JPH0139084Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Technical field of the invention The invention relates to a small motor, particularly a small motor in which a mechanically strong current-carrying motor terminal is fixed to a synthetic resin motor case and electrical connections are made at the same time. It is something.

(B) Background and problems of the invention Small motors are often incorporated into electrical equipment, etc., and their electrical connections or mechanical installations are highly reliable and durable, and they require direct electrical connection to the equipment in which they are incorporated. - Mechanical connection is desired.

Conventionally, motor terminals for energizing small motors have been manufactured in order to be small, simple in structure, lightweight, and inexpensive.
Molded together with the brush. Therefore, the motor terminal for energization and the brush have the same plate thickness. On the other hand, the brushes of the small motor come into contact with the commutator and maintain a predetermined contact pressure and contact area at all times, so the brushes are thinned and used in an appropriately bent state.
For this reason, a problem arises in that the current-carrying motor terminal, which has the same thickness as the brush, is mechanically weak and difficult to connect directly to other equipment. Furthermore, since the motor terminal for energizing is a thin plate, there is also a problem in that there are restrictions on the shape of the terminal when connecting it to other equipment.

(C) Purpose and structure of the invention The present invention fixes a mechanically strong energizing motor terminal to a synthetic resin motor case in a small motor, and at the same time makes an electrical connection with the brush. The purpose is to provide a motor terminal with strong mechanical strength and to enable direct connection to other equipment.

(D) Examples of the invention The invention will be explained below with reference to the drawings. 1st
The figure shows a partial sectional view of a conventional small motor.
The figure shows a partial sectional view of a small motor according to the present invention. In FIGS. 1 and 2, 5 is a fixture;
7 is a conventional motor terminal, 8 is a synthetic resin motor case, and 12 is a motor terminal according to the present invention.

In Figure 1, a conventional small motor has a rotating shaft 1.
The rotor 3 has a structure in which both ends of a rotor 3 to which a commutator 10 is attached are attached to a magnetic motor case 4 and a synthetic resin motor case 8 via bearings 2 and 9, respectively. The motor case 8 made of synthetic resin is further attached to the motor case 4 made of a magnetic material. The motor terminal 7 is projected to the outside through the terminal hole 6, and is fixed to a synthetic resin motor case 8 by a fixture 5 inside the motor.
The brush 11 is formed integrally with the motor terminal 7 and a thin plate, and supplies current to the commutator 10.

As shown in FIG. 2, the small motor according to the present invention has a new mechanically strong motor terminal 12, which is made of synthetic resin, instead of the conventional thin plate motor terminal 7 that is integrally molded with the brush 11. It has a structure in which it is fixed to the case 8 and electrically connected to the brush 11. This will be explained in detail below.

In FIG. 3, 12 is a motor terminal of a small motor according to the present invention. The motor terminal 12 includes a terminal part 16 for connecting to other equipment and a brush mounting base 1 provided in the synthetic resin motor case 8.
4 and a terminal base 17 having a fixing hole 21 for fixing to the terminal base 17 are integrally molded in an L-shape. This motor terminal 12 is made to protrude from the inside of the motor case 8 to the outside through a rectangular terminal hole 13 provided near the brush mounting base 14 of the motor case 8 made of synthetic resin. Then, the motor terminal 12 is attached to the brush mount 14 through the fixing hole 21 provided in the terminal base 17 of the motor terminal 12 using a fixture 18, for example, a rivet.
Fix it together with 5. A fixing hole 21 formed in the terminal base 17 of the motor terminal 12 is provided with a split 22 at one end to form a step 20, as shown in FIG. This step 20 utilizes the elasticity of the motor terminal member to perform a spring washer-like function to prevent loosening, and also prevents the brush base 1 from loosening.
It has the role of ensuring electrical connection by cutting into and contacting 5 with an edge. Further, the motor terminal 12 has a stepped portion 19 in which the width of the terminal portion gradually increases in a stepwise manner as the distance from the tip of the terminal portion 16 increases. This is the terminal section 16 of the motor terminal 12.
protrude from the inside of the synthetic resin motor case 8 to the outside through the rectangular terminal hole 13, and mechanically caulk 23 this stepped part 19 on the outside of the motor case 8 as shown in FIG. 5 to further secure the motor. terminal 12
It has the role of fixing the motor to the motor case 8.

Although the terminal portion 16 of the motor terminal 12 is shown as flat, it may have any other shape, such as a round shape or an open-end shape.

(E) Effect of the invention As explained above, according to the invention, the mechanically strong motor terminal 12 for energizing is fixed to the synthetic resin motor case 8 of a small motor, and at the same time electrical connection to the brush is made. As a result, mechanical strength of the motor terminal for energization can be ensured and electrical connection can be achieved with a simple structure and at low cost. In particular, since the motor terminal 12 is mechanically and firmly fixed from the inside and outside of the synthetic resin motor case 8, there is a great effect that the small motor can be directly mechanically and electrically connected to other equipment.

[Brief explanation of the drawing]

Fig. 1 shows a partial sectional view of a conventional small motor, Fig. 2 shows a partial sectional view of a small motor according to the present invention, and Fig. 3 shows a perspective view from inside the small motor of Fig. 2. , FIG. 4 shows the shape of the motor terminal 12 according to the present invention, and FIG. 5 shows a perspective view of the small motor of FIG. 2 from the outside. 5 is a fixture, 8 is a synthetic resin motor case, 1
1 is a brush, 12 is a motor terminal according to the present invention, 1
3 is a rectangular terminal hole, 16 is a terminal portion, 17 is a terminal base, 19 is a step, 20 is a step, and 23 is a caulking of the step.

Claims (1)

[Claims for Utility Model Registration] 1. A rotor 3 having a commutator 10 on one end side.
a rotating shaft 1 of the rotor 3; a cylindrical magnetic motor case 4 rotatably supporting the rotating shaft 1 of the rotor 3 via a bearing 2 and having magnetic poles on its inner wall; and the commutator in the rotating shaft 1 of the rotor 3. A cylindrical synthetic resin motor case 8 rotatably supports one end of the motor case 10 and is press-fitted into the magnetic motor case 4, and a terminal hole 6 provided in the synthetic resin motor case 8 is used for conducting electricity. In a small motor having a motor terminal 12, the synthetic resin motor case 8 is provided with at least two brush mounting bases 14 and at least two terminal holes 13, and a terminal portion for external connection is provided at one end. 16 and a fixing hole 21 for fixing at the other end, and a split 22 is inserted into a part of the fixing hole 21 to form a step 20.
An L-shaped motor terminal 12 is provided, and the terminal portion 16 of the motor terminal 12 is inserted into the synthetic resin motor case 8 through the terminal hole 13.
The motor terminal 12 is made to protrude from the inside to the outside of the motor case 8, and the motor terminal 12 is passed through the fixing hole 21 and attached to the brush mounting base 14 in the synthetic resin motor case 8 using a fixture 18.
A small motor characterized by being fixed. 2. The terminal portion 16 of the motor terminal 12 is provided with a stepped portion 19 in which the width of the terminal portion 16 gradually increases in a stepwise manner as the terminal portion 16 moves away from the tip, and the terminal portion 16 is inserted into the synthetic resin motor case through the terminal hole 13. 8 and protrude from the inside of the motor case 8 to the outside of the motor case 8, and caulk 23 the protruding step-like stepped portion 19.
A small motor according to claim 1, characterized in that: