusion that abuts on the bottom portion of the connector accommodating portion. The motor device having a shield function according to any one of claims 1 to 4 , wherein the power feeding means includes a brush that supplies power to a commutator provided in the rotor. The motor device having a shield function according to any one of claims 1 to 5 , wherein the power feeding means includes means for energizing the stator coil of the motor body.

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