JP2001231235A - Dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC motor which has a simple construction and whose total length in its axial direction is reduced. SOLUTION: One side ends of leads 4, penetrating through an axial hole 5a in a shaft 5, are drawn out from one side of a shaft 5 and connected to brushes 1 and the other side ends are drawn out from the other end of the shaft 5 to a housing 6 side and connected to a control board of an actuator, driven by the motor, on the housing 6 side. An annular recess in which the brushes 1 are housed is formed on one side of an armature 8. The brushes 1, commutators 3, winding parts 9 of the armature 8 and a stator 10 are arranged in a cover 11 so as to face each other in the radial direction. A control unit C comprising the brushes 1 and the rectifiers 3 and a power unit P comprising the winding parts 9 and the stator 10 are arranged in parallel with each other in the radial direction of a DC motor, so that the total length of the motor in its axial direction can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC motor, and more particularly, to a DC brush motor, and more particularly, to a DC motor used for an application having a limited space for accommodating a motor, for example, as an ABS or TCS motor of a vehicle.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 10-136617 proposes a DC motor having a structure as shown in FIG. 2 as an ABS or TCS motor. Referring to FIG.
The DC motor according to this conventional example is mounted on a solid shaft 25 and radially opposed to a stator 30, an inner peripheral surface of the brush 21 mounted on the armature 28 and an outer peripheral surface thereof. And a commutator 23 in sliding contact.
The brush 21 is connected to a terminal 27 mounted on the cover 31 via a lead 24. Also, the stator 30
The mechanism composed of the winding part 29 of the armature 28, the so-called “power part P”, and the mechanism composed of the brush 21 and the commutator 23, the so-called “control part C” are arranged in the axial direction of the shaft 25. Are arranged to face each other.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. H10-136617
In the DC motor proposed in Japanese Patent Application Laid-Open Publication No. H10-260, the lead 24 is taken out through the cover 31 again with reference to FIG. For this reason, there is a problem that the number of processes of the cover 31 increases. In addition, it is necessary to seal the lead outlet on the cover 31, and there is a problem that the number of parts increases.

Further, in this DC motor, as described above, an outlet for the lead 24 is provided on the cover 31, and the power section P and the control section C are arranged facing each other in the axial direction. For this reason, there is a problem that the axial length of the motor is long. However, A
In particular, a motor for BS or TCS is required to have a short overall axial length of the motor.

An object of the present invention is to provide a DC motor having a simple structure in which the overall length of the motor in the axial direction is reduced.

[0006]

According to a first aspect of the present invention, there is provided a direct-current motor having a hole extending along an axial direction of a shaft, a lead penetrating the hole, and one end of the lead. The lead is drawn out from one side of the shaft and electrically connected to the brush, and the other end of the lead is drawn out from the other side of the shaft and taken out to the housing side.

According to this DC motor, the lead electrically connected to the brush is not taken out to the outside through the cover as in the prior art, but at a position separated from the brush via a hole formed in the shaft. That is, it can be taken out on the housing side. For this reason, it is not necessary to form the lead outlet on the cover, so that the overall axial length of the motor can be reduced. Further, the number of processing of the cover is reduced, and the configuration of the entire DC motor is simplified.

[0008] A DC motor according to a second aspect of the present invention comprises:
On one side of the armature, a recess for accommodating the brush and the commutator is formed, and in the cover of the DC motor, radially oppose each other in order from the radial center of the DC motor toward the outside. As described above, the brush, the commutator, the winding portion of the armature, and the stator are juxtaposed. In this DC motor, the overall axial length of the motor is further reduced.

The present invention mainly provides a stator, a shaft, an armature attached to the shaft and facing the stator in a radial direction, a brush, and a brush attached to the armature, The present invention is applied to a DC motor having a commutator that slides, a housing, and a cover that is joined to the housing and accommodates the stator, the armature, the brush, and the commutator between the housing and the housing. . In particular, the DC motor according to the present invention is suitably applied when the space for accommodating the motor is limited, and is particularly suitably adopted as an ABS motor and a TCS motor of a vehicle.

[0010] Other aspects and features of the present invention are as described in each claim, and the duplicate description will be omitted with reference to the claims. Thus, the features of each claim are deemed to be as set forth herein. In addition, each dependent claim does not contravene the principle of the invention described in each independent claim.
Applicable to each independent claim, and dependent claims may apply to other dependent claims.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described.

In a preferred embodiment of the present invention,
A part of the cover extends in the recessed portion formed on one side of the armature along the axial direction of the shaft toward the housing than the brush, and a bearing that supports the shaft is fixed to the cover extension. Is done. Further, a brush is attached to the cover extension. Preferably, all the bearings of the shaft are arranged closer to the housing than the brush along the axial direction of the shaft. According to these embodiments, the replacement of the brush is facilitated because the bearing is not in the way.

In a preferred embodiment of the present invention,
Leads extend through holes formed in the shaft and housing (eg, actuator body).

In a preferred embodiment of the present invention,
One end of the lead is bent to form a flat portion, a terminal is electrically connected to the flat portion, and the lead is electrically connected to the brush via the terminal.

In a preferred embodiment of the present invention,
An annular cover is joined to the housing, and an annular flat portion extending along the radial direction of the DC motor is formed on an outer peripheral portion or an outer edge of the annular cover so as to abut on an upper surface of the housing. According to this embodiment, the liquid tightness between the cover and the housing is improved.

In a preferred embodiment of the present invention,
The brush and the commutator are arranged so that the outer peripheral surface of the brush and the inner peripheral surface of the commutator are in sliding contact with each other. According to this embodiment, the sliding contact area between the two can be increased, and the electric resistance is reduced.

In a preferred embodiment of the present invention,
The bearing of the shaft is arranged along the axial direction of the shaft, on the output side of the shaft rather than the brush. The output side of the shaft is the side where the connection between the shaft and a mechanism (actuator) to which the rotational force of the DC motor is transmitted is located.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the preferred embodiments of the present invention described above, an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a DC motor according to one embodiment of the present invention. Referring to FIG. 1, the DC motor is housed between a housing (body) 6 that houses an actuator (not shown) and an annular cover 11 joined to an upper surface of the housing 6. The outer peripheral portion of the cover 11 is bent to form an annular flat portion extending along the radial direction of the DC motor so as to contact the upper surface of the housing 6 in a liquid-tight manner. The bearings of the shaft 5 are all arranged closer to the housing 6 than the brush 1 along the axial direction of the shaft 5. Part of the cover 11 has a shaft 5 inside a concave portion 12 formed on one side of an armature 8 described later.
One bearing 13 that extends toward the housing 6 from the brush 1 along the axial direction of the shaft 1 and supports the shaft 5 is fixed to an end of the cover extension 11a. Further, the brush 1 is attached to the cover extension 11a. In the housing 6, an intermediate portion of the shaft 5 is connected to the actuator.

Between the housing 6 and the cover 11, a stator 10, an armature 8 attached to the shaft 5 and facing the stator 10 in the radial direction, a brush 1, and an armature 8
And a commutator 3 slidably in contact with the brush 1 which is elastically pressed. Specifically, on one side of the armature 8, an annular concave portion 12 for accommodating the brush 1 extending in the radial direction is formed. The commutator 3 is fixed to a portion surrounding the concave portion 12 of the armature 8 such that the outer peripheral surface of the brush 1 and the inner peripheral surface of the commutator 3 are in sliding contact with each other. After all,
Inside the annular cover 11, in order from the radial center toward the outside so as to face each other in the radial direction of the DC motor,
Brush 1, commutator 3, winding 9 of armature 8, and stator 1
0 is juxtaposed. That is, the stator 10 and the armature 8
A power unit P including the winding unit 9 and a control unit C including the brush 1 and the commutator 3 are arranged (arranged) so as to face each other along the radial direction of the DC motor.

The shaft 5 extends from the inside of the cover 11 to the inside of the housing 6. A hole 5a is formed in the shaft 5 along the axial direction. The lead 4 penetrates the hole 5a, and the lead 4 further penetrates a hole 6a formed in the housing 6 coaxially with the hole 5a. One end of the lead 4 is led out from one side of the shaft 5 and is electrically connected to the brush 1 via the connection terminal 2. Note that one end of the lead 4 is bent into a hook shape to form a flat portion extending in the radial direction of the DC motor, and the connection terminal 2 is connected to this flat portion. On the other hand, the other end of the lead 4 is led out from the other side of the shaft 5 and is taken out to the housing 6 side. Power is supplied to the other end of the lead 4 via a hook-shaped connection terminal 7. For example, as the connection terminal 7, a terminal integrated with an ECU (actuator control circuit such as an ABS) substrate can be used.

Next, the advantages of the DC motor described above will be described with reference to FIG. First, since the lead 4 electrically connected to the brush is taken out on the housing 6 side, there is no need to provide a lead outlet on the cover 11 as in the related art. As a result, the overall length of the DC motor in the axial direction is shortened, and the shape of the cover 11 is simplified, and the number of machining steps is reduced.
In addition, power can be supplied to the brush 1 without taking the lead 4 out of the housing 6. Second, by arranging the power section P and the control section C along the radial direction of the DC motor, the overall axial length of the DC motor is further reduced.

In the above embodiment, a radial gap type DC motor having a cylindrical armature has been described. However, the present invention is not limited to only such an embodiment. The present invention can be implemented in various modes as long as the principle is not violated. For example, the present invention can be suitably applied to an axial gap type DC motor having a flat armature.

[0024]

According to the present invention, the motor has a reduced overall length in the axial direction (thinner) and a simplified structure of the cover. In particular, the DC motor is suitable as a motor for ABS and TCS of a vehicle. Is provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a DC motor according to one embodiment of the present invention.

FIG. 2 is a sectional view of a DC motor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush 2 Connection terminal (pigtail) 3 Commutator 4 Lead 5 Shaft 5a hole 6 Housing (actuator body) 6a hole 7 Connection terminal 8 Armature 9 Winding part 10 Stator 11 Cover (motor cover) 11a Cover extension part 12 Recess 13 bearing P power section C control section

Claims (6)

[Claims] 1. A stator, a shaft, an armature mounted on the shaft and facing the stator radially, a brush, and a commutator mounted on the armature and in sliding contact with the brush. A DC motor comprising: a housing; and a cover that is joined to the housing and that houses the stator, the armature, the brush, and the commutator between the housing and the housing. A hole extending along the axial direction of the shaft, and a lead penetrating the hole, one end of the lead is led out from one side of the shaft and electrically connected to the brush. The other end of the lead is led out from the other side of the shaft and taken out to the housing side. 2. An annular or cylindrical concave portion for accommodating the brush is formed on one side of the armature, and the rectifier is arranged so that an outer peripheral surface of the brush and an inner peripheral surface of the commutator are in sliding contact with each other. The brush is fixed to a portion surrounding the concave portion of the armature, in the cover, in order from the radial center of the DC motor to the outside, in order to radially oppose each other, the brush, the brush, The direct current motor according to claim 1, wherein a commutator, a winding portion of the armature, and the stator are juxtaposed. 3. A bearing in which a portion of the cover extends in the recess along the axial direction of the shaft toward the housing from the brush, and supports the shaft at an extending end of the cover. The DC motor according to claim 2, wherein? 4. The DC motor according to claim 1, wherein all bearings of the shaft are disposed closer to the housing than the brush along the axial direction of the shaft. 5. A stator, a shaft, an armature mounted on the shaft and facing the stator radially, a brush, and a commutator mounted on the armature and in sliding contact with the brush. And a housing, and a cover that houses the stator, the armature, the brush, and the commutator between the housing and the housing, the housing being joined to the housing,
An annular or cylindrical recess for accommodating the brush is formed on one side of the armature, so that an outer peripheral surface of the brush and an inner peripheral surface of the commutator are in sliding contact with each other. That the commutator is fixed to a portion surrounding the concave portion of the armature, and in the cover, in order from the radial center of the DC motor to the outside, in order to face each other along the radial direction, the brush, The commutator, the winding portion of the armature and the stator are juxtaposed, and further, along the axial direction of the shaft, bearings of the shaft are all disposed closer to the housing than the brush. A part of the cover extends in the recess along the axial direction of the shaft to the housing side than the brush, and a bearing that supports the shaft at an extending end of the cover. Is fixed, the brush is attached to the extending portion of the cover, an actuator is connected to an intermediate portion of the shaft, and an axial direction of the shaft is formed on the shaft. , A hole formed coaxially with the hole in the housing, and a lead passing through the hole and the hole, one end of the lead is led out from one side of the shaft. Electrically connected to the brush, the other end of the lead is led out from the other side of the shaft, taken out to the housing side, and electrically connected to a terminal on a control board of the actuator inside the housing. DC motor, which is electrically connected. 6. A stator, a shaft, an armature attached to the shaft and facing the stator along the radial direction, a housing accommodating at least the stator and the armature, and A DC motor having a brush attached to the armature and a commutator attached to the armature and slidably in contact with the brush, wherein a recess for accommodating the brush is formed on one side of the armature. That the commutator is fixed to a portion surrounding the concave portion of the armature so that the outer peripheral surface of the brush and the inner peripheral surface of the commutator are in sliding contact with each other; The brush, the commutator, the winding portion of the armature, and the stator are juxtaposed so as to face each other in the radial direction in order toward the outside. .