JPH10201163A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a yoke cover smoothly while touching a yoke tightly by making a through hole on the open end side at the tubular part of a yoke and an air vent in the bottom thereof thereby forming an air channel for discharging the air from the space between the yoke cover and the bottom of the yoke. SOLUTION: An armature shaft 2 and a base unit 10 fixed with respective members, including a brush 12, are built in the yoke of a motor 1 and then stopped to a pump bracket 7 using set bolts before a waterproof cover 15 is fitted to the yoke 5. The yoke 5 is provided, in the tube bottom face thereof, with an air vent 5c and, on the open end side of the tubular section, with a through hole 5d for inserting a coupler. When the waterproof cover 15 is fitted to the yoke 5, the air in the waterproof cover 15 is discharged from the air vent 5c through an air channel via the through hole 5d as the cover 15 is pushed into the yoke 5. Consequently, the yoke cover can be fixed smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an electric motor used for electric components mounted on a vehicle.

[0002]

2. Description of the Related Art Generally, some electric motors of this kind include:
Depending on the place where it is arranged, a waterproof or corrosion-resistant treatment may be required. In such a case,
The electric motor is provided with waterproof performance and corrosion resistance performance. For this reason, a bottomed cylindrical yoke in which an armature shaft is provided and whose open end is fixed to a bracket is provided with a shape corresponding to the yoke shape. There is one that is covered with a bottom cylindrical yoke cover. In this case, as shown in FIG. 8, the yoke cover 15 is formed integrally with the bottom of the yoke 18 so as to completely cover the bottom of the yoke 18 and the cylindrical portion. It is fitted from the side.

[0003]

However, in this case, when the opening end of the yoke cover is pressed against the bottom of the yoke and pushed in, the yoke cover is pushed into the yoke because there is no rapid escape of the air in the yoke cover. As a result, there has been a problem that the pressure is increased and the workability of the fitting operation is deteriorated. In order to avoid this, it is conceivable that the inner diameter of the yoke cover is made larger than the outer diameter of the yoke, a gap is formed between the yoke cover and the yoke, and this gap is secured as an escape route for air. However, in this case, it is not a forgiveness that impairs lightweight and compact,
In the work of fitting the yoke cover, there is a problem that a misalignment occurs and a smooth work of fitting is impaired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve these problems in view of the above situation, and has an armature shaft provided therein and an open end fixed to a bracket. In covering the bottomed cylindrical yoke to be covered with a bottomed cylindrical yoke cover corresponding to the yoke shape, a through-hole is opened at an opening end side of the yoke at the opening of the cylinder, and an air hole is opened at the bottom. An air flow path for discharging air between the yoke cover and the bottom of the yoke when the yoke cover is fitted to the yoke is formed. Thus, the yoke cover in close contact with the yoke can be mounted smoothly. In this one,
The through-hole according to the present invention can be a through-hole for inserting an external draw-out coupler electrically connected to the commutator of the armature shaft, thereby achieving the dual purpose.

[0005]

FIG. 1 shows an embodiment of the present invention.
7 through FIG. In the drawings, reference numeral 1 denotes an electric motor for an anti-lock brake device. The electric motor 1 includes an armature core 3 which rotates integrally with an armature shaft 2 and a yoke 5 having a permanent magnet 4 fixed to an inner peripheral surface thereof. It is configured to be installed inside. An eccentric output shaft portion 2a is formed at the end of the armature shaft 2, and a piston rod for a brake device is connected to the eccentric output shaft portion 2a. Has become.

The yoke 5 has a cylindrical shape with a bottom, and a small-diameter cylindrical portion 5a is formed on the bottom surface of the yoke 5 so as to protrude outward. The base end of the armature shaft 2 is connected to the yoke 5 via a bearing 6 here. It is rotatably mounted. On the other hand, reference numeral 7 denotes a pump bracket which is assembled in abutting manner so as to cover the opening of the yoke 5. The pump bracket 7 is formed in a square tubular shape having an inner tubular portion 7a formed in the center. 7a, the tip of the armature shaft 2 is set so as to be rotatably supported via a bearing 8. And the yoke 5
The open end is sealed against the base side surface of the pump bracket 7, and is inserted into a pair of set bolt through holes 5 b, 5 b diametrically opened on the outer diameter side of the bottom surface of the yoke 5. It is set so that the electric motor 1 can be assembled into the pump bracket 7 by fastening with the set bolt 9. Further, a circular air hole 5c in which the present invention is implemented is formed on the bottom surface of the cylinder of the yoke 5 at an outer diameter side located between the set bolt through holes 5b and 5b. The connection between the eccentric output shaft portion 2a at the tip of the armature shaft 2 and the piston rod for the brake device (not shown) is set to be performed in the inner cylinder portion 7a of the pump bracket 7.

On the other hand, a base unit 10 is mounted on the distal end side of the yoke 5 with the distal end surface along the proximal end surface of the pump bracket 7, and a shaft through hole 10 a formed in the center of the base unit 10 is formed. The commutator 2b provided at the tip of the armature shaft 2 is set to penetrate. The base unit 10 is integrally formed with a pair of brush holders 11 each having an opening on the side of the armature shaft 2, and a brush 12 whose tip is in sliding contact with the commutator 2 b is provided inside the base unit 10 so as to be freely retractable. further,
On the outer diameter side of the base unit 10, through holes 10b and 10b through which the pair of set bolts 9 penetrate are formed, and a concave coupler supporting groove 10c is integrally formed at one of the through hole 10b forming portions. It is set so that the tip of a coupler 13 described later is inserted here. Reference numeral 12a denotes a coil bullet that urges the tip of the brush 12 to come into sliding contact with the commutator 2b.

Reference numeral 14 denotes a pair of terminal holders. Each of the terminal holders 14 is formed with a terminal holding portion 14a which opens toward the outer diameter side, and is drawn out from each brush 12 here. The inner terminal side half of the internal terminal plate 12c to which the pigtail 12b is connected by means such as soldering is housed and supported. Here, the outer diameter side half portion of the pair of internal terminal plates 12c exposed to the outer diameter side from the terminal holding portion 14a protrudes long toward the coupler supporting groove 10c side. Are arranged in a positional relationship to face each other while being sandwiched in the circumferential direction with a slight gap from the set bolt 9. Here, each brush 12 is assembled as a single assembly with a pigtail 12b and an internal terminal plate 12c. In this case, each brush 12 has a pigtail 12 of substantially the same length.
b may be connected, so that a pair of brushes 1
2 are assembled using the same assembly. The pigtail 12b is routed between the brush 12 and the terminal holder 14 while being guided by each guide piece 10d formed on the base unit 10.

Reference numeral 15 denotes a resin waterproof cover (yoke cover) covered by the yoke 5, and the waterproof cover 15 is formed in a bottomed cylindrical shape corresponding to the outer shape of the yoke 5.
The opening edge portion 15a is set so as to be assembled with the yoke 5 edge portion on the base end surface of the pump bracket 7 via a sealing material S in a sealed manner. On the other hand, each of the cylindrical portions of the yoke 5 and the waterproof cover 15 is provided with a substantially rectangular through-hole
d and 15b are respectively formed in the aligned state. Of these two through-holes 5d and 15b, the cover-side through-hole 15b is connected to the through-hole 15b, and has a square cylindrical locking cylinder 15c set to have a larger outer diameter than the through-hole 15b. Are formed so as to project outward.
Here, the waterproof cover 15 is fitted into the yoke 5 by assembling. The waterproof cover 15 projects the open end of the yoke 5 in which the above-described members are incorporated into the pump bracket 7, and pushes the pump bracket 7 with the set bolt 9. It is set to be attached to the yoke 5 fixed to the pump bracket 7. And
The waterproof cover 15 is provided with the through hole 15 b and the through hole 5 of the yoke 5.
d is set in the aligned state, the opening edge 15a is applied to the bottom surface of the yoke 5, and the waterproof cover 15 is pushed in as it is, the through holes 15b and 5d are aligned, and the edge 15a When the water comes into contact with the pump bracket, the fitting operation is completed. At this time, the air between the inside of the waterproof cover 15 and the bottom surface of the yoke 5 is filled with the air holes as the waterproof cover 15 is pushed in. It is set so that the waterproof cover 15 is discharged from the air passage 5c to the outside through an air flow path passing through the through hole 5d for inserting the coupler 13, and the waterproof cover 15 is smoothly inserted into the yoke 5.

On the other hand, the coupler 13 is located on the distal end side and has a substantially rectangular thin cylindrical portion 13a fitted inside the through holes 5d and 15b. A thick cylindrical portion 13b that is internally fitted to and supported by the locking cylinder 15c is integrally formed with a stepped surface portion 13c, and the distal end of the narrow cylindrical portion 13a branches into a forked shape to form a square cylindrical shape. The terminal support 13d is formed on the terminal support 13d.
Further, a pair of external terminal plates 16 for electrically connecting to the internal terminal plate 12c are respectively fitted and supported. Then, the coupler 13 inserts the coupler thin tube portion 13a into the yoke 5 through the through holes 5b and 15b with the waterproof cover 15 fitted therein, and inserts the coupler thin tube portion 13c into the coupler support groove 10c of the base unit 10. The connection with the internal terminal plate 12c is made. Incidentally, in this connection state, the branch portion between the two terminal support portions 13d is formed in a substantially U-shape, and is in a state of straddling the set bolt 9 penetrating the base unit 10, whereby the internal terminal plate 12c And the set bolt 9 are insulated. The power supply to the brush 12 is performed by connecting a power supply lead wire (not shown) to the outside of the coupler 13 assembled as described above.

Further, in this inserted state, the step 13c between the narrow cylindrical portion 13a and the thick cylindrical portion 13b of the coupler 13 is formed between the through hole 15b on the waterproof cover 15 side and the locking cylinder 15c. It is set so as to abut against the step 15d in a sealing manner via the sealing material S. On the other hand, in this assembled state, the coupler 13 and the waterproof cover 15 are provided with a pair of locking claws 13e formed on a pair of opposed side surfaces of the thick cylindrical portion 13b.
The coupler 13 is set so as to be engaged with the cover 13 so that the coupler 13 is prevented from falling out of the waterproof cover 15.

In the embodiment of the present invention configured as described above, the electric motor 1 includes a yoke 5 incorporating an armature shaft 2 and a base unit 10 on which members such as a brush 12 are mounted. A waterproof function is provided by attaching the waterproof cover 15 to the yoke 5 in this set state by fixing the yoke 5 to the pump bracket 7 using the set bolt 9. Since the air hole 5c is opened in the bottom of the cylinder and the through-hole 5d for inserting the coupler 13 is opened in the opening end portion of the cylinder, when the waterproof cover 15 is fitted to the yoke 5, As the air inside the waterproof cover 15 is pushed into the yoke 5, the air is discharged from the air passage through the air hole 5c and the through hole 5d. As a result, the escape path of the air in the waterproof cover 15 is reduced, as in the case where the air is exhausted from the gap between the cylindrical portion of the conventional yoke 5 and the waterproof cover 15, or the yoke 5 and the yoke cover 15 Smooth fitting work such as misalignment is not impaired. Moreover, according to this embodiment, the waterproof cover 15 in a close contact state in which the inner diameter of the waterproof cover 15 is almost equal to the outer diameter of the yoke 5 can be smoothly fitted, which contributes to the reduction in weight and size and the workability. You can measure improvement.

Further, the insulation between the set bolt 9 and the internal terminal plate 12c in this case is provided by both inner side surfaces of the rectangular tubular terminal support portion 13d of the coupler 13 formed so as to straddle the set bolt 9. As a result, the insulation with the set bolt 9 can be surely measured without taking special measures such as using a special member.

In this case, the connection between the coupler 13 penetrating the inside and outside of the yoke 5 and the internal terminal plate 12c is
The coupler 13 can be attached in a retaining shape by one-touch operation only by inserting, and the assembling work is easy and the work can be simplified. Therefore, when a load is applied in the circumferential direction of the coupler, the load passes through the yoke 5 instead of the terminal holder 14 holding the internal terminal plate 12c, that is, the base unit 10 side. Since the coupler 13 is mainly received by the supported set bolt 9, it is possible to prevent rattling of the coupler 13 in the circumferential direction.

In addition, the coupler 13 is configured to be inserted from the cylindrical portion of the yoke 5 and the waterproof cover 15, and the supporting portion for preventing the coupler 15 from coming off in this case is a locking cylinder 15c. The axial external load acting on the coupler 13 is mainly received on the waterproof cover 15 side, not on the base unit 10 side where the brush holder 11 is provided. Even in this case, a large load acts on the base unit 8 side. This avoids the need for extra strength of the base unit 10,
This can contribute to miniaturization of the electric motor.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of an electric motor.

FIG. 2 is a side view showing a fitted state of a waterproof cover.

FIG. 3 is a front view of a base unit showing a connection state with a coupler.

FIG. 4 is a front view showing a state where a coupler is inserted into a waterproof cover.

FIG. 5 is a side view of the waterproof cover.

FIG. 6 is a side sectional view of a waterproof cover.

FIG. 7 is a rear view of the waterproof cover.

FIG. 8 is a side view showing a conventional example in which a waterproof cover is fitted.

[Explanation of symbols]

 Reference Signs List 1 electric motor 2 armature shaft 5 yoke 5c air hole 5d through hole 7 pump bracket 9 set bolt 10 base unit 11 brush holder 12 brush 13 coupler 14 terminal holder 15 waterproof cover 15b through hole

Claims (2)

[Claims] When closing a bottomed cylindrical yoke in which an armature shaft is housed and an open end is fixed to a bracket with a bottomed tubular yoke cover corresponding to the shape of the yoke, the yoke tube is provided. A through hole is provided on the opening end side and an air hole is provided on the bottom, and an air flow path for discharging air between the yoke cover and the yoke bottom when the yoke cover is fitted to the yoke is formed. Electric motor. 2. The electric motor according to claim 1, wherein the through-hole is a through-hole for inserting an external draw-out coupler electrically connected to a commutator of the armature shaft.