JP6780857B2 - DC motor - Google Patents

Description

The present invention relates to a DC motor in which rotating shafts protruding from both ends of the rotor are supported by bearing members.

Among the DC motors, as described in Patent Document 1, a bearing holding portion formed on one end surface of the motor case and a bearing holding portion formed on an end frame that closes the other end surface of the motor case. In addition, a sliding bearing is accommodated, and both sliding bearings support a rotating shaft protruding from both ends of the rotor. For example, as described in Patent Document 2, a load side (driving) protruding from one end of the rotor. The rotating shaft (motor shaft in Patent Document 2) (on the shaft side) is supported by a ball bearing (ball bearing in Patent Document 2) housed in a bearing holding portion (bearing accommodating portion in Patent Document 2) on one side surface of the motor case. , A sliding bearing in which the rotation shaft on the counterload side (rectifier side) protruding from the other end of the rotor is housed in the bearing holding portion of the end plate that closes the other side surface of the motor case (sintered oil-impregnated bearing in Patent Document 2). There is something supported by.

JP-A-2007-282441 JP-A-2007-252130

As described in Patent Document 1, in a DC motor in which a rotating shaft protruding from both ends of a rotor is supported by a slide bearing, the slide bearing has a small load capacity and durability due to wear. Due to the problems, it is not suitable for applications where a relatively large radial load acts on the rotating shaft.

On the other hand, in the DC motor described in Patent Document 2, the rotating shaft on the opposite side of the rectifier on the driving shaft side is supported by a ball bearing having a large load capacity, so that the rotating shaft on the driving shaft side It can also be used for applications where a large radial load acts.

However, for example, when a DC motor is used as a drive source for a throttle valve of an automobile engine or an actuator that opens and closes a trunk lid or a back door, the installation space, waterproofness due to the arrangement of the drive source, arrangement of the power supply cable, etc. From the viewpoint, there are cases where it is desired to select a rotation axis on the drive axis side, such as using the rotation axis on the commutator side as the drive axis or the rotation axis on the opposite side of the commutator as the drive axis. In the DC motor described in the above, such a change cannot be easily made for the following reasons.

That is, in the DC motor described in Patent Document 2, the inner and outer diameters of the bearing holding portions formed on the motor case and the end plate are different in size, and ball bearings having different outer diameters are used. And contains sleeve bearings.

Therefore, each bearing holder is dedicated to the ball bearing and the sleeve bearing, and it is not possible to easily change the sleeve bearing to the ball bearing and the ball bearing to the sleeve bearing by exchanging them, and the rectifier side. Even if you want to use ball bearings with the same outer diameter as the drive shaft, you cannot do that, and the rotation shaft on the drive shaft side is fixed to the one on the opposite side of the rectifier. It ends up.

To deal with this problem, a small-diameter ball bearing is prepared separately, and this ball bearing is housed in a bearing holder for a sleeve bearing with a small inner and outer diameter, and the rotation shaft on the rectifier side is set. It is possible to use it as a drive shaft, but it is costly because a small ball bearing must be prepared separately.
Further, it is conceivable to replace the end plate with one having a bearing holding portion capable of accommodating a ball bearing so that the rotating shaft on the commutator side can be used as a drive shaft. In this case as well, the end plate may be replaced. Since it is necessary to manufacture the bearings separately and the parts cannot be shared, the cost is high.

The present invention has been made in view of the above problems, and the bearing members that support the rotating shafts protruding from both ends of the rotor are attached to each other according to the load acting on each rotating shaft, the application of the motor, the installation position, and the like. It is an object of the present invention to provide a DC motor capable of easily changing from sleeve bearings having the same diameter to ball bearings or vice versa, and cost reduction can be achieved by sharing parts.

According to the DC motor of the present invention, the above problems are solved as follows.
(1) A tubular motor case in which one end is closed and the other end is open, an end cap that closes the opening, and an end cap that is housed in the motor case, and is centered in the direction of one end of the motor case and the said. A rotor having a rotation shaft extending in the end cap direction is provided, the rotation shaft extending in the direction of one end of the motor case is used as a first output shaft portion, and the rotation shaft extending in the end cap direction is used. As the second output shaft portion, the first output shaft portion and the second output shaft portion are formed on the first bearing holding portion formed on one end of the motor case and the second bearing formed on the end cap. In a DC motor supported by bearing members provided in each holding portion,
The inner diameters of the first bearing holding portion and the second bearing holding portion are the same as each other, and a sleeve bearing or a ball bearing having the same outer diameter as the bearing member is placed inside the first and second bearing holding portions. Allows it to be selectively accommodated.

According to such a configuration, since the inner diameters of the first bearing holding portion of the motor case and the second bearing holding portion of the end cap are made equal to each other, sleeve bearings or ball bearings having the same outer diameter are attached to them. It can be selectively accommodated according to the load acting on the output shaft and the second output shaft, the application of the motor, the installation position, etc., and if necessary, from the sleeve bearing to the ball bearing. , Or vice versa.
Therefore, unlike conventional DC motors, ball bearings and sleeve bearings with different outer diameters can be prepared separately, or ball bearings and sleeve bearings with different outer diameters can be supported by the first bearing holder or the second bearing holder. It is not necessary to separately manufacture motor cases and end caps with different inner diameters, and the cost can be reduced by sharing the parts.

(2) In the above item (1), tubular bosses having the same inner diameters protruding in opposite directions are formed substantially symmetrically on the outer surface of one end of the motor case and the outer surface of the end cap. The boss on the case side is used as the first bearing holding portion, and the boss on the end cap side is used as the second bearing holding portion.

According to such a configuration, only the outer surface of one end of the motor case and the central portion of the outer surface of the end cap are projected in opposite directions to form bosses symmetrically, and both bosses are formed in the first bearing holding portion and the first bearing holding portion. Since it is a two-bearing holding part, it is necessary to increase the wall thickness of one end of the motor case and the end cap corresponding to the length of the ball bearing and the sleeve bearing, and to form the first and second bearing holding parts in that part. There is no.
Therefore, not only can the motor case and end cap be made smaller and lighter, but the motor case and end cap can be shared to meet a wide variety of requirements such as the size of the load on the motor, the application and installation position of the motor, etc. It is possible to reduce the cost.

(3) In the above item (2), the end cap is fixed to the open end of the motor case so as to cover the synthetic resin cap body fitted to the open end of the motor case and its outer surface. A boss is formed on the shield cap, and the boss is used as a second bearing holding portion into which a sleeve bearing or a ball bearing is press-fitted.

According to such a configuration, if the boss formed on the metal shield cap is used as the second bearing holding portion, the strength and rigidity of the second bearing holding portion are also increased, so that the sleeve bearing or ball bearing accommodated therein is also increased. Even if a large load in the radial direction acts on the bearing, it can sufficiently cope with it.

(4) In any of the above items (1) to (3), either one of the first and second output rotation shafts supported by the ball bearing is used as the drive shaft for driving the driven member.

According to such a configuration, since the ball bearing has a large load-bearing load, even if the load from the driven member repeatedly acts on the drive shaft, there is no problem in durability.

(5) In any of the above items (1) to (4), the DC motor is provided with a commutator on the second output shaft portion and a brush on the end cap that is in sliding contact with the commutator. It is a DC motor with a brush, and a sleeve bearing is housed in a first bearing holding portion, and a driven member is driven by a second output shaft portion.

According to such a configuration, the side of the first bearing holding portion in which the sleeve bearing is housed can be easily covered with a waterproof case or the like to form a waterproof structure, so that the portion is directed in a direction in which rainwater can easily enter. The second output shaft portion on the end cap side with the commutator and the brush can be arranged so as to be in a direction in which rainwater is less likely to enter.

According to the present invention, the bearing members supporting the rotating shafts protruding from both ends of the rotor are changed from sleeve bearings having the same diameter to ball bearings according to the load acting on both rotating shafts, the application of the motor, the installation position, and the like. And vice versa, a DC motor can be provided that can be selectively and easily modified.

FIG. 5 is a front perspective view of a DC motor according to the present invention as viewed from diagonally above with the end cap side facing the front. Similarly, it is a rear perspective view of the motor of the first embodiment viewed from diagonally above with the end cap side facing the rear and upside down. It is an end view of the motor of Example 1 as seen from the end cap side. It is a vertical sectional view in line IV-IV of FIG. It is a vertical sectional view which shows the motor of Example 1 and its use example. It is a vertical sectional view which shows the motor of Example 2 and the use example thereof. It is an enlarged sectional view of the 1st bearing holding part of the motor of Example 1, and the sleeve bearing accommodated therein. It is an enlarged cross-sectional view of the 1st bearing holding part of the motor of Example 2, and the ball bearing accommodated |

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

1 to 5 show Example 1 of a DC motor (hereinafter, abbreviated as a motor) according to the present invention. In the following, the left and right in FIG. 1 and the left and right in the cross-sectional view of FIG. 4 and below will be described as "left and right" in the motor.

In the motor 1, the rotor 6 and the commutator 9 are housed side by side in a laterally bottomed tubular motor case 2 made of a magnetic material (for example, iron-based metal) whose left end is closed by an end wall 2A and whose right end is open. The open end of the motor case 2 is closed by the end cap 3.

More specifically, a pair of upper and lower magnets 7 and 7 having a side view arc-shaped cross section are fixed to the back of a laterally bottomed tubular motor case 2 having an opening at the right end, and left and right between the upper and lower magnets 7 and 7. A rotor 6 that is integrated with a rotating shaft that faces a direction is arranged. A stator is formed by the motor case 2 and the upper and lower magnets 7 and 7.

The left rotation shaft extending in the end wall 2A direction of the motor case 2 in the rotation shaft of the rotor 6 is the first output shaft portion 4, and the right rotation shaft extending in the end cap 3 direction is the first. It is the output shaft portion 5 of 2.

Since the rotor 6 is arranged on the left side in the motor case 2, the protrusion dimension of the second output shaft portion 5 from the rotor 6 is larger than that of the first output shaft portion 4.

The rotor 6 is configured by winding an armature winding (not shown) around a core 8 laminated in the axial direction. A commutator 9 is fitted to the second output shaft portion 5, and a brush 15 described later is in sliding contact with the commutator 9.

The end cap 3 is composed of a synthetic resin cap body 10 fitted in the right opening end of the motor case 2 and a metal shield cap 11 that covers the outer surface of the cap body 10. The shield cap 11 is for reducing noise, and a plurality of caulking pieces 12 and 12 projecting in the axial direction from the right edge of the motor case 2 are provided on the outer peripheral edge of the shield cap 11 in a notch groove 11A. It is fixed to the open end of the motor case 2 by bending in the centripetal direction via the motor case 2.

In the motor case 2, the inner surface of the cap body 10 is slidably contacted with the outer peripheral surface of the commutator 9, and a current supplied via the terminal terminals 13 and 13 and the pigtail 14 is supplied to the armature winding of the rotor 6. A pair of upper and lower brushes 15 and 15 for the purpose are held by the brush holder 16. Since the forms of the terminal terminals 13, 13, the pigtail 14, the brush holder 16, and the connection form of the brush 15 are not directly related to the present invention, detailed description thereof will be omitted.
Further, a pair of choke coils, brush holders, and the like constituting the inductor of the noise prevention circuit are provided on the inner surface of the cap body 10 in a known manner, but these are also not directly related to the present invention. , Illustration and detailed description will be omitted.

At the center of the left end wall 2A of the motor case 2 and the outer surface of the shield cap 11, tubular bosses 17 and 17A having equal inner diameters protruding in opposite directions to each other are located on the rotation axis of the rotor 6. They are lined up and integrally formed almost symmetrically. The outer opening edges of both bosses 17 and 17A are bent inward to prevent the bearing members housed in them from coming off. The inner diameters of both bosses 17 and 17A are substantially the same as the outer diameters of the ball bearings 18 accommodated therein.

The boss 17 provided at the left end of the motor case 2 is a first bearing holding portion 171 in which a bearing member supporting the first output shaft portion 4 of the rotor 6 is housed, and is provided on the shield cap 11. The boss 17A formed is a second bearing holding portion 172 in which a bearing member supporting the second output shaft portion 5 of the rotor 6 is housed. The axial dimensions of the inner surfaces of the first bearing holding portion 171 and the second bearing holding portion 172 are substantially equal.

A ball bearing 18 is used as the bearing member housed inside the first bearing holding portion 171. The outer ring is pressed into the vicinity of the base of the first output shaft portion 4 and the outer ring is pressed into the vicinity of the base of the first output shaft portion 4. The vicinity of the base of the first output shaft portion 4 projecting outward from the first bearing holding portion 171 by press-fitting into the 171 is rotatably supported by the ball bearing 18.

For the bearing member housed inside the second bearing holding portion 172, for example, a sleeve bearing 19 obtained by impregnating a bronze-based porous bronze metal with lubricating oil is used, and penetrates the second bearing holding portion 172 to the outside. The second output shaft portion 5 projecting in the direction is rotatably supported through the sleeve bearing 19 which is press-fitted and fixed inside the second bearing holding portion 172. The ball bearing 18 and the sleeve bearing 19 have substantially the same axial dimensions, and are formed to be slightly longer so that they can be stably accommodated inside the first and second bearing holding portions 171 and 172. ing. Further, the protruding dimensions of the first output shaft portion 4 and the second output shaft portion 5 from the first and second bearing holding portions 171 and 172 are made equal to each other.

As shown in FIG. 7, which is an enlarged cross-sectional view, on both the inner and outer sides of the sleeve bearing 19, the second output shaft portion 5 is used to position the sleeve bearing 19 and the shield cap 11 in the axial direction. A pair of collars 20 and 20 are press-fitted so as to be able to rotate relative to the sleeve bearing 19 with flat washers 21 and 21 interposed therebetween.

To assemble the sleeve bearing 19 and both the inner and outer collars 20 to the second output shaft portion 5, after fitting the cap body 10 to the second output shaft portion 5, the inner collar 20, the sleeve bearing 19, and the outer are attached. The color 20 is performed in this order. In this case, after the sleeve bearing 19 and both collars 20 are attached to the second output shaft portion 5, the second bearing holding portion 172 of the shield cap 11 is press-fitted into the sleeve bearing 19.

Before attaching the shield cap 11 to the motor case 2, the sleeve bearing 19 is first press-fitted into the second bearing holding portion 172, and then the inner collar 20 is press-fitted into the second output shaft portion 5. , The sleeve bearing 19 may be fitted to the second output shaft portion 5 together with the shield cap 11, and finally the outer collar 20 may be press-fitted into the second output shaft portion 5.
Regardless of the assembly order, the sleeve bearing 19 and the shield cap 11 are positioned in the axial direction on the second output shaft portion 5, and in this state, the shield cap 11 is fixed to the open end of the motor case 2. be able to.

FIG. 5 shows a usage example of the motor 1 of the first embodiment, in which a first output shaft portion 4 supported by a ball bearing 18 is used as a drive shaft, whereby a trunk lid or a back door of an automobile (both). This is an example in which the actuator 22 for opening and closing (not shown) is driven. The motor 1 and the actuator 22 are housed in a tubular bracket 23 attached to the vehicle body.

The actuator 22 includes a planetary gear mechanism 24 and an output shaft 25 that is connected to the planetary gear mechanism 24 and has a screw (not shown) at the tip thereof. The planetary gear mechanism 24 is fixed to a tubular bracket 23, a sun gear 241 fixed to a first output shaft portion 4, a plurality of planetary gears 242 that are rotated by meshing with the sun gear 241 and meshing each planetary gear 242. A carrier plate 27 integrally formed with a base portion of an output shaft 25 is connected to a support shaft 26 of each planetary gear 242.

The protrusion dimension of the second output shaft portion 5 from the second bearing holding portion 172 is slightly shorter than the protrusion dimension of the first output shaft portion 4 from the first bearing holding portion 171 and is a second output. A rotation sensor magnet 28 is fixed to the end of the shaft portion 5. The protruding dimensions of the first output shaft portion 4 and the second output shaft portion 5 from the first and second bearing holding portions 171 and 172 are such that the rotation shaft is formed longer in advance according to the application. The adjustment can be made by cutting one end of the rotating shaft or by forming the rotating shaft to a constant length and adjusting the press-fitting position of the rotor 6 into the rotating shaft.
In this way, it is not necessary to manufacture a plurality of rotating shafts having different lengths according to the application of the motor, and the cost can be reduced.
The power supply connectors 29 and 29 that are integrally connected are inserted into the terminal terminals 13 and 13.

When the motor 1 operates and the sun gear 241 rotates forward or reverse along with the first output shaft portion 4, each planetary gear 242 meshing with the ring gear 243 revolves around the sun gear 241 while rotating. The rotation of the first output shaft portion 4 in the motor 1 is decelerated and transmitted to the output shaft 25 via the carrier plate 27. When the output shaft 25 rotates, it is attached to the trunk lid or back door screwed to the screw shaft on the tip side thereof, so that the screw cylinder can be screwed to open and close the trunk lid or back door.

A radial load acts on the first output shaft portion 4 with the opening / closing operation of the trunk lid or the back door, and this radial load is accommodated in the first bearing holding portion 171 and has a large load capacity. Since it is received by the bearing 18, even if the trunk lid or the back door is opened and closed for a long period of time, there is no problem in terms of durability.

FIG. 6 shows the configuration of the second embodiment of the motor according to the present invention and an example of its use. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
In the motor 1 of the second embodiment, contrary to the one of the first embodiment, the ball bearing 18 is fixed inside the second bearing holding portion 172, and the sleeve bearing 19 is press-fitted into the inside of the first bearing holding portion 171. This is an example in which the second output shaft portion 5 supported by the ball bearing 18 is used as a drive shaft as a drive source for opening and closing a throttle valve (not shown) of an automobile engine.

In this example, the protruding dimension of the first output shaft portion 4 from the first bearing holding portion 171 is shorter than that in the first embodiment, and the entire motor 1 and the gear group described later are placed in the engine room. It is housed in a two-piece casing 30 to be attached.

The ball bearing 18 is fixed in the second bearing holding portion 172 as follows.
As shown in the enlarged cross-sectional view of FIG. 7, before attaching the shield cap 11 to the motor case 2, the ball bearing 18 and the flat washer 31 are fitted in the second bearing holding portion 172 in order from the left opening end. The outer ring of the ball bearing 18 is formed by pressing a plurality of locations on the left opening edge of the second bearing holding portion 172 with a caulking tool to form a plurality of plastic deformed portions 32 facing in the centripetal direction. It is caulked and fixed inside the bearing holding portion 172 via a flat washer 31. The inner ring of the ball bearing 18 is press-fitted into the second output shaft portion 5 when the shield cap 11 is attached to the motor case 2.
The ball bearing 18 can be fixed to the second bearing holding portion 172 by press fitting without caulking. In this case, the flat washer 31 is not always necessary.

A drive gear 33 is fixed to the second output shaft portion 5, and a reduction gear 34 having a large number of teeth is meshed with the drive gear 33. The throttle valve is opened and closed by a rotating shaft (not shown) of a driven gear that meshes with an output gear 35 formed on the outer peripheral surface of a boss shaft 341 that is integrated with the reduction gear 34.

In this way, when the second output shaft portion 5 on the rectifier 9 side is used as the drive shaft and the bearing member supporting the drive shaft is changed from the sleeve bearing 19 of the first embodiment to the ball bearing 18, the throttle valve opens and closes. Even if a radial load acts on the second output shaft portion 5, the load is received by the ball bearing 18 having a large load bearing load, so that the second output shaft portion 5 can rotate smoothly. Even if the throttle valve is opened and closed for a long period of time, there is little possibility that the second output shaft portion 5 will shake. Therefore, wear of the commutator 9 and the brush 15 is also suppressed, and their lifespan is extended.

Further, the motor 1 and the gear group are housed in the casing 30, and the first bearing holding portion 171 side in which the sleeve bearing 19 is housed is completely covered with the casing 30 to easily form a waterproof structure. Therefore, the part is arranged in the engine room in a direction in which rainwater easily enters, and the second bearing holding portion 172 side with the power supply system on the drive shaft side is directed in a direction in which rainwater does not easily enter. Can be placed.

As described above, in the present invention, the inner diameter of the first bearing holding portion 171 in the motor case 2 and the inner diameter of the second bearing holding portion 172 of the shield cap 11 are made equal to each other. The sleeve bearing 19 or the ball bearing 18 having a diameter is selectively fitted and held according to the load acting on the first output shaft portion 4 and the second output shaft portion 5, the application of the motor, the installation position, and the like. be able to.

Therefore, the ball bearing 18 and the sleeve bearing 19 having different outer diameters are separately prepared, or the inner diameter of the first bearing holding portion 171 or the second bearing holding portion 172 is corresponding to the ball bearing 18 and the sleeve bearing 19 having different outer diameters. It is not necessary to separately manufacture the motor case 2 and the shield cap 11 with different bearings, and the motor case 2 and the shield cap 11 can be shared to provide a wide variety of motor load sizes, applications, installation positions, etc. It is possible to meet the demand and reduce the cost.

The present invention is not limited to each of the above embodiments, and various modifications and modifications such as the following can be made without departing from the gist of the present invention.
The end cap 3 of the motor of the first and second embodiments is composed of a cap body 10 made of synthetic resin and a metal shield cap 11 covering the side surface thereof, and the bearing member is housed in the shield cap 11. Although the second bearing holding portion 172 is formed, the shield cap 11 may be omitted and the second bearing holding portion 172 may be formed on the cap body 10 when noise countermeasures are not required.

Further, in the motors of the first and second embodiments, only the output rotation shaft on the drive shaft side on which the load acts is supported by the ball bearing 18, but the other output rotation shaft on which the load does not act is also the same. It may be supported by an outer diameter ball bearing 18.

Further, when the load acting on the first output shaft portion 4 or the second output shaft portion 5 as the drive shaft is small, both of them may be supported by the sleeve bearing 19 having the same outer diameter.

Further, the wall thickness of the closed wall at the left end of the motor case 2 and the end cap 3 (or the shield cap 11) is made as large as the axial dimensions of the ball bearing 18 and the sleeve bearing 19, and at the center thereof. It is also possible to form the first and second bearing holding portions having the same inner diameter. In this way, it is not necessary to project the first and second bearing holding portions 171 and 172 as in the above embodiment.

1 DC motor 2 Motor case 2A End wall 3 End cap 4 1st output shaft part 5 2nd output shaft part 6 Rotor 7 Magnet 8 Core 9 Rectifier 10 Cap body 11 Shield cap 11A Notch groove 12 Caulking piece 13 Terminal terminal 14 Pigtail 15 Brush 16 Brush holder 17, 17A Boss 18 Ball bearing 19 Sleeve bearing 20 Color 21 Flat washer 22 Actuator 23 Cylindrical bracket 24 Planetary gear mechanism 25 Output shaft 26 Support shaft 27 Carrier plate 28 Rotation sensor magnet 29 Connector 30 Casing 31 Flat washer 32 Plastic deformation part 33 Drive gear 34 Reduction gear 35 Output gear 171 1st bearing holding part 172 2nd bearing holding part 241 Sun gear 242 Planetary gear 243 Ring gear 341 Boss shaft

Claims (5)

A tubular motor case in which one end is closed and the other end is open, an end cap that closes the opening, and an end cap that is housed in the motor case and is centered in the direction of one end of the motor case and the direction of the end cap. A rotor having a rotating shaft extending in the direction of the end cap is provided, the rotating shaft extending in the direction of one end of the motor case is used as a first output shaft portion, and the rotating shaft extending in the direction of the end cap is used as a second. As the output shaft portion, the first output shaft portion and the second output shaft portion are attached to the first bearing holding portion formed on one end of the motor case and the second bearing holding portion formed on the end cap. In a DC motor supported by bearing members provided respectively,
The inner diameters of the first bearing holding portion and the second bearing holding portion are the same as each other, and a sleeve bearing or a ball bearing having the same outer diameter as the bearing member is placed inside the first and second bearing holding portions. A DC motor characterized in that it can be selectively accommodated. Cylindrical bosses having equal inner diameters protruding in opposite directions are formed substantially symmetrically on the outer surface of one end of the motor case and the outer surface of the end cap, and the boss on the motor case side is the first. The DC motor according to claim 1, wherein the bearing holding portion has a boss on the end cap side as the second bearing holding portion. The end cap is a cap body made of synthetic resin fitted to the open end of the motor case, and a metal shield cap fixed to the open end of the motor case so as to cover the outer surface thereof. The DC motor according to claim 2, wherein the boss is formed on the shield cap, and the boss is used as the second bearing holding portion into which the sleeve bearing or the ball bearing is press-fitted. .. The DC motor according to any one of claims 1 to 3, wherein any one of the first and second output rotation shafts supported by the ball bearing is used as a drive shaft for driving a driven member. .. The DC motor is a brushed DC motor in which a commutator is provided on the second output shaft portion and a brush is provided on the end cap in sliding contact with the commutator, and the first bearing holding portion is provided with the commutator. The DC motor according to any one of claims 1 to 4, wherein the sleeve bearing is housed and the driven member is driven by the second output shaft portion.

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