JPH043576Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric motor, and particularly relates to an improvement in the attachment point of an electric cord.

[Prior Art] As shown in FIG. 4, the conventional installation location for the electric cord of this type of electric motor is as follows: A through hole 2 is provided in a motor cover 1, and an electric cord 4 is passed through the through hole 2 through a grommet 3. The tip of the electric cord 4 is connected to the brush holder 5 held on the motor cover 1 by soldering, or a crimp terminal (not shown) is attached to the tip of the electric cord 4 and the crimp terminal is fitted into the brush holder 5. It was connected by inserting it into the female part. However, if the electric cord 4 is simply passed through the through hole 2 of the motor cover 1 via the grommet 3, accidents often occur in which the electric cord 4 is pulled out of the through hole 2 and comes off from the brush holder 5. Ta.

Therefore, conventionally, as shown in FIG. 5, a terminal fitting hole 7 is provided in the brush plate 6 that holds the brush holder 5, and a crimp terminal 8 is provided which can be crimped onto the tip of the electric cord 4 and connected to the brush holder 5. is inserted into the terminal fitting hole 7 and the locking protrusions 7a and 8a provided on both the terminal fitting hole 7 and crimp terminal 8 are engaged with each other, and the crimp terminal 8 is removed from the terminal fitting hole 7. I was trying to stop it.

[Problems to be solved by the invention] In the electric motor as described above, when the electric cord 4 is pulled, the electric cord 4 may come off from the caulked part with the crimp terminal 8. 8, and the crimp terminal 8 must be electrically connected to the brush holder 5 through the terminal fitting hole 7 of the brush plate 6 for assembly, which increases the number of assembly steps and increases the cost. Ta.

An object of the present invention is to provide an electric motor that increases the mounting strength when an electric cord is pulled and is inexpensive by reducing the number of steps required to assemble the electric cord attachment part.

[Means for Solving the Problems] The present invention will be described with reference to FIGS. 1 to 3 showing embodiments thereof. The electric cord 4 is electrically connected to the brush 14 held in the brush holder 14. The output shaft 9 is supported by a synthetic resin brush plate 16 which is connected to the motor and has a brush holder 15, and a motor cover 12 is fixed to the brush plate 16. A first groove 17a is provided in the brush plate 16 in a direction parallel to the output shaft 9 on the side where the brush plate 16 is connected, and a first groove 17a is provided in the brush plate 16 in a direction perpendicular to the first groove 17a.
A cord insertion groove 17 is formed having a second groove portion 17b provided at 6, and the opening of the cord insertion groove 17 is closed by a cord presser 19.

[Function] In such an electric motor, the electric cord 4 is inserted into the bent cord insertion groove 17 of the brush plate 16.
Since the electric cord 4 is inserted into the brush plate 16 and held down by the cord presser 19, the electric cord 4 is held in the brush plate 16 in a bent state, thereby increasing the attachment strength of the electric cord 4 against tension. The number of steps required for assembling the attachment part 4 is reduced, and manufacturing can be done at low cost.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the electric motor of the present invention has a rotor 11 with an electric motor 10 attached to an output shaft 9 thereof. The armature 10 is housed in a motor cover 12. A commutator 13 is attached to the rotor 11, and a brush 14 is in contact with the commutator 13. The brush 14 is held by a brush holder 15, and the brush holder 15 is formed integrally with a brush plate 16 made of synthetic resin. The brush plate 16 bears the output shaft 9 and is disposed on the output side. The brush plate 16 has a circular base 16a, and a circular protrusion 16b is integrally formed on the armature 10 side of the circular base 16a, and the brush holder 15 is integrally formed with the circular protrusion 16b. Motor cover 12 side end 16c of circular base 16a of brush plate 16 and rising surface 16d of circular protrusion 16b
Two cord insertion grooves 17 are formed in parallel across the two. Each cord insertion groove 17 has a rising surface 1
The first groove portion 17 is formed to open at 6d.
a and the circular base 16 continuous to the first groove portion 17a.
A second groove portion 17b formed to open at a.
It is composed of. That is, the first groove portion 17a
are provided in a direction parallel to the output shaft 9, and the second groove portion 17b is continuously formed in a direction orthogonal to the first groove portion 17a. A partition portion 18 is formed between each cord insertion groove 17, and the surface of this partition portion 18 is formed lower than the surface of the end portion 16c of the circular base portion 16a. A cord presser 19 is fitted into each cord insertion groove 17 and partition portion 18 with the electric cord 4 inserted into each cord insertion groove 17. The cord presser 19 has a generally U-shaped cross section and is generally L-shaped as a whole.
The cord presser 19 has protrusions 19a located at both ends in the width direction that are inserted into the cord insertion grooves 17, and a bottom portion 19b located between the protrusions 19a abuts against the partition 18. The cord presser 19 formed in this way is inserted into the cord insertion groove 1.
7, the flange 12a is attached to the armature 10 side end surface 16c of the circular base 16a of the brush plate 16.
The motor cover 19 is screwed into contact with the motor cover 19. The protruding portion 19b at the left end of the motor cover 19 shown in FIG. 1 is a bearing portion for bearing the rotor 11. As shown in FIG.

[Effects of the invention] As described above, according to the invention, the electric cord is inserted into the bent cord insertion groove of the brush plate and held down by the cord presser, so that the electric cord is inserted into the brush plate in the bent state. This increases the tensile strength of the electrical cord.
Further, according to the present invention, there is an advantage that the number of steps required for assembling the attachment portion of the electric cord can be reduced, and the electric cord can be manufactured at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of an embodiment of the electric motor of the present invention, FIGS. FIG. 3 is a perspective view showing a cord presser related to the electric motor shown in FIG. 1, and FIGS. 4 and 5 are a side view and a sectional view of a main part of the conventional electric motor, respectively. 4... Electrical cord, 9... Output shaft, 12... Motor cover, 14... Brush, 15... Brush holder, 16... Brush plate, 17... Cord insertion groove, 17a... First groove, 17b...Second
Groove, 19... Cord presser.

Claims (1)

[Claims for Utility Model Registration] An electric cord is electrically connected to a brush held in a brush holder, an output shaft is supported by a synthetic resin brush plate having the brush holder, and a motor cover is attached to the brush plate. In the electric motor, the brush plate has a first groove provided in a direction parallel to the output shaft on the side facing the motor cover, and a first groove provided in a direction perpendicular to the first groove. An electric motor comprising: a cord insertion groove having a second groove provided in the brush plate continuous with the groove; and a cord presser for closing an opening of the cord insertion groove.