JP2510558Y2 - Thin electric fan - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a thin electric fan used for cooling a radiator such as an automobile or a truck.

[Problems to be Solved by Prior Art and Invention]

Generally, such an electric fan is required to be thin, but conventionally, in this kind of electric fan, a fan boss portion is formed into a double cylindrical shape as in, for example, Japanese Utility Model Publication No. 55-52080. Extend so that it is located on the outer circumference of the yoke and on the outer circumference of the small-diameter protrusion that protrudes forward from the motor yoke, and double-covers the exposed portion of the motor shaft to allow water to enter the motor shaft. I was trying to prevent. However, this one requires a small-diameter protrusion that protrudes forward from the front surface of the yoke, so the motor overall length cannot be increased and the thickness cannot be reduced, and as a result, the mounting space is reduced. It has the drawback of being particularly limited. Therefore, as shown in FIG. 3, the front portion of the motor yoke is
The overall length of the motor is shortened as a substantially flat type without a small-diameter protrusion, and as for waterproofness, a waterproof ring 15 is provided on the front surface of the yoke 7, and the waterproof ring 15 is attached to the ribs 3g and 3h provided on the fan boss 3a. However, in this case, the waterproof ring must be fixed to the front surface of the flat yoke by a fixing means such as spot welding or riveting, which is inferior in workability. However, unless the waterproofness of the fixing portion is ensured, there is a problem that water will intrude from here, which requires further improvement.

[Means for Solving the Problems]

The present invention was devised in view of the above circumstances to provide a thin electric fan capable of eliminating these drawbacks, and includes an armature core around which an armature coil is wound and a yoke. A permanent magnet fixed to the peripheral surface so as to face the armature core,
The front side is the bottom of the cylinder and the interior of the armature core is attached.
Further, in a thin electric fan configured to include a yoke that rotatably supports a core shaft of an armature core on a bottom surface of the cylinder via a bearing, and a fan integrally attached to the core shaft, the armature core may be an armature. While the portion of the your coil that projects axially forward from the armature core is wound so as to radially overlap the bearing with a gap in the outer radial direction,
Of the yoke cylinder bottom surface parts, the inner cylinder outer diameter cylinder bottom surface parts that face the bearing and the armature coil in the axial direction, respectively, are left, and the intermediate cylinder bottom surface part between them is
The front side facing the fan is formed as a concave portion that is concave in a concave groove ring state with the core axis as the axial center, and the front side space of the concave portion is arranged in the radial direction with respect to the front protruding portion of the bearing and the armature coil. With the arrangement configuration that overlaps with
On the rear surface of the fan boss portion, at least a cylindrical auxiliary rib that is recessed into the front side space portion of the concave portion and forms a labyrinth waterproof structure with the front concave groove surface of the concave portion is provided. It is characterized by that. With this configuration, the present invention enables the motor to be thin without a small-diameter protrusion,
The waterproof ring can be easily attached and the waterproof ring can be made extremely excellent.

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a radiator that is mounted on a vehicle such as an automobile and that cools engine cooling water. A thin electric fan 2 for cooling the radiator 1 is arranged on the back surface of the radiator 1, and a shroud 5 is provided. Through radiator 1
It is fixed to the side. The electric fan 2 includes a fan 3 and a motor 4 for rotating the fan 3. A permanent magnet M is formed on the inner peripheral surface of the cylindrical portion of the bottomed cylindrical yoke (front bracket) 7 that constitutes the motor 4.
Has been fixed. The armature core (rotor) 10 is provided at the axial center of the cylinder bottom 7a formed on the front side of the yoke 7.
The core shaft (motor shaft) 8 is rotatably supported via the bearing 9. The armature core 10 has a portion of the armature coil 10a that protrudes axially forward from the armature core 10 relative to the bearing 9. And is wound so as to overlap in the radial direction with a gap being provided in the outer radial direction. Then, of the yoke cylinder bottom surface portion 7a that closely faces the armature coil 10a, the outer diameter side surface portion 7d that faces the armature coil 10a and the inner diameter side surface portion 7e that faces the bearing 9 are left as they are, The armature coil 10a
The intermediate cylinder bottom face portion facing the gap between the bearing 9 and the bearing 9 is recessed toward the motor rear face side so as to be recessed in the gap in the concave groove ring state so that the core shaft 8 becomes the core portion.
And the inner diameter side 7c forming the concave portion 7b so as to overlap the inner diameter side of the concave portion 7b.
The outer ring of the bearing 9 is fitted on the inner peripheral surface of the bearing 9, and the remaining inner diameter side surface portion 7e is used to prevent the bearing 9 from slipping forward. It is becoming like this. In the figure, 11 is a brush, 12 is a commutator, 13 is a brush holder,
Reference numeral 14 is a brush pressing ammunition machine, and 15 is a waterproof ring which is press-fitted onto the outer peripheral surface of the inner side 7c of the recess. On the other hand, the fan 3 has a plurality of blades 3b radially protruding from the outer peripheral edge of the boss 3a.
Triple cylindrical auxiliary ribs 3c, 3d, 3e are provided on the side of the boss 3a on the side of the motor 4 so as to face the rear side of the motor. The outer auxiliary rib 3c extends over the outer circumference of the yoke 7 to a position close to the rear bracket 17 and is fitted loosely on the outer circumference of the yoke 7. The intermediate auxiliary rib 3d is a front plate.
The outer ribs 7a of 7a are closely opposed to the outer side surface 7d, and the innermost auxiliary rib (corresponding to the "auxiliary rib" of the present invention) 3e extends to the inside of the concave groove of the concave portion 7b. It is configured to be extended to be immersed, and the front plate 7a is on the outer diameter side.
On the inner diameter side, the inner side of the recess 7c and the waterproof ring
It is configured to wrap up with 15. Reference numeral 18 is a nut for fixing the fan to the core shaft 8, and 3f is an auxiliary rib radially formed from the outer peripheral surface of the inner auxiliary ribs 3c, 3d, 3e. In the embodiment of the present invention constructed as described above, the fan 3 is rotated by the driving of the motor 4 and the radiator is cooled by the wind action, but the electric fan 2 is provided with the fan boss portion 3a and the motor. The labyrinth structure formed between the yoke 7 and the yoke 7 can reliably prevent water from entering the core shaft 8 side. That is, when the water tries to enter the electric fan 2, the water is absorbed between the outer rib 3 and the middle auxiliary rib 3
Although the water will pass through two levels of waterproofing by c and 3d, the water that has passed therethrough will sunk into the concave groove of the concave portion 7b formed on the bottom surface 7a of the yoke cylinder by the auxiliary rib 3e on the inside. Further, since the labyrinth structure is formed so as to overlap radially inside and outside in the retaining support portion of the bearing 9, it is possible to reliably prevent the water that is about to enter into the core shaft side. In addition, the waterproof action is further improved by the presence of the waterproof ring 15 that wraps on the inner side 7c of the recessed portion on the inner diameter side. As described above, in the embodiment of the present invention, the concave portion 7b is formed in the front surface of the yoke 7, and the auxiliary rib 3e is extended from the fan boss portion 3a side into the concave groove of the concave portion 7b. With a simple structure, it is possible to provide a labyrinth waterproof structure in which the yoke 7 is trapped on both the inner and outer peripheral surface sides of the auxiliary rib 3e. Moreover, the recessed portion 7b is formed by the bearing 9 that axially supports the armature core 10 and the armature coil.
The arrangement is such that it is located between the front projection of 10a and overlaps in the radial direction. As a result, the bearing 9 required to pivotally support the front side of the armature core 10, the front side protrusion of the armature coil 10a that must be protruded from the armature core 10, and the recess 7b forming the waterproof structure. The installation space of the three can be secured in the same installation site in the axial direction, that is, in the thickness direction of the electric fan, and each of these spaces must be secured separately in the axial direction. On the other hand, it can be thinned accordingly. Moreover, the bearing 9 for bearing the core shaft 8 on the bottom surface 7a of the yoke cylinder is fitted and supported by the inner diameter side 7c formed by forming the recessed portion 7b, and the bearing 9 is prevented from slipping forward. Is performed by the inner diameter side surface portion 7e left without being immersed, and the bearing 9 has a bottom surface portion of the yoke cylinder which is radially overlapped with the concave portion forming the labyrinth waterproof structure.
It will be incorporated by effectively using 7a. As a result,
The portion where the bearing 9 is incorporated and the recessed portion 7b for forming the labyrinth waterproof portion are the core shaft 8 and the armature coil 10.
The inner and outer portions are arranged in the state of being radially overlapped with the gap between them and a, so that they can be made thin so that they do not largely protrude forward from the yoke cylinder bottom surface portion 7a. Also, as in the example, the waterproof ring is made by using the inner side 7c.
When press-fitting 15, it is not necessary to further protrude the yoke to form a small-diameter protruding portion, and the front surface portion of the yoke 7 can be made substantially flush with each other, and the motor can be made compact with a short overall length.

[Operation effect]

In summary, since the present invention is constructed as described above, the auxiliary ribs protruding from the fan boss portion side are recessed into the groove of the concave portion formed on the bottom surface of the cylinder on the front surface of the yoke, and the labyrinth waterproofing is achieved. It has a structure and is highly waterproof. Moreover, the recessed portion is located between the bearing that axially supports the armature core and the front projection of the armature coil in the axial direction, and is arranged to overlap with these in the radial direction. As a result, the bearing required to pivotally support the front side of the armature core, the front side protrusion of the armature coil protruding from the armature core, and the recessed portion for forming the labyrinth waterproof structure are three, Since it is located in the same location in the axial direction, that is, in the thickness direction of the electric fan, it is not necessary to separately secure each of these placement spaces in the axial direction. Can be thin.

[Brief description of drawings]

FIG. 1 shows an embodiment of a thin electric fan according to the present invention. FIG. 1 is an overall side view of FIG. 1, FIG. 2 is a side view of essential parts, and FIG. 3 is a side view of essential parts of a conventional example. is there. In the figure, 2 is an electric fan, 3 is a fan, 3c, 3d and 3e are auxiliary ribs, 4 is a motor, 7 is a yoke, 7a is a front surface of the yoke, 7b.
Is a concave portion, 7c is an inner diameter side, 7d is an outer diameter side surface portion, 7e is an inner diameter side surface portion, 8 is a core shaft, 9 is a bearing, 10 is an armature core,
10a is an armature coil, and 15 is a waterproof ring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography SHO55-106449 (JP, U) ACTIVITIAL SHO 56-2752 (JP, U) ACTUAL OPEN 52-18405 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. An armature core around which an armature coil is wound, a permanent magnet fixed to the inner peripheral surface of the yoke so as to face the armature core, a front side of which is a bottom surface of the cylinder, and the armature core is internally mounted. In a thin electric fan including a yoke that rotatably supports a core shaft of an armature core through a bearing on a bottom surface of the cylinder, and a fan integrally attached to the core shaft, the armature core may be the armature core. The portion of the coil that projects axially forward from the armature core is wound so as to radially overlap the bearing with a gap in the outer diameter direction. And the inner and outer diameter side cylinder bottom faces axially facing the armature coil, respectively, are left between them. The bottom surface of the intermediate cylinder is formed as a recessed portion in which the front side facing the fan is recessed in a recessed groove ring state with the core axis as the axis, and the front side space of the recessed portion projects the front side of the bearing and the armature coil. And a labyrinth waterproof structure between the rear surface of the fan boss portion and the front concave groove surface of the concave portion which is recessed into the front side space portion of the concave portion. A thin electric fan, characterized in that at least a cylindrical auxiliary rib forming the above is provided in a protruding manner.