JP2965877B2 - Motor with reduction gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor equipped with a speed reducer for reducing the output of an electric motor with a gear reducer and outputting the same.
The present invention relates to a motor with a speed reducer in which a power control semiconductor for supplying power to a stator winding of an electric motor is incorporated in a housing.

[0002]

2. Description of the Related Art A vehicle wheel motor used as a drive source of an industrial vehicle such as a loading and unloading vehicle is constituted by a motor with a speed reducer for reducing the output of an electric motor by a gear reducer and outputting the reduced output.

[0003] The motor with a reduction gear is disclosed in Japanese Patent Application No. 5-264199 and Japanese Patent Application No. 6-2028 by the present applicant.
No. 28 has disclosed. This motor with reduction gear
A housing configured by joining a first case accommodating the electric motor, a second case accommodating the gear reducer, a partition plate separating the first case and the second case, and driving the electric motor And an electric circuit for performing the operation, the electric circuit being housed in the housing.

In a motor with a reduction gear in which an electric circuit for driving the motor is housed in a housing, a MOSFE is used as an element for controlling a drive current to a winding of the motor.
A power control semiconductor such as T is used.

[0005]

However, the amount of heat generated by the power control semiconductor described above may be larger than the amount of heat generated by the windings. Therefore, it is necessary to take sufficient heat dissipation measures for the power control semiconductor. As a countermeasure against this heat radiation, there are methods such as devising the mounting position of the power control semiconductor so as not to adversely affect the surroundings, and providing a sufficiently large heat sink so that heat from the power control semiconductor can be easily dissipated. However, since the power control semiconductor is accommodated in the limited space inside the motor, the internal space of the housing must be expanded, and the size of the housing must be increased due to complicated wiring routes. May be invited.

SUMMARY OF THE INVENTION It is an object of the present invention to sufficiently obtain a heat radiation effect of a power control semiconductor incorporated in a housing without complicating a wiring route or increasing the size of a housing by heat dissipation measures of the power control semiconductor. To provide a motor with a reduction gear.

[0007]

According to the first aspect of the present invention,
A first case accommodating the motor, in a motor with a speed reducer that outputs the output of the motor after being reduced by a gear reducer,
A second case accommodating the gear reducer, a housing configured by joining a partition plate for partitioning between the first case and the second case, and a stator winding of the electric motor; A power control semiconductor for supplying a drive current, and a bus plate for interconnecting each of the stator windings and wiring connection with the power control semiconductor; An attachment portion is formed on the surface of the partition plate facing the first case so as to bulge toward the first case, and the heat dissipation surface of the power control semiconductor is formed on the first surface of the partition plate. Placed radially inward of the mounting portion of the partition plate so as to be in close contact with the opposing surface of the case, and arranging the bus plate in a space formed between the partition plate and the electric motor; Semiconductor Characterized by being sandwiched fixed by the over preparative and the partition plate.

[0008]

[0009]

According to a second aspect of the present invention, in the motor with a speed reducer according to the first aspect, the electric motor is a DC brushless electric motor having a magnet rotor provided inside the stator, and the power control semiconductor is provided. It is characterized in that the fixed supporting portion of the portion close to the partition plate is disposed radially inside the mounting portion of the partition plate so as to be included in the projection range of the magnet rotor of the electric motor in the output axis direction.

According to a third aspect of the present invention, in the motor with a speed reducer according to the second aspect, the number of the power control semiconductors is plural, and each of the power control semiconductors is arranged around an output shaft of the rotor. It is characterized by being arranged radially.

The invention described in claim 4 is the first to third aspects of the present invention.
In the motor with a speed reducer according to any one of the above, the housing is housed in an internal space of a wheel of a vehicle, and an attachment portion with the wheel is provided on an output shaft of the gear reducer, as a wheel motor for a vehicle. It is characterized by using.

[0013]

According to the structure of the motor with a reduction gear according to the first aspect of the present invention, a power control semiconductor for supplying a drive current to each stator winding of the motor is formed by bulging a partition plate of the motor. Since the heat-dissipating surface of the power control semiconductor is closely contacted with the opposing surface of the first case of the partition plate, the partition plate is used as a heat-dissipating plate of the power control semiconductor, since it is disposed radially inward of the mounting portion. Large heat dissipation area can be secured. In addition, the bus plate is arranged in the space formed between the partition plate and the electric motor, and the power control semiconductor is sandwiched and fixed between the bus plate and the partition plate. The mounting of is stabilized.

[0014]

[0015]

According to a second aspect of the present invention, the motor is a DC brushless motor having a magnet rotor provided inside the stator, and the power control semiconductor is closely attached to the partition plate. Since the fixed support part of the part is arranged radially inside the mounting part of the partition plate so as to be included in the projection range of the magnet rotor of the motor in the output axis direction,
The mutual influence between the heat generated by the power control semiconductor and the heat generated by the stator windings is reduced, and at the time of assembly, the power control semiconductor can be fixed through the magnet rotor insertion holes of the motor stator. Become.

In the configuration of the motor with a speed reducer according to the third aspect, the number of the power control semiconductors is plural, and each of the power control semiconductors is radially arranged around the output shaft of the rotor. Even if there is a large amount of heat generated due to an increase in the number of semiconductors for use, the mutual influence with the heat generated by the stator winding is suppressed to a small range.

In the configuration of the motor with a speed reducer according to the fourth aspect, the housing is housed in the internal space of the wheel of the vehicle,
Since the mounting portion with the wheel is provided on the output shaft of the gear reducer and used as a wheel motor for the vehicle, the necessary space to be secured in the vehicle for mounting the conventional driving motor is very small, This can be easily electrified by replacing the unpowered wheels of the mobile vehicle.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional view showing the structure of a first embodiment of a motor with a speed reducer according to the present invention, FIG. 2 is a transverse sectional view showing a motor accommodating portion of the motor with a speed reducer of FIG. 1, and FIG. FIG. 4 is a plan view showing a second substrate of the motor with a reduction gear of FIG. 1, and FIG. 4 is a transverse sectional view showing a first substrate accommodation portion of the motor with a reduction gear of FIG.

As shown in FIG.
A housing 60 is provided.
And a gear reducer 5 that reduces the rotational output of the motor 4 and outputs the reduced output.
And built-in.

The housing 60 has a substantially bowl-shaped outer case 6.
1 (second case) and an inner case 62 (first case) with a partition plate 63 interposed therebetween. Inner case 6
2, the partition plate 63 and the outer case 61 are integrally fastened and fixed by bolts 10. The outer case 61, the inner case 62, and the partition plate 63 are cast by aluminum die casting.

A shaft insertion hole 61a is provided at the center of the outer case 61.
Is formed, and inside the outer case 61 (inside the housing 60), a partition wall portion 6 for forming a horseshoe-shaped space S isolated from the gear reducer 5 as described later.
1b is formed.

A stator mounting portion 63a bulging toward the inner case 62 is formed on the side of the partition plate 63, and three holes 63b extending in the thickness direction of the partition plate 63 are formed in the stator mounting portion 63a. Are formed. At the center of the partition plate 63,
An insertion hole 63c for inserting (penetrating) a shaft length portion of the rotor main body 8b described later in a non-contact state is formed.

The electric motor 4 is housed in the inner case 62, and is composed of a closed slot iron core.
7, a rotor (rotor) 8 rotatably provided inside the stator 7, and an output shaft 9 for outputting the rotation output of the rotor 8 via the gear reducer 5.

The stator 7 includes a magnetic pole core 7b and a yoke core 7 arranged so as to surround the magnetic pole core 7b.
a. The magnetic pole portion core 7b is formed by laminating a number of magnetic thin plates (magnetic steel plates) on which a plurality of magnetic pole tooth forming protrusions extending radially outward from a ring-shaped connecting portion through which the rotor 8 is inserted are formed. It is constituted by that. The magnetic pole teeth are arranged at equal intervals in the circumferential direction of the connecting portion, and a closed slot is formed between the magnetic pole teeth by the connecting portion.

A three-phase field coil 7d is wound around each magnetic pole tooth via a coil bobbin 7c, and a stator winding is formed by the field coil 7d.

The yoke core 7a is formed by laminating a number of ring-shaped magnetic thin plates having a plurality of notches formed in the inner peripheral portion. Each notch in the inner peripheral portion forms a fitting groove, and the tip of the magnetic pole tooth of the corresponding magnetic pole core 7b is fitted in each fitting groove.

The outer periphery of the yoke core 7a is
Are fixed between the stator mounting portion 63a and the presser plate 30 and are fixed to the stator mounting portion 63a by bolts 13.

The rotor 8 has a rotor body 8 having a shaft insertion hole 8a as a rotation center hole over the entire length of the shaft.
b. A plurality of magnetized magnets 8c arranged at equal intervals in the circumferential direction are mounted on the outer peripheral portion of the rotor main body 8b, and the partition plate 63 is arranged in the axial direction of the rotor 8.
A projection 8d for detecting the position of the rotor 8 is formed to project toward. The protruding portions 8d are provided with notches arranged at equal intervals in the circumferential direction.

The axial length of the inner peripheral portion of the rotor main body 8b is longer than the axial length of the outer peripheral portion, at which teeth forming the first gear 5a of the gear reducer 5 are formed. Rotor body 8
The outer peripheral portion having a short axial length b is rotatably opposed to the inner peripheral portion of the stator 7, and bearings 14a and 14a, such as ball bearings, which are press-fitted at both ends of the inner peripheral portion having a short axial length of the rotor body 8b. 1
It is configured to rotate about the output shaft 9 via 4b.

At one end of the output shaft 9, a keyway 9a and a screw hole 9b for mounting an output transmitted member are formed. The intermediate portion of the output shaft 9 is rotatable via a bearing 18 such as a ball bearing in a shaft insertion hole 61 a of an outer case 61, and the other end is rotatably mounted on a central recess of the inner case 62 via a bearing 19 such as a ball bearing. It is supported. The intermediate portion of the output shaft 9 and the shaft insertion hole 6 of the outer case 61
The gap with 1a is sealed by a seal member 27. The output shaft 9 is supported by the bearings 14a and 14b in the shaft insertion hole 8a of the rotor 8 as described above.
Is inserted (penetrated) in a non-contact state with respect to.

The electric motor 4 having the stator 7 and the rotor 8 as main components is a flat type brushless electric motor having a short axial length, and the dimension of the motor 1 with the reduction gear as a whole in the direction of the output shaft 9. Is configured to be shorter.

A plurality of gear reducers 5 (4 in this embodiment)
) Gears 5a, 5b, 5c, 5d. That is, the first gear 5a is integrally formed coaxially with the other end (the left end in FIG. 1) of the rotor 8 as described above. Second and third gears 5b, 5c
Are fixed to the same rotation shaft (support shaft) 20 so as to rotate integrally with each other, and the second gear 5b is meshed with the first gear 5a.

The rotation shaft 20 is disposed below the output shaft 9 so as to be eccentric to the output shaft 9. One end of the rotating shaft 20 is rotatably supported in a recess of the partition plate 63 via a bearing 21 such as a ball bearing, and the other end is rotatably supported in a recess of the outer case 61 via a bearing 22 such as a ball bearing. .

The fourth (final stage) gear 5 d is fixed to the output shaft 9 so as to rotate integrally with the output shaft 9. The third gear 5c is meshed with the fourth gear 5d.
Therefore, when the rotor 8 rotates by the action of the rotating magnetic field of the stator 7, the first gear 5 a integrally formed with the rotor 8 rotates at the same rotation speed as the rotor 8. The rotation output of the first gear 5a is transmitted to the fourth gear 5d after being reduced by the second and third gears 5b and 5c, and the output shaft 9 is the same as the fourth gear 5d with the reduced rotation of the fourth gear 5d. 8 at the number of rotations
And rotate in the same direction.

For example, when the rotor 8 rotates forward at 750 rpm, the output shaft 9 is decelerated by the gear
It rotates forward at 50 rpm, and its reduction ratio is 1/5.

In the space S separated from the gear reducer 5 formed by the partition plate 63 and the horseshoe-shaped partition wall portion 61b of the outer case 61, the first control circuit forming substrate 23 for driving the electric motor 4 is provided. Are mounted on the partition plate 63 with screws 24 (shown in FIG. 4). Horseshoe-shaped first substrate 23
As shown in FIG. 4, various circuit elements (for example, a control semiconductor 23 a) constituting a control circuit for driving the electric motor 4 are attached. As described above, by making the space for the control circuit into a horseshoe shape, it is possible to widen the accommodation space for the control circuit in the limited space in the housing 60.

In the space between the partition plate 63 and the electric motor 4,
A second substrate 25 for driving circuit formation, which is driven by a signal from a control circuit formed on the first substrate 23 and supplies a driving current to the electric motor 4, is provided. As shown in FIG. 3, the second substrate 25 is formed of a donut-shaped bus plate whose outer dimensions are smaller than the inner diameter of the stator mounting portion 63 of the inner case 62.
3 is attached. 2nd board 2 by screw 25b
The fixed position of 5 is set so as to be included in the projection range of the rotor 8 in the direction of the output shaft 9.

A plurality of printed wiring paths (not shown) and through holes connected thereto are formed on each surface of the second substrate 25. The through holes are arranged at equal intervals along the circumferential direction of the outer peripheral portion of the second substrate 25, and the end 7e of the corresponding field coil 7d is connected to each through hole. The field coils 7d are connected to each other by connecting and fixing the through holes to the end portions 7e of the corresponding field coils 7d.

On the surface of the second substrate 25 facing the partition plate 63,
A plurality of power transistors (power MOSFETs) for supplying a current to the field coil 7d through its end 7e.
T) 25a and other circuit elements are mounted, and each power transistor 25a and circuit element are wired and connected to the corresponding printed wiring path by soldering. Each power transistor 25a is arranged radially with respect to the center of the second substrate 25 (the center of the output shaft 9), and the heat dissipation surface (the surface facing the partition plate 63) of each power transistor 25a is inside the partition plate 63. It is attached to the second substrate 25 so as to be in close contact with the opposing surface of the case 62 and at least a part of its close contact with the partition plate 63 is included in the projection range of the rotor 8 in the direction of the output shaft 9. . Further, each power transistor 25a has a heat radiating portion thereof on the second substrate 2.
5 and the partitioning plate 63. In this embodiment, twelve power transistors 25a are used for three-phase stator windings, and the number of power transistors 25a per phase line is set to four.

As described above, each power transistor 25a
Is mounted so that the heat radiating surface thereof is in close contact with the opposing surface of the inner case 62 of the partition plate 63. Therefore, a large heat radiating area is secured by using the partition plate 63 as a heat radiating plate of each power transistor 25a. Can be sufficiently obtained, and an increase in the size of the housing 60 caused by accommodating the power transistor 25a, which generates a large amount of heat, in a space can be suppressed to a small range.

Further, since each power transistor 25a is mounted on the donut-shaped second substrate 25 whose outer dimensions are smaller than the inner diameter of the stator mounting portion 63a bulging toward the inner case 62, each power transistor 25a is mounted. It is not necessary to increase the thickness of the housing 60 in the direction of the output shaft 9, and the overall thickness of the motor with reduction gear 1 can be reduced to suppress an increase in size.

Further, at least a part of each power transistor 25a which is in close contact with the partition plate 63 is
Are arranged so as to be included in the projection range in the direction of the output shaft 9 of the stator 7, the heat generation position from each power transistor 25 a is slightly separated from the position opposite to the heat generation position from the field coil 7 d of the stator 7, and Can be reduced.

Further, each power transistor 25a is provided on a second substrate 25 for connecting the field coils 7d of the stator 7 to each other.
By attaching and wiring, the large current wiring path can be shortened, the wiring can be simplified, and the circuit resistance (loss) can be reduced.

Furthermore, in addition to fixing each power transistor 25a to the wiring path of the second substrate 25,
Since the power transistor 25a is fixedly held between the substrate 25 and the partition plate 63, not only the fixing of the power transistors 25a but also the attachment of the second substrate 25 can be stabilized.

The first substrate 23 is connected to a control line 32 formed by bundling a plurality of small signal lines for supplying a control signal from the outside. The control line 32 is connected to a stator mounting portion 63 a of a partition plate 63. Is guided to the outside of the housing 60 through one of the holes 63b and the hole 62a of the inner case 62 connected thereto. In the part located in the hole 63a of the control line 32,
A retaining member (not shown) is attached so that when a pulling force is applied from the outside, this force does not reach the first substrate 23 side.

Similarly, a pair of power lines 31 for supplying a direct current for driving the electric motor 4 from the outside is provided on the second substrate 25.
Are connected, and each power line 31 is connected to the corresponding stator mounting portion 63.
a of the inner case 62 connected to the hole 63b of FIG.
It is led to the outside of the housing 60 via 2a. A control line 32 is provided at a portion of each power line 31 located in the hole 63a.
Similarly to the above, the retaining member 33 is attached so that when a pulling force acts from the outside, this force does not reach the second substrate 25 side.

On the opposite surface of the inner case 62 of the second substrate 25, three light detection type sensors 26 for detecting the position of the rotor 8 of the electric motor 4 are mounted. Each sensor 26 includes a second substrate 25 facing the protrusion 8 d of the rotor 8.
The motor 4 is disposed at a predetermined angle (120 degrees in this embodiment) at an upper position, and based on a detection signal from each sensor 26.
Of the rotor 8 is detected. Each sensor 26 forms an optical path, and outputs a detection signal in accordance with interruption or opening of the optical path by the protruding portion 8d.

It should be noted that, instead of the sensor 26, the rotor 8
A position detecting means comprising a ring-shaped magnet buried in the upper surface of the first substrate and a magnetic pole sensor attached at a predetermined angle (for example, 120 degrees) at a position on the second substrate 25 facing the ring-shaped magnet is used. The magnetic pole sensor may be a magnetic sensor such as a Hall element.

The first substrate 23 and the second substrate 25 are
The wires are connected by a cable connector (not shown).

Next, the procedure for assembling the motor with a reduction gear will be described.

When assembling a motor with a reduction gear, first,
An outer case unit in which the seal member 27 and the bearings 18 and 22 are attached to the outer case 61 by press fitting, an inner case unit in which the bearing 19 is attached to the inner case 62 by press fitting, and the like; Substrate 23
And a partition plate unit in which the second board 25 and the second board 25 are connected by wiring.

When forming the partition plate unit, first, the bearing 19 is attached to the partition plate 63 by press fitting or the like.
By connecting the through holes of the second substrate 25 to which the power transistors 25a and other elements are connected by wiring and the corresponding ends 7e of the field coils 7d, the second substrate 25 and the stator 7 are integrally formed. Fixed.

Each power line 31 connected to the second substrate 25 is provided with a retaining member 33, and each power line 31 is provided with a hole 63 formed in a stator mounting portion 63a.
It is drawn out of the partition plate 63 through b.

After each power line 31 is drawn out, the second
The stator 7 to which the substrate 25 is integrally fixed is a bolt 13
The stator mounting portion 63a of the partition plate 63 and the holding plate 30
It is attached in a state sandwiched between.

Next, mounting work for fixing the second substrate 25 to the partition plate 63 with screws 25b together with the heat radiating portion of each power transistor 25a through the insertion hole of the rotor 8 of the stator 7 is performed. In this mounting operation, since the fixing position of the second substrate 25 by the screw 25b is set to be included in the projection range of the rotor 8 in the direction of the output shaft 9, the insertion hole of the rotor 8 of the stator 7 is inserted. The screw 25b can be easily attached by a driver or the like that can be inserted through the screw 25b.

Next, the first substrate 23 is mounted on the surface of the partition 63 opposite to the surface on which the second substrate 25 is mounted.
The board 23 and the second board 25 are wired by a connector (not shown). The power line 31 is connected to the control line 32.
Similarly to the above, the retaining member is attached, and the control line 32 is passed through the hole 63b of the corresponding stator attaching portion 63a.
3 is pulled out.

In this way, a partition plate unit in which the stator 7 and the first substrate 23 and the second substrate 25 are attached to the partition plate 63 in a state of being connected by wiring is formed.

After each unit is formed and prepared, in the outer case unit, first, the outer case 61 is provided with the output shaft 9 to which the fourth gear 5d is fixed, and the second and third gears 5b and 5c. The fixed rotating shaft 20 is attached.

Next, the partition plate unit is attached to the outer case unit, and the positioning and temporary fixing of the partition plate unit and the outer case unit are performed. At this time, the output shaft 9 is mounted so as to be inserted into the insertion hole 63c of the partition plate 63, and the rotary shaft 20 is supported by bearings 21 and 22.

Next, the rotor 8 having the bearings 14a and 14b mounted on the inner peripheral side by press-fitting or the like is inserted into the internal space of the stator 7 while fitting the bearings 14a and 14b to the output shaft 9. Output shaft 9 via bearings 14a and 14b
Supported by

Next, the power lines 31 and the control lines 32 are drawn out through the holes 62a of the inner case 62 of the inner case unit, and the inner case unit is separated from the surface of the partition plate 63 on which the stator mounting portion 63a is formed. So as to cover the partition unit. At this time, the end of the output shaft 9 is supported by the bearing 19.

Then, the outer case unit, the partition unit, and the inner case unit are integrally fastened and fixed by the bolt 10, and the assembling operation is completed.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a longitudinal sectional view showing the configuration of a second embodiment of the motor with a reduction gear of the present invention.

In this embodiment, an example in which the present invention is used as a vehicle wheel motor will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, a motor 1 with a reduction gear used as a wheel motor for a vehicle has tires (wheels).
The housing 60 includes a housing 60 disposed inside the wheel 3 on which the motor 2 is mounted. The housing 60 houses the electric motor 4 and the gear reducer 5. The rotational output of the electric motor 4 is transmitted to the wheel 3 via the gear reducer 5, and the transmitted rotational force drives the wheel 3 to rotate.

The inner case 62 constituting the housing 60 which is integrally fastened and fixed to the outer case 61 and the partition plate 63 is fixed to the vehicle body side (not shown) by bolts (not shown).

A mounting flange 15 is integrally formed at one end of the output shaft 9, and the mounting flange 15 is fixed to the hub 3 a of the wheel 3 with bolts 16 and nuts 17.

As described above, by using the motor 1 with a reduction gear having a small thickness of the housing 60 and a small size, many parts can be accommodated inside the wheel 3 and a conventional driving motor can be accommodated. The space required for installation is very small in the vehicle. Therefore, it can be easily electrified by replacing it with the wheel portion of the moving vehicle that is not powered.

[0072]

As described above, according to the motor with the reduction gear according to the first aspect, the power control semiconductor for supplying the drive current to each stator winding of the motor is bulged to the partition plate. Since it is arranged radially inside the mounting portion of the stator of the electric motor formed in this way, the axial thickness of the housing can be reduced, the overall axial dimension can be shortened, and the heat dissipation of the power control semiconductor Since the surface is in close contact with the opposing surface of the first case of the partition plate, a large heat radiation area is secured by using the partition plate as a heat radiator plate of the semiconductor for power control, and it is sufficient without increasing the size of the housing. A large heat radiation effect can be obtained. In addition, the bus plate is arranged in the space formed between the partition plate and the electric motor, and the power control semiconductor is sandwiched and fixed between the bus plate and the partition plate. Mounting can be stabilized.

[0073]

[0074]

According to the motor with reduction gear according to the second aspect,
The motor is constituted by a DC brushless motor having a magnet rotor provided inside the stator, and the power control semiconductor is fixed to the partition plate at a fixed support portion in the direction of the output shaft of the magnet rotor of the motor. Since it is arranged radially inside the mounting part of the partition plate so as to be included in the projection range of, the mutual influence between the heat generation of the power control semiconductor and the heat generation of the winding can be reduced, and at the time of assembly The operation for fixing the power control semiconductor can be performed through the insertion hole of the magnet rotor of the stator of the electric motor.

According to the motor with reduction gear according to the third aspect,
The number of power control semiconductors is plural, and each of the power control semiconductors is arranged radially around the output shaft of the rotor. The mutual influence with the heat generation of the winding is suppressed to a small range.

According to the motor with reduction gear according to claim 4,
The housing is housed in the interior space of the wheel of the vehicle, and the output shaft of the gear reducer is provided with a mounting portion for the wheel, and is used as a wheel motor for the vehicle. The required space to be secured is very small. Therefore, it can be easily electrified by replacing it with the wheel portion of the moving vehicle that is not powered.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a first embodiment of a motor with a reduction gear of the present invention.

FIG. 2 is a cross-sectional view showing a motor accommodating portion of the motor with a reduction gear of FIG.

FIG. 3 is a plan view showing a second substrate of the motor with a speed reducer of FIG. 1;

FIG. 4 is a transverse sectional view showing a first substrate accommodating portion of the motor with a speed reducer of FIG. 1;

FIG. 5 is a longitudinal sectional view showing the configuration of a second embodiment of the motor with a reduction gear of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor with reduction gear 3 ... Wheel 4 ... Electric motor 5 ... Gear reduction gear 5a ... 1st gear 5b ... 2nd gear 5c ... 3rd gear 5d ... 4th gear (final stage gear) 7 ... Stator 7d ... Field Coil (stator winding) 8 Rotor 9 Output shaft 15 Mounting flange 25 Second substrate 25a Power transistor (power control semiconductor) 60 Housing 61 Outer case (second case) 62 Inner case (First case) 63: Partition plate 63a: Stator mounting part

Continuation of the front page (72) Inventor Yoshihiro Iijima 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Technical Research Institute Co., Ltd. (56) References JP-A-6-38452 (JP, A) JP-A-3-14951 (JP, U) Japanese Utility Model Showa 64-25863 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 7/00-7/20 H02K 29/00-29/14 B60K 7 / 00

Claims (4)

(57) [Claims] A first case accommodating the motor; a second case accommodating the gear reducer; and a first case accommodating the gear reducer. A housing configured by joining a partition plate for partitioning between the case and the second case,
A power control semiconductor for supplying a drive current to each stator winding of the motor and each of the stator windings are connected to each other.
And a wiring connection with the power control semiconductor.
And a bus plate for forming the mounting portion of the stator of the electric motor on the surface of the partition plate facing the first case so as to swell toward the first case.
Wherein the radiating surfaces of the power control semiconductor is disposed radially inward of the mounting portion of the partition plate so as to closely opposing surface of the first case of the partition plate, the partition plate and the electric motor
Place the bus plate in the space formed between
The power control semiconductor is divided into the bus plate and the partition plate.
A motor with a speed reducer, characterized by being clamped and fixed by: 2. The electric motor is provided inside the stator.
Composed of a brushless DC motor with
And the power control semiconductor is transferred to the partition plate.
The fixed supporting part of the close part is the output of the magnet rotor of the electric motor.
Take the partition plate so that it is included in the projection range in the force axis direction.
The radially inner portion of the attachment portion.
2. The motor with a reduction gear according to 1. 3. The number of the power control semiconductors is plural.
And each of the power control semiconductors is connected to the output of the rotor.
A radial arrangement around a force axis.
2. The motor with a reduction gear according to 2. 4. The vehicle according to claim 1, wherein said housing is inside a wheel of a vehicle.
Housed in a space, and the above-described wheel is attached to the output shaft of the gear reducer.
With a mounting part for the
4. Any one of claims 1 to 3, wherein
A motor with a speed reducer according to the above.