JPH0628932Y2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a motor, and in particular, it is configured to prevent electrical noise from leaking by electrically connecting a ground terminal of a circuit board installed therein to a motor case or the like. Regarding motors.

2. Description of the Related Art Generally, in a motor, electric noise is generated at a contact portion between a brush and a commutator. Therefore, the motor case is grounded to prevent the electric noise from leaking to the outside.

Conventionally, as a structure for performing this grounding, a jumper wire 1 is used as shown in FIG. 5, one end of this jumper wire 1 is welded (spot welded) to a motor case 2, and the other end is internally inserted into the motor 3. The motor case 2 is grounded by soldering it to the ground terminal 4a of the circuit board 4 provided. In addition, reference numeral 5 in the drawing denotes a metal cover, which is press-fitted into the motor case 2 after the jumper wire 1 is attached to surely prevent leakage of electrical noise.

However, the conventional motor described above has a problem in that the jumper wire 1 is required to ground the motor case 2 and the number of parts is increased. In addition, a step of welding the jumper wire 1 to the motor case 2 and a step of soldering the jumper wire 1 to the circuit board 4 are required, which causes a problem that the assembly process becomes complicated. Further, since the jumper wire 1 is a relatively short linear member, there is a problem that it is difficult to handle in the welding and soldering steps.

The present invention was created in view of the above points, and an object of the present invention is to provide a motor in which the motor case can be easily grounded.

Means for Solving the Problems In order to solve the above problems, according to the present invention, a motor case having a rotor part incorporated therein is attached to the motor case, and the power source extends outside the motor case and is connected to the motor case. Circuit board provided with an extending portion formed with a power supply ground terminal, a hole formed in the power supply ground terminal so that a lead wire can be inserted from the outside, and a cover for closing the motor case. In the motor having the above-mentioned structure, a protrusion is integrally formed on the cover for electrically connecting to the power source ground terminal formed on the extending portion, and the protrusion, the power source ground terminal, and the lead wire are formed. And are simultaneously soldered.

By configuring the motor as described above, the protruding portion integrally formed with the cover is directly electrically connected to the power supply ground terminal, and the protruding portion, the power supply ground terminal, and the lead wire are simultaneously soldered. The case and cover can then be connected to the ground of the electrical circuit.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. First
2 and 2 show a motor 6 which is an embodiment of the present invention. 1 is an exploded perspective view of the motor 6, and FIG. 2 is a circuit board 16 installed in the assembled motor 6.
FIG. 6 is a vertical cross-sectional view showing a state in which a lead wire 7 is soldered to the.

In the figure, 8 is a metal (for example, iron) motor case, which has a bottomed tubular shape. This motor case 8
Inside is a magnet 9 (shown in satin), a rotor 10, and a rotating shaft 1.
1, a commutator 12, a brush 13 and the like (each shown in FIG. 2) are provided with a rotor 14. The rotating body 14 has a well-known structure, and the rotation of the rotating body 14 causes electrical noise in the sliding contact portion between the commutator 12 and the brush 13 as described above. Reference numeral 15 denotes a resin cap member, which defines a rotating body 14 and a circuit board 16 described below in the motor case 8. Also,
The outer peripheral upper end surface of the cap member 15 is formed to be slightly higher than the upper end surface of the circuit board 16.

The circuit board 16 is provided with an electronic component 17 for controlling the rotation of the rotating body 14 on the back side and the leads 1 on the front side.
8 is printed and wired. The circuit board 16 is formed into a substantially circular shape, but an extension portion 16a extending in the radial direction is formed at a part thereof, and the lead wire 7 for supplying a current to the motor 6 is formed in the extension portion 16a. A grounding terminal 18a and a plus terminal 18b to which is soldered are formed. The circuit board 16 is mounted in the motor case 8, but the motor case 8 has a cutout portion 8a.
In the attached state, the extending portion 16a extends outward from the cutout portion 8a.

Reference numeral 19 denotes a metal cover, which is press-fitted into the opening 8b of the motor case 8 to open the lid after the circuit board 16 is attached. A flange portion 19a is formed on the cover 19 at a position corresponding to the cutout portion 8a of the motor case 8, and at a position facing the ground terminal 18a formed on the extending portion 16a, the present invention is provided. A protruding portion 19b which is a main portion is formed. This protruding portion 19b is the cover 1
It is formed simultaneously and integrally at the time of molding (press molding) 9, but it is slightly bent toward the lower surface of the cover 19, and there is no difficulty in forming the protrusion 19b.

As described above, the cover 19 covers the opening 8b of the motor case 8.
It is press-fitted into and fixed to, and this fixed state is shown in FIGS. 2 and 3. As shown in each drawing, the protruding portion 19b formed on the cover 19 in the attached state is in pressure contact with the ground terminal 18a formed on the extending portion 16a and is electrically connected thereto. On the other hand, the motor case 8
Both the cover 19 and the cover 19 are made of a conductive metal, and the cover 19 is in pressure contact with the motor case 8 so that electrical continuity is established. However, the collar portion 19a is provided on the circuit board 16
Are slightly separated from each other so that the ground terminal 18a and the positive terminal 18b are not short-circuited.

In addition, a hole 20 into which the lead wire 7 for grounding is inserted is provided at a position near the protruding portion 19b of the extending portion 16a.
The ground terminal 18a and the lead wire 7 are provided at positions where soldering can be performed simultaneously. Therefore, the motor case 8 and the cover 19 are grounded by being electrically connected to the ground terminal 18a, and the commutator 12 and the brush 1 are connected.
It is possible to reliably prevent leakage of electrical noise generated during the period 3 to the outside. Furthermore, the work process of press-fitting the cover 19 into the motor case 8 is a process that has been conventionally performed. In this press-fitting process, the cover 19 is attached to the motor case 8, and the motor case 8 and the ground terminal 18a of the cover 19 are connected. You can do two tasks at the same time with the connection. As a result, the work process can be simplified.

Further, when the motor 6 having the above-mentioned configuration is mounted, the lead wire 7 connected to the power source is soldered to the ground terminal 18a and the positive terminal 18b, but at this time, the protrusion 19b is located at a position facing the ground terminal 18a. Therefore, as shown in FIG. 2, the protruding portion 19b, the ground terminal 18a, and the lead wire 7 are soldered at the same time. Therefore, even if the protruding portion 19b and the ground terminal 18a are separated from each other when the cover 19 is press-fitted, the ground terminal 18a can be mounted at the time of mounting.
The protrusion 19b and the projection 19b are reliably electrically connected by soldering.

Effect of the Invention According to the motor of the present invention as described above, since the protruding portion connected to the ground terminal is integrally formed with the cover, a component for grounding jumper wires or the like that has been conventionally required is provided. Is unnecessary, the number of parts can be reduced, and a jumper wire etc. is covered or a motor case,
Also, the step of connecting to the power supply ground terminal can be eliminated. Further, since the projecting portion, the power supply ground terminal and the lead wire are soldered at the same time, the work efficiency can be improved, the product cost can be reduced and the assembling work process can be simplified. Have.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a motor according to an embodiment of the present invention,
2 is a vertical sectional view of the motor, FIG. 3 is a bottom view of the motor,
FIG. 4 is an exploded perspective view for explaining an example of a conventional motor. 6 ... motor, 8 ... motor case, 11 ... rotating shaft,
14 ... Rotating body, 16 ... Circuit board, 16a ... Extension part, 18a ... Ground terminal, 19 ... Cover, 20 ...
Hole.

Claims (1)

[Scope of utility model registration request] 1. A motor case in which a rotor part is incorporated, and an extension part attached to the motor case and having a power source ground terminal extending outside the motor case and connected to a power source. A motor comprising a circuit board provided, a hole formed in the ground terminal for power supply so that a lead wire can be inserted from the outside, and a cover for closing the motor case. A projecting portion for electrically connecting to the power source ground terminal formed in the extending portion is integrally formed, and the projecting portion, the power source ground terminal, and the lead wire are simultaneously soldered. Motor of different configurations.