JPH0635649Y2 - External pull-out structure of pigtail in motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an external drawing structure of a pigtail in a motor incorporated in a device such as an electrical component.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of motor, a pigtail (lead wire) extending from the brush needs to be drawn out of the case. Therefore, conventionally, as shown in Japanese Utility Model Laid-Open No. 58-150355, two pigtails were put together into one piece, and a grommet supported by a case was made to pass through and pulled out to the outside. Is not supported by a stable structure on the grommet side via a pigtail, and as a result, violent vibrations etc. also vibrate this gathered part, which causes the pigtail to move. Is likely to cause metal fatigue and break the wire after a long period of time. It also requires work to put together the pigtails, which is inferior in workability, and the welding work can be done by welding (spot welding, etc.). In the case where the welding is carried out, there arises a problem of ensuring reliability due to variations in welding, and for this purpose, there is a drawback that welding of excessive quality must be performed.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing an external pull-out structure of a pigtail in a motor capable of eliminating these drawbacks. To extend the pair of pigtails extending from the penetrating grommet supported by the motor case to the outside,
It is characterized in that both the pigtails are clamped and held by a pigtail holder to be bundled, and the bundled tip side is made to penetrate through a grommet and pulled out to the outside, and the pigtail holder is inserted and held in an insertion hole of the grommet. It is a thing.

Further, according to the present invention, with this configuration, the pigtail is directly supported by the grommet using the pigtail holder and pulled out to the outside, so that the reliability is high and the assembling is easy. .

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a motor, and the motor 1 is configured such that a magnet is provided on an inner peripheral surface of a yoke 2 and a rotor 3 is rotatably supported inside the magnet. 4 is a brush stay, and the brush stay 4 is a rear bracket 5
The brush 7 is fixed inside the brush holder 6 provided in the brush stay 4 so that the brush 7 can be retracted.
The brush 7 is urged toward the shaft center side by an elastic machine 8 so as to elastically press the commutator 3a of the rotor 3.

Pigtails 9 extend from the brushes 7, but the two negative sides of the pigtails 9 are fixed to the rising side 4 a provided on the brush stay 4. On the other hand, the two positive-side pieces are configured to penetrate the grommet 10 and be drawn to the outside. That is, the grommet 10 is formed with an engagement groove 10a for fitting and locking the rear bracket 5 and an engagement groove 10b for fitting and locking the brush stay 4, respectively. Further, a holder insertion hole 10c is formed. Reference numeral 11 denotes a pigtail holder which is inserted and held in the holder insertion hole 10c, and a pair of clamp pieces 11a is formed on both left and right sides of the holder 11 so as to project therefrom. The pigtails 9 from both the left and right sides are supported by bending and holding the clamp pieces 11a in a clamped manner, and the pigtails 9 are individually bundled at the center of the holder. The formed product penetrates the through hole 10d of the grommet 10 and is drawn to the outside. By the way, the tip of the pigtail 9 is fixed to the lug 12 by spot welding,
The wiring structure is connected to the battery via an electromagnetic switch (not shown) that connects the lug 12.

In the embodiment of the present invention configured as described above, the pigtail 9 penetrating the grommet 10 and being drawn out to the outside of the motor is converged while being clamped by the pigtail holder 11 in a clamped state, and the tip end side of the grommet 10 is fixed. Penetrate.
Moreover, the pigtail holder 11 is inserted into and held by the grommet 10.

As a result, in each pigtail 9, not only the focusing portion but also the brush 7 side and the side penetrating the grommet 10 are directly supported by the grommet 10 via the pigtail holder 11. Therefore, when the motor vibrates violently, the pigtail 9 is prevented from vibrating in the focusing portion as in the conventional case, and is held by the support structure integrated with the grommet. Therefore, the possibility of disconnection due to metal fatigue of the pigtail can be prevented and the reliability can be improved over a long period of time. In addition, since the pigtails 9 are bundled and clamped by using the pigtail holder 11 instead of welding, the assembling work is not easy and the quality is extremely high. Even if you do not, you can make a highly reliable pigtail drawer structure and further
Even if an external force acts on 10, the pigtail 9 in the motor will not be acted on, and will be reliably protected.

Moreover, when connecting the lug 12 to the electromagnetic switch, the lug 12
The length of the pigtail 9 is made longer than the distance from the motor to the electromagnetic switch to facilitate connection, but at this time, in the present invention, the pigtail holder 11
Since there is a supporting action by, it is possible to eliminate the problem that the pigtail is loosened in the motor and comes into contact with the commutator.

When carrying out the present invention, if there is a risk that the pigtail directly hits the pigtail holder and is broken,
It suffices to use a pigtail covered with a tube material such as a glass tube, and by doing so, it is possible to make it more reliable.

[Operation and Effect] In short, since the present invention is configured as described above, the pigtails extending from the left and right are clamped and held by the pigtail holder, and the converged tip side penetrates the grommet. The pigtail holder is inserted through and held by the grommet, and the clamped pigtail is integrally supported by the grommet. As a result, the pigtail is supported by the grommet directly on the brush side and the grommet penetration side through the pigtail holder on the basis of the converging part, so that there is no unstable state as in the conventional case. Therefore, if the motor vibrates violently,
As a result, the problem that the focusing part also vibrates is prevented, and the pigtail can be prevented from problems such as disconnection and slack in the motor, and the work to assemble the pigtail to pull it out is also simplified. Therefore, the workability can be improved and the quality can be made uniform, and a highly reliable product can be provided in large quantities at a low cost.

[Brief description of drawings]

FIG. 1 shows an embodiment of an external pullout structure for a pigtail in a motor according to the present invention. FIG. 1 is an exploded perspective view of an essential part of the motor, FIG. The drawing is an exploded perspective view showing an assembled state of the pigtail holder. In the figure, 1 is a motor, 7 is a brush, 9 is a pigtail, 10 is a grommet, and 11 is a pigtail holder.

Claims (1)

[Scope of utility model registration request] 1. When a pair of pigtails extending from a brush are pulled out through a grommet supported by a motor case, the pigtails are clamped and held by a pigtail holder to be converged, and the converging tip side is attached to the grommet. An external pull-out structure of a pigtail in a motor, characterized in that the pigtail holder is penetrated and pulled out to the outside, and the pigtail holder is inserted and held in an insertion hole of a grommet.