JP2823449B2 - Electric motor - 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 having a commutator, and more particularly to an improvement in an electrical connection between a brush and a stator field coil.

[0002]

2. Description of the Related Art Conventionally, as this kind of electric motor, for example, Japanese Patent Application Laid-Open No. 1-1474 (H02K 13/00) is known. In this motor, an insulated terminal block having terminals connected to a field coil is provided on a stator core, a brush sleeve for holding a brush is mounted on a brush holder formed on a bracket, and a contact fixed on the brush sleeve. The spring is configured to elastically contact the terminal of the terminal block. However, in this configuration, it is necessary to fix the contact spring to the brush sleeve by a method such as welding or the like, and there is a disadvantage in that the assembling workability is poor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide an electric motor capable of improving assembly workability.

[0004]

According to a first aspect of the present invention, there is provided:
A stator core on which a field coil is wound; an insulating terminal block provided on the stator core; a terminal provided on the terminal block and connected to the field coil; and an insulating terminal provided on the bracket. A brush holder, a conductive brush sleeve supported by the brush holder and holding the brush in sliding contact with the commutator of the rotor and electrically connected to the brush; and a terminal of the terminal block mounted on the brush holder and connected to the brush holder. And a conductive elastic piece elastically in contact with the brush sleeve, a step portion having a diameter decreasing from an opening end side of the bracket toward a bracket bottom portion side is formed on the bracket side wall, and a bracket inner surface is formed on the terminal block. And a contact portion for contacting the step and the terminal block for positioning the terminal block in the direction of the bottom surface of the bracket.

According to the above arrangement, the stator core having the terminal block mounted thereon is press-fitted into the bracket to which the brush holder is fixed, and the contact portion of the terminal block is brought into contact with the step of the bracket to position the terminal block. . Then, the terminal provided on the terminal block is securely pressed against the elastic piece with a predetermined pressure, and the free end of the elastic piece is deformed toward the inside of the brush holder. In this state, when the brush sleeve is mounted on the brush holder, the free end of the elastic piece presses against the brush sleeve, and the contact pressure between the elastic piece and the brush sleeve and the contact pressure between the elastic piece and the terminal become uniform, and the field The electrical connection between the coil and the brush is ensured. In addition, when the brush sleeve is inserted into the brush holder, a force is applied to the terminal block in a direction in which the terminal box is deformed to the inside of the bracket, but the contact portion abuts on the inner surface of the bracket to prevent the terminal block from being deformed. .

According to a second configuration of the present invention, a stator core having a field coil wound thereon, an insulating terminal block provided on the stator core, and a terminal coil provided on the terminal block and connected to the field coil are provided. Contact piece and connecting piece, an insulative brush holder provided on the bracket, and an electrically conductive brush that is supported by the brush holder and that slides on the commutator of the rotor and that is electrically connected to the brush. A brush sleeve, and a conductive elastic piece attached to the brush holder and resiliently contacting the contact piece and the brush sleeve of the terminal block. The terminal block has a connection piece to which a field coil is selectively connected. A plurality of connection piece mounting terminal boxes to be mounted and a contact piece mounting terminal box to which a contact piece with which the elastic piece abuts are formed.

[0007] According to the above configuration, the stator core having the terminal block mounted thereon is pressed into the bracket to which the brush holder is fixed to a predetermined position. Then, the contact piece provided on the terminal block is pressed against the elastic piece, and the free end of the elastic piece is deformed toward the inside of the brush holder. In this state, when the brush sleeve is mounted on the brush holder, the free end of the elastic piece presses against the brush sleeve, and the contact pressure between the elastic piece and the brush sleeve and the contact pressure between the elastic piece and the contact piece become uniform. The electrical connection between the magnetic coil and the brush is ensured. Also, the terminal block has a connection piece mounting terminal box in which a connection piece to which a field coil is connected is mounted, and a contact piece mounting terminal box in which a contact piece with which an elastic piece abuts is mounted. By changing the connection, it is possible to cope with various specifications.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 denotes a metal bracket, and the first case 1
a and the second case 1b. On the side wall of the first case 1a, there is formed a step portion 1c having a smaller diameter from the opening end side to the bottom side, and a contact portion 14 of a terminal block 9 described later contacts the step portion 1c. The terminal block 9 is positioned on the bottom side of the first case 1a.
Reference numeral 2 denotes a rotor rotatably supported by a bearing 3 fixed to the first case 1a and the second case 1b. The rotor core 5 around which the coil 4 is wound is electrically connected to the coil 4. Commutator 6. 7 is the first case 1a
A field coil 8 is wound around each of the magnetic poles by a stator core having a pair of magnetic poles which are press-fitted into the magnetic poles.

Reference numeral 9 denotes a terminal block made of an insulating material mounted on the stator core 7, and is provided with a contact piece 10 which is electrically connected to the field coil 8 and which is in contact with an elastic piece 32 described later. A one-piece mounting terminal box 11 and a connection piece mounting terminal box 13 formed on both sides of the terminal box 11 and mounted with a connection piece 12 electrically connected to the field coil 8 are integrally formed. . Reference numeral 14 denotes an abutment portion formed on the terminal block 9, and the first case 1a
Abuts against the inner surface to prevent deformation of the terminal block 9;
The terminal block 9 is positioned in the direction of the bottom surface of the first case 1a by contacting the step 1c of the case 1a. Fifteen
Is a reinforcing rib formed on the side surface of the terminal box 11, and
To prevent deformation.

Reference numeral 16 denotes a holder made of an insulating material fixed to the first case 1a by rivets 18 via bosses 17 and has a pair of brush holders 19. 20 is a notch formed on the upper surface of the brush holder 19, 21 is a guide groove formed on both side surfaces of the upper portion of the brush holder 19, and a relay contact 29 described later is held in the guide groove 21 and formed on the intermediate contact 29. The elastic piece 32 faces upward from the notch 20. 22 is a holding groove formed in the center of both sides of the brush holder 19, 23 is a notch formed in the lower surface of the brush holder 19,
The flanges 27 on both sides of the brush sleeve 24 to be described later are held in the holding grooves 22, and cut and raised pieces 28 formed on the lower surface of the brush sleeve 24 are cut out.
The brush sleeve 24 is prevented from coming off by engaging with the brush 23.

Reference numeral 24 denotes a brush sleeve made of a conductive material, which houses the brush 25 and a spring 26 for urging the brush 25 outward, and is electrically connected to the brush 25. The brush sleeve 24 is mounted on the brush holder 19 by inserting flanges 27 formed on both sides from the opening formed in the first case 1a into the holding grooves 23 of the brush holder 19 and pushing in the direction of the rotor 2. The brush sleeve 24
The cut-and-raised piece 28 formed on the lower surface is engaged with the notch 23 of the brush holder 19 to prevent the brush holder 19 from falling off.

Reference numeral 29 denotes a relay terminal made of a conductive material.
The guide piece 22 is guided from both ends to the guide groove 22 of the brush holder 19 on both sides thereof, and is mounted on the cut and raised piece 30 and the bent piece formed on the other end.
31 prevents the brush holder 19 from falling off. Reference numeral 32 denotes a substantially rectangular elastic piece cut and raised from the relay terminal 29. One end of the elastic piece is a free end, and the free end is elastically contacted with the brush sleeve 24, and the central portion is elastically contacted with the contact piece 10 of the terminal block 9. It has become.

As shown in FIG. 1, the stator 7 having the terminal block 9 mounted on the first case 1a having the holding table 16 fixed thereto.
Is press-fitted, and the contact portion 14 of the terminal block 9 is brought into contact with the step portion 1c of the first case 1a for positioning. Then, the contact piece 10 provided on the terminal block 9 is securely pressed against the elastic piece 32 of the relay terminal 29 with a predetermined pressure, and the free end of the elastic piece 32 is deformed toward the inside of the brush holder 19. When the brush sleeve 24 is mounted on the brush holder 19 in this state, the free end of the elastic piece 32 is pressed against the brush sleeve 24, and the contact pressure between the elastic piece 32 and the brush sleeve 24 and the contact pressure between the elastic piece 32 and the contact piece 10 are increased. The contact pressure becomes even,
The electric connection between the field coil 8 and the brush 25 can be reliably performed.

Further, a brush sleeve for the brush holder 19 is provided.
When inserting the terminal 24, a force is applied to the terminal block 9 in a direction in which the terminal boxes 11, 13 are deformed inward of the bracket 1, but the contact portion 14 contacts the inner surface of the first case 1a and the terminal box 11 is reinforced. Since the ribs 15 are formed, deformation of the terminal block 9 is prevented.

FIG. 9 shows a field coil 8, a contact piece 10 and a connection piece.
Twelve connection examples are shown, and FIG. 10 is a circuit diagram thereof. Also,
FIG. 11 shows a connection example of the field coil 8 and the contact piece 10 and the connection piece 12 when rotating the rotor 2 in a direction opposite to the connection example of FIG. 9, and FIG. 12 shows a circuit diagram thereof. FIG. 13 shows a connection example of the field coil 8 provided with the rotation speed switching function, the contact piece 10 and the connection piece 12, FIG. 14 is a circuit diagram thereof, and 33 is a rotation speed changeover switch. FIG. 15 shows a connection example of a field coil 8 provided with a voltage switching function, a contact piece 10 and a connection piece 12,
FIG. 16 shows a circuit diagram thereof, in which the connection piece 12 is connected to the elastic piece 29 via a voltage switch 34 by a lead wire.
The solid line indicates the time of 120V switching, and the broken line indicates the time of 240V switching. As shown in FIGS. 9 to 16, various specifications can be handled according to the connection between the field coil 8 and the contact piece 10 and the connection piece 12.

[0017]

According to the first aspect of the present invention, the electric connection between the field coil and the resilient piece and between the resilient piece and the brush can be easily and reliably performed, and the assembling workability is improved. And deformation of the terminal block during assembly can be prevented. In addition, by contacting the contact portion formed on the terminal block with the step portion of the bracket, the terminal block can be positioned in the direction of the bottom surface of the bracket, and the elastic piece and the connecting piece, and the elastic piece and the brush sleeve can be reliably and reliably. It is possible to make contact with a predetermined pressure, and it is possible to ensure that the electric connection between the field coil and the elastic piece and between the elastic piece and the brush can be reliably maintained.

According to the configuration of the second aspect of the present invention, electrical connection between the field coil and the elastic piece and between the elastic piece and the brush can be easily and reliably performed, and the assembling workability can be improved. In addition, by changing the connection between the field coil and the connection piece in the terminal block, various specifications can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded view of a main part showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the main part.

FIG. 3 is an enlarged sectional view of the main part.

FIG. 4 is a sectional view of the same.

FIG. 5 is a sectional view of the main part.

FIG. 6 is a cross-sectional view seen from a different direction from FIG.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is an external view of the same.

FIG. 9 is a plan view showing a connection example of a field coil, a contact piece and a connection piece.

FIG. 10 is a circuit diagram of the same.

FIG. 11 is a plan view showing a connection example of another field coil, a contact piece, and a connection piece.

FIG. 12 is a circuit diagram of the same.

FIG. 13 is a plan view showing a connection example of another field coil with a contact piece and a connection piece.

FIG. 14 is the same circuit diagram.

FIG. 15 is a plan view showing a connection example of another field coil, a contact piece, and a connection piece.

FIG. 16 is a circuit diagram of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 1c Step part 2 Rotor 6 Commutator 7 Stator iron core 8 Field coil 9 Terminal block 10 Contact piece (terminal) 14 Contact part 19 Brush holder 24 Brush sleeve 25 Brush 32 Elastic piece

Claims (2)

(57) [Claims] 1. A stator core on which a field coil is wound, an insulating terminal block provided on the stator core, a terminal provided on the terminal block, connected to the field coil, and a bracket. An insulating brush holder provided; a conductive brush sleeve supported by the brush holder, which holds the brush in sliding contact with the commutator of the rotor and is electrically connected to the brush; And a conductive elastic piece elastically contacting the terminal of the terminal block and the brush sleeve, and forming a step portion on the bracket side wall having a diameter decreasing from an opening end side of the bracket toward a bracket bottom side, An electric motor characterized in that an abutment portion is formed on the base to abut the inner surface of the bracket and abut the step to position the terminal block in the direction of the bottom surface of the bracket. 2. A stator core on which a field coil is wound, an insulating terminal block provided on the stator core, and a contact piece and a connection piece provided on the terminal block and connected to the field coil. When,
An insulating brush holder provided on the bracket, a conductive brush sleeve supported by the brush holder, which holds the brush in sliding contact with the commutator of the rotor and is electrically connected to the brush; The terminal block has a plurality of connection pieces to which a connection piece to which a field coil is connected is selectively mounted, the connection piece being provided with a conductive piece elastically contacting the contact piece and the brush sleeve of the terminal block. An electric motor comprising a terminal box and a contact piece mounting terminal box on which a contact piece with which the elastic piece contacts is mounted.