JPH11168851A - Dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components, assembly man-hours and a manufacturing cost, and furthermore, enable automatic assembly. SOLUTION: A connector 23 is directly connected to a covering member which covers the opening of a case 2. One side ends of the positive and negative terminals 27 and 28 are made to protrude into the case 2 and the bent parts 16a and 17a of plus and minus wiring terminals plates 16 and 17 and a capacitor 25 are welded to the protruding ends. The negative wiring terminal plate 17 is electrically connected to the covering member 3 and grounded with a grounding screw 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small DC motor mounted on an automobile or the like, and more particularly, to a DC motor having an integrated connector and capable of easily performing automatic assembly.

[0002]

2. Description of the Related Art In general, a vehicle height adjusting DC motor used in an automobile has a cord electrically connected to a power supply brush, and is connected to an external power supply (battery) via the cord.

FIG. 5 is a sectional view showing a conventional example of such a vehicle height adjusting DC motor, FIG. 6 is a right side view showing a part of the motor, and FIG. 7 is a view showing a brush, a brush holder and a terminal plate. It is. In these figures, a DC motor 1 includes a motor case 4 including a bottomed cylindrical case 2 and a lid member 3 for closing an opening of the case 2, and a rotor 5, a plurality of Permanent magnets 6 and power supply brushes 7
Etc. are stored. The case 2 is formed as a yoke for forming a magnetic circuit by being formed in a cylindrical body having one end opened by a ferromagnetic material.

[0004] The rotor 5 comprises a case 2 and a lid member 3.
A rotating shaft 9 rotatably supported by two bearings 8 fitted on the shaft, an armature 11 including a coil winding 10 and a commutator 12 commutator 12 mounted on the rotating shaft 9. Have been.

The permanent magnet 6 is formed of an arc-shaped magnet, and is fixed to the inner peripheral surface of the case 2 at equal intervals in the circumferential direction so as to surround the outer periphery of the armature 11 via an appropriate magnetic gap. Have been.

The power supply brush 7 is housed in four brush housings 14 provided on the brush holder 13 so as to be able to move forward and backward, respectively, and is urged toward the center of the brush holder 13 by a spring 15 so that the commutator 12 is moved. The power supply brush 7 and the commutator 12 are pressed against the outer peripheral surface of the
The direction of the current supplied to the coil winding 10 of the armature 11 is switched by mechanical sliding contact with the armature 11. Each power supply brush 7 is electrically connected via a pigtail 18 to plus and minus wiring terminal plates 16 and 17 attached to the back side of the brush holder 13.

The brush holder 13 is formed of a synthetic resin or the like, has a through hole 19 through which the rotating shaft 9 and the commutator 12 penetrate, and covers the opening of the case 2.

The cover member 3 is made of metal such as aluminum, and is fitted into the opening of the case 2 and welded. On the surface of the lid member 3, there is provided a cord connecting portion 21 for electrically connecting the motor-side cord 20 and the positive and negative wiring terminal plates 16, 17 to each other. One end of the motor-side cord 20 is connected to one end of each of the plus and minus wiring terminal plates 16 and 17 via a terminal 22 at the cord connection portion 21, and the other end is connected to a power supply-side cord (not shown) by a connector 23. Connected through. 25 is a radio noise preventing capacitor connected between one end of the positive and negative wiring terminal plates 16 and 17, 26 is a screw, and 27 and 28 are connectors 23.
Reference numeral 29 denotes a synthetic resin wiring board on which the capacitor 25 is mounted.

In such a DC motor 1, a coil winding 1 is supplied from an external power supply via a power supply brush 7 and a commutator 12.
When 0 is supplied, the rotor 5 can be rotated.

[0010]

The above-described conventional DC motor 1 has a motor-side cord 20 and one end of the cord 20 is connected to the plus and minus wiring terminal plates 16 and 17 via terminals 22. The other end is connected to the power cord via the connector 23. However, since such a connection structure requires the cord 20 and the terminal 22, there is a problem that the number of components and the number of assembly steps for connection increase, and the manufacturing cost increases. Further, since the terminal 22 needs to be fixed to the lid 3 with the screw 26, the number of parts and the number of assembling steps are further increased, which is not suitable for automatic assembling. Furthermore, the conventional capacitor 2
When the motor 5 is built in the motor, since it is connected to the positive and negative wiring terminal plates 16 and 17, the number of steps for assembling the brush holder 13 increases, and the brush holder 13 has a space for mounting the capacitor 25. There is a need to.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to reduce the number of parts and the number of assembling steps, thereby reducing the manufacturing cost, and at the same time, making the direct current capable of automatic assembly. It is to provide a motor.

[0012]

According to a first aspect of the present invention, there is provided a rotor having a commutator fixed to a rotating shaft and an armature and housed in a bottomed cylindrical metal case. A brush holder made of synthetic resin for holding a plurality of power supply brushes through which the rotating shaft penetrates and slidably contact the commutator; and a plus side and a minus side attached to the brush holder and electrically connected to the power supply brushes. Side wiring terminal plate, and a metal lid member for covering the opening of the case, a connector is externally attached to the lid member, and one ends of the plus and minus terminals are respectively projected into the case. Along with the protruding end, the plus and minus wiring terminal plates and electrical components are connected,
The negative-side wiring terminal plate is grounded via the lid member.

According to a second aspect of the present invention, in the first aspect,
A housing is provided at an end of the connector on the side of the lid member for receiving an electric component facing the inside of the case.

In the first aspect of the present invention, the terminal of the connector is directly connected to the positive and negative wiring terminal plates to connect the motor side cord and the positive and negative wiring terminal plates. No terminals are required. Therefore, the number of parts and the number of assembly steps can be reduced, and automatic assembly can be performed. Also, since the electrical components are connected to the terminal of the connector, it is not necessary to connect to the positive and negative wiring terminal boards.
The number of assembly steps of the brush holder can be reduced. A radio noise preventing capacitor or the like is used as the electric component.

According to the second aspect of the present invention, since the connector is provided with the storage portion for storing the electric components, it is not necessary to secure a mounting space for the electric components on the brush holder side.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a sectional view showing an embodiment of a DC motor according to the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a rear view of a brush holder, and FIG. It is. In these drawings, the same components as those shown in the section of the related art are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In this embodiment, an example is shown in which the present invention is applied to a DC motor for adjusting the vehicle height which is mounted on an automobile.

The DC motor 21 includes a motor case 4 having a bottomed cylindrical case 2 made of a ferromagnetic material and a lid member 3 fitted and welded to an opening of the case 2. A rotor 5, a plurality of permanent magnets 6, a power supply brush 7, and the like are rotatably disposed via two bearings 8 therein. The lid member 3 is made of aluminum,
Manufactured by die casting. The rotor 5 includes a rotating shaft 9 and an armature 11 mounted on the rotating shaft 9.
A coil winding 10 is wound around the armature 11 and connected to the commutator 12.

The power supply brush 7 is housed in four brush housings 14 integrally provided at 90 ° intervals in the circumferential direction so as to surround the commutator 12 on the surface of the brush holder 13 so as to be movable forward and backward. And is pressed against the outer peripheral surface of the commutator 12 by a spring 15. Each power supply brush 7 is electrically connected via a pigtail 18 to plus and minus wiring terminal plates 16 and 17 attached to the back side of the brush holder 13. The pigtail 18 is connected to the power supply brush 7 and the terminal plate 1 by welding.
6 and 17, respectively.

One end of each of the positive and negative wiring terminal plates 16 and 17 is bent at a substantially right angle in the direction of the armature 11 so as to pass through a hole 30 (FIGS. 1 and 3) provided in the brush holder 13. The commutator 12
Bent portions 16a and 17a are provided substantially in parallel with each other.
These bent pieces 16a and 17a are connected to the plus and minus terminals 27 and 28 of the connector 23 by welding, respectively. The negative wiring terminal plate 17 is fixed to the lid member 3 together with the brush holder 13 by a plurality of screws 31. Further, the lid member 3 and the negative wiring terminal plate 17 are grounded to the vehicle body by a ground screw 32.

The connector 23 comprises a connector body 35 formed of a synthetic resin, and the plus and minus terminals 27 and 28 incorporated in the connector body 35. The connector body 35 is
It has an L-shape by being composed of a bottomed tubular base 35A and a bottomed tubular connecting portion 35B integrally and connected so as to be orthogonal to one side of the base 35A.
Are fitted into fitting holes 36 provided in the cover member 3 from outside the cover member 3 and are fixed by a plurality of screws 37 (FIG. 4). Inside the base 35A, a storage section 40 for storing the electric component 25 such as a radio noise prevention capacitor is formed. The storage section 40 communicates with the inside of the case 2. The connection portion 35B protrudes to the side of the lid member 3, and a connector of a power-supply-side cord (not shown) is inserted and connected into the recessed portion 41.

The plus and minus terminals 2
7, 28 are formed in an L shape by bending a metal plate, one end of which protrudes from the storage portion 40 of the base 35A, penetrates the hole 30 of the brush holder 13, and is inserted into the case 2, and And terminal board 1 for negative wiring
The electric parts 25 are connected to the bent parts 16a, 17a of Nos. 6, 17 by welding. On the other hand, the other end is located in the concave portion 41 of the connecting portion 35B. The plus and minus terminals 27 and 28 and the connector body 35 are integrally formed by insert molding.

In the DC motor 21 having such a structure, the connector 23 is directly attached to the lid member 3, and the plus and minus wiring terminal plates 16, 17 and the plus and minus terminals 27, 28 are directly welded. The connection eliminates the need for the motor-side cord 20, the terminal 22, and the screw 26 (FIG. 5), which are conventionally required, thereby reducing the number of parts, the number of assembly steps, and the manufacturing cost.

Further, the reduction in the number of parts and the number of assembling steps facilitates automatic assembling, thereby improving productivity. In this case, the connector 23 is fixed to the lid member 3 with screws 37, and then the electric component 25 is welded to the plus and minus terminals 27, 28.
The spring 18 and the positive and negative wiring terminal plates 16,
The brush holder 13 with the attached 17 is fixed to the lid member 3 with screws 31 and the minus wiring terminal plate 17 and the lid member 3 are electrically connected with the ground screw 32. Next, for the plus and minus wirings Terminal board 16,1
7 and the plus and minus terminals 27 and 28 are welded, and then the rotor 5 is housed in the case 2 and each end of the rotating shaft 9 is supported by the bearing 8. Thereafter, the lid member 3 may be fitted into the opening of the case 2 and welded.

Further, according to the present invention, since the capacitor 25 as an electric component is housed in the housing portion 40 provided in the connector 23, there is no need to secure a mounting space for the capacitor 25 on the brush holder 13 side. The configuration and assembly work of the brush holder 13 can be simplified.

In this embodiment, an example in which the present invention is applied to a DC motor for adjusting the height of an automobile has been described. However, the present invention is not limited to this, and the present invention is applied to a DC motor used for various applications. It is possible to apply to:

[0026]

As described above, the DC motor according to the present invention does not require a motor-side cord and terminals for connecting this cord to the plus and minus wiring terminal boards as in the prior art. Therefore, the structure is simple, the number of parts, the number of assembling steps and the manufacturing cost can be reduced, and the automatic assembling is facilitated.

Further, according to the present invention, since the housing is provided with the housing for storing the electronic element, there is no need to mount electric parts on the brush holder or secure a mounting space, and the brush holder can be easily assembled.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a motor according to the present invention.

FIG. 2 is a view taken in the direction of the arrow A in FIG. 1;

FIG. 3 is a rear view of the brush holder.

FIG. 4 is a cross-sectional view showing a mounting structure of the connector.

FIG. 5 is a sectional view of a conventional DC motor.

FIG. 6 is a right side view partially broken away.

FIG. 7 is a view illustrating a brush holder, a power supply brush, and a terminal plate for plus and minus wirings.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... DC motor, 2 ... case, 3 ... lid member, 4 ... motor case, 6 ... permanent magnet, 7 ... power supply brush, 9 ... rotating shaft,
DESCRIPTION OF SYMBOLS 11 ... Armature, 12 ... Commutator, 13 ... Brush holder 16a ... Positive side wiring terminal plate, 17a ... Minus side wiring terminal plate, 21 ... DC motor, 23 ... Connector, 2
5: condenser, 27: plus terminal, 28: minus terminal, 40: storage unit.

Claims (2)

[Claims] 1. A rotor housed in a bottomed cylindrical metal case having a commutator and an armature mounted on a rotating shaft and a plurality of rotors penetrated by the rotating shaft and slidably contacting the commutator. A brush holder made of a synthetic resin for holding the power supply brush, a plus side and a minus side wiring terminal plate attached to the brush holder and electrically connected to the power supply brush, and a metal cover for covering the opening of the case. A lid member, a connector is externally attached to the lid member, one ends of the plus and minus terminals are respectively projected into the case, and the plus and minus wiring terminal plates and the electrical A DC motor, wherein components are connected, and the negative wiring terminal plate is grounded via the lid member. 2. The DC motor according to claim 1, further comprising a storage portion provided at an end of the connector on the cover member side, the storage portion facing the inside of the case and storing the electric component.