JP2759164B2 - Sealing structure of rotating machine casing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a casing of a rotating machine, and more particularly to a casing in which an opening side of a casing also serving as a yoke is fitted to an outer peripheral surface of a tubular spigot portion of a front bracket. A seal structure.

[0002]

2. Description of the Related Art A seal structure of a front bracket portion of a DC motor using a yoke formed by squeezing a magnetic steel plate is shown in FIG.
And as shown in FIG. That is, the yoke that also serves as the casing 1 is fitted to the outer peripheral surface of the cylindrical spigot portion 3 of the front bracket 2.

[0003] An O-ring 4 is used for sealing the joint, and the O-ring 4 is attached to the root portion on the outer peripheral side of the spigot portion 3 and the edge portion on the opening end side of the casing 1. I was trying to put it on. A brush 7 slidably held by a brush holder 6 held on an insulating plate 5 is brought into sliding contact with a commutator 9 mounted on a rotor 8 to thereby switch the current. I was

[0004]

According to such a structure, the brush holder 6 is arranged so as to face the inner peripheral surface of the casing 1 which also serves as a yoke. There is a problem that the size in the direction is restricted and the motor cannot be reduced in size. When the brush holder 6 is arranged on the outer peripheral side on the insulating plate 5,
There is a possibility that a short circuit may occur due to contact with the casing 1 or the waterproof structure may not be established.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it has been made possible to reduce the diameter of a motor, and to provide a short circuit in which a brush holder comes into contact with a casing which also serves as a yoke. It is an object of the present invention to provide a seal structure for a casing of a rotating machine in which the occurrence of a problem does not occur.

[0006]

According to the present invention, a tubular spigot portion is formed at the opening end side of a front bracket so as to be fitted into an opening of a casing, and a yoke is also used as an outer peripheral surface of the spigot portion. A casing sealing structure in which a sealing member is mounted between an outer peripheral side of the spigot portion and a root portion and an opening end side of the casing while fitting the opening side of the casing into the casing. A notch is formed by notching a part of the front bracket, and a groove that is continuous with the notch and extends in the axial direction is formed on an inner peripheral surface of the front bracket, and the casing and the front joined by the spigot portion are formed. An insulation plate formed so as to extend radially in a projection corresponding to the notch across the joint with the bracket; Relates sealing structure of a casing of the rotating machine, characterized in that the outer peripheral side leading end portion of the brush holder which is held in Tsu-up side and to be inserted in the groove.

[0007]

Accordingly, the outer peripheral end of the brush holder held on the insulating plate is inserted into a groove extending in the axial direction, which is continuous with the notch formed by cutting out a part of the spigot portion of the front bracket. In this state, the insulating plate is held so as to cross the joint between the casing and the front bracket. The joint between the front bracket and the yoke is sealed by a seal member mounted between the spigot and the protrusion of the insulating plate and the opening end of the casing.

[0008]

FIG. 4 shows the entire structure of a DC motor according to an embodiment of the present invention, in which a casing 15 and a front bracket 16 which also serve as a yoke made of a magnetic steel plate.
Thus, an outer casing of the motor is formed. The casing 15 also serving as a yoke is adapted to be fitted on the outer peripheral surface of a spigot portion 17 formed at the opening edge of the upper end of the front bracket 16, and the front flange portion of the casing 15 is attached to the front bracket 16. 16 steps 18
An O-ring 19 interposed on the opening end side of the casing 15 is located at the root of the spigot portion 17 of the front bracket 16 to seal the joint. Also the casing 15
A cylindrical magnet 2 is provided on the inner peripheral surface of the yoke composed of
0 is fixed.

A rotor 23 is disposed in the casing 15, and is rotatably supported by a pair of upper and lower bearings 24 and 25. A ring 26 is provided above the bearing 25.
Is arranged. A pump chamber 27 having a concave portion is formed below the front bracket 16. Seal rings 28 and 29 for sealing between the recess 27 and the bearing 25 are provided. A vane 30 is fixed to a portion on the tip side of the rotor 23, and a lower opening of the pump chamber 27 is closed by a closing plate 31.

An insulating plate 34 is disposed so as to cross the joint between the casing 15 and the front bracket 16. A brush holder 35 is attached to the lower surface of the insulating plate 34 as shown in FIGS. The brush 36 is slidably held by these brush holders 35. A commutator 37 is attached to the rotor 23 so as to be in sliding contact with the brush 36. The commutator 37 and the brush 36 switch the current to the coil of the rotor 23.

A pair of notches 40 are formed in the spigot portion 17 of the front bracket 16 at positions shifted from each other in the circumferential direction by 180 degrees.
A groove 41 is formed in the inner peripheral surface of the front bracket 16 so as to be continuous with the axial direction so as to be continuous. A pair of protrusions 42 are formed on the insulating plate 34 at positions shifted from each other by 180 degrees in the circumferential direction.
The outer peripheral end of the brush holder held on the front bracket 4 is housed in the groove 41 of the front bracket 16.

In the above configuration, the rotor 2 is connected via the brush 36 and the commutator 37 in the brush holder 35.
When the current passes through the coil of
5 is linked with the magnetic flux of the magnet 20 attached to
Thus, the rotor 23 is driven to rotate.
This rotation is transmitted to the vane 30 in the pump chamber 27 through the rotation shaft, and the vane 30 is rotated in the pump chamber 27. In this way, the vane pump directly connected to the DC motor is driven.

Further, in the DC motor according to the present embodiment, as shown in FIGS. 1 to 3, a pair of notches 40 are formed at positions 180 ° shifted from the spigot portion 17 of the front bracket 16, and A groove 41 that is continuous with the notch 40 is formed on the inner peripheral surface of the front bracket 16 along the vertical direction. And spigot part 1
The O-ring 19 is held on the outer peripheral surface of the casing 7, and the O-ring 19 is brought into contact with the opening end of the casing 15 so as to have waterproofness.

In addition, since the brush holder 35 containing the brush 36 is attached to the lower side of the insulating plate 34, and the brush holder 35 is contained in the groove 41 of the front bracket 16, miniaturization is possible. , And in particular, it is possible to reduce the dimension in the radial direction. Therefore, such a structure is used for the commutator 37 and the brush holder 3.
It is possible to reduce the size of the motor while keeping the waterproof structure for the size of 5.

[0015]

As described above, according to the present invention, a notch is formed by notching a part of the spigot portion, and a groove which is continuous with the notch and extends in the axial direction is formed on the inner peripheral surface of the front bracket. A cross section of the casing and the front bracket joined by the spigot portion is traversed through the joint corresponding to the notch, and is formed on the insulating plate formed to extend in the radial direction, and is held on the front bracket side. The outer peripheral end of the brush holder is inserted into the groove. Therefore, according to such a configuration, it is possible to reduce the dimension in the radial direction by at least an amount corresponding to the thickness of the spigot portion. Therefore, this makes it possible to reduce the diameter of the rotating machine in the diameter direction. Further, the joint between the front bracket and the casing can be sealed by a seal member interposed between the root portion of the spigot portion and the opening end of the casing. Since the protrusion corresponding to the cutout of the spigot portion is formed on the insulating plate so as to protrude in the radial direction, the cutout portion of the spigot portion is located between the protrusion of the insulating plate and the opening end of the casing. Therefore, even if a notch or a groove is formed in the front bracket, the waterproof performance does not decrease. Also, since the outer peripheral end of the brush holder held on the insulating plate is inserted into a groove continuous with the notch of the front bracket, the brush held by the brush holder and the commutator are Rotational force due to friction generated between the brush holder and the groove can be received by the engagement between the brush holder and the groove, so that the rotation of the insulating plate can be shared by the brush holder and the groove. Further, as described above, the brush holder is held on the front bracket side on the insulating plate arranged across the joint between the casing and the front bracket, so that the brush holder is Since the brush holder is located on the opposite side to the yoke, the brush holder is prevented from contacting the yoke, and a short circuit accident is avoided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a seal structure of a casing according to one embodiment of the present invention.

FIG. 2 is a plan view showing a state where a casing 15 also serving as a yoke is removed.

FIG. 3 is a longitudinal sectional view showing a joint between a casing 15 and a front bracket 16;

FIG. 4 is a sectional view showing the entire structure.

FIG. 5 is a plan view of a front bracket of a conventional DC motor.

FIG. 6 is a longitudinal sectional view showing the structure of a joint between the front bracket and the casing.

[Explanation of symbols]

 Reference Signs List 15 casing 16 front bracket 17 spigot part 18 step part 19 O-ring 20 magnet 23 rotor 24, 25 bearing 26 ring 27 pump chamber 28, 29 seal ring 30 vane 31 closing plate 34 insulating plate 35 brush holder 36 brush 37 commutator 40 Notch 41 Groove 42 Projection

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 5/10 H02K 5/15 H02K 23/00

Claims (1)

(57) [Claims] 1. A tubular spigot portion is formed at the opening end side of a front bracket so as to be fitted into an opening of a casing, and an outer peripheral surface of the spigot portion is fitted to an opening side of the casing which also serves as a yoke. And a casing sealing structure in which a sealing member is mounted between a root portion and an opening end side of the casing on an outer peripheral side of the spigot portion, wherein a part of the spigot portion is cut away. And a groove continuous with the notch and extending in the axial direction is formed on the inner peripheral surface of the front bracket, and the groove traverses a joint between the casing and the front bracket joined by the spigot portion. The protrusion corresponding to the notch is held on the front bracket side on an insulating plate formed so as to extend in the radial direction. Seal structure of the rotating machine casing, characterized in that the outer peripheral side leading end portion of the Rashihoruda was to insert in the groove.