JPS638702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flattened electric fan for a vehicle.

[Background of the invention]

BACKGROUND ART In recent years, as space inside vehicles has decreased, electric fans used for cooling vehicle radiators and heating and cooling systems have been required to be smaller, flatter, and lighter.

[Problems to be Solved by the Present Invention] The present invention aims to provide an electric fan that uses a coreless motor having a coreless armature as an electric motor in order to reduce the size and weight, and which can be made smaller and flatter as a whole. purpose.

[Configuration of the present invention]

For this reason, the present invention has a cup-type coreless motor having a shallow cup-shaped coreless armature 13, thereby reducing the weight and at least a part of the fan 29 covering the outer periphery of the coreless armature 13. The side wall of the fan 29 is coupled to the side wall (bottom of the cup) of the coreless armature 13 while overlapping the fan 29.

〔Example〕

An embodiment of the present invention will be described below. 1st
The figure shows a first embodiment of the invention. 1 is a magnet in which four or more magnetic poles are formed at equal intervals in the circumferential direction, and the number usually corresponds to the number of poles (in the figure, 4 or more poles are formed at equal intervals).
It consists of arc-shaped ferrite magnets. The magnet 1 is fixed by adhesive or the like to the outer peripheral surface of a cylindrical inner yoke 2 made of a soft iron plate such as SPCC. A cylindrical center piece 3 made of aluminum die-casting or resin molding is provided on the inner diameter side of the inner yoke 2, and this center piece 3 has bearing parts 4a and 4b in the center for rotatably holding the shaft 14. Further, two brush holder portions 7 extending in the axial direction are provided slightly on the outer peripheral side of the bearing portion 4a at an interval of 90 degrees. 8 and 9 are brushes and brush springs housed in the brush holder section 7. There are several (three in the figure) protrusions 11 on the side opposite to the brush 8 sliding surface of the center piece 3.
The center piece 3 is fixed to the motor bracket 12 by press-fitting a snap washer 10 into the protrusion 11. Note that screws may be used instead of the protrusions 11. 13 is a shallow cup-shaped coreless armature, which is made by molding an armature coil with heat-resistant resin and has a shaft 14 in the center of the cup, and a planar commutator 16 is molded on the inner surface of the bottom wall 15a of the cup. The tip of the brush 8 mentioned above is configured to slide on this commutator 16. The cylindrical outer circumferential wall 15b of the cup is arranged to face the outer circumferential surface of the magnet 1 via an air gap. Further, on the outer surface of the bottom wall 15a of the cup, there are a plurality of (four in the figure) projections 1 for attaching a rotated body.
7 is integrally formed. 18 is an oil cutter provided on the end face of the bearing portion 4a, and 19 is a thrust stopper circlip fixed to the end face of the shaft 14. Reference numeral 20 denotes a cylindrical external yoke made of a soft iron plate such as SPCE, which is fixed to the bracket 12, and its outer peripheral surface faces the outer peripheral wall 15b of the cup via an air gap. It constitutes a magnetic circuit. 27
There are several pieces on the outer circumference of the bracket 12 (three pieces in the figure).
The formed mounting hole is used to attach the motor to the case of an air-conditioning device, etc. 28 is a power cord for applying power supply voltage to the brush 8.

Next, the operation of the above configuration will be explained.
When a power supply voltage is applied to the power cord 28 from the power supply, this voltage is transmitted to the armature coil via the brush 8 and the commutator 16, and the armature 13 is rotated. Here, since the fan 29 is fixed as a rotated body by the protrusion 17, the armature 1
3, the fan 29 rotates, and as the fan 29 rotates, negative pressure is created on the outer wall side of the armature 13, and air flows through the ventilation hole 25, the hollow part 24, the inner peripheral surface of the cup, and the outer peripheral surface of the cup. As a result, the armature 13 can be cooled by this air flow. Further, the heat generated in the armature 13 is also dissipated through a fan 29 directly connected to the armature 13.

Note that 30 is a snap washer that is press-fitted into the projection 17 to connect the blower fan 29 to the armature 13. This blower 29 is connected to a snap washer 30 and a protrusion 1.
Instead of using 7, screw tightening may be used.

FIG. 2 shows a second embodiment of the present invention, in which a propeller fan 29 as a rotating body is connected to the armature 13, and this fan 29 is arranged opposite to the outer peripheral surface of the external yoke 20 via an air gap. A labyrinth ring 33 having a U-shaped cross section fixed to the outer peripheral surface of the external yoke 20 is disposed between the boss part 32 and the external yoke 20. The labyrinth ring 33 provides a waterproof function to the inside of the motor.

〔Effect of the invention〕

As described above, in the present invention, the side wall of the fan is connected to the side wall of the coreless armature, and at least a part of the fan is provided so as to cover the outer circumference of the coreless armature. This has the effect that heat is radiated through the rotating fan, and a small, flat electric fan with a small axial dimension can be obtained. In addition, since the flat part (side wall) of the fan and the flat part (side wall) of the coreless armature are connected, a strong connection can be achieved, no harmful vibrations are generated, and low-noise operation is possible.

In addition, since the cup-type coreless motor can have a smaller radial dimension than a normal disc-type coreless motor, this characteristic can be used to infiltrate into the fan 29, that is, a part of the fan 29. can be provided so as to cover the outer periphery of the coreless armature 13, and it is possible to achieve miniaturization as much as possible in both the axial and radial directions.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show the first and second embodiments of the present invention.
It is a sectional view showing an example. 1... Field part, 12... Motor bracket, 1
3...coreless armature, 14...shaft,
29... Juan, 17... Protrusion.

Claims (1)

[Scope of Claims] 1. A shallow cup-shaped coreless armature 13 on which a shaft 14 is pivotally supported, which is rotatably located in the center of the motor bracket 12; Field section 1 that generates magnetic flux interlinking with the armature 13 and is housed in the coreless armature 13
and a cup-type coreless motor, and a side wall of a fan 29 is coupled to a side wall of the coreless armature 13 such that at least a portion of the outer circumference of the coreless armature 13 of the cup-type coreless motor is covered. Features electric fan. 2. A protrusion 17 protruding in the axial direction of the shaft 14 is provided on the side wall of the coreless armature 13,
The electric fan according to claim 1, wherein the protrusion 17 is inserted into a hole formed in a side wall of the fan 29 and coupled thereto.